source3/libsmb/dsgetdcname.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    dsgetdcname
   5
   6    Copyright (C) Gerald Carter 2006
   7    Copyright (C) Guenther Deschner 2007-2008
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "libads/sitename_cache.h"
  25
  26 #define DSGETDCNAME_FMT "DSGETDCNAME/DOMAIN/%s"
  27 /* 15 minutes */
  28 #define DSGETDCNAME_CACHE_TTL   60*15
  29
  30 struct ip_service_name {
  31         struct sockaddr_storage ss;
  32         unsigned port;
  33         const char *hostname;
  34 };
  35
  36 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
  37                                               uint32_t flags,
  38                                               struct sockaddr_storage *ss,
  39                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *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 (!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         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 138         if (!key) {
 139                 return NT_STATUS_NO_MEMORY;
 140         }
 141
 142         if (!gencache_del(key)) {
 143                 return NT_STATUS_UNSUCCESSFUL;
 144         }
 145
 146         return NT_STATUS_OK;
 147 }
 148
 149 /****************************************************************
 150 ****************************************************************/
 151
 152 static NTSTATUS dsgetdcname_cache_store(TALLOC_CTX *mem_ctx,
 153                                         const char *domain_name,
 154                                         const DATA_BLOB *blob)
 155 {
 156         time_t expire_time;
 157         char *key;
 158         bool ret = false;
 159
 160         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 161         if (!key) {
 162                 return NT_STATUS_NO_MEMORY;
 163         }
 164
 165         expire_time = time(NULL) + DSGETDCNAME_CACHE_TTL;
 166
 167         ret = gencache_set_data_blob(key, blob, expire_time);
 168
 169         return ret ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
 170 }
 171
 172 /****************************************************************
 173 ****************************************************************/
 174
 175 static NTSTATUS store_cldap_reply(TALLOC_CTX *mem_ctx,
 176                                   uint32_t flags,
 177                                   struct sockaddr_storage *ss,
 178                                   uint32_t nt_version,
 179                                   struct NETLOGON_SAM_LOGON_RESPONSE_EX *r)
 180 {
 181         DATA_BLOB blob;
 182         enum ndr_err_code ndr_err;
 183         NTSTATUS status;
 184         char addr[INET6_ADDRSTRLEN];
 185
 186        print_sockaddr(addr, sizeof(addr), ss);
 187
 188         /* FIXME */
 189         r->sockaddr_size = 0x10; /* the w32 winsock addr size */
 190         r->sockaddr.sockaddr_family = 2; /* AF_INET */
 191         r->sockaddr.pdc_ip = talloc_strdup(mem_ctx, addr);
 192
 193         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, NULL, r,
 194                        (ndr_push_flags_fn_t)ndr_push_NETLOGON_SAM_LOGON_RESPONSE_EX);
 195         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 196                 return ndr_map_error2ntstatus(ndr_err);
 197         }
 198
 199         if (r->domain) {
 200                 status = dsgetdcname_cache_store(mem_ctx, r->domain, &blob);
 201                 if (!NT_STATUS_IS_OK(status)) {
 202                         goto done;
 203                 }
 204                 if (r->client_site) {
 205                         sitename_store(r->domain, r->client_site);
 206                 }
 207         }
 208         if (r->dns_domain) {
 209                 status = dsgetdcname_cache_store(mem_ctx, r->dns_domain, &blob);
 210                 if (!NT_STATUS_IS_OK(status)) {
 211                         goto done;
 212                 }
 213                 if (r->client_site) {
 214                         sitename_store(r->dns_domain, r->client_site);
 215                 }
 216         }
 217
 218         status = NT_STATUS_OK;
 219
 220  done:
 221         data_blob_free(&blob);
 222
 223         return status;
 224 }
 225
 226 /****************************************************************
 227 ****************************************************************/
 228
 229 static uint32_t get_cldap_reply_server_flags(struct netlogon_samlogon_response *r,
 230                                              uint32_t nt_version)
 231 {
 232         switch (nt_version & 0x0000001f) {
 233                 case 0:
 234                 case 1:
 235                 case 16:
 236                 case 17:
 237                         return 0;
 238                 case 2:
 239                 case 3:
 240                 case 18:
 241                 case 19:
 242                         return r->data.nt5.server_type;
 243                 case 4:
 244                 case 5:
 245                 case 6:
 246                 case 7:
 247                         return r->data.nt5_ex.server_type;
 248                 case 8:
 249                 case 9:
 250                 case 10:
 251                 case 11:
 252                 case 12:
 253                 case 13:
 254                 case 14:
 255                 case 15:
 256                         return r->data.nt5_ex.server_type;
 257                 case 20:
 258                 case 21:
 259                 case 22:
 260                 case 23:
 261                 case 24:
 262                 case 25:
 263                 case 26:
 264                 case 27:
 265                 case 28:
 266                         return r->data.nt5_ex.server_type;
 267                 case 29:
 268                 case 30:
 269                 case 31:
 270                         return r->data.nt5_ex.server_type;
 271                 default:
 272                         return 0;
 273         }
 274 }
 275
 276 /****************************************************************
 277 ****************************************************************/
 278
 279 #define RETURN_ON_FALSE(x) if (!(x)) return false;
 280
 281 static bool check_cldap_reply_required_flags(uint32_t ret_flags,
 282                                              uint32_t req_flags)
 283 {
 284         if (ret_flags == 0) {
 285                 return true;
 286         }
 287
 288         if (req_flags & DS_PDC_REQUIRED)
 289                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_PDC);
 290
 291         if (req_flags & DS_GC_SERVER_REQUIRED)
 292                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_GC);
 293
 294         if (req_flags & DS_ONLY_LDAP_NEEDED)
 295                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_LDAP);
 296
 297         if ((req_flags & DS_DIRECTORY_SERVICE_REQUIRED) ||
 298             (req_flags & DS_DIRECTORY_SERVICE_PREFERRED))
 299                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_DS);
 300
 301         if (req_flags & DS_KDC_REQUIRED)
 302                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_KDC);
 303
 304         if (req_flags & DS_TIMESERV_REQUIRED)
 305                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_TIMESERV);
 306
 307         if (req_flags & DS_WRITABLE_REQUIRED)
 308                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_WRITABLE);
 309
 310         return true;
 311 }
 312
 313 /****************************************************************
 314 ****************************************************************/
 315
 316 static NTSTATUS dsgetdcname_cache_fetch(TALLOC_CTX *mem_ctx,
 317                                         const char *domain_name,
 318                                         const struct GUID *domain_guid,
 319                                         uint32_t flags,
 320                                         const char *site_name,
 321                                         struct netr_DsRGetDCNameInfo **info_p)
 322 {
 323         char *key;
 324         DATA_BLOB blob;
 325         enum ndr_err_code ndr_err;
 326         struct netr_DsRGetDCNameInfo *info;
 327         struct NETLOGON_SAM_LOGON_RESPONSE_EX r;
 328         NTSTATUS status;
 329
 330         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 331         if (!key) {
 332                 return NT_STATUS_NO_MEMORY;
 333         }
 334
 335         if (!gencache_get_data_blob(key, &blob, NULL, NULL)) {
 336                 return NT_STATUS_NOT_FOUND;
 337         }
 338
 339         info = TALLOC_ZERO_P(mem_ctx, struct netr_DsRGetDCNameInfo);
 340         if (!info) {
 341                 return NT_STATUS_NO_MEMORY;
 342         }
 343
 344         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, NULL, &r,
 345                       (ndr_pull_flags_fn_t)ndr_pull_NETLOGON_SAM_LOGON_RESPONSE_EX);
 346
 347         data_blob_free(&blob);
 348         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 349                 dsgetdcname_cache_delete(mem_ctx, domain_name);
 350                 return ndr_map_error2ntstatus(ndr_err);
 351         }
 352
 353         status = make_dc_info_from_cldap_reply(mem_ctx, flags, NULL,
 354                                                &r, &info);
 355         if (!NT_STATUS_IS_OK(status)) {
 356                 return status;
 357         }
 358
 359         if (DEBUGLEVEL >= 10) {
 360                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, info);
 361         }
 362
 363         /* check flags */
 364         if (!check_cldap_reply_required_flags(info->dc_flags, flags)) {
 365                 DEBUG(10,("invalid flags\n"));
 366                 return NT_STATUS_INVALID_PARAMETER;
 367         }
 368
 369         if ((flags & DS_IP_REQUIRED) &&
 370             (info->dc_address_type != DS_ADDRESS_TYPE_INET)) {
 371                 return NT_STATUS_INVALID_PARAMETER_MIX;
 372         }
 373
 374         *info_p = info;
 375
 376         return NT_STATUS_OK;
 377 }
 378
 379 /****************************************************************
 380 ****************************************************************/
 381
 382 static NTSTATUS dsgetdcname_cached(TALLOC_CTX *mem_ctx,
 383                                    struct messaging_context *msg_ctx,
 384                                    const char *domain_name,
 385                                    const struct GUID *domain_guid,
 386                                    uint32_t flags,
 387                                    const char *site_name,
 388                                    struct netr_DsRGetDCNameInfo **info)
 389 {
 390         NTSTATUS status;
 391
 392         status = dsgetdcname_cache_fetch(mem_ctx, domain_name, domain_guid,
 393                                          flags, site_name, info);
