source3/smbd/smb2_lock.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6    Copyright (C) Jeremy Allison 2010
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../libcli/smb/smb_common.h"
  26 #include "../lib/util/tevent_ntstatus.h"
  27 #include "messages.h"
  28
  29 struct smbd_smb2_lock_element {
  30         uint64_t offset;
  31         uint64_t length;
  32         uint32_t flags;
  33 };
  34
  35 struct smbd_smb2_lock_state {
  36         struct smbd_smb2_request *smb2req;
  37         struct smb_request *smb1req;
  38         struct blocking_lock_record *blr;
  39         uint16_t lock_count;
  40         struct smbd_lock_element *locks;
  41 };
  42
  43 static void remove_pending_lock(struct smbd_smb2_lock_state *state,
  44                                 struct blocking_lock_record *blr);
  45
  46 static struct tevent_req *smbd_smb2_lock_send(TALLOC_CTX *mem_ctx,
  47                                                  struct tevent_context *ev,
  48                                                  struct smbd_smb2_request *smb2req,
  49                                                  struct files_struct *in_fsp,
  50                                                  uint16_t in_lock_count,
  51                                                  struct smbd_smb2_lock_element *in_locks);
  52 static NTSTATUS smbd_smb2_lock_recv(struct tevent_req *req);
  53
  54 static void smbd_smb2_request_lock_done(struct tevent_req *subreq);
  55 NTSTATUS smbd_smb2_request_process_lock(struct smbd_smb2_request *req)
  56 {
  57         const uint8_t *inbody;
  58         uint16_t in_lock_count;
  59         uint64_t in_file_id_persistent;
  60         uint64_t in_file_id_volatile;
  61         struct files_struct *in_fsp;
  62         struct smbd_smb2_lock_element *in_locks;
  63         struct tevent_req *subreq;
  64         const uint8_t *lock_buffer;
  65         uint16_t l;
  66         NTSTATUS status;
  67
  68         status = smbd_smb2_request_verify_sizes(req, 0x30);
  69         if (!NT_STATUS_IS_OK(status)) {
  70                 return smbd_smb2_request_error(req, status);
  71         }
  72         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  73
  74         in_lock_count                   = CVAL(inbody, 0x02);
  75         /* 0x04 - 4 bytes reserved */
  76         in_file_id_persistent           = BVAL(inbody, 0x08);
  77         in_file_id_volatile             = BVAL(inbody, 0x10);
  78
  79         if (in_lock_count < 1) {
  80                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  81         }
  82
  83         if (((in_lock_count - 1) * 0x18) > SMBD_SMB2_IN_DYN_LEN(req)) {
  84                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  85         }
  86
  87         in_locks = talloc_array(req, struct smbd_smb2_lock_element,
  88                                 in_lock_count);
  89         if (in_locks == NULL) {
  90                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  91         }
  92
  93         l = 0;
  94         lock_buffer = inbody + 0x18;
  95
  96         in_locks[l].offset      = BVAL(lock_buffer, 0x00);
  97         in_locks[l].length      = BVAL(lock_buffer, 0x08);
  98         in_locks[l].flags       = IVAL(lock_buffer, 0x10);
  99         /* 0x14 - 4 reserved bytes */
 100
 101         lock_buffer = SMBD_SMB2_IN_DYN_PTR(req);
 102
 103         for (l=1; l < in_lock_count; l++) {
 104                 in_locks[l].offset      = BVAL(lock_buffer, 0x00);
 105                 in_locks[l].length      = BVAL(lock_buffer, 0x08);
 106                 in_locks[l].flags       = IVAL(lock_buffer, 0x10);
 107                 /* 0x14 - 4 reserved bytes */
 108
 109                 lock_buffer += 0x18;
 110         }
 111
 112         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
 113         if (in_fsp == NULL) {
 114                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 115         }
 116
 117         subreq = smbd_smb2_lock_send(req, req->sconn->ev_ctx,
 118                                      req, in_fsp,
 119                                      in_lock_count,
 120                                      in_locks);
 121         if (subreq == NULL) {
 122                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 123         }
 124         tevent_req_set_callback(subreq, smbd_smb2_request_lock_done, req);
 125
 126         return smbd_smb2_request_pending_queue(req, subreq, 500);
 127 }
 128
 129 static void smbd_smb2_request_lock_done(struct tevent_req *subreq)
 130 {
 131         struct smbd_smb2_request *smb2req = tevent_req_callback_data(subreq,
 132                                         struct smbd_smb2_request);
 133         DATA_BLOB outbody;
 134         NTSTATUS status;
 135         NTSTATUS error; /* transport error */
 136
 137         status = smbd_smb2_lock_recv(subreq);
 138         TALLOC_FREE(subreq);
