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
  27 #define DSGETDCNAME_FMT "DSGETDCNAME/DOMAIN/%s"
  28 /* 15 minutes */
  29 #define DSGETDCNAME_CACHE_TTL   60*15
  30
  31 struct ip_service_name {
  32         struct sockaddr_storage ss;
  33         unsigned port;
  34         const char *hostname;
  35 };
  36
  37 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
  38                                               uint32_t flags,
  39                                               struct sockaddr_storage *ss,
  40                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
  41                                               struct netr_DsRGetDCNameInfo **info);
  42
  43 /****************************************************************
  44 ****************************************************************/
  45
  46 void debug_dsdcinfo_flags(int lvl, uint32_t flags)
  47 {
  48         DEBUG(lvl,("debug_dsdcinfo_flags: 0x%08x\n\t", flags));
  49
  50         if (flags & DS_FORCE_REDISCOVERY)
  51                 DEBUGADD(lvl,("DS_FORCE_REDISCOVERY "));
  52         if (flags & 0x000000002)
  53                 DEBUGADD(lvl,("0x00000002 "));
  54         if (flags & 0x000000004)
  55                 DEBUGADD(lvl,("0x00000004 "));
  56         if (flags & 0x000000008)
  57                 DEBUGADD(lvl,("0x00000008 "));
  58         if (flags & DS_DIRECTORY_SERVICE_REQUIRED)
  59                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_REQUIRED "));
  60         if (flags & DS_DIRECTORY_SERVICE_PREFERRED)
  61                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_PREFERRED "));
  62         if (flags & DS_GC_SERVER_REQUIRED)
  63                 DEBUGADD(lvl,("DS_GC_SERVER_REQUIRED "));
  64         if (flags & DS_PDC_REQUIRED)
  65                 DEBUGADD(lvl,("DS_PDC_REQUIRED "));
  66         if (flags & DS_BACKGROUND_ONLY)
  67                 DEBUGADD(lvl,("DS_BACKGROUND_ONLY "));
  68         if (flags & DS_IP_REQUIRED)
  69                 DEBUGADD(lvl,("DS_IP_REQUIRED "));
  70         if (flags & DS_KDC_REQUIRED)
  71                 DEBUGADD(lvl,("DS_KDC_REQUIRED "));
  72         if (flags & DS_TIMESERV_REQUIRED)
  73                 DEBUGADD(lvl,("DS_TIMESERV_REQUIRED "));
  74         if (flags & DS_WRITABLE_REQUIRED)
  75                 DEBUGADD(lvl,("DS_WRITABLE_REQUIRED "));
  76         if (flags & DS_GOOD_TIMESERV_PREFERRED)
  77                 DEBUGADD(lvl,("DS_GOOD_TIMESERV_PREFERRED "));
  78         if (flags & DS_AVOID_SELF)
  79                 DEBUGADD(lvl,("DS_AVOID_SELF "));
  80         if (flags & DS_ONLY_LDAP_NEEDED)
  81                 DEBUGADD(lvl,("DS_ONLY_LDAP_NEEDED "));
  82         if (flags & DS_IS_FLAT_NAME)
  83                 DEBUGADD(lvl,("DS_IS_FLAT_NAME "));
  84         if (flags & DS_IS_DNS_NAME)
  85                 DEBUGADD(lvl,("DS_IS_DNS_NAME "));
  86         if (flags & 0x00040000)
  87                 DEBUGADD(lvl,("0x00040000 "));
  88         if (flags & 0x00080000)
  89                 DEBUGADD(lvl,("0x00080000 "));
  90         if (flags & 0x00100000)
  91                 DEBUGADD(lvl,("0x00100000 "));
  92         if (flags & 0x00200000)
  93                 DEBUGADD(lvl,("0x00200000 "));
  94         if (flags & 0x00400000)
  95                 DEBUGADD(lvl,("0x00400000 "));
  96         if (flags & 0x00800000)
  97                 DEBUGADD(lvl,("0x00800000 "));
  98         if (flags & 0x01000000)
  99                 DEBUGADD(lvl,("0x01000000 "));
 100         if (flags & 0x02000000)
 101                 DEBUGADD(lvl,("0x02000000 "));
 102         if (flags & 0x04000000)
 103                 DEBUGADD(lvl,("0x04000000 "));
 104         if (flags & 0x08000000)
 105                 DEBUGADD(lvl,("0x08000000 "));
 106         if (flags & 0x10000000)
 107                 DEBUGADD(lvl,("0x10000000 "));
 108         if (flags & 0x20000000)
 109                 DEBUGADD(lvl,("0x20000000 "));
 110         if (flags & DS_RETURN_DNS_NAME)
 111                 DEBUGADD(lvl,("DS_RETURN_DNS_NAME "));
 112         if (flags & DS_RETURN_FLAT_NAME)
 113                 DEBUGADD(lvl,("DS_RETURN_FLAT_NAME "));
 114         if (flags)
 115                 DEBUGADD(lvl,("\n"));
 116 }
 117
 118 /****************************************************************
 119 ****************************************************************/
 120
 121 static char *dsgetdcname_cache_key(TALLOC_CTX *mem_ctx, const char *domain)
 122 {
 123         if (!domain) {
 124                 return NULL;
 125         }
 126
 127         return talloc_asprintf_strupper_m(mem_ctx, DSGETDCNAME_FMT, domain);
 128 }
 129
 130 /****************************************************************
 131 ****************************************************************/
 132
 133 static NTSTATUS dsgetdcname_cache_delete(TALLOC_CTX *mem_ctx,
 134                                         const char *domain_name)
 135 {
 136         char *key;
 137
 138         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 139         if (!key) {
 140                 return NT_STATUS_NO_MEMORY;
 141         }
 142
 143         if (!gencache_del(key)) {
 144                 return NT_STATUS_UNSUCCESSFUL;
 145         }
 146
 147         return NT_STATUS_OK;
 148 }
 149
 150 /****************************************************************
 151 ****************************************************************/
 152
 153 static NTSTATUS dsgetdcname_cache_store(TALLOC_CTX *mem_ctx,
 154                                         const char *domain_name,
 155                                         const DATA_BLOB *blob)
 156 {
 157         time_t expire_time;
 158         char *key;
 159         bool ret = false;
 160
 161         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 162         if (!key) {
 163                 return NT_STATUS_NO_MEMORY;
 164         }
 165
 166         expire_time = time(NULL) + DSGETDCNAME_CACHE_TTL;
