source3/smbd/vfs.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    VFS initialisation and support functions
   5    Copyright (C) Tim Potter 1999
   6    Copyright (C) Alexander Bokovoy 2002
   7    Copyright (C) James Peach 2006
   8    Copyright (C) Volker Lendecke 2009
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22
  23    This work was sponsored by Optifacio Software Services, Inc.
  24 */
  25
  26 #include "includes.h"
  27 #include "system/filesys.h"
  28 #include "smbd/smbd.h"
  29 #include "smbd/globals.h"
  30 #include "../lib/util/memcache.h"
  31 #include "transfer_file.h"
  32 #include "ntioctl.h"
  33 #include "lib/util/tevent_unix.h"
  34
  35 #undef DBGC_CLASS
  36 #define DBGC_CLASS DBGC_VFS
  37
  38 static_decl_vfs;
  39
  40 struct vfs_fsp_data {
  41     struct vfs_fsp_data *next;
  42     struct vfs_handle_struct *owner;
  43     void (*destroy)(void *p_data);
  44     void *_dummy_;
  45     /* NOTE: This structure contains four pointers so that we can guarantee
  46      * that the end of the structure is always both 4-byte and 8-byte aligned.
  47      */
  48 };
  49
  50 struct vfs_init_function_entry {
  51         char *name;
  52         struct vfs_init_function_entry *prev, *next;
  53         const struct vfs_fn_pointers *fns;
  54 };
  55
  56 /****************************************************************************
  57     maintain the list of available backends
  58 ****************************************************************************/
  59
  60 static struct vfs_init_function_entry *vfs_find_backend_entry(const char *name)
  61 {
  62         struct vfs_init_function_entry *entry = backends;
  63
  64         DEBUG(10, ("vfs_find_backend_entry called for %s\n", name));
  65
  66         while(entry) {
  67                 if (strcmp(entry->name, name)==0) return entry;
  68                 entry = entry->next;
  69         }
  70
  71         return NULL;
  72 }
  73
  74 NTSTATUS smb_register_vfs(int version, const char *name,
  75                           const struct vfs_fn_pointers *fns)
  76 {
  77         struct vfs_init_function_entry *entry = backends;
  78
  79         if ((version != SMB_VFS_INTERFACE_VERSION)) {
  80                 DEBUG(0, ("Failed to register vfs module.\n"
  81                           "The module was compiled against SMB_VFS_INTERFACE_VERSION %d,\n"
  82                           "current SMB_VFS_INTERFACE_VERSION is %d.\n"
  83                           "Please recompile against the current Samba Version!\n",
  84                           version, SMB_VFS_INTERFACE_VERSION));
  85                 return NT_STATUS_OBJECT_TYPE_MISMATCH;
  86         }
  87
  88         if (!name || !name[0]) {
  89                 DEBUG(0,("smb_register_vfs() called with NULL pointer or empty name!\n"));
  90                 return NT_STATUS_INVALID_PARAMETER;
  91         }
  92
  93         if (vfs_find_backend_entry(name)) {
  94                 DEBUG(0,("VFS module %s already loaded!\n", name));
  95                 return NT_STATUS_OBJECT_NAME_COLLISION;
  96         }
  97
  98         entry = SMB_XMALLOC_P(struct vfs_init_function_entry);
  99         entry->name = smb_xstrdup(name);
 100         entry->fns = fns;
 101
 102         DLIST_ADD(backends, entry);
 103         DEBUG(5, ("Successfully added vfs backend '%s'\n", name));
 104         return NT_STATUS_OK;
 105 }
 106
 107 /****************************************************************************
 108   initialise default vfs hooks
 109 ****************************************************************************/
 110
 111 static void vfs_init_default(connection_struct *conn)
 112 {
 113         DEBUG(3, ("Initialising default vfs hooks\n"));
 114         vfs_init_custom(conn, DEFAULT_VFS_MODULE_NAME);
 115 }
 116
 117 /****************************************************************************
 118   initialise custom vfs hooks
 119  ****************************************************************************/
 120
 121 bool vfs_init_custom(connection_struct *conn, const char *vfs_object)
 122 {
 123         char *module_path = NULL;
 124         char *module_name = NULL;
 125         char *module_param = NULL, *p;
 126         vfs_handle_struct *handle;
 127         const struct vfs_init_function_entry *entry;
 128
 129         if (!conn||!vfs_object||!vfs_object[0]) {
 130                 DEBUG(0, ("vfs_init_custom() called with NULL pointer or "
 131                           "empty vfs_object!\n"));
 132                 return False;
 133         }
 134
 135         if(!backends) {
 136                 static_init_vfs;
 137         }
 138
 139         DEBUG(3, ("Initialising custom vfs hooks from [%s]\n", vfs_object));
 140
 141         module_path = smb_xstrdup(vfs_object);
 142
 143         p = strchr_m(module_path, ':');
 144
 145         if (p) {
 146                 *p = 0;
 147                 module_param = p+1;
 148                 trim_char(module_param, ' ', ' ');
 149         }
 150
 151         trim_char(module_path, ' ', ' ');
 152
 153         module_name = smb_xstrdup(module_path);
 154
 155         if ((module_name[0] == '/') &&
 156             (strcmp(module_path, DEFAULT_VFS_MODULE_NAME) != 0)) {
 157
 158                 /*
 159                  * Extract the module name from the path. Just use the base
 160                  * name of the last path component.
 161                  */
 162
 163                 SAFE_FREE(module_name);
 164                 module_name = smb_xstrdup(strrchr_m(module_path, '/')+1);
 165
 166                 p = strchr_m(module_name, '.');
 167
 168                 if (p != NULL) {
 169                         *p = '\0';
 170                 }
 171         }
 172
 173         /* First, try to load the module with the new module system */
 174         entry = vfs_find_backend_entry(module_name);
 175         if (!entry) {
 176                 NTSTATUS status;
 177
 178                 DEBUG(5, ("vfs module [%s] not loaded - trying to load...\n",
 179                           vfs_object));
 180
 181                 status = smb_load_module("vfs", module_path);
 182                 if (!NT_STATUS_IS_OK(status)) {
 183                         DEBUG(0, ("error probing vfs module '%s': %s\n",
 184                                   module_path, nt_errstr(status)));
 185                         goto fail;
 186                 }
 187
 188                 entry = vfs_find_backend_entry(module_name);
 189                 if (!entry) {
 190                         DEBUG(0,("Can't find a vfs module [%s]\n",vfs_object));
 191                         goto fail;
 192                 }
 193         }
 194
 195         DEBUGADD(5,("Successfully loaded vfs module [%s] with the new modules system\n", vfs_object));
 196
 197         handle = talloc_zero(conn, vfs_handle_struct);
 198         if (!handle) {
 199                 DEBUG(0,("TALLOC_ZERO() failed!\n"));
 200                 goto fail;
 201         }
 202         handle->conn = conn;
 203         handle->fns = entry->fns;
 204         if (module_param) {
 205                 handle->param = talloc_strdup(conn, module_param);
 206         }
 207         DLIST_ADD(conn->vfs_handles, handle);
 208
 209         SAFE_FREE(module_path);
 210         SAFE_FREE(module_name);
 211         return True;
 212
 213  fail:
 214         SAFE_FREE(module_path);
 215         SAFE_FREE(module_name);
 216         return False;
 217 }
 218
 219 /*****************************************************************
 220  Allow VFS modules to extend files_struct with VFS-specific state.
 221  This will be ok for small numbers of extensions, but might need to
 222  be refactored if it becomes more widely used.
 223 ******************************************************************/
 224
 225 #define EXT_DATA_AREA(e) ((uint8_t *)(e) + sizeof(struct vfs_fsp_data))
 226
 227 void *vfs_add_fsp_extension_notype(vfs_handle_struct *handle,
 228                                    files_struct *fsp, size_t ext_size,
 229                                    void (*destroy_fn)(void *p_data))
 230 {
 231         struct vfs_fsp_data *ext;
 232         void * ext_data;
 233
 234         /* Prevent VFS modules adding multiple extensions. */
 235         if ((ext_data = vfs_fetch_fsp_extension(handle, fsp))) {
 236                 return ext_data;
 237         }
 238
 239         ext = (struct vfs_fsp_data *)TALLOC_ZERO(
 240                 handle->conn, sizeof(struct vfs_fsp_data) + ext_size);
 241         if (ext == NULL) {
 242                 return NULL;
 243         }
 244
 245         ext->owner = handle;
 246         ext->next = fsp->vfs_extension;
 247         ext->destroy = destroy_fn;
 248         fsp->vfs_extension = ext;
 249         return EXT_DATA_AREA(ext);
 250 }
 251
 252 void vfs_remove_fsp_extension(vfs_handle_struct *handle, files_struct *fsp)
 253 {
 254         struct vfs_fsp_data *curr;
 255         struct vfs_fsp_data *prev;
 256
 257         for (curr = fsp->vfs_extension, prev = NULL;
 258              curr;
 259              prev = curr, curr = curr->next) {
 260                 if (curr->owner == handle) {
 261                     if (prev) {
 262                             prev->next = curr->next;
 263                     } else {
 264                             fsp->vfs_extension = curr->next;
 265                     }
 266                     if (curr->destroy) {
 267                             curr->destroy(EXT_DATA_AREA(curr));
 268                     }
 269                     TALLOC_FREE(curr);
 270                     return;
 271                 }
 272         }
 273 }
 274
 275 void vfs_remove_all_fsp_extensions(files_struct *fsp)
 276 {
 277         struct vfs_fsp_data *curr;
 278         struct vfs_fsp_data *next;
 279
 280         for (curr = fsp->vfs_extension; curr; curr = next) {
 281
 282                 next = curr->next;
 283                 fsp->vfs_extension = next;
 284
 285                 if (curr->destroy) {
 286                         curr->destroy(EXT_DATA_AREA(curr));
 287                 }
 288                 TALLOC_FREE(curr);
 289         }
 290 }
 291
 292 void *vfs_memctx_fsp_extension(vfs_handle_struct *handle, files_struct *fsp)
 293 {
 294         struct vfs_fsp_data *head;
 295
 296         for (head = fsp->vfs_extension; head; head = head->next) {
 297                 if (head->owner == handle) {
 298                         return head;
 299                 }
 300         }
 301
 302         return NULL;
 303 }
 304
 305 void *vfs_fetch_fsp_extension(vfs_handle_struct *handle, files_struct *fsp)
 306 {
 307         struct vfs_fsp_data *head;
 308
 309         head = (struct vfs_fsp_data *)vfs_memctx_fsp_extension(handle, fsp);
 310         if (head != NULL) {
 311                 return EXT_DATA_AREA(head);
 312         }
 313
 314         return NULL;
 315 }
 316
 317 #undef EXT_DATA_AREA
 318
 319 /*****************************************************************
 320  Generic VFS init.
 321 ******************************************************************/
 322
 323 bool smbd_vfs_init(connection_struct *conn)
 324 {
 325         const char **vfs_objects;
 326         unsigned int i = 0;
 327         int j = 0;
 328
 329         /* Normal share - initialise with disk access functions */
 330         vfs_init_default(conn);
 331
 332         /* No need to load vfs modules for printer connections */
 333         if (conn->printer) {
 334                 return True;
 335         }
 336
 337         vfs_objects = lp_vfs_objects(SNUM(conn));
 338
 339         /* Override VFS functions if 'vfs object' was not specified*/
 340         if (!vfs_objects || !vfs_objects[0])
 341                 return True;
 342
 343         for (i=0; vfs_objects[i] ;) {
 344                 i++;
 345         }
 346
 347         for (j=i-1; j >= 0; j--) {
 348                 if (!vfs_init_custom(conn, vfs_objects[j])) {
 349                         DEBUG(0, ("smbd_vfs_init: vfs_init_custom failed for %s\n", vfs_objects[j]));
 350                         return False;
 351                 }
 352         }
 353         return True;
