xref: /freebsd/contrib/unbound/iterator/iterator.c (revision 65b390aa03158608c95d842609dcc4c7129d6476)
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  *
39b7579f77SDag-Erling Smørgrav  * This file contains a module that performs recusive 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"
56b7579f77SDag-Erling Smørgrav #include "util/module.h"
57b7579f77SDag-Erling Smørgrav #include "util/netevent.h"
58b7579f77SDag-Erling Smørgrav #include "util/net_help.h"
59b7579f77SDag-Erling Smørgrav #include "util/regional.h"
60b7579f77SDag-Erling Smørgrav #include "util/data/dname.h"
61b7579f77SDag-Erling Smørgrav #include "util/data/msgencode.h"
62b7579f77SDag-Erling Smørgrav #include "util/fptr_wlist.h"
63b7579f77SDag-Erling Smørgrav #include "util/config_file.h"
6409a3aaf3SDag-Erling Smørgrav #include "util/random.h"
6509a3aaf3SDag-Erling Smørgrav #include "sldns/rrdef.h"
6609a3aaf3SDag-Erling Smørgrav #include "sldns/wire2str.h"
6705ab2901SDag-Erling Smørgrav #include "sldns/str2wire.h"
6809a3aaf3SDag-Erling Smørgrav #include "sldns/parseutil.h"
6909a3aaf3SDag-Erling Smørgrav #include "sldns/sbuffer.h"
70b7579f77SDag-Erling Smørgrav 
71b7579f77SDag-Erling Smørgrav int
72b7579f77SDag-Erling Smørgrav iter_init(struct module_env* env, int id)
73b7579f77SDag-Erling Smørgrav {
74b7579f77SDag-Erling Smørgrav 	struct iter_env* iter_env = (struct iter_env*)calloc(1,
75b7579f77SDag-Erling Smørgrav 		sizeof(struct iter_env));
76b7579f77SDag-Erling Smørgrav 	if(!iter_env) {
77b7579f77SDag-Erling Smørgrav 		log_err("malloc failure");
78b7579f77SDag-Erling Smørgrav 		return 0;
79b7579f77SDag-Erling Smørgrav 	}
80b7579f77SDag-Erling Smørgrav 	env->modinfo[id] = (void*)iter_env;
81b7579f77SDag-Erling Smørgrav 	if(!iter_apply_cfg(iter_env, env->cfg)) {
82b7579f77SDag-Erling Smørgrav 		log_err("iterator: could not apply configuration settings.");
83b7579f77SDag-Erling Smørgrav 		return 0;
84b7579f77SDag-Erling Smørgrav 	}
8505ab2901SDag-Erling Smørgrav 
86b7579f77SDag-Erling Smørgrav 	return 1;
87b7579f77SDag-Erling Smørgrav }
88b7579f77SDag-Erling Smørgrav 
8909a3aaf3SDag-Erling Smørgrav /** delete caps_whitelist element */
9009a3aaf3SDag-Erling Smørgrav static void
913005e0a3SDag-Erling Smørgrav caps_free(struct rbnode_type* n, void* ATTR_UNUSED(d))
9209a3aaf3SDag-Erling Smørgrav {
9309a3aaf3SDag-Erling Smørgrav 	if(n) {
9409a3aaf3SDag-Erling Smørgrav 		free(((struct name_tree_node*)n)->name);
9509a3aaf3SDag-Erling Smørgrav 		free(n);
9609a3aaf3SDag-Erling Smørgrav 	}
9709a3aaf3SDag-Erling Smørgrav }
9809a3aaf3SDag-Erling Smørgrav 
99b7579f77SDag-Erling Smørgrav void
100b7579f77SDag-Erling Smørgrav iter_deinit(struct module_env* env, int id)
101b7579f77SDag-Erling Smørgrav {
102b7579f77SDag-Erling Smørgrav 	struct iter_env* iter_env;
103b7579f77SDag-Erling Smørgrav 	if(!env || !env->modinfo[id])
104b7579f77SDag-Erling Smørgrav 		return;
105b7579f77SDag-Erling Smørgrav 	iter_env = (struct iter_env*)env->modinfo[id];
106b7579f77SDag-Erling Smørgrav 	free(iter_env->target_fetch_policy);
107b7579f77SDag-Erling Smørgrav 	priv_delete(iter_env->priv);
108b7579f77SDag-Erling Smørgrav 	donotq_delete(iter_env->donotq);
10909a3aaf3SDag-Erling Smørgrav 	if(iter_env->caps_white) {
11009a3aaf3SDag-Erling Smørgrav 		traverse_postorder(iter_env->caps_white, caps_free, NULL);
11109a3aaf3SDag-Erling Smørgrav 		free(iter_env->caps_white);
11209a3aaf3SDag-Erling Smørgrav 	}
113b7579f77SDag-Erling Smørgrav 	free(iter_env);
114b7579f77SDag-Erling Smørgrav 	env->modinfo[id] = NULL;
115b7579f77SDag-Erling Smørgrav }
116b7579f77SDag-Erling Smørgrav 
117b7579f77SDag-Erling Smørgrav /** new query for iterator */
118b7579f77SDag-Erling Smørgrav static int
119b7579f77SDag-Erling Smørgrav iter_new(struct module_qstate* qstate, int id)
120b7579f77SDag-Erling Smørgrav {
121b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)regional_alloc(
122b7579f77SDag-Erling Smørgrav 		qstate->region, sizeof(struct iter_qstate));
123b7579f77SDag-Erling Smørgrav 	qstate->minfo[id] = iq;
124b7579f77SDag-Erling Smørgrav 	if(!iq)
125b7579f77SDag-Erling Smørgrav 		return 0;
126b7579f77SDag-Erling Smørgrav 	memset(iq, 0, sizeof(*iq));
127b7579f77SDag-Erling Smørgrav 	iq->state = INIT_REQUEST_STATE;
128b7579f77SDag-Erling Smørgrav 	iq->final_state = FINISHED_STATE;
129b7579f77SDag-Erling Smørgrav 	iq->an_prepend_list = NULL;
130b7579f77SDag-Erling Smørgrav 	iq->an_prepend_last = NULL;
131b7579f77SDag-Erling Smørgrav 	iq->ns_prepend_list = NULL;
132b7579f77SDag-Erling Smørgrav 	iq->ns_prepend_last = NULL;
133b7579f77SDag-Erling Smørgrav 	iq->dp = NULL;
134b7579f77SDag-Erling Smørgrav 	iq->depth = 0;
135b7579f77SDag-Erling Smørgrav 	iq->num_target_queries = 0;
136b7579f77SDag-Erling Smørgrav 	iq->num_current_queries = 0;
137b7579f77SDag-Erling Smørgrav 	iq->query_restart_count = 0;
138b7579f77SDag-Erling Smørgrav 	iq->referral_count = 0;
139b7579f77SDag-Erling Smørgrav 	iq->sent_count = 0;
14009a3aaf3SDag-Erling Smørgrav 	iq->ratelimit_ok = 0;
14152df462fSXin LI 	iq->target_count = NULL;
142b7579f77SDag-Erling Smørgrav 	iq->wait_priming_stub = 0;
143b7579f77SDag-Erling Smørgrav 	iq->refetch_glue = 0;
144b7579f77SDag-Erling Smørgrav 	iq->dnssec_expected = 0;
145b7579f77SDag-Erling Smørgrav 	iq->dnssec_lame_query = 0;
146b7579f77SDag-Erling Smørgrav 	iq->chase_flags = qstate->query_flags;
147b7579f77SDag-Erling Smørgrav 	/* Start with the (current) qname. */
148b7579f77SDag-Erling Smørgrav 	iq->qchase = qstate->qinfo;
149b7579f77SDag-Erling Smørgrav 	outbound_list_init(&iq->outlist);
150e2d15004SDag-Erling Smørgrav 	iq->minimise_count = 0;
151b5663de9SDag-Erling Smørgrav 	iq->minimise_timeout_count = 0;
15205ab2901SDag-Erling Smørgrav 	if (qstate->env->cfg->qname_minimisation)
15305ab2901SDag-Erling Smørgrav 		iq->minimisation_state = INIT_MINIMISE_STATE;
15405ab2901SDag-Erling Smørgrav 	else
15505ab2901SDag-Erling Smørgrav 		iq->minimisation_state = DONOT_MINIMISE_STATE;
15605ab2901SDag-Erling Smørgrav 
15705ab2901SDag-Erling Smørgrav 	memset(&iq->qinfo_out, 0, sizeof(struct query_info));
158b7579f77SDag-Erling Smørgrav 	return 1;
159b7579f77SDag-Erling Smørgrav }
160b7579f77SDag-Erling Smørgrav 
161b7579f77SDag-Erling Smørgrav /**
162b7579f77SDag-Erling Smørgrav  * Transition to the next state. This can be used to advance a currently
163b7579f77SDag-Erling Smørgrav  * processing event. It cannot be used to reactivate a forEvent.
164b7579f77SDag-Erling Smørgrav  *
165b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state
166b7579f77SDag-Erling Smørgrav  * @param nextstate The state to transition to.
167b7579f77SDag-Erling Smørgrav  * @return true. This is so this can be called as the return value for the
168b7579f77SDag-Erling Smørgrav  *         actual process*State() methods. (Transitioning to the next state
169b7579f77SDag-Erling Smørgrav  *         implies further processing).
170b7579f77SDag-Erling Smørgrav  */
171b7579f77SDag-Erling Smørgrav static int
172b7579f77SDag-Erling Smørgrav next_state(struct iter_qstate* iq, enum iter_state nextstate)
173b7579f77SDag-Erling Smørgrav {
174b7579f77SDag-Erling Smørgrav 	/* If transitioning to a "response" state, make sure that there is a
175b7579f77SDag-Erling Smørgrav 	 * response */
176b7579f77SDag-Erling Smørgrav 	if(iter_state_is_responsestate(nextstate)) {
177b7579f77SDag-Erling Smørgrav 		if(iq->response == NULL) {
178b7579f77SDag-Erling Smørgrav 			log_err("transitioning to response state sans "
179b7579f77SDag-Erling Smørgrav 				"response.");
180b7579f77SDag-Erling Smørgrav 		}
181b7579f77SDag-Erling Smørgrav 	}
182b7579f77SDag-Erling Smørgrav 	iq->state = nextstate;
183b7579f77SDag-Erling Smørgrav 	return 1;
184b7579f77SDag-Erling Smørgrav }
185b7579f77SDag-Erling Smørgrav 
186b7579f77SDag-Erling Smørgrav /**
187b7579f77SDag-Erling Smørgrav  * Transition an event to its final state. Final states always either return
188b7579f77SDag-Erling Smørgrav  * a result up the module chain, or reactivate a dependent event. Which
18905ab2901SDag-Erling Smørgrav  * final state to transition to is set in the module state for the event when
190b7579f77SDag-Erling Smørgrav  * it was created, and depends on the original purpose of the event.
191b7579f77SDag-Erling Smørgrav  *
192b7579f77SDag-Erling Smørgrav  * The response is stored in the qstate->buf buffer.
193b7579f77SDag-Erling Smørgrav  *
194b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state
195b7579f77SDag-Erling Smørgrav  * @return false. This is so this method can be used as the return value for
196b7579f77SDag-Erling Smørgrav  *         the processState methods. (Transitioning to the final state
197b7579f77SDag-Erling Smørgrav  */
198b7579f77SDag-Erling Smørgrav static int
199b7579f77SDag-Erling Smørgrav final_state(struct iter_qstate* iq)
200b7579f77SDag-Erling Smørgrav {
201b7579f77SDag-Erling Smørgrav 	return next_state(iq, iq->final_state);
202b7579f77SDag-Erling Smørgrav }
203b7579f77SDag-Erling Smørgrav 
204b7579f77SDag-Erling Smørgrav /**
205b7579f77SDag-Erling Smørgrav  * Callback routine to handle errors in parent query states
206b7579f77SDag-Erling Smørgrav  * @param qstate: query state that failed.
207b7579f77SDag-Erling Smørgrav  * @param id: module id.
208b7579f77SDag-Erling Smørgrav  * @param super: super state.
209b7579f77SDag-Erling Smørgrav  */
210b7579f77SDag-Erling Smørgrav static void
211b7579f77SDag-Erling Smørgrav error_supers(struct module_qstate* qstate, int id, struct module_qstate* super)
212b7579f77SDag-Erling Smørgrav {
213b7579f77SDag-Erling Smørgrav 	struct iter_qstate* super_iq = (struct iter_qstate*)super->minfo[id];
214b7579f77SDag-Erling Smørgrav 
215b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_A ||
216b7579f77SDag-Erling Smørgrav 		qstate->qinfo.qtype == LDNS_RR_TYPE_AAAA) {
217b7579f77SDag-Erling Smørgrav 		/* mark address as failed. */
218b7579f77SDag-Erling Smørgrav 		struct delegpt_ns* dpns = NULL;
219b5663de9SDag-Erling Smørgrav 		super_iq->num_target_queries--;
220b7579f77SDag-Erling Smørgrav 		if(super_iq->dp)
221b7579f77SDag-Erling Smørgrav 			dpns = delegpt_find_ns(super_iq->dp,
222b7579f77SDag-Erling Smørgrav 				qstate->qinfo.qname, qstate->qinfo.qname_len);
223b7579f77SDag-Erling Smørgrav 		if(!dpns) {
224b7579f77SDag-Erling Smørgrav 			/* not interested */
225b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "subq error, but not interested");
226b7579f77SDag-Erling Smørgrav 			log_query_info(VERB_ALGO, "superq", &super->qinfo);
227b7579f77SDag-Erling Smørgrav 			if(super_iq->dp)
228b7579f77SDag-Erling Smørgrav 				delegpt_log(VERB_ALGO, super_iq->dp);
229b7579f77SDag-Erling Smørgrav 			log_assert(0);
230b7579f77SDag-Erling Smørgrav 			return;
231b7579f77SDag-Erling Smørgrav 		} else {
232b7579f77SDag-Erling Smørgrav 			/* see if the failure did get (parent-lame) info */
233bc892140SDag-Erling Smørgrav 			if(!cache_fill_missing(super->env, super_iq->qchase.qclass,
234bc892140SDag-Erling Smørgrav 				super->region, super_iq->dp))
235b7579f77SDag-Erling Smørgrav 				log_err("out of memory adding missing");
236b7579f77SDag-Erling Smørgrav 		}
237b7579f77SDag-Erling Smørgrav 		dpns->resolved = 1; /* mark as failed */
238b7579f77SDag-Erling Smørgrav 	}
239b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_NS) {
240b7579f77SDag-Erling Smørgrav 		/* prime failed to get delegation */
241b7579f77SDag-Erling Smørgrav 		super_iq->dp = NULL;
242b7579f77SDag-Erling Smørgrav 	}
243b7579f77SDag-Erling Smørgrav 	/* evaluate targets again */
244b7579f77SDag-Erling Smørgrav 	super_iq->state = QUERYTARGETS_STATE;
245b7579f77SDag-Erling Smørgrav 	/* super becomes runnable, and will process this change */
246b7579f77SDag-Erling Smørgrav }
247b7579f77SDag-Erling Smørgrav 
248b7579f77SDag-Erling Smørgrav /**
249b7579f77SDag-Erling Smørgrav  * Return an error to the client
250b7579f77SDag-Erling Smørgrav  * @param qstate: our query state
251b7579f77SDag-Erling Smørgrav  * @param id: module id
252b7579f77SDag-Erling Smørgrav  * @param rcode: error code (DNS errcode).
253b7579f77SDag-Erling Smørgrav  * @return: 0 for use by caller, to make notation easy, like:
254b7579f77SDag-Erling Smørgrav  * 	return error_response(..).
255b7579f77SDag-Erling Smørgrav  */
256b7579f77SDag-Erling Smørgrav static int
257b7579f77SDag-Erling Smørgrav error_response(struct module_qstate* qstate, int id, int rcode)
258b7579f77SDag-Erling Smørgrav {
259b7579f77SDag-Erling Smørgrav 	verbose(VERB_QUERY, "return error response %s",
26017d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rcodes, rcode)?
26117d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rcodes, rcode)->name:"??");
262b7579f77SDag-Erling Smørgrav 	qstate->return_rcode = rcode;
263b7579f77SDag-Erling Smørgrav 	qstate->return_msg = NULL;
264b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_finished;
265b7579f77SDag-Erling Smørgrav 	return 0;
266b7579f77SDag-Erling Smørgrav }
267b7579f77SDag-Erling Smørgrav 
268b7579f77SDag-Erling Smørgrav /**
269b7579f77SDag-Erling Smørgrav  * Return an error to the client and cache the error code in the
270b7579f77SDag-Erling Smørgrav  * message cache (so per qname, qtype, qclass).
271b7579f77SDag-Erling Smørgrav  * @param qstate: our query state
272b7579f77SDag-Erling Smørgrav  * @param id: module id
273b7579f77SDag-Erling Smørgrav  * @param rcode: error code (DNS errcode).
274b7579f77SDag-Erling Smørgrav  * @return: 0 for use by caller, to make notation easy, like:
275b7579f77SDag-Erling Smørgrav  * 	return error_response(..).
276b7579f77SDag-Erling Smørgrav  */
277b7579f77SDag-Erling Smørgrav static int
278b7579f77SDag-Erling Smørgrav error_response_cache(struct module_qstate* qstate, int id, int rcode)
279b7579f77SDag-Erling Smørgrav {
280bc892140SDag-Erling Smørgrav 	if(!qstate->no_cache_store) {
281b7579f77SDag-Erling Smørgrav 		/* store in cache */
282b7579f77SDag-Erling Smørgrav 		struct reply_info err;
283ff825849SDag-Erling Smørgrav 		if(qstate->prefetch_leeway > NORR_TTL) {
284ff825849SDag-Erling Smørgrav 			verbose(VERB_ALGO, "error response for prefetch in cache");
285ff825849SDag-Erling Smørgrav 			/* attempt to adjust the cache entry prefetch */
286ff825849SDag-Erling Smørgrav 			if(dns_cache_prefetch_adjust(qstate->env, &qstate->qinfo,
287ff825849SDag-Erling Smørgrav 				NORR_TTL, qstate->query_flags))
288ff825849SDag-Erling Smørgrav 				return error_response(qstate, id, rcode);
289ff825849SDag-Erling Smørgrav 			/* if that fails (not in cache), fall through to store err */
290ff825849SDag-Erling Smørgrav 		}
291b7579f77SDag-Erling Smørgrav 		memset(&err, 0, sizeof(err));
292b7579f77SDag-Erling Smørgrav 		err.flags = (uint16_t)(BIT_QR | BIT_RA);
293b7579f77SDag-Erling Smørgrav 		FLAGS_SET_RCODE(err.flags, rcode);
294b7579f77SDag-Erling Smørgrav 		err.qdcount = 1;
295b7579f77SDag-Erling Smørgrav 		err.ttl = NORR_TTL;
296b7579f77SDag-Erling Smørgrav 		err.prefetch_ttl = PREFETCH_TTL_CALC(err.ttl);
297b7579f77SDag-Erling Smørgrav 		/* do not waste time trying to validate this servfail */
298b7579f77SDag-Erling Smørgrav 		err.security = sec_status_indeterminate;
299b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "store error response in message cache");
300ff825849SDag-Erling Smørgrav 		iter_dns_store(qstate->env, &qstate->qinfo, &err, 0, 0, 0, NULL,
301ff825849SDag-Erling Smørgrav 			qstate->query_flags);
302bc892140SDag-Erling Smørgrav 	}
303b7579f77SDag-Erling Smørgrav 	return error_response(qstate, id, rcode);
304b7579f77SDag-Erling Smørgrav }
305b7579f77SDag-Erling Smørgrav 
306b7579f77SDag-Erling Smørgrav /** check if prepend item is duplicate item */
307b7579f77SDag-Erling Smørgrav static int
308b7579f77SDag-Erling Smørgrav prepend_is_duplicate(struct ub_packed_rrset_key** sets, size_t to,
309b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* dup)
310b7579f77SDag-Erling Smørgrav {
311b7579f77SDag-Erling Smørgrav 	size_t i;
312b7579f77SDag-Erling Smørgrav 	for(i=0; i<to; i++) {
313b7579f77SDag-Erling Smørgrav 		if(sets[i]->rk.type == dup->rk.type &&
314b7579f77SDag-Erling Smørgrav 			sets[i]->rk.rrset_class == dup->rk.rrset_class &&
315b7579f77SDag-Erling Smørgrav 			sets[i]->rk.dname_len == dup->rk.dname_len &&
316b7579f77SDag-Erling Smørgrav 			query_dname_compare(sets[i]->rk.dname, dup->rk.dname)
317b7579f77SDag-Erling Smørgrav 			== 0)
318b7579f77SDag-Erling Smørgrav 			return 1;
319b7579f77SDag-Erling Smørgrav 	}
320b7579f77SDag-Erling Smørgrav 	return 0;
321b7579f77SDag-Erling Smørgrav }
322b7579f77SDag-Erling Smørgrav 
323b7579f77SDag-Erling Smørgrav /** prepend the prepend list in the answer and authority section of dns_msg */
324b7579f77SDag-Erling Smørgrav static int
325b7579f77SDag-Erling Smørgrav iter_prepend(struct iter_qstate* iq, struct dns_msg* msg,
326b7579f77SDag-Erling Smørgrav 	struct regional* region)
327b7579f77SDag-Erling Smørgrav {
328b7579f77SDag-Erling Smørgrav 	struct iter_prep_list* p;
329b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key** sets;
330b7579f77SDag-Erling Smørgrav 	size_t num_an = 0, num_ns = 0;;
331b7579f77SDag-Erling Smørgrav 	for(p = iq->an_prepend_list; p; p = p->next)
332b7579f77SDag-Erling Smørgrav 		num_an++;
333b7579f77SDag-Erling Smørgrav 	for(p = iq->ns_prepend_list; p; p = p->next)
334b7579f77SDag-Erling Smørgrav 		num_ns++;
335b7579f77SDag-Erling Smørgrav 	if(num_an + num_ns == 0)
336b7579f77SDag-Erling Smørgrav 		return 1;
337b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "prepending %d rrsets", (int)num_an + (int)num_ns);
33809a3aaf3SDag-Erling Smørgrav 	if(num_an > RR_COUNT_MAX || num_ns > RR_COUNT_MAX ||
33909a3aaf3SDag-Erling Smørgrav 		msg->rep->rrset_count > RR_COUNT_MAX) return 0; /* overflow */
340b7579f77SDag-Erling Smørgrav 	sets = regional_alloc(region, (num_an+num_ns+msg->rep->rrset_count) *
341b7579f77SDag-Erling Smørgrav 		sizeof(struct ub_packed_rrset_key*));
342b7579f77SDag-Erling Smørgrav 	if(!sets)
343b7579f77SDag-Erling Smørgrav 		return 0;
344b7579f77SDag-Erling Smørgrav 	/* ANSWER section */
345b7579f77SDag-Erling Smørgrav 	num_an = 0;
346b7579f77SDag-Erling Smørgrav 	for(p = iq->an_prepend_list; p; p = p->next) {
347b7579f77SDag-Erling Smørgrav 		sets[num_an++] = p->rrset;
348b7579f77SDag-Erling Smørgrav 	}
349b7579f77SDag-Erling Smørgrav 	memcpy(sets+num_an, msg->rep->rrsets, msg->rep->an_numrrsets *
350b7579f77SDag-Erling Smørgrav 		sizeof(struct ub_packed_rrset_key*));
351b7579f77SDag-Erling Smørgrav 	/* AUTH section */
352b7579f77SDag-Erling Smørgrav 	num_ns = 0;
353b7579f77SDag-Erling Smørgrav 	for(p = iq->ns_prepend_list; p; p = p->next) {
354b7579f77SDag-Erling Smørgrav 		if(prepend_is_duplicate(sets+msg->rep->an_numrrsets+num_an,
355b7579f77SDag-Erling Smørgrav 			num_ns, p->rrset) || prepend_is_duplicate(
356b7579f77SDag-Erling Smørgrav 			msg->rep->rrsets+msg->rep->an_numrrsets,
357b7579f77SDag-Erling Smørgrav 			msg->rep->ns_numrrsets, p->rrset))
358b7579f77SDag-Erling Smørgrav 			continue;
359b7579f77SDag-Erling Smørgrav 		sets[msg->rep->an_numrrsets + num_an + num_ns++] = p->rrset;
360b7579f77SDag-Erling Smørgrav 	}
361b7579f77SDag-Erling Smørgrav 	memcpy(sets + num_an + msg->rep->an_numrrsets + num_ns,
362b7579f77SDag-Erling Smørgrav 		msg->rep->rrsets + msg->rep->an_numrrsets,
363b7579f77SDag-Erling Smørgrav 		(msg->rep->ns_numrrsets + msg->rep->ar_numrrsets) *
364b7579f77SDag-Erling Smørgrav 		sizeof(struct ub_packed_rrset_key*));
365b7579f77SDag-Erling Smørgrav 
366b7579f77SDag-Erling Smørgrav 	/* NXDOMAIN rcode can stay if we prepended DNAME/CNAMEs, because
367b7579f77SDag-Erling Smørgrav 	 * this is what recursors should give. */
368b7579f77SDag-Erling Smørgrav 	msg->rep->rrset_count += num_an + num_ns;
369b7579f77SDag-Erling Smørgrav 	msg->rep->an_numrrsets += num_an;
370b7579f77SDag-Erling Smørgrav 	msg->rep->ns_numrrsets += num_ns;
371b7579f77SDag-Erling Smørgrav 	msg->rep->rrsets = sets;
372b7579f77SDag-Erling Smørgrav 	return 1;
373b7579f77SDag-Erling Smørgrav }
374b7579f77SDag-Erling Smørgrav 
375b7579f77SDag-Erling Smørgrav /**
376*65b390aaSDag-Erling Smørgrav  * Find rrset in ANSWER prepend list.
377*65b390aaSDag-Erling Smørgrav  * to avoid duplicate DNAMEs when a DNAME is traversed twice.
378*65b390aaSDag-Erling Smørgrav  * @param iq: iterator query state.
379*65b390aaSDag-Erling Smørgrav  * @param rrset: rrset to add.
380*65b390aaSDag-Erling Smørgrav  * @return false if not found
381*65b390aaSDag-Erling Smørgrav  */
382*65b390aaSDag-Erling Smørgrav static int
383*65b390aaSDag-Erling Smørgrav iter_find_rrset_in_prepend_answer(struct iter_qstate* iq,
384*65b390aaSDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset)
385*65b390aaSDag-Erling Smørgrav {
386*65b390aaSDag-Erling Smørgrav 	struct iter_prep_list* p = iq->an_prepend_list;
387*65b390aaSDag-Erling Smørgrav 	while(p) {
388*65b390aaSDag-Erling Smørgrav 		if(ub_rrset_compare(p->rrset, rrset) == 0 &&
389*65b390aaSDag-Erling Smørgrav 			rrsetdata_equal((struct packed_rrset_data*)p->rrset
390*65b390aaSDag-Erling Smørgrav 			->entry.data, (struct packed_rrset_data*)rrset
391*65b390aaSDag-Erling Smørgrav 			->entry.data))
392*65b390aaSDag-Erling Smørgrav 			return 1;
393*65b390aaSDag-Erling Smørgrav 		p = p->next;
394*65b390aaSDag-Erling Smørgrav 	}
395*65b390aaSDag-Erling Smørgrav 	return 0;
396*65b390aaSDag-Erling Smørgrav }
397*65b390aaSDag-Erling Smørgrav 
398*65b390aaSDag-Erling Smørgrav /**
399b7579f77SDag-Erling Smørgrav  * Add rrset to ANSWER prepend list
400b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
401b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
402b7579f77SDag-Erling Smørgrav  * @param rrset: rrset to add.
403b7579f77SDag-Erling Smørgrav  * @return false on failure (malloc).
404b7579f77SDag-Erling Smørgrav  */
405b7579f77SDag-Erling Smørgrav static int
406b7579f77SDag-Erling Smørgrav iter_add_prepend_answer(struct module_qstate* qstate, struct iter_qstate* iq,
407b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset)
408b7579f77SDag-Erling Smørgrav {
409b7579f77SDag-Erling Smørgrav 	struct iter_prep_list* p = (struct iter_prep_list*)regional_alloc(
410b7579f77SDag-Erling Smørgrav 		qstate->region, sizeof(struct iter_prep_list));
411b7579f77SDag-Erling Smørgrav 	if(!p)
412b7579f77SDag-Erling Smørgrav 		return 0;
413b7579f77SDag-Erling Smørgrav 	p->rrset = rrset;
414b7579f77SDag-Erling Smørgrav 	p->next = NULL;
415b7579f77SDag-Erling Smørgrav 	/* add at end */
416b7579f77SDag-Erling Smørgrav 	if(iq->an_prepend_last)
417b7579f77SDag-Erling Smørgrav 		iq->an_prepend_last->next = p;
418b7579f77SDag-Erling Smørgrav 	else	iq->an_prepend_list = p;
419b7579f77SDag-Erling Smørgrav 	iq->an_prepend_last = p;
420b7579f77SDag-Erling Smørgrav 	return 1;
421b7579f77SDag-Erling Smørgrav }
422b7579f77SDag-Erling Smørgrav 
423b7579f77SDag-Erling Smørgrav /**
424b7579f77SDag-Erling Smørgrav  * Add rrset to AUTHORITY prepend list
425b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
426b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
427b7579f77SDag-Erling Smørgrav  * @param rrset: rrset to add.
428b7579f77SDag-Erling Smørgrav  * @return false on failure (malloc).
429b7579f77SDag-Erling Smørgrav  */
430b7579f77SDag-Erling Smørgrav static int
431b7579f77SDag-Erling Smørgrav iter_add_prepend_auth(struct module_qstate* qstate, struct iter_qstate* iq,
432b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset)
433b7579f77SDag-Erling Smørgrav {
434b7579f77SDag-Erling Smørgrav 	struct iter_prep_list* p = (struct iter_prep_list*)regional_alloc(
435b7579f77SDag-Erling Smørgrav 		qstate->region, sizeof(struct iter_prep_list));
436b7579f77SDag-Erling Smørgrav 	if(!p)
437b7579f77SDag-Erling Smørgrav 		return 0;
438b7579f77SDag-Erling Smørgrav 	p->rrset = rrset;
439b7579f77SDag-Erling Smørgrav 	p->next = NULL;
440b7579f77SDag-Erling Smørgrav 	/* add at end */
441b7579f77SDag-Erling Smørgrav 	if(iq->ns_prepend_last)
442b7579f77SDag-Erling Smørgrav 		iq->ns_prepend_last->next = p;
443b7579f77SDag-Erling Smørgrav 	else	iq->ns_prepend_list = p;
444b7579f77SDag-Erling Smørgrav 	iq->ns_prepend_last = p;
445b7579f77SDag-Erling Smørgrav 	return 1;
446b7579f77SDag-Erling Smørgrav }
447b7579f77SDag-Erling Smørgrav 
448b7579f77SDag-Erling Smørgrav /**
449b7579f77SDag-Erling Smørgrav  * Given a CNAME response (defined as a response containing a CNAME or DNAME
450b7579f77SDag-Erling Smørgrav  * that does not answer the request), process the response, modifying the
451b7579f77SDag-Erling Smørgrav  * state as necessary. This follows the CNAME/DNAME chain and returns the
452b7579f77SDag-Erling Smørgrav  * final query name.
453b7579f77SDag-Erling Smørgrav  *
454b7579f77SDag-Erling Smørgrav  * sets the new query name, after following the CNAME/DNAME chain.
455b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
456b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
457b7579f77SDag-Erling Smørgrav  * @param msg: the response.
458b7579f77SDag-Erling Smørgrav  * @param mname: returned target new query name.
459b7579f77SDag-Erling Smørgrav  * @param mname_len: length of mname.
460b7579f77SDag-Erling Smørgrav  * @return false on (malloc) error.
461b7579f77SDag-Erling Smørgrav  */
462b7579f77SDag-Erling Smørgrav static int
463b7579f77SDag-Erling Smørgrav handle_cname_response(struct module_qstate* qstate, struct iter_qstate* iq,
464b7579f77SDag-Erling Smørgrav         struct dns_msg* msg, uint8_t** mname, size_t* mname_len)
465b7579f77SDag-Erling Smørgrav {
466b7579f77SDag-Erling Smørgrav 	size_t i;
467b7579f77SDag-Erling Smørgrav 	/* Start with the (current) qname. */
468b7579f77SDag-Erling Smørgrav 	*mname = iq->qchase.qname;
469b7579f77SDag-Erling Smørgrav 	*mname_len = iq->qchase.qname_len;
470b7579f77SDag-Erling Smørgrav 
471b7579f77SDag-Erling Smørgrav 	/* Iterate over the ANSWER rrsets in order, looking for CNAMEs and
472b7579f77SDag-Erling Smørgrav 	 * DNAMES. */
473b7579f77SDag-Erling Smørgrav 	for(i=0; i<msg->rep->an_numrrsets; i++) {
474b7579f77SDag-Erling Smørgrav 		struct ub_packed_rrset_key* r = msg->rep->rrsets[i];
475b7579f77SDag-Erling Smørgrav 		/* If there is a (relevant) DNAME, add it to the list.
