xref: /freebsd/contrib/unbound/iterator/iterator.c (revision 8f76bb7dad48538c6832c2fb466a433d2a3f8cd5)
1b7579f77SDag-Erling Smørgrav /*
2b7579f77SDag-Erling Smørgrav  * iterator/iterator.c - iterative resolver DNS query response module
3b7579f77SDag-Erling Smørgrav  *
4b7579f77SDag-Erling Smørgrav  * Copyright (c) 2007, NLnet Labs. All rights reserved.
5b7579f77SDag-Erling Smørgrav  *
6b7579f77SDag-Erling Smørgrav  * This software is open source.
7b7579f77SDag-Erling Smørgrav  *
8b7579f77SDag-Erling Smørgrav  * Redistribution and use in source and binary forms, with or without
9b7579f77SDag-Erling Smørgrav  * modification, are permitted provided that the following conditions
10b7579f77SDag-Erling Smørgrav  * are met:
11b7579f77SDag-Erling Smørgrav  *
12b7579f77SDag-Erling Smørgrav  * Redistributions of source code must retain the above copyright notice,
13b7579f77SDag-Erling Smørgrav  * this list of conditions and the following disclaimer.
14b7579f77SDag-Erling Smørgrav  *
15b7579f77SDag-Erling Smørgrav  * Redistributions in binary form must reproduce the above copyright notice,
16b7579f77SDag-Erling Smørgrav  * this list of conditions and the following disclaimer in the documentation
17b7579f77SDag-Erling Smørgrav  * and/or other materials provided with the distribution.
18b7579f77SDag-Erling Smørgrav  *
19b7579f77SDag-Erling Smørgrav  * Neither the name of the NLNET LABS nor the names of its contributors may
20b7579f77SDag-Erling Smørgrav  * be used to endorse or promote products derived from this software without
21b7579f77SDag-Erling Smørgrav  * specific prior written permission.
22b7579f77SDag-Erling Smørgrav  *
23b7579f77SDag-Erling Smørgrav  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
2417d15b25SDag-Erling Smørgrav  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
2517d15b25SDag-Erling Smørgrav  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
2617d15b25SDag-Erling Smørgrav  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
2717d15b25SDag-Erling Smørgrav  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
2817d15b25SDag-Erling Smørgrav  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
2917d15b25SDag-Erling Smørgrav  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
3017d15b25SDag-Erling Smørgrav  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
3117d15b25SDag-Erling Smørgrav  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
3217d15b25SDag-Erling Smørgrav  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
3317d15b25SDag-Erling Smørgrav  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34b7579f77SDag-Erling Smørgrav  */
35b7579f77SDag-Erling Smørgrav 
36b7579f77SDag-Erling Smørgrav /**
37b7579f77SDag-Erling Smørgrav  * \file
38b7579f77SDag-Erling Smørgrav  *
398a384985SDag-Erling Smørgrav  * This file contains a module that performs recursive iterative DNS query
40b7579f77SDag-Erling Smørgrav  * processing.
41b7579f77SDag-Erling Smørgrav  */
42b7579f77SDag-Erling Smørgrav 
43b7579f77SDag-Erling Smørgrav #include "config.h"
44b7579f77SDag-Erling Smørgrav #include "iterator/iterator.h"
45b7579f77SDag-Erling Smørgrav #include "iterator/iter_utils.h"
46b7579f77SDag-Erling Smørgrav #include "iterator/iter_hints.h"
47b7579f77SDag-Erling Smørgrav #include "iterator/iter_fwd.h"
48b7579f77SDag-Erling Smørgrav #include "iterator/iter_donotq.h"
49b7579f77SDag-Erling Smørgrav #include "iterator/iter_delegpt.h"
50b7579f77SDag-Erling Smørgrav #include "iterator/iter_resptype.h"
51b7579f77SDag-Erling Smørgrav #include "iterator/iter_scrub.h"
52b7579f77SDag-Erling Smørgrav #include "iterator/iter_priv.h"
53b7579f77SDag-Erling Smørgrav #include "validator/val_neg.h"
54b7579f77SDag-Erling Smørgrav #include "services/cache/dns.h"
55b7579f77SDag-Erling Smørgrav #include "services/cache/infra.h"
5657bddd21SDag-Erling Smørgrav #include "services/authzone.h"
57b7579f77SDag-Erling Smørgrav #include "util/module.h"
58b7579f77SDag-Erling Smørgrav #include "util/netevent.h"
59b7579f77SDag-Erling Smørgrav #include "util/net_help.h"
60b7579f77SDag-Erling Smørgrav #include "util/regional.h"
61b7579f77SDag-Erling Smørgrav #include "util/data/dname.h"
62b7579f77SDag-Erling Smørgrav #include "util/data/msgencode.h"
63b7579f77SDag-Erling Smørgrav #include "util/fptr_wlist.h"
64b7579f77SDag-Erling Smørgrav #include "util/config_file.h"
6509a3aaf3SDag-Erling Smørgrav #include "util/random.h"
6609a3aaf3SDag-Erling Smørgrav #include "sldns/rrdef.h"
6709a3aaf3SDag-Erling Smørgrav #include "sldns/wire2str.h"
6805ab2901SDag-Erling Smørgrav #include "sldns/str2wire.h"
6909a3aaf3SDag-Erling Smørgrav #include "sldns/parseutil.h"
7009a3aaf3SDag-Erling Smørgrav #include "sldns/sbuffer.h"
71b7579f77SDag-Erling Smørgrav 
72e86b9096SDag-Erling Smørgrav /* in msec */
73e86b9096SDag-Erling Smørgrav int UNKNOWN_SERVER_NICENESS = 376;
74790c6b24SCy Schubert /* in msec */
75790c6b24SCy Schubert int USEFUL_SERVER_TOP_TIMEOUT = 120000;
76790c6b24SCy Schubert /* Equals USEFUL_SERVER_TOP_TIMEOUT*4 */
77790c6b24SCy Schubert int BLACKLIST_PENALTY = (120000*4);
78e86b9096SDag-Erling Smørgrav 
79091e9e46SCy Schubert static void target_count_increase_nx(struct iter_qstate* iq, int num);
80091e9e46SCy Schubert 
81b7579f77SDag-Erling Smørgrav int
82b7579f77SDag-Erling Smørgrav iter_init(struct module_env* env, int id)
83b7579f77SDag-Erling Smørgrav {
84b7579f77SDag-Erling Smørgrav 	struct iter_env* iter_env = (struct iter_env*)calloc(1,
85b7579f77SDag-Erling Smørgrav 		sizeof(struct iter_env));
86b7579f77SDag-Erling Smørgrav 	if(!iter_env) {
87b7579f77SDag-Erling Smørgrav 		log_err("malloc failure");
88b7579f77SDag-Erling Smørgrav 		return 0;
89b7579f77SDag-Erling Smørgrav 	}
90b7579f77SDag-Erling Smørgrav 	env->modinfo[id] = (void*)iter_env;
91971980c3SDag-Erling Smørgrav 
92971980c3SDag-Erling Smørgrav 	lock_basic_init(&iter_env->queries_ratelimit_lock);
93971980c3SDag-Erling Smørgrav 	lock_protect(&iter_env->queries_ratelimit_lock,
94971980c3SDag-Erling Smørgrav 			&iter_env->num_queries_ratelimited,
95971980c3SDag-Erling Smørgrav 		sizeof(iter_env->num_queries_ratelimited));
96971980c3SDag-Erling Smørgrav 
97b7579f77SDag-Erling Smørgrav 	if(!iter_apply_cfg(iter_env, env->cfg)) {
98b7579f77SDag-Erling Smørgrav 		log_err("iterator: could not apply configuration settings.");
99b7579f77SDag-Erling Smørgrav 		return 0;
100b7579f77SDag-Erling Smørgrav 	}
10105ab2901SDag-Erling Smørgrav 
102b7579f77SDag-Erling Smørgrav 	return 1;
103b7579f77SDag-Erling Smørgrav }
104b7579f77SDag-Erling Smørgrav 
10509a3aaf3SDag-Erling Smørgrav /** delete caps_whitelist element */
10609a3aaf3SDag-Erling Smørgrav static void
1073005e0a3SDag-Erling Smørgrav caps_free(struct rbnode_type* n, void* ATTR_UNUSED(d))
10809a3aaf3SDag-Erling Smørgrav {
10909a3aaf3SDag-Erling Smørgrav 	if(n) {
11009a3aaf3SDag-Erling Smørgrav 		free(((struct name_tree_node*)n)->name);
11109a3aaf3SDag-Erling Smørgrav 		free(n);
11209a3aaf3SDag-Erling Smørgrav 	}
11309a3aaf3SDag-Erling Smørgrav }
11409a3aaf3SDag-Erling Smørgrav 
115b7579f77SDag-Erling Smørgrav void
116b7579f77SDag-Erling Smørgrav iter_deinit(struct module_env* env, int id)
117b7579f77SDag-Erling Smørgrav {
118b7579f77SDag-Erling Smørgrav 	struct iter_env* iter_env;
119b7579f77SDag-Erling Smørgrav 	if(!env || !env->modinfo[id])
120b7579f77SDag-Erling Smørgrav 		return;
121b7579f77SDag-Erling Smørgrav 	iter_env = (struct iter_env*)env->modinfo[id];
122971980c3SDag-Erling Smørgrav 	lock_basic_destroy(&iter_env->queries_ratelimit_lock);
123b7579f77SDag-Erling Smørgrav 	free(iter_env->target_fetch_policy);
124b7579f77SDag-Erling Smørgrav 	priv_delete(iter_env->priv);
125b7579f77SDag-Erling Smørgrav 	donotq_delete(iter_env->donotq);
12609a3aaf3SDag-Erling Smørgrav 	if(iter_env->caps_white) {
12709a3aaf3SDag-Erling Smørgrav 		traverse_postorder(iter_env->caps_white, caps_free, NULL);
12809a3aaf3SDag-Erling Smørgrav 		free(iter_env->caps_white);
12909a3aaf3SDag-Erling Smørgrav 	}
130b7579f77SDag-Erling Smørgrav 	free(iter_env);
131b7579f77SDag-Erling Smørgrav 	env->modinfo[id] = NULL;
132b7579f77SDag-Erling Smørgrav }
133b7579f77SDag-Erling Smørgrav 
134b7579f77SDag-Erling Smørgrav /** new query for iterator */
135b7579f77SDag-Erling Smørgrav static int
136b7579f77SDag-Erling Smørgrav iter_new(struct module_qstate* qstate, int id)
137b7579f77SDag-Erling Smørgrav {
138b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)regional_alloc(
139b7579f77SDag-Erling Smørgrav 		qstate->region, sizeof(struct iter_qstate));
140b7579f77SDag-Erling Smørgrav 	qstate->minfo[id] = iq;
141b7579f77SDag-Erling Smørgrav 	if(!iq)
142b7579f77SDag-Erling Smørgrav 		return 0;
143b7579f77SDag-Erling Smørgrav 	memset(iq, 0, sizeof(*iq));
144b7579f77SDag-Erling Smørgrav 	iq->state = INIT_REQUEST_STATE;
145b7579f77SDag-Erling Smørgrav 	iq->final_state = FINISHED_STATE;
146b7579f77SDag-Erling Smørgrav 	iq->an_prepend_list = NULL;
147b7579f77SDag-Erling Smørgrav 	iq->an_prepend_last = NULL;
148b7579f77SDag-Erling Smørgrav 	iq->ns_prepend_list = NULL;
149b7579f77SDag-Erling Smørgrav 	iq->ns_prepend_last = NULL;
150b7579f77SDag-Erling Smørgrav 	iq->dp = NULL;
151b7579f77SDag-Erling Smørgrav 	iq->depth = 0;
152b7579f77SDag-Erling Smørgrav 	iq->num_target_queries = 0;
153b7579f77SDag-Erling Smørgrav 	iq->num_current_queries = 0;
154b7579f77SDag-Erling Smørgrav 	iq->query_restart_count = 0;
155b7579f77SDag-Erling Smørgrav 	iq->referral_count = 0;
156b7579f77SDag-Erling Smørgrav 	iq->sent_count = 0;
15709a3aaf3SDag-Erling Smørgrav 	iq->ratelimit_ok = 0;
15852df462fSXin LI 	iq->target_count = NULL;
159091e9e46SCy Schubert 	iq->dp_target_count = 0;
160b7579f77SDag-Erling Smørgrav 	iq->wait_priming_stub = 0;
161b7579f77SDag-Erling Smørgrav 	iq->refetch_glue = 0;
162b7579f77SDag-Erling Smørgrav 	iq->dnssec_expected = 0;
163b7579f77SDag-Erling Smørgrav 	iq->dnssec_lame_query = 0;
164b7579f77SDag-Erling Smørgrav 	iq->chase_flags = qstate->query_flags;
165b7579f77SDag-Erling Smørgrav 	/* Start with the (current) qname. */
166b7579f77SDag-Erling Smørgrav 	iq->qchase = qstate->qinfo;
167b7579f77SDag-Erling Smørgrav 	outbound_list_init(&iq->outlist);
168e2d15004SDag-Erling Smørgrav 	iq->minimise_count = 0;
16925039b37SCy Schubert 	iq->timeout_count = 0;
17005ab2901SDag-Erling Smørgrav 	if (qstate->env->cfg->qname_minimisation)
17105ab2901SDag-Erling Smørgrav 		iq->minimisation_state = INIT_MINIMISE_STATE;
17205ab2901SDag-Erling Smørgrav 	else
17305ab2901SDag-Erling Smørgrav 		iq->minimisation_state = DONOT_MINIMISE_STATE;
17405ab2901SDag-Erling Smørgrav 
17505ab2901SDag-Erling Smørgrav 	memset(&iq->qinfo_out, 0, sizeof(struct query_info));
176b7579f77SDag-Erling Smørgrav 	return 1;
177b7579f77SDag-Erling Smørgrav }
178b7579f77SDag-Erling Smørgrav 
179b7579f77SDag-Erling Smørgrav /**
180b7579f77SDag-Erling Smørgrav  * Transition to the next state. This can be used to advance a currently
181b7579f77SDag-Erling Smørgrav  * processing event. It cannot be used to reactivate a forEvent.
182b7579f77SDag-Erling Smørgrav  *
183b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state
184b7579f77SDag-Erling Smørgrav  * @param nextstate The state to transition to.
185b7579f77SDag-Erling Smørgrav  * @return true. This is so this can be called as the return value for the
186b7579f77SDag-Erling Smørgrav  *         actual process*State() methods. (Transitioning to the next state
187b7579f77SDag-Erling Smørgrav  *         implies further processing).
188b7579f77SDag-Erling Smørgrav  */
189b7579f77SDag-Erling Smørgrav static int
190b7579f77SDag-Erling Smørgrav next_state(struct iter_qstate* iq, enum iter_state nextstate)
191b7579f77SDag-Erling Smørgrav {
192b7579f77SDag-Erling Smørgrav 	/* If transitioning to a "response" state, make sure that there is a
193b7579f77SDag-Erling Smørgrav 	 * response */
194b7579f77SDag-Erling Smørgrav 	if(iter_state_is_responsestate(nextstate)) {
195b7579f77SDag-Erling Smørgrav 		if(iq->response == NULL) {
196b7579f77SDag-Erling Smørgrav 			log_err("transitioning to response state sans "
197b7579f77SDag-Erling Smørgrav 				"response.");
198b7579f77SDag-Erling Smørgrav 		}
199b7579f77SDag-Erling Smørgrav 	}
200b7579f77SDag-Erling Smørgrav 	iq->state = nextstate;
201b7579f77SDag-Erling Smørgrav 	return 1;
202b7579f77SDag-Erling Smørgrav }
203b7579f77SDag-Erling Smørgrav 
204b7579f77SDag-Erling Smørgrav /**
205b7579f77SDag-Erling Smørgrav  * Transition an event to its final state. Final states always either return
206b7579f77SDag-Erling Smørgrav  * a result up the module chain, or reactivate a dependent event. Which
20705ab2901SDag-Erling Smørgrav  * final state to transition to is set in the module state for the event when
208b7579f77SDag-Erling Smørgrav  * it was created, and depends on the original purpose of the event.
209b7579f77SDag-Erling Smørgrav  *
210b7579f77SDag-Erling Smørgrav  * The response is stored in the qstate->buf buffer.
211b7579f77SDag-Erling Smørgrav  *
212b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state
213b7579f77SDag-Erling Smørgrav  * @return false. This is so this method can be used as the return value for
214b7579f77SDag-Erling Smørgrav  *         the processState methods. (Transitioning to the final state
215b7579f77SDag-Erling Smørgrav  */
216b7579f77SDag-Erling Smørgrav static int
217b7579f77SDag-Erling Smørgrav final_state(struct iter_qstate* iq)
218b7579f77SDag-Erling Smørgrav {
219b7579f77SDag-Erling Smørgrav 	return next_state(iq, iq->final_state);
220b7579f77SDag-Erling Smørgrav }
221b7579f77SDag-Erling Smørgrav 
222b7579f77SDag-Erling Smørgrav /**
223b7579f77SDag-Erling Smørgrav  * Callback routine to handle errors in parent query states
224b7579f77SDag-Erling Smørgrav  * @param qstate: query state that failed.
225b7579f77SDag-Erling Smørgrav  * @param id: module id.
226b7579f77SDag-Erling Smørgrav  * @param super: super state.
227b7579f77SDag-Erling Smørgrav  */
228b7579f77SDag-Erling Smørgrav static void
229b7579f77SDag-Erling Smørgrav error_supers(struct module_qstate* qstate, int id, struct module_qstate* super)
230b7579f77SDag-Erling Smørgrav {
231091e9e46SCy Schubert 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
232b7579f77SDag-Erling Smørgrav 	struct iter_qstate* super_iq = (struct iter_qstate*)super->minfo[id];
233b7579f77SDag-Erling Smørgrav 
234b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_A ||
235b7579f77SDag-Erling Smørgrav 		qstate->qinfo.qtype == LDNS_RR_TYPE_AAAA) {
236b7579f77SDag-Erling Smørgrav 		/* mark address as failed. */
237b7579f77SDag-Erling Smørgrav 		struct delegpt_ns* dpns = NULL;
238b5663de9SDag-Erling Smørgrav 		super_iq->num_target_queries--;
239b7579f77SDag-Erling Smørgrav 		if(super_iq->dp)
240b7579f77SDag-Erling Smørgrav 			dpns = delegpt_find_ns(super_iq->dp,
241b7579f77SDag-Erling Smørgrav 				qstate->qinfo.qname, qstate->qinfo.qname_len);
242b7579f77SDag-Erling Smørgrav 		if(!dpns) {
243b7579f77SDag-Erling Smørgrav 			/* not interested */
2444c75e3aaSDag-Erling Smørgrav 			/* this can happen, for eg. qname minimisation asked
2454c75e3aaSDag-Erling Smørgrav 			 * for an NXDOMAIN to be validated, and used qtype
2464c75e3aaSDag-Erling Smørgrav 			 * A for that, and the error of that, the name, is
2474c75e3aaSDag-Erling Smørgrav 			 * not listed in super_iq->dp */
248b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "subq error, but not interested");
249b7579f77SDag-Erling Smørgrav 			log_query_info(VERB_ALGO, "superq", &super->qinfo);
250b7579f77SDag-Erling Smørgrav 			return;
251b7579f77SDag-Erling Smørgrav 		} else {
252b7579f77SDag-Erling Smørgrav 			/* see if the failure did get (parent-lame) info */
253bc892140SDag-Erling Smørgrav 			if(!cache_fill_missing(super->env, super_iq->qchase.qclass,
254bc892140SDag-Erling Smørgrav 				super->region, super_iq->dp))
255b7579f77SDag-Erling Smørgrav 				log_err("out of memory adding missing");
256b7579f77SDag-Erling Smørgrav 		}
257091e9e46SCy Schubert 		delegpt_mark_neg(dpns, qstate->qinfo.qtype);
258*8f76bb7dSCy Schubert 		if((dpns->got4 == 2 || (!ie->supports_ipv4 && !ie->use_nat64)) &&
2590a92a9fcSCy Schubert 			(dpns->got6 == 2 || !ie->supports_ipv6)) {
260865f46b2SCy Schubert 			dpns->resolved = 1; /* mark as failed */
261091e9e46SCy Schubert 			target_count_increase_nx(super_iq, 1);
262b7579f77SDag-Erling Smørgrav 		}
2630a92a9fcSCy Schubert 	}
264b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_NS) {
265b7579f77SDag-Erling Smørgrav 		/* prime failed to get delegation */
266b7579f77SDag-Erling Smørgrav 		super_iq->dp = NULL;
267b7579f77SDag-Erling Smørgrav 	}
268b7579f77SDag-Erling Smørgrav 	/* evaluate targets again */
269b7579f77SDag-Erling Smørgrav 	super_iq->state = QUERYTARGETS_STATE;
270b7579f77SDag-Erling Smørgrav 	/* super becomes runnable, and will process this change */
271b7579f77SDag-Erling Smørgrav }
272b7579f77SDag-Erling Smørgrav 
273b7579f77SDag-Erling Smørgrav /**
274b7579f77SDag-Erling Smørgrav  * Return an error to the client
275b7579f77SDag-Erling Smørgrav  * @param qstate: our query state
276b7579f77SDag-Erling Smørgrav  * @param id: module id
277b7579f77SDag-Erling Smørgrav  * @param rcode: error code (DNS errcode).
278b7579f77SDag-Erling Smørgrav  * @return: 0 for use by caller, to make notation easy, like:
279b7579f77SDag-Erling Smørgrav  * 	return error_response(..).
280b7579f77SDag-Erling Smørgrav  */
281b7579f77SDag-Erling Smørgrav static int
282b7579f77SDag-Erling Smørgrav error_response(struct module_qstate* qstate, int id, int rcode)
283b7579f77SDag-Erling Smørgrav {
284b7579f77SDag-Erling Smørgrav 	verbose(VERB_QUERY, "return error response %s",
28517d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rcodes, rcode)?
28617d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rcodes, rcode)->name:"??");
287b7579f77SDag-Erling Smørgrav 	qstate->return_rcode = rcode;
288b7579f77SDag-Erling Smørgrav 	qstate->return_msg = NULL;
289b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_finished;
290b7579f77SDag-Erling Smørgrav 	return 0;
291b7579f77SDag-Erling Smørgrav }
292b7579f77SDag-Erling Smørgrav 
293b7579f77SDag-Erling Smørgrav /**
294b7579f77SDag-Erling Smørgrav  * Return an error to the client and cache the error code in the
295b7579f77SDag-Erling Smørgrav  * message cache (so per qname, qtype, qclass).
296b7579f77SDag-Erling Smørgrav  * @param qstate: our query state
297b7579f77SDag-Erling Smørgrav  * @param id: module id
298b7579f77SDag-Erling Smørgrav  * @param rcode: error code (DNS errcode).
299b7579f77SDag-Erling Smørgrav  * @return: 0 for use by caller, to make notation easy, like:
300b7579f77SDag-Erling Smørgrav  * 	return error_response(..).
301b7579f77SDag-Erling Smørgrav  */
302b7579f77SDag-Erling Smørgrav static int
303b7579f77SDag-Erling Smørgrav error_response_cache(struct module_qstate* qstate, int id, int rcode)
304b7579f77SDag-Erling Smørgrav {
305b7579f77SDag-Erling Smørgrav 	struct reply_info err;
306*8f76bb7dSCy Schubert 	struct msgreply_entry* msg;
307*8f76bb7dSCy Schubert 	if(qstate->no_cache_store) {
308*8f76bb7dSCy Schubert 		return error_response(qstate, id, rcode);
309*8f76bb7dSCy Schubert 	}
310ff825849SDag-Erling Smørgrav 	if(qstate->prefetch_leeway > NORR_TTL) {
311ff825849SDag-Erling Smørgrav 		verbose(VERB_ALGO, "error response for prefetch in cache");
312ff825849SDag-Erling Smørgrav 		/* attempt to adjust the cache entry prefetch */
313ff825849SDag-Erling Smørgrav 		if(dns_cache_prefetch_adjust(qstate->env, &qstate->qinfo,
314ff825849SDag-Erling Smørgrav 			NORR_TTL, qstate->query_flags))
315ff825849SDag-Erling Smørgrav 			return error_response(qstate, id, rcode);
316ff825849SDag-Erling Smørgrav 		/* if that fails (not in cache), fall through to store err */
317ff825849SDag-Erling Smørgrav 	}
318c7f4d7adSDag-Erling Smørgrav 	if((msg=msg_cache_lookup(qstate->env,
319c7f4d7adSDag-Erling Smørgrav 		qstate->qinfo.qname, qstate->qinfo.qname_len,
320c7f4d7adSDag-Erling Smørgrav 		qstate->qinfo.qtype, qstate->qinfo.qclass,
3214c75e3aaSDag-Erling Smørgrav 		qstate->query_flags, 0,
322*8f76bb7dSCy Schubert 		qstate->env->cfg->serve_expired_ttl_reset)) != NULL) {
323*8f76bb7dSCy Schubert 		struct reply_info* rep = (struct reply_info*)msg->entry.data;
324*8f76bb7dSCy Schubert 		if(qstate->env->cfg->serve_expired &&
325*8f76bb7dSCy Schubert 			qstate->env->cfg->serve_expired_ttl_reset && rep &&
326*8f76bb7dSCy Schubert 			*qstate->env->now + qstate->env->cfg->serve_expired_ttl
327*8f76bb7dSCy Schubert 			> rep->serve_expired_ttl) {
328*8f76bb7dSCy Schubert 			verbose(VERB_ALGO, "reset serve-expired-ttl for "
329*8f76bb7dSCy Schubert 				"response in cache");
330*8f76bb7dSCy Schubert 			rep->serve_expired_ttl = *qstate->env->now +
3314c75e3aaSDag-Erling Smørgrav 				qstate->env->cfg->serve_expired_ttl;
3324c75e3aaSDag-Erling Smørgrav 		}
333*8f76bb7dSCy Schubert 		if(rep && (FLAGS_GET_RCODE(rep->flags) ==
334e86b9096SDag-Erling Smørgrav 			LDNS_RCODE_NOERROR ||
335e86b9096SDag-Erling Smørgrav 			FLAGS_GET_RCODE(rep->flags) ==
336*8f76bb7dSCy Schubert 			LDNS_RCODE_NXDOMAIN ||
337*8f76bb7dSCy Schubert 			FLAGS_GET_RCODE(rep->flags) ==
338*8f76bb7dSCy Schubert 			LDNS_RCODE_YXDOMAIN) &&
339*8f76bb7dSCy Schubert 			(qstate->env->cfg->serve_expired ||
340*8f76bb7dSCy Schubert 			*qstate->env->now <= rep->ttl)) {
341*8f76bb7dSCy Schubert 			/* we have a good entry, don't overwrite */
342e86b9096SDag-Erling Smørgrav 			lock_rw_unlock(&msg->entry.lock);
343e86b9096SDag-Erling Smørgrav 			return error_response(qstate, id, rcode);
344e86b9096SDag-Erling Smørgrav 		}
345e86b9096SDag-Erling Smørgrav 		lock_rw_unlock(&msg->entry.lock);
346*8f76bb7dSCy Schubert 		/* nothing interesting is cached (already error response or
347*8f76bb7dSCy Schubert 		 * expired good record when we don't serve expired), so this
348*8f76bb7dSCy Schubert 		 * servfail cache entry is useful (stops waste of time on this
349*8f76bb7dSCy Schubert 		 * servfail NORR_TTL) */
350e86b9096SDag-Erling Smørgrav 	}
351*8f76bb7dSCy Schubert 	/* store in cache */
352b7579f77SDag-Erling Smørgrav 	memset(&err, 0, sizeof(err));
353b7579f77SDag-Erling Smørgrav 	err.flags = (uint16_t)(BIT_QR | BIT_RA);
354b7579f77SDag-Erling Smørgrav 	FLAGS_SET_RCODE(err.flags, rcode);
355b7579f77SDag-Erling Smørgrav 	err.qdcount = 1;
356b7579f77SDag-Erling Smørgrav 	err.ttl = NORR_TTL;
357b7579f77SDag-Erling Smørgrav 	err.prefetch_ttl = PREFETCH_TTL_CALC(err.ttl);
3584c75e3aaSDag-Erling Smørgrav 	err.serve_expired_ttl = NORR_TTL;
359b7579f77SDag-Erling Smørgrav 	/* do not waste time trying to validate this servfail */
360b7579f77SDag-Erling Smørgrav 	err.security = sec_status_indeterminate;
361b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "store error response in message cache");
362ff825849SDag-Erling Smørgrav 	iter_dns_store(qstate->env, &qstate->qinfo, &err, 0, 0, 0, NULL,
363790c6b24SCy Schubert 		qstate->query_flags, qstate->qstarttime);
364b7579f77SDag-Erling Smørgrav 	return error_response(qstate, id, rcode);
365b7579f77SDag-Erling Smørgrav }
366b7579f77SDag-Erling Smørgrav 
367b7579f77SDag-Erling Smørgrav /** check if prepend item is duplicate item */
368b7579f77SDag-Erling Smørgrav static int
369b7579f77SDag-Erling Smørgrav prepend_is_duplicate(struct ub_packed_rrset_key** sets, size_t to,
370b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* dup)
371b7579f77SDag-Erling Smørgrav {
372b7579f77SDag-Erling Smørgrav 	size_t i;
373b7579f77SDag-Erling Smørgrav 	for(i=0; i<to; i++) {
374b7579f77SDag-Erling Smørgrav 		if(sets[i]->rk.type == dup->rk.type &&
375b7579f77SDag-Erling Smørgrav 			sets[i]->rk.rrset_class == dup->rk.rrset_class &&
376b7579f77SDag-Erling Smørgrav 			sets[i]->rk.dname_len == dup->rk.dname_len &&
377b7579f77SDag-Erling Smørgrav 			query_dname_compare(sets[i]->rk.dname, dup->rk.dname)
378b7579f77SDag-Erling Smørgrav 			== 0)
379b7579f77SDag-Erling Smørgrav 			return 1;
380b7579f77SDag-Erling Smørgrav 	}
381b7579f77SDag-Erling Smørgrav 	return 0;
382b7579f77SDag-Erling Smørgrav }
383b7579f77SDag-Erling Smørgrav 
384b7579f77SDag-Erling Smørgrav /** prepend the prepend list in the answer and authority section of dns_msg */
385b7579f77SDag-Erling Smørgrav static int
386b7579f77SDag-Erling Smørgrav iter_prepend(struct iter_qstate* iq, struct dns_msg* msg,
387b7579f77SDag-Erling Smørgrav 	struct regional* region)
388b7579f77SDag-Erling Smørgrav {
389b7579f77SDag-Erling Smørgrav 	struct iter_prep_list* p;
390b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key** sets;
391b7579f77SDag-Erling Smørgrav 	size_t num_an = 0, num_ns = 0;;
392b7579f77SDag-Erling Smørgrav 	for(p = iq->an_prepend_list; p; p = p->next)
393b7579f77SDag-Erling Smørgrav 		num_an++;
394b7579f77SDag-Erling Smørgrav 	for(p = iq->ns_prepend_list; p; p = p->next)
395b7579f77SDag-Erling Smørgrav 		num_ns++;
396b7579f77SDag-Erling Smørgrav 	if(num_an + num_ns == 0)
397b7579f77SDag-Erling Smørgrav 		return 1;
398b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "prepending %d rrsets", (int)num_an + (int)num_ns);
39909a3aaf3SDag-Erling Smørgrav 	if(num_an > RR_COUNT_MAX || num_ns > RR_COUNT_MAX ||
40009a3aaf3SDag-Erling Smørgrav 		msg->rep->rrset_count > RR_COUNT_MAX) return 0; /* overflow */
401b7579f77SDag-Erling Smørgrav 	sets = regional_alloc(region, (num_an+num_ns+msg->rep->rrset_count) *
402b7579f77SDag-Erling Smørgrav 		sizeof(struct ub_packed_rrset_key*));
403b7579f77SDag-Erling Smørgrav 	if(!sets)
404b7579f77SDag-Erling Smørgrav 		return 0;
405b7579f77SDag-Erling Smørgrav 	/* ANSWER section */
406b7579f77SDag-Erling Smørgrav 	num_an = 0;
407b7579f77SDag-Erling Smørgrav 	for(p = iq->an_prepend_list; p; p = p->next) {
408b7579f77SDag-Erling Smørgrav 		sets[num_an++] = p->rrset;
4090eefd307SCy Schubert 		if(ub_packed_rrset_ttl(p->rrset) < msg->rep->ttl)
4100eefd307SCy Schubert 			msg->rep->ttl = ub_packed_rrset_ttl(p->rrset);
411b7579f77SDag-Erling Smørgrav 	}
412b7579f77SDag-Erling Smørgrav 	memcpy(sets+num_an, msg->rep->rrsets, msg->rep->an_numrrsets *
413b7579f77SDag-Erling Smørgrav 		sizeof(struct ub_packed_rrset_key*));
414b7579f77SDag-Erling Smørgrav 	/* AUTH section */
415b7579f77SDag-Erling Smørgrav 	num_ns = 0;
416b7579f77SDag-Erling Smørgrav 	for(p = iq->ns_prepend_list; p; p = p->next) {
417b7579f77SDag-Erling Smørgrav 		if(prepend_is_duplicate(sets+msg->rep->an_numrrsets+num_an,
418b7579f77SDag-Erling Smørgrav 			num_ns, p->rrset) || prepend_is_duplicate(
419b7579f77SDag-Erling Smørgrav 			msg->rep->rrsets+msg->rep->an_numrrsets,
420b7579f77SDag-Erling Smørgrav 			msg->rep->ns_numrrsets, p->rrset))
421b7579f77SDag-Erling Smørgrav 			continue;
422b7579f77SDag-Erling Smørgrav 		sets[msg->rep->an_numrrsets + num_an + num_ns++] = p->rrset;
4230eefd307SCy Schubert 		if(ub_packed_rrset_ttl(p->rrset) < msg->rep->ttl)
4240eefd307SCy Schubert 			msg->rep->ttl = ub_packed_rrset_ttl(p->rrset);
425b7579f77SDag-Erling Smørgrav 	}
426b7579f77SDag-Erling Smørgrav 	memcpy(sets + num_an + msg->rep->an_numrrsets + num_ns,
427b7579f77SDag-Erling Smørgrav 		msg->rep->rrsets + msg->rep->an_numrrsets,
428b7579f77SDag-Erling Smørgrav 		(msg->rep->ns_numrrsets + msg->rep->ar_numrrsets) *
429b7579f77SDag-Erling Smørgrav 		sizeof(struct ub_packed_rrset_key*));
430b7579f77SDag-Erling Smørgrav 
431b7579f77SDag-Erling Smørgrav 	/* NXDOMAIN rcode can stay if we prepended DNAME/CNAMEs, because
432b7579f77SDag-Erling Smørgrav 	 * this is what recursors should give. */
433b7579f77SDag-Erling Smørgrav 	msg->rep->rrset_count += num_an + num_ns;
434b7579f77SDag-Erling Smørgrav 	msg->rep->an_numrrsets += num_an;
435b7579f77SDag-Erling Smørgrav 	msg->rep->ns_numrrsets += num_ns;
436b7579f77SDag-Erling Smørgrav 	msg->rep->rrsets = sets;
437b7579f77SDag-Erling Smørgrav 	return 1;
438b7579f77SDag-Erling Smørgrav }
439b7579f77SDag-Erling Smørgrav 
440b7579f77SDag-Erling Smørgrav /**
44165b390aaSDag-Erling Smørgrav  * Find rrset in ANSWER prepend list.
44265b390aaSDag-Erling Smørgrav  * to avoid duplicate DNAMEs when a DNAME is traversed twice.
44365b390aaSDag-Erling Smørgrav  * @param iq: iterator query state.
44465b390aaSDag-Erling Smørgrav  * @param rrset: rrset to add.
44565b390aaSDag-Erling Smørgrav  * @return false if not found
44665b390aaSDag-Erling Smørgrav  */
44765b390aaSDag-Erling Smørgrav static int
44865b390aaSDag-Erling Smørgrav iter_find_rrset_in_prepend_answer(struct iter_qstate* iq,
44965b390aaSDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset)
45065b390aaSDag-Erling Smørgrav {
45165b390aaSDag-Erling Smørgrav 	struct iter_prep_list* p = iq->an_prepend_list;
45265b390aaSDag-Erling Smørgrav 	while(p) {
45365b390aaSDag-Erling Smørgrav 		if(ub_rrset_compare(p->rrset, rrset) == 0 &&
45465b390aaSDag-Erling Smørgrav 			rrsetdata_equal((struct packed_rrset_data*)p->rrset
45565b390aaSDag-Erling Smørgrav 			->entry.data, (struct packed_rrset_data*)rrset
45665b390aaSDag-Erling Smørgrav 			->entry.data))
45765b390aaSDag-Erling Smørgrav 			return 1;
45865b390aaSDag-Erling Smørgrav 		p = p->next;
45965b390aaSDag-Erling Smørgrav 	}
46065b390aaSDag-Erling Smørgrav 	return 0;
46165b390aaSDag-Erling Smørgrav }
46265b390aaSDag-Erling Smørgrav 
46365b390aaSDag-Erling Smørgrav /**
464b7579f77SDag-Erling Smørgrav  * Add rrset to ANSWER prepend list
465b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
466b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
467b7579f77SDag-Erling Smørgrav  * @param rrset: rrset to add.
468b7579f77SDag-Erling Smørgrav  * @return false on failure (malloc).
469b7579f77SDag-Erling Smørgrav  */
470b7579f77SDag-Erling Smørgrav static int
471b7579f77SDag-Erling Smørgrav iter_add_prepend_answer(struct module_qstate* qstate, struct iter_qstate* iq,
472b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset)
473b7579f77SDag-Erling Smørgrav {
474b7579f77SDag-Erling Smørgrav 	struct iter_prep_list* p = (struct iter_prep_list*)regional_alloc(
475b7579f77SDag-Erling Smørgrav 		qstate->region, sizeof(struct iter_prep_list));
476b7579f77SDag-Erling Smørgrav 	if(!p)
477b7579f77SDag-Erling Smørgrav 		return 0;
478b7579f77SDag-Erling Smørgrav 	p->rrset = rrset;
479b7579f77SDag-Erling Smørgrav 	p->next = NULL;
480b7579f77SDag-Erling Smørgrav 	/* add at end */
481b7579f77SDag-Erling Smørgrav 	if(iq->an_prepend_last)
482b7579f77SDag-Erling Smørgrav 		iq->an_prepend_last->next = p;
483b7579f77SDag-Erling Smørgrav 	else	iq->an_prepend_list = p;
484b7579f77SDag-Erling Smørgrav 	iq->an_prepend_last = p;
485b7579f77SDag-Erling Smørgrav 	return 1;
486b7579f77SDag-Erling Smørgrav }
487b7579f77SDag-Erling Smørgrav 
488b7579f77SDag-Erling Smørgrav /**
489b7579f77SDag-Erling Smørgrav  * Add rrset to AUTHORITY prepend list
490b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
491b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
492b7579f77SDag-Erling Smørgrav  * @param rrset: rrset to add.
493b7579f77SDag-Erling Smørgrav  * @return false on failure (malloc).
494b7579f77SDag-Erling Smørgrav  */
495b7579f77SDag-Erling Smørgrav static int
496b7579f77SDag-Erling Smørgrav iter_add_prepend_auth(struct module_qstate* qstate, struct iter_qstate* iq,
497b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset)
498b7579f77SDag-Erling Smørgrav {
499b7579f77SDag-Erling Smørgrav 	struct iter_prep_list* p = (struct iter_prep_list*)regional_alloc(
500b7579f77SDag-Erling Smørgrav 		qstate->region, sizeof(struct iter_prep_list));
501b7579f77SDag-Erling Smørgrav 	if(!p)
502b7579f77SDag-Erling Smørgrav 		return 0;
503b7579f77SDag-Erling Smørgrav 	p->rrset = rrset;
504b7579f77SDag-Erling Smørgrav 	p->next = NULL;
505b7579f77SDag-Erling Smørgrav 	/* add at end */
506b7579f77SDag-Erling Smørgrav 	if(iq->ns_prepend_last)
507b7579f77SDag-Erling Smørgrav 		iq->ns_prepend_last->next = p;
508b7579f77SDag-Erling Smørgrav 	else	iq->ns_prepend_list = p;
509b7579f77SDag-Erling Smørgrav 	iq->ns_prepend_last = p;
510b7579f77SDag-Erling Smørgrav 	return 1;
511b7579f77SDag-Erling Smørgrav }
512b7579f77SDag-Erling Smørgrav 
513b7579f77SDag-Erling Smørgrav /**
514b7579f77SDag-Erling Smørgrav  * Given a CNAME response (defined as a response containing a CNAME or DNAME
515b7579f77SDag-Erling Smørgrav  * that does not answer the request), process the response, modifying the
516b7579f77SDag-Erling Smørgrav  * state as necessary. This follows the CNAME/DNAME chain and returns the
517b7579f77SDag-Erling Smørgrav  * final query name.
518b7579f77SDag-Erling Smørgrav  *
519b7579f77SDag-Erling Smørgrav  * sets the new query name, after following the CNAME/DNAME chain.
520b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
521b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
522b7579f77SDag-Erling Smørgrav  * @param msg: the response.
523b7579f77SDag-Erling Smørgrav  * @param mname: returned target new query name.
524b7579f77SDag-Erling Smørgrav  * @param mname_len: length of mname.
525b7579f77SDag-Erling Smørgrav  * @return false on (malloc) error.
526b7579f77SDag-Erling Smørgrav  */
527b7579f77SDag-Erling Smørgrav static int
528b7579f77SDag-Erling Smørgrav handle_cname_response(struct module_qstate* qstate, struct iter_qstate* iq,
529b7579f77SDag-Erling Smørgrav         struct dns_msg* msg, uint8_t** mname, size_t* mname_len)
530b7579f77SDag-Erling Smørgrav {
531b7579f77SDag-Erling Smørgrav 	size_t i;
532b7579f77SDag-Erling Smørgrav 	/* Start with the (current) qname. */
533b7579f77SDag-Erling Smørgrav 	*mname = iq->qchase.qname;
534b7579f77SDag-Erling Smørgrav 	*mname_len = iq->qchase.qname_len;
535b7579f77SDag-Erling Smørgrav 
536b7579f77SDag-Erling Smørgrav 	/* Iterate over the ANSWER rrsets in order, looking for CNAMEs and
537b7579f77SDag-Erling Smørgrav 	 * DNAMES. */
538b7579f77SDag-Erling Smørgrav 	for(i=0; i<msg->rep->an_numrrsets; i++) {
539b7579f77SDag-Erling Smørgrav 		struct ub_packed_rrset_key* r = msg->rep->rrsets[i];
540b7579f77SDag-Erling Smørgrav 		/* If there is a (relevant) DNAME, add it to the list.
