source3/libsmb/dsgetdcname.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    dsgetdcname
   5
   6    Copyright (C) Gerald Carter 2006
   7    Copyright (C) Guenther Deschner 2007-2008
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "libsmb/dsgetdcname.h"
  25 #include "libsmb/namequery.h"
  26 #include "libads/sitename_cache.h"
  27 #include "../librpc/gen_ndr/ndr_netlogon.h"
  28 #include "libads/cldap.h"
  29 #include "lib/addns/dnsquery_srv.h"
  30 #include "libsmb/clidgram.h"
  31 #include "lib/gencache.h"
  32 #include "lib/util/util_net.h"
  33
  34 /* 15 minutes */
  35 #define DSGETDCNAME_CACHE_TTL   60*15
  36
  37 struct ip_service_name {
  38         struct samba_sockaddr sa;
  39         const char *hostname;
  40 };
  41
  42 static NTSTATUS make_dc_info_from_cldap_reply(
  43         TALLOC_CTX *mem_ctx,
  44         uint32_t flags,
  45         const struct samba_sockaddr *sa,
  46         struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
  47         struct netr_DsRGetDCNameInfo **info);
  48
  49 /****************************************************************
  50 ****************************************************************/
  51
  52 static void debug_dsdcinfo_flags(int lvl, uint32_t flags)
  53 {
  54         DEBUG(lvl,("debug_dsdcinfo_flags: 0x%08x\n\t", flags));
  55
  56         if (flags & DS_FORCE_REDISCOVERY)
  57                 DEBUGADD(lvl,("DS_FORCE_REDISCOVERY "));
  58         if (flags & 0x00000002)
  59                 DEBUGADD(lvl,("0x00000002 "));
  60         if (flags & 0x00000004)
  61                 DEBUGADD(lvl,("0x00000004 "));
  62         if (flags & 0x00000008)
  63                 DEBUGADD(lvl,("0x00000008 "));
  64         if (flags & DS_DIRECTORY_SERVICE_REQUIRED)
  65                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_REQUIRED "));
  66         if (flags & DS_DIRECTORY_SERVICE_PREFERRED)
  67                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_PREFERRED "));
  68         if (flags & DS_GC_SERVER_REQUIRED)
  69                 DEBUGADD(lvl,("DS_GC_SERVER_REQUIRED "));
  70         if (flags & DS_PDC_REQUIRED)
  71                 DEBUGADD(lvl,("DS_PDC_REQUIRED "));
  72         if (flags & DS_BACKGROUND_ONLY)
  73                 DEBUGADD(lvl,("DS_BACKGROUND_ONLY "));
  74         if (flags & DS_IP_REQUIRED)
  75                 DEBUGADD(lvl,("DS_IP_REQUIRED "));
  76         if (flags & DS_KDC_REQUIRED)
  77                 DEBUGADD(lvl,("DS_KDC_REQUIRED "));
  78         if (flags & DS_TIMESERV_REQUIRED)
  79                 DEBUGADD(lvl,("DS_TIMESERV_REQUIRED "));
  80         if (flags & DS_WRITABLE_REQUIRED)
  81                 DEBUGADD(lvl,("DS_WRITABLE_REQUIRED "));
  82         if (flags & DS_GOOD_TIMESERV_PREFERRED)
  83                 DEBUGADD(lvl,("DS_GOOD_TIMESERV_PREFERRED "));
  84         if (flags & DS_AVOID_SELF)
  85                 DEBUGADD(lvl,("DS_AVOID_SELF "));
  86         if (flags & DS_ONLY_LDAP_NEEDED)
  87                 DEBUGADD(lvl,("DS_ONLY_LDAP_NEEDED "));
  88         if (flags & DS_IS_FLAT_NAME)
  89                 DEBUGADD(lvl,("DS_IS_FLAT_NAME "));
  90         if (flags & DS_IS_DNS_NAME)
  91                 DEBUGADD(lvl,("DS_IS_DNS_NAME "));
  92         if (flags & DS_TRY_NEXTCLOSEST_SITE)
  93                 DEBUGADD(lvl,("DS_TRY_NEXTCLOSEST_SITE "));
  94         if (flags & DS_DIRECTORY_SERVICE_6_REQUIRED)
  95                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_6_REQUIRED "));
  96         if (flags & DS_WEB_SERVICE_REQUIRED)
  97                 DEBUGADD(lvl,("DS_WEB_SERVICE_REQUIRED "));
  98         if (flags & DS_DIRECTORY_SERVICE_8_REQUIRED)
  99                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_8_REQUIRED "));
 100         if (flags & DS_DIRECTORY_SERVICE_9_REQUIRED)
 101                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_9_REQUIRED "));
 102         if (flags & DS_DIRECTORY_SERVICE_10_REQUIRED)
 103                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_10_REQUIRED "));
 104         if (flags & 0x01000000)
 105                 DEBUGADD(lvl,("0x01000000 "));
 106         if (flags & 0x02000000)
 107                 DEBUGADD(lvl,("0x02000000 "));
 108         if (flags & 0x04000000)
 109                 DEBUGADD(lvl,("0x04000000 "));
 110         if (flags & 0x08000000)
 111                 DEBUGADD(lvl,("0x08000000 "));
 112         if (flags & 0x10000000)
 113                 DEBUGADD(lvl,("0x10000000 "));
 114         if (flags & 0x20000000)
 115                 DEBUGADD(lvl,("0x20000000 "));
 116         if (flags & DS_RETURN_DNS_NAME)
 117                 DEBUGADD(lvl,("DS_RETURN_DNS_NAME "));
 118         if (flags & DS_RETURN_FLAT_NAME)
 119                 DEBUGADD(lvl,("DS_RETURN_FLAT_NAME "));
 120         if (flags)
 121                 DEBUGADD(lvl,("\n"));
 122 }
 123
 124 /****************************************************************
 125 ****************************************************************/
 126
 127 static char *dsgetdcname_cache_key(TALLOC_CTX *mem_ctx, const char *domain)
 128 {
 129         if (!domain) {
 130                 return NULL;
 131         }
 132
 133         return talloc_asprintf_strupper_m(mem_ctx, "DSGETDCNAME/DOMAIN/%s",
 134                                           domain);
 135 }
 136
 137 /****************************************************************
 138 ****************************************************************/
 139
 140 static NTSTATUS dsgetdcname_cache_delete(TALLOC_CTX *mem_ctx,
 141                                         const char *domain_name)
 142 {
 143         char *key;
 144
 145         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 146         if (!key) {
 147                 return NT_STATUS_NO_MEMORY;
 148         }
 149
 150         if (!gencache_del(key)) {
 151                 return NT_STATUS_UNSUCCESSFUL;
 152         }
 153
 154         return NT_STATUS_OK;
 155 }
 156
