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 #include "../librpc/gen_ndr/ndr_netlogon.h"
  26 #include "libads/cldap.h"
  27 #include "../lib/addns/dnsquery.h"
  28 #include "libsmb/clidgram.h"
  29
  30 /* 15 minutes */
  31 #define DSGETDCNAME_CACHE_TTL   60*15
  32
  33 struct ip_service_name {
  34         struct sockaddr_storage ss;
  35         const char *hostname;
  36 };
  37
  38 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
  39                                               uint32_t flags,
  40                                               struct sockaddr_storage *ss,
  41                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
  42                                               struct netr_DsRGetDCNameInfo **info);
  43
  44 /****************************************************************
  45 ****************************************************************/
  46
  47 static void debug_dsdcinfo_flags(int lvl, uint32_t flags)
  48 {
  49         DEBUG(lvl,("debug_dsdcinfo_flags: 0x%08x\n\t", flags));
  50
  51         if (flags & DS_FORCE_REDISCOVERY)
  52                 DEBUGADD(lvl,("DS_FORCE_REDISCOVERY "));
  53         if (flags & 0x000000002)
  54                 DEBUGADD(lvl,("0x00000002 "));
  55         if (flags & 0x000000004)
  56                 DEBUGADD(lvl,("0x00000004 "));
  57         if (flags & 0x000000008)
  58                 DEBUGADD(lvl,("0x00000008 "));
  59         if (flags & DS_DIRECTORY_SERVICE_REQUIRED)
  60                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_REQUIRED "));
  61         if (flags & DS_DIRECTORY_SERVICE_PREFERRED)
  62                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_PREFERRED "));
  63         if (flags & DS_GC_SERVER_REQUIRED)
  64                 DEBUGADD(lvl,("DS_GC_SERVER_REQUIRED "));
  65         if (flags & DS_PDC_REQUIRED)
  66                 DEBUGADD(lvl,("DS_PDC_REQUIRED "));
  67         if (flags & DS_BACKGROUND_ONLY)
  68                 DEBUGADD(lvl,("DS_BACKGROUND_ONLY "));
  69         if (flags & DS_IP_REQUIRED)
  70                 DEBUGADD(lvl,("DS_IP_REQUIRED "));
  71         if (flags & DS_KDC_REQUIRED)
  72                 DEBUGADD(lvl,("DS_KDC_REQUIRED "));
  73         if (flags & DS_TIMESERV_REQUIRED)
  74                 DEBUGADD(lvl,("DS_TIMESERV_REQUIRED "));
  75         if (flags & DS_WRITABLE_REQUIRED)
  76                 DEBUGADD(lvl,("DS_WRITABLE_REQUIRED "));
  77         if (flags & DS_GOOD_TIMESERV_PREFERRED)
  78                 DEBUGADD(lvl,("DS_GOOD_TIMESERV_PREFERRED "));
  79         if (flags & DS_AVOID_SELF)
  80                 DEBUGADD(lvl,("DS_AVOID_SELF "));
  81         if (flags & DS_ONLY_LDAP_NEEDED)
  82                 DEBUGADD(lvl,("DS_ONLY_LDAP_NEEDED "));
  83         if (flags & DS_IS_FLAT_NAME)
  84                 DEBUGADD(lvl,("DS_IS_FLAT_NAME "));
  85         if (flags & DS_IS_DNS_NAME)
  86                 DEBUGADD(lvl,("DS_IS_DNS_NAME "));
  87         if (flags & 0x00040000)
  88                 DEBUGADD(lvl,("0x00040000 "));
  89         if (flags & 0x00080000)
  90                 DEBUGADD(lvl,("0x00080000 "));
  91         if (flags & 0x00100000)
  92                 DEBUGADD(lvl,("0x00100000 "));
  93         if (flags & 0x00200000)
  94                 DEBUGADD(lvl,("0x00200000 "));
  95         if (flags & 0x00400000)
  96                 DEBUGADD(lvl,("0x00400000 "));
  97         if (flags & 0x00800000)
  98                 DEBUGADD(lvl,("0x00800000 "));
  99         if (flags & 0x01000000)
 100                 DEBUGADD(lvl,("0x01000000 "));
 101         if (flags & 0x02000000)
 102                 DEBUGADD(lvl,("0x02000000 "));
 103         if (flags & 0x04000000)
 104                 DEBUGADD(lvl,("0x04000000 "));
 105         if (flags & 0x08000000)
 106                 DEBUGADD(lvl,("0x08000000 "));
 107         if (flags & 0x10000000)
 108                 DEBUGADD(lvl,("0x10000000 "));
 109         if (flags & 0x20000000)
 110                 DEBUGADD(lvl,("0x20000000 "));
 111         if (flags & DS_RETURN_DNS_NAME)
 112                 DEBUGADD(lvl,("DS_RETURN_DNS_NAME "));
 113         if (flags & DS_RETURN_FLAT_NAME)
 114                 DEBUGADD(lvl,("DS_RETURN_FLAT_NAME "));
 115         if (flags)
 116                 DEBUGADD(lvl,("\n"));
 117 }
 118
 119 /****************************************************************
 120 ****************************************************************/
 121
 122 static char *dsgetdcname_cache_key(TALLOC_CTX *mem_ctx, const char *domain)
 123 {
 124         if (!domain) {
 125                 return NULL;
 126         }
 127
 128         return talloc_asprintf_strupper_m(mem_ctx, "DSGETDCNAME/DOMAIN/%s",
 129                                           domain);
 130 }
 131
 132 /****************************************************************
 133 ****************************************************************/
 134
 135 static NTSTATUS dsgetdcname_cache_delete(TALLOC_CTX *mem_ctx,
 136                                         const char *domain_name)
 137 {
 138         char *key;
 139
 140         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 141         if (!key) {
 142                 return NT_STATUS_NO_MEMORY;
 143         }
 144
 145         if (!gencache_del(key)) {
 146                 return NT_STATUS_UNSUCCESSFUL;
 147         }
 148
 149         return NT_STATUS_OK;
 150 }
 151
 152 /****************************************************************
 153 ****************************************************************/
 154
 155 static NTSTATUS dsgetdcname_cache_store(TALLOC_CTX *mem_ctx,
 156                                         const char *domain_name,
 157                                         const DATA_BLOB *blob)
 158 {
 159         time_t expire_time;
 160         char *key;
 161         bool ret = false;
 162
 163         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 164         if (!key) {
 165                 return NT_STATUS_NO_MEMORY;
 166         }
 167
 168         expire_time = time(NULL) + DSGETDCNAME_CACHE_TTL;
 169
