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
  23 /* nmbd.c sets this to True. */
  24 bool global_in_nmbd = False;
  25
  26 /****************************
  27  * SERVER AFFINITY ROUTINES *
  28  ****************************/
  29
  30  /* Server affinity is the concept of preferring the last domain
  31     controller with whom you had a successful conversation */
  32
  33 /****************************************************************************
  34 ****************************************************************************/
  35 #define SAFKEY_FMT      "SAF/DOMAIN/%s"
  36 #define SAF_TTL         900
  37
  38 static char *saf_key(const char *domain)
  39 {
  40         char *keystr;
  41
  42         asprintf_strupper_m(&keystr, SAFKEY_FMT, domain);
  43
  44         return keystr;
  45 }
  46
  47 /****************************************************************************
  48 ****************************************************************************/
  49
  50 bool saf_store( const char *domain, const char *servername )
  51 {
  52         char *key;
  53         time_t expire;
  54         bool ret = False;
  55
  56         if ( !domain || !servername ) {
  57                 DEBUG(2,("saf_store: "
  58                         "Refusing to store empty domain or servername!\n"));
  59                 return False;
  60         }
  61
  62         if ( (strlen(domain) == 0) || (strlen(servername) == 0) ) {
  63                 DEBUG(0,("saf_store: "
  64                         "refusing to store 0 length domain or servername!\n"));
  65                 return False;
  66         }
  67
  68         if ( !gencache_init() )
  69                 return False;
  70
  71         key = saf_key( domain );
  72         expire = time( NULL ) + SAF_TTL;
  73
  74         DEBUG(10,("saf_store: domain = [%s], server = [%s], expire = [%u]\n",
  75                 domain, servername, (unsigned int)expire ));
  76
  77         ret = gencache_set( key, servername, expire );
  78
  79         SAFE_FREE( key );
  80
  81         return ret;
  82 }
  83
  84 bool saf_delete( const char *domain )
  85 {
  86         char *key;
  87         bool ret = False;
  88
  89         if ( !domain ) {
  90                 DEBUG(2,("saf_delete: Refusing to delete empty domain\n"));
  91                 return False;
  92         }
  93
  94         if ( !gencache_init() )
  95                 return False;
  96
  97         key = saf_key(domain);
  98         ret = gencache_del(key);
  99
 100         if (ret) {
 101                 DEBUG(10,("saf_delete: domain = [%s]\n", domain ));
 102         }
 103
 104         SAFE_FREE( key );
 105
 106         return ret;
 107 }
 108
 109 /****************************************************************************
 110 ****************************************************************************/
 111
 112 char *saf_fetch( const char *domain )
 113 {
 114         char *server = NULL;
 115         time_t timeout;
 116         bool ret = False;
 117         char *key = NULL;
 118
 119         if ( !domain || strlen(domain) == 0) {
 120                 DEBUG(2,("saf_fetch: Empty domain name!\n"));
 121                 return NULL;
 122         }
 123
 124         if ( !gencache_init() )
 125                 return False;
 126
 127         key = saf_key( domain );
 128
 129         ret = gencache_get( key, &server, &timeout );
 130
 131         SAFE_FREE( key );
 132
 133         if ( !ret ) {
 134                 DEBUG(5,("saf_fetch: failed to find server for \"%s\" domain\n",
 135                                         domain ));
 136         } else {
 137                 DEBUG(5,("saf_fetch: Returning \"%s\" for \"%s\" domain\n",
 138                         server, domain ));
 139         }
 140
 141         return server;
 142 }
 143
 144 /****************************************************************************
 145  Generate a random trn_id.
 146 ****************************************************************************/
 147
 148 static int generate_trn_id(void)
 149 {
 150         uint16 id;
 151
 152         generate_random_buffer((uint8 *)&id, sizeof(id));
 153
 154         return id % (unsigned)0x7FFF;
 155 }
 156
 157 /****************************************************************************
 158  Parse a node status response into an array of structures.
 159 ****************************************************************************/
 160
 161 static NODE_STATUS_STRUCT *parse_node_status(char *p,
 162                                 int *num_names,
 163                                 struct node_status_extra *extra)
 164 {
 165         NODE_STATUS_STRUCT *ret;
 166         int i;
 167
 168         *num_names = CVAL(p,0);
 169
 170         if (*num_names == 0)
 171                 return NULL;
 172
 173         ret = SMB_MALLOC_ARRAY(NODE_STATUS_STRUCT,*num_names);
 174         if (!ret)
 175                 return NULL;
 176
 177         p++;
 178         for (i=0;i< *num_names;i++) {
 179                 StrnCpy(ret[i].name,p,15);
 180                 trim_char(ret[i].name,'\0',' ');
 181                 ret[i].type = CVAL(p,15);
 182                 ret[i].flags = p[16];
 183                 p += 18;
 184                 DEBUG(10, ("%s#%02x: flags = 0x%02x\n", ret[i].name,
 185                            ret[i].type, ret[i].flags));
 186         }
 187         /*
 188          * Also, pick up the MAC address ...
 189          */
 190         if (extra) {
 191                 memcpy(&extra->mac_addr, p, 6); /* Fill in the mac addr */
 192         }
 193         return ret;
 194 }
 195
 196
 197 /****************************************************************************
 198  Do a NBT node status query on an open socket and return an array of
 199  structures holding the returned names or NULL if the query failed.
 200 **************************************************************************/
 201
 202 NODE_STATUS_STRUCT *node_status_query(int fd,
 203                                         struct nmb_name *name,
 204                                         const struct sockaddr_storage *to_ss,
 205                                         int *num_names,
 206                                         struct node_status_extra *extra)
 207 {
 208         bool found=False;
 209         int retries = 2;
 210         int retry_time = 2000;
 211         struct timeval tval;
 212         struct packet_struct p;
 213         struct packet_struct *p2;
 214         struct nmb_packet *nmb = &p.packet.nmb;
 215         NODE_STATUS_STRUCT *ret;
 216
 217         ZERO_STRUCT(p);
 218
 219         if (to_ss->ss_family != AF_INET) {
 220                 /* Can't do node status to IPv6 */
 221                 return NULL;
 222         }
 223         nmb->header.name_trn_id = generate_trn_id();
 224         nmb->header.opcode = 0;
 225         nmb->header.response = false;
 226         nmb->header.nm_flags.bcast = false;
 227         nmb->header.nm_flags.recursion_available = false;
 228         nmb->header.nm_flags.recursion_desired = false;
 229         nmb->header.nm_flags.trunc = false;
 230         nmb->header.nm_flags.authoritative = false;
 231         nmb->header.rcode = 0;
 232         nmb->header.qdcount = 1;
 233         nmb->header.ancount = 0;
 234         nmb->header.nscount = 0;
 235         nmb->header.arcount = 0;
 236         nmb->question.question_name = *name;
 237         nmb->question.question_type = 0x21;
 238         nmb->question.question_class = 0x1;
 239
 240         p.ip = ((const struct sockaddr_in *)to_ss)->sin_addr;
 241         p.port = NMB_PORT;
 242         p.fd = fd;
 243         p.timestamp = time(NULL);
 244         p.packet_type = NMB_PACKET;
 245
 246         GetTimeOfDay(&tval);
 247
 248         if (!send_packet(&p))
 249                 return NULL;
 250
 251         retries--;
 252
 253         while (1) {
 254                 struct timeval tval2;
 255                 GetTimeOfDay(&tval2);
 256                 if (TvalDiff(&tval,&tval2) > retry_time) {
 257                         if (!retries)
 258                                 break;
 259                         if (!found && !send_packet(&p))
 260                                 return NULL;
 261                         GetTimeOfDay(&tval);
 262                         retries--;
 263                 }
 264
 265                 if ((p2=receive_nmb_packet(fd,90,nmb->header.name_trn_id))) {
 266                         struct nmb_packet *nmb2 = &p2->packet.nmb;
 267                         debug_nmb_packet(p2);
 268
 269                         if (nmb2->header.opcode != 0 ||
 270                             nmb2->header.nm_flags.bcast ||
 271                             nmb2->header.rcode ||
 272                             !nmb2->header.ancount ||
 273                             nmb2->answers->rr_type != 0x21) {
 274                                 /* XXXX what do we do with this? could be a
 275                                    redirect, but we'll discard it for the
 276                                    moment */
 277                                 free_packet(p2);
 278                                 continue;
 279                         }
 280
 281                         ret = parse_node_status(&nmb2->answers->rdata[0],
 282                                         num_names, extra);
 283                         free_packet(p2);
 284                         return ret;
 285                 }
 286         }
 287
 288         return NULL;
 289 }
 290
 291 /****************************************************************************
 292  Find the first type XX name in a node status reply - used for finding
 293  a servers name given its IP. Return the matched name in *name.
