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
   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 /****************************************************************
  36 ****************************************************************/
  37
  38 void debug_dsdcinfo_flags(int lvl, uint32_t flags)
  39 {
  40         DEBUG(lvl,("debug_dsdcinfo_flags: 0x%08x\n\t", flags));
  41
  42         if (flags & DS_FORCE_REDISCOVERY)
  43                 DEBUGADD(lvl,("DS_FORCE_REDISCOVERY "));
  44         if (flags & 0x000000002)
  45                 DEBUGADD(lvl,("0x00000002 "));
  46         if (flags & 0x000000004)
  47                 DEBUGADD(lvl,("0x00000004 "));
  48         if (flags & 0x000000008)
  49                 DEBUGADD(lvl,("0x00000008 "));
  50         if (flags & DS_DIRECTORY_SERVICE_REQUIRED)
  51                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_REQUIRED "));
  52         if (flags & DS_DIRECTORY_SERVICE_PREFERRED)
  53                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_PREFERRED "));
  54         if (flags & DS_GC_SERVER_REQUIRED)
  55                 DEBUGADD(lvl,("DS_GC_SERVER_REQUIRED "));
  56         if (flags & DS_PDC_REQUIRED)
  57                 DEBUGADD(lvl,("DS_PDC_REQUIRED "));
  58         if (flags & DS_BACKGROUND_ONLY)
  59                 DEBUGADD(lvl,("DS_BACKGROUND_ONLY "));
  60         if (flags & DS_IP_REQUIRED)
  61                 DEBUGADD(lvl,("DS_IP_REQUIRED "));
  62         if (flags & DS_KDC_REQUIRED)
  63                 DEBUGADD(lvl,("DS_KDC_REQUIRED "));
  64         if (flags & DS_TIMESERV_REQUIRED)
  65                 DEBUGADD(lvl,("DS_TIMESERV_REQUIRED "));
  66         if (flags & DS_WRITABLE_REQUIRED)
  67                 DEBUGADD(lvl,("DS_WRITABLE_REQUIRED "));
  68         if (flags & DS_GOOD_TIMESERV_PREFERRED)
  69                 DEBUGADD(lvl,("DS_GOOD_TIMESERV_PREFERRED "));
  70         if (flags & DS_AVOID_SELF)
  71                 DEBUGADD(lvl,("DS_AVOID_SELF "));
  72         if (flags & DS_ONLY_LDAP_NEEDED)
  73                 DEBUGADD(lvl,("DS_ONLY_LDAP_NEEDED "));
  74         if (flags & DS_IS_FLAT_NAME)
  75                 DEBUGADD(lvl,("DS_IS_FLAT_NAME "));
  76         if (flags & DS_IS_DNS_NAME)
  77                 DEBUGADD(lvl,("DS_IS_DNS_NAME "));
  78         if (flags & 0x00040000)
  79                 DEBUGADD(lvl,("0x00040000 "));
  80         if (flags & 0x00080000)
  81                 DEBUGADD(lvl,("0x00080000 "));
  82         if (flags & 0x00100000)
  83                 DEBUGADD(lvl,("0x00100000 "));
  84         if (flags & 0x00200000)
  85                 DEBUGADD(lvl,("0x00200000 "));
  86         if (flags & 0x00400000)
  87                 DEBUGADD(lvl,("0x00400000 "));
  88         if (flags & 0x00800000)
  89                 DEBUGADD(lvl,("0x00800000 "));
  90         if (flags & 0x01000000)
  91                 DEBUGADD(lvl,("0x01000000 "));
  92         if (flags & 0x02000000)
  93                 DEBUGADD(lvl,("0x02000000 "));
  94         if (flags & 0x04000000)
  95                 DEBUGADD(lvl,("0x04000000 "));
  96         if (flags & 0x08000000)
  97                 DEBUGADD(lvl,("0x08000000 "));
  98         if (flags & 0x10000000)
  99                 DEBUGADD(lvl,("0x10000000 "));
 100         if (flags & 0x20000000)
 101                 DEBUGADD(lvl,("0x20000000 "));
 102         if (flags & DS_RETURN_DNS_NAME)
 103                 DEBUGADD(lvl,("DS_RETURN_DNS_NAME "));
 104         if (flags & DS_RETURN_FLAT_NAME)
 105                 DEBUGADD(lvl,("DS_RETURN_FLAT_NAME "));
 106         if (flags)
 107                 DEBUGADD(lvl,("\n"));
 108 }
 109
 110 /*********************************************************************
 111  ********************************************************************/
 112
 113 static int pack_dsdcinfo(struct DS_DOMAIN_CONTROLLER_INFO *info,
 114                          unsigned char **buf)
 115 {
 116         unsigned char *buffer = NULL;
 117         int len = 0;
 118         int buflen = 0;
 119         UUID_FLAT guid_flat;
 120
 121         DEBUG(10,("pack_dsdcinfo: Packing dsdcinfo\n"));
 122
 123         ZERO_STRUCT(guid_flat);
 124
 125         if (info->domain_guid) {
 126                 const struct GUID *guid = info->domain_guid;
 127                 smb_uuid_pack(*guid, &guid_flat);
 128         }
 129
 130  again:
 131         len = 0;
 132
 133         if (buflen > 0) {
 134                 DEBUG(10,("pack_dsdcinfo: Packing domain %s (%s)\n",
 135                           info->domain_name, info->domain_controller_name));
 136         }
 137
 138         len += tdb_pack(buffer+len, buflen-len, "ffdBffdff",
 139                         info->domain_controller_name,
