source3/smbd/smb2_ioctl_network_fs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6    Copyright (C) David Disseldorp 2012
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.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 "../lib/ccan/build_assert/build_assert.h"
  29 #include "include/ntioctl.h"
  30 #include "../librpc/ndr/libndr.h"
  31 #include "librpc/gen_ndr/ndr_ioctl.h"
  32 #include "smb2_ioctl_private.h"
  33
  34 #define COPYCHUNK_MAX_CHUNKS    256             /* 2k8r2 & win8 = 256 */
  35 #define COPYCHUNK_MAX_CHUNK_LEN 1048576         /* 2k8r2 & win8 = 1048576 */
  36 #define COPYCHUNK_MAX_TOTAL_LEN 16777216        /* 2k8r2 & win8 = 16777216 */
  37 static void copychunk_pack_limits(struct srv_copychunk_rsp *cc_rsp)
  38 {
  39         cc_rsp->chunks_written = COPYCHUNK_MAX_CHUNKS;
  40         cc_rsp->chunk_bytes_written = COPYCHUNK_MAX_CHUNK_LEN;
  41         cc_rsp->total_bytes_written = COPYCHUNK_MAX_TOTAL_LEN;
  42 }
  43
  44 static NTSTATUS copychunk_check_limits(struct srv_copychunk_copy *cc_copy)
  45 {
  46         uint32_t i;
  47         uint32_t total_len = 0;
  48
  49         /*
  50          * [MS-SMB2] 3.3.5.15.6 Handling a Server-Side Data Copy Request
  51          * Send and invalid parameter response if:
  52          * - The ChunkCount value is greater than
  53          *   ServerSideCopyMaxNumberofChunks
  54          */
  55         if (cc_copy->chunk_count > COPYCHUNK_MAX_CHUNKS) {
  56                 return NT_STATUS_INVALID_PARAMETER;
  57         }
  58
  59         for (i = 0; i < cc_copy->chunk_count; i++) {
  60                 /*
  61                  * - The Length value in a single chunk is greater than
  62                  *   ServerSideCopyMaxChunkSize or equal to zero.
  63                  */
  64                 if ((cc_copy->chunks[i].length == 0)
  65                  || (cc_copy->chunks[i].length > COPYCHUNK_MAX_CHUNK_LEN)) {
  66                         return NT_STATUS_INVALID_PARAMETER;
  67                 }
  68                 total_len += cc_copy->chunks[i].length;
  69         }
  70         /*
  71          * - Sum of Lengths in all chunks is greater than
  72          *   ServerSideCopyMaxDataSize
  73          */
  74         if (total_len > COPYCHUNK_MAX_TOTAL_LEN) {
  75                 return NT_STATUS_INVALID_PARAMETER;
  76         }
  77
  78         return NT_STATUS_OK;
  79 }
  80
  81 struct fsctl_srv_copychunk_state {
  82         struct connection_struct *conn;
  83         uint32_t dispatch_count;
  84         uint32_t recv_count;
  85         uint32_t bad_recv_count;
  86         NTSTATUS status;
  87         off_t total_written;
  88         struct files_struct *src_fsp;
  89         struct files_struct *dst_fsp;
  90         enum {
  91                 COPYCHUNK_OUT_EMPTY = 0,
  92                 COPYCHUNK_OUT_LIMITS,
  93                 COPYCHUNK_OUT_RSP,
  94         } out_data;
  95 };
  96 static void fsctl_srv_copychunk_vfs_done(struct tevent_req *subreq);
  97
  98 static NTSTATUS copychunk_check_handles(uint32_t ctl_code,
  99                                         struct files_struct *src_fsp,
 100                                         struct files_struct *dst_fsp,
 101                                         struct smb_request *smb1req)
 102 {
 103         /*
 104          * [MS-SMB2] 3.3.5.15.6 Handling a Server-Side Data Copy Request
 105          * The server MUST fail the request with STATUS_ACCESS_DENIED if any of
 106          * the following are true:
 107          * - The Open.GrantedAccess of the destination file does not include
 108          *   FILE_WRITE_DATA or FILE_APPEND_DATA.
