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 "librpc/gen_ndr/messaging.h"
  26 #include "lib/async_req/async_sock.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((struct sockaddr *)&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((struct sockaddr *)&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         struct timeval timeout;
1181
1182         req = tevent_req_create(mem_ctx, &state, struct name_query_state);
1183         if (req == NULL) {
1184                 return NULL;
1185         }
1186         state->bcast = bcast;
1187
1188         if (addr->ss_family != AF_INET) {
1189                 /* Can't do node status to IPv6 */
1190                 tevent_req_nterror(req, NT_STATUS_INVALID_ADDRESS);
1191                 return tevent_req_post(req, ev);
1192         }
1193
1194         if (lp_disable_netbios()) {
1195                 DEBUG(5,("name_query(%s#%02x): netbios is disabled\n",
1196                                         name, name_type));
1197                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
1198                 return tevent_req_post(req, ev);
1199         }
1200
1201         state->addr = *addr;
1202         in_addr = (struct sockaddr_in *)(void *)&state->addr;
1203         in_addr->sin_port = htons(NMB_PORT);
1204
1205         if (!interpret_string_addr(&state->my_addr, lp_socket_address(),
1206                                    AI_NUMERICHOST|AI_PASSIVE)) {
1207                 zero_sockaddr(&state->my_addr);
1208         }
1209
1210         ZERO_STRUCT(p);
1211         nmb->header.name_trn_id = generate_trn_id();
1212         nmb->header.opcode = 0;
1213         nmb->header.response = false;
1214         nmb->header.nm_flags.bcast = bcast;
1215         nmb->header.nm_flags.recursion_available = false;
1216         nmb->header.nm_flags.recursion_desired = recurse;
1217         nmb->header.nm_flags.trunc = false;
1218         nmb->header.nm_flags.authoritative = false;
1219         nmb->header.rcode = 0;
1220         nmb->header.qdcount = 1;
1221         nmb->header.ancount = 0;
1222         nmb->header.nscount = 0;
1223         nmb->header.arcount = 0;
1224
1225         make_nmb_name(&nmb->question.question_name,name,name_type);
1226
1227         nmb->question.question_type = 0x20;
1228         nmb->question.question_class = 0x1;
1229
1230         state->buflen = build_packet((char *)state->buf, sizeof(state->buf),
1231                                      &p);
1232         if (state->buflen == 0) {
1233                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1234                 DEBUG(10, ("build_packet failed\n"));
1235                 return tevent_req_post(req, ev);
1236         }
1237
1238         subreq = nb_trans_send(state, ev, &state->my_addr, &state->addr, bcast,
1239                                state->buf, state->buflen,
1240                                NMB_PACKET, nmb->header.name_trn_id,
1241                                name_query_validator, state);
1242         if (tevent_req_nomem(subreq, req)) {
1243                 DEBUG(10, ("nb_trans_send failed\n"));
1244                 return tevent_req_post(req, ev);
1245         }
1246         if (bcast) {
1247                 timeout = timeval_current_ofs(0, 250000);
1248         } else {
1249                 timeout = timeval_current_ofs(2, 0);
1250         }
1251         if (!tevent_req_set_endtime(req, ev, timeout)) {
1252                 return tevent_req_post(req, ev);
1253         }
1254         tevent_req_set_callback(subreq, name_query_done, req);
1255         return req;
1256 }
1257
1258 static bool name_query_validator(struct packet_struct *p, void *private_data)
1259 {
1260         struct name_query_state *state = talloc_get_type_abort(
1261                 private_data, struct name_query_state);
1262         struct nmb_packet *nmb = &p->packet.nmb;
1263         struct sockaddr_storage *tmp_addrs;
1264         int i;
1265
1266         debug_nmb_packet(p);
1267
1268         /*
1269          * If we get a Negative Name Query Response from a WINS
1270          * server, we should report it and give up.
1271          */
1272         if( 0 == nmb->header.opcode     /* A query response   */
1273             && !state->bcast            /* from a WINS server */
1274             && nmb->header.rcode        /* Error returned     */
1275                 ) {
1276
1277                 if( DEBUGLVL( 3 ) ) {
1278                         /* Only executed if DEBUGLEVEL >= 3 */
1279                         dbgtext( "Negative name query "
1280                                  "response, rcode 0x%02x: ",
1281                                  nmb->header.rcode );
1282                         switch( nmb->header.rcode ) {
1283                         case 0x01:
1284                                 dbgtext("Request was invalidly formatted.\n");
1285                                 break;
1286                         case 0x02:
1287                                 dbgtext("Problem with NBNS, cannot process "
1288                                         "name.\n");
1289                                 break;
1290                         case 0x03:
1291                                 dbgtext("The name requested does not "
1292                                         "exist.\n");
1293                                 break;
1294                         case 0x04:
1295                                 dbgtext("Unsupported request error.\n");
1296                                 break;
1297                         case 0x05:
1298                                 dbgtext("Query refused error.\n");
1299                                 break;
1300                         default:
1301                                 dbgtext("Unrecognized error code.\n" );
1302                                 break;
1303                         }
1304                 }
1305
1306                 /*
1307                  * We accept this packet as valid, but tell the upper
1308                  * layers that it's a negative response.
1309                  */
1310                 state->validate_error = NT_STATUS_NOT_FOUND;
1311                 return true;
1312         }
1313
1314         if (nmb->header.opcode != 0 ||
1315             nmb->header.nm_flags.bcast ||
1316             nmb->header.rcode ||
1317             !nmb->header.ancount) {
1318                 /*
1319                  * XXXX what do we do with this? Could be a redirect,
1320                  * but we'll discard it for the moment.