 140                         info->domain_controller_address,
 141                         info->domain_controller_address_type,
 142                         UUID_FLAT_SIZE, guid_flat.info,
 143                         info->domain_name,
 144                         info->dns_forest_name,
 145                         info->flags,
 146                         info->dc_site_name,
 147                         info->client_site_name);
 148
 149         if (buflen < len) {
 150                 SAFE_FREE(buffer);
 151                 if ((buffer = SMB_MALLOC_ARRAY(unsigned char, len)) == NULL ) {
 152                         DEBUG(0,("pack_dsdcinfo: failed to alloc buffer!\n"));
 153                         buflen = -1;
 154                         goto done;
 155                 }
 156                 buflen = len;
 157                 goto again;
 158         }
 159
 160         *buf = buffer;
 161
 162  done:
 163         return buflen;
 164 }
 165
 166 /*********************************************************************
 167  ********************************************************************/
 168
 169 static NTSTATUS unpack_dsdcinfo(TALLOC_CTX *mem_ctx,
 170                                 unsigned char *buf,
 171                                 int buflen,
 172                                 struct DS_DOMAIN_CONTROLLER_INFO **info_ret)
 173 {
 174         int len = 0;
 175         struct DS_DOMAIN_CONTROLLER_INFO *info = NULL;
 176         uint32_t guid_len = 0;
 177         unsigned char *guid_buf = NULL;
 178         UUID_FLAT guid_flat;
 179
 180         /* forgive me 6 times */
 181         fstring domain_controller_name;
 182         fstring domain_controller_address;
 183         fstring domain_name;
 184         fstring dns_forest_name;
 185         fstring dc_site_name;
 186         fstring client_site_name;
 187
 188         info = TALLOC_ZERO_P(mem_ctx, struct DS_DOMAIN_CONTROLLER_INFO);
 189         NT_STATUS_HAVE_NO_MEMORY(info);
 190
 191         len += tdb_unpack(buf+len, buflen-len, "ffdBffdff",
 192                           &domain_controller_name,
 193                           &domain_controller_address,
 194                           &info->domain_controller_address_type,
 195                           &guid_len, &guid_buf,
 196                           &domain_name,
 197                           &dns_forest_name,
 198                           &info->flags,
 199                           &dc_site_name,
 200                           &client_site_name);
 201         if (len == -1) {
 202                 DEBUG(5,("unpack_dsdcinfo: Failed to unpack domain\n"));
 203                 goto failed;
 204         }
 205
 206         info->domain_controller_name =
 207                 talloc_strdup(mem_ctx, domain_controller_name);
 208         info->domain_controller_address =
 209                 talloc_strdup(mem_ctx, domain_controller_address);
 210         info->domain_name =
 211                 talloc_strdup(mem_ctx, domain_name);
 212         info->dns_forest_name =
 213                 talloc_strdup(mem_ctx, dns_forest_name);
 214         info->dc_site_name =
 215                 talloc_strdup(mem_ctx, dc_site_name);
 216         info->client_site_name =
 217                 talloc_strdup(mem_ctx, client_site_name);
 218
 219         if (!info->domain_controller_name ||
 220             !info->domain_controller_address ||
 221             !info->domain_name ||
 222             !info->dns_forest_name ||
 223             !info->dc_site_name ||
 224             !info->client_site_name) {
 225                 goto failed;
 226         }
 227
 228         if (guid_len > 0) {
 229                 struct GUID guid;
 230
 231                 if (guid_len != UUID_FLAT_SIZE) {
 232                         goto failed;
 233                 }
 234
 235                 memcpy(&guid_flat.info, guid_buf, guid_len);
 236                 smb_uuid_unpack(guid_flat, &guid);
 237
 238                 info->domain_guid = (struct GUID *)talloc_memdup(
 239                         mem_ctx, &guid, sizeof(guid));
 240                 if (!info->domain_guid) {
 241                         goto failed;
 242                 }
 243                 SAFE_FREE(guid_buf);
 244         }
 245
 246         DEBUG(10,("unpack_dcscinfo: Unpacked domain %s (%s)\n",
 247                   info->domain_name, info->domain_controller_name));
 248
 249         *info_ret = info;
 250
 251         return NT_STATUS_OK;
 252
 253  failed:
 254         TALLOC_FREE(info);
 255         SAFE_FREE(guid_buf);
 256         return NT_STATUS_NO_MEMORY;
 257 }
 258
 259 /****************************************************************