 157 /****************************************************************
 158 ****************************************************************/
 159
 160 static NTSTATUS dsgetdcname_cache_store(TALLOC_CTX *mem_ctx,
 161                                         const char *domain_name,
 162                                         DATA_BLOB blob)
 163 {
 164         time_t expire_time;
 165         char *key;
 166         bool ret = false;
 167
 168         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 169         if (!key) {
 170                 return NT_STATUS_NO_MEMORY;
 171         }
 172
 173         expire_time = time(NULL) + DSGETDCNAME_CACHE_TTL;
 174
 175         ret = gencache_set_data_blob(key, blob, expire_time);
 176
 177         return ret ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
 178 }
 179
 180 /****************************************************************
 181 ****************************************************************/
 182
 183 static NTSTATUS store_cldap_reply(TALLOC_CTX *mem_ctx,
 184                                   uint32_t flags,
 185                                   struct samba_sockaddr *sa,
 186                                   uint32_t nt_version,
 187                                   struct NETLOGON_SAM_LOGON_RESPONSE_EX *r)
 188 {
 189         DATA_BLOB blob;
 190         enum ndr_err_code ndr_err;
 191         NTSTATUS status;
 192         char addr[INET6_ADDRSTRLEN];
 193
 194         print_sockaddr(addr, sizeof(addr), &sa->u.ss);
 195
 196         /* FIXME */
 197         r->sockaddr_size = 0x10; /* the w32 winsock addr size */
 198         r->sockaddr.sockaddr_family = 2; /* AF_INET */
 199         if (is_ipaddress_v4(addr)) {
 200                 r->sockaddr.pdc_ip = talloc_strdup(mem_ctx, addr);
 201                 if (r->sockaddr.pdc_ip == NULL) {
 202                         return NT_STATUS_NO_MEMORY;
 203                 }
 204         } else {
 205                 /*
 206                  * ndr_push_NETLOGON_SAM_LOGON_RESPONSE_EX will
 207                  * fail with an ipv6 address.
 208                  *
 209                  * This matches windows behaviour in the CLDAP
 210                  * response when NETLOGON_NT_VERSION_5EX_WITH_IP
 211                  * is used.
 212                  *
 213                  * Windows returns the ipv4 address of the ipv6
 214                  * server interface and falls back to 127.0.0.1
 215                  * if there's no ipv4 address.
 216                  */
 217                 r->sockaddr.pdc_ip = talloc_strdup(mem_ctx, "127.0.0.1");
 218                 if (r->sockaddr.pdc_ip == NULL) {
 219                         return NT_STATUS_NO_MEMORY;
 220                 }
 221         }
 222
 223         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, r,
 224                        (ndr_push_flags_fn_t)ndr_push_NETLOGON_SAM_LOGON_RESPONSE_EX);
 225         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 226                 return ndr_map_error2ntstatus(ndr_err);
 227         }
 228
 229         if (r->domain_name) {
 230                 status = dsgetdcname_cache_store(mem_ctx, r->domain_name,
 231                                                  blob);
 232                 if (!NT_STATUS_IS_OK(status)) {
 233                         goto done;
 234                 }
 235                 if (r->client_site) {
 236                         sitename_store(r->domain_name, r->client_site);
 237                 }
 238         }
 239         if (r->dns_domain) {
 240                 status = dsgetdcname_cache_store(mem_ctx, r->dns_domain, blob);
 241                 if (!NT_STATUS_IS_OK(status)) {
 242                         goto done;
 243                 }
 244                 if (r->client_site) {
 245                         sitename_store(r->dns_domain, r->client_site);
 246                 }
 247         }
 248
 249         status = NT_STATUS_OK;
 250
 251  done:
 252         data_blob_free(&blob);
 253
 254         return status;
 255 }
 256
 257 /****************************************************************
 258 ****************************************************************/
 259
 260 static uint32_t get_cldap_reply_server_flags(struct netlogon_samlogon_response *r,
 261                                              uint32_t nt_version)
 262 {
 263         switch (nt_version & 0x0000001f) {
 264                 case 0:
 265                 case 1:
 266                 case 16:
 267                 case 17:
 268                         return 0;
 269                 case 2:
 270                 case 3:
 271                 case 18:
 272                 case 19:
 273                         return r->data.nt5.server_type;
 274                 case 4:
 275                 case 5:
 276                 case 6:
 277                 case 7:
 278                         return r->data.nt5_ex.server_type;
 279                 case 8:
 280                 case 9:
 281                 case 10:
 282                 case 11:
 283                 case 12:
 284                 case 13:
 285                 case 14:
 286                 case 15:
 287                         return r->data.nt5_ex.server_type;
 288                 case 20:
 289                 case 21:
 290                 case 22:
 291                 case 23:
 292                 case 24:
 293                 case 25:
 294                 case 26:
 295                 case 27:
 296                 case 28:
 297                         return r->data.nt5_ex.server_type;
 298                 case 29:
 299                 case 30:
 300                 case 31:
 301                         return r->data.nt5_ex.server_type;
 302                 default:
 303                         return 0;
 304         }
 305 }
 306
 307 /****************************************************************
 308 ****************************************************************/
 309
 310 static NTSTATUS dsgetdcname_cache_fetch(TALLOC_CTX *mem_ctx,
 311                                         const char *domain_name,