 170         ret = gencache_set_data_blob(key, blob, expire_time);
 171
 172         return ret ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
 173 }
 174
 175 /****************************************************************
 176 ****************************************************************/
 177
 178 static NTSTATUS store_cldap_reply(TALLOC_CTX *mem_ctx,
 179                                   uint32_t flags,
 180                                   struct sockaddr_storage *ss,
 181                                   uint32_t nt_version,
 182                                   struct NETLOGON_SAM_LOGON_RESPONSE_EX *r)
 183 {
 184         DATA_BLOB blob;
 185         enum ndr_err_code ndr_err;
 186         NTSTATUS status;
 187         char addr[INET6_ADDRSTRLEN];
 188
 189        print_sockaddr(addr, sizeof(addr), ss);
 190
 191         /* FIXME */
 192         r->sockaddr_size = 0x10; /* the w32 winsock addr size */
 193         r->sockaddr.sockaddr_family = 2; /* AF_INET */
 194         r->sockaddr.pdc_ip = talloc_strdup(mem_ctx, addr);
 195
 196         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, r,
 197                        (ndr_push_flags_fn_t)ndr_push_NETLOGON_SAM_LOGON_RESPONSE_EX);
 198         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 199                 return ndr_map_error2ntstatus(ndr_err);
 200         }
 201
 202         if (r->domain_name) {
 203                 status = dsgetdcname_cache_store(mem_ctx, r->domain_name, &blob);
 204                 if (!NT_STATUS_IS_OK(status)) {
 205                         goto done;
 206                 }
 207                 if (r->client_site) {
 208                         sitename_store(r->domain_name, r->client_site);
 209                 }
 210         }
 211         if (r->dns_domain) {
 212                 status = dsgetdcname_cache_store(mem_ctx, r->dns_domain, &blob);
 213                 if (!NT_STATUS_IS_OK(status)) {
 214                         goto done;
 215                 }
 216                 if (r->client_site) {
 217                         sitename_store(r->dns_domain, r->client_site);
 218                 }
 219         }
 220
 221         status = NT_STATUS_OK;
 222
 223  done:
 224         data_blob_free(&blob);
 225
 226         return status;
 227 }
 228
 229 /****************************************************************
 230 ****************************************************************/
 231
 232 static uint32_t get_cldap_reply_server_flags(struct netlogon_samlogon_response *r,
 233                                              uint32_t nt_version)
 234 {
 235         switch (nt_version & 0x0000001f) {
 236                 case 0:
 237                 case 1:
 238                 case 16:
 239                 case 17:
 240                         return 0;
 241                 case 2:
 242                 case 3:
 243                 case 18:
 244                 case 19:
 245                         return r->data.nt5.server_type;
 246                 case 4:
 247                 case 5:
 248                 case 6:
 249                 case 7:
 250                         return r->data.nt5_ex.server_type;
 251                 case 8:
 252                 case 9:
 253                 case 10:
 254                 case 11:
 255                 case 12:
 256                 case 13:
 257                 case 14:
 258                 case 15:
 259                         return r->data.nt5_ex.server_type;
 260                 case 20:
 261                 case 21:
 262                 case 22:
 263                 case 23:
 264                 case 24:
 265                 case 25:
 266                 case 26:
 267                 case 27:
 268                 case 28:
 269                         return r->data.nt5_ex.server_type;
 270                 case 29:
 271                 case 30:
 272                 case 31:
 273                         return r->data.nt5_ex.server_type;
 274                 default:
 275                         return 0;
 276         }
 277 }
 278
 279 /****************************************************************
 280 ****************************************************************/
 281
 282 static NTSTATUS dsgetdcname_cache_fetch(TALLOC_CTX *mem_ctx,
 283                                         const char *domain_name,
 284                                         const struct GUID *domain_guid,
 285                                         uint32_t flags,
 286                                         struct netr_DsRGetDCNameInfo **info_p)
 287 {
 288         char *key;
 289         DATA_BLOB blob;
 290         enum ndr_err_code ndr_err;
 291         struct netr_DsRGetDCNameInfo *info;
 292         struct NETLOGON_SAM_LOGON_RESPONSE_EX r;
 293         NTSTATUS status;
 294
 295         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 296         if (!key) {
 297                 return NT_STATUS_NO_MEMORY;
 298         }
 299
 300         if (!gencache_get_data_blob(key, NULL, &blob, NULL, NULL)) {
 301                 return NT_STATUS_NOT_FOUND;
 302         }
 303
 304         info = talloc_zero(mem_ctx, struct netr_DsRGetDCNameInfo);
 305         if (!info) {
 306                 data_blob_free(&blob);
 307                 return NT_STATUS_NO_MEMORY;
 308         }
 309
 310         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &r,
 311                       (ndr_pull_flags_fn_t)ndr_pull_NETLOGON_SAM_LOGON_RESPONSE_EX);
 312
 313         data_blob_free(&blob);
 314         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 315                 dsgetdcname_cache_delete(mem_ctx, domain_name);
 316                 return ndr_map_error2ntstatus(ndr_err);
 317         }
 318
 319         status = make_dc_info_from_cldap_reply(mem_ctx, flags, NULL,
 320                                                &r, &info);
 321         if (!NT_STATUS_IS_OK(status)) {
 322                 return status;
 323         }
 324
 325         if (DEBUGLEVEL >= 10) {
 326                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, info);
 327         }
 328
 329         /* check flags */