 109          */
 110         if (!CHECK_WRITE(dst_fsp)) {
 111                 DEBUG(5, ("copy chunk no write on dest handle (%s).\n",
 112                         smb_fname_str_dbg(dst_fsp->fsp_name) ));
 113                 return NT_STATUS_ACCESS_DENIED;
 114         }
 115         /*
 116          * - The Open.GrantedAccess of the destination file does not include
 117          *   FILE_READ_DATA, and the CtlCode is FSCTL_SRV_COPYCHUNK.
 118          */
 119         if ((ctl_code == FSCTL_SRV_COPYCHUNK)
 120           && !CHECK_READ(dst_fsp, smb1req)) {
 121                 DEBUG(5, ("copy chunk no read on dest handle (%s).\n",
 122                         smb_fname_str_dbg(dst_fsp->fsp_name) ));
 123                 return NT_STATUS_ACCESS_DENIED;
 124         }
 125         /*
 126          * - The Open.GrantedAccess of the source file does not include
 127          *   FILE_READ_DATA access.
 128          */
 129         if (!CHECK_READ(src_fsp, smb1req)) {
 130                 DEBUG(5, ("copy chunk no read on src handle (%s).\n",
 131                         smb_fname_str_dbg(src_fsp->fsp_name) ));
 132                 return NT_STATUS_ACCESS_DENIED;
 133         }
 134
 135         if (src_fsp->is_directory) {
 136                 DEBUG(5, ("copy chunk no read on src directory handle (%s).\n",
 137                         smb_fname_str_dbg(src_fsp->fsp_name) ));
 138                 return NT_STATUS_ACCESS_DENIED;
 139         }
 140
 141         if (dst_fsp->is_directory) {
 142                 DEBUG(5, ("copy chunk no read on dst directory handle (%s).\n",
 143                         smb_fname_str_dbg(dst_fsp->fsp_name) ));
 144                 return NT_STATUS_ACCESS_DENIED;
 145         }
 146
 147         if (IS_IPC(src_fsp->conn) || IS_IPC(dst_fsp->conn)) {
 148                 DEBUG(5, ("copy chunk no access on IPC$ handle.\n"));
 149                 return NT_STATUS_ACCESS_DENIED;
 150         }
 151
 152         if (IS_PRINT(src_fsp->conn) || IS_PRINT(dst_fsp->conn)) {
 153                 DEBUG(5, ("copy chunk no access on PRINT handle.\n"));
 154                 return NT_STATUS_ACCESS_DENIED;
 155         }
 156
 157         return NT_STATUS_OK;
 158 }
 159
 160 static struct tevent_req *fsctl_srv_copychunk_send(TALLOC_CTX *mem_ctx,
 161                                                    struct tevent_context *ev,
 162                                                    uint32_t ctl_code,
 163                                                    struct files_struct *dst_fsp,
 164                                                    DATA_BLOB *in_input,
 165                                                    size_t in_max_output,
 166                                                    struct smbd_smb2_request *smb2req)
 167 {
 168         struct tevent_req *req;
 169         struct srv_copychunk_copy cc_copy;
 170         enum ndr_err_code ndr_ret;
 171         uint64_t src_persistent_h;
 172         uint64_t src_volatile_h;
 173         int i;
 174         struct srv_copychunk *chunk;
 175         struct fsctl_srv_copychunk_state *state;
 176
 177         /* handler for both copy-chunk variants */
 178         SMB_ASSERT((ctl_code == FSCTL_SRV_COPYCHUNK)
 179                 || (ctl_code == FSCTL_SRV_COPYCHUNK_WRITE));
 180
 181         req = tevent_req_create(mem_ctx, &state,
 182                                 struct fsctl_srv_copychunk_state);
 183         if (req == NULL) {
 184                 return NULL;
 185         }
 186         state->conn = dst_fsp->conn;
 187
 188         if (in_max_output < sizeof(struct srv_copychunk_rsp)) {
 189                 DEBUG(3, ("max output %d not large enough to hold copy chunk "
 190                           "response %lu\n", (int)in_max_output,
 191                           (unsigned long)sizeof(struct srv_copychunk_rsp)));
 192                 state->status = NT_STATUS_INVALID_PARAMETER;
 193                 tevent_req_nterror(req, state->status);
 194                 return tevent_req_post(req, ev);
 195         }
 196
 197         ndr_ret = ndr_pull_struct_blob(in_input, mem_ctx, &cc_copy,
 198                         (ndr_pull_flags_fn_t)ndr_pull_srv_copychunk_copy);
 199         if (ndr_ret != NDR_ERR_SUCCESS) {
 200                 DEBUG(0, ("failed to unmarshall copy chunk req\n"));
 201                 state->status = NT_STATUS_INVALID_PARAMETER;
 202                 tevent_req_nterror(req, state->status);
 203                 return tevent_req_post(req, ev);
 204         }
 205
 206         /* persistent/volatile keys sent as the resume key */
 207         src_persistent_h = BVAL(cc_copy.source_key, 0);
 208         src_volatile_h = BVAL(cc_copy.source_key, 8);
