notify.c revision 40f53fa8d9c6a4fc38c0014495e7a42b08f52481
/*
* Copyright (C) 1999, 2000 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 INTERNET SOFTWARE CONSORTIUM
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* INTERNET SOFTWARE CONSORTIUM 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 1.20 2000/08/01 01:11:54 tale Exp $ */
#include <config.h>
#include <dns/message.h>
#include <dns/rdataset.h>
#include <dns/result.h>
#include <dns/view.h>
#include <dns/zone.h>
#include <dns/zt.h>
#include <named/log.h>
#include <named/notify.h>
/*
* This module implements notify as in RFC 1996.
*/
/**************************************************************************/
/*
* Convenience macro of common isc_log_write() arguments
* to use in reportings server errors.
*/
#define NOTIFY_ERROR_LOGARGS \
ns_g_lctx, DNS_LOGCATEGORY_NOTIFY, NS_LOGMODULE_NOTIFY, \
ISC_LOG_ERROR
/*
* Convenience macro of common isc_log_write() arguments
* to use in tracing notify protocol requests.
*/
#define NOTIFY_PROTOCOL_LOGARGS \
ns_g_lctx, DNS_LOGCATEGORY_NOTIFY, NS_LOGMODULE_NOTIFY, \
ISC_LOG_INFO
/*
* Convenience macro of common isc_log_write() arguments
* to use in low-level debug tracing.
*/
#define NOTIFY_DEBUG_LOGARGS \
ns_g_lctx, DNS_LOGCATEGORY_NOTIFY, NS_LOGMODULE_NOTIFY, \
ISC_LOG_DEBUG(8)
/*
* Check an operation for failure. These macros all assume that
* the function using them has a 'result' variable and a 'failure'
* label.
*/
#define CHECK(op) \
do { result = (op); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
/*
* Fail unconditionally with result 'code', which must not
* be ISC_R_SUCCESS. The reason for failure presumably has
* been logged already.
*
* The test is there to keep the Solaris compiler from complaining
* about "end-of-loop code not reached".
*/
#define FAIL(code) \
do { \
result = (code); \
if (code != ISC_R_SUCCESS) goto failure; \
} while (0)
/*
* Fail unconditionally and log as a client error.
* The test against ISC_R_SUCCESS is there to keep the Solaris compiler
* from complaining about "end-of-loop code not reached".
*/
#define FAILC(code, msg) \
do { \
result = (code); \
isc_log_write(NOTIFY_PROTOCOL_LOGARGS, \
"notify failed: %s (%s)", \
msg, isc_result_totext(code)); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
/*
* Fail unconditionally and log as a server error.
* The test against ISC_R_SUCCESS is there to keep the Solaris compiler
* from complaining about "end-of-loop code not reached".
*/
#define FAILS(code, msg) \
do { \
result = (code); \
isc_log_write(NOTIFY_PROTOCOL_LOGARGS, \
"notify error: %s: %s", \
msg, isc_result_totext(code)); \
if (result != ISC_R_SUCCESS) goto failure; \
} while (0)
/**************************************************************************/
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;
/*
* Interpret the question section.
*/
result = dns_message_firstname(request, DNS_SECTION_QUESTION);
if (result != ISC_R_SUCCESS)
FAILC(DNS_R_FORMERR,
"notify question section empty");
/*
* 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)
FAILC(DNS_R_FORMERR,
"notify question section contains multiple RRs");
/* The zone section must have exactly one name. */
result = dns_message_nextname(request, DNS_SECTION_ZONE);
if (result != ISC_R_NOMORE)
FAILC(DNS_R_FORMERR,
"notify question section contains multiple RRs");
result = dns_zt_find(client->view->zonetable, zonename, 0, NULL,
&zone);
if (result != ISC_R_SUCCESS)
FAILC(DNS_R_REFUSED,
"not authoritative for notify zone");
switch(dns_zone_gettype(zone)) {
case dns_zone_master:
case dns_zone_slave:
respond(client, dns_zone_notifyreceive(zone,
ns_client_getsockaddr(client), request));
break;
default:
FAILC(DNS_R_REFUSED,
"not authoritative for notify zone");
}
dns_zone_detach(&zone);
return;
failure:
if (zone != NULL)
dns_zone_detach(&zone);
respond(client, result);
}