a7d2496bc6f30e4a7f425fa9fe9a0d53116f1b66
[samba.git] / 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/util/sys_rw_data.h"
30
31 #undef DBGC_CLASS
32 #define DBGC_CLASS DBGC_SMB2
33
34 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
35                                               struct tevent_context *ev,
36                                               struct smbd_smb2_request *smb2req,
37                                               struct files_struct *in_fsp,
38                                               uint8_t in_flags,
39                                               uint32_t in_length,
40                                               uint64_t in_offset,
41                                               uint32_t in_minimum,
42                                               uint32_t in_remaining);
43 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
44                                     TALLOC_CTX *mem_ctx,
45                                     DATA_BLOB *out_data,
46                                     uint32_t *out_remaining);
47
48 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
49 NTSTATUS smbd_smb2_request_process_read(struct smbd_smb2_request *req)
50 {
51         struct smbXsrv_connection *xconn = req->xconn;
52         NTSTATUS status;
53         const uint8_t *inbody;
54         uint8_t in_flags;
55         uint32_t in_length;
56         uint64_t in_offset;
57         uint64_t in_file_id_persistent;
58         uint64_t in_file_id_volatile;
59         struct files_struct *in_fsp;
60         uint32_t in_minimum_count;
61         uint32_t in_remaining_bytes;
62         struct tevent_req *subreq;
63
64         status = smbd_smb2_request_verify_sizes(req, 0x31);
65         if (!NT_STATUS_IS_OK(status)) {
66                 return smbd_smb2_request_error(req, status);
67         }
68         inbody = SMBD_SMB2_IN_BODY_PTR(req);
69
70         if (xconn->protocol >= PROTOCOL_SMB3_02) {
71                 in_flags                = CVAL(inbody, 0x03);
72         } else {
73                 in_flags                = 0;
74         }
75         in_length               = IVAL(inbody, 0x04);
76         in_offset               = BVAL(inbody, 0x08);
77         in_file_id_persistent   = BVAL(inbody, 0x10);
78         in_file_id_volatile     = BVAL(inbody, 0x18);
79         in_minimum_count        = IVAL(inbody, 0x20);
80         in_remaining_bytes      = IVAL(inbody, 0x28);
81
82         /* check the max read size */
83         if (in_length > xconn->smb2.server.max_read) {
84                 DEBUG(2,("smbd_smb2_request_process_read: "
85                          "client ignored max read: %s: 0x%08X: 0x%08X\n",
86                         __location__, in_length, xconn->smb2.server.max_read));
87                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
88         }
89
90         status = smbd_smb2_request_verify_creditcharge(req, in_length);
91         if (!NT_STATUS_IS_OK(status)) {
92                 return smbd_smb2_request_error(req, status);
93         }
94
95         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
96         if (in_fsp == NULL) {
97                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
98         }
99
100         subreq = smbd_smb2_read_send(req, req->sconn->ev_ctx,
101                                      req, in_fsp,
102                                      in_flags,
103                                      in_length,
104                                      in_offset,
105                                      in_minimum_count,
106                                      in_remaining_bytes);
107         if (subreq == NULL) {
108                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
109         }
110         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
111
112         return smbd_smb2_request_pending_queue(req, subreq, 500);
113 }
114
115 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
116 {
117         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
118                                         struct smbd_smb2_request);
119         DATA_BLOB outbody;
120         DATA_BLOB outdyn;
121         uint8_t out_data_offset;
122         DATA_BLOB out_data_buffer = data_blob_null;
123         uint32_t out_data_remaining = 0;
124         NTSTATUS status;
125         NTSTATUS error; /* transport error */
126
127         status = smbd_smb2_read_recv(subreq,
128                                      req,
129                                      &out_data_buffer,
130                                      &out_data_remaining);
131         TALLOC_FREE(subreq);
132         if (!NT_STATUS_IS_OK(status)) {
133                 error = smbd_smb2_request_error(req, status);
134                 if (!NT_STATUS_IS_OK(error)) {
135                         smbd_server_connection_terminate(req->xconn,
136                                                          nt_errstr(error));
137                         return;
138                 }
139                 return;
140         }
141
142         out_data_offset = SMB2_HDR_BODY + 0x10;
143
144         outbody = smbd_smb2_generate_outbody(req, 0x10);
145         if (outbody.data == NULL) {
146                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
147                 if (!NT_STATUS_IS_OK(error)) {
148                         smbd_server_connection_terminate(req->xconn,
