source3/smbd/smbXsrv_tcon.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Stefan Metzmacher 2011-2012
   5    Copyright (C) Michael Adam 2012
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "system/filesys.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "dbwrap/dbwrap.h"
  26 #include "dbwrap/dbwrap_rbt.h"
  27 #include "dbwrap/dbwrap_open.h"
  28 #include "messages.h"
  29 #include "lib/util/util_tdb.h"
  30 #include "librpc/gen_ndr/ndr_smbXsrv.h"
  31 #include "serverid.h"
  32
  33 struct smbXsrv_tcon_table {
  34         struct {
  35                 struct db_context *db_ctx;
  36                 uint32_t lowest_id;
  37                 uint32_t highest_id;
  38                 uint32_t max_tcons;
  39                 uint32_t num_tcons;
  40         } local;
  41         struct {
  42                 struct db_context *db_ctx;
  43         } global;
  44 };
  45
  46 static struct db_context *smbXsrv_tcon_global_db_ctx = NULL;
  47
  48 NTSTATUS smbXsrv_tcon_global_init(void)
  49 {
  50         char *global_path = NULL;
  51         struct db_context *db_ctx = NULL;
  52
  53         if (smbXsrv_tcon_global_db_ctx != NULL) {
  54                 return NT_STATUS_OK;
  55         }
  56
  57         global_path = lock_path("smbXsrv_tcon_global.tdb");
  58         if (global_path == NULL) {
  59                 return NT_STATUS_NO_MEMORY;
  60         }
  61
  62         db_ctx = db_open(NULL, global_path,
  63                          0, /* hash_size */
  64                          TDB_DEFAULT |
  65                          TDB_CLEAR_IF_FIRST |
  66                          TDB_INCOMPATIBLE_HASH,
  67                          O_RDWR | O_CREAT, 0600,
  68                          DBWRAP_LOCK_ORDER_1,
  69                          DBWRAP_FLAG_NONE);
  70         TALLOC_FREE(global_path);
  71         if (db_ctx == NULL) {
  72                 NTSTATUS status;
  73
  74                 status = map_nt_error_from_unix_common(errno);
  75
  76                 return status;
  77         }
  78
  79         smbXsrv_tcon_global_db_ctx = db_ctx;
  80
  81         return NT_STATUS_OK;
  82 }
  83
  84 /*
  85  * NOTE:
  86  * We need to store the keys in big endian so that dbwrap_rbt's memcmp
  87  * has the same result as integer comparison between the uint32_t
  88  * values.
  89  *
  90  * TODO: implement string based key
  91  */
  92
  93 #define SMBXSRV_TCON_GLOBAL_TDB_KEY_SIZE sizeof(uint32_t)
  94
  95 static TDB_DATA smbXsrv_tcon_global_id_to_key(uint32_t id,
  96                                               uint8_t *key_buf)
  97 {
  98         TDB_DATA key;
  99
 100         RSIVAL(key_buf, 0, id);
 101
 102         key = make_tdb_data(key_buf, SMBXSRV_TCON_GLOBAL_TDB_KEY_SIZE);
 103
 104         return key;
 105 }
 106
 107 #if 0
 108 static NTSTATUS smbXsrv_tcon_global_key_to_id(TDB_DATA key, uint32_t *id)
 109 {
 110         if (id == NULL) {
 111                 return NT_STATUS_INVALID_PARAMETER;
 112         }
 113
 114         if (key.dsize != SMBXSRV_TCON_GLOBAL_TDB_KEY_SIZE) {
 115                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 116         }
 117
 118         *id = RIVAL(key.dptr, 0);
 119
 120         return NT_STATUS_OK;
 121 }
 122 #endif
 123
 124 #define SMBXSRV_TCON_LOCAL_TDB_KEY_SIZE sizeof(uint32_t)
 125
 126 static TDB_DATA smbXsrv_tcon_local_id_to_key(uint32_t id,
 127                                              uint8_t *key_buf)
 128 {
 129         TDB_DATA key;
 130
 131         RSIVAL(key_buf, 0, id);
 132
 133         key = make_tdb_data(key_buf, SMBXSRV_TCON_LOCAL_TDB_KEY_SIZE);
 134
 135         return key;
 136 }
 137
 138 static NTSTATUS smbXsrv_tcon_local_key_to_id(TDB_DATA key, uint32_t *id)
 139 {
 140         if (id == NULL) {
 141                 return NT_STATUS_INVALID_PARAMETER;
 142         }
 143
 144         if (key.dsize != SMBXSRV_TCON_LOCAL_TDB_KEY_SIZE) {
 145                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 146         }
 147
 148         *id = RIVAL(key.dptr, 0);
 149
 150         return NT_STATUS_OK;
 151 }
 152
 153 static struct db_record *smbXsrv_tcon_global_fetch_locked(
 154                         struct db_context *db,
 155                         uint32_t id,
 156                         TALLOC_CTX *mem_ctx)
 157 {
 158         TDB_DATA key;
 159         uint8_t key_buf[SMBXSRV_TCON_GLOBAL_TDB_KEY_SIZE];
 160         struct db_record *rec = NULL;
 161
 162         key = smbXsrv_tcon_global_id_to_key(id, key_buf);
 163
 164         rec = dbwrap_fetch_locked(db, mem_ctx, key);
 165
 166         if (rec == NULL) {
 167                 DBG_DEBUG("Failed to lock global id 0x%08x, key '%s'\n", id,
 168                           hex_encode_talloc(talloc_tos(), key.dptr, key.dsize));
 169         }
 170
 171         return rec;
 172 }
 173
 174 static struct db_record *smbXsrv_tcon_local_fetch_locked(
 175                         struct db_context *db,
 176                         uint32_t id,
 177                         TALLOC_CTX *mem_ctx)
 178 {
 179         TDB_DATA key;
 180         uint8_t key_buf[SMBXSRV_TCON_LOCAL_TDB_KEY_SIZE];
 181         struct db_record *rec = NULL;
 182
 183         key = smbXsrv_tcon_local_id_to_key(id, key_buf);
 184
 185         rec = dbwrap_fetch_locked(db, mem_ctx, key);
 186
 187         if (rec == NULL) {
 188                 DBG_DEBUG("Failed to lock local id 0x%08x, key '%s'\n", id,
 189                           hex_encode_talloc(talloc_tos(), key.dptr, key.dsize));
 190         }
 191
 192         return rec;
 193 }
 194
 195 static NTSTATUS smbXsrv_tcon_table_init(TALLOC_CTX *mem_ctx,
 196                                         struct smbXsrv_tcon_table *table,
 197                                         uint32_t lowest_id,
 198                                         uint32_t highest_id,
 199                                         uint32_t max_tcons)
