xref: /freebsd/contrib/unbound/iterator/iterator.c (revision 0eefd3079a04edf4cf315403beb0344724567f42)
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;
74e86b9096SDag-Erling Smørgrav 
75b7579f77SDag-Erling Smørgrav int
76b7579f77SDag-Erling Smørgrav iter_init(struct module_env* env, int id)
77b7579f77SDag-Erling Smørgrav {
78b7579f77SDag-Erling Smørgrav 	struct iter_env* iter_env = (struct iter_env*)calloc(1,
79b7579f77SDag-Erling Smørgrav 		sizeof(struct iter_env));
80b7579f77SDag-Erling Smørgrav 	if(!iter_env) {
81b7579f77SDag-Erling Smørgrav 		log_err("malloc failure");
82b7579f77SDag-Erling Smørgrav 		return 0;
83b7579f77SDag-Erling Smørgrav 	}
84b7579f77SDag-Erling Smørgrav 	env->modinfo[id] = (void*)iter_env;
85971980c3SDag-Erling Smørgrav 
86971980c3SDag-Erling Smørgrav 	lock_basic_init(&iter_env->queries_ratelimit_lock);
87971980c3SDag-Erling Smørgrav 	lock_protect(&iter_env->queries_ratelimit_lock,
88971980c3SDag-Erling Smørgrav 			&iter_env->num_queries_ratelimited,
89971980c3SDag-Erling Smørgrav 		sizeof(iter_env->num_queries_ratelimited));
90971980c3SDag-Erling Smørgrav 
91b7579f77SDag-Erling Smørgrav 	if(!iter_apply_cfg(iter_env, env->cfg)) {
92b7579f77SDag-Erling Smørgrav 		log_err("iterator: could not apply configuration settings.");
93b7579f77SDag-Erling Smørgrav 		return 0;
94b7579f77SDag-Erling Smørgrav 	}
9505ab2901SDag-Erling Smørgrav 
96b7579f77SDag-Erling Smørgrav 	return 1;
97b7579f77SDag-Erling Smørgrav }
98b7579f77SDag-Erling Smørgrav 
9909a3aaf3SDag-Erling Smørgrav /** delete caps_whitelist element */
10009a3aaf3SDag-Erling Smørgrav static void
1013005e0a3SDag-Erling Smørgrav caps_free(struct rbnode_type* n, void* ATTR_UNUSED(d))
10209a3aaf3SDag-Erling Smørgrav {
10309a3aaf3SDag-Erling Smørgrav 	if(n) {
10409a3aaf3SDag-Erling Smørgrav 		free(((struct name_tree_node*)n)->name);
10509a3aaf3SDag-Erling Smørgrav 		free(n);
10609a3aaf3SDag-Erling Smørgrav 	}
10709a3aaf3SDag-Erling Smørgrav }
10809a3aaf3SDag-Erling Smørgrav 
109b7579f77SDag-Erling Smørgrav void
110b7579f77SDag-Erling Smørgrav iter_deinit(struct module_env* env, int id)
111b7579f77SDag-Erling Smørgrav {
112b7579f77SDag-Erling Smørgrav 	struct iter_env* iter_env;
113b7579f77SDag-Erling Smørgrav 	if(!env || !env->modinfo[id])
114b7579f77SDag-Erling Smørgrav 		return;
115b7579f77SDag-Erling Smørgrav 	iter_env = (struct iter_env*)env->modinfo[id];
116971980c3SDag-Erling Smørgrav 	lock_basic_destroy(&iter_env->queries_ratelimit_lock);
117b7579f77SDag-Erling Smørgrav 	free(iter_env->target_fetch_policy);
118b7579f77SDag-Erling Smørgrav 	priv_delete(iter_env->priv);
119b7579f77SDag-Erling Smørgrav 	donotq_delete(iter_env->donotq);
12009a3aaf3SDag-Erling Smørgrav 	if(iter_env->caps_white) {
12109a3aaf3SDag-Erling Smørgrav 		traverse_postorder(iter_env->caps_white, caps_free, NULL);
12209a3aaf3SDag-Erling Smørgrav 		free(iter_env->caps_white);
12309a3aaf3SDag-Erling Smørgrav 	}
124b7579f77SDag-Erling Smørgrav 	free(iter_env);
125b7579f77SDag-Erling Smørgrav 	env->modinfo[id] = NULL;
126b7579f77SDag-Erling Smørgrav }
127b7579f77SDag-Erling Smørgrav 
128b7579f77SDag-Erling Smørgrav /** new query for iterator */
129b7579f77SDag-Erling Smørgrav static int
130b7579f77SDag-Erling Smørgrav iter_new(struct module_qstate* qstate, int id)
131b7579f77SDag-Erling Smørgrav {
132b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)regional_alloc(
133b7579f77SDag-Erling Smørgrav 		qstate->region, sizeof(struct iter_qstate));
134b7579f77SDag-Erling Smørgrav 	qstate->minfo[id] = iq;
135b7579f77SDag-Erling Smørgrav 	if(!iq)
136b7579f77SDag-Erling Smørgrav 		return 0;
137b7579f77SDag-Erling Smørgrav 	memset(iq, 0, sizeof(*iq));
138b7579f77SDag-Erling Smørgrav 	iq->state = INIT_REQUEST_STATE;
139b7579f77SDag-Erling Smørgrav 	iq->final_state = FINISHED_STATE;
140b7579f77SDag-Erling Smørgrav 	iq->an_prepend_list = NULL;
141b7579f77SDag-Erling Smørgrav 	iq->an_prepend_last = NULL;
142b7579f77SDag-Erling Smørgrav 	iq->ns_prepend_list = NULL;
143b7579f77SDag-Erling Smørgrav 	iq->ns_prepend_last = NULL;
144b7579f77SDag-Erling Smørgrav 	iq->dp = NULL;
145b7579f77SDag-Erling Smørgrav 	iq->depth = 0;
146b7579f77SDag-Erling Smørgrav 	iq->num_target_queries = 0;
147b7579f77SDag-Erling Smørgrav 	iq->num_current_queries = 0;
148b7579f77SDag-Erling Smørgrav 	iq->query_restart_count = 0;
149b7579f77SDag-Erling Smørgrav 	iq->referral_count = 0;
150b7579f77SDag-Erling Smørgrav 	iq->sent_count = 0;
15109a3aaf3SDag-Erling Smørgrav 	iq->ratelimit_ok = 0;
15252df462fSXin LI 	iq->target_count = NULL;
153b7579f77SDag-Erling Smørgrav 	iq->wait_priming_stub = 0;
154b7579f77SDag-Erling Smørgrav 	iq->refetch_glue = 0;
155b7579f77SDag-Erling Smørgrav 	iq->dnssec_expected = 0;
156b7579f77SDag-Erling Smørgrav 	iq->dnssec_lame_query = 0;
157b7579f77SDag-Erling Smørgrav 	iq->chase_flags = qstate->query_flags;
158b7579f77SDag-Erling Smørgrav 	/* Start with the (current) qname. */
159b7579f77SDag-Erling Smørgrav 	iq->qchase = qstate->qinfo;
160b7579f77SDag-Erling Smørgrav 	outbound_list_init(&iq->outlist);
161e2d15004SDag-Erling Smørgrav 	iq->minimise_count = 0;
162b5663de9SDag-Erling Smørgrav 	iq->minimise_timeout_count = 0;
16305ab2901SDag-Erling Smørgrav 	if (qstate->env->cfg->qname_minimisation)
16405ab2901SDag-Erling Smørgrav 		iq->minimisation_state = INIT_MINIMISE_STATE;
16505ab2901SDag-Erling Smørgrav 	else
16605ab2901SDag-Erling Smørgrav 		iq->minimisation_state = DONOT_MINIMISE_STATE;
16705ab2901SDag-Erling Smørgrav 
16805ab2901SDag-Erling Smørgrav 	memset(&iq->qinfo_out, 0, sizeof(struct query_info));
169b7579f77SDag-Erling Smørgrav 	return 1;
170b7579f77SDag-Erling Smørgrav }
171b7579f77SDag-Erling Smørgrav 
172b7579f77SDag-Erling Smørgrav /**
173b7579f77SDag-Erling Smørgrav  * Transition to the next state. This can be used to advance a currently
174b7579f77SDag-Erling Smørgrav  * processing event. It cannot be used to reactivate a forEvent.
175b7579f77SDag-Erling Smørgrav  *
176b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state
177b7579f77SDag-Erling Smørgrav  * @param nextstate The state to transition to.
178b7579f77SDag-Erling Smørgrav  * @return true. This is so this can be called as the return value for the
179b7579f77SDag-Erling Smørgrav  *         actual process*State() methods. (Transitioning to the next state
180b7579f77SDag-Erling Smørgrav  *         implies further processing).
181b7579f77SDag-Erling Smørgrav  */
182b7579f77SDag-Erling Smørgrav static int
183b7579f77SDag-Erling Smørgrav next_state(struct iter_qstate* iq, enum iter_state nextstate)
184b7579f77SDag-Erling Smørgrav {
185b7579f77SDag-Erling Smørgrav 	/* If transitioning to a "response" state, make sure that there is a
186b7579f77SDag-Erling Smørgrav 	 * response */
187b7579f77SDag-Erling Smørgrav 	if(iter_state_is_responsestate(nextstate)) {
188b7579f77SDag-Erling Smørgrav 		if(iq->response == NULL) {
189b7579f77SDag-Erling Smørgrav 			log_err("transitioning to response state sans "
190b7579f77SDag-Erling Smørgrav 				"response.");
191b7579f77SDag-Erling Smørgrav 		}
192b7579f77SDag-Erling Smørgrav 	}
193b7579f77SDag-Erling Smørgrav 	iq->state = nextstate;
194b7579f77SDag-Erling Smørgrav 	return 1;
195b7579f77SDag-Erling Smørgrav }
196b7579f77SDag-Erling Smørgrav 
197b7579f77SDag-Erling Smørgrav /**
198b7579f77SDag-Erling Smørgrav  * Transition an event to its final state. Final states always either return
199b7579f77SDag-Erling Smørgrav  * a result up the module chain, or reactivate a dependent event. Which
20005ab2901SDag-Erling Smørgrav  * final state to transition to is set in the module state for the event when
201b7579f77SDag-Erling Smørgrav  * it was created, and depends on the original purpose of the event.
202b7579f77SDag-Erling Smørgrav  *
203b7579f77SDag-Erling Smørgrav  * The response is stored in the qstate->buf buffer.
204b7579f77SDag-Erling Smørgrav  *
205b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state
206b7579f77SDag-Erling Smørgrav  * @return false. This is so this method can be used as the return value for
207b7579f77SDag-Erling Smørgrav  *         the processState methods. (Transitioning to the final state
208b7579f77SDag-Erling Smørgrav  */
209b7579f77SDag-Erling Smørgrav static int
210b7579f77SDag-Erling Smørgrav final_state(struct iter_qstate* iq)
211b7579f77SDag-Erling Smørgrav {
212b7579f77SDag-Erling Smørgrav 	return next_state(iq, iq->final_state);
213b7579f77SDag-Erling Smørgrav }
214b7579f77SDag-Erling Smørgrav 
215b7579f77SDag-Erling Smørgrav /**
216b7579f77SDag-Erling Smørgrav  * Callback routine to handle errors in parent query states
217b7579f77SDag-Erling Smørgrav  * @param qstate: query state that failed.
218b7579f77SDag-Erling Smørgrav  * @param id: module id.
219b7579f77SDag-Erling Smørgrav  * @param super: super state.
220b7579f77SDag-Erling Smørgrav  */
221b7579f77SDag-Erling Smørgrav static void
222b7579f77SDag-Erling Smørgrav error_supers(struct module_qstate* qstate, int id, struct module_qstate* super)
223b7579f77SDag-Erling Smørgrav {
224b7579f77SDag-Erling Smørgrav 	struct iter_qstate* super_iq = (struct iter_qstate*)super->minfo[id];
225b7579f77SDag-Erling Smørgrav 
226b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_A ||
227b7579f77SDag-Erling Smørgrav 		qstate->qinfo.qtype == LDNS_RR_TYPE_AAAA) {
228b7579f77SDag-Erling Smørgrav 		/* mark address as failed. */
229b7579f77SDag-Erling Smørgrav 		struct delegpt_ns* dpns = NULL;
230b5663de9SDag-Erling Smørgrav 		super_iq->num_target_queries--;
231b7579f77SDag-Erling Smørgrav 		if(super_iq->dp)
232b7579f77SDag-Erling Smørgrav 			dpns = delegpt_find_ns(super_iq->dp,
233b7579f77SDag-Erling Smørgrav 				qstate->qinfo.qname, qstate->qinfo.qname_len);
234b7579f77SDag-Erling Smørgrav 		if(!dpns) {
235b7579f77SDag-Erling Smørgrav 			/* not interested */
2364c75e3aaSDag-Erling Smørgrav 			/* this can happen, for eg. qname minimisation asked
2374c75e3aaSDag-Erling Smørgrav 			 * for an NXDOMAIN to be validated, and used qtype
2384c75e3aaSDag-Erling Smørgrav 			 * A for that, and the error of that, the name, is
2394c75e3aaSDag-Erling Smørgrav 			 * not listed in super_iq->dp */
240b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "subq error, but not interested");
241b7579f77SDag-Erling Smørgrav 			log_query_info(VERB_ALGO, "superq", &super->qinfo);
242b7579f77SDag-Erling Smørgrav 			return;
243b7579f77SDag-Erling Smørgrav 		} else {
244b7579f77SDag-Erling Smørgrav 			/* see if the failure did get (parent-lame) info */
245bc892140SDag-Erling Smørgrav 			if(!cache_fill_missing(super->env, super_iq->qchase.qclass,
246bc892140SDag-Erling Smørgrav 				super->region, super_iq->dp))
247b7579f77SDag-Erling Smørgrav 				log_err("out of memory adding missing");
248b7579f77SDag-Erling Smørgrav 		}
249b7579f77SDag-Erling Smørgrav 		dpns->resolved = 1; /* mark as failed */
250b7579f77SDag-Erling Smørgrav 	}
251b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_NS) {
252b7579f77SDag-Erling Smørgrav 		/* prime failed to get delegation */
253b7579f77SDag-Erling Smørgrav 		super_iq->dp = NULL;
254b7579f77SDag-Erling Smørgrav 	}
255b7579f77SDag-Erling Smørgrav 	/* evaluate targets again */
256b7579f77SDag-Erling Smørgrav 	super_iq->state = QUERYTARGETS_STATE;
257b7579f77SDag-Erling Smørgrav 	/* super becomes runnable, and will process this change */
258b7579f77SDag-Erling Smørgrav }
259b7579f77SDag-Erling Smørgrav 
260b7579f77SDag-Erling Smørgrav /**
261b7579f77SDag-Erling Smørgrav  * Return an error to the client
262b7579f77SDag-Erling Smørgrav  * @param qstate: our query state
263b7579f77SDag-Erling Smørgrav  * @param id: module id
264b7579f77SDag-Erling Smørgrav  * @param rcode: error code (DNS errcode).
265b7579f77SDag-Erling Smørgrav  * @return: 0 for use by caller, to make notation easy, like:
266b7579f77SDag-Erling Smørgrav  * 	return error_response(..).
267b7579f77SDag-Erling Smørgrav  */
268b7579f77SDag-Erling Smørgrav static int
269b7579f77SDag-Erling Smørgrav error_response(struct module_qstate* qstate, int id, int rcode)
270b7579f77SDag-Erling Smørgrav {
271b7579f77SDag-Erling Smørgrav 	verbose(VERB_QUERY, "return error response %s",
27217d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rcodes, rcode)?
27317d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rcodes, rcode)->name:"??");
274b7579f77SDag-Erling Smørgrav 	qstate->return_rcode = rcode;
275b7579f77SDag-Erling Smørgrav 	qstate->return_msg = NULL;
276b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_finished;
277b7579f77SDag-Erling Smørgrav 	return 0;
278b7579f77SDag-Erling Smørgrav }
279b7579f77SDag-Erling Smørgrav 
280b7579f77SDag-Erling Smørgrav /**
281b7579f77SDag-Erling Smørgrav  * Return an error to the client and cache the error code in the
282b7579f77SDag-Erling Smørgrav  * message cache (so per qname, qtype, qclass).
283b7579f77SDag-Erling Smørgrav  * @param qstate: our query state
284b7579f77SDag-Erling Smørgrav  * @param id: module id
285b7579f77SDag-Erling Smørgrav  * @param rcode: error code (DNS errcode).
286b7579f77SDag-Erling Smørgrav  * @return: 0 for use by caller, to make notation easy, like:
287b7579f77SDag-Erling Smørgrav  * 	return error_response(..).
288b7579f77SDag-Erling Smørgrav  */
289b7579f77SDag-Erling Smørgrav static int
290b7579f77SDag-Erling Smørgrav error_response_cache(struct module_qstate* qstate, int id, int rcode)
291b7579f77SDag-Erling Smørgrav {
292bc892140SDag-Erling Smørgrav 	if(!qstate->no_cache_store) {
293b7579f77SDag-Erling Smørgrav 		/* store in cache */
294b7579f77SDag-Erling Smørgrav 		struct reply_info err;
295ff825849SDag-Erling Smørgrav 		if(qstate->prefetch_leeway > NORR_TTL) {
296ff825849SDag-Erling Smørgrav 			verbose(VERB_ALGO, "error response for prefetch in cache");
297ff825849SDag-Erling Smørgrav 			/* attempt to adjust the cache entry prefetch */
298ff825849SDag-Erling Smørgrav 			if(dns_cache_prefetch_adjust(qstate->env, &qstate->qinfo,
299ff825849SDag-Erling Smørgrav 				NORR_TTL, qstate->query_flags))
300ff825849SDag-Erling Smørgrav 				return error_response(qstate, id, rcode);
301ff825849SDag-Erling Smørgrav 			/* if that fails (not in cache), fall through to store err */
302ff825849SDag-Erling Smørgrav 		}
303c7f4d7adSDag-Erling Smørgrav 		if(qstate->env->cfg->serve_expired) {
304c7f4d7adSDag-Erling Smørgrav 			/* if serving expired contents, and such content is
305c7f4d7adSDag-Erling Smørgrav 			 * already available, don't overwrite this servfail */
306c7f4d7adSDag-Erling Smørgrav 			struct msgreply_entry* msg;
307c7f4d7adSDag-Erling Smørgrav 			if((msg=msg_cache_lookup(qstate->env,
308c7f4d7adSDag-Erling Smørgrav 				qstate->qinfo.qname, qstate->qinfo.qname_len,
309c7f4d7adSDag-Erling Smørgrav 				qstate->qinfo.qtype, qstate->qinfo.qclass,
3104c75e3aaSDag-Erling Smørgrav 				qstate->query_flags, 0,
3114c75e3aaSDag-Erling Smørgrav 				qstate->env->cfg->serve_expired_ttl_reset))
312c7f4d7adSDag-Erling Smørgrav 				!= NULL) {
3134c75e3aaSDag-Erling Smørgrav 				if(qstate->env->cfg->serve_expired_ttl_reset) {
3144c75e3aaSDag-Erling Smørgrav 					struct reply_info* rep =
3154c75e3aaSDag-Erling Smørgrav 						(struct reply_info*)msg->entry.data;
3164c75e3aaSDag-Erling Smørgrav 					if(rep && *qstate->env->now +
3174c75e3aaSDag-Erling Smørgrav 						qstate->env->cfg->serve_expired_ttl  >
3184c75e3aaSDag-Erling Smørgrav 						rep->serve_expired_ttl) {
3194c75e3aaSDag-Erling Smørgrav 						rep->serve_expired_ttl =
3204c75e3aaSDag-Erling Smørgrav 							*qstate->env->now +
3214c75e3aaSDag-Erling Smørgrav 							qstate->env->cfg->serve_expired_ttl;
3224c75e3aaSDag-Erling Smørgrav 					}
3234c75e3aaSDag-Erling Smørgrav 				}
324c7f4d7adSDag-Erling Smørgrav 				lock_rw_unlock(&msg->entry.lock);
325c7f4d7adSDag-Erling Smørgrav 				return error_response(qstate, id, rcode);
326c7f4d7adSDag-Erling Smørgrav 			}
327c7f4d7adSDag-Erling Smørgrav 			/* serving expired contents, but nothing is cached
328c7f4d7adSDag-Erling Smørgrav 			 * at all, so the servfail cache entry is useful
329c7f4d7adSDag-Erling Smørgrav 			 * (stops waste of time on this servfail NORR_TTL) */
330e86b9096SDag-Erling Smørgrav 		} else {
331e86b9096SDag-Erling Smørgrav 			/* don't overwrite existing (non-expired) data in
332e86b9096SDag-Erling Smørgrav 			 * cache with a servfail */
333e86b9096SDag-Erling Smørgrav 			struct msgreply_entry* msg;
334e86b9096SDag-Erling Smørgrav 			if((msg=msg_cache_lookup(qstate->env,
335e86b9096SDag-Erling Smørgrav 				qstate->qinfo.qname, qstate->qinfo.qname_len,
336e86b9096SDag-Erling Smørgrav 				qstate->qinfo.qtype, qstate->qinfo.qclass,
337e86b9096SDag-Erling Smørgrav 				qstate->query_flags, *qstate->env->now, 0))
338e86b9096SDag-Erling Smørgrav 				!= NULL) {
339e86b9096SDag-Erling Smørgrav 				struct reply_info* rep = (struct reply_info*)
340e86b9096SDag-Erling Smørgrav 					msg->entry.data;
341e86b9096SDag-Erling Smørgrav 				if(FLAGS_GET_RCODE(rep->flags) ==
342e86b9096SDag-Erling Smørgrav 					LDNS_RCODE_NOERROR ||
343e86b9096SDag-Erling Smørgrav 					FLAGS_GET_RCODE(rep->flags) ==
344e86b9096SDag-Erling Smørgrav 					LDNS_RCODE_NXDOMAIN) {
345e86b9096SDag-Erling Smørgrav 					/* we have a good entry,
346e86b9096SDag-Erling Smørgrav 					 * don't overwrite */
347e86b9096SDag-Erling Smørgrav 					lock_rw_unlock(&msg->entry.lock);
348e86b9096SDag-Erling Smørgrav 					return error_response(qstate, id, rcode);
349e86b9096SDag-Erling Smørgrav 				}
350e86b9096SDag-Erling Smørgrav 				lock_rw_unlock(&msg->entry.lock);
351e86b9096SDag-Erling Smørgrav 			}
352e86b9096SDag-Erling Smørgrav 
353c7f4d7adSDag-Erling Smørgrav 		}
354b7579f77SDag-Erling Smørgrav 		memset(&err, 0, sizeof(err));
355b7579f77SDag-Erling Smørgrav 		err.flags = (uint16_t)(BIT_QR | BIT_RA);
356b7579f77SDag-Erling Smørgrav 		FLAGS_SET_RCODE(err.flags, rcode);
357b7579f77SDag-Erling Smørgrav 		err.qdcount = 1;
358b7579f77SDag-Erling Smørgrav 		err.ttl = NORR_TTL;
359b7579f77SDag-Erling Smørgrav 		err.prefetch_ttl = PREFETCH_TTL_CALC(err.ttl);
3604c75e3aaSDag-Erling Smørgrav 		err.serve_expired_ttl = NORR_TTL;
361b7579f77SDag-Erling Smørgrav 		/* do not waste time trying to validate this servfail */
362b7579f77SDag-Erling Smørgrav 		err.security = sec_status_indeterminate;
363b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "store error response in message cache");
364ff825849SDag-Erling Smørgrav 		iter_dns_store(qstate->env, &qstate->qinfo, &err, 0, 0, 0, NULL,
365ff825849SDag-Erling Smørgrav 			qstate->query_flags);
366bc892140SDag-Erling Smørgrav 	}
367b7579f77SDag-Erling Smørgrav 	return error_response(qstate, id, rcode);
368b7579f77SDag-Erling Smørgrav }
369b7579f77SDag-Erling Smørgrav 
370b7579f77SDag-Erling Smørgrav /** check if prepend item is duplicate item */
371b7579f77SDag-Erling Smørgrav static int
372b7579f77SDag-Erling Smørgrav prepend_is_duplicate(struct ub_packed_rrset_key** sets, size_t to,
373b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* dup)
374b7579f77SDag-Erling Smørgrav {
375b7579f77SDag-Erling Smørgrav 	size_t i;
376b7579f77SDag-Erling Smørgrav 	for(i=0; i<to; i++) {
377b7579f77SDag-Erling Smørgrav 		if(sets[i]->rk.type == dup->rk.type &&
378b7579f77SDag-Erling Smørgrav 			sets[i]->rk.rrset_class == dup->rk.rrset_class &&
379b7579f77SDag-Erling Smørgrav 			sets[i]->rk.dname_len == dup->rk.dname_len &&
380b7579f77SDag-Erling Smørgrav 			query_dname_compare(sets[i]->rk.dname, dup->rk.dname)
381b7579f77SDag-Erling Smørgrav 			== 0)
382b7579f77SDag-Erling Smørgrav 			return 1;
383b7579f77SDag-Erling Smørgrav 	}
384b7579f77SDag-Erling Smørgrav 	return 0;
385b7579f77SDag-Erling Smørgrav }
386b7579f77SDag-Erling Smørgrav 
387b7579f77SDag-Erling Smørgrav /** prepend the prepend list in the answer and authority section of dns_msg */
388b7579f77SDag-Erling Smørgrav static int
389b7579f77SDag-Erling Smørgrav iter_prepend(struct iter_qstate* iq, struct dns_msg* msg,
390b7579f77SDag-Erling Smørgrav 	struct regional* region)
391b7579f77SDag-Erling Smørgrav {
392b7579f77SDag-Erling Smørgrav 	struct iter_prep_list* p;
393b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key** sets;
394b7579f77SDag-Erling Smørgrav 	size_t num_an = 0, num_ns = 0;;
395b7579f77SDag-Erling Smørgrav 	for(p = iq->an_prepend_list; p; p = p->next)
396b7579f77SDag-Erling Smørgrav 		num_an++;
397b7579f77SDag-Erling Smørgrav 	for(p = iq->ns_prepend_list; p; p = p->next)
398b7579f77SDag-Erling Smørgrav 		num_ns++;
399b7579f77SDag-Erling Smørgrav 	if(num_an + num_ns == 0)
400b7579f77SDag-Erling Smørgrav 		return 1;
401b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "prepending %d rrsets", (int)num_an + (int)num_ns);
40209a3aaf3SDag-Erling Smørgrav 	if(num_an > RR_COUNT_MAX || num_ns > RR_COUNT_MAX ||
40309a3aaf3SDag-Erling Smørgrav 		msg->rep->rrset_count > RR_COUNT_MAX) return 0; /* overflow */
404b7579f77SDag-Erling Smørgrav 	sets = regional_alloc(region, (num_an+num_ns+msg->rep->rrset_count) *
405b7579f77SDag-Erling Smørgrav 		sizeof(struct ub_packed_rrset_key*));
406b7579f77SDag-Erling Smørgrav 	if(!sets)
407b7579f77SDag-Erling Smørgrav 		return 0;
408b7579f77SDag-Erling Smørgrav 	/* ANSWER section */
409b7579f77SDag-Erling Smørgrav 	num_an = 0;
410b7579f77SDag-Erling Smørgrav 	for(p = iq->an_prepend_list; p; p = p->next) {
411b7579f77SDag-Erling Smørgrav 		sets[num_an++] = p->rrset;
412*0eefd307SCy Schubert 		if(ub_packed_rrset_ttl(p->rrset) < msg->rep->ttl)
413*0eefd307SCy Schubert 			msg->rep->ttl = ub_packed_rrset_ttl(p->rrset);
414b7579f77SDag-Erling Smørgrav 	}
415b7579f77SDag-Erling Smørgrav 	memcpy(sets+num_an, msg->rep->rrsets, msg->rep->an_numrrsets *
416b7579f77SDag-Erling Smørgrav 		sizeof(struct ub_packed_rrset_key*));
417b7579f77SDag-Erling Smørgrav 	/* AUTH section */
418b7579f77SDag-Erling Smørgrav 	num_ns = 0;
419b7579f77SDag-Erling Smørgrav 	for(p = iq->ns_prepend_list; p; p = p->next) {
420b7579f77SDag-Erling Smørgrav 		if(prepend_is_duplicate(sets+msg->rep->an_numrrsets+num_an,
421b7579f77SDag-Erling Smørgrav 			num_ns, p->rrset) || prepend_is_duplicate(
422b7579f77SDag-Erling Smørgrav 			msg->rep->rrsets+msg->rep->an_numrrsets,
423b7579f77SDag-Erling Smørgrav 			msg->rep->ns_numrrsets, p->rrset))
424b7579f77SDag-Erling Smørgrav 			continue;
425b7579f77SDag-Erling Smørgrav 		sets[msg->rep->an_numrrsets + num_an + num_ns++] = p->rrset;
426*0eefd307SCy Schubert 		if(ub_packed_rrset_ttl(p->rrset) < msg->rep->ttl)
427*0eefd307SCy Schubert 			msg->rep->ttl = ub_packed_rrset_ttl(p->rrset);
428b7579f77SDag-Erling Smørgrav 	}
429b7579f77SDag-Erling Smørgrav 	memcpy(sets + num_an + msg->rep->an_numrrsets + num_ns,
430b7579f77SDag-Erling Smørgrav 		msg->rep->rrsets + msg->rep->an_numrrsets,
431b7579f77SDag-Erling Smørgrav 		(msg->rep->ns_numrrsets + msg->rep->ar_numrrsets) *
432b7579f77SDag-Erling Smørgrav 		sizeof(struct ub_packed_rrset_key*));
433b7579f77SDag-Erling Smørgrav 
434b7579f77SDag-Erling Smørgrav 	/* NXDOMAIN rcode can stay if we prepended DNAME/CNAMEs, because
435b7579f77SDag-Erling Smørgrav 	 * this is what recursors should give. */
436b7579f77SDag-Erling Smørgrav 	msg->rep->rrset_count += num_an + num_ns;
437b7579f77SDag-Erling Smørgrav 	msg->rep->an_numrrsets += num_an;
438b7579f77SDag-Erling Smørgrav 	msg->rep->ns_numrrsets += num_ns;
439b7579f77SDag-Erling Smørgrav 	msg->rep->rrsets = sets;
440b7579f77SDag-Erling Smørgrav 	return 1;
441b7579f77SDag-Erling Smørgrav }
442b7579f77SDag-Erling Smørgrav 
443b7579f77SDag-Erling Smørgrav /**
44465b390aaSDag-Erling Smørgrav  * Find rrset in ANSWER prepend list.
44565b390aaSDag-Erling Smørgrav  * to avoid duplicate DNAMEs when a DNAME is traversed twice.
44665b390aaSDag-Erling Smørgrav  * @param iq: iterator query state.
44765b390aaSDag-Erling Smørgrav  * @param rrset: rrset to add.
44865b390aaSDag-Erling Smørgrav  * @return false if not found
44965b390aaSDag-Erling Smørgrav  */
45065b390aaSDag-Erling Smørgrav static int
45165b390aaSDag-Erling Smørgrav iter_find_rrset_in_prepend_answer(struct iter_qstate* iq,
45265b390aaSDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset)
45365b390aaSDag-Erling Smørgrav {
45465b390aaSDag-Erling Smørgrav 	struct iter_prep_list* p = iq->an_prepend_list;
45565b390aaSDag-Erling Smørgrav 	while(p) {
45665b390aaSDag-Erling Smørgrav 		if(ub_rrset_compare(p->rrset, rrset) == 0 &&
45765b390aaSDag-Erling Smørgrav 			rrsetdata_equal((struct packed_rrset_data*)p->rrset
45865b390aaSDag-Erling Smørgrav 			->entry.data, (struct packed_rrset_data*)rrset
45965b390aaSDag-Erling Smørgrav 			->entry.data))
46065b390aaSDag-Erling Smørgrav 			return 1;
46165b390aaSDag-Erling Smørgrav 		p = p->next;
46265b390aaSDag-Erling Smørgrav 	}
46365b390aaSDag-Erling Smørgrav 	return 0;
46465b390aaSDag-Erling Smørgrav }
46565b390aaSDag-Erling Smørgrav 
46665b390aaSDag-Erling Smørgrav /**
467b7579f77SDag-Erling Smørgrav  * Add rrset to ANSWER prepend list
468b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
469b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
470b7579f77SDag-Erling Smørgrav  * @param rrset: rrset to add.
471b7579f77SDag-Erling Smørgrav  * @return false on failure (malloc).
472b7579f77SDag-Erling Smørgrav  */
473b7579f77SDag-Erling Smørgrav static int
474b7579f77SDag-Erling Smørgrav iter_add_prepend_answer(struct module_qstate* qstate, struct iter_qstate* iq,
475b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset)
476b7579f77SDag-Erling Smørgrav {
477b7579f77SDag-Erling Smørgrav 	struct iter_prep_list* p = (struct iter_prep_list*)regional_alloc(
478b7579f77SDag-Erling Smørgrav 		qstate->region, sizeof(struct iter_prep_list));
479b7579f77SDag-Erling Smørgrav 	if(!p)
480b7579f77SDag-Erling Smørgrav 		return 0;
481b7579f77SDag-Erling Smørgrav 	p->rrset = rrset;
482b7579f77SDag-Erling Smørgrav 	p->next = NULL;
483b7579f77SDag-Erling Smørgrav 	/* add at end */
484b7579f77SDag-Erling Smørgrav 	if(iq->an_prepend_last)
485b7579f77SDag-Erling Smørgrav 		iq->an_prepend_last->next = p;
486b7579f77SDag-Erling Smørgrav 	else	iq->an_prepend_list = p;
487b7579f77SDag-Erling Smørgrav 	iq->an_prepend_last = p;
488b7579f77SDag-Erling Smørgrav 	return 1;
489b7579f77SDag-Erling Smørgrav }
490b7579f77SDag-Erling Smørgrav 
491b7579f77SDag-Erling Smørgrav /**
492b7579f77SDag-Erling Smørgrav  * Add rrset to AUTHORITY prepend list
493b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
494b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
495b7579f77SDag-Erling Smørgrav  * @param rrset: rrset to add.
496b7579f77SDag-Erling Smørgrav  * @return false on failure (malloc).
497b7579f77SDag-Erling Smørgrav  */
498b7579f77SDag-Erling Smørgrav static int
499b7579f77SDag-Erling Smørgrav iter_add_prepend_auth(struct module_qstate* qstate, struct iter_qstate* iq,
500b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset)
501b7579f77SDag-Erling Smørgrav {
502b7579f77SDag-Erling Smørgrav 	struct iter_prep_list* p = (struct iter_prep_list*)regional_alloc(
503b7579f77SDag-Erling Smørgrav 		qstate->region, sizeof(struct iter_prep_list));
504b7579f77SDag-Erling Smørgrav 	if(!p)
505b7579f77SDag-Erling Smørgrav 		return 0;
506b7579f77SDag-Erling Smørgrav 	p->rrset = rrset;
507b7579f77SDag-Erling Smørgrav 	p->next = NULL;
508b7579f77SDag-Erling Smørgrav 	/* add at end */
509b7579f77SDag-Erling Smørgrav 	if(iq->ns_prepend_last)
510b7579f77SDag-Erling Smørgrav 		iq->ns_prepend_last->next = p;
511b7579f77SDag-Erling Smørgrav 	else	iq->ns_prepend_list = p;
512b7579f77SDag-Erling Smørgrav 	iq->ns_prepend_last = p;
513b7579f77SDag-Erling Smørgrav 	return 1;
514b7579f77SDag-Erling Smørgrav }
515b7579f77SDag-Erling Smørgrav 
516b7579f77SDag-Erling Smørgrav /**
517b7579f77SDag-Erling Smørgrav  * Given a CNAME response (defined as a response containing a CNAME or DNAME
518b7579f77SDag-Erling Smørgrav  * that does not answer the request), process the response, modifying the
519b7579f77SDag-Erling Smørgrav  * state as necessary. This follows the CNAME/DNAME chain and returns the
520b7579f77SDag-Erling Smørgrav  * final query name.
521b7579f77SDag-Erling Smørgrav  *
522b7579f77SDag-Erling Smørgrav  * sets the new query name, after following the CNAME/DNAME chain.
523b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
524b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
525b7579f77SDag-Erling Smørgrav  * @param msg: the response.
526b7579f77SDag-Erling Smørgrav  * @param mname: returned target new query name.
527b7579f77SDag-Erling Smørgrav  * @param mname_len: length of mname.
528b7579f77SDag-Erling Smørgrav  * @return false on (malloc) error.
529b7579f77SDag-Erling Smørgrav  */
530b7579f77SDag-Erling Smørgrav static int
531b7579f77SDag-Erling Smørgrav handle_cname_response(struct module_qstate* qstate, struct iter_qstate* iq,
532b7579f77SDag-Erling Smørgrav         struct dns_msg* msg, uint8_t** mname, size_t* mname_len)
533b7579f77SDag-Erling Smørgrav {
534b7579f77SDag-Erling Smørgrav 	size_t i;
535b7579f77SDag-Erling Smørgrav 	/* Start with the (current) qname. */
536b7579f77SDag-Erling Smørgrav 	*mname = iq->qchase.qname;
537b7579f77SDag-Erling Smørgrav 	*mname_len = iq->qchase.qname_len;
538b7579f77SDag-Erling Smørgrav 
539b7579f77SDag-Erling Smørgrav 	/* Iterate over the ANSWER rrsets in order, looking for CNAMEs and
540b7579f77SDag-Erling Smørgrav 	 * DNAMES. */
541b7579f77SDag-Erling Smørgrav 	for(i=0; i<msg->rep->an_numrrsets; i++) {
542b7579f77SDag-Erling Smørgrav 		struct ub_packed_rrset_key* r = msg->rep->rrsets[i];
543b7579f77SDag-Erling Smørgrav 		/* If there is a (relevant) DNAME, add it to the list.