1321                  */
1322                 return false;
1323         }
1324
1325         tmp_addrs = TALLOC_REALLOC_ARRAY(
1326                 state, state->addrs, struct sockaddr_storage,
1327                 state->num_addrs + nmb->answers->rdlength/6);
1328         if (tmp_addrs == NULL) {
1329                 state->validate_error = NT_STATUS_NO_MEMORY;
1330                 return true;
1331         }
1332         state->addrs = tmp_addrs;
1333
1334         DEBUG(2,("Got a positive name query response "
1335                  "from %s ( ", inet_ntoa(p->ip)));
1336
1337         for (i=0; i<nmb->answers->rdlength/6; i++) {
1338                 struct in_addr ip;
1339                 putip((char *)&ip,&nmb->answers->rdata[2+i*6]);
1340                 in_addr_to_sockaddr_storage(
1341                         &state->addrs[state->num_addrs], ip);
1342                 DEBUGADD(2,("%s ",inet_ntoa(ip)));
1343                 state->num_addrs += 1;
1344         }
1345         DEBUGADD(2,(")\n"));
1346
1347         /* We add the flags back ... */
1348         if (nmb->header.response)
1349                 state->flags |= NM_FLAGS_RS;
1350         if (nmb->header.nm_flags.authoritative)
1351                 state->flags |= NM_FLAGS_AA;
1352         if (nmb->header.nm_flags.trunc)
1353                 state->flags |= NM_FLAGS_TC;
1354         if (nmb->header.nm_flags.recursion_desired)
1355                 state->flags |= NM_FLAGS_RD;
1356         if (nmb->header.nm_flags.recursion_available)
1357                 state->flags |= NM_FLAGS_RA;
1358         if (nmb->header.nm_flags.bcast)
1359                 state->flags |= NM_FLAGS_B;
1360
1361         if (state->bcast) {
1362                 /*
1363                  * We have to collect all entries coming in from
1364                  * broadcast queries
1365                  */
1366                 return false;
1367         }
1368         /*
1369          * WINS responses are accepted when they are received
1370          */
1371         return true;
1372 }
1373
1374 static void name_query_done(struct tevent_req *subreq)
1375 {
1376         struct tevent_req *req = tevent_req_callback_data(
1377                 subreq, struct tevent_req);
1378         struct name_query_state *state = tevent_req_data(
1379                 req, struct name_query_state);
1380         NTSTATUS status;
1381         struct packet_struct *p = NULL;
1382
1383         status = nb_trans_recv(subreq, &p);
1384         TALLOC_FREE(subreq);
1385         if (tevent_req_nterror(req, status)) {
1386                 return;
1387         }
1388         if (!NT_STATUS_IS_OK(state->validate_error)) {
1389                 tevent_req_nterror(req, state->validate_error);
1390                 return;
1391         }
1392         if (p != NULL) {
1393                 /*
1394                  * Free the packet here, we've collected the response in the
1395                  * validator
1396                  */
1397                 free_packet(p);
1398         }
1399         tevent_req_done(req);
1400 }
1401
1402 NTSTATUS name_query_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
1403                          struct sockaddr_storage **addrs, int *num_addrs,
1404                          uint8_t *flags)
1405 {
1406         struct name_query_state *state = tevent_req_data(
1407                 req, struct name_query_state);
1408         NTSTATUS status;
1409
1410         if (tevent_req_is_nterror(req, &status)
1411             && !NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
1412                 return status;
1413         }
1414         if (state->num_addrs == 0) {
1415                 return NT_STATUS_NOT_FOUND;
1416         }
1417         *addrs = talloc_move(mem_ctx, &state->addrs);
1418         sort_addr_list(*addrs, state->num_addrs);
1419         *num_addrs = state->num_addrs;
1420         if (flags != NULL) {
1421                 *flags = state->flags;
1422         }
1423         return NT_STATUS_OK;
1424 }
1425
1426 NTSTATUS name_query(const char *name, int name_type,
1427                     bool bcast, bool recurse,
1428                     const struct sockaddr_storage *to_ss,
1429                     TALLOC_CTX *mem_ctx,
1430                     struct sockaddr_storage **addrs,
1431                     int *num_addrs, uint8_t *flags)
1432 {
1433         TALLOC_CTX *frame = talloc_stackframe();
1434         struct tevent_context *ev;
1435         struct tevent_req *req;
1436         NTSTATUS status = NT_STATUS_NO_MEMORY;
1437
1438         ev = tevent_context_init(frame);
1439         if (ev == NULL) {
1440                 goto fail;
1441         }
1442         req = name_query_send(ev, ev, name, name_type, bcast, recurse, to_ss);
1443         if (req == NULL) {
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         struct sockaddr_storage ss;
1498         NTSTATUS status = NT_STATUS_NOT_FOUND;
1499
1500         if (lp_disable_netbios()) {
1501                 DEBUG(5,("name_resolve_bcast(%s#%02x): netbios is disabled\n",
1502                                         name, name_type));
1503                 return NT_STATUS_INVALID_PARAMETER;
1504         }
1505
1506         *return_iplist = NULL;
1507         *return_count = 0;
1508
1509         /*
1510          * "bcast" means do a broadcast lookup on all the local interfaces.
1511          */
1512
1513         DEBUG(3,("name_resolve_bcast: Attempting broadcast lookup "
1514                 "for name %s<0x%x>\n", name, name_type));
1515
1516         if (!interpret_string_addr(&ss, lp_socket_address(),
1517                                 AI_NUMERICHOST|AI_PASSIVE)) {
1518                 zero_sockaddr(&ss);
1519         }
1520
1521         /*
1522          * Lookup the name on all the interfaces, return on
1523          * the first successful match.
1524          */
1525         for( i = num_interfaces-1; i >= 0; i--) {
1526                 const struct sockaddr_storage *pss = iface_n_bcast(i);
1527
1528                 /* Done this way to fix compiler error on IRIX 5.x */
1529                 if (!pss) {
1530                         continue;
1531                 }
1532                 status = name_query(name, name_type, true, true, pss,
1533                                     talloc_tos(), &ss_list, return_count,
1534                                     NULL);
1535                 if (NT_STATUS_IS_OK(status)) {
1536                         goto success;
1537                 }
1538         }
1539
1540         /* failed - no response */
1541
1542         return status;
1543
1544 success:
1545
1546         if (!convert_ss2service(return_iplist, ss_list, *return_count) )
1547                 status = NT_STATUS_NO_MEMORY;
1548
1549         TALLOC_FREE(ss_list);
1550         return status;
