source3/smbd/smb2_lock.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   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 "smbd/globals.h"
  23 #include "../libcli/smb/smb_common.h"
  24 #include "librpc/gen_ndr/messaging.h"
  25
  26 struct smbd_smb2_lock_element {
  27         uint64_t offset;
  28         uint64_t length;
  29         uint32_t flags;
  30 };
  31
  32 static struct tevent_req *smbd_smb2_lock_send(TALLOC_CTX *mem_ctx,
  33                                                  struct tevent_context *ev,
  34                                                  struct smbd_smb2_request *smb2req,
  35                                                  uint32_t in_smbpid,
  36                                                  uint64_t in_file_id_volatile,
  37                                                  uint16_t in_lock_count,
  38                                                  struct smbd_smb2_lock_element *in_locks);
  39 static NTSTATUS smbd_smb2_lock_recv(struct tevent_req *req);
  40
  41 static void smbd_smb2_request_lock_done(struct tevent_req *subreq);
  42 NTSTATUS smbd_smb2_request_process_lock(struct smbd_smb2_request *req)
  43 {
  44         const uint8_t *inhdr;
  45         const uint8_t *inbody;
  46         const int i = req->current_idx;
  47         size_t expected_body_size = 0x30;
  48         size_t body_size;
  49         uint32_t in_smbpid;
  50         uint16_t in_lock_count;
  51         uint64_t in_file_id_persistent;
  52         uint64_t in_file_id_volatile;
  53         struct smbd_smb2_lock_element *in_locks;
  54         struct tevent_req *subreq;
  55         const uint8_t *lock_buffer;
  56         uint16_t l;
  57
  58         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  59         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  60                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  61         }
  62
  63         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  64
  65         body_size = SVAL(inbody, 0x00);
  66         if (body_size != expected_body_size) {
  67                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  68         }
  69
  70         in_smbpid                       = IVAL(inhdr, SMB2_HDR_PID);
  71
  72         in_lock_count                   = CVAL(inbody, 0x02);
  73         /* 0x04 - 4 bytes reserved */
  74         in_file_id_persistent           = BVAL(inbody, 0x08);
  75         in_file_id_volatile             = BVAL(inbody, 0x10);
  76
  77         if (in_lock_count < 1) {
  78                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  79         }
  80
  81         if (((in_lock_count - 1) * 0x18) > req->in.vector[i+2].iov_len) {
  82                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  83         }
  84
  85         if (req->compat_chain_fsp) {
  86                 /* skip check */
  87         } else if (in_file_id_persistent != 0) {
  88                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  89         }
  90
  91         in_locks = talloc_array(req, struct smbd_smb2_lock_element,
  92                                 in_lock_count);
  93         if (in_locks == NULL) {
  94                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  95         }
  96
  97         l = 0;
  98         lock_buffer = inbody + 0x18;
  99
 100         in_locks[l].offset      = BVAL(lock_buffer, 0x00);
 101         in_locks[l].length      = BVAL(lock_buffer, 0x08);
 102         in_locks[l].flags       = IVAL(lock_buffer, 0x10);
 103         /* 0x14 - 4 reserved bytes */
 104
 105         lock_buffer = (const uint8_t *)req->in.vector[i+2].iov_base;
 106
 107         for (l=1; l < in_lock_count; l++) {
 108                 in_locks[l].offset      = BVAL(lock_buffer, 0x00);
 109                 in_locks[l].length      = BVAL(lock_buffer, 0x08);
 110                 in_locks[l].flags       = IVAL(lock_buffer, 0x10);
 111                 /* 0x14 - 4 reserved bytes */
 112
 113                 lock_buffer += 0x18;
 114         }
 115
 116         subreq = smbd_smb2_lock_send(req,
 117                                      req->sconn->smb2.event_ctx,
 118                                      req,
 119                                      in_smbpid,
 120                                      in_file_id_volatile,
 121                                      in_lock_count,
 122                                      in_locks);
 123         if (subreq == NULL) {
 124                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 125         }
 126         tevent_req_set_callback(subreq, smbd_smb2_request_lock_done, req);
 127
 128         return smbd_smb2_request_pending_queue(req, subreq);
 129 }
 130
 131 static void smbd_smb2_request_lock_done(struct tevent_req *subreq)
 132 {
 133         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 134                                         struct smbd_smb2_request);
 135         DATA_BLOB outbody;
 136         NTSTATUS status;
 137         NTSTATUS error; /* transport error */
 138
 139         if (req->cancelled) {
 140                 const uint8_t *inhdr = (const uint8_t *)
 141                         req->in.vector[req->current_idx].iov_base;
 142                 uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
 143
 144                 DEBUG(10,("smbd_smb2_request_lock_done: cancelled mid %llu\n",
 145                         (unsigned long long)mid ));
 146                 error = smbd_smb2_request_error(req, NT_STATUS_CANCELLED);