 354 }
 355
 356 /*******************************************************************
 357  Check if a file exists in the vfs.
 358 ********************************************************************/
 359
 360 NTSTATUS vfs_file_exist(connection_struct *conn, struct smb_filename *smb_fname)
 361 {
 362         /* Only return OK if stat was successful and S_ISREG */
 363         if ((SMB_VFS_STAT(conn, smb_fname) != -1) &&
 364             S_ISREG(smb_fname->st.st_ex_mode)) {
 365                 return NT_STATUS_OK;
 366         }
 367
 368         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 369 }
 370
 371 /****************************************************************************
 372  Read data from fsp on the vfs. (note: EINTR re-read differs from vfs_write_data)
 373 ****************************************************************************/
 374
 375 ssize_t vfs_read_data(files_struct *fsp, char *buf, size_t byte_count)
 376 {
 377         size_t total=0;
 378
 379         while (total < byte_count)
 380         {
 381                 ssize_t ret = SMB_VFS_READ(fsp, buf + total,
 382                                            byte_count - total);
 383
 384                 if (ret == 0) return total;
 385                 if (ret == -1) {
 386                         if (errno == EINTR)
 387                                 continue;
 388                         else
 389                                 return -1;
 390                 }
 391                 total += ret;
 392         }
 393         return (ssize_t)total;
 394 }
 395
 396 /****************************************************************************
 397  Write data to a fd on the vfs.
 398 ****************************************************************************/
 399
 400 ssize_t vfs_write_data(struct smb_request *req,
 401                         files_struct *fsp,
 402                         const char *buffer,
 403                         size_t N)
 404 {
 405         size_t total=0;
 406         ssize_t ret;
 407
 408         if (req && req->unread_bytes) {
 409                 int sockfd = req->xconn->transport.sock;
 410                 int old_flags;
 411                 SMB_ASSERT(req->unread_bytes == N);
 412                 /* VFS_RECVFILE must drain the socket
 413                  * before returning. */
 414                 req->unread_bytes = 0;
 415                 /* Ensure the socket is blocking. */
 416                 old_flags = fcntl(sockfd, F_GETFL, 0);
 417                 if (set_blocking(sockfd, true) == -1) {
 418                         return (ssize_t)-1;
 419                 }
 420                 ret = SMB_VFS_RECVFILE(sockfd,
 421                                         fsp,
 422                                         (off_t)-1,
 423                                         N);
 424                 if (fcntl(sockfd, F_SETFL, old_flags) == -1) {
 425                         return (ssize_t)-1;
 426                 }
 427                 return ret;
 428         }
 429
 430         while (total < N) {
 431                 ret = SMB_VFS_WRITE(fsp, buffer + total, N - total);
 432
 433                 if (ret == -1)
 434                         return -1;
 435                 if (ret == 0)
 436                         return total;
 437
 438                 total += ret;
 439         }
 440         return (ssize_t)total;
 441 }
 442
 443 ssize_t vfs_pwrite_data(struct smb_request *req,
 444                         files_struct *fsp,
 445                         const char *buffer,
 446                         size_t N,
 447                         off_t offset)
 448 {
 449         size_t total=0;
 450         ssize_t ret;
 451
 452         if (req && req->unread_bytes) {
 453                 int sockfd = req->xconn->transport.sock;
 454                 SMB_ASSERT(req->unread_bytes == N);
 455                 /* VFS_RECVFILE must drain the socket
 456                  * before returning. */
 457                 req->unread_bytes = 0;
 458                 /*
 459                  * Leave the socket non-blocking and
 460                  * use SMB_VFS_RECVFILE. If it returns
 461                  * EAGAIN || EWOULDBLOCK temporarily set
 462                  * the socket blocking and retry
 463                  * the RECVFILE.
 464                  */
 465                 while (total < N) {
 466                         ret = SMB_VFS_RECVFILE(sockfd,
 467                                                 fsp,
 468                                                 offset + total,
 469                                                 N - total);
 470                         if (ret == 0 || (ret == -1 &&
 471                                          (errno == EAGAIN ||
 472                                           errno == EWOULDBLOCK))) {
 473                                 int old_flags;
 474                                 /* Ensure the socket is blocking. */
 475                                 old_flags = fcntl(sockfd, F_GETFL, 0);
 476                                 if (set_blocking(sockfd, true) == -1) {
 477                                         return (ssize_t)-1;
 478                                 }
 479                                 ret = SMB_VFS_RECVFILE(sockfd,
 480                                                         fsp,
 481                                                         offset + total,
 482                                                         N - total);
 483                                 if (fcntl(sockfd, F_SETFL, old_flags) == -1) {
 484                                         return (ssize_t)-1;
 485                                 }
 486                                 if (ret == -1) {
 487                                         return (ssize_t)-1;
 488                                 }
 489                                 total += ret;
 490                                 return (ssize_t)total;
 491                         }
 492                         /* Any other error case. */
 493                         if (ret == -1) {
 494                                 return ret;
 495                         }
 496                         total += ret;
 497                 }
 498                 return (ssize_t)total;
 499         }
 500
 501         while (total < N) {
 502                 ret = SMB_VFS_PWRITE(fsp, buffer + total, N - total,
 503                                      offset + total);
 504
 505                 if (ret == -1)
 506                         return -1;
 507                 if (ret == 0)
 508                         return total;
 509
 510                 total += ret;
 511         }
 512         return (ssize_t)total;
 513 }
 514 /****************************************************************************
 515  An allocate file space call using the vfs interface.
 516  Allocates space for a file from a filedescriptor.
 517  Returns 0 on success, -1 on failure.
 518 ****************************************************************************/
 519
 520 int vfs_allocate_file_space(files_struct *fsp, uint64_t len)
 521 {
 522         int ret;
 523         connection_struct *conn = fsp->conn;
 524         uint64_t space_avail;
 525         uint64_t bsize,dfree,dsize;
 526         NTSTATUS status;
 527
 528         /*
 529          * Actually try and commit the space on disk....
 530          */
 531
 532         DEBUG(10,("vfs_allocate_file_space: file %s, len %.0f\n",
 533                   fsp_str_dbg(fsp), (double)len));
 534
 535         if (((off_t)len) < 0) {
 536                 DEBUG(0,("vfs_allocate_file_space: %s negative len "
 537                          "requested.\n", fsp_str_dbg(fsp)));
 538                 errno = EINVAL;
 539                 return -1;
 540         }
 541
 542         status = vfs_stat_fsp(fsp);
 543         if (!NT_STATUS_IS_OK(status)) {
 544                 return -1;
 545         }
 546
 547         if (len == (uint64_t)fsp->fsp_name->st.st_ex_size)
 548                 return 0;
 549
 550         if (len < (uint64_t)fsp->fsp_name->st.st_ex_size) {
 551                 /* Shrink - use ftruncate. */
 552
 553                 DEBUG(10,("vfs_allocate_file_space: file %s, shrink. Current "
 554                           "size %.0f\n", fsp_str_dbg(fsp),
 555                           (double)fsp->fsp_name->st.st_ex_size));
 556
 557                 contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_ALLOC_SHRINK);
 558
 559                 flush_write_cache(fsp, SAMBA_SIZECHANGE_FLUSH);
 560                 if ((ret = SMB_VFS_FTRUNCATE(fsp, (off_t)len)) != -1) {
 561                         set_filelen_write_cache(fsp, len);
 562                 }
 563
 564                 contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_ALLOC_SHRINK);
 565
 566                 return ret;
 567         }
 568
 569         /* Grow - we need to test if we have enough space. */
 570
 571         contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_ALLOC_GROW);
 572
 573         if (lp_strict_allocate(SNUM(fsp->conn))) {
 574                 /* See if we have a syscall that will allocate beyond
 575                    end-of-file without changing EOF. */
 576                 ret = SMB_VFS_FALLOCATE(fsp, VFS_FALLOCATE_FL_KEEP_SIZE,
 577                                         0, len);
 578         } else {
 579                 ret = 0;
 580         }
 581
 582         contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_ALLOC_GROW);
 583
 584         if (ret == 0) {
 585                 /* We changed the allocation size on disk, but not
 586                    EOF - exactly as required. We're done ! */
 587                 return 0;
 588         }
 589
 590         if (ret == -1 && errno == ENOSPC) {
 591                 return -1;
 592         }
 593
 594         len -= fsp->fsp_name->st.st_ex_size;
 595         len /= 1024; /* Len is now number of 1k blocks needed. */
 596         space_avail = get_dfree_info(conn, fsp->fsp_name->base_name,
 597                                      &bsize, &dfree, &dsize);
 598         if (space_avail == (uint64_t)-1) {
 599                 return -1;
 600         }
 601
 602         DEBUG(10,("vfs_allocate_file_space: file %s, grow. Current size %.0f, "
 603                   "needed blocks = %.0f, space avail = %.0f\n",
 604                   fsp_str_dbg(fsp), (double)fsp->fsp_name->st.st_ex_size, (double)len,
 605                   (double)space_avail));
 606
 607         if (len > space_avail) {
 608                 errno = ENOSPC;
 609                 return -1;
 610         }
 611
 612         return 0;
 613 }
 614
 615 /****************************************************************************
 616  A vfs set_filelen call.
 617  set the length of a file from a filedescriptor.
 618  Returns 0 on success, -1 on failure.
 619 ****************************************************************************/
 620
 621 int vfs_set_filelen(files_struct *fsp, off_t len)
 622 {
 623         int ret;
 624
 625         contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_SET_FILE_LEN);
 626
 627         DEBUG(10,("vfs_set_filelen: ftruncate %s to len %.0f\n",
 628                   fsp_str_dbg(fsp), (double)len));
 629         flush_write_cache(fsp, SAMBA_SIZECHANGE_FLUSH);
 630         if ((ret = SMB_VFS_FTRUNCATE(fsp, len)) != -1) {
 631                 set_filelen_write_cache(fsp, len);
 632                 notify_fname(fsp->conn, NOTIFY_ACTION_MODIFIED,
 633                              FILE_NOTIFY_CHANGE_SIZE
 634                              | FILE_NOTIFY_CHANGE_ATTRIBUTES,
 635                              fsp->fsp_name->base_name);
 636         }
 637
 638         contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_SET_FILE_LEN);
 639
 640         return ret;
 641 }
 642
 643 /****************************************************************************
 644  A slow version of fallocate. Fallback code if SMB_VFS_FALLOCATE
 645  fails. Needs to be outside of the default version of SMB_VFS_FALLOCATE
 646  as this is also called from the default SMB_VFS_FTRUNCATE code.
