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Viewing changes to source4/dns_server/dns_server.c

  • Committer: Package Import Robot
  • Author(s): Chuck Short
  • Date: 2011-12-21 13:18:04 UTC
  • mfrom: (0.39.21 sid)
  • Revision ID: package-import@ubuntu.com-20111221131804-xtlr39wx6njehxxr
Tags: 2:3.6.1-3ubuntu1
* Merge from Debian testing.  Remaining changes:
  + debian/patches/VERSION.patch:
    - set SAMBA_VERSION_SUFFIX to Ubuntu.
  + debian/patches/error-trans.fix-276472:
    - Add the translation of Unix Error code -ENOTSUP to NT Error Code
    - NT_STATUS_NOT_SUPPORTED to prevent the Permission denied error.
  + debian/smb.conf:
    - add "(Samba, Ubuntu)" to server string.
    - comment out the default [homes] share, and add a comment about
      "valid users = %S" to show users how to restrict access to
      \\server\username to only username.
    - Set 'usershare allow guests', so that usershare admins are 
      allowed to create public shares in addition to authenticated
      ones.
    - add map to guest = Bad user, maps bad username to guest access.
  + debian/samba-common.config:
    - Do not change priority to high if dhclient3 is installed.
    - Use priority medium instead of high for the workgroup question.
  + debian/control:
    - Don't build against or suggest ctdb.
    - Add dependency on samba-common-bin to samba.
  + Add ufw integration:
    - Created debian/samba.ufw.profile
    - debian/rules, debian/samba.dirs, debian/samba.files: install
      profile
    - debian/control: have samba suggest ufw
  + Add apport hook:
    - Created debian/source_samba.py.
    - debian/rules, debian/samba.dirs, debian/samba-common-bin.files: install
  + Switch to upstart:
    - Add debian/samba.{nmbd,smbd}.upstart.
  + debian/samba.logrotate, debian/samba-common.dhcp, debian/samba.if-up:
    - Make them upstart compatible
  + debian/samba.postinst: 
    - Avoid scary pdbedit warnings on first import.
  + debian/samba-common.postinst: Add more informative error message for
    the case where smb.conf was manually deleted
  + debian/patches/fix-debuglevel-name-conflict.patch: don't use 'debug_level'
    as a global variable name in an NSS module 
  + Dropped:
    - debian/patches/error-trans.fix-276472
    - debian/patches/fix-debuglevel-name-conflict.patch

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source4/dns_server/dns_server.c
 
1
/*
 
2
   Unix SMB/CIFS implementation.
 
3
 
 
4
   DNS server startup
 
5
 
 
6
   Copyright (C) 2010 Kai Blin  <kai@samba.org>
 
7
 
 
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.
 
12
 
 
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.
 
17
 
 
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/>.
 
20
*/
 
21
 
 
22
#include "includes.h"
 
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"
 
40
#include <ldb.h>
 
41
#include "dsdb/samdb/samdb.h"
 
42
#include "dsdb/common/util.h"
 
43
#include "auth/session.h"
 
44
#include "lib/util/dlinklist.h"
 
45
 
 
46
/* hold information about one dns socket */
 
47
struct dns_socket {
 
48
        struct dns_server *dns;
 
49
        struct tsocket_address *local_address;
 
50
};
 
51
 
 
52
struct dns_udp_socket {
 
53
        struct dns_socket *dns_socket;
 
54
        struct tdgram_context *dgram;
 
55
        struct tevent_queue *send_queue;
 
56
};
 
57
 
 
58
/*
 
59
  state of an open tcp connection
 
60
*/
 
61
struct dns_tcp_connection {
 
62
        /* stream connection we belong to */
 
63
        struct stream_connection *conn;
 
64
 
 
65
        /* the dns_server the connection belongs to */
 
66
        struct dns_socket *dns_socket;
 
67
 
 
68
        struct tstream_context *tstream;
 