 147                 if (!NT_STATUS_IS_OK(error)) {
 148                         smbd_server_connection_terminate(req->sconn,
 149                                 nt_errstr(error));
 150                         return;
 151                 }
 152                 return;
 153         }
 154
 155         status = smbd_smb2_lock_recv(subreq);
 156         TALLOC_FREE(subreq);
 157         if (!NT_STATUS_IS_OK(status)) {
 158                 error = smbd_smb2_request_error(req, status);
 159                 if (!NT_STATUS_IS_OK(error)) {
 160                         smbd_server_connection_terminate(req->sconn,
 161                                                          nt_errstr(error));
 162                         return;
 163                 }
 164                 return;
 165         }
 166
 167         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 168         if (outbody.data == NULL) {
 169                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 170                 if (!NT_STATUS_IS_OK(error)) {
 171                         smbd_server_connection_terminate(req->sconn,
 172                                                          nt_errstr(error));
 173                         return;
 174                 }
 175                 return;
 176         }
 177
 178         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 179         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 180
 181         error = smbd_smb2_request_done(req, outbody, NULL);
 182         if (!NT_STATUS_IS_OK(error)) {
 183                 smbd_server_connection_terminate(req->sconn,
 184                                                  nt_errstr(error));
 185                 return;
 186         }
 187 }
 188
 189 struct smbd_smb2_lock_state {
 190         struct smbd_smb2_request *smb2req;
 191         struct smb_request *smb1req;
 192         struct blocking_lock_record *blr;
 193         uint16_t lock_count;
 194         struct smbd_lock_element *locks;
 195 };
 196
 197 static struct tevent_req *smbd_smb2_lock_send(TALLOC_CTX *mem_ctx,
 198                                                  struct tevent_context *ev,
 199                                                  struct smbd_smb2_request *smb2req,
 200                                                  uint32_t in_smbpid,
 201                                                  uint64_t in_file_id_volatile,
 202                                                  uint16_t in_lock_count,
 203                                                  struct smbd_smb2_lock_element *in_locks)
 204 {
 205         struct tevent_req *req;
 206         struct smbd_smb2_lock_state *state;
 207         struct smb_request *smb1req;
 208         connection_struct *conn = smb2req->tcon->compat_conn;
 209         files_struct *fsp;
 210         int32_t timeout = -1;
 211         bool isunlock = false;
 212         uint16_t i;
 213         struct smbd_lock_element *locks;
 214         NTSTATUS status;
 215         bool async = false;
 216
 217         req = tevent_req_create(mem_ctx, &state,
 218                         struct smbd_smb2_lock_state);
 219         if (req == NULL) {
 220                 return NULL;
 221         }
 222         state->smb2req = smb2req;
 223         smb1req = smbd_smb2_fake_smb_request(smb2req);
 224         if (tevent_req_nomem(smb1req, req)) {
 225                 return tevent_req_post(req, ev);
 226         }
 227         state->smb1req = smb1req;
 228
 229         DEBUG(10,("smbd_smb2_lock_send: file_id[0x%016llX]\n",
 230                   (unsigned long long)in_file_id_volatile));
 231
 232         fsp = file_fsp(smb1req, (uint16_t)in_file_id_volatile);
 233         if (fsp == NULL) {
 234                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 235                 return tevent_req_post(req, ev);
 236         }
 237         if (conn != fsp->conn) {
 238                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 239                 return tevent_req_post(req, ev);
 240         }
 241         if (smb2req->session->vuid != fsp->vuid) {
 242                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 243                 return tevent_req_post(req, ev);
 244         }
 245
 246         locks = talloc_array(state, struct smbd_lock_element, in_lock_count);
 247         if (locks == NULL) {
 248                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 249                 return tevent_req_post(req, ev);
 250         }
 251
 252         switch (in_locks[0].flags) {
 253         case SMB2_LOCK_FLAG_SHARED:
 254         case SMB2_LOCK_FLAG_EXCLUSIVE:
 255                 if (in_lock_count > 1) {
 256                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 257                         return tevent_req_post(req, ev);
 258                 }
 259                 timeout = -1;
 260                 break;
 261
 262         case SMB2_LOCK_FLAG_SHARED|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 263         case SMB2_LOCK_FLAG_EXCLUSIVE|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 264                 timeout = 0;
 265                 break;
 266
 267         case SMB2_LOCK_FLAG_UNLOCK:
 268                 /* only the first lock gives the UNLOCK bit - see
 269                    MS-SMB2 3.3.5.14 */
 270                 isunlock = true;
 271                 timeout = 0;
 272                 break;
 273
 274         default:
 275                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 276                 return tevent_req_post(req, ev);
 277         }
 278
 279         for (i=0; i<in_lock_count; i++) {
 280                 bool invalid = false;
 281
 282                 switch (in_locks[i].flags) {
 283                 case SMB2_LOCK_FLAG_SHARED:
 284                 case SMB2_LOCK_FLAG_EXCLUSIVE:
 285                         if (i > 0) {
 286                                 tevent_req_nterror(req,
 287                                                    NT_STATUS_INVALID_PARAMETER);
 288                                 return tevent_req_post(req, ev);
 289                         }
 290                         if (isunlock) {
 291                                 tevent_req_nterror(req,
 292                                                    NT_STATUS_INVALID_PARAMETER);
 293                                 return tevent_req_post(req, ev);
 294                         }
 295                         break;
 296
 297                 case SMB2_LOCK_FLAG_SHARED|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 298                 case SMB2_LOCK_FLAG_EXCLUSIVE|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 299                         if (isunlock) {
 300                                 tevent_req_nterror(req,
 301                                                    NT_STATUS_INVALID_PARAMETER);
 302                                 return tevent_req_post(req, ev);
 303                         }
 304                         break;
 305
 306                 case SMB2_LOCK_FLAG_UNLOCK:
 307                         if (!isunlock) {
 308                                 tevent_req_nterror(req,
 309                                                    NT_STATUS_INVALID_PARAMETER);
 310                                 return tevent_req_post(req, ev);
 311                         }
 312                         break;
 313
 314                 default:
 315                         if (isunlock) {
 316                                 /*
 317                                  * is the first element was a UNLOCK
 318                                  * we need to deferr the error response
 319                                  * to the backend, because we need to process
 320                                  * all unlock elements before
 321                                  */
 322                                 invalid = true;
 323                                 break;
 324                         }
 325                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 326                         return tevent_req_post(req, ev);
 327                 }
 328
 329                 locks[i].smbpid = in_smbpid;
 330                 locks[i].offset = in_locks[i].offset;
 331                 locks[i].count  = in_locks[i].length;
 332
 333                 if (in_locks[i].flags & SMB2_LOCK_FLAG_EXCLUSIVE) {
 334                         locks[i].brltype = WRITE_LOCK;
 335                 } else if (in_locks[i].flags & SMB2_LOCK_FLAG_SHARED) {
 336                         locks[i].brltype = READ_LOCK;
 337                 } else if (invalid) {
 338                         /*
 339                          * this is an invalid UNLOCK element
 340                          * and the backend needs to test for
 341                          * brltype != UNLOCK_LOCK and return
 342                          * NT_STATUS_INVALID_PARAMER
 343                          */
 344                         locks[i].brltype = READ_LOCK;
 345                 } else {
 346                         locks[i].brltype = UNLOCK_LOCK;
 347                 }
 348         }
 349
 350         state->locks = locks;
 351         state->lock_count = in_lock_count;
 352
 353         if (isunlock) {
 354                 status = smbd_do_locking(smb1req, fsp,
 355                                          0,
 356                                          timeout,
 357                                          in_lock_count,
 358                                          locks,
 359                                          0,
 360                                          NULL,
 361                                          &async);
 362         } else {
 363                 status = smbd_do_locking(smb1req, fsp,
 364                                          0,
 365                                          timeout,
 366                                          0,
 367                                          NULL,
 368                                          in_lock_count,
 369                                          locks,
 370                                          &async);
 371         }
 372         if (!NT_STATUS_IS_OK(status)) {
 373                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_LOCK_CONFLICT)) {
 374                        status = NT_STATUS_LOCK_NOT_GRANTED;
 375                 }
 376                 tevent_req_nterror(req, status);
 377                 return tevent_req_post(req, ev);
 378         }
 379
 380         if (async) {
 381                 return req;
 382         }
 383
 384         tevent_req_done(req);
 385         return tevent_req_post(req, ev);
 386 }
 387
 388 static NTSTATUS smbd_smb2_lock_recv(struct tevent_req *req)
 389 {
 390         NTSTATUS status;
 391
 392         if (tevent_req_is_nterror(req, &status)) {
 393                 tevent_req_received(req);
 394                 return status;
 395         }
 396
 397         tevent_req_received(req);
 398         return NT_STATUS_OK;