476b7579f77SDag-Erling Smørgrav 		 * We always expect there to be CNAME that was generated
477b7579f77SDag-Erling Smørgrav 		 * by this DNAME following, so we don't process the DNAME
478b7579f77SDag-Erling Smørgrav 		 * directly.  */
479b7579f77SDag-Erling Smørgrav 		if(ntohs(r->rk.type) == LDNS_RR_TYPE_DNAME &&
480*65b390aaSDag-Erling Smørgrav 			dname_strict_subdomain_c(*mname, r->rk.dname) &&
481*65b390aaSDag-Erling Smørgrav 			!iter_find_rrset_in_prepend_answer(iq, r)) {
482b7579f77SDag-Erling Smørgrav 			if(!iter_add_prepend_answer(qstate, iq, r))
483b7579f77SDag-Erling Smørgrav 				return 0;
484b7579f77SDag-Erling Smørgrav 			continue;
485b7579f77SDag-Erling Smørgrav 		}
486b7579f77SDag-Erling Smørgrav 
487b7579f77SDag-Erling Smørgrav 		if(ntohs(r->rk.type) == LDNS_RR_TYPE_CNAME &&
488*65b390aaSDag-Erling Smørgrav 			query_dname_compare(*mname, r->rk.dname) == 0 &&
489*65b390aaSDag-Erling Smørgrav 			!iter_find_rrset_in_prepend_answer(iq, r)) {
490b7579f77SDag-Erling Smørgrav 			/* Add this relevant CNAME rrset to the prepend list.*/
491b7579f77SDag-Erling Smørgrav 			if(!iter_add_prepend_answer(qstate, iq, r))
492b7579f77SDag-Erling Smørgrav 				return 0;
493b7579f77SDag-Erling Smørgrav 			get_cname_target(r, mname, mname_len);
494b7579f77SDag-Erling Smørgrav 		}
495b7579f77SDag-Erling Smørgrav 
496b7579f77SDag-Erling Smørgrav 		/* Other rrsets in the section are ignored. */
497b7579f77SDag-Erling Smørgrav 	}
498b7579f77SDag-Erling Smørgrav 	/* add authority rrsets to authority prepend, for wildcarded CNAMEs */
499b7579f77SDag-Erling Smørgrav 	for(i=msg->rep->an_numrrsets; i<msg->rep->an_numrrsets +
500b7579f77SDag-Erling Smørgrav 		msg->rep->ns_numrrsets; i++) {
501b7579f77SDag-Erling Smørgrav 		struct ub_packed_rrset_key* r = msg->rep->rrsets[i];
502b7579f77SDag-Erling Smørgrav 		/* only add NSEC/NSEC3, as they may be needed for validation */
503b7579f77SDag-Erling Smørgrav 		if(ntohs(r->rk.type) == LDNS_RR_TYPE_NSEC ||
504b7579f77SDag-Erling Smørgrav 			ntohs(r->rk.type) == LDNS_RR_TYPE_NSEC3) {
505b7579f77SDag-Erling Smørgrav 			if(!iter_add_prepend_auth(qstate, iq, r))
506b7579f77SDag-Erling Smørgrav 				return 0;
507b7579f77SDag-Erling Smørgrav 		}
508b7579f77SDag-Erling Smørgrav 	}
509b7579f77SDag-Erling Smørgrav 	return 1;
510b7579f77SDag-Erling Smørgrav }
511b7579f77SDag-Erling Smørgrav 
51209a3aaf3SDag-Erling Smørgrav /** see if target name is caps-for-id whitelisted */
51309a3aaf3SDag-Erling Smørgrav static int
51409a3aaf3SDag-Erling Smørgrav is_caps_whitelisted(struct iter_env* ie, struct iter_qstate* iq)
51509a3aaf3SDag-Erling Smørgrav {
51609a3aaf3SDag-Erling Smørgrav 	if(!ie->caps_white) return 0; /* no whitelist, or no capsforid */
51709a3aaf3SDag-Erling Smørgrav 	return name_tree_lookup(ie->caps_white, iq->qchase.qname,
51809a3aaf3SDag-Erling Smørgrav 		iq->qchase.qname_len, dname_count_labels(iq->qchase.qname),
51909a3aaf3SDag-Erling Smørgrav 		iq->qchase.qclass) != NULL;
52009a3aaf3SDag-Erling Smørgrav }
52109a3aaf3SDag-Erling Smørgrav 
52252df462fSXin LI /** create target count structure for this query */
52352df462fSXin LI static void
52452df462fSXin LI target_count_create(struct iter_qstate* iq)
52552df462fSXin LI {
52652df462fSXin LI 	if(!iq->target_count) {
52752df462fSXin LI 		iq->target_count = (int*)calloc(2, sizeof(int));
52852df462fSXin LI 		/* if calloc fails we simply do not track this number */
52952df462fSXin LI 		if(iq->target_count)
53052df462fSXin LI 			iq->target_count[0] = 1;
53152df462fSXin LI 	}
53252df462fSXin LI }
53352df462fSXin LI 
53452df462fSXin LI static void
53552df462fSXin LI target_count_increase(struct iter_qstate* iq, int num)
53652df462fSXin LI {
53752df462fSXin LI 	target_count_create(iq);
53852df462fSXin LI 	if(iq->target_count)
53952df462fSXin LI 		iq->target_count[1] += num;
54052df462fSXin LI }
54152df462fSXin LI 
542b7579f77SDag-Erling Smørgrav /**
543b7579f77SDag-Erling Smørgrav  * Generate a subrequest.
544b7579f77SDag-Erling Smørgrav  * Generate a local request event. Local events are tied to this module, and
54505ab2901SDag-Erling Smørgrav  * have a corresponding (first tier) event that is waiting for this event to
546b7579f77SDag-Erling Smørgrav  * resolve to continue.
547b7579f77SDag-Erling Smørgrav  *
548b7579f77SDag-Erling Smørgrav  * @param qname The query name for this request.
549b7579f77SDag-Erling Smørgrav  * @param qnamelen length of qname
550b7579f77SDag-Erling Smørgrav  * @param qtype The query type for this request.
551b7579f77SDag-Erling Smørgrav  * @param qclass The query class for this request.
552b7579f77SDag-Erling Smørgrav  * @param qstate The event that is generating this event.
553b7579f77SDag-Erling Smørgrav  * @param id: module id.
554b7579f77SDag-Erling Smørgrav  * @param iq: The iterator state that is generating this event.
555b7579f77SDag-Erling Smørgrav  * @param initial_state The initial response state (normally this
556b7579f77SDag-Erling Smørgrav  *          is QUERY_RESP_STATE, unless it is known that the request won't
557b7579f77SDag-Erling Smørgrav  *          need iterative processing
558b7579f77SDag-Erling Smørgrav  * @param finalstate The final state for the response to this request.
559b7579f77SDag-Erling Smørgrav  * @param subq_ret: if newly allocated, the subquerystate, or NULL if it does
560b7579f77SDag-Erling Smørgrav  * 	not need initialisation.
561b7579f77SDag-Erling Smørgrav  * @param v: if true, validation is done on the subquery.
562b7579f77SDag-Erling Smørgrav  * @return false on error (malloc).
563b7579f77SDag-Erling Smørgrav  */
564b7579f77SDag-Erling Smørgrav static int
565b7579f77SDag-Erling Smørgrav generate_sub_request(uint8_t* qname, size_t qnamelen, uint16_t qtype,
566b7579f77SDag-Erling Smørgrav 	uint16_t qclass, struct module_qstate* qstate, int id,
567b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq, enum iter_state initial_state,
568b7579f77SDag-Erling Smørgrav 	enum iter_state finalstate, struct module_qstate** subq_ret, int v)
569b7579f77SDag-Erling Smørgrav {
570b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq = NULL;
571b7579f77SDag-Erling Smørgrav 	struct iter_qstate* subiq = NULL;
572b7579f77SDag-Erling Smørgrav 	uint16_t qflags = 0; /* OPCODE QUERY, no flags */
573b7579f77SDag-Erling Smørgrav 	struct query_info qinf;
574b7579f77SDag-Erling Smørgrav 	int prime = (finalstate == PRIME_RESP_STATE)?1:0;
575ff825849SDag-Erling Smørgrav 	int valrec = 0;
576b7579f77SDag-Erling Smørgrav 	qinf.qname = qname;
577b7579f77SDag-Erling Smørgrav 	qinf.qname_len = qnamelen;
578b7579f77SDag-Erling Smørgrav 	qinf.qtype = qtype;
579b7579f77SDag-Erling Smørgrav 	qinf.qclass = qclass;
580bc892140SDag-Erling Smørgrav 	qinf.local_alias = NULL;
581b7579f77SDag-Erling Smørgrav 
582b7579f77SDag-Erling Smørgrav 	/* RD should be set only when sending the query back through the INIT
583b7579f77SDag-Erling Smørgrav 	 * state. */
584b7579f77SDag-Erling Smørgrav 	if(initial_state == INIT_REQUEST_STATE)
585b7579f77SDag-Erling Smørgrav 		qflags |= BIT_RD;
586b7579f77SDag-Erling Smørgrav 	/* We set the CD flag so we can send this through the "head" of
587b7579f77SDag-Erling Smørgrav 	 * the resolution chain, which might have a validator. We are
588b7579f77SDag-Erling Smørgrav 	 * uninterested in validating things not on the direct resolution
589b7579f77SDag-Erling Smørgrav 	 * path.  */
590ff825849SDag-Erling Smørgrav 	if(!v) {
591b7579f77SDag-Erling Smørgrav 		qflags |= BIT_CD;
592ff825849SDag-Erling Smørgrav 		valrec = 1;
593ff825849SDag-Erling Smørgrav 	}
594b7579f77SDag-Erling Smørgrav 
595b7579f77SDag-Erling Smørgrav 	/* attach subquery, lookup existing or make a new one */
596b7579f77SDag-Erling Smørgrav 	fptr_ok(fptr_whitelist_modenv_attach_sub(qstate->env->attach_sub));
597ff825849SDag-Erling Smørgrav 	if(!(*qstate->env->attach_sub)(qstate, &qinf, qflags, prime, valrec,
598ff825849SDag-Erling Smørgrav 		&subq)) {
599b7579f77SDag-Erling Smørgrav 		return 0;
600b7579f77SDag-Erling Smørgrav 	}
601b7579f77SDag-Erling Smørgrav 	*subq_ret = subq;
602b7579f77SDag-Erling Smørgrav 	if(subq) {
603b7579f77SDag-Erling Smørgrav 		/* initialise the new subquery */
604b7579f77SDag-Erling Smørgrav 		subq->curmod = id;
605b7579f77SDag-Erling Smørgrav 		subq->ext_state[id] = module_state_initial;
606b7579f77SDag-Erling Smørgrav 		subq->minfo[id] = regional_alloc(subq->region,
607b7579f77SDag-Erling Smørgrav 			sizeof(struct iter_qstate));
608b7579f77SDag-Erling Smørgrav 		if(!subq->minfo[id]) {
609b7579f77SDag-Erling Smørgrav 			log_err("init subq: out of memory");
610b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
611b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
612b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
613b7579f77SDag-Erling Smørgrav 			return 0;
614b7579f77SDag-Erling Smørgrav 		}
615b7579f77SDag-Erling Smørgrav 		subiq = (struct iter_qstate*)subq->minfo[id];
616b7579f77SDag-Erling Smørgrav 		memset(subiq, 0, sizeof(*subiq));
617b7579f77SDag-Erling Smørgrav 		subiq->num_target_queries = 0;
61852df462fSXin LI 		target_count_create(iq);
61952df462fSXin LI 		subiq->target_count = iq->target_count;
62052df462fSXin LI 		if(iq->target_count)
62152df462fSXin LI 			iq->target_count[0] ++; /* extra reference */
622b7579f77SDag-Erling Smørgrav 		subiq->num_current_queries = 0;
623b7579f77SDag-Erling Smørgrav 		subiq->depth = iq->depth+1;
624b7579f77SDag-Erling Smørgrav 		outbound_list_init(&subiq->outlist);
625b7579f77SDag-Erling Smørgrav 		subiq->state = initial_state;
626b7579f77SDag-Erling Smørgrav 		subiq->final_state = finalstate;
627b7579f77SDag-Erling Smørgrav 		subiq->qchase = subq->qinfo;
628b7579f77SDag-Erling Smørgrav 		subiq->chase_flags = subq->query_flags;
629b7579f77SDag-Erling Smørgrav 		subiq->refetch_glue = 0;
63005ab2901SDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation)
63105ab2901SDag-Erling Smørgrav 			subiq->minimisation_state = INIT_MINIMISE_STATE;
63205ab2901SDag-Erling Smørgrav 		else
63305ab2901SDag-Erling Smørgrav 			subiq->minimisation_state = DONOT_MINIMISE_STATE;
63405ab2901SDag-Erling Smørgrav 		memset(&subiq->qinfo_out, 0, sizeof(struct query_info));
635b7579f77SDag-Erling Smørgrav 	}
636b7579f77SDag-Erling Smørgrav 	return 1;
637b7579f77SDag-Erling Smørgrav }
638b7579f77SDag-Erling Smørgrav 
639b7579f77SDag-Erling Smørgrav /**
640b7579f77SDag-Erling Smørgrav  * Generate and send a root priming request.
641b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
642b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
643b7579f77SDag-Erling Smørgrav  * @param id: module id.
644b7579f77SDag-Erling Smørgrav  * @param qclass: the class to prime.
645b7579f77SDag-Erling Smørgrav  * @return 0 on failure
646b7579f77SDag-Erling Smørgrav  */
647b7579f77SDag-Erling Smørgrav static int
648b7579f77SDag-Erling Smørgrav prime_root(struct module_qstate* qstate, struct iter_qstate* iq, int id,
649b7579f77SDag-Erling Smørgrav 	uint16_t qclass)
650b7579f77SDag-Erling Smørgrav {
651b7579f77SDag-Erling Smørgrav 	struct delegpt* dp;
652b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
653b7579f77SDag-Erling Smørgrav 	verbose(VERB_DETAIL, "priming . %s NS",
65417d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rr_classes, (int)qclass)?
65517d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rr_classes, (int)qclass)->name:"??");
656b7579f77SDag-Erling Smørgrav 	dp = hints_lookup_root(qstate->env->hints, qclass);
657b7579f77SDag-Erling Smørgrav 	if(!dp) {
658b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "Cannot prime due to lack of hints");
659b7579f77SDag-Erling Smørgrav 		return 0;
660b7579f77SDag-Erling Smørgrav 	}
661b7579f77SDag-Erling Smørgrav 	/* Priming requests start at the QUERYTARGETS state, skipping
662b7579f77SDag-Erling Smørgrav 	 * the normal INIT state logic (which would cause an infloop). */
663b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request((uint8_t*)"\000", 1, LDNS_RR_TYPE_NS,
664b7579f77SDag-Erling Smørgrav 		qclass, qstate, id, iq, QUERYTARGETS_STATE, PRIME_RESP_STATE,
665b7579f77SDag-Erling Smørgrav 		&subq, 0)) {
666b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not prime root");
667b7579f77SDag-Erling Smørgrav 		return 0;
668b7579f77SDag-Erling Smørgrav 	}
669b7579f77SDag-Erling Smørgrav 	if(subq) {
670b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
671b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
672b7579f77SDag-Erling Smørgrav 		/* Set the initial delegation point to the hint.
673b7579f77SDag-Erling Smørgrav 		 * copy dp, it is now part of the root prime query.
674b7579f77SDag-Erling Smørgrav 		 * dp was part of in the fixed hints structure. */
675b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(dp, subq->region);
676b7579f77SDag-Erling Smørgrav 		if(!subiq->dp) {
677b7579f77SDag-Erling Smørgrav 			log_err("out of memory priming root, copydp");
678b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
679b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
680b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
681b7579f77SDag-Erling Smørgrav 			return 0;
682b7579f77SDag-Erling Smørgrav 		}
683b7579f77SDag-Erling Smørgrav 		/* there should not be any target queries. */
684b7579f77SDag-Erling Smørgrav 		subiq->num_target_queries = 0;
685b7579f77SDag-Erling Smørgrav 		subiq->dnssec_expected = iter_indicates_dnssec(
686b7579f77SDag-Erling Smørgrav 			qstate->env, subiq->dp, NULL, subq->qinfo.qclass);
687b7579f77SDag-Erling Smørgrav 	}
688b7579f77SDag-Erling Smørgrav 
689b7579f77SDag-Erling Smørgrav 	/* this module stops, our submodule starts, and does the query. */
690b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_wait_subquery;
691b7579f77SDag-Erling Smørgrav 	return 1;
692b7579f77SDag-Erling Smørgrav }
693b7579f77SDag-Erling Smørgrav 
694b7579f77SDag-Erling Smørgrav /**
695b7579f77SDag-Erling Smørgrav  * Generate and process a stub priming request. This method tests for the
696b7579f77SDag-Erling Smørgrav  * need to prime a stub zone, so it is safe to call for every request.
697b7579f77SDag-Erling Smørgrav  *
698b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
699b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
700b7579f77SDag-Erling Smørgrav  * @param id: module id.
701b7579f77SDag-Erling Smørgrav  * @param qname: request name.
702b7579f77SDag-Erling Smørgrav  * @param qclass: request class.
703b7579f77SDag-Erling Smørgrav  * @return true if a priming subrequest was made, false if not. The will only
704b7579f77SDag-Erling Smørgrav  *         issue a priming request if it detects an unprimed stub.
705b7579f77SDag-Erling Smørgrav  *         Uses value of 2 to signal during stub-prime in root-prime situation
706b7579f77SDag-Erling Smørgrav  *         that a noprime-stub is available and resolution can continue.
707b7579f77SDag-Erling Smørgrav  */
708b7579f77SDag-Erling Smørgrav static int
709b7579f77SDag-Erling Smørgrav prime_stub(struct module_qstate* qstate, struct iter_qstate* iq, int id,
710b7579f77SDag-Erling Smørgrav 	uint8_t* qname, uint16_t qclass)
711b7579f77SDag-Erling Smørgrav {
712b7579f77SDag-Erling Smørgrav 	/* Lookup the stub hint. This will return null if the stub doesn't
713b7579f77SDag-Erling Smørgrav 	 * need to be re-primed. */
714b7579f77SDag-Erling Smørgrav 	struct iter_hints_stub* stub;
715b7579f77SDag-Erling Smørgrav 	struct delegpt* stub_dp;
716b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
717b7579f77SDag-Erling Smørgrav 
718b7579f77SDag-Erling Smørgrav 	if(!qname) return 0;
719b7579f77SDag-Erling Smørgrav 	stub = hints_lookup_stub(qstate->env->hints, qname, qclass, iq->dp);
720b7579f77SDag-Erling Smørgrav 	/* The stub (if there is one) does not need priming. */
721b7579f77SDag-Erling Smørgrav 	if(!stub)
722b7579f77SDag-Erling Smørgrav 		return 0;
723b7579f77SDag-Erling Smørgrav 	stub_dp = stub->dp;
724b7579f77SDag-Erling Smørgrav 
725b7579f77SDag-Erling Smørgrav 	/* is it a noprime stub (always use) */
726b7579f77SDag-Erling Smørgrav 	if(stub->noprime) {
727b7579f77SDag-Erling Smørgrav 		int r = 0;
728b7579f77SDag-Erling Smørgrav 		if(iq->dp == NULL) r = 2;
729b7579f77SDag-Erling Smørgrav 		/* copy the dp out of the fixed hints structure, so that
730b7579f77SDag-Erling Smørgrav 		 * it can be changed when servicing this query */
731b7579f77SDag-Erling Smørgrav 		iq->dp = delegpt_copy(stub_dp, qstate->region);
732b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
733b7579f77SDag-Erling Smørgrav 			log_err("out of memory priming stub");
734b7579f77SDag-Erling Smørgrav 			(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
735b7579f77SDag-Erling Smørgrav 			return 1; /* return 1 to make module stop, with error */
736b7579f77SDag-Erling Smørgrav 		}
737b7579f77SDag-Erling Smørgrav 		log_nametypeclass(VERB_DETAIL, "use stub", stub_dp->name,
738b7579f77SDag-Erling Smørgrav 			LDNS_RR_TYPE_NS, qclass);
739b7579f77SDag-Erling Smørgrav 		return r;
740b7579f77SDag-Erling Smørgrav 	}
741b7579f77SDag-Erling Smørgrav 
742b7579f77SDag-Erling Smørgrav 	/* Otherwise, we need to (re)prime the stub. */
743b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_DETAIL, "priming stub", stub_dp->name,
744b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, qclass);
745b7579f77SDag-Erling Smørgrav 
746b7579f77SDag-Erling Smørgrav 	/* Stub priming events start at the QUERYTARGETS state to avoid the
747b7579f77SDag-Erling Smørgrav 	 * redundant INIT state processing. */
748b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(stub_dp->name, stub_dp->namelen,
749b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, qclass, qstate, id, iq,
750b7579f77SDag-Erling Smørgrav 		QUERYTARGETS_STATE, PRIME_RESP_STATE, &subq, 0)) {
751b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not prime stub");
752b7579f77SDag-Erling Smørgrav 		(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
753b7579f77SDag-Erling Smørgrav 		return 1; /* return 1 to make module stop, with error */
754b7579f77SDag-Erling Smørgrav 	}
755b7579f77SDag-Erling Smørgrav 	if(subq) {
756b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
757b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
758b7579f77SDag-Erling Smørgrav 
759b7579f77SDag-Erling Smørgrav 		/* Set the initial delegation point to the hint. */
760b7579f77SDag-Erling Smørgrav 		/* make copy to avoid use of stub dp by different qs/threads */
761b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(stub_dp, subq->region);
762b7579f77SDag-Erling Smørgrav 		if(!subiq->dp) {
763b7579f77SDag-Erling Smørgrav 			log_err("out of memory priming stub, copydp");
764b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
765b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
766b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
767b7579f77SDag-Erling Smørgrav 			(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
768b7579f77SDag-Erling Smørgrav 			return 1; /* return 1 to make module stop, with error */
769b7579f77SDag-Erling Smørgrav 		}
770b7579f77SDag-Erling Smørgrav 		/* there should not be any target queries -- although there
771b7579f77SDag-Erling Smørgrav 		 * wouldn't be anyway, since stub hints never have
772b7579f77SDag-Erling Smørgrav 		 * missing targets. */
773b7579f77SDag-Erling Smørgrav 		subiq->num_target_queries = 0;
774b7579f77SDag-Erling Smørgrav 		subiq->wait_priming_stub = 1;
775b7579f77SDag-Erling Smørgrav 		subiq->dnssec_expected = iter_indicates_dnssec(
776b7579f77SDag-Erling Smørgrav 			qstate->env, subiq->dp, NULL, subq->qinfo.qclass);
777b7579f77SDag-Erling Smørgrav 	}
778b7579f77SDag-Erling Smørgrav 
779b7579f77SDag-Erling Smørgrav 	/* this module stops, our submodule starts, and does the query. */
780b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_wait_subquery;
781b7579f77SDag-Erling Smørgrav 	return 1;
782b7579f77SDag-Erling Smørgrav }
783b7579f77SDag-Erling Smørgrav 
784b7579f77SDag-Erling Smørgrav /**
785b7579f77SDag-Erling Smørgrav  * Generate A and AAAA checks for glue that is in-zone for the referral
786b7579f77SDag-Erling Smørgrav  * we just got to obtain authoritative information on the adresses.
787b7579f77SDag-Erling Smørgrav  *
788b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
789b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
790b7579f77SDag-Erling Smørgrav  * @param id: module id.
791b7579f77SDag-Erling Smørgrav  */
792b7579f77SDag-Erling Smørgrav static void
793b7579f77SDag-Erling Smørgrav generate_a_aaaa_check(struct module_qstate* qstate, struct iter_qstate* iq,
794b7579f77SDag-Erling Smørgrav 	int id)
795b7579f77SDag-Erling Smørgrav {
796b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
797b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
798b7579f77SDag-Erling Smørgrav 	size_t i;
799b7579f77SDag-Erling Smørgrav 	struct reply_info* rep = iq->response->rep;
800b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* s;
801b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
802b7579f77SDag-Erling Smørgrav 
803b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth)
804b7579f77SDag-Erling Smørgrav 		return;
805b7579f77SDag-Erling Smørgrav 	/* walk through additional, and check if in-zone,
806b7579f77SDag-Erling Smørgrav 	 * only relevant A, AAAA are left after scrub anyway */
807b7579f77SDag-Erling Smørgrav 	for(i=rep->an_numrrsets+rep->ns_numrrsets; i<rep->rrset_count; i++) {
808b7579f77SDag-Erling Smørgrav 		s = rep->rrsets[i];
809b7579f77SDag-Erling Smørgrav 		/* check *ALL* addresses that are transmitted in additional*/
810b7579f77SDag-Erling Smørgrav 		/* is it an address ? */
811b7579f77SDag-Erling Smørgrav 		if( !(ntohs(s->rk.type)==LDNS_RR_TYPE_A ||
812b7579f77SDag-Erling Smørgrav 			ntohs(s->rk.type)==LDNS_RR_TYPE_AAAA)) {
813b7579f77SDag-Erling Smørgrav 			continue;
814b7579f77SDag-Erling Smørgrav 		}
815b7579f77SDag-Erling Smørgrav 		/* is this query the same as the A/AAAA check for it */
816b7579f77SDag-Erling Smørgrav 		if(qstate->qinfo.qtype == ntohs(s->rk.type) &&
817b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qclass == ntohs(s->rk.rrset_class) &&
818b7579f77SDag-Erling Smørgrav 			query_dname_compare(qstate->qinfo.qname,
819b7579f77SDag-Erling Smørgrav 				s->rk.dname)==0 &&
820b7579f77SDag-Erling Smørgrav 			(qstate->query_flags&BIT_RD) &&
821b7579f77SDag-Erling Smørgrav 			!(qstate->query_flags&BIT_CD))
822b7579f77SDag-Erling Smørgrav 			continue;
823b7579f77SDag-Erling Smørgrav 
824b7579f77SDag-Erling Smørgrav 		/* generate subrequest for it */
825b7579f77SDag-Erling Smørgrav 		log_nametypeclass(VERB_ALGO, "schedule addr fetch",
826b7579f77SDag-Erling Smørgrav 			s->rk.dname, ntohs(s->rk.type),
827b7579f77SDag-Erling Smørgrav 			ntohs(s->rk.rrset_class));
828b7579f77SDag-Erling Smørgrav 		if(!generate_sub_request(s->rk.dname, s->rk.dname_len,
829b7579f77SDag-Erling Smørgrav 			ntohs(s->rk.type), ntohs(s->rk.rrset_class),
830b7579f77SDag-Erling Smørgrav 			qstate, id, iq,
831b7579f77SDag-Erling Smørgrav 			INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1)) {
832b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "could not generate addr check");
833b7579f77SDag-Erling Smørgrav 			return;
834b7579f77SDag-Erling Smørgrav 		}
835b7579f77SDag-Erling Smørgrav 		/* ignore subq - not need for more init */
836b7579f77SDag-Erling Smørgrav 	}
837b7579f77SDag-Erling Smørgrav }
838b7579f77SDag-Erling Smørgrav 
839b7579f77SDag-Erling Smørgrav /**
840b7579f77SDag-Erling Smørgrav  * Generate a NS check request to obtain authoritative information
841b7579f77SDag-Erling Smørgrav  * on an NS rrset.
842b7579f77SDag-Erling Smørgrav  *
843b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
844b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
845b7579f77SDag-Erling Smørgrav  * @param id: module id.
846b7579f77SDag-Erling Smørgrav  */
847b7579f77SDag-Erling Smørgrav static void
848b7579f77SDag-Erling Smørgrav generate_ns_check(struct module_qstate* qstate, struct iter_qstate* iq, int id)
849b7579f77SDag-Erling Smørgrav {
850b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
851b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
852b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
853b7579f77SDag-Erling Smørgrav 
854b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth)
855b7579f77SDag-Erling Smørgrav 		return;
856b7579f77SDag-Erling Smørgrav 	/* is this query the same as the nscheck? */
857b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_NS &&
858b7579f77SDag-Erling Smørgrav 		query_dname_compare(iq->dp->name, qstate->qinfo.qname)==0 &&
859b7579f77SDag-Erling Smørgrav 		(qstate->query_flags&BIT_RD) && !(qstate->query_flags&BIT_CD)){
860b7579f77SDag-Erling Smørgrav 		/* spawn off A, AAAA queries for in-zone glue to check */
861b7579f77SDag-Erling Smørgrav 		generate_a_aaaa_check(qstate, iq, id);
862b7579f77SDag-Erling Smørgrav 		return;
863b7579f77SDag-Erling Smørgrav 	}
864b7579f77SDag-Erling Smørgrav 
865b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_ALGO, "schedule ns fetch",
866b7579f77SDag-Erling Smørgrav 		iq->dp->name, LDNS_RR_TYPE_NS, iq->qchase.qclass);
867b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(iq->dp->name, iq->dp->namelen,
868b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, iq->qchase.qclass, qstate, id, iq,
869b7579f77SDag-Erling Smørgrav 		INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1)) {
870b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not generate ns check");
871b7579f77SDag-Erling Smørgrav 		return;
872b7579f77SDag-Erling Smørgrav 	}
873b7579f77SDag-Erling Smørgrav 	if(subq) {
874b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
875b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
876b7579f77SDag-Erling Smørgrav 
877b7579f77SDag-Erling Smørgrav 		/* make copy to avoid use of stub dp by different qs/threads */
878b7579f77SDag-Erling Smørgrav 		/* refetch glue to start higher up the tree */
879b7579f77SDag-Erling Smørgrav 		subiq->refetch_glue = 1;
880b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(iq->dp, subq->region);
881b7579f77SDag-Erling Smørgrav 		if(!subiq->dp) {
882b7579f77SDag-Erling Smørgrav 			log_err("out of memory generating ns check, copydp");
883b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
884b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
885b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
886b7579f77SDag-Erling Smørgrav 			return;
887b7579f77SDag-Erling Smørgrav 		}
888b7579f77SDag-Erling Smørgrav 	}
889b7579f77SDag-Erling Smørgrav }
890b7579f77SDag-Erling Smørgrav 
891b7579f77SDag-Erling Smørgrav /**
892b7579f77SDag-Erling Smørgrav  * Generate a DNSKEY prefetch query to get the DNSKEY for the DS record we
893b7579f77SDag-Erling Smørgrav  * just got in a referral (where we have dnssec_expected, thus have trust
894b7579f77SDag-Erling Smørgrav  * anchors above it).  Note that right after calling this routine the
895b7579f77SDag-Erling Smørgrav  * iterator detached subqueries (because of following the referral), and thus
896b7579f77SDag-Erling Smørgrav  * the DNSKEY query becomes detached, its return stored in the cache for
897b7579f77SDag-Erling Smørgrav  * later lookup by the validator.  This cache lookup by the validator avoids
898b7579f77SDag-Erling Smørgrav  * the roundtrip incurred by the DNSKEY query.  The DNSKEY query is now
899b7579f77SDag-Erling Smørgrav  * performed at about the same time the original query is sent to the domain,
900b7579f77SDag-Erling Smørgrav  * thus the two answers are likely to be returned at about the same time,
901b7579f77SDag-Erling Smørgrav  * saving a roundtrip from the validated lookup.
902b7579f77SDag-Erling Smørgrav  *
903b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
904b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
905b7579f77SDag-Erling Smørgrav  * @param id: module id.
906b7579f77SDag-Erling Smørgrav  */
907b7579f77SDag-Erling Smørgrav static void
908b7579f77SDag-Erling Smørgrav generate_dnskey_prefetch(struct module_qstate* qstate,
909b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq, int id)
910b7579f77SDag-Erling Smørgrav {
911b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
912b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
913b7579f77SDag-Erling Smørgrav 
914b7579f77SDag-Erling Smørgrav 	/* is this query the same as the prefetch? */
915b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_DNSKEY &&
916b7579f77SDag-Erling Smørgrav 		query_dname_compare(iq->dp->name, qstate->qinfo.qname)==0 &&
917b7579f77SDag-Erling Smørgrav 		(qstate->query_flags&BIT_RD) && !(qstate->query_flags&BIT_CD)){
918b7579f77SDag-Erling Smørgrav 		return;
919b7579f77SDag-Erling Smørgrav 	}
920b7579f77SDag-Erling Smørgrav 
921b7579f77SDag-Erling Smørgrav 	/* if the DNSKEY is in the cache this lookup will stop quickly */
922b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_ALGO, "schedule dnskey prefetch",
923b7579f77SDag-Erling Smørgrav 		iq->dp->name, LDNS_RR_TYPE_DNSKEY, iq->qchase.qclass);
924b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(iq->dp->name, iq->dp->namelen,
925b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_DNSKEY, iq->qchase.qclass, qstate, id, iq,
926b7579f77SDag-Erling Smørgrav 		INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0)) {
927b7579f77SDag-Erling Smørgrav 		/* we'll be slower, but it'll work */
928b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not generate dnskey prefetch");
929b7579f77SDag-Erling Smørgrav 		return;
930b7579f77SDag-Erling Smørgrav 	}
931b7579f77SDag-Erling Smørgrav 	if(subq) {
932b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
933b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
934b7579f77SDag-Erling Smørgrav 		/* this qstate has the right delegation for the dnskey lookup*/
935b7579f77SDag-Erling Smørgrav 		/* make copy to avoid use of stub dp by different qs/threads */
936b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(iq->dp, subq->region);
937b7579f77SDag-Erling Smørgrav 		/* if !subiq->dp, it'll start from the cache, no problem */
938b7579f77SDag-Erling Smørgrav 	}
939b7579f77SDag-Erling Smørgrav }
940b7579f77SDag-Erling Smørgrav 
941b7579f77SDag-Erling Smørgrav /**
942b7579f77SDag-Erling Smørgrav  * See if the query needs forwarding.
