149 lines
4.0 KiB
C
149 lines
4.0 KiB
C
/*
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* Copyright (C) 1999-2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: notify.c,v 1.26 2001/12/10 23:09:23 marka Exp $ */
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#include <config.h>
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#include <isc/log.h>
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#include <dns/message.h>
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#include <dns/rdataset.h>
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#include <dns/result.h>
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#include <dns/view.h>
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#include <dns/zone.h>
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#include <dns/zt.h>
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#include <named/log.h>
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#include <named/notify.h>
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/*
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* This module implements notify as in RFC 1996.
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*/
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static void
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notify_log(ns_client_t *client, int level, const char *fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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ns_client_logv(client, DNS_LOGCATEGORY_NOTIFY, NS_LOGMODULE_NOTIFY,
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level, fmt, ap);
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va_end(ap);
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}
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static void
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respond(ns_client_t *client, isc_result_t result) {
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dns_rcode_t rcode;
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dns_message_t *message;
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isc_result_t msg_result;
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message = client->message;
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rcode = dns_result_torcode(result);
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msg_result = dns_message_reply(message, ISC_TRUE);
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if (msg_result != ISC_R_SUCCESS)
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msg_result = dns_message_reply(message, ISC_FALSE);
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if (msg_result != ISC_R_SUCCESS) {
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ns_client_next(client, msg_result);
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return;
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}
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message->rcode = rcode;
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if (rcode == dns_rcode_noerror)
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message->flags |= DNS_MESSAGEFLAG_AA;
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else
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message->flags &= ~DNS_MESSAGEFLAG_AA;
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ns_client_send(client);
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}
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void
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ns_notify_start(ns_client_t *client) {
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dns_message_t *request = client->message;
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isc_result_t result;
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dns_name_t *zonename;
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dns_rdataset_t *zone_rdataset;
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dns_zone_t *zone = NULL;
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char str[DNS_NAME_FORMATSIZE];
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/*
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* Interpret the question section.
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*/
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result = dns_message_firstname(request, DNS_SECTION_QUESTION);
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if (result != ISC_R_SUCCESS) {
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notify_log(client, ISC_LOG_INFO, "notify question section empty");
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goto failure;
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}
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/*
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* The question section must contain exactly one question.
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*/
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zonename = NULL;
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dns_message_currentname(request, DNS_SECTION_QUESTION, &zonename);
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zone_rdataset = ISC_LIST_HEAD(zonename->list);
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if (ISC_LIST_NEXT(zone_rdataset, link) != NULL) {
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notify_log(client, ISC_LOG_INFO,
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"notify question section contains multiple RRs");
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goto failure;
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}
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/* The zone section must have exactly one name. */
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result = dns_message_nextname(request, DNS_SECTION_ZONE);
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if (result != ISC_R_NOMORE) {
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notify_log(client, ISC_LOG_INFO,
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"notify question section contains multiple RRs");
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goto failure;
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}
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/* The one rdataset must be an SOA. */
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if (zone_rdataset->type != dns_rdatatype_soa) {
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notify_log(client, ISC_LOG_INFO,
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"notify question section contains no SOA");
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goto failure;
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}
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result = dns_zt_find(client->view->zonetable, zonename, 0, NULL,
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&zone);
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if (result != ISC_R_SUCCESS) {
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dns_name_format(zonename, str, sizeof(str));
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notify_log(client, ISC_LOG_INFO,
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"received notify for zone '%s': not authoritative",
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str);
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goto failure;
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}
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switch (dns_zone_gettype(zone)) {
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case dns_zone_master:
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case dns_zone_slave:
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case dns_zone_stub: /* Allow dialup passive to work. */
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respond(client, dns_zone_notifyreceive(zone,
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ns_client_getsockaddr(client), request));
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break;
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default:
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dns_name_format(zonename, str, sizeof(str));
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notify_log(client, ISC_LOG_INFO,
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"received notify for zone '%s': not authoritative",
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str);
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goto failure;
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}
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dns_zone_detach(&zone);
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return;
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failure:
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if (zone != NULL)
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dns_zone_detach(&zone);
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respond(client, result);
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}
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