 312                                         const struct GUID *domain_guid,
 313                                         uint32_t flags,
 314                                         struct netr_DsRGetDCNameInfo **info_p)
 315 {
 316         char *key;
 317         DATA_BLOB blob;
 318         enum ndr_err_code ndr_err;
 319         struct netr_DsRGetDCNameInfo *info;
 320         struct NETLOGON_SAM_LOGON_RESPONSE_EX r;
 321         NTSTATUS status;
 322
 323         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 324         if (!key) {
 325                 return NT_STATUS_NO_MEMORY;
 326         }
 327
 328         if (!gencache_get_data_blob(key, NULL, &blob, NULL, NULL)) {
 329                 return NT_STATUS_NOT_FOUND;
 330         }
 331
 332         info = talloc_zero(mem_ctx, struct netr_DsRGetDCNameInfo);
 333         if (!info) {
 334                 data_blob_free(&blob);
 335                 return NT_STATUS_NO_MEMORY;
 336         }
 337
 338         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &r,
 339                       (ndr_pull_flags_fn_t)ndr_pull_NETLOGON_SAM_LOGON_RESPONSE_EX);
 340
 341         data_blob_free(&blob);
 342         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 343                 dsgetdcname_cache_delete(mem_ctx, domain_name);
 344                 return ndr_map_error2ntstatus(ndr_err);
 345         }
 346
 347         status = make_dc_info_from_cldap_reply(mem_ctx, flags, NULL,
 348                                                &r, &info);
 349         if (!NT_STATUS_IS_OK(status)) {
 350                 return status;
 351         }
 352
 353         if (DEBUGLEVEL >= 10) {
 354                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, info);
 355         }
 356
 357         /* check flags */
 358         if (!check_cldap_reply_required_flags(info->dc_flags, flags)) {
 359                 DEBUG(10,("invalid flags\n"));
 360                 return NT_STATUS_INVALID_PARAMETER;
 361         }
 362
 363         if ((flags & DS_IP_REQUIRED) &&
 364             (info->dc_address_type != DS_ADDRESS_TYPE_INET)) {
 365                 return NT_STATUS_INVALID_PARAMETER_MIX;
 366         }
 367
 368         *info_p = info;
 369
 370         return NT_STATUS_OK;
 371 }
 372
 373 /****************************************************************
 374 ****************************************************************/
 375
 376 static NTSTATUS dsgetdcname_cached(TALLOC_CTX *mem_ctx,
 377                                    struct messaging_context *msg_ctx,
 378                                    const char *domain_name,
 379                                    const struct GUID *domain_guid,
 380                                    uint32_t flags,
 381                                    const char *site_name,
 382                                    struct netr_DsRGetDCNameInfo **info)
 383 {
 384         NTSTATUS status;
 385
 386         status = dsgetdcname_cache_fetch(mem_ctx, domain_name, domain_guid,
 387                                          flags, info);
 388         if (!NT_STATUS_IS_OK(status)
 389             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 390                 DEBUG(10,("dsgetdcname_cached: cache fetch failed with: %s\n",
 391                         nt_errstr(status)));
 392                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 393         }
 394
 395         if (flags & DS_BACKGROUND_ONLY) {
 396                 return status;
 397         }
 398
 399         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 400                 struct netr_DsRGetDCNameInfo *dc_info;
 401
 402                 status = dsgetdcname(mem_ctx, msg_ctx, domain_name,
 403                                      domain_guid, site_name,
 404                                      flags | DS_FORCE_REDISCOVERY,
 405                                      &dc_info);
 406
 407                 if (!NT_STATUS_IS_OK(status)) {
 408                         return status;
 409                 }
 410
 411                 *info = dc_info;
 412         }
 413
 414         return status;
 415 }
 416
 417 /****************************************************************
 418 ****************************************************************/
 419
 420 static bool check_allowed_required_flags(uint32_t flags,
 421                                          const char *site_name)
 422 {
 423         uint32_t return_type = flags & (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME);
 424         uint32_t offered_type = flags & (DS_IS_FLAT_NAME|DS_IS_DNS_NAME);
 425         uint32_t query_type = flags & (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY);
 426
 427         /* FIXME: check for DSGETDC_VALID_FLAGS and check for exclusive bits
 428          * (DS_PDC_REQUIRED, DS_KDC_REQUIRED, DS_GC_SERVER_REQUIRED) */
 429
 430         debug_dsdcinfo_flags(10, flags);
 431
 432         if ((flags & DS_TRY_NEXTCLOSEST_SITE) && site_name) {
 433                 return false;
 434         }
 435
 436         if (return_type == (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME)) {
 437                 return false;
 438         }
 439
 440         if (offered_type == (DS_IS_DNS_NAME|DS_IS_FLAT_NAME)) {
 441                 return false;
 442         }
 443
 444         if (query_type == (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY)) {
 445                 return false;
 446         }
 447
 448 #if 0
 449         if ((flags & DS_RETURN_DNS_NAME) && (!(flags & DS_IP_REQUIRED))) {
 450                 printf("gd: here5 \n");
 451                 return false;
 452         }
 453 #endif
 454         return true;
 455 }
 456
 457 /****************************************************************
 458 ****************************************************************/
 459
 460 static NTSTATUS discover_dc_netbios(TALLOC_CTX *mem_ctx,
 461                                     const char *domain_name,