1551 }
1552
1553 /********************************************************
1554  Resolve via "wins" method.
1555 *********************************************************/
1556
1557 NTSTATUS resolve_wins(const char *name,
1558                 int name_type,
1559                 struct ip_service **return_iplist,
1560                 int *return_count)
1561 {
1562         int t, i;
1563         char **wins_tags;
1564         struct sockaddr_storage src_ss, *ss_list = NULL;
1565         struct in_addr src_ip;
1566         NTSTATUS status;
1567
1568         if (lp_disable_netbios()) {
1569                 DEBUG(5,("resolve_wins(%s#%02x): netbios is disabled\n",
1570                                         name, name_type));
1571                 return NT_STATUS_INVALID_PARAMETER;
1572         }
1573
1574         *return_iplist = NULL;
1575         *return_count = 0;
1576
1577         DEBUG(3,("resolve_wins: Attempting wins lookup for name %s<0x%x>\n",
1578                                 name, name_type));
1579
1580         if (wins_srv_count() < 1) {
1581                 DEBUG(3,("resolve_wins: WINS server resolution selected "
1582                         "and no WINS servers listed.\n"));
1583                 return NT_STATUS_INVALID_PARAMETER;
1584         }
1585
1586         /* we try a lookup on each of the WINS tags in turn */
1587         wins_tags = wins_srv_tags();
1588
1589         if (!wins_tags) {
1590                 /* huh? no tags?? give up in disgust */
1591                 return NT_STATUS_INVALID_PARAMETER;
1592         }
1593
1594         /* the address we will be sending from */
1595         if (!interpret_string_addr(&src_ss, lp_socket_address(),
1596                                 AI_NUMERICHOST|AI_PASSIVE)) {
1597                 zero_sockaddr(&src_ss);
1598         }
1599
1600         if (src_ss.ss_family != AF_INET) {
1601                 char addr[INET6_ADDRSTRLEN];
1602                 print_sockaddr(addr, sizeof(addr), &src_ss);
1603                 DEBUG(3,("resolve_wins: cannot receive WINS replies "
1604                         "on IPv6 address %s\n",
1605                         addr));
1606                 wins_srv_tags_free(wins_tags);
1607                 return NT_STATUS_INVALID_PARAMETER;
1608         }
1609
1610         src_ip = ((struct sockaddr_in *)&src_ss)->sin_addr;
1611
1612         /* in the worst case we will try every wins server with every
1613            tag! */
1614         for (t=0; wins_tags && wins_tags[t]; t++) {
1615                 int srv_count = wins_srv_count_tag(wins_tags[t]);
1616                 for (i=0; i<srv_count; i++) {
1617                         struct sockaddr_storage wins_ss;
1618                         struct in_addr wins_ip;
1619
1620                         wins_ip = wins_srv_ip_tag(wins_tags[t], src_ip);
1621
1622                         if (global_in_nmbd && ismyip_v4(wins_ip)) {
1623                                 /* yikes! we'll loop forever */
1624                                 continue;
1625                         }
1626
1627                         /* skip any that have been unresponsive lately */
1628                         if (wins_srv_is_dead(wins_ip, src_ip)) {
1629                                 continue;
1630                         }
1631
1632                         DEBUG(3,("resolve_wins: using WINS server %s "
1633                                 "and tag '%s'\n",
1634                                 inet_ntoa(wins_ip), wins_tags[t]));
1635
1636                         in_addr_to_sockaddr_storage(&wins_ss, wins_ip);
1637                         status = name_query(name,
1638                                                 name_type,
1639                                                 false,
1640                                                 true,
1641                                                 &wins_ss,
1642                                                 talloc_tos(),
1643                                                 &ss_list,
1644                                                 return_count,
1645                                                 NULL);
1646
1647                         /* exit loop if we got a list of addresses */
1648
1649                         if (NT_STATUS_IS_OK(status)) {
1650                                 goto success;
1651                         }
1652
1653                         if (NT_STATUS_EQUAL(status,
1654                                             NT_STATUS_IO_TIMEOUT)) {
1655                                 /* Timed out waiting for WINS server to
1656                                  * respond.
1657                                  * Mark it dead. */
1658                                 wins_srv_died(wins_ip, src_ip);
1659                         } else {
1660                                 /* The name definitely isn't in this
1661                                    group of WINS servers.
1662                                    goto the next group  */
1663                                 break;
1664                         }
1665                 }
1666         }
1667
1668         wins_srv_tags_free(wins_tags);
1669         return NT_STATUS_NO_LOGON_SERVERS;
1670
1671 success:
1672
1673         status = NT_STATUS_OK;
1674         if (!convert_ss2service(return_iplist, ss_list, *return_count))
1675                 status = NT_STATUS_INVALID_PARAMETER;
1676
1677         TALLOC_FREE(ss_list);
1678         wins_srv_tags_free(wins_tags);
1679
1680         return status;
1681 }
1682
1683 /********************************************************
1684  Resolve via "lmhosts" method.
1685 *********************************************************/
1686
1687 static NTSTATUS resolve_lmhosts(const char *name, int name_type,
1688                                 struct ip_service **return_iplist,
1689                                 int *return_count)
1690 {
1691         /*
1692          * "lmhosts" means parse the local lmhosts file.
1693          */
1694         struct sockaddr_storage *ss_list;
1695         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1696         TALLOC_CTX *ctx = NULL;
1697
1698         *return_iplist = NULL;
1699         *return_count = 0;
1700
1701         DEBUG(3,("resolve_lmhosts: "
1702                 "Attempting lmhosts lookup for name %s<0x%x>\n",
1703                 name, name_type));
1704
1705         ctx = talloc_init("resolve_lmhosts");
1706         if (!ctx) {
1707                 return NT_STATUS_NO_MEMORY;
1708         }
1709
1710         status = resolve_lmhosts_file_as_sockaddr(get_dyn_LMHOSTSFILE(),
1711                                                   name, name_type,
1712                                                   ctx,
1713                                                   &ss_list,
1714                                                   return_count);
1715         if (NT_STATUS_IS_OK(status)) {
1716                 if (convert_ss2service(return_iplist,
1717                                        ss_list,
1718                                        *return_count)) {
1719                         talloc_free(ctx);
1720                         return NT_STATUS_OK;
1721                 } else {
1722                         talloc_free(ctx);
1723                         return NT_STATUS_NO_MEMORY;
1724                 }
1725         }
1726         talloc_free(ctx);
1727         return status;
1728 }
1729
1730
1731 /********************************************************
1732  Resolve via "hosts" method.
1733 *********************************************************/
1734
1735 static NTSTATUS resolve_hosts(const char *name, int name_type,
1736                               struct ip_service **return_iplist,
1737                               int *return_count)
1738 {
1739         /*
1740          * "host" means do a localhost, or dns lookup.
1741          */
1742         struct addrinfo hints;
1743         struct addrinfo *ailist = NULL;
1744         struct addrinfo *res = NULL;
1745         int ret = -1;
1746         int i = 0;
1747
1748         if ( name_type != 0x20 && name_type != 0x0) {
1749                 DEBUG(5, ("resolve_hosts: not appropriate "
1750                         "for name type <0x%x>\n",
1751                         name_type));
1752                 return NT_STATUS_INVALID_PARAMETER;
1753         }
1754
1755         *return_iplist = NULL;
1756         *return_count = 0;
1757
1758         DEBUG(3,("resolve_hosts: Attempting host lookup for name %s<0x%x>\n",
1759                                 name, name_type));
1760
1761         ZERO_STRUCT(hints);
1762         /* By default make sure it supports TCP. */
1763         hints.ai_socktype = SOCK_STREAM;
1764         hints.ai_flags = AI_ADDRCONFIG;
1765
1766 #if !defined(HAVE_IPV6)
1767         /* Unless we have IPv6, we really only want IPv4 addresses back. */
1768         hints.ai_family = AF_INET;
1769 #endif
1770
1771         ret = getaddrinfo(name,
1772                         NULL,
1773                         &hints,
1774                         &ailist);
1775         if (ret) {
1776                 DEBUG(3,("resolve_hosts: getaddrinfo failed for name %s [%s]\n",
1777                         name,
1778                         gai_strerror(ret) ));
1779         }
1780
1781         for (res = ailist; res; res = res->ai_next) {
1782                 struct sockaddr_storage ss;
1783
1784                 if (!res->ai_addr || res->ai_addrlen == 0) {
1785                         continue;
1786                 }
1787
1788                 ZERO_STRUCT(ss);
1789                 memcpy(&ss, res->ai_addr, res->ai_addrlen);
1790
1791                 *return_count += 1;
1792
1793                 *return_iplist = SMB_REALLOC_ARRAY(*return_iplist,
1794                                                 struct ip_service,
1795                                                 *return_count);
1796                 if (!*return_iplist) {
1797                         DEBUG(3,("resolve_hosts: malloc fail !\n"));
1798                         freeaddrinfo(ailist);
1799                         return NT_STATUS_NO_MEMORY;
1800                 }
1801                 (*return_iplist)[i].ss = ss;
1802                 (*return_iplist)[i].port = PORT_NONE;
1803                 i++;
1804         }
1805         if (ailist) {
1806                 freeaddrinfo(ailist);
1807         }
1808         if (*return_count) {
1809                 return NT_STATUS_OK;
1810         }
1811         return NT_STATUS_UNSUCCESSFUL;