149                                                          nt_errstr(error));
150                         return;
151                 }
152                 return;
153         }
154
155         SSVAL(outbody.data, 0x00, 0x10 + 1);    /* struct size */
156         SCVAL(outbody.data, 0x02,
157               out_data_offset);                 /* data offset */
158         SCVAL(outbody.data, 0x03, 0);           /* reserved */
159         SIVAL(outbody.data, 0x04,
160               out_data_buffer.length);          /* data length */
161         SIVAL(outbody.data, 0x08,
162               out_data_remaining);              /* data remaining */
163         SIVAL(outbody.data, 0x0C, 0);           /* reserved */
164
165         outdyn = out_data_buffer;
166
167         error = smbd_smb2_request_done(req, outbody, &outdyn);
168         if (!NT_STATUS_IS_OK(error)) {
169                 smbd_server_connection_terminate(req->xconn,
170                                                  nt_errstr(error));
171                 return;
172         }
173 }
174
175 struct smbd_smb2_read_state {
176         struct smbd_smb2_request *smb2req;
177         struct smb_request *smbreq;
178         files_struct *fsp;
179         uint8_t in_flags;
180         uint32_t in_length;
181         uint64_t in_offset;
182         uint32_t in_minimum;
183         DATA_BLOB out_headers;
184         uint8_t _out_hdr_buf[NBT_HDR_SIZE + SMB2_HDR_BODY + 0x10];
185         DATA_BLOB out_data;
186         uint32_t out_remaining;
187 };
188
189 static int smb2_smb2_read_state_deny_destructor(struct smbd_smb2_read_state *state)
190 {
191         return -1;
192 }
193
194 /* struct smbd_smb2_read_state destructor. Send the SMB2_READ data. */
195 static int smb2_sendfile_send_data(struct smbd_smb2_read_state *state)
196 {
197         struct lock_struct lock;
198         uint32_t in_length = state->in_length;
199         uint64_t in_offset = state->in_offset;
200         files_struct *fsp = state->fsp;
201         const DATA_BLOB *hdr = state->smb2req->queue_entry.sendfile_header;
202         NTSTATUS *pstatus = state->smb2req->queue_entry.sendfile_status;
203         struct smbXsrv_connection *xconn = state->smb2req->xconn;
204         ssize_t nread;
205         ssize_t ret;
206         int saved_errno;
207
208         nread = SMB_VFS_SENDFILE(xconn->transport.sock,
209                                  fsp,
210                                  hdr,
211                                  in_offset,
212                                  in_length);
213         DEBUG(10,("smb2_sendfile_send_data: SMB_VFS_SENDFILE returned %d on file %s\n",
214                 (int)nread,
215                 fsp_str_dbg(fsp) ));
216
217         if (nread == -1) {
218                 saved_errno = errno;
219
220                 /*
221                  * Returning ENOSYS means no data at all was sent.
222                    Do this as a normal read. */
223                 if (errno == ENOSYS) {
224                         goto normal_read;
225                 }
226
227                 if (errno == ENOTSUP) {
228                         set_use_sendfile(SNUM(fsp->conn), false);
229                         DBG_WARNING("Disabling sendfile use as sendfile is "
230                                     "not supported by the system\n");
231                         goto normal_read;
232                 }
233
234                 if (errno == EINTR) {
235                         /*
236                          * Special hack for broken Linux with no working sendfile. If we
237                          * return EINTR we sent the header but not the rest of the data.
238                          * Fake this up by doing read/write calls.
239                          */
240                         set_use_sendfile(SNUM(fsp->conn), false);
241                         nread = fake_sendfile(xconn, fsp, in_offset, in_length);
242                         if (nread == -1) {
243                                 saved_errno = errno;
244                                 DEBUG(0,("smb2_sendfile_send_data: fake_sendfile "
245                                          "failed for file %s (%s) for client %s. "
246                                          "Terminating\n",
247                                          fsp_str_dbg(fsp), strerror(saved_errno),
248                                          smbXsrv_connection_dbg(xconn)));
249                                 *pstatus = map_nt_error_from_unix_common(saved_errno);
250                                 return 0;
251                         }
252                         goto out;
253                 }
254
255                 DEBUG(0,("smb2_sendfile_send_data: sendfile failed for file "
256                          "%s (%s) for client %s. Terminating\n",
257                          fsp_str_dbg(fsp), strerror(saved_errno),
258                          smbXsrv_connection_dbg(xconn)));
259                 *pstatus = map_nt_error_from_unix_common(saved_errno);
260                 return 0;
261         } else if (nread == 0) {
262                 /*
263                  * Some sendfile implementations return 0 to indicate
264                  * that there was a short read, but nothing was
265                  * actually written to the socket.  In this case,
266                  * fallback to the normal read path so the header gets
267                  * the correct byte count.
