contrib/bind-9.2.4rc7/bin/named/notify.c

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1999-2001, 2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: notify.c,v 1.24.2.3 2004/03/09 06:09:19 marka Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <isc/log.h>
  23
  24 #include <dns/message.h>
  25 #include <dns/rdataset.h>
  26 #include <dns/result.h>
  27 #include <dns/view.h>
  28 #include <dns/zone.h>
  29 #include <dns/zt.h>
  30
  31 #include <named/log.h>
  32 #include <named/notify.h>
  33
  34 /*
  35  * This module implements notify as in RFC 1996.
  36  */
  37
  38 static void
  39 notify_log(int level, const char *fmt, ...) {
  40         va_list ap;
  41
  42         va_start(ap, fmt);
  43         isc_log_vwrite(ns_g_lctx, DNS_LOGCATEGORY_NOTIFY, NS_LOGMODULE_NOTIFY,
  44                        level, fmt, ap);
  45         va_end(ap);
  46 }
  47
  48 static void
  49 respond(ns_client_t *client, isc_result_t result) {
  50         dns_rcode_t rcode;
  51         dns_message_t *message;
  52         isc_result_t msg_result;
  53
  54         message = client->message;
  55         rcode = dns_result_torcode(result);
  56
  57         msg_result = dns_message_reply(message, ISC_TRUE);
  58         if (msg_result != ISC_R_SUCCESS)
  59                 msg_result = dns_message_reply(message, ISC_FALSE);
  60         if (msg_result != ISC_R_SUCCESS) {
  61                 ns_client_next(client, msg_result);
  62                 return;
  63         }
  64         message->rcode = rcode;
  65         if (rcode == dns_rcode_noerror)
  66                 message->flags |= DNS_MESSAGEFLAG_AA;
  67         else
  68                 message->flags &= ~DNS_MESSAGEFLAG_AA;
  69         ns_client_send(client);
  70 }
  71
  72 void
  73 ns_notify_start(ns_client_t *client) {
  74         dns_message_t *request = client->message;
  75         isc_result_t result;
  76         dns_name_t *zonename;
  77         dns_rdataset_t *zone_rdataset;
  78         dns_zone_t *zone = NULL;
  79         char str[DNS_NAME_FORMATSIZE];
  80
  81         /*
  82          * Interpret the question section.
  83          */
  84         result = dns_message_firstname(request, DNS_SECTION_QUESTION);
  85         if (result != ISC_R_SUCCESS) {
  86                 notify_log(ISC_LOG_INFO, "notify question section empty");
  87                 goto formerr;
  88         }
  89
  90         /*
  91          * The question section must contain exactly one question.
  92          */
  93         zonename = NULL;
  94         dns_message_currentname(request, DNS_SECTION_QUESTION, &zonename);
  95         zone_rdataset = ISC_LIST_HEAD(zonename->list);
  96         if (ISC_LIST_NEXT(zone_rdataset, link) != NULL) {
  97                 notify_log(ISC_LOG_INFO,
  98                            "notify question section contains multiple RRs");
  99                 goto formerr;
 100         }
 101
 102         /* The zone section must have exactly one name. */
 103         result = dns_message_nextname(request, DNS_SECTION_ZONE);
 104         if (result != ISC_R_NOMORE) {
 105                 notify_log(ISC_LOG_INFO,
 106                            "notify question section contains multiple RRs");
 107                 goto failure;
 108         }
 109
 110         /* The one rdataset must be an SOA. */
 111         if (zone_rdataset->type != dns_rdatatype_soa) {
 112                 notify_log(ISC_LOG_INFO,
 113                            "notify question section contains no SOA");
 114                 goto formerr;
 115         }
 116
 117         dns_name_format(zonename, str, sizeof(str));
 118         result = dns_zt_find(client->view->zonetable, zonename, 0, NULL,
 119                              &zone);
 120         if (result != ISC_R_SUCCESS)
 121                 goto notauth;
 122
 123         switch(dns_zone_gettype(zone)) {
 124         case dns_zone_master:
 125         case dns_zone_slave:
 126         case dns_zone_stub:     /* Allow dialup passive to work. */
 127                 notify_log(ISC_LOG_INFO, "received notify for zone '%s'", str);
 128                 respond(client, dns_zone_notifyreceive(zone,
 129                         ns_client_getsockaddr(client), request));
 130                 break;
 131         default:
 132                 goto notauth;
 133         }
 134         dns_zone_detach(&zone);
 135         return;
 136
 137  notauth:
 138         notify_log(ISC_LOG_INFO,
 139                    "received notify for zone '%s': not authoritative",
 140                    str);
 141         result = DNS_R_NOTAUTH;
 142         goto failure;
 143
 144  formerr:
 145         result = DNS_R_FORMERR;
 146
 147  failure:
 148         if (zone != NULL)
 149                 dns_zone_detach(&zone);
 150         respond(client, result);
 151 }