 167
 168         ret = gencache_set_data_blob(key, blob, expire_time);
 169
 170         return ret ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
 171 }
 172
 173 /****************************************************************
 174 ****************************************************************/
 175
 176 static NTSTATUS store_cldap_reply(TALLOC_CTX *mem_ctx,
 177                                   uint32_t flags,
 178                                   struct sockaddr_storage *ss,
 179                                   uint32_t nt_version,
 180                                   struct NETLOGON_SAM_LOGON_RESPONSE_EX *r)
 181 {
 182         DATA_BLOB blob;
 183         enum ndr_err_code ndr_err;
 184         NTSTATUS status;
 185         char addr[INET6_ADDRSTRLEN];
 186
 187        print_sockaddr(addr, sizeof(addr), ss);
 188
 189         /* FIXME */
 190         r->sockaddr_size = 0x10; /* the w32 winsock addr size */
 191         r->sockaddr.sockaddr_family = 2; /* AF_INET */
 192         r->sockaddr.pdc_ip = talloc_strdup(mem_ctx, addr);
 193
 194         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, r,
 195                        (ndr_push_flags_fn_t)ndr_push_NETLOGON_SAM_LOGON_RESPONSE_EX);
 196         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 197                 return ndr_map_error2ntstatus(ndr_err);
 198         }
 199
 200         if (r->domain_name) {
 201                 status = dsgetdcname_cache_store(mem_ctx, r->domain_name, &blob);
 202                 if (!NT_STATUS_IS_OK(status)) {
 203                         goto done;
 204                 }
 205                 if (r->client_site) {
 206                         sitename_store(r->domain_name, r->client_site);
 207                 }
 208         }
 209         if (r->dns_domain) {
 210                 status = dsgetdcname_cache_store(mem_ctx, r->dns_domain, &blob);
 211                 if (!NT_STATUS_IS_OK(status)) {
 212                         goto done;
 213                 }
 214                 if (r->client_site) {
 215                         sitename_store(r->dns_domain, r->client_site);
 216                 }
 217         }
 218
 219         status = NT_STATUS_OK;
 220
 221  done:
 222         data_blob_free(&blob);
 223
 224         return status;
 225 }
 226
 227 /****************************************************************
 228 ****************************************************************/
 229
 230 static uint32_t get_cldap_reply_server_flags(struct netlogon_samlogon_response *r,
 231                                              uint32_t nt_version)
 232 {
 233         switch (nt_version & 0x0000001f) {
 234                 case 0:
 235                 case 1:
 236                 case 16:
 237                 case 17:
 238                         return 0;
 239                 case 2:
 240                 case 3:
 241                 case 18:
 242                 case 19:
 243                         return r->data.nt5.server_type;
 244                 case 4:
 245                 case 5:
 246                 case 6:
 247                 case 7:
 248                         return r->data.nt5_ex.server_type;
 249                 case 8:
 250                 case 9:
 251                 case 10:
 252                 case 11:
 253                 case 12:
 254                 case 13:
 255                 case 14:
 256                 case 15:
 257                         return r->data.nt5_ex.server_type;
 258                 case 20:
 259                 case 21:
 260                 case 22:
 261                 case 23:
 262                 case 24:
 263                 case 25:
 264                 case 26:
 265                 case 27:
 266                 case 28:
 267                         return r->data.nt5_ex.server_type;
 268                 case 29:
 269                 case 30:
 270                 case 31:
 271                         return r->data.nt5_ex.server_type;
 272                 default:
 273                         return 0;
 274         }
 275 }
 276
 277 /****************************************************************
 278 ****************************************************************/
 279
 280 #define RETURN_ON_FALSE(x) if (!(x)) return false;
 281
 282 static bool check_cldap_reply_required_flags(uint32_t ret_flags,
 283                                              uint32_t req_flags)
 284 {
 285         if (ret_flags == 0) {
 286                 return true;
 287         }
 288
 289         if (req_flags & DS_PDC_REQUIRED)
 290                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_PDC);
 291
 292         if (req_flags & DS_GC_SERVER_REQUIRED)
 293                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_GC);
 294
 295         if (req_flags & DS_ONLY_LDAP_NEEDED)
 296                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_LDAP);
 297
 298         if ((req_flags & DS_DIRECTORY_SERVICE_REQUIRED) ||
 299             (req_flags & DS_DIRECTORY_SERVICE_PREFERRED))
 300                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_DS);
 301
 302         if (req_flags & DS_KDC_REQUIRED)
 303                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_KDC);
 304
 305         if (req_flags & DS_TIMESERV_REQUIRED)
 306                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_TIMESERV);
 307
 308         if (req_flags & DS_WRITABLE_REQUIRED)
 309                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_WRITABLE);
 310
 311         return true;
 312 }
 313
 314 /****************************************************************
 315 ****************************************************************/
 316
 317 static NTSTATUS dsgetdcname_cache_fetch(TALLOC_CTX *mem_ctx,
 318                                         const char *domain_name,
 319                                         const struct GUID *domain_guid,
