xref: /freebsd/contrib/unbound/iterator/iterator.c (revision e2d1500434f5c64506dad196d921caee199cad1c)
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
9109a3aaf3SDag-Erling Smørgrav caps_free(struct rbnode_t* 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);
150*e2d15004SDag-Erling Smørgrav 	iq->minimise_count = 0;
15105ab2901SDag-Erling Smørgrav 	if (qstate->env->cfg->qname_minimisation)
15205ab2901SDag-Erling Smørgrav 		iq->minimisation_state = INIT_MINIMISE_STATE;
15305ab2901SDag-Erling Smørgrav 	else
15405ab2901SDag-Erling Smørgrav 		iq->minimisation_state = DONOT_MINIMISE_STATE;
15505ab2901SDag-Erling Smørgrav 
15605ab2901SDag-Erling Smørgrav 	memset(&iq->qinfo_out, 0, sizeof(struct query_info));
157b7579f77SDag-Erling Smørgrav 	return 1;
158b7579f77SDag-Erling Smørgrav }
159b7579f77SDag-Erling Smørgrav 
160b7579f77SDag-Erling Smørgrav /**
161b7579f77SDag-Erling Smørgrav  * Transition to the next state. This can be used to advance a currently
162b7579f77SDag-Erling Smørgrav  * processing event. It cannot be used to reactivate a forEvent.
163b7579f77SDag-Erling Smørgrav  *
164b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state
165b7579f77SDag-Erling Smørgrav  * @param nextstate The state to transition to.
166b7579f77SDag-Erling Smørgrav  * @return true. This is so this can be called as the return value for the
167b7579f77SDag-Erling Smørgrav  *         actual process*State() methods. (Transitioning to the next state
168b7579f77SDag-Erling Smørgrav  *         implies further processing).
169b7579f77SDag-Erling Smørgrav  */
170b7579f77SDag-Erling Smørgrav static int
171b7579f77SDag-Erling Smørgrav next_state(struct iter_qstate* iq, enum iter_state nextstate)
172b7579f77SDag-Erling Smørgrav {
173b7579f77SDag-Erling Smørgrav 	/* If transitioning to a "response" state, make sure that there is a
174b7579f77SDag-Erling Smørgrav 	 * response */
175b7579f77SDag-Erling Smørgrav 	if(iter_state_is_responsestate(nextstate)) {
176b7579f77SDag-Erling Smørgrav 		if(iq->response == NULL) {
177b7579f77SDag-Erling Smørgrav 			log_err("transitioning to response state sans "
178b7579f77SDag-Erling Smørgrav 				"response.");
179b7579f77SDag-Erling Smørgrav 		}
180b7579f77SDag-Erling Smørgrav 	}
181b7579f77SDag-Erling Smørgrav 	iq->state = nextstate;
182b7579f77SDag-Erling Smørgrav 	return 1;
183b7579f77SDag-Erling Smørgrav }
184b7579f77SDag-Erling Smørgrav 
185b7579f77SDag-Erling Smørgrav /**
186b7579f77SDag-Erling Smørgrav  * Transition an event to its final state. Final states always either return
187b7579f77SDag-Erling Smørgrav  * a result up the module chain, or reactivate a dependent event. Which
18805ab2901SDag-Erling Smørgrav  * final state to transition to is set in the module state for the event when
189b7579f77SDag-Erling Smørgrav  * it was created, and depends on the original purpose of the event.
190b7579f77SDag-Erling Smørgrav  *
191b7579f77SDag-Erling Smørgrav  * The response is stored in the qstate->buf buffer.
192b7579f77SDag-Erling Smørgrav  *
193b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state
194b7579f77SDag-Erling Smørgrav  * @return false. This is so this method can be used as the return value for
195b7579f77SDag-Erling Smørgrav  *         the processState methods. (Transitioning to the final state
196b7579f77SDag-Erling Smørgrav  */
197b7579f77SDag-Erling Smørgrav static int
198b7579f77SDag-Erling Smørgrav final_state(struct iter_qstate* iq)
199b7579f77SDag-Erling Smørgrav {
200b7579f77SDag-Erling Smørgrav 	return next_state(iq, iq->final_state);
201b7579f77SDag-Erling Smørgrav }
202b7579f77SDag-Erling Smørgrav 
203b7579f77SDag-Erling Smørgrav /**
204b7579f77SDag-Erling Smørgrav  * Callback routine to handle errors in parent query states
205b7579f77SDag-Erling Smørgrav  * @param qstate: query state that failed.
206b7579f77SDag-Erling Smørgrav  * @param id: module id.
207b7579f77SDag-Erling Smørgrav  * @param super: super state.
208b7579f77SDag-Erling Smørgrav  */
209b7579f77SDag-Erling Smørgrav static void
210b7579f77SDag-Erling Smørgrav error_supers(struct module_qstate* qstate, int id, struct module_qstate* super)
211b7579f77SDag-Erling Smørgrav {
212b7579f77SDag-Erling Smørgrav 	struct iter_qstate* super_iq = (struct iter_qstate*)super->minfo[id];
213b7579f77SDag-Erling Smørgrav 
214b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_A ||
215b7579f77SDag-Erling Smørgrav 		qstate->qinfo.qtype == LDNS_RR_TYPE_AAAA) {
216b7579f77SDag-Erling Smørgrav 		/* mark address as failed. */
217b7579f77SDag-Erling Smørgrav 		struct delegpt_ns* dpns = NULL;
218b7579f77SDag-Erling Smørgrav 		if(super_iq->dp)
219b7579f77SDag-Erling Smørgrav 			dpns = delegpt_find_ns(super_iq->dp,
220b7579f77SDag-Erling Smørgrav 				qstate->qinfo.qname, qstate->qinfo.qname_len);
221b7579f77SDag-Erling Smørgrav 		if(!dpns) {
222b7579f77SDag-Erling Smørgrav 			/* not interested */
223b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "subq error, but not interested");
224b7579f77SDag-Erling Smørgrav 			log_query_info(VERB_ALGO, "superq", &super->qinfo);
225b7579f77SDag-Erling Smørgrav 			if(super_iq->dp)
226b7579f77SDag-Erling Smørgrav 				delegpt_log(VERB_ALGO, super_iq->dp);
227b7579f77SDag-Erling Smørgrav 			log_assert(0);
228b7579f77SDag-Erling Smørgrav 			return;
229b7579f77SDag-Erling Smørgrav 		} else {
230b7579f77SDag-Erling Smørgrav 			/* see if the failure did get (parent-lame) info */
231b7579f77SDag-Erling Smørgrav 			if(!cache_fill_missing(super->env,
232b7579f77SDag-Erling Smørgrav 				super_iq->qchase.qclass, super->region,
233b7579f77SDag-Erling Smørgrav 				super_iq->dp))
234b7579f77SDag-Erling Smørgrav 				log_err("out of memory adding missing");
235b7579f77SDag-Erling Smørgrav 		}
236b7579f77SDag-Erling Smørgrav 		dpns->resolved = 1; /* mark as failed */
237b7579f77SDag-Erling Smørgrav 		super_iq->num_target_queries--;
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 {
280b7579f77SDag-Erling Smørgrav 	/* store in cache */
281b7579f77SDag-Erling Smørgrav 	struct reply_info err;
282ff825849SDag-Erling Smørgrav 	if(qstate->prefetch_leeway > NORR_TTL) {
283ff825849SDag-Erling Smørgrav 		verbose(VERB_ALGO, "error response for prefetch in cache");
284ff825849SDag-Erling Smørgrav 		/* attempt to adjust the cache entry prefetch */
285ff825849SDag-Erling Smørgrav 		if(dns_cache_prefetch_adjust(qstate->env, &qstate->qinfo,
286ff825849SDag-Erling Smørgrav 			NORR_TTL, qstate->query_flags))
287ff825849SDag-Erling Smørgrav 			return error_response(qstate, id, rcode);
288ff825849SDag-Erling Smørgrav 		/* if that fails (not in cache), fall through to store err */
289ff825849SDag-Erling Smørgrav 	}
290b7579f77SDag-Erling Smørgrav 	memset(&err, 0, sizeof(err));
291b7579f77SDag-Erling Smørgrav 	err.flags = (uint16_t)(BIT_QR | BIT_RA);
292b7579f77SDag-Erling Smørgrav 	FLAGS_SET_RCODE(err.flags, rcode);
293b7579f77SDag-Erling Smørgrav 	err.qdcount = 1;
294b7579f77SDag-Erling Smørgrav 	err.ttl = NORR_TTL;
295b7579f77SDag-Erling Smørgrav 	err.prefetch_ttl = PREFETCH_TTL_CALC(err.ttl);
296b7579f77SDag-Erling Smørgrav 	/* do not waste time trying to validate this servfail */
297b7579f77SDag-Erling Smørgrav 	err.security = sec_status_indeterminate;
298b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "store error response in message cache");
299ff825849SDag-Erling Smørgrav 	iter_dns_store(qstate->env, &qstate->qinfo, &err, 0, 0, 0, NULL,
300ff825849SDag-Erling Smørgrav 		qstate->query_flags);
301b7579f77SDag-Erling Smørgrav 	return error_response(qstate, id, rcode);
302b7579f77SDag-Erling Smørgrav }
303b7579f77SDag-Erling Smørgrav 
304b7579f77SDag-Erling Smørgrav /** check if prepend item is duplicate item */
305b7579f77SDag-Erling Smørgrav static int
306b7579f77SDag-Erling Smørgrav prepend_is_duplicate(struct ub_packed_rrset_key** sets, size_t to,
307b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* dup)
308b7579f77SDag-Erling Smørgrav {
309b7579f77SDag-Erling Smørgrav 	size_t i;
310b7579f77SDag-Erling Smørgrav 	for(i=0; i<to; i++) {
311b7579f77SDag-Erling Smørgrav 		if(sets[i]->rk.type == dup->rk.type &&
312b7579f77SDag-Erling Smørgrav 			sets[i]->rk.rrset_class == dup->rk.rrset_class &&
313b7579f77SDag-Erling Smørgrav 			sets[i]->rk.dname_len == dup->rk.dname_len &&
314b7579f77SDag-Erling Smørgrav 			query_dname_compare(sets[i]->rk.dname, dup->rk.dname)
315b7579f77SDag-Erling Smørgrav 			== 0)
316b7579f77SDag-Erling Smørgrav 			return 1;
317b7579f77SDag-Erling Smørgrav 	}
318b7579f77SDag-Erling Smørgrav 	return 0;
319b7579f77SDag-Erling Smørgrav }
320b7579f77SDag-Erling Smørgrav 
321b7579f77SDag-Erling Smørgrav /** prepend the prepend list in the answer and authority section of dns_msg */
322b7579f77SDag-Erling Smørgrav static int
323b7579f77SDag-Erling Smørgrav iter_prepend(struct iter_qstate* iq, struct dns_msg* msg,
324b7579f77SDag-Erling Smørgrav 	struct regional* region)
325b7579f77SDag-Erling Smørgrav {
326b7579f77SDag-Erling Smørgrav 	struct iter_prep_list* p;
327b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key** sets;
328b7579f77SDag-Erling Smørgrav 	size_t num_an = 0, num_ns = 0;;
329b7579f77SDag-Erling Smørgrav 	for(p = iq->an_prepend_list; p; p = p->next)
330b7579f77SDag-Erling Smørgrav 		num_an++;
331b7579f77SDag-Erling Smørgrav 	for(p = iq->ns_prepend_list; p; p = p->next)
332b7579f77SDag-Erling Smørgrav 		num_ns++;
333b7579f77SDag-Erling Smørgrav 	if(num_an + num_ns == 0)
334b7579f77SDag-Erling Smørgrav 		return 1;
335b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "prepending %d rrsets", (int)num_an + (int)num_ns);
33609a3aaf3SDag-Erling Smørgrav 	if(num_an > RR_COUNT_MAX || num_ns > RR_COUNT_MAX ||
33709a3aaf3SDag-Erling Smørgrav 		msg->rep->rrset_count > RR_COUNT_MAX) return 0; /* overflow */
338b7579f77SDag-Erling Smørgrav 	sets = regional_alloc(region, (num_an+num_ns+msg->rep->rrset_count) *
339b7579f77SDag-Erling Smørgrav 		sizeof(struct ub_packed_rrset_key*));
340b7579f77SDag-Erling Smørgrav 	if(!sets)
341b7579f77SDag-Erling Smørgrav 		return 0;
342b7579f77SDag-Erling Smørgrav 	/* ANSWER section */
343b7579f77SDag-Erling Smørgrav 	num_an = 0;
344b7579f77SDag-Erling Smørgrav 	for(p = iq->an_prepend_list; p; p = p->next) {
345b7579f77SDag-Erling Smørgrav 		sets[num_an++] = p->rrset;
346b7579f77SDag-Erling Smørgrav 	}
347b7579f77SDag-Erling Smørgrav 	memcpy(sets+num_an, msg->rep->rrsets, msg->rep->an_numrrsets *
348b7579f77SDag-Erling Smørgrav 		sizeof(struct ub_packed_rrset_key*));
349b7579f77SDag-Erling Smørgrav 	/* AUTH section */
350b7579f77SDag-Erling Smørgrav 	num_ns = 0;
351b7579f77SDag-Erling Smørgrav 	for(p = iq->ns_prepend_list; p; p = p->next) {
352b7579f77SDag-Erling Smørgrav 		if(prepend_is_duplicate(sets+msg->rep->an_numrrsets+num_an,
353b7579f77SDag-Erling Smørgrav 			num_ns, p->rrset) || prepend_is_duplicate(
354b7579f77SDag-Erling Smørgrav 			msg->rep->rrsets+msg->rep->an_numrrsets,
355b7579f77SDag-Erling Smørgrav 			msg->rep->ns_numrrsets, p->rrset))
356b7579f77SDag-Erling Smørgrav 			continue;
357b7579f77SDag-Erling Smørgrav 		sets[msg->rep->an_numrrsets + num_an + num_ns++] = p->rrset;
358b7579f77SDag-Erling Smørgrav 	}
359b7579f77SDag-Erling Smørgrav 	memcpy(sets + num_an + msg->rep->an_numrrsets + num_ns,
360b7579f77SDag-Erling Smørgrav 		msg->rep->rrsets + msg->rep->an_numrrsets,
361b7579f77SDag-Erling Smørgrav 		(msg->rep->ns_numrrsets + msg->rep->ar_numrrsets) *
362b7579f77SDag-Erling Smørgrav 		sizeof(struct ub_packed_rrset_key*));
363b7579f77SDag-Erling Smørgrav 
364b7579f77SDag-Erling Smørgrav 	/* NXDOMAIN rcode can stay if we prepended DNAME/CNAMEs, because
365b7579f77SDag-Erling Smørgrav 	 * this is what recursors should give. */
366b7579f77SDag-Erling Smørgrav 	msg->rep->rrset_count += num_an + num_ns;
367b7579f77SDag-Erling Smørgrav 	msg->rep->an_numrrsets += num_an;
368b7579f77SDag-Erling Smørgrav 	msg->rep->ns_numrrsets += num_ns;
369b7579f77SDag-Erling Smørgrav 	msg->rep->rrsets = sets;
370b7579f77SDag-Erling Smørgrav 	return 1;
371b7579f77SDag-Erling Smørgrav }
372b7579f77SDag-Erling Smørgrav 
373b7579f77SDag-Erling Smørgrav /**
374b7579f77SDag-Erling Smørgrav  * Add rrset to ANSWER prepend list
375b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
376b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
377b7579f77SDag-Erling Smørgrav  * @param rrset: rrset to add.
378b7579f77SDag-Erling Smørgrav  * @return false on failure (malloc).
379b7579f77SDag-Erling Smørgrav  */
380b7579f77SDag-Erling Smørgrav static int
381b7579f77SDag-Erling Smørgrav iter_add_prepend_answer(struct module_qstate* qstate, struct iter_qstate* iq,
382b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset)
383b7579f77SDag-Erling Smørgrav {
384b7579f77SDag-Erling Smørgrav 	struct iter_prep_list* p = (struct iter_prep_list*)regional_alloc(
385b7579f77SDag-Erling Smørgrav 		qstate->region, sizeof(struct iter_prep_list));
386b7579f77SDag-Erling Smørgrav 	if(!p)
387b7579f77SDag-Erling Smørgrav 		return 0;
388b7579f77SDag-Erling Smørgrav 	p->rrset = rrset;
389b7579f77SDag-Erling Smørgrav 	p->next = NULL;
390b7579f77SDag-Erling Smørgrav 	/* add at end */
391b7579f77SDag-Erling Smørgrav 	if(iq->an_prepend_last)
392b7579f77SDag-Erling Smørgrav 		iq->an_prepend_last->next = p;
393b7579f77SDag-Erling Smørgrav 	else	iq->an_prepend_list = p;
394b7579f77SDag-Erling Smørgrav 	iq->an_prepend_last = p;
395b7579f77SDag-Erling Smørgrav 	return 1;
396b7579f77SDag-Erling Smørgrav }
397b7579f77SDag-Erling Smørgrav 
398b7579f77SDag-Erling Smørgrav /**
399b7579f77SDag-Erling Smørgrav  * Add rrset to AUTHORITY 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_auth(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->ns_prepend_last)
417b7579f77SDag-Erling Smørgrav 		iq->ns_prepend_last->next = p;
418b7579f77SDag-Erling Smørgrav 	else	iq->ns_prepend_list = p;
419b7579f77SDag-Erling Smørgrav 	iq->ns_prepend_last = p;
420b7579f77SDag-Erling Smørgrav 	return 1;
421b7579f77SDag-Erling Smørgrav }
422b7579f77SDag-Erling Smørgrav 
423b7579f77SDag-Erling Smørgrav /**
424b7579f77SDag-Erling Smørgrav  * Given a CNAME response (defined as a response containing a CNAME or DNAME
425b7579f77SDag-Erling Smørgrav  * that does not answer the request), process the response, modifying the
426b7579f77SDag-Erling Smørgrav  * state as necessary. This follows the CNAME/DNAME chain and returns the
427b7579f77SDag-Erling Smørgrav  * final query name.
428b7579f77SDag-Erling Smørgrav  *
429b7579f77SDag-Erling Smørgrav  * sets the new query name, after following the CNAME/DNAME chain.
430b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
431b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
432b7579f77SDag-Erling Smørgrav  * @param msg: the response.
433b7579f77SDag-Erling Smørgrav  * @param mname: returned target new query name.
434b7579f77SDag-Erling Smørgrav  * @param mname_len: length of mname.
435b7579f77SDag-Erling Smørgrav  * @return false on (malloc) error.
436b7579f77SDag-Erling Smørgrav  */
437b7579f77SDag-Erling Smørgrav static int
438b7579f77SDag-Erling Smørgrav handle_cname_response(struct module_qstate* qstate, struct iter_qstate* iq,
439b7579f77SDag-Erling Smørgrav         struct dns_msg* msg, uint8_t** mname, size_t* mname_len)
440b7579f77SDag-Erling Smørgrav {
441b7579f77SDag-Erling Smørgrav 	size_t i;
442b7579f77SDag-Erling Smørgrav 	/* Start with the (current) qname. */
443b7579f77SDag-Erling Smørgrav 	*mname = iq->qchase.qname;
444b7579f77SDag-Erling Smørgrav 	*mname_len = iq->qchase.qname_len;
445b7579f77SDag-Erling Smørgrav 
446b7579f77SDag-Erling Smørgrav 	/* Iterate over the ANSWER rrsets in order, looking for CNAMEs and
447b7579f77SDag-Erling Smørgrav 	 * DNAMES. */
448b7579f77SDag-Erling Smørgrav 	for(i=0; i<msg->rep->an_numrrsets; i++) {
449b7579f77SDag-Erling Smørgrav 		struct ub_packed_rrset_key* r = msg->rep->rrsets[i];
450b7579f77SDag-Erling Smørgrav 		/* If there is a (relevant) DNAME, add it to the list.
451b7579f77SDag-Erling Smørgrav 		 * We always expect there to be CNAME that was generated
452b7579f77SDag-Erling Smørgrav 		 * by this DNAME following, so we don't process the DNAME
453b7579f77SDag-Erling Smørgrav 		 * directly.  */
454b7579f77SDag-Erling Smørgrav 		if(ntohs(r->rk.type) == LDNS_RR_TYPE_DNAME &&
455b7579f77SDag-Erling Smørgrav 			dname_strict_subdomain_c(*mname, r->rk.dname)) {
456b7579f77SDag-Erling Smørgrav 			if(!iter_add_prepend_answer(qstate, iq, r))
457b7579f77SDag-Erling Smørgrav 				return 0;
458b7579f77SDag-Erling Smørgrav 			continue;
459b7579f77SDag-Erling Smørgrav 		}
460b7579f77SDag-Erling Smørgrav 
461b7579f77SDag-Erling Smørgrav 		if(ntohs(r->rk.type) == LDNS_RR_TYPE_CNAME &&
462b7579f77SDag-Erling Smørgrav 			query_dname_compare(*mname, r->rk.dname) == 0) {
463b7579f77SDag-Erling Smørgrav 			/* Add this relevant CNAME rrset to the prepend list.*/
464b7579f77SDag-Erling Smørgrav 			if(!iter_add_prepend_answer(qstate, iq, r))
465b7579f77SDag-Erling Smørgrav 				return 0;
466b7579f77SDag-Erling Smørgrav 			get_cname_target(r, mname, mname_len);
467b7579f77SDag-Erling Smørgrav 		}
468b7579f77SDag-Erling Smørgrav 
469b7579f77SDag-Erling Smørgrav 		/* Other rrsets in the section are ignored. */
470b7579f77SDag-Erling Smørgrav 	}
471b7579f77SDag-Erling Smørgrav 	/* add authority rrsets to authority prepend, for wildcarded CNAMEs */
472b7579f77SDag-Erling Smørgrav 	for(i=msg->rep->an_numrrsets; i<msg->rep->an_numrrsets +
473b7579f77SDag-Erling Smørgrav 		msg->rep->ns_numrrsets; i++) {
474b7579f77SDag-Erling Smørgrav 		struct ub_packed_rrset_key* r = msg->rep->rrsets[i];
475b7579f77SDag-Erling Smørgrav 		/* only add NSEC/NSEC3, as they may be needed for validation */
476b7579f77SDag-Erling Smørgrav 		if(ntohs(r->rk.type) == LDNS_RR_TYPE_NSEC ||
477b7579f77SDag-Erling Smørgrav 			ntohs(r->rk.type) == LDNS_RR_TYPE_NSEC3) {
478b7579f77SDag-Erling Smørgrav 			if(!iter_add_prepend_auth(qstate, iq, r))
479b7579f77SDag-Erling Smørgrav 				return 0;
480b7579f77SDag-Erling Smørgrav 		}
481b7579f77SDag-Erling Smørgrav 	}
482b7579f77SDag-Erling Smørgrav 	return 1;
483b7579f77SDag-Erling Smørgrav }
484b7579f77SDag-Erling Smørgrav 
48509a3aaf3SDag-Erling Smørgrav /** see if target name is caps-for-id whitelisted */
48609a3aaf3SDag-Erling Smørgrav static int
48709a3aaf3SDag-Erling Smørgrav is_caps_whitelisted(struct iter_env* ie, struct iter_qstate* iq)
48809a3aaf3SDag-Erling Smørgrav {
48909a3aaf3SDag-Erling Smørgrav 	if(!ie->caps_white) return 0; /* no whitelist, or no capsforid */
49009a3aaf3SDag-Erling Smørgrav 	return name_tree_lookup(ie->caps_white, iq->qchase.qname,
49109a3aaf3SDag-Erling Smørgrav 		iq->qchase.qname_len, dname_count_labels(iq->qchase.qname),
49209a3aaf3SDag-Erling Smørgrav 		iq->qchase.qclass) != NULL;
49309a3aaf3SDag-Erling Smørgrav }
49409a3aaf3SDag-Erling Smørgrav 
49552df462fSXin LI /** create target count structure for this query */
49652df462fSXin LI static void
49752df462fSXin LI target_count_create(struct iter_qstate* iq)
49852df462fSXin LI {
49952df462fSXin LI 	if(!iq->target_count) {
50052df462fSXin LI 		iq->target_count = (int*)calloc(2, sizeof(int));
50152df462fSXin LI 		/* if calloc fails we simply do not track this number */
50252df462fSXin LI 		if(iq->target_count)
50352df462fSXin LI 			iq->target_count[0] = 1;
50452df462fSXin LI 	}
50552df462fSXin LI }
50652df462fSXin LI 
50752df462fSXin LI static void
50852df462fSXin LI target_count_increase(struct iter_qstate* iq, int num)
50952df462fSXin LI {
51052df462fSXin LI 	target_count_create(iq);
51152df462fSXin LI 	if(iq->target_count)
51252df462fSXin LI 		iq->target_count[1] += num;
51352df462fSXin LI }
51452df462fSXin LI 
515b7579f77SDag-Erling Smørgrav /**
516b7579f77SDag-Erling Smørgrav  * Generate a subrequest.
517b7579f77SDag-Erling Smørgrav  * Generate a local request event. Local events are tied to this module, and
51805ab2901SDag-Erling Smørgrav  * have a corresponding (first tier) event that is waiting for this event to
519b7579f77SDag-Erling Smørgrav  * resolve to continue.
520b7579f77SDag-Erling Smørgrav  *
521b7579f77SDag-Erling Smørgrav  * @param qname The query name for this request.
522b7579f77SDag-Erling Smørgrav  * @param qnamelen length of qname
523b7579f77SDag-Erling Smørgrav  * @param qtype The query type for this request.
524b7579f77SDag-Erling Smørgrav  * @param qclass The query class for this request.
525b7579f77SDag-Erling Smørgrav  * @param qstate The event that is generating this event.
526b7579f77SDag-Erling Smørgrav  * @param id: module id.
527b7579f77SDag-Erling Smørgrav  * @param iq: The iterator state that is generating this event.
528b7579f77SDag-Erling Smørgrav  * @param initial_state The initial response state (normally this
529b7579f77SDag-Erling Smørgrav  *          is QUERY_RESP_STATE, unless it is known that the request won't
530b7579f77SDag-Erling Smørgrav  *          need iterative processing
531b7579f77SDag-Erling Smørgrav  * @param finalstate The final state for the response to this request.
532b7579f77SDag-Erling Smørgrav  * @param subq_ret: if newly allocated, the subquerystate, or NULL if it does
533b7579f77SDag-Erling Smørgrav  * 	not need initialisation.
534b7579f77SDag-Erling Smørgrav  * @param v: if true, validation is done on the subquery.
535b7579f77SDag-Erling Smørgrav  * @return false on error (malloc).
536b7579f77SDag-Erling Smørgrav  */
537b7579f77SDag-Erling Smørgrav static int
538b7579f77SDag-Erling Smørgrav generate_sub_request(uint8_t* qname, size_t qnamelen, uint16_t qtype,
539b7579f77SDag-Erling Smørgrav 	uint16_t qclass, struct module_qstate* qstate, int id,
540b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq, enum iter_state initial_state,
541b7579f77SDag-Erling Smørgrav 	enum iter_state finalstate, struct module_qstate** subq_ret, int v)
542b7579f77SDag-Erling Smørgrav {
543b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq = NULL;
544b7579f77SDag-Erling Smørgrav 	struct iter_qstate* subiq = NULL;
545b7579f77SDag-Erling Smørgrav 	uint16_t qflags = 0; /* OPCODE QUERY, no flags */
546b7579f77SDag-Erling Smørgrav 	struct query_info qinf;
547b7579f77SDag-Erling Smørgrav 	int prime = (finalstate == PRIME_RESP_STATE)?1:0;
548ff825849SDag-Erling Smørgrav 	int valrec = 0;
549b7579f77SDag-Erling Smørgrav 	qinf.qname = qname;
550b7579f77SDag-Erling Smørgrav 	qinf.qname_len = qnamelen;
551b7579f77SDag-Erling Smørgrav 	qinf.qtype = qtype;
552b7579f77SDag-Erling Smørgrav 	qinf.qclass = qclass;
553b7579f77SDag-Erling Smørgrav 
554b7579f77SDag-Erling Smørgrav 	/* RD should be set only when sending the query back through the INIT
555b7579f77SDag-Erling Smørgrav 	 * state. */
556b7579f77SDag-Erling Smørgrav 	if(initial_state == INIT_REQUEST_STATE)
557b7579f77SDag-Erling Smørgrav 		qflags |= BIT_RD;
558b7579f77SDag-Erling Smørgrav 	/* We set the CD flag so we can send this through the "head" of
559b7579f77SDag-Erling Smørgrav 	 * the resolution chain, which might have a validator. We are
560b7579f77SDag-Erling Smørgrav 	 * uninterested in validating things not on the direct resolution
561b7579f77SDag-Erling Smørgrav 	 * path.  */
562ff825849SDag-Erling Smørgrav 	if(!v) {
563b7579f77SDag-Erling Smørgrav 		qflags |= BIT_CD;
564ff825849SDag-Erling Smørgrav 		valrec = 1;
565ff825849SDag-Erling Smørgrav 	}
566b7579f77SDag-Erling Smørgrav 
567b7579f77SDag-Erling Smørgrav 	/* attach subquery, lookup existing or make a new one */
568b7579f77SDag-Erling Smørgrav 	fptr_ok(fptr_whitelist_modenv_attach_sub(qstate->env->attach_sub));
569ff825849SDag-Erling Smørgrav 	if(!(*qstate->env->attach_sub)(qstate, &qinf, qflags, prime, valrec,
570ff825849SDag-Erling Smørgrav 		&subq)) {
571b7579f77SDag-Erling Smørgrav 		return 0;
572b7579f77SDag-Erling Smørgrav 	}
573b7579f77SDag-Erling Smørgrav 	*subq_ret = subq;
574b7579f77SDag-Erling Smørgrav 	if(subq) {
575b7579f77SDag-Erling Smørgrav 		/* initialise the new subquery */
576b7579f77SDag-Erling Smørgrav 		subq->curmod = id;
577b7579f77SDag-Erling Smørgrav 		subq->ext_state[id] = module_state_initial;
578b7579f77SDag-Erling Smørgrav 		subq->minfo[id] = regional_alloc(subq->region,
579b7579f77SDag-Erling Smørgrav 			sizeof(struct iter_qstate));
580b7579f77SDag-Erling Smørgrav 		if(!subq->minfo[id]) {
581b7579f77SDag-Erling Smørgrav 			log_err("init subq: out of memory");
582b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
583b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
584b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
585b7579f77SDag-Erling Smørgrav 			return 0;
586b7579f77SDag-Erling Smørgrav 		}
587b7579f77SDag-Erling Smørgrav 		subiq = (struct iter_qstate*)subq->minfo[id];
588b7579f77SDag-Erling Smørgrav 		memset(subiq, 0, sizeof(*subiq));
589b7579f77SDag-Erling Smørgrav 		subiq->num_target_queries = 0;
59052df462fSXin LI 		target_count_create(iq);
59152df462fSXin LI 		subiq->target_count = iq->target_count;
59252df462fSXin LI 		if(iq->target_count)
59352df462fSXin LI 			iq->target_count[0] ++; /* extra reference */
594b7579f77SDag-Erling Smørgrav 		subiq->num_current_queries = 0;
595b7579f77SDag-Erling Smørgrav 		subiq->depth = iq->depth+1;
596b7579f77SDag-Erling Smørgrav 		outbound_list_init(&subiq->outlist);
597b7579f77SDag-Erling Smørgrav 		subiq->state = initial_state;
598b7579f77SDag-Erling Smørgrav 		subiq->final_state = finalstate;
599b7579f77SDag-Erling Smørgrav 		subiq->qchase = subq->qinfo;
600b7579f77SDag-Erling Smørgrav 		subiq->chase_flags = subq->query_flags;
601b7579f77SDag-Erling Smørgrav 		subiq->refetch_glue = 0;
60205ab2901SDag-Erling Smørgrav 		if(qstate->env->cfg->qname_minimisation)
60305ab2901SDag-Erling Smørgrav 			subiq->minimisation_state = INIT_MINIMISE_STATE;
60405ab2901SDag-Erling Smørgrav 		else
60505ab2901SDag-Erling Smørgrav 			subiq->minimisation_state = DONOT_MINIMISE_STATE;
60605ab2901SDag-Erling Smørgrav 		memset(&subiq->qinfo_out, 0, sizeof(struct query_info));
607b7579f77SDag-Erling Smørgrav 	}
608b7579f77SDag-Erling Smørgrav 	return 1;
609b7579f77SDag-Erling Smørgrav }
610b7579f77SDag-Erling Smørgrav 
611b7579f77SDag-Erling Smørgrav /**
612b7579f77SDag-Erling Smørgrav  * Generate and send a root priming request.