 462                                     uint32_t flags,
 463                                     struct ip_service_name **returned_dclist,
 464                                     size_t *returned_count)
 465 {
 466         NTSTATUS status;
 467         enum nbt_name_type name_type = NBT_NAME_LOGON;
 468         struct samba_sockaddr *salist = NULL;
 469         size_t i;
 470         struct ip_service_name *dclist = NULL;
 471         size_t count = 0;
 472         static const char *resolve_order[] = { "lmhosts", "wins", "bcast", NULL };
 473
 474         if (flags & DS_PDC_REQUIRED) {
 475                 name_type = NBT_NAME_PDC;
 476         }
 477
 478         status = internal_resolve_name(mem_ctx,
 479                                         domain_name,
 480                                         name_type,
 481                                         NULL,
 482                                         &salist,
 483                                         &count,
 484                                         resolve_order);
 485         if (!NT_STATUS_IS_OK(status)) {
 486                 DEBUG(10,("discover_dc_netbios: failed to find DC\n"));
 487                 return status;
 488         }
 489
 490         dclist = talloc_zero_array(mem_ctx, struct ip_service_name, count);
 491         if (!dclist) {
 492                 TALLOC_FREE(salist);
 493                 return NT_STATUS_NO_MEMORY;
 494         }
 495
 496         for (i=0; i<count; i++) {
 497                 char addr[INET6_ADDRSTRLEN];
 498                 struct ip_service_name *r = &dclist[i];
 499
 500                 print_sockaddr(addr, sizeof(addr),
 501                                &salist[i].u.ss);
 502
 503                 r->sa = salist[i];
 504                 r->hostname = talloc_strdup(mem_ctx, addr);
 505                 if (!r->hostname) {
 506                         TALLOC_FREE(salist);
 507                         TALLOC_FREE(dclist);
 508                         return NT_STATUS_NO_MEMORY;
 509                 }
 510
 511         }
 512
 513         TALLOC_FREE(salist);
 514
 515         *returned_dclist = dclist;
 516         *returned_count = count;
 517
 518         return NT_STATUS_OK;
 519 }
 520
 521 /****************************************************************
 522 ****************************************************************/
 523
 524 static NTSTATUS discover_dc_dns(TALLOC_CTX *mem_ctx,
 525                                 const char *domain_name,
 526                                 const struct GUID *domain_guid,
 527                                 uint32_t flags,
 528                                 const char *site_name,
 529                                 struct ip_service_name **returned_dclist,
 530                                 size_t *return_count)
 531 {
 532         size_t i;
 533         NTSTATUS status;
 534         struct dns_rr_srv *dcs = NULL;
 535         size_t numdcs = 0;
 536         struct ip_service_name *dclist = NULL;
 537         size_t ret_count = 0;
 538         char *query = NULL;
 539
 540         if (flags & DS_PDC_REQUIRED) {
 541                 query = ads_dns_query_string_pdc(mem_ctx, domain_name);
 542         } else if (flags & DS_GC_SERVER_REQUIRED) {
 543                 query = ads_dns_query_string_gcs(mem_ctx, domain_name);
 544         } else if (flags & DS_KDC_REQUIRED) {
 545                 query = ads_dns_query_string_kdcs(mem_ctx, domain_name);
 546         } else if (flags & DS_DIRECTORY_SERVICE_REQUIRED) {
 547                 query = ads_dns_query_string_dcs(mem_ctx, domain_name);
 548         } else if (domain_guid) {
 549                 query = ads_dns_query_string_dcs_guid(
 550                         mem_ctx, domain_guid, domain_name);
 551         } else {
 552                 query = ads_dns_query_string_dcs(mem_ctx, domain_name);
 553         }
 554
 555         if (query == NULL) {
 556                 return NT_STATUS_NO_MEMORY;
 557         }
 558
 559         status = ads_dns_query_srv(
 560                 mem_ctx,
 561                 lp_get_async_dns_timeout(),
 562                 site_name,
 563                 query,
 564                 &dcs,
 565                 &numdcs);
 566         TALLOC_FREE(query);
 567         if (!NT_STATUS_IS_OK(status)) {
 568                 return status;
 569         }
 570
 571         if (numdcs == 0) {
 572                 TALLOC_FREE(dcs);
 573                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 574         }
 575
 576         /* Check for integer wrap. */
 577         if (numdcs + numdcs < numdcs) {
 578                 TALLOC_FREE(dcs);
 579                 return NT_STATUS_INVALID_PARAMETER;
 580         }
 581
 582         /*
 583          * We're only returning up to 2 addresses per
 584          * DC name, so just allocate size numdcs x 2.
 585          */
 586
 587         dclist = talloc_zero_array(mem_ctx,
 588                                    struct ip_service_name,
 589                                    numdcs * 2);
 590         if (!dclist) {
 591                 TALLOC_FREE(dcs);
 592                 return NT_STATUS_NO_MEMORY;
 593         }
 594
 595         /*
 596          * First, copy the SRV record replies that
 597          * have IP addresses returned with them.
 598          */
 599         ret_count = 0;
 600         for (i = 0; i < numdcs; i++) {
 601                 size_t j;
 602                 bool have_v4_addr = false;
 603                 bool have_v6_addr = false;
 604
 605                 if (dcs[i].num_ips == 0) {
 606                         continue;
 607                 }
 608
 609                 /*
 610                  * Pick up to 1 address from each address
 611                  * family (IPv4, IPv6).
 612                  *
 613                  * This is different from the previous
 614                  * code which picked a 'next ip' address
 615                  * each time, incrementing an index.
 616                  * Too complex to maintain :-(.
