source3/libsmb/namequery.c

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