268                  */
269                 DEBUG(3, ("send_file_readX: sendfile sent zero bytes "
270                         "falling back to the normal read: %s\n",
271                         fsp_str_dbg(fsp)));
272                 goto normal_read;
273         }
274
275         /*
276          * We got a short read
277          */
278         goto out;
279
280 normal_read:
281         /* Send out the header. */
282         ret = write_data(xconn->transport.sock,
283                          (const char *)hdr->data, hdr->length);
284         if (ret != hdr->length) {
285                 saved_errno = errno;
286                 DEBUG(0,("smb2_sendfile_send_data: write_data failed for file "
287                          "%s (%s) for client %s. Terminating\n",
288                          fsp_str_dbg(fsp), strerror(saved_errno),
289                          smbXsrv_connection_dbg(xconn)));
290                 *pstatus = map_nt_error_from_unix_common(saved_errno);
291                 return 0;
292         }
293         nread = fake_sendfile(xconn, fsp, in_offset, in_length);
294         if (nread == -1) {
295                 saved_errno = errno;
296                 DEBUG(0,("smb2_sendfile_send_data: fake_sendfile "
297                          "failed for file %s (%s) for client %s. "
298                          "Terminating\n",
299                          fsp_str_dbg(fsp), strerror(saved_errno),
300                          smbXsrv_connection_dbg(xconn)));
301                 *pstatus = map_nt_error_from_unix_common(saved_errno);
302                 return 0;
303         }
304
305   out:
306
307         if (nread < in_length) {
308                 ret = sendfile_short_send(xconn, fsp, nread,
309                                           hdr->length, in_length);
310                 if (ret == -1) {
311                         saved_errno = errno;
312                         DEBUG(0,("%s: sendfile_short_send "
313                                  "failed for file %s (%s) for client %s. "
314                                  "Terminating\n",
315                                  __func__,
316                                  fsp_str_dbg(fsp), strerror(saved_errno),
317                                  smbXsrv_connection_dbg(xconn)));
318                         *pstatus = map_nt_error_from_unix_common(saved_errno);
319                         return 0;
320                 }
321         }
322
323         init_strict_lock_struct(fsp,
324                                 fsp->op->global->open_persistent_id,
325                                 in_offset,
326                                 in_length,
327                                 READ_LOCK,
328                                 &lock);
329
330         *pstatus = NT_STATUS_OK;
331         return 0;
332 }
333
334 static NTSTATUS schedule_smb2_sendfile_read(struct smbd_smb2_request *smb2req,
335                                         struct smbd_smb2_read_state *state)
336 {
337         files_struct *fsp = state->fsp;
338
339         /*
340          * We cannot use sendfile if...
341          * We were not configured to do so OR
342          * Signing is active OR
343          * This is a compound SMB2 operation OR
344          * fsp is a STREAM file OR
345          * We're using a write cache OR
346          * It's not a regular file OR
347          * Requested offset is greater than file size OR
348          * there's not enough data in the file.
349          * Phew :-). Luckily this means most
350          * reads on most normal files. JRA.
351         */
352
353         if (!lp__use_sendfile(SNUM(fsp->conn)) ||
354             smb2req->do_signing ||
355             smb2req->do_encryption ||
356             smbd_smb2_is_compound(smb2req) ||
357             (fsp->base_fsp != NULL) ||
358             (fsp->wcp != NULL) ||
359             (!S_ISREG(fsp->fsp_name->st.st_ex_mode)) ||
360             (state->in_offset >= fsp->fsp_name->st.st_ex_size) ||
361             (fsp->fsp_name->st.st_ex_size < state->in_offset + state->in_length))
362         {
363                 return NT_STATUS_RETRY;
364         }
365
366         /* We've already checked there's this amount of data
367            to read. */
368         state->out_data.length = state->in_length;
369         state->out_remaining = 0;
370
371         state->out_headers = data_blob_const(state->_out_hdr_buf,
372                                              sizeof(state->_out_hdr_buf));
373         return NT_STATUS_OK;
374 }
375
376 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq);
377
378 /*******************************************************************
379  Common read complete processing function for both synchronous and
380  asynchronous reads.
