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 #include "lib/sys_rw_data.h"
  30
  31 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
  32                                               struct tevent_context *ev,
  33                                               struct smbd_smb2_request *smb2req,
  34                                               struct files_struct *in_fsp,
  35                                               uint32_t in_length,
  36                                               uint64_t in_offset,
  37                                               uint32_t in_minimum,
  38                                               uint32_t in_remaining);
  39 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
  40                                     TALLOC_CTX *mem_ctx,
  41                                     DATA_BLOB *out_data,
  42                                     uint32_t *out_remaining);
  43
  44 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
  45 NTSTATUS smbd_smb2_request_process_read(struct smbd_smb2_request *req)
  46 {
  47         struct smbXsrv_connection *xconn = req->xconn;
  48         NTSTATUS status;
  49         const uint8_t *inbody;
  50         uint32_t in_length;
  51         uint64_t in_offset;
  52         uint64_t in_file_id_persistent;
  53         uint64_t in_file_id_volatile;
  54         struct files_struct *in_fsp;
  55         uint32_t in_minimum_count;
  56         uint32_t in_remaining_bytes;
  57         struct tevent_req *subreq;
  58
  59         status = smbd_smb2_request_verify_sizes(req, 0x31);
  60         if (!NT_STATUS_IS_OK(status)) {
  61                 return smbd_smb2_request_error(req, status);
  62         }
  63         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  64
  65         in_length               = IVAL(inbody, 0x04);
  66         in_offset               = BVAL(inbody, 0x08);
  67         in_file_id_persistent   = BVAL(inbody, 0x10);
  68         in_file_id_volatile     = BVAL(inbody, 0x18);
  69         in_minimum_count        = IVAL(inbody, 0x20);
  70         in_remaining_bytes      = IVAL(inbody, 0x28);
  71
  72         /* check the max read size */
  73         if (in_length > xconn->smb2.server.max_read) {
  74                 DEBUG(2,("smbd_smb2_request_process_read: "
  75                          "client ignored max read: %s: 0x%08X: 0x%08X\n",
  76                         __location__, in_length, xconn->smb2.server.max_read));
  77                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  78         }
  79
  80         status = smbd_smb2_request_verify_creditcharge(req, in_length);
  81         if (!NT_STATUS_IS_OK(status)) {
  82                 return smbd_smb2_request_error(req, status);
  83         }
  84
  85         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  86         if (in_fsp == NULL) {
  87                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  88         }
  89
  90         subreq = smbd_smb2_read_send(req, req->sconn->ev_ctx,
  91                                      req, in_fsp,
  92                                      in_length,
  93                                      in_offset,
  94                                      in_minimum_count,
  95                                      in_remaining_bytes);
  96         if (subreq == NULL) {
  97                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  98         }
  99         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
 100
 101         return smbd_smb2_request_pending_queue(req, subreq, 500);
 102 }
 103
 104 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
 105 {
 106         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 107                                         struct smbd_smb2_request);
 108         DATA_BLOB outbody;
 109         DATA_BLOB outdyn;
 110         uint8_t out_data_offset;
 111         DATA_BLOB out_data_buffer = data_blob_null;
 112         uint32_t out_data_remaining = 0;
 113         NTSTATUS status;
 114         NTSTATUS error; /* transport error */
 115
 116         status = smbd_smb2_read_recv(subreq,
 117                                      req,
 118                                      &out_data_buffer,
 119                                      &out_data_remaining);
 120         TALLOC_FREE(subreq);
 121         if (!NT_STATUS_IS_OK(status)) {
 122                 error = smbd_smb2_request_error(req, status);
 123                 if (!NT_STATUS_IS_OK(error)) {
 124                         smbd_server_connection_terminate(req->xconn,
 125                                                          nt_errstr(error));
 126                         return;
 127                 }
 128                 return;
 129         }
 130
 131         out_data_offset = SMB2_HDR_BODY + 0x10;
 132
 133         outbody = smbd_smb2_generate_outbody(req, 0x10);
 134         if (outbody.data == NULL) {
 135                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 136                 if (!NT_STATUS_IS_OK(error)) {
 137                         smbd_server_connection_terminate(req->xconn,
