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         struct smbXsrv_connection *xconn = req->xconn;
  47         NTSTATUS status;
  48         const uint8_t *inbody;
  49         uint32_t in_length;
  50         uint64_t in_offset;
  51         uint64_t in_file_id_persistent;
  52         uint64_t in_file_id_volatile;
  53         struct files_struct *in_fsp;
  54         uint32_t in_minimum_count;
  55         uint32_t in_remaining_bytes;
  56         struct tevent_req *subreq;
  57
  58         status = smbd_smb2_request_verify_sizes(req, 0x31);
  59         if (!NT_STATUS_IS_OK(status)) {
  60                 return smbd_smb2_request_error(req, status);
  61         }
  62         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  63
  64         in_length               = IVAL(inbody, 0x04);
  65         in_offset               = BVAL(inbody, 0x08);
  66         in_file_id_persistent   = BVAL(inbody, 0x10);
  67         in_file_id_volatile     = BVAL(inbody, 0x18);
  68         in_minimum_count        = IVAL(inbody, 0x20);
  69         in_remaining_bytes      = IVAL(inbody, 0x28);
  70
  71         /* check the max read size */
  72         if (in_length > xconn->smb2.server.max_read) {
  73                 DEBUG(2,("smbd_smb2_request_process_read: "
  74                          "client ignored max read: %s: 0x%08X: 0x%08X\n",
  75                         __location__, in_length, xconn->smb2.server.max_read));
  76                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  77         }
  78
  79         status = smbd_smb2_request_verify_creditcharge(req, in_length);
  80         if (!NT_STATUS_IS_OK(status)) {
  81                 return smbd_smb2_request_error(req, status);
  82         }
  83
  84         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  85         if (in_fsp == NULL) {
  86                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  87         }
  88
  89         subreq = smbd_smb2_read_send(req, req->sconn->ev_ctx,
  90                                      req, in_fsp,
  91                                      in_length,
  92                                      in_offset,
  93                                      in_minimum_count,
  94                                      in_remaining_bytes);
  95         if (subreq == NULL) {
  96                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  97         }
  98         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
  99
 100         return smbd_smb2_request_pending_queue(req, subreq, 500);
 101 }
 102
 103 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
 104 {
 105         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 106                                         struct smbd_smb2_request);
 107         DATA_BLOB outbody;
 108         DATA_BLOB outdyn;
 109         uint8_t out_data_offset;
 110         DATA_BLOB out_data_buffer = data_blob_null;
 111         uint32_t out_data_remaining = 0;
 112         NTSTATUS status;
 113         NTSTATUS error; /* transport error */
 114
 115         status = smbd_smb2_read_recv(subreq,
 116                                      req,
 117                                      &out_data_buffer,
 118                                      &out_data_remaining);
 119         TALLOC_FREE(subreq);
 120         if (!NT_STATUS_IS_OK(status)) {
 121                 error = smbd_smb2_request_error(req, status);
 122                 if (!NT_STATUS_IS_OK(error)) {
 123                         smbd_server_connection_terminate(req->xconn,
 124                                                          nt_errstr(error));
 125                         return;
 126                 }
 127                 return;
 128         }
 129
 130         out_data_offset = SMB2_HDR_BODY + 0x10;
 131
 132         outbody = smbd_smb2_generate_outbody(req, 0x10);
 133         if (outbody.data == NULL) {
 134                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 135                 if (!NT_STATUS_IS_OK(error)) {
 136                         smbd_server_connection_terminate(req->xconn,
 137                                                          nt_errstr(error));
 138                         return;
 139                 }
 140                 return;
 141         }
 142
 143         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 144         SCVAL(outbody.data, 0x02,
 145               out_data_offset);                 /* data offset */
 146         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 147         SIVAL(outbody.data, 0x04,
 148               out_data_buffer.length);          /* data length */
