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 files_struct *src_fsp;
 165         struct files_struct *dst_fsp;
 166         struct fsctl_dup_extents_to_file dup_extents;
 167 };
 168
 169 static void fsctl_dup_extents_offload_read_done(struct tevent_req *subreq);
 170 static void fsctl_dup_extents_vfs_done(struct tevent_req *subreq);
 171
 172 static struct tevent_req *fsctl_dup_extents_send(TALLOC_CTX *mem_ctx,
 173                                                  struct tevent_context *ev,
 174                                                  struct files_struct *dst_fsp,
 175                                                  DATA_BLOB *in_input,
 176                                                  struct smbd_smb2_request *smb2req)
 177 {
 178         struct tevent_req *req = NULL;
 179         struct tevent_req *subreq = NULL;
 180         struct fsctl_dup_extents_state *state = NULL;
 181         uint64_t src_fid_persistent = 0;
 182         uint64_t src_fid_volatile = 0;
 183         struct files_struct *src_fsp = NULL;
 184         int ndr_ret;
 185         NTSTATUS status;
 186
 187         req = tevent_req_create(mem_ctx, &state,
 188                                 struct fsctl_dup_extents_state);
 189         if (req == NULL) {
 190                 return NULL;
 191         }
 192
 193         if (dst_fsp == NULL) {
 194                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 195                 return tevent_req_post(req, ev);
 196         }
 197
 198         *state = (struct fsctl_dup_extents_state) {
 199                 .conn = dst_fsp->conn,
 200                 .ev = ev,
 201                 .dst_fsp = dst_fsp,
 202         };
 203
 204         if ((dst_fsp->conn->fs_capabilities
 205                                 & FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0) {
 206                 DBG_INFO("FS does not advertise block refcounting support\n");
 207                 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 208                 return tevent_req_post(req, ev);
 209         }
 210
 211         ndr_ret = ndr_pull_struct_blob(in_input, state, &state->dup_extents,
 212                        (ndr_pull_flags_fn_t)ndr_pull_fsctl_dup_extents_to_file);
 213         if (ndr_ret != NDR_ERR_SUCCESS) {
 214                 DBG_ERR("failed to unmarshall dup extents to file req\n");
 215                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 216                 return tevent_req_post(req, ev);
 217         }
 218
 219         src_fid_persistent = BVAL(state->dup_extents.source_fid, 0);
 220         src_fid_volatile = BVAL(state->dup_extents.source_fid, 8);
 221         src_fsp = file_fsp_get(smb2req, src_fid_persistent, src_fid_volatile);
 222         if ((src_fsp == NULL)
 223                       || (src_fsp->file_id.devid != dst_fsp->file_id.devid)) {
 224                 /*
 225                  * [MS-FSCC] 2.3.8 FSCTL_DUPLICATE_EXTENTS_TO_FILE Reply
 226                  * STATUS_INVALID_PARAMETER:
 227                  * The FileHandle parameter is either invalid or does not
 228                  * represent a handle to an opened file on the same volume.
 229                  *
 230                  * Windows Server responds with NT_STATUS_INVALID_HANDLE instead
 231                  * of STATUS_INVALID_PARAMETER here, despite the above spec.