 138                                                          nt_errstr(error));
 139                         return;
 140                 }
 141                 return;
 142         }
 143
 144         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
 145         SCVAL(outbody.data, 0x02,
 146               out_data_offset);                 /* data offset */
 147         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 148         SIVAL(outbody.data, 0x04,
 149               out_data_buffer.length);          /* data length */
 150         SIVAL(outbody.data, 0x08,
 151               out_data_remaining);              /* data remaining */
 152         SIVAL(outbody.data, 0x0C, 0);           /* reserved */
 153
 154         outdyn = out_data_buffer;
 155
 156         error = smbd_smb2_request_done(req, outbody, &outdyn);
 157         if (!NT_STATUS_IS_OK(error)) {
 158                 smbd_server_connection_terminate(req->xconn,
 159                                                  nt_errstr(error));
 160                 return;
 161         }
 162 }
 163
 164 struct smbd_smb2_read_state {
 165         struct smbd_smb2_request *smb2req;
 166         struct smb_request *smbreq;
 167         files_struct *fsp;
 168         uint32_t in_length;
 169         uint64_t in_offset;
 170         uint32_t in_minimum;
 171         DATA_BLOB out_headers;
 172         uint8_t _out_hdr_buf[NBT_HDR_SIZE + SMB2_HDR_BODY + 0x10];
 173         DATA_BLOB out_data;
 174         uint32_t out_remaining;
 175 };
 176
 177 static int smb2_smb2_read_state_deny_destructor(struct smbd_smb2_read_state *state)
 178 {
 179         return -1;
 180 }
 181
 182 /* struct smbd_smb2_read_state destructor. Send the SMB2_READ data. */
 183 static int smb2_sendfile_send_data(struct smbd_smb2_read_state *state)
 184 {
 185         struct lock_struct lock;
 186         uint32_t in_length = state->in_length;
 187         uint64_t in_offset = state->in_offset;
 188         files_struct *fsp = state->fsp;
 189         const DATA_BLOB *hdr = state->smb2req->queue_entry.sendfile_header;
 190         NTSTATUS *pstatus = state->smb2req->queue_entry.sendfile_status;
 191         struct smbXsrv_connection *xconn = state->smb2req->xconn;
 192         ssize_t nread;
 193         ssize_t ret;
 194         int saved_errno;
 195
 196         nread = SMB_VFS_SENDFILE(xconn->transport.sock,
 197                                  fsp,
 198                                  hdr,
 199                                  in_offset,
 200                                  in_length);
 201         DEBUG(10,("smb2_sendfile_send_data: SMB_VFS_SENDFILE returned %d on file %s\n",
 202                 (int)nread,
 203                 fsp_str_dbg(fsp) ));
 204
 205         if (nread == -1) {
 206                 saved_errno = errno;
 207
 208                 /*
 209                  * Returning ENOSYS means no data at all was sent.
 210                    Do this as a normal read. */
 211                 if (errno == ENOSYS) {
 212                         goto normal_read;
 213                 }
 214
 215                 if (errno == EINTR) {
 216                         /*
 217                          * Special hack for broken Linux with no working sendfile. If we
 218                          * return EINTR we sent the header but not the rest of the data.
 219                          * Fake this up by doing read/write calls.
 220                          */
 221                         set_use_sendfile(SNUM(fsp->conn), false);
 222                         nread = fake_sendfile(xconn, fsp, in_offset, in_length);
 223                         if (nread == -1) {
 224                                 saved_errno = errno;
 225                                 DEBUG(0,("smb2_sendfile_send_data: fake_sendfile "
 226                                          "failed for file %s (%s) for client %s. "
 227                                          "Terminating\n",
 228                                          fsp_str_dbg(fsp), strerror(saved_errno),
 229                                          smbXsrv_connection_dbg(xconn)));
 230                                 *pstatus = map_nt_error_from_unix_common(saved_errno);
 231                                 return 0;
 232                         }
 233                         goto out;
 234                 }
 235
 236                 DEBUG(0,("smb2_sendfile_send_data: sendfile failed for file "
 237                          "%s (%s) for client %s. Terminating\n",
 238                          fsp_str_dbg(fsp), strerror(saved_errno),
 239                          smbXsrv_connection_dbg(xconn)));
 240                 *pstatus = map_nt_error_from_unix_common(saved_errno);
 241                 return 0;
 242         } else if (nread == 0) {
 243                 /*
 244                  * Some sendfile implementations return 0 to indicate
 245                  * that there was a short read, but nothing was
 246                  * actually written to the socket.  In this case,
 247                  * fallback to the normal read path so the header gets
 248                  * the correct byte count.