 260 ****************************************************************/
 261
 262 static char *DsGetDcName_cache_key(TALLOC_CTX *mem_ctx, const char *domain)
 263 {
 264         if (!mem_ctx || !domain) {
 265                 return NULL;
 266         }
 267
 268         return talloc_asprintf_strupper_m(mem_ctx, DSGETDCNAME_FMT, domain);
 269 }
 270
 271 /****************************************************************
 272 ****************************************************************/
 273
 274 static NTSTATUS DsGetDcName_cache_delete(TALLOC_CTX *mem_ctx,
 275                                         const char *domain_name)
 276 {
 277         char *key;
 278
 279         if (!gencache_init()) {
 280                 return NT_STATUS_INTERNAL_DB_ERROR;
 281         }
 282
 283         key = DsGetDcName_cache_key(mem_ctx, domain_name);
 284         if (!key) {
 285                 return NT_STATUS_NO_MEMORY;
 286         }
 287
 288         if (!gencache_del(key)) {
 289                 return NT_STATUS_UNSUCCESSFUL;
 290         }
 291
 292         return NT_STATUS_OK;
 293 }
 294
 295 /****************************************************************
 296 ****************************************************************/
 297
 298 static NTSTATUS DsGetDcName_cache_store(TALLOC_CTX *mem_ctx,
 299                                         const char *domain_name,
 300                                         struct DS_DOMAIN_CONTROLLER_INFO *info)
 301 {
 302         time_t expire_time;
 303         char *key;
 304         bool ret = False;
 305         DATA_BLOB blob;
 306         unsigned char *buf = NULL;
 307         int len = 0;
 308
 309         if (!gencache_init()) {
 310                 return NT_STATUS_INTERNAL_DB_ERROR;
 311         }
 312
 313         key = DsGetDcName_cache_key(mem_ctx, domain_name);
 314         if (!key) {
 315                 return NT_STATUS_NO_MEMORY;
 316         }
 317
 318         expire_time = time(NULL) + DSGETDCNAME_CACHE_TTL;
 319
 320         len = pack_dsdcinfo(info, &buf);
 321         if (len == -1) {
 322                 return NT_STATUS_UNSUCCESSFUL;
 323         }
 324
 325         blob = data_blob(buf, len);
 326         SAFE_FREE(buf);
 327
 328         if (gencache_lock_entry(key) != 0) {
 329                 data_blob_free(&blob);
 330                 return NT_STATUS_LOCK_NOT_GRANTED;
 331         }
 332
 333         ret = gencache_set_data_blob(key, &blob, expire_time);
 334         data_blob_free(&blob);
 335
 336         gencache_unlock_entry(key);
 337
 338         return ret ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
 339 }
 340
 341 /****************************************************************
 342 ****************************************************************/
 343
 344 static NTSTATUS DsGetDcName_cache_refresh(TALLOC_CTX *mem_ctx,
 345                                           const char *domain_name,
 346                                           struct GUID *domain_guid,
 347                                           uint32_t flags,
 348                                           const char *site_name,
 349                                           struct DS_DOMAIN_CONTROLLER_INFO *info)
 350 {
 351         struct cldap_netlogon_reply r;
 352
 353         /* check if matching entry is older then 15 minutes, if yes, send
 354          * CLDAP/MAILSLOT ping again and store the cached data */
 355
 356         ZERO_STRUCT(r);
 357
 358         if (ads_cldap_netlogon(info->domain_controller_name,
 359                                info->domain_name, &r)) {
 360
 361                 DsGetDcName_cache_delete(mem_ctx, domain_name);
 362
 363                 return DsGetDcName_cache_store(mem_ctx,
 364                                                info->domain_name,
 365                                                info);
 366         }
 367
 368         return NT_STATUS_INVALID_NETWORK_RESPONSE;
 369 }
 370
 371 /****************************************************************
 372 ****************************************************************/
 373
 374 #define RETURN_ON_FALSE(x) if (!x) return False;
 375
 376 static bool check_cldap_reply_required_flags(uint32_t ret_flags,
 377                                              uint32_t req_flags)
 378 {
 379         if (req_flags & DS_PDC_REQUIRED)
 380                 RETURN_ON_FALSE(ret_flags & ADS_PDC);
 381
 382         if (req_flags & DS_GC_SERVER_REQUIRED)
 383                 RETURN_ON_FALSE(ret_flags & ADS_GC);
 384
 385         if (req_flags & DS_ONLY_LDAP_NEEDED)
 386                 RETURN_ON_FALSE(ret_flags & ADS_LDAP);
 387
 388         if ((req_flags & DS_DIRECTORY_SERVICE_REQUIRED) ||
