diff options
Diffstat (limited to 'lib/ns/notify.c')
| -rw-r--r-- | lib/ns/notify.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/lib/ns/notify.c b/lib/ns/notify.c new file mode 100644 index 0000000..86f8647 --- /dev/null +++ b/lib/ns/notify.c @@ -0,0 +1,179 @@ +/* + * 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 <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 <ns/log.h> +#include <ns/notify.h> +#include <ns/types.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, 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); +} |