 149         SIVAL(outbody.data, 0x08,
 150               out_data_remaining);              /* data remaining */
 151         SIVAL(outbody.data, 0x0C, 0);           /* reserved */
 152
 153         outdyn = out_data_buffer;
 154
 155         error = smbd_smb2_request_done(req, outbody, &outdyn);
 156         if (!NT_STATUS_IS_OK(error)) {
 157                 smbd_server_connection_terminate(req->xconn,
 158                                                  nt_errstr(error));
 159                 return;
 160         }
 161 }
 162
 163 struct smbd_smb2_read_state {
 164         struct smbd_smb2_request *smb2req;
 165         struct smb_request *smbreq;
 166         files_struct *fsp;
 167         uint32_t in_length;
 168         uint64_t in_offset;
 169         uint32_t in_minimum;
 170         DATA_BLOB out_headers;
 171         uint8_t _out_hdr_buf[NBT_HDR_SIZE + SMB2_HDR_BODY + 0x10];
 172         DATA_BLOB out_data;
 173         uint32_t out_remaining;
 174 };
 175
 176 static int smb2_smb2_read_state_deny_destructor(struct smbd_smb2_read_state *state)
 177 {
 178         return -1;
 179 }
 180
 181 /* struct smbd_smb2_read_state destructor. Send the SMB2_READ data. */
 182 static int smb2_sendfile_send_data(struct smbd_smb2_read_state *state)
 183 {
 184         struct lock_struct lock;
 185         uint32_t in_length = state->in_length;
 186         uint64_t in_offset = state->in_offset;
 187         files_struct *fsp = state->fsp;
 188         const DATA_BLOB *hdr = state->smb2req->queue_entry.sendfile_header;
 189         NTSTATUS *pstatus = state->smb2req->queue_entry.sendfile_status;
 190         struct smbXsrv_connection *xconn = state->smb2req->xconn;
 191         ssize_t nread;
 192         ssize_t ret;
 193         int saved_errno;
 194
 195         nread = SMB_VFS_SENDFILE(xconn->transport.sock,
 196                                  fsp,
 197                                  hdr,
 198                                  in_offset,
 199                                  in_length);
 200         DEBUG(10,("smb2_sendfile_send_data: SMB_VFS_SENDFILE returned %d on file %s\n",
 201                 (int)nread,
 202                 fsp_str_dbg(fsp) ));
 203
 204         if (nread == -1) {
 205                 saved_errno = errno;
 206
 207                 /*
 208                  * Returning ENOSYS means no data at all was sent.
 209                    Do this as a normal read. */
 210                 if (errno == ENOSYS) {
 211                         goto normal_read;
 212                 }
 213
 214                 if (errno == EINTR) {
 215                         /*
 216                          * Special hack for broken Linux with no working sendfile. If we
 217                          * return EINTR we sent the header but not the rest of the data.
 218                          * Fake this up by doing read/write calls.
 219                          */
 220                         set_use_sendfile(SNUM(fsp->conn), false);
 221                         nread = fake_sendfile(xconn, fsp, in_offset, in_length);
 222                         if (nread == -1) {
 223                                 saved_errno = errno;
 224                                 DEBUG(0,("smb2_sendfile_send_data: fake_sendfile "
 225                                          "failed for file %s (%s) for client %s. "
 226                                          "Terminating\n",
 227                                          fsp_str_dbg(fsp), strerror(saved_errno),
 228                                          smbXsrv_connection_dbg(xconn)));
 229                                 *pstatus = map_nt_error_from_unix_common(saved_errno);
 230                                 return 0;
 231                         }
 232                         goto out;
 233                 }
 234
 235                 DEBUG(0,("smb2_sendfile_send_data: sendfile failed for file "
 236                          "%s (%s) for client %s. Terminating\n",
 237                          fsp_str_dbg(fsp), strerror(saved_errno),
 238                          smbXsrv_connection_dbg(xconn)));
 239                 *pstatus = map_nt_error_from_unix_common(saved_errno);
 240                 return 0;
 241         } else if (nread == 0) {
 242                 /*
 243                  * Some sendfile implementations return 0 to indicate
 244                  * that there was a short read, but nothing was
 245                  * actually written to the socket.  In this case,
 246                  * fallback to the normal read path so the header gets
 247                  * the correct byte count.