544b7579f77SDag-Erling Smørgrav 		 * We always expect there to be CNAME that was generated
545b7579f77SDag-Erling Smørgrav 		 * by this DNAME following, so we don't process the DNAME
546b7579f77SDag-Erling Smørgrav 		 * directly.  */
547b7579f77SDag-Erling Smørgrav 		if(ntohs(r->rk.type) == LDNS_RR_TYPE_DNAME &&
54865b390aaSDag-Erling Smørgrav 			dname_strict_subdomain_c(*mname, r->rk.dname) &&
54965b390aaSDag-Erling Smørgrav 			!iter_find_rrset_in_prepend_answer(iq, r)) {
550b7579f77SDag-Erling Smørgrav 			if(!iter_add_prepend_answer(qstate, iq, r))
551b7579f77SDag-Erling Smørgrav 				return 0;
552b7579f77SDag-Erling Smørgrav 			continue;
553b7579f77SDag-Erling Smørgrav 		}
554b7579f77SDag-Erling Smørgrav 
555b7579f77SDag-Erling Smørgrav 		if(ntohs(r->rk.type) == LDNS_RR_TYPE_CNAME &&
55665b390aaSDag-Erling Smørgrav 			query_dname_compare(*mname, r->rk.dname) == 0 &&
55765b390aaSDag-Erling Smørgrav 			!iter_find_rrset_in_prepend_answer(iq, r)) {
558b7579f77SDag-Erling Smørgrav 			/* Add this relevant CNAME rrset to the prepend list.*/
559b7579f77SDag-Erling Smørgrav 			if(!iter_add_prepend_answer(qstate, iq, r))
560b7579f77SDag-Erling Smørgrav 				return 0;
561b7579f77SDag-Erling Smørgrav 			get_cname_target(r, mname, mname_len);
562b7579f77SDag-Erling Smørgrav 		}
563b7579f77SDag-Erling Smørgrav 
564b7579f77SDag-Erling Smørgrav 		/* Other rrsets in the section are ignored. */
565b7579f77SDag-Erling Smørgrav 	}
566b7579f77SDag-Erling Smørgrav 	/* add authority rrsets to authority prepend, for wildcarded CNAMEs */
567b7579f77SDag-Erling Smørgrav 	for(i=msg->rep->an_numrrsets; i<msg->rep->an_numrrsets +
568b7579f77SDag-Erling Smørgrav 		msg->rep->ns_numrrsets; i++) {
569b7579f77SDag-Erling Smørgrav 		struct ub_packed_rrset_key* r = msg->rep->rrsets[i];
570b7579f77SDag-Erling Smørgrav 		/* only add NSEC/NSEC3, as they may be needed for validation */
571b7579f77SDag-Erling Smørgrav 		if(ntohs(r->rk.type) == LDNS_RR_TYPE_NSEC ||
572b7579f77SDag-Erling Smørgrav 			ntohs(r->rk.type) == LDNS_RR_TYPE_NSEC3) {
573b7579f77SDag-Erling Smørgrav 			if(!iter_add_prepend_auth(qstate, iq, r))
574b7579f77SDag-Erling Smørgrav 				return 0;
575b7579f77SDag-Erling Smørgrav 		}
576b7579f77SDag-Erling Smørgrav 	}
577b7579f77SDag-Erling Smørgrav 	return 1;
578b7579f77SDag-Erling Smørgrav }
579b7579f77SDag-Erling Smørgrav 
580c7f4d7adSDag-Erling Smørgrav /** see if last resort is possible - does config allow queries to parent */
581c7f4d7adSDag-Erling Smørgrav static int
582c7f4d7adSDag-Erling Smørgrav can_have_last_resort(struct module_env* env, uint8_t* nm, size_t nmlen,
5837da0adf7SDag-Erling Smørgrav 	uint16_t qclass, struct delegpt** retdp)
584c7f4d7adSDag-Erling Smørgrav {
585c7f4d7adSDag-Erling Smørgrav 	struct delegpt* fwddp;
586c7f4d7adSDag-Erling Smørgrav 	struct iter_hints_stub* stub;
587c7f4d7adSDag-Erling Smørgrav 	int labs = dname_count_labels(nm);
588c7f4d7adSDag-Erling Smørgrav 	/* do not process a last resort (the parent side) if a stub
589c7f4d7adSDag-Erling Smørgrav 	 * or forward is configured, because we do not want to go 'above'
590c7f4d7adSDag-Erling Smørgrav 	 * the configured servers */
591c7f4d7adSDag-Erling Smørgrav 	if(!dname_is_root(nm) && (stub = (struct iter_hints_stub*)
592c7f4d7adSDag-Erling Smørgrav 		name_tree_find(&env->hints->tree, nm, nmlen, labs, qclass)) &&
593c7f4d7adSDag-Erling Smørgrav 		/* has_parent side is turned off for stub_first, where we
594c7f4d7adSDag-Erling Smørgrav 		 * are allowed to go to the parent */
595c7f4d7adSDag-Erling Smørgrav 		stub->dp->has_parent_side_NS) {
5967da0adf7SDag-Erling Smørgrav 		if(retdp) *retdp = stub->dp;
597c7f4d7adSDag-Erling Smørgrav 		return 0;
598c7f4d7adSDag-Erling Smørgrav 	}
599c7f4d7adSDag-Erling Smørgrav 	if((fwddp = forwards_find(env->fwds, nm, qclass)) &&
600c7f4d7adSDag-Erling Smørgrav 		/* has_parent_side is turned off for forward_first, where
601c7f4d7adSDag-Erling Smørgrav 		 * we are allowed to go to the parent */
602c7f4d7adSDag-Erling Smørgrav 		fwddp->has_parent_side_NS) {
6037da0adf7SDag-Erling Smørgrav 		if(retdp) *retdp = fwddp;
604c7f4d7adSDag-Erling Smørgrav 		return 0;
605c7f4d7adSDag-Erling Smørgrav 	}
606c7f4d7adSDag-Erling Smørgrav 	return 1;
607c7f4d7adSDag-Erling Smørgrav }
608c7f4d7adSDag-Erling Smørgrav 
60909a3aaf3SDag-Erling Smørgrav /** see if target name is caps-for-id whitelisted */
61009a3aaf3SDag-Erling Smørgrav static int
61109a3aaf3SDag-Erling Smørgrav is_caps_whitelisted(struct iter_env* ie, struct iter_qstate* iq)
61209a3aaf3SDag-Erling Smørgrav {
61309a3aaf3SDag-Erling Smørgrav 	if(!ie->caps_white) return 0; /* no whitelist, or no capsforid */
61409a3aaf3SDag-Erling Smørgrav 	return name_tree_lookup(ie->caps_white, iq->qchase.qname,
61509a3aaf3SDag-Erling Smørgrav 		iq->qchase.qname_len, dname_count_labels(iq->qchase.qname),
61609a3aaf3SDag-Erling Smørgrav 		iq->qchase.qclass) != NULL;
61709a3aaf3SDag-Erling Smørgrav }
61809a3aaf3SDag-Erling Smørgrav 
61952df462fSXin LI /** create target count structure for this query */
62052df462fSXin LI static void
62152df462fSXin LI target_count_create(struct iter_qstate* iq)
62252df462fSXin LI {
62352df462fSXin LI 	if(!iq->target_count) {
62452df462fSXin LI 		iq->target_count = (int*)calloc(2, sizeof(int));
62552df462fSXin LI 		/* if calloc fails we simply do not track this number */
62652df462fSXin LI 		if(iq->target_count)
62752df462fSXin LI 			iq->target_count[0] = 1;
62852df462fSXin LI 	}
62952df462fSXin LI }
63052df462fSXin LI 
63152df462fSXin LI static void
63252df462fSXin LI target_count_increase(struct iter_qstate* iq, int num)
63352df462fSXin LI {
63452df462fSXin LI 	target_count_create(iq);
63552df462fSXin LI 	if(iq->target_count)
63652df462fSXin LI 		iq->target_count[1] += num;
63752df462fSXin LI }
63852df462fSXin LI 
639b7579f77SDag-Erling Smørgrav /**
640b7579f77SDag-Erling Smørgrav  * Generate a subrequest.
641b7579f77SDag-Erling Smørgrav  * Generate a local request event. Local events are tied to this module, and
64205ab2901SDag-Erling Smørgrav  * have a corresponding (first tier) event that is waiting for this event to
643b7579f77SDag-Erling Smørgrav  * resolve to continue.
644b7579f77SDag-Erling Smørgrav  *
645b7579f77SDag-Erling Smørgrav  * @param qname The query name for this request.
646b7579f77SDag-Erling Smørgrav  * @param qnamelen length of qname
647b7579f77SDag-Erling Smørgrav  * @param qtype The query type for this request.
648b7579f77SDag-Erling Smørgrav  * @param qclass The query class for this request.
649b7579f77SDag-Erling Smørgrav  * @param qstate The event that is generating this event.
650b7579f77SDag-Erling Smørgrav  * @param id: module id.
651b7579f77SDag-Erling Smørgrav  * @param iq: The iterator state that is generating this event.
652b7579f77SDag-Erling Smørgrav  * @param initial_state The initial response state (normally this
653b7579f77SDag-Erling Smørgrav  *          is QUERY_RESP_STATE, unless it is known that the request won't
654b7579f77SDag-Erling Smørgrav  *          need iterative processing
655b7579f77SDag-Erling Smørgrav  * @param finalstate The final state for the response to this request.
656b7579f77SDag-Erling Smørgrav  * @param subq_ret: if newly allocated, the subquerystate, or NULL if it does
657b7579f77SDag-Erling Smørgrav  * 	not need initialisation.
658b7579f77SDag-Erling Smørgrav  * @param v: if true, validation is done on the subquery.
659b7579f77SDag-Erling Smørgrav  * @return false on error (malloc).
660b7579f77SDag-Erling Smørgrav  */
661b7579f77SDag-Erling Smørgrav static int
662b7579f77SDag-Erling Smørgrav generate_sub_request(uint8_t* qname, size_t qnamelen, uint16_t qtype,
663b7579f77SDag-Erling Smørgrav 	uint16_t qclass, struct module_qstate* qstate, int id,
664b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq, enum iter_state initial_state,
665b7579f77SDag-Erling Smørgrav 	enum iter_state finalstate, struct module_qstate** subq_ret, int v)
666b7579f77SDag-Erling Smørgrav {
667b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq = NULL;
668b7579f77SDag-Erling Smørgrav 	struct iter_qstate* subiq = NULL;
669b7579f77SDag-Erling Smørgrav 	uint16_t qflags = 0; /* OPCODE QUERY, no flags */
670b7579f77SDag-Erling Smørgrav 	struct query_info qinf;
671b7579f77SDag-Erling Smørgrav 	int prime = (finalstate == PRIME_RESP_STATE)?1:0;
672ff825849SDag-Erling Smørgrav 	int valrec = 0;
673b7579f77SDag-Erling Smørgrav 	qinf.qname = qname;
674b7579f77SDag-Erling Smørgrav 	qinf.qname_len = qnamelen;
675b7579f77SDag-Erling Smørgrav 	qinf.qtype = qtype;
676b7579f77SDag-Erling Smørgrav 	qinf.qclass = qclass;
677bc892140SDag-Erling Smørgrav 	qinf.local_alias = NULL;
678b7579f77SDag-Erling Smørgrav 
679b7579f77SDag-Erling Smørgrav 	/* RD should be set only when sending the query back through the INIT
680b7579f77SDag-Erling Smørgrav 	 * state. */
681b7579f77SDag-Erling Smørgrav 	if(initial_state == INIT_REQUEST_STATE)
682b7579f77SDag-Erling Smørgrav 		qflags |= BIT_RD;
683b7579f77SDag-Erling Smørgrav 	/* We set the CD flag so we can send this through the "head" of
684b7579f77SDag-Erling Smørgrav 	 * the resolution chain, which might have a validator. We are
685b7579f77SDag-Erling Smørgrav 	 * uninterested in validating things not on the direct resolution
686b7579f77SDag-Erling Smørgrav 	 * path.  */
687ff825849SDag-Erling Smørgrav 	if(!v) {
688b7579f77SDag-Erling Smørgrav 		qflags |= BIT_CD;
689ff825849SDag-Erling Smørgrav 		valrec = 1;
690ff825849SDag-Erling Smørgrav 	}
691b7579f77SDag-Erling Smørgrav 
692b7579f77SDag-Erling Smørgrav 	/* attach subquery, lookup existing or make a new one */
693b7579f77SDag-Erling Smørgrav 	fptr_ok(fptr_whitelist_modenv_attach_sub(qstate->env->attach_sub));
694ff825849SDag-Erling Smørgrav 	if(!(*qstate->env->attach_sub)(qstate, &qinf, qflags, prime, valrec,
695ff825849SDag-Erling Smørgrav 		&subq)) {
696b7579f77SDag-Erling Smørgrav 		return 0;
697b7579f77SDag-Erling Smørgrav 	}
698b7579f77SDag-Erling Smørgrav 	*subq_ret = subq;
699b7579f77SDag-Erling Smørgrav 	if(subq) {
700b7579f77SDag-Erling Smørgrav 		/* initialise the new subquery */
701b7579f77SDag-Erling Smørgrav 		subq->curmod = id;
702b7579f77SDag-Erling Smørgrav 		subq->ext_state[id] = module_state_initial;
703b7579f77SDag-Erling Smørgrav 		subq->minfo[id] = regional_alloc(subq->region,
704b7579f77SDag-Erling Smørgrav 			sizeof(struct iter_qstate));
705b7579f77SDag-Erling Smørgrav 		if(!subq->minfo[id]) {
706b7579f77SDag-Erling Smørgrav 			log_err("init subq: out of memory");
707b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
708b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
709b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
710b7579f77SDag-Erling Smørgrav 			return 0;
711b7579f77SDag-Erling Smørgrav 		}
712b7579f77SDag-Erling Smørgrav 		subiq = (struct iter_qstate*)subq->minfo[id];
713b7579f77SDag-Erling Smørgrav 		memset(subiq, 0, sizeof(*subiq));
714b7579f77SDag-Erling Smørgrav 		subiq->num_target_queries = 0;
71552df462fSXin LI 		target_count_create(iq);
71652df462fSXin LI 		subiq->target_count = iq->target_count;
71752df462fSXin LI 		if(iq->target_count)
71852df462fSXin LI 			iq->target_count[0] ++; /* extra reference */
719b7579f77SDag-Erling Smørgrav 		subiq->num_current_queries = 0;
720b7579f77SDag-Erling Smørgrav 		subiq->depth = iq->depth+1;
721b7579f77SDag-Erling Smørgrav 		outbound_list_init(&subiq->outlist);
722b7579f77SDag-Erling Smørgrav 		subiq->state = initial_state;
723b7579f77SDag-Erling Smørgrav 		subiq->final_state = finalstate;
724b7579f77SDag-Erling Smørgrav 		subiq->qchase = subq->qinfo;
725b7579f77SDag-Erling Smørgrav 		subiq->chase_flags = subq->query_flags;
726b7579f77SDag-Erling Smørgrav 		subiq->refetch_glue = 0;
72705ab2901SDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation)
72805ab2901SDag-Erling Smørgrav 			subiq->minimisation_state = INIT_MINIMISE_STATE;
72905ab2901SDag-Erling Smørgrav 		else
73005ab2901SDag-Erling Smørgrav 			subiq->minimisation_state = DONOT_MINIMISE_STATE;
73105ab2901SDag-Erling Smørgrav 		memset(&subiq->qinfo_out, 0, sizeof(struct query_info));
732b7579f77SDag-Erling Smørgrav 	}
733b7579f77SDag-Erling Smørgrav 	return 1;
734b7579f77SDag-Erling Smørgrav }
735b7579f77SDag-Erling Smørgrav 
736b7579f77SDag-Erling Smørgrav /**
737b7579f77SDag-Erling Smørgrav  * Generate and send a root priming request.
738b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
739b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
740b7579f77SDag-Erling Smørgrav  * @param id: module id.
741b7579f77SDag-Erling Smørgrav  * @param qclass: the class to prime.
742b7579f77SDag-Erling Smørgrav  * @return 0 on failure
743b7579f77SDag-Erling Smørgrav  */
744b7579f77SDag-Erling Smørgrav static int
745b7579f77SDag-Erling Smørgrav prime_root(struct module_qstate* qstate, struct iter_qstate* iq, int id,
746b7579f77SDag-Erling Smørgrav 	uint16_t qclass)
747b7579f77SDag-Erling Smørgrav {
748b7579f77SDag-Erling Smørgrav 	struct delegpt* dp;
749b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
750b7579f77SDag-Erling Smørgrav 	verbose(VERB_DETAIL, "priming . %s NS",
75117d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rr_classes, (int)qclass)?
75217d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rr_classes, (int)qclass)->name:"??");
753b7579f77SDag-Erling Smørgrav 	dp = hints_lookup_root(qstate->env->hints, qclass);
754b7579f77SDag-Erling Smørgrav 	if(!dp) {
755b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "Cannot prime due to lack of hints");
756b7579f77SDag-Erling Smørgrav 		return 0;
757b7579f77SDag-Erling Smørgrav 	}
758b7579f77SDag-Erling Smørgrav 	/* Priming requests start at the QUERYTARGETS state, skipping
759b7579f77SDag-Erling Smørgrav 	 * the normal INIT state logic (which would cause an infloop). */
760b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request((uint8_t*)"\000", 1, LDNS_RR_TYPE_NS,
761b7579f77SDag-Erling Smørgrav 		qclass, qstate, id, iq, QUERYTARGETS_STATE, PRIME_RESP_STATE,
762b7579f77SDag-Erling Smørgrav 		&subq, 0)) {
763b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not prime root");
764b7579f77SDag-Erling Smørgrav 		return 0;
765b7579f77SDag-Erling Smørgrav 	}
766b7579f77SDag-Erling Smørgrav 	if(subq) {
767b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
768b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
769b7579f77SDag-Erling Smørgrav 		/* Set the initial delegation point to the hint.
770b7579f77SDag-Erling Smørgrav 		 * copy dp, it is now part of the root prime query.
771b7579f77SDag-Erling Smørgrav 		 * dp was part of in the fixed hints structure. */
772b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(dp, subq->region);
773b7579f77SDag-Erling Smørgrav 		if(!subiq->dp) {
774b7579f77SDag-Erling Smørgrav 			log_err("out of memory priming root, copydp");
775b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
776b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
777b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
778b7579f77SDag-Erling Smørgrav 			return 0;
779b7579f77SDag-Erling Smørgrav 		}
780b7579f77SDag-Erling Smørgrav 		/* there should not be any target queries. */
781b7579f77SDag-Erling Smørgrav 		subiq->num_target_queries = 0;
782b7579f77SDag-Erling Smørgrav 		subiq->dnssec_expected = iter_indicates_dnssec(
783b7579f77SDag-Erling Smørgrav 			qstate->env, subiq->dp, NULL, subq->qinfo.qclass);
784b7579f77SDag-Erling Smørgrav 	}
785b7579f77SDag-Erling Smørgrav 
786b7579f77SDag-Erling Smørgrav 	/* this module stops, our submodule starts, and does the query. */
787b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_wait_subquery;
788b7579f77SDag-Erling Smørgrav 	return 1;
789b7579f77SDag-Erling Smørgrav }
790b7579f77SDag-Erling Smørgrav 
791b7579f77SDag-Erling Smørgrav /**
792b7579f77SDag-Erling Smørgrav  * Generate and process a stub priming request. This method tests for the
793b7579f77SDag-Erling Smørgrav  * need to prime a stub zone, so it is safe to call for every request.
794b7579f77SDag-Erling Smørgrav  *
795b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
796b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
797b7579f77SDag-Erling Smørgrav  * @param id: module id.
798b7579f77SDag-Erling Smørgrav  * @param qname: request name.
799b7579f77SDag-Erling Smørgrav  * @param qclass: request class.
800b7579f77SDag-Erling Smørgrav  * @return true if a priming subrequest was made, false if not. The will only
801b7579f77SDag-Erling Smørgrav  *         issue a priming request if it detects an unprimed stub.
802b7579f77SDag-Erling Smørgrav  *         Uses value of 2 to signal during stub-prime in root-prime situation
803b7579f77SDag-Erling Smørgrav  *         that a noprime-stub is available and resolution can continue.
804b7579f77SDag-Erling Smørgrav  */
805b7579f77SDag-Erling Smørgrav static int
806b7579f77SDag-Erling Smørgrav prime_stub(struct module_qstate* qstate, struct iter_qstate* iq, int id,
807b7579f77SDag-Erling Smørgrav 	uint8_t* qname, uint16_t qclass)
808b7579f77SDag-Erling Smørgrav {
809b7579f77SDag-Erling Smørgrav 	/* Lookup the stub hint. This will return null if the stub doesn't
810b7579f77SDag-Erling Smørgrav 	 * need to be re-primed. */
811b7579f77SDag-Erling Smørgrav 	struct iter_hints_stub* stub;
812b7579f77SDag-Erling Smørgrav 	struct delegpt* stub_dp;
813b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
814b7579f77SDag-Erling Smørgrav 
815b7579f77SDag-Erling Smørgrav 	if(!qname) return 0;
816b7579f77SDag-Erling Smørgrav 	stub = hints_lookup_stub(qstate->env->hints, qname, qclass, iq->dp);
817b7579f77SDag-Erling Smørgrav 	/* The stub (if there is one) does not need priming. */
818b7579f77SDag-Erling Smørgrav 	if(!stub)
819b7579f77SDag-Erling Smørgrav 		return 0;
820b7579f77SDag-Erling Smørgrav 	stub_dp = stub->dp;
82157bddd21SDag-Erling Smørgrav 	/* if we have an auth_zone dp, and stub is equal, don't prime stub
82257bddd21SDag-Erling Smørgrav 	 * yet, unless we want to fallback and avoid the auth_zone */
82357bddd21SDag-Erling Smørgrav 	if(!iq->auth_zone_avoid && iq->dp && iq->dp->auth_dp &&
82457bddd21SDag-Erling Smørgrav 		query_dname_compare(iq->dp->name, stub_dp->name) == 0)
82557bddd21SDag-Erling Smørgrav 		return 0;
826b7579f77SDag-Erling Smørgrav 
827b7579f77SDag-Erling Smørgrav 	/* is it a noprime stub (always use) */
828b7579f77SDag-Erling Smørgrav 	if(stub->noprime) {
829b7579f77SDag-Erling Smørgrav 		int r = 0;
830b7579f77SDag-Erling Smørgrav 		if(iq->dp == NULL) r = 2;
831b7579f77SDag-Erling Smørgrav 		/* copy the dp out of the fixed hints structure, so that
832b7579f77SDag-Erling Smørgrav 		 * it can be changed when servicing this query */
833b7579f77SDag-Erling Smørgrav 		iq->dp = delegpt_copy(stub_dp, qstate->region);
834b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
835b7579f77SDag-Erling Smørgrav 			log_err("out of memory priming stub");
8364c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, priming stub");
837b7579f77SDag-Erling Smørgrav 			(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
838b7579f77SDag-Erling Smørgrav 			return 1; /* return 1 to make module stop, with error */
839b7579f77SDag-Erling Smørgrav 		}
840b7579f77SDag-Erling Smørgrav 		log_nametypeclass(VERB_DETAIL, "use stub", stub_dp->name,
841b7579f77SDag-Erling Smørgrav 			LDNS_RR_TYPE_NS, qclass);
842b7579f77SDag-Erling Smørgrav 		return r;
843b7579f77SDag-Erling Smørgrav 	}
844b7579f77SDag-Erling Smørgrav 
845b7579f77SDag-Erling Smørgrav 	/* Otherwise, we need to (re)prime the stub. */
846b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_DETAIL, "priming stub", stub_dp->name,
847b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, qclass);
848b7579f77SDag-Erling Smørgrav 
849b7579f77SDag-Erling Smørgrav 	/* Stub priming events start at the QUERYTARGETS state to avoid the
850b7579f77SDag-Erling Smørgrav 	 * redundant INIT state processing. */
851b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(stub_dp->name, stub_dp->namelen,
852b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, qclass, qstate, id, iq,
853b7579f77SDag-Erling Smørgrav 		QUERYTARGETS_STATE, PRIME_RESP_STATE, &subq, 0)) {
854b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not prime stub");
8554c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "could not generate lookup for stub prime");
856b7579f77SDag-Erling Smørgrav 		(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
857b7579f77SDag-Erling Smørgrav 		return 1; /* return 1 to make module stop, with error */
858b7579f77SDag-Erling Smørgrav 	}
859b7579f77SDag-Erling Smørgrav 	if(subq) {
860b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
861b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
862b7579f77SDag-Erling Smørgrav 
863b7579f77SDag-Erling Smørgrav 		/* Set the initial delegation point to the hint. */
864b7579f77SDag-Erling Smørgrav 		/* make copy to avoid use of stub dp by different qs/threads */
865b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(stub_dp, subq->region);
866b7579f77SDag-Erling Smørgrav 		if(!subiq->dp) {
867b7579f77SDag-Erling Smørgrav 			log_err("out of memory priming stub, copydp");
868b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
869b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
870b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
8714c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, in stub prime");
872b7579f77SDag-Erling Smørgrav 			(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
873b7579f77SDag-Erling Smørgrav 			return 1; /* return 1 to make module stop, with error */
874b7579f77SDag-Erling Smørgrav 		}
875b7579f77SDag-Erling Smørgrav 		/* there should not be any target queries -- although there
876b7579f77SDag-Erling Smørgrav 		 * wouldn't be anyway, since stub hints never have
877b7579f77SDag-Erling Smørgrav 		 * missing targets. */
878b7579f77SDag-Erling Smørgrav 		subiq->num_target_queries = 0;
879b7579f77SDag-Erling Smørgrav 		subiq->wait_priming_stub = 1;
880b7579f77SDag-Erling Smørgrav 		subiq->dnssec_expected = iter_indicates_dnssec(
881b7579f77SDag-Erling Smørgrav 			qstate->env, subiq->dp, NULL, subq->qinfo.qclass);
882b7579f77SDag-Erling Smørgrav 	}
883b7579f77SDag-Erling Smørgrav 
884b7579f77SDag-Erling Smørgrav 	/* this module stops, our submodule starts, and does the query. */
885b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_wait_subquery;
886b7579f77SDag-Erling Smørgrav 	return 1;
887b7579f77SDag-Erling Smørgrav }
888b7579f77SDag-Erling Smørgrav 
889b7579f77SDag-Erling Smørgrav /**
89057bddd21SDag-Erling Smørgrav  * Generate a delegation point for an auth zone (unless cached dp is better)
89157bddd21SDag-Erling Smørgrav  * false on alloc failure.
89257bddd21SDag-Erling Smørgrav  */
89357bddd21SDag-Erling Smørgrav static int
89457bddd21SDag-Erling Smørgrav auth_zone_delegpt(struct module_qstate* qstate, struct iter_qstate* iq,
89557bddd21SDag-Erling Smørgrav 	uint8_t* delname, size_t delnamelen)
89657bddd21SDag-Erling Smørgrav {
89757bddd21SDag-Erling Smørgrav 	struct auth_zone* z;
89857bddd21SDag-Erling Smørgrav 	if(iq->auth_zone_avoid)
89957bddd21SDag-Erling Smørgrav 		return 1;
90057bddd21SDag-Erling Smørgrav 	if(!delname) {
90157bddd21SDag-Erling Smørgrav 		delname = iq->qchase.qname;
90257bddd21SDag-Erling Smørgrav 		delnamelen = iq->qchase.qname_len;
90357bddd21SDag-Erling Smørgrav 	}
90457bddd21SDag-Erling Smørgrav 	lock_rw_rdlock(&qstate->env->auth_zones->lock);
90557bddd21SDag-Erling Smørgrav 	z = auth_zones_find_zone(qstate->env->auth_zones, delname, delnamelen,
90657bddd21SDag-Erling Smørgrav 		qstate->qinfo.qclass);
90757bddd21SDag-Erling Smørgrav 	if(!z) {
90857bddd21SDag-Erling Smørgrav 		lock_rw_unlock(&qstate->env->auth_zones->lock);
90957bddd21SDag-Erling Smørgrav 		return 1;
91057bddd21SDag-Erling Smørgrav 	}
91157bddd21SDag-Erling Smørgrav 	lock_rw_rdlock(&z->lock);
91257bddd21SDag-Erling Smørgrav 	lock_rw_unlock(&qstate->env->auth_zones->lock);
91357bddd21SDag-Erling Smørgrav 	if(z->for_upstream) {
91457bddd21SDag-Erling Smørgrav 		if(iq->dp && query_dname_compare(z->name, iq->dp->name) == 0
91557bddd21SDag-Erling Smørgrav 			&& iq->dp->auth_dp && qstate->blacklist &&
91657bddd21SDag-Erling Smørgrav 			z->fallback_enabled) {
91757bddd21SDag-Erling Smørgrav 			/* cache is blacklisted and fallback, and we
91857bddd21SDag-Erling Smørgrav 			 * already have an auth_zone dp */
91957bddd21SDag-Erling Smørgrav 			if(verbosity>=VERB_ALGO) {
92057bddd21SDag-Erling Smørgrav 				char buf[255+1];
92157bddd21SDag-Erling Smørgrav 				dname_str(z->name, buf);
92257bddd21SDag-Erling Smørgrav 				verbose(VERB_ALGO, "auth_zone %s "
92357bddd21SDag-Erling Smørgrav 				  "fallback because cache blacklisted",
92457bddd21SDag-Erling Smørgrav 				  buf);
92557bddd21SDag-Erling Smørgrav 			}
92657bddd21SDag-Erling Smørgrav 			lock_rw_unlock(&z->lock);
92757bddd21SDag-Erling Smørgrav 			iq->dp = NULL;
92857bddd21SDag-Erling Smørgrav 			return 1;
92957bddd21SDag-Erling Smørgrav 		}
93057bddd21SDag-Erling Smørgrav 		if(iq->dp==NULL || dname_subdomain_c(z->name, iq->dp->name)) {
93157bddd21SDag-Erling Smørgrav 			struct delegpt* dp;
93257bddd21SDag-Erling Smørgrav 			if(qstate->blacklist && z->fallback_enabled) {
93357bddd21SDag-Erling Smørgrav 				/* cache is blacklisted because of a DNSSEC
93457bddd21SDag-Erling Smørgrav 				 * validation failure, and the zone allows
93557bddd21SDag-Erling Smørgrav 				 * fallback to the internet, query there. */
93657bddd21SDag-Erling Smørgrav 				if(verbosity>=VERB_ALGO) {
93757bddd21SDag-Erling Smørgrav 					char buf[255+1];
93857bddd21SDag-Erling Smørgrav 					dname_str(z->name, buf);
93957bddd21SDag-Erling Smørgrav 					verbose(VERB_ALGO, "auth_zone %s "
94057bddd21SDag-Erling Smørgrav 					  "fallback because cache blacklisted",
94157bddd21SDag-Erling Smørgrav 					  buf);
94257bddd21SDag-Erling Smørgrav 				}
94357bddd21SDag-Erling Smørgrav 				lock_rw_unlock(&z->lock);
94457bddd21SDag-Erling Smørgrav 				return 1;
94557bddd21SDag-Erling Smørgrav 			}
94657bddd21SDag-Erling Smørgrav 			dp = (struct delegpt*)regional_alloc_zero(
94757bddd21SDag-Erling Smørgrav 				qstate->region, sizeof(*dp));
94857bddd21SDag-Erling Smørgrav 			if(!dp) {
94957bddd21SDag-Erling Smørgrav 				log_err("alloc failure");
95057bddd21SDag-Erling Smørgrav 				if(z->fallback_enabled) {
95157bddd21SDag-Erling Smørgrav 					lock_rw_unlock(&z->lock);
95257bddd21SDag-Erling Smørgrav 					return 1; /* just fallback */
95357bddd21SDag-Erling Smørgrav 				}
95457bddd21SDag-Erling Smørgrav 				lock_rw_unlock(&z->lock);
9554c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "malloc failure");
95657bddd21SDag-Erling Smørgrav 				return 0;
95757bddd21SDag-Erling Smørgrav 			}
95857bddd21SDag-Erling Smørgrav 			dp->name = regional_alloc_init(qstate->region,
95957bddd21SDag-Erling Smørgrav 				z->name, z->namelen);
96057bddd21SDag-Erling Smørgrav 			if(!dp->name) {
96157bddd21SDag-Erling Smørgrav 				log_err("alloc failure");
96257bddd21SDag-Erling Smørgrav 				if(z->fallback_enabled) {
96357bddd21SDag-Erling Smørgrav 					lock_rw_unlock(&z->lock);
96457bddd21SDag-Erling Smørgrav 					return 1; /* just fallback */
96557bddd21SDag-Erling Smørgrav 				}
96657bddd21SDag-Erling Smørgrav 				lock_rw_unlock(&z->lock);
9674c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "malloc failure");
96857bddd21SDag-Erling Smørgrav 				return 0;
96957bddd21SDag-Erling Smørgrav 			}
97057bddd21SDag-Erling Smørgrav 			dp->namelen = z->namelen;
97157bddd21SDag-Erling Smørgrav 			dp->namelabs = z->namelabs;
97257bddd21SDag-Erling Smørgrav 			dp->auth_dp = 1;
97357bddd21SDag-Erling Smørgrav 			iq->dp = dp;
97457bddd21SDag-Erling Smørgrav 		}
97557bddd21SDag-Erling Smørgrav 	}
97657bddd21SDag-Erling Smørgrav 
97757bddd21SDag-Erling Smørgrav 	lock_rw_unlock(&z->lock);
97857bddd21SDag-Erling Smørgrav 	return 1;
97957bddd21SDag-Erling Smørgrav }
98057bddd21SDag-Erling Smørgrav 
98157bddd21SDag-Erling Smørgrav /**
982b7579f77SDag-Erling Smørgrav  * Generate A and AAAA checks for glue that is in-zone for the referral
9838a384985SDag-Erling Smørgrav  * we just got to obtain authoritative information on the addresses.
984b7579f77SDag-Erling Smørgrav  *
985b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
986b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
987b7579f77SDag-Erling Smørgrav  * @param id: module id.
988b7579f77SDag-Erling Smørgrav  */
989b7579f77SDag-Erling Smørgrav static void
990b7579f77SDag-Erling Smørgrav generate_a_aaaa_check(struct module_qstate* qstate, struct iter_qstate* iq,
991b7579f77SDag-Erling Smørgrav 	int id)
992b7579f77SDag-Erling Smørgrav {
993b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
994b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
995b7579f77SDag-Erling Smørgrav 	size_t i;
996b7579f77SDag-Erling Smørgrav 	struct reply_info* rep = iq->response->rep;
997b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* s;
998b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
999b7579f77SDag-Erling Smørgrav 
1000b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth)
1001b7579f77SDag-Erling Smørgrav 		return;
1002b7579f77SDag-Erling Smørgrav 	/* walk through additional, and check if in-zone,
1003b7579f77SDag-Erling Smørgrav 	 * only relevant A, AAAA are left after scrub anyway */
1004b7579f77SDag-Erling Smørgrav 	for(i=rep->an_numrrsets+rep->ns_numrrsets; i<rep->rrset_count; i++) {
1005b7579f77SDag-Erling Smørgrav 		s = rep->rrsets[i];
1006b7579f77SDag-Erling Smørgrav 		/* check *ALL* addresses that are transmitted in additional*/
1007b7579f77SDag-Erling Smørgrav 		/* is it an address ? */
1008b7579f77SDag-Erling Smørgrav 		if( !(ntohs(s->rk.type)==LDNS_RR_TYPE_A ||
1009b7579f77SDag-Erling Smørgrav 			ntohs(s->rk.type)==LDNS_RR_TYPE_AAAA)) {
1010b7579f77SDag-Erling Smørgrav 			continue;
1011b7579f77SDag-Erling Smørgrav 		}
1012b7579f77SDag-Erling Smørgrav 		/* is this query the same as the A/AAAA check for it */
1013b7579f77SDag-Erling Smørgrav 		if(qstate->qinfo.qtype == ntohs(s->rk.type) &&
1014b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qclass == ntohs(s->rk.rrset_class) &&
1015b7579f77SDag-Erling Smørgrav 			query_dname_compare(qstate->qinfo.qname,
1016b7579f77SDag-Erling Smørgrav 				s->rk.dname)==0 &&
1017b7579f77SDag-Erling Smørgrav 			(qstate->query_flags&BIT_RD) &&
1018b7579f77SDag-Erling Smørgrav 			!(qstate->query_flags&BIT_CD))
1019b7579f77SDag-Erling Smørgrav 			continue;
1020b7579f77SDag-Erling Smørgrav 
1021b7579f77SDag-Erling Smørgrav 		/* generate subrequest for it */
1022b7579f77SDag-Erling Smørgrav 		log_nametypeclass(VERB_ALGO, "schedule addr fetch",
1023b7579f77SDag-Erling Smørgrav 			s->rk.dname, ntohs(s->rk.type),
1024b7579f77SDag-Erling Smørgrav 			ntohs(s->rk.rrset_class));
1025b7579f77SDag-Erling Smørgrav 		if(!generate_sub_request(s->rk.dname, s->rk.dname_len,
1026b7579f77SDag-Erling Smørgrav 			ntohs(s->rk.type), ntohs(s->rk.rrset_class),
1027b7579f77SDag-Erling Smørgrav 			qstate, id, iq,
1028b7579f77SDag-Erling Smørgrav 			INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1)) {
1029b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "could not generate addr check");
1030b7579f77SDag-Erling Smørgrav 			return;
1031b7579f77SDag-Erling Smørgrav 		}
1032b7579f77SDag-Erling Smørgrav 		/* ignore subq - not need for more init */
1033b7579f77SDag-Erling Smørgrav 	}
1034b7579f77SDag-Erling Smørgrav }
1035b7579f77SDag-Erling Smørgrav 
1036b7579f77SDag-Erling Smørgrav /**
1037b7579f77SDag-Erling Smørgrav  * Generate a NS check request to obtain authoritative information
1038b7579f77SDag-Erling Smørgrav  * on an NS rrset.
1039b7579f77SDag-Erling Smørgrav  *
1040b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
1041b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1042b7579f77SDag-Erling Smørgrav  * @param id: module id.
