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 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 #define RETURN_ON_FALSE(x) if (!(x)) return false;
 283
 284 static bool check_cldap_reply_required_flags(uint32_t ret_flags,
 285                                              uint32_t req_flags)
 286 {
 287         if (ret_flags == 0) {
 288                 return true;
 289         }
 290
 291         if (req_flags & DS_PDC_REQUIRED)
 292                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_PDC);
 293
 294         if (req_flags & DS_GC_SERVER_REQUIRED)
 295                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_GC);
 296
 297         if (req_flags & DS_ONLY_LDAP_NEEDED)
 298                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_LDAP);
 299
 300         if ((req_flags & DS_DIRECTORY_SERVICE_REQUIRED) ||
 301             (req_flags & DS_DIRECTORY_SERVICE_PREFERRED))
 302                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_DS);
 303
 304         if (req_flags & DS_KDC_REQUIRED)
 305                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_KDC);
 306
 307         if (req_flags & DS_TIMESERV_REQUIRED)
 308                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_TIMESERV);
 309
 310         if (req_flags & DS_WRITABLE_REQUIRED)
 311                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_WRITABLE);
 312
 313         return true;
 314 }
 315
 316 /****************************************************************
 317 ****************************************************************/
 318
 319 static NTSTATUS dsgetdcname_cache_fetch(TALLOC_CTX *mem_ctx,
 320                                         const char *domain_name,
 321                                         const struct GUID *domain_guid,
 322                                         uint32_t flags,
 323                                         struct netr_DsRGetDCNameInfo **info_p)
 324 {
 325         char *key;
 326         DATA_BLOB blob;
 327         enum ndr_err_code ndr_err;
 328         struct netr_DsRGetDCNameInfo *info;
 329         struct NETLOGON_SAM_LOGON_RESPONSE_EX r;
 330         NTSTATUS status;
 331
 332         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 333         if (!key) {
 334                 return NT_STATUS_NO_MEMORY;
 335         }
 336
 337         if (!gencache_get_data_blob(key, NULL, &blob, NULL, NULL)) {
 338                 return NT_STATUS_NOT_FOUND;
 339         }
 340
 341         info = talloc_zero(mem_ctx, struct netr_DsRGetDCNameInfo);
 342         if (!info) {
 343                 data_blob_free(&blob);
 344                 return NT_STATUS_NO_MEMORY;
 345         }
 346
 347         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &r,
 348                       (ndr_pull_flags_fn_t)ndr_pull_NETLOGON_SAM_LOGON_RESPONSE_EX);
 349
 350         data_blob_free(&blob);
 351         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 352                 dsgetdcname_cache_delete(mem_ctx, domain_name);
 353                 return ndr_map_error2ntstatus(ndr_err);
 354         }
 355
 356         status = make_dc_info_from_cldap_reply(mem_ctx, flags, NULL,
 357                                                &r, &info);
 358         if (!NT_STATUS_IS_OK(status)) {
 359                 return status;
 360         }
 361
 362         if (DEBUGLEVEL >= 10) {
 363                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, info);
 364         }
 365
 366         /* check flags */
 367         if (!check_cldap_reply_required_flags(info->dc_flags, flags)) {
 368                 DEBUG(10,("invalid flags\n"));
 369                 return NT_STATUS_INVALID_PARAMETER;
 370         }
 371
 372         if ((flags & DS_IP_REQUIRED) &&
 373             (info->dc_address_type != DS_ADDRESS_TYPE_INET)) {
 374                 return NT_STATUS_INVALID_PARAMETER_MIX;
 375         }
 376
 377         *info_p = info;
 378
 379         return NT_STATUS_OK;
 380 }
 381
 382 /****************************************************************
 383 ****************************************************************/
 384
 385 static NTSTATUS dsgetdcname_cached(TALLOC_CTX *mem_ctx,
 386                                    struct messaging_context *msg_ctx,
 387                                    const char *domain_name,
 388                                    const struct GUID *domain_guid,
 389                                    uint32_t flags,
 390                                    const char *site_name,
 391                                    struct netr_DsRGetDCNameInfo **info)
 392 {
 393         NTSTATUS status;
 394
 395         status = dsgetdcname_cache_fetch(mem_ctx, domain_name, domain_guid,
 396                                          flags, info);
 397         if (!NT_STATUS_IS_OK(status)
