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query.h
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/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef NS_QUERY_H #define NS_QUERY_H 1 /*! \file */ #include <stdbool.h> #include <isc/buffer.h> #include <isc/netaddr.h> #include <isc/types.h> #include <dns/rdataset.h> #include <dns/resolver.h> #include <dns/rpz.h> #include <dns/types.h> #include <ns/types.h> /*% nameserver database version structure */ typedef struct ns_dbversion { dns_db_t *db; dns_dbversion_t *version; bool acl_checked; bool queryok; ISC_LINK(struct ns_dbversion) link; } ns_dbversion_t; /*% * nameserver recursion parameters, to uniquely identify a recursion * query; this is used to detect a recursion loop */ typedef struct ns_query_recparam { dns_rdatatype_t qtype; dns_name_t *qname; dns_fixedname_t fqname; dns_name_t *qdomain; dns_fixedname_t fqdomain; } ns_query_recparam_t; /*% nameserver query structure */ struct ns_query { unsigned int attributes; unsigned int restarts; bool timerset; dns_name_t *qname; dns_name_t *origqname; dns_rdatatype_t qtype; unsigned int dboptions; unsigned int fetchoptions; dns_db_t *gluedb; dns_db_t *authdb; dns_zone_t *authzone; bool authdbset; bool isreferral; isc_mutex_t fetchlock; dns_fetch_t *fetch; dns_fetch_t *prefetch; dns_rpz_st_t *rpz_st; isc_bufferlist_t namebufs; ISC_LIST(ns_dbversion_t) activeversions; ISC_LIST(ns_dbversion_t) freeversions; dns_rdataset_t *dns64_aaaa; dns_rdataset_t *dns64_sigaaaa; bool *dns64_aaaaok; unsigned int dns64_aaaaoklen; unsigned int dns64_options; unsigned int dns64_ttl; struct { dns_db_t *db; dns_zone_t *zone; dns_dbnode_t *node; dns_rdatatype_t qtype; dns_name_t *fname; dns_fixedname_t fixed; isc_result_t result; dns_rdataset_t *rdataset; dns_rdataset_t *sigrdataset; bool authoritative; bool is_zone; } redirect; ns_query_recparam_t recparam; dns_keytag_t root_key_sentinel_keyid; bool root_key_sentinel_is_ta; bool root_key_sentinel_not_ta; }; #define NS_QUERYATTR_RECURSIONOK 0x000001 #define NS_QUERYATTR_CACHEOK 0x000002 #define NS_QUERYATTR_PARTIALANSWER 0x000004 #define NS_QUERYATTR_NAMEBUFUSED 0x000008 #define NS_QUERYATTR_RECURSING 0x000010 #define NS_QUERYATTR_QUERYOKVALID 0x000040 #define NS_QUERYATTR_QUERYOK 0x000080 #define NS_QUERYATTR_WANTRECURSION 0x000100 #define NS_QUERYATTR_SECURE 0x000200 #define NS_QUERYATTR_NOAUTHORITY 0x000400 #define NS_QUERYATTR_NOADDITIONAL 0x000800 #define NS_QUERYATTR_CACHEACLOKVALID 0x001000 #define NS_QUERYATTR_CACHEACLOK 0x002000 #define NS_QUERYATTR_DNS64 0x004000 #define NS_QUERYATTR_DNS64EXCLUDE 0x008000 #define NS_QUERYATTR_RRL_CHECKED 0x010000 #define NS_QUERYATTR_REDIRECT 0x020000 #define NS_QUERYATTR_ANSWERED 0x040000 #define NS_QUERYATTR_STALEOK 0x080000 #define NS_QUERYATTR_STALEPENDING 0x100000 typedef struct query_ctx query_ctx_t; /* query context structure */ struct query_ctx { isc_buffer_t *dbuf; /* name buffer */ dns_name_t *fname; /* found name from DB lookup */ dns_name_t *tname; /* temporary name, used * when processing ANY * queries */ dns_rdataset_t *rdataset; /* found rdataset */ dns_rdataset_t *sigrdataset; /* found sigrdataset */ dns_rdataset_t *noqname; /* rdataset needing * NOQNAME proof */ dns_rdatatype_t qtype; dns_rdatatype_t type; unsigned int options; /* DB lookup options */ bool redirected; /* nxdomain redirected? */ bool is_zone; /* is DB a zone DB? */ bool is_staticstub_zone; bool resuming; /* resumed from recursion? */ bool dns64, dns64_exclude, rpz; bool authoritative; /* authoritative query? */ bool want_restart; /* CNAME chain or other * restart needed */ bool refresh_rrset; /* stale RRset refresh needed */ bool need_wildcardproof; /* wildcard proof needed */ bool nxrewrite; /* negative answer from RPZ */ bool findcoveringnsec; /* lookup covering NSEC */ bool answer_has_ns; /* NS is in answer */ dns_fixedname_t wildcardname; /* name needing wcard proof */ dns_fixedname_t dsname; /* name needing DS */ ns_client_t *client; /* client object */ bool detach_client; /* client needs detaching */ dns_fetchevent_t *event; /* recursion event */ dns_db_t *db; /* zone or cache database */ dns_dbversion_t *version; /* DB version */ dns_dbnode_t *node; /* DB node */ dns_db_t *zdb; /* zone DB values, saved */ dns_dbnode_t *znode; /* while searching cache */ dns_name_t *zfname; /* for a better answer */ dns_dbversion_t *zversion; dns_rdataset_t *zrdataset; dns_rdataset_t *zsigrdataset; dns_rpz_st_t *rpz_st; /* RPZ state */ dns_zone_t *zone; /* zone to search */ dns_view_t *view; /* client view */ isc_result_t result; /* query result */ int line; /* line to report error */ }; isc_result_t ns_query_done(query_ctx_t *qctx); /*%< * Finalize this phase of the query process: * * - Clean up. * - If we have an answer ready (positive or negative), send it. * - If we need to restart for a chaining query, call ns__query_start() again. * - If we've started recursion, then just clean up; things will be * restarted via fetch_callback()/query_resume(). */ isc_result_t ns_query_recurse(ns_client_t *client, dns_rdatatype_t qtype, dns_name_t *qname, dns_name_t *qdomain, dns_rdataset_t *nameservers, bool resuming); /*%< * Prepare client for recursion, then create a resolver fetch, with * the event callback set to fetch_callback(). Afterward we terminate * this phase of the query, and resume with a new query context when * recursion completes. */ isc_result_t ns_query_init(ns_client_t *client); void ns_query_free(ns_client_t *client); void ns_query_start(ns_client_t *client, isc_nmhandle_t *handle); void ns_query_cancel(ns_client_t *client); /* * The following functions are expected to be used only within query.c * and query modules. */ isc_result_t ns__query_sfcache(query_ctx_t *qctx); /*%< * (Must not be used outside this module and its associated unit tests.) */ isc_result_t ns__query_start(query_ctx_t *qctx); /*%< * (Must not be used outside this module and its associated unit tests.) */ #endif /* NS_QUERY_H */