 394         if (!NT_STATUS_IS_OK(status)
 395             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 396                 DEBUG(10,("dsgetdcname_cached: cache fetch failed with: %s\n",
 397                         nt_errstr(status)));
 398                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 399         }
 400
 401         if (flags & DS_BACKGROUND_ONLY) {
 402                 return status;
 403         }
 404
 405         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 406                 struct netr_DsRGetDCNameInfo *dc_info;
 407
 408                 status = dsgetdcname(mem_ctx, msg_ctx, domain_name,
 409                                      domain_guid, site_name,
 410                                      flags | DS_FORCE_REDISCOVERY,
 411                                      &dc_info);
 412
 413                 if (!NT_STATUS_IS_OK(status)) {
 414                         return status;
 415                 }
 416
 417                 *info = dc_info;
 418         }
 419
 420         return status;
 421 }
 422
 423 /****************************************************************
 424 ****************************************************************/
 425
 426 static bool check_allowed_required_flags(uint32_t flags,
 427                                          const char *site_name)
 428 {
 429         uint32_t return_type = flags & (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME);
 430         uint32_t offered_type = flags & (DS_IS_FLAT_NAME|DS_IS_DNS_NAME);
 431         uint32_t query_type = flags & (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY);
 432
 433         /* FIXME: check for DSGETDC_VALID_FLAGS and check for excluse bits
 434          * (DS_PDC_REQUIRED, DS_KDC_REQUIRED, DS_GC_SERVER_REQUIRED) */
 435
 436         debug_dsdcinfo_flags(10, flags);
 437
 438         if ((flags & DS_TRY_NEXTCLOSEST_SITE) && site_name) {
 439                 return false;
 440         }
 441
 442         if (return_type == (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME)) {
 443                 return false;
 444         }
 445
 446         if (offered_type == (DS_IS_DNS_NAME|DS_IS_FLAT_NAME)) {
 447                 return false;
 448         }
 449
 450         if (query_type == (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY)) {
 451                 return false;
 452         }
 453
 454 #if 0
 455         if ((flags & DS_RETURN_DNS_NAME) && (!(flags & DS_IP_REQUIRED))) {
 456                 printf("gd: here5 \n");
 457                 return false;
 458         }
 459 #endif
 460         return true;
 461 }
 462
 463 /****************************************************************
 464 ****************************************************************/
 465
 466 static NTSTATUS discover_dc_netbios(TALLOC_CTX *mem_ctx,
 467                                     const char *domain_name,
 468                                     uint32_t flags,
 469                                     struct ip_service_name **returned_dclist,
 470                                     int *returned_count)
 471 {
 472         NTSTATUS status;
 473         enum nbt_name_type name_type = NBT_NAME_LOGON;
 474         struct ip_service *iplist;
 475         int i;
 476         struct ip_service_name *dclist = NULL;
 477         int count;
 478
 479         *returned_dclist = NULL;
 480         *returned_count = 0;
 481
 482         if (lp_disable_netbios()) {
 483                 return NT_STATUS_NOT_SUPPORTED;
 484         }
 485
 486         if (flags & DS_PDC_REQUIRED) {
 487                 name_type = NBT_NAME_PDC;
 488         }
 489
 490         status = internal_resolve_name(domain_name, name_type, NULL,
 491                                        &iplist, &count,
 492                                        "lmhosts wins bcast");
 493         if (!NT_STATUS_IS_OK(status)) {
 494                 DEBUG(10,("discover_dc_netbios: failed to find DC\n"));
 495                 return status;
 496         }
 497
 498         dclist = TALLOC_ZERO_ARRAY(mem_ctx, struct ip_service_name, count);
 499         if (!dclist) {
 500                 return NT_STATUS_NO_MEMORY;
 501         }
 502
 503         for (i=0; i<count; i++) {
 504
 505                 char addr[INET6_ADDRSTRLEN];
 506                 struct ip_service_name *r = &dclist[i];
 507
 508                 print_sockaddr(addr, sizeof(addr),
 509                                &iplist[i].ss);
 510
 511                 r->ss   = iplist[i].ss;
 512                 r->port = iplist[i].port;
 513                 r->hostname = talloc_strdup(mem_ctx, addr);
 514                 if (!r->hostname) {
 515                         return NT_STATUS_NO_MEMORY;
 516                 }
 517
 518         }
 519
 520         *returned_dclist = dclist;
 521         *returned_count = count;
 522
 523         return NT_STATUS_OK;
 524 }
 525
 526 /****************************************************************
 527 ****************************************************************/
 528
 529 static NTSTATUS discover_dc_dns(TALLOC_CTX *mem_ctx,
 530                                 const char *domain_name,
 531                                 const struct GUID *domain_guid,
 532                                 uint32_t flags,
 533                                 const char *site_name,
 534                                 struct ip_service_name **returned_dclist,
