source3/smbd/smb2_ioctl_filesys.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6    Copyright (C) David Disseldorp 2013-2015
   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 "rpc_server/srv_pipe_hnd.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 /*
  35  * XXX this may reduce dup_extents->byte_count so that it's less than the
  36  * target file size.
  37  */
  38 static NTSTATUS fsctl_dup_extents_check_lengths(struct files_struct *src_fsp,
  39                                                 struct files_struct *dst_fsp,
  40                                 struct fsctl_dup_extents_to_file *dup_extents)
  41 {
  42         NTSTATUS status;
  43
  44         if ((dup_extents->source_off + dup_extents->byte_count
  45                                                 < dup_extents->source_off)
  46          || (dup_extents->target_off + dup_extents->byte_count
  47                                                 < dup_extents->target_off)) {
  48                 return NT_STATUS_INVALID_PARAMETER;     /* wrap */
  49         }
  50
  51         status = vfs_stat_fsp(src_fsp);
  52         if (!NT_STATUS_IS_OK(status)) {
  53                 return status;
  54         }
  55
  56         /*
  57          * XXX vfs_btrfs and vfs_default have size checks in the copychunk
  58          * handler, as this needs to be rechecked after the src has potentially
  59          * been extended by a previous chunk in the compound copychunk req.
  60          */
  61         if (src_fsp->fsp_name->st.st_ex_size
  62                         < dup_extents->source_off + dup_extents->byte_count) {
  63                 DEBUG(2, ("dup_extents req exceeds src size\n"));
  64                 return NT_STATUS_NOT_SUPPORTED;
  65         }
  66
  67         status = vfs_stat_fsp(dst_fsp);
  68         if (!NT_STATUS_IS_OK(status)) {
  69                 return status;
  70         }
  71
  72         if (dst_fsp->fsp_name->st.st_ex_size
  73                         < dup_extents->target_off + dup_extents->byte_count) {
  74
  75                 if (dst_fsp->fsp_name->st.st_ex_size - dup_extents->target_off
  76                                         > dst_fsp->fsp_name->st.st_ex_size) {
  77                         return NT_STATUS_INVALID_PARAMETER;     /* wrap */
  78                 }
  79
  80                 /*
  81                  * this server behaviour is pretty hairy, but we need to match
  82                  * Windows, so...
  83                  */
  84                 DEBUG(2, ("dup_extents req exceeds target size, capping\n"));
  85                 dup_extents->byte_count = dst_fsp->fsp_name->st.st_ex_size
  86                                                 - dup_extents->target_off;
  87         }
  88
  89         return NT_STATUS_OK;
  90 }
  91
  92 static NTSTATUS fsctl_dup_extents_check_overlap(struct files_struct *src_fsp,
  93                                                 struct files_struct *dst_fsp,
  94                                 struct fsctl_dup_extents_to_file *dup_extents)
  95 {
  96         uint64_t src_off_last;
  97         uint64_t tgt_off_last;
  98
  99         if (!file_id_equal(&src_fsp->file_id, &dst_fsp->file_id)) {
 100                 /* src and dest refer to different files */
 101                 return NT_STATUS_OK;
 102         }
 103
 104         if (dup_extents->byte_count == 0) {
 105                 /* no range to overlap */
 106                 return NT_STATUS_OK;
 107         }
 108
 109         /*
 110          * [MS-FSCC] 2.3.8 FSCTL_DUPLICATE_EXTENTS_TO_FILE Reply
 111          * STATUS_NOT_SUPPORTED:
 112          * The source and target destination ranges overlap on the same file.
 113          */
 114
 115         src_off_last = dup_extents->source_off + dup_extents->byte_count - 1;
 116         if ((dup_extents->target_off >= dup_extents->source_off)
 117                                 && (dup_extents->target_off <= src_off_last)) {
 118                 /*
 119                  * src: |-----------|
 120                  * tgt:       |-----------|
 121                  */
 122                 return NT_STATUS_NOT_SUPPORTED;
 123         }
 124
 125
 126         tgt_off_last = dup_extents->target_off + dup_extents->byte_count - 1;
 127         if ((tgt_off_last >= dup_extents->source_off)
 128                                         && (tgt_off_last <= src_off_last)) {
 129                 /*
 130                  * src:       |-----------|
 131                  * tgt: |-----------|
 132                  */
 133                 return NT_STATUS_NOT_SUPPORTED;
 134         }
 135
 136         return NT_STATUS_OK;
 137 }
 138
 139 static NTSTATUS fsctl_dup_extents_check_sparse(struct files_struct *src_fsp,
 140                                                struct files_struct *dst_fsp)
 141 {
 142         /*
 143          * 2.3.8 FSCTL_DUPLICATE_EXTENTS_TO_FILE Reply...