 232                  */
 233                 DBG_ERR("invalid src_fsp for dup_extents\n");
 234                 tevent_req_nterror(req, NT_STATUS_INVALID_HANDLE);
 235                 return tevent_req_post(req, ev);
 236         }
 237         state->src_fsp = src_fsp;
 238
 239         status = fsctl_dup_extents_check_lengths(src_fsp, dst_fsp,
 240                                                  &state->dup_extents);
 241         if (!NT_STATUS_IS_OK(status)) {
 242                 tevent_req_nterror(req, status);
 243                 return tevent_req_post(req, ev);
 244         }
 245
 246         if (state->dup_extents.byte_count == 0) {
 247                 DBG_ERR("skipping zero length dup extents\n");
 248                 tevent_req_done(req);
 249                 return tevent_req_post(req, ev);
 250         }
 251
 252         status = fsctl_dup_extents_check_overlap(src_fsp, dst_fsp,
 253                                                  &state->dup_extents);
 254         if (!NT_STATUS_IS_OK(status)) {
 255                 tevent_req_nterror(req, status);
 256                 return tevent_req_post(req, ev);
 257         }
 258
 259         status = fsctl_dup_extents_check_sparse(src_fsp, dst_fsp);
 260         if (!NT_STATUS_IS_OK(status)) {
 261                 tevent_req_nterror(req, status);
 262                 return tevent_req_post(req, ev);
 263         }
 264
 265         subreq = SMB_VFS_OFFLOAD_READ_SEND(state, ev, src_fsp,
 266                                            FSCTL_DUP_EXTENTS_TO_FILE,
 267                                            0, 0, 0);
 268         if (tevent_req_nomem(subreq, req)) {
 269                 return tevent_req_post(req, ev);
 270         }
 271         tevent_req_set_callback(subreq, fsctl_dup_extents_offload_read_done,
 272                                 req);
 273         return req;
 274 }
 275
 276 static void fsctl_dup_extents_offload_read_done(struct tevent_req *subreq)
 277 {
 278         struct tevent_req *req = tevent_req_callback_data(
 279                 subreq, struct tevent_req);
 280         struct fsctl_dup_extents_state *state = tevent_req_data(
 281                 req, struct fsctl_dup_extents_state);
 282         DATA_BLOB token_blob;
 283         NTSTATUS status;
 284
 285         status = SMB_VFS_OFFLOAD_READ_RECV(subreq, state->dst_fsp->conn,
 286                                            state, &token_blob);
 287         if (tevent_req_nterror(req, status)) {
 288                 return;
 289         }
 290
 291         /* tell the VFS to ignore locks across the clone, matching ReFS */
 292         subreq = SMB_VFS_OFFLOAD_WRITE_SEND(state->dst_fsp->conn,
 293                                             state,
 294                                             state->ev,
 295                                             state->src_fsp,
 296                                             state->dup_extents.source_off,
 297                                             state->dst_fsp,
 298                                             state->dup_extents.target_off,
 299                                             state->dup_extents.byte_count,
 300                                             VFS_OFFLOAD_WRITE_FL_MUST_CLONE
 301                                             | VFS_OFFLOAD_WRITE_FL_IGNORE_LOCKS);
 302         if (tevent_req_nomem(subreq, req)) {
 303                 return;
 304         }
 305         tevent_req_set_callback(subreq, fsctl_dup_extents_vfs_done, req);
 306         return;
 307 }
 308
 309 static void fsctl_dup_extents_vfs_done(struct tevent_req *subreq)
 310 {
 311         struct tevent_req *req = tevent_req_callback_data(
 312                 subreq, struct tevent_req);
 313         struct fsctl_dup_extents_state *state = tevent_req_data(
 314                 req, struct fsctl_dup_extents_state);
 315         off_t nb_chunk;
 316         NTSTATUS status;
 317
 318         status = SMB_VFS_OFFLOAD_WRITE_RECV(state->conn, subreq, &nb_chunk);
 319         TALLOC_FREE(subreq);
 320         if (tevent_req_nterror(req, status)) {
 321                 return;
 322         }
 323
 324         if (nb_chunk != state->dup_extents.byte_count) {
 325                 tevent_req_nterror(req, NT_STATUS_IO_DEVICE_ERROR);
 326                 return;
 327         }
 328
 329         tevent_req_done(req);
 330 }
 331
 332 static NTSTATUS fsctl_dup_extents_recv(struct tevent_req *req)
 333 {
 334         return tevent_req_simple_recv_ntstatus(req);
 335 }
 336
 337 static NTSTATUS fsctl_get_cmprn(TALLOC_CTX *mem_ctx,
 338                                 struct tevent_context *ev,
 339                                 struct files_struct *fsp,
 340                                 size_t in_max_output,
 341                                 DATA_BLOB *out_output)
 342 {
 343         struct compression_state cmpr_state;
 344         enum ndr_err_code ndr_ret;
 345         DATA_BLOB output;
 346         NTSTATUS status;
 347
 348         if (fsp == NULL) {
 349                 return NT_STATUS_FILE_CLOSED;
 350         }
 351
 352         /* Windows doesn't check for SEC_FILE_READ_ATTRIBUTE permission here */
 353
 354         ZERO_STRUCT(cmpr_state);
 355         if (fsp->conn->fs_capabilities & FILE_FILE_COMPRESSION) {
 356                 status = SMB_VFS_GET_COMPRESSION(fsp->conn,
 357                                                  mem_ctx,
 358                                                  fsp,
 359                                                  NULL,
 360                                                  &cmpr_state.format);
 361                 if (!NT_STATUS_IS_OK(status)) {
 362                         return status;
 363                 }
 364         } else {
 365                 /*
 366                  * bso#12144: The underlying filesystem doesn't support
 367                  * compression, so we should respond with "not-compressed"
 368                  * (like WS2016 ReFS) instead of STATUS_NOT_SUPPORTED or
 369                  * NT_STATUS_INVALID_DEVICE_REQUEST.