 209         state->src_fsp = file_fsp_get(smb2req, src_persistent_h, src_volatile_h);
 210         if (state->src_fsp == NULL) {
 211                 DEBUG(3, ("invalid resume key in copy chunk req\n"));
 212                 state->status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
 213                 tevent_req_nterror(req, state->status);
 214                 return tevent_req_post(req, ev);
 215         }
 216
 217         state->dst_fsp = dst_fsp;
 218
 219         state->status = copychunk_check_handles(ctl_code,
 220                                                 state->src_fsp,
 221                                                 state->dst_fsp,
 222                                                 smb2req->smb1req);
 223         if (!NT_STATUS_IS_OK(state->status)) {
 224                 tevent_req_nterror(req, state->status);
 225                 return tevent_req_post(req, ev);
 226         }
 227
 228         state->status = copychunk_check_limits(&cc_copy);
 229         if (tevent_req_nterror(req, state->status)) {
 230                 DEBUG(3, ("copy chunk req exceeds limits\n"));
 231                 state->out_data = COPYCHUNK_OUT_LIMITS;
 232                 return tevent_req_post(req, ev);
 233         }
 234
 235         /* any errors from here onwards should carry copychunk response data */
 236         state->out_data = COPYCHUNK_OUT_RSP;
 237
 238         for (i = 0; i < cc_copy.chunk_count; i++) {
 239                 struct tevent_req *vfs_subreq;
 240                 chunk = &cc_copy.chunks[i];
 241                 vfs_subreq = SMB_VFS_COPY_CHUNK_SEND(dst_fsp->conn,
 242                                                      state, ev,
 243                                                      state->src_fsp,
 244                                                      chunk->source_off,
 245                                                      state->dst_fsp,
 246                                                      chunk->target_off,
 247                                                      chunk->length);
 248                 if (vfs_subreq == NULL) {
 249                         DEBUG(0, ("VFS copy chunk send failed\n"));
 250                         state->status = NT_STATUS_NO_MEMORY;
 251                         if (state->dispatch_count == 0) {
 252                                 /* nothing dispatched, return immediately */
 253                                 tevent_req_nterror(req, state->status);
 254                                 return tevent_req_post(req, ev);
 255                         } else {
 256                                 /*
 257                                  * wait for dispatched to complete before
 258                                  * returning error.
 259                                  */
 260                                 break;
 261                         }
 262                 }
 263                 tevent_req_set_callback(vfs_subreq,
 264                                         fsctl_srv_copychunk_vfs_done, req);
 265                 state->dispatch_count++;
 266         }
 267
 268         return req;
 269 }
 270
 271 static void fsctl_srv_copychunk_vfs_done(struct tevent_req *subreq)
 272 {
 273         struct tevent_req *req = tevent_req_callback_data(
 274                 subreq, struct tevent_req);
 275         struct fsctl_srv_copychunk_state *state = tevent_req_data(req,
 276                                         struct fsctl_srv_copychunk_state);
 277         off_t chunk_nwritten;
 278         NTSTATUS status;
 279
 280         state->recv_count++;
 281         status = SMB_VFS_COPY_CHUNK_RECV(state->conn, subreq,
 282                                          &chunk_nwritten);
 283         TALLOC_FREE(subreq);
 284         if (NT_STATUS_IS_OK(status)) {
 285                 DEBUG(10, ("good copy chunk recv %u of %u\n",
 286                            (unsigned int)state->recv_count,
 287                            (unsigned int)state->dispatch_count));
 288                 state->total_written += chunk_nwritten;
 289         } else {
 290                 DEBUG(0, ("bad status in copy chunk recv %u of %u: %s\n",
 291                           (unsigned int)state->recv_count,
 292                           (unsigned int)state->dispatch_count,
 293                           nt_errstr(status)));
 294                 state->bad_recv_count++;
 295                 /* may overwrite previous failed status */
 296                 state->status = status;
 297         }
 298
 299         if (state->recv_count != state->dispatch_count) {
 300                 /*
 301                  * Wait for all VFS copy_chunk requests to complete, even
 302                  * if an error is received for a specific chunk.