541b7579f77SDag-Erling Smørgrav 		 * We always expect there to be CNAME that was generated
542b7579f77SDag-Erling Smørgrav 		 * by this DNAME following, so we don't process the DNAME
543b7579f77SDag-Erling Smørgrav 		 * directly.  */
544b7579f77SDag-Erling Smørgrav 		if(ntohs(r->rk.type) == LDNS_RR_TYPE_DNAME &&
54565b390aaSDag-Erling Smørgrav 			dname_strict_subdomain_c(*mname, r->rk.dname) &&
54665b390aaSDag-Erling Smørgrav 			!iter_find_rrset_in_prepend_answer(iq, r)) {
547b7579f77SDag-Erling Smørgrav 			if(!iter_add_prepend_answer(qstate, iq, r))
548b7579f77SDag-Erling Smørgrav 				return 0;
549b7579f77SDag-Erling Smørgrav 			continue;
550b7579f77SDag-Erling Smørgrav 		}
551b7579f77SDag-Erling Smørgrav 
552b7579f77SDag-Erling Smørgrav 		if(ntohs(r->rk.type) == LDNS_RR_TYPE_CNAME &&
55365b390aaSDag-Erling Smørgrav 			query_dname_compare(*mname, r->rk.dname) == 0 &&
55465b390aaSDag-Erling Smørgrav 			!iter_find_rrset_in_prepend_answer(iq, r)) {
555b7579f77SDag-Erling Smørgrav 			/* Add this relevant CNAME rrset to the prepend list.*/
556b7579f77SDag-Erling Smørgrav 			if(!iter_add_prepend_answer(qstate, iq, r))
557b7579f77SDag-Erling Smørgrav 				return 0;
558b7579f77SDag-Erling Smørgrav 			get_cname_target(r, mname, mname_len);
559b7579f77SDag-Erling Smørgrav 		}
560b7579f77SDag-Erling Smørgrav 
561b7579f77SDag-Erling Smørgrav 		/* Other rrsets in the section are ignored. */
562b7579f77SDag-Erling Smørgrav 	}
563b7579f77SDag-Erling Smørgrav 	/* add authority rrsets to authority prepend, for wildcarded CNAMEs */
564b7579f77SDag-Erling Smørgrav 	for(i=msg->rep->an_numrrsets; i<msg->rep->an_numrrsets +
565b7579f77SDag-Erling Smørgrav 		msg->rep->ns_numrrsets; i++) {
566b7579f77SDag-Erling Smørgrav 		struct ub_packed_rrset_key* r = msg->rep->rrsets[i];
567b7579f77SDag-Erling Smørgrav 		/* only add NSEC/NSEC3, as they may be needed for validation */
568b7579f77SDag-Erling Smørgrav 		if(ntohs(r->rk.type) == LDNS_RR_TYPE_NSEC ||
569b7579f77SDag-Erling Smørgrav 			ntohs(r->rk.type) == LDNS_RR_TYPE_NSEC3) {
570b7579f77SDag-Erling Smørgrav 			if(!iter_add_prepend_auth(qstate, iq, r))
571b7579f77SDag-Erling Smørgrav 				return 0;
572b7579f77SDag-Erling Smørgrav 		}
573b7579f77SDag-Erling Smørgrav 	}
574b7579f77SDag-Erling Smørgrav 	return 1;
575b7579f77SDag-Erling Smørgrav }
576b7579f77SDag-Erling Smørgrav 
577*8f76bb7dSCy Schubert /** fill fail address for later recovery */
578*8f76bb7dSCy Schubert static void
579*8f76bb7dSCy Schubert fill_fail_addr(struct iter_qstate* iq, struct sockaddr_storage* addr,
580*8f76bb7dSCy Schubert 	socklen_t addrlen)
581*8f76bb7dSCy Schubert {
582*8f76bb7dSCy Schubert 	if(addrlen == 0) {
583*8f76bb7dSCy Schubert 		iq->fail_addr_type = 0;
584*8f76bb7dSCy Schubert 		return;
585*8f76bb7dSCy Schubert 	}
586*8f76bb7dSCy Schubert 	if(((struct sockaddr_in*)addr)->sin_family == AF_INET) {
587*8f76bb7dSCy Schubert 		iq->fail_addr_type = 4;
588*8f76bb7dSCy Schubert 		memcpy(&iq->fail_addr.in,
589*8f76bb7dSCy Schubert 			&((struct sockaddr_in*)addr)->sin_addr,
590*8f76bb7dSCy Schubert 			sizeof(iq->fail_addr.in));
591*8f76bb7dSCy Schubert 	}
592*8f76bb7dSCy Schubert #ifdef AF_INET6
593*8f76bb7dSCy Schubert 	else if(((struct sockaddr_in*)addr)->sin_family == AF_INET6) {
594*8f76bb7dSCy Schubert 		iq->fail_addr_type = 6;
595*8f76bb7dSCy Schubert 		memcpy(&iq->fail_addr.in6,
596*8f76bb7dSCy Schubert 			&((struct sockaddr_in6*)addr)->sin6_addr,
597*8f76bb7dSCy Schubert 			sizeof(iq->fail_addr.in6));
598*8f76bb7dSCy Schubert 	}
599*8f76bb7dSCy Schubert #endif
600*8f76bb7dSCy Schubert 	else {
601*8f76bb7dSCy Schubert 		iq->fail_addr_type = 0;
602*8f76bb7dSCy Schubert 	}
603*8f76bb7dSCy Schubert }
604*8f76bb7dSCy Schubert 
605*8f76bb7dSCy Schubert /** print fail addr to string */
606*8f76bb7dSCy Schubert static void
607*8f76bb7dSCy Schubert print_fail_addr(struct iter_qstate* iq, char* buf, size_t len)
608*8f76bb7dSCy Schubert {
609*8f76bb7dSCy Schubert 	if(iq->fail_addr_type == 4) {
610*8f76bb7dSCy Schubert 		if(inet_ntop(AF_INET, &iq->fail_addr.in, buf,
611*8f76bb7dSCy Schubert 			(socklen_t)len) == 0)
612*8f76bb7dSCy Schubert 			(void)strlcpy(buf, "(inet_ntop error)", len);
613*8f76bb7dSCy Schubert 	}
614*8f76bb7dSCy Schubert #ifdef AF_INET6
615*8f76bb7dSCy Schubert 	else if(iq->fail_addr_type == 6) {
616*8f76bb7dSCy Schubert 		if(inet_ntop(AF_INET6, &iq->fail_addr.in6, buf,
617*8f76bb7dSCy Schubert 			(socklen_t)len) == 0)
618*8f76bb7dSCy Schubert 			(void)strlcpy(buf, "(inet_ntop error)", len);
619*8f76bb7dSCy Schubert 	}
620*8f76bb7dSCy Schubert #endif
621*8f76bb7dSCy Schubert 	else
622*8f76bb7dSCy Schubert 		(void)strlcpy(buf, "", len);
623*8f76bb7dSCy Schubert }
624*8f76bb7dSCy Schubert 
6255469a995SCy Schubert /** add response specific error information for log servfail */
6265469a995SCy Schubert static void
6275469a995SCy Schubert errinf_reply(struct module_qstate* qstate, struct iter_qstate* iq)
6285469a995SCy Schubert {
6295469a995SCy Schubert 	if(qstate->env->cfg->val_log_level < 2 && !qstate->env->cfg->log_servfail)
6305469a995SCy Schubert 		return;
631865f46b2SCy Schubert 	if((qstate->reply && qstate->reply->remote_addrlen != 0) ||
632*8f76bb7dSCy Schubert 		(iq->fail_addr_type != 0)) {
6335469a995SCy Schubert 		char from[256], frm[512];
634865f46b2SCy Schubert 		if(qstate->reply && qstate->reply->remote_addrlen != 0)
635865f46b2SCy Schubert 			addr_to_str(&qstate->reply->remote_addr,
636865f46b2SCy Schubert 				qstate->reply->remote_addrlen, from,
637865f46b2SCy Schubert 				sizeof(from));
6385469a995SCy Schubert 		else
639*8f76bb7dSCy Schubert 			print_fail_addr(iq, from, sizeof(from));
6405469a995SCy Schubert 		snprintf(frm, sizeof(frm), "from %s", from);
6415469a995SCy Schubert 		errinf(qstate, frm);
6425469a995SCy Schubert 	}
6435469a995SCy Schubert 	if(iq->scrub_failures || iq->parse_failures) {
6445469a995SCy Schubert 		if(iq->scrub_failures)
6455469a995SCy Schubert 			errinf(qstate, "upstream response failed scrub");
6465469a995SCy Schubert 		if(iq->parse_failures)
6475469a995SCy Schubert 			errinf(qstate, "could not parse upstream response");
6485469a995SCy Schubert 	} else if(iq->response == NULL && iq->timeout_count != 0) {
6495469a995SCy Schubert 		errinf(qstate, "upstream server timeout");
6505469a995SCy Schubert 	} else if(iq->response == NULL) {
6515469a995SCy Schubert 		errinf(qstate, "no server to query");
6525469a995SCy Schubert 		if(iq->dp) {
6535469a995SCy Schubert 			if(iq->dp->target_list == NULL)
6545469a995SCy Schubert 				errinf(qstate, "no addresses for nameservers");
6555469a995SCy Schubert 			else	errinf(qstate, "nameserver addresses not usable");
6565469a995SCy Schubert 			if(iq->dp->nslist == NULL)
6575469a995SCy Schubert 				errinf(qstate, "have no nameserver names");
6585469a995SCy Schubert 			if(iq->dp->bogus)
6595469a995SCy Schubert 				errinf(qstate, "NS record was dnssec bogus");
6605469a995SCy Schubert 		}
6615469a995SCy Schubert 	}
6625469a995SCy Schubert 	if(iq->response && iq->response->rep) {
6635469a995SCy Schubert 		if(FLAGS_GET_RCODE(iq->response->rep->flags) != 0) {
6645469a995SCy Schubert 			char rcode[256], rc[32];
6655469a995SCy Schubert 			(void)sldns_wire2str_rcode_buf(
6665469a995SCy Schubert 				FLAGS_GET_RCODE(iq->response->rep->flags),
6675469a995SCy Schubert 				rc, sizeof(rc));
6685469a995SCy Schubert 			snprintf(rcode, sizeof(rcode), "got %s", rc);
6695469a995SCy Schubert 			errinf(qstate, rcode);
6705469a995SCy Schubert 		} else {
6715469a995SCy Schubert 			/* rcode NOERROR */
6725469a995SCy Schubert 			if(iq->response->rep->an_numrrsets == 0) {
6735469a995SCy Schubert 				errinf(qstate, "nodata answer");
6745469a995SCy Schubert 			}
6755469a995SCy Schubert 		}
6765469a995SCy Schubert 	}
6775469a995SCy Schubert }
6785469a995SCy Schubert 
679c7f4d7adSDag-Erling Smørgrav /** see if last resort is possible - does config allow queries to parent */
680c7f4d7adSDag-Erling Smørgrav static int
681c7f4d7adSDag-Erling Smørgrav can_have_last_resort(struct module_env* env, uint8_t* nm, size_t nmlen,
6827da0adf7SDag-Erling Smørgrav 	uint16_t qclass, struct delegpt** retdp)
683c7f4d7adSDag-Erling Smørgrav {
684c7f4d7adSDag-Erling Smørgrav 	struct delegpt* fwddp;
685c7f4d7adSDag-Erling Smørgrav 	struct iter_hints_stub* stub;
686c7f4d7adSDag-Erling Smørgrav 	int labs = dname_count_labels(nm);
687c7f4d7adSDag-Erling Smørgrav 	/* do not process a last resort (the parent side) if a stub
688c7f4d7adSDag-Erling Smørgrav 	 * or forward is configured, because we do not want to go 'above'
689c7f4d7adSDag-Erling Smørgrav 	 * the configured servers */
690c7f4d7adSDag-Erling Smørgrav 	if(!dname_is_root(nm) && (stub = (struct iter_hints_stub*)
691c7f4d7adSDag-Erling Smørgrav 		name_tree_find(&env->hints->tree, nm, nmlen, labs, qclass)) &&
692c7f4d7adSDag-Erling Smørgrav 		/* has_parent side is turned off for stub_first, where we
693c7f4d7adSDag-Erling Smørgrav 		 * are allowed to go to the parent */
694c7f4d7adSDag-Erling Smørgrav 		stub->dp->has_parent_side_NS) {
6957da0adf7SDag-Erling Smørgrav 		if(retdp) *retdp = stub->dp;
696c7f4d7adSDag-Erling Smørgrav 		return 0;
697c7f4d7adSDag-Erling Smørgrav 	}
698c7f4d7adSDag-Erling Smørgrav 	if((fwddp = forwards_find(env->fwds, nm, qclass)) &&
699c7f4d7adSDag-Erling Smørgrav 		/* has_parent_side is turned off for forward_first, where
700c7f4d7adSDag-Erling Smørgrav 		 * we are allowed to go to the parent */
701c7f4d7adSDag-Erling Smørgrav 		fwddp->has_parent_side_NS) {
7027da0adf7SDag-Erling Smørgrav 		if(retdp) *retdp = fwddp;
703c7f4d7adSDag-Erling Smørgrav 		return 0;
704c7f4d7adSDag-Erling Smørgrav 	}
705c7f4d7adSDag-Erling Smørgrav 	return 1;
706c7f4d7adSDag-Erling Smørgrav }
707c7f4d7adSDag-Erling Smørgrav 
70809a3aaf3SDag-Erling Smørgrav /** see if target name is caps-for-id whitelisted */
70909a3aaf3SDag-Erling Smørgrav static int
71009a3aaf3SDag-Erling Smørgrav is_caps_whitelisted(struct iter_env* ie, struct iter_qstate* iq)
71109a3aaf3SDag-Erling Smørgrav {
71209a3aaf3SDag-Erling Smørgrav 	if(!ie->caps_white) return 0; /* no whitelist, or no capsforid */
71309a3aaf3SDag-Erling Smørgrav 	return name_tree_lookup(ie->caps_white, iq->qchase.qname,
71409a3aaf3SDag-Erling Smørgrav 		iq->qchase.qname_len, dname_count_labels(iq->qchase.qname),
71509a3aaf3SDag-Erling Smørgrav 		iq->qchase.qclass) != NULL;
71609a3aaf3SDag-Erling Smørgrav }
71709a3aaf3SDag-Erling Smørgrav 
7180a92a9fcSCy Schubert /**
7190a92a9fcSCy Schubert  * Create target count structure for this query. This is always explicitly
7200a92a9fcSCy Schubert  * created for the parent query.
7210a92a9fcSCy Schubert  */
72252df462fSXin LI static void
72352df462fSXin LI target_count_create(struct iter_qstate* iq)
72452df462fSXin LI {
72552df462fSXin LI 	if(!iq->target_count) {
7260a92a9fcSCy Schubert 		iq->target_count = (int*)calloc(TARGET_COUNT_MAX, sizeof(int));
72752df462fSXin LI 		/* if calloc fails we simply do not track this number */
7280a92a9fcSCy Schubert 		if(iq->target_count) {
7290a92a9fcSCy Schubert 			iq->target_count[TARGET_COUNT_REF] = 1;
7300a92a9fcSCy Schubert 			iq->nxns_dp = (uint8_t**)calloc(1, sizeof(uint8_t*));
7310a92a9fcSCy Schubert 		}
73252df462fSXin LI 	}
73352df462fSXin LI }
73452df462fSXin LI 
73552df462fSXin LI static void
73652df462fSXin LI target_count_increase(struct iter_qstate* iq, int num)
73752df462fSXin LI {
73852df462fSXin LI 	target_count_create(iq);
73952df462fSXin LI 	if(iq->target_count)
7400a92a9fcSCy Schubert 		iq->target_count[TARGET_COUNT_QUERIES] += num;
741091e9e46SCy Schubert 	iq->dp_target_count++;
742091e9e46SCy Schubert }
743091e9e46SCy Schubert 
744091e9e46SCy Schubert static void
745091e9e46SCy Schubert target_count_increase_nx(struct iter_qstate* iq, int num)
746091e9e46SCy Schubert {
747091e9e46SCy Schubert 	target_count_create(iq);
748091e9e46SCy Schubert 	if(iq->target_count)
7490a92a9fcSCy Schubert 		iq->target_count[TARGET_COUNT_NX] += num;
75052df462fSXin LI }
75152df462fSXin LI 
752b7579f77SDag-Erling Smørgrav /**
753b7579f77SDag-Erling Smørgrav  * Generate a subrequest.
754b7579f77SDag-Erling Smørgrav  * Generate a local request event. Local events are tied to this module, and
75505ab2901SDag-Erling Smørgrav  * have a corresponding (first tier) event that is waiting for this event to
756b7579f77SDag-Erling Smørgrav  * resolve to continue.
757b7579f77SDag-Erling Smørgrav  *
758b7579f77SDag-Erling Smørgrav  * @param qname The query name for this request.
759b7579f77SDag-Erling Smørgrav  * @param qnamelen length of qname
760b7579f77SDag-Erling Smørgrav  * @param qtype The query type for this request.
761b7579f77SDag-Erling Smørgrav  * @param qclass The query class for this request.
762b7579f77SDag-Erling Smørgrav  * @param qstate The event that is generating this event.
763b7579f77SDag-Erling Smørgrav  * @param id: module id.
764b7579f77SDag-Erling Smørgrav  * @param iq: The iterator state that is generating this event.
765b7579f77SDag-Erling Smørgrav  * @param initial_state The initial response state (normally this
766b7579f77SDag-Erling Smørgrav  *          is QUERY_RESP_STATE, unless it is known that the request won't
767b7579f77SDag-Erling Smørgrav  *          need iterative processing
768b7579f77SDag-Erling Smørgrav  * @param finalstate The final state for the response to this request.
769b7579f77SDag-Erling Smørgrav  * @param subq_ret: if newly allocated, the subquerystate, or NULL if it does
770b7579f77SDag-Erling Smørgrav  * 	not need initialisation.
771b7579f77SDag-Erling Smørgrav  * @param v: if true, validation is done on the subquery.
772091e9e46SCy Schubert  * @param detached: true if this qstate should not attach to the subquery
773b7579f77SDag-Erling Smørgrav  * @return false on error (malloc).
774b7579f77SDag-Erling Smørgrav  */
775b7579f77SDag-Erling Smørgrav static int
776b7579f77SDag-Erling Smørgrav generate_sub_request(uint8_t* qname, size_t qnamelen, uint16_t qtype,
777b7579f77SDag-Erling Smørgrav 	uint16_t qclass, struct module_qstate* qstate, int id,
778b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq, enum iter_state initial_state,
779091e9e46SCy Schubert 	enum iter_state finalstate, struct module_qstate** subq_ret, int v,
780091e9e46SCy Schubert 	int detached)
781b7579f77SDag-Erling Smørgrav {
782b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq = NULL;
783b7579f77SDag-Erling Smørgrav 	struct iter_qstate* subiq = NULL;
784b7579f77SDag-Erling Smørgrav 	uint16_t qflags = 0; /* OPCODE QUERY, no flags */
785b7579f77SDag-Erling Smørgrav 	struct query_info qinf;
786b7579f77SDag-Erling Smørgrav 	int prime = (finalstate == PRIME_RESP_STATE)?1:0;
787ff825849SDag-Erling Smørgrav 	int valrec = 0;
788b7579f77SDag-Erling Smørgrav 	qinf.qname = qname;
789b7579f77SDag-Erling Smørgrav 	qinf.qname_len = qnamelen;
790b7579f77SDag-Erling Smørgrav 	qinf.qtype = qtype;
791b7579f77SDag-Erling Smørgrav 	qinf.qclass = qclass;
792bc892140SDag-Erling Smørgrav 	qinf.local_alias = NULL;
793b7579f77SDag-Erling Smørgrav 
794b7579f77SDag-Erling Smørgrav 	/* RD should be set only when sending the query back through the INIT
795b7579f77SDag-Erling Smørgrav 	 * state. */
796b7579f77SDag-Erling Smørgrav 	if(initial_state == INIT_REQUEST_STATE)
797b7579f77SDag-Erling Smørgrav 		qflags |= BIT_RD;
798b7579f77SDag-Erling Smørgrav 	/* We set the CD flag so we can send this through the "head" of
799b7579f77SDag-Erling Smørgrav 	 * the resolution chain, which might have a validator. We are
800b7579f77SDag-Erling Smørgrav 	 * uninterested in validating things not on the direct resolution
801b7579f77SDag-Erling Smørgrav 	 * path.  */
802ff825849SDag-Erling Smørgrav 	if(!v) {
803b7579f77SDag-Erling Smørgrav 		qflags |= BIT_CD;
804ff825849SDag-Erling Smørgrav 		valrec = 1;
805ff825849SDag-Erling Smørgrav 	}
806b7579f77SDag-Erling Smørgrav 
807091e9e46SCy Schubert 	if(detached) {
808091e9e46SCy Schubert 		struct mesh_state* sub = NULL;
809091e9e46SCy Schubert 		fptr_ok(fptr_whitelist_modenv_add_sub(
810091e9e46SCy Schubert 			qstate->env->add_sub));
811091e9e46SCy Schubert 		if(!(*qstate->env->add_sub)(qstate, &qinf,
812091e9e46SCy Schubert 			qflags, prime, valrec, &subq, &sub)){
813b7579f77SDag-Erling Smørgrav 			return 0;
814b7579f77SDag-Erling Smørgrav 		}
815091e9e46SCy Schubert 	}
816091e9e46SCy Schubert 	else {
817091e9e46SCy Schubert 		/* attach subquery, lookup existing or make a new one */
818091e9e46SCy Schubert 		fptr_ok(fptr_whitelist_modenv_attach_sub(
819091e9e46SCy Schubert 			qstate->env->attach_sub));
820091e9e46SCy Schubert 		if(!(*qstate->env->attach_sub)(qstate, &qinf, qflags, prime,
821091e9e46SCy Schubert 			valrec, &subq)) {
822091e9e46SCy Schubert 			return 0;
823091e9e46SCy Schubert 		}
824091e9e46SCy Schubert 	}
825b7579f77SDag-Erling Smørgrav 	*subq_ret = subq;
826b7579f77SDag-Erling Smørgrav 	if(subq) {
827b7579f77SDag-Erling Smørgrav 		/* initialise the new subquery */
828b7579f77SDag-Erling Smørgrav 		subq->curmod = id;
829b7579f77SDag-Erling Smørgrav 		subq->ext_state[id] = module_state_initial;
830b7579f77SDag-Erling Smørgrav 		subq->minfo[id] = regional_alloc(subq->region,
831b7579f77SDag-Erling Smørgrav 			sizeof(struct iter_qstate));
832b7579f77SDag-Erling Smørgrav 		if(!subq->minfo[id]) {
833b7579f77SDag-Erling Smørgrav 			log_err("init subq: out of memory");
834b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
835b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
836b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
837b7579f77SDag-Erling Smørgrav 			return 0;
838b7579f77SDag-Erling Smørgrav 		}
839b7579f77SDag-Erling Smørgrav 		subiq = (struct iter_qstate*)subq->minfo[id];
840b7579f77SDag-Erling Smørgrav 		memset(subiq, 0, sizeof(*subiq));
841b7579f77SDag-Erling Smørgrav 		subiq->num_target_queries = 0;
84252df462fSXin LI 		target_count_create(iq);
84352df462fSXin LI 		subiq->target_count = iq->target_count;
8440a92a9fcSCy Schubert 		if(iq->target_count) {
8450a92a9fcSCy Schubert 			iq->target_count[TARGET_COUNT_REF] ++; /* extra reference */
8460a92a9fcSCy Schubert 			subiq->nxns_dp = iq->nxns_dp;
8470a92a9fcSCy Schubert 		}
848091e9e46SCy Schubert 		subiq->dp_target_count = 0;
849b7579f77SDag-Erling Smørgrav 		subiq->num_current_queries = 0;
850b7579f77SDag-Erling Smørgrav 		subiq->depth = iq->depth+1;
851b7579f77SDag-Erling Smørgrav 		outbound_list_init(&subiq->outlist);
852b7579f77SDag-Erling Smørgrav 		subiq->state = initial_state;
853b7579f77SDag-Erling Smørgrav 		subiq->final_state = finalstate;
854b7579f77SDag-Erling Smørgrav 		subiq->qchase = subq->qinfo;
855b7579f77SDag-Erling Smørgrav 		subiq->chase_flags = subq->query_flags;
856b7579f77SDag-Erling Smørgrav 		subiq->refetch_glue = 0;
85705ab2901SDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation)
85805ab2901SDag-Erling Smørgrav 			subiq->minimisation_state = INIT_MINIMISE_STATE;
85905ab2901SDag-Erling Smørgrav 		else
86005ab2901SDag-Erling Smørgrav 			subiq->minimisation_state = DONOT_MINIMISE_STATE;
86105ab2901SDag-Erling Smørgrav 		memset(&subiq->qinfo_out, 0, sizeof(struct query_info));
862b7579f77SDag-Erling Smørgrav 	}
863b7579f77SDag-Erling Smørgrav 	return 1;
864b7579f77SDag-Erling Smørgrav }
865b7579f77SDag-Erling Smørgrav 
866b7579f77SDag-Erling Smørgrav /**
867b7579f77SDag-Erling Smørgrav  * Generate and send a root priming request.
868b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
869b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
870b7579f77SDag-Erling Smørgrav  * @param id: module id.
871b7579f77SDag-Erling Smørgrav  * @param qclass: the class to prime.
872b7579f77SDag-Erling Smørgrav  * @return 0 on failure
873b7579f77SDag-Erling Smørgrav  */
874b7579f77SDag-Erling Smørgrav static int
875b7579f77SDag-Erling Smørgrav prime_root(struct module_qstate* qstate, struct iter_qstate* iq, int id,
876b7579f77SDag-Erling Smørgrav 	uint16_t qclass)
877b7579f77SDag-Erling Smørgrav {
878b7579f77SDag-Erling Smørgrav 	struct delegpt* dp;
879b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
880b7579f77SDag-Erling Smørgrav 	verbose(VERB_DETAIL, "priming . %s NS",
88117d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rr_classes, (int)qclass)?
88217d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rr_classes, (int)qclass)->name:"??");
883b7579f77SDag-Erling Smørgrav 	dp = hints_lookup_root(qstate->env->hints, qclass);
884b7579f77SDag-Erling Smørgrav 	if(!dp) {
885b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "Cannot prime due to lack of hints");
886b7579f77SDag-Erling Smørgrav 		return 0;
887b7579f77SDag-Erling Smørgrav 	}
888b7579f77SDag-Erling Smørgrav 	/* Priming requests start at the QUERYTARGETS state, skipping
889b7579f77SDag-Erling Smørgrav 	 * the normal INIT state logic (which would cause an infloop). */
890b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request((uint8_t*)"\000", 1, LDNS_RR_TYPE_NS,
891b7579f77SDag-Erling Smørgrav 		qclass, qstate, id, iq, QUERYTARGETS_STATE, PRIME_RESP_STATE,
892091e9e46SCy Schubert 		&subq, 0, 0)) {
893b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not prime root");
894b7579f77SDag-Erling Smørgrav 		return 0;
895b7579f77SDag-Erling Smørgrav 	}
896b7579f77SDag-Erling Smørgrav 	if(subq) {
897b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
898b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
899b7579f77SDag-Erling Smørgrav 		/* Set the initial delegation point to the hint.
900b7579f77SDag-Erling Smørgrav 		 * copy dp, it is now part of the root prime query.
901b7579f77SDag-Erling Smørgrav 		 * dp was part of in the fixed hints structure. */
902b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(dp, subq->region);
903b7579f77SDag-Erling Smørgrav 		if(!subiq->dp) {
904b7579f77SDag-Erling Smørgrav 			log_err("out of memory priming root, copydp");
905b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
906b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
907b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
908b7579f77SDag-Erling Smørgrav 			return 0;
909b7579f77SDag-Erling Smørgrav 		}
910b7579f77SDag-Erling Smørgrav 		/* there should not be any target queries. */
911b7579f77SDag-Erling Smørgrav 		subiq->num_target_queries = 0;
912b7579f77SDag-Erling Smørgrav 		subiq->dnssec_expected = iter_indicates_dnssec(
913b7579f77SDag-Erling Smørgrav 			qstate->env, subiq->dp, NULL, subq->qinfo.qclass);
914b7579f77SDag-Erling Smørgrav 	}
915b7579f77SDag-Erling Smørgrav 
916b7579f77SDag-Erling Smørgrav 	/* this module stops, our submodule starts, and does the query. */
917b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_wait_subquery;
918b7579f77SDag-Erling Smørgrav 	return 1;
919b7579f77SDag-Erling Smørgrav }
920b7579f77SDag-Erling Smørgrav 
921b7579f77SDag-Erling Smørgrav /**
922b7579f77SDag-Erling Smørgrav  * Generate and process a stub priming request. This method tests for the
923b7579f77SDag-Erling Smørgrav  * need to prime a stub zone, so it is safe to call for every request.
924b7579f77SDag-Erling Smørgrav  *
925b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
926b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
927b7579f77SDag-Erling Smørgrav  * @param id: module id.
928b7579f77SDag-Erling Smørgrav  * @param qname: request name.
929b7579f77SDag-Erling Smørgrav  * @param qclass: request class.
930b7579f77SDag-Erling Smørgrav  * @return true if a priming subrequest was made, false if not. The will only
931b7579f77SDag-Erling Smørgrav  *         issue a priming request if it detects an unprimed stub.
932b7579f77SDag-Erling Smørgrav  *         Uses value of 2 to signal during stub-prime in root-prime situation
933b7579f77SDag-Erling Smørgrav  *         that a noprime-stub is available and resolution can continue.
934b7579f77SDag-Erling Smørgrav  */
935b7579f77SDag-Erling Smørgrav static int
936b7579f77SDag-Erling Smørgrav prime_stub(struct module_qstate* qstate, struct iter_qstate* iq, int id,
937b7579f77SDag-Erling Smørgrav 	uint8_t* qname, uint16_t qclass)
938b7579f77SDag-Erling Smørgrav {
939b7579f77SDag-Erling Smørgrav 	/* Lookup the stub hint. This will return null if the stub doesn't
940b7579f77SDag-Erling Smørgrav 	 * need to be re-primed. */
941b7579f77SDag-Erling Smørgrav 	struct iter_hints_stub* stub;
942b7579f77SDag-Erling Smørgrav 	struct delegpt* stub_dp;
943b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
944b7579f77SDag-Erling Smørgrav 
945b7579f77SDag-Erling Smørgrav 	if(!qname) return 0;
946b7579f77SDag-Erling Smørgrav 	stub = hints_lookup_stub(qstate->env->hints, qname, qclass, iq->dp);
947b7579f77SDag-Erling Smørgrav 	/* The stub (if there is one) does not need priming. */
948b7579f77SDag-Erling Smørgrav 	if(!stub)
949b7579f77SDag-Erling Smørgrav 		return 0;
950b7579f77SDag-Erling Smørgrav 	stub_dp = stub->dp;
95157bddd21SDag-Erling Smørgrav 	/* if we have an auth_zone dp, and stub is equal, don't prime stub
95257bddd21SDag-Erling Smørgrav 	 * yet, unless we want to fallback and avoid the auth_zone */
95357bddd21SDag-Erling Smørgrav 	if(!iq->auth_zone_avoid && iq->dp && iq->dp->auth_dp &&
95457bddd21SDag-Erling Smørgrav 		query_dname_compare(iq->dp->name, stub_dp->name) == 0)
95557bddd21SDag-Erling Smørgrav 		return 0;
956b7579f77SDag-Erling Smørgrav 
957b7579f77SDag-Erling Smørgrav 	/* is it a noprime stub (always use) */
958b7579f77SDag-Erling Smørgrav 	if(stub->noprime) {
959b7579f77SDag-Erling Smørgrav 		int r = 0;
960b7579f77SDag-Erling Smørgrav 		if(iq->dp == NULL) r = 2;
961b7579f77SDag-Erling Smørgrav 		/* copy the dp out of the fixed hints structure, so that
962b7579f77SDag-Erling Smørgrav 		 * it can be changed when servicing this query */
963b7579f77SDag-Erling Smørgrav 		iq->dp = delegpt_copy(stub_dp, qstate->region);
964b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
965b7579f77SDag-Erling Smørgrav 			log_err("out of memory priming stub");
9664c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, priming stub");
967b7579f77SDag-Erling Smørgrav 			(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
968b7579f77SDag-Erling Smørgrav 			return 1; /* return 1 to make module stop, with error */
969b7579f77SDag-Erling Smørgrav 		}
970b7579f77SDag-Erling Smørgrav 		log_nametypeclass(VERB_DETAIL, "use stub", stub_dp->name,
971b7579f77SDag-Erling Smørgrav 			LDNS_RR_TYPE_NS, qclass);
972b7579f77SDag-Erling Smørgrav 		return r;
973b7579f77SDag-Erling Smørgrav 	}
974b7579f77SDag-Erling Smørgrav 
975b7579f77SDag-Erling Smørgrav 	/* Otherwise, we need to (re)prime the stub. */
976b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_DETAIL, "priming stub", stub_dp->name,
977b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, qclass);
978b7579f77SDag-Erling Smørgrav 
979b7579f77SDag-Erling Smørgrav 	/* Stub priming events start at the QUERYTARGETS state to avoid the
980b7579f77SDag-Erling Smørgrav 	 * redundant INIT state processing. */
981b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(stub_dp->name, stub_dp->namelen,
982b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, qclass, qstate, id, iq,
983091e9e46SCy Schubert 		QUERYTARGETS_STATE, PRIME_RESP_STATE, &subq, 0, 0)) {
984b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not prime stub");
9854c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "could not generate lookup for stub prime");
986b7579f77SDag-Erling Smørgrav 		(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
987b7579f77SDag-Erling Smørgrav 		return 1; /* return 1 to make module stop, with error */
988b7579f77SDag-Erling Smørgrav 	}
989b7579f77SDag-Erling Smørgrav 	if(subq) {
990b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
991b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
992b7579f77SDag-Erling Smørgrav 
993b7579f77SDag-Erling Smørgrav 		/* Set the initial delegation point to the hint. */
994b7579f77SDag-Erling Smørgrav 		/* make copy to avoid use of stub dp by different qs/threads */
995b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(stub_dp, subq->region);
996b7579f77SDag-Erling Smørgrav 		if(!subiq->dp) {
997b7579f77SDag-Erling Smørgrav 			log_err("out of memory priming stub, copydp");
998b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
999b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
1000b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
10014c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, in stub prime");
1002b7579f77SDag-Erling Smørgrav 			(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1003b7579f77SDag-Erling Smørgrav 			return 1; /* return 1 to make module stop, with error */
1004b7579f77SDag-Erling Smørgrav 		}
1005b7579f77SDag-Erling Smørgrav 		/* there should not be any target queries -- although there
1006b7579f77SDag-Erling Smørgrav 		 * wouldn't be anyway, since stub hints never have
1007b7579f77SDag-Erling Smørgrav 		 * missing targets. */
1008b7579f77SDag-Erling Smørgrav 		subiq->num_target_queries = 0;
1009b7579f77SDag-Erling Smørgrav 		subiq->wait_priming_stub = 1;
1010b7579f77SDag-Erling Smørgrav 		subiq->dnssec_expected = iter_indicates_dnssec(
1011b7579f77SDag-Erling Smørgrav 			qstate->env, subiq->dp, NULL, subq->qinfo.qclass);
1012b7579f77SDag-Erling Smørgrav 	}
1013b7579f77SDag-Erling Smørgrav 
1014b7579f77SDag-Erling Smørgrav 	/* this module stops, our submodule starts, and does the query. */
1015b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_wait_subquery;
1016b7579f77SDag-Erling Smørgrav 	return 1;
1017b7579f77SDag-Erling Smørgrav }
1018b7579f77SDag-Erling Smørgrav 
1019b7579f77SDag-Erling Smørgrav /**
102057bddd21SDag-Erling Smørgrav  * Generate a delegation point for an auth zone (unless cached dp is better)
102157bddd21SDag-Erling Smørgrav  * false on alloc failure.
102257bddd21SDag-Erling Smørgrav  */
102357bddd21SDag-Erling Smørgrav static int
102457bddd21SDag-Erling Smørgrav auth_zone_delegpt(struct module_qstate* qstate, struct iter_qstate* iq,
102557bddd21SDag-Erling Smørgrav 	uint8_t* delname, size_t delnamelen)
102657bddd21SDag-Erling Smørgrav {
102757bddd21SDag-Erling Smørgrav 	struct auth_zone* z;
102857bddd21SDag-Erling Smørgrav 	if(iq->auth_zone_avoid)
102957bddd21SDag-Erling Smørgrav 		return 1;
103057bddd21SDag-Erling Smørgrav 	if(!delname) {
103157bddd21SDag-Erling Smørgrav 		delname = iq->qchase.qname;
103257bddd21SDag-Erling Smørgrav 		delnamelen = iq->qchase.qname_len;
103357bddd21SDag-Erling Smørgrav 	}
103457bddd21SDag-Erling Smørgrav 	lock_rw_rdlock(&qstate->env->auth_zones->lock);
103557bddd21SDag-Erling Smørgrav 	z = auth_zones_find_zone(qstate->env->auth_zones, delname, delnamelen,
103657bddd21SDag-Erling Smørgrav 		qstate->qinfo.qclass);
103757bddd21SDag-Erling Smørgrav 	if(!z) {
103857bddd21SDag-Erling Smørgrav 		lock_rw_unlock(&qstate->env->auth_zones->lock);
103957bddd21SDag-Erling Smørgrav 		return 1;
104057bddd21SDag-Erling Smørgrav 	}
104157bddd21SDag-Erling Smørgrav 	lock_rw_rdlock(&z->lock);
104257bddd21SDag-Erling Smørgrav 	lock_rw_unlock(&qstate->env->auth_zones->lock);
104357bddd21SDag-Erling Smørgrav 	if(z->for_upstream) {
104457bddd21SDag-Erling Smørgrav 		if(iq->dp && query_dname_compare(z->name, iq->dp->name) == 0
104557bddd21SDag-Erling Smørgrav 			&& iq->dp->auth_dp && qstate->blacklist &&
104657bddd21SDag-Erling Smørgrav 			z->fallback_enabled) {
104757bddd21SDag-Erling Smørgrav 			/* cache is blacklisted and fallback, and we
104857bddd21SDag-Erling Smørgrav 			 * already have an auth_zone dp */
104957bddd21SDag-Erling Smørgrav 			if(verbosity>=VERB_ALGO) {
105057bddd21SDag-Erling Smørgrav 				char buf[255+1];
105157bddd21SDag-Erling Smørgrav 				dname_str(z->name, buf);
105257bddd21SDag-Erling Smørgrav 				verbose(VERB_ALGO, "auth_zone %s "
105357bddd21SDag-Erling Smørgrav 				  "fallback because cache blacklisted",
105457bddd21SDag-Erling Smørgrav 				  buf);
105557bddd21SDag-Erling Smørgrav 			}
105657bddd21SDag-Erling Smørgrav 			lock_rw_unlock(&z->lock);
105757bddd21SDag-Erling Smørgrav 			iq->dp = NULL;
105857bddd21SDag-Erling Smørgrav 			return 1;
105957bddd21SDag-Erling Smørgrav 		}
106057bddd21SDag-Erling Smørgrav 		if(iq->dp==NULL || dname_subdomain_c(z->name, iq->dp->name)) {
106157bddd21SDag-Erling Smørgrav 			struct delegpt* dp;
106257bddd21SDag-Erling Smørgrav 			if(qstate->blacklist && z->fallback_enabled) {
106357bddd21SDag-Erling Smørgrav 				/* cache is blacklisted because of a DNSSEC
106457bddd21SDag-Erling Smørgrav 				 * validation failure, and the zone allows
106557bddd21SDag-Erling Smørgrav 				 * fallback to the internet, query there. */
106657bddd21SDag-Erling Smørgrav 				if(verbosity>=VERB_ALGO) {
106757bddd21SDag-Erling Smørgrav 					char buf[255+1];
106857bddd21SDag-Erling Smørgrav 					dname_str(z->name, buf);
106957bddd21SDag-Erling Smørgrav 					verbose(VERB_ALGO, "auth_zone %s "
107057bddd21SDag-Erling Smørgrav 					  "fallback because cache blacklisted",
107157bddd21SDag-Erling Smørgrav 					  buf);
107257bddd21SDag-Erling Smørgrav 				}
107357bddd21SDag-Erling Smørgrav 				lock_rw_unlock(&z->lock);
107457bddd21SDag-Erling Smørgrav 				return 1;
107557bddd21SDag-Erling Smørgrav 			}
107657bddd21SDag-Erling Smørgrav 			dp = (struct delegpt*)regional_alloc_zero(
107757bddd21SDag-Erling Smørgrav 				qstate->region, sizeof(*dp));
107857bddd21SDag-Erling Smørgrav 			if(!dp) {
107957bddd21SDag-Erling Smørgrav 				log_err("alloc failure");
108057bddd21SDag-Erling Smørgrav 				if(z->fallback_enabled) {
108157bddd21SDag-Erling Smørgrav 					lock_rw_unlock(&z->lock);
108257bddd21SDag-Erling Smørgrav 					return 1; /* just fallback */
108357bddd21SDag-Erling Smørgrav 				}
108457bddd21SDag-Erling Smørgrav 				lock_rw_unlock(&z->lock);
10854c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "malloc failure");
108657bddd21SDag-Erling Smørgrav 				return 0;
108757bddd21SDag-Erling Smørgrav 			}
108857bddd21SDag-Erling Smørgrav 			dp->name = regional_alloc_init(qstate->region,
108957bddd21SDag-Erling Smørgrav 				z->name, z->namelen);
109057bddd21SDag-Erling Smørgrav 			if(!dp->name) {
109157bddd21SDag-Erling Smørgrav 				log_err("alloc failure");
109257bddd21SDag-Erling Smørgrav 				if(z->fallback_enabled) {
109357bddd21SDag-Erling Smørgrav 					lock_rw_unlock(&z->lock);
109457bddd21SDag-Erling Smørgrav 					return 1; /* just fallback */
109557bddd21SDag-Erling Smørgrav 				}
109657bddd21SDag-Erling Smørgrav 				lock_rw_unlock(&z->lock);
10974c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "malloc failure");
109857bddd21SDag-Erling Smørgrav 				return 0;
109957bddd21SDag-Erling Smørgrav 			}
110057bddd21SDag-Erling Smørgrav 			dp->namelen = z->namelen;
110157bddd21SDag-Erling Smørgrav 			dp->namelabs = z->namelabs;
110257bddd21SDag-Erling Smørgrav 			dp->auth_dp = 1;
110357bddd21SDag-Erling Smørgrav 			iq->dp = dp;
110457bddd21SDag-Erling Smørgrav 		}
110557bddd21SDag-Erling Smørgrav 	}
110657bddd21SDag-Erling Smørgrav 
110757bddd21SDag-Erling Smørgrav 	lock_rw_unlock(&z->lock);
110857bddd21SDag-Erling Smørgrav 	return 1;
110957bddd21SDag-Erling Smørgrav }
111057bddd21SDag-Erling Smørgrav 
111157bddd21SDag-Erling Smørgrav /**
1112b7579f77SDag-Erling Smørgrav  * Generate A and AAAA checks for glue that is in-zone for the referral
11138a384985SDag-Erling Smørgrav  * we just got to obtain authoritative information on the addresses.