 330         if (!check_cldap_reply_required_flags(info->dc_flags, flags)) {
 331                 DEBUG(10,("invalid flags\n"));
 332                 return NT_STATUS_INVALID_PARAMETER;
 333         }
 334
 335         if ((flags & DS_IP_REQUIRED) &&
 336             (info->dc_address_type != DS_ADDRESS_TYPE_INET)) {
 337                 return NT_STATUS_INVALID_PARAMETER_MIX;
 338         }
 339
 340         *info_p = info;
 341
 342         return NT_STATUS_OK;
 343 }
 344
 345 /****************************************************************
 346 ****************************************************************/
 347
 348 static NTSTATUS dsgetdcname_cached(TALLOC_CTX *mem_ctx,
 349                                    struct messaging_context *msg_ctx,
 350                                    const char *domain_name,
 351                                    const struct GUID *domain_guid,
 352                                    uint32_t flags,
 353                                    const char *site_name,
 354                                    struct netr_DsRGetDCNameInfo **info)
 355 {
 356         NTSTATUS status;
 357
 358         status = dsgetdcname_cache_fetch(mem_ctx, domain_name, domain_guid,
 359                                          flags, info);
 360         if (!NT_STATUS_IS_OK(status)
 361             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 362                 DEBUG(10,("dsgetdcname_cached: cache fetch failed with: %s\n",
 363                         nt_errstr(status)));
 364                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 365         }
 366
 367         if (flags & DS_BACKGROUND_ONLY) {
 368                 return status;
 369         }
 370
 371         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 372                 struct netr_DsRGetDCNameInfo *dc_info;
 373
 374                 status = dsgetdcname(mem_ctx, msg_ctx, domain_name,
 375                                      domain_guid, site_name,
 376                                      flags | DS_FORCE_REDISCOVERY,
 377                                      &dc_info);
 378
 379                 if (!NT_STATUS_IS_OK(status)) {
 380                         return status;
 381                 }
 382
 383                 *info = dc_info;
 384         }
 385
 386         return status;
 387 }
 388
 389 /****************************************************************
 390 ****************************************************************/
 391
 392 static bool check_allowed_required_flags(uint32_t flags,
 393                                          const char *site_name)
 394 {
 395         uint32_t return_type = flags & (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME);
 396         uint32_t offered_type = flags & (DS_IS_FLAT_NAME|DS_IS_DNS_NAME);
 397         uint32_t query_type = flags & (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY);
 398
 399         /* FIXME: check for DSGETDC_VALID_FLAGS and check for excluse bits
 400          * (DS_PDC_REQUIRED, DS_KDC_REQUIRED, DS_GC_SERVER_REQUIRED) */
 401
 402         debug_dsdcinfo_flags(10, flags);
 403
 404         if ((flags & DS_TRY_NEXTCLOSEST_SITE) && site_name) {
 405                 return false;
 406         }
 407
 408         if (return_type == (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME)) {
 409                 return false;
 410         }
 411
 412         if (offered_type == (DS_IS_DNS_NAME|DS_IS_FLAT_NAME)) {
 413                 return false;
 414         }
 415
 416         if (query_type == (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY)) {
 417                 return false;
 418         }
 419
 420 #if 0
 421         if ((flags & DS_RETURN_DNS_NAME) && (!(flags & DS_IP_REQUIRED))) {
 422                 printf("gd: here5 \n");
 423                 return false;
 424         }
 425 #endif
 426         return true;
 427 }
 428
 429 /****************************************************************
 430 ****************************************************************/
 431
 432 static NTSTATUS discover_dc_netbios(TALLOC_CTX *mem_ctx,
 433                                     const char *domain_name,
 434                                     uint32_t flags,
 435                                     struct ip_service_name **returned_dclist,
 436                                     int *returned_count)
 437 {
 438         NTSTATUS status;
 439         enum nbt_name_type name_type = NBT_NAME_LOGON;
 440         struct ip_service *iplist;
 441         int i;
 442         struct ip_service_name *dclist = NULL;
 443         int count;
 444         static const char *resolve_order[] = { "lmhosts", "wins", "bcast", NULL };
 445
 446         *returned_dclist = NULL;
 447         *returned_count = 0;
 448
 449         if (flags & DS_PDC_REQUIRED) {
 450                 name_type = NBT_NAME_PDC;
 451         }
 452
 453         status = internal_resolve_name(domain_name, name_type, NULL,
 454                                        &iplist, &count,
 455                                        resolve_order);
 456         if (!NT_STATUS_IS_OK(status)) {
 457                 DEBUG(10,("discover_dc_netbios: failed to find DC\n"));
 458                 return status;
 459         }
 460
 461         dclist = talloc_zero_array(mem_ctx, struct ip_service_name, count);
 462         if (!dclist) {
 463                 SAFE_FREE(iplist);
 464                 return NT_STATUS_NO_MEMORY;
 465         }
 466
 467         for (i=0; i<count; i++) {
 468
 469                 char addr[INET6_ADDRSTRLEN];
 470                 struct ip_service_name *r = &dclist[i];
 471
 472                 print_sockaddr(addr, sizeof(addr),
 473                                &iplist[i].ss);
 474
 475                 r->ss   = iplist[i].ss;
 476                 r->hostname = talloc_strdup(mem_ctx, addr);
 477                 if (!r->hostname) {
 478                         SAFE_FREE(iplist);
 479                         return NT_STATUS_NO_MEMORY;
 480                 }
 481
 482         }
 483
 484         *returned_dclist = dclist;
 485         *returned_count = count;