 535                                 int *return_count)
 536 {
 537         int i, j;
 538         NTSTATUS status;
 539         struct dns_rr_srv *dcs = NULL;
 540         int numdcs = 0;
 541         int numaddrs = 0;
 542         struct ip_service_name *dclist = NULL;
 543         int count = 0;
 544
 545         if (flags & DS_PDC_REQUIRED) {
 546                 status = ads_dns_query_pdc(mem_ctx, domain_name,
 547                                            &dcs, &numdcs);
 548         } else if (flags & DS_GC_SERVER_REQUIRED) {
 549                 status = ads_dns_query_gcs(mem_ctx, domain_name, site_name,
 550                                            &dcs, &numdcs);
 551         } else if (flags & DS_KDC_REQUIRED) {
 552                 status = ads_dns_query_kdcs(mem_ctx, domain_name, site_name,
 553                                             &dcs, &numdcs);
 554         } else if (flags & DS_DIRECTORY_SERVICE_REQUIRED) {
 555                 status = ads_dns_query_dcs(mem_ctx, domain_name, site_name,
 556                                            &dcs, &numdcs);
 557         } else if (domain_guid) {
 558                 status = ads_dns_query_dcs_guid(mem_ctx, domain_name,
 559                                                 domain_guid, &dcs, &numdcs);
 560         } else {
 561                 status = ads_dns_query_dcs(mem_ctx, domain_name, site_name,
 562                                            &dcs, &numdcs);
 563         }
 564
 565         if (!NT_STATUS_IS_OK(status)) {
 566                 return status;
 567         }
 568
 569         if (numdcs == 0) {
 570                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 571         }
 572
 573         for (i=0;i<numdcs;i++) {
 574                 numaddrs += MAX(dcs[i].num_ips,1);
 575         }
 576
 577         dclist = TALLOC_ZERO_ARRAY(mem_ctx,
 578                                    struct ip_service_name,
 579                                    numaddrs);
 580         if (!dclist) {
 581                 return NT_STATUS_NO_MEMORY;
 582         }
 583
 584         /* now unroll the list of IP addresses */
 585
 586         *return_count = 0;
 587         i = 0;
 588         j = 0;
 589
 590         while ((i < numdcs) && (count < numaddrs)) {
 591
 592                 struct ip_service_name *r = &dclist[count];
 593
 594                 r->port = dcs[i].port;
 595                 r->hostname = dcs[i].hostname;
 596
 597                 /* If we don't have an IP list for a name, lookup it up */
 598
 599                 if (!dcs[i].ss_s) {
 600                         interpret_string_addr_prefer_ipv4(&r->ss,
 601                                                 dcs[i].hostname, 0);
 602                         i++;
 603                         j = 0;
 604                 } else {
 605                         /* use the IP addresses from the SRV sresponse */
 606
 607                         if (j >= dcs[i].num_ips) {
 608                                 i++;
 609                                 j = 0;
 610                                 continue;
 611                         }
 612
 613                         r->ss = dcs[i].ss_s[j];
 614                         j++;
 615                 }
 616
 617                 /* make sure it is a valid IP.  I considered checking the
 618                  * negative connection cache, but this is the wrong place for
 619                  * it.  Maybe only as a hac.  After think about it, if all of
 620                  * the IP addresses retuend from DNS are dead, what hope does a
 621                  * netbios name lookup have?  The standard reason for falling
 622                  * back to netbios lookups is that our DNS server doesn't know
 623                  * anything about the DC's   -- jerry */
 624
 625                 if (!is_zero_addr((struct sockaddr *)(void *)&r->ss)) {
 626                         count++;
 627                         continue;
 628                 }
 629         }
 630
 631         *returned_dclist = dclist;
 632         *return_count = count;
 633
 634         if (count > 0) {
 635                 return NT_STATUS_OK;
 636         }
 637
 638         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 639 }
 640
 641 /****************************************************************
 642 ****************************************************************/
 643
 644 static NTSTATUS make_domain_controller_info(TALLOC_CTX *mem_ctx,
 645                                             const char *dc_unc,
 646                                             const char *dc_address,
 647                                             uint32_t dc_address_type,
 648                                             const struct GUID *domain_guid,
 649                                             const char *domain_name,
 650                                             const char *forest_name,
 651                                             uint32_t flags,
 652                                             const char *dc_site_name,
 653                                             const char *client_site_name,
 654                                             struct netr_DsRGetDCNameInfo **info_out)
 655 {
 656         struct netr_DsRGetDCNameInfo *info;
 657
 658         info = TALLOC_ZERO_P(mem_ctx, struct netr_DsRGetDCNameInfo);
 659         NT_STATUS_HAVE_NO_MEMORY(info);