 303                  */
 304                 return;
 305         }
 306
 307         if (!tevent_req_nterror(req, state->status)) {
 308                 tevent_req_done(req);
 309         }
 310 }
 311
 312 static NTSTATUS fsctl_srv_copychunk_recv(struct tevent_req *req,
 313                                          struct srv_copychunk_rsp *cc_rsp,
 314                                          bool *pack_rsp)
 315 {
 316         struct fsctl_srv_copychunk_state *state = tevent_req_data(req,
 317                                         struct fsctl_srv_copychunk_state);
 318         NTSTATUS status;
 319
 320         switch (state->out_data) {
 321         case COPYCHUNK_OUT_EMPTY:
 322                 *pack_rsp = false;
 323                 break;
 324         case COPYCHUNK_OUT_LIMITS:
 325                 /* 2.2.32.1 - send back our maximum transfer size limits */
 326                 copychunk_pack_limits(cc_rsp);
 327                 *pack_rsp = true;
 328                 break;
 329         case COPYCHUNK_OUT_RSP:
 330                 cc_rsp->chunks_written = state->recv_count - state->bad_recv_count;
 331                 cc_rsp->chunk_bytes_written = 0;
 332                 cc_rsp->total_bytes_written = state->total_written;
 333                 *pack_rsp = true;
 334                 break;
 335         default:        /* not reached */
 336                 assert(1);
 337                 break;
 338         }
 339         status = state->status;
 340         tevent_req_received(req);
 341
 342         return status;
 343 }
 344
 345 static NTSTATUS fsctl_validate_neg_info(TALLOC_CTX *mem_ctx,
 346                                         struct tevent_context *ev,
 347                                         struct smbXsrv_connection *conn,
 348                                         DATA_BLOB *in_input,
 349                                         uint32_t in_max_output,
 350                                         DATA_BLOB *out_output,
 351                                         bool *disconnect)
 352 {
 353         uint32_t in_capabilities;
 354         DATA_BLOB in_guid_blob;
 355         struct GUID in_guid;
 356         uint16_t in_security_mode;
 357         uint16_t in_num_dialects;
 358         uint16_t i;
 359         DATA_BLOB out_guid_blob;
 360         NTSTATUS status;
 361
 362         if (in_input->length < 0x18) {
 363                 return NT_STATUS_INVALID_PARAMETER;
 364         }
 365
 366         in_capabilities = IVAL(in_input->data, 0x00);
 367         in_guid_blob = data_blob_const(in_input->data + 0x04, 16);
 368         in_security_mode = SVAL(in_input->data, 0x14);
 369         in_num_dialects = SVAL(in_input->data, 0x16);
 370
 371         if (in_input->length < (0x18 + in_num_dialects*2)) {
 372                 return NT_STATUS_INVALID_PARAMETER;
 373         }
 374
 375         if (in_max_output < 0x18) {
 376                 return NT_STATUS_BUFFER_TOO_SMALL;
 377         }
 378
 379         status = GUID_from_ndr_blob(&in_guid_blob, &in_guid);
 380         if (!NT_STATUS_IS_OK(status)) {
 381                 return status;
 382         }
 383
 384         if (in_num_dialects != conn->smb2.client.num_dialects) {
 385                 *disconnect = true;
 386                 return NT_STATUS_ACCESS_DENIED;
 387         }
 388
 389         for (i=0; i < in_num_dialects; i++) {
 390                 uint16_t v = SVAL(in_input->data, 0x18 + i*2);
 391
 392                 if (conn->smb2.client.dialects[i] != v) {
 393                         *disconnect = true;
 394                         return NT_STATUS_ACCESS_DENIED;
 395                 }
