source3/smbd/smb2_read.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 "system/filesys.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../libcli/smb/smb_common.h"
  26 #include "libcli/security/security.h"
  27 #include "../lib/util/tevent_ntstatus.h"
  28 #include "rpc_server/srv_pipe_hnd.h"
  29
  30 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
  31                                               struct tevent_context *ev,
  32                                               struct smbd_smb2_request *smb2req,
  33                                               struct files_struct *in_fsp,
  34                                               uint32_t in_length,
  35                                               uint64_t in_offset,
  36                                               uint32_t in_minimum,
  37                                               uint32_t in_remaining);
  38 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
  39                                     TALLOC_CTX *mem_ctx,
  40                                     DATA_BLOB *out_data,
  41                                     uint32_t *out_remaining);
  42
  43 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
  44 NTSTATUS smbd_smb2_request_process_read(struct smbd_smb2_request *req)
  45 {
  46         NTSTATUS status;
  47         const uint8_t *inbody;
  48         uint32_t in_length;
  49         uint64_t in_offset;
  50         uint64_t in_file_id_persistent;
  51         uint64_t in_file_id_volatile;
  52         struct files_struct *in_fsp;
  53         uint32_t in_minimum_count;
  54         uint32_t in_remaining_bytes;
  55         struct tevent_req *subreq;
  56
  57         status = smbd_smb2_request_verify_sizes(req, 0x31);
  58         if (!NT_STATUS_IS_OK(status)) {
  59                 return smbd_smb2_request_error(req, status);
  60         }
  61         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  62
  63         in_length               = IVAL(inbody, 0x04);
  64         in_offset               = BVAL(inbody, 0x08);
  65         in_file_id_persistent   = BVAL(inbody, 0x10);
  66         in_file_id_volatile     = BVAL(inbody, 0x18);
  67         in_minimum_count        = IVAL(inbody, 0x20);
  68         in_remaining_bytes      = IVAL(inbody, 0x28);
  69
  70         /* check the max read size */
  71         if (in_length > req->sconn->smb2.max_read) {
  72                 DEBUG(2,("smbd_smb2_request_process_read: "
  73                          "client ignored max read: %s: 0x%08X: 0x%08X\n",
  74                         __location__, in_length, req->sconn->smb2.max_read));
  75                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  76         }
  77
  78         status = smbd_smb2_request_verify_creditcharge(req, in_length);
  79         if (!NT_STATUS_IS_OK(status)) {
  80                 return smbd_smb2_request_error(req, status);
  81         }
  82
  83         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  84         if (in_fsp == NULL) {
  85                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  86         }
  87
  88         subreq = smbd_smb2_read_send(req, req->sconn->ev_ctx,
  89                                      req, in_fsp,
  90                                      in_length,
  91                                      in_offset,
  92                                      in_minimum_count,
  93                                      in_remaining_bytes);
  94         if (subreq == NULL) {
  95                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  96         }
  97         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
  98
  99         return smbd_smb2_request_pending_queue(req, subreq, 500);
 100 }
 101
 102 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
 103 {
 104         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 105                                         struct smbd_smb2_request);
 106         DATA_BLOB outbody;
 107         DATA_BLOB outdyn;
 108         uint8_t out_data_offset;
 109         DATA_BLOB out_data_buffer = data_blob_null;
 110         uint32_t out_data_remaining = 0;
 111         NTSTATUS status;
 112         NTSTATUS error; /* transport error */
 113
 114         status = smbd_smb2_read_recv(subreq,
 115                                      req,
 116                                      &out_data_buffer,
 117                                      &out_data_remaining);
 118         TALLOC_FREE(subreq);
 119         if (!NT_STATUS_IS_OK(status)) {
 120                 error = smbd_smb2_request_error(req, status);
 121                 if (!NT_STATUS_IS_OK(error)) {
 122                         smbd_server_connection_terminate(req->sconn,
 123                                                          nt_errstr(error));
 124                         return;
 125                 }
 126                 return;
 127         }
 128
 129         out_data_offset = SMB2_HDR_BODY + 0x10;
 130
 131         outbody = smbd_smb2_generate_outbody(req, 0x10);
 132         if (outbody.data == NULL) {
 133                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 134                 if (!NT_STATUS_IS_OK(error)) {
 135                         smbd_server_connection_terminate(req->sconn,
 136                                                          nt_errstr(error));
 137                         return;
