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
  25 #define DSGETDCNAME_FMT "DSGETDCNAME/DOMAIN/%s"
  26 /* 15 minutes */
  27 #define DSGETDCNAME_CACHE_TTL   60*15
  28
  29 struct ip_service_name {
  30         struct sockaddr_storage ss;
  31         unsigned port;
  32         const char *hostname;
  33 };
  34
  35 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
  36                                               uint32_t flags,
  37                                               struct sockaddr_storage *ss,
  38                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
  39                                               struct netr_DsRGetDCNameInfo **info);
  40
  41 /****************************************************************
  42 ****************************************************************/
  43
  44 void debug_dsdcinfo_flags(int lvl, uint32_t flags)
  45 {
  46         DEBUG(lvl,("debug_dsdcinfo_flags: 0x%08x\n\t", flags));
  47
  48         if (flags & DS_FORCE_REDISCOVERY)
  49                 DEBUGADD(lvl,("DS_FORCE_REDISCOVERY "));
  50         if (flags & 0x000000002)
  51                 DEBUGADD(lvl,("0x00000002 "));
  52         if (flags & 0x000000004)
  53                 DEBUGADD(lvl,("0x00000004 "));
  54         if (flags & 0x000000008)
  55                 DEBUGADD(lvl,("0x00000008 "));
  56         if (flags & DS_DIRECTORY_SERVICE_REQUIRED)
  57                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_REQUIRED "));
  58         if (flags & DS_DIRECTORY_SERVICE_PREFERRED)
  59                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_PREFERRED "));
  60         if (flags & DS_GC_SERVER_REQUIRED)
  61                 DEBUGADD(lvl,("DS_GC_SERVER_REQUIRED "));
  62         if (flags & DS_PDC_REQUIRED)
  63                 DEBUGADD(lvl,("DS_PDC_REQUIRED "));
  64         if (flags & DS_BACKGROUND_ONLY)
  65                 DEBUGADD(lvl,("DS_BACKGROUND_ONLY "));
  66         if (flags & DS_IP_REQUIRED)
  67                 DEBUGADD(lvl,("DS_IP_REQUIRED "));
  68         if (flags & DS_KDC_REQUIRED)
  69                 DEBUGADD(lvl,("DS_KDC_REQUIRED "));
  70         if (flags & DS_TIMESERV_REQUIRED)
  71                 DEBUGADD(lvl,("DS_TIMESERV_REQUIRED "));
  72         if (flags & DS_WRITABLE_REQUIRED)
  73                 DEBUGADD(lvl,("DS_WRITABLE_REQUIRED "));
  74         if (flags & DS_GOOD_TIMESERV_PREFERRED)
  75                 DEBUGADD(lvl,("DS_GOOD_TIMESERV_PREFERRED "));
  76         if (flags & DS_AVOID_SELF)
  77                 DEBUGADD(lvl,("DS_AVOID_SELF "));
  78         if (flags & DS_ONLY_LDAP_NEEDED)
  79                 DEBUGADD(lvl,("DS_ONLY_LDAP_NEEDED "));
  80         if (flags & DS_IS_FLAT_NAME)
  81                 DEBUGADD(lvl,("DS_IS_FLAT_NAME "));
  82         if (flags & DS_IS_DNS_NAME)
  83                 DEBUGADD(lvl,("DS_IS_DNS_NAME "));
  84         if (flags & 0x00040000)
  85                 DEBUGADD(lvl,("0x00040000 "));
  86         if (flags & 0x00080000)
  87                 DEBUGADD(lvl,("0x00080000 "));
  88         if (flags & 0x00100000)
  89                 DEBUGADD(lvl,("0x00100000 "));
  90         if (flags & 0x00200000)
  91                 DEBUGADD(lvl,("0x00200000 "));
  92         if (flags & 0x00400000)
  93                 DEBUGADD(lvl,("0x00400000 "));
  94         if (flags & 0x00800000)
  95                 DEBUGADD(lvl,("0x00800000 "));
  96         if (flags & 0x01000000)
  97                 DEBUGADD(lvl,("0x01000000 "));
  98         if (flags & 0x02000000)
  99                 DEBUGADD(lvl,("0x02000000 "));
 100         if (flags & 0x04000000)
 101                 DEBUGADD(lvl,("0x04000000 "));
 102         if (flags & 0x08000000)
 103                 DEBUGADD(lvl,("0x08000000 "));
 104         if (flags & 0x10000000)
 105                 DEBUGADD(lvl,("0x10000000 "));
 106         if (flags & 0x20000000)
 107                 DEBUGADD(lvl,("0x20000000 "));
 108         if (flags & DS_RETURN_DNS_NAME)
 109                 DEBUGADD(lvl,("DS_RETURN_DNS_NAME "));
 110         if (flags & DS_RETURN_FLAT_NAME)
 111                 DEBUGADD(lvl,("DS_RETURN_FLAT_NAME "));
 112         if (flags)
 113                 DEBUGADD(lvl,("\n"));
 114 }
 115
 116 /****************************************************************
 117 ****************************************************************/
 118
 119 static char *dsgetdcname_cache_key(TALLOC_CTX *mem_ctx, const char *domain)
 120 {
 121         if (!domain) {
 122                 return NULL;
 123         }
 124
 125         return talloc_asprintf_strupper_m(mem_ctx, DSGETDCNAME_FMT, domain);
 126 }
 127
 128 /****************************************************************
 129 ****************************************************************/
 130
 131 static NTSTATUS dsgetdcname_cache_delete(TALLOC_CTX *mem_ctx,
 132                                         const char *domain_name)
 133 {
 134         char *key;
 135
 136         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 137         if (!key) {
 138                 return NT_STATUS_NO_MEMORY;
 139         }
 140
 141         if (!gencache_del(key)) {
 142                 return NT_STATUS_UNSUCCESSFUL;
 143         }
 144
 145         return NT_STATUS_OK;
 146 }
 147
 148 /****************************************************************
 149 ****************************************************************/
 150
 151 static NTSTATUS dsgetdcname_cache_store(TALLOC_CTX *mem_ctx,
 152                                         const char *domain_name,
 153                                         const DATA_BLOB *blob)
 154 {
 155         time_t expire_time;
 156         char *key;
 157         bool ret = false;
 158
 159         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 160         if (!key) {
 161                 return NT_STATUS_NO_MEMORY;
