Kernel/vfs/open.c

   1 /*
   2  * Acess2 VFS
   3  * - Open, Close and ChDir
   4  */
   5 #define DEBUG   0
   6 #include <acess.h>
   7 #include "vfs.h"
   8 #include "vfs_int.h"
   9 #include "vfs_ext.h"
  10
  11 // === CONSTANTS ===
  12 #define OPEN_MOUNT_ROOT 1
  13 #define MAX_PATH_SLASHES        256
  14 #define MAX_NESTED_LINKS        4
  15 #define MAX_PATH_LEN    255
  16
  17 // === IMPORTS ===
  18 extern tVFS_Node        gVFS_MemRoot;
  19 extern tVFS_Mount       *gVFS_RootMount;
  20 extern int      VFS_AllocHandle(int bIsUser, tVFS_Node *Node, int Mode);
  21
  22 // === PROTOTYPES ===
  23  int    VFS_int_CreateHandle( tVFS_Node *Node, int Mode );
  24
  25 // === CODE ===
  26 /**
  27  * \fn char *VFS_GetAbsPath(const char *Path)
  28  * \brief Create an absolute path from a relative one
  29  */
  30 char *VFS_GetAbsPath(const char *Path)
  31 {
  32         char    *ret;
  33          int    pathLen = strlen(Path);
  34         char    *pathComps[MAX_PATH_SLASHES];
  35         char    *tmpStr;
  36         int             iPos = 0;
  37         int             iPos2 = 0;
  38         const char      *chroot = CFGPTR(CFG_VFS_CHROOT);
  39          int    chrootLen;
  40         const char      *cwd = CFGPTR(CFG_VFS_CWD);
  41          int    cwdLen;
  42
  43         ENTER("sPath", Path);
  44
  45         // Memory File
  46         if(Path[0] == '$') {
  47                 ret = malloc(strlen(Path)+1);
  48                 if(!ret) {
  49                         Log_Warning("VFS", "VFS_GetAbsPath: malloc() returned NULL");
  50                         return NULL;
  51                 }
  52                 strcpy(ret, Path);
  53                 LEAVE('p', ret);
  54                 return ret;
  55         }
  56
  57         // - Fetch ChRoot
  58         if( chroot == NULL ) {
  59                 chroot = "";
  60                 chrootLen = 0;
  61         } else {
  62                 chrootLen = strlen(chroot);
  63         }
  64
  65         // Check if the path is already absolute
  66         if(Path[0] == '/') {
  67                 ret = malloc(chrootLen + pathLen + 1);
  68                 if(!ret) {
  69                         Log_Warning("VFS", "VFS_GetAbsPath: malloc() returned NULL");
  70                         return NULL;
  71                 }
  72                 strcpy(ret + chrootLen, Path);
  73         }
  74         else {
  75                 if(cwd == NULL) {
  76                         cwd = "/";
  77                         cwdLen = 1;
  78                 }
  79                 else {
  80                         cwdLen = strlen(cwd);
  81                 }
  82                 // Prepend the current directory
  83                 ret = malloc(chrootLen + cwdLen + 1 + pathLen + 1 );
  84                 strcpy(ret+chrootLen, cwd);
  85                 ret[cwdLen] = '/';
  86                 strcpy(ret+chrootLen+cwdLen+1, Path);
  87                 //Log("ret = '%s'", ret);
  88         }
  89
  90         // Parse Path
  91         pathComps[iPos++] = tmpStr = ret+chrootLen+1;
  92         while(*tmpStr)
  93         {
  94                 if(*tmpStr++ == '/')
  95                 {
  96                         pathComps[iPos++] = tmpStr;
  97                         if(iPos == MAX_PATH_SLASHES) {
  98                                 LOG("Path '%s' has too many elements", Path);
  99                                 free(ret);
 100                                 LEAVE('n');
 101                                 return NULL;
 102                         }
 103                 }
 104         }
 105         pathComps[iPos] = NULL;
 106
 107         // Cleanup
 108         iPos2 = iPos = 0;
 109         while(pathComps[iPos])
 110         {
 111                 tmpStr = pathComps[iPos];
 112                 // Always Increment iPos
 113                 iPos++;
 114                 // ..
