summaryrefslogtreecommitdiff
path: root/source4/dns_server/dns_server.c
blob: e1640351bf107275f4e6dbdf95760bbe42101538 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
/*
   Unix SMB/CIFS implementation.

   DNS server startup

   Copyright (C) 2010 Kai Blin  <kai@samba.org>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "smbd/service_task.h"
#include "smbd/service.h"
#include "smbd/service_stream.h"
#include "smbd/process_model.h"
#include "lib/events/events.h"
#include "lib/socket/socket.h"
#include "lib/tsocket/tsocket.h"
#include "libcli/util/tstream.h"
#include "libcli/util/ntstatus.h"
#include "system/network.h"
#include "lib/stream/packet.h"
#include "lib/socket/netif.h"
#include "dns_server/dns_server.h"
#include "param/param.h"
#include "librpc/ndr/libndr.h"
#include "librpc/gen_ndr/ndr_dns.h"
#include "librpc/gen_ndr/ndr_dnsp.h"
#include <ldb.h>
#include "dsdb/samdb/samdb.h"
#include "dsdb/common/util.h"
#include "auth/session.h"
#include "lib/util/dlinklist.h"

NTSTATUS server_service_dns_init(void);

/* hold information about one dns socket */
struct dns_socket {
	struct dns_server *dns;
	struct tsocket_address *local_address;
};

struct dns_udp_socket {
	struct dns_socket *dns_socket;
	struct tdgram_context *dgram;
	struct tevent_queue *send_queue;
};

/*
  state of an open tcp connection
*/
struct dns_tcp_connection {
	/* stream connection we belong to */
	struct stream_connection *conn;

	/* the dns_server the connection belongs to */
	struct dns_socket *dns_socket;

	struct tstream_context *tstream;

	struct tevent_queue *send_queue;
};

static void dns_tcp_terminate_connection(struct dns_tcp_connection *dnsconn, const char *reason)
{
	stream_terminate_connection(dnsconn->conn, reason);
}

static void dns_tcp_recv(struct stream_connection *conn, uint16_t flags)
{
	struct dns_tcp_connection *dnsconn = talloc_get_type(conn->private_data,
							     struct dns_tcp_connection);
	/* this should never be triggered! */
	dns_tcp_terminate_connection(dnsconn, "dns_tcp_recv: called");
}

static void dns_tcp_send(struct stream_connection *conn, uint16_t flags)
{
	struct dns_tcp_connection *dnsconn = talloc_get_type(conn->private_data,
							     struct dns_tcp_connection);
	/* this should never be triggered! */
	dns_tcp_terminate_connection(dnsconn, "dns_tcp_send: called");
}

static NTSTATUS dns_process(struct dns_server *dns,
			    TALLOC_CTX *mem_ctx,
			    DATA_BLOB *in,
			    DATA_BLOB *out)
{
	enum ndr_err_code ndr_err;
	WERROR ret;
	struct dns_name_packet *in_packet;
	struct dns_name_packet *out_packet;
	struct dns_res_rec *answers = NULL, *nsrecs = NULL, *additional = NULL;
	uint16_t num_answers = 0 , num_nsrecs = 0, num_additional = 0;

	if (in->length < 12) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	in_packet = talloc_zero(mem_ctx, struct dns_name_packet);
	/* TODO: We don't really need an out_packet. */
	out_packet = talloc_zero(mem_ctx, struct dns_name_packet);

	if (in_packet == NULL) return NT_STATUS_NO_MEMORY;
	if (out_packet == NULL) return NT_STATUS_NO_MEMORY;

	dump_data(2, in->data, in->length);

	ndr_err = ndr_pull_struct_blob(in, in_packet, in_packet,
			(ndr_pull_flags_fn_t)ndr_pull_dns_name_packet);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		TALLOC_FREE(in_packet);
		DEBUG(0, ("Failed to parse packet %d!\n", ndr_err));
		*out = *in;

		out->data[2] |= 0x80; /* Toggle DNS_FLAG_REPLY */
		out->data[3] |= DNS_RCODE_FORMERR;

		return NT_STATUS_OK;
	}

	NDR_PRINT_DEBUG(dns_name_packet, in_packet);
	*out_packet = *in_packet;
	out_packet->operation |= DNS_FLAG_REPLY;

	switch (in_packet->operation & DNS_OPCODE) {
	case DNS_OPCODE_QUERY:

		ret = dns_server_process_query(dns, out_packet, in_packet,
					       &answers, &num_answers,
					       &nsrecs,  &num_nsrecs,
					       &additional, &num_additional);

		break;
	case DNS_OPCODE_REGISTER:
		ret = dns_server_process_update(dns, out_packet, in_packet,
						answers, num_answers,
						&nsrecs,  &num_nsrecs,
						&additional, &num_additional);
		break;
	default:
		ret = WERR_DNS_ERROR_RCODE_NOT_IMPLEMENTED;
		break;
	}

	if (W_ERROR_IS_OK(ret)) {
		out_packet->ancount = num_answers;
		out_packet->answers = answers;

		out_packet->nscount = num_nsrecs;
		out_packet->nsrecs  = nsrecs;

		out_packet->arcount = num_additional;
		out_packet->additional = additional;
	} else {
		out_packet->operation |= werr_to_dns_err(ret);
	}

	NDR_PRINT_DEBUG(dns_name_packet, out_packet);
	ndr_err = ndr_push_struct_blob(out, out_packet, out_packet,
			(ndr_push_flags_fn_t)ndr_push_dns_name_packet);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		TALLOC_FREE(in_packet);
		TALLOC_FREE(out_packet);
		DEBUG(0, ("Failed to push packet %d!\n", ndr_err));
		*out = *in;

		out->data[2] |= 0x80; /* Toggle DNS_FLAG_REPLY */
		out->data[3] |= DNS_RCODE_SERVFAIL;

		return NT_STATUS_OK;
	}

	dump_data(2, out->data, out->length);
	return NT_STATUS_OK;
}

struct dns_tcp_call {
	struct dns_tcp_connection *dns_conn;
	DATA_BLOB in;
	DATA_BLOB out;
	uint8_t out_hdr[4];
	struct iovec out_iov[2];
};

static void dns_tcp_call_writev_done(struct tevent_req *subreq);

static void dns_tcp_call_loop(struct tevent_req *subreq)
{
	struct dns_tcp_connection *dns_conn = tevent_req_callback_data(subreq,
				      struct dns_tcp_connection);
	struct dns_tcp_call *call;
	NTSTATUS status;

	call = talloc(dns_conn, struct dns_tcp_call);
	if (call == NULL) {
		dns_tcp_terminate_connection(dns_conn, "dns_tcp_call_loop: "
				"no memory for dns_tcp_call");
		return;
	}
	call->dns_conn = dns_conn;

	status = tstream_read_pdu_blob_recv(subreq,
					    call,
					    &call->in);
	TALLOC_FREE(subreq);
	if (!NT_STATUS_IS_OK(status)) {
		const char *reason;

		reason = talloc_asprintf(call, "dns_tcp_call_loop: "
					 "tstream_read_pdu_blob_recv() - %s",
					 nt_errstr(status));
		if (!reason) {
			reason = nt_errstr(status);
		}

		dns_tcp_terminate_connection(dns_conn, reason);
		return;
	}

	DEBUG(10,("Received krb5 TCP packet of length %lu from %s\n",
		 (long) call->in.length,
		 tsocket_address_string(dns_conn->conn->remote_address, call)));

	/* skip length header */
	call->in.data +=4;
	call->in.length -= 4;

	/* Call dns */
	status = dns_process(dns_conn->dns_socket->dns, call, &call->in, &call->out);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("dns_process returned %s\n", nt_errstr(status)));
		dns_tcp_terminate_connection(dns_conn,
				"dns_tcp_call_loop: process function failed");
		return;
	}

	/* First add the length of the out buffer */
	RSIVAL(call->out_hdr, 0, call->out.length);
	call->out_iov[0].iov_base = (char *) call->out_hdr;
	call->out_iov[0].iov_len = 4;

	call->out_iov[1].iov_base = (char *) call->out.data;
	call->out_iov[1].iov_len = call->out.length;

	subreq = tstream_writev_queue_send(call,
					   dns_conn->conn->event.ctx,
					   dns_conn->tstream,
					   dns_conn->send_queue,
					   call->out_iov, 2);
	if (subreq == NULL) {
		dns_tcp_terminate_connection(dns_conn, "dns_tcp_call_loop: "
				"no memory for tstream_writev_queue_send");
		return;
	}
	tevent_req_set_callback(subreq, dns_tcp_call_writev_done, call);