381 *******************************************************************/
382
383 NTSTATUS smb2_read_complete(struct tevent_req *req, ssize_t nread, int err)
384 {
385         struct smbd_smb2_read_state *state = tevent_req_data(req,
386                                         struct smbd_smb2_read_state);
387         files_struct *fsp = state->fsp;
388
389         if (nread < 0) {
390                 NTSTATUS status = map_nt_error_from_unix(err);
391
392                 DEBUG( 3,( "smb2_read_complete: file %s nread = %d. "
393                         "Error = %s (NTSTATUS %s)\n",
394                         fsp_str_dbg(fsp),
395                         (int)nread,
396                         strerror(err),
397                         nt_errstr(status)));
398
399                 return status;
400         }
401         if (nread == 0 && state->in_length != 0) {
402                 DEBUG(5,("smb2_read_complete: read_file[%s] end of file\n",
403                         fsp_str_dbg(fsp)));
404                 return NT_STATUS_END_OF_FILE;
405         }
406
407         if (nread < state->in_minimum) {
408                 DEBUG(5,("smb2_read_complete: read_file[%s] read less %d than "
409                         "minimum requested %u. Returning end of file\n",
410                         fsp_str_dbg(fsp),
411                         (int)nread,
412                         (unsigned int)state->in_minimum));
413                 return NT_STATUS_END_OF_FILE;
414         }
415
416         DEBUG(3,("smbd_smb2_read: %s, file %s, length=%lu offset=%lu read=%lu\n",
417                 fsp_fnum_dbg(fsp),
418                 fsp_str_dbg(fsp),
419                 (unsigned long)state->in_length,
420                 (unsigned long)state->in_offset,
421                 (unsigned long)nread));
422
423         state->out_data.length = nread;
424         state->out_remaining = 0;
425
426         return NT_STATUS_OK;
427 }
428
429 static bool smbd_smb2_read_cancel(struct tevent_req *req)
430 {
431         struct smbd_smb2_read_state *state =
432                 tevent_req_data(req,
433                 struct smbd_smb2_read_state);
434
435         return cancel_smb2_aio(state->smbreq);
436 }
437
438 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
439                                               struct tevent_context *ev,
440                                               struct smbd_smb2_request *smb2req,
441                                               struct files_struct *fsp,
442                                               uint8_t in_flags,
443                                               uint32_t in_length,
444                                               uint64_t in_offset,
445                                               uint32_t in_minimum,
446                                               uint32_t in_remaining)
447 {
448         NTSTATUS status;
449         struct tevent_req *req = NULL;
450         struct smbd_smb2_read_state *state = NULL;
451         struct smb_request *smbreq = NULL;
452         connection_struct *conn = smb2req->tcon->compat;
453         ssize_t nread = -1;
454         struct lock_struct lock;
455         int saved_errno;
456
457         req = tevent_req_create(mem_ctx, &state,
458                                 struct smbd_smb2_read_state);
459         if (req == NULL) {
460                 return NULL;
461         }
462         state->smb2req = smb2req;
463         state->in_flags = in_flags;
464         state->in_length = in_length;
465         state->in_offset = in_offset;
466         state->in_minimum = in_minimum;
467         state->out_data = data_blob_null;
468         state->out_remaining = 0;
469
470         DEBUG(10,("smbd_smb2_read: %s - %s\n",
471                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
472
473         smbreq = smbd_smb2_fake_smb_request(smb2req);
474         if (tevent_req_nomem(smbreq, req)) {
475                 return tevent_req_post(req, ev);
476         }
477         state->smbreq = smbreq;
478
479         if (fsp->is_directory) {
480                 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
481                 return tevent_req_post(req, ev);
482         }
483
484         state->fsp = fsp;
485
486         if (IS_IPC(smbreq->conn)) {
487                 struct tevent_req *subreq = NULL;
488
489                 state->out_data = data_blob_talloc(state, NULL, in_length);
490                 if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
491                         return tevent_req_post(req, ev);
492                 }
493
494                 if (!fsp_is_np(fsp)) {
495                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
496                         return tevent_req_post(req, ev);
497                 }
498
499                 subreq = np_read_send(state, ev,
500                                       fsp->fake_file_handle,
501                                       state->out_data.data,
502                                       state->out_data.length);
503                 if (tevent_req_nomem(subreq, req)) {
504                         return tevent_req_post(req, ev);
505                 }
506                 tevent_req_set_callback(subreq,
507                                         smbd_smb2_read_pipe_done,
508                                         req);
509                 return req;
510         }
511
512         if (!CHECK_READ_SMB2(fsp)) {
513                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
514                 return tevent_req_post(req, ev);
515         }
516
517         status = schedule_smb2_aio_read(fsp->conn,