 115                 if(tmpStr[0] == '.' && tmpStr[1] == '.' && (tmpStr[2] == '/' || tmpStr[2] == '\0') )
 116                 {
 117                         if(iPos2 != 0)
 118                                 iPos2 --;
 119                         continue;
 120                 }
 121                 // .
 122                 if(tmpStr[0] == '.' && (tmpStr[1] == '/' || tmpStr[1] == '\0') )
 123                 {
 124                         continue;
 125                 }
 126                 // Empty
 127                 if(tmpStr[0] == '/' || tmpStr[0] == '\0')
 128                 {
 129                         continue;
 130                 }
 131
 132                 // Set New Position
 133                 pathComps[iPos2] = tmpStr;
 134                 iPos2++;
 135         }
 136         pathComps[iPos2] = NULL;
 137
 138         // Build New Path
 139         iPos2 = chrootLen + 1;  iPos = 0;
 140         ret[0] = '/';
 141         while(pathComps[iPos])
 142         {
 143                 tmpStr = pathComps[iPos];
 144                 while(*tmpStr && *tmpStr != '/')
 145                 {
 146                         ret[iPos2++] = *tmpStr;
 147                         tmpStr++;
 148                 }
 149                 ret[iPos2++] = '/';
 150                 iPos++;
 151         }
 152         if(iPos2 > 1)
 153                 ret[iPos2-1] = 0;
 154         else
 155                 ret[iPos2] = 0;
 156
 157         // Prepend the chroot
 158         memcpy( ret, chroot, chrootLen );
 159
 160         LEAVE('s', ret);
 161 //      Log_Debug("VFS", "VFS_GetAbsPath: RETURN '%s'", ret);
 162         return ret;
 163 }
 164
 165 /**
 166  * \fn char *VFS_ParsePath(const char *Path, char **TruePath)
 167  * \brief Parses a path, resolving sysmlinks and applying permissions
 168  */
 169 tVFS_Node *VFS_ParsePath(const char *Path, char **TruePath)
 170 {
 171         tVFS_Mount      *mnt, *longestMount;
 172          int    cmp, retLength = 0;
 173          int    ofs, nextSlash;
 174          int    iNestedLinks = 0;
 175         tVFS_Node       *curNode, *tmpNode;
 176         char    *tmp;
 177         char    path_buffer[MAX_PATH_LEN+1];
 178
 179         ENTER("sPath pTruePath", Path, TruePath);
 180
 181         // Memory File
 182         if(Path[0] == '$') {
 183                 if(TruePath) {
 184                         *TruePath = malloc(strlen(Path)+1);
 185                         strcpy(*TruePath, Path);
 186                 }
 187                 curNode = gVFS_MemRoot.FindDir(&gVFS_MemRoot, Path);
 188                 LEAVE('p', curNode);
 189                 return curNode;
 190         }
 191
 192 restart_parse:
 193         // For root we always fast return
 194         if(Path[0] == '/' && Path[1] == '\0') {
 195                 if(TruePath) {
 196                         *TruePath = malloc( gVFS_RootMount->MountPointLen+1 );
 197                         strcpy(*TruePath, gVFS_RootMount->MountPoint);
 198                 }
 199                 LEAVE('p', gVFS_RootMount->RootNode);
 200                 return gVFS_RootMount->RootNode;
 201         }
 202
 203         // Check if there is anything mounted
 204         if(!gVFS_Mounts) {
 205                 Log_Error("VFS", "VFS_ParsePath - No filesystems mounted");
 206                 return NULL;
 207         }
 208
 209         // Find Mountpoint
 210         longestMount = gVFS_RootMount;
 211         for(mnt = gVFS_Mounts; mnt; mnt = mnt->Next)
 212         {
 213                 // Quick Check
 214                 if( Path[mnt->MountPointLen] != '/' && Path[mnt->MountPointLen] != '\0')
 215                         continue;
 216                 // Length Check - If the length is smaller than the longest match sofar