69
 
 
70
        struct tevent_queue *send_queue;
 
71
};
 
72
 
 
73
static void dns_tcp_terminate_connection(struct dns_tcp_connection *dnsconn, const char *reason)
 
74
{
 
75
        stream_terminate_connection(dnsconn->conn, reason);
 
76
}
 
77
 
 
78
static void dns_tcp_recv(struct stream_connection *conn, uint16_t flags)
 
79
{
 
80
        struct dns_tcp_connection *dnsconn = talloc_get_type(conn->private_data,
 
81
                                                             struct dns_tcp_connection);
 
82
        /* this should never be triggered! */
 
83
        dns_tcp_terminate_connection(dnsconn, "dns_tcp_recv: called");
 
84
}
 
85
 
 
86
static void dns_tcp_send(struct stream_connection *conn, uint16_t flags)
 
87
{
 
88
        struct dns_tcp_connection *dnsconn = talloc_get_type(conn->private_data,
 
89
                                                             struct dns_tcp_connection);
 
90
        /* this should never be triggered! */
 
91
        dns_tcp_terminate_connection(dnsconn, "dns_tcp_send: called");
 
92
}
 
93
 
 
94
static NTSTATUS dns_process(struct dns_server *dns,
 
95
                            TALLOC_CTX *mem_ctx,
 
96
                            DATA_BLOB *in,
 
97
                            DATA_BLOB *out)
 
98
{
 
99
        enum ndr_err_code ndr_err;
 
100
        WERROR ret;
 
101
        struct dns_name_packet *in_packet;
 
102
        struct dns_name_packet *out_packet;
 
103
        struct dns_res_rec *answers = NULL, *nsrecs = NULL, *additional = NULL;
 
104
        uint16_t num_answers = 0 , num_nsrecs = 0, num_additional = 0;
 
105
 
 
106
        if (in->length < 12) {
 
107
                return NT_STATUS_INVALID_PARAMETER;
 
108
        }
 
109
 
 
110
        in_packet = talloc_zero(mem_ctx, struct dns_name_packet);
 
111
        /* TODO: We don't really need an out_packet. */
 
112
        out_packet = talloc_zero(mem_ctx, struct dns_name_packet);
 
113
 
 
114
        if (in_packet == NULL) return NT_STATUS_NO_MEMORY;
 
115
        if (out_packet == NULL) return NT_STATUS_NO_MEMORY;
 
116
 
 
117
        dump_data(2, in->data, in->length);
 
118
 
 
119
        ndr_err = ndr_pull_struct_blob(in, in_packet, in_packet,
 
120
                        (ndr_pull_flags_fn_t)ndr_pull_dns_name_packet);
 
121
        if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 
122
                TALLOC_FREE(in_packet);
 
123
                DEBUG(0, ("Failed to parse packet %d!\n", ndr_err));
 
124
                *out = *in;
 
125
 
 
126
                out->data[2] |= 0x80; /* Toggle DNS_FLAG_REPLY */
 
127
                out->data[3] |= DNS_RCODE_FORMERR;
 
128
 
 
129
                return NT_STATUS_OK;
 
130
        }
 
131
 
 
132
        NDR_PRINT_DEBUG(dns_name_packet, in_packet);
 
133
        *out_packet = *in_packet;
 
134
        out_packet->operation |= DNS_FLAG_REPLY;
 
135
 
 
136
        switch (in_packet->operation & DNS_OPCODE) {
 
137
        case DNS_OPCODE_QUERY:
 
138
 
 
139
                ret = dns_server_process_query(dns, out_packet, in_packet,
 
140
                                               &answers, &num_answers,
 
141
                                               &nsrecs,  &num_nsrecs,
 
142
                                               &additional, &num_additional);
 
143
 
 
144
                break;
 
145
        case DNS_OPCODE_REGISTER:
 