 139         if (!NT_STATUS_IS_OK(status)) {
 140                 error = smbd_smb2_request_error(smb2req, status);
 141                 if (!NT_STATUS_IS_OK(error)) {
 142                         smbd_server_connection_terminate(smb2req->sconn,
 143                                                          nt_errstr(error));
 144                         return;
 145                 }
 146                 return;
 147         }
 148
 149         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x04);
 150         if (outbody.data == NULL) {
 151                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 152                 if (!NT_STATUS_IS_OK(error)) {
 153                         smbd_server_connection_terminate(smb2req->sconn,
 154                                                          nt_errstr(error));
 155                         return;
 156                 }
 157                 return;
 158         }
 159
 160         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 161         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 162
 163         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 164         if (!NT_STATUS_IS_OK(error)) {
 165                 smbd_server_connection_terminate(smb2req->sconn,
 166                                                  nt_errstr(error));
 167                 return;
 168         }
 169 }
 170
 171 static struct tevent_req *smbd_smb2_lock_send(TALLOC_CTX *mem_ctx,
 172                                                  struct tevent_context *ev,
 173                                                  struct smbd_smb2_request *smb2req,
 174                                                  struct files_struct *fsp,
 175                                                  uint16_t in_lock_count,
 176                                                  struct smbd_smb2_lock_element *in_locks)
 177 {
 178         struct tevent_req *req;
 179         struct smbd_smb2_lock_state *state;
 180         struct smb_request *smb1req;
 181         int32_t timeout = -1;
 182         bool isunlock = false;
 183         uint16_t i;
 184         struct smbd_lock_element *locks;
 185         NTSTATUS status;
 186         bool async = false;
 187
 188         req = tevent_req_create(mem_ctx, &state,
 189                         struct smbd_smb2_lock_state);
 190         if (req == NULL) {
 191                 return NULL;
 192         }
 193         state->smb2req = smb2req;
 194         smb2req->subreq = req; /* So we can find this when going async. */
 195
 196         smb1req = smbd_smb2_fake_smb_request(smb2req);
 197         if (tevent_req_nomem(smb1req, req)) {
 198                 return tevent_req_post(req, ev);
 199         }
 200         state->smb1req = smb1req;
 201
 202         DEBUG(10,("smbd_smb2_lock_send: %s - %s\n",
 203                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 204
 205         locks = talloc_array(state, struct smbd_lock_element, in_lock_count);
 206         if (locks == NULL) {
 207                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 208                 return tevent_req_post(req, ev);
 209         }
 210
 211         switch (in_locks[0].flags) {
 212         case SMB2_LOCK_FLAG_SHARED:
 213         case SMB2_LOCK_FLAG_EXCLUSIVE:
 214                 if (in_lock_count > 1) {
 215                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 216                         return tevent_req_post(req, ev);
 217                 }
 218                 timeout = -1;
 219                 break;
 220
 221         case SMB2_LOCK_FLAG_SHARED|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 222         case SMB2_LOCK_FLAG_EXCLUSIVE|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 223                 timeout = 0;
 224                 break;
 225
 226         case SMB2_LOCK_FLAG_UNLOCK:
 227                 /* only the first lock gives the UNLOCK bit - see
 228                    MS-SMB2 3.3.5.14 */
 229                 isunlock = true;
 230                 timeout = 0;
 231                 break;
 232
 233         default:
 234                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 235                 return tevent_req_post(req, ev);
 236         }
 237
 238         for (i=0; i<in_lock_count; i++) {
 239                 bool invalid = false;
 240
 241                 switch (in_locks[i].flags) {
 242                 case SMB2_LOCK_FLAG_SHARED:
 243                 case SMB2_LOCK_FLAG_EXCLUSIVE:
 244                         if (isunlock) {
 245                                 invalid = true;
 246                                 break;
 247                         }
 248                         if (i > 0) {
 249                                 tevent_req_nterror(req,
 250                                                    NT_STATUS_INVALID_PARAMETER);
 251                                 return tevent_req_post(req, ev);