1114b7579f77SDag-Erling Smørgrav  *
1115b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
1116b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1117b7579f77SDag-Erling Smørgrav  * @param id: module id.
1118b7579f77SDag-Erling Smørgrav  */
1119b7579f77SDag-Erling Smørgrav static void
1120b7579f77SDag-Erling Smørgrav generate_a_aaaa_check(struct module_qstate* qstate, struct iter_qstate* iq,
1121b7579f77SDag-Erling Smørgrav 	int id)
1122b7579f77SDag-Erling Smørgrav {
1123b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
1124b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1125b7579f77SDag-Erling Smørgrav 	size_t i;
1126b7579f77SDag-Erling Smørgrav 	struct reply_info* rep = iq->response->rep;
1127b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* s;
1128b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
1129b7579f77SDag-Erling Smørgrav 
1130b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth)
1131b7579f77SDag-Erling Smørgrav 		return;
1132b7579f77SDag-Erling Smørgrav 	/* walk through additional, and check if in-zone,
1133b7579f77SDag-Erling Smørgrav 	 * only relevant A, AAAA are left after scrub anyway */
1134b7579f77SDag-Erling Smørgrav 	for(i=rep->an_numrrsets+rep->ns_numrrsets; i<rep->rrset_count; i++) {
1135b7579f77SDag-Erling Smørgrav 		s = rep->rrsets[i];
1136b7579f77SDag-Erling Smørgrav 		/* check *ALL* addresses that are transmitted in additional*/
1137b7579f77SDag-Erling Smørgrav 		/* is it an address ? */
1138b7579f77SDag-Erling Smørgrav 		if( !(ntohs(s->rk.type)==LDNS_RR_TYPE_A ||
1139b7579f77SDag-Erling Smørgrav 			ntohs(s->rk.type)==LDNS_RR_TYPE_AAAA)) {
1140b7579f77SDag-Erling Smørgrav 			continue;
1141b7579f77SDag-Erling Smørgrav 		}
1142b7579f77SDag-Erling Smørgrav 		/* is this query the same as the A/AAAA check for it */
1143b7579f77SDag-Erling Smørgrav 		if(qstate->qinfo.qtype == ntohs(s->rk.type) &&
1144b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qclass == ntohs(s->rk.rrset_class) &&
1145b7579f77SDag-Erling Smørgrav 			query_dname_compare(qstate->qinfo.qname,
1146b7579f77SDag-Erling Smørgrav 				s->rk.dname)==0 &&
1147b7579f77SDag-Erling Smørgrav 			(qstate->query_flags&BIT_RD) &&
1148b7579f77SDag-Erling Smørgrav 			!(qstate->query_flags&BIT_CD))
1149b7579f77SDag-Erling Smørgrav 			continue;
1150b7579f77SDag-Erling Smørgrav 
1151b7579f77SDag-Erling Smørgrav 		/* generate subrequest for it */
1152b7579f77SDag-Erling Smørgrav 		log_nametypeclass(VERB_ALGO, "schedule addr fetch",
1153b7579f77SDag-Erling Smørgrav 			s->rk.dname, ntohs(s->rk.type),
1154b7579f77SDag-Erling Smørgrav 			ntohs(s->rk.rrset_class));
1155b7579f77SDag-Erling Smørgrav 		if(!generate_sub_request(s->rk.dname, s->rk.dname_len,
1156b7579f77SDag-Erling Smørgrav 			ntohs(s->rk.type), ntohs(s->rk.rrset_class),
1157b7579f77SDag-Erling Smørgrav 			qstate, id, iq,
1158091e9e46SCy Schubert 			INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1, 0)) {
1159b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "could not generate addr check");
1160b7579f77SDag-Erling Smørgrav 			return;
1161b7579f77SDag-Erling Smørgrav 		}
1162b7579f77SDag-Erling Smørgrav 		/* ignore subq - not need for more init */
1163b7579f77SDag-Erling Smørgrav 	}
1164b7579f77SDag-Erling Smørgrav }
1165b7579f77SDag-Erling Smørgrav 
1166b7579f77SDag-Erling Smørgrav /**
1167b7579f77SDag-Erling Smørgrav  * Generate a NS check request to obtain authoritative information
1168b7579f77SDag-Erling Smørgrav  * on an NS rrset.
1169b7579f77SDag-Erling Smørgrav  *
1170*8f76bb7dSCy Schubert  * @param qstate: the qstate that triggered the need to prime.
1171b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1172b7579f77SDag-Erling Smørgrav  * @param id: module id.
1173b7579f77SDag-Erling Smørgrav  */
1174b7579f77SDag-Erling Smørgrav static void
1175b7579f77SDag-Erling Smørgrav generate_ns_check(struct module_qstate* qstate, struct iter_qstate* iq, int id)
1176b7579f77SDag-Erling Smørgrav {
1177b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
1178b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1179b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
1180b7579f77SDag-Erling Smørgrav 
1181b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth)
1182b7579f77SDag-Erling Smørgrav 		return;
1183c7f4d7adSDag-Erling Smørgrav 	if(!can_have_last_resort(qstate->env, iq->dp->name, iq->dp->namelen,
11847da0adf7SDag-Erling Smørgrav 		iq->qchase.qclass, NULL))
1185c7f4d7adSDag-Erling Smørgrav 		return;
1186b7579f77SDag-Erling Smørgrav 	/* is this query the same as the nscheck? */
1187b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_NS &&
1188b7579f77SDag-Erling Smørgrav 		query_dname_compare(iq->dp->name, qstate->qinfo.qname)==0 &&
1189b7579f77SDag-Erling Smørgrav 		(qstate->query_flags&BIT_RD) && !(qstate->query_flags&BIT_CD)){
1190b7579f77SDag-Erling Smørgrav 		/* spawn off A, AAAA queries for in-zone glue to check */
1191b7579f77SDag-Erling Smørgrav 		generate_a_aaaa_check(qstate, iq, id);
1192b7579f77SDag-Erling Smørgrav 		return;
1193b7579f77SDag-Erling Smørgrav 	}
119457bddd21SDag-Erling Smørgrav 	/* no need to get the NS record for DS, it is above the zonecut */
119557bddd21SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_DS)
119657bddd21SDag-Erling Smørgrav 		return;
1197b7579f77SDag-Erling Smørgrav 
1198b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_ALGO, "schedule ns fetch",
1199b7579f77SDag-Erling Smørgrav 		iq->dp->name, LDNS_RR_TYPE_NS, iq->qchase.qclass);
1200b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(iq->dp->name, iq->dp->namelen,
1201b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, iq->qchase.qclass, qstate, id, iq,
1202091e9e46SCy Schubert 		INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1, 0)) {
1203b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not generate ns check");
1204b7579f77SDag-Erling Smørgrav 		return;
1205b7579f77SDag-Erling Smørgrav 	}
1206b7579f77SDag-Erling Smørgrav 	if(subq) {
1207b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
1208b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
1209b7579f77SDag-Erling Smørgrav 
1210b7579f77SDag-Erling Smørgrav 		/* make copy to avoid use of stub dp by different qs/threads */
1211b7579f77SDag-Erling Smørgrav 		/* refetch glue to start higher up the tree */
1212b7579f77SDag-Erling Smørgrav 		subiq->refetch_glue = 1;
1213b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(iq->dp, subq->region);
1214b7579f77SDag-Erling Smørgrav 		if(!subiq->dp) {
1215b7579f77SDag-Erling Smørgrav 			log_err("out of memory generating ns check, copydp");
1216b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
1217b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
1218b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
1219b7579f77SDag-Erling Smørgrav 			return;
1220b7579f77SDag-Erling Smørgrav 		}
1221b7579f77SDag-Erling Smørgrav 	}
1222b7579f77SDag-Erling Smørgrav }
1223b7579f77SDag-Erling Smørgrav 
1224b7579f77SDag-Erling Smørgrav /**
1225b7579f77SDag-Erling Smørgrav  * Generate a DNSKEY prefetch query to get the DNSKEY for the DS record we
1226b7579f77SDag-Erling Smørgrav  * just got in a referral (where we have dnssec_expected, thus have trust
1227b7579f77SDag-Erling Smørgrav  * anchors above it).  Note that right after calling this routine the
1228b7579f77SDag-Erling Smørgrav  * iterator detached subqueries (because of following the referral), and thus
1229b7579f77SDag-Erling Smørgrav  * the DNSKEY query becomes detached, its return stored in the cache for
1230b7579f77SDag-Erling Smørgrav  * later lookup by the validator.  This cache lookup by the validator avoids
1231b7579f77SDag-Erling Smørgrav  * the roundtrip incurred by the DNSKEY query.  The DNSKEY query is now
1232b7579f77SDag-Erling Smørgrav  * performed at about the same time the original query is sent to the domain,
1233b7579f77SDag-Erling Smørgrav  * thus the two answers are likely to be returned at about the same time,
1234b7579f77SDag-Erling Smørgrav  * saving a roundtrip from the validated lookup.
1235b7579f77SDag-Erling Smørgrav  *
1236b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
1237b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1238b7579f77SDag-Erling Smørgrav  * @param id: module id.
1239b7579f77SDag-Erling Smørgrav  */
1240b7579f77SDag-Erling Smørgrav static void
1241b7579f77SDag-Erling Smørgrav generate_dnskey_prefetch(struct module_qstate* qstate,
1242b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq, int id)
1243b7579f77SDag-Erling Smørgrav {
1244b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1245b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
1246b7579f77SDag-Erling Smørgrav 
1247b7579f77SDag-Erling Smørgrav 	/* is this query the same as the prefetch? */
1248b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_DNSKEY &&
1249b7579f77SDag-Erling Smørgrav 		query_dname_compare(iq->dp->name, qstate->qinfo.qname)==0 &&
1250b7579f77SDag-Erling Smørgrav 		(qstate->query_flags&BIT_RD) && !(qstate->query_flags&BIT_CD)){
1251b7579f77SDag-Erling Smørgrav 		return;
1252b7579f77SDag-Erling Smørgrav 	}
12534f5c8956SCy Schubert 	/* we do not generate this prefetch when the query list is full,
12544f5c8956SCy Schubert 	 * the query is fetched, if needed, when the validator wants it.
12554f5c8956SCy Schubert 	 * At that time the validator waits for it, after spawning it.
12564f5c8956SCy Schubert 	 * This means there is one state that uses cpu and a socket, the
12574f5c8956SCy Schubert 	 * spawned while this one waits, and not several at the same time,
12584f5c8956SCy Schubert 	 * if we had created the lookup here. And this helps to keep
12594f5c8956SCy Schubert 	 * the total load down, but the query still succeeds to resolve. */
12604f5c8956SCy Schubert 	if(mesh_jostle_exceeded(qstate->env->mesh))
12614f5c8956SCy Schubert 		return;
1262b7579f77SDag-Erling Smørgrav 
1263b7579f77SDag-Erling Smørgrav 	/* if the DNSKEY is in the cache this lookup will stop quickly */
1264b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_ALGO, "schedule dnskey prefetch",
1265b7579f77SDag-Erling Smørgrav 		iq->dp->name, LDNS_RR_TYPE_DNSKEY, iq->qchase.qclass);
1266b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(iq->dp->name, iq->dp->namelen,
1267b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_DNSKEY, iq->qchase.qclass, qstate, id, iq,
1268091e9e46SCy Schubert 		INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0, 0)) {
1269b7579f77SDag-Erling Smørgrav 		/* we'll be slower, but it'll work */
1270b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not generate dnskey prefetch");
1271b7579f77SDag-Erling Smørgrav 		return;
1272b7579f77SDag-Erling Smørgrav 	}
1273b7579f77SDag-Erling Smørgrav 	if(subq) {
1274b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
1275b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
1276b7579f77SDag-Erling Smørgrav 		/* this qstate has the right delegation for the dnskey lookup*/
1277b7579f77SDag-Erling Smørgrav 		/* make copy to avoid use of stub dp by different qs/threads */
1278b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(iq->dp, subq->region);
1279b7579f77SDag-Erling Smørgrav 		/* if !subiq->dp, it'll start from the cache, no problem */
1280b7579f77SDag-Erling Smørgrav 	}
1281b7579f77SDag-Erling Smørgrav }
1282b7579f77SDag-Erling Smørgrav 
1283b7579f77SDag-Erling Smørgrav /**
1284b7579f77SDag-Erling Smørgrav  * See if the query needs forwarding.
1285b7579f77SDag-Erling Smørgrav  *
1286b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1287b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1288b7579f77SDag-Erling Smørgrav  * @return true if the request is forwarded, false if not.
1289b7579f77SDag-Erling Smørgrav  * 	If returns true but, iq->dp is NULL then a malloc failure occurred.
1290b7579f77SDag-Erling Smørgrav  */
1291b7579f77SDag-Erling Smørgrav static int
1292b7579f77SDag-Erling Smørgrav forward_request(struct module_qstate* qstate, struct iter_qstate* iq)
1293b7579f77SDag-Erling Smørgrav {
1294b7579f77SDag-Erling Smørgrav 	struct delegpt* dp;
1295b7579f77SDag-Erling Smørgrav 	uint8_t* delname = iq->qchase.qname;
1296b7579f77SDag-Erling Smørgrav 	size_t delnamelen = iq->qchase.qname_len;
1297a755b6f6SDag-Erling Smørgrav 	if(iq->refetch_glue && iq->dp) {
1298b7579f77SDag-Erling Smørgrav 		delname = iq->dp->name;
1299b7579f77SDag-Erling Smørgrav 		delnamelen = iq->dp->namelen;
1300b7579f77SDag-Erling Smørgrav 	}
1301b7579f77SDag-Erling Smørgrav 	/* strip one label off of DS query to lookup higher for it */
1302b7579f77SDag-Erling Smørgrav 	if( (iq->qchase.qtype == LDNS_RR_TYPE_DS || iq->refetch_glue)
1303b7579f77SDag-Erling Smørgrav 		&& !dname_is_root(iq->qchase.qname))
1304b7579f77SDag-Erling Smørgrav 		dname_remove_label(&delname, &delnamelen);
1305b7579f77SDag-Erling Smørgrav 	dp = forwards_lookup(qstate->env->fwds, delname, iq->qchase.qclass);
1306b7579f77SDag-Erling Smørgrav 	if(!dp)
1307b7579f77SDag-Erling Smørgrav 		return 0;
1308b7579f77SDag-Erling Smørgrav 	/* send recursion desired to forward addr */
1309b7579f77SDag-Erling Smørgrav 	iq->chase_flags |= BIT_RD;
1310b7579f77SDag-Erling Smørgrav 	iq->dp = delegpt_copy(dp, qstate->region);
1311b7579f77SDag-Erling Smørgrav 	/* iq->dp checked by caller */
1312b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "forwarding request");
1313b7579f77SDag-Erling Smørgrav 	return 1;
1314b7579f77SDag-Erling Smørgrav }
1315b7579f77SDag-Erling Smørgrav 
1316b7579f77SDag-Erling Smørgrav /**
1317b7579f77SDag-Erling Smørgrav  * Process the initial part of the request handling. This state roughly
1318b7579f77SDag-Erling Smørgrav  * corresponds to resolver algorithms steps 1 (find answer in cache) and 2
1319b7579f77SDag-Erling Smørgrav  * (find the best servers to ask).
1320b7579f77SDag-Erling Smørgrav  *
1321b7579f77SDag-Erling Smørgrav  * Note that all requests start here, and query restarts revisit this state.
1322b7579f77SDag-Erling Smørgrav  *
1323b7579f77SDag-Erling Smørgrav  * This state either generates: 1) a response, from cache or error, 2) a
1324b7579f77SDag-Erling Smørgrav  * priming event, or 3) forwards the request to the next state (init2,
1325b7579f77SDag-Erling Smørgrav  * generally).
1326b7579f77SDag-Erling Smørgrav  *
1327b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1328b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1329b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
1330b7579f77SDag-Erling Smørgrav  * @param id: module id.
1331b7579f77SDag-Erling Smørgrav  * @return true if the event needs more request processing immediately,
1332b7579f77SDag-Erling Smørgrav  *         false if not.
1333b7579f77SDag-Erling Smørgrav  */
1334b7579f77SDag-Erling Smørgrav static int
1335b7579f77SDag-Erling Smørgrav processInitRequest(struct module_qstate* qstate, struct iter_qstate* iq,
1336b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
1337b7579f77SDag-Erling Smørgrav {
13385469a995SCy Schubert 	uint8_t* delname, *dpname=NULL;
13395469a995SCy Schubert 	size_t delnamelen, dpnamelen=0;
1340bc892140SDag-Erling Smørgrav 	struct dns_msg* msg = NULL;
1341b7579f77SDag-Erling Smørgrav 
1342b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_DETAIL, "resolving", &qstate->qinfo);
1343b7579f77SDag-Erling Smørgrav 	/* check effort */
1344b7579f77SDag-Erling Smørgrav 
1345b7579f77SDag-Erling Smørgrav 	/* We enforce a maximum number of query restarts. This is primarily a
1346b7579f77SDag-Erling Smørgrav 	 * cheap way to prevent CNAME loops. */
13471838dec3SCy Schubert 	if(iq->query_restart_count > ie->max_query_restarts) {
1348b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum number"
1349b7579f77SDag-Erling Smørgrav 			" of query restarts with %d", iq->query_restart_count);
13504c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "request has exceeded the maximum number "
13514c75e3aaSDag-Erling Smørgrav 			"restarts (eg. indirections)");
13524c75e3aaSDag-Erling Smørgrav 		if(iq->qchase.qname)
13534c75e3aaSDag-Erling Smørgrav 			errinf_dname(qstate, "stop at", iq->qchase.qname);
1354b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1355b7579f77SDag-Erling Smørgrav 	}
1356b7579f77SDag-Erling Smørgrav 
1357b7579f77SDag-Erling Smørgrav 	/* We enforce a maximum recursion/dependency depth -- in general,
1358b7579f77SDag-Erling Smørgrav 	 * this is unnecessary for dependency loops (although it will
1359b7579f77SDag-Erling Smørgrav 	 * catch those), but it provides a sensible limit to the amount
1360b7579f77SDag-Erling Smørgrav 	 * of work required to answer a given query. */
1361b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "request has dependency depth of %d", iq->depth);
1362b7579f77SDag-Erling Smørgrav 	if(iq->depth > ie->max_dependency_depth) {
1363b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum "
1364b7579f77SDag-Erling Smørgrav 			"dependency depth with depth of %d", iq->depth);
13654c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "request has exceeded the maximum dependency "
13664c75e3aaSDag-Erling Smørgrav 			"depth (eg. nameserver lookup recursion)");
1367b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1368b7579f77SDag-Erling Smørgrav 	}
1369b7579f77SDag-Erling Smørgrav 
1370b7579f77SDag-Erling Smørgrav 	/* If the request is qclass=ANY, setup to generate each class */
1371b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qclass == LDNS_RR_CLASS_ANY) {
1372b7579f77SDag-Erling Smørgrav 		iq->qchase.qclass = 0;
1373b7579f77SDag-Erling Smørgrav 		return next_state(iq, COLLECT_CLASS_STATE);
1374b7579f77SDag-Erling Smørgrav 	}
1375b7579f77SDag-Erling Smørgrav 
1376c7f4d7adSDag-Erling Smørgrav 	/*
1377c7f4d7adSDag-Erling Smørgrav 	 * If we are restricted by a forward-zone or a stub-zone, we
1378c7f4d7adSDag-Erling Smørgrav 	 * can't re-fetch glue for this delegation point.
1379c7f4d7adSDag-Erling Smørgrav 	 * we won’t try to re-fetch glue if the iq->dp is null.
1380c7f4d7adSDag-Erling Smørgrav 	 */
1381c7f4d7adSDag-Erling Smørgrav 	if (iq->refetch_glue &&
1382c7f4d7adSDag-Erling Smørgrav 	        iq->dp &&
13837da0adf7SDag-Erling Smørgrav 	        !can_have_last_resort(qstate->env, iq->dp->name,
13847da0adf7SDag-Erling Smørgrav 	             iq->dp->namelen, iq->qchase.qclass, NULL)) {
1385c7f4d7adSDag-Erling Smørgrav 	    iq->refetch_glue = 0;
1386c7f4d7adSDag-Erling Smørgrav 	}
1387c7f4d7adSDag-Erling Smørgrav 
1388b7579f77SDag-Erling Smørgrav 	/* Resolver Algorithm Step 1 -- Look for the answer in local data. */
1389b7579f77SDag-Erling Smørgrav 
1390b7579f77SDag-Erling Smørgrav 	/* This either results in a query restart (CNAME cache response), a
1391b7579f77SDag-Erling Smørgrav 	 * terminating response (ANSWER), or a cache miss (null). */
1392b7579f77SDag-Erling Smørgrav 
13935469a995SCy Schubert 	if (iter_stub_fwd_no_cache(qstate, &iq->qchase, &dpname, &dpnamelen)) {
13944c75e3aaSDag-Erling Smørgrav 		/* Asked to not query cache. */
13954c75e3aaSDag-Erling Smørgrav 		verbose(VERB_ALGO, "no-cache set, going to the network");
13964c75e3aaSDag-Erling Smørgrav 		qstate->no_cache_lookup = 1;
13974c75e3aaSDag-Erling Smørgrav 		qstate->no_cache_store = 1;
13984c75e3aaSDag-Erling Smørgrav 		msg = NULL;
13994c75e3aaSDag-Erling Smørgrav 	} else if(qstate->blacklist) {
1400b7579f77SDag-Erling Smørgrav 		/* if cache, or anything else, was blacklisted then
1401b7579f77SDag-Erling Smørgrav 		 * getting older results from cache is a bad idea, no cache */
1402b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "cache blacklisted, going to the network");
1403b7579f77SDag-Erling Smørgrav 		msg = NULL;
1404bc892140SDag-Erling Smørgrav 	} else if(!qstate->no_cache_lookup) {
1405b7579f77SDag-Erling Smørgrav 		msg = dns_cache_lookup(qstate->env, iq->qchase.qname,
1406b7579f77SDag-Erling Smørgrav 			iq->qchase.qname_len, iq->qchase.qtype,
1407ff825849SDag-Erling Smørgrav 			iq->qchase.qclass, qstate->query_flags,
14085469a995SCy Schubert 			qstate->region, qstate->env->scratch, 0, dpname,
14095469a995SCy Schubert 			dpnamelen);
14100fb34990SDag-Erling Smørgrav 		if(!msg && qstate->env->neg_cache &&
14110fb34990SDag-Erling Smørgrav 			iter_qname_indicates_dnssec(qstate->env, &iq->qchase)) {
1412b7579f77SDag-Erling Smørgrav 			/* lookup in negative cache; may result in
1413b7579f77SDag-Erling Smørgrav 			 * NOERROR/NODATA or NXDOMAIN answers that need validation */
1414b7579f77SDag-Erling Smørgrav 			msg = val_neg_getmsg(qstate->env->neg_cache, &iq->qchase,
1415b7579f77SDag-Erling Smørgrav 				qstate->region, qstate->env->rrset_cache,
1416b7579f77SDag-Erling Smørgrav 				qstate->env->scratch_buffer,
141757bddd21SDag-Erling Smørgrav 				*qstate->env->now, 1/*add SOA*/, NULL,
141857bddd21SDag-Erling Smørgrav 				qstate->env->cfg);
1419b7579f77SDag-Erling Smørgrav 		}
1420b7579f77SDag-Erling Smørgrav 		/* item taken from cache does not match our query name, thus
1421b7579f77SDag-Erling Smørgrav 		 * security needs to be re-examined later */
1422b7579f77SDag-Erling Smørgrav 		if(msg && query_dname_compare(qstate->qinfo.qname,
1423b7579f77SDag-Erling Smørgrav 			iq->qchase.qname) != 0)
1424b7579f77SDag-Erling Smørgrav 			msg->rep->security = sec_status_unchecked;
1425b7579f77SDag-Erling Smørgrav 	}
1426b7579f77SDag-Erling Smørgrav 	if(msg) {
1427b7579f77SDag-Erling Smørgrav 		/* handle positive cache response */
1428b7579f77SDag-Erling Smørgrav 		enum response_type type = response_type_from_cache(msg,
1429b7579f77SDag-Erling Smørgrav 			&iq->qchase);
1430b7579f77SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO) {
1431b7579f77SDag-Erling Smørgrav 			log_dns_msg("msg from cache lookup", &msg->qinfo,
1432b7579f77SDag-Erling Smørgrav 				msg->rep);
1433b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "msg ttl is %d, prefetch ttl %d",
1434b7579f77SDag-Erling Smørgrav 				(int)msg->rep->ttl,
1435b7579f77SDag-Erling Smørgrav 				(int)msg->rep->prefetch_ttl);
1436b7579f77SDag-Erling Smørgrav 		}
1437b7579f77SDag-Erling Smørgrav 
1438b7579f77SDag-Erling Smørgrav 		if(type == RESPONSE_TYPE_CNAME) {
1439b7579f77SDag-Erling Smørgrav 			uint8_t* sname = 0;
1440b7579f77SDag-Erling Smørgrav 			size_t slen = 0;
1441b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "returning CNAME response from "
1442b7579f77SDag-Erling Smørgrav 				"cache");
1443b7579f77SDag-Erling Smørgrav 			if(!handle_cname_response(qstate, iq, msg,
14444c75e3aaSDag-Erling Smørgrav 				&sname, &slen)) {
14454c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "failed to prepend CNAME "
14464c75e3aaSDag-Erling Smørgrav 					"components, malloc failure");
1447b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1448b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
14494c75e3aaSDag-Erling Smørgrav 			}
1450b7579f77SDag-Erling Smørgrav 			iq->qchase.qname = sname;
1451b7579f77SDag-Erling Smørgrav 			iq->qchase.qname_len = slen;
1452b7579f77SDag-Erling Smørgrav 			/* This *is* a query restart, even if it is a cheap
1453b7579f77SDag-Erling Smørgrav 			 * one. */
1454b7579f77SDag-Erling Smørgrav 			iq->dp = NULL;
1455b7579f77SDag-Erling Smørgrav 			iq->refetch_glue = 0;
1456b7579f77SDag-Erling Smørgrav 			iq->query_restart_count++;
1457b7579f77SDag-Erling Smørgrav 			iq->sent_count = 0;
1458091e9e46SCy Schubert 			iq->dp_target_count = 0;
1459b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin, NULL, 0, qstate->region);
146005ab2901SDag-Erling Smørgrav 			if(qstate->env->cfg->qname_minimisation)
146105ab2901SDag-Erling Smørgrav 				iq->minimisation_state = INIT_MINIMISE_STATE;
1462b7579f77SDag-Erling Smørgrav 			return next_state(iq, INIT_REQUEST_STATE);
1463b7579f77SDag-Erling Smørgrav 		}
1464b7579f77SDag-Erling Smørgrav 
1465b7579f77SDag-Erling Smørgrav 		/* if from cache, NULL, else insert 'cache IP' len=0 */
1466b7579f77SDag-Erling Smørgrav 		if(qstate->reply_origin)
1467b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin, NULL, 0, qstate->region);
14684c75e3aaSDag-Erling Smørgrav 		if(FLAGS_GET_RCODE(msg->rep->flags) == LDNS_RCODE_SERVFAIL)
14694c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "SERVFAIL in cache");
1470b7579f77SDag-Erling Smørgrav 		/* it is an answer, response, to final state */
1471b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "returning answer from cache.");
1472b7579f77SDag-Erling Smørgrav 		iq->response = msg;
1473b7579f77SDag-Erling Smørgrav 		return final_state(iq);
1474b7579f77SDag-Erling Smørgrav 	}
1475b7579f77SDag-Erling Smørgrav 
1476b7579f77SDag-Erling Smørgrav 	/* attempt to forward the request */
1477b7579f77SDag-Erling Smørgrav 	if(forward_request(qstate, iq))
1478b7579f77SDag-Erling Smørgrav 	{
1479b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
1480b7579f77SDag-Erling Smørgrav 			log_err("alloc failure for forward dp");
14814c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure for forward zone");
1482b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1483b7579f77SDag-Erling Smørgrav 		}
1484*8f76bb7dSCy Schubert 		if((qstate->query_flags&BIT_RD)==0) {
1485*8f76bb7dSCy Schubert 			/* If the server accepts RD=0 queries and forwards
1486*8f76bb7dSCy Schubert 			 * with RD=1, then if the server is listed as an NS
1487*8f76bb7dSCy Schubert 			 * entry, it starts query loops. Stop that loop by
1488*8f76bb7dSCy Schubert 			 * disallowing the query. The RD=0 was previously used
1489*8f76bb7dSCy Schubert 			 * to check the cache with allow_snoop. For stubs,
1490*8f76bb7dSCy Schubert 			 * the iterator pass would have primed the stub and
1491*8f76bb7dSCy Schubert 			 * then cached information can be used for further
1492*8f76bb7dSCy Schubert 			 * queries. */
1493*8f76bb7dSCy Schubert 			verbose(VERB_ALGO, "cannot forward RD=0 query, to stop query loops");
1494*8f76bb7dSCy Schubert 			errinf(qstate, "cannot forward RD=0 query");
1495*8f76bb7dSCy Schubert 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1496*8f76bb7dSCy Schubert 		}
1497b7579f77SDag-Erling Smørgrav 		iq->refetch_glue = 0;
149805ab2901SDag-Erling Smørgrav 		iq->minimisation_state = DONOT_MINIMISE_STATE;
1499b7579f77SDag-Erling Smørgrav 		/* the request has been forwarded.
1500b7579f77SDag-Erling Smørgrav 		 * forwarded requests need to be immediately sent to the
1501b7579f77SDag-Erling Smørgrav 		 * next state, QUERYTARGETS. */
1502b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
1503b7579f77SDag-Erling Smørgrav 	}
1504b7579f77SDag-Erling Smørgrav 
1505b7579f77SDag-Erling Smørgrav 	/* Resolver Algorithm Step 2 -- find the "best" servers. */
1506b7579f77SDag-Erling Smørgrav 
1507b7579f77SDag-Erling Smørgrav 	/* first, adjust for DS queries. To avoid the grandparent problem,
1508b7579f77SDag-Erling Smørgrav 	 * we just look for the closest set of server to the parent of qname.
1509b7579f77SDag-Erling Smørgrav 	 * When re-fetching glue we also need to ask the parent.
1510b7579f77SDag-Erling Smørgrav 	 */
1511b7579f77SDag-Erling Smørgrav 	if(iq->refetch_glue) {
1512b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
1513b7579f77SDag-Erling Smørgrav 			log_err("internal or malloc fail: no dp for refetch");
15144c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, for delegation info");
1515b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1516b7579f77SDag-Erling Smørgrav 		}
1517b7579f77SDag-Erling Smørgrav 		delname = iq->dp->name;
1518b7579f77SDag-Erling Smørgrav 		delnamelen = iq->dp->namelen;
1519b7579f77SDag-Erling Smørgrav 	} else {
1520b7579f77SDag-Erling Smørgrav 		delname = iq->qchase.qname;
1521b7579f77SDag-Erling Smørgrav 		delnamelen = iq->qchase.qname_len;
1522b7579f77SDag-Erling Smørgrav 	}
1523b7579f77SDag-Erling Smørgrav 	if(iq->qchase.qtype == LDNS_RR_TYPE_DS || iq->refetch_glue ||
15240fb34990SDag-Erling Smørgrav 	   (iq->qchase.qtype == LDNS_RR_TYPE_NS && qstate->prefetch_leeway
15257da0adf7SDag-Erling Smørgrav 	   && can_have_last_resort(qstate->env, delname, delnamelen, iq->qchase.qclass, NULL))) {
1526b7579f77SDag-Erling Smørgrav 		/* remove first label from delname, root goes to hints,
1527b7579f77SDag-Erling Smørgrav 		 * but only to fetch glue, not for qtype=DS. */
1528b7579f77SDag-Erling Smørgrav 		/* also when prefetching an NS record, fetch it again from
1529b7579f77SDag-Erling Smørgrav 		 * its parent, just as if it expired, so that you do not
1530b7579f77SDag-Erling Smørgrav 		 * get stuck on an older nameserver that gives old NSrecords */
1531b7579f77SDag-Erling Smørgrav 		if(dname_is_root(delname) && (iq->refetch_glue ||
1532b7579f77SDag-Erling Smørgrav 			(iq->qchase.qtype == LDNS_RR_TYPE_NS &&
1533b7579f77SDag-Erling Smørgrav 			qstate->prefetch_leeway)))
1534b7579f77SDag-Erling Smørgrav 			delname = NULL; /* go to root priming */
1535b7579f77SDag-Erling Smørgrav 		else 	dname_remove_label(&delname, &delnamelen);
1536b7579f77SDag-Erling Smørgrav 	}
1537b7579f77SDag-Erling Smørgrav 	/* delname is the name to lookup a delegation for. If NULL rootprime */
1538b7579f77SDag-Erling Smørgrav 	while(1) {
1539b7579f77SDag-Erling Smørgrav 
1540b7579f77SDag-Erling Smørgrav 		/* Lookup the delegation in the cache. If null, then the
1541b7579f77SDag-Erling Smørgrav 		 * cache needs to be primed for the qclass. */
1542b7579f77SDag-Erling Smørgrav 		if(delname)
1543b7579f77SDag-Erling Smørgrav 		     iq->dp = dns_cache_find_delegation(qstate->env, delname,
1544b7579f77SDag-Erling Smørgrav 			delnamelen, iq->qchase.qtype, iq->qchase.qclass,
1545b7579f77SDag-Erling Smørgrav 			qstate->region, &iq->deleg_msg,
1546790c6b24SCy Schubert 			*qstate->env->now+qstate->prefetch_leeway, 1,
1547790c6b24SCy Schubert 			dpname, dpnamelen);
1548b7579f77SDag-Erling Smørgrav 		else iq->dp = NULL;
1549b7579f77SDag-Erling Smørgrav 
1550b7579f77SDag-Erling Smørgrav 		/* If the cache has returned nothing, then we have a
1551b7579f77SDag-Erling Smørgrav 		 * root priming situation. */
1552b7579f77SDag-Erling Smørgrav 		if(iq->dp == NULL) {
155357bddd21SDag-Erling Smørgrav 			int r;
155457bddd21SDag-Erling Smørgrav 			/* if under auth zone, no prime needed */
155557bddd21SDag-Erling Smørgrav 			if(!auth_zone_delegpt(qstate, iq, delname, delnamelen))
155657bddd21SDag-Erling Smørgrav 				return error_response(qstate, id,
155757bddd21SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
155857bddd21SDag-Erling Smørgrav 			if(iq->dp) /* use auth zone dp */
155957bddd21SDag-Erling Smørgrav 				return next_state(iq, INIT_REQUEST_2_STATE);
1560b7579f77SDag-Erling Smørgrav 			/* if there is a stub, then no root prime needed */
156157bddd21SDag-Erling Smørgrav 			r = prime_stub(qstate, iq, id, delname,
1562b7579f77SDag-Erling Smørgrav 				iq->qchase.qclass);
1563b7579f77SDag-Erling Smørgrav 			if(r == 2)
1564b7579f77SDag-Erling Smørgrav 				break; /* got noprime-stub-zone, continue */
1565b7579f77SDag-Erling Smørgrav 			else if(r)
1566b7579f77SDag-Erling Smørgrav 				return 0; /* stub prime request made */
1567b7579f77SDag-Erling Smørgrav 			if(forwards_lookup_root(qstate->env->fwds,
1568b7579f77SDag-Erling Smørgrav 				iq->qchase.qclass)) {
1569b7579f77SDag-Erling Smørgrav 				/* forward zone root, no root prime needed */
1570b7579f77SDag-Erling Smørgrav 				/* fill in some dp - safety belt */
1571b7579f77SDag-Erling Smørgrav 				iq->dp = hints_lookup_root(qstate->env->hints,
1572b7579f77SDag-Erling Smørgrav 					iq->qchase.qclass);
1573b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1574b7579f77SDag-Erling Smørgrav 					log_err("internal error: no hints dp");
15754c75e3aaSDag-Erling Smørgrav 					errinf(qstate, "no hints for this class");
1576b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1577b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1578b7579f77SDag-Erling Smørgrav 				}
1579b7579f77SDag-Erling Smørgrav 				iq->dp = delegpt_copy(iq->dp, qstate->region);
1580b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1581b7579f77SDag-Erling Smørgrav 					log_err("out of memory in safety belt");
15824c75e3aaSDag-Erling Smørgrav 					errinf(qstate, "malloc failure, in safety belt");
1583b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1584b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1585b7579f77SDag-Erling Smørgrav 				}
1586b7579f77SDag-Erling Smørgrav 				return next_state(iq, INIT_REQUEST_2_STATE);
1587b7579f77SDag-Erling Smørgrav 			}
1588b7579f77SDag-Erling Smørgrav 			/* Note that the result of this will set a new
1589b7579f77SDag-Erling Smørgrav 			 * DelegationPoint based on the result of priming. */
1590b7579f77SDag-Erling Smørgrav 			if(!prime_root(qstate, iq, id, iq->qchase.qclass))
1591b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1592b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_REFUSED);
1593b7579f77SDag-Erling Smørgrav 
1594b7579f77SDag-Erling Smørgrav 			/* priming creates and sends a subordinate query, with
1595b7579f77SDag-Erling Smørgrav 			 * this query as the parent. So further processing for
1596b7579f77SDag-Erling Smørgrav 			 * this event will stop until reactivated by the
1597b7579f77SDag-Erling Smørgrav 			 * results of priming. */
1598b7579f77SDag-Erling Smørgrav 			return 0;
1599b7579f77SDag-Erling Smørgrav 		}
160009a3aaf3SDag-Erling Smørgrav 		if(!iq->ratelimit_ok && qstate->prefetch_leeway)
160109a3aaf3SDag-Erling Smørgrav 			iq->ratelimit_ok = 1; /* allow prefetches, this keeps
160209a3aaf3SDag-Erling Smørgrav 			otherwise valid data in the cache */
1603b7579f77SDag-Erling Smørgrav 
1604b7579f77SDag-Erling Smørgrav 		/* see if this dp not useless.
1605b7579f77SDag-Erling Smørgrav 		 * It is useless if:
1606b7579f77SDag-Erling Smørgrav 		 *	o all NS items are required glue.
1607b7579f77SDag-Erling Smørgrav 		 *	  or the query is for NS item that is required glue.
1608b7579f77SDag-Erling Smørgrav 		 *	o no addresses are provided.
1609b7579f77SDag-Erling Smørgrav 		 *	o RD qflag is on.
1610b7579f77SDag-Erling Smørgrav 		 * Instead, go up one level, and try to get even further
1611b7579f77SDag-Erling Smørgrav 		 * If the root was useless, use safety belt information.
1612b7579f77SDag-Erling Smørgrav 		 * Only check cache returns, because replies for servers
1613b7579f77SDag-Erling Smørgrav 		 * could be useless but lead to loops (bumping into the
1614b7579f77SDag-Erling Smørgrav 		 * same server reply) if useless-checked.
1615b7579f77SDag-Erling Smørgrav 		 */
1616b7579f77SDag-Erling Smørgrav 		if(iter_dp_is_useless(&qstate->qinfo, qstate->query_flags,
1617*8f76bb7dSCy Schubert 			iq->dp, ie->supports_ipv4, ie->supports_ipv6,
1618*8f76bb7dSCy Schubert 			ie->use_nat64)) {
16197da0adf7SDag-Erling Smørgrav 			struct delegpt* retdp = NULL;
16207da0adf7SDag-Erling Smørgrav 			if(!can_have_last_resort(qstate->env, iq->dp->name, iq->dp->namelen, iq->qchase.qclass, &retdp)) {
16217da0adf7SDag-Erling Smørgrav 				if(retdp) {
16227da0adf7SDag-Erling Smørgrav 					verbose(VERB_QUERY, "cache has stub "
16237da0adf7SDag-Erling Smørgrav 						"or fwd but no addresses, "
16247da0adf7SDag-Erling Smørgrav 						"fallback to config");
16257da0adf7SDag-Erling Smørgrav 					iq->dp = delegpt_copy(retdp,
16267da0adf7SDag-Erling Smørgrav 						qstate->region);
16277da0adf7SDag-Erling Smørgrav 					if(!iq->dp) {
16287da0adf7SDag-Erling Smørgrav 						log_err("out of memory in "
16297da0adf7SDag-Erling Smørgrav 							"stub/fwd fallback");
16304c75e3aaSDag-Erling Smørgrav 						errinf(qstate, "malloc failure, for fallback to config");
16317da0adf7SDag-Erling Smørgrav 						return error_response(qstate,
16327da0adf7SDag-Erling Smørgrav 						    id, LDNS_RCODE_SERVFAIL);
16337da0adf7SDag-Erling Smørgrav 					}
16347da0adf7SDag-Erling Smørgrav 					break;
16357da0adf7SDag-Erling Smørgrav 				}
16360fb34990SDag-Erling Smørgrav 				verbose(VERB_ALGO, "useless dp "
16370fb34990SDag-Erling Smørgrav 					"but cannot go up, servfail");
16387da0adf7SDag-Erling Smørgrav 				delegpt_log(VERB_ALGO, iq->dp);
16394c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "no useful nameservers, "
16404c75e3aaSDag-Erling Smørgrav 					"and cannot go up");
16414c75e3aaSDag-Erling Smørgrav 				errinf_dname(qstate, "for zone", iq->dp->name);
16420fb34990SDag-Erling Smørgrav 				return error_response(qstate, id,
16430fb34990SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
16440fb34990SDag-Erling Smørgrav 			}
1645b7579f77SDag-Erling Smørgrav 			if(dname_is_root(iq->dp->name)) {
1646b7579f77SDag-Erling Smørgrav 				/* use safety belt */
1647b7579f77SDag-Erling Smørgrav 				verbose(VERB_QUERY, "Cache has root NS but "
1648b7579f77SDag-Erling Smørgrav 				"no addresses. Fallback to the safety belt.");
1649b7579f77SDag-Erling Smørgrav 				iq->dp = hints_lookup_root(qstate->env->hints,
1650b7579f77SDag-Erling Smørgrav 					iq->qchase.qclass);
1651b7579f77SDag-Erling Smørgrav 				/* note deleg_msg is from previous lookup,
1652b7579f77SDag-Erling Smørgrav 				 * but RD is on, so it is not used */
1653b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1654b7579f77SDag-Erling Smørgrav 					log_err("internal error: no hints dp");
1655b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1656b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_REFUSED);
1657b7579f77SDag-Erling Smørgrav 				}
1658b7579f77SDag-Erling Smørgrav 				iq->dp = delegpt_copy(iq->dp, qstate->region);
1659b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1660b7579f77SDag-Erling Smørgrav 					log_err("out of memory in safety belt");
16614c75e3aaSDag-Erling Smørgrav 					errinf(qstate, "malloc failure, in safety belt, for root");
1662b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1663b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1664b7579f77SDag-Erling Smørgrav 				}
1665b7579f77SDag-Erling Smørgrav 				break;
1666b7579f77SDag-Erling Smørgrav 			} else {
1667b7579f77SDag-Erling Smørgrav 				verbose(VERB_ALGO,
1668b7579f77SDag-Erling Smørgrav 					"cache delegation was useless:");
1669b7579f77SDag-Erling Smørgrav 				delegpt_log(VERB_ALGO, iq->dp);
1670b7579f77SDag-Erling Smørgrav 				/* go up */
1671b7579f77SDag-Erling Smørgrav 				delname = iq->dp->name;
1672b7579f77SDag-Erling Smørgrav 				delnamelen = iq->dp->namelen;
1673b7579f77SDag-Erling Smørgrav 				dname_remove_label(&delname, &delnamelen);
1674b7579f77SDag-Erling Smørgrav 			}
1675b7579f77SDag-Erling Smørgrav 		} else break;
1676b7579f77SDag-Erling Smørgrav 	}
1677b7579f77SDag-Erling Smørgrav 
1678b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "cache delegation returns delegpt");
1679b7579f77SDag-Erling Smørgrav 	delegpt_log(VERB_ALGO, iq->dp);
1680b7579f77SDag-Erling Smørgrav 
1681b7579f77SDag-Erling Smørgrav 	/* Otherwise, set the current delegation point and move on to the
1682b7579f77SDag-Erling Smørgrav 	 * next state. */
1683b7579f77SDag-Erling Smørgrav 	return next_state(iq, INIT_REQUEST_2_STATE);
1684b7579f77SDag-Erling Smørgrav }
1685b7579f77SDag-Erling Smørgrav 
1686b7579f77SDag-Erling Smørgrav /**
1687b7579f77SDag-Erling Smørgrav  * Process the second part of the initial request handling. This state
1688b7579f77SDag-Erling Smørgrav  * basically exists so that queries that generate root priming events have
1689b7579f77SDag-Erling Smørgrav  * the same init processing as ones that do not. Request events that reach
1690b7579f77SDag-Erling Smørgrav  * this state must have a valid currentDelegationPoint set.
