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, tVFS_Mount *Mount, 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, tVFS_Mount **MountPoint)
 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                 if(MountPoint) {
 189                         *MountPoint = NULL;
 190                 }
 191                 LEAVE('p', curNode);
 192                 return curNode;
 193         }
 194
 195 restart_parse:
 196         // For root we always fast return
 197         if(Path[0] == '/' && Path[1] == '\0') {
 198                 if(TruePath) {
 199                         *TruePath = malloc( gVFS_RootMount->MountPointLen+1 );
 200                         strcpy(*TruePath, gVFS_RootMount->MountPoint);
 201                 }
 202                 LEAVE('p', gVFS_RootMount->RootNode);
 203                 return gVFS_RootMount->RootNode;
 204         }
 205
 206         // Check if there is anything mounted
 207         if(!gVFS_Mounts) {
 208                 Log_Error("VFS", "VFS_ParsePath - No filesystems mounted");
 209                 return NULL;
 210         }
 211
 212         // Find Mountpoint
 213         longestMount = gVFS_RootMount;
 214         for(mnt = gVFS_Mounts; mnt; mnt = mnt->Next)
 215         {
 216                 // Quick Check
 217                 if( Path[mnt->MountPointLen] != '/' && Path[mnt->MountPointLen] != '\0')
 218                         continue;
 219                 // Length Check - If the length is smaller than the longest match sofar
 220                 if(mnt->MountPointLen < longestMount->MountPointLen)    continue;
 221                 // String Compare
 222                 cmp = strcmp(Path, mnt->MountPoint);
 223
 224                 #if OPEN_MOUNT_ROOT
 225                 // Fast Break - Request Mount Root
 226                 if(cmp == 0) {
 227                         if(TruePath) {
 228                                 *TruePath = malloc( mnt->MountPointLen+1 );
 229                                 strcpy(*TruePath, mnt->MountPoint);
 230                         }
 231                         if(MountPoint)
 232                                 *MountPoint = mnt;
 233                         LEAVE('p', mnt->RootNode);
 234                         return mnt->RootNode;
 235                 }
 236                 #endif
 237                 // Not a match, continue
 238                 if(cmp != '/')  continue;
 239                 longestMount = mnt;
 240         }
 241
 242         // Save to shorter variable
 243         mnt = longestMount;
 244
 245         LOG("mnt = {MountPoint:\"%s\"}", mnt->MountPoint);
 246
 247         // Initialise String
 248         if(TruePath)
 249         {
 250                 // Assumes that the resultant path (here) will not be > strlen(Path) + 1
 251                 *TruePath = malloc( strlen(Path) + 1 );
 252                 strcpy(*TruePath, mnt->MountPoint);
 253                 retLength = mnt->MountPointLen;
 254         }
 255
 256         curNode = mnt->RootNode;
 257         curNode->ReferenceCount ++;
 258         // Parse Path
 259         ofs = mnt->MountPointLen+1;
 260         for(; (nextSlash = strpos(&Path[ofs], '/')) != -1; ofs += nextSlash + 1)
 261         {
 262                 char    pathEle[nextSlash+1];
 263
 264                 // Empty String
 265                 if(nextSlash == 0)      continue;
 266
 267                 memcpy(pathEle, &Path[ofs], nextSlash);
 268                 pathEle[nextSlash] = 0;
 269
 270                 // Check permissions on root of filesystem
 271                 if( !VFS_CheckACL(curNode, VFS_PERM_EXECUTE) ) {
 272                         if(curNode->Close)      curNode->Close( curNode );
 273                         if(TruePath) {
 274                                 free(*TruePath);
 275                                 *TruePath = NULL;
 276                         }
 277                         //Log("Permissions fail on '%s'", Path);
 278                         LEAVE('n');
 279                         return NULL;
 280                 }
 281
 282                 // Check if the node has a FindDir method
 283                 if( !curNode->FindDir )
 284                 {
 285                         if(curNode->Close)      curNode->Close(curNode);
