source/smbd/vfs-wrap.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    Wrap disk only vfs functions to sidestep dodgy compilers.
   5    Copyright (C) Tim Potter 1998
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 /* Check for NULL pointer parameters in vfswrap_* functions */
  25
  26 #define VFS_CHECK_NULL
  27
  28 /* We don't want to have NULL function pointers lying around.  Someone
  29    is sure to try and execute them.  These stubs are used to prevent
  30    this possibility. */
  31
  32 int vfswrap_dummy_connect(connection_struct *conn, char *service, char *user)
  33 {
  34     return 0;    /* Return >= 0 for success */
  35 }
  36
  37 void vfswrap_dummy_disconnect(connection_struct *conn)
  38 {
  39 }
  40
  41 /* Disk operations */
  42
  43 SMB_BIG_UINT vfswrap_disk_free(connection_struct *conn, char *path, BOOL small_query, SMB_BIG_UINT *bsize,
  44                                SMB_BIG_UINT *dfree, SMB_BIG_UINT *dsize)
  45 {
  46     SMB_BIG_UINT result;
  47
  48 #ifdef VFS_CHECK_NULL
  49     if ((path == NULL) || (bsize == NULL) || (dfree == NULL) ||
  50         (dsize == NULL)) {
  51
  52         smb_panic("NULL pointer passed to vfswrap_disk_free() function\n");
  53     }
  54 #endif
  55
  56     result = sys_disk_free(path, small_query, bsize, dfree, dsize);
  57     return result;
  58 }
  59
  60 /* Directory operations */
  61
  62 DIR *vfswrap_opendir(connection_struct *conn, char *fname)
  63 {
  64     DIR *result;
  65
  66     START_PROFILE(syscall_opendir);
  67
  68 #ifdef VFS_CHECK_NULL
  69     if (fname == NULL) {
  70         smb_panic("NULL pointer passed to vfswrap_opendir()\n");
  71     }
  72 #endif
  73
  74     result = opendir(fname);
  75     END_PROFILE(syscall_opendir);
  76     return result;
  77 }
  78
  79 struct dirent *vfswrap_readdir(connection_struct *conn, DIR *dirp)
  80 {
  81     struct dirent *result;
  82
  83     START_PROFILE(syscall_readdir);
  84
  85 #ifdef VFS_CHECK_NULL
  86     if (dirp == NULL) {
  87         smb_panic("NULL pointer passed to vfswrap_readdir()\n");
  88     }
  89 #endif
  90
  91     result = readdir(dirp);
  92     END_PROFILE(syscall_readdir);
  93     return result;
  94 }
  95
  96 int vfswrap_mkdir(connection_struct *conn, char *path, mode_t mode)
  97 {
  98     int result;
  99
 100     START_PROFILE(syscall_mkdir);
 101
 102 #ifdef VFS_CHECK_NULL
 103     if (path == NULL) {
 104         smb_panic("NULL pointer passed to vfswrap_mkdir()\n");
 105     }
 106 #endif
 107
 108     result = mkdir(path, mode);
 109
 110         if (result == 0) {
 111                 /*
 112                  * We need to do this as the default behavior of POSIX ACLs
 113                  * is to set the mask to be the requested group permission
 114                  * bits, not the group permission bits to be the requested
 115                  * group permission bits. This is not what we want, as it will
 116                  * mess up any inherited ACL bits that were set. JRA.