 248                  */
 249                 DEBUG(3, ("send_file_readX: sendfile sent zero bytes "
 250                         "falling back to the normal read: %s\n",
 251                         fsp_str_dbg(fsp)));
 252                 goto normal_read;
 253         }
 254
 255         /*
 256          * We got a short read
 257          */
 258         goto out;
 259
 260 normal_read:
 261         /* Send out the header. */
 262         ret = write_data(xconn->transport.sock,
 263                          (const char *)hdr->data, hdr->length);
 264         if (ret != hdr->length) {
 265                 saved_errno = errno;
 266                 DEBUG(0,("smb2_sendfile_send_data: write_data failed for file "
 267                          "%s (%s) for client %s. Terminating\n",
 268                          fsp_str_dbg(fsp), strerror(saved_errno),
 269                          smbXsrv_connection_dbg(xconn)));
 270                 *pstatus = map_nt_error_from_unix_common(saved_errno);
 271                 return 0;
 272         }
 273         nread = fake_sendfile(xconn, fsp, in_offset, in_length);
 274         if (nread == -1) {
 275                 saved_errno = errno;
 276                 DEBUG(0,("smb2_sendfile_send_data: fake_sendfile "
 277                          "failed for file %s (%s) for client %s. "
 278                          "Terminating\n",
 279                          fsp_str_dbg(fsp), strerror(saved_errno),
 280                          smbXsrv_connection_dbg(xconn)));
 281                 *pstatus = map_nt_error_from_unix_common(saved_errno);
 282                 return 0;
 283         }
 284
 285   out:
 286
 287         if (nread < in_length) {
 288                 ret = sendfile_short_send(xconn, fsp, nread,
 289                                           hdr->length, in_length);
 290                 if (ret == -1) {
 291                         saved_errno = errno;
 292                         DEBUG(0,("%s: sendfile_short_send "
 293                                  "failed for file %s (%s) for client %s. "
 294                                  "Terminating\n",
 295                                  __func__,
 296                                  fsp_str_dbg(fsp), strerror(saved_errno),
 297                                  smbXsrv_connection_dbg(xconn)));
 298                         *pstatus = map_nt_error_from_unix_common(saved_errno);
 299                         return 0;
 300                 }
 301         }
 302
 303         init_strict_lock_struct(fsp,
 304                                 fsp->op->global->open_persistent_id,
 305                                 in_offset,
 306                                 in_length,
 307                                 READ_LOCK,
 308                                 &lock);
 309
 310         SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lock);
 311
 312         *pstatus = NT_STATUS_OK;
 313         return 0;
 314 }
 315
 316 static NTSTATUS schedule_smb2_sendfile_read(struct smbd_smb2_request *smb2req,
 317                                         struct smbd_smb2_read_state *state)
 318 {
 319         files_struct *fsp = state->fsp;
 320
 321         /*
 322          * We cannot use sendfile if...
 323          * We were not configured to do so OR
 324          * Signing is active OR
 325          * This is a compound SMB2 operation OR
 326          * fsp is a STREAM file OR
 327          * We're using a write cache OR
 328          * It's not a regular file OR
 329          * Requested offset is greater than file size OR
 330          * there's not enough data in the file.
 331          * Phew :-). Luckily this means most
 332          * reads on most normal files. JRA.
 333         */
 334
 335         if (!lp__use_sendfile(SNUM(fsp->conn)) ||
 336             smb2req->do_signing ||
 337             smb2req->do_encryption ||
 338             smb2req->in.vector_count >= (2*SMBD_SMB2_NUM_IOV_PER_REQ) ||
 339             (fsp->base_fsp != NULL) ||
 340             (fsp->wcp != NULL) ||
 341             (!S_ISREG(fsp->fsp_name->st.st_ex_mode)) ||
 342             (state->in_offset >= fsp->fsp_name->st.st_ex_size) ||
 343             (fsp->fsp_name->st.st_ex_size < state->in_offset + state->in_length))
 344         {
 345                 return NT_STATUS_RETRY;
 346         }
 347
 348         /* We've already checked there's this amount of data
 349            to read. */
 350         state->out_data.length = state->in_length;
 351         state->out_remaining = 0;
 352
 353         state->out_headers = data_blob_const(state->_out_hdr_buf,
 354                                              sizeof(state->_out_hdr_buf));
 355         return NT_STATUS_OK;
 356 }
 357
 358 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq);
 359
 360 /*******************************************************************
 361  Common read complete processing function for both synchronous and
 362  asynchronous reads.