 294 **************************************************************************/
 295
 296 bool name_status_find(const char *q_name,
 297                         int q_type,
 298                         int type,
 299                         const struct sockaddr_storage *to_ss,
 300                         fstring name)
 301 {
 302         char addr[INET6_ADDRSTRLEN];
 303         struct sockaddr_storage ss;
 304         NODE_STATUS_STRUCT *status = NULL;
 305         struct nmb_name nname;
 306         int count, i;
 307         int sock;
 308         bool result = false;
 309
 310         if (lp_disable_netbios()) {
 311                 DEBUG(5,("name_status_find(%s#%02x): netbios is disabled\n",
 312                                         q_name, q_type));
 313                 return False;
 314         }
 315
 316         print_sockaddr(addr, sizeof(addr), to_ss);
 317
 318         DEBUG(10, ("name_status_find: looking up %s#%02x at %s\n", q_name,
 319                    q_type, addr));
 320
 321         /* Check the cache first. */
 322
 323         if (namecache_status_fetch(q_name, q_type, type, to_ss, name)) {
 324                 return True;
 325         }
 326
 327         if (to_ss->ss_family != AF_INET) {
 328                 /* Can't do node status to IPv6 */
 329                 return false;
 330         }
 331
 332         if (!interpret_string_addr(&ss, lp_socket_address(),
 333                                 AI_NUMERICHOST|AI_PASSIVE)) {
 334                 zero_addr(&ss);
 335         }
 336
 337         sock = open_socket_in(SOCK_DGRAM, 0, 3, &ss, True);
 338         if (sock == -1)
 339                 goto done;
 340
 341         /* W2K PDC's seem not to respond to '*'#0. JRA */
 342         make_nmb_name(&nname, q_name, q_type);
 343         status = node_status_query(sock, &nname, to_ss, &count, NULL);
 344         close(sock);
 345         if (!status)
 346                 goto done;
 347
 348         for (i=0;i<count;i++) {
 349                 if (status[i].type == type)
 350                         break;
 351         }
 352         if (i == count)
 353                 goto done;
 354
 355         pull_ascii_nstring(name, sizeof(fstring), status[i].name);
 356
 357         /* Store the result in the cache. */
 358         /* but don't store an entry for 0x1c names here.  Here we have
 359            a single host and DOMAIN<0x1c> names should be a list of hosts */
 360
 361         if ( q_type != 0x1c ) {
 362                 namecache_status_store(q_name, q_type, type, to_ss, name);
 363         }
 364
 365         result = true;
 366
 367  done:
 368         SAFE_FREE(status);
 369
 370         DEBUG(10, ("name_status_find: name %sfound", result ? "" : "not "));
 371
 372         if (result)
 373                 DEBUGADD(10, (", name %s ip address is %s", name, addr));
 374
 375         DEBUG(10, ("\n"));
 376
 377         return result;
 378 }
 379
 380 /*
 381   comparison function used by sort_addr_list
 382 */
 383
 384 static int addr_compare(const struct sockaddr_storage *ss1,
 385                 const struct sockaddr_storage *ss2)
 386 {
 387         int max_bits1=0, max_bits2=0;
 388         int num_interfaces = iface_count();
 389         int i;
 390
 391         /* Sort IPv6 addresses first. */
 392         if (ss1->ss_family != ss2->ss_family) {
 393                 if (ss2->ss_family == AF_INET) {
 394                         return -1;
 395                 } else {
 396                         return 1;
 397                 }
 398         }
 399
 400         /* Here we know both addresses are of the same
 401          * family. */
 402
 403         for (i=0;i<num_interfaces;i++) {
 404                 const struct sockaddr_storage *pss = iface_n_bcast(i);
 405                 unsigned char *p_ss1 = NULL;
 406                 unsigned char *p_ss2 = NULL;
 407                 unsigned char *p_if = NULL;
 408                 size_t len = 0;
 409                 int bits1, bits2;
 410
 411                 if (pss->ss_family != ss1->ss_family) {
 412                         /* Ignore interfaces of the wrong type. */
 413                         continue;
 414                 }
 415                 if (pss->ss_family == AF_INET) {
 416                         p_if = (unsigned char *)
 417                                 &((const struct sockaddr_in *)pss)->sin_addr;
 418                         p_ss1 = (unsigned char *)
 419                                 &((const struct sockaddr_in *)ss1)->sin_addr;
 420                         p_ss2 = (unsigned char *)
 421                                 &((const struct sockaddr_in *)ss2)->sin_addr;
 422                         len = 4;
 423                 }
 424 #if defined(HAVE_IPV6)
 425                 if (pss->ss_family == AF_INET6) {
 426                         p_if = (unsigned char *)
 427                                 &((const struct sockaddr_in6 *)pss)->sin6_addr;
 428                         p_ss1 = (unsigned char *)
 429                                 &((const struct sockaddr_in6 *)ss1)->sin6_addr;
 430                         p_ss2 = (unsigned char *)
 431                                 &((const struct sockaddr_in6 *)ss2)->sin6_addr;
 432                         len = 16;
 433                 }
 434 #endif
 435                 if (!p_ss1 || !p_ss2 || !p_if || len == 0) {
 436                         continue;
 437                 }
 438                 bits1 = matching_len_bits(p_ss1, p_if, len);
 439                 bits2 = matching_len_bits(p_ss2, p_if, len);
 440                 max_bits1 = MAX(bits1, max_bits1);
 441                 max_bits2 = MAX(bits2, max_bits2);
 442         }
 443
 444         /* Bias towards directly reachable IPs */
 445         if (iface_local(ss1)) {
 446                 if (ss1->ss_family == AF_INET) {
 447                         max_bits1 += 32;
 448                 } else {
 449                         max_bits1 += 128;
 450                 }
 451         }
 452         if (iface_local(ss2)) {
 453                 if (ss2->ss_family == AF_INET) {
 454                         max_bits2 += 32;
 455                 } else {
 456                         max_bits2 += 128;
 457                 }
 458         }
 459         return max_bits2 - max_bits1;
 460 }
 461
 462 /*******************************************************************
 463  compare 2 ldap IPs by nearness to our interfaces - used in qsort
 464 *******************************************************************/
 465
 466 int ip_service_compare(struct ip_service *ss1, struct ip_service *ss2)
 467 {
 468         int result;
 469
 470         if ((result = addr_compare(&ss1->ss, &ss2->ss)) != 0) {
 471                 return result;
 472         }
 473
 474         if (ss1->port > ss2->port) {
 475                 return 1;
 476         }
 477
 478         if (ss1->port < ss2->port) {
 479                 return -1;
 480         }
 481
 482         return 0;
 483 }
 484
 485 /*
 486   sort an IP list so that names that are close to one of our interfaces
 487   are at the top. This prevents the problem where a WINS server returns an IP
 488   that is not reachable from our subnet as the first match
 489 */
 490
 491 static void sort_addr_list(struct sockaddr_storage *sslist, int count)
 492 {
 493         if (count <= 1) {
 494                 return;
 495         }
 496
 497         qsort(sslist, count, sizeof(struct sockaddr_storage),
 498                         QSORT_CAST addr_compare);
 499 }
 500
 501 static void sort_service_list(struct ip_service *servlist, int count)
 502 {
 503         if (count <= 1) {
 504                 return;
 505         }
 506
 507         qsort(servlist, count, sizeof(struct ip_service),
 508                         QSORT_CAST ip_service_compare);
 509 }
 510
 511 /**********************************************************************
 512  Remove any duplicate address/port pairs in the list
 513  *********************************************************************/
 514
 515 static int remove_duplicate_addrs2(struct ip_service *iplist, int count )
 516 {
 517         int i, j;
 518
 519         DEBUG(10,("remove_duplicate_addrs2: "
 520                         "looking for duplicate address/port pairs\n"));
 521
 522         /* one loop to remove duplicates */
 523         for ( i=0; i<count; i++ ) {
 524                 if ( is_zero_addr(&iplist[i].ss)) {
 525                         continue;
 526                 }
 527
 528                 for ( j=i+1; j<count; j++ ) {
 529                         if (addr_equal(&iplist[i].ss, &iplist[j].ss) &&
 530                                         iplist[i].port == iplist[j].port) {
 531                                 zero_addr(&iplist[j].ss);
 532                         }
 533                 }
 534         }
 535
 536         /* one loop to clean up any holes we left */
 537         /* first ip should never be a zero_ip() */
 538         for (i = 0; i<count; ) {
 539                 if (is_zero_addr(&iplist[i].ss) ) {
 540                         if (i != count-1) {
 541                                 memmove(&iplist[i], &iplist[i+1],
 542                                         (count - i - 1)*sizeof(iplist[i]));
 543                         }
 544                         count--;
 545                         continue;
 546                 }
 547                 i++;
 548         }
 549
 550         return count;
 551 }
 552
 553 /****************************************************************************
 554  Do a netbios name query to find someones IP.
 555  Returns an array of IP addresses or NULL if none.
 556  *count will be set to the number of addresses returned.