 389             (req_flags & DS_DIRECTORY_SERVICE_PREFERRED))
 390                 RETURN_ON_FALSE(ret_flags & ADS_DS);
 391
 392         if (req_flags & DS_KDC_REQUIRED)
 393                 RETURN_ON_FALSE(ret_flags & ADS_KDC);
 394
 395         if (req_flags & DS_TIMESERV_REQUIRED)
 396                 RETURN_ON_FALSE(ret_flags & ADS_TIMESERV);
 397
 398         if (req_flags & DS_WRITABLE_REQUIRED)
 399                 RETURN_ON_FALSE(ret_flags & ADS_WRITABLE);
 400
 401         return True;
 402 }
 403
 404 /****************************************************************
 405 ****************************************************************/
 406
 407 static NTSTATUS DsGetDcName_cache_fetch(TALLOC_CTX *mem_ctx,
 408                                         const char *domain_name,
 409                                         struct GUID *domain_guid,
 410                                         uint32_t flags,
 411                                         const char *site_name,
 412                                         struct DS_DOMAIN_CONTROLLER_INFO **info,
 413                                         bool *expired)
 414 {
 415         char *key;
 416         DATA_BLOB blob;
 417         NTSTATUS status;
 418
 419         if (!gencache_init()) {
 420                 return NT_STATUS_INTERNAL_DB_ERROR;
 421         }
 422
 423         key = DsGetDcName_cache_key(mem_ctx, domain_name);
 424         if (!key) {
 425                 return NT_STATUS_NO_MEMORY;
 426         }
 427
 428         if (!gencache_get_data_blob(key, &blob, expired)) {
 429                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 430         }
 431
 432         status = unpack_dsdcinfo(mem_ctx, blob.data, blob.length, info);
 433         if (!NT_STATUS_IS_OK(status)) {
 434                 data_blob_free(&blob);
 435                 return status;
 436         }
 437
 438         data_blob_free(&blob);
 439
 440         /* check flags */
 441         if (!check_cldap_reply_required_flags((*info)->flags, flags)) {
 442                 DEBUG(10,("invalid flags\n"));
 443                 return NT_STATUS_INVALID_PARAMETER;
 444         }
 445
 446         if ((flags & DS_IP_REQUIRED) &&
 447             ((*info)->domain_controller_address_type != ADS_INET_ADDRESS)) {
 448                 return NT_STATUS_INVALID_PARAMETER_MIX;
 449         }
 450
 451         return NT_STATUS_OK;
 452 }
 453
 454 /****************************************************************
 455 ****************************************************************/
 456
 457 static NTSTATUS DsGetDcName_cached(TALLOC_CTX *mem_ctx,
 458                                    const char *domain_name,
 459                                    struct GUID *domain_guid,
 460                                    uint32_t flags,
 461                                    const char *site_name,
 462                                    struct DS_DOMAIN_CONTROLLER_INFO **info)
 463 {
 464         NTSTATUS status;
 465         bool expired = False;
 466
 467         status = DsGetDcName_cache_fetch(mem_ctx, domain_name, domain_guid,
 468                                          flags, site_name, info, &expired);
 469         if (!NT_STATUS_IS_OK(status)) {
 470                 DEBUG(10,("DsGetDcName_cached: cache fetch failed with: %s\n",
 471                         nt_errstr(status)));
 472                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 473         }
 474
 475         if (flags & DS_BACKGROUND_ONLY) {
 476                 return status;
 477         }
 478
 479         if (expired) {
 480                 status = DsGetDcName_cache_refresh(mem_ctx, domain_name,
 481                                                    domain_guid, flags,
 482                                                    site_name, *info);
 483                 if (!NT_STATUS_IS_OK(status)) {
 484                         return status;
 485                 }
 486         }
 487
 488         return status;
 489 }
 490
 491 /****************************************************************
 492 ****************************************************************/
 493
 494 static bool check_allowed_required_flags(uint32_t flags)
 495 {
 496         uint32_t return_type = flags & (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME);
 497         uint32_t offered_type = flags & (DS_IS_FLAT_NAME|DS_IS_DNS_NAME);
 498         uint32_t query_type = flags & (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY);
 499
 500         /* FIXME: check for DSGETDC_VALID_FLAGS and check for excluse bits
 501          * (DS_PDC_REQUIRED, DS_KDC_REQUIRED, DS_GC_SERVER_REQUIRED) */
 502
 503         debug_dsdcinfo_flags(10, flags);
 504