 486         SAFE_FREE(iplist);
 487
 488         return NT_STATUS_OK;
 489 }
 490
 491 /****************************************************************
 492 ****************************************************************/
 493
 494 static NTSTATUS discover_dc_dns(TALLOC_CTX *mem_ctx,
 495                                 const char *domain_name,
 496                                 const struct GUID *domain_guid,
 497                                 uint32_t flags,
 498                                 const char *site_name,
 499                                 struct ip_service_name **returned_dclist,
 500                                 int *return_count)
 501 {
 502         int i, j;
 503         NTSTATUS status;
 504         struct dns_rr_srv *dcs = NULL;
 505         int numdcs = 0;
 506         int numaddrs = 0;
 507         struct ip_service_name *dclist = NULL;
 508         int count = 0;
 509
 510         if (flags & DS_PDC_REQUIRED) {
 511                 status = ads_dns_query_pdc(mem_ctx,
 512                                            domain_name,
 513                                            &dcs,
 514                                            &numdcs);
 515         } else if (flags & DS_GC_SERVER_REQUIRED) {
 516                 status = ads_dns_query_gcs(mem_ctx,
 517                                            domain_name,
 518                                            site_name,
 519                                            &dcs,
 520                                            &numdcs);
 521         } else if (flags & DS_KDC_REQUIRED) {
 522                 status = ads_dns_query_kdcs(mem_ctx,
 523                                             domain_name,
 524                                             site_name,
 525                                             &dcs,
 526                                             &numdcs);
 527         } else if (flags & DS_DIRECTORY_SERVICE_REQUIRED) {
 528                 status = ads_dns_query_dcs(mem_ctx,
 529                                            domain_name,
 530                                            site_name,
 531                                            &dcs,
 532                                            &numdcs);
 533         } else if (domain_guid) {
 534                 struct GUID_txt_buf buf;
 535                 GUID_buf_string(domain_guid, &buf);
 536
 537                 status = ads_dns_query_dcs_guid(mem_ctx,
 538                                                 domain_name,
 539                                                 buf.buf,
 540                                                 &dcs,
 541                                                 &numdcs);
 542         } else {
 543                 status = ads_dns_query_dcs(mem_ctx,
 544                                            domain_name,
 545                                            site_name,
 546                                            &dcs,
 547                                            &numdcs);
 548         }
 549
 550         if (!NT_STATUS_IS_OK(status)) {
 551                 return status;
 552         }
 553
 554         if (numdcs == 0) {
 555                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 556         }
 557
 558         for (i=0;i<numdcs;i++) {
 559                 numaddrs += MAX(dcs[i].num_ips,1);
 560         }
 561
 562         dclist = talloc_zero_array(mem_ctx,
 563                                    struct ip_service_name,
 564                                    numaddrs);
 565         if (!dclist) {
 566                 return NT_STATUS_NO_MEMORY;
 567         }
 568
 569         /* now unroll the list of IP addresses */
 570
 571         *return_count = 0;
 572         i = 0;
 573         j = 0;
 574
 575         while ((i < numdcs) && (count < numaddrs)) {
 576
 577                 struct ip_service_name *r = &dclist[count];
 578
 579                 r->hostname = dcs[i].hostname;
 580
 581                 /* If we don't have an IP list for a name, lookup it up */
 582
 583                 if (!dcs[i].ss_s) {
 584                         interpret_string_addr_prefer_ipv4(&r->ss,
 585                                                 dcs[i].hostname, 0);
 586                         i++;
 587                         j = 0;
 588                 } else {
 589                         /* use the IP addresses from the SRV response */
 590
 591                         if (j >= dcs[i].num_ips) {
 592                                 i++;
 593                                 j = 0;
 594                                 continue;
 595                         }
 596
 597                         r->ss = dcs[i].ss_s[j];
 598                         j++;
 599                 }
 600
 601                 /* make sure it is a valid IP.  I considered checking the
 602                  * negative connection cache, but this is the wrong place for
 603                  * it.  Maybe only as a hack. After think about it, if all of
 604                  * the IP addresses returned from DNS are dead, what hope does a
 605                  * netbios name lookup have?  The standard reason for falling
 606                  * back to netbios lookups is that our DNS server doesn't know
 607                  * anything about the DC's   -- jerry */
 608
 609                 if (!is_zero_addr(&r->ss)) {
 610                         count++;
 611                         continue;
 612                 }
 613         }
 614
 615         *returned_dclist = dclist;
 616         *return_count = count;
 617
 618         if (count > 0) {
 619                 return NT_STATUS_OK;
 620         }
 621
 622         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 623 }
 624
 625 /****************************************************************
 626 ****************************************************************/
 627
 628 static NTSTATUS make_domain_controller_info(TALLOC_CTX *mem_ctx,
 629                                             const char *dc_unc,
 630                                             const char *dc_address,
 631                                             uint32_t dc_address_type,
