Use tevent_req_oom
[ira/wip.git] / source3 / libsmb / namequery.c
1 /*
2    Unix SMB/CIFS implementation.
3    name query routines
4    Copyright (C) Andrew Tridgell 1994-1998
5    Copyright (C) Jeremy Allison 2007.
6
7    This program is free software; you can redistribute it and/or modify
8    it under the terms of the GNU General Public License as published by
9    the Free Software Foundation; either version 3 of the License, or
10    (at your option) any later version.
11
12    This program is distributed in the hope that it will be useful,
13    but WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15    GNU General Public License for more details.
16
17    You should have received a copy of the GNU General Public License
18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22 #include "../lib/util/tevent_ntstatus.h"
23 #include "libads/sitename_cache.h"
24 #include "libads/dns.h"
25 #include "../libcli/netlogon/netlogon.h"
26 #include "lib/async_req/async_sock.h"
27 #include "libsmb/nmblib.h"
28
29 /* nmbd.c sets this to True. */
30 bool global_in_nmbd = False;
31
32 /****************************
33  * SERVER AFFINITY ROUTINES *
34  ****************************/
35
36  /* Server affinity is the concept of preferring the last domain
37     controller with whom you had a successful conversation */
38
39 /****************************************************************************
40 ****************************************************************************/
41 #define SAFKEY_FMT      "SAF/DOMAIN/%s"
42 #define SAF_TTL         900
43 #define SAFJOINKEY_FMT  "SAFJOIN/DOMAIN/%s"
44 #define SAFJOIN_TTL     3600
45
46 static char *saf_key(const char *domain)
47 {
48         char *keystr;
49
50         asprintf_strupper_m(&keystr, SAFKEY_FMT, domain);
51
52         return keystr;
53 }
54
55 static char *saf_join_key(const char *domain)
56 {
57         char *keystr;
58
59         asprintf_strupper_m(&keystr, SAFJOINKEY_FMT, domain);
60
61         return keystr;
62 }
63
64 /****************************************************************************
65 ****************************************************************************/
66
67 bool saf_store( const char *domain, const char *servername )
68 {
69         char *key;
70         time_t expire;
71         bool ret = False;
72
73         if ( !domain || !servername ) {
74                 DEBUG(2,("saf_store: "
75                         "Refusing to store empty domain or servername!\n"));
76                 return False;
77         }
78
79         if ( (strlen(domain) == 0) || (strlen(servername) == 0) ) {
80                 DEBUG(0,("saf_store: "
81                         "refusing to store 0 length domain or servername!\n"));
82                 return False;
83         }
84
85         key = saf_key( domain );
86         expire = time( NULL ) + lp_parm_int(-1, "saf","ttl", SAF_TTL);
87
88         DEBUG(10,("saf_store: domain = [%s], server = [%s], expire = [%u]\n",
89                 domain, servername, (unsigned int)expire ));
90
91         ret = gencache_set( key, servername, expire );
92
93         SAFE_FREE( key );
94
95         return ret;
96 }
97
98 bool saf_join_store( const char *domain, const char *servername )
99 {
100         char *key;
101         time_t expire;
102         bool ret = False;
103
104         if ( !domain || !servername ) {
105                 DEBUG(2,("saf_join_store: Refusing to store empty domain or servername!\n"));
106                 return False;
107         }
108
109         if ( (strlen(domain) == 0) || (strlen(servername) == 0) ) {
110                 DEBUG(0,("saf_join_store: refusing to store 0 length domain or servername!\n"));
111                 return False;
112         }
113
114         key = saf_join_key( domain );
115         expire = time( NULL ) + lp_parm_int(-1, "saf","join ttl", SAFJOIN_TTL);
116
117         DEBUG(10,("saf_join_store: domain = [%s], server = [%s], expire = [%u]\n",
118                 domain, servername, (unsigned int)expire ));
119
120         ret = gencache_set( key, servername, expire );
121
122         SAFE_FREE( key );
123
124         return ret;
125 }
126
127 bool saf_delete( const char *domain )
128 {
129         char *key;
130         bool ret = False;
131
132         if ( !domain ) {
133                 DEBUG(2,("saf_delete: Refusing to delete empty domain\n"));
134                 return False;
135         }
136
137         key = saf_join_key(domain);
138         ret = gencache_del(key);
139         SAFE_FREE(key);
140
141         if (ret) {
142                 DEBUG(10,("saf_delete[join]: domain = [%s]\n", domain ));
143         }
144
145         key = saf_key(domain);
146         ret = gencache_del(key);
147         SAFE_FREE(key);
148
149         if (ret) {
150                 DEBUG(10,("saf_delete: domain = [%s]\n", domain ));
151         }
152
153         return ret;
154 }
155
156 /****************************************************************************
157 ****************************************************************************/
158
159 char *saf_fetch( const char *domain )
160 {
161         char *server = NULL;
162         time_t timeout;
163         bool ret = False;
164         char *key = NULL;
165
166         if ( !domain || strlen(domain) == 0) {
167                 DEBUG(2,("saf_fetch: Empty domain name!\n"));
168                 return NULL;
169         }
170
171         key = saf_join_key( domain );
172
173         ret = gencache_get( key, &server, &timeout );
174
175         SAFE_FREE( key );
176
177         if ( ret ) {
178                 DEBUG(5,("saf_fetch[join]: Returning \"%s\" for \"%s\" domain\n",
179                         server, domain ));
180                 return server;
181         }
182
183         key = saf_key( domain );
184
185         ret = gencache_get( key, &server, &timeout );
186
187         SAFE_FREE( key );
188
189         if ( !ret ) {
190                 DEBUG(5,("saf_fetch: failed to find server for \"%s\" domain\n",
191                                         domain ));
192         } else {
193                 DEBUG(5,("saf_fetch: Returning \"%s\" for \"%s\" domain\n",
194                         server, domain ));
195         }
196
197         return server;
198 }
199
200 static void set_socket_addr_v4(struct sockaddr_storage *addr)
201 {
202         if (!interpret_string_addr(addr, lp_socket_address(),
203                                    AI_NUMERICHOST|AI_PASSIVE)) {
204                 zero_sockaddr(addr);
205         }
206         if (addr->ss_family != AF_INET) {
207                 zero_sockaddr(addr);
208         }
209 }
210
211 static struct in_addr my_socket_addr_v4(void)
212 {
213         struct sockaddr_storage my_addr;
214         struct sockaddr_in *in_addr = (struct sockaddr_in *)((char *)&my_addr);
215
216         set_socket_addr_v4(&my_addr);
217         return in_addr->sin_addr;
218 }
219
220 /****************************************************************************
221  Generate a random trn_id.
222 ****************************************************************************/
223
224 static int generate_trn_id(void)
225 {
226         uint16 id;
227
228         generate_random_buffer((uint8 *)&id, sizeof(id));
229
230         return id % (unsigned)0x7FFF;
231 }
232
233 /****************************************************************************
234  Parse a node status response into an array of structures.
235 ****************************************************************************/
236
237 static struct node_status *parse_node_status(TALLOC_CTX *mem_ctx, char *p,
238                                 int *num_names,
239                                 struct node_status_extra *extra)
240 {
241         struct node_status *ret;
242         int i;
243
244         *num_names = CVAL(p,0);
245
246         if (*num_names == 0)
247                 return NULL;
248
249         ret = talloc_array(mem_ctx, struct node_status,*num_names);
250         if (!ret)
251                 return NULL;
252
253         p++;
254         for (i=0;i< *num_names;i++) {
255                 StrnCpy(ret[i].name,p,15);
256                 trim_char(ret[i].name,'\0',' ');
257                 ret[i].type = CVAL(p,15);
258                 ret[i].flags = p[16];
259                 p += 18;
260                 DEBUG(10, ("%s#%02x: flags = 0x%02x\n", ret[i].name,
261                            ret[i].type, ret[i].flags));
262         }
263         /*
264          * Also, pick up the MAC address ...
265          */
266         if (extra) {
267                 memcpy(&extra->mac_addr, p, 6); /* Fill in the mac addr */
268         }
269         return ret;
270 }
271
272 struct sock_packet_read_state {
273         struct tevent_context *ev;
274         enum packet_type type;
275         int trn_id;
276
277         struct nb_packet_reader *reader;
278         struct tevent_req *reader_req;
279
280         int sock;
281         struct tevent_req *socket_req;
282         uint8_t buf[1024];
283         struct sockaddr_storage addr;
284         socklen_t addr_len;
285
286         bool (*validator)(struct packet_struct *p,
287                           void *private_data);
288         void *private_data;
289
290         struct packet_struct *packet;
291 };
292
293 static int sock_packet_read_state_destructor(struct sock_packet_read_state *s);
294 static void sock_packet_read_got_packet(struct tevent_req *subreq);
295 static void sock_packet_read_got_socket(struct tevent_req *subreq);
296
297 static struct tevent_req *sock_packet_read_send(
298         TALLOC_CTX *mem_ctx,
299         struct tevent_context *ev,
300         int sock, /* dgram socket */
301         struct nb_packet_reader *reader,
302         enum packet_type type,
303         int trn_id,
304         bool (*validator)(struct packet_struct *p, void *private_data),
305         void *private_data)
306 {
307         struct tevent_req *req;
308         struct sock_packet_read_state *state;
309
310         req = tevent_req_create(mem_ctx, &state,
311                                 struct sock_packet_read_state);
312         if (req == NULL) {
313                 return NULL;
314         }
315         talloc_set_destructor(state, sock_packet_read_state_destructor);
316         state->ev = ev;
317         state->reader = reader;
318         state->sock = sock;
319         state->type = type;
320         state->trn_id = trn_id;
321         state->validator = validator;
322         state->private_data = private_data;
323
324         if (reader != NULL) {
325                 state->reader_req = nb_packet_read_send(state, ev, reader);
326                 if (tevent_req_nomem(state->reader_req, req)) {
327                         return tevent_req_post(req, ev);
328                 }
329                 tevent_req_set_callback(
330                         state->reader_req, sock_packet_read_got_packet, req);
331         }
332
333         state->addr_len = sizeof(state->addr);
334         state->socket_req = recvfrom_send(state, ev, sock,
335                                           state->buf, sizeof(state->buf), 0,
336                                           &state->addr, &state->addr_len);
337         if (tevent_req_nomem(state->socket_req, req)) {
338                 return tevent_req_post(req, ev);
339         }
340         tevent_req_set_callback(state->socket_req, sock_packet_read_got_socket,
341                                 req);
342
343         return req;
344 }
345
346 static int sock_packet_read_state_destructor(struct sock_packet_read_state *s)
347 {
348         if (s->packet != NULL) {
349                 free_packet(s->packet);
350                 s->packet = NULL;
351         }
352         return 0;
353 }
354
355 static void sock_packet_read_got_packet(struct tevent_req *subreq)
356 {
357         struct tevent_req *req = tevent_req_callback_data(
358                 subreq, struct tevent_req);
359         struct sock_packet_read_state *state = tevent_req_data(
360                 req, struct sock_packet_read_state);
361         NTSTATUS status;
362
363         status = nb_packet_read_recv(subreq, &state->packet);
364
365         TALLOC_FREE(state->reader_req);
366
367         if (!NT_STATUS_IS_OK(status)) {
368                 if (state->socket_req != NULL) {
369                         /*
370                          * Still waiting for socket
371                          */
372                         return;
373                 }
374                 /*
375                  * Both socket and packet reader failed
376                  */
377                 tevent_req_nterror(req, status);
378                 return;
379         }
380
381         if ((state->validator != NULL) &&
382             !state->validator(state->packet, state->private_data)) {
383                 DEBUG(10, ("validator failed\n"));
384
385                 free_packet(state->packet);
386                 state->packet = NULL;
387
388                 state->reader_req = nb_packet_read_send(state, state->ev,
389                                                         state->reader);
390                 if (tevent_req_nomem(state->reader_req, req)) {
391                         return;
392                 }
393                 tevent_req_set_callback(
394                         state->reader_req, sock_packet_read_got_packet, req);
395                 return;
396         }
397
398         TALLOC_FREE(state->socket_req);
399         tevent_req_done(req);
400 }
401
402 static void sock_packet_read_got_socket(struct tevent_req *subreq)
403 {
404         struct tevent_req *req = tevent_req_callback_data(
405                 subreq, struct tevent_req);
406         struct sock_packet_read_state *state = tevent_req_data(
407                 req, struct sock_packet_read_state);
408         struct sockaddr_in *in_addr;
409         ssize_t received;
410         int err;
411
412         received = recvfrom_recv(subreq, &err);
413
414         TALLOC_FREE(state->socket_req);
415
416         if (received == -1) {
417                 if (state->reader_req != NULL) {
418                         /*
419                          * Still waiting for reader
420                          */
421                         return;
422                 }
423                 /*
424                  * Both socket and reader failed
425                  */
426                 tevent_req_nterror(req, map_nt_error_from_unix(err));
427                 return;
428         }
429         if (state->addr.ss_family != AF_INET) {
430                 goto retry;
431         }
432         in_addr = (struct sockaddr_in *)(void *)&state->addr;
433
434         state->packet = parse_packet((char *)state->buf, received, state->type,
435                                      in_addr->sin_addr, in_addr->sin_port);
436         if (state->packet == NULL) {
437                 DEBUG(10, ("parse_packet failed\n"));
438                 goto retry;
439         }
440         if ((state->trn_id != -1) &&
441             (state->trn_id != packet_trn_id(state->packet))) {
442                 DEBUG(10, ("Expected transaction id %d, got %d\n",
443                            state->trn_id, packet_trn_id(state->packet)));
444                 goto retry;
445         }
446
447         if ((state->validator != NULL) &&
448             !state->validator(state->packet, state->private_data)) {
449                 DEBUG(10, ("validator failed\n"));
450                 goto retry;
451         }
452
453         tevent_req_done(req);
454         return;
455
456 retry:
457         if (state->packet != NULL) {
458                 free_packet(state->packet);
459                 state->packet = NULL;
460         }
461         state->socket_req = recvfrom_send(state, state->ev, state->sock,