 249                  */
 250                 DEBUG(3, ("send_file_readX: sendfile sent zero bytes "
 251                         "falling back to the normal read: %s\n",
 252                         fsp_str_dbg(fsp)));
 253                 goto normal_read;
 254         }
 255
 256         /*
 257          * We got a short read
 258          */
 259         goto out;
 260
 261 normal_read:
 262         /* Send out the header. */
 263         ret = write_data(xconn->transport.sock,
 264                          (const char *)hdr->data, hdr->length);
 265         if (ret != hdr->length) {
 266                 saved_errno = errno;
 267                 DEBUG(0,("smb2_sendfile_send_data: write_data failed for file "
 268                          "%s (%s) for client %s. Terminating\n",
 269                          fsp_str_dbg(fsp), strerror(saved_errno),
 270                          smbXsrv_connection_dbg(xconn)));
 271                 *pstatus = map_nt_error_from_unix_common(saved_errno);
 272                 return 0;
 273         }
 274         nread = fake_sendfile(xconn, fsp, in_offset, in_length);
 275         if (nread == -1) {
 276                 saved_errno = errno;
 277                 DEBUG(0,("smb2_sendfile_send_data: fake_sendfile "
 278                          "failed for file %s (%s) for client %s. "
 279                          "Terminating\n",
 280                          fsp_str_dbg(fsp), strerror(saved_errno),
 281                          smbXsrv_connection_dbg(xconn)));
 282                 *pstatus = map_nt_error_from_unix_common(saved_errno);
 283                 return 0;
 284         }
 285
 286   out:
 287
 288         if (nread < in_length) {
 289                 ret = sendfile_short_send(xconn, fsp, nread,
 290                                           hdr->length, in_length);
 291                 if (ret == -1) {
 292                         saved_errno = errno;
 293                         DEBUG(0,("%s: sendfile_short_send "
 294                                  "failed for file %s (%s) for client %s. "
 295                                  "Terminating\n",
 296                                  __func__,
 297                                  fsp_str_dbg(fsp), strerror(saved_errno),
 298                                  smbXsrv_connection_dbg(xconn)));
 299                         *pstatus = map_nt_error_from_unix_common(saved_errno);
 300                         return 0;
 301                 }
 302         }
 303
 304         init_strict_lock_struct(fsp,
 305                                 fsp->op->global->open_persistent_id,
 306                                 in_offset,
 307                                 in_length,
 308                                 READ_LOCK,
 309                                 &lock);
 310
 311         SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lock);
 312
 313         *pstatus = NT_STATUS_OK;
 314         return 0;
 315 }
 316
 317 static NTSTATUS schedule_smb2_sendfile_read(struct smbd_smb2_request *smb2req,
 318                                         struct smbd_smb2_read_state *state)
 319 {
 320         files_struct *fsp = state->fsp;
 321
 322         /*
 323          * We cannot use sendfile if...
 324          * We were not configured to do so OR
 325          * Signing is active OR
 326          * This is a compound SMB2 operation OR
 327          * fsp is a STREAM file OR
 328          * We're using a write cache OR
 329          * It's not a regular file OR
 330          * Requested offset is greater than file size OR
 331          * there's not enough data in the file.
 332          * Phew :-). Luckily this means most
 333          * reads on most normal files. JRA.
 334         */
 335
 336         if (!lp__use_sendfile(SNUM(fsp->conn)) ||
 337             smb2req->do_signing ||
 338             smb2req->do_encryption ||
 339             smb2req->in.vector_count >= (2*SMBD_SMB2_NUM_IOV_PER_REQ) ||
 340             (fsp->base_fsp != NULL) ||
 341             (fsp->wcp != NULL) ||
 342             (!S_ISREG(fsp->fsp_name->st.st_ex_mode)) ||
 343             (state->in_offset >= fsp->fsp_name->st.st_ex_size) ||
 344             (fsp->fsp_name->st.st_ex_size < state->in_offset + state->in_length))
 345         {
 346                 return NT_STATUS_RETRY;
 347         }
 348
 349         /* We've already checked there's this amount of data
 350            to read. */
 351         state->out_data.length = state->in_length;
 352         state->out_remaining = 0;
 353
 354         state->out_headers = data_blob_const(state->_out_hdr_buf,
 355                                              sizeof(state->_out_hdr_buf));
 356         return NT_STATUS_OK;
 357 }
 358
 359 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq);
 360
 361 /*******************************************************************
 362  Common read complete processing function for both synchronous and
 363  asynchronous reads.