 138                 }
 139                 return;
 140         }
 141
 142         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 143         SCVAL(outbody.data, 0x02,
 144               out_data_offset);                 /* data offset */
 145         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 146         SIVAL(outbody.data, 0x04,
 147               out_data_buffer.length);          /* data length */
 148         SIVAL(outbody.data, 0x08,
 149               out_data_remaining);              /* data remaining */
 150         SIVAL(outbody.data, 0x0C, 0);           /* reserved */
 151
 152         outdyn = out_data_buffer;
 153
 154         error = smbd_smb2_request_done(req, outbody, &outdyn);
 155         if (!NT_STATUS_IS_OK(error)) {
 156                 smbd_server_connection_terminate(req->sconn,
 157                                                  nt_errstr(error));
 158                 return;
 159         }
 160 }
 161
 162 struct smbd_smb2_read_state {
 163         struct smbd_smb2_request *smb2req;
 164         struct smb_request *smbreq;
 165         files_struct *fsp;
 166         uint32_t in_length;
 167         uint64_t in_offset;
 168         uint32_t in_minimum;
 169         DATA_BLOB out_headers;
 170         uint8_t _out_hdr_buf[NBT_HDR_SIZE + SMB2_HDR_BODY + 0x10];
 171         DATA_BLOB out_data;
 172         uint32_t out_remaining;
 173 };
 174
 175 static int smb2_smb2_read_state_deny_destructor(struct smbd_smb2_read_state *state)
 176 {
 177         return -1;
 178 }
 179
 180 /* struct smbd_smb2_read_state destructor. Send the SMB2_READ data. */
 181 static int smb2_sendfile_send_data(struct smbd_smb2_read_state *state)
 182 {
 183         struct lock_struct lock;
 184         uint32_t in_length = state->in_length;
 185         uint64_t in_offset = state->in_offset;
 186         files_struct *fsp = state->fsp;
 187         const DATA_BLOB *hdr = state->smb2req->queue_entry.sendfile_header;
 188         ssize_t nread;
 189         ssize_t ret;
 190
 191         nread = SMB_VFS_SENDFILE(fsp->conn->sconn->sock,
 192                                  fsp,
 193                                  hdr,
 194                                  in_offset,
 195                                  in_length);
 196         DEBUG(10,("smb2_sendfile_send_data: SMB_VFS_SENDFILE returned %d on file %s\n",
 197                 (int)nread,
 198                 fsp_str_dbg(fsp) ));
 199
 200         if (nread == -1) {
 201                 /*
 202                  * Returning ENOSYS means no data at all was sent.
 203                    Do this as a normal read. */
 204                 if (errno == ENOSYS) {
 205                         goto normal_read;
 206                 }
 207
 208                 if (errno == EINTR) {
 209                         /*
 210                          * Special hack for broken Linux with no working sendfile. If we
 211                          * return EINTR we sent the header but not the rest of the data.
 212                          * Fake this up by doing read/write calls.
 213                          */
 214                         set_use_sendfile(SNUM(fsp->conn), false);
 215                         nread = fake_sendfile(fsp, in_offset, in_length);
 216                         if (nread == -1) {
 217                                 DEBUG(0,("smb2_sendfile_send_data: "
 218                                         "fake_sendfile failed for "
 219                                         "file %s (%s).\n",
 220                                         fsp_str_dbg(fsp),
 221                                         strerror(errno)));
 222                                 exit_server_cleanly("smb2_sendfile_send_data: "
 223                                         "fake_sendfile failed");
 224                         }
 225                         goto out;
 226                 }
 227
 228                 DEBUG(0,("smb2_sendfile_send_data: sendfile failed for file "
 229                         "%s (%s). Terminating\n",
 230                         fsp_str_dbg(fsp),
 231                         strerror(errno)));
 232                 exit_server_cleanly("smb2_sendfile_send_data: sendfile failed");
 233         } else if (nread == 0) {
 234                 /*
 235                  * Some sendfile implementations return 0 to indicate
 236                  * that there was a short read, but nothing was
 237                  * actually written to the socket.  In this case,
 238                  * fallback to the normal read path so the header gets
 239                  * the correct byte count.
 240                  */
 241                 DEBUG(3, ("send_file_readX: sendfile sent zero bytes "
 242                         "falling back to the normal read: %s\n",
 243                         fsp_str_dbg(fsp)));
 244                 goto normal_read;
 245         }
 246
 247         /*
 248          * We got a short read
 249          */
 250         goto out;
 251
 252 normal_read:
 253         /* Send out the header. */
 254         ret = write_data(fsp->conn->sconn->sock,
 255                          (const char *)hdr->data, hdr->length);
 256         if (ret != hdr->length) {
 257                 char addr[INET6_ADDRSTRLEN];
 258                 /*
 259                  * Try and give an error message saying what
 260                  * client failed.
