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 = data_blob_talloc(req->out.vector, NULL, 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         DATA_BLOB out_data;
 171         uint32_t out_remaining;
 172 };
 173
 174 /* struct smbd_smb2_read_state destructor. Send the SMB2_READ data. */
 175 static int smb2_sendfile_send_data(struct smbd_smb2_read_state *state)
 176 {
 177         struct lock_struct lock;
 178         uint32_t in_length = state->in_length;
 179         uint64_t in_offset = state->in_offset;
 180         files_struct *fsp = state->fsp;
 181         const DATA_BLOB *hdr = state->smb2req->queue_entry.sendfile_header;
 182         ssize_t nread;
 183         ssize_t ret;
 184
 185         nread = SMB_VFS_SENDFILE(fsp->conn->sconn->sock,
 186                                  fsp,
 187                                  hdr,
 188                                  in_offset,
 189                                  in_length);
 190         DEBUG(10,("smb2_sendfile_send_data: SMB_VFS_SENDFILE returned %d on file %s\n",
 191                 (int)nread,
 192                 fsp_str_dbg(fsp) ));
 193
 194         if (nread == -1) {
 195                 /*
 196                  * Returning ENOSYS means no data at all was sent.
 197                    Do this as a normal read. */
 198                 if (errno == ENOSYS) {
 199                         goto normal_read;
 200                 }
 201
 202                 if (errno == EINTR) {
 203                         /*
 204                          * Special hack for broken Linux with no working sendfile. If we
 205                          * return EINTR we sent the header but not the rest of the data.
 206                          * Fake this up by doing read/write calls.
 207                          */
 208                         set_use_sendfile(SNUM(fsp->conn), false);
 209                         nread = fake_sendfile(fsp, in_offset, in_length);
 210                         if (nread == -1) {
 211                                 DEBUG(0,("smb2_sendfile_send_data: "
 212                                         "fake_sendfile failed for "
 213                                         "file %s (%s).\n",
 214                                         fsp_str_dbg(fsp),
 215                                         strerror(errno)));
 216                                 exit_server_cleanly("smb2_sendfile_send_data: "
 217                                         "fake_sendfile failed");
 218                         }
 219                         goto out;
 220                 }
 221
 222                 DEBUG(0,("smb2_sendfile_send_data: sendfile failed for file "
 223                         "%s (%s). Terminating\n",
 224                         fsp_str_dbg(fsp),
 225                         strerror(errno)));
 226                 exit_server_cleanly("smb2_sendfile_send_data: sendfile failed");
 227         } else if (nread == 0) {
 228                 /*
 229                  * Some sendfile implementations return 0 to indicate
 230                  * that there was a short read, but nothing was
 231                  * actually written to the socket.  In this case,
 232                  * fallback to the normal read path so the header gets
 233                  * the correct byte count.
 234                  */
 235                 DEBUG(3, ("send_file_readX: sendfile sent zero bytes "
 236                         "falling back to the normal read: %s\n",
 237                         fsp_str_dbg(fsp)));
 238                 goto normal_read;
 239         }
 240
 241         /*
 242          * We got a short read
 243          */
 244         goto out;
 245
 246 normal_read:
 247         /* Send out the header. */
 248         ret = write_data(fsp->conn->sconn->sock,
 249                          (const char *)hdr->data, hdr->length);
 250         if (ret != hdr->length) {
 251                 char addr[INET6_ADDRSTRLEN];
 252                 /*
 253                  * Try and give an error message saying what
 254                  * client failed.