 217                 if(mnt->MountPointLen < longestMount->MountPointLen)    continue;
 218                 // String Compare
 219                 cmp = strcmp(Path, mnt->MountPoint);
 220
 221                 #if OPEN_MOUNT_ROOT
 222                 // Fast Break - Request Mount Root
 223                 if(cmp == 0) {
 224                         if(TruePath) {
 225                                 *TruePath = malloc( mnt->MountPointLen+1 );
 226                                 strcpy(*TruePath, mnt->MountPoint);
 227                         }
 228                         LEAVE('p', mnt->RootNode);
 229                         return mnt->RootNode;
 230                 }
 231                 #endif
 232                 // Not a match, continue
 233                 if(cmp != '/')  continue;
 234                 longestMount = mnt;
 235         }
 236
 237         // Save to shorter variable
 238         mnt = longestMount;
 239
 240         LOG("mnt = {MountPoint:\"%s\"}", mnt->MountPoint);
 241
 242         // Initialise String
 243         if(TruePath)
 244         {
 245                 // Assumes that the resultant path (here) will not be > strlen(Path) + 1
 246                 *TruePath = malloc( strlen(Path) + 1 );
 247                 strcpy(*TruePath, mnt->MountPoint);
 248                 retLength = mnt->MountPointLen;
 249         }
 250
 251         curNode = mnt->RootNode;
 252         curNode->ReferenceCount ++;
 253         // Parse Path
 254         ofs = mnt->MountPointLen+1;
 255         for(; (nextSlash = strpos(&Path[ofs], '/')) != -1; ofs += nextSlash + 1)
 256         {
 257                 char    pathEle[nextSlash+1];
 258
 259                 // Empty String
 260                 if(nextSlash == 0)      continue;
 261
 262                 memcpy(pathEle, &Path[ofs], nextSlash);
 263                 pathEle[nextSlash] = 0;
 264
 265                 // Check permissions on root of filesystem
 266                 if( !VFS_CheckACL(curNode, VFS_PERM_EXECUTE) ) {
 267                         if(curNode->Close)      curNode->Close( curNode );
 268                         if(TruePath) {
 269                                 free(*TruePath);
 270                                 *TruePath = NULL;
 271                         }
 272                         //Log("Permissions fail on '%s'", Path);
 273                         LEAVE('n');
 274                         return NULL;
 275                 }
 276
 277                 // Check if the node has a FindDir method
 278                 if( !curNode->FindDir )
 279                 {
 280                         if(curNode->Close)      curNode->Close(curNode);
 281                         if(TruePath) {
 282                                 free(*TruePath);
 283                                 *TruePath = NULL;
 284                         }
 285                         //Log("FindDir fail on '%s'", Path);
 286                         LEAVE('n');
 287                         return NULL;
 288                 }
 289                 LOG("FindDir{=%p}(%p, '%s')", curNode->FindDir, curNode, pathEle);
 290                 // Get Child Node
 291                 tmpNode = curNode->FindDir(curNode, pathEle);
 292                 LOG("tmpNode = %p", tmpNode);
 293                 if(curNode->Close) {
 294                         //LOG2("curNode->Close = %p", curNode->Close);
 295                         curNode->Close(curNode);
 296                 }
 297                 curNode = tmpNode;
 298
 299                 // Error Check
 300                 if(!curNode) {
 301                         LOG("Node '%s' not found in dir '%s'", pathEle, Path);
 302                         if(TruePath) {
 303                                 free(*TruePath);