 162         }
 163
 164         expire_time = time(NULL) + DSGETDCNAME_CACHE_TTL;
 165
 166         ret = gencache_set_data_blob(key, blob, expire_time);
 167
 168         return ret ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
 169 }
 170
 171 /****************************************************************
 172 ****************************************************************/
 173
 174 static NTSTATUS store_cldap_reply(TALLOC_CTX *mem_ctx,
 175                                   uint32_t flags,
 176                                   struct sockaddr_storage *ss,
 177                                   uint32_t nt_version,
 178                                   struct NETLOGON_SAM_LOGON_RESPONSE_EX *r)
 179 {
 180         DATA_BLOB blob;
 181         enum ndr_err_code ndr_err;
 182         NTSTATUS status;
 183         char addr[INET6_ADDRSTRLEN];
 184
 185        print_sockaddr(addr, sizeof(addr), ss);
 186
 187         /* FIXME */
 188         r->sockaddr_size = 0x10; /* the w32 winsock addr size */
 189         r->sockaddr.sockaddr_family = 2; /* AF_INET */
 190         r->sockaddr.pdc_ip = talloc_strdup(mem_ctx, addr);
 191
 192         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, NULL, r,
 193                        (ndr_push_flags_fn_t)ndr_push_NETLOGON_SAM_LOGON_RESPONSE_EX);
 194         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 195                 return ndr_map_error2ntstatus(ndr_err);
 196         }
 197
 198         if (r->domain) {
 199                 status = dsgetdcname_cache_store(mem_ctx, r->domain, &blob);
 200                 if (!NT_STATUS_IS_OK(status)) {
 201                         goto done;
 202                 }
 203                 if (r->client_site) {
 204                         sitename_store(r->domain, r->client_site);
 205                 }
 206         }
 207         if (r->dns_domain) {
 208                 status = dsgetdcname_cache_store(mem_ctx, r->dns_domain, &blob);
 209                 if (!NT_STATUS_IS_OK(status)) {
 210                         goto done;
 211                 }
 212                 if (r->client_site) {
 213                         sitename_store(r->dns_domain, r->client_site);
 214                 }
 215         }
 216
 217         status = NT_STATUS_OK;
 218
 219  done:
 220         data_blob_free(&blob);
 221
 222         return status;
 223 }
 224
 225 /****************************************************************
 226 ****************************************************************/
 227
 228 static uint32_t get_cldap_reply_server_flags(struct netlogon_samlogon_response *r,
 229                                              uint32_t nt_version)
 230 {
 231         switch (nt_version & 0x0000001f) {
 232                 case 0:
 233                 case 1:
 234                 case 16:
 235                 case 17:
 236                         return 0;
 237                 case 2:
 238                 case 3:
 239                 case 18:
 240                 case 19:
 241                         return r->data.nt5.server_type;
 242                 case 4:
 243                 case 5:
 244                 case 6:
 245                 case 7:
 246                         return r->data.nt5_ex.server_type;
 247                 case 8:
 248                 case 9:
 249                 case 10:
 250                 case 11:
 251                 case 12:
 252                 case 13:
 253                 case 14:
 254                 case 15:
 255                         return r->data.nt5_ex.server_type;
 256                 case 20:
 257                 case 21:
 258                 case 22:
 259                 case 23:
 260                 case 24:
 261                 case 25:
 262                 case 26:
 263                 case 27:
 264                 case 28:
 265                         return r->data.nt5_ex.server_type;
 266                 case 29:
 267                 case 30:
 268                 case 31:
 269                         return r->data.nt5_ex.server_type;
 270                 default:
 271                         return 0;
 272         }
 273 }
 274
 275 /****************************************************************
 276 ****************************************************************/
 277
 278 #define RETURN_ON_FALSE(x) if (!(x)) return false;
 279
 280 static bool check_cldap_reply_required_flags(uint32_t ret_flags,
 281                                              uint32_t req_flags)
 282 {
 283         if (ret_flags == 0) {
 284                 return true;
 285         }
 286
 287         if (req_flags & DS_PDC_REQUIRED)
 288                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_PDC);
 289
 290         if (req_flags & DS_GC_SERVER_REQUIRED)
 291                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_GC);
 292
 293         if (req_flags & DS_ONLY_LDAP_NEEDED)
 294                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_LDAP);
 295
 296         if ((req_flags & DS_DIRECTORY_SERVICE_REQUIRED) ||
 297             (req_flags & DS_DIRECTORY_SERVICE_PREFERRED))
 298                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_DS);
 299
 300         if (req_flags & DS_KDC_REQUIRED)
 301                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_KDC);
 302
 303         if (req_flags & DS_TIMESERV_REQUIRED)
 304                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_TIMESERV);
 305
 306         if (req_flags & DS_WRITABLE_REQUIRED)
 307                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_WRITABLE);
 308
 309         return true;
 310 }
 311
 312 /****************************************************************
 313 ****************************************************************/
 314
 315 static NTSTATUS dsgetdcname_cache_fetch(TALLOC_CTX *mem_ctx,