 398             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 399                 DEBUG(10,("dsgetdcname_cached: cache fetch failed with: %s\n",
 400                         nt_errstr(status)));
 401                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 402         }
 403
 404         if (flags & DS_BACKGROUND_ONLY) {
 405                 return status;
 406         }
 407
 408         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 409                 struct netr_DsRGetDCNameInfo *dc_info;
 410
 411                 status = dsgetdcname(mem_ctx, msg_ctx, domain_name,
 412                                      domain_guid, site_name,
 413                                      flags | DS_FORCE_REDISCOVERY,
 414                                      &dc_info);
 415
 416                 if (!NT_STATUS_IS_OK(status)) {
 417                         return status;
 418                 }
 419
 420                 *info = dc_info;
 421         }
 422
 423         return status;
 424 }
 425
 426 /****************************************************************
 427 ****************************************************************/
 428
 429 static bool check_allowed_required_flags(uint32_t flags,
 430                                          const char *site_name)
 431 {
 432         uint32_t return_type = flags & (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME);
 433         uint32_t offered_type = flags & (DS_IS_FLAT_NAME|DS_IS_DNS_NAME);
 434         uint32_t query_type = flags & (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY);
 435
 436         /* FIXME: check for DSGETDC_VALID_FLAGS and check for excluse bits
 437          * (DS_PDC_REQUIRED, DS_KDC_REQUIRED, DS_GC_SERVER_REQUIRED) */
 438
 439         debug_dsdcinfo_flags(10, flags);
 440
 441         if ((flags & DS_TRY_NEXTCLOSEST_SITE) && site_name) {
 442                 return false;
 443         }
 444
 445         if (return_type == (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME)) {
 446                 return false;
 447         }
 448
 449         if (offered_type == (DS_IS_DNS_NAME|DS_IS_FLAT_NAME)) {
 450                 return false;
 451         }
 452
 453         if (query_type == (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY)) {
 454                 return false;
 455         }
 456
 457 #if 0
 458         if ((flags & DS_RETURN_DNS_NAME) && (!(flags & DS_IP_REQUIRED))) {
 459                 printf("gd: here5 \n");
 460                 return false;
 461         }
 462 #endif
 463         return true;
 464 }
 465
 466 /****************************************************************
 467 ****************************************************************/
 468
 469 static NTSTATUS discover_dc_netbios(TALLOC_CTX *mem_ctx,
 470                                     const char *domain_name,
 471                                     uint32_t flags,
 472                                     struct ip_service_name **returned_dclist,
 473                                     int *returned_count)
 474 {
 475         NTSTATUS status;
 476         enum nbt_name_type name_type = NBT_NAME_LOGON;
 477         struct ip_service *iplist;
 478         int i;
 479         struct ip_service_name *dclist = NULL;
 480         int count;
 481         static const char *resolve_order[] = { "lmhosts", "wins", "bcast", NULL };
 482
 483         *returned_dclist = NULL;
 484         *returned_count = 0;
 485
 486         if (lp_disable_netbios()) {
 487                 return NT_STATUS_NOT_SUPPORTED;
 488         }
 489
 490         if (flags & DS_PDC_REQUIRED) {
 491                 name_type = NBT_NAME_PDC;
 492         }
 493
 494         status = internal_resolve_name(domain_name, name_type, NULL,
 495                                        &iplist, &count,
 496                                        resolve_order);
 497         if (!NT_STATUS_IS_OK(status)) {
 498                 DEBUG(10,("discover_dc_netbios: failed to find DC\n"));
 499                 return status;
 500         }
 501
 502         dclist = talloc_zero_array(mem_ctx, struct ip_service_name, count);
 503         if (!dclist) {
 504                 SAFE_FREE(iplist);
 505                 return NT_STATUS_NO_MEMORY;
 506         }
 507
 508         for (i=0; i<count; i++) {
 509
 510                 char addr[INET6_ADDRSTRLEN];
 511                 struct ip_service_name *r = &dclist[i];
 512
 513                 print_sockaddr(addr, sizeof(addr),
 514                                &iplist[i].ss);
 515
 516                 r->ss   = iplist[i].ss;
 517                 r->hostname = talloc_strdup(mem_ctx, addr);
 518                 if (!r->hostname) {
 519                         SAFE_FREE(iplist);
 520                         return NT_STATUS_NO_MEMORY;
 521                 }
 522
 523         }
 524
 525         *returned_dclist = dclist;