 557  *timed_out is set if we failed by timing out
 558 ****************************************************************************/
 559
 560 struct sockaddr_storage *name_query(int fd,
 561                         const char *name,
 562                         int name_type,
 563                         bool bcast,
 564                         bool recurse,
 565                         const struct sockaddr_storage *to_ss,
 566                         int *count,
 567                         int *flags,
 568                         bool *timed_out)
 569 {
 570         bool found=false;
 571         int i, retries = 3;
 572         int retry_time = bcast?250:2000;
 573         struct timeval tval;
 574         struct packet_struct p;
 575         struct packet_struct *p2;
 576         struct nmb_packet *nmb = &p.packet.nmb;
 577         struct sockaddr_storage *ss_list = NULL;
 578
 579         if (lp_disable_netbios()) {
 580                 DEBUG(5,("name_query(%s#%02x): netbios is disabled\n",
 581                                         name, name_type));
 582                 return NULL;
 583         }
 584
 585         if (to_ss->ss_family != AF_INET) {
 586                 return NULL;
 587         }
 588
 589         if (timed_out) {
 590                 *timed_out = false;
 591         }
 592
 593         memset((char *)&p,'\0',sizeof(p));
 594         (*count) = 0;
 595         (*flags) = 0;
 596
 597         nmb->header.name_trn_id = generate_trn_id();
 598         nmb->header.opcode = 0;
 599         nmb->header.response = false;
 600         nmb->header.nm_flags.bcast = bcast;
 601         nmb->header.nm_flags.recursion_available = false;
 602         nmb->header.nm_flags.recursion_desired = recurse;
 603         nmb->header.nm_flags.trunc = false;
 604         nmb->header.nm_flags.authoritative = false;
 605         nmb->header.rcode = 0;
 606         nmb->header.qdcount = 1;
 607         nmb->header.ancount = 0;
 608         nmb->header.nscount = 0;
 609         nmb->header.arcount = 0;
 610
 611         make_nmb_name(&nmb->question.question_name,name,name_type);
 612
 613         nmb->question.question_type = 0x20;
 614         nmb->question.question_class = 0x1;
 615
 616         p.ip = ((struct sockaddr_in *)to_ss)->sin_addr;
 617         p.port = NMB_PORT;
 618         p.fd = fd;
 619         p.timestamp = time(NULL);
 620         p.packet_type = NMB_PACKET;
 621
 622         GetTimeOfDay(&tval);
 623
 624         if (!send_packet(&p))
 625                 return NULL;
 626
 627         retries--;
 628
 629         while (1) {
 630                 struct timeval tval2;
 631
 632                 GetTimeOfDay(&tval2);
 633                 if (TvalDiff(&tval,&tval2) > retry_time) {
 634                         if (!retries)
 635                                 break;
 636                         if (!found && !send_packet(&p))
 637                                 return NULL;
 638                         GetTimeOfDay(&tval);
 639                         retries--;
 640                 }
 641
 642                 if ((p2=receive_nmb_packet(fd,90,nmb->header.name_trn_id))) {
 643                         struct nmb_packet *nmb2 = &p2->packet.nmb;
 644                         debug_nmb_packet(p2);
 645
 646                         /* If we get a Negative Name Query Response from a WINS
 647                          * server, we should report it and give up.
 648                          */
 649                         if( 0 == nmb2->header.opcode    /* A query response   */
 650                             && !(bcast)                 /* from a WINS server */
 651                             && nmb2->header.rcode       /* Error returned     */
 652                                 ) {
 653
 654                                 if( DEBUGLVL( 3 ) ) {
 655                                         /* Only executed if DEBUGLEVEL >= 3 */
 656                                         dbgtext( "Negative name query "
 657                                                 "response, rcode 0x%02x: ",
 658                                                 nmb2->header.rcode );
 659                                         switch( nmb2->header.rcode ) {
 660                                         case 0x01:
 661                                                 dbgtext( "Request "
 662                                                 "was invalidly formatted.\n" );
 663                                                 break;
 664                                         case 0x02:
 665                                                 dbgtext( "Problem with NBNS, "
 666                                                 "cannot process name.\n");
 667                                                 break;
 668                                         case 0x03:
 669                                                 dbgtext( "The name requested "
 670                                                 "does not exist.\n" );
 671                                                 break;
 672                                         case 0x04:
 673                                                 dbgtext( "Unsupported request "
 674                                                 "error.\n" );
 675                                                 break;
 676                                         case 0x05:
 677                                                 dbgtext( "Query refused "
 678                                                 "error.\n" );
 679                                                 break;
 680                                         default:
 681                                                 dbgtext( "Unrecognized error "
 682                                                 "code.\n" );
 683                                                 break;
 684                                         }
 685                                 }
 686                                 free_packet(p2);
 687                                 return( NULL );
 688                         }
 689
 690                         if (nmb2->header.opcode != 0 ||
 691                             nmb2->header.nm_flags.bcast ||
 692                             nmb2->header.rcode ||
 693                             !nmb2->header.ancount) {
 694                                 /*
 695                                  * XXXX what do we do with this? Could be a
 696                                  * redirect, but we'll discard it for the
 697                                  * moment.
 698                                  */
 699                                 free_packet(p2);
 700                                 continue;
 701                         }
 702
 703                         ss_list = SMB_REALLOC_ARRAY(ss_list,
 704                                                 struct sockaddr_storage,
 705                                                 (*count) +
 706                                                 nmb2->answers->rdlength/6);
 707
 708                         if (!ss_list) {
 709                                 DEBUG(0,("name_query: Realloc failed.\n"));
 710                                 free_packet(p2);
 711                                 return NULL;
 712                         }
 713
 714                         DEBUG(2,("Got a positive name query response "
 715                                         "from %s ( ",
 716                                         inet_ntoa(p2->ip)));
 717
 718                         for (i=0;i<nmb2->answers->rdlength/6;i++) {
 719                                 struct in_addr ip;
 720                                 putip((char *)&ip,&nmb2->answers->rdata[2+i*6]);
 721                                 in_addr_to_sockaddr_storage(&ss_list[(*count)],
 722                                                 ip);
 723                                 DEBUGADD(2,("%s ",inet_ntoa(ip)));
 724                                 (*count)++;
 725                         }
 726                         DEBUGADD(2,(")\n"));
 727
 728                         found=true;
 729                         retries=0;
 730                         /* We add the flags back ... */
 731                         if (nmb2->header.response)
 732                                 (*flags) |= NM_FLAGS_RS;
 733                         if (nmb2->header.nm_flags.authoritative)
 734                                 (*flags) |= NM_FLAGS_AA;
 735                         if (nmb2->header.nm_flags.trunc)
 736                                 (*flags) |= NM_FLAGS_TC;
 737                         if (nmb2->header.nm_flags.recursion_desired)
 738                                 (*flags) |= NM_FLAGS_RD;
 739                         if (nmb2->header.nm_flags.recursion_available)
 740                                 (*flags) |= NM_FLAGS_RA;
 741                         if (nmb2->header.nm_flags.bcast)
 742                                 (*flags) |= NM_FLAGS_B;
 743                         free_packet(p2);
 744                         /*
 745                          * If we're doing a unicast lookup we only
 746                          * expect one reply. Don't wait the full 2
 747                          * seconds if we got one. JRA.
 748                          */
 749                         if(!bcast && found)
 750                                 break;
 751                 }
 752         }
 753
 754         /* only set timed_out if we didn't fund what we where looking for*/
 755
 756         if ( !found && timed_out ) {
 757                 *timed_out = true;
 758         }
 759
 760         /* sort the ip list so we choose close servers first if possible */
 761         sort_addr_list(ss_list, *count);
 762
 763         return ss_list;
 764 }
 765
 766 /********************************************************
 767  Start parsing the lmhosts file.
 768 *********************************************************/
 769
 770 XFILE *startlmhosts(const char *fname)
 771 {
 772         XFILE *fp = x_fopen(fname,O_RDONLY, 0);
 773         if (!fp) {
 774                 DEBUG(4,("startlmhosts: Can't open lmhosts file %s. "
 775                         "Error was %s\n",
 776                         fname, strerror(errno)));
 777                 return NULL;
 778         }
 779         return fp;