1043b7579f77SDag-Erling Smørgrav  */
1044b7579f77SDag-Erling Smørgrav static void
1045b7579f77SDag-Erling Smørgrav generate_ns_check(struct module_qstate* qstate, struct iter_qstate* iq, int id)
1046b7579f77SDag-Erling Smørgrav {
1047b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
1048b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1049b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
1050b7579f77SDag-Erling Smørgrav 
1051b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth)
1052b7579f77SDag-Erling Smørgrav 		return;
1053c7f4d7adSDag-Erling Smørgrav 	if(!can_have_last_resort(qstate->env, iq->dp->name, iq->dp->namelen,
10547da0adf7SDag-Erling Smørgrav 		iq->qchase.qclass, NULL))
1055c7f4d7adSDag-Erling Smørgrav 		return;
1056b7579f77SDag-Erling Smørgrav 	/* is this query the same as the nscheck? */
1057b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_NS &&
1058b7579f77SDag-Erling Smørgrav 		query_dname_compare(iq->dp->name, qstate->qinfo.qname)==0 &&
1059b7579f77SDag-Erling Smørgrav 		(qstate->query_flags&BIT_RD) && !(qstate->query_flags&BIT_CD)){
1060b7579f77SDag-Erling Smørgrav 		/* spawn off A, AAAA queries for in-zone glue to check */
1061b7579f77SDag-Erling Smørgrav 		generate_a_aaaa_check(qstate, iq, id);
1062b7579f77SDag-Erling Smørgrav 		return;
1063b7579f77SDag-Erling Smørgrav 	}
106457bddd21SDag-Erling Smørgrav 	/* no need to get the NS record for DS, it is above the zonecut */
106557bddd21SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_DS)
106657bddd21SDag-Erling Smørgrav 		return;
1067b7579f77SDag-Erling Smørgrav 
1068b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_ALGO, "schedule ns fetch",
1069b7579f77SDag-Erling Smørgrav 		iq->dp->name, LDNS_RR_TYPE_NS, iq->qchase.qclass);
1070b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(iq->dp->name, iq->dp->namelen,
1071b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, iq->qchase.qclass, qstate, id, iq,
1072b7579f77SDag-Erling Smørgrav 		INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1)) {
1073b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not generate ns check");
1074b7579f77SDag-Erling Smørgrav 		return;
1075b7579f77SDag-Erling Smørgrav 	}
1076b7579f77SDag-Erling Smørgrav 	if(subq) {
1077b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
1078b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
1079b7579f77SDag-Erling Smørgrav 
1080b7579f77SDag-Erling Smørgrav 		/* make copy to avoid use of stub dp by different qs/threads */
1081b7579f77SDag-Erling Smørgrav 		/* refetch glue to start higher up the tree */
1082b7579f77SDag-Erling Smørgrav 		subiq->refetch_glue = 1;
1083b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(iq->dp, subq->region);
1084b7579f77SDag-Erling Smørgrav 		if(!subiq->dp) {
1085b7579f77SDag-Erling Smørgrav 			log_err("out of memory generating ns check, copydp");
1086b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
1087b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
1088b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
1089b7579f77SDag-Erling Smørgrav 			return;
1090b7579f77SDag-Erling Smørgrav 		}
1091b7579f77SDag-Erling Smørgrav 	}
1092b7579f77SDag-Erling Smørgrav }
1093b7579f77SDag-Erling Smørgrav 
1094b7579f77SDag-Erling Smørgrav /**
1095b7579f77SDag-Erling Smørgrav  * Generate a DNSKEY prefetch query to get the DNSKEY for the DS record we
1096b7579f77SDag-Erling Smørgrav  * just got in a referral (where we have dnssec_expected, thus have trust
1097b7579f77SDag-Erling Smørgrav  * anchors above it).  Note that right after calling this routine the
1098b7579f77SDag-Erling Smørgrav  * iterator detached subqueries (because of following the referral), and thus
1099b7579f77SDag-Erling Smørgrav  * the DNSKEY query becomes detached, its return stored in the cache for
1100b7579f77SDag-Erling Smørgrav  * later lookup by the validator.  This cache lookup by the validator avoids
1101b7579f77SDag-Erling Smørgrav  * the roundtrip incurred by the DNSKEY query.  The DNSKEY query is now
1102b7579f77SDag-Erling Smørgrav  * performed at about the same time the original query is sent to the domain,
1103b7579f77SDag-Erling Smørgrav  * thus the two answers are likely to be returned at about the same time,
1104b7579f77SDag-Erling Smørgrav  * saving a roundtrip from the validated lookup.
1105b7579f77SDag-Erling Smørgrav  *
1106b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
1107b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1108b7579f77SDag-Erling Smørgrav  * @param id: module id.
1109b7579f77SDag-Erling Smørgrav  */
1110b7579f77SDag-Erling Smørgrav static void
1111b7579f77SDag-Erling Smørgrav generate_dnskey_prefetch(struct module_qstate* qstate,
1112b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq, int id)
1113b7579f77SDag-Erling Smørgrav {
1114b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1115b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
1116b7579f77SDag-Erling Smørgrav 
1117b7579f77SDag-Erling Smørgrav 	/* is this query the same as the prefetch? */
1118b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_DNSKEY &&
1119b7579f77SDag-Erling Smørgrav 		query_dname_compare(iq->dp->name, qstate->qinfo.qname)==0 &&
1120b7579f77SDag-Erling Smørgrav 		(qstate->query_flags&BIT_RD) && !(qstate->query_flags&BIT_CD)){
1121b7579f77SDag-Erling Smørgrav 		return;
1122b7579f77SDag-Erling Smørgrav 	}
1123b7579f77SDag-Erling Smørgrav 
1124b7579f77SDag-Erling Smørgrav 	/* if the DNSKEY is in the cache this lookup will stop quickly */
1125b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_ALGO, "schedule dnskey prefetch",
1126b7579f77SDag-Erling Smørgrav 		iq->dp->name, LDNS_RR_TYPE_DNSKEY, iq->qchase.qclass);
1127b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(iq->dp->name, iq->dp->namelen,
1128b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_DNSKEY, iq->qchase.qclass, qstate, id, iq,
1129b7579f77SDag-Erling Smørgrav 		INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0)) {
1130b7579f77SDag-Erling Smørgrav 		/* we'll be slower, but it'll work */
1131b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not generate dnskey prefetch");
1132b7579f77SDag-Erling Smørgrav 		return;
1133b7579f77SDag-Erling Smørgrav 	}
1134b7579f77SDag-Erling Smørgrav 	if(subq) {
1135b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
1136b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
1137b7579f77SDag-Erling Smørgrav 		/* this qstate has the right delegation for the dnskey lookup*/
1138b7579f77SDag-Erling Smørgrav 		/* make copy to avoid use of stub dp by different qs/threads */
1139b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(iq->dp, subq->region);
1140b7579f77SDag-Erling Smørgrav 		/* if !subiq->dp, it'll start from the cache, no problem */
1141b7579f77SDag-Erling Smørgrav 	}
1142b7579f77SDag-Erling Smørgrav }
1143b7579f77SDag-Erling Smørgrav 
1144b7579f77SDag-Erling Smørgrav /**
1145b7579f77SDag-Erling Smørgrav  * See if the query needs forwarding.
1146b7579f77SDag-Erling Smørgrav  *
1147b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1148b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1149b7579f77SDag-Erling Smørgrav  * @return true if the request is forwarded, false if not.
1150b7579f77SDag-Erling Smørgrav  * 	If returns true but, iq->dp is NULL then a malloc failure occurred.
1151b7579f77SDag-Erling Smørgrav  */
1152b7579f77SDag-Erling Smørgrav static int
1153b7579f77SDag-Erling Smørgrav forward_request(struct module_qstate* qstate, struct iter_qstate* iq)
1154b7579f77SDag-Erling Smørgrav {
1155b7579f77SDag-Erling Smørgrav 	struct delegpt* dp;
1156b7579f77SDag-Erling Smørgrav 	uint8_t* delname = iq->qchase.qname;
1157b7579f77SDag-Erling Smørgrav 	size_t delnamelen = iq->qchase.qname_len;
1158a755b6f6SDag-Erling Smørgrav 	if(iq->refetch_glue && iq->dp) {
1159b7579f77SDag-Erling Smørgrav 		delname = iq->dp->name;
1160b7579f77SDag-Erling Smørgrav 		delnamelen = iq->dp->namelen;
1161b7579f77SDag-Erling Smørgrav 	}
1162b7579f77SDag-Erling Smørgrav 	/* strip one label off of DS query to lookup higher for it */
1163b7579f77SDag-Erling Smørgrav 	if( (iq->qchase.qtype == LDNS_RR_TYPE_DS || iq->refetch_glue)
1164b7579f77SDag-Erling Smørgrav 		&& !dname_is_root(iq->qchase.qname))
1165b7579f77SDag-Erling Smørgrav 		dname_remove_label(&delname, &delnamelen);
1166b7579f77SDag-Erling Smørgrav 	dp = forwards_lookup(qstate->env->fwds, delname, iq->qchase.qclass);
1167b7579f77SDag-Erling Smørgrav 	if(!dp)
1168b7579f77SDag-Erling Smørgrav 		return 0;
1169b7579f77SDag-Erling Smørgrav 	/* send recursion desired to forward addr */
1170b7579f77SDag-Erling Smørgrav 	iq->chase_flags |= BIT_RD;
1171b7579f77SDag-Erling Smørgrav 	iq->dp = delegpt_copy(dp, qstate->region);
1172b7579f77SDag-Erling Smørgrav 	/* iq->dp checked by caller */
1173b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "forwarding request");
1174b7579f77SDag-Erling Smørgrav 	return 1;
1175b7579f77SDag-Erling Smørgrav }
1176b7579f77SDag-Erling Smørgrav 
1177b7579f77SDag-Erling Smørgrav /**
1178b7579f77SDag-Erling Smørgrav  * Process the initial part of the request handling. This state roughly
1179b7579f77SDag-Erling Smørgrav  * corresponds to resolver algorithms steps 1 (find answer in cache) and 2
1180b7579f77SDag-Erling Smørgrav  * (find the best servers to ask).
1181b7579f77SDag-Erling Smørgrav  *
1182b7579f77SDag-Erling Smørgrav  * Note that all requests start here, and query restarts revisit this state.
1183b7579f77SDag-Erling Smørgrav  *
1184b7579f77SDag-Erling Smørgrav  * This state either generates: 1) a response, from cache or error, 2) a
1185b7579f77SDag-Erling Smørgrav  * priming event, or 3) forwards the request to the next state (init2,
1186b7579f77SDag-Erling Smørgrav  * generally).
1187b7579f77SDag-Erling Smørgrav  *
1188b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1189b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1190b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
1191b7579f77SDag-Erling Smørgrav  * @param id: module id.
1192b7579f77SDag-Erling Smørgrav  * @return true if the event needs more request processing immediately,
1193b7579f77SDag-Erling Smørgrav  *         false if not.
1194b7579f77SDag-Erling Smørgrav  */
1195b7579f77SDag-Erling Smørgrav static int
1196b7579f77SDag-Erling Smørgrav processInitRequest(struct module_qstate* qstate, struct iter_qstate* iq,
1197b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
1198b7579f77SDag-Erling Smørgrav {
1199b7579f77SDag-Erling Smørgrav 	uint8_t* delname;
1200b7579f77SDag-Erling Smørgrav 	size_t delnamelen;
1201bc892140SDag-Erling Smørgrav 	struct dns_msg* msg = NULL;
1202b7579f77SDag-Erling Smørgrav 
1203b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_DETAIL, "resolving", &qstate->qinfo);
1204b7579f77SDag-Erling Smørgrav 	/* check effort */
1205b7579f77SDag-Erling Smørgrav 
1206b7579f77SDag-Erling Smørgrav 	/* We enforce a maximum number of query restarts. This is primarily a
1207b7579f77SDag-Erling Smørgrav 	 * cheap way to prevent CNAME loops. */
1208b7579f77SDag-Erling Smørgrav 	if(iq->query_restart_count > MAX_RESTART_COUNT) {
1209b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum number"
1210b7579f77SDag-Erling Smørgrav 			" of query restarts with %d", iq->query_restart_count);
12114c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "request has exceeded the maximum number "
12124c75e3aaSDag-Erling Smørgrav 			"restarts (eg. indirections)");
12134c75e3aaSDag-Erling Smørgrav 		if(iq->qchase.qname)
12144c75e3aaSDag-Erling Smørgrav 			errinf_dname(qstate, "stop at", iq->qchase.qname);
1215b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1216b7579f77SDag-Erling Smørgrav 	}
1217b7579f77SDag-Erling Smørgrav 
1218b7579f77SDag-Erling Smørgrav 	/* We enforce a maximum recursion/dependency depth -- in general,
1219b7579f77SDag-Erling Smørgrav 	 * this is unnecessary for dependency loops (although it will
1220b7579f77SDag-Erling Smørgrav 	 * catch those), but it provides a sensible limit to the amount
1221b7579f77SDag-Erling Smørgrav 	 * of work required to answer a given query. */
1222b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "request has dependency depth of %d", iq->depth);
1223b7579f77SDag-Erling Smørgrav 	if(iq->depth > ie->max_dependency_depth) {
1224b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum "
1225b7579f77SDag-Erling Smørgrav 			"dependency depth with depth of %d", iq->depth);
12264c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "request has exceeded the maximum dependency "
12274c75e3aaSDag-Erling Smørgrav 			"depth (eg. nameserver lookup recursion)");
1228b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1229b7579f77SDag-Erling Smørgrav 	}
1230b7579f77SDag-Erling Smørgrav 
1231b7579f77SDag-Erling Smørgrav 	/* If the request is qclass=ANY, setup to generate each class */
1232b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qclass == LDNS_RR_CLASS_ANY) {
1233b7579f77SDag-Erling Smørgrav 		iq->qchase.qclass = 0;
1234b7579f77SDag-Erling Smørgrav 		return next_state(iq, COLLECT_CLASS_STATE);
1235b7579f77SDag-Erling Smørgrav 	}
1236b7579f77SDag-Erling Smørgrav 
1237c7f4d7adSDag-Erling Smørgrav 	/*
1238c7f4d7adSDag-Erling Smørgrav 	 * If we are restricted by a forward-zone or a stub-zone, we
1239c7f4d7adSDag-Erling Smørgrav 	 * can't re-fetch glue for this delegation point.
1240c7f4d7adSDag-Erling Smørgrav 	 * we won’t try to re-fetch glue if the iq->dp is null.
1241c7f4d7adSDag-Erling Smørgrav 	 */
1242c7f4d7adSDag-Erling Smørgrav 	if (iq->refetch_glue &&
1243c7f4d7adSDag-Erling Smørgrav 	        iq->dp &&
12447da0adf7SDag-Erling Smørgrav 	        !can_have_last_resort(qstate->env, iq->dp->name,
12457da0adf7SDag-Erling Smørgrav 	             iq->dp->namelen, iq->qchase.qclass, NULL)) {
1246c7f4d7adSDag-Erling Smørgrav 	    iq->refetch_glue = 0;
1247c7f4d7adSDag-Erling Smørgrav 	}
1248c7f4d7adSDag-Erling Smørgrav 
1249b7579f77SDag-Erling Smørgrav 	/* Resolver Algorithm Step 1 -- Look for the answer in local data. */
1250b7579f77SDag-Erling Smørgrav 
1251b7579f77SDag-Erling Smørgrav 	/* This either results in a query restart (CNAME cache response), a
1252b7579f77SDag-Erling Smørgrav 	 * terminating response (ANSWER), or a cache miss (null). */
1253b7579f77SDag-Erling Smørgrav 
1254e86b9096SDag-Erling Smørgrav 	if (iter_stub_fwd_no_cache(qstate, &iq->qchase)) {
12554c75e3aaSDag-Erling Smørgrav 		/* Asked to not query cache. */
12564c75e3aaSDag-Erling Smørgrav 		verbose(VERB_ALGO, "no-cache set, going to the network");
12574c75e3aaSDag-Erling Smørgrav 		qstate->no_cache_lookup = 1;
12584c75e3aaSDag-Erling Smørgrav 		qstate->no_cache_store = 1;
12594c75e3aaSDag-Erling Smørgrav 		msg = NULL;
12604c75e3aaSDag-Erling Smørgrav 	} else if(qstate->blacklist) {
1261b7579f77SDag-Erling Smørgrav 		/* if cache, or anything else, was blacklisted then
1262b7579f77SDag-Erling Smørgrav 		 * getting older results from cache is a bad idea, no cache */
1263b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "cache blacklisted, going to the network");
1264b7579f77SDag-Erling Smørgrav 		msg = NULL;
1265bc892140SDag-Erling Smørgrav 	} else if(!qstate->no_cache_lookup) {
1266b7579f77SDag-Erling Smørgrav 		msg = dns_cache_lookup(qstate->env, iq->qchase.qname,
1267b7579f77SDag-Erling Smørgrav 			iq->qchase.qname_len, iq->qchase.qtype,
1268ff825849SDag-Erling Smørgrav 			iq->qchase.qclass, qstate->query_flags,
126957bddd21SDag-Erling Smørgrav 			qstate->region, qstate->env->scratch, 0);
12700fb34990SDag-Erling Smørgrav 		if(!msg && qstate->env->neg_cache &&
12710fb34990SDag-Erling Smørgrav 			iter_qname_indicates_dnssec(qstate->env, &iq->qchase)) {
1272b7579f77SDag-Erling Smørgrav 			/* lookup in negative cache; may result in
1273b7579f77SDag-Erling Smørgrav 			 * NOERROR/NODATA or NXDOMAIN answers that need validation */
1274b7579f77SDag-Erling Smørgrav 			msg = val_neg_getmsg(qstate->env->neg_cache, &iq->qchase,
1275b7579f77SDag-Erling Smørgrav 				qstate->region, qstate->env->rrset_cache,
1276b7579f77SDag-Erling Smørgrav 				qstate->env->scratch_buffer,
127757bddd21SDag-Erling Smørgrav 				*qstate->env->now, 1/*add SOA*/, NULL,
127857bddd21SDag-Erling Smørgrav 				qstate->env->cfg);
1279b7579f77SDag-Erling Smørgrav 		}
1280b7579f77SDag-Erling Smørgrav 		/* item taken from cache does not match our query name, thus
1281b7579f77SDag-Erling Smørgrav 		 * security needs to be re-examined later */
1282b7579f77SDag-Erling Smørgrav 		if(msg && query_dname_compare(qstate->qinfo.qname,
1283b7579f77SDag-Erling Smørgrav 			iq->qchase.qname) != 0)
1284b7579f77SDag-Erling Smørgrav 			msg->rep->security = sec_status_unchecked;
1285b7579f77SDag-Erling Smørgrav 	}
1286b7579f77SDag-Erling Smørgrav 	if(msg) {
1287b7579f77SDag-Erling Smørgrav 		/* handle positive cache response */
1288b7579f77SDag-Erling Smørgrav 		enum response_type type = response_type_from_cache(msg,
1289b7579f77SDag-Erling Smørgrav 			&iq->qchase);
1290b7579f77SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO) {
1291b7579f77SDag-Erling Smørgrav 			log_dns_msg("msg from cache lookup", &msg->qinfo,
1292b7579f77SDag-Erling Smørgrav 				msg->rep);
1293b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "msg ttl is %d, prefetch ttl %d",
1294b7579f77SDag-Erling Smørgrav 				(int)msg->rep->ttl,
1295b7579f77SDag-Erling Smørgrav 				(int)msg->rep->prefetch_ttl);
1296b7579f77SDag-Erling Smørgrav 		}
1297b7579f77SDag-Erling Smørgrav 
1298b7579f77SDag-Erling Smørgrav 		if(type == RESPONSE_TYPE_CNAME) {
1299b7579f77SDag-Erling Smørgrav 			uint8_t* sname = 0;
1300b7579f77SDag-Erling Smørgrav 			size_t slen = 0;
1301b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "returning CNAME response from "
1302b7579f77SDag-Erling Smørgrav 				"cache");
1303b7579f77SDag-Erling Smørgrav 			if(!handle_cname_response(qstate, iq, msg,
13044c75e3aaSDag-Erling Smørgrav 				&sname, &slen)) {
13054c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "failed to prepend CNAME "
13064c75e3aaSDag-Erling Smørgrav 					"components, malloc failure");
1307b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1308b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
13094c75e3aaSDag-Erling Smørgrav 			}
1310b7579f77SDag-Erling Smørgrav 			iq->qchase.qname = sname;
1311b7579f77SDag-Erling Smørgrav 			iq->qchase.qname_len = slen;
1312b7579f77SDag-Erling Smørgrav 			/* This *is* a query restart, even if it is a cheap
1313b7579f77SDag-Erling Smørgrav 			 * one. */
1314b7579f77SDag-Erling Smørgrav 			iq->dp = NULL;
1315b7579f77SDag-Erling Smørgrav 			iq->refetch_glue = 0;
1316b7579f77SDag-Erling Smørgrav 			iq->query_restart_count++;
1317b7579f77SDag-Erling Smørgrav 			iq->sent_count = 0;
1318b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin, NULL, 0, qstate->region);
131905ab2901SDag-Erling Smørgrav 			if(qstate->env->cfg->qname_minimisation)
132005ab2901SDag-Erling Smørgrav 				iq->minimisation_state = INIT_MINIMISE_STATE;
1321b7579f77SDag-Erling Smørgrav 			return next_state(iq, INIT_REQUEST_STATE);
1322b7579f77SDag-Erling Smørgrav 		}
1323b7579f77SDag-Erling Smørgrav 
1324b7579f77SDag-Erling Smørgrav 		/* if from cache, NULL, else insert 'cache IP' len=0 */
1325b7579f77SDag-Erling Smørgrav 		if(qstate->reply_origin)
1326b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin, NULL, 0, qstate->region);
13274c75e3aaSDag-Erling Smørgrav 		if(FLAGS_GET_RCODE(msg->rep->flags) == LDNS_RCODE_SERVFAIL)
13284c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "SERVFAIL in cache");
1329b7579f77SDag-Erling Smørgrav 		/* it is an answer, response, to final state */
1330b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "returning answer from cache.");
1331b7579f77SDag-Erling Smørgrav 		iq->response = msg;
1332b7579f77SDag-Erling Smørgrav 		return final_state(iq);
1333b7579f77SDag-Erling Smørgrav 	}
1334b7579f77SDag-Erling Smørgrav 
1335b7579f77SDag-Erling Smørgrav 	/* attempt to forward the request */
1336b7579f77SDag-Erling Smørgrav 	if(forward_request(qstate, iq))
1337b7579f77SDag-Erling Smørgrav 	{
1338b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
1339b7579f77SDag-Erling Smørgrav 			log_err("alloc failure for forward dp");
13404c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure for forward zone");
1341b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1342b7579f77SDag-Erling Smørgrav 		}
1343b7579f77SDag-Erling Smørgrav 		iq->refetch_glue = 0;
134405ab2901SDag-Erling Smørgrav 		iq->minimisation_state = DONOT_MINIMISE_STATE;
1345b7579f77SDag-Erling Smørgrav 		/* the request has been forwarded.
1346b7579f77SDag-Erling Smørgrav 		 * forwarded requests need to be immediately sent to the
1347b7579f77SDag-Erling Smørgrav 		 * next state, QUERYTARGETS. */
1348b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
1349b7579f77SDag-Erling Smørgrav 	}
1350b7579f77SDag-Erling Smørgrav 
1351b7579f77SDag-Erling Smørgrav 	/* Resolver Algorithm Step 2 -- find the "best" servers. */
1352b7579f77SDag-Erling Smørgrav 
1353b7579f77SDag-Erling Smørgrav 	/* first, adjust for DS queries. To avoid the grandparent problem,
1354b7579f77SDag-Erling Smørgrav 	 * we just look for the closest set of server to the parent of qname.
1355b7579f77SDag-Erling Smørgrav 	 * When re-fetching glue we also need to ask the parent.
1356b7579f77SDag-Erling Smørgrav 	 */
1357b7579f77SDag-Erling Smørgrav 	if(iq->refetch_glue) {
1358b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
1359b7579f77SDag-Erling Smørgrav 			log_err("internal or malloc fail: no dp for refetch");
13604c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, for delegation info");
1361b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1362b7579f77SDag-Erling Smørgrav 		}
1363b7579f77SDag-Erling Smørgrav 		delname = iq->dp->name;
1364b7579f77SDag-Erling Smørgrav 		delnamelen = iq->dp->namelen;
1365b7579f77SDag-Erling Smørgrav 	} else {
1366b7579f77SDag-Erling Smørgrav 		delname = iq->qchase.qname;
1367b7579f77SDag-Erling Smørgrav 		delnamelen = iq->qchase.qname_len;
1368b7579f77SDag-Erling Smørgrav 	}
1369b7579f77SDag-Erling Smørgrav 	if(iq->qchase.qtype == LDNS_RR_TYPE_DS || iq->refetch_glue ||
13700fb34990SDag-Erling Smørgrav 	   (iq->qchase.qtype == LDNS_RR_TYPE_NS && qstate->prefetch_leeway
13717da0adf7SDag-Erling Smørgrav 	   && can_have_last_resort(qstate->env, delname, delnamelen, iq->qchase.qclass, NULL))) {
1372b7579f77SDag-Erling Smørgrav 		/* remove first label from delname, root goes to hints,
1373b7579f77SDag-Erling Smørgrav 		 * but only to fetch glue, not for qtype=DS. */
1374b7579f77SDag-Erling Smørgrav 		/* also when prefetching an NS record, fetch it again from
1375b7579f77SDag-Erling Smørgrav 		 * its parent, just as if it expired, so that you do not
1376b7579f77SDag-Erling Smørgrav 		 * get stuck on an older nameserver that gives old NSrecords */
1377b7579f77SDag-Erling Smørgrav 		if(dname_is_root(delname) && (iq->refetch_glue ||
1378b7579f77SDag-Erling Smørgrav 			(iq->qchase.qtype == LDNS_RR_TYPE_NS &&
1379b7579f77SDag-Erling Smørgrav 			qstate->prefetch_leeway)))
1380b7579f77SDag-Erling Smørgrav 			delname = NULL; /* go to root priming */
1381b7579f77SDag-Erling Smørgrav 		else 	dname_remove_label(&delname, &delnamelen);
1382b7579f77SDag-Erling Smørgrav 	}
1383b7579f77SDag-Erling Smørgrav 	/* delname is the name to lookup a delegation for. If NULL rootprime */
1384b7579f77SDag-Erling Smørgrav 	while(1) {
1385b7579f77SDag-Erling Smørgrav 
1386b7579f77SDag-Erling Smørgrav 		/* Lookup the delegation in the cache. If null, then the
1387b7579f77SDag-Erling Smørgrav 		 * cache needs to be primed for the qclass. */
1388b7579f77SDag-Erling Smørgrav 		if(delname)
1389b7579f77SDag-Erling Smørgrav 		     iq->dp = dns_cache_find_delegation(qstate->env, delname,
1390b7579f77SDag-Erling Smørgrav 			delnamelen, iq->qchase.qtype, iq->qchase.qclass,
1391b7579f77SDag-Erling Smørgrav 			qstate->region, &iq->deleg_msg,
1392b7579f77SDag-Erling Smørgrav 			*qstate->env->now+qstate->prefetch_leeway);
1393b7579f77SDag-Erling Smørgrav 		else iq->dp = NULL;
1394b7579f77SDag-Erling Smørgrav 
1395b7579f77SDag-Erling Smørgrav 		/* If the cache has returned nothing, then we have a
1396b7579f77SDag-Erling Smørgrav 		 * root priming situation. */
1397b7579f77SDag-Erling Smørgrav 		if(iq->dp == NULL) {
139857bddd21SDag-Erling Smørgrav 			int r;
139957bddd21SDag-Erling Smørgrav 			/* if under auth zone, no prime needed */
140057bddd21SDag-Erling Smørgrav 			if(!auth_zone_delegpt(qstate, iq, delname, delnamelen))
140157bddd21SDag-Erling Smørgrav 				return error_response(qstate, id,
140257bddd21SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
140357bddd21SDag-Erling Smørgrav 			if(iq->dp) /* use auth zone dp */
140457bddd21SDag-Erling Smørgrav 				return next_state(iq, INIT_REQUEST_2_STATE);
1405b7579f77SDag-Erling Smørgrav 			/* if there is a stub, then no root prime needed */
140657bddd21SDag-Erling Smørgrav 			r = prime_stub(qstate, iq, id, delname,
1407b7579f77SDag-Erling Smørgrav 				iq->qchase.qclass);
1408b7579f77SDag-Erling Smørgrav 			if(r == 2)
1409b7579f77SDag-Erling Smørgrav 				break; /* got noprime-stub-zone, continue */
1410b7579f77SDag-Erling Smørgrav 			else if(r)
1411b7579f77SDag-Erling Smørgrav 				return 0; /* stub prime request made */
1412b7579f77SDag-Erling Smørgrav 			if(forwards_lookup_root(qstate->env->fwds,
1413b7579f77SDag-Erling Smørgrav 				iq->qchase.qclass)) {
1414b7579f77SDag-Erling Smørgrav 				/* forward zone root, no root prime needed */
1415b7579f77SDag-Erling Smørgrav 				/* fill in some dp - safety belt */
1416b7579f77SDag-Erling Smørgrav 				iq->dp = hints_lookup_root(qstate->env->hints,
1417b7579f77SDag-Erling Smørgrav 					iq->qchase.qclass);
1418b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1419b7579f77SDag-Erling Smørgrav 					log_err("internal error: no hints dp");
14204c75e3aaSDag-Erling Smørgrav 					errinf(qstate, "no hints for this class");
1421b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1422b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1423b7579f77SDag-Erling Smørgrav 				}
1424b7579f77SDag-Erling Smørgrav 				iq->dp = delegpt_copy(iq->dp, qstate->region);
1425b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1426b7579f77SDag-Erling Smørgrav 					log_err("out of memory in safety belt");
14274c75e3aaSDag-Erling Smørgrav 					errinf(qstate, "malloc failure, in safety belt");
1428b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1429b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1430b7579f77SDag-Erling Smørgrav 				}
1431b7579f77SDag-Erling Smørgrav 				return next_state(iq, INIT_REQUEST_2_STATE);
1432b7579f77SDag-Erling Smørgrav 			}
1433b7579f77SDag-Erling Smørgrav 			/* Note that the result of this will set a new
1434b7579f77SDag-Erling Smørgrav 			 * DelegationPoint based on the result of priming. */
1435b7579f77SDag-Erling Smørgrav 			if(!prime_root(qstate, iq, id, iq->qchase.qclass))
1436b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1437b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_REFUSED);
1438b7579f77SDag-Erling Smørgrav 
1439b7579f77SDag-Erling Smørgrav 			/* priming creates and sends a subordinate query, with
1440b7579f77SDag-Erling Smørgrav 			 * this query as the parent. So further processing for
1441b7579f77SDag-Erling Smørgrav 			 * this event will stop until reactivated by the
1442b7579f77SDag-Erling Smørgrav 			 * results of priming. */
1443b7579f77SDag-Erling Smørgrav 			return 0;
1444b7579f77SDag-Erling Smørgrav 		}
144509a3aaf3SDag-Erling Smørgrav 		if(!iq->ratelimit_ok && qstate->prefetch_leeway)
144609a3aaf3SDag-Erling Smørgrav 			iq->ratelimit_ok = 1; /* allow prefetches, this keeps
144709a3aaf3SDag-Erling Smørgrav 			otherwise valid data in the cache */
144809a3aaf3SDag-Erling Smørgrav 		if(!iq->ratelimit_ok && infra_ratelimit_exceeded(
144909a3aaf3SDag-Erling Smørgrav 			qstate->env->infra_cache, iq->dp->name,
145009a3aaf3SDag-Erling Smørgrav 			iq->dp->namelen, *qstate->env->now)) {
145109a3aaf3SDag-Erling Smørgrav 			/* and increment the rate, so that the rate for time
145209a3aaf3SDag-Erling Smørgrav 			 * now will also exceed the rate, keeping cache fresh */
145309a3aaf3SDag-Erling Smørgrav 			(void)infra_ratelimit_inc(qstate->env->infra_cache,
145409a3aaf3SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
1455e86b9096SDag-Erling Smørgrav 				*qstate->env->now, &qstate->qinfo,
1456e86b9096SDag-Erling Smørgrav 				qstate->reply);
145709a3aaf3SDag-Erling Smørgrav 			/* see if we are passed through with slip factor */
145809a3aaf3SDag-Erling Smørgrav 			if(qstate->env->cfg->ratelimit_factor != 0 &&
145909a3aaf3SDag-Erling Smørgrav 				ub_random_max(qstate->env->rnd,
146009a3aaf3SDag-Erling Smørgrav 				    qstate->env->cfg->ratelimit_factor) == 1) {
146109a3aaf3SDag-Erling Smørgrav 				iq->ratelimit_ok = 1;
146209a3aaf3SDag-Erling Smørgrav 				log_nametypeclass(VERB_ALGO, "ratelimit allowed through for "
146309a3aaf3SDag-Erling Smørgrav 					"delegation point", iq->dp->name,
146409a3aaf3SDag-Erling Smørgrav 					LDNS_RR_TYPE_NS, LDNS_RR_CLASS_IN);
146509a3aaf3SDag-Erling Smørgrav 			} else {
1466971980c3SDag-Erling Smørgrav 				lock_basic_lock(&ie->queries_ratelimit_lock);
1467971980c3SDag-Erling Smørgrav 				ie->num_queries_ratelimited++;
1468971980c3SDag-Erling Smørgrav 				lock_basic_unlock(&ie->queries_ratelimit_lock);
146909a3aaf3SDag-Erling Smørgrav 				log_nametypeclass(VERB_ALGO, "ratelimit exceeded with "
147009a3aaf3SDag-Erling Smørgrav 					"delegation point", iq->dp->name,
147109a3aaf3SDag-Erling Smørgrav 					LDNS_RR_TYPE_NS, LDNS_RR_CLASS_IN);
14724c75e3aaSDag-Erling Smørgrav 				qstate->was_ratelimited = 1;
14734c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "query was ratelimited");
14744c75e3aaSDag-Erling Smørgrav 				errinf_dname(qstate, "for zone", iq->dp->name);
147509a3aaf3SDag-Erling Smørgrav 				return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
147609a3aaf3SDag-Erling Smørgrav 			}
147709a3aaf3SDag-Erling Smørgrav 		}
1478b7579f77SDag-Erling Smørgrav 
1479b7579f77SDag-Erling Smørgrav 		/* see if this dp not useless.
1480b7579f77SDag-Erling Smørgrav 		 * It is useless if:
1481b7579f77SDag-Erling Smørgrav 		 *	o all NS items are required glue.
1482b7579f77SDag-Erling Smørgrav 		 *	  or the query is for NS item that is required glue.
1483b7579f77SDag-Erling Smørgrav 		 *	o no addresses are provided.
1484b7579f77SDag-Erling Smørgrav 		 *	o RD qflag is on.
1485b7579f77SDag-Erling Smørgrav 		 * Instead, go up one level, and try to get even further
1486b7579f77SDag-Erling Smørgrav 		 * If the root was useless, use safety belt information.
1487b7579f77SDag-Erling Smørgrav 		 * Only check cache returns, because replies for servers
1488b7579f77SDag-Erling Smørgrav 		 * could be useless but lead to loops (bumping into the
1489b7579f77SDag-Erling Smørgrav 		 * same server reply) if useless-checked.
1490b7579f77SDag-Erling Smørgrav 		 */
1491b7579f77SDag-Erling Smørgrav 		if(iter_dp_is_useless(&qstate->qinfo, qstate->query_flags,
1492b7579f77SDag-Erling Smørgrav 			iq->dp)) {
14937da0adf7SDag-Erling Smørgrav 			struct delegpt* retdp = NULL;
14947da0adf7SDag-Erling Smørgrav 			if(!can_have_last_resort(qstate->env, iq->dp->name, iq->dp->namelen, iq->qchase.qclass, &retdp)) {
14957da0adf7SDag-Erling Smørgrav 				if(retdp) {
14967da0adf7SDag-Erling Smørgrav 					verbose(VERB_QUERY, "cache has stub "
14977da0adf7SDag-Erling Smørgrav 						"or fwd but no addresses, "
14987da0adf7SDag-Erling Smørgrav 						"fallback to config");
14997da0adf7SDag-Erling Smørgrav 					iq->dp = delegpt_copy(retdp,
15007da0adf7SDag-Erling Smørgrav 						qstate->region);
15017da0adf7SDag-Erling Smørgrav 					if(!iq->dp) {
15027da0adf7SDag-Erling Smørgrav 						log_err("out of memory in "
15037da0adf7SDag-Erling Smørgrav 							"stub/fwd fallback");
15044c75e3aaSDag-Erling Smørgrav 						errinf(qstate, "malloc failure, for fallback to config");
15057da0adf7SDag-Erling Smørgrav 						return error_response(qstate,
15067da0adf7SDag-Erling Smørgrav 						    id, LDNS_RCODE_SERVFAIL);
15077da0adf7SDag-Erling Smørgrav 					}
15087da0adf7SDag-Erling Smørgrav 					break;
15097da0adf7SDag-Erling Smørgrav 				}
15100fb34990SDag-Erling Smørgrav 				verbose(VERB_ALGO, "useless dp "
15110fb34990SDag-Erling Smørgrav 					"but cannot go up, servfail");
15127da0adf7SDag-Erling Smørgrav 				delegpt_log(VERB_ALGO, iq->dp);
15134c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "no useful nameservers, "
15144c75e3aaSDag-Erling Smørgrav 					"and cannot go up");
15154c75e3aaSDag-Erling Smørgrav 				errinf_dname(qstate, "for zone", iq->dp->name);
15160fb34990SDag-Erling Smørgrav 				return error_response(qstate, id,
15170fb34990SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
15180fb34990SDag-Erling Smørgrav 			}
1519b7579f77SDag-Erling Smørgrav 			if(dname_is_root(iq->dp->name)) {
1520b7579f77SDag-Erling Smørgrav 				/* use safety belt */
1521b7579f77SDag-Erling Smørgrav 				verbose(VERB_QUERY, "Cache has root NS but "
1522b7579f77SDag-Erling Smørgrav 				"no addresses. Fallback to the safety belt.");
1523b7579f77SDag-Erling Smørgrav 				iq->dp = hints_lookup_root(qstate->env->hints,
1524b7579f77SDag-Erling Smørgrav 					iq->qchase.qclass);
1525b7579f77SDag-Erling Smørgrav 				/* note deleg_msg is from previous lookup,
1526b7579f77SDag-Erling Smørgrav 				 * but RD is on, so it is not used */
1527b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1528b7579f77SDag-Erling Smørgrav 					log_err("internal error: no hints dp");
1529b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1530b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_REFUSED);
1531b7579f77SDag-Erling Smørgrav 				}
1532b7579f77SDag-Erling Smørgrav 				iq->dp = delegpt_copy(iq->dp, qstate->region);
1533b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1534b7579f77SDag-Erling Smørgrav 					log_err("out of memory in safety belt");
15354c75e3aaSDag-Erling Smørgrav 					errinf(qstate, "malloc failure, in safety belt, for root");
1536b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1537b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1538b7579f77SDag-Erling Smørgrav 				}
1539b7579f77SDag-Erling Smørgrav 				break;
1540b7579f77SDag-Erling Smørgrav 			} else {
1541b7579f77SDag-Erling Smørgrav 				verbose(VERB_ALGO,
1542b7579f77SDag-Erling Smørgrav 					"cache delegation was useless:");
1543b7579f77SDag-Erling Smørgrav 				delegpt_log(VERB_ALGO, iq->dp);
1544b7579f77SDag-Erling Smørgrav 				/* go up */
1545b7579f77SDag-Erling Smørgrav 				delname = iq->dp->name;
1546b7579f77SDag-Erling Smørgrav 				delnamelen = iq->dp->namelen;
1547b7579f77SDag-Erling Smørgrav 				dname_remove_label(&delname, &delnamelen);
1548b7579f77SDag-Erling Smørgrav 			}
1549b7579f77SDag-Erling Smørgrav 		} else break;
1550b7579f77SDag-Erling Smørgrav 	}
1551b7579f77SDag-Erling Smørgrav 
1552b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "cache delegation returns delegpt");
1553b7579f77SDag-Erling Smørgrav 	delegpt_log(VERB_ALGO, iq->dp);
1554b7579f77SDag-Erling Smørgrav 
1555b7579f77SDag-Erling Smørgrav 	/* Otherwise, set the current delegation point and move on to the
1556b7579f77SDag-Erling Smørgrav 	 * next state. */
1557b7579f77SDag-Erling Smørgrav 	return next_state(iq, INIT_REQUEST_2_STATE);
1558b7579f77SDag-Erling Smørgrav }
1559b7579f77SDag-Erling Smørgrav 
1560b7579f77SDag-Erling Smørgrav /**
1561b7579f77SDag-Erling Smørgrav  * Process the second part of the initial request handling. This state
1562b7579f77SDag-Erling Smørgrav  * basically exists so that queries that generate root priming events have
1563b7579f77SDag-Erling Smørgrav  * the same init processing as ones that do not. Request events that reach
1564b7579f77SDag-Erling Smørgrav  * this state must have a valid currentDelegationPoint set.