1691b7579f77SDag-Erling Smørgrav  *
16928a384985SDag-Erling Smørgrav  * This part is primarily handling stub zone priming. Events that reach this
1693b7579f77SDag-Erling Smørgrav  * state must have a current delegation point.
1694b7579f77SDag-Erling Smørgrav  *
1695b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1696b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1697b7579f77SDag-Erling Smørgrav  * @param id: module id.
1698b7579f77SDag-Erling Smørgrav  * @return true if the event needs more request processing immediately,
1699b7579f77SDag-Erling Smørgrav  *         false if not.
1700b7579f77SDag-Erling Smørgrav  */
1701b7579f77SDag-Erling Smørgrav static int
1702b7579f77SDag-Erling Smørgrav processInitRequest2(struct module_qstate* qstate, struct iter_qstate* iq,
1703b7579f77SDag-Erling Smørgrav 	int id)
1704b7579f77SDag-Erling Smørgrav {
1705b7579f77SDag-Erling Smørgrav 	uint8_t* delname;
1706b7579f77SDag-Erling Smørgrav 	size_t delnamelen;
1707b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "resolving (init part 2): ",
1708b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
1709b7579f77SDag-Erling Smørgrav 
171057bddd21SDag-Erling Smørgrav 	delname = iq->qchase.qname;
171157bddd21SDag-Erling Smørgrav 	delnamelen = iq->qchase.qname_len;
1712b7579f77SDag-Erling Smørgrav 	if(iq->refetch_glue) {
171357bddd21SDag-Erling Smørgrav 		struct iter_hints_stub* stub;
1714b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
1715b7579f77SDag-Erling Smørgrav 			log_err("internal or malloc fail: no dp for refetch");
17164c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, no delegation info");
1717b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1718b7579f77SDag-Erling Smørgrav 		}
171957bddd21SDag-Erling Smørgrav 		/* Do not send queries above stub, do not set delname to dp if
172057bddd21SDag-Erling Smørgrav 		 * this is above stub without stub-first. */
172157bddd21SDag-Erling Smørgrav 		stub = hints_lookup_stub(
172257bddd21SDag-Erling Smørgrav 			qstate->env->hints, iq->qchase.qname, iq->qchase.qclass,
172357bddd21SDag-Erling Smørgrav 			iq->dp);
172457bddd21SDag-Erling Smørgrav 		if(!stub || !stub->dp->has_parent_side_NS ||
172557bddd21SDag-Erling Smørgrav 			dname_subdomain_c(iq->dp->name, stub->dp->name)) {
1726b7579f77SDag-Erling Smørgrav 			delname = iq->dp->name;
1727b7579f77SDag-Erling Smørgrav 			delnamelen = iq->dp->namelen;
172857bddd21SDag-Erling Smørgrav 		}
1729b7579f77SDag-Erling Smørgrav 	}
1730b7579f77SDag-Erling Smørgrav 	if(iq->qchase.qtype == LDNS_RR_TYPE_DS || iq->refetch_glue) {
1731b7579f77SDag-Erling Smørgrav 		if(!dname_is_root(delname))
1732b7579f77SDag-Erling Smørgrav 			dname_remove_label(&delname, &delnamelen);
1733b7579f77SDag-Erling Smørgrav 		iq->refetch_glue = 0; /* if CNAME causes restart, no refetch */
1734b7579f77SDag-Erling Smørgrav 	}
173557bddd21SDag-Erling Smørgrav 
173657bddd21SDag-Erling Smørgrav 	/* see if we have an auth zone to answer from, improves dp from cache
173757bddd21SDag-Erling Smørgrav 	 * (if any dp from cache) with auth zone dp, if that is lower */
173857bddd21SDag-Erling Smørgrav 	if(!auth_zone_delegpt(qstate, iq, delname, delnamelen))
173957bddd21SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
174057bddd21SDag-Erling Smørgrav 
1741b7579f77SDag-Erling Smørgrav 	/* Check to see if we need to prime a stub zone. */
1742b7579f77SDag-Erling Smørgrav 	if(prime_stub(qstate, iq, id, delname, iq->qchase.qclass)) {
1743b7579f77SDag-Erling Smørgrav 		/* A priming sub request was made */
1744b7579f77SDag-Erling Smørgrav 		return 0;
1745b7579f77SDag-Erling Smørgrav 	}
1746b7579f77SDag-Erling Smørgrav 
1747b7579f77SDag-Erling Smørgrav 	/* most events just get forwarded to the next state. */
1748b7579f77SDag-Erling Smørgrav 	return next_state(iq, INIT_REQUEST_3_STATE);
1749b7579f77SDag-Erling Smørgrav }
1750b7579f77SDag-Erling Smørgrav 
1751b7579f77SDag-Erling Smørgrav /**
1752b7579f77SDag-Erling Smørgrav  * Process the third part of the initial request handling. This state exists
1753b7579f77SDag-Erling Smørgrav  * as a separate state so that queries that generate stub priming events
1754b7579f77SDag-Erling Smørgrav  * will get the tail end of the init process but not repeat the stub priming
1755b7579f77SDag-Erling Smørgrav  * check.
1756b7579f77SDag-Erling Smørgrav  *
1757b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1758b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1759b7579f77SDag-Erling Smørgrav  * @param id: module id.
1760b7579f77SDag-Erling Smørgrav  * @return true, advancing the event to the QUERYTARGETS_STATE.
1761b7579f77SDag-Erling Smørgrav  */
1762b7579f77SDag-Erling Smørgrav static int
1763b7579f77SDag-Erling Smørgrav processInitRequest3(struct module_qstate* qstate, struct iter_qstate* iq,
1764b7579f77SDag-Erling Smørgrav 	int id)
1765b7579f77SDag-Erling Smørgrav {
1766b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "resolving (init part 3): ",
1767b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
1768b7579f77SDag-Erling Smørgrav 	/* if the cache reply dp equals a validation anchor or msg has DS,
1769b7579f77SDag-Erling Smørgrav 	 * then DNSSEC RRSIGs are expected in the reply */
1770b7579f77SDag-Erling Smørgrav 	iq->dnssec_expected = iter_indicates_dnssec(qstate->env, iq->dp,
1771b7579f77SDag-Erling Smørgrav 		iq->deleg_msg, iq->qchase.qclass);
1772b7579f77SDag-Erling Smørgrav 
1773b7579f77SDag-Erling Smørgrav 	/* If the RD flag wasn't set, then we just finish with the
1774b7579f77SDag-Erling Smørgrav 	 * cached referral as the response. */
177565b390aaSDag-Erling Smørgrav 	if(!(qstate->query_flags & BIT_RD) && iq->deleg_msg) {
1776b7579f77SDag-Erling Smørgrav 		iq->response = iq->deleg_msg;
177717d15b25SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO && iq->response)
1778b7579f77SDag-Erling Smørgrav 			log_dns_msg("no RD requested, using delegation msg",
1779b7579f77SDag-Erling Smørgrav 				&iq->response->qinfo, iq->response->rep);
1780b7579f77SDag-Erling Smørgrav 		if(qstate->reply_origin)
1781b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin, NULL, 0, qstate->region);
1782b7579f77SDag-Erling Smørgrav 		return final_state(iq);
1783b7579f77SDag-Erling Smørgrav 	}
1784b7579f77SDag-Erling Smørgrav 	/* After this point, unset the RD flag -- this query is going to
1785b7579f77SDag-Erling Smørgrav 	 * be sent to an auth. server. */
1786b7579f77SDag-Erling Smørgrav 	iq->chase_flags &= ~BIT_RD;
1787b7579f77SDag-Erling Smørgrav 
1788b7579f77SDag-Erling Smørgrav 	/* if dnssec expected, fetch key for the trust-anchor or cached-DS */
1789b7579f77SDag-Erling Smørgrav 	if(iq->dnssec_expected && qstate->env->cfg->prefetch_key &&
1790b7579f77SDag-Erling Smørgrav 		!(qstate->query_flags&BIT_CD)) {
1791b7579f77SDag-Erling Smørgrav 		generate_dnskey_prefetch(qstate, iq, id);
1792b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
1793b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
1794b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
1795b7579f77SDag-Erling Smørgrav 	}
1796b7579f77SDag-Erling Smørgrav 
1797b7579f77SDag-Erling Smørgrav 	/* Jump to the next state. */
1798b7579f77SDag-Erling Smørgrav 	return next_state(iq, QUERYTARGETS_STATE);
1799b7579f77SDag-Erling Smørgrav }
1800b7579f77SDag-Erling Smørgrav 
1801b7579f77SDag-Erling Smørgrav /**
1802b7579f77SDag-Erling Smørgrav  * Given a basic query, generate a parent-side "target" query.
1803b7579f77SDag-Erling Smørgrav  * These are subordinate queries for missing delegation point target addresses,
1804b7579f77SDag-Erling Smørgrav  * for which only the parent of the delegation provides correct IP addresses.
1805b7579f77SDag-Erling Smørgrav  *
1806b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1807b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1808b7579f77SDag-Erling Smørgrav  * @param id: module id.
1809b7579f77SDag-Erling Smørgrav  * @param name: target qname.
1810b7579f77SDag-Erling Smørgrav  * @param namelen: target qname length.
1811b7579f77SDag-Erling Smørgrav  * @param qtype: target qtype (either A or AAAA).
1812b7579f77SDag-Erling Smørgrav  * @param qclass: target qclass.
1813b7579f77SDag-Erling Smørgrav  * @return true on success, false on failure.
1814b7579f77SDag-Erling Smørgrav  */
1815b7579f77SDag-Erling Smørgrav static int
1816b7579f77SDag-Erling Smørgrav generate_parentside_target_query(struct module_qstate* qstate,
1817b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq, int id, uint8_t* name, size_t namelen,
1818b7579f77SDag-Erling Smørgrav 	uint16_t qtype, uint16_t qclass)
1819b7579f77SDag-Erling Smørgrav {
1820b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1821b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(name, namelen, qtype, qclass, qstate,
1822091e9e46SCy Schubert 		id, iq, INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0, 0))
1823b7579f77SDag-Erling Smørgrav 		return 0;
1824b7579f77SDag-Erling Smørgrav 	if(subq) {
1825b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
1826b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
1827b7579f77SDag-Erling Smørgrav 		/* blacklist the cache - we want to fetch parent stuff */
1828b7579f77SDag-Erling Smørgrav 		sock_list_insert(&subq->blacklist, NULL, 0, subq->region);
1829b7579f77SDag-Erling Smørgrav 		subiq->query_for_pside_glue = 1;
1830b7579f77SDag-Erling Smørgrav 		if(dname_subdomain_c(name, iq->dp->name)) {
1831b7579f77SDag-Erling Smørgrav 			subiq->dp = delegpt_copy(iq->dp, subq->region);
1832b7579f77SDag-Erling Smørgrav 			subiq->dnssec_expected = iter_indicates_dnssec(
1833b7579f77SDag-Erling Smørgrav 				qstate->env, subiq->dp, NULL,
1834b7579f77SDag-Erling Smørgrav 				subq->qinfo.qclass);
1835b7579f77SDag-Erling Smørgrav 			subiq->refetch_glue = 1;
1836b7579f77SDag-Erling Smørgrav 		} else {
1837b7579f77SDag-Erling Smørgrav 			subiq->dp = dns_cache_find_delegation(qstate->env,
1838b7579f77SDag-Erling Smørgrav 				name, namelen, qtype, qclass, subq->region,
1839b7579f77SDag-Erling Smørgrav 				&subiq->deleg_msg,
1840790c6b24SCy Schubert 				*qstate->env->now+subq->prefetch_leeway,
1841790c6b24SCy Schubert 				1, NULL, 0);
1842b7579f77SDag-Erling Smørgrav 			/* if no dp, then it's from root, refetch unneeded */
1843b7579f77SDag-Erling Smørgrav 			if(subiq->dp) {
1844b7579f77SDag-Erling Smørgrav 				subiq->dnssec_expected = iter_indicates_dnssec(
1845b7579f77SDag-Erling Smørgrav 					qstate->env, subiq->dp, NULL,
1846b7579f77SDag-Erling Smørgrav 					subq->qinfo.qclass);
1847b7579f77SDag-Erling Smørgrav 				subiq->refetch_glue = 1;
1848b7579f77SDag-Erling Smørgrav 			}
1849b7579f77SDag-Erling Smørgrav 		}
1850b7579f77SDag-Erling Smørgrav 	}
1851b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_QUERY, "new pside target", name, qtype, qclass);
1852b7579f77SDag-Erling Smørgrav 	return 1;
1853b7579f77SDag-Erling Smørgrav }
1854b7579f77SDag-Erling Smørgrav 
1855b7579f77SDag-Erling Smørgrav /**
1856b7579f77SDag-Erling Smørgrav  * Given a basic query, generate a "target" query. These are subordinate
1857b7579f77SDag-Erling Smørgrav  * queries for missing delegation point target addresses.
1858b7579f77SDag-Erling Smørgrav  *
1859b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1860b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1861b7579f77SDag-Erling Smørgrav  * @param id: module id.
1862b7579f77SDag-Erling Smørgrav  * @param name: target qname.
1863b7579f77SDag-Erling Smørgrav  * @param namelen: target qname length.
1864b7579f77SDag-Erling Smørgrav  * @param qtype: target qtype (either A or AAAA).
1865b7579f77SDag-Erling Smørgrav  * @param qclass: target qclass.
1866b7579f77SDag-Erling Smørgrav  * @return true on success, false on failure.
1867b7579f77SDag-Erling Smørgrav  */
1868b7579f77SDag-Erling Smørgrav static int
1869b7579f77SDag-Erling Smørgrav generate_target_query(struct module_qstate* qstate, struct iter_qstate* iq,
1870b7579f77SDag-Erling Smørgrav         int id, uint8_t* name, size_t namelen, uint16_t qtype, uint16_t qclass)
1871b7579f77SDag-Erling Smørgrav {
1872b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1873b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(name, namelen, qtype, qclass, qstate,
1874091e9e46SCy Schubert 		id, iq, INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0, 0))
1875b7579f77SDag-Erling Smørgrav 		return 0;
1876b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_QUERY, "new target", name, qtype, qclass);
1877b7579f77SDag-Erling Smørgrav 	return 1;
1878b7579f77SDag-Erling Smørgrav }
1879b7579f77SDag-Erling Smørgrav 
1880b7579f77SDag-Erling Smørgrav /**
1881b7579f77SDag-Erling Smørgrav  * Given an event at a certain state, generate zero or more target queries
1882b7579f77SDag-Erling Smørgrav  * for it's current delegation point.
1883b7579f77SDag-Erling Smørgrav  *
1884b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1885b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1886b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
1887b7579f77SDag-Erling Smørgrav  * @param id: module id.
1888b7579f77SDag-Erling Smørgrav  * @param maxtargets: The maximum number of targets to query for.
1889b7579f77SDag-Erling Smørgrav  *	if it is negative, there is no maximum number of targets.
1890b7579f77SDag-Erling Smørgrav  * @param num: returns the number of queries generated and processed,
1891b7579f77SDag-Erling Smørgrav  *	which may be zero if there were no missing targets.
1892b7579f77SDag-Erling Smørgrav  * @return false on error.
1893b7579f77SDag-Erling Smørgrav  */
1894b7579f77SDag-Erling Smørgrav static int
1895b7579f77SDag-Erling Smørgrav query_for_targets(struct module_qstate* qstate, struct iter_qstate* iq,
1896b7579f77SDag-Erling Smørgrav         struct iter_env* ie, int id, int maxtargets, int* num)
1897b7579f77SDag-Erling Smørgrav {
1898b7579f77SDag-Erling Smørgrav 	int query_count = 0;
1899b7579f77SDag-Erling Smørgrav 	struct delegpt_ns* ns;
1900b7579f77SDag-Erling Smørgrav 	int missing;
1901b7579f77SDag-Erling Smørgrav 	int toget = 0;
1902b7579f77SDag-Erling Smørgrav 
1903a39a5a69SCy Schubert 	iter_mark_cycle_targets(qstate, iq->dp);
19040a92a9fcSCy Schubert 	missing = (int)delegpt_count_missing_targets(iq->dp, NULL);
1905a39a5a69SCy Schubert 	log_assert(maxtargets != 0); /* that would not be useful */
1906a39a5a69SCy Schubert 
1907a39a5a69SCy Schubert 	/* Generate target requests. Basically, any missing targets
1908a39a5a69SCy Schubert 	 * are queried for here, regardless if it is necessary to do
1909a39a5a69SCy Schubert 	 * so to continue processing. */
1910a39a5a69SCy Schubert 	if(maxtargets < 0 || maxtargets > missing)
1911a39a5a69SCy Schubert 		toget = missing;
1912a39a5a69SCy Schubert 	else	toget = maxtargets;
1913a39a5a69SCy Schubert 	if(toget == 0) {
1914a39a5a69SCy Schubert 		*num = 0;
1915a39a5a69SCy Schubert 		return 1;
1916a39a5a69SCy Schubert 	}
1917a39a5a69SCy Schubert 
1918a39a5a69SCy Schubert 	/* now that we are sure that a target query is going to be made,
1919a39a5a69SCy Schubert 	 * check the limits. */
1920b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth)
1921b7579f77SDag-Erling Smørgrav 		return 0;
192252df462fSXin LI 	if(iq->depth > 0 && iq->target_count &&
19230a92a9fcSCy Schubert 		iq->target_count[TARGET_COUNT_QUERIES] > MAX_TARGET_COUNT) {
19246480faa8SDag-Erling Smørgrav 		char s[LDNS_MAX_DOMAINLEN+1];
19256480faa8SDag-Erling Smørgrav 		dname_str(qstate->qinfo.qname, s);
19266480faa8SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request %s has exceeded the maximum "
19270a92a9fcSCy Schubert 			"number of glue fetches %d", s,
19280a92a9fcSCy Schubert 			iq->target_count[TARGET_COUNT_QUERIES]);
192952df462fSXin LI 		return 0;
193052df462fSXin LI 	}
1931091e9e46SCy Schubert 	if(iq->dp_target_count > MAX_DP_TARGET_COUNT) {
1932091e9e46SCy Schubert 		char s[LDNS_MAX_DOMAINLEN+1];
1933091e9e46SCy Schubert 		dname_str(qstate->qinfo.qname, s);
1934091e9e46SCy Schubert 		verbose(VERB_QUERY, "request %s has exceeded the maximum "
1935091e9e46SCy Schubert 			"number of glue fetches %d to a single delegation point",
1936091e9e46SCy Schubert 			s, iq->dp_target_count);
1937091e9e46SCy Schubert 		return 0;
1938091e9e46SCy Schubert 	}
1939b7579f77SDag-Erling Smørgrav 
1940b7579f77SDag-Erling Smørgrav 	/* select 'toget' items from the total of 'missing' items */
1941b7579f77SDag-Erling Smørgrav 	log_assert(toget <= missing);
1942b7579f77SDag-Erling Smørgrav 
1943b7579f77SDag-Erling Smørgrav 	/* loop over missing targets */
1944b7579f77SDag-Erling Smørgrav 	for(ns = iq->dp->nslist; ns; ns = ns->next) {
1945b7579f77SDag-Erling Smørgrav 		if(ns->resolved)
1946b7579f77SDag-Erling Smørgrav 			continue;
1947b7579f77SDag-Erling Smørgrav 
1948b7579f77SDag-Erling Smørgrav 		/* randomly select this item with probability toget/missing */
1949b7579f77SDag-Erling Smørgrav 		if(!iter_ns_probability(qstate->env->rnd, toget, missing)) {
1950b7579f77SDag-Erling Smørgrav 			/* do not select this one, next; select toget number
1951b7579f77SDag-Erling Smørgrav 			 * of items from a list one less in size */
1952b7579f77SDag-Erling Smørgrav 			missing --;
1953b7579f77SDag-Erling Smørgrav 			continue;
1954b7579f77SDag-Erling Smørgrav 		}
1955b7579f77SDag-Erling Smørgrav 
19560a92a9fcSCy Schubert 		if(ie->supports_ipv6 &&
19570a92a9fcSCy Schubert 			((ns->lame && !ns->done_pside6) ||
19580a92a9fcSCy Schubert 			(!ns->lame && !ns->got6))) {
1959b7579f77SDag-Erling Smørgrav 			/* Send the AAAA request. */
1960b7579f77SDag-Erling Smørgrav 			if(!generate_target_query(qstate, iq, id,
1961b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
1962b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_AAAA, iq->qchase.qclass)) {
1963b7579f77SDag-Erling Smørgrav 				*num = query_count;
1964b7579f77SDag-Erling Smørgrav 				if(query_count > 0)
1965b7579f77SDag-Erling Smørgrav 					qstate->ext_state[id] = module_wait_subquery;
1966b7579f77SDag-Erling Smørgrav 				return 0;
1967b7579f77SDag-Erling Smørgrav 			}
1968b7579f77SDag-Erling Smørgrav 			query_count++;
19694f5c8956SCy Schubert 			/* If the mesh query list is full, exit the loop here.
19704f5c8956SCy Schubert 			 * This makes the routine spawn one query at a time,
19714f5c8956SCy Schubert 			 * and this means there is no query state load
19724f5c8956SCy Schubert 			 * increase, because the spawned state uses cpu and a
19734f5c8956SCy Schubert 			 * socket while this state waits for that spawned
19744f5c8956SCy Schubert 			 * state. Next time we can look up further targets */
19754f5c8956SCy Schubert 			if(mesh_jostle_exceeded(qstate->env->mesh))
19764f5c8956SCy Schubert 				break;
1977b7579f77SDag-Erling Smørgrav 		}
1978b7579f77SDag-Erling Smørgrav 		/* Send the A request. */
1979*8f76bb7dSCy Schubert 		if((ie->supports_ipv4 || ie->use_nat64) &&
19800a92a9fcSCy Schubert 			((ns->lame && !ns->done_pside4) ||
19810a92a9fcSCy Schubert 			(!ns->lame && !ns->got4))) {
1982b7579f77SDag-Erling Smørgrav 			if(!generate_target_query(qstate, iq, id,
1983b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
1984b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_A, iq->qchase.qclass)) {
1985b7579f77SDag-Erling Smørgrav 				*num = query_count;
1986b7579f77SDag-Erling Smørgrav 				if(query_count > 0)
1987b7579f77SDag-Erling Smørgrav 					qstate->ext_state[id] = module_wait_subquery;
1988b7579f77SDag-Erling Smørgrav 				return 0;
1989b7579f77SDag-Erling Smørgrav 			}
1990b7579f77SDag-Erling Smørgrav 			query_count++;
19914f5c8956SCy Schubert 			/* If the mesh query list is full, exit the loop. */
19924f5c8956SCy Schubert 			if(mesh_jostle_exceeded(qstate->env->mesh))
19934f5c8956SCy Schubert 				break;
1994b7579f77SDag-Erling Smørgrav 		}
1995b7579f77SDag-Erling Smørgrav 
1996b7579f77SDag-Erling Smørgrav 		/* mark this target as in progress. */
1997b7579f77SDag-Erling Smørgrav 		ns->resolved = 1;
1998b7579f77SDag-Erling Smørgrav 		missing--;
1999b7579f77SDag-Erling Smørgrav 		toget--;
2000b7579f77SDag-Erling Smørgrav 		if(toget == 0)
2001b7579f77SDag-Erling Smørgrav 			break;
2002b7579f77SDag-Erling Smørgrav 	}
2003b7579f77SDag-Erling Smørgrav 	*num = query_count;
2004b7579f77SDag-Erling Smørgrav 	if(query_count > 0)
2005b7579f77SDag-Erling Smørgrav 		qstate->ext_state[id] = module_wait_subquery;
2006b7579f77SDag-Erling Smørgrav 
2007b7579f77SDag-Erling Smørgrav 	return 1;
2008b7579f77SDag-Erling Smørgrav }
2009b7579f77SDag-Erling Smørgrav 
2010b7579f77SDag-Erling Smørgrav /**
2011b7579f77SDag-Erling Smørgrav  * Called by processQueryTargets when it would like extra targets to query
2012b7579f77SDag-Erling Smørgrav  * but it seems to be out of options.  At last resort some less appealing
2013b7579f77SDag-Erling Smørgrav  * options are explored.  If there are no more options, the result is SERVFAIL
2014b7579f77SDag-Erling Smørgrav  *
2015b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2016b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
2017b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
2018b7579f77SDag-Erling Smørgrav  * @param id: module id.
2019b7579f77SDag-Erling Smørgrav  * @return true if the event requires more request processing immediately,
2020b7579f77SDag-Erling Smørgrav  *         false if not.
2021b7579f77SDag-Erling Smørgrav  */
2022b7579f77SDag-Erling Smørgrav static int
2023b7579f77SDag-Erling Smørgrav processLastResort(struct module_qstate* qstate, struct iter_qstate* iq,
2024b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
2025b7579f77SDag-Erling Smørgrav {
2026b7579f77SDag-Erling Smørgrav 	struct delegpt_ns* ns;
2027b7579f77SDag-Erling Smørgrav 	int query_count = 0;
2028b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "No more query targets, attempting last resort");
2029b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
2030b7579f77SDag-Erling Smørgrav 
2031c7f4d7adSDag-Erling Smørgrav 	if(!can_have_last_resort(qstate->env, iq->dp->name, iq->dp->namelen,
20327da0adf7SDag-Erling Smørgrav 		iq->qchase.qclass, NULL)) {
203317d15b25SDag-Erling Smørgrav 		/* fail -- no more targets, no more hope of targets, no hope
203417d15b25SDag-Erling Smørgrav 		 * of a response. */
20354c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "all the configured stub or forward servers failed,");
20364c75e3aaSDag-Erling Smørgrav 		errinf_dname(qstate, "at zone", iq->dp->name);
20375469a995SCy Schubert 		errinf_reply(qstate, iq);
2038c7f4d7adSDag-Erling Smørgrav 		verbose(VERB_QUERY, "configured stub or forward servers failed -- returning SERVFAIL");
203917d15b25SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
204017d15b25SDag-Erling Smørgrav 	}
20418ed2b524SDag-Erling Smørgrav 	if(!iq->dp->has_parent_side_NS && dname_is_root(iq->dp->name)) {
20428ed2b524SDag-Erling Smørgrav 		struct delegpt* p = hints_lookup_root(qstate->env->hints,
20438ed2b524SDag-Erling Smørgrav 			iq->qchase.qclass);
20448ed2b524SDag-Erling Smørgrav 		if(p) {
20458ed2b524SDag-Erling Smørgrav 			struct delegpt_addr* a;
20468ed2b524SDag-Erling Smørgrav 			iq->chase_flags &= ~BIT_RD; /* go to authorities */
20478ed2b524SDag-Erling Smørgrav 			for(ns = p->nslist; ns; ns=ns->next) {
20488ed2b524SDag-Erling Smørgrav 				(void)delegpt_add_ns(iq->dp, qstate->region,
20499cf5bc93SCy Schubert 					ns->name, ns->lame, ns->tls_auth_name,
20509cf5bc93SCy Schubert 					ns->port);
20518ed2b524SDag-Erling Smørgrav 			}
20528ed2b524SDag-Erling Smørgrav 			for(a = p->target_list; a; a=a->next_target) {
20538ed2b524SDag-Erling Smørgrav 				(void)delegpt_add_addr(iq->dp, qstate->region,
20548ed2b524SDag-Erling Smørgrav 					&a->addr, a->addrlen, a->bogus,
20559cf5bc93SCy Schubert 					a->lame, a->tls_auth_name, -1, NULL);
20568ed2b524SDag-Erling Smørgrav 			}
20578ed2b524SDag-Erling Smørgrav 		}
20588ed2b524SDag-Erling Smørgrav 		iq->dp->has_parent_side_NS = 1;
20598ed2b524SDag-Erling Smørgrav 	} else if(!iq->dp->has_parent_side_NS) {
2060b7579f77SDag-Erling Smørgrav 		if(!iter_lookup_parent_NS_from_cache(qstate->env, iq->dp,
2061b7579f77SDag-Erling Smørgrav 			qstate->region, &qstate->qinfo)
2062b7579f77SDag-Erling Smørgrav 			|| !iq->dp->has_parent_side_NS) {
2063b7579f77SDag-Erling Smørgrav 			/* if: malloc failure in lookup go up to try */
2064b7579f77SDag-Erling Smørgrav 			/* if: no parent NS in cache - go up one level */
2065b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "try to grab parent NS");
2066b7579f77SDag-Erling Smørgrav 			iq->store_parent_NS = iq->dp;
20678ed2b524SDag-Erling Smørgrav 			iq->chase_flags &= ~BIT_RD; /* go to authorities */
2068b7579f77SDag-Erling Smørgrav 			iq->deleg_msg = NULL;
2069b7579f77SDag-Erling Smørgrav 			iq->refetch_glue = 1;
2070b7579f77SDag-Erling Smørgrav 			iq->query_restart_count++;
2071b7579f77SDag-Erling Smørgrav 			iq->sent_count = 0;
2072091e9e46SCy Schubert 			iq->dp_target_count = 0;
207305ab2901SDag-Erling Smørgrav 			if(qstate->env->cfg->qname_minimisation)
207405ab2901SDag-Erling Smørgrav 				iq->minimisation_state = INIT_MINIMISE_STATE;
2075b7579f77SDag-Erling Smørgrav 			return next_state(iq, INIT_REQUEST_STATE);
2076b7579f77SDag-Erling Smørgrav 		}
2077b7579f77SDag-Erling Smørgrav 	}
2078b7579f77SDag-Erling Smørgrav 	/* see if that makes new names available */
2079b7579f77SDag-Erling Smørgrav 	if(!cache_fill_missing(qstate->env, iq->qchase.qclass,
2080b7579f77SDag-Erling Smørgrav 		qstate->region, iq->dp))
2081b7579f77SDag-Erling Smørgrav 		log_err("out of memory in cache_fill_missing");
2082b7579f77SDag-Erling Smørgrav 	if(iq->dp->usable_list) {
2083b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "try parent-side-name, w. glue from cache");
2084b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2085b7579f77SDag-Erling Smørgrav 	}
2086b7579f77SDag-Erling Smørgrav 	/* try to fill out parent glue from cache */
2087b7579f77SDag-Erling Smørgrav 	if(iter_lookup_parent_glue_from_cache(qstate->env, iq->dp,
2088b7579f77SDag-Erling Smørgrav 		qstate->region, &qstate->qinfo)) {
2089b7579f77SDag-Erling Smørgrav 		/* got parent stuff from cache, see if we can continue */
2090b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "try parent-side glue from cache");
2091b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2092b7579f77SDag-Erling Smørgrav 	}
2093b7579f77SDag-Erling Smørgrav 	/* query for an extra name added by the parent-NS record */
20940a92a9fcSCy Schubert 	if(delegpt_count_missing_targets(iq->dp, NULL) > 0) {
2095b7579f77SDag-Erling Smørgrav 		int qs = 0;
2096b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "try parent-side target name");
2097b7579f77SDag-Erling Smørgrav 		if(!query_for_targets(qstate, iq, ie, id, 1, &qs)) {
20984c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "could not fetch nameserver");
20994c75e3aaSDag-Erling Smørgrav 			errinf_dname(qstate, "at zone", iq->dp->name);
2100b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2101b7579f77SDag-Erling Smørgrav 		}
2102b7579f77SDag-Erling Smørgrav 		iq->num_target_queries += qs;
210352df462fSXin LI 		target_count_increase(iq, qs);
2104b7579f77SDag-Erling Smørgrav 		if(qs != 0) {
2105b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_subquery;
2106b7579f77SDag-Erling Smørgrav 			return 0; /* and wait for them */
2107b7579f77SDag-Erling Smørgrav 		}
2108b7579f77SDag-Erling Smørgrav 	}
2109b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth) {
2110b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "maxdepth and need more nameservers, fail");
21114c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "cannot fetch more nameservers because at max dependency depth");
2112b7579f77SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
2113b7579f77SDag-Erling Smørgrav 	}
211452df462fSXin LI 	if(iq->depth > 0 && iq->target_count &&
21150a92a9fcSCy Schubert 		iq->target_count[TARGET_COUNT_QUERIES] > MAX_TARGET_COUNT) {
21166480faa8SDag-Erling Smørgrav 		char s[LDNS_MAX_DOMAINLEN+1];
21176480faa8SDag-Erling Smørgrav 		dname_str(qstate->qinfo.qname, s);
21186480faa8SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request %s has exceeded the maximum "
21190a92a9fcSCy Schubert 			"number of glue fetches %d", s,
21200a92a9fcSCy Schubert 			iq->target_count[TARGET_COUNT_QUERIES]);
21214c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "exceeded the maximum number of glue fetches");
212252df462fSXin LI 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
212352df462fSXin LI 	}
2124b7579f77SDag-Erling Smørgrav 	/* mark cycle targets for parent-side lookups */
2125b7579f77SDag-Erling Smørgrav 	iter_mark_pside_cycle_targets(qstate, iq->dp);
2126b7579f77SDag-Erling Smørgrav 	/* see if we can issue queries to get nameserver addresses */
2127b7579f77SDag-Erling Smørgrav 	/* this lookup is not randomized, but sequential. */
2128b7579f77SDag-Erling Smørgrav 	for(ns = iq->dp->nslist; ns; ns = ns->next) {
2129c7f4d7adSDag-Erling Smørgrav 		/* if this nameserver is at a delegation point, but that
2130c7f4d7adSDag-Erling Smørgrav 		 * delegation point is a stub and we cannot go higher, skip*/
2131c7f4d7adSDag-Erling Smørgrav 		if( ((ie->supports_ipv6 && !ns->done_pside6) ||
2132*8f76bb7dSCy Schubert 		    ((ie->supports_ipv4 || ie->use_nat64) && !ns->done_pside4)) &&
2133c7f4d7adSDag-Erling Smørgrav 		    !can_have_last_resort(qstate->env, ns->name, ns->namelen,
21347da0adf7SDag-Erling Smørgrav 			iq->qchase.qclass, NULL)) {
2135c7f4d7adSDag-Erling Smørgrav 			log_nametypeclass(VERB_ALGO, "cannot pside lookup ns "
2136c7f4d7adSDag-Erling Smørgrav 				"because it is also a stub/forward,",
2137c7f4d7adSDag-Erling Smørgrav 				ns->name, LDNS_RR_TYPE_NS, iq->qchase.qclass);
2138c7f4d7adSDag-Erling Smørgrav 			if(ie->supports_ipv6) ns->done_pside6 = 1;
2139*8f76bb7dSCy Schubert 			if(ie->supports_ipv4 || ie->use_nat64) ns->done_pside4 = 1;
2140c7f4d7adSDag-Erling Smørgrav 			continue;
2141c7f4d7adSDag-Erling Smørgrav 		}
2142b7579f77SDag-Erling Smørgrav 		/* query for parent-side A and AAAA for nameservers */
2143b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv6 && !ns->done_pside6) {
2144b7579f77SDag-Erling Smørgrav 			/* Send the AAAA request. */
2145b7579f77SDag-Erling Smørgrav 			if(!generate_parentside_target_query(qstate, iq, id,
2146b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
21474c75e3aaSDag-Erling Smørgrav 				LDNS_RR_TYPE_AAAA, iq->qchase.qclass)) {
21484c75e3aaSDag-Erling Smørgrav 				errinf_dname(qstate, "could not generate nameserver AAAA lookup for", ns->name);
2149b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
2150b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
21514c75e3aaSDag-Erling Smørgrav 			}
2152b7579f77SDag-Erling Smørgrav 			ns->done_pside6 = 1;
2153b7579f77SDag-Erling Smørgrav 			query_count++;
21544f5c8956SCy Schubert 			if(mesh_jostle_exceeded(qstate->env->mesh)) {
21554f5c8956SCy Schubert 				/* Wait for the lookup; do not spawn multiple
21564f5c8956SCy Schubert 				 * lookups at a time. */
21574f5c8956SCy Schubert 				verbose(VERB_ALGO, "try parent-side glue lookup");
21584f5c8956SCy Schubert 				iq->num_target_queries += query_count;
21594f5c8956SCy Schubert 				target_count_increase(iq, query_count);
21604f5c8956SCy Schubert 				qstate->ext_state[id] = module_wait_subquery;
21614f5c8956SCy Schubert 				return 0;
21624f5c8956SCy Schubert 			}
2163b7579f77SDag-Erling Smørgrav 		}
2164*8f76bb7dSCy Schubert 		if((ie->supports_ipv4 || ie->use_nat64) && !ns->done_pside4) {
2165b7579f77SDag-Erling Smørgrav 			/* Send the A request. */
2166b7579f77SDag-Erling Smørgrav 			if(!generate_parentside_target_query(qstate, iq, id,
2167b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
21684c75e3aaSDag-Erling Smørgrav 				LDNS_RR_TYPE_A, iq->qchase.qclass)) {
21694c75e3aaSDag-Erling Smørgrav 				errinf_dname(qstate, "could not generate nameserver A lookup for", ns->name);
2170b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
2171b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
21724c75e3aaSDag-Erling Smørgrav 			}
2173b7579f77SDag-Erling Smørgrav 			ns->done_pside4 = 1;
2174b7579f77SDag-Erling Smørgrav 			query_count++;
2175b7579f77SDag-Erling Smørgrav 		}
2176b7579f77SDag-Erling Smørgrav 		if(query_count != 0) { /* suspend to await results */
2177b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "try parent-side glue lookup");
2178b7579f77SDag-Erling Smørgrav 			iq->num_target_queries += query_count;
217952df462fSXin LI 			target_count_increase(iq, query_count);
2180b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_subquery;
2181b7579f77SDag-Erling Smørgrav 			return 0;
2182b7579f77SDag-Erling Smørgrav 		}
2183b7579f77SDag-Erling Smørgrav 	}
2184b7579f77SDag-Erling Smørgrav 
2185b7579f77SDag-Erling Smørgrav 	/* if this was a parent-side glue query itself, then store that
2186b7579f77SDag-Erling Smørgrav 	 * failure in cache. */
2187bc892140SDag-Erling Smørgrav 	if(!qstate->no_cache_store && iq->query_for_pside_glue
2188bc892140SDag-Erling Smørgrav 		&& !iq->pside_glue)
2189b7579f77SDag-Erling Smørgrav 			iter_store_parentside_neg(qstate->env, &qstate->qinfo,
2190b7579f77SDag-Erling Smørgrav 				iq->deleg_msg?iq->deleg_msg->rep:
2191b7579f77SDag-Erling Smørgrav 				(iq->response?iq->response->rep:NULL));
2192b7579f77SDag-Erling Smørgrav 
21934c75e3aaSDag-Erling Smørgrav 	errinf(qstate, "all servers for this domain failed,");
21944c75e3aaSDag-Erling Smørgrav 	errinf_dname(qstate, "at zone", iq->dp->name);
21955469a995SCy Schubert 	errinf_reply(qstate, iq);
2196b7579f77SDag-Erling Smørgrav 	verbose(VERB_QUERY, "out of query targets -- returning SERVFAIL");
2197b7579f77SDag-Erling Smørgrav 	/* fail -- no more targets, no more hope of targets, no hope
2198b7579f77SDag-Erling Smørgrav 	 * of a response. */
2199b7579f77SDag-Erling Smørgrav 	return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
2200b7579f77SDag-Erling Smørgrav }
2201b7579f77SDag-Erling Smørgrav 
2202b7579f77SDag-Erling Smørgrav /**
2203b7579f77SDag-Erling Smørgrav  * Try to find the NS record set that will resolve a qtype DS query. Due
2204b7579f77SDag-Erling Smørgrav  * to grandparent/grandchild reasons we did not get a proper lookup right
2205b7579f77SDag-Erling Smørgrav  * away.  We need to create type NS queries until we get the right parent
2206b7579f77SDag-Erling Smørgrav  * for this lookup.  We remove labels from the query to find the right point.
2207b7579f77SDag-Erling Smørgrav  * If we end up at the old dp name, then there is no solution.
2208b7579f77SDag-Erling Smørgrav  *
2209b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2210b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
2211b7579f77SDag-Erling Smørgrav  * @param id: module id.
2212b7579f77SDag-Erling Smørgrav  * @return true if the event requires more immediate processing, false if
2213b7579f77SDag-Erling Smørgrav  *         not. This is generally only true when forwarding the request to
2214b7579f77SDag-Erling Smørgrav  *         the final state (i.e., on answer).
