2 Unix SMB/CIFS implementation.
6 Copyright (C) 2010 Kai Blin <kai@samba.org>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "smbd/service_task.h"
24 #include "smbd/service.h"
25 #include "smbd/service_stream.h"
26 #include "smbd/process_model.h"
27 #include "lib/events/events.h"
28 #include "lib/socket/socket.h"
29 #include "lib/tsocket/tsocket.h"
30 #include "libcli/util/tstream.h"
31 #include "libcli/util/ntstatus.h"
32 #include "system/network.h"
33 #include "lib/stream/packet.h"
34 #include "lib/socket/netif.h"
35 #include "dns_server/dns_server.h"
36 #include "param/param.h"
37 #include "librpc/ndr/libndr.h"
38 #include "librpc/gen_ndr/ndr_dns.h"
39 #include "librpc/gen_ndr/ndr_dnsp.h"
41 #include "dsdb/samdb/samdb.h"
42 #include "dsdb/common/util.h"
43 #include "auth/session.h"
44 #include "lib/util/dlinklist.h"
46 NTSTATUS
server_service_dns_init(void);
48 /* hold information about one dns socket */
50 struct dns_server
*dns
;
51 struct tsocket_address
*local_address
;
54 struct dns_udp_socket
{
55 struct dns_socket
*dns_socket
;
56 struct tdgram_context
*dgram
;
57 struct tevent_queue
*send_queue
;
61 state of an open tcp connection
63 struct dns_tcp_connection
{
64 /* stream connection we belong to */
65 struct stream_connection
*conn
;
67 /* the dns_server the connection belongs to */
68 struct dns_socket
*dns_socket
;
70 struct tstream_context
*tstream
;
72 struct tevent_queue
*send_queue
;
75 static void dns_tcp_terminate_connection(struct dns_tcp_connection
*dnsconn
, const char *reason
)
77 stream_terminate_connection(dnsconn
->conn
, reason
);
80 static void dns_tcp_recv(struct stream_connection
*conn
, uint16_t flags
)
82 struct dns_tcp_connection
*dnsconn
= talloc_get_type(conn
->private_data
,
83 struct dns_tcp_connection
);
84 /* this should never be triggered! */
85 dns_tcp_terminate_connection(dnsconn
, "dns_tcp_recv: called");
88 static void dns_tcp_send(struct stream_connection
*conn
, uint16_t flags
)
90 struct dns_tcp_connection
*dnsconn
= talloc_get_type(conn
->private_data
,
91 struct dns_tcp_connection
);
92 /* this should never be triggered! */
93 dns_tcp_terminate_connection(dnsconn
, "dns_tcp_send: called");
96 static NTSTATUS
dns_process(struct dns_server
*dns
,
101 enum ndr_err_code ndr_err
;
103 struct dns_name_packet
*in_packet
;
104 struct dns_name_packet
*out_packet
;
105 struct dns_res_rec
*answers
= NULL
, *nsrecs
= NULL
, *additional
= NULL
;
106 uint16_t num_answers
= 0 , num_nsrecs
= 0, num_additional
= 0;
108 if (in
->length
< 12) {
109 return NT_STATUS_INVALID_PARAMETER
;
112 in_packet
= talloc_zero(mem_ctx
, struct dns_name_packet
);
113 /* TODO: We don't really need an out_packet. */
114 out_packet
= talloc_zero(mem_ctx
, struct dns_name_packet
);
116 if (in_packet
== NULL
) return NT_STATUS_NO_MEMORY
;
117 if (out_packet
== NULL
) return NT_STATUS_NO_MEMORY
;
119 dump_data(2, in
->data
, in
->length
);
121 ndr_err
= ndr_pull_struct_blob(in
, in_packet
, in_packet
,
122 (ndr_pull_flags_fn_t
)ndr_pull_dns_name_packet
);
123 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err
)) {
124 TALLOC_FREE(in_packet
);
125 DEBUG(0, ("Failed to parse packet %d!\n", ndr_err
));
128 out
->data
[2] |= 0x80; /* Toggle DNS_FLAG_REPLY */
129 out
->data
[3] |= DNS_RCODE_FORMERR
;
134 NDR_PRINT_DEBUG(dns_name_packet
, in_packet
);
136 *out_packet
= *in_packet
;
137 out_packet
->operation
|= DNS_FLAG_REPLY