 399 }
 400
 401 /****************************************************************
 402  Cancel an outstanding blocking lock request.
 403 *****************************************************************/
 404
 405 static bool smbd_smb2_lock_cancel(struct tevent_req *req)
 406 {
 407         struct smbd_smb2_request *smb2req = NULL;
 408         struct smbd_smb2_lock_state *state = tevent_req_data(req,
 409                                 struct smbd_smb2_lock_state);
 410         if (!state) {
 411                 return false;
 412         }
 413
 414         if (!state->smb2req) {
 415                 return false;
 416         }
 417
 418         smb2req = state->smb2req;
 419         smb2req->cancelled = true;
 420
 421         tevent_req_done(req);
 422         return true;
 423 }
 424
 425 /****************************************************************
 426  Got a message saying someone unlocked a file. Re-schedule all
 427  blocking lock requests as we don't know if anything overlapped.
 428 *****************************************************************/
 429
 430 static void received_unlock_msg(struct messaging_context *msg,
 431                                 void *private_data,
 432                                 uint32_t msg_type,
 433                                 struct server_id server_id,
 434                                 DATA_BLOB *data)
 435 {
 436         DEBUG(10,("received_unlock_msg (SMB2)\n"));
 437         process_blocking_lock_queue_smb2();
 438 }
 439
 440 /****************************************************************
 441  Function to get the blr on a pending record.
 442 *****************************************************************/
 443
 444 struct blocking_lock_record *get_pending_smb2req_blr(struct smbd_smb2_request *smb2req)
 445 {
 446         struct smbd_smb2_lock_state *state = NULL;
 447         const uint8_t *inhdr;
 448
 449         if (!smb2req) {
 450                 return NULL;
 451         }
 452         if (smb2req->subreq == NULL) {
 453                 return NULL;
 454         }
 455         if (!tevent_req_is_in_progress(smb2req->subreq)) {
 456                 return NULL;
 457         }
 458         inhdr = (const uint8_t *)smb2req->in.vector[smb2req->current_idx].iov_base;
 459         if (IVAL(inhdr, SMB2_HDR_OPCODE) != SMB2_OP_LOCK) {
 460                 return NULL;
 461         }
 462         state = tevent_req_data(smb2req->subreq,
 463                         struct smbd_smb2_lock_state);
 464         if (!state) {
 465                 return NULL;
 466         }
 467         return state->blr;
 468 }
 469 /****************************************************************
 470  Set up the next brl timeout.
 471 *****************************************************************/
 472
 473 static bool recalc_smb2_brl_timeout(struct smbd_server_connection *sconn)
 474 {
 475         struct smbd_smb2_request *smb2req;
 476         struct timeval next_timeout;
 477         int max_brl_timeout = lp_parm_int(-1, "brl", "recalctime", 5);
 478
 479         TALLOC_FREE(sconn->smb2.locks.brl_timeout);
 480
 481         next_timeout = timeval_zero();
 482
 483         for (smb2req = sconn->smb2.requests; smb2req; smb2req = smb2req->next) {
 484                 struct blocking_lock_record *blr =
 485                         get_pending_smb2req_blr(smb2req);
 486                 if (!blr) {
 487                         continue;
 488                 }
 489                 if (timeval_is_zero(&blr->expire_time)) {
 490                         /*
 491                          * If we're blocked on pid 0xFFFFFFFF this is
 492                          * a POSIX lock, so calculate a timeout of
 493                          * 10 seconds into the future.