 261                  */
 262                 DEBUG(0, ("smb2_sendfile_send_data: write_data failed "
 263                           "for client %s. Error %s\n",
 264                           get_peer_addr(fsp->conn->sconn->sock, addr,
 265                                         sizeof(addr)),
 266                           strerror(errno)));
 267
 268                 DEBUG(0,("smb2_sendfile_send_data: write_data failed for file "
 269                          "%s (%s). Terminating\n", fsp_str_dbg(fsp),
 270                          strerror(errno)));
 271                 exit_server_cleanly("smb2_sendfile_send_data: write_data failed");
 272         }
 273         nread = fake_sendfile(fsp, in_offset, in_length);
 274         if (nread == -1) {
 275                 DEBUG(0,("smb2_sendfile_send_data: "
 276                         "fake_sendfile failed for file "
 277                         "%s (%s). Terminating\n",
 278                         fsp_str_dbg(fsp),
 279                         strerror(errno)));
 280                 exit_server_cleanly("smb2_sendfile_send_data: "
 281                         "fake_sendfile failed");
 282         }
 283
 284   out:
 285
 286         if (nread < in_length) {
 287                 sendfile_short_send(fsp, nread, hdr->length, in_length);
 288         }
 289
 290         init_strict_lock_struct(fsp,
 291                                 fsp->op->global->open_persistent_id,
 292                                 in_offset,
 293                                 in_length,
 294                                 READ_LOCK,
 295                                 &lock);
 296
 297         SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lock);
 298         return 0;
 299 }
 300
 301 static NTSTATUS schedule_smb2_sendfile_read(struct smbd_smb2_request *smb2req,
 302                                         struct smbd_smb2_read_state *state)
 303 {
 304         files_struct *fsp = state->fsp;
 305
 306         /*
 307          * We cannot use sendfile if...
 308          * We were not configured to do so OR
 309          * Signing is active OR
 310          * This is a compound SMB2 operation OR
 311          * fsp is a STREAM file OR
 312          * We're using a write cache OR
 313          * It's not a regular file OR
 314          * Requested offset is greater than file size OR
 315          * there's not enough data in the file.
 316          * Phew :-). Luckily this means most
 317          * reads on most normal files. JRA.
 318         */
 319
 320         if (!lp__use_sendfile(SNUM(fsp->conn)) ||
 321             smb2req->do_signing ||
 322             smb2req->do_encryption ||
 323             smb2req->in.vector_count >= (2*SMBD_SMB2_NUM_IOV_PER_REQ) ||
 324             (fsp->base_fsp != NULL) ||
 325             (fsp->wcp != NULL) ||
 326             (!S_ISREG(fsp->fsp_name->st.st_ex_mode)) ||
 327             (state->in_offset >= fsp->fsp_name->st.st_ex_size) ||
 328             (fsp->fsp_name->st.st_ex_size < state->in_offset + state->in_length))
 329         {
 330                 return NT_STATUS_RETRY;
 331         }
 332
 333         /* We've already checked there's this amount of data
 334            to read. */
 335         state->out_data.length = state->in_length;
 336         state->out_remaining = 0;
 337
 338         state->out_headers = data_blob_const(state->_out_hdr_buf,
 339                                              sizeof(state->_out_hdr_buf));
 340         return NT_STATUS_OK;
 341 }
 342
 343 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq);
 344
 345 /*******************************************************************
 346  Common read complete processing function for both synchronous and
 347  asynchronous reads.