 117                  */
 118                 int saved_errno = errno; /* We may get ENOSYS */
 119                 if (conn->vfs_ops.chmod_acl != NULL) {
 120                         if ((conn->vfs_ops.chmod_acl(conn, path, mode) == -1) && (errno == ENOSYS))
 121                                 errno = saved_errno;
 122                 }
 123         }
 124
 125     END_PROFILE(syscall_mkdir);
 126     return result;
 127 }
 128
 129 int vfswrap_rmdir(connection_struct *conn, char *path)
 130 {
 131     int result;
 132
 133     START_PROFILE(syscall_rmdir);
 134
 135 #ifdef VFS_CHECK_NULL
 136     if (path == NULL) {
 137         smb_panic("NULL pointer passed to vfswrap_rmdir()\n");
 138     }
 139 #endif
 140
 141     result = rmdir(path);
 142     END_PROFILE(syscall_rmdir);
 143     return result;
 144 }
 145
 146 int vfswrap_closedir(connection_struct *conn, DIR *dirp)
 147 {
 148     int result;
 149
 150     START_PROFILE(syscall_closedir);
 151
 152 #ifdef VFS_CHECK_NULL
 153     if (dirp == NULL) {
 154         smb_panic("NULL pointer passed to vfswrap_closedir()\n");
 155     }
 156 #endif
 157
 158     result = closedir(dirp);
 159     END_PROFILE(syscall_closedir);
 160     return result;
 161 }
 162
 163 /* File operations */
 164
 165 int vfswrap_open(connection_struct *conn, char *fname, int flags, mode_t mode)
 166 {
 167     int result;
 168
 169     START_PROFILE(syscall_open);
 170
 171 #ifdef VFS_CHECK_NULL
 172     if (fname == NULL) {
 173         smb_panic("NULL pointer passed to vfswrap_open()\n");
 174     }
 175 #endif
 176
 177     result = sys_open(fname, flags, mode);
 178     END_PROFILE(syscall_open);
 179     return result;
 180 }
 181
 182 int vfswrap_close(files_struct *fsp, int fd)
 183 {
 184     int result;
 185
 186     START_PROFILE(syscall_close);
 187
 188     result = close(fd);
 189     END_PROFILE(syscall_close);
 190     return result;
 191 }
 192
 193 ssize_t vfswrap_read(files_struct *fsp, int fd, char *data, size_t n)
 194 {
 195     ssize_t result;
 196
 197     START_PROFILE_BYTES(syscall_read, n);
 198
 199 #ifdef VFS_CHECK_NULL
 200     if (data == NULL) {
 201         smb_panic("NULL pointer passed to vfswrap_read()\n");
 202     }
 203 #endif
 204
 205     result = read(fd, data, n);
 206     END_PROFILE(syscall_read);
 207     return result;
 208 }
 209
 210 ssize_t vfswrap_write(files_struct *fsp, int fd, char *data, size_t n)
 211 {
 212     ssize_t result;
 213
 214     START_PROFILE_BYTES(syscall_write, n);
 215
 216 #ifdef VFS_CHECK_NULL
 217     if (data == NULL) {
 218         smb_panic("NULL pointer passed to vfswrap_write()\n");
 219     }
 220 #endif
 221
 222     result = write(fd, data, n);
 223     END_PROFILE(syscall_write);
 224     return result;
 225 }
 226
 227 SMB_OFF_T vfswrap_lseek(files_struct *fsp, int filedes, SMB_OFF_T offset, int whence)
 228 {
 229     SMB_OFF_T result;
 230
 231     START_PROFILE(syscall_lseek);
 232
 233     result = sys_lseek(filedes, offset, whence);
 234     END_PROFILE(syscall_lseek);
 235     return result;
 236 }
 237
 238 int vfswrap_rename(connection_struct *conn, char *old, char *new)
 239 {
 240     int result;
 241
 242     START_PROFILE(syscall_rename);
 243
 244 #ifdef VFS_CHECK_NULL
 245     if ((old == NULL) || (new == NULL)) {
 246         smb_panic("NULL pointer passed to vfswrap_rename()\n");
 247     }
 248 #endif
 249
 250     result = rename(old, new);
 251     END_PROFILE(syscall_rename);
 252     return result;
 253 }
 254
 255 int vfswrap_fsync(files_struct *fsp, int fd)
 256 {
 257 #ifdef HAVE_FSYNC
 258     int result;
 259
 260     START_PROFILE(syscall_fsync);
 261
 262     result = fsync(fd);
 263     END_PROFILE(syscall_fsync);
 264     return result;
 265 #else
 266         return 0;
 267 #endif
 268 }
 269
 270 int vfswrap_stat(connection_struct *conn, char *fname, SMB_STRUCT_STAT *sbuf)
 271 {
 272     int result;
 273
 274     START_PROFILE(syscall_stat);
 275
 276 #ifdef VFS_CHECK_NULL
 277     if ((fname == NULL) || (sbuf == NULL)) {
 278         smb_panic("NULL pointer passed to vfswrap_stat()\n");
 279     }
 280 #endif
 281
 282     result = sys_stat(fname, sbuf);
 283     END_PROFILE(syscall_stat);
 284     return result;
 285 }
 286
 287 int vfswrap_fstat(files_struct *fsp, int fd, SMB_STRUCT_STAT *sbuf)
 288 {
 289     int result;
 290
 291     START_PROFILE(syscall_fstat);
 292
 293 #ifdef VFS_CHECK_NULL
 294     if (sbuf == NULL) {
 295         smb_panic("NULL pointer passed to vfswrap_fstat()\n");
 296     }
 297 #endif
 298
 299     result = sys_fstat(fd, sbuf);
 300     END_PROFILE(syscall_fstat);
 301     return result;
 302 }
 303
 304 int vfswrap_lstat(connection_struct *conn, char *path, SMB_STRUCT_STAT *sbuf)
 305 {
 306     int result;
 307
 308     START_PROFILE(syscall_lstat);
 309
 310 #ifdef VFS_CHECK_NULL
 311     if ((path == NULL) || (sbuf == NULL)) {
 312         smb_panic("NULL pointer passed to vfswrap_lstat()\n");
 313     }
 314 #endif
 315
 316     result = sys_lstat(path, sbuf);
 317     END_PROFILE(syscall_lstat);
 318     return result;
 319 }
 320
 321 int vfswrap_unlink(connection_struct *conn, char *path)
 322 {
 323     int result;
 324
 325     START_PROFILE(syscall_unlink);
 326
 327 #ifdef VFS_CHECK_NULL
 328     if (path == NULL) {
 329         smb_panic("NULL pointer passed to vfswrap_unlink()\n");
 330     }
 331 #endif
 332
 333     result = unlink(path);
 334     END_PROFILE(syscall_unlink);
 335     return result;
 336 }
 337
 338 int vfswrap_chmod(connection_struct *conn, char *path, mode_t mode)
 339 {
 340     int result;
 341
 342     START_PROFILE(syscall_chmod);
 343
 344 #ifdef VFS_CHECK_NULL
 345     if (path == NULL) {
 346         smb_panic("NULL pointer passed to vfswrap_chmod()\n");
 347     }
 348 #endif
 349
 350         /*
 351          * We need to do this due to the fact that the default POSIX ACL
 352          * chmod modifies the ACL *mask* for the group owner, not the
 353          * group owner bits directly. JRA.
