source/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
  25 #define DSGETDCNAME_FMT "DSGETDCNAME/DOMAIN/%s"
  26 /* 15 minutes */
  27 #define DSGETDCNAME_CACHE_TTL   60*15
  28
  29 struct ip_service_name {
  30         struct sockaddr_storage ss;
  31         unsigned port;
  32         const char *hostname;
  33 };
  34
  35 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
  36                                               uint32_t flags,
  37                                               struct sockaddr_storage *ss,
  38                                               uint32_t nt_version,
  39                                               union nbt_cldap_netlogon *r,
  40                                               struct netr_DsRGetDCNameInfo **info);
  41
  42 /****************************************************************
  43 ****************************************************************/
  44
  45 void debug_dsdcinfo_flags(int lvl, uint32_t flags)
  46 {
  47         DEBUG(lvl,("debug_dsdcinfo_flags: 0x%08x\n\t", flags));
  48
  49         if (flags & DS_FORCE_REDISCOVERY)
  50                 DEBUGADD(lvl,("DS_FORCE_REDISCOVERY "));
  51         if (flags & 0x000000002)
  52                 DEBUGADD(lvl,("0x00000002 "));
  53         if (flags & 0x000000004)
  54                 DEBUGADD(lvl,("0x00000004 "));
  55         if (flags & 0x000000008)
  56                 DEBUGADD(lvl,("0x00000008 "));
  57         if (flags & DS_DIRECTORY_SERVICE_REQUIRED)
  58                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_REQUIRED "));
  59         if (flags & DS_DIRECTORY_SERVICE_PREFERRED)
  60                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_PREFERRED "));
  61         if (flags & DS_GC_SERVER_REQUIRED)
  62                 DEBUGADD(lvl,("DS_GC_SERVER_REQUIRED "));
  63         if (flags & DS_PDC_REQUIRED)
  64                 DEBUGADD(lvl,("DS_PDC_REQUIRED "));
  65         if (flags & DS_BACKGROUND_ONLY)
  66                 DEBUGADD(lvl,("DS_BACKGROUND_ONLY "));
  67         if (flags & DS_IP_REQUIRED)
  68                 DEBUGADD(lvl,("DS_IP_REQUIRED "));
  69         if (flags & DS_KDC_REQUIRED)
  70                 DEBUGADD(lvl,("DS_KDC_REQUIRED "));
  71         if (flags & DS_TIMESERV_REQUIRED)
  72                 DEBUGADD(lvl,("DS_TIMESERV_REQUIRED "));
  73         if (flags & DS_WRITABLE_REQUIRED)
  74                 DEBUGADD(lvl,("DS_WRITABLE_REQUIRED "));
  75         if (flags & DS_GOOD_TIMESERV_PREFERRED)
  76                 DEBUGADD(lvl,("DS_GOOD_TIMESERV_PREFERRED "));
  77         if (flags & DS_AVOID_SELF)
  78                 DEBUGADD(lvl,("DS_AVOID_SELF "));
  79         if (flags & DS_ONLY_LDAP_NEEDED)
  80                 DEBUGADD(lvl,("DS_ONLY_LDAP_NEEDED "));
  81         if (flags & DS_IS_FLAT_NAME)
  82                 DEBUGADD(lvl,("DS_IS_FLAT_NAME "));
  83         if (flags & DS_IS_DNS_NAME)
  84                 DEBUGADD(lvl,("DS_IS_DNS_NAME "));
  85         if (flags & 0x00040000)
  86                 DEBUGADD(lvl,("0x00040000 "));
  87         if (flags & 0x00080000)
  88                 DEBUGADD(lvl,("0x00080000 "));
  89         if (flags & 0x00100000)
  90                 DEBUGADD(lvl,("0x00100000 "));
  91         if (flags & 0x00200000)
  92                 DEBUGADD(lvl,("0x00200000 "));
  93         if (flags & 0x00400000)
  94                 DEBUGADD(lvl,("0x00400000 "));
  95         if (flags & 0x00800000)
  96                 DEBUGADD(lvl,("0x00800000 "));
  97         if (flags & 0x01000000)
  98                 DEBUGADD(lvl,("0x01000000 "));
  99         if (flags & 0x02000000)
 100                 DEBUGADD(lvl,("0x02000000 "));
 101         if (flags & 0x04000000)
 102                 DEBUGADD(lvl,("0x04000000 "));
 103         if (flags & 0x08000000)
 104                 DEBUGADD(lvl,("0x08000000 "));
 105         if (flags & 0x10000000)
 106                 DEBUGADD(lvl,("0x10000000 "));
 107         if (flags & 0x20000000)
 108                 DEBUGADD(lvl,("0x20000000 "));
 109         if (flags & DS_RETURN_DNS_NAME)
 110                 DEBUGADD(lvl,("DS_RETURN_DNS_NAME "));
 111         if (flags & DS_RETURN_FLAT_NAME)
 112                 DEBUGADD(lvl,("DS_RETURN_FLAT_NAME "));
 113         if (flags)
 114                 DEBUGADD(lvl,("\n"));
 115 }
 116
 117 /****************************************************************
 118 ****************************************************************/
 119
 120 static char *dsgetdcname_cache_key(TALLOC_CTX *mem_ctx, const char *domain)
 121 {
 122         if (!mem_ctx || !domain) {
 123                 return NULL;
 124         }
 125
 126         return talloc_asprintf_strupper_m(mem_ctx, DSGETDCNAME_FMT, domain);
 127 }
 128
 129 /****************************************************************
 130 ****************************************************************/
 131
 132 static NTSTATUS dsgetdcname_cache_delete(TALLOC_CTX *mem_ctx,
 133                                         const char *domain_name)
 134 {
 135         char *key;
 136
 137         if (!gencache_init()) {
 138                 return NT_STATUS_INTERNAL_DB_ERROR;
 139         }
 140
 141         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 142         if (!key) {
 143                 return NT_STATUS_NO_MEMORY;
 144         }
 145
 146         if (!gencache_del(key)) {
 147                 return NT_STATUS_UNSUCCESSFUL;
 148         }
 149
 150         return NT_STATUS_OK;
 151 }
 152
 153 /****************************************************************
 154 ****************************************************************/
 155
 156 static NTSTATUS dsgetdcname_cache_store(TALLOC_CTX *mem_ctx,
 157                                         const char *domain_name,
 158                                         const DATA_BLOB *blob)
 159 {
 160         time_t expire_time;
 161         char *key;
 162         bool ret = false;
 163
 164         if (!gencache_init()) {
 165                 return NT_STATUS_INTERNAL_DB_ERROR;
 166         }
 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         if (gencache_lock_entry(key) != 0) {
 176                 return NT_STATUS_LOCK_NOT_GRANTED;
 177         }
 178
 179         ret = gencache_set_data_blob(key, blob, expire_time);
 180
 181         gencache_unlock_entry(key);
 182
 183         return ret ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
 184 }
 185
 186 /****************************************************************
 187 ****************************************************************/
 188
 189 #define SET_STRING(x) \
 190         talloc_strdup(mem_ctx, x); \
 191         NT_STATUS_HAVE_NO_MEMORY(x);
 192
 193 static NTSTATUS map_logon29_from_cldap_reply(TALLOC_CTX *mem_ctx,
 194                                              uint32_t flags,
 195                                              struct sockaddr_storage *ss,