 252                         }
 253                         break;
 254
 255                 case SMB2_LOCK_FLAG_SHARED|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 256                 case SMB2_LOCK_FLAG_EXCLUSIVE|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 257                         if (isunlock) {
 258                                 invalid = true;
 259                         }
 260                         break;
 261
 262                 case SMB2_LOCK_FLAG_UNLOCK:
 263                         if (!isunlock) {
 264                                 tevent_req_nterror(req,
 265                                                    NT_STATUS_INVALID_PARAMETER);
 266                                 return tevent_req_post(req, ev);
 267                         }
 268                         break;
 269
 270                 default:
 271                         if (isunlock) {
 272                                 /*
 273                                  * is the first element was a UNLOCK
 274                                  * we need to deferr the error response
 275                                  * to the backend, because we need to process
 276                                  * all unlock elements before
 277                                  */
 278                                 invalid = true;
 279                                 break;
 280                         }
 281                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 282                         return tevent_req_post(req, ev);
 283                 }
 284
 285                 locks[i].smblctx = fsp->op->global->open_persistent_id;
 286                 locks[i].offset = in_locks[i].offset;
 287                 locks[i].count  = in_locks[i].length;
 288
 289                 if (in_locks[i].flags & SMB2_LOCK_FLAG_EXCLUSIVE) {
 290                         locks[i].brltype = WRITE_LOCK;
 291                 } else if (in_locks[i].flags & SMB2_LOCK_FLAG_SHARED) {
 292                         locks[i].brltype = READ_LOCK;
 293                 } else if (invalid) {
 294                         /*
 295                          * this is an invalid UNLOCK element
 296                          * and the backend needs to test for
 297                          * brltype != UNLOCK_LOCK and return
 298                          * NT_STATUS_INVALID_PARAMER
 299                          */
 300                         locks[i].brltype = READ_LOCK;
 301                 } else {
 302                         locks[i].brltype = UNLOCK_LOCK;
 303                 }
 304
 305                 DEBUG(10,("smbd_smb2_lock_send: index %d offset=%llu, count=%llu, "
 306                         "smblctx = %llu type %d\n",
 307                         i,
 308                         (unsigned long long)locks[i].offset,
 309                         (unsigned long long)locks[i].count,
 310                         (unsigned long long)locks[i].smblctx,
 311                         (int)locks[i].brltype ));
 312         }
 313
 314         state->locks = locks;
 315         state->lock_count = in_lock_count;
 316
 317         if (isunlock) {
 318                 status = smbd_do_locking(smb1req, fsp,
 319                                          0,
 320                                          timeout,
 321                                          in_lock_count,
 322                                          locks,
 323                                          0,
 324                                          NULL,
 325                                          &async);
 326         } else {
 327                 status = smbd_do_locking(smb1req, fsp,
 328                                          0,
 329                                          timeout,
 330                                          0,
 331                                          NULL,
 332                                          in_lock_count,
 333                                          locks,
 334                                          &async);
 335         }
 336         if (!NT_STATUS_IS_OK(status)) {
 337                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_LOCK_CONFLICT)) {
 338                        status = NT_STATUS_LOCK_NOT_GRANTED;
 339                 }
 340                 tevent_req_nterror(req, status);
 341                 return tevent_req_post(req, ev);
 342         }
 343
 344         if (async) {
 345                 return req;
 346         }
 347
 348         tevent_req_done(req);
 349         return tevent_req_post(req, ev);
 350 }
 351
 352 static NTSTATUS smbd_smb2_lock_recv(struct tevent_req *req)
 353 {
 354         NTSTATUS status;
 355
 356         if (tevent_req_is_nterror(req, &status)) {
 357                 tevent_req_received(req);
 358                 return status;
 359         }
 360
 361         tevent_req_received(req);
 362         return NT_STATUS_OK;