;
139 switch (in_packet
->operation
& DNS_OPCODE
) {
140 case DNS_OPCODE_QUERY
:
142 ret
= dns_server_process_query(dns
, out_packet
, in_packet
,
143 &answers
, &num_answers
,
144 &nsrecs
, &num_nsrecs
,
145 &additional
, &num_additional
);
148 case DNS_OPCODE_UPDATE
:
149 ret
= dns_server_process_update(dns
, out_packet
, in_packet
,
150 &answers
, &num_answers
,
151 &nsrecs
, &num_nsrecs
,
152 &additional
, &num_additional
);
155 ret
= WERR_DNS_ERROR_RCODE_NOT_IMPLEMENTED
;
159 if (W_ERROR_IS_OK(ret
)) {
160 out_packet
->ancount
= num_answers
;
161 out_packet
->answers
= answers
;
163 out_packet
->nscount
= num_nsrecs
;
164 out_packet
->nsrecs
= nsrecs
;
166 out_packet
->arcount
= num_additional
;
167 out_packet
->additional
= additional
;
169 out_packet
->operation
|= werr_to_dns_err(ret
);
173 NDR_PRINT_DEBUG(dns_name_packet
, out_packet
);
175 ndr_err
= ndr_push_struct_blob(out
, out_packet
, out_packet
,
176 (ndr_push_flags_fn_t
)ndr_push_dns_name_packet
);
177 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err
)) {
178 TALLOC_FREE(in_packet
);
179 TALLOC_FREE(out_packet
);
180 DEBUG(0, ("Failed to push packet %d!\n", ndr_err
));
183 out
->data
[2] |= 0x80; /* Toggle DNS_FLAG_REPLY */
184 out
->data
[3] |= DNS_RCODE_SERVFAIL
;
189 dump_data(2, out
->data
, out
->length
);
193 struct dns_tcp_call
{
194 struct dns_tcp_connection
*dns_conn
;
198 struct iovec out_iov
[2];
201 static void dns_tcp_call_writev_done(struct tevent_req
*subreq
);
203 static void dns_tcp_call_loop(struct tevent_req
*subreq
)
205 struct dns_tcp_connection
*dns_conn
= tevent_req_callback_data(subreq
,
206 struct dns_tcp_connection
);
207 struct dns_tcp_call
*call
;
210 call
= talloc(dns_conn
, struct dns_tcp_call
);
212 dns_tcp_terminate_connection(dns_conn
, "dns_tcp_call_loop: "
213 "no memory for dns_tcp_call");
216 call
->dns_conn
= dns_conn
;
218 status
= tstream_read_pdu_blob_recv(subreq
,
222 if (!NT_STATUS_IS_OK(status
)) {
225 reason
= talloc_asprintf(call
, "dns_tcp_call_loop: "
226 "tstream_read_pdu_blob_recv() - %s",
229 reason
= nt_errstr(status
);
232 dns_tcp_terminate_connection(dns_conn
, reason
);
236 DEBUG(10,("Received krb5 TCP packet of length %lu from %s\n",
237 (long) call
->in
.length
,
238 tsocket_address_string(dns_conn
->conn
->remote_address
, call
)));
240 /* skip length header */
242 call
->in
.length
-= 4;
245 status
= dns_process(dns_conn
->dns_socket
->dns
, call
, &call
->in
, &call
->out
);
246 if (!NT_STATUS_IS_OK(status
)) {
247 DEBUG(0, ("dns_process returned %s\n", nt_errstr(status
)));
248 dns_tcp_terminate_connection(dns_conn
,
249 "dns_tcp_call_loop: process function failed");
253 /* First add the length of the out buffer */
254 RSIVAL(call
->out_hdr
, 0, call
->out
.length
);
255 call
->out_iov
[0].iov_base
= (char *) call
->out_hdr
;
256 call
->out_iov
[0].iov_len
= 4;
258 call
->out_iov
[1].iov_base
= (char *) call
->out
.data
;
259 call
->out_iov
[1].iov_len
= call
->out
.length
;
261 subreq
= tstream_writev_queue_send(call
,
262 dns_conn
->conn
->event
.ctx
,
264 dns_conn
->send_queue
,
266 if (subreq
== NULL
) {
267 dns_tcp_terminate_connection(dns_conn
, "dns_tcp_call_loop: "
268 "no memory for tstream_writev_queue_send");
271 tevent_req_set_callback(subreq
, dns_tcp_call_writev_done
, call
);
274 * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
275 * packet_full_request_u32 provides the pdu length then.