 304                                 *TruePath = NULL;
 305                         }
 306                         //Log("Child fail on '%s' ('%s)", Path, pathEle);
 307                         LEAVE('n');
 308                         return NULL;
 309                 }
 310
 311                 // Handle Symbolic Links
 312                 if(curNode->Flags & VFS_FFLAG_SYMLINK) {
 313                         if(TruePath) {
 314                                 free(*TruePath);
 315                                 *TruePath = NULL;
 316                         }
 317                         if(!curNode->Read) {
 318                                 Log_Warning("VFS", "VFS_ParsePath - Read of symlink node %p'%s' is NULL",
 319                                         curNode, Path);
 320                                 if(curNode->Close)      curNode->Close(curNode);
 321                                 // No need to free *TruePath, it should already be NULL
 322                                 LEAVE('n');
 323                                 return NULL;
 324                         }
 325
 326                         if(iNestedLinks > MAX_NESTED_LINKS) {
 327                                 if(curNode->Close)      curNode->Close(curNode);
 328                                 LEAVE('n');
 329                                 return NULL;
 330                         }
 331
 332                         // Parse Symlink Path
 333                         // - Just update the path variable and restart the function
 334                         // > Count nested symlinks and limit to some value (counteracts loops)
 335                         {
 336                                  int    remlen = strlen(Path) - (ofs + nextSlash);
 337                                 if( curNode->Size + remlen > MAX_PATH_LEN ) {
 338                                         if(curNode->Close)      curNode->Close(curNode);
 339                                         Log_Warning("VFS", "VFS_ParsePath - Symlinked path too long");
 340                                         LEAVE('n');
 341                                         return NULL;
 342                                 }
 343                                 curNode->Read( curNode, 0, curNode->Size, path_buffer );
 344                                 path_buffer[ curNode->Size ] = '\0';
 345                                 strcat(path_buffer, Path + ofs+nextSlash);
 346
 347                                 Path = path_buffer;
 348 //                              Log_Debug("VFS", "VFS_ParsePath: Symlink translated to '%s'", Path);
 349                                 iNestedLinks ++;
 350                         }
 351
 352                         // EVIL: Goto :)
 353                         goto restart_parse;
 354                 }
 355
 356                 // Handle Non-Directories
 357                 if( !(curNode->Flags & VFS_FFLAG_DIRECTORY) )
 358                 {
 359                         Log_Warning("VFS", "VFS_ParsePath - Path segment is not a directory");
 360                         if(TruePath)    free(*TruePath);
 361                         LEAVE('n');
 362                         return NULL;
 363                 }
 364
 365                 // Check if path needs extending
 366                 if(!TruePath)   continue;
 367
 368                 // Increase buffer space
 369                 tmp = realloc( *TruePath, retLength + strlen(pathEle) + 1 + 1 );
 370                 // Check if allocation succeeded
 371                 if(!tmp) {
 372                         Log_Warning("VFS", "VFS_ParsePath - Unable to reallocate true path buffer");
 373                         free(*TruePath);
 374                         *TruePath = NULL;
 375                         if(curNode->Close)      curNode->Close(curNode);