 617                  */
 618                 for (j = 0; j < dcs[i].num_ips; j++) {
 619                         if ((dcs[i].ss_s[j].ss_family == AF_INET && !have_v4_addr) ||
 620                             (dcs[i].ss_s[j].ss_family == AF_INET6 && !have_v6_addr)) {
 621                                 bool ok;
 622                                 dclist[ret_count].hostname =
 623                                         talloc_strdup(dclist, dcs[i].hostname);
 624                                 ok = sockaddr_storage_to_samba_sockaddr(
 625                                         &dclist[ret_count].sa,
 626                                         &dcs[i].ss_s[j]);
 627                                 if (!ok) {
 628                                         TALLOC_FREE(dcs);
 629                                         TALLOC_FREE(dclist);
 630                                         return NT_STATUS_INVALID_PARAMETER;
 631                                 }
 632                                 ret_count++;
 633                                 if (dcs[i].ss_s[j].ss_family == AF_INET) {
 634                                         have_v4_addr = true;
 635                                 } else {
 636                                         have_v6_addr = true;
 637                                 }
 638                                 if (have_v4_addr && have_v6_addr) {
 639                                         break;
 640                                 }
 641                         }
 642                 }
 643         }
 644
 645         TALLOC_FREE(dcs);
 646
 647         if (ret_count == 0) {
 648                 TALLOC_FREE(dclist);
 649                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 650         }
 651
 652         *returned_dclist = dclist;
 653         *return_count = ret_count;
 654         return NT_STATUS_OK;
 655 }
 656
 657 /****************************************************************
 658 ****************************************************************/
 659
 660 static NTSTATUS make_domain_controller_info(TALLOC_CTX *mem_ctx,
 661                                             const char *dc_unc,
 662                                             const char *dc_address,
 663                                             uint32_t dc_address_type,
 664                                             const struct GUID *domain_guid,
 665                                             const char *domain_name,
 666                                             const char *forest_name,
 667                                             uint32_t flags,
 668                                             const char *dc_site_name,
 669                                             const char *client_site_name,
 670                                             struct netr_DsRGetDCNameInfo **info_out)
 671 {
 672         struct netr_DsRGetDCNameInfo *info;
 673
 674         info = talloc_zero(mem_ctx, struct netr_DsRGetDCNameInfo);
 675         NT_STATUS_HAVE_NO_MEMORY(info);
 676
 677         if (dc_unc) {
 678                 if (!(dc_unc[0] == '\\' && dc_unc[1] == '\\')) {
 679                         info->dc_unc = talloc_asprintf(mem_ctx, "\\\\%s",
 680                                                        dc_unc);
 681                 } else {
 682                         info->dc_unc = talloc_strdup(mem_ctx, dc_unc);
 683                 }
 684                 NT_STATUS_HAVE_NO_MEMORY(info->dc_unc);
 685         }
 686
 687         if (dc_address) {
 688                 if (!(dc_address[0] == '\\' && dc_address[1] == '\\')) {
 689                         info->dc_address = talloc_asprintf(mem_ctx, "\\\\%s",
 690                                                            dc_address);
 691                 } else {
 692                         info->dc_address = talloc_strdup(mem_ctx, dc_address);
 693                 }
 694                 NT_STATUS_HAVE_NO_MEMORY(info->dc_address);
 695         }
 696
 697         info->dc_address_type = dc_address_type;
 698
 699         if (domain_guid) {
 700                 info->domain_guid = *domain_guid;
 701         }
 702
 703         if (domain_name) {
 704                 info->domain_name = talloc_strdup(mem_ctx, domain_name);
 705                 NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
 706         }
 707
 708         if (forest_name && *forest_name) {
 709                 info->forest_name = talloc_strdup(mem_ctx, forest_name);
 710                 NT_STATUS_HAVE_NO_MEMORY(info->forest_name);
 711                 flags |= DS_DNS_FOREST_ROOT;
 712         }
 713
 714         info->dc_flags = flags;
 715
 716         if (dc_site_name) {
 717                 info->dc_site_name = talloc_strdup(mem_ctx, dc_site_name);
 718                 NT_STATUS_HAVE_NO_MEMORY(info->dc_site_name);
 719         }
 720
 721         if (client_site_name) {
 722                 info->client_site_name = talloc_strdup(mem_ctx,
 723                                                        client_site_name);
 724                 NT_STATUS_HAVE_NO_MEMORY(info->client_site_name);
 725         }
 726
 727         *info_out = info;
 728
 729         return NT_STATUS_OK;
 730 }
 731
 732 /****************************************************************
 733 ****************************************************************/
 734
 735 static void map_dc_and_domain_names(uint32_t flags,
 736                                     const char *dc_name,
 737                                     const char *domain_name,
 738                                     const char *dns_dc_name,
 739                                     const char *dns_domain_name,
 740                                     uint32_t *dc_flags,
 741                                     const char **hostname_p,
 742                                     const char **domain_p)
 743 {
 744         switch (flags & 0xf0000000) {
 745                 case DS_RETURN_FLAT_NAME:
 746                         if (dc_name && domain_name &&
 747                             *dc_name && *domain_name) {
 748                                 *hostname_p = dc_name;
 749                                 *domain_p = domain_name;
 750                                 break;
 751                         }
 752
 753                         FALL_THROUGH;
 754                 case DS_RETURN_DNS_NAME:
 755                 default:
 756                         if (dns_dc_name && dns_domain_name &&
 757                             *dns_dc_name && *dns_domain_name) {
 758                                 *hostname_p = dns_dc_name;
 759                                 *domain_p = dns_domain_name;
 760                                 *dc_flags |= DS_DNS_DOMAIN | DS_DNS_CONTROLLER;
 761                                 break;
 762                         }
 763                         if (dc_name && domain_name &&
 764                             *dc_name && *domain_name) {
 765                                 *hostname_p = dc_name;
 766                                 *domain_p = domain_name;
 767                                 break;
 768                         }
 769         }
 770 }
 771
 772 /****************************************************************
 773 ****************************************************************/
 774
 775 static NTSTATUS make_dc_info_from_cldap_reply(
 776         TALLOC_CTX *mem_ctx,