 632                                             const struct GUID *domain_guid,
 633                                             const char *domain_name,
 634                                             const char *forest_name,
 635                                             uint32_t flags,
 636                                             const char *dc_site_name,
 637                                             const char *client_site_name,
 638                                             struct netr_DsRGetDCNameInfo **info_out)
 639 {
 640         struct netr_DsRGetDCNameInfo *info;
 641
 642         info = talloc_zero(mem_ctx, struct netr_DsRGetDCNameInfo);
 643         NT_STATUS_HAVE_NO_MEMORY(info);
 644
 645         if (dc_unc) {
 646                 info->dc_unc = talloc_strdup(mem_ctx, dc_unc);
 647                 NT_STATUS_HAVE_NO_MEMORY(info->dc_unc);
 648         }
 649
 650         if (dc_address) {
 651                 if (!(dc_address[0] == '\\' && dc_address[1] == '\\')) {
 652                         info->dc_address = talloc_asprintf(mem_ctx, "\\\\%s",
 653                                                            dc_address);
 654                 } else {
 655                         info->dc_address = talloc_strdup(mem_ctx, dc_address);
 656                 }
 657                 NT_STATUS_HAVE_NO_MEMORY(info->dc_address);
 658         }
 659
 660         info->dc_address_type = dc_address_type;
 661
 662         if (domain_guid) {
 663                 info->domain_guid = *domain_guid;
 664         }
 665
 666         if (domain_name) {
 667                 info->domain_name = talloc_strdup(mem_ctx, domain_name);
 668                 NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
 669         }
 670
 671         if (forest_name && *forest_name) {
 672                 info->forest_name = talloc_strdup(mem_ctx, forest_name);
 673                 NT_STATUS_HAVE_NO_MEMORY(info->forest_name);
 674                 flags |= DS_DNS_FOREST_ROOT;
 675         }
 676
 677         info->dc_flags = flags;
 678
 679         if (dc_site_name) {
 680                 info->dc_site_name = talloc_strdup(mem_ctx, dc_site_name);
 681                 NT_STATUS_HAVE_NO_MEMORY(info->dc_site_name);
 682         }
 683
 684         if (client_site_name) {
 685                 info->client_site_name = talloc_strdup(mem_ctx,
 686                                                        client_site_name);
 687                 NT_STATUS_HAVE_NO_MEMORY(info->client_site_name);
 688         }
 689
 690         *info_out = info;
 691
 692         return NT_STATUS_OK;
 693 }
 694
 695 /****************************************************************
 696 ****************************************************************/
 697
 698 static void map_dc_and_domain_names(uint32_t flags,
 699                                     const char *dc_name,
 700                                     const char *domain_name,
 701                                     const char *dns_dc_name,
 702                                     const char *dns_domain_name,
 703                                     uint32_t *dc_flags,
 704                                     const char **hostname_p,
 705                                     const char **domain_p)
 706 {
 707         switch (flags & 0xf0000000) {
 708                 case DS_RETURN_FLAT_NAME:
 709                         if (dc_name && domain_name &&
 710                             *dc_name && *domain_name) {
 711                                 *hostname_p = dc_name;
 712                                 *domain_p = domain_name;
 713                                 break;
 714                         }
 715                 case DS_RETURN_DNS_NAME:
 716                 default:
 717                         if (dns_dc_name && dns_domain_name &&
 718                             *dns_dc_name && *dns_domain_name) {
 719                                 *hostname_p = dns_dc_name;
 720                                 *domain_p = dns_domain_name;
 721                                 *dc_flags |= DS_DNS_DOMAIN | DS_DNS_CONTROLLER;
 722                                 break;
 723                         }
 724                         if (dc_name && domain_name &&
 725                             *dc_name && *domain_name) {
 726                                 *hostname_p = dc_name;
 727                                 *domain_p = domain_name;
 728                                 break;
 729                         }
 730         }
 731 }
 732
 733 /****************************************************************
 734 ****************************************************************/
 735
 736 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
 737                                               uint32_t flags,
 738                                               struct sockaddr_storage *ss,
 739                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
 740                                               struct netr_DsRGetDCNameInfo **info)
 741 {
 742         const char *dc_hostname = NULL;
 743         const char *dc_domain_name = NULL;
 744         const char *dc_address = NULL;
 745         const char *dc_forest = NULL;
 746         uint32_t dc_address_type = 0;
 747         uint32_t dc_flags = 0;
 748         struct GUID *dc_domain_guid = NULL;
 749         const char *dc_server_site = NULL;
 750         const char *dc_client_site = NULL;
 751
 752         char addr[INET6_ADDRSTRLEN];
 753
 754         if (ss) {
 755                 print_sockaddr(addr, sizeof(addr), ss);
 756                 dc_address = addr;
 757                 dc_address_type = DS_ADDRESS_TYPE_INET;
 758         } else {
 759                 if (r->sockaddr.pdc_ip) {
 760                         dc_address      = r->sockaddr.pdc_ip;
 761                         dc_address_type = DS_ADDRESS_TYPE_INET;
 762                 } else {
 763                         dc_address      = r->pdc_name;
 764                         dc_address_type = DS_ADDRESS_TYPE_NETBIOS;
 765                 }
 766         }
 767