 396         }
 397
 398         if (GUID_compare(&in_guid, &conn->smb2.client.guid) != 0) {
 399                 *disconnect = true;
 400                 return NT_STATUS_ACCESS_DENIED;
 401         }
 402
 403         if (in_security_mode != conn->smb2.client.security_mode) {
 404                 *disconnect = true;
 405                 return NT_STATUS_ACCESS_DENIED;
 406         }
 407
 408         if (in_capabilities != conn->smb2.client.capabilities) {
 409                 *disconnect = true;
 410                 return NT_STATUS_ACCESS_DENIED;
 411         }
 412
 413         status = GUID_to_ndr_blob(&conn->smb2.server.guid, mem_ctx,
 414                                   &out_guid_blob);
 415         if (!NT_STATUS_IS_OK(status)) {
 416                 return status;
 417         }
 418
 419         *out_output = data_blob_talloc(mem_ctx, NULL, 0x18);
 420         if (out_output->data == NULL) {
 421                 return NT_STATUS_NO_MEMORY;
 422         }
 423
 424         SIVAL(out_output->data, 0x00, conn->smb2.server.capabilities);
 425         memcpy(out_output->data+0x04, out_guid_blob.data, 16);
 426         SSVAL(out_output->data, 0x14, conn->smb2.server.security_mode);
 427         SSVAL(out_output->data, 0x16, conn->smb2.server.dialect);
 428
 429         return NT_STATUS_OK;
 430 }
 431
 432 static NTSTATUS fsctl_srv_req_resume_key(TALLOC_CTX *mem_ctx,
 433                                          struct tevent_context *ev,
 434                                          struct files_struct *fsp,
 435                                          uint32_t in_max_output,
 436                                          DATA_BLOB *out_output)
 437 {
 438         struct req_resume_key_rsp rkey_rsp;
 439         enum ndr_err_code ndr_ret;
 440         DATA_BLOB output;
 441
 442         if (fsp == NULL) {
 443                 return NT_STATUS_FILE_CLOSED;
 444         }
 445
 446         ZERO_STRUCT(rkey_rsp);
 447         /* combine persistent and volatile handles for the resume key */
 448         SBVAL(rkey_rsp.resume_key, 0, fsp->op->global->open_persistent_id);
 449         SBVAL(rkey_rsp.resume_key, 8, fsp->op->global->open_volatile_id);
 450
 451         ndr_ret = ndr_push_struct_blob(&output, mem_ctx, &rkey_rsp,
 452                         (ndr_push_flags_fn_t)ndr_push_req_resume_key_rsp);
 453         if (ndr_ret != NDR_ERR_SUCCESS) {
 454                 return NT_STATUS_INTERNAL_ERROR;
 455         }
 456
 457         if (in_max_output < output.length) {
 458                 DEBUG(1, ("max output %u too small for resume key rsp %ld\n",
 459                           (unsigned int)in_max_output, (long int)output.length));
 460                 return NT_STATUS_INVALID_PARAMETER;
 461         }
 462         *out_output = output;
 463
 464         return NT_STATUS_OK;
 465 }
 466
 467 static void smb2_ioctl_network_fs_copychunk_done(struct tevent_req *subreq);
 468
 469 struct tevent_req *smb2_ioctl_network_fs(uint32_t ctl_code,
 470                                          struct tevent_context *ev,
 471                                          struct tevent_req *req,
 472                                          struct smbd_smb2_ioctl_state *state)
 473 {
 474         struct tevent_req *subreq;
 475         NTSTATUS status;
 476
 477         switch (ctl_code) {
 478         /*
 479          * [MS-SMB2] 2.2.31
 480          * FSCTL_SRV_COPYCHUNK is issued when a handle has
 481          * FILE_READ_DATA and FILE_WRITE_DATA access to the file;
 482          * FSCTL_SRV_COPYCHUNK_WRITE is issued when a handle only has
 483          * FILE_WRITE_DATA access.