 196                                              uint32_t nt_version,
 197                                              union nbt_cldap_netlogon *r,
 198                                              struct nbt_cldap_netlogon_29 *p)
 199 {
 200         char addr[INET6_ADDRSTRLEN];
 201
 202         ZERO_STRUCTP(p);
 203
 204         print_sockaddr(addr, sizeof(addr), ss);
 205         p->dc_sock_addr_size = 0x10;
 206         p->dc_sock_addr.sa_family = 2;
 207         p->dc_sock_addr.pdc_ip = talloc_strdup(mem_ctx, addr);
 208
 209         switch (nt_version & 0x000000ff) {
 210                 case 0:
 211                         return NT_STATUS_INVALID_PARAMETER;
 212                 case 1:
 213                         p->pdc_name     = SET_STRING(r->logon1.pdc_name);
 214                         p->domain       = SET_STRING(r->logon1.domain_name);
 215
 216                         if (flags & DS_PDC_REQUIRED) {
 217                                 p->server_type = NBT_SERVER_WRITABLE |
 218                                                  NBT_SERVER_PDC;
 219                         }
 220                         break;
 221                 case 2:
 222                 case 3:
 223                         p->pdc_name     = SET_STRING(r->logon3.pdc_name);
 224                         p->domain       = SET_STRING(r->logon3.domain_name);
 225                         p->pdc_dns_name = SET_STRING(r->logon3.pdc_dns_name);
 226                         p->dns_domain   = SET_STRING(r->logon3.dns_domain);
 227                         p->server_type  = r->logon3.server_type;
 228                         p->forest       = SET_STRING(r->logon3.forest);
 229                         p->domain_uuid  = r->logon3.domain_uuid;
 230
 231                         break;
 232                 case 4:
 233                 case 5:
 234                 case 6:
 235                 case 7:
 236                         p->pdc_name     = SET_STRING(r->logon5.pdc_name);
 237                         p->domain       = SET_STRING(r->logon5.domain);
 238                         p->pdc_dns_name = SET_STRING(r->logon5.pdc_dns_name);
 239                         p->dns_domain   = SET_STRING(r->logon5.dns_domain);
 240                         p->server_type  = r->logon5.server_type;
 241                         p->forest       = SET_STRING(r->logon5.forest);
 242                         p->domain_uuid  = r->logon5.domain_uuid;
 243                         p->server_site  = SET_STRING(r->logon5.server_site);
 244                         p->client_site  = SET_STRING(r->logon5.client_site);
 245
 246                         break;
 247                 case 8:
 248                 case 9:
 249                 case 10:
 250                 case 11:
 251                 case 12:
 252                 case 13:
 253                 case 14:
 254                 case 15:
 255                         p->pdc_name     = SET_STRING(r->logon13.pdc_name);
 256                         p->domain       = SET_STRING(r->logon13.domain);
 257                         p->pdc_dns_name = SET_STRING(r->logon13.pdc_dns_name);
 258                         p->dns_domain   = SET_STRING(r->logon13.dns_domain);
 259                         p->server_type  = r->logon13.server_type;
 260                         p->forest       = SET_STRING(r->logon13.forest);
 261                         p->domain_uuid  = r->logon13.domain_uuid;
 262                         p->server_site  = SET_STRING(r->logon13.server_site);
 263                         p->client_site  = SET_STRING(r->logon13.client_site);
 264
 265                         break;
 266                 default:
 267                         p->pdc_name     = SET_STRING(r->logon29.pdc_name);
 268                         p->domain       = SET_STRING(r->logon29.domain);
 269                         p->pdc_dns_name = SET_STRING(r->logon29.pdc_dns_name);
 270                         p->dns_domain   = SET_STRING(r->logon29.dns_domain);
 271                         p->server_type  = r->logon29.server_type;
 272                         p->forest       = SET_STRING(r->logon29.forest);
 273                         p->domain_uuid  = r->logon29.domain_uuid;
 274                         p->server_site  = SET_STRING(r->logon29.server_site);
 275                         p->client_site  = SET_STRING(r->logon29.client_site);
 276                         p->next_closest_site = SET_STRING(r->logon29.next_closest_site);
 277
 278                         break;
 279         }
 280
 281         return NT_STATUS_OK;
 282 }
 283
 284 /****************************************************************
 285 ****************************************************************/
 286
 287 static NTSTATUS store_cldap_reply(TALLOC_CTX *mem_ctx,
 288                                   uint32_t flags,
 289                                   struct sockaddr_storage *ss,
 290                                   uint32_t nt_version,
 291                                   union nbt_cldap_netlogon *r)
 292 {
 293         DATA_BLOB blob;
 294         enum ndr_err_code ndr_err;
 295         NTSTATUS status;
 296         struct nbt_cldap_netlogon_29 logon29;
 297
 298         status = map_logon29_from_cldap_reply(mem_ctx, flags, ss,
 299                                               nt_version, r, &logon29);
 300         if (!NT_STATUS_IS_OK(status)) {
 301                 return status;
 302         }
 303
 304         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, &logon29,
 305                        (ndr_push_flags_fn_t)ndr_push_nbt_cldap_netlogon_29);
 306         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 307                 return ndr_map_error2ntstatus(ndr_err);
 308         }
 309
 310         if (logon29.domain) {
 311                 status = dsgetdcname_cache_store(mem_ctx, logon29.domain, &blob);
 312                 if (!NT_STATUS_IS_OK(status)) {
 313                         goto done;
 314                 }
 315         }
 316         if (logon29.dns_domain) {
 317                 status = dsgetdcname_cache_store(mem_ctx, logon29.dns_domain, &blob);
 318                 if (!NT_STATUS_IS_OK(status)) {
 319                         goto done;
 320                 }
 321         }
 322
 323  done:
 324         data_blob_free(&blob);
 325
 326         return status;
 327 }
 328
 329 /****************************************************************
 330 ****************************************************************/
 331
 332 static NTSTATUS dsgetdcname_cache_refresh(TALLOC_CTX *mem_ctx,
 333                                           const char *domain_name,
 334                                           struct GUID *domain_guid,
 335                                           uint32_t flags,
 336                                           const char *site_name,
 337                                           struct netr_DsRGetDCNameInfo *info)
 338 {
 339         struct netr_DsRGetDCNameInfo *dc_info;
