source3/libsmb/libsmb_file.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    SMB client library implementation
   4    Copyright (C) Andrew Tridgell 1998
   5    Copyright (C) Richard Sharpe 2000, 2002
   6    Copyright (C) John Terpstra 2000
   7    Copyright (C) Tom Jansen (Ninja ISD) 2002
   8    Copyright (C) Derrell Lipman 2003-2008
   9    Copyright (C) Jeremy Allison 2007, 2008
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "libsmb/libsmb.h"
  27 #include "libsmbclient.h"
  28 #include "libsmb_internal.h"
  29 #include "../libcli/smb/smbXcli_base.h"
  30
  31 /*
  32  * Routine to open() a file ...
  33  */
  34
  35 SMBCFILE *
  36 SMBC_open_ctx(SMBCCTX *context,
  37               const char *fname,
  38               int flags,
  39               mode_t mode)
  40 {
  41         char *server = NULL;
  42         char *share = NULL;
  43         char *user = NULL;
  44         char *password = NULL;
  45         char *workgroup = NULL;
  46         char *path = NULL;
  47         char *targetpath = NULL;
  48         struct cli_state *targetcli = NULL;
  49         SMBCSRV *srv   = NULL;
  50         SMBCFILE *file = NULL;
  51         uint16_t fd;
  52         uint16_t port = 0;
  53         NTSTATUS status = NT_STATUS_OBJECT_PATH_INVALID;
  54         TALLOC_CTX *frame = talloc_stackframe();
  55
  56         if (!context || !context->internal->initialized) {
  57                 errno = EINVAL;  /* Best I can think of ... */
  58                 TALLOC_FREE(frame);
  59                 return NULL;
  60         }
  61
  62         if (!fname) {
  63                 errno = EINVAL;
  64                 TALLOC_FREE(frame);
  65                 return NULL;
  66         }
  67
  68         if (SMBC_parse_path(frame,
  69                             context,
  70                             fname,
  71                             &workgroup,
  72                             &server,
  73                             &port,
  74                             &share,
  75                             &path,
  76                             &user,
  77                             &password,
  78                             NULL)) {
  79                 errno = EINVAL;
  80                 TALLOC_FREE(frame);
  81                 return NULL;
  82         }
  83
  84         if (!user || user[0] == (char)0) {
  85                 user = talloc_strdup(frame, smbc_getUser(context));
  86                 if (!user) {
  87                         errno = ENOMEM;
  88                         TALLOC_FREE(frame);
  89                         return NULL;
  90                 }
  91         }
  92
  93         srv = SMBC_server(frame, context, True,
  94                           server, port, share, &workgroup, &user, &password);
  95         if (!srv) {
  96                 if (errno == EPERM) errno = EACCES;
  97                 TALLOC_FREE(frame);
  98                 return NULL;  /* SMBC_server sets errno */
  99         }
 100
 101         /* Hmmm, the test for a directory is suspect here ... FIXME */
 102
 103         if (strlen(path) > 0 && path[strlen(path) - 1] == '\\') {
 104                 status = NT_STATUS_OBJECT_PATH_INVALID;
 105         } else {
 106                 file = SMB_MALLOC_P(SMBCFILE);
 107                 if (!file) {
 108                         errno = ENOMEM;
 109                         TALLOC_FREE(frame);
 110                         return NULL;
 111                 }
 112
 113                 ZERO_STRUCTP(file);
 114
 115                 /*d_printf(">>>open: resolving %s\n", path);*/
 116                 status = cli_resolve_path(
 117                         frame, "", context->internal->auth_info,
 118                         srv->cli, path, &targetcli, &targetpath);
 119                 if (!NT_STATUS_IS_OK(status)) {
 120                         d_printf("Could not resolve %s\n", path);
 121                         errno = ENOENT;
 122                         SAFE_FREE(file);
 123                         TALLOC_FREE(frame);
 124                         return NULL;
 125                 }
 126                 /*d_printf(">>>open: resolved %s as %s\n", path, targetpath);*/
 127
 128                 status = cli_open(targetcli, targetpath, flags,
 129                                    context->internal->share_mode, &fd);
 130                 if (!NT_STATUS_IS_OK(status)) {
 131
 132                         /* Handle the error ... */
 133
 134                         SAFE_FREE(file);
 135                         errno = SMBC_errno(context, targetcli);
 136                         TALLOC_FREE(frame);
 137                         return NULL;
 138                 }
 139
 140                 /* Fill in file struct */
 141
 142                 file->cli_fd  = fd;
 143                 file->fname   = SMB_STRDUP(fname);
 144                 file->srv     = srv;
 145                 file->offset  = 0;
 146                 file->file    = True;
 147                 /*
 148                  * targetcli is either equal to srv->cli or
 149                  * is a subsidiary DFS connection. Either way
 150                  * file->cli_fd belongs to it so we must cache
 151                  * it for read/write/close, not re-resolve each time.