 376                         LEAVE('n');
 377                         return NULL;
 378                 }
 379                 *TruePath = tmp;
 380                 // Append to path
 381                 (*TruePath)[retLength] = '/';
 382                 strcpy(*TruePath+retLength+1, pathEle);
 383
 384                 LOG("*TruePath = '%s'", *TruePath);
 385
 386                 // - Extend Path
 387                 retLength += nextSlash + 1;
 388         }
 389
 390         if( !curNode->FindDir ) {
 391                 if(curNode->Close)      curNode->Close(curNode);
 392                 if(TruePath) {
 393                         free(*TruePath);
 394                         *TruePath = NULL;
 395                 }
 396                 Log_Warning("VFS", "VFS_ParsePath - FindDir doesn't exist for element of '%s'", Path);
 397                 LEAVE('n');
 398                 return NULL;
 399         }
 400
 401         // Get last node
 402         LOG("VFS_ParsePath: FindDir(%p, '%s')", curNode, &Path[ofs]);
 403         tmpNode = curNode->FindDir(curNode, &Path[ofs]);
 404         LOG("tmpNode = %p", tmpNode);
 405         if(curNode->Close)      curNode->Close(curNode);
 406         // Check if file was found
 407         if(!tmpNode) {
 408                 LOG("Node '%s' not found in dir '%s'", &Path[ofs], Path);
 409                 //Log("Child fail '%s' ('%s')", Path, &Path[ofs]);
 410                 if(TruePath)    free(*TruePath);
 411                 if(curNode->Close)      curNode->Close(curNode);
 412                 LEAVE('n');
 413                 return NULL;
 414         }
 415
 416         if(TruePath)
 417         {
 418                 // Increase buffer space
 419                 tmp = realloc(*TruePath, retLength + strlen(&Path[ofs]) + 1 + 1);
 420                 // Check if allocation succeeded
 421                 if(!tmp) {
 422                         Log_Warning("VFS", "VFS_ParsePath -  Unable to reallocate true path buffer");
 423                         free(*TruePath);
 424                         if(tmpNode->Close)      tmpNode->Close(curNode);
 425                         LEAVE('n');
 426                         return NULL;
 427                 }
 428                 *TruePath = tmp;
 429                 // Append to path
 430                 (*TruePath)[retLength] = '/';
 431                 strcpy(*TruePath + retLength + 1, &Path[ofs]);
 432                 // - Extend Path
 433                 //retLength += strlen(tmpNode->Name) + 1;
 434         }
 435
 436         LEAVE('p', tmpNode);
 437         return tmpNode;
 438 }
 439
 440 /**
 441  * \brief Create and return a handle number for the given node and mode
 442  */
 443 int VFS_int_CreateHandle( tVFS_Node *Node, int Mode )
 444 {
 445          int    i;
 446         i = 0;
 447         i |= (Mode & VFS_OPENFLAG_EXEC) ? VFS_PERM_EXECUTE : 0;
 448         i |= (Mode & VFS_OPENFLAG_READ) ? VFS_PERM_READ : 0;
 449         i |= (Mode & VFS_OPENFLAG_WRITE) ? VFS_PERM_WRITE : 0;
 450
 451         LOG("i = 0b%b", i);
 452
 453         // Permissions Check
 454         if( !VFS_CheckACL(Node, i) ) {
 455                 if(Node->Close) Node->Close( Node );
 456                 Log_Log("VFS", "VFS_int_CreateHandle: Permissions Failed");
 457                 errno = EACCES;
 458                 LEAVE_RET('i', -1);
 459         }
 460
 461         i = VFS_AllocHandle( !!(Mode & VFS_OPENFLAG_USER), Node, Mode );
 462         if( i < 0 ) {
 463                 Log_Notice("VFS", "VFS_int_CreateHandle: Out of handles");
 464                 errno = ENFILE;
 465                 LEAVE_RET('i', -1);
 466         }
 467
 468         LEAVE_RET('x', i);
 469 }
 470
 471 /**
 472  * \fn int VFS_Open(const char *Path, Uint Mode)