 526         *returned_count = count;
 527         SAFE_FREE(iplist);
 528
 529         return NT_STATUS_OK;
 530 }
 531
 532 /****************************************************************
 533 ****************************************************************/
 534
 535 static NTSTATUS discover_dc_dns(TALLOC_CTX *mem_ctx,
 536                                 const char *domain_name,
 537                                 const struct GUID *domain_guid,
 538                                 uint32_t flags,
 539                                 const char *site_name,
 540                                 struct ip_service_name **returned_dclist,
 541                                 int *return_count)
 542 {
 543         int i, j;
 544         NTSTATUS status;
 545         struct dns_rr_srv *dcs = NULL;
 546         int numdcs = 0;
 547         int numaddrs = 0;
 548         struct ip_service_name *dclist = NULL;
 549         int count = 0;
 550         char *guid_string;
 551
 552         if (flags & DS_PDC_REQUIRED) {
 553                 status = ads_dns_query_pdc(mem_ctx,
 554                                            domain_name,
 555                                            &dcs,
 556                                            &numdcs);
 557         } else if (flags & DS_GC_SERVER_REQUIRED) {
 558                 status = ads_dns_query_gcs(mem_ctx,
 559                                            domain_name,
 560                                            site_name,
 561                                            &dcs,
 562                                            &numdcs);
 563         } else if (flags & DS_KDC_REQUIRED) {
 564                 status = ads_dns_query_kdcs(mem_ctx,
 565                                             domain_name,
 566                                             site_name,
 567                                             &dcs,
 568                                             &numdcs);
 569         } else if (flags & DS_DIRECTORY_SERVICE_REQUIRED) {
 570                 status = ads_dns_query_dcs(mem_ctx,
 571                                            domain_name,
 572                                            site_name,
 573                                            &dcs,
 574                                            &numdcs);
 575         } else if (domain_guid) {
 576                 guid_string = GUID_string(mem_ctx, domain_guid);
 577                 if (!guid_string) {
 578                         return NT_STATUS_NO_MEMORY;
 579                 }
 580
 581                 status = ads_dns_query_dcs_guid(mem_ctx,
 582                                                 domain_name,
 583                                                 guid_string,
 584                                                 &dcs,
 585                                                 &numdcs);
 586                 TALLOC_FREE(guid_string);
 587         } else {
 588                 status = ads_dns_query_dcs(mem_ctx,
 589                                            domain_name,
 590                                            site_name,
 591                                            &dcs,
 592                                            &numdcs);
 593         }
 594
 595         if (!NT_STATUS_IS_OK(status)) {
 596                 return status;
 597         }
 598
 599         if (numdcs == 0) {
 600                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 601         }
 602
 603         for (i=0;i<numdcs;i++) {
 604                 numaddrs += MAX(dcs[i].num_ips,1);
 605         }
 606
 607         dclist = talloc_zero_array(mem_ctx,
 608                                    struct ip_service_name,
 609                                    numaddrs);
 610         if (!dclist) {
 611                 return NT_STATUS_NO_MEMORY;
 612         }
 613
 614         /* now unroll the list of IP addresses */
 615
 616         *return_count = 0;
 617         i = 0;
 618         j = 0;
 619
 620         while ((i < numdcs) && (count < numaddrs)) {
 621
 622                 struct ip_service_name *r = &dclist[count];
 623
 624                 r->hostname = dcs[i].hostname;
 625
 626                 /* If we don't have an IP list for a name, lookup it up */
 627
 628                 if (!dcs[i].ss_s) {
 629                         interpret_string_addr_prefer_ipv4(&r->ss,
 630                                                 dcs[i].hostname, 0);
 631                         i++;
 632                         j = 0;
 633                 } else {
 634                         /* use the IP addresses from the SRV response */
 635
 636                         if (j >= dcs[i].num_ips) {
 637                                 i++;
 638                                 j = 0;
 639                                 continue;
 640                         }
 641
 642                         r->ss = dcs[i].ss_s[j];