 286                         if(TruePath) {
 287                                 free(*TruePath);
 288                                 *TruePath = NULL;
 289                         }
 290                         //Log("FindDir fail on '%s'", Path);
 291                         LEAVE('n');
 292                         return NULL;
 293                 }
 294                 LOG("FindDir{=%p}(%p, '%s')", curNode->FindDir, curNode, pathEle);
 295                 // Get Child Node
 296                 tmpNode = curNode->FindDir(curNode, pathEle);
 297                 LOG("tmpNode = %p", tmpNode);
 298                 if(curNode->Close) {
 299                         //LOG2("curNode->Close = %p", curNode->Close);
 300                         curNode->Close(curNode);
 301                 }
 302                 curNode = tmpNode;
 303
 304                 // Error Check
 305                 if(!curNode) {
 306                         LOG("Node '%s' not found in dir '%s'", pathEle, Path);
 307                         if(TruePath) {
 308                                 free(*TruePath);
 309                                 *TruePath = NULL;
 310                         }
 311                         //Log("Child fail on '%s' ('%s)", Path, pathEle);
 312                         LEAVE('n');
 313                         return NULL;
 314                 }
 315
 316                 // Handle Symbolic Links
 317                 if(curNode->Flags & VFS_FFLAG_SYMLINK) {
 318                         if(TruePath) {
 319                                 free(*TruePath);
 320                                 *TruePath = NULL;
 321                         }
 322                         if(!curNode->Read) {
 323                                 Log_Warning("VFS", "VFS_ParsePath - Read of symlink node %p'%s' is NULL",
 324                                         curNode, Path);
 325                                 if(curNode->Close)      curNode->Close(curNode);
 326                                 // No need to free *TruePath, it should already be NULL
 327                                 LEAVE('n');
 328                                 return NULL;
 329                         }
 330
 331                         if(iNestedLinks > MAX_NESTED_LINKS) {
 332                                 if(curNode->Close)      curNode->Close(curNode);
 333                                 LEAVE('n');
 334                                 return NULL;
 335                         }
 336
 337                         // Parse Symlink Path
 338                         // - Just update the path variable and restart the function
 339                         // > Count nested symlinks and limit to some value (counteracts loops)
 340                         {
 341                                  int    remlen = strlen(Path) - (ofs + nextSlash);
 342                                 if( curNode->Size + remlen > MAX_PATH_LEN ) {
 343                                         if(curNode->Close)      curNode->Close(curNode);
 344                                         Log_Warning("VFS", "VFS_ParsePath - Symlinked path too long");
 345                                         LEAVE('n');
 346                                         return NULL;
 347                                 }
 348                                 curNode->Read( curNode, 0, curNode->Size, path_buffer );
 349                                 path_buffer[ curNode->Size ] = '\0';
 350                                 strcat(path_buffer, Path + ofs+nextSlash);
 351
 352                                 Path = path_buffer;
 353 //                              Log_Debug("VFS", "VFS_ParsePath: Symlink translated to '%s'", Path);
 354                                 iNestedLinks ++;
 355                         }
 356
 357                         // EVIL: Goto :)
 358                         goto restart_parse;
 359                 }
 360
 361                 // Handle Non-Directories
 362                 if( !(curNode->Flags & VFS_FFLAG_DIRECTORY) )
 363                 {
 364                         Log_Warning("VFS", "VFS_ParsePath - Path segment is not a directory");
 365                         if(TruePath)    free(*TruePath);