 340
 341         return dsgetdcname(mem_ctx,
 342                            domain_name,
 343                            domain_guid,
 344                            site_name,
 345                            flags | DS_FORCE_REDISCOVERY,
 346                            &dc_info);
 347 }
 348
 349 /****************************************************************
 350 ****************************************************************/
 351
 352 static uint32_t get_cldap_reply_server_flags(union nbt_cldap_netlogon *r,
 353                                              uint32_t nt_version)
 354 {
 355         switch (nt_version & 0x000000ff) {
 356                 case 0:
 357                 case 1:
 358                         return 0;
 359                 case 2:
 360                 case 3:
 361                         return r->logon3.server_type;
 362                 case 4:
 363                 case 5:
 364                 case 6:
 365                 case 7:
 366                         return r->logon5.server_type;
 367                 case 8:
 368                 case 9:
 369                 case 10:
 370                 case 11:
 371                 case 12:
 372                 case 13:
 373                 case 14:
 374                 case 15:
 375                         return r->logon13.server_type;
 376                 default:
 377                         return r->logon29.server_type;
 378         }
 379 }
 380
 381 /****************************************************************
 382 ****************************************************************/
 383
 384 #define RETURN_ON_FALSE(x) if (!x) return false;
 385
 386 static bool check_cldap_reply_required_flags(uint32_t ret_flags,
 387                                              uint32_t req_flags)
 388 {
 389         if (ret_flags == 0) {
 390                 return true;
 391         }
 392
 393         if (req_flags & DS_PDC_REQUIRED)
 394                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_PDC);
 395
 396         if (req_flags & DS_GC_SERVER_REQUIRED)
 397                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_GC);
 398
 399         if (req_flags & DS_ONLY_LDAP_NEEDED)
 400                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_LDAP);
 401
 402         if ((req_flags & DS_DIRECTORY_SERVICE_REQUIRED) ||
 403             (req_flags & DS_DIRECTORY_SERVICE_PREFERRED))
 404                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_DS);
 405
 406         if (req_flags & DS_KDC_REQUIRED)
 407                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_KDC);
 408
 409         if (req_flags & DS_TIMESERV_REQUIRED)
 410                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_TIMESERV);
 411
 412         if (req_flags & DS_WRITABLE_REQUIRED)
 413                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_WRITABLE);
 414
 415         return true;
 416 }
 417
 418 /****************************************************************
 419 ****************************************************************/
 420
 421 static NTSTATUS dsgetdcname_cache_fetch(TALLOC_CTX *mem_ctx,
 422                                         const char *domain_name,
 423                                         struct GUID *domain_guid,
 424                                         uint32_t flags,
 425                                         const char *site_name,
 426                                         struct netr_DsRGetDCNameInfo **info_p,
 427                                         bool *expired)
 428 {
 429         char *key;
 430         DATA_BLOB blob;
 431         enum ndr_err_code ndr_err;
 432         struct netr_DsRGetDCNameInfo *info;
 433         union nbt_cldap_netlogon p;
 434         struct nbt_cldap_netlogon_29 r;
 435         NTSTATUS status;
 436
 437         if (!gencache_init()) {
 438                 return NT_STATUS_INTERNAL_DB_ERROR;
 439         }
 440
 441         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 442         if (!key) {
 443                 return NT_STATUS_NO_MEMORY;
 444         }
 445
 446         if (!gencache_get_data_blob(key, &blob, expired)) {
 447                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 448         }
 449
 450         info = TALLOC_ZERO_P(mem_ctx, struct netr_DsRGetDCNameInfo);
 451         if (!info) {
 452                 return NT_STATUS_NO_MEMORY;
 453         }
 454
 455         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &r,
 456                       (ndr_pull_flags_fn_t)ndr_pull_nbt_cldap_netlogon_29);
 457
 458         data_blob_free(&blob);
 459         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 460                 dsgetdcname_cache_delete(mem_ctx, domain_name);
 461                 return ndr_map_error2ntstatus(ndr_err);
 462         }
 463
 464         p.logon29 = r;
 465
 466         status = make_dc_info_from_cldap_reply(mem_ctx, flags, NULL,
 467                                                NETLOGON_VERSION_WITH_CLOSEST_SITE,
 468                                                &p, &info);
 469         if (!NT_STATUS_IS_OK(status)) {
 470                 return status;
 471         }
 472
 473         if (DEBUGLEVEL >= 10) {
 474                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, info);
 475         }
 476
 477         /* check flags */
 478         if (!check_cldap_reply_required_flags(info->dc_flags, flags)) {
 479                 DEBUG(10,("invalid flags\n"));
 480                 return NT_STATUS_INVALID_PARAMETER;
 481         }
 482
 483         if ((flags & DS_IP_REQUIRED) &&
 484             (info->dc_address_type != DS_ADDRESS_TYPE_INET)) {
 485                 return NT_STATUS_INVALID_PARAMETER_MIX;
 486         }
 487
 488         *info_p = info;
 489
 490         return NT_STATUS_OK;
 491 }
 492
 493 /****************************************************************
 494 ****************************************************************/
 495
 496 static NTSTATUS dsgetdcname_cached(TALLOC_CTX *mem_ctx,
 497                                    const char *domain_name,
 498                                    struct GUID *domain_guid,
 499                                    uint32_t flags,
 500                                    const char *site_name,
 501                                    struct netr_DsRGetDCNameInfo **info)
 502 {
 503         NTSTATUS status;
 504         bool expired = false;
 505
 506         status = dsgetdcname_cache_fetch(mem_ctx, domain_name, domain_guid,
 507                                          flags, site_name, info, &expired);
 508         if (!NT_STATUS_IS_OK(status)) {
 509                 DEBUG(10,("dsgetdcname_cached: cache fetch failed with: %s\n",
 510                         nt_errstr(status)));
 511                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 512         }
 513
 514         if (flags & DS_BACKGROUND_ONLY) {