 152                  * Re-resolving is both slow and incorrect.
 153                  */
 154                 file->targetcli = targetcli;
 155
 156                 DLIST_ADD(context->internal->files, file);
 157
 158                 /*
 159                  * If the file was opened in O_APPEND mode, all write
 160                  * operations should be appended to the file.  To do that,
 161                  * though, using this protocol, would require a getattrE()
 162                  * call for each and every write, to determine where the end
 163                  * of the file is. (There does not appear to be an append flag
 164                  * in the protocol.)  Rather than add all of that overhead of
 165                  * retrieving the current end-of-file offset prior to each
 166                  * write operation, we'll assume that most append operations
 167                  * will continuously write, so we'll just set the offset to
 168                  * the end of the file now and hope that's adequate.
 169                  *
 170                  * Note to self: If this proves inadequate, and O_APPEND
 171                  * should, in some cases, be forced for each write, add a
 172                  * field in the context options structure, for
 173                  * "strict_append_mode" which would select between the current
 174                  * behavior (if FALSE) or issuing a getattrE() prior to each
 175                  * write and forcing the write to the end of the file (if
 176                  * TRUE).  Adding that capability will likely require adding
 177                  * an "append" flag into the _SMBCFILE structure to track
 178                  * whether a file was opened in O_APPEND mode.  -- djl
 179                  */
 180                 if (flags & O_APPEND) {
 181                         if (SMBC_lseek_ctx(context, file, 0, SEEK_END) < 0) {
 182                                 (void) SMBC_close_ctx(context, file);
 183                                 errno = ENXIO;
 184                                 TALLOC_FREE(frame);
 185                                 return NULL;
 186                         }
 187                 }
 188
 189                 TALLOC_FREE(frame);
 190                 return file;
 191         }
 192
 193         /* Check if opendir needed ... */
 194
 195         if (!NT_STATUS_IS_OK(status)) {
 196                 int eno = 0;
 197
 198                 eno = SMBC_errno(context, srv->cli);
 199                 file = smbc_getFunctionOpendir(context)(context, fname);
 200                 if (!file) errno = eno;
 201                 TALLOC_FREE(frame);
 202                 return file;
 203         }
 204
 205         errno = EINVAL; /* FIXME, correct errno ? */
 206         TALLOC_FREE(frame);
 207         return NULL;
 208 }
 209
 210 /*
 211  * Routine to create a file
 212  */
 213
 214 SMBCFILE *
 215 SMBC_creat_ctx(SMBCCTX *context,
 216                const char *path,
 217                mode_t mode)
 218 {
 219         if (!context || !context->internal->initialized) {
 220                 errno = EINVAL;
 221                 return NULL;
 222         }
 223
 224         return SMBC_open_ctx(context, path,
 225                              O_WRONLY | O_CREAT | O_TRUNC, mode);
 226 }
 227
 228 /*
 229  * Routine to read() a file ...
 230  */
 231
 232 ssize_t
 233 SMBC_read_ctx(SMBCCTX *context,
 234               SMBCFILE *file,
 235               void *buf,
 236               size_t count)
 237 {
 238         size_t ret;
 239         TALLOC_CTX *frame = talloc_stackframe();
 240         NTSTATUS status;
 241
 242         /*
 243          * offset:
 244          *
 245          * Compiler bug (possibly) -- gcc (GCC) 3.3.5 (Debian 1:3.3.5-2) --
 246          * appears to pass file->offset (which is type off_t) differently than
 247          * a local variable of type off_t.  Using local variable "offset" in
 248          * the call to cli_read() instead of file->offset fixes a problem
 249          * retrieving data at an offset greater than 4GB.