943b7579f77SDag-Erling Smørgrav  *
944b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
945b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
946b7579f77SDag-Erling Smørgrav  * @return true if the request is forwarded, false if not.
947b7579f77SDag-Erling Smørgrav  * 	If returns true but, iq->dp is NULL then a malloc failure occurred.
948b7579f77SDag-Erling Smørgrav  */
949b7579f77SDag-Erling Smørgrav static int
950b7579f77SDag-Erling Smørgrav forward_request(struct module_qstate* qstate, struct iter_qstate* iq)
951b7579f77SDag-Erling Smørgrav {
952b7579f77SDag-Erling Smørgrav 	struct delegpt* dp;
953b7579f77SDag-Erling Smørgrav 	uint8_t* delname = iq->qchase.qname;
954b7579f77SDag-Erling Smørgrav 	size_t delnamelen = iq->qchase.qname_len;
955b7579f77SDag-Erling Smørgrav 	if(iq->refetch_glue) {
956b7579f77SDag-Erling Smørgrav 		delname = iq->dp->name;
957b7579f77SDag-Erling Smørgrav 		delnamelen = iq->dp->namelen;
958b7579f77SDag-Erling Smørgrav 	}
959b7579f77SDag-Erling Smørgrav 	/* strip one label off of DS query to lookup higher for it */
960b7579f77SDag-Erling Smørgrav 	if( (iq->qchase.qtype == LDNS_RR_TYPE_DS || iq->refetch_glue)
961b7579f77SDag-Erling Smørgrav 		&& !dname_is_root(iq->qchase.qname))
962b7579f77SDag-Erling Smørgrav 		dname_remove_label(&delname, &delnamelen);
963b7579f77SDag-Erling Smørgrav 	dp = forwards_lookup(qstate->env->fwds, delname, iq->qchase.qclass);
964b7579f77SDag-Erling Smørgrav 	if(!dp)
965b7579f77SDag-Erling Smørgrav 		return 0;
966b7579f77SDag-Erling Smørgrav 	/* send recursion desired to forward addr */
967b7579f77SDag-Erling Smørgrav 	iq->chase_flags |= BIT_RD;
968b7579f77SDag-Erling Smørgrav 	iq->dp = delegpt_copy(dp, qstate->region);
969b7579f77SDag-Erling Smørgrav 	/* iq->dp checked by caller */
970b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "forwarding request");
971b7579f77SDag-Erling Smørgrav 	return 1;
972b7579f77SDag-Erling Smørgrav }
973b7579f77SDag-Erling Smørgrav 
974b7579f77SDag-Erling Smørgrav /**
975b7579f77SDag-Erling Smørgrav  * Process the initial part of the request handling. This state roughly
976b7579f77SDag-Erling Smørgrav  * corresponds to resolver algorithms steps 1 (find answer in cache) and 2
977b7579f77SDag-Erling Smørgrav  * (find the best servers to ask).
978b7579f77SDag-Erling Smørgrav  *
979b7579f77SDag-Erling Smørgrav  * Note that all requests start here, and query restarts revisit this state.
980b7579f77SDag-Erling Smørgrav  *
981b7579f77SDag-Erling Smørgrav  * This state either generates: 1) a response, from cache or error, 2) a
982b7579f77SDag-Erling Smørgrav  * priming event, or 3) forwards the request to the next state (init2,
983b7579f77SDag-Erling Smørgrav  * generally).
984b7579f77SDag-Erling Smørgrav  *
985b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
986b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
987b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
988b7579f77SDag-Erling Smørgrav  * @param id: module id.
989b7579f77SDag-Erling Smørgrav  * @return true if the event needs more request processing immediately,
990b7579f77SDag-Erling Smørgrav  *         false if not.
991b7579f77SDag-Erling Smørgrav  */
992b7579f77SDag-Erling Smørgrav static int
993b7579f77SDag-Erling Smørgrav processInitRequest(struct module_qstate* qstate, struct iter_qstate* iq,
994b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
995b7579f77SDag-Erling Smørgrav {
996b7579f77SDag-Erling Smørgrav 	uint8_t* delname;
997b7579f77SDag-Erling Smørgrav 	size_t delnamelen;
998bc892140SDag-Erling Smørgrav 	struct dns_msg* msg = NULL;
999b7579f77SDag-Erling Smørgrav 
1000b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_DETAIL, "resolving", &qstate->qinfo);
1001b7579f77SDag-Erling Smørgrav 	/* check effort */
1002b7579f77SDag-Erling Smørgrav 
1003b7579f77SDag-Erling Smørgrav 	/* We enforce a maximum number of query restarts. This is primarily a
1004b7579f77SDag-Erling Smørgrav 	 * cheap way to prevent CNAME loops. */
1005b7579f77SDag-Erling Smørgrav 	if(iq->query_restart_count > MAX_RESTART_COUNT) {
1006b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum number"
1007b7579f77SDag-Erling Smørgrav 			" of query restarts with %d", iq->query_restart_count);
1008b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1009b7579f77SDag-Erling Smørgrav 	}
1010b7579f77SDag-Erling Smørgrav 
1011b7579f77SDag-Erling Smørgrav 	/* We enforce a maximum recursion/dependency depth -- in general,
1012b7579f77SDag-Erling Smørgrav 	 * this is unnecessary for dependency loops (although it will
1013b7579f77SDag-Erling Smørgrav 	 * catch those), but it provides a sensible limit to the amount
1014b7579f77SDag-Erling Smørgrav 	 * of work required to answer a given query. */
1015b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "request has dependency depth of %d", iq->depth);
1016b7579f77SDag-Erling Smørgrav 	if(iq->depth > ie->max_dependency_depth) {
1017b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum "
1018b7579f77SDag-Erling Smørgrav 			"dependency depth with depth of %d", iq->depth);
1019b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1020b7579f77SDag-Erling Smørgrav 	}
1021b7579f77SDag-Erling Smørgrav 
1022b7579f77SDag-Erling Smørgrav 	/* If the request is qclass=ANY, setup to generate each class */
1023b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qclass == LDNS_RR_CLASS_ANY) {
1024b7579f77SDag-Erling Smørgrav 		iq->qchase.qclass = 0;
1025b7579f77SDag-Erling Smørgrav 		return next_state(iq, COLLECT_CLASS_STATE);
1026b7579f77SDag-Erling Smørgrav 	}
1027b7579f77SDag-Erling Smørgrav 
1028b7579f77SDag-Erling Smørgrav 	/* Resolver Algorithm Step 1 -- Look for the answer in local data. */
1029b7579f77SDag-Erling Smørgrav 
1030b7579f77SDag-Erling Smørgrav 	/* This either results in a query restart (CNAME cache response), a
1031b7579f77SDag-Erling Smørgrav 	 * terminating response (ANSWER), or a cache miss (null). */
1032b7579f77SDag-Erling Smørgrav 
1033b7579f77SDag-Erling Smørgrav 	if(qstate->blacklist) {
1034b7579f77SDag-Erling Smørgrav 		/* if cache, or anything else, was blacklisted then
1035b7579f77SDag-Erling Smørgrav 		 * getting older results from cache is a bad idea, no cache */
1036b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "cache blacklisted, going to the network");
1037b7579f77SDag-Erling Smørgrav 		msg = NULL;
1038bc892140SDag-Erling Smørgrav 	} else if(!qstate->no_cache_lookup) {
1039b7579f77SDag-Erling Smørgrav 		msg = dns_cache_lookup(qstate->env, iq->qchase.qname,
1040b7579f77SDag-Erling Smørgrav 			iq->qchase.qname_len, iq->qchase.qtype,
1041ff825849SDag-Erling Smørgrav 			iq->qchase.qclass, qstate->query_flags,
1042ff825849SDag-Erling Smørgrav 			qstate->region, qstate->env->scratch);
1043b7579f77SDag-Erling Smørgrav 		if(!msg && qstate->env->neg_cache) {
1044b7579f77SDag-Erling Smørgrav 			/* lookup in negative cache; may result in
1045b7579f77SDag-Erling Smørgrav 			 * NOERROR/NODATA or NXDOMAIN answers that need validation */
1046b7579f77SDag-Erling Smørgrav 			msg = val_neg_getmsg(qstate->env->neg_cache, &iq->qchase,
1047b7579f77SDag-Erling Smørgrav 				qstate->region, qstate->env->rrset_cache,
1048b7579f77SDag-Erling Smørgrav 				qstate->env->scratch_buffer,
1049b7579f77SDag-Erling Smørgrav 				*qstate->env->now, 1/*add SOA*/, NULL);
1050b7579f77SDag-Erling Smørgrav 		}
1051b7579f77SDag-Erling Smørgrav 		/* item taken from cache does not match our query name, thus
1052b7579f77SDag-Erling Smørgrav 		 * security needs to be re-examined later */
1053b7579f77SDag-Erling Smørgrav 		if(msg && query_dname_compare(qstate->qinfo.qname,
1054b7579f77SDag-Erling Smørgrav 			iq->qchase.qname) != 0)
1055b7579f77SDag-Erling Smørgrav 			msg->rep->security = sec_status_unchecked;
1056b7579f77SDag-Erling Smørgrav 	}
1057b7579f77SDag-Erling Smørgrav 	if(msg) {
1058b7579f77SDag-Erling Smørgrav 		/* handle positive cache response */
1059b7579f77SDag-Erling Smørgrav 		enum response_type type = response_type_from_cache(msg,
1060b7579f77SDag-Erling Smørgrav 			&iq->qchase);
1061b7579f77SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO) {
1062b7579f77SDag-Erling Smørgrav 			log_dns_msg("msg from cache lookup", &msg->qinfo,
1063b7579f77SDag-Erling Smørgrav 				msg->rep);
1064b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "msg ttl is %d, prefetch ttl %d",
1065b7579f77SDag-Erling Smørgrav 				(int)msg->rep->ttl,
1066b7579f77SDag-Erling Smørgrav 				(int)msg->rep->prefetch_ttl);
1067b7579f77SDag-Erling Smørgrav 		}
1068b7579f77SDag-Erling Smørgrav 
1069b7579f77SDag-Erling Smørgrav 		if(type == RESPONSE_TYPE_CNAME) {
1070b7579f77SDag-Erling Smørgrav 			uint8_t* sname = 0;
1071b7579f77SDag-Erling Smørgrav 			size_t slen = 0;
1072b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "returning CNAME response from "
1073b7579f77SDag-Erling Smørgrav 				"cache");
1074b7579f77SDag-Erling Smørgrav 			if(!handle_cname_response(qstate, iq, msg,
1075b7579f77SDag-Erling Smørgrav 				&sname, &slen))
1076b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1077b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
1078b7579f77SDag-Erling Smørgrav 			iq->qchase.qname = sname;
1079b7579f77SDag-Erling Smørgrav 			iq->qchase.qname_len = slen;
1080b7579f77SDag-Erling Smørgrav 			/* This *is* a query restart, even if it is a cheap
1081b7579f77SDag-Erling Smørgrav 			 * one. */
1082b7579f77SDag-Erling Smørgrav 			iq->dp = NULL;
1083b7579f77SDag-Erling Smørgrav 			iq->refetch_glue = 0;
1084b7579f77SDag-Erling Smørgrav 			iq->query_restart_count++;
1085b7579f77SDag-Erling Smørgrav 			iq->sent_count = 0;
1086b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin, NULL, 0, qstate->region);
108705ab2901SDag-Erling Smørgrav 			if(qstate->env->cfg->qname_minimisation)
108805ab2901SDag-Erling Smørgrav 				iq->minimisation_state = INIT_MINIMISE_STATE;
1089b7579f77SDag-Erling Smørgrav 			return next_state(iq, INIT_REQUEST_STATE);
1090b7579f77SDag-Erling Smørgrav 		}
1091b7579f77SDag-Erling Smørgrav 
1092b7579f77SDag-Erling Smørgrav 		/* if from cache, NULL, else insert 'cache IP' len=0 */
1093b7579f77SDag-Erling Smørgrav 		if(qstate->reply_origin)
1094b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin, NULL, 0, qstate->region);
1095b7579f77SDag-Erling Smørgrav 		/* it is an answer, response, to final state */
1096b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "returning answer from cache.");
1097b7579f77SDag-Erling Smørgrav 		iq->response = msg;
1098b7579f77SDag-Erling Smørgrav 		return final_state(iq);
1099b7579f77SDag-Erling Smørgrav 	}
1100b7579f77SDag-Erling Smørgrav 
1101b7579f77SDag-Erling Smørgrav 	/* attempt to forward the request */
1102b7579f77SDag-Erling Smørgrav 	if(forward_request(qstate, iq))
1103b7579f77SDag-Erling Smørgrav 	{
1104b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
1105b7579f77SDag-Erling Smørgrav 			log_err("alloc failure for forward dp");
1106b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1107b7579f77SDag-Erling Smørgrav 		}
1108b7579f77SDag-Erling Smørgrav 		iq->refetch_glue = 0;
110905ab2901SDag-Erling Smørgrav 		iq->minimisation_state = DONOT_MINIMISE_STATE;
1110b7579f77SDag-Erling Smørgrav 		/* the request has been forwarded.
1111b7579f77SDag-Erling Smørgrav 		 * forwarded requests need to be immediately sent to the
1112b7579f77SDag-Erling Smørgrav 		 * next state, QUERYTARGETS. */
1113b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
1114b7579f77SDag-Erling Smørgrav 	}
1115b7579f77SDag-Erling Smørgrav 
1116b7579f77SDag-Erling Smørgrav 	/* Resolver Algorithm Step 2 -- find the "best" servers. */
1117b7579f77SDag-Erling Smørgrav 
1118b7579f77SDag-Erling Smørgrav 	/* first, adjust for DS queries. To avoid the grandparent problem,
1119b7579f77SDag-Erling Smørgrav 	 * we just look for the closest set of server to the parent of qname.
1120b7579f77SDag-Erling Smørgrav 	 * When re-fetching glue we also need to ask the parent.
1121b7579f77SDag-Erling Smørgrav 	 */
1122b7579f77SDag-Erling Smørgrav 	if(iq->refetch_glue) {
1123b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
1124b7579f77SDag-Erling Smørgrav 			log_err("internal or malloc fail: no dp for refetch");
1125b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1126b7579f77SDag-Erling Smørgrav 		}
1127b7579f77SDag-Erling Smørgrav 		delname = iq->dp->name;
1128b7579f77SDag-Erling Smørgrav 		delnamelen = iq->dp->namelen;
1129b7579f77SDag-Erling Smørgrav 	} else {
1130b7579f77SDag-Erling Smørgrav 		delname = iq->qchase.qname;
1131b7579f77SDag-Erling Smørgrav 		delnamelen = iq->qchase.qname_len;
1132b7579f77SDag-Erling Smørgrav 	}
1133b7579f77SDag-Erling Smørgrav 	if(iq->qchase.qtype == LDNS_RR_TYPE_DS || iq->refetch_glue ||
1134b7579f77SDag-Erling Smørgrav 	   (iq->qchase.qtype == LDNS_RR_TYPE_NS && qstate->prefetch_leeway)) {
1135b7579f77SDag-Erling Smørgrav 		/* remove first label from delname, root goes to hints,
1136b7579f77SDag-Erling Smørgrav 		 * but only to fetch glue, not for qtype=DS. */
1137b7579f77SDag-Erling Smørgrav 		/* also when prefetching an NS record, fetch it again from
1138b7579f77SDag-Erling Smørgrav 		 * its parent, just as if it expired, so that you do not
1139b7579f77SDag-Erling Smørgrav 		 * get stuck on an older nameserver that gives old NSrecords */
1140b7579f77SDag-Erling Smørgrav 		if(dname_is_root(delname) && (iq->refetch_glue ||
1141b7579f77SDag-Erling Smørgrav 			(iq->qchase.qtype == LDNS_RR_TYPE_NS &&
1142b7579f77SDag-Erling Smørgrav 			qstate->prefetch_leeway)))
1143b7579f77SDag-Erling Smørgrav 			delname = NULL; /* go to root priming */
1144b7579f77SDag-Erling Smørgrav 		else 	dname_remove_label(&delname, &delnamelen);
1145b7579f77SDag-Erling Smørgrav 	}
1146b7579f77SDag-Erling Smørgrav 	/* delname is the name to lookup a delegation for. If NULL rootprime */
1147b7579f77SDag-Erling Smørgrav 	while(1) {
1148b7579f77SDag-Erling Smørgrav 
1149b7579f77SDag-Erling Smørgrav 		/* Lookup the delegation in the cache. If null, then the
1150b7579f77SDag-Erling Smørgrav 		 * cache needs to be primed for the qclass. */
1151b7579f77SDag-Erling Smørgrav 		if(delname)
1152b7579f77SDag-Erling Smørgrav 		     iq->dp = dns_cache_find_delegation(qstate->env, delname,
1153b7579f77SDag-Erling Smørgrav 			delnamelen, iq->qchase.qtype, iq->qchase.qclass,
1154b7579f77SDag-Erling Smørgrav 			qstate->region, &iq->deleg_msg,
1155b7579f77SDag-Erling Smørgrav 			*qstate->env->now+qstate->prefetch_leeway);
1156b7579f77SDag-Erling Smørgrav 		else iq->dp = NULL;
1157b7579f77SDag-Erling Smørgrav 
1158b7579f77SDag-Erling Smørgrav 		/* If the cache has returned nothing, then we have a
1159b7579f77SDag-Erling Smørgrav 		 * root priming situation. */
1160b7579f77SDag-Erling Smørgrav 		if(iq->dp == NULL) {
1161b7579f77SDag-Erling Smørgrav 			/* if there is a stub, then no root prime needed */
1162b7579f77SDag-Erling Smørgrav 			int r = prime_stub(qstate, iq, id, delname,
1163b7579f77SDag-Erling Smørgrav 				iq->qchase.qclass);
1164b7579f77SDag-Erling Smørgrav 			if(r == 2)
1165b7579f77SDag-Erling Smørgrav 				break; /* got noprime-stub-zone, continue */
1166b7579f77SDag-Erling Smørgrav 			else if(r)
1167b7579f77SDag-Erling Smørgrav 				return 0; /* stub prime request made */
1168b7579f77SDag-Erling Smørgrav 			if(forwards_lookup_root(qstate->env->fwds,
1169b7579f77SDag-Erling Smørgrav 				iq->qchase.qclass)) {
1170b7579f77SDag-Erling Smørgrav 				/* forward zone root, no root prime needed */
1171b7579f77SDag-Erling Smørgrav 				/* fill in some dp - safety belt */
1172b7579f77SDag-Erling Smørgrav 				iq->dp = hints_lookup_root(qstate->env->hints,
1173b7579f77SDag-Erling Smørgrav 					iq->qchase.qclass);
1174b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1175b7579f77SDag-Erling Smørgrav 					log_err("internal error: no hints dp");
1176b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1177b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1178b7579f77SDag-Erling Smørgrav 				}
1179b7579f77SDag-Erling Smørgrav 				iq->dp = delegpt_copy(iq->dp, qstate->region);
1180b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1181b7579f77SDag-Erling Smørgrav 					log_err("out of memory in safety belt");
1182b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1183b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1184b7579f77SDag-Erling Smørgrav 				}
1185b7579f77SDag-Erling Smørgrav 				return next_state(iq, INIT_REQUEST_2_STATE);
1186b7579f77SDag-Erling Smørgrav 			}
1187b7579f77SDag-Erling Smørgrav 			/* Note that the result of this will set a new
1188b7579f77SDag-Erling Smørgrav 			 * DelegationPoint based on the result of priming. */
1189b7579f77SDag-Erling Smørgrav 			if(!prime_root(qstate, iq, id, iq->qchase.qclass))
1190b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1191b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_REFUSED);
1192b7579f77SDag-Erling Smørgrav 
1193b7579f77SDag-Erling Smørgrav 			/* priming creates and sends a subordinate query, with
1194b7579f77SDag-Erling Smørgrav 			 * this query as the parent. So further processing for
1195b7579f77SDag-Erling Smørgrav 			 * this event will stop until reactivated by the
1196b7579f77SDag-Erling Smørgrav 			 * results of priming. */
1197b7579f77SDag-Erling Smørgrav 			return 0;
1198b7579f77SDag-Erling Smørgrav 		}
119909a3aaf3SDag-Erling Smørgrav 		if(!iq->ratelimit_ok && qstate->prefetch_leeway)
120009a3aaf3SDag-Erling Smørgrav 			iq->ratelimit_ok = 1; /* allow prefetches, this keeps
120109a3aaf3SDag-Erling Smørgrav 			otherwise valid data in the cache */
120209a3aaf3SDag-Erling Smørgrav 		if(!iq->ratelimit_ok && infra_ratelimit_exceeded(
120309a3aaf3SDag-Erling Smørgrav 			qstate->env->infra_cache, iq->dp->name,
120409a3aaf3SDag-Erling Smørgrav 			iq->dp->namelen, *qstate->env->now)) {
120509a3aaf3SDag-Erling Smørgrav 			/* and increment the rate, so that the rate for time
120609a3aaf3SDag-Erling Smørgrav 			 * now will also exceed the rate, keeping cache fresh */
120709a3aaf3SDag-Erling Smørgrav 			(void)infra_ratelimit_inc(qstate->env->infra_cache,
120809a3aaf3SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
120909a3aaf3SDag-Erling Smørgrav 				*qstate->env->now);
121009a3aaf3SDag-Erling Smørgrav 			/* see if we are passed through with slip factor */
121109a3aaf3SDag-Erling Smørgrav 			if(qstate->env->cfg->ratelimit_factor != 0 &&
121209a3aaf3SDag-Erling Smørgrav 				ub_random_max(qstate->env->rnd,
121309a3aaf3SDag-Erling Smørgrav 				    qstate->env->cfg->ratelimit_factor) == 1) {
121409a3aaf3SDag-Erling Smørgrav 				iq->ratelimit_ok = 1;
121509a3aaf3SDag-Erling Smørgrav 				log_nametypeclass(VERB_ALGO, "ratelimit allowed through for "
121609a3aaf3SDag-Erling Smørgrav 					"delegation point", iq->dp->name,
121709a3aaf3SDag-Erling Smørgrav 					LDNS_RR_TYPE_NS, LDNS_RR_CLASS_IN);
121809a3aaf3SDag-Erling Smørgrav 			} else {
121909a3aaf3SDag-Erling Smørgrav 				log_nametypeclass(VERB_ALGO, "ratelimit exceeded with "
122009a3aaf3SDag-Erling Smørgrav 					"delegation point", iq->dp->name,
122109a3aaf3SDag-Erling Smørgrav 					LDNS_RR_TYPE_NS, LDNS_RR_CLASS_IN);
122209a3aaf3SDag-Erling Smørgrav 				return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
122309a3aaf3SDag-Erling Smørgrav 			}
122409a3aaf3SDag-Erling Smørgrav 		}
1225b7579f77SDag-Erling Smørgrav 
1226b7579f77SDag-Erling Smørgrav 		/* see if this dp not useless.
1227b7579f77SDag-Erling Smørgrav 		 * It is useless if:
1228b7579f77SDag-Erling Smørgrav 		 *	o all NS items are required glue.
1229b7579f77SDag-Erling Smørgrav 		 *	  or the query is for NS item that is required glue.
1230b7579f77SDag-Erling Smørgrav 		 *	o no addresses are provided.
1231b7579f77SDag-Erling Smørgrav 		 *	o RD qflag is on.
1232b7579f77SDag-Erling Smørgrav 		 * Instead, go up one level, and try to get even further
1233b7579f77SDag-Erling Smørgrav 		 * If the root was useless, use safety belt information.
1234b7579f77SDag-Erling Smørgrav 		 * Only check cache returns, because replies for servers
1235b7579f77SDag-Erling Smørgrav 		 * could be useless but lead to loops (bumping into the
1236b7579f77SDag-Erling Smørgrav 		 * same server reply) if useless-checked.
1237b7579f77SDag-Erling Smørgrav 		 */
1238b7579f77SDag-Erling Smørgrav 		if(iter_dp_is_useless(&qstate->qinfo, qstate->query_flags,
1239b7579f77SDag-Erling Smørgrav 			iq->dp)) {
1240b7579f77SDag-Erling Smørgrav 			if(dname_is_root(iq->dp->name)) {
1241b7579f77SDag-Erling Smørgrav 				/* use safety belt */
1242b7579f77SDag-Erling Smørgrav 				verbose(VERB_QUERY, "Cache has root NS but "
1243b7579f77SDag-Erling Smørgrav 				"no addresses. Fallback to the safety belt.");
1244b7579f77SDag-Erling Smørgrav 				iq->dp = hints_lookup_root(qstate->env->hints,
1245b7579f77SDag-Erling Smørgrav 					iq->qchase.qclass);
1246b7579f77SDag-Erling Smørgrav 				/* note deleg_msg is from previous lookup,
1247b7579f77SDag-Erling Smørgrav 				 * but RD is on, so it is not used */
1248b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1249b7579f77SDag-Erling Smørgrav 					log_err("internal error: no hints dp");
1250b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1251b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_REFUSED);
1252b7579f77SDag-Erling Smørgrav 				}
1253b7579f77SDag-Erling Smørgrav 				iq->dp = delegpt_copy(iq->dp, qstate->region);
1254b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1255b7579f77SDag-Erling Smørgrav 					log_err("out of memory in safety belt");
1256b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1257b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1258b7579f77SDag-Erling Smørgrav 				}
1259b7579f77SDag-Erling Smørgrav 				break;
1260b7579f77SDag-Erling Smørgrav 			} else {
1261b7579f77SDag-Erling Smørgrav 				verbose(VERB_ALGO,
1262b7579f77SDag-Erling Smørgrav 					"cache delegation was useless:");
1263b7579f77SDag-Erling Smørgrav 				delegpt_log(VERB_ALGO, iq->dp);
1264b7579f77SDag-Erling Smørgrav 				/* go up */
1265b7579f77SDag-Erling Smørgrav 				delname = iq->dp->name;
1266b7579f77SDag-Erling Smørgrav 				delnamelen = iq->dp->namelen;
1267b7579f77SDag-Erling Smørgrav 				dname_remove_label(&delname, &delnamelen);
1268b7579f77SDag-Erling Smørgrav 			}
1269b7579f77SDag-Erling Smørgrav 		} else break;
1270b7579f77SDag-Erling Smørgrav 	}
1271b7579f77SDag-Erling Smørgrav 
1272b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "cache delegation returns delegpt");
1273b7579f77SDag-Erling Smørgrav 	delegpt_log(VERB_ALGO, iq->dp);
1274b7579f77SDag-Erling Smørgrav 
1275b7579f77SDag-Erling Smørgrav 	/* Otherwise, set the current delegation point and move on to the
1276b7579f77SDag-Erling Smørgrav 	 * next state. */
1277b7579f77SDag-Erling Smørgrav 	return next_state(iq, INIT_REQUEST_2_STATE);
1278b7579f77SDag-Erling Smørgrav }
1279b7579f77SDag-Erling Smørgrav 
1280b7579f77SDag-Erling Smørgrav /**
1281b7579f77SDag-Erling Smørgrav  * Process the second part of the initial request handling. This state
1282b7579f77SDag-Erling Smørgrav  * basically exists so that queries that generate root priming events have
1283b7579f77SDag-Erling Smørgrav  * the same init processing as ones that do not. Request events that reach
1284b7579f77SDag-Erling Smørgrav  * this state must have a valid currentDelegationPoint set.
1285b7579f77SDag-Erling Smørgrav  *
1286b7579f77SDag-Erling Smørgrav  * This part is primarly handling stub zone priming. Events that reach this
1287b7579f77SDag-Erling Smørgrav  * state must have a current delegation point.
1288b7579f77SDag-Erling Smørgrav  *
1289b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1290b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1291b7579f77SDag-Erling Smørgrav  * @param id: module id.
1292b7579f77SDag-Erling Smørgrav  * @return true if the event needs more request processing immediately,
1293b7579f77SDag-Erling Smørgrav  *         false if not.
1294b7579f77SDag-Erling Smørgrav  */
1295b7579f77SDag-Erling Smørgrav static int
1296b7579f77SDag-Erling Smørgrav processInitRequest2(struct module_qstate* qstate, struct iter_qstate* iq,
1297b7579f77SDag-Erling Smørgrav 	int id)
1298b7579f77SDag-Erling Smørgrav {
1299b7579f77SDag-Erling Smørgrav 	uint8_t* delname;
1300b7579f77SDag-Erling Smørgrav 	size_t delnamelen;
1301b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "resolving (init part 2): ",
1302b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
1303b7579f77SDag-Erling Smørgrav 
1304b7579f77SDag-Erling Smørgrav 	if(iq->refetch_glue) {
1305b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
1306b7579f77SDag-Erling Smørgrav 			log_err("internal or malloc fail: no dp for refetch");
1307b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1308b7579f77SDag-Erling Smørgrav 		}
1309b7579f77SDag-Erling Smørgrav 		delname = iq->dp->name;
1310b7579f77SDag-Erling Smørgrav 		delnamelen = iq->dp->namelen;
1311b7579f77SDag-Erling Smørgrav 	} else {
1312b7579f77SDag-Erling Smørgrav 		delname = iq->qchase.qname;
1313b7579f77SDag-Erling Smørgrav 		delnamelen = iq->qchase.qname_len;
1314b7579f77SDag-Erling Smørgrav 	}
1315b7579f77SDag-Erling Smørgrav 	if(iq->qchase.qtype == LDNS_RR_TYPE_DS || iq->refetch_glue) {
1316b7579f77SDag-Erling Smørgrav 		if(!dname_is_root(delname))
1317b7579f77SDag-Erling Smørgrav 			dname_remove_label(&delname, &delnamelen);
1318b7579f77SDag-Erling Smørgrav 		iq->refetch_glue = 0; /* if CNAME causes restart, no refetch */
1319b7579f77SDag-Erling Smørgrav 	}
1320b7579f77SDag-Erling Smørgrav 	/* Check to see if we need to prime a stub zone. */
1321b7579f77SDag-Erling Smørgrav 	if(prime_stub(qstate, iq, id, delname, iq->qchase.qclass)) {
1322b7579f77SDag-Erling Smørgrav 		/* A priming sub request was made */
1323b7579f77SDag-Erling Smørgrav 		return 0;
1324b7579f77SDag-Erling Smørgrav 	}
1325b7579f77SDag-Erling Smørgrav 
1326b7579f77SDag-Erling Smørgrav 	/* most events just get forwarded to the next state. */
1327b7579f77SDag-Erling Smørgrav 	return next_state(iq, INIT_REQUEST_3_STATE);
1328b7579f77SDag-Erling Smørgrav }
1329b7579f77SDag-Erling Smørgrav 
1330b7579f77SDag-Erling Smørgrav /**
1331b7579f77SDag-Erling Smørgrav  * Process the third part of the initial request handling. This state exists
1332b7579f77SDag-Erling Smørgrav  * as a separate state so that queries that generate stub priming events
1333b7579f77SDag-Erling Smørgrav  * will get the tail end of the init process but not repeat the stub priming
1334b7579f77SDag-Erling Smørgrav  * check.
1335b7579f77SDag-Erling Smørgrav  *
1336b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1337b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1338b7579f77SDag-Erling Smørgrav  * @param id: module id.
1339b7579f77SDag-Erling Smørgrav  * @return true, advancing the event to the QUERYTARGETS_STATE.
1340b7579f77SDag-Erling Smørgrav  */
1341b7579f77SDag-Erling Smørgrav static int
1342b7579f77SDag-Erling Smørgrav processInitRequest3(struct module_qstate* qstate, struct iter_qstate* iq,
1343b7579f77SDag-Erling Smørgrav 	int id)
1344b7579f77SDag-Erling Smørgrav {
1345b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "resolving (init part 3): ",
1346b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
1347b7579f77SDag-Erling Smørgrav 	/* if the cache reply dp equals a validation anchor or msg has DS,
1348b7579f77SDag-Erling Smørgrav 	 * then DNSSEC RRSIGs are expected in the reply */
1349b7579f77SDag-Erling Smørgrav 	iq->dnssec_expected = iter_indicates_dnssec(qstate->env, iq->dp,
1350b7579f77SDag-Erling Smørgrav 		iq->deleg_msg, iq->qchase.qclass);
1351b7579f77SDag-Erling Smørgrav 
1352b7579f77SDag-Erling Smørgrav 	/* If the RD flag wasn't set, then we just finish with the
1353b7579f77SDag-Erling Smørgrav 	 * cached referral as the response. */
1354*65b390aaSDag-Erling Smørgrav 	if(!(qstate->query_flags & BIT_RD) && iq->deleg_msg) {
1355b7579f77SDag-Erling Smørgrav 		iq->response = iq->deleg_msg;
135617d15b25SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO && iq->response)
1357b7579f77SDag-Erling Smørgrav 			log_dns_msg("no RD requested, using delegation msg",
1358b7579f77SDag-Erling Smørgrav 				&iq->response->qinfo, iq->response->rep);
1359b7579f77SDag-Erling Smørgrav 		if(qstate->reply_origin)
1360b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin, NULL, 0, qstate->region);
1361b7579f77SDag-Erling Smørgrav 		return final_state(iq);
1362b7579f77SDag-Erling Smørgrav 	}
1363b7579f77SDag-Erling Smørgrav 	/* After this point, unset the RD flag -- this query is going to
1364b7579f77SDag-Erling Smørgrav 	 * be sent to an auth. server. */
1365b7579f77SDag-Erling Smørgrav 	iq->chase_flags &= ~BIT_RD;
1366b7579f77SDag-Erling Smørgrav 
1367b7579f77SDag-Erling Smørgrav 	/* if dnssec expected, fetch key for the trust-anchor or cached-DS */
1368b7579f77SDag-Erling Smørgrav 	if(iq->dnssec_expected && qstate->env->cfg->prefetch_key &&
1369b7579f77SDag-Erling Smørgrav 		!(qstate->query_flags&BIT_CD)) {
1370b7579f77SDag-Erling Smørgrav 		generate_dnskey_prefetch(qstate, iq, id);
1371b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
1372b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
1373b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
1374b7579f77SDag-Erling Smørgrav 	}
1375b7579f77SDag-Erling Smørgrav 
1376b7579f77SDag-Erling Smørgrav 	/* Jump to the next state. */
1377b7579f77SDag-Erling Smørgrav 	return next_state(iq, QUERYTARGETS_STATE);
1378b7579f77SDag-Erling Smørgrav }
1379b7579f77SDag-Erling Smørgrav 
1380b7579f77SDag-Erling Smørgrav /**
1381b7579f77SDag-Erling Smørgrav  * Given a basic query, generate a parent-side "target" query.