613b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
614b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
615b7579f77SDag-Erling Smørgrav  * @param id: module id.
616b7579f77SDag-Erling Smørgrav  * @param qclass: the class to prime.
617b7579f77SDag-Erling Smørgrav  * @return 0 on failure
618b7579f77SDag-Erling Smørgrav  */
619b7579f77SDag-Erling Smørgrav static int
620b7579f77SDag-Erling Smørgrav prime_root(struct module_qstate* qstate, struct iter_qstate* iq, int id,
621b7579f77SDag-Erling Smørgrav 	uint16_t qclass)
622b7579f77SDag-Erling Smørgrav {
623b7579f77SDag-Erling Smørgrav 	struct delegpt* dp;
624b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
625b7579f77SDag-Erling Smørgrav 	verbose(VERB_DETAIL, "priming . %s NS",
62617d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rr_classes, (int)qclass)?
62717d15b25SDag-Erling Smørgrav 		sldns_lookup_by_id(sldns_rr_classes, (int)qclass)->name:"??");
628b7579f77SDag-Erling Smørgrav 	dp = hints_lookup_root(qstate->env->hints, qclass);
629b7579f77SDag-Erling Smørgrav 	if(!dp) {
630b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "Cannot prime due to lack of hints");
631b7579f77SDag-Erling Smørgrav 		return 0;
632b7579f77SDag-Erling Smørgrav 	}
633b7579f77SDag-Erling Smørgrav 	/* Priming requests start at the QUERYTARGETS state, skipping
634b7579f77SDag-Erling Smørgrav 	 * the normal INIT state logic (which would cause an infloop). */
635b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request((uint8_t*)"\000", 1, LDNS_RR_TYPE_NS,
636b7579f77SDag-Erling Smørgrav 		qclass, qstate, id, iq, QUERYTARGETS_STATE, PRIME_RESP_STATE,
637b7579f77SDag-Erling Smørgrav 		&subq, 0)) {
638b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not prime root");
639b7579f77SDag-Erling Smørgrav 		return 0;
640b7579f77SDag-Erling Smørgrav 	}
641b7579f77SDag-Erling Smørgrav 	if(subq) {
642b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
643b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
644b7579f77SDag-Erling Smørgrav 		/* Set the initial delegation point to the hint.
645b7579f77SDag-Erling Smørgrav 		 * copy dp, it is now part of the root prime query.
646b7579f77SDag-Erling Smørgrav 		 * dp was part of in the fixed hints structure. */
647b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(dp, subq->region);
648b7579f77SDag-Erling Smørgrav 		if(!subiq->dp) {
649b7579f77SDag-Erling Smørgrav 			log_err("out of memory priming root, copydp");
650b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
651b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
652b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
653b7579f77SDag-Erling Smørgrav 			return 0;
654b7579f77SDag-Erling Smørgrav 		}
655b7579f77SDag-Erling Smørgrav 		/* there should not be any target queries. */
656b7579f77SDag-Erling Smørgrav 		subiq->num_target_queries = 0;
657b7579f77SDag-Erling Smørgrav 		subiq->dnssec_expected = iter_indicates_dnssec(
658b7579f77SDag-Erling Smørgrav 			qstate->env, subiq->dp, NULL, subq->qinfo.qclass);
659b7579f77SDag-Erling Smørgrav 	}
660b7579f77SDag-Erling Smørgrav 
661b7579f77SDag-Erling Smørgrav 	/* this module stops, our submodule starts, and does the query. */
662b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_wait_subquery;
663b7579f77SDag-Erling Smørgrav 	return 1;
664b7579f77SDag-Erling Smørgrav }
665b7579f77SDag-Erling Smørgrav 
666b7579f77SDag-Erling Smørgrav /**
667b7579f77SDag-Erling Smørgrav  * Generate and process a stub priming request. This method tests for the
668b7579f77SDag-Erling Smørgrav  * need to prime a stub zone, so it is safe to call for every request.
669b7579f77SDag-Erling Smørgrav  *
670b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
671b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
672b7579f77SDag-Erling Smørgrav  * @param id: module id.
673b7579f77SDag-Erling Smørgrav  * @param qname: request name.
674b7579f77SDag-Erling Smørgrav  * @param qclass: request class.
675b7579f77SDag-Erling Smørgrav  * @return true if a priming subrequest was made, false if not. The will only
676b7579f77SDag-Erling Smørgrav  *         issue a priming request if it detects an unprimed stub.
677b7579f77SDag-Erling Smørgrav  *         Uses value of 2 to signal during stub-prime in root-prime situation
678b7579f77SDag-Erling Smørgrav  *         that a noprime-stub is available and resolution can continue.
679b7579f77SDag-Erling Smørgrav  */
680b7579f77SDag-Erling Smørgrav static int
681b7579f77SDag-Erling Smørgrav prime_stub(struct module_qstate* qstate, struct iter_qstate* iq, int id,
682b7579f77SDag-Erling Smørgrav 	uint8_t* qname, uint16_t qclass)
683b7579f77SDag-Erling Smørgrav {
684b7579f77SDag-Erling Smørgrav 	/* Lookup the stub hint. This will return null if the stub doesn't
685b7579f77SDag-Erling Smørgrav 	 * need to be re-primed. */
686b7579f77SDag-Erling Smørgrav 	struct iter_hints_stub* stub;
687b7579f77SDag-Erling Smørgrav 	struct delegpt* stub_dp;
688b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
689b7579f77SDag-Erling Smørgrav 
690b7579f77SDag-Erling Smørgrav 	if(!qname) return 0;
691b7579f77SDag-Erling Smørgrav 	stub = hints_lookup_stub(qstate->env->hints, qname, qclass, iq->dp);
692b7579f77SDag-Erling Smørgrav 	/* The stub (if there is one) does not need priming. */
693b7579f77SDag-Erling Smørgrav 	if(!stub)
694b7579f77SDag-Erling Smørgrav 		return 0;
695b7579f77SDag-Erling Smørgrav 	stub_dp = stub->dp;
696b7579f77SDag-Erling Smørgrav 
697b7579f77SDag-Erling Smørgrav 	/* is it a noprime stub (always use) */
698b7579f77SDag-Erling Smørgrav 	if(stub->noprime) {
699b7579f77SDag-Erling Smørgrav 		int r = 0;
700b7579f77SDag-Erling Smørgrav 		if(iq->dp == NULL) r = 2;
701b7579f77SDag-Erling Smørgrav 		/* copy the dp out of the fixed hints structure, so that
702b7579f77SDag-Erling Smørgrav 		 * it can be changed when servicing this query */
703b7579f77SDag-Erling Smørgrav 		iq->dp = delegpt_copy(stub_dp, qstate->region);
704b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
705b7579f77SDag-Erling Smørgrav 			log_err("out of memory priming stub");
706b7579f77SDag-Erling Smørgrav 			(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
707b7579f77SDag-Erling Smørgrav 			return 1; /* return 1 to make module stop, with error */
708b7579f77SDag-Erling Smørgrav 		}
709b7579f77SDag-Erling Smørgrav 		log_nametypeclass(VERB_DETAIL, "use stub", stub_dp->name,
710b7579f77SDag-Erling Smørgrav 			LDNS_RR_TYPE_NS, qclass);
711b7579f77SDag-Erling Smørgrav 		return r;
712b7579f77SDag-Erling Smørgrav 	}
713b7579f77SDag-Erling Smørgrav 
714b7579f77SDag-Erling Smørgrav 	/* Otherwise, we need to (re)prime the stub. */
715b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_DETAIL, "priming stub", stub_dp->name,
716b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, qclass);
717b7579f77SDag-Erling Smørgrav 
718b7579f77SDag-Erling Smørgrav 	/* Stub priming events start at the QUERYTARGETS state to avoid the
719b7579f77SDag-Erling Smørgrav 	 * redundant INIT state processing. */
720b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(stub_dp->name, stub_dp->namelen,
721b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, qclass, qstate, id, iq,
722b7579f77SDag-Erling Smørgrav 		QUERYTARGETS_STATE, PRIME_RESP_STATE, &subq, 0)) {
723b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not prime stub");
724b7579f77SDag-Erling Smørgrav 		(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
725b7579f77SDag-Erling Smørgrav 		return 1; /* return 1 to make module stop, with error */
726b7579f77SDag-Erling Smørgrav 	}
727b7579f77SDag-Erling Smørgrav 	if(subq) {
728b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
729b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
730b7579f77SDag-Erling Smørgrav 
731b7579f77SDag-Erling Smørgrav 		/* Set the initial delegation point to the hint. */
732b7579f77SDag-Erling Smørgrav 		/* make copy to avoid use of stub dp by different qs/threads */
733b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(stub_dp, subq->region);
734b7579f77SDag-Erling Smørgrav 		if(!subiq->dp) {
735b7579f77SDag-Erling Smørgrav 			log_err("out of memory priming stub, copydp");
736b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
737b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
738b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
739b7579f77SDag-Erling Smørgrav 			(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
740b7579f77SDag-Erling Smørgrav 			return 1; /* return 1 to make module stop, with error */
741b7579f77SDag-Erling Smørgrav 		}
742b7579f77SDag-Erling Smørgrav 		/* there should not be any target queries -- although there
743b7579f77SDag-Erling Smørgrav 		 * wouldn't be anyway, since stub hints never have
744b7579f77SDag-Erling Smørgrav 		 * missing targets. */
745b7579f77SDag-Erling Smørgrav 		subiq->num_target_queries = 0;
746b7579f77SDag-Erling Smørgrav 		subiq->wait_priming_stub = 1;
747b7579f77SDag-Erling Smørgrav 		subiq->dnssec_expected = iter_indicates_dnssec(
748b7579f77SDag-Erling Smørgrav 			qstate->env, subiq->dp, NULL, subq->qinfo.qclass);
749b7579f77SDag-Erling Smørgrav 	}
750b7579f77SDag-Erling Smørgrav 
751b7579f77SDag-Erling Smørgrav 	/* this module stops, our submodule starts, and does the query. */
752b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_wait_subquery;
753b7579f77SDag-Erling Smørgrav 	return 1;
754b7579f77SDag-Erling Smørgrav }
755b7579f77SDag-Erling Smørgrav 
756b7579f77SDag-Erling Smørgrav /**
757b7579f77SDag-Erling Smørgrav  * Generate A and AAAA checks for glue that is in-zone for the referral
758b7579f77SDag-Erling Smørgrav  * we just got to obtain authoritative information on the adresses.
759b7579f77SDag-Erling Smørgrav  *
760b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
761b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
762b7579f77SDag-Erling Smørgrav  * @param id: module id.
763b7579f77SDag-Erling Smørgrav  */
764b7579f77SDag-Erling Smørgrav static void
765b7579f77SDag-Erling Smørgrav generate_a_aaaa_check(struct module_qstate* qstate, struct iter_qstate* iq,
766b7579f77SDag-Erling Smørgrav 	int id)
767b7579f77SDag-Erling Smørgrav {
768b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
769b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
770b7579f77SDag-Erling Smørgrav 	size_t i;
771b7579f77SDag-Erling Smørgrav 	struct reply_info* rep = iq->response->rep;
772b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* s;
773b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
774b7579f77SDag-Erling Smørgrav 
775b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth)
776b7579f77SDag-Erling Smørgrav 		return;
777b7579f77SDag-Erling Smørgrav 	/* walk through additional, and check if in-zone,
778b7579f77SDag-Erling Smørgrav 	 * only relevant A, AAAA are left after scrub anyway */
779b7579f77SDag-Erling Smørgrav 	for(i=rep->an_numrrsets+rep->ns_numrrsets; i<rep->rrset_count; i++) {
780b7579f77SDag-Erling Smørgrav 		s = rep->rrsets[i];
781b7579f77SDag-Erling Smørgrav 		/* check *ALL* addresses that are transmitted in additional*/
782b7579f77SDag-Erling Smørgrav 		/* is it an address ? */
783b7579f77SDag-Erling Smørgrav 		if( !(ntohs(s->rk.type)==LDNS_RR_TYPE_A ||
784b7579f77SDag-Erling Smørgrav 			ntohs(s->rk.type)==LDNS_RR_TYPE_AAAA)) {
785b7579f77SDag-Erling Smørgrav 			continue;
786b7579f77SDag-Erling Smørgrav 		}
787b7579f77SDag-Erling Smørgrav 		/* is this query the same as the A/AAAA check for it */
788b7579f77SDag-Erling Smørgrav 		if(qstate->qinfo.qtype == ntohs(s->rk.type) &&
789b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qclass == ntohs(s->rk.rrset_class) &&
790b7579f77SDag-Erling Smørgrav 			query_dname_compare(qstate->qinfo.qname,
791b7579f77SDag-Erling Smørgrav 				s->rk.dname)==0 &&
792b7579f77SDag-Erling Smørgrav 			(qstate->query_flags&BIT_RD) &&
793b7579f77SDag-Erling Smørgrav 			!(qstate->query_flags&BIT_CD))
794b7579f77SDag-Erling Smørgrav 			continue;
795b7579f77SDag-Erling Smørgrav 
796b7579f77SDag-Erling Smørgrav 		/* generate subrequest for it */
797b7579f77SDag-Erling Smørgrav 		log_nametypeclass(VERB_ALGO, "schedule addr fetch",
798b7579f77SDag-Erling Smørgrav 			s->rk.dname, ntohs(s->rk.type),
799b7579f77SDag-Erling Smørgrav 			ntohs(s->rk.rrset_class));
800b7579f77SDag-Erling Smørgrav 		if(!generate_sub_request(s->rk.dname, s->rk.dname_len,
801b7579f77SDag-Erling Smørgrav 			ntohs(s->rk.type), ntohs(s->rk.rrset_class),
802b7579f77SDag-Erling Smørgrav 			qstate, id, iq,
803b7579f77SDag-Erling Smørgrav 			INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1)) {
804b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "could not generate addr check");
805b7579f77SDag-Erling Smørgrav 			return;
806b7579f77SDag-Erling Smørgrav 		}
807b7579f77SDag-Erling Smørgrav 		/* ignore subq - not need for more init */
808b7579f77SDag-Erling Smørgrav 	}
809b7579f77SDag-Erling Smørgrav }
810b7579f77SDag-Erling Smørgrav 
811b7579f77SDag-Erling Smørgrav /**
812b7579f77SDag-Erling Smørgrav  * Generate a NS check request to obtain authoritative information
813b7579f77SDag-Erling Smørgrav  * on an NS rrset.
814b7579f77SDag-Erling Smørgrav  *
815b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
816b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
817b7579f77SDag-Erling Smørgrav  * @param id: module id.
818b7579f77SDag-Erling Smørgrav  */
819b7579f77SDag-Erling Smørgrav static void
820b7579f77SDag-Erling Smørgrav generate_ns_check(struct module_qstate* qstate, struct iter_qstate* iq, int id)
821b7579f77SDag-Erling Smørgrav {
822b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
823b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
824b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
825b7579f77SDag-Erling Smørgrav 
826b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth)
827b7579f77SDag-Erling Smørgrav 		return;
828b7579f77SDag-Erling Smørgrav 	/* is this query the same as the nscheck? */
829b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_NS &&
830b7579f77SDag-Erling Smørgrav 		query_dname_compare(iq->dp->name, qstate->qinfo.qname)==0 &&
831b7579f77SDag-Erling Smørgrav 		(qstate->query_flags&BIT_RD) && !(qstate->query_flags&BIT_CD)){
832b7579f77SDag-Erling Smørgrav 		/* spawn off A, AAAA queries for in-zone glue to check */
833b7579f77SDag-Erling Smørgrav 		generate_a_aaaa_check(qstate, iq, id);
834b7579f77SDag-Erling Smørgrav 		return;
835b7579f77SDag-Erling Smørgrav 	}
836b7579f77SDag-Erling Smørgrav 
837b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_ALGO, "schedule ns fetch",
838b7579f77SDag-Erling Smørgrav 		iq->dp->name, LDNS_RR_TYPE_NS, iq->qchase.qclass);
839b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(iq->dp->name, iq->dp->namelen,
840b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, iq->qchase.qclass, qstate, id, iq,
841b7579f77SDag-Erling Smørgrav 		INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1)) {
842b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not generate ns check");
843b7579f77SDag-Erling Smørgrav 		return;
844b7579f77SDag-Erling Smørgrav 	}
845b7579f77SDag-Erling Smørgrav 	if(subq) {
846b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
847b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
848b7579f77SDag-Erling Smørgrav 
849b7579f77SDag-Erling Smørgrav 		/* make copy to avoid use of stub dp by different qs/threads */
850b7579f77SDag-Erling Smørgrav 		/* refetch glue to start higher up the tree */
851b7579f77SDag-Erling Smørgrav 		subiq->refetch_glue = 1;
852b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(iq->dp, subq->region);
853b7579f77SDag-Erling Smørgrav 		if(!subiq->dp) {
854b7579f77SDag-Erling Smørgrav 			log_err("out of memory generating ns check, copydp");
855b7579f77SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_kill_sub(
856b7579f77SDag-Erling Smørgrav 				qstate->env->kill_sub));
857b7579f77SDag-Erling Smørgrav 			(*qstate->env->kill_sub)(subq);
858b7579f77SDag-Erling Smørgrav 			return;
859b7579f77SDag-Erling Smørgrav 		}
860b7579f77SDag-Erling Smørgrav 	}
861b7579f77SDag-Erling Smørgrav }
862b7579f77SDag-Erling Smørgrav 
863b7579f77SDag-Erling Smørgrav /**
864b7579f77SDag-Erling Smørgrav  * Generate a DNSKEY prefetch query to get the DNSKEY for the DS record we
865b7579f77SDag-Erling Smørgrav  * just got in a referral (where we have dnssec_expected, thus have trust
866b7579f77SDag-Erling Smørgrav  * anchors above it).  Note that right after calling this routine the
867b7579f77SDag-Erling Smørgrav  * iterator detached subqueries (because of following the referral), and thus
868b7579f77SDag-Erling Smørgrav  * the DNSKEY query becomes detached, its return stored in the cache for
869b7579f77SDag-Erling Smørgrav  * later lookup by the validator.  This cache lookup by the validator avoids
870b7579f77SDag-Erling Smørgrav  * the roundtrip incurred by the DNSKEY query.  The DNSKEY query is now
871b7579f77SDag-Erling Smørgrav  * performed at about the same time the original query is sent to the domain,
872b7579f77SDag-Erling Smørgrav  * thus the two answers are likely to be returned at about the same time,
873b7579f77SDag-Erling Smørgrav  * saving a roundtrip from the validated lookup.
874b7579f77SDag-Erling Smørgrav  *
875b7579f77SDag-Erling Smørgrav  * @param qstate: the qtstate that triggered the need to prime.
876b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
877b7579f77SDag-Erling Smørgrav  * @param id: module id.
878b7579f77SDag-Erling Smørgrav  */
879b7579f77SDag-Erling Smørgrav static void
880b7579f77SDag-Erling Smørgrav generate_dnskey_prefetch(struct module_qstate* qstate,
881b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq, int id)
882b7579f77SDag-Erling Smørgrav {
883b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
884b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
885b7579f77SDag-Erling Smørgrav 
886b7579f77SDag-Erling Smørgrav 	/* is this query the same as the prefetch? */
887b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qtype == LDNS_RR_TYPE_DNSKEY &&
888b7579f77SDag-Erling Smørgrav 		query_dname_compare(iq->dp->name, qstate->qinfo.qname)==0 &&
889b7579f77SDag-Erling Smørgrav 		(qstate->query_flags&BIT_RD) && !(qstate->query_flags&BIT_CD)){
890b7579f77SDag-Erling Smørgrav 		return;
891b7579f77SDag-Erling Smørgrav 	}
892b7579f77SDag-Erling Smørgrav 
893b7579f77SDag-Erling Smørgrav 	/* if the DNSKEY is in the cache this lookup will stop quickly */
894b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_ALGO, "schedule dnskey prefetch",
895b7579f77SDag-Erling Smørgrav 		iq->dp->name, LDNS_RR_TYPE_DNSKEY, iq->qchase.qclass);
896b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(iq->dp->name, iq->dp->namelen,
897b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_DNSKEY, iq->qchase.qclass, qstate, id, iq,
898b7579f77SDag-Erling Smørgrav 		INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0)) {
899b7579f77SDag-Erling Smørgrav 		/* we'll be slower, but it'll work */
900b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "could not generate dnskey prefetch");
901b7579f77SDag-Erling Smørgrav 		return;
902b7579f77SDag-Erling Smørgrav 	}
903b7579f77SDag-Erling Smørgrav 	if(subq) {
904b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
905b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
906b7579f77SDag-Erling Smørgrav 		/* this qstate has the right delegation for the dnskey lookup*/
907b7579f77SDag-Erling Smørgrav 		/* make copy to avoid use of stub dp by different qs/threads */
908b7579f77SDag-Erling Smørgrav 		subiq->dp = delegpt_copy(iq->dp, subq->region);
909b7579f77SDag-Erling Smørgrav 		/* if !subiq->dp, it'll start from the cache, no problem */
910b7579f77SDag-Erling Smørgrav 	}
911b7579f77SDag-Erling Smørgrav }
912b7579f77SDag-Erling Smørgrav 
913b7579f77SDag-Erling Smørgrav /**
914b7579f77SDag-Erling Smørgrav  * See if the query needs forwarding.
915b7579f77SDag-Erling Smørgrav  *
916b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
917b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
918b7579f77SDag-Erling Smørgrav  * @return true if the request is forwarded, false if not.
919b7579f77SDag-Erling Smørgrav  * 	If returns true but, iq->dp is NULL then a malloc failure occurred.
920b7579f77SDag-Erling Smørgrav  */
921b7579f77SDag-Erling Smørgrav static int
922b7579f77SDag-Erling Smørgrav forward_request(struct module_qstate* qstate, struct iter_qstate* iq)
923b7579f77SDag-Erling Smørgrav {
924b7579f77SDag-Erling Smørgrav 	struct delegpt* dp;
925b7579f77SDag-Erling Smørgrav 	uint8_t* delname = iq->qchase.qname;
926b7579f77SDag-Erling Smørgrav 	size_t delnamelen = iq->qchase.qname_len;
927b7579f77SDag-Erling Smørgrav 	if(iq->refetch_glue) {
928b7579f77SDag-Erling Smørgrav 		delname = iq->dp->name;
929b7579f77SDag-Erling Smørgrav 		delnamelen = iq->dp->namelen;
930b7579f77SDag-Erling Smørgrav 	}
931b7579f77SDag-Erling Smørgrav 	/* strip one label off of DS query to lookup higher for it */
932b7579f77SDag-Erling Smørgrav 	if( (iq->qchase.qtype == LDNS_RR_TYPE_DS || iq->refetch_glue)
933b7579f77SDag-Erling Smørgrav 		&& !dname_is_root(iq->qchase.qname))
934b7579f77SDag-Erling Smørgrav 		dname_remove_label(&delname, &delnamelen);
935b7579f77SDag-Erling Smørgrav 	dp = forwards_lookup(qstate->env->fwds, delname, iq->qchase.qclass);
936b7579f77SDag-Erling Smørgrav 	if(!dp)
937b7579f77SDag-Erling Smørgrav 		return 0;
938b7579f77SDag-Erling Smørgrav 	/* send recursion desired to forward addr */
939b7579f77SDag-Erling Smørgrav 	iq->chase_flags |= BIT_RD;
940b7579f77SDag-Erling Smørgrav 	iq->dp = delegpt_copy(dp, qstate->region);
941b7579f77SDag-Erling Smørgrav 	/* iq->dp checked by caller */
942b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "forwarding request");
943b7579f77SDag-Erling Smørgrav 	return 1;
944b7579f77SDag-Erling Smørgrav }
945b7579f77SDag-Erling Smørgrav 
946b7579f77SDag-Erling Smørgrav /**
947b7579f77SDag-Erling Smørgrav  * Process the initial part of the request handling. This state roughly
948b7579f77SDag-Erling Smørgrav  * corresponds to resolver algorithms steps 1 (find answer in cache) and 2
949b7579f77SDag-Erling Smørgrav  * (find the best servers to ask).
950b7579f77SDag-Erling Smørgrav  *
951b7579f77SDag-Erling Smørgrav  * Note that all requests start here, and query restarts revisit this state.
952b7579f77SDag-Erling Smørgrav  *
953b7579f77SDag-Erling Smørgrav  * This state either generates: 1) a response, from cache or error, 2) a
954b7579f77SDag-Erling Smørgrav  * priming event, or 3) forwards the request to the next state (init2,
955b7579f77SDag-Erling Smørgrav  * generally).
956b7579f77SDag-Erling Smørgrav  *
957b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
958b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
959b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
960b7579f77SDag-Erling Smørgrav  * @param id: module id.
961b7579f77SDag-Erling Smørgrav  * @return true if the event needs more request processing immediately,
962b7579f77SDag-Erling Smørgrav  *         false if not.
963b7579f77SDag-Erling Smørgrav  */
964b7579f77SDag-Erling Smørgrav static int
965b7579f77SDag-Erling Smørgrav processInitRequest(struct module_qstate* qstate, struct iter_qstate* iq,
966b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
967b7579f77SDag-Erling Smørgrav {
968b7579f77SDag-Erling Smørgrav 	uint8_t* delname;
969b7579f77SDag-Erling Smørgrav 	size_t delnamelen;
970b7579f77SDag-Erling Smørgrav 	struct dns_msg* msg;
971b7579f77SDag-Erling Smørgrav 
972b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_DETAIL, "resolving", &qstate->qinfo);
973b7579f77SDag-Erling Smørgrav 	/* check effort */
974b7579f77SDag-Erling Smørgrav 
975b7579f77SDag-Erling Smørgrav 	/* We enforce a maximum number of query restarts. This is primarily a
976b7579f77SDag-Erling Smørgrav 	 * cheap way to prevent CNAME loops. */
977b7579f77SDag-Erling Smørgrav 	if(iq->query_restart_count > MAX_RESTART_COUNT) {
978b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum number"
979b7579f77SDag-Erling Smørgrav 			" of query restarts with %d", iq->query_restart_count);
980b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
981b7579f77SDag-Erling Smørgrav 	}
982b7579f77SDag-Erling Smørgrav 
983b7579f77SDag-Erling Smørgrav 	/* We enforce a maximum recursion/dependency depth -- in general,
984b7579f77SDag-Erling Smørgrav 	 * this is unnecessary for dependency loops (although it will
985b7579f77SDag-Erling Smørgrav 	 * catch those), but it provides a sensible limit to the amount
986b7579f77SDag-Erling Smørgrav 	 * of work required to answer a given query. */
987b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "request has dependency depth of %d", iq->depth);
988b7579f77SDag-Erling Smørgrav 	if(iq->depth > ie->max_dependency_depth) {
989b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum "
990b7579f77SDag-Erling Smørgrav 			"dependency depth with depth of %d", iq->depth);
991b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
992b7579f77SDag-Erling Smørgrav 	}
993b7579f77SDag-Erling Smørgrav 
994b7579f77SDag-Erling Smørgrav 	/* If the request is qclass=ANY, setup to generate each class */
995b7579f77SDag-Erling Smørgrav 	if(qstate->qinfo.qclass == LDNS_RR_CLASS_ANY) {
996b7579f77SDag-Erling Smørgrav 		iq->qchase.qclass = 0;
997b7579f77SDag-Erling Smørgrav 		return next_state(iq, COLLECT_CLASS_STATE);
998b7579f77SDag-Erling Smørgrav 	}
999b7579f77SDag-Erling Smørgrav 
1000b7579f77SDag-Erling Smørgrav 	/* Resolver Algorithm Step 1 -- Look for the answer in local data. */
1001b7579f77SDag-Erling Smørgrav 
1002b7579f77SDag-Erling Smørgrav 	/* This either results in a query restart (CNAME cache response), a
1003b7579f77SDag-Erling Smørgrav 	 * terminating response (ANSWER), or a cache miss (null). */
1004b7579f77SDag-Erling Smørgrav 
1005b7579f77SDag-Erling Smørgrav 	if(qstate->blacklist) {
1006b7579f77SDag-Erling Smørgrav 		/* if cache, or anything else, was blacklisted then
1007b7579f77SDag-Erling Smørgrav 		 * getting older results from cache is a bad idea, no cache */
1008b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "cache blacklisted, going to the network");
1009b7579f77SDag-Erling Smørgrav 		msg = NULL;
1010b7579f77SDag-Erling Smørgrav 	} else {
1011b7579f77SDag-Erling Smørgrav 		msg = dns_cache_lookup(qstate->env, iq->qchase.qname,
1012b7579f77SDag-Erling Smørgrav 			iq->qchase.qname_len, iq->qchase.qtype,
1013ff825849SDag-Erling Smørgrav 			iq->qchase.qclass, qstate->query_flags,
1014ff825849SDag-Erling Smørgrav 			qstate->region, qstate->env->scratch);
1015b7579f77SDag-Erling Smørgrav 		if(!msg && qstate->env->neg_cache) {
1016b7579f77SDag-Erling Smørgrav 			/* lookup in negative cache; may result in
1017b7579f77SDag-Erling Smørgrav 			 * NOERROR/NODATA or NXDOMAIN answers that need validation */
1018b7579f77SDag-Erling Smørgrav 			msg = val_neg_getmsg(qstate->env->neg_cache, &iq->qchase,
1019b7579f77SDag-Erling Smørgrav 				qstate->region, qstate->env->rrset_cache,
1020b7579f77SDag-Erling Smørgrav 				qstate->env->scratch_buffer,
1021b7579f77SDag-Erling Smørgrav 				*qstate->env->now, 1/*add SOA*/, NULL);
1022b7579f77SDag-Erling Smørgrav 		}
1023b7579f77SDag-Erling Smørgrav 		/* item taken from cache does not match our query name, thus
1024b7579f77SDag-Erling Smørgrav 		 * security needs to be re-examined later */
1025b7579f77SDag-Erling Smørgrav 		if(msg && query_dname_compare(qstate->qinfo.qname,
1026b7579f77SDag-Erling Smørgrav 			iq->qchase.qname) != 0)
1027b7579f77SDag-Erling Smørgrav 			msg->rep->security = sec_status_unchecked;
1028b7579f77SDag-Erling Smørgrav 	}
1029b7579f77SDag-Erling Smørgrav 	if(msg) {
1030b7579f77SDag-Erling Smørgrav 		/* handle positive cache response */
1031b7579f77SDag-Erling Smørgrav 		enum response_type type = response_type_from_cache(msg,
1032b7579f77SDag-Erling Smørgrav 			&iq->qchase);
1033b7579f77SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO) {
1034b7579f77SDag-Erling Smørgrav 			log_dns_msg("msg from cache lookup", &msg->qinfo,
1035b7579f77SDag-Erling Smørgrav 				msg->rep);
1036b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "msg ttl is %d, prefetch ttl %d",
1037b7579f77SDag-Erling Smørgrav 				(int)msg->rep->ttl,
1038b7579f77SDag-Erling Smørgrav 				(int)msg->rep->prefetch_ttl);
1039b7579f77SDag-Erling Smørgrav 		}
1040b7579f77SDag-Erling Smørgrav 
1041b7579f77SDag-Erling Smørgrav 		if(type == RESPONSE_TYPE_CNAME) {
1042b7579f77SDag-Erling Smørgrav 			uint8_t* sname = 0;
1043b7579f77SDag-Erling Smørgrav 			size_t slen = 0;
1044b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "returning CNAME response from "
1045b7579f77SDag-Erling Smørgrav 				"cache");
1046b7579f77SDag-Erling Smørgrav 			if(!handle_cname_response(qstate, iq, msg,
1047b7579f77SDag-Erling Smørgrav 				&sname, &slen))
1048b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1049b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
1050b7579f77SDag-Erling Smørgrav 			iq->qchase.qname = sname;
1051b7579f77SDag-Erling Smørgrav 			iq->qchase.qname_len = slen;
1052b7579f77SDag-Erling Smørgrav 			/* This *is* a query restart, even if it is a cheap
1053b7579f77SDag-Erling Smørgrav 			 * one. */
1054b7579f77SDag-Erling Smørgrav 			iq->dp = NULL;
1055b7579f77SDag-Erling Smørgrav 			iq->refetch_glue = 0;
1056b7579f77SDag-Erling Smørgrav 			iq->query_restart_count++;
1057b7579f77SDag-Erling Smørgrav 			iq->sent_count = 0;
1058b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin, NULL, 0, qstate->region);
105905ab2901SDag-Erling Smørgrav 			if(qstate->env->cfg->qname_minimisation)
106005ab2901SDag-Erling Smørgrav 				iq->minimisation_state = INIT_MINIMISE_STATE;
1061b7579f77SDag-Erling Smørgrav 			return next_state(iq, INIT_REQUEST_STATE);
1062b7579f77SDag-Erling Smørgrav 		}
1063b7579f77SDag-Erling Smørgrav 
1064b7579f77SDag-Erling Smørgrav 		/* if from cache, NULL, else insert 'cache IP' len=0 */
1065b7579f77SDag-Erling Smørgrav 		if(qstate->reply_origin)
1066b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin, NULL, 0, qstate->region);
1067b7579f77SDag-Erling Smørgrav 		/* it is an answer, response, to final state */
1068b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "returning answer from cache.");
1069b7579f77SDag-Erling Smørgrav 		iq->response = msg;
1070b7579f77SDag-Erling Smørgrav 		return final_state(iq);
1071b7579f77SDag-Erling Smørgrav 	}
1072b7579f77SDag-Erling Smørgrav 
1073b7579f77SDag-Erling Smørgrav 	/* attempt to forward the request */
1074b7579f77SDag-Erling Smørgrav 	if(forward_request(qstate, iq))
1075b7579f77SDag-Erling Smørgrav 	{
1076b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
1077b7579f77SDag-Erling Smørgrav 			log_err("alloc failure for forward dp");
1078b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1079b7579f77SDag-Erling Smørgrav 		}
1080b7579f77SDag-Erling Smørgrav 		iq->refetch_glue = 0;
108105ab2901SDag-Erling Smørgrav 		iq->minimisation_state = DONOT_MINIMISE_STATE;
1082b7579f77SDag-Erling Smørgrav 		/* the request has been forwarded.
