/* * Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC") * Copyright (C) 1999-2003 Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ /* $Id: notify.c,v 1.24.2.2.2.7 2004/08/28 06:25:30 marka Exp $ */ #include #include #include #include #include #include #include #include #include #include #include /* * This module implements notify as in RFC 1996. */ static void notify_log(ns_client_t *client, int level, const char *fmt, ...) { va_list ap; va_start(ap, fmt); ns_client_logv(client, DNS_LOGCATEGORY_NOTIFY, NS_LOGMODULE_NOTIFY, level, fmt, ap); va_end(ap); } static void respond(ns_client_t *client, isc_result_t result) { dns_rcode_t rcode; dns_message_t *message; isc_result_t msg_result; message = client->message; rcode = dns_result_torcode(result); msg_result = dns_message_reply(message, ISC_TRUE); if (msg_result != ISC_R_SUCCESS) msg_result = dns_message_reply(message, ISC_FALSE); if (msg_result != ISC_R_SUCCESS) { ns_client_next(client, msg_result); return; } message->rcode = rcode; if (rcode == dns_rcode_noerror) message->flags |= DNS_MESSAGEFLAG_AA; else message->flags &= ~DNS_MESSAGEFLAG_AA; ns_client_send(client); } void ns_notify_start(ns_client_t *client) { dns_message_t *request = client->message; isc_result_t result; dns_name_t *zonename; dns_rdataset_t *zone_rdataset; dns_zone_t *zone = NULL; char namebuf[DNS_NAME_FORMATSIZE]; char tsigbuf[DNS_NAME_FORMATSIZE + sizeof(": TSIG ''")]; dns_name_t *tsigname; /* * Interpret the question section. */ result = dns_message_firstname(request, DNS_SECTION_QUESTION); if (result != ISC_R_SUCCESS) { notify_log(client, ISC_LOG_NOTICE, "notify question section empty"); goto formerr; } /* * The question section must contain exactly one question. */ zonename = NULL; dns_message_currentname(request, DNS_SECTION_QUESTION, &zonename); zone_rdataset = ISC_LIST_HEAD(zonename->list); if (ISC_LIST_NEXT(zone_rdataset, link) != NULL) { notify_log(client, ISC_LOG_NOTICE, "notify question section contains multiple RRs"); goto formerr; } /* The zone section must have exactly one name. */ result = dns_message_nextname(request, DNS_SECTION_ZONE); if (result != ISC_R_NOMORE) { notify_log(client, ISC_LOG_NOTICE, "notify question section contains multiple RRs"); goto formerr; } /* The one rdataset must be an SOA. */ if (zone_rdataset->type != dns_rdatatype_soa) { notify_log(client, ISC_LOG_NOTICE, "notify question section contains no SOA"); goto formerr; } tsigname = NULL; if (dns_message_gettsig(request, &tsigname) != NULL) { dns_name_format(tsigname, namebuf, sizeof(namebuf)); snprintf(tsigbuf, sizeof(tsigbuf), ": TSIG '%s'", namebuf); } else tsigbuf[0] = '\0'; dns_name_format(zonename, namebuf, sizeof(namebuf)); result = dns_zt_find(client->view->zonetable, zonename, 0, NULL, &zone); if (result != ISC_R_SUCCESS) goto notauth; switch (dns_zone_gettype(zone)) { case dns_zone_master: case dns_zone_slave: case dns_zone_stub: /* Allow dialup passive to work. */ notify_log(client, ISC_LOG_INFO, "received notify for zone '%s'%s", namebuf, tsigbuf); respond(client, dns_zone_notifyreceive(zone, ns_client_getsockaddr(client), request)); break; default: goto notauth; } dns_zone_detach(&zone); return; notauth: notify_log(client, ISC_LOG_NOTICE, "received notify for zone '%s'%s: not authoritative", namebuf, tsigbuf); result = DNS_R_NOTAUTH; goto failure; formerr: result = DNS_R_FORMERR; failure: if (zone != NULL) dns_zone_detach(&zone); respond(client, result); }