 780 }
 781
 782 /********************************************************
 783  Parse the next line in the lmhosts file.
 784 *********************************************************/
 785
 786 bool getlmhostsent(TALLOC_CTX *ctx, XFILE *fp, char **pp_name, int *name_type,
 787                 struct sockaddr_storage *pss)
 788 {
 789         char line[1024];
 790
 791         *pp_name = NULL;
 792
 793         while(!x_feof(fp) && !x_ferror(fp)) {
 794                 char *ip;
 795                 char *flags;
 796                 char *extra;
 797                 char *name;
 798                 const char *ptr;
 799                 char *ptr1;
 800                 int count = 0;
 801
 802                 *name_type = -1;
 803
 804                 if (!fgets_slash(line,sizeof(line),fp)) {
 805                         continue;
 806                 }
 807
 808                 if (*line == '#') {
 809                         continue;
 810                 }
 811
 812                 ip[0] = '\0';
 813                 name[0] = '\0';
 814                 flags[0] = '\0';
 815
 816                 ptr = line;
 817
 818                 if (next_token_talloc(ctx, &ptr, &ip, NULL))
 819                         ++count;
 820                 if (next_token_talloc(ctx, &ptr, &name, NULL))
 821                         ++count;
 822                 if (next_token_talloc(ctx, &ptr, &flags, NULL))
 823                         ++count;
 824                 if (next_token_talloc(ctx, &ptr, &extra, NULL))
 825                         ++count;
 826
 827                 if (count <= 0)
 828                         continue;
 829
 830                 if (count > 0 && count < 2) {
 831                         DEBUG(0,("getlmhostsent: Ill formed hosts line [%s]\n",
 832                                                 line));
 833                         continue;
 834                 }
 835
 836                 if (count >= 4) {
 837                         DEBUG(0,("getlmhostsent: too many columns "
 838                                 "in lmhosts file (obsolete syntax)\n"));
 839                         continue;
 840                 }
 841
 842                 DEBUG(4, ("getlmhostsent: lmhost entry: %s %s %s\n",
 843                                         ip, name, flags));
 844
 845                 if (strchr_m(flags,'G') || strchr_m(flags,'S')) {
 846                         DEBUG(0,("getlmhostsent: group flag "
 847                                 "in lmhosts ignored (obsolete)\n"));
 848                         continue;
 849                 }
 850
 851                 if (!interpret_string_addr(pss, ip, AI_NUMERICHOST)) {
 852                         DEBUG(0,("getlmhostsent: invalid address "
 853                                 "%s.\n", ip));
 854                 }
 855
 856                 /* Extra feature. If the name ends in '#XX',
 857                  * where XX is a hex number, then only add that name type. */
 858                 if((ptr1 = strchr_m(name, '#')) != NULL) {
 859                         char *endptr;
 860                         ptr1++;
 861
 862                         *name_type = (int)strtol(ptr1, &endptr, 16);
 863                         if(!*ptr1 || (endptr == ptr1)) {
 864                                 DEBUG(0,("getlmhostsent: invalid name "
 865                                         "%s containing '#'.\n", name));
 866                                 continue;
 867                         }
 868
 869                         *(--ptr1) = '\0'; /* Truncate at the '#' */
 870                 }
 871
 872                 *pp_name = talloc_strdup(ctx, name);
 873                 if (!*pp_name) {
 874                         return false;
 875                 }
 876                 return true;
 877         }
 878
 879         return false;
 880 }
 881
 882 /********************************************************
 883  Finish parsing the lmhosts file.
 884 *********************************************************/
 885
 886 void endlmhosts(XFILE *fp)
 887 {
 888         x_fclose(fp);
 889 }
 890
 891 /********************************************************
 892  convert an array if struct sockaddr_storage to struct ip_service
 893  return false on failure.  Port is set to PORT_NONE;
 894 *********************************************************/
 895
 896 static bool convert_ss2service(struct ip_service **return_iplist,
 897                 const struct sockaddr_storage *ss_list,
 898                 int count)
 899 {
 900         int i;
 901
 902         if ( count==0 || !ss_list )
 903                 return False;
 904
 905         /* copy the ip address; port will be PORT_NONE */
 906         if ((*return_iplist = SMB_MALLOC_ARRAY(struct ip_service, count)) ==
 907                         NULL) {
 908                 DEBUG(0,("convert_ip2service: malloc failed "
 909                         "for %d enetries!\n", count ));
 910                 return False;
 911         }
 912
 913         for ( i=0; i<count; i++ ) {
 914                 (*return_iplist)[i].ss   = ss_list[i];
 915                 (*return_iplist)[i].port = PORT_NONE;
 916         }
 917
 918         return true;
 919 }
 920
 921 /********************************************************
 922  Resolve via "bcast" method.
 923 *********************************************************/
 924
 925 NTSTATUS name_resolve_bcast(const char *name,
 926                         int name_type,
 927                         struct ip_service **return_iplist,
 928                         int *return_count)
 929 {
 930         int sock, i;
 931         int num_interfaces = iface_count();
 932         struct sockaddr_storage *ss_list;
 933         struct sockaddr_storage ss;
 934         NTSTATUS status;
 935
 936         if (lp_disable_netbios()) {
 937                 DEBUG(5,("name_resolve_bcast(%s#%02x): netbios is disabled\n",
 938                                         name, name_type));
 939                 return NT_STATUS_INVALID_PARAMETER;
 940         }
 941
 942         *return_iplist = NULL;
 943         *return_count = 0;
 944
 945         /*
 946          * "bcast" means do a broadcast lookup on all the local interfaces.
 947          */
 948
 949         DEBUG(3,("name_resolve_bcast: Attempting broadcast lookup "
 950                 "for name %s<0x%x>\n", name, name_type));
 951
 952         if (!interpret_string_addr(&ss, lp_socket_address(),
 953                                 AI_NUMERICHOST|AI_PASSIVE)) {
 954                 zero_addr(&ss);
 955         }
 956
 957         sock = open_socket_in( SOCK_DGRAM, 0, 3, &ss, true );
 958         if (sock == -1) {
 959                 return NT_STATUS_UNSUCCESSFUL;
 960         }
 961
 962         set_socket_options(sock,"SO_BROADCAST");
 963         /*
 964          * Lookup the name on all the interfaces, return on
 965          * the first successful match.
 966          */
 967         for( i = num_interfaces-1; i >= 0; i--) {
 968                 const struct sockaddr_storage *pss = iface_n_bcast(i);
 969                 int flags;
 970
 971                 /* Done this way to fix compiler error on IRIX 5.x */
 972                 if (!pss) {
 973                         continue;
 974                 }
 975                 ss_list = name_query(sock, name, name_type, true,
 976                                     true, pss, return_count, &flags, NULL);
 977                 if (ss_list) {
 978                         goto success;
 979                 }
 980         }
 981
 982         /* failed - no response */
 983
 984         close(sock);
 985         return NT_STATUS_UNSUCCESSFUL;
 986
 987 success:
 988
 989         status = NT_STATUS_OK;
 990         if (!convert_ss2service(return_iplist, ss_list, *return_count) )
 991                 status = NT_STATUS_INVALID_PARAMETER;
 992
 993         SAFE_FREE(ss_list);
 994         close(sock);
 995         return status;
 996 }
 997
 998 /********************************************************
 999  Resolve via "wins" method.
1000 *********************************************************/
1001
1002 NTSTATUS resolve_wins(const char *name,
1003                 int name_type,
1004                 struct ip_service **return_iplist,
1005                 int *return_count)
1006 {
1007         int sock, t, i;
1008         char **wins_tags;
1009         struct sockaddr_storage src_ss, *ss_list = NULL;
1010         struct in_addr src_ip;
1011         NTSTATUS status;
1012
1013         if (lp_disable_netbios()) {
1014                 DEBUG(5,("resolve_wins(%s#%02x): netbios is disabled\n",
1015                                         name, name_type));
1016                 return NT_STATUS_INVALID_PARAMETER;
1017         }
1018
1019         *return_iplist = NULL;
1020         *return_count = 0;
1021
1022         DEBUG(3,("resolve_wins: Attempting wins lookup for name %s<0x%x>\n",
1023                                 name, name_type));
1024
1025         if (wins_srv_count() < 1) {
1026                 DEBUG(3,("resolve_wins: WINS server resolution selected "
1027                         "and no WINS servers listed.\n"));
1028                 return NT_STATUS_INVALID_PARAMETER;
1029         }
1030
1031         /* we try a lookup on each of the WINS tags in turn */
1032         wins_tags = wins_srv_tags();
1033
1034         if (!wins_tags) {
1035                 /* huh? no tags?? give up in disgust */
1036                 return NT_STATUS_INVALID_PARAMETER;
1037         }
1038
1039         /* the address we will be sending from */
1040         if (!interpret_string_addr(&src_ss, lp_socket_address(),
1041                                 AI_NUMERICHOST|AI_PASSIVE)) {
1042                 zero_addr(&src_ss);
1043         }
1044
1045         if (src_ss.ss_family != AF_INET) {
1046                 char addr[INET6_ADDRSTRLEN];
1047                 print_sockaddr(addr, sizeof(addr), &src_ss);
1048                 DEBUG(3,("resolve_wins: cannot receive WINS replies "
1049                         "on IPv6 address %s\n",
1050                         addr));
1051                 return NT_STATUS_INVALID_PARAMETER;
1052         }
1053
1054         src_ip = ((struct sockaddr_in *)&src_ss)->sin_addr;
1055
1056         /* in the worst case we will try every wins server with every
1057            tag! */
1058         for (t=0; wins_tags && wins_tags[t]; t++) {
1059                 int srv_count = wins_srv_count_tag(wins_tags[t]);
1060                 for (i=0; i<srv_count; i++) {
1061                         struct sockaddr_storage wins_ss;
1062                         struct in_addr wins_ip;
1063                         int flags;
1064                         bool timed_out;
1065
1066                         wins_ip = wins_srv_ip_tag(wins_tags[t], src_ip);
1067
1068                         if (global_in_nmbd && ismyip_v4(wins_ip)) {
1069                                 /* yikes! we'll loop forever */
1070                                 continue;
1071                         }
1072
1073                         /* skip any that have been unresponsive lately */
1074                         if (wins_srv_is_dead(wins_ip, src_ip)) {
1075                                 continue;
1076                         }
1077
1078                         DEBUG(3,("resolve_wins: using WINS server %s "
1079                                 "and tag '%s'\n",
1080                                 inet_ntoa(wins_ip), wins_tags[t]));
1081
1082                         sock = open_socket_in(SOCK_DGRAM, 0, 3, &src_ss, true);
1083                         if (sock == -1) {
1084                                 continue;
1085                         }
1086
1087                         in_addr_to_sockaddr_storage(&wins_ss, wins_ip);
1088                         ss_list = name_query(sock,
1089                                                 name,
1090                                                 name_type,
1091                                                 false,
1092                                                 true,
1093                                                 &wins_ss,
1094                                                 return_count,
1095                                                 &flags,
1096                                                 &timed_out);
1097
1098                         /* exit loop if we got a list of addresses */
1099
1100                         if (ss_list)
1101                                 goto success;
1102
1103                         close(sock);
1104
1105                         if (timed_out) {
1106                                 /* Timed out wating for WINS server to respond.