 660
 661         if (dc_unc) {
 662                 info->dc_unc = talloc_strdup(mem_ctx, dc_unc);
 663                 NT_STATUS_HAVE_NO_MEMORY(info->dc_unc);
 664         }
 665
 666         if (dc_address) {
 667                 if (!(dc_address[0] == '\\' && dc_address[1] == '\\')) {
 668                         info->dc_address = talloc_asprintf(mem_ctx, "\\\\%s",
 669                                                            dc_address);
 670                 } else {
 671                         info->dc_address = talloc_strdup(mem_ctx, dc_address);
 672                 }
 673                 NT_STATUS_HAVE_NO_MEMORY(info->dc_address);
 674         }
 675
 676         info->dc_address_type = dc_address_type;
 677
 678         if (domain_guid) {
 679                 info->domain_guid = *domain_guid;
 680         }
 681
 682         if (domain_name) {
 683                 info->domain_name = talloc_strdup(mem_ctx, domain_name);
 684                 NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
 685         }
 686
 687         if (forest_name && *forest_name) {
 688                 info->forest_name = talloc_strdup(mem_ctx, forest_name);
 689                 NT_STATUS_HAVE_NO_MEMORY(info->forest_name);
 690                 flags |= DS_DNS_FOREST_ROOT;
 691         }
 692
 693         info->dc_flags = flags;
 694
 695         if (dc_site_name) {
 696                 info->dc_site_name = talloc_strdup(mem_ctx, dc_site_name);
 697                 NT_STATUS_HAVE_NO_MEMORY(info->dc_site_name);
 698         }
 699
 700         if (client_site_name) {
 701                 info->client_site_name = talloc_strdup(mem_ctx,
 702                                                        client_site_name);
 703                 NT_STATUS_HAVE_NO_MEMORY(info->client_site_name);
 704         }
 705
 706         *info_out = info;
 707
 708         return NT_STATUS_OK;
 709 }
 710
 711 /****************************************************************
 712 ****************************************************************/
 713
 714 static void map_dc_and_domain_names(uint32_t flags,
 715                                     const char *dc_name,
 716                                     const char *domain_name,
 717                                     const char *dns_dc_name,
 718                                     const char *dns_domain_name,
 719                                     uint32_t *dc_flags,
 720                                     const char **hostname_p,
 721                                     const char **domain_p)
 722 {
 723         switch (flags & 0xf0000000) {
 724                 case DS_RETURN_FLAT_NAME:
 725                         if (dc_name && domain_name &&
 726                             *dc_name && *domain_name) {
 727                                 *hostname_p = dc_name;
 728                                 *domain_p = domain_name;
 729                                 break;
 730                         }
 731                 case DS_RETURN_DNS_NAME:
 732                 default:
 733                         if (dns_dc_name && dns_domain_name &&
 734                             *dns_dc_name && *dns_domain_name) {
 735                                 *hostname_p = dns_dc_name;
 736                                 *domain_p = dns_domain_name;
 737                                 *dc_flags |= DS_DNS_DOMAIN | DS_DNS_CONTROLLER;
 738                                 break;
 739                         }
 740                         if (dc_name && domain_name &&
 741                             *dc_name && *domain_name) {
 742                                 *hostname_p = dc_name;
 743                                 *domain_p = domain_name;
 744                                 break;
 745                         }
 746         }
 747 }
 748
 749 /****************************************************************
 750 ****************************************************************/
 751
 752 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
 753                                               uint32_t flags,
 754                                               struct sockaddr_storage *ss,
 755                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
 756                                               struct netr_DsRGetDCNameInfo **info)
 757 {
 758         const char *dc_hostname = NULL;
 759         const char *dc_domain_name = NULL;
 760         const char *dc_address = NULL;
 761         const char *dc_forest = NULL;
 762         uint32_t dc_address_type = 0;
 763         uint32_t dc_flags = 0;
 764         struct GUID *dc_domain_guid = NULL;
 765         const char *dc_server_site = NULL;
 766         const char *dc_client_site = NULL;
 767
 768         char addr[INET6_ADDRSTRLEN];
 769
 770         if (ss) {
 771                 print_sockaddr(addr, sizeof(addr), ss);
 772                 dc_address = addr;
 773                 dc_address_type = DS_ADDRESS_TYPE_INET;
 774         }
 775
 776         if (!ss && r->sockaddr.pdc_ip) {
 777                 dc_address      = r->sockaddr.pdc_ip;
 778                 dc_address_type = DS_ADDRESS_TYPE_INET;
 779         } else {
 780                 dc_address      = r->pdc_name;
 781                 dc_address_type = DS_ADDRESS_TYPE_NETBIOS;
 782         }
 783
 784         map_dc_and_domain_names(flags,
 785                                 r->pdc_name,