	/*
	 * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
	 * packet_full_request_u32 provides the pdu length then.
	 */
	subreq = tstream_read_pdu_blob_send(dns_conn,
					    dns_conn->conn->event.ctx,
					    dns_conn->tstream,
					    4, /* initial_read_size */
					    packet_full_request_u32,
					    dns_conn);
	if (subreq == NULL) {
		dns_tcp_terminate_connection(dns_conn, "dns_tcp_call_loop: "
				"no memory for tstream_read_pdu_blob_send");
		return;
	}
	tevent_req_set_callback(subreq, dns_tcp_call_loop, dns_conn);
}

static void dns_tcp_call_writev_done(struct tevent_req *subreq)
{
	struct dns_tcp_call *call = tevent_req_callback_data(subreq,
			struct dns_tcp_call);
	int sys_errno;
	int rc;

	rc = tstream_writev_queue_recv(subreq, &sys_errno);
	TALLOC_FREE(subreq);
	if (rc == -1) {
		const char *reason;

		reason = talloc_asprintf(call, "dns_tcp_call_writev_done: "
					 "tstream_writev_queue_recv() - %d:%s",
					 sys_errno, strerror(sys_errno));
		if (!reason) {
			reason = "dns_tcp_call_writev_done: tstream_writev_queue_recv() failed";
		}

		dns_tcp_terminate_connection(call->dns_conn, reason);
		return;
	}

	/* We don't care about errors */

	talloc_free(call);
}

/*
  called when we get a new connection
*/
static void dns_tcp_accept(struct stream_connection *conn)
{
	struct dns_socket *dns_socket;
	struct dns_tcp_connection *dns_conn;
	struct tevent_req *subreq;
	int rc;

	dns_conn = talloc_zero(conn, struct dns_tcp_connection);
	if (dns_conn == NULL) {
		stream_terminate_connection(conn,
				"dns_tcp_accept: out of memory");
		return;
	}

	dns_conn->send_queue = tevent_queue_create(conn, "dns_tcp_accept");
	if (dns_conn->send_queue == NULL) {
		stream_terminate_connection(conn,
				"dns_tcp_accept: out of memory");
		return;
	}

	dns_socket = talloc_get_type(conn->private_data, struct dns_socket);

	TALLOC_FREE(conn->event.fde);

	rc = tstream_bsd_existing_socket(dns_conn,
			socket_get_fd(conn->socket),
			&dns_conn->tstream);
	if (rc < 0) {
		stream_terminate_connection(conn,
				"dns_tcp_accept: out of memory");
		return;
	}

	dns_conn->conn = conn;
	dns_conn->dns_socket = dns_socket;
	conn->private_data = dns_conn;

	/*
	 * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
	 * packet_full_request_u32 provides the pdu length then.
	 */
	subreq = tstream_read_pdu_blob_send(dns_conn,
					    dns_conn->conn->event.ctx,
					    dns_conn->tstream,
					    4, /* initial_read_size */
					    packet_full_request_u32,
					    dns_conn);
	if (subreq == NULL) {
		dns_tcp_terminate_connection(dns_conn, "dns_tcp_accept: "
				"no memory for tstream_read_pdu_blob_send");
		return;
	}
	tevent_req_set_callback(subreq, dns_tcp_call_loop, dns_conn);
}

static const struct stream_server_ops dns_tcp_stream_ops = {
	.name			= "dns_tcp",
	.accept_connection	= dns_tcp_accept,
	.recv_handler		= dns_tcp_recv,
	.send_handler		= dns_tcp_send
};

struct dns_udp_call {
	struct tsocket_address *src;
	DATA_BLOB in;
	DATA_BLOB out;
};

static void dns_udp_call_sendto_done(struct tevent_req *subreq);

static void dns_udp_call_loop(struct tevent_req *subreq)
{
	struct dns_udp_socket *sock = tevent_req_callback_data(subreq,
				      struct dns_udp_socket);
	struct dns_udp_call *call;
	uint8_t *buf;
	ssize_t len;
	int sys_errno;
	NTSTATUS status;

	call = talloc(sock, struct dns_udp_call);
	if (call == NULL) {
		talloc_free(call);
		goto done;
	}

	len = tdgram_recvfrom_recv(subreq, &sys_errno,
				   call, &buf, &call->src);
	TALLOC_FREE(subreq);
	if (len == -1) {
		talloc_free(call);
		goto done;
	}

	call->in.data = buf;
	call->in.length = len;