 363 }
 364
 365 /****************************************************************
 366  Cancel an outstanding blocking lock request.
 367 *****************************************************************/
 368
 369 static bool smbd_smb2_lock_cancel(struct tevent_req *req)
 370 {
 371         struct smbd_smb2_request *smb2req = NULL;
 372         struct smbd_smb2_lock_state *state = tevent_req_data(req,
 373                                 struct smbd_smb2_lock_state);
 374         if (!state) {
 375                 return false;
 376         }
 377
 378         if (!state->smb2req) {
 379                 return false;
 380         }
 381
 382         smb2req = state->smb2req;
 383
 384         remove_pending_lock(state, state->blr);
 385         tevent_req_defer_callback(req, smb2req->sconn->ev_ctx);
 386
 387         /*
 388          * If the request is canceled because of logoff, tdis or close
 389          * the status is NT_STATUS_RANGE_NOT_LOCKED instead of
 390          * NT_STATUS_CANCELLED.
 391          *
 392          * Note that the close case is handled in
 393          * cancel_pending_lock_requests_by_fid_smb2(SHUTDOWN_CLOSE)
 394          * for now.
 395          */
 396         if (!NT_STATUS_IS_OK(smb2req->session->status)) {
 397                 tevent_req_nterror(req, NT_STATUS_RANGE_NOT_LOCKED);
 398                 return true;
 399         }
 400
 401         if (!NT_STATUS_IS_OK(smb2req->tcon->status)) {
 402                 tevent_req_nterror(req, NT_STATUS_RANGE_NOT_LOCKED);
 403                 return true;
 404         }
 405
 406         tevent_req_nterror(req, NT_STATUS_CANCELLED);
 407         return true;
 408 }
 409
 410 /****************************************************************
 411  Got a message saying someone unlocked a file. Re-schedule all
 412  blocking lock requests as we don't know if anything overlapped.
 413 *****************************************************************/
 414
 415 static void received_unlock_msg(struct messaging_context *msg,
 416                                 void *private_data,
 417                                 uint32_t msg_type,
 418                                 struct server_id server_id,
 419                                 DATA_BLOB *data)
 420 {
 421         struct smbd_server_connection *sconn =
 422                 talloc_get_type_abort(private_data,
 423                 struct smbd_server_connection);
 424
 425         DEBUG(10,("received_unlock_msg (SMB2)\n"));
 426
 427         process_blocking_lock_queue_smb2(sconn, timeval_current());
 428 }
 429
 430 /****************************************************************
 431  Function to get the blr on a pending record.
 432 *****************************************************************/
 433
 434 struct blocking_lock_record *get_pending_smb2req_blr(struct smbd_smb2_request *smb2req)
 435 {
 436         struct smbd_smb2_lock_state *state = NULL;
 437         const uint8_t *inhdr;
 438
 439         if (!smb2req) {
 440                 return NULL;
 441         }
 442         if (smb2req->subreq == NULL) {
 443                 return NULL;
 444         }
 445         if (!tevent_req_is_in_progress(smb2req->subreq)) {
 446                 return NULL;
 447         }
 448         inhdr = SMBD_SMB2_IN_HDR_PTR(smb2req);
 449         if (SVAL(inhdr, SMB2_HDR_OPCODE) != SMB2_OP_LOCK) {
 450                 return NULL;
 451         }
 452         state = tevent_req_data(smb2req->subreq,
 453                         struct smbd_smb2_lock_state);
 454         if (!state) {
 455                 return NULL;
 456         }
 457         return state->blr;