 316                                         const char *domain_name,
 317                                         struct GUID *domain_guid,
 318                                         uint32_t flags,
 319                                         const char *site_name,
 320                                         struct netr_DsRGetDCNameInfo **info_p)
 321 {
 322         char *key;
 323         DATA_BLOB blob;
 324         enum ndr_err_code ndr_err;
 325         struct netr_DsRGetDCNameInfo *info;
 326         struct NETLOGON_SAM_LOGON_RESPONSE_EX r;
 327         NTSTATUS status;
 328
 329         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 330         if (!key) {
 331                 return NT_STATUS_NO_MEMORY;
 332         }
 333
 334         if (!gencache_get_data_blob(key, &blob, NULL)) {
 335                 return NT_STATUS_NOT_FOUND;
 336         }
 337
 338         info = TALLOC_ZERO_P(mem_ctx, struct netr_DsRGetDCNameInfo);
 339         if (!info) {
 340                 return NT_STATUS_NO_MEMORY;
 341         }
 342
 343         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, NULL, &r,
 344                       (ndr_pull_flags_fn_t)ndr_pull_NETLOGON_SAM_LOGON_RESPONSE_EX);
 345
 346         data_blob_free(&blob);
 347         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 348                 dsgetdcname_cache_delete(mem_ctx, domain_name);
 349                 return ndr_map_error2ntstatus(ndr_err);
 350         }
 351
 352         status = make_dc_info_from_cldap_reply(mem_ctx, flags, NULL,
 353                                                &r, &info);
 354         if (!NT_STATUS_IS_OK(status)) {
 355                 return status;
 356         }
 357
 358         if (DEBUGLEVEL >= 10) {
 359                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, info);
 360         }
 361
 362         /* check flags */
 363         if (!check_cldap_reply_required_flags(info->dc_flags, flags)) {
 364                 DEBUG(10,("invalid flags\n"));
 365                 return NT_STATUS_INVALID_PARAMETER;
 366         }
 367
 368         if ((flags & DS_IP_REQUIRED) &&
 369             (info->dc_address_type != DS_ADDRESS_TYPE_INET)) {
 370                 return NT_STATUS_INVALID_PARAMETER_MIX;
 371         }
 372
 373         *info_p = info;
 374
 375         return NT_STATUS_OK;
 376 }
 377
 378 /****************************************************************
 379 ****************************************************************/
 380
 381 static NTSTATUS dsgetdcname_cached(TALLOC_CTX *mem_ctx,
 382                                    struct messaging_context *msg_ctx,
 383                                    const char *domain_name,
 384                                    struct GUID *domain_guid,
 385                                    uint32_t flags,
 386                                    const char *site_name,
 387                                    struct netr_DsRGetDCNameInfo **info)
 388 {
 389         NTSTATUS status;
 390
 391         status = dsgetdcname_cache_fetch(mem_ctx, domain_name, domain_guid,
 392                                          flags, site_name, info);
 393         if (!NT_STATUS_IS_OK(status)
 394             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 395                 DEBUG(10,("dsgetdcname_cached: cache fetch failed with: %s\n",
 396                         nt_errstr(status)));
 397                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 398         }
 399
 400         if (flags & DS_BACKGROUND_ONLY) {
 401                 return status;
 402         }
 403
 404         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 405                 struct netr_DsRGetDCNameInfo *dc_info;
 406
 407                 status = dsgetdcname(mem_ctx, msg_ctx, domain_name,
 408                                      domain_guid, site_name,
 409                                      flags | DS_FORCE_REDISCOVERY,
 410                                      &dc_info);
 411
 412                 if (!NT_STATUS_IS_OK(status)) {
 413                         return status;
 414                 }
 415         }
 416
 417         return status;
 418 }
 419
 420 /****************************************************************
 421 ****************************************************************/
 422
 423 static bool check_allowed_required_flags(uint32_t flags,
 424                                          const char *site_name)
 425 {
 426         uint32_t return_type = flags & (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME);
 427         uint32_t offered_type = flags & (DS_IS_FLAT_NAME|DS_IS_DNS_NAME);
 428         uint32_t query_type = flags & (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY);
 429
 430         /* FIXME: check for DSGETDC_VALID_FLAGS and check for excluse bits
 431          * (DS_PDC_REQUIRED, DS_KDC_REQUIRED, DS_GC_SERVER_REQUIRED) */
 432
 433         debug_dsdcinfo_flags(10, flags);
 434
 435         if ((flags & DS_TRY_NEXTCLOSEST_SITE) && site_name) {
 436                 return false;
 437         }
 438
 439         if (return_type == (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME)) {
 440                 return false;
 441         }
 442
 443         if (offered_type == (DS_IS_DNS_NAME|DS_IS_FLAT_NAME)) {
 444                 return false;
 445         }
 446
 447         if (query_type == (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY)) {
 448                 return false;
 449         }
 450
 451 #if 0
 452         if ((flags & DS_RETURN_DNS_NAME) && (!(flags & DS_IP_REQUIRED))) {
 453                 printf("gd: here5 \n");
 454                 return false;
 455         }
 456 #endif
 457         return true;
 458 }
 459
 460 /****************************************************************
 461 ****************************************************************/
 462