 250          */
 251         off_t offset;
 252
 253         if (!context || !context->internal->initialized) {
 254                 errno = EINVAL;
 255                 TALLOC_FREE(frame);
 256                 return -1;
 257         }
 258
 259         DEBUG(4, ("smbc_read(%p, %d)\n", file, (int)count));
 260
 261         if (!file || !SMBC_dlist_contains(context->internal->files, file)) {
 262                 errno = EBADF;
 263                 TALLOC_FREE(frame);
 264                 return -1;
 265         }
 266
 267         offset = file->offset;
 268
 269         /* Check that the buffer exists ... */
 270
 271         if (buf == NULL) {
 272                 errno = EINVAL;
 273                 TALLOC_FREE(frame);
 274                 return -1;
 275         }
 276
 277         status = cli_read(file->targetcli, file->cli_fd, (char *)buf, offset,
 278                           count, &ret);
 279         if (!NT_STATUS_IS_OK(status)) {
 280                 errno = SMBC_errno(context, file->targetcli);
 281                 TALLOC_FREE(frame);
 282                 return -1;
 283         }
 284
 285         file->offset += ret;
 286
 287         DEBUG(4, ("  --> %ld\n", (unsigned long)ret));
 288
 289         TALLOC_FREE(frame);
 290         return ret;  /* Success, ret bytes of data ... */
 291 }
 292
 293 off_t
 294 SMBC_splice_ctx(SMBCCTX *context,
 295                 SMBCFILE *srcfile,
 296                 SMBCFILE *dstfile,
 297                 off_t count,
 298                 int (*splice_cb)(off_t n, void *priv),
 299                 void *priv)
 300 {
 301         off_t written = 0;
 302         TALLOC_CTX *frame = talloc_stackframe();
 303         NTSTATUS status;
 304
 305         if (!context || !context->internal->initialized) {
 306                 errno = EINVAL;
 307                 TALLOC_FREE(frame);
 308                 return -1;
 309         }
 310
 311         if (!srcfile ||
 312             !SMBC_dlist_contains(context->internal->files, srcfile))
 313         {
 314                 errno = EBADF;
 315                 TALLOC_FREE(frame);
 316                 return -1;
 317         }
 318
 319         if (!dstfile ||
 320             !SMBC_dlist_contains(context->internal->files, dstfile))
 321         {
 322                 errno = EBADF;
 323                 TALLOC_FREE(frame);
 324                 return -1;
 325         }
 326
 327         status = cli_splice(srcfile->targetcli, dstfile->targetcli,
 328                             srcfile->cli_fd, dstfile->cli_fd,
 329                             count, srcfile->offset, dstfile->offset, &written,
 330                             splice_cb, priv);
 331         if (!NT_STATUS_IS_OK(status)) {
 332                 errno = SMBC_errno(context, srcfile->targetcli);
 333                 TALLOC_FREE(frame);
 334                 return -1;
 335         }
 336
 337         srcfile->offset += written;
 338         dstfile->offset += written;
 339
 340         TALLOC_FREE(frame);
 341         return written;
 342 }
 343
 344 /*
 345  * Routine to write() a file ...
 346  */
 347
 348 ssize_t
 349 SMBC_write_ctx(SMBCCTX *context,
 350                SMBCFILE *file,
 351                const void *buf,
 352                size_t count)
 353 {
 354         off_t offset;
 355         TALLOC_CTX *frame = talloc_stackframe();
 356         NTSTATUS status;
 357
 358         /* First check all pointers before dereferencing them */
 359
 360         if (!context || !context->internal->initialized) {
 361                 errno = EINVAL;
 362                 TALLOC_FREE(frame);
 363                 return -1;
 364         }
 365
 366         if (!file || !SMBC_dlist_contains(context->internal->files, file)) {
 367                 errno = EBADF;
 368                 TALLOC_FREE(frame);
 369                 return -1;
 370         }
 371
 372         /* Check that the buffer exists ... */
 373
 374         if (buf == NULL) {
 375                 errno = EINVAL;
 376                 TALLOC_FREE(frame);
 377                 return -1;
 378         }
 379
 380         offset = file->offset; /* See "offset" comment in SMBC_read_ctx() */
 381
 382         status = cli_writeall(file->targetcli, file->cli_fd,
 383                               0, (const uint8_t *)buf, offset, count, NULL);
 384         if (!NT_STATUS_IS_OK(status)) {
 385                 errno = map_errno_from_nt_status(status);
 386                 TALLOC_FREE(frame);
 387                 return -1;
 388         }
 389
 390         file->offset += count;
 391
 392         TALLOC_FREE(frame);
 393         return count;  /* Success, 0 bytes of data ... */
 394 }
 395
 396 /*
 397  * Routine to close() a file ...