1812 }
1813
1814 /********************************************************
1815  Resolve via "ADS" method.
1816 *********************************************************/
1817
1818 static NTSTATUS resolve_ads(const char *name,
1819                             int name_type,
1820                             const char *sitename,
1821                             struct ip_service **return_iplist,
1822                             int *return_count)
1823 {
1824         int                     i, j;
1825         NTSTATUS                status;
1826         TALLOC_CTX              *ctx;
1827         struct dns_rr_srv       *dcs = NULL;
1828         int                     numdcs = 0;
1829         int                     numaddrs = 0;
1830
1831         if ((name_type != 0x1c) && (name_type != KDC_NAME_TYPE) &&
1832             (name_type != 0x1b)) {
1833                 return NT_STATUS_INVALID_PARAMETER;
1834         }
1835
1836         if ( (ctx = talloc_init("resolve_ads")) == NULL ) {
1837                 DEBUG(0,("resolve_ads: talloc_init() failed!\n"));
1838                 return NT_STATUS_NO_MEMORY;
1839         }
1840
1841         /* The DNS code needs fixing to find IPv6 addresses... JRA. */
1842
1843         switch (name_type) {
1844                 case 0x1b:
1845                         DEBUG(5,("resolve_ads: Attempting to resolve "
1846                                  "PDC for %s using DNS\n", name));
1847                         status = ads_dns_query_pdc(ctx, name, &dcs, &numdcs);
1848                         break;
1849
1850                 case 0x1c:
1851                         DEBUG(5,("resolve_ads: Attempting to resolve "
1852                                  "DCs for %s using DNS\n", name));
1853                         status = ads_dns_query_dcs(ctx, name, sitename, &dcs,
1854                                                    &numdcs);
1855                         break;
1856                 case KDC_NAME_TYPE:
1857                         DEBUG(5,("resolve_ads: Attempting to resolve "
1858                                  "KDCs for %s using DNS\n", name));
1859                         status = ads_dns_query_kdcs(ctx, name, sitename, &dcs,
1860                                                     &numdcs);
1861                         break;
1862                 default:
1863                         status = NT_STATUS_INVALID_PARAMETER;
1864                         break;
1865         }
1866
1867         if ( !NT_STATUS_IS_OK( status ) ) {
1868                 talloc_destroy(ctx);
1869                 return status;
1870         }
1871
1872         for (i=0;i<numdcs;i++) {
1873                 numaddrs += MAX(dcs[i].num_ips,1);
1874         }
1875
1876         if ((*return_iplist = SMB_MALLOC_ARRAY(struct ip_service, numaddrs)) ==
1877                         NULL ) {
1878                 DEBUG(0,("resolve_ads: malloc failed for %d entries\n",
1879                                         numaddrs ));
1880                 talloc_destroy(ctx);
1881                 return NT_STATUS_NO_MEMORY;
1882         }
1883
1884         /* now unroll the list of IP addresses */
1885
1886         *return_count = 0;
1887         i = 0;
1888         j = 0;
1889         while ( i < numdcs && (*return_count<numaddrs) ) {
1890                 struct ip_service *r = &(*return_iplist)[*return_count];
1891
1892                 r->port = dcs[i].port;
1893
1894                 /* If we don't have an IP list for a name, lookup it up */
1895
1896                 if (!dcs[i].ss_s) {
1897                         interpret_string_addr(&r->ss, dcs[i].hostname, 0);
1898                         i++;
1899                         j = 0;
1900                 } else {
1901                         /* use the IP addresses from the SRV sresponse */
1902
1903                         if ( j >= dcs[i].num_ips ) {
1904                                 i++;
1905                                 j = 0;
1906                                 continue;
1907                         }
1908
1909                         r->ss = dcs[i].ss_s[j];
1910                         j++;
1911                 }
1912
1913                 /* make sure it is a valid IP.  I considered checking the
1914                  * negative connection cache, but this is the wrong place
1915                  * for it. Maybe only as a hack. After think about it, if
1916                  * all of the IP addresses returned from DNS are dead, what
1917                  * hope does a netbios name lookup have ? The standard reason
1918                  * for falling back to netbios lookups is that our DNS server
1919                  * doesn't know anything about the DC's   -- jerry */
1920
1921                 if (!is_zero_addr((struct sockaddr *)&r->ss)) {
1922                         (*return_count)++;
1923                 }
1924         }
1925
1926         talloc_destroy(ctx);
1927         return NT_STATUS_OK;
1928 }
1929
1930 /*******************************************************************
1931  Internal interface to resolve a name into an IP address.
1932  Use this function if the string is either an IP address, DNS
1933  or host name or NetBIOS name. This uses the name switch in the
1934  smb.conf to determine the order of name resolution.