2215b7579f77SDag-Erling Smørgrav  */
2216b7579f77SDag-Erling Smørgrav static int
22178ed2b524SDag-Erling Smørgrav processDSNSFind(struct module_qstate* qstate, struct iter_qstate* iq, int id)
2218b7579f77SDag-Erling Smørgrav {
2219b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq = NULL;
2220b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "processDSNSFind");
2221b7579f77SDag-Erling Smørgrav 
2222b7579f77SDag-Erling Smørgrav 	if(!iq->dsns_point) {
2223b7579f77SDag-Erling Smørgrav 		/* initialize */
2224b7579f77SDag-Erling Smørgrav 		iq->dsns_point = iq->qchase.qname;
2225b7579f77SDag-Erling Smørgrav 		iq->dsns_point_len = iq->qchase.qname_len;
2226b7579f77SDag-Erling Smørgrav 	}
2227b7579f77SDag-Erling Smørgrav 	/* robustcheck for internal error: we are not underneath the dp */
2228b7579f77SDag-Erling Smørgrav 	if(!dname_subdomain_c(iq->dsns_point, iq->dp->name)) {
22294c75e3aaSDag-Erling Smørgrav 		errinf_dname(qstate, "for DS query parent-child nameserver search the query is not under the zone", iq->dp->name);
2230b7579f77SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
2231b7579f77SDag-Erling Smørgrav 	}
2232b7579f77SDag-Erling Smørgrav 
2233b7579f77SDag-Erling Smørgrav 	/* go up one (more) step, until we hit the dp, if so, end */
2234b7579f77SDag-Erling Smørgrav 	dname_remove_label(&iq->dsns_point, &iq->dsns_point_len);
2235b7579f77SDag-Erling Smørgrav 	if(query_dname_compare(iq->dsns_point, iq->dp->name) == 0) {
2236b7579f77SDag-Erling Smørgrav 		/* there was no inbetween nameserver, use the old delegation
2237b7579f77SDag-Erling Smørgrav 		 * point again.  And this time, because dsns_point is nonNULL
2238b7579f77SDag-Erling Smørgrav 		 * we are going to accept the (bad) result */
2239b7579f77SDag-Erling Smørgrav 		iq->state = QUERYTARGETS_STATE;
2240b7579f77SDag-Erling Smørgrav 		return 1;
2241b7579f77SDag-Erling Smørgrav 	}
2242b7579f77SDag-Erling Smørgrav 	iq->state = DSNS_FIND_STATE;
2243b7579f77SDag-Erling Smørgrav 
2244b7579f77SDag-Erling Smørgrav 	/* spawn NS lookup (validation not needed, this is for DS lookup) */
2245b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_ALGO, "fetch nameservers",
2246b7579f77SDag-Erling Smørgrav 		iq->dsns_point, LDNS_RR_TYPE_NS, iq->qchase.qclass);
2247b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(iq->dsns_point, iq->dsns_point_len,
2248b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, iq->qchase.qclass, qstate, id, iq,
2249091e9e46SCy Schubert 		INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0, 0)) {
22504c75e3aaSDag-Erling Smørgrav 		errinf_dname(qstate, "for DS query parent-child nameserver search, could not generate NS lookup for", iq->dsns_point);
2251b7579f77SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
2252b7579f77SDag-Erling Smørgrav 	}
2253b7579f77SDag-Erling Smørgrav 
2254b7579f77SDag-Erling Smørgrav 	return 0;
2255b7579f77SDag-Erling Smørgrav }
2256b7579f77SDag-Erling Smørgrav 
2257b7579f77SDag-Erling Smørgrav /**
22580a92a9fcSCy Schubert  * Check if we wait responses for sent queries and update the iterator's
22590a92a9fcSCy Schubert  * external state.
22600a92a9fcSCy Schubert  */
22610a92a9fcSCy Schubert static void
22620a92a9fcSCy Schubert check_waiting_queries(struct iter_qstate* iq, struct module_qstate* qstate,
22630a92a9fcSCy Schubert 	int id)
22640a92a9fcSCy Schubert {
22650a92a9fcSCy Schubert 	if(iq->num_target_queries>0 && iq->num_current_queries>0) {
22660a92a9fcSCy Schubert 		verbose(VERB_ALGO, "waiting for %d targets to "
22670a92a9fcSCy Schubert 			"resolve or %d outstanding queries to "
22680a92a9fcSCy Schubert 			"respond", iq->num_target_queries,
22690a92a9fcSCy Schubert 			iq->num_current_queries);
22700a92a9fcSCy Schubert 		qstate->ext_state[id] = module_wait_reply;
22710a92a9fcSCy Schubert 	} else if(iq->num_target_queries>0) {
22720a92a9fcSCy Schubert 		verbose(VERB_ALGO, "waiting for %d targets to "
22730a92a9fcSCy Schubert 			"resolve", iq->num_target_queries);
22740a92a9fcSCy Schubert 		qstate->ext_state[id] = module_wait_subquery;
22750a92a9fcSCy Schubert 	} else {
22760a92a9fcSCy Schubert 		verbose(VERB_ALGO, "waiting for %d "
22770a92a9fcSCy Schubert 			"outstanding queries to respond",
22780a92a9fcSCy Schubert 			iq->num_current_queries);
22790a92a9fcSCy Schubert 		qstate->ext_state[id] = module_wait_reply;
22800a92a9fcSCy Schubert 	}
22810a92a9fcSCy Schubert }
22820a92a9fcSCy Schubert 
22830a92a9fcSCy Schubert /**
2284b7579f77SDag-Erling Smørgrav  * This is the request event state where the request will be sent to one of
2285b7579f77SDag-Erling Smørgrav  * its current query targets. This state also handles issuing target lookup
2286b7579f77SDag-Erling Smørgrav  * queries for missing target IP addresses. Queries typically iterate on
2287b7579f77SDag-Erling Smørgrav  * this state, both when they are just trying different targets for a given
2288b7579f77SDag-Erling Smørgrav  * delegation point, and when they change delegation points. This state
2289b7579f77SDag-Erling Smørgrav  * roughly corresponds to RFC 1034 algorithm steps 3 and 4.
2290b7579f77SDag-Erling Smørgrav  *
2291b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2292b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
2293b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
2294b7579f77SDag-Erling Smørgrav  * @param id: module id.
2295b7579f77SDag-Erling Smørgrav  * @return true if the event requires more request processing immediately,
2296b7579f77SDag-Erling Smørgrav  *         false if not. This state only returns true when it is generating
2297b7579f77SDag-Erling Smørgrav  *         a SERVFAIL response because the query has hit a dead end.
2298b7579f77SDag-Erling Smørgrav  */
2299b7579f77SDag-Erling Smørgrav static int
2300b7579f77SDag-Erling Smørgrav processQueryTargets(struct module_qstate* qstate, struct iter_qstate* iq,
2301b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
2302b7579f77SDag-Erling Smørgrav {
2303b7579f77SDag-Erling Smørgrav 	int tf_policy;
2304b7579f77SDag-Erling Smørgrav 	struct delegpt_addr* target;
2305b7579f77SDag-Erling Smørgrav 	struct outbound_entry* outq;
2306*8f76bb7dSCy Schubert 	struct sockaddr_storage real_addr;
2307*8f76bb7dSCy Schubert 	socklen_t real_addrlen;
230857bddd21SDag-Erling Smørgrav 	int auth_fallback = 0;
2309e86b9096SDag-Erling Smørgrav 	uint8_t* qout_orig = NULL;
2310e86b9096SDag-Erling Smørgrav 	size_t qout_orig_len = 0;
23119cf5bc93SCy Schubert 	int sq_check_ratelimit = 1;
23129cf5bc93SCy Schubert 	int sq_was_ratelimited = 0;
2313865f46b2SCy Schubert 	int can_do_promisc = 0;
2314b7579f77SDag-Erling Smørgrav 
2315b7579f77SDag-Erling Smørgrav 	/* NOTE: a request will encounter this state for each target it
2316b7579f77SDag-Erling Smørgrav 	 * needs to send a query to. That is, at least one per referral,
2317b7579f77SDag-Erling Smørgrav 	 * more if some targets timeout or return throwaway answers. */
2318b7579f77SDag-Erling Smørgrav 
2319b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "processQueryTargets:", &qstate->qinfo);
2320b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "processQueryTargets: targetqueries %d, "
2321b7579f77SDag-Erling Smørgrav 		"currentqueries %d sentcount %d", iq->num_target_queries,
2322b7579f77SDag-Erling Smørgrav 		iq->num_current_queries, iq->sent_count);
2323b7579f77SDag-Erling Smørgrav 
2324b7579f77SDag-Erling Smørgrav 	/* Make sure that we haven't run away */
2325b7579f77SDag-Erling Smørgrav 	if(iq->referral_count > MAX_REFERRAL_COUNT) {
2326b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum "
2327b7579f77SDag-Erling Smørgrav 			"number of referrrals with %d", iq->referral_count);
23284c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "exceeded the maximum of referrals");
2329b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2330b7579f77SDag-Erling Smørgrav 	}
23311838dec3SCy Schubert 	if(iq->sent_count > ie->max_sent_count) {
2332b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum "
2333b7579f77SDag-Erling Smørgrav 			"number of sends with %d", iq->sent_count);
23344c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "exceeded the maximum number of sends");
2335b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2336b7579f77SDag-Erling Smørgrav 	}
23370a92a9fcSCy Schubert 
23380a92a9fcSCy Schubert 	/* Check if we reached MAX_TARGET_NX limit without a fallback activation. */
23390a92a9fcSCy Schubert 	if(iq->target_count && !*iq->nxns_dp &&
23400a92a9fcSCy Schubert 		iq->target_count[TARGET_COUNT_NX] > MAX_TARGET_NX) {
23410a92a9fcSCy Schubert 		struct delegpt_ns* ns;
23420a92a9fcSCy Schubert 		/* If we can wait for resolution, do so. */
23430a92a9fcSCy Schubert 		if(iq->num_target_queries>0 || iq->num_current_queries>0) {
23440a92a9fcSCy Schubert 			check_waiting_queries(iq, qstate, id);
23450a92a9fcSCy Schubert 			return 0;
23460a92a9fcSCy Schubert 		}
23470a92a9fcSCy Schubert 		verbose(VERB_ALGO, "request has exceeded the maximum "
23480a92a9fcSCy Schubert 			"number of nxdomain nameserver lookups (%d) with %d",
23490a92a9fcSCy Schubert 			MAX_TARGET_NX, iq->target_count[TARGET_COUNT_NX]);
23500a92a9fcSCy Schubert 		/* Check for dp because we require one below */
23510a92a9fcSCy Schubert 		if(!iq->dp) {
23520a92a9fcSCy Schubert 			verbose(VERB_QUERY, "Failed to get a delegation, "
23530a92a9fcSCy Schubert 				"giving up");
23540a92a9fcSCy Schubert 			errinf(qstate, "failed to get a delegation (eg. prime "
23550a92a9fcSCy Schubert 				"failure)");
23560a92a9fcSCy Schubert 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
23570a92a9fcSCy Schubert 		}
23580a92a9fcSCy Schubert 		/* We reached the limit but we already have parent side
23590a92a9fcSCy Schubert 		 * information; stop resolution */
23600a92a9fcSCy Schubert 		if(iq->dp->has_parent_side_NS) {
23610a92a9fcSCy Schubert 			verbose(VERB_ALGO, "parent-side information is "
23620a92a9fcSCy Schubert 				"already present for the delegation point, no "
23630a92a9fcSCy Schubert 				"fallback possible");
2364091e9e46SCy Schubert 			errinf(qstate, "exceeded the maximum nameserver nxdomains");
2365091e9e46SCy Schubert 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2366091e9e46SCy Schubert 		}
23670a92a9fcSCy Schubert 		verbose(VERB_ALGO, "initiating parent-side fallback for "
23680a92a9fcSCy Schubert 			"nxdomain nameserver lookups");
23690a92a9fcSCy Schubert 		/* Mark all the current NSes as resolved to allow for parent
23700a92a9fcSCy Schubert 		 * fallback */
23710a92a9fcSCy Schubert 		for(ns=iq->dp->nslist; ns; ns=ns->next) {
23720a92a9fcSCy Schubert 			ns->resolved = 1;
23730a92a9fcSCy Schubert 		}
23740a92a9fcSCy Schubert 		/* Note the delegation point that triggered the NXNS fallback;
23750a92a9fcSCy Schubert 		 * no reason for shared queries to keep trying there.
23760a92a9fcSCy Schubert 		 * This also marks the fallback activation. */
23770a92a9fcSCy Schubert 		*iq->nxns_dp = malloc(iq->dp->namelen);
23780a92a9fcSCy Schubert 		if(!*iq->nxns_dp) {
23790a92a9fcSCy Schubert 			verbose(VERB_ALGO, "out of memory while initiating "
23800a92a9fcSCy Schubert 				"fallback");
23810a92a9fcSCy Schubert 			errinf(qstate, "exceeded the maximum nameserver "
23820a92a9fcSCy Schubert 				"nxdomains (malloc)");
23830a92a9fcSCy Schubert 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
23840a92a9fcSCy Schubert 		}
23850a92a9fcSCy Schubert 		memcpy(*iq->nxns_dp, iq->dp->name, iq->dp->namelen);
23860a92a9fcSCy Schubert 	} else if(iq->target_count && *iq->nxns_dp) {
23870a92a9fcSCy Schubert 		/* Handle the NXNS fallback case. */
23880a92a9fcSCy Schubert 		/* If we can wait for resolution, do so. */
23890a92a9fcSCy Schubert 		if(iq->num_target_queries>0 || iq->num_current_queries>0) {
23900a92a9fcSCy Schubert 			check_waiting_queries(iq, qstate, id);
23910a92a9fcSCy Schubert 			return 0;
23920a92a9fcSCy Schubert 		}
23930a92a9fcSCy Schubert 		/* Check for dp because we require one below */
23940a92a9fcSCy Schubert 		if(!iq->dp) {
23950a92a9fcSCy Schubert 			verbose(VERB_QUERY, "Failed to get a delegation, "
23960a92a9fcSCy Schubert 				"giving up");
23970a92a9fcSCy Schubert 			errinf(qstate, "failed to get a delegation (eg. prime "
23980a92a9fcSCy Schubert 				"failure)");
23990a92a9fcSCy Schubert 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
24000a92a9fcSCy Schubert 		}
24010a92a9fcSCy Schubert 
24020a92a9fcSCy Schubert 		if(iq->target_count[TARGET_COUNT_NX] > MAX_TARGET_NX_FALLBACK) {
24030a92a9fcSCy Schubert 			verbose(VERB_ALGO, "request has exceeded the maximum "
24040a92a9fcSCy Schubert 				"number of fallback nxdomain nameserver "
24050a92a9fcSCy Schubert 				"lookups (%d) with %d", MAX_TARGET_NX_FALLBACK,
24060a92a9fcSCy Schubert 				iq->target_count[TARGET_COUNT_NX]);
24070a92a9fcSCy Schubert 			errinf(qstate, "exceeded the maximum nameserver nxdomains");
24080a92a9fcSCy Schubert 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
24090a92a9fcSCy Schubert 		}
24100a92a9fcSCy Schubert 
24110a92a9fcSCy Schubert 		if(!iq->dp->has_parent_side_NS) {
24120a92a9fcSCy Schubert 			struct delegpt_ns* ns;
24130a92a9fcSCy Schubert 			if(!dname_canonical_compare(*iq->nxns_dp, iq->dp->name)) {
24140a92a9fcSCy Schubert 				verbose(VERB_ALGO, "this delegation point "
24150a92a9fcSCy Schubert 					"initiated the fallback, marking the "
24160a92a9fcSCy Schubert 					"nslist as resolved");
24170a92a9fcSCy Schubert 				for(ns=iq->dp->nslist; ns; ns=ns->next) {
24180a92a9fcSCy Schubert 					ns->resolved = 1;
24190a92a9fcSCy Schubert 				}
24200a92a9fcSCy Schubert 			}
24210a92a9fcSCy Schubert 		}
24220a92a9fcSCy Schubert 	}
2423b7579f77SDag-Erling Smørgrav 
2424b7579f77SDag-Erling Smørgrav 	/* Make sure we have a delegation point, otherwise priming failed
2425b7579f77SDag-Erling Smørgrav 	 * or another failure occurred */
2426b7579f77SDag-Erling Smørgrav 	if(!iq->dp) {
2427b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "Failed to get a delegation, giving up");
24284c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "failed to get a delegation (eg. prime failure)");
2429b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2430b7579f77SDag-Erling Smørgrav 	}
2431b7579f77SDag-Erling Smørgrav 	if(!ie->supports_ipv6)
2432b7579f77SDag-Erling Smørgrav 		delegpt_no_ipv6(iq->dp);
2433*8f76bb7dSCy Schubert 	if(!ie->supports_ipv4 && !ie->use_nat64)
2434b7579f77SDag-Erling Smørgrav 		delegpt_no_ipv4(iq->dp);
2435b7579f77SDag-Erling Smørgrav 	delegpt_log(VERB_ALGO, iq->dp);
2436b7579f77SDag-Erling Smørgrav 
2437b7579f77SDag-Erling Smørgrav 	if(iq->num_current_queries>0) {
2438b7579f77SDag-Erling Smørgrav 		/* already busy answering a query, this restart is because
2439b7579f77SDag-Erling Smørgrav 		 * more delegpt addrs became available, wait for existing
2440b7579f77SDag-Erling Smørgrav 		 * query. */
2441b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "woke up, but wait for outstanding query");
2442b7579f77SDag-Erling Smørgrav 		qstate->ext_state[id] = module_wait_reply;
2443b7579f77SDag-Erling Smørgrav 		return 0;
2444b7579f77SDag-Erling Smørgrav 	}
2445b7579f77SDag-Erling Smørgrav 
2446a755b6f6SDag-Erling Smørgrav 	if(iq->minimisation_state == INIT_MINIMISE_STATE
2447a755b6f6SDag-Erling Smørgrav 		&& !(iq->chase_flags & BIT_RD)) {
244857bddd21SDag-Erling Smørgrav 		/* (Re)set qinfo_out to (new) delegation point, except when
244957bddd21SDag-Erling Smørgrav 		 * qinfo_out is already a subdomain of dp. This happens when
245057bddd21SDag-Erling Smørgrav 		 * increasing by more than one label at once (QNAMEs with more
245157bddd21SDag-Erling Smørgrav 		 * than MAX_MINIMISE_COUNT labels). */
245257bddd21SDag-Erling Smørgrav 		if(!(iq->qinfo_out.qname_len
245357bddd21SDag-Erling Smørgrav 			&& dname_subdomain_c(iq->qchase.qname,
245457bddd21SDag-Erling Smørgrav 				iq->qinfo_out.qname)
245557bddd21SDag-Erling Smørgrav 			&& dname_subdomain_c(iq->qinfo_out.qname,
245657bddd21SDag-Erling Smørgrav 				iq->dp->name))) {
245757bddd21SDag-Erling Smørgrav 			iq->qinfo_out.qname = iq->dp->name;
245857bddd21SDag-Erling Smørgrav 			iq->qinfo_out.qname_len = iq->dp->namelen;
245957bddd21SDag-Erling Smørgrav 			iq->qinfo_out.qtype = LDNS_RR_TYPE_A;
246057bddd21SDag-Erling Smørgrav 			iq->qinfo_out.qclass = iq->qchase.qclass;
246157bddd21SDag-Erling Smørgrav 			iq->qinfo_out.local_alias = NULL;
246257bddd21SDag-Erling Smørgrav 			iq->minimise_count = 0;
246357bddd21SDag-Erling Smørgrav 		}
246457bddd21SDag-Erling Smørgrav 
246557bddd21SDag-Erling Smørgrav 		iq->minimisation_state = MINIMISE_STATE;
246657bddd21SDag-Erling Smørgrav 	}
246757bddd21SDag-Erling Smørgrav 	if(iq->minimisation_state == MINIMISE_STATE) {
246857bddd21SDag-Erling Smørgrav 		int qchaselabs = dname_count_labels(iq->qchase.qname);
246957bddd21SDag-Erling Smørgrav 		int labdiff = qchaselabs -
247057bddd21SDag-Erling Smørgrav 			dname_count_labels(iq->qinfo_out.qname);
247157bddd21SDag-Erling Smørgrav 
2472e86b9096SDag-Erling Smørgrav 		qout_orig = iq->qinfo_out.qname;
2473e86b9096SDag-Erling Smørgrav 		qout_orig_len = iq->qinfo_out.qname_len;
247457bddd21SDag-Erling Smørgrav 		iq->qinfo_out.qname = iq->qchase.qname;
247557bddd21SDag-Erling Smørgrav 		iq->qinfo_out.qname_len = iq->qchase.qname_len;
247657bddd21SDag-Erling Smørgrav 		iq->minimise_count++;
247725039b37SCy Schubert 		iq->timeout_count = 0;
247857bddd21SDag-Erling Smørgrav 
247924e36522SCy Schubert 		iter_dec_attempts(iq->dp, 1, ie->outbound_msg_retry);
248057bddd21SDag-Erling Smørgrav 
248157bddd21SDag-Erling Smørgrav 		/* Limit number of iterations for QNAMEs with more
248257bddd21SDag-Erling Smørgrav 		 * than MAX_MINIMISE_COUNT labels. Send first MINIMISE_ONE_LAB
248357bddd21SDag-Erling Smørgrav 		 * labels of QNAME always individually.
248457bddd21SDag-Erling Smørgrav 		 */
248557bddd21SDag-Erling Smørgrav 		if(qchaselabs > MAX_MINIMISE_COUNT && labdiff > 1 &&
248657bddd21SDag-Erling Smørgrav 			iq->minimise_count > MINIMISE_ONE_LAB) {
248757bddd21SDag-Erling Smørgrav 			if(iq->minimise_count < MAX_MINIMISE_COUNT) {
248857bddd21SDag-Erling Smørgrav 				int multilabs = qchaselabs - 1 -
248957bddd21SDag-Erling Smørgrav 					MINIMISE_ONE_LAB;
249057bddd21SDag-Erling Smørgrav 				int extralabs = multilabs /
249157bddd21SDag-Erling Smørgrav 					MINIMISE_MULTIPLE_LABS;
249257bddd21SDag-Erling Smørgrav 
249357bddd21SDag-Erling Smørgrav 				if (MAX_MINIMISE_COUNT - iq->minimise_count >=
249457bddd21SDag-Erling Smørgrav 					multilabs % MINIMISE_MULTIPLE_LABS)
249557bddd21SDag-Erling Smørgrav 					/* Default behaviour is to add 1 label
249657bddd21SDag-Erling Smørgrav 					 * every iteration. Therefore, decrement
249757bddd21SDag-Erling Smørgrav 					 * the extralabs by 1 */
249857bddd21SDag-Erling Smørgrav 					extralabs--;
249957bddd21SDag-Erling Smørgrav 				if (extralabs < labdiff)
250057bddd21SDag-Erling Smørgrav 					labdiff -= extralabs;
250157bddd21SDag-Erling Smørgrav 				else
250257bddd21SDag-Erling Smørgrav 					labdiff = 1;
250357bddd21SDag-Erling Smørgrav 			}
250457bddd21SDag-Erling Smørgrav 			/* Last minimised iteration, send all labels with
250557bddd21SDag-Erling Smørgrav 			 * QTYPE=NS */
250657bddd21SDag-Erling Smørgrav 			else
250757bddd21SDag-Erling Smørgrav 				labdiff = 1;
250857bddd21SDag-Erling Smørgrav 		}
250957bddd21SDag-Erling Smørgrav 
251057bddd21SDag-Erling Smørgrav 		if(labdiff > 1) {
251157bddd21SDag-Erling Smørgrav 			verbose(VERB_QUERY, "removing %d labels", labdiff-1);
251257bddd21SDag-Erling Smørgrav 			dname_remove_labels(&iq->qinfo_out.qname,
251357bddd21SDag-Erling Smørgrav 				&iq->qinfo_out.qname_len,
251457bddd21SDag-Erling Smørgrav 				labdiff-1);
251557bddd21SDag-Erling Smørgrav 		}
251657bddd21SDag-Erling Smørgrav 		if(labdiff < 1 || (labdiff < 2
251757bddd21SDag-Erling Smørgrav 			&& (iq->qchase.qtype == LDNS_RR_TYPE_DS
251857bddd21SDag-Erling Smørgrav 			|| iq->qchase.qtype == LDNS_RR_TYPE_A)))
251957bddd21SDag-Erling Smørgrav 			/* Stop minimising this query, resolve "as usual" */
252057bddd21SDag-Erling Smørgrav 			iq->minimisation_state = DONOT_MINIMISE_STATE;
252157bddd21SDag-Erling Smørgrav 		else if(!qstate->no_cache_lookup) {
252257bddd21SDag-Erling Smørgrav 			struct dns_msg* msg = dns_cache_lookup(qstate->env,
252357bddd21SDag-Erling Smørgrav 				iq->qinfo_out.qname, iq->qinfo_out.qname_len,
252457bddd21SDag-Erling Smørgrav 				iq->qinfo_out.qtype, iq->qinfo_out.qclass,
252557bddd21SDag-Erling Smørgrav 				qstate->query_flags, qstate->region,
25265469a995SCy Schubert 				qstate->env->scratch, 0, iq->dp->name,
25275469a995SCy Schubert 				iq->dp->namelen);
2528091e9e46SCy Schubert 			if(msg && FLAGS_GET_RCODE(msg->rep->flags) ==
252957bddd21SDag-Erling Smørgrav 				LDNS_RCODE_NOERROR)
253057bddd21SDag-Erling Smørgrav 				/* no need to send query if it is already
2531091e9e46SCy Schubert 				 * cached as NOERROR */
253257bddd21SDag-Erling Smørgrav 				return 1;
2533091e9e46SCy Schubert 			if(msg && FLAGS_GET_RCODE(msg->rep->flags) ==
2534091e9e46SCy Schubert 				LDNS_RCODE_NXDOMAIN &&
2535091e9e46SCy Schubert 				qstate->env->need_to_validate &&
2536091e9e46SCy Schubert 				qstate->env->cfg->harden_below_nxdomain) {
2537091e9e46SCy Schubert 				if(msg->rep->security == sec_status_secure) {
2538091e9e46SCy Schubert 					iq->response = msg;
2539091e9e46SCy Schubert 					return final_state(iq);
2540091e9e46SCy Schubert 				}
2541091e9e46SCy Schubert 				if(msg->rep->security == sec_status_unchecked) {
2542091e9e46SCy Schubert 					struct module_qstate* subq = NULL;
2543091e9e46SCy Schubert 					if(!generate_sub_request(
2544091e9e46SCy Schubert 						iq->qinfo_out.qname,
2545091e9e46SCy Schubert 						iq->qinfo_out.qname_len,
2546091e9e46SCy Schubert 						iq->qinfo_out.qtype,
2547091e9e46SCy Schubert 						iq->qinfo_out.qclass,
2548091e9e46SCy Schubert 						qstate, id, iq,
2549091e9e46SCy Schubert 						INIT_REQUEST_STATE,
2550091e9e46SCy Schubert 						FINISHED_STATE, &subq, 1, 1))
2551091e9e46SCy Schubert 						verbose(VERB_ALGO,
2552091e9e46SCy Schubert 						"could not validate NXDOMAIN "
2553091e9e46SCy Schubert 						"response");
2554091e9e46SCy Schubert 				}
2555091e9e46SCy Schubert 			}
2556091e9e46SCy Schubert 			if(msg && FLAGS_GET_RCODE(msg->rep->flags) ==
2557091e9e46SCy Schubert 				LDNS_RCODE_NXDOMAIN) {
2558091e9e46SCy Schubert 				/* return and add a label in the next
2559091e9e46SCy Schubert 				 * minimisation iteration.
2560091e9e46SCy Schubert 				 */
2561091e9e46SCy Schubert 				return 1;
2562091e9e46SCy Schubert 			}
256357bddd21SDag-Erling Smørgrav 		}
256457bddd21SDag-Erling Smørgrav 	}
256557bddd21SDag-Erling Smørgrav 	if(iq->minimisation_state == SKIP_MINIMISE_STATE) {
256625039b37SCy Schubert 		if(iq->timeout_count < MAX_MINIMISE_TIMEOUT_COUNT)
256757bddd21SDag-Erling Smørgrav 			/* Do not increment qname, continue incrementing next
256857bddd21SDag-Erling Smørgrav 			 * iteration */
256957bddd21SDag-Erling Smørgrav 			iq->minimisation_state = MINIMISE_STATE;
257057bddd21SDag-Erling Smørgrav 		else if(!qstate->env->cfg->qname_minimisation_strict)
257157bddd21SDag-Erling Smørgrav 			/* Too many time-outs detected for this QNAME and QTYPE.
257257bddd21SDag-Erling Smørgrav 			 * We give up, disable QNAME minimisation. */
257357bddd21SDag-Erling Smørgrav 			iq->minimisation_state = DONOT_MINIMISE_STATE;
257457bddd21SDag-Erling Smørgrav 	}
257557bddd21SDag-Erling Smørgrav 	if(iq->minimisation_state == DONOT_MINIMISE_STATE)
257657bddd21SDag-Erling Smørgrav 		iq->qinfo_out = iq->qchase;
257757bddd21SDag-Erling Smørgrav 
257857bddd21SDag-Erling Smørgrav 	/* now find an answer to this query */
257957bddd21SDag-Erling Smørgrav 	/* see if authority zones have an answer */
258057bddd21SDag-Erling Smørgrav 	/* now we know the dp, we can check the auth zone for locally hosted
258157bddd21SDag-Erling Smørgrav 	 * contents */
258257bddd21SDag-Erling Smørgrav 	if(!iq->auth_zone_avoid && qstate->blacklist) {
258357bddd21SDag-Erling Smørgrav 		if(auth_zones_can_fallback(qstate->env->auth_zones,
258457bddd21SDag-Erling Smørgrav 			iq->dp->name, iq->dp->namelen, iq->qinfo_out.qclass)) {
258557bddd21SDag-Erling Smørgrav 			/* if cache is blacklisted and this zone allows us
258657bddd21SDag-Erling Smørgrav 			 * to fallback to the internet, then do so, and
258757bddd21SDag-Erling Smørgrav 			 * fetch results from the internet servers */
258857bddd21SDag-Erling Smørgrav 			iq->auth_zone_avoid = 1;
258957bddd21SDag-Erling Smørgrav 		}
259057bddd21SDag-Erling Smørgrav 	}
259157bddd21SDag-Erling Smørgrav 	if(iq->auth_zone_avoid) {
259257bddd21SDag-Erling Smørgrav 		iq->auth_zone_avoid = 0;
259357bddd21SDag-Erling Smørgrav 		auth_fallback = 1;
259457bddd21SDag-Erling Smørgrav 	} else if(auth_zones_lookup(qstate->env->auth_zones, &iq->qinfo_out,
259557bddd21SDag-Erling Smørgrav 		qstate->region, &iq->response, &auth_fallback, iq->dp->name,
259657bddd21SDag-Erling Smørgrav 		iq->dp->namelen)) {
259757bddd21SDag-Erling Smørgrav 		/* use this as a response to be processed by the iterator */
259857bddd21SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO) {
259957bddd21SDag-Erling Smørgrav 			log_dns_msg("msg from auth zone",
260057bddd21SDag-Erling Smørgrav 				&iq->response->qinfo, iq->response->rep);
260157bddd21SDag-Erling Smørgrav 		}
26020fb34990SDag-Erling Smørgrav 		if((iq->chase_flags&BIT_RD) && !(iq->response->rep->flags&BIT_AA)) {
26030fb34990SDag-Erling Smørgrav 			verbose(VERB_ALGO, "forwarder, ignoring referral from auth zone");
26040fb34990SDag-Erling Smørgrav 		} else {
26050fb34990SDag-Erling Smørgrav 			lock_rw_wrlock(&qstate->env->auth_zones->lock);
26060fb34990SDag-Erling Smørgrav 			qstate->env->auth_zones->num_query_up++;
26070fb34990SDag-Erling Smørgrav 			lock_rw_unlock(&qstate->env->auth_zones->lock);
260857bddd21SDag-Erling Smørgrav 			iq->num_current_queries++;
260957bddd21SDag-Erling Smørgrav 			iq->chase_to_rd = 0;
261057bddd21SDag-Erling Smørgrav 			iq->dnssec_lame_query = 0;
261157bddd21SDag-Erling Smørgrav 			iq->auth_zone_response = 1;
261257bddd21SDag-Erling Smørgrav 			return next_state(iq, QUERY_RESP_STATE);
261357bddd21SDag-Erling Smørgrav 		}
26140fb34990SDag-Erling Smørgrav 	}
261557bddd21SDag-Erling Smørgrav 	iq->auth_zone_response = 0;
261657bddd21SDag-Erling Smørgrav 	if(auth_fallback == 0) {
261757bddd21SDag-Erling Smørgrav 		/* like we got servfail from the auth zone lookup, and
261857bddd21SDag-Erling Smørgrav 		 * no internet fallback */
261957bddd21SDag-Erling Smørgrav 		verbose(VERB_ALGO, "auth zone lookup failed, no fallback,"
262057bddd21SDag-Erling Smørgrav 			" servfail");
26214c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "auth zone lookup failed, fallback is off");
262257bddd21SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
262357bddd21SDag-Erling Smørgrav 	}
2624e86b9096SDag-Erling Smørgrav 	if(iq->dp->auth_dp) {
262557bddd21SDag-Erling Smørgrav 		/* we wanted to fallback, but had no delegpt, only the
262657bddd21SDag-Erling Smørgrav 		 * auth zone generated delegpt, create an actual one */
262757bddd21SDag-Erling Smørgrav 		iq->auth_zone_avoid = 1;
262857bddd21SDag-Erling Smørgrav 		return next_state(iq, INIT_REQUEST_STATE);
262957bddd21SDag-Erling Smørgrav 	}
263057bddd21SDag-Erling Smørgrav 	/* but mostly, fallback==1 (like, when no such auth zone exists)
263157bddd21SDag-Erling Smørgrav 	 * and we continue with lookups */
263257bddd21SDag-Erling Smørgrav 
2633b7579f77SDag-Erling Smørgrav 	tf_policy = 0;
2634b7579f77SDag-Erling Smørgrav 	/* < not <=, because although the array is large enough for <=, the
2635b7579f77SDag-Erling Smørgrav 	 * generated query will immediately be discarded due to depth and
2636b7579f77SDag-Erling Smørgrav 	 * that servfail is cached, which is not good as opportunism goes. */
2637b7579f77SDag-Erling Smørgrav 	if(iq->depth < ie->max_dependency_depth
2638091e9e46SCy Schubert 		&& iq->num_target_queries == 0
26390a92a9fcSCy Schubert 		&& (!iq->target_count || iq->target_count[TARGET_COUNT_NX]==0)
2640865f46b2SCy Schubert 		&& iq->sent_count < TARGET_FETCH_STOP) {
2641865f46b2SCy Schubert 		can_do_promisc = 1;
2642865f46b2SCy Schubert 	}
2643865f46b2SCy Schubert 	/* if the mesh query list is full, then do not waste cpu and sockets to
2644865f46b2SCy Schubert 	 * fetch promiscuous targets. They can be looked up when needed. */
2645865f46b2SCy Schubert 	if(can_do_promisc && !mesh_jostle_exceeded(qstate->env->mesh)) {
2646b7579f77SDag-Erling Smørgrav 		tf_policy = ie->target_fetch_policy[iq->depth];
2647b7579f77SDag-Erling Smørgrav 	}
2648b7579f77SDag-Erling Smørgrav 
2649b7579f77SDag-Erling Smørgrav 	/* if in 0x20 fallback get as many targets as possible */
2650b7579f77SDag-Erling Smørgrav 	if(iq->caps_fallback) {
2651b7579f77SDag-Erling Smørgrav 		int extra = 0;
2652b7579f77SDag-Erling Smørgrav 		size_t naddr, nres, navail;
2653b7579f77SDag-Erling Smørgrav 		if(!query_for_targets(qstate, iq, ie, id, -1, &extra)) {
26544c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "could not fetch nameservers for 0x20 fallback");
2655b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2656b7579f77SDag-Erling Smørgrav 		}
2657b7579f77SDag-Erling Smørgrav 		iq->num_target_queries += extra;
265852df462fSXin LI 		target_count_increase(iq, extra);
2659b7579f77SDag-Erling Smørgrav 		if(iq->num_target_queries > 0) {
2660b7579f77SDag-Erling Smørgrav 			/* wait to get all targets, we want to try em */
2661b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "wait for all targets for fallback");
2662b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_reply;
2663e86b9096SDag-Erling Smørgrav 			/* undo qname minimise step because we'll get back here
2664e86b9096SDag-Erling Smørgrav 			 * to do it again */
2665e86b9096SDag-Erling Smørgrav 			if(qout_orig && iq->minimise_count > 0) {
2666e86b9096SDag-Erling Smørgrav 				iq->minimise_count--;
2667e86b9096SDag-Erling Smørgrav 				iq->qinfo_out.qname = qout_orig;
2668e86b9096SDag-Erling Smørgrav 				iq->qinfo_out.qname_len = qout_orig_len;
2669e86b9096SDag-Erling Smørgrav 			}
2670b7579f77SDag-Erling Smørgrav 			return 0;
2671b7579f77SDag-Erling Smørgrav 		}
2672b7579f77SDag-Erling Smørgrav 		/* did we do enough fallback queries already? */
2673b7579f77SDag-Erling Smørgrav 		delegpt_count_addr(iq->dp, &naddr, &nres, &navail);
2674b7579f77SDag-Erling Smørgrav 		/* the current caps_server is the number of fallbacks sent.
2675b7579f77SDag-Erling Smørgrav 		 * the original query is one that matched too, so we have
2676b7579f77SDag-Erling Smørgrav 		 * caps_server+1 number of matching queries now */
2677b7579f77SDag-Erling Smørgrav 		if(iq->caps_server+1 >= naddr*3 ||
26781838dec3SCy Schubert 			iq->caps_server*2+2 >= (size_t)ie->max_sent_count) {
267909a3aaf3SDag-Erling Smørgrav 			/* *2 on sentcount check because ipv6 may fail */
2680b7579f77SDag-Erling Smørgrav 			/* we're done, process the response */
2681b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "0x20 fallback had %d responses "
2682b7579f77SDag-Erling Smørgrav 				"match for %d wanted, done.",
2683b7579f77SDag-Erling Smørgrav 				(int)iq->caps_server+1, (int)naddr*3);
268409a3aaf3SDag-Erling Smørgrav 			iq->response = iq->caps_response;
2685b7579f77SDag-Erling Smørgrav 			iq->caps_fallback = 0;
268624e36522SCy Schubert 			iter_dec_attempts(iq->dp, 3, ie->outbound_msg_retry); /* space for fallback */
2687b7579f77SDag-Erling Smørgrav 			iq->num_current_queries++; /* RespState decrements it*/
2688b7579f77SDag-Erling Smørgrav 			iq->referral_count++; /* make sure we don't loop */
2689b7579f77SDag-Erling Smørgrav 			iq->sent_count = 0;
2690091e9e46SCy Schubert 			iq->dp_target_count = 0;
2691b7579f77SDag-Erling Smørgrav 			iq->state = QUERY_RESP_STATE;
2692b7579f77SDag-Erling Smørgrav 			return 1;
2693b7579f77SDag-Erling Smørgrav 		}
2694b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "0x20 fallback number %d",
2695b7579f77SDag-Erling Smørgrav 			(int)iq->caps_server);
2696b7579f77SDag-Erling Smørgrav 
2697b7579f77SDag-Erling Smørgrav 	/* if there is a policy to fetch missing targets
2698b7579f77SDag-Erling Smørgrav 	 * opportunistically, do it. we rely on the fact that once a
2699b7579f77SDag-Erling Smørgrav 	 * query (or queries) for a missing name have been issued,
2700b7579f77SDag-Erling Smørgrav 	 * they will not show up again. */
2701b7579f77SDag-Erling Smørgrav 	} else if(tf_policy != 0) {
2702b7579f77SDag-Erling Smørgrav 		int extra = 0;
2703b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "attempt to get extra %d targets",
2704b7579f77SDag-Erling Smørgrav 			tf_policy);
2705b7579f77SDag-Erling Smørgrav 		(void)query_for_targets(qstate, iq, ie, id, tf_policy, &extra);
2706b7579f77SDag-Erling Smørgrav 		/* errors ignored, these targets are not strictly necessary for
2707b7579f77SDag-Erling Smørgrav 		 * this result, we do not have to reply with SERVFAIL */
2708b7579f77SDag-Erling Smørgrav 		iq->num_target_queries += extra;
270952df462fSXin LI 		target_count_increase(iq, extra);
2710b7579f77SDag-Erling Smørgrav 	}
2711b7579f77SDag-Erling Smørgrav 
2712b7579f77SDag-Erling Smørgrav 	/* Add the current set of unused targets to our queue. */
2713b7579f77SDag-Erling Smørgrav 	delegpt_add_unused_targets(iq->dp);
2714b7579f77SDag-Erling Smørgrav 
271524e36522SCy Schubert 	if(qstate->env->auth_zones) {
271624e36522SCy Schubert 		/* apply rpz triggers at query time */
271724e36522SCy Schubert 		struct dns_msg* forged_response = rpz_callback_from_iterator_module(qstate, iq);
271824e36522SCy Schubert 		if(forged_response != NULL) {
271924e36522SCy Schubert 			qstate->ext_state[id] = module_finished;
27209cf5bc93SCy Schubert 			qstate->return_rcode = LDNS_RCODE_NOERROR;
272124e36522SCy Schubert 			qstate->return_msg = forged_response;
272224e36522SCy Schubert 			iq->response = forged_response;
272324e36522SCy Schubert 			next_state(iq, FINISHED_STATE);
272424e36522SCy Schubert 			if(!iter_prepend(iq, qstate->return_msg, qstate->region)) {
2725a39a5a69SCy Schubert 				log_err("rpz: prepend rrsets: out of memory");
272624e36522SCy Schubert 				return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
272724e36522SCy Schubert 			}
272824e36522SCy Schubert 			return 0;
272924e36522SCy Schubert 		}
273024e36522SCy Schubert 	}
273124e36522SCy Schubert 
2732b7579f77SDag-Erling Smørgrav 	/* Select the next usable target, filtering out unsuitable targets. */
2733b7579f77SDag-Erling Smørgrav 	target = iter_server_selection(ie, qstate->env, iq->dp,
2734b7579f77SDag-Erling Smørgrav 		iq->dp->name, iq->dp->namelen, iq->qchase.qtype,
2735b7579f77SDag-Erling Smørgrav 		&iq->dnssec_lame_query, &iq->chase_to_rd,
27360fb34990SDag-Erling Smørgrav 		iq->num_target_queries, qstate->blacklist,
27370fb34990SDag-Erling Smørgrav 		qstate->prefetch_leeway);
2738b7579f77SDag-Erling Smørgrav 
2739b7579f77SDag-Erling Smørgrav 	/* If no usable target was selected... */
2740b7579f77SDag-Erling Smørgrav 	if(!target) {
2741b7579f77SDag-Erling Smørgrav 		/* Here we distinguish between three states: generate a new
2742b7579f77SDag-Erling Smørgrav 		 * target query, just wait, or quit (with a SERVFAIL).