 200 {
 201         NTSTATUS status;
 202         uint64_t max_range;
 203
 204         if (lowest_id > highest_id) {
 205                 return NT_STATUS_INTERNAL_ERROR;
 206         }
 207
 208         max_range = highest_id;
 209         max_range -= lowest_id;
 210         max_range += 1;
 211
 212         if (max_tcons > max_range) {
 213                 return NT_STATUS_INTERNAL_ERROR;
 214         }
 215
 216         ZERO_STRUCTP(table);
 217         table->local.db_ctx = db_open_rbt(table);
 218         if (table->local.db_ctx == NULL) {
 219                 return NT_STATUS_NO_MEMORY;
 220         }
 221         table->local.lowest_id = lowest_id;
 222         table->local.highest_id = highest_id;
 223         table->local.max_tcons = max_tcons;
 224
 225         status = smbXsrv_tcon_global_init();
 226         if (!NT_STATUS_IS_OK(status)) {
 227                 return status;
 228         }
 229
 230         table->global.db_ctx = smbXsrv_tcon_global_db_ctx;
 231
 232         return NT_STATUS_OK;
 233 }
 234
 235 struct smb1srv_tcon_local_allocate_state {
 236         const uint32_t lowest_id;
 237         const uint32_t highest_id;
 238         uint32_t last_id;
 239         uint32_t useable_id;
 240         NTSTATUS status;
 241 };
 242
 243 static int smb1srv_tcon_local_allocate_traverse(struct db_record *rec,
 244                                                    void *private_data)
 245 {
 246         struct smb1srv_tcon_local_allocate_state *state =
 247                 (struct smb1srv_tcon_local_allocate_state *)private_data;
 248         TDB_DATA key = dbwrap_record_get_key(rec);
 249         uint32_t id = 0;
 250         NTSTATUS status;
 251
 252         status = smbXsrv_tcon_local_key_to_id(key, &id);
 253         if (!NT_STATUS_IS_OK(status)) {
 254                 state->status = status;
 255                 return -1;
 256         }
 257
 258         if (id <= state->last_id) {
 259                 state->status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 260                 return -1;
 261         }
 262         state->last_id = id;
 263
 264         if (id > state->useable_id) {
 265                 state->status = NT_STATUS_OK;
 266                 return -1;
 267         }
 268
 269         if (state->useable_id == state->highest_id) {
 270                 state->status = NT_STATUS_INSUFFICIENT_RESOURCES;
 271                 return -1;
 272         }
 273
 274         state->useable_id +=1;
 275         return 0;
 276 }
 277
 278 static NTSTATUS smb1srv_tcon_local_allocate_id(struct db_context *db,
 279                                                uint32_t lowest_id,
 280                                                uint32_t highest_id,
 281                                                TALLOC_CTX *mem_ctx,
 282                                                struct db_record **_rec,
 283                                                uint32_t *_id)
 284 {
 285         struct smb1srv_tcon_local_allocate_state state = {
 286                 .lowest_id = lowest_id,
 287                 .highest_id = highest_id,
 288                 .last_id = 0,
 289                 .useable_id = lowest_id,
 290                 .status = NT_STATUS_INTERNAL_ERROR,
 291         };
 292         uint32_t i;
 293         uint32_t range;
 294         NTSTATUS status;
 295         int count = 0;
 296
 297         *_rec = NULL;
 298         *_id = 0;
 299
 300         if (lowest_id > highest_id) {
 301                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 302         }
 303
 304         /*
 305          * first we try randomly
 306          */
 307         range = (highest_id - lowest_id) + 1;
 308
 309         for (i = 0; i < (range / 2); i++) {
 310                 uint32_t id;
 311                 TDB_DATA val;
 312                 struct db_record *rec = NULL;
 313
 314                 id = generate_random() % range;
 315                 id += lowest_id;
 316
 317                 if (id < lowest_id) {
 318                         id = lowest_id;
 319                 }
 320                 if (id > highest_id) {
 321                         id = highest_id;
 322                 }
 323
 324                 rec = smbXsrv_tcon_local_fetch_locked(db, id, mem_ctx);
 325                 if (rec == NULL) {
 326                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 327                 }
 328
 329                 val = dbwrap_record_get_value(rec);
 330                 if (val.dsize != 0) {
 331                         TALLOC_FREE(rec);
 332                         continue;
 333                 }
 334
 335                 *_rec = rec;
 336                 *_id = id;
 337                 return NT_STATUS_OK;
 338         }
 339
 340         /*
 341          * if the range is almost full,
 342          * we traverse the whole table
 343          * (this relies on sorted behavior of dbwrap_rbt)
 344          */
 345         status = dbwrap_traverse_read(db, smb1srv_tcon_local_allocate_traverse,
 346                                       &state, &count);
 347         if (NT_STATUS_IS_OK(status)) {
 348                 if (NT_STATUS_IS_OK(state.status)) {
 349                         return NT_STATUS_INTERNAL_ERROR;
 350                 }
 351
 352                 if (!NT_STATUS_EQUAL(state.status, NT_STATUS_INTERNAL_ERROR)) {
 353                         return state.status;
 354                 }
 355
 356                 if (state.useable_id <= state.highest_id) {
 357                         state.status = NT_STATUS_OK;
 358                 } else {
 359                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 360                 }
 361         } else if (!NT_STATUS_EQUAL(status, NT_STATUS_INTERNAL_DB_CORRUPTION)) {
 362                 /*
 363                  * Here we really expect NT_STATUS_INTERNAL_DB_CORRUPTION!