 505         if (return_type == (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME)) {
 506                 return False;
 507         }
 508
 509         if (offered_type == (DS_IS_DNS_NAME|DS_IS_FLAT_NAME)) {
 510                 return False;
 511         }
 512
 513         if (query_type == (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY)) {
 514                 return False;
 515         }
 516
 517 #if 0
 518         if ((flags & DS_RETURN_DNS_NAME) && (!(flags & DS_IP_REQUIRED))) {
 519                 printf("gd: here5 \n");
 520                 return False;
 521         }
 522 #endif
 523         return True;
 524 }
 525
 526 /****************************************************************
 527 ****************************************************************/
 528
 529 static NTSTATUS discover_dc_netbios(TALLOC_CTX *mem_ctx,
 530                                     const char *domain_name,
 531                                     uint32_t flags,
 532                                     struct ip_service_name **returned_dclist,
 533                                     int *return_count)
 534 {
 535         if (lp_disable_netbios()) {
 536                 return NT_STATUS_NOT_SUPPORTED;
 537         }
 538
 539         /* FIXME: code here */
 540
 541         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 542 }
 543
 544 /****************************************************************
 545 ****************************************************************/
 546
 547 static NTSTATUS discover_dc_dns(TALLOC_CTX *mem_ctx,
 548                                 const char *domain_name,
 549                                 struct GUID *domain_guid,
 550                                 uint32_t flags,
 551                                 const char *site_name,
 552                                 struct ip_service_name **returned_dclist,
 553                                 int *return_count)
 554 {
 555         int i, j;
 556         NTSTATUS status;
 557         struct dns_rr_srv *dcs = NULL;
 558         int numdcs = 0;
 559         int numaddrs = 0;
 560
 561         if ((!(flags & DS_DIRECTORY_SERVICE_REQUIRED)) &&
 562             (!(flags & DS_KDC_REQUIRED)) &&
 563             (!(flags & DS_GC_SERVER_REQUIRED)) &&
 564             (!(flags & DS_PDC_REQUIRED))) {
 565                 DEBUG(1,("discover_dc_dns: invalid flags\n"));
 566                 return NT_STATUS_INVALID_PARAMETER;
 567         }
 568
 569         if (flags & DS_PDC_REQUIRED) {
 570                 status = ads_dns_query_pdc(mem_ctx, domain_name,
 571                                            &dcs, &numdcs);
 572         } else if (flags & DS_GC_SERVER_REQUIRED) {
 573                 status = ads_dns_query_gcs(mem_ctx, domain_name, site_name,
 574                                            &dcs, &numdcs);
 575         } else if (flags & DS_KDC_REQUIRED) {
 576                 status = ads_dns_query_kdcs(mem_ctx, domain_name, site_name,
 577                                             &dcs, &numdcs);
 578         } else if (flags & DS_DIRECTORY_SERVICE_REQUIRED) {
 579                 status = ads_dns_query_dcs(mem_ctx, domain_name, site_name,
 580                                            &dcs, &numdcs);
 581         } else if (domain_guid) {
 582                 status = ads_dns_query_dcs_guid(mem_ctx, domain_name,
 583                                                 domain_guid, &dcs, &numdcs);
 584         } else {
 585                 /* FIXME: ? */
 586                 DEBUG(1,("discover_dc_dns: not enough input\n"));
 587                 status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 588         }
 589
 590         if (!NT_STATUS_IS_OK(status)) {
 591                 return status;
 592         }
 593
 594         if (numdcs == 0) {
 595                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 596         }
 597
 598         for (i=0;i<numdcs;i++) {
 599                 numaddrs += MAX(dcs[i].num_ips,1);
 600         }
 601
 602         if ((*returned_dclist = TALLOC_ZERO_ARRAY(mem_ctx,
 603                                                   struct ip_service_name,
 604                                                   numaddrs)) == NULL) {
 605                 return NT_STATUS_NO_MEMORY;
 606         }
 607
 608         /* now unroll the list of IP addresses */
 609
 610         *return_count = 0;
 611         i = 0;
 612         j = 0;
 613         while (i < numdcs && (*return_count<numaddrs)) {
 614
 615                 struct ip_service_name *r = &(*returned_dclist)[*return_count];
 616
 617                 r->port = dcs[i].port;
 618                 r->hostname = dcs[i].hostname;
 619
 620                 if (!(flags & DS_IP_REQUIRED)) {
 621                         (*return_count)++;
 622                         continue;
 623                 }
 624
 625                 /* If we don't have an IP list for a name, lookup it up */
 626
 627                 if (!dcs[i].ss_s) {
 628                         interpret_string_addr(&r->ss, dcs[i].hostname, 0);
 629                         i++;
 630                         j = 0;
 631                 } else {
 632                         /* use the IP addresses from the SRV sresponse */
 633
 634                         if (j >= dcs[i].num_ips) {
 635                                 i++;
 636                                 j = 0;
 637                                 continue;
 638                         }
 639
 640                         r->ss = dcs[i].ss_s[j];
 641                         j++;
 642                 }
 643
 644                 /* make sure it is a valid IP.  I considered checking the
 645                  * negative connection cache, but this is the wrong place for
 646                  * it.  Maybe only as a hac.  After think about it, if all of
 647                  * the IP addresses retuend from DNS are dead, what hope does a
 648                  * netbios name lookup have?  The standard reason for falling
 649                  * back to netbios lookups is that our DNS server doesn't know
 650                  * anything about the DC's   -- jerry */
 651
 652                 if (!is_zero_addr(&r->ss)) {
 653                         (*return_count)++;
 654                         continue;
 655                 }
 656         }
 657
 658         return (*return_count > 0) ? NT_STATUS_OK :
 659                                      NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 660 }
 661
 662 /****************************************************************
 663 ****************************************************************/
 664
 665 static NTSTATUS make_domain_controller_info(TALLOC_CTX *mem_ctx,
 666                                             const char *domain_controller_name,
 667                                             const char *domain_controller_address,
 668                                             uint32_t domain_controller_address_type,
 669                                             const struct GUID *domain_guid,
 670                                             const char *domain_name,
 671                                             const char *dns_forest_name,
 672                                             uint32_t flags,
 673                                             const char *dc_site_name,
 674                                             const char *client_site_name,
 675                                             struct DS_DOMAIN_CONTROLLER_INFO **info_out)
 676 {
 677         struct DS_DOMAIN_CONTROLLER_INFO *info;
 678
 679         info = TALLOC_ZERO_P(mem_ctx, struct DS_DOMAIN_CONTROLLER_INFO);
 680         NT_STATUS_HAVE_NO_MEMORY(info);
 681
 682         if (domain_controller_name) {
 683                 info->domain_controller_name = talloc_strdup(mem_ctx,
 684                         domain_controller_name);
 685                 NT_STATUS_HAVE_NO_MEMORY(info->domain_controller_name);
 686         }
 687
 688         if (domain_controller_address) {
 689                 info->domain_controller_address = talloc_strdup(mem_ctx,
 690                         domain_controller_address);
 691                 NT_STATUS_HAVE_NO_MEMORY(info->domain_controller_address);
 692         }
 693
 694         info->domain_controller_address_type = domain_controller_address_type;
 695
 696         if (domain_guid) {
 697                 info->domain_guid = (struct GUID *)talloc_memdup(
 698                         mem_ctx, domain_guid, sizeof(*domain_guid));
 699                 NT_STATUS_HAVE_NO_MEMORY(info->domain_guid);
 700         }
 701
 702         if (domain_name) {
 703                 info->domain_name = talloc_strdup(mem_ctx, domain_name);
 704                 NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
 705         }
 706
 707         if (dns_forest_name) {
 708                 info->dns_forest_name = talloc_strdup(mem_ctx,
 709                                                       dns_forest_name);
 710                 NT_STATUS_HAVE_NO_MEMORY(info->dns_forest_name);
 711         }
 712
 713         info->flags = flags;
 714
 715         if (dc_site_name) {
 716                 info->dc_site_name = talloc_strdup(mem_ctx, dc_site_name);
 717                 NT_STATUS_HAVE_NO_MEMORY(info->dc_site_name);
 718         }
 719
 720         if (client_site_name) {
 721                 info->client_site_name = talloc_strdup(mem_ctx,