1083b7579f77SDag-Erling Smørgrav 		 * forwarded requests need to be immediately sent to the
1084b7579f77SDag-Erling Smørgrav 		 * next state, QUERYTARGETS. */
1085b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
1086b7579f77SDag-Erling Smørgrav 	}
1087b7579f77SDag-Erling Smørgrav 
1088b7579f77SDag-Erling Smørgrav 	/* Resolver Algorithm Step 2 -- find the "best" servers. */
1089b7579f77SDag-Erling Smørgrav 
1090b7579f77SDag-Erling Smørgrav 	/* first, adjust for DS queries. To avoid the grandparent problem,
1091b7579f77SDag-Erling Smørgrav 	 * we just look for the closest set of server to the parent of qname.
1092b7579f77SDag-Erling Smørgrav 	 * When re-fetching glue we also need to ask the parent.
1093b7579f77SDag-Erling Smørgrav 	 */
1094b7579f77SDag-Erling Smørgrav 	if(iq->refetch_glue) {
1095b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
1096b7579f77SDag-Erling Smørgrav 			log_err("internal or malloc fail: no dp for refetch");
1097b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1098b7579f77SDag-Erling Smørgrav 		}
1099b7579f77SDag-Erling Smørgrav 		delname = iq->dp->name;
1100b7579f77SDag-Erling Smørgrav 		delnamelen = iq->dp->namelen;
1101b7579f77SDag-Erling Smørgrav 	} else {
1102b7579f77SDag-Erling Smørgrav 		delname = iq->qchase.qname;
1103b7579f77SDag-Erling Smørgrav 		delnamelen = iq->qchase.qname_len;
1104b7579f77SDag-Erling Smørgrav 	}
1105b7579f77SDag-Erling Smørgrav 	if(iq->qchase.qtype == LDNS_RR_TYPE_DS || iq->refetch_glue ||
1106b7579f77SDag-Erling Smørgrav 	   (iq->qchase.qtype == LDNS_RR_TYPE_NS && qstate->prefetch_leeway)) {
1107b7579f77SDag-Erling Smørgrav 		/* remove first label from delname, root goes to hints,
1108b7579f77SDag-Erling Smørgrav 		 * but only to fetch glue, not for qtype=DS. */
1109b7579f77SDag-Erling Smørgrav 		/* also when prefetching an NS record, fetch it again from
1110b7579f77SDag-Erling Smørgrav 		 * its parent, just as if it expired, so that you do not
1111b7579f77SDag-Erling Smørgrav 		 * get stuck on an older nameserver that gives old NSrecords */
1112b7579f77SDag-Erling Smørgrav 		if(dname_is_root(delname) && (iq->refetch_glue ||
1113b7579f77SDag-Erling Smørgrav 			(iq->qchase.qtype == LDNS_RR_TYPE_NS &&
1114b7579f77SDag-Erling Smørgrav 			qstate->prefetch_leeway)))
1115b7579f77SDag-Erling Smørgrav 			delname = NULL; /* go to root priming */
1116b7579f77SDag-Erling Smørgrav 		else 	dname_remove_label(&delname, &delnamelen);
1117b7579f77SDag-Erling Smørgrav 	}
1118b7579f77SDag-Erling Smørgrav 	/* delname is the name to lookup a delegation for. If NULL rootprime */
1119b7579f77SDag-Erling Smørgrav 	while(1) {
1120b7579f77SDag-Erling Smørgrav 
1121b7579f77SDag-Erling Smørgrav 		/* Lookup the delegation in the cache. If null, then the
1122b7579f77SDag-Erling Smørgrav 		 * cache needs to be primed for the qclass. */
1123b7579f77SDag-Erling Smørgrav 		if(delname)
1124b7579f77SDag-Erling Smørgrav 		     iq->dp = dns_cache_find_delegation(qstate->env, delname,
1125b7579f77SDag-Erling Smørgrav 			delnamelen, iq->qchase.qtype, iq->qchase.qclass,
1126b7579f77SDag-Erling Smørgrav 			qstate->region, &iq->deleg_msg,
1127b7579f77SDag-Erling Smørgrav 			*qstate->env->now+qstate->prefetch_leeway);
1128b7579f77SDag-Erling Smørgrav 		else iq->dp = NULL;
1129b7579f77SDag-Erling Smørgrav 
1130b7579f77SDag-Erling Smørgrav 		/* If the cache has returned nothing, then we have a
1131b7579f77SDag-Erling Smørgrav 		 * root priming situation. */
1132b7579f77SDag-Erling Smørgrav 		if(iq->dp == NULL) {
1133b7579f77SDag-Erling Smørgrav 			/* if there is a stub, then no root prime needed */
1134b7579f77SDag-Erling Smørgrav 			int r = prime_stub(qstate, iq, id, delname,
1135b7579f77SDag-Erling Smørgrav 				iq->qchase.qclass);
1136b7579f77SDag-Erling Smørgrav 			if(r == 2)
1137b7579f77SDag-Erling Smørgrav 				break; /* got noprime-stub-zone, continue */
1138b7579f77SDag-Erling Smørgrav 			else if(r)
1139b7579f77SDag-Erling Smørgrav 				return 0; /* stub prime request made */
1140b7579f77SDag-Erling Smørgrav 			if(forwards_lookup_root(qstate->env->fwds,
1141b7579f77SDag-Erling Smørgrav 				iq->qchase.qclass)) {
1142b7579f77SDag-Erling Smørgrav 				/* forward zone root, no root prime needed */
1143b7579f77SDag-Erling Smørgrav 				/* fill in some dp - safety belt */
1144b7579f77SDag-Erling Smørgrav 				iq->dp = hints_lookup_root(qstate->env->hints,
1145b7579f77SDag-Erling Smørgrav 					iq->qchase.qclass);
1146b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1147b7579f77SDag-Erling Smørgrav 					log_err("internal error: no hints dp");
1148b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1149b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1150b7579f77SDag-Erling Smørgrav 				}
1151b7579f77SDag-Erling Smørgrav 				iq->dp = delegpt_copy(iq->dp, qstate->region);
1152b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1153b7579f77SDag-Erling Smørgrav 					log_err("out of memory in safety belt");
1154b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1155b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1156b7579f77SDag-Erling Smørgrav 				}
1157b7579f77SDag-Erling Smørgrav 				return next_state(iq, INIT_REQUEST_2_STATE);
1158b7579f77SDag-Erling Smørgrav 			}
1159b7579f77SDag-Erling Smørgrav 			/* Note that the result of this will set a new
1160b7579f77SDag-Erling Smørgrav 			 * DelegationPoint based on the result of priming. */
1161b7579f77SDag-Erling Smørgrav 			if(!prime_root(qstate, iq, id, iq->qchase.qclass))
1162b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1163b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_REFUSED);
1164b7579f77SDag-Erling Smørgrav 
1165b7579f77SDag-Erling Smørgrav 			/* priming creates and sends a subordinate query, with
1166b7579f77SDag-Erling Smørgrav 			 * this query as the parent. So further processing for
1167b7579f77SDag-Erling Smørgrav 			 * this event will stop until reactivated by the
1168b7579f77SDag-Erling Smørgrav 			 * results of priming. */
1169b7579f77SDag-Erling Smørgrav 			return 0;
1170b7579f77SDag-Erling Smørgrav 		}
117109a3aaf3SDag-Erling Smørgrav 		if(!iq->ratelimit_ok && qstate->prefetch_leeway)
117209a3aaf3SDag-Erling Smørgrav 			iq->ratelimit_ok = 1; /* allow prefetches, this keeps
117309a3aaf3SDag-Erling Smørgrav 			otherwise valid data in the cache */
117409a3aaf3SDag-Erling Smørgrav 		if(!iq->ratelimit_ok && infra_ratelimit_exceeded(
117509a3aaf3SDag-Erling Smørgrav 			qstate->env->infra_cache, iq->dp->name,
117609a3aaf3SDag-Erling Smørgrav 			iq->dp->namelen, *qstate->env->now)) {
117709a3aaf3SDag-Erling Smørgrav 			/* and increment the rate, so that the rate for time
117809a3aaf3SDag-Erling Smørgrav 			 * now will also exceed the rate, keeping cache fresh */
117909a3aaf3SDag-Erling Smørgrav 			(void)infra_ratelimit_inc(qstate->env->infra_cache,
118009a3aaf3SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
118109a3aaf3SDag-Erling Smørgrav 				*qstate->env->now);
118209a3aaf3SDag-Erling Smørgrav 			/* see if we are passed through with slip factor */
118309a3aaf3SDag-Erling Smørgrav 			if(qstate->env->cfg->ratelimit_factor != 0 &&
118409a3aaf3SDag-Erling Smørgrav 				ub_random_max(qstate->env->rnd,
118509a3aaf3SDag-Erling Smørgrav 				    qstate->env->cfg->ratelimit_factor) == 1) {
118609a3aaf3SDag-Erling Smørgrav 				iq->ratelimit_ok = 1;
118709a3aaf3SDag-Erling Smørgrav 				log_nametypeclass(VERB_ALGO, "ratelimit allowed through for "
118809a3aaf3SDag-Erling Smørgrav 					"delegation point", iq->dp->name,
118909a3aaf3SDag-Erling Smørgrav 					LDNS_RR_TYPE_NS, LDNS_RR_CLASS_IN);
119009a3aaf3SDag-Erling Smørgrav 			} else {
119109a3aaf3SDag-Erling Smørgrav 				log_nametypeclass(VERB_ALGO, "ratelimit exceeded with "
119209a3aaf3SDag-Erling Smørgrav 					"delegation point", iq->dp->name,
119309a3aaf3SDag-Erling Smørgrav 					LDNS_RR_TYPE_NS, LDNS_RR_CLASS_IN);
119409a3aaf3SDag-Erling Smørgrav 				return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
119509a3aaf3SDag-Erling Smørgrav 			}
119609a3aaf3SDag-Erling Smørgrav 		}
1197b7579f77SDag-Erling Smørgrav 
1198b7579f77SDag-Erling Smørgrav 		/* see if this dp not useless.
1199b7579f77SDag-Erling Smørgrav 		 * It is useless if:
1200b7579f77SDag-Erling Smørgrav 		 *	o all NS items are required glue.
1201b7579f77SDag-Erling Smørgrav 		 *	  or the query is for NS item that is required glue.
1202b7579f77SDag-Erling Smørgrav 		 *	o no addresses are provided.
1203b7579f77SDag-Erling Smørgrav 		 *	o RD qflag is on.
1204b7579f77SDag-Erling Smørgrav 		 * Instead, go up one level, and try to get even further
1205b7579f77SDag-Erling Smørgrav 		 * If the root was useless, use safety belt information.
1206b7579f77SDag-Erling Smørgrav 		 * Only check cache returns, because replies for servers
1207b7579f77SDag-Erling Smørgrav 		 * could be useless but lead to loops (bumping into the
1208b7579f77SDag-Erling Smørgrav 		 * same server reply) if useless-checked.
1209b7579f77SDag-Erling Smørgrav 		 */
1210b7579f77SDag-Erling Smørgrav 		if(iter_dp_is_useless(&qstate->qinfo, qstate->query_flags,
1211b7579f77SDag-Erling Smørgrav 			iq->dp)) {
1212b7579f77SDag-Erling Smørgrav 			if(dname_is_root(iq->dp->name)) {
1213b7579f77SDag-Erling Smørgrav 				/* use safety belt */
1214b7579f77SDag-Erling Smørgrav 				verbose(VERB_QUERY, "Cache has root NS but "
1215b7579f77SDag-Erling Smørgrav 				"no addresses. Fallback to the safety belt.");
1216b7579f77SDag-Erling Smørgrav 				iq->dp = hints_lookup_root(qstate->env->hints,
1217b7579f77SDag-Erling Smørgrav 					iq->qchase.qclass);
1218b7579f77SDag-Erling Smørgrav 				/* note deleg_msg is from previous lookup,
1219b7579f77SDag-Erling Smørgrav 				 * but RD is on, so it is not used */
1220b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1221b7579f77SDag-Erling Smørgrav 					log_err("internal error: no hints dp");
1222b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1223b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_REFUSED);
1224b7579f77SDag-Erling Smørgrav 				}
1225b7579f77SDag-Erling Smørgrav 				iq->dp = delegpt_copy(iq->dp, qstate->region);
1226b7579f77SDag-Erling Smørgrav 				if(!iq->dp) {
1227b7579f77SDag-Erling Smørgrav 					log_err("out of memory in safety belt");
1228b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1229b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1230b7579f77SDag-Erling Smørgrav 				}
1231b7579f77SDag-Erling Smørgrav 				break;
1232b7579f77SDag-Erling Smørgrav 			} else {
1233b7579f77SDag-Erling Smørgrav 				verbose(VERB_ALGO,
1234b7579f77SDag-Erling Smørgrav 					"cache delegation was useless:");
1235b7579f77SDag-Erling Smørgrav 				delegpt_log(VERB_ALGO, iq->dp);
1236b7579f77SDag-Erling Smørgrav 				/* go up */
1237b7579f77SDag-Erling Smørgrav 				delname = iq->dp->name;
1238b7579f77SDag-Erling Smørgrav 				delnamelen = iq->dp->namelen;
1239b7579f77SDag-Erling Smørgrav 				dname_remove_label(&delname, &delnamelen);
1240b7579f77SDag-Erling Smørgrav 			}
1241b7579f77SDag-Erling Smørgrav 		} else break;
1242b7579f77SDag-Erling Smørgrav 	}
1243b7579f77SDag-Erling Smørgrav 
1244b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "cache delegation returns delegpt");
1245b7579f77SDag-Erling Smørgrav 	delegpt_log(VERB_ALGO, iq->dp);
1246b7579f77SDag-Erling Smørgrav 
1247b7579f77SDag-Erling Smørgrav 	/* Otherwise, set the current delegation point and move on to the
1248b7579f77SDag-Erling Smørgrav 	 * next state. */
1249b7579f77SDag-Erling Smørgrav 	return next_state(iq, INIT_REQUEST_2_STATE);
1250b7579f77SDag-Erling Smørgrav }
1251b7579f77SDag-Erling Smørgrav 
1252b7579f77SDag-Erling Smørgrav /**
1253b7579f77SDag-Erling Smørgrav  * Process the second part of the initial request handling. This state
1254b7579f77SDag-Erling Smørgrav  * basically exists so that queries that generate root priming events have
1255b7579f77SDag-Erling Smørgrav  * the same init processing as ones that do not. Request events that reach
1256b7579f77SDag-Erling Smørgrav  * this state must have a valid currentDelegationPoint set.
1257b7579f77SDag-Erling Smørgrav  *
1258b7579f77SDag-Erling Smørgrav  * This part is primarly handling stub zone priming. Events that reach this
1259b7579f77SDag-Erling Smørgrav  * state must have a current delegation point.
1260b7579f77SDag-Erling Smørgrav  *
1261b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1262b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1263b7579f77SDag-Erling Smørgrav  * @param id: module id.
1264b7579f77SDag-Erling Smørgrav  * @return true if the event needs more request processing immediately,
1265b7579f77SDag-Erling Smørgrav  *         false if not.
1266b7579f77SDag-Erling Smørgrav  */
1267b7579f77SDag-Erling Smørgrav static int
1268b7579f77SDag-Erling Smørgrav processInitRequest2(struct module_qstate* qstate, struct iter_qstate* iq,
1269b7579f77SDag-Erling Smørgrav 	int id)
1270b7579f77SDag-Erling Smørgrav {
1271b7579f77SDag-Erling Smørgrav 	uint8_t* delname;
1272b7579f77SDag-Erling Smørgrav 	size_t delnamelen;
1273b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "resolving (init part 2): ",
1274b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
1275b7579f77SDag-Erling Smørgrav 
1276b7579f77SDag-Erling Smørgrav 	if(iq->refetch_glue) {
1277b7579f77SDag-Erling Smørgrav 		if(!iq->dp) {
1278b7579f77SDag-Erling Smørgrav 			log_err("internal or malloc fail: no dp for refetch");
1279b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1280b7579f77SDag-Erling Smørgrav 		}
1281b7579f77SDag-Erling Smørgrav 		delname = iq->dp->name;
1282b7579f77SDag-Erling Smørgrav 		delnamelen = iq->dp->namelen;
1283b7579f77SDag-Erling Smørgrav 	} else {
1284b7579f77SDag-Erling Smørgrav 		delname = iq->qchase.qname;
1285b7579f77SDag-Erling Smørgrav 		delnamelen = iq->qchase.qname_len;
1286b7579f77SDag-Erling Smørgrav 	}
1287b7579f77SDag-Erling Smørgrav 	if(iq->qchase.qtype == LDNS_RR_TYPE_DS || iq->refetch_glue) {
1288b7579f77SDag-Erling Smørgrav 		if(!dname_is_root(delname))
1289b7579f77SDag-Erling Smørgrav 			dname_remove_label(&delname, &delnamelen);
1290b7579f77SDag-Erling Smørgrav 		iq->refetch_glue = 0; /* if CNAME causes restart, no refetch */
1291b7579f77SDag-Erling Smørgrav 	}
1292b7579f77SDag-Erling Smørgrav 	/* Check to see if we need to prime a stub zone. */
1293b7579f77SDag-Erling Smørgrav 	if(prime_stub(qstate, iq, id, delname, iq->qchase.qclass)) {
1294b7579f77SDag-Erling Smørgrav 		/* A priming sub request was made */
1295b7579f77SDag-Erling Smørgrav 		return 0;
1296b7579f77SDag-Erling Smørgrav 	}
1297b7579f77SDag-Erling Smørgrav 
1298b7579f77SDag-Erling Smørgrav 	/* most events just get forwarded to the next state. */
1299b7579f77SDag-Erling Smørgrav 	return next_state(iq, INIT_REQUEST_3_STATE);
1300b7579f77SDag-Erling Smørgrav }
1301b7579f77SDag-Erling Smørgrav 
1302b7579f77SDag-Erling Smørgrav /**
1303b7579f77SDag-Erling Smørgrav  * Process the third part of the initial request handling. This state exists
1304b7579f77SDag-Erling Smørgrav  * as a separate state so that queries that generate stub priming events
1305b7579f77SDag-Erling Smørgrav  * will get the tail end of the init process but not repeat the stub priming
1306b7579f77SDag-Erling Smørgrav  * check.
1307b7579f77SDag-Erling Smørgrav  *
1308b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1309b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1310b7579f77SDag-Erling Smørgrav  * @param id: module id.
1311b7579f77SDag-Erling Smørgrav  * @return true, advancing the event to the QUERYTARGETS_STATE.
1312b7579f77SDag-Erling Smørgrav  */
1313b7579f77SDag-Erling Smørgrav static int
1314b7579f77SDag-Erling Smørgrav processInitRequest3(struct module_qstate* qstate, struct iter_qstate* iq,
1315b7579f77SDag-Erling Smørgrav 	int id)
1316b7579f77SDag-Erling Smørgrav {
1317b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "resolving (init part 3): ",
1318b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
1319b7579f77SDag-Erling Smørgrav 	/* if the cache reply dp equals a validation anchor or msg has DS,
1320b7579f77SDag-Erling Smørgrav 	 * then DNSSEC RRSIGs are expected in the reply */
1321b7579f77SDag-Erling Smørgrav 	iq->dnssec_expected = iter_indicates_dnssec(qstate->env, iq->dp,
1322b7579f77SDag-Erling Smørgrav 		iq->deleg_msg, iq->qchase.qclass);
1323b7579f77SDag-Erling Smørgrav 
1324b7579f77SDag-Erling Smørgrav 	/* If the RD flag wasn't set, then we just finish with the
1325b7579f77SDag-Erling Smørgrav 	 * cached referral as the response. */
1326b7579f77SDag-Erling Smørgrav 	if(!(qstate->query_flags & BIT_RD)) {
1327b7579f77SDag-Erling Smørgrav 		iq->response = iq->deleg_msg;
132817d15b25SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO && iq->response)
1329b7579f77SDag-Erling Smørgrav 			log_dns_msg("no RD requested, using delegation msg",
1330b7579f77SDag-Erling Smørgrav 				&iq->response->qinfo, iq->response->rep);
1331b7579f77SDag-Erling Smørgrav 		if(qstate->reply_origin)
1332b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin, NULL, 0, qstate->region);
1333b7579f77SDag-Erling Smørgrav 		return final_state(iq);
1334b7579f77SDag-Erling Smørgrav 	}
1335b7579f77SDag-Erling Smørgrav 	/* After this point, unset the RD flag -- this query is going to
1336b7579f77SDag-Erling Smørgrav 	 * be sent to an auth. server. */
1337b7579f77SDag-Erling Smørgrav 	iq->chase_flags &= ~BIT_RD;
1338b7579f77SDag-Erling Smørgrav 
1339b7579f77SDag-Erling Smørgrav 	/* if dnssec expected, fetch key for the trust-anchor or cached-DS */
1340b7579f77SDag-Erling Smørgrav 	if(iq->dnssec_expected && qstate->env->cfg->prefetch_key &&
1341b7579f77SDag-Erling Smørgrav 		!(qstate->query_flags&BIT_CD)) {
1342b7579f77SDag-Erling Smørgrav 		generate_dnskey_prefetch(qstate, iq, id);
1343b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
1344b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
1345b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
1346b7579f77SDag-Erling Smørgrav 	}
1347b7579f77SDag-Erling Smørgrav 
1348b7579f77SDag-Erling Smørgrav 	/* Jump to the next state. */
1349b7579f77SDag-Erling Smørgrav 	return next_state(iq, QUERYTARGETS_STATE);
1350b7579f77SDag-Erling Smørgrav }
1351b7579f77SDag-Erling Smørgrav 
1352b7579f77SDag-Erling Smørgrav /**
1353b7579f77SDag-Erling Smørgrav  * Given a basic query, generate a parent-side "target" query.
1354b7579f77SDag-Erling Smørgrav  * These are subordinate queries for missing delegation point target addresses,
1355b7579f77SDag-Erling Smørgrav  * for which only the parent of the delegation provides correct IP addresses.
1356b7579f77SDag-Erling Smørgrav  *
1357b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1358b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1359b7579f77SDag-Erling Smørgrav  * @param id: module id.
1360b7579f77SDag-Erling Smørgrav  * @param name: target qname.
1361b7579f77SDag-Erling Smørgrav  * @param namelen: target qname length.
1362b7579f77SDag-Erling Smørgrav  * @param qtype: target qtype (either A or AAAA).
1363b7579f77SDag-Erling Smørgrav  * @param qclass: target qclass.
1364b7579f77SDag-Erling Smørgrav  * @return true on success, false on failure.
1365b7579f77SDag-Erling Smørgrav  */
1366b7579f77SDag-Erling Smørgrav static int
1367b7579f77SDag-Erling Smørgrav generate_parentside_target_query(struct module_qstate* qstate,
1368b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq, int id, uint8_t* name, size_t namelen,
1369b7579f77SDag-Erling Smørgrav 	uint16_t qtype, uint16_t qclass)
1370b7579f77SDag-Erling Smørgrav {
1371b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1372b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(name, namelen, qtype, qclass, qstate,
1373b7579f77SDag-Erling Smørgrav 		id, iq, INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0))
1374b7579f77SDag-Erling Smørgrav 		return 0;
1375b7579f77SDag-Erling Smørgrav 	if(subq) {
1376b7579f77SDag-Erling Smørgrav 		struct iter_qstate* subiq =
1377b7579f77SDag-Erling Smørgrav 			(struct iter_qstate*)subq->minfo[id];
1378b7579f77SDag-Erling Smørgrav 		/* blacklist the cache - we want to fetch parent stuff */
1379b7579f77SDag-Erling Smørgrav 		sock_list_insert(&subq->blacklist, NULL, 0, subq->region);
1380b7579f77SDag-Erling Smørgrav 		subiq->query_for_pside_glue = 1;
1381b7579f77SDag-Erling Smørgrav 		if(dname_subdomain_c(name, iq->dp->name)) {
1382b7579f77SDag-Erling Smørgrav 			subiq->dp = delegpt_copy(iq->dp, subq->region);
1383b7579f77SDag-Erling Smørgrav 			subiq->dnssec_expected = iter_indicates_dnssec(
1384b7579f77SDag-Erling Smørgrav 				qstate->env, subiq->dp, NULL,
1385b7579f77SDag-Erling Smørgrav 				subq->qinfo.qclass);
1386b7579f77SDag-Erling Smørgrav 			subiq->refetch_glue = 1;
1387b7579f77SDag-Erling Smørgrav 		} else {
1388b7579f77SDag-Erling Smørgrav 			subiq->dp = dns_cache_find_delegation(qstate->env,
1389b7579f77SDag-Erling Smørgrav 				name, namelen, qtype, qclass, subq->region,
1390b7579f77SDag-Erling Smørgrav 				&subiq->deleg_msg,
1391b7579f77SDag-Erling Smørgrav 				*qstate->env->now+subq->prefetch_leeway);
1392b7579f77SDag-Erling Smørgrav 			/* if no dp, then it's from root, refetch unneeded */
1393b7579f77SDag-Erling Smørgrav 			if(subiq->dp) {
1394b7579f77SDag-Erling Smørgrav 				subiq->dnssec_expected = iter_indicates_dnssec(
1395b7579f77SDag-Erling Smørgrav 					qstate->env, subiq->dp, NULL,
1396b7579f77SDag-Erling Smørgrav 					subq->qinfo.qclass);
1397b7579f77SDag-Erling Smørgrav 				subiq->refetch_glue = 1;
1398b7579f77SDag-Erling Smørgrav 			}
1399b7579f77SDag-Erling Smørgrav 		}
1400b7579f77SDag-Erling Smørgrav 	}
1401b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_QUERY, "new pside target", name, qtype, qclass);
1402b7579f77SDag-Erling Smørgrav 	return 1;
1403b7579f77SDag-Erling Smørgrav }
1404b7579f77SDag-Erling Smørgrav 
1405b7579f77SDag-Erling Smørgrav /**
1406b7579f77SDag-Erling Smørgrav  * Given a basic query, generate a "target" query. These are subordinate
1407b7579f77SDag-Erling Smørgrav  * queries for missing delegation point target addresses.
1408b7579f77SDag-Erling Smørgrav  *
1409b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1410b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1411b7579f77SDag-Erling Smørgrav  * @param id: module id.
1412b7579f77SDag-Erling Smørgrav  * @param name: target qname.
1413b7579f77SDag-Erling Smørgrav  * @param namelen: target qname length.
1414b7579f77SDag-Erling Smørgrav  * @param qtype: target qtype (either A or AAAA).
1415b7579f77SDag-Erling Smørgrav  * @param qclass: target qclass.
1416b7579f77SDag-Erling Smørgrav  * @return true on success, false on failure.
1417b7579f77SDag-Erling Smørgrav  */
1418b7579f77SDag-Erling Smørgrav static int
1419b7579f77SDag-Erling Smørgrav generate_target_query(struct module_qstate* qstate, struct iter_qstate* iq,
1420b7579f77SDag-Erling Smørgrav         int id, uint8_t* name, size_t namelen, uint16_t qtype, uint16_t qclass)
1421b7579f77SDag-Erling Smørgrav {
1422b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
1423b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(name, namelen, qtype, qclass, qstate,
1424b7579f77SDag-Erling Smørgrav 		id, iq, INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0))
1425b7579f77SDag-Erling Smørgrav 		return 0;
1426b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_QUERY, "new target", name, qtype, qclass);
1427b7579f77SDag-Erling Smørgrav 	return 1;
1428b7579f77SDag-Erling Smørgrav }
1429b7579f77SDag-Erling Smørgrav 
1430b7579f77SDag-Erling Smørgrav /**
1431b7579f77SDag-Erling Smørgrav  * Given an event at a certain state, generate zero or more target queries
1432b7579f77SDag-Erling Smørgrav  * for it's current delegation point.
1433b7579f77SDag-Erling Smørgrav  *
1434b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1435b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1436b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
1437b7579f77SDag-Erling Smørgrav  * @param id: module id.
1438b7579f77SDag-Erling Smørgrav  * @param maxtargets: The maximum number of targets to query for.
1439b7579f77SDag-Erling Smørgrav  *	if it is negative, there is no maximum number of targets.
1440b7579f77SDag-Erling Smørgrav  * @param num: returns the number of queries generated and processed,
1441b7579f77SDag-Erling Smørgrav  *	which may be zero if there were no missing targets.
1442b7579f77SDag-Erling Smørgrav  * @return false on error.