 647  Always extends the file size.
 648  Returns 0 on success, -1 on failure.
 649 ****************************************************************************/
 650
 651 #define SPARSE_BUF_WRITE_SIZE (32*1024)
 652
 653 int vfs_slow_fallocate(files_struct *fsp, off_t offset, off_t len)
 654 {
 655         ssize_t pwrite_ret;
 656         size_t total = 0;
 657
 658         if (!sparse_buf) {
 659                 sparse_buf = SMB_CALLOC_ARRAY(char, SPARSE_BUF_WRITE_SIZE);
 660                 if (!sparse_buf) {
 661                         errno = ENOMEM;
 662                         return -1;
 663                 }
 664         }
 665
 666         while (total < len) {
 667                 size_t curr_write_size = MIN(SPARSE_BUF_WRITE_SIZE, (len - total));
 668
 669                 pwrite_ret = SMB_VFS_PWRITE(fsp, sparse_buf, curr_write_size, offset + total);
 670                 if (pwrite_ret == -1) {
 671                         int saved_errno = errno;
 672                         DEBUG(10,("vfs_slow_fallocate: SMB_VFS_PWRITE for file "
 673                                   "%s failed with error %s\n",
 674                                   fsp_str_dbg(fsp), strerror(saved_errno)));
 675                         errno = saved_errno;
 676                         return -1;
 677                 }
 678                 total += pwrite_ret;
 679         }
 680
 681         return 0;
 682 }
 683
 684 /****************************************************************************
 685  A vfs fill sparse call.
 686  Writes zeros from the end of file to len, if len is greater than EOF.
 687  Used only by strict_sync.
 688  Returns 0 on success, -1 on failure.
 689 ****************************************************************************/
 690
 691 int vfs_fill_sparse(files_struct *fsp, off_t len)
 692 {
 693         int ret;
 694         NTSTATUS status;
 695         off_t offset;
 696         size_t num_to_write;
 697
 698         status = vfs_stat_fsp(fsp);
 699         if (!NT_STATUS_IS_OK(status)) {
 700                 return -1;
 701         }
 702
 703         if (len <= fsp->fsp_name->st.st_ex_size) {
 704                 return 0;
 705         }
 706
 707 #ifdef S_ISFIFO
 708         if (S_ISFIFO(fsp->fsp_name->st.st_ex_mode)) {
 709                 return 0;
 710         }
 711 #endif
 712
 713         DEBUG(10,("vfs_fill_sparse: write zeros in file %s from len %.0f to "
 714                   "len %.0f (%.0f bytes)\n", fsp_str_dbg(fsp),
 715                   (double)fsp->fsp_name->st.st_ex_size, (double)len,
 716                   (double)(len - fsp->fsp_name->st.st_ex_size)));
 717
 718         contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_FILL_SPARSE);
 719
 720         flush_write_cache(fsp, SAMBA_SIZECHANGE_FLUSH);
 721
 722         offset = fsp->fsp_name->st.st_ex_size;
 723         num_to_write = len - fsp->fsp_name->st.st_ex_size;
 724
 725         /* Only do this on non-stream file handles. */
 726         if (fsp->base_fsp == NULL) {
 727                 /* for allocation try fallocate first. This can fail on some
 728                  * platforms e.g. when the filesystem doesn't support it and no
 729                  * emulation is being done by the libc (like on AIX with JFS1). In that
 730                  * case we do our own emulation. fallocate implementations can
 731                  * return ENOTSUP or EINVAL in cases like that. */
 732                 ret = SMB_VFS_FALLOCATE(fsp, 0, offset, num_to_write);
 733                 if (ret == -1 && errno == ENOSPC) {
 734                         goto out;
 735                 }
 736                 if (ret == 0) {
 737                         goto out;
 738                 }
 739                 DEBUG(10,("vfs_fill_sparse: SMB_VFS_FALLOCATE failed with "
 740                         "error %d. Falling back to slow manual allocation\n", ret));
 741         }
 742
 743         ret = vfs_slow_fallocate(fsp, offset, num_to_write);
 744
 745  out:
 746
 747         if (ret == 0) {
 748                 set_filelen_write_cache(fsp, len);
 749         }
 750
 751         contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_FILL_SPARSE);
 752         return ret;
 753 }
 754
 755 /****************************************************************************
 756  Transfer some data (n bytes) between two file_struct's.
 757 ****************************************************************************/
 758
 759 static ssize_t vfs_pread_fn(void *file, void *buf, size_t len, off_t offset)
 760 {
 761         struct files_struct *fsp = (struct files_struct *)file;
 762
 763         return SMB_VFS_PREAD(fsp, buf, len, offset);
 764 }
 765
 766 static ssize_t vfs_pwrite_fn(void *file, const void *buf, size_t len, off_t offset)
 767 {
 768         struct files_struct *fsp = (struct files_struct *)file;
 769
 770         return SMB_VFS_PWRITE(fsp, buf, len, offset);
 771 }
 772
 773 off_t vfs_transfer_file(files_struct *in, files_struct *out, off_t n)
 774 {
 775         return transfer_file_internal((void *)in, (void *)out, n,
 776                                       vfs_pread_fn, vfs_pwrite_fn);
 777 }
 778
 779 /*******************************************************************
 780  A vfs_readdir wrapper which just returns the file name.
 781 ********************************************************************/
 782
 783 const char *vfs_readdirname(connection_struct *conn, void *p,
 784                             SMB_STRUCT_STAT *sbuf, char **talloced)
 785 {
 786         struct dirent *ptr= NULL;
 787         const char *dname;
 788         char *translated;
 789         NTSTATUS status;
 790
 791         if (!p)
 792                 return(NULL);
 793
 794         ptr = SMB_VFS_READDIR(conn, (DIR *)p, sbuf);
 795         if (!ptr)
 796                 return(NULL);
 797
 798         dname = ptr->d_name;
 799
 800
 801 #ifdef NEXT2
 802         if (telldir(p) < 0)
 803                 return(NULL);
 804 #endif
 805
 806 #ifdef HAVE_BROKEN_READDIR_NAME
 807         /* using /usr/ucb/cc is BAD */
 808         dname = dname - 2;
 809 #endif
 810
 811         status = SMB_VFS_TRANSLATE_NAME(conn, dname, vfs_translate_to_windows,
 812                                         talloc_tos(), &translated);
 813         if (NT_STATUS_EQUAL(status, NT_STATUS_NONE_MAPPED)) {
 814                 *talloced = NULL;
 815                 return dname;
 816         }
 817         *talloced = translated;
 818         if (!NT_STATUS_IS_OK(status)) {
 819                 return NULL;
 820         }
 821         return translated;
 822 }
 823
 824 /*******************************************************************
 825  A wrapper for vfs_chdir().
 826 ********************************************************************/
 827
 828 int vfs_ChDir(connection_struct *conn, const char *path)
 829 {
 830         int ret;
 831
 832         if (!LastDir) {
 833                 LastDir = SMB_STRDUP("");
 834         }
 835
 836         if (ISDOT(path)) {
 837                 return 0;
 838         }
 839
 840         if (*path == '/' && strcsequal(LastDir,path)) {
 841                 return 0;
 842         }
 843
 844         DEBUG(4,("vfs_ChDir to %s\n",path));
 845
 846         ret = SMB_VFS_CHDIR(conn,path);
 847         if (ret == 0) {
 848                 /* Global cache. */
 849                 SAFE_FREE(LastDir);
 850                 LastDir = SMB_STRDUP(path);
 851
 852                 /* conn cache. */
 853                 TALLOC_FREE(conn->cwd);
 854                 conn->cwd = vfs_GetWd(conn, conn);
 855                 DEBUG(4,("vfs_ChDir got %s\n",conn->cwd));
 856         }
 857         return ret;
 858 }
 859
 860 /*******************************************************************
 861  Return the absolute current directory path - given a UNIX pathname.
 862  Note that this path is returned in DOS format, not UNIX
 863  format. Note this can be called with conn == NULL.
 864 ********************************************************************/
 865
 866 char *vfs_GetWd(TALLOC_CTX *ctx, connection_struct *conn)
 867 {
 868         char *current_dir = NULL;
 869         char *result = NULL;
 870         DATA_BLOB cache_value;
 871         struct file_id key;
 872         struct smb_filename *smb_fname_dot = NULL;
 873         struct smb_filename *smb_fname_full = NULL;
 874
 875         if (!lp_getwd_cache()) {
 876                 goto nocache;
 877         }
 878
 879         smb_fname_dot = synthetic_smb_fname(ctx, ".", NULL, NULL);
 880         if (smb_fname_dot == NULL) {
 881                 errno = ENOMEM;
 882                 goto out;
 883         }
 884
 885         if (SMB_VFS_STAT(conn, smb_fname_dot) == -1) {
 886                 /*
 887                  * Known to fail for root: the directory may be NFS-mounted
 888                  * and exported with root_squash (so has no root access).
 889                  */
 890                 DEBUG(1,("vfs_GetWd: couldn't stat \".\" error %s "
 891                          "(NFS problem ?)\n", strerror(errno) ));
 892                 goto nocache;
 893         }
 894
 895         key = vfs_file_id_from_sbuf(conn, &smb_fname_dot->st);
 896
 897         if (!memcache_lookup(smbd_memcache(), GETWD_CACHE,
 898                              data_blob_const(&key, sizeof(key)),
 899                              &cache_value)) {
 900                 goto nocache;
 901         }
 902
 903         SMB_ASSERT((cache_value.length > 0)
 904                    && (cache_value.data[cache_value.length-1] == '\0'));
 905
 906         smb_fname_full = synthetic_smb_fname(ctx, (char *)cache_value.data,
 907                                              NULL, NULL);
 908         if (smb_fname_full == NULL) {
 909                 errno = ENOMEM;
 910                 goto out;
 911         }
 912
 913         if ((SMB_VFS_STAT(conn, smb_fname_full) == 0) &&
 914             (smb_fname_dot->st.st_ex_dev == smb_fname_full->st.st_ex_dev) &&
 915             (smb_fname_dot->st.st_ex_ino == smb_fname_full->st.st_ex_ino) &&
 916             (S_ISDIR(smb_fname_dot->st.st_ex_mode))) {
 917                 /*
 918                  * Ok, we're done
 919                  */
 920                 result = talloc_strdup(ctx, smb_fname_full->base_name);
 921                 if (result == NULL) {
 922                         errno = ENOMEM;
 923                 }
 924                 goto out;
 925         }
 926
 927  nocache:
 928
 929         /*
 930          * We don't have the information to hand so rely on traditional
 931          * methods. The very slow getcwd, which spawns a process on some
 932          * systems, or the not quite so bad getwd.
 933          */
 934
 935         current_dir = SMB_VFS_GETWD(conn);
 936         if (current_dir == NULL) {
 937                 DEBUG(0, ("vfs_GetWd: SMB_VFS_GETWD call failed: %s\n",
 938                           strerror(errno)));
 939                 goto out;
 940         }
 941
 942         if (lp_getwd_cache() && VALID_STAT(smb_fname_dot->st)) {
 943                 key = vfs_file_id_from_sbuf(conn, &smb_fname_dot->st);
 944
 945                 memcache_add(smbd_memcache(), GETWD_CACHE,
 946                              data_blob_const(&key, sizeof(key)),
 947                              data_blob_const(current_dir,
 948                                                 strlen(current_dir)+1));
 949         }
 950
 951         result = talloc_strdup(ctx, current_dir);
 952         if (result == NULL) {
 953                 errno = ENOMEM;
 954         }
 955
 956  out:
 957         TALLOC_FREE(smb_fname_dot);
 958         TALLOC_FREE(smb_fname_full);
 959         SAFE_FREE(current_dir);
 960         return result;
 961 }
 962
 963 /*******************************************************************
 964  Reduce a file name, removing .. elements and checking that
 965  it is below dir in the heirachy. This uses realpath.
 966  This function must run as root, and will return names
 967  and valid stat structs that can be checked on open.