 370                  */
 371                 cmpr_state.format = COMPRESSION_FORMAT_NONE;
 372         }
 373
 374         ndr_ret = ndr_push_struct_blob(&output, mem_ctx,
 375                                        &cmpr_state,
 376                         (ndr_push_flags_fn_t)ndr_push_compression_state);
 377         if (ndr_ret != NDR_ERR_SUCCESS) {
 378                 return NT_STATUS_INTERNAL_ERROR;
 379         }
 380
 381         if (in_max_output < output.length) {
 382                 DEBUG(1, ("max output %u too small for compression state %ld\n",
 383                       (unsigned int)in_max_output, (long int)output.length));
 384                 return NT_STATUS_INVALID_USER_BUFFER;
 385         }
 386         *out_output = output;
 387
 388         return NT_STATUS_OK;
 389 }
 390
 391 static NTSTATUS fsctl_set_cmprn(TALLOC_CTX *mem_ctx,
 392                                 struct tevent_context *ev,
 393                                 struct files_struct *fsp,
 394                                 DATA_BLOB *in_input)
 395 {
 396         struct compression_state cmpr_state;
 397         enum ndr_err_code ndr_ret;
 398         NTSTATUS status;
 399
 400         if (fsp == NULL) {
 401                 return NT_STATUS_FILE_CLOSED;
 402         }
 403
 404         /* WRITE_DATA permission is required, WRITE_ATTRIBUTES is not */
 405         status = check_access_fsp(fsp, FILE_WRITE_DATA);
 406         if (!NT_STATUS_IS_OK(status)) {
 407                 return status;
 408         }
 409
 410         ndr_ret = ndr_pull_struct_blob(in_input, mem_ctx, &cmpr_state,
 411                         (ndr_pull_flags_fn_t)ndr_pull_compression_state);
 412         if (ndr_ret != NDR_ERR_SUCCESS) {
 413                 DEBUG(0, ("failed to unmarshall set compression req\n"));
 414                 return NT_STATUS_INVALID_PARAMETER;
 415         }
 416
 417         status = NT_STATUS_NOT_SUPPORTED;
 418         if (fsp->conn->fs_capabilities & FILE_FILE_COMPRESSION) {
 419                 status = SMB_VFS_SET_COMPRESSION(fsp->conn,
 420                                                  mem_ctx,
 421                                                  fsp,
 422                                                  cmpr_state.format);
 423         } else if (cmpr_state.format == COMPRESSION_FORMAT_NONE) {
 424                 /*
 425                  * bso#12144: The underlying filesystem doesn't support
 426                  * compression. We should still accept set(FORMAT_NONE) requests
 427                  * (like WS2016 ReFS).