 515                 return status;
 516         }
 517
 518         if (expired) {
 519                 status = dsgetdcname_cache_refresh(mem_ctx, domain_name,
 520                                                    domain_guid, flags,
 521                                                    site_name, *info);
 522                 if (!NT_STATUS_IS_OK(status)) {
 523                         return status;
 524                 }
 525         }
 526
 527         return status;
 528 }
 529
 530 /****************************************************************
 531 ****************************************************************/
 532
 533 static bool check_allowed_required_flags(uint32_t flags)
 534 {
 535         uint32_t return_type = flags & (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME);
 536         uint32_t offered_type = flags & (DS_IS_FLAT_NAME|DS_IS_DNS_NAME);
 537         uint32_t query_type = flags & (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY);
 538
 539         /* FIXME: check for DSGETDC_VALID_FLAGS and check for excluse bits
 540          * (DS_PDC_REQUIRED, DS_KDC_REQUIRED, DS_GC_SERVER_REQUIRED) */
 541
 542         debug_dsdcinfo_flags(10, flags);
 543
 544         if (return_type == (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME)) {
 545                 return false;
 546         }
 547
 548         if (offered_type == (DS_IS_DNS_NAME|DS_IS_FLAT_NAME)) {
 549                 return false;
 550         }
 551
 552         if (query_type == (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY)) {
 553                 return false;
 554         }
 555
 556 #if 0
 557         if ((flags & DS_RETURN_DNS_NAME) && (!(flags & DS_IP_REQUIRED))) {
 558                 printf("gd: here5 \n");
 559                 return false;
 560         }
 561 #endif
 562         return true;
 563 }
 564
 565 /****************************************************************
 566 ****************************************************************/
 567
 568 static NTSTATUS discover_dc_netbios(TALLOC_CTX *mem_ctx,
 569                                     const char *domain_name,
 570                                     uint32_t flags,
 571                                     struct ip_service_name **returned_dclist,
 572                                     int *returned_count)
 573 {
 574         NTSTATUS status;
 575         enum nbt_name_type name_type = NBT_NAME_LOGON;
 576         struct ip_service *iplist;
 577         int i;
 578         struct ip_service_name *dclist = NULL;
 579         int count;
 580
 581         *returned_dclist = NULL;
 582         *returned_count = 0;
 583
 584         if (lp_disable_netbios()) {
 585                 return NT_STATUS_NOT_SUPPORTED;
 586         }
 587
 588         if (flags & DS_PDC_REQUIRED) {
 589                 name_type = NBT_NAME_PDC;
 590         }
 591
 592         status = internal_resolve_name(domain_name, name_type, NULL,
 593                                        &iplist, &count,
 594                                        "lmhosts wins bcast");
 595         if (!NT_STATUS_IS_OK(status)) {
 596                 DEBUG(10,("discover_dc_netbios: failed to find DC\n"));
 597                 return status;
 598         }
 599
 600         dclist = TALLOC_ZERO_ARRAY(mem_ctx, struct ip_service_name, count);
 601         if (!dclist) {
 602                 return NT_STATUS_NO_MEMORY;
 603         }
 604
 605         for (i=0; i<count; i++) {
 606
 607                 char addr[INET6_ADDRSTRLEN];
 608                 struct ip_service_name *r = &dclist[i];
 609
 610                 print_sockaddr(addr, sizeof(addr),
 611                                &iplist[i].ss);
 612
 613                 r->ss   = iplist[i].ss;
 614                 r->port = iplist[i].port;
 615                 r->hostname = talloc_strdup(mem_ctx, addr);
 616                 if (!r->hostname) {
 617                         return NT_STATUS_NO_MEMORY;
 618                 }
 619
 620         }
 621
 622         *returned_dclist = dclist;
 623         *returned_count = count;
 624
 625         return NT_STATUS_OK;
 626 }
 627
 628 /****************************************************************
 629 ****************************************************************/
 630
 631 static NTSTATUS discover_dc_dns(TALLOC_CTX *mem_ctx,
 632                                 const char *domain_name,
 633                                 struct GUID *domain_guid,
 634                                 uint32_t flags,
 635                                 const char *site_name,
 636                                 struct ip_service_name **returned_dclist,
 637                                 int *return_count)
 638 {
 639         int i, j;
 640         NTSTATUS status;
 641         struct dns_rr_srv *dcs = NULL;
 642         int numdcs = 0;
 643         int numaddrs = 0;
 644         struct ip_service_name *dclist = NULL;
 645         int count = 0;
 646
 647         if (flags & DS_PDC_REQUIRED) {
 648                 status = ads_dns_query_pdc(mem_ctx, domain_name,
 649                                            &dcs, &numdcs);
 650         } else if (flags & DS_GC_SERVER_REQUIRED) {
 651                 status = ads_dns_query_gcs(mem_ctx, domain_name, site_name,
 652                                            &dcs, &numdcs);
 653         } else if (flags & DS_KDC_REQUIRED) {
 654                 status = ads_dns_query_kdcs(mem_ctx, domain_name, site_name,
 655                                             &dcs, &numdcs);
 656         } else if (flags & DS_DIRECTORY_SERVICE_REQUIRED) {
 657                 status = ads_dns_query_dcs(mem_ctx, domain_name, site_name,
 658                                            &dcs, &numdcs);
 659         } else if (domain_guid) {
 660                 status = ads_dns_query_dcs_guid(mem_ctx, domain_name,
 661                                                 domain_guid, &dcs, &numdcs);
 662         } else {
 663                 status = ads_dns_query_dcs(mem_ctx, domain_name, site_name,
 664                                            &dcs, &numdcs);
 665         }
 666
 667         if (!NT_STATUS_IS_OK(status)) {
 668                 return status;
 669         }
 670
 671         if (numdcs == 0) {
 672                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 673         }
 674
 675         for (i=0;i<numdcs;i++) {
 676                 numaddrs += MAX(dcs[i].num_ips,1);
 677         }
 678
 679         dclist = TALLOC_ZERO_ARRAY(mem_ctx,
 680                                    struct ip_service_name,
 681                                    numaddrs);
 682         if (!dclist) {
 683                 return NT_STATUS_NO_MEMORY;
 684         }
 685
 686         /* now unroll the list of IP addresses */
 687
 688         *return_count = 0;
 689         i = 0;
 690         j = 0;
 691
 692         while ((i < numdcs) && (count < numaddrs)) {
 693