518                                 smbreq,
519                                 fsp,
520                                 state,
521                                 &state->out_data,
522                                 (off_t)in_offset,
523                                 (size_t)in_length);
524
525         if (NT_STATUS_IS_OK(status)) {
526                 /*
527                  * Doing an async read, allow this
528                  * request to be canceled
529                  */
530                 tevent_req_set_cancel_fn(req, smbd_smb2_read_cancel);
531                 return req;
532         }
533
534         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
535                 /* Real error in setting up aio. Fail. */
536                 tevent_req_nterror(req, status);
537                 return tevent_req_post(req, ev);
538         }
539
540         /* Fallback to synchronous. */
541
542         init_strict_lock_struct(fsp,
543                                 fsp->op->global->open_persistent_id,
544                                 in_offset,
545                                 in_length,
546                                 READ_LOCK,
547                                 &lock);
548
549         if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &lock)) {
550                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
551                 return tevent_req_post(req, ev);
552         }
553
554         /* Try sendfile in preference. */
555         status = schedule_smb2_sendfile_read(smb2req, state);
556         if (NT_STATUS_IS_OK(status)) {
557                 tevent_req_done(req);
558                 return tevent_req_post(req, ev);
559         } else {
560                 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
561                         tevent_req_nterror(req, status);
562                         return tevent_req_post(req, ev);
563                 }
564         }
565
566         /* Ok, read into memory. Allocate the out buffer. */
567         state->out_data = data_blob_talloc(state, NULL, in_length);
568         if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
569                 return tevent_req_post(req, ev);
570         }
571
572         nread = read_file(fsp,
573                           (char *)state->out_data.data,
574                           in_offset,
575                           in_length);
576
577         saved_errno = errno;
578
579         DEBUG(10,("smbd_smb2_read: file %s, %s, offset=%llu "
580                 "len=%llu returned %lld\n",
581                 fsp_str_dbg(fsp),
582                 fsp_fnum_dbg(fsp),
583                 (unsigned long long)in_offset,
584                 (unsigned long long)in_length,
585                 (long long)nread));
586
587         status = smb2_read_complete(req, nread, saved_errno);
588         if (!NT_STATUS_IS_OK(status)) {
589                 tevent_req_nterror(req, status);
590         } else {
591                 /* Success. */
592                 tevent_req_done(req);
593         }
594         return tevent_req_post(req, ev);
595 }
596
597 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq)
598 {
599         struct tevent_req *req = tevent_req_callback_data(subreq,
600                                  struct tevent_req);
601         struct smbd_smb2_read_state *state = tevent_req_data(req,
602                                              struct smbd_smb2_read_state);
603         NTSTATUS status;
604         ssize_t nread = -1;
605         bool is_data_outstanding;
606
607         status = np_read_recv(subreq, &nread, &is_data_outstanding);
608         TALLOC_FREE(subreq);
609         if (!NT_STATUS_IS_OK(status)) {
610                 NTSTATUS old = status;
611                 status = nt_status_np_pipe(old);
612                 tevent_req_nterror(req, status);
613                 return;
614         }
615
616         if (nread == 0 && state->out_data.length != 0) {
617                 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
618                 return;
619         }
620
621         state->out_data.length = nread;
622         state->out_remaining = 0;
623
624         /*
625          * TODO: add STATUS_BUFFER_OVERFLOW handling, once we also
626          * handle it in SMB1 pipe_read_andx_done().
627          */
628
629         tevent_req_done(req);
630 }
631
632 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
633                                     TALLOC_CTX *mem_ctx,
634                                     DATA_BLOB *out_data,
635                                     uint32_t *out_remaining)
636 {
637         NTSTATUS status;
638         struct smbd_smb2_read_state *state = tevent_req_data(req,
639                                              struct smbd_smb2_read_state);
640
641         if (tevent_req_is_nterror(req, &status)) {
642                 tevent_req_received(req);
643                 return status;
644         }
645
646         *out_data = state->out_data;
647         talloc_steal(mem_ctx, out_data->data);
648         *out_remaining = state->out_remaining;
649
650         if (state->out_headers.length > 0) {
651                 talloc_steal(mem_ctx, state);
652                 talloc_set_destructor(state, smb2_smb2_read_state_deny_destructor);
653                 tevent_req_received(req);
654                 state->smb2req->queue_entry.sendfile_header = &state->out_headers;
655                 talloc_set_destructor(state, smb2_sendfile_send_data);
656         } else {
657                 tevent_req_received(req);
658         }
659
660         return NT_STATUS_OK;
661 }