 364 *******************************************************************/
 365
 366 NTSTATUS smb2_read_complete(struct tevent_req *req, ssize_t nread, int err)
 367 {
 368         struct smbd_smb2_read_state *state = tevent_req_data(req,
 369                                         struct smbd_smb2_read_state);
 370         files_struct *fsp = state->fsp;
 371
 372         if (nread < 0) {
 373                 NTSTATUS status = map_nt_error_from_unix(err);
 374
 375                 DEBUG( 3,( "smb2_read_complete: file %s nread = %d. "
 376                         "Error = %s (NTSTATUS %s)\n",
 377                         fsp_str_dbg(fsp),
 378                         (int)nread,
 379                         strerror(err),
 380                         nt_errstr(status)));
 381
 382                 return status;
 383         }
 384         if (nread == 0 && state->in_length != 0) {
 385                 DEBUG(5,("smb2_read_complete: read_file[%s] end of file\n",
 386                         fsp_str_dbg(fsp)));
 387                 return NT_STATUS_END_OF_FILE;
 388         }
 389
 390         if (nread < state->in_minimum) {
 391                 DEBUG(5,("smb2_read_complete: read_file[%s] read less %d than "
 392                         "minimum requested %u. Returning end of file\n",
 393                         fsp_str_dbg(fsp),
 394                         (int)nread,
 395                         (unsigned int)state->in_minimum));
 396                 return NT_STATUS_END_OF_FILE;
 397         }
 398
 399         DEBUG(3,("smbd_smb2_read: %s, file %s, length=%lu offset=%lu read=%lu\n",
 400                 fsp_fnum_dbg(fsp),
 401                 fsp_str_dbg(fsp),
 402                 (unsigned long)state->in_length,
 403                 (unsigned long)state->in_offset,
 404                 (unsigned long)nread));
 405
 406         state->out_data.length = nread;
 407         state->out_remaining = 0;
 408
 409         return NT_STATUS_OK;
 410 }
 411
 412 static bool smbd_smb2_read_cancel(struct tevent_req *req)
 413 {
 414         struct smbd_smb2_read_state *state =
 415                 tevent_req_data(req,
 416                 struct smbd_smb2_read_state);
 417
 418         return cancel_smb2_aio(state->smbreq);
 419 }
 420
 421 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
 422                                               struct tevent_context *ev,
 423                                               struct smbd_smb2_request *smb2req,
 424                                               struct files_struct *fsp,
 425                                               uint32_t in_length,
 426                                               uint64_t in_offset,
 427                                               uint32_t in_minimum,
 428                                               uint32_t in_remaining)
 429 {
 430         NTSTATUS status;
 431         struct tevent_req *req = NULL;
 432         struct smbd_smb2_read_state *state = NULL;
 433         struct smb_request *smbreq = NULL;
 434         connection_struct *conn = smb2req->tcon->compat;
 435         ssize_t nread = -1;
 436         struct lock_struct lock;
 437         int saved_errno;
 438
 439         req = tevent_req_create(mem_ctx, &state,
 440                                 struct smbd_smb2_read_state);
 441         if (req == NULL) {
 442                 return NULL;
 443         }
 444         state->smb2req = smb2req;
 445         state->in_length = in_length;
 446         state->in_offset = in_offset;
 447         state->in_minimum = in_minimum;
 448         state->out_data = data_blob_null;
 449         state->out_remaining = 0;
 450
 451         DEBUG(10,("smbd_smb2_read: %s - %s\n",
 452                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 453
 454         smbreq = smbd_smb2_fake_smb_request(smb2req);
 455         if (tevent_req_nomem(smbreq, req)) {
 456                 return tevent_req_post(req, ev);
 457         }
 458         state->smbreq = smbreq;
 459
 460         if (fsp->is_directory) {
 461                 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 462                 return tevent_req_post(req, ev);
 463         }
 464
 465         state->fsp = fsp;
 466
 467         if (IS_IPC(smbreq->conn)) {
 468                 struct tevent_req *subreq = NULL;
 469
 470                 state->out_data = data_blob_talloc(state, NULL, in_length);
 471                 if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
 472                         return tevent_req_post(req, ev);
 473                 }
 474
 475                 if (!fsp_is_np(fsp)) {
 476                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 477                         return tevent_req_post(req, ev);
 478                 }
 479
 480                 subreq = np_read_send(state, ev,
 481                                       fsp->fake_file_handle,
 482                                       state->out_data.data,
 483                                       state->out_data.length);
 484                 if (tevent_req_nomem(subreq, req)) {
 485                         return tevent_req_post(req, ev);
 486                 }
 487                 tevent_req_set_callback(subreq,
 488                                         smbd_smb2_read_pipe_done,
 489                                         req);
 490                 return req;
 491         }
 492
 493         if (!CHECK_READ(fsp, smbreq)) {
 494                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 495                 return tevent_req_post(req, ev);
 496         }
 497
 498         status = schedule_smb2_aio_read(fsp->conn,
 499                                 smbreq,
 500                                 fsp,
 501                                 state,