 694                 struct ip_service_name *r = &dclist[count];
 695
 696                 r->port = dcs[count].port;
 697                 r->hostname = dcs[count].hostname;
 698
 699                 /* If we don't have an IP list for a name, lookup it up */
 700
 701                 if (!dcs[i].ss_s) {
 702                         interpret_string_addr(&r->ss, dcs[i].hostname, 0);
 703                         i++;
 704                         j = 0;
 705                 } else {
 706                         /* use the IP addresses from the SRV sresponse */
 707
 708                         if (j >= dcs[i].num_ips) {
 709                                 i++;
 710                                 j = 0;
 711                                 continue;
 712                         }
 713
 714                         r->ss = dcs[i].ss_s[j];
 715                         j++;
 716                 }
 717
 718                 /* make sure it is a valid IP.  I considered checking the
 719                  * negative connection cache, but this is the wrong place for
 720                  * it.  Maybe only as a hac.  After think about it, if all of
 721                  * the IP addresses retuend from DNS are dead, what hope does a
 722                  * netbios name lookup have?  The standard reason for falling
 723                  * back to netbios lookups is that our DNS server doesn't know
 724                  * anything about the DC's   -- jerry */
 725
 726                 if (!is_zero_addr(&r->ss)) {
 727                         count++;
 728                         continue;
 729                 }
 730         }
 731
 732         *returned_dclist = dclist;
 733         *return_count = count;
 734
 735         if (count > 0) {
 736                 return NT_STATUS_OK;
 737         }
 738
 739         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 740 }
 741
 742 /****************************************************************
 743 ****************************************************************/
 744
 745 static NTSTATUS make_domain_controller_info(TALLOC_CTX *mem_ctx,
 746                                             const char *dc_unc,
 747                                             const char *dc_address,
 748                                             uint32_t dc_address_type,
 749                                             const struct GUID *domain_guid,
 750                                             const char *domain_name,
 751                                             const char *forest_name,
 752                                             uint32_t flags,
 753                                             const char *dc_site_name,
 754                                             const char *client_site_name,
 755                                             struct netr_DsRGetDCNameInfo **info_out)
 756 {
 757         struct netr_DsRGetDCNameInfo *info;
 758
 759         info = TALLOC_ZERO_P(mem_ctx, struct netr_DsRGetDCNameInfo);
 760         NT_STATUS_HAVE_NO_MEMORY(info);
 761
 762         if (dc_unc) {
 763                 info->dc_unc = talloc_strdup(mem_ctx, dc_unc);
 764                 NT_STATUS_HAVE_NO_MEMORY(info->dc_unc);
 765         }
 766
 767         if (dc_address) {
 768                 if (!(dc_address[0] == '\\' && dc_address[1] == '\\')) {
 769                         info->dc_address = talloc_asprintf(mem_ctx, "\\\\%s",
 770                                                            dc_address);
 771                 } else {
 772                         info->dc_address = talloc_strdup(mem_ctx, dc_address);
 773                 }
 774                 NT_STATUS_HAVE_NO_MEMORY(info->dc_address);
 775         }
 776
 777         info->dc_address_type = dc_address_type;
 778
 779         if (domain_guid) {
 780                 info->domain_guid = *domain_guid;
 781         }
 782
 783         if (domain_name) {
 784                 info->domain_name = talloc_strdup(mem_ctx, domain_name);
 785                 NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
 786         }
 787
 788         if (forest_name) {
 789                 info->forest_name = talloc_strdup(mem_ctx, forest_name);
 790                 NT_STATUS_HAVE_NO_MEMORY(info->forest_name);
 791                 flags |= DS_DNS_FOREST;
 792         }
 793
 794         info->dc_flags = flags;
 795
 796         if (dc_site_name) {
 797                 info->dc_site_name = talloc_strdup(mem_ctx, dc_site_name);
 798                 NT_STATUS_HAVE_NO_MEMORY(info->dc_site_name);
 799         }
 800
 801         if (client_site_name) {
 802                 info->client_site_name = talloc_strdup(mem_ctx,
 803                                                        client_site_name);
 804                 NT_STATUS_HAVE_NO_MEMORY(info->client_site_name);
 805         }
 806
 807         *info_out = info;
 808
 809         return NT_STATUS_OK;
 810 }
 811
 812 /****************************************************************
 813 ****************************************************************/
 814
 815 static void map_dc_and_domain_names(uint32_t flags,
 816                                     const char *dc_name,
 817                                     const char *domain_name,
 818                                     const char *dns_dc_name,
 819                                     const char *dns_domain_name,
 820                                     uint32_t *dc_flags,
 821                                     const char **hostname_p,
 822                                     const char **domain_p)
 823 {
 824         switch (flags & 0xf0000000) {
 825                 case DS_RETURN_FLAT_NAME:
 826                         if (dc_name && domain_name &&
 827                             *dc_name && *domain_name) {
 828                                 *hostname_p = dc_name;
 829                                 *domain_p = domain_name;
 830                                 break;
 831                         }
 832                 case DS_RETURN_DNS_NAME:
 833                 default:
 834                         if (dns_dc_name && dns_domain_name &&
 835                             *dns_dc_name && *dns_domain_name) {
 836                                 *hostname_p = dns_dc_name;
 837                                 *domain_p = dns_domain_name;
 838                                 *dc_flags |= DS_DNS_DOMAIN | DS_DNS_CONTROLLER;
 839                                 break;
 840                         }
 841                         if (dc_name && domain_name &&
 842                             *dc_name && *domain_name) {
 843                                 *hostname_p = dc_name;
 844                                 *domain_p = domain_name;
 845                                 break;
 846                         }
 847         }
 848 }
 849
 850 /****************************************************************
 851 ****************************************************************/