 643                         j++;
 644                 }
 645
 646                 /* make sure it is a valid IP.  I considered checking the
 647                  * negative connection cache, but this is the wrong place for
 648                  * it.  Maybe only as a hack. After think about it, if all of
 649                  * the IP addresses returned from DNS are dead, what hope does a
 650                  * netbios name lookup have?  The standard reason for falling
 651                  * back to netbios lookups is that our DNS server doesn't know
 652                  * anything about the DC's   -- jerry */
 653
 654                 if (!is_zero_addr(&r->ss)) {
 655                         count++;
 656                         continue;
 657                 }
 658         }
 659
 660         *returned_dclist = dclist;
 661         *return_count = count;
 662
 663         if (count > 0) {
 664                 return NT_STATUS_OK;
 665         }
 666
 667         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 668 }
 669
 670 /****************************************************************
 671 ****************************************************************/
 672
 673 static NTSTATUS make_domain_controller_info(TALLOC_CTX *mem_ctx,
 674                                             const char *dc_unc,
 675                                             const char *dc_address,
 676                                             uint32_t dc_address_type,
 677                                             const struct GUID *domain_guid,
 678                                             const char *domain_name,
 679                                             const char *forest_name,
 680                                             uint32_t flags,
 681                                             const char *dc_site_name,
 682                                             const char *client_site_name,
 683                                             struct netr_DsRGetDCNameInfo **info_out)
 684 {
 685         struct netr_DsRGetDCNameInfo *info;
 686
 687         info = talloc_zero(mem_ctx, struct netr_DsRGetDCNameInfo);
 688         NT_STATUS_HAVE_NO_MEMORY(info);
 689
 690         if (dc_unc) {
 691                 info->dc_unc = talloc_strdup(mem_ctx, dc_unc);
 692                 NT_STATUS_HAVE_NO_MEMORY(info->dc_unc);
 693         }
 694
 695         if (dc_address) {
 696                 if (!(dc_address[0] == '\\' && dc_address[1] == '\\')) {
 697                         info->dc_address = talloc_asprintf(mem_ctx, "\\\\%s",
 698                                                            dc_address);
 699                 } else {
 700                         info->dc_address = talloc_strdup(mem_ctx, dc_address);
 701                 }
 702                 NT_STATUS_HAVE_NO_MEMORY(info->dc_address);
 703         }
 704
 705         info->dc_address_type = dc_address_type;
 706
 707         if (domain_guid) {
 708                 info->domain_guid = *domain_guid;
 709         }
 710
 711         if (domain_name) {
 712                 info->domain_name = talloc_strdup(mem_ctx, domain_name);
 713                 NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
 714         }
 715
 716         if (forest_name && *forest_name) {
 717                 info->forest_name = talloc_strdup(mem_ctx, forest_name);
 718                 NT_STATUS_HAVE_NO_MEMORY(info->forest_name);
 719                 flags |= DS_DNS_FOREST_ROOT;
 720         }
 721
 722         info->dc_flags = flags;
 723
 724         if (dc_site_name) {
 725                 info->dc_site_name = talloc_strdup(mem_ctx, dc_site_name);
 726                 NT_STATUS_HAVE_NO_MEMORY(info->dc_site_name);
 727         }
 728
 729         if (client_site_name) {
 730                 info->client_site_name = talloc_strdup(mem_ctx,
 731                                                        client_site_name);
 732                 NT_STATUS_HAVE_NO_MEMORY(info->client_site_name);
 733         }
 734
 735         *info_out = info;
 736
 737         return NT_STATUS_OK;
 738 }
 739
 740 /****************************************************************
 741 ****************************************************************/
 742
 743 static void map_dc_and_domain_names(uint32_t flags,
 744                                     const char *dc_name,
 745                                     const char *domain_name,
 746                                     const char *dns_dc_name,
 747                                     const char *dns_domain_name,
 748                                     uint32_t *dc_flags,
 749                                     const char **hostname_p,
 750                                     const char **domain_p)
 751 {
 752         switch (flags & 0xf0000000) {
 753                 case DS_RETURN_FLAT_NAME:
 754                         if (dc_name && domain_name &&
 755                             *dc_name && *domain_name) {
 756                                 *hostname_p = dc_name;
 757                                 *domain_p = domain_name;
 758                                 break;
 759                         }
 760                 case DS_RETURN_DNS_NAME:
 761                 default:
 762                         if (dns_dc_name && dns_domain_name &&
 763                             *dns_dc_name && *dns_domain_name) {
 764                                 *hostname_p = dns_dc_name;
 765                                 *domain_p = dns_domain_name;
 766                                 *dc_flags |= DS_DNS_DOMAIN | DS_DNS_CONTROLLER;
 767                                 break;
 768                         }
 769                         if (dc_name && domain_name &&
 770                             *dc_name && *domain_name) {
 771                                 *hostname_p = dc_name;
 772                                 *domain_p = domain_name;
 773                                 break;
 774                         }
 775         }
 776 }
 777
 778 /****************************************************************
 779 ****************************************************************/
 780
 781 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
 782                                               uint32_t flags,
 783                                               struct sockaddr_storage *ss,
 784                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
 785                                               struct netr_DsRGetDCNameInfo **info)
 786 {
 787         const char *dc_hostname = NULL;
 788         const char *dc_domain_name = NULL;
 789         const char *dc_address = NULL;
 790         const char *dc_forest = NULL;
 791         uint32_t dc_address_type = 0;
 792         uint32_t dc_flags = 0;
 793         struct GUID *dc_domain_guid = NULL;
 794         const char *dc_server_site = NULL;
 795         const char *dc_client_site = NULL;
 796
 797         char addr[INET6_ADDRSTRLEN];
 798
 799         if (ss) {
 800                 print_sockaddr(addr, sizeof(addr), ss);
 801                 dc_address = addr;
 802                 dc_address_type = DS_ADDRESS_TYPE_INET;
 803         }
 804
 805         if (!ss && r->sockaddr.pdc_ip) {
 806                 dc_address      = r->sockaddr.pdc_ip;
 807                 dc_address_type = DS_ADDRESS_TYPE_INET;
 808         } else {
 809                 dc_address      = r->pdc_name;
 810                 dc_address_type = DS_ADDRESS_TYPE_NETBIOS;
 811         }
 812
 813         map_dc_and_domain_names(flags,
 814                                 r->pdc_name,
 815                                 r->domain_name,
 816                                 r->pdc_dns_name,
 817                                 r->dns_domain,
 818                                 &dc_flags,
 819                                 &dc_hostname,
 820                                 &dc_domain_name);
 821
 822         dc_flags        |= r->server_type;
 823         dc_forest       = r->forest;
 824         dc_domain_guid  = &r->domain_uuid;
 825         dc_server_site  = r->server_site;
 826         dc_client_site  = r->client_site;
 827
 828         return make_domain_controller_info(mem_ctx,
 829                                            dc_hostname,
 830                                            dc_address,
 831                                            dc_address_type,
 832                                            dc_domain_guid,
 833                                            dc_domain_name,
 834                                            dc_forest,
 835                                            dc_flags,
 836                                            dc_server_site,
 837                                            dc_client_site,
 838                                            info);
 839 }
 840
 841 /****************************************************************
 842 ****************************************************************/
 843
 844 static uint32_t map_ds_flags_to_nt_version(uint32_t flags)
 845 {
 846         uint32_t nt_version = 0;
 847
 848         if (flags & DS_PDC_REQUIRED) {
 849                 nt_version |= NETLOGON_NT_VERSION_PDC;
 850         }
 851
 852         if (flags & DS_GC_SERVER_REQUIRED) {
 853                 nt_version |= NETLOGON_NT_VERSION_GC;
 854         }
 855
 856         if (flags & DS_TRY_NEXTCLOSEST_SITE) {
 857                 nt_version |= NETLOGON_NT_VERSION_WITH_CLOSEST_SITE;
 858         }
 859
 860         if (flags & DS_IP_REQUIRED) {
 861                 nt_version |= NETLOGON_NT_VERSION_IP;
 862         }
 863
 864         return nt_version;
 865 }
 866
 867 /****************************************************************