 144          * STATUS_NOT_SUPPORTED: Target file is sparse, while source
 145          *                       is a non-sparse file.
 146          *
 147          * WS2016 has the following behaviour (MS are in the process of fixing
 148          * the spec):
 149          * STATUS_NOT_SUPPORTED is returned if the source is sparse, while the
 150          * target is non-sparse. However, if target is sparse while the source
 151          * is non-sparse, then FSCTL_DUPLICATE_EXTENTS_TO_FILE completes
 152          * successfully.
 153          */
 154         if ((src_fsp->is_sparse) && (!dst_fsp->is_sparse)) {
 155                 return NT_STATUS_NOT_SUPPORTED;
 156         }
 157
 158         return NT_STATUS_OK;
 159 }
 160
 161 struct fsctl_dup_extents_state {
 162         struct tevent_context *ev;
 163         struct connection_struct *conn;
 164         struct fsctl_dup_extents_to_file dup_extents;
 165 };
 166
 167 static void fsctl_dup_extents_vfs_done(struct tevent_req *subreq);
 168
 169 static struct tevent_req *fsctl_dup_extents_send(TALLOC_CTX *mem_ctx,
 170                                                  struct tevent_context *ev,
 171                                                  struct files_struct *dst_fsp,
 172                                                  DATA_BLOB *in_input,
 173                                                  struct smbd_smb2_request *smb2req)
 174 {
 175         struct tevent_req *req = NULL;
 176         struct tevent_req *subreq = NULL;
 177         struct fsctl_dup_extents_state *state = NULL;
 178         uint64_t src_fid_persistent = 0;
 179         uint64_t src_fid_volatile = 0;
 180         struct files_struct *src_fsp = NULL;
 181         int ndr_ret;
 182         NTSTATUS status;
 183
 184         req = tevent_req_create(mem_ctx, &state,
 185                                 struct fsctl_dup_extents_state);
 186         if (req == NULL) {
 187                 return NULL;
 188         }
 189         *state = (struct fsctl_dup_extents_state) {
 190                 .conn = dst_fsp->conn,
 191                 .ev = ev,
 192         };
 193
 194         if (dst_fsp == NULL) {
 195                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 196                 return tevent_req_post(req, ev);
 197         }
 198
 199         if ((dst_fsp->conn->fs_capabilities
 200                                 & FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0) {
 201                 DBG_INFO("FS does not advertise block refcounting support\n");
 202                 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 203                 return tevent_req_post(req, ev);
 204         }
 205
 206         ndr_ret = ndr_pull_struct_blob(in_input, state, &state->dup_extents,
 207                        (ndr_pull_flags_fn_t)ndr_pull_fsctl_dup_extents_to_file);
 208         if (ndr_ret != NDR_ERR_SUCCESS) {
 209                 DBG_ERR("failed to unmarshall dup extents to file req\n");
 210                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 211                 return tevent_req_post(req, ev);
 212         }
 213
 214         src_fid_persistent = BVAL(state->dup_extents.source_fid, 0);
 215         src_fid_volatile = BVAL(state->dup_extents.source_fid, 8);
 216         src_fsp = file_fsp_get(smb2req, src_fid_persistent, src_fid_volatile);
 217         if ((src_fsp == NULL)
 218                       || (src_fsp->file_id.devid != dst_fsp->file_id.devid)) {
 219                 /*
 220                  * [MS-FSCC] 2.3.8 FSCTL_DUPLICATE_EXTENTS_TO_FILE Reply
 221                  * STATUS_INVALID_PARAMETER:
 222                  * The FileHandle parameter is either invalid or does not
 223                  * represent a handle to an opened file on the same volume.