 852
 853 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
 854                                               uint32_t flags,
 855                                               struct sockaddr_storage *ss,
 856                                               uint32_t nt_version,
 857                                               union nbt_cldap_netlogon *r,
 858                                               struct netr_DsRGetDCNameInfo **info)
 859 {
 860         const char *dc_hostname, *dc_domain_name;
 861         const char *dc_address = NULL;
 862         const char *dc_forest = NULL;
 863         uint32_t dc_address_type = 0;
 864         uint32_t dc_flags = 0;
 865         struct GUID *dc_domain_guid = NULL;
 866         const char *dc_server_site = NULL;
 867         const char *dc_client_site = NULL;
 868
 869         char addr[INET6_ADDRSTRLEN];
 870
 871         if (ss) {
 872                 print_sockaddr(addr, sizeof(addr), ss);
 873                 dc_address = addr;
 874                 dc_address_type = DS_ADDRESS_TYPE_INET;
 875         }
 876
 877         switch (nt_version & 0x000000ff) {
 878                 case 0:
 879                         return NT_STATUS_INVALID_PARAMETER;
 880                 case 1:
 881                         if (!ss) {
 882                                 dc_address      = r->logon1.pdc_name;
 883                                 dc_address_type = DS_ADDRESS_TYPE_NETBIOS;
 884                         }
 885
 886                         map_dc_and_domain_names(flags,
 887                                                 r->logon1.pdc_name,
 888                                                 r->logon1.domain_name,
 889                                                 NULL,
 890                                                 NULL,
 891                                                 &dc_flags,
 892                                                 &dc_hostname,
 893                                                 &dc_domain_name);
 894
 895                         if (flags & DS_PDC_REQUIRED) {
 896                                 dc_flags = NBT_SERVER_WRITABLE | NBT_SERVER_PDC;
 897                         }
 898                         break;
 899                 case 2:
 900                 case 3:
 901                         if (!ss) {
 902                                 dc_address      = r->logon3.pdc_ip;
 903                                 dc_address_type = DS_ADDRESS_TYPE_INET;
 904                         }
 905
 906                         map_dc_and_domain_names(flags,
 907                                                 r->logon3.pdc_name,
 908                                                 r->logon3.domain_name,
 909                                                 r->logon3.pdc_dns_name,
 910                                                 r->logon3.dns_domain,
 911                                                 &dc_flags,
 912                                                 &dc_hostname,
 913                                                 &dc_domain_name);
 914
 915                         dc_flags        |= r->logon3.server_type;
 916                         dc_forest       = r->logon3.forest;
 917                         dc_domain_guid  = &r->logon3.domain_uuid;
 918
 919                         break;
 920                 case 4:
 921                 case 5:
 922                 case 6:
 923                 case 7:
 924                         if (!ss) {
 925                                 dc_address      = r->logon5.pdc_name;
 926                                 dc_address_type = DS_ADDRESS_TYPE_NETBIOS;
 927                         }
 928
 929                         map_dc_and_domain_names(flags,
 930                                                 r->logon5.pdc_name,
 931                                                 r->logon5.domain,
 932                                                 r->logon5.pdc_dns_name,
 933                                                 r->logon5.dns_domain,
 934                                                 &dc_flags,
 935                                                 &dc_hostname,
 936                                                 &dc_domain_name);
 937
 938                         dc_flags        |= r->logon5.server_type;
 939                         dc_forest       = r->logon5.forest;
 940                         dc_domain_guid  = &r->logon5.domain_uuid;
 941                         dc_server_site  = r->logon5.server_site;
 942                         dc_client_site  = r->logon5.client_site;
 943
 944                         break;
 945                 case 8:
 946                 case 9:
 947                 case 10:
 948                 case 11:
 949                 case 12:
 950                 case 13:
 951                 case 14:
 952                 case 15:
 953                         if (!ss) {
 954                                 dc_address      = r->logon13.dc_sock_addr.pdc_ip;
 955                                 dc_address_type = DS_ADDRESS_TYPE_INET;
 956                         }
 957
 958                         map_dc_and_domain_names(flags,
 959                                                 r->logon13.pdc_name,
 960                                                 r->logon13.domain,
 961                                                 r->logon13.pdc_dns_name,
 962                                                 r->logon13.dns_domain,
 963                                                 &dc_flags,
 964                                                 &dc_hostname,
 965                                                 &dc_domain_name);
 966
 967                         dc_flags        |= r->logon13.server_type;
 968                         dc_forest       = r->logon13.forest;
 969                         dc_domain_guid  = &r->logon13.domain_uuid;
 970                         dc_server_site  = r->logon13.server_site;
 971                         dc_client_site  = r->logon13.client_site;
 972
 973                         break;
 974                 default:
 975                         if (!ss) {
 976                                 dc_address      = r->logon29.dc_sock_addr.pdc_ip;
 977                                 dc_address_type = DS_ADDRESS_TYPE_INET;
 978                         }
 979
 980                         map_dc_and_domain_names(flags,
 981                                                 r->logon29.pdc_name,
 982                                                 r->logon29.domain,
 983                                                 r->logon29.pdc_dns_name,
 984                                                 r->logon29.dns_domain,
 985                                                 &dc_flags,
 986                                                 &dc_hostname,
 987                                                 &dc_domain_name);
 988