 320                                         uint32_t flags,
 321                                         const char *site_name,
 322                                         struct netr_DsRGetDCNameInfo **info_p)
 323 {
 324         char *key;
 325         DATA_BLOB blob;
 326         enum ndr_err_code ndr_err;
 327         struct netr_DsRGetDCNameInfo *info;
 328         struct NETLOGON_SAM_LOGON_RESPONSE_EX r;
 329         NTSTATUS status;
 330
 331         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 332         if (!key) {
 333                 return NT_STATUS_NO_MEMORY;
 334         }
 335
 336         if (!gencache_get_data_blob(key, &blob, NULL, NULL)) {
 337                 return NT_STATUS_NOT_FOUND;
 338         }
 339
 340         info = TALLOC_ZERO_P(mem_ctx, struct netr_DsRGetDCNameInfo);
 341         if (!info) {
 342                 return NT_STATUS_NO_MEMORY;
 343         }
 344
 345         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &r,
 346                       (ndr_pull_flags_fn_t)ndr_pull_NETLOGON_SAM_LOGON_RESPONSE_EX);
 347
 348         data_blob_free(&blob);
 349         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 350                 dsgetdcname_cache_delete(mem_ctx, domain_name);
 351                 return ndr_map_error2ntstatus(ndr_err);
 352         }
 353
 354         status = make_dc_info_from_cldap_reply(mem_ctx, flags, NULL,
 355                                                &r, &info);
 356         if (!NT_STATUS_IS_OK(status)) {
 357                 return status;
 358         }
 359
 360         if (DEBUGLEVEL >= 10) {
 361                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, info);
 362         }
 363
 364         /* check flags */
 365         if (!check_cldap_reply_required_flags(info->dc_flags, flags)) {
 366                 DEBUG(10,("invalid flags\n"));
 367                 return NT_STATUS_INVALID_PARAMETER;
 368         }
 369
 370         if ((flags & DS_IP_REQUIRED) &&
 371             (info->dc_address_type != DS_ADDRESS_TYPE_INET)) {
 372                 return NT_STATUS_INVALID_PARAMETER_MIX;
 373         }
 374
 375         *info_p = info;
 376
 377         return NT_STATUS_OK;
 378 }
 379
 380 /****************************************************************
 381 ****************************************************************/
 382
 383 static NTSTATUS dsgetdcname_cached(TALLOC_CTX *mem_ctx,
 384                                    struct messaging_context *msg_ctx,
 385                                    const char *domain_name,
 386                                    const struct GUID *domain_guid,
 387                                    uint32_t flags,
 388                                    const char *site_name,
 389                                    struct netr_DsRGetDCNameInfo **info)
 390 {
 391         NTSTATUS status;
 392
 393         status = dsgetdcname_cache_fetch(mem_ctx, domain_name, domain_guid,
 394                                          flags, site_name, info);
 395         if (!NT_STATUS_IS_OK(status)
 396             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 397                 DEBUG(10,("dsgetdcname_cached: cache fetch failed with: %s\n",
 398                         nt_errstr(status)));
 399                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 400         }
 401
 402         if (flags & DS_BACKGROUND_ONLY) {
 403                 return status;
 404         }
 405
 406         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 407                 struct netr_DsRGetDCNameInfo *dc_info;
 408
 409                 status = dsgetdcname(mem_ctx, msg_ctx, domain_name,
 410                                      domain_guid, site_name,
 411                                      flags | DS_FORCE_REDISCOVERY,
 412                                      &dc_info);
 413
 414                 if (!NT_STATUS_IS_OK(status)) {
 415                         return status;
 416                 }
 417
 418                 *info = dc_info;
 419         }
 420
 421         return status;
 422 }
 423
 424 /****************************************************************
 425 ****************************************************************/
 426
 427 static bool check_allowed_required_flags(uint32_t flags,
 428                                          const char *site_name)
 429 {
 430         uint32_t return_type = flags & (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME);
 431         uint32_t offered_type = flags & (DS_IS_FLAT_NAME|DS_IS_DNS_NAME);
 432         uint32_t query_type = flags & (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY);
 433
 434         /* FIXME: check for DSGETDC_VALID_FLAGS and check for excluse bits
 435          * (DS_PDC_REQUIRED, DS_KDC_REQUIRED, DS_GC_SERVER_REQUIRED) */
 436
 437         debug_dsdcinfo_flags(10, flags);
 438
 439         if ((flags & DS_TRY_NEXTCLOSEST_SITE) && site_name) {
 440                 return false;
 441         }
 442
 443         if (return_type == (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME)) {
 444                 return false;
 445         }
 446
 447         if (offered_type == (DS_IS_DNS_NAME|DS_IS_FLAT_NAME)) {
 448                 return false;
 449         }
 450
 451         if (query_type == (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY)) {
 452                 return false;
 453         }
 454
 455 #if 0
 456         if ((flags & DS_RETURN_DNS_NAME) && (!(flags & DS_IP_REQUIRED))) {
 457                 printf("gd: here5 \n");
 458                 return false;
 459         }
 460 #endif
 461         return true;
 462 }
 463
 464 /****************************************************************
 465 ****************************************************************/
 466
 467 static NTSTATUS discover_dc_netbios(TALLOC_CTX *mem_ctx,
 468                                     const char *domain_name,