 868 ****************************************************************/
 869
 870 static NTSTATUS process_dc_dns(TALLOC_CTX *mem_ctx,
 871                                const char *domain_name,
 872                                uint32_t flags,
 873                                struct ip_service_name *dclist,
 874                                int num_dcs,
 875                                struct netr_DsRGetDCNameInfo **info)
 876 {
 877         int i = 0;
 878         bool valid_dc = false;
 879         struct netlogon_samlogon_response *r = NULL;
 880         uint32_t nt_version = NETLOGON_NT_VERSION_5 |
 881                               NETLOGON_NT_VERSION_5EX;
 882         uint32_t ret_flags = 0;
 883         NTSTATUS status;
 884
 885         nt_version |= map_ds_flags_to_nt_version(flags);
 886
 887         for (i=0; i<num_dcs; i++) {
 888
 889                 char addr[INET6_ADDRSTRLEN];
 890                 print_sockaddr(addr, sizeof(addr), &dclist[i].ss);
 891
 892                 DEBUG(10,("LDAP ping to %s (%s)\n", dclist[i].hostname, addr));
 893
 894                 if (ads_cldap_netlogon(mem_ctx, &dclist[i].ss,
 895                                         domain_name,
 896                                         nt_version,
 897                                         &r))
 898                 {
 899                         nt_version = r->ntver;
 900                         ret_flags = get_cldap_reply_server_flags(r, nt_version);
 901
 902                         if (check_cldap_reply_required_flags(ret_flags, flags)) {
 903                                 valid_dc = true;
 904                                 break;
 905                         }
 906                 }
 907
 908                 continue;
 909         }
 910
 911         if (!valid_dc) {
 912                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 913         }
 914
 915         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 916                                                &r->data.nt5_ex, info);
 917         if (NT_STATUS_IS_OK(status)) {
 918                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 919                                          nt_version, &r->data.nt5_ex);
 920         }
 921
 922         return status;
 923 }
 924
 925 /****************************************************************
 926 ****************************************************************/
 927
 928 /****************************************************************
 929 ****************************************************************/
 930
 931 static NTSTATUS process_dc_netbios(TALLOC_CTX *mem_ctx,
 932                                    struct messaging_context *msg_ctx,
 933                                    const char *domain_name,
 934                                    uint32_t flags,
 935                                    struct ip_service_name *dclist,
 936                                    int num_dcs,
 937                                    struct netr_DsRGetDCNameInfo **info)
 938 {
 939         struct sockaddr_storage ss;
 940         struct ip_service ip_list;
 941         enum nbt_name_type name_type = NBT_NAME_LOGON;
 942         NTSTATUS status;
 943         int i;
 944         const char *dc_name = NULL;
 945         fstring tmp_dc_name;
 946         struct netlogon_samlogon_response *r = NULL;
 947         bool store_cache = false;
 948         uint32_t nt_version = NETLOGON_NT_VERSION_1 |
 949                               NETLOGON_NT_VERSION_5 |
 950                               NETLOGON_NT_VERSION_5EX_WITH_IP;
 951
 952         if (msg_ctx == NULL) {
 953                 return NT_STATUS_INVALID_PARAMETER;
 954         }
 955
 956         if (flags & DS_PDC_REQUIRED) {
 957                 name_type = NBT_NAME_PDC;
 958         }
 959
 960         nt_version |= map_ds_flags_to_nt_version(flags);
 961
 962         DEBUG(10,("process_dc_netbios\n"));
 963
 964         for (i=0; i<num_dcs; i++) {
 965                 uint16_t val;
 966
 967                 generate_random_buffer((uint8_t *)&val, 2);
 968
 969                 ip_list.ss = dclist[i].ss;
 970                 ip_list.port = 0;
 971
 972                 if (!interpret_string_addr_prefer_ipv4(&ss, dclist[i].hostname, AI_NUMERICHOST)) {
 973                         return NT_STATUS_UNSUCCESSFUL;
 974                 }
 975
 976                 status = nbt_getdc(msg_ctx, 10, &dclist[i].ss, domain_name,
 977                                    NULL, nt_version,
 978                                    mem_ctx, &nt_version, &dc_name, &r);
 979                 if (NT_STATUS_IS_OK(status)) {
 980                         store_cache = true;
 981                         namecache_store(dc_name, NBT_NAME_SERVER, 1, &ip_list);
 982                         goto make_reply;
 983                 }
 984
 985                 if (name_status_find(domain_name,