 786                                 r->domain,
 787                                 r->pdc_dns_name,
 788                                 r->dns_domain,
 789                                 &dc_flags,
 790                                 &dc_hostname,
 791                                 &dc_domain_name);
 792
 793         dc_flags        |= r->server_type;
 794         dc_forest       = r->forest;
 795         dc_domain_guid  = &r->domain_uuid;
 796         dc_server_site  = r->server_site;
 797         dc_client_site  = r->client_site;
 798
 799         return make_domain_controller_info(mem_ctx,
 800                                            dc_hostname,
 801                                            dc_address,
 802                                            dc_address_type,
 803                                            dc_domain_guid,
 804                                            dc_domain_name,
 805                                            dc_forest,
 806                                            dc_flags,
 807                                            dc_server_site,
 808                                            dc_client_site,
 809                                            info);
 810 }
 811
 812 /****************************************************************
 813 ****************************************************************/
 814
 815 static uint32_t map_ds_flags_to_nt_version(uint32_t flags)
 816 {
 817         uint32_t nt_version = 0;
 818
 819         if (flags & DS_PDC_REQUIRED) {
 820                 nt_version |= NETLOGON_NT_VERSION_PDC;
 821         }
 822
 823         if (flags & DS_GC_SERVER_REQUIRED) {
 824                 nt_version |= NETLOGON_NT_VERSION_GC;
 825         }
 826
 827         if (flags & DS_TRY_NEXTCLOSEST_SITE) {
 828                 nt_version |= NETLOGON_NT_VERSION_WITH_CLOSEST_SITE;
 829         }
 830
 831         if (flags & DS_IP_REQUIRED) {
 832                 nt_version |= NETLOGON_NT_VERSION_IP;
 833         }
 834
 835         return nt_version;
 836 }
 837
 838 /****************************************************************
 839 ****************************************************************/
 840
 841 static NTSTATUS process_dc_dns(TALLOC_CTX *mem_ctx,
 842                                const char *domain_name,
 843                                uint32_t flags,
 844                                struct ip_service_name *dclist,
 845                                int num_dcs,
 846                                struct netr_DsRGetDCNameInfo **info)
 847 {
 848         int i = 0;
 849         bool valid_dc = false;
 850         struct netlogon_samlogon_response *r = NULL;
 851         uint32_t nt_version = NETLOGON_NT_VERSION_5 |
 852                               NETLOGON_NT_VERSION_5EX;
 853         uint32_t ret_flags = 0;
 854         NTSTATUS status;
 855
 856         nt_version |= map_ds_flags_to_nt_version(flags);
 857
 858         for (i=0; i<num_dcs; i++) {
 859
 860                 DEBUG(10,("LDAP ping to %s\n", dclist[i].hostname));
 861
 862                 if (ads_cldap_netlogon(mem_ctx, dclist[i].hostname,
 863                                         domain_name,
 864                                         nt_version,
 865                                         &r))
 866                 {
 867                         nt_version = r->ntver;
 868                         ret_flags = get_cldap_reply_server_flags(r, nt_version);
 869
 870                         if (check_cldap_reply_required_flags(ret_flags, flags)) {
 871                                 valid_dc = true;
 872                                 break;
 873                         }
 874                 }
 875
 876                 continue;
 877         }
 878
 879         if (!valid_dc) {
 880                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 881         }
 882
 883         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 884                                                &r->data.nt5_ex, info);
 885         if (NT_STATUS_IS_OK(status)) {
 886                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 887                                          nt_version, &r->data.nt5_ex);
 888         }
 889
 890         return status;
 891 }
 892
 893 /****************************************************************
 894 ****************************************************************/
 895
 896 static struct event_context *ev_context(void)
 897 {
 898         static struct event_context *ctx;
 899
 900         if (!ctx && !(ctx = event_context_init(NULL))) {
 901                 smb_panic("Could not init event context");
 902         }
 903         return ctx;
 904 }
 905
 906 /****************************************************************
 907 ****************************************************************/
 908
 909 static struct messaging_context *msg_context(TALLOC_CTX *mem_ctx)
 910 {
 911         static struct messaging_context *ctx;
 912
 913         if (!ctx && !(ctx = messaging_init(mem_ctx, procid_self(),
 914                                            ev_context()))) {
 915                 smb_panic("Could not init messaging context");
 916         }
 917         return ctx;
 918 }
 919
 920 /****************************************************************
 921 ****************************************************************/
 922