 398  */
 399
 400 int
 401 SMBC_close_ctx(SMBCCTX *context,
 402                SMBCFILE *file)
 403 {
 404         TALLOC_CTX *frame = talloc_stackframe();
 405
 406         if (!context || !context->internal->initialized) {
 407                 errno = EINVAL;
 408                 TALLOC_FREE(frame);
 409                 return -1;
 410         }
 411
 412         if (!file || !SMBC_dlist_contains(context->internal->files, file)) {
 413                 errno = EBADF;
 414                 TALLOC_FREE(frame);
 415                 return -1;
 416         }
 417
 418         /* IS a dir ... */
 419         if (!file->file) {
 420                 TALLOC_FREE(frame);
 421                 return smbc_getFunctionClosedir(context)(context, file);
 422         }
 423
 424         if (!NT_STATUS_IS_OK(cli_close(file->targetcli, file->cli_fd))) {
 425                 SMBCSRV *srv;
 426                 DEBUG(3, ("cli_close failed on %s. purging server.\n",
 427                           file->fname));
 428                 /* Deallocate slot and remove the server
 429                  * from the server cache if unused */
 430                 errno = SMBC_errno(context, file->targetcli);
 431                 srv = file->srv;
 432                 DLIST_REMOVE(context->internal->files, file);
 433                 SAFE_FREE(file->fname);
 434                 SAFE_FREE(file);
 435                 smbc_getFunctionRemoveUnusedServer(context)(context, srv);
 436                 TALLOC_FREE(frame);
 437                 return -1;
 438         }
 439
 440         DLIST_REMOVE(context->internal->files, file);
 441         SAFE_FREE(file->fname);
 442         SAFE_FREE(file);
 443         TALLOC_FREE(frame);
 444         return 0;
 445 }
 446
 447 /*
 448  * Get info from an SMB server on a file. Use a qpathinfo call first
 449  * and if that fails, use getatr, as Win95 sometimes refuses qpathinfo
 450  */
 451 bool
 452 SMBC_getatr(SMBCCTX * context,
 453             SMBCSRV *srv,
 454             const char *path,
 455             uint16_t *mode,
 456             off_t *size,
 457             struct timespec *create_time_ts,
 458             struct timespec *access_time_ts,
 459             struct timespec *write_time_ts,
 460             struct timespec *change_time_ts,
 461             SMB_INO_T *ino)
 462 {
 463         char *fixedpath = NULL;
 464         char *targetpath = NULL;
 465         struct cli_state *targetcli = NULL;
 466         time_t write_time;
 467         TALLOC_CTX *frame = talloc_stackframe();
 468         NTSTATUS status;
 469
 470         if (!context || !context->internal->initialized) {
 471                 errno = EINVAL;
 472                 TALLOC_FREE(frame);
 473                 return False;
 474         }
 475
 476         /* path fixup for . and .. */
 477         if (strequal(path, ".") || strequal(path, "..")) {
 478                 fixedpath = talloc_strdup(frame, "\\");
 479                 if (!fixedpath) {
 480                         errno = ENOMEM;
 481                         TALLOC_FREE(frame);
 482                         return False;
 483                 }
 484         } else {
 485                 fixedpath = talloc_strdup(frame, path);
 486                 if (!fixedpath) {
 487                         errno = ENOMEM;
 488                         TALLOC_FREE(frame);
 489                         return False;
 490                 }
 491                 trim_string(fixedpath, NULL, "\\..");
 492                 trim_string(fixedpath, NULL, "\\.");
 493         }
 494         DEBUG(4,("SMBC_getatr: sending qpathinfo\n"));
 495
 496         status = cli_resolve_path(frame, "", context->internal->auth_info,
 497                                   srv->cli, fixedpath,
 498                                   &targetcli, &targetpath);
 499         if (!NT_STATUS_IS_OK(status)) {
 500                 d_printf("Couldn't resolve %s\n", path);
 501                 errno = ENOENT;
 502                 TALLOC_FREE(frame);
 503                 return False;
 504         }
 505
 506         if (!srv->no_pathinfo2 &&
 507             NT_STATUS_IS_OK(cli_qpathinfo2(targetcli, targetpath,
 508                            create_time_ts,