 968 ********************************************************************/
 969
 970 NTSTATUS check_reduced_name_with_privilege(connection_struct *conn,
 971                         const char *fname,
 972                         struct smb_request *smbreq)
 973 {
 974         NTSTATUS status;
 975         TALLOC_CTX *ctx = talloc_tos();
 976         const char *conn_rootdir;
 977         size_t rootdir_len;
 978         char *dir_name = NULL;
 979         const char *last_component = NULL;
 980         char *resolved_name = NULL;
 981         char *saved_dir = NULL;
 982         struct smb_filename *smb_fname_cwd = NULL;
 983         struct privilege_paths *priv_paths = NULL;
 984         int ret;
 985
 986         DEBUG(3,("check_reduced_name_with_privilege [%s] [%s]\n",
 987                         fname,
 988                         conn->connectpath));
 989
 990
 991         priv_paths = talloc_zero(smbreq, struct privilege_paths);
 992         if (!priv_paths) {
 993                 status = NT_STATUS_NO_MEMORY;
 994                 goto err;
 995         }
 996
 997         if (!parent_dirname(ctx, fname, &dir_name, &last_component)) {
 998                 status = NT_STATUS_NO_MEMORY;
 999                 goto err;
1000         }
1001
1002         priv_paths->parent_name.base_name = talloc_strdup(priv_paths, dir_name);
1003         priv_paths->file_name.base_name = talloc_strdup(priv_paths, last_component);
1004
1005         if (priv_paths->parent_name.base_name == NULL ||
1006                         priv_paths->file_name.base_name == NULL) {
1007                 status = NT_STATUS_NO_MEMORY;
1008                 goto err;
1009         }
1010
1011         if (SMB_VFS_STAT(conn, &priv_paths->parent_name) != 0) {
1012                 status = map_nt_error_from_unix(errno);
1013                 goto err;
1014         }
1015         /* Remember where we were. */
1016         saved_dir = vfs_GetWd(ctx, conn);
1017         if (!saved_dir) {
1018                 status = map_nt_error_from_unix(errno);
1019                 goto err;
1020         }
1021
1022         /* Go to the parent directory to lock in memory. */
1023         if (vfs_ChDir(conn, priv_paths->parent_name.base_name) == -1) {
1024                 status = map_nt_error_from_unix(errno);
1025                 goto err;
1026         }
1027
1028         /* Get the absolute path of the parent directory. */
1029         resolved_name = SMB_VFS_REALPATH(conn,".");
1030         if (!resolved_name) {
1031                 status = map_nt_error_from_unix(errno);
1032                 goto err;
1033         }
1034
1035         if (*resolved_name != '/') {
1036                 DEBUG(0,("check_reduced_name_with_privilege: realpath "
1037                         "doesn't return absolute paths !\n"));
1038                 status = NT_STATUS_OBJECT_NAME_INVALID;
1039                 goto err;
1040         }
1041
1042         DEBUG(10,("check_reduced_name_with_privilege: realpath [%s] -> [%s]\n",
1043                 priv_paths->parent_name.base_name,
1044                 resolved_name));
1045
1046         /* Now check the stat value is the same. */
1047         smb_fname_cwd = synthetic_smb_fname(talloc_tos(), ".", NULL, NULL);
1048         if (smb_fname_cwd == NULL) {
1049                 status = NT_STATUS_NO_MEMORY;
1050                 goto err;
1051         }
1052
1053         if (SMB_VFS_LSTAT(conn, smb_fname_cwd) != 0) {
1054                 status = map_nt_error_from_unix(errno);
1055                 goto err;
1056         }
1057
1058         /* Ensure we're pointing at the same place. */
1059         if (!check_same_stat(&smb_fname_cwd->st, &priv_paths->parent_name.st)) {
1060                 DEBUG(0,("check_reduced_name_with_privilege: "
1061                         "device/inode/uid/gid on directory %s changed. "
1062                         "Denying access !\n",
1063                         priv_paths->parent_name.base_name));
1064                 status = NT_STATUS_ACCESS_DENIED;
1065                 goto err;
1066         }
1067
1068         /* Ensure we're below the connect path. */
1069
1070         conn_rootdir = SMB_VFS_CONNECTPATH(conn, fname);
1071         if (conn_rootdir == NULL) {
1072                 DEBUG(2, ("check_reduced_name_with_privilege: Could not get "
1073                         "conn_rootdir\n"));
1074                 status = NT_STATUS_ACCESS_DENIED;
1075                 goto err;
1076         }
1077
1078         rootdir_len = strlen(conn_rootdir);
1079
1080         /*
1081          * In the case of rootdir_len == 1, we know that conn_rootdir is
1082          * "/", and we also know that resolved_name starts with a slash.
1083          * So, in this corner case, resolved_name is automatically a
1084          * sub-directory of the conn_rootdir. Thus we can skip the string
1085          * comparison and the next character checks (which are even
1086          * wrong in this case).
1087          */
1088         if (rootdir_len != 1) {
1089                 bool matched;
1090
1091                 matched = (strncmp(conn_rootdir, resolved_name,
1092                                 rootdir_len) == 0);
1093
1094                 if (!matched || (resolved_name[rootdir_len] != '/' &&
1095                                  resolved_name[rootdir_len] != '\0')) {
1096                         DEBUG(2, ("check_reduced_name_with_privilege: Bad "
1097                                 "access attempt: %s is a symlink outside the "
1098                                 "share path\n",
1099                                 dir_name));
1100                         DEBUGADD(2, ("conn_rootdir =%s\n", conn_rootdir));
1101                         DEBUGADD(2, ("resolved_name=%s\n", resolved_name));
1102                         status = NT_STATUS_ACCESS_DENIED;
1103                         goto err;
1104                 }
1105         }
1106
1107         /* Now ensure that the last component either doesn't
1108            exist, or is *NOT* a symlink. */
1109
1110         ret = SMB_VFS_LSTAT(conn, &priv_paths->file_name);
1111         if (ret == -1) {
1112                 /* Errno must be ENOENT for this be ok. */
1113                 if (errno != ENOENT) {
1114                         status = map_nt_error_from_unix(errno);
1115                         DEBUG(2, ("check_reduced_name_with_privilege: "
1116                                 "LSTAT on %s failed with %s\n",
1117                                 priv_paths->file_name.base_name,
1118                                 nt_errstr(status)));
1119                         goto err;
1120                 }
1121         }
1122
1123         if (VALID_STAT(priv_paths->file_name.st) &&
1124                         S_ISLNK(priv_paths->file_name.st.st_ex_mode)) {
1125                 DEBUG(2, ("check_reduced_name_with_privilege: "
1126                         "Last component %s is a symlink. Denying"
1127                         "access.\n",
1128                         priv_paths->file_name.base_name));
1129                 status = NT_STATUS_ACCESS_DENIED;
1130                 goto err;
1131         }
1132
1133         smbreq->priv_paths = priv_paths;
1134         status = NT_STATUS_OK;
1135
1136   err:
1137
1138         if (saved_dir) {
1139                 vfs_ChDir(conn, saved_dir);
1140         }
1141         SAFE_FREE(resolved_name);
1142         if (!NT_STATUS_IS_OK(status)) {
1143                 TALLOC_FREE(priv_paths);
1144         }
1145         TALLOC_FREE(dir_name);
1146         return status;
1147 }
1148
1149 /*******************************************************************
1150  Reduce a file name, removing .. elements and checking that
1151  it is below dir in the heirachy. This uses realpath.
1152 ********************************************************************/
1153
1154 NTSTATUS check_reduced_name(connection_struct *conn, const char *fname)
1155 {
1156         char *resolved_name = NULL;
1157         bool allow_symlinks = true;
1158         bool allow_widelinks = false;
1159
1160         DBG_DEBUG("check_reduced_name [%s] [%s]\n", fname, conn->connectpath);
1161
1162         resolved_name = SMB_VFS_REALPATH(conn,fname);
1163
1164         if (!resolved_name) {
1165                 switch (errno) {
1166                         case ENOTDIR:
1167                                 DEBUG(3,("check_reduced_name: Component not a "
1168                                          "directory in getting realpath for "
1169                                          "%s\n", fname));
1170                                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
1171                         case ENOENT:
1172                         {
1173                                 TALLOC_CTX *ctx = talloc_tos();
1174                                 char *dir_name = NULL;
1175                                 const char *last_component = NULL;
1176                                 char *new_name = NULL;
1177                                 int ret;
1178
1179                                 /* Last component didn't exist.
1180                                    Remove it and try and canonicalise
1181                                    the directory name. */
1182                                 if (!parent_dirname(ctx, fname,
1183                                                 &dir_name,
1184                                                 &last_component)) {
1185                                         return NT_STATUS_NO_MEMORY;
1186                                 }
1187
1188                                 resolved_name = SMB_VFS_REALPATH(conn,dir_name);
1189                                 if (!resolved_name) {
1190                                         NTSTATUS status = map_nt_error_from_unix(errno);
1191
1192                                         if (errno == ENOENT || errno == ENOTDIR) {
1193                                                 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
1194                                         }
1195
1196                                         DEBUG(3,("check_reduce_name: "
1197                                                  "couldn't get realpath for "
1198                                                  "%s (%s)\n",
1199                                                 fname,
1200                                                 nt_errstr(status)));
1201                                         return status;
1202                                 }
1203                                 ret = asprintf(&new_name, "%s/%s",
1204                                                resolved_name, last_component);
1205                                 SAFE_FREE(resolved_name);
1206                                 if (ret == -1) {
1207                                         return NT_STATUS_NO_MEMORY;
1208                                 }
1209                                 resolved_name = new_name;
1210                                 break;
1211                         }
1212                         default:
1213                                 DEBUG(3,("check_reduced_name: couldn't get "
1214                                          "realpath for %s\n", fname));
1215                                 return map_nt_error_from_unix(errno);
1216                 }
1217         }
1218
1219         DEBUG(10,("check_reduced_name realpath [%s] -> [%s]\n", fname,
1220                   resolved_name));
1221
1222         if (*resolved_name != '/') {
1223                 DEBUG(0,("check_reduced_name: realpath doesn't return "
1224                          "absolute paths !\n"));
1225                 SAFE_FREE(resolved_name);
1226                 return NT_STATUS_OBJECT_NAME_INVALID;
1227         }
1228
1229         allow_widelinks = lp_widelinks(SNUM(conn));
1230         allow_symlinks = lp_follow_symlinks(SNUM(conn));
1231
1232         /* Common widelinks and symlinks checks. */
1233         if (!allow_widelinks || !allow_symlinks) {
1234                 const char *conn_rootdir;
1235                 size_t rootdir_len;
1236
1237                 conn_rootdir = SMB_VFS_CONNECTPATH(conn, fname);
1238                 if (conn_rootdir == NULL) {
1239                         DEBUG(2, ("check_reduced_name: Could not get "
1240                                 "conn_rootdir\n"));
1241                         SAFE_FREE(resolved_name);
1242                         return NT_STATUS_ACCESS_DENIED;
1243                 }
1244
1245                 rootdir_len = strlen(conn_rootdir);
1246
1247                 /*
1248                  * In the case of rootdir_len == 1, we know that
1249                  * conn_rootdir is "/", and we also know that
1250                  * resolved_name starts with a slash.  So, in this
1251                  * corner case, resolved_name is automatically a
1252                  * sub-directory of the conn_rootdir. Thus we can skip
1253                  * the string comparison and the next character checks
1254                  * (which are even wrong in this case).
1255                  */
1256                 if (rootdir_len != 1) {
1257                         bool matched;
1258
1259                         matched = (strncmp(conn_rootdir, resolved_name,
1260                                         rootdir_len) == 0);
1261                         if (!matched || (resolved_name[rootdir_len] != '/' &&
1262                                          resolved_name[rootdir_len] != '\0')) {
1263                                 DEBUG(2, ("check_reduced_name: Bad access "
1264                                         "attempt: %s is a symlink outside the "
1265                                         "share path\n", fname));
1266                                 DEBUGADD(2, ("conn_rootdir =%s\n",
1267                                              conn_rootdir));
1268                                 DEBUGADD(2, ("resolved_name=%s\n",
1269                                              resolved_name));
1270                                 SAFE_FREE(resolved_name);
1271                                 return NT_STATUS_ACCESS_DENIED;
1272                         }
1273                 }
1274
1275                 /* Extra checks if all symlinks are disallowed. */
1276                 if (!allow_symlinks) {
1277                         /* fname can't have changed in resolved_path. */
1278                         const char *p = &resolved_name[rootdir_len];
1279
1280                         /* *p can be '\0' if fname was "." */
1281                         if (*p == '\0' && ISDOT(fname)) {
1282                                 goto out;
1283                         }
1284
1285                         if (*p != '/') {
1286                                 DEBUG(2, ("check_reduced_name: logic error (%c) "
1287                                         "in resolved_name: %s\n",
1288                                         *p,
1289                                         fname));
1290                                 SAFE_FREE(resolved_name);
1291                                 return NT_STATUS_ACCESS_DENIED;
1292                         }
1293
1294                         p++;
1295                         if (strcmp(fname, p)!=0) {
1296                                 DEBUG(2, ("check_reduced_name: Bad access "
1297                                         "attempt: %s is a symlink to %s\n",
1298                                           fname, p));
1299                                 SAFE_FREE(resolved_name);
1300                                 return NT_STATUS_ACCESS_DENIED;
1301                         }
1302                 }
1303         }
1304
1305   out:
1306
1307         DBG_INFO("%s reduced to %s\n", fname, resolved_name);
1308         SAFE_FREE(resolved_name);
1309         return NT_STATUS_OK;
1310 }
1311
1312 /**
1313  * XXX: This is temporary and there should be no callers of this once
1314  * smb_filename is plumbed through all path based operations.