1443b7579f77SDag-Erling Smørgrav  */
1444b7579f77SDag-Erling Smørgrav static int
1445b7579f77SDag-Erling Smørgrav query_for_targets(struct module_qstate* qstate, struct iter_qstate* iq,
1446b7579f77SDag-Erling Smørgrav         struct iter_env* ie, int id, int maxtargets, int* num)
1447b7579f77SDag-Erling Smørgrav {
1448b7579f77SDag-Erling Smørgrav 	int query_count = 0;
1449b7579f77SDag-Erling Smørgrav 	struct delegpt_ns* ns;
1450b7579f77SDag-Erling Smørgrav 	int missing;
1451b7579f77SDag-Erling Smørgrav 	int toget = 0;
1452b7579f77SDag-Erling Smørgrav 
1453b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth)
1454b7579f77SDag-Erling Smørgrav 		return 0;
145552df462fSXin LI 	if(iq->depth > 0 && iq->target_count &&
145652df462fSXin LI 		iq->target_count[1] > MAX_TARGET_COUNT) {
14576480faa8SDag-Erling Smørgrav 		char s[LDNS_MAX_DOMAINLEN+1];
14586480faa8SDag-Erling Smørgrav 		dname_str(qstate->qinfo.qname, s);
14596480faa8SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request %s has exceeded the maximum "
14606480faa8SDag-Erling Smørgrav 			"number of glue fetches %d", s, iq->target_count[1]);
146152df462fSXin LI 		return 0;
146252df462fSXin LI 	}
1463b7579f77SDag-Erling Smørgrav 
1464b7579f77SDag-Erling Smørgrav 	iter_mark_cycle_targets(qstate, iq->dp);
1465b7579f77SDag-Erling Smørgrav 	missing = (int)delegpt_count_missing_targets(iq->dp);
1466b7579f77SDag-Erling Smørgrav 	log_assert(maxtargets != 0); /* that would not be useful */
1467b7579f77SDag-Erling Smørgrav 
1468b7579f77SDag-Erling Smørgrav 	/* Generate target requests. Basically, any missing targets
1469b7579f77SDag-Erling Smørgrav 	 * are queried for here, regardless if it is necessary to do
1470b7579f77SDag-Erling Smørgrav 	 * so to continue processing. */
1471b7579f77SDag-Erling Smørgrav 	if(maxtargets < 0 || maxtargets > missing)
1472b7579f77SDag-Erling Smørgrav 		toget = missing;
1473b7579f77SDag-Erling Smørgrav 	else	toget = maxtargets;
1474b7579f77SDag-Erling Smørgrav 	if(toget == 0) {
1475b7579f77SDag-Erling Smørgrav 		*num = 0;
1476b7579f77SDag-Erling Smørgrav 		return 1;
1477b7579f77SDag-Erling Smørgrav 	}
1478b7579f77SDag-Erling Smørgrav 	/* select 'toget' items from the total of 'missing' items */
1479b7579f77SDag-Erling Smørgrav 	log_assert(toget <= missing);
1480b7579f77SDag-Erling Smørgrav 
1481b7579f77SDag-Erling Smørgrav 	/* loop over missing targets */
1482b7579f77SDag-Erling Smørgrav 	for(ns = iq->dp->nslist; ns; ns = ns->next) {
1483b7579f77SDag-Erling Smørgrav 		if(ns->resolved)
1484b7579f77SDag-Erling Smørgrav 			continue;
1485b7579f77SDag-Erling Smørgrav 
1486b7579f77SDag-Erling Smørgrav 		/* randomly select this item with probability toget/missing */
1487b7579f77SDag-Erling Smørgrav 		if(!iter_ns_probability(qstate->env->rnd, toget, missing)) {
1488b7579f77SDag-Erling Smørgrav 			/* do not select this one, next; select toget number
1489b7579f77SDag-Erling Smørgrav 			 * of items from a list one less in size */
1490b7579f77SDag-Erling Smørgrav 			missing --;
1491b7579f77SDag-Erling Smørgrav 			continue;
1492b7579f77SDag-Erling Smørgrav 		}
1493b7579f77SDag-Erling Smørgrav 
1494b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv6 && !ns->got6) {
1495b7579f77SDag-Erling Smørgrav 			/* Send the AAAA request. */
1496b7579f77SDag-Erling Smørgrav 			if(!generate_target_query(qstate, iq, id,
1497b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
1498b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_AAAA, iq->qchase.qclass)) {
1499b7579f77SDag-Erling Smørgrav 				*num = query_count;
1500b7579f77SDag-Erling Smørgrav 				if(query_count > 0)
1501b7579f77SDag-Erling Smørgrav 					qstate->ext_state[id] = module_wait_subquery;
1502b7579f77SDag-Erling Smørgrav 				return 0;
1503b7579f77SDag-Erling Smørgrav 			}
1504b7579f77SDag-Erling Smørgrav 			query_count++;
1505b7579f77SDag-Erling Smørgrav 		}
1506b7579f77SDag-Erling Smørgrav 		/* Send the A request. */
1507b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv4 && !ns->got4) {
1508b7579f77SDag-Erling Smørgrav 			if(!generate_target_query(qstate, iq, id,
1509b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
1510b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_A, iq->qchase.qclass)) {
1511b7579f77SDag-Erling Smørgrav 				*num = query_count;
1512b7579f77SDag-Erling Smørgrav 				if(query_count > 0)
1513b7579f77SDag-Erling Smørgrav 					qstate->ext_state[id] = module_wait_subquery;
1514b7579f77SDag-Erling Smørgrav 				return 0;
1515b7579f77SDag-Erling Smørgrav 			}
1516b7579f77SDag-Erling Smørgrav 			query_count++;
1517b7579f77SDag-Erling Smørgrav 		}
1518b7579f77SDag-Erling Smørgrav 
1519b7579f77SDag-Erling Smørgrav 		/* mark this target as in progress. */
1520b7579f77SDag-Erling Smørgrav 		ns->resolved = 1;
1521b7579f77SDag-Erling Smørgrav 		missing--;
1522b7579f77SDag-Erling Smørgrav 		toget--;
1523b7579f77SDag-Erling Smørgrav 		if(toget == 0)
1524b7579f77SDag-Erling Smørgrav 			break;
1525b7579f77SDag-Erling Smørgrav 	}
1526b7579f77SDag-Erling Smørgrav 	*num = query_count;
1527b7579f77SDag-Erling Smørgrav 	if(query_count > 0)
1528b7579f77SDag-Erling Smørgrav 		qstate->ext_state[id] = module_wait_subquery;
1529b7579f77SDag-Erling Smørgrav 
1530b7579f77SDag-Erling Smørgrav 	return 1;
1531b7579f77SDag-Erling Smørgrav }
1532b7579f77SDag-Erling Smørgrav 
153317d15b25SDag-Erling Smørgrav /** see if last resort is possible - does config allow queries to parent */
153417d15b25SDag-Erling Smørgrav static int
153517d15b25SDag-Erling Smørgrav can_have_last_resort(struct module_env* env, struct delegpt* dp,
153617d15b25SDag-Erling Smørgrav 	struct iter_qstate* iq)
153717d15b25SDag-Erling Smørgrav {
153817d15b25SDag-Erling Smørgrav 	struct delegpt* fwddp;
153917d15b25SDag-Erling Smørgrav 	struct iter_hints_stub* stub;
154017d15b25SDag-Erling Smørgrav 	/* do not process a last resort (the parent side) if a stub
154117d15b25SDag-Erling Smørgrav 	 * or forward is configured, because we do not want to go 'above'
154217d15b25SDag-Erling Smørgrav 	 * the configured servers */
154317d15b25SDag-Erling Smørgrav 	if(!dname_is_root(dp->name) && (stub = (struct iter_hints_stub*)
154417d15b25SDag-Erling Smørgrav 		name_tree_find(&env->hints->tree, dp->name, dp->namelen,
154517d15b25SDag-Erling Smørgrav 		dp->namelabs, iq->qchase.qclass)) &&
154617d15b25SDag-Erling Smørgrav 		/* has_parent side is turned off for stub_first, where we
154717d15b25SDag-Erling Smørgrav 		 * are allowed to go to the parent */
154817d15b25SDag-Erling Smørgrav 		stub->dp->has_parent_side_NS) {
154917d15b25SDag-Erling Smørgrav 		verbose(VERB_QUERY, "configured stub servers failed -- returning SERVFAIL");
155017d15b25SDag-Erling Smørgrav 		return 0;
155117d15b25SDag-Erling Smørgrav 	}
155217d15b25SDag-Erling Smørgrav 	if((fwddp = forwards_find(env->fwds, dp->name, iq->qchase.qclass)) &&
155317d15b25SDag-Erling Smørgrav 		/* has_parent_side is turned off for forward_first, where
155417d15b25SDag-Erling Smørgrav 		 * we are allowed to go to the parent */
155517d15b25SDag-Erling Smørgrav 		fwddp->has_parent_side_NS) {
155617d15b25SDag-Erling Smørgrav 		verbose(VERB_QUERY, "configured forward servers failed -- returning SERVFAIL");
155717d15b25SDag-Erling Smørgrav 		return 0;
155817d15b25SDag-Erling Smørgrav 	}
155917d15b25SDag-Erling Smørgrav 	return 1;
156017d15b25SDag-Erling Smørgrav }
156117d15b25SDag-Erling Smørgrav 
1562b7579f77SDag-Erling Smørgrav /**
1563b7579f77SDag-Erling Smørgrav  * Called by processQueryTargets when it would like extra targets to query
1564b7579f77SDag-Erling Smørgrav  * but it seems to be out of options.  At last resort some less appealing
1565b7579f77SDag-Erling Smørgrav  * options are explored.  If there are no more options, the result is SERVFAIL
1566b7579f77SDag-Erling Smørgrav  *
1567b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1568b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1569b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
1570b7579f77SDag-Erling Smørgrav  * @param id: module id.
1571b7579f77SDag-Erling Smørgrav  * @return true if the event requires more request processing immediately,
1572b7579f77SDag-Erling Smørgrav  *         false if not.
1573b7579f77SDag-Erling Smørgrav  */
1574b7579f77SDag-Erling Smørgrav static int
1575b7579f77SDag-Erling Smørgrav processLastResort(struct module_qstate* qstate, struct iter_qstate* iq,
1576b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
1577b7579f77SDag-Erling Smørgrav {
1578b7579f77SDag-Erling Smørgrav 	struct delegpt_ns* ns;
1579b7579f77SDag-Erling Smørgrav 	int query_count = 0;
1580b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "No more query targets, attempting last resort");
1581b7579f77SDag-Erling Smørgrav 	log_assert(iq->dp);
1582b7579f77SDag-Erling Smørgrav 
158317d15b25SDag-Erling Smørgrav 	if(!can_have_last_resort(qstate->env, iq->dp, iq)) {
158417d15b25SDag-Erling Smørgrav 		/* fail -- no more targets, no more hope of targets, no hope
158517d15b25SDag-Erling Smørgrav 		 * of a response. */
158617d15b25SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
158717d15b25SDag-Erling Smørgrav 	}
15888ed2b524SDag-Erling Smørgrav 	if(!iq->dp->has_parent_side_NS && dname_is_root(iq->dp->name)) {
15898ed2b524SDag-Erling Smørgrav 		struct delegpt* p = hints_lookup_root(qstate->env->hints,
15908ed2b524SDag-Erling Smørgrav 			iq->qchase.qclass);
15918ed2b524SDag-Erling Smørgrav 		if(p) {
15928ed2b524SDag-Erling Smørgrav 			struct delegpt_ns* ns;
15938ed2b524SDag-Erling Smørgrav 			struct delegpt_addr* a;
15948ed2b524SDag-Erling Smørgrav 			iq->chase_flags &= ~BIT_RD; /* go to authorities */
15958ed2b524SDag-Erling Smørgrav 			for(ns = p->nslist; ns; ns=ns->next) {
15968ed2b524SDag-Erling Smørgrav 				(void)delegpt_add_ns(iq->dp, qstate->region,
159717d15b25SDag-Erling Smørgrav 					ns->name, ns->lame);
15988ed2b524SDag-Erling Smørgrav 			}
15998ed2b524SDag-Erling Smørgrav 			for(a = p->target_list; a; a=a->next_target) {
16008ed2b524SDag-Erling Smørgrav 				(void)delegpt_add_addr(iq->dp, qstate->region,
16018ed2b524SDag-Erling Smørgrav 					&a->addr, a->addrlen, a->bogus,
16028ed2b524SDag-Erling Smørgrav 					a->lame);
16038ed2b524SDag-Erling Smørgrav 			}
16048ed2b524SDag-Erling Smørgrav 		}
16058ed2b524SDag-Erling Smørgrav 		iq->dp->has_parent_side_NS = 1;
16068ed2b524SDag-Erling Smørgrav 	} else if(!iq->dp->has_parent_side_NS) {
1607b7579f77SDag-Erling Smørgrav 		if(!iter_lookup_parent_NS_from_cache(qstate->env, iq->dp,
1608b7579f77SDag-Erling Smørgrav 			qstate->region, &qstate->qinfo)
1609b7579f77SDag-Erling Smørgrav 			|| !iq->dp->has_parent_side_NS) {
1610b7579f77SDag-Erling Smørgrav 			/* if: malloc failure in lookup go up to try */
1611b7579f77SDag-Erling Smørgrav 			/* if: no parent NS in cache - go up one level */
1612b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "try to grab parent NS");
1613b7579f77SDag-Erling Smørgrav 			iq->store_parent_NS = iq->dp;
16148ed2b524SDag-Erling Smørgrav 			iq->chase_flags &= ~BIT_RD; /* go to authorities */
1615b7579f77SDag-Erling Smørgrav 			iq->deleg_msg = NULL;
1616b7579f77SDag-Erling Smørgrav 			iq->refetch_glue = 1;
1617b7579f77SDag-Erling Smørgrav 			iq->query_restart_count++;
1618b7579f77SDag-Erling Smørgrav 			iq->sent_count = 0;
161905ab2901SDag-Erling Smørgrav 			if(qstate->env->cfg->qname_minimisation)
162005ab2901SDag-Erling Smørgrav 				iq->minimisation_state = INIT_MINIMISE_STATE;
1621b7579f77SDag-Erling Smørgrav 			return next_state(iq, INIT_REQUEST_STATE);
1622b7579f77SDag-Erling Smørgrav 		}
1623b7579f77SDag-Erling Smørgrav 	}
1624b7579f77SDag-Erling Smørgrav 	/* see if that makes new names available */
1625b7579f77SDag-Erling Smørgrav 	if(!cache_fill_missing(qstate->env, iq->qchase.qclass,
1626b7579f77SDag-Erling Smørgrav 		qstate->region, iq->dp))
1627b7579f77SDag-Erling Smørgrav 		log_err("out of memory in cache_fill_missing");
1628b7579f77SDag-Erling Smørgrav 	if(iq->dp->usable_list) {
1629b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "try parent-side-name, w. glue from cache");
1630b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
1631b7579f77SDag-Erling Smørgrav 	}
1632b7579f77SDag-Erling Smørgrav 	/* try to fill out parent glue from cache */
1633b7579f77SDag-Erling Smørgrav 	if(iter_lookup_parent_glue_from_cache(qstate->env, iq->dp,
1634b7579f77SDag-Erling Smørgrav 		qstate->region, &qstate->qinfo)) {
1635b7579f77SDag-Erling Smørgrav 		/* got parent stuff from cache, see if we can continue */
1636b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "try parent-side glue from cache");
1637b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
1638b7579f77SDag-Erling Smørgrav 	}
1639b7579f77SDag-Erling Smørgrav 	/* query for an extra name added by the parent-NS record */
1640b7579f77SDag-Erling Smørgrav 	if(delegpt_count_missing_targets(iq->dp) > 0) {
1641b7579f77SDag-Erling Smørgrav 		int qs = 0;
1642b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "try parent-side target name");
1643b7579f77SDag-Erling Smørgrav 		if(!query_for_targets(qstate, iq, ie, id, 1, &qs)) {
1644b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1645b7579f77SDag-Erling Smørgrav 		}
1646b7579f77SDag-Erling Smørgrav 		iq->num_target_queries += qs;
164752df462fSXin LI 		target_count_increase(iq, qs);
1648b7579f77SDag-Erling Smørgrav 		if(qs != 0) {
1649b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_subquery;
1650b7579f77SDag-Erling Smørgrav 			return 0; /* and wait for them */
1651b7579f77SDag-Erling Smørgrav 		}
1652b7579f77SDag-Erling Smørgrav 	}
1653b7579f77SDag-Erling Smørgrav 	if(iq->depth == ie->max_dependency_depth) {
1654b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "maxdepth and need more nameservers, fail");
1655b7579f77SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
1656b7579f77SDag-Erling Smørgrav 	}
165752df462fSXin LI 	if(iq->depth > 0 && iq->target_count &&
165852df462fSXin LI 		iq->target_count[1] > MAX_TARGET_COUNT) {
16596480faa8SDag-Erling Smørgrav 		char s[LDNS_MAX_DOMAINLEN+1];
16606480faa8SDag-Erling Smørgrav 		dname_str(qstate->qinfo.qname, s);
16616480faa8SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request %s has exceeded the maximum "
16626480faa8SDag-Erling Smørgrav 			"number of glue fetches %d", s, iq->target_count[1]);
166352df462fSXin LI 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
166452df462fSXin LI 	}
1665b7579f77SDag-Erling Smørgrav 	/* mark cycle targets for parent-side lookups */
1666b7579f77SDag-Erling Smørgrav 	iter_mark_pside_cycle_targets(qstate, iq->dp);
1667b7579f77SDag-Erling Smørgrav 	/* see if we can issue queries to get nameserver addresses */
1668b7579f77SDag-Erling Smørgrav 	/* this lookup is not randomized, but sequential. */
1669b7579f77SDag-Erling Smørgrav 	for(ns = iq->dp->nslist; ns; ns = ns->next) {
1670b7579f77SDag-Erling Smørgrav 		/* query for parent-side A and AAAA for nameservers */
1671b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv6 && !ns->done_pside6) {
1672b7579f77SDag-Erling Smørgrav 			/* Send the AAAA request. */
1673b7579f77SDag-Erling Smørgrav 			if(!generate_parentside_target_query(qstate, iq, id,
1674b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
1675b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_AAAA, iq->qchase.qclass))
1676b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1677b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
1678b7579f77SDag-Erling Smørgrav 			ns->done_pside6 = 1;
1679b7579f77SDag-Erling Smørgrav 			query_count++;
1680b7579f77SDag-Erling Smørgrav 		}
1681b7579f77SDag-Erling Smørgrav 		if(ie->supports_ipv4 && !ns->done_pside4) {
1682b7579f77SDag-Erling Smørgrav 			/* Send the A request. */
1683b7579f77SDag-Erling Smørgrav 			if(!generate_parentside_target_query(qstate, iq, id,
1684b7579f77SDag-Erling Smørgrav 				ns->name, ns->namelen,
1685b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_A, iq->qchase.qclass))
1686b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
1687b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
1688b7579f77SDag-Erling Smørgrav 			ns->done_pside4 = 1;
1689b7579f77SDag-Erling Smørgrav 			query_count++;
1690b7579f77SDag-Erling Smørgrav 		}
1691b7579f77SDag-Erling Smørgrav 		if(query_count != 0) { /* suspend to await results */
1692b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "try parent-side glue lookup");
1693b7579f77SDag-Erling Smørgrav 			iq->num_target_queries += query_count;
169452df462fSXin LI 			target_count_increase(iq, query_count);
1695b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_subquery;
1696b7579f77SDag-Erling Smørgrav 			return 0;
1697b7579f77SDag-Erling Smørgrav 		}
1698b7579f77SDag-Erling Smørgrav 	}
1699b7579f77SDag-Erling Smørgrav 
1700b7579f77SDag-Erling Smørgrav 	/* if this was a parent-side glue query itself, then store that
1701b7579f77SDag-Erling Smørgrav 	 * failure in cache. */
1702b7579f77SDag-Erling Smørgrav 	if(iq->query_for_pside_glue && !iq->pside_glue)
1703b7579f77SDag-Erling Smørgrav 		iter_store_parentside_neg(qstate->env, &qstate->qinfo,
1704b7579f77SDag-Erling Smørgrav 			iq->deleg_msg?iq->deleg_msg->rep:
1705b7579f77SDag-Erling Smørgrav 			(iq->response?iq->response->rep:NULL));
1706b7579f77SDag-Erling Smørgrav 
1707b7579f77SDag-Erling Smørgrav 	verbose(VERB_QUERY, "out of query targets -- returning SERVFAIL");
1708b7579f77SDag-Erling Smørgrav 	/* fail -- no more targets, no more hope of targets, no hope
1709b7579f77SDag-Erling Smørgrav 	 * of a response. */
1710b7579f77SDag-Erling Smørgrav 	return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
1711b7579f77SDag-Erling Smørgrav }
1712b7579f77SDag-Erling Smørgrav 
1713b7579f77SDag-Erling Smørgrav /**
1714b7579f77SDag-Erling Smørgrav  * Try to find the NS record set that will resolve a qtype DS query. Due
1715b7579f77SDag-Erling Smørgrav  * to grandparent/grandchild reasons we did not get a proper lookup right
1716b7579f77SDag-Erling Smørgrav  * away.  We need to create type NS queries until we get the right parent
1717b7579f77SDag-Erling Smørgrav  * for this lookup.  We remove labels from the query to find the right point.
1718b7579f77SDag-Erling Smørgrav  * If we end up at the old dp name, then there is no solution.
1719b7579f77SDag-Erling Smørgrav  *
1720b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1721b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1722b7579f77SDag-Erling Smørgrav  * @param id: module id.
1723b7579f77SDag-Erling Smørgrav  * @return true if the event requires more immediate processing, false if
1724b7579f77SDag-Erling Smørgrav  *         not. This is generally only true when forwarding the request to
1725b7579f77SDag-Erling Smørgrav  *         the final state (i.e., on answer).
1726b7579f77SDag-Erling Smørgrav  */
1727b7579f77SDag-Erling Smørgrav static int
17288ed2b524SDag-Erling Smørgrav processDSNSFind(struct module_qstate* qstate, struct iter_qstate* iq, int id)
1729b7579f77SDag-Erling Smørgrav {
1730b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq = NULL;
1731b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "processDSNSFind");
1732b7579f77SDag-Erling Smørgrav 
1733b7579f77SDag-Erling Smørgrav 	if(!iq->dsns_point) {
1734b7579f77SDag-Erling Smørgrav 		/* initialize */
1735b7579f77SDag-Erling Smørgrav 		iq->dsns_point = iq->qchase.qname;
1736b7579f77SDag-Erling Smørgrav 		iq->dsns_point_len = iq->qchase.qname_len;
1737b7579f77SDag-Erling Smørgrav 	}
1738b7579f77SDag-Erling Smørgrav 	/* robustcheck for internal error: we are not underneath the dp */
1739b7579f77SDag-Erling Smørgrav 	if(!dname_subdomain_c(iq->dsns_point, iq->dp->name)) {
1740b7579f77SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
1741b7579f77SDag-Erling Smørgrav 	}
1742b7579f77SDag-Erling Smørgrav 
1743b7579f77SDag-Erling Smørgrav 	/* go up one (more) step, until we hit the dp, if so, end */
1744b7579f77SDag-Erling Smørgrav 	dname_remove_label(&iq->dsns_point, &iq->dsns_point_len);
1745b7579f77SDag-Erling Smørgrav 	if(query_dname_compare(iq->dsns_point, iq->dp->name) == 0) {
1746b7579f77SDag-Erling Smørgrav 		/* there was no inbetween nameserver, use the old delegation
1747b7579f77SDag-Erling Smørgrav 		 * point again.  And this time, because dsns_point is nonNULL
1748b7579f77SDag-Erling Smørgrav 		 * we are going to accept the (bad) result */
1749b7579f77SDag-Erling Smørgrav 		iq->state = QUERYTARGETS_STATE;
1750b7579f77SDag-Erling Smørgrav 		return 1;
1751b7579f77SDag-Erling Smørgrav 	}
1752b7579f77SDag-Erling Smørgrav 	iq->state = DSNS_FIND_STATE;
1753b7579f77SDag-Erling Smørgrav 
1754b7579f77SDag-Erling Smørgrav 	/* spawn NS lookup (validation not needed, this is for DS lookup) */
1755b7579f77SDag-Erling Smørgrav 	log_nametypeclass(VERB_ALGO, "fetch nameservers",
1756b7579f77SDag-Erling Smørgrav 		iq->dsns_point, LDNS_RR_TYPE_NS, iq->qchase.qclass);
1757b7579f77SDag-Erling Smørgrav 	if(!generate_sub_request(iq->dsns_point, iq->dsns_point_len,
1758b7579f77SDag-Erling Smørgrav 		LDNS_RR_TYPE_NS, iq->qchase.qclass, qstate, id, iq,
1759b7579f77SDag-Erling Smørgrav 		INIT_REQUEST_STATE, FINISHED_STATE, &subq, 0)) {
1760b7579f77SDag-Erling Smørgrav 		return error_response_cache(qstate, id, LDNS_RCODE_SERVFAIL);
1761b7579f77SDag-Erling Smørgrav 	}
1762b7579f77SDag-Erling Smørgrav 
1763b7579f77SDag-Erling Smørgrav 	return 0;
1764b7579f77SDag-Erling Smørgrav }
1765b7579f77SDag-Erling Smørgrav 
1766b7579f77SDag-Erling Smørgrav /**
1767b7579f77SDag-Erling Smørgrav  * This is the request event state where the request will be sent to one of
1768b7579f77SDag-Erling Smørgrav  * its current query targets. This state also handles issuing target lookup
1769b7579f77SDag-Erling Smørgrav  * queries for missing target IP addresses. Queries typically iterate on
1770b7579f77SDag-Erling Smørgrav  * this state, both when they are just trying different targets for a given
1771b7579f77SDag-Erling Smørgrav  * delegation point, and when they change delegation points. This state
1772b7579f77SDag-Erling Smørgrav  * roughly corresponds to RFC 1034 algorithm steps 3 and 4.
1773b7579f77SDag-Erling Smørgrav  *
1774b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
1775b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
1776b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
1777b7579f77SDag-Erling Smørgrav  * @param id: module id.
1778b7579f77SDag-Erling Smørgrav  * @return true if the event requires more request processing immediately,
1779b7579f77SDag-Erling Smørgrav  *         false if not. This state only returns true when it is generating
1780b7579f77SDag-Erling Smørgrav  *         a SERVFAIL response because the query has hit a dead end.
1781b7579f77SDag-Erling Smørgrav  */
1782b7579f77SDag-Erling Smørgrav static int
1783b7579f77SDag-Erling Smørgrav processQueryTargets(struct module_qstate* qstate, struct iter_qstate* iq,
1784b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
1785b7579f77SDag-Erling Smørgrav {
1786b7579f77SDag-Erling Smørgrav 	int tf_policy;
1787b7579f77SDag-Erling Smørgrav 	struct delegpt_addr* target;
1788b7579f77SDag-Erling Smørgrav 	struct outbound_entry* outq;
1789*e2d15004SDag-Erling Smørgrav 	/* EDNS options to set on outgoing packet */
1790*e2d15004SDag-Erling Smørgrav 	struct edns_option* opt_list = NULL;
1791b7579f77SDag-Erling Smørgrav 
1792b7579f77SDag-Erling Smørgrav 	/* NOTE: a request will encounter this state for each target it
1793b7579f77SDag-Erling Smørgrav 	 * needs to send a query to. That is, at least one per referral,
1794b7579f77SDag-Erling Smørgrav 	 * more if some targets timeout or return throwaway answers. */
1795b7579f77SDag-Erling Smørgrav 
1796b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "processQueryTargets:", &qstate->qinfo);
1797b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "processQueryTargets: targetqueries %d, "
1798b7579f77SDag-Erling Smørgrav 		"currentqueries %d sentcount %d", iq->num_target_queries,
1799b7579f77SDag-Erling Smørgrav 		iq->num_current_queries, iq->sent_count);
1800b7579f77SDag-Erling Smørgrav 
1801b7579f77SDag-Erling Smørgrav 	/* Make sure that we haven't run away */
1802b7579f77SDag-Erling Smørgrav 	/* FIXME: is this check even necessary? */
1803b7579f77SDag-Erling Smørgrav 	if(iq->referral_count > MAX_REFERRAL_COUNT) {
1804b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum "
1805b7579f77SDag-Erling Smørgrav 			"number of referrrals with %d", iq->referral_count);
1806b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1807b7579f77SDag-Erling Smørgrav 	}
1808b7579f77SDag-Erling Smørgrav 	if(iq->sent_count > MAX_SENT_COUNT) {
1809b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "request has exceeded the maximum "
1810b7579f77SDag-Erling Smørgrav 			"number of sends with %d", iq->sent_count);
1811b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1812b7579f77SDag-Erling Smørgrav 	}
1813b7579f77SDag-Erling Smørgrav 
1814b7579f77SDag-Erling Smørgrav 	/* Make sure we have a delegation point, otherwise priming failed
1815b7579f77SDag-Erling Smørgrav 	 * or another failure occurred */
1816b7579f77SDag-Erling Smørgrav 	if(!iq->dp) {
1817b7579f77SDag-Erling Smørgrav 		verbose(VERB_QUERY, "Failed to get a delegation, giving up");
1818b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1819b7579f77SDag-Erling Smørgrav 	}
1820b7579f77SDag-Erling Smørgrav 	if(!ie->supports_ipv6)
1821b7579f77SDag-Erling Smørgrav 		delegpt_no_ipv6(iq->dp);
1822b7579f77SDag-Erling Smørgrav 	if(!ie->supports_ipv4)
1823b7579f77SDag-Erling Smørgrav 		delegpt_no_ipv4(iq->dp);
1824b7579f77SDag-Erling Smørgrav 	delegpt_log(VERB_ALGO, iq->dp);
1825b7579f77SDag-Erling Smørgrav 
1826b7579f77SDag-Erling Smørgrav 	if(iq->num_current_queries>0) {
1827b7579f77SDag-Erling Smørgrav 		/* already busy answering a query, this restart is because
1828b7579f77SDag-Erling Smørgrav 		 * more delegpt addrs became available, wait for existing
1829b7579f77SDag-Erling Smørgrav 		 * query. */
1830b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "woke up, but wait for outstanding query");
1831b7579f77SDag-Erling Smørgrav 		qstate->ext_state[id] = module_wait_reply;
1832b7579f77SDag-Erling Smørgrav 		return 0;
1833b7579f77SDag-Erling Smørgrav 	}
1834b7579f77SDag-Erling Smørgrav 
1835b7579f77SDag-Erling Smørgrav 	tf_policy = 0;
1836b7579f77SDag-Erling Smørgrav 	/* < not <=, because although the array is large enough for <=, the
1837b7579f77SDag-Erling Smørgrav 	 * generated query will immediately be discarded due to depth and
1838b7579f77SDag-Erling Smørgrav 	 * that servfail is cached, which is not good as opportunism goes. */
1839b7579f77SDag-Erling Smørgrav 	if(iq->depth < ie->max_dependency_depth
1840b7579f77SDag-Erling Smørgrav 		&& iq->sent_count < TARGET_FETCH_STOP) {
1841b7579f77SDag-Erling Smørgrav 		tf_policy = ie->target_fetch_policy[iq->depth];
1842b7579f77SDag-Erling Smørgrav 	}
1843b7579f77SDag-Erling Smørgrav 
1844b7579f77SDag-Erling Smørgrav 	/* if in 0x20 fallback get as many targets as possible */
1845b7579f77SDag-Erling Smørgrav 	if(iq->caps_fallback) {
1846b7579f77SDag-Erling Smørgrav 		int extra = 0;
1847b7579f77SDag-Erling Smørgrav 		size_t naddr, nres, navail;
1848b7579f77SDag-Erling Smørgrav 		if(!query_for_targets(qstate, iq, ie, id, -1, &extra)) {
1849b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
1850b7579f77SDag-Erling Smørgrav 		}
1851b7579f77SDag-Erling Smørgrav 		iq->num_target_queries += extra;
185252df462fSXin LI 		target_count_increase(iq, extra);
1853b7579f77SDag-Erling Smørgrav 		if(iq->num_target_queries > 0) {
1854b7579f77SDag-Erling Smørgrav 			/* wait to get all targets, we want to try em */
1855b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "wait for all targets for fallback");
1856b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_reply;
1857b7579f77SDag-Erling Smørgrav 			return 0;
1858b7579f77SDag-Erling Smørgrav 		}
1859b7579f77SDag-Erling Smørgrav 		/* did we do enough fallback queries already? */
1860b7579f77SDag-Erling Smørgrav 		delegpt_count_addr(iq->dp, &naddr, &nres, &navail);
1861b7579f77SDag-Erling Smørgrav 		/* the current caps_server is the number of fallbacks sent.