 473  * \brief Open a file
 474  */
 475 int VFS_Open(const char *Path, Uint Mode)
 476 {
 477         tVFS_Node       *node;
 478         char    *absPath;
 479
 480         ENTER("sPath xMode", Path, Mode);
 481
 482         // Get absolute path
 483         absPath = VFS_GetAbsPath(Path);
 484         if(absPath == NULL) {
 485                 Log_Warning("VFS", "VFS_Open: Path expansion failed '%s'", Path);
 486                 LEAVE_RET('i', -1);
 487         }
 488         LOG("absPath = \"%s\"", absPath);
 489         // Parse path and get mount point
 490         node = VFS_ParsePath(absPath, NULL);
 491         // Free generated path
 492         free(absPath);
 493
 494         if(!node) {
 495                 LOG("Cannot find node");
 496                 errno = ENOENT;
 497                 LEAVE_RET('i', -1);
 498         }
 499
 500         // Check for symlinks
 501         if( !(Mode & VFS_OPENFLAG_NOLINK) && (node->Flags & VFS_FFLAG_SYMLINK) )
 502         {
 503                 char    tmppath[node->Size+1];
 504                 if( node->Size > MAX_PATH_LEN ) {
 505                         Log_Warning("VFS", "VFS_Open - Symlink is too long (%i)", node->Size);
 506                         LEAVE_RET('i', -1);
 507                 }
 508                 if( !node->Read ) {
 509                         Log_Warning("VFS", "VFS_Open - No read method on symlink");
 510                         LEAVE_RET('i', -1);
 511                 }
 512                 // Read symlink's path
 513                 node->Read( node, 0, node->Size, tmppath );
 514                 tmppath[ node->Size ] = '\0';
 515                 if(node->Close) node->Close( node );
 516                 // Open the target
 517                 node = VFS_ParsePath(tmppath, NULL);
 518                 if(!node) {
 519                         LOG("Cannot find symlink target node (%s)", tmppath);
 520                         errno = ENOENT;
 521                         LEAVE_RET('i', -1);
 522                 }
 523         }
 524
 525         LEAVE_RET('x', VFS_int_CreateHandle(node, Mode));
 526 }
 527
 528
 529 /**
 530  * \brief Open a file from an open directory
 531  */
 532 int VFS_OpenChild(int FD, const char *Name, Uint Mode)
 533 {
 534         tVFS_Handle     *h;
 535         tVFS_Node       *node;
 536
 537         ENTER("xFD sName xMode", FD, Name, Mode);
 538
 539         // Get handle
 540         h = VFS_GetHandle(FD);
 541         if(h == NULL) {
 542                 Log_Warning("VFS", "VFS_OpenChild - Invalid file handle 0x%x", FD);
 543                 errno = EINVAL;
 544                 LEAVE_RET('i', -1);
 545         }
 546
 547         // Check for directory
 548         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 549                 Log_Warning("VFS", "VFS_OpenChild - Passed handle is not a directory", FD);
 550                 errno = ENOTDIR;
 551                 LEAVE_RET('i', -1);
 552         }
 553
 554         // Find Child
 555         node = h->Node->FindDir(h->Node, Name);
 556         if(!node) {
 557                 errno = ENOENT;
 558                 LEAVE_RET('i', -1);
 559         }
 560
 561         LEAVE_RET('x', VFS_int_CreateHandle(node, Mode));
 562 }
 563
 564 int VFS_OpenInode(Uint32 Mount, Uint64 Inode, int Mode)
 565 {
 566         tVFS_Mount      *mnt;
 567         tVFS_Node       *node;
 568
 569         ENTER("iMount iInode xMode", Mount, Inode, Mode);
 570
 571         // Get mount point
 572         mnt = VFS_GetMountByIdent(Mount);
 573         if( !mnt ) {
 574                 LOG("Mount point ident invalid");
 575                 errno = ENOENT;
 576                 LEAVE_RET('i', -1);
 577         }
 578
 579         // Does the filesystem support this?