 989                         dc_flags        |= r->logon29.server_type;
 990                         dc_forest       = r->logon29.forest;
 991                         dc_domain_guid  = &r->logon29.domain_uuid;
 992                         dc_server_site  = r->logon29.server_site;
 993                         dc_client_site  = r->logon29.client_site;
 994
 995                         break;
 996         }
 997
 998         return make_domain_controller_info(mem_ctx,
 999                                            dc_hostname,
1000                                            dc_address,
1001                                            dc_address_type,
1002                                            dc_domain_guid,
1003                                            dc_domain_name,
1004                                            dc_forest,
1005                                            dc_flags,
1006                                            dc_server_site,
1007                                            dc_client_site,
1008                                            info);
1009 }
1010
1011 /****************************************************************
1012 ****************************************************************/
1013
1014 static uint32_t map_ds_flags_to_nt_version(uint32_t flags)
1015 {
1016         uint32_t nt_version = 0;
1017
1018         if (flags & DS_PDC_REQUIRED) {
1019                 nt_version |= NETLOGON_VERSION_PDC;
1020         }
1021
1022         if (flags & DS_GC_SERVER_REQUIRED) {
1023                 nt_version |= NETLOGON_VERSION_GC;
1024         }
1025
1026         if (flags & DS_TRY_NEXTCLOSEST_SITE) {
1027                 nt_version |= NETLOGON_VERSION_WITH_CLOSEST_SITE;
1028         }
1029
1030         if (flags & DS_IP_REQUIRED) {
1031                 nt_version |= NETLOGON_VERSION_IP;
1032         }
1033
1034         return nt_version;
1035 }
1036
1037 /****************************************************************
1038 ****************************************************************/
1039
1040 static NTSTATUS process_dc_dns(TALLOC_CTX *mem_ctx,
1041                                const char *domain_name,
1042                                uint32_t flags,
1043                                struct ip_service_name *dclist,
1044                                int num_dcs,
1045                                struct netr_DsRGetDCNameInfo **info)
1046 {
1047         int i = 0;
1048         bool valid_dc = false;
1049         union nbt_cldap_netlogon *r = NULL;
1050         uint32_t nt_version = NETLOGON_VERSION_5 |
1051                               NETLOGON_VERSION_5EX;
1052         uint32_t ret_flags = 0;
1053         NTSTATUS status;
1054
1055         nt_version |= map_ds_flags_to_nt_version(flags);
1056
1057         for (i=0; i<num_dcs; i++) {
1058
1059                 DEBUG(10,("LDAP ping to %s\n", dclist[i].hostname));
1060
1061                 if (ads_cldap_netlogon(mem_ctx, dclist[i].hostname,
1062                                         domain_name,
1063                                         &nt_version,
1064                                         &r))
1065                 {
1066                         ret_flags = get_cldap_reply_server_flags(r, nt_version);
1067
1068                         if (check_cldap_reply_required_flags(ret_flags, flags)) {
1069                                 valid_dc = true;
1070                                 break;
1071                         }
1072                 }
1073
1074                 continue;
1075         }
1076
1077         if (!valid_dc) {
1078                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1079         }
1080
1081         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1082                                                nt_version, r, info);
1083         if (NT_STATUS_IS_OK(status)) {
1084                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1085                                          nt_version, r);
1086         }
1087
1088         return status;
1089 }
1090
1091 /****************************************************************
1092 ****************************************************************/
1093
1094 static struct event_context *ev_context(void)
1095 {
1096         static struct event_context *ctx;
1097
1098         if (!ctx && !(ctx = event_context_init(NULL))) {
1099                 smb_panic("Could not init event context");
1100         }
1101         return ctx;
1102 }
1103
1104 /****************************************************************
1105 ****************************************************************/
1106
1107 static struct messaging_context *msg_context(TALLOC_CTX *mem_ctx)
1108 {
1109         static struct messaging_context *ctx;
1110
1111         if (!ctx && !(ctx = messaging_init(mem_ctx, server_id_self(),
1112                                            ev_context()))) {
1113                 smb_panic("Could not init messaging context");
1114         }
1115         return ctx;
1116 }
1117
1118 /****************************************************************
1119 ****************************************************************/
1120
1121 static NTSTATUS process_dc_netbios(TALLOC_CTX *mem_ctx,
1122                                    const char *domain_name,
1123                                    uint32_t flags,
1124                                    struct ip_service_name *dclist,
1125                                    int num_dcs,
1126                                    struct netr_DsRGetDCNameInfo **info)
1127 {
1128         struct sockaddr_storage ss;
1129         struct ip_service ip_list;
1130         enum nbt_name_type name_type = NBT_NAME_LOGON;
1131         NTSTATUS status;
1132         int i;
1133         const char *dc_name = NULL;
1134         fstring tmp_dc_name;
1135         struct messaging_context *msg_ctx = msg_context(mem_ctx);
1136         union nbt_cldap_netlogon *r = NULL;
1137         uint32_t nt_version = NETLOGON_VERSION_1 |
1138                               NETLOGON_VERSION_5 |
1139                               NETLOGON_VERSION_5EX_WITH_IP;
1140
1141         if (flags & DS_PDC_REQUIRED) {
1142                 name_type = NBT_NAME_PDC;
1143         }
1144
1145         nt_version |= map_ds_flags_to_nt_version(flags);
1146
1147         DEBUG(10,("process_dc_netbios\n"));
1148
1149         for (i=0; i<num_dcs; i++) {
1150
1151                 ip_list.ss = dclist[i].ss;
1152                 ip_list.port = 0;
1153
1154                 if (!interpret_string_addr(&ss, dclist[i].hostname, AI_NUMERICHOST)) {
1155                         return NT_STATUS_UNSUCCESSFUL;
1156                 }
1157
1158                 if (send_getdc_request(mem_ctx, msg_ctx,
1159                                        &dclist[i].ss, domain_name,
1160                                        NULL, nt_version))
1161                 {
1162                         int k;
1163                         smb_msleep(300);