2743b7579f77SDag-Erling Smørgrav 		 * We have the following information: number of active
2744b7579f77SDag-Erling Smørgrav 		 * target queries, number of active current queries,
2745b7579f77SDag-Erling Smørgrav 		 * the presence of missing targets at this delegation
2746b7579f77SDag-Erling Smørgrav 		 * point, and the given query target policy. */
2747b7579f77SDag-Erling Smørgrav 
2748b7579f77SDag-Erling Smørgrav 		/* Check for the wait condition. If this is true, then
2749b7579f77SDag-Erling Smørgrav 		 * an action must be taken. */
2750b7579f77SDag-Erling Smørgrav 		if(iq->num_target_queries==0 && iq->num_current_queries==0) {
2751b7579f77SDag-Erling Smørgrav 			/* If there is nothing to wait for, then we need
2752b7579f77SDag-Erling Smørgrav 			 * to distinguish between generating (a) new target
2753b7579f77SDag-Erling Smørgrav 			 * query, or failing. */
27540a92a9fcSCy Schubert 			if(delegpt_count_missing_targets(iq->dp, NULL) > 0) {
2755b7579f77SDag-Erling Smørgrav 				int qs = 0;
2756b7579f77SDag-Erling Smørgrav 				verbose(VERB_ALGO, "querying for next "
2757b7579f77SDag-Erling Smørgrav 					"missing target");
2758b7579f77SDag-Erling Smørgrav 				if(!query_for_targets(qstate, iq, ie, id,
2759b7579f77SDag-Erling Smørgrav 					1, &qs)) {
27604c75e3aaSDag-Erling Smørgrav 					errinf(qstate, "could not fetch nameserver");
27614c75e3aaSDag-Erling Smørgrav 					errinf_dname(qstate, "at zone", iq->dp->name);
2762b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
2763b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
2764b7579f77SDag-Erling Smørgrav 				}
2765b7579f77SDag-Erling Smørgrav 				if(qs == 0 &&
27660a92a9fcSCy Schubert 				   delegpt_count_missing_targets(iq->dp, NULL) == 0){
2767b7579f77SDag-Erling Smørgrav 					/* it looked like there were missing
2768b7579f77SDag-Erling Smørgrav 					 * targets, but they did not turn up.
2769b7579f77SDag-Erling Smørgrav 					 * Try the bad choices again (if any),
2770b7579f77SDag-Erling Smørgrav 					 * when we get back here missing==0,
2771b7579f77SDag-Erling Smørgrav 					 * so this is not a loop. */
2772b7579f77SDag-Erling Smørgrav 					return 1;
2773b7579f77SDag-Erling Smørgrav 				}
2774b7579f77SDag-Erling Smørgrav 				iq->num_target_queries += qs;
277552df462fSXin LI 				target_count_increase(iq, qs);
2776b7579f77SDag-Erling Smørgrav 			}
2777b7579f77SDag-Erling Smørgrav 			/* Since a target query might have been made, we
2778b7579f77SDag-Erling Smørgrav 			 * need to check again. */
2779b7579f77SDag-Erling Smørgrav 			if(iq->num_target_queries == 0) {
278009a3aaf3SDag-Erling Smørgrav 				/* if in capsforid fallback, instead of last
278109a3aaf3SDag-Erling Smørgrav 				 * resort, we agree with the current reply
278209a3aaf3SDag-Erling Smørgrav 				 * we have (if any) (our count of addrs bad)*/
278309a3aaf3SDag-Erling Smørgrav 				if(iq->caps_fallback && iq->caps_reply) {
278409a3aaf3SDag-Erling Smørgrav 					/* we're done, process the response */
278509a3aaf3SDag-Erling Smørgrav 					verbose(VERB_ALGO, "0x20 fallback had %d responses, "
278609a3aaf3SDag-Erling Smørgrav 						"but no more servers except "
278709a3aaf3SDag-Erling Smørgrav 						"last resort, done.",
278809a3aaf3SDag-Erling Smørgrav 						(int)iq->caps_server+1);
278909a3aaf3SDag-Erling Smørgrav 					iq->response = iq->caps_response;
279009a3aaf3SDag-Erling Smørgrav 					iq->caps_fallback = 0;
279124e36522SCy Schubert 					iter_dec_attempts(iq->dp, 3, ie->outbound_msg_retry); /* space for fallback */
279209a3aaf3SDag-Erling Smørgrav 					iq->num_current_queries++; /* RespState decrements it*/
279309a3aaf3SDag-Erling Smørgrav 					iq->referral_count++; /* make sure we don't loop */
279409a3aaf3SDag-Erling Smørgrav 					iq->sent_count = 0;
2795091e9e46SCy Schubert 					iq->dp_target_count = 0;
279609a3aaf3SDag-Erling Smørgrav 					iq->state = QUERY_RESP_STATE;
279709a3aaf3SDag-Erling Smørgrav 					return 1;
279809a3aaf3SDag-Erling Smørgrav 				}
2799b7579f77SDag-Erling Smørgrav 				return processLastResort(qstate, iq, ie, id);
2800b7579f77SDag-Erling Smørgrav 			}
2801b7579f77SDag-Erling Smørgrav 		}
2802b7579f77SDag-Erling Smørgrav 
2803b7579f77SDag-Erling Smørgrav 		/* otherwise, we have no current targets, so submerge
2804b7579f77SDag-Erling Smørgrav 		 * until one of the target or direct queries return. */
28050a92a9fcSCy Schubert 		verbose(VERB_ALGO, "no current targets");
28060a92a9fcSCy Schubert 		check_waiting_queries(iq, qstate, id);
2807e86b9096SDag-Erling Smørgrav 		/* undo qname minimise step because we'll get back here
2808e86b9096SDag-Erling Smørgrav 		 * to do it again */
2809e86b9096SDag-Erling Smørgrav 		if(qout_orig && iq->minimise_count > 0) {
2810e86b9096SDag-Erling Smørgrav 			iq->minimise_count--;
2811e86b9096SDag-Erling Smørgrav 			iq->qinfo_out.qname = qout_orig;
2812e86b9096SDag-Erling Smørgrav 			iq->qinfo_out.qname_len = qout_orig_len;
2813e86b9096SDag-Erling Smørgrav 		}
2814b7579f77SDag-Erling Smørgrav 		return 0;
2815b7579f77SDag-Erling Smørgrav 	}
2816b7579f77SDag-Erling Smørgrav 
2817865f46b2SCy Schubert 	/* We have a target. We could have created promiscuous target
2818865f46b2SCy Schubert 	 * queries but we are currently under pressure (mesh_jostle_exceeded).
2819865f46b2SCy Schubert 	 * If we are configured to allow promiscuous target queries and haven't
2820865f46b2SCy Schubert 	 * gone out to the network for a target query for this delegation, then
2821865f46b2SCy Schubert 	 * it is possible to slip in a promiscuous one with a 1/10 chance. */
2822865f46b2SCy Schubert 	if(can_do_promisc && tf_policy == 0 && iq->depth == 0
2823865f46b2SCy Schubert 		&& iq->depth < ie->max_dependency_depth
2824865f46b2SCy Schubert 		&& ie->target_fetch_policy[iq->depth] != 0
2825865f46b2SCy Schubert 		&& iq->dp_target_count == 0
2826865f46b2SCy Schubert 		&& !ub_random_max(qstate->env->rnd, 10)) {
2827865f46b2SCy Schubert 		int extra = 0;
2828865f46b2SCy Schubert 		verbose(VERB_ALGO, "available target exists in cache but "
2829865f46b2SCy Schubert 			"attempt to get extra 1 target");
2830865f46b2SCy Schubert 		(void)query_for_targets(qstate, iq, ie, id, 1, &extra);
2831865f46b2SCy Schubert 		/* errors ignored, these targets are not strictly necessary for
2832865f46b2SCy Schubert 		* this result, we do not have to reply with SERVFAIL */
2833865f46b2SCy Schubert 		if(extra > 0) {
2834865f46b2SCy Schubert 			iq->num_target_queries += extra;
2835865f46b2SCy Schubert 			target_count_increase(iq, extra);
2836865f46b2SCy Schubert 			check_waiting_queries(iq, qstate, id);
2837865f46b2SCy Schubert 			/* undo qname minimise step because we'll get back here
2838865f46b2SCy Schubert 			 * to do it again */
2839865f46b2SCy Schubert 			if(qout_orig && iq->minimise_count > 0) {
2840865f46b2SCy Schubert 				iq->minimise_count--;
2841865f46b2SCy Schubert 				iq->qinfo_out.qname = qout_orig;
2842865f46b2SCy Schubert 				iq->qinfo_out.qname_len = qout_orig_len;
2843865f46b2SCy Schubert 			}
2844865f46b2SCy Schubert 			return 0;
2845865f46b2SCy Schubert 		}
2846865f46b2SCy Schubert 	}
2847865f46b2SCy Schubert 
28489cf5bc93SCy Schubert 	/* Do not check ratelimit for forwarding queries or if we already got a
28499cf5bc93SCy Schubert 	 * pass. */
28509cf5bc93SCy Schubert 	sq_check_ratelimit = (!(iq->chase_flags & BIT_RD) && !iq->ratelimit_ok);
2851b7579f77SDag-Erling Smørgrav 	/* We have a valid target. */
2852b7579f77SDag-Erling Smørgrav 	if(verbosity >= VERB_QUERY) {
285305ab2901SDag-Erling Smørgrav 		log_query_info(VERB_QUERY, "sending query:", &iq->qinfo_out);
2854b7579f77SDag-Erling Smørgrav 		log_name_addr(VERB_QUERY, "sending to target:", iq->dp->name,
2855b7579f77SDag-Erling Smørgrav 			&target->addr, target->addrlen);
2856b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "dnssec status: %s%s",
2857b7579f77SDag-Erling Smørgrav 			iq->dnssec_expected?"expected": "not expected",
2858b7579f77SDag-Erling Smørgrav 			iq->dnssec_lame_query?" but lame_query anyway": "");
2859b7579f77SDag-Erling Smørgrav 	}
2860*8f76bb7dSCy Schubert 
2861*8f76bb7dSCy Schubert 	real_addr = target->addr;
2862*8f76bb7dSCy Schubert 	real_addrlen = target->addrlen;
2863*8f76bb7dSCy Schubert 
2864*8f76bb7dSCy Schubert 	if(ie->use_nat64 && target->addr.ss_family == AF_INET) {
2865*8f76bb7dSCy Schubert 		addr_to_nat64(&target->addr, &ie->nat64_prefix_addr,
2866*8f76bb7dSCy Schubert 			ie->nat64_prefix_addrlen, ie->nat64_prefix_net,
2867*8f76bb7dSCy Schubert 			&real_addr, &real_addrlen);
2868*8f76bb7dSCy Schubert 		log_name_addr(VERB_QUERY, "applied NAT64:",
2869*8f76bb7dSCy Schubert 			iq->dp->name, &real_addr, real_addrlen);
2870*8f76bb7dSCy Schubert 	}
2871*8f76bb7dSCy Schubert 
2872b7579f77SDag-Erling Smørgrav 	fptr_ok(fptr_whitelist_modenv_send_query(qstate->env->send_query));
2873bc892140SDag-Erling Smørgrav 	outq = (*qstate->env->send_query)(&iq->qinfo_out,
2874e2d15004SDag-Erling Smørgrav 		iq->chase_flags | (iq->chase_to_rd?BIT_RD:0),
2875e2d15004SDag-Erling Smørgrav 		/* unset CD if to forwarder(RD set) and not dnssec retry
2876e2d15004SDag-Erling Smørgrav 		 * (blacklist nonempty) and no trust-anchors are configured
2877e2d15004SDag-Erling Smørgrav 		 * above the qname or on the first attempt when dnssec is on */
2878e2d15004SDag-Erling Smørgrav 		EDNS_DO| ((iq->chase_to_rd||(iq->chase_flags&BIT_RD)!=0)&&
28790fb34990SDag-Erling Smørgrav 		!qstate->blacklist&&(!iter_qname_indicates_dnssec(qstate->env,
2880e2d15004SDag-Erling Smørgrav 		&iq->qinfo_out)||target->attempts==1)?0:BIT_CD),
288109a3aaf3SDag-Erling Smørgrav 		iq->dnssec_expected, iq->caps_fallback || is_caps_whitelisted(
2882*8f76bb7dSCy Schubert 		ie, iq), sq_check_ratelimit, &real_addr, real_addrlen,
2883bc892140SDag-Erling Smørgrav 		iq->dp->name, iq->dp->namelen,
288424e36522SCy Schubert 		(iq->dp->tcp_upstream || qstate->env->cfg->tcp_upstream),
28850fb34990SDag-Erling Smørgrav 		(iq->dp->ssl_upstream || qstate->env->cfg->ssl_upstream),
28869cf5bc93SCy Schubert 		target->tls_auth_name, qstate, &sq_was_ratelimited);
2887b7579f77SDag-Erling Smørgrav 	if(!outq) {
28889cf5bc93SCy Schubert 		if(sq_was_ratelimited) {
28899cf5bc93SCy Schubert 			lock_basic_lock(&ie->queries_ratelimit_lock);
28909cf5bc93SCy Schubert 			ie->num_queries_ratelimited++;
28919cf5bc93SCy Schubert 			lock_basic_unlock(&ie->queries_ratelimit_lock);
28929cf5bc93SCy Schubert 			verbose(VERB_ALGO, "query exceeded ratelimits");
28939cf5bc93SCy Schubert 			qstate->was_ratelimited = 1;
28949cf5bc93SCy Schubert 			errinf_dname(qstate, "exceeded ratelimit for zone",
28959cf5bc93SCy Schubert 				iq->dp->name);
28969cf5bc93SCy Schubert 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
28979cf5bc93SCy Schubert 		}
28985469a995SCy Schubert 		log_addr(VERB_QUERY, "error sending query to auth server",
2899*8f76bb7dSCy Schubert 			&real_addr, real_addrlen);
2900971980c3SDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation)
2901971980c3SDag-Erling Smørgrav 			iq->minimisation_state = SKIP_MINIMISE_STATE;
2902b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2903b7579f77SDag-Erling Smørgrav 	}
2904b7579f77SDag-Erling Smørgrav 	outbound_list_insert(&iq->outlist, outq);
2905b7579f77SDag-Erling Smørgrav 	iq->num_current_queries++;
2906b7579f77SDag-Erling Smørgrav 	iq->sent_count++;
2907b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_wait_reply;
2908b7579f77SDag-Erling Smørgrav 
2909b7579f77SDag-Erling Smørgrav 	return 0;
2910b7579f77SDag-Erling Smørgrav }
2911b7579f77SDag-Erling Smørgrav 
2912b7579f77SDag-Erling Smørgrav /** find NS rrset in given list */
2913b7579f77SDag-Erling Smørgrav static struct ub_packed_rrset_key*
2914b7579f77SDag-Erling Smørgrav find_NS(struct reply_info* rep, size_t from, size_t to)
2915b7579f77SDag-Erling Smørgrav {
2916b7579f77SDag-Erling Smørgrav 	size_t i;
2917b7579f77SDag-Erling Smørgrav 	for(i=from; i<to; i++) {
2918b7579f77SDag-Erling Smørgrav 		if(ntohs(rep->rrsets[i]->rk.type) == LDNS_RR_TYPE_NS)
2919b7579f77SDag-Erling Smørgrav 			return rep->rrsets[i];
2920b7579f77SDag-Erling Smørgrav 	}
2921b7579f77SDag-Erling Smørgrav 	return NULL;
2922b7579f77SDag-Erling Smørgrav }
2923b7579f77SDag-Erling Smørgrav 
2924b7579f77SDag-Erling Smørgrav 
2925b7579f77SDag-Erling Smørgrav /**
2926b7579f77SDag-Erling Smørgrav  * Process the query response. All queries end up at this state first. This
2927b7579f77SDag-Erling Smørgrav  * process generally consists of analyzing the response and routing the
2928b7579f77SDag-Erling Smørgrav  * event to the next state (either bouncing it back to a request state, or
2929b7579f77SDag-Erling Smørgrav  * terminating the processing for this event).
2930b7579f77SDag-Erling Smørgrav  *
2931b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2932b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
293324e36522SCy Schubert  * @param ie: iterator shared global environment.
2934b7579f77SDag-Erling Smørgrav  * @param id: module id.
2935b7579f77SDag-Erling Smørgrav  * @return true if the event requires more immediate processing, false if
2936b7579f77SDag-Erling Smørgrav  *         not. This is generally only true when forwarding the request to
2937b7579f77SDag-Erling Smørgrav  *         the final state (i.e., on answer).
2938b7579f77SDag-Erling Smørgrav  */
2939b7579f77SDag-Erling Smørgrav static int
2940b7579f77SDag-Erling Smørgrav processQueryResponse(struct module_qstate* qstate, struct iter_qstate* iq,
294124e36522SCy Schubert 	struct iter_env* ie, int id)
2942b7579f77SDag-Erling Smørgrav {
2943*8f76bb7dSCy Schubert 	int dnsseclame = 0, origtypecname = 0;
2944b7579f77SDag-Erling Smørgrav 	enum response_type type;
294524e36522SCy Schubert 
2946b7579f77SDag-Erling Smørgrav 	iq->num_current_queries--;
294765b390aaSDag-Erling Smørgrav 
294865b390aaSDag-Erling Smørgrav 	if(!inplace_cb_query_response_call(qstate->env, qstate, iq->response))
294965b390aaSDag-Erling Smørgrav 		log_err("unable to call query_response callback");
295065b390aaSDag-Erling Smørgrav 
2951b7579f77SDag-Erling Smørgrav 	if(iq->response == NULL) {
295205ab2901SDag-Erling Smørgrav 		/* Don't increment qname when QNAME minimisation is enabled */
2953971980c3SDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation) {
295405ab2901SDag-Erling Smørgrav 			iq->minimisation_state = SKIP_MINIMISE_STATE;
2955971980c3SDag-Erling Smørgrav 		}
295625039b37SCy Schubert 		iq->timeout_count++;
2957b7579f77SDag-Erling Smørgrav 		iq->chase_to_rd = 0;
2958b7579f77SDag-Erling Smørgrav 		iq->dnssec_lame_query = 0;
2959b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "query response was timeout");
2960b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2961b7579f77SDag-Erling Smørgrav 	}
296225039b37SCy Schubert 	iq->timeout_count = 0;
2963b7579f77SDag-Erling Smørgrav 	type = response_type_from_server(
2964b7579f77SDag-Erling Smørgrav 		(int)((iq->chase_flags&BIT_RD) || iq->chase_to_rd),
29650fb34990SDag-Erling Smørgrav 		iq->response, &iq->qinfo_out, iq->dp);
2966b7579f77SDag-Erling Smørgrav 	iq->chase_to_rd = 0;
2967865f46b2SCy Schubert 	/* remove TC flag, if this is erroneously set by TCP upstream */
2968865f46b2SCy Schubert 	iq->response->rep->flags &= ~BIT_TC;
29690fb34990SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_REFERRAL && (iq->chase_flags&BIT_RD) &&
29700fb34990SDag-Erling Smørgrav 		!iq->auth_zone_response) {
2971b7579f77SDag-Erling Smørgrav 		/* When forwarding (RD bit is set), we handle referrals
2972b7579f77SDag-Erling Smørgrav 		 * differently. No queries should be sent elsewhere */
2973b7579f77SDag-Erling Smørgrav 		type = RESPONSE_TYPE_ANSWER;
2974b7579f77SDag-Erling Smørgrav 	}
2975e2d15004SDag-Erling Smørgrav 	if(!qstate->env->cfg->disable_dnssec_lame_check && iq->dnssec_expected
2976e2d15004SDag-Erling Smørgrav                 && !iq->dnssec_lame_query &&
2977b7579f77SDag-Erling Smørgrav 		!(iq->chase_flags&BIT_RD)
2978e2d15004SDag-Erling Smørgrav 		&& iq->sent_count < DNSSEC_LAME_DETECT_COUNT
2979b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_LAME
2980b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_REC_LAME
2981b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_THROWAWAY
2982b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_UNTYPED) {
2983b7579f77SDag-Erling Smørgrav 		/* a possible answer, see if it is missing DNSSEC */
2984b7579f77SDag-Erling Smørgrav 		/* but not when forwarding, so we dont mark fwder lame */
298517d15b25SDag-Erling Smørgrav 		if(!iter_msg_has_dnssec(iq->response)) {
298617d15b25SDag-Erling Smørgrav 			/* Mark this address as dnsseclame in this dp,
298717d15b25SDag-Erling Smørgrav 			 * because that will make serverselection disprefer
298817d15b25SDag-Erling Smørgrav 			 * it, but also, once it is the only final option,
298917d15b25SDag-Erling Smørgrav 			 * use dnssec-lame-bypass if it needs to query there.*/
299017d15b25SDag-Erling Smørgrav 			if(qstate->reply) {
299117d15b25SDag-Erling Smørgrav 				struct delegpt_addr* a = delegpt_find_addr(
2992865f46b2SCy Schubert 					iq->dp, &qstate->reply->remote_addr,
2993865f46b2SCy Schubert 					qstate->reply->remote_addrlen);
299417d15b25SDag-Erling Smørgrav 				if(a) a->dnsseclame = 1;
299517d15b25SDag-Erling Smørgrav 			}
299617d15b25SDag-Erling Smørgrav 			/* test the answer is from the zone we expected,
2997b7579f77SDag-Erling Smørgrav 		 	 * otherwise, (due to parent,child on same server), we
2998b7579f77SDag-Erling Smørgrav 		 	 * might mark the server,zone lame inappropriately */
299917d15b25SDag-Erling Smørgrav 			if(!iter_msg_from_zone(iq->response, iq->dp, type,
300017d15b25SDag-Erling Smørgrav 				iq->qchase.qclass))
300117d15b25SDag-Erling Smørgrav 				qstate->reply = NULL;
3002b7579f77SDag-Erling Smørgrav 			type = RESPONSE_TYPE_LAME;
3003b7579f77SDag-Erling Smørgrav 			dnsseclame = 1;
3004b7579f77SDag-Erling Smørgrav 		}
3005b7579f77SDag-Erling Smørgrav 	} else iq->dnssec_lame_query = 0;
3006b7579f77SDag-Erling Smørgrav 	/* see if referral brings us close to the target */
3007b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_REFERRAL) {
3008b7579f77SDag-Erling Smørgrav 		struct ub_packed_rrset_key* ns = find_NS(
3009b7579f77SDag-Erling Smørgrav 			iq->response->rep, iq->response->rep->an_numrrsets,
3010b7579f77SDag-Erling Smørgrav 			iq->response->rep->an_numrrsets
3011b7579f77SDag-Erling Smørgrav 			+ iq->response->rep->ns_numrrsets);
3012b7579f77SDag-Erling Smørgrav 		if(!ns) ns = find_NS(iq->response->rep, 0,
3013b7579f77SDag-Erling Smørgrav 				iq->response->rep->an_numrrsets);
3014b7579f77SDag-Erling Smørgrav 		if(!ns || !dname_strict_subdomain_c(ns->rk.dname, iq->dp->name)
3015b7579f77SDag-Erling Smørgrav 			|| !dname_subdomain_c(iq->qchase.qname, ns->rk.dname)){
3016b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "bad referral, throwaway");
3017b7579f77SDag-Erling Smørgrav 			type = RESPONSE_TYPE_THROWAWAY;
3018b7579f77SDag-Erling Smørgrav 		} else
3019b7579f77SDag-Erling Smørgrav 			iter_scrub_ds(iq->response, ns, iq->dp->name);
3020b7579f77SDag-Erling Smørgrav 	} else iter_scrub_ds(iq->response, NULL, NULL);
302165b390aaSDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_THROWAWAY &&
302265b390aaSDag-Erling Smørgrav 		FLAGS_GET_RCODE(iq->response->rep->flags) == LDNS_RCODE_YXDOMAIN) {
302365b390aaSDag-Erling Smørgrav 		/* YXDOMAIN is a permanent error, no need to retry */
302465b390aaSDag-Erling Smørgrav 		type = RESPONSE_TYPE_ANSWER;
302565b390aaSDag-Erling Smørgrav 	}
3026*8f76bb7dSCy Schubert 	if(type == RESPONSE_TYPE_CNAME)
3027*8f76bb7dSCy Schubert 		origtypecname = 1;
302865b390aaSDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_CNAME && iq->response->rep->an_numrrsets >= 1
302965b390aaSDag-Erling Smørgrav 		&& ntohs(iq->response->rep->rrsets[0]->rk.type) == LDNS_RR_TYPE_DNAME) {
303065b390aaSDag-Erling Smørgrav 		uint8_t* sname = NULL;
303165b390aaSDag-Erling Smørgrav 		size_t snamelen = 0;
303265b390aaSDag-Erling Smørgrav 		get_cname_target(iq->response->rep->rrsets[0], &sname,
303365b390aaSDag-Erling Smørgrav 			&snamelen);
303465b390aaSDag-Erling Smørgrav 		if(snamelen && dname_subdomain_c(sname, iq->response->rep->rrsets[0]->rk.dname)) {
303565b390aaSDag-Erling Smørgrav 			/* DNAME to a subdomain loop; do not recurse */
303665b390aaSDag-Erling Smørgrav 			type = RESPONSE_TYPE_ANSWER;
303765b390aaSDag-Erling Smørgrav 		}
30384c75e3aaSDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_CNAME &&
30394c75e3aaSDag-Erling Smørgrav 		iq->qchase.qtype == LDNS_RR_TYPE_CNAME &&
30404c75e3aaSDag-Erling Smørgrav 		iq->minimisation_state == MINIMISE_STATE &&
30414c75e3aaSDag-Erling Smørgrav 		query_dname_compare(iq->qchase.qname, iq->qinfo_out.qname) == 0) {
30424c75e3aaSDag-Erling Smørgrav 		/* The minimised query for full QTYPE and hidden QTYPE can be
30434c75e3aaSDag-Erling Smørgrav 		 * classified as CNAME response type, even when the original
30444c75e3aaSDag-Erling Smørgrav 		 * QTYPE=CNAME. This should be treated as answer response type.
30454c75e3aaSDag-Erling Smørgrav 		 */
30464c75e3aaSDag-Erling Smørgrav 		type = RESPONSE_TYPE_ANSWER;
304765b390aaSDag-Erling Smørgrav 	}
3048b7579f77SDag-Erling Smørgrav 
3049b7579f77SDag-Erling Smørgrav 	/* handle each of the type cases */
3050b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_ANSWER) {
3051b7579f77SDag-Erling Smørgrav 		/* ANSWER type responses terminate the query algorithm,
3052b7579f77SDag-Erling Smørgrav 		 * so they sent on their */
3053b7579f77SDag-Erling Smørgrav 		if(verbosity >= VERB_DETAIL) {
3054b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "query response was %s",
3055b7579f77SDag-Erling Smørgrav 				FLAGS_GET_RCODE(iq->response->rep->flags)
3056b7579f77SDag-Erling Smørgrav 				==LDNS_RCODE_NXDOMAIN?"NXDOMAIN ANSWER":
3057b7579f77SDag-Erling Smørgrav 				(iq->response->rep->an_numrrsets?"ANSWER":
3058b7579f77SDag-Erling Smørgrav 				"nodata ANSWER"));
3059b7579f77SDag-Erling Smørgrav 		}
3060b7579f77SDag-Erling Smørgrav 		/* if qtype is DS, check we have the right level of answer,
3061b7579f77SDag-Erling Smørgrav 		 * like grandchild answer but we need the middle, reject it */
3062b7579f77SDag-Erling Smørgrav 		if(iq->qchase.qtype == LDNS_RR_TYPE_DS && !iq->dsns_point
3063b7579f77SDag-Erling Smørgrav 			&& !(iq->chase_flags&BIT_RD)
3064b7579f77SDag-Erling Smørgrav 			&& iter_ds_toolow(iq->response, iq->dp)
30658ed2b524SDag-Erling Smørgrav 			&& iter_dp_cangodown(&iq->qchase, iq->dp)) {
30668ed2b524SDag-Erling Smørgrav 			/* close down outstanding requests to be discarded */
30678ed2b524SDag-Erling Smørgrav 			outbound_list_clear(&iq->outlist);
30688ed2b524SDag-Erling Smørgrav 			iq->num_current_queries = 0;
30698ed2b524SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_detach_subs(
30708ed2b524SDag-Erling Smørgrav 				qstate->env->detach_subs));
30718ed2b524SDag-Erling Smørgrav 			(*qstate->env->detach_subs)(qstate);
30728ed2b524SDag-Erling Smørgrav 			iq->num_target_queries = 0;
3073b7579f77SDag-Erling Smørgrav 			return processDSNSFind(qstate, iq, id);
30748ed2b524SDag-Erling Smørgrav 		}
3075bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store)
30768ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &iq->response->qinfo,
3077a39a5a69SCy Schubert 				iq->response->rep,
3078a39a5a69SCy Schubert 				iq->qchase.qtype != iq->response->qinfo.qtype,
3079a39a5a69SCy Schubert 				qstate->prefetch_leeway,
3080b7579f77SDag-Erling Smørgrav 				iq->dp&&iq->dp->has_parent_side_NS,
3081790c6b24SCy Schubert 				qstate->region, qstate->query_flags,
3082790c6b24SCy Schubert 				qstate->qstarttime);
3083b7579f77SDag-Erling Smørgrav 		/* close down outstanding requests to be discarded */
3084b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
3085b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
3086b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
3087b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
3088b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
3089b7579f77SDag-Erling Smørgrav 		iq->num_target_queries = 0;
3090b7579f77SDag-Erling Smørgrav 		if(qstate->reply)
3091b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin,
3092865f46b2SCy Schubert 				&qstate->reply->remote_addr,
3093865f46b2SCy Schubert 				qstate->reply->remote_addrlen, qstate->region);
3094a755b6f6SDag-Erling Smørgrav 		if(iq->minimisation_state != DONOT_MINIMISE_STATE
3095a755b6f6SDag-Erling Smørgrav 			&& !(iq->chase_flags & BIT_RD)) {
309605ab2901SDag-Erling Smørgrav 			if(FLAGS_GET_RCODE(iq->response->rep->flags) !=
3097bc892140SDag-Erling Smørgrav 				LDNS_RCODE_NOERROR) {
3098e86b9096SDag-Erling Smørgrav 				if(qstate->env->cfg->qname_minimisation_strict) {
3099e86b9096SDag-Erling Smørgrav 					if(FLAGS_GET_RCODE(iq->response->rep->flags) ==
3100e86b9096SDag-Erling Smørgrav 						LDNS_RCODE_NXDOMAIN) {
3101e86b9096SDag-Erling Smørgrav 						iter_scrub_nxdomain(iq->response);
3102bc892140SDag-Erling Smørgrav 						return final_state(iq);
3103e86b9096SDag-Erling Smørgrav 					}
3104e86b9096SDag-Erling Smørgrav 					return error_response(qstate, id,
3105e86b9096SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
3106e86b9096SDag-Erling Smørgrav 				}
3107bc892140SDag-Erling Smørgrav 				/* Best effort qname-minimisation.
3108bc892140SDag-Erling Smørgrav 				 * Stop minimising and send full query when
3109bc892140SDag-Erling Smørgrav 				 * RCODE is not NOERROR. */
311005ab2901SDag-Erling Smørgrav 				iq->minimisation_state = DONOT_MINIMISE_STATE;
3111bc892140SDag-Erling Smørgrav 			}
3112e2d15004SDag-Erling Smørgrav 			if(FLAGS_GET_RCODE(iq->response->rep->flags) ==
3113*8f76bb7dSCy Schubert 				LDNS_RCODE_NXDOMAIN && !origtypecname) {
3114e2d15004SDag-Erling Smørgrav 				/* Stop resolving when NXDOMAIN is DNSSEC
31158a384985SDag-Erling Smørgrav 				 * signed. Based on assumption that nameservers
3116e2d15004SDag-Erling Smørgrav 				 * serving signed zones do not return NXDOMAIN
3117e2d15004SDag-Erling Smørgrav 				 * for empty-non-terminals. */
3118*8f76bb7dSCy Schubert 				/* If this response is actually a CNAME type,
3119*8f76bb7dSCy Schubert 				 * the nxdomain rcode may not be for the qname,
3120*8f76bb7dSCy Schubert 				 * and so it is not the final response. */
3121e2d15004SDag-Erling Smørgrav 				if(iq->dnssec_expected)
3122e2d15004SDag-Erling Smørgrav 					return final_state(iq);
3123e2d15004SDag-Erling Smørgrav 				/* Make subrequest to validate intermediate
3124e2d15004SDag-Erling Smørgrav 				 * NXDOMAIN if harden-below-nxdomain is
3125e2d15004SDag-Erling Smørgrav 				 * enabled. */
3126091e9e46SCy Schubert 				if(qstate->env->cfg->harden_below_nxdomain &&
3127091e9e46SCy Schubert 					qstate->env->need_to_validate) {
3128e2d15004SDag-Erling Smørgrav 					struct module_qstate* subq = NULL;
3129e2d15004SDag-Erling Smørgrav 					log_query_info(VERB_QUERY,
3130e2d15004SDag-Erling Smørgrav 						"schedule NXDOMAIN validation:",
3131e2d15004SDag-Erling Smørgrav 						&iq->response->qinfo);
3132e2d15004SDag-Erling Smørgrav 					if(!generate_sub_request(
3133e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qname,
3134e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qname_len,
3135e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qtype,
3136e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qclass,
3137e2d15004SDag-Erling Smørgrav 						qstate, id, iq,
3138e2d15004SDag-Erling Smørgrav 						INIT_REQUEST_STATE,
3139091e9e46SCy Schubert 						FINISHED_STATE, &subq, 1, 1))
3140e2d15004SDag-Erling Smørgrav 						verbose(VERB_ALGO,
3141e2d15004SDag-Erling Smørgrav 						"could not validate NXDOMAIN "
3142e2d15004SDag-Erling Smørgrav 						"response");
3143e2d15004SDag-Erling Smørgrav 				}
3144e2d15004SDag-Erling Smørgrav 			}
314505ab2901SDag-Erling Smørgrav 			return next_state(iq, QUERYTARGETS_STATE);
314605ab2901SDag-Erling Smørgrav 		}
3147b7579f77SDag-Erling Smørgrav 		return final_state(iq);
3148b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_REFERRAL) {
3149b7579f77SDag-Erling Smørgrav 		/* REFERRAL type responses get a reset of the
3150b7579f77SDag-Erling Smørgrav 		 * delegation point, and back to the QUERYTARGETS_STATE. */
3151b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was REFERRAL");
3152b7579f77SDag-Erling Smørgrav 
3153b7579f77SDag-Erling Smørgrav 		/* if hardened, only store referral if we asked for it */
3154bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store &&
3155bc892140SDag-Erling Smørgrav 		(!qstate->env->cfg->harden_referral_path ||
3156b7579f77SDag-Erling Smørgrav 		    (  qstate->qinfo.qtype == LDNS_RR_TYPE_NS
3157b7579f77SDag-Erling Smørgrav 			&& (qstate->query_flags&BIT_RD)
3158b7579f77SDag-Erling Smørgrav 			&& !(qstate->query_flags&BIT_CD)
3159b7579f77SDag-Erling Smørgrav 			   /* we know that all other NS rrsets are scrubbed
3160b7579f77SDag-Erling Smørgrav 			    * away, thus on referral only one is left.
3161b7579f77SDag-Erling Smørgrav 			    * see if that equals the query name... */
3162b7579f77SDag-Erling Smørgrav 			&& ( /* auth section, but sometimes in answer section*/
3163b7579f77SDag-Erling Smørgrav 			  reply_find_rrset_section_ns(iq->response->rep,
3164b7579f77SDag-Erling Smørgrav 				iq->qchase.qname, iq->qchase.qname_len,
3165b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_NS, iq->qchase.qclass)
3166b7579f77SDag-Erling Smørgrav 			  || reply_find_rrset_section_an(iq->response->rep,
3167b7579f77SDag-Erling Smørgrav 				iq->qchase.qname, iq->qchase.qname_len,
3168b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_NS, iq->qchase.qclass)
3169b7579f77SDag-Erling Smørgrav 			  )
3170bc892140SDag-Erling Smørgrav 		    ))) {
3171b7579f77SDag-Erling Smørgrav 			/* Store the referral under the current query */
3172b7579f77SDag-Erling Smørgrav 			/* no prefetch-leeway, since its not the answer */
31738ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &iq->response->qinfo,
3174790c6b24SCy Schubert 				iq->response->rep, 1, 0, 0, NULL, 0,
3175790c6b24SCy Schubert 				qstate->qstarttime);
3176b7579f77SDag-Erling Smørgrav 			if(iq->store_parent_NS)
3177b7579f77SDag-Erling Smørgrav 				iter_store_parentside_NS(qstate->env,
3178b7579f77SDag-Erling Smørgrav 					iq->response->rep);
3179b7579f77SDag-Erling Smørgrav 			if(qstate->env->neg_cache)
3180b7579f77SDag-Erling Smørgrav 				val_neg_addreferral(qstate->env->neg_cache,
3181b7579f77SDag-Erling Smørgrav 					iq->response->rep, iq->dp->name);
3182b7579f77SDag-Erling Smørgrav 		}
3183b7579f77SDag-Erling Smørgrav 		/* store parent-side-in-zone-glue, if directly queried for */
3184bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store && iq->query_for_pside_glue
3185bc892140SDag-Erling Smørgrav 			&& !iq->pside_glue) {
3186b7579f77SDag-Erling Smørgrav 				iq->pside_glue = reply_find_rrset(iq->response->rep,
3187b7579f77SDag-Erling Smørgrav 					iq->qchase.qname, iq->qchase.qname_len,
3188b7579f77SDag-Erling Smørgrav 					iq->qchase.qtype, iq->qchase.qclass);
3189b7579f77SDag-Erling Smørgrav 				if(iq->pside_glue) {
3190b7579f77SDag-Erling Smørgrav 					log_rrset_key(VERB_ALGO, "found parent-side "
3191b7579f77SDag-Erling Smørgrav 						"glue", iq->pside_glue);
3192b7579f77SDag-Erling Smørgrav 					iter_store_parentside_rrset(qstate->env,
3193b7579f77SDag-Erling Smørgrav 						iq->pside_glue);
3194b7579f77SDag-Erling Smørgrav 				}
3195b7579f77SDag-Erling Smørgrav 		}
3196b7579f77SDag-Erling Smørgrav 
3197b7579f77SDag-Erling Smørgrav 		/* Reset the event state, setting the current delegation
3198b7579f77SDag-Erling Smørgrav 		 * point to the referral. */
3199b7579f77SDag-Erling Smørgrav 		iq->deleg_msg = iq->response;
3200b7579f77SDag-Erling Smørgrav 		iq->dp = delegpt_from_message(iq->response, qstate->region);
320105ab2901SDag-Erling Smørgrav 		if (qstate->env->cfg->qname_minimisation)
320205ab2901SDag-Erling Smørgrav 			iq->minimisation_state = INIT_MINIMISE_STATE;
32034c75e3aaSDag-Erling Smørgrav 		if(!iq->dp) {
32044c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, for delegation point");
3205b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
32064c75e3aaSDag-Erling Smørgrav 		}
3207b7579f77SDag-Erling Smørgrav 		if(!cache_fill_missing(qstate->env, iq->qchase.qclass,
32084c75e3aaSDag-Erling Smørgrav 			qstate->region, iq->dp)) {
32094c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, copy extra info into delegation point");
3210b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
32114c75e3aaSDag-Erling Smørgrav 		}
3212b7579f77SDag-Erling Smørgrav 		if(iq->store_parent_NS && query_dname_compare(iq->dp->name,
3213b7579f77SDag-Erling Smørgrav 			iq->store_parent_NS->name) == 0)
321424e36522SCy Schubert 			iter_merge_retry_counts(iq->dp, iq->store_parent_NS,
321524e36522SCy Schubert 				ie->outbound_msg_retry);
3216b7579f77SDag-Erling Smørgrav 		delegpt_log(VERB_ALGO, iq->dp);
3217b7579f77SDag-Erling Smørgrav 		/* Count this as a referral. */
3218b7579f77SDag-Erling Smørgrav 		iq->referral_count++;
3219b7579f77SDag-Erling Smørgrav 		iq->sent_count = 0;
3220091e9e46SCy Schubert 		iq->dp_target_count = 0;
3221b7579f77SDag-Erling Smørgrav 		/* see if the next dp is a trust anchor, or a DS was sent
3222b7579f77SDag-Erling Smørgrav 		 * along, indicating dnssec is expected for next zone */
3223b7579f77SDag-Erling Smørgrav 		iq->dnssec_expected = iter_indicates_dnssec(qstate->env,
3224b7579f77SDag-Erling Smørgrav 			iq->dp, iq->response, iq->qchase.qclass);
3225b7579f77SDag-Erling Smørgrav 		/* if dnssec, validating then also fetch the key for the DS */
3226b7579f77SDag-Erling Smørgrav 		if(iq->dnssec_expected && qstate->env->cfg->prefetch_key &&
3227b7579f77SDag-Erling Smørgrav 			!(qstate->query_flags&BIT_CD))
3228b7579f77SDag-Erling Smørgrav 			generate_dnskey_prefetch(qstate, iq, id);
3229b7579f77SDag-Erling Smørgrav 
3230b7579f77SDag-Erling Smørgrav 		/* spawn off NS and addr to auth servers for the NS we just
3231b7579f77SDag-Erling Smørgrav 		 * got in the referral. This gets authoritative answer
3232b7579f77SDag-Erling Smørgrav 		 * (answer section trust level) rrset.
3233b7579f77SDag-Erling Smørgrav 		 * right after, we detach the subs, answer goes to cache. */
3234b7579f77SDag-Erling Smørgrav 		if(qstate->env->cfg->harden_referral_path)
3235b7579f77SDag-Erling Smørgrav 			generate_ns_check(qstate, iq, id);
3236b7579f77SDag-Erling Smørgrav 
3237b7579f77SDag-Erling Smørgrav 		/* stop current outstanding queries.
3238b7579f77SDag-Erling Smørgrav 		 * FIXME: should the outstanding queries be waited for and
3239b7579f77SDag-Erling Smørgrav 		 * handled? Say by a subquery that inherits the outbound_entry.
3240b7579f77SDag-Erling Smørgrav 		 */
3241b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
3242b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
3243b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
3244b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
3245b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
3246b7579f77SDag-Erling Smørgrav 		iq->num_target_queries = 0;
32475469a995SCy Schubert 		iq->response = NULL;
3248*8f76bb7dSCy Schubert 		iq->fail_addr_type = 0;
3249b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "cleared outbound list for next round");
3250b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
3251b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_CNAME) {
3252b7579f77SDag-Erling Smørgrav 		uint8_t* sname = NULL;
3253b7579f77SDag-Erling Smørgrav 		size_t snamelen = 0;
3254b7579f77SDag-Erling Smørgrav 		/* CNAME type responses get a query restart (i.e., get a
3255b7579f77SDag-Erling Smørgrav 		 * reset of the query state and go back to INIT_REQUEST_STATE).