 255                  */
 256                 DEBUG(0, ("smb2_sendfile_send_data: write_data failed "
 257                           "for client %s. Error %s\n",
 258                           get_peer_addr(fsp->conn->sconn->sock, addr,
 259                                         sizeof(addr)),
 260                           strerror(errno)));
 261
 262                 DEBUG(0,("smb2_sendfile_send_data: write_data failed for file "
 263                          "%s (%s). Terminating\n", fsp_str_dbg(fsp),
 264                          strerror(errno)));
 265                 exit_server_cleanly("smb2_sendfile_send_data: write_data failed");
 266         }
 267         nread = fake_sendfile(fsp, in_offset, in_length);
 268         if (nread == -1) {
 269                 DEBUG(0,("smb2_sendfile_send_data: "
 270                         "fake_sendfile failed for file "
 271                         "%s (%s). Terminating\n",
 272                         fsp_str_dbg(fsp),
 273                         strerror(errno)));
 274                 exit_server_cleanly("smb2_sendfile_send_data: "
 275                         "fake_sendfile failed");
 276         }
 277
 278   out:
 279
 280         if (nread < in_length) {
 281                 sendfile_short_send(fsp, nread, hdr->length, in_length);
 282         }
 283
 284         init_strict_lock_struct(fsp,
 285                                 fsp->op->global->open_persistent_id,
 286                                 in_offset,
 287                                 in_length,
 288                                 READ_LOCK,
 289                                 &lock);
 290
 291         SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lock);
 292         return 0;
 293 }
 294
 295 static NTSTATUS schedule_smb2_sendfile_read(struct smbd_smb2_request *smb2req,
 296                                         struct smbd_smb2_read_state *state)
 297 {
 298         struct smbd_smb2_read_state *state_copy = NULL;
 299         files_struct *fsp = state->fsp;
 300
 301         /*
 302          * We cannot use sendfile if...
 303          * We were not configured to do so OR
 304          * Signing is active OR
 305          * This is a compound SMB2 operation OR
 306          * fsp is a STREAM file OR
 307          * We're using a write cache OR
 308          * It's not a regular file OR
 309          * Requested offset is greater than file size OR
 310          * there's not enough data in the file.
 311          * Phew :-). Luckily this means most
 312          * reads on most normal files. JRA.
 313         */
 314
 315         if (!lp__use_sendfile(SNUM(fsp->conn)) ||
 316             smb2req->do_signing ||
 317             smb2req->do_encryption ||
 318             smb2req->in.vector_count >= (2*SMBD_SMB2_NUM_IOV_PER_REQ) ||
 319             (fsp->base_fsp != NULL) ||
 320             (fsp->wcp != NULL) ||
 321             (!S_ISREG(fsp->fsp_name->st.st_ex_mode)) ||
 322             (state->in_offset >= fsp->fsp_name->st.st_ex_size) ||
 323             (fsp->fsp_name->st.st_ex_size < state->in_offset + state->in_length))
 324         {
 325                 return NT_STATUS_RETRY;
 326         }
 327
 328         /* We've already checked there's this amount of data
 329            to read. */
 330         state->out_data.length = state->in_length;
 331         state->out_remaining = 0;
 332
 333         /* Make a copy of state attached to the smb2req. Attach
 334            the destructor here as this will trigger the sendfile
 335            call when the request is destroyed. */
 336         state_copy = talloc(smb2req, struct smbd_smb2_read_state);
 337         if (!state_copy) {
 338                 return NT_STATUS_NO_MEMORY;
 339         }
 340         *state_copy = *state;
 341         talloc_set_destructor(state_copy, smb2_sendfile_send_data);
 342         state->smb2req->queue_entry.sendfile_header = &state_copy->out_headers;
 343         return NT_STATUS_OK;
 344 }
 345
 346 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq);
 347
 348 /*******************************************************************
 349  Common read complete processing function for both synchronous and
 350  asynchronous reads.