1565b7579f77SDag-Erling Smørgrav  *
15668a384985SDag-Erling Smørgrav  * This part is primarily handling stub zone priming. Events that reach this
1567b7579f77SDag-Erling Smørgrav  * state must have a current delegation point.
1568b7579f77SDag-Erling Smørgrav  *
1569b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1570b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1571b7579f77SDag-Erling Smørgrav  * @param id: module id.
1572b7579f77SDag-Erling Smørgrav  * @return true if the event needs more request processing immediately,
1573b7579f77SDag-Erling Smørgrav  *         false if not.
1574b7579f77SDag-Erling Smørgrav  */
1575b7579f77SDag-Erling Smørgrav static int
1576b7579f77SDag-Erling Smørgrav processInitRequest2(struct module_qstate* qstate, struct iter_qstate* iq,
1577b7579f77SDag-Erling Smørgrav 	int id)
1578b7579f77SDag-Erling Smørgrav {
1579b7579f77SDag-Erling Smørgrav 	uint8_t* delname;
1580b7579f77SDag-Erling Smørgrav 	size_t delnamelen;
1581b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "resolving (init part 2): ",
1582b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
1583b7579f77SDag-Erling Smørgrav 
158457bddd21SDag-Erling Smørgrav 	delname = iq->qchase.qname;
158557bddd21SDag-Erling Smørgrav 	delnamelen = iq->qchase.qname_len;
1586b7579f77SDag-Erling Smørgrav 	if(iq->refetch_glue) {
158757bddd21SDag-Erling Smørgrav 		struct iter_hints_stub* stub;
1588b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
1589b7579f77SDag-Erling Smørgrav 			log_err("internal or malloc fail: no dp for refetch");
15904c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, no delegation info");
1591b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1592b7579f77SDag-Erling Smørgrav 		}
159357bddd21SDag-Erling Smørgrav 		/* Do not send queries above stub, do not set delname to dp if
159457bddd21SDag-Erling Smørgrav 		 * this is above stub without stub-first. */
159557bddd21SDag-Erling Smørgrav 		stub = hints_lookup_stub(
159657bddd21SDag-Erling Smørgrav 			qstate->env->hints, iq->qchase.qname, iq->qchase.qclass,
159757bddd21SDag-Erling Smørgrav 			iq->dp);
159857bddd21SDag-Erling Smørgrav 		if(!stub || !stub->dp->has_parent_side_NS ||
159957bddd21SDag-Erling Smørgrav 			dname_subdomain_c(iq->dp->name, stub->dp->name)) {
1600b7579f77SDag-Erling Smørgrav 			delname = iq->dp->name;
1601b7579f77SDag-Erling Smørgrav 			delnamelen = iq->dp->namelen;
160257bddd21SDag-Erling Smørgrav 		}
1603b7579f77SDag-Erling Smørgrav 	}
1604b7579f77SDag-Erling Smørgrav 	if(iq->qchase.qtype == LDNS_RR_TYPE_DS || iq->refetch_glue) {
1605b7579f77SDag-Erling Smørgrav 		if(!dname_is_root(delname))
1606b7579f77SDag-Erling Smørgrav 			dname_remove_label(&delname, &delnamelen);
1607b7579f77SDag-Erling Smørgrav 		iq->refetch_glue = 0; /* if CNAME causes restart, no refetch */
1608b7579f77SDag-Erling Smørgrav 	}
160957bddd21SDag-Erling Smørgrav 
161057bddd21SDag-Erling Smørgrav 	/* see if we have an auth zone to answer from, improves dp from cache
161157bddd21SDag-Erling Smørgrav 	 * (if any dp from cache) with auth zone dp, if that is lower */
161257bddd21SDag-Erling Smørgrav 	if(!auth_zone_delegpt(qstate, iq, delname, delnamelen))
161357bddd21SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
161457bddd21SDag-Erling Smørgrav 
1615b7579f77SDag-Erling Smørgrav 	/* Check to see if we need to prime a stub zone. */
1616b7579f77SDag-Erling Smørgrav 	if(prime_stub(qstate, iq, id, delname, iq->qchase.qclass)) {
1617b7579f77SDag-Erling Smørgrav 		/* A priming sub request was made */
1618b7579f77SDag-Erling Smørgrav 		return 0;
1619b7579f77SDag-Erling Smørgrav 	}
1620b7579f77SDag-Erling Smørgrav 
1621b7579f77SDag-Erling Smørgrav 	/* most events just get forwarded to the next state. */
1622b7579f77SDag-Erling Smørgrav 	return next_state(iq, INIT_REQUEST_3_STATE);
1623b7579f77SDag-Erling Smørgrav }
1624b7579f77SDag-Erling Smørgrav 
1625b7579f77SDag-Erling Smørgrav /**
1626b7579f77SDag-Erling Smørgrav  * Process the third part of the initial request handling. This state exists
1627b7579f77SDag-Erling Smørgrav  * as a separate state so that queries that generate stub priming events
1628b7579f77SDag-Erling Smørgrav  * will get the tail end of the init process but not repeat the stub priming
1629b7579f77SDag-Erling Smørgrav  * check.
1630b7579f77SDag-Erling Smørgrav  *
1631b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1632b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1633b7579f77SDag-Erling Smørgrav  * @param id: module id.
1634b7579f77SDag-Erling Smørgrav  * @return true, advancing the event to the QUERYTARGETS_STATE.
1635b7579f77SDag-Erling Smørgrav  */
1636b7579f77SDag-Erling Smørgrav static int
1637b7579f77SDag-Erling Smørgrav processInitRequest3(struct module_qstate* qstate, struct iter_qstate* iq,
1638b7579f77SDag-Erling Smørgrav 	int id)
1639b7579f77SDag-Erling Smørgrav {
1640b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "resolving (init part 3): ",
1641b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
1642b7579f77SDag-Erling Smørgrav 	/* if the cache reply dp equals a validation anchor or msg has DS,
1643b7579f77SDag-Erling Smørgrav 	 * then DNSSEC RRSIGs are expected in the reply */
1644b7579f77SDag-Erling Smørgrav 	iq->dnssec_expected = iter_indicates_dnssec(qstate->env, iq->dp,
1645b7579f77SDag-Erling Smørgrav 		iq->deleg_msg, iq->qchase.qclass);
1646b7579f77SDag-Erling Smørgrav 
1647b7579f77SDag-Erling Smørgrav 	/* If the RD flag wasn't set, then we just finish with the
1648b7579f77SDag-Erling Smørgrav 	 * cached referral as the response. */
164965b390aaSDag-Erling Smørgrav 	if(!(qstate->query_flags & BIT_RD) && iq->deleg_msg) {
1650b7579f77SDag-Erling Smørgrav 		iq->response = iq->deleg_msg;
165117d15b25SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO && iq->response)
1652b7579f77SDag-Erling Smørgrav 			log_dns_msg("no RD requested, using delegation msg",
1653b7579f77SDag-Erling Smørgrav 				&iq->response->qinfo, iq->response->rep);
1654b7579f77SDag-Erling Smørgrav 		if(qstate->reply_origin)
1655b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin, NULL, 0, qstate->region);
1656b7579f77SDag-Erling Smørgrav 		return final_state(iq);
1657b7579f77SDag-Erling Smørgrav 	}
1658b7579f77SDag-Erling Smørgrav 	/* After this point, unset the RD flag -- this query is going to
1659b7579f77SDag-Erling Smørgrav 	 * be sent to an auth. server. */
1660b7579f77SDag-Erling Smørgrav 	iq->chase_flags &= ~BIT_RD;
1661b7579f77SDag-Erling Smørgrav 
1662b7579f77SDag-Erling Smørgrav 	/* if dnssec expected, fetch key for the trust-anchor or cached-DS */
1663b7579f77SDag-Erling Smørgrav 	if(iq->dnssec_expected && qstate->env->cfg->prefetch_key &&
1664b7579f77SDag-Erling Smørgrav 		!(qstate->query_flags&BIT_CD)) {
1665b7579f77SDag-Erling Smørgrav 		generate_dnskey_prefetch(qstate, iq, id);
1666b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
1667b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
1668b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
1669b7579f77SDag-Erling Smørgrav 	}
1670b7579f77SDag-Erling Smørgrav 
1671b7579f77SDag-Erling Smørgrav 	/* Jump to the next state. */
1672b7579f77SDag-Erling Smørgrav 	return next_state(iq, QUERYTARGETS_STATE);
1673b7579f77SDag-Erling Smørgrav }
1674b7579f77SDag-Erling Smørgrav 
1675b7579f77SDag-Erling Smørgrav /**
1676b7579f77SDag-Erling Smørgrav  * Given a basic query, generate a parent-side "target" query.
1677b7579f77SDag-Erling Smørgrav  * These are subordinate queries for missing delegation point target addresses,
1678b7579f77SDag-Erling Smørgrav  * for which only the parent of the delegation provides correct IP addresses.
1679b7579f77SDag-Erling Smørgrav  *
1680b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1681b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1682b7579f77SDag-Erling Smørgrav  * @param id: module id.
1683b7579f77SDag-Erling Smørgrav  * @param name: target qname.
1684b7579f77SDag-Erling Smørgrav  * @param namelen: target qname length.
1685b7579f77SDag-Erling Smørgrav  * @param qtype: target qtype (either A or AAAA).
1686b7579f77SDag-Erling Smørgrav  * @param qclass: target qclass.
1687b7579f77SDag-Erling Smørgrav  * @return true on success, false on failure.
1688b7579f77SDag-Erling Smørgrav  */
1689b7579f77SDag-Erling Smørgrav static int
1690b7579f77SDag-Erling Smørgrav generate_parentside_target_query(struct module_qstate* qstate,
1691b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq, int id, uint8_t* name, size_t namelen,
1692b7579f77SDag-Erling Smørgrav 	uint16_t qtype, uint16_t qclass)
1693b7579f77SDag-Erling Smørgrav {
1694b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1695b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(name, namelen, qtype, qclass, qstate,
1696b7579f77SDag-Erling Smørgrav 		id, iq, INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0))
1697b7579f77SDag-Erling Smørgrav 		return 0;
1698b7579f77SDag-Erling Smørgrav 	if(subq) {
1699b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
1700b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
1701b7579f77SDag-Erling Smørgrav 		/* blacklist the cache - we want to fetch parent stuff */
1702b7579f77SDag-Erling Smørgrav 		sock_list_insert(&subq->blacklist, NULL, 0, subq->region);
1703b7579f77SDag-Erling Smørgrav 		subiq->query_for_pside_glue = 1;
1704b7579f77SDag-Erling Smørgrav 		if(dname_subdomain_c(name, iq->dp->name)) {
1705b7579f77SDag-Erling Smørgrav 			subiq->dp = delegpt_copy(iq->dp, subq->region);
1706b7579f77SDag-Erling Smørgrav 			subiq->dnssec_expected = iter_indicates_dnssec(
1707b7579f77SDag-Erling Smørgrav 				qstate->env, subiq->dp, NULL,
1708b7579f77SDag-Erling Smørgrav 				subq->qinfo.qclass);
1709b7579f77SDag-Erling Smørgrav 			subiq->refetch_glue = 1;
1710b7579f77SDag-Erling Smørgrav 		} else {
1711b7579f77SDag-Erling Smørgrav 			subiq->dp = dns_cache_find_delegation(qstate->env,
1712b7579f77SDag-Erling Smørgrav 				name, namelen, qtype, qclass, subq->region,
1713b7579f77SDag-Erling Smørgrav 				&subiq->deleg_msg,
1714b7579f77SDag-Erling Smørgrav 				*qstate->env->now+subq->prefetch_leeway);
1715b7579f77SDag-Erling Smørgrav 			/* if no dp, then it's from root, refetch unneeded */
1716b7579f77SDag-Erling Smørgrav 			if(subiq->dp) {
1717b7579f77SDag-Erling Smørgrav 				subiq->dnssec_expected = iter_indicates_dnssec(
1718b7579f77SDag-Erling Smørgrav 					qstate->env, subiq->dp, NULL,
1719b7579f77SDag-Erling Smørgrav 					subq->qinfo.qclass);
1720b7579f77SDag-Erling Smørgrav 				subiq->refetch_glue = 1;
1721b7579f77SDag-Erling Smørgrav 			}
1722b7579f77SDag-Erling Smørgrav 		}
1723b7579f77SDag-Erling Smørgrav 	}
1724b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_QUERY, "new pside target", name, qtype, qclass);
1725b7579f77SDag-Erling Smørgrav 	return 1;
1726b7579f77SDag-Erling Smørgrav }
1727b7579f77SDag-Erling Smørgrav 
1728b7579f77SDag-Erling Smørgrav /**
1729b7579f77SDag-Erling Smørgrav  * Given a basic query, generate a "target" query. These are subordinate
1730b7579f77SDag-Erling Smørgrav  * queries for missing delegation point target addresses.
1731b7579f77SDag-Erling Smørgrav  *
1732b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1733b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1734b7579f77SDag-Erling Smørgrav  * @param id: module id.
1735b7579f77SDag-Erling Smørgrav  * @param name: target qname.
1736b7579f77SDag-Erling Smørgrav  * @param namelen: target qname length.
1737b7579f77SDag-Erling Smørgrav  * @param qtype: target qtype (either A or AAAA).
1738b7579f77SDag-Erling Smørgrav  * @param qclass: target qclass.
1739b7579f77SDag-Erling Smørgrav  * @return true on success, false on failure.
1740b7579f77SDag-Erling Smørgrav  */
1741b7579f77SDag-Erling Smørgrav static int
1742b7579f77SDag-Erling Smørgrav generate_target_query(struct module_qstate* qstate, struct iter_qstate* iq,
1743b7579f77SDag-Erling Smørgrav         int id, uint8_t* name, size_t namelen, uint16_t qtype, uint16_t qclass)
1744b7579f77SDag-Erling Smørgrav {
1745b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1746b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(name, namelen, qtype, qclass, qstate,
1747b7579f77SDag-Erling Smørgrav 		id, iq, INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0))
1748b7579f77SDag-Erling Smørgrav 		return 0;
1749b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_QUERY, "new target", name, qtype, qclass);
1750b7579f77SDag-Erling Smørgrav 	return 1;
1751b7579f77SDag-Erling Smørgrav }
1752b7579f77SDag-Erling Smørgrav 
1753b7579f77SDag-Erling Smørgrav /**
1754b7579f77SDag-Erling Smørgrav  * Given an event at a certain state, generate zero or more target queries
1755b7579f77SDag-Erling Smørgrav  * for it's current delegation point.
1756b7579f77SDag-Erling Smørgrav  *
1757b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1758b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1759b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
1760b7579f77SDag-Erling Smørgrav  * @param id: module id.
1761b7579f77SDag-Erling Smørgrav  * @param maxtargets: The maximum number of targets to query for.
1762b7579f77SDag-Erling Smørgrav  *	if it is negative, there is no maximum number of targets.
1763b7579f77SDag-Erling Smørgrav  * @param num: returns the number of queries generated and processed,
1764b7579f77SDag-Erling Smørgrav  *	which may be zero if there were no missing targets.
1765b7579f77SDag-Erling Smørgrav  * @return false on error.
1766b7579f77SDag-Erling Smørgrav  */
1767b7579f77SDag-Erling Smørgrav static int
1768b7579f77SDag-Erling Smørgrav query_for_targets(struct module_qstate* qstate, struct iter_qstate* iq,
1769b7579f77SDag-Erling Smørgrav         struct iter_env* ie, int id, int maxtargets, int* num)
1770b7579f77SDag-Erling Smørgrav {
1771b7579f77SDag-Erling Smørgrav 	int query_count = 0;
1772b7579f77SDag-Erling Smørgrav 	struct delegpt_ns* ns;
1773b7579f77SDag-Erling Smørgrav 	int missing;
1774b7579f77SDag-Erling Smørgrav 	int toget = 0;
1775b7579f77SDag-Erling Smørgrav 
1776b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth)
1777b7579f77SDag-Erling Smørgrav 		return 0;
177852df462fSXin LI 	if(iq->depth > 0 && iq->target_count &&
177952df462fSXin LI 		iq->target_count[1] > MAX_TARGET_COUNT) {
17806480faa8SDag-Erling Smørgrav 		char s[LDNS_MAX_DOMAINLEN+1];
17816480faa8SDag-Erling Smørgrav 		dname_str(qstate->qinfo.qname, s);
17826480faa8SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request %s has exceeded the maximum "
17836480faa8SDag-Erling Smørgrav 			"number of glue fetches %d", s, iq->target_count[1]);
178452df462fSXin LI 		return 0;
178552df462fSXin LI 	}
1786b7579f77SDag-Erling Smørgrav 
1787b7579f77SDag-Erling Smørgrav 	iter_mark_cycle_targets(qstate, iq->dp);
1788b7579f77SDag-Erling Smørgrav 	missing = (int)delegpt_count_missing_targets(iq->dp);
1789b7579f77SDag-Erling Smørgrav 	log_assert(maxtargets != 0); /* that would not be useful */
1790b7579f77SDag-Erling Smørgrav 
1791b7579f77SDag-Erling Smørgrav 	/* Generate target requests. Basically, any missing targets
1792b7579f77SDag-Erling Smørgrav 	 * are queried for here, regardless if it is necessary to do
1793b7579f77SDag-Erling Smørgrav 	 * so to continue processing. */
1794b7579f77SDag-Erling Smørgrav 	if(maxtargets < 0 || maxtargets > missing)
1795b7579f77SDag-Erling Smørgrav 		toget = missing;
1796b7579f77SDag-Erling Smørgrav 	else	toget = maxtargets;
1797b7579f77SDag-Erling Smørgrav 	if(toget == 0) {
1798b7579f77SDag-Erling Smørgrav 		*num = 0;
1799b7579f77SDag-Erling Smørgrav 		return 1;
1800b7579f77SDag-Erling Smørgrav 	}
1801b7579f77SDag-Erling Smørgrav 	/* select 'toget' items from the total of 'missing' items */
1802b7579f77SDag-Erling Smørgrav 	log_assert(toget <= missing);
1803b7579f77SDag-Erling Smørgrav 
1804b7579f77SDag-Erling Smørgrav 	/* loop over missing targets */
1805b7579f77SDag-Erling Smørgrav 	for(ns = iq->dp->nslist; ns; ns = ns->next) {
1806b7579f77SDag-Erling Smørgrav 		if(ns->resolved)
1807b7579f77SDag-Erling Smørgrav 			continue;
1808b7579f77SDag-Erling Smørgrav 
1809b7579f77SDag-Erling Smørgrav 		/* randomly select this item with probability toget/missing */
1810b7579f77SDag-Erling Smørgrav 		if(!iter_ns_probability(qstate->env->rnd, toget, missing)) {
1811b7579f77SDag-Erling Smørgrav 			/* do not select this one, next; select toget number
1812b7579f77SDag-Erling Smørgrav 			 * of items from a list one less in size */
1813b7579f77SDag-Erling Smørgrav 			missing --;
1814b7579f77SDag-Erling Smørgrav 			continue;
1815b7579f77SDag-Erling Smørgrav 		}
1816b7579f77SDag-Erling Smørgrav 
1817b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv6 && !ns->got6) {
1818b7579f77SDag-Erling Smørgrav 			/* Send the AAAA request. */
1819b7579f77SDag-Erling Smørgrav 			if(!generate_target_query(qstate, iq, id,
1820b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
1821b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_AAAA, iq->qchase.qclass)) {
1822b7579f77SDag-Erling Smørgrav 				*num = query_count;
1823b7579f77SDag-Erling Smørgrav 				if(query_count > 0)
1824b7579f77SDag-Erling Smørgrav 					qstate->ext_state[id] = module_wait_subquery;
1825b7579f77SDag-Erling Smørgrav 				return 0;
1826b7579f77SDag-Erling Smørgrav 			}
1827b7579f77SDag-Erling Smørgrav 			query_count++;
1828b7579f77SDag-Erling Smørgrav 		}
1829b7579f77SDag-Erling Smørgrav 		/* Send the A request. */
1830b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv4 && !ns->got4) {
1831b7579f77SDag-Erling Smørgrav 			if(!generate_target_query(qstate, iq, id,
1832b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
1833b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_A, iq->qchase.qclass)) {
1834b7579f77SDag-Erling Smørgrav 				*num = query_count;
1835b7579f77SDag-Erling Smørgrav 				if(query_count > 0)
1836b7579f77SDag-Erling Smørgrav 					qstate->ext_state[id] = module_wait_subquery;
1837b7579f77SDag-Erling Smørgrav 				return 0;
1838b7579f77SDag-Erling Smørgrav 			}
1839b7579f77SDag-Erling Smørgrav 			query_count++;
1840b7579f77SDag-Erling Smørgrav 		}
1841b7579f77SDag-Erling Smørgrav 
1842b7579f77SDag-Erling Smørgrav 		/* mark this target as in progress. */
1843b7579f77SDag-Erling Smørgrav 		ns->resolved = 1;
1844b7579f77SDag-Erling Smørgrav 		missing--;
1845b7579f77SDag-Erling Smørgrav 		toget--;
1846b7579f77SDag-Erling Smørgrav 		if(toget == 0)
1847b7579f77SDag-Erling Smørgrav 			break;
1848b7579f77SDag-Erling Smørgrav 	}
1849b7579f77SDag-Erling Smørgrav 	*num = query_count;
1850b7579f77SDag-Erling Smørgrav 	if(query_count > 0)
1851b7579f77SDag-Erling Smørgrav 		qstate->ext_state[id] = module_wait_subquery;
1852b7579f77SDag-Erling Smørgrav 
1853b7579f77SDag-Erling Smørgrav 	return 1;
1854b7579f77SDag-Erling Smørgrav }
1855b7579f77SDag-Erling Smørgrav 
1856b7579f77SDag-Erling Smørgrav /**
1857b7579f77SDag-Erling Smørgrav  * Called by processQueryTargets when it would like extra targets to query
1858b7579f77SDag-Erling Smørgrav  * but it seems to be out of options.  At last resort some less appealing
1859b7579f77SDag-Erling Smørgrav  * options are explored.  If there are no more options, the result is SERVFAIL
1860b7579f77SDag-Erling Smørgrav  *
1861b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1862b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1863b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
1864b7579f77SDag-Erling Smørgrav  * @param id: module id.
1865b7579f77SDag-Erling Smørgrav  * @return true if the event requires more request processing immediately,
1866b7579f77SDag-Erling Smørgrav  *         false if not.
1867b7579f77SDag-Erling Smørgrav  */
1868b7579f77SDag-Erling Smørgrav static int
1869b7579f77SDag-Erling Smørgrav processLastResort(struct module_qstate* qstate, struct iter_qstate* iq,
1870b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
1871b7579f77SDag-Erling Smørgrav {
1872b7579f77SDag-Erling Smørgrav 	struct delegpt_ns* ns;
1873b7579f77SDag-Erling Smørgrav 	int query_count = 0;
1874b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "No more query targets, attempting last resort");
1875b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
1876b7579f77SDag-Erling Smørgrav 
1877c7f4d7adSDag-Erling Smørgrav 	if(!can_have_last_resort(qstate->env, iq->dp->name, iq->dp->namelen,
18787da0adf7SDag-Erling Smørgrav 		iq->qchase.qclass, NULL)) {
187917d15b25SDag-Erling Smørgrav 		/* fail -- no more targets, no more hope of targets, no hope
188017d15b25SDag-Erling Smørgrav 		 * of a response. */
18814c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "all the configured stub or forward servers failed,");
18824c75e3aaSDag-Erling Smørgrav 		errinf_dname(qstate, "at zone", iq->dp->name);
1883c7f4d7adSDag-Erling Smørgrav 		verbose(VERB_QUERY, "configured stub or forward servers failed -- returning SERVFAIL");
188417d15b25SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
188517d15b25SDag-Erling Smørgrav 	}
18868ed2b524SDag-Erling Smørgrav 	if(!iq->dp->has_parent_side_NS && dname_is_root(iq->dp->name)) {
18878ed2b524SDag-Erling Smørgrav 		struct delegpt* p = hints_lookup_root(qstate->env->hints,
18888ed2b524SDag-Erling Smørgrav 			iq->qchase.qclass);
18898ed2b524SDag-Erling Smørgrav 		if(p) {
18908ed2b524SDag-Erling Smørgrav 			struct delegpt_addr* a;
18918ed2b524SDag-Erling Smørgrav 			iq->chase_flags &= ~BIT_RD; /* go to authorities */
18928ed2b524SDag-Erling Smørgrav 			for(ns = p->nslist; ns; ns=ns->next) {
18938ed2b524SDag-Erling Smørgrav 				(void)delegpt_add_ns(iq->dp, qstate->region,
189417d15b25SDag-Erling Smørgrav 					ns->name, ns->lame);
18958ed2b524SDag-Erling Smørgrav 			}
18968ed2b524SDag-Erling Smørgrav 			for(a = p->target_list; a; a=a->next_target) {
18978ed2b524SDag-Erling Smørgrav 				(void)delegpt_add_addr(iq->dp, qstate->region,
18988ed2b524SDag-Erling Smørgrav 					&a->addr, a->addrlen, a->bogus,
18990fb34990SDag-Erling Smørgrav 					a->lame, a->tls_auth_name);
19008ed2b524SDag-Erling Smørgrav 			}
19018ed2b524SDag-Erling Smørgrav 		}
19028ed2b524SDag-Erling Smørgrav 		iq->dp->has_parent_side_NS = 1;
19038ed2b524SDag-Erling Smørgrav 	} else if(!iq->dp->has_parent_side_NS) {
1904b7579f77SDag-Erling Smørgrav 		if(!iter_lookup_parent_NS_from_cache(qstate->env, iq->dp,
1905b7579f77SDag-Erling Smørgrav 			qstate->region, &qstate->qinfo)
1906b7579f77SDag-Erling Smørgrav 			|| !iq->dp->has_parent_side_NS) {
1907b7579f77SDag-Erling Smørgrav 			/* if: malloc failure in lookup go up to try */
1908b7579f77SDag-Erling Smørgrav 			/* if: no parent NS in cache - go up one level */
1909b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "try to grab parent NS");
1910b7579f77SDag-Erling Smørgrav 			iq->store_parent_NS = iq->dp;
19118ed2b524SDag-Erling Smørgrav 			iq->chase_flags &= ~BIT_RD; /* go to authorities */
1912b7579f77SDag-Erling Smørgrav 			iq->deleg_msg = NULL;
1913b7579f77SDag-Erling Smørgrav 			iq->refetch_glue = 1;
1914b7579f77SDag-Erling Smørgrav 			iq->query_restart_count++;
1915b7579f77SDag-Erling Smørgrav 			iq->sent_count = 0;
191605ab2901SDag-Erling Smørgrav 			if(qstate->env->cfg->qname_minimisation)
191705ab2901SDag-Erling Smørgrav 				iq->minimisation_state = INIT_MINIMISE_STATE;
1918b7579f77SDag-Erling Smørgrav 			return next_state(iq, INIT_REQUEST_STATE);
1919b7579f77SDag-Erling Smørgrav 		}
1920b7579f77SDag-Erling Smørgrav 	}
1921b7579f77SDag-Erling Smørgrav 	/* see if that makes new names available */
1922b7579f77SDag-Erling Smørgrav 	if(!cache_fill_missing(qstate->env, iq->qchase.qclass,
1923b7579f77SDag-Erling Smørgrav 		qstate->region, iq->dp))
1924b7579f77SDag-Erling Smørgrav 		log_err("out of memory in cache_fill_missing");
1925b7579f77SDag-Erling Smørgrav 	if(iq->dp->usable_list) {
1926b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "try parent-side-name, w. glue from cache");
1927b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
1928b7579f77SDag-Erling Smørgrav 	}
1929b7579f77SDag-Erling Smørgrav 	/* try to fill out parent glue from cache */
1930b7579f77SDag-Erling Smørgrav 	if(iter_lookup_parent_glue_from_cache(qstate->env, iq->dp,
1931b7579f77SDag-Erling Smørgrav 		qstate->region, &qstate->qinfo)) {
1932b7579f77SDag-Erling Smørgrav 		/* got parent stuff from cache, see if we can continue */
1933b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "try parent-side glue from cache");
1934b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
1935b7579f77SDag-Erling Smørgrav 	}
1936b7579f77SDag-Erling Smørgrav 	/* query for an extra name added by the parent-NS record */
1937b7579f77SDag-Erling Smørgrav 	if(delegpt_count_missing_targets(iq->dp) > 0) {
1938b7579f77SDag-Erling Smørgrav 		int qs = 0;
1939b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "try parent-side target name");
1940b7579f77SDag-Erling Smørgrav 		if(!query_for_targets(qstate, iq, ie, id, 1, &qs)) {
19414c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "could not fetch nameserver");
19424c75e3aaSDag-Erling Smørgrav 			errinf_dname(qstate, "at zone", iq->dp->name);
1943b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1944b7579f77SDag-Erling Smørgrav 		}
1945b7579f77SDag-Erling Smørgrav 		iq->num_target_queries += qs;
194652df462fSXin LI 		target_count_increase(iq, qs);
1947b7579f77SDag-Erling Smørgrav 		if(qs != 0) {
1948b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_subquery;
1949b7579f77SDag-Erling Smørgrav 			return 0; /* and wait for them */
1950b7579f77SDag-Erling Smørgrav 		}
1951b7579f77SDag-Erling Smørgrav 	}
1952b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth) {
1953b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "maxdepth and need more nameservers, fail");
19544c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "cannot fetch more nameservers because at max dependency depth");
1955b7579f77SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
1956b7579f77SDag-Erling Smørgrav 	}
195752df462fSXin LI 	if(iq->depth > 0 && iq->target_count &&
195852df462fSXin LI 		iq->target_count[1] > MAX_TARGET_COUNT) {
19596480faa8SDag-Erling Smørgrav 		char s[LDNS_MAX_DOMAINLEN+1];
19606480faa8SDag-Erling Smørgrav 		dname_str(qstate->qinfo.qname, s);
19616480faa8SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request %s has exceeded the maximum "
19626480faa8SDag-Erling Smørgrav 			"number of glue fetches %d", s, iq->target_count[1]);
19634c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "exceeded the maximum number of glue fetches");
196452df462fSXin LI 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
196552df462fSXin LI 	}
1966b7579f77SDag-Erling Smørgrav 	/* mark cycle targets for parent-side lookups */
1967b7579f77SDag-Erling Smørgrav 	iter_mark_pside_cycle_targets(qstate, iq->dp);
1968b7579f77SDag-Erling Smørgrav 	/* see if we can issue queries to get nameserver addresses */
1969b7579f77SDag-Erling Smørgrav 	/* this lookup is not randomized, but sequential. */
1970b7579f77SDag-Erling Smørgrav 	for(ns = iq->dp->nslist; ns; ns = ns->next) {
1971c7f4d7adSDag-Erling Smørgrav 		/* if this nameserver is at a delegation point, but that
1972c7f4d7adSDag-Erling Smørgrav 		 * delegation point is a stub and we cannot go higher, skip*/
1973c7f4d7adSDag-Erling Smørgrav 		if( ((ie->supports_ipv6 && !ns->done_pside6) ||
1974c7f4d7adSDag-Erling Smørgrav 		    (ie->supports_ipv4 && !ns->done_pside4)) &&
1975c7f4d7adSDag-Erling Smørgrav 		    !can_have_last_resort(qstate->env, ns->name, ns->namelen,
19767da0adf7SDag-Erling Smørgrav 			iq->qchase.qclass, NULL)) {
1977c7f4d7adSDag-Erling Smørgrav 			log_nametypeclass(VERB_ALGO, "cannot pside lookup ns "
1978c7f4d7adSDag-Erling Smørgrav 				"because it is also a stub/forward,",
1979c7f4d7adSDag-Erling Smørgrav 				ns->name, LDNS_RR_TYPE_NS, iq->qchase.qclass);
1980c7f4d7adSDag-Erling Smørgrav 			if(ie->supports_ipv6) ns->done_pside6 = 1;
1981c7f4d7adSDag-Erling Smørgrav 			if(ie->supports_ipv4) ns->done_pside4 = 1;
1982c7f4d7adSDag-Erling Smørgrav 			continue;
1983c7f4d7adSDag-Erling Smørgrav 		}
1984b7579f77SDag-Erling Smørgrav 		/* query for parent-side A and AAAA for nameservers */
1985b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv6 && !ns->done_pside6) {
1986b7579f77SDag-Erling Smørgrav 			/* Send the AAAA request. */
1987b7579f77SDag-Erling Smørgrav 			if(!generate_parentside_target_query(qstate, iq, id,
1988b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
19894c75e3aaSDag-Erling Smørgrav 				LDNS_RR_TYPE_AAAA, iq->qchase.qclass)) {
19904c75e3aaSDag-Erling Smørgrav 				errinf_dname(qstate, "could not generate nameserver AAAA lookup for", ns->name);
1991b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1992b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
19934c75e3aaSDag-Erling Smørgrav 			}
1994b7579f77SDag-Erling Smørgrav 			ns->done_pside6 = 1;
1995b7579f77SDag-Erling Smørgrav 			query_count++;
1996b7579f77SDag-Erling Smørgrav 		}
1997b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv4 && !ns->done_pside4) {
1998b7579f77SDag-Erling Smørgrav 			/* Send the A request. */
1999b7579f77SDag-Erling Smørgrav 			if(!generate_parentside_target_query(qstate, iq, id,
2000b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
20014c75e3aaSDag-Erling Smørgrav 				LDNS_RR_TYPE_A, iq->qchase.qclass)) {
20024c75e3aaSDag-Erling Smørgrav 				errinf_dname(qstate, "could not generate nameserver A lookup for", ns->name);
2003b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
2004b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
20054c75e3aaSDag-Erling Smørgrav 			}
2006b7579f77SDag-Erling Smørgrav 			ns->done_pside4 = 1;
2007b7579f77SDag-Erling Smørgrav 			query_count++;
2008b7579f77SDag-Erling Smørgrav 		}
2009b7579f77SDag-Erling Smørgrav 		if(query_count != 0) { /* suspend to await results */
2010b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "try parent-side glue lookup");
2011b7579f77SDag-Erling Smørgrav 			iq->num_target_queries += query_count;
201252df462fSXin LI 			target_count_increase(iq, query_count);
2013b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_subquery;
2014b7579f77SDag-Erling Smørgrav 			return 0;
2015b7579f77SDag-Erling Smørgrav 		}
2016b7579f77SDag-Erling Smørgrav 	}
2017b7579f77SDag-Erling Smørgrav 
2018b7579f77SDag-Erling Smørgrav 	/* if this was a parent-side glue query itself, then store that
2019b7579f77SDag-Erling Smørgrav 	 * failure in cache. */
2020bc892140SDag-Erling Smørgrav 	if(!qstate->no_cache_store && iq->query_for_pside_glue
2021bc892140SDag-Erling Smørgrav 		&& !iq->pside_glue)
2022b7579f77SDag-Erling Smørgrav 			iter_store_parentside_neg(qstate->env, &qstate->qinfo,
2023b7579f77SDag-Erling Smørgrav 				iq->deleg_msg?iq->deleg_msg->rep:
2024b7579f77SDag-Erling Smørgrav 				(iq->response?iq->response->rep:NULL));
2025b7579f77SDag-Erling Smørgrav 
20264c75e3aaSDag-Erling Smørgrav 	errinf(qstate, "all servers for this domain failed,");
20274c75e3aaSDag-Erling Smørgrav 	errinf_dname(qstate, "at zone", iq->dp->name);
2028b7579f77SDag-Erling Smørgrav 	verbose(VERB_QUERY, "out of query targets -- returning SERVFAIL");
2029b7579f77SDag-Erling Smørgrav 	/* fail -- no more targets, no more hope of targets, no hope
2030b7579f77SDag-Erling Smørgrav 	 * of a response. */
2031b7579f77SDag-Erling Smørgrav 	return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
2032b7579f77SDag-Erling Smørgrav }
2033b7579f77SDag-Erling Smørgrav 
2034b7579f77SDag-Erling Smørgrav /**
2035b7579f77SDag-Erling Smørgrav  * Try to find the NS record set that will resolve a qtype DS query. Due
2036b7579f77SDag-Erling Smørgrav  * to grandparent/grandchild reasons we did not get a proper lookup right
2037b7579f77SDag-Erling Smørgrav  * away.  We need to create type NS queries until we get the right parent
2038b7579f77SDag-Erling Smørgrav  * for this lookup.  We remove labels from the query to find the right point.
