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                                                  uint32_t in_smbpid,
  50                                                  uint64_t in_file_id_volatile,
  51                                                  uint16_t in_lock_count,
  52                                                  struct smbd_smb2_lock_element *in_locks);
  53 static NTSTATUS smbd_smb2_lock_recv(struct tevent_req *req);
  54
  55 static void smbd_smb2_request_lock_done(struct tevent_req *subreq);
  56 NTSTATUS smbd_smb2_request_process_lock(struct smbd_smb2_request *req)
  57 {
  58         const uint8_t *inhdr;
  59         const uint8_t *inbody;
  60         const int i = req->current_idx;
  61         size_t expected_body_size = 0x30;
  62         size_t body_size;
  63         uint32_t in_smbpid;
  64         uint16_t in_lock_count;
  65         uint64_t in_file_id_persistent;
  66         uint64_t in_file_id_volatile;
  67         struct smbd_smb2_lock_element *in_locks;
  68         struct tevent_req *subreq;
  69         const uint8_t *lock_buffer;
  70         uint16_t l;
  71
  72         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  73         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  74                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  75         }
  76
  77         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  78
  79         body_size = SVAL(inbody, 0x00);
  80         if (body_size != expected_body_size) {
  81                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  82         }
  83
  84         in_smbpid                       = IVAL(inhdr, SMB2_HDR_PID);
  85
  86         in_lock_count                   = CVAL(inbody, 0x02);
  87         /* 0x04 - 4 bytes reserved */
  88         in_file_id_persistent           = BVAL(inbody, 0x08);
  89         in_file_id_volatile             = BVAL(inbody, 0x10);
  90
  91         if (in_lock_count < 1) {
  92                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  93         }
  94
  95         if (((in_lock_count - 1) * 0x18) > req->in.vector[i+2].iov_len) {
  96                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  97         }
  98
  99         if (req->compat_chain_fsp) {
 100                 /* skip check */
 101         } else if (in_file_id_persistent != in_file_id_volatile) {
 102                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 103         }
 104
 105         in_locks = talloc_array(req, struct smbd_smb2_lock_element,
 106                                 in_lock_count);
 107         if (in_locks == NULL) {
 108                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 109         }
 110
 111         l = 0;
 112         lock_buffer = inbody + 0x18;
 113
 114         in_locks[l].offset      = BVAL(lock_buffer, 0x00);
 115         in_locks[l].length      = BVAL(lock_buffer, 0x08);
 116         in_locks[l].flags       = IVAL(lock_buffer, 0x10);
 117         /* 0x14 - 4 reserved bytes */
 118
 119         lock_buffer = (const uint8_t *)req->in.vector[i+2].iov_base;
 120
 121         for (l=1; l < in_lock_count; l++) {
 122                 in_locks[l].offset      = BVAL(lock_buffer, 0x00);
 123                 in_locks[l].length      = BVAL(lock_buffer, 0x08);
 124                 in_locks[l].flags       = IVAL(lock_buffer, 0x10);
 125                 /* 0x14 - 4 reserved bytes */
 126
 127                 lock_buffer += 0x18;
 128         }
 129
 130         subreq = smbd_smb2_lock_send(req,
 131                                      req->sconn->smb2.event_ctx,
 132                                      req,
 133                                      in_smbpid,
 134                                      in_file_id_volatile,
 135                                      in_lock_count,
 136                                      in_locks);
 137         if (subreq == NULL) {
 138                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 139         }
 140         tevent_req_set_callback(subreq, smbd_smb2_request_lock_done, req);
 141
 142         return smbd_smb2_request_pending_queue(req, subreq);
 143 }
 144
 145 static void smbd_smb2_request_lock_done(struct tevent_req *subreq)
 146 {
 147         struct smbd_smb2_request *smb2req = tevent_req_callback_data(subreq,
 148                                         struct smbd_smb2_request);
 149         DATA_BLOB outbody;
 150         NTSTATUS status;
 151         NTSTATUS error; /* transport error */
 152
 153         if (smb2req->cancelled) {
 154                 const uint8_t *inhdr = (const uint8_t *)
 155                         smb2req->in.vector[smb2req->current_idx].iov_base;
 156                 uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