 366                         LEAVE('n');
 367                         return NULL;
 368                 }
 369
 370                 // Check if path needs extending
 371                 if(!TruePath)   continue;
 372
 373                 // Increase buffer space
 374                 tmp = realloc( *TruePath, retLength + strlen(pathEle) + 1 + 1 );
 375                 // Check if allocation succeeded
 376                 if(!tmp) {
 377                         Log_Warning("VFS", "VFS_ParsePath - Unable to reallocate true path buffer");
 378                         free(*TruePath);
 379                         *TruePath = NULL;
 380                         if(curNode->Close)      curNode->Close(curNode);
 381                         LEAVE('n');
 382                         return NULL;
 383                 }
 384                 *TruePath = tmp;
 385                 // Append to path
 386                 (*TruePath)[retLength] = '/';
 387                 strcpy(*TruePath+retLength+1, pathEle);
 388
 389                 LOG("*TruePath = '%s'", *TruePath);
 390
 391                 // - Extend Path
 392                 retLength += nextSlash + 1;
 393         }
 394
 395         if( !curNode->FindDir ) {
 396                 if(curNode->Close)      curNode->Close(curNode);
 397                 if(TruePath) {
 398                         free(*TruePath);
 399                         *TruePath = NULL;
 400                 }
 401                 Log_Warning("VFS", "VFS_ParsePath - FindDir doesn't exist for element of '%s'", Path);
 402                 LEAVE('n');
 403                 return NULL;
 404         }
 405
 406         // Get last node
 407         LOG("FindDir(%p, '%s')", curNode, &Path[ofs]);
 408         tmpNode = curNode->FindDir(curNode, &Path[ofs]);
 409         LOG("tmpNode = %p", tmpNode);
 410         if(curNode->Close)      curNode->Close(curNode);
 411         // Check if file was found
 412         if(!tmpNode) {
 413                 LOG("Node '%s' not found in dir '%s'", &Path[ofs], Path);
 414                 //Log("Child fail '%s' ('%s')", Path, &Path[ofs]);
 415                 if(TruePath)    free(*TruePath);
 416                 if(curNode->Close)      curNode->Close(curNode);
 417                 LEAVE('n');
 418                 return NULL;
 419         }
 420
 421         if(TruePath)
 422         {
 423                 // Increase buffer space
 424                 tmp = realloc(*TruePath, retLength + strlen(&Path[ofs]) + 1 + 1);
 425                 // Check if allocation succeeded
 426                 if(!tmp) {
 427                         Log_Warning("VFS", "VFS_ParsePath -  Unable to reallocate true path buffer");
 428                         free(*TruePath);
 429                         if(tmpNode->Close)      tmpNode->Close(curNode);
 430                         LEAVE('n');
 431                         return NULL;
 432                 }
 433                 *TruePath = tmp;
 434                 // Append to path
 435                 (*TruePath)[retLength] = '/';
 436                 strcpy(*TruePath + retLength + 1, &Path[ofs]);
 437                 // - Extend Path
 438                 //retLength += strlen(tmpNode->Name) + 1;
 439         }
 440
 441         if( MountPoint ) {
 442                 *MountPoint = mnt;
 443         }
 444
 445         LEAVE('p', tmpNode);
 446         return tmpNode;
 447 }
 448
 449 /**
 450  * \brief Create and return a handle number for the given node and mode
 451  */
 452 int VFS_int_CreateHandle( tVFS_Node *Node, tVFS_Mount *Mount, int Mode )
 453 {
 454          int    i;
 455
 456         ENTER("pNode pMount iMode", Node, Mount, Mode);
 457
 458         i = 0;
 459         i |= (Mode & VFS_OPENFLAG_EXEC) ? VFS_PERM_EXECUTE : 0;
 460         i |= (Mode & VFS_OPENFLAG_READ) ? VFS_PERM_READ : 0;
 461         i |= (Mode & VFS_OPENFLAG_WRITE) ? VFS_PERM_WRITE : 0;
 462
 463         LOG("i = 0b%b", i);
 464
 465         // Permissions Check
 466         if( !VFS_CheckACL(Node, i) ) {
 467                 if(Node->Close) Node->Close( Node );
 468                 Log_Log("VFS", "VFS_int_CreateHandle: Permissions Failed");
 469                 errno = EACCES;
 470                 LEAVE_RET('i', -1);
 471         }
 472