 986                                      name_type,
 987                                      NBT_NAME_SERVER,
 988                                      &dclist[i].ss,
 989                                      tmp_dc_name))
 990                 {
 991                         struct NETLOGON_SAM_LOGON_RESPONSE_NT40 logon1;
 992
 993                         r = talloc_zero(mem_ctx, struct netlogon_samlogon_response);
 994                         NT_STATUS_HAVE_NO_MEMORY(r);
 995
 996                         ZERO_STRUCT(logon1);
 997
 998                         nt_version = NETLOGON_NT_VERSION_1;
 999
1000                         logon1.nt_version = nt_version;
1001                         logon1.pdc_name = tmp_dc_name;
1002                         logon1.domain_name = talloc_strdup_upper(mem_ctx, domain_name);
1003                         NT_STATUS_HAVE_NO_MEMORY(logon1.domain_name);
1004
1005                         r->data.nt4 = logon1;
1006                         r->ntver = nt_version;
1007
1008                         map_netlogon_samlogon_response(r);
1009
1010                         namecache_store(tmp_dc_name, NBT_NAME_SERVER, 1, &ip_list);
1011
1012                         goto make_reply;
1013                 }
1014         }
1015
1016         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1017
1018  make_reply:
1019
1020         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1021                                                &r->data.nt5_ex, info);
1022         if (NT_STATUS_IS_OK(status) && store_cache) {
1023                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1024                                          nt_version, &r->data.nt5_ex);
1025         }
1026
1027         return status;
1028 }
1029
1030 /****************************************************************
1031 ****************************************************************/
1032
1033 static NTSTATUS dsgetdcname_rediscover(TALLOC_CTX *mem_ctx,
1034                                        struct messaging_context *msg_ctx,
1035                                        const char *domain_name,
1036                                        const struct GUID *domain_guid,
1037                                        uint32_t flags,
1038                                        const char *site_name,
1039                                        struct netr_DsRGetDCNameInfo **info)
1040 {
1041         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1042         struct ip_service_name *dclist = NULL;
1043         int num_dcs;
1044
1045         DEBUG(10,("dsgetdcname_rediscover\n"));
1046
1047         if (flags & DS_IS_FLAT_NAME) {
1048
1049                 status = discover_dc_netbios(mem_ctx, domain_name, flags,
1050                                              &dclist, &num_dcs);
1051                 NT_STATUS_NOT_OK_RETURN(status);
1052
1053                 return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags,
1054                                           dclist, num_dcs, info);
1055         }
1056
1057         if (flags & DS_IS_DNS_NAME) {
1058
1059                 status = discover_dc_dns(mem_ctx, domain_name, domain_guid,
1060                                          flags, site_name, &dclist, &num_dcs);
1061                 NT_STATUS_NOT_OK_RETURN(status);
1062
1063                 return process_dc_dns(mem_ctx, domain_name, flags,
1064                                       dclist, num_dcs, info);
1065         }
1066
1067         status = discover_dc_dns(mem_ctx, domain_name, domain_guid, flags,
1068                                  site_name, &dclist, &num_dcs);
1069
1070         if (NT_STATUS_IS_OK(status) && num_dcs != 0) {
1071
1072                 status = process_dc_dns(mem_ctx, domain_name, flags, dclist,
1073                                         num_dcs, info);
1074                 if (NT_STATUS_IS_OK(status)) {
1075                         return status;
1076                 }
1077         }
1078
1079         status = discover_dc_netbios(mem_ctx, domain_name, flags, &dclist,
1080                                      &num_dcs);
1081         NT_STATUS_NOT_OK_RETURN(status);
1082
1083         return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags, dclist,
1084                                   num_dcs, info);
1085 }
1086
1087 static bool is_closest_site(struct netr_DsRGetDCNameInfo *info)
1088 {
1089         if (info->dc_flags & DS_SERVER_CLOSEST) {
1090                 return true;
1091         }
1092
1093         if (!info->client_site_name) {
1094                 return true;
1095         }
1096
1097         if (!info->dc_site_name) {
1098                 return false;
1099         }
1100
1101         if (strcmp(info->client_site_name, info->dc_site_name) == 0) {
1102                 return true;
1103         }
1104
1105         return false;