2039b7579f77SDag-Erling Smørgrav  * If we end up at the old dp name, then there is no solution.
2040b7579f77SDag-Erling Smørgrav  *
2041b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2042b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
2043b7579f77SDag-Erling Smørgrav  * @param id: module id.
2044b7579f77SDag-Erling Smørgrav  * @return true if the event requires more immediate processing, false if
2045b7579f77SDag-Erling Smørgrav  *         not. This is generally only true when forwarding the request to
2046b7579f77SDag-Erling Smørgrav  *         the final state (i.e., on answer).
2047b7579f77SDag-Erling Smørgrav  */
2048b7579f77SDag-Erling Smørgrav static int
20498ed2b524SDag-Erling Smørgrav processDSNSFind(struct module_qstate* qstate, struct iter_qstate* iq, int id)
2050b7579f77SDag-Erling Smørgrav {
2051b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq = NULL;
2052b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "processDSNSFind");
2053b7579f77SDag-Erling Smørgrav 
2054b7579f77SDag-Erling Smørgrav 	if(!iq->dsns_point) {
2055b7579f77SDag-Erling Smørgrav 		/* initialize */
2056b7579f77SDag-Erling Smørgrav 		iq->dsns_point = iq->qchase.qname;
2057b7579f77SDag-Erling Smørgrav 		iq->dsns_point_len = iq->qchase.qname_len;
2058b7579f77SDag-Erling Smørgrav 	}
2059b7579f77SDag-Erling Smørgrav 	/* robustcheck for internal error: we are not underneath the dp */
2060b7579f77SDag-Erling Smørgrav 	if(!dname_subdomain_c(iq->dsns_point, iq->dp->name)) {
20614c75e3aaSDag-Erling Smørgrav 		errinf_dname(qstate, "for DS query parent-child nameserver search the query is not under the zone", iq->dp->name);
2062b7579f77SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
2063b7579f77SDag-Erling Smørgrav 	}
2064b7579f77SDag-Erling Smørgrav 
2065b7579f77SDag-Erling Smørgrav 	/* go up one (more) step, until we hit the dp, if so, end */
2066b7579f77SDag-Erling Smørgrav 	dname_remove_label(&iq->dsns_point, &iq->dsns_point_len);
2067b7579f77SDag-Erling Smørgrav 	if(query_dname_compare(iq->dsns_point, iq->dp->name) == 0) {
2068b7579f77SDag-Erling Smørgrav 		/* there was no inbetween nameserver, use the old delegation
2069b7579f77SDag-Erling Smørgrav 		 * point again.  And this time, because dsns_point is nonNULL
2070b7579f77SDag-Erling Smørgrav 		 * we are going to accept the (bad) result */
2071b7579f77SDag-Erling Smørgrav 		iq->state = QUERYTARGETS_STATE;
2072b7579f77SDag-Erling Smørgrav 		return 1;
2073b7579f77SDag-Erling Smørgrav 	}
2074b7579f77SDag-Erling Smørgrav 	iq->state = DSNS_FIND_STATE;
2075b7579f77SDag-Erling Smørgrav 
2076b7579f77SDag-Erling Smørgrav 	/* spawn NS lookup (validation not needed, this is for DS lookup) */
2077b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_ALGO, "fetch nameservers",
2078b7579f77SDag-Erling Smørgrav 		iq->dsns_point, LDNS_RR_TYPE_NS, iq->qchase.qclass);
2079b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(iq->dsns_point, iq->dsns_point_len,
2080b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, iq->qchase.qclass, qstate, id, iq,
2081b7579f77SDag-Erling Smørgrav 		INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0)) {
20824c75e3aaSDag-Erling Smørgrav 		errinf_dname(qstate, "for DS query parent-child nameserver search, could not generate NS lookup for", iq->dsns_point);
2083b7579f77SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
2084b7579f77SDag-Erling Smørgrav 	}
2085b7579f77SDag-Erling Smørgrav 
2086b7579f77SDag-Erling Smørgrav 	return 0;
2087b7579f77SDag-Erling Smørgrav }
2088b7579f77SDag-Erling Smørgrav 
2089b7579f77SDag-Erling Smørgrav /**
2090b7579f77SDag-Erling Smørgrav  * This is the request event state where the request will be sent to one of
2091b7579f77SDag-Erling Smørgrav  * its current query targets. This state also handles issuing target lookup
2092b7579f77SDag-Erling Smørgrav  * queries for missing target IP addresses. Queries typically iterate on
2093b7579f77SDag-Erling Smørgrav  * this state, both when they are just trying different targets for a given
2094b7579f77SDag-Erling Smørgrav  * delegation point, and when they change delegation points. This state
2095b7579f77SDag-Erling Smørgrav  * roughly corresponds to RFC 1034 algorithm steps 3 and 4.
2096b7579f77SDag-Erling Smørgrav  *
2097b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2098b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
2099b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
2100b7579f77SDag-Erling Smørgrav  * @param id: module id.
2101b7579f77SDag-Erling Smørgrav  * @return true if the event requires more request processing immediately,
2102b7579f77SDag-Erling Smørgrav  *         false if not. This state only returns true when it is generating
2103b7579f77SDag-Erling Smørgrav  *         a SERVFAIL response because the query has hit a dead end.
2104b7579f77SDag-Erling Smørgrav  */
2105b7579f77SDag-Erling Smørgrav static int
2106b7579f77SDag-Erling Smørgrav processQueryTargets(struct module_qstate* qstate, struct iter_qstate* iq,
2107b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
2108b7579f77SDag-Erling Smørgrav {
2109b7579f77SDag-Erling Smørgrav 	int tf_policy;
2110b7579f77SDag-Erling Smørgrav 	struct delegpt_addr* target;
2111b7579f77SDag-Erling Smørgrav 	struct outbound_entry* outq;
211257bddd21SDag-Erling Smørgrav 	int auth_fallback = 0;
2113e86b9096SDag-Erling Smørgrav 	uint8_t* qout_orig = NULL;
2114e86b9096SDag-Erling Smørgrav 	size_t qout_orig_len = 0;
2115b7579f77SDag-Erling Smørgrav 
2116b7579f77SDag-Erling Smørgrav 	/* NOTE: a request will encounter this state for each target it
2117b7579f77SDag-Erling Smørgrav 	 * needs to send a query to. That is, at least one per referral,
2118b7579f77SDag-Erling Smørgrav 	 * more if some targets timeout or return throwaway answers. */
2119b7579f77SDag-Erling Smørgrav 
2120b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "processQueryTargets:", &qstate->qinfo);
2121b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "processQueryTargets: targetqueries %d, "
2122b7579f77SDag-Erling Smørgrav 		"currentqueries %d sentcount %d", iq->num_target_queries,
2123b7579f77SDag-Erling Smørgrav 		iq->num_current_queries, iq->sent_count);
2124b7579f77SDag-Erling Smørgrav 
2125b7579f77SDag-Erling Smørgrav 	/* Make sure that we haven't run away */
2126b7579f77SDag-Erling Smørgrav 	/* FIXME: is this check even necessary? */
2127b7579f77SDag-Erling Smørgrav 	if(iq->referral_count > MAX_REFERRAL_COUNT) {
2128b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum "
2129b7579f77SDag-Erling Smørgrav 			"number of referrrals with %d", iq->referral_count);
21304c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "exceeded the maximum of referrals");
2131b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2132b7579f77SDag-Erling Smørgrav 	}
2133b7579f77SDag-Erling Smørgrav 	if(iq->sent_count > MAX_SENT_COUNT) {
2134b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum "
2135b7579f77SDag-Erling Smørgrav 			"number of sends with %d", iq->sent_count);
21364c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "exceeded the maximum number of sends");
2137b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2138b7579f77SDag-Erling Smørgrav 	}
2139b7579f77SDag-Erling Smørgrav 
2140b7579f77SDag-Erling Smørgrav 	/* Make sure we have a delegation point, otherwise priming failed
2141b7579f77SDag-Erling Smørgrav 	 * or another failure occurred */
2142b7579f77SDag-Erling Smørgrav 	if(!iq->dp) {
2143b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "Failed to get a delegation, giving up");
21444c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "failed to get a delegation (eg. prime failure)");
2145b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2146b7579f77SDag-Erling Smørgrav 	}
2147b7579f77SDag-Erling Smørgrav 	if(!ie->supports_ipv6)
2148b7579f77SDag-Erling Smørgrav 		delegpt_no_ipv6(iq->dp);
2149b7579f77SDag-Erling Smørgrav 	if(!ie->supports_ipv4)
2150b7579f77SDag-Erling Smørgrav 		delegpt_no_ipv4(iq->dp);
2151b7579f77SDag-Erling Smørgrav 	delegpt_log(VERB_ALGO, iq->dp);
2152b7579f77SDag-Erling Smørgrav 
2153b7579f77SDag-Erling Smørgrav 	if(iq->num_current_queries>0) {
2154b7579f77SDag-Erling Smørgrav 		/* already busy answering a query, this restart is because
2155b7579f77SDag-Erling Smørgrav 		 * more delegpt addrs became available, wait for existing
2156b7579f77SDag-Erling Smørgrav 		 * query. */
2157b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "woke up, but wait for outstanding query");
2158b7579f77SDag-Erling Smørgrav 		qstate->ext_state[id] = module_wait_reply;
2159b7579f77SDag-Erling Smørgrav 		return 0;
2160b7579f77SDag-Erling Smørgrav 	}
2161b7579f77SDag-Erling Smørgrav 
2162a755b6f6SDag-Erling Smørgrav 	if(iq->minimisation_state == INIT_MINIMISE_STATE
2163a755b6f6SDag-Erling Smørgrav 		&& !(iq->chase_flags & BIT_RD)) {
216457bddd21SDag-Erling Smørgrav 		/* (Re)set qinfo_out to (new) delegation point, except when
216557bddd21SDag-Erling Smørgrav 		 * qinfo_out is already a subdomain of dp. This happens when
216657bddd21SDag-Erling Smørgrav 		 * increasing by more than one label at once (QNAMEs with more
216757bddd21SDag-Erling Smørgrav 		 * than MAX_MINIMISE_COUNT labels). */
216857bddd21SDag-Erling Smørgrav 		if(!(iq->qinfo_out.qname_len
216957bddd21SDag-Erling Smørgrav 			&& dname_subdomain_c(iq->qchase.qname,
217057bddd21SDag-Erling Smørgrav 				iq->qinfo_out.qname)
217157bddd21SDag-Erling Smørgrav 			&& dname_subdomain_c(iq->qinfo_out.qname,
217257bddd21SDag-Erling Smørgrav 				iq->dp->name))) {
217357bddd21SDag-Erling Smørgrav 			iq->qinfo_out.qname = iq->dp->name;
217457bddd21SDag-Erling Smørgrav 			iq->qinfo_out.qname_len = iq->dp->namelen;
217557bddd21SDag-Erling Smørgrav 			iq->qinfo_out.qtype = LDNS_RR_TYPE_A;
217657bddd21SDag-Erling Smørgrav 			iq->qinfo_out.qclass = iq->qchase.qclass;
217757bddd21SDag-Erling Smørgrav 			iq->qinfo_out.local_alias = NULL;
217857bddd21SDag-Erling Smørgrav 			iq->minimise_count = 0;
217957bddd21SDag-Erling Smørgrav 		}
218057bddd21SDag-Erling Smørgrav 
218157bddd21SDag-Erling Smørgrav 		iq->minimisation_state = MINIMISE_STATE;
218257bddd21SDag-Erling Smørgrav 	}
218357bddd21SDag-Erling Smørgrav 	if(iq->minimisation_state == MINIMISE_STATE) {
218457bddd21SDag-Erling Smørgrav 		int qchaselabs = dname_count_labels(iq->qchase.qname);
218557bddd21SDag-Erling Smørgrav 		int labdiff = qchaselabs -
218657bddd21SDag-Erling Smørgrav 			dname_count_labels(iq->qinfo_out.qname);
218757bddd21SDag-Erling Smørgrav 
2188e86b9096SDag-Erling Smørgrav 		qout_orig = iq->qinfo_out.qname;
2189e86b9096SDag-Erling Smørgrav 		qout_orig_len = iq->qinfo_out.qname_len;
219057bddd21SDag-Erling Smørgrav 		iq->qinfo_out.qname = iq->qchase.qname;
219157bddd21SDag-Erling Smørgrav 		iq->qinfo_out.qname_len = iq->qchase.qname_len;
219257bddd21SDag-Erling Smørgrav 		iq->minimise_count++;
219357bddd21SDag-Erling Smørgrav 		iq->minimise_timeout_count = 0;
219457bddd21SDag-Erling Smørgrav 
219557bddd21SDag-Erling Smørgrav 		iter_dec_attempts(iq->dp, 1);
219657bddd21SDag-Erling Smørgrav 
219757bddd21SDag-Erling Smørgrav 		/* Limit number of iterations for QNAMEs with more
219857bddd21SDag-Erling Smørgrav 		 * than MAX_MINIMISE_COUNT labels. Send first MINIMISE_ONE_LAB
219957bddd21SDag-Erling Smørgrav 		 * labels of QNAME always individually.
220057bddd21SDag-Erling Smørgrav 		 */
220157bddd21SDag-Erling Smørgrav 		if(qchaselabs > MAX_MINIMISE_COUNT && labdiff > 1 &&
220257bddd21SDag-Erling Smørgrav 			iq->minimise_count > MINIMISE_ONE_LAB) {
220357bddd21SDag-Erling Smørgrav 			if(iq->minimise_count < MAX_MINIMISE_COUNT) {
220457bddd21SDag-Erling Smørgrav 				int multilabs = qchaselabs - 1 -
220557bddd21SDag-Erling Smørgrav 					MINIMISE_ONE_LAB;
220657bddd21SDag-Erling Smørgrav 				int extralabs = multilabs /
220757bddd21SDag-Erling Smørgrav 					MINIMISE_MULTIPLE_LABS;
220857bddd21SDag-Erling Smørgrav 
220957bddd21SDag-Erling Smørgrav 				if (MAX_MINIMISE_COUNT - iq->minimise_count >=
221057bddd21SDag-Erling Smørgrav 					multilabs % MINIMISE_MULTIPLE_LABS)
221157bddd21SDag-Erling Smørgrav 					/* Default behaviour is to add 1 label
221257bddd21SDag-Erling Smørgrav 					 * every iteration. Therefore, decrement
221357bddd21SDag-Erling Smørgrav 					 * the extralabs by 1 */
221457bddd21SDag-Erling Smørgrav 					extralabs--;
221557bddd21SDag-Erling Smørgrav 				if (extralabs < labdiff)
221657bddd21SDag-Erling Smørgrav 					labdiff -= extralabs;
221757bddd21SDag-Erling Smørgrav 				else
221857bddd21SDag-Erling Smørgrav 					labdiff = 1;
221957bddd21SDag-Erling Smørgrav 			}
222057bddd21SDag-Erling Smørgrav 			/* Last minimised iteration, send all labels with
222157bddd21SDag-Erling Smørgrav 			 * QTYPE=NS */
222257bddd21SDag-Erling Smørgrav 			else
222357bddd21SDag-Erling Smørgrav 				labdiff = 1;
222457bddd21SDag-Erling Smørgrav 		}
222557bddd21SDag-Erling Smørgrav 
222657bddd21SDag-Erling Smørgrav 		if(labdiff > 1) {
222757bddd21SDag-Erling Smørgrav 			verbose(VERB_QUERY, "removing %d labels", labdiff-1);
222857bddd21SDag-Erling Smørgrav 			dname_remove_labels(&iq->qinfo_out.qname,
222957bddd21SDag-Erling Smørgrav 				&iq->qinfo_out.qname_len,
223057bddd21SDag-Erling Smørgrav 				labdiff-1);
223157bddd21SDag-Erling Smørgrav 		}
223257bddd21SDag-Erling Smørgrav 		if(labdiff < 1 || (labdiff < 2
223357bddd21SDag-Erling Smørgrav 			&& (iq->qchase.qtype == LDNS_RR_TYPE_DS
223457bddd21SDag-Erling Smørgrav 			|| iq->qchase.qtype == LDNS_RR_TYPE_A)))
223557bddd21SDag-Erling Smørgrav 			/* Stop minimising this query, resolve "as usual" */
223657bddd21SDag-Erling Smørgrav 			iq->minimisation_state = DONOT_MINIMISE_STATE;
223757bddd21SDag-Erling Smørgrav 		else if(!qstate->no_cache_lookup) {
223857bddd21SDag-Erling Smørgrav 			struct dns_msg* msg = dns_cache_lookup(qstate->env,
223957bddd21SDag-Erling Smørgrav 				iq->qinfo_out.qname, iq->qinfo_out.qname_len,
224057bddd21SDag-Erling Smørgrav 				iq->qinfo_out.qtype, iq->qinfo_out.qclass,
224157bddd21SDag-Erling Smørgrav 				qstate->query_flags, qstate->region,
224257bddd21SDag-Erling Smørgrav 				qstate->env->scratch, 0);
224357bddd21SDag-Erling Smørgrav 			if(msg && msg->rep->an_numrrsets == 0
224457bddd21SDag-Erling Smørgrav 				&& FLAGS_GET_RCODE(msg->rep->flags) ==
224557bddd21SDag-Erling Smørgrav 				LDNS_RCODE_NOERROR)
224657bddd21SDag-Erling Smørgrav 				/* no need to send query if it is already
224757bddd21SDag-Erling Smørgrav 				 * cached as NOERROR/NODATA */
224857bddd21SDag-Erling Smørgrav 				return 1;
224957bddd21SDag-Erling Smørgrav 		}
225057bddd21SDag-Erling Smørgrav 	}
225157bddd21SDag-Erling Smørgrav 	if(iq->minimisation_state == SKIP_MINIMISE_STATE) {
225257bddd21SDag-Erling Smørgrav 		if(iq->minimise_timeout_count < MAX_MINIMISE_TIMEOUT_COUNT)
225357bddd21SDag-Erling Smørgrav 			/* Do not increment qname, continue incrementing next
225457bddd21SDag-Erling Smørgrav 			 * iteration */
225557bddd21SDag-Erling Smørgrav 			iq->minimisation_state = MINIMISE_STATE;
225657bddd21SDag-Erling Smørgrav 		else if(!qstate->env->cfg->qname_minimisation_strict)
225757bddd21SDag-Erling Smørgrav 			/* Too many time-outs detected for this QNAME and QTYPE.
225857bddd21SDag-Erling Smørgrav 			 * We give up, disable QNAME minimisation. */
225957bddd21SDag-Erling Smørgrav 			iq->minimisation_state = DONOT_MINIMISE_STATE;
226057bddd21SDag-Erling Smørgrav 	}
226157bddd21SDag-Erling Smørgrav 	if(iq->minimisation_state == DONOT_MINIMISE_STATE)
226257bddd21SDag-Erling Smørgrav 		iq->qinfo_out = iq->qchase;
226357bddd21SDag-Erling Smørgrav 
226457bddd21SDag-Erling Smørgrav 	/* now find an answer to this query */
226557bddd21SDag-Erling Smørgrav 	/* see if authority zones have an answer */
226657bddd21SDag-Erling Smørgrav 	/* now we know the dp, we can check the auth zone for locally hosted
226757bddd21SDag-Erling Smørgrav 	 * contents */
226857bddd21SDag-Erling Smørgrav 	if(!iq->auth_zone_avoid && qstate->blacklist) {
226957bddd21SDag-Erling Smørgrav 		if(auth_zones_can_fallback(qstate->env->auth_zones,
227057bddd21SDag-Erling Smørgrav 			iq->dp->name, iq->dp->namelen, iq->qinfo_out.qclass)) {
227157bddd21SDag-Erling Smørgrav 			/* if cache is blacklisted and this zone allows us
227257bddd21SDag-Erling Smørgrav 			 * to fallback to the internet, then do so, and
227357bddd21SDag-Erling Smørgrav 			 * fetch results from the internet servers */
227457bddd21SDag-Erling Smørgrav 			iq->auth_zone_avoid = 1;
227557bddd21SDag-Erling Smørgrav 		}
227657bddd21SDag-Erling Smørgrav 	}
227757bddd21SDag-Erling Smørgrav 	if(iq->auth_zone_avoid) {
227857bddd21SDag-Erling Smørgrav 		iq->auth_zone_avoid = 0;
227957bddd21SDag-Erling Smørgrav 		auth_fallback = 1;
228057bddd21SDag-Erling Smørgrav 	} else if(auth_zones_lookup(qstate->env->auth_zones, &iq->qinfo_out,
228157bddd21SDag-Erling Smørgrav 		qstate->region, &iq->response, &auth_fallback, iq->dp->name,
228257bddd21SDag-Erling Smørgrav 		iq->dp->namelen)) {
228357bddd21SDag-Erling Smørgrav 		/* use this as a response to be processed by the iterator */
228457bddd21SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO) {
228557bddd21SDag-Erling Smørgrav 			log_dns_msg("msg from auth zone",
228657bddd21SDag-Erling Smørgrav 				&iq->response->qinfo, iq->response->rep);
228757bddd21SDag-Erling Smørgrav 		}
22880fb34990SDag-Erling Smørgrav 		if((iq->chase_flags&BIT_RD) && !(iq->response->rep->flags&BIT_AA)) {
22890fb34990SDag-Erling Smørgrav 			verbose(VERB_ALGO, "forwarder, ignoring referral from auth zone");
22900fb34990SDag-Erling Smørgrav 		} else {
22910fb34990SDag-Erling Smørgrav 			lock_rw_wrlock(&qstate->env->auth_zones->lock);
22920fb34990SDag-Erling Smørgrav 			qstate->env->auth_zones->num_query_up++;
22930fb34990SDag-Erling Smørgrav 			lock_rw_unlock(&qstate->env->auth_zones->lock);
229457bddd21SDag-Erling Smørgrav 			iq->num_current_queries++;
229557bddd21SDag-Erling Smørgrav 			iq->chase_to_rd = 0;
229657bddd21SDag-Erling Smørgrav 			iq->dnssec_lame_query = 0;
229757bddd21SDag-Erling Smørgrav 			iq->auth_zone_response = 1;
229857bddd21SDag-Erling Smørgrav 			return next_state(iq, QUERY_RESP_STATE);
229957bddd21SDag-Erling Smørgrav 		}
23000fb34990SDag-Erling Smørgrav 	}
230157bddd21SDag-Erling Smørgrav 	iq->auth_zone_response = 0;
230257bddd21SDag-Erling Smørgrav 	if(auth_fallback == 0) {
230357bddd21SDag-Erling Smørgrav 		/* like we got servfail from the auth zone lookup, and
230457bddd21SDag-Erling Smørgrav 		 * no internet fallback */
230557bddd21SDag-Erling Smørgrav 		verbose(VERB_ALGO, "auth zone lookup failed, no fallback,"
230657bddd21SDag-Erling Smørgrav 			" servfail");
23074c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "auth zone lookup failed, fallback is off");
230857bddd21SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
230957bddd21SDag-Erling Smørgrav 	}
2310e86b9096SDag-Erling Smørgrav 	if(iq->dp->auth_dp) {
231157bddd21SDag-Erling Smørgrav 		/* we wanted to fallback, but had no delegpt, only the
231257bddd21SDag-Erling Smørgrav 		 * auth zone generated delegpt, create an actual one */
231357bddd21SDag-Erling Smørgrav 		iq->auth_zone_avoid = 1;
231457bddd21SDag-Erling Smørgrav 		return next_state(iq, INIT_REQUEST_STATE);
231557bddd21SDag-Erling Smørgrav 	}
231657bddd21SDag-Erling Smørgrav 	/* but mostly, fallback==1 (like, when no such auth zone exists)
231757bddd21SDag-Erling Smørgrav 	 * and we continue with lookups */
231857bddd21SDag-Erling Smørgrav 
2319b7579f77SDag-Erling Smørgrav 	tf_policy = 0;
2320b7579f77SDag-Erling Smørgrav 	/* < not <=, because although the array is large enough for <=, the
2321b7579f77SDag-Erling Smørgrav 	 * generated query will immediately be discarded due to depth and
2322b7579f77SDag-Erling Smørgrav 	 * that servfail is cached, which is not good as opportunism goes. */
2323b7579f77SDag-Erling Smørgrav 	if(iq->depth < ie->max_dependency_depth
2324b7579f77SDag-Erling Smørgrav 		&& iq->sent_count < TARGET_FETCH_STOP) {
2325b7579f77SDag-Erling Smørgrav 		tf_policy = ie->target_fetch_policy[iq->depth];
2326b7579f77SDag-Erling Smørgrav 	}
2327b7579f77SDag-Erling Smørgrav 
2328b7579f77SDag-Erling Smørgrav 	/* if in 0x20 fallback get as many targets as possible */
2329b7579f77SDag-Erling Smørgrav 	if(iq->caps_fallback) {
2330b7579f77SDag-Erling Smørgrav 		int extra = 0;
2331b7579f77SDag-Erling Smørgrav 		size_t naddr, nres, navail;
2332b7579f77SDag-Erling Smørgrav 		if(!query_for_targets(qstate, iq, ie, id, -1, &extra)) {
23334c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "could not fetch nameservers for 0x20 fallback");
2334b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2335b7579f77SDag-Erling Smørgrav 		}
2336b7579f77SDag-Erling Smørgrav 		iq->num_target_queries += extra;
233752df462fSXin LI 		target_count_increase(iq, extra);
2338b7579f77SDag-Erling Smørgrav 		if(iq->num_target_queries > 0) {
2339b7579f77SDag-Erling Smørgrav 			/* wait to get all targets, we want to try em */
2340b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "wait for all targets for fallback");
2341b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_reply;
2342e86b9096SDag-Erling Smørgrav 			/* undo qname minimise step because we'll get back here
2343e86b9096SDag-Erling Smørgrav 			 * to do it again */
2344e86b9096SDag-Erling Smørgrav 			if(qout_orig && iq->minimise_count > 0) {
2345e86b9096SDag-Erling Smørgrav 				iq->minimise_count--;
2346e86b9096SDag-Erling Smørgrav 				iq->qinfo_out.qname = qout_orig;
2347e86b9096SDag-Erling Smørgrav 				iq->qinfo_out.qname_len = qout_orig_len;
2348e86b9096SDag-Erling Smørgrav 			}
2349b7579f77SDag-Erling Smørgrav 			return 0;
2350b7579f77SDag-Erling Smørgrav 		}
2351b7579f77SDag-Erling Smørgrav 		/* did we do enough fallback queries already? */
2352b7579f77SDag-Erling Smørgrav 		delegpt_count_addr(iq->dp, &naddr, &nres, &navail);
2353b7579f77SDag-Erling Smørgrav 		/* the current caps_server is the number of fallbacks sent.
2354b7579f77SDag-Erling Smørgrav 		 * the original query is one that matched too, so we have
2355b7579f77SDag-Erling Smørgrav 		 * caps_server+1 number of matching queries now */
2356b7579f77SDag-Erling Smørgrav 		if(iq->caps_server+1 >= naddr*3 ||
235709a3aaf3SDag-Erling Smørgrav 			iq->caps_server*2+2 >= MAX_SENT_COUNT) {
235809a3aaf3SDag-Erling Smørgrav 			/* *2 on sentcount check because ipv6 may fail */
2359b7579f77SDag-Erling Smørgrav 			/* we're done, process the response */
2360b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "0x20 fallback had %d responses "
2361b7579f77SDag-Erling Smørgrav 				"match for %d wanted, done.",
2362b7579f77SDag-Erling Smørgrav 				(int)iq->caps_server+1, (int)naddr*3);
236309a3aaf3SDag-Erling Smørgrav 			iq->response = iq->caps_response;
2364b7579f77SDag-Erling Smørgrav 			iq->caps_fallback = 0;
2365b7579f77SDag-Erling Smørgrav 			iter_dec_attempts(iq->dp, 3); /* space for fallback */
2366b7579f77SDag-Erling Smørgrav 			iq->num_current_queries++; /* RespState decrements it*/
2367b7579f77SDag-Erling Smørgrav 			iq->referral_count++; /* make sure we don't loop */
2368b7579f77SDag-Erling Smørgrav 			iq->sent_count = 0;
2369b7579f77SDag-Erling Smørgrav 			iq->state = QUERY_RESP_STATE;
2370b7579f77SDag-Erling Smørgrav 			return 1;
2371b7579f77SDag-Erling Smørgrav 		}
2372b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "0x20 fallback number %d",
2373b7579f77SDag-Erling Smørgrav 			(int)iq->caps_server);
2374b7579f77SDag-Erling Smørgrav 
2375b7579f77SDag-Erling Smørgrav 	/* if there is a policy to fetch missing targets
2376b7579f77SDag-Erling Smørgrav 	 * opportunistically, do it. we rely on the fact that once a
2377b7579f77SDag-Erling Smørgrav 	 * query (or queries) for a missing name have been issued,
2378b7579f77SDag-Erling Smørgrav 	 * they will not show up again. */
2379b7579f77SDag-Erling Smørgrav 	} else if(tf_policy != 0) {
2380b7579f77SDag-Erling Smørgrav 		int extra = 0;
2381b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "attempt to get extra %d targets",
2382b7579f77SDag-Erling Smørgrav 			tf_policy);
2383b7579f77SDag-Erling Smørgrav 		(void)query_for_targets(qstate, iq, ie, id, tf_policy, &extra);
2384b7579f77SDag-Erling Smørgrav 		/* errors ignored, these targets are not strictly necessary for
2385b7579f77SDag-Erling Smørgrav 		 * this result, we do not have to reply with SERVFAIL */
2386b7579f77SDag-Erling Smørgrav 		iq->num_target_queries += extra;
238752df462fSXin LI 		target_count_increase(iq, extra);
2388b7579f77SDag-Erling Smørgrav 	}
2389b7579f77SDag-Erling Smørgrav 
2390b7579f77SDag-Erling Smørgrav 	/* Add the current set of unused targets to our queue. */
2391b7579f77SDag-Erling Smørgrav 	delegpt_add_unused_targets(iq->dp);
2392b7579f77SDag-Erling Smørgrav 
2393b7579f77SDag-Erling Smørgrav 	/* Select the next usable target, filtering out unsuitable targets. */
2394b7579f77SDag-Erling Smørgrav 	target = iter_server_selection(ie, qstate->env, iq->dp,
2395b7579f77SDag-Erling Smørgrav 		iq->dp->name, iq->dp->namelen, iq->qchase.qtype,
2396b7579f77SDag-Erling Smørgrav 		&iq->dnssec_lame_query, &iq->chase_to_rd,
23970fb34990SDag-Erling Smørgrav 		iq->num_target_queries, qstate->blacklist,
23980fb34990SDag-Erling Smørgrav 		qstate->prefetch_leeway);
2399b7579f77SDag-Erling Smørgrav 
2400b7579f77SDag-Erling Smørgrav 	/* If no usable target was selected... */
2401b7579f77SDag-Erling Smørgrav 	if(!target) {
2402b7579f77SDag-Erling Smørgrav 		/* Here we distinguish between three states: generate a new
2403b7579f77SDag-Erling Smørgrav 		 * target query, just wait, or quit (with a SERVFAIL).
2404b7579f77SDag-Erling Smørgrav 		 * We have the following information: number of active
2405b7579f77SDag-Erling Smørgrav 		 * target queries, number of active current queries,
2406b7579f77SDag-Erling Smørgrav 		 * the presence of missing targets at this delegation
2407b7579f77SDag-Erling Smørgrav 		 * point, and the given query target policy. */
2408b7579f77SDag-Erling Smørgrav 
2409b7579f77SDag-Erling Smørgrav 		/* Check for the wait condition. If this is true, then
2410b7579f77SDag-Erling Smørgrav 		 * an action must be taken. */
2411b7579f77SDag-Erling Smørgrav 		if(iq->num_target_queries==0 && iq->num_current_queries==0) {
2412b7579f77SDag-Erling Smørgrav 			/* If there is nothing to wait for, then we need
2413b7579f77SDag-Erling Smørgrav 			 * to distinguish between generating (a) new target
2414b7579f77SDag-Erling Smørgrav 			 * query, or failing. */
2415b7579f77SDag-Erling Smørgrav 			if(delegpt_count_missing_targets(iq->dp) > 0) {
2416b7579f77SDag-Erling Smørgrav 				int qs = 0;
2417b7579f77SDag-Erling Smørgrav 				verbose(VERB_ALGO, "querying for next "
2418b7579f77SDag-Erling Smørgrav 					"missing target");
2419b7579f77SDag-Erling Smørgrav 				if(!query_for_targets(qstate, iq, ie, id,
2420b7579f77SDag-Erling Smørgrav 					1, &qs)) {
24214c75e3aaSDag-Erling Smørgrav 					errinf(qstate, "could not fetch nameserver");
24224c75e3aaSDag-Erling Smørgrav 					errinf_dname(qstate, "at zone", iq->dp->name);
2423b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
2424b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
2425b7579f77SDag-Erling Smørgrav 				}
2426b7579f77SDag-Erling Smørgrav 				if(qs == 0 &&
2427b7579f77SDag-Erling Smørgrav 				   delegpt_count_missing_targets(iq->dp) == 0){
2428b7579f77SDag-Erling Smørgrav 					/* it looked like there were missing
2429b7579f77SDag-Erling Smørgrav 					 * targets, but they did not turn up.