 473         i = VFS_AllocHandle( !!(Mode & VFS_OPENFLAG_USER), Node, Mode );
 474         if( i < 0 ) {
 475                 Log_Notice("VFS", "VFS_int_CreateHandle: Out of handles");
 476                 errno = ENFILE;
 477                 LEAVE_RET('i', -1);
 478         }
 479
 480         VFS_GetHandle(i)->Mount = Mount;
 481
 482         LEAVE_RET('x', i);
 483 }
 484
 485 /**
 486  * \fn int VFS_Open(const char *Path, Uint Mode)
 487  * \brief Open a file
 488  */
 489 int VFS_Open(const char *Path, Uint Mode)
 490 {
 491         tVFS_Node       *node;
 492         tVFS_Mount      *mnt;
 493         char    *absPath;
 494
 495         ENTER("sPath xMode", Path, Mode);
 496
 497         // Get absolute path
 498         absPath = VFS_GetAbsPath(Path);
 499         if(absPath == NULL) {
 500                 Log_Warning("VFS", "VFS_Open: Path expansion failed '%s'", Path);
 501                 LEAVE_RET('i', -1);
 502         }
 503         LOG("absPath = \"%s\"", absPath);
 504         // Parse path and get mount point
 505         node = VFS_ParsePath(absPath, NULL, &mnt);
 506         // Free generated path
 507         free(absPath);
 508
 509         if(!node) {
 510                 LOG("Cannot find node");
 511                 errno = ENOENT;
 512                 LEAVE_RET('i', -1);
 513         }
 514
 515         // Check for symlinks
 516         if( !(Mode & VFS_OPENFLAG_NOLINK) && (node->Flags & VFS_FFLAG_SYMLINK) )
 517         {
 518                 char    tmppath[node->Size+1];
 519                 if( node->Size > MAX_PATH_LEN ) {
 520                         Log_Warning("VFS", "VFS_Open - Symlink is too long (%i)", node->Size);
 521                         LEAVE_RET('i', -1);
 522                 }
 523                 if( !node->Read ) {
 524                         Log_Warning("VFS", "VFS_Open - No read method on symlink");
 525                         LEAVE_RET('i', -1);
 526                 }
 527                 // Read symlink's path
 528                 node->Read( node, 0, node->Size, tmppath );
 529                 tmppath[ node->Size ] = '\0';
 530                 if(node->Close) node->Close( node );
 531                 // Open the target
 532                 node = VFS_ParsePath(tmppath, NULL, &mnt);
 533                 if(!node) {
 534                         LOG("Cannot find symlink target node (%s)", tmppath);
 535                         errno = ENOENT;
 536                         LEAVE_RET('i', -1);
 537                 }
 538         }
 539
 540         LEAVE_RET('x', VFS_int_CreateHandle(node, mnt, Mode));
 541 }
 542
 543
 544 /**
 545  * \brief Open a file from an open directory
 546  */
 547 int VFS_OpenChild(int FD, const char *Name, Uint Mode)
 548 {
 549         tVFS_Handle     *h;
 550         tVFS_Node       *node;
 551
 552         ENTER("xFD sName xMode", FD, Name, Mode);
 553
 554         // Get handle
 555         h = VFS_GetHandle(FD);
 556         if(h == NULL) {
 557                 Log_Warning("VFS", "VFS_OpenChild - Invalid file handle 0x%x", FD);
 558                 errno = EINVAL;
 559                 LEAVE_RET('i', -1);
 560         }
 561
 562         // Check for directory
 563         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 564                 Log_Warning("VFS", "VFS_OpenChild - Passed handle is not a directory", FD);
 565                 errno = ENOTDIR;
 566                 LEAVE_RET('i', -1);
 567         }
 568
 569         // Find Child
 570         node = h->Node->FindDir(h->Node, Name);
 571         if(!node) {
 572                 errno = ENOENT;
 573                 LEAVE_RET('i', -1);
 574         }
 575
 576         LEAVE_RET('x', VFS_int_CreateHandle(node, h->Mount, Mode));
 577 }
 578
 579 int VFS_OpenInode(Uint32 Mount, Uint64 Inode, int Mode)
 580 {
 581         tVFS_Mount      *mnt;
 582         tVFS_Node       *node;
 583
 584         ENTER("iMount XInode xMode", Mount, Inode, Mode);
 585
 586         // Get mount point
 587         mnt = VFS_GetMountByIdent(Mount);
 588         if( !mnt ) {
 589                 LOG("Mount point ident invalid");
 590                 errno = ENOENT;
 591                 LEAVE_RET('i', -1);
 592         }
 593
 594         // Does the filesystem support this?