 364                  *
 365                  * If we get anything else it is an error, because it
 366                  * means we did not manage to find a free slot in
 367                  * the db.
 368                  */
 369                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 370         }
 371
 372         if (NT_STATUS_IS_OK(state.status)) {
 373                 uint32_t id;
 374                 TDB_DATA val;
 375                 struct db_record *rec = NULL;
 376
 377                 id = state.useable_id;
 378
 379                 rec = smbXsrv_tcon_local_fetch_locked(db, id, mem_ctx);
 380                 if (rec == NULL) {
 381                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 382                 }
 383
 384                 val = dbwrap_record_get_value(rec);
 385                 if (val.dsize != 0) {
 386                         TALLOC_FREE(rec);
 387                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 388                 }
 389
 390                 *_rec = rec;
 391                 *_id = id;
 392                 return NT_STATUS_OK;
 393         }
 394
 395         return state.status;
 396 }
 397
 398 struct smbXsrv_tcon_local_fetch_state {
 399         struct smbXsrv_tcon *tcon;
 400         NTSTATUS status;
 401 };
 402
 403 static void smbXsrv_tcon_local_fetch_parser(TDB_DATA key, TDB_DATA data,
 404                                             void *private_data)
 405 {
 406         struct smbXsrv_tcon_local_fetch_state *state =
 407                 (struct smbXsrv_tcon_local_fetch_state *)private_data;
 408         void *ptr;
 409
 410         if (data.dsize != sizeof(ptr)) {
 411                 state->status = NT_STATUS_INTERNAL_DB_ERROR;
 412                 return;
 413         }
 414
 415         memcpy(&ptr, data.dptr, data.dsize);
 416         state->tcon = talloc_get_type_abort(ptr, struct smbXsrv_tcon);
 417         state->status = NT_STATUS_OK;
 418 }
 419
 420 static NTSTATUS smbXsrv_tcon_local_lookup(struct smbXsrv_tcon_table *table,
 421                                           uint32_t tcon_local_id,
 422                                           NTTIME now,
 423                                           struct smbXsrv_tcon **_tcon)
 424 {
 425         struct smbXsrv_tcon_local_fetch_state state = {
 426                 .tcon = NULL,
 427                 .status = NT_STATUS_INTERNAL_ERROR,
 428         };
 429         uint8_t key_buf[SMBXSRV_TCON_LOCAL_TDB_KEY_SIZE];
 430         TDB_DATA key;
 431         NTSTATUS status;
 432
 433         *_tcon = NULL;
 434
 435         if (tcon_local_id == 0) {
 436                 return NT_STATUS_NETWORK_NAME_DELETED;
 437         }
 438
 439         if (table == NULL) {
 440                 /* this might happen before the end of negprot */
 441                 return NT_STATUS_NETWORK_NAME_DELETED;
 442         }
 443
 444         if (table->local.db_ctx == NULL) {
 445                 return NT_STATUS_INTERNAL_ERROR;
 446         }
 447
 448         key = smbXsrv_tcon_local_id_to_key(tcon_local_id, key_buf);
 449
 450         status = dbwrap_parse_record(table->local.db_ctx, key,
 451                                      smbXsrv_tcon_local_fetch_parser,
 452                                      &state);
 453         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 454                 return NT_STATUS_NETWORK_NAME_DELETED;
 455         } else if (!NT_STATUS_IS_OK(status)) {
 456                 return status;
 457         }
 458         if (!NT_STATUS_IS_OK(state.status)) {
 459                 return state.status;
 460         }
 461
 462         if (NT_STATUS_EQUAL(state.tcon->status, NT_STATUS_NETWORK_NAME_DELETED)) {
 463                 return NT_STATUS_NETWORK_NAME_DELETED;
 464         }
 465
 466         state.tcon->idle_time = now;
 467
 468         *_tcon = state.tcon;
 469         return state.tcon->status;
 470 }
 471
 472 static int smbXsrv_tcon_global_destructor(struct smbXsrv_tcon_global0 *global)
 473 {
 474         return 0;
 475 }
 476
 477 static void smbXsrv_tcon_global_verify_record(struct db_record *db_rec,
 478                                         bool *is_free,
 479                                         bool *was_free,
 480                                         TALLOC_CTX *mem_ctx,
 481                                         struct smbXsrv_tcon_global0 **_g);
 482
 483 static NTSTATUS smbXsrv_tcon_global_allocate(struct db_context *db,
 484                                         TALLOC_CTX *mem_ctx,
 485                                         struct smbXsrv_tcon_global0 **_global)
 486 {
 487         uint32_t i;
 488         struct smbXsrv_tcon_global0 *global = NULL;
 489         uint32_t last_free = 0;
 490         const uint32_t min_tries = 3;
 491
 492         *_global = NULL;
 493
 494         global = talloc_zero(mem_ctx, struct smbXsrv_tcon_global0);
 495         if (global == NULL) {
 496                 return NT_STATUS_NO_MEMORY;
 497         }
 498         talloc_set_destructor(global, smbXsrv_tcon_global_destructor);
 499
 500         /*
 501          * Here we just randomly try the whole 32-bit space
 502          *
 503          * We use just 32-bit, because we want to reuse the
 504          * ID for SRVSVC.