2430b7579f77SDag-Erling Smørgrav 					 * Try the bad choices again (if any),
2431b7579f77SDag-Erling Smørgrav 					 * when we get back here missing==0,
2432b7579f77SDag-Erling Smørgrav 					 * so this is not a loop. */
2433b7579f77SDag-Erling Smørgrav 					return 1;
2434b7579f77SDag-Erling Smørgrav 				}
2435b7579f77SDag-Erling Smørgrav 				iq->num_target_queries += qs;
243652df462fSXin LI 				target_count_increase(iq, qs);
2437b7579f77SDag-Erling Smørgrav 			}
2438b7579f77SDag-Erling Smørgrav 			/* Since a target query might have been made, we
2439b7579f77SDag-Erling Smørgrav 			 * need to check again. */
2440b7579f77SDag-Erling Smørgrav 			if(iq->num_target_queries == 0) {
244109a3aaf3SDag-Erling Smørgrav 				/* if in capsforid fallback, instead of last
244209a3aaf3SDag-Erling Smørgrav 				 * resort, we agree with the current reply
244309a3aaf3SDag-Erling Smørgrav 				 * we have (if any) (our count of addrs bad)*/
244409a3aaf3SDag-Erling Smørgrav 				if(iq->caps_fallback && iq->caps_reply) {
244509a3aaf3SDag-Erling Smørgrav 					/* we're done, process the response */
244609a3aaf3SDag-Erling Smørgrav 					verbose(VERB_ALGO, "0x20 fallback had %d responses, "
244709a3aaf3SDag-Erling Smørgrav 						"but no more servers except "
244809a3aaf3SDag-Erling Smørgrav 						"last resort, done.",
244909a3aaf3SDag-Erling Smørgrav 						(int)iq->caps_server+1);
245009a3aaf3SDag-Erling Smørgrav 					iq->response = iq->caps_response;
245109a3aaf3SDag-Erling Smørgrav 					iq->caps_fallback = 0;
245209a3aaf3SDag-Erling Smørgrav 					iter_dec_attempts(iq->dp, 3); /* space for fallback */
245309a3aaf3SDag-Erling Smørgrav 					iq->num_current_queries++; /* RespState decrements it*/
245409a3aaf3SDag-Erling Smørgrav 					iq->referral_count++; /* make sure we don't loop */
245509a3aaf3SDag-Erling Smørgrav 					iq->sent_count = 0;
245609a3aaf3SDag-Erling Smørgrav 					iq->state = QUERY_RESP_STATE;
245709a3aaf3SDag-Erling Smørgrav 					return 1;
245809a3aaf3SDag-Erling Smørgrav 				}
2459b7579f77SDag-Erling Smørgrav 				return processLastResort(qstate, iq, ie, id);
2460b7579f77SDag-Erling Smørgrav 			}
2461b7579f77SDag-Erling Smørgrav 		}
2462b7579f77SDag-Erling Smørgrav 
2463b7579f77SDag-Erling Smørgrav 		/* otherwise, we have no current targets, so submerge
2464b7579f77SDag-Erling Smørgrav 		 * until one of the target or direct queries return. */
2465b7579f77SDag-Erling Smørgrav 		if(iq->num_target_queries>0 && iq->num_current_queries>0) {
2466b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "no current targets -- waiting "
2467b7579f77SDag-Erling Smørgrav 				"for %d targets to resolve or %d outstanding"
2468b7579f77SDag-Erling Smørgrav 				" queries to respond", iq->num_target_queries,
2469b7579f77SDag-Erling Smørgrav 				iq->num_current_queries);
2470b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_reply;
2471b7579f77SDag-Erling Smørgrav 		} else if(iq->num_target_queries>0) {
2472b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "no current targets -- waiting "
2473b7579f77SDag-Erling Smørgrav 				"for %d targets to resolve.",
2474b7579f77SDag-Erling Smørgrav 				iq->num_target_queries);
2475b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_subquery;
2476b7579f77SDag-Erling Smørgrav 		} else {
2477b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "no current targets -- waiting "
2478b7579f77SDag-Erling Smørgrav 				"for %d outstanding queries to respond.",
2479b7579f77SDag-Erling Smørgrav 				iq->num_current_queries);
2480b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_reply;
2481b7579f77SDag-Erling Smørgrav 		}
2482e86b9096SDag-Erling Smørgrav 		/* undo qname minimise step because we'll get back here
2483e86b9096SDag-Erling Smørgrav 		 * to do it again */
2484e86b9096SDag-Erling Smørgrav 		if(qout_orig && iq->minimise_count > 0) {
2485e86b9096SDag-Erling Smørgrav 			iq->minimise_count--;
2486e86b9096SDag-Erling Smørgrav 			iq->qinfo_out.qname = qout_orig;
2487e86b9096SDag-Erling Smørgrav 			iq->qinfo_out.qname_len = qout_orig_len;
2488e86b9096SDag-Erling Smørgrav 		}
2489b7579f77SDag-Erling Smørgrav 		return 0;
2490b7579f77SDag-Erling Smørgrav 	}
2491b7579f77SDag-Erling Smørgrav 
249209a3aaf3SDag-Erling Smørgrav 	/* if not forwarding, check ratelimits per delegationpoint name */
249309a3aaf3SDag-Erling Smørgrav 	if(!(iq->chase_flags & BIT_RD) && !iq->ratelimit_ok) {
249409a3aaf3SDag-Erling Smørgrav 		if(!infra_ratelimit_inc(qstate->env->infra_cache, iq->dp->name,
2495e86b9096SDag-Erling Smørgrav 			iq->dp->namelen, *qstate->env->now, &qstate->qinfo,
2496e86b9096SDag-Erling Smørgrav 			qstate->reply)) {
2497971980c3SDag-Erling Smørgrav 			lock_basic_lock(&ie->queries_ratelimit_lock);
2498971980c3SDag-Erling Smørgrav 			ie->num_queries_ratelimited++;
2499971980c3SDag-Erling Smørgrav 			lock_basic_unlock(&ie->queries_ratelimit_lock);
250009a3aaf3SDag-Erling Smørgrav 			verbose(VERB_ALGO, "query exceeded ratelimits");
25014c75e3aaSDag-Erling Smørgrav 			qstate->was_ratelimited = 1;
25024c75e3aaSDag-Erling Smørgrav 			errinf_dname(qstate, "exceeded ratelimit for zone",
25034c75e3aaSDag-Erling Smørgrav 				iq->dp->name);
250409a3aaf3SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
250509a3aaf3SDag-Erling Smørgrav 		}
250609a3aaf3SDag-Erling Smørgrav 	}
250709a3aaf3SDag-Erling Smørgrav 
2508b7579f77SDag-Erling Smørgrav 	/* We have a valid target. */
2509b7579f77SDag-Erling Smørgrav 	if(verbosity >= VERB_QUERY) {
251005ab2901SDag-Erling Smørgrav 		log_query_info(VERB_QUERY, "sending query:", &iq->qinfo_out);
2511b7579f77SDag-Erling Smørgrav 		log_name_addr(VERB_QUERY, "sending to target:", iq->dp->name,
2512b7579f77SDag-Erling Smørgrav 			&target->addr, target->addrlen);
2513b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "dnssec status: %s%s",
2514b7579f77SDag-Erling Smørgrav 			iq->dnssec_expected?"expected": "not expected",
2515b7579f77SDag-Erling Smørgrav 			iq->dnssec_lame_query?" but lame_query anyway": "");
2516b7579f77SDag-Erling Smørgrav 	}
2517b7579f77SDag-Erling Smørgrav 	fptr_ok(fptr_whitelist_modenv_send_query(qstate->env->send_query));
2518bc892140SDag-Erling Smørgrav 	outq = (*qstate->env->send_query)(&iq->qinfo_out,
2519e2d15004SDag-Erling Smørgrav 		iq->chase_flags | (iq->chase_to_rd?BIT_RD:0),
2520e2d15004SDag-Erling Smørgrav 		/* unset CD if to forwarder(RD set) and not dnssec retry
2521e2d15004SDag-Erling Smørgrav 		 * (blacklist nonempty) and no trust-anchors are configured
2522e2d15004SDag-Erling Smørgrav 		 * above the qname or on the first attempt when dnssec is on */
2523e2d15004SDag-Erling Smørgrav 		EDNS_DO| ((iq->chase_to_rd||(iq->chase_flags&BIT_RD)!=0)&&
25240fb34990SDag-Erling Smørgrav 		!qstate->blacklist&&(!iter_qname_indicates_dnssec(qstate->env,
2525e2d15004SDag-Erling Smørgrav 		&iq->qinfo_out)||target->attempts==1)?0:BIT_CD),
252609a3aaf3SDag-Erling Smørgrav 		iq->dnssec_expected, iq->caps_fallback || is_caps_whitelisted(
2527bc892140SDag-Erling Smørgrav 		ie, iq), &target->addr, target->addrlen,
2528bc892140SDag-Erling Smørgrav 		iq->dp->name, iq->dp->namelen,
25290fb34990SDag-Erling Smørgrav 		(iq->dp->ssl_upstream || qstate->env->cfg->ssl_upstream),
25300fb34990SDag-Erling Smørgrav 		target->tls_auth_name, qstate);
2531b7579f77SDag-Erling Smørgrav 	if(!outq) {
2532b7579f77SDag-Erling Smørgrav 		log_addr(VERB_DETAIL, "error sending query to auth server",
2533b7579f77SDag-Erling Smørgrav 			&target->addr, target->addrlen);
253409a3aaf3SDag-Erling Smørgrav 		if(!(iq->chase_flags & BIT_RD) && !iq->ratelimit_ok)
253509a3aaf3SDag-Erling Smørgrav 		    infra_ratelimit_dec(qstate->env->infra_cache, iq->dp->name,
253609a3aaf3SDag-Erling Smørgrav 			iq->dp->namelen, *qstate->env->now);
2537971980c3SDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation)
2538971980c3SDag-Erling Smørgrav 			iq->minimisation_state = SKIP_MINIMISE_STATE;
2539b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2540b7579f77SDag-Erling Smørgrav 	}
2541b7579f77SDag-Erling Smørgrav 	outbound_list_insert(&iq->outlist, outq);
2542b7579f77SDag-Erling Smørgrav 	iq->num_current_queries++;
2543b7579f77SDag-Erling Smørgrav 	iq->sent_count++;
2544b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_wait_reply;
2545b7579f77SDag-Erling Smørgrav 
2546b7579f77SDag-Erling Smørgrav 	return 0;
2547b7579f77SDag-Erling Smørgrav }
2548b7579f77SDag-Erling Smørgrav 
2549b7579f77SDag-Erling Smørgrav /** find NS rrset in given list */
2550b7579f77SDag-Erling Smørgrav static struct ub_packed_rrset_key*
2551b7579f77SDag-Erling Smørgrav find_NS(struct reply_info* rep, size_t from, size_t to)
2552b7579f77SDag-Erling Smørgrav {
2553b7579f77SDag-Erling Smørgrav 	size_t i;
2554b7579f77SDag-Erling Smørgrav 	for(i=from; i<to; i++) {
2555b7579f77SDag-Erling Smørgrav 		if(ntohs(rep->rrsets[i]->rk.type) == LDNS_RR_TYPE_NS)
2556b7579f77SDag-Erling Smørgrav 			return rep->rrsets[i];
2557b7579f77SDag-Erling Smørgrav 	}
2558b7579f77SDag-Erling Smørgrav 	return NULL;
2559b7579f77SDag-Erling Smørgrav }
2560b7579f77SDag-Erling Smørgrav 
2561b7579f77SDag-Erling Smørgrav 
2562b7579f77SDag-Erling Smørgrav /**
2563b7579f77SDag-Erling Smørgrav  * Process the query response. All queries end up at this state first. This
2564b7579f77SDag-Erling Smørgrav  * process generally consists of analyzing the response and routing the
2565b7579f77SDag-Erling Smørgrav  * event to the next state (either bouncing it back to a request state, or
2566b7579f77SDag-Erling Smørgrav  * terminating the processing for this event).
2567b7579f77SDag-Erling Smørgrav  *
2568b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2569b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
2570b7579f77SDag-Erling Smørgrav  * @param id: module id.
2571b7579f77SDag-Erling Smørgrav  * @return true if the event requires more immediate processing, false if
2572b7579f77SDag-Erling Smørgrav  *         not. This is generally only true when forwarding the request to
2573b7579f77SDag-Erling Smørgrav  *         the final state (i.e., on answer).
2574b7579f77SDag-Erling Smørgrav  */
2575b7579f77SDag-Erling Smørgrav static int
2576b7579f77SDag-Erling Smørgrav processQueryResponse(struct module_qstate* qstate, struct iter_qstate* iq,
2577b7579f77SDag-Erling Smørgrav 	int id)
2578b7579f77SDag-Erling Smørgrav {
2579b7579f77SDag-Erling Smørgrav 	int dnsseclame = 0;
2580b7579f77SDag-Erling Smørgrav 	enum response_type type;
2581b7579f77SDag-Erling Smørgrav 	iq->num_current_queries--;
258265b390aaSDag-Erling Smørgrav 
258365b390aaSDag-Erling Smørgrav 	if(!inplace_cb_query_response_call(qstate->env, qstate, iq->response))
258465b390aaSDag-Erling Smørgrav 		log_err("unable to call query_response callback");
258565b390aaSDag-Erling Smørgrav 
2586b7579f77SDag-Erling Smørgrav 	if(iq->response == NULL) {
258705ab2901SDag-Erling Smørgrav 		/* Don't increment qname when QNAME minimisation is enabled */
2588971980c3SDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation) {
2589971980c3SDag-Erling Smørgrav 			iq->minimise_timeout_count++;
259005ab2901SDag-Erling Smørgrav 			iq->minimisation_state = SKIP_MINIMISE_STATE;
2591971980c3SDag-Erling Smørgrav 		}
2592b7579f77SDag-Erling Smørgrav 		iq->chase_to_rd = 0;
2593b7579f77SDag-Erling Smørgrav 		iq->dnssec_lame_query = 0;
2594b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "query response was timeout");
2595b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2596b7579f77SDag-Erling Smørgrav 	}
2597b7579f77SDag-Erling Smørgrav 	type = response_type_from_server(
2598b7579f77SDag-Erling Smørgrav 		(int)((iq->chase_flags&BIT_RD) || iq->chase_to_rd),
25990fb34990SDag-Erling Smørgrav 		iq->response, &iq->qinfo_out, iq->dp);
2600b7579f77SDag-Erling Smørgrav 	iq->chase_to_rd = 0;
26010fb34990SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_REFERRAL && (iq->chase_flags&BIT_RD) &&
26020fb34990SDag-Erling Smørgrav 		!iq->auth_zone_response) {
2603b7579f77SDag-Erling Smørgrav 		/* When forwarding (RD bit is set), we handle referrals
2604b7579f77SDag-Erling Smørgrav 		 * differently. No queries should be sent elsewhere */
2605b7579f77SDag-Erling Smørgrav 		type = RESPONSE_TYPE_ANSWER;
2606b7579f77SDag-Erling Smørgrav 	}
2607e2d15004SDag-Erling Smørgrav 	if(!qstate->env->cfg->disable_dnssec_lame_check && iq->dnssec_expected
2608e2d15004SDag-Erling Smørgrav                 && !iq->dnssec_lame_query &&
2609b7579f77SDag-Erling Smørgrav 		!(iq->chase_flags&BIT_RD)
2610e2d15004SDag-Erling Smørgrav 		&& iq->sent_count < DNSSEC_LAME_DETECT_COUNT
2611b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_LAME
2612b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_REC_LAME
2613b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_THROWAWAY
2614b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_UNTYPED) {
2615b7579f77SDag-Erling Smørgrav 		/* a possible answer, see if it is missing DNSSEC */
2616b7579f77SDag-Erling Smørgrav 		/* but not when forwarding, so we dont mark fwder lame */
261717d15b25SDag-Erling Smørgrav 		if(!iter_msg_has_dnssec(iq->response)) {
261817d15b25SDag-Erling Smørgrav 			/* Mark this address as dnsseclame in this dp,
261917d15b25SDag-Erling Smørgrav 			 * because that will make serverselection disprefer
262017d15b25SDag-Erling Smørgrav 			 * it, but also, once it is the only final option,
262117d15b25SDag-Erling Smørgrav 			 * use dnssec-lame-bypass if it needs to query there.*/
262217d15b25SDag-Erling Smørgrav 			if(qstate->reply) {
262317d15b25SDag-Erling Smørgrav 				struct delegpt_addr* a = delegpt_find_addr(
262417d15b25SDag-Erling Smørgrav 					iq->dp, &qstate->reply->addr,
262517d15b25SDag-Erling Smørgrav 					qstate->reply->addrlen);
262617d15b25SDag-Erling Smørgrav 				if(a) a->dnsseclame = 1;
262717d15b25SDag-Erling Smørgrav 			}
262817d15b25SDag-Erling Smørgrav 			/* test the answer is from the zone we expected,
2629b7579f77SDag-Erling Smørgrav 		 	 * otherwise, (due to parent,child on same server), we
2630b7579f77SDag-Erling Smørgrav 		 	 * might mark the server,zone lame inappropriately */
263117d15b25SDag-Erling Smørgrav 			if(!iter_msg_from_zone(iq->response, iq->dp, type,
263217d15b25SDag-Erling Smørgrav 				iq->qchase.qclass))
263317d15b25SDag-Erling Smørgrav 				qstate->reply = NULL;
2634b7579f77SDag-Erling Smørgrav 			type = RESPONSE_TYPE_LAME;
2635b7579f77SDag-Erling Smørgrav 			dnsseclame = 1;
2636b7579f77SDag-Erling Smørgrav 		}
2637b7579f77SDag-Erling Smørgrav 	} else iq->dnssec_lame_query = 0;
2638b7579f77SDag-Erling Smørgrav 	/* see if referral brings us close to the target */
2639b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_REFERRAL) {
2640b7579f77SDag-Erling Smørgrav 		struct ub_packed_rrset_key* ns = find_NS(
2641b7579f77SDag-Erling Smørgrav 			iq->response->rep, iq->response->rep->an_numrrsets,
2642b7579f77SDag-Erling Smørgrav 			iq->response->rep->an_numrrsets
2643b7579f77SDag-Erling Smørgrav 			+ iq->response->rep->ns_numrrsets);
2644b7579f77SDag-Erling Smørgrav 		if(!ns) ns = find_NS(iq->response->rep, 0,
2645b7579f77SDag-Erling Smørgrav 				iq->response->rep->an_numrrsets);
2646b7579f77SDag-Erling Smørgrav 		if(!ns || !dname_strict_subdomain_c(ns->rk.dname, iq->dp->name)
2647b7579f77SDag-Erling Smørgrav 			|| !dname_subdomain_c(iq->qchase.qname, ns->rk.dname)){
2648b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "bad referral, throwaway");
2649b7579f77SDag-Erling Smørgrav 			type = RESPONSE_TYPE_THROWAWAY;
2650b7579f77SDag-Erling Smørgrav 		} else
2651b7579f77SDag-Erling Smørgrav 			iter_scrub_ds(iq->response, ns, iq->dp->name);
2652b7579f77SDag-Erling Smørgrav 	} else iter_scrub_ds(iq->response, NULL, NULL);
265365b390aaSDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_THROWAWAY &&
265465b390aaSDag-Erling Smørgrav 		FLAGS_GET_RCODE(iq->response->rep->flags) == LDNS_RCODE_YXDOMAIN) {
265565b390aaSDag-Erling Smørgrav 		/* YXDOMAIN is a permanent error, no need to retry */
265665b390aaSDag-Erling Smørgrav 		type = RESPONSE_TYPE_ANSWER;
265765b390aaSDag-Erling Smørgrav 	}
265865b390aaSDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_CNAME && iq->response->rep->an_numrrsets >= 1
265965b390aaSDag-Erling Smørgrav 		&& ntohs(iq->response->rep->rrsets[0]->rk.type) == LDNS_RR_TYPE_DNAME) {
266065b390aaSDag-Erling Smørgrav 		uint8_t* sname = NULL;
266165b390aaSDag-Erling Smørgrav 		size_t snamelen = 0;
266265b390aaSDag-Erling Smørgrav 		get_cname_target(iq->response->rep->rrsets[0], &sname,
266365b390aaSDag-Erling Smørgrav 			&snamelen);
266465b390aaSDag-Erling Smørgrav 		if(snamelen && dname_subdomain_c(sname, iq->response->rep->rrsets[0]->rk.dname)) {
266565b390aaSDag-Erling Smørgrav 			/* DNAME to a subdomain loop; do not recurse */
266665b390aaSDag-Erling Smørgrav 			type = RESPONSE_TYPE_ANSWER;
266765b390aaSDag-Erling Smørgrav 		}
26684c75e3aaSDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_CNAME &&
26694c75e3aaSDag-Erling Smørgrav 		iq->qchase.qtype == LDNS_RR_TYPE_CNAME &&
26704c75e3aaSDag-Erling Smørgrav 		iq->minimisation_state == MINIMISE_STATE &&
26714c75e3aaSDag-Erling Smørgrav 		query_dname_compare(iq->qchase.qname, iq->qinfo_out.qname) == 0) {
26724c75e3aaSDag-Erling Smørgrav 		/* The minimised query for full QTYPE and hidden QTYPE can be
26734c75e3aaSDag-Erling Smørgrav 		 * classified as CNAME response type, even when the original
26744c75e3aaSDag-Erling Smørgrav 		 * QTYPE=CNAME. This should be treated as answer response type.
26754c75e3aaSDag-Erling Smørgrav 		 */
26764c75e3aaSDag-Erling Smørgrav 		type = RESPONSE_TYPE_ANSWER;
267765b390aaSDag-Erling Smørgrav 	}
2678b7579f77SDag-Erling Smørgrav 
2679b7579f77SDag-Erling Smørgrav 	/* handle each of the type cases */
2680b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_ANSWER) {
2681b7579f77SDag-Erling Smørgrav 		/* ANSWER type responses terminate the query algorithm,
2682b7579f77SDag-Erling Smørgrav 		 * so they sent on their */
2683b7579f77SDag-Erling Smørgrav 		if(verbosity >= VERB_DETAIL) {
2684b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "query response was %s",
2685b7579f77SDag-Erling Smørgrav 				FLAGS_GET_RCODE(iq->response->rep->flags)
2686b7579f77SDag-Erling Smørgrav 				==LDNS_RCODE_NXDOMAIN?"NXDOMAIN ANSWER":
2687b7579f77SDag-Erling Smørgrav 				(iq->response->rep->an_numrrsets?"ANSWER":
2688b7579f77SDag-Erling Smørgrav 				"nodata ANSWER"));
2689b7579f77SDag-Erling Smørgrav 		}
2690b7579f77SDag-Erling Smørgrav 		/* if qtype is DS, check we have the right level of answer,
2691b7579f77SDag-Erling Smørgrav 		 * like grandchild answer but we need the middle, reject it */
2692b7579f77SDag-Erling Smørgrav 		if(iq->qchase.qtype == LDNS_RR_TYPE_DS && !iq->dsns_point
2693b7579f77SDag-Erling Smørgrav 			&& !(iq->chase_flags&BIT_RD)
2694b7579f77SDag-Erling Smørgrav 			&& iter_ds_toolow(iq->response, iq->dp)
26958ed2b524SDag-Erling Smørgrav 			&& iter_dp_cangodown(&iq->qchase, iq->dp)) {
26968ed2b524SDag-Erling Smørgrav 			/* close down outstanding requests to be discarded */
26978ed2b524SDag-Erling Smørgrav 			outbound_list_clear(&iq->outlist);
26988ed2b524SDag-Erling Smørgrav 			iq->num_current_queries = 0;
26998ed2b524SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_detach_subs(
27008ed2b524SDag-Erling Smørgrav 				qstate->env->detach_subs));
27018ed2b524SDag-Erling Smørgrav 			(*qstate->env->detach_subs)(qstate);
27028ed2b524SDag-Erling Smørgrav 			iq->num_target_queries = 0;
2703b7579f77SDag-Erling Smørgrav 			return processDSNSFind(qstate, iq, id);
27048ed2b524SDag-Erling Smørgrav 		}
2705bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store)
27068ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &iq->response->qinfo,
2707b7579f77SDag-Erling Smørgrav 				iq->response->rep, 0, qstate->prefetch_leeway,
2708b7579f77SDag-Erling Smørgrav 				iq->dp&&iq->dp->has_parent_side_NS,
2709ff825849SDag-Erling Smørgrav 				qstate->region, qstate->query_flags);
2710b7579f77SDag-Erling Smørgrav 		/* close down outstanding requests to be discarded */
2711b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
2712b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
2713b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
2714b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
2715b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
2716b7579f77SDag-Erling Smørgrav 		iq->num_target_queries = 0;
2717b7579f77SDag-Erling Smørgrav 		if(qstate->reply)
2718b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin,
2719b7579f77SDag-Erling Smørgrav 				&qstate->reply->addr, qstate->reply->addrlen,
2720b7579f77SDag-Erling Smørgrav 				qstate->region);
2721a755b6f6SDag-Erling Smørgrav 		if(iq->minimisation_state != DONOT_MINIMISE_STATE
2722a755b6f6SDag-Erling Smørgrav 			&& !(iq->chase_flags & BIT_RD)) {
272305ab2901SDag-Erling Smørgrav 			if(FLAGS_GET_RCODE(iq->response->rep->flags) !=
2724bc892140SDag-Erling Smørgrav 				LDNS_RCODE_NOERROR) {
2725e86b9096SDag-Erling Smørgrav 				if(qstate->env->cfg->qname_minimisation_strict) {
2726e86b9096SDag-Erling Smørgrav 					if(FLAGS_GET_RCODE(iq->response->rep->flags) ==
2727e86b9096SDag-Erling Smørgrav 						LDNS_RCODE_NXDOMAIN) {
2728e86b9096SDag-Erling Smørgrav 						iter_scrub_nxdomain(iq->response);
2729bc892140SDag-Erling Smørgrav 						return final_state(iq);
2730e86b9096SDag-Erling Smørgrav 					}
2731e86b9096SDag-Erling Smørgrav 					return error_response(qstate, id,
2732e86b9096SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
2733e86b9096SDag-Erling Smørgrav 				}
2734bc892140SDag-Erling Smørgrav 				/* Best effort qname-minimisation.
2735bc892140SDag-Erling Smørgrav 				 * Stop minimising and send full query when
2736bc892140SDag-Erling Smørgrav 				 * RCODE is not NOERROR. */
273705ab2901SDag-Erling Smørgrav 				iq->minimisation_state = DONOT_MINIMISE_STATE;
2738bc892140SDag-Erling Smørgrav 			}
2739e2d15004SDag-Erling Smørgrav 			if(FLAGS_GET_RCODE(iq->response->rep->flags) ==
2740e2d15004SDag-Erling Smørgrav 				LDNS_RCODE_NXDOMAIN) {
2741e2d15004SDag-Erling Smørgrav 				/* Stop resolving when NXDOMAIN is DNSSEC
27428a384985SDag-Erling Smørgrav 				 * signed. Based on assumption that nameservers
2743e2d15004SDag-Erling Smørgrav 				 * serving signed zones do not return NXDOMAIN
2744e2d15004SDag-Erling Smørgrav 				 * for empty-non-terminals. */
2745e2d15004SDag-Erling Smørgrav 				if(iq->dnssec_expected)
2746e2d15004SDag-Erling Smørgrav 					return final_state(iq);
2747e2d15004SDag-Erling Smørgrav 				/* Make subrequest to validate intermediate
2748e2d15004SDag-Erling Smørgrav 				 * NXDOMAIN if harden-below-nxdomain is
2749e2d15004SDag-Erling Smørgrav 				 * enabled. */
2750e2d15004SDag-Erling Smørgrav 				if(qstate->env->cfg->harden_below_nxdomain) {
2751e2d15004SDag-Erling Smørgrav 					struct module_qstate* subq = NULL;
2752e2d15004SDag-Erling Smørgrav 					log_query_info(VERB_QUERY,
2753e2d15004SDag-Erling Smørgrav 						"schedule NXDOMAIN validation:",
2754e2d15004SDag-Erling Smørgrav 						&iq->response->qinfo);
2755e2d15004SDag-Erling Smørgrav 					if(!generate_sub_request(
2756e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qname,
2757e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qname_len,
2758e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qtype,
2759e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qclass,
2760e2d15004SDag-Erling Smørgrav 						qstate, id, iq,
2761e2d15004SDag-Erling Smørgrav 						INIT_REQUEST_STATE,
2762e2d15004SDag-Erling Smørgrav 						FINISHED_STATE, &subq, 1))
2763e2d15004SDag-Erling Smørgrav 						verbose(VERB_ALGO,
2764e2d15004SDag-Erling Smørgrav 						"could not validate NXDOMAIN "
2765e2d15004SDag-Erling Smørgrav 						"response");
2766a755b6f6SDag-Erling Smørgrav 					outbound_list_clear(&iq->outlist);
2767a755b6f6SDag-Erling Smørgrav 					iq->num_current_queries = 0;
2768a755b6f6SDag-Erling Smørgrav 					fptr_ok(fptr_whitelist_modenv_detach_subs(
2769a755b6f6SDag-Erling Smørgrav 						qstate->env->detach_subs));
2770a755b6f6SDag-Erling Smørgrav 					(*qstate->env->detach_subs)(qstate);
2771a755b6f6SDag-Erling Smørgrav 					iq->num_target_queries = 0;
2772e2d15004SDag-Erling Smørgrav 				}
2773e2d15004SDag-Erling Smørgrav 			}
277405ab2901SDag-Erling Smørgrav 			return next_state(iq, QUERYTARGETS_STATE);
277505ab2901SDag-Erling Smørgrav 		}
2776b7579f77SDag-Erling Smørgrav 		return final_state(iq);
2777b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_REFERRAL) {
2778b7579f77SDag-Erling Smørgrav 		/* REFERRAL type responses get a reset of the
2779b7579f77SDag-Erling Smørgrav 		 * delegation point, and back to the QUERYTARGETS_STATE. */
2780b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was REFERRAL");
2781b7579f77SDag-Erling Smørgrav 
278209a3aaf3SDag-Erling Smørgrav 		if(!(iq->chase_flags & BIT_RD) && !iq->ratelimit_ok) {
278309a3aaf3SDag-Erling Smørgrav 			/* we have a referral, no ratelimit, we can send
278409a3aaf3SDag-Erling Smørgrav 			 * our queries to the given name */
278509a3aaf3SDag-Erling Smørgrav 			infra_ratelimit_dec(qstate->env->infra_cache,
278609a3aaf3SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
278709a3aaf3SDag-Erling Smørgrav 				*qstate->env->now);
278809a3aaf3SDag-Erling Smørgrav 		}
278909a3aaf3SDag-Erling Smørgrav 
2790b7579f77SDag-Erling Smørgrav 		/* if hardened, only store referral if we asked for it */
2791bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store &&
2792bc892140SDag-Erling Smørgrav 		(!qstate->env->cfg->harden_referral_path ||
2793b7579f77SDag-Erling Smørgrav 		    (  qstate->qinfo.qtype == LDNS_RR_TYPE_NS
2794b7579f77SDag-Erling Smørgrav 			&& (qstate->query_flags&BIT_RD)
2795b7579f77SDag-Erling Smørgrav 			&& !(qstate->query_flags&BIT_CD)
2796b7579f77SDag-Erling Smørgrav 			   /* we know that all other NS rrsets are scrubbed
2797b7579f77SDag-Erling Smørgrav 			    * away, thus on referral only one is left.
2798b7579f77SDag-Erling Smørgrav 			    * see if that equals the query name... */
2799b7579f77SDag-Erling Smørgrav 			&& ( /* auth section, but sometimes in answer section*/
2800b7579f77SDag-Erling Smørgrav 			  reply_find_rrset_section_ns(iq->response->rep,
2801b7579f77SDag-Erling Smørgrav 				iq->qchase.qname, iq->qchase.qname_len,
2802b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_NS, iq->qchase.qclass)
2803b7579f77SDag-Erling Smørgrav 			  || reply_find_rrset_section_an(iq->response->rep,
2804b7579f77SDag-Erling Smørgrav 				iq->qchase.qname, iq->qchase.qname_len,
2805b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_NS, iq->qchase.qclass)
2806b7579f77SDag-Erling Smørgrav 			  )
2807bc892140SDag-Erling Smørgrav 		    ))) {
2808b7579f77SDag-Erling Smørgrav 			/* Store the referral under the current query */
2809b7579f77SDag-Erling Smørgrav 			/* no prefetch-leeway, since its not the answer */
28108ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &iq->response->qinfo,
2811ff825849SDag-Erling Smørgrav 				iq->response->rep, 1, 0, 0, NULL, 0);
2812b7579f77SDag-Erling Smørgrav 			if(iq->store_parent_NS)
2813b7579f77SDag-Erling Smørgrav 				iter_store_parentside_NS(qstate->env,
2814b7579f77SDag-Erling Smørgrav 					iq->response->rep);
2815b7579f77SDag-Erling Smørgrav 			if(qstate->env->neg_cache)
2816b7579f77SDag-Erling Smørgrav 				val_neg_addreferral(qstate->env->neg_cache,
2817b7579f77SDag-Erling Smørgrav 					iq->response->rep, iq->dp->name);
2818b7579f77SDag-Erling Smørgrav 		}
2819b7579f77SDag-Erling Smørgrav 		/* store parent-side-in-zone-glue, if directly queried for */
2820bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store && iq->query_for_pside_glue
2821bc892140SDag-Erling Smørgrav 			&& !iq->pside_glue) {
2822b7579f77SDag-Erling Smørgrav 				iq->pside_glue = reply_find_rrset(iq->response->rep,
2823b7579f77SDag-Erling Smørgrav 					iq->qchase.qname, iq->qchase.qname_len,
2824b7579f77SDag-Erling Smørgrav 					iq->qchase.qtype, iq->qchase.qclass);
2825b7579f77SDag-Erling Smørgrav 				if(iq->pside_glue) {
2826b7579f77SDag-Erling Smørgrav 					log_rrset_key(VERB_ALGO, "found parent-side "
2827b7579f77SDag-Erling Smørgrav 						"glue", iq->pside_glue);
2828b7579f77SDag-Erling Smørgrav 					iter_store_parentside_rrset(qstate->env,
2829b7579f77SDag-Erling Smørgrav 						iq->pside_glue);
2830b7579f77SDag-Erling Smørgrav 				}
2831b7579f77SDag-Erling Smørgrav 		}
2832b7579f77SDag-Erling Smørgrav 
2833b7579f77SDag-Erling Smørgrav 		/* Reset the event state, setting the current delegation
2834b7579f77SDag-Erling Smørgrav 		 * point to the referral. */
2835b7579f77SDag-Erling Smørgrav 		iq->deleg_msg = iq->response;
2836b7579f77SDag-Erling Smørgrav 		iq->dp = delegpt_from_message(iq->response, qstate->region);
283705ab2901SDag-Erling Smørgrav 		if (qstate->env->cfg->qname_minimisation)
283805ab2901SDag-Erling Smørgrav 			iq->minimisation_state = INIT_MINIMISE_STATE;
28394c75e3aaSDag-Erling Smørgrav 		if(!iq->dp) {
28404c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, for delegation point");
2841b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
28424c75e3aaSDag-Erling Smørgrav 		}
2843b7579f77SDag-Erling Smørgrav 		if(!cache_fill_missing(qstate->env, iq->qchase.qclass,
28444c75e3aaSDag-Erling Smørgrav 			qstate->region, iq->dp)) {
28454c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, copy extra info into delegation point");
2846b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
28474c75e3aaSDag-Erling Smørgrav 		}
2848b7579f77SDag-Erling Smørgrav 		if(iq->store_parent_NS && query_dname_compare(iq->dp->name,
2849b7579f77SDag-Erling Smørgrav 			iq->store_parent_NS->name) == 0)
2850b7579f77SDag-Erling Smørgrav 			iter_merge_retry_counts(iq->dp, iq->store_parent_NS);
2851b7579f77SDag-Erling Smørgrav 		delegpt_log(VERB_ALGO, iq->dp);
2852b7579f77SDag-Erling Smørgrav 		/* Count this as a referral. */
2853b7579f77SDag-Erling Smørgrav 		iq->referral_count++;
2854b7579f77SDag-Erling Smørgrav 		iq->sent_count = 0;
2855b7579f77SDag-Erling Smørgrav 		/* see if the next dp is a trust anchor, or a DS was sent
2856b7579f77SDag-Erling Smørgrav 		 * along, indicating dnssec is expected for next zone */
2857b7579f77SDag-Erling Smørgrav 		iq->dnssec_expected = iter_indicates_dnssec(qstate->env,
2858b7579f77SDag-Erling Smørgrav 			iq->dp, iq->response, iq->qchase.qclass);
2859b7579f77SDag-Erling Smørgrav 		/* if dnssec, validating then also fetch the key for the DS */
2860b7579f77SDag-Erling Smørgrav 		if(iq->dnssec_expected && qstate->env->cfg->prefetch_key &&
2861b7579f77SDag-Erling Smørgrav 			!(qstate->query_flags&BIT_CD))
2862b7579f77SDag-Erling Smørgrav 			generate_dnskey_prefetch(qstate, iq, id);
2863b7579f77SDag-Erling Smørgrav 
2864b7579f77SDag-Erling Smørgrav 		/* spawn off NS and addr to auth servers for the NS we just
2865b7579f77SDag-Erling Smørgrav 		 * got in the referral. This gets authoritative answer
2866b7579f77SDag-Erling Smørgrav 		 * (answer section trust level) rrset.
2867b7579f77SDag-Erling Smørgrav 		 * right after, we detach the subs, answer goes to cache. */
2868b7579f77SDag-Erling Smørgrav 		if(qstate->env->cfg->harden_referral_path)
2869b7579f77SDag-Erling Smørgrav 			generate_ns_check(qstate, iq, id);
2870b7579f77SDag-Erling Smørgrav 
2871b7579f77SDag-Erling Smørgrav 		/* stop current outstanding queries.
2872b7579f77SDag-Erling Smørgrav 		 * FIXME: should the outstanding queries be waited for and
2873b7579f77SDag-Erling Smørgrav 		 * handled? Say by a subquery that inherits the outbound_entry.
2874b7579f77SDag-Erling Smørgrav 		 */
2875b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
2876b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
2877b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
2878b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
2879b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
2880b7579f77SDag-Erling Smørgrav 		iq->num_target_queries = 0;
2881b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "cleared outbound list for next round");
2882b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2883b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_CNAME) {
2884b7579f77SDag-Erling Smørgrav 		uint8_t* sname = NULL;
2885b7579f77SDag-Erling Smørgrav 		size_t snamelen = 0;
2886b7579f77SDag-Erling Smørgrav 		/* CNAME type responses get a query restart (i.e., get a
2887b7579f77SDag-Erling Smørgrav 		 * reset of the query state and go back to INIT_REQUEST_STATE).
2888b7579f77SDag-Erling Smørgrav 		 */
2889b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was CNAME");
2890b7579f77SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO)
2891b7579f77SDag-Erling Smørgrav 			log_dns_msg("cname msg", &iq->response->qinfo,
2892b7579f77SDag-Erling Smørgrav 				iq->response->rep);
2893b7579f77SDag-Erling Smørgrav 		/* if qtype is DS, check we have the right level of answer,
2894b7579f77SDag-Erling Smørgrav 		 * like grandchild answer but we need the middle, reject it */
2895b7579f77SDag-Erling Smørgrav 		if(iq->qchase.qtype == LDNS_RR_TYPE_DS && !iq->dsns_point
2896b7579f77SDag-Erling Smørgrav 			&& !(iq->chase_flags&BIT_RD)
2897b7579f77SDag-Erling Smørgrav 			&& iter_ds_toolow(iq->response, iq->dp)
28988ed2b524SDag-Erling Smørgrav 			&& iter_dp_cangodown(&iq->qchase, iq->dp)) {
28998ed2b524SDag-Erling Smørgrav 			outbound_list_clear(&iq->outlist);
29008ed2b524SDag-Erling Smørgrav 			iq->num_current_queries = 0;
29018ed2b524SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_detach_subs(
29028ed2b524SDag-Erling Smørgrav 				qstate->env->detach_subs));
29038ed2b524SDag-Erling Smørgrav 			(*qstate->env->detach_subs)(qstate);
29048ed2b524SDag-Erling Smørgrav 			iq->num_target_queries = 0;
2905b7579f77SDag-Erling Smørgrav 			return processDSNSFind(qstate, iq, id);
29068ed2b524SDag-Erling Smørgrav 		}
2907b7579f77SDag-Erling Smørgrav 		/* Process the CNAME response. */
2908b7579f77SDag-Erling Smørgrav 		if(!handle_cname_response(qstate, iq, iq->response,
29094c75e3aaSDag-Erling Smørgrav 			&sname, &snamelen)) {
29104c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, CNAME info");
2911b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
29124c75e3aaSDag-Erling Smørgrav 		}
2913b7579f77SDag-Erling Smørgrav 		/* cache the CNAME response under the current query */
2914b7579f77SDag-Erling Smørgrav 		/* NOTE : set referral=1, so that rrsets get stored but not
2915b7579f77SDag-Erling Smørgrav 		 * the partial query answer (CNAME only). */
2916b7579f77SDag-Erling Smørgrav 		/* prefetchleeway applied because this updates answer parts */
2917bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store)
29188ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &iq->response->qinfo,
2919b7579f77SDag-Erling Smørgrav 				iq->response->rep, 1, qstate->prefetch_leeway,
2920ff825849SDag-Erling Smørgrav 				iq->dp&&iq->dp->has_parent_side_NS, NULL,
2921ff825849SDag-Erling Smørgrav 				qstate->query_flags);
2922b7579f77SDag-Erling Smørgrav 		/* set the current request's qname to the new value. */
2923b7579f77SDag-Erling Smørgrav 		iq->qchase.qname = sname;
2924b7579f77SDag-Erling Smørgrav 		iq->qchase.qname_len = snamelen;
2925b7579f77SDag-Erling Smørgrav 		/* Clear the query state, since this is a query restart. */
2926b7579f77SDag-Erling Smørgrav 		iq->deleg_msg = NULL;
2927b7579f77SDag-Erling Smørgrav 		iq->dp = NULL;
2928b7579f77SDag-Erling Smørgrav 		iq->dsns_point = NULL;
292957bddd21SDag-Erling Smørgrav 		iq->auth_zone_response = 0;
2930b7579f77SDag-Erling Smørgrav 		iq->sent_count = 0;
29317da0adf7SDag-Erling Smørgrav 		if(iq->minimisation_state != MINIMISE_STATE)
29327da0adf7SDag-Erling Smørgrav 			/* Only count as query restart when it is not an extra
29337da0adf7SDag-Erling Smørgrav 			 * query as result of qname minimisation. */
29347da0adf7SDag-Erling Smørgrav 			iq->query_restart_count++;
29357da0adf7SDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation)
29367da0adf7SDag-Erling Smørgrav 			iq->minimisation_state = INIT_MINIMISE_STATE;
2937b7579f77SDag-Erling Smørgrav 
2938b7579f77SDag-Erling Smørgrav 		/* stop current outstanding queries.
2939b7579f77SDag-Erling Smørgrav 		 * FIXME: should the outstanding queries be waited for and
2940b7579f77SDag-Erling Smørgrav 		 * handled? Say by a subquery that inherits the outbound_entry.