 463 static NTSTATUS discover_dc_netbios(TALLOC_CTX *mem_ctx,
 464                                     const char *domain_name,
 465                                     uint32_t flags,
 466                                     struct ip_service_name **returned_dclist,
 467                                     int *returned_count)
 468 {
 469         NTSTATUS status;
 470         enum nbt_name_type name_type = NBT_NAME_LOGON;
 471         struct ip_service *iplist;
 472         int i;
 473         struct ip_service_name *dclist = NULL;
 474         int count;
 475
 476         *returned_dclist = NULL;
 477         *returned_count = 0;
 478
 479         if (lp_disable_netbios()) {
 480                 return NT_STATUS_NOT_SUPPORTED;
 481         }
 482
 483         if (flags & DS_PDC_REQUIRED) {
 484                 name_type = NBT_NAME_PDC;
 485         }
 486
 487         status = internal_resolve_name(domain_name, name_type, NULL,
 488                                        &iplist, &count,
 489                                        "lmhosts wins bcast");
 490         if (!NT_STATUS_IS_OK(status)) {
 491                 DEBUG(10,("discover_dc_netbios: failed to find DC\n"));
 492                 return status;
 493         }
 494
 495         dclist = TALLOC_ZERO_ARRAY(mem_ctx, struct ip_service_name, count);
 496         if (!dclist) {
 497                 return NT_STATUS_NO_MEMORY;
 498         }
 499
 500         for (i=0; i<count; i++) {
 501
 502                 char addr[INET6_ADDRSTRLEN];
 503                 struct ip_service_name *r = &dclist[i];
 504
 505                 print_sockaddr(addr, sizeof(addr),
 506                                &iplist[i].ss);
 507
 508                 r->ss   = iplist[i].ss;
 509                 r->port = iplist[i].port;
 510                 r->hostname = talloc_strdup(mem_ctx, addr);
 511                 if (!r->hostname) {
 512                         return NT_STATUS_NO_MEMORY;
 513                 }
 514
 515         }
 516
 517         *returned_dclist = dclist;
 518         *returned_count = count;
 519
 520         return NT_STATUS_OK;
 521 }
 522
 523 /****************************************************************
 524 ****************************************************************/
 525
 526 static NTSTATUS discover_dc_dns(TALLOC_CTX *mem_ctx,
 527                                 const char *domain_name,
 528                                 struct GUID *domain_guid,
 529                                 uint32_t flags,
 530                                 const char *site_name,
 531                                 struct ip_service_name **returned_dclist,
 532                                 int *return_count)
 533 {
 534         int i, j;
 535         NTSTATUS status;
 536         struct dns_rr_srv *dcs = NULL;
 537         int numdcs = 0;
 538         int numaddrs = 0;
 539         struct ip_service_name *dclist = NULL;
 540         int count = 0;
 541
 542         if (flags & DS_PDC_REQUIRED) {
 543                 status = ads_dns_query_pdc(mem_ctx, domain_name,
 544                                            &dcs, &numdcs);
 545         } else if (flags & DS_GC_SERVER_REQUIRED) {
 546                 status = ads_dns_query_gcs(mem_ctx, domain_name, site_name,
 547                                            &dcs, &numdcs);
 548         } else if (flags & DS_KDC_REQUIRED) {
 549                 status = ads_dns_query_kdcs(mem_ctx, domain_name, site_name,
 550                                             &dcs, &numdcs);
 551         } else if (flags & DS_DIRECTORY_SERVICE_REQUIRED) {
 552                 status = ads_dns_query_dcs(mem_ctx, domain_name, site_name,
 553                                            &dcs, &numdcs);
 554         } else if (domain_guid) {
 555                 status = ads_dns_query_dcs_guid(mem_ctx, domain_name,
 556                                                 domain_guid, &dcs, &numdcs);
 557         } else {
 558                 status = ads_dns_query_dcs(mem_ctx, domain_name, site_name,
 559                                            &dcs, &numdcs);
 560         }
 561
 562         if (!NT_STATUS_IS_OK(status)) {
 563                 return status;
 564         }
 565
 566         if (numdcs == 0) {
 567                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 568         }
 569
 570         for (i=0;i<numdcs;i++) {
 571                 numaddrs += MAX(dcs[i].num_ips,1);
 572         }
 573
 574         dclist = TALLOC_ZERO_ARRAY(mem_ctx,
 575                                    struct ip_service_name,
 576                                    numaddrs);
 577         if (!dclist) {
 578                 return NT_STATUS_NO_MEMORY;
 579         }
 580
 581         /* now unroll the list of IP addresses */
 582
 583         *return_count = 0;
 584         i = 0;
 585         j = 0;
 586
 587         while ((i < numdcs) && (count < numaddrs)) {
 588
 589                 struct ip_service_name *r = &dclist[count];
 590
 591                 r->port = dcs[i].port;
 592                 r->hostname = dcs[i].hostname;
 593
 594                 /* If we don't have an IP list for a name, lookup it up */
 595
 596                 if (!dcs[i].ss_s) {
 597                         interpret_string_addr_prefer_ipv4(&r->ss,
 598                                                 dcs[i].hostname, 0);
 599                         i++;
 600                         j = 0;
 601                 } else {
 602                         /* use the IP addresses from the SRV sresponse */
 603
 604                         if (j >= dcs[i].num_ips) {
 605                                 i++;
 606                                 j = 0;
 607                                 continue;
 608                         }
 609
 610                         r->ss = dcs[i].ss_s[j];
 611                         j++;
 612                 }
 613