1315  *
1316  * Called when we know stream name parsing has already been done.
1317  */
1318 int vfs_stat_smb_basename(struct connection_struct *conn, const char *fname,
1319                        SMB_STRUCT_STAT *psbuf)
1320 {
1321         struct smb_filename smb_fname = {
1322                         .base_name = discard_const_p(char, fname)
1323         };
1324         int ret;
1325
1326         if (lp_posix_pathnames()) {
1327                 ret = SMB_VFS_LSTAT(conn, &smb_fname);
1328         } else {
1329                 ret = SMB_VFS_STAT(conn, &smb_fname);
1330         }
1331
1332         if (ret != -1) {
1333                 *psbuf = smb_fname.st;
1334         }
1335         return ret;
1336 }
1337
1338 /**
1339  * Ensure LSTAT is called for POSIX paths.
1340  */
1341
1342 NTSTATUS vfs_stat_fsp(files_struct *fsp)
1343 {
1344         int ret;
1345
1346         if(fsp->fh->fd == -1) {
1347                 if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1348                         ret = SMB_VFS_LSTAT(fsp->conn, fsp->fsp_name);
1349                 } else {
1350                         ret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name);
1351                 }
1352                 if (ret == -1) {
1353                         return map_nt_error_from_unix(errno);
1354                 }
1355         } else {
1356                 if(SMB_VFS_FSTAT(fsp, &fsp->fsp_name->st) != 0) {
1357                         return map_nt_error_from_unix(errno);
1358                 }
1359         }
1360         return NT_STATUS_OK;
1361 }
1362
1363 /**
1364  * Initialize num_streams and streams, then call VFS op streaminfo
1365  */
1366 NTSTATUS vfs_streaminfo(connection_struct *conn,
1367                         struct files_struct *fsp,
1368                         const char *fname,
1369                         TALLOC_CTX *mem_ctx,
1370                         unsigned int *num_streams,
1371                         struct stream_struct **streams)
1372 {
1373         *num_streams = 0;
1374         *streams = NULL;
1375         return SMB_VFS_STREAMINFO(conn, fsp, fname, mem_ctx, num_streams, streams);
1376 }
1377
1378 /*
1379   generate a file_id from a stat structure
1380  */
1381 struct file_id vfs_file_id_from_sbuf(connection_struct *conn, const SMB_STRUCT_STAT *sbuf)
1382 {
1383         return SMB_VFS_FILE_ID_CREATE(conn, sbuf);
1384 }
1385
1386 int smb_vfs_call_connect(struct vfs_handle_struct *handle,
1387                          const char *service, const char *user)
1388 {
1389         VFS_FIND(connect);
1390         return handle->fns->connect_fn(handle, service, user);
1391 }
1392
1393 void smb_vfs_call_disconnect(struct vfs_handle_struct *handle)
1394 {
1395         VFS_FIND(disconnect);
1396         handle->fns->disconnect_fn(handle);
1397 }
1398
1399 uint64_t smb_vfs_call_disk_free(struct vfs_handle_struct *handle,
1400                                 const char *path, uint64_t *bsize,
1401                                 uint64_t *dfree, uint64_t *dsize)
1402 {
1403         VFS_FIND(disk_free);
1404         return handle->fns->disk_free_fn(handle, path, bsize, dfree, dsize);
1405 }
1406
1407 int smb_vfs_call_get_quota(struct vfs_handle_struct *handle, const char *path,
1408                            enum SMB_QUOTA_TYPE qtype, unid_t id,
1409                            SMB_DISK_QUOTA *qt)
1410 {
1411         VFS_FIND(get_quota);
1412         return handle->fns->get_quota_fn(handle, path, qtype, id, qt);
1413 }
1414
1415 int smb_vfs_call_set_quota(struct vfs_handle_struct *handle,
1416                            enum SMB_QUOTA_TYPE qtype, unid_t id,
1417                            SMB_DISK_QUOTA *qt)
1418 {
1419         VFS_FIND(set_quota);
1420         return handle->fns->set_quota_fn(handle, qtype, id, qt);
1421 }
1422
1423 int smb_vfs_call_get_shadow_copy_data(struct vfs_handle_struct *handle,
1424                                       struct files_struct *fsp,
1425                                       struct shadow_copy_data *shadow_copy_data,
1426                                       bool labels)
1427 {
1428         VFS_FIND(get_shadow_copy_data);
1429         return handle->fns->get_shadow_copy_data_fn(handle, fsp,
1430                                                     shadow_copy_data,
1431                                                     labels);
1432 }
1433 int smb_vfs_call_statvfs(struct vfs_handle_struct *handle, const char *path,
1434                          struct vfs_statvfs_struct *statbuf)
1435 {
1436         VFS_FIND(statvfs);
1437         return handle->fns->statvfs_fn(handle, path, statbuf);
1438 }
1439
1440 uint32_t smb_vfs_call_fs_capabilities(struct vfs_handle_struct *handle,
1441                         enum timestamp_set_resolution *p_ts_res)
1442 {
1443         VFS_FIND(fs_capabilities);
1444         return handle->fns->fs_capabilities_fn(handle, p_ts_res);
1445 }
1446
1447 NTSTATUS smb_vfs_call_get_dfs_referrals(struct vfs_handle_struct *handle,
1448                                         struct dfs_GetDFSReferral *r)
1449 {
1450         VFS_FIND(get_dfs_referrals);
1451         return handle->fns->get_dfs_referrals_fn(handle, r);
1452 }
1453
1454 DIR *smb_vfs_call_opendir(struct vfs_handle_struct *handle,
1455                                         const struct smb_filename *smb_fname,
1456                                         const char *mask,
1457                                         uint32_t attributes)
1458 {
1459         VFS_FIND(opendir);
1460         return handle->fns->opendir_fn(handle, smb_fname, mask, attributes);
1461 }
1462
1463 DIR *smb_vfs_call_fdopendir(struct vfs_handle_struct *handle,
1464                                         struct files_struct *fsp,
1465                                         const char *mask,
1466                                         uint32_t attributes)
1467 {
1468         VFS_FIND(fdopendir);
1469         return handle->fns->fdopendir_fn(handle, fsp, mask, attributes);
1470 }
1471
1472 struct dirent *smb_vfs_call_readdir(struct vfs_handle_struct *handle,
1473                                               DIR *dirp,
1474                                               SMB_STRUCT_STAT *sbuf)
1475 {
1476         VFS_FIND(readdir);
1477         return handle->fns->readdir_fn(handle, dirp, sbuf);
1478 }
1479
1480 void smb_vfs_call_seekdir(struct vfs_handle_struct *handle,
1481                           DIR *dirp, long offset)
1482 {
1483         VFS_FIND(seekdir);
1484         handle->fns->seekdir_fn(handle, dirp, offset);
1485 }
1486
1487 long smb_vfs_call_telldir(struct vfs_handle_struct *handle,
1488                           DIR *dirp)
1489 {
1490         VFS_FIND(telldir);
1491         return handle->fns->telldir_fn(handle, dirp);
1492 }
1493
1494 void smb_vfs_call_rewind_dir(struct vfs_handle_struct *handle,
1495                              DIR *dirp)
1496 {
1497         VFS_FIND(rewind_dir);
1498         handle->fns->rewind_dir_fn(handle, dirp);
1499 }
1500
1501 int smb_vfs_call_mkdir(struct vfs_handle_struct *handle,
1502                         const struct smb_filename *smb_fname,
1503                         mode_t mode)
1504 {
1505         VFS_FIND(mkdir);
1506         return handle->fns->mkdir_fn(handle, smb_fname, mode);
1507 }
1508
1509 int smb_vfs_call_rmdir(struct vfs_handle_struct *handle,
1510                         const struct smb_filename *smb_fname)
1511 {
1512         VFS_FIND(rmdir);
1513         return handle->fns->rmdir_fn(handle, smb_fname);
1514 }
1515
1516 int smb_vfs_call_closedir(struct vfs_handle_struct *handle,
1517                           DIR *dir)
1518 {
1519         VFS_FIND(closedir);
1520         return handle->fns->closedir_fn(handle, dir);
1521 }
1522
1523 void smb_vfs_call_init_search_op(struct vfs_handle_struct *handle,
1524                                  DIR *dirp)
1525 {
1526         VFS_FIND(init_search_op);
1527         handle->fns->init_search_op_fn(handle, dirp);
1528 }
1529
1530 int smb_vfs_call_open(struct vfs_handle_struct *handle,
1531                       struct smb_filename *smb_fname, struct files_struct *fsp,
1532                       int flags, mode_t mode)
1533 {
1534         VFS_FIND(open);
1535         return handle->fns->open_fn(handle, smb_fname, fsp, flags, mode);
1536 }
1537
1538 NTSTATUS smb_vfs_call_create_file(struct vfs_handle_struct *handle,
1539                                   struct smb_request *req,
1540                                   uint16_t root_dir_fid,
1541                                   struct smb_filename *smb_fname,
1542                                   uint32_t access_mask,
1543                                   uint32_t share_access,
1544                                   uint32_t create_disposition,
1545                                   uint32_t create_options,
1546                                   uint32_t file_attributes,
1547                                   uint32_t oplock_request,
1548                                   struct smb2_lease *lease,
1549                                   uint64_t allocation_size,
1550                                   uint32_t private_flags,
1551                                   struct security_descriptor *sd,
1552                                   struct ea_list *ea_list,
1553                                   files_struct **result,
1554                                   int *pinfo,
1555                                   const struct smb2_create_blobs *in_context_blobs,
1556                                   struct smb2_create_blobs *out_context_blobs)
1557 {
1558         VFS_FIND(create_file);
1559         return handle->fns->create_file_fn(
1560                 handle, req, root_dir_fid, smb_fname, access_mask,
1561                 share_access, create_disposition, create_options,
1562                 file_attributes, oplock_request, lease, allocation_size,
1563                 private_flags, sd, ea_list,
1564                 result, pinfo, in_context_blobs, out_context_blobs);
1565 }
1566
1567 int smb_vfs_call_close(struct vfs_handle_struct *handle,
1568                        struct files_struct *fsp)
1569 {
1570         VFS_FIND(close);
1571         return handle->fns->close_fn(handle, fsp);
1572 }
1573
1574 ssize_t smb_vfs_call_read(struct vfs_handle_struct *handle,
1575                           struct files_struct *fsp, void *data, size_t n)
1576 {
1577         VFS_FIND(read);
1578         return handle->fns->read_fn(handle, fsp, data, n);
1579 }
1580
1581 ssize_t smb_vfs_call_pread(struct vfs_handle_struct *handle,
1582                            struct files_struct *fsp, void *data, size_t n,
1583                            off_t offset)
1584 {
1585         VFS_FIND(pread);
1586         return handle->fns->pread_fn(handle, fsp, data, n, offset);
1587 }
1588
1589 struct smb_vfs_call_pread_state {
1590         ssize_t (*recv_fn)(struct tevent_req *req, struct vfs_aio_state *vfs_aio_state);
1591         ssize_t retval;
1592         struct vfs_aio_state vfs_aio_state;
1593 };
1594
1595 static void smb_vfs_call_pread_done(struct tevent_req *subreq);
1596
1597 struct tevent_req *smb_vfs_call_pread_send(struct vfs_handle_struct *handle,
1598                                            TALLOC_CTX *mem_ctx,
1599                                            struct tevent_context *ev,
1600                                            struct files_struct *fsp,
1601                                            void *data,
1602                                            size_t n, off_t offset)
1603 {
1604         struct tevent_req *req, *subreq;
1605         struct smb_vfs_call_pread_state *state;
1606
1607         req = tevent_req_create(mem_ctx, &state,
1608                                 struct smb_vfs_call_pread_state);
1609         if (req == NULL) {
1610                 return NULL;
1611         }
1612         VFS_FIND(pread_send);
1613         state->recv_fn = handle->fns->pread_recv_fn;
1614
1615         subreq = handle->fns->pread_send_fn(handle, state, ev, fsp, data, n,
1616                                             offset);
1617         if (tevent_req_nomem(subreq, req)) {
1618                 return tevent_req_post(req, ev);