 458 }
 459 /****************************************************************
 460  Set up the next brl timeout.
 461 *****************************************************************/
 462
 463 static bool recalc_smb2_brl_timeout(struct smbd_server_connection *sconn)
 464 {
 465         struct smbd_smb2_request *smb2req;
 466         struct timeval next_timeout = timeval_zero();
 467         int max_brl_timeout = lp_parm_int(-1, "brl", "recalctime", 5);
 468
 469         TALLOC_FREE(sconn->smb2.locks.brl_timeout);
 470
 471         for (smb2req = sconn->smb2.requests; smb2req; smb2req = smb2req->next) {
 472                 struct blocking_lock_record *blr =
 473                         get_pending_smb2req_blr(smb2req);
 474                 if (!blr) {
 475                         continue;
 476                 }
 477                 if (timeval_is_zero(&blr->expire_time)) {
 478                         /*
 479                          * If we're blocked on pid 0xFFFFFFFFFFFFFFFFLL this is
 480                          * a POSIX lock, so calculate a timeout of
 481                          * 10 seconds into the future.
 482                          */
 483                         if (blr->blocking_smblctx == 0xFFFFFFFFFFFFFFFFLL) {
 484                                 struct timeval psx_to = timeval_current_ofs(10, 0);
 485                                 next_timeout = timeval_brl_min(&next_timeout, &psx_to);
 486                         }
 487
 488                         continue;
 489                 }
 490
 491                 next_timeout = timeval_brl_min(&next_timeout, &blr->expire_time);
 492         }
 493
 494         if (timeval_is_zero(&next_timeout)) {
 495                 DEBUG(10, ("recalc_smb2_brl_timeout:Next "
 496                         "timeout = Infinite.\n"));
 497                 return true;
 498         }
 499
 500         /*
 501          * To account for unclean shutdowns by clients we need a
 502          * maximum timeout that we use for checking pending locks. If
 503          * we have any pending locks at all, then check if the pending
 504          * lock can continue at least every brl:recalctime seconds
 505          * (default 5 seconds).
 506          *
 507          * This saves us needing to do a message_send_all() in the
 508          * SIGCHLD handler in the parent daemon. That
 509          * message_send_all() caused O(n^2) work to be done when IP
 510          * failovers happened in clustered Samba, which could make the
 511          * entire system unusable for many minutes.
 512          */
 513
 514         if (max_brl_timeout > 0) {
 515                 struct timeval min_to = timeval_current_ofs(max_brl_timeout, 0);
 516                 next_timeout = timeval_brl_min(&next_timeout, &min_to);
 517         }
 518
 519         if (DEBUGLVL(10)) {
 520                 struct timeval cur, from_now;
 521
 522                 cur = timeval_current();
 523                 from_now = timeval_until(&cur, &next_timeout);
 524                 DEBUG(10, ("recalc_smb2_brl_timeout: Next "
 525                         "timeout = %d.%d seconds from now.\n",
 526                         (int)from_now.tv_sec, (int)from_now.tv_usec));
 527         }
 528
 529         sconn->smb2.locks.brl_timeout = tevent_add_timer(
 530                                 sconn->ev_ctx,
 531                                 NULL,
 532                                 next_timeout,
 533                                 brl_timeout_fn,
 534                                 sconn);
 535         if (!sconn->smb2.locks.brl_timeout) {
 536                 return false;
 537         }
 538         return true;
 539 }
 540
 541 /****************************************************************
 542  Get an SMB2 lock reqeust to go async. lock_timeout should
 543  always be -1 here.