 157                 struct smbd_smb2_lock_state *state;
 158
 159                 DEBUG(10,("smbd_smb2_request_lock_done: cancelled mid %llu\n",
 160                         (unsigned long long)mid ));
 161
 162                 state = tevent_req_data(smb2req->subreq,
 163                                 struct smbd_smb2_lock_state);
 164
 165                 SMB_ASSERT(state);
 166                 SMB_ASSERT(state->blr);
 167
 168                 remove_pending_lock(state, state->blr);
 169
 170                 error = smbd_smb2_request_error(smb2req, NT_STATUS_CANCELLED);
 171                 if (!NT_STATUS_IS_OK(error)) {
 172                         smbd_server_connection_terminate(smb2req->sconn,
 173                                 nt_errstr(error));
 174                         return;
 175                 }
 176                 return;
 177         }
 178
 179         status = smbd_smb2_lock_recv(subreq);
 180         TALLOC_FREE(subreq);
 181         if (!NT_STATUS_IS_OK(status)) {
 182                 error = smbd_smb2_request_error(smb2req, status);
 183                 if (!NT_STATUS_IS_OK(error)) {
 184                         smbd_server_connection_terminate(smb2req->sconn,
 185                                                          nt_errstr(error));
 186                         return;
 187                 }
 188                 return;
 189         }
 190
 191         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x04);
 192         if (outbody.data == NULL) {
 193                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 194                 if (!NT_STATUS_IS_OK(error)) {
 195                         smbd_server_connection_terminate(smb2req->sconn,
 196                                                          nt_errstr(error));
 197                         return;
 198                 }
 199                 return;
 200         }
 201
 202         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 203         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 204
 205         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 206         if (!NT_STATUS_IS_OK(error)) {
 207                 smbd_server_connection_terminate(smb2req->sconn,
 208                                                  nt_errstr(error));
 209                 return;
 210         }
 211 }
 212
 213 static struct tevent_req *smbd_smb2_lock_send(TALLOC_CTX *mem_ctx,
 214                                                  struct tevent_context *ev,
 215                                                  struct smbd_smb2_request *smb2req,
 216                                                  uint32_t in_smbpid,
 217                                                  uint64_t in_file_id_volatile,
 218                                                  uint16_t in_lock_count,
 219                                                  struct smbd_smb2_lock_element *in_locks)
 220 {
 221         struct tevent_req *req;
 222         struct smbd_smb2_lock_state *state;
 223         struct smb_request *smb1req;
 224         connection_struct *conn = smb2req->tcon->compat_conn;
 225         files_struct *fsp;
 226         int32_t timeout = -1;
 227         bool isunlock = false;
 228         uint16_t i;
 229         struct smbd_lock_element *locks;
 230         NTSTATUS status;
 231         bool async = false;
 232
 233         req = tevent_req_create(mem_ctx, &state,
 234                         struct smbd_smb2_lock_state);
 235         if (req == NULL) {
 236                 return NULL;
 237         }
 238         state->smb2req = smb2req;
 239         smb2req->subreq = req; /* So we can find this when going async. */
 240
 241         smb1req = smbd_smb2_fake_smb_request(smb2req);
 242         if (tevent_req_nomem(smb1req, req)) {
 243                 return tevent_req_post(req, ev);
 244         }
 245         state->smb1req = smb1req;
 246
 247         DEBUG(10,("smbd_smb2_lock_send: file_id[0x%016llX]\n",
 248                   (unsigned long long)in_file_id_volatile));
 249
 250         fsp = file_fsp(smb1req, (uint16_t)in_file_id_volatile);
 251         if (fsp == NULL) {
 252                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 253                 return tevent_req_post(req, ev);
 254         }
 255         if (conn != fsp->conn) {
 256                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 257                 return tevent_req_post(req, ev);
 258         }
 259         if (smb2req->session->vuid != fsp->vuid) {
 260                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 261                 return tevent_req_post(req, ev);
 262         }
 263
 264         locks = talloc_array(state, struct smbd_lock_element, in_lock_count);
 265         if (locks == NULL) {