 469                                     uint32_t flags,
 470                                     struct ip_service_name **returned_dclist,
 471                                     int *returned_count)
 472 {
 473         NTSTATUS status;
 474         enum nbt_name_type name_type = NBT_NAME_LOGON;
 475         struct ip_service *iplist;
 476         int i;
 477         struct ip_service_name *dclist = NULL;
 478         int count;
 479
 480         *returned_dclist = NULL;
 481         *returned_count = 0;
 482
 483         if (lp_disable_netbios()) {
 484                 return NT_STATUS_NOT_SUPPORTED;
 485         }
 486
 487         if (flags & DS_PDC_REQUIRED) {
 488                 name_type = NBT_NAME_PDC;
 489         }
 490
 491         status = internal_resolve_name(domain_name, name_type, NULL,
 492                                        &iplist, &count,
 493                                        "lmhosts wins bcast");
 494         if (!NT_STATUS_IS_OK(status)) {
 495                 DEBUG(10,("discover_dc_netbios: failed to find DC\n"));
 496                 return status;
 497         }
 498
 499         dclist = TALLOC_ZERO_ARRAY(mem_ctx, struct ip_service_name, count);
 500         if (!dclist) {
 501                 SAFE_FREE(iplist);
 502                 return NT_STATUS_NO_MEMORY;
 503         }
 504
 505         for (i=0; i<count; i++) {
 506
 507                 char addr[INET6_ADDRSTRLEN];
 508                 struct ip_service_name *r = &dclist[i];
 509
 510                 print_sockaddr(addr, sizeof(addr),
 511                                &iplist[i].ss);
 512
 513                 r->ss   = iplist[i].ss;
 514                 r->port = iplist[i].port;
 515                 r->hostname = talloc_strdup(mem_ctx, addr);
 516                 if (!r->hostname) {
 517                         SAFE_FREE(iplist);
 518                         return NT_STATUS_NO_MEMORY;
 519                 }
 520
 521         }
 522
 523         *returned_dclist = dclist;
 524         *returned_count = count;
 525         SAFE_FREE(iplist);
 526
 527         return NT_STATUS_OK;
 528 }
 529
 530 /****************************************************************
 531 ****************************************************************/
 532
 533 static NTSTATUS discover_dc_dns(TALLOC_CTX *mem_ctx,
 534                                 const char *domain_name,
 535                                 const struct GUID *domain_guid,
 536                                 uint32_t flags,
 537                                 const char *site_name,
 538                                 struct ip_service_name **returned_dclist,
 539                                 int *return_count)
 540 {
 541         int i, j;
 542         NTSTATUS status;
 543         struct dns_rr_srv *dcs = NULL;
 544         int numdcs = 0;
 545         int numaddrs = 0;
 546         struct ip_service_name *dclist = NULL;
 547         int count = 0;
 548
 549         if (flags & DS_PDC_REQUIRED) {
 550                 status = ads_dns_query_pdc(mem_ctx, domain_name,
 551                                            &dcs, &numdcs);
 552         } else if (flags & DS_GC_SERVER_REQUIRED) {
 553                 status = ads_dns_query_gcs(mem_ctx, domain_name, site_name,
 554                                            &dcs, &numdcs);
 555         } else if (flags & DS_KDC_REQUIRED) {
 556                 status = ads_dns_query_kdcs(mem_ctx, domain_name, site_name,
 557                                             &dcs, &numdcs);
 558         } else if (flags & DS_DIRECTORY_SERVICE_REQUIRED) {
 559                 status = ads_dns_query_dcs(mem_ctx, domain_name, site_name,
 560                                            &dcs, &numdcs);
 561         } else if (domain_guid) {
 562                 status = ads_dns_query_dcs_guid(mem_ctx, domain_name,
 563                                                 domain_guid, &dcs, &numdcs);
 564         } else {
 565                 status = ads_dns_query_dcs(mem_ctx, domain_name, site_name,
 566                                            &dcs, &numdcs);
 567         }
 568
 569         if (!NT_STATUS_IS_OK(status)) {
 570                 return status;
 571         }
 572
 573         if (numdcs == 0) {
 574                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 575         }
 576
 577         for (i=0;i<numdcs;i++) {
 578                 numaddrs += MAX(dcs[i].num_ips,1);
 579         }
 580
 581         dclist = TALLOC_ZERO_ARRAY(mem_ctx,
 582                                    struct ip_service_name,
 583                                    numaddrs);
 584         if (!dclist) {
 585                 return NT_STATUS_NO_MEMORY;
 586         }
 587
 588         /* now unroll the list of IP addresses */
 589
 590         *return_count = 0;
 591         i = 0;
 592         j = 0;
 593
 594         while ((i < numdcs) && (count < numaddrs)) {
 595
 596                 struct ip_service_name *r = &dclist[count];
 597
 598                 r->port = dcs[i].port;
 599                 r->hostname = dcs[i].hostname;
 600
 601                 /* If we don't have an IP list for a name, lookup it up */
 602
 603                 if (!dcs[i].ss_s) {
 604                         interpret_string_addr_prefer_ipv4(&r->ss,
 605                                                 dcs[i].hostname, 0);
 606                         i++;
 607                         j = 0;
 608                 } else {
 609                         /* use the IP addresses from the SRV sresponse */
 610
 611                         if (j >= dcs[i].num_ips) {
 612                                 i++;
 613                                 j = 0;
 614                                 continue;
 615                         }
 616
 617                         r->ss = dcs[i].ss_s[j];
 618                         j++;
 619                 }
 620
 621                 /* make sure it is a valid IP.  I considered checking the