1619         }
1620         tevent_req_set_callback(subreq, smb_vfs_call_pread_done, req);
1621         return req;
1622 }
1623
1624 static void smb_vfs_call_pread_done(struct tevent_req *subreq)
1625 {
1626         struct tevent_req *req = tevent_req_callback_data(
1627                 subreq, struct tevent_req);
1628         struct smb_vfs_call_pread_state *state = tevent_req_data(
1629                 req, struct smb_vfs_call_pread_state);
1630
1631         state->retval = state->recv_fn(subreq, &state->vfs_aio_state);
1632         TALLOC_FREE(subreq);
1633         if (state->retval == -1) {
1634                 tevent_req_error(req, state->vfs_aio_state.error);
1635                 return;
1636         }
1637         tevent_req_done(req);
1638 }
1639
1640 ssize_t SMB_VFS_PREAD_RECV(struct tevent_req *req,
1641                            struct vfs_aio_state *vfs_aio_state)
1642 {
1643         struct smb_vfs_call_pread_state *state = tevent_req_data(
1644                 req, struct smb_vfs_call_pread_state);
1645
1646         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1647                 return -1;
1648         }
1649         *vfs_aio_state = state->vfs_aio_state;
1650         return state->retval;
1651 }
1652
1653 ssize_t smb_vfs_call_write(struct vfs_handle_struct *handle,
1654                            struct files_struct *fsp, const void *data,
1655                            size_t n)
1656 {
1657         VFS_FIND(write);
1658         return handle->fns->write_fn(handle, fsp, data, n);
1659 }
1660
1661 ssize_t smb_vfs_call_pwrite(struct vfs_handle_struct *handle,
1662                             struct files_struct *fsp, const void *data,
1663                             size_t n, off_t offset)
1664 {
1665         VFS_FIND(pwrite);
1666         return handle->fns->pwrite_fn(handle, fsp, data, n, offset);
1667 }
1668
1669 struct smb_vfs_call_pwrite_state {
1670         ssize_t (*recv_fn)(struct tevent_req *req, struct vfs_aio_state *vfs_aio_state);
1671         ssize_t retval;
1672         struct vfs_aio_state vfs_aio_state;
1673 };
1674
1675 static void smb_vfs_call_pwrite_done(struct tevent_req *subreq);
1676
1677 struct tevent_req *smb_vfs_call_pwrite_send(struct vfs_handle_struct *handle,
1678                                             TALLOC_CTX *mem_ctx,
1679                                             struct tevent_context *ev,
1680                                             struct files_struct *fsp,
1681                                             const void *data,
1682                                             size_t n, off_t offset)
1683 {
1684         struct tevent_req *req, *subreq;
1685         struct smb_vfs_call_pwrite_state *state;
1686
1687         req = tevent_req_create(mem_ctx, &state,
1688                                 struct smb_vfs_call_pwrite_state);
1689         if (req == NULL) {
1690                 return NULL;
1691         }
1692         VFS_FIND(pwrite_send);
1693         state->recv_fn = handle->fns->pwrite_recv_fn;
1694
1695         subreq = handle->fns->pwrite_send_fn(handle, state, ev, fsp, data, n,
1696                                              offset);
1697         if (tevent_req_nomem(subreq, req)) {
1698                 return tevent_req_post(req, ev);
1699         }
1700         tevent_req_set_callback(subreq, smb_vfs_call_pwrite_done, req);
1701         return req;
1702 }
1703
1704 static void smb_vfs_call_pwrite_done(struct tevent_req *subreq)
1705 {
1706         struct tevent_req *req = tevent_req_callback_data(
1707                 subreq, struct tevent_req);
1708         struct smb_vfs_call_pwrite_state *state = tevent_req_data(
1709                 req, struct smb_vfs_call_pwrite_state);
1710
1711         state->retval = state->recv_fn(subreq, &state->vfs_aio_state);
1712         TALLOC_FREE(subreq);
1713         if (state->retval == -1) {
1714                 tevent_req_error(req, state->vfs_aio_state.error);
1715                 return;
1716         }
1717         tevent_req_done(req);
1718 }
1719
1720 ssize_t SMB_VFS_PWRITE_RECV(struct tevent_req *req,
1721                             struct vfs_aio_state *vfs_aio_state)
1722 {
1723         struct smb_vfs_call_pwrite_state *state = tevent_req_data(
1724                 req, struct smb_vfs_call_pwrite_state);
1725
1726         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1727                 return -1;
1728         }
1729         *vfs_aio_state = state->vfs_aio_state;
1730         return state->retval;
1731 }
1732
1733 off_t smb_vfs_call_lseek(struct vfs_handle_struct *handle,
1734                              struct files_struct *fsp, off_t offset,
1735                              int whence)
1736 {
1737         VFS_FIND(lseek);
1738         return handle->fns->lseek_fn(handle, fsp, offset, whence);
1739 }
1740
1741 ssize_t smb_vfs_call_sendfile(struct vfs_handle_struct *handle, int tofd,
1742                               files_struct *fromfsp, const DATA_BLOB *header,
1743                               off_t offset, size_t count)
1744 {
1745         VFS_FIND(sendfile);
1746         return handle->fns->sendfile_fn(handle, tofd, fromfsp, header, offset,
1747                                         count);
1748 }
1749
1750 ssize_t smb_vfs_call_recvfile(struct vfs_handle_struct *handle, int fromfd,
1751                               files_struct *tofsp, off_t offset,
1752                               size_t count)
1753 {
1754         VFS_FIND(recvfile);
1755         return handle->fns->recvfile_fn(handle, fromfd, tofsp, offset, count);
1756 }
1757
1758 int smb_vfs_call_rename(struct vfs_handle_struct *handle,
1759                         const struct smb_filename *smb_fname_src,
1760                         const struct smb_filename *smb_fname_dst)
1761 {
1762         VFS_FIND(rename);
1763         return handle->fns->rename_fn(handle, smb_fname_src, smb_fname_dst);
1764 }
1765
1766 int smb_vfs_call_fsync(struct vfs_handle_struct *handle,
1767                        struct files_struct *fsp)
1768 {
1769         VFS_FIND(fsync);
1770         return handle->fns->fsync_fn(handle, fsp);
1771 }
1772
1773 struct smb_vfs_call_fsync_state {
1774         int (*recv_fn)(struct tevent_req *req, struct vfs_aio_state *vfs_aio_state);
1775         int retval;
1776         struct vfs_aio_state vfs_aio_state;
1777 };
1778
1779 static void smb_vfs_call_fsync_done(struct tevent_req *subreq);
1780
1781 struct tevent_req *smb_vfs_call_fsync_send(struct vfs_handle_struct *handle,
1782                                            TALLOC_CTX *mem_ctx,
1783                                            struct tevent_context *ev,
1784                                            struct files_struct *fsp)
1785 {
1786         struct tevent_req *req, *subreq;
1787         struct smb_vfs_call_fsync_state *state;
1788
1789         req = tevent_req_create(mem_ctx, &state,
1790                                 struct smb_vfs_call_fsync_state);
1791         if (req == NULL) {
1792                 return NULL;
1793         }
1794         VFS_FIND(fsync_send);
1795         state->recv_fn = handle->fns->fsync_recv_fn;
1796
1797         subreq = handle->fns->fsync_send_fn(handle, state, ev, fsp);
1798         if (tevent_req_nomem(subreq, req)) {
1799                 return tevent_req_post(req, ev);
1800         }
1801         tevent_req_set_callback(subreq, smb_vfs_call_fsync_done, req);
1802         return req;
1803 }
1804
1805 static void smb_vfs_call_fsync_done(struct tevent_req *subreq)
1806 {
1807         struct tevent_req *req = tevent_req_callback_data(
1808                 subreq, struct tevent_req);
1809         struct smb_vfs_call_fsync_state *state = tevent_req_data(
1810                 req, struct smb_vfs_call_fsync_state);
1811
1812         state->retval = state->recv_fn(subreq, &state->vfs_aio_state);
1813         TALLOC_FREE(subreq);
1814         if (state->retval == -1) {
1815                 tevent_req_error(req, state->vfs_aio_state.error);
1816                 return;
1817         }
1818         tevent_req_done(req);
1819 }
1820
1821 int SMB_VFS_FSYNC_RECV(struct tevent_req *req, struct vfs_aio_state *vfs_aio_state)
1822 {
1823         struct smb_vfs_call_fsync_state *state = tevent_req_data(
1824                 req, struct smb_vfs_call_fsync_state);
1825
1826         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1827                 return -1;
1828         }
1829         *vfs_aio_state = state->vfs_aio_state;
1830         return state->retval;
1831 }
1832
1833
1834 int smb_vfs_call_stat(struct vfs_handle_struct *handle,
1835                       struct smb_filename *smb_fname)
1836 {
1837         VFS_FIND(stat);
1838         return handle->fns->stat_fn(handle, smb_fname);
1839 }
1840
1841 int smb_vfs_call_fstat(struct vfs_handle_struct *handle,
1842                        struct files_struct *fsp, SMB_STRUCT_STAT *sbuf)
1843 {
1844         VFS_FIND(fstat);
1845         return handle->fns->fstat_fn(handle, fsp, sbuf);
1846 }
1847
1848 int smb_vfs_call_lstat(struct vfs_handle_struct *handle,
1849                        struct smb_filename *smb_filename)
1850 {
1851         VFS_FIND(lstat);
1852         return handle->fns->lstat_fn(handle, smb_filename);
1853 }
1854
1855 uint64_t smb_vfs_call_get_alloc_size(struct vfs_handle_struct *handle,
1856                                      struct files_struct *fsp,
1857                                      const SMB_STRUCT_STAT *sbuf)
1858 {
1859         VFS_FIND(get_alloc_size);
1860         return handle->fns->get_alloc_size_fn(handle, fsp, sbuf);
1861 }
1862
1863 int smb_vfs_call_unlink(struct vfs_handle_struct *handle,
1864                         const struct smb_filename *smb_fname)
1865 {
1866         VFS_FIND(unlink);
1867         return handle->fns->unlink_fn(handle, smb_fname);
1868 }
1869
1870 int smb_vfs_call_chmod(struct vfs_handle_struct *handle,
1871                         const struct smb_filename *smb_fname,
1872                         mode_t mode)
1873 {
1874         VFS_FIND(chmod);
1875         return handle->fns->chmod_fn(handle, smb_fname, mode);
1876 }
1877
1878 int smb_vfs_call_fchmod(struct vfs_handle_struct *handle,
1879                         struct files_struct *fsp, mode_t mode)
1880 {
1881         VFS_FIND(fchmod);
1882         return handle->fns->fchmod_fn(handle, fsp, mode);
1883 }
1884
1885 int smb_vfs_call_chown(struct vfs_handle_struct *handle, const char *path,
1886                        uid_t uid, gid_t gid)
1887 {
1888         VFS_FIND(chown);
1889         return handle->fns->chown_fn(handle, path, uid, gid);
1890 }
1891
1892 int smb_vfs_call_fchown(struct vfs_handle_struct *handle,
1893                         struct files_struct *fsp, uid_t uid, gid_t gid)
1894 {
1895         VFS_FIND(fchown);
1896         return handle->fns->fchown_fn(handle, fsp, uid, gid);
1897 }
1898
1899 int smb_vfs_call_lchown(struct vfs_handle_struct *handle, const char *path,
1900                         uid_t uid, gid_t gid)
1901 {
1902         VFS_FIND(lchown);
1903         return handle->fns->lchown_fn(handle, path, uid, gid);
1904 }
1905
1906 NTSTATUS vfs_chown_fsp(files_struct *fsp, uid_t uid, gid_t gid)
1907 {
1908         int ret;
1909         bool as_root = false;
1910         const char *path;
1911         char *saved_dir = NULL;
1912         char *parent_dir = NULL;
1913         NTSTATUS status;
1914
1915         if (fsp->fh->fd != -1) {
1916                 /* Try fchown. */
1917                 ret = SMB_VFS_FCHOWN(fsp, uid, gid);
1918                 if (ret == 0) {
1919                         return NT_STATUS_OK;
1920                 }
1921                 if (ret == -1 && errno != ENOSYS) {
1922                         return map_nt_error_from_unix(errno);
1923                 }
1924         }
1925
1926         as_root = (geteuid() == 0);
1927
1928         if (as_root) {
1929                 /*
1930                  * We are being asked to chown as root. Make
1931                  * sure we chdir() into the path to pin it,
1932                  * and always act using lchown to ensure we
1933                  * don't deref any symbolic links.