 266                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 267                 return tevent_req_post(req, ev);
 268         }
 269
 270         switch (in_locks[0].flags) {
 271         case SMB2_LOCK_FLAG_SHARED:
 272         case SMB2_LOCK_FLAG_EXCLUSIVE:
 273                 if (in_lock_count > 1) {
 274                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 275                         return tevent_req_post(req, ev);
 276                 }
 277                 timeout = -1;
 278                 break;
 279
 280         case SMB2_LOCK_FLAG_SHARED|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 281         case SMB2_LOCK_FLAG_EXCLUSIVE|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 282                 timeout = 0;
 283                 break;
 284
 285         case SMB2_LOCK_FLAG_UNLOCK:
 286                 /* only the first lock gives the UNLOCK bit - see
 287                    MS-SMB2 3.3.5.14 */
 288                 isunlock = true;
 289                 timeout = 0;
 290                 break;
 291
 292         default:
 293                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 294                 return tevent_req_post(req, ev);
 295         }
 296
 297         for (i=0; i<in_lock_count; i++) {
 298                 bool invalid = false;
 299
 300                 switch (in_locks[i].flags) {
 301                 case SMB2_LOCK_FLAG_SHARED:
 302                 case SMB2_LOCK_FLAG_EXCLUSIVE:
 303                         if (isunlock) {
 304                                 invalid = true;
 305                                 break;
 306                         }
 307                         if (i > 0) {
 308                                 tevent_req_nterror(req,
 309                                                    NT_STATUS_INVALID_PARAMETER);
 310                                 return tevent_req_post(req, ev);
 311                         }
 312                         break;
 313
 314                 case SMB2_LOCK_FLAG_SHARED|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 315                 case SMB2_LOCK_FLAG_EXCLUSIVE|SMB2_LOCK_FLAG_FAIL_IMMEDIATELY:
 316                         if (isunlock) {
 317                                 invalid = true;
 318                         }
 319                         break;
 320
 321                 case SMB2_LOCK_FLAG_UNLOCK:
 322                         if (!isunlock) {
 323                                 tevent_req_nterror(req,
 324                                                    NT_STATUS_INVALID_PARAMETER);
 325                                 return tevent_req_post(req, ev);
 326                         }
 327                         break;
 328
 329                 default:
 330                         if (isunlock) {
 331                                 /*
 332                                  * is the first element was a UNLOCK
 333                                  * we need to deferr the error response
 334                                  * to the backend, because we need to process
 335                                  * all unlock elements before
 336                                  */
 337                                 invalid = true;
 338                                 break;
 339                         }
 340                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 341                         return tevent_req_post(req, ev);
 342                 }
 343
 344                 locks[i].smblctx = in_file_id_volatile;
 345                 locks[i].offset = in_locks[i].offset;
 346                 locks[i].count  = in_locks[i].length;
 347
 348                 if (in_locks[i].flags & SMB2_LOCK_FLAG_EXCLUSIVE) {
 349                         locks[i].brltype = WRITE_LOCK;
 350                 } else if (in_locks[i].flags & SMB2_LOCK_FLAG_SHARED) {
 351                         locks[i].brltype = READ_LOCK;
 352                 } else if (invalid) {
 353                         /*
 354                          * this is an invalid UNLOCK element
 355                          * and the backend needs to test for
 356                          * brltype != UNLOCK_LOCK and return
 357                          * NT_STATUS_INVALID_PARAMER
 358                          */
 359                         locks[i].brltype = READ_LOCK;
 360                 } else {
 361                         locks[i].brltype = UNLOCK_LOCK;
 362                 }
 363
 364                 DEBUG(10,("smbd_smb2_lock_send: index %d offset=%llu, count=%llu, "
 365                         "smblctx = %llu type %d\n",
 366                         i,
 367                         (unsigned long long)locks[i].offset,
 368                         (unsigned long long)locks[i].count,
 369                         (unsigned long long)locks[i].smblctx,