1935
1936  Added support for ip addr/port to support ADS ldap servers.
1937  the only place we currently care about the port is in the
1938  resolve_hosts() when looking up DC's via SRV RR entries in DNS
1939 **********************************************************************/
1940
1941 NTSTATUS internal_resolve_name(const char *name,
1942                                 int name_type,
1943                                 const char *sitename,
1944                                 struct ip_service **return_iplist,
1945                                 int *return_count,
1946                                 const char *resolve_order)
1947 {
1948         char *tok;
1949         const char *ptr;
1950         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
1951         int i;
1952         TALLOC_CTX *frame = NULL;
1953
1954         *return_iplist = NULL;
1955         *return_count = 0;
1956
1957         DEBUG(10, ("internal_resolve_name: looking up %s#%x (sitename %s)\n",
1958                         name, name_type, sitename ? sitename : "(null)"));
1959
1960         if (is_ipaddress(name)) {
1961                 if ((*return_iplist = SMB_MALLOC_P(struct ip_service)) ==
1962                                 NULL) {
1963                         DEBUG(0,("internal_resolve_name: malloc fail !\n"));
1964                         return NT_STATUS_NO_MEMORY;
1965                 }
1966
1967                 /* ignore the port here */
1968                 (*return_iplist)->port = PORT_NONE;
1969
1970                 /* if it's in the form of an IP address then get the lib to interpret it */
1971                 if (!interpret_string_addr(&(*return_iplist)->ss,
1972                                         name, AI_NUMERICHOST)) {
1973                         DEBUG(1,("internal_resolve_name: interpret_string_addr "
1974                                 "failed on %s\n",
1975                                 name));
1976                         SAFE_FREE(*return_iplist);
1977                         return NT_STATUS_INVALID_PARAMETER;
1978                 }
1979                 *return_count = 1;
1980                 return NT_STATUS_OK;
1981         }
1982
1983         /* Check name cache */
1984
1985         if (namecache_fetch(name, name_type, return_iplist, return_count)) {
1986                 /* This could be a negative response */
1987                 if (*return_count > 0) {
1988                         return NT_STATUS_OK;
1989                 } else {
1990                         return NT_STATUS_UNSUCCESSFUL;
1991                 }
1992         }
1993
1994         /* set the name resolution order */
1995
1996         if (strcmp( resolve_order, "NULL") == 0) {
1997                 DEBUG(8,("internal_resolve_name: all lookups disabled\n"));
1998                 return NT_STATUS_INVALID_PARAMETER;
1999         }
2000
2001         if (!resolve_order[0]) {
2002                 ptr = "host";
2003         } else {
2004                 ptr = resolve_order;
2005         }
2006
2007         /* iterate through the name resolution backends */
2008
2009         frame = talloc_stackframe();
2010         while (next_token_talloc(frame, &ptr, &tok, LIST_SEP)) {
2011                 if((strequal(tok, "host") || strequal(tok, "hosts"))) {
2012                         status = resolve_hosts(name, name_type, return_iplist,
2013                                                return_count);
2014                         if (NT_STATUS_IS_OK(status)) {
2015                                 goto done;
2016                         }
2017                 } else if(strequal( tok, "kdc")) {
2018                         /* deal with KDC_NAME_TYPE names here.
2019                          * This will result in a SRV record lookup */
2020                         status = resolve_ads(name, KDC_NAME_TYPE, sitename,
2021                                              return_iplist, return_count);
2022                         if (NT_STATUS_IS_OK(status)) {
2023                                 /* Ensure we don't namecache
2024                                  * this with the KDC port. */
2025                                 name_type = KDC_NAME_TYPE;
2026                                 goto done;
2027                         }
2028                 } else if(strequal( tok, "ads")) {
2029                         /* deal with 0x1c and 0x1b names here.
2030                          * This will result in a SRV record lookup */
2031                         status = resolve_ads(name, name_type, sitename,
2032                                              return_iplist, return_count);
2033                         if (NT_STATUS_IS_OK(status)) {
2034                                 goto done;
2035                         }
2036                 } else if(strequal( tok, "lmhosts")) {
2037                         status = resolve_lmhosts(name, name_type,
2038                                                  return_iplist, return_count);
2039                         if (NT_STATUS_IS_OK(status)) {
2040                                 goto done;
2041                         }
2042                 } else if(strequal( tok, "wins")) {
2043                         /* don't resolve 1D via WINS */
2044                         if (name_type != 0x1D) {
2045                                 status = resolve_wins(name, name_type,
2046                                                       return_iplist,
2047                                                       return_count);
2048                                 if (NT_STATUS_IS_OK(status)) {
2049                                         goto done;
2050                                 }
2051                         }
2052                 } else if(strequal( tok, "bcast")) {
2053                         status = name_resolve_bcast(name, name_type,
2054                                                     return_iplist,
2055                                                     return_count);
2056                         if (NT_STATUS_IS_OK(status)) {
2057                                 goto done;
2058                         }
2059                 } else {
2060                         DEBUG(0,("resolve_name: unknown name switch type %s\n",
2061                                 tok));
2062                 }
2063         }
2064
2065         /* All of the resolve_* functions above have returned false. */
2066
2067         TALLOC_FREE(frame);
2068         SAFE_FREE(*return_iplist);
2069         *return_count = 0;
2070
2071         return NT_STATUS_UNSUCCESSFUL;
2072
2073   done:
2074
2075         /* Remove duplicate entries.  Some queries, notably #1c (domain
2076         controllers) return the PDC in iplist[0] and then all domain
2077         controllers including the PDC in iplist[1..n].  Iterating over
2078         the iplist when the PDC is down will cause two sets of timeouts. */
2079
2080         if ( *return_count ) {
2081                 *return_count = remove_duplicate_addrs2(*return_iplist,
2082                                         *return_count );
2083         }
2084
2085         /* Save in name cache */
2086         if ( DEBUGLEVEL >= 100 ) {
2087                 for (i = 0; i < *return_count && DEBUGLEVEL == 100; i++) {
2088                         char addr[INET6_ADDRSTRLEN];
2089                         print_sockaddr(addr, sizeof(addr),
2090                                         &(*return_iplist)[i].ss);
2091                         DEBUG(100, ("Storing name %s of type %d (%s:%d)\n",
2092                                         name,
2093                                         name_type,
2094                                         addr,
2095                                         (*return_iplist)[i].port));
2096                 }
2097         }
2098
2099         namecache_store(name, name_type, *return_count, *return_iplist);
2100
2101         /* Display some debugging info */
2102
2103         if ( DEBUGLEVEL >= 10 ) {
2104                 DEBUG(10, ("internal_resolve_name: returning %d addresses: ",
2105                                         *return_count));
2106
2107                 for (i = 0; i < *return_count; i++) {
2108                         char addr[INET6_ADDRSTRLEN];
2109                         print_sockaddr(addr, sizeof(addr),
2110                                         &(*return_iplist)[i].ss);
2111                         DEBUGADD(10, ("%s:%d ",
2112                                         addr,
2113                                         (*return_iplist)[i].port));
2114                 }
2115                 DEBUG(10, ("\n"));
2116         }
2117
2118         TALLOC_FREE(frame);
2119         return status;
2120 }
2121
2122 /********************************************************
2123  Internal interface to resolve a name into one IP address.
2124  Use this function if the string is either an IP address, DNS
2125  or host name or NetBIOS name. This uses the name switch in the
2126  smb.conf to determine the order of name resolution.