 509                            access_time_ts,
 510                            write_time_ts,
 511                            change_time_ts,
 512                            size, mode, ino))) {
 513                 TALLOC_FREE(frame);
 514                 return True;
 515         }
 516
 517         srv->no_pathinfo2 = True;
 518
 519         if (!srv->no_pathinfo3 &&
 520             NT_STATUS_IS_OK(cli_qpathinfo3(targetcli, targetpath,
 521                            create_time_ts,
 522                            access_time_ts,
 523                            write_time_ts,
 524                            change_time_ts,
 525                            size, mode, ino))) {
 526                 TALLOC_FREE(frame);
 527                 return True;
 528         }
 529
 530         srv->no_pathinfo3 = True;
 531
 532         /* if this is NT then don't bother with the getatr */
 533         if (smb1cli_conn_capabilities(targetcli->conn) & CAP_NT_SMBS) {
 534                 goto all_failed;
 535         }
 536
 537         if (NT_STATUS_IS_OK(cli_getatr(targetcli, targetpath, mode, size, &write_time))) {
 538                 struct timespec w_time_ts;
 539
 540                 w_time_ts = convert_time_t_to_timespec(write_time);
 541                 if (write_time_ts != NULL) {
 542                         *write_time_ts = w_time_ts;
 543                 }
 544                 if (create_time_ts != NULL) {
 545                         *create_time_ts = w_time_ts;
 546                 }
 547                 if (access_time_ts != NULL) {
 548                         *access_time_ts = w_time_ts;
 549                 }
 550                 if (change_time_ts != NULL) {
 551                         *change_time_ts = w_time_ts;
 552                 }
 553                 if (ino) {
 554                         *ino = 0;
 555                 }
 556                 TALLOC_FREE(frame);
 557                 return True;
 558         }
 559
 560 all_failed:
 561         srv->no_pathinfo2 = False;
 562         srv->no_pathinfo3 = False;
 563
 564         errno = EPERM;
 565         TALLOC_FREE(frame);
 566         return False;
 567 }
 568
 569 /*
 570  * Set file info on an SMB server.  Use setpathinfo call first.  If that
 571  * fails, use setattrE..
 572  *
 573  * Access and modification time parameters are always used and must be
 574  * provided.  Create time, if zero, will be determined from the actual create
 575  * time of the file.  If non-zero, the create time will be set as well.
 576  *
 577  * "mode" (attributes) parameter may be set to -1 if it is not to be set.
 578  */
 579 bool
 580 SMBC_setatr(SMBCCTX * context, SMBCSRV *srv, char *path,
 581             time_t create_time,
 582             time_t access_time,
 583             time_t write_time,
 584             time_t change_time,
 585             uint16_t mode)
 586 {
 587         uint16_t fd;
 588         int ret;
 589         TALLOC_CTX *frame = talloc_stackframe();
 590
 591         /*
 592          * First, try setpathinfo (if qpathinfo succeeded), for it is the
 593          * modern function for "new code" to be using, and it works given a
 594          * filename rather than requiring that the file be opened to have its
 595          * attributes manipulated.
 596          */
 597         if (srv->no_pathinfo ||
 598             !NT_STATUS_IS_OK(cli_setpathinfo_basic(srv->cli, path,
 599                                                    create_time,
 600                                                    access_time,
 601                                                    write_time,
 602                                                    change_time,
 603                                                    mode))) {
 604
 605                 /*
 606                  * setpathinfo is not supported; go to plan B.
 607                  *
 608                  * cli_setatr() does not work on win98, and it also doesn't
 609                  * support setting the access time (only the modification
 610                  * time), so in all cases, we open the specified file and use
 611                  * cli_setattrE() which should work on all OS versions, and
 612                  * supports both times.