146
                ret = dns_server_process_update(dns, out_packet, in_packet,
 
147
                                                answers, num_answers,
 
148
                                                &nsrecs,  &num_nsrecs,
 
149
                                                &additional, &num_additional);
 
150
                break;
 
151
        default:
 
152
                ret = WERR_DNS_ERROR_RCODE_NOT_IMPLEMENTED;
 
153
                break;
 
154
        }
 
155
 
 
156
        if (W_ERROR_IS_OK(ret)) {
 
157
                out_packet->ancount = num_answers;
 
158
                out_packet->answers = answers;
 
159
 
 
160
                out_packet->nscount = num_nsrecs;
 
161
                out_packet->nsrecs  = nsrecs;
 
162
 
 
163
                out_packet->arcount = num_additional;
 
164
                out_packet->additional = additional;
 
165
        } else {
 
166
                out_packet->operation |= werr_to_dns_err(ret);
 
167
        }
 
168
 
 
169
        NDR_PRINT_DEBUG(dns_name_packet, out_packet);
 
170
        ndr_err = ndr_push_struct_blob(out, out_packet, out_packet,
 
171
                        (ndr_push_flags_fn_t)ndr_push_dns_name_packet);
 
172
        if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 
173
                TALLOC_FREE(in_packet);
 
174
                TALLOC_FREE(out_packet);
 
175
                DEBUG(0, ("Failed to push packet %d!\n", ndr_err));
 
176
                *out = *in;
 
177
 
 
178
                out->data[2] |= 0x80; /* Toggle DNS_FLAG_REPLY */
 
179
                out->data[3] |= DNS_RCODE_SERVFAIL;
 
180
 
 
181
                return NT_STATUS_OK;
 
182
        }
 
183
 
 
184
        dump_data(2, out->data, out->length);
 
185
        return NT_STATUS_OK;
 
186
}
 
187
 
 
188
struct dns_tcp_call {
 
189
        struct dns_tcp_connection *dns_conn;
 
190
        DATA_BLOB in;
 
191
        DATA_BLOB out;
 
192
        uint8_t out_hdr[4];
 
193
        struct iovec out_iov[2];
 
194
};
 
195
 
 
196
static void dns_tcp_call_writev_done(struct tevent_req *subreq);
 
197
 
 
198
static void dns_tcp_call_loop(struct tevent_req *subreq)
 
199
{
 
200
        struct dns_tcp_connection *dns_conn = tevent_req_callback_data(subreq,
 
201
                                      struct dns_tcp_connection);
 
202
        struct dns_tcp_call *call;
 
203
        NTSTATUS status;
 
204
 
 
205
        call = talloc(dns_conn, struct dns_tcp_call);
 
206
        if (call == NULL) {
 
207
                dns_tcp_terminate_connection(dns_conn, "dns_tcp_call_loop: "
 
208
                                "no memory for dns_tcp_call");
 
209
                return;
 
210
        }
 
211
        call->dns_conn = dns_conn;
 
212
 
 
213
        status = tstream_read_pdu_blob_recv(subreq,
 
214
                                            call,
 
215
                                            &call->in);
 
216
        TALLOC_FREE(subreq);
 
217
        if (!NT_STATUS_IS_OK(status)) {
 
218
                const char *reason;
 
219
 
 
220
                reason = talloc_asprintf(call, "dns_tcp_call_loop: "
 
221
                                         "tstream_read_pdu_blob_recv() - %s",
 
222
                                         nt_errstr(status));
 
223
                if (!reason) {
 
224
                        reason = nt_errstr(status);
 
225
                }
 
226
 
 
227
                dns_tcp_terminate_connection(dns_conn, reason);
 
228
                return;
 
229
        }
 
230
 
 
231
        DEBUG(10,("Received krb5 TCP packet of length %lu from %s\n",
 
232
                 (long) call->in.length,
 
233
                 tsocket_address_string(dns_conn->conn->remote_address, call)));
 
234
 
 
235
        /* skip length header */
 
236
        call->in.data +=4;
 