 505          */
 506         for (i = 0; i < UINT32_MAX; i++) {
 507                 bool is_free = false;
 508                 bool was_free = false;
 509                 uint32_t id;
 510
 511                 if (i >= min_tries && last_free != 0) {
 512                         id = last_free;
 513                 } else {
 514                         id = generate_random();
 515                 }
 516                 if (id == 0) {
 517                         id++;
 518                 }
 519                 if (id == UINT32_MAX) {
 520                         id--;
 521                 }
 522
 523                 global->db_rec = smbXsrv_tcon_global_fetch_locked(db, id,
 524                                                                   mem_ctx);
 525                 if (global->db_rec == NULL) {
 526                         talloc_free(global);
 527                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 528                 }
 529
 530                 smbXsrv_tcon_global_verify_record(global->db_rec,
 531                                                   &is_free,
 532                                                   &was_free,
 533                                                   NULL, NULL);
 534
 535                 if (!is_free) {
 536                         TALLOC_FREE(global->db_rec);
 537                         continue;
 538                 }
 539
 540                 if (!was_free && i < min_tries) {
 541                         /*
 542                          * The session_id is free now,
 543                          * but was not free before.
 544                          *
 545                          * This happens if a smbd crashed
 546                          * and did not cleanup the record.
 547                          *
 548                          * If this is one of our first tries,
 549                          * then we try to find a real free one.
 550                          */
 551                         if (last_free == 0) {
 552                                 last_free = id;
 553                         }
 554                         TALLOC_FREE(global->db_rec);
 555                         continue;
 556                 }
 557
 558                 global->tcon_global_id = id;
 559
 560                 *_global = global;
 561                 return NT_STATUS_OK;
 562         }
 563
 564         /* should not be reached */
 565         talloc_free(global);
 566         return NT_STATUS_INTERNAL_ERROR;
 567 }
 568
 569 static void smbXsrv_tcon_global_verify_record(struct db_record *db_rec,
 570                                         bool *is_free,
 571                                         bool *was_free,
 572                                         TALLOC_CTX *mem_ctx,
 573                                         struct smbXsrv_tcon_global0 **_g)
 574 {
 575         TDB_DATA key;
 576         TDB_DATA val;
 577         DATA_BLOB blob;
 578         struct smbXsrv_tcon_globalB global_blob;
 579         enum ndr_err_code ndr_err;
 580         struct smbXsrv_tcon_global0 *global = NULL;
 581         bool exists;
 582         TALLOC_CTX *frame = talloc_stackframe();
 583
 584         *is_free = false;
 585
 586         if (was_free) {
 587                 *was_free = false;
 588         }
 589         if (_g) {
 590                 *_g = NULL;
 591         }
 592
 593         key = dbwrap_record_get_key(db_rec);
 594
 595         val = dbwrap_record_get_value(db_rec);
 596         if (val.dsize == 0) {
 597                 TALLOC_FREE(frame);
 598                 *is_free = true;
 599                 if (was_free) {
 600                         *was_free = true;
 601                 }
 602                 return;
 603         }
 604
 605         blob = data_blob_const(val.dptr, val.dsize);
 606
 607         ndr_err = ndr_pull_struct_blob(&blob, frame, &global_blob,
 608                         (ndr_pull_flags_fn_t)ndr_pull_smbXsrv_tcon_globalB);
 609         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 610                 NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
 611                 DEBUG(1,("smbXsrv_tcon_global_verify_record: "
 612                          "key '%s' ndr_pull_struct_blob - %s\n",
 613                          hex_encode_talloc(frame, key.dptr, key.dsize),
 614                          nt_errstr(status)));
 615                 TALLOC_FREE(frame);
 616                 return;
 617         }
 618
 619         DEBUG(10,("smbXsrv_tcon_global_verify_record\n"));
 620         if (DEBUGLVL(10)) {
 621                 NDR_PRINT_DEBUG(smbXsrv_tcon_globalB, &global_blob);
 622         }
 623
 624         if (global_blob.version != SMBXSRV_VERSION_0) {
 625                 DEBUG(0,("smbXsrv_tcon_global_verify_record: "
 626                          "key '%s' use unsupported version %u\n",
 627                          hex_encode_talloc(frame, key.dptr, key.dsize),
 628                          global_blob.version));
 629                 NDR_PRINT_DEBUG(smbXsrv_tcon_globalB, &global_blob);
 630                 TALLOC_FREE(frame);
 631                 return;
 632         }
 633
 634         global = global_blob.info.info0;
 635
 636         exists = serverid_exists(&global->server_id);
 637         if (!exists) {
 638                 struct server_id_buf idbuf;
 639                 DEBUG(2,("smbXsrv_tcon_global_verify_record: "
 640                          "key '%s' server_id %s does not exist.\n",
 641                          hex_encode_talloc(frame, key.dptr, key.dsize),
 642                          server_id_str_buf(global->server_id, &idbuf)));
 643                 if (DEBUGLVL(2)) {
 644                         NDR_PRINT_DEBUG(smbXsrv_tcon_globalB, &global_blob);
 645                 }
 646                 TALLOC_FREE(frame);
 647                 dbwrap_record_delete(db_rec);
 648                 *is_free = true;
 649                 return;
 650         }
 651
 652         if (_g) {
 653                 *_g = talloc_move(mem_ctx, &global);
 654         }
 655         TALLOC_FREE(frame);
 656 }
 657
 658 static NTSTATUS smbXsrv_tcon_global_store(struct smbXsrv_tcon_global0 *global)
 659 {
 660         struct smbXsrv_tcon_globalB global_blob;
 661         DATA_BLOB blob = data_blob_null;
 662         TDB_DATA key;
 663         TDB_DATA val;
 664         NTSTATUS status;
 665         enum ndr_err_code ndr_err;
 666
 667         /*
 668          * TODO: if we use other versions than '0'
 669          * we would add glue code here, that would be able to
 670          * store the information in the old format.