1107                                  * Mark it dead. */
1108                                 wins_srv_died(wins_ip, src_ip);
1109                         } else {
1110                                 /* The name definately isn't in this
1111                                    group of WINS servers.
1112                                    goto the next group  */
1113                                 break;
1114                         }
1115                 }
1116         }
1117
1118         wins_srv_tags_free(wins_tags);
1119         return NT_STATUS_NO_LOGON_SERVERS;
1120
1121 success:
1122
1123         status = NT_STATUS_OK;
1124         if (!convert_ss2service(return_iplist, ss_list, *return_count))
1125                 status = NT_STATUS_INVALID_PARAMETER;
1126
1127         SAFE_FREE(ss_list);
1128         wins_srv_tags_free(wins_tags);
1129         close(sock);
1130
1131         return status;
1132 }
1133
1134 /********************************************************
1135  Resolve via "lmhosts" method.
1136 *********************************************************/
1137
1138 static NTSTATUS resolve_lmhosts(const char *name, int name_type,
1139                                 struct ip_service **return_iplist,
1140                                 int *return_count)
1141 {
1142         /*
1143          * "lmhosts" means parse the local lmhosts file.
1144          */
1145
1146         XFILE *fp;
1147         char *lmhost_name = NULL;
1148         int name_type2;
1149         struct sockaddr_storage return_ss;
1150         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1151         TALLOC_CTX *ctx = NULL;
1152
1153         *return_iplist = NULL;
1154         *return_count = 0;
1155
1156         DEBUG(3,("resolve_lmhosts: "
1157                 "Attempting lmhosts lookup for name %s<0x%x>\n",
1158                 name, name_type));
1159
1160         fp = startlmhosts(dyn_LMHOSTSFILE);
1161
1162         if ( fp == NULL )
1163                 return NT_STATUS_NO_SUCH_FILE;
1164
1165         ctx = talloc_init("resolve_lmhosts");
1166         if (!ctx) {
1167                 endlmhosts(fp);
1168                 return NT_STATUS_NO_MEMORY;
1169         }
1170
1171         while (getlmhostsent(ctx, fp, &lmhost_name, &name_type2, &return_ss)) {
1172
1173                 if (!strequal(name, lmhost_name)) {
1174                         TALLOC_FREE(lmhost_name);
1175                         continue;
1176                 }
1177
1178                 if ((name_type2 != -1) && (name_type != name_type2)) {
1179                         TALLOC_FREE(lmhost_name);
1180                         continue;
1181                 }
1182
1183                 *return_iplist = SMB_REALLOC_ARRAY((*return_iplist),
1184                                         struct ip_service,
1185                                         (*return_count)+1);
1186
1187                 if ((*return_iplist) == NULL) {
1188                         TALLOC_FREE(ctx);
1189                         endlmhosts(fp);
1190                         DEBUG(3,("resolve_lmhosts: malloc fail !\n"));
1191                         return NT_STATUS_NO_MEMORY;
1192                 }
1193
1194                 (*return_iplist)[*return_count].ss = return_ss;
1195                 (*return_iplist)[*return_count].port = PORT_NONE;
1196                 *return_count += 1;
1197
1198                 /* we found something */
1199                 status = NT_STATUS_OK;
1200
1201                 /* Multiple names only for DC lookup */
1202                 if (name_type != 0x1c)
1203                         break;
1204         }
1205
1206         TALLOC_FREE(ctx);
1207         endlmhosts(fp);
1208         return status;
1209 }
1210
1211
1212 /********************************************************
1213  Resolve via "hosts" method.
1214 *********************************************************/
1215
1216 static NTSTATUS resolve_hosts(const char *name, int name_type,
1217                               struct ip_service **return_iplist,
1218                               int *return_count)
1219 {
1220         /*
1221          * "host" means do a localhost, or dns lookup.
1222          */
1223         struct addrinfo hints;
1224         struct addrinfo *ailist = NULL;
1225         struct addrinfo *res = NULL;
1226         int ret = -1;
1227         int i = 0;
1228
1229         if ( name_type != 0x20 && name_type != 0x0) {
1230                 DEBUG(5, ("resolve_hosts: not appropriate "
1231                         "for name type <0x%x>\n",
1232                         name_type));
1233                 return NT_STATUS_INVALID_PARAMETER;
1234         }
1235
1236         *return_iplist = NULL;
1237         *return_count = 0;
1238
1239         DEBUG(3,("resolve_hosts: Attempting host lookup for name %s<0x%x>\n",
1240                                 name, name_type));
1241
1242         ZERO_STRUCT(hints);
1243         /* By default make sure it supports TCP. */
1244         hints.ai_socktype = SOCK_STREAM;
1245         hints.ai_flags = AI_ADDRCONFIG;
1246
1247         ret = getaddrinfo(name,
1248                         NULL,
1249                         &hints,
1250                         &ailist);
1251         if (ret) {
1252                 DEBUG(3,("resolve_hosts: getaddrinfo failed for name %s [%s]\n",
1253                         name,
1254                         gai_strerror(ret) ));
1255         }
1256
1257         for (res = ailist; res; res = res->ai_next) {
1258                 struct sockaddr_storage ss;
1259
1260                 if (!res->ai_addr || res->ai_addrlen == 0) {
1261                         continue;
1262                 }
1263
1264                 memset(&ss, '\0', sizeof(ss));
1265                 memcpy(&ss, res->ai_addr, res->ai_addrlen);
1266
1267                 *return_count += 1;
1268
1269                 *return_iplist = SMB_REALLOC_ARRAY(*return_iplist,
1270                                                 struct ip_service,
1271                                                 *return_count);
1272                 if (!*return_iplist) {
1273                         DEBUG(3,("resolve_hosts: malloc fail !\n"));
1274                         freeaddrinfo(ailist);
1275                         return NT_STATUS_NO_MEMORY;
1276                 }
1277                 (*return_iplist)[i].ss = ss;
1278                 (*return_iplist)[i].port = PORT_NONE;
1279                 i++;
1280         }
1281         if (ailist) {
1282                 freeaddrinfo(ailist);
1283         }
1284         if (*return_count) {
1285                 return NT_STATUS_OK;
1286         }
1287         return NT_STATUS_UNSUCCESSFUL;