 923 static NTSTATUS process_dc_netbios(TALLOC_CTX *mem_ctx,
 924                                    struct messaging_context *msg_ctx,
 925                                    const char *domain_name,
 926                                    uint32_t flags,
 927                                    struct ip_service_name *dclist,
 928                                    int num_dcs,
 929                                    struct netr_DsRGetDCNameInfo **info)
 930 {
 931         struct sockaddr_storage ss;
 932         struct ip_service ip_list;
 933         enum nbt_name_type name_type = NBT_NAME_LOGON;
 934         NTSTATUS status;
 935         int i;
 936         const char *dc_name = NULL;
 937         fstring tmp_dc_name;
 938         struct netlogon_samlogon_response *r = NULL;
 939         bool store_cache = false;
 940         uint32_t nt_version = NETLOGON_NT_VERSION_1 |
 941                               NETLOGON_NT_VERSION_5 |
 942                               NETLOGON_NT_VERSION_5EX_WITH_IP;
 943
 944         if (!msg_ctx) {
 945                 msg_ctx = msg_context(mem_ctx);
 946         }
 947
 948         if (flags & DS_PDC_REQUIRED) {
 949                 name_type = NBT_NAME_PDC;
 950         }
 951
 952         nt_version |= map_ds_flags_to_nt_version(flags);
 953
 954         DEBUG(10,("process_dc_netbios\n"));
 955
 956         for (i=0; i<num_dcs; i++) {
 957
 958                 ip_list.ss = dclist[i].ss;
 959                 ip_list.port = 0;
 960
 961                 if (!interpret_string_addr_prefer_ipv4(&ss, dclist[i].hostname, AI_NUMERICHOST)) {
 962                         return NT_STATUS_UNSUCCESSFUL;
 963                 }
 964
 965                 if (send_getdc_request(mem_ctx, msg_ctx,
 966                                        &dclist[i].ss, domain_name,
 967                                        NULL, nt_version))
 968                 {
 969                         int k;
 970                         smb_msleep(300);
 971                         for (k=0; k<5; k++) {
 972                                 if (receive_getdc_response(mem_ctx,
 973                                                            &dclist[i].ss,
 974                                                            domain_name,
 975                                                            &nt_version,
 976                                                            &dc_name,
 977                                                            &r)) {
 978                                         store_cache = true;
 979                                         namecache_store(dc_name, NBT_NAME_SERVER, 1, &ip_list);
 980                                         goto make_reply;
 981                                 }
 982                                 smb_msleep(1500);
 983                         }
 984                 }
 985
 986                 if (name_status_find(domain_name,
 987                                      name_type,
 988                                      NBT_NAME_SERVER,
 989                                      &dclist[i].ss,
 990                                      tmp_dc_name))
 991                 {
 992                         struct NETLOGON_SAM_LOGON_RESPONSE_NT40 logon1;
 993
 994                         r = TALLOC_ZERO_P(mem_ctx, struct netlogon_samlogon_response);
 995                         NT_STATUS_HAVE_NO_MEMORY(r);
 996
 997                         ZERO_STRUCT(logon1);
 998
 999                         nt_version = NETLOGON_NT_VERSION_1;
1000
1001                         logon1.nt_version = nt_version;
1002                         logon1.server = tmp_dc_name;
1003                         logon1.domain = talloc_strdup_upper(mem_ctx, domain_name);
1004                         NT_STATUS_HAVE_NO_MEMORY(logon1.domain);
1005
1006                         r->data.nt4 = logon1;
1007                         r->ntver = nt_version;
1008
1009                         map_netlogon_samlogon_response(r);
1010
1011                         namecache_store(tmp_dc_name, NBT_NAME_SERVER, 1, &ip_list);
1012
1013                         goto make_reply;
1014                 }
1015         }
1016
1017         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1018
1019  make_reply:
1020
1021         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1022                                                &r->data.nt5_ex, info);
1023         if (NT_STATUS_IS_OK(status) && store_cache) {
1024                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1025                                          nt_version, &r->data.nt5_ex);
1026         }
1027
1028         return status;
1029 }
1030
1031 /****************************************************************
1032 ****************************************************************/
1033
1034 static NTSTATUS dsgetdcname_rediscover(TALLOC_CTX *mem_ctx,
1035                                        struct messaging_context *msg_ctx,
1036                                        const char *domain_name,
1037                                        const struct GUID *domain_guid,
1038                                        uint32_t flags,
1039                                        const char *site_name,
1040                                        struct netr_DsRGetDCNameInfo **info)
1041 {
1042         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1043         struct ip_service_name *dclist = NULL;