 544 *****************************************************************/
 545
 546 bool push_blocking_lock_request_smb2( struct byte_range_lock *br_lck,
 547                                 struct smb_request *smb1req,
 548                                 files_struct *fsp,
 549                                 int lock_timeout,
 550                                 int lock_num,
 551                                 uint64_t smblctx,
 552                                 enum brl_type lock_type,
 553                                 enum brl_flavour lock_flav,
 554                                 uint64_t offset,
 555                                 uint64_t count,
 556                                 uint64_t blocking_smblctx)
 557 {
 558         struct smbd_server_connection *sconn = smb1req->sconn;
 559         struct smbd_smb2_request *smb2req = smb1req->smb2req;
 560         struct tevent_req *req = NULL;
 561         struct smbd_smb2_lock_state *state = NULL;
 562         struct blocking_lock_record *blr = NULL;
 563         NTSTATUS status = NT_STATUS_OK;
 564
 565         if (!smb2req) {
 566                 return false;
 567         }
 568         req = smb2req->subreq;
 569         if (!req) {
 570                 return false;
 571         }
 572         if (!tevent_req_is_in_progress(smb2req->subreq)) {
 573                 return false;
 574         }
 575         state = tevent_req_data(req, struct smbd_smb2_lock_state);
 576         if (!state) {
 577                 return false;
 578         }
 579
 580         blr = talloc_zero(state, struct blocking_lock_record);
 581         if (!blr) {
 582                 return false;
 583         }
 584         blr->fsp = fsp;
 585
 586         if (lock_timeout == -1) {
 587                 blr->expire_time.tv_sec = 0;
 588                 blr->expire_time.tv_usec = 0; /* Never expire. */
 589         } else {
 590                 blr->expire_time = timeval_current_ofs_msec(lock_timeout);
 591         }
 592
 593         blr->lock_num = lock_num;
 594         blr->smblctx = smblctx;
 595         blr->blocking_smblctx = blocking_smblctx;
 596         blr->lock_flav = lock_flav;
 597         blr->lock_type = lock_type;
 598         blr->offset = offset;
 599         blr->count = count;
 600
 601         /* Specific brl_lock() implementations can fill this in. */
 602         blr->blr_private = NULL;
 603
 604         /* Add a pending lock record for this. */
 605         status = brl_lock(sconn->msg_ctx,
 606                         br_lck,
 607                         smblctx,
 608                         messaging_server_id(sconn->msg_ctx),
 609                         offset,
 610                         count,
 611                         lock_type == READ_LOCK ? PENDING_READ_LOCK : PENDING_WRITE_LOCK,
 612                         blr->lock_flav,
 613                         true,
 614                         NULL,
 615                         blr);
 616
 617         if (!NT_STATUS_IS_OK(status)) {
 618                 DEBUG(0,("push_blocking_lock_request_smb2: "
 619                         "failed to add PENDING_LOCK record.\n"));
 620                 TALLOC_FREE(blr);
 621                 return false;
 622         }
 623         state->blr = blr;
 624
 625         DEBUG(10,("push_blocking_lock_request_smb2: file %s timeout %d\n",
 626                 fsp_str_dbg(fsp),
 627                 lock_timeout ));
 628
 629         recalc_smb2_brl_timeout(sconn);
 630
 631         /* Ensure we'll receive messages when this is unlocked. */
 632         if (!sconn->smb2.locks.blocking_lock_unlock_state) {
 633                 messaging_register(sconn->msg_ctx, sconn,
 634                                 MSG_SMB_UNLOCK, received_unlock_msg);
 635                 sconn->smb2.locks.blocking_lock_unlock_state = true;
 636         }
 637
 638         /* allow this request to be canceled */
 639         tevent_req_set_cancel_fn(req, smbd_smb2_lock_cancel);
 640
 641         return true;