1382b7579f77SDag-Erling Smørgrav  * These are subordinate queries for missing delegation point target addresses,
1383b7579f77SDag-Erling Smørgrav  * for which only the parent of the delegation provides correct IP addresses.
1384b7579f77SDag-Erling Smørgrav  *
1385b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1386b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1387b7579f77SDag-Erling Smørgrav  * @param id: module id.
1388b7579f77SDag-Erling Smørgrav  * @param name: target qname.
1389b7579f77SDag-Erling Smørgrav  * @param namelen: target qname length.
1390b7579f77SDag-Erling Smørgrav  * @param qtype: target qtype (either A or AAAA).
1391b7579f77SDag-Erling Smørgrav  * @param qclass: target qclass.
1392b7579f77SDag-Erling Smørgrav  * @return true on success, false on failure.
1393b7579f77SDag-Erling Smørgrav  */
1394b7579f77SDag-Erling Smørgrav static int
1395b7579f77SDag-Erling Smørgrav generate_parentside_target_query(struct module_qstate* qstate,
1396b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq, int id, uint8_t* name, size_t namelen,
1397b7579f77SDag-Erling Smørgrav 	uint16_t qtype, uint16_t qclass)
1398b7579f77SDag-Erling Smørgrav {
1399b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1400b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(name, namelen, qtype, qclass, qstate,
1401b7579f77SDag-Erling Smørgrav 		id, iq, INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0))
1402b7579f77SDag-Erling Smørgrav 		return 0;
1403b7579f77SDag-Erling Smørgrav 	if(subq) {
1404b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
1405b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
1406b7579f77SDag-Erling Smørgrav 		/* blacklist the cache - we want to fetch parent stuff */
1407b7579f77SDag-Erling Smørgrav 		sock_list_insert(&subq->blacklist, NULL, 0, subq->region);
1408b7579f77SDag-Erling Smørgrav 		subiq->query_for_pside_glue = 1;
1409b7579f77SDag-Erling Smørgrav 		if(dname_subdomain_c(name, iq->dp->name)) {
1410b7579f77SDag-Erling Smørgrav 			subiq->dp = delegpt_copy(iq->dp, subq->region);
1411b7579f77SDag-Erling Smørgrav 			subiq->dnssec_expected = iter_indicates_dnssec(
1412b7579f77SDag-Erling Smørgrav 				qstate->env, subiq->dp, NULL,
1413b7579f77SDag-Erling Smørgrav 				subq->qinfo.qclass);
1414b7579f77SDag-Erling Smørgrav 			subiq->refetch_glue = 1;
1415b7579f77SDag-Erling Smørgrav 		} else {
1416b7579f77SDag-Erling Smørgrav 			subiq->dp = dns_cache_find_delegation(qstate->env,
1417b7579f77SDag-Erling Smørgrav 				name, namelen, qtype, qclass, subq->region,
1418b7579f77SDag-Erling Smørgrav 				&subiq->deleg_msg,
1419b7579f77SDag-Erling Smørgrav 				*qstate->env->now+subq->prefetch_leeway);
1420b7579f77SDag-Erling Smørgrav 			/* if no dp, then it's from root, refetch unneeded */
1421b7579f77SDag-Erling Smørgrav 			if(subiq->dp) {
1422b7579f77SDag-Erling Smørgrav 				subiq->dnssec_expected = iter_indicates_dnssec(
1423b7579f77SDag-Erling Smørgrav 					qstate->env, subiq->dp, NULL,
1424b7579f77SDag-Erling Smørgrav 					subq->qinfo.qclass);
1425b7579f77SDag-Erling Smørgrav 				subiq->refetch_glue = 1;
1426b7579f77SDag-Erling Smørgrav 			}
1427b7579f77SDag-Erling Smørgrav 		}
1428b7579f77SDag-Erling Smørgrav 	}
1429b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_QUERY, "new pside target", name, qtype, qclass);
1430b7579f77SDag-Erling Smørgrav 	return 1;
1431b7579f77SDag-Erling Smørgrav }
1432b7579f77SDag-Erling Smørgrav 
1433b7579f77SDag-Erling Smørgrav /**
1434b7579f77SDag-Erling Smørgrav  * Given a basic query, generate a "target" query. These are subordinate
1435b7579f77SDag-Erling Smørgrav  * queries for missing delegation point target addresses.
1436b7579f77SDag-Erling Smørgrav  *
1437b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1438b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1439b7579f77SDag-Erling Smørgrav  * @param id: module id.
1440b7579f77SDag-Erling Smørgrav  * @param name: target qname.
1441b7579f77SDag-Erling Smørgrav  * @param namelen: target qname length.
1442b7579f77SDag-Erling Smørgrav  * @param qtype: target qtype (either A or AAAA).
1443b7579f77SDag-Erling Smørgrav  * @param qclass: target qclass.
1444b7579f77SDag-Erling Smørgrav  * @return true on success, false on failure.
1445b7579f77SDag-Erling Smørgrav  */
1446b7579f77SDag-Erling Smørgrav static int
1447b7579f77SDag-Erling Smørgrav generate_target_query(struct module_qstate* qstate, struct iter_qstate* iq,
1448b7579f77SDag-Erling Smørgrav         int id, uint8_t* name, size_t namelen, uint16_t qtype, uint16_t qclass)
1449b7579f77SDag-Erling Smørgrav {
1450b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1451b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(name, namelen, qtype, qclass, qstate,
1452b7579f77SDag-Erling Smørgrav 		id, iq, INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0))
1453b7579f77SDag-Erling Smørgrav 		return 0;
1454b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_QUERY, "new target", name, qtype, qclass);
1455b7579f77SDag-Erling Smørgrav 	return 1;
1456b7579f77SDag-Erling Smørgrav }
1457b7579f77SDag-Erling Smørgrav 
1458b7579f77SDag-Erling Smørgrav /**
1459b7579f77SDag-Erling Smørgrav  * Given an event at a certain state, generate zero or more target queries
1460b7579f77SDag-Erling Smørgrav  * for it's current delegation point.
1461b7579f77SDag-Erling Smørgrav  *
1462b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1463b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1464b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
1465b7579f77SDag-Erling Smørgrav  * @param id: module id.
1466b7579f77SDag-Erling Smørgrav  * @param maxtargets: The maximum number of targets to query for.
1467b7579f77SDag-Erling Smørgrav  *	if it is negative, there is no maximum number of targets.
1468b7579f77SDag-Erling Smørgrav  * @param num: returns the number of queries generated and processed,
1469b7579f77SDag-Erling Smørgrav  *	which may be zero if there were no missing targets.
1470b7579f77SDag-Erling Smørgrav  * @return false on error.
1471b7579f77SDag-Erling Smørgrav  */
1472b7579f77SDag-Erling Smørgrav static int
1473b7579f77SDag-Erling Smørgrav query_for_targets(struct module_qstate* qstate, struct iter_qstate* iq,
1474b7579f77SDag-Erling Smørgrav         struct iter_env* ie, int id, int maxtargets, int* num)
1475b7579f77SDag-Erling Smørgrav {
1476b7579f77SDag-Erling Smørgrav 	int query_count = 0;
1477b7579f77SDag-Erling Smørgrav 	struct delegpt_ns* ns;
1478b7579f77SDag-Erling Smørgrav 	int missing;
1479b7579f77SDag-Erling Smørgrav 	int toget = 0;
1480b7579f77SDag-Erling Smørgrav 
1481b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth)
1482b7579f77SDag-Erling Smørgrav 		return 0;
148352df462fSXin LI 	if(iq->depth > 0 && iq->target_count &&
148452df462fSXin LI 		iq->target_count[1] > MAX_TARGET_COUNT) {
14856480faa8SDag-Erling Smørgrav 		char s[LDNS_MAX_DOMAINLEN+1];
14866480faa8SDag-Erling Smørgrav 		dname_str(qstate->qinfo.qname, s);
14876480faa8SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request %s has exceeded the maximum "
14886480faa8SDag-Erling Smørgrav 			"number of glue fetches %d", s, iq->target_count[1]);
148952df462fSXin LI 		return 0;
149052df462fSXin LI 	}
1491b7579f77SDag-Erling Smørgrav 
1492b7579f77SDag-Erling Smørgrav 	iter_mark_cycle_targets(qstate, iq->dp);
1493b7579f77SDag-Erling Smørgrav 	missing = (int)delegpt_count_missing_targets(iq->dp);
1494b7579f77SDag-Erling Smørgrav 	log_assert(maxtargets != 0); /* that would not be useful */
1495b7579f77SDag-Erling Smørgrav 
1496b7579f77SDag-Erling Smørgrav 	/* Generate target requests. Basically, any missing targets
1497b7579f77SDag-Erling Smørgrav 	 * are queried for here, regardless if it is necessary to do
1498b7579f77SDag-Erling Smørgrav 	 * so to continue processing. */
1499b7579f77SDag-Erling Smørgrav 	if(maxtargets < 0 || maxtargets > missing)
1500b7579f77SDag-Erling Smørgrav 		toget = missing;
1501b7579f77SDag-Erling Smørgrav 	else	toget = maxtargets;
1502b7579f77SDag-Erling Smørgrav 	if(toget == 0) {
1503b7579f77SDag-Erling Smørgrav 		*num = 0;
1504b7579f77SDag-Erling Smørgrav 		return 1;
1505b7579f77SDag-Erling Smørgrav 	}
1506b7579f77SDag-Erling Smørgrav 	/* select 'toget' items from the total of 'missing' items */
1507b7579f77SDag-Erling Smørgrav 	log_assert(toget <= missing);
1508b7579f77SDag-Erling Smørgrav 
1509b7579f77SDag-Erling Smørgrav 	/* loop over missing targets */
1510b7579f77SDag-Erling Smørgrav 	for(ns = iq->dp->nslist; ns; ns = ns->next) {
1511b7579f77SDag-Erling Smørgrav 		if(ns->resolved)
1512b7579f77SDag-Erling Smørgrav 			continue;
1513b7579f77SDag-Erling Smørgrav 
1514b7579f77SDag-Erling Smørgrav 		/* randomly select this item with probability toget/missing */
1515b7579f77SDag-Erling Smørgrav 		if(!iter_ns_probability(qstate->env->rnd, toget, missing)) {
1516b7579f77SDag-Erling Smørgrav 			/* do not select this one, next; select toget number
1517b7579f77SDag-Erling Smørgrav 			 * of items from a list one less in size */
1518b7579f77SDag-Erling Smørgrav 			missing --;
1519b7579f77SDag-Erling Smørgrav 			continue;
1520b7579f77SDag-Erling Smørgrav 		}
1521b7579f77SDag-Erling Smørgrav 
1522b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv6 && !ns->got6) {
1523b7579f77SDag-Erling Smørgrav 			/* Send the AAAA request. */
1524b7579f77SDag-Erling Smørgrav 			if(!generate_target_query(qstate, iq, id,
1525b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
1526b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_AAAA, iq->qchase.qclass)) {
1527b7579f77SDag-Erling Smørgrav 				*num = query_count;
1528b7579f77SDag-Erling Smørgrav 				if(query_count > 0)
1529b7579f77SDag-Erling Smørgrav 					qstate->ext_state[id] = module_wait_subquery;
1530b7579f77SDag-Erling Smørgrav 				return 0;
1531b7579f77SDag-Erling Smørgrav 			}
1532b7579f77SDag-Erling Smørgrav 			query_count++;
1533b7579f77SDag-Erling Smørgrav 		}
1534b7579f77SDag-Erling Smørgrav 		/* Send the A request. */
1535b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv4 && !ns->got4) {
1536b7579f77SDag-Erling Smørgrav 			if(!generate_target_query(qstate, iq, id,
1537b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
1538b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_A, iq->qchase.qclass)) {
1539b7579f77SDag-Erling Smørgrav 				*num = query_count;
1540b7579f77SDag-Erling Smørgrav 				if(query_count > 0)
1541b7579f77SDag-Erling Smørgrav 					qstate->ext_state[id] = module_wait_subquery;
1542b7579f77SDag-Erling Smørgrav 				return 0;
1543b7579f77SDag-Erling Smørgrav 			}
1544b7579f77SDag-Erling Smørgrav 			query_count++;
1545b7579f77SDag-Erling Smørgrav 		}
1546b7579f77SDag-Erling Smørgrav 
1547b7579f77SDag-Erling Smørgrav 		/* mark this target as in progress. */
1548b7579f77SDag-Erling Smørgrav 		ns->resolved = 1;
1549b7579f77SDag-Erling Smørgrav 		missing--;
1550b7579f77SDag-Erling Smørgrav 		toget--;
1551b7579f77SDag-Erling Smørgrav 		if(toget == 0)
1552b7579f77SDag-Erling Smørgrav 			break;
1553b7579f77SDag-Erling Smørgrav 	}
1554b7579f77SDag-Erling Smørgrav 	*num = query_count;
1555b7579f77SDag-Erling Smørgrav 	if(query_count > 0)
1556b7579f77SDag-Erling Smørgrav 		qstate->ext_state[id] = module_wait_subquery;
1557b7579f77SDag-Erling Smørgrav 
1558b7579f77SDag-Erling Smørgrav 	return 1;
1559b7579f77SDag-Erling Smørgrav }
1560b7579f77SDag-Erling Smørgrav 
156117d15b25SDag-Erling Smørgrav /** see if last resort is possible - does config allow queries to parent */
156217d15b25SDag-Erling Smørgrav static int
156317d15b25SDag-Erling Smørgrav can_have_last_resort(struct module_env* env, struct delegpt* dp,
156417d15b25SDag-Erling Smørgrav 	struct iter_qstate* iq)
156517d15b25SDag-Erling Smørgrav {
156617d15b25SDag-Erling Smørgrav 	struct delegpt* fwddp;
156717d15b25SDag-Erling Smørgrav 	struct iter_hints_stub* stub;
156817d15b25SDag-Erling Smørgrav 	/* do not process a last resort (the parent side) if a stub
156917d15b25SDag-Erling Smørgrav 	 * or forward is configured, because we do not want to go 'above'
157017d15b25SDag-Erling Smørgrav 	 * the configured servers */
157117d15b25SDag-Erling Smørgrav 	if(!dname_is_root(dp->name) && (stub = (struct iter_hints_stub*)
157217d15b25SDag-Erling Smørgrav 		name_tree_find(&env->hints->tree, dp->name, dp->namelen,
157317d15b25SDag-Erling Smørgrav 		dp->namelabs, iq->qchase.qclass)) &&
157417d15b25SDag-Erling Smørgrav 		/* has_parent side is turned off for stub_first, where we
157517d15b25SDag-Erling Smørgrav 		 * are allowed to go to the parent */
157617d15b25SDag-Erling Smørgrav 		stub->dp->has_parent_side_NS) {
157717d15b25SDag-Erling Smørgrav 		verbose(VERB_QUERY, "configured stub servers failed -- returning SERVFAIL");
157817d15b25SDag-Erling Smørgrav 		return 0;
157917d15b25SDag-Erling Smørgrav 	}
158017d15b25SDag-Erling Smørgrav 	if((fwddp = forwards_find(env->fwds, dp->name, iq->qchase.qclass)) &&
158117d15b25SDag-Erling Smørgrav 		/* has_parent_side is turned off for forward_first, where
158217d15b25SDag-Erling Smørgrav 		 * we are allowed to go to the parent */
158317d15b25SDag-Erling Smørgrav 		fwddp->has_parent_side_NS) {
158417d15b25SDag-Erling Smørgrav 		verbose(VERB_QUERY, "configured forward servers failed -- returning SERVFAIL");
158517d15b25SDag-Erling Smørgrav 		return 0;
158617d15b25SDag-Erling Smørgrav 	}
158717d15b25SDag-Erling Smørgrav 	return 1;
158817d15b25SDag-Erling Smørgrav }
158917d15b25SDag-Erling Smørgrav 
1590b7579f77SDag-Erling Smørgrav /**
1591b7579f77SDag-Erling Smørgrav  * Called by processQueryTargets when it would like extra targets to query
1592b7579f77SDag-Erling Smørgrav  * but it seems to be out of options.  At last resort some less appealing
1593b7579f77SDag-Erling Smørgrav  * options are explored.  If there are no more options, the result is SERVFAIL
1594b7579f77SDag-Erling Smørgrav  *
1595b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1596b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1597b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
1598b7579f77SDag-Erling Smørgrav  * @param id: module id.
1599b7579f77SDag-Erling Smørgrav  * @return true if the event requires more request processing immediately,
1600b7579f77SDag-Erling Smørgrav  *         false if not.
1601b7579f77SDag-Erling Smørgrav  */
1602b7579f77SDag-Erling Smørgrav static int
1603b7579f77SDag-Erling Smørgrav processLastResort(struct module_qstate* qstate, struct iter_qstate* iq,
1604b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
1605b7579f77SDag-Erling Smørgrav {
1606b7579f77SDag-Erling Smørgrav 	struct delegpt_ns* ns;
1607b7579f77SDag-Erling Smørgrav 	int query_count = 0;
1608b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "No more query targets, attempting last resort");
1609b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
1610b7579f77SDag-Erling Smørgrav 
161117d15b25SDag-Erling Smørgrav 	if(!can_have_last_resort(qstate->env, iq->dp, iq)) {
161217d15b25SDag-Erling Smørgrav 		/* fail -- no more targets, no more hope of targets, no hope
161317d15b25SDag-Erling Smørgrav 		 * of a response. */
161417d15b25SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
161517d15b25SDag-Erling Smørgrav 	}
16168ed2b524SDag-Erling Smørgrav 	if(!iq->dp->has_parent_side_NS && dname_is_root(iq->dp->name)) {
16178ed2b524SDag-Erling Smørgrav 		struct delegpt* p = hints_lookup_root(qstate->env->hints,
16188ed2b524SDag-Erling Smørgrav 			iq->qchase.qclass);
16198ed2b524SDag-Erling Smørgrav 		if(p) {
16208ed2b524SDag-Erling Smørgrav 			struct delegpt_ns* ns;
16218ed2b524SDag-Erling Smørgrav 			struct delegpt_addr* a;
16228ed2b524SDag-Erling Smørgrav 			iq->chase_flags &= ~BIT_RD; /* go to authorities */
16238ed2b524SDag-Erling Smørgrav 			for(ns = p->nslist; ns; ns=ns->next) {
16248ed2b524SDag-Erling Smørgrav 				(void)delegpt_add_ns(iq->dp, qstate->region,
162517d15b25SDag-Erling Smørgrav 					ns->name, ns->lame);
16268ed2b524SDag-Erling Smørgrav 			}
16278ed2b524SDag-Erling Smørgrav 			for(a = p->target_list; a; a=a->next_target) {
16288ed2b524SDag-Erling Smørgrav 				(void)delegpt_add_addr(iq->dp, qstate->region,
16298ed2b524SDag-Erling Smørgrav 					&a->addr, a->addrlen, a->bogus,
16308ed2b524SDag-Erling Smørgrav 					a->lame);
16318ed2b524SDag-Erling Smørgrav 			}
16328ed2b524SDag-Erling Smørgrav 		}
16338ed2b524SDag-Erling Smørgrav 		iq->dp->has_parent_side_NS = 1;
16348ed2b524SDag-Erling Smørgrav 	} else if(!iq->dp->has_parent_side_NS) {
1635b7579f77SDag-Erling Smørgrav 		if(!iter_lookup_parent_NS_from_cache(qstate->env, iq->dp,
1636b7579f77SDag-Erling Smørgrav 			qstate->region, &qstate->qinfo)
1637b7579f77SDag-Erling Smørgrav 			|| !iq->dp->has_parent_side_NS) {
1638b7579f77SDag-Erling Smørgrav 			/* if: malloc failure in lookup go up to try */
1639b7579f77SDag-Erling Smørgrav 			/* if: no parent NS in cache - go up one level */
1640b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "try to grab parent NS");
1641b7579f77SDag-Erling Smørgrav 			iq->store_parent_NS = iq->dp;
16428ed2b524SDag-Erling Smørgrav 			iq->chase_flags &= ~BIT_RD; /* go to authorities */
1643b7579f77SDag-Erling Smørgrav 			iq->deleg_msg = NULL;
1644b7579f77SDag-Erling Smørgrav 			iq->refetch_glue = 1;
1645b7579f77SDag-Erling Smørgrav 			iq->query_restart_count++;
1646b7579f77SDag-Erling Smørgrav 			iq->sent_count = 0;
164705ab2901SDag-Erling Smørgrav 			if(qstate->env->cfg->qname_minimisation)
164805ab2901SDag-Erling Smørgrav 				iq->minimisation_state = INIT_MINIMISE_STATE;
1649b7579f77SDag-Erling Smørgrav 			return next_state(iq, INIT_REQUEST_STATE);
1650b7579f77SDag-Erling Smørgrav 		}
1651b7579f77SDag-Erling Smørgrav 	}
1652b7579f77SDag-Erling Smørgrav 	/* see if that makes new names available */
1653b7579f77SDag-Erling Smørgrav 	if(!cache_fill_missing(qstate->env, iq->qchase.qclass,
1654b7579f77SDag-Erling Smørgrav 		qstate->region, iq->dp))
1655b7579f77SDag-Erling Smørgrav 		log_err("out of memory in cache_fill_missing");
1656b7579f77SDag-Erling Smørgrav 	if(iq->dp->usable_list) {
1657b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "try parent-side-name, w. glue from cache");
1658b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
1659b7579f77SDag-Erling Smørgrav 	}
1660b7579f77SDag-Erling Smørgrav 	/* try to fill out parent glue from cache */
1661b7579f77SDag-Erling Smørgrav 	if(iter_lookup_parent_glue_from_cache(qstate->env, iq->dp,
1662b7579f77SDag-Erling Smørgrav 		qstate->region, &qstate->qinfo)) {
1663b7579f77SDag-Erling Smørgrav 		/* got parent stuff from cache, see if we can continue */
1664b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "try parent-side glue from cache");
1665b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
1666b7579f77SDag-Erling Smørgrav 	}
1667b7579f77SDag-Erling Smørgrav 	/* query for an extra name added by the parent-NS record */
1668b7579f77SDag-Erling Smørgrav 	if(delegpt_count_missing_targets(iq->dp) > 0) {
1669b7579f77SDag-Erling Smørgrav 		int qs = 0;
1670b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "try parent-side target name");
1671b7579f77SDag-Erling Smørgrav 		if(!query_for_targets(qstate, iq, ie, id, 1, &qs)) {
1672b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1673b7579f77SDag-Erling Smørgrav 		}
1674b7579f77SDag-Erling Smørgrav 		iq->num_target_queries += qs;
167552df462fSXin LI 		target_count_increase(iq, qs);
1676b7579f77SDag-Erling Smørgrav 		if(qs != 0) {
1677b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_subquery;
1678b7579f77SDag-Erling Smørgrav 			return 0; /* and wait for them */
1679b7579f77SDag-Erling Smørgrav 		}
1680b7579f77SDag-Erling Smørgrav 	}
1681b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth) {
1682b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "maxdepth and need more nameservers, fail");
1683b7579f77SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
1684b7579f77SDag-Erling Smørgrav 	}
168552df462fSXin LI 	if(iq->depth > 0 && iq->target_count &&
168652df462fSXin LI 		iq->target_count[1] > MAX_TARGET_COUNT) {
16876480faa8SDag-Erling Smørgrav 		char s[LDNS_MAX_DOMAINLEN+1];
16886480faa8SDag-Erling Smørgrav 		dname_str(qstate->qinfo.qname, s);
16896480faa8SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request %s has exceeded the maximum "
16906480faa8SDag-Erling Smørgrav 			"number of glue fetches %d", s, iq->target_count[1]);
169152df462fSXin LI 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
169252df462fSXin LI 	}
1693b7579f77SDag-Erling Smørgrav 	/* mark cycle targets for parent-side lookups */
1694b7579f77SDag-Erling Smørgrav 	iter_mark_pside_cycle_targets(qstate, iq->dp);
1695b7579f77SDag-Erling Smørgrav 	/* see if we can issue queries to get nameserver addresses */
1696b7579f77SDag-Erling Smørgrav 	/* this lookup is not randomized, but sequential. */
1697b7579f77SDag-Erling Smørgrav 	for(ns = iq->dp->nslist; ns; ns = ns->next) {
1698b7579f77SDag-Erling Smørgrav 		/* query for parent-side A and AAAA for nameservers */
1699b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv6 && !ns->done_pside6) {
1700b7579f77SDag-Erling Smørgrav 			/* Send the AAAA request. */
1701b7579f77SDag-Erling Smørgrav 			if(!generate_parentside_target_query(qstate, iq, id,
1702b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
1703b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_AAAA, iq->qchase.qclass))
1704b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1705b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
1706b7579f77SDag-Erling Smørgrav 			ns->done_pside6 = 1;
1707b7579f77SDag-Erling Smørgrav 			query_count++;
1708b7579f77SDag-Erling Smørgrav 		}
1709b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv4 && !ns->done_pside4) {
1710b7579f77SDag-Erling Smørgrav 			/* Send the A request. */
1711b7579f77SDag-Erling Smørgrav 			if(!generate_parentside_target_query(qstate, iq, id,
1712b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
1713b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_A, iq->qchase.qclass))
1714b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1715b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
1716b7579f77SDag-Erling Smørgrav 			ns->done_pside4 = 1;
1717b7579f77SDag-Erling Smørgrav 			query_count++;
1718b7579f77SDag-Erling Smørgrav 		}
1719b7579f77SDag-Erling Smørgrav 		if(query_count != 0) { /* suspend to await results */
1720b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "try parent-side glue lookup");
1721b7579f77SDag-Erling Smørgrav 			iq->num_target_queries += query_count;
172252df462fSXin LI 			target_count_increase(iq, query_count);
1723b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_subquery;
1724b7579f77SDag-Erling Smørgrav 			return 0;
1725b7579f77SDag-Erling Smørgrav 		}
1726b7579f77SDag-Erling Smørgrav 	}
1727b7579f77SDag-Erling Smørgrav 
1728b7579f77SDag-Erling Smørgrav 	/* if this was a parent-side glue query itself, then store that
1729b7579f77SDag-Erling Smørgrav 	 * failure in cache. */
1730bc892140SDag-Erling Smørgrav 	if(!qstate->no_cache_store && iq->query_for_pside_glue
1731bc892140SDag-Erling Smørgrav 		&& !iq->pside_glue)
1732b7579f77SDag-Erling Smørgrav 			iter_store_parentside_neg(qstate->env, &qstate->qinfo,
1733b7579f77SDag-Erling Smørgrav 				iq->deleg_msg?iq->deleg_msg->rep:
1734b7579f77SDag-Erling Smørgrav 				(iq->response?iq->response->rep:NULL));
1735b7579f77SDag-Erling Smørgrav 
1736b7579f77SDag-Erling Smørgrav 	verbose(VERB_QUERY, "out of query targets -- returning SERVFAIL");
1737b7579f77SDag-Erling Smørgrav 	/* fail -- no more targets, no more hope of targets, no hope
1738b7579f77SDag-Erling Smørgrav 	 * of a response. */
1739b7579f77SDag-Erling Smørgrav 	return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
1740b7579f77SDag-Erling Smørgrav }
1741b7579f77SDag-Erling Smørgrav 
1742b7579f77SDag-Erling Smørgrav /**
1743b7579f77SDag-Erling Smørgrav  * Try to find the NS record set that will resolve a qtype DS query. Due
1744b7579f77SDag-Erling Smørgrav  * to grandparent/grandchild reasons we did not get a proper lookup right
1745b7579f77SDag-Erling Smørgrav  * away.  We need to create type NS queries until we get the right parent
1746b7579f77SDag-Erling Smørgrav  * for this lookup.  We remove labels from the query to find the right point.
1747b7579f77SDag-Erling Smørgrav  * If we end up at the old dp name, then there is no solution.
1748b7579f77SDag-Erling Smørgrav  *
1749b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1750b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1751b7579f77SDag-Erling Smørgrav  * @param id: module id.
1752b7579f77SDag-Erling Smørgrav  * @return true if the event requires more immediate processing, false if
1753b7579f77SDag-Erling Smørgrav  *         not. This is generally only true when forwarding the request to
1754b7579f77SDag-Erling Smørgrav  *         the final state (i.e., on answer).
1755b7579f77SDag-Erling Smørgrav  */
1756b7579f77SDag-Erling Smørgrav static int
17578ed2b524SDag-Erling Smørgrav processDSNSFind(struct module_qstate* qstate, struct iter_qstate* iq, int id)
1758b7579f77SDag-Erling Smørgrav {
1759b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq = NULL;
1760b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "processDSNSFind");
1761b7579f77SDag-Erling Smørgrav 
1762b7579f77SDag-Erling Smørgrav 	if(!iq->dsns_point) {
1763b7579f77SDag-Erling Smørgrav 		/* initialize */
1764b7579f77SDag-Erling Smørgrav 		iq->dsns_point = iq->qchase.qname;
1765b7579f77SDag-Erling Smørgrav 		iq->dsns_point_len = iq->qchase.qname_len;
1766b7579f77SDag-Erling Smørgrav 	}
1767b7579f77SDag-Erling Smørgrav 	/* robustcheck for internal error: we are not underneath the dp */
1768b7579f77SDag-Erling Smørgrav 	if(!dname_subdomain_c(iq->dsns_point, iq->dp->name)) {
1769b7579f77SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
1770b7579f77SDag-Erling Smørgrav 	}
1771b7579f77SDag-Erling Smørgrav 
1772b7579f77SDag-Erling Smørgrav 	/* go up one (more) step, until we hit the dp, if so, end */
1773b7579f77SDag-Erling Smørgrav 	dname_remove_label(&iq->dsns_point, &iq->dsns_point_len);
1774b7579f77SDag-Erling Smørgrav 	if(query_dname_compare(iq->dsns_point, iq->dp->name) == 0) {
1775b7579f77SDag-Erling Smørgrav 		/* there was no inbetween nameserver, use the old delegation
1776b7579f77SDag-Erling Smørgrav 		 * point again.  And this time, because dsns_point is nonNULL
1777b7579f77SDag-Erling Smørgrav 		 * we are going to accept the (bad) result */
1778b7579f77SDag-Erling Smørgrav 		iq->state = QUERYTARGETS_STATE;
1779b7579f77SDag-Erling Smørgrav 		return 1;
1780b7579f77SDag-Erling Smørgrav 	}
1781b7579f77SDag-Erling Smørgrav 	iq->state = DSNS_FIND_STATE;
1782b7579f77SDag-Erling Smørgrav 
1783b7579f77SDag-Erling Smørgrav 	/* spawn NS lookup (validation not needed, this is for DS lookup) */
1784b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_ALGO, "fetch nameservers",
1785b7579f77SDag-Erling Smørgrav 		iq->dsns_point, LDNS_RR_TYPE_NS, iq->qchase.qclass);
1786b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(iq->dsns_point, iq->dsns_point_len,
1787b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, iq->qchase.qclass, qstate, id, iq,
1788b7579f77SDag-Erling Smørgrav 		INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0)) {
1789b7579f77SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
1790b7579f77SDag-Erling Smørgrav 	}
1791b7579f77SDag-Erling Smørgrav 
1792b7579f77SDag-Erling Smørgrav 	return 0;
1793b7579f77SDag-Erling Smørgrav }
1794b7579f77SDag-Erling Smørgrav 
1795b7579f77SDag-Erling Smørgrav /**
1796b7579f77SDag-Erling Smørgrav  * This is the request event state where the request will be sent to one of
1797b7579f77SDag-Erling Smørgrav  * its current query targets. This state also handles issuing target lookup
1798b7579f77SDag-Erling Smørgrav  * queries for missing target IP addresses. Queries typically iterate on
1799b7579f77SDag-Erling Smørgrav  * this state, both when they are just trying different targets for a given
1800b7579f77SDag-Erling Smørgrav  * delegation point, and when they change delegation points. This state
1801b7579f77SDag-Erling Smørgrav  * roughly corresponds to RFC 1034 algorithm steps 3 and 4.
1802b7579f77SDag-Erling Smørgrav  *
1803b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1804b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1805b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
1806b7579f77SDag-Erling Smørgrav  * @param id: module id.