 777         uint32_t flags,
 778         const struct samba_sockaddr *sa,
 779         struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
 780         struct netr_DsRGetDCNameInfo **info)
 781 {
 782         const char *dc_hostname = NULL;
 783         const char *dc_domain_name = NULL;
 784         const char *dc_address = NULL;
 785         const char *dc_forest = NULL;
 786         uint32_t dc_address_type = 0;
 787         uint32_t dc_flags = 0;
 788         struct GUID *dc_domain_guid = NULL;
 789         const char *dc_server_site = NULL;
 790         const char *dc_client_site = NULL;
 791
 792         char addr[INET6_ADDRSTRLEN];
 793
 794         if (sa != NULL) {
 795                 print_sockaddr(addr, sizeof(addr), &sa->u.ss);
 796                 dc_address = addr;
 797                 dc_address_type = DS_ADDRESS_TYPE_INET;
 798         } else {
 799                 if (r->sockaddr.pdc_ip) {
 800                         dc_address      = r->sockaddr.pdc_ip;
 801                         dc_address_type = DS_ADDRESS_TYPE_INET;
 802                 } else {
 803                         dc_address      = r->pdc_name;
 804                         dc_address_type = DS_ADDRESS_TYPE_NETBIOS;
 805                 }
 806         }
 807
 808         map_dc_and_domain_names(flags,
 809                                 r->pdc_name,
 810                                 r->domain_name,
 811                                 r->pdc_dns_name,
 812                                 r->dns_domain,
 813                                 &dc_flags,
 814                                 &dc_hostname,
 815                                 &dc_domain_name);
 816
 817         dc_flags        |= r->server_type;
 818         dc_forest       = r->forest;
 819         dc_domain_guid  = &r->domain_uuid;
 820         dc_server_site  = r->server_site;
 821         dc_client_site  = r->client_site;
 822
 823         return make_domain_controller_info(mem_ctx,
 824                                            dc_hostname,
 825                                            dc_address,
 826                                            dc_address_type,
 827                                            dc_domain_guid,
 828                                            dc_domain_name,
 829                                            dc_forest,
 830                                            dc_flags,
 831                                            dc_server_site,
 832                                            dc_client_site,
 833                                            info);
 834 }
 835
 836 /****************************************************************
 837 ****************************************************************/
 838
 839 static uint32_t map_ds_flags_to_nt_version(uint32_t flags)
 840 {
 841         uint32_t nt_version = 0;
 842
 843         if (flags & DS_PDC_REQUIRED) {
 844                 nt_version |= NETLOGON_NT_VERSION_PDC;
 845         }
 846
 847         if (flags & DS_GC_SERVER_REQUIRED) {
 848                 nt_version |= NETLOGON_NT_VERSION_GC;
 849         }
 850
 851         if (flags & DS_TRY_NEXTCLOSEST_SITE) {
 852                 nt_version |= NETLOGON_NT_VERSION_WITH_CLOSEST_SITE;
 853         }
 854
 855         if (flags & DS_IP_REQUIRED) {
 856                 nt_version |= NETLOGON_NT_VERSION_IP;
 857         }
 858
 859         return nt_version;
 860 }
 861
 862 /****************************************************************
 863 ****************************************************************/
 864
 865 static NTSTATUS process_dc_dns(TALLOC_CTX *mem_ctx,
 866                                const char *domain_name,
 867                                uint32_t flags,
 868                                struct ip_service_name *dclist,
 869                                size_t num_dcs,
 870                                struct netr_DsRGetDCNameInfo **info)
 871 {
 872         size_t i = 0;
 873         bool valid_dc = false;
 874         struct netlogon_samlogon_response *r = NULL;
 875         uint32_t nt_version = NETLOGON_NT_VERSION_5 |
 876                               NETLOGON_NT_VERSION_5EX;
 877         uint32_t ret_flags = 0;
 878         NTSTATUS status;
 879
 880         nt_version |= map_ds_flags_to_nt_version(flags);
 881
 882         for (i=0; i<num_dcs; i++) {
 883                 char addr[INET6_ADDRSTRLEN];
 884
 885                 print_sockaddr(addr, sizeof(addr), &dclist[i].sa.u.ss);
 886
 887                 DEBUG(10,("LDAP ping to %s (%s)\n", dclist[i].hostname, addr));
 888
 889                 if (ads_cldap_netlogon(mem_ctx, &dclist[i].sa.u.ss,
 890                                         domain_name,
 891                                         nt_version,
 892                                         &r))
 893                 {
 894                         nt_version = r->ntver;
 895                         ret_flags = get_cldap_reply_server_flags(r, nt_version);
 896
 897                         if (check_cldap_reply_required_flags(ret_flags, flags)) {
 898                                 valid_dc = true;
 899                                 break;
 900                         }
 901                 }
 902
 903                 continue;
 904         }
 905
 906         if (!valid_dc) {
 907                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 908         }
 909
 910         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].sa,
 911                                                &r->data.nt5_ex, info);
 912         if (NT_STATUS_IS_OK(status)) {
 913                 return store_cldap_reply(mem_ctx, flags, &dclist[i].sa,
 914                                          nt_version, &r->data.nt5_ex);
 915         }
 916
 917         return status;
 918 }
 919
 920 /****************************************************************
 921 ****************************************************************/
 922
 923 /****************************************************************
 924 ****************************************************************/
 925
 926 static NTSTATUS process_dc_netbios(TALLOC_CTX *mem_ctx,
 927                                    struct messaging_context *msg_ctx,
 928                                    const char *domain_name,
 929                                    uint32_t flags,
 930                                    struct ip_service_name *dclist,
 931                                    size_t num_dcs,
 932                                    struct netr_DsRGetDCNameInfo **info)
 933 {
 934         enum nbt_name_type name_type = NBT_NAME_LOGON;
 935         NTSTATUS status;
 936         size_t i;
 937         const char *dc_name = NULL;
 938         fstring tmp_dc_name;
 939         struct netlogon_samlogon_response *r = NULL;
 940         bool store_cache = false;
 941         uint32_t nt_version = NETLOGON_NT_VERSION_1 |
 942                               NETLOGON_NT_VERSION_5 |
 943                               NETLOGON_NT_VERSION_5EX_WITH_IP;
 944         size_t len = strlen(lp_netbios_name());
 945         char my_acct_name[len+2];
 946
 947         if (msg_ctx == NULL) {
 948                 return NT_STATUS_INVALID_PARAMETER;
 949         }
 950
 951         if (flags & DS_PDC_REQUIRED) {
 952                 name_type = NBT_NAME_PDC;
 953         }
 954
 955         /*
 956          * It's 2024 we always want an AD style response!