1164                         for (k=0; k<5; k++) {
1165                                 if (receive_getdc_response(mem_ctx,
1166                                                            &dclist[i].ss,
1167                                                            domain_name,
1168                                                            &nt_version,
1169                                                            &dc_name,
1170                                                            &r)) {
1171                                         namecache_store(dc_name, NBT_NAME_SERVER, 1, &ip_list);
1172                                         goto make_reply;
1173                                 }
1174                                 smb_msleep(1500);
1175                         }
1176                 }
1177
1178                 if (name_status_find(domain_name,
1179                                      name_type,
1180                                      NBT_NAME_SERVER,
1181                                      &dclist[i].ss,
1182                                      tmp_dc_name))
1183                 {
1184                         struct nbt_cldap_netlogon_1 logon1;
1185
1186                         r = TALLOC_ZERO_P(mem_ctx, union nbt_cldap_netlogon);
1187                         NT_STATUS_HAVE_NO_MEMORY(r);
1188
1189                         ZERO_STRUCT(logon1);
1190
1191                         nt_version = NETLOGON_VERSION_1;
1192
1193                         logon1.nt_version = nt_version;
1194                         logon1.pdc_name = tmp_dc_name;
1195                         logon1.domain_name = talloc_strdup_upper(mem_ctx, domain_name);
1196                         NT_STATUS_HAVE_NO_MEMORY(logon1.domain_name);
1197
1198                         r->logon1 = logon1;
1199
1200                         namecache_store(tmp_dc_name, NBT_NAME_SERVER, 1, &ip_list);
1201
1202                         goto make_reply;
1203                 }
1204         }
1205
1206         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1207
1208  make_reply:
1209
1210         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1211                                                nt_version, r, info);
1212         if (NT_STATUS_IS_OK(status)) {
1213                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1214                                          nt_version, r);
1215         }
1216
1217         return status;
1218 }
1219
1220 /****************************************************************
1221 ****************************************************************/
1222
1223 static NTSTATUS dsgetdcname_rediscover(TALLOC_CTX *mem_ctx,
1224                                        const char *domain_name,
1225                                        struct GUID *domain_guid,
1226                                        uint32_t flags,
1227                                        const char *site_name,
1228                                        struct netr_DsRGetDCNameInfo **info)
1229 {
1230         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1231         struct ip_service_name *dclist = NULL;
1232         int num_dcs;
1233
1234         DEBUG(10,("dsgetdcname_rediscover\n"));
1235
1236         if (flags & DS_IS_FLAT_NAME) {
1237
1238                 status = discover_dc_netbios(mem_ctx, domain_name, flags,
1239                                              &dclist, &num_dcs);
1240                 NT_STATUS_NOT_OK_RETURN(status);
1241
1242                 return process_dc_netbios(mem_ctx, domain_name, flags,
1243                                           dclist, num_dcs, info);
1244         }
1245
1246         if (flags & DS_IS_DNS_NAME) {
1247
1248                 status = discover_dc_dns(mem_ctx, domain_name, domain_guid,
1249                                          flags, site_name, &dclist, &num_dcs);
1250                 NT_STATUS_NOT_OK_RETURN(status);
1251
1252                 return process_dc_dns(mem_ctx, domain_name, flags,
1253                                       dclist, num_dcs, info);
1254         }
1255
1256         status = discover_dc_dns(mem_ctx, domain_name, domain_guid, flags,
1257                                  site_name, &dclist, &num_dcs);
1258
1259         if (NT_STATUS_IS_OK(status) && num_dcs != 0) {
1260
1261                 status = process_dc_dns(mem_ctx, domain_name, flags, dclist,
1262                                         num_dcs, info);
1263                 if (NT_STATUS_IS_OK(status)) {
1264                         return status;
1265                 }
1266         }
1267
1268         status = discover_dc_netbios(mem_ctx, domain_name, flags, &dclist,
1269                                      &num_dcs);
1270         NT_STATUS_NOT_OK_RETURN(status);
1271
1272         return process_dc_netbios(mem_ctx, domain_name, flags, dclist,
1273                                   num_dcs, info);
1274 }
1275
1276 /********************************************************************
1277  dsgetdcname.
1278
1279  This will be the only public function here.
1280 ********************************************************************/
1281
1282 NTSTATUS dsgetdcname(TALLOC_CTX *mem_ctx,
1283                      const char *domain_name,
1284                      struct GUID *domain_guid,
1285                      const char *site_name,
1286                      uint32_t flags,
1287                      struct netr_DsRGetDCNameInfo **info)
1288 {
1289         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1290         struct netr_DsRGetDCNameInfo *myinfo = NULL;
1291
1292         DEBUG(10,("dsgetdcname: domain_name: %s, "
1293                   "domain_guid: %s, site_name: %s, flags: 0x%08x\n",
1294                   domain_name,
1295                   domain_guid ? GUID_string(mem_ctx, domain_guid) : "(null)",
1296                   site_name, flags));
1297
1298         *info = NULL;
1299
1300         if (!check_allowed_required_flags(flags)) {
1301                 DEBUG(0,("invalid flags specified\n"));
1302                 return NT_STATUS_INVALID_PARAMETER;
1303         }
1304
1305         if (flags & DS_FORCE_REDISCOVERY) {
1306                 goto rediscover;
1307         }
1308
1309         status = dsgetdcname_cached(mem_ctx, domain_name, domain_guid,
1310                                     flags, site_name, &myinfo);
1311         if (NT_STATUS_IS_OK(status)) {
1312                 *info = myinfo;
1313                 return status;
1314         }
1315
1316         if (flags & DS_BACKGROUND_ONLY) {
1317                 return status;
1318         }
1319
1320  rediscover:
1321         status = dsgetdcname_rediscover(mem_ctx, domain_name,
1322                                         domain_guid, flags, site_name,
1323                                         &myinfo);
1324
1325         if (NT_STATUS_IS_OK(status)) {
1326                 *info = myinfo;
1327         }
1328
1329         return status;
1330 }