 224                  *
 225                  * Windows Server responds with NT_STATUS_INVALID_HANDLE instead
 226                  * of STATUS_INVALID_PARAMETER here, despite the above spec.
 227                  */
 228                 DBG_ERR("invalid src_fsp for dup_extents\n");
 229                 tevent_req_nterror(req, NT_STATUS_INVALID_HANDLE);
 230                 return tevent_req_post(req, ev);
 231         }
 232
 233         status = fsctl_dup_extents_check_lengths(src_fsp, dst_fsp,
 234                                                  &state->dup_extents);
 235         if (!NT_STATUS_IS_OK(status)) {
 236                 tevent_req_nterror(req, status);
 237                 return tevent_req_post(req, ev);
 238         }
 239
 240         if (state->dup_extents.byte_count == 0) {
 241                 DBG_ERR("skipping zero length dup extents\n");
 242                 tevent_req_done(req);
 243                 return tevent_req_post(req, ev);
 244         }
 245
 246         status = fsctl_dup_extents_check_overlap(src_fsp, dst_fsp,
 247                                                  &state->dup_extents);
 248         if (!NT_STATUS_IS_OK(status)) {
 249                 tevent_req_nterror(req, status);
 250                 return tevent_req_post(req, ev);
 251         }
 252
 253         status = fsctl_dup_extents_check_sparse(src_fsp, dst_fsp);
 254         if (!NT_STATUS_IS_OK(status)) {
 255                 tevent_req_nterror(req, status);
 256                 return tevent_req_post(req, ev);
 257         }
 258
 259         /* tell the VFS to ignore locks across the clone, matching ReFS */
 260         subreq = SMB_VFS_COPY_CHUNK_SEND(dst_fsp->conn, state, ev,
 261                                          src_fsp, state->dup_extents.source_off,
 262                                          dst_fsp, state->dup_extents.target_off,
 263                                          state->dup_extents.byte_count,
 264                                          VFS_COPY_CHUNK_FL_MUST_CLONE
 265                                          | VFS_COPY_CHUNK_FL_IGNORE_LOCKS);
 266         if (tevent_req_nomem(subreq, req)) {
 267                 return tevent_req_post(req, ev);
 268         }
 269
 270         tevent_req_set_callback(subreq, fsctl_dup_extents_vfs_done, req);
 271
 272         return subreq;
 273 }
 274
 275 static void fsctl_dup_extents_vfs_done(struct tevent_req *subreq)
 276 {
 277         struct tevent_req *req = tevent_req_callback_data(
 278                 subreq, struct tevent_req);
 279         struct fsctl_dup_extents_state *state = tevent_req_data(
 280                 req, struct fsctl_dup_extents_state);
 281         off_t nb_chunk;
 282         NTSTATUS status;
 283
 284         status = SMB_VFS_COPY_CHUNK_RECV(state->conn, subreq, &nb_chunk);
 285         TALLOC_FREE(subreq);
 286         if (tevent_req_nterror(req, status)) {
 287                 return;
 288         }
 289
 290         if (nb_chunk != state->dup_extents.byte_count) {
 291                 tevent_req_nterror(req, NT_STATUS_IO_DEVICE_ERROR);
 292                 return;
 293         }
 294
 295         tevent_req_done(req);
 296 }
 297
 298 static NTSTATUS fsctl_dup_extents_recv(struct tevent_req *req)
 299 {
 300         return tevent_req_simple_recv_ntstatus(req);
 301 }
 302
 303 static NTSTATUS fsctl_get_cmprn(TALLOC_CTX *mem_ctx,
 304                                 struct tevent_context *ev,
 305                                 struct files_struct *fsp,
 306                                 size_t in_max_output,
 307                                 DATA_BLOB *out_output)
 308 {
 309         struct compression_state cmpr_state;
 310         enum ndr_err_code ndr_ret;
 311         DATA_BLOB output;
 312         NTSTATUS status;
 313
 314         if (fsp == NULL) {
 315                 return NT_STATUS_FILE_CLOSED;
 316         }
 317
 318         /* Windows doesn't check for SEC_FILE_READ_ATTRIBUTE permission here */
 319
 320         ZERO_STRUCT(cmpr_state);
 321         if (fsp->conn->fs_capabilities & FILE_FILE_COMPRESSION) {
 322                 status = SMB_VFS_GET_COMPRESSION(fsp->conn,
 323                                                  mem_ctx,
 324                                                  fsp,
 325                                                  NULL,
 326                                                  &cmpr_state.format);
 327                 if (!NT_STATUS_IS_OK(status)) {
 328                         return status;
 329                 }
 330         } else {
 331                 /*
 332                  * bso#12144: The underlying filesystem doesn't support
 333                  * compression, so we should respond with "not-compressed"
 334                  * (like WS2016 ReFS) instead of STATUS_NOT_SUPPORTED or
 335                  * NT_STATUS_INVALID_DEVICE_REQUEST.