 957          */
 958         nt_version |= NETLOGON_NT_VERSION_AVOID_NT4EMUL;
 959
 960         nt_version |= map_ds_flags_to_nt_version(flags);
 961
 962         snprintf(my_acct_name,
 963                  sizeof(my_acct_name),
 964                  "%s$",
 965                  lp_netbios_name());
 966
 967         DEBUG(10,("process_dc_netbios\n"));
 968
 969         for (i=0; i<num_dcs; i++) {
 970                 uint16_t val;
 971
 972                 generate_random_buffer((uint8_t *)&val, 2);
 973
 974                 status = nbt_getdc(msg_ctx, 10, &dclist[i].sa.u.ss, domain_name,
 975                                    NULL, my_acct_name, ACB_WSTRUST, nt_version,
 976                                    mem_ctx, &nt_version, &dc_name, &r);
 977                 if (NT_STATUS_IS_OK(status)) {
 978                         store_cache = true;
 979                         namecache_store(dc_name,
 980                                         NBT_NAME_SERVER,
 981                                         1,
 982                                         &dclist[i].sa);
 983                         goto make_reply;
 984                 }
 985
 986                 if (name_status_find(domain_name,
 987                                      name_type,
 988                                      NBT_NAME_SERVER,
 989                                      &dclist[i].sa.u.ss,
 990                                      tmp_dc_name))
 991                 {
 992                         struct NETLOGON_SAM_LOGON_RESPONSE_NT40 logon1;
 993
 994                         r = talloc_zero(mem_ctx, struct netlogon_samlogon_response);
 995                         NT_STATUS_HAVE_NO_MEMORY(r);
 996
 997                         ZERO_STRUCT(logon1);
 998
 999                         nt_version = NETLOGON_NT_VERSION_1;
1000
1001                         logon1.nt_version = nt_version;
1002                         logon1.pdc_name = tmp_dc_name;
1003                         logon1.domain_name = talloc_strdup_upper(mem_ctx, domain_name);
1004                         NT_STATUS_HAVE_NO_MEMORY(logon1.domain_name);
1005
1006                         r->data.nt4 = logon1;
1007                         r->ntver = nt_version;
1008
1009                         map_netlogon_samlogon_response(r);
1010
1011                         namecache_store(tmp_dc_name,
1012                                         NBT_NAME_SERVER,
1013                                         1,
1014                                         &dclist[i].sa);
1015
1016                         goto make_reply;
1017                 }
1018         }
1019
1020         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1021
1022  make_reply:
1023
1024         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].sa,
1025                                                &r->data.nt5_ex, info);
1026         if (NT_STATUS_IS_OK(status) && store_cache) {
1027                 return store_cldap_reply(mem_ctx, flags, &dclist[i].sa,
1028                                          nt_version, &r->data.nt5_ex);
1029         }
1030
1031         return status;
1032 }
1033
1034 /****************************************************************
1035 ****************************************************************/
1036
1037 static NTSTATUS dsgetdcname_rediscover(TALLOC_CTX *mem_ctx,
1038                                        struct messaging_context *msg_ctx,
1039                                        const char *domain_name,
1040                                        const struct GUID *domain_guid,
1041                                        uint32_t flags,
1042                                        const char *site_name,
1043                                        struct netr_DsRGetDCNameInfo **info)
1044 {
1045         NTSTATUS status;
1046         struct ip_service_name *dclist = NULL;
1047         size_t num_dcs = 0;
1048
1049         DEBUG(10,("dsgetdcname_rediscover\n"));
1050
1051         if (flags & DS_IS_FLAT_NAME) {
1052
1053                 if (lp_disable_netbios()) {
1054                         return NT_STATUS_NOT_SUPPORTED;
1055                 }
1056
1057                 status = discover_dc_netbios(mem_ctx, domain_name, flags,
1058                                              &dclist, &num_dcs);
1059                 NT_STATUS_NOT_OK_RETURN(status);
1060
1061                 return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags,
1062                                           dclist, num_dcs, info);
1063         }
1064
1065         if (flags & DS_IS_DNS_NAME) {
1066
1067                 status = discover_dc_dns(mem_ctx, domain_name, domain_guid,
1068                                          flags, site_name, &dclist, &num_dcs);
1069                 NT_STATUS_NOT_OK_RETURN(status);
1070
1071                 return process_dc_dns(mem_ctx, domain_name, flags,
1072                                       dclist, num_dcs, info);
1073         }
1074
1075         status = discover_dc_dns(mem_ctx, domain_name, domain_guid, flags,
1076                                  site_name, &dclist, &num_dcs);
1077
1078         if (NT_STATUS_IS_OK(status) && num_dcs != 0) {
1079
1080                 status = process_dc_dns(mem_ctx, domain_name, flags, dclist,
1081                                         num_dcs, info);
1082                 if (NT_STATUS_IS_OK(status)) {
1083                         return status;
1084                 }
1085         }
1086
1087         if (lp_disable_netbios()) {
1088                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1089         }
1090
1091         status = discover_dc_netbios(mem_ctx, domain_name, flags, &dclist,
1092                                      &num_dcs);
1093         NT_STATUS_NOT_OK_RETURN(status);
1094
1095         return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags, dclist,
1096                                   num_dcs, info);
1097 }
1098
1099 static bool is_closest_site(struct netr_DsRGetDCNameInfo *info)
1100 {
1101         if (info->dc_flags & DS_SERVER_CLOSEST) {
1102                 return true;
1103         }
1104
1105         if (!info->client_site_name) {
1106                 return true;
1107         }
1108
1109         if (!info->dc_site_name) {
1110                 return false;
1111         }
1112
1113         if (strcmp(info->client_site_name, info->dc_site_name) == 0) {
1114                 return true;
1115         }
1116
1117         return false;