 671          */
 672
 673         if (global->db_rec == NULL) {
 674                 return NT_STATUS_INTERNAL_ERROR;
 675         }
 676
 677         key = dbwrap_record_get_key(global->db_rec);
 678         val = dbwrap_record_get_value(global->db_rec);
 679
 680         ZERO_STRUCT(global_blob);
 681         global_blob.version = smbXsrv_version_global_current();
 682         if (val.dsize >= 8) {
 683                 global_blob.seqnum = IVAL(val.dptr, 4);
 684         }
 685         global_blob.seqnum += 1;
 686         global_blob.info.info0 = global;
 687
 688         ndr_err = ndr_push_struct_blob(&blob, global->db_rec, &global_blob,
 689                         (ndr_push_flags_fn_t)ndr_push_smbXsrv_tcon_globalB);
 690         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 691                 status = ndr_map_error2ntstatus(ndr_err);
 692                 DEBUG(1,("smbXsrv_tcon_global_store: key '%s' ndr_push - %s\n",
 693                          hex_encode_talloc(global->db_rec, key.dptr, key.dsize),
 694                          nt_errstr(status)));
 695                 TALLOC_FREE(global->db_rec);
 696                 return status;
 697         }
 698
 699         val = make_tdb_data(blob.data, blob.length);
 700         status = dbwrap_record_store(global->db_rec, val, TDB_REPLACE);
 701         if (!NT_STATUS_IS_OK(status)) {
 702                 DEBUG(1,("smbXsrv_tcon_global_store: key '%s' store - %s\n",
 703                          hex_encode_talloc(global->db_rec, key.dptr, key.dsize),
 704                          nt_errstr(status)));
 705                 TALLOC_FREE(global->db_rec);
 706                 return status;
 707         }
 708
 709         if (DEBUGLVL(10)) {
 710                 DEBUG(10,("smbXsrv_tcon_global_store: key '%s' stored\n",
 711                          hex_encode_talloc(global->db_rec, key.dptr, key.dsize)));
 712                 NDR_PRINT_DEBUG(smbXsrv_tcon_globalB, &global_blob);
 713         }
 714
 715         TALLOC_FREE(global->db_rec);
 716
 717         return NT_STATUS_OK;
 718 }
 719
 720 static int smbXsrv_tcon_destructor(struct smbXsrv_tcon *tcon)
 721 {
 722         NTSTATUS status;
 723
 724         status = smbXsrv_tcon_disconnect(tcon, 0);
 725         if (!NT_STATUS_IS_OK(status)) {
 726                 DEBUG(0, ("smbXsrv_tcon_destructor: "
 727                           "smbXsrv_tcon_disconnect() failed - %s\n",
 728                           nt_errstr(status)));
 729         }
 730
 731         TALLOC_FREE(tcon->global);
 732
 733         return 0;
 734 }
 735
 736 static NTSTATUS smbXsrv_tcon_create(struct smbXsrv_tcon_table *table,
 737                                     enum protocol_types protocol,
 738                                     struct server_id server_id,
 739                                     NTTIME now,
 740                                     struct smbXsrv_tcon **_tcon)
 741 {
 742         struct db_record *local_rec = NULL;
 743         struct smbXsrv_tcon *tcon = NULL;
 744         void *ptr = NULL;
 745         TDB_DATA val;
 746         struct smbXsrv_tcon_global0 *global = NULL;
 747         NTSTATUS status;
 748
 749         if (table->local.num_tcons >= table->local.max_tcons) {
 750                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 751         }
 752
 753         tcon = talloc_zero(table, struct smbXsrv_tcon);
 754         if (tcon == NULL) {
 755                 return NT_STATUS_NO_MEMORY;
 756         }
 757         tcon->table = table;
 758         tcon->status = NT_STATUS_INTERNAL_ERROR;
 759         tcon->idle_time = now;
 760
 761         status = smbXsrv_tcon_global_allocate(table->global.db_ctx,
 762                                               tcon, &global);
 763         if (!NT_STATUS_IS_OK(status)) {
 764                 TALLOC_FREE(tcon);
 765                 return status;
 766         }
 767         tcon->global = global;
 768
 769         if (protocol >= PROTOCOL_SMB2_02) {
 770                 uint64_t id = global->tcon_global_id;
 771
 772                 global->tcon_wire_id = id;
 773
 774                 tcon->local_id = global->tcon_global_id;
 775
 776                 local_rec = smbXsrv_tcon_local_fetch_locked(table->local.db_ctx,
 777                                                         tcon->local_id,
 778                                                         tcon /* TALLOC_CTX */);
 779                 if (local_rec == NULL) {
 780                         TALLOC_FREE(tcon);
 781                         return NT_STATUS_NO_MEMORY;
 782                 }
 783
 784                 val = dbwrap_record_get_value(local_rec);
 785                 if (val.dsize != 0) {
 786                         TALLOC_FREE(tcon);
 787                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 788                 }
 789         } else {
 790
 791                 status = smb1srv_tcon_local_allocate_id(table->local.db_ctx,
 792                                                         table->local.lowest_id,
 793                                                         table->local.highest_id,
 794                                                         tcon,
 795                                                         &local_rec,
 796                                                         &tcon->local_id);
 797                 if (!NT_STATUS_IS_OK(status)) {
 798                         TALLOC_FREE(tcon);
 799                         return status;
 800                 }
 801
 802                 global->tcon_wire_id = tcon->local_id;
 803         }
 804
 805         global->creation_time = now;
 806
 807         global->server_id = server_id;
 808
 809         ptr = tcon;
 810         val = make_tdb_data((uint8_t const *)&ptr, sizeof(ptr));
 811         status = dbwrap_record_store(local_rec, val, TDB_REPLACE);
 812         TALLOC_FREE(local_rec);
 813         if (!NT_STATUS_IS_OK(status)) {
 814                 TALLOC_FREE(tcon);
 815                 return status;
 816         }
 817         table->local.num_tcons += 1;
 818