 354          */
 355
 356
 357         if (conn->vfs_ops.chmod_acl != NULL) {
 358                 int saved_errno = errno; /* We might get ENOSYS */
 359                 if ((result = conn->vfs_ops.chmod_acl(conn, path, mode)) == 0) {
 360                         END_PROFILE(syscall_chmod);
 361                         return result;
 362                 }
 363                 /* Error - return the old errno. */
 364                 errno = saved_errno;
 365         }
 366
 367     result = chmod(path, mode);
 368     END_PROFILE(syscall_chmod);
 369     return result;
 370 }
 371
 372 int vfswrap_fchmod(files_struct *fsp, int fd, mode_t mode)
 373 {
 374     int result;
 375         struct vfs_ops *vfs_ops = &fsp->conn->vfs_ops;
 376
 377     START_PROFILE(syscall_fchmod);
 378
 379         /*
 380          * We need to do this due to the fact that the default POSIX ACL
 381          * chmod modifies the ACL *mask* for the group owner, not the
 382          * group owner bits directly. JRA.
 383          */
 384
 385         if (vfs_ops->fchmod_acl != NULL) {
 386                 int saved_errno = errno; /* We might get ENOSYS */
 387                 if ((result = vfs_ops->fchmod_acl(fsp, fd, mode)) == 0) {
 388                         END_PROFILE(syscall_chmod);
 389                         return result;
 390                 }
 391                 /* Error - return the old errno. */
 392                 errno = saved_errno;
 393         }
 394
 395     result = fchmod(fd, mode);
 396     END_PROFILE(syscall_fchmod);
 397     return result;
 398 }
 399
 400 int vfswrap_chown(connection_struct *conn, char *path, uid_t uid, gid_t gid)
 401 {
 402     int result;
 403
 404     START_PROFILE(syscall_chown);
 405
 406 #ifdef VFS_CHECK_NULL
 407     if (path == NULL) {
 408         smb_panic("NULL pointer passed to vfswrap_chown()\n");
 409     }
 410 #endif
 411
 412     result = sys_chown(path, uid, gid);
 413     END_PROFILE(syscall_chown);
 414     return result;
 415 }
 416
 417 int vfswrap_fchown(files_struct *fsp, int fd, uid_t uid, gid_t gid)
 418 {
 419     int result;
 420
 421     START_PROFILE(syscall_fchown);
 422
 423     result = fchown(fd, uid, gid);
 424     END_PROFILE(syscall_fchown);
 425     return result;
 426 }
 427
 428 int vfswrap_chdir(connection_struct *conn, char *path)
 429 {
 430     int result;
 431
 432     START_PROFILE(syscall_chdir);
 433
 434 #ifdef VFS_CHECK_NULL
 435     if (path == NULL) {
 436         smb_panic("NULL pointer passed to vfswrap_chdir()\n");
 437     }
 438 #endif
 439
 440     result = chdir(path);
 441     END_PROFILE(syscall_chdir);
 442     return result;
 443 }
 444
 445 char *vfswrap_getwd(connection_struct *conn, char *path)
 446 {
 447     char *result;
 448
 449     START_PROFILE(syscall_getwd);
 450
 451 #ifdef VFS_CHECK_NULL
 452     if (path == NULL) {
 453         smb_panic("NULL pointer passed to vfswrap_getwd()\n");
 454     }
 455 #endif
 456
 457     result = sys_getwd(path);
 458     END_PROFILE(syscall_getwd);
 459     return result;
 460 }
 461
 462 int vfswrap_utime(connection_struct *conn, char *path, struct utimbuf *times)
 463 {
 464     int result;
 465
 466     START_PROFILE(syscall_utime);
 467
 468 #ifdef VFS_CHECK_NULL
 469     if ((path == NULL) || (times == NULL)) {
 470         smb_panic("NULL pointer passed to vfswrap_utime()\n");
 471     }
 472 #endif
 473
 474     result = utime(path, times);