 370                         (int)locks[i].brltype ));
 371         }
 372
 373         state->locks = locks;
 374         state->lock_count = in_lock_count;
 375
 376         if (isunlock) {
 377                 status = smbd_do_locking(smb1req, fsp,
 378                                          0,
 379                                          timeout,
 380                                          in_lock_count,
 381                                          locks,
 382                                          0,
 383                                          NULL,
 384                                          &async);
 385         } else {
 386                 status = smbd_do_locking(smb1req, fsp,
 387                                          0,
 388                                          timeout,
 389                                          0,
 390                                          NULL,
 391                                          in_lock_count,
 392                                          locks,
 393                                          &async);
 394         }
 395         if (!NT_STATUS_IS_OK(status)) {
 396                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_LOCK_CONFLICT)) {
 397                        status = NT_STATUS_LOCK_NOT_GRANTED;
 398                 }
 399                 tevent_req_nterror(req, status);
 400                 return tevent_req_post(req, ev);
 401         }
 402
 403         if (async) {
 404                 return req;
 405         }
 406
 407         tevent_req_done(req);
 408         return tevent_req_post(req, ev);
 409 }
 410
 411 static NTSTATUS smbd_smb2_lock_recv(struct tevent_req *req)
 412 {
 413         NTSTATUS status;
 414
 415         if (tevent_req_is_nterror(req, &status)) {
 416                 tevent_req_received(req);
 417                 return status;
 418         }
 419
 420         tevent_req_received(req);
 421         return NT_STATUS_OK;
 422 }
 423
 424 /****************************************************************
 425  Cancel an outstanding blocking lock request.
 426 *****************************************************************/
 427
 428 static bool smbd_smb2_lock_cancel(struct tevent_req *req)
 429 {
 430         struct smbd_smb2_request *smb2req = NULL;
 431         struct smbd_smb2_lock_state *state = tevent_req_data(req,
 432                                 struct smbd_smb2_lock_state);
 433         if (!state) {
 434                 return false;
 435         }
 436
 437         if (!state->smb2req) {
 438                 return false;
 439         }
 440
 441         smb2req = state->smb2req;
 442         smb2req->cancelled = true;
 443
 444         tevent_req_done(req);
 445         return true;
 446 }
 447
 448 /****************************************************************
 449  Got a message saying someone unlocked a file. Re-schedule all
 450  blocking lock requests as we don't know if anything overlapped.
 451 *****************************************************************/
 452
 453 static void received_unlock_msg(struct messaging_context *msg,
 454                                 void *private_data,
 455                                 uint32_t msg_type,
 456                                 struct server_id server_id,
 457                                 DATA_BLOB *data)
 458 {
 459         struct smbd_server_connection *sconn;
 460
 461         DEBUG(10,("received_unlock_msg (SMB2)\n"));
 462
 463         sconn = msg_ctx_to_sconn(msg);
 464         if (sconn == NULL) {
 465                 DEBUG(1, ("could not find sconn\n"));
 466                 return;
 467         }
 468         process_blocking_lock_queue_smb2(sconn, timeval_current());
 469 }
 470
 471 /****************************************************************
 472  Function to get the blr on a pending record.
 473 *****************************************************************/
 474
 475 struct blocking_lock_record *get_pending_smb2req_blr(struct smbd_smb2_request *smb2req)
 476 {
 477         struct smbd_smb2_lock_state *state = NULL;
 478         const uint8_t *inhdr;
 479
 480         if (!smb2req) {
 481                 return NULL;
 482         }
 483         if (smb2req->subreq == NULL) {
 484                 return NULL;
 485         }
 486         if (!tevent_req_is_in_progress(smb2req->subreq)) {
 487                 return NULL;
 488         }
 489         inhdr = (const uint8_t *)smb2req->in.vector[smb2req->current_idx].iov_base;
 490         if (SVAL(inhdr, SMB2_HDR_OPCODE) != SMB2_OP_LOCK) {
 491                 return NULL;
 492         }
 493         state = tevent_req_data(smb2req->subreq,
 494                         struct smbd_smb2_lock_state);
 495         if (!state) {
 496                 return NULL;
 497         }
 498         return state->blr;