 494                          */
 495                         if (blr->blocking_pid == 0xFFFFFFFF) {
 496                                 struct timeval psx_to = timeval_current_ofs(10, 0);
 497                                 next_timeout = timeval_brl_min(&next_timeout, &psx_to);
 498                         }
 499
 500                         continue;
 501                 }
 502
 503                 next_timeout = timeval_brl_min(&next_timeout, &blr->expire_time);
 504         }
 505
 506         if (timeval_is_zero(&next_timeout)) {
 507                 DEBUG(10, ("recalc_smb2_brl_timeout:Next "
 508                         "timeout = Infinite.\n"));
 509                 return True;
 510         }
 511
 512         /*
 513          * To account for unclean shutdowns by clients we need a
 514          * maximum timeout that we use for checking pending locks. If
 515          * we have any pending locks at all, then check if the pending
 516          * lock can continue at least every brl:recalctime seconds
 517          * (default 5 seconds).
 518          *
 519          * This saves us needing to do a message_send_all() in the
 520          * SIGCHLD handler in the parent daemon. That
 521          * message_send_all() caused O(n^2) work to be done when IP
 522          * failovers happened in clustered Samba, which could make the
 523          * entire system unusable for many minutes.
 524          */
 525
 526         if (max_brl_timeout > 0) {
 527                 struct timeval min_to = timeval_current_ofs(max_brl_timeout, 0);
 528                 next_timeout = timeval_brl_min(&next_timeout, &min_to);
 529         }
 530
 531         if (DEBUGLVL(10)) {
 532                 struct timeval cur, from_now;
 533
 534                 cur = timeval_current();
 535                 from_now = timeval_until(&cur, &next_timeout);
 536                 DEBUG(10, ("recalc_smb2_brl_timeout: Next "
 537                         "timeout = %d.%d seconds from now.\n",
 538                         (int)from_now.tv_sec, (int)from_now.tv_usec));
 539         }
 540
 541         sconn->smb2.locks.brl_timeout = event_add_timed(
 542                                 smbd_event_context(),
 543                                 NULL,
 544                                 next_timeout,
 545                                 brl_timeout_fn,
 546                                 NULL);
 547         if (!sconn->smb2.locks.brl_timeout) {
 548                 return false;
 549         }
 550         return true;
 551 }
 552
 553 /****************************************************************
 554  Get an SMB2 lock reqeust to go async. lock_timeout should
 555  always be -1 here.
 556 *****************************************************************/
 557
 558 bool push_blocking_lock_request_smb2( struct byte_range_lock *br_lck,
 559                                 struct smb_request *smb1req,
 560                                 files_struct *fsp,
 561                                 int lock_timeout,
 562                                 int lock_num,
 563                                 uint32_t lock_pid,
 564                                 enum brl_type lock_type,
 565                                 enum brl_flavour lock_flav,
 566                                 uint64_t offset,
 567                                 uint64_t count,
 568                                 uint32_t blocking_pid)
 569 {
 570         struct smbd_server_connection *sconn = smbd_server_conn;
 571         struct smbd_smb2_request *smb2req = smb1req->smb2req;
 572         struct tevent_req *req = NULL;
 573         struct smbd_smb2_lock_state *state = NULL;
 574         NTSTATUS status = NT_STATUS_OK;
 575
 576         if (!smb2req) {
 577                 return false;
 578         }
 579         req = smb2req->subreq;
 580         if (!req) {
 581                 return false;
 582         }
 583         state = tevent_req_data(req, struct smbd_smb2_lock_state);
 584         if (!state) {
 585                 return false;
 586         }
 587
 588         if (!state->blr) {
 589                 struct blocking_lock_record *blr = talloc_zero(state,
 590                                         struct blocking_lock_record);
 591                 if (!blr) {
 592                         return false;
 593                 }
 594                 blr = talloc_zero(state, struct blocking_lock_record);
 595                 blr->fsp = fsp;
 596                 if (lock_timeout == -1) {
 597                         blr->expire_time.tv_sec = 0;
 598                         blr->expire_time.tv_usec = 0; /* Never expire. */
 599                 } else {
 600                         blr->expire_time = timeval_current_ofs(
 601                                 lock_timeout/1000,
 602                                 (lock_timeout % 1000) * 1000);
 603                 }
 604
