/* $NetBSD: notify.c,v 1.3.4.1 2024/02/29 12:35:29 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #include #include #include #include #include #include #include #include #include #include #include #include #include /*! \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, true); if (msg_result != ISC_R_SUCCESS) { msg_result = dns_message_reply(message, false); } if (msg_result != ISC_R_SUCCESS) { ns_client_drop(client, msg_result); isc_nmhandle_detach(&client->reqhandle); return; } message->rcode = rcode; if (rcode == dns_rcode_noerror) { message->flags |= DNS_MESSAGEFLAG_AA; } else { message->flags &= ~DNS_MESSAGEFLAG_AA; } ns_client_send(client); isc_nmhandle_detach(&client->reqhandle); } void ns_notify_start(ns_client_t *client, isc_nmhandle_t *handle) { 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 * 2 + sizeof(": TSIG '' ()")]; dns_tsigkey_t *tsigkey; /* * Attach to the request handle */ isc_nmhandle_attach(handle, &client->reqhandle); /* * 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"); result = DNS_R_FORMERR; goto done; } /* * 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"); result = DNS_R_FORMERR; goto done; } /* 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"); result = DNS_R_FORMERR; goto done; } /* 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"); result = DNS_R_FORMERR; goto done; } 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) { dns_zonetype_t zonetype = dns_zone_gettype(zone); if ((zonetype == dns_zone_primary) || (zonetype == dns_zone_secondary) || (zonetype == dns_zone_mirror) || (zonetype == dns_zone_stub)) { isc_sockaddr_t *from = ns_client_getsockaddr(client); isc_sockaddr_t *to = ns_client_getdestaddr(client); notify_log(client, ISC_LOG_INFO, "received notify for zone '%s'%s", namebuf, tsigbuf); result = dns_zone_notifyreceive(zone, from, to, request); goto done; } } notify_log(client, ISC_LOG_NOTICE, "received notify for zone '%s'%s: not authoritative", namebuf, tsigbuf); result = DNS_R_NOTAUTH; done: if (zone != NULL) { dns_zone_detach(&zone); } respond(client, result); }