 499 }
 500 /****************************************************************
 501  Set up the next brl timeout.
 502 *****************************************************************/
 503
 504 static bool recalc_smb2_brl_timeout(struct smbd_server_connection *sconn)
 505 {
 506         struct smbd_smb2_request *smb2req;
 507         struct timeval next_timeout = timeval_zero();
 508         int max_brl_timeout = lp_parm_int(-1, "brl", "recalctime", 5);
 509
 510         TALLOC_FREE(sconn->smb2.locks.brl_timeout);
 511
 512         for (smb2req = sconn->smb2.requests; smb2req; smb2req = smb2req->next) {
 513                 struct blocking_lock_record *blr =
 514                         get_pending_smb2req_blr(smb2req);
 515                 if (!blr) {
 516                         continue;
 517                 }
 518                 if (timeval_is_zero(&blr->expire_time)) {
 519                         /*
 520                          * If we're blocked on pid 0xFFFFFFFFFFFFFFFFLL this is
 521                          * a POSIX lock, so calculate a timeout of
 522                          * 10 seconds into the future.
 523                          */
 524                         if (blr->blocking_smblctx == 0xFFFFFFFFFFFFFFFFLL) {
 525                                 struct timeval psx_to = timeval_current_ofs(10, 0);
 526                                 next_timeout = timeval_brl_min(&next_timeout, &psx_to);
 527                         }
 528
 529                         continue;
 530                 }
 531
 532                 next_timeout = timeval_brl_min(&next_timeout, &blr->expire_time);
 533         }
 534
 535         if (timeval_is_zero(&next_timeout)) {
 536                 DEBUG(10, ("recalc_smb2_brl_timeout:Next "
 537                         "timeout = Infinite.\n"));
 538                 return true;
 539         }
 540
 541         /*
 542          * To account for unclean shutdowns by clients we need a
 543          * maximum timeout that we use for checking pending locks. If
 544          * we have any pending locks at all, then check if the pending
 545          * lock can continue at least every brl:recalctime seconds
 546          * (default 5 seconds).
 547          *
 548          * This saves us needing to do a message_send_all() in the
 549          * SIGCHLD handler in the parent daemon. That
 550          * message_send_all() caused O(n^2) work to be done when IP
 551          * failovers happened in clustered Samba, which could make the
 552          * entire system unusable for many minutes.
 553          */
 554
 555         if (max_brl_timeout > 0) {
 556                 struct timeval min_to = timeval_current_ofs(max_brl_timeout, 0);
 557                 next_timeout = timeval_brl_min(&next_timeout, &min_to);
 558         }
 559
 560         if (DEBUGLVL(10)) {
 561                 struct timeval cur, from_now;
 562
 563                 cur = timeval_current();
 564                 from_now = timeval_until(&cur, &next_timeout);
 565                 DEBUG(10, ("recalc_smb2_brl_timeout: Next "
 566                         "timeout = %d.%d seconds from now.\n",
 567                         (int)from_now.tv_sec, (int)from_now.tv_usec));
 568         }
 569
 570         sconn->smb2.locks.brl_timeout = event_add_timed(
 571                                 server_event_context(),
 572                                 NULL,
 573                                 next_timeout,
 574                                 brl_timeout_fn,
 575                                 NULL);
 576         if (!sconn->smb2.locks.brl_timeout) {
 577                 return false;
 578         }
 579         return true;
 580 }
 581
 582 /****************************************************************
 583  Get an SMB2 lock reqeust to go async. lock_timeout should
 584  always be -1 here.