1288 }
1289
1290 /********************************************************
1291  Resolve via "ADS" method.
1292 *********************************************************/
1293
1294 NTSTATUS resolve_ads(const char *name,
1295                         int name_type,
1296                         const char *sitename,
1297                         struct ip_service **return_iplist,
1298                         int *return_count)
1299 {
1300         int                     i, j;
1301         NTSTATUS                status;
1302         TALLOC_CTX              *ctx;
1303         struct dns_rr_srv       *dcs = NULL;
1304         int                     numdcs = 0;
1305         int                     numaddrs = 0;
1306
1307         if ((name_type != 0x1c) && (name_type != KDC_NAME_TYPE) &&
1308             (name_type != 0x1b)) {
1309                 return NT_STATUS_INVALID_PARAMETER;
1310         }
1311
1312         if ( (ctx = talloc_init("resolve_ads")) == NULL ) {
1313                 DEBUG(0,("resolve_ads: talloc_init() failed!\n"));
1314                 return NT_STATUS_NO_MEMORY;
1315         }
1316
1317         /* The DNS code needs fixing to find IPv6 addresses... JRA. */
1318
1319         switch (name_type) {
1320                 case 0x1b:
1321                         DEBUG(5,("resolve_ads: Attempting to resolve "
1322                                  "PDC for %s using DNS\n", name));
1323                         status = ads_dns_query_pdc(ctx, name, &dcs, &numdcs);
1324                         break;
1325
1326                 case 0x1c:
1327                         DEBUG(5,("resolve_ads: Attempting to resolve "
1328                                  "DCs for %s using DNS\n", name));
1329                         status = ads_dns_query_dcs(ctx, name, sitename, &dcs,
1330                                                    &numdcs);
1331                         break;
1332                 case KDC_NAME_TYPE:
1333                         DEBUG(5,("resolve_ads: Attempting to resolve "
1334                                  "KDCs for %s using DNS\n", name));
1335                         status = ads_dns_query_kdcs(ctx, name, sitename, &dcs,
1336                                                     &numdcs);
1337                         break;
1338                 default:
1339                         status = NT_STATUS_INVALID_PARAMETER;
1340                         break;
1341         }
1342
1343         if ( !NT_STATUS_IS_OK( status ) ) {
1344                 talloc_destroy(ctx);
1345                 return status;
1346         }
1347
1348         for (i=0;i<numdcs;i++) {
1349                 numaddrs += MAX(dcs[i].num_ips,1);
1350         }
1351
1352         if ((*return_iplist = SMB_MALLOC_ARRAY(struct ip_service, numaddrs)) ==
1353                         NULL ) {
1354                 DEBUG(0,("resolve_ads: malloc failed for %d entries\n",
1355                                         numaddrs ));
1356                 talloc_destroy(ctx);
1357                 return NT_STATUS_NO_MEMORY;
1358         }
1359
1360         /* now unroll the list of IP addresses */
1361
1362         *return_count = 0;
1363         i = 0;
1364         j = 0;
1365         while ( i < numdcs && (*return_count<numaddrs) ) {
1366                 struct ip_service *r = &(*return_iplist)[*return_count];
1367
1368                 r->port = dcs[i].port;
1369
1370                 /* If we don't have an IP list for a name, lookup it up */
1371
1372                 if (!dcs[i].ss_s) {
1373                         interpret_string_addr(&r->ss, dcs[i].hostname, 0);
1374                         i++;
1375                         j = 0;
1376                 } else {
1377                         /* use the IP addresses from the SRV sresponse */
1378
1379                         if ( j >= dcs[i].num_ips ) {
1380                                 i++;
1381                                 j = 0;
1382                                 continue;
1383                         }
1384
1385                         r->ss = dcs[i].ss_s[j];
1386                         j++;
1387                 }
1388
1389                 /* make sure it is a valid IP.  I considered checking the
1390                  * negative connection cache, but this is the wrong place
1391                  * for it. Maybe only as a hack. After think about it, if
1392                  * all of the IP addresses returned from DNS are dead, what
1393                  * hope does a netbios name lookup have ? The standard reason
1394                  * for falling back to netbios lookups is that our DNS server
1395                  * doesn't know anything about the DC's   -- jerry */
1396
1397                 if (!is_zero_addr(&r->ss)) {
1398                         (*return_count)++;
1399                 }
1400         }
1401
1402         talloc_destroy(ctx);
1403         return NT_STATUS_OK;
1404 }
1405
1406 /*******************************************************************
1407  Internal interface to resolve a name into an IP address.
1408  Use this function if the string is either an IP address, DNS
1409  or host name or NetBIOS name. This uses the name switch in the
1410  smb.conf to determine the order of name resolution.
1411
1412  Added support for ip addr/port to support ADS ldap servers.
1413  the only place we currently care about the port is in the
1414  resolve_hosts() when looking up DC's via SRV RR entries in DNS
1415 **********************************************************************/
1416
1417 NTSTATUS internal_resolve_name(const char *name,
1418                                 int name_type,
1419                                 const char *sitename,
1420                                 struct ip_service **return_iplist,
1421                                 int *return_count,
1422                                 const char *resolve_order)
1423 {
1424         const char *name_resolve_list;
1425         char *tok;
1426         const char *ptr;
1427         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
1428         int i;
1429         TALLOC_CTX *frame = NULL;
1430
1431         *return_iplist = NULL;
1432         *return_count = 0;
1433
1434         DEBUG(10, ("internal_resolve_name: looking up %s#%x (sitename %s)\n",
1435                         name, name_type, sitename ? sitename : NULL));
1436
1437         if (is_ipaddress(name)) {
1438                 if ((*return_iplist = SMB_MALLOC_P(struct ip_service)) ==
1439                                 NULL) {
1440                         DEBUG(0,("internal_resolve_name: malloc fail !\n"));
1441                         return NT_STATUS_NO_MEMORY;
1442                 }
1443
1444                 /* ignore the port here */
1445                 (*return_iplist)->port = PORT_NONE;
1446
1447                 /* if it's in the form of an IP address then get the lib to interpret it */
1448                 if (!interpret_string_addr(&(*return_iplist)->ss,
1449                                         name, AI_NUMERICHOST)) {
1450                         DEBUG(1,("internal_resolve_name: interpret_string_addr "
1451                                 "failed on %s\n",
1452                                 name));
1453                         SAFE_FREE(*return_iplist);
1454                         return NT_STATUS_INVALID_PARAMETER;
1455                 }
1456                 *return_count = 1;
1457                 return NT_STATUS_OK;
1458         }
1459
1460         /* Check name cache */
1461
1462         if (namecache_fetch(name, name_type, return_iplist, return_count)) {
1463                 /* This could be a negative response */
1464                 if (*return_count > 0) {
1465                         return NT_STATUS_OK;
1466                 } else {
1467                         return NT_STATUS_UNSUCCESSFUL;
1468                 }
1469         }
1470
1471         /* set the name resolution order */
1472
1473         if (strcmp( resolve_order, "NULL") == 0) {
1474                 DEBUG(8,("internal_resolve_name: all lookups disabled\n"));
1475                 return NT_STATUS_INVALID_PARAMETER;
1476         }
1477
1478         if (!resolve_order) {
1479                 name_resolve_list = lp_name_resolve_order();
1480         } else {
1481                 name_resolve_list = resolve_order;
1482         }
1483
1484         if (!name_resolve_list[0]) {
1485                 ptr = "host";
1486         } else {
1487                 ptr = name_resolve_list;
1488         }
1489
1490         /* iterate through the name resolution backends */
1491
1492         frame = talloc_stackframe();
1493         while (next_token_talloc(frame, &ptr, &tok, LIST_SEP)) {
1494                 if((strequal(tok, "host") || strequal(tok, "hosts"))) {
1495                         status = resolve_hosts(name, name_type, return_iplist,
1496                                                return_count);
1497                         if (NT_STATUS_IS_OK(status)) {
1498                                 goto done;
1499                         }
1500                 } else if(strequal( tok, "kdc")) {
1501                         /* deal with KDC_NAME_TYPE names here.
1502                          * This will result in a SRV record lookup */
1503                         status = resolve_ads(name, KDC_NAME_TYPE, sitename,
1504                                              return_iplist, return_count);
1505                         if (NT_STATUS_IS_OK(status)) {
1506                                 /* Ensure we don't namecache
1507                                  * this with the KDC port. */
1508                                 name_type = KDC_NAME_TYPE;
1509                                 goto done;
1510                         }
1511                 } else if(strequal( tok, "ads")) {
1512                         /* deal with 0x1c and 0x1b names here.