237
        call->in.length -= 4;
 
238
 
 
239
        /* Call dns */
 
240
        status = dns_process(dns_conn->dns_socket->dns, call, &call->in, &call->out);
 
241
        if (!NT_STATUS_IS_OK(status)) {
 
242
                DEBUG(0, ("dns_process returned %s\n", nt_errstr(status)));
 
243
                dns_tcp_terminate_connection(dns_conn,
 
244
                                "dns_tcp_call_loop: process function failed");
 
245
                return;
 
246
        }
 
247
 
 
248
        /* First add the length of the out buffer */
 
249
        RSIVAL(call->out_hdr, 0, call->out.length);
 
250
        call->out_iov[0].iov_base = (char *) call->out_hdr;
 
251
        call->out_iov[0].iov_len = 4;
 
252
 
 
253
        call->out_iov[1].iov_base = (char *) call->out.data;
 
254
        call->out_iov[1].iov_len = call->out.length;
 
255
 
 
256
        subreq = tstream_writev_queue_send(call,
 
257
                                           dns_conn->conn->event.ctx,
 
258
                                           dns_conn->tstream,
 
259
                                           dns_conn->send_queue,
 
260
                                           call->out_iov, 2);
 
261
        if (subreq == NULL) {
 
262
                dns_tcp_terminate_connection(dns_conn, "dns_tcp_call_loop: "
 
263
                                "no memory for tstream_writev_queue_send");
 
264
                return;
 
265
        }
 
266
        tevent_req_set_callback(subreq, dns_tcp_call_writev_done, call);
 
267
 
 
268
        /*
 
269
         * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
 
270
         * packet_full_request_u32 provides the pdu length then.
 
271
         */
 
272
        subreq = tstream_read_pdu_blob_send(dns_conn,
 
273
                                            dns_conn->conn->event.ctx,
 
274
                                            dns_conn->tstream,
 
275
                                            4, /* initial_read_size */
 
276
                                            packet_full_request_u32,
 
277
                                            dns_conn);
 
278
        if (subreq == NULL) {
 
279
                dns_tcp_terminate_connection(dns_conn, "dns_tcp_call_loop: "
 
280
                                "no memory for tstream_read_pdu_blob_send");
 
281
                return;
 
282
        }
 
283
        tevent_req_set_callback(subreq, dns_tcp_call_loop, dns_conn);
 
284
}
 
285
 
 
286
static void dns_tcp_call_writev_done(struct tevent_req *subreq)
 
287
{
 
288
        struct dns_tcp_call *call = tevent_req_callback_data(subreq,
 
289
                        struct dns_tcp_call);
 
290
        int sys_errno;
 
291
        int rc;
 
292
 
 
293
        rc = tstream_writev_queue_recv(subreq, &sys_errno);
 
294
        TALLOC_FREE(subreq);
 
295
        if (rc == -1) {
 
296
                const char *reason;
 
297
 
 
298
                reason = talloc_asprintf(call, "dns_tcp_call_writev_done: "
 
299
                                         "tstream_writev_queue_recv() - %d:%s",
 
300
                                         sys_errno, strerror(sys_errno));
 
301
                if (!reason) {
 
302
                        reason = "dns_tcp_call_writev_done: tstream_writev_queue_recv() failed";
 
303
                }
 
304
 
 
305
                dns_tcp_terminate_connection(call->dns_conn, reason);
 
306
                return;
 
307
        }
 
308
 
 
309
        /* We don't care about errors */
 
310
 
 
311
        talloc_free(call);
 
312
}
 
313
 
 
314
/*
 
315
  called when we get a new connection
 
316
*/
 
317
static void dns_tcp_accept(struct stream_connection *conn)
 
318
{
 
319
        struct dns_socket *dns_socket;
 
320
        struct dns_tcp_connection *dns_conn;
 
321
        struct tevent_req *subreq;
 
322
        int rc;
 