3256b7579f77SDag-Erling Smørgrav 		 */
3257b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was CNAME");
3258b7579f77SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO)
3259b7579f77SDag-Erling Smørgrav 			log_dns_msg("cname msg", &iq->response->qinfo,
3260b7579f77SDag-Erling Smørgrav 				iq->response->rep);
3261b7579f77SDag-Erling Smørgrav 		/* if qtype is DS, check we have the right level of answer,
3262b7579f77SDag-Erling Smørgrav 		 * like grandchild answer but we need the middle, reject it */
3263b7579f77SDag-Erling Smørgrav 		if(iq->qchase.qtype == LDNS_RR_TYPE_DS && !iq->dsns_point
3264b7579f77SDag-Erling Smørgrav 			&& !(iq->chase_flags&BIT_RD)
3265b7579f77SDag-Erling Smørgrav 			&& iter_ds_toolow(iq->response, iq->dp)
32668ed2b524SDag-Erling Smørgrav 			&& iter_dp_cangodown(&iq->qchase, iq->dp)) {
32678ed2b524SDag-Erling Smørgrav 			outbound_list_clear(&iq->outlist);
32688ed2b524SDag-Erling Smørgrav 			iq->num_current_queries = 0;
32698ed2b524SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_detach_subs(
32708ed2b524SDag-Erling Smørgrav 				qstate->env->detach_subs));
32718ed2b524SDag-Erling Smørgrav 			(*qstate->env->detach_subs)(qstate);
32728ed2b524SDag-Erling Smørgrav 			iq->num_target_queries = 0;
3273b7579f77SDag-Erling Smørgrav 			return processDSNSFind(qstate, iq, id);
32748ed2b524SDag-Erling Smørgrav 		}
3275b7579f77SDag-Erling Smørgrav 		/* Process the CNAME response. */
3276b7579f77SDag-Erling Smørgrav 		if(!handle_cname_response(qstate, iq, iq->response,
32774c75e3aaSDag-Erling Smørgrav 			&sname, &snamelen)) {
32784c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, CNAME info");
3279b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
32804c75e3aaSDag-Erling Smørgrav 		}
3281b7579f77SDag-Erling Smørgrav 		/* cache the CNAME response under the current query */
3282b7579f77SDag-Erling Smørgrav 		/* NOTE : set referral=1, so that rrsets get stored but not
3283b7579f77SDag-Erling Smørgrav 		 * the partial query answer (CNAME only). */
3284b7579f77SDag-Erling Smørgrav 		/* prefetchleeway applied because this updates answer parts */
3285bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store)
32868ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &iq->response->qinfo,
3287b7579f77SDag-Erling Smørgrav 				iq->response->rep, 1, qstate->prefetch_leeway,
3288ff825849SDag-Erling Smørgrav 				iq->dp&&iq->dp->has_parent_side_NS, NULL,
3289790c6b24SCy Schubert 				qstate->query_flags, qstate->qstarttime);
3290b7579f77SDag-Erling Smørgrav 		/* set the current request's qname to the new value. */
3291b7579f77SDag-Erling Smørgrav 		iq->qchase.qname = sname;
3292b7579f77SDag-Erling Smørgrav 		iq->qchase.qname_len = snamelen;
329324e36522SCy Schubert 		if(qstate->env->auth_zones) {
329424e36522SCy Schubert 			/* apply rpz qname triggers after cname */
329524e36522SCy Schubert 			struct dns_msg* forged_response =
329624e36522SCy Schubert 				rpz_callback_from_iterator_cname(qstate, iq);
329724e36522SCy Schubert 			while(forged_response && reply_find_rrset_section_an(
329824e36522SCy Schubert 				forged_response->rep, iq->qchase.qname,
329924e36522SCy Schubert 				iq->qchase.qname_len, LDNS_RR_TYPE_CNAME,
330024e36522SCy Schubert 				iq->qchase.qclass)) {
330124e36522SCy Schubert 				/* another cname to follow */
330224e36522SCy Schubert 				if(!handle_cname_response(qstate, iq, forged_response,
330324e36522SCy Schubert 					&sname, &snamelen)) {
330424e36522SCy Schubert 					errinf(qstate, "malloc failure, CNAME info");
330524e36522SCy Schubert 					return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
330624e36522SCy Schubert 				}
330724e36522SCy Schubert 				iq->qchase.qname = sname;
330824e36522SCy Schubert 				iq->qchase.qname_len = snamelen;
330924e36522SCy Schubert 				forged_response =
331024e36522SCy Schubert 					rpz_callback_from_iterator_cname(qstate, iq);
331124e36522SCy Schubert 			}
331224e36522SCy Schubert 			if(forged_response != NULL) {
331324e36522SCy Schubert 				qstate->ext_state[id] = module_finished;
33149cf5bc93SCy Schubert 				qstate->return_rcode = LDNS_RCODE_NOERROR;
331524e36522SCy Schubert 				qstate->return_msg = forged_response;
331624e36522SCy Schubert 				iq->response = forged_response;
331724e36522SCy Schubert 				next_state(iq, FINISHED_STATE);
331824e36522SCy Schubert 				if(!iter_prepend(iq, qstate->return_msg, qstate->region)) {
3319a39a5a69SCy Schubert 					log_err("rpz: after cname, prepend rrsets: out of memory");
332024e36522SCy Schubert 					return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
332124e36522SCy Schubert 				}
332224e36522SCy Schubert 				qstate->return_msg->qinfo = qstate->qinfo;
332324e36522SCy Schubert 				return 0;
332424e36522SCy Schubert 			}
332524e36522SCy Schubert 		}
3326b7579f77SDag-Erling Smørgrav 		/* Clear the query state, since this is a query restart. */
3327b7579f77SDag-Erling Smørgrav 		iq->deleg_msg = NULL;
3328b7579f77SDag-Erling Smørgrav 		iq->dp = NULL;
3329b7579f77SDag-Erling Smørgrav 		iq->dsns_point = NULL;
333057bddd21SDag-Erling Smørgrav 		iq->auth_zone_response = 0;
3331b7579f77SDag-Erling Smørgrav 		iq->sent_count = 0;
3332091e9e46SCy Schubert 		iq->dp_target_count = 0;
33337da0adf7SDag-Erling Smørgrav 		if(iq->minimisation_state != MINIMISE_STATE)
33347da0adf7SDag-Erling Smørgrav 			/* Only count as query restart when it is not an extra
33357da0adf7SDag-Erling Smørgrav 			 * query as result of qname minimisation. */
33367da0adf7SDag-Erling Smørgrav 			iq->query_restart_count++;
33377da0adf7SDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation)
33387da0adf7SDag-Erling Smørgrav 			iq->minimisation_state = INIT_MINIMISE_STATE;
3339b7579f77SDag-Erling Smørgrav 
3340b7579f77SDag-Erling Smørgrav 		/* stop current outstanding queries.
3341b7579f77SDag-Erling Smørgrav 		 * FIXME: should the outstanding queries be waited for and
3342b7579f77SDag-Erling Smørgrav 		 * handled? Say by a subquery that inherits the outbound_entry.
3343b7579f77SDag-Erling Smørgrav 		 */
3344b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
3345b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
3346b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
3347b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
3348b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
3349b7579f77SDag-Erling Smørgrav 		iq->num_target_queries = 0;
3350b7579f77SDag-Erling Smørgrav 		if(qstate->reply)
3351b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin,
3352865f46b2SCy Schubert 				&qstate->reply->remote_addr,
3353865f46b2SCy Schubert 				qstate->reply->remote_addrlen, qstate->region);
3354b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "cleared outbound list for query restart");
3355b7579f77SDag-Erling Smørgrav 		/* go to INIT_REQUEST_STATE for new qname. */
3356b7579f77SDag-Erling Smørgrav 		return next_state(iq, INIT_REQUEST_STATE);
3357b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_LAME) {
3358b7579f77SDag-Erling Smørgrav 		/* Cache the LAMEness. */
3359b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was %sLAME",
3360b7579f77SDag-Erling Smørgrav 			dnsseclame?"DNSSEC ":"");
3361b7579f77SDag-Erling Smørgrav 		if(!dname_subdomain_c(iq->qchase.qname, iq->dp->name)) {
3362b7579f77SDag-Erling Smørgrav 			log_err("mark lame: mismatch in qname and dpname");
3363b7579f77SDag-Erling Smørgrav 			/* throwaway this reply below */
3364b7579f77SDag-Erling Smørgrav 		} else if(qstate->reply) {
3365b7579f77SDag-Erling Smørgrav 			/* need addr for lameness cache, but we may have
3366b7579f77SDag-Erling Smørgrav 			 * gotten this from cache, so test to be sure */
3367b7579f77SDag-Erling Smørgrav 			if(!infra_set_lame(qstate->env->infra_cache,
3368865f46b2SCy Schubert 				&qstate->reply->remote_addr,
3369865f46b2SCy Schubert 				qstate->reply->remote_addrlen,
3370b7579f77SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
3371b7579f77SDag-Erling Smørgrav 				*qstate->env->now, dnsseclame, 0,
3372b7579f77SDag-Erling Smørgrav 				iq->qchase.qtype))
3373b7579f77SDag-Erling Smørgrav 				log_err("mark host lame: out of memory");
337417d15b25SDag-Erling Smørgrav 		}
3375b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_REC_LAME) {
3376b7579f77SDag-Erling Smørgrav 		/* Cache the LAMEness. */
3377b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response REC_LAME: "
3378b7579f77SDag-Erling Smørgrav 			"recursive but not authoritative server");
3379b7579f77SDag-Erling Smørgrav 		if(!dname_subdomain_c(iq->qchase.qname, iq->dp->name)) {
3380b7579f77SDag-Erling Smørgrav 			log_err("mark rec_lame: mismatch in qname and dpname");
3381b7579f77SDag-Erling Smørgrav 			/* throwaway this reply below */
3382b7579f77SDag-Erling Smørgrav 		} else if(qstate->reply) {
3383b7579f77SDag-Erling Smørgrav 			/* need addr for lameness cache, but we may have
3384b7579f77SDag-Erling Smørgrav 			 * gotten this from cache, so test to be sure */
3385b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "mark as REC_LAME");
3386b7579f77SDag-Erling Smørgrav 			if(!infra_set_lame(qstate->env->infra_cache,
3387865f46b2SCy Schubert 				&qstate->reply->remote_addr,
3388865f46b2SCy Schubert 				qstate->reply->remote_addrlen,
3389b7579f77SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
3390b7579f77SDag-Erling Smørgrav 				*qstate->env->now, 0, 1, iq->qchase.qtype))
3391b7579f77SDag-Erling Smørgrav 				log_err("mark host lame: out of memory");
3392b7579f77SDag-Erling Smørgrav 		}
3393b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_THROWAWAY) {
3394b7579f77SDag-Erling Smørgrav 		/* LAME and THROWAWAY responses are handled the same way.
3395b7579f77SDag-Erling Smørgrav 		 * In this case, the event is just sent directly back to
3396b7579f77SDag-Erling Smørgrav 		 * the QUERYTARGETS_STATE without resetting anything,
3397b7579f77SDag-Erling Smørgrav 		 * because, clearly, the next target must be tried. */
3398b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was THROWAWAY");
3399b7579f77SDag-Erling Smørgrav 	} else {
3400b7579f77SDag-Erling Smørgrav 		log_warn("A query response came back with an unknown type: %d",
3401b7579f77SDag-Erling Smørgrav 			(int)type);
3402b7579f77SDag-Erling Smørgrav 	}
3403b7579f77SDag-Erling Smørgrav 
3404b7579f77SDag-Erling Smørgrav 	/* LAME, THROWAWAY and "unknown" all end up here.
3405b7579f77SDag-Erling Smørgrav 	 * Recycle to the QUERYTARGETS state to hopefully try a
3406b7579f77SDag-Erling Smørgrav 	 * different target. */
3407bc892140SDag-Erling Smørgrav 	if (qstate->env->cfg->qname_minimisation &&
3408bc892140SDag-Erling Smørgrav 		!qstate->env->cfg->qname_minimisation_strict)
340905ab2901SDag-Erling Smørgrav 		iq->minimisation_state = DONOT_MINIMISE_STATE;
341057bddd21SDag-Erling Smørgrav 	if(iq->auth_zone_response) {
341157bddd21SDag-Erling Smørgrav 		/* can we fallback? */
341257bddd21SDag-Erling Smørgrav 		iq->auth_zone_response = 0;
341357bddd21SDag-Erling Smørgrav 		if(!auth_zones_can_fallback(qstate->env->auth_zones,
341457bddd21SDag-Erling Smørgrav 			iq->dp->name, iq->dp->namelen, qstate->qinfo.qclass)) {
341557bddd21SDag-Erling Smørgrav 			verbose(VERB_ALGO, "auth zone response bad, and no"
341657bddd21SDag-Erling Smørgrav 				" fallback possible, servfail");
3417a755b6f6SDag-Erling Smørgrav 			errinf_dname(qstate, "response is bad, no fallback, "
34184c75e3aaSDag-Erling Smørgrav 				"for auth zone", iq->dp->name);
341957bddd21SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
342057bddd21SDag-Erling Smørgrav 		}
342157bddd21SDag-Erling Smørgrav 		verbose(VERB_ALGO, "auth zone response was bad, "
342257bddd21SDag-Erling Smørgrav 			"fallback enabled");
342357bddd21SDag-Erling Smørgrav 		iq->auth_zone_avoid = 1;
342457bddd21SDag-Erling Smørgrav 		if(iq->dp->auth_dp) {
342557bddd21SDag-Erling Smørgrav 			/* we are using a dp for the auth zone, with no
342657bddd21SDag-Erling Smørgrav 			 * nameservers, get one first */
342757bddd21SDag-Erling Smørgrav 			iq->dp = NULL;
342857bddd21SDag-Erling Smørgrav 			return next_state(iq, INIT_REQUEST_STATE);
342957bddd21SDag-Erling Smørgrav 		}
343057bddd21SDag-Erling Smørgrav 	}
3431b7579f77SDag-Erling Smørgrav 	return next_state(iq, QUERYTARGETS_STATE);
3432b7579f77SDag-Erling Smørgrav }
3433b7579f77SDag-Erling Smørgrav 
3434b7579f77SDag-Erling Smørgrav /**
3435ff825849SDag-Erling Smørgrav  * Return priming query results to interested super querystates.
3436b7579f77SDag-Erling Smørgrav  *
3437b7579f77SDag-Erling Smørgrav  * Sets the delegation point and delegation message (not nonRD queries).
3438b7579f77SDag-Erling Smørgrav  * This is a callback from walk_supers.
3439b7579f77SDag-Erling Smørgrav  *
3440b7579f77SDag-Erling Smørgrav  * @param qstate: priming query state that finished.
3441b7579f77SDag-Erling Smørgrav  * @param id: module id.
3442b7579f77SDag-Erling Smørgrav  * @param forq: the qstate for which priming has been done.
3443b7579f77SDag-Erling Smørgrav  */
3444b7579f77SDag-Erling Smørgrav static void
3445b7579f77SDag-Erling Smørgrav prime_supers(struct module_qstate* qstate, int id, struct module_qstate* forq)
3446b7579f77SDag-Erling Smørgrav {
3447b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
3448b7579f77SDag-Erling Smørgrav 	struct delegpt* dp = NULL;
3449b7579f77SDag-Erling Smørgrav 
3450b7579f77SDag-Erling Smørgrav 	log_assert(qstate->is_priming || foriq->wait_priming_stub);
3451b7579f77SDag-Erling Smørgrav 	log_assert(qstate->return_rcode == LDNS_RCODE_NOERROR);
3452b7579f77SDag-Erling Smørgrav 	/* Convert our response to a delegation point */
3453b7579f77SDag-Erling Smørgrav 	dp = delegpt_from_message(qstate->return_msg, forq->region);
3454b7579f77SDag-Erling Smørgrav 	if(!dp) {
345524e36522SCy Schubert 		/* if there is no convertible delegation point, then
3456b7579f77SDag-Erling Smørgrav 		 * the ANSWER type was (presumably) a negative answer. */
3457b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "prime response was not a positive "
3458b7579f77SDag-Erling Smørgrav 			"ANSWER; failing");
3459b7579f77SDag-Erling Smørgrav 		foriq->dp = NULL;
3460b7579f77SDag-Erling Smørgrav 		foriq->state = QUERYTARGETS_STATE;
3461b7579f77SDag-Erling Smørgrav 		return;
3462b7579f77SDag-Erling Smørgrav 	}
3463b7579f77SDag-Erling Smørgrav 
3464b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_DETAIL, "priming successful for", &qstate->qinfo);
3465b7579f77SDag-Erling Smørgrav 	delegpt_log(VERB_ALGO, dp);
3466b7579f77SDag-Erling Smørgrav 	foriq->dp = dp;
3467b7579f77SDag-Erling Smørgrav 	foriq->deleg_msg = dns_copy_msg(qstate->return_msg, forq->region);
3468b7579f77SDag-Erling Smørgrav 	if(!foriq->deleg_msg) {
3469b7579f77SDag-Erling Smørgrav 		log_err("copy prime response: out of memory");
3470b7579f77SDag-Erling Smørgrav 		foriq->dp = NULL;
3471b7579f77SDag-Erling Smørgrav 		foriq->state = QUERYTARGETS_STATE;
3472b7579f77SDag-Erling Smørgrav 		return;
3473b7579f77SDag-Erling Smørgrav 	}
3474b7579f77SDag-Erling Smørgrav 
3475b7579f77SDag-Erling Smørgrav 	/* root priming responses go to init stage 2, priming stub
3476b7579f77SDag-Erling Smørgrav 	 * responses to to stage 3. */
3477b7579f77SDag-Erling Smørgrav 	if(foriq->wait_priming_stub) {
3478b7579f77SDag-Erling Smørgrav 		foriq->state = INIT_REQUEST_3_STATE;
3479b7579f77SDag-Erling Smørgrav 		foriq->wait_priming_stub = 0;
3480b7579f77SDag-Erling Smørgrav 	} else	foriq->state = INIT_REQUEST_2_STATE;
3481b7579f77SDag-Erling Smørgrav 	/* because we are finished, the parent will be reactivated */
3482b7579f77SDag-Erling Smørgrav }
3483b7579f77SDag-Erling Smørgrav 
3484b7579f77SDag-Erling Smørgrav /**
3485b7579f77SDag-Erling Smørgrav  * This handles the response to a priming query. This is used to handle both
3486b7579f77SDag-Erling Smørgrav  * root and stub priming responses. This is basically the equivalent of the
3487b7579f77SDag-Erling Smørgrav  * QUERY_RESP_STATE, but will not handle CNAME responses and will treat
3488b7579f77SDag-Erling Smørgrav  * REFERRALs as ANSWERS. It will also update and reactivate the originating
3489b7579f77SDag-Erling Smørgrav  * event.
3490b7579f77SDag-Erling Smørgrav  *
3491b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3492b7579f77SDag-Erling Smørgrav  * @param id: module id.
3493b7579f77SDag-Erling Smørgrav  * @return true if the event needs more immediate processing, false if not.
3494b7579f77SDag-Erling Smørgrav  *         This state always returns false.
3495b7579f77SDag-Erling Smørgrav  */
3496b7579f77SDag-Erling Smørgrav static int
3497b7579f77SDag-Erling Smørgrav processPrimeResponse(struct module_qstate* qstate, int id)
3498b7579f77SDag-Erling Smørgrav {
3499b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
3500b7579f77SDag-Erling Smørgrav 	enum response_type type;
3501b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags &= ~(BIT_RD|BIT_RA); /* ignore rec-lame */
3502b7579f77SDag-Erling Smørgrav 	type = response_type_from_server(
3503b7579f77SDag-Erling Smørgrav 		(int)((iq->chase_flags&BIT_RD) || iq->chase_to_rd),
3504b7579f77SDag-Erling Smørgrav 		iq->response, &iq->qchase, iq->dp);
3505b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_ANSWER) {
3506b7579f77SDag-Erling Smørgrav 		qstate->return_rcode = LDNS_RCODE_NOERROR;
3507b7579f77SDag-Erling Smørgrav 		qstate->return_msg = iq->response;
3508b7579f77SDag-Erling Smørgrav 	} else {
35094c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "prime response did not get an answer");
35104c75e3aaSDag-Erling Smørgrav 		errinf_dname(qstate, "for", qstate->qinfo.qname);
3511b7579f77SDag-Erling Smørgrav 		qstate->return_rcode = LDNS_RCODE_SERVFAIL;
3512b7579f77SDag-Erling Smørgrav 		qstate->return_msg = NULL;
3513b7579f77SDag-Erling Smørgrav 	}
3514b7579f77SDag-Erling Smørgrav 
3515b7579f77SDag-Erling Smørgrav 	/* validate the root or stub after priming (if enabled).
3516b7579f77SDag-Erling Smørgrav 	 * This is the same query as the prime query, but with validation.
3517b7579f77SDag-Erling Smørgrav 	 * Now that we are primed, the additional queries that validation
3518c0caa2e2SCy Schubert 	 * may need can be resolved. */
3519b7579f77SDag-Erling Smørgrav 	if(qstate->env->cfg->harden_referral_path) {
3520b7579f77SDag-Erling Smørgrav 		struct module_qstate* subq = NULL;
3521b7579f77SDag-Erling Smørgrav 		log_nametypeclass(VERB_ALGO, "schedule prime validation",
3522b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qname, qstate->qinfo.qtype,
3523b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qclass);
3524b7579f77SDag-Erling Smørgrav 		if(!generate_sub_request(qstate->qinfo.qname,
3525b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qname_len, qstate->qinfo.qtype,
3526b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qclass, qstate, id, iq,
3527091e9e46SCy Schubert 			INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1, 0)) {
3528b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "could not generate prime check");
3529b7579f77SDag-Erling Smørgrav 		}
3530b7579f77SDag-Erling Smørgrav 		generate_a_aaaa_check(qstate, iq, id);
3531b7579f77SDag-Erling Smørgrav 	}
3532b7579f77SDag-Erling Smørgrav 
3533b7579f77SDag-Erling Smørgrav 	/* This event is finished. */
3534b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_finished;
3535b7579f77SDag-Erling Smørgrav 	return 0;
3536b7579f77SDag-Erling Smørgrav }
3537b7579f77SDag-Erling Smørgrav 
3538b7579f77SDag-Erling Smørgrav /**
3539b7579f77SDag-Erling Smørgrav  * Do final processing on responses to target queries. Events reach this
3540b7579f77SDag-Erling Smørgrav  * state after the iterative resolution algorithm terminates. This state is
35418a384985SDag-Erling Smørgrav  * responsible for reactivating the original event, and housekeeping related
3542b7579f77SDag-Erling Smørgrav  * to received target responses (caching, updating the current delegation
3543b7579f77SDag-Erling Smørgrav  * point, etc).
3544b7579f77SDag-Erling Smørgrav  * Callback from walk_supers for every super state that is interested in
3545b7579f77SDag-Erling Smørgrav  * the results from this query.
3546b7579f77SDag-Erling Smørgrav  *
3547b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3548b7579f77SDag-Erling Smørgrav  * @param id: module id.
3549b7579f77SDag-Erling Smørgrav  * @param forq: super query state.
3550b7579f77SDag-Erling Smørgrav  */
3551b7579f77SDag-Erling Smørgrav static void
3552b7579f77SDag-Erling Smørgrav processTargetResponse(struct module_qstate* qstate, int id,
3553b7579f77SDag-Erling Smørgrav 	struct module_qstate* forq)
3554b7579f77SDag-Erling Smørgrav {
3555091e9e46SCy Schubert 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
3556b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
3557b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
3558b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset;
3559b7579f77SDag-Erling Smørgrav 	struct delegpt_ns* dpns;
3560b7579f77SDag-Erling Smørgrav 	log_assert(qstate->return_rcode == LDNS_RCODE_NOERROR);
3561b7579f77SDag-Erling Smørgrav 
3562b7579f77SDag-Erling Smørgrav 	foriq->state = QUERYTARGETS_STATE;
3563b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processTargetResponse", &qstate->qinfo);
3564b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processTargetResponse super", &forq->qinfo);
3565b7579f77SDag-Erling Smørgrav 
3566b5663de9SDag-Erling Smørgrav 	/* Tell the originating event that this target query has finished
3567b5663de9SDag-Erling Smørgrav 	 * (regardless if it succeeded or not). */
3568b5663de9SDag-Erling Smørgrav 	foriq->num_target_queries--;
3569b5663de9SDag-Erling Smørgrav 
3570b7579f77SDag-Erling Smørgrav 	/* check to see if parent event is still interested (in orig name).  */
3571b7579f77SDag-Erling Smørgrav 	if(!foriq->dp) {
3572b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "subq: parent not interested, was reset");
3573b7579f77SDag-Erling Smørgrav 		return; /* not interested anymore */
3574b7579f77SDag-Erling Smørgrav 	}
3575b7579f77SDag-Erling Smørgrav 	dpns = delegpt_find_ns(foriq->dp, qstate->qinfo.qname,
3576b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qname_len);
3577b7579f77SDag-Erling Smørgrav 	if(!dpns) {
3578b7579f77SDag-Erling Smørgrav 		/* If not interested, just stop processing this event */
3579b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "subq: parent not interested anymore");
3580b7579f77SDag-Erling Smørgrav 		/* could be because parent was jostled out of the cache,
3581b7579f77SDag-Erling Smørgrav 		   and a new identical query arrived, that does not want it*/
3582b7579f77SDag-Erling Smørgrav 		return;
3583b7579f77SDag-Erling Smørgrav 	}
3584b7579f77SDag-Erling Smørgrav 
3585b7579f77SDag-Erling Smørgrav 	/* if iq->query_for_pside_glue then add the pside_glue (marked lame) */
3586b7579f77SDag-Erling Smørgrav 	if(iq->pside_glue) {
3587b7579f77SDag-Erling Smørgrav 		/* if the pside_glue is NULL, then it could not be found,
3588b7579f77SDag-Erling Smørgrav 		 * the done_pside is already set when created and a cache
3589b7579f77SDag-Erling Smørgrav 		 * entry created in processFinished so nothing to do here */
3590b7579f77SDag-Erling Smørgrav 		log_rrset_key(VERB_ALGO, "add parentside glue to dp",
3591b7579f77SDag-Erling Smørgrav 			iq->pside_glue);
3592b7579f77SDag-Erling Smørgrav 		if(!delegpt_add_rrset(foriq->dp, forq->region,
3593091e9e46SCy Schubert 			iq->pside_glue, 1, NULL))
3594b7579f77SDag-Erling Smørgrav 			log_err("out of memory adding pside glue");
3595b7579f77SDag-Erling Smørgrav 	}
3596b7579f77SDag-Erling Smørgrav 
3597b7579f77SDag-Erling Smørgrav 	/* This response is relevant to the current query, so we
3598b7579f77SDag-Erling Smørgrav 	 * add (attempt to add, anyway) this target(s) and reactivate
3599b7579f77SDag-Erling Smørgrav 	 * the original event.
3600b7579f77SDag-Erling Smørgrav 	 * NOTE: we could only look for the AnswerRRset if the
3601b7579f77SDag-Erling Smørgrav 	 * response type was ANSWER. */
3602b7579f77SDag-Erling Smørgrav 	rrset = reply_find_answer_rrset(&iq->qchase, qstate->return_msg->rep);
3603b7579f77SDag-Erling Smørgrav 	if(rrset) {
3604091e9e46SCy Schubert 		int additions = 0;
3605b7579f77SDag-Erling Smørgrav 		/* if CNAMEs have been followed - add new NS to delegpt. */
3606b7579f77SDag-Erling Smørgrav 		/* BTW. RFC 1918 says NS should not have got CNAMEs. Robust. */
3607b7579f77SDag-Erling Smørgrav 		if(!delegpt_find_ns(foriq->dp, rrset->rk.dname,
3608b7579f77SDag-Erling Smørgrav 			rrset->rk.dname_len)) {
3609b7579f77SDag-Erling Smørgrav 			/* if dpns->lame then set newcname ns lame too */
3610b7579f77SDag-Erling Smørgrav 			if(!delegpt_add_ns(foriq->dp, forq->region,
36119cf5bc93SCy Schubert 				rrset->rk.dname, dpns->lame, dpns->tls_auth_name,
36129cf5bc93SCy Schubert 				dpns->port))
3613b7579f77SDag-Erling Smørgrav 				log_err("out of memory adding cnamed-ns");
3614b7579f77SDag-Erling Smørgrav 		}
3615b7579f77SDag-Erling Smørgrav 		/* if dpns->lame then set the address(es) lame too */
3616b7579f77SDag-Erling Smørgrav 		if(!delegpt_add_rrset(foriq->dp, forq->region, rrset,
3617091e9e46SCy Schubert 			dpns->lame, &additions))
3618b7579f77SDag-Erling Smørgrav 			log_err("out of memory adding targets");
3619091e9e46SCy Schubert 		if(!additions) {
3620091e9e46SCy Schubert 			/* no new addresses, increase the nxns counter, like
3621091e9e46SCy Schubert 			 * this could be a list of wildcards with no new
3622091e9e46SCy Schubert 			 * addresses */
3623091e9e46SCy Schubert 			target_count_increase_nx(foriq, 1);
3624091e9e46SCy Schubert 		}
3625b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "added target response");
3626b7579f77SDag-Erling Smørgrav 		delegpt_log(VERB_ALGO, foriq->dp);
3627b7579f77SDag-Erling Smørgrav 	} else {
3628b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "iterator TargetResponse failed");
3629091e9e46SCy Schubert 		delegpt_mark_neg(dpns, qstate->qinfo.qtype);
3630*8f76bb7dSCy Schubert 		if((dpns->got4 == 2 || (!ie->supports_ipv4 && !ie->use_nat64)) &&
3631865f46b2SCy Schubert 			(dpns->got6 == 2 || !ie->supports_ipv6)) {
3632865f46b2SCy Schubert 			dpns->resolved = 1; /* fail the target */
36330a92a9fcSCy Schubert 			/* do not count cached answers */
3634865f46b2SCy Schubert 			if(qstate->reply_origin && qstate->reply_origin->len != 0) {
3635091e9e46SCy Schubert 				target_count_increase_nx(foriq, 1);
3636b7579f77SDag-Erling Smørgrav 			}
3637b7579f77SDag-Erling Smørgrav 		}
36380a92a9fcSCy Schubert 	}
3639865f46b2SCy Schubert }
3640b7579f77SDag-Erling Smørgrav 
3641b7579f77SDag-Erling Smørgrav /**
3642b7579f77SDag-Erling Smørgrav  * Process response for DS NS Find queries, that attempt to find the delegation
3643b7579f77SDag-Erling Smørgrav  * point where we ask the DS query from.
3644b7579f77SDag-Erling Smørgrav  *
3645b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3646b7579f77SDag-Erling Smørgrav  * @param id: module id.
3647b7579f77SDag-Erling Smørgrav  * @param forq: super query state.
3648b7579f77SDag-Erling Smørgrav  */
3649b7579f77SDag-Erling Smørgrav static void
3650b7579f77SDag-Erling Smørgrav processDSNSResponse(struct module_qstate* qstate, int id,
3651b7579f77SDag-Erling Smørgrav 	struct module_qstate* forq)
3652b7579f77SDag-Erling Smørgrav {
3653b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
3654b7579f77SDag-Erling Smørgrav 
3655b7579f77SDag-Erling Smørgrav 	/* if the finished (iq->response) query has no NS set: continue
3656b7579f77SDag-Erling Smørgrav 	 * up to look for the right dp; nothing to change, do DPNSstate */
3657b7579f77SDag-Erling Smørgrav 	if(qstate->return_rcode != LDNS_RCODE_NOERROR)
3658b7579f77SDag-Erling Smørgrav 		return; /* seek further */
3659b7579f77SDag-Erling Smørgrav 	/* find the NS RRset (without allowing CNAMEs) */
3660b7579f77SDag-Erling Smørgrav 	if(!reply_find_rrset(qstate->return_msg->rep, qstate->qinfo.qname,
3661b7579f77SDag-Erling Smørgrav 		qstate->qinfo.qname_len, LDNS_RR_TYPE_NS,
3662b7579f77SDag-Erling Smørgrav 		qstate->qinfo.qclass)){
3663b7579f77SDag-Erling Smørgrav 		return; /* seek further */
3664b7579f77SDag-Erling Smørgrav 	}
3665b7579f77SDag-Erling Smørgrav 
3666b7579f77SDag-Erling Smørgrav 	/* else, store as DP and continue at querytargets */
3667b7579f77SDag-Erling Smørgrav 	foriq->state = QUERYTARGETS_STATE;
3668b7579f77SDag-Erling Smørgrav 	foriq->dp = delegpt_from_message(qstate->return_msg, forq->region);
3669b7579f77SDag-Erling Smørgrav 	if(!foriq->dp) {
3670b7579f77SDag-Erling Smørgrav 		log_err("out of memory in dsns dp alloc");
36714c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "malloc failure, in DS search");
3672b7579f77SDag-Erling Smørgrav 		return; /* dp==NULL in QUERYTARGETS makes SERVFAIL */
3673b7579f77SDag-Erling Smørgrav 	}
3674b7579f77SDag-Erling Smørgrav 	/* success, go query the querytargets in the new dp (and go down) */
3675b7579f77SDag-Erling Smørgrav }
3676b7579f77SDag-Erling Smørgrav 
3677b7579f77SDag-Erling Smørgrav /**
3678b7579f77SDag-Erling Smørgrav  * Process response for qclass=ANY queries for a particular class.
3679b7579f77SDag-Erling Smørgrav  * Append to result or error-exit.
3680b7579f77SDag-Erling Smørgrav  *
3681b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3682b7579f77SDag-Erling Smørgrav  * @param id: module id.
3683b7579f77SDag-Erling Smørgrav  * @param forq: super query state.
3684b7579f77SDag-Erling Smørgrav  */
3685b7579f77SDag-Erling Smørgrav static void
3686b7579f77SDag-Erling Smørgrav processClassResponse(struct module_qstate* qstate, int id,
3687b7579f77SDag-Erling Smørgrav 	struct module_qstate* forq)
3688b7579f77SDag-Erling Smørgrav {
3689b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
3690b7579f77SDag-Erling Smørgrav 	struct dns_msg* from = qstate->return_msg;
3691b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processClassResponse", &qstate->qinfo);
3692b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processClassResponse super", &forq->qinfo);
3693b7579f77SDag-Erling Smørgrav 	if(qstate->return_rcode != LDNS_RCODE_NOERROR) {
3694b7579f77SDag-Erling Smørgrav 		/* cause servfail for qclass ANY query */
3695b7579f77SDag-Erling Smørgrav 		foriq->response = NULL;
3696b7579f77SDag-Erling Smørgrav 		foriq->state = FINISHED_STATE;
3697b7579f77SDag-Erling Smørgrav 		return;
3698b7579f77SDag-Erling Smørgrav 	}
3699b7579f77SDag-Erling Smørgrav 	/* append result */
3700b7579f77SDag-Erling Smørgrav 	if(!foriq->response) {
3701b7579f77SDag-Erling Smørgrav 		/* allocate the response: copy RCODE, sec_state */
3702b7579f77SDag-Erling Smørgrav 		foriq->response = dns_copy_msg(from, forq->region);
3703b7579f77SDag-Erling Smørgrav 		if(!foriq->response) {
3704b7579f77SDag-Erling Smørgrav 			log_err("malloc failed for qclass ANY response");
3705b7579f77SDag-Erling Smørgrav 			foriq->state = FINISHED_STATE;
3706b7579f77SDag-Erling Smørgrav 			return;
3707b7579f77SDag-Erling Smørgrav 		}
3708b7579f77SDag-Erling Smørgrav 		foriq->response->qinfo.qclass = forq->qinfo.qclass;
3709b7579f77SDag-Erling Smørgrav 		/* qclass ANY does not receive the AA flag on replies */
3710b7579f77SDag-Erling Smørgrav 		foriq->response->rep->authoritative = 0;
3711b7579f77SDag-Erling Smørgrav 	} else {
3712b7579f77SDag-Erling Smørgrav 		struct dns_msg* to = foriq->response;
3713b7579f77SDag-Erling Smørgrav 		/* add _from_ this response _to_ existing collection */
3714b7579f77SDag-Erling Smørgrav 		/* if there are records, copy RCODE */
3715b7579f77SDag-Erling Smørgrav 		/* lower sec_state if this message is lower */
3716b7579f77SDag-Erling Smørgrav 		if(from->rep->rrset_count != 0) {
3717b7579f77SDag-Erling Smørgrav 			size_t n = from->rep->rrset_count+to->rep->rrset_count;
3718b7579f77SDag-Erling Smørgrav 			struct ub_packed_rrset_key** dest, **d;
3719b7579f77SDag-Erling Smørgrav 			/* copy appropriate rcode */
3720b7579f77SDag-Erling Smørgrav 			to->rep->flags = from->rep->flags;
3721b7579f77SDag-Erling Smørgrav 			/* copy rrsets */
372209a3aaf3SDag-Erling Smørgrav 			if(from->rep->rrset_count > RR_COUNT_MAX ||
372309a3aaf3SDag-Erling Smørgrav 				to->rep->rrset_count > RR_COUNT_MAX) {
372409a3aaf3SDag-Erling Smørgrav 				log_err("malloc failed (too many rrsets) in collect ANY");
372509a3aaf3SDag-Erling Smørgrav 				foriq->state = FINISHED_STATE;
372609a3aaf3SDag-Erling Smørgrav 				return; /* integer overflow protection */
372709a3aaf3SDag-Erling Smørgrav 			}
3728b7579f77SDag-Erling Smørgrav 			dest = regional_alloc(forq->region, sizeof(dest[0])*n);
3729b7579f77SDag-Erling Smørgrav 			if(!dest) {
3730b7579f77SDag-Erling Smørgrav 				log_err("malloc failed in collect ANY");
3731b7579f77SDag-Erling Smørgrav 				foriq->state = FINISHED_STATE;
3732b7579f77SDag-Erling Smørgrav 				return;
3733b7579f77SDag-Erling Smørgrav 			}
3734b7579f77SDag-Erling Smørgrav 			d = dest;
3735b7579f77SDag-Erling Smørgrav 			/* copy AN */
3736b7579f77SDag-Erling Smørgrav 			memcpy(dest, to->rep->rrsets, to->rep->an_numrrsets
3737b7579f77SDag-Erling Smørgrav 				* sizeof(dest[0]));
3738b7579f77SDag-Erling Smørgrav 			dest += to->rep->an_numrrsets;
3739b7579f77SDag-Erling Smørgrav 			memcpy(dest, from->rep->rrsets, from->rep->an_numrrsets
3740b7579f77SDag-Erling Smørgrav 				* sizeof(dest[0]));
3741b7579f77SDag-Erling Smørgrav 			dest += from->rep->an_numrrsets;
3742b7579f77SDag-Erling Smørgrav 			/* copy NS */
3743b7579f77SDag-Erling Smørgrav 			memcpy(dest, to->rep->rrsets+to->rep->an_numrrsets,
3744b7579f77SDag-Erling Smørgrav 				to->rep->ns_numrrsets * sizeof(dest[0]));
3745b7579f77SDag-Erling Smørgrav 			dest += to->rep->ns_numrrsets;
3746b7579f77SDag-Erling Smørgrav 			memcpy(dest, from->rep->rrsets+from->rep->an_numrrsets,
3747b7579f77SDag-Erling Smørgrav 				from->rep->ns_numrrsets * sizeof(dest[0]));
3748b7579f77SDag-Erling Smørgrav 			dest += from->rep->ns_numrrsets;
3749b7579f77SDag-Erling Smørgrav 			/* copy AR */
3750b7579f77SDag-Erling Smørgrav 			memcpy(dest, to->rep->rrsets+to->rep->an_numrrsets+
3751b7579f77SDag-Erling Smørgrav 				to->rep->ns_numrrsets,
3752b7579f77SDag-Erling Smørgrav 				to->rep->ar_numrrsets * sizeof(dest[0]));
3753b7579f77SDag-Erling Smørgrav 			dest += to->rep->ar_numrrsets;
3754b7579f77SDag-Erling Smørgrav 			memcpy(dest, from->rep->rrsets+from->rep->an_numrrsets+
3755b7579f77SDag-Erling Smørgrav 				from->rep->ns_numrrsets,
3756b7579f77SDag-Erling Smørgrav 				from->rep->ar_numrrsets * sizeof(dest[0]));
3757b7579f77SDag-Erling Smørgrav 			/* update counts */
3758b7579f77SDag-Erling Smørgrav 			to->rep->rrsets = d;
3759b7579f77SDag-Erling Smørgrav 			to->rep->an_numrrsets += from->rep->an_numrrsets;
3760b7579f77SDag-Erling Smørgrav 			to->rep->ns_numrrsets += from->rep->ns_numrrsets;
3761b7579f77SDag-Erling Smørgrav 			to->rep->ar_numrrsets += from->rep->ar_numrrsets;
3762b7579f77SDag-Erling Smørgrav 			to->rep->rrset_count = n;
3763b7579f77SDag-Erling Smørgrav 		}
3764b7579f77SDag-Erling Smørgrav 		if(from->rep->security < to->rep->security) /* lowest sec */
3765b7579f77SDag-Erling Smørgrav 			to->rep->security = from->rep->security;
3766b7579f77SDag-Erling Smørgrav 		if(from->rep->qdcount != 0) /* insert qd if appropriate */
3767b7579f77SDag-Erling Smørgrav 			to->rep->qdcount = from->rep->qdcount;
3768b7579f77SDag-Erling Smørgrav 		if(from->rep->ttl < to->rep->ttl) /* use smallest TTL */
3769b7579f77SDag-Erling Smørgrav 			to->rep->ttl = from->rep->ttl;
3770b7579f77SDag-Erling Smørgrav 		if(from->rep->prefetch_ttl < to->rep->prefetch_ttl)
3771b7579f77SDag-Erling Smørgrav 			to->rep->prefetch_ttl = from->rep->prefetch_ttl;
37724c75e3aaSDag-Erling Smørgrav 		if(from->rep->serve_expired_ttl < to->rep->serve_expired_ttl)
37734c75e3aaSDag-Erling Smørgrav 			to->rep->serve_expired_ttl = from->rep->serve_expired_ttl;
3774b7579f77SDag-Erling Smørgrav 	}
3775b7579f77SDag-Erling Smørgrav 	/* are we done? */
3776b7579f77SDag-Erling Smørgrav 	foriq->num_current_queries --;
3777b7579f77SDag-Erling Smørgrav 	if(foriq->num_current_queries == 0)
3778b7579f77SDag-Erling Smørgrav 		foriq->state = FINISHED_STATE;
3779b7579f77SDag-Erling Smørgrav }
3780b7579f77SDag-Erling Smørgrav 
3781b7579f77SDag-Erling Smørgrav /**
3782b7579f77SDag-Erling Smørgrav  * Collect class ANY responses and make them into one response.  This
3783b7579f77SDag-Erling Smørgrav  * state is started and it creates queries for all classes (that have
3784b7579f77SDag-Erling Smørgrav  * root hints).  The answers are then collected.