 363 *******************************************************************/
 364
 365 NTSTATUS smb2_read_complete(struct tevent_req *req, ssize_t nread, int err)
 366 {
 367         struct smbd_smb2_read_state *state = tevent_req_data(req,
 368                                         struct smbd_smb2_read_state);
 369         files_struct *fsp = state->fsp;
 370
 371         if (nread < 0) {
 372                 NTSTATUS status = map_nt_error_from_unix(err);
 373
 374                 DEBUG( 3,( "smb2_read_complete: file %s nread = %d. "
 375                         "Error = %s (NTSTATUS %s)\n",
 376                         fsp_str_dbg(fsp),
 377                         (int)nread,
 378                         strerror(err),
 379                         nt_errstr(status)));
 380
 381                 return status;
 382         }
 383         if (nread == 0 && state->in_length != 0) {
 384                 DEBUG(5,("smb2_read_complete: read_file[%s] end of file\n",
 385                         fsp_str_dbg(fsp)));
 386                 return NT_STATUS_END_OF_FILE;
 387         }
 388
 389         if (nread < state->in_minimum) {
 390                 DEBUG(5,("smb2_read_complete: read_file[%s] read less %d than "
 391                         "minimum requested %u. Returning end of file\n",
 392                         fsp_str_dbg(fsp),
 393                         (int)nread,
 394                         (unsigned int)state->in_minimum));
 395                 return NT_STATUS_END_OF_FILE;
 396         }
 397
 398         DEBUG(3,("smbd_smb2_read: %s, file %s, length=%lu offset=%lu read=%lu\n",
 399                 fsp_fnum_dbg(fsp),
 400                 fsp_str_dbg(fsp),
 401                 (unsigned long)state->in_length,
 402                 (unsigned long)state->in_offset,
 403                 (unsigned long)nread));
 404
 405         state->out_data.length = nread;
 406         state->out_remaining = 0;
 407
 408         return NT_STATUS_OK;
 409 }
 410
 411 static bool smbd_smb2_read_cancel(struct tevent_req *req)
 412 {
 413         struct smbd_smb2_read_state *state =
 414                 tevent_req_data(req,
 415                 struct smbd_smb2_read_state);
 416
 417         return cancel_smb2_aio(state->smbreq);
 418 }
 419
 420 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
 421                                               struct tevent_context *ev,
 422                                               struct smbd_smb2_request *smb2req,
 423                                               struct files_struct *fsp,
 424                                               uint32_t in_length,
 425                                               uint64_t in_offset,
 426                                               uint32_t in_minimum,
 427                                               uint32_t in_remaining)
 428 {
 429         NTSTATUS status;
 430         struct tevent_req *req = NULL;
 431         struct smbd_smb2_read_state *state = NULL;
 432         struct smb_request *smbreq = NULL;
 433         connection_struct *conn = smb2req->tcon->compat;
 434         ssize_t nread = -1;
 435         struct lock_struct lock;
 436         int saved_errno;
 437
 438         req = tevent_req_create(mem_ctx, &state,
 439                                 struct smbd_smb2_read_state);
 440         if (req == NULL) {
 441                 return NULL;
 442         }
 443         state->smb2req = smb2req;
 444         state->in_length = in_length;
 445         state->in_offset = in_offset;
 446         state->in_minimum = in_minimum;
 447         state->out_data = data_blob_null;
 448         state->out_remaining = 0;
 449
 450         DEBUG(10,("smbd_smb2_read: %s - %s\n",
 451                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 452
 453         smbreq = smbd_smb2_fake_smb_request(smb2req);
 454         if (tevent_req_nomem(smbreq, req)) {
 455                 return tevent_req_post(req, ev);
 456         }
 457         state->smbreq = smbreq;
 458
 459         if (fsp->is_directory) {
 460                 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 461                 return tevent_req_post(req, ev);
 462         }
 463
 464         state->fsp = fsp;
 465
 466         if (IS_IPC(smbreq->conn)) {
 467                 struct tevent_req *subreq = NULL;
 468
 469                 state->out_data = data_blob_talloc(state, NULL, in_length);
 470                 if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
 471                         return tevent_req_post(req, ev);
 472                 }
 473
 474                 if (!fsp_is_np(fsp)) {
 475                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 476                         return tevent_req_post(req, ev);
 477                 }
 478
 479                 subreq = np_read_send(state, ev,
 480                                       fsp->fake_file_handle,
 481                                       state->out_data.data,
 482                                       state->out_data.length);
 483                 if (tevent_req_nomem(subreq, req)) {
 484                         return tevent_req_post(req, ev);
 485                 }
 486                 tevent_req_set_callback(subreq,
 487                                         smbd_smb2_read_pipe_done,
 488                                         req);
 489                 return req;
 490         }
 491
 492         if (!CHECK_READ(fsp, smbreq)) {
 493                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 494                 return tevent_req_post(req, ev);
 495         }
 496
 497         status = schedule_smb2_aio_read(fsp->conn,
 498                                 smbreq,
 499                                 fsp,
 500                                 state,