 614                 /* make sure it is a valid IP.  I considered checking the
 615                  * negative connection cache, but this is the wrong place for
 616                  * it.  Maybe only as a hac.  After think about it, if all of
 617                  * the IP addresses retuend from DNS are dead, what hope does a
 618                  * netbios name lookup have?  The standard reason for falling
 619                  * back to netbios lookups is that our DNS server doesn't know
 620                  * anything about the DC's   -- jerry */
 621
 622                 if (!is_zero_addr((struct sockaddr *)(void *)&r->ss)) {
 623                         count++;
 624                         continue;
 625                 }
 626         }
 627
 628         *returned_dclist = dclist;
 629         *return_count = count;
 630
 631         if (count > 0) {
 632                 return NT_STATUS_OK;
 633         }
 634
 635         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 636 }
 637
 638 /****************************************************************
 639 ****************************************************************/
 640
 641 static NTSTATUS make_domain_controller_info(TALLOC_CTX *mem_ctx,
 642                                             const char *dc_unc,
 643                                             const char *dc_address,
 644                                             uint32_t dc_address_type,
 645                                             const struct GUID *domain_guid,
 646                                             const char *domain_name,
 647                                             const char *forest_name,
 648                                             uint32_t flags,
 649                                             const char *dc_site_name,
 650                                             const char *client_site_name,
 651                                             struct netr_DsRGetDCNameInfo **info_out)
 652 {
 653         struct netr_DsRGetDCNameInfo *info;
 654
 655         info = TALLOC_ZERO_P(mem_ctx, struct netr_DsRGetDCNameInfo);
 656         NT_STATUS_HAVE_NO_MEMORY(info);
 657
 658         if (dc_unc) {
 659                 info->dc_unc = talloc_strdup(mem_ctx, dc_unc);
 660                 NT_STATUS_HAVE_NO_MEMORY(info->dc_unc);
 661         }
 662
 663         if (dc_address) {
 664                 if (!(dc_address[0] == '\\' && dc_address[1] == '\\')) {
 665                         info->dc_address = talloc_asprintf(mem_ctx, "\\\\%s",
 666                                                            dc_address);
 667                 } else {
 668                         info->dc_address = talloc_strdup(mem_ctx, dc_address);
 669                 }
 670                 NT_STATUS_HAVE_NO_MEMORY(info->dc_address);
 671         }
 672
 673         info->dc_address_type = dc_address_type;
 674
 675         if (domain_guid) {
 676                 info->domain_guid = *domain_guid;
 677         }
 678
 679         if (domain_name) {
 680                 info->domain_name = talloc_strdup(mem_ctx, domain_name);
 681                 NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
 682         }
 683
 684         if (forest_name && *forest_name) {
 685                 info->forest_name = talloc_strdup(mem_ctx, forest_name);
 686                 NT_STATUS_HAVE_NO_MEMORY(info->forest_name);
 687                 flags |= DS_DNS_FOREST;
 688         }
 689
 690         info->dc_flags = flags;
 691
 692         if (dc_site_name) {
 693                 info->dc_site_name = talloc_strdup(mem_ctx, dc_site_name);
 694                 NT_STATUS_HAVE_NO_MEMORY(info->dc_site_name);
 695         }
 696
 697         if (client_site_name) {
 698                 info->client_site_name = talloc_strdup(mem_ctx,
 699                                                        client_site_name);
 700                 NT_STATUS_HAVE_NO_MEMORY(info->client_site_name);
 701         }
 702
 703         *info_out = info;
 704
 705         return NT_STATUS_OK;
 706 }
 707
 708 /****************************************************************
 709 ****************************************************************/
 710
 711 static void map_dc_and_domain_names(uint32_t flags,
 712                                     const char *dc_name,
 713                                     const char *domain_name,
 714                                     const char *dns_dc_name,
 715                                     const char *dns_domain_name,
 716                                     uint32_t *dc_flags,
 717                                     const char **hostname_p,
 718                                     const char **domain_p)
 719 {
 720         switch (flags & 0xf0000000) {
 721                 case DS_RETURN_FLAT_NAME:
 722                         if (dc_name && domain_name &&
 723                             *dc_name && *domain_name) {
 724                                 *hostname_p = dc_name;
 725                                 *domain_p = domain_name;
 726                                 break;
 727                         }
 728                 case DS_RETURN_DNS_NAME:
 729                 default:
 730                         if (dns_dc_name && dns_domain_name &&
 731                             *dns_dc_name && *dns_domain_name) {
 732                                 *hostname_p = dns_dc_name;
 733                                 *domain_p = dns_domain_name;
 734                                 *dc_flags |= DS_DNS_DOMAIN | DS_DNS_CONTROLLER;
 735                                 break;
 736                         }
 737                         if (dc_name && domain_name &&
 738                             *dc_name && *domain_name) {
 739                                 *hostname_p = dc_name;
 740                                 *domain_p = domain_name;