 622                  * negative connection cache, but this is the wrong place for
 623                  * it.  Maybe only as a hac.  After think about it, if all of
 624                  * the IP addresses retuend from DNS are dead, what hope does a
 625                  * netbios name lookup have?  The standard reason for falling
 626                  * back to netbios lookups is that our DNS server doesn't know
 627                  * anything about the DC's   -- jerry */
 628
 629                 if (!is_zero_addr((struct sockaddr *)(void *)&r->ss)) {
 630                         count++;
 631                         continue;
 632                 }
 633         }
 634
 635         *returned_dclist = dclist;
 636         *return_count = count;
 637
 638         if (count > 0) {
 639                 return NT_STATUS_OK;
 640         }
 641
 642         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 643 }
 644
 645 /****************************************************************
 646 ****************************************************************/
 647
 648 static NTSTATUS make_domain_controller_info(TALLOC_CTX *mem_ctx,
 649                                             const char *dc_unc,
 650                                             const char *dc_address,
 651                                             uint32_t dc_address_type,
 652                                             const struct GUID *domain_guid,
 653                                             const char *domain_name,
 654                                             const char *forest_name,
 655                                             uint32_t flags,
 656                                             const char *dc_site_name,
 657                                             const char *client_site_name,
 658                                             struct netr_DsRGetDCNameInfo **info_out)
 659 {
 660         struct netr_DsRGetDCNameInfo *info;
 661
 662         info = TALLOC_ZERO_P(mem_ctx, struct netr_DsRGetDCNameInfo);
 663         NT_STATUS_HAVE_NO_MEMORY(info);
 664
 665         if (dc_unc) {
 666                 info->dc_unc = talloc_strdup(mem_ctx, dc_unc);
 667                 NT_STATUS_HAVE_NO_MEMORY(info->dc_unc);
 668         }
 669
 670         if (dc_address) {
 671                 if (!(dc_address[0] == '\\' && dc_address[1] == '\\')) {
 672                         info->dc_address = talloc_asprintf(mem_ctx, "\\\\%s",
 673                                                            dc_address);
 674                 } else {
 675                         info->dc_address = talloc_strdup(mem_ctx, dc_address);
 676                 }
 677                 NT_STATUS_HAVE_NO_MEMORY(info->dc_address);
 678         }
 679
 680         info->dc_address_type = dc_address_type;
 681
 682         if (domain_guid) {
 683                 info->domain_guid = *domain_guid;
 684         }
 685
 686         if (domain_name) {
 687                 info->domain_name = talloc_strdup(mem_ctx, domain_name);
 688                 NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
 689         }
 690
 691         if (forest_name && *forest_name) {
 692                 info->forest_name = talloc_strdup(mem_ctx, forest_name);
 693                 NT_STATUS_HAVE_NO_MEMORY(info->forest_name);
 694                 flags |= DS_DNS_FOREST_ROOT;
 695         }
 696
 697         info->dc_flags = flags;
 698
 699         if (dc_site_name) {
 700                 info->dc_site_name = talloc_strdup(mem_ctx, dc_site_name);
 701                 NT_STATUS_HAVE_NO_MEMORY(info->dc_site_name);
 702         }
 703
 704         if (client_site_name) {
 705                 info->client_site_name = talloc_strdup(mem_ctx,
 706                                                        client_site_name);
 707                 NT_STATUS_HAVE_NO_MEMORY(info->client_site_name);
 708         }
 709
 710         *info_out = info;
 711
 712         return NT_STATUS_OK;
 713 }
 714
 715 /****************************************************************
 716 ****************************************************************/
 717
 718 static void map_dc_and_domain_names(uint32_t flags,
 719                                     const char *dc_name,
 720                                     const char *domain_name,
 721                                     const char *dns_dc_name,
 722                                     const char *dns_domain_name,
 723                                     uint32_t *dc_flags,
 724                                     const char **hostname_p,
 725                                     const char **domain_p)
 726 {
 727         switch (flags & 0xf0000000) {
 728                 case DS_RETURN_FLAT_NAME:
 729                         if (dc_name && domain_name &&
 730                             *dc_name && *domain_name) {
 731                                 *hostname_p = dc_name;
 732                                 *domain_p = domain_name;
 733                                 break;
 734                         }
 735                 case DS_RETURN_DNS_NAME:
 736                 default:
 737                         if (dns_dc_name && dns_domain_name &&
 738                             *dns_dc_name && *dns_domain_name) {
 739                                 *hostname_p = dns_dc_name;
 740                                 *domain_p = dns_domain_name;
 741                                 *dc_flags |= DS_DNS_DOMAIN | DS_DNS_CONTROLLER;
 742                                 break;
 743                         }
 744                         if (dc_name && domain_name &&
 745                             *dc_name && *domain_name) {
 746                                 *hostname_p = dc_name;
 747                                 *domain_p = domain_name;
 748                                 break;
 749                         }
 750         }
 751 }
 752
 753 /****************************************************************