1118 }
1119
1120 /********************************************************************
1121  Internal dsgetdcname.
1122 ********************************************************************/
1123
1124 static NTSTATUS dsgetdcname_internal(TALLOC_CTX *mem_ctx,
1125                      struct messaging_context *msg_ctx,
1126                      const char *domain_name,
1127                      const struct GUID *domain_guid,
1128                      const char *site_name,
1129                      uint32_t flags,
1130                      struct netr_DsRGetDCNameInfo **info)
1131 {
1132         NTSTATUS status;
1133         struct netr_DsRGetDCNameInfo *myinfo = NULL;
1134         bool first = true;
1135         struct netr_DsRGetDCNameInfo *first_info = NULL;
1136
1137         DEBUG(10,("dsgetdcname_internal: domain_name: %s, "
1138                   "domain_guid: %s, site_name: %s, flags: 0x%08x\n",
1139                   domain_name,
1140                   domain_guid ? GUID_string(mem_ctx, domain_guid) : "(null)",
1141                   site_name ? site_name : "(null)", flags));
1142
1143         *info = NULL;
1144
1145         if (!check_allowed_required_flags(flags, site_name)) {
1146                 DEBUG(0,("invalid flags specified\n"));
1147                 return NT_STATUS_INVALID_PARAMETER;
1148         }
1149
1150         if (flags & DS_FORCE_REDISCOVERY) {
1151                 goto rediscover;
1152         }
1153
1154         status = dsgetdcname_cached(mem_ctx, msg_ctx, domain_name, domain_guid,
1155                                     flags, site_name, &myinfo);
1156         if (NT_STATUS_IS_OK(status)) {
1157                 *info = myinfo;
1158                 goto done;
1159         }
1160
1161         if (flags & DS_BACKGROUND_ONLY) {
1162                 goto done;
1163         }
1164
1165  rediscover:
1166         status = dsgetdcname_rediscover(mem_ctx, msg_ctx, domain_name,
1167                                         domain_guid, flags, site_name,
1168                                         &myinfo);
1169
1170  done:
1171         if (!NT_STATUS_IS_OK(status)) {
1172                 if (!first) {
1173                         *info = first_info;
1174                         return NT_STATUS_OK;
1175                 }
1176                 return status;
1177         }
1178
1179         if (!first) {
1180                 TALLOC_FREE(first_info);
1181         } else if (!is_closest_site(myinfo)) {
1182                 first = false;
1183                 first_info = myinfo;
1184                 /* TODO: may use the next_closest_site here */
1185                 site_name = myinfo->client_site_name;
1186                 goto rediscover;
1187         }
1188
1189         *info = myinfo;
1190         return NT_STATUS_OK;
1191 }
1192
1193 /********************************************************************
1194  dsgetdcname.
1195
1196  This will be the only public function here.
1197 ********************************************************************/
1198
1199 NTSTATUS dsgetdcname(TALLOC_CTX *mem_ctx,
1200                      struct messaging_context *msg_ctx,
1201                      const char *domain_name,
1202                      const struct GUID *domain_guid,
1203                      const char *site_name,
1204                      uint32_t flags,
1205                      struct netr_DsRGetDCNameInfo **info)
1206 {
1207         NTSTATUS status;
1208         const char *query_site = NULL;
1209         char *ptr_to_free = NULL;
1210         bool retry_query_with_null = false;
1211
1212         if ((site_name == NULL) || (site_name[0] == '\0')) {
1213                 ptr_to_free = sitename_fetch(mem_ctx, domain_name);
1214                 if (ptr_to_free != NULL) {
1215                         retry_query_with_null = true;
1216                 }
1217                 query_site = ptr_to_free;
1218         } else {
1219                 query_site = site_name;
1220         }
1221
1222         status = dsgetdcname_internal(mem_ctx,
1223                                 msg_ctx,
1224                                 domain_name,
1225                                 domain_guid,
1226                                 query_site,
1227                                 flags,
1228                                 info);
1229
1230         TALLOC_FREE(ptr_to_free);
1231
1232         if (!NT_STATUS_EQUAL(status, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND)) {
1233                 return status;
1234         }
1235
1236         /* Should we try again with site_name == NULL ? */
1237         if (retry_query_with_null) {
1238                 status = dsgetdcname_internal(mem_ctx,
1239                                         msg_ctx,
1240                                         domain_name,
1241                                         domain_guid,
1242                                         NULL,
1243                                         flags,
1244                                         info);
1245         }
1246
1247         return status;
1248 }
1249
1250 NTSTATUS dsgetonedcname(TALLOC_CTX *mem_ctx,
1251                         struct messaging_context *msg_ctx,
1252                         const char *domain_name,
1253                         const char *dcname,
1254                         uint32_t flags,
1255                         struct netr_DsRGetDCNameInfo **info)
1256 {
1257         NTSTATUS status;
1258         struct sockaddr_storage *addrs;
1259         unsigned int num_addrs, i;
1260         const char *hostname = strip_hostname(dcname);
1261
1262         status = resolve_name_list(mem_ctx, hostname, 0x20,
1263                                    &addrs, &num_addrs);
1264         if (!NT_STATUS_IS_OK(status)) {
1265                 return status;
1266         }
1267
1268         for (i = 0; i < num_addrs; i++) {
1269
1270                 bool ok;
1271                 struct ip_service_name dclist;
1272
1273                 dclist.hostname = hostname;
1274                 ok = sockaddr_storage_to_samba_sockaddr(&dclist.sa, &addrs[i]);
1275                 if (!ok) {
1276                         TALLOC_FREE(addrs);
1277                         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1278                 }
1279
1280                 status = process_dc_dns(mem_ctx, domain_name, flags,
1281                                         &dclist, 1, info);
1282                 if (NT_STATUS_IS_OK(status)) {
1283                         TALLOC_FREE(addrs);
1284                         return NT_STATUS_OK;
1285                 }
1286
1287                 if (lp_disable_netbios()) {
1288                         continue;
1289                 }
1290
1291                 status = process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags,
1292                                             &dclist, 1, info);
1293                 if (NT_STATUS_IS_OK(status)) {
1294                         TALLOC_FREE(addrs);
1295                         return NT_STATUS_OK;
1296                 }
1297         }
1298
1299         TALLOC_FREE(addrs);
1300         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1301 }