1862b7579f77SDag-Erling Smørgrav 		 * the original query is one that matched too, so we have
1863b7579f77SDag-Erling Smørgrav 		 * caps_server+1 number of matching queries now */
1864b7579f77SDag-Erling Smørgrav 		if(iq->caps_server+1 >= naddr*3 ||
186509a3aaf3SDag-Erling Smørgrav 			iq->caps_server*2+2 >= MAX_SENT_COUNT) {
186609a3aaf3SDag-Erling Smørgrav 			/* *2 on sentcount check because ipv6 may fail */
1867b7579f77SDag-Erling Smørgrav 			/* we're done, process the response */
1868b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "0x20 fallback had %d responses "
1869b7579f77SDag-Erling Smørgrav 				"match for %d wanted, done.",
1870b7579f77SDag-Erling Smørgrav 				(int)iq->caps_server+1, (int)naddr*3);
187109a3aaf3SDag-Erling Smørgrav 			iq->response = iq->caps_response;
1872b7579f77SDag-Erling Smørgrav 			iq->caps_fallback = 0;
1873b7579f77SDag-Erling Smørgrav 			iter_dec_attempts(iq->dp, 3); /* space for fallback */
1874b7579f77SDag-Erling Smørgrav 			iq->num_current_queries++; /* RespState decrements it*/
1875b7579f77SDag-Erling Smørgrav 			iq->referral_count++; /* make sure we don't loop */
1876b7579f77SDag-Erling Smørgrav 			iq->sent_count = 0;
1877b7579f77SDag-Erling Smørgrav 			iq->state = QUERY_RESP_STATE;
1878b7579f77SDag-Erling Smørgrav 			return 1;
1879b7579f77SDag-Erling Smørgrav 		}
1880b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "0x20 fallback number %d",
1881b7579f77SDag-Erling Smørgrav 			(int)iq->caps_server);
1882b7579f77SDag-Erling Smørgrav 
1883b7579f77SDag-Erling Smørgrav 	/* if there is a policy to fetch missing targets
1884b7579f77SDag-Erling Smørgrav 	 * opportunistically, do it. we rely on the fact that once a
1885b7579f77SDag-Erling Smørgrav 	 * query (or queries) for a missing name have been issued,
1886b7579f77SDag-Erling Smørgrav 	 * they will not show up again. */
1887b7579f77SDag-Erling Smørgrav 	} else if(tf_policy != 0) {
1888b7579f77SDag-Erling Smørgrav 		int extra = 0;
1889b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "attempt to get extra %d targets",
1890b7579f77SDag-Erling Smørgrav 			tf_policy);
1891b7579f77SDag-Erling Smørgrav 		(void)query_for_targets(qstate, iq, ie, id, tf_policy, &extra);
1892b7579f77SDag-Erling Smørgrav 		/* errors ignored, these targets are not strictly necessary for
1893b7579f77SDag-Erling Smørgrav 		 * this result, we do not have to reply with SERVFAIL */
1894b7579f77SDag-Erling Smørgrav 		iq->num_target_queries += extra;
189552df462fSXin LI 		target_count_increase(iq, extra);
1896b7579f77SDag-Erling Smørgrav 	}
1897b7579f77SDag-Erling Smørgrav 
1898b7579f77SDag-Erling Smørgrav 	/* Add the current set of unused targets to our queue. */
1899b7579f77SDag-Erling Smørgrav 	delegpt_add_unused_targets(iq->dp);
1900b7579f77SDag-Erling Smørgrav 
1901b7579f77SDag-Erling Smørgrav 	/* Select the next usable target, filtering out unsuitable targets. */
1902b7579f77SDag-Erling Smørgrav 	target = iter_server_selection(ie, qstate->env, iq->dp,
1903b7579f77SDag-Erling Smørgrav 		iq->dp->name, iq->dp->namelen, iq->qchase.qtype,
1904b7579f77SDag-Erling Smørgrav 		&iq->dnssec_lame_query, &iq->chase_to_rd,
1905b7579f77SDag-Erling Smørgrav 		iq->num_target_queries, qstate->blacklist);
1906b7579f77SDag-Erling Smørgrav 
1907b7579f77SDag-Erling Smørgrav 	/* If no usable target was selected... */
1908b7579f77SDag-Erling Smørgrav 	if(!target) {
1909b7579f77SDag-Erling Smørgrav 		/* Here we distinguish between three states: generate a new
1910b7579f77SDag-Erling Smørgrav 		 * target query, just wait, or quit (with a SERVFAIL).
1911b7579f77SDag-Erling Smørgrav 		 * We have the following information: number of active
1912b7579f77SDag-Erling Smørgrav 		 * target queries, number of active current queries,
1913b7579f77SDag-Erling Smørgrav 		 * the presence of missing targets at this delegation
1914b7579f77SDag-Erling Smørgrav 		 * point, and the given query target policy. */
1915b7579f77SDag-Erling Smørgrav 
1916b7579f77SDag-Erling Smørgrav 		/* Check for the wait condition. If this is true, then
1917b7579f77SDag-Erling Smørgrav 		 * an action must be taken. */
1918b7579f77SDag-Erling Smørgrav 		if(iq->num_target_queries==0 && iq->num_current_queries==0) {
1919b7579f77SDag-Erling Smørgrav 			/* If there is nothing to wait for, then we need
1920b7579f77SDag-Erling Smørgrav 			 * to distinguish between generating (a) new target
1921b7579f77SDag-Erling Smørgrav 			 * query, or failing. */
1922b7579f77SDag-Erling Smørgrav 			if(delegpt_count_missing_targets(iq->dp) > 0) {
1923b7579f77SDag-Erling Smørgrav 				int qs = 0;
1924b7579f77SDag-Erling Smørgrav 				verbose(VERB_ALGO, "querying for next "
1925b7579f77SDag-Erling Smørgrav 					"missing target");
1926b7579f77SDag-Erling Smørgrav 				if(!query_for_targets(qstate, iq, ie, id,
1927b7579f77SDag-Erling Smørgrav 					1, &qs)) {
1928b7579f77SDag-Erling Smørgrav 					return error_response(qstate, id,
1929b7579f77SDag-Erling Smørgrav 						LDNS_RCODE_SERVFAIL);
1930b7579f77SDag-Erling Smørgrav 				}
1931b7579f77SDag-Erling Smørgrav 				if(qs == 0 &&
1932b7579f77SDag-Erling Smørgrav 				   delegpt_count_missing_targets(iq->dp) == 0){
1933b7579f77SDag-Erling Smørgrav 					/* it looked like there were missing
1934b7579f77SDag-Erling Smørgrav 					 * targets, but they did not turn up.
1935b7579f77SDag-Erling Smørgrav 					 * Try the bad choices again (if any),
1936b7579f77SDag-Erling Smørgrav 					 * when we get back here missing==0,
1937b7579f77SDag-Erling Smørgrav 					 * so this is not a loop. */
1938b7579f77SDag-Erling Smørgrav 					return 1;
1939b7579f77SDag-Erling Smørgrav 				}
1940b7579f77SDag-Erling Smørgrav 				iq->num_target_queries += qs;
194152df462fSXin LI 				target_count_increase(iq, qs);
1942b7579f77SDag-Erling Smørgrav 			}
1943b7579f77SDag-Erling Smørgrav 			/* Since a target query might have been made, we
1944b7579f77SDag-Erling Smørgrav 			 * need to check again. */
1945b7579f77SDag-Erling Smørgrav 			if(iq->num_target_queries == 0) {
194609a3aaf3SDag-Erling Smørgrav 				/* if in capsforid fallback, instead of last
194709a3aaf3SDag-Erling Smørgrav 				 * resort, we agree with the current reply
194809a3aaf3SDag-Erling Smørgrav 				 * we have (if any) (our count of addrs bad)*/
194909a3aaf3SDag-Erling Smørgrav 				if(iq->caps_fallback && iq->caps_reply) {
195009a3aaf3SDag-Erling Smørgrav 					/* we're done, process the response */
195109a3aaf3SDag-Erling Smørgrav 					verbose(VERB_ALGO, "0x20 fallback had %d responses, "
195209a3aaf3SDag-Erling Smørgrav 						"but no more servers except "
195309a3aaf3SDag-Erling Smørgrav 						"last resort, done.",
195409a3aaf3SDag-Erling Smørgrav 						(int)iq->caps_server+1);
195509a3aaf3SDag-Erling Smørgrav 					iq->response = iq->caps_response;
195609a3aaf3SDag-Erling Smørgrav 					iq->caps_fallback = 0;
195709a3aaf3SDag-Erling Smørgrav 					iter_dec_attempts(iq->dp, 3); /* space for fallback */
195809a3aaf3SDag-Erling Smørgrav 					iq->num_current_queries++; /* RespState decrements it*/
195909a3aaf3SDag-Erling Smørgrav 					iq->referral_count++; /* make sure we don't loop */
196009a3aaf3SDag-Erling Smørgrav 					iq->sent_count = 0;
196109a3aaf3SDag-Erling Smørgrav 					iq->state = QUERY_RESP_STATE;
196209a3aaf3SDag-Erling Smørgrav 					return 1;
196309a3aaf3SDag-Erling Smørgrav 				}
1964b7579f77SDag-Erling Smørgrav 				return processLastResort(qstate, iq, ie, id);
1965b7579f77SDag-Erling Smørgrav 			}
1966b7579f77SDag-Erling Smørgrav 		}
1967b7579f77SDag-Erling Smørgrav 
1968b7579f77SDag-Erling Smørgrav 		/* otherwise, we have no current targets, so submerge
1969b7579f77SDag-Erling Smørgrav 		 * until one of the target or direct queries return. */
1970b7579f77SDag-Erling Smørgrav 		if(iq->num_target_queries>0 && iq->num_current_queries>0) {
1971b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "no current targets -- waiting "
1972b7579f77SDag-Erling Smørgrav 				"for %d targets to resolve or %d outstanding"
1973b7579f77SDag-Erling Smørgrav 				" queries to respond", iq->num_target_queries,
1974b7579f77SDag-Erling Smørgrav 				iq->num_current_queries);
1975b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_reply;
1976b7579f77SDag-Erling Smørgrav 		} else if(iq->num_target_queries>0) {
1977b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "no current targets -- waiting "
1978b7579f77SDag-Erling Smørgrav 				"for %d targets to resolve.",
1979b7579f77SDag-Erling Smørgrav 				iq->num_target_queries);
1980b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_subquery;
1981b7579f77SDag-Erling Smørgrav 		} else {
1982b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "no current targets -- waiting "
1983b7579f77SDag-Erling Smørgrav 				"for %d outstanding queries to respond.",
1984b7579f77SDag-Erling Smørgrav 				iq->num_current_queries);
1985b7579f77SDag-Erling Smørgrav 			qstate->ext_state[id] = module_wait_reply;
1986b7579f77SDag-Erling Smørgrav 		}
1987b7579f77SDag-Erling Smørgrav 		return 0;
1988b7579f77SDag-Erling Smørgrav 	}
1989b7579f77SDag-Erling Smørgrav 
199009a3aaf3SDag-Erling Smørgrav 	/* if not forwarding, check ratelimits per delegationpoint name */
199109a3aaf3SDag-Erling Smørgrav 	if(!(iq->chase_flags & BIT_RD) && !iq->ratelimit_ok) {
199209a3aaf3SDag-Erling Smørgrav 		if(!infra_ratelimit_inc(qstate->env->infra_cache, iq->dp->name,
199309a3aaf3SDag-Erling Smørgrav 			iq->dp->namelen, *qstate->env->now)) {
199409a3aaf3SDag-Erling Smørgrav 			verbose(VERB_ALGO, "query exceeded ratelimits");
199509a3aaf3SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
199609a3aaf3SDag-Erling Smørgrav 		}
199709a3aaf3SDag-Erling Smørgrav 	}
199809a3aaf3SDag-Erling Smørgrav 
199905ab2901SDag-Erling Smørgrav 	if(iq->minimisation_state == INIT_MINIMISE_STATE) {
2000*e2d15004SDag-Erling Smørgrav 		/* (Re)set qinfo_out to (new) delegation point, except when
2001*e2d15004SDag-Erling Smørgrav 		 * qinfo_out is already a subdomain of dp. This happens when
2002*e2d15004SDag-Erling Smørgrav 		 * increasing by more than one label at once (QNAMEs with more
2003*e2d15004SDag-Erling Smørgrav 		 * than MAX_MINIMISE_COUNT labels). */
200405ab2901SDag-Erling Smørgrav 		if(!(iq->qinfo_out.qname_len
200505ab2901SDag-Erling Smørgrav 			&& dname_subdomain_c(iq->qchase.qname,
200605ab2901SDag-Erling Smørgrav 				iq->qinfo_out.qname)
200705ab2901SDag-Erling Smørgrav 			&& dname_subdomain_c(iq->qinfo_out.qname,
200805ab2901SDag-Erling Smørgrav 				iq->dp->name))) {
200905ab2901SDag-Erling Smørgrav 			iq->qinfo_out.qname = iq->dp->name;
201005ab2901SDag-Erling Smørgrav 			iq->qinfo_out.qname_len = iq->dp->namelen;
201105ab2901SDag-Erling Smørgrav 			iq->qinfo_out.qtype = LDNS_RR_TYPE_NS;
201205ab2901SDag-Erling Smørgrav 			iq->qinfo_out.qclass = iq->qchase.qclass;
2013*e2d15004SDag-Erling Smørgrav 			iq->minimise_count = 0;
201405ab2901SDag-Erling Smørgrav 		}
201505ab2901SDag-Erling Smørgrav 
201605ab2901SDag-Erling Smørgrav 		iq->minimisation_state = MINIMISE_STATE;
201705ab2901SDag-Erling Smørgrav 	}
201805ab2901SDag-Erling Smørgrav 	if(iq->minimisation_state == MINIMISE_STATE) {
2019*e2d15004SDag-Erling Smørgrav 		int qchaselabs = dname_count_labels(iq->qchase.qname);
2020*e2d15004SDag-Erling Smørgrav 		int labdiff = qchaselabs -
202105ab2901SDag-Erling Smørgrav 			dname_count_labels(iq->qinfo_out.qname);
202205ab2901SDag-Erling Smørgrav 
202305ab2901SDag-Erling Smørgrav 		iq->qinfo_out.qname = iq->qchase.qname;
202405ab2901SDag-Erling Smørgrav 		iq->qinfo_out.qname_len = iq->qchase.qname_len;
2025*e2d15004SDag-Erling Smørgrav 		iq->minimise_count++;
202605ab2901SDag-Erling Smørgrav 
2027*e2d15004SDag-Erling Smørgrav 		/* Limit number of iterations for QNAMEs with more
2028*e2d15004SDag-Erling Smørgrav 		 * than MAX_MINIMISE_COUNT labels. Send first MINIMISE_ONE_LAB
2029*e2d15004SDag-Erling Smørgrav 		 * labels of QNAME always individually.
2030*e2d15004SDag-Erling Smørgrav 		 */
2031*e2d15004SDag-Erling Smørgrav 		if(qchaselabs > MAX_MINIMISE_COUNT && labdiff > 1 &&
2032*e2d15004SDag-Erling Smørgrav 			iq->minimise_count > MINIMISE_ONE_LAB) {
2033*e2d15004SDag-Erling Smørgrav 			if(iq->minimise_count < MAX_MINIMISE_COUNT) {
2034*e2d15004SDag-Erling Smørgrav 				int multilabs = qchaselabs - 1 -
2035*e2d15004SDag-Erling Smørgrav 					MINIMISE_ONE_LAB;
2036*e2d15004SDag-Erling Smørgrav 				int extralabs = multilabs /
2037*e2d15004SDag-Erling Smørgrav 					MINIMISE_MULTIPLE_LABS;
2038*e2d15004SDag-Erling Smørgrav 
2039*e2d15004SDag-Erling Smørgrav 				if (MAX_MINIMISE_COUNT - iq->minimise_count >=
2040*e2d15004SDag-Erling Smørgrav 					multilabs % MINIMISE_MULTIPLE_LABS)
2041*e2d15004SDag-Erling Smørgrav 					/* Default behaviour is to add 1 label
2042*e2d15004SDag-Erling Smørgrav 					 * every iteration. Therefore, decrement
2043*e2d15004SDag-Erling Smørgrav 					 * the extralabs by 1 */
2044*e2d15004SDag-Erling Smørgrav 					extralabs--;
2045*e2d15004SDag-Erling Smørgrav 				if (extralabs < labdiff)
2046*e2d15004SDag-Erling Smørgrav 					labdiff -= extralabs;
2047*e2d15004SDag-Erling Smørgrav 				else
2048*e2d15004SDag-Erling Smørgrav 					labdiff = 1;
2049*e2d15004SDag-Erling Smørgrav 			}
2050*e2d15004SDag-Erling Smørgrav 			/* Last minimised iteration, send all labels with
2051*e2d15004SDag-Erling Smørgrav 			 * QTYPE=NS */
2052*e2d15004SDag-Erling Smørgrav 			else
2053*e2d15004SDag-Erling Smørgrav 				labdiff = 1;
205405ab2901SDag-Erling Smørgrav 		}
205505ab2901SDag-Erling Smørgrav 
205605ab2901SDag-Erling Smørgrav 		if(labdiff > 1) {
205705ab2901SDag-Erling Smørgrav 			verbose(VERB_QUERY, "removing %d labels", labdiff-1);
205805ab2901SDag-Erling Smørgrav 			dname_remove_labels(&iq->qinfo_out.qname,
205905ab2901SDag-Erling Smørgrav 				&iq->qinfo_out.qname_len,
206005ab2901SDag-Erling Smørgrav 				labdiff-1);
206105ab2901SDag-Erling Smørgrav 		}
206205ab2901SDag-Erling Smørgrav 		if(labdiff < 1 ||
206305ab2901SDag-Erling Smørgrav 			(labdiff < 2 && iq->qchase.qtype == LDNS_RR_TYPE_DS))
206405ab2901SDag-Erling Smørgrav 			/* Stop minimising this query, resolve "as usual" */
206505ab2901SDag-Erling Smørgrav 			iq->minimisation_state = DONOT_MINIMISE_STATE;
206605ab2901SDag-Erling Smørgrav 		else {
206705ab2901SDag-Erling Smørgrav 			struct dns_msg* msg = dns_cache_lookup(qstate->env,
206805ab2901SDag-Erling Smørgrav 				iq->qinfo_out.qname, iq->qinfo_out.qname_len,
206905ab2901SDag-Erling Smørgrav 				iq->qinfo_out.qtype, iq->qinfo_out.qclass,
207005ab2901SDag-Erling Smørgrav 				qstate->query_flags, qstate->region,
207105ab2901SDag-Erling Smørgrav 				qstate->env->scratch);
207205ab2901SDag-Erling Smørgrav 			if(msg && msg->rep->an_numrrsets == 0
207305ab2901SDag-Erling Smørgrav 				&& FLAGS_GET_RCODE(msg->rep->flags) ==
207405ab2901SDag-Erling Smørgrav 				LDNS_RCODE_NOERROR)
207505ab2901SDag-Erling Smørgrav 				/* no need to send query if it is already
207605ab2901SDag-Erling Smørgrav 				 * cached as NOERROR/NODATA */
207705ab2901SDag-Erling Smørgrav 				return 1;
207805ab2901SDag-Erling Smørgrav 		}
207905ab2901SDag-Erling Smørgrav 	}
208005ab2901SDag-Erling Smørgrav 	if(iq->minimisation_state == SKIP_MINIMISE_STATE)
208105ab2901SDag-Erling Smørgrav 		/* Do not increment qname, continue incrementing next
208205ab2901SDag-Erling Smørgrav 		 * iteration */
208305ab2901SDag-Erling Smørgrav 		iq->minimisation_state = MINIMISE_STATE;
208405ab2901SDag-Erling Smørgrav 	if(iq->minimisation_state == DONOT_MINIMISE_STATE)
208505ab2901SDag-Erling Smørgrav 		iq->qinfo_out = iq->qchase;
208605ab2901SDag-Erling Smørgrav 
2087b7579f77SDag-Erling Smørgrav 	/* We have a valid target. */
2088b7579f77SDag-Erling Smørgrav 	if(verbosity >= VERB_QUERY) {
208905ab2901SDag-Erling Smørgrav 		log_query_info(VERB_QUERY, "sending query:", &iq->qinfo_out);
2090b7579f77SDag-Erling Smørgrav 		log_name_addr(VERB_QUERY, "sending to target:", iq->dp->name,
2091b7579f77SDag-Erling Smørgrav 			&target->addr, target->addrlen);
2092b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "dnssec status: %s%s",
2093b7579f77SDag-Erling Smørgrav 			iq->dnssec_expected?"expected": "not expected",
2094b7579f77SDag-Erling Smørgrav 			iq->dnssec_lame_query?" but lame_query anyway": "");
2095b7579f77SDag-Erling Smørgrav 	}
2096b7579f77SDag-Erling Smørgrav 	fptr_ok(fptr_whitelist_modenv_send_query(qstate->env->send_query));
2097b7579f77SDag-Erling Smørgrav 	outq = (*qstate->env->send_query)(
209805ab2901SDag-Erling Smørgrav 		iq->qinfo_out.qname, iq->qinfo_out.qname_len,
209905ab2901SDag-Erling Smørgrav 		iq->qinfo_out.qtype, iq->qinfo_out.qclass,
2100*e2d15004SDag-Erling Smørgrav 		iq->chase_flags | (iq->chase_to_rd?BIT_RD:0),
2101*e2d15004SDag-Erling Smørgrav 		/* unset CD if to forwarder(RD set) and not dnssec retry
2102*e2d15004SDag-Erling Smørgrav 		 * (blacklist nonempty) and no trust-anchors are configured
2103*e2d15004SDag-Erling Smørgrav 		 * above the qname or on the first attempt when dnssec is on */
2104*e2d15004SDag-Erling Smørgrav 		EDNS_DO| ((iq->chase_to_rd||(iq->chase_flags&BIT_RD)!=0)&&
2105*e2d15004SDag-Erling Smørgrav 		!qstate->blacklist&&(!iter_indicates_dnssec_fwd(qstate->env,
2106*e2d15004SDag-Erling Smørgrav 		&iq->qinfo_out)||target->attempts==1)?0:BIT_CD),
210709a3aaf3SDag-Erling Smørgrav 		iq->dnssec_expected, iq->caps_fallback || is_caps_whitelisted(
2108*e2d15004SDag-Erling Smørgrav 		ie, iq), opt_list, &target->addr, target->addrlen,
2109*e2d15004SDag-Erling Smørgrav 		iq->dp->name, iq->dp->namelen, qstate);
2110b7579f77SDag-Erling Smørgrav 	if(!outq) {
2111b7579f77SDag-Erling Smørgrav 		log_addr(VERB_DETAIL, "error sending query to auth server",
2112b7579f77SDag-Erling Smørgrav 			&target->addr, target->addrlen);
211309a3aaf3SDag-Erling Smørgrav 		if(!(iq->chase_flags & BIT_RD) && !iq->ratelimit_ok)
211409a3aaf3SDag-Erling Smørgrav 		    infra_ratelimit_dec(qstate->env->infra_cache, iq->dp->name,
211509a3aaf3SDag-Erling Smørgrav 			iq->dp->namelen, *qstate->env->now);
2116b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2117b7579f77SDag-Erling Smørgrav 	}
2118b7579f77SDag-Erling Smørgrav 	outbound_list_insert(&iq->outlist, outq);
2119b7579f77SDag-Erling Smørgrav 	iq->num_current_queries++;
2120b7579f77SDag-Erling Smørgrav 	iq->sent_count++;
2121b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_wait_reply;
2122b7579f77SDag-Erling Smørgrav 
2123b7579f77SDag-Erling Smørgrav 	return 0;
2124b7579f77SDag-Erling Smørgrav }
2125b7579f77SDag-Erling Smørgrav 
2126b7579f77SDag-Erling Smørgrav /** find NS rrset in given list */
2127b7579f77SDag-Erling Smørgrav static struct ub_packed_rrset_key*
2128b7579f77SDag-Erling Smørgrav find_NS(struct reply_info* rep, size_t from, size_t to)
2129b7579f77SDag-Erling Smørgrav {
2130b7579f77SDag-Erling Smørgrav 	size_t i;
2131b7579f77SDag-Erling Smørgrav 	for(i=from; i<to; i++) {
2132b7579f77SDag-Erling Smørgrav 		if(ntohs(rep->rrsets[i]->rk.type) == LDNS_RR_TYPE_NS)
2133b7579f77SDag-Erling Smørgrav 			return rep->rrsets[i];
2134b7579f77SDag-Erling Smørgrav 	}
2135b7579f77SDag-Erling Smørgrav 	return NULL;
2136b7579f77SDag-Erling Smørgrav }
2137b7579f77SDag-Erling Smørgrav 
2138b7579f77SDag-Erling Smørgrav 
2139b7579f77SDag-Erling Smørgrav /**
2140b7579f77SDag-Erling Smørgrav  * Process the query response. All queries end up at this state first. This
2141b7579f77SDag-Erling Smørgrav  * process generally consists of analyzing the response and routing the
2142b7579f77SDag-Erling Smørgrav  * event to the next state (either bouncing it back to a request state, or
2143b7579f77SDag-Erling Smørgrav  * terminating the processing for this event).
2144b7579f77SDag-Erling Smørgrav  *
2145b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2146b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
2147b7579f77SDag-Erling Smørgrav  * @param id: module id.
2148b7579f77SDag-Erling Smørgrav  * @return true if the event requires more immediate processing, false if
2149b7579f77SDag-Erling Smørgrav  *         not. This is generally only true when forwarding the request to
2150b7579f77SDag-Erling Smørgrav  *         the final state (i.e., on answer).
2151b7579f77SDag-Erling Smørgrav  */
2152b7579f77SDag-Erling Smørgrav static int
2153b7579f77SDag-Erling Smørgrav processQueryResponse(struct module_qstate* qstate, struct iter_qstate* iq,
2154b7579f77SDag-Erling Smørgrav 	int id)
2155b7579f77SDag-Erling Smørgrav {
2156b7579f77SDag-Erling Smørgrav 	int dnsseclame = 0;
2157b7579f77SDag-Erling Smørgrav 	enum response_type type;
2158b7579f77SDag-Erling Smørgrav 	iq->num_current_queries--;
2159b7579f77SDag-Erling Smørgrav 	if(iq->response == NULL) {
216005ab2901SDag-Erling Smørgrav 		/* Don't increment qname when QNAME minimisation is enabled */
216105ab2901SDag-Erling Smørgrav 		if (qstate->env->cfg->qname_minimisation)
216205ab2901SDag-Erling Smørgrav 			iq->minimisation_state = SKIP_MINIMISE_STATE;
2163b7579f77SDag-Erling Smørgrav 		iq->chase_to_rd = 0;
2164b7579f77SDag-Erling Smørgrav 		iq->dnssec_lame_query = 0;
2165b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "query response was timeout");
2166b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2167b7579f77SDag-Erling Smørgrav 	}
2168b7579f77SDag-Erling Smørgrav 	type = response_type_from_server(
2169b7579f77SDag-Erling Smørgrav 		(int)((iq->chase_flags&BIT_RD) || iq->chase_to_rd),
2170b7579f77SDag-Erling Smørgrav 		iq->response, &iq->qchase, iq->dp);
2171b7579f77SDag-Erling Smørgrav 	iq->chase_to_rd = 0;
2172b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_REFERRAL && (iq->chase_flags&BIT_RD)) {
2173b7579f77SDag-Erling Smørgrav 		/* When forwarding (RD bit is set), we handle referrals
2174b7579f77SDag-Erling Smørgrav 		 * differently. No queries should be sent elsewhere */
2175b7579f77SDag-Erling Smørgrav 		type = RESPONSE_TYPE_ANSWER;
2176b7579f77SDag-Erling Smørgrav 	}
2177*e2d15004SDag-Erling Smørgrav 	if(!qstate->env->cfg->disable_dnssec_lame_check && iq->dnssec_expected
2178*e2d15004SDag-Erling Smørgrav                 && !iq->dnssec_lame_query &&
2179b7579f77SDag-Erling Smørgrav 		!(iq->chase_flags&BIT_RD)
2180*e2d15004SDag-Erling Smørgrav 		&& iq->sent_count < DNSSEC_LAME_DETECT_COUNT
2181b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_LAME
2182b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_REC_LAME
2183b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_THROWAWAY
2184b7579f77SDag-Erling Smørgrav 		&& type != RESPONSE_TYPE_UNTYPED) {
2185b7579f77SDag-Erling Smørgrav 		/* a possible answer, see if it is missing DNSSEC */
2186b7579f77SDag-Erling Smørgrav 		/* but not when forwarding, so we dont mark fwder lame */
218717d15b25SDag-Erling Smørgrav 		if(!iter_msg_has_dnssec(iq->response)) {
218817d15b25SDag-Erling Smørgrav 			/* Mark this address as dnsseclame in this dp,
218917d15b25SDag-Erling Smørgrav 			 * because that will make serverselection disprefer
219017d15b25SDag-Erling Smørgrav 			 * it, but also, once it is the only final option,
219117d15b25SDag-Erling Smørgrav 			 * use dnssec-lame-bypass if it needs to query there.*/
219217d15b25SDag-Erling Smørgrav 			if(qstate->reply) {
219317d15b25SDag-Erling Smørgrav 				struct delegpt_addr* a = delegpt_find_addr(
219417d15b25SDag-Erling Smørgrav 					iq->dp, &qstate->reply->addr,
219517d15b25SDag-Erling Smørgrav 					qstate->reply->addrlen);
219617d15b25SDag-Erling Smørgrav 				if(a) a->dnsseclame = 1;
219717d15b25SDag-Erling Smørgrav 			}
219817d15b25SDag-Erling Smørgrav 			/* test the answer is from the zone we expected,
2199b7579f77SDag-Erling Smørgrav 		 	 * otherwise, (due to parent,child on same server), we
2200b7579f77SDag-Erling Smørgrav 		 	 * might mark the server,zone lame inappropriately */
220117d15b25SDag-Erling Smørgrav 			if(!iter_msg_from_zone(iq->response, iq->dp, type,
220217d15b25SDag-Erling Smørgrav 				iq->qchase.qclass))
220317d15b25SDag-Erling Smørgrav 				qstate->reply = NULL;
2204b7579f77SDag-Erling Smørgrav 			type = RESPONSE_TYPE_LAME;
2205b7579f77SDag-Erling Smørgrav 			dnsseclame = 1;
2206b7579f77SDag-Erling Smørgrav 		}
2207b7579f77SDag-Erling Smørgrav 	} else iq->dnssec_lame_query = 0;
2208b7579f77SDag-Erling Smørgrav 	/* see if referral brings us close to the target */
2209b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_REFERRAL) {
2210b7579f77SDag-Erling Smørgrav 		struct ub_packed_rrset_key* ns = find_NS(
2211b7579f77SDag-Erling Smørgrav 			iq->response->rep, iq->response->rep->an_numrrsets,
2212b7579f77SDag-Erling Smørgrav 			iq->response->rep->an_numrrsets
2213b7579f77SDag-Erling Smørgrav 			+ iq->response->rep->ns_numrrsets);
2214b7579f77SDag-Erling Smørgrav 		if(!ns) ns = find_NS(iq->response->rep, 0,
2215b7579f77SDag-Erling Smørgrav 				iq->response->rep->an_numrrsets);
2216b7579f77SDag-Erling Smørgrav 		if(!ns || !dname_strict_subdomain_c(ns->rk.dname, iq->dp->name)
2217b7579f77SDag-Erling Smørgrav 			|| !dname_subdomain_c(iq->qchase.qname, ns->rk.dname)){
2218b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "bad referral, throwaway");
2219b7579f77SDag-Erling Smørgrav 			type = RESPONSE_TYPE_THROWAWAY;
2220b7579f77SDag-Erling Smørgrav 		} else
2221b7579f77SDag-Erling Smørgrav 			iter_scrub_ds(iq->response, ns, iq->dp->name);
2222b7579f77SDag-Erling Smørgrav 	} else iter_scrub_ds(iq->response, NULL, NULL);
2223b7579f77SDag-Erling Smørgrav 
2224b7579f77SDag-Erling Smørgrav 	/* handle each of the type cases */
2225b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_ANSWER) {
2226b7579f77SDag-Erling Smørgrav 		/* ANSWER type responses terminate the query algorithm,
2227b7579f77SDag-Erling Smørgrav 		 * so they sent on their */
2228b7579f77SDag-Erling Smørgrav 		if(verbosity >= VERB_DETAIL) {
2229b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "query response was %s",
2230b7579f77SDag-Erling Smørgrav 				FLAGS_GET_RCODE(iq->response->rep->flags)
2231b7579f77SDag-Erling Smørgrav 				==LDNS_RCODE_NXDOMAIN?"NXDOMAIN ANSWER":
2232b7579f77SDag-Erling Smørgrav 				(iq->response->rep->an_numrrsets?"ANSWER":
2233b7579f77SDag-Erling Smørgrav 				"nodata ANSWER"));
2234b7579f77SDag-Erling Smørgrav 		}
2235b7579f77SDag-Erling Smørgrav 		/* if qtype is DS, check we have the right level of answer,
2236b7579f77SDag-Erling Smørgrav 		 * like grandchild answer but we need the middle, reject it */
2237b7579f77SDag-Erling Smørgrav 		if(iq->qchase.qtype == LDNS_RR_TYPE_DS && !iq->dsns_point
2238b7579f77SDag-Erling Smørgrav 			&& !(iq->chase_flags&BIT_RD)
2239b7579f77SDag-Erling Smørgrav 			&& iter_ds_toolow(iq->response, iq->dp)
22408ed2b524SDag-Erling Smørgrav 			&& iter_dp_cangodown(&iq->qchase, iq->dp)) {
22418ed2b524SDag-Erling Smørgrav 			/* close down outstanding requests to be discarded */
22428ed2b524SDag-Erling Smørgrav 			outbound_list_clear(&iq->outlist);
22438ed2b524SDag-Erling Smørgrav 			iq->num_current_queries = 0;
22448ed2b524SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_detach_subs(
22458ed2b524SDag-Erling Smørgrav 				qstate->env->detach_subs));
22468ed2b524SDag-Erling Smørgrav 			(*qstate->env->detach_subs)(qstate);
22478ed2b524SDag-Erling Smørgrav 			iq->num_target_queries = 0;
2248b7579f77SDag-Erling Smørgrav 			return processDSNSFind(qstate, iq, id);
22498ed2b524SDag-Erling Smørgrav 		}
22508ed2b524SDag-Erling Smørgrav 		iter_dns_store(qstate->env, &iq->response->qinfo,
2251b7579f77SDag-Erling Smørgrav 			iq->response->rep, 0, qstate->prefetch_leeway,
2252b7579f77SDag-Erling Smørgrav 			iq->dp&&iq->dp->has_parent_side_NS,
2253ff825849SDag-Erling Smørgrav 			qstate->region, qstate->query_flags);
2254b7579f77SDag-Erling Smørgrav 		/* close down outstanding requests to be discarded */
2255b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
2256b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
2257b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
2258b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
2259b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
2260b7579f77SDag-Erling Smørgrav 		iq->num_target_queries = 0;
2261b7579f77SDag-Erling Smørgrav 		if(qstate->reply)
2262b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin,
2263b7579f77SDag-Erling Smørgrav 				&qstate->reply->addr, qstate->reply->addrlen,
2264b7579f77SDag-Erling Smørgrav 				qstate->region);
226505ab2901SDag-Erling Smørgrav 		if(iq->minimisation_state != DONOT_MINIMISE_STATE) {
226605ab2901SDag-Erling Smørgrav 			/* Best effort qname-minimisation.