 585 *****************************************************************/
 586
 587 bool push_blocking_lock_request_smb2( struct byte_range_lock *br_lck,
 588                                 struct smb_request *smb1req,
 589                                 files_struct *fsp,
 590                                 int lock_timeout,
 591                                 int lock_num,
 592                                 uint64_t smblctx,
 593                                 enum brl_type lock_type,
 594                                 enum brl_flavour lock_flav,
 595                                 uint64_t offset,
 596                                 uint64_t count,
 597                                 uint64_t blocking_smblctx)
 598 {
 599         struct smbd_server_connection *sconn = smb1req->sconn;
 600         struct smbd_smb2_request *smb2req = smb1req->smb2req;
 601         struct tevent_req *req = NULL;
 602         struct smbd_smb2_lock_state *state = NULL;
 603         struct blocking_lock_record *blr = NULL;
 604         NTSTATUS status = NT_STATUS_OK;
 605
 606         if (!smb2req) {
 607                 return false;
 608         }
 609         req = smb2req->subreq;
 610         if (!req) {
 611                 return false;
 612         }
 613         if (!tevent_req_is_in_progress(smb2req->subreq)) {
 614                 return false;
 615         }
 616         state = tevent_req_data(req, struct smbd_smb2_lock_state);
 617         if (!state) {
 618                 return false;
 619         }
 620
 621         blr = talloc_zero(state, struct blocking_lock_record);
 622         if (!blr) {
 623                 return false;
 624         }
 625         blr->fsp = fsp;
 626
 627         if (lock_timeout == -1) {
 628                 blr->expire_time.tv_sec = 0;
 629                 blr->expire_time.tv_usec = 0; /* Never expire. */
 630         } else {
 631                 blr->expire_time = timeval_current_ofs_msec(lock_timeout);
 632         }
 633
 634         blr->lock_num = lock_num;
 635         blr->smblctx = smblctx;
 636         blr->blocking_smblctx = blocking_smblctx;
 637         blr->lock_flav = lock_flav;
 638         blr->lock_type = lock_type;
 639         blr->offset = offset;
 640         blr->count = count;
 641
 642         /* Specific brl_lock() implementations can fill this in. */
 643         blr->blr_private = NULL;
 644
 645         /* Add a pending lock record for this. */
 646         status = brl_lock(sconn->msg_ctx,
 647                         br_lck,
 648                         smblctx,
 649                         sconn_server_id(sconn),
 650                         offset,
 651                         count,
 652                         lock_type == READ_LOCK ? PENDING_READ_LOCK : PENDING_WRITE_LOCK,
 653                         blr->lock_flav,
 654                         true,
 655                         NULL,
 656                         blr);
 657
 658         if (!NT_STATUS_IS_OK(status)) {
 659                 DEBUG(0,("push_blocking_lock_request_smb2: "
 660                         "failed to add PENDING_LOCK record.\n"));
 661                 TALLOC_FREE(blr);
 662                 return false;
 663         }
 664         state->blr = blr;
 665
 666         DEBUG(10,("push_blocking_lock_request_smb2: file %s timeout %d\n",
 667                 fsp_str_dbg(fsp),
 668                 lock_timeout ));
 669
 670         recalc_smb2_brl_timeout(sconn);
 671
 672         /* Ensure we'll receive messages when this is unlocked. */
 673         if (!sconn->smb2.locks.blocking_lock_unlock_state) {
 674                 messaging_register(sconn->msg_ctx, NULL,
 675                                 MSG_SMB_UNLOCK, received_unlock_msg);
 676                 sconn->smb2.locks.blocking_lock_unlock_state = true;
 677         }
 678
 679         /* allow this request to be canceled */
 680         tevent_req_set_cancel_fn(req, smbd_smb2_lock_cancel);
 681
 682         return true;
 683 }
 684
 685 /****************************************************************
 686  Remove a pending lock record under lock.
 687 *****************************************************************/
 688
 689 static void remove_pending_lock(struct smbd_smb2_lock_state *state,
 690                         struct blocking_lock_record *blr)
 691 {
 692         int i;
 693         struct byte_range_lock *br_lck = brl_get_locks(
 694                                 state, blr->fsp);
 695
 696         DEBUG(10, ("remove_pending_lock: BLR = %p\n", blr));
 697
 698         if (br_lck) {
 699                 brl_lock_cancel(br_lck,
 700                                 blr->smblctx,
 701                                 sconn_server_id(blr->fsp->conn->sconn),
 702                                 blr->offset,
 703                                 blr->count,
 704                                 blr->lock_flav,
 705                                 blr);
 706                 TALLOC_FREE(br_lck);
 707         }
 708
 709         /* Remove the locks we already got. */
 710
 711         for(i = blr->lock_num - 1; i >= 0; i--) {
 712                 struct smbd_lock_element *e = &state->locks[i];