 351 *******************************************************************/
 352
 353 NTSTATUS smb2_read_complete(struct tevent_req *req, ssize_t nread, int err)
 354 {
 355         struct smbd_smb2_read_state *state = tevent_req_data(req,
 356                                         struct smbd_smb2_read_state);
 357         files_struct *fsp = state->fsp;
 358
 359         if (nread < 0) {
 360                 NTSTATUS status = map_nt_error_from_unix(err);
 361
 362                 DEBUG( 3,( "smb2_read_complete: file %s nread = %d. "
 363                         "Error = %s (NTSTATUS %s)\n",
 364                         fsp_str_dbg(fsp),
 365                         (int)nread,
 366                         strerror(err),
 367                         nt_errstr(status)));
 368
 369                 return status;
 370         }
 371         if (nread == 0 && state->in_length != 0) {
 372                 DEBUG(5,("smb2_read_complete: read_file[%s] end of file\n",
 373                         fsp_str_dbg(fsp)));
 374                 return NT_STATUS_END_OF_FILE;
 375         }
 376
 377         if (nread < state->in_minimum) {
 378                 DEBUG(5,("smb2_read_complete: read_file[%s] read less %d than "
 379                         "minimum requested %u. Returning end of file\n",
 380                         fsp_str_dbg(fsp),
 381                         (int)nread,
 382                         (unsigned int)state->in_minimum));
 383                 return NT_STATUS_END_OF_FILE;
 384         }
 385
 386         DEBUG(3,("smbd_smb2_read: %s, file %s, length=%lu offset=%lu read=%lu\n",
 387                 fsp_fnum_dbg(fsp),
 388                 fsp_str_dbg(fsp),
 389                 (unsigned long)state->in_length,
 390                 (unsigned long)state->in_offset,
 391                 (unsigned long)nread));
 392
 393         state->out_data.length = nread;
 394         state->out_remaining = 0;
 395
 396         return NT_STATUS_OK;
 397 }
 398
 399 static bool smbd_smb2_read_cancel(struct tevent_req *req)
 400 {
 401         struct smbd_smb2_read_state *state =
 402                 tevent_req_data(req,
 403                 struct smbd_smb2_read_state);
 404
 405         return cancel_smb2_aio(state->smbreq);
 406 }
 407
 408 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
 409                                               struct tevent_context *ev,
 410                                               struct smbd_smb2_request *smb2req,
 411                                               struct files_struct *fsp,
 412                                               uint32_t in_length,
 413                                               uint64_t in_offset,
 414                                               uint32_t in_minimum,
 415                                               uint32_t in_remaining)
 416 {
 417         NTSTATUS status;
 418         struct tevent_req *req = NULL;
 419         struct smbd_smb2_read_state *state = NULL;
 420         struct smb_request *smbreq = NULL;
 421         connection_struct *conn = smb2req->tcon->compat;
 422         ssize_t nread = -1;
 423         struct lock_struct lock;
 424         int saved_errno;
 425
 426         req = tevent_req_create(mem_ctx, &state,
 427                                 struct smbd_smb2_read_state);
 428         if (req == NULL) {
 429                 return NULL;
 430         }
 431         state->smb2req = smb2req;
 432         state->in_length = in_length;
 433         state->in_offset = in_offset;
 434         state->in_minimum = in_minimum;
 435         state->out_data = data_blob_null;
 436         state->out_remaining = 0;
 437
 438         DEBUG(10,("smbd_smb2_read: %s - %s\n",
 439                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 440
 441         smbreq = smbd_smb2_fake_smb_request(smb2req);
 442         if (tevent_req_nomem(smbreq, req)) {
 443                 return tevent_req_post(req, ev);
 444         }
 445         state->smbreq = smbreq;
 446
 447         if (fsp->is_directory) {
 448                 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 449                 return tevent_req_post(req, ev);
 450         }
 451
 452         state->fsp = fsp;
 453
 454         if (IS_IPC(smbreq->conn)) {
 455                 struct tevent_req *subreq = NULL;
 456
 457                 state->out_data = data_blob_talloc(state, NULL, in_length);
 458                 if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
 459                         return tevent_req_post(req, ev);
 460                 }
 461
 462                 if (!fsp_is_np(fsp)) {
 463                         tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 464                         return tevent_req_post(req, ev);
 465                 }
 466
 467                 subreq = np_read_send(state, ev,
 468                                       fsp->fake_file_handle,
 469                                       state->out_data.data,
 470                                       state->out_data.length);
 471                 if (tevent_req_nomem(subreq, req)) {
 472                         return tevent_req_post(req, ev);
 473                 }
 474                 tevent_req_set_callback(subreq,
 475                                         smbd_smb2_read_pipe_done,
 476                                         req);
 477                 return req;
 478         }
 479
 480         if (!CHECK_READ(fsp, smbreq)) {
 481                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 482                 return tevent_req_post(req, ev);