 722                                                        client_site_name);
 723                 NT_STATUS_HAVE_NO_MEMORY(info->client_site_name);
 724         }
 725
 726         *info_out = info;
 727
 728         return NT_STATUS_OK;
 729 }
 730
 731 /****************************************************************
 732 ****************************************************************/
 733
 734 static NTSTATUS process_dc_dns(TALLOC_CTX *mem_ctx,
 735                                const char *domain_name,
 736                                uint32_t flags,
 737                                struct ip_service_name **dclist,
 738                                int num_dcs,
 739                                struct DS_DOMAIN_CONTROLLER_INFO **info)
 740 {
 741         int i = 0;
 742         bool valid_dc = False;
 743         struct cldap_netlogon_reply r;
 744         const char *dc_hostname, *dc_domain_name;
 745         const char *dc_address;
 746         uint32_t dc_address_type;
 747         uint32_t dc_flags;
 748         struct GUID dc_guid;
 749
 750         for (i=0; i<num_dcs; i++) {
 751
 752                 ZERO_STRUCT(r);
 753
 754                 if ((ads_cldap_netlogon(dclist[i]->hostname,
 755                                         domain_name, &r)) &&
 756                     (check_cldap_reply_required_flags(r.flags, flags))) {
 757                         valid_dc = True;
 758                         break;
 759                 }
 760
 761                 continue;
 762         }
 763
 764         if (!valid_dc) {
 765                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 766         }
 767
 768         dc_flags = r.flags;
 769
 770         if (flags & DS_RETURN_FLAT_NAME) {
 771                 if (!strlen(r.netbios_hostname) || !strlen(r.netbios_domain)) {
 772                         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 773                 }
 774                 dc_hostname = r.netbios_hostname;
 775                 dc_domain_name = r.netbios_domain;
 776         } else if (flags & DS_RETURN_DNS_NAME) {
 777                 if (!strlen(r.hostname) || !strlen(r.domain)) {
 778                         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 779                 }
 780                 dc_hostname = r.hostname;
 781                 dc_domain_name = r.domain;
 782                 dc_flags |= ADS_DNS_DOMAIN | ADS_DNS_CONTROLLER;
 783         } else {
 784                 /* FIXME */
 785                 dc_hostname = r.hostname;
 786                 dc_domain_name = r.domain;
 787                 dc_flags |= ADS_DNS_DOMAIN | ADS_DNS_CONTROLLER;
 788         }
 789
 790         if (flags & DS_IP_REQUIRED) {
 791                 char addr[INET6_ADDRSTRLEN];
 792                 print_sockaddr(addr, sizeof(addr), &dclist[i]->ss);
 793                 dc_address = talloc_asprintf(mem_ctx, "\\\\%s",
 794                                                 addr);
 795                 dc_address_type = ADS_INET_ADDRESS;
 796         } else {
 797                 dc_address = talloc_asprintf(mem_ctx, "\\\\%s",
 798                                              r.netbios_hostname);
 799                 dc_address_type = ADS_NETBIOS_ADDRESS;
 800         }
 801         NT_STATUS_HAVE_NO_MEMORY(dc_address);
 802         smb_uuid_unpack(r.guid, &dc_guid);
 803
 804         if (r.forest) {
 805                 dc_flags |= ADS_DNS_FOREST;
 806         }
 807
 808         return make_domain_controller_info(mem_ctx,
 809                                            dc_hostname,
 810                                            dc_address,
 811                                            dc_address_type,
 812                                            &dc_guid,
 813                                            dc_domain_name,
 814                                            r.forest,
 815                                            dc_flags,
 816                                            r.server_site_name,
 817                                            r.client_site_name,
 818                                            info);
 819
 820 }
 821
 822 /****************************************************************
 823 ****************************************************************/
 824
 825 static NTSTATUS process_dc_netbios(TALLOC_CTX *mem_ctx,
 826                                    const char *domain_name,
 827                                    uint32_t flags,
 828                                    struct ip_service_name **dclist,
 829                                    int num_dcs,
 830                                    struct DS_DOMAIN_CONTROLLER_INFO **info)
 831 {
 832         /* FIXME: code here */
 833