462                                           state->buf, sizeof(state->buf), 0,
463                                           &state->addr, &state->addr_len);
464         if (tevent_req_nomem(state->socket_req, req)) {
465                 return;
466         }
467         tevent_req_set_callback(state->socket_req, sock_packet_read_got_socket,
468                                 req);
469 }
470
471 static NTSTATUS sock_packet_read_recv(struct tevent_req *req,
472                                       struct packet_struct **ppacket)
473 {
474         struct sock_packet_read_state *state = tevent_req_data(
475                 req, struct sock_packet_read_state);
476         NTSTATUS status;
477
478         if (tevent_req_is_nterror(req, &status)) {
479                 return status;
480         }
481         *ppacket = state->packet;
482         state->packet = NULL;
483         return NT_STATUS_OK;
484 }
485
486 struct nb_trans_state {
487         struct tevent_context *ev;
488         int sock;
489         struct nb_packet_reader *reader;
490
491         const struct sockaddr_storage *dst_addr;
492         uint8_t *buf;
493         size_t buflen;
494         enum packet_type type;
495         int trn_id;
496
497         bool (*validator)(struct packet_struct *p,
498                           void *private_data);
499         void *private_data;
500
501         struct packet_struct *packet;
502 };
503
504 static int nb_trans_state_destructor(struct nb_trans_state *s);
505 static void nb_trans_got_reader(struct tevent_req *subreq);
506 static void nb_trans_done(struct tevent_req *subreq);
507 static void nb_trans_sent(struct tevent_req *subreq);
508 static void nb_trans_send_next(struct tevent_req *subreq);
509
510 static struct tevent_req *nb_trans_send(
511         TALLOC_CTX *mem_ctx,
512         struct tevent_context *ev,
513         const struct sockaddr_storage *my_addr,
514         const struct sockaddr_storage *dst_addr,
515         bool bcast,
516         uint8_t *buf, size_t buflen,
517         enum packet_type type, int trn_id,
518         bool (*validator)(struct packet_struct *p,
519                           void *private_data),
520         void *private_data)
521 {
522         struct tevent_req *req, *subreq;
523         struct nb_trans_state *state;
524
525         req = tevent_req_create(mem_ctx, &state, struct nb_trans_state);
526         if (req == NULL) {
527                 return NULL;
528         }
529         talloc_set_destructor(state, nb_trans_state_destructor);
530         state->ev = ev;
531         state->dst_addr = dst_addr;
532         state->buf = buf;
533         state->buflen = buflen;
534         state->type = type;
535         state->trn_id = trn_id;
536         state->validator = validator;
537         state->private_data = private_data;
538
539         state->sock = open_socket_in(SOCK_DGRAM, 0, 3, my_addr, True);
540         if (state->sock == -1) {
541                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
542                 DEBUG(10, ("open_socket_in failed: %s\n", strerror(errno)));
543                 return tevent_req_post(req, ev);
544         }
545
546         if (bcast) {
547                 set_socket_options(state->sock,"SO_BROADCAST");
548         }
549
550         subreq = nb_packet_reader_send(state, ev, type, state->trn_id, NULL);
551         if (tevent_req_nomem(subreq, req)) {
552                 return tevent_req_post(req, ev);
553         }
554         tevent_req_set_callback(subreq, nb_trans_got_reader, req);
555         return req;
556 }
557
558 static int nb_trans_state_destructor(struct nb_trans_state *s)
559 {
560         if (s->sock != -1) {
561                 close(s->sock);
562                 s->sock = -1;
563         }
564         if (s->packet != NULL) {
565                 free_packet(s->packet);
566                 s->packet = NULL;
567         }
568         return 0;
569 }
570
571 static void nb_trans_got_reader(struct tevent_req *subreq)
572 {
573         struct tevent_req *req = tevent_req_callback_data(
574                 subreq, struct tevent_req);
575         struct nb_trans_state *state = tevent_req_data(
576                 req, struct nb_trans_state);
577         NTSTATUS status;
578
579         status = nb_packet_reader_recv(subreq, state, &state->reader);
580         TALLOC_FREE(subreq);
581
582         if (!NT_STATUS_IS_OK(status)) {
583                 DEBUG(10, ("nmbd not around\n"));
584                 state->reader = NULL;
585         }
586
587         subreq = sock_packet_read_send(
588                 state, state->ev, state->sock,
589                 state->reader, state->type, state->trn_id,
590                 state->validator, state->private_data);
591         if (tevent_req_nomem(subreq, req)) {
592                 return;
593         }
594         tevent_req_set_callback(subreq, nb_trans_done, req);
595
596         subreq = sendto_send(state, state->ev, state->sock,
597                              state->buf, state->buflen, 0, state->dst_addr);
598         if (tevent_req_nomem(subreq, req)) {
599                 return;
600         }
601         tevent_req_set_callback(subreq, nb_trans_sent, req);
602 }
603
604 static void nb_trans_sent(struct tevent_req *subreq)
605 {
606         struct tevent_req *req = tevent_req_callback_data(
607                 subreq, struct tevent_req);
608         struct nb_trans_state *state = tevent_req_data(
609                 req, struct nb_trans_state);
610         ssize_t sent;
611         int err;
612
613         sent = sendto_recv(subreq, &err);
614         TALLOC_FREE(subreq);
615         if (sent == -1) {
616                 DEBUG(10, ("sendto failed: %s\n", strerror(err)));
617                 tevent_req_nterror(req, map_nt_error_from_unix(err));
618                 return;
619         }
620         subreq = tevent_wakeup_send(state, state->ev,
621                                     timeval_current_ofs(1, 0));
622         if (tevent_req_nomem(subreq, req)) {
623                 return;
624         }
625         tevent_req_set_callback(subreq, nb_trans_send_next, req);
626 }
627
628 static void nb_trans_send_next(struct tevent_req *subreq)
629 {
630         struct tevent_req *req = tevent_req_callback_data(
631                 subreq, struct tevent_req);
632         struct nb_trans_state *state = tevent_req_data(
633                 req, struct nb_trans_state);
634         bool ret;
635
636         ret = tevent_wakeup_recv(subreq);
637         TALLOC_FREE(subreq);
638         if (!ret) {
639                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
640                 return;
641         }
642         subreq = sendto_send(state, state->ev, state->sock,
643                              state->buf, state->buflen, 0, state->dst_addr);
644         if (tevent_req_nomem(subreq, req)) {
645                 return;
646         }
647         tevent_req_set_callback(subreq, nb_trans_sent, req);
648 }
649
650 static void nb_trans_done(struct tevent_req *subreq)
651 {
652         struct tevent_req *req = tevent_req_callback_data(
653                 subreq, struct tevent_req);
654         struct nb_trans_state *state = tevent_req_data(
655                 req, struct nb_trans_state);
656         NTSTATUS status;
657
658         status = sock_packet_read_recv(subreq, &state->packet);
659         TALLOC_FREE(subreq);
660         if (tevent_req_nterror(req, status)) {
661                 return;
662         }
663         tevent_req_done(req);
664 }
665
666 static NTSTATUS nb_trans_recv(struct tevent_req *req,
667                               struct packet_struct **ppacket)
668 {
669         struct nb_trans_state *state = tevent_req_data(
670                 req, struct nb_trans_state);
671         NTSTATUS status;
672
673         if (tevent_req_is_nterror(req, &status)) {
674                 return status;
675         }
676         *ppacket = state->packet;
677         state->packet = NULL;
678         return NT_STATUS_OK;
679 }
680
681 /****************************************************************************
682  Do a NBT node status query on an open socket and return an array of
683  structures holding the returned names or NULL if the query failed.
684 **************************************************************************/
685
686 struct node_status_query_state {
687         struct sockaddr_storage my_addr;
688         struct sockaddr_storage addr;
689         uint8_t buf[1024];
690         ssize_t buflen;
691         struct packet_struct *packet;
692 };
693
694 static int node_status_query_state_destructor(
695         struct node_status_query_state *s);
696 static bool node_status_query_validator(struct packet_struct *p,
697                                         void *private_data);
698 static void node_status_query_done(struct tevent_req *subreq);
699
700 struct tevent_req *node_status_query_send(TALLOC_CTX *mem_ctx,
701                                           struct tevent_context *ev,
702                                           struct nmb_name *name,
703                                           const struct sockaddr_storage *addr)
704 {
705         struct tevent_req *req, *subreq;
706         struct node_status_query_state *state;
707         struct packet_struct p;
708         struct nmb_packet *nmb = &p.packet.nmb;
709         struct sockaddr_in *in_addr;
710
711         req = tevent_req_create(mem_ctx, &state,
712                                 struct node_status_query_state);
713         if (req == NULL) {
714                 return NULL;
715         }
716         talloc_set_destructor(state, node_status_query_state_destructor);
717
718         if (addr->ss_family != AF_INET) {
719                 /* Can't do node status to IPv6 */
720                 tevent_req_nterror(req, NT_STATUS_INVALID_ADDRESS);
721                 return tevent_req_post(req, ev);
722         }
723
724         state->addr = *addr;
725         in_addr = (struct sockaddr_in *)(void *)&state->addr;
726         in_addr->sin_port = htons(NMB_PORT);
727
728         set_socket_addr_v4(&state->my_addr);
729
730         ZERO_STRUCT(p);
731         nmb->header.name_trn_id = generate_trn_id();
732         nmb->header.opcode = 0;
733         nmb->header.response = false;
734         nmb->header.nm_flags.bcast = false;
735         nmb->header.nm_flags.recursion_available = false;
736         nmb->header.nm_flags.recursion_desired = false;
737         nmb->header.nm_flags.trunc = false;
738         nmb->header.nm_flags.authoritative = false;
739         nmb->header.rcode = 0;
740         nmb->header.qdcount = 1;
741         nmb->header.ancount = 0;
742         nmb->header.nscount = 0;
743         nmb->header.arcount = 0;
744         nmb->question.question_name = *name;
745         nmb->question.question_type = 0x21;
746         nmb->question.question_class = 0x1;
747
748         state->buflen = build_packet((char *)state->buf, sizeof(state->buf),
749                                      &p);
750         if (state->buflen == 0) {
751                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
752                 DEBUG(10, ("build_packet failed\n"));
753                 return tevent_req_post(req, ev);
754         }
755
756         subreq = nb_trans_send(state, ev, &state->my_addr, &state->addr, false,
757                                state->buf, state->buflen,
758                                NMB_PACKET, nmb->header.name_trn_id,
759                                node_status_query_validator, NULL);
760         if (tevent_req_nomem(subreq, req)) {
761                 DEBUG(10, ("nb_trans_send failed\n"));
762                 return tevent_req_post(req, ev);
763         }
764         if (!tevent_req_set_endtime(req, ev, timeval_current_ofs(10, 0))) {
765                 return tevent_req_post(req, ev);
766         }
767         tevent_req_set_callback(subreq, node_status_query_done, req);
768         return req;
769 }
770
771 static bool node_status_query_validator(struct packet_struct *p,
772                                         void *private_data)
773 {
774         struct nmb_packet *nmb = &p->packet.nmb;
775         debug_nmb_packet(p);
776
777         if (nmb->header.opcode != 0 ||
778             nmb->header.nm_flags.bcast ||
779             nmb->header.rcode ||
780             !nmb->header.ancount ||
781             nmb->answers->rr_type != 0x21) {
782                 /*
783                  * XXXX what do we do with this? could be a redirect,
784                  * but we'll discard it for the moment
785                  */
786                 return false;
787         }
788         return true;
789 }
790
791 static int node_status_query_state_destructor(
792         struct node_status_query_state *s)
793 {
794         if (s->packet != NULL) {
795                 free_packet(s->packet);
796                 s->packet = NULL;
797         }
798         return 0;
799 }
800
801 static void node_status_query_done(struct tevent_req *subreq)
802 {
803         struct tevent_req *req = tevent_req_callback_data(
804                 subreq, struct tevent_req);
805         struct node_status_query_state *state = tevent_req_data(
806                 req, struct node_status_query_state);
807         NTSTATUS status;
808
809         status = nb_trans_recv(subreq, &state->packet);
810         TALLOC_FREE(subreq);
811         if (tevent_req_nterror(req, status)) {
812                 return;
813         }
814         tevent_req_done(req);
815 }
816
817 NTSTATUS node_status_query_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
818                                 struct node_status **pnode_status,
819                                 int *pnum_names,
820                                 struct node_status_extra *extra)
821 {
822         struct node_status_query_state *state = tevent_req_data(
823                 req, struct node_status_query_state);
824         struct node_status *node_status;
825         int num_names;
826         NTSTATUS status;
827
828         if (tevent_req_is_nterror(req, &status)) {
829                 return status;
830         }
831         node_status = parse_node_status(
832                 mem_ctx, &state->packet->packet.nmb.answers->rdata[0],
833                 &num_names, extra);
834         if (node_status == NULL) {
835                 return NT_STATUS_NO_MEMORY;
836         }
837         *pnode_status = node_status;
838         *pnum_names = num_names;
839         return NT_STATUS_OK;
840 }
841
842 NTSTATUS node_status_query(TALLOC_CTX *mem_ctx, struct nmb_name *name,
843                            const struct sockaddr_storage *addr,
844                            struct node_status **pnode_status,
845                            int *pnum_names,
846                            struct node_status_extra *extra)
847 {
848         TALLOC_CTX *frame = talloc_stackframe();
849         struct tevent_context *ev;
850         struct tevent_req *req;
851         NTSTATUS status = NT_STATUS_NO_MEMORY;
852
853         ev = tevent_context_init(frame);
854         if (ev == NULL) {
855                 goto fail;
856         }
857         req = node_status_query_send(ev, ev, name, addr);
858         if (req == NULL) {
859                 goto fail;
860         }
861         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
862                 goto fail;
863         }
864         status = node_status_query_recv(req, mem_ctx, pnode_status,
865                                         pnum_names, extra);
866  fail:
867         TALLOC_FREE(frame);
868         return status;
869 }
870
871 /****************************************************************************
872  Find the first type XX name in a node status reply - used for finding
873  a servers name given its IP. Return the matched name in *name.
874 **************************************************************************/
875
876 bool name_status_find(const char *q_name,
877                         int q_type,
878                         int type,
879                         const struct sockaddr_storage *to_ss,
880                         fstring name)
881 {
882         char addr[INET6_ADDRSTRLEN];
883         struct sockaddr_storage ss;
884         struct node_status *addrs = NULL;
885         struct nmb_name nname;
886         int count, i;
887         bool result = false;
888         NTSTATUS status;
889
890         if (lp_disable_netbios()) {
891                 DEBUG(5,("name_status_find(%s#%02x): netbios is disabled\n",
892                                         q_name, q_type));
893                 return False;
894         }
895
896         print_sockaddr(addr, sizeof(addr), to_ss);
897
898         DEBUG(10, ("name_status_find: looking up %s#%02x at %s\n", q_name,
899                    q_type, addr));
900
901         /* Check the cache first. */
902
903         if (namecache_status_fetch(q_name, q_type, type, to_ss, name)) {
904                 return True;
905         }
906
907         if (to_ss->ss_family != AF_INET) {
908                 /* Can't do node status to IPv6 */
909                 return false;
910         }
911
912         set_socket_addr_v4(&ss);
913
914         /* W2K PDC's seem not to respond to '*'#0. JRA */
915         make_nmb_name(&nname, q_name, q_type);
916         status = node_status_query(talloc_tos(), &nname, to_ss,
917                                    &addrs, &count, NULL);
918         if (!NT_STATUS_IS_OK(status)) {
919                 goto done;
920         }
921
922         for (i=0;i<count;i++) {
923                 /* Find first one of the requested type that's not a GROUP. */
924                 if (addrs[i].type == type && ! (addrs[i].flags & 0x80))
925                         break;
926         }
927         if (i == count)
928                 goto done;
929
930         pull_ascii_nstring(name, sizeof(fstring), addrs[i].name);
931
932         /* Store the result in the cache. */
933         /* but don't store an entry for 0x1c names here.  Here we have
934            a single host and DOMAIN<0x1c> names should be a list of hosts */
935
936         if ( q_type != 0x1c ) {
937                 namecache_status_store(q_name, q_type, type, to_ss, name);
938         }
939
940         result = true;
941
942  done:
943         TALLOC_FREE(addrs);
944
945         DEBUG(10, ("name_status_find: name %sfound", result ? "" : "not "));
946
947         if (result)
948                 DEBUGADD(10, (", name %s ip address is %s", name, addr));
949
950         DEBUG(10, ("\n"));
951
952         return result;
953 }
954
955 /*
956   comparison function used by sort_addr_list
957 */
958
959 static int addr_compare(const struct sockaddr_storage *ss1,
960                         const struct sockaddr_storage *ss2)
961 {
962         int max_bits1=0, max_bits2=0;
963         int num_interfaces = iface_count();
964         int i;
965
966         /* Sort IPv4 addresses first. */
967         if (ss1->ss_family != ss2->ss_family) {
968                 if (ss2->ss_family == AF_INET) {
969                         return 1;
970                 } else {
971                         return -1;
972                 }
973         }
974
975         /* Here we know both addresses are of the same
976          * family. */
977
978         for (i=0;i<num_interfaces;i++) {
979                 const struct sockaddr_storage *pss = iface_n_bcast(i);
980                 const unsigned char *p_ss1 = NULL;
981                 const unsigned char *p_ss2 = NULL;
982                 const unsigned char *p_if = NULL;
983                 size_t len = 0;
984                 int bits1, bits2;
985
986                 if (pss->ss_family != ss1->ss_family) {
987                         /* Ignore interfaces of the wrong type. */
988                         continue;
989                 }
990                 if (pss->ss_family == AF_INET) {
991                         p_if = (const unsigned char *)
992                                 &((const struct sockaddr_in *)pss)->sin_addr;
993                         p_ss1 = (const unsigned char *)
994                                 &((const struct sockaddr_in *)ss1)->sin_addr;
995                         p_ss2 = (const unsigned char *)
996                                 &((const struct sockaddr_in *)ss2)->sin_addr;
997                         len = 4;
998                 }
999 #if defined(HAVE_IPV6)
1000                 if (pss->ss_family == AF_INET6) {
1001                         p_if = (const unsigned char *)
1002                                 &((const struct sockaddr_in6 *)pss)->sin6_addr;
1003                         p_ss1 = (const unsigned char *)
1004                                 &((const struct sockaddr_in6 *)ss1)->sin6_addr;
1005                         p_ss2 = (const unsigned char *)
1006                                 &((const struct sockaddr_in6 *)ss2)->sin6_addr;
1007                         len = 16;
1008                 }
1009 #endif
1010                 if (!p_ss1 || !p_ss2 || !p_if || len == 0) {
1011                         continue;
1012                 }
1013                 bits1 = matching_len_bits(p_ss1, p_if, len);
1014                 bits2 = matching_len_bits(p_ss2, p_if, len);
1015                 max_bits1 = MAX(bits1, max_bits1);
1016                 max_bits2 = MAX(bits2, max_bits2);
1017         }
1018
1019         /* Bias towards directly reachable IPs */
1020         if (iface_local((const struct sockaddr *)ss1)) {
1021                 if (ss1->ss_family == AF_INET) {
1022                         max_bits1 += 32;
1023                 } else {
1024                         max_bits1 += 128;
1025                 }
1026         }
1027         if (iface_local((const struct sockaddr *)ss2)) {
1028                 if (ss2->ss_family == AF_INET) {
1029                         max_bits2 += 32;
1030                 } else {
1031                         max_bits2 += 128;
1032                 }
1033         }
1034         return max_bits2 - max_bits1;
1035 }
1036
1037 /*******************************************************************
1038  compare 2 ldap IPs by nearness to our interfaces - used in qsort
1039 *******************************************************************/
1040
1041 int ip_service_compare(struct ip_service *ss1, struct ip_service *ss2)
1042 {
1043         int result;
1044
1045         if ((result = addr_compare(&ss1->ss, &ss2->ss)) != 0) {
1046                 return result;
1047         }
1048
1049         if (ss1->port > ss2->port) {
1050                 return 1;
1051         }
1052
1053         if (ss1->port < ss2->port) {
1054                 return -1;
1055         }
1056
1057         return 0;
1058 }
1059
1060 /*
1061   sort an IP list so that names that are close to one of our interfaces
1062   are at the top. This prevents the problem where a WINS server returns an IP
1063   that is not reachable from our subnet as the first match
1064 */
1065
1066 static void sort_addr_list(struct sockaddr_storage *sslist, int count)
1067 {
1068         if (count <= 1) {
1069                 return;
1070         }
1071
1072         TYPESAFE_QSORT(sslist, count, addr_compare);
1073 }
1074
1075 static void sort_service_list(struct ip_service *servlist, int count)
1076 {
1077         if (count <= 1) {
1078                 return;
1079         }
1080
1081         TYPESAFE_QSORT(servlist, count, ip_service_compare);
1082 }
1083
1084 /**********************************************************************
1085  Remove any duplicate address/port pairs in the list
1086  *********************************************************************/
1087
1088 static int remove_duplicate_addrs2(struct ip_service *iplist, int count )
1089 {
1090         int i, j;
1091
1092         DEBUG(10,("remove_duplicate_addrs2: "
1093                         "looking for duplicate address/port pairs\n"));
1094
1095         /* one loop to remove duplicates */
1096         for ( i=0; i<count; i++ ) {
1097                 if ( is_zero_addr(&iplist[i].ss)) {
1098                         continue;
1099                 }
1100
1101                 for ( j=i+1; j<count; j++ ) {
1102                         if (sockaddr_equal((struct sockaddr *)(void *)&iplist[i].ss,
1103                                            (struct sockaddr *)(void *)&iplist[j].ss) &&
1104                                         iplist[i].port == iplist[j].port) {
1105                                 zero_sockaddr(&iplist[j].ss);
1106                         }
1107                 }
1108         }
1109
1110         /* one loop to clean up any holes we left */
1111         /* first ip should never be a zero_ip() */
1112         for (i = 0; i<count; ) {
1113                 if (is_zero_addr(&iplist[i].ss) ) {
1114                         if (i != count-1) {
1115                                 memmove(&iplist[i], &iplist[i+1],
1116                                         (count - i - 1)*sizeof(iplist[i]));
1117                         }
1118                         count--;
1119                         continue;
1120                 }
1121                 i++;
1122         }
1123
1124         return count;
1125 }
1126
1127 static bool prioritize_ipv4_list(struct ip_service *iplist, int count)
1128 {
1129         TALLOC_CTX *frame = talloc_stackframe();
1130         struct ip_service *iplist_new = talloc_array(frame, struct ip_service, count);
1131         int i, j;
1132
1133         if (iplist_new == NULL) {
1134                 TALLOC_FREE(frame);
1135                 return false;
1136         }
1137
1138         j = 0;
1139
1140         /* Copy IPv4 first. */
1141         for (i = 0; i < count; i++) {
1142                 if (iplist[i].ss.ss_family == AF_INET) {
1143                         iplist_new[j++] = iplist[i];
1144                 }
1145         }
1146
1147         /* Copy IPv6. */
1148         for (i = 0; i < count; i++) {
1149                 if (iplist[i].ss.ss_family != AF_INET) {
1150                         iplist_new[j++] = iplist[i];
1151                 }
1152         }
1153
1154         memcpy(iplist, iplist_new, sizeof(struct ip_service)*count);
1155         TALLOC_FREE(frame);
1156         return true;
1157 }
1158
1159 /****************************************************************************
1160  Do a netbios name query to find someones IP.
1161  Returns an array of IP addresses or NULL if none.
1162  *count will be set to the number of addresses returned.
1163  *timed_out is set if we failed by timing out
1164 ****************************************************************************/
1165
1166 struct name_query_state {
1167         struct sockaddr_storage my_addr;
1168         struct sockaddr_storage addr;
1169         bool bcast;
1170
1171
1172         uint8_t buf[1024];
1173         ssize_t buflen;
1174
1175         NTSTATUS validate_error;
1176         uint8_t flags;
1177
1178         struct sockaddr_storage *addrs;
1179         int num_addrs;
1180 };
1181
1182 static bool name_query_validator(struct packet_struct *p, void *private_data);
1183 static void name_query_done(struct tevent_req *subreq);
1184
1185 struct tevent_req *name_query_send(TALLOC_CTX *mem_ctx,
1186                                    struct tevent_context *ev,
1187                                    const char *name, int name_type,
1188                                    bool bcast, bool recurse,
1189                                    const struct sockaddr_storage *addr)
1190 {
1191         struct tevent_req *req, *subreq;
1192         struct name_query_state *state;
1193         struct packet_struct p;
1194         struct nmb_packet *nmb = &p.packet.nmb;
1195         struct sockaddr_in *in_addr;
1196
1197         req = tevent_req_create(mem_ctx, &state, struct name_query_state);
1198         if (req == NULL) {
1199                 return NULL;
1200         }
1201         state->bcast = bcast;
1202
1203         if (addr->ss_family != AF_INET) {
1204                 /* Can't do node status to IPv6 */
1205                 tevent_req_nterror(req, NT_STATUS_INVALID_ADDRESS);
1206                 return tevent_req_post(req, ev);
1207         }
1208
1209         if (lp_disable_netbios()) {
1210                 DEBUG(5,("name_query(%s#%02x): netbios is disabled\n",
1211                                         name, name_type));
1212                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
1213                 return tevent_req_post(req, ev);
1214         }
1215
1216         state->addr = *addr;
1217         in_addr = (struct sockaddr_in *)(void *)&state->addr;
1218         in_addr->sin_port = htons(NMB_PORT);
1219
1220         set_socket_addr_v4(&state->my_addr);
1221
1222         ZERO_STRUCT(p);
1223         nmb->header.name_trn_id = generate_trn_id();
1224         nmb->header.opcode = 0;
1225         nmb->header.response = false;
1226         nmb->header.nm_flags.bcast = bcast;
1227         nmb->header.nm_flags.recursion_available = false;
1228         nmb->header.nm_flags.recursion_desired = recurse;
1229         nmb->header.nm_flags.trunc = false;
1230         nmb->header.nm_flags.authoritative = false;
1231         nmb->header.rcode = 0;
1232         nmb->header.qdcount = 1;
1233         nmb->header.ancount = 0;
1234         nmb->header.nscount = 0;
1235         nmb->header.arcount = 0;
1236
1237         make_nmb_name(&nmb->question.question_name,name,name_type);
1238
1239         nmb->question.question_type = 0x20;
1240         nmb->question.question_class = 0x1;
1241
1242         state->buflen = build_packet((char *)state->buf, sizeof(state->buf),
1243                                      &p);
1244         if (state->buflen == 0) {
1245                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1246                 DEBUG(10, ("build_packet failed\n"));
1247                 return tevent_req_post(req, ev);
1248         }
1249
1250         subreq = nb_trans_send(state, ev, &state->my_addr, &state->addr, bcast,
1251                                state->buf, state->buflen,
1252                                NMB_PACKET, nmb->header.name_trn_id,
1253                                name_query_validator, state);
1254         if (tevent_req_nomem(subreq, req)) {
1255                 DEBUG(10, ("nb_trans_send failed\n"));
1256                 return tevent_req_post(req, ev);
1257         }
1258         tevent_req_set_callback(subreq, name_query_done, req);
1259         return req;
1260 }
1261
1262 static bool name_query_validator(struct packet_struct *p, void *private_data)
1263 {
1264         struct name_query_state *state = talloc_get_type_abort(
1265                 private_data, struct name_query_state);
1266         struct nmb_packet *nmb = &p->packet.nmb;
1267         struct sockaddr_storage *tmp_addrs;
1268         bool got_unique_netbios_name = false;
1269         int i;
1270
1271         debug_nmb_packet(p);
1272
1273         /*
1274          * If we get a Negative Name Query Response from a WINS
1275          * server, we should report it and give up.
1276          */
1277         if( 0 == nmb->header.opcode     /* A query response   */
1278             && !state->bcast            /* from a WINS server */
1279             && nmb->header.rcode        /* Error returned     */
1280                 ) {
1281
1282                 if( DEBUGLVL( 3 ) ) {
1283                         /* Only executed if DEBUGLEVEL >= 3 */
1284                         dbgtext( "Negative name query "
1285                                  "response, rcode 0x%02x: ",
1286                                  nmb->header.rcode );
1287                         switch( nmb->header.rcode ) {
1288                         case 0x01:
1289                                 dbgtext("Request was invalidly formatted.\n");
1290                                 break;
1291                         case 0x02:
1292                                 dbgtext("Problem with NBNS, cannot process "
1293                                         "name.\n");
1294                                 break;
1295                         case 0x03:
1296                                 dbgtext("The name requested does not "
1297                                         "exist.\n");
1298                                 break;
1299                         case 0x04:
1300                                 dbgtext("Unsupported request error.\n");
1301                                 break;
1302                         case 0x05:
1303                                 dbgtext("Query refused error.\n");
1304                                 break;
1305                         default:
1306                                 dbgtext("Unrecognized error code.\n" );
1307                                 break;
1308                         }
1309                 }
1310
1311                 /*
1312                  * We accept this packet as valid, but tell the upper
1313                  * layers that it's a negative response.
1314                  */
1315                 state->validate_error = NT_STATUS_NOT_FOUND;
1316                 return true;
1317         }
1318
1319         if (nmb->header.opcode != 0 ||
1320             nmb->header.nm_flags.bcast ||
1321             nmb->header.rcode ||
1322             !nmb->header.ancount) {
1323                 /*
1324                  * XXXX what do we do with this? Could be a redirect,
1325                  * but we'll discard it for the moment.
1326                  */
1327                 return false;
1328         }
1329
1330         tmp_addrs = talloc_realloc(
1331                 state, state->addrs, struct sockaddr_storage,
1332                 state->num_addrs + nmb->answers->rdlength/6);
1333         if (tmp_addrs == NULL) {
1334                 state->validate_error = NT_STATUS_NO_MEMORY;
1335                 return true;
1336         }
1337         state->addrs = tmp_addrs;
1338
1339         DEBUG(2,("Got a positive name query response "
1340                  "from %s ( ", inet_ntoa(p->ip)));
1341
1342         for (i=0; i<nmb->answers->rdlength/6; i++) {
1343                 uint16_t flags;
1344                 struct in_addr ip;
1345                 struct sockaddr_storage addr;
1346                 int j;
1347
1348                 flags = RSVAL(&nmb->answers->rdata[i*6], 0);
1349                 got_unique_netbios_name |= ((flags & 0x8000) == 0);
1350
1351                 putip((char *)&ip,&nmb->answers->rdata[2+i*6]);
1352                 in_addr_to_sockaddr_storage(&addr, ip);
1353
1354                 for (j=0; j<state->num_addrs; j++) {
1355                         if (sockaddr_equal(
1356                                     (struct sockaddr *)(void *)&addr,
1357                                     (struct sockaddr *)(void *)&state->addrs[j])) {
1358                                 break;
1359                         }
1360                 }
1361                 if (j < state->num_addrs) {
1362                         /* Already got it */
1363                         continue;
1364                 }
1365
1366                 DEBUGADD(2,("%s ",inet_ntoa(ip)));
1367
1368                 state->addrs[state->num_addrs] = addr;
1369                 state->num_addrs += 1;
1370         }
1371         DEBUGADD(2,(")\n"));
1372
1373         /* We add the flags back ... */
1374         if (nmb->header.response)
1375                 state->flags |= NM_FLAGS_RS;
1376         if (nmb->header.nm_flags.authoritative)
1377                 state->flags |= NM_FLAGS_AA;
1378         if (nmb->header.nm_flags.trunc)
1379                 state->flags |= NM_FLAGS_TC;
1380         if (nmb->header.nm_flags.recursion_desired)
1381                 state->flags |= NM_FLAGS_RD;
1382         if (nmb->header.nm_flags.recursion_available)
1383                 state->flags |= NM_FLAGS_RA;
1384         if (nmb->header.nm_flags.bcast)
1385                 state->flags |= NM_FLAGS_B;
1386
1387         if (state->bcast) {
1388                 /*
1389                  * We have to collect all entries coming in from broadcast
1390                  * queries. If we got a unique name, we're done.
1391                  */
1392                 return got_unique_netbios_name;
1393         }
1394         /*
1395          * WINS responses are accepted when they are received
1396          */
1397         return true;
1398 }
1399
1400 static void name_query_done(struct tevent_req *subreq)
1401 {
1402         struct tevent_req *req = tevent_req_callback_data(
1403                 subreq, struct tevent_req);
1404         struct name_query_state *state = tevent_req_data(
1405                 req, struct name_query_state);
1406         NTSTATUS status;
1407         struct packet_struct *p = NULL;
1408
1409         status = nb_trans_recv(subreq, &p);
1410         TALLOC_FREE(subreq);
1411         if (tevent_req_nterror(req, status)) {
1412                 return;
1413         }
1414         if (!NT_STATUS_IS_OK(state->validate_error)) {
1415                 tevent_req_nterror(req, state->validate_error);
1416                 return;
1417         }
1418         if (p != NULL) {
1419                 /*
1420                  * Free the packet here, we've collected the response in the
1421                  * validator
1422                  */
1423                 free_packet(p);
1424         }
1425         tevent_req_done(req);
1426 }
1427
1428 NTSTATUS name_query_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
1429                          struct sockaddr_storage **addrs, int *num_addrs,
1430                          uint8_t *flags)
1431 {
1432         struct name_query_state *state = tevent_req_data(
1433                 req, struct name_query_state);
1434         NTSTATUS status;
1435
1436         if (tevent_req_is_nterror(req, &status)) {
1437                 if (state->bcast &&
1438                     NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
1439                         /*
1440                          * In the broadcast case we collect replies until the
1441                          * timeout.
1442                          */
1443                         status = NT_STATUS_OK;
1444                 }
1445                 if (!NT_STATUS_IS_OK(status)) {
1446                         return status;
1447                 }
1448         }
1449         if (state->num_addrs == 0) {
1450                 return NT_STATUS_NOT_FOUND;
1451         }
1452         *addrs = talloc_move(mem_ctx, &state->addrs);
1453         sort_addr_list(*addrs, state->num_addrs);
1454         *num_addrs = state->num_addrs;
1455         if (flags != NULL) {
1456                 *flags = state->flags;
1457         }
1458         return NT_STATUS_OK;
1459 }
1460
1461 NTSTATUS name_query(const char *name, int name_type,
1462                     bool bcast, bool recurse,
1463                     const struct sockaddr_storage *to_ss,
1464                     TALLOC_CTX *mem_ctx,
1465                     struct sockaddr_storage **addrs,
1466                     int *num_addrs, uint8_t *flags)
1467 {
1468         TALLOC_CTX *frame = talloc_stackframe();
1469         struct tevent_context *ev;
1470         struct tevent_req *req;
1471         struct timeval timeout;
1472         NTSTATUS status = NT_STATUS_NO_MEMORY;
1473
1474         ev = tevent_context_init(frame);
1475         if (ev == NULL) {
1476                 goto fail;
1477         }
1478         req = name_query_send(ev, ev, name, name_type, bcast, recurse, to_ss);
1479         if (req == NULL) {
1480                 goto fail;
1481         }
1482         if (bcast) {
1483                 timeout = timeval_current_ofs(0, 250000);
1484         } else {
1485                 timeout = timeval_current_ofs(2, 0);
1486         }
1487         if (!tevent_req_set_endtime(req, ev, timeout)) {
1488                 goto fail;
1489         }
1490         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
1491                 goto fail;
1492         }
1493         status = name_query_recv(req, mem_ctx, addrs, num_addrs, flags);
1494  fail:
1495         TALLOC_FREE(frame);
1496         return status;
1497 }
1498
1499 /********************************************************
1500  convert an array if struct sockaddr_storage to struct ip_service
1501  return false on failure.  Port is set to PORT_NONE;
1502 *********************************************************/
1503
1504 static bool convert_ss2service(struct ip_service **return_iplist,
1505                 const struct sockaddr_storage *ss_list,
1506                 int count)
1507 {
1508         int i;
1509
1510         if ( count==0 || !ss_list )
1511                 return False;
1512
1513         /* copy the ip address; port will be PORT_NONE */
1514         if ((*return_iplist = SMB_MALLOC_ARRAY(struct ip_service, count)) ==
1515                         NULL) {
1516                 DEBUG(0,("convert_ip2service: malloc failed "
1517                         "for %d enetries!\n", count ));
1518                 return False;
1519         }
1520
1521         for ( i=0; i<count; i++ ) {
1522                 (*return_iplist)[i].ss   = ss_list[i];
1523                 (*return_iplist)[i].port = PORT_NONE;
1524         }
1525
1526         return true;
1527 }
1528
1529 struct name_queries_state {
1530         struct tevent_context *ev;
1531         const char *name;
1532         int name_type;
1533         bool bcast;
1534         bool recurse;
1535         const struct sockaddr_storage *addrs;
1536         int num_addrs;
1537         int wait_msec;
1538         int timeout_msec;
1539
1540         struct tevent_req **subreqs;
1541         int num_received;
1542         int num_sent;
1543
1544         int received_index;
1545         struct sockaddr_storage *result_addrs;
1546         int num_result_addrs;
1547         uint8_t flags;
1548 };
1549
1550 static void name_queries_done(struct tevent_req *subreq);
1551 static void name_queries_next(struct tevent_req *subreq);
1552
1553 /*
1554  * Send a name query to multiple destinations with a wait time in between
1555  */
1556
1557 static struct tevent_req *name_queries_send(
1558         TALLOC_CTX *mem_ctx, struct tevent_context *ev,
1559         const char *name, int name_type,
1560         bool bcast, bool recurse,
1561         const struct sockaddr_storage *addrs,
1562         int num_addrs, int wait_msec, int timeout_msec)
1563 {
1564         struct tevent_req *req, *subreq;
1565         struct name_queries_state *state;
1566
1567         req = tevent_req_create(mem_ctx, &state,
1568                                 struct name_queries_state);
1569         if (req == NULL) {
1570                 return NULL;
1571         }
1572         state->ev = ev;
1573         state->name = name;
1574         state->name_type = name_type;
1575         state->bcast = bcast;
1576         state->recurse = recurse;
1577         state->addrs = addrs;
1578         state->num_addrs = num_addrs;
1579         state->wait_msec = wait_msec;
1580         state->timeout_msec = timeout_msec;
1581
1582         state->subreqs = talloc_zero_array(
1583                 state, struct tevent_req *, num_addrs);
1584         if (tevent_req_nomem(state->subreqs, req)) {
1585                 return tevent_req_post(req, ev);
1586         }
1587         state->num_sent = 0;
1588
1589         subreq = name_query_send(
1590                 state->subreqs, state->ev, name, name_type, bcast, recurse,
1591                 &state->addrs[state->num_sent]);
1592         if (tevent_req_nomem(subreq, req)) {
1593                 return tevent_req_post(req, ev);
1594         }
1595         if (!tevent_req_set_endtime(
1596                     subreq, state->ev,
1597                     timeval_current_ofs(0, state->timeout_msec * 1000))) {
1598                 tevent_req_oom(req);
1599                 return tevent_req_post(req, ev);
1600         }
1601         tevent_req_set_callback(subreq, name_queries_done, req);
1602
1603         state->subreqs[state->num_sent] = subreq;
1604         state->num_sent += 1;
1605
1606         if (state->num_sent < state->num_addrs) {
1607                 subreq = tevent_wakeup_send(
1608                         state, state->ev,
1609                         timeval_current_ofs(0, state->wait_msec * 1000));
1610                 if (tevent_req_nomem(subreq, req)) {
1611                         return tevent_req_post(req, ev);
1612                 }
1613                 tevent_req_set_callback(subreq, name_queries_next, req);
1614         }
1615         return req;
1616 }
1617
1618 static void name_queries_done(struct tevent_req *subreq)
1619 {
1620         struct tevent_req *req = tevent_req_callback_data(
1621                 subreq, struct tevent_req);
1622         struct name_queries_state *state = tevent_req_data(
1623                 req, struct name_queries_state);
1624         int i;
1625         NTSTATUS status;
1626
1627         status = name_query_recv(subreq, state, &state->result_addrs,
1628                                  &state->num_result_addrs, &state->flags);
1629
1630         for (i=0; i<state->num_sent; i++) {
1631                 if (state->subreqs[i] == subreq) {
1632                         break;
1633                 }
1634         }
1635         if (i == state->num_sent) {
1636                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1637                 return;
1638         }
1639         TALLOC_FREE(state->subreqs[i]);
1640
1641         state->num_received += 1;
1642
1643         if (!NT_STATUS_IS_OK(status)) {
1644
1645                 if (state->num_received >= state->num_addrs) {
1646                         tevent_req_nterror(req, status);
1647                         return;
1648                 }
1649                 /*
1650                  * Still outstanding requests, just wait
1651                  */
1652                 return;
1653         }
1654         state->received_index = i;
1655         tevent_req_done(req);
1656 }
1657
1658 static void name_queries_next(struct tevent_req *subreq)
1659 {
1660         struct tevent_req *req = tevent_req_callback_data(
1661                 subreq, struct tevent_req);
1662         struct name_queries_state *state = tevent_req_data(
1663                 req, struct name_queries_state);
1664
1665         if (!tevent_wakeup_recv(subreq)) {
1666                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1667                 return;
1668         }
1669
1670         subreq = name_query_send(
1671                 state->subreqs, state->ev,
1672                 state->name, state->name_type, state->bcast, state->recurse,
1673                 &state->addrs[state->num_sent]);
1674         if (tevent_req_nomem(subreq, req)) {
1675                 return;
1676         }
1677         tevent_req_set_callback(subreq, name_queries_done, req);
1678         if (!tevent_req_set_endtime(
1679                     subreq, state->ev,
1680                     timeval_current_ofs(0, state->timeout_msec * 1000))) {
1681                 tevent_req_oom(req);
1682                 return;
1683         }
1684         state->subreqs[state->num_sent] = subreq;
1685         state->num_sent += 1;
1686
1687         if (state->num_sent < state->num_addrs) {
1688                 subreq = tevent_wakeup_send(
1689                         state, state->ev,
1690                         timeval_current_ofs(0, state->wait_msec * 1000));
1691                 if (tevent_req_nomem(subreq, req)) {
1692                         return;
1693                 }
1694                 tevent_req_set_callback(subreq, name_queries_next, req);
1695         }
1696 }
1697
1698 static NTSTATUS name_queries_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
1699                                   struct sockaddr_storage **result_addrs,
1700                                   int *num_result_addrs, uint8_t *flags,
1701                                   int *received_index)
1702 {
1703         struct name_queries_state *state = tevent_req_data(
1704                 req, struct name_queries_state);
1705         NTSTATUS status;
1706
1707         if (tevent_req_is_nterror(req, &status)) {
1708                 return status;
1709         }
1710
1711         if (result_addrs != NULL) {
1712                 *result_addrs = talloc_move(mem_ctx, &state->result_addrs);
1713         }
1714         if (num_result_addrs != NULL) {
1715                 *num_result_addrs = state->num_result_addrs;
1716         }
1717         if (flags != NULL) {
1718                 *flags = state->flags;
1719         }
1720         if (received_index != NULL) {
1721                 *received_index = state->received_index;
1722         }
1723         return NT_STATUS_OK;
1724 }
1725
1726 /********************************************************
1727  Resolve via "bcast" method.
1728 *********************************************************/
1729
1730 struct name_resolve_bcast_state {
1731         struct sockaddr_storage *addrs;
1732         int num_addrs;
1733 };
1734
1735 static void name_resolve_bcast_done(struct tevent_req *subreq);
1736
1737 struct tevent_req *name_resolve_bcast_send(TALLOC_CTX *mem_ctx,
1738                                            struct tevent_context *ev,
1739                                            const char *name,
1740                                            int name_type)
1741 {
1742         struct tevent_req *req, *subreq;
1743         struct name_resolve_bcast_state *state;
1744         struct sockaddr_storage *bcast_addrs;
1745         int i, num_addrs, num_bcast_addrs;
1746
1747         req = tevent_req_create(mem_ctx, &state,
1748                                 struct name_resolve_bcast_state);
1749         if (req == NULL) {
1750                 return NULL;
1751         }
1752
1753         if (lp_disable_netbios()) {
1754                 DEBUG(5, ("name_resolve_bcast(%s#%02x): netbios is disabled\n",
1755                           name, name_type));
1756                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
1757                 return tevent_req_post(req, ev);
1758         }
1759
1760         /*
1761          * "bcast" means do a broadcast lookup on all the local interfaces.
1762          */
1763
1764         DEBUG(3, ("name_resolve_bcast: Attempting broadcast lookup "
1765                   "for name %s<0x%x>\n", name, name_type));
1766
1767         num_addrs = iface_count();
1768         bcast_addrs = talloc_array(state, struct sockaddr_storage, num_addrs);
1769         if (tevent_req_nomem(bcast_addrs, req)) {
1770                 return tevent_req_post(req, ev);
1771         }
1772
1773         /*
1774          * Lookup the name on all the interfaces, return on
1775          * the first successful match.
1776          */
1777         num_bcast_addrs = 0;
1778
1779         for (i=0; i<num_addrs; i++) {
1780                 const struct sockaddr_storage *pss = iface_n_bcast(i);
1781
1782                 if (pss->ss_family != AF_INET) {
1783                         continue;
1784                 }
1785                 bcast_addrs[num_bcast_addrs] = *pss;
1786                 num_bcast_addrs += 1;
1787         }
1788
1789         subreq = name_queries_send(state, ev, name, name_type, true, true,
1790                                    bcast_addrs, num_bcast_addrs, 0, 1000);
1791         if (tevent_req_nomem(subreq, req)) {
1792                 return tevent_req_post(req, ev);
1793         }
1794         tevent_req_set_callback(subreq, name_resolve_bcast_done, req);
1795         return req;
1796 }
1797
1798 static void name_resolve_bcast_done(struct tevent_req *subreq)
1799 {
1800         struct tevent_req *req = tevent_req_callback_data(
1801                 subreq, struct tevent_req);
1802         struct name_resolve_bcast_state *state = tevent_req_data(
1803                 req, struct name_resolve_bcast_state);
1804         NTSTATUS status;
1805
1806         status = name_queries_recv(subreq, state,
1807                                    &state->addrs, &state->num_addrs,
1808                                    NULL, NULL);
1809         TALLOC_FREE(subreq);
1810         if (tevent_req_nterror(req, status)) {
1811                 return;
1812         }
1813         tevent_req_done(req);
1814 }
1815
1816 NTSTATUS name_resolve_bcast_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
1817                                  struct sockaddr_storage **addrs,
1818                                  int *num_addrs)
1819 {
1820         struct name_resolve_bcast_state *state = tevent_req_data(
1821                 req, struct name_resolve_bcast_state);
1822         NTSTATUS status;
1823
1824         if (tevent_req_is_nterror(req, &status)) {
1825                 return status;
1826         }
1827         *addrs = talloc_move(mem_ctx, &state->addrs);
1828         *num_addrs = state->num_addrs;
1829         return NT_STATUS_OK;
1830 }
1831
1832 NTSTATUS name_resolve_bcast(const char *name,
1833                         int name_type,
1834                         TALLOC_CTX *mem_ctx,
1835                         struct sockaddr_storage **return_iplist,
1836                         int *return_count)
1837 {
1838         TALLOC_CTX *frame = talloc_stackframe();
1839         struct event_context *ev;
1840         struct tevent_req *req;
1841         NTSTATUS status = NT_STATUS_NO_MEMORY;
1842
1843         ev = event_context_init(frame);
1844         if (ev == NULL) {
1845                 goto fail;
1846         }
1847         req = name_resolve_bcast_send(frame, ev, name, name_type);
1848         if (req == NULL) {
1849                 goto fail;
1850         }
1851         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
1852                 goto fail;
1853         }
1854         status = name_resolve_bcast_recv(req, mem_ctx, return_iplist,
1855                                          return_count);
1856  fail:
1857         TALLOC_FREE(frame);
1858         return status;
1859 }
1860
1861 struct query_wins_list_state {
1862         struct tevent_context *ev;
1863         const char *name;
1864         uint8_t name_type;
1865         struct in_addr *servers;
1866         uint32_t num_servers;
1867         struct sockaddr_storage server;
1868         uint32_t num_sent;
1869
1870         struct sockaddr_storage *addrs;
1871         int num_addrs;
1872         uint8_t flags;
1873 };
1874
1875 static void query_wins_list_done(struct tevent_req *subreq);
1876
1877 /*
1878  * Query a list of (replicating) wins servers in sequence, call them
1879  * dead if they don't reply
1880  */
1881
1882 static struct tevent_req *query_wins_list_send(
1883         TALLOC_CTX *mem_ctx, struct tevent_context *ev,
1884         struct in_addr src_ip, const char *name, uint8_t name_type,
1885         struct in_addr *servers, int num_servers)
1886 {
1887         struct tevent_req *req, *subreq;
1888         struct query_wins_list_state *state;
1889
1890         req = tevent_req_create(mem_ctx, &state,
1891                                 struct query_wins_list_state);
1892         if (req == NULL) {
1893                 return NULL;
1894         }
1895         state->ev = ev;
1896         state->name = name;
1897         state->name_type = name_type;
1898         state->servers = servers;
1899         state->num_servers = num_servers;
1900
1901         if (state->num_servers == 0) {
1902                 tevent_req_nterror(req, NT_STATUS_NOT_FOUND);
1903                 return tevent_req_post(req, ev);
1904         }
1905
1906         in_addr_to_sockaddr_storage(
1907                 &state->server, state->servers[state->num_sent]);
1908
1909         subreq = name_query_send(state, state->ev,
1910                                  state->name, state->name_type,
1911                                  false, true, &state->server);
1912         state->num_sent += 1;
1913         if (tevent_req_nomem(subreq, req)) {
1914                 return tevent_req_post(req, ev);
1915         }
1916         if (!tevent_req_set_endtime(subreq, state->ev,
1917                                     timeval_current_ofs(2, 0))) {
1918                 tevent_req_oom(req);
1919                 return tevent_req_post(req, ev);
1920         }
1921         tevent_req_set_callback(subreq, query_wins_list_done, req);
1922         return req;
1923 }
1924
1925 static void query_wins_list_done(struct tevent_req *subreq)
1926 {
1927         struct tevent_req *req = tevent_req_callback_data(
1928                 subreq, struct tevent_req);
1929         struct query_wins_list_state *state = tevent_req_data(
1930                 req, struct query_wins_list_state);
1931         NTSTATUS status;
1932
1933         status = name_query_recv(subreq, state,
1934                                  &state->addrs, &state->num_addrs,
1935                                  &state->flags);
1936         TALLOC_FREE(subreq);
1937         if (NT_STATUS_IS_OK(status)) {
1938                 tevent_req_done(req);
1939                 return;
1940         }
1941         if (!NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
1942                 tevent_req_nterror(req, status);
1943                 return;
1944         }
1945         wins_srv_died(state->servers[state->num_sent-1],
1946                       my_socket_addr_v4());
1947
1948         if (state->num_sent == state->num_servers) {
1949                 tevent_req_nterror(req, NT_STATUS_NOT_FOUND);
1950                 return;
1951         }
1952
1953         in_addr_to_sockaddr_storage(
1954                 &state->server, state->servers[state->num_sent]);
1955
1956         subreq = name_query_send(state, state->ev,
1957                                  state->name, state->name_type,
1958                                  false, true, &state->server);
1959         state->num_sent += 1;
1960         if (tevent_req_nomem(subreq, req)) {
1961                 return;
1962         }
1963         if (!tevent_req_set_endtime(subreq, state->ev,
1964                                     timeval_current_ofs(2, 0))) {
1965                 tevent_req_oom(req);
1966                 return;
1967         }
1968         tevent_req_set_callback(subreq, query_wins_list_done, req);
1969 }
1970
1971 static NTSTATUS query_wins_list_recv(struct tevent_req *req,
1972                                      TALLOC_CTX *mem_ctx,
1973                                      struct sockaddr_storage **addrs,
1974                                      int *num_addrs,
1975                                      uint8_t *flags)
1976 {
1977         struct query_wins_list_state *state = tevent_req_data(
1978                 req, struct query_wins_list_state);
1979         NTSTATUS status;
1980
1981         if (tevent_req_is_nterror(req, &status)) {
1982                 return status;
1983         }
1984         if (addrs != NULL) {
1985                 *addrs = talloc_move(mem_ctx, &state->addrs);
1986         }
1987         if (num_addrs != NULL) {
1988                 *num_addrs = state->num_addrs;
1989         }
1990         if (flags != NULL) {
1991                 *flags = state->flags;
1992         }
1993         return NT_STATUS_OK;
1994 }
1995
1996 struct resolve_wins_state {
1997         int num_sent;
1998         int num_received;
1999
2000         struct sockaddr_storage *addrs;
2001         int num_addrs;
2002         uint8_t flags;
2003 };
2004
2005 static void resolve_wins_done(struct tevent_req *subreq);
2006
2007 struct tevent_req *resolve_wins_send(TALLOC_CTX *mem_ctx,
2008                                      struct tevent_context *ev,
2009                                      const char *name,
2010                                      int name_type)
2011 {
2012         struct tevent_req *req, *subreq;
2013         struct resolve_wins_state *state;
2014         char **wins_tags = NULL;
2015         struct sockaddr_storage src_ss;
2016         struct in_addr src_ip;
2017         int i, num_wins_tags;
2018
2019         req = tevent_req_create(mem_ctx, &state,
2020                                 struct resolve_wins_state);
2021         if (req == NULL) {
2022                 return NULL;
2023         }
2024
2025         if (wins_srv_count() < 1) {
2026                 DEBUG(3,("resolve_wins: WINS server resolution selected "
2027                         "and no WINS servers listed.\n"));
2028                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
2029                 goto fail;
2030         }
2031
2032         /* the address we will be sending from */
2033         if (!interpret_string_addr(&src_ss, lp_socket_address(),
2034                                 AI_NUMERICHOST|AI_PASSIVE)) {
2035                 zero_sockaddr(&src_ss);
2036         }
2037
2038         if (src_ss.ss_family != AF_INET) {
2039                 char addr[INET6_ADDRSTRLEN];
2040                 print_sockaddr(addr, sizeof(addr), &src_ss);
2041                 DEBUG(3,("resolve_wins: cannot receive WINS replies "
2042                         "on IPv6 address %s\n",
2043                         addr));
2044                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
2045                 goto fail;
2046         }
2047
2048         src_ip = ((const struct sockaddr_in *)(void *)&src_ss)->sin_addr;
2049
2050         wins_tags = wins_srv_tags();
2051         if (wins_tags == NULL) {
2052                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
2053                 goto fail;
2054         }
2055
2056         num_wins_tags = 0;
2057         while (wins_tags[num_wins_tags] != NULL) {
2058                 num_wins_tags += 1;
2059         }
2060
2061         for (i=0; i<num_wins_tags; i++) {
2062                 int num_servers, num_alive;
2063                 struct in_addr *servers, *alive;
2064                 int j;
2065
2066                 if (!wins_server_tag_ips(wins_tags[i], talloc_tos(),
2067                                          &servers, &num_servers)) {
2068                         DEBUG(10, ("wins_server_tag_ips failed for tag %s\n",
2069                                    wins_tags[i]));
2070                         continue;
2071                 }
2072
2073                 alive = talloc_array(state, struct in_addr, num_servers);
2074                 if (tevent_req_nomem(alive, req)) {
2075                         goto fail;
2076                 }
2077
2078                 num_alive = 0;
2079                 for (j=0; j<num_servers; j++) {
2080                         struct in_addr wins_ip = servers[j];
2081
2082                         if (global_in_nmbd && ismyip_v4(wins_ip)) {
2083                                 /* yikes! we'll loop forever */
2084                                 continue;
2085                         }
2086                         /* skip any that have been unresponsive lately */
2087                         if (wins_srv_is_dead(wins_ip, src_ip)) {
2088                                 continue;
2089                         }
2090                         DEBUG(3, ("resolve_wins: using WINS server %s "
2091                                  "and tag '%s'\n",
2092                                   inet_ntoa(wins_ip), wins_tags[i]));
2093                         alive[num_alive] = wins_ip;
2094                         num_alive += 1;
2095                 }
2096                 TALLOC_FREE(servers);
2097
2098                 if (num_alive == 0) {
2099                         continue;
2100                 }
2101
2102                 subreq = query_wins_list_send(
2103                         state, ev, src_ip, name, name_type,
2104                         alive, num_alive);
2105                 if (tevent_req_nomem(subreq, req)) {
2106                         goto fail;
2107                 }
2108                 tevent_req_set_callback(subreq, resolve_wins_done, req);
2109                 state->num_sent += 1;
2110         }
2111
2112         if (state->num_sent == 0) {
2113                 tevent_req_nterror(req, NT_STATUS_NOT_FOUND);
2114                 goto fail;
2115         }
2116
2117         wins_srv_tags_free(wins_tags);
2118         return req;
2119 fail:
2120         wins_srv_tags_free(wins_tags);
2121         return tevent_req_post(req, ev);
2122 }
2123
2124 static void resolve_wins_done(struct tevent_req *subreq)
2125 {
2126         struct tevent_req *req = tevent_req_callback_data(
2127                 subreq, struct tevent_req);
2128         struct resolve_wins_state *state = tevent_req_data(
2129                 req, struct resolve_wins_state);
2130         NTSTATUS status;
2131
2132         status = query_wins_list_recv(subreq, state, &state->addrs,
2133                                       &state->num_addrs, &state->flags);
2134         if (NT_STATUS_IS_OK(status)) {
2135                 tevent_req_done(req);
2136                 return;
2137         }
2138
2139         state->num_received += 1;
2140
2141         if (state->num_received < state->num_sent) {
2142                 /*
2143                  * Wait for the others
2144                  */
2145                 return;
2146         }
2147         tevent_req_nterror(req, status);
2148 }
2149
2150 NTSTATUS resolve_wins_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2151                            struct sockaddr_storage **addrs,
2152                            int *num_addrs, uint8_t *flags)
2153 {
2154         struct resolve_wins_state *state = tevent_req_data(
2155                 req, struct resolve_wins_state);
2156         NTSTATUS status;
2157
2158         if (tevent_req_is_nterror(req, &status)) {
2159                 return status;
2160         }
2161         if (addrs != NULL) {
2162                 *addrs = talloc_move(mem_ctx, &state->addrs);
2163         }
2164         if (num_addrs != NULL) {
2165                 *num_addrs = state->num_addrs;
2166         }
2167         if (flags != NULL) {
2168                 *flags = state->flags;
2169         }
2170         return NT_STATUS_OK;
2171 }
2172
2173 /********************************************************
2174  Resolve via "wins" method.
2175 *********************************************************/
2176
2177 NTSTATUS resolve_wins(const char *name,
2178                 int name_type,
2179                 TALLOC_CTX *mem_ctx,
2180                 struct sockaddr_storage **return_iplist,
2181                 int *return_count)
2182 {
2183         struct tevent_context *ev;
2184         struct tevent_req *req;
2185         NTSTATUS status = NT_STATUS_NO_MEMORY;
2186
2187         ev = tevent_context_init(talloc_tos());
2188         if (ev == NULL) {
2189                 goto fail;
2190         }
2191         req = resolve_wins_send(ev, ev, name, name_type);
2192         if (req == NULL) {
2193                 goto fail;
2194         }
2195         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
2196                 goto fail;
2197         }
2198         status = resolve_wins_recv(req, mem_ctx, return_iplist, return_count,
2199                                    NULL);
2200 fail:
2201         TALLOC_FREE(ev);
2202         return status;
2203 }
2204
2205 /********************************************************
2206  Resolve via "lmhosts" method.
2207 *********************************************************/
2208
2209 static NTSTATUS resolve_lmhosts(const char *name, int name_type,
2210                                 struct ip_service **return_iplist,
2211                                 int *return_count)
2212 {
2213         /*
2214          * "lmhosts" means parse the local lmhosts file.
2215          */
2216         struct sockaddr_storage *ss_list;
2217         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
2218         TALLOC_CTX *ctx = NULL;
2219
2220         *return_iplist = NULL;
2221         *return_count = 0;
2222
2223         DEBUG(3,("resolve_lmhosts: "
2224                 "Attempting lmhosts lookup for name %s<0x%x>\n",
2225                 name, name_type));
2226
2227         ctx = talloc_init("resolve_lmhosts");
2228         if (!ctx) {
2229                 return NT_STATUS_NO_MEMORY;
2230         }
2231
2232         status = resolve_lmhosts_file_as_sockaddr(get_dyn_LMHOSTSFILE(), 
2233                                                   name, name_type, 
2234                                                   ctx, 
2235                                                   &ss_list, 
2236                                                   return_count);
2237         if (NT_STATUS_IS_OK(status)) {
2238                 if (convert_ss2service(return_iplist, 
2239                                        ss_list,
2240                                        *return_count)) {
2241                         talloc_free(ctx);
2242                         return NT_STATUS_OK;
2243                 } else {
2244                         talloc_free(ctx);
2245                         return NT_STATUS_NO_MEMORY;
2246                 }
2247         }
2248         talloc_free(ctx);
2249         return status;
2250 }
2251
2252
2253 /********************************************************
2254  Resolve via "hosts" method.
2255 *********************************************************/
2256
2257 static NTSTATUS resolve_hosts(const char *name, int name_type,
2258                               struct ip_service **return_iplist,
2259                               int *return_count)
2260 {
2261         /*
2262          * "host" means do a localhost, or dns lookup.
2263          */
2264         struct addrinfo hints;
2265         struct addrinfo *ailist = NULL;
2266         struct addrinfo *res = NULL;
2267         int ret = -1;
2268         int i = 0;
2269         const char *dns_hosts_file;
2270
2271         if ( name_type != 0x20 && name_type != 0x0) {
2272                 DEBUG(5, ("resolve_hosts: not appropriate "
2273                         "for name type <0x%x>\n",
2274                         name_type));
2275                 return NT_STATUS_INVALID_PARAMETER;
2276         }
2277
2278         *return_iplist = NULL;
2279         *return_count = 0;
2280
2281         DEBUG(3,("resolve_hosts: Attempting host lookup for name %s<0x%x>\n",
2282                                 name, name_type));
2283
2284         ZERO_STRUCT(hints);
2285         /* By default make sure it supports TCP. */
2286         hints.ai_socktype = SOCK_STREAM;
2287         hints.ai_flags = AI_ADDRCONFIG;
2288
2289 #if !defined(HAVE_IPV6)
2290         /* Unless we have IPv6, we really only want IPv4 addresses back. */
2291         hints.ai_family = AF_INET;
2292 #endif
2293
2294         dns_hosts_file = lp_parm_const_string(-1, "resolv", "host file", NULL);
2295         if (dns_hosts_file) {
2296                 struct sockaddr_storage *ss_list;
2297                 NTSTATUS status;
2298                 TALLOC_CTX *ctx = talloc_stackframe();
2299                 if (!ctx) {
2300                         return NT_STATUS_NO_MEMORY;
2301                 }
2302
2303                 status = resolve_dns_hosts_file_as_sockaddr(dns_hosts_file, name, false,
2304                                                             ctx, &ss_list, return_count);
2305                 if (NT_STATUS_IS_OK(status)) {
2306                         if (convert_ss2service(return_iplist,
2307                                                ss_list,
2308                                                *return_count)) {
2309                                 talloc_free(ctx);
2310                                 return NT_STATUS_OK;
2311                         } else {
2312                                 talloc_free(ctx);
2313                                 return NT_STATUS_NO_MEMORY;
2314                         }
2315                 }
2316                 talloc_free(ctx);
2317                 return NT_STATUS_UNSUCCESSFUL;
2318         }
2319
2320         ret = getaddrinfo(name,
2321                         NULL,
2322                         &hints,
2323                         &ailist);
2324         if (ret) {
2325                 DEBUG(3,("resolve_hosts: getaddrinfo failed for name %s [%s]\n",
2326                         name,
2327                         gai_strerror(ret) ));
2328         }
2329
2330         for (res = ailist; res; res = res->ai_next) {
2331                 struct sockaddr_storage ss;
2332
2333                 if (!res->ai_addr || res->ai_addrlen == 0) {
2334                         continue;
2335                 }
2336
2337                 ZERO_STRUCT(ss);
2338                 memcpy(&ss, res->ai_addr, res->ai_addrlen);
2339
2340                 *return_count += 1;
2341
2342                 *return_iplist = SMB_REALLOC_ARRAY(*return_iplist,
2343                                                 struct ip_service,
2344                                                 *return_count);
2345                 if (!*return_iplist) {
2346                         DEBUG(3,("resolve_hosts: malloc fail !\n"));
2347                         freeaddrinfo(ailist);
2348                         return NT_STATUS_NO_MEMORY;
2349                 }
2350                 (*return_iplist)[i].ss = ss;
2351                 (*return_iplist)[i].port = PORT_NONE;
2352                 i++;
2353         }
2354         if (ailist) {
2355                 freeaddrinfo(ailist);
2356         }
2357         if (*return_count) {
2358                 return NT_STATUS_OK;
2359         }
2360         return NT_STATUS_UNSUCCESSFUL;
2361 }
2362
2363 /********************************************************
2364  Resolve via "ADS" method.
2365 *********************************************************/
2366
2367 /* Special name type used to cause a _kerberos DNS lookup. */
2368 #define KDC_NAME_TYPE 0xDCDC
2369
2370 static NTSTATUS resolve_ads(const char *name,
2371                             int name_type,
2372                             const char *sitename,
2373                             struct ip_service **return_iplist,
2374                             int *return_count)
2375 {
2376         int                     i, j;
2377         NTSTATUS                status;
2378         TALLOC_CTX              *ctx;
2379         struct dns_rr_srv       *dcs = NULL;
2380         int                     numdcs = 0;
2381         int                     numaddrs = 0;
2382
2383         if ((name_type != 0x1c) && (name_type != KDC_NAME_TYPE) &&
2384             (name_type != 0x1b)) {
2385                 return NT_STATUS_INVALID_PARAMETER;
2386         }
2387
2388         if ( (ctx = talloc_init("resolve_ads")) == NULL ) {
2389                 DEBUG(0,("resolve_ads: talloc_init() failed!\n"));
2390                 return NT_STATUS_NO_MEMORY;
2391         }
2392
2393         /* The DNS code needs fixing to find IPv6 addresses... JRA. */
2394
2395         switch (name_type) {
2396                 case 0x1b:
2397                         DEBUG(5,("resolve_ads: Attempting to resolve "
2398                                  "PDC for %s using DNS\n", name));
2399                         status = ads_dns_query_pdc(ctx, name, &dcs, &numdcs);
2400                         break;
2401
2402                 case 0x1c:
2403                         DEBUG(5,("resolve_ads: Attempting to resolve "
2404                                  "DCs for %s using DNS\n", name));
2405                         status = ads_dns_query_dcs(ctx, name, sitename, &dcs,
2406                                                    &numdcs);
2407                         break;
2408                 case KDC_NAME_TYPE:
2409                         DEBUG(5,("resolve_ads: Attempting to resolve "
2410                                  "KDCs for %s using DNS\n", name));
2411                         status = ads_dns_query_kdcs(ctx, name, sitename, &dcs,
2412                                                     &numdcs);
2413                         break;
2414                 default:
2415                         status = NT_STATUS_INVALID_PARAMETER;
2416                         break;
2417         }
2418
2419         if ( !NT_STATUS_IS_OK( status ) ) {
2420                 talloc_destroy(ctx);
2421                 return status;
2422         }
2423
2424         for (i=0;i<numdcs;i++) {
2425                 numaddrs += MAX(dcs[i].num_ips,1);
2426         }
2427
2428         if ((*return_iplist = SMB_MALLOC_ARRAY(struct ip_service, numaddrs)) ==
2429                         NULL ) {
2430                 DEBUG(0,("resolve_ads: malloc failed for %d entries\n",
2431                                         numaddrs ));
2432                 talloc_destroy(ctx);
2433                 return NT_STATUS_NO_MEMORY;
2434         }
2435
2436         /* now unroll the list of IP addresses */
2437
2438         *return_count = 0;
2439         i = 0;
2440         j = 0;
2441         while ( i < numdcs && (*return_count<numaddrs) ) {
2442                 struct ip_service *r = &(*return_iplist)[*return_count];
2443
2444                 r->port = dcs[i].port;
2445
2446                 /* If we don't have an IP list for a name, lookup it up */
2447
2448                 if (!dcs[i].ss_s) {
2449                         interpret_string_addr(&r->ss, dcs[i].hostname, 0);
2450                         i++;
2451                         j = 0;
2452                 } else {
2453                         /* use the IP addresses from the SRV sresponse */
2454
2455                         if ( j >= dcs[i].num_ips ) {
2456                                 i++;
2457                                 j = 0;
2458                                 continue;
2459                         }
2460
2461                         r->ss = dcs[i].ss_s[j];
2462                         j++;
2463                 }
2464
2465                 /* make sure it is a valid IP.  I considered checking the
2466                  * negative connection cache, but this is the wrong place
2467                  * for it. Maybe only as a hack. After think about it, if
2468                  * all of the IP addresses returned from DNS are dead, what
2469                  * hope does a netbios name lookup have ? The standard reason
2470                  * for falling back to netbios lookups is that our DNS server
2471                  * doesn't know anything about the DC's   -- jerry */
2472
2473                 if (!is_zero_addr(&r->ss)) {
2474                         (*return_count)++;
2475                 }
2476         }
2477
2478         talloc_destroy(ctx);
2479         return NT_STATUS_OK;
2480 }
2481
2482 /*******************************************************************
2483  Internal interface to resolve a name into an IP address.
2484  Use this function if the string is either an IP address, DNS
2485  or host name or NetBIOS name. This uses the name switch in the
2486  smb.conf to determine the order of name resolution.