 768         map_dc_and_domain_names(flags,
 769                                 r->pdc_name,
 770                                 r->domain_name,
 771                                 r->pdc_dns_name,
 772                                 r->dns_domain,
 773                                 &dc_flags,
 774                                 &dc_hostname,
 775                                 &dc_domain_name);
 776
 777         dc_flags        |= r->server_type;
 778         dc_forest       = r->forest;
 779         dc_domain_guid  = &r->domain_uuid;
 780         dc_server_site  = r->server_site;
 781         dc_client_site  = r->client_site;
 782
 783         return make_domain_controller_info(mem_ctx,
 784                                            dc_hostname,
 785                                            dc_address,
 786                                            dc_address_type,
 787                                            dc_domain_guid,
 788                                            dc_domain_name,
 789                                            dc_forest,
 790                                            dc_flags,
 791                                            dc_server_site,
 792                                            dc_client_site,
 793                                            info);
 794 }
 795
 796 /****************************************************************
 797 ****************************************************************/
 798
 799 static uint32_t map_ds_flags_to_nt_version(uint32_t flags)
 800 {
 801         uint32_t nt_version = 0;
 802
 803         if (flags & DS_PDC_REQUIRED) {
 804                 nt_version |= NETLOGON_NT_VERSION_PDC;
 805         }
 806
 807         if (flags & DS_GC_SERVER_REQUIRED) {
 808                 nt_version |= NETLOGON_NT_VERSION_GC;
 809         }
 810
 811         if (flags & DS_TRY_NEXTCLOSEST_SITE) {
 812                 nt_version |= NETLOGON_NT_VERSION_WITH_CLOSEST_SITE;
 813         }
 814
 815         if (flags & DS_IP_REQUIRED) {
 816                 nt_version |= NETLOGON_NT_VERSION_IP;
 817         }
 818
 819         return nt_version;
 820 }
 821
 822 /****************************************************************
 823 ****************************************************************/
 824
 825 static NTSTATUS process_dc_dns(TALLOC_CTX *mem_ctx,
 826                                const char *domain_name,
 827                                uint32_t flags,
 828                                struct ip_service_name *dclist,
 829                                int num_dcs,
 830                                struct netr_DsRGetDCNameInfo **info)
 831 {
 832         int i = 0;
 833         bool valid_dc = false;
 834         struct netlogon_samlogon_response *r = NULL;
 835         uint32_t nt_version = NETLOGON_NT_VERSION_5 |
 836                               NETLOGON_NT_VERSION_5EX;
 837         uint32_t ret_flags = 0;
 838         NTSTATUS status;
 839
 840         nt_version |= map_ds_flags_to_nt_version(flags);
 841
 842         for (i=0; i<num_dcs; i++) {
 843
 844                 char addr[INET6_ADDRSTRLEN];
 845                 print_sockaddr(addr, sizeof(addr), &dclist[i].ss);
 846
 847                 DEBUG(10,("LDAP ping to %s (%s)\n", dclist[i].hostname, addr));
 848
 849                 if (ads_cldap_netlogon(mem_ctx, &dclist[i].ss,
 850                                         domain_name,
 851                                         nt_version,
 852                                         &r))
 853                 {
 854                         nt_version = r->ntver;
 855                         ret_flags = get_cldap_reply_server_flags(r, nt_version);
 856
 857                         if (check_cldap_reply_required_flags(ret_flags, flags)) {
 858                                 valid_dc = true;
 859                                 break;
 860                         }
 861                 }
 862
 863                 continue;
 864         }
 865
 866         if (!valid_dc) {
 867                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 868         }
 869
 870         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 871                                                &r->data.nt5_ex, info);
 872         if (NT_STATUS_IS_OK(status)) {
 873                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 874                                          nt_version, &r->data.nt5_ex);
 875         }
 876
 877         return status;
 878 }
 879
 880 /****************************************************************
 881 ****************************************************************/
 882
 883 /****************************************************************
 884 ****************************************************************/
 885
 886 static NTSTATUS process_dc_netbios(TALLOC_CTX *mem_ctx,
 887                                    struct messaging_context *msg_ctx,
 888                                    const char *domain_name,
 889                                    uint32_t flags,
 890                                    struct ip_service_name *dclist,
 891                                    int num_dcs,
 892                                    struct netr_DsRGetDCNameInfo **info)
 893 {
 894         struct sockaddr_storage ss;
 895         struct ip_service ip_list;
 896         enum nbt_name_type name_type = NBT_NAME_LOGON;
 897         NTSTATUS status;
 898         int i;
 899         const char *dc_name = NULL;
 900         fstring tmp_dc_name;
 901         struct netlogon_samlogon_response *r = NULL;
 902         bool store_cache = false;
 903         uint32_t nt_version = NETLOGON_NT_VERSION_1 |
 904                               NETLOGON_NT_VERSION_5 |
 905                               NETLOGON_NT_VERSION_5EX_WITH_IP;
 906
 907         if (msg_ctx == NULL) {
 908                 return NT_STATUS_INVALID_PARAMETER;
 909         }
 910
 911         if (flags & DS_PDC_REQUIRED) {
 912                 name_type = NBT_NAME_PDC;
 913         }
 914
 915         nt_version |= map_ds_flags_to_nt_version(flags);
 916