1106 }
1107
1108 /********************************************************************
1109  Internal dsgetdcname.
1110 ********************************************************************/
1111
1112 static NTSTATUS dsgetdcname_internal(TALLOC_CTX *mem_ctx,
1113                      struct messaging_context *msg_ctx,
1114                      const char *domain_name,
1115                      const struct GUID *domain_guid,
1116                      const char *site_name,
1117                      uint32_t flags,
1118                      struct netr_DsRGetDCNameInfo **info)
1119 {
1120         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1121         struct netr_DsRGetDCNameInfo *myinfo = NULL;
1122         bool first = true;
1123         struct netr_DsRGetDCNameInfo *first_info = NULL;
1124
1125         DEBUG(10,("dsgetdcname_internal: domain_name: %s, "
1126                   "domain_guid: %s, site_name: %s, flags: 0x%08x\n",
1127                   domain_name,
1128                   domain_guid ? GUID_string(mem_ctx, domain_guid) : "(null)",
1129                   site_name ? site_name : "(null)", flags));
1130
1131         *info = NULL;
1132
1133         if (!check_allowed_required_flags(flags, site_name)) {
1134                 DEBUG(0,("invalid flags specified\n"));
1135                 return NT_STATUS_INVALID_PARAMETER;
1136         }
1137
1138         if (flags & DS_FORCE_REDISCOVERY) {
1139                 goto rediscover;
1140         }
1141
1142         status = dsgetdcname_cached(mem_ctx, msg_ctx, domain_name, domain_guid,
1143                                     flags, site_name, &myinfo);
1144         if (NT_STATUS_IS_OK(status)) {
1145                 goto done;
1146         }
1147
1148         if (flags & DS_BACKGROUND_ONLY) {
1149                 goto done;
1150         }
1151
1152  rediscover:
1153         status = dsgetdcname_rediscover(mem_ctx, msg_ctx, domain_name,
1154                                         domain_guid, flags, site_name,
1155                                         &myinfo);
1156
1157  done:
1158         if (!NT_STATUS_IS_OK(status)) {
1159                 if (!first) {
1160                         *info = first_info;
1161                         return NT_STATUS_OK;
1162                 }
1163                 return status;
1164         }
1165
1166         if (!first) {
1167                 TALLOC_FREE(first_info);
1168         } else if (!is_closest_site(myinfo)) {
1169                 first = false;
1170                 first_info = myinfo;
1171                 /* TODO: may use the next_closest_site here */
1172                 site_name = myinfo->client_site_name;
1173                 goto rediscover;
1174         }
1175
1176         *info = myinfo;
1177         return NT_STATUS_OK;
1178 }
1179
1180 /********************************************************************
1181  dsgetdcname.
1182
1183  This will be the only public function here.
1184 ********************************************************************/
1185
1186 NTSTATUS dsgetdcname(TALLOC_CTX *mem_ctx,
1187                      struct messaging_context *msg_ctx,
1188                      const char *domain_name,
1189                      const struct GUID *domain_guid,
1190                      const char *site_name,
1191                      uint32_t flags,
1192                      struct netr_DsRGetDCNameInfo **info)
1193 {
1194         NTSTATUS status;
1195         const char *query_site = NULL;
1196         char *ptr_to_free = NULL;
1197         bool retry_query_with_null = false;
1198
1199         if ((site_name == NULL) || (site_name[0] == '\0')) {
1200                 ptr_to_free = sitename_fetch(mem_ctx, domain_name);
1201                 if (ptr_to_free != NULL) {
1202                         retry_query_with_null = true;
1203                 }
1204                 query_site = ptr_to_free;
1205         } else {
1206                 query_site = site_name;
1207         }
1208
1209         status = dsgetdcname_internal(mem_ctx,
1210                                 msg_ctx,
1211                                 domain_name,
1212                                 domain_guid,
1213                                 query_site,
1214                                 flags,
1215                                 info);
1216
1217         TALLOC_FREE(ptr_to_free);
1218
1219         if (!NT_STATUS_EQUAL(status, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND)) {
1220                 return status;
1221         }
1222
1223         /* Should we try again with site_name == NULL ? */
1224         if (retry_query_with_null) {
1225                 status = dsgetdcname_internal(mem_ctx,
1226                                         msg_ctx,
1227                                         domain_name,
1228                                         domain_guid,
1229                                         NULL,
1230                                         flags,
1231                                         info);
1232         }
1233
1234         return status;
1235 }