3785b7579f77SDag-Erling Smørgrav  *
3786b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3787b7579f77SDag-Erling Smørgrav  * @param id: module id.
3788b7579f77SDag-Erling Smørgrav  * @return true if the event needs more immediate processing, false if not.
3789b7579f77SDag-Erling Smørgrav  */
3790b7579f77SDag-Erling Smørgrav static int
3791b7579f77SDag-Erling Smørgrav processCollectClass(struct module_qstate* qstate, int id)
3792b7579f77SDag-Erling Smørgrav {
3793b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
3794b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
3795b7579f77SDag-Erling Smørgrav 	/* If qchase.qclass == 0 then send out queries for all classes.
3796b7579f77SDag-Erling Smørgrav 	 * Otherwise, do nothing (wait for all answers to arrive and the
3797b7579f77SDag-Erling Smørgrav 	 * processClassResponse to put them together, and that moves us
3798b7579f77SDag-Erling Smørgrav 	 * towards the Finished state when done. */
3799b7579f77SDag-Erling Smørgrav 	if(iq->qchase.qclass == 0) {
3800b7579f77SDag-Erling Smørgrav 		uint16_t c = 0;
3801b7579f77SDag-Erling Smørgrav 		iq->qchase.qclass = LDNS_RR_CLASS_ANY;
3802b7579f77SDag-Erling Smørgrav 		while(iter_get_next_root(qstate->env->hints,
3803b7579f77SDag-Erling Smørgrav 			qstate->env->fwds, &c)) {
3804b7579f77SDag-Erling Smørgrav 			/* generate query for this class */
3805b7579f77SDag-Erling Smørgrav 			log_nametypeclass(VERB_ALGO, "spawn collect query",
3806b7579f77SDag-Erling Smørgrav 				qstate->qinfo.qname, qstate->qinfo.qtype, c);
3807b7579f77SDag-Erling Smørgrav 			if(!generate_sub_request(qstate->qinfo.qname,
3808b7579f77SDag-Erling Smørgrav 				qstate->qinfo.qname_len, qstate->qinfo.qtype,
3809b7579f77SDag-Erling Smørgrav 				c, qstate, id, iq, INIT_REQUEST_STATE,
3810b7579f77SDag-Erling Smørgrav 				FINISHED_STATE, &subq,
3811091e9e46SCy Schubert 				(int)!(qstate->query_flags&BIT_CD), 0)) {
38124c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "could not generate class ANY"
38134c75e3aaSDag-Erling Smørgrav 					" lookup query");
3814b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
3815b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
3816b7579f77SDag-Erling Smørgrav 			}
3817b7579f77SDag-Erling Smørgrav 			/* ignore subq, no special init required */
3818b7579f77SDag-Erling Smørgrav 			iq->num_current_queries ++;
3819b7579f77SDag-Erling Smørgrav 			if(c == 0xffff)
3820b7579f77SDag-Erling Smørgrav 				break;
3821b7579f77SDag-Erling Smørgrav 			else c++;
3822b7579f77SDag-Erling Smørgrav 		}
3823b7579f77SDag-Erling Smørgrav 		/* if no roots are configured at all, return */
3824b7579f77SDag-Erling Smørgrav 		if(iq->num_current_queries == 0) {
3825b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "No root hints or fwds, giving up "
3826b7579f77SDag-Erling Smørgrav 				"on qclass ANY");
3827b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_REFUSED);
3828b7579f77SDag-Erling Smørgrav 		}
3829b7579f77SDag-Erling Smørgrav 		/* return false, wait for queries to return */
3830b7579f77SDag-Erling Smørgrav 	}
3831b7579f77SDag-Erling Smørgrav 	/* if woke up here because of an answer, wait for more answers */
3832b7579f77SDag-Erling Smørgrav 	return 0;
3833b7579f77SDag-Erling Smørgrav }
3834b7579f77SDag-Erling Smørgrav 
3835b7579f77SDag-Erling Smørgrav /**
3836b7579f77SDag-Erling Smørgrav  * This handles the final state for first-tier responses (i.e., responses to
3837b7579f77SDag-Erling Smørgrav  * externally generated queries).
3838b7579f77SDag-Erling Smørgrav  *
3839b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3840b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
3841b7579f77SDag-Erling Smørgrav  * @param id: module id.
3842b7579f77SDag-Erling Smørgrav  * @return true if the event needs more processing, false if not. Since this
3843b7579f77SDag-Erling Smørgrav  *         is the final state for an event, it always returns false.
3844b7579f77SDag-Erling Smørgrav  */
3845b7579f77SDag-Erling Smørgrav static int
3846b7579f77SDag-Erling Smørgrav processFinished(struct module_qstate* qstate, struct iter_qstate* iq,
3847b7579f77SDag-Erling Smørgrav 	int id)
3848b7579f77SDag-Erling Smørgrav {
3849b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "finishing processing for",
3850b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
3851b7579f77SDag-Erling Smørgrav 
3852b7579f77SDag-Erling Smørgrav 	/* store negative cache element for parent side glue. */
3853bc892140SDag-Erling Smørgrav 	if(!qstate->no_cache_store && iq->query_for_pside_glue
3854bc892140SDag-Erling Smørgrav 		&& !iq->pside_glue)
3855b7579f77SDag-Erling Smørgrav 			iter_store_parentside_neg(qstate->env, &qstate->qinfo,
3856b7579f77SDag-Erling Smørgrav 				iq->deleg_msg?iq->deleg_msg->rep:
3857b7579f77SDag-Erling Smørgrav 				(iq->response?iq->response->rep:NULL));
3858b7579f77SDag-Erling Smørgrav 	if(!iq->response) {
3859b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "No response is set, servfail");
38604c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "(no response found at query finish)");
3861b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3862b7579f77SDag-Erling Smørgrav 	}
3863b7579f77SDag-Erling Smørgrav 
3864b7579f77SDag-Erling Smørgrav 	/* Make sure that the RA flag is set (since the presence of
3865b7579f77SDag-Erling Smørgrav 	 * this module means that recursion is available) */
3866b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags |= BIT_RA;
3867b7579f77SDag-Erling Smørgrav 
3868b7579f77SDag-Erling Smørgrav 	/* Clear the AA flag */
3869b7579f77SDag-Erling Smørgrav 	/* FIXME: does this action go here or in some other module? */
3870b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags &= ~BIT_AA;
3871b7579f77SDag-Erling Smørgrav 
3872b7579f77SDag-Erling Smørgrav 	/* make sure QR flag is on */
3873b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags |= BIT_QR;
3874b7579f77SDag-Erling Smørgrav 
3875*8f76bb7dSCy Schubert 	/* explicitly set the EDE string to NULL */
3876*8f76bb7dSCy Schubert 	iq->response->rep->reason_bogus_str = NULL;
3877*8f76bb7dSCy Schubert 
3878b7579f77SDag-Erling Smørgrav 	/* we have finished processing this query */
3879b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_finished;
3880b7579f77SDag-Erling Smørgrav 
3881b7579f77SDag-Erling Smørgrav 	/* TODO:  we are using a private TTL, trim the response. */
3882b7579f77SDag-Erling Smørgrav 	/* if (mPrivateTTL > 0){IterUtils.setPrivateTTL(resp, mPrivateTTL); } */
3883b7579f77SDag-Erling Smørgrav 
3884b7579f77SDag-Erling Smørgrav 	/* prepend any items we have accumulated */
3885b7579f77SDag-Erling Smørgrav 	if(iq->an_prepend_list || iq->ns_prepend_list) {
3886b7579f77SDag-Erling Smørgrav 		if(!iter_prepend(iq, iq->response, qstate->region)) {
3887b7579f77SDag-Erling Smørgrav 			log_err("prepend rrsets: out of memory");
3888b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3889b7579f77SDag-Erling Smørgrav 		}
3890b7579f77SDag-Erling Smørgrav 		/* reset the query name back */
3891b7579f77SDag-Erling Smørgrav 		iq->response->qinfo = qstate->qinfo;
3892b7579f77SDag-Erling Smørgrav 		/* the security state depends on the combination */
3893b7579f77SDag-Erling Smørgrav 		iq->response->rep->security = sec_status_unchecked;
3894b7579f77SDag-Erling Smørgrav 		/* store message with the finished prepended items,
3895b7579f77SDag-Erling Smørgrav 		 * but only if we did recursion. The nonrecursion referral
3896b7579f77SDag-Erling Smørgrav 		 * from cache does not need to be stored in the msg cache. */
3897bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store && qstate->query_flags&BIT_RD) {
38988ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &qstate->qinfo,
3899b7579f77SDag-Erling Smørgrav 				iq->response->rep, 0, qstate->prefetch_leeway,
3900b7579f77SDag-Erling Smørgrav 				iq->dp&&iq->dp->has_parent_side_NS,
3901790c6b24SCy Schubert 				qstate->region, qstate->query_flags,
3902790c6b24SCy Schubert 				qstate->qstarttime);
3903b7579f77SDag-Erling Smørgrav 		}
3904b7579f77SDag-Erling Smørgrav 	}
3905b7579f77SDag-Erling Smørgrav 	qstate->return_rcode = LDNS_RCODE_NOERROR;
3906b7579f77SDag-Erling Smørgrav 	qstate->return_msg = iq->response;
3907b7579f77SDag-Erling Smørgrav 	return 0;
3908b7579f77SDag-Erling Smørgrav }
3909b7579f77SDag-Erling Smørgrav 
3910b7579f77SDag-Erling Smørgrav /*
39118a384985SDag-Erling Smørgrav  * Return priming query results to interested super querystates.
3912b7579f77SDag-Erling Smørgrav  *
3913b7579f77SDag-Erling Smørgrav  * Sets the delegation point and delegation message (not nonRD queries).
3914b7579f77SDag-Erling Smørgrav  * This is a callback from walk_supers.
3915b7579f77SDag-Erling Smørgrav  *
3916b7579f77SDag-Erling Smørgrav  * @param qstate: query state that finished.
3917b7579f77SDag-Erling Smørgrav  * @param id: module id.
3918b7579f77SDag-Erling Smørgrav  * @param super: the qstate to inform.
3919b7579f77SDag-Erling Smørgrav  */
3920b7579f77SDag-Erling Smørgrav void
3921b7579f77SDag-Erling Smørgrav iter_inform_super(struct module_qstate* qstate, int id,
3922b7579f77SDag-Erling Smørgrav 	struct module_qstate* super)
3923b7579f77SDag-Erling Smørgrav {
3924b7579f77SDag-Erling Smørgrav 	if(!qstate->is_priming && super->qinfo.qclass == LDNS_RR_CLASS_ANY)
3925b7579f77SDag-Erling Smørgrav 		processClassResponse(qstate, id, super);
3926b7579f77SDag-Erling Smørgrav 	else if(super->qinfo.qtype == LDNS_RR_TYPE_DS && ((struct iter_qstate*)
3927b7579f77SDag-Erling Smørgrav 		super->minfo[id])->state == DSNS_FIND_STATE)
3928b7579f77SDag-Erling Smørgrav 		processDSNSResponse(qstate, id, super);
3929b7579f77SDag-Erling Smørgrav 	else if(qstate->return_rcode != LDNS_RCODE_NOERROR)
3930b7579f77SDag-Erling Smørgrav 		error_supers(qstate, id, super);
3931b7579f77SDag-Erling Smørgrav 	else if(qstate->is_priming)
3932b7579f77SDag-Erling Smørgrav 		prime_supers(qstate, id, super);
3933b7579f77SDag-Erling Smørgrav 	else	processTargetResponse(qstate, id, super);
3934b7579f77SDag-Erling Smørgrav }
3935b7579f77SDag-Erling Smørgrav 
3936b7579f77SDag-Erling Smørgrav /**
3937b7579f77SDag-Erling Smørgrav  * Handle iterator state.
3938b7579f77SDag-Erling Smørgrav  * Handle events. This is the real processing loop for events, responsible
3939b7579f77SDag-Erling Smørgrav  * for moving events through the various states. If a processing method
3940b7579f77SDag-Erling Smørgrav  * returns true, then it will be advanced to the next state. If false, then
3941b7579f77SDag-Erling Smørgrav  * processing will stop.
3942b7579f77SDag-Erling Smørgrav  *
3943b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3944b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
3945b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
3946b7579f77SDag-Erling Smørgrav  * @param id: module id.
3947b7579f77SDag-Erling Smørgrav  */
3948b7579f77SDag-Erling Smørgrav static void
3949b7579f77SDag-Erling Smørgrav iter_handle(struct module_qstate* qstate, struct iter_qstate* iq,
3950b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
3951b7579f77SDag-Erling Smørgrav {
3952b7579f77SDag-Erling Smørgrav 	int cont = 1;
3953b7579f77SDag-Erling Smørgrav 	while(cont) {
3954b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "iter_handle processing q with state %s",
3955b7579f77SDag-Erling Smørgrav 			iter_state_to_string(iq->state));
3956b7579f77SDag-Erling Smørgrav 		switch(iq->state) {
3957b7579f77SDag-Erling Smørgrav 			case INIT_REQUEST_STATE:
3958b7579f77SDag-Erling Smørgrav 				cont = processInitRequest(qstate, iq, ie, id);
3959b7579f77SDag-Erling Smørgrav 				break;
3960b7579f77SDag-Erling Smørgrav 			case INIT_REQUEST_2_STATE:
3961b7579f77SDag-Erling Smørgrav 				cont = processInitRequest2(qstate, iq, id);
3962b7579f77SDag-Erling Smørgrav 				break;
3963b7579f77SDag-Erling Smørgrav 			case INIT_REQUEST_3_STATE:
3964b7579f77SDag-Erling Smørgrav 				cont = processInitRequest3(qstate, iq, id);
3965b7579f77SDag-Erling Smørgrav 				break;
3966b7579f77SDag-Erling Smørgrav 			case QUERYTARGETS_STATE:
3967b7579f77SDag-Erling Smørgrav 				cont = processQueryTargets(qstate, iq, ie, id);
3968b7579f77SDag-Erling Smørgrav 				break;
3969b7579f77SDag-Erling Smørgrav 			case QUERY_RESP_STATE:
397024e36522SCy Schubert 				cont = processQueryResponse(qstate, iq, ie, id);
3971b7579f77SDag-Erling Smørgrav 				break;
3972b7579f77SDag-Erling Smørgrav 			case PRIME_RESP_STATE:
3973b7579f77SDag-Erling Smørgrav 				cont = processPrimeResponse(qstate, id);
3974b7579f77SDag-Erling Smørgrav 				break;
3975b7579f77SDag-Erling Smørgrav 			case COLLECT_CLASS_STATE:
3976b7579f77SDag-Erling Smørgrav 				cont = processCollectClass(qstate, id);
3977b7579f77SDag-Erling Smørgrav 				break;
3978b7579f77SDag-Erling Smørgrav 			case DSNS_FIND_STATE:
3979b7579f77SDag-Erling Smørgrav 				cont = processDSNSFind(qstate, iq, id);
3980b7579f77SDag-Erling Smørgrav 				break;
3981b7579f77SDag-Erling Smørgrav 			case FINISHED_STATE:
3982b7579f77SDag-Erling Smørgrav 				cont = processFinished(qstate, iq, id);
3983b7579f77SDag-Erling Smørgrav 				break;
3984b7579f77SDag-Erling Smørgrav 			default:
3985b7579f77SDag-Erling Smørgrav 				log_warn("iterator: invalid state: %d",
3986b7579f77SDag-Erling Smørgrav 					iq->state);
3987b7579f77SDag-Erling Smørgrav 				cont = 0;
3988b7579f77SDag-Erling Smørgrav 				break;
3989b7579f77SDag-Erling Smørgrav 		}
3990b7579f77SDag-Erling Smørgrav 	}
3991b7579f77SDag-Erling Smørgrav }
3992b7579f77SDag-Erling Smørgrav 
3993b7579f77SDag-Erling Smørgrav /**
3994b7579f77SDag-Erling Smørgrav  * This is the primary entry point for processing request events. Note that
3995b7579f77SDag-Erling Smørgrav  * this method should only be used by external modules.
3996b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3997b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
3998b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
3999b7579f77SDag-Erling Smørgrav  * @param id: module id.
4000b7579f77SDag-Erling Smørgrav  */
4001b7579f77SDag-Erling Smørgrav static void
4002b7579f77SDag-Erling Smørgrav process_request(struct module_qstate* qstate, struct iter_qstate* iq,
4003b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
4004b7579f77SDag-Erling Smørgrav {
4005b7579f77SDag-Erling Smørgrav 	/* external requests start in the INIT state, and finish using the
4006b7579f77SDag-Erling Smørgrav 	 * FINISHED state. */
4007b7579f77SDag-Erling Smørgrav 	iq->state = INIT_REQUEST_STATE;
4008b7579f77SDag-Erling Smørgrav 	iq->final_state = FINISHED_STATE;
4009b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "process_request: new external request event");
4010b7579f77SDag-Erling Smørgrav 	iter_handle(qstate, iq, ie, id);
4011b7579f77SDag-Erling Smørgrav }
4012b7579f77SDag-Erling Smørgrav 
4013b7579f77SDag-Erling Smørgrav /** process authoritative server reply */
4014b7579f77SDag-Erling Smørgrav static void
4015b7579f77SDag-Erling Smørgrav process_response(struct module_qstate* qstate, struct iter_qstate* iq,
4016b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id, struct outbound_entry* outbound,
4017b7579f77SDag-Erling Smørgrav 	enum module_ev event)
4018b7579f77SDag-Erling Smørgrav {
4019b7579f77SDag-Erling Smørgrav 	struct msg_parse* prs;
4020b7579f77SDag-Erling Smørgrav 	struct edns_data edns;
402117d15b25SDag-Erling Smørgrav 	sldns_buffer* pkt;
4022b7579f77SDag-Erling Smørgrav 
4023b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "process_response: new external response event");
4024b7579f77SDag-Erling Smørgrav 	iq->response = NULL;
4025b7579f77SDag-Erling Smørgrav 	iq->state = QUERY_RESP_STATE;
4026b7579f77SDag-Erling Smørgrav 	if(event == module_event_noreply || event == module_event_error) {
402725039b37SCy Schubert 		if(event == module_event_noreply && iq->timeout_count >= 3 &&
4028ff825849SDag-Erling Smørgrav 			qstate->env->cfg->use_caps_bits_for_id &&
4029e86b9096SDag-Erling Smørgrav 			!iq->caps_fallback && !is_caps_whitelisted(ie, iq)) {
4030ff825849SDag-Erling Smørgrav 			/* start fallback */
4031ff825849SDag-Erling Smørgrav 			iq->caps_fallback = 1;
4032ff825849SDag-Erling Smørgrav 			iq->caps_server = 0;
4033ff825849SDag-Erling Smørgrav 			iq->caps_reply = NULL;
403409a3aaf3SDag-Erling Smørgrav 			iq->caps_response = NULL;
40354c75e3aaSDag-Erling Smørgrav 			iq->caps_minimisation_state = DONOT_MINIMISE_STATE;
4036ff825849SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
4037ff825849SDag-Erling Smørgrav 			iq->num_current_queries--;
4038ff825849SDag-Erling Smørgrav 			/* need fresh attempts for the 0x20 fallback, if
4039ff825849SDag-Erling Smørgrav 			 * that was the cause for the failure */
404024e36522SCy Schubert 			iter_dec_attempts(iq->dp, 3, ie->outbound_msg_retry);
4041ff825849SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: timeouts, starting fallback");
4042ff825849SDag-Erling Smørgrav 			goto handle_it;
4043ff825849SDag-Erling Smørgrav 		}
4044b7579f77SDag-Erling Smørgrav 		goto handle_it;
4045b7579f77SDag-Erling Smørgrav 	}
4046b7579f77SDag-Erling Smørgrav 	if( (event != module_event_reply && event != module_event_capsfail)
4047b7579f77SDag-Erling Smørgrav 		|| !qstate->reply) {
4048b7579f77SDag-Erling Smørgrav 		log_err("Bad event combined with response");
4049b7579f77SDag-Erling Smørgrav 		outbound_list_remove(&iq->outlist, outbound);
40504c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "module iterator received wrong internal event with a response message");
4051b7579f77SDag-Erling Smørgrav 		(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
4052b7579f77SDag-Erling Smørgrav 		return;
4053b7579f77SDag-Erling Smørgrav 	}
4054b7579f77SDag-Erling Smørgrav 
4055b7579f77SDag-Erling Smørgrav 	/* parse message */
4056*8f76bb7dSCy Schubert 	fill_fail_addr(iq, &qstate->reply->remote_addr,
4057*8f76bb7dSCy Schubert 		qstate->reply->remote_addrlen);
4058b7579f77SDag-Erling Smørgrav 	prs = (struct msg_parse*)regional_alloc(qstate->env->scratch,
4059b7579f77SDag-Erling Smørgrav 		sizeof(struct msg_parse));
4060b7579f77SDag-Erling Smørgrav 	if(!prs) {
4061b7579f77SDag-Erling Smørgrav 		log_err("out of memory on incoming message");
4062b7579f77SDag-Erling Smørgrav 		/* like packet got dropped */
4063b7579f77SDag-Erling Smørgrav 		goto handle_it;
4064b7579f77SDag-Erling Smørgrav 	}
4065b7579f77SDag-Erling Smørgrav 	memset(prs, 0, sizeof(*prs));
4066b7579f77SDag-Erling Smørgrav 	memset(&edns, 0, sizeof(edns));
4067b7579f77SDag-Erling Smørgrav 	pkt = qstate->reply->c->buffer;
406817d15b25SDag-Erling Smørgrav 	sldns_buffer_set_position(pkt, 0);
4069b7579f77SDag-Erling Smørgrav 	if(parse_packet(pkt, prs, qstate->env->scratch) != LDNS_RCODE_NOERROR) {
4070b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "parse error on reply packet");
40715469a995SCy Schubert 		iq->parse_failures++;
4072b7579f77SDag-Erling Smørgrav 		goto handle_it;
4073b7579f77SDag-Erling Smørgrav 	}
4074b7579f77SDag-Erling Smørgrav 	/* edns is not examined, but removed from message to help cache */
407524e36522SCy Schubert 	if(parse_extract_edns_from_response_msg(prs, &edns, qstate->env->scratch) !=
40765469a995SCy Schubert 		LDNS_RCODE_NOERROR) {
40775469a995SCy Schubert 		iq->parse_failures++;
4078b7579f77SDag-Erling Smørgrav 		goto handle_it;
40795469a995SCy Schubert 	}
4080bc892140SDag-Erling Smørgrav 
4081bc892140SDag-Erling Smørgrav 	/* Copy the edns options we may got from the back end */
408224e36522SCy Schubert 	if(edns.opt_list_in) {
408324e36522SCy Schubert 		qstate->edns_opts_back_in = edns_opt_copy_region(edns.opt_list_in,
4084bc892140SDag-Erling Smørgrav 			qstate->region);
4085bc892140SDag-Erling Smørgrav 		if(!qstate->edns_opts_back_in) {
4086bc892140SDag-Erling Smørgrav 			log_err("out of memory on incoming message");
4087bc892140SDag-Erling Smørgrav 			/* like packet got dropped */
4088bc892140SDag-Erling Smørgrav 			goto handle_it;
4089bc892140SDag-Erling Smørgrav 		}
409065b390aaSDag-Erling Smørgrav 		if(!inplace_cb_edns_back_parsed_call(qstate->env, qstate)) {
409165b390aaSDag-Erling Smørgrav 			log_err("unable to call edns_back_parsed callback");
409265b390aaSDag-Erling Smørgrav 			goto handle_it;
409365b390aaSDag-Erling Smørgrav 		}
4094bc892140SDag-Erling Smørgrav 	}
4095bc892140SDag-Erling Smørgrav 
4096b7579f77SDag-Erling Smørgrav 	/* remove CD-bit, we asked for in case we handle validation ourself */
4097b7579f77SDag-Erling Smørgrav 	prs->flags &= ~BIT_CD;
4098b7579f77SDag-Erling Smørgrav 
4099b7579f77SDag-Erling Smørgrav 	/* normalize and sanitize: easy to delete items from linked lists */
410005ab2901SDag-Erling Smørgrav 	if(!scrub_message(pkt, prs, &iq->qinfo_out, iq->dp->name,
410109a3aaf3SDag-Erling Smørgrav 		qstate->env->scratch, qstate->env, ie)) {
410209a3aaf3SDag-Erling Smørgrav 		/* if 0x20 enabled, start fallback, but we have no message */
410309a3aaf3SDag-Erling Smørgrav 		if(event == module_event_capsfail && !iq->caps_fallback) {
410409a3aaf3SDag-Erling Smørgrav 			iq->caps_fallback = 1;
410509a3aaf3SDag-Erling Smørgrav 			iq->caps_server = 0;
410609a3aaf3SDag-Erling Smørgrav 			iq->caps_reply = NULL;
410709a3aaf3SDag-Erling Smørgrav 			iq->caps_response = NULL;
41084c75e3aaSDag-Erling Smørgrav 			iq->caps_minimisation_state = DONOT_MINIMISE_STATE;
410909a3aaf3SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
411009a3aaf3SDag-Erling Smørgrav 			iq->num_current_queries--;
411109a3aaf3SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: scrub failed, starting fallback with no response");
411209a3aaf3SDag-Erling Smørgrav 		}
41135469a995SCy Schubert 		iq->scrub_failures++;
4114b7579f77SDag-Erling Smørgrav 		goto handle_it;
411509a3aaf3SDag-Erling Smørgrav 	}
4116b7579f77SDag-Erling Smørgrav 
4117b7579f77SDag-Erling Smørgrav 	/* allocate response dns_msg in region */
4118b7579f77SDag-Erling Smørgrav 	iq->response = dns_alloc_msg(pkt, prs, qstate->region);
4119b7579f77SDag-Erling Smørgrav 	if(!iq->response)
4120b7579f77SDag-Erling Smørgrav 		goto handle_it;
4121b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_DETAIL, "response for", &qstate->qinfo);
4122b7579f77SDag-Erling Smørgrav 	log_name_addr(VERB_DETAIL, "reply from", iq->dp->name,
4123865f46b2SCy Schubert 		&qstate->reply->remote_addr, qstate->reply->remote_addrlen);
4124b7579f77SDag-Erling Smørgrav 	if(verbosity >= VERB_ALGO)
4125b7579f77SDag-Erling Smørgrav 		log_dns_msg("incoming scrubbed packet:", &iq->response->qinfo,
4126b7579f77SDag-Erling Smørgrav 			iq->response->rep);
4127b7579f77SDag-Erling Smørgrav 
4128ff825849SDag-Erling Smørgrav 	if(event == module_event_capsfail || iq->caps_fallback) {
41294c75e3aaSDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation &&
41304c75e3aaSDag-Erling Smørgrav 			iq->minimisation_state != DONOT_MINIMISE_STATE) {
41314c75e3aaSDag-Erling Smørgrav 			/* Skip QNAME minimisation for next query, since that
41324c75e3aaSDag-Erling Smørgrav 			 * one has to match the current query. */
41334c75e3aaSDag-Erling Smørgrav 			iq->minimisation_state = SKIP_MINIMISE_STATE;
41344c75e3aaSDag-Erling Smørgrav 		}
41356480faa8SDag-Erling Smørgrav 		/* for fallback we care about main answer, not additionals */
41366480faa8SDag-Erling Smørgrav 		/* removing that makes comparison more likely to succeed */
41376480faa8SDag-Erling Smørgrav 		caps_strip_reply(iq->response->rep);
41384c75e3aaSDag-Erling Smørgrav 
41394c75e3aaSDag-Erling Smørgrav 		if(iq->caps_fallback &&
41404c75e3aaSDag-Erling Smørgrav 			iq->caps_minimisation_state != iq->minimisation_state) {
41414c75e3aaSDag-Erling Smørgrav 			/* QNAME minimisation state has changed, restart caps
41424c75e3aaSDag-Erling Smørgrav 			 * fallback. */
41434c75e3aaSDag-Erling Smørgrav 			iq->caps_fallback = 0;
41444c75e3aaSDag-Erling Smørgrav 		}
41454c75e3aaSDag-Erling Smørgrav 
4146b7579f77SDag-Erling Smørgrav 		if(!iq->caps_fallback) {
4147b7579f77SDag-Erling Smørgrav 			/* start fallback */
4148b7579f77SDag-Erling Smørgrav 			iq->caps_fallback = 1;
4149b7579f77SDag-Erling Smørgrav 			iq->caps_server = 0;
4150b7579f77SDag-Erling Smørgrav 			iq->caps_reply = iq->response->rep;
415109a3aaf3SDag-Erling Smørgrav 			iq->caps_response = iq->response;
41524c75e3aaSDag-Erling Smørgrav 			iq->caps_minimisation_state = iq->minimisation_state;
4153b7579f77SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
4154b7579f77SDag-Erling Smørgrav 			iq->num_current_queries--;
4155b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: starting fallback");
4156b7579f77SDag-Erling Smørgrav 			goto handle_it;
4157b7579f77SDag-Erling Smørgrav 		} else {
4158b7579f77SDag-Erling Smørgrav 			/* check if reply is the same, otherwise, fail */
4159ff825849SDag-Erling Smørgrav 			if(!iq->caps_reply) {
4160ff825849SDag-Erling Smørgrav 				iq->caps_reply = iq->response->rep;
416109a3aaf3SDag-Erling Smørgrav 				iq->caps_response = iq->response;
4162ff825849SDag-Erling Smørgrav 				iq->caps_server = -1; /*become zero at ++,
4163ff825849SDag-Erling Smørgrav 				so that we start the full set of trials */
416409a3aaf3SDag-Erling Smørgrav 			} else if(caps_failed_rcode(iq->caps_reply) &&
416509a3aaf3SDag-Erling Smørgrav 				!caps_failed_rcode(iq->response->rep)) {
416609a3aaf3SDag-Erling Smørgrav 				/* prefer to upgrade to non-SERVFAIL */
416709a3aaf3SDag-Erling Smørgrav 				iq->caps_reply = iq->response->rep;
416809a3aaf3SDag-Erling Smørgrav 				iq->caps_response = iq->response;
416909a3aaf3SDag-Erling Smørgrav 			} else if(!caps_failed_rcode(iq->caps_reply) &&
417009a3aaf3SDag-Erling Smørgrav 				caps_failed_rcode(iq->response->rep)) {
417109a3aaf3SDag-Erling Smørgrav 				/* if we have non-SERVFAIL as answer then
417209a3aaf3SDag-Erling Smørgrav 				 * we can ignore SERVFAILs for the equality
417309a3aaf3SDag-Erling Smørgrav 				 * comparison */
417409a3aaf3SDag-Erling Smørgrav 				/* no instructions here, skip other else */
417509a3aaf3SDag-Erling Smørgrav 			} else if(caps_failed_rcode(iq->caps_reply) &&
417609a3aaf3SDag-Erling Smørgrav 				caps_failed_rcode(iq->response->rep)) {
417709a3aaf3SDag-Erling Smørgrav 				/* failure is same as other failure in fallbk*/
417809a3aaf3SDag-Erling Smørgrav 				/* no instructions here, skip other else */
4179ff825849SDag-Erling Smørgrav 			} else if(!reply_equal(iq->response->rep, iq->caps_reply,
418017d15b25SDag-Erling Smørgrav 				qstate->env->scratch)) {
4181b7579f77SDag-Erling Smørgrav 				verbose(VERB_DETAIL, "Capsforid fallback: "
4182b7579f77SDag-Erling Smørgrav 					"getting different replies, failed");
4183b7579f77SDag-Erling Smørgrav 				outbound_list_remove(&iq->outlist, outbound);
41844c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "0x20 failed, then got different replies in fallback");
4185b7579f77SDag-Erling Smørgrav 				(void)error_response(qstate, id,
4186b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
4187b7579f77SDag-Erling Smørgrav 				return;
4188b7579f77SDag-Erling Smørgrav 			}
4189b7579f77SDag-Erling Smørgrav 			/* continue the fallback procedure at next server */
4190b7579f77SDag-Erling Smørgrav 			iq->caps_server++;
4191b7579f77SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
4192b7579f77SDag-Erling Smørgrav 			iq->num_current_queries--;
4193b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: reply is equal. "
4194b7579f77SDag-Erling Smørgrav 				"go to next fallback");
4195b7579f77SDag-Erling Smørgrav 			goto handle_it;
4196b7579f77SDag-Erling Smørgrav 		}
4197b7579f77SDag-Erling Smørgrav 	}
4198b7579f77SDag-Erling Smørgrav 	iq->caps_fallback = 0; /* if we were in fallback, 0x20 is OK now */
4199b7579f77SDag-Erling Smørgrav 
4200b7579f77SDag-Erling Smørgrav handle_it:
4201b7579f77SDag-Erling Smørgrav 	outbound_list_remove(&iq->outlist, outbound);
4202b7579f77SDag-Erling Smørgrav 	iter_handle(qstate, iq, ie, id);
4203b7579f77SDag-Erling Smørgrav }
4204b7579f77SDag-Erling Smørgrav 
4205b7579f77SDag-Erling Smørgrav void
4206b7579f77SDag-Erling Smørgrav iter_operate(struct module_qstate* qstate, enum module_ev event, int id,
4207b7579f77SDag-Erling Smørgrav 	struct outbound_entry* outbound)
4208b7579f77SDag-Erling Smørgrav {
4209b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
4210b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
4211b7579f77SDag-Erling Smørgrav 	verbose(VERB_QUERY, "iterator[module %d] operate: extstate:%s event:%s",
4212b7579f77SDag-Erling Smørgrav 		id, strextstate(qstate->ext_state[id]), strmodulevent(event));
4213b7579f77SDag-Erling Smørgrav 	if(iq) log_query_info(VERB_QUERY, "iterator operate: query",
4214b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
4215b7579f77SDag-Erling Smørgrav 	if(iq && qstate->qinfo.qname != iq->qchase.qname)
4216b7579f77SDag-Erling Smørgrav 		log_query_info(VERB_QUERY, "iterator operate: chased to",
4217b7579f77SDag-Erling Smørgrav 			&iq->qchase);
4218b7579f77SDag-Erling Smørgrav 
4219b7579f77SDag-Erling Smørgrav 	/* perform iterator state machine */
4220b7579f77SDag-Erling Smørgrav 	if((event == module_event_new || event == module_event_pass) &&
4221b7579f77SDag-Erling Smørgrav 		iq == NULL) {
4222b7579f77SDag-Erling Smørgrav 		if(!iter_new(qstate, id)) {
42234c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, new iterator module allocation");
4224b7579f77SDag-Erling Smørgrav 			(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
4225b7579f77SDag-Erling Smørgrav 			return;
4226b7579f77SDag-Erling Smørgrav 		}
4227b7579f77SDag-Erling Smørgrav 		iq = (struct iter_qstate*)qstate->minfo[id];
4228b7579f77SDag-Erling Smørgrav 		process_request(qstate, iq, ie, id);
4229b7579f77SDag-Erling Smørgrav 		return;
4230b7579f77SDag-Erling Smørgrav 	}
4231b7579f77SDag-Erling Smørgrav 	if(iq && event == module_event_pass) {
4232b7579f77SDag-Erling Smørgrav 		iter_handle(qstate, iq, ie, id);
4233b7579f77SDag-Erling Smørgrav 		return;
4234b7579f77SDag-Erling Smørgrav 	}
4235b7579f77SDag-Erling Smørgrav 	if(iq && outbound) {
4236b7579f77SDag-Erling Smørgrav 		process_response(qstate, iq, ie, id, outbound, event);
4237b7579f77SDag-Erling Smørgrav 		return;
4238b7579f77SDag-Erling Smørgrav 	}
4239b7579f77SDag-Erling Smørgrav 	if(event == module_event_error) {
4240b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "got called with event error, giving up");
42414c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "iterator module got the error event");
4242b7579f77SDag-Erling Smørgrav 		(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
4243b7579f77SDag-Erling Smørgrav 		return;
4244b7579f77SDag-Erling Smørgrav 	}
4245b7579f77SDag-Erling Smørgrav 
4246b7579f77SDag-Erling Smørgrav 	log_err("bad event for iterator");
42474c75e3aaSDag-Erling Smørgrav 	errinf(qstate, "iterator module received wrong event");
4248b7579f77SDag-Erling Smørgrav 	(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
4249b7579f77SDag-Erling Smørgrav }
4250b7579f77SDag-Erling Smørgrav 
4251b7579f77SDag-Erling Smørgrav void
4252b7579f77SDag-Erling Smørgrav iter_clear(struct module_qstate* qstate, int id)
4253b7579f77SDag-Erling Smørgrav {
4254b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq;
4255b7579f77SDag-Erling Smørgrav 	if(!qstate)
4256b7579f77SDag-Erling Smørgrav 		return;
4257b7579f77SDag-Erling Smørgrav 	iq = (struct iter_qstate*)qstate->minfo[id];
4258b7579f77SDag-Erling Smørgrav 	if(iq) {
4259b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
42600a92a9fcSCy Schubert 		if(iq->target_count && --iq->target_count[TARGET_COUNT_REF] == 0) {
426152df462fSXin LI 			free(iq->target_count);
42620a92a9fcSCy Schubert 			if(*iq->nxns_dp) free(*iq->nxns_dp);
42630a92a9fcSCy Schubert 			free(iq->nxns_dp);
42640a92a9fcSCy Schubert 		}
4265b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
4266b7579f77SDag-Erling Smørgrav 	}
4267b7579f77SDag-Erling Smørgrav 	qstate->minfo[id] = NULL;
4268b7579f77SDag-Erling Smørgrav }
4269b7579f77SDag-Erling Smørgrav 
4270b7579f77SDag-Erling Smørgrav size_t
4271b7579f77SDag-Erling Smørgrav iter_get_mem(struct module_env* env, int id)
4272b7579f77SDag-Erling Smørgrav {
4273b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)env->modinfo[id];
4274b7579f77SDag-Erling Smørgrav 	if(!ie)
4275b7579f77SDag-Erling Smørgrav 		return 0;
4276b7579f77SDag-Erling Smørgrav 	return sizeof(*ie) + sizeof(int)*((size_t)ie->max_dependency_depth+1)
4277b7579f77SDag-Erling Smørgrav 		+ donotq_get_mem(ie->donotq) + priv_get_mem(ie->priv);
4278b7579f77SDag-Erling Smørgrav }
4279b7579f77SDag-Erling Smørgrav 
4280b7579f77SDag-Erling Smørgrav /**
4281b7579f77SDag-Erling Smørgrav  * The iterator function block
4282b7579f77SDag-Erling Smørgrav  */
4283b7579f77SDag-Erling Smørgrav static struct module_func_block iter_block = {
4284b7579f77SDag-Erling Smørgrav 	"iterator",
4285b7579f77SDag-Erling Smørgrav 	&iter_init, &iter_deinit, &iter_operate, &iter_inform_super,
4286b7579f77SDag-Erling Smørgrav 	&iter_clear, &iter_get_mem
4287b7579f77SDag-Erling Smørgrav };
4288b7579f77SDag-Erling Smørgrav 
4289b7579f77SDag-Erling Smørgrav struct module_func_block*
4290b7579f77SDag-Erling Smørgrav iter_get_funcblock(void)
4291b7579f77SDag-Erling Smørgrav {
4292b7579f77SDag-Erling Smørgrav 	return &iter_block;
4293b7579f77SDag-Erling Smørgrav }
4294b7579f77SDag-Erling Smørgrav 
4295b7579f77SDag-Erling Smørgrav const char*
4296b7579f77SDag-Erling Smørgrav iter_state_to_string(enum iter_state state)
4297b7579f77SDag-Erling Smørgrav {
4298b7579f77SDag-Erling Smørgrav 	switch (state)
4299b7579f77SDag-Erling Smørgrav 	{
4300b7579f77SDag-Erling Smørgrav 	case INIT_REQUEST_STATE :
4301b7579f77SDag-Erling Smørgrav 		return "INIT REQUEST STATE";
4302b7579f77SDag-Erling Smørgrav 	case INIT_REQUEST_2_STATE :
4303b7579f77SDag-Erling Smørgrav 		return "INIT REQUEST STATE (stage 2)";
4304b7579f77SDag-Erling Smørgrav 	case INIT_REQUEST_3_STATE:
4305b7579f77SDag-Erling Smørgrav 		return "INIT REQUEST STATE (stage 3)";
4306b7579f77SDag-Erling Smørgrav 	case QUERYTARGETS_STATE :
4307b7579f77SDag-Erling Smørgrav 		return "QUERY TARGETS STATE";
4308b7579f77SDag-Erling Smørgrav 	case PRIME_RESP_STATE :
4309b7579f77SDag-Erling Smørgrav 		return "PRIME RESPONSE STATE";
4310b7579f77SDag-Erling Smørgrav 	case COLLECT_CLASS_STATE :
4311b7579f77SDag-Erling Smørgrav 		return "COLLECT CLASS STATE";
4312b7579f77SDag-Erling Smørgrav 	case DSNS_FIND_STATE :
4313b7579f77SDag-Erling Smørgrav 		return "DSNS FIND STATE";
4314b7579f77SDag-Erling Smørgrav 	case QUERY_RESP_STATE :
4315b7579f77SDag-Erling Smørgrav 		return "QUERY RESPONSE STATE";
4316b7579f77SDag-Erling Smørgrav 	case FINISHED_STATE :
4317b7579f77SDag-Erling Smørgrav 		return "FINISHED RESPONSE STATE";
4318b7579f77SDag-Erling Smørgrav 	default :
4319b7579f77SDag-Erling Smørgrav 		return "UNKNOWN ITER STATE";
4320b7579f77SDag-Erling Smørgrav 	}
4321b7579f77SDag-Erling Smørgrav }
4322b7579f77SDag-Erling Smørgrav 
4323b7579f77SDag-Erling Smørgrav int
4324b7579f77SDag-Erling Smørgrav iter_state_is_responsestate(enum iter_state s)
4325b7579f77SDag-Erling Smørgrav {
4326b7579f77SDag-Erling Smørgrav 	switch(s) {
4327b7579f77SDag-Erling Smørgrav 		case INIT_REQUEST_STATE :
4328b7579f77SDag-Erling Smørgrav 		case INIT_REQUEST_2_STATE :
4329b7579f77SDag-Erling Smørgrav 		case INIT_REQUEST_3_STATE :
4330b7579f77SDag-Erling Smørgrav 		case QUERYTARGETS_STATE :
4331b7579f77SDag-Erling Smørgrav 		case COLLECT_CLASS_STATE :
4332b7579f77SDag-Erling Smørgrav 			return 0;
4333b7579f77SDag-Erling Smørgrav 		default:
4334b7579f77SDag-Erling Smørgrav 			break;
4335b7579f77SDag-Erling Smørgrav 	}
4336b7579f77SDag-Erling Smørgrav 	return 1;
4337b7579f77SDag-Erling Smørgrav }
4338