 741                                 break;
 742                         }
 743         }
 744 }
 745
 746 /****************************************************************
 747 ****************************************************************/
 748
 749 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
 750                                               uint32_t flags,
 751                                               struct sockaddr_storage *ss,
 752                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
 753                                               struct netr_DsRGetDCNameInfo **info)
 754 {
 755         const char *dc_hostname = NULL;
 756         const char *dc_domain_name = NULL;
 757         const char *dc_address = NULL;
 758         const char *dc_forest = NULL;
 759         uint32_t dc_address_type = 0;
 760         uint32_t dc_flags = 0;
 761         struct GUID *dc_domain_guid = NULL;
 762         const char *dc_server_site = NULL;
 763         const char *dc_client_site = NULL;
 764
 765         char addr[INET6_ADDRSTRLEN];
 766
 767         if (ss) {
 768                 print_sockaddr(addr, sizeof(addr), ss);
 769                 dc_address = addr;
 770                 dc_address_type = DS_ADDRESS_TYPE_INET;
 771         }
 772
 773         if (!ss && r->sockaddr.pdc_ip) {
 774                 dc_address      = r->sockaddr.pdc_ip;
 775                 dc_address_type = DS_ADDRESS_TYPE_INET;
 776         } else {
 777                 dc_address      = r->pdc_name;
 778                 dc_address_type = DS_ADDRESS_TYPE_NETBIOS;
 779         }
 780
 781         map_dc_and_domain_names(flags,
 782                                 r->pdc_name,
 783                                 r->domain,
 784                                 r->pdc_dns_name,
 785                                 r->dns_domain,
 786                                 &dc_flags,
 787                                 &dc_hostname,
 788                                 &dc_domain_name);
 789
 790         dc_flags        |= r->server_type;
 791         dc_forest       = r->forest;
 792         dc_domain_guid  = &r->domain_uuid;
 793         dc_server_site  = r->server_site;
 794         dc_client_site  = r->client_site;
 795
 796         return make_domain_controller_info(mem_ctx,
 797                                            dc_hostname,
 798                                            dc_address,
 799                                            dc_address_type,
 800                                            dc_domain_guid,
 801                                            dc_domain_name,
 802                                            dc_forest,
 803                                            dc_flags,
 804                                            dc_server_site,
 805                                            dc_client_site,
 806                                            info);
 807 }
 808
 809 /****************************************************************
 810 ****************************************************************/
 811
 812 static uint32_t map_ds_flags_to_nt_version(uint32_t flags)
 813 {
 814         uint32_t nt_version = 0;
 815
 816         if (flags & DS_PDC_REQUIRED) {
 817                 nt_version |= NETLOGON_NT_VERSION_PDC;
 818         }
 819
 820         if (flags & DS_GC_SERVER_REQUIRED) {
 821                 nt_version |= NETLOGON_NT_VERSION_GC;
 822         }
 823
 824         if (flags & DS_TRY_NEXTCLOSEST_SITE) {
 825                 nt_version |= NETLOGON_NT_VERSION_WITH_CLOSEST_SITE;
 826         }
 827
 828         if (flags & DS_IP_REQUIRED) {
 829                 nt_version |= NETLOGON_NT_VERSION_IP;
 830         }
 831
 832         return nt_version;
 833 }
 834
 835 /****************************************************************
 836 ****************************************************************/
 837
 838 static NTSTATUS process_dc_dns(TALLOC_CTX *mem_ctx,
 839                                const char *domain_name,
 840                                uint32_t flags,
 841                                struct ip_service_name *dclist,
 842                                int num_dcs,
 843                                struct netr_DsRGetDCNameInfo **info)
 844 {
 845         int i = 0;
 846         bool valid_dc = false;
 847         struct netlogon_samlogon_response *r = NULL;
 848         uint32_t nt_version = NETLOGON_NT_VERSION_5 |
 849                               NETLOGON_NT_VERSION_5EX;
 850         uint32_t ret_flags = 0;
 851         NTSTATUS status;
 852
 853         nt_version |= map_ds_flags_to_nt_version(flags);
 854
 855         for (i=0; i<num_dcs; i++) {
 856
 857                 DEBUG(10,("LDAP ping to %s\n", dclist[i].hostname));
 858
 859                 if (ads_cldap_netlogon(mem_ctx, dclist[i].hostname,
 860                                         domain_name,
 861                                         nt_version,
 862                                         &r))
 863                 {
 864                         nt_version = r->ntver;
 865                         ret_flags = get_cldap_reply_server_flags(r, nt_version);
 866
 867                         if (check_cldap_reply_required_flags(ret_flags, flags)) {
 868                                 valid_dc = true;
 869                                 break;
 870                         }
 871                 }
 872
 873                 continue;
 874         }
 875
 876         if (!valid_dc) {
 877                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 878         }
 879
 880         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 881                                                &r->data.nt5_ex, info);
 882         if (NT_STATUS_IS_OK(status)) {
 883                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 884                                          nt_version, &r->data.nt5_ex);