1934                  */
1935                 const char *final_component = NULL;
1936                 struct smb_filename local_fname;
1937
1938                 saved_dir = vfs_GetWd(talloc_tos(),fsp->conn);
1939                 if (!saved_dir) {
1940                         status = map_nt_error_from_unix(errno);
1941                         DEBUG(0,("vfs_chown_fsp: failed to get "
1942                                 "current working directory. Error was %s\n",
1943                                 strerror(errno)));
1944                         return status;
1945                 }
1946
1947                 if (!parent_dirname(talloc_tos(),
1948                                 fsp->fsp_name->base_name,
1949                                 &parent_dir,
1950                                 &final_component)) {
1951                         return NT_STATUS_NO_MEMORY;
1952                 }
1953
1954                 /* cd into the parent dir to pin it. */
1955                 ret = vfs_ChDir(fsp->conn, parent_dir);
1956                 if (ret == -1) {
1957                         return map_nt_error_from_unix(errno);
1958                 }
1959
1960                 ZERO_STRUCT(local_fname);
1961                 local_fname.base_name = discard_const_p(char, final_component);
1962
1963                 /* Must use lstat here. */
1964                 ret = SMB_VFS_LSTAT(fsp->conn, &local_fname);
1965                 if (ret == -1) {
1966                         status = map_nt_error_from_unix(errno);
1967                         goto out;
1968                 }
1969
1970                 /* Ensure it matches the fsp stat. */
1971                 if (!check_same_stat(&local_fname.st, &fsp->fsp_name->st)) {
1972                         status = NT_STATUS_ACCESS_DENIED;
1973                         goto out;
1974                 }
1975                 path = final_component;
1976         } else {
1977                 path = fsp->fsp_name->base_name;
1978         }
1979
1980         if ((fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) || as_root) {
1981                 ret = SMB_VFS_LCHOWN(fsp->conn,
1982                         path,
1983                         uid, gid);
1984         } else {
1985                 ret = SMB_VFS_CHOWN(fsp->conn,
1986                         path,
1987                         uid, gid);
1988         }
1989
1990         if (ret == 0) {
1991                 status = NT_STATUS_OK;
1992         } else {
1993                 status = map_nt_error_from_unix(errno);
1994         }
1995
1996   out:
1997
1998         if (as_root) {
1999                 vfs_ChDir(fsp->conn,saved_dir);
2000                 TALLOC_FREE(saved_dir);
2001                 TALLOC_FREE(parent_dir);
2002         }
2003         return status;
2004 }
2005
2006 int smb_vfs_call_chdir(struct vfs_handle_struct *handle, const char *path)
2007 {
2008         VFS_FIND(chdir);
2009         return handle->fns->chdir_fn(handle, path);
2010 }
2011
2012 char *smb_vfs_call_getwd(struct vfs_handle_struct *handle)
2013 {
2014         VFS_FIND(getwd);
2015         return handle->fns->getwd_fn(handle);
2016 }
2017
2018 int smb_vfs_call_ntimes(struct vfs_handle_struct *handle,
2019                         const struct smb_filename *smb_fname,
2020                         struct smb_file_time *ft)
2021 {
2022         VFS_FIND(ntimes);
2023         return handle->fns->ntimes_fn(handle, smb_fname, ft);
2024 }
2025
2026 int smb_vfs_call_ftruncate(struct vfs_handle_struct *handle,
2027                            struct files_struct *fsp, off_t offset)
2028 {
2029         VFS_FIND(ftruncate);
2030         return handle->fns->ftruncate_fn(handle, fsp, offset);
2031 }
2032
2033 int smb_vfs_call_fallocate(struct vfs_handle_struct *handle,
2034                            struct files_struct *fsp,
2035                            uint32_t mode,
2036                            off_t offset,
2037                            off_t len)
2038 {
2039         VFS_FIND(fallocate);
2040         return handle->fns->fallocate_fn(handle, fsp, mode, offset, len);
2041 }
2042
2043 int smb_vfs_call_kernel_flock(struct vfs_handle_struct *handle,
2044                               struct files_struct *fsp, uint32_t share_mode,
2045                               uint32_t access_mask)
2046 {
2047         VFS_FIND(kernel_flock);
2048         return handle->fns->kernel_flock_fn(handle, fsp, share_mode,
2049                                          access_mask);
2050 }
2051
2052 int smb_vfs_call_linux_setlease(struct vfs_handle_struct *handle,
2053                                 struct files_struct *fsp, int leasetype)
2054 {
2055         VFS_FIND(linux_setlease);
2056         return handle->fns->linux_setlease_fn(handle, fsp, leasetype);
2057 }
2058
2059 int smb_vfs_call_symlink(struct vfs_handle_struct *handle, const char *oldpath,
2060                          const char *newpath)
2061 {
2062         VFS_FIND(symlink);
2063         return handle->fns->symlink_fn(handle, oldpath, newpath);
2064 }
2065
2066 int smb_vfs_call_readlink(struct vfs_handle_struct *handle,
2067                               const char *path, char *buf, size_t bufsiz)
2068 {
2069         VFS_FIND(readlink);
2070         return handle->fns->readlink_fn(handle, path, buf, bufsiz);
2071 }
2072
2073 int smb_vfs_call_link(struct vfs_handle_struct *handle, const char *oldpath,
2074                       const char *newpath)
2075 {
2076         VFS_FIND(link);
2077         return handle->fns->link_fn(handle, oldpath, newpath);
2078 }
2079
2080 int smb_vfs_call_mknod(struct vfs_handle_struct *handle, const char *path,
2081                        mode_t mode, SMB_DEV_T dev)
2082 {
2083         VFS_FIND(mknod);
2084         return handle->fns->mknod_fn(handle, path, mode, dev);
2085 }
2086
2087 char *smb_vfs_call_realpath(struct vfs_handle_struct *handle, const char *path)
2088 {
2089         VFS_FIND(realpath);
2090         return handle->fns->realpath_fn(handle, path);
2091 }
2092
2093 int smb_vfs_call_chflags(struct vfs_handle_struct *handle, const char *path,
2094                          unsigned int flags)
2095 {
2096         VFS_FIND(chflags);
2097         return handle->fns->chflags_fn(handle, path, flags);
2098 }
2099
2100 struct file_id smb_vfs_call_file_id_create(struct vfs_handle_struct *handle,
2101                                            const SMB_STRUCT_STAT *sbuf)
2102 {
2103         VFS_FIND(file_id_create);
2104         return handle->fns->file_id_create_fn(handle, sbuf);
2105 }
2106
2107 NTSTATUS smb_vfs_call_streaminfo(struct vfs_handle_struct *handle,
2108                                  struct files_struct *fsp,
2109                                  const char *fname,
2110                                  TALLOC_CTX *mem_ctx,
2111                                  unsigned int *num_streams,
2112                                  struct stream_struct **streams)
2113 {
2114         VFS_FIND(streaminfo);
2115         return handle->fns->streaminfo_fn(handle, fsp, fname, mem_ctx,
2116                                           num_streams, streams);
2117 }
2118
2119 int smb_vfs_call_get_real_filename(struct vfs_handle_struct *handle,
2120                                    const char *path, const char *name,
2121                                    TALLOC_CTX *mem_ctx, char **found_name)
2122 {
2123         VFS_FIND(get_real_filename);
2124         return handle->fns->get_real_filename_fn(handle, path, name, mem_ctx,
2125                                                  found_name);
2126 }
2127
2128 const char *smb_vfs_call_connectpath(struct vfs_handle_struct *handle,
2129                                      const char *filename)
2130 {
2131         VFS_FIND(connectpath);
2132         return handle->fns->connectpath_fn(handle, filename);
2133 }
2134
2135 bool smb_vfs_call_strict_lock(struct vfs_handle_struct *handle,
2136                               struct files_struct *fsp,
2137                               struct lock_struct *plock)
2138 {
2139         VFS_FIND(strict_lock);
2140         return handle->fns->strict_lock_fn(handle, fsp, plock);
2141 }
2142
2143 void smb_vfs_call_strict_unlock(struct vfs_handle_struct *handle,
2144                                 struct files_struct *fsp,
2145                                 struct lock_struct *plock)
2146 {
2147         VFS_FIND(strict_unlock);
2148         handle->fns->strict_unlock_fn(handle, fsp, plock);
2149 }
2150
2151 NTSTATUS smb_vfs_call_translate_name(struct vfs_handle_struct *handle,
2152                                      const char *name,
2153                                      enum vfs_translate_direction direction,
2154                                      TALLOC_CTX *mem_ctx,
2155                                      char **mapped_name)
2156 {
2157         VFS_FIND(translate_name);
2158         return handle->fns->translate_name_fn(handle, name, direction, mem_ctx,
2159                                               mapped_name);
2160 }
2161
2162 NTSTATUS smb_vfs_call_fsctl(struct vfs_handle_struct *handle,
2163                             struct files_struct *fsp,
2164                             TALLOC_CTX *ctx,
2165                             uint32_t function,
2166                             uint16_t req_flags,
2167                             const uint8_t *in_data,
2168                             uint32_t in_len,
2169                             uint8_t **out_data,
2170                             uint32_t max_out_len,
2171                             uint32_t *out_len)
2172 {
2173         VFS_FIND(fsctl);
2174         return handle->fns->fsctl_fn(handle, fsp, ctx, function, req_flags,
2175                                      in_data, in_len, out_data, max_out_len,
2176                                      out_len);
2177 }
2178
2179 struct tevent_req *smb_vfs_call_copy_chunk_send(struct vfs_handle_struct *handle,
2180                                                 TALLOC_CTX *mem_ctx,
2181                                                 struct tevent_context *ev,
2182                                                 struct files_struct *src_fsp,
2183                                                 off_t src_off,
2184                                                 struct files_struct *dest_fsp,
2185                                                 off_t dest_off,
2186                                                 off_t num)
2187 {
2188         VFS_FIND(copy_chunk_send);
2189         return handle->fns->copy_chunk_send_fn(handle, mem_ctx, ev, src_fsp,
2190                                                src_off, dest_fsp, dest_off, num);
2191 }
2192
2193 NTSTATUS smb_vfs_call_copy_chunk_recv(struct vfs_handle_struct *handle,
2194                                       struct tevent_req *req,
2195                                       off_t *copied)
2196 {
2197         VFS_FIND(copy_chunk_recv);
2198         return handle->fns->copy_chunk_recv_fn(handle, req, copied);
2199 }
2200
2201 NTSTATUS smb_vfs_call_get_compression(vfs_handle_struct *handle,
2202                                       TALLOC_CTX *mem_ctx,
2203                                       struct files_struct *fsp,
2204                                       struct smb_filename *smb_fname,
2205                                       uint16_t *_compression_fmt)
2206 {
2207         VFS_FIND(get_compression);
2208         return handle->fns->get_compression_fn(handle, mem_ctx, fsp, smb_fname,
2209                                                _compression_fmt);
2210 }
2211
2212 NTSTATUS smb_vfs_call_set_compression(vfs_handle_struct *handle,
2213                                       TALLOC_CTX *mem_ctx,
2214                                       struct files_struct *fsp,
2215                                       uint16_t compression_fmt)
2216 {
2217         VFS_FIND(set_compression);
2218         return handle->fns->set_compression_fn(handle, mem_ctx, fsp,
2219                                                compression_fmt);
2220 }
2221
2222 NTSTATUS smb_vfs_call_snap_check_path(vfs_handle_struct *handle,
2223                                       TALLOC_CTX *mem_ctx,
2224                                       const char *service_path,
2225                                       char **base_volume)
2226 {