1044         int num_dcs;
1045
1046         DEBUG(10,("dsgetdcname_rediscover\n"));
1047
1048         if (flags & DS_IS_FLAT_NAME) {
1049
1050                 status = discover_dc_netbios(mem_ctx, domain_name, flags,
1051                                              &dclist, &num_dcs);
1052                 NT_STATUS_NOT_OK_RETURN(status);
1053
1054                 return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags,
1055                                           dclist, num_dcs, info);
1056         }
1057
1058         if (flags & DS_IS_DNS_NAME) {
1059
1060                 status = discover_dc_dns(mem_ctx, domain_name, domain_guid,
1061                                          flags, site_name, &dclist, &num_dcs);
1062                 NT_STATUS_NOT_OK_RETURN(status);
1063
1064                 return process_dc_dns(mem_ctx, domain_name, flags,
1065                                       dclist, num_dcs, info);
1066         }
1067
1068         status = discover_dc_dns(mem_ctx, domain_name, domain_guid, flags,
1069                                  site_name, &dclist, &num_dcs);
1070
1071         if (NT_STATUS_IS_OK(status) && num_dcs != 0) {
1072
1073                 status = process_dc_dns(mem_ctx, domain_name, flags, dclist,
1074                                         num_dcs, info);
1075                 if (NT_STATUS_IS_OK(status)) {
1076                         return status;
1077                 }
1078         }
1079
1080         status = discover_dc_netbios(mem_ctx, domain_name, flags, &dclist,
1081                                      &num_dcs);
1082         NT_STATUS_NOT_OK_RETURN(status);
1083
1084         return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags, dclist,
1085                                   num_dcs, info);
1086 }
1087
1088 static bool is_closest_site(struct netr_DsRGetDCNameInfo *info)
1089 {
1090         if (info->dc_flags & DS_SERVER_CLOSEST) {
1091                 return true;
1092         }
1093
1094         if (!info->client_site_name) {
1095                 return true;
1096         }
1097
1098         if (!info->dc_site_name) {
1099                 return false;
1100         }
1101
1102         if (strcmp(info->client_site_name, info->dc_site_name) == 0) {
1103                 return true;
1104         }
1105
1106         return false;
1107 }
1108
1109 /********************************************************************
1110  dsgetdcname.
1111
1112  This will be the only public function here.
1113 ********************************************************************/
1114
1115 NTSTATUS dsgetdcname(TALLOC_CTX *mem_ctx,
1116                      struct messaging_context *msg_ctx,
1117                      const char *domain_name,
1118                      const struct GUID *domain_guid,
1119                      const char *site_name,
1120                      uint32_t flags,
1121                      struct netr_DsRGetDCNameInfo **info)
1122 {
1123         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1124         struct netr_DsRGetDCNameInfo *myinfo = NULL;
1125         char *query_site = NULL;
1126         bool first = true;
1127         struct netr_DsRGetDCNameInfo *first_info = NULL;
1128
1129         DEBUG(10,("dsgetdcname: domain_name: %s, "
1130                   "domain_guid: %s, site_name: %s, flags: 0x%08x\n",
1131                   domain_name,
1132                   domain_guid ? GUID_string(mem_ctx, domain_guid) : "(null)",
1133                   site_name, flags));
1134
1135         *info = NULL;
1136
1137         if (!check_allowed_required_flags(flags, site_name)) {
1138                 DEBUG(0,("invalid flags specified\n"));
1139                 return NT_STATUS_INVALID_PARAMETER;
1140         }
1141
1142         if ((site_name == NULL) || (site_name[0] == '\0')) {
1143                 query_site = sitename_fetch(domain_name);
1144         } else {
1145                 query_site = SMB_STRDUP(site_name);
1146         }
1147
1148         if (flags & DS_FORCE_REDISCOVERY) {
1149                 goto rediscover;
1150         }
1151
1152         status = dsgetdcname_cached(mem_ctx, msg_ctx, domain_name, domain_guid,
1153                                     flags, query_site, &myinfo);
1154         if (NT_STATUS_IS_OK(status)) {
1155                 goto done;
1156         }
1157
1158         if (flags & DS_BACKGROUND_ONLY) {
1159                 goto done;
1160         }
1161
1162  rediscover:
1163         status = dsgetdcname_rediscover(mem_ctx, msg_ctx, domain_name,
1164                                         domain_guid, flags, query_site,
1165                                         &myinfo);
1166
1167  done:
1168         SAFE_FREE(query_site);
1169
1170         if (!NT_STATUS_IS_OK(status)) {
1171                 if (!first) {
1172                         *info = first_info;
1173                         return NT_STATUS_OK;
1174                 }
1175                 return status;
1176         }
1177
1178         if (!first) {
1179                 TALLOC_FREE(first_info);
1180         } else if (!is_closest_site(myinfo)) {
1181                 first = false;
1182                 first_info = myinfo;
1183                 /* TODO: may use the next_closest_site here */
1184                 query_site = SMB_STRDUP(myinfo->client_site_name);
1185                 goto rediscover;
1186         }
1187
1188         *info = myinfo;
1189         return NT_STATUS_OK;
1190 }