 754 ****************************************************************/
 755
 756 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
 757                                               uint32_t flags,
 758                                               struct sockaddr_storage *ss,
 759                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
 760                                               struct netr_DsRGetDCNameInfo **info)
 761 {
 762         const char *dc_hostname = NULL;
 763         const char *dc_domain_name = NULL;
 764         const char *dc_address = NULL;
 765         const char *dc_forest = NULL;
 766         uint32_t dc_address_type = 0;
 767         uint32_t dc_flags = 0;
 768         struct GUID *dc_domain_guid = NULL;
 769         const char *dc_server_site = NULL;
 770         const char *dc_client_site = NULL;
 771
 772         char addr[INET6_ADDRSTRLEN];
 773
 774         if (ss) {
 775                 print_sockaddr(addr, sizeof(addr), ss);
 776                 dc_address = addr;
 777                 dc_address_type = DS_ADDRESS_TYPE_INET;
 778         }
 779
 780         if (!ss && r->sockaddr.pdc_ip) {
 781                 dc_address      = r->sockaddr.pdc_ip;
 782                 dc_address_type = DS_ADDRESS_TYPE_INET;
 783         } else {
 784                 dc_address      = r->pdc_name;
 785                 dc_address_type = DS_ADDRESS_TYPE_NETBIOS;
 786         }
 787
 788         map_dc_and_domain_names(flags,
 789                                 r->pdc_name,
 790                                 r->domain_name,
 791                                 r->pdc_dns_name,
 792                                 r->dns_domain,
 793                                 &dc_flags,
 794                                 &dc_hostname,
 795                                 &dc_domain_name);
 796
 797         dc_flags        |= r->server_type;
 798         dc_forest       = r->forest;
 799         dc_domain_guid  = &r->domain_uuid;
 800         dc_server_site  = r->server_site;
 801         dc_client_site  = r->client_site;
 802
 803         return make_domain_controller_info(mem_ctx,
 804                                            dc_hostname,
 805                                            dc_address,
 806                                            dc_address_type,
 807                                            dc_domain_guid,
 808                                            dc_domain_name,
 809                                            dc_forest,
 810                                            dc_flags,
 811                                            dc_server_site,
 812                                            dc_client_site,
 813                                            info);
 814 }
 815
 816 /****************************************************************
 817 ****************************************************************/
 818
 819 static uint32_t map_ds_flags_to_nt_version(uint32_t flags)
 820 {
 821         uint32_t nt_version = 0;
 822
 823         if (flags & DS_PDC_REQUIRED) {
 824                 nt_version |= NETLOGON_NT_VERSION_PDC;
 825         }
 826
 827         if (flags & DS_GC_SERVER_REQUIRED) {
 828                 nt_version |= NETLOGON_NT_VERSION_GC;
 829         }
 830
 831         if (flags & DS_TRY_NEXTCLOSEST_SITE) {
 832                 nt_version |= NETLOGON_NT_VERSION_WITH_CLOSEST_SITE;
 833         }
 834
 835         if (flags & DS_IP_REQUIRED) {
 836                 nt_version |= NETLOGON_NT_VERSION_IP;
 837         }
 838
 839         return nt_version;
 840 }
 841
 842 /****************************************************************
 843 ****************************************************************/
 844
 845 static NTSTATUS process_dc_dns(TALLOC_CTX *mem_ctx,
 846                                const char *domain_name,
 847                                uint32_t flags,
 848                                struct ip_service_name *dclist,
 849                                int num_dcs,
 850                                struct netr_DsRGetDCNameInfo **info)
 851 {
 852         int i = 0;
 853         bool valid_dc = false;
 854         struct netlogon_samlogon_response *r = NULL;
 855         uint32_t nt_version = NETLOGON_NT_VERSION_5 |
 856                               NETLOGON_NT_VERSION_5EX;
 857         uint32_t ret_flags = 0;
 858         NTSTATUS status;
 859
 860         nt_version |= map_ds_flags_to_nt_version(flags);
 861
 862         for (i=0; i<num_dcs; i++) {
 863
 864                 DEBUG(10,("LDAP ping to %s\n", dclist[i].hostname));
 865
 866                 if (ads_cldap_netlogon(mem_ctx, dclist[i].hostname,
 867                                         domain_name,
 868                                         nt_version,
 869                                         &r))
 870                 {
 871                         nt_version = r->ntver;
 872                         ret_flags = get_cldap_reply_server_flags(r, nt_version);
 873
 874                         if (check_cldap_reply_required_flags(ret_flags, flags)) {
 875                                 valid_dc = true;
 876                                 break;
 877                         }
 878                 }
 879
 880                 continue;
 881         }
 882
 883         if (!valid_dc) {
 884                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 885         }
 886
 887         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 888                                                &r->data.nt5_ex, info);
 889         if (NT_STATUS_IS_OK(status)) {
 890                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 891                                          nt_version, &r->data.nt5_ex);
 892         }
 893
 894         return status;
 895 }
 896
 897 /****************************************************************