 834         return NT_STATUS_NOT_SUPPORTED;
 835 }
 836
 837 /****************************************************************
 838 ****************************************************************/
 839
 840 static NTSTATUS DsGetDcName_rediscover(TALLOC_CTX *mem_ctx,
 841                                        const char *domain_name,
 842                                        struct GUID *domain_guid,
 843                                        uint32_t flags,
 844                                        const char *site_name,
 845                                        struct DS_DOMAIN_CONTROLLER_INFO **info)
 846 {
 847         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 848         struct ip_service_name *dclist;
 849         int num_dcs;
 850
 851         DEBUG(10,("DsGetDcName_rediscover\n"));
 852
 853         if (flags & DS_IS_FLAT_NAME) {
 854
 855                 status = discover_dc_netbios(mem_ctx, domain_name, flags,
 856                                              &dclist, &num_dcs);
 857                 NT_STATUS_NOT_OK_RETURN(status);
 858
 859                 return process_dc_netbios(mem_ctx, domain_name, flags,
 860                                           &dclist, num_dcs, info);
 861         }
 862
 863         if (flags & DS_IS_DNS_NAME) {
 864
 865                 status = discover_dc_dns(mem_ctx, domain_name, domain_guid,
 866                                          flags, site_name, &dclist, &num_dcs);
 867                 NT_STATUS_NOT_OK_RETURN(status);
 868
 869                 return process_dc_dns(mem_ctx, domain_name, flags,
 870                                       &dclist, num_dcs, info);
 871         }
 872
 873         status = discover_dc_dns(mem_ctx, domain_name, domain_guid, flags,
 874                                  site_name, &dclist, &num_dcs);
 875
 876         if (NT_STATUS_IS_OK(status) && num_dcs != 0) {
 877
 878                 status = process_dc_dns(mem_ctx, domain_name, flags, &dclist,
 879                                         num_dcs, info);
 880                 if (NT_STATUS_IS_OK(status)) {
 881                         return status;
 882                 }
 883         }
 884
 885         status = discover_dc_netbios(mem_ctx, domain_name, flags, &dclist,
 886                                      &num_dcs);
 887         NT_STATUS_NOT_OK_RETURN(status);
 888
 889         return process_dc_netbios(mem_ctx, domain_name, flags, &dclist,
 890                                   num_dcs, info);
 891 }
 892
 893 /********************************************************************
 894  DsGetDcName.
 895
 896  This will be the only public function here.
 897 ********************************************************************/
 898
 899 NTSTATUS DsGetDcName(TALLOC_CTX *mem_ctx,
 900                      const char *computer_name,
 901                      const char *domain_name,
 902                      struct GUID *domain_guid,
 903                      const char *site_name,
 904                      uint32_t flags,
 905                      struct DS_DOMAIN_CONTROLLER_INFO **info)
 906 {
 907         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 908         struct DS_DOMAIN_CONTROLLER_INFO *myinfo = NULL;
 909
 910         DEBUG(10,("DsGetDcName: computer_name: %s, domain_name: %s, "
 911                   "domain_guid: %s, site_name: %s, flags: 0x%08x\n",
 912                   computer_name, domain_name,
 913                   domain_guid ? GUID_string(mem_ctx, domain_guid) : "(null)",
 914                   site_name, flags));
 915
 916         *info = NULL;
 917
 918         if (!check_allowed_required_flags(flags)) {
 919                 DEBUG(0,("invalid flags specified\n"));
 920                 return NT_STATUS_INVALID_PARAMETER;
 921         }
 922
 923         if (flags & DS_FORCE_REDISCOVERY) {
 924                 goto rediscover;
 925         }
 926
 927         status = DsGetDcName_cached(mem_ctx, domain_name, domain_guid,
 928                                     flags, site_name, &myinfo);
 929         if (NT_STATUS_IS_OK(status)) {
 930                 *info = myinfo;
 931                 return status;
 932         }
 933
 934         if (flags & DS_BACKGROUND_ONLY) {
 935                 return status;
 936         }
 937
 938  rediscover:
 939         status = DsGetDcName_rediscover(mem_ctx, domain_name,
 940                                         domain_guid, flags, site_name,
 941                                         &myinfo);
 942
 943         if (NT_STATUS_IS_OK(status)) {
 944                 DsGetDcName_cache_store(mem_ctx, domain_name, myinfo);
 945                 *info = myinfo;
 946         }
 947
 948         return status;
 949 }