277 subreq
= tstream_read_pdu_blob_send(dns_conn
,
278 dns_conn
->conn
->event
.ctx
,
280 4, /* initial_read_size */
281 packet_full_request_u32
,
283 if (subreq
== NULL
) {
284 dns_tcp_terminate_connection(dns_conn
, "dns_tcp_call_loop: "
285 "no memory for tstream_read_pdu_blob_send");
288 tevent_req_set_callback(subreq
, dns_tcp_call_loop
, dns_conn
);
291 static void dns_tcp_call_writev_done(struct tevent_req
*subreq
)
293 struct dns_tcp_call
*call
= tevent_req_callback_data(subreq
,
294 struct dns_tcp_call
);
298 rc
= tstream_writev_queue_recv(subreq
, &sys_errno
);
303 reason
= talloc_asprintf(call
, "dns_tcp_call_writev_done: "
304 "tstream_writev_queue_recv() - %d:%s",
305 sys_errno
, strerror(sys_errno
));
307 reason
= "dns_tcp_call_writev_done: tstream_writev_queue_recv() failed";
310 dns_tcp_terminate_connection(call
->dns_conn
, reason
);
314 /* We don't care about errors */
320 called when we get a new connection
322 static void dns_tcp_accept(struct stream_connection
*conn
)
324 struct dns_socket
*dns_socket
;
325 struct dns_tcp_connection
*dns_conn
;
326 struct tevent_req
*subreq
;
329 dns_conn
= talloc_zero(conn
, struct dns_tcp_connection
);
330 if (dns_conn
== NULL
) {
331 stream_terminate_connection(conn
,
332 "dns_tcp_accept: out of memory");
336 dns_conn
->send_queue
= tevent_queue_create(conn
, "dns_tcp_accept");
337 if (dns_conn
->send_queue
== NULL
) {
338 stream_terminate_connection(conn
,
339 "dns_tcp_accept: out of memory");
343 dns_socket
= talloc_get_type(conn
->private_data
, struct dns_socket
);
345 TALLOC_FREE(conn
->event
.fde
);
347 rc
= tstream_bsd_existing_socket(dns_conn
,
348 socket_get_fd(conn
->socket
),
351 stream_terminate_connection(conn
,
352 "dns_tcp_accept: out of memory");
356 dns_conn
->conn
= conn
;
357 dns_conn
->dns_socket
= dns_socket
;
358 conn
->private_data
= dns_conn
;
361 * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
362 * packet_full_request_u32 provides the pdu length then.