 336                  */
 337                 cmpr_state.format = COMPRESSION_FORMAT_NONE;
 338         }
 339
 340         ndr_ret = ndr_push_struct_blob(&output, mem_ctx,
 341                                        &cmpr_state,
 342                         (ndr_push_flags_fn_t)ndr_push_compression_state);
 343         if (ndr_ret != NDR_ERR_SUCCESS) {
 344                 return NT_STATUS_INTERNAL_ERROR;
 345         }
 346
 347         if (in_max_output < output.length) {
 348                 DEBUG(1, ("max output %u too small for compression state %ld\n",
 349                       (unsigned int)in_max_output, (long int)output.length));
 350                 return NT_STATUS_INVALID_USER_BUFFER;
 351         }
 352         *out_output = output;
 353
 354         return NT_STATUS_OK;
 355 }
 356
 357 static NTSTATUS fsctl_set_cmprn(TALLOC_CTX *mem_ctx,
 358                                 struct tevent_context *ev,
 359                                 struct files_struct *fsp,
 360                                 DATA_BLOB *in_input)
 361 {
 362         struct compression_state cmpr_state;
 363         enum ndr_err_code ndr_ret;
 364         NTSTATUS status;
 365
 366         if (fsp == NULL) {
 367                 return NT_STATUS_FILE_CLOSED;
 368         }
 369
 370         /* WRITE_DATA permission is required, WRITE_ATTRIBUTES is not */
 371         status = check_access_fsp(fsp, FILE_WRITE_DATA);
 372         if (!NT_STATUS_IS_OK(status)) {
 373                 return status;
 374         }
 375
 376         ndr_ret = ndr_pull_struct_blob(in_input, mem_ctx, &cmpr_state,
 377                         (ndr_pull_flags_fn_t)ndr_pull_compression_state);
 378         if (ndr_ret != NDR_ERR_SUCCESS) {
 379                 DEBUG(0, ("failed to unmarshall set compression req\n"));
 380                 return NT_STATUS_INVALID_PARAMETER;
 381         }
 382
 383         status = NT_STATUS_NOT_SUPPORTED;
 384         if (fsp->conn->fs_capabilities & FILE_FILE_COMPRESSION) {
 385                 status = SMB_VFS_SET_COMPRESSION(fsp->conn,
 386                                                  mem_ctx,
 387                                                  fsp,
 388                                                  cmpr_state.format);
 389         } else if (cmpr_state.format == COMPRESSION_FORMAT_NONE) {
 390                 /*
 391                  * bso#12144: The underlying filesystem doesn't support
 392                  * compression. We should still accept set(FORMAT_NONE) requests
 393                  * (like WS2016 ReFS).