323
 
 
324
        dns_conn = talloc_zero(conn, struct dns_tcp_connection);
 
325
        if (dns_conn == NULL) {
 
326
                stream_terminate_connection(conn,
 
327
                                "dns_tcp_accept: out of memory");
 
328
                return;
 
329
        }
 
330
 
 
331
        dns_conn->send_queue = tevent_queue_create(conn, "dns_tcp_accept");
 
332
        if (dns_conn->send_queue == NULL) {
 
333
                stream_terminate_connection(conn,
 
334
                                "dns_tcp_accept: out of memory");
 
335
                return;
 
336
        }
 
337
 
 
338
        dns_socket = talloc_get_type(conn->private_data, struct dns_socket);
 
339
 
 
340
        TALLOC_FREE(conn->event.fde);
 
341
 
 
342
        rc = tstream_bsd_existing_socket(dns_conn,
 
343
                        socket_get_fd(conn->socket),
 
344
                        &dns_conn->tstream);
 
345
        if (rc < 0) {
 
346
                stream_terminate_connection(conn,
 
347
                                "dns_tcp_accept: out of memory");
 
348
                return;
 
349
        }
 
350
 
 
351
        dns_conn->conn = conn;
 
352
        dns_conn->dns_socket = dns_socket;
 
353
        conn->private_data = dns_conn;
 
354
 
 
355
        /*
 
356
         * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
 
357
         * packet_full_request_u32 provides the pdu length then.
 
358
         */
 
359
        subreq = tstream_read_pdu_blob_send(dns_conn,
 
360
                                            dns_conn->conn->event.ctx,
 
361
                                            dns_conn->tstream,
 
362
                                            4, /* initial_read_size */
 
363
                                            packet_full_request_u32,
 
364
                                            dns_conn);
 
365
        if (subreq == NULL) {
 
366
                dns_tcp_terminate_connection(dns_conn, "dns_tcp_accept: "
 
367
                                "no memory for tstream_read_pdu_blob_send");
 
368
                return;
 
369
        }
 
370
        tevent_req_set_callback(subreq, dns_tcp_call_loop, dns_conn);
 
371
}
 
372
 
 
373
static const struct stream_server_ops dns_tcp_stream_ops = {
 
374
        .name                   = "dns_tcp",
 
375
        .accept_connection      = dns_tcp_accept,
 
376
        .recv_handler           = dns_tcp_recv,
 
377
        .send_handler           = dns_tcp_send
 
378
};
 
379
 
 
380
struct dns_udp_call {
 
381
        struct tsocket_address *src;
 
382
        DATA_BLOB in;
 
383
        DATA_BLOB out;
 
384
};
 
385
 
 
386
static void dns_udp_call_sendto_done(struct tevent_req *subreq);
 
387
 
 
388
static void dns_udp_call_loop(struct tevent_req *subreq)
 
389
{
 
390
        struct dns_udp_socket *sock = tevent_req_callback_data(subreq,
 
391
                                      struct dns_udp_socket);
 
392
        struct dns_udp_call *call;
 
393
        uint8_t *buf;
 
394
        ssize_t len;
 
395
        int sys_errno;
 
396
        NTSTATUS status;
 
397
 
 
398
        call = talloc(sock, struct dns_udp_call);
 
399
        if (call == NULL) {
 
400
                talloc_free(call);
 
401
                goto done;
 
402
        }
 
403
 
 
404
        len = tdgram_recvfrom_recv(subreq, &sys_errno,
 
405
                                   call, &buf, &call->src);
 
406
        TALLOC_FREE(subreq);
 
407
        if (len == -1) {
 
408
                talloc_free(call);
 
409
                goto done;
 
410
        }
 
411
 
 
412
        call->in.data = buf;
 
413
        call->in.length = len;
 
414
 
 
415
        DEBUG(10,("Received krb5 UDP packet of length %lu from %s\n",
 
416
                 (long)call->in.length,
 
417
                 tsocket_address_string(call->src, call)));
 
418
 
 
419
        /* Call krb5 */
 
420
        status = dns_process(sock->dns_socket->dns, call, &call->in, &call->out);
 
421
        if (!NT_STATUS_IS_OK(status)) {
 
422
                talloc_free(call);
 
423
                DEBUG(0, ("dns_process returned %s\n", nt_errstr(status)));
 
424
                goto done;
 
425
        }
 
426
 
 
427
        subreq = tdgram_sendto_queue_send(call,
 
428
                                          sock->dns_socket->dns->task->event_ctx,
 
429
                                          sock->dgram,
 
430
                                          sock->send_queue,
 
431
                                          call->out.data,
 
432
                                          call->out.length,
 
433
                                          call->src);
 
434
        if (subreq == NULL) {
 
435
                talloc_free(call);
 
436
                goto done;
 
437
        }
 
438
        tevent_req_set_callback(subreq, dns_udp_call_sendto_done, call);
 
439
 
 
440
done:
 
441
        subreq = tdgram_recvfrom_send(sock,
 
442
                                      sock->dns_socket->dns->task->event_ctx,
 
443
                                      sock->dgram);
 
444
        if (subreq == NULL) {
 
445
                task_server_terminate(sock->dns_socket->dns->task,
 
446
                                      "no memory for tdgram_recvfrom_send",
 
447
                                      true);
 
448
                return;
 
449
        }
 
450
        tevent_req_set_callback(subreq, dns_udp_call_loop, sock);
 
451
}
 
452
 
 
453
static void dns_udp_call_sendto_done(struct tevent_req *subreq)
 
454
{
 
455
        struct dns_udp_call *call = tevent_req_callback_data(subreq,
 
456
                                       struct dns_udp_call);
 
457
        ssize_t ret;
 
458
        int sys_errno;
 
459
 
 
460
        ret = tdgram_sendto_queue_recv(subreq, &sys_errno);
 
461
 
 
462
        /* We don't care about errors */
 
463
 
 
464
        talloc_free(call);
 
465
}
 
466
 
 
467
/*
 
468
  start listening on the given address
 
469
*/
 
470
static NTSTATUS dns_add_socket(struct dns_server *dns,
 
471
                               const struct model_ops *model_ops,
 
472
                               const char *name,
 
473
                               const char *address,
 
474
                               uint16_t port)
 
475
{
 
476
        struct dns_socket *dns_socket;
 
477
        struct dns_udp_socket *dns_udp_socket;
 
478
        struct tevent_req *udpsubreq;
 
479
        NTSTATUS status;
 
480
        int ret;
 
481
 
 
482
        dns_socket = talloc(dns, struct dns_socket);
 
483
        NT_STATUS_HAVE_NO_MEMORY(dns_socket);
 
484
 
 
485
        dns_socket->dns = dns;
 
486
 
 
487
        ret = tsocket_address_inet_from_strings(dns_socket, "ip",
 
488
                                                address, port,
 
489
                                                &dns_socket->local_address);
 
490
        if (ret != 0) {
 
491
                status = map_nt_error_from_unix(errno);
 
492
                return status;
 
493
        }
 
494
 
 
495
        status = stream_setup_socket(dns->task,
 
496
                                     dns->task->event_ctx,
 
497
                                     dns->task->lp_ctx,
 
498
                                     model_ops,
 
499
                                     &dns_tcp_stream_ops,
 
500
                                     "ip", address, &port,
 
501
                                     lpcfg_socket_options(dns->task->lp_ctx),
 
502
                                     dns_socket);
 
503
        if (!NT_STATUS_IS_OK(status)) {
 
504
                DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
 
505
                         address, port, nt_errstr(status)));
 
506
                talloc_free(dns_socket);
 
507
                return status;
 
508
        }
 
509
 
 
510
        dns_udp_socket = talloc(dns_socket, struct dns_udp_socket);
 
511
        NT_STATUS_HAVE_NO_MEMORY(dns_udp_socket);
 
512
 
 
513
        dns_udp_socket->dns_socket = dns_socket;
 
514
 
 
515
        ret = tdgram_inet_udp_socket(dns_socket->local_address,
 
516
                                     NULL,
 
517
                                     dns_udp_socket,
 
518
                                     &dns_udp_socket->dgram);
 
519
        if (ret != 0) {
 
520
                status = map_nt_error_from_unix(errno);
 
521
                DEBUG(0,("Failed to bind to %s:%u UDP - %s\n",
 
522
                         address, port, nt_errstr(status)));
 
523
                return status;
 
524
        }
 
525
 
 
526
        dns_udp_socket->send_queue = tevent_queue_create(dns_udp_socket,
 
527
                                                         "dns_udp_send_queue");
 
528
        NT_STATUS_HAVE_NO_MEMORY(dns_udp_socket->send_queue);
 
529
 
 
530
        udpsubreq = tdgram_recvfrom_send(dns_udp_socket,
 
531
                                         dns->task->event_ctx,
 
532
                                         dns_udp_socket->dgram);
 
533
        NT_STATUS_HAVE_NO_MEMORY(udpsubreq);
 
534
        tevent_req_set_callback(udpsubreq, dns_udp_call_loop, dns_udp_socket);
 
535
 
 
536
        return NT_STATUS_OK;
 
537
}
 
538
 
 
539
/*
 
540
  setup our listening sockets on the configured network interfaces
 
541
*/
 
542
static NTSTATUS dns_startup_interfaces(struct dns_server *dns, struct loadparm_context *lp_ctx,
 
543
                                       struct interface *ifaces)
 
544
{
 
545
        const struct model_ops *model_ops;
 
546
        int num_interfaces;
 
547
        TALLOC_CTX *tmp_ctx = talloc_new(dns);
 
548
        NTSTATUS status;
 
549
        int i;
 
550
 
 
551
        /* within the dns task we want to be a single process, so
 
552
           ask for the single process model ops and pass these to the
 
553
           stream_setup_socket() call. */
 
554
        model_ops = process_model_startup("single");
 
555
        if (!model_ops) {
 
556
                DEBUG(0,("Can't find 'single' process model_ops\n"));
 
557
                return NT_STATUS_INTERNAL_ERROR;
 
558
        }
 
559
 
 
560
        num_interfaces = iface_count(ifaces);
 
561
 
 
562
        for (i=0; i<num_interfaces; i++) {
 
563
                const char *address = talloc_strdup(tmp_ctx, iface_n_ip(ifaces, i));
 
564
 
 
565
                status = dns_add_socket(dns, model_ops, "dns", address, DNS_SERVICE_PORT);
 
566
                NT_STATUS_NOT_OK_RETURN(status);
 
567
        }
 
568
 
 
569
        talloc_free(tmp_ctx);
 
570
 
 
571
        return NT_STATUS_OK;
 
572
}
 
573
 
 
574
static int dns_server_sort_zones(struct ldb_message **m1, struct ldb_message **m2)
 
575
{
 
576
        const char *n1, *n2;
 
577
        size_t l1, l2;
 
578
 
 
579
        n1 = ldb_msg_find_attr_as_string(*m1, "name", NULL);
 
580
        n2 = ldb_msg_find_attr_as_string(*m2, "name", NULL);
 
581
 
 
582
        l1 = strlen(n1);
 
583
        l2 = strlen(n2);
 
584
 
 
585
        /* If the string lengths are not equal just sort by length */
 
586
        if (l1 != l2) {
 
587
                /* If m1 is the larger zone name, return it first */
 
588
                return l2 - l1;
 
589
        }
 
590
 
 
591
        /*TODO: We need to compare DNs here, we want the DomainDNSZones first */
 
592
        return 0;
 
593
}
 
594
 
 
595
static void dns_task_init(struct task_server *task)
 
596
{
 
597
        struct dns_server *dns;
 
598
        NTSTATUS status;
 
599
        struct interface *ifaces;
 
600
        int ret;
 
601
        struct ldb_result *res;
 
602
        struct ldb_dn *rootdn;
 
603
        static const char * const attrs[] = { "name", NULL};
 
604
        unsigned int i;
 
605
 
 
606
        switch (lpcfg_server_role(task->lp_ctx)) {
 
607
        case ROLE_STANDALONE:
 
608
                task_server_terminate(task, "dns: no DNS required in standalone configuration", false);
 
609
                return;
 
610
        case ROLE_DOMAIN_MEMBER:
 
611
                task_server_terminate(task, "dns: no DNS required in member server configuration", false);
 
612
                return;
 
613
        case ROLE_DOMAIN_CONTROLLER:
 
614
                /* Yes, we want a DNS */
 
615
                break;
 
616
        }
 
617
 
 
618
        load_interfaces(task, lpcfg_interfaces(task->lp_ctx), &ifaces);
 
619
 
 
620
        if (iface_count(ifaces) == 0) {
 
621
                task_server_terminate(task, "dns: no network interfaces configured", false);
 
622
                return;
 
623
        }
 
624
 
 
625
        task_server_set_title(task, "task[dns]");
 
626
 
 
627
        dns = talloc_zero(task, struct dns_server);
 
628
        if (dns == NULL) {
 
629
                task_server_terminate(task, "dns: out of memory", true);
 
630
                return;
 
631
        }
 
632
 
 
633
        dns->task = task;
 
634
 
 
635
        dns->samdb = samdb_connect(dns, dns->task->event_ctx, dns->task->lp_ctx,
 
636
                              system_session(dns->task->lp_ctx), 0);
 
637
        if (!dns->samdb) {
 
638
                task_server_terminate(task, "dns: samdb_connect failed", true);
 
639
                return;
 
640
        }
 
641
 
 
642
        rootdn = ldb_dn_new(dns, dns->samdb, "");
 
643
        if (rootdn == NULL) {
 
644
                task_server_terminate(task, "dns: out of memory", true);
 
645
                return;
 
646
        }
 
647
 
 
648
        // TODO: this search does not work against windows
 
649
        ret = dsdb_search(dns->samdb, dns, &res, rootdn, LDB_SCOPE_SUBTREE,
 
650
                          attrs, DSDB_SEARCH_SEARCH_ALL_PARTITIONS, "(objectClass=dnsZone)");
 
651
        if (ret != LDB_SUCCESS) {
 
652
                task_server_terminate(task,
 
653
                                      "dns: failed to look up root DNS zones",
 
654
                                      true);
 
655
                return;
 
656
        }
 
657
 
 
658
        TYPESAFE_QSORT(res->msgs, res->count, dns_server_sort_zones);
 
659
 
 
660
        for (i=0; i < res->count; i++) {
 
661
                struct dns_server_zone *z;
 
662
 
 
663
                z = talloc_zero(dns, struct dns_server_zone);
 
664
                if (z == NULL) {
 
665
                }
 
666
 
 
667
                z->name = ldb_msg_find_attr_as_string(res->msgs[i], "name", NULL);
 
668
                z->dn = talloc_move(z, &res->msgs[i]->dn);
 
669
 
 
670
                DLIST_ADD_END(dns->zones, z, NULL);
 
671
        }
 
672
 
 
673
        status = dns_startup_interfaces(dns, task->lp_ctx, ifaces);
 
674
        if (!NT_STATUS_IS_OK(status)) {
 
675
                task_server_terminate(task, "dns failed to setup interfaces", true);
 
676
                return;
 
677
        }
 
678
}
 
679
 
 
680
NTSTATUS server_service_dns_init(void)
 
681
{
 
682
        return register_server_service("dns", dns_task_init);
 
683
}