 713
 714                 do_unlock(blr->fsp->conn->sconn->msg_ctx,
 715                         blr->fsp,
 716                         e->smblctx,
 717                         e->count,
 718                         e->offset,
 719                         WINDOWS_LOCK);
 720         }
 721 }
 722
 723 /****************************************************************
 724  Re-proccess a blocking lock request.
 725  This is equivalent to process_lockingX() inside smbd/blocking.c
 726 *****************************************************************/
 727
 728 static void reprocess_blocked_smb2_lock(struct smbd_smb2_request *smb2req,
 729                                 struct timeval tv_curr)
 730 {
 731         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 732         struct blocking_lock_record *blr = NULL;
 733         struct smbd_smb2_lock_state *state = NULL;
 734         files_struct *fsp = NULL;
 735
 736         if (!smb2req->subreq) {
 737                 return;
 738         }
 739         state = tevent_req_data(smb2req->subreq, struct smbd_smb2_lock_state);
 740         if (!state) {
 741                 return;
 742         }
 743
 744         blr = state->blr;
 745         fsp = blr->fsp;
 746
 747         /* Try and finish off getting all the outstanding locks. */
 748
 749         for (; blr->lock_num < state->lock_count; blr->lock_num++) {
 750                 struct byte_range_lock *br_lck = NULL;
 751                 struct smbd_lock_element *e = &state->locks[blr->lock_num];
 752
 753                 br_lck = do_lock(fsp->conn->sconn->msg_ctx,
 754                                 fsp,
 755                                 e->smblctx,
 756                                 e->count,
 757                                 e->offset,
 758                                 e->brltype,
 759                                 WINDOWS_LOCK,
 760                                 true,
 761                                 &status,
 762                                 &blr->blocking_smblctx,
 763                                 blr);
 764
 765                 TALLOC_FREE(br_lck);
 766
 767                 if (NT_STATUS_IS_ERR(status)) {
 768                         break;
 769                 }
 770         }
 771
 772         if(blr->lock_num == state->lock_count) {
 773                 /*
 774                  * Success - we got all the locks.
 775                  */
 776
 777                 DEBUG(3,("reprocess_blocked_smb2_lock SUCCESS file = %s, "
 778                         "fnum=%d num_locks=%d\n",
 779                         fsp_str_dbg(fsp),
 780                         fsp->fnum,
 781                         (int)state->lock_count));
 782
 783                 tevent_req_done(smb2req->subreq);
 784                 return;
 785         }
 786
 787         if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
 788                         !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
 789                 /*
 790                  * We have other than a "can't get lock"
 791                  * error. Return an error.
 792                  */
 793                 remove_pending_lock(state, blr);
 794                 tevent_req_nterror(smb2req->subreq, status);
 795                 return;
 796         }
 797
 798         /*
 799          * We couldn't get the locks for this record on the list.
 800          * If the time has expired, return a lock error.
 801          */
 802
 803         if (!timeval_is_zero(&blr->expire_time) &&
 804                         timeval_compare(&blr->expire_time, &tv_curr) <= 0) {
 805                 remove_pending_lock(state, blr);
 806                 tevent_req_nterror(smb2req->subreq, NT_STATUS_LOCK_NOT_GRANTED);
 807                 return;
 808         }
 809
 810         /*
 811          * Still can't get all the locks - keep waiting.
 812          */
 813
 814         DEBUG(10,("reprocess_blocked_smb2_lock: only got %d locks of %d needed "
 815                 "for file %s, fnum = %d. Still waiting....\n",
 816                 (int)blr->lock_num,
 817                 (int)state->lock_count,
 818                 fsp_str_dbg(fsp),
 819                 (int)fsp->fnum));
 820
 821         return;
 822
 823 }
 824
 825 /****************************************************************
 826  Attempt to proccess all outstanding blocking locks pending on
 827  the request queue.