	DEBUG(10,("Received krb5 UDP packet of length %lu from %s\n",
		 (long)call->in.length,
		 tsocket_address_string(call->src, call)));

	/* Call krb5 */
	status = dns_process(sock->dns_socket->dns, call, &call->in, &call->out);
	if (!NT_STATUS_IS_OK(status)) {
		talloc_free(call);
		DEBUG(0, ("dns_process returned %s\n", nt_errstr(status)));
		goto done;
	}

	subreq = tdgram_sendto_queue_send(call,
					  sock->dns_socket->dns->task->event_ctx,
					  sock->dgram,
					  sock->send_queue,
					  call->out.data,
					  call->out.length,
					  call->src);
	if (subreq == NULL) {
		talloc_free(call);
		goto done;
	}
	tevent_req_set_callback(subreq, dns_udp_call_sendto_done, call);

done:
	subreq = tdgram_recvfrom_send(sock,
				      sock->dns_socket->dns->task->event_ctx,
				      sock->dgram);
	if (subreq == NULL) {
		task_server_terminate(sock->dns_socket->dns->task,
				      "no memory for tdgram_recvfrom_send",
				      true);
		return;
	}
	tevent_req_set_callback(subreq, dns_udp_call_loop, sock);
}

static void dns_udp_call_sendto_done(struct tevent_req *subreq)
{
	struct dns_udp_call *call = tevent_req_callback_data(subreq,
				       struct dns_udp_call);
	ssize_t ret;
	int sys_errno;

	ret = tdgram_sendto_queue_recv(subreq, &sys_errno);

	/* We don't care about errors */

	talloc_free(call);
}

/*
  start listening on the given address
*/
static NTSTATUS dns_add_socket(struct dns_server *dns,
			       const struct model_ops *model_ops,
			       const char *name,
			       const char *address,
			       uint16_t port)
{
	struct dns_socket *dns_socket;
	struct dns_udp_socket *dns_udp_socket;
	struct tevent_req *udpsubreq;
	NTSTATUS status;
	int ret;

	dns_socket = talloc(dns, struct dns_socket);
	NT_STATUS_HAVE_NO_MEMORY(dns_socket);

	dns_socket->dns = dns;

	ret = tsocket_address_inet_from_strings(dns_socket, "ip",
						address, port,
						&dns_socket->local_address);
	if (ret != 0) {
		status = map_nt_error_from_unix_common(errno);
		return status;
	}

	status = stream_setup_socket(dns->task,
				     dns->task->event_ctx,
				     dns->task->lp_ctx,
				     model_ops,
				     &dns_tcp_stream_ops,
				     "ip", address, &port,
				     lpcfg_socket_options(dns->task->lp_ctx),
				     dns_socket);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
			 address, port, nt_errstr(status)));
		talloc_free(dns_socket);
		return status;
	}

	dns_udp_socket = talloc(dns_socket, struct dns_udp_socket);
	NT_STATUS_HAVE_NO_MEMORY(dns_udp_socket);

	dns_udp_socket->dns_socket = dns_socket;

	ret = tdgram_inet_udp_socket(dns_socket->local_address,
				     NULL,
				     dns_udp_socket,
				     &dns_udp_socket->dgram);
	if (ret != 0) {
		status = map_nt_error_from_unix_common(errno);
		DEBUG(0,("Failed to bind to %s:%u UDP - %s\n",
			 address, port, nt_errstr(status)));
		return status;
	}

	dns_udp_socket->send_queue = tevent_queue_create(dns_udp_socket,
							 "dns_udp_send_queue");
	NT_STATUS_HAVE_NO_MEMORY(dns_udp_socket->send_queue);

	udpsubreq = tdgram_recvfrom_send(dns_udp_socket,
					 dns->task->event_ctx,
					 dns_udp_socket->dgram);
	NT_STATUS_HAVE_NO_MEMORY(udpsubreq);
	tevent_req_set_callback(udpsubreq, dns_udp_call_loop, dns_udp_socket);

	return NT_STATUS_OK;
}

/*
  setup our listening sockets on the configured network interfaces
*/
static NTSTATUS dns_startup_interfaces(struct dns_server *dns, struct loadparm_context *lp_ctx,
				       struct interface *ifaces)
{
	const struct model_ops *model_ops;
	int num_interfaces;
	TALLOC_CTX *tmp_ctx = talloc_new(dns);
	NTSTATUS status;
	int i;