 898 ****************************************************************/
 899
 900 static struct event_context *ev_context(void)
 901 {
 902         static struct event_context *ctx;
 903
 904         if (!ctx && !(ctx = event_context_init(NULL))) {
 905                 smb_panic("Could not init event context");
 906         }
 907         return ctx;
 908 }
 909
 910 /****************************************************************
 911 ****************************************************************/
 912
 913 static struct messaging_context *msg_context(TALLOC_CTX *mem_ctx)
 914 {
 915         static struct messaging_context *ctx;
 916
 917         if (!ctx && !(ctx = messaging_init(mem_ctx, procid_self(),
 918                                            ev_context()))) {
 919                 smb_panic("Could not init messaging context");
 920         }
 921         return ctx;
 922 }
 923
 924 /****************************************************************
 925 ****************************************************************/
 926
 927 static NTSTATUS process_dc_netbios(TALLOC_CTX *mem_ctx,
 928                                    struct messaging_context *msg_ctx,
 929                                    const char *domain_name,
 930                                    uint32_t flags,
 931                                    struct ip_service_name *dclist,
 932                                    int num_dcs,
 933                                    struct netr_DsRGetDCNameInfo **info)
 934 {
 935         struct sockaddr_storage ss;
 936         struct ip_service ip_list;
 937         enum nbt_name_type name_type = NBT_NAME_LOGON;
 938         NTSTATUS status;
 939         int i;
 940         const char *dc_name = NULL;
 941         fstring tmp_dc_name;
 942         struct netlogon_samlogon_response *r = NULL;
 943         bool store_cache = false;
 944         uint32_t nt_version = NETLOGON_NT_VERSION_1 |
 945                               NETLOGON_NT_VERSION_5 |
 946                               NETLOGON_NT_VERSION_5EX_WITH_IP;
 947
 948         if (!msg_ctx) {
 949                 msg_ctx = msg_context(mem_ctx);
 950         }
 951
 952         if (flags & DS_PDC_REQUIRED) {
 953                 name_type = NBT_NAME_PDC;
 954         }
 955
 956         nt_version |= map_ds_flags_to_nt_version(flags);
 957
 958         DEBUG(10,("process_dc_netbios\n"));
 959
 960         for (i=0; i<num_dcs; i++) {
 961
 962                 ip_list.ss = dclist[i].ss;
 963                 ip_list.port = 0;
 964
 965                 if (!interpret_string_addr_prefer_ipv4(&ss, dclist[i].hostname, AI_NUMERICHOST)) {
 966                         return NT_STATUS_UNSUCCESSFUL;
 967                 }
 968
 969                 if (send_getdc_request(mem_ctx, msg_ctx,
 970                                        &dclist[i].ss, domain_name,
 971                                        NULL, nt_version))
 972                 {
 973                         int k;
 974                         smb_msleep(300);
 975                         for (k=0; k<5; k++) {
 976                                 if (receive_getdc_response(mem_ctx,
 977                                                            &dclist[i].ss,
 978                                                            domain_name,
 979                                                            &nt_version,
 980                                                            &dc_name,
 981                                                            &r)) {
 982                                         store_cache = true;
 983                                         namecache_store(dc_name, NBT_NAME_SERVER, 1, &ip_list);
 984                                         goto make_reply;
 985                                 }
 986                                 smb_msleep(1500);
 987                         }
 988                 }
 989
 990                 if (name_status_find(domain_name,
 991                                      name_type,
 992                                      NBT_NAME_SERVER,
 993                                      &dclist[i].ss,
 994                                      tmp_dc_name))
 995                 {
 996                         struct NETLOGON_SAM_LOGON_RESPONSE_NT40 logon1;
 997
 998                         r = TALLOC_ZERO_P(mem_ctx, struct netlogon_samlogon_response);
 999                         NT_STATUS_HAVE_NO_MEMORY(r);
1000
1001                         ZERO_STRUCT(logon1);
1002
1003                         nt_version = NETLOGON_NT_VERSION_1;
1004
1005                         logon1.nt_version = nt_version;
1006                         logon1.pdc_name = tmp_dc_name;
1007                         logon1.domain_name = talloc_strdup_upper(mem_ctx, domain_name);
1008                         NT_STATUS_HAVE_NO_MEMORY(logon1.domain_name);
1009
1010                         r->data.nt4 = logon1;
1011                         r->ntver = nt_version;
1012
1013                         map_netlogon_samlogon_response(r);
1014
1015                         namecache_store(tmp_dc_name, NBT_NAME_SERVER, 1, &ip_list);
1016
1017                         goto make_reply;
1018                 }
1019         }
1020
1021         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1022
1023  make_reply:
1024
1025         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1026                                                &r->data.nt5_ex, info);
1027         if (NT_STATUS_IS_OK(status) && store_cache) {
1028                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
1029                                          nt_version, &r->data.nt5_ex);
1030         }
1031
1032         return status;
1033 }
1034
1035 /****************************************************************
1036 ****************************************************************/
1037
1038 static NTSTATUS dsgetdcname_rediscover(TALLOC_CTX *mem_ctx,