1513                          * This will result in a SRV record lookup */
1514                         status = resolve_ads(name, name_type, sitename,
1515                                              return_iplist, return_count);
1516                         if (NT_STATUS_IS_OK(status)) {
1517                                 goto done;
1518                         }
1519                 } else if(strequal( tok, "lmhosts")) {
1520                         status = resolve_lmhosts(name, name_type,
1521                                                  return_iplist, return_count);
1522                         if (NT_STATUS_IS_OK(status)) {
1523                                 goto done;
1524                         }
1525                 } else if(strequal( tok, "wins")) {
1526                         /* don't resolve 1D via WINS */
1527                         if (name_type != 0x1D) {
1528                                 status = resolve_wins(name, name_type,
1529                                                       return_iplist,
1530                                                       return_count);
1531                                 if (NT_STATUS_IS_OK(status)) {
1532                                         goto done;
1533                                 }
1534                         }
1535                 } else if(strequal( tok, "bcast")) {
1536                         status = name_resolve_bcast(name, name_type,
1537                                                     return_iplist,
1538                                                     return_count);
1539                         if (NT_STATUS_IS_OK(status)) {
1540                                 goto done;
1541                         }
1542                 } else {
1543                         DEBUG(0,("resolve_name: unknown name switch type %s\n",
1544                                 tok));
1545                 }
1546         }
1547
1548         /* All of the resolve_* functions above have returned false. */
1549
1550         TALLOC_FREE(frame);
1551         SAFE_FREE(*return_iplist);
1552         *return_count = 0;
1553
1554         return NT_STATUS_UNSUCCESSFUL;
1555
1556   done:
1557
1558         /* Remove duplicate entries.  Some queries, notably #1c (domain
1559         controllers) return the PDC in iplist[0] and then all domain
1560         controllers including the PDC in iplist[1..n].  Iterating over
1561         the iplist when the PDC is down will cause two sets of timeouts. */
1562
1563         if ( *return_count ) {
1564                 *return_count = remove_duplicate_addrs2(*return_iplist,
1565                                         *return_count );
1566         }
1567
1568         /* Save in name cache */
1569         if ( DEBUGLEVEL >= 100 ) {
1570                 for (i = 0; i < *return_count && DEBUGLEVEL == 100; i++) {
1571                         char addr[INET6_ADDRSTRLEN];
1572                         print_sockaddr(addr, sizeof(addr),
1573                                         &(*return_iplist)[i].ss);
1574                         DEBUG(100, ("Storing name %s of type %d (%s:%d)\n",
1575                                         name,
1576                                         name_type,
1577                                         addr,
1578                                         (*return_iplist)[i].port));
1579                 }
1580         }
1581
1582         namecache_store(name, name_type, *return_count, *return_iplist);
1583
1584         /* Display some debugging info */
1585
1586         if ( DEBUGLEVEL >= 10 ) {
1587                 DEBUG(10, ("internal_resolve_name: returning %d addresses: ",
1588                                         *return_count));
1589
1590                 for (i = 0; i < *return_count; i++) {
1591                         char addr[INET6_ADDRSTRLEN];
1592                         print_sockaddr(addr, sizeof(addr),
1593                                         &(*return_iplist)[i].ss);
1594                         DEBUGADD(10, ("%s:%d ",
1595                                         addr,
1596                                         (*return_iplist)[i].port));
1597                 }
1598                 DEBUG(10, ("\n"));
1599         }
1600
1601         TALLOC_FREE(frame);
1602         return status;
1603 }
1604
1605 /********************************************************
1606  Internal interface to resolve a name into one IP address.
1607  Use this function if the string is either an IP address, DNS
1608  or host name or NetBIOS name. This uses the name switch in the
1609  smb.conf to determine the order of name resolution.
1610 *********************************************************/
1611
1612 bool resolve_name(const char *name,
1613                 struct sockaddr_storage *return_ss,
1614                 int name_type)
1615 {
1616         struct ip_service *ss_list = NULL;
1617         char *sitename = NULL;
1618         int count = 0;
1619
1620         if (is_ipaddress(name)) {
1621                 return interpret_string_addr(return_ss, name, AI_NUMERICHOST);
1622         }
1623
1624         sitename = sitename_fetch(lp_realm()); /* wild guess */
1625
1626         if (NT_STATUS_IS_OK(internal_resolve_name(name, name_type, sitename,
1627                                                   &ss_list, &count,
1628                                                   lp_name_resolve_order()))) {
1629                 int i;
1630
1631                 /* only return valid addresses for TCP connections */
1632                 for (i=0; i<count; i++) {
1633                         if (!is_zero_addr(&ss_list[i].ss) &&
1634                                         !is_broadcast_addr(&ss_list[i].ss)) {
1635                                 *return_ss = ss_list[i].ss;
1636                                 SAFE_FREE(ss_list);
1637                                 SAFE_FREE(sitename);
1638                                 return True;
1639                         }
1640                 }
1641         }
1642
1643         SAFE_FREE(ss_list);
1644         SAFE_FREE(sitename);
1645         return False;
1646 }
1647
1648 /********************************************************
1649  Find the IP address of the master browser or DMB for a workgroup.
1650 *********************************************************/
1651
1652 bool find_master_ip(const char *group, struct sockaddr_storage *master_ss)
1653 {
1654         struct ip_service *ip_list = NULL;
1655         int count = 0;
1656         NTSTATUS status;
1657
1658         if (lp_disable_netbios()) {
1659                 DEBUG(5,("find_master_ip(%s): netbios is disabled\n", group));
1660                 return false;
1661         }
1662
1663         status = internal_resolve_name(group, 0x1D, NULL, &ip_list, &count,
1664                                        lp_name_resolve_order());
1665         if (NT_STATUS_IS_OK(status)) {
1666                 *master_ss = ip_list[0].ss;
1667                 SAFE_FREE(ip_list);
1668                 return true;
1669         }
1670
1671         status = internal_resolve_name(group, 0x1B, NULL, &ip_list, &count,
1672                                        lp_name_resolve_order());
1673         if (NT_STATUS_IS_OK(status)) {
1674                 *master_ss = ip_list[0].ss;
1675                 SAFE_FREE(ip_list);
1676                 return true;
1677         }
1678
1679         SAFE_FREE(ip_list);
1680         return false;
1681 }
1682
1683 /********************************************************
1684  Get the IP address list of the primary domain controller
1685  for a domain.
1686 *********************************************************/
1687
1688 bool get_pdc_ip(const char *domain, struct sockaddr_storage *pss)
1689 {
1690         struct ip_service *ip_list = NULL;
1691         int count = 0;
1692         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1693
1694         /* Look up #1B name */
1695
1696         if (lp_security() == SEC_ADS) {
1697                 status = internal_resolve_name(domain, 0x1b, NULL, &ip_list,
1698                                                &count, "ads");
1699         }
1700
1701         if (!NT_STATUS_IS_OK(status) || count == 0) {
1702                 status = internal_resolve_name(domain, 0x1b, NULL, &ip_list,
1703                                                &count,
1704                                                lp_name_resolve_order());
1705                 if (!NT_STATUS_IS_OK(status)) {
1706                         return false;
1707                 }
1708         }
1709
1710         /* if we get more than 1 IP back we have to assume it is a
1711            multi-homed PDC and not a mess up */
1712
1713         if ( count > 1 ) {
1714                 DEBUG(6,("get_pdc_ip: PDC has %d IP addresses!\n", count));
1715                 sort_service_list(ip_list, count);
1716         }
1717
1718         *pss = ip_list[0].ss;
1719         SAFE_FREE(ip_list);
1720         return true;
1721 }
1722
1723 /* Private enum type for lookups. */
1724
1725 enum dc_lookup_type { DC_NORMAL_LOOKUP, DC_ADS_ONLY, DC_KDC_ONLY };
1726
1727 /********************************************************
1728  Get the IP address list of the domain controllers for
1729  a domain.