 394                  */
 395                 status = NT_STATUS_OK;
 396         }
 397
 398         return status;
 399 }
 400
 401 static NTSTATUS fsctl_zero_data(TALLOC_CTX *mem_ctx,
 402                                 struct tevent_context *ev,
 403                                 struct files_struct *fsp,
 404                                 DATA_BLOB *in_input)
 405 {
 406         struct file_zero_data_info zdata_info;
 407         enum ndr_err_code ndr_ret;
 408         struct lock_struct lck;
 409         int mode;
 410         uint64_t len;
 411         int ret;
 412         NTSTATUS status;
 413
 414         if (fsp == NULL) {
 415                 return NT_STATUS_FILE_CLOSED;
 416         }
 417
 418         /* WRITE_DATA permission is required */
 419         status = check_access_fsp(fsp, FILE_WRITE_DATA);
 420         if (!NT_STATUS_IS_OK(status)) {
 421                 return status;
 422         }
 423
 424         /* allow regardless of whether FS supports sparse or not */
 425
 426         ndr_ret = ndr_pull_struct_blob(in_input, mem_ctx, &zdata_info,
 427                         (ndr_pull_flags_fn_t)ndr_pull_file_zero_data_info);
 428         if (ndr_ret != NDR_ERR_SUCCESS) {
 429                 DEBUG(0, ("failed to unmarshall zero data request\n"));
 430                 return NT_STATUS_INVALID_PARAMETER;
 431         }
 432
 433         if (zdata_info.beyond_final_zero < zdata_info.file_off) {
 434                 DEBUG(0, ("invalid zero data params: off %lu, bfz, %lu\n",
 435                           (unsigned long)zdata_info.file_off,
 436                           (unsigned long)zdata_info.beyond_final_zero));
 437                 return NT_STATUS_INVALID_PARAMETER;
 438         }
 439
 440         /* convert strange "beyond final zero" param into length */
 441         len = zdata_info.beyond_final_zero - zdata_info.file_off;
 442
 443         if (len == 0) {
 444                 DEBUG(2, ("zero data called with zero length range\n"));
 445                 return NT_STATUS_OK;
 446         }
 447
 448         init_strict_lock_struct(fsp,
 449                                 fsp->op->global->open_persistent_id,
 450                                 zdata_info.file_off,
 451                                 len,
 452                                 WRITE_LOCK,
 453                                 &lck);
 454
 455         if (!SMB_VFS_STRICT_LOCK(fsp->conn, fsp, &lck)) {
 456                 DEBUG(2, ("failed to lock range for zero-data\n"));
 457                 return NT_STATUS_FILE_LOCK_CONFLICT;
 458         }
 459
 460         /*
 461          * MS-FSCC <58> Section 2.3.67
 462          * This FSCTL sets the range of bytes to zero (0) without extending the
 463          * file size.
 464          *
 465          * The VFS_FALLOCATE_FL_KEEP_SIZE flag is used to satisfy this
 466          * constraint.
 467          */
 468
 469         mode = VFS_FALLOCATE_FL_PUNCH_HOLE | VFS_FALLOCATE_FL_KEEP_SIZE;
 470         ret = SMB_VFS_FALLOCATE(fsp, mode, zdata_info.file_off, len);
 471         if (ret == -1)  {
 472                 status = map_nt_error_from_unix_common(errno);
 473                 DEBUG(2, ("zero-data fallocate(0x%x) failed: %s\n", mode,
 474                       strerror(errno)));
 475                 SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lck);
 476                 return status;
 477         }
 478
 479         if (!fsp->is_sparse && lp_strict_allocate(SNUM(fsp->conn))) {
 480                 /*
 481                  * File marked non-sparse and "strict allocate" is enabled -
 482                  * allocate the range that we just punched out.
 483                  * In future FALLOC_FL_ZERO_RANGE could be used exclusively for
 484                  * this, but it's currently only supported on XFS and ext4.
 485                  *
 486                  * The newly allocated range still won't be found by SEEK_DATA
 487                  * for QAR, but stat.st_blocks will reflect it.