 917         DEBUG(10,("process_dc_netbios\n"));
 918
 919         for (i=0; i<num_dcs; i++) {
 920                 uint16_t val;
 921
 922                 generate_random_buffer((uint8_t *)&val, 2);
 923
 924                 ip_list.ss = dclist[i].ss;
 925                 ip_list.port = 0;
 926
 927                 if (!interpret_string_addr_prefer_ipv4(&ss, dclist[i].hostname, AI_NUMERICHOST)) {
 928                         return NT_STATUS_UNSUCCESSFUL;
 929                 }
 930
 931                 status = nbt_getdc(msg_ctx, 10, &dclist[i].ss, domain_name,
 932                                    NULL, nt_version,
 933                                    mem_ctx, &nt_version, &dc_name, &r);
 934                 if (NT_STATUS_IS_OK(status)) {
 935                         store_cache = true;
 936                         namecache_store(dc_name, NBT_NAME_SERVER, 1, &ip_list);
 937                         goto make_reply;
 938                 }
 939
 940                 if (name_status_find(domain_name,
 941                                      name_type,
 942                                      NBT_NAME_SERVER,
 943                                      &dclist[i].ss,
 944                                      tmp_dc_name))
 945                 {
 946                         struct NETLOGON_SAM_LOGON_RESPONSE_NT40 logon1;
 947
 948                         r = talloc_zero(mem_ctx, struct netlogon_samlogon_response);
 949                         NT_STATUS_HAVE_NO_MEMORY(r);
 950
 951                         ZERO_STRUCT(logon1);
 952
 953                         nt_version = NETLOGON_NT_VERSION_1;
 954
 955                         logon1.nt_version = nt_version;
 956                         logon1.pdc_name = tmp_dc_name;
 957                         logon1.domain_name = talloc_strdup_upper(mem_ctx, domain_name);
 958                         NT_STATUS_HAVE_NO_MEMORY(logon1.domain_name);
 959
 960                         r->data.nt4 = logon1;
 961                         r->ntver = nt_version;
 962
 963                         map_netlogon_samlogon_response(r);
 964
 965                         namecache_store(tmp_dc_name, NBT_NAME_SERVER, 1, &ip_list);
 966
 967                         goto make_reply;
 968                 }
 969         }
 970
 971         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 972
 973  make_reply:
 974
 975         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 976                                                &r->data.nt5_ex, info);
 977         if (NT_STATUS_IS_OK(status) && store_cache) {
 978                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 979                                          nt_version, &r->data.nt5_ex);
 980         }
 981
 982         return status;
 983 }
 984
 985 /****************************************************************
 986 ****************************************************************/
 987
 988 static NTSTATUS dsgetdcname_rediscover(TALLOC_CTX *mem_ctx,
 989                                        struct messaging_context *msg_ctx,
 990                                        const char *domain_name,
 991                                        const struct GUID *domain_guid,
 992                                        uint32_t flags,
 993                                        const char *site_name,
 994                                        struct netr_DsRGetDCNameInfo **info)
 995 {
 996         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 997         struct ip_service_name *dclist = NULL;
 998         int num_dcs;
 999
1000         DEBUG(10,("dsgetdcname_rediscover\n"));
1001
1002         if (flags & DS_IS_FLAT_NAME) {
1003
1004                 if (lp_disable_netbios()) {
1005                         return NT_STATUS_NOT_SUPPORTED;
1006                 }
1007
1008                 status = discover_dc_netbios(mem_ctx, domain_name, flags,
1009                                              &dclist, &num_dcs);
1010                 NT_STATUS_NOT_OK_RETURN(status);
1011
1012                 return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags,
1013                                           dclist, num_dcs, info);
1014         }
1015
1016         if (flags & DS_IS_DNS_NAME) {
1017
1018                 status = discover_dc_dns(mem_ctx, domain_name, domain_guid,
1019                                          flags, site_name, &dclist, &num_dcs);
1020                 NT_STATUS_NOT_OK_RETURN(status);
1021
1022                 return process_dc_dns(mem_ctx, domain_name, flags,
1023                                       dclist, num_dcs, info);
1024         }
1025
1026         status = discover_dc_dns(mem_ctx, domain_name, domain_guid, flags,
1027                                  site_name, &dclist, &num_dcs);
1028
1029         if (NT_STATUS_IS_OK(status) && num_dcs != 0) {
1030
1031                 status = process_dc_dns(mem_ctx, domain_name, flags, dclist,
1032                                         num_dcs, info);
1033                 if (NT_STATUS_IS_OK(status)) {
1034                         return status;
1035                 }
1036         }
1037
1038         if (lp_disable_netbios()) {
1039                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1040         }
1041
1042         status = discover_dc_netbios(mem_ctx, domain_name, flags, &dclist,
1043                                      &num_dcs);
1044         NT_STATUS_NOT_OK_RETURN(status);
1045
1046         return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags, dclist,
1047                                   num_dcs, info);
1048 }
1049
1050 static bool is_closest_site(struct netr_DsRGetDCNameInfo *info)
1051 {
1052         if (info->dc_flags & DS_SERVER_CLOSEST) {
1053                 return true;
1054         }
1055
1056         if (!info->client_site_name) {
1057                 return true;
1058         }
1059
1060         if (!info->dc_site_name) {
1061                 return false;
1062         }
1063
1064         if (strcmp(info->client_site_name, info->dc_site_name) == 0) {
1065                 return true;
1066         }
1067
1068         return false;
1069 }
1070
1071 /********************************************************************
1072  Internal dsgetdcname.
1073 ********************************************************************/
1074
1075 static NTSTATUS dsgetdcname_internal(TALLOC_CTX *mem_ctx,
1076                      struct messaging_context *msg_ctx,
1077                      const char *domain_name,
1078                      const struct GUID *domain_guid,
1079                      const char *site_name,
1080                      uint32_t flags,
1081                      struct netr_DsRGetDCNameInfo **info)
1082 {
1083         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1084         struct netr_DsRGetDCNameInfo *myinfo = NULL;
1085         bool first = true;
1086         struct netr_DsRGetDCNameInfo *first_info = NULL;
1087
1088         DEBUG(10,("dsgetdcname_internal: domain_name: %s, "
1089                   "domain_guid: %s, site_name: %s, flags: 0x%08x\n",
1090                   domain_name,
1091                   domain_guid ? GUID_string(mem_ctx, domain_guid) : "(null)",
1092                   site_name ? site_name : "(null)", flags));
1093
1094         *info = NULL;
1095
1096         if (!check_allowed_required_flags(flags, site_name)) {
1097                 DEBUG(0,("invalid flags specified\n"));
1098                 return NT_STATUS_INVALID_PARAMETER;
1099         }
1100
1101         if (flags & DS_FORCE_REDISCOVERY) {
1102                 goto rediscover;
1103         }
1104
1105         status = dsgetdcname_cached(mem_ctx, msg_ctx, domain_name, domain_guid,
1106                                     flags, site_name, &myinfo);
1107         if (NT_STATUS_IS_OK(status)) {
1108                 goto done;
1109         }
1110
1111         if (flags & DS_BACKGROUND_ONLY) {
1112                 goto done;
1113         }
1114
1115  rediscover:
1116         status = dsgetdcname_rediscover(mem_ctx, msg_ctx, domain_name,
1117                                         domain_guid, flags, site_name,
1118                                         &myinfo);
1119
1120  done:
1121         if (!NT_STATUS_IS_OK(status)) {
1122                 if (!first) {
1123                         *info = first_info;
1124                         return NT_STATUS_OK;
1125                 }
1126                 return status;
1127         }
1128
1129         if (!first) {
1130                 TALLOC_FREE(first_info);
1131         } else if (!is_closest_site(myinfo)) {
1132                 first = false;
1133                 first_info = myinfo;
1134                 /* TODO: may use the next_closest_site here */
1135                 site_name = myinfo->client_site_name;
1136                 goto rediscover;
1137         }
1138
1139         *info = myinfo;
1140         return NT_STATUS_OK;
1141 }
1142
1143 /********************************************************************
1144  dsgetdcname.
1145
1146  This will be the only public function here.
1147 ********************************************************************/
1148
1149 NTSTATUS dsgetdcname(TALLOC_CTX *mem_ctx,
1150                      struct messaging_context *msg_ctx,
1151                      const char *domain_name,
1152                      const struct GUID *domain_guid,
1153                      const char *site_name,
1154                      uint32_t flags,
1155                      struct netr_DsRGetDCNameInfo **info)
1156 {
1157         NTSTATUS status;
1158         const char *query_site = NULL;
1159         char *ptr_to_free = NULL;
1160         bool retry_query_with_null = false;
1161
1162         if ((site_name == NULL) || (site_name[0] == '\0')) {
1163                 ptr_to_free = sitename_fetch(mem_ctx, domain_name);
1164                 if (ptr_to_free != NULL) {
1165                         retry_query_with_null = true;
1166                 }
1167                 query_site = ptr_to_free;
1168         } else {
1169                 query_site = site_name;
1170         }
1171
1172         status = dsgetdcname_internal(mem_ctx,
1173                                 msg_ctx,
1174                                 domain_name,
1175                                 domain_guid,
1176                                 query_site,
1177                                 flags,
1178                                 info);
1179
1180         TALLOC_FREE(ptr_to_free);
1181
1182         if (!NT_STATUS_EQUAL(status, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND)) {
1183                 return status;
1184         }
1185
1186         /* Should we try again with site_name == NULL ? */
1187         if (retry_query_with_null) {
1188                 status = dsgetdcname_internal(mem_ctx,
1189                                         msg_ctx,
1190                                         domain_name,
1191                                         domain_guid,
1192                                         NULL,
1193                                         flags,
1194                                         info);
1195         }
1196
1197         return status;
1198 }