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