 642 }
 643
 644 /****************************************************************
 645  Remove a pending lock record under lock.
 646 *****************************************************************/
 647
 648 static void remove_pending_lock(struct smbd_smb2_lock_state *state,
 649                         struct blocking_lock_record *blr)
 650 {
 651         int i;
 652         struct byte_range_lock *br_lck = brl_get_locks(
 653                                 state, blr->fsp);
 654
 655         DEBUG(10, ("remove_pending_lock: BLR = %p\n", blr));
 656
 657         if (br_lck) {
 658                 brl_lock_cancel(br_lck,
 659                                 blr->smblctx,
 660                                 messaging_server_id(blr->fsp->conn->sconn->msg_ctx),
 661                                 blr->offset,
 662                                 blr->count,
 663                                 blr->lock_flav,
 664                                 blr);
 665                 TALLOC_FREE(br_lck);
 666         }
 667 }
 668
 669 /****************************************************************
 670  Re-proccess a blocking lock request.
 671  This is equivalent to process_lockingX() inside smbd/blocking.c
 672 *****************************************************************/
 673
 674 static void reprocess_blocked_smb2_lock(struct smbd_smb2_request *smb2req,
 675                                 struct timeval tv_curr)
 676 {
 677         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 678         struct blocking_lock_record *blr = NULL;
 679         struct smbd_smb2_lock_state *state = NULL;
 680         struct byte_range_lock *br_lck = NULL;
 681         struct smbd_lock_element *e = NULL;
 682         files_struct *fsp = NULL;
 683
 684         if (!smb2req->subreq) {
 685                 return;
 686         }
 687         state = tevent_req_data(smb2req->subreq, struct smbd_smb2_lock_state);
 688         if (!state) {
 689                 return;
 690         }
 691
 692         blr = state->blr;
 693         fsp = blr->fsp;
 694
 695         /* We can only have one blocked lock in SMB2. */
 696         SMB_ASSERT(state->lock_count == 1);
 697         SMB_ASSERT(blr->lock_num == 0);
 698
 699         /* Try and get the outstanding lock. */
 700         e = &state->locks[blr->lock_num];
 701
 702         br_lck = do_lock(fsp->conn->sconn->msg_ctx,
 703                         fsp,
 704                         e->smblctx,
 705                         e->count,
 706                         e->offset,
 707                         e->brltype,
 708                         WINDOWS_LOCK,
 709                         true,
 710                         &status,
 711                         &blr->blocking_smblctx,
 712                         blr);
 713
 714         TALLOC_FREE(br_lck);
 715
 716         if (NT_STATUS_IS_OK(status)) {
 717                 /*
 718                  * Success - we got the lock.
 719                  */
 720
 721                 DEBUG(3,("reprocess_blocked_smb2_lock SUCCESS file = %s, "
 722                         "%s, num_locks=%d\n",
 723                         fsp_str_dbg(fsp),
 724                         fsp_fnum_dbg(fsp),
 725                         (int)state->lock_count));
 726
 727                 remove_pending_lock(state, blr);
 728                 tevent_req_done(smb2req->subreq);
 729                 return;
 730         }
 731
 732         if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
 733                         !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
 734                 /*
 735                  * We have other than a "can't get lock"
 736                  * error. Return an error.
 737                  */
 738                 remove_pending_lock(state, blr);
 739                 tevent_req_nterror(smb2req->subreq, status);
 740                 return;
 741         }
 742
 743         /*
 744          * We couldn't get the lock for this record.
 745          * If the time has expired, return a lock error.
 746          */
 747
 748         if (!timeval_is_zero(&blr->expire_time) &&
 749                         timeval_compare(&blr->expire_time, &tv_curr) <= 0) {
 750                 remove_pending_lock(state, blr);
 751                 tevent_req_nterror(smb2req->subreq, NT_STATUS_LOCK_NOT_GRANTED);
 752                 return;
 753         }
 754
 755         /*
 756          * Still can't get the lock - keep waiting.
 757          */
 758
 759         DEBUG(10,("reprocess_blocked_smb2_lock: failed to get lock "
 760                 "for file %s, %s. Still waiting....\n",
 761                 fsp_str_dbg(fsp),
 762                 fsp_fnum_dbg(fsp)));
 763
 764         return;
 765 }
 766
 767 /****************************************************************
 768  Attempt to proccess all outstanding blocking locks pending on
 769  the request queue.