1807b7579f77SDag-Erling Smørgrav  * @return true if the event requires more request processing immediately,
1808b7579f77SDag-Erling Smørgrav  *         false if not. This state only returns true when it is generating
1809b7579f77SDag-Erling Smørgrav  *         a SERVFAIL response because the query has hit a dead end.
1810b7579f77SDag-Erling Smørgrav  */
1811b7579f77SDag-Erling Smørgrav static int
1812b7579f77SDag-Erling Smørgrav processQueryTargets(struct module_qstate* qstate, struct iter_qstate* iq,
1813b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
1814b7579f77SDag-Erling Smørgrav {
1815b7579f77SDag-Erling Smørgrav 	int tf_policy;
1816b7579f77SDag-Erling Smørgrav 	struct delegpt_addr* target;
1817b7579f77SDag-Erling Smørgrav 	struct outbound_entry* outq;
1818b7579f77SDag-Erling Smørgrav 
1819b7579f77SDag-Erling Smørgrav 	/* NOTE: a request will encounter this state for each target it
1820b7579f77SDag-Erling Smørgrav 	 * needs to send a query to. That is, at least one per referral,
1821b7579f77SDag-Erling Smørgrav 	 * more if some targets timeout or return throwaway answers. */
1822b7579f77SDag-Erling Smørgrav 
1823b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "processQueryTargets:", &qstate->qinfo);
1824b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "processQueryTargets: targetqueries %d, "
1825b7579f77SDag-Erling Smørgrav 		"currentqueries %d sentcount %d", iq->num_target_queries,
1826b7579f77SDag-Erling Smørgrav 		iq->num_current_queries, iq->sent_count);
1827b7579f77SDag-Erling Smørgrav 
1828b7579f77SDag-Erling Smørgrav 	/* Make sure that we haven't run away */
1829b7579f77SDag-Erling Smørgrav 	/* FIXME: is this check even necessary? */
1830b7579f77SDag-Erling Smørgrav 	if(iq->referral_count > MAX_REFERRAL_COUNT) {
1831b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum "
1832b7579f77SDag-Erling Smørgrav 			"number of referrrals with %d", iq->referral_count);
1833b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1834b7579f77SDag-Erling Smørgrav 	}
1835b7579f77SDag-Erling Smørgrav 	if(iq->sent_count > MAX_SENT_COUNT) {
1836b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum "
1837b7579f77SDag-Erling Smørgrav 			"number of sends with %d", iq->sent_count);
1838b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1839b7579f77SDag-Erling Smørgrav 	}
1840b7579f77SDag-Erling Smørgrav 
1841b7579f77SDag-Erling Smørgrav 	/* Make sure we have a delegation point, otherwise priming failed
1842b7579f77SDag-Erling Smørgrav 	 * or another failure occurred */
1843b7579f77SDag-Erling Smørgrav 	if(!iq->dp) {
1844b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "Failed to get a delegation, giving up");
1845b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1846b7579f77SDag-Erling Smørgrav 	}
1847b7579f77SDag-Erling Smørgrav 	if(!ie->supports_ipv6)
1848b7579f77SDag-Erling Smørgrav 		delegpt_no_ipv6(iq->dp);
1849b7579f77SDag-Erling Smørgrav 	if(!ie->supports_ipv4)
1850b7579f77SDag-Erling Smørgrav 		delegpt_no_ipv4(iq->dp);
1851b7579f77SDag-Erling Smørgrav 	delegpt_log(VERB_ALGO, iq->dp);
1852b7579f77SDag-Erling Smørgrav 
1853b7579f77SDag-Erling Smørgrav 	if(iq->num_current_queries>0) {
1854b7579f77SDag-Erling Smørgrav 		/* already busy answering a query, this restart is because
1855b7579f77SDag-Erling Smørgrav 		 * more delegpt addrs became available, wait for existing
1856b7579f77SDag-Erling Smørgrav 		 * query. */
1857b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "woke up, but wait for outstanding query");
1858b7579f77SDag-Erling Smørgrav 		qstate->ext_state[id] = module_wait_reply;
1859b7579f77SDag-Erling Smørgrav 		return 0;
1860b7579f77SDag-Erling Smørgrav 	}
1861b7579f77SDag-Erling Smørgrav 
1862b7579f77SDag-Erling Smørgrav 	tf_policy = 0;
1863b7579f77SDag-Erling Smørgrav 	/* < not <=, because although the array is large enough for <=, the
1864b7579f77SDag-Erling Smørgrav 	 * generated query will immediately be discarded due to depth and
1865b7579f77SDag-Erling Smørgrav 	 * that servfail is cached, which is not good as opportunism goes. */
1866b7579f77SDag-Erling Smørgrav 	if(iq->depth < ie->max_dependency_depth
1867b7579f77SDag-Erling Smørgrav 		&& iq->sent_count < TARGET_FETCH_STOP) {
1868b7579f77SDag-Erling Smørgrav 		tf_policy = ie->target_fetch_policy[iq->depth];
1869b7579f77SDag-Erling Smørgrav 	}
1870b7579f77SDag-Erling Smørgrav 
1871b7579f77SDag-Erling Smørgrav 	/* if in 0x20 fallback get as many targets as possible */
1872b7579f77SDag-Erling Smørgrav 	if(iq->caps_fallback) {
1873b7579f77SDag-Erling Smørgrav 		int extra = 0;
1874b7579f77SDag-Erling Smørgrav 		size_t naddr, nres, navail;
1875b7579f77SDag-Erling Smørgrav 		if(!query_for_targets(qstate, iq, ie, id, -1, &extra)) {
1876b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1877b7579f77SDag-Erling Smørgrav 		}
1878b7579f77SDag-Erling Smørgrav 		iq->num_target_queries += extra;
187952df462fSXin LI 		target_count_increase(iq, extra);
1880b7579f77SDag-Erling Smørgrav 		if(iq->num_target_queries > 0) {
1881b7579f77SDag-Erling Smørgrav 			/* wait to get all targets, we want to try em */
1882b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "wait for all targets for fallback");
1883b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_reply;
1884b7579f77SDag-Erling Smørgrav 			return 0;
1885b7579f77SDag-Erling Smørgrav 		}
1886b7579f77SDag-Erling Smørgrav 		/* did we do enough fallback queries already? */
1887b7579f77SDag-Erling Smørgrav 		delegpt_count_addr(iq->dp, &naddr, &nres, &navail);
1888b7579f77SDag-Erling Smørgrav 		/* the current caps_server is the number of fallbacks sent.
1889b7579f77SDag-Erling Smørgrav 		 * the original query is one that matched too, so we have
1890b7579f77SDag-Erling Smørgrav 		 * caps_server+1 number of matching queries now */
1891b7579f77SDag-Erling Smørgrav 		if(iq->caps_server+1 >= naddr*3 ||
189209a3aaf3SDag-Erling Smørgrav 			iq->caps_server*2+2 >= MAX_SENT_COUNT) {
189309a3aaf3SDag-Erling Smørgrav 			/* *2 on sentcount check because ipv6 may fail */
1894b7579f77SDag-Erling Smørgrav 			/* we're done, process the response */
1895b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "0x20 fallback had %d responses "
1896b7579f77SDag-Erling Smørgrav 				"match for %d wanted, done.",
1897b7579f77SDag-Erling Smørgrav 				(int)iq->caps_server+1, (int)naddr*3);
189809a3aaf3SDag-Erling Smørgrav 			iq->response = iq->caps_response;
1899b7579f77SDag-Erling Smørgrav 			iq->caps_fallback = 0;
1900b7579f77SDag-Erling Smørgrav 			iter_dec_attempts(iq->dp, 3); /* space for fallback */
1901b7579f77SDag-Erling Smørgrav 			iq->num_current_queries++; /* RespState decrements it*/
1902b7579f77SDag-Erling Smørgrav 			iq->referral_count++; /* make sure we don't loop */
1903b7579f77SDag-Erling Smørgrav 			iq->sent_count = 0;
1904b7579f77SDag-Erling Smørgrav 			iq->state = QUERY_RESP_STATE;
1905b7579f77SDag-Erling Smørgrav 			return 1;
1906b7579f77SDag-Erling Smørgrav 		}
1907b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "0x20 fallback number %d",
1908b7579f77SDag-Erling Smørgrav 			(int)iq->caps_server);
1909b7579f77SDag-Erling Smørgrav 
1910b7579f77SDag-Erling Smørgrav 	/* if there is a policy to fetch missing targets
1911b7579f77SDag-Erling Smørgrav 	 * opportunistically, do it. we rely on the fact that once a
1912b7579f77SDag-Erling Smørgrav 	 * query (or queries) for a missing name have been issued,
1913b7579f77SDag-Erling Smørgrav 	 * they will not show up again. */
1914b7579f77SDag-Erling Smørgrav 	} else if(tf_policy != 0) {
1915b7579f77SDag-Erling Smørgrav 		int extra = 0;
1916b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "attempt to get extra %d targets",
1917b7579f77SDag-Erling Smørgrav 			tf_policy);
1918b7579f77SDag-Erling Smørgrav 		(void)query_for_targets(qstate, iq, ie, id, tf_policy, &extra);
1919b7579f77SDag-Erling Smørgrav 		/* errors ignored, these targets are not strictly necessary for
1920b7579f77SDag-Erling Smørgrav 		 * this result, we do not have to reply with SERVFAIL */
1921b7579f77SDag-Erling Smørgrav 		iq->num_target_queries += extra;
192252df462fSXin LI 		target_count_increase(iq, extra);
1923b7579f77SDag-Erling Smørgrav 	}
1924b7579f77SDag-Erling Smørgrav 
1925b7579f77SDag-Erling Smørgrav 	/* Add the current set of unused targets to our queue. */
1926b7579f77SDag-Erling Smørgrav 	delegpt_add_unused_targets(iq->dp);
1927b7579f77SDag-Erling Smørgrav 
1928b7579f77SDag-Erling Smørgrav 	/* Select the next usable target, filtering out unsuitable targets. */
1929b7579f77SDag-Erling Smørgrav 	target = iter_server_selection(ie, qstate->env, iq->dp,
1930b7579f77SDag-Erling Smørgrav 		iq->dp->name, iq->dp->namelen, iq->qchase.qtype,
1931b7579f77SDag-Erling Smørgrav 		&iq->dnssec_lame_query, &iq->chase_to_rd,
1932b7579f77SDag-Erling Smørgrav 		iq->num_target_queries, qstate->blacklist);
1933b7579f77SDag-Erling Smørgrav 
1934b7579f77SDag-Erling Smørgrav 	/* If no usable target was selected... */
1935b7579f77SDag-Erling Smørgrav 	if(!target) {
1936b7579f77SDag-Erling Smørgrav 		/* Here we distinguish between three states: generate a new
1937b7579f77SDag-Erling Smørgrav 		 * target query, just wait, or quit (with a SERVFAIL).
1938b7579f77SDag-Erling Smørgrav 		 * We have the following information: number of active
1939b7579f77SDag-Erling Smørgrav 		 * target queries, number of active current queries,
1940b7579f77SDag-Erling Smørgrav 		 * the presence of missing targets at this delegation
1941b7579f77SDag-Erling Smørgrav 		 * point, and the given query target policy. */
1942b7579f77SDag-Erling Smørgrav 
1943b7579f77SDag-Erling Smørgrav 		/* Check for the wait condition. If this is true, then
1944b7579f77SDag-Erling Smørgrav 		 * an action must be taken. */
1945b7579f77SDag-Erling Smørgrav 		if(iq->num_target_queries==0 && iq->num_current_queries==0) {
1946b7579f77SDag-Erling Smørgrav 			/* If there is nothing to wait for, then we need
1947b7579f77SDag-Erling Smørgrav 			 * to distinguish between generating (a) new target
1948b7579f77SDag-Erling Smørgrav 			 * query, or failing. */
1949b7579f77SDag-Erling Smørgrav 			if(delegpt_count_missing_targets(iq->dp) > 0) {
1950b7579f77SDag-Erling Smørgrav 				int qs = 0;
1951b7579f77SDag-Erling Smørgrav 				verbose(VERB_ALGO, "querying for next "
1952b7579f77SDag-Erling Smørgrav 					"missing target");
1953b7579f77SDag-Erling Smørgrav 				if(!query_for_targets(qstate, iq, ie, id,
1954b7579f77SDag-Erling Smørgrav 					1, &qs)) {
1955b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1956b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1957b7579f77SDag-Erling Smørgrav 				}
1958b7579f77SDag-Erling Smørgrav 				if(qs == 0 &&
1959b7579f77SDag-Erling Smørgrav 				   delegpt_count_missing_targets(iq->dp) == 0){
1960b7579f77SDag-Erling Smørgrav 					/* it looked like there were missing
1961b7579f77SDag-Erling Smørgrav 					 * targets, but they did not turn up.
1962b7579f77SDag-Erling Smørgrav 					 * Try the bad choices again (if any),
1963b7579f77SDag-Erling Smørgrav 					 * when we get back here missing==0,
1964b7579f77SDag-Erling Smørgrav 					 * so this is not a loop. */
1965b7579f77SDag-Erling Smørgrav 					return 1;
1966b7579f77SDag-Erling Smørgrav 				}
1967b7579f77SDag-Erling Smørgrav 				iq->num_target_queries += qs;
196852df462fSXin LI 				target_count_increase(iq, qs);
1969b7579f77SDag-Erling Smørgrav 			}
1970b7579f77SDag-Erling Smørgrav 			/* Since a target query might have been made, we
1971b7579f77SDag-Erling Smørgrav 			 * need to check again. */
1972b7579f77SDag-Erling Smørgrav 			if(iq->num_target_queries == 0) {
197309a3aaf3SDag-Erling Smørgrav 				/* if in capsforid fallback, instead of last
197409a3aaf3SDag-Erling Smørgrav 				 * resort, we agree with the current reply
197509a3aaf3SDag-Erling Smørgrav 				 * we have (if any) (our count of addrs bad)*/
197609a3aaf3SDag-Erling Smørgrav 				if(iq->caps_fallback && iq->caps_reply) {
197709a3aaf3SDag-Erling Smørgrav 					/* we're done, process the response */
197809a3aaf3SDag-Erling Smørgrav 					verbose(VERB_ALGO, "0x20 fallback had %d responses, "
197909a3aaf3SDag-Erling Smørgrav 						"but no more servers except "
198009a3aaf3SDag-Erling Smørgrav 						"last resort, done.",
198109a3aaf3SDag-Erling Smørgrav 						(int)iq->caps_server+1);
198209a3aaf3SDag-Erling Smørgrav 					iq->response = iq->caps_response;
198309a3aaf3SDag-Erling Smørgrav 					iq->caps_fallback = 0;
198409a3aaf3SDag-Erling Smørgrav 					iter_dec_attempts(iq->dp, 3); /* space for fallback */
198509a3aaf3SDag-Erling Smørgrav 					iq->num_current_queries++; /* RespState decrements it*/
198609a3aaf3SDag-Erling Smørgrav 					iq->referral_count++; /* make sure we don't loop */
198709a3aaf3SDag-Erling Smørgrav 					iq->sent_count = 0;
198809a3aaf3SDag-Erling Smørgrav 					iq->state = QUERY_RESP_STATE;
198909a3aaf3SDag-Erling Smørgrav 					return 1;
199009a3aaf3SDag-Erling Smørgrav 				}
1991b7579f77SDag-Erling Smørgrav 				return processLastResort(qstate, iq, ie, id);
1992b7579f77SDag-Erling Smørgrav 			}
1993b7579f77SDag-Erling Smørgrav 		}
1994b7579f77SDag-Erling Smørgrav 
1995b7579f77SDag-Erling Smørgrav 		/* otherwise, we have no current targets, so submerge
1996b7579f77SDag-Erling Smørgrav 		 * until one of the target or direct queries return. */
1997b7579f77SDag-Erling Smørgrav 		if(iq->num_target_queries>0 && iq->num_current_queries>0) {
1998b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "no current targets -- waiting "
1999b7579f77SDag-Erling Smørgrav 				"for %d targets to resolve or %d outstanding"
2000b7579f77SDag-Erling Smørgrav 				" queries to respond", iq->num_target_queries,
2001b7579f77SDag-Erling Smørgrav 				iq->num_current_queries);
2002b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_reply;
2003b7579f77SDag-Erling Smørgrav 		} else if(iq->num_target_queries>0) {
2004b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "no current targets -- waiting "
2005b7579f77SDag-Erling Smørgrav 				"for %d targets to resolve.",
2006b7579f77SDag-Erling Smørgrav 				iq->num_target_queries);
2007b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_subquery;
2008b7579f77SDag-Erling Smørgrav 		} else {
2009b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "no current targets -- waiting "
2010b7579f77SDag-Erling Smørgrav 				"for %d outstanding queries to respond.",
2011b7579f77SDag-Erling Smørgrav 				iq->num_current_queries);
2012b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_reply;
2013b7579f77SDag-Erling Smørgrav 		}
2014b7579f77SDag-Erling Smørgrav 		return 0;
2015b7579f77SDag-Erling Smørgrav 	}
2016b7579f77SDag-Erling Smørgrav 
201709a3aaf3SDag-Erling Smørgrav 	/* if not forwarding, check ratelimits per delegationpoint name */
201809a3aaf3SDag-Erling Smørgrav 	if(!(iq->chase_flags & BIT_RD) && !iq->ratelimit_ok) {
201909a3aaf3SDag-Erling Smørgrav 		if(!infra_ratelimit_inc(qstate->env->infra_cache, iq->dp->name,
202009a3aaf3SDag-Erling Smørgrav 			iq->dp->namelen, *qstate->env->now)) {
202109a3aaf3SDag-Erling Smørgrav 			verbose(VERB_ALGO, "query exceeded ratelimits");
202209a3aaf3SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
202309a3aaf3SDag-Erling Smørgrav 		}
202409a3aaf3SDag-Erling Smørgrav 	}
202509a3aaf3SDag-Erling Smørgrav 
202605ab2901SDag-Erling Smørgrav 	if(iq->minimisation_state == INIT_MINIMISE_STATE) {
2027e2d15004SDag-Erling Smørgrav 		/* (Re)set qinfo_out to (new) delegation point, except when
2028e2d15004SDag-Erling Smørgrav 		 * qinfo_out is already a subdomain of dp. This happens when
2029e2d15004SDag-Erling Smørgrav 		 * increasing by more than one label at once (QNAMEs with more
2030e2d15004SDag-Erling Smørgrav 		 * than MAX_MINIMISE_COUNT labels). */
203105ab2901SDag-Erling Smørgrav 		if(!(iq->qinfo_out.qname_len
203205ab2901SDag-Erling Smørgrav 			&& dname_subdomain_c(iq->qchase.qname,
203305ab2901SDag-Erling Smørgrav 				iq->qinfo_out.qname)
203405ab2901SDag-Erling Smørgrav 			&& dname_subdomain_c(iq->qinfo_out.qname,
203505ab2901SDag-Erling Smørgrav 				iq->dp->name))) {
203605ab2901SDag-Erling Smørgrav 			iq->qinfo_out.qname = iq->dp->name;
203705ab2901SDag-Erling Smørgrav 			iq->qinfo_out.qname_len = iq->dp->namelen;
2038b5663de9SDag-Erling Smørgrav 			iq->qinfo_out.qtype = LDNS_RR_TYPE_A;
203905ab2901SDag-Erling Smørgrav 			iq->qinfo_out.qclass = iq->qchase.qclass;
2040bc892140SDag-Erling Smørgrav 			iq->qinfo_out.local_alias = NULL;
2041e2d15004SDag-Erling Smørgrav 			iq->minimise_count = 0;
204205ab2901SDag-Erling Smørgrav 		}
204305ab2901SDag-Erling Smørgrav 
204405ab2901SDag-Erling Smørgrav 		iq->minimisation_state = MINIMISE_STATE;
204505ab2901SDag-Erling Smørgrav 	}
204605ab2901SDag-Erling Smørgrav 	if(iq->minimisation_state == MINIMISE_STATE) {
2047e2d15004SDag-Erling Smørgrav 		int qchaselabs = dname_count_labels(iq->qchase.qname);
2048e2d15004SDag-Erling Smørgrav 		int labdiff = qchaselabs -
204905ab2901SDag-Erling Smørgrav 			dname_count_labels(iq->qinfo_out.qname);
205005ab2901SDag-Erling Smørgrav 
205105ab2901SDag-Erling Smørgrav 		iq->qinfo_out.qname = iq->qchase.qname;
205205ab2901SDag-Erling Smørgrav 		iq->qinfo_out.qname_len = iq->qchase.qname_len;
2053e2d15004SDag-Erling Smørgrav 		iq->minimise_count++;
2054b5663de9SDag-Erling Smørgrav 		iq->minimise_timeout_count = 0;
2055b5663de9SDag-Erling Smørgrav 
2056b5663de9SDag-Erling Smørgrav 		iter_dec_attempts(iq->dp, 1);
205705ab2901SDag-Erling Smørgrav 
2058e2d15004SDag-Erling Smørgrav 		/* Limit number of iterations for QNAMEs with more
2059e2d15004SDag-Erling Smørgrav 		 * than MAX_MINIMISE_COUNT labels. Send first MINIMISE_ONE_LAB
2060e2d15004SDag-Erling Smørgrav 		 * labels of QNAME always individually.
2061e2d15004SDag-Erling Smørgrav 		 */
2062e2d15004SDag-Erling Smørgrav 		if(qchaselabs > MAX_MINIMISE_COUNT && labdiff > 1 &&
2063e2d15004SDag-Erling Smørgrav 			iq->minimise_count > MINIMISE_ONE_LAB) {
2064e2d15004SDag-Erling Smørgrav 			if(iq->minimise_count < MAX_MINIMISE_COUNT) {
2065e2d15004SDag-Erling Smørgrav 				int multilabs = qchaselabs - 1 -
2066e2d15004SDag-Erling Smørgrav 					MINIMISE_ONE_LAB;
2067e2d15004SDag-Erling Smørgrav 				int extralabs = multilabs /
2068e2d15004SDag-Erling Smørgrav 					MINIMISE_MULTIPLE_LABS;
2069e2d15004SDag-Erling Smørgrav 
2070e2d15004SDag-Erling Smørgrav 				if (MAX_MINIMISE_COUNT - iq->minimise_count >=
2071e2d15004SDag-Erling Smørgrav 					multilabs % MINIMISE_MULTIPLE_LABS)
2072e2d15004SDag-Erling Smørgrav 					/* Default behaviour is to add 1 label
2073e2d15004SDag-Erling Smørgrav 					 * every iteration. Therefore, decrement
2074e2d15004SDag-Erling Smørgrav 					 * the extralabs by 1 */
2075e2d15004SDag-Erling Smørgrav 					extralabs--;
2076e2d15004SDag-Erling Smørgrav 				if (extralabs < labdiff)
2077e2d15004SDag-Erling Smørgrav 					labdiff -= extralabs;
2078e2d15004SDag-Erling Smørgrav 				else
2079e2d15004SDag-Erling Smørgrav 					labdiff = 1;
2080e2d15004SDag-Erling Smørgrav 			}
2081e2d15004SDag-Erling Smørgrav 			/* Last minimised iteration, send all labels with
2082e2d15004SDag-Erling Smørgrav 			 * QTYPE=NS */
2083e2d15004SDag-Erling Smørgrav 			else
2084e2d15004SDag-Erling Smørgrav 				labdiff = 1;
208505ab2901SDag-Erling Smørgrav 		}
208605ab2901SDag-Erling Smørgrav 
208705ab2901SDag-Erling Smørgrav 		if(labdiff > 1) {
208805ab2901SDag-Erling Smørgrav 			verbose(VERB_QUERY, "removing %d labels", labdiff-1);
208905ab2901SDag-Erling Smørgrav 			dname_remove_labels(&iq->qinfo_out.qname,
209005ab2901SDag-Erling Smørgrav 				&iq->qinfo_out.qname_len,
209105ab2901SDag-Erling Smørgrav 				labdiff-1);
209205ab2901SDag-Erling Smørgrav 		}
2093b5663de9SDag-Erling Smørgrav 		if(labdiff < 1 || (labdiff < 2
2094b5663de9SDag-Erling Smørgrav 			&& (iq->qchase.qtype == LDNS_RR_TYPE_DS
2095b5663de9SDag-Erling Smørgrav 			|| iq->qchase.qtype == LDNS_RR_TYPE_A)))
209605ab2901SDag-Erling Smørgrav 			/* Stop minimising this query, resolve "as usual" */
209705ab2901SDag-Erling Smørgrav 			iq->minimisation_state = DONOT_MINIMISE_STATE;
2098bc892140SDag-Erling Smørgrav 		else if(!qstate->no_cache_lookup) {
209905ab2901SDag-Erling Smørgrav 			struct dns_msg* msg = dns_cache_lookup(qstate->env,
210005ab2901SDag-Erling Smørgrav 				iq->qinfo_out.qname, iq->qinfo_out.qname_len,
210105ab2901SDag-Erling Smørgrav 				iq->qinfo_out.qtype, iq->qinfo_out.qclass,
210205ab2901SDag-Erling Smørgrav 				qstate->query_flags, qstate->region,
210305ab2901SDag-Erling Smørgrav 				qstate->env->scratch);
210405ab2901SDag-Erling Smørgrav 			if(msg && msg->rep->an_numrrsets == 0
210505ab2901SDag-Erling Smørgrav 				&& FLAGS_GET_RCODE(msg->rep->flags) ==
210605ab2901SDag-Erling Smørgrav 				LDNS_RCODE_NOERROR)
210705ab2901SDag-Erling Smørgrav 				/* no need to send query if it is already
210805ab2901SDag-Erling Smørgrav 				 * cached as NOERROR/NODATA */
210905ab2901SDag-Erling Smørgrav 				return 1;
211005ab2901SDag-Erling Smørgrav 		}
211105ab2901SDag-Erling Smørgrav 	}
2112b5663de9SDag-Erling Smørgrav 	if(iq->minimisation_state == SKIP_MINIMISE_STATE) {
2113b5663de9SDag-Erling Smørgrav 		iq->minimise_timeout_count++;
2114b5663de9SDag-Erling Smørgrav 		if(iq->minimise_timeout_count < MAX_MINIMISE_TIMEOUT_COUNT)
211505ab2901SDag-Erling Smørgrav 			/* Do not increment qname, continue incrementing next
211605ab2901SDag-Erling Smørgrav 			 * iteration */
211705ab2901SDag-Erling Smørgrav 			iq->minimisation_state = MINIMISE_STATE;
2118bc892140SDag-Erling Smørgrav 		else if(!qstate->env->cfg->qname_minimisation_strict)
2119b5663de9SDag-Erling Smørgrav 			/* Too many time-outs detected for this QNAME and QTYPE.
2120b5663de9SDag-Erling Smørgrav 			 * We give up, disable QNAME minimisation. */
2121b5663de9SDag-Erling Smørgrav 			iq->minimisation_state = DONOT_MINIMISE_STATE;
2122b5663de9SDag-Erling Smørgrav 	}
212305ab2901SDag-Erling Smørgrav 	if(iq->minimisation_state == DONOT_MINIMISE_STATE)
212405ab2901SDag-Erling Smørgrav 		iq->qinfo_out = iq->qchase;
212505ab2901SDag-Erling Smørgrav 
2126b7579f77SDag-Erling Smørgrav 	/* We have a valid target. */
2127b7579f77SDag-Erling Smørgrav 	if(verbosity >= VERB_QUERY) {
212805ab2901SDag-Erling Smørgrav 		log_query_info(VERB_QUERY, "sending query:", &iq->qinfo_out);
2129b7579f77SDag-Erling Smørgrav 		log_name_addr(VERB_QUERY, "sending to target:", iq->dp->name,
2130b7579f77SDag-Erling Smørgrav 			&target->addr, target->addrlen);
2131b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "dnssec status: %s%s",
2132b7579f77SDag-Erling Smørgrav 			iq->dnssec_expected?"expected": "not expected",
2133b7579f77SDag-Erling Smørgrav 			iq->dnssec_lame_query?" but lame_query anyway": "");
2134b7579f77SDag-Erling Smørgrav 	}
2135b7579f77SDag-Erling Smørgrav 	fptr_ok(fptr_whitelist_modenv_send_query(qstate->env->send_query));
2136bc892140SDag-Erling Smørgrav 	outq = (*qstate->env->send_query)(&iq->qinfo_out,
2137e2d15004SDag-Erling Smørgrav 		iq->chase_flags | (iq->chase_to_rd?BIT_RD:0),
2138e2d15004SDag-Erling Smørgrav 		/* unset CD if to forwarder(RD set) and not dnssec retry
2139e2d15004SDag-Erling Smørgrav 		 * (blacklist nonempty) and no trust-anchors are configured
2140e2d15004SDag-Erling Smørgrav 		 * above the qname or on the first attempt when dnssec is on */
2141e2d15004SDag-Erling Smørgrav 		EDNS_DO| ((iq->chase_to_rd||(iq->chase_flags&BIT_RD)!=0)&&
2142e2d15004SDag-Erling Smørgrav 		!qstate->blacklist&&(!iter_indicates_dnssec_fwd(qstate->env,
2143e2d15004SDag-Erling Smørgrav 		&iq->qinfo_out)||target->attempts==1)?0:BIT_CD),
214409a3aaf3SDag-Erling Smørgrav 		iq->dnssec_expected, iq->caps_fallback || is_caps_whitelisted(
2145bc892140SDag-Erling Smørgrav 		ie, iq), &target->addr, target->addrlen,
2146bc892140SDag-Erling Smørgrav 		iq->dp->name, iq->dp->namelen,
2147bc892140SDag-Erling Smørgrav 		(iq->dp->ssl_upstream || qstate->env->cfg->ssl_upstream), qstate);
2148b7579f77SDag-Erling Smørgrav 	if(!outq) {
2149b7579f77SDag-Erling Smørgrav 		log_addr(VERB_DETAIL, "error sending query to auth server",
2150b7579f77SDag-Erling Smørgrav 			&target->addr, target->addrlen);
215109a3aaf3SDag-Erling Smørgrav 		if(!(iq->chase_flags & BIT_RD) && !iq->ratelimit_ok)
215209a3aaf3SDag-Erling Smørgrav 		    infra_ratelimit_dec(qstate->env->infra_cache, iq->dp->name,
215309a3aaf3SDag-Erling Smørgrav 			iq->dp->namelen, *qstate->env->now);
2154b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2155b7579f77SDag-Erling Smørgrav 	}
2156b7579f77SDag-Erling Smørgrav 	outbound_list_insert(&iq->outlist, outq);
2157b7579f77SDag-Erling Smørgrav 	iq->num_current_queries++;
2158b7579f77SDag-Erling Smørgrav 	iq->sent_count++;
2159b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_wait_reply;
2160b7579f77SDag-Erling Smørgrav 
2161b7579f77SDag-Erling Smørgrav 	return 0;
2162b7579f77SDag-Erling Smørgrav }
2163b7579f77SDag-Erling Smørgrav 
2164b7579f77SDag-Erling Smørgrav /** find NS rrset in given list */
2165b7579f77SDag-Erling Smørgrav static struct ub_packed_rrset_key*
2166b7579f77SDag-Erling Smørgrav find_NS(struct reply_info* rep, size_t from, size_t to)
2167b7579f77SDag-Erling Smørgrav {
2168b7579f77SDag-Erling Smørgrav 	size_t i;
2169b7579f77SDag-Erling Smørgrav 	for(i=from; i<to; i++) {
2170b7579f77SDag-Erling Smørgrav 		if(ntohs(rep->rrsets[i]->rk.type) == LDNS_RR_TYPE_NS)
2171b7579f77SDag-Erling Smørgrav 			return rep->rrsets[i];
2172b7579f77SDag-Erling Smørgrav 	}
2173b7579f77SDag-Erling Smørgrav 	return NULL;
2174b7579f77SDag-Erling Smørgrav }
2175b7579f77SDag-Erling Smørgrav 
2176b7579f77SDag-Erling Smørgrav 
2177b7579f77SDag-Erling Smørgrav /**
2178b7579f77SDag-Erling Smørgrav  * Process the query response. All queries end up at this state first. This
2179b7579f77SDag-Erling Smørgrav  * process generally consists of analyzing the response and routing the
2180b7579f77SDag-Erling Smørgrav  * event to the next state (either bouncing it back to a request state, or
2181b7579f77SDag-Erling Smørgrav  * terminating the processing for this event).
2182b7579f77SDag-Erling Smørgrav  *
2183b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2184b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
2185b7579f77SDag-Erling Smørgrav  * @param id: module id.
2186b7579f77SDag-Erling Smørgrav  * @return true if the event requires more immediate processing, false if
2187b7579f77SDag-Erling Smørgrav  *         not. This is generally only true when forwarding the request to
2188b7579f77SDag-Erling Smørgrav  *         the final state (i.e., on answer).