 819         talloc_set_destructor(tcon, smbXsrv_tcon_destructor);
 820
 821         status = smbXsrv_tcon_global_store(global);
 822         if (!NT_STATUS_IS_OK(status)) {
 823                 DEBUG(0,("smbXsrv_tcon_create: "
 824                          "global_id (0x%08x) store failed - %s\n",
 825                          tcon->global->tcon_global_id,
 826                          nt_errstr(status)));
 827                 TALLOC_FREE(tcon);
 828                 return status;
 829         }
 830
 831         if (DEBUGLVL(10)) {
 832                 struct smbXsrv_tconB tcon_blob;
 833
 834                 ZERO_STRUCT(tcon_blob);
 835                 tcon_blob.version = SMBXSRV_VERSION_0;
 836                 tcon_blob.info.info0 = tcon;
 837
 838                 DEBUG(10,("smbXsrv_tcon_create: global_id (0x%08x) stored\n",
 839                          tcon->global->tcon_global_id));
 840                 NDR_PRINT_DEBUG(smbXsrv_tconB, &tcon_blob);
 841         }
 842
 843         *_tcon = tcon;
 844         return NT_STATUS_OK;
 845 }
 846
 847 NTSTATUS smbXsrv_tcon_update(struct smbXsrv_tcon *tcon)
 848 {
 849         struct smbXsrv_tcon_table *table = tcon->table;
 850         NTSTATUS status;
 851
 852         if (tcon->global->db_rec != NULL) {
 853                 DEBUG(0, ("smbXsrv_tcon_update(0x%08x): "
 854                           "Called with db_rec != NULL'\n",
 855                           tcon->global->tcon_global_id));
 856                 return NT_STATUS_INTERNAL_ERROR;
 857         }
 858
 859         tcon->global->db_rec = smbXsrv_tcon_global_fetch_locked(
 860                                                 table->global.db_ctx,
 861                                                 tcon->global->tcon_global_id,
 862                                                 tcon->global /* TALLOC_CTX */);
 863         if (tcon->global->db_rec == NULL) {
 864                 return NT_STATUS_INTERNAL_DB_ERROR;
 865         }
 866
 867         status = smbXsrv_tcon_global_store(tcon->global);
 868         if (!NT_STATUS_IS_OK(status)) {
 869                 DEBUG(0,("smbXsrv_tcon_update: "
 870                          "global_id (0x%08x) store failed - %s\n",
 871                          tcon->global->tcon_global_id,
 872                          nt_errstr(status)));
 873                 return status;
 874         }
 875
 876         if (DEBUGLVL(10)) {
 877                 struct smbXsrv_tconB tcon_blob;
 878
 879                 ZERO_STRUCT(tcon_blob);
 880                 tcon_blob.version = SMBXSRV_VERSION_0;
 881                 tcon_blob.info.info0 = tcon;
 882
 883                 DEBUG(10,("smbXsrv_tcon_update: global_id (0x%08x) stored\n",
 884                           tcon->global->tcon_global_id));
 885                 NDR_PRINT_DEBUG(smbXsrv_tconB, &tcon_blob);
 886         }
 887
 888         return NT_STATUS_OK;
 889 }
 890
 891 NTSTATUS smbXsrv_tcon_disconnect(struct smbXsrv_tcon *tcon, uint64_t vuid)
 892 {
 893         struct smbXsrv_tcon_table *table;
 894         struct db_record *local_rec = NULL;
 895         struct db_record *global_rec = NULL;
 896         NTSTATUS status;
 897         NTSTATUS error = NT_STATUS_OK;
 898
 899         if (tcon->table == NULL) {
 900                 return NT_STATUS_OK;
 901         }
 902
 903         table = tcon->table;
 904         tcon->table = NULL;
 905
 906         tcon->status = NT_STATUS_NETWORK_NAME_DELETED;
 907
 908         global_rec = tcon->global->db_rec;
 909         tcon->global->db_rec = NULL;
 910         if (global_rec == NULL) {
 911                 global_rec = smbXsrv_tcon_global_fetch_locked(
 912                                                 table->global.db_ctx,
 913                                                 tcon->global->tcon_global_id,
 914                                                 tcon->global /* TALLOC_CTX */);
 915                 if (global_rec == NULL) {
 916                         error = NT_STATUS_INTERNAL_ERROR;
 917                 }
 918         }
 919
 920         if (global_rec != NULL) {
 921                 status = dbwrap_record_delete(global_rec);
 922                 if (!NT_STATUS_IS_OK(status)) {
 923                         TDB_DATA key = dbwrap_record_get_key(global_rec);
 924
 925                         DEBUG(0, ("smbXsrv_tcon_disconnect(0x%08x, '%s'): "
 926                                   "failed to delete global key '%s': %s\n",
 927                                   tcon->global->tcon_global_id,
 928                                   tcon->global->share_name,
 929                                   hex_encode_talloc(global_rec, key.dptr,
 930                                                     key.dsize),
 931                                   nt_errstr(status)));
 932                         error = status;
 933                 }
 934         }
 935         TALLOC_FREE(global_rec);
 936
 937         local_rec = tcon->db_rec;
 938         if (local_rec == NULL) {
 939                 local_rec = smbXsrv_tcon_local_fetch_locked(table->local.db_ctx,
 940                                                         tcon->local_id,
 941                                                         tcon /* TALLOC_CTX */);
 942                 if (local_rec == NULL) {
 943                         error = NT_STATUS_INTERNAL_ERROR;
 944                 }
 945         }
 946
 947         if (local_rec != NULL) {
 948                 status = dbwrap_record_delete(local_rec);
 949                 if (!NT_STATUS_IS_OK(status)) {
 950                         TDB_DATA key = dbwrap_record_get_key(local_rec);
 951
 952                         DEBUG(0, ("smbXsrv_tcon_disconnect(0x%08x, '%s'): "
 953                                   "failed to delete local key '%s': %s\n",
 954                                   tcon->global->tcon_global_id,
 955                                   tcon->global->share_name,
 956                                   hex_encode_talloc(local_rec, key.dptr,
 957                                                     key.dsize),
 958                                   nt_errstr(status)));
