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