2941b7579f77SDag-Erling Smørgrav 		 */
2942b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
2943b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
2944b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
2945b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
2946b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
2947b7579f77SDag-Erling Smørgrav 		iq->num_target_queries = 0;
2948b7579f77SDag-Erling Smørgrav 		if(qstate->reply)
2949b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin,
2950b7579f77SDag-Erling Smørgrav 				&qstate->reply->addr, qstate->reply->addrlen,
2951b7579f77SDag-Erling Smørgrav 				qstate->region);
2952b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "cleared outbound list for query restart");
2953b7579f77SDag-Erling Smørgrav 		/* go to INIT_REQUEST_STATE for new qname. */
2954b7579f77SDag-Erling Smørgrav 		return next_state(iq, INIT_REQUEST_STATE);
2955b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_LAME) {
2956b7579f77SDag-Erling Smørgrav 		/* Cache the LAMEness. */
2957b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was %sLAME",
2958b7579f77SDag-Erling Smørgrav 			dnsseclame?"DNSSEC ":"");
2959b7579f77SDag-Erling Smørgrav 		if(!dname_subdomain_c(iq->qchase.qname, iq->dp->name)) {
2960b7579f77SDag-Erling Smørgrav 			log_err("mark lame: mismatch in qname and dpname");
2961b7579f77SDag-Erling Smørgrav 			/* throwaway this reply below */
2962b7579f77SDag-Erling Smørgrav 		} else if(qstate->reply) {
2963b7579f77SDag-Erling Smørgrav 			/* need addr for lameness cache, but we may have
2964b7579f77SDag-Erling Smørgrav 			 * gotten this from cache, so test to be sure */
2965b7579f77SDag-Erling Smørgrav 			if(!infra_set_lame(qstate->env->infra_cache,
2966b7579f77SDag-Erling Smørgrav 				&qstate->reply->addr, qstate->reply->addrlen,
2967b7579f77SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
2968b7579f77SDag-Erling Smørgrav 				*qstate->env->now, dnsseclame, 0,
2969b7579f77SDag-Erling Smørgrav 				iq->qchase.qtype))
2970b7579f77SDag-Erling Smørgrav 				log_err("mark host lame: out of memory");
297117d15b25SDag-Erling Smørgrav 		}
2972b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_REC_LAME) {
2973b7579f77SDag-Erling Smørgrav 		/* Cache the LAMEness. */
2974b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response REC_LAME: "
2975b7579f77SDag-Erling Smørgrav 			"recursive but not authoritative server");
2976b7579f77SDag-Erling Smørgrav 		if(!dname_subdomain_c(iq->qchase.qname, iq->dp->name)) {
2977b7579f77SDag-Erling Smørgrav 			log_err("mark rec_lame: mismatch in qname and dpname");
2978b7579f77SDag-Erling Smørgrav 			/* throwaway this reply below */
2979b7579f77SDag-Erling Smørgrav 		} else if(qstate->reply) {
2980b7579f77SDag-Erling Smørgrav 			/* need addr for lameness cache, but we may have
2981b7579f77SDag-Erling Smørgrav 			 * gotten this from cache, so test to be sure */
2982b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "mark as REC_LAME");
2983b7579f77SDag-Erling Smørgrav 			if(!infra_set_lame(qstate->env->infra_cache,
2984b7579f77SDag-Erling Smørgrav 				&qstate->reply->addr, qstate->reply->addrlen,
2985b7579f77SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
2986b7579f77SDag-Erling Smørgrav 				*qstate->env->now, 0, 1, iq->qchase.qtype))
2987b7579f77SDag-Erling Smørgrav 				log_err("mark host lame: out of memory");
2988b7579f77SDag-Erling Smørgrav 		}
2989b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_THROWAWAY) {
2990b7579f77SDag-Erling Smørgrav 		/* LAME and THROWAWAY responses are handled the same way.
2991b7579f77SDag-Erling Smørgrav 		 * In this case, the event is just sent directly back to
2992b7579f77SDag-Erling Smørgrav 		 * the QUERYTARGETS_STATE without resetting anything,
2993b7579f77SDag-Erling Smørgrav 		 * because, clearly, the next target must be tried. */
2994b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was THROWAWAY");
2995b7579f77SDag-Erling Smørgrav 	} else {
2996b7579f77SDag-Erling Smørgrav 		log_warn("A query response came back with an unknown type: %d",
2997b7579f77SDag-Erling Smørgrav 			(int)type);
2998b7579f77SDag-Erling Smørgrav 	}
2999b7579f77SDag-Erling Smørgrav 
3000b7579f77SDag-Erling Smørgrav 	/* LAME, THROWAWAY and "unknown" all end up here.
3001b7579f77SDag-Erling Smørgrav 	 * Recycle to the QUERYTARGETS state to hopefully try a
3002b7579f77SDag-Erling Smørgrav 	 * different target. */
3003bc892140SDag-Erling Smørgrav 	if (qstate->env->cfg->qname_minimisation &&
3004bc892140SDag-Erling Smørgrav 		!qstate->env->cfg->qname_minimisation_strict)
300505ab2901SDag-Erling Smørgrav 		iq->minimisation_state = DONOT_MINIMISE_STATE;
300657bddd21SDag-Erling Smørgrav 	if(iq->auth_zone_response) {
300757bddd21SDag-Erling Smørgrav 		/* can we fallback? */
300857bddd21SDag-Erling Smørgrav 		iq->auth_zone_response = 0;
300957bddd21SDag-Erling Smørgrav 		if(!auth_zones_can_fallback(qstate->env->auth_zones,
301057bddd21SDag-Erling Smørgrav 			iq->dp->name, iq->dp->namelen, qstate->qinfo.qclass)) {
301157bddd21SDag-Erling Smørgrav 			verbose(VERB_ALGO, "auth zone response bad, and no"
301257bddd21SDag-Erling Smørgrav 				" fallback possible, servfail");
3013a755b6f6SDag-Erling Smørgrav 			errinf_dname(qstate, "response is bad, no fallback, "
30144c75e3aaSDag-Erling Smørgrav 				"for auth zone", iq->dp->name);
301557bddd21SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
301657bddd21SDag-Erling Smørgrav 		}
301757bddd21SDag-Erling Smørgrav 		verbose(VERB_ALGO, "auth zone response was bad, "
301857bddd21SDag-Erling Smørgrav 			"fallback enabled");
301957bddd21SDag-Erling Smørgrav 		iq->auth_zone_avoid = 1;
302057bddd21SDag-Erling Smørgrav 		if(iq->dp->auth_dp) {
302157bddd21SDag-Erling Smørgrav 			/* we are using a dp for the auth zone, with no
302257bddd21SDag-Erling Smørgrav 			 * nameservers, get one first */
302357bddd21SDag-Erling Smørgrav 			iq->dp = NULL;
302457bddd21SDag-Erling Smørgrav 			return next_state(iq, INIT_REQUEST_STATE);
302557bddd21SDag-Erling Smørgrav 		}
302657bddd21SDag-Erling Smørgrav 	}
3027b7579f77SDag-Erling Smørgrav 	return next_state(iq, QUERYTARGETS_STATE);
3028b7579f77SDag-Erling Smørgrav }
3029b7579f77SDag-Erling Smørgrav 
3030b7579f77SDag-Erling Smørgrav /**
3031ff825849SDag-Erling Smørgrav  * Return priming query results to interested super querystates.
3032b7579f77SDag-Erling Smørgrav  *
3033b7579f77SDag-Erling Smørgrav  * Sets the delegation point and delegation message (not nonRD queries).
3034b7579f77SDag-Erling Smørgrav  * This is a callback from walk_supers.
3035b7579f77SDag-Erling Smørgrav  *
3036b7579f77SDag-Erling Smørgrav  * @param qstate: priming query state that finished.
3037b7579f77SDag-Erling Smørgrav  * @param id: module id.
3038b7579f77SDag-Erling Smørgrav  * @param forq: the qstate for which priming has been done.
3039b7579f77SDag-Erling Smørgrav  */
3040b7579f77SDag-Erling Smørgrav static void
3041b7579f77SDag-Erling Smørgrav prime_supers(struct module_qstate* qstate, int id, struct module_qstate* forq)
3042b7579f77SDag-Erling Smørgrav {
3043b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
3044b7579f77SDag-Erling Smørgrav 	struct delegpt* dp = NULL;
3045b7579f77SDag-Erling Smørgrav 
3046b7579f77SDag-Erling Smørgrav 	log_assert(qstate->is_priming || foriq->wait_priming_stub);
3047b7579f77SDag-Erling Smørgrav 	log_assert(qstate->return_rcode == LDNS_RCODE_NOERROR);
3048b7579f77SDag-Erling Smørgrav 	/* Convert our response to a delegation point */
3049b7579f77SDag-Erling Smørgrav 	dp = delegpt_from_message(qstate->return_msg, forq->region);
3050b7579f77SDag-Erling Smørgrav 	if(!dp) {
3051b7579f77SDag-Erling Smørgrav 		/* if there is no convertable delegation point, then
3052b7579f77SDag-Erling Smørgrav 		 * the ANSWER type was (presumably) a negative answer. */
3053b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "prime response was not a positive "
3054b7579f77SDag-Erling Smørgrav 			"ANSWER; failing");
3055b7579f77SDag-Erling Smørgrav 		foriq->dp = NULL;
3056b7579f77SDag-Erling Smørgrav 		foriq->state = QUERYTARGETS_STATE;
3057b7579f77SDag-Erling Smørgrav 		return;
3058b7579f77SDag-Erling Smørgrav 	}
3059b7579f77SDag-Erling Smørgrav 
3060b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_DETAIL, "priming successful for", &qstate->qinfo);
3061b7579f77SDag-Erling Smørgrav 	delegpt_log(VERB_ALGO, dp);
3062b7579f77SDag-Erling Smørgrav 	foriq->dp = dp;
3063b7579f77SDag-Erling Smørgrav 	foriq->deleg_msg = dns_copy_msg(qstate->return_msg, forq->region);
3064b7579f77SDag-Erling Smørgrav 	if(!foriq->deleg_msg) {
3065b7579f77SDag-Erling Smørgrav 		log_err("copy prime response: out of memory");
3066b7579f77SDag-Erling Smørgrav 		foriq->dp = NULL;
3067b7579f77SDag-Erling Smørgrav 		foriq->state = QUERYTARGETS_STATE;
3068b7579f77SDag-Erling Smørgrav 		return;
3069b7579f77SDag-Erling Smørgrav 	}
3070b7579f77SDag-Erling Smørgrav 
3071b7579f77SDag-Erling Smørgrav 	/* root priming responses go to init stage 2, priming stub
3072b7579f77SDag-Erling Smørgrav 	 * responses to to stage 3. */
3073b7579f77SDag-Erling Smørgrav 	if(foriq->wait_priming_stub) {
3074b7579f77SDag-Erling Smørgrav 		foriq->state = INIT_REQUEST_3_STATE;
3075b7579f77SDag-Erling Smørgrav 		foriq->wait_priming_stub = 0;
3076b7579f77SDag-Erling Smørgrav 	} else	foriq->state = INIT_REQUEST_2_STATE;
3077b7579f77SDag-Erling Smørgrav 	/* because we are finished, the parent will be reactivated */
3078b7579f77SDag-Erling Smørgrav }
3079b7579f77SDag-Erling Smørgrav 
3080b7579f77SDag-Erling Smørgrav /**
3081b7579f77SDag-Erling Smørgrav  * This handles the response to a priming query. This is used to handle both
3082b7579f77SDag-Erling Smørgrav  * root and stub priming responses. This is basically the equivalent of the
3083b7579f77SDag-Erling Smørgrav  * QUERY_RESP_STATE, but will not handle CNAME responses and will treat
3084b7579f77SDag-Erling Smørgrav  * REFERRALs as ANSWERS. It will also update and reactivate the originating
3085b7579f77SDag-Erling Smørgrav  * event.
3086b7579f77SDag-Erling Smørgrav  *
3087b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3088b7579f77SDag-Erling Smørgrav  * @param id: module id.
3089b7579f77SDag-Erling Smørgrav  * @return true if the event needs more immediate processing, false if not.
3090b7579f77SDag-Erling Smørgrav  *         This state always returns false.
3091b7579f77SDag-Erling Smørgrav  */
3092b7579f77SDag-Erling Smørgrav static int
3093b7579f77SDag-Erling Smørgrav processPrimeResponse(struct module_qstate* qstate, int id)
3094b7579f77SDag-Erling Smørgrav {
3095b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
3096b7579f77SDag-Erling Smørgrav 	enum response_type type;
3097b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags &= ~(BIT_RD|BIT_RA); /* ignore rec-lame */
3098b7579f77SDag-Erling Smørgrav 	type = response_type_from_server(
3099b7579f77SDag-Erling Smørgrav 		(int)((iq->chase_flags&BIT_RD) || iq->chase_to_rd),
3100b7579f77SDag-Erling Smørgrav 		iq->response, &iq->qchase, iq->dp);
3101b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_ANSWER) {
3102b7579f77SDag-Erling Smørgrav 		qstate->return_rcode = LDNS_RCODE_NOERROR;
3103b7579f77SDag-Erling Smørgrav 		qstate->return_msg = iq->response;
3104b7579f77SDag-Erling Smørgrav 	} else {
31054c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "prime response did not get an answer");
31064c75e3aaSDag-Erling Smørgrav 		errinf_dname(qstate, "for", qstate->qinfo.qname);
3107b7579f77SDag-Erling Smørgrav 		qstate->return_rcode = LDNS_RCODE_SERVFAIL;
3108b7579f77SDag-Erling Smørgrav 		qstate->return_msg = NULL;
3109b7579f77SDag-Erling Smørgrav 	}
3110b7579f77SDag-Erling Smørgrav 
3111b7579f77SDag-Erling Smørgrav 	/* validate the root or stub after priming (if enabled).
3112b7579f77SDag-Erling Smørgrav 	 * This is the same query as the prime query, but with validation.
3113b7579f77SDag-Erling Smørgrav 	 * Now that we are primed, the additional queries that validation
3114b7579f77SDag-Erling Smørgrav 	 * may need can be resolved, such as DLV. */
3115b7579f77SDag-Erling Smørgrav 	if(qstate->env->cfg->harden_referral_path) {
3116b7579f77SDag-Erling Smørgrav 		struct module_qstate* subq = NULL;
3117b7579f77SDag-Erling Smørgrav 		log_nametypeclass(VERB_ALGO, "schedule prime validation",
3118b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qname, qstate->qinfo.qtype,
3119b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qclass);
3120b7579f77SDag-Erling Smørgrav 		if(!generate_sub_request(qstate->qinfo.qname,
3121b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qname_len, qstate->qinfo.qtype,
3122b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qclass, qstate, id, iq,
3123b7579f77SDag-Erling Smørgrav 			INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1)) {
3124b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "could not generate prime check");
3125b7579f77SDag-Erling Smørgrav 		}
3126b7579f77SDag-Erling Smørgrav 		generate_a_aaaa_check(qstate, iq, id);
3127b7579f77SDag-Erling Smørgrav 	}
3128b7579f77SDag-Erling Smørgrav 
3129b7579f77SDag-Erling Smørgrav 	/* This event is finished. */
3130b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_finished;
3131b7579f77SDag-Erling Smørgrav 	return 0;
3132b7579f77SDag-Erling Smørgrav }
3133b7579f77SDag-Erling Smørgrav 
3134b7579f77SDag-Erling Smørgrav /**
3135b7579f77SDag-Erling Smørgrav  * Do final processing on responses to target queries. Events reach this
3136b7579f77SDag-Erling Smørgrav  * state after the iterative resolution algorithm terminates. This state is
31378a384985SDag-Erling Smørgrav  * responsible for reactivating the original event, and housekeeping related
3138b7579f77SDag-Erling Smørgrav  * to received target responses (caching, updating the current delegation
3139b7579f77SDag-Erling Smørgrav  * point, etc).
3140b7579f77SDag-Erling Smørgrav  * Callback from walk_supers for every super state that is interested in
3141b7579f77SDag-Erling Smørgrav  * the results from this query.
3142b7579f77SDag-Erling Smørgrav  *
3143b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3144b7579f77SDag-Erling Smørgrav  * @param id: module id.
3145b7579f77SDag-Erling Smørgrav  * @param forq: super query state.
3146b7579f77SDag-Erling Smørgrav  */
3147b7579f77SDag-Erling Smørgrav static void
3148b7579f77SDag-Erling Smørgrav processTargetResponse(struct module_qstate* qstate, int id,
3149b7579f77SDag-Erling Smørgrav 	struct module_qstate* forq)
3150b7579f77SDag-Erling Smørgrav {
3151b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
3152b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
3153b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset;
3154b7579f77SDag-Erling Smørgrav 	struct delegpt_ns* dpns;
3155b7579f77SDag-Erling Smørgrav 	log_assert(qstate->return_rcode == LDNS_RCODE_NOERROR);
3156b7579f77SDag-Erling Smørgrav 
3157b7579f77SDag-Erling Smørgrav 	foriq->state = QUERYTARGETS_STATE;
3158b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processTargetResponse", &qstate->qinfo);
3159b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processTargetResponse super", &forq->qinfo);
3160b7579f77SDag-Erling Smørgrav 
3161b5663de9SDag-Erling Smørgrav 	/* Tell the originating event that this target query has finished
3162b5663de9SDag-Erling Smørgrav 	 * (regardless if it succeeded or not). */
3163b5663de9SDag-Erling Smørgrav 	foriq->num_target_queries--;
3164b5663de9SDag-Erling Smørgrav 
3165b7579f77SDag-Erling Smørgrav 	/* check to see if parent event is still interested (in orig name).  */
3166b7579f77SDag-Erling Smørgrav 	if(!foriq->dp) {
3167b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "subq: parent not interested, was reset");
3168b7579f77SDag-Erling Smørgrav 		return; /* not interested anymore */
3169b7579f77SDag-Erling Smørgrav 	}
3170b7579f77SDag-Erling Smørgrav 	dpns = delegpt_find_ns(foriq->dp, qstate->qinfo.qname,
3171b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qname_len);
3172b7579f77SDag-Erling Smørgrav 	if(!dpns) {
3173b7579f77SDag-Erling Smørgrav 		/* If not interested, just stop processing this event */
3174b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "subq: parent not interested anymore");
3175b7579f77SDag-Erling Smørgrav 		/* could be because parent was jostled out of the cache,
3176b7579f77SDag-Erling Smørgrav 		   and a new identical query arrived, that does not want it*/
3177b7579f77SDag-Erling Smørgrav 		return;
3178b7579f77SDag-Erling Smørgrav 	}
3179b7579f77SDag-Erling Smørgrav 
3180b7579f77SDag-Erling Smørgrav 	/* if iq->query_for_pside_glue then add the pside_glue (marked lame) */
3181b7579f77SDag-Erling Smørgrav 	if(iq->pside_glue) {
3182b7579f77SDag-Erling Smørgrav 		/* if the pside_glue is NULL, then it could not be found,
3183b7579f77SDag-Erling Smørgrav 		 * the done_pside is already set when created and a cache
3184b7579f77SDag-Erling Smørgrav 		 * entry created in processFinished so nothing to do here */
3185b7579f77SDag-Erling Smørgrav 		log_rrset_key(VERB_ALGO, "add parentside glue to dp",
3186b7579f77SDag-Erling Smørgrav 			iq->pside_glue);
3187b7579f77SDag-Erling Smørgrav 		if(!delegpt_add_rrset(foriq->dp, forq->region,
3188b7579f77SDag-Erling Smørgrav 			iq->pside_glue, 1))
3189b7579f77SDag-Erling Smørgrav 			log_err("out of memory adding pside glue");
3190b7579f77SDag-Erling Smørgrav 	}
3191b7579f77SDag-Erling Smørgrav 
3192b7579f77SDag-Erling Smørgrav 	/* This response is relevant to the current query, so we
3193b7579f77SDag-Erling Smørgrav 	 * add (attempt to add, anyway) this target(s) and reactivate
3194b7579f77SDag-Erling Smørgrav 	 * the original event.
3195b7579f77SDag-Erling Smørgrav 	 * NOTE: we could only look for the AnswerRRset if the
3196b7579f77SDag-Erling Smørgrav 	 * response type was ANSWER. */
3197b7579f77SDag-Erling Smørgrav 	rrset = reply_find_answer_rrset(&iq->qchase, qstate->return_msg->rep);
3198b7579f77SDag-Erling Smørgrav 	if(rrset) {
3199b7579f77SDag-Erling Smørgrav 		/* if CNAMEs have been followed - add new NS to delegpt. */
3200b7579f77SDag-Erling Smørgrav 		/* BTW. RFC 1918 says NS should not have got CNAMEs. Robust. */
3201b7579f77SDag-Erling Smørgrav 		if(!delegpt_find_ns(foriq->dp, rrset->rk.dname,
3202b7579f77SDag-Erling Smørgrav 			rrset->rk.dname_len)) {
3203b7579f77SDag-Erling Smørgrav 			/* if dpns->lame then set newcname ns lame too */
3204b7579f77SDag-Erling Smørgrav 			if(!delegpt_add_ns(foriq->dp, forq->region,
320517d15b25SDag-Erling Smørgrav 				rrset->rk.dname, dpns->lame))
3206b7579f77SDag-Erling Smørgrav 				log_err("out of memory adding cnamed-ns");
3207b7579f77SDag-Erling Smørgrav 		}
3208b7579f77SDag-Erling Smørgrav 		/* if dpns->lame then set the address(es) lame too */
3209b7579f77SDag-Erling Smørgrav 		if(!delegpt_add_rrset(foriq->dp, forq->region, rrset,
321017d15b25SDag-Erling Smørgrav 			dpns->lame))
3211b7579f77SDag-Erling Smørgrav 			log_err("out of memory adding targets");
3212b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "added target response");
3213b7579f77SDag-Erling Smørgrav 		delegpt_log(VERB_ALGO, foriq->dp);
3214b7579f77SDag-Erling Smørgrav 	} else {
3215b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "iterator TargetResponse failed");
3216b7579f77SDag-Erling Smørgrav 		dpns->resolved = 1; /* fail the target */
3217b7579f77SDag-Erling Smørgrav 	}
3218b7579f77SDag-Erling Smørgrav }
3219b7579f77SDag-Erling Smørgrav 
3220b7579f77SDag-Erling Smørgrav /**
3221b7579f77SDag-Erling Smørgrav  * Process response for DS NS Find queries, that attempt to find the delegation
3222b7579f77SDag-Erling Smørgrav  * point where we ask the DS query from.
3223b7579f77SDag-Erling Smørgrav  *
3224b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3225b7579f77SDag-Erling Smørgrav  * @param id: module id.
3226b7579f77SDag-Erling Smørgrav  * @param forq: super query state.
3227b7579f77SDag-Erling Smørgrav  */
3228b7579f77SDag-Erling Smørgrav static void
3229b7579f77SDag-Erling Smørgrav processDSNSResponse(struct module_qstate* qstate, int id,
3230b7579f77SDag-Erling Smørgrav 	struct module_qstate* forq)
3231b7579f77SDag-Erling Smørgrav {
3232b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
3233b7579f77SDag-Erling Smørgrav 
3234b7579f77SDag-Erling Smørgrav 	/* if the finished (iq->response) query has no NS set: continue
3235b7579f77SDag-Erling Smørgrav 	 * up to look for the right dp; nothing to change, do DPNSstate */
3236b7579f77SDag-Erling Smørgrav 	if(qstate->return_rcode != LDNS_RCODE_NOERROR)
3237b7579f77SDag-Erling Smørgrav 		return; /* seek further */
3238b7579f77SDag-Erling Smørgrav 	/* find the NS RRset (without allowing CNAMEs) */
3239b7579f77SDag-Erling Smørgrav 	if(!reply_find_rrset(qstate->return_msg->rep, qstate->qinfo.qname,
3240b7579f77SDag-Erling Smørgrav 		qstate->qinfo.qname_len, LDNS_RR_TYPE_NS,
3241b7579f77SDag-Erling Smørgrav 		qstate->qinfo.qclass)){
3242b7579f77SDag-Erling Smørgrav 		return; /* seek further */
3243b7579f77SDag-Erling Smørgrav 	}
3244b7579f77SDag-Erling Smørgrav 
3245b7579f77SDag-Erling Smørgrav 	/* else, store as DP and continue at querytargets */
3246b7579f77SDag-Erling Smørgrav 	foriq->state = QUERYTARGETS_STATE;
3247b7579f77SDag-Erling Smørgrav 	foriq->dp = delegpt_from_message(qstate->return_msg, forq->region);
3248b7579f77SDag-Erling Smørgrav 	if(!foriq->dp) {
3249b7579f77SDag-Erling Smørgrav 		log_err("out of memory in dsns dp alloc");
32504c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "malloc failure, in DS search");
3251b7579f77SDag-Erling Smørgrav 		return; /* dp==NULL in QUERYTARGETS makes SERVFAIL */
3252b7579f77SDag-Erling Smørgrav 	}
3253b7579f77SDag-Erling Smørgrav 	/* success, go query the querytargets in the new dp (and go down) */
3254b7579f77SDag-Erling Smørgrav }
3255b7579f77SDag-Erling Smørgrav 
3256b7579f77SDag-Erling Smørgrav /**
3257b7579f77SDag-Erling Smørgrav  * Process response for qclass=ANY queries for a particular class.
3258b7579f77SDag-Erling Smørgrav  * Append to result or error-exit.
3259b7579f77SDag-Erling Smørgrav  *
3260b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3261b7579f77SDag-Erling Smørgrav  * @param id: module id.
3262b7579f77SDag-Erling Smørgrav  * @param forq: super query state.
3263b7579f77SDag-Erling Smørgrav  */
3264b7579f77SDag-Erling Smørgrav static void
3265b7579f77SDag-Erling Smørgrav processClassResponse(struct module_qstate* qstate, int id,
3266b7579f77SDag-Erling Smørgrav 	struct module_qstate* forq)
3267b7579f77SDag-Erling Smørgrav {
3268b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
3269b7579f77SDag-Erling Smørgrav 	struct dns_msg* from = qstate->return_msg;
3270b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processClassResponse", &qstate->qinfo);
3271b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processClassResponse super", &forq->qinfo);
3272b7579f77SDag-Erling Smørgrav 	if(qstate->return_rcode != LDNS_RCODE_NOERROR) {
3273b7579f77SDag-Erling Smørgrav 		/* cause servfail for qclass ANY query */
3274b7579f77SDag-Erling Smørgrav 		foriq->response = NULL;
3275b7579f77SDag-Erling Smørgrav 		foriq->state = FINISHED_STATE;
3276b7579f77SDag-Erling Smørgrav 		return;
3277b7579f77SDag-Erling Smørgrav 	}
3278b7579f77SDag-Erling Smørgrav 	/* append result */
3279b7579f77SDag-Erling Smørgrav 	if(!foriq->response) {
3280b7579f77SDag-Erling Smørgrav 		/* allocate the response: copy RCODE, sec_state */
3281b7579f77SDag-Erling Smørgrav 		foriq->response = dns_copy_msg(from, forq->region);
3282b7579f77SDag-Erling Smørgrav 		if(!foriq->response) {
3283b7579f77SDag-Erling Smørgrav 			log_err("malloc failed for qclass ANY response");
3284b7579f77SDag-Erling Smørgrav 			foriq->state = FINISHED_STATE;
3285b7579f77SDag-Erling Smørgrav 			return;
3286b7579f77SDag-Erling Smørgrav 		}
3287b7579f77SDag-Erling Smørgrav 		foriq->response->qinfo.qclass = forq->qinfo.qclass;
3288b7579f77SDag-Erling Smørgrav 		/* qclass ANY does not receive the AA flag on replies */
3289b7579f77SDag-Erling Smørgrav 		foriq->response->rep->authoritative = 0;
3290b7579f77SDag-Erling Smørgrav 	} else {
3291b7579f77SDag-Erling Smørgrav 		struct dns_msg* to = foriq->response;
3292b7579f77SDag-Erling Smørgrav 		/* add _from_ this response _to_ existing collection */
3293b7579f77SDag-Erling Smørgrav 		/* if there are records, copy RCODE */
3294b7579f77SDag-Erling Smørgrav 		/* lower sec_state if this message is lower */
3295b7579f77SDag-Erling Smørgrav 		if(from->rep->rrset_count != 0) {
3296b7579f77SDag-Erling Smørgrav 			size_t n = from->rep->rrset_count+to->rep->rrset_count;
3297b7579f77SDag-Erling Smørgrav 			struct ub_packed_rrset_key** dest, **d;
3298b7579f77SDag-Erling Smørgrav 			/* copy appropriate rcode */
3299b7579f77SDag-Erling Smørgrav 			to->rep->flags = from->rep->flags;
3300b7579f77SDag-Erling Smørgrav 			/* copy rrsets */
330109a3aaf3SDag-Erling Smørgrav 			if(from->rep->rrset_count > RR_COUNT_MAX ||
330209a3aaf3SDag-Erling Smørgrav 				to->rep->rrset_count > RR_COUNT_MAX) {
330309a3aaf3SDag-Erling Smørgrav 				log_err("malloc failed (too many rrsets) in collect ANY");
330409a3aaf3SDag-Erling Smørgrav 				foriq->state = FINISHED_STATE;
330509a3aaf3SDag-Erling Smørgrav 				return; /* integer overflow protection */
330609a3aaf3SDag-Erling Smørgrav 			}
3307b7579f77SDag-Erling Smørgrav 			dest = regional_alloc(forq->region, sizeof(dest[0])*n);
3308b7579f77SDag-Erling Smørgrav 			if(!dest) {
3309b7579f77SDag-Erling Smørgrav 				log_err("malloc failed in collect ANY");
3310b7579f77SDag-Erling Smørgrav 				foriq->state = FINISHED_STATE;
3311b7579f77SDag-Erling Smørgrav 				return;
3312b7579f77SDag-Erling Smørgrav 			}
3313b7579f77SDag-Erling Smørgrav 			d = dest;
3314b7579f77SDag-Erling Smørgrav 			/* copy AN */
3315b7579f77SDag-Erling Smørgrav 			memcpy(dest, to->rep->rrsets, to->rep->an_numrrsets
3316b7579f77SDag-Erling Smørgrav 				* sizeof(dest[0]));
3317b7579f77SDag-Erling Smørgrav 			dest += to->rep->an_numrrsets;
3318b7579f77SDag-Erling Smørgrav 			memcpy(dest, from->rep->rrsets, from->rep->an_numrrsets
3319b7579f77SDag-Erling Smørgrav 				* sizeof(dest[0]));
3320b7579f77SDag-Erling Smørgrav 			dest += from->rep->an_numrrsets;
3321b7579f77SDag-Erling Smørgrav 			/* copy NS */
3322b7579f77SDag-Erling Smørgrav 			memcpy(dest, to->rep->rrsets+to->rep->an_numrrsets,
3323b7579f77SDag-Erling Smørgrav 				to->rep->ns_numrrsets * sizeof(dest[0]));
3324b7579f77SDag-Erling Smørgrav 			dest += to->rep->ns_numrrsets;
3325b7579f77SDag-Erling Smørgrav 			memcpy(dest, from->rep->rrsets+from->rep->an_numrrsets,
3326b7579f77SDag-Erling Smørgrav 				from->rep->ns_numrrsets * sizeof(dest[0]));
3327b7579f77SDag-Erling Smørgrav 			dest += from->rep->ns_numrrsets;
3328b7579f77SDag-Erling Smørgrav 			/* copy AR */
3329b7579f77SDag-Erling Smørgrav 			memcpy(dest, to->rep->rrsets+to->rep->an_numrrsets+
3330b7579f77SDag-Erling Smørgrav 				to->rep->ns_numrrsets,
3331b7579f77SDag-Erling Smørgrav 				to->rep->ar_numrrsets * sizeof(dest[0]));
3332b7579f77SDag-Erling Smørgrav 			dest += to->rep->ar_numrrsets;
3333b7579f77SDag-Erling Smørgrav 			memcpy(dest, from->rep->rrsets+from->rep->an_numrrsets+
3334b7579f77SDag-Erling Smørgrav 				from->rep->ns_numrrsets,
3335b7579f77SDag-Erling Smørgrav 				from->rep->ar_numrrsets * sizeof(dest[0]));
3336b7579f77SDag-Erling Smørgrav 			/* update counts */
3337b7579f77SDag-Erling Smørgrav 			to->rep->rrsets = d;
3338b7579f77SDag-Erling Smørgrav 			to->rep->an_numrrsets += from->rep->an_numrrsets;
3339b7579f77SDag-Erling Smørgrav 			to->rep->ns_numrrsets += from->rep->ns_numrrsets;
3340b7579f77SDag-Erling Smørgrav 			to->rep->ar_numrrsets += from->rep->ar_numrrsets;
3341b7579f77SDag-Erling Smørgrav 			to->rep->rrset_count = n;
3342b7579f77SDag-Erling Smørgrav 		}
3343b7579f77SDag-Erling Smørgrav 		if(from->rep->security < to->rep->security) /* lowest sec */
3344b7579f77SDag-Erling Smørgrav 			to->rep->security = from->rep->security;
3345b7579f77SDag-Erling Smørgrav 		if(from->rep->qdcount != 0) /* insert qd if appropriate */
3346b7579f77SDag-Erling Smørgrav 			to->rep->qdcount = from->rep->qdcount;
3347b7579f77SDag-Erling Smørgrav 		if(from->rep->ttl < to->rep->ttl) /* use smallest TTL */
3348b7579f77SDag-Erling Smørgrav 			to->rep->ttl = from->rep->ttl;
3349b7579f77SDag-Erling Smørgrav 		if(from->rep->prefetch_ttl < to->rep->prefetch_ttl)
3350b7579f77SDag-Erling Smørgrav 			to->rep->prefetch_ttl = from->rep->prefetch_ttl;
33514c75e3aaSDag-Erling Smørgrav 		if(from->rep->serve_expired_ttl < to->rep->serve_expired_ttl)
33524c75e3aaSDag-Erling Smørgrav 			to->rep->serve_expired_ttl = from->rep->serve_expired_ttl;
3353b7579f77SDag-Erling Smørgrav 	}
3354b7579f77SDag-Erling Smørgrav 	/* are we done? */
3355b7579f77SDag-Erling Smørgrav 	foriq->num_current_queries --;
3356b7579f77SDag-Erling Smørgrav 	if(foriq->num_current_queries == 0)
3357b7579f77SDag-Erling Smørgrav 		foriq->state = FINISHED_STATE;
3358b7579f77SDag-Erling Smørgrav }
3359b7579f77SDag-Erling Smørgrav 
3360b7579f77SDag-Erling Smørgrav /**
3361b7579f77SDag-Erling Smørgrav  * Collect class ANY responses and make them into one response.  This
3362b7579f77SDag-Erling Smørgrav  * state is started and it creates queries for all classes (that have
3363b7579f77SDag-Erling Smørgrav  * root hints).  The answers are then collected.
3364b7579f77SDag-Erling Smørgrav  *
3365b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3366b7579f77SDag-Erling Smørgrav  * @param id: module id.
3367b7579f77SDag-Erling Smørgrav  * @return true if the event needs more immediate processing, false if not.
3368b7579f77SDag-Erling Smørgrav  */
3369b7579f77SDag-Erling Smørgrav static int
3370b7579f77SDag-Erling Smørgrav processCollectClass(struct module_qstate* qstate, int id)
3371b7579f77SDag-Erling Smørgrav {
3372b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
3373b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
3374b7579f77SDag-Erling Smørgrav 	/* If qchase.qclass == 0 then send out queries for all classes.
3375b7579f77SDag-Erling Smørgrav 	 * Otherwise, do nothing (wait for all answers to arrive and the
3376b7579f77SDag-Erling Smørgrav 	 * processClassResponse to put them together, and that moves us
3377b7579f77SDag-Erling Smørgrav 	 * towards the Finished state when done. */
3378b7579f77SDag-Erling Smørgrav 	if(iq->qchase.qclass == 0) {
3379b7579f77SDag-Erling Smørgrav 		uint16_t c = 0;
3380b7579f77SDag-Erling Smørgrav 		iq->qchase.qclass = LDNS_RR_CLASS_ANY;
3381b7579f77SDag-Erling Smørgrav 		while(iter_get_next_root(qstate->env->hints,
3382b7579f77SDag-Erling Smørgrav 			qstate->env->fwds, &c)) {
3383b7579f77SDag-Erling Smørgrav 			/* generate query for this class */
3384b7579f77SDag-Erling Smørgrav 			log_nametypeclass(VERB_ALGO, "spawn collect query",
3385b7579f77SDag-Erling Smørgrav 				qstate->qinfo.qname, qstate->qinfo.qtype, c);
3386b7579f77SDag-Erling Smørgrav 			if(!generate_sub_request(qstate->qinfo.qname,
3387b7579f77SDag-Erling Smørgrav 				qstate->qinfo.qname_len, qstate->qinfo.qtype,
3388b7579f77SDag-Erling Smørgrav 				c, qstate, id, iq, INIT_REQUEST_STATE,
3389b7579f77SDag-Erling Smørgrav 				FINISHED_STATE, &subq,
3390b7579f77SDag-Erling Smørgrav 				(int)!(qstate->query_flags&BIT_CD))) {
33914c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "could not generate class ANY"
33924c75e3aaSDag-Erling Smørgrav 					" lookup query");
3393b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
3394b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
3395b7579f77SDag-Erling Smørgrav 			}
3396b7579f77SDag-Erling Smørgrav 			/* ignore subq, no special init required */
3397b7579f77SDag-Erling Smørgrav 			iq->num_current_queries ++;
3398b7579f77SDag-Erling Smørgrav 			if(c == 0xffff)
3399b7579f77SDag-Erling Smørgrav 				break;
3400b7579f77SDag-Erling Smørgrav 			else c++;
3401b7579f77SDag-Erling Smørgrav 		}
3402b7579f77SDag-Erling Smørgrav 		/* if no roots are configured at all, return */
3403b7579f77SDag-Erling Smørgrav 		if(iq->num_current_queries == 0) {
3404b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "No root hints or fwds, giving up "
3405b7579f77SDag-Erling Smørgrav 				"on qclass ANY");
3406b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_REFUSED);
3407b7579f77SDag-Erling Smørgrav 		}
3408b7579f77SDag-Erling Smørgrav 		/* return false, wait for queries to return */
3409b7579f77SDag-Erling Smørgrav 	}
3410b7579f77SDag-Erling Smørgrav 	/* if woke up here because of an answer, wait for more answers */
3411b7579f77SDag-Erling Smørgrav 	return 0;
3412b7579f77SDag-Erling Smørgrav }
3413b7579f77SDag-Erling Smørgrav 
3414b7579f77SDag-Erling Smørgrav /**
3415b7579f77SDag-Erling Smørgrav  * This handles the final state for first-tier responses (i.e., responses to
3416b7579f77SDag-Erling Smørgrav  * externally generated queries).
