source3/libsmb/namequery.c

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