diff options
Diffstat (limited to 'bin/named/notify.c')
| -rw-r--r-- | bin/named/notify.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/bin/named/notify.c b/bin/named/notify.c new file mode 100644 index 0000000..de52b8c --- /dev/null +++ b/bin/named/notify.c @@ -0,0 +1,174 @@ +/* + * 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); +} |