 475     END_PROFILE(syscall_utime);
 476     return result;
 477 }
 478
 479 int vfswrap_ftruncate(files_struct *fsp, int fd, SMB_OFF_T len)
 480 {
 481         int result = -1;
 482     START_PROFILE(syscall_ftruncate);
 483
 484 #ifdef HAVE_FTRUNCATE_EXTEND
 485         result = sys_ftruncate(fd, len);
 486     END_PROFILE(syscall_ftruncate);
 487     return result;
 488 #else
 489
 490         /* According to W. R. Stevens advanced UNIX prog. Pure 4.3 BSD cannot
 491                 extend a file with ftruncate. Provide alternate implementation
 492                 for this */
 493
 494         struct vfs_ops *vfs_ops = &fsp->conn->vfs_ops;
 495         SMB_STRUCT_STAT st;
 496         char c = 0;
 497         SMB_OFF_T currpos;
 498
 499         currpos = vfs_ops->lseek(fsp, (SMB_OFF_T)0, SEEK_CUR);
 500         if(currpos == -1) {
 501                 goto done;
 502         }
 503
 504         /* Do an fstat to see if the file is longer than
 505                 the requested size (call ftruncate),
 506                 or shorter, in which case seek to len - 1 and write 1
 507                 byte of zero */
 508         if(vfs_ops->fstat(fsp, &st)<0) {
 509                 goto done;
 510         }
 511
 512 #ifdef S_ISFIFO
 513         if (S_ISFIFO(st.st_mode)) {
 514                 result = 0;
 515                 goto done;
 516         }
 517 #endif
 518
 519         if(st.st_size == len) {
 520                 result = 0;
 521                 goto done;
 522         }
 523
 524         if(st.st_size > len) {
 525                 /* Yes this is *deliberately* sys_ftruncate ! JRA */
 526                 result = sys_ftruncate(fd, len);
 527                 goto done;
 528         }
 529
 530         if(vfs_ops->lseek(fsp, len-1, SEEK_SET) != len -1) {
 531                 goto done;
 532         }
 533
 534         if(vfs_ops->write(fsp, &c, 1)!=1) {
 535                 goto done;
 536         }
 537
 538         /* Seek to where we were */
 539         if(vfs_ops->lseek(fsp, currpos, SEEK_SET) != currpos) {
 540                 goto done;
 541         }
 542   done:
 543
 544     END_PROFILE(syscall_ftruncate);
 545     return result;
 546 #endif
 547
 548 }
 549
 550 BOOL vfswrap_lock(files_struct *fsp, int fd, int op, SMB_OFF_T offset, SMB_OFF_T count, int type)
 551 {
 552     BOOL result;
 553
 554     START_PROFILE(syscall_fcntl_lock);
 555
 556     result =  fcntl_lock(fd, op, offset, count,type);
 557     END_PROFILE(syscall_fcntl_lock);
 558     return result;
 559 }
 560
 561 size_t vfswrap_fget_nt_acl(files_struct *fsp, int fd, SEC_DESC **ppdesc)
 562 {
 563         return get_nt_acl(fsp, ppdesc);
 564 }
 565
 566 size_t vfswrap_get_nt_acl(files_struct *fsp, char *name, SEC_DESC **ppdesc)
 567 {
 568         return get_nt_acl(fsp, ppdesc);
 569 }
 570
 571 BOOL vfswrap_fset_nt_acl(files_struct *fsp, int fd, uint32 security_info_sent, SEC_DESC *psd)
 572 {
 573         return set_nt_acl(fsp, security_info_sent, psd);
 574 }
 575
 576 BOOL vfswrap_set_nt_acl(files_struct *fsp, char *name, uint32 security_info_sent, SEC_DESC *psd)
 577 {
 578         return set_nt_acl(fsp, security_info_sent, psd);
 579 }
 580
 581 int vfswrap_chmod_acl(connection_struct *conn, char *name, mode_t mode)
 582 {
 583         return chmod_acl(name, mode);
 584 }
 585
 586 int vfswrap_fchmod_acl(files_struct *fsp, int fd, mode_t mode)
 587 {
 588         return fchmod_acl(fd, mode);
 589 }