 828 *****************************************************************/
 829
 830 void process_blocking_lock_queue_smb2(
 831         struct smbd_server_connection *sconn, struct timeval tv_curr)
 832 {
 833         struct smbd_smb2_request *smb2req, *nextreq;
 834
 835         for (smb2req = sconn->smb2.requests; smb2req; smb2req = nextreq) {
 836                 const uint8_t *inhdr;
 837
 838                 nextreq = smb2req->next;
 839
 840                 if (smb2req->subreq == NULL) {
 841                         /* This message has been processed. */
 842                         continue;
 843                 }
 844                 if (!tevent_req_is_in_progress(smb2req->subreq)) {
 845                         /* This message has been processed. */
 846                         continue;
 847                 }
 848
 849                 inhdr = (const uint8_t *)smb2req->in.vector[smb2req->current_idx].iov_base;
 850                 if (SVAL(inhdr, SMB2_HDR_OPCODE) == SMB2_OP_LOCK) {
 851                         reprocess_blocked_smb2_lock(smb2req, tv_curr);
 852                 }
 853         }
 854
 855         recalc_smb2_brl_timeout(sconn);
 856 }
 857
 858 /****************************************************************************
 859  Remove any locks on this fd. Called from file_close().
 860 ****************************************************************************/
 861
 862 void cancel_pending_lock_requests_by_fid_smb2(files_struct *fsp,
 863                         struct byte_range_lock *br_lck,
 864                         enum file_close_type close_type)
 865 {
 866         struct smbd_server_connection *sconn = fsp->conn->sconn;
 867         struct smbd_smb2_request *smb2req, *nextreq;
 868
 869         for (smb2req = sconn->smb2.requests; smb2req; smb2req = nextreq) {
 870                 struct smbd_smb2_lock_state *state = NULL;
 871                 files_struct *fsp_curr = NULL;
 872                 int i = smb2req->current_idx;
 873                 uint64_t in_file_id_volatile;
 874                 struct blocking_lock_record *blr = NULL;
 875                 const uint8_t *inhdr;
 876                 const uint8_t *inbody;
 877
 878                 nextreq = smb2req->next;
 879
 880                 if (smb2req->subreq == NULL) {
 881                         /* This message has been processed. */
 882                         continue;
 883                 }
 884                 if (!tevent_req_is_in_progress(smb2req->subreq)) {
 885                         /* This message has been processed. */
 886                         continue;
 887                 }
 888
 889                 inhdr = (const uint8_t *)smb2req->in.vector[i].iov_base;
 890                 if (SVAL(inhdr, SMB2_HDR_OPCODE) != SMB2_OP_LOCK) {
 891                         /* Not a lock call. */
 892                         continue;
 893                 }
 894
 895                 inbody = (const uint8_t *)smb2req->in.vector[i+1].iov_base;
 896                 in_file_id_volatile = BVAL(inbody, 0x10);
 897
 898                 state = tevent_req_data(smb2req->subreq,
 899                                 struct smbd_smb2_lock_state);
 900                 if (!state) {
 901                         /* Strange - is this even possible ? */
 902                         continue;
 903                 }
 904
 905                 fsp_curr = file_fsp(state->smb1req, (uint16_t)in_file_id_volatile);
 906                 if (fsp_curr == NULL) {
 907                         /* Strange - is this even possible ? */
 908                         continue;
 909                 }
 910
 911                 if (fsp_curr != fsp) {
 912                         /* It's not our fid */
 913                         continue;
 914                 }
 915
 916                 blr = state->blr;
 917
 918                 /* Remove the entries from the lock db. */
 919                 brl_lock_cancel(br_lck,
 920                                 blr->smblctx,
 921                                 sconn_server_id(sconn),
 922                                 blr->offset,
 923                                 blr->count,
 924                                 blr->lock_flav,
 925                                 blr);
 926
 927                 /* Finally end the request. */
 928                 if (close_type == SHUTDOWN_CLOSE) {
 929                         tevent_req_done(smb2req->subreq);
 930                 } else {
 931                         tevent_req_nterror(smb2req->subreq,
 932                                 NT_STATUS_RANGE_NOT_LOCKED);
 933                 }
 934         }
 935 }