 595         if( !mnt->Filesystem->GetNodeFromINode ) {
 596                 LOG("Filesystem does not support inode accesses");
 597                 errno = ENOENT;
 598                 LEAVE_RET('i', -1);
 599         }
 600
 601         // Get node
 602         node = mnt->Filesystem->GetNodeFromINode(mnt->RootNode, Inode);
 603         if( !node ) {
 604                 LOG("Unable to find inode");
 605                 errno = ENOENT;
 606                 LEAVE_RET('i', -1);
 607         }
 608
 609         LEAVE_RET('x', VFS_int_CreateHandle(node, mnt, Mode));
 610 }
 611
 612 /**
 613  * \fn void VFS_Close(int FD)
 614  * \brief Closes an open file handle
 615  */
 616 void VFS_Close(int FD)
 617 {
 618         tVFS_Handle     *h;
 619
 620         // Get handle
 621         h = VFS_GetHandle(FD);
 622         if(h == NULL) {
 623                 Log_Warning("VFS", "Invalid file handle passed to VFS_Close, 0x%x", FD);
 624                 return;
 625         }
 626
 627         #if VALIDATE_VFS_FUNCTIPONS
 628         if(h->Node->Close && !MM_GetPhysAddr(h->Node->Close)) {
 629                 Log_Warning("VFS", "Node %p's ->Close method is invalid (%p)",
 630                         h->Node, h->Node->Close);
 631                 return ;
 632         }
 633         #endif
 634
 635         if(h->Node->Close)
 636                 h->Node->Close( h->Node );
 637
 638         h->Node = NULL;
 639 }
 640
 641 /**
 642  * \brief Change current working directory
 643  */
 644 int VFS_ChDir(const char *Dest)
 645 {
 646         char    *buf;
 647          int    fd;
 648         tVFS_Handle     *h;
 649
 650         // Create Absolute
 651         buf = VFS_GetAbsPath(Dest);
 652         if(buf == NULL) {
 653                 Log("VFS_ChDir: Path expansion failed");
 654                 return -1;
 655         }
 656
 657         // Check if path exists
 658         fd = VFS_Open(buf, VFS_OPENFLAG_EXEC);
 659         if(fd == -1) {
 660                 Log("VFS_ChDir: Path is invalid");
 661                 return -1;
 662         }
 663
 664         // Get node so we can check for directory
 665         h = VFS_GetHandle(fd);
 666         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 667                 Log("VFS_ChDir: Path is not a directory");
 668                 VFS_Close(fd);
 669                 return -1;
 670         }
 671
 672         // Close file
 673         VFS_Close(fd);
 674
 675         // Free old working directory
 676         if( CFGPTR(CFG_VFS_CWD) )
 677                 free( CFGPTR(CFG_VFS_CWD) );
 678         // Set new
 679         CFGPTR(CFG_VFS_CWD) = buf;
 680
 681         Log("Updated CWD to '%s'", buf);
 682
 683         return 1;
 684 }
 685
 686 /**
 687  * \fn int VFS_ChRoot(char *New)
 688  * \brief Change current root directory
 689  */
 690 int VFS_ChRoot(const char *New)
 691 {
 692         char    *buf;
 693          int    fd;
 694         tVFS_Handle     *h;
 695
 696         if(New[0] == '/' && New[1] == '\0')
 697                 return 1;       // What a useless thing to ask!
 698
 699         // Create Absolute
 700         buf = VFS_GetAbsPath(New);
 701         if(buf == NULL) {
 702                 LOG("Path expansion failed");
 703                 return -1;
 704         }
 705
 706         // Check if path exists
 707         fd = VFS_Open(buf, VFS_OPENFLAG_EXEC);
 708         if(fd == -1) {
 709                 LOG("Path is invalid");
 710                 return -1;
 711         }
 712
 713         // Get node so we can check for directory
 714         h = VFS_GetHandle(fd);
 715         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 716                 LOG("Path is not a directory");
 717                 VFS_Close(fd);
 718                 return -1;
 719         }
 720
 721         // Close file
 722         VFS_Close(fd);
 723
 724         // Free old working directory
 725         if( CFGPTR(CFG_VFS_CHROOT) )
 726                 free( CFGPTR(CