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/*
* Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2003 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or 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 1.37 2007/06/19 23:46:59 tbox Exp $ */
#include <config.h>
#include <isc/log.h>
#include <isc/print.h>
#include <dns/message.h>
#include <dns/rdataset.h>
#include <dns/result.h>
#include <dns/tsig.h>
#include <dns/view.h>
#include <dns/zone.h>
#include <dns/zt.h>
#include <named/log.h>
#include <named/notify.h>
/*! \file
* \brief
* This module implements notify as in RFC1996.
*/
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_tsigkey_t *tsigkey;
/*
* 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;
}
tsigkey = dns_message_gettsigkey(request);
if (tsigkey != NULL) {
dns_name_format(&tsigkey->name, namebuf, sizeof(namebuf));
if (tsigkey->generated) {
char cnamebuf[DNS_NAME_FORMATSIZE];
dns_name_format(tsigkey->creator, cnamebuf,
sizeof(cnamebuf));
snprintf(tsigbuf, sizeof(tsigbuf), ": TSIG '%s' (%s)",
namebuf, cnamebuf);
} else {
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);
}
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