364 subreq
= tstream_read_pdu_blob_send(dns_conn
,
365 dns_conn
->conn
->event
.ctx
,
367 4, /* initial_read_size */
368 packet_full_request_u32
,
370 if (subreq
== NULL
) {
371 dns_tcp_terminate_connection(dns_conn
, "dns_tcp_accept: "
372 "no memory for tstream_read_pdu_blob_send");
375 tevent_req_set_callback(subreq
, dns_tcp_call_loop
, dns_conn
);
378 static const struct stream_server_ops dns_tcp_stream_ops
= {
380 .accept_connection
= dns_tcp_accept
,
381 .recv_handler
= dns_tcp_recv
,
382 .send_handler
= dns_tcp_send
385 struct dns_udp_call
{
386 struct tsocket_address
*src
;
391 static void dns_udp_call_sendto_done(struct tevent_req
*subreq
);
393 static void dns_udp_call_loop(struct tevent_req
*subreq
)
395 struct dns_udp_socket
*sock
= tevent_req_callback_data(subreq
,
396 struct dns_udp_socket
);
397 struct dns_udp_call
*call
;
403 call
= talloc(sock
, struct dns_udp_call
);
409 len
= tdgram_recvfrom_recv(subreq
, &sys_errno
,
410 call
, &buf
, &call
->src
);
418 call
->in
.length
= len
;
420 DEBUG(10,("Received DNS UDP packet of length %lu from %s\n",
421 (long)call
->in
.length
,
422 tsocket_address_string(call
->src
, call
)));
424 /* Call dns_process */
425 status
= dns_process(sock
->dns_socket
->dns
, call
, &call
->in
, &call
->out
);
426 if (!NT_STATUS_IS_OK(status
)) {
428 DEBUG(0, ("dns_process returned %s\n", nt_errstr(status
)));
432 subreq
= tdgram_sendto_queue_send(call
,
433 sock
->dns_socket
->dns
->task
->event_ctx
,
439 if (subreq
== NULL
) {
443 tevent_req_set_callback(subreq
, dns_udp_call_sendto_done
, call
);
446 subreq
= tdgram_recvfrom_send(sock
,
447 sock
->dns_socket
->dns
->task
->event_ctx
,
449 if (subreq
== NULL
) {
450 task_server_terminate(sock
->dns_socket
->dns
->task
,
451 "no memory for tdgram_recvfrom_send",
455 tevent_req_set_callback(subreq
, dns_udp_call_loop
, sock
);
458 static void dns_udp_call_sendto_done(struct tevent_req
*subreq
)
460 struct dns_udp_call
*call
= tevent_req_callback_data(subreq
,
461 struct dns_udp_call
);
465 ret
= tdgram_sendto_queue_recv(subreq
, &sys_errno
);
467 /* We don't care about errors */
473 start listening on the given address
475 static NTSTATUS
dns_add_socket(struct dns_server
*dns
,
476 const struct model_ops
*model_ops
,
481 struct dns_socket
*dns_socket
;
482 struct dns_udp_socket
*dns_udp_socket
;
483 struct tevent_req
*udpsubreq
;
487 dns_socket
= talloc(dns
, struct dns_socket
);
488 NT_STATUS_HAVE_NO_MEMORY(dns_socket
);
490 dns_socket
->dns
= dns
;
492 ret
= tsocket_address_inet_from_strings(dns_socket
, "ip",
494 &dns_socket
->local_address
);
496 status
= map_nt_error_from_unix_common(errno
);
500 status
= stream_setup_socket(dns
->task
,
501 dns
->task
->event_ctx
,
505 "ip", address
, &port
,
506 lpcfg_socket_options(dns
->task
->lp_ctx
),
508 if (!NT_STATUS_IS_OK(status
)) {
509 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
510 address
, port
, nt_errstr(status
)));
511 talloc_free(dns_socket
);
515 dns_udp_socket
= talloc(dns_socket
, struct dns_udp_socket
);
516 NT_STATUS_HAVE_NO_MEMORY(dns_udp_socket
);
518 dns_udp_socket
->dns_socket
= dns_socket
;
520 ret
= tdgram_inet_udp_socket(dns_socket
->local_address
,
523 &dns_udp_socket
->dgram
);
525 status
= map_nt_error_from_unix_common(errno
);
526 DEBUG(0,("Failed to bind to %s:%u UDP - %s\n",
527 address
, port
, nt_errstr(status
)));
531 dns_udp_socket
->send_queue
= tevent_queue_create(dns_udp_socket
,
532 "dns_udp_send_queue");
533 NT_STATUS_HAVE_NO_MEMORY(dns_udp_socket
->send_queue
);
535 udpsubreq
= tdgram_recvfrom_send(dns_udp_socket