3417b7579f77SDag-Erling Smørgrav  *
3418b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3419b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
3420b7579f77SDag-Erling Smørgrav  * @param id: module id.
3421b7579f77SDag-Erling Smørgrav  * @return true if the event needs more processing, false if not. Since this
3422b7579f77SDag-Erling Smørgrav  *         is the final state for an event, it always returns false.
3423b7579f77SDag-Erling Smørgrav  */
3424b7579f77SDag-Erling Smørgrav static int
3425b7579f77SDag-Erling Smørgrav processFinished(struct module_qstate* qstate, struct iter_qstate* iq,
3426b7579f77SDag-Erling Smørgrav 	int id)
3427b7579f77SDag-Erling Smørgrav {
3428b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "finishing processing for",
3429b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
3430b7579f77SDag-Erling Smørgrav 
3431b7579f77SDag-Erling Smørgrav 	/* store negative cache element for parent side glue. */
3432bc892140SDag-Erling Smørgrav 	if(!qstate->no_cache_store && iq->query_for_pside_glue
3433bc892140SDag-Erling Smørgrav 		&& !iq->pside_glue)
3434b7579f77SDag-Erling Smørgrav 			iter_store_parentside_neg(qstate->env, &qstate->qinfo,
3435b7579f77SDag-Erling Smørgrav 				iq->deleg_msg?iq->deleg_msg->rep:
3436b7579f77SDag-Erling Smørgrav 				(iq->response?iq->response->rep:NULL));
3437b7579f77SDag-Erling Smørgrav 	if(!iq->response) {
3438b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "No response is set, servfail");
34394c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "(no response found at query finish)");
3440b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3441b7579f77SDag-Erling Smørgrav 	}
3442b7579f77SDag-Erling Smørgrav 
3443b7579f77SDag-Erling Smørgrav 	/* Make sure that the RA flag is set (since the presence of
3444b7579f77SDag-Erling Smørgrav 	 * this module means that recursion is available) */
3445b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags |= BIT_RA;
3446b7579f77SDag-Erling Smørgrav 
3447b7579f77SDag-Erling Smørgrav 	/* Clear the AA flag */
3448b7579f77SDag-Erling Smørgrav 	/* FIXME: does this action go here or in some other module? */
3449b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags &= ~BIT_AA;
3450b7579f77SDag-Erling Smørgrav 
3451b7579f77SDag-Erling Smørgrav 	/* make sure QR flag is on */
3452b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags |= BIT_QR;
3453b7579f77SDag-Erling Smørgrav 
3454b7579f77SDag-Erling Smørgrav 	/* we have finished processing this query */
3455b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_finished;
3456b7579f77SDag-Erling Smørgrav 
3457b7579f77SDag-Erling Smørgrav 	/* TODO:  we are using a private TTL, trim the response. */
3458b7579f77SDag-Erling Smørgrav 	/* if (mPrivateTTL > 0){IterUtils.setPrivateTTL(resp, mPrivateTTL); } */
3459b7579f77SDag-Erling Smørgrav 
3460b7579f77SDag-Erling Smørgrav 	/* prepend any items we have accumulated */
3461b7579f77SDag-Erling Smørgrav 	if(iq->an_prepend_list || iq->ns_prepend_list) {
3462b7579f77SDag-Erling Smørgrav 		if(!iter_prepend(iq, iq->response, qstate->region)) {
3463b7579f77SDag-Erling Smørgrav 			log_err("prepend rrsets: out of memory");
3464b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3465b7579f77SDag-Erling Smørgrav 		}
3466b7579f77SDag-Erling Smørgrav 		/* reset the query name back */
3467b7579f77SDag-Erling Smørgrav 		iq->response->qinfo = qstate->qinfo;
3468b7579f77SDag-Erling Smørgrav 		/* the security state depends on the combination */
3469b7579f77SDag-Erling Smørgrav 		iq->response->rep->security = sec_status_unchecked;
3470b7579f77SDag-Erling Smørgrav 		/* store message with the finished prepended items,
3471b7579f77SDag-Erling Smørgrav 		 * but only if we did recursion. The nonrecursion referral
3472b7579f77SDag-Erling Smørgrav 		 * from cache does not need to be stored in the msg cache. */
3473bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store && qstate->query_flags&BIT_RD) {
34748ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &qstate->qinfo,
3475b7579f77SDag-Erling Smørgrav 				iq->response->rep, 0, qstate->prefetch_leeway,
3476b7579f77SDag-Erling Smørgrav 				iq->dp&&iq->dp->has_parent_side_NS,
3477ff825849SDag-Erling Smørgrav 				qstate->region, qstate->query_flags);
3478b7579f77SDag-Erling Smørgrav 		}
3479b7579f77SDag-Erling Smørgrav 	}
3480b7579f77SDag-Erling Smørgrav 	qstate->return_rcode = LDNS_RCODE_NOERROR;
3481b7579f77SDag-Erling Smørgrav 	qstate->return_msg = iq->response;
3482b7579f77SDag-Erling Smørgrav 	return 0;
3483b7579f77SDag-Erling Smørgrav }
3484b7579f77SDag-Erling Smørgrav 
3485b7579f77SDag-Erling Smørgrav /*
34868a384985SDag-Erling Smørgrav  * Return priming query results to interested super querystates.
3487b7579f77SDag-Erling Smørgrav  *
3488b7579f77SDag-Erling Smørgrav  * Sets the delegation point and delegation message (not nonRD queries).
3489b7579f77SDag-Erling Smørgrav  * This is a callback from walk_supers.
3490b7579f77SDag-Erling Smørgrav  *
3491b7579f77SDag-Erling Smørgrav  * @param qstate: query state that finished.
3492b7579f77SDag-Erling Smørgrav  * @param id: module id.
3493b7579f77SDag-Erling Smørgrav  * @param super: the qstate to inform.
3494b7579f77SDag-Erling Smørgrav  */
3495b7579f77SDag-Erling Smørgrav void
3496b7579f77SDag-Erling Smørgrav iter_inform_super(struct module_qstate* qstate, int id,
3497b7579f77SDag-Erling Smørgrav 	struct module_qstate* super)
3498b7579f77SDag-Erling Smørgrav {
3499b7579f77SDag-Erling Smørgrav 	if(!qstate->is_priming && super->qinfo.qclass == LDNS_RR_CLASS_ANY)
3500b7579f77SDag-Erling Smørgrav 		processClassResponse(qstate, id, super);
3501b7579f77SDag-Erling Smørgrav 	else if(super->qinfo.qtype == LDNS_RR_TYPE_DS && ((struct iter_qstate*)
3502b7579f77SDag-Erling Smørgrav 		super->minfo[id])->state == DSNS_FIND_STATE)
3503b7579f77SDag-Erling Smørgrav 		processDSNSResponse(qstate, id, super);
3504b7579f77SDag-Erling Smørgrav 	else if(qstate->return_rcode != LDNS_RCODE_NOERROR)
3505b7579f77SDag-Erling Smørgrav 		error_supers(qstate, id, super);
3506b7579f77SDag-Erling Smørgrav 	else if(qstate->is_priming)
3507b7579f77SDag-Erling Smørgrav 		prime_supers(qstate, id, super);
3508b7579f77SDag-Erling Smørgrav 	else	processTargetResponse(qstate, id, super);
3509b7579f77SDag-Erling Smørgrav }
3510b7579f77SDag-Erling Smørgrav 
3511b7579f77SDag-Erling Smørgrav /**
3512b7579f77SDag-Erling Smørgrav  * Handle iterator state.
3513b7579f77SDag-Erling Smørgrav  * Handle events. This is the real processing loop for events, responsible
3514b7579f77SDag-Erling Smørgrav  * for moving events through the various states. If a processing method
3515b7579f77SDag-Erling Smørgrav  * returns true, then it will be advanced to the next state. If false, then
3516b7579f77SDag-Erling Smørgrav  * processing will stop.
3517b7579f77SDag-Erling Smørgrav  *
3518b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3519b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
3520b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
3521b7579f77SDag-Erling Smørgrav  * @param id: module id.
3522b7579f77SDag-Erling Smørgrav  */
3523b7579f77SDag-Erling Smørgrav static void
3524b7579f77SDag-Erling Smørgrav iter_handle(struct module_qstate* qstate, struct iter_qstate* iq,
3525b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
3526b7579f77SDag-Erling Smørgrav {
3527b7579f77SDag-Erling Smørgrav 	int cont = 1;
3528b7579f77SDag-Erling Smørgrav 	while(cont) {
3529b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "iter_handle processing q with state %s",
3530b7579f77SDag-Erling Smørgrav 			iter_state_to_string(iq->state));
3531b7579f77SDag-Erling Smørgrav 		switch(iq->state) {
3532b7579f77SDag-Erling Smørgrav 			case INIT_REQUEST_STATE:
3533b7579f77SDag-Erling Smørgrav 				cont = processInitRequest(qstate, iq, ie, id);
3534b7579f77SDag-Erling Smørgrav 				break;
3535b7579f77SDag-Erling Smørgrav 			case INIT_REQUEST_2_STATE:
3536b7579f77SDag-Erling Smørgrav 				cont = processInitRequest2(qstate, iq, id);
3537b7579f77SDag-Erling Smørgrav 				break;
3538b7579f77SDag-Erling Smørgrav 			case INIT_REQUEST_3_STATE:
3539b7579f77SDag-Erling Smørgrav 				cont = processInitRequest3(qstate, iq, id);
3540b7579f77SDag-Erling Smørgrav 				break;
3541b7579f77SDag-Erling Smørgrav 			case QUERYTARGETS_STATE:
3542b7579f77SDag-Erling Smørgrav 				cont = processQueryTargets(qstate, iq, ie, id);
3543b7579f77SDag-Erling Smørgrav 				break;
3544b7579f77SDag-Erling Smørgrav 			case QUERY_RESP_STATE:
3545b7579f77SDag-Erling Smørgrav 				cont = processQueryResponse(qstate, iq, id);
3546b7579f77SDag-Erling Smørgrav 				break;
3547b7579f77SDag-Erling Smørgrav 			case PRIME_RESP_STATE:
3548b7579f77SDag-Erling Smørgrav 				cont = processPrimeResponse(qstate, id);
3549b7579f77SDag-Erling Smørgrav 				break;
3550b7579f77SDag-Erling Smørgrav 			case COLLECT_CLASS_STATE:
3551b7579f77SDag-Erling Smørgrav 				cont = processCollectClass(qstate, id);
3552b7579f77SDag-Erling Smørgrav 				break;
3553b7579f77SDag-Erling Smørgrav 			case DSNS_FIND_STATE:
3554b7579f77SDag-Erling Smørgrav 				cont = processDSNSFind(qstate, iq, id);
3555b7579f77SDag-Erling Smørgrav 				break;
3556b7579f77SDag-Erling Smørgrav 			case FINISHED_STATE:
3557b7579f77SDag-Erling Smørgrav 				cont = processFinished(qstate, iq, id);
3558b7579f77SDag-Erling Smørgrav 				break;
3559b7579f77SDag-Erling Smørgrav 			default:
3560b7579f77SDag-Erling Smørgrav 				log_warn("iterator: invalid state: %d",
3561b7579f77SDag-Erling Smørgrav 					iq->state);
3562b7579f77SDag-Erling Smørgrav 				cont = 0;
3563b7579f77SDag-Erling Smørgrav 				break;
3564b7579f77SDag-Erling Smørgrav 		}
3565b7579f77SDag-Erling Smørgrav 	}
3566b7579f77SDag-Erling Smørgrav }
3567b7579f77SDag-Erling Smørgrav 
3568b7579f77SDag-Erling Smørgrav /**
3569b7579f77SDag-Erling Smørgrav  * This is the primary entry point for processing request events. Note that
3570b7579f77SDag-Erling Smørgrav  * this method should only be used by external modules.
3571b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3572b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
3573b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
3574b7579f77SDag-Erling Smørgrav  * @param id: module id.
3575b7579f77SDag-Erling Smørgrav  */
3576b7579f77SDag-Erling Smørgrav static void
3577b7579f77SDag-Erling Smørgrav process_request(struct module_qstate* qstate, struct iter_qstate* iq,
3578b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
3579b7579f77SDag-Erling Smørgrav {
3580b7579f77SDag-Erling Smørgrav 	/* external requests start in the INIT state, and finish using the
3581b7579f77SDag-Erling Smørgrav 	 * FINISHED state. */
3582b7579f77SDag-Erling Smørgrav 	iq->state = INIT_REQUEST_STATE;
3583b7579f77SDag-Erling Smørgrav 	iq->final_state = FINISHED_STATE;
3584b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "process_request: new external request event");
3585b7579f77SDag-Erling Smørgrav 	iter_handle(qstate, iq, ie, id);
3586b7579f77SDag-Erling Smørgrav }
3587b7579f77SDag-Erling Smørgrav 
3588b7579f77SDag-Erling Smørgrav /** process authoritative server reply */
3589b7579f77SDag-Erling Smørgrav static void
3590b7579f77SDag-Erling Smørgrav process_response(struct module_qstate* qstate, struct iter_qstate* iq,
3591b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id, struct outbound_entry* outbound,
3592b7579f77SDag-Erling Smørgrav 	enum module_ev event)
3593b7579f77SDag-Erling Smørgrav {
3594b7579f77SDag-Erling Smørgrav 	struct msg_parse* prs;
3595b7579f77SDag-Erling Smørgrav 	struct edns_data edns;
359617d15b25SDag-Erling Smørgrav 	sldns_buffer* pkt;
3597b7579f77SDag-Erling Smørgrav 
3598b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "process_response: new external response event");
3599b7579f77SDag-Erling Smørgrav 	iq->response = NULL;
3600b7579f77SDag-Erling Smørgrav 	iq->state = QUERY_RESP_STATE;
3601b7579f77SDag-Erling Smørgrav 	if(event == module_event_noreply || event == module_event_error) {
3602ff825849SDag-Erling Smørgrav 		if(event == module_event_noreply && iq->sent_count >= 3 &&
3603ff825849SDag-Erling Smørgrav 			qstate->env->cfg->use_caps_bits_for_id &&
3604e86b9096SDag-Erling Smørgrav 			!iq->caps_fallback && !is_caps_whitelisted(ie, iq)) {
3605ff825849SDag-Erling Smørgrav 			/* start fallback */
3606ff825849SDag-Erling Smørgrav 			iq->caps_fallback = 1;
3607ff825849SDag-Erling Smørgrav 			iq->caps_server = 0;
3608ff825849SDag-Erling Smørgrav 			iq->caps_reply = NULL;
360909a3aaf3SDag-Erling Smørgrav 			iq->caps_response = NULL;
36104c75e3aaSDag-Erling Smørgrav 			iq->caps_minimisation_state = DONOT_MINIMISE_STATE;
3611ff825849SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
3612ff825849SDag-Erling Smørgrav 			iq->num_current_queries--;
3613ff825849SDag-Erling Smørgrav 			/* need fresh attempts for the 0x20 fallback, if
3614ff825849SDag-Erling Smørgrav 			 * that was the cause for the failure */
3615ff825849SDag-Erling Smørgrav 			iter_dec_attempts(iq->dp, 3);
3616ff825849SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: timeouts, starting fallback");
3617ff825849SDag-Erling Smørgrav 			goto handle_it;
3618ff825849SDag-Erling Smørgrav 		}
3619b7579f77SDag-Erling Smørgrav 		goto handle_it;
3620b7579f77SDag-Erling Smørgrav 	}
3621b7579f77SDag-Erling Smørgrav 	if( (event != module_event_reply && event != module_event_capsfail)
3622b7579f77SDag-Erling Smørgrav 		|| !qstate->reply) {
3623b7579f77SDag-Erling Smørgrav 		log_err("Bad event combined with response");
3624b7579f77SDag-Erling Smørgrav 		outbound_list_remove(&iq->outlist, outbound);
36254c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "module iterator received wrong internal event with a response message");
3626b7579f77SDag-Erling Smørgrav 		(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3627b7579f77SDag-Erling Smørgrav 		return;
3628b7579f77SDag-Erling Smørgrav 	}
3629b7579f77SDag-Erling Smørgrav 
3630b7579f77SDag-Erling Smørgrav 	/* parse message */
3631b7579f77SDag-Erling Smørgrav 	prs = (struct msg_parse*)regional_alloc(qstate->env->scratch,
3632b7579f77SDag-Erling Smørgrav 		sizeof(struct msg_parse));
3633b7579f77SDag-Erling Smørgrav 	if(!prs) {
3634b7579f77SDag-Erling Smørgrav 		log_err("out of memory on incoming message");
3635b7579f77SDag-Erling Smørgrav 		/* like packet got dropped */
3636b7579f77SDag-Erling Smørgrav 		goto handle_it;
3637b7579f77SDag-Erling Smørgrav 	}
3638b7579f77SDag-Erling Smørgrav 	memset(prs, 0, sizeof(*prs));
3639b7579f77SDag-Erling Smørgrav 	memset(&edns, 0, sizeof(edns));
3640b7579f77SDag-Erling Smørgrav 	pkt = qstate->reply->c->buffer;
364117d15b25SDag-Erling Smørgrav 	sldns_buffer_set_position(pkt, 0);
3642b7579f77SDag-Erling Smørgrav 	if(parse_packet(pkt, prs, qstate->env->scratch) != LDNS_RCODE_NOERROR) {
3643b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "parse error on reply packet");
3644b7579f77SDag-Erling Smørgrav 		goto handle_it;
3645b7579f77SDag-Erling Smørgrav 	}
3646b7579f77SDag-Erling Smørgrav 	/* edns is not examined, but removed from message to help cache */
3647e2d15004SDag-Erling Smørgrav 	if(parse_extract_edns(prs, &edns, qstate->env->scratch) !=
3648e2d15004SDag-Erling Smørgrav 		LDNS_RCODE_NOERROR)
3649b7579f77SDag-Erling Smørgrav 		goto handle_it;
3650bc892140SDag-Erling Smørgrav 
3651bc892140SDag-Erling Smørgrav 	/* Copy the edns options we may got from the back end */
3652bc892140SDag-Erling Smørgrav 	if(edns.opt_list) {
3653bc892140SDag-Erling Smørgrav 		qstate->edns_opts_back_in = edns_opt_copy_region(edns.opt_list,
3654bc892140SDag-Erling Smørgrav 			qstate->region);
3655bc892140SDag-Erling Smørgrav 		if(!qstate->edns_opts_back_in) {
3656bc892140SDag-Erling Smørgrav 			log_err("out of memory on incoming message");
3657bc892140SDag-Erling Smørgrav 			/* like packet got dropped */
3658bc892140SDag-Erling Smørgrav 			goto handle_it;
3659bc892140SDag-Erling Smørgrav 		}
366065b390aaSDag-Erling Smørgrav 		if(!inplace_cb_edns_back_parsed_call(qstate->env, qstate)) {
366165b390aaSDag-Erling Smørgrav 			log_err("unable to call edns_back_parsed callback");
366265b390aaSDag-Erling Smørgrav 			goto handle_it;
366365b390aaSDag-Erling Smørgrav 		}
3664bc892140SDag-Erling Smørgrav 	}
3665bc892140SDag-Erling Smørgrav 
3666b7579f77SDag-Erling Smørgrav 	/* remove CD-bit, we asked for in case we handle validation ourself */
3667b7579f77SDag-Erling Smørgrav 	prs->flags &= ~BIT_CD;
3668b7579f77SDag-Erling Smørgrav 
3669b7579f77SDag-Erling Smørgrav 	/* normalize and sanitize: easy to delete items from linked lists */
367005ab2901SDag-Erling Smørgrav 	if(!scrub_message(pkt, prs, &iq->qinfo_out, iq->dp->name,
367109a3aaf3SDag-Erling Smørgrav 		qstate->env->scratch, qstate->env, ie)) {
367209a3aaf3SDag-Erling Smørgrav 		/* if 0x20 enabled, start fallback, but we have no message */
367309a3aaf3SDag-Erling Smørgrav 		if(event == module_event_capsfail && !iq->caps_fallback) {
367409a3aaf3SDag-Erling Smørgrav 			iq->caps_fallback = 1;
367509a3aaf3SDag-Erling Smørgrav 			iq->caps_server = 0;
367609a3aaf3SDag-Erling Smørgrav 			iq->caps_reply = NULL;
367709a3aaf3SDag-Erling Smørgrav 			iq->caps_response = NULL;
36784c75e3aaSDag-Erling Smørgrav 			iq->caps_minimisation_state = DONOT_MINIMISE_STATE;
367909a3aaf3SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
368009a3aaf3SDag-Erling Smørgrav 			iq->num_current_queries--;
368109a3aaf3SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: scrub failed, starting fallback with no response");
368209a3aaf3SDag-Erling Smørgrav 		}
3683b7579f77SDag-Erling Smørgrav 		goto handle_it;
368409a3aaf3SDag-Erling Smørgrav 	}
3685b7579f77SDag-Erling Smørgrav 
3686b7579f77SDag-Erling Smørgrav 	/* allocate response dns_msg in region */
3687b7579f77SDag-Erling Smørgrav 	iq->response = dns_alloc_msg(pkt, prs, qstate->region);
3688b7579f77SDag-Erling Smørgrav 	if(!iq->response)
3689b7579f77SDag-Erling Smørgrav 		goto handle_it;
3690b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_DETAIL, "response for", &qstate->qinfo);
3691b7579f77SDag-Erling Smørgrav 	log_name_addr(VERB_DETAIL, "reply from", iq->dp->name,
3692b7579f77SDag-Erling Smørgrav 		&qstate->reply->addr, qstate->reply->addrlen);
3693b7579f77SDag-Erling Smørgrav 	if(verbosity >= VERB_ALGO)
3694b7579f77SDag-Erling Smørgrav 		log_dns_msg("incoming scrubbed packet:", &iq->response->qinfo,
3695b7579f77SDag-Erling Smørgrav 			iq->response->rep);
3696b7579f77SDag-Erling Smørgrav 
3697ff825849SDag-Erling Smørgrav 	if(event == module_event_capsfail || iq->caps_fallback) {
36984c75e3aaSDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation &&
36994c75e3aaSDag-Erling Smørgrav 			iq->minimisation_state != DONOT_MINIMISE_STATE) {
37004c75e3aaSDag-Erling Smørgrav 			/* Skip QNAME minimisation for next query, since that
37014c75e3aaSDag-Erling Smørgrav 			 * one has to match the current query. */
37024c75e3aaSDag-Erling Smørgrav 			iq->minimisation_state = SKIP_MINIMISE_STATE;
37034c75e3aaSDag-Erling Smørgrav 		}
37046480faa8SDag-Erling Smørgrav 		/* for fallback we care about main answer, not additionals */
37056480faa8SDag-Erling Smørgrav 		/* removing that makes comparison more likely to succeed */
37066480faa8SDag-Erling Smørgrav 		caps_strip_reply(iq->response->rep);
37074c75e3aaSDag-Erling Smørgrav 
37084c75e3aaSDag-Erling Smørgrav 		if(iq->caps_fallback &&
37094c75e3aaSDag-Erling Smørgrav 			iq->caps_minimisation_state != iq->minimisation_state) {
37104c75e3aaSDag-Erling Smørgrav 			/* QNAME minimisation state has changed, restart caps
37114c75e3aaSDag-Erling Smørgrav 			 * fallback. */
37124c75e3aaSDag-Erling Smørgrav 			iq->caps_fallback = 0;
37134c75e3aaSDag-Erling Smørgrav 		}
37144c75e3aaSDag-Erling Smørgrav 
3715b7579f77SDag-Erling Smørgrav 		if(!iq->caps_fallback) {
3716b7579f77SDag-Erling Smørgrav 			/* start fallback */
3717b7579f77SDag-Erling Smørgrav 			iq->caps_fallback = 1;
3718b7579f77SDag-Erling Smørgrav 			iq->caps_server = 0;
3719b7579f77SDag-Erling Smørgrav 			iq->caps_reply = iq->response->rep;
372009a3aaf3SDag-Erling Smørgrav 			iq->caps_response = iq->response;
37214c75e3aaSDag-Erling Smørgrav 			iq->caps_minimisation_state = iq->minimisation_state;
3722b7579f77SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
3723b7579f77SDag-Erling Smørgrav 			iq->num_current_queries--;
3724b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: starting fallback");
3725b7579f77SDag-Erling Smørgrav 			goto handle_it;
3726b7579f77SDag-Erling Smørgrav 		} else {
3727b7579f77SDag-Erling Smørgrav 			/* check if reply is the same, otherwise, fail */
3728ff825849SDag-Erling Smørgrav 			if(!iq->caps_reply) {
3729ff825849SDag-Erling Smørgrav 				iq->caps_reply = iq->response->rep;
373009a3aaf3SDag-Erling Smørgrav 				iq->caps_response = iq->response;
3731ff825849SDag-Erling Smørgrav 				iq->caps_server = -1; /*become zero at ++,
3732ff825849SDag-Erling Smørgrav 				so that we start the full set of trials */
373309a3aaf3SDag-Erling Smørgrav 			} else if(caps_failed_rcode(iq->caps_reply) &&
373409a3aaf3SDag-Erling Smørgrav 				!caps_failed_rcode(iq->response->rep)) {
373509a3aaf3SDag-Erling Smørgrav 				/* prefer to upgrade to non-SERVFAIL */
373609a3aaf3SDag-Erling Smørgrav 				iq->caps_reply = iq->response->rep;
373709a3aaf3SDag-Erling Smørgrav 				iq->caps_response = iq->response;
373809a3aaf3SDag-Erling Smørgrav 			} else if(!caps_failed_rcode(iq->caps_reply) &&
373909a3aaf3SDag-Erling Smørgrav 				caps_failed_rcode(iq->response->rep)) {
374009a3aaf3SDag-Erling Smørgrav 				/* if we have non-SERVFAIL as answer then
374109a3aaf3SDag-Erling Smørgrav 				 * we can ignore SERVFAILs for the equality
374209a3aaf3SDag-Erling Smørgrav 				 * comparison */
374309a3aaf3SDag-Erling Smørgrav 				/* no instructions here, skip other else */
374409a3aaf3SDag-Erling Smørgrav 			} else if(caps_failed_rcode(iq->caps_reply) &&
374509a3aaf3SDag-Erling Smørgrav 				caps_failed_rcode(iq->response->rep)) {
374609a3aaf3SDag-Erling Smørgrav 				/* failure is same as other failure in fallbk*/
374709a3aaf3SDag-Erling Smørgrav 				/* no instructions here, skip other else */
3748ff825849SDag-Erling Smørgrav 			} else if(!reply_equal(iq->response->rep, iq->caps_reply,
374917d15b25SDag-Erling Smørgrav 				qstate->env->scratch)) {
3750b7579f77SDag-Erling Smørgrav 				verbose(VERB_DETAIL, "Capsforid fallback: "
3751b7579f77SDag-Erling Smørgrav 					"getting different replies, failed");
3752b7579f77SDag-Erling Smørgrav 				outbound_list_remove(&iq->outlist, outbound);
37534c75e3aaSDag-Erling Smørgrav 				errinf(qstate, "0x20 failed, then got different replies in fallback");
3754b7579f77SDag-Erling Smørgrav 				(void)error_response(qstate, id,
3755b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
3756b7579f77SDag-Erling Smørgrav 				return;
3757b7579f77SDag-Erling Smørgrav 			}
3758b7579f77SDag-Erling Smørgrav 			/* continue the fallback procedure at next server */
3759b7579f77SDag-Erling Smørgrav 			iq->caps_server++;
3760b7579f77SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
3761b7579f77SDag-Erling Smørgrav 			iq->num_current_queries--;
3762b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: reply is equal. "
3763b7579f77SDag-Erling Smørgrav 				"go to next fallback");
3764b7579f77SDag-Erling Smørgrav 			goto handle_it;
3765b7579f77SDag-Erling Smørgrav 		}
3766b7579f77SDag-Erling Smørgrav 	}
3767b7579f77SDag-Erling Smørgrav 	iq->caps_fallback = 0; /* if we were in fallback, 0x20 is OK now */
3768b7579f77SDag-Erling Smørgrav 
3769b7579f77SDag-Erling Smørgrav handle_it:
3770b7579f77SDag-Erling Smørgrav 	outbound_list_remove(&iq->outlist, outbound);
3771b7579f77SDag-Erling Smørgrav 	iter_handle(qstate, iq, ie, id);
3772b7579f77SDag-Erling Smørgrav }
3773b7579f77SDag-Erling Smørgrav 
3774b7579f77SDag-Erling Smørgrav void
3775b7579f77SDag-Erling Smørgrav iter_operate(struct module_qstate* qstate, enum module_ev event, int id,
3776b7579f77SDag-Erling Smørgrav 	struct outbound_entry* outbound)
3777b7579f77SDag-Erling Smørgrav {
3778b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
3779b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
3780b7579f77SDag-Erling Smørgrav 	verbose(VERB_QUERY, "iterator[module %d] operate: extstate:%s event:%s",
3781b7579f77SDag-Erling Smørgrav 		id, strextstate(qstate->ext_state[id]), strmodulevent(event));
3782b7579f77SDag-Erling Smørgrav 	if(iq) log_query_info(VERB_QUERY, "iterator operate: query",
3783b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
3784b7579f77SDag-Erling Smørgrav 	if(iq && qstate->qinfo.qname != iq->qchase.qname)
3785b7579f77SDag-Erling Smørgrav 		log_query_info(VERB_QUERY, "iterator operate: chased to",
3786b7579f77SDag-Erling Smørgrav 			&iq->qchase);
3787b7579f77SDag-Erling Smørgrav 
3788b7579f77SDag-Erling Smørgrav 	/* perform iterator state machine */
3789b7579f77SDag-Erling Smørgrav 	if((event == module_event_new || event == module_event_pass) &&
3790b7579f77SDag-Erling Smørgrav 		iq == NULL) {
3791b7579f77SDag-Erling Smørgrav 		if(!iter_new(qstate, id)) {
37924c75e3aaSDag-Erling Smørgrav 			errinf(qstate, "malloc failure, new iterator module allocation");
3793b7579f77SDag-Erling Smørgrav 			(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3794b7579f77SDag-Erling Smørgrav 			return;
3795b7579f77SDag-Erling Smørgrav 		}
3796b7579f77SDag-Erling Smørgrav 		iq = (struct iter_qstate*)qstate->minfo[id];
3797b7579f77SDag-Erling Smørgrav 		process_request(qstate, iq, ie, id);
3798b7579f77SDag-Erling Smørgrav 		return;
3799b7579f77SDag-Erling Smørgrav 	}
3800b7579f77SDag-Erling Smørgrav 	if(iq && event == module_event_pass) {
3801b7579f77SDag-Erling Smørgrav 		iter_handle(qstate, iq, ie, id);
3802b7579f77SDag-Erling Smørgrav 		return;
3803b7579f77SDag-Erling Smørgrav 	}
3804b7579f77SDag-Erling Smørgrav 	if(iq && outbound) {
3805b7579f77SDag-Erling Smørgrav 		process_response(qstate, iq, ie, id, outbound, event);
3806b7579f77SDag-Erling Smørgrav 		return;
3807b7579f77SDag-Erling Smørgrav 	}
3808b7579f77SDag-Erling Smørgrav 	if(event == module_event_error) {
3809b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "got called with event error, giving up");
38104c75e3aaSDag-Erling Smørgrav 		errinf(qstate, "iterator module got the error event");
3811b7579f77SDag-Erling Smørgrav 		(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3812b7579f77SDag-Erling Smørgrav 		return;
3813b7579f77SDag-Erling Smørgrav 	}
3814b7579f77SDag-Erling Smørgrav 
3815b7579f77SDag-Erling Smørgrav 	log_err("bad event for iterator");
38164c75e3aaSDag-Erling Smørgrav 	errinf(qstate, "iterator module received wrong event");
3817b7579f77SDag-Erling Smørgrav 	(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3818b7579f77SDag-Erling Smørgrav }
3819b7579f77SDag-Erling Smørgrav 
3820b7579f77SDag-Erling Smørgrav void
3821b7579f77SDag-Erling Smørgrav iter_clear(struct module_qstate* qstate, int id)
3822b7579f77SDag-Erling Smørgrav {
3823b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq;
3824b7579f77SDag-Erling Smørgrav 	if(!qstate)
3825b7579f77SDag-Erling Smørgrav 		return;
3826b7579f77SDag-Erling Smørgrav 	iq = (struct iter_qstate*)qstate->minfo[id];
3827b7579f77SDag-Erling Smørgrav 	if(iq) {
3828b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
382952df462fSXin LI 		if(iq->target_count && --iq->target_count[0] == 0)
383052df462fSXin LI 			free(iq->target_count);
3831b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
3832b7579f77SDag-Erling Smørgrav 	}
3833b7579f77SDag-Erling Smørgrav 	qstate->minfo[id] = NULL;
3834b7579f77SDag-Erling Smørgrav }
3835b7579f77SDag-Erling Smørgrav 
3836b7579f77SDag-Erling Smørgrav size_t
3837b7579f77SDag-Erling Smørgrav iter_get_mem(struct module_env* env, int id)
3838b7579f77SDag-Erling Smørgrav {
3839b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)env->modinfo[id];
3840b7579f77SDag-Erling Smørgrav 	if(!ie)
3841b7579f77SDag-Erling Smørgrav 		return 0;
3842b7579f77SDag-Erling Smørgrav 	return sizeof(*ie) + sizeof(int)*((size_t)ie->max_dependency_depth+1)
3843b7579f77SDag-Erling Smørgrav 		+ donotq_get_mem(ie->donotq) + priv_get_mem(ie->priv);
3844b7579f77SDag-Erling Smørgrav }
3845b7579f77SDag-Erling Smørgrav 
3846b7579f77SDag-Erling Smørgrav /**
3847b7579f77SDag-Erling Smørgrav  * The iterator function block
3848b7579f77SDag-Erling Smørgrav  */
3849b7579f77SDag-Erling Smørgrav static struct module_func_block iter_block = {
3850b7579f77SDag-Erling Smørgrav 	"iterator",
3851b7579f77SDag-Erling Smørgrav 	&iter_init, &iter_deinit, &iter_operate, &iter_inform_super,
3852b7579f77SDag-Erling Smørgrav 	&iter_clear, &iter_get_mem
3853b7579f77SDag-Erling Smørgrav };
3854b7579f77SDag-Erling Smørgrav 
3855b7579f77SDag-Erling Smørgrav struct module_func_block*
3856b7579f77SDag-Erling Smørgrav iter_get_funcblock(void)
3857b7579f77SDag-Erling Smørgrav {
3858b7579f77SDag-Erling Smørgrav 	return &iter_block;
3859b7579f77SDag-Erling Smørgrav }
3860b7579f77SDag-Erling Smørgrav 
3861b7579f77SDag-Erling Smørgrav const char*
3862b7579f77SDag-Erling Smørgrav iter_state_to_string(enum iter_state state)
3863b7579f77SDag-Erling Smørgrav {
3864b7579f77SDag-Erling Smørgrav 	switch (state)
3865b7579f77SDag-Erling Smørgrav 	{
3866b7579f77SDag-Erling Smørgrav 	case INIT_REQUEST_STATE :
3867b7579f77SDag-Erling Smørgrav 		return "INIT REQUEST STATE";
3868b7579f77SDag-Erling Smørgrav 	case INIT_REQUEST_2_STATE :
3869b7579f77SDag-Erling Smørgrav 		return "INIT REQUEST STATE (stage 2)";
3870b7579f77SDag-Erling Smørgrav 	case INIT_REQUEST_3_STATE:
3871b7579f77SDag-Erling Smørgrav 		return "INIT REQUEST STATE (stage 3)";
3872b7579f77SDag-Erling Smørgrav 	case QUERYTARGETS_STATE :
3873b7579f77SDag-Erling Smørgrav 		return "QUERY TARGETS STATE";
3874b7579f77SDag-Erling Smørgrav 	case PRIME_RESP_STATE :
3875b7579f77SDag-Erling Smørgrav 		return "PRIME RESPONSE STATE";
3876b7579f77SDag-Erling Smørgrav 	case COLLECT_CLASS_STATE :
3877b7579f77SDag-Erling Smørgrav 		return "COLLECT CLASS STATE";
3878b7579f77SDag-Erling Smørgrav 	case DSNS_FIND_STATE :
3879b7579f77SDag-Erling Smørgrav 		return "DSNS FIND STATE";
3880b7579f77SDag-Erling Smørgrav 	case QUERY_RESP_STATE :
3881b7579f77SDag-Erling Smørgrav 		return "QUERY RESPONSE STATE";
3882b7579f77SDag-Erling Smørgrav 	case FINISHED_STATE :
3883b7579f77SDag-Erling Smørgrav 		return "FINISHED RESPONSE STATE";
3884b7579f77SDag-Erling Smørgrav 	default :
3885b7579f77SDag-Erling Smørgrav 		return "UNKNOWN ITER STATE";
3886b7579f77SDag-Erling Smørgrav 	}
3887b7579f77SDag-Erling Smørgrav }
3888b7579f77SDag-Erling Smørgrav 
3889b7579f77SDag-Erling Smørgrav int
3890b7579f77SDag-Erling Smørgrav iter_state_is_responsestate(enum iter_state s)
3891b7579f77SDag-Erling Smørgrav {
3892b7579f77SDag-Erling Smørgrav 	switch(s) {
3893b7579f77SDag-Erling Smørgrav 		case INIT_REQUEST_STATE :
3894b7579f77SDag-Erling Smørgrav 		case INIT_REQUEST_2_STATE :
3895b7579f77SDag-Erling Smørgrav 		case INIT_REQUEST_3_STATE :
3896b7579f77SDag-Erling Smørgrav 		case QUERYTARGETS_STATE :
3897b7579f77SDag-Erling Smørgrav 		case COLLECT_CLASS_STATE :
3898b7579f77SDag-Erling Smørgrav 			return 0;
3899b7579f77SDag-Erling Smørgrav 		default:
3900b7579f77SDag-Erling Smørgrav 			break;
3901b7579f77SDag-Erling Smørgrav 	}
3902b7579f77SDag-Erling Smørgrav 	return 1;
3903b7579f77SDag-Erling Smørgrav }
3904