 605                 blr->lock_num = lock_num;
 606                 blr->lock_pid = lock_pid;
 607                 blr->blocking_pid = blocking_pid;
 608                 blr->lock_flav = lock_flav;
 609                 blr->lock_type = lock_type;
 610                 blr->offset = offset;
 611                 blr->count = count;
 612
 613                 /* Specific brl_lock() implementations can fill this in. */
 614                 blr->blr_private = NULL;
 615
 616                 /* Add a pending lock record for this. */
 617                 status = brl_lock(smbd_messaging_context(),
 618                         br_lck,
 619                         lock_pid,
 620                         procid_self(),
 621                         offset,
 622                         count,
 623                         lock_type == READ_LOCK ? PENDING_READ_LOCK : PENDING_WRITE_LOCK,
 624                         blr->lock_flav,
 625                         true,
 626                         NULL,
 627                         blr);
 628
 629                 if (!NT_STATUS_IS_OK(status)) {
 630                         DEBUG(0,("push_blocking_lock_request_smb2: "
 631                                 "failed to add PENDING_LOCK record.\n"));
 632                         TALLOC_FREE(blr);
 633                         return false;
 634                 }
 635                 state->blr = blr;
 636         }
 637
 638         recalc_smb2_brl_timeout(sconn);
 639
 640         /* Ensure we'll receive messages when this is unlocked. */
 641         if (!sconn->smb2.locks.blocking_lock_unlock_state) {
 642                 messaging_register(smbd_messaging_context(), NULL,
 643                                 MSG_SMB_UNLOCK, received_unlock_msg);
 644                 sconn->smb2.locks.blocking_lock_unlock_state = true;
 645         }
 646
 647         /* allow this request to be canceled */
 648         tevent_req_set_cancel_fn(req, smbd_smb2_lock_cancel);
 649
 650         return true;
 651 }
 652
 653 /****************************************************************
 654  Re-proccess a blocking lock request.
 655  This is equivalent to process_lockingX() inside smbd/blocking.c
 656 *****************************************************************/
 657
 658 static void reprocess_blocked_smb2_lock(struct smbd_smb2_request *smb2req)
 659 {
 660         NTSTATUS status;
 661         struct blocking_lock_record *blr = NULL;
 662         struct smbd_smb2_lock_state *state = NULL;
 663         files_struct *fsp = NULL;
 664
 665         if (!smb2req->subreq) {
 666                 return;
 667         }
 668         state = tevent_req_data(smb2req->subreq, struct smbd_smb2_lock_state);
 669         if (!state) {
 670                 return;
 671         }
 672
 673         blr = state->blr;
 674         fsp = blr->fsp;
 675
 676         /* Try and finish off getting all the outstanding locks. */
 677
 678         for (; blr->lock_num < state->lock_count; blr->lock_num++) {
 679                 struct byte_range_lock *br_lck = NULL;
 680                 struct smbd_lock_element *e = &state->locks[blr->lock_num];
 681
 682                 br_lck = do_lock(smbd_messaging_context(),
 683                                 fsp,
 684                                 e->smbpid,
 685                                 e->count,
 686                                 e->offset,
 687                                 e->brltype,
 688                                 WINDOWS_LOCK,
 689                                 true,
 690                                 &status,
 691                                 &blr->blocking_pid,
 692                                 blr);
 693
 694                 TALLOC_FREE(br_lck);
 695
 696                 if (NT_STATUS_IS_ERR(status)) {
 697                         break;
 698                 }
 699         }
 700
 701         if(blr->lock_num == state->lock_count) {
 702                 /*
 703                  * Success - we got all the locks.
 704                  */
 705
 706                 DEBUG(3,("reprocess_blocked_smb2_lock SUCCESS file = %s, "
 707                         "fnum=%d num_locks=%d\n",
 708                         fsp_str_dbg(fsp),
 709                         fsp->fnum,
 710                         (int)state->lock_count));
 711
 712                 tevent_req_done(smb2req->subreq);
 713                 return;
 714         }
 715
 716         if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
 717                         !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
 718                 /*
 719                  * We have other than a "can't get lock"
 720                  * error. Return an error.
 721                  */
 722                 tevent_req_nterror(smb2req->subreq, status);
 723                 return;
 724         }
 725
 726         /*
 727          * Still can't get all the locks - keep waiting.
