source3/libsmb/dsgetdcname.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    dsgetdcname
   5
   6    Copyright (C) Gerald Carter 2006
   7    Copyright (C) Guenther Deschner 2007-2008
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "libsmb/dsgetdcname.h"
  25 #include "libsmb/namequery.h"
  26 #include "libads/sitename_cache.h"
  27 #include "../librpc/gen_ndr/ndr_netlogon.h"
  28 #include "libads/cldap.h"
  29 #include "lib/addns/dnsquery_srv.h"
  30 #include "libsmb/clidgram.h"
  31 #include "lib/gencache.h"
  32 #include "lib/util/util_net.h"
  33
  34 /* 15 minutes */
  35 #define DSGETDCNAME_CACHE_TTL   60*15
  36
  37 struct ip_service_name {
  38         struct samba_sockaddr sa;
  39         const char *hostname;
  40 };
  41
  42 static NTSTATUS make_dc_info_from_cldap_reply(
  43         TALLOC_CTX *mem_ctx,
  44         uint32_t flags,
  45         const struct samba_sockaddr *sa,
  46         struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
  47         struct netr_DsRGetDCNameInfo **info);
  48
  49 /****************************************************************
  50 ****************************************************************/
  51
  52 static void debug_dsdcinfo_flags(int lvl, uint32_t flags)
  53 {
  54         DEBUG(lvl,("debug_dsdcinfo_flags: 0x%08x\n\t", flags));
  55
  56         if (flags & DS_FORCE_REDISCOVERY)
  57                 DEBUGADD(lvl,("DS_FORCE_REDISCOVERY "));
  58         if (flags & 0x000000002)
  59                 DEBUGADD(lvl,("0x00000002 "));
  60         if (flags & 0x000000004)
  61                 DEBUGADD(lvl,("0x00000004 "));
  62         if (flags & 0x000000008)
  63                 DEBUGADD(lvl,("0x00000008 "));
  64         if (flags & DS_DIRECTORY_SERVICE_REQUIRED)
  65                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_REQUIRED "));
  66         if (flags & DS_DIRECTORY_SERVICE_PREFERRED)
  67                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_PREFERRED "));
  68         if (flags & DS_GC_SERVER_REQUIRED)
  69                 DEBUGADD(lvl,("DS_GC_SERVER_REQUIRED "));
  70         if (flags & DS_PDC_REQUIRED)
  71                 DEBUGADD(lvl,("DS_PDC_REQUIRED "));
  72         if (flags & DS_BACKGROUND_ONLY)
  73                 DEBUGADD(lvl,("DS_BACKGROUND_ONLY "));
  74         if (flags & DS_IP_REQUIRED)
  75                 DEBUGADD(lvl,("DS_IP_REQUIRED "));
  76         if (flags & DS_KDC_REQUIRED)
  77                 DEBUGADD(lvl,("DS_KDC_REQUIRED "));
  78         if (flags & DS_TIMESERV_REQUIRED)
  79                 DEBUGADD(lvl,("DS_TIMESERV_REQUIRED "));
  80         if (flags & DS_WRITABLE_REQUIRED)
  81                 DEBUGADD(lvl,("DS_WRITABLE_REQUIRED "));
  82         if (flags & DS_GOOD_TIMESERV_PREFERRED)
  83                 DEBUGADD(lvl,("DS_GOOD_TIMESERV_PREFERRED "));
  84         if (flags & DS_AVOID_SELF)
  85                 DEBUGADD(lvl,("DS_AVOID_SELF "));
  86         if (flags & DS_ONLY_LDAP_NEEDED)
  87                 DEBUGADD(lvl,("DS_ONLY_LDAP_NEEDED "));
  88         if (flags & DS_IS_FLAT_NAME)
  89                 DEBUGADD(lvl,("DS_IS_FLAT_NAME "));
  90         if (flags & DS_IS_DNS_NAME)
  91                 DEBUGADD(lvl,("DS_IS_DNS_NAME "));
  92         if (flags & DS_TRY_NEXTCLOSEST_SITE)
  93                 DEBUGADD(lvl,("DS_TRY_NEXTCLOSEST_SITE "));
  94         if (flags & DS_DIRECTORY_SERVICE_6_REQUIRED)
  95                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_6_REQUIRED "));
  96         if (flags & DS_WEB_SERVICE_REQUIRED)
  97                 DEBUGADD(lvl,("DS_WEB_SERVICE_REQUIRED "));
  98         if (flags & DS_DIRECTORY_SERVICE_8_REQUIRED)
  99                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_8_REQUIRED "));
 100         if (flags & DS_DIRECTORY_SERVICE_9_REQUIRED)
 101                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_9_REQUIRED "));
 102         if (flags & DS_DIRECTORY_SERVICE_10_REQUIRED)
 103                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_10_REQUIRED "));
 104         if (flags & 0x01000000)
 105                 DEBUGADD(lvl,("0x01000000 "));
 106         if (flags & 0x02000000)
 107                 DEBUGADD(lvl,("0x02000000 "));
 108         if (flags & 0x04000000)
 109                 DEBUGADD(lvl,("0x04000000 "));
 110         if (flags & 0x08000000)
 111                 DEBUGADD(lvl,("0x08000000 "));
 112         if (flags & 0x10000000)
 113                 DEBUGADD(lvl,("0x10000000 "));
 114         if (flags & 0x20000000)
 115                 DEBUGADD(lvl,("0x20000000 "));
 116         if (flags & DS_RETURN_DNS_NAME)
 117                 DEBUGADD(lvl,("DS_RETURN_DNS_NAME "));
 118         if (flags & DS_RETURN_FLAT_NAME)
 119                 DEBUGADD(lvl,("DS_RETURN_FLAT_NAME "));
 120         if (flags)
 121                 DEBUGADD(lvl,("\n"));
 122 }
 123
 124 /****************************************************************
 125 ****************************************************************/
 126
 127 static char *dsgetdcname_cache_key(TALLOC_CTX *mem_ctx, const char *domain)
 128 {
 129         if (!domain) {
 130                 return NULL;
 131         }
 132
 133         return talloc_asprintf_strupper_m(mem_ctx, "DSGETDCNAME/DOMAIN/%s",
 134                                           domain);
 135 }
 136
 137 /****************************************************************
 138 ****************************************************************/
 139
 140 static NTSTATUS dsgetdcname_cache_delete(TALLOC_CTX *mem_ctx,
 141                                         const char *domain_name)
 142 {
 143         char *key;
 144
 145         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 146         if (!key) {
 147                 return NT_STATUS_NO_MEMORY;
 148         }
 149
 150         if (!gencache_del(key)) {
 151                 return NT_STATUS_UNSUCCESSFUL;
 152         }
 153
 154         return NT_STATUS_OK;
 155 }
 156
 157 /****************************************************************
 158 ****************************************************************/
 159
 160 static NTSTATUS dsgetdcname_cache_store(TALLOC_CTX *mem_ctx,
 161                                         const char *domain_name,
 162                                         DATA_BLOB blob)
 163 {
 164         time_t expire_time;
 165         char *key;
 166         bool ret = false;
 167
 168         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 169         if (!key) {
 170                 return NT_STATUS_NO_MEMORY;
 171         }
 172
 173         expire_time = time(NULL) + DSGETDCNAME_CACHE_TTL;
 174
 175         ret = gencache_set_data_blob(key, blob, expire_time);
 176
 177         return ret ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
 178 }
 179
 180 /****************************************************************
 181 ****************************************************************/
 182
 183 static NTSTATUS store_cldap_reply(TALLOC_CTX *mem_ctx,
 184                                   uint32_t flags,
 185                                   struct samba_sockaddr *sa,
 186                                   uint32_t nt_version,
 187                                   struct NETLOGON_SAM_LOGON_RESPONSE_EX *r)
 188 {
 189         DATA_BLOB blob;
 190         enum ndr_err_code ndr_err;
 191         NTSTATUS status;
 192         char addr[INET6_ADDRSTRLEN];
 193
 194         print_sockaddr(addr, sizeof(addr), &sa->u.ss);
 195
 196         /* FIXME */
 197         r->sockaddr_size = 0x10; /* the w32 winsock addr size */
 198         r->sockaddr.sockaddr_family = 2; /* AF_INET */
 199         r->sockaddr.pdc_ip = talloc_strdup(mem_ctx, addr);
 200
 201         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, r,
 202                        (ndr_push_flags_fn_t)ndr_push_NETLOGON_SAM_LOGON_RESPONSE_EX);
 203         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 204                 return ndr_map_error2ntstatus(ndr_err);
 205         }
 206
 207         if (r->domain_name) {
 208                 status = dsgetdcname_cache_store(mem_ctx, r->domain_name,
 209                                                  blob);
 210                 if (!NT_STATUS_IS_OK(status)) {
 211                         goto done;
 212                 }
 213                 if (r->client_site) {
 214                         sitename_store(r->domain_name, r->client_site);
 215                 }
 216         }
 217         if (r->dns_domain) {
 218                 status = dsgetdcname_cache_store(mem_ctx, r->dns_domain, blob);
 219                 if (!NT_STATUS_IS_OK(status)) {
 220                         goto done;
 221                 }
 222                 if (r->client_site) {
 223                         sitename_store(r->dns_domain, r->client_site);
 224                 }
 225         }
 226
 227         status = NT_STATUS_OK;
 228
 229  done:
 230         data_blob_free(&blob);
 231
 232         return status;
 233 }
 234
 235 /****************************************************************
 236 ****************************************************************/
 237
 238 static uint32_t get_cldap_reply_server_flags(struct netlogon_samlogon_response *r,
 239                                              uint32_t nt_version)
 240 {
 241         switch (nt_version & 0x0000001f) {
 242                 case 0:
 243                 case 1:
 244                 case 16:
 245                 case 17:
 246                         return 0;
 247                 case 2:
 248                 case 3:
 249                 case 18:
 250                 case 19:
 251                         return r->data.nt5.server_type;
 252                 case 4:
 253                 case 5:
 254                 case 6:
 255                 case 7:
 256                         return r->data.nt5_ex.server_type;
 257                 case 8:
 258                 case 9:
 259                 case 10:
 260                 case 11:
 261                 case 12:
 262                 case 13:
 263                 case 14:
 264                 case 15:
 265                         return r->data.nt5_ex.server_type;
 266                 case 20:
 267                 case 21:
 268                 case 22:
 269                 case 23:
 270                 case 24:
 271                 case 25:
 272                 case 26:
 273                 case 27:
 274                 case 28:
 275                         return r->data.nt5_ex.server_type;
 276                 case 29:
 277                 case 30:
 278                 case 31:
 279                         return r->data.nt5_ex.server_type;
 280                 default:
 281                         return 0;
 282         }
 283 }
 284
 285 /****************************************************************
 286 ****************************************************************/
 287
 288 static NTSTATUS dsgetdcname_cache_fetch(TALLOC_CTX *mem_ctx,
 289                                         const char *domain_name,
 290                                         const struct GUID *domain_guid,
 291                                         uint32_t flags,
 292                                         struct netr_DsRGetDCNameInfo **info_p)
 293 {
 294         char *key;
 295         DATA_BLOB blob;
 296         enum ndr_err_code ndr_err;
 297         struct netr_DsRGetDCNameInfo *info;
 298         struct NETLOGON_SAM_LOGON_RESPONSE_EX r;
 299         NTSTATUS status;
 300
 301         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 302         if (!key) {
 303                 return NT_STATUS_NO_MEMORY;
 304         }
 305
 306         if (!gencache_get_data_blob(key, NULL, &blob, NULL, NULL)) {
 307                 return NT_STATUS_NOT_FOUND;
 308         }
 309
 310         info = talloc_zero(mem_ctx, struct netr_DsRGetDCNameInfo);
 311         if (!info) {
 312                 data_blob_free(&blob);
 313                 return NT_STATUS_NO_MEMORY;
 314         }
 315
 316         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &r,
 317                       (ndr_pull_flags_fn_t)ndr_pull_NETLOGON_SAM_LOGON_RESPONSE_EX);
 318
 319         data_blob_free(&blob);
 320         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 321                 dsgetdcname_cache_delete(mem_ctx, domain_name);
 322                 return ndr_map_error2ntstatus(ndr_err);
 323         }
 324
 325         status = make_dc_info_from_cldap_reply(mem_ctx, flags, NULL,
 326                                                &r, &info);
 327         if (!NT_STATUS_IS_OK(status)) {
 328                 return status;
 329         }
 330
 331         if (DEBUGLEVEL >= 10) {
 332                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, info);
 333         }
 334
 335         /* check flags */
 336         if (!check_cldap_reply_required_flags(info->dc_flags, flags)) {
 337                 DEBUG(10,("invalid flags\n"));
 338                 return NT_STATUS_INVALID_PARAMETER;
 339         }
 340
 341         if ((flags & DS_IP_REQUIRED) &&
 342             (info->dc_address_type != DS_ADDRESS_TYPE_INET)) {
 343                 return NT_STATUS_INVALID_PARAMETER_MIX;
 344         }
 345
 346         *info_p = info;
 347
 348         return NT_STATUS_OK;
 349 }
 350
 351 /****************************************************************
 352 ****************************************************************/
 353
 354 static NTSTATUS dsgetdcname_cached(TALLOC_CTX *mem_ctx,
 355                                    struct messaging_context *msg_ctx,
 356                                    const char *domain_name,
 357                                    const struct GUID *domain_guid,
 358                                    uint32_t flags,
 359                                    const char *site_name,
 360                                    struct netr_DsRGetDCNameInfo **info)
 361 {
 362         NTSTATUS status;
 363
 364         status = dsgetdcname_cache_fetch(mem_ctx, domain_name, domain_guid,
 365                                          flags, info);
 366         if (!NT_STATUS_IS_OK(status)
 367             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 368                 DEBUG(10,("dsgetdcname_cached: cache fetch failed with: %s\n",
 369                         nt_errstr(status)));
 370                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 371         }
 372
 373         if (flags & DS_BACKGROUND_ONLY) {
 374                 return status;
 375         }
 376
 377         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 378                 struct netr_DsRGetDCNameInfo *dc_info;
 379
 380                 status = dsgetdcname(mem_ctx, msg_ctx, domain_name,
 381                                      domain_guid, site_name,
 382                                      flags | DS_FORCE_REDISCOVERY,
 383                                      &dc_info);
 384
 385                 if (!NT_STATUS_IS_OK(status)) {
 386                         return status;
 387                 }
 388
 389                 *info = dc_info;
 390         }
 391
 392         return status;
 393 }
 394
 395 /****************************************************************
 396 ****************************************************************/
 397
 398 static bool check_allowed_required_flags(uint32_t flags,
 399                                          const char *site_name)
 400 {
 401         uint32_t return_type = flags & (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME);
 402         uint32_t offered_type = flags & (DS_IS_FLAT_NAME|DS_IS_DNS_NAME);
 403         uint32_t query_type = flags & (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY);
 404
 405         /* FIXME: check for DSGETDC_VALID_FLAGS and check for excluse bits
 406          * (DS_PDC_REQUIRED, DS_KDC_REQUIRED, DS_GC_SERVER_REQUIRED) */
 407
 408         debug_dsdcinfo_flags(10, flags);
 409
 410         if ((flags & DS_TRY_NEXTCLOSEST_SITE) && site_name) {
 411                 return false;
 412         }
 413
 414         if (return_type == (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME)) {
 415                 return false;
 416         }
 417
 418         if (offered_type == (DS_IS_DNS_NAME|DS_IS_FLAT_NAME)) {
 419                 return false;
 420         }
 421
 422         if (query_type == (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY)) {
 423                 return false;
 424         }
 425
 426 #if 0
 427         if ((flags & DS_RETURN_DNS_NAME) && (!(flags & DS_IP_REQUIRED))) {
 428                 printf("gd: here5 \n");
 429                 return false;
 430         }
 431 #endif
 432         return true;
 433 }
 434
 435 /****************************************************************
 436 ****************************************************************/
 437
 438 static NTSTATUS discover_dc_netbios(TALLOC_CTX *mem_ctx,
 439                                     const char *domain_name,
 440                                     uint32_t flags,
 441                                     struct ip_service_name **returned_dclist,
 442                                     size_t *returned_count)
 443 {
 444         NTSTATUS status;
 445         enum nbt_name_type name_type = NBT_NAME_LOGON;
 446         struct samba_sockaddr *salist = NULL;
 447         size_t i;
 448         struct ip_service_name *dclist = NULL;
 449         size_t count = 0;
 450         static const char *resolve_order[] = { "lmhosts", "wins", "bcast", NULL };
 451
 452         if (flags & DS_PDC_REQUIRED) {
 453                 name_type = NBT_NAME_PDC;
 454         }
 455
 456         status = internal_resolve_name(mem_ctx,
 457                                         domain_name,
 458                                         name_type,
 459                                         NULL,
 460                                         &salist,
 461                                         &count,
 462                                         resolve_order);
 463         if (!NT_STATUS_IS_OK(status)) {
 464                 DEBUG(10,("discover_dc_netbios: failed to find DC\n"));
 465                 return status;
 466         }
 467
 468         dclist = talloc_zero_array(mem_ctx, struct ip_service_name, count);
 469         if (!dclist) {
 470                 TALLOC_FREE(salist);
 471                 return NT_STATUS_NO_MEMORY;
 472         }
 473
 474         for (i=0; i<count; i++) {
 475                 char addr[INET6_ADDRSTRLEN];
 476                 struct ip_service_name *r = &dclist[i];
 477
 478                 print_sockaddr(addr, sizeof(addr),
 479                                &salist[i].u.ss);
 480
 481                 r->sa = salist[i];
 482                 r->hostname = talloc_strdup(mem_ctx, addr);
 483                 if (!r->hostname) {
 484                         TALLOC_FREE(salist);
 485                         TALLOC_FREE(dclist);
 486                         return NT_STATUS_NO_MEMORY;
 487                 }
 488
 489         }
 490
 491         TALLOC_FREE(salist);
 492
 493         *returned_dclist = dclist;
 494         *returned_count = count;
 495
 496         return NT_STATUS_OK;
 497 }
 498
 499 /****************************************************************
 500 ****************************************************************/
 501
 502 static NTSTATUS discover_dc_dns(TALLOC_CTX *mem_ctx,
 503                                 const char *domain_name,
 504                                 const struct GUID *domain_guid,
 505                                 uint32_t flags,
 506                                 const char *site_name,
 507                                 struct ip_service_name **returned_dclist,
 508                                 size_t *return_count)
 509 {
 510         size_t i;
 511         NTSTATUS status;
 512         struct dns_rr_srv *dcs = NULL;
 513         size_t numdcs = 0;
 514         struct ip_service_name *dclist = NULL;
 515         size_t ret_count = 0;
 516         char *query = NULL;
 517
 518         if (flags & DS_PDC_REQUIRED) {
 519                 query = ads_dns_query_string_pdc(mem_ctx, domain_name);
 520         } else if (flags & DS_GC_SERVER_REQUIRED) {
 521                 query = ads_dns_query_string_gcs(mem_ctx, domain_name);
 522         } else if (flags & DS_KDC_REQUIRED) {
 523                 query = ads_dns_query_string_kdcs(mem_ctx, domain_name);
 524         } else if (flags & DS_DIRECTORY_SERVICE_REQUIRED) {
 525                 query = ads_dns_query_string_dcs(mem_ctx, domain_name);
 526         } else if (domain_guid) {
 527                 query = ads_dns_query_string_dcs_guid(
 528                         mem_ctx, domain_guid, domain_name);
 529         } else {
 530                 query = ads_dns_query_string_dcs(mem_ctx, domain_name);
 531         }
 532
 533         if (query == NULL) {
 534                 return NT_STATUS_NO_MEMORY;
 535         }
 536
 537         status = ads_dns_query_srv(
 538                 mem_ctx,
 539                 lp_get_async_dns_timeout(),
 540                 site_name,
 541                 query,
 542                 &dcs,
 543                 &numdcs);
 544         TALLOC_FREE(query);
 545         if (!NT_STATUS_IS_OK(status)) {
 546                 return status;
 547         }
 548
 549         if (numdcs == 0) {
 550                 TALLOC_FREE(dcs);
 551                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 552         }
 553
 554         /*
 555          * We're only returning one address per
 556          * DC name, so just allocate size numdcs.
 557          */
 558
 559         dclist = talloc_zero_array(mem_ctx,
 560                                    struct ip_service_name,
 561                                    numdcs);
 562         if (!dclist) {
 563                 TALLOC_FREE(dcs);
 564                 return NT_STATUS_NO_MEMORY;
 565         }
 566
 567         /*
 568          * First, copy the SRV record replies that
 569          * have IP addresses returned with them.
 570          */
 571         ret_count = 0;
 572         for (i = 0; i < numdcs; i++) {
 573                 size_t j;
 574
 575                 if (dcs[i].num_ips == 0) {
 576                         continue;
 577                 }
 578
 579                 dclist[ret_count].hostname =
 580                         talloc_move(dclist, &dcs[i].hostname);
 581
 582                 /*
 583                  * Pick the first IPv4 address,
 584                  * if none pick the first address.
 585                  *
 586                  * This is different from the previous
 587                  * code which picked a 'next ip' address
 588                  * each time, incrementing an index.
 589                  * Too complex to maintain :-(.
 590                  */
 591                 for (j = 0; j < dcs[i].num_ips; j++) {
 592                         if (dcs[i].ss_s[j].ss_family == AF_INET) {
 593                                 bool ok;
 594                                 ok = sockaddr_storage_to_samba_sockaddr(
 595                                         &dclist[ret_count].sa,
 596                                         &dcs[i].ss_s[j]);
 597                                 if (!ok) {
 598                                         TALLOC_FREE(dcs);
 599                                         TALLOC_FREE(dclist);
 600                                         return NT_STATUS_INVALID_PARAMETER;
 601                                 }
 602                                 break;
 603                         }
 604                 }
 605                 if (j == dcs[i].num_ips) {
 606                         /* No IPv4- use the first IPv6 addr. */
 607                         bool ok;
 608                         ok = sockaddr_storage_to_samba_sockaddr(
 609                                         &dclist[ret_count].sa,
 610                                         &dcs[i].ss_s[0]);
 611                         if (!ok) {
 612                                 TALLOC_FREE(dcs);
 613                                 TALLOC_FREE(dclist);
 614                                 return NT_STATUS_INVALID_PARAMETER;
 615                         }
 616                 }
 617                 ret_count++;
 618         }
 619
 620         TALLOC_FREE(dcs);
 621
 622         if (ret_count == 0) {
 623                 TALLOC_FREE(dclist);
 624                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 625         }
 626
 627         *returned_dclist = dclist;
 628         *return_count = ret_count;
 629         return NT_STATUS_OK;
 630 }
 631
 632 /****************************************************************
 633 ****************************************************************/
 634
 635 static NTSTATUS make_domain_controller_info(TALLOC_CTX *mem_ctx,
 636                                             const char *dc_unc,
 637                                             const char *dc_address,
 638                                             uint32_t dc_address_type,
 639                                             const struct GUID *domain_guid,
 640                                             const char *domain_name,
 641                                             const char *forest_name,
 642                                             uint32_t flags,
 643                                             const char *dc_site_name,
 644                                             const char *client_site_name,
 645                                             struct netr_DsRGetDCNameInfo **info_out)
 646 {
 647         struct netr_DsRGetDCNameInfo *info;
 648
 649         info = talloc_zero(mem_ctx, struct netr_DsRGetDCNameInfo);
 650         NT_STATUS_HAVE_NO_MEMORY(info);
 651
 652         if (dc_unc) {
 653                 if (!(dc_unc[0] == '\\' && dc_unc[1] == '\\')) {
 654                         info->dc_unc = talloc_asprintf(mem_ctx, "\\\\%s",
 655                                                        dc_unc);
 656                 } else {
 657                         info->dc_unc = talloc_strdup(mem_ctx, dc_unc);
 658                 }
 659                 NT_STATUS_HAVE_NO_MEMORY(info->dc_unc);
 660         }
 661
 662         if (dc_address) {
 663                 if (!(dc_address[0] == '\\' && dc_address[1] == '\\')) {
 664                         info->dc_address = talloc_asprintf(mem_ctx, "\\\\%s",
 665                                                            dc_address);
 666                 } else {
 667                         info->dc_address = talloc_strdup(mem_ctx, dc_address);
 668                 }
 669                 NT_STATUS_HAVE_NO_MEMORY(info->dc_address);
 670         }
 671
 672         info->dc_address_type = dc_address_type;
 673
 674         if (domain_guid) {
 675                 info->domain_guid = *domain_guid;
 676         }
 677
 678         if (domain_name) {
 679                 info->domain_name = talloc_strdup(mem_ctx, domain_name);
 680                 NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
 681         }
 682
 683         if (forest_name && *forest_name) {
 684                 info->forest_name = talloc_strdup(mem_ctx, forest_name);
 685                 NT_STATUS_HAVE_NO_MEMORY(info->forest_name);
 686                 flags |= DS_DNS_FOREST_ROOT;
 687         }
 688
 689         info->dc_flags = flags;
 690
 691         if (dc_site_name) {
 692                 info->dc_site_name = talloc_strdup(mem_ctx, dc_site_name);
 693                 NT_STATUS_HAVE_NO_MEMORY(info->dc_site_name);
 694         }
 695
 696         if (client_site_name) {
 697                 info->client_site_name = talloc_strdup(mem_ctx,
 698                                                        client_site_name);
 699                 NT_STATUS_HAVE_NO_MEMORY(info->client_site_name);
 700         }
 701
 702         *info_out = info;
 703
 704         return NT_STATUS_OK;
 705 }
 706
 707 /****************************************************************
 708 ****************************************************************/
 709
 710 static void map_dc_and_domain_names(uint32_t flags,
 711                                     const char *dc_name,
 712                                     const char *domain_name,
 713                                     const char *dns_dc_name,
 714                                     const char *dns_domain_name,
 715                                     uint32_t *dc_flags,
 716                                     const char **hostname_p,
 717                                     const char **domain_p)
 718 {
 719         switch (flags & 0xf0000000) {
 720                 case DS_RETURN_FLAT_NAME:
 721                         if (dc_name && domain_name &&
 722                             *dc_name && *domain_name) {
 723                                 *hostname_p = dc_name;
 724                                 *domain_p = domain_name;
 725                                 break;
 726                         }
 727
 728                         FALL_THROUGH;
 729                 case DS_RETURN_DNS_NAME:
 730                 default:
 731                         if (dns_dc_name && dns_domain_name &&
 732                             *dns_dc_name && *dns_domain_name) {
 733                                 *hostname_p = dns_dc_name;
 734                                 *domain_p = dns_domain_name;
 735                                 *dc_flags |= DS_DNS_DOMAIN | DS_DNS_CONTROLLER;
 736                                 break;
 737                         }
 738                         if (dc_name && domain_name &&
 739                             *dc_name && *domain_name) {
 740                                 *hostname_p = dc_name;
 741                                 *domain_p = domain_name;
 742                                 break;
 743                         }
 744         }
 745 }
 746
 747 /****************************************************************
 748 ****************************************************************/
 749
 750 static NTSTATUS make_dc_info_from_cldap_reply(
 751         TALLOC_CTX *mem_ctx,
 752         uint32_t flags,
 753         const struct samba_sockaddr *sa,
 754         struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
 755         struct netr_DsRGetDCNameInfo **info)
 756 {
 757         const char *dc_hostname = NULL;
 758         const char *dc_domain_name = NULL;
 759         const char *dc_address = NULL;
 760         const char *dc_forest = NULL;
 761         uint32_t dc_address_type = 0;
 762         uint32_t dc_flags = 0;
 763         struct GUID *dc_domain_guid = NULL;
 764         const char *dc_server_site = NULL;
 765         const char *dc_client_site = NULL;
 766
 767         char addr[INET6_ADDRSTRLEN];
 768
 769         if (sa != NULL) {
 770                 print_sockaddr(addr, sizeof(addr), &sa->u.ss);
 771                 dc_address = addr;
 772                 dc_address_type = DS_ADDRESS_TYPE_INET;
 773         } else {
 774                 if (r->sockaddr.pdc_ip) {
 775                         dc_address      = r->sockaddr.pdc_ip;
 776                         dc_address_type = DS_ADDRESS_TYPE_INET;
 777                 } else {
 778                         dc_address      = r->pdc_name;
 779                         dc_address_type = DS_ADDRESS_TYPE_NETBIOS;
 780                 }
 781         }
 782
 783         map_dc_and_domain_names(flags,
 784                                 r->pdc_name,
 785                                 r->domain_name,
 786                                 r->pdc_dns_name,
 787                                 r->dns_domain,
 788                                 &dc_flags,
 789                                 &dc_hostname,
 790                                 &dc_domain_name);
 791
 792         dc_flags        |= r->server_type;
 793         dc_forest       = r->forest;
 794         dc_domain_guid  = &r->domain_uuid;
 795         dc_server_site  = r->server_site;
 796         dc_client_site  = r->client_site;
 797
 798         return make_domain_controller_info(mem_ctx,
 799                                            dc_hostname,
 800                                            dc_address,
 801                                            dc_address_type,
 802                                            dc_domain_guid,
 803                                            dc_domain_name,
 804                                            dc_forest,
 805                                            dc_flags,
 806                                            dc_server_site,
 807                                            dc_client_site,
 808                                            info);
 809 }
 810
 811 /****************************************************************
 812 ****************************************************************/
 813
 814 static uint32_t map_ds_flags_to_nt_version(uint32_t flags)
 815 {
 816         uint32_t nt_version = 0;
 817
 818         if (flags & DS_PDC_REQUIRED) {
 819                 nt_version |= NETLOGON_NT_VERSION_PDC;
 820         }
 821
 822         if (flags & DS_GC_SERVER_REQUIRED) {
 823                 nt_version |= NETLOGON_NT_VERSION_GC;
 824         }
 825
 826         if (flags & DS_TRY_NEXTCLOSEST_SITE) {
 827                 nt_version |= NETLOGON_NT_VERSION_WITH_CLOSEST_SITE;
 828         }
 829
 830         if (flags & DS_IP_REQUIRED) {
 831                 nt_version |= NETLOGON_NT_VERSION_IP;
 832         }
 833
 834         return nt_version;
 835 }
 836
 837 /****************************************************************
 838 ****************************************************************/
 839
 840 static NTSTATUS process_dc_dns(TALLOC_CTX *mem_ctx,
 841                                const char *domain_name,
 842                                uint32_t flags,
 843                                struct ip_service_name *dclist,
 844                                size_t num_dcs,
 845                                struct netr_DsRGetDCNameInfo **info)
 846 {
 847         size_t i = 0;
 848         bool valid_dc = false;
 849         struct netlogon_samlogon_response *r = NULL;
 850         uint32_t nt_version = NETLOGON_NT_VERSION_5 |
 851                               NETLOGON_NT_VERSION_5EX;
 852         uint32_t ret_flags = 0;
 853         NTSTATUS status;
 854
 855         nt_version |= map_ds_flags_to_nt_version(flags);
 856
 857         for (i=0; i<num_dcs; i++) {
 858                 char addr[INET6_ADDRSTRLEN];
 859
 860                 print_sockaddr(addr, sizeof(addr), &dclist[i].sa.u.ss);
 861
 862                 DEBUG(10,("LDAP ping to %s (%s)\n", dclist[i].hostname, addr));
 863
 864                 if (ads_cldap_netlogon(mem_ctx, &dclist[i].sa.u.ss,
 865                                         domain_name,
 866                                         nt_version,
 867                                         &r))
 868                 {
 869                         nt_version = r->ntver;
 870                         ret_flags = get_cldap_reply_server_flags(r, nt_version);
 871
 872                         if (check_cldap_reply_required_flags(ret_flags, flags)) {
 873                                 valid_dc = true;
 874                                 break;
 875                         }
 876                 }
 877
 878                 continue;
 879         }
 880
 881         if (!valid_dc) {
 882                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 883         }
 884
 885         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].sa,
 886                                                &r->data.nt5_ex, info);
 887         if (NT_STATUS_IS_OK(status)) {
 888                 return store_cldap_reply(mem_ctx, flags, &dclist[i].sa,
 889                                          nt_version, &r->data.nt5_ex);
 890         }
 891
 892         return status;
 893 }
 894
 895 /****************************************************************
 896 ****************************************************************/
 897
 898 /****************************************************************
 899 ****************************************************************/
 900
 901 static NTSTATUS process_dc_netbios(TALLOC_CTX *mem_ctx,
 902                                    struct messaging_context *msg_ctx,
 903                                    const char *domain_name,
 904                                    uint32_t flags,
 905                                    struct ip_service_name *dclist,
 906                                    size_t num_dcs,
 907                                    struct netr_DsRGetDCNameInfo **info)
 908 {
 909         enum nbt_name_type name_type = NBT_NAME_LOGON;
 910         NTSTATUS status;
 911         size_t i;
 912         const char *dc_name = NULL;
 913         fstring tmp_dc_name;
 914         struct netlogon_samlogon_response *r = NULL;
 915         bool store_cache = false;
 916         uint32_t nt_version = NETLOGON_NT_VERSION_1 |
 917                               NETLOGON_NT_VERSION_5 |
 918                               NETLOGON_NT_VERSION_5EX_WITH_IP;
 919         size_t len = strlen(lp_netbios_name());
 920         char my_acct_name[len+2];
 921
 922         if (msg_ctx == NULL) {
 923                 return NT_STATUS_INVALID_PARAMETER;
 924         }
 925
 926         if (flags & DS_PDC_REQUIRED) {
 927                 name_type = NBT_NAME_PDC;
 928         }
 929
 930         nt_version |= map_ds_flags_to_nt_version(flags);
 931
 932         snprintf(my_acct_name,
 933                  sizeof(my_acct_name),
 934                  "%s$",
 935                  lp_netbios_name());
 936
 937         DEBUG(10,("process_dc_netbios\n"));
 938
 939         for (i=0; i<num_dcs; i++) {
 940                 uint16_t val;
 941
 942                 generate_random_buffer((uint8_t *)&val, 2);
 943
 944                 status = nbt_getdc(msg_ctx, 10, &dclist[i].sa.u.ss, domain_name,
 945                                    NULL, my_acct_name, ACB_WSTRUST, nt_version,
 946                                    mem_ctx, &nt_version, &dc_name, &r);
 947                 if (NT_STATUS_IS_OK(status)) {
 948                         store_cache = true;
 949                         namecache_store(dc_name,
 950                                         NBT_NAME_SERVER,
 951                                         1,
 952                                         &dclist[i].sa);
 953                         goto make_reply;
 954                 }
 955
 956                 if (name_status_find(domain_name,
 957                                      name_type,
 958                                      NBT_NAME_SERVER,
 959                                      &dclist[i].sa.u.ss,
 960                                      tmp_dc_name))
 961                 {
 962                         struct NETLOGON_SAM_LOGON_RESPONSE_NT40 logon1;
 963
 964                         r = talloc_zero(mem_ctx, struct netlogon_samlogon_response);
 965                         NT_STATUS_HAVE_NO_MEMORY(r);
 966
 967                         ZERO_STRUCT(logon1);
 968
 969                         nt_version = NETLOGON_NT_VERSION_1;
 970
 971                         logon1.nt_version = nt_version;
 972                         logon1.pdc_name = tmp_dc_name;
 973                         logon1.domain_name = talloc_strdup_upper(mem_ctx, domain_name);
 974                         NT_STATUS_HAVE_NO_MEMORY(logon1.domain_name);
 975
 976                         r->data.nt4 = logon1;
 977                         r->ntver = nt_version;
 978
 979                         map_netlogon_samlogon_response(r);
 980
 981                         namecache_store(tmp_dc_name,
 982                                         NBT_NAME_SERVER,
 983                                         1,
 984                                         &dclist[i].sa);
 985
 986                         goto make_reply;
 987                 }
 988         }
 989
 990         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 991
 992  make_reply:
 993
 994         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].sa,
 995                                                &r->data.nt5_ex, info);
 996         if (NT_STATUS_IS_OK(status) && store_cache) {
 997                 return store_cldap_reply(mem_ctx, flags, &dclist[i].sa,
 998                                          nt_version, &r->data.nt5_ex);
 999         }
1000
1001         return status;
1002 }
1003
1004 /****************************************************************
1005 ****************************************************************/
1006
1007 static NTSTATUS dsgetdcname_rediscover(TALLOC_CTX *mem_ctx,
1008                                        struct messaging_context *msg_ctx,
1009                                        const char *domain_name,
1010                                        const struct GUID *domain_guid,
1011                                        uint32_t flags,
1012                                        const char *site_name,
1013                                        struct netr_DsRGetDCNameInfo **info)
1014 {
1015         NTSTATUS status;
1016         struct ip_service_name *dclist = NULL;
1017         size_t num_dcs = 0;
1018
1019         DEBUG(10,("dsgetdcname_rediscover\n"));
1020
1021         if (flags & DS_IS_FLAT_NAME) {
1022
1023                 if (lp_disable_netbios()) {
1024                         return NT_STATUS_NOT_SUPPORTED;
1025                 }
1026
1027                 status = discover_dc_netbios(mem_ctx, domain_name, flags,
1028                                              &dclist, &num_dcs);
1029                 NT_STATUS_NOT_OK_RETURN(status);
1030
1031                 return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags,
1032                                           dclist, num_dcs, info);
1033         }
1034
1035         if (flags & DS_IS_DNS_NAME) {
1036
1037                 status = discover_dc_dns(mem_ctx, domain_name, domain_guid,
1038                                          flags, site_name, &dclist, &num_dcs);
1039                 NT_STATUS_NOT_OK_RETURN(status);
1040
1041                 return process_dc_dns(mem_ctx, domain_name, flags,
1042                                       dclist, num_dcs, info);
1043         }
1044
1045         status = discover_dc_dns(mem_ctx, domain_name, domain_guid, flags,
1046                                  site_name, &dclist, &num_dcs);
1047
1048         if (NT_STATUS_IS_OK(status) && num_dcs != 0) {
1049
1050                 status = process_dc_dns(mem_ctx, domain_name, flags, dclist,
1051                                         num_dcs, info);
1052                 if (NT_STATUS_IS_OK(status)) {
1053                         return status;
1054                 }
1055         }
1056
1057         if (lp_disable_netbios()) {
1058                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1059         }
1060
1061         status = discover_dc_netbios(mem_ctx, domain_name, flags, &dclist,
1062                                      &num_dcs);
1063         NT_STATUS_NOT_OK_RETURN(status);
1064
1065         return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags, dclist,
1066                                   num_dcs, info);
1067 }
1068
1069 static bool is_closest_site(struct netr_DsRGetDCNameInfo *info)
1070 {
1071         if (info->dc_flags & DS_SERVER_CLOSEST) {
1072                 return true;
1073         }
1074
1075         if (!info->client_site_name) {
1076                 return true;
1077         }
1078
1079         if (!info->dc_site_name) {
1080                 return false;
1081         }
1082
1083         if (strcmp(info->client_site_name, info->dc_site_name) == 0) {
1084                 return true;
1085         }
1086
1087         return false;
1088 }
1089
1090 /********************************************************************
1091  Internal dsgetdcname.
1092 ********************************************************************/
1093
1094 static NTSTATUS dsgetdcname_internal(TALLOC_CTX *mem_ctx,
1095                      struct messaging_context *msg_ctx,
1096                      const char *domain_name,
1097                      const struct GUID *domain_guid,
1098                      const char *site_name,
1099                      uint32_t flags,
1100                      struct netr_DsRGetDCNameInfo **info)
1101 {
1102         NTSTATUS status;
1103         struct netr_DsRGetDCNameInfo *myinfo = NULL;
1104         bool first = true;
1105         struct netr_DsRGetDCNameInfo *first_info = NULL;
1106
1107         DEBUG(10,("dsgetdcname_internal: domain_name: %s, "
1108                   "domain_guid: %s, site_name: %s, flags: 0x%08x\n",
1109                   domain_name,
1110                   domain_guid ? GUID_string(mem_ctx, domain_guid) : "(null)",
1111                   site_name ? site_name : "(null)", flags));
1112
1113         *info = NULL;
1114
1115         if (!check_allowed_required_flags(flags, site_name)) {
1116                 DEBUG(0,("invalid flags specified\n"));
1117                 return NT_STATUS_INVALID_PARAMETER;
1118         }
1119
1120         if (flags & DS_FORCE_REDISCOVERY) {
1121                 goto rediscover;
1122         }
1123
1124         status = dsgetdcname_cached(mem_ctx, msg_ctx, domain_name, domain_guid,
1125                                     flags, site_name, &myinfo);
1126         if (NT_STATUS_IS_OK(status)) {
1127                 *info = myinfo;
1128                 goto done;
1129         }
1130
1131         if (flags & DS_BACKGROUND_ONLY) {
1132                 goto done;
1133         }
1134
1135  rediscover:
1136         status = dsgetdcname_rediscover(mem_ctx, msg_ctx, domain_name,
1137                                         domain_guid, flags, site_name,
1138                                         &myinfo);
1139
1140  done:
1141         if (!NT_STATUS_IS_OK(status)) {
1142                 if (!first) {
1143                         *info = first_info;
1144                         return NT_STATUS_OK;
1145                 }
1146                 return status;
1147         }
1148
1149         if (!first) {
1150                 TALLOC_FREE(first_info);
1151         } else if (!is_closest_site(myinfo)) {
1152                 first = false;
1153                 first_info = myinfo;
1154                 /* TODO: may use the next_closest_site here */
1155                 site_name = myinfo->client_site_name;
1156                 goto rediscover;
1157         }
1158
1159         *info = myinfo;
1160         return NT_STATUS_OK;
1161 }
1162
1163 /********************************************************************
1164  dsgetdcname.
1165
1166  This will be the only public function here.
1167 ********************************************************************/
1168
1169 NTSTATUS dsgetdcname(TALLOC_CTX *mem_ctx,
1170                      struct messaging_context *msg_ctx,
1171                      const char *domain_name,
1172                      const struct GUID *domain_guid,
1173                      const char *site_name,
1174                      uint32_t flags,
1175                      struct netr_DsRGetDCNameInfo **info)
1176 {
1177         NTSTATUS status;
1178         const char *query_site = NULL;
1179         char *ptr_to_free = NULL;
1180         bool retry_query_with_null = false;
1181
1182         if ((site_name == NULL) || (site_name[0] == '\0')) {
1183                 ptr_to_free = sitename_fetch(mem_ctx, domain_name);
1184                 if (ptr_to_free != NULL) {
1185                         retry_query_with_null = true;
1186                 }
1187                 query_site = ptr_to_free;
1188         } else {
1189                 query_site = site_name;
1190         }
1191
1192         status = dsgetdcname_internal(mem_ctx,
1193                                 msg_ctx,
1194                                 domain_name,
1195                                 domain_guid,
1196                                 query_site,
1197                                 flags,
1198                                 info);
1199
1200         TALLOC_FREE(ptr_to_free);
1201
1202         if (!NT_STATUS_EQUAL(status, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND)) {
1203                 return status;
1204         }
1205
1206         /* Should we try again with site_name == NULL ? */
1207         if (retry_query_with_null) {
1208                 status = dsgetdcname_internal(mem_ctx,
1209                                         msg_ctx,
1210                                         domain_name,
1211                                         domain_guid,
1212                                         NULL,
1213                                         flags,
1214                                         info);
1215         }
1216
1217         return status;
1218 }
1219
1220 NTSTATUS dsgetonedcname(TALLOC_CTX *mem_ctx,
1221                         struct messaging_context *msg_ctx,
1222                         const char *domain_name,
1223                         const char *dcname,
1224                         uint32_t flags,
1225                         struct netr_DsRGetDCNameInfo **info)
1226 {
1227         NTSTATUS status;
1228         struct sockaddr_storage *addrs;
1229         unsigned int num_addrs, i;
1230         const char *hostname = strip_hostname(dcname);
1231
1232         status = resolve_name_list(mem_ctx, hostname, 0x20,
1233                                    &addrs, &num_addrs);
1234         if (!NT_STATUS_IS_OK(status)) {
1235                 return status;
1236         }
1237
1238         for (i = 0; i < num_addrs; i++) {
1239
1240                 bool ok;
1241                 struct ip_service_name dclist;
1242
1243                 dclist.hostname = hostname;
1244                 ok = sockaddr_storage_to_samba_sockaddr(&dclist.sa, &addrs[i]);
1245                 if (!ok) {
1246                         TALLOC_FREE(addrs);
1247                         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1248                 }
1249
1250                 status = process_dc_dns(mem_ctx, domain_name, flags,
1251                                         &dclist, 1, info);
1252                 if (NT_STATUS_IS_OK(status)) {
1253                         TALLOC_FREE(addrs);
1254                         return NT_STATUS_OK;
1255                 }
1256
1257                 if (lp_disable_netbios()) {
1258                         continue;
1259                 }
1260
1261                 status = process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags,
1262                                             &dclist, 1, info);
1263                 if (NT_STATUS_IS_OK(status)) {
1264                         TALLOC_FREE(addrs);
1265                         return NT_STATUS_OK;
1266                 }
1267         }
1268
1269         TALLOC_FREE(addrs);
1270         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1271 }