2487
2488  Added support for ip addr/port to support ADS ldap servers.
2489  the only place we currently care about the port is in the
2490  resolve_hosts() when looking up DC's via SRV RR entries in DNS
2491 **********************************************************************/
2492
2493 NTSTATUS internal_resolve_name(const char *name,
2494                                 int name_type,
2495                                 const char *sitename,
2496                                 struct ip_service **return_iplist,
2497                                 int *return_count,
2498                                 const char *resolve_order)
2499 {
2500         char *tok;
2501         const char *ptr;
2502         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
2503         int i;
2504         TALLOC_CTX *frame = NULL;
2505
2506         *return_iplist = NULL;
2507         *return_count = 0;
2508
2509         DEBUG(10, ("internal_resolve_name: looking up %s#%x (sitename %s)\n",
2510                         name, name_type, sitename ? sitename : "(null)"));
2511
2512         if (is_ipaddress(name)) {
2513                 if ((*return_iplist = SMB_MALLOC_P(struct ip_service)) ==
2514                                 NULL) {
2515                         DEBUG(0,("internal_resolve_name: malloc fail !\n"));
2516                         return NT_STATUS_NO_MEMORY;
2517                 }
2518
2519                 /* ignore the port here */
2520                 (*return_iplist)->port = PORT_NONE;
2521
2522                 /* if it's in the form of an IP address then get the lib to interpret it */
2523                 if (!interpret_string_addr(&(*return_iplist)->ss,
2524                                         name, AI_NUMERICHOST)) {
2525                         DEBUG(1,("internal_resolve_name: interpret_string_addr "
2526                                 "failed on %s\n",
2527                                 name));
2528                         SAFE_FREE(*return_iplist);
2529                         return NT_STATUS_INVALID_PARAMETER;
2530                 }
2531                 *return_count = 1;
2532                 return NT_STATUS_OK;
2533         }
2534
2535         /* Check name cache */
2536
2537         if (namecache_fetch(name, name_type, return_iplist, return_count)) {
2538                 /* This could be a negative response */
2539                 if (*return_count > 0) {
2540                         return NT_STATUS_OK;
2541                 } else {
2542                         return NT_STATUS_UNSUCCESSFUL;
2543                 }
2544         }
2545
2546         /* set the name resolution order */
2547
2548         if (strcmp( resolve_order, "NULL") == 0) {
2549                 DEBUG(8,("internal_resolve_name: all lookups disabled\n"));
2550                 return NT_STATUS_INVALID_PARAMETER;
2551         }
2552
2553         if (!resolve_order[0]) {
2554                 ptr = "host";
2555         } else {
2556                 ptr = resolve_order;
2557         }
2558
2559         /* iterate through the name resolution backends */
2560
2561         frame = talloc_stackframe();
2562         while (next_token_talloc(frame, &ptr, &tok, LIST_SEP)) {
2563                 if((strequal(tok, "host") || strequal(tok, "hosts"))) {
2564                         status = resolve_hosts(name, name_type, return_iplist,
2565                                                return_count);
2566                         if (NT_STATUS_IS_OK(status)) {
2567                                 goto done;
2568                         }
2569                 } else if(strequal( tok, "kdc")) {
2570                         /* deal with KDC_NAME_TYPE names here.
2571                          * This will result in a SRV record lookup */
2572                         status = resolve_ads(name, KDC_NAME_TYPE, sitename,
2573                                              return_iplist, return_count);
2574                         if (NT_STATUS_IS_OK(status)) {
2575                                 /* Ensure we don't namecache
2576                                  * this with the KDC port. */
2577                                 name_type = KDC_NAME_TYPE;
2578                                 goto done;
2579                         }
2580                 } else if(strequal( tok, "ads")) {
2581                         /* deal with 0x1c and 0x1b names here.
2582                          * This will result in a SRV record lookup */
2583                         status = resolve_ads(name, name_type, sitename,
2584                                              return_iplist, return_count);
2585                         if (NT_STATUS_IS_OK(status)) {
2586                                 goto done;
2587                         }
2588                 } else if(strequal( tok, "lmhosts")) {
2589                         status = resolve_lmhosts(name, name_type,
2590                                                  return_iplist, return_count);
2591                         if (NT_STATUS_IS_OK(status)) {
2592                                 goto done;
2593                         }
2594                 } else if(strequal( tok, "wins")) {
2595                         /* don't resolve 1D via WINS */
2596                         struct sockaddr_storage *ss_list;
2597                         if (name_type != 0x1D) {
2598                                 status = resolve_wins(name, name_type,
2599                                                       talloc_tos(),
2600                                                       &ss_list,
2601                                                       return_count);
2602                                 if (NT_STATUS_IS_OK(status)) {
2603                                         if (!convert_ss2service(return_iplist,
2604                                                                 ss_list,
2605                                                                 *return_count)) {
2606                                                 status = NT_STATUS_NO_MEMORY;
2607                                         }
2608                                         goto done;
2609                                 }
2610                         }
2611                 } else if(strequal( tok, "bcast")) {
2612                         struct sockaddr_storage *ss_list;
2613                         status = name_resolve_bcast(
2614                                 name, name_type, talloc_tos(),
2615                                 &ss_list, return_count);
2616                         if (NT_STATUS_IS_OK(status)) {
2617                                 if (!convert_ss2service(return_iplist,
2618                                                         ss_list,
2619                                                         *return_count)) {
2620                                         status = NT_STATUS_NO_MEMORY;
2621                                 }
2622                                 goto done;
2623                         }
2624                 } else {
2625                         DEBUG(0,("resolve_name: unknown name switch type %s\n",
2626                                 tok));
2627                 }
2628         }
2629
2630         /* All of the resolve_* functions above have returned false. */
2631
2632         TALLOC_FREE(frame);
2633         SAFE_FREE(*return_iplist);
2634         *return_count = 0;
2635
2636         return NT_STATUS_UNSUCCESSFUL;
2637
2638   done:
2639
2640         /* Remove duplicate entries.  Some queries, notably #1c (domain
2641         controllers) return the PDC in iplist[0] and then all domain
2642         controllers including the PDC in iplist[1..n].  Iterating over
2643         the iplist when the PDC is down will cause two sets of timeouts. */
2644
2645         if ( *return_count ) {
2646                 *return_count = remove_duplicate_addrs2(*return_iplist,
2647                                         *return_count );
2648         }
2649
2650         /* Save in name cache */
2651         if ( DEBUGLEVEL >= 100 ) {
2652                 for (i = 0; i < *return_count && DEBUGLEVEL == 100; i++) {
2653                         char addr[INET6_ADDRSTRLEN];
2654                         print_sockaddr(addr, sizeof(addr),
2655                                         &(*return_iplist)[i].ss);
2656                         DEBUG(100, ("Storing name %s of type %d (%s:%d)\n",
2657                                         name,
2658                                         name_type,
2659                                         addr,
2660                                         (*return_iplist)[i].port));
2661                 }
2662         }
2663
2664         namecache_store(name, name_type, *return_count, *return_iplist);
2665
2666         /* Display some debugging info */
2667
2668         if ( DEBUGLEVEL >= 10 ) {
2669                 DEBUG(10, ("internal_resolve_name: returning %d addresses: ",
2670                                         *return_count));
2671
2672                 for (i = 0; i < *return_count; i++) {
2673                         char addr[INET6_ADDRSTRLEN];
2674                         print_sockaddr(addr, sizeof(addr),
2675                                         &(*return_iplist)[i].ss);
2676                         DEBUGADD(10, ("%s:%d ",
2677                                         addr,
2678                                         (*return_iplist)[i].port));
2679                 }
2680                 DEBUG(10, ("\n"));
2681         }
2682
2683         TALLOC_FREE(frame);
2684         return status;
2685 }
2686
2687 /********************************************************
2688  Internal interface to resolve a name into one IP address.
2689  Use this function if the string is either an IP address, DNS
2690  or host name or NetBIOS name. This uses the name switch in the
2691  smb.conf to determine the order of name resolution.
2692 *********************************************************/
2693
2694 bool resolve_name(const char *name,
2695                 struct sockaddr_storage *return_ss,
2696                 int name_type,
2697                 bool prefer_ipv4)
2698 {
2699         struct ip_service *ss_list = NULL;
2700         char *sitename = NULL;
2701         int count = 0;
2702
2703         if (is_ipaddress(name)) {
2704                 return interpret_string_addr(return_ss, name, AI_NUMERICHOST);
2705         }
2706
2707         sitename = sitename_fetch(lp_realm()); /* wild guess */
2708
2709         if (NT_STATUS_IS_OK(internal_resolve_name(name, name_type, sitename,
2710                                                   &ss_list, &count,
2711                                                   lp_name_resolve_order()))) {
2712                 int i;
2713
2714                 if (prefer_ipv4) {
2715                         for (i=0; i<count; i++) {
2716                                 if (!is_zero_addr(&ss_list[i].ss) &&
2717                                     !is_broadcast_addr((struct sockaddr *)(void *)&ss_list[i].ss) &&
2718                                                 (ss_list[i].ss.ss_family == AF_INET)) {
2719                                         *return_ss = ss_list[i].ss;
2720                                         SAFE_FREE(ss_list);
2721                                         SAFE_FREE(sitename);
2722                                         return True;
2723                                 }
2724                         }
2725                 }
2726
2727                 /* only return valid addresses for TCP connections */
2728                 for (i=0; i<count; i++) {
2729                         if (!is_zero_addr(&ss_list[i].ss) &&
2730                             !is_broadcast_addr((struct sockaddr *)(void *)&ss_list[i].ss)) {
2731                                 *return_ss = ss_list[i].ss;
2732                                 SAFE_FREE(ss_list);
2733                                 SAFE_FREE(sitename);
2734                                 return True;
2735                         }
2736                 }
2737         }
2738
2739         SAFE_FREE(ss_list);
2740         SAFE_FREE(sitename);
2741         return False;
2742 }
2743
2744 /********************************************************
2745  Internal interface to resolve a name into a list of IP addresses.
2746  Use this function if the string is either an IP address, DNS
2747  or host name or NetBIOS name. This uses the name switch in the
2748  smb.conf to determine the order of name resolution.
2749 *********************************************************/
2750
2751 NTSTATUS resolve_name_list(TALLOC_CTX *ctx,
2752                 const char *name,
2753                 int name_type,
2754                 struct sockaddr_storage **return_ss_arr,
2755                 unsigned int *p_num_entries)
2756 {
2757         struct ip_service *ss_list = NULL;
2758         char *sitename = NULL;
2759         int count = 0;
2760         int i;
2761         unsigned int num_entries;
2762         NTSTATUS status;
2763
2764         *p_num_entries = 0;
2765         *return_ss_arr = NULL;
2766
2767         if (is_ipaddress(name)) {
2768                 *return_ss_arr = talloc(ctx, struct sockaddr_storage);
2769                 if (!*return_ss_arr) {
2770                         return NT_STATUS_NO_MEMORY;
2771                 }
2772                 if (!interpret_string_addr(*return_ss_arr, name, AI_NUMERICHOST)) {
2773                         TALLOC_FREE(*return_ss_arr);
2774                         return NT_STATUS_BAD_NETWORK_NAME;
2775                 }
2776                 *p_num_entries = 1;
2777                 return NT_STATUS_OK;
2778         }
2779
2780         sitename = sitename_fetch(lp_realm()); /* wild guess */
2781
2782         status = internal_resolve_name(name, name_type, sitename,
2783                                                   &ss_list, &count,
2784                                                   lp_name_resolve_order());
2785         SAFE_FREE(sitename);
2786
2787         if (!NT_STATUS_IS_OK(status)) {
2788                 return status;
2789         }
2790
2791         /* only return valid addresses for TCP connections */
2792         for (i=0, num_entries = 0; i<count; i++) {
2793                 if (!is_zero_addr(&ss_list[i].ss) &&
2794                     !is_broadcast_addr((struct sockaddr *)(void *)&ss_list[i].ss)) {
2795                         num_entries++;
2796                 }
2797         }
2798         if (num_entries == 0) {
2799                 SAFE_FREE(ss_list);
2800                 return NT_STATUS_BAD_NETWORK_NAME;
2801         }
2802
2803         *return_ss_arr = talloc_array(ctx,
2804                                 struct sockaddr_storage,
2805                                 num_entries);
2806         if (!(*return_ss_arr)) {
2807                 SAFE_FREE(ss_list);
2808                 return NT_STATUS_NO_MEMORY;
2809         }
2810
2811         for (i=0, num_entries = 0; i<count; i++) {
2812                 if (!is_zero_addr(&ss_list[i].ss) &&
2813                     !is_broadcast_addr((struct sockaddr *)(void *)&ss_list[i].ss)) {
2814                         (*return_ss_arr)[num_entries++] = ss_list[i].ss;
2815                 }
2816         }
2817
2818         status = NT_STATUS_OK;
2819         *p_num_entries = num_entries;
2820
2821         SAFE_FREE(ss_list);
2822         return NT_STATUS_OK;
2823 }
2824
2825 /********************************************************
2826  Find the IP address of the master browser or DMB for a workgroup.
2827 *********************************************************/
2828
2829 bool find_master_ip(const char *group, struct sockaddr_storage *master_ss)
2830 {
2831         struct ip_service *ip_list = NULL;
2832         int count = 0;
2833         NTSTATUS status;
2834
2835         if (lp_disable_netbios()) {
2836                 DEBUG(5,("find_master_ip(%s): netbios is disabled\n", group));
2837                 return false;
2838         }
2839
2840         status = internal_resolve_name(group, 0x1D, NULL, &ip_list, &count,
2841                                        lp_name_resolve_order());
2842         if (NT_STATUS_IS_OK(status)) {
2843                 *master_ss = ip_list[0].ss;
2844                 SAFE_FREE(ip_list);
2845                 return true;
2846         }
2847
2848         status = internal_resolve_name(group, 0x1B, NULL, &ip_list, &count,
2849                                        lp_name_resolve_order());
2850         if (NT_STATUS_IS_OK(status)) {
2851                 *master_ss = ip_list[0].ss;
2852                 SAFE_FREE(ip_list);
2853                 return true;
2854         }
2855
2856         SAFE_FREE(ip_list);
2857         return false;
2858 }
2859
2860 /********************************************************
2861  Get the IP address list of the primary domain controller
2862  for a domain.