 488                  */
 489                 ret = SMB_VFS_FALLOCATE(fsp, VFS_FALLOCATE_FL_KEEP_SIZE,
 490                                         zdata_info.file_off, len);
 491                 if (ret == -1)  {
 492                         status = map_nt_error_from_unix_common(errno);
 493                         DEBUG(0, ("fallocate failed: %s\n", strerror(errno)));
 494                         SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lck);
 495                         return status;
 496                 }
 497         }
 498
 499         SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lck);
 500         return NT_STATUS_OK;
 501 }
 502
 503 static NTSTATUS fsctl_qar_buf_push(TALLOC_CTX *mem_ctx,
 504                                    struct file_alloced_range_buf *qar_buf,
 505                                    DATA_BLOB *qar_array_blob)
 506 {
 507         DATA_BLOB new_slot;
 508         enum ndr_err_code ndr_ret;
 509         bool ok;
 510
 511         ndr_ret = ndr_push_struct_blob(&new_slot, mem_ctx, qar_buf,
 512                         (ndr_push_flags_fn_t)ndr_push_file_alloced_range_buf);
 513         if (ndr_ret != NDR_ERR_SUCCESS) {
 514                 DEBUG(0, ("failed to marshall QAR buf\n"));
 515                 return NT_STATUS_INVALID_PARAMETER;
 516         }
 517
 518         /* TODO should be able to avoid copy by pushing into prealloced buf */
 519         ok = data_blob_append(mem_ctx, qar_array_blob, new_slot.data,
 520                               new_slot.length);
 521         data_blob_free(&new_slot);
 522         if (!ok) {
 523                 return NT_STATUS_NO_MEMORY;
 524         }
 525
 526         return NT_STATUS_OK;
 527 }
 528
 529 static NTSTATUS fsctl_qar_seek_fill(TALLOC_CTX *mem_ctx,
 530                                     struct files_struct *fsp,
 531                                     off_t curr_off,
 532                                     off_t max_off,
 533                                     DATA_BLOB *qar_array_blob)
 534 {
 535         NTSTATUS status = NT_STATUS_NOT_SUPPORTED;
 536
 537 #ifdef HAVE_LSEEK_HOLE_DATA
 538         while (curr_off <= max_off) {
 539                 off_t data_off;
 540                 off_t hole_off;
 541                 struct file_alloced_range_buf qar_buf;
 542
 543                 /* seek next data */
 544                 data_off = SMB_VFS_LSEEK(fsp, curr_off, SEEK_DATA);
 545                 if ((data_off == -1) && (errno == ENXIO)) {
 546                         /* no data from curr_off to EOF */
 547                         break;
 548                 } else if (data_off == -1) {
 549                         status = map_nt_error_from_unix_common(errno);
 550                         DEBUG(1, ("lseek data failed: %s\n", strerror(errno)));
 551                         return status;
 552                 }
 553
 554                 if (data_off > max_off) {
 555                         /* found something, but passed range of interest */
 556                         break;
 557                 }
 558
 559                 hole_off = SMB_VFS_LSEEK(fsp, data_off, SEEK_HOLE);
 560                 if (hole_off == -1) {
 561                         status = map_nt_error_from_unix_common(errno);
 562                         DEBUG(1, ("lseek hole failed: %s\n", strerror(errno)));
 563                         return status;
 564                 }
 565
 566                 if (hole_off <= data_off) {
 567                         DEBUG(1, ("lseek inconsistent: hole %lu at or before "
 568                                   "data %lu\n", (unsigned long)hole_off,
 569                                   (unsigned long)data_off));
 570                         return NT_STATUS_INTERNAL_ERROR;
 571                 }
 572
 573                 qar_buf.file_off = data_off;
 574                 /* + 1 to convert maximum offset to length */
 575                 qar_buf.len = MIN(hole_off, max_off + 1) - data_off;
 576
 577                 status = fsctl_qar_buf_push(mem_ctx, &qar_buf, qar_array_blob);
 578                 if (!NT_STATUS_IS_OK(status)) {
 579                         return NT_STATUS_NO_MEMORY;
 580                 }
 581
 582                 curr_off = hole_off;
 583         }
 584         status = NT_STATUS_OK;
 585 #endif
 586
 587         return status;
 588 }
 589
 590 static NTSTATUS fsctl_qar(TALLOC_CTX *mem_ctx,
 591                           struct tevent_context *ev,
 592                           struct files_struct *fsp,
 593                           DATA_BLOB *in_input,
 594                           size_t in_max_output,
 595                           DATA_BLOB *out_output)
 596 {
 597         struct fsctl_query_alloced_ranges_req qar_req;
 598         struct fsctl_query_alloced_ranges_rsp qar_rsp;
 599         DATA_BLOB qar_array_blob = data_blob_null;
 600         uint64_t max_off;
 601         enum ndr_err_code ndr_ret;
 602         int ret;
 603         NTSTATUS status;
 604         SMB_STRUCT_STAT sbuf;
 605
 606         if (fsp == NULL) {
 607                 return NT_STATUS_FILE_CLOSED;
 608         }
 609
 610         /* READ_DATA permission is required */
 611         status = check_access_fsp(fsp, FILE_READ_DATA);
 612         if (!NT_STATUS_IS_OK(status)) {
 613                 return status;
 614         }
 615
 616         ndr_ret = ndr_pull_struct_blob(in_input, mem_ctx, &qar_req,
 617                 (ndr_pull_flags_fn_t)ndr_pull_fsctl_query_alloced_ranges_req);
 618         if (ndr_ret != NDR_ERR_SUCCESS) {
 619                 DEBUG(0, ("failed to unmarshall QAR req\n"));
 620                 return NT_STATUS_INVALID_PARAMETER;
 621         }
 622
 623         /*
 624          * XXX Windows Server 2008 & 2012 servers don't return lock-conflict
 625          * for QAR requests over an exclusively locked range!