 502                                 &state->out_data,
 503                                 (off_t)in_offset,
 504                                 (size_t)in_length);
 505
 506         if (NT_STATUS_IS_OK(status)) {
 507                 /*
 508                  * Doing an async read, allow this
 509                  * request to be canceled
 510                  */
 511                 tevent_req_set_cancel_fn(req, smbd_smb2_read_cancel);
 512                 return req;
 513         }
 514
 515         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 516                 /* Real error in setting up aio. Fail. */
 517                 tevent_req_nterror(req, status);
 518                 return tevent_req_post(req, ev);
 519         }
 520
 521         /* Fallback to synchronous. */
 522
 523         init_strict_lock_struct(fsp,
 524                                 fsp->op->global->open_persistent_id,
 525                                 in_offset,
 526                                 in_length,
 527                                 READ_LOCK,
 528                                 &lock);
 529
 530         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 531                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 532                 return tevent_req_post(req, ev);
 533         }
 534
 535         /* Try sendfile in preference. */
 536         status = schedule_smb2_sendfile_read(smb2req, state);
 537         if (NT_STATUS_IS_OK(status)) {
 538                 tevent_req_done(req);
 539                 return tevent_req_post(req, ev);
 540         } else {
 541                 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 542                         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 543                         tevent_req_nterror(req, status);
 544                         return tevent_req_post(req, ev);
 545                 }
 546         }
 547
 548         /* Ok, read into memory. Allocate the out buffer. */
 549         state->out_data = data_blob_talloc(state, NULL, in_length);
 550         if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
 551                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 552                 return tevent_req_post(req, ev);
 553         }
 554
 555         nread = read_file(fsp,
 556                           (char *)state->out_data.data,
 557                           in_offset,
 558                           in_length);
 559
 560         saved_errno = errno;
 561
 562         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 563
 564         DEBUG(10,("smbd_smb2_read: file %s, %s, offset=%llu "
 565                 "len=%llu returned %lld\n",
 566                 fsp_str_dbg(fsp),
 567                 fsp_fnum_dbg(fsp),
 568                 (unsigned long long)in_offset,
 569                 (unsigned long long)in_length,
 570                 (long long)nread));
 571
 572         status = smb2_read_complete(req, nread, saved_errno);
 573         if (!NT_STATUS_IS_OK(status)) {
 574                 tevent_req_nterror(req, status);
 575         } else {
 576                 /* Success. */
 577                 tevent_req_done(req);
 578         }
 579         return tevent_req_post(req, ev);
 580 }
 581
 582 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq)
 583 {
 584         struct tevent_req *req = tevent_req_callback_data(subreq,
 585                                  struct tevent_req);
 586         struct smbd_smb2_read_state *state = tevent_req_data(req,
 587                                              struct smbd_smb2_read_state);
 588         NTSTATUS status;
 589         ssize_t nread = -1;
 590         bool is_data_outstanding;
 591
 592         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 593         TALLOC_FREE(subreq);
 594         if (!NT_STATUS_IS_OK(status)) {
 595                 NTSTATUS old = status;
 596                 status = nt_status_np_pipe(old);
 597                 tevent_req_nterror(req, status);
 598                 return;
 599         }
 600
 601         if (nread == 0 && state->out_data.length != 0) {
 602                 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
 603                 return;
 604         }
 605
 606         state->out_data.length = nread;
 607         state->out_remaining = 0;
 608
 609         /*
 610          * TODO: add STATUS_BUFFER_OVERFLOW handling, once we also
 611          * handle it in SMB1 pipe_read_andx_done().
 612          */
 613
 614         tevent_req_done(req);
 615 }
 616
 617 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
 618                                     TALLOC_CTX *mem_ctx,
 619                                     DATA_BLOB *out_data,
 620                                     uint32_t *out_remaining)
 621 {
 622         NTSTATUS status;
 623         struct smbd_smb2_read_state *state = tevent_req_data(req,
 624                                              struct smbd_smb2_read_state);
 625
 626         if (tevent_req_is_nterror(req, &status)) {
 627                 tevent_req_received(req);
 628                 return status;
 629         }
 630
 631         *out_data = state->out_data;
 632         talloc_steal(mem_ctx, out_data->data);
 633         *out_remaining = state->out_remaining;
 634
 635         if (state->out_headers.length > 0) {
 636                 talloc_steal(mem_ctx, state);
 637                 talloc_set_destructor(state, smb2_smb2_read_state_deny_destructor);
 638                 tevent_req_received(req);
 639                 state->smb2req->queue_entry.sendfile_header = &state->out_headers;
 640                 talloc_set_destructor(state, smb2_sendfile_send_data);
 641         } else {
 642                 tevent_req_received(req);
 643         }
 644
 645         return NT_STATUS_OK;
 646 }