2127 *********************************************************/
2128
2129 bool resolve_name(const char *name,
2130                 struct sockaddr_storage *return_ss,
2131                 int name_type,
2132                 bool prefer_ipv4)
2133 {
2134         struct ip_service *ss_list = NULL;
2135         char *sitename = NULL;
2136         int count = 0;
2137
2138         if (is_ipaddress(name)) {
2139                 return interpret_string_addr(return_ss, name, AI_NUMERICHOST);
2140         }
2141
2142         sitename = sitename_fetch(lp_realm()); /* wild guess */
2143
2144         if (NT_STATUS_IS_OK(internal_resolve_name(name, name_type, sitename,
2145                                                   &ss_list, &count,
2146                                                   lp_name_resolve_order()))) {
2147                 int i;
2148
2149                 if (prefer_ipv4) {
2150                         for (i=0; i<count; i++) {
2151                                 if (!is_zero_addr((struct sockaddr *)&ss_list[i].ss) &&
2152                                                 !is_broadcast_addr((struct sockaddr *)&ss_list[i].ss) &&
2153                                                 (ss_list[i].ss.ss_family == AF_INET)) {
2154                                         *return_ss = ss_list[i].ss;
2155                                         SAFE_FREE(ss_list);
2156                                         SAFE_FREE(sitename);
2157                                         return True;
2158                                 }
2159                         }
2160                 }
2161
2162                 /* only return valid addresses for TCP connections */
2163                 for (i=0; i<count; i++) {
2164                         if (!is_zero_addr((struct sockaddr *)&ss_list[i].ss) &&
2165                                         !is_broadcast_addr((struct sockaddr *)&ss_list[i].ss)) {
2166                                 *return_ss = ss_list[i].ss;
2167                                 SAFE_FREE(ss_list);
2168                                 SAFE_FREE(sitename);
2169                                 return True;
2170                         }
2171                 }
2172         }
2173
2174         SAFE_FREE(ss_list);
2175         SAFE_FREE(sitename);
2176         return False;
2177 }
2178
2179 /********************************************************
2180  Internal interface to resolve a name into a list of IP addresses.
2181  Use this function if the string is either an IP address, DNS
2182  or host name or NetBIOS name. This uses the name switch in the
2183  smb.conf to determine the order of name resolution.
2184 *********************************************************/
2185
2186 NTSTATUS resolve_name_list(TALLOC_CTX *ctx,
2187                 const char *name,
2188                 int name_type,
2189                 struct sockaddr_storage **return_ss_arr,
2190                 unsigned int *p_num_entries)
2191 {
2192         struct ip_service *ss_list = NULL;
2193         char *sitename = NULL;
2194         int count = 0;
2195         int i;
2196         unsigned int num_entries;
2197         NTSTATUS status;
2198
2199         *p_num_entries = 0;
2200         *return_ss_arr = NULL;
2201
2202         if (is_ipaddress(name)) {
2203                 *return_ss_arr = TALLOC_P(ctx, struct sockaddr_storage);
2204                 if (!*return_ss_arr) {
2205                         return NT_STATUS_NO_MEMORY;
2206                 }
2207                 if (!interpret_string_addr(*return_ss_arr, name, AI_NUMERICHOST)) {
2208                         TALLOC_FREE(*return_ss_arr);
2209                         return NT_STATUS_BAD_NETWORK_NAME;
2210                 }
2211                 *p_num_entries = 1;
2212                 return NT_STATUS_OK;
2213         }
2214
2215         sitename = sitename_fetch(lp_realm()); /* wild guess */
2216
2217         status = internal_resolve_name(name, name_type, sitename,
2218                                                   &ss_list, &count,
2219                                                   lp_name_resolve_order());
2220         SAFE_FREE(sitename);
2221
2222         if (!NT_STATUS_IS_OK(status)) {
2223                 return status;
2224         }
2225
2226         /* only return valid addresses for TCP connections */
2227         for (i=0, num_entries = 0; i<count; i++) {
2228                 if (!is_zero_addr((struct sockaddr *)&ss_list[i].ss) &&
2229                                 !is_broadcast_addr((struct sockaddr *)&ss_list[i].ss)) {
2230                         num_entries++;
2231                 }
2232         }
2233         if (num_entries == 0) {
2234                 SAFE_FREE(ss_list);
2235                 return NT_STATUS_BAD_NETWORK_NAME;
2236         }
2237
2238         *return_ss_arr = TALLOC_ARRAY(ctx,
2239                                 struct sockaddr_storage,
2240                                 num_entries);
2241         if (!(*return_ss_arr)) {
2242                 SAFE_FREE(ss_list);
2243                 return NT_STATUS_NO_MEMORY;
2244         }
2245
2246         for (i=0, num_entries = 0; i<count; i++) {
2247                 if (!is_zero_addr((struct sockaddr *)&ss_list[i].ss) &&
2248                                 !is_broadcast_addr((struct sockaddr *)&ss_list[i].ss)) {
2249                         (*return_ss_arr)[num_entries++] = ss_list[i].ss;
2250                 }
2251         }
2252
2253         status = NT_STATUS_OK;
2254         *p_num_entries = num_entries;
2255
2256         SAFE_FREE(ss_list);
2257         return NT_STATUS_OK;
2258 }
2259
2260 /********************************************************
2261  Find the IP address of the master browser or DMB for a workgroup.
2262 *********************************************************/
2263
2264 bool find_master_ip(const char *group, struct sockaddr_storage *master_ss)
2265 {
2266         struct ip_service *ip_list = NULL;
2267         int count = 0;
2268         NTSTATUS status;
2269
2270         if (lp_disable_netbios()) {
2271                 DEBUG(5,("find_master_ip(%s): netbios is disabled\n", group));
2272                 return false;
2273         }
2274
2275         status = internal_resolve_name(group, 0x1D, NULL, &ip_list, &count,
2276                                        lp_name_resolve_order());
2277         if (NT_STATUS_IS_OK(status)) {
2278                 *master_ss = ip_list[0].ss;
2279                 SAFE_FREE(ip_list);
2280                 return true;
2281         }
2282
2283         status = internal_resolve_name(group, 0x1B, NULL, &ip_list, &count,
2284                                        lp_name_resolve_order());
2285         if (NT_STATUS_IS_OK(status)) {
2286                 *master_ss = ip_list[0].ss;
2287                 SAFE_FREE(ip_list);
2288                 return true;
2289         }
2290
2291         SAFE_FREE(ip_list);
2292         return false;
2293 }
2294
2295 /********************************************************
2296  Get the IP address list of the primary domain controller
2297  for a domain.