 728          */
 729
 730         DEBUG(10,("reprocess_blocked_smb2_lock: only got %d locks of %d needed "
 731                 "for file %s, fnum = %d. Waiting....\n",
 732                 (int)blr->lock_num,
 733                 (int)state->lock_count,
 734                 fsp_str_dbg(fsp),
 735                 (int)fsp->fnum));
 736
 737         return;
 738
 739 }
 740
 741 /****************************************************************
 742  Attempt to proccess all outstanding blocking locks pending on
 743  the request queue.
 744 *****************************************************************/
 745
 746 void process_blocking_lock_queue_smb2(void)
 747 {
 748         struct smbd_server_connection *sconn = smbd_server_conn;
 749         struct smbd_smb2_request *smb2req, *nextreq;
 750
 751         for (smb2req = sconn->smb2.requests; smb2req; smb2req = nextreq) {
 752                 const uint8_t *inhdr;
 753
 754                 nextreq = smb2req->next;
 755
 756                 if (smb2req->subreq == NULL) {
 757                         /* This message has been processed. */
 758                         continue;
 759                 }
 760                 if (!tevent_req_is_in_progress(smb2req->subreq)) {
 761                         /* This message has been processed. */
 762                         continue;
 763                 }
 764
 765                 inhdr = (const uint8_t *)smb2req->in.vector[smb2req->current_idx].iov_base;
 766                 if (IVAL(inhdr, SMB2_HDR_OPCODE) == SMB2_OP_LOCK) {
 767                         reprocess_blocked_smb2_lock(smb2req);
 768                 }
 769         }
 770
 771         recalc_smb2_brl_timeout(sconn);
 772 }
 773
 774 /****************************************************************************
 775  Remove any locks on this fd. Called from file_close().
 776 ****************************************************************************/
 777
 778 void cancel_pending_lock_requests_by_fid_smb2(files_struct *fsp,
 779                         struct byte_range_lock *br_lck)
 780 {
 781         struct smbd_server_connection *sconn = smbd_server_conn;
 782         struct smbd_smb2_request *smb2req, *nextreq;
 783
 784         for (smb2req = sconn->smb2.requests; smb2req; smb2req = nextreq) {
 785                 struct smbd_smb2_lock_state *state = NULL;
 786                 files_struct *fsp_curr = NULL;
 787                 int i = smb2req->current_idx;
 788                 uint64_t in_file_id_volatile;
 789                 struct blocking_lock_record *blr = NULL;
 790                 const uint8_t *inhdr;
 791                 const uint8_t *inbody;
 792
 793                 nextreq = smb2req->next;
 794
 795                 if (smb2req->subreq == NULL) {
 796                         /* This message has been processed. */
 797                         continue;
 798                 }
 799                 if (!tevent_req_is_in_progress(smb2req->subreq)) {
 800                         /* This message has been processed. */
 801                         continue;
 802                 }
 803
 804                 inhdr = (const uint8_t *)smb2req->in.vector[i].iov_base;
 805                 if (IVAL(inhdr, SMB2_HDR_OPCODE) != SMB2_OP_LOCK) {
 806                         /* Not a lock call. */
 807                         continue;
 808                 }
 809
 810                 inbody = (const uint8_t *)smb2req->in.vector[i+1].iov_base;
 811                 in_file_id_volatile = BVAL(inbody, 0x10);
 812
 813                 state = tevent_req_data(smb2req->subreq,
 814                                 struct smbd_smb2_lock_state);
 815                 if (!state) {
 816                         /* Strange - is this even possible ? */
 817                         continue;
 818                 }
 819
 820                 fsp_curr = file_fsp(state->smb1req, (uint16_t)in_file_id_volatile);
 821                 if (fsp_curr == NULL) {
 822                         /* Strange - is this even possible ? */
 823                         continue;
 824                 }
 825
 826                 if (fsp_curr != fsp) {
 827                         /* It's not our fid */
 828                         continue;
 829                 }
 830
 831                 blr = state->blr;
 832
 833                 /* Remove the entries from the lock db. */
 834                 brl_lock_cancel(br_lck,
 835                                 blr->lock_pid,
 836                                 procid_self(),
 837                                 blr->offset,
 838                                 blr->count,
 839                                 blr->lock_flav,
 840                                 blr);
 841
 842                 /* Finally cancel the request. */
 843                 smb2req->cancelled = true;
 844                 tevent_req_cancel(smb2req->subreq);
 845         }
 846 }