1730 *********************************************************/
1731
1732 static NTSTATUS get_dc_list(const char *domain,
1733                         const char *sitename,
1734                         struct ip_service **ip_list,
1735                         int *count,
1736                         enum dc_lookup_type lookup_type,
1737                         bool *ordered)
1738 {
1739         char *resolve_order = NULL;
1740         char *saf_servername = NULL;
1741         char *pserver = NULL;
1742         const char *p;
1743         char *port_str = NULL;
1744         int port;
1745         char *name;
1746         int num_addresses = 0;
1747         int  local_count, i, j;
1748         struct ip_service *return_iplist = NULL;
1749         struct ip_service *auto_ip_list = NULL;
1750         bool done_auto_lookup = false;
1751         int auto_count = 0;
1752         NTSTATUS status;
1753         TALLOC_CTX *ctx = talloc_init("get_dc_list");
1754
1755         if (!ctx) {
1756                 return NT_STATUS_NO_MEMORY;
1757         }
1758
1759         *ordered = False;
1760
1761         /* if we are restricted to solely using DNS for looking
1762            up a domain controller, make sure that host lookups
1763            are enabled for the 'name resolve order'.  If host lookups
1764            are disabled and ads_only is True, then set the string to
1765            NULL. */
1766
1767         resolve_order = talloc_strdup(ctx, lp_name_resolve_order());
1768         if (!resolve_order) {
1769                 status = NT_STATUS_NO_MEMORY;
1770                 goto out;
1771         }
1772         strlower_m(resolve_order);
1773         if (lookup_type == DC_ADS_ONLY)  {
1774                 if (strstr( resolve_order, "host")) {
1775                         resolve_order = talloc_strdup(ctx, "ads");
1776
1777                         /* DNS SRV lookups used by the ads resolver
1778                            are already sorted by priority and weight */
1779                         *ordered = true;
1780                 } else {
1781                         resolve_order = talloc_strdup(ctx, "NULL");
1782                 }
1783         } else if (lookup_type == DC_KDC_ONLY) {
1784                 /* DNS SRV lookups used by the ads/kdc resolver
1785                    are already sorted by priority and weight */
1786                 *ordered = true;
1787                 resolve_order = talloc_strdup(ctx, "kdc");
1788         }
1789         if (!resolve_order) {
1790                 status = NT_STATUS_NO_MEMORY;
1791                 goto out;
1792         }
1793
1794         /* fetch the server we have affinity for.  Add the
1795            'password server' list to a search for our domain controllers */
1796
1797         saf_servername = saf_fetch( domain);
1798
1799         if (strequal(domain, lp_workgroup()) || strequal(domain, lp_realm())) {
1800                 pserver = talloc_asprintf(NULL, "%s, %s",
1801                         saf_servername ? saf_servername : "",
1802                         lp_passwordserver());
1803         } else {
1804                 pserver = talloc_asprintf(NULL, "%s, *",
1805                         saf_servername ? saf_servername : "");
1806         }
1807
1808         SAFE_FREE(saf_servername);
1809         if (!pserver) {
1810                 status = NT_STATUS_NO_MEMORY;
1811                 goto out;
1812         }
1813
1814         /* if we are starting from scratch, just lookup DOMAIN<0x1c> */
1815
1816         if (!*pserver ) {
1817                 DEBUG(10,("get_dc_list: no preferred domain controllers.\n"));
1818                 status = internal_resolve_name(domain, 0x1C, sitename, ip_list,
1819                                              count, resolve_order);
1820                 goto out;
1821         }
1822
1823         DEBUG(3,("get_dc_list: preferred server list: \"%s\"\n", pserver ));
1824
1825         /*
1826          * if '*' appears in the "password server" list then add
1827          * an auto lookup to the list of manually configured
1828          * DC's.  If any DC is listed by name, then the list should be
1829          * considered to be ordered
1830          */
1831
1832         p = pserver;
1833         while (next_token_talloc(ctx, &p, &name, LIST_SEP)) {
1834                 if (strequal(name, "*")) {
1835                         status = internal_resolve_name(domain, 0x1C, sitename,
1836                                                        &auto_ip_list,
1837                                                        &auto_count,
1838                                                        resolve_order);
1839                         if (NT_STATUS_IS_OK(status)) {
1840                                 num_addresses += auto_count;
1841                         }
1842                         done_auto_lookup = true;
1843                         DEBUG(8,("Adding %d DC's from auto lookup\n",
1844                                                 auto_count));
1845                 } else  {
1846                         num_addresses++;
1847                 }
1848         }
1849
1850         /* if we have no addresses and haven't done the auto lookup, then
1851            just return the list of DC's.  Or maybe we just failed. */
1852
1853         if ((num_addresses == 0)) {
1854                 if (done_auto_lookup) {
1855                         DEBUG(4,("get_dc_list: no servers found\n"));
1856                         status = NT_STATUS_NO_LOGON_SERVERS;
1857                         goto out;
1858                 }
1859                 status = internal_resolve_name(domain, 0x1C, sitename, ip_list,
1860                                              count, resolve_order);
1861                 goto out;
1862         }
1863
1864         if ((return_iplist = SMB_MALLOC_ARRAY(struct ip_service,
1865                                         num_addresses)) == NULL) {
1866                 DEBUG(3,("get_dc_list: malloc fail !\n"));
1867                 status = NT_STATUS_NO_MEMORY;
1868                 goto out;
1869         }
1870
1871         p = pserver;
1872         local_count = 0;
1873
1874         /* fill in the return list now with real IP's */
1875
1876         while ((local_count<num_addresses) &&
1877                         next_token_talloc(ctx, &p, &name, LIST_SEP)) {
1878                 struct sockaddr_storage name_ss;
1879
1880                 /* copy any addersses from the auto lookup */
1881
1882                 if (strequal(name, "*")) {
1883                         for (j=0; j<auto_count; j++) {
1884                                 char addr[INET6_ADDRSTRLEN];
1885                                 print_sockaddr(addr,
1886                                                 sizeof(addr),
1887                                                 &auto_ip_list[j].ss);
1888                                 /* Check for and don't copy any
1889                                  * known bad DC IP's. */
1890                                 if(!NT_STATUS_IS_OK(check_negative_conn_cache(
1891                                                 domain,
1892                                                 addr))) {
1893                                         DEBUG(5,("get_dc_list: "
1894                                                 "negative entry %s removed "
1895                                                 "from DC list\n",
1896                                                 addr));
1897                                         continue;
1898                                 }
1899                                 return_iplist[local_count].ss =
1900                                         auto_ip_list[j].ss;
1901                                 return_iplist[local_count].port =
1902                                         auto_ip_list[j].port;
1903                                 local_count++;
1904                         }
1905                         continue;
1906                 }
1907
1908                 /* added support for address:port syntax for ads
1909                  * (not that I think anyone will ever run the LDAP
1910                  * server in an AD domain on something other than
1911                  * port 389 */
1912
1913                 port = (lp_security() == SEC_ADS) ? LDAP_PORT : PORT_NONE;
1914                 if ((port_str=strchr(name, ':')) != NULL) {
1915                         *port_str = '\0';
1916                         port_str++;
1917                         port = atoi(port_str);
1918                 }
1919
1920                 /* explicit lookup; resolve_name() will
1921                  * handle names & IP addresses */
1922                 if (resolve_name( name, &name_ss, 0x20 )) {
1923                         char addr[INET6_ADDRSTRLEN];
1924                         print_sockaddr(addr,
1925                                         sizeof(addr),
1926                                         &name_ss);
1927
1928                         /* Check for and don't copy any known bad DC IP's. */
1929                         if( !NT_STATUS_IS_OK(check_negative_conn_cache(domain,
1930                                                         addr)) ) {
1931                                 DEBUG(5,("get_dc_list: negative entry %s "
1932                                         "removed from DC list\n",
1933                                         name ));
1934                                 continue;
1935                         }
1936
1937                         return_iplist[local_count].ss = name_ss;
1938                         return_iplist[local_count].port = port;
1939                         local_count++;
1940                         *ordered = true;
1941                 }
1942         }
1943
1944         /* need to remove duplicates in the list if we have any
1945            explicit password servers */
1946
1947         if (local_count) {
1948                 local_count = remove_duplicate_addrs2(return_iplist,
1949                                 local_count );
1950         }
1951
1952         if ( DEBUGLEVEL >= 4 ) {
1953                 DEBUG(4,("get_dc_list: returning %d ip addresses "
1954                                 "in an %sordered list\n",
1955                                 local_count,
1956                                 *ordered ? "":"un"));
1957                 DEBUG(4,("get_dc_list: "));
1958                 for ( i=0; i<local_count; i++ ) {
1959                         char addr[INET6_ADDRSTRLEN];
1960                         print_sockaddr(addr,
1961                                         sizeof(addr),
1962                                         &return_iplist[i].ss);
1963                         DEBUGADD(4,("%s:%d ", addr, return_iplist[i].port ));
1964                 }
1965                 DEBUGADD(4,("\n"));
1966         }
1967
1968         *ip_list = return_iplist;
1969         *count = local_count;
1970
1971         status = ( *count != 0 ? NT_STATUS_OK : NT_STATUS_NO_LOGON_SERVERS );
1972
1973   out:
1974
1975         SAFE_FREE(auto_ip_list);
1976         TALLOC_FREE(ctx);
1977         return status;
1978 }
1979
1980 /*********************************************************************
1981  Small wrapper function to get the DC list and sort it if neccessary.
1982 *********************************************************************/
1983
1984 NTSTATUS get_sorted_dc_list( const char *domain,
1985                         const char *sitename,
1986                         struct ip_service **ip_list,
1987                         int *count,
1988                         bool ads_only )
1989 {
1990         bool ordered;
1991         NTSTATUS status;
1992         enum dc_lookup_type lookup_type = DC_NORMAL_LOOKUP;
1993
1994         DEBUG(8,("get_sorted_dc_list: attempting lookup "
1995                 "for name %s (sitename %s) using [%s]\n",
1996                 domain,
1997                 sitename ? sitename : "NULL",
1998                 (ads_only ? "ads" : lp_name_resolve_order())));
1999
2000         if (ads_only) {
2001                 lookup_type = DC_ADS_ONLY;
2002         }
2003
2004         status = get_dc_list(domain, sitename, ip_list,
2005                         count, lookup_type, &ordered);
2006         if (!NT_STATUS_IS_OK(status)) {
2007                 return status;
2008         }
2009
2010         /* only sort if we don't already have an ordered list */
2011         if (!ordered) {
2012                 sort_service_list(*ip_list, *count);
2013         }
2014
2015         return NT_STATUS_OK;
2016 }
2017
2018 /*********************************************************************
2019  Get the KDC list - re-use all the logic in get_dc_list.
2020 *********************************************************************/
2021
2022 NTSTATUS get_kdc_list( const char *realm,
2023                         const char *sitename,
2024                         struct ip_service **ip_list,
2025                         int *count)
2026 {
2027         bool ordered;
2028         NTSTATUS status;
2029
2030         *count = 0;
2031         *ip_list = NULL;
2032
2033         status = get_dc_list(realm, sitename, ip_list,
2034                         count, DC_KDC_ONLY, &ordered);
2035
2036         if (!NT_STATUS_IS_OK(status)) {
2037                 return status;
2038         }
2039
2040         /* only sort if we don't already have an ordered list */
2041         if ( !ordered ) {
2042                 sort_service_list(*ip_list, *count);
2043         }
2044
2045         return NT_STATUS_OK;
2046 }