,
536 dns
->task
->event_ctx
,
537 dns_udp_socket
->dgram
);
538 NT_STATUS_HAVE_NO_MEMORY(udpsubreq
);
539 tevent_req_set_callback(udpsubreq
, dns_udp_call_loop
, dns_udp_socket
);
545 setup our listening sockets on the configured network interfaces
547 static NTSTATUS
dns_startup_interfaces(struct dns_server
*dns
, struct loadparm_context
*lp_ctx
,
548 struct interface
*ifaces
)
550 const struct model_ops
*model_ops
;
552 TALLOC_CTX
*tmp_ctx
= talloc_new(dns
);
556 /* within the dns task we want to be a single process, so
557 ask for the single process model ops and pass these to the
558 stream_setup_socket() call. */
559 model_ops
= process_model_startup("single");
561 DEBUG(0,("Can't find 'single' process model_ops\n"));
562 return NT_STATUS_INTERNAL_ERROR
;
565 num_interfaces
= iface_list_count(ifaces
);
567 for (i
=0; i
<num_interfaces
; i
++) {
568 const char *address
= talloc_strdup(tmp_ctx
, iface_list_n_ip(ifaces
, i
));
570 status
= dns_add_socket(dns
, model_ops
, "dns", address
, DNS_SERVICE_PORT
);
571 NT_STATUS_NOT_OK_RETURN(status
);
574 talloc_free(tmp_ctx
);
579 static int dns_server_sort_zones(struct ldb_message
**m1
, struct ldb_message
**m2
)
584 n1
= ldb_msg_find_attr_as_string(*m1
, "name", NULL
);
585 n2
= ldb_msg_find_attr_as_string(*m2
, "name", NULL
);
590 /* If the string lengths are not equal just sort by length */
592 /* If m1 is the larger zone name, return it first */
596 /*TODO: We need to compare DNs here, we want the DomainDNSZones first */
600 static void dns_task_init(struct task_server
*task
)
602 struct dns_server
*dns
;
604 struct interface
*ifaces
;
606 struct ldb_result
*res
;
607 static const char * const attrs
[] = { "name", NULL
};
610 switch (lpcfg_server_role(task
->lp_ctx
)) {
611 case ROLE_STANDALONE
:
612 task_server_terminate(task
, "dns: no DNS required in standalone configuration", false);
614 case ROLE_DOMAIN_MEMBER
:
615 task_server_terminate(task
, "dns: no DNS required in member server configuration", false);
617 case ROLE_DOMAIN_CONTROLLER
:
618 /* Yes, we want a DNS */
622 load_interface_list(task
, task
->lp_ctx
, &ifaces
);
624 if (iface_list_count(ifaces
) == 0) {
625 task_server_terminate(task
, "dns: no network interfaces configured", false);
629 task_server_set_title(task
, "task[dns]");
631 dns
= talloc_zero(task
, struct dns_server
);
633 task_server_terminate(task
, "dns: out of memory", true);
639 dns
->samdb
= samdb_connect(dns
, dns
->task
->event_ctx
, dns
->task
->lp_ctx
,
640 system_session(dns
->task
->lp_ctx
), 0);
642 task_server_terminate(task
, "dns: samdb_connect failed", true);
646 // TODO: this search does not work against windows
647 ret
= dsdb_search(dns
->samdb
, dns
, &res
, NULL
, LDB_SCOPE_SUBTREE
,
648 attrs
, DSDB_SEARCH_SEARCH_ALL_PARTITIONS
, "(objectClass=dnsZone)");
649 if (ret
!= LDB_SUCCESS
) {
650 task_server_terminate(task
,
651 "dns: failed to look up root DNS zones",
656 TYPESAFE_QSORT(res
->msgs
, res
->count
, dns_server_sort_zones
);
658 for (i
=0; i
< res
->count
; i
++) {
659 struct dns_server_zone
*z
;
661 z
= talloc_zero(dns
, struct dns_server_zone
);
665 z
->name
= ldb_msg_find_attr_as_string(res
->msgs
[i
], "name", NULL
);
666 z
->dn
= talloc_move(z
, &res
->msgs
[i
]->dn
);
668 DLIST_ADD_END(dns
->zones
, z
, NULL
);
671 status
= dns_startup_interfaces(dns
, task
->lp_ctx
, ifaces
);
672 if (!NT_STATUS_IS_OK(status
)) {
673 task_server_terminate(task
, "dns failed to setup interfaces", true);
678 NTSTATUS
server_service_dns_init(void)
680 return register_server_service("dns", dns_task_init
);