2189b7579f77SDag-Erling Smørgrav  */
2190b7579f77SDag-Erling Smørgrav static int
2191b7579f77SDag-Erling Smørgrav processQueryResponse(struct module_qstate* qstate, struct iter_qstate* iq,
2192b7579f77SDag-Erling Smørgrav 	int id)
2193b7579f77SDag-Erling Smørgrav {
2194b7579f77SDag-Erling Smørgrav 	int dnsseclame = 0;
2195b7579f77SDag-Erling Smørgrav 	enum response_type type;
2196b7579f77SDag-Erling Smørgrav 	iq->num_current_queries--;
2197*65b390aaSDag-Erling Smørgrav 
2198*65b390aaSDag-Erling Smørgrav 	if(!inplace_cb_query_response_call(qstate->env, qstate, iq->response))
2199*65b390aaSDag-Erling Smørgrav 		log_err("unable to call query_response callback");
2200*65b390aaSDag-Erling Smørgrav 
2201b7579f77SDag-Erling Smørgrav 	if(iq->response == NULL) {
220205ab2901SDag-Erling Smørgrav 		/* Don't increment qname when QNAME minimisation is enabled */
220305ab2901SDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation)
220405ab2901SDag-Erling Smørgrav 			iq->minimisation_state = SKIP_MINIMISE_STATE;
2205b7579f77SDag-Erling Smørgrav 		iq->chase_to_rd = 0;
2206b7579f77SDag-Erling Smørgrav 		iq->dnssec_lame_query = 0;
2207b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "query response was timeout");
2208b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2209b7579f77SDag-Erling Smørgrav 	}
2210b7579f77SDag-Erling Smørgrav 	type = response_type_from_server(
2211b7579f77SDag-Erling Smørgrav 		(int)((iq->chase_flags&BIT_RD) || iq->chase_to_rd),
2212b7579f77SDag-Erling Smørgrav 		iq->response, &iq->qchase, iq->dp);
2213b7579f77SDag-Erling Smørgrav 	iq->chase_to_rd = 0;
2214b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_REFERRAL && (iq->chase_flags&BIT_RD)) {
2215b7579f77SDag-Erling Smørgrav 		/* When forwarding (RD bit is set), we handle referrals
2216b7579f77SDag-Erling Smørgrav 		 * differently. No queries should be sent elsewhere */
2217b7579f77SDag-Erling Smørgrav 		type = RESPONSE_TYPE_ANSWER;
2218b7579f77SDag-Erling Smørgrav 	}
2219e2d15004SDag-Erling Smørgrav 	if(!qstate->env->cfg->disable_dnssec_lame_check && iq->dnssec_expected
2220e2d15004SDag-Erling Smørgrav                 && !iq->dnssec_lame_query &&
2221b7579f77SDag-Erling Smørgrav 		!(iq->chase_flags&BIT_RD)
2222e2d15004SDag-Erling Smørgrav 		&& iq->sent_count < DNSSEC_LAME_DETECT_COUNT
2223b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_LAME
2224b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_REC_LAME
2225b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_THROWAWAY
2226b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_UNTYPED) {
2227b7579f77SDag-Erling Smørgrav 		/* a possible answer, see if it is missing DNSSEC */
2228b7579f77SDag-Erling Smørgrav 		/* but not when forwarding, so we dont mark fwder lame */
222917d15b25SDag-Erling Smørgrav 		if(!iter_msg_has_dnssec(iq->response)) {
223017d15b25SDag-Erling Smørgrav 			/* Mark this address as dnsseclame in this dp,
223117d15b25SDag-Erling Smørgrav 			 * because that will make serverselection disprefer
223217d15b25SDag-Erling Smørgrav 			 * it, but also, once it is the only final option,
223317d15b25SDag-Erling Smørgrav 			 * use dnssec-lame-bypass if it needs to query there.*/
223417d15b25SDag-Erling Smørgrav 			if(qstate->reply) {
223517d15b25SDag-Erling Smørgrav 				struct delegpt_addr* a = delegpt_find_addr(
223617d15b25SDag-Erling Smørgrav 					iq->dp, &qstate->reply->addr,
223717d15b25SDag-Erling Smørgrav 					qstate->reply->addrlen);
223817d15b25SDag-Erling Smørgrav 				if(a) a->dnsseclame = 1;
223917d15b25SDag-Erling Smørgrav 			}
224017d15b25SDag-Erling Smørgrav 			/* test the answer is from the zone we expected,
2241b7579f77SDag-Erling Smørgrav 		 	 * otherwise, (due to parent,child on same server), we
2242b7579f77SDag-Erling Smørgrav 		 	 * might mark the server,zone lame inappropriately */
224317d15b25SDag-Erling Smørgrav 			if(!iter_msg_from_zone(iq->response, iq->dp, type,
224417d15b25SDag-Erling Smørgrav 				iq->qchase.qclass))
224517d15b25SDag-Erling Smørgrav 				qstate->reply = NULL;
2246b7579f77SDag-Erling Smørgrav 			type = RESPONSE_TYPE_LAME;
2247b7579f77SDag-Erling Smørgrav 			dnsseclame = 1;
2248b7579f77SDag-Erling Smørgrav 		}
2249b7579f77SDag-Erling Smørgrav 	} else iq->dnssec_lame_query = 0;
2250b7579f77SDag-Erling Smørgrav 	/* see if referral brings us close to the target */
2251b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_REFERRAL) {
2252b7579f77SDag-Erling Smørgrav 		struct ub_packed_rrset_key* ns = find_NS(
2253b7579f77SDag-Erling Smørgrav 			iq->response->rep, iq->response->rep->an_numrrsets,
2254b7579f77SDag-Erling Smørgrav 			iq->response->rep->an_numrrsets
2255b7579f77SDag-Erling Smørgrav 			+ iq->response->rep->ns_numrrsets);
2256b7579f77SDag-Erling Smørgrav 		if(!ns) ns = find_NS(iq->response->rep, 0,
2257b7579f77SDag-Erling Smørgrav 				iq->response->rep->an_numrrsets);
2258b7579f77SDag-Erling Smørgrav 		if(!ns || !dname_strict_subdomain_c(ns->rk.dname, iq->dp->name)
2259b7579f77SDag-Erling Smørgrav 			|| !dname_subdomain_c(iq->qchase.qname, ns->rk.dname)){
2260b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "bad referral, throwaway");
2261b7579f77SDag-Erling Smørgrav 			type = RESPONSE_TYPE_THROWAWAY;
2262b7579f77SDag-Erling Smørgrav 		} else
2263b7579f77SDag-Erling Smørgrav 			iter_scrub_ds(iq->response, ns, iq->dp->name);
2264b7579f77SDag-Erling Smørgrav 	} else iter_scrub_ds(iq->response, NULL, NULL);
2265*65b390aaSDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_THROWAWAY &&
2266*65b390aaSDag-Erling Smørgrav 		FLAGS_GET_RCODE(iq->response->rep->flags) == LDNS_RCODE_YXDOMAIN) {
2267*65b390aaSDag-Erling Smørgrav 		/* YXDOMAIN is a permanent error, no need to retry */
2268*65b390aaSDag-Erling Smørgrav 		type = RESPONSE_TYPE_ANSWER;
2269*65b390aaSDag-Erling Smørgrav 	}
2270*65b390aaSDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_CNAME && iq->response->rep->an_numrrsets >= 1
2271*65b390aaSDag-Erling Smørgrav 		&& ntohs(iq->response->rep->rrsets[0]->rk.type) == LDNS_RR_TYPE_DNAME) {
2272*65b390aaSDag-Erling Smørgrav 		uint8_t* sname = NULL;
2273*65b390aaSDag-Erling Smørgrav 		size_t snamelen = 0;
2274*65b390aaSDag-Erling Smørgrav 		get_cname_target(iq->response->rep->rrsets[0], &sname,
2275*65b390aaSDag-Erling Smørgrav 			&snamelen);
2276*65b390aaSDag-Erling Smørgrav 		if(snamelen && dname_subdomain_c(sname, iq->response->rep->rrsets[0]->rk.dname)) {
2277*65b390aaSDag-Erling Smørgrav 			/* DNAME to a subdomain loop; do not recurse */
2278*65b390aaSDag-Erling Smørgrav 			type = RESPONSE_TYPE_ANSWER;
2279*65b390aaSDag-Erling Smørgrav 		}
2280*65b390aaSDag-Erling Smørgrav 	}
2281b7579f77SDag-Erling Smørgrav 
2282b7579f77SDag-Erling Smørgrav 	/* handle each of the type cases */
2283b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_ANSWER) {
2284b7579f77SDag-Erling Smørgrav 		/* ANSWER type responses terminate the query algorithm,
2285b7579f77SDag-Erling Smørgrav 		 * so they sent on their */
2286b7579f77SDag-Erling Smørgrav 		if(verbosity >= VERB_DETAIL) {
2287b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "query response was %s",
2288b7579f77SDag-Erling Smørgrav 				FLAGS_GET_RCODE(iq->response->rep->flags)
2289b7579f77SDag-Erling Smørgrav 				==LDNS_RCODE_NXDOMAIN?"NXDOMAIN ANSWER":
2290b7579f77SDag-Erling Smørgrav 				(iq->response->rep->an_numrrsets?"ANSWER":
2291b7579f77SDag-Erling Smørgrav 				"nodata ANSWER"));
2292b7579f77SDag-Erling Smørgrav 		}
2293b7579f77SDag-Erling Smørgrav 		/* if qtype is DS, check we have the right level of answer,
2294b7579f77SDag-Erling Smørgrav 		 * like grandchild answer but we need the middle, reject it */
2295b7579f77SDag-Erling Smørgrav 		if(iq->qchase.qtype == LDNS_RR_TYPE_DS && !iq->dsns_point
2296b7579f77SDag-Erling Smørgrav 			&& !(iq->chase_flags&BIT_RD)
2297b7579f77SDag-Erling Smørgrav 			&& iter_ds_toolow(iq->response, iq->dp)
22988ed2b524SDag-Erling Smørgrav 			&& iter_dp_cangodown(&iq->qchase, iq->dp)) {
22998ed2b524SDag-Erling Smørgrav 			/* close down outstanding requests to be discarded */
23008ed2b524SDag-Erling Smørgrav 			outbound_list_clear(&iq->outlist);
23018ed2b524SDag-Erling Smørgrav 			iq->num_current_queries = 0;
23028ed2b524SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_detach_subs(
23038ed2b524SDag-Erling Smørgrav 				qstate->env->detach_subs));
23048ed2b524SDag-Erling Smørgrav 			(*qstate->env->detach_subs)(qstate);
23058ed2b524SDag-Erling Smørgrav 			iq->num_target_queries = 0;
2306b7579f77SDag-Erling Smørgrav 			return processDSNSFind(qstate, iq, id);
23078ed2b524SDag-Erling Smørgrav 		}
2308bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store)
23098ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &iq->response->qinfo,
2310b7579f77SDag-Erling Smørgrav 				iq->response->rep, 0, qstate->prefetch_leeway,
2311b7579f77SDag-Erling Smørgrav 				iq->dp&&iq->dp->has_parent_side_NS,
2312ff825849SDag-Erling Smørgrav 				qstate->region, qstate->query_flags);
2313b7579f77SDag-Erling Smørgrav 		/* close down outstanding requests to be discarded */
2314b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
2315b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
2316b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
2317b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
2318b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
2319b7579f77SDag-Erling Smørgrav 		iq->num_target_queries = 0;
2320b7579f77SDag-Erling Smørgrav 		if(qstate->reply)
2321b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin,
2322b7579f77SDag-Erling Smørgrav 				&qstate->reply->addr, qstate->reply->addrlen,
2323b7579f77SDag-Erling Smørgrav 				qstate->region);
232405ab2901SDag-Erling Smørgrav 		if(iq->minimisation_state != DONOT_MINIMISE_STATE) {
232505ab2901SDag-Erling Smørgrav 			if(FLAGS_GET_RCODE(iq->response->rep->flags) !=
2326bc892140SDag-Erling Smørgrav 				LDNS_RCODE_NOERROR) {
2327bc892140SDag-Erling Smørgrav 				if(qstate->env->cfg->qname_minimisation_strict)
2328bc892140SDag-Erling Smørgrav 					return final_state(iq);
2329bc892140SDag-Erling Smørgrav 				/* Best effort qname-minimisation.
2330bc892140SDag-Erling Smørgrav 				 * Stop minimising and send full query when
2331bc892140SDag-Erling Smørgrav 				 * RCODE is not NOERROR. */
233205ab2901SDag-Erling Smørgrav 				iq->minimisation_state = DONOT_MINIMISE_STATE;
2333bc892140SDag-Erling Smørgrav 			}
2334e2d15004SDag-Erling Smørgrav 			if(FLAGS_GET_RCODE(iq->response->rep->flags) ==
2335e2d15004SDag-Erling Smørgrav 				LDNS_RCODE_NXDOMAIN) {
2336e2d15004SDag-Erling Smørgrav 				/* Stop resolving when NXDOMAIN is DNSSEC
2337e2d15004SDag-Erling Smørgrav 				 * signed. Based on assumption that namservers
2338e2d15004SDag-Erling Smørgrav 				 * serving signed zones do not return NXDOMAIN
2339e2d15004SDag-Erling Smørgrav 				 * for empty-non-terminals. */
2340e2d15004SDag-Erling Smørgrav 				if(iq->dnssec_expected)
2341e2d15004SDag-Erling Smørgrav 					return final_state(iq);
2342e2d15004SDag-Erling Smørgrav 				/* Make subrequest to validate intermediate
2343e2d15004SDag-Erling Smørgrav 				 * NXDOMAIN if harden-below-nxdomain is
2344e2d15004SDag-Erling Smørgrav 				 * enabled. */
2345e2d15004SDag-Erling Smørgrav 				if(qstate->env->cfg->harden_below_nxdomain) {
2346e2d15004SDag-Erling Smørgrav 					struct module_qstate* subq = NULL;
2347e2d15004SDag-Erling Smørgrav 					log_query_info(VERB_QUERY,
2348e2d15004SDag-Erling Smørgrav 						"schedule NXDOMAIN validation:",
2349e2d15004SDag-Erling Smørgrav 						&iq->response->qinfo);
2350e2d15004SDag-Erling Smørgrav 					if(!generate_sub_request(
2351e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qname,
2352e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qname_len,
2353e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qtype,
2354e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qclass,
2355e2d15004SDag-Erling Smørgrav 						qstate, id, iq,
2356e2d15004SDag-Erling Smørgrav 						INIT_REQUEST_STATE,
2357e2d15004SDag-Erling Smørgrav 						FINISHED_STATE, &subq, 1))
2358e2d15004SDag-Erling Smørgrav 						verbose(VERB_ALGO,
2359e2d15004SDag-Erling Smørgrav 						"could not validate NXDOMAIN "
2360e2d15004SDag-Erling Smørgrav 						"response");
2361e2d15004SDag-Erling Smørgrav 				}
2362e2d15004SDag-Erling Smørgrav 			}
236305ab2901SDag-Erling Smørgrav 			return next_state(iq, QUERYTARGETS_STATE);
236405ab2901SDag-Erling Smørgrav 		}
2365b7579f77SDag-Erling Smørgrav 		return final_state(iq);
2366b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_REFERRAL) {
2367b7579f77SDag-Erling Smørgrav 		/* REFERRAL type responses get a reset of the
2368b7579f77SDag-Erling Smørgrav 		 * delegation point, and back to the QUERYTARGETS_STATE. */
2369b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was REFERRAL");
2370b7579f77SDag-Erling Smørgrav 
237109a3aaf3SDag-Erling Smørgrav 		if(!(iq->chase_flags & BIT_RD) && !iq->ratelimit_ok) {
237209a3aaf3SDag-Erling Smørgrav 			/* we have a referral, no ratelimit, we can send
237309a3aaf3SDag-Erling Smørgrav 			 * our queries to the given name */
237409a3aaf3SDag-Erling Smørgrav 			infra_ratelimit_dec(qstate->env->infra_cache,
237509a3aaf3SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
237609a3aaf3SDag-Erling Smørgrav 				*qstate->env->now);
237709a3aaf3SDag-Erling Smørgrav 		}
237809a3aaf3SDag-Erling Smørgrav 
2379b7579f77SDag-Erling Smørgrav 		/* if hardened, only store referral if we asked for it */
2380bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store &&
2381bc892140SDag-Erling Smørgrav 		(!qstate->env->cfg->harden_referral_path ||
2382b7579f77SDag-Erling Smørgrav 		    (  qstate->qinfo.qtype == LDNS_RR_TYPE_NS
2383b7579f77SDag-Erling Smørgrav 			&& (qstate->query_flags&BIT_RD)
2384b7579f77SDag-Erling Smørgrav 			&& !(qstate->query_flags&BIT_CD)
2385b7579f77SDag-Erling Smørgrav 			   /* we know that all other NS rrsets are scrubbed
2386b7579f77SDag-Erling Smørgrav 			    * away, thus on referral only one is left.
2387b7579f77SDag-Erling Smørgrav 			    * see if that equals the query name... */
2388b7579f77SDag-Erling Smørgrav 			&& ( /* auth section, but sometimes in answer section*/
2389b7579f77SDag-Erling Smørgrav 			  reply_find_rrset_section_ns(iq->response->rep,
2390b7579f77SDag-Erling Smørgrav 				iq->qchase.qname, iq->qchase.qname_len,
2391b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_NS, iq->qchase.qclass)
2392b7579f77SDag-Erling Smørgrav 			  || reply_find_rrset_section_an(iq->response->rep,
2393b7579f77SDag-Erling Smørgrav 				iq->qchase.qname, iq->qchase.qname_len,
2394b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_NS, iq->qchase.qclass)
2395b7579f77SDag-Erling Smørgrav 			  )
2396bc892140SDag-Erling Smørgrav 		    ))) {
2397b7579f77SDag-Erling Smørgrav 			/* Store the referral under the current query */
2398b7579f77SDag-Erling Smørgrav 			/* no prefetch-leeway, since its not the answer */
23998ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &iq->response->qinfo,
2400ff825849SDag-Erling Smørgrav 				iq->response->rep, 1, 0, 0, NULL, 0);
2401b7579f77SDag-Erling Smørgrav 			if(iq->store_parent_NS)
2402b7579f77SDag-Erling Smørgrav 				iter_store_parentside_NS(qstate->env,
2403b7579f77SDag-Erling Smørgrav 					iq->response->rep);
2404b7579f77SDag-Erling Smørgrav 			if(qstate->env->neg_cache)
2405b7579f77SDag-Erling Smørgrav 				val_neg_addreferral(qstate->env->neg_cache,
2406b7579f77SDag-Erling Smørgrav 					iq->response->rep, iq->dp->name);
2407b7579f77SDag-Erling Smørgrav 		}
2408b7579f77SDag-Erling Smørgrav 		/* store parent-side-in-zone-glue, if directly queried for */
2409bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store && iq->query_for_pside_glue
2410bc892140SDag-Erling Smørgrav 			&& !iq->pside_glue) {
2411b7579f77SDag-Erling Smørgrav 				iq->pside_glue = reply_find_rrset(iq->response->rep,
2412b7579f77SDag-Erling Smørgrav 					iq->qchase.qname, iq->qchase.qname_len,
2413b7579f77SDag-Erling Smørgrav 					iq->qchase.qtype, iq->qchase.qclass);
2414b7579f77SDag-Erling Smørgrav 				if(iq->pside_glue) {
2415b7579f77SDag-Erling Smørgrav 					log_rrset_key(VERB_ALGO, "found parent-side "
2416b7579f77SDag-Erling Smørgrav 						"glue", iq->pside_glue);
2417b7579f77SDag-Erling Smørgrav 					iter_store_parentside_rrset(qstate->env,
2418b7579f77SDag-Erling Smørgrav 						iq->pside_glue);
2419b7579f77SDag-Erling Smørgrav 				}
2420b7579f77SDag-Erling Smørgrav 		}
2421b7579f77SDag-Erling Smørgrav 
2422b7579f77SDag-Erling Smørgrav 		/* Reset the event state, setting the current delegation
2423b7579f77SDag-Erling Smørgrav 		 * point to the referral. */
2424b7579f77SDag-Erling Smørgrav 		iq->deleg_msg = iq->response;
2425b7579f77SDag-Erling Smørgrav 		iq->dp = delegpt_from_message(iq->response, qstate->region);
242605ab2901SDag-Erling Smørgrav 		if (qstate->env->cfg->qname_minimisation)
242705ab2901SDag-Erling Smørgrav 			iq->minimisation_state = INIT_MINIMISE_STATE;
2428b7579f77SDag-Erling Smørgrav 		if(!iq->dp)
2429b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2430b7579f77SDag-Erling Smørgrav 		if(!cache_fill_missing(qstate->env, iq->qchase.qclass,
2431b7579f77SDag-Erling Smørgrav 			qstate->region, iq->dp))
2432b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2433b7579f77SDag-Erling Smørgrav 		if(iq->store_parent_NS && query_dname_compare(iq->dp->name,
2434b7579f77SDag-Erling Smørgrav 			iq->store_parent_NS->name) == 0)
2435b7579f77SDag-Erling Smørgrav 			iter_merge_retry_counts(iq->dp, iq->store_parent_NS);
2436b7579f77SDag-Erling Smørgrav 		delegpt_log(VERB_ALGO, iq->dp);
2437b7579f77SDag-Erling Smørgrav 		/* Count this as a referral. */
2438b7579f77SDag-Erling Smørgrav 		iq->referral_count++;
2439b7579f77SDag-Erling Smørgrav 		iq->sent_count = 0;
2440b7579f77SDag-Erling Smørgrav 		/* see if the next dp is a trust anchor, or a DS was sent
2441b7579f77SDag-Erling Smørgrav 		 * along, indicating dnssec is expected for next zone */
2442b7579f77SDag-Erling Smørgrav 		iq->dnssec_expected = iter_indicates_dnssec(qstate->env,
2443b7579f77SDag-Erling Smørgrav 			iq->dp, iq->response, iq->qchase.qclass);
2444b7579f77SDag-Erling Smørgrav 		/* if dnssec, validating then also fetch the key for the DS */
2445b7579f77SDag-Erling Smørgrav 		if(iq->dnssec_expected && qstate->env->cfg->prefetch_key &&
2446b7579f77SDag-Erling Smørgrav 			!(qstate->query_flags&BIT_CD))
2447b7579f77SDag-Erling Smørgrav 			generate_dnskey_prefetch(qstate, iq, id);
2448b7579f77SDag-Erling Smørgrav 
2449b7579f77SDag-Erling Smørgrav 		/* spawn off NS and addr to auth servers for the NS we just
2450b7579f77SDag-Erling Smørgrav 		 * got in the referral. This gets authoritative answer
2451b7579f77SDag-Erling Smørgrav 		 * (answer section trust level) rrset.
2452b7579f77SDag-Erling Smørgrav 		 * right after, we detach the subs, answer goes to cache. */
2453b7579f77SDag-Erling Smørgrav 		if(qstate->env->cfg->harden_referral_path)
2454b7579f77SDag-Erling Smørgrav 			generate_ns_check(qstate, iq, id);
2455b7579f77SDag-Erling Smørgrav 
2456b7579f77SDag-Erling Smørgrav 		/* stop current outstanding queries.
2457b7579f77SDag-Erling Smørgrav 		 * FIXME: should the outstanding queries be waited for and
2458b7579f77SDag-Erling Smørgrav 		 * handled? Say by a subquery that inherits the outbound_entry.
2459b7579f77SDag-Erling Smørgrav 		 */
2460b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
2461b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
2462b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
2463b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
2464b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
2465b7579f77SDag-Erling Smørgrav 		iq->num_target_queries = 0;
2466b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "cleared outbound list for next round");
2467b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2468b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_CNAME) {
2469b7579f77SDag-Erling Smørgrav 		uint8_t* sname = NULL;
2470b7579f77SDag-Erling Smørgrav 		size_t snamelen = 0;
2471b7579f77SDag-Erling Smørgrav 		/* CNAME type responses get a query restart (i.e., get a
2472b7579f77SDag-Erling Smørgrav 		 * reset of the query state and go back to INIT_REQUEST_STATE).
2473b7579f77SDag-Erling Smørgrav 		 */
2474b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was CNAME");
2475b7579f77SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO)
2476b7579f77SDag-Erling Smørgrav 			log_dns_msg("cname msg", &iq->response->qinfo,
2477b7579f77SDag-Erling Smørgrav 				iq->response->rep);
2478b7579f77SDag-Erling Smørgrav 		/* if qtype is DS, check we have the right level of answer,
2479b7579f77SDag-Erling Smørgrav 		 * like grandchild answer but we need the middle, reject it */
2480b7579f77SDag-Erling Smørgrav 		if(iq->qchase.qtype == LDNS_RR_TYPE_DS && !iq->dsns_point
2481b7579f77SDag-Erling Smørgrav 			&& !(iq->chase_flags&BIT_RD)
2482b7579f77SDag-Erling Smørgrav 			&& iter_ds_toolow(iq->response, iq->dp)
24838ed2b524SDag-Erling Smørgrav 			&& iter_dp_cangodown(&iq->qchase, iq->dp)) {
24848ed2b524SDag-Erling Smørgrav 			outbound_list_clear(&iq->outlist);
24858ed2b524SDag-Erling Smørgrav 			iq->num_current_queries = 0;
24868ed2b524SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_detach_subs(
24878ed2b524SDag-Erling Smørgrav 				qstate->env->detach_subs));
24888ed2b524SDag-Erling Smørgrav 			(*qstate->env->detach_subs)(qstate);
24898ed2b524SDag-Erling Smørgrav 			iq->num_target_queries = 0;
2490b7579f77SDag-Erling Smørgrav 			return processDSNSFind(qstate, iq, id);
24918ed2b524SDag-Erling Smørgrav 		}
2492b7579f77SDag-Erling Smørgrav 		/* Process the CNAME response. */
2493b7579f77SDag-Erling Smørgrav 		if(!handle_cname_response(qstate, iq, iq->response,
2494b7579f77SDag-Erling Smørgrav 			&sname, &snamelen))
2495b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2496b7579f77SDag-Erling Smørgrav 		/* cache the CNAME response under the current query */
2497b7579f77SDag-Erling Smørgrav 		/* NOTE : set referral=1, so that rrsets get stored but not
2498b7579f77SDag-Erling Smørgrav 		 * the partial query answer (CNAME only). */
2499b7579f77SDag-Erling Smørgrav 		/* prefetchleeway applied because this updates answer parts */
2500bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store)
25018ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &iq->response->qinfo,
2502b7579f77SDag-Erling Smørgrav 				iq->response->rep, 1, qstate->prefetch_leeway,
2503ff825849SDag-Erling Smørgrav 				iq->dp&&iq->dp->has_parent_side_NS, NULL,
2504ff825849SDag-Erling Smørgrav 				qstate->query_flags);
2505b7579f77SDag-Erling Smørgrav 		/* set the current request's qname to the new value. */
2506b7579f77SDag-Erling Smørgrav 		iq->qchase.qname = sname;
2507b7579f77SDag-Erling Smørgrav 		iq->qchase.qname_len = snamelen;
250805ab2901SDag-Erling Smørgrav 		if (qstate->env->cfg->qname_minimisation)
250905ab2901SDag-Erling Smørgrav 			iq->minimisation_state = INIT_MINIMISE_STATE;
2510b7579f77SDag-Erling Smørgrav 		/* Clear the query state, since this is a query restart. */
2511b7579f77SDag-Erling Smørgrav 		iq->deleg_msg = NULL;
2512b7579f77SDag-Erling Smørgrav 		iq->dp = NULL;
2513b7579f77SDag-Erling Smørgrav 		iq->dsns_point = NULL;
2514b7579f77SDag-Erling Smørgrav 		/* Note the query restart. */
2515b7579f77SDag-Erling Smørgrav 		iq->query_restart_count++;
2516b7579f77SDag-Erling Smørgrav 		iq->sent_count = 0;
2517b7579f77SDag-Erling Smørgrav 
2518b7579f77SDag-Erling Smørgrav 		/* stop current outstanding queries.
2519b7579f77SDag-Erling Smørgrav 		 * FIXME: should the outstanding queries be waited for and
2520b7579f77SDag-Erling Smørgrav 		 * handled? Say by a subquery that inherits the outbound_entry.
2521b7579f77SDag-Erling Smørgrav 		 */
2522b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
2523b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
2524b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
2525b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
2526b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
2527b7579f77SDag-Erling Smørgrav 		iq->num_target_queries = 0;
2528b7579f77SDag-Erling Smørgrav 		if(qstate->reply)
2529b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin,
2530b7579f77SDag-Erling Smørgrav 				&qstate->reply->addr, qstate->reply->addrlen,
2531b7579f77SDag-Erling Smørgrav 				qstate->region);
2532b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "cleared outbound list for query restart");
2533b7579f77SDag-Erling Smørgrav 		/* go to INIT_REQUEST_STATE for new qname. */
2534b7579f77SDag-Erling Smørgrav 		return next_state(iq, INIT_REQUEST_STATE);
2535b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_LAME) {
2536b7579f77SDag-Erling Smørgrav 		/* Cache the LAMEness. */
2537b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was %sLAME",
2538b7579f77SDag-Erling Smørgrav 			dnsseclame?"DNSSEC ":"");
2539b7579f77SDag-Erling Smørgrav 		if(!dname_subdomain_c(iq->qchase.qname, iq->dp->name)) {
2540b7579f77SDag-Erling Smørgrav 			log_err("mark lame: mismatch in qname and dpname");
2541b7579f77SDag-Erling Smørgrav 			/* throwaway this reply below */
2542b7579f77SDag-Erling Smørgrav 		} else if(qstate->reply) {
2543b7579f77SDag-Erling Smørgrav 			/* need addr for lameness cache, but we may have
2544b7579f77SDag-Erling Smørgrav 			 * gotten this from cache, so test to be sure */
2545b7579f77SDag-Erling Smørgrav 			if(!infra_set_lame(qstate->env->infra_cache,
2546b7579f77SDag-Erling Smørgrav 				&qstate->reply->addr, qstate->reply->addrlen,
2547b7579f77SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
2548b7579f77SDag-Erling Smørgrav 				*qstate->env->now, dnsseclame, 0,
2549b7579f77SDag-Erling Smørgrav 				iq->qchase.qtype))
2550b7579f77SDag-Erling Smørgrav 				log_err("mark host lame: out of memory");
255117d15b25SDag-Erling Smørgrav 		}
2552b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_REC_LAME) {
2553b7579f77SDag-Erling Smørgrav 		/* Cache the LAMEness. */
2554b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response REC_LAME: "
2555b7579f77SDag-Erling Smørgrav 			"recursive but not authoritative server");
2556b7579f77SDag-Erling Smørgrav 		if(!dname_subdomain_c(iq->qchase.qname, iq->dp->name)) {
2557b7579f77SDag-Erling Smørgrav 			log_err("mark rec_lame: mismatch in qname and dpname");
2558b7579f77SDag-Erling Smørgrav 			/* throwaway this reply below */
2559b7579f77SDag-Erling Smørgrav 		} else if(qstate->reply) {
2560b7579f77SDag-Erling Smørgrav 			/* need addr for lameness cache, but we may have
2561b7579f77SDag-Erling Smørgrav 			 * gotten this from cache, so test to be sure */
2562b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "mark as REC_LAME");
2563b7579f77SDag-Erling Smørgrav 			if(!infra_set_lame(qstate->env->infra_cache,
2564b7579f77SDag-Erling Smørgrav 				&qstate->reply->addr, qstate->reply->addrlen,
2565b7579f77SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
2566b7579f77SDag-Erling Smørgrav 				*qstate->env->now, 0, 1, iq->qchase.qtype))
2567b7579f77SDag-Erling Smørgrav 				log_err("mark host lame: out of memory");
2568b7579f77SDag-Erling Smørgrav 		}
2569b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_THROWAWAY) {
2570b7579f77SDag-Erling Smørgrav 		/* LAME and THROWAWAY responses are handled the same way.
2571b7579f77SDag-Erling Smørgrav 		 * In this case, the event is just sent directly back to
2572b7579f77SDag-Erling Smørgrav 		 * the QUERYTARGETS_STATE without resetting anything,
2573b7579f77SDag-Erling Smørgrav 		 * because, clearly, the next target must be tried. */
2574b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was THROWAWAY");
2575b7579f77SDag-Erling Smørgrav 	} else {
2576b7579f77SDag-Erling Smørgrav 		log_warn("A query response came back with an unknown type: %d",
2577b7579f77SDag-Erling Smørgrav 			(int)type);
2578b7579f77SDag-Erling Smørgrav 	}
2579b7579f77SDag-Erling Smørgrav 
2580b7579f77SDag-Erling Smørgrav 	/* LAME, THROWAWAY and "unknown" all end up here.
2581b7579f77SDag-Erling Smørgrav 	 * Recycle to the QUERYTARGETS state to hopefully try a
2582b7579f77SDag-Erling Smørgrav 	 * different target. */
2583bc892140SDag-Erling Smørgrav 	if (qstate->env->cfg->qname_minimisation &&
2584bc892140SDag-Erling Smørgrav 		!qstate->env->cfg->qname_minimisation_strict)
258505ab2901SDag-Erling Smørgrav 		iq->minimisation_state = DONOT_MINIMISE_STATE;
2586b7579f77SDag-Erling Smørgrav 	return next_state(iq, QUERYTARGETS_STATE);
2587b7579f77SDag-Erling Smørgrav }
2588b7579f77SDag-Erling Smørgrav 
2589b7579f77SDag-Erling Smørgrav /**
2590ff825849SDag-Erling Smørgrav  * Return priming query results to interested super querystates.
2591b7579f77SDag-Erling Smørgrav  *
2592b7579f77SDag-Erling Smørgrav  * Sets the delegation point and delegation message (not nonRD queries).
2593b7579f77SDag-Erling Smørgrav  * This is a callback from walk_supers.
2594b7579f77SDag-Erling Smørgrav  *
2595b7579f77SDag-Erling Smørgrav  * @param qstate: priming query state that finished.