 885         }
 886
 887         return status;
 888 }
 889
 890 /****************************************************************
 891 ****************************************************************/
 892
 893 static struct event_context *ev_context(void)
 894 {
 895         static struct event_context *ctx;
 896
 897         if (!ctx && !(ctx = event_context_init(NULL))) {
 898                 smb_panic("Could not init event context");
 899         }
 900         return ctx;
 901 }
 902
 903 /****************************************************************
 904 ****************************************************************/
 905
 906 static struct messaging_context *msg_context(TALLOC_CTX *mem_ctx)
 907 {
 908         static struct messaging_context *ctx;
 909
 910         if (!ctx && !(ctx = messaging_init(mem_ctx, server_id_self(),
 911                                            ev_context()))) {
 912                 smb_panic("Could not init messaging context");
 913         }
 914         return ctx;
 915 }
 916
 917 /****************************************************************
 918 ****************************************************************/
 919
 920 static NTSTATUS process_dc_netbios(TALLOC_CTX *mem_ctx,
 921                                    struct messaging_context *msg_ctx,
 922                                    const char *domain_name,
 923                                    uint32_t flags,
 924                                    struct ip_service_name *dclist,
 925                                    int num_dcs,
 926                                    struct netr_DsRGetDCNameInfo **info)
 927 {
 928         struct sockaddr_storage ss;
 929         struct ip_service ip_list;
 930         enum nbt_name_type name_type = NBT_NAME_LOGON;
 931         NTSTATUS status;
 932         int i;
 933         const char *dc_name = NULL;
 934         fstring tmp_dc_name;
 935         struct netlogon_samlogon_response *r = NULL;
 936         bool store_cache = false;
 937         uint32_t nt_version = NETLOGON_NT_VERSION_1 |
 938                               NETLOGON_NT_VERSION_5 |
 939                               NETLOGON_NT_VERSION_5EX_WITH_IP;
 940
 941         if (!msg_ctx) {
 942                 msg_ctx = msg_context(mem_ctx);
 943         }
 944
 945         if (flags & DS_PDC_REQUIRED) {
 946                 name_type = NBT_NAME_PDC;
 947         }
 948
 949         nt_version |= map_ds_flags_to_nt_version(flags);
 950
 951         DEBUG(10,("process_dc_netbios\n"));
 952
 953         for (i=0; i<num_dcs; i++) {
 954
 955                 ip_list.ss = dclist[i].ss;
 956                 ip_list.port = 0;
 957
 958                 if (!interpret_string_addr_prefer_ipv4(&ss, dclist[i].hostname, AI_NUMERICHOST)) {
 959                         return NT_STATUS_UNSUCCESSFUL;
 960                 }
 961
 962                 if (send_getdc_request(mem_ctx, msg_ctx,
 963                                        &dclist[i].ss, domain_name,
 964                                        NULL, nt_version))
 965                 {
 966                         int k;
 967                         smb_msleep(300);
 968                         for (k=0; k<5; k++) {
 969                                 if (receive_getdc_response(mem_ctx,
 970                                                            &dclist[i].ss,
 971                                                            domain_name,
 972                                                            &nt_version,
 973                                                            &dc_name,
 974                                                            &r)) {
 975                                         store_cache = true;
 976                                         namecache_store(dc_name, NBT_NAME_SERVER, 1, &ip_list);
 977                                         goto make_reply;
 978                                 }
 979                                 smb_msleep(1500);
 980                         }
 981                 }
 982
 983                 if (name_status_find(domain_name,
 984                                      name_type,
 985                                      NBT_NAME_SERVER,
 986                                      &dclist[i].ss,
 987                                      tmp_dc_name))
 988                 {
 989                         struct NETLOGON_SAM_LOGON_RESPONSE_NT40 logon1;
 990
 991                         r = TALLOC_ZERO_P(mem_ctx, struct netlogon_samlogon_response);
 992                         NT_STATUS_HAVE_NO_MEMORY(r);
 993
 994                         ZERO_STRUCT(logon1);
 995
 996                         nt_version = NETLOGON_NT_VERSION_1;
 997
 998                         logon1.nt_version = nt_version;
 999                         logon1.server = tmp_dc_name;
1000                         logon1.domain = talloc_strdup_upper(mem_ctx, domain_name);
1001                         NT_STATUS_HAVE_NO_MEMORY(logon1.domain);
1002
1003                         r->data.nt4 = logon1;
1004                         r->ntver = nt_version;
1005
1006                         map_netlogon_samlogon_response(r);
1007
1008                         namecache_store(tmp_dc_name, NBT_NAME_SERVER, 1, &ip_list);
1009
1010                         goto make_reply;
1011                 }
1012         }
1013
1014         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1015
1016  make_reply:
1017
1018         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1019                                                &r->data.nt5_ex, info);
1020         if (NT_STATUS_IS_OK(status) && store_cache) {
1021                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1022                                          nt_version, &r->data.nt5_ex);
1023         }
1024
1025         return status;
1026 }
1027