 484          */
 485         case FSCTL_SRV_COPYCHUNK_WRITE: /* FALL THROUGH */
 486         case FSCTL_SRV_COPYCHUNK:
 487                 subreq = fsctl_srv_copychunk_send(state, ev,
 488                                                   ctl_code,
 489                                                   state->fsp,
 490                                                   &state->in_input,
 491                                                   state->in_max_output,
 492                                                   state->smb2req);
 493                 if (tevent_req_nomem(subreq, req)) {
 494                         return tevent_req_post(req, ev);
 495                 }
 496                 tevent_req_set_callback(subreq,
 497                                         smb2_ioctl_network_fs_copychunk_done,
 498                                         req);
 499                 return req;
 500                 break;
 501         case FSCTL_VALIDATE_NEGOTIATE_INFO:
 502                 status = fsctl_validate_neg_info(state, ev,
 503                                                  state->smbreq->sconn->conn,
 504                                                  &state->in_input,
 505                                                  state->in_max_output,
 506                                                  &state->out_output,
 507                                                  &state->disconnect);
 508                 if (!tevent_req_nterror(req, status)) {
 509                         tevent_req_done(req);
 510                 }
 511                 return tevent_req_post(req, ev);
 512                 break;
 513         case FSCTL_SRV_REQUEST_RESUME_KEY:
 514                 status = fsctl_srv_req_resume_key(state, ev, state->fsp,
 515                                                   state->in_max_output,
 516                                                   &state->out_output);
 517                 if (!tevent_req_nterror(req, status)) {
 518                         tevent_req_done(req);
 519                 }
 520                 return tevent_req_post(req, ev);
 521                 break;
 522         default: {
 523                 uint8_t *out_data = NULL;
 524                 uint32_t out_data_len = 0;
 525
 526                 if (state->fsp == NULL) {
 527                         status = NT_STATUS_NOT_SUPPORTED;
 528                 } else {
 529                         status = SMB_VFS_FSCTL(state->fsp,
 530                                                state,
 531                                                ctl_code,
 532                                                state->smbreq->flags2,
 533                                                state->in_input.data,
 534                                                state->in_input.length,
 535                                                &out_data,
 536                                                state->in_max_output,
 537                                                &out_data_len);
 538                         state->out_output = data_blob_const(out_data, out_data_len);
 539                         if (NT_STATUS_IS_OK(status)) {
 540                                 tevent_req_done(req);
 541                                 return tevent_req_post(req, ev);
 542                         }
 543                 }
 544
 545                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 546                         if (IS_IPC(state->smbreq->conn)) {
 547                                 status = NT_STATUS_FS_DRIVER_REQUIRED;
 548                         } else {
 549                                 status = NT_STATUS_INVALID_DEVICE_REQUEST;
 550                         }
 551                 }
 552
 553                 tevent_req_nterror(req, status);
 554                 return tevent_req_post(req, ev);
 555                 break;
 556         }
 557         }
 558
 559         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 560         return tevent_req_post(req, ev);
 561 }
 562
 563 static void smb2_ioctl_network_fs_copychunk_done(struct tevent_req *subreq)
 564 {
 565         struct tevent_req *req = tevent_req_callback_data(subreq,
 566                                                           struct tevent_req);
 567         struct smbd_smb2_ioctl_state *ioctl_state = tevent_req_data(req,
 568                                                 struct smbd_smb2_ioctl_state);
 569         struct srv_copychunk_rsp cc_rsp;
 570         NTSTATUS status;
 571         bool pack_rsp = false;
 572
 573         ZERO_STRUCT(cc_rsp);
 574         status = fsctl_srv_copychunk_recv(subreq, &cc_rsp, &pack_rsp);
 575         TALLOC_FREE(subreq);
 576         if (pack_rsp == true) {
 577                 enum ndr_err_code ndr_ret;
 578                 ndr_ret = ndr_push_struct_blob(&ioctl_state->out_output,
 579                                                ioctl_state,
 580                                                &cc_rsp,
 581                                 (ndr_push_flags_fn_t)ndr_push_srv_copychunk_rsp);
 582                 if (ndr_ret != NDR_ERR_SUCCESS) {
 583                         status = NT_STATUS_INTERNAL_ERROR;
 584                 }
 585         }
 586
 587         if (!tevent_req_nterror(req, status)) {
 588                 tevent_req_done(req);
 589         }
 590 }