2596b7579f77SDag-Erling Smørgrav  * @param id: module id.
2597b7579f77SDag-Erling Smørgrav  * @param forq: the qstate for which priming has been done.
2598b7579f77SDag-Erling Smørgrav  */
2599b7579f77SDag-Erling Smørgrav static void
2600b7579f77SDag-Erling Smørgrav prime_supers(struct module_qstate* qstate, int id, struct module_qstate* forq)
2601b7579f77SDag-Erling Smørgrav {
2602b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
2603b7579f77SDag-Erling Smørgrav 	struct delegpt* dp = NULL;
2604b7579f77SDag-Erling Smørgrav 
2605b7579f77SDag-Erling Smørgrav 	log_assert(qstate->is_priming || foriq->wait_priming_stub);
2606b7579f77SDag-Erling Smørgrav 	log_assert(qstate->return_rcode == LDNS_RCODE_NOERROR);
2607b7579f77SDag-Erling Smørgrav 	/* Convert our response to a delegation point */
2608b7579f77SDag-Erling Smørgrav 	dp = delegpt_from_message(qstate->return_msg, forq->region);
2609b7579f77SDag-Erling Smørgrav 	if(!dp) {
2610b7579f77SDag-Erling Smørgrav 		/* if there is no convertable delegation point, then
2611b7579f77SDag-Erling Smørgrav 		 * the ANSWER type was (presumably) a negative answer. */
2612b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "prime response was not a positive "
2613b7579f77SDag-Erling Smørgrav 			"ANSWER; failing");
2614b7579f77SDag-Erling Smørgrav 		foriq->dp = NULL;
2615b7579f77SDag-Erling Smørgrav 		foriq->state = QUERYTARGETS_STATE;
2616b7579f77SDag-Erling Smørgrav 		return;
2617b7579f77SDag-Erling Smørgrav 	}
2618b7579f77SDag-Erling Smørgrav 
2619b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_DETAIL, "priming successful for", &qstate->qinfo);
2620b7579f77SDag-Erling Smørgrav 	delegpt_log(VERB_ALGO, dp);
2621b7579f77SDag-Erling Smørgrav 	foriq->dp = dp;
2622b7579f77SDag-Erling Smørgrav 	foriq->deleg_msg = dns_copy_msg(qstate->return_msg, forq->region);
2623b7579f77SDag-Erling Smørgrav 	if(!foriq->deleg_msg) {
2624b7579f77SDag-Erling Smørgrav 		log_err("copy prime response: out of memory");
2625b7579f77SDag-Erling Smørgrav 		foriq->dp = NULL;
2626b7579f77SDag-Erling Smørgrav 		foriq->state = QUERYTARGETS_STATE;
2627b7579f77SDag-Erling Smørgrav 		return;
2628b7579f77SDag-Erling Smørgrav 	}
2629b7579f77SDag-Erling Smørgrav 
2630b7579f77SDag-Erling Smørgrav 	/* root priming responses go to init stage 2, priming stub
2631b7579f77SDag-Erling Smørgrav 	 * responses to to stage 3. */
2632b7579f77SDag-Erling Smørgrav 	if(foriq->wait_priming_stub) {
2633b7579f77SDag-Erling Smørgrav 		foriq->state = INIT_REQUEST_3_STATE;
2634b7579f77SDag-Erling Smørgrav 		foriq->wait_priming_stub = 0;
2635b7579f77SDag-Erling Smørgrav 	} else	foriq->state = INIT_REQUEST_2_STATE;
2636b7579f77SDag-Erling Smørgrav 	/* because we are finished, the parent will be reactivated */
2637b7579f77SDag-Erling Smørgrav }
2638b7579f77SDag-Erling Smørgrav 
2639b7579f77SDag-Erling Smørgrav /**
2640b7579f77SDag-Erling Smørgrav  * This handles the response to a priming query. This is used to handle both
2641b7579f77SDag-Erling Smørgrav  * root and stub priming responses. This is basically the equivalent of the
2642b7579f77SDag-Erling Smørgrav  * QUERY_RESP_STATE, but will not handle CNAME responses and will treat
2643b7579f77SDag-Erling Smørgrav  * REFERRALs as ANSWERS. It will also update and reactivate the originating
2644b7579f77SDag-Erling Smørgrav  * event.
2645b7579f77SDag-Erling Smørgrav  *
2646b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2647b7579f77SDag-Erling Smørgrav  * @param id: module id.
2648b7579f77SDag-Erling Smørgrav  * @return true if the event needs more immediate processing, false if not.
2649b7579f77SDag-Erling Smørgrav  *         This state always returns false.
2650b7579f77SDag-Erling Smørgrav  */
2651b7579f77SDag-Erling Smørgrav static int
2652b7579f77SDag-Erling Smørgrav processPrimeResponse(struct module_qstate* qstate, int id)
2653b7579f77SDag-Erling Smørgrav {
2654b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
2655b7579f77SDag-Erling Smørgrav 	enum response_type type;
2656b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags &= ~(BIT_RD|BIT_RA); /* ignore rec-lame */
2657b7579f77SDag-Erling Smørgrav 	type = response_type_from_server(
2658b7579f77SDag-Erling Smørgrav 		(int)((iq->chase_flags&BIT_RD) || iq->chase_to_rd),
2659b7579f77SDag-Erling Smørgrav 		iq->response, &iq->qchase, iq->dp);
2660b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_ANSWER) {
2661b7579f77SDag-Erling Smørgrav 		qstate->return_rcode = LDNS_RCODE_NOERROR;
2662b7579f77SDag-Erling Smørgrav 		qstate->return_msg = iq->response;
2663b7579f77SDag-Erling Smørgrav 	} else {
2664b7579f77SDag-Erling Smørgrav 		qstate->return_rcode = LDNS_RCODE_SERVFAIL;
2665b7579f77SDag-Erling Smørgrav 		qstate->return_msg = NULL;
2666b7579f77SDag-Erling Smørgrav 	}
2667b7579f77SDag-Erling Smørgrav 
2668b7579f77SDag-Erling Smørgrav 	/* validate the root or stub after priming (if enabled).
2669b7579f77SDag-Erling Smørgrav 	 * This is the same query as the prime query, but with validation.
2670b7579f77SDag-Erling Smørgrav 	 * Now that we are primed, the additional queries that validation
2671b7579f77SDag-Erling Smørgrav 	 * may need can be resolved, such as DLV. */
2672b7579f77SDag-Erling Smørgrav 	if(qstate->env->cfg->harden_referral_path) {
2673b7579f77SDag-Erling Smørgrav 		struct module_qstate* subq = NULL;
2674b7579f77SDag-Erling Smørgrav 		log_nametypeclass(VERB_ALGO, "schedule prime validation",
2675b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qname, qstate->qinfo.qtype,
2676b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qclass);
2677b7579f77SDag-Erling Smørgrav 		if(!generate_sub_request(qstate->qinfo.qname,
2678b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qname_len, qstate->qinfo.qtype,
2679b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qclass, qstate, id, iq,
2680b7579f77SDag-Erling Smørgrav 			INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1)) {
2681b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "could not generate prime check");
2682b7579f77SDag-Erling Smørgrav 		}
2683b7579f77SDag-Erling Smørgrav 		generate_a_aaaa_check(qstate, iq, id);
2684b7579f77SDag-Erling Smørgrav 	}
2685b7579f77SDag-Erling Smørgrav 
2686b7579f77SDag-Erling Smørgrav 	/* This event is finished. */
2687b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_finished;
2688b7579f77SDag-Erling Smørgrav 	return 0;
2689b7579f77SDag-Erling Smørgrav }
2690b7579f77SDag-Erling Smørgrav 
2691b7579f77SDag-Erling Smørgrav /**
2692b7579f77SDag-Erling Smørgrav  * Do final processing on responses to target queries. Events reach this
2693b7579f77SDag-Erling Smørgrav  * state after the iterative resolution algorithm terminates. This state is
2694b7579f77SDag-Erling Smørgrav  * responsible for reactiving the original event, and housekeeping related
2695b7579f77SDag-Erling Smørgrav  * to received target responses (caching, updating the current delegation
2696b7579f77SDag-Erling Smørgrav  * point, etc).
2697b7579f77SDag-Erling Smørgrav  * Callback from walk_supers for every super state that is interested in
2698b7579f77SDag-Erling Smørgrav  * the results from this query.
2699b7579f77SDag-Erling Smørgrav  *
2700b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2701b7579f77SDag-Erling Smørgrav  * @param id: module id.
2702b7579f77SDag-Erling Smørgrav  * @param forq: super query state.
2703b7579f77SDag-Erling Smørgrav  */
2704b7579f77SDag-Erling Smørgrav static void
2705b7579f77SDag-Erling Smørgrav processTargetResponse(struct module_qstate* qstate, int id,
2706b7579f77SDag-Erling Smørgrav 	struct module_qstate* forq)
2707b7579f77SDag-Erling Smørgrav {
2708b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
2709b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
2710b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset;
2711b7579f77SDag-Erling Smørgrav 	struct delegpt_ns* dpns;
2712b7579f77SDag-Erling Smørgrav 	log_assert(qstate->return_rcode == LDNS_RCODE_NOERROR);
2713b7579f77SDag-Erling Smørgrav 
2714b7579f77SDag-Erling Smørgrav 	foriq->state = QUERYTARGETS_STATE;
2715b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processTargetResponse", &qstate->qinfo);
2716b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processTargetResponse super", &forq->qinfo);
2717b7579f77SDag-Erling Smørgrav 
2718b5663de9SDag-Erling Smørgrav 	/* Tell the originating event that this target query has finished
2719b5663de9SDag-Erling Smørgrav 	 * (regardless if it succeeded or not). */
2720b5663de9SDag-Erling Smørgrav 	foriq->num_target_queries--;
2721b5663de9SDag-Erling Smørgrav 
2722b7579f77SDag-Erling Smørgrav 	/* check to see if parent event is still interested (in orig name).  */
2723b7579f77SDag-Erling Smørgrav 	if(!foriq->dp) {
2724b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "subq: parent not interested, was reset");
2725b7579f77SDag-Erling Smørgrav 		return; /* not interested anymore */
2726b7579f77SDag-Erling Smørgrav 	}
2727b7579f77SDag-Erling Smørgrav 	dpns = delegpt_find_ns(foriq->dp, qstate->qinfo.qname,
2728b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qname_len);
2729b7579f77SDag-Erling Smørgrav 	if(!dpns) {
2730b7579f77SDag-Erling Smørgrav 		/* If not interested, just stop processing this event */
2731b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "subq: parent not interested anymore");
2732b7579f77SDag-Erling Smørgrav 		/* could be because parent was jostled out of the cache,
2733b7579f77SDag-Erling Smørgrav 		   and a new identical query arrived, that does not want it*/
2734b7579f77SDag-Erling Smørgrav 		return;
2735b7579f77SDag-Erling Smørgrav 	}
2736b7579f77SDag-Erling Smørgrav 
2737b7579f77SDag-Erling Smørgrav 	/* if iq->query_for_pside_glue then add the pside_glue (marked lame) */
2738b7579f77SDag-Erling Smørgrav 	if(iq->pside_glue) {
2739b7579f77SDag-Erling Smørgrav 		/* if the pside_glue is NULL, then it could not be found,
2740b7579f77SDag-Erling Smørgrav 		 * the done_pside is already set when created and a cache
2741b7579f77SDag-Erling Smørgrav 		 * entry created in processFinished so nothing to do here */
2742b7579f77SDag-Erling Smørgrav 		log_rrset_key(VERB_ALGO, "add parentside glue to dp",
2743b7579f77SDag-Erling Smørgrav 			iq->pside_glue);
2744b7579f77SDag-Erling Smørgrav 		if(!delegpt_add_rrset(foriq->dp, forq->region,
2745b7579f77SDag-Erling Smørgrav 			iq->pside_glue, 1))
2746b7579f77SDag-Erling Smørgrav 			log_err("out of memory adding pside glue");
2747b7579f77SDag-Erling Smørgrav 	}
2748b7579f77SDag-Erling Smørgrav 
2749b7579f77SDag-Erling Smørgrav 	/* This response is relevant to the current query, so we
2750b7579f77SDag-Erling Smørgrav 	 * add (attempt to add, anyway) this target(s) and reactivate
2751b7579f77SDag-Erling Smørgrav 	 * the original event.
2752b7579f77SDag-Erling Smørgrav 	 * NOTE: we could only look for the AnswerRRset if the
2753b7579f77SDag-Erling Smørgrav 	 * response type was ANSWER. */
2754b7579f77SDag-Erling Smørgrav 	rrset = reply_find_answer_rrset(&iq->qchase, qstate->return_msg->rep);
2755b7579f77SDag-Erling Smørgrav 	if(rrset) {
2756b7579f77SDag-Erling Smørgrav 		/* if CNAMEs have been followed - add new NS to delegpt. */
2757b7579f77SDag-Erling Smørgrav 		/* BTW. RFC 1918 says NS should not have got CNAMEs. Robust. */
2758b7579f77SDag-Erling Smørgrav 		if(!delegpt_find_ns(foriq->dp, rrset->rk.dname,
2759b7579f77SDag-Erling Smørgrav 			rrset->rk.dname_len)) {
2760b7579f77SDag-Erling Smørgrav 			/* if dpns->lame then set newcname ns lame too */
2761b7579f77SDag-Erling Smørgrav 			if(!delegpt_add_ns(foriq->dp, forq->region,
276217d15b25SDag-Erling Smørgrav 				rrset->rk.dname, dpns->lame))
2763b7579f77SDag-Erling Smørgrav 				log_err("out of memory adding cnamed-ns");
2764b7579f77SDag-Erling Smørgrav 		}
2765b7579f77SDag-Erling Smørgrav 		/* if dpns->lame then set the address(es) lame too */
2766b7579f77SDag-Erling Smørgrav 		if(!delegpt_add_rrset(foriq->dp, forq->region, rrset,
276717d15b25SDag-Erling Smørgrav 			dpns->lame))
2768b7579f77SDag-Erling Smørgrav 			log_err("out of memory adding targets");
2769b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "added target response");
2770b7579f77SDag-Erling Smørgrav 		delegpt_log(VERB_ALGO, foriq->dp);
2771b7579f77SDag-Erling Smørgrav 	} else {
2772b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "iterator TargetResponse failed");
2773b7579f77SDag-Erling Smørgrav 		dpns->resolved = 1; /* fail the target */
2774b7579f77SDag-Erling Smørgrav 	}
2775b7579f77SDag-Erling Smørgrav }
2776b7579f77SDag-Erling Smørgrav 
2777b7579f77SDag-Erling Smørgrav /**
2778b7579f77SDag-Erling Smørgrav  * Process response for DS NS Find queries, that attempt to find the delegation
2779b7579f77SDag-Erling Smørgrav  * point where we ask the DS query from.
2780b7579f77SDag-Erling Smørgrav  *
2781b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2782b7579f77SDag-Erling Smørgrav  * @param id: module id.
2783b7579f77SDag-Erling Smørgrav  * @param forq: super query state.
2784b7579f77SDag-Erling Smørgrav  */
2785b7579f77SDag-Erling Smørgrav static void
2786b7579f77SDag-Erling Smørgrav processDSNSResponse(struct module_qstate* qstate, int id,
2787b7579f77SDag-Erling Smørgrav 	struct module_qstate* forq)
2788b7579f77SDag-Erling Smørgrav {
2789b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
2790b7579f77SDag-Erling Smørgrav 
2791b7579f77SDag-Erling Smørgrav 	/* if the finished (iq->response) query has no NS set: continue
2792b7579f77SDag-Erling Smørgrav 	 * up to look for the right dp; nothing to change, do DPNSstate */
2793b7579f77SDag-Erling Smørgrav 	if(qstate->return_rcode != LDNS_RCODE_NOERROR)
2794b7579f77SDag-Erling Smørgrav 		return; /* seek further */
2795b7579f77SDag-Erling Smørgrav 	/* find the NS RRset (without allowing CNAMEs) */
2796b7579f77SDag-Erling Smørgrav 	if(!reply_find_rrset(qstate->return_msg->rep, qstate->qinfo.qname,
2797b7579f77SDag-Erling Smørgrav 		qstate->qinfo.qname_len, LDNS_RR_TYPE_NS,
2798b7579f77SDag-Erling Smørgrav 		qstate->qinfo.qclass)){
2799b7579f77SDag-Erling Smørgrav 		return; /* seek further */
2800b7579f77SDag-Erling Smørgrav 	}
2801b7579f77SDag-Erling Smørgrav 
2802b7579f77SDag-Erling Smørgrav 	/* else, store as DP and continue at querytargets */
2803b7579f77SDag-Erling Smørgrav 	foriq->state = QUERYTARGETS_STATE;
2804b7579f77SDag-Erling Smørgrav 	foriq->dp = delegpt_from_message(qstate->return_msg, forq->region);
2805b7579f77SDag-Erling Smørgrav 	if(!foriq->dp) {
2806b7579f77SDag-Erling Smørgrav 		log_err("out of memory in dsns dp alloc");
2807b7579f77SDag-Erling Smørgrav 		return; /* dp==NULL in QUERYTARGETS makes SERVFAIL */
2808b7579f77SDag-Erling Smørgrav 	}
2809b7579f77SDag-Erling Smørgrav 	/* success, go query the querytargets in the new dp (and go down) */
2810b7579f77SDag-Erling Smørgrav }
2811b7579f77SDag-Erling Smørgrav 
2812b7579f77SDag-Erling Smørgrav /**
2813b7579f77SDag-Erling Smørgrav  * Process response for qclass=ANY queries for a particular class.
2814b7579f77SDag-Erling Smørgrav  * Append to result or error-exit.
2815b7579f77SDag-Erling Smørgrav  *
2816b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2817b7579f77SDag-Erling Smørgrav  * @param id: module id.
2818b7579f77SDag-Erling Smørgrav  * @param forq: super query state.
2819b7579f77SDag-Erling Smørgrav  */
2820b7579f77SDag-Erling Smørgrav static void
2821b7579f77SDag-Erling Smørgrav processClassResponse(struct module_qstate* qstate, int id,
2822b7579f77SDag-Erling Smørgrav 	struct module_qstate* forq)
2823b7579f77SDag-Erling Smørgrav {
2824b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
2825b7579f77SDag-Erling Smørgrav 	struct dns_msg* from = qstate->return_msg;
2826b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processClassResponse", &qstate->qinfo);
2827b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processClassResponse super", &forq->qinfo);
2828b7579f77SDag-Erling Smørgrav 	if(qstate->return_rcode != LDNS_RCODE_NOERROR) {
2829b7579f77SDag-Erling Smørgrav 		/* cause servfail for qclass ANY query */
2830b7579f77SDag-Erling Smørgrav 		foriq->response = NULL;
2831b7579f77SDag-Erling Smørgrav 		foriq->state = FINISHED_STATE;
2832b7579f77SDag-Erling Smørgrav 		return;
2833b7579f77SDag-Erling Smørgrav 	}
2834b7579f77SDag-Erling Smørgrav 	/* append result */
2835b7579f77SDag-Erling Smørgrav 	if(!foriq->response) {
2836b7579f77SDag-Erling Smørgrav 		/* allocate the response: copy RCODE, sec_state */
2837b7579f77SDag-Erling Smørgrav 		foriq->response = dns_copy_msg(from, forq->region);
2838b7579f77SDag-Erling Smørgrav 		if(!foriq->response) {
2839b7579f77SDag-Erling Smørgrav 			log_err("malloc failed for qclass ANY response");
2840b7579f77SDag-Erling Smørgrav 			foriq->state = FINISHED_STATE;
2841b7579f77SDag-Erling Smørgrav 			return;
2842b7579f77SDag-Erling Smørgrav 		}
2843b7579f77SDag-Erling Smørgrav 		foriq->response->qinfo.qclass = forq->qinfo.qclass;
2844b7579f77SDag-Erling Smørgrav 		/* qclass ANY does not receive the AA flag on replies */
2845b7579f77SDag-Erling Smørgrav 		foriq->response->rep->authoritative = 0;
2846b7579f77SDag-Erling Smørgrav 	} else {
2847b7579f77SDag-Erling Smørgrav 		struct dns_msg* to = foriq->response;
2848b7579f77SDag-Erling Smørgrav 		/* add _from_ this response _to_ existing collection */
2849b7579f77SDag-Erling Smørgrav 		/* if there are records, copy RCODE */
2850b7579f77SDag-Erling Smørgrav 		/* lower sec_state if this message is lower */
2851b7579f77SDag-Erling Smørgrav 		if(from->rep->rrset_count != 0) {
2852b7579f77SDag-Erling Smørgrav 			size_t n = from->rep->rrset_count+to->rep->rrset_count;
2853b7579f77SDag-Erling Smørgrav 			struct ub_packed_rrset_key** dest, **d;
2854b7579f77SDag-Erling Smørgrav 			/* copy appropriate rcode */
2855b7579f77SDag-Erling Smørgrav 			to->rep->flags = from->rep->flags;
2856b7579f77SDag-Erling Smørgrav 			/* copy rrsets */
285709a3aaf3SDag-Erling Smørgrav 			if(from->rep->rrset_count > RR_COUNT_MAX ||
285809a3aaf3SDag-Erling Smørgrav 				to->rep->rrset_count > RR_COUNT_MAX) {
285909a3aaf3SDag-Erling Smørgrav 				log_err("malloc failed (too many rrsets) in collect ANY");
286009a3aaf3SDag-Erling Smørgrav 				foriq->state = FINISHED_STATE;
286109a3aaf3SDag-Erling Smørgrav 				return; /* integer overflow protection */
286209a3aaf3SDag-Erling Smørgrav 			}
2863b7579f77SDag-Erling Smørgrav 			dest = regional_alloc(forq->region, sizeof(dest[0])*n);
2864b7579f77SDag-Erling Smørgrav 			if(!dest) {
2865b7579f77SDag-Erling Smørgrav 				log_err("malloc failed in collect ANY");
2866b7579f77SDag-Erling Smørgrav 				foriq->state = FINISHED_STATE;
2867b7579f77SDag-Erling Smørgrav 				return;
2868b7579f77SDag-Erling Smørgrav 			}
2869b7579f77SDag-Erling Smørgrav 			d = dest;
2870b7579f77SDag-Erling Smørgrav 			/* copy AN */
2871b7579f77SDag-Erling Smørgrav 			memcpy(dest, to->rep->rrsets, to->rep->an_numrrsets
2872b7579f77SDag-Erling Smørgrav 				* sizeof(dest[0]));
2873b7579f77SDag-Erling Smørgrav 			dest += to->rep->an_numrrsets;
2874b7579f77SDag-Erling Smørgrav 			memcpy(dest, from->rep->rrsets, from->rep->an_numrrsets
2875b7579f77SDag-Erling Smørgrav 				* sizeof(dest[0]));
2876b7579f77SDag-Erling Smørgrav 			dest += from->rep->an_numrrsets;
2877b7579f77SDag-Erling Smørgrav 			/* copy NS */
2878b7579f77SDag-Erling Smørgrav 			memcpy(dest, to->rep->rrsets+to->rep->an_numrrsets,
2879b7579f77SDag-Erling Smørgrav 				to->rep->ns_numrrsets * sizeof(dest[0]));
2880b7579f77SDag-Erling Smørgrav 			dest += to->rep->ns_numrrsets;
2881b7579f77SDag-Erling Smørgrav 			memcpy(dest, from->rep->rrsets+from->rep->an_numrrsets,
2882b7579f77SDag-Erling Smørgrav 				from->rep->ns_numrrsets * sizeof(dest[0]));
2883b7579f77SDag-Erling Smørgrav 			dest += from->rep->ns_numrrsets;
2884b7579f77SDag-Erling Smørgrav 			/* copy AR */
2885b7579f77SDag-Erling Smørgrav 			memcpy(dest, to->rep->rrsets+to->rep->an_numrrsets+
2886b7579f77SDag-Erling Smørgrav 				to->rep->ns_numrrsets,
2887b7579f77SDag-Erling Smørgrav 				to->rep->ar_numrrsets * sizeof(dest[0]));
2888b7579f77SDag-Erling Smørgrav 			dest += to->rep->ar_numrrsets;
2889b7579f77SDag-Erling Smørgrav 			memcpy(dest, from->rep->rrsets+from->rep->an_numrrsets+
2890b7579f77SDag-Erling Smørgrav 				from->rep->ns_numrrsets,
2891b7579f77SDag-Erling Smørgrav 				from->rep->ar_numrrsets * sizeof(dest[0]));
2892b7579f77SDag-Erling Smørgrav 			/* update counts */
2893b7579f77SDag-Erling Smørgrav 			to->rep->rrsets = d;
2894b7579f77SDag-Erling Smørgrav 			to->rep->an_numrrsets += from->rep->an_numrrsets;
2895b7579f77SDag-Erling Smørgrav 			to->rep->ns_numrrsets += from->rep->ns_numrrsets;
2896b7579f77SDag-Erling Smørgrav 			to->rep->ar_numrrsets += from->rep->ar_numrrsets;
2897b7579f77SDag-Erling Smørgrav 			to->rep->rrset_count = n;
2898b7579f77SDag-Erling Smørgrav 		}
2899b7579f77SDag-Erling Smørgrav 		if(from->rep->security < to->rep->security) /* lowest sec */
2900b7579f77SDag-Erling Smørgrav 			to->rep->security = from->rep->security;
2901b7579f77SDag-Erling Smørgrav 		if(from->rep->qdcount != 0) /* insert qd if appropriate */
2902b7579f77SDag-Erling Smørgrav 			to->rep->qdcount = from->rep->qdcount;
2903b7579f77SDag-Erling Smørgrav 		if(from->rep->ttl < to->rep->ttl) /* use smallest TTL */
2904b7579f77SDag-Erling Smørgrav 			to->rep->ttl = from->rep->ttl;
2905b7579f77SDag-Erling Smørgrav 		if(from->rep->prefetch_ttl < to->rep->prefetch_ttl)
2906b7579f77SDag-Erling Smørgrav 			to->rep->prefetch_ttl = from->rep->prefetch_ttl;
2907b7579f77SDag-Erling Smørgrav 	}
2908b7579f77SDag-Erling Smørgrav 	/* are we done? */
2909b7579f77SDag-Erling Smørgrav 	foriq->num_current_queries --;
2910b7579f77SDag-Erling Smørgrav 	if(foriq->num_current_queries == 0)
2911b7579f77SDag-Erling Smørgrav 		foriq->state = FINISHED_STATE;
2912b7579f77SDag-Erling Smørgrav }
2913b7579f77SDag-Erling Smørgrav 
2914b7579f77SDag-Erling Smørgrav /**
2915b7579f77SDag-Erling Smørgrav  * Collect class ANY responses and make them into one response.  This
2916b7579f77SDag-Erling Smørgrav  * state is started and it creates queries for all classes (that have
2917b7579f77SDag-Erling Smørgrav  * root hints).  The answers are then collected.
2918b7579f77SDag-Erling Smørgrav  *
2919b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2920b7579f77SDag-Erling Smørgrav  * @param id: module id.
2921b7579f77SDag-Erling Smørgrav  * @return true if the event needs more immediate processing, false if not.
2922b7579f77SDag-Erling Smørgrav  */
2923b7579f77SDag-Erling Smørgrav static int
2924b7579f77SDag-Erling Smørgrav processCollectClass(struct module_qstate* qstate, int id)
2925b7579f77SDag-Erling Smørgrav {
2926b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
2927b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
2928b7579f77SDag-Erling Smørgrav 	/* If qchase.qclass == 0 then send out queries for all classes.
2929b7579f77SDag-Erling Smørgrav 	 * Otherwise, do nothing (wait for all answers to arrive and the
2930b7579f77SDag-Erling Smørgrav 	 * processClassResponse to put them together, and that moves us
2931b7579f77SDag-Erling Smørgrav 	 * towards the Finished state when done. */
2932b7579f77SDag-Erling Smørgrav 	if(iq->qchase.qclass == 0) {
2933b7579f77SDag-Erling Smørgrav 		uint16_t c = 0;
2934b7579f77SDag-Erling Smørgrav 		iq->qchase.qclass = LDNS_RR_CLASS_ANY;
2935b7579f77SDag-Erling Smørgrav 		while(iter_get_next_root(qstate->env->hints,
2936b7579f77SDag-Erling Smørgrav 			qstate->env->fwds, &c)) {
2937b7579f77SDag-Erling Smørgrav 			/* generate query for this class */
2938b7579f77SDag-Erling Smørgrav 			log_nametypeclass(VERB_ALGO, "spawn collect query",
2939b7579f77SDag-Erling Smørgrav 				qstate->qinfo.qname, qstate->qinfo.qtype, c);
2940b7579f77SDag-Erling Smørgrav 			if(!generate_sub_request(qstate->qinfo.qname,
2941b7579f77SDag-Erling Smørgrav 				qstate->qinfo.qname_len, qstate->qinfo.qtype,
2942b7579f77SDag-Erling Smørgrav 				c, qstate, id, iq, INIT_REQUEST_STATE,
2943b7579f77SDag-Erling Smørgrav 				FINISHED_STATE, &subq,
2944b7579f77SDag-Erling Smørgrav 				(int)!(qstate->query_flags&BIT_CD))) {
2945b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
2946b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
2947b7579f77SDag-Erling Smørgrav 			}
2948b7579f77SDag-Erling Smørgrav 			/* ignore subq, no special init required */
2949b7579f77SDag-Erling Smørgrav 			iq->num_current_queries ++;
2950b7579f77SDag-Erling Smørgrav 			if(c == 0xffff)
2951b7579f77SDag-Erling Smørgrav 				break;
2952b7579f77SDag-Erling Smørgrav 			else c++;
2953b7579f77SDag-Erling Smørgrav 		}
2954b7579f77SDag-Erling Smørgrav 		/* if no roots are configured at all, return */
2955b7579f77SDag-Erling Smørgrav 		if(iq->num_current_queries == 0) {
2956b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "No root hints or fwds, giving up "
2957b7579f77SDag-Erling Smørgrav 				"on qclass ANY");
2958b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_REFUSED);
2959b7579f77SDag-Erling Smørgrav 		}
2960b7579f77SDag-Erling Smørgrav 		/* return false, wait for queries to return */
2961b7579f77SDag-Erling Smørgrav 	}
2962b7579f77SDag-Erling Smørgrav 	/* if woke up here because of an answer, wait for more answers */
2963b7579f77SDag-Erling Smørgrav 	return 0;
2964b7579f77SDag-Erling Smørgrav }
2965b7579f77SDag-Erling Smørgrav 
2966b7579f77SDag-Erling Smørgrav /**
2967b7579f77SDag-Erling Smørgrav  * This handles the final state for first-tier responses (i.e., responses to
2968b7579f77SDag-Erling Smørgrav  * externally generated queries).
2969b7579f77SDag-Erling Smørgrav  *
2970b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2971b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
2972b7579f77SDag-Erling Smørgrav  * @param id: module id.
2973b7579f77SDag-Erling Smørgrav  * @return true if the event needs more processing, false if not. Since this
2974b7579f77SDag-Erling Smørgrav  *         is the final state for an event, it always returns false.