	/* within the dns task we want to be a single process, so
	   ask for the single process model ops and pass these to the
	   stream_setup_socket() call. */
	model_ops = process_model_startup("single");
	if (!model_ops) {
		DEBUG(0,("Can't find 'single' process model_ops\n"));
		return NT_STATUS_INTERNAL_ERROR;
	}

	num_interfaces = iface_list_count(ifaces);

	for (i=0; i<num_interfaces; i++) {
		const char *address = talloc_strdup(tmp_ctx, iface_list_n_ip(ifaces, i));

		status = dns_add_socket(dns, model_ops, "dns", address, DNS_SERVICE_PORT);
		NT_STATUS_NOT_OK_RETURN(status);
	}

	talloc_free(tmp_ctx);

	return NT_STATUS_OK;
}

static int dns_server_sort_zones(struct ldb_message **m1, struct ldb_message **m2)
{
	const char *n1, *n2;
	size_t l1, l2;

	n1 = ldb_msg_find_attr_as_string(*m1, "name", NULL);
	n2 = ldb_msg_find_attr_as_string(*m2, "name", NULL);

	l1 = strlen(n1);
	l2 = strlen(n2);

	/* If the string lengths are not equal just sort by length */
	if (l1 != l2) {
		/* If m1 is the larger zone name, return it first */
		return l2 - l1;
	}

	/*TODO: We need to compare DNs here, we want the DomainDNSZones first */
	return 0;
}

static void dns_task_init(struct task_server *task)
{
	struct dns_server *dns;
	NTSTATUS status;
	struct interface *ifaces;
	int ret;
	struct ldb_result *res;
	static const char * const attrs[] = { "name", NULL};
	unsigned int i;

	switch (lpcfg_server_role(task->lp_ctx)) {
	case ROLE_STANDALONE:
		task_server_terminate(task, "dns: no DNS required in standalone configuration", false);
		return;
	case ROLE_DOMAIN_MEMBER:
		task_server_terminate(task, "dns: no DNS required in member server configuration", false);
		return;
	case ROLE_DOMAIN_CONTROLLER:
		/* Yes, we want a DNS */
		break;
	}

	load_interface_list(task, task->lp_ctx, &ifaces);

	if (iface_list_count(ifaces) == 0) {
		task_server_terminate(task, "dns: no network interfaces configured", false);
		return;
	}

	task_server_set_title(task, "task[dns]");

	dns = talloc_zero(task, struct dns_server);
	if (dns == NULL) {
		task_server_terminate(task, "dns: out of memory", true);
		return;
	}

	dns->task = task;

	dns->samdb = samdb_connect(dns, dns->task->event_ctx, dns->task->lp_ctx,
			      system_session(dns->task->lp_ctx), 0);
	if (!dns->samdb) {
		task_server_terminate(task, "dns: samdb_connect failed", true);
		return;
	}

	// TODO: this search does not work against windows
	ret = dsdb_search(dns->samdb, dns, &res, NULL, LDB_SCOPE_SUBTREE,
			  attrs, DSDB_SEARCH_SEARCH_ALL_PARTITIONS, "(objectClass=dnsZone)");
	if (ret != LDB_SUCCESS) {
		task_server_terminate(task,
				      "dns: failed to look up root DNS zones",
				      true);
		return;
	}

	TYPESAFE_QSORT(res->msgs, res->count, dns_server_sort_zones);

	for (i=0; i < res->count; i++) {
		struct dns_server_zone *z;

		z = talloc_zero(dns, struct dns_server_zone);
		if (z == NULL) {
		}

		z->name = ldb_msg_find_attr_as_string(res->msgs[i], "name", NULL);
		z->dn = talloc_move(z, &res->msgs[i]->dn);

		DLIST_ADD_END(dns->zones, z, NULL);
	}

	status = dns_startup_interfaces(dns, task->lp_ctx, ifaces);
	if (!NT_STATUS_IS_OK(status)) {
		task_server_terminate(task, "dns failed to setup interfaces", true);
		return;
	}
}

NTSTATUS server_service_dns_init(void)
{
	return register_server_service("dns", dns_task_init);
}