 959                         error = status;
 960                 }
 961                 table->local.num_tcons -= 1;
 962         }
 963         if (tcon->db_rec == NULL) {
 964                 TALLOC_FREE(local_rec);
 965         }
 966         tcon->db_rec = NULL;
 967
 968         if (tcon->compat) {
 969                 bool ok;
 970
 971                 ok = set_current_service(tcon->compat, 0, true);
 972                 if (!ok) {
 973                         status = NT_STATUS_INTERNAL_ERROR;
 974                         DEBUG(0, ("smbXsrv_tcon_disconnect(0x%08x, '%s'): "
 975                                   "set_current_service() failed: %s\n",
 976                                   tcon->global->tcon_global_id,
 977                                   tcon->global->share_name,
 978                                   nt_errstr(status)));
 979                         tcon->compat = NULL;
 980                         return status;
 981                 }
 982
 983                 close_cnum(tcon->compat, vuid);
 984                 tcon->compat = NULL;
 985         }
 986
 987         return error;
 988 }
 989
 990 struct smbXsrv_tcon_disconnect_all_state {
 991         uint64_t vuid;
 992         NTSTATUS first_status;
 993         int errors;
 994 };
 995
 996 static int smbXsrv_tcon_disconnect_all_callback(struct db_record *local_rec,
 997                                                 void *private_data);
 998
 999 static NTSTATUS smbXsrv_tcon_disconnect_all(struct smbXsrv_tcon_table *table,
1000                                             uint64_t vuid)
1001 {
1002         struct smbXsrv_tcon_disconnect_all_state state;
1003         NTSTATUS status;
1004         int count = 0;
1005
1006         if (table == NULL) {
1007                 return NT_STATUS_OK;
1008         }
1009
1010         ZERO_STRUCT(state);
1011         state.vuid = vuid;
1012
1013         status = dbwrap_traverse(table->local.db_ctx,
1014                                  smbXsrv_tcon_disconnect_all_callback,
1015                                  &state, &count);
1016         if (!NT_STATUS_IS_OK(status)) {
1017                 DEBUG(0, ("smbXsrv_tcon_disconnect_all: "
1018                           "dbwrap_traverse() failed: %s\n",
1019                           nt_errstr(status)));
1020                 return status;
1021         }
1022
1023         if (!NT_STATUS_IS_OK(state.first_status)) {
1024                 DEBUG(0, ("smbXsrv_tcon_disconnect_all: "
1025                           "count[%d] errors[%d] first[%s]\n",
1026                           count, state.errors,
1027                           nt_errstr(state.first_status)));
1028                 return state.first_status;
1029         }
1030
1031         return NT_STATUS_OK;
1032 }
1033
1034 static int smbXsrv_tcon_disconnect_all_callback(struct db_record *local_rec,
1035                                                 void *private_data)
1036 {
1037         struct smbXsrv_tcon_disconnect_all_state *state =
1038                 (struct smbXsrv_tcon_disconnect_all_state *)private_data;
1039         TDB_DATA val;
1040         void *ptr = NULL;
1041         struct smbXsrv_tcon *tcon = NULL;
1042         uint64_t vuid;
1043         NTSTATUS status;
1044
1045         val = dbwrap_record_get_value(local_rec);
1046         if (val.dsize != sizeof(ptr)) {
1047                 status = NT_STATUS_INTERNAL_ERROR;
1048                 if (NT_STATUS_IS_OK(state->first_status)) {
1049                         state->first_status = status;
1050                 }
1051                 state->errors++;
1052                 return 0;
1053         }
1054
1055         memcpy(&ptr, val.dptr, val.dsize);
1056         tcon = talloc_get_type_abort(ptr, struct smbXsrv_tcon);
1057
1058         vuid = state->vuid;
1059         if (vuid == 0 && tcon->compat) {
1060                 vuid = tcon->compat->vuid;
1061         }
1062
1063         tcon->db_rec = local_rec;
1064         status = smbXsrv_tcon_disconnect(tcon, vuid);
1065         if (!NT_STATUS_IS_OK(status)) {
1066                 if (NT_STATUS_IS_OK(state->first_status)) {
1067                         state->first_status = status;
1068                 }
1069                 state->errors++;
1070                 return 0;
1071         }
1072
1073         return 0;
1074 }
1075
1076 NTSTATUS smb1srv_tcon_table_init(struct smbXsrv_connection *conn)
1077 {
1078         struct smbXsrv_client *client = conn->client;
1079
1080         /*
1081          * Allow a range from 1..65534 with 65534 values.
1082          */
1083         client->tcon_table = talloc_zero(client, struct smbXsrv_tcon_table);
1084         if (client->tcon_table == NULL) {
1085                 return NT_STATUS_NO_MEMORY;
1086         }
1087
1088         return smbXsrv_tcon_table_init(client, client->tcon_table,
1089                                        1, UINT16_MAX - 1,
1090                                        UINT16_MAX - 1);
1091 }
1092
1093 NTSTATUS smb1srv_tcon_create(struct smbXsrv_connection *conn,
1094                              NTTIME now,
1095                              struct smbXsrv_tcon **_tcon)
1096 {
1097         struct server_id id = messaging_server_id(conn->msg_ctx);
1098
1099         return smbXsrv_tcon_create(conn->client->tcon_table,
1100                                    conn->protocol,
1101                                    id, now, _tcon);
1102 }
1103
1104 NTSTATUS smb1srv_tcon_lookup(struct smbXsrv_connection *conn,
1105                              uint16_t tree_id, NTTIME now,
1106                              struct smbXsrv_tcon **tcon)
1107 {
1108         uint32_t local_id = tree_id;
1109
1110         return smbXsrv_tcon_local_lookup(conn->client->tcon_table,
1111                                          local_id, now, tcon);
1112 }
1113
1114 NTSTATUS smb1srv_tcon_disconnect_all(struct smbXsrv_connection *conn)
1115 {
1116         struct smbXsrv_client *client = conn->client;
1117
1118         /*
1119          * We do not pass a vuid here,
1120          * which means the vuid is taken from
1121          * the tcon->compat->vuid.