2975b7579f77SDag-Erling Smørgrav  */
2976b7579f77SDag-Erling Smørgrav static int
2977b7579f77SDag-Erling Smørgrav processFinished(struct module_qstate* qstate, struct iter_qstate* iq,
2978b7579f77SDag-Erling Smørgrav 	int id)
2979b7579f77SDag-Erling Smørgrav {
2980b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "finishing processing for",
2981b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
2982b7579f77SDag-Erling Smørgrav 
2983b7579f77SDag-Erling Smørgrav 	/* store negative cache element for parent side glue. */
2984bc892140SDag-Erling Smørgrav 	if(!qstate->no_cache_store && iq->query_for_pside_glue
2985bc892140SDag-Erling Smørgrav 		&& !iq->pside_glue)
2986b7579f77SDag-Erling Smørgrav 			iter_store_parentside_neg(qstate->env, &qstate->qinfo,
2987b7579f77SDag-Erling Smørgrav 				iq->deleg_msg?iq->deleg_msg->rep:
2988b7579f77SDag-Erling Smørgrav 				(iq->response?iq->response->rep:NULL));
2989b7579f77SDag-Erling Smørgrav 	if(!iq->response) {
2990b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "No response is set, servfail");
2991b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2992b7579f77SDag-Erling Smørgrav 	}
2993b7579f77SDag-Erling Smørgrav 
2994b7579f77SDag-Erling Smørgrav 	/* Make sure that the RA flag is set (since the presence of
2995b7579f77SDag-Erling Smørgrav 	 * this module means that recursion is available) */
2996b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags |= BIT_RA;
2997b7579f77SDag-Erling Smørgrav 
2998b7579f77SDag-Erling Smørgrav 	/* Clear the AA flag */
2999b7579f77SDag-Erling Smørgrav 	/* FIXME: does this action go here or in some other module? */
3000b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags &= ~BIT_AA;
3001b7579f77SDag-Erling Smørgrav 
3002b7579f77SDag-Erling Smørgrav 	/* make sure QR flag is on */
3003b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags |= BIT_QR;
3004b7579f77SDag-Erling Smørgrav 
3005b7579f77SDag-Erling Smørgrav 	/* we have finished processing this query */
3006b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_finished;
3007b7579f77SDag-Erling Smørgrav 
3008b7579f77SDag-Erling Smørgrav 	/* TODO:  we are using a private TTL, trim the response. */
3009b7579f77SDag-Erling Smørgrav 	/* if (mPrivateTTL > 0){IterUtils.setPrivateTTL(resp, mPrivateTTL); } */
3010b7579f77SDag-Erling Smørgrav 
3011b7579f77SDag-Erling Smørgrav 	/* prepend any items we have accumulated */
3012b7579f77SDag-Erling Smørgrav 	if(iq->an_prepend_list || iq->ns_prepend_list) {
3013b7579f77SDag-Erling Smørgrav 		if(!iter_prepend(iq, iq->response, qstate->region)) {
3014b7579f77SDag-Erling Smørgrav 			log_err("prepend rrsets: out of memory");
3015b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3016b7579f77SDag-Erling Smørgrav 		}
3017b7579f77SDag-Erling Smørgrav 		/* reset the query name back */
3018b7579f77SDag-Erling Smørgrav 		iq->response->qinfo = qstate->qinfo;
3019b7579f77SDag-Erling Smørgrav 		/* the security state depends on the combination */
3020b7579f77SDag-Erling Smørgrav 		iq->response->rep->security = sec_status_unchecked;
3021b7579f77SDag-Erling Smørgrav 		/* store message with the finished prepended items,
3022b7579f77SDag-Erling Smørgrav 		 * but only if we did recursion. The nonrecursion referral
3023b7579f77SDag-Erling Smørgrav 		 * from cache does not need to be stored in the msg cache. */
3024bc892140SDag-Erling Smørgrav 		if(!qstate->no_cache_store && qstate->query_flags&BIT_RD) {
30258ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &qstate->qinfo,
3026b7579f77SDag-Erling Smørgrav 				iq->response->rep, 0, qstate->prefetch_leeway,
3027b7579f77SDag-Erling Smørgrav 				iq->dp&&iq->dp->has_parent_side_NS,
3028ff825849SDag-Erling Smørgrav 				qstate->region, qstate->query_flags);
3029b7579f77SDag-Erling Smørgrav 		}
3030b7579f77SDag-Erling Smørgrav 	}
3031b7579f77SDag-Erling Smørgrav 	qstate->return_rcode = LDNS_RCODE_NOERROR;
3032b7579f77SDag-Erling Smørgrav 	qstate->return_msg = iq->response;
3033b7579f77SDag-Erling Smørgrav 	return 0;
3034b7579f77SDag-Erling Smørgrav }
3035b7579f77SDag-Erling Smørgrav 
3036b7579f77SDag-Erling Smørgrav /*
3037b7579f77SDag-Erling Smørgrav  * Return priming query results to interestes super querystates.
3038b7579f77SDag-Erling Smørgrav  *
3039b7579f77SDag-Erling Smørgrav  * Sets the delegation point and delegation message (not nonRD queries).
3040b7579f77SDag-Erling Smørgrav  * This is a callback from walk_supers.
3041b7579f77SDag-Erling Smørgrav  *
3042b7579f77SDag-Erling Smørgrav  * @param qstate: query state that finished.
3043b7579f77SDag-Erling Smørgrav  * @param id: module id.
3044b7579f77SDag-Erling Smørgrav  * @param super: the qstate to inform.
3045b7579f77SDag-Erling Smørgrav  */
3046b7579f77SDag-Erling Smørgrav void
3047b7579f77SDag-Erling Smørgrav iter_inform_super(struct module_qstate* qstate, int id,
3048b7579f77SDag-Erling Smørgrav 	struct module_qstate* super)
3049b7579f77SDag-Erling Smørgrav {
3050b7579f77SDag-Erling Smørgrav 	if(!qstate->is_priming && super->qinfo.qclass == LDNS_RR_CLASS_ANY)
3051b7579f77SDag-Erling Smørgrav 		processClassResponse(qstate, id, super);
3052b7579f77SDag-Erling Smørgrav 	else if(super->qinfo.qtype == LDNS_RR_TYPE_DS && ((struct iter_qstate*)
3053b7579f77SDag-Erling Smørgrav 		super->minfo[id])->state == DSNS_FIND_STATE)
3054b7579f77SDag-Erling Smørgrav 		processDSNSResponse(qstate, id, super);
3055b7579f77SDag-Erling Smørgrav 	else if(qstate->return_rcode != LDNS_RCODE_NOERROR)
3056b7579f77SDag-Erling Smørgrav 		error_supers(qstate, id, super);
3057b7579f77SDag-Erling Smørgrav 	else if(qstate->is_priming)
3058b7579f77SDag-Erling Smørgrav 		prime_supers(qstate, id, super);
3059b7579f77SDag-Erling Smørgrav 	else	processTargetResponse(qstate, id, super);
3060b7579f77SDag-Erling Smørgrav }
3061b7579f77SDag-Erling Smørgrav 
3062b7579f77SDag-Erling Smørgrav /**
3063b7579f77SDag-Erling Smørgrav  * Handle iterator state.
3064b7579f77SDag-Erling Smørgrav  * Handle events. This is the real processing loop for events, responsible
3065b7579f77SDag-Erling Smørgrav  * for moving events through the various states. If a processing method
3066b7579f77SDag-Erling Smørgrav  * returns true, then it will be advanced to the next state. If false, then
3067b7579f77SDag-Erling Smørgrav  * processing will stop.
3068b7579f77SDag-Erling Smørgrav  *
3069b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3070b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
3071b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
3072b7579f77SDag-Erling Smørgrav  * @param id: module id.
3073b7579f77SDag-Erling Smørgrav  */
3074b7579f77SDag-Erling Smørgrav static void
3075b7579f77SDag-Erling Smørgrav iter_handle(struct module_qstate* qstate, struct iter_qstate* iq,
3076b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
3077b7579f77SDag-Erling Smørgrav {
3078b7579f77SDag-Erling Smørgrav 	int cont = 1;
3079b7579f77SDag-Erling Smørgrav 	while(cont) {
3080b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "iter_handle processing q with state %s",
3081b7579f77SDag-Erling Smørgrav 			iter_state_to_string(iq->state));
3082b7579f77SDag-Erling Smørgrav 		switch(iq->state) {
3083b7579f77SDag-Erling Smørgrav 			case INIT_REQUEST_STATE:
3084b7579f77SDag-Erling Smørgrav 				cont = processInitRequest(qstate, iq, ie, id);
3085b7579f77SDag-Erling Smørgrav 				break;
3086b7579f77SDag-Erling Smørgrav 			case INIT_REQUEST_2_STATE:
3087b7579f77SDag-Erling Smørgrav 				cont = processInitRequest2(qstate, iq, id);
3088b7579f77SDag-Erling Smørgrav 				break;
3089b7579f77SDag-Erling Smørgrav 			case INIT_REQUEST_3_STATE:
3090b7579f77SDag-Erling Smørgrav 				cont = processInitRequest3(qstate, iq, id);
3091b7579f77SDag-Erling Smørgrav 				break;
3092b7579f77SDag-Erling Smørgrav 			case QUERYTARGETS_STATE:
3093b7579f77SDag-Erling Smørgrav 				cont = processQueryTargets(qstate, iq, ie, id);
3094b7579f77SDag-Erling Smørgrav 				break;
3095b7579f77SDag-Erling Smørgrav 			case QUERY_RESP_STATE:
3096b7579f77SDag-Erling Smørgrav 				cont = processQueryResponse(qstate, iq, id);
3097b7579f77SDag-Erling Smørgrav 				break;
3098b7579f77SDag-Erling Smørgrav 			case PRIME_RESP_STATE:
3099b7579f77SDag-Erling Smørgrav 				cont = processPrimeResponse(qstate, id);
3100b7579f77SDag-Erling Smørgrav 				break;
3101b7579f77SDag-Erling Smørgrav 			case COLLECT_CLASS_STATE:
3102b7579f77SDag-Erling Smørgrav 				cont = processCollectClass(qstate, id);
3103b7579f77SDag-Erling Smørgrav 				break;
3104b7579f77SDag-Erling Smørgrav 			case DSNS_FIND_STATE:
3105b7579f77SDag-Erling Smørgrav 				cont = processDSNSFind(qstate, iq, id);
3106b7579f77SDag-Erling Smørgrav 				break;
3107b7579f77SDag-Erling Smørgrav 			case FINISHED_STATE:
3108b7579f77SDag-Erling Smørgrav 				cont = processFinished(qstate, iq, id);
3109b7579f77SDag-Erling Smørgrav 				break;
3110b7579f77SDag-Erling Smørgrav 			default:
3111b7579f77SDag-Erling Smørgrav 				log_warn("iterator: invalid state: %d",
3112b7579f77SDag-Erling Smørgrav 					iq->state);
3113b7579f77SDag-Erling Smørgrav 				cont = 0;
3114b7579f77SDag-Erling Smørgrav 				break;
3115b7579f77SDag-Erling Smørgrav 		}
3116b7579f77SDag-Erling Smørgrav 	}
3117b7579f77SDag-Erling Smørgrav }
3118b7579f77SDag-Erling Smørgrav 
3119b7579f77SDag-Erling Smørgrav /**
3120b7579f77SDag-Erling Smørgrav  * This is the primary entry point for processing request events. Note that
3121b7579f77SDag-Erling Smørgrav  * this method should only be used by external modules.
3122b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3123b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
3124b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
3125b7579f77SDag-Erling Smørgrav  * @param id: module id.
3126b7579f77SDag-Erling Smørgrav  */
3127b7579f77SDag-Erling Smørgrav static void
3128b7579f77SDag-Erling Smørgrav process_request(struct module_qstate* qstate, struct iter_qstate* iq,
3129b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
3130b7579f77SDag-Erling Smørgrav {
3131b7579f77SDag-Erling Smørgrav 	/* external requests start in the INIT state, and finish using the
3132b7579f77SDag-Erling Smørgrav 	 * FINISHED state. */
3133b7579f77SDag-Erling Smørgrav 	iq->state = INIT_REQUEST_STATE;
3134b7579f77SDag-Erling Smørgrav 	iq->final_state = FINISHED_STATE;
3135b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "process_request: new external request event");
3136b7579f77SDag-Erling Smørgrav 	iter_handle(qstate, iq, ie, id);
3137b7579f77SDag-Erling Smørgrav }
3138b7579f77SDag-Erling Smørgrav 
3139b7579f77SDag-Erling Smørgrav /** process authoritative server reply */
3140b7579f77SDag-Erling Smørgrav static void
3141b7579f77SDag-Erling Smørgrav process_response(struct module_qstate* qstate, struct iter_qstate* iq,
3142b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id, struct outbound_entry* outbound,
3143b7579f77SDag-Erling Smørgrav 	enum module_ev event)
3144b7579f77SDag-Erling Smørgrav {
3145b7579f77SDag-Erling Smørgrav 	struct msg_parse* prs;
3146b7579f77SDag-Erling Smørgrav 	struct edns_data edns;
314717d15b25SDag-Erling Smørgrav 	sldns_buffer* pkt;
3148b7579f77SDag-Erling Smørgrav 
3149b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "process_response: new external response event");
3150b7579f77SDag-Erling Smørgrav 	iq->response = NULL;
3151b7579f77SDag-Erling Smørgrav 	iq->state = QUERY_RESP_STATE;
3152b7579f77SDag-Erling Smørgrav 	if(event == module_event_noreply || event == module_event_error) {
3153ff825849SDag-Erling Smørgrav 		if(event == module_event_noreply && iq->sent_count >= 3 &&
3154ff825849SDag-Erling Smørgrav 			qstate->env->cfg->use_caps_bits_for_id &&
3155ff825849SDag-Erling Smørgrav 			!iq->caps_fallback) {
3156ff825849SDag-Erling Smørgrav 			/* start fallback */
3157ff825849SDag-Erling Smørgrav 			iq->caps_fallback = 1;
3158ff825849SDag-Erling Smørgrav 			iq->caps_server = 0;
3159ff825849SDag-Erling Smørgrav 			iq->caps_reply = NULL;
316009a3aaf3SDag-Erling Smørgrav 			iq->caps_response = NULL;
3161ff825849SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
3162ff825849SDag-Erling Smørgrav 			iq->num_current_queries--;
3163ff825849SDag-Erling Smørgrav 			/* need fresh attempts for the 0x20 fallback, if
3164ff825849SDag-Erling Smørgrav 			 * that was the cause for the failure */
3165ff825849SDag-Erling Smørgrav 			iter_dec_attempts(iq->dp, 3);
3166ff825849SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: timeouts, starting fallback");
3167ff825849SDag-Erling Smørgrav 			goto handle_it;
3168ff825849SDag-Erling Smørgrav 		}
3169b7579f77SDag-Erling Smørgrav 		goto handle_it;
3170b7579f77SDag-Erling Smørgrav 	}
3171b7579f77SDag-Erling Smørgrav 	if( (event != module_event_reply && event != module_event_capsfail)
3172b7579f77SDag-Erling Smørgrav 		|| !qstate->reply) {
3173b7579f77SDag-Erling Smørgrav 		log_err("Bad event combined with response");
3174b7579f77SDag-Erling Smørgrav 		outbound_list_remove(&iq->outlist, outbound);
3175b7579f77SDag-Erling Smørgrav 		(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3176b7579f77SDag-Erling Smørgrav 		return;
3177b7579f77SDag-Erling Smørgrav 	}
3178b7579f77SDag-Erling Smørgrav 
3179b7579f77SDag-Erling Smørgrav 	/* parse message */
3180b7579f77SDag-Erling Smørgrav 	prs = (struct msg_parse*)regional_alloc(qstate->env->scratch,
3181b7579f77SDag-Erling Smørgrav 		sizeof(struct msg_parse));
3182b7579f77SDag-Erling Smørgrav 	if(!prs) {
3183b7579f77SDag-Erling Smørgrav 		log_err("out of memory on incoming message");
3184b7579f77SDag-Erling Smørgrav 		/* like packet got dropped */
3185b7579f77SDag-Erling Smørgrav 		goto handle_it;
3186b7579f77SDag-Erling Smørgrav 	}
3187b7579f77SDag-Erling Smørgrav 	memset(prs, 0, sizeof(*prs));
3188b7579f77SDag-Erling Smørgrav 	memset(&edns, 0, sizeof(edns));
3189b7579f77SDag-Erling Smørgrav 	pkt = qstate->reply->c->buffer;
319017d15b25SDag-Erling Smørgrav 	sldns_buffer_set_position(pkt, 0);
3191b7579f77SDag-Erling Smørgrav 	if(parse_packet(pkt, prs, qstate->env->scratch) != LDNS_RCODE_NOERROR) {
3192b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "parse error on reply packet");
3193b7579f77SDag-Erling Smørgrav 		goto handle_it;
3194b7579f77SDag-Erling Smørgrav 	}
3195b7579f77SDag-Erling Smørgrav 	/* edns is not examined, but removed from message to help cache */
3196e2d15004SDag-Erling Smørgrav 	if(parse_extract_edns(prs, &edns, qstate->env->scratch) !=
3197e2d15004SDag-Erling Smørgrav 		LDNS_RCODE_NOERROR)
3198b7579f77SDag-Erling Smørgrav 		goto handle_it;
3199bc892140SDag-Erling Smørgrav 
3200bc892140SDag-Erling Smørgrav 	/* Copy the edns options we may got from the back end */
3201bc892140SDag-Erling Smørgrav 	if(edns.opt_list) {
3202bc892140SDag-Erling Smørgrav 		qstate->edns_opts_back_in = edns_opt_copy_region(edns.opt_list,
3203bc892140SDag-Erling Smørgrav 			qstate->region);
3204bc892140SDag-Erling Smørgrav 		if(!qstate->edns_opts_back_in) {
3205bc892140SDag-Erling Smørgrav 			log_err("out of memory on incoming message");
3206bc892140SDag-Erling Smørgrav 			/* like packet got dropped */
3207bc892140SDag-Erling Smørgrav 			goto handle_it;
3208bc892140SDag-Erling Smørgrav 		}
3209*65b390aaSDag-Erling Smørgrav 		if(!inplace_cb_edns_back_parsed_call(qstate->env, qstate)) {
3210*65b390aaSDag-Erling Smørgrav 			log_err("unable to call edns_back_parsed callback");
3211*65b390aaSDag-Erling Smørgrav 			goto handle_it;
3212*65b390aaSDag-Erling Smørgrav 		}
3213bc892140SDag-Erling Smørgrav 	}
3214bc892140SDag-Erling Smørgrav 
3215b7579f77SDag-Erling Smørgrav 	/* remove CD-bit, we asked for in case we handle validation ourself */
3216b7579f77SDag-Erling Smørgrav 	prs->flags &= ~BIT_CD;
3217b7579f77SDag-Erling Smørgrav 
3218b7579f77SDag-Erling Smørgrav 	/* normalize and sanitize: easy to delete items from linked lists */
321905ab2901SDag-Erling Smørgrav 	if(!scrub_message(pkt, prs, &iq->qinfo_out, iq->dp->name,
322009a3aaf3SDag-Erling Smørgrav 		qstate->env->scratch, qstate->env, ie)) {
322109a3aaf3SDag-Erling Smørgrav 		/* if 0x20 enabled, start fallback, but we have no message */
322209a3aaf3SDag-Erling Smørgrav 		if(event == module_event_capsfail && !iq->caps_fallback) {
322309a3aaf3SDag-Erling Smørgrav 			iq->caps_fallback = 1;
322409a3aaf3SDag-Erling Smørgrav 			iq->caps_server = 0;
322509a3aaf3SDag-Erling Smørgrav 			iq->caps_reply = NULL;
322609a3aaf3SDag-Erling Smørgrav 			iq->caps_response = NULL;
322709a3aaf3SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
322809a3aaf3SDag-Erling Smørgrav 			iq->num_current_queries--;
322909a3aaf3SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: scrub failed, starting fallback with no response");
323009a3aaf3SDag-Erling Smørgrav 		}
3231b7579f77SDag-Erling Smørgrav 		goto handle_it;
323209a3aaf3SDag-Erling Smørgrav 	}
3233b7579f77SDag-Erling Smørgrav 
3234b7579f77SDag-Erling Smørgrav 	/* allocate response dns_msg in region */
3235b7579f77SDag-Erling Smørgrav 	iq->response = dns_alloc_msg(pkt, prs, qstate->region);
3236b7579f77SDag-Erling Smørgrav 	if(!iq->response)
3237b7579f77SDag-Erling Smørgrav 		goto handle_it;
3238b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_DETAIL, "response for", &qstate->qinfo);
3239b7579f77SDag-Erling Smørgrav 	log_name_addr(VERB_DETAIL, "reply from", iq->dp->name,
3240b7579f77SDag-Erling Smørgrav 		&qstate->reply->addr, qstate->reply->addrlen);
3241b7579f77SDag-Erling Smørgrav 	if(verbosity >= VERB_ALGO)
3242b7579f77SDag-Erling Smørgrav 		log_dns_msg("incoming scrubbed packet:", &iq->response->qinfo,
3243b7579f77SDag-Erling Smørgrav 			iq->response->rep);
3244b7579f77SDag-Erling Smørgrav 
3245ff825849SDag-Erling Smørgrav 	if(event == module_event_capsfail || iq->caps_fallback) {
32466480faa8SDag-Erling Smørgrav 		/* for fallback we care about main answer, not additionals */
32476480faa8SDag-Erling Smørgrav 		/* removing that makes comparison more likely to succeed */
32486480faa8SDag-Erling Smørgrav 		caps_strip_reply(iq->response->rep);
3249b7579f77SDag-Erling Smørgrav 		if(!iq->caps_fallback) {
3250b7579f77SDag-Erling Smørgrav 			/* start fallback */
3251b7579f77SDag-Erling Smørgrav 			iq->caps_fallback = 1;
3252b7579f77SDag-Erling Smørgrav 			iq->caps_server = 0;
3253b7579f77SDag-Erling Smørgrav 			iq->caps_reply = iq->response->rep;
325409a3aaf3SDag-Erling Smørgrav 			iq->caps_response = iq->response;
3255b7579f77SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
3256b7579f77SDag-Erling Smørgrav 			iq->num_current_queries--;
3257b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: starting fallback");
3258b7579f77SDag-Erling Smørgrav 			goto handle_it;
3259b7579f77SDag-Erling Smørgrav 		} else {
3260b7579f77SDag-Erling Smørgrav 			/* check if reply is the same, otherwise, fail */
3261ff825849SDag-Erling Smørgrav 			if(!iq->caps_reply) {
3262ff825849SDag-Erling Smørgrav 				iq->caps_reply = iq->response->rep;
326309a3aaf3SDag-Erling Smørgrav 				iq->caps_response = iq->response;
3264ff825849SDag-Erling Smørgrav 				iq->caps_server = -1; /*become zero at ++,
3265ff825849SDag-Erling Smørgrav 				so that we start the full set of trials */
326609a3aaf3SDag-Erling Smørgrav 			} else if(caps_failed_rcode(iq->caps_reply) &&
326709a3aaf3SDag-Erling Smørgrav 				!caps_failed_rcode(iq->response->rep)) {
326809a3aaf3SDag-Erling Smørgrav 				/* prefer to upgrade to non-SERVFAIL */
326909a3aaf3SDag-Erling Smørgrav 				iq->caps_reply = iq->response->rep;
327009a3aaf3SDag-Erling Smørgrav 				iq->caps_response = iq->response;
327109a3aaf3SDag-Erling Smørgrav 			} else if(!caps_failed_rcode(iq->caps_reply) &&
327209a3aaf3SDag-Erling Smørgrav 				caps_failed_rcode(iq->response->rep)) {
327309a3aaf3SDag-Erling Smørgrav 				/* if we have non-SERVFAIL as answer then
327409a3aaf3SDag-Erling Smørgrav 				 * we can ignore SERVFAILs for the equality
327509a3aaf3SDag-Erling Smørgrav 				 * comparison */
327609a3aaf3SDag-Erling Smørgrav 				/* no instructions here, skip other else */
327709a3aaf3SDag-Erling Smørgrav 			} else if(caps_failed_rcode(iq->caps_reply) &&
327809a3aaf3SDag-Erling Smørgrav 				caps_failed_rcode(iq->response->rep)) {
327909a3aaf3SDag-Erling Smørgrav 				/* failure is same as other failure in fallbk*/
328009a3aaf3SDag-Erling Smørgrav 				/* no instructions here, skip other else */
3281ff825849SDag-Erling Smørgrav 			} else if(!reply_equal(iq->response->rep, iq->caps_reply,
328217d15b25SDag-Erling Smørgrav 				qstate->env->scratch)) {
3283b7579f77SDag-Erling Smørgrav 				verbose(VERB_DETAIL, "Capsforid fallback: "
3284b7579f77SDag-Erling Smørgrav 					"getting different replies, failed");
3285b7579f77SDag-Erling Smørgrav 				outbound_list_remove(&iq->outlist, outbound);
3286b7579f77SDag-Erling Smørgrav 				(void)error_response(qstate, id,
3287b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
3288b7579f77SDag-Erling Smørgrav 				return;
3289b7579f77SDag-Erling Smørgrav 			}
3290b7579f77SDag-Erling Smørgrav 			/* continue the fallback procedure at next server */
3291b7579f77SDag-Erling Smørgrav 			iq->caps_server++;
3292b7579f77SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
3293b7579f77SDag-Erling Smørgrav 			iq->num_current_queries--;
3294b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: reply is equal. "
3295b7579f77SDag-Erling Smørgrav 				"go to next fallback");
3296b7579f77SDag-Erling Smørgrav 			goto handle_it;
3297b7579f77SDag-Erling Smørgrav 		}
3298b7579f77SDag-Erling Smørgrav 	}
3299b7579f77SDag-Erling Smørgrav 	iq->caps_fallback = 0; /* if we were in fallback, 0x20 is OK now */
3300b7579f77SDag-Erling Smørgrav 
3301b7579f77SDag-Erling Smørgrav handle_it:
3302b7579f77SDag-Erling Smørgrav 	outbound_list_remove(&iq->outlist, outbound);
3303b7579f77SDag-Erling Smørgrav 	iter_handle(qstate, iq, ie, id);
3304b7579f77SDag-Erling Smørgrav }
3305b7579f77SDag-Erling Smørgrav 
3306b7579f77SDag-Erling Smørgrav void
3307b7579f77SDag-Erling Smørgrav iter_operate(struct module_qstate* qstate, enum module_ev event, int id,
3308b7579f77SDag-Erling Smørgrav 	struct outbound_entry* outbound)
3309b7579f77SDag-Erling Smørgrav {
3310b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
3311b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
3312b7579f77SDag-Erling Smørgrav 	verbose(VERB_QUERY, "iterator[module %d] operate: extstate:%s event:%s",
3313b7579f77SDag-Erling Smørgrav 		id, strextstate(qstate->ext_state[id]), strmodulevent(event));
3314b7579f77SDag-Erling Smørgrav 	if(iq) log_query_info(VERB_QUERY, "iterator operate: query",
3315b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
3316b7579f77SDag-Erling Smørgrav 	if(iq && qstate->qinfo.qname != iq->qchase.qname)
3317b7579f77SDag-Erling Smørgrav 		log_query_info(VERB_QUERY, "iterator operate: chased to",
3318b7579f77SDag-Erling Smørgrav 			&iq->qchase);
3319b7579f77SDag-Erling Smørgrav 
3320b7579f77SDag-Erling Smørgrav 	/* perform iterator state machine */
3321b7579f77SDag-Erling Smørgrav 	if((event == module_event_new || event == module_event_pass) &&
3322b7579f77SDag-Erling Smørgrav 		iq == NULL) {
3323b7579f77SDag-Erling Smørgrav 		if(!iter_new(qstate, id)) {
3324b7579f77SDag-Erling Smørgrav 			(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3325b7579f77SDag-Erling Smørgrav 			return;
3326b7579f77SDag-Erling Smørgrav 		}
3327b7579f77SDag-Erling Smørgrav 		iq = (struct iter_qstate*)qstate->minfo[id];
3328b7579f77SDag-Erling Smørgrav 		process_request(qstate, iq, ie, id);
3329b7579f77SDag-Erling Smørgrav 		return;
3330b7579f77SDag-Erling Smørgrav 	}
3331b7579f77SDag-Erling Smørgrav 	if(iq && event == module_event_pass) {
3332b7579f77SDag-Erling Smørgrav 		iter_handle(qstate, iq, ie, id);
3333b7579f77SDag-Erling Smørgrav 		return;
3334b7579f77SDag-Erling Smørgrav 	}
3335b7579f77SDag-Erling Smørgrav 	if(iq && outbound) {
3336b7579f77SDag-Erling Smørgrav 		process_response(qstate, iq, ie, id, outbound, event);
3337b7579f77SDag-Erling Smørgrav 		return;
3338b7579f77SDag-Erling Smørgrav 	}
3339b7579f77SDag-Erling Smørgrav 	if(event == module_event_error) {
3340b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "got called with event error, giving up");
3341b7579f77SDag-Erling Smørgrav 		(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3342b7579f77SDag-Erling Smørgrav 		return;
3343b7579f77SDag-Erling Smørgrav 	}
3344b7579f77SDag-Erling Smørgrav 
3345b7579f77SDag-Erling Smørgrav 	log_err("bad event for iterator");
3346b7579f77SDag-Erling Smørgrav 	(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3347b7579f77SDag-Erling Smørgrav }
3348b7579f77SDag-Erling Smørgrav 
3349b7579f77SDag-Erling Smørgrav void
3350b7579f77SDag-Erling Smørgrav iter_clear(struct module_qstate* qstate, int id)
3351b7579f77SDag-Erling Smørgrav {
3352b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq;
3353b7579f77SDag-Erling Smørgrav 	if(!qstate)
3354b7579f77SDag-Erling Smørgrav 		return;
3355b7579f77SDag-Erling Smørgrav 	iq = (struct iter_qstate*)qstate->minfo[id];
3356b7579f77SDag-Erling Smørgrav 	if(iq) {
3357b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
335852df462fSXin LI 		if(iq->target_count && --iq->target_count[0] == 0)
335952df462fSXin LI 			free(iq->target_count);
3360b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
3361b7579f77SDag-Erling Smørgrav 	}
3362b7579f77SDag-Erling Smørgrav 	qstate->minfo[id] = NULL;
3363b7579f77SDag-Erling Smørgrav }
3364b7579f77SDag-Erling Smørgrav 
3365b7579f77SDag-Erling Smørgrav size_t
3366b7579f77SDag-Erling Smørgrav iter_get_mem(struct module_env* env, int id)
3367b7579f77SDag-Erling Smørgrav {
3368b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)env->modinfo[id];
3369b7579f77SDag-Erling Smørgrav 	if(!ie)
3370b7579f77SDag-Erling Smørgrav 		return 0;
3371b7579f77SDag-Erling Smørgrav 	return sizeof(*ie) + sizeof(int)*((size_t)ie->max_dependency_depth+1)
3372b7579f77SDag-Erling Smørgrav 		+ donotq_get_mem(ie->donotq) + priv_get_mem(ie->priv);
3373b7579f77SDag-Erling Smørgrav }
3374b7579f77SDag-Erling Smørgrav 
3375b7579f77SDag-Erling Smørgrav /**
3376b7579f77SDag-Erling Smørgrav  * The iterator function block
3377b7579f77SDag-Erling Smørgrav  */
3378b7579f77SDag-Erling Smørgrav static struct module_func_block iter_block = {
3379b7579f77SDag-Erling Smørgrav 	"iterator",
3380b7579f77SDag-Erling Smørgrav 	&iter_init, &iter_deinit, &iter_operate, &iter_inform_super,
3381b7579f77SDag-Erling Smørgrav 	&iter_clear, &iter_get_mem
3382b7579f77SDag-Erling Smørgrav };
3383b7579f77SDag-Erling Smørgrav 
3384b7579f77SDag-Erling Smørgrav struct module_func_block*
3385b7579f77SDag-Erling Smørgrav iter_get_funcblock(void)
3386b7579f77SDag-Erling Smørgrav {
3387b7579f77SDag-Erling Smørgrav 	return &iter_block;
3388b7579f77SDag-Erling Smørgrav }
3389b7579f77SDag-Erling Smørgrav 
3390b7579f77SDag-Erling Smørgrav const char*
3391b7579f77SDag-Erling Smørgrav iter_state_to_string(enum iter_state state)
3392b7579f77SDag-Erling Smørgrav {
3393b7579f77SDag-Erling Smørgrav 	switch (state)
3394b7579f77SDag-Erling Smørgrav 	{
3395b7579f77SDag-Erling Smørgrav 	case INIT_REQUEST_STATE :
3396b7579f77SDag-Erling Smørgrav 		return "INIT REQUEST STATE";
3397b7579f77SDag-Erling Smørgrav 	case INIT_REQUEST_2_STATE :
3398b7579f77SDag-Erling Smørgrav 		return "INIT REQUEST STATE (stage 2)";
3399b7579f77SDag-Erling Smørgrav 	case INIT_REQUEST_3_STATE:
3400b7579f77SDag-Erling Smørgrav 		return "INIT REQUEST STATE (stage 3)";
3401b7579f77SDag-Erling Smørgrav 	case QUERYTARGETS_STATE :
3402b7579f77SDag-Erling Smørgrav 		return "QUERY TARGETS STATE";
3403b7579f77SDag-Erling Smørgrav 	case PRIME_RESP_STATE :
3404b7579f77SDag-Erling Smørgrav 		return "PRIME RESPONSE STATE";
3405b7579f77SDag-Erling Smørgrav 	case COLLECT_CLASS_STATE :
3406b7579f77SDag-Erling Smørgrav 		return "COLLECT CLASS STATE";
3407b7579f77SDag-Erling Smørgrav 	case DSNS_FIND_STATE :
3408b7579f77SDag-Erling Smørgrav 		return "DSNS FIND STATE";
3409b7579f77SDag-Erling Smørgrav 	case QUERY_RESP_STATE :
3410b7579f77SDag-Erling Smørgrav 		return "QUERY RESPONSE STATE";
3411b7579f77SDag-Erling Smørgrav 	case FINISHED_STATE :
3412b7579f77SDag-Erling Smørgrav 		return "FINISHED RESPONSE STATE";
3413b7579f77SDag-Erling Smørgrav 	default :
3414b7579f77SDag-Erling Smørgrav 		return "UNKNOWN ITER STATE";
3415b7579f77SDag-Erling Smørgrav 	}
3416b7579f77SDag-Erling Smørgrav }
3417b7579f77SDag-Erling Smørgrav 
3418b7579f77SDag-Erling Smørgrav int
3419b7579f77SDag-Erling Smørgrav iter_state_is_responsestate(enum iter_state s)
3420b7579f77SDag-Erling Smørgrav {
3421b7579f77SDag-Erling Smørgrav 	switch(s) {
3422b7579f77SDag-Erling Smørgrav 		case INIT_REQUEST_STATE :
3423b7579f77SDag-Erling Smørgrav 		case INIT_REQUEST_2_STATE :
3424b7579f77SDag-Erling Smørgrav 		case INIT_REQUEST_3_STATE :
3425b7579f77SDag-Erling Smørgrav 		case QUERYTARGETS_STATE :
3426b7579f77SDag-Erling Smørgrav 		case COLLECT_CLASS_STATE :
3427b7579f77SDag-Erling Smørgrav 			return 0;
3428b7579f77SDag-Erling Smørgrav 		default:
3429b7579f77SDag-Erling Smørgrav 			break;
3430b7579f77SDag-Erling Smørgrav 	}
3431b7579f77SDag-Erling Smørgrav 	return 1;
3432b7579f77SDag-Erling Smørgrav }
3433