 613                  */
 614
 615                 /* Don't try {q,set}pathinfo() again, with this server */
 616                 srv->no_pathinfo = True;
 617
 618                 /* Open the file */
 619                 if (!NT_STATUS_IS_OK(cli_open(srv->cli, path, O_RDWR, DENY_NONE, &fd))) {
 620                         errno = SMBC_errno(context, srv->cli);
 621                         TALLOC_FREE(frame);
 622                         return -1;
 623                 }
 624
 625                 /* Set the new attributes */
 626                 ret = NT_STATUS_IS_OK(cli_setattrE(srv->cli, fd,
 627                                    change_time,
 628                                    access_time,
 629                                    write_time));
 630
 631                 /* Close the file */
 632                 cli_close(srv->cli, fd);
 633
 634                 /*
 635                  * Unfortunately, setattrE() doesn't have a provision for
 636                  * setting the access mode (attributes).  We'll have to try
 637                  * cli_setatr() for that, and with only this parameter, it
 638                  * seems to work on win98.
 639                  */
 640                 if (ret && mode != (uint16_t) -1) {
 641                         ret = NT_STATUS_IS_OK(cli_setatr(srv->cli, path, mode, 0));
 642                 }
 643
 644                 if (! ret) {
 645                         errno = SMBC_errno(context, srv->cli);
 646                         TALLOC_FREE(frame);
 647                         return False;
 648                 }
 649         }
 650
 651         TALLOC_FREE(frame);
 652         return True;
 653 }
 654
 655 /*
 656  * A routine to lseek() a file
 657  */
 658
 659 off_t
 660 SMBC_lseek_ctx(SMBCCTX *context,
 661                SMBCFILE *file,
 662                off_t offset,
 663                int whence)
 664 {
 665         off_t size;
 666         TALLOC_CTX *frame = talloc_stackframe();
 667
 668         if (!context || !context->internal->initialized) {
 669                 errno = EINVAL;
 670                 TALLOC_FREE(frame);
 671                 return -1;
 672         }
 673
 674         if (!file || !SMBC_dlist_contains(context->internal->files, file)) {
 675                 errno = EBADF;
 676                 TALLOC_FREE(frame);
 677                 return -1;
 678         }
 679
 680         if (!file->file) {
 681                 errno = EINVAL;
 682                 TALLOC_FREE(frame);
 683                 return -1;      /* Can't lseek a dir ... */
 684         }
 685
 686         switch (whence) {
 687         case SEEK_SET:
 688                 file->offset = offset;
 689                 break;
 690         case SEEK_CUR:
 691                 file->offset += offset;
 692                 break;
 693         case SEEK_END:
 694                 if (!NT_STATUS_IS_OK(cli_qfileinfo_basic(
 695                                              file->targetcli, file->cli_fd, NULL,
 696                                              &size, NULL, NULL, NULL, NULL,
 697                                              NULL))) {
 698                         off_t b_size = size;
 699                         if (!NT_STATUS_IS_OK(cli_getattrE(file->targetcli, file->cli_fd,
 700                                           NULL, &b_size, NULL, NULL, NULL))) {
 701                                 errno = EINVAL;
 702                                 TALLOC_FREE(frame);
 703                                 return -1;
 704                         } else
 705                                 size = b_size;
 706                 }
 707                 file->offset = size + offset;
 708                 break;
 709         default:
 710                 errno = EINVAL;
 711                 break;
 712         }
 713
 714         TALLOC_FREE(frame);
 715         return file->offset;
 716 }
 717
 718
 719 /*
 720  * Routine to truncate a file given by its file descriptor, to a specified size
 721  */
 722
 723 int
 724 SMBC_ftruncate_ctx(SMBCCTX *context,
 725                    SMBCFILE *file,
 726                    off_t length)
 727 {
 728         off_t size = length;
 729         TALLOC_CTX *frame = talloc_stackframe();
 730
 731         if (!context || !context->internal->initialized) {
 732                 errno = EINVAL;
 733                 TALLOC_FREE(frame);
 734                 return -1;
 735         }
 736
 737         if (!file || !SMBC_dlist_contains(context->internal->files, file)) {
 738                 errno = EBADF;
 739                 TALLOC_FREE(frame);
 740                 return -1;
 741         }
 742
 743         if (!file->file) {
 744                 errno = EINVAL;
 745                 TALLOC_FREE(frame);
 746                 return -1;
 747         }
 748
 749         if (!NT_STATUS_IS_OK(cli_ftruncate(file->targetcli, file->cli_fd, (uint64_t)size))) {
 750                 errno = EINVAL;
 751                 TALLOC_FREE(frame);
 752                 return -1;
 753         }
 754
 755         TALLOC_FREE(frame);
 756         return 0;
 757 }