1039                                        struct messaging_context *msg_ctx,
1040                                        const char *domain_name,
1041                                        const struct GUID *domain_guid,
1042                                        uint32_t flags,
1043                                        const char *site_name,
1044                                        struct netr_DsRGetDCNameInfo **info)
1045 {
1046         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1047         struct ip_service_name *dclist = NULL;
1048         int num_dcs;
1049
1050         DEBUG(10,("dsgetdcname_rediscover\n"));
1051
1052         if (flags & DS_IS_FLAT_NAME) {
1053
1054                 status = discover_dc_netbios(mem_ctx, domain_name, flags,
1055                                              &dclist, &num_dcs);
1056                 NT_STATUS_NOT_OK_RETURN(status);
1057
1058                 return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags,
1059                                           dclist, num_dcs, info);
1060         }
1061
1062         if (flags & DS_IS_DNS_NAME) {
1063
1064                 status = discover_dc_dns(mem_ctx, domain_name, domain_guid,
1065                                          flags, site_name, &dclist, &num_dcs);
1066                 NT_STATUS_NOT_OK_RETURN(status);
1067
1068                 return process_dc_dns(mem_ctx, domain_name, flags,
1069                                       dclist, num_dcs, info);
1070         }
1071
1072         status = discover_dc_dns(mem_ctx, domain_name, domain_guid, flags,
1073                                  site_name, &dclist, &num_dcs);
1074
1075         if (NT_STATUS_IS_OK(status) && num_dcs != 0) {
1076
1077                 status = process_dc_dns(mem_ctx, domain_name, flags, dclist,
1078                                         num_dcs, info);
1079                 if (NT_STATUS_IS_OK(status)) {
1080                         return status;
1081                 }
1082         }
1083
1084         status = discover_dc_netbios(mem_ctx, domain_name, flags, &dclist,
1085                                      &num_dcs);
1086         NT_STATUS_NOT_OK_RETURN(status);
1087
1088         return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags, dclist,
1089                                   num_dcs, info);
1090 }
1091
1092 static bool is_closest_site(struct netr_DsRGetDCNameInfo *info)
1093 {
1094         if (info->dc_flags & DS_SERVER_CLOSEST) {
1095                 return true;
1096         }
1097
1098         if (!info->client_site_name) {
1099                 return true;
1100         }
1101
1102         if (!info->dc_site_name) {
1103                 return false;
1104         }
1105
1106         if (strcmp(info->client_site_name, info->dc_site_name) == 0) {
1107                 return true;
1108         }
1109
1110         return false;
1111 }
1112
1113 /********************************************************************
1114  dsgetdcname.
1115
1116  This will be the only public function here.
1117 ********************************************************************/
1118
1119 NTSTATUS dsgetdcname(TALLOC_CTX *mem_ctx,
1120                      struct messaging_context *msg_ctx,
1121                      const char *domain_name,
1122                      const struct GUID *domain_guid,
1123                      const char *site_name,
1124                      uint32_t flags,
1125                      struct netr_DsRGetDCNameInfo **info)
1126 {
1127         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1128         struct netr_DsRGetDCNameInfo *myinfo = NULL;
1129         char *query_site = NULL;
1130         bool first = true;
1131         struct netr_DsRGetDCNameInfo *first_info = NULL;
1132
1133         DEBUG(10,("dsgetdcname: domain_name: %s, "
1134                   "domain_guid: %s, site_name: %s, flags: 0x%08x\n",
1135                   domain_name,
1136                   domain_guid ? GUID_string(mem_ctx, domain_guid) : "(null)",
1137                   site_name, flags));
1138
1139         *info = NULL;
1140
1141         if (!check_allowed_required_flags(flags, site_name)) {
1142                 DEBUG(0,("invalid flags specified\n"));
1143                 return NT_STATUS_INVALID_PARAMETER;
1144         }
1145
1146         if ((site_name == NULL) || (site_name[0] == '\0')) {
1147                 query_site = sitename_fetch(domain_name);
1148         } else {
1149                 query_site = SMB_STRDUP(site_name);
1150         }
1151
1152         if (flags & DS_FORCE_REDISCOVERY) {
1153                 goto rediscover;
1154         }
1155
1156         status = dsgetdcname_cached(mem_ctx, msg_ctx, domain_name, domain_guid,
1157                                     flags, query_site, &myinfo);
1158         if (NT_STATUS_IS_OK(status)) {
1159                 goto done;
1160         }
1161
1162         if (flags & DS_BACKGROUND_ONLY) {
1163                 goto done;
1164         }
1165
1166  rediscover:
1167         status = dsgetdcname_rediscover(mem_ctx, msg_ctx, domain_name,
1168                                         domain_guid, flags, query_site,
1169                                         &myinfo);
1170
1171  done:
1172         SAFE_FREE(query_site);
1173
1174         if (!NT_STATUS_IS_OK(status)) {
1175                 if (!first) {
1176                         *info = first_info;
1177                         return NT_STATUS_OK;
1178                 }
1179                 return status;
1180         }
1181
1182         if (!first) {
1183                 TALLOC_FREE(first_info);
1184         } else if (!is_closest_site(myinfo)) {
1185                 first = false;
1186                 first_info = myinfo;
1187                 /* TODO: may use the next_closest_site here */
1188                 query_site = SMB_STRDUP(myinfo->client_site_name);
1189                 goto rediscover;
1190         }
1191
1192         *info = myinfo;
1193         return NT_STATUS_OK;
1194 }