 580         if( !mnt->Filesystem->GetNodeFromINode ) {
 581                 errno = ENOENT;
 582                 LEAVE_RET('i', -1);
 583         }
 584
 585         // Get node
 586         node = mnt->Filesystem->GetNodeFromINode(mnt->RootNode, Inode);
 587         if( !node ) {
 588                 errno = ENOENT;
 589                 LEAVE_RET('i', -1);
 590         }
 591
 592         LEAVE_RET('x', VFS_int_CreateHandle(node, Mode));
 593 }
 594
 595 /**
 596  * \fn void VFS_Close(int FD)
 597  * \brief Closes an open file handle
 598  */
 599 void VFS_Close(int FD)
 600 {
 601         tVFS_Handle     *h;
 602
 603         // Get handle
 604         h = VFS_GetHandle(FD);
 605         if(h == NULL) {
 606                 Log_Warning("VFS", "Invalid file handle passed to VFS_Close, 0x%x", FD);
 607                 return;
 608         }
 609
 610         #if VALIDATE_VFS_FUNCTIPONS
 611         if(h->Node->Close && !MM_GetPhysAddr(h->Node->Close)) {
 612                 Log_Warning("VFS", "Node %p's ->Close method is invalid (%p)",
 613                         h->Node, h->Node->Close);
 614                 return ;
 615         }
 616         #endif
 617
 618         if(h->Node->Close)
 619                 h->Node->Close( h->Node );
 620
 621         h->Node = NULL;
 622 }
 623
 624 /**
 625  * \brief Change current working directory
 626  */
 627 int VFS_ChDir(const char *Dest)
 628 {
 629         char    *buf;
 630          int    fd;
 631         tVFS_Handle     *h;
 632
 633         // Create Absolute
 634         buf = VFS_GetAbsPath(Dest);
 635         if(buf == NULL) {
 636                 Log("VFS_ChDir: Path expansion failed");
 637                 return -1;
 638         }
 639
 640         // Check if path exists
 641         fd = VFS_Open(buf, VFS_OPENFLAG_EXEC);
 642         if(fd == -1) {
 643                 Log("VFS_ChDir: Path is invalid");
 644                 return -1;
 645         }
 646
 647         // Get node so we can check for directory
 648         h = VFS_GetHandle(fd);
 649         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 650                 Log("VFS_ChDir: Path is not a directory");
 651                 VFS_Close(fd);
 652                 return -1;
 653         }
 654
 655         // Close file
 656         VFS_Close(fd);
 657
 658         // Free old working directory
 659         if( CFGPTR(CFG_VFS_CWD) )
 660                 free( CFGPTR(CFG_VFS_CWD) );
 661         // Set new
 662         CFGPTR(CFG_VFS_CWD) = buf;
 663
 664         Log("Updated CWD to '%s'", buf);
 665
 666         return 1;
 667 }
 668
 669 /**
 670  * \fn int VFS_ChRoot(char *New)
 671  * \brief Change current root directory
 672  */
 673 int VFS_ChRoot(const char *New)
 674 {
 675         char    *buf;
 676          int    fd;
 677         tVFS_Handle     *h;
 678
 679         if(New[0] == '/' && New[1] == '\0')
 680                 return 1;       // What a useless thing to ask!
 681
 682         // Create Absolute
 683         buf = VFS_GetAbsPath(New);
 684         if(buf == NULL) {
 685                 LOG("Path expansion failed");
 686                 return -1;
 687         }
 688
 689         // Check if path exists
 690         fd = VFS_Open(buf, VFS_OPENFLAG_EXEC);
 691         if(fd == -1) {
 692                 LOG("Path is invalid");
 693                 return -1;
 694         }
 695
 696         // Get node so we can check for directory
 697         h = VFS_GetHandle(fd);
 698         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 699                 LOG("Path is not a directory");
 700                 VFS_Close(fd);
 701                 return -1;
 702         }
 703
 704         // Close file
 705         VFS_Close(fd);
 706
 707         // Free old working directory
 708         if( CFGPTR(CFG_VFS_CHROOT) )
 709                 free( CFGPTR(CFG_VFS_CHROOT) );
 710         // Set new
 711         CFGPTR(CFG_VFS_CHROOT) = buf;
 712
 713         LOG("Updated Root to '%s'", buf);
 714
 715         return 1;
 716 }
 717
 718 // === EXPORTS ===
 719 EXPORT(VFS_Open);
 720 EXPORT(VFS_Close);