226705ab2901SDag-Erling Smørgrav 			 * Stop minimising and send full query when RCODE
2268*e2d15004SDag-Erling Smørgrav 			 * is not NOERROR. */
226905ab2901SDag-Erling Smørgrav 			if(FLAGS_GET_RCODE(iq->response->rep->flags) !=
227005ab2901SDag-Erling Smørgrav 				LDNS_RCODE_NOERROR)
227105ab2901SDag-Erling Smørgrav 				iq->minimisation_state = DONOT_MINIMISE_STATE;
2272*e2d15004SDag-Erling Smørgrav 			if(FLAGS_GET_RCODE(iq->response->rep->flags) ==
2273*e2d15004SDag-Erling Smørgrav 				LDNS_RCODE_NXDOMAIN) {
2274*e2d15004SDag-Erling Smørgrav 				/* Stop resolving when NXDOMAIN is DNSSEC
2275*e2d15004SDag-Erling Smørgrav 				 * signed. Based on assumption that namservers
2276*e2d15004SDag-Erling Smørgrav 				 * serving signed zones do not return NXDOMAIN
2277*e2d15004SDag-Erling Smørgrav 				 * for empty-non-terminals. */
2278*e2d15004SDag-Erling Smørgrav 				if(iq->dnssec_expected)
2279*e2d15004SDag-Erling Smørgrav 					return final_state(iq);
2280*e2d15004SDag-Erling Smørgrav 				/* Make subrequest to validate intermediate
2281*e2d15004SDag-Erling Smørgrav 				 * NXDOMAIN if harden-below-nxdomain is
2282*e2d15004SDag-Erling Smørgrav 				 * enabled. */
2283*e2d15004SDag-Erling Smørgrav 				if(qstate->env->cfg->harden_below_nxdomain) {
2284*e2d15004SDag-Erling Smørgrav 					struct module_qstate* subq = NULL;
2285*e2d15004SDag-Erling Smørgrav 					log_query_info(VERB_QUERY,
2286*e2d15004SDag-Erling Smørgrav 						"schedule NXDOMAIN validation:",
2287*e2d15004SDag-Erling Smørgrav 						&iq->response->qinfo);
2288*e2d15004SDag-Erling Smørgrav 					if(!generate_sub_request(
2289*e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qname,
2290*e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qname_len,
2291*e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qtype,
2292*e2d15004SDag-Erling Smørgrav 						iq->response->qinfo.qclass,
2293*e2d15004SDag-Erling Smørgrav 						qstate, id, iq,
2294*e2d15004SDag-Erling Smørgrav 						INIT_REQUEST_STATE,
2295*e2d15004SDag-Erling Smørgrav 						FINISHED_STATE, &subq, 1))
2296*e2d15004SDag-Erling Smørgrav 						verbose(VERB_ALGO,
2297*e2d15004SDag-Erling Smørgrav 						"could not validate NXDOMAIN "
2298*e2d15004SDag-Erling Smørgrav 						"response");
2299*e2d15004SDag-Erling Smørgrav 				}
2300*e2d15004SDag-Erling Smørgrav 			}
230105ab2901SDag-Erling Smørgrav 			return next_state(iq, QUERYTARGETS_STATE);
230205ab2901SDag-Erling Smørgrav 		}
2303b7579f77SDag-Erling Smørgrav 		return final_state(iq);
2304b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_REFERRAL) {
2305b7579f77SDag-Erling Smørgrav 		/* REFERRAL type responses get a reset of the
2306b7579f77SDag-Erling Smørgrav 		 * delegation point, and back to the QUERYTARGETS_STATE. */
2307b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was REFERRAL");
2308b7579f77SDag-Erling Smørgrav 
230909a3aaf3SDag-Erling Smørgrav 		if(!(iq->chase_flags & BIT_RD) && !iq->ratelimit_ok) {
231009a3aaf3SDag-Erling Smørgrav 			/* we have a referral, no ratelimit, we can send
231109a3aaf3SDag-Erling Smørgrav 			 * our queries to the given name */
231209a3aaf3SDag-Erling Smørgrav 			infra_ratelimit_dec(qstate->env->infra_cache,
231309a3aaf3SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
231409a3aaf3SDag-Erling Smørgrav 				*qstate->env->now);
231509a3aaf3SDag-Erling Smørgrav 		}
231609a3aaf3SDag-Erling Smørgrav 
2317b7579f77SDag-Erling Smørgrav 		/* if hardened, only store referral if we asked for it */
2318b7579f77SDag-Erling Smørgrav 		if(!qstate->env->cfg->harden_referral_path ||
2319b7579f77SDag-Erling Smørgrav 		    (  qstate->qinfo.qtype == LDNS_RR_TYPE_NS
2320b7579f77SDag-Erling Smørgrav 			&& (qstate->query_flags&BIT_RD)
2321b7579f77SDag-Erling Smørgrav 			&& !(qstate->query_flags&BIT_CD)
2322b7579f77SDag-Erling Smørgrav 			   /* we know that all other NS rrsets are scrubbed
2323b7579f77SDag-Erling Smørgrav 			    * away, thus on referral only one is left.
2324b7579f77SDag-Erling Smørgrav 			    * see if that equals the query name... */
2325b7579f77SDag-Erling Smørgrav 			&& ( /* auth section, but sometimes in answer section*/
2326b7579f77SDag-Erling Smørgrav 			  reply_find_rrset_section_ns(iq->response->rep,
2327b7579f77SDag-Erling Smørgrav 				iq->qchase.qname, iq->qchase.qname_len,
2328b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_NS, iq->qchase.qclass)
2329b7579f77SDag-Erling Smørgrav 			  || reply_find_rrset_section_an(iq->response->rep,
2330b7579f77SDag-Erling Smørgrav 				iq->qchase.qname, iq->qchase.qname_len,
2331b7579f77SDag-Erling Smørgrav 				LDNS_RR_TYPE_NS, iq->qchase.qclass)
2332b7579f77SDag-Erling Smørgrav 			  )
2333b7579f77SDag-Erling Smørgrav 		    )) {
2334b7579f77SDag-Erling Smørgrav 			/* Store the referral under the current query */
2335b7579f77SDag-Erling Smørgrav 			/* no prefetch-leeway, since its not the answer */
23368ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &iq->response->qinfo,
2337ff825849SDag-Erling Smørgrav 				iq->response->rep, 1, 0, 0, NULL, 0);
2338b7579f77SDag-Erling Smørgrav 			if(iq->store_parent_NS)
2339b7579f77SDag-Erling Smørgrav 				iter_store_parentside_NS(qstate->env,
2340b7579f77SDag-Erling Smørgrav 					iq->response->rep);
2341b7579f77SDag-Erling Smørgrav 			if(qstate->env->neg_cache)
2342b7579f77SDag-Erling Smørgrav 				val_neg_addreferral(qstate->env->neg_cache,
2343b7579f77SDag-Erling Smørgrav 					iq->response->rep, iq->dp->name);
2344b7579f77SDag-Erling Smørgrav 		}
2345b7579f77SDag-Erling Smørgrav 		/* store parent-side-in-zone-glue, if directly queried for */
2346b7579f77SDag-Erling Smørgrav 		if(iq->query_for_pside_glue && !iq->pside_glue) {
2347b7579f77SDag-Erling Smørgrav 			iq->pside_glue = reply_find_rrset(iq->response->rep,
2348b7579f77SDag-Erling Smørgrav 				iq->qchase.qname, iq->qchase.qname_len,
2349b7579f77SDag-Erling Smørgrav 				iq->qchase.qtype, iq->qchase.qclass);
2350b7579f77SDag-Erling Smørgrav 			if(iq->pside_glue) {
2351b7579f77SDag-Erling Smørgrav 				log_rrset_key(VERB_ALGO, "found parent-side "
2352b7579f77SDag-Erling Smørgrav 					"glue", iq->pside_glue);
2353b7579f77SDag-Erling Smørgrav 				iter_store_parentside_rrset(qstate->env,
2354b7579f77SDag-Erling Smørgrav 					iq->pside_glue);
2355b7579f77SDag-Erling Smørgrav 			}
2356b7579f77SDag-Erling Smørgrav 		}
2357b7579f77SDag-Erling Smørgrav 
2358b7579f77SDag-Erling Smørgrav 		/* Reset the event state, setting the current delegation
2359b7579f77SDag-Erling Smørgrav 		 * point to the referral. */
2360b7579f77SDag-Erling Smørgrav 		iq->deleg_msg = iq->response;
2361b7579f77SDag-Erling Smørgrav 		iq->dp = delegpt_from_message(iq->response, qstate->region);
236205ab2901SDag-Erling Smørgrav 		if (qstate->env->cfg->qname_minimisation)
236305ab2901SDag-Erling Smørgrav 			iq->minimisation_state = INIT_MINIMISE_STATE;
2364b7579f77SDag-Erling Smørgrav 		if(!iq->dp)
2365b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2366b7579f77SDag-Erling Smørgrav 		if(!cache_fill_missing(qstate->env, iq->qchase.qclass,
2367b7579f77SDag-Erling Smørgrav 			qstate->region, iq->dp))
2368b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2369b7579f77SDag-Erling Smørgrav 		if(iq->store_parent_NS && query_dname_compare(iq->dp->name,
2370b7579f77SDag-Erling Smørgrav 			iq->store_parent_NS->name) == 0)
2371b7579f77SDag-Erling Smørgrav 			iter_merge_retry_counts(iq->dp, iq->store_parent_NS);
2372b7579f77SDag-Erling Smørgrav 		delegpt_log(VERB_ALGO, iq->dp);
2373b7579f77SDag-Erling Smørgrav 		/* Count this as a referral. */
2374b7579f77SDag-Erling Smørgrav 		iq->referral_count++;
2375b7579f77SDag-Erling Smørgrav 		iq->sent_count = 0;
2376b7579f77SDag-Erling Smørgrav 		/* see if the next dp is a trust anchor, or a DS was sent
2377b7579f77SDag-Erling Smørgrav 		 * along, indicating dnssec is expected for next zone */
2378b7579f77SDag-Erling Smørgrav 		iq->dnssec_expected = iter_indicates_dnssec(qstate->env,
2379b7579f77SDag-Erling Smørgrav 			iq->dp, iq->response, iq->qchase.qclass);
2380b7579f77SDag-Erling Smørgrav 		/* if dnssec, validating then also fetch the key for the DS */
2381b7579f77SDag-Erling Smørgrav 		if(iq->dnssec_expected && qstate->env->cfg->prefetch_key &&
2382b7579f77SDag-Erling Smørgrav 			!(qstate->query_flags&BIT_CD))
2383b7579f77SDag-Erling Smørgrav 			generate_dnskey_prefetch(qstate, iq, id);
2384b7579f77SDag-Erling Smørgrav 
2385b7579f77SDag-Erling Smørgrav 		/* spawn off NS and addr to auth servers for the NS we just
2386b7579f77SDag-Erling Smørgrav 		 * got in the referral. This gets authoritative answer
2387b7579f77SDag-Erling Smørgrav 		 * (answer section trust level) rrset.
2388b7579f77SDag-Erling Smørgrav 		 * right after, we detach the subs, answer goes to cache. */
2389b7579f77SDag-Erling Smørgrav 		if(qstate->env->cfg->harden_referral_path)
2390b7579f77SDag-Erling Smørgrav 			generate_ns_check(qstate, iq, id);
2391b7579f77SDag-Erling Smørgrav 
2392b7579f77SDag-Erling Smørgrav 		/* stop current outstanding queries.
2393b7579f77SDag-Erling Smørgrav 		 * FIXME: should the outstanding queries be waited for and
2394b7579f77SDag-Erling Smørgrav 		 * handled? Say by a subquery that inherits the outbound_entry.
2395b7579f77SDag-Erling Smørgrav 		 */
2396b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
2397b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
2398b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
2399b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
2400b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
2401b7579f77SDag-Erling Smørgrav 		iq->num_target_queries = 0;
2402b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "cleared outbound list for next round");
2403b7579f77SDag-Erling Smørgrav 		return next_state(iq, QUERYTARGETS_STATE);
2404b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_CNAME) {
2405b7579f77SDag-Erling Smørgrav 		uint8_t* sname = NULL;
2406b7579f77SDag-Erling Smørgrav 		size_t snamelen = 0;
2407b7579f77SDag-Erling Smørgrav 		/* CNAME type responses get a query restart (i.e., get a
2408b7579f77SDag-Erling Smørgrav 		 * reset of the query state and go back to INIT_REQUEST_STATE).
2409b7579f77SDag-Erling Smørgrav 		 */
2410b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was CNAME");
2411b7579f77SDag-Erling Smørgrav 		if(verbosity >= VERB_ALGO)
2412b7579f77SDag-Erling Smørgrav 			log_dns_msg("cname msg", &iq->response->qinfo,
2413b7579f77SDag-Erling Smørgrav 				iq->response->rep);
2414b7579f77SDag-Erling Smørgrav 		/* if qtype is DS, check we have the right level of answer,
2415b7579f77SDag-Erling Smørgrav 		 * like grandchild answer but we need the middle, reject it */
2416b7579f77SDag-Erling Smørgrav 		if(iq->qchase.qtype == LDNS_RR_TYPE_DS && !iq->dsns_point
2417b7579f77SDag-Erling Smørgrav 			&& !(iq->chase_flags&BIT_RD)
2418b7579f77SDag-Erling Smørgrav 			&& iter_ds_toolow(iq->response, iq->dp)
24198ed2b524SDag-Erling Smørgrav 			&& iter_dp_cangodown(&iq->qchase, iq->dp)) {
24208ed2b524SDag-Erling Smørgrav 			outbound_list_clear(&iq->outlist);
24218ed2b524SDag-Erling Smørgrav 			iq->num_current_queries = 0;
24228ed2b524SDag-Erling Smørgrav 			fptr_ok(fptr_whitelist_modenv_detach_subs(
24238ed2b524SDag-Erling Smørgrav 				qstate->env->detach_subs));
24248ed2b524SDag-Erling Smørgrav 			(*qstate->env->detach_subs)(qstate);
24258ed2b524SDag-Erling Smørgrav 			iq->num_target_queries = 0;
2426b7579f77SDag-Erling Smørgrav 			return processDSNSFind(qstate, iq, id);
24278ed2b524SDag-Erling Smørgrav 		}
2428b7579f77SDag-Erling Smørgrav 		/* Process the CNAME response. */
2429b7579f77SDag-Erling Smørgrav 		if(!handle_cname_response(qstate, iq, iq->response,
2430b7579f77SDag-Erling Smørgrav 			&sname, &snamelen))
2431b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2432b7579f77SDag-Erling Smørgrav 		/* cache the CNAME response under the current query */
2433b7579f77SDag-Erling Smørgrav 		/* NOTE : set referral=1, so that rrsets get stored but not
2434b7579f77SDag-Erling Smørgrav 		 * the partial query answer (CNAME only). */
2435b7579f77SDag-Erling Smørgrav 		/* prefetchleeway applied because this updates answer parts */
24368ed2b524SDag-Erling Smørgrav 		iter_dns_store(qstate->env, &iq->response->qinfo,
2437b7579f77SDag-Erling Smørgrav 			iq->response->rep, 1, qstate->prefetch_leeway,
2438ff825849SDag-Erling Smørgrav 			iq->dp&&iq->dp->has_parent_side_NS, NULL,
2439ff825849SDag-Erling Smørgrav 			qstate->query_flags);
2440b7579f77SDag-Erling Smørgrav 		/* set the current request's qname to the new value. */
2441b7579f77SDag-Erling Smørgrav 		iq->qchase.qname = sname;
2442b7579f77SDag-Erling Smørgrav 		iq->qchase.qname_len = snamelen;
244305ab2901SDag-Erling Smørgrav 		if (qstate->env->cfg->qname_minimisation)
244405ab2901SDag-Erling Smørgrav 			iq->minimisation_state = INIT_MINIMISE_STATE;
2445b7579f77SDag-Erling Smørgrav 		/* Clear the query state, since this is a query restart. */
2446b7579f77SDag-Erling Smørgrav 		iq->deleg_msg = NULL;
2447b7579f77SDag-Erling Smørgrav 		iq->dp = NULL;
2448b7579f77SDag-Erling Smørgrav 		iq->dsns_point = NULL;
2449b7579f77SDag-Erling Smørgrav 		/* Note the query restart. */
2450b7579f77SDag-Erling Smørgrav 		iq->query_restart_count++;
2451b7579f77SDag-Erling Smørgrav 		iq->sent_count = 0;
2452b7579f77SDag-Erling Smørgrav 
2453b7579f77SDag-Erling Smørgrav 		/* stop current outstanding queries.
2454b7579f77SDag-Erling Smørgrav 		 * FIXME: should the outstanding queries be waited for and
2455b7579f77SDag-Erling Smørgrav 		 * handled? Say by a subquery that inherits the outbound_entry.
2456b7579f77SDag-Erling Smørgrav 		 */
2457b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
2458b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
2459b7579f77SDag-Erling Smørgrav 		fptr_ok(fptr_whitelist_modenv_detach_subs(
2460b7579f77SDag-Erling Smørgrav 			qstate->env->detach_subs));
2461b7579f77SDag-Erling Smørgrav 		(*qstate->env->detach_subs)(qstate);
2462b7579f77SDag-Erling Smørgrav 		iq->num_target_queries = 0;
2463b7579f77SDag-Erling Smørgrav 		if(qstate->reply)
2464b7579f77SDag-Erling Smørgrav 			sock_list_insert(&qstate->reply_origin,
2465b7579f77SDag-Erling Smørgrav 				&qstate->reply->addr, qstate->reply->addrlen,
2466b7579f77SDag-Erling Smørgrav 				qstate->region);
2467b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "cleared outbound list for query restart");
2468b7579f77SDag-Erling Smørgrav 		/* go to INIT_REQUEST_STATE for new qname. */
2469b7579f77SDag-Erling Smørgrav 		return next_state(iq, INIT_REQUEST_STATE);
2470b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_LAME) {
2471b7579f77SDag-Erling Smørgrav 		/* Cache the LAMEness. */
2472b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was %sLAME",
2473b7579f77SDag-Erling Smørgrav 			dnsseclame?"DNSSEC ":"");
2474b7579f77SDag-Erling Smørgrav 		if(!dname_subdomain_c(iq->qchase.qname, iq->dp->name)) {
2475b7579f77SDag-Erling Smørgrav 			log_err("mark lame: mismatch in qname and dpname");
2476b7579f77SDag-Erling Smørgrav 			/* throwaway this reply below */
2477b7579f77SDag-Erling Smørgrav 		} else if(qstate->reply) {
2478b7579f77SDag-Erling Smørgrav 			/* need addr for lameness cache, but we may have
2479b7579f77SDag-Erling Smørgrav 			 * gotten this from cache, so test to be sure */
2480b7579f77SDag-Erling Smørgrav 			if(!infra_set_lame(qstate->env->infra_cache,
2481b7579f77SDag-Erling Smørgrav 				&qstate->reply->addr, qstate->reply->addrlen,
2482b7579f77SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
2483b7579f77SDag-Erling Smørgrav 				*qstate->env->now, dnsseclame, 0,
2484b7579f77SDag-Erling Smørgrav 				iq->qchase.qtype))
2485b7579f77SDag-Erling Smørgrav 				log_err("mark host lame: out of memory");
248617d15b25SDag-Erling Smørgrav 		}
2487b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_REC_LAME) {
2488b7579f77SDag-Erling Smørgrav 		/* Cache the LAMEness. */
2489b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response REC_LAME: "
2490b7579f77SDag-Erling Smørgrav 			"recursive but not authoritative server");
2491b7579f77SDag-Erling Smørgrav 		if(!dname_subdomain_c(iq->qchase.qname, iq->dp->name)) {
2492b7579f77SDag-Erling Smørgrav 			log_err("mark rec_lame: mismatch in qname and dpname");
2493b7579f77SDag-Erling Smørgrav 			/* throwaway this reply below */
2494b7579f77SDag-Erling Smørgrav 		} else if(qstate->reply) {
2495b7579f77SDag-Erling Smørgrav 			/* need addr for lameness cache, but we may have
2496b7579f77SDag-Erling Smørgrav 			 * gotten this from cache, so test to be sure */
2497b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "mark as REC_LAME");
2498b7579f77SDag-Erling Smørgrav 			if(!infra_set_lame(qstate->env->infra_cache,
2499b7579f77SDag-Erling Smørgrav 				&qstate->reply->addr, qstate->reply->addrlen,
2500b7579f77SDag-Erling Smørgrav 				iq->dp->name, iq->dp->namelen,
2501b7579f77SDag-Erling Smørgrav 				*qstate->env->now, 0, 1, iq->qchase.qtype))
2502b7579f77SDag-Erling Smørgrav 				log_err("mark host lame: out of memory");
2503b7579f77SDag-Erling Smørgrav 		}
2504b7579f77SDag-Erling Smørgrav 	} else if(type == RESPONSE_TYPE_THROWAWAY) {
2505b7579f77SDag-Erling Smørgrav 		/* LAME and THROWAWAY responses are handled the same way.
2506b7579f77SDag-Erling Smørgrav 		 * In this case, the event is just sent directly back to
2507b7579f77SDag-Erling Smørgrav 		 * the QUERYTARGETS_STATE without resetting anything,
2508b7579f77SDag-Erling Smørgrav 		 * because, clearly, the next target must be tried. */
2509b7579f77SDag-Erling Smørgrav 		verbose(VERB_DETAIL, "query response was THROWAWAY");
2510b7579f77SDag-Erling Smørgrav 	} else {
2511b7579f77SDag-Erling Smørgrav 		log_warn("A query response came back with an unknown type: %d",
2512b7579f77SDag-Erling Smørgrav 			(int)type);
2513b7579f77SDag-Erling Smørgrav 	}
2514b7579f77SDag-Erling Smørgrav 
2515b7579f77SDag-Erling Smørgrav 	/* LAME, THROWAWAY and "unknown" all end up here.
2516b7579f77SDag-Erling Smørgrav 	 * Recycle to the QUERYTARGETS state to hopefully try a
2517b7579f77SDag-Erling Smørgrav 	 * different target. */
251805ab2901SDag-Erling Smørgrav 	if (qstate->env->cfg->qname_minimisation)
251905ab2901SDag-Erling Smørgrav 		iq->minimisation_state = DONOT_MINIMISE_STATE;
2520b7579f77SDag-Erling Smørgrav 	return next_state(iq, QUERYTARGETS_STATE);
2521b7579f77SDag-Erling Smørgrav }
2522b7579f77SDag-Erling Smørgrav 
2523b7579f77SDag-Erling Smørgrav /**
2524ff825849SDag-Erling Smørgrav  * Return priming query results to interested super querystates.
2525b7579f77SDag-Erling Smørgrav  *
2526b7579f77SDag-Erling Smørgrav  * Sets the delegation point and delegation message (not nonRD queries).
2527b7579f77SDag-Erling Smørgrav  * This is a callback from walk_supers.
2528b7579f77SDag-Erling Smørgrav  *
2529b7579f77SDag-Erling Smørgrav  * @param qstate: priming query state that finished.
2530b7579f77SDag-Erling Smørgrav  * @param id: module id.
2531b7579f77SDag-Erling Smørgrav  * @param forq: the qstate for which priming has been done.
2532b7579f77SDag-Erling Smørgrav  */
2533b7579f77SDag-Erling Smørgrav static void
2534b7579f77SDag-Erling Smørgrav prime_supers(struct module_qstate* qstate, int id, struct module_qstate* forq)
2535b7579f77SDag-Erling Smørgrav {
2536b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
2537b7579f77SDag-Erling Smørgrav 	struct delegpt* dp = NULL;
2538b7579f77SDag-Erling Smørgrav 
2539b7579f77SDag-Erling Smørgrav 	log_assert(qstate->is_priming || foriq->wait_priming_stub);
2540b7579f77SDag-Erling Smørgrav 	log_assert(qstate->return_rcode == LDNS_RCODE_NOERROR);
2541b7579f77SDag-Erling Smørgrav 	/* Convert our response to a delegation point */
2542b7579f77SDag-Erling Smørgrav 	dp = delegpt_from_message(qstate->return_msg, forq->region);
2543b7579f77SDag-Erling Smørgrav 	if(!dp) {
2544b7579f77SDag-Erling Smørgrav 		/* if there is no convertable delegation point, then
2545b7579f77SDag-Erling Smørgrav 		 * the ANSWER type was (presumably) a negative answer. */
2546b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "prime response was not a positive "
2547b7579f77SDag-Erling Smørgrav 			"ANSWER; failing");
2548b7579f77SDag-Erling Smørgrav 		foriq->dp = NULL;
2549b7579f77SDag-Erling Smørgrav 		foriq->state = QUERYTARGETS_STATE;
2550b7579f77SDag-Erling Smørgrav 		return;
2551b7579f77SDag-Erling Smørgrav 	}
2552b7579f77SDag-Erling Smørgrav 
2553b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_DETAIL, "priming successful for", &qstate->qinfo);
2554b7579f77SDag-Erling Smørgrav 	delegpt_log(VERB_ALGO, dp);
2555b7579f77SDag-Erling Smørgrav 	foriq->dp = dp;
2556b7579f77SDag-Erling Smørgrav 	foriq->deleg_msg = dns_copy_msg(qstate->return_msg, forq->region);
2557b7579f77SDag-Erling Smørgrav 	if(!foriq->deleg_msg) {
2558b7579f77SDag-Erling Smørgrav 		log_err("copy prime response: out of memory");
2559b7579f77SDag-Erling Smørgrav 		foriq->dp = NULL;
2560b7579f77SDag-Erling Smørgrav 		foriq->state = QUERYTARGETS_STATE;
2561b7579f77SDag-Erling Smørgrav 		return;
2562b7579f77SDag-Erling Smørgrav 	}
2563b7579f77SDag-Erling Smørgrav 
2564b7579f77SDag-Erling Smørgrav 	/* root priming responses go to init stage 2, priming stub
2565b7579f77SDag-Erling Smørgrav 	 * responses to to stage 3. */
2566b7579f77SDag-Erling Smørgrav 	if(foriq->wait_priming_stub) {
2567b7579f77SDag-Erling Smørgrav 		foriq->state = INIT_REQUEST_3_STATE;
2568b7579f77SDag-Erling Smørgrav 		foriq->wait_priming_stub = 0;
2569b7579f77SDag-Erling Smørgrav 	} else	foriq->state = INIT_REQUEST_2_STATE;
2570b7579f77SDag-Erling Smørgrav 	/* because we are finished, the parent will be reactivated */
2571b7579f77SDag-Erling Smørgrav }
2572b7579f77SDag-Erling Smørgrav 
2573b7579f77SDag-Erling Smørgrav /**
2574b7579f77SDag-Erling Smørgrav  * This handles the response to a priming query. This is used to handle both
2575b7579f77SDag-Erling Smørgrav  * root and stub priming responses. This is basically the equivalent of the
2576b7579f77SDag-Erling Smørgrav  * QUERY_RESP_STATE, but will not handle CNAME responses and will treat
2577b7579f77SDag-Erling Smørgrav  * REFERRALs as ANSWERS. It will also update and reactivate the originating
2578b7579f77SDag-Erling Smørgrav  * event.
2579b7579f77SDag-Erling Smørgrav  *
2580b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2581b7579f77SDag-Erling Smørgrav  * @param id: module id.
2582b7579f77SDag-Erling Smørgrav  * @return true if the event needs more immediate processing, false if not.
2583b7579f77SDag-Erling Smørgrav  *         This state always returns false.
2584b7579f77SDag-Erling Smørgrav  */
2585b7579f77SDag-Erling Smørgrav static int
2586b7579f77SDag-Erling Smørgrav processPrimeResponse(struct module_qstate* qstate, int id)
2587b7579f77SDag-Erling Smørgrav {
2588b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
2589b7579f77SDag-Erling Smørgrav 	enum response_type type;
2590b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags &= ~(BIT_RD|BIT_RA); /* ignore rec-lame */
2591b7579f77SDag-Erling Smørgrav 	type = response_type_from_server(
2592b7579f77SDag-Erling Smørgrav 		(int)((iq->chase_flags&BIT_RD) || iq->chase_to_rd),
2593b7579f77SDag-Erling Smørgrav 		iq->response, &iq->qchase, iq->dp);
2594b7579f77SDag-Erling Smørgrav 	if(type == RESPONSE_TYPE_ANSWER) {
2595b7579f77SDag-Erling Smørgrav 		qstate->return_rcode = LDNS_RCODE_NOERROR;
2596b7579f77SDag-Erling Smørgrav 		qstate->return_msg = iq->response;
2597b7579f77SDag-Erling Smørgrav 	} else {
2598b7579f77SDag-Erling Smørgrav 		qstate->return_rcode = LDNS_RCODE_SERVFAIL;
2599b7579f77SDag-Erling Smørgrav 		qstate->return_msg = NULL;
2600b7579f77SDag-Erling Smørgrav 	}
2601b7579f77SDag-Erling Smørgrav 
2602b7579f77SDag-Erling Smørgrav 	/* validate the root or stub after priming (if enabled).
2603b7579f77SDag-Erling Smørgrav 	 * This is the same query as the prime query, but with validation.
2604b7579f77SDag-Erling Smørgrav 	 * Now that we are primed, the additional queries that validation
2605b7579f77SDag-Erling Smørgrav 	 * may need can be resolved, such as DLV. */
2606b7579f77SDag-Erling Smørgrav 	if(qstate->env->cfg->harden_referral_path) {
2607b7579f77SDag-Erling Smørgrav 		struct module_qstate* subq = NULL;
2608b7579f77SDag-Erling Smørgrav 		log_nametypeclass(VERB_ALGO, "schedule prime validation",
2609b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qname, qstate->qinfo.qtype,
2610b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qclass);
2611b7579f77SDag-Erling Smørgrav 		if(!generate_sub_request(qstate->qinfo.qname,
2612b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qname_len, qstate->qinfo.qtype,
2613b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qclass, qstate, id, iq,
2614b7579f77SDag-Erling Smørgrav 			INIT_REQUEST_STATE, FINISHED_STATE, &subq, 1)) {
2615b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "could not generate prime check");
2616b7579f77SDag-Erling Smørgrav 		}
2617b7579f77SDag-Erling Smørgrav 		generate_a_aaaa_check(qstate, iq, id);
2618b7579f77SDag-Erling Smørgrav 	}
2619b7579f77SDag-Erling Smørgrav 
2620b7579f77SDag-Erling Smørgrav 	/* This event is finished. */
2621b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_finished;
2622b7579f77SDag-Erling Smørgrav 	return 0;
2623b7579f77SDag-Erling Smørgrav }
2624b7579f77SDag-Erling Smørgrav 
2625b7579f77SDag-Erling Smørgrav /**
2626b7579f77SDag-Erling Smørgrav  * Do final processing on responses to target queries. Events reach this
2627b7579f77SDag-Erling Smørgrav  * state after the iterative resolution algorithm terminates. This state is
2628b7579f77SDag-Erling Smørgrav  * responsible for reactiving the original event, and housekeeping related
2629b7579f77SDag-Erling Smørgrav  * to received target responses (caching, updating the current delegation
2630b7579f77SDag-Erling Smørgrav  * point, etc).
2631b7579f77SDag-Erling Smørgrav  * Callback from walk_supers for every super state that is interested in
2632b7579f77SDag-Erling Smørgrav  * the results from this query.
2633b7579f77SDag-Erling Smørgrav  *
2634b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2635b7579f77SDag-Erling Smørgrav  * @param id: module id.
2636b7579f77SDag-Erling Smørgrav  * @param forq: super query state.
2637b7579f77SDag-Erling Smørgrav  */
2638b7579f77SDag-Erling Smørgrav static void
2639b7579f77SDag-Erling Smørgrav processTargetResponse(struct module_qstate* qstate, int id,
2640b7579f77SDag-Erling Smørgrav 	struct module_qstate* forq)
2641b7579f77SDag-Erling Smørgrav {
2642b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
2643b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
2644b7579f77SDag-Erling Smørgrav 	struct ub_packed_rrset_key* rrset;
2645b7579f77SDag-Erling Smørgrav 	struct delegpt_ns* dpns;
2646b7579f77SDag-Erling Smørgrav 	log_assert(qstate->return_rcode == LDNS_RCODE_NOERROR);
2647b7579f77SDag-Erling Smørgrav 
2648b7579f77SDag-Erling Smørgrav 	foriq->state = QUERYTARGETS_STATE;
2649b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processTargetResponse", &qstate->qinfo);
2650b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processTargetResponse super", &forq->qinfo);
2651b7579f77SDag-Erling Smørgrav 
2652b7579f77SDag-Erling Smørgrav 	/* check to see if parent event is still interested (in orig name).  */
2653b7579f77SDag-Erling Smørgrav 	if(!foriq->dp) {
2654b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "subq: parent not interested, was reset");
2655b7579f77SDag-Erling Smørgrav 		return; /* not interested anymore */
2656b7579f77SDag-Erling Smørgrav 	}
2657b7579f77SDag-Erling Smørgrav 	dpns = delegpt_find_ns(foriq->dp, qstate->qinfo.qname,
2658b7579f77SDag-Erling Smørgrav 			qstate->qinfo.qname_len);
2659b7579f77SDag-Erling Smørgrav 	if(!dpns) {
2660b7579f77SDag-Erling Smørgrav 		/* If not interested, just stop processing this event */
2661b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "subq: parent not interested anymore");
2662b7579f77SDag-Erling Smørgrav 		/* could be because parent was jostled out of the cache,
2663b7579f77SDag-Erling Smørgrav 		   and a new identical query arrived, that does not want it*/
2664b7579f77SDag-Erling Smørgrav 		return;
2665b7579f77SDag-Erling Smørgrav 	}
2666b7579f77SDag-Erling Smørgrav 
2667b7579f77SDag-Erling Smørgrav 	/* Tell the originating event that this target query has finished
2668b7579f77SDag-Erling Smørgrav 	 * (regardless if it succeeded or not). */
2669b7579f77SDag-Erling Smørgrav 	foriq->num_target_queries--;
2670b7579f77SDag-Erling Smørgrav 
2671b7579f77SDag-Erling Smørgrav 	/* if iq->query_for_pside_glue then add the pside_glue (marked lame) */
2672b7579f77SDag-Erling Smørgrav 	if(iq->pside_glue) {
2673b7579f77SDag-Erling Smørgrav 		/* if the pside_glue is NULL, then it could not be found,
2674b7579f77SDag-Erling Smørgrav 		 * the done_pside is already set when created and a cache
2675b7579f77SDag-Erling Smørgrav 		 * entry created in processFinished so nothing to do here */
2676b7579f77SDag-Erling Smørgrav 		log_rrset_key(VERB_ALGO, "add parentside glue to dp",
2677b7579f77SDag-Erling Smørgrav 			iq->pside_glue);
2678b7579f77SDag-Erling Smørgrav 		if(!delegpt_add_rrset(foriq->dp, forq->region,
2679b7579f77SDag-Erling Smørgrav 			iq->pside_glue, 1))
2680b7579f77SDag-Erling Smørgrav 			log_err("out of memory adding pside glue");
2681b7579f77SDag-Erling Smørgrav 	}
2682b7579f77SDag-Erling Smørgrav 
2683b7579f77SDag-Erling Smørgrav 	/* This response is relevant to the current query, so we
2684b7579f77SDag-Erling Smørgrav 	 * add (attempt to add, anyway) this target(s) and reactivate
2685b7579f77SDag-Erling Smørgrav 	 * the original event.
2686b7579f77SDag-Erling Smørgrav 	 * NOTE: we could only look for the AnswerRRset if the
2687b7579f77SDag-Erling Smørgrav 	 * response type was ANSWER. */
2688b7579f77SDag-Erling Smørgrav 	rrset = reply_find_answer_rrset(&iq->qchase, qstate->return_msg->rep);
2689b7579f77SDag-Erling Smørgrav 	if(rrset) {
2690b7579f77SDag-Erling Smørgrav 		/* if CNAMEs have been followed - add new NS to delegpt. */
2691b7579f77SDag-Erling Smørgrav 		/* BTW. RFC 1918 says NS should not have got CNAMEs. Robust. */
2692b7579f77SDag-Erling Smørgrav 		if(!delegpt_find_ns(foriq->dp, rrset->rk.dname,
2693b7579f77SDag-Erling Smørgrav 			rrset->rk.dname_len)) {
2694b7579f77SDag-Erling Smørgrav 			/* if dpns->lame then set newcname ns lame too */
2695b7579f77SDag-Erling Smørgrav 			if(!delegpt_add_ns(foriq->dp, forq->region,
269617d15b25SDag-Erling Smørgrav 				rrset->rk.dname, dpns->lame))
2697b7579f77SDag-Erling Smørgrav 				log_err("out of memory adding cnamed-ns");
2698b7579f77SDag-Erling Smørgrav 		}
2699b7579f77SDag-Erling Smørgrav 		/* if dpns->lame then set the address(es) lame too */
2700b7579f77SDag-Erling Smørgrav 		if(!delegpt_add_rrset(foriq->dp, forq->region, rrset,
270117d15b25SDag-Erling Smørgrav 			dpns->lame))
2702b7579f77SDag-Erling Smørgrav 			log_err("out of memory adding targets");
2703b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "added target response");
2704b7579f77SDag-Erling Smørgrav 		delegpt_log(VERB_ALGO, foriq->dp);
2705b7579f77SDag-Erling Smørgrav 	} else {
2706b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "iterator TargetResponse failed");
2707b7579f77SDag-Erling Smørgrav 		dpns->resolved = 1; /* fail the target */
2708b7579f77SDag-Erling Smørgrav 	}
2709b7579f77SDag-Erling Smørgrav }
2710b7579f77SDag-Erling Smørgrav 
2711b7579f77SDag-Erling Smørgrav /**
2712b7579f77SDag-Erling Smørgrav  * Process response for DS NS Find queries, that attempt to find the delegation
2713b7579f77SDag-Erling Smørgrav  * point where we ask the DS query from.
2714b7579f77SDag-Erling Smørgrav  *
2715b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2716b7579f77SDag-Erling Smørgrav  * @param id: module id.
2717b7579f77SDag-Erling Smørgrav  * @param forq: super query state.
2718b7579f77SDag-Erling Smørgrav  */
2719b7579f77SDag-Erling Smørgrav static void
2720b7579f77SDag-Erling Smørgrav processDSNSResponse(struct module_qstate* qstate, int id,
2721b7579f77SDag-Erling Smørgrav 	struct module_qstate* forq)
2722b7579f77SDag-Erling Smørgrav {
2723b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
2724b7579f77SDag-Erling Smørgrav 
2725b7579f77SDag-Erling Smørgrav 	/* if the finished (iq->response) query has no NS set: continue
2726b7579f77SDag-Erling Smørgrav 	 * up to look for the right dp; nothing to change, do DPNSstate */
2727b7579f77SDag-Erling Smørgrav 	if(qstate->return_rcode != LDNS_RCODE_NOERROR)
2728b7579f77SDag-Erling Smørgrav 		return; /* seek further */
2729b7579f77SDag-Erling Smørgrav 	/* find the NS RRset (without allowing CNAMEs) */
2730b7579f77SDag-Erling Smørgrav 	if(!reply_find_rrset(qstate->return_msg->rep, qstate->qinfo.qname,
2731b7579f77SDag-Erling Smørgrav 		qstate->qinfo.qname_len, LDNS_RR_TYPE_NS,
2732b7579f77SDag-Erling Smørgrav 		qstate->qinfo.qclass)){
2733b7579f77SDag-Erling Smørgrav 		return; /* seek further */
2734b7579f77SDag-Erling Smørgrav 	}
2735b7579f77SDag-Erling Smørgrav 
2736b7579f77SDag-Erling Smørgrav 	/* else, store as DP and continue at querytargets */
2737b7579f77SDag-Erling Smørgrav 	foriq->state = QUERYTARGETS_STATE;
2738b7579f77SDag-Erling Smørgrav 	foriq->dp = delegpt_from_message(qstate->return_msg, forq->region);
2739b7579f77SDag-Erling Smørgrav 	if(!foriq->dp) {
2740b7579f77SDag-Erling Smørgrav 		log_err("out of memory in dsns dp alloc");
2741b7579f77SDag-Erling Smørgrav 		return; /* dp==NULL in QUERYTARGETS makes SERVFAIL */
2742b7579f77SDag-Erling Smørgrav 	}
2743b7579f77SDag-Erling Smørgrav 	/* success, go query the querytargets in the new dp (and go down) */
2744b7579f77SDag-Erling Smørgrav }
2745b7579f77SDag-Erling Smørgrav 
2746b7579f77SDag-Erling Smørgrav /**
2747b7579f77SDag-Erling Smørgrav  * Process response for qclass=ANY queries for a particular class.
2748b7579f77SDag-Erling Smørgrav  * Append to result or error-exit.
2749b7579f77SDag-Erling Smørgrav  *
2750b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2751b7579f77SDag-Erling Smørgrav  * @param id: module id.
2752b7579f77SDag-Erling Smørgrav  * @param forq: super query state.
2753b7579f77SDag-Erling Smørgrav  */
2754b7579f77SDag-Erling Smørgrav static void
2755b7579f77SDag-Erling Smørgrav processClassResponse(struct module_qstate* qstate, int id,
2756b7579f77SDag-Erling Smørgrav 	struct module_qstate* forq)
2757b7579f77SDag-Erling Smørgrav {
2758b7579f77SDag-Erling Smørgrav 	struct iter_qstate* foriq = (struct iter_qstate*)forq->minfo[id];
2759b7579f77SDag-Erling Smørgrav 	struct dns_msg* from = qstate->return_msg;
2760b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processClassResponse", &qstate->qinfo);
2761b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_ALGO, "processClassResponse super", &forq->qinfo);
2762b7579f77SDag-Erling Smørgrav 	if(qstate->return_rcode != LDNS_RCODE_NOERROR) {
2763b7579f77SDag-Erling Smørgrav 		/* cause servfail for qclass ANY query */
2764b7579f77SDag-Erling Smørgrav 		foriq->response = NULL;
2765b7579f77SDag-Erling Smørgrav 		foriq->state = FINISHED_STATE;
2766b7579f77SDag-Erling Smørgrav 		return;
2767b7579f77SDag-Erling Smørgrav 	}
2768b7579f77SDag-Erling Smørgrav 	/* append result */
2769b7579f77SDag-Erling Smørgrav 	if(!foriq->response) {
2770b7579f77SDag-Erling Smørgrav 		/* allocate the response: copy RCODE, sec_state */
2771b7579f77SDag-Erling Smørgrav 		foriq->response = dns_copy_msg(from, forq->region);
2772b7579f77SDag-Erling Smørgrav 		if(!foriq->response) {
2773b7579f77SDag-Erling Smørgrav 			log_err("malloc failed for qclass ANY response");
2774b7579f77SDag-Erling Smørgrav 			foriq->state = FINISHED_STATE;
2775b7579f77SDag-Erling Smørgrav 			return;
2776b7579f77SDag-Erling Smørgrav 		}
2777b7579f77SDag-Erling Smørgrav 		foriq->response->qinfo.qclass = forq->qinfo.qclass;
2778b7579f77SDag-Erling Smørgrav 		/* qclass ANY does not receive the AA flag on replies */
2779b7579f77SDag-Erling Smørgrav 		foriq->response->rep->authoritative = 0;
2780b7579f77SDag-Erling Smørgrav 	} else {
2781b7579f77SDag-Erling Smørgrav 		struct dns_msg* to = foriq->response;
2782b7579f77SDag-Erling Smørgrav 		/* add _from_ this response _to_ existing collection */
2783b7579f77SDag-Erling Smørgrav 		/* if there are records, copy RCODE */
2784b7579f77SDag-Erling Smørgrav 		/* lower sec_state if this message is lower */
2785b7579f77SDag-Erling Smørgrav 		if(from->rep->rrset_count != 0) {
2786b7579f77SDag-Erling Smørgrav 			size_t n = from->rep->rrset_count+to->rep->rrset_count;
2787b7579f77SDag-Erling Smørgrav 			struct ub_packed_rrset_key** dest, **d;
2788b7579f77SDag-Erling Smørgrav 			/* copy appropriate rcode */
2789b7579f77SDag-Erling Smørgrav 			to->rep->flags = from->rep->flags;
2790b7579f77SDag-Erling Smørgrav 			/* copy rrsets */
279109a3aaf3SDag-Erling Smørgrav 			if(from->rep->rrset_count > RR_COUNT_MAX ||
279209a3aaf3SDag-Erling Smørgrav 				to->rep->rrset_count > RR_COUNT_MAX) {
279309a3aaf3SDag-Erling Smørgrav 				log_err("malloc failed (too many rrsets) in collect ANY");
279409a3aaf3SDag-Erling Smørgrav 				foriq->state = FINISHED_STATE;
279509a3aaf3SDag-Erling Smørgrav 				return; /* integer overflow protection */
279609a3aaf3SDag-Erling Smørgrav 			}
2797b7579f77SDag-Erling Smørgrav 			dest = regional_alloc(forq->region, sizeof(dest[0])*n);
2798b7579f77SDag-Erling Smørgrav 			if(!dest) {
2799b7579f77SDag-Erling Smørgrav 				log_err("malloc failed in collect ANY");
2800b7579f77SDag-Erling Smørgrav 				foriq->state = FINISHED_STATE;
2801b7579f77SDag-Erling Smørgrav 				return;
2802b7579f77SDag-Erling Smørgrav 			}
2803b7579f77SDag-Erling Smørgrav 			d = dest;
2804b7579f77SDag-Erling Smørgrav 			/* copy AN */
2805b7579f77SDag-Erling Smørgrav 			memcpy(dest, to->rep->rrsets, to->rep->an_numrrsets
2806b7579f77SDag-Erling Smørgrav 				* sizeof(dest[0]));
2807b7579f77SDag-Erling Smørgrav 			dest += to->rep->an_numrrsets;
2808b7579f77SDag-Erling Smørgrav 			memcpy(dest, from->rep->rrsets, from->rep->an_numrrsets
2809b7579f77SDag-Erling Smørgrav 				* sizeof(dest[0]));
2810b7579f77SDag-Erling Smørgrav 			dest += from->rep->an_numrrsets;
2811b7579f77SDag-Erling Smørgrav 			/* copy NS */
2812b7579f77SDag-Erling Smørgrav 			memcpy(dest, to->rep->rrsets+to->rep->an_numrrsets,
2813b7579f77SDag-Erling Smørgrav 				to->rep->ns_numrrsets * sizeof(dest[0]));
2814b7579f77SDag-Erling Smørgrav 			dest += to->rep->ns_numrrsets;
2815b7579f77SDag-Erling Smørgrav 			memcpy(dest, from->rep->rrsets+from->rep->an_numrrsets,
2816b7579f77SDag-Erling Smørgrav 				from->rep->ns_numrrsets * sizeof(dest[0]));
2817b7579f77SDag-Erling Smørgrav 			dest += from->rep->ns_numrrsets;
2818b7579f77SDag-Erling Smørgrav 			/* copy AR */
2819b7579f77SDag-Erling Smørgrav 			memcpy(dest, to->rep->rrsets+to->rep->an_numrrsets+
2820b7579f77SDag-Erling Smørgrav 				to->rep->ns_numrrsets,
2821b7579f77SDag-Erling Smørgrav 				to->rep->ar_numrrsets * sizeof(dest[0]));
2822b7579f77SDag-Erling Smørgrav 			dest += to->rep->ar_numrrsets;
2823b7579f77SDag-Erling Smørgrav 			memcpy(dest, from->rep->rrsets+from->rep->an_numrrsets+
2824b7579f77SDag-Erling Smørgrav 				from->rep->ns_numrrsets,
2825b7579f77SDag-Erling Smørgrav 				from->rep->ar_numrrsets * sizeof(dest[0]));
2826b7579f77SDag-Erling Smørgrav 			/* update counts */
2827b7579f77SDag-Erling Smørgrav 			to->rep->rrsets = d;
2828b7579f77SDag-Erling Smørgrav 			to->rep->an_numrrsets += from->rep->an_numrrsets;
2829b7579f77SDag-Erling Smørgrav 			to->rep->ns_numrrsets += from->rep->ns_numrrsets;
2830b7579f77SDag-Erling Smørgrav 			to->rep->ar_numrrsets += from->rep->ar_numrrsets;
2831b7579f77SDag-Erling Smørgrav 			to->rep->rrset_count = n;
2832b7579f77SDag-Erling Smørgrav 		}
2833b7579f77SDag-Erling Smørgrav 		if(from->rep->security < to->rep->security) /* lowest sec */
2834b7579f77SDag-Erling Smørgrav 			to->rep->security = from->rep->security;
2835b7579f77SDag-Erling Smørgrav 		if(from->rep->qdcount != 0) /* insert qd if appropriate */
2836b7579f77SDag-Erling Smørgrav 			to->rep->qdcount = from->rep->qdcount;
2837b7579f77SDag-Erling Smørgrav 		if(from->rep->ttl < to->rep->ttl) /* use smallest TTL */
2838b7579f77SDag-Erling Smørgrav 			to->rep->ttl = from->rep->ttl;
2839b7579f77SDag-Erling Smørgrav 		if(from->rep->prefetch_ttl < to->rep->prefetch_ttl)
2840b7579f77SDag-Erling Smørgrav 			to->rep->prefetch_ttl = from->rep->prefetch_ttl;
2841b7579f77SDag-Erling Smørgrav 	}
2842b7579f77SDag-Erling Smørgrav 	/* are we done? */
2843b7579f77SDag-Erling Smørgrav 	foriq->num_current_queries --;
2844b7579f77SDag-Erling Smørgrav 	if(foriq->num_current_queries == 0)
2845b7579f77SDag-Erling Smørgrav 		foriq->state = FINISHED_STATE;
2846b7579f77SDag-Erling Smørgrav }
2847b7579f77SDag-Erling Smørgrav 
2848b7579f77SDag-Erling Smørgrav /**
2849b7579f77SDag-Erling Smørgrav  * Collect class ANY responses and make them into one response.  This
2850b7579f77SDag-Erling Smørgrav  * state is started and it creates queries for all classes (that have
2851b7579f77SDag-Erling Smørgrav  * root hints).  The answers are then collected.
2852b7579f77SDag-Erling Smørgrav  *
2853b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2854b7579f77SDag-Erling Smørgrav  * @param id: module id.
2855b7579f77SDag-Erling Smørgrav  * @return true if the event needs more immediate processing, false if not.
2856b7579f77SDag-Erling Smørgrav  */
2857b7579f77SDag-Erling Smørgrav static int
2858b7579f77SDag-Erling Smørgrav processCollectClass(struct module_qstate* qstate, int id)
2859b7579f77SDag-Erling Smørgrav {
2860b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
2861b7579f77SDag-Erling Smørgrav 	struct module_qstate* subq;
2862b7579f77SDag-Erling Smørgrav 	/* If qchase.qclass == 0 then send out queries for all classes.
2863b7579f77SDag-Erling Smørgrav 	 * Otherwise, do nothing (wait for all answers to arrive and the
2864b7579f77SDag-Erling Smørgrav 	 * processClassResponse to put them together, and that moves us
2865b7579f77SDag-Erling Smørgrav 	 * towards the Finished state when done. */
2866b7579f77SDag-Erling Smørgrav 	if(iq->qchase.qclass == 0) {
2867b7579f77SDag-Erling Smørgrav 		uint16_t c = 0;
2868b7579f77SDag-Erling Smørgrav 		iq->qchase.qclass = LDNS_RR_CLASS_ANY;
2869b7579f77SDag-Erling Smørgrav 		while(iter_get_next_root(qstate->env->hints,
2870b7579f77SDag-Erling Smørgrav 			qstate->env->fwds, &c)) {
2871b7579f77SDag-Erling Smørgrav 			/* generate query for this class */
2872b7579f77SDag-Erling Smørgrav 			log_nametypeclass(VERB_ALGO, "spawn collect query",
2873b7579f77SDag-Erling Smørgrav 				qstate->qinfo.qname, qstate->qinfo.qtype, c);
2874b7579f77SDag-Erling Smørgrav 			if(!generate_sub_request(qstate->qinfo.qname,
2875b7579f77SDag-Erling Smørgrav 				qstate->qinfo.qname_len, qstate->qinfo.qtype,
2876b7579f77SDag-Erling Smørgrav 				c, qstate, id, iq, INIT_REQUEST_STATE,
2877b7579f77SDag-Erling Smørgrav 				FINISHED_STATE, &subq,
2878b7579f77SDag-Erling Smørgrav 				(int)!(qstate->query_flags&BIT_CD))) {
2879b7579f77SDag-Erling Smørgrav 				return error_response(qstate, id,
2880b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
2881b7579f77SDag-Erling Smørgrav 			}
2882b7579f77SDag-Erling Smørgrav 			/* ignore subq, no special init required */
2883b7579f77SDag-Erling Smørgrav 			iq->num_current_queries ++;
2884b7579f77SDag-Erling Smørgrav 			if(c == 0xffff)
2885b7579f77SDag-Erling Smørgrav 				break;
2886b7579f77SDag-Erling Smørgrav 			else c++;
2887b7579f77SDag-Erling Smørgrav 		}
2888b7579f77SDag-Erling Smørgrav 		/* if no roots are configured at all, return */
2889b7579f77SDag-Erling Smørgrav 		if(iq->num_current_queries == 0) {
2890b7579f77SDag-Erling Smørgrav 			verbose(VERB_ALGO, "No root hints or fwds, giving up "
2891b7579f77SDag-Erling Smørgrav 				"on qclass ANY");
2892b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_REFUSED);
2893b7579f77SDag-Erling Smørgrav 		}
2894b7579f77SDag-Erling Smørgrav 		/* return false, wait for queries to return */
2895b7579f77SDag-Erling Smørgrav 	}
2896b7579f77SDag-Erling Smørgrav 	/* if woke up here because of an answer, wait for more answers */
2897b7579f77SDag-Erling Smørgrav 	return 0;
2898b7579f77SDag-Erling Smørgrav }
2899b7579f77SDag-Erling Smørgrav 
2900b7579f77SDag-Erling Smørgrav /**
2901b7579f77SDag-Erling Smørgrav  * This handles the final state for first-tier responses (i.e., responses to
2902b7579f77SDag-Erling Smørgrav  * externally generated queries).
2903b7579f77SDag-Erling Smørgrav  *
2904b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
2905b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
2906b7579f77SDag-Erling Smørgrav  * @param id: module id.
2907b7579f77SDag-Erling Smørgrav  * @return true if the event needs more processing, false if not. Since this
2908b7579f77SDag-Erling Smørgrav  *         is the final state for an event, it always returns false.
2909b7579f77SDag-Erling Smørgrav  */
2910b7579f77SDag-Erling Smørgrav static int
2911b7579f77SDag-Erling Smørgrav processFinished(struct module_qstate* qstate, struct iter_qstate* iq,
2912b7579f77SDag-Erling Smørgrav 	int id)
2913b7579f77SDag-Erling Smørgrav {
2914b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_QUERY, "finishing processing for",
2915b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
2916b7579f77SDag-Erling Smørgrav 
2917b7579f77SDag-Erling Smørgrav 	/* store negative cache element for parent side glue. */
2918b7579f77SDag-Erling Smørgrav 	if(iq->query_for_pside_glue && !iq->pside_glue)
2919b7579f77SDag-Erling Smørgrav 		iter_store_parentside_neg(qstate->env, &qstate->qinfo,
2920b7579f77SDag-Erling Smørgrav 			iq->deleg_msg?iq->deleg_msg->rep:
2921b7579f77SDag-Erling Smørgrav 			(iq->response?iq->response->rep:NULL));
2922b7579f77SDag-Erling Smørgrav 	if(!iq->response) {
2923b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "No response is set, servfail");
2924b7579f77SDag-Erling Smørgrav 		return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2925b7579f77SDag-Erling Smørgrav 	}
2926b7579f77SDag-Erling Smørgrav 
2927b7579f77SDag-Erling Smørgrav 	/* Make sure that the RA flag is set (since the presence of
2928b7579f77SDag-Erling Smørgrav 	 * this module means that recursion is available) */
2929b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags |= BIT_RA;
2930b7579f77SDag-Erling Smørgrav 
2931b7579f77SDag-Erling Smørgrav 	/* Clear the AA flag */
2932b7579f77SDag-Erling Smørgrav 	/* FIXME: does this action go here or in some other module? */
2933b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags &= ~BIT_AA;
2934b7579f77SDag-Erling Smørgrav 
2935b7579f77SDag-Erling Smørgrav 	/* make sure QR flag is on */
2936b7579f77SDag-Erling Smørgrav 	iq->response->rep->flags |= BIT_QR;
2937b7579f77SDag-Erling Smørgrav 
2938b7579f77SDag-Erling Smørgrav 	/* we have finished processing this query */
2939b7579f77SDag-Erling Smørgrav 	qstate->ext_state[id] = module_finished;
2940b7579f77SDag-Erling Smørgrav 
2941b7579f77SDag-Erling Smørgrav 	/* TODO:  we are using a private TTL, trim the response. */
2942b7579f77SDag-Erling Smørgrav 	/* if (mPrivateTTL > 0){IterUtils.setPrivateTTL(resp, mPrivateTTL); } */
2943b7579f77SDag-Erling Smørgrav 
2944b7579f77SDag-Erling Smørgrav 	/* prepend any items we have accumulated */
2945b7579f77SDag-Erling Smørgrav 	if(iq->an_prepend_list || iq->ns_prepend_list) {
2946b7579f77SDag-Erling Smørgrav 		if(!iter_prepend(iq, iq->response, qstate->region)) {
2947b7579f77SDag-Erling Smørgrav 			log_err("prepend rrsets: out of memory");
2948b7579f77SDag-Erling Smørgrav 			return error_response(qstate, id, LDNS_RCODE_SERVFAIL);
2949b7579f77SDag-Erling Smørgrav 		}
2950b7579f77SDag-Erling Smørgrav 		/* reset the query name back */
2951b7579f77SDag-Erling Smørgrav 		iq->response->qinfo = qstate->qinfo;
2952b7579f77SDag-Erling Smørgrav 		/* the security state depends on the combination */
2953b7579f77SDag-Erling Smørgrav 		iq->response->rep->security = sec_status_unchecked;
2954b7579f77SDag-Erling Smørgrav 		/* store message with the finished prepended items,
2955b7579f77SDag-Erling Smørgrav 		 * but only if we did recursion. The nonrecursion referral
2956b7579f77SDag-Erling Smørgrav 		 * from cache does not need to be stored in the msg cache. */
2957b7579f77SDag-Erling Smørgrav 		if(qstate->query_flags&BIT_RD) {
29588ed2b524SDag-Erling Smørgrav 			iter_dns_store(qstate->env, &qstate->qinfo,
2959b7579f77SDag-Erling Smørgrav 				iq->response->rep, 0, qstate->prefetch_leeway,
2960b7579f77SDag-Erling Smørgrav 				iq->dp&&iq->dp->has_parent_side_NS,
2961ff825849SDag-Erling Smørgrav 				qstate->region, qstate->query_flags);
2962b7579f77SDag-Erling Smørgrav 		}
2963b7579f77SDag-Erling Smørgrav 	}
2964b7579f77SDag-Erling Smørgrav 	qstate->return_rcode = LDNS_RCODE_NOERROR;
2965b7579f77SDag-Erling Smørgrav 	qstate->return_msg = iq->response;
2966b7579f77SDag-Erling Smørgrav 	return 0;
2967b7579f77SDag-Erling Smørgrav }
2968b7579f77SDag-Erling Smørgrav 
2969b7579f77SDag-Erling Smørgrav /*
2970b7579f77SDag-Erling Smørgrav  * Return priming query results to interestes super querystates.