 348 *******************************************************************/
 349
 350 NTSTATUS smb2_read_complete(struct tevent_req *req, ssize_t nread, int err)
 351 {
 352         struct smbd_smb2_read_state *state = tevent_req_data(req,
 353                                         struct smbd_smb2_read_state);
 354         files_struct *fsp = state->fsp;
 355
 356         if (nread < 0) {
 357                 NTSTATUS status = map_nt_error_from_unix(err);
 358
 359                 DEBUG( 3,( "smb2_read_complete: file %s nread = %d. "
 360                         "Error = %s (NTSTATUS %s)\n",
 361                         fsp_str_dbg(fsp),
 362                         (int)nread,
 363                         strerror(err),
 364                         nt_errstr(status)));
 365
 366                 return status;
 367         }
 368         if (nread == 0 && state->in_length != 0) {
 369                 DEBUG(5,("smb2_read_complete: read_file[%s] end of file\n",
 370                         fsp_str_dbg(fsp)));
 371                 return NT_STATUS_END_OF_FILE;
 372         }
 373
 374         if (nread < state->in_minimum) {
 375                 DEBUG(5,("smb2_read_complete: read_file[%s] read less %d than "
 376                         "minimum requested %u. Returning end of file\n",
 377                         fsp_str_dbg(fsp),
 378                         (int)nread,
 379                         (unsigned int)state->in_minimum));
 380                 return NT_STATUS_END_OF_FILE;
 381         }
 382
 383         DEBUG(3,("smbd_smb2_read: %s, file %s, length=%lu offset=%lu read=%lu\n",
 384                 fsp_fnum_dbg(fsp),
 385                 fsp_str_dbg(fsp),
 386                 (unsigned long)state->in_length,
 387                 (unsigned long)state->in_offset,
 388                 (unsigned long)nread));
 389
 390         state->out_data.length = nread;
 391         state->out_remaining = 0;
 392
 393         return NT_STATUS_OK;
 394 }
 395
 396 static bool smbd_smb2_read_cancel(struct tevent_req *req)
 397 {
 398         struct smbd_smb2_read_state *state =
 399                 tevent_req_data(req,
 400                 struct smbd_smb2_read_state);
 401
 402         return cancel_smb2_aio(state->smbreq);
 403 }
 404
 405 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
 406                                               struct tevent_context *ev,
 407                                               struct smbd_smb2_request *smb2req,
 408                                               struct files_struct *fsp,
 409                                               uint32_t in_length,
 410                                               uint64_t in_offset,
 411                                               uint32_t in_minimum,
 412                                               uint32_t in_remaining)
 413 {
 414         NTSTATUS status;
 415         struct tevent_req *req = NULL;
 416         struct smbd_smb2_read_state *state = NULL;
 417         struct smb_request *smbreq = NULL;
 418         connection_struct *conn = smb2req->tcon->compat;
 419         ssize_t nread = -1;
 420         struct lock_struct lock;
 421         int saved_errno;
 422
 423         req = tevent_req_create(mem_ctx, &state,
 424                                 struct smbd_smb2_read_state);
 425         if (req == NULL) {
 426                 return NULL;
 427         }
 428         state->smb2req = smb2req;
 429         state->in_length = in_length;
 430         state->in_offset = in_offset;
 431         state->in_minimum = in_minimum;
 432         state->out_data = data_blob_null;
 433         state->out_remaining = 0;
 434
 435         DEBUG(10,("smbd_smb2_read: %s - %s\n",
 436                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 437
 438         smbreq = smbd_smb2_fake_smb_request(smb2req);
 439         if (tevent_req_nomem(smbreq, req)) {
 440                 return tevent_req_post(req, ev);
 441         }
 442         state->smbreq = smbreq;
 443
 444         if (fsp->is_directory) {
 445                 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 446                 return tevent_req_post(req, ev);
 447         }
 448
 449         state->fsp = fsp;
 450
 451         if (IS_IPC(smbreq->conn)) {
 452                 struct tevent_req *subreq = NULL;
 453
 454                 state->out_data = data_blob_talloc(state, NULL, in_length);
 455                 if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
 456                         return tevent_req_post(req, ev);
 457                 }
 458
 459                 if (!fsp_is_np(fsp)) {
 460                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 461                         return tevent_req_post(req, ev);
 462                 }
 463
 464                 subreq = np_read_send(state, ev,
 465                                       fsp->fake_file_handle,
 466                                       state->out_data.data,
 467                                       state->out_data.length);
 468                 if (tevent_req_nomem(subreq, req)) {
 469                         return tevent_req_post(req, ev);
 470                 }
 471                 tevent_req_set_callback(subreq,
 472                                         smbd_smb2_read_pipe_done,
 473                                         req);
 474                 return req;
 475         }
 476
 477         if (!CHECK_READ(fsp, smbreq)) {
 478                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 479                 return tevent_req_post(req, ev);
 480         }
 481
 482         status = schedule_smb2_aio_read(fsp->conn,
 483                                 smbreq,
 484                                 fsp,
 485                                 state,