1122          *
1123          * NOTE: that tcon->compat->vuid may point to
1124          * a none existing vuid (or the wrong one)
1125          * as the tcon can exist without a session
1126          * in SMB1.
1127          *
1128          * This matches the old behavior of
1129          * conn_close_all(), but we should think
1130          * about how to fix this in future.
1131          */
1132         return smbXsrv_tcon_disconnect_all(client->tcon_table, 0);
1133 }
1134
1135 NTSTATUS smb2srv_tcon_table_init(struct smbXsrv_session *session)
1136 {
1137         /*
1138          * Allow a range from 1..4294967294 with 65534 (same as SMB1) values.
1139          */
1140         session->tcon_table = talloc_zero(session, struct smbXsrv_tcon_table);
1141         if (session->tcon_table == NULL) {
1142                 return NT_STATUS_NO_MEMORY;
1143         }
1144
1145         return smbXsrv_tcon_table_init(session, session->tcon_table,
1146                                        1, UINT32_MAX - 1,
1147                                        UINT16_MAX - 1);
1148 }
1149
1150 NTSTATUS smb2srv_tcon_create(struct smbXsrv_session *session,
1151                              NTTIME now,
1152                              struct smbXsrv_tcon **_tcon)
1153 {
1154         struct server_id id = messaging_server_id(session->client->msg_ctx);
1155
1156         return smbXsrv_tcon_create(session->tcon_table,
1157                                    PROTOCOL_SMB2_02,
1158                                    id, now, _tcon);
1159 }
1160
1161 NTSTATUS smb2srv_tcon_lookup(struct smbXsrv_session *session,
1162                              uint32_t tree_id, NTTIME now,
1163                              struct smbXsrv_tcon **tcon)
1164 {
1165         uint32_t local_id = tree_id;
1166
1167         return smbXsrv_tcon_local_lookup(session->tcon_table,
1168                                          local_id, now, tcon);
1169 }
1170
1171 NTSTATUS smb2srv_tcon_disconnect_all(struct smbXsrv_session *session)
1172 {
1173         uint64_t vuid;
1174
1175         if (session->compat) {
1176                 vuid = session->compat->vuid;
1177         } else {
1178                 vuid = 0;
1179         }
1180
1181         return smbXsrv_tcon_disconnect_all(session->tcon_table, vuid);
1182 }
1183
1184 struct smbXsrv_tcon_global_traverse_state {
1185         int (*fn)(struct smbXsrv_tcon_global0 *, void *);
1186         void *private_data;
1187 };
1188
1189 static int smbXsrv_tcon_global_traverse_fn(struct db_record *rec, void *data)
1190 {
1191         int ret = -1;
1192         struct smbXsrv_tcon_global_traverse_state *state =
1193                 (struct smbXsrv_tcon_global_traverse_state*)data;
1194         TDB_DATA key = dbwrap_record_get_key(rec);
1195         TDB_DATA val = dbwrap_record_get_value(rec);
1196         DATA_BLOB blob = data_blob_const(val.dptr, val.dsize);
1197         struct smbXsrv_tcon_globalB global_blob;
1198         enum ndr_err_code ndr_err;
1199         TALLOC_CTX *frame = talloc_stackframe();
1200
1201         ndr_err = ndr_pull_struct_blob(&blob, frame, &global_blob,
1202                         (ndr_pull_flags_fn_t)ndr_pull_smbXsrv_tcon_globalB);
1203         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1204                 DEBUG(1,("Invalid record in smbXsrv_tcon_global.tdb:"
1205                          "key '%s' ndr_pull_struct_blob - %s\n",
1206                          hex_encode_talloc(frame, key.dptr, key.dsize),
1207                          ndr_errstr(ndr_err)));
1208                 goto done;
1209         }
1210
1211         if (global_blob.version != SMBXSRV_VERSION_0) {
1212                 DEBUG(1,("Invalid record in smbXsrv_tcon_global.tdb:"
1213                          "key '%s' unsuported version - %d\n",
1214                          hex_encode_talloc(frame, key.dptr, key.dsize),
1215                          (int)global_blob.version));
1216                 goto done;
1217         }
1218
1219         global_blob.info.info0->db_rec = rec;
1220         ret = state->fn(global_blob.info.info0, state->private_data);
1221 done:
1222         TALLOC_FREE(frame);
1223         return ret;
1224 }
1225
1226 NTSTATUS smbXsrv_tcon_global_traverse(
1227                         int (*fn)(struct smbXsrv_tcon_global0 *, void *),
1228                         void *private_data)
1229 {
1230         NTSTATUS status;
1231         int count = 0;
1232         struct smbXsrv_tcon_global_traverse_state state = {
1233                 .fn = fn,
1234                 .private_data = private_data,
1235         };
1236
1237         become_root();
1238         status = smbXsrv_tcon_global_init();
1239         if (!NT_STATUS_IS_OK(status)) {
1240                 unbecome_root();
1241                 DEBUG(0, ("Failed to initialize tcon_global: %s\n",
1242                           nt_errstr(status)));
1243                 return status;
1244         }
1245
1246         status = dbwrap_traverse_read(smbXsrv_tcon_global_db_ctx,
1247                                       smbXsrv_tcon_global_traverse_fn,
1248                                       &state,
1249                                       &count);
1250         unbecome_root();
1251
1252         return status;
1253 }