 626          */
 627
 628         ret = SMB_VFS_FSTAT(fsp, &sbuf);
 629         if (ret == -1) {
 630                 status = map_nt_error_from_unix_common(errno);
 631                 DEBUG(2, ("fstat failed: %s\n", strerror(errno)));
 632                 return status;
 633         }
 634
 635         if ((qar_req.buf.len == 0)
 636          || (sbuf.st_ex_size == 0)
 637          || (qar_req.buf.file_off >= sbuf.st_ex_size)) {
 638                 /* zero length range or after EOF, no ranges to return */
 639                 return NT_STATUS_OK;
 640         }
 641
 642         /* check for integer overflow */
 643         if (qar_req.buf.file_off + qar_req.buf.len < qar_req.buf.file_off) {
 644                 return NT_STATUS_INVALID_PARAMETER;
 645         }
 646
 647         /*
 648          * Maximum offset is either the last valid offset _before_ EOF, or the
 649          * last byte offset within the requested range. -1 converts length to
 650          * offset, which is easier to work with for SEEK_DATA/SEEK_HOLE, E.g.:
 651          *
 652          * /off=0             /off=512K          /st_ex_size=1M
 653          * |-------------------------------------|
 654          * | File data                           |
 655          * |-------------------------------------|
 656          *                                                   QAR end\
 657          *                    |=====================================|
 658          *                    |    QAR off=512K, len=1M             |
 659          *                    |=================^===================|
 660          *                                   max_off=1M - 1
 661          *             QAR end\
 662          * |==================|
 663          * |QAR off=0 len=512K|
 664          * |==================|
 665          *                   ^
 666          *                max_off=512K - 1
 667          */
 668         max_off = MIN(sbuf.st_ex_size,
 669                       qar_req.buf.file_off + qar_req.buf.len) - 1;
 670
 671         if (!fsp->is_sparse) {
 672                 struct file_alloced_range_buf qar_buf;
 673
 674                 /* file is non-sparse, claim file_off->max_off is allocated */
 675                 qar_buf.file_off = qar_req.buf.file_off;
 676                 /* + 1 to convert maximum offset back to length */
 677                 qar_buf.len = max_off - qar_req.buf.file_off + 1;
 678
 679                 status = fsctl_qar_buf_push(mem_ctx, &qar_buf, &qar_array_blob);
 680         } else {
 681                 status = fsctl_qar_seek_fill(mem_ctx, fsp, qar_req.buf.file_off,
 682                                              max_off, &qar_array_blob);
 683         }
 684         if (!NT_STATUS_IS_OK(status)) {
 685                 return status;
 686         }
 687
 688         /* marshall response buffer. */
 689         qar_rsp.far_buf_array = qar_array_blob;
 690
 691         ndr_ret = ndr_push_struct_blob(out_output, mem_ctx, &qar_rsp,
 692                 (ndr_push_flags_fn_t)ndr_push_fsctl_query_alloced_ranges_rsp);
 693         if (ndr_ret != NDR_ERR_SUCCESS) {
 694                 DEBUG(0, ("failed to marshall QAR rsp\n"));
 695                 return NT_STATUS_INVALID_PARAMETER;
 696         }
 697
 698         if (out_output->length > in_max_output) {
 699                 DEBUG(2, ("QAR output len %lu exceeds max %lu\n",
 700                           (unsigned long)out_output->length,
 701                           (unsigned long)in_max_output));
 702                 data_blob_free(out_output);
 703                 return NT_STATUS_BUFFER_TOO_SMALL;
 704         }
 705
 706         return NT_STATUS_OK;
 707 }
 708
 709 static void smb2_ioctl_filesys_dup_extents_done(struct tevent_req *subreq);
 710
 711 struct tevent_req *smb2_ioctl_filesys(uint32_t ctl_code,
 712                                       struct tevent_context *ev,
 713                                       struct tevent_req *req,
 714                                       struct smbd_smb2_ioctl_state *state)
 715 {
 716         NTSTATUS status;
 717
 718         switch (ctl_code) {
 719         case FSCTL_GET_COMPRESSION:
 720                 status = fsctl_get_cmprn(state, ev, state->fsp,
 721                                          state->in_max_output,
 722                                          &state->out_output);
 723                 if (!tevent_req_nterror(req, status)) {
 724                         tevent_req_done(req);
 725                 }
