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