2971b7579f77SDag-Erling Smørgrav  *
2972b7579f77SDag-Erling Smørgrav  * Sets the delegation point and delegation message (not nonRD queries).
2973b7579f77SDag-Erling Smørgrav  * This is a callback from walk_supers.
2974b7579f77SDag-Erling Smørgrav  *
2975b7579f77SDag-Erling Smørgrav  * @param qstate: query state that finished.
2976b7579f77SDag-Erling Smørgrav  * @param id: module id.
2977b7579f77SDag-Erling Smørgrav  * @param super: the qstate to inform.
2978b7579f77SDag-Erling Smørgrav  */
2979b7579f77SDag-Erling Smørgrav void
2980b7579f77SDag-Erling Smørgrav iter_inform_super(struct module_qstate* qstate, int id,
2981b7579f77SDag-Erling Smørgrav 	struct module_qstate* super)
2982b7579f77SDag-Erling Smørgrav {
2983b7579f77SDag-Erling Smørgrav 	if(!qstate->is_priming && super->qinfo.qclass == LDNS_RR_CLASS_ANY)
2984b7579f77SDag-Erling Smørgrav 		processClassResponse(qstate, id, super);
2985b7579f77SDag-Erling Smørgrav 	else if(super->qinfo.qtype == LDNS_RR_TYPE_DS && ((struct iter_qstate*)
2986b7579f77SDag-Erling Smørgrav 		super->minfo[id])->state == DSNS_FIND_STATE)
2987b7579f77SDag-Erling Smørgrav 		processDSNSResponse(qstate, id, super);
2988b7579f77SDag-Erling Smørgrav 	else if(qstate->return_rcode != LDNS_RCODE_NOERROR)
2989b7579f77SDag-Erling Smørgrav 		error_supers(qstate, id, super);
2990b7579f77SDag-Erling Smørgrav 	else if(qstate->is_priming)
2991b7579f77SDag-Erling Smørgrav 		prime_supers(qstate, id, super);
2992b7579f77SDag-Erling Smørgrav 	else	processTargetResponse(qstate, id, super);
2993b7579f77SDag-Erling Smørgrav }
2994b7579f77SDag-Erling Smørgrav 
2995b7579f77SDag-Erling Smørgrav /**
2996b7579f77SDag-Erling Smørgrav  * Handle iterator state.
2997b7579f77SDag-Erling Smørgrav  * Handle events. This is the real processing loop for events, responsible
2998b7579f77SDag-Erling Smørgrav  * for moving events through the various states. If a processing method
2999b7579f77SDag-Erling Smørgrav  * returns true, then it will be advanced to the next state. If false, then
3000b7579f77SDag-Erling Smørgrav  * processing will stop.
3001b7579f77SDag-Erling Smørgrav  *
3002b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3003b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
3004b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
3005b7579f77SDag-Erling Smørgrav  * @param id: module id.
3006b7579f77SDag-Erling Smørgrav  */
3007b7579f77SDag-Erling Smørgrav static void
3008b7579f77SDag-Erling Smørgrav iter_handle(struct module_qstate* qstate, struct iter_qstate* iq,
3009b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
3010b7579f77SDag-Erling Smørgrav {
3011b7579f77SDag-Erling Smørgrav 	int cont = 1;
3012b7579f77SDag-Erling Smørgrav 	while(cont) {
3013b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "iter_handle processing q with state %s",
3014b7579f77SDag-Erling Smørgrav 			iter_state_to_string(iq->state));
3015b7579f77SDag-Erling Smørgrav 		switch(iq->state) {
3016b7579f77SDag-Erling Smørgrav 			case INIT_REQUEST_STATE:
3017b7579f77SDag-Erling Smørgrav 				cont = processInitRequest(qstate, iq, ie, id);
3018b7579f77SDag-Erling Smørgrav 				break;
3019b7579f77SDag-Erling Smørgrav 			case INIT_REQUEST_2_STATE:
3020b7579f77SDag-Erling Smørgrav 				cont = processInitRequest2(qstate, iq, id);
3021b7579f77SDag-Erling Smørgrav 				break;
3022b7579f77SDag-Erling Smørgrav 			case INIT_REQUEST_3_STATE:
3023b7579f77SDag-Erling Smørgrav 				cont = processInitRequest3(qstate, iq, id);
3024b7579f77SDag-Erling Smørgrav 				break;
3025b7579f77SDag-Erling Smørgrav 			case QUERYTARGETS_STATE:
3026b7579f77SDag-Erling Smørgrav 				cont = processQueryTargets(qstate, iq, ie, id);
3027b7579f77SDag-Erling Smørgrav 				break;
3028b7579f77SDag-Erling Smørgrav 			case QUERY_RESP_STATE:
3029b7579f77SDag-Erling Smørgrav 				cont = processQueryResponse(qstate, iq, id);
3030b7579f77SDag-Erling Smørgrav 				break;
3031b7579f77SDag-Erling Smørgrav 			case PRIME_RESP_STATE:
3032b7579f77SDag-Erling Smørgrav 				cont = processPrimeResponse(qstate, id);
3033b7579f77SDag-Erling Smørgrav 				break;
3034b7579f77SDag-Erling Smørgrav 			case COLLECT_CLASS_STATE:
3035b7579f77SDag-Erling Smørgrav 				cont = processCollectClass(qstate, id);
3036b7579f77SDag-Erling Smørgrav 				break;
3037b7579f77SDag-Erling Smørgrav 			case DSNS_FIND_STATE:
3038b7579f77SDag-Erling Smørgrav 				cont = processDSNSFind(qstate, iq, id);
3039b7579f77SDag-Erling Smørgrav 				break;
3040b7579f77SDag-Erling Smørgrav 			case FINISHED_STATE:
3041b7579f77SDag-Erling Smørgrav 				cont = processFinished(qstate, iq, id);
3042b7579f77SDag-Erling Smørgrav 				break;
3043b7579f77SDag-Erling Smørgrav 			default:
3044b7579f77SDag-Erling Smørgrav 				log_warn("iterator: invalid state: %d",
3045b7579f77SDag-Erling Smørgrav 					iq->state);
3046b7579f77SDag-Erling Smørgrav 				cont = 0;
3047b7579f77SDag-Erling Smørgrav 				break;
3048b7579f77SDag-Erling Smørgrav 		}
3049b7579f77SDag-Erling Smørgrav 	}
3050b7579f77SDag-Erling Smørgrav }
3051b7579f77SDag-Erling Smørgrav 
3052b7579f77SDag-Erling Smørgrav /**
3053b7579f77SDag-Erling Smørgrav  * This is the primary entry point for processing request events. Note that
3054b7579f77SDag-Erling Smørgrav  * this method should only be used by external modules.
3055b7579f77SDag-Erling Smørgrav  * @param qstate: query state.
3056b7579f77SDag-Erling Smørgrav  * @param ie: iterator shared global environment.
3057b7579f77SDag-Erling Smørgrav  * @param iq: iterator query state.
3058b7579f77SDag-Erling Smørgrav  * @param id: module id.
3059b7579f77SDag-Erling Smørgrav  */
3060b7579f77SDag-Erling Smørgrav static void
3061b7579f77SDag-Erling Smørgrav process_request(struct module_qstate* qstate, struct iter_qstate* iq,
3062b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id)
3063b7579f77SDag-Erling Smørgrav {
3064b7579f77SDag-Erling Smørgrav 	/* external requests start in the INIT state, and finish using the
3065b7579f77SDag-Erling Smørgrav 	 * FINISHED state. */
3066b7579f77SDag-Erling Smørgrav 	iq->state = INIT_REQUEST_STATE;
3067b7579f77SDag-Erling Smørgrav 	iq->final_state = FINISHED_STATE;
3068b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "process_request: new external request event");
3069b7579f77SDag-Erling Smørgrav 	iter_handle(qstate, iq, ie, id);
3070b7579f77SDag-Erling Smørgrav }
3071b7579f77SDag-Erling Smørgrav 
3072b7579f77SDag-Erling Smørgrav /** process authoritative server reply */
3073b7579f77SDag-Erling Smørgrav static void
3074b7579f77SDag-Erling Smørgrav process_response(struct module_qstate* qstate, struct iter_qstate* iq,
3075b7579f77SDag-Erling Smørgrav 	struct iter_env* ie, int id, struct outbound_entry* outbound,
3076b7579f77SDag-Erling Smørgrav 	enum module_ev event)
3077b7579f77SDag-Erling Smørgrav {
3078b7579f77SDag-Erling Smørgrav 	struct msg_parse* prs;
3079b7579f77SDag-Erling Smørgrav 	struct edns_data edns;
308017d15b25SDag-Erling Smørgrav 	sldns_buffer* pkt;
3081b7579f77SDag-Erling Smørgrav 
3082b7579f77SDag-Erling Smørgrav 	verbose(VERB_ALGO, "process_response: new external response event");
3083b7579f77SDag-Erling Smørgrav 	iq->response = NULL;
3084b7579f77SDag-Erling Smørgrav 	iq->state = QUERY_RESP_STATE;
3085b7579f77SDag-Erling Smørgrav 	if(event == module_event_noreply || event == module_event_error) {
3086ff825849SDag-Erling Smørgrav 		if(event == module_event_noreply && iq->sent_count >= 3 &&
3087ff825849SDag-Erling Smørgrav 			qstate->env->cfg->use_caps_bits_for_id &&
3088ff825849SDag-Erling Smørgrav 			!iq->caps_fallback) {
3089ff825849SDag-Erling Smørgrav 			/* start fallback */
3090ff825849SDag-Erling Smørgrav 			iq->caps_fallback = 1;
3091ff825849SDag-Erling Smørgrav 			iq->caps_server = 0;
3092ff825849SDag-Erling Smørgrav 			iq->caps_reply = NULL;
309309a3aaf3SDag-Erling Smørgrav 			iq->caps_response = NULL;
3094ff825849SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
3095ff825849SDag-Erling Smørgrav 			iq->num_current_queries--;
3096ff825849SDag-Erling Smørgrav 			/* need fresh attempts for the 0x20 fallback, if
3097ff825849SDag-Erling Smørgrav 			 * that was the cause for the failure */
3098ff825849SDag-Erling Smørgrav 			iter_dec_attempts(iq->dp, 3);
3099ff825849SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: timeouts, starting fallback");
3100ff825849SDag-Erling Smørgrav 			goto handle_it;
3101ff825849SDag-Erling Smørgrav 		}
3102b7579f77SDag-Erling Smørgrav 		goto handle_it;
3103b7579f77SDag-Erling Smørgrav 	}
3104b7579f77SDag-Erling Smørgrav 	if( (event != module_event_reply && event != module_event_capsfail)
3105b7579f77SDag-Erling Smørgrav 		|| !qstate->reply) {
3106b7579f77SDag-Erling Smørgrav 		log_err("Bad event combined with response");
3107b7579f77SDag-Erling Smørgrav 		outbound_list_remove(&iq->outlist, outbound);
3108b7579f77SDag-Erling Smørgrav 		(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3109b7579f77SDag-Erling Smørgrav 		return;
3110b7579f77SDag-Erling Smørgrav 	}
3111b7579f77SDag-Erling Smørgrav 
3112b7579f77SDag-Erling Smørgrav 	/* parse message */
3113b7579f77SDag-Erling Smørgrav 	prs = (struct msg_parse*)regional_alloc(qstate->env->scratch,
3114b7579f77SDag-Erling Smørgrav 		sizeof(struct msg_parse));
3115b7579f77SDag-Erling Smørgrav 	if(!prs) {
3116b7579f77SDag-Erling Smørgrav 		log_err("out of memory on incoming message");
3117b7579f77SDag-Erling Smørgrav 		/* like packet got dropped */
3118b7579f77SDag-Erling Smørgrav 		goto handle_it;
3119b7579f77SDag-Erling Smørgrav 	}
3120b7579f77SDag-Erling Smørgrav 	memset(prs, 0, sizeof(*prs));
3121b7579f77SDag-Erling Smørgrav 	memset(&edns, 0, sizeof(edns));
3122b7579f77SDag-Erling Smørgrav 	pkt = qstate->reply->c->buffer;
312317d15b25SDag-Erling Smørgrav 	sldns_buffer_set_position(pkt, 0);
3124b7579f77SDag-Erling Smørgrav 	if(parse_packet(pkt, prs, qstate->env->scratch) != LDNS_RCODE_NOERROR) {
3125b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "parse error on reply packet");
3126b7579f77SDag-Erling Smørgrav 		goto handle_it;
3127b7579f77SDag-Erling Smørgrav 	}
3128b7579f77SDag-Erling Smørgrav 	/* edns is not examined, but removed from message to help cache */
3129*e2d15004SDag-Erling Smørgrav 	if(parse_extract_edns(prs, &edns, qstate->env->scratch) !=
3130*e2d15004SDag-Erling Smørgrav 		LDNS_RCODE_NOERROR)
3131b7579f77SDag-Erling Smørgrav 		goto handle_it;
3132b7579f77SDag-Erling Smørgrav 	/* remove CD-bit, we asked for in case we handle validation ourself */
3133b7579f77SDag-Erling Smørgrav 	prs->flags &= ~BIT_CD;
3134b7579f77SDag-Erling Smørgrav 
3135b7579f77SDag-Erling Smørgrav 	/* normalize and sanitize: easy to delete items from linked lists */
313605ab2901SDag-Erling Smørgrav 	if(!scrub_message(pkt, prs, &iq->qinfo_out, iq->dp->name,
313709a3aaf3SDag-Erling Smørgrav 		qstate->env->scratch, qstate->env, ie)) {
313809a3aaf3SDag-Erling Smørgrav 		/* if 0x20 enabled, start fallback, but we have no message */
313909a3aaf3SDag-Erling Smørgrav 		if(event == module_event_capsfail && !iq->caps_fallback) {
314009a3aaf3SDag-Erling Smørgrav 			iq->caps_fallback = 1;
314109a3aaf3SDag-Erling Smørgrav 			iq->caps_server = 0;
314209a3aaf3SDag-Erling Smørgrav 			iq->caps_reply = NULL;
314309a3aaf3SDag-Erling Smørgrav 			iq->caps_response = NULL;
314409a3aaf3SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
314509a3aaf3SDag-Erling Smørgrav 			iq->num_current_queries--;
314609a3aaf3SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: scrub failed, starting fallback with no response");
314709a3aaf3SDag-Erling Smørgrav 		}
3148b7579f77SDag-Erling Smørgrav 		goto handle_it;
314909a3aaf3SDag-Erling Smørgrav 	}
3150b7579f77SDag-Erling Smørgrav 
3151b7579f77SDag-Erling Smørgrav 	/* allocate response dns_msg in region */
3152b7579f77SDag-Erling Smørgrav 	iq->response = dns_alloc_msg(pkt, prs, qstate->region);
3153b7579f77SDag-Erling Smørgrav 	if(!iq->response)
3154b7579f77SDag-Erling Smørgrav 		goto handle_it;
3155b7579f77SDag-Erling Smørgrav 	log_query_info(VERB_DETAIL, "response for", &qstate->qinfo);
3156b7579f77SDag-Erling Smørgrav 	log_name_addr(VERB_DETAIL, "reply from", iq->dp->name,
3157b7579f77SDag-Erling Smørgrav 		&qstate->reply->addr, qstate->reply->addrlen);
3158b7579f77SDag-Erling Smørgrav 	if(verbosity >= VERB_ALGO)
3159b7579f77SDag-Erling Smørgrav 		log_dns_msg("incoming scrubbed packet:", &iq->response->qinfo,
3160b7579f77SDag-Erling Smørgrav 			iq->response->rep);
3161b7579f77SDag-Erling Smørgrav 
3162ff825849SDag-Erling Smørgrav 	if(event == module_event_capsfail || iq->caps_fallback) {
31636480faa8SDag-Erling Smørgrav 		/* for fallback we care about main answer, not additionals */
31646480faa8SDag-Erling Smørgrav 		/* removing that makes comparison more likely to succeed */
31656480faa8SDag-Erling Smørgrav 		caps_strip_reply(iq->response->rep);
3166b7579f77SDag-Erling Smørgrav 		if(!iq->caps_fallback) {
3167b7579f77SDag-Erling Smørgrav 			/* start fallback */
3168b7579f77SDag-Erling Smørgrav 			iq->caps_fallback = 1;
3169b7579f77SDag-Erling Smørgrav 			iq->caps_server = 0;
3170b7579f77SDag-Erling Smørgrav 			iq->caps_reply = iq->response->rep;
317109a3aaf3SDag-Erling Smørgrav 			iq->caps_response = iq->response;
3172b7579f77SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
3173b7579f77SDag-Erling Smørgrav 			iq->num_current_queries--;
3174b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: starting fallback");
3175b7579f77SDag-Erling Smørgrav 			goto handle_it;
3176b7579f77SDag-Erling Smørgrav 		} else {
3177b7579f77SDag-Erling Smørgrav 			/* check if reply is the same, otherwise, fail */
3178ff825849SDag-Erling Smørgrav 			if(!iq->caps_reply) {
3179ff825849SDag-Erling Smørgrav 				iq->caps_reply = iq->response->rep;
318009a3aaf3SDag-Erling Smørgrav 				iq->caps_response = iq->response;
3181ff825849SDag-Erling Smørgrav 				iq->caps_server = -1; /*become zero at ++,
3182ff825849SDag-Erling Smørgrav 				so that we start the full set of trials */
318309a3aaf3SDag-Erling Smørgrav 			} else if(caps_failed_rcode(iq->caps_reply) &&
318409a3aaf3SDag-Erling Smørgrav 				!caps_failed_rcode(iq->response->rep)) {
318509a3aaf3SDag-Erling Smørgrav 				/* prefer to upgrade to non-SERVFAIL */
318609a3aaf3SDag-Erling Smørgrav 				iq->caps_reply = iq->response->rep;
318709a3aaf3SDag-Erling Smørgrav 				iq->caps_response = iq->response;
318809a3aaf3SDag-Erling Smørgrav 			} else if(!caps_failed_rcode(iq->caps_reply) &&
318909a3aaf3SDag-Erling Smørgrav 				caps_failed_rcode(iq->response->rep)) {
319009a3aaf3SDag-Erling Smørgrav 				/* if we have non-SERVFAIL as answer then
319109a3aaf3SDag-Erling Smørgrav 				 * we can ignore SERVFAILs for the equality
319209a3aaf3SDag-Erling Smørgrav 				 * comparison */
319309a3aaf3SDag-Erling Smørgrav 				/* no instructions here, skip other else */
319409a3aaf3SDag-Erling Smørgrav 			} else if(caps_failed_rcode(iq->caps_reply) &&
319509a3aaf3SDag-Erling Smørgrav 				caps_failed_rcode(iq->response->rep)) {
319609a3aaf3SDag-Erling Smørgrav 				/* failure is same as other failure in fallbk*/
319709a3aaf3SDag-Erling Smørgrav 				/* no instructions here, skip other else */
3198ff825849SDag-Erling Smørgrav 			} else if(!reply_equal(iq->response->rep, iq->caps_reply,
319917d15b25SDag-Erling Smørgrav 				qstate->env->scratch)) {
3200b7579f77SDag-Erling Smørgrav 				verbose(VERB_DETAIL, "Capsforid fallback: "
3201b7579f77SDag-Erling Smørgrav 					"getting different replies, failed");
3202b7579f77SDag-Erling Smørgrav 				outbound_list_remove(&iq->outlist, outbound);
3203b7579f77SDag-Erling Smørgrav 				(void)error_response(qstate, id,
3204b7579f77SDag-Erling Smørgrav 					LDNS_RCODE_SERVFAIL);
3205b7579f77SDag-Erling Smørgrav 				return;
3206b7579f77SDag-Erling Smørgrav 			}
3207b7579f77SDag-Erling Smørgrav 			/* continue the fallback procedure at next server */
3208b7579f77SDag-Erling Smørgrav 			iq->caps_server++;
3209b7579f77SDag-Erling Smørgrav 			iq->state = QUERYTARGETS_STATE;
3210b7579f77SDag-Erling Smørgrav 			iq->num_current_queries--;
3211b7579f77SDag-Erling Smørgrav 			verbose(VERB_DETAIL, "Capsforid: reply is equal. "
3212b7579f77SDag-Erling Smørgrav 				"go to next fallback");
3213b7579f77SDag-Erling Smørgrav 			goto handle_it;
3214b7579f77SDag-Erling Smørgrav 		}
3215b7579f77SDag-Erling Smørgrav 	}
3216b7579f77SDag-Erling Smørgrav 	iq->caps_fallback = 0; /* if we were in fallback, 0x20 is OK now */
3217b7579f77SDag-Erling Smørgrav 
3218b7579f77SDag-Erling Smørgrav handle_it:
3219b7579f77SDag-Erling Smørgrav 	outbound_list_remove(&iq->outlist, outbound);
3220b7579f77SDag-Erling Smørgrav 	iter_handle(qstate, iq, ie, id);
3221b7579f77SDag-Erling Smørgrav }
3222b7579f77SDag-Erling Smørgrav 
3223b7579f77SDag-Erling Smørgrav void
3224b7579f77SDag-Erling Smørgrav iter_operate(struct module_qstate* qstate, enum module_ev event, int id,
3225b7579f77SDag-Erling Smørgrav 	struct outbound_entry* outbound)
3226b7579f77SDag-Erling Smørgrav {
3227b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)qstate->env->modinfo[id];
3228b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq = (struct iter_qstate*)qstate->minfo[id];
3229b7579f77SDag-Erling Smørgrav 	verbose(VERB_QUERY, "iterator[module %d] operate: extstate:%s event:%s",
3230b7579f77SDag-Erling Smørgrav 		id, strextstate(qstate->ext_state[id]), strmodulevent(event));
3231b7579f77SDag-Erling Smørgrav 	if(iq) log_query_info(VERB_QUERY, "iterator operate: query",
3232b7579f77SDag-Erling Smørgrav 		&qstate->qinfo);
3233b7579f77SDag-Erling Smørgrav 	if(iq && qstate->qinfo.qname != iq->qchase.qname)
3234b7579f77SDag-Erling Smørgrav 		log_query_info(VERB_QUERY, "iterator operate: chased to",
3235b7579f77SDag-Erling Smørgrav 			&iq->qchase);
3236b7579f77SDag-Erling Smørgrav 
3237b7579f77SDag-Erling Smørgrav 	/* perform iterator state machine */
3238b7579f77SDag-Erling Smørgrav 	if((event == module_event_new || event == module_event_pass) &&
3239b7579f77SDag-Erling Smørgrav 		iq == NULL) {
3240b7579f77SDag-Erling Smørgrav 		if(!iter_new(qstate, id)) {
3241b7579f77SDag-Erling Smørgrav 			(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3242b7579f77SDag-Erling Smørgrav 			return;
3243b7579f77SDag-Erling Smørgrav 		}
3244b7579f77SDag-Erling Smørgrav 		iq = (struct iter_qstate*)qstate->minfo[id];
3245b7579f77SDag-Erling Smørgrav 		process_request(qstate, iq, ie, id);
3246b7579f77SDag-Erling Smørgrav 		return;
3247b7579f77SDag-Erling Smørgrav 	}
3248b7579f77SDag-Erling Smørgrav 	if(iq && event == module_event_pass) {
3249b7579f77SDag-Erling Smørgrav 		iter_handle(qstate, iq, ie, id);
3250b7579f77SDag-Erling Smørgrav 		return;
3251b7579f77SDag-Erling Smørgrav 	}
3252b7579f77SDag-Erling Smørgrav 	if(iq && outbound) {
3253b7579f77SDag-Erling Smørgrav 		process_response(qstate, iq, ie, id, outbound, event);
3254b7579f77SDag-Erling Smørgrav 		return;
3255b7579f77SDag-Erling Smørgrav 	}
3256b7579f77SDag-Erling Smørgrav 	if(event == module_event_error) {
3257b7579f77SDag-Erling Smørgrav 		verbose(VERB_ALGO, "got called with event error, giving up");
3258b7579f77SDag-Erling Smørgrav 		(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3259b7579f77SDag-Erling Smørgrav 		return;
3260b7579f77SDag-Erling Smørgrav 	}
3261b7579f77SDag-Erling Smørgrav 
3262b7579f77SDag-Erling Smørgrav 	log_err("bad event for iterator");
3263b7579f77SDag-Erling Smørgrav 	(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
3264b7579f77SDag-Erling Smørgrav }
3265b7579f77SDag-Erling Smørgrav 
3266b7579f77SDag-Erling Smørgrav void
3267b7579f77SDag-Erling Smørgrav iter_clear(struct module_qstate* qstate, int id)
3268b7579f77SDag-Erling Smørgrav {
3269b7579f77SDag-Erling Smørgrav 	struct iter_qstate* iq;
3270b7579f77SDag-Erling Smørgrav 	if(!qstate)
3271b7579f77SDag-Erling Smørgrav 		return;
3272b7579f77SDag-Erling Smørgrav 	iq = (struct iter_qstate*)qstate->minfo[id];
3273b7579f77SDag-Erling Smørgrav 	if(iq) {
3274b7579f77SDag-Erling Smørgrav 		outbound_list_clear(&iq->outlist);
327552df462fSXin LI 		if(iq->target_count && --iq->target_count[0] == 0)
327652df462fSXin LI 			free(iq->target_count);
3277b7579f77SDag-Erling Smørgrav 		iq->num_current_queries = 0;
3278b7579f77SDag-Erling Smørgrav 	}
3279b7579f77SDag-Erling Smørgrav 	qstate->minfo[id] = NULL;
3280b7579f77SDag-Erling Smørgrav }
3281b7579f77SDag-Erling Smørgrav 
3282b7579f77SDag-Erling Smørgrav size_t
3283b7579f77SDag-Erling Smørgrav iter_get_mem(struct module_env* env, int id)
3284b7579f77SDag-Erling Smørgrav {
3285b7579f77SDag-Erling Smørgrav 	struct iter_env* ie = (struct iter_env*)env->modinfo[id];
3286b7579f77SDag-Erling Smørgrav 	if(!ie)
3287b7579f77SDag-Erling Smørgrav 		return 0;
3288b7579f77SDag-Erling Smørgrav 	return sizeof(*ie) + sizeof(int)*((size_t)ie->max_dependency_depth+1)
3289b7579f77SDag-Erling Smørgrav 		+ donotq_get_mem(ie->donotq) + priv_get_mem(ie->priv);
3290b7579f77SDag-Erling Smørgrav }
3291b7579f77SDag-Erling Smørgrav 
3292b7579f77SDag-Erling Smørgrav /**
3293b7579f77SDag-Erling Smørgrav  * The iterator function block
3294b7579f77SDag-Erling Smørgrav  */
3295b7579f77SDag-Erling Smørgrav static struct module_func_block iter_block = {
3296b7579f77SDag-Erling Smørgrav 	"iterator",
3297b7579f77SDag-Erling Smørgrav 	&iter_init, &iter_deinit, &iter_operate, &iter_inform_super,
3298b7579f77SDag-Erling Smørgrav 	&iter_clear, &iter_get_mem
3299b7579f77SDag-Erling Smørgrav };
3300b7579f77SDag-Erling Smørgrav 
3301b7579f77SDag-Erling Smørgrav struct module_func_block*
3302b7579f77SDag-Erling Smørgrav iter_get_funcblock(void)
3303b7579f77SDag-Erling Smørgrav {
3304b7579f77SDag-Erling Smørgrav 	return &iter_block;
3305b7579f77SDag-Erling Smørgrav }
3306b7579f77SDag-Erling Smørgrav 
3307b7579f77SDag-Erling Smørgrav const char*
3308b7579f77SDag-Erling Smørgrav iter_state_to_string(enum iter_state state)
3309b7579f77SDag-Erling Smørgrav {
3310b7579f77SDag-Erling Smørgrav 	switch (state)
3311b7579f77SDag-Erling Smørgrav 	{
3312b7579f77SDag-Erling Smørgrav 	case INIT_REQUEST_STATE :
3313b7579f77SDag-Erling Smørgrav 		return "INIT REQUEST STATE";
3314b7579f77SDag-Erling Smørgrav 	case INIT_REQUEST_2_STATE :
3315b7579f77SDag-Erling Smørgrav 		return "INIT REQUEST STATE (stage 2)";
3316b7579f77SDag-Erling Smørgrav 	case INIT_REQUEST_3_STATE:
3317b7579f77SDag-Erling Smørgrav 		return "INIT REQUEST STATE (stage 3)";
3318b7579f77SDag-Erling Smørgrav 	case QUERYTARGETS_STATE :
3319b7579f77SDag-Erling Smørgrav 		return "QUERY TARGETS STATE";
3320b7579f77SDag-Erling Smørgrav 	case PRIME_RESP_STATE :
3321b7579f77SDag-Erling Smørgrav 		return "PRIME RESPONSE STATE";
3322b7579f77SDag-Erling Smørgrav 	case COLLECT_CLASS_STATE :
3323b7579f77SDag-Erling Smørgrav 		return "COLLECT CLASS STATE";
3324b7579f77SDag-Erling Smørgrav 	case DSNS_FIND_STATE :
3325b7579f77SDag-Erling Smørgrav 		return "DSNS FIND STATE";
3326b7579f77SDag-Erling Smørgrav 	case QUERY_RESP_STATE :
3327b7579f77SDag-Erling Smørgrav 		return "QUERY RESPONSE STATE";
3328b7579f77SDag-Erling Smørgrav 	case FINISHED_STATE :
3329b7579f77SDag-Erling Smørgrav 		return "FINISHED RESPONSE STATE";
3330b7579f77SDag-Erling Smørgrav 	default :
3331b7579f77SDag-Erling Smørgrav 		return "UNKNOWN ITER STATE";
3332b7579f77SDag-Erling Smørgrav 	}
3333b7579f77SDag-Erling Smørgrav }
3334b7579f77SDag-Erling Smørgrav 
3335b7579f77SDag-Erling Smørgrav int
3336b7579f77SDag-Erling Smørgrav iter_state_is_responsestate(enum iter_state s)
3337b7579f77SDag-Erling Smørgrav {
3338b7579f77SDag-Erling Smørgrav 	switch(s) {
3339b7579f77SDag-Erling Smørgrav 		case INIT_REQUEST_STATE :
3340b7579f77SDag-Erling Smørgrav 		case INIT_REQUEST_2_STATE :
3341b7579f77SDag-Erling Smørgrav 		case INIT_REQUEST_3_STATE :
3342b7579f77SDag-Erling Smørgrav 		case QUERYTARGETS_STATE :
3343b7579f77SDag-Erling Smørgrav 		case COLLECT_CLASS_STATE :
3344b7579f77SDag-Erling Smørgrav 			return 0;
3345b7579f77SDag-Erling Smørgrav 		default:
3346b7579f77SDag-Erling Smørgrav 			break;
3347b7579f77SDag-Erling Smørgrav 	}
3348b7579f77SDag-Erling Smørgrav 	return 1;
3349b7579f77SDag-Erling Smørgrav }
3350