 483         }
 484
 485         status = schedule_smb2_aio_read(fsp->conn,
 486                                 smbreq,
 487                                 fsp,
 488                                 state,
 489                                 &state->out_data,
 490                                 (off_t)in_offset,
 491                                 (size_t)in_length);
 492
 493         if (NT_STATUS_IS_OK(status)) {
 494                 /*
 495                  * Doing an async read, allow this
 496                  * request to be canceled
 497                  */
 498                 tevent_req_set_cancel_fn(req, smbd_smb2_read_cancel);
 499                 return req;
 500         }
 501
 502         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 503                 /* Real error in setting up aio. Fail. */
 504                 tevent_req_nterror(req, status);
 505                 return tevent_req_post(req, ev);
 506         }
 507
 508         /* Fallback to synchronous. */
 509
 510         init_strict_lock_struct(fsp,
 511                                 fsp->op->global->open_persistent_id,
 512                                 in_offset,
 513                                 in_length,
 514                                 READ_LOCK,
 515                                 &lock);
 516
 517         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
 518                 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
 519                 return tevent_req_post(req, ev);
 520         }
 521
 522         /* Try sendfile in preference. */
 523         status = schedule_smb2_sendfile_read(smb2req, state);
 524         if (NT_STATUS_IS_OK(status)) {
 525                 tevent_req_done(req);
 526                 return tevent_req_post(req, ev);
 527         } else {
 528                 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 529                         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 530                         tevent_req_nterror(req, status);
 531                         return tevent_req_post(req, ev);
 532                 }
 533         }
 534
 535         /* Ok, read into memory. Allocate the out buffer. */
 536         state->out_data = data_blob_talloc(state, NULL, in_length);
 537         if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
 538                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 539                 return tevent_req_post(req, ev);
 540         }
 541
 542         nread = read_file(fsp,
 543                           (char *)state->out_data.data,
 544                           in_offset,
 545                           in_length);
 546
 547         saved_errno = errno;
 548
 549         SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
 550
 551         DEBUG(10,("smbd_smb2_read: file %s, %s, offset=%llu "
 552                 "len=%llu returned %lld\n",
 553                 fsp_str_dbg(fsp),
 554                 fsp_fnum_dbg(fsp),
 555                 (unsigned long long)in_offset,
 556                 (unsigned long long)in_length,
 557                 (long long)nread));
 558
 559         status = smb2_read_complete(req, nread, saved_errno);
 560         if (!NT_STATUS_IS_OK(status)) {
 561                 tevent_req_nterror(req, status);
 562         } else {
 563                 /* Success. */
 564                 tevent_req_done(req);
 565         }
 566         return tevent_req_post(req, ev);
 567 }
 568
 569 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq)
 570 {
 571         struct tevent_req *req = tevent_req_callback_data(subreq,
 572                                  struct tevent_req);
 573         struct smbd_smb2_read_state *state = tevent_req_data(req,
 574                                              struct smbd_smb2_read_state);
 575         NTSTATUS status;
 576         ssize_t nread = -1;
 577         bool is_data_outstanding;
 578
 579         status = np_read_recv(subreq, &nread, &is_data_outstanding);
 580         TALLOC_FREE(subreq);
 581         if (!NT_STATUS_IS_OK(status)) {
 582                 NTSTATUS old = status;
 583                 status = nt_status_np_pipe(old);
 584                 tevent_req_nterror(req, status);
 585                 return;
 586         }
 587
 588         if (nread == 0 && state->out_data.length != 0) {
 589                 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
 590                 return;
 591         }
 592
 593         state->out_data.length = nread;
 594         state->out_remaining = 0;
 595
 596         /*
 597          * TODO: add STATUS_BUFFER_OVERFLOW handling, once we also
 598          * handle it in SMB1 pipe_read_andx_done().
 599          */
 600
 601         tevent_req_done(req);
 602 }
 603
 604 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
 605                                     TALLOC_CTX *mem_ctx,
 606                                     DATA_BLOB *out_data,
 607                                     uint32_t *out_remaining)
 608 {
 609         NTSTATUS status;
 610         struct smbd_smb2_read_state *state = tevent_req_data(req,
 611                                              struct smbd_smb2_read_state);
 612
 613         if (tevent_req_is_nterror(req, &status)) {
 614                 tevent_req_received(req);
 615                 return status;
 616         }
 617
 618         *out_data = state->out_data;
 619         talloc_steal(mem_ctx, out_data->data);
 620         *out_remaining = state->out_remaining;
 621
 622         tevent_req_received(req);
 623         return NT_STATUS_OK;
 624 }