2863 *********************************************************/
2864
2865 bool get_pdc_ip(const char *domain, struct sockaddr_storage *pss)
2866 {
2867         struct ip_service *ip_list = NULL;
2868         int count = 0;
2869         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
2870
2871         /* Look up #1B name */
2872
2873         if (lp_security() == SEC_ADS) {
2874                 status = internal_resolve_name(domain, 0x1b, NULL, &ip_list,
2875                                                &count, "ads");
2876         }
2877
2878         if (!NT_STATUS_IS_OK(status) || count == 0) {
2879                 status = internal_resolve_name(domain, 0x1b, NULL, &ip_list,
2880                                                &count,
2881                                                lp_name_resolve_order());
2882                 if (!NT_STATUS_IS_OK(status)) {
2883                         return false;
2884                 }
2885         }
2886
2887         /* if we get more than 1 IP back we have to assume it is a
2888            multi-homed PDC and not a mess up */
2889
2890         if ( count > 1 ) {
2891                 DEBUG(6,("get_pdc_ip: PDC has %d IP addresses!\n", count));
2892                 sort_service_list(ip_list, count);
2893         }
2894
2895         *pss = ip_list[0].ss;
2896         SAFE_FREE(ip_list);
2897         return true;
2898 }
2899
2900 /* Private enum type for lookups. */
2901
2902 enum dc_lookup_type { DC_NORMAL_LOOKUP, DC_ADS_ONLY, DC_KDC_ONLY };
2903
2904 /********************************************************
2905  Get the IP address list of the domain controllers for
2906  a domain.
2907 *********************************************************/
2908
2909 static NTSTATUS get_dc_list(const char *domain,
2910                         const char *sitename,
2911                         struct ip_service **ip_list,
2912                         int *count,
2913                         enum dc_lookup_type lookup_type,
2914                         bool *ordered)
2915 {
2916         char *resolve_order = NULL;
2917         char *saf_servername = NULL;
2918         char *pserver = NULL;
2919         const char *p;
2920         char *port_str = NULL;
2921         int port;
2922         char *name;
2923         int num_addresses = 0;
2924         int  local_count, i, j;
2925         struct ip_service *return_iplist = NULL;
2926         struct ip_service *auto_ip_list = NULL;
2927         bool done_auto_lookup = false;
2928         int auto_count = 0;
2929         NTSTATUS status;
2930         TALLOC_CTX *ctx = talloc_init("get_dc_list");
2931
2932         *ip_list = NULL;
2933         *count = 0;
2934
2935         if (!ctx) {
2936                 return NT_STATUS_NO_MEMORY;
2937         }
2938
2939         *ordered = False;
2940
2941         /* if we are restricted to solely using DNS for looking
2942            up a domain controller, make sure that host lookups
2943            are enabled for the 'name resolve order'.  If host lookups
2944            are disabled and ads_only is True, then set the string to
2945            NULL. */
2946
2947         resolve_order = talloc_strdup(ctx, lp_name_resolve_order());
2948         if (!resolve_order) {
2949                 status = NT_STATUS_NO_MEMORY;
2950                 goto out;
2951         }
2952         strlower_m(resolve_order);
2953         if (lookup_type == DC_ADS_ONLY)  {
2954                 if (strstr( resolve_order, "host")) {
2955                         resolve_order = talloc_strdup(ctx, "ads");
2956
2957                         /* DNS SRV lookups used by the ads resolver
2958                            are already sorted by priority and weight */
2959                         *ordered = true;
2960                 } else {
2961                         resolve_order = talloc_strdup(ctx, "NULL");
2962                 }
2963         } else if (lookup_type == DC_KDC_ONLY) {
2964                 /* DNS SRV lookups used by the ads/kdc resolver
2965                    are already sorted by priority and weight */
2966                 *ordered = true;
2967                 resolve_order = talloc_strdup(ctx, "kdc");
2968         }
2969         if (!resolve_order) {
2970                 status = NT_STATUS_NO_MEMORY;
2971                 goto out;
2972         }
2973
2974         /* fetch the server we have affinity for.  Add the
2975            'password server' list to a search for our domain controllers */
2976
2977         saf_servername = saf_fetch( domain);
2978
2979         if (strequal(domain, lp_workgroup()) || strequal(domain, lp_realm())) {
2980                 pserver = talloc_asprintf(ctx, "%s, %s",
2981                         saf_servername ? saf_servername : "",
2982                         lp_passwordserver());
2983         } else {
2984                 pserver = talloc_asprintf(ctx, "%s, *",
2985                         saf_servername ? saf_servername : "");
2986         }
2987
2988         SAFE_FREE(saf_servername);
2989         if (!pserver) {
2990                 status = NT_STATUS_NO_MEMORY;
2991                 goto out;
2992         }
2993
2994         /* if we are starting from scratch, just lookup DOMAIN<0x1c> */
2995
2996         if (!*pserver ) {
2997                 DEBUG(10,("get_dc_list: no preferred domain controllers.\n"));
2998                 status = internal_resolve_name(domain, 0x1C, sitename, ip_list,
2999                                              count, resolve_order);
3000                 goto out;
3001         }
3002
3003         DEBUG(3,("get_dc_list: preferred server list: \"%s\"\n", pserver ));
3004
3005         /*
3006          * if '*' appears in the "password server" list then add
3007          * an auto lookup to the list of manually configured
3008          * DC's.  If any DC is listed by name, then the list should be
3009          * considered to be ordered
3010          */
3011
3012         p = pserver;
3013         while (next_token_talloc(ctx, &p, &name, LIST_SEP)) {
3014                 if (!done_auto_lookup && strequal(name, "*")) {
3015                         status = internal_resolve_name(domain, 0x1C, sitename,
3016                                                        &auto_ip_list,
3017                                                        &auto_count,
3018                                                        resolve_order);
3019                         if (NT_STATUS_IS_OK(status)) {
3020                                 num_addresses += auto_count;
3021                         }
3022                         done_auto_lookup = true;
3023                         DEBUG(8,("Adding %d DC's from auto lookup\n",
3024                                                 auto_count));
3025                 } else  {
3026                         num_addresses++;
3027                 }
3028         }
3029
3030         /* if we have no addresses and haven't done the auto lookup, then
3031            just return the list of DC's.  Or maybe we just failed. */
3032
3033         if ((num_addresses == 0)) {
3034                 if (done_auto_lookup) {
3035                         DEBUG(4,("get_dc_list: no servers found\n"));
3036                         status = NT_STATUS_NO_LOGON_SERVERS;
3037                         goto out;
3038                 }
3039                 status = internal_resolve_name(domain, 0x1C, sitename, ip_list,
3040                                              count, resolve_order);
3041                 goto out;
3042         }
3043
3044         if ((return_iplist = SMB_MALLOC_ARRAY(struct ip_service,
3045                                         num_addresses)) == NULL) {
3046                 DEBUG(3,("get_dc_list: malloc fail !\n"));
3047                 status = NT_STATUS_NO_MEMORY;
3048                 goto out;
3049         }
3050
3051         p = pserver;
3052         local_count = 0;
3053
3054         /* fill in the return list now with real IP's */
3055
3056         while ((local_count<num_addresses) &&
3057                         next_token_talloc(ctx, &p, &name, LIST_SEP)) {
3058                 struct sockaddr_storage name_ss;
3059
3060                 /* copy any addersses from the auto lookup */
3061
3062                 if (strequal(name, "*")) {
3063                         for (j=0; j<auto_count; j++) {
3064                                 char addr[INET6_ADDRSTRLEN];
3065                                 print_sockaddr(addr,
3066                                                 sizeof(addr),
3067                                                 &auto_ip_list[j].ss);
3068                                 /* Check for and don't copy any
3069                                  * known bad DC IP's. */
3070                                 if(!NT_STATUS_IS_OK(check_negative_conn_cache(
3071                                                 domain,
3072                                                 addr))) {
3073                                         DEBUG(5,("get_dc_list: "
3074                                                 "negative entry %s removed "
3075                                                 "from DC list\n",
3076                                                 addr));
3077                                         continue;
3078                                 }
3079                                 return_iplist[local_count].ss =
3080                                         auto_ip_list[j].ss;
3081                                 return_iplist[local_count].port =
3082                                         auto_ip_list[j].port;
3083                                 local_count++;
3084                         }
3085                         continue;
3086                 }
3087
3088                 /* added support for address:port syntax for ads
3089                  * (not that I think anyone will ever run the LDAP
3090                  * server in an AD domain on something other than
3091                  * port 389 */
3092
3093                 port = (lp_security() == SEC_ADS) ? LDAP_PORT : PORT_NONE;
3094                 if ((port_str=strchr(name, ':')) != NULL) {
3095                         *port_str = '\0';
3096                         port_str++;
3097                         port = atoi(port_str);
3098                 }
3099
3100                 /* explicit lookup; resolve_name() will
3101                  * handle names & IP addresses */
3102                 if (resolve_name( name, &name_ss, 0x20, true )) {
3103                         char addr[INET6_ADDRSTRLEN];
3104                         print_sockaddr(addr,
3105                                         sizeof(addr),
3106                                         &name_ss);
3107
3108                         /* Check for and don't copy any known bad DC IP's. */
3109                         if( !NT_STATUS_IS_OK(check_negative_conn_cache(domain,
3110                                                         addr)) ) {
3111                                 DEBUG(5,("get_dc_list: negative entry %s "
3112                                         "removed from DC list\n",
3113                                         name ));
3114                                 continue;
3115                         }
3116
3117                         return_iplist[local_count].ss = name_ss;
3118                         return_iplist[local_count].port = port;
3119                         local_count++;
3120                         *ordered = true;
3121                 }
3122         }
3123
3124         /* need to remove duplicates in the list if we have any
3125            explicit password servers */
3126
3127         if (local_count) {
3128                 local_count = remove_duplicate_addrs2(return_iplist,
3129                                 local_count );
3130         }
3131
3132         /* For DC's we always prioritize IPv4 due to W2K3 not
3133          * supporting LDAP, KRB5 or CLDAP over IPv6. */
3134
3135         if (local_count && return_iplist) {
3136                 prioritize_ipv4_list(return_iplist, local_count);
3137         }
3138
3139         if ( DEBUGLEVEL >= 4 ) {
3140                 DEBUG(4,("get_dc_list: returning %d ip addresses "
3141                                 "in an %sordered list\n",
3142                                 local_count,
3143                                 *ordered ? "":"un"));
3144                 DEBUG(4,("get_dc_list: "));
3145                 for ( i=0; i<local_count; i++ ) {
3146                         char addr[INET6_ADDRSTRLEN];
3147                         print_sockaddr(addr,
3148                                         sizeof(addr),
3149                                         &return_iplist[i].ss);
3150                         DEBUGADD(4,("%s:%d ", addr, return_iplist[i].port ));
3151                 }
3152                 DEBUGADD(4,("\n"));
3153         }
3154
3155         *ip_list = return_iplist;
3156         *count = local_count;
3157
3158         status = ( *count != 0 ? NT_STATUS_OK : NT_STATUS_NO_LOGON_SERVERS );
3159
3160   out:
3161
3162         if (!NT_STATUS_IS_OK(status)) {
3163                 SAFE_FREE(return_iplist);
3164                 *ip_list = NULL;
3165                 *count = 0;
3166         }
3167
3168         SAFE_FREE(auto_ip_list);
3169         TALLOC_FREE(ctx);
3170         return status;
3171 }
3172
3173 /*********************************************************************
3174  Small wrapper function to get the DC list and sort it if neccessary.
3175 *********************************************************************/
3176
3177 NTSTATUS get_sorted_dc_list( const char *domain,
3178                         const char *sitename,
3179                         struct ip_service **ip_list,
3180                         int *count,
3181                         bool ads_only )
3182 {
3183         bool ordered = false;
3184         NTSTATUS status;
3185         enum dc_lookup_type lookup_type = DC_NORMAL_LOOKUP;
3186
3187         *ip_list = NULL;
3188         *count = 0;
3189
3190         DEBUG(8,("get_sorted_dc_list: attempting lookup "
3191                 "for name %s (sitename %s) using [%s]\n",
3192                 domain,
3193                 sitename ? sitename : "NULL",
3194                 (ads_only ? "ads" : lp_name_resolve_order())));
3195
3196         if (ads_only) {
3197                 lookup_type = DC_ADS_ONLY;
3198         }
3199
3200         status = get_dc_list(domain, sitename, ip_list,
3201                         count, lookup_type, &ordered);
3202         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_LOGON_SERVERS)
3203             && sitename) {
3204                 DEBUG(3,("get_sorted_dc_list: no server for name %s available"
3205                          " in site %s, fallback to all servers\n",
3206                          domain, sitename));
3207                 status = get_dc_list(domain, NULL, ip_list,
3208                                      count, lookup_type, &ordered);
3209         }
3210
3211         if (!NT_STATUS_IS_OK(status)) {
3212                 SAFE_FREE(*ip_list);
3213                 *count = 0;
3214                 return status;
3215         }
3216