1028 /****************************************************************
1029 ****************************************************************/
1030
1031 static NTSTATUS dsgetdcname_rediscover(TALLOC_CTX *mem_ctx,
1032                                        struct messaging_context *msg_ctx,
1033                                        const char *domain_name,
1034                                        struct GUID *domain_guid,
1035                                        uint32_t flags,
1036                                        const char *site_name,
1037                                        struct netr_DsRGetDCNameInfo **info)
1038 {
1039         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1040         struct ip_service_name *dclist = NULL;
1041         int num_dcs;
1042
1043         DEBUG(10,("dsgetdcname_rediscover\n"));
1044
1045         if (flags & DS_IS_FLAT_NAME) {
1046
1047                 status = discover_dc_netbios(mem_ctx, domain_name, flags,
1048                                              &dclist, &num_dcs);
1049                 NT_STATUS_NOT_OK_RETURN(status);
1050
1051                 return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags,
1052                                           dclist, num_dcs, info);
1053         }
1054
1055         if (flags & DS_IS_DNS_NAME) {
1056
1057                 status = discover_dc_dns(mem_ctx, domain_name, domain_guid,
1058                                          flags, site_name, &dclist, &num_dcs);
1059                 NT_STATUS_NOT_OK_RETURN(status);
1060
1061                 return process_dc_dns(mem_ctx, domain_name, flags,
1062                                       dclist, num_dcs, info);
1063         }
1064
1065         status = discover_dc_dns(mem_ctx, domain_name, domain_guid, flags,
1066                                  site_name, &dclist, &num_dcs);
1067
1068         if (NT_STATUS_IS_OK(status) && num_dcs != 0) {
1069
1070                 status = process_dc_dns(mem_ctx, domain_name, flags, dclist,
1071                                         num_dcs, info);
1072                 if (NT_STATUS_IS_OK(status)) {
1073                         return status;
1074                 }
1075         }
1076
1077         status = discover_dc_netbios(mem_ctx, domain_name, flags, &dclist,
1078                                      &num_dcs);
1079         NT_STATUS_NOT_OK_RETURN(status);
1080
1081         return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags, dclist,
1082                                   num_dcs, info);
1083 }
1084
1085 static bool is_closest_site(struct netr_DsRGetDCNameInfo *info)
1086 {
1087         if (info->dc_flags & DS_SERVER_CLOSEST) {
1088                 return true;
1089         }
1090
1091         if (!info->client_site_name) {
1092                 return true;
1093         }
1094
1095         if (!info->dc_site_name) {
1096                 return false;
1097         }
1098
1099         if (strcmp(info->client_site_name, info->dc_site_name) == 0) {
1100                 return true;
1101         }
1102
1103         return false;
1104 }
1105
1106 /********************************************************************
1107  dsgetdcname.
1108
1109  This will be the only public function here.
1110 ********************************************************************/
1111
1112 NTSTATUS dsgetdcname(TALLOC_CTX *mem_ctx,
1113                      struct messaging_context *msg_ctx,
1114                      const char *domain_name,
1115                      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         char *query_site = NULL;
1123         bool first = true;
1124         struct netr_DsRGetDCNameInfo *first_info = NULL;
1125
1126         DEBUG(10,("dsgetdcname: domain_name: %s, "
1127                   "domain_guid: %s, site_name: %s, flags: 0x%08x\n",
1128                   domain_name,
1129                   domain_guid ? GUID_string(mem_ctx, domain_guid) : "(null)",
1130                   site_name, flags));
1131
1132         *info = NULL;
1133
1134         if (!check_allowed_required_flags(flags, site_name)) {
1135                 DEBUG(0,("invalid flags specified\n"));
1136                 return NT_STATUS_INVALID_PARAMETER;
1137         }
1138
1139         if (!site_name) {
1140                 query_site = sitename_fetch(domain_name);
1141         } else {
1142                 query_site = SMB_STRDUP(site_name);
1143         }
1144
1145         if (flags & DS_FORCE_REDISCOVERY) {
1146                 goto rediscover;
1147         }
1148
1149         status = dsgetdcname_cached(mem_ctx, msg_ctx, domain_name, domain_guid,
1150                                     flags, query_site, &myinfo);
1151         if (NT_STATUS_IS_OK(status)) {
1152                 goto done;
1153         }
1154
1155         if (flags & DS_BACKGROUND_ONLY) {
1156                 goto done;
1157         }
1158
1159  rediscover:
1160         status = dsgetdcname_rediscover(mem_ctx, msg_ctx, domain_name,
1161                                         domain_guid, flags, query_site,
1162                                         &myinfo);
1163
1164  done:
1165         SAFE_FREE(query_site);
1166
1167         if (!NT_STATUS_IS_OK(status)) {
1168                 if (!first) {
1169                         *info = first_info;
1170                         return NT_STATUS_OK;
1171                 }
1172                 return status;
1173         }
1174
1175         if (!first) {
1176                 TALLOC_FREE(first_info);
1177         } else if (!is_closest_site(myinfo)) {
1178                 first = false;
1179                 first_info = myinfo;
1180                 /* TODO: may use the next_closest_site here */
1181                 query_site = SMB_STRDUP(myinfo->client_site_name);
1182                 goto rediscover;
1183         }
1184
1185         *info = myinfo;
1186         return NT_STATUS_OK;
1187 }