 770 *****************************************************************/
 771
 772 void process_blocking_lock_queue_smb2(
 773         struct smbd_server_connection *sconn, struct timeval tv_curr)
 774 {
 775         struct smbd_smb2_request *smb2req, *nextreq;
 776
 777         for (smb2req = sconn->smb2.requests; smb2req; smb2req = nextreq) {
 778                 const uint8_t *inhdr;
 779
 780                 nextreq = smb2req->next;
 781
 782                 if (smb2req->subreq == NULL) {
 783                         /* This message has been processed. */
 784                         continue;
 785                 }
 786                 if (!tevent_req_is_in_progress(smb2req->subreq)) {
 787                         /* This message has been processed. */
 788                         continue;
 789                 }
 790
 791                 inhdr = SMBD_SMB2_IN_HDR_PTR(smb2req);
 792                 if (SVAL(inhdr, SMB2_HDR_OPCODE) == SMB2_OP_LOCK) {
 793                         reprocess_blocked_smb2_lock(smb2req, tv_curr);
 794                 }
 795         }
 796
 797         recalc_smb2_brl_timeout(sconn);
 798 }
 799
 800 /****************************************************************************
 801  Remove any locks on this fd. Called from file_close().
 802 ****************************************************************************/
 803
 804 void cancel_pending_lock_requests_by_fid_smb2(files_struct *fsp,
 805                         struct byte_range_lock *br_lck,
 806                         enum file_close_type close_type)
 807 {
 808         struct smbd_server_connection *sconn = fsp->conn->sconn;
 809         struct smbd_smb2_request *smb2req, *nextreq;
 810
 811         for (smb2req = sconn->smb2.requests; smb2req; smb2req = nextreq) {
 812                 struct smbd_smb2_lock_state *state = NULL;
 813                 files_struct *fsp_curr = NULL;
 814                 struct blocking_lock_record *blr = NULL;
 815                 const uint8_t *inhdr;
 816
 817                 nextreq = smb2req->next;
 818
 819                 if (smb2req->subreq == NULL) {
 820                         /* This message has been processed. */
 821                         continue;
 822                 }
 823                 if (!tevent_req_is_in_progress(smb2req->subreq)) {
 824                         /* This message has been processed. */
 825                         continue;
 826                 }
 827
 828                 inhdr = SMBD_SMB2_IN_HDR_PTR(smb2req);
 829                 if (SVAL(inhdr, SMB2_HDR_OPCODE) != SMB2_OP_LOCK) {
 830                         /* Not a lock call. */
 831                         continue;
 832                 }
 833
 834                 state = tevent_req_data(smb2req->subreq,
 835                                 struct smbd_smb2_lock_state);
 836                 if (!state) {
 837                         /* Strange - is this even possible ? */
 838                         continue;
 839                 }
 840
 841                 fsp_curr = smb2req->compat_chain_fsp;
 842                 if (fsp_curr == NULL) {
 843                         /* Strange - is this even possible ? */
 844                         continue;
 845                 }
 846
 847                 if (fsp_curr != fsp) {
 848                         /* It's not our fid */
 849                         continue;
 850                 }
 851
 852                 blr = state->blr;
 853
 854                 /* Remove the entries from the lock db. */
 855                 brl_lock_cancel(br_lck,
 856                                 blr->smblctx,
 857                                 messaging_server_id(sconn->msg_ctx),
 858                                 blr->offset,
 859                                 blr->count,
 860                                 blr->lock_flav,
 861                                 blr);
 862
 863                 /* Finally end the request. */
 864                 if (close_type == SHUTDOWN_CLOSE) {
 865                         tevent_req_done(smb2req->subreq);
 866                 } else {
 867                         tevent_req_nterror(smb2req->subreq,
 868                                 NT_STATUS_RANGE_NOT_LOCKED);
 869                 }
 870         }
 871 }