 726                 return tevent_req_post(req, ev);
 727                 break;
 728         case FSCTL_SET_COMPRESSION:
 729                 status = fsctl_set_cmprn(state, ev, state->fsp,
 730                                          &state->in_input);
 731                 if (!tevent_req_nterror(req, status)) {
 732                         tevent_req_done(req);
 733                 }
 734                 return tevent_req_post(req, ev);
 735                 break;
 736         case FSCTL_SET_ZERO_DATA:
 737                 status = fsctl_zero_data(state, ev, state->fsp,
 738                                          &state->in_input);
 739                 if (!tevent_req_nterror(req, status)) {
 740                         tevent_req_done(req);
 741                 }
 742                 return tevent_req_post(req, ev);
 743                 break;
 744         case FSCTL_QUERY_ALLOCATED_RANGES:
 745                 status = fsctl_qar(state, ev, state->fsp,
 746                                    &state->in_input,
 747                                    state->in_max_output,
 748                                    &state->out_output);
 749                 if (!tevent_req_nterror(req, status)) {
 750                         tevent_req_done(req);
 751                 }
 752                 return tevent_req_post(req, ev);
 753                 break;
 754         case FSCTL_DUP_EXTENTS_TO_FILE: {
 755                 struct tevent_req *subreq = NULL;
 756
 757                 subreq = fsctl_dup_extents_send(state, ev,
 758                                                 state->fsp,
 759                                                 &state->in_input,
 760                                                 state->smb2req);
 761                 if (tevent_req_nomem(subreq, req)) {
 762                         return tevent_req_post(req, ev);
 763                 }
 764                 tevent_req_set_callback(subreq,
 765                                         smb2_ioctl_filesys_dup_extents_done,
 766                                         req);
 767                 return req;
 768                 break;
 769         }
 770         default: {
 771                 uint8_t *out_data = NULL;
 772                 uint32_t out_data_len = 0;
 773
 774                 if (state->fsp == NULL) {
 775                         status = NT_STATUS_NOT_SUPPORTED;
 776                 } else {
 777                         status = SMB_VFS_FSCTL(state->fsp,
 778                                                state,
 779                                                ctl_code,
 780                                                state->smbreq->flags2,
 781                                                state->in_input.data,
 782                                                state->in_input.length,
 783                                                &out_data,
 784                                                state->in_max_output,
 785                                                &out_data_len);
 786                         state->out_output = data_blob_const(out_data, out_data_len);
 787                         if (NT_STATUS_IS_OK(status)) {
 788                                 tevent_req_done(req);
 789                                 return tevent_req_post(req, ev);
 790                         }
 791                 }
 792
 793                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 794                         if (IS_IPC(state->smbreq->conn)) {
 795                                 status = NT_STATUS_FS_DRIVER_REQUIRED;
 796                         } else {
 797                                 status = NT_STATUS_INVALID_DEVICE_REQUEST;
 798                         }
 799                 }
 800
 801                 tevent_req_nterror(req, status);
 802                 return tevent_req_post(req, ev);
 803                 break;
 804         }
 805         }
 806
 807         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 808         return tevent_req_post(req, ev);
 809 }
 810
 811 static void smb2_ioctl_filesys_dup_extents_done(struct tevent_req *subreq)
 812 {
 813         struct tevent_req *req = tevent_req_callback_data(subreq,
 814                                                           struct tevent_req);
 815         NTSTATUS status;
 816
 817         status = fsctl_dup_extents_recv(subreq);
 818         TALLOC_FREE(subreq);
 819         if (!tevent_req_nterror(req, status)) {
 820                 tevent_req_done(req);
 821         }
 822 }