2298 *********************************************************/
2299
2300 bool get_pdc_ip(const char *domain, struct sockaddr_storage *pss)
2301 {
2302         struct ip_service *ip_list = NULL;
2303         int count = 0;
2304         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
2305
2306         /* Look up #1B name */
2307
2308         if (lp_security() == SEC_ADS) {
2309                 status = internal_resolve_name(domain, 0x1b, NULL, &ip_list,
2310                                                &count, "ads");
2311         }
2312
2313         if (!NT_STATUS_IS_OK(status) || count == 0) {
2314                 status = internal_resolve_name(domain, 0x1b, NULL, &ip_list,
2315                                                &count,
2316                                                lp_name_resolve_order());
2317                 if (!NT_STATUS_IS_OK(status)) {
2318                         return false;
2319                 }
2320         }
2321
2322         /* if we get more than 1 IP back we have to assume it is a
2323            multi-homed PDC and not a mess up */
2324
2325         if ( count > 1 ) {
2326                 DEBUG(6,("get_pdc_ip: PDC has %d IP addresses!\n", count));
2327                 sort_service_list(ip_list, count);
2328         }
2329
2330         *pss = ip_list[0].ss;
2331         SAFE_FREE(ip_list);
2332         return true;
2333 }
2334
2335 /* Private enum type for lookups. */
2336
2337 enum dc_lookup_type { DC_NORMAL_LOOKUP, DC_ADS_ONLY, DC_KDC_ONLY };
2338
2339 /********************************************************
2340  Get the IP address list of the domain controllers for
2341  a domain.
2342 *********************************************************/
2343
2344 static NTSTATUS get_dc_list(const char *domain,
2345                         const char *sitename,
2346                         struct ip_service **ip_list,
2347                         int *count,
2348                         enum dc_lookup_type lookup_type,
2349                         bool *ordered)
2350 {
2351         char *resolve_order = NULL;
2352         char *saf_servername = NULL;
2353         char *pserver = NULL;
2354         const char *p;
2355         char *port_str = NULL;
2356         int port;
2357         char *name;
2358         int num_addresses = 0;
2359         int  local_count, i, j;
2360         struct ip_service *return_iplist = NULL;
2361         struct ip_service *auto_ip_list = NULL;
2362         bool done_auto_lookup = false;
2363         int auto_count = 0;
2364         NTSTATUS status;
2365         TALLOC_CTX *ctx = talloc_init("get_dc_list");
2366
2367         *ip_list = NULL;
2368         *count = 0;
2369
2370         if (!ctx) {
2371                 return NT_STATUS_NO_MEMORY;
2372         }
2373
2374         *ordered = False;
2375
2376         /* if we are restricted to solely using DNS for looking
2377            up a domain controller, make sure that host lookups
2378            are enabled for the 'name resolve order'.  If host lookups
2379            are disabled and ads_only is True, then set the string to
2380            NULL. */
2381
2382         resolve_order = talloc_strdup(ctx, lp_name_resolve_order());
2383         if (!resolve_order) {
2384                 status = NT_STATUS_NO_MEMORY;
2385                 goto out;
2386         }
2387         strlower_m(resolve_order);
2388         if (lookup_type == DC_ADS_ONLY)  {
2389                 if (strstr( resolve_order, "host")) {
2390                         resolve_order = talloc_strdup(ctx, "ads");
2391
2392                         /* DNS SRV lookups used by the ads resolver
2393                            are already sorted by priority and weight */
2394                         *ordered = true;
2395                 } else {
2396                         resolve_order = talloc_strdup(ctx, "NULL");
2397                 }
2398         } else if (lookup_type == DC_KDC_ONLY) {
2399                 /* DNS SRV lookups used by the ads/kdc resolver
2400                    are already sorted by priority and weight */
2401                 *ordered = true;
2402                 resolve_order = talloc_strdup(ctx, "kdc");
2403         }
2404         if (!resolve_order) {
2405                 status = NT_STATUS_NO_MEMORY;
2406                 goto out;
2407         }
2408
2409         /* fetch the server we have affinity for.  Add the
2410            'password server' list to a search for our domain controllers */
2411
2412         saf_servername = saf_fetch( domain);
2413
2414         if (strequal(domain, lp_workgroup()) || strequal(domain, lp_realm())) {
2415                 pserver = talloc_asprintf(ctx, "%s, %s",
2416                         saf_servername ? saf_servername : "",
2417                         lp_passwordserver());
2418         } else {
2419                 pserver = talloc_asprintf(ctx, "%s, *",
2420                         saf_servername ? saf_servername : "");
2421         }
2422
2423         SAFE_FREE(saf_servername);
2424         if (!pserver) {
2425                 status = NT_STATUS_NO_MEMORY;
2426                 goto out;
2427         }
2428
2429         /* if we are starting from scratch, just lookup DOMAIN<0x1c> */
2430
2431         if (!*pserver ) {
2432                 DEBUG(10,("get_dc_list: no preferred domain controllers.\n"));
2433                 status = internal_resolve_name(domain, 0x1C, sitename, ip_list,
2434                                              count, resolve_order);
2435                 goto out;
2436         }
2437
2438         DEBUG(3,("get_dc_list: preferred server list: \"%s\"\n", pserver ));
2439
2440         /*
2441          * if '*' appears in the "password server" list then add
2442          * an auto lookup to the list of manually configured
2443          * DC's.  If any DC is listed by name, then the list should be
2444          * considered to be ordered
2445          */
2446
2447         p = pserver;
2448         while (next_token_talloc(ctx, &p, &name, LIST_SEP)) {
2449                 if (!done_auto_lookup && strequal(name, "*")) {
2450                         status = internal_resolve_name(domain, 0x1C, sitename,
2451                                                        &auto_ip_list,
2452                                                        &auto_count,
2453                                                        resolve_order);
2454                         if (NT_STATUS_IS_OK(status)) {
2455                                 num_addresses += auto_count;
2456                         }
2457                         done_auto_lookup = true;
2458                         DEBUG(8,("Adding %d DC's from auto lookup\n",
2459                                                 auto_count));
2460                 } else  {
2461                         num_addresses++;
2462                 }
2463         }
2464
2465         /* if we have no addresses and haven't done the auto lookup, then
2466            just return the list of DC's.  Or maybe we just failed. */
2467
2468         if ((num_addresses == 0)) {
2469                 if (done_auto_lookup) {
2470                         DEBUG(4,("get_dc_list: no servers found\n"));
2471                         status = NT_STATUS_NO_LOGON_SERVERS;
2472                         goto out;
2473                 }
2474                 status = internal_resolve_name(domain, 0x1C, sitename, ip_list,
2475                                              count, resolve_order);
2476                 goto out;
2477         }
2478
2479         if ((return_iplist = SMB_MALLOC_ARRAY(struct ip_service,
2480                                         num_addresses)) == NULL) {
2481                 DEBUG(3,("get_dc_list: malloc fail !\n"));
2482                 status = NT_STATUS_NO_MEMORY;
2483                 goto out;
2484         }
2485
2486         p = pserver;
2487         local_count = 0;
2488
2489         /* fill in the return list now with real IP's */
2490
2491         while ((local_count<num_addresses) &&
2492                         next_token_talloc(ctx, &p, &name, LIST_SEP)) {
2493                 struct sockaddr_storage name_ss;
2494
2495                 /* copy any addersses from the auto lookup */
2496