 486                                 &state->out_data,
 487                                 (off_t)in_offset,
 488                                 (size_t)in_length);
 489
 490         if (NT_STATUS_IS_OK(status)) {
 491                 /*
 492                  * Doing an async read, allow this
 493                  * request to be canceled
 494                  */
 495                 tevent_req_set_cancel_fn(req, smbd_smb2_read_cancel);
 496                 return req;
 497         }
 498
 499         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 500                 /* Real error in setting up aio. Fail. */
 501                 tevent_req_nterror(req, status);
 502                 return tevent_req_post(req, ev);
 503         }
 504
 505         /* Fallback to synchronous. */
 506
 507         init_strict_lock_struct(fsp,
 508                                 fsp->op->global->open_persistent_id,
 509                                 in_offset,
 510                                 in_length,
 511                                 READ_LOCK,
 512                                 &lock);
 513
 514         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 515                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 516                 return tevent_req_post(req, ev);
 517         }
 518
 519         /* Try sendfile in preference. */
 520         status = schedule_smb2_sendfile_read(smb2req, state);
 521         if (NT_STATUS_IS_OK(status)) {
 522                 tevent_req_done(req);
 523                 return tevent_req_post(req, ev);
 524         } else {
 525                 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 526                         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 527                         tevent_req_nterror(req, status);
 528                         return tevent_req_post(req, ev);
 529                 }
 530         }
 531
 532         /* Ok, read into memory. Allocate the out buffer. */
 533         state->out_data = data_blob_talloc(state, NULL, in_length);
 534         if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
 535                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 536                 return tevent_req_post(req, ev);
 537         }
 538
 539         nread = read_file(fsp,
 540                           (char *)state->out_data.data,
 541                           in_offset,
 542                           in_length);
 543
 544         saved_errno = errno;
 545
 546         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 547
 548         DEBUG(10,("smbd_smb2_read: file %s, %s, offset=%llu "
 549                 "len=%llu returned %lld\n",
 550                 fsp_str_dbg(fsp),
 551                 fsp_fnum_dbg(fsp),
 552                 (unsigned long long)in_offset,
 553                 (unsigned long long)in_length,
 554                 (long long)nread));
 555
 556         status = smb2_read_complete(req, nread, saved_errno);
 557         if (!NT_STATUS_IS_OK(status)) {
 558                 tevent_req_nterror(req, status);
 559         } else {
 560                 /* Success. */
 561                 tevent_req_done(req);
 562         }
 563         return tevent_req_post(req, ev);
 564 }
 565
 566 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq)
 567 {
 568         struct tevent_req *req = tevent_req_callback_data(subreq,
 569                                  struct tevent_req);
 570         struct smbd_smb2_read_state *state = tevent_req_data(req,
 571                                              struct smbd_smb2_read_state);
 572         NTSTATUS status;
 573         ssize_t nread = -1;
 574         bool is_data_outstanding;
 575
 576         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 577         TALLOC_FREE(subreq);
 578         if (!NT_STATUS_IS_OK(status)) {
 579                 NTSTATUS old = status;
 580                 status = nt_status_np_pipe(old);
 581                 tevent_req_nterror(req, status);
 582                 return;
 583         }
 584
 585         if (nread == 0 && state->out_data.length != 0) {
 586                 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
 587                 return;
 588         }
 589
 590         state->out_data.length = nread;
 591         state->out_remaining = 0;
 592
 593         /*
 594          * TODO: add STATUS_BUFFER_OVERFLOW handling, once we also
 595          * handle it in SMB1 pipe_read_andx_done().
 596          */
 597
 598         tevent_req_done(req);
 599 }
 600
 601 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
 602                                     TALLOC_CTX *mem_ctx,
 603                                     DATA_BLOB *out_data,
 604                                     uint32_t *out_remaining)
 605 {
 606         NTSTATUS status;
 607         struct smbd_smb2_read_state *state = tevent_req_data(req,
 608                                              struct smbd_smb2_read_state);
 609
 610         if (tevent_req_is_nterror(req, &status)) {
 611                 tevent_req_received(req);
 612                 return status;
 613         }
 614
 615         *out_data = state->out_data;
 616         talloc_steal(mem_ctx, out_data->data);
 617         *out_remaining = state->out_remaining;
 618
 619         if (state->out_headers.length > 0) {
 620                 talloc_steal(mem_ctx, state);
 621                 talloc_set_destructor(state, smb2_smb2_read_state_deny_destructor);
 622                 tevent_req_received(req);
 623                 state->smb2req->queue_entry.sendfile_header = &state->out_headers;
 624                 talloc_set_destructor(state, smb2_sendfile_send_data);
 625         } else {
 626                 tevent_req_received(req);
 627         }
 628
 629         return NT_STATUS_OK;
 630 }