2227         VFS_FIND(snap_check_path);
2228         return handle->fns->snap_check_path_fn(handle, mem_ctx, service_path,
2229                                                base_volume);
2230 }
2231
2232 NTSTATUS smb_vfs_call_snap_create(struct vfs_handle_struct *handle,
2233                                   TALLOC_CTX *mem_ctx,
2234                                   const char *base_volume,
2235                                   time_t *tstamp,
2236                                   bool rw,
2237                                   char **base_path,
2238                                   char **snap_path)
2239 {
2240         VFS_FIND(snap_create);
2241         return handle->fns->snap_create_fn(handle, mem_ctx, base_volume, tstamp,
2242                                            rw, base_path, snap_path);
2243 }
2244
2245 NTSTATUS smb_vfs_call_snap_delete(struct vfs_handle_struct *handle,
2246                                   TALLOC_CTX *mem_ctx,
2247                                   char *base_path,
2248                                   char *snap_path)
2249 {
2250         VFS_FIND(snap_delete);
2251         return handle->fns->snap_delete_fn(handle, mem_ctx, base_path,
2252                                            snap_path);
2253 }
2254
2255 NTSTATUS smb_vfs_call_fget_nt_acl(struct vfs_handle_struct *handle,
2256                                   struct files_struct *fsp,
2257                                   uint32_t security_info,
2258                                   TALLOC_CTX *mem_ctx,
2259                                   struct security_descriptor **ppdesc)
2260 {
2261         VFS_FIND(fget_nt_acl);
2262         return handle->fns->fget_nt_acl_fn(handle, fsp, security_info,
2263                                            mem_ctx, ppdesc);
2264 }
2265
2266 NTSTATUS smb_vfs_call_get_nt_acl(struct vfs_handle_struct *handle,
2267                                  const struct smb_filename *smb_fname,
2268                                  uint32_t security_info,
2269                                  TALLOC_CTX *mem_ctx,
2270                                  struct security_descriptor **ppdesc)
2271 {
2272         VFS_FIND(get_nt_acl);
2273         return handle->fns->get_nt_acl_fn(handle,
2274                                 smb_fname,
2275                                 security_info,
2276                                 mem_ctx,
2277                                 ppdesc);
2278 }
2279
2280 NTSTATUS smb_vfs_call_fset_nt_acl(struct vfs_handle_struct *handle,
2281                                   struct files_struct *fsp,
2282                                   uint32_t security_info_sent,
2283                                   const struct security_descriptor *psd)
2284 {
2285         VFS_FIND(fset_nt_acl);
2286         return handle->fns->fset_nt_acl_fn(handle, fsp, security_info_sent,
2287                                            psd);
2288 }
2289
2290 NTSTATUS smb_vfs_call_audit_file(struct vfs_handle_struct *handle,
2291                                  struct smb_filename *file,
2292                                  struct security_acl *sacl,
2293                                  uint32_t access_requested,
2294                                  uint32_t access_denied)
2295 {
2296         VFS_FIND(audit_file);
2297         return handle->fns->audit_file_fn(handle,
2298                                           file,
2299                                           sacl,
2300                                           access_requested,
2301                                           access_denied);
2302 }
2303
2304 int smb_vfs_call_chmod_acl(struct vfs_handle_struct *handle,
2305                 const struct smb_filename *smb_fname,
2306                 mode_t mode)
2307 {
2308         VFS_FIND(chmod_acl);
2309         return handle->fns->chmod_acl_fn(handle, smb_fname, mode);
2310 }
2311
2312 int smb_vfs_call_fchmod_acl(struct vfs_handle_struct *handle,
2313                             struct files_struct *fsp, mode_t mode)
2314 {
2315         VFS_FIND(fchmod_acl);
2316         return handle->fns->fchmod_acl_fn(handle, fsp, mode);
2317 }
2318
2319 SMB_ACL_T smb_vfs_call_sys_acl_get_file(struct vfs_handle_struct *handle,
2320                                         const char *path_p,
2321                                         SMB_ACL_TYPE_T type,
2322                                         TALLOC_CTX *mem_ctx)
2323 {
2324         VFS_FIND(sys_acl_get_file);
2325         return handle->fns->sys_acl_get_file_fn(handle, path_p, type, mem_ctx);
2326 }
2327
2328 SMB_ACL_T smb_vfs_call_sys_acl_get_fd(struct vfs_handle_struct *handle,
2329                                       struct files_struct *fsp,
2330                                       TALLOC_CTX *mem_ctx)
2331 {
2332         VFS_FIND(sys_acl_get_fd);
2333         return handle->fns->sys_acl_get_fd_fn(handle, fsp, mem_ctx);
2334 }
2335
2336 int smb_vfs_call_sys_acl_blob_get_file(struct vfs_handle_struct *handle,
2337                                        const char *path_p,
2338                                        TALLOC_CTX *mem_ctx,
2339                                        char **blob_description,
2340                                        DATA_BLOB *blob)
2341 {
2342         VFS_FIND(sys_acl_blob_get_file);
2343         return handle->fns->sys_acl_blob_get_file_fn(handle, path_p, mem_ctx, blob_description, blob);
2344 }
2345
2346 int smb_vfs_call_sys_acl_blob_get_fd(struct vfs_handle_struct *handle,
2347                                      struct files_struct *fsp,
2348                                      TALLOC_CTX *mem_ctx,
2349                                      char **blob_description,
2350                                      DATA_BLOB *blob)
2351 {
2352         VFS_FIND(sys_acl_blob_get_fd);
2353         return handle->fns->sys_acl_blob_get_fd_fn(handle, fsp, mem_ctx, blob_description, blob);
2354 }
2355
2356 int smb_vfs_call_sys_acl_set_file(struct vfs_handle_struct *handle,
2357                                   const char *name, SMB_ACL_TYPE_T acltype,
2358                                   SMB_ACL_T theacl)
2359 {
2360         VFS_FIND(sys_acl_set_file);
2361         return handle->fns->sys_acl_set_file_fn(handle, name, acltype, theacl);
2362 }
2363
2364 int smb_vfs_call_sys_acl_set_fd(struct vfs_handle_struct *handle,
2365                                 struct files_struct *fsp, SMB_ACL_T theacl)
2366 {
2367         VFS_FIND(sys_acl_set_fd);
2368         return handle->fns->sys_acl_set_fd_fn(handle, fsp, theacl);
2369 }
2370
2371 int smb_vfs_call_sys_acl_delete_def_file(struct vfs_handle_struct *handle,
2372                                          const char *path)
2373 {
2374         VFS_FIND(sys_acl_delete_def_file);
2375         return handle->fns->sys_acl_delete_def_file_fn(handle, path);
2376 }
2377
2378 ssize_t smb_vfs_call_getxattr(struct vfs_handle_struct *handle,
2379                               const char *path, const char *name, void *value,
2380                               size_t size)
2381 {
2382         VFS_FIND(getxattr);
2383         return handle->fns->getxattr_fn(handle, path, name, value, size);
2384 }
2385
2386 ssize_t smb_vfs_call_fgetxattr(struct vfs_handle_struct *handle,
2387                                struct files_struct *fsp, const char *name,
2388                                void *value, size_t size)
2389 {
2390         VFS_FIND(fgetxattr);
2391         return handle->fns->fgetxattr_fn(handle, fsp, name, value, size);
2392 }
2393
2394 ssize_t smb_vfs_call_listxattr(struct vfs_handle_struct *handle,
2395                                const char *path, char *list, size_t size)
2396 {
2397         VFS_FIND(listxattr);
2398         return handle->fns->listxattr_fn(handle, path, list, size);
2399 }
2400
2401 ssize_t smb_vfs_call_flistxattr(struct vfs_handle_struct *handle,
2402                                 struct files_struct *fsp, char *list,
2403                                 size_t size)
2404 {
2405         VFS_FIND(flistxattr);
2406         return handle->fns->flistxattr_fn(handle, fsp, list, size);
2407 }
2408
2409 int smb_vfs_call_removexattr(struct vfs_handle_struct *handle,
2410                              const char *path, const char *name)
2411 {
2412         VFS_FIND(removexattr);
2413         return handle->fns->removexattr_fn(handle, path, name);
2414 }
2415
2416 int smb_vfs_call_fremovexattr(struct vfs_handle_struct *handle,
2417                               struct files_struct *fsp, const char *name)
2418 {
2419         VFS_FIND(fremovexattr);
2420         return handle->fns->fremovexattr_fn(handle, fsp, name);
2421 }
2422
2423 int smb_vfs_call_setxattr(struct vfs_handle_struct *handle, const char *path,
2424                           const char *name, const void *value, size_t size,
2425                           int flags)
2426 {
2427         VFS_FIND(setxattr);
2428         return handle->fns->setxattr_fn(handle, path, name, value, size, flags);
2429 }
2430
2431 int smb_vfs_call_fsetxattr(struct vfs_handle_struct *handle,
2432                            struct files_struct *fsp, const char *name,
2433                            const void *value, size_t size, int flags)
2434 {
2435         VFS_FIND(fsetxattr);
2436         return handle->fns->fsetxattr_fn(handle, fsp, name, value, size, flags);
2437 }
2438
2439 bool smb_vfs_call_aio_force(struct vfs_handle_struct *handle,
2440                             struct files_struct *fsp)
2441 {
2442         VFS_FIND(aio_force);
2443         return handle->fns->aio_force_fn(handle, fsp);
2444 }
2445
2446 bool smb_vfs_call_is_offline(struct vfs_handle_struct *handle,
2447                              const struct smb_filename *fname,
2448                              SMB_STRUCT_STAT *sbuf)
2449 {
2450         VFS_FIND(is_offline);
2451         return handle->fns->is_offline_fn(handle, fname, sbuf);
2452 }
2453
2454 int smb_vfs_call_set_offline(struct vfs_handle_struct *handle,
2455                              const struct smb_filename *fname)
2456 {
2457         VFS_FIND(set_offline);
2458         return handle->fns->set_offline_fn(handle, fname);
2459 }
2460
2461 NTSTATUS smb_vfs_call_durable_cookie(struct vfs_handle_struct *handle,
2462                                      struct files_struct *fsp,
2463                                      TALLOC_CTX *mem_ctx,
2464                                      DATA_BLOB *cookie)
2465 {
2466         VFS_FIND(durable_cookie);
2467         return handle->fns->durable_cookie_fn(handle, fsp, mem_ctx, cookie);
2468 }
2469
2470 NTSTATUS smb_vfs_call_durable_disconnect(struct vfs_handle_struct *handle,
2471                                          struct files_struct *fsp,
2472                                          const DATA_BLOB old_cookie,
2473                                          TALLOC_CTX *mem_ctx,
2474                                          DATA_BLOB *new_cookie)
2475 {
2476         VFS_FIND(durable_disconnect);
2477         return handle->fns->durable_disconnect_fn(handle, fsp, old_cookie,
2478                                                   mem_ctx, new_cookie);
2479 }
2480
2481 NTSTATUS smb_vfs_call_durable_reconnect(struct vfs_handle_struct *handle,
2482                                         struct smb_request *smb1req,
2483                                         struct smbXsrv_open *op,
2484                                         const DATA_BLOB old_cookie,
2485                                         TALLOC_CTX *mem_ctx,
2486                                         struct files_struct **fsp,
2487                                         DATA_BLOB *new_cookie)
2488 {
2489         VFS_FIND(durable_reconnect);
2490         return handle->fns->durable_reconnect_fn(handle, smb1req, op,
2491                                                  old_cookie, mem_ctx, fsp,
2492                                                  new_cookie);
2493 }
2494
2495 NTSTATUS smb_vfs_call_readdir_attr(struct vfs_handle_struct *handle,
2496                                    const struct smb_filename *fname,
2497                                    TALLOC_CTX *mem_ctx,
2498                                    struct readdir_attr_data **attr_data)
2499 {
2500         VFS_FIND(readdir_attr);
2501         return handle->fns->readdir_attr_fn(handle, fname, mem_ctx, attr_data);
2502 }