 501                                 &state->out_data,
 502                                 (off_t)in_offset,
 503                                 (size_t)in_length);
 504
 505         if (NT_STATUS_IS_OK(status)) {
 506                 /*
 507                  * Doing an async read, allow this
 508                  * request to be canceled
 509                  */
 510                 tevent_req_set_cancel_fn(req, smbd_smb2_read_cancel);
 511                 return req;
 512         }
 513
 514         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 515                 /* Real error in setting up aio. Fail. */
 516                 tevent_req_nterror(req, status);
 517                 return tevent_req_post(req, ev);
 518         }
 519
 520         /* Fallback to synchronous. */
 521
 522         init_strict_lock_struct(fsp,
 523                                 fsp->op->global->open_persistent_id,
 524                                 in_offset,
 525                                 in_length,
 526                                 READ_LOCK,
 527                                 &lock);
 528
 529         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 530                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 531                 return tevent_req_post(req, ev);
 532         }
 533
 534         /* Try sendfile in preference. */
 535         status = schedule_smb2_sendfile_read(smb2req, state);
 536         if (NT_STATUS_IS_OK(status)) {
 537                 tevent_req_done(req);
 538                 return tevent_req_post(req, ev);
 539         } else {
 540                 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 541                         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 542                         tevent_req_nterror(req, status);
 543                         return tevent_req_post(req, ev);
 544                 }
 545         }
 546
 547         /* Ok, read into memory. Allocate the out buffer. */
 548         state->out_data = data_blob_talloc(state, NULL, in_length);
 549         if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
 550                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 551                 return tevent_req_post(req, ev);
 552         }
 553
 554         nread = read_file(fsp,
 555                           (char *)state->out_data.data,
 556                           in_offset,
 557                           in_length);
 558
 559         saved_errno = errno;
 560
 561         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 562
 563         DEBUG(10,("smbd_smb2_read: file %s, %s, offset=%llu "
 564                 "len=%llu returned %lld\n",
 565                 fsp_str_dbg(fsp),
 566                 fsp_fnum_dbg(fsp),
 567                 (unsigned long long)in_offset,
 568                 (unsigned long long)in_length,
 569                 (long long)nread));
 570
 571         status = smb2_read_complete(req, nread, saved_errno);
 572         if (!NT_STATUS_IS_OK(status)) {
 573                 tevent_req_nterror(req, status);
 574         } else {
 575                 /* Success. */
 576                 tevent_req_done(req);
 577         }
 578         return tevent_req_post(req, ev);
 579 }
 580
 581 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq)
 582 {
 583         struct tevent_req *req = tevent_req_callback_data(subreq,
 584                                  struct tevent_req);
 585         struct smbd_smb2_read_state *state = tevent_req_data(req,
 586                                              struct smbd_smb2_read_state);
 587         NTSTATUS status;
 588         ssize_t nread = -1;
 589         bool is_data_outstanding;
 590
 591         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 592         TALLOC_FREE(subreq);
 593         if (!NT_STATUS_IS_OK(status)) {
 594                 NTSTATUS old = status;
 595                 status = nt_status_np_pipe(old);
 596                 tevent_req_nterror(req, status);
 597                 return;
 598         }
 599
 600         if (nread == 0 && state->out_data.length != 0) {
 601                 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
 602                 return;
 603         }
 604
 605         state->out_data.length = nread;
 606         state->out_remaining = 0;
 607
 608         /*
 609          * TODO: add STATUS_BUFFER_OVERFLOW handling, once we also
 610          * handle it in SMB1 pipe_read_andx_done().
 611          */
 612
 613         tevent_req_done(req);
 614 }
 615
 616 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
 617                                     TALLOC_CTX *mem_ctx,
 618                                     DATA_BLOB *out_data,
 619                                     uint32_t *out_remaining)
 620 {
 621         NTSTATUS status;
 622         struct smbd_smb2_read_state *state = tevent_req_data(req,
 623                                              struct smbd_smb2_read_state);
 624
 625         if (tevent_req_is_nterror(req, &status)) {
 626                 tevent_req_received(req);
 627                 return status;
 628         }
 629
 630         *out_data = state->out_data;
 631         talloc_steal(mem_ctx, out_data->data);
 632         *out_remaining = state->out_remaining;
 633
 634         if (state->out_headers.length > 0) {
 635                 talloc_steal(mem_ctx, state);
 636                 talloc_set_destructor(state, smb2_smb2_read_state_deny_destructor);
 637                 tevent_req_received(req);
 638                 state->smb2req->queue_entry.sendfile_header = &state->out_headers;
 639                 talloc_set_destructor(state, smb2_sendfile_send_data);
 640         } else {
 641                 tevent_req_received(req);
 642         }
 643
 644         return NT_STATUS_OK;
 645 }