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