2497                 if (strequal(name, "*")) {
2498                         for (j=0; j<auto_count; j++) {
2499                                 char addr[INET6_ADDRSTRLEN];
2500                                 print_sockaddr(addr,
2501                                                 sizeof(addr),
2502                                                 &auto_ip_list[j].ss);
2503                                 /* Check for and don't copy any
2504                                  * known bad DC IP's. */
2505                                 if(!NT_STATUS_IS_OK(check_negative_conn_cache(
2506                                                 domain,
2507                                                 addr))) {
2508                                         DEBUG(5,("get_dc_list: "
2509                                                 "negative entry %s removed "
2510                                                 "from DC list\n",
2511                                                 addr));
2512                                         continue;
2513                                 }
2514                                 return_iplist[local_count].ss =
2515                                         auto_ip_list[j].ss;
2516                                 return_iplist[local_count].port =
2517                                         auto_ip_list[j].port;
2518                                 local_count++;
2519                         }
2520                         continue;
2521                 }
2522
2523                 /* added support for address:port syntax for ads
2524                  * (not that I think anyone will ever run the LDAP
2525                  * server in an AD domain on something other than
2526                  * port 389 */
2527
2528                 port = (lp_security() == SEC_ADS) ? LDAP_PORT : PORT_NONE;
2529                 if ((port_str=strchr(name, ':')) != NULL) {
2530                         *port_str = '\0';
2531                         port_str++;
2532                         port = atoi(port_str);
2533                 }
2534
2535                 /* explicit lookup; resolve_name() will
2536                  * handle names & IP addresses */
2537                 if (resolve_name( name, &name_ss, 0x20, true )) {
2538                         char addr[INET6_ADDRSTRLEN];
2539                         print_sockaddr(addr,
2540                                         sizeof(addr),
2541                                         &name_ss);
2542
2543                         /* Check for and don't copy any known bad DC IP's. */
2544                         if( !NT_STATUS_IS_OK(check_negative_conn_cache(domain,
2545                                                         addr)) ) {
2546                                 DEBUG(5,("get_dc_list: negative entry %s "
2547                                         "removed from DC list\n",
2548                                         name ));
2549                                 continue;
2550                         }
2551
2552                         return_iplist[local_count].ss = name_ss;
2553                         return_iplist[local_count].port = port;
2554                         local_count++;
2555                         *ordered = true;
2556                 }
2557         }
2558
2559         /* need to remove duplicates in the list if we have any
2560            explicit password servers */
2561
2562         if (local_count) {
2563                 local_count = remove_duplicate_addrs2(return_iplist,
2564                                 local_count );
2565         }
2566
2567         /* For DC's we always prioritize IPv4 due to W2K3 not
2568          * supporting LDAP, KRB5 or CLDAP over IPv6. */
2569
2570         if (local_count && return_iplist) {
2571                 prioritize_ipv4_list(return_iplist, local_count);
2572         }
2573
2574         if ( DEBUGLEVEL >= 4 ) {
2575                 DEBUG(4,("get_dc_list: returning %d ip addresses "
2576                                 "in an %sordered list\n",
2577                                 local_count,
2578                                 *ordered ? "":"un"));
2579                 DEBUG(4,("get_dc_list: "));
2580                 for ( i=0; i<local_count; i++ ) {
2581                         char addr[INET6_ADDRSTRLEN];
2582                         print_sockaddr(addr,
2583                                         sizeof(addr),
2584                                         &return_iplist[i].ss);
2585                         DEBUGADD(4,("%s:%d ", addr, return_iplist[i].port ));
2586                 }
2587                 DEBUGADD(4,("\n"));
2588         }
2589
2590         *ip_list = return_iplist;
2591         *count = local_count;
2592
2593         status = ( *count != 0 ? NT_STATUS_OK : NT_STATUS_NO_LOGON_SERVERS );
2594
2595   out:
2596
2597         if (!NT_STATUS_IS_OK(status)) {
2598                 SAFE_FREE(return_iplist);
2599                 *ip_list = NULL;
2600                 *count = 0;
2601         }
2602
2603         SAFE_FREE(auto_ip_list);
2604         TALLOC_FREE(ctx);
2605         return status;
2606 }
2607
2608 /*********************************************************************
2609  Small wrapper function to get the DC list and sort it if neccessary.
2610 *********************************************************************/
2611
2612 NTSTATUS get_sorted_dc_list( const char *domain,
2613                         const char *sitename,
2614                         struct ip_service **ip_list,
2615                         int *count,
2616                         bool ads_only )
2617 {
2618         bool ordered = false;
2619         NTSTATUS status;
2620         enum dc_lookup_type lookup_type = DC_NORMAL_LOOKUP;
2621
2622         *ip_list = NULL;
2623         *count = 0;
2624
2625         DEBUG(8,("get_sorted_dc_list: attempting lookup "
2626                 "for name %s (sitename %s) using [%s]\n",
2627                 domain,
2628                 sitename ? sitename : "NULL",
2629                 (ads_only ? "ads" : lp_name_resolve_order())));
2630
2631         if (ads_only) {
2632                 lookup_type = DC_ADS_ONLY;
2633         }
2634
2635         status = get_dc_list(domain, sitename, ip_list,
2636                         count, lookup_type, &ordered);
2637         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_LOGON_SERVERS)
2638             && sitename) {
2639                 DEBUG(3,("get_sorted_dc_list: no server for name %s available"
2640                          " in site %s, fallback to all servers\n",
2641                          domain, sitename));
2642                 status = get_dc_list(domain, NULL, ip_list,
2643                                      count, lookup_type, &ordered);
2644         }
2645
2646         if (!NT_STATUS_IS_OK(status)) {
2647                 SAFE_FREE(*ip_list);
2648                 *count = 0;
2649                 return status;
2650         }
2651
2652         /* only sort if we don't already have an ordered list */
2653         if (!ordered) {
2654                 sort_service_list(*ip_list, *count);
2655         }
2656
2657         return NT_STATUS_OK;
2658 }
2659
2660 /*********************************************************************
2661  Get the KDC list - re-use all the logic in get_dc_list.
2662 *********************************************************************/
2663
2664 NTSTATUS get_kdc_list( const char *realm,
2665                         const char *sitename,
2666                         struct ip_service **ip_list,
2667                         int *count)
2668 {
2669         bool ordered;
2670         NTSTATUS status;
2671
2672         *count = 0;
2673         *ip_list = NULL;
2674
2675         status = get_dc_list(realm, sitename, ip_list,
2676                         count, DC_KDC_ONLY, &ordered);
2677
2678         if (!NT_STATUS_IS_OK(status)) {
2679                 SAFE_FREE(*ip_list);
2680                 *count = 0;
2681                 return status;
2682         }
2683
2684         /* only sort if we don't already have an ordered list */
2685         if ( !ordered ) {
2686                 sort_service_list(*ip_list, *count);
2687         }
2688
2689         return NT_STATUS_OK;
2690 }