 428                  */
 429                 status = NT_STATUS_OK;
 430         }
 431
 432         return status;
 433 }
 434
 435 static NTSTATUS fsctl_zero_data(TALLOC_CTX *mem_ctx,
 436                                 struct tevent_context *ev,
 437                                 struct files_struct *fsp,
 438                                 DATA_BLOB *in_input)
 439 {
 440         struct file_zero_data_info zdata_info;
 441         enum ndr_err_code ndr_ret;
 442         struct lock_struct lck;
 443         int mode;
 444         uint64_t len;
 445         int ret;
 446         NTSTATUS status;
 447
 448         if (fsp == NULL) {
 449                 return NT_STATUS_FILE_CLOSED;
 450         }
 451
 452         /* WRITE_DATA permission is required */
 453         status = check_access_fsp(fsp, FILE_WRITE_DATA);
 454         if (!NT_STATUS_IS_OK(status)) {
 455                 return status;
 456         }
 457
 458         /* allow regardless of whether FS supports sparse or not */
 459
 460         ndr_ret = ndr_pull_struct_blob(in_input, mem_ctx, &zdata_info,
 461                         (ndr_pull_flags_fn_t)ndr_pull_file_zero_data_info);
 462         if (ndr_ret != NDR_ERR_SUCCESS) {
 463                 DEBUG(0, ("failed to unmarshall zero data request\n"));
 464                 return NT_STATUS_INVALID_PARAMETER;
 465         }
 466
 467         if (zdata_info.beyond_final_zero < zdata_info.file_off) {
 468                 DEBUG(0, ("invalid zero data params: off %lu, bfz, %lu\n",
 469                           (unsigned long)zdata_info.file_off,
 470                           (unsigned long)zdata_info.beyond_final_zero));
 471                 return NT_STATUS_INVALID_PARAMETER;
 472         }
 473
 474         /* convert strange "beyond final zero" param into length */
 475         len = zdata_info.beyond_final_zero - zdata_info.file_off;
 476
 477         if (len == 0) {
 478                 DEBUG(2, ("zero data called with zero length range\n"));
 479                 return NT_STATUS_OK;
 480         }
 481
 482         init_strict_lock_struct(fsp,
 483                                 fsp->op->global->open_persistent_id,
 484                                 zdata_info.file_off,
 485                                 len,
 486                                 WRITE_LOCK,
 487                                 &lck);
 488
 489         if (!SMB_VFS_STRICT_LOCK(fsp->conn, fsp, &lck)) {
 490                 DEBUG(2, ("failed to lock range for zero-data\n"));
 491                 return NT_STATUS_FILE_LOCK_CONFLICT;
 492         }
 493
 494         /*
 495          * MS-FSCC <58> Section 2.3.67
 496          * This FSCTL sets the range of bytes to zero (0) without extending the
 497          * file size.
 498          *
 499          * The VFS_FALLOCATE_FL_KEEP_SIZE flag is used to satisfy this
 500          * constraint.
 501          */
 502
 503         mode = VFS_FALLOCATE_FL_PUNCH_HOLE | VFS_FALLOCATE_FL_KEEP_SIZE;
 504         ret = SMB_VFS_FALLOCATE(fsp, mode, zdata_info.file_off, len);
 505         if (ret == -1)  {
 506                 status = map_nt_error_from_unix_common(errno);
 507                 DEBUG(2, ("zero-data fallocate(0x%x) failed: %s\n", mode,
 508                       strerror(errno)));
 509                 SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lck);
 510                 return status;
 511         }
 512
 513         if (!fsp->is_sparse && lp_strict_allocate(SNUM(fsp->conn))) {
 514                 /*
 515                  * File marked non-sparse and "strict allocate" is enabled -
 516                  * allocate the range that we just punched out.
 517                  * In future FALLOC_FL_ZERO_RANGE could be used exclusively for
 518                  * this, but it's currently only supported on XFS and ext4.
 519                  *
 520                  * The newly allocated range still won't be found by SEEK_DATA
 521                  * for QAR, but stat.st_blocks will reflect it.
 522                  */
 523                 ret = SMB_VFS_FALLOCATE(fsp, VFS_FALLOCATE_FL_KEEP_SIZE,
 524                                         zdata_info.file_off, len);
 525                 if (ret == -1)  {
 526                         status = map_nt_error_from_unix_common(errno);
 527                         DEBUG(0, ("fallocate failed: %s\n", strerror(errno)));
 528                         SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lck);
 529                         return status;
 530                 }
 531         }
 532
 533         SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lck);
 534         return NT_STATUS_OK;
 535 }
 536
 537 static NTSTATUS fsctl_qar_buf_push(TALLOC_CTX *mem_ctx,
 538                                    struct file_alloced_range_buf *qar_buf,
 539                                    DATA_BLOB *qar_array_blob)
 540 {
 541         DATA_BLOB new_slot;
 542         enum ndr_err_code ndr_ret;
 543         bool ok;
 544
 545         ndr_ret = ndr_push_struct_blob(&new_slot, mem_ctx, qar_buf,
 546                         (ndr_push_flags_fn_t)ndr_push_file_alloced_range_buf);
 547         if (ndr_ret != NDR_ERR_SUCCESS) {
 548                 DEBUG(0, ("failed to marshall QAR buf\n"));
 549                 return NT_STATUS_INVALID_PARAMETER;
 550         }
 551
 552         /* TODO should be able to avoid copy by pushing into prealloced buf */
 553         ok = data_blob_append(mem_ctx, qar_array_blob, new_slot.data,
 554                               new_slot.length);
 555         data_blob_free(&new_slot);
 556         if (!ok) {
 557                 return NT_STATUS_NO_MEMORY;
 558         }
 559
 560         return NT_STATUS_OK;
 561 }
 562
 563 static NTSTATUS fsctl_qar_seek_fill(TALLOC_CTX *mem_ctx,
 564                                     struct files_struct *fsp,
 565                                     off_t curr_off,
 566                                     off_t max_off,
 567                                     DATA_BLOB *qar_array_blob)
 568 {
 569         NTSTATUS status = NT_STATUS_NOT_SUPPORTED;
 570
 571 #ifdef HAVE_LSEEK_HOLE_DATA
 572         while (curr_off <= max_off) {
 573                 off_t data_off;
 574                 off_t hole_off;
 575                 struct file_alloced_range_buf qar_buf;
 576
 577                 /* seek next data */
 578                 data_off = SMB_VFS_LSEEK(fsp, curr_off, SEEK_DATA);
 579                 if ((data_off == -1) && (errno == ENXIO)) {
 580                         /* no data from curr_off to EOF */
 581                         break;
 582                 } else if (data_off == -1) {
 583                         status = map_nt_error_from_unix_common(errno);
 584                         DEBUG(1, ("lseek data failed: %s\n", strerror(errno)));
 585                         return status;
 586                 }
 587
 588                 if (data_off > max_off) {
 589                         /* found something, but passed range of interest */
 590                         break;
 591                 }
 592
 593                 hole_off = SMB_VFS_LSEEK(fsp, data_off, SEEK_HOLE);
 594                 if (hole_off == -1) {
 595                         status = map_nt_error_from_unix_common(errno);
 596                         DEBUG(1, ("lseek hole failed: %s\n", strerror(errno)));
 597                         return status;
 598                 }
 599
 600                 if (hole_off <= data_off) {
 601                         DEBUG(1, ("lseek inconsistent: hole %lu at or before "
 602                                   "data %lu\n", (unsigned long)hole_off,
 603                                   (unsigned long)data_off));
 604                         return NT_STATUS_INTERNAL_ERROR;
 605                 }
 606
 607                 qar_buf.file_off = data_off;
 608                 /* + 1 to convert maximum offset to length */
 609                 qar_buf.len = MIN(hole_off, max_off + 1) - data_off;
 610
 611                 status = fsctl_qar_buf_push(mem_ctx, &qar_buf, qar_array_blob);
 612                 if (!NT_STATUS_IS_OK(status)) {
 613                         return NT_STATUS_NO_MEMORY;
 614                 }
 615
 616                 curr_off = hole_off;
 617         }
 618         status = NT_STATUS_OK;
 619 #endif
 620
 621         return status;
 622 }
 623
 624 static NTSTATUS fsctl_qar(TALLOC_CTX *mem_ctx,
 625                           struct tevent_context *ev,
 626                           struct files_struct *fsp,
 627                           DATA_BLOB *in_input,
 628                           size_t in_max_output,
 629                           DATA_BLOB *out_output)
 630 {
 631         struct fsctl_query_alloced_ranges_req qar_req;
 632         struct fsctl_query_alloced_ranges_rsp qar_rsp;
 633         DATA_BLOB qar_array_blob = data_blob_null;
 634         uint64_t max_off;
 635         enum ndr_err_code ndr_ret;
 636         int ret;
 637         NTSTATUS status;
 638         SMB_STRUCT_STAT sbuf;
 639
 640         if (fsp == NULL) {
 641                 return NT_STATUS_FILE_CLOSED;
 642         }
 643
 644         /* READ_DATA permission is required */
 645         status = check_access_fsp(fsp, FILE_READ_DATA);
 646         if (!NT_STATUS_IS_OK(status)) {
 647                 return status;
 648         }
 649
 650         ndr_ret = ndr_pull_struct_blob(in_input, mem_ctx, &qar_req,
 651                 (ndr_pull_flags_fn_t)ndr_pull_fsctl_query_alloced_ranges_req);
 652         if (ndr_ret != NDR_ERR_SUCCESS) {
 653                 DEBUG(0, ("failed to unmarshall QAR req\n"));
 654                 return NT_STATUS_INVALID_PARAMETER;
 655         }
 656
 657         /*
 658          * XXX Windows Server 2008 & 2012 servers don't return lock-conflict
 659          * for QAR requests over an exclusively locked range!
 660          */
 661
 662         ret = SMB_VFS_FSTAT(fsp, &sbuf);
 663         if (ret == -1) {
 664                 status = map_nt_error_from_unix_common(errno);
 665                 DEBUG(2, ("fstat failed: %s\n", strerror(errno)));
 666                 return status;
 667         }
 668
 669         if ((qar_req.buf.len == 0)
 670          || (sbuf.st_ex_size == 0)
 671          || (qar_req.buf.file_off >= sbuf.st_ex_size)) {
 672                 /* zero length range or after EOF, no ranges to return */
 673                 return NT_STATUS_OK;
 674         }
 675
 676         /* check for integer overflow */
 677         if (qar_req.buf.file_off + qar_req.buf.len < qar_req.buf.file_off) {
 678                 return NT_STATUS_INVALID_PARAMETER;
 679         }
 680
 681         /*
 682          * Maximum offset is either the last valid offset _before_ EOF, or the
 683          * last byte offset within the requested range. -1 converts length to
 684          * offset, which is easier to work with for SEEK_DATA/SEEK_HOLE, E.g.:
 685          *
 686          * /off=0             /off=512K          /st_ex_size=1M
 687          * |-------------------------------------|
 688          * | File data                           |
 689          * |-------------------------------------|
 690          *                                                   QAR end\
 691          *                    |=====================================|
 692          *                    |    QAR off=512K, len=1M             |
 693          *                    |=================^===================|
 694          *                                   max_off=1M - 1
 695          *             QAR end\
 696          * |==================|
 697          * |QAR off=0 len=512K|
 698          * |==================|
 699          *                   ^
 700          *                max_off=512K - 1
 701          */
 702         max_off = MIN(sbuf.st_ex_size,
 703                       qar_req.buf.file_off + qar_req.buf.len) - 1;
 704
 705         if (!fsp->is_sparse) {
 706                 struct file_alloced_range_buf qar_buf;
 707
 708                 /* file is non-sparse, claim file_off->max_off is allocated */
 709                 qar_buf.file_off = qar_req.buf.file_off;
 710                 /* + 1 to convert maximum offset back to length */
 711                 qar_buf.len = max_off - qar_req.buf.file_off + 1;
 712
 713                 status = fsctl_qar_buf_push(mem_ctx, &qar_buf, &qar_array_blob);
 714         } else {
 715                 status = fsctl_qar_seek_fill(mem_ctx, fsp, qar_req.buf.file_off,
 716                                              max_off, &qar_array_blob);
 717         }
 718         if (!NT_STATUS_IS_OK(status)) {
 719                 return status;
 720         }
 721
 722         /* marshall response buffer. */
 723         qar_rsp.far_buf_array = qar_array_blob;
 724
 725         ndr_ret = ndr_push_struct_blob(out_output, mem_ctx, &qar_rsp,
 726                 (ndr_push_flags_fn_t)ndr_push_fsctl_query_alloced_ranges_rsp);
 727         if (ndr_ret != NDR_ERR_SUCCESS) {
 728                 DEBUG(0, ("failed to marshall QAR rsp\n"));
 729                 return NT_STATUS_INVALID_PARAMETER;
 730         }
 731
 732         if (out_output->length > in_max_output) {
 733                 DEBUG(2, ("QAR output len %lu exceeds max %lu\n",
 734                           (unsigned long)out_output->length,
 735                           (unsigned long)in_max_output));
 736                 data_blob_free(out_output);
 737                 return NT_STATUS_BUFFER_TOO_SMALL;
 738         }
 739
 740         return NT_STATUS_OK;
 741 }
 742
 743 static void smb2_ioctl_filesys_dup_extents_done(struct tevent_req *subreq);
 744
 745 struct tevent_req *smb2_ioctl_filesys(uint32_t ctl_code,
 746                                       struct tevent_context *ev,
 747                                       struct tevent_req *req,
 748                                       struct smbd_smb2_ioctl_state *state)
 749 {
 750         NTSTATUS status;
 751
 752         switch (ctl_code) {
 753         case FSCTL_GET_COMPRESSION:
 754                 status = fsctl_get_cmprn(state, ev, state->fsp,
 755                                          state->in_max_output,
 756                                          &state->out_output);
 757                 if (!tevent_req_nterror(req, status)) {
 758                         tevent_req_done(req);
 759                 }
 760                 return tevent_req_post(req, ev);
 761                 break;
 762         case FSCTL_SET_COMPRESSION:
 763                 status = fsctl_set_cmprn(state, ev, state->fsp,
 764                                          &state->in_input);
 765                 if (!tevent_req_nterror(req, status)) {
 766                         tevent_req_done(req);
 767                 }
 768                 return tevent_req_post(req, ev);
 769                 break;
 770         case FSCTL_SET_ZERO_DATA:
 771                 status = fsctl_zero_data(state, ev, state->fsp,
 772                                          &state->in_input);
 773                 if (!tevent_req_nterror(req, status)) {
 774                         tevent_req_done(req);
 775                 }
 776                 return tevent_req_post(req, ev);
 777                 break;
 778         case FSCTL_QUERY_ALLOCATED_RANGES:
 779                 status = fsctl_qar(state, ev, state->fsp,
 780                                    &state->in_input,
 781                                    state->in_max_output,
 782                                    &state->out_output);
 783                 if (!tevent_req_nterror(req, status)) {
 784                         tevent_req_done(req);
 785                 }
 786                 return tevent_req_post(req, ev);
 787                 break;
 788         case FSCTL_DUP_EXTENTS_TO_FILE: {
 789                 struct tevent_req *subreq = NULL;
 790
 791                 subreq = fsctl_dup_extents_send(state, ev,
 792                                                 state->fsp,
 793                                                 &state->in_input,
 794                                                 state->smb2req);
 795                 if (tevent_req_nomem(subreq, req)) {
 796                         return tevent_req_post(req, ev);
 797                 }
 798                 tevent_req_set_callback(subreq,
 799                                         smb2_ioctl_filesys_dup_extents_done,
 800                                         req);
 801                 return req;
 802                 break;
 803         }
 804         default: {
 805                 uint8_t *out_data = NULL;
 806                 uint32_t out_data_len = 0;
 807
 808                 if (state->fsp == NULL) {
 809                         status = NT_STATUS_NOT_SUPPORTED;
 810                 } else {
 811                         status = SMB_VFS_FSCTL(state->fsp,
 812                                                state,
 813                                                ctl_code,
 814                                                state->smbreq->flags2,
 815                                                state->in_input.data,
 816                                                state->in_input.length,
 817                                                &out_data,
 818                                                state->in_max_output,
 819                                                &out_data_len);
 820                         state->out_output = data_blob_const(out_data, out_data_len);
 821                         if (NT_STATUS_IS_OK(status)) {
 822                                 tevent_req_done(req);
 823                                 return tevent_req_post(req, ev);
 824                         }
 825                 }
 826
 827                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 828                         if (IS_IPC(state->smbreq->conn)) {
 829                                 status = NT_STATUS_FS_DRIVER_REQUIRED;
 830                         } else {
 831                                 status = NT_STATUS_INVALID_DEVICE_REQUEST;
 832                         }
 833                 }
 834
 835                 tevent_req_nterror(req, status);
 836                 return tevent_req_post(req, ev);
 837                 break;
 838         }
 839         }
 840
 841         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 842         return tevent_req_post(req, ev);
 843 }
 844
 845 static void smb2_ioctl_filesys_dup_extents_done(struct tevent_req *subreq)
 846 {
 847         struct tevent_req *req = tevent_req_callback_data(subreq,
 848                                                           struct tevent_req);
 849         NTSTATUS status;
 850
 851         status = fsctl_dup_extents_recv(subreq);
 852         TALLOC_FREE(subreq);
 853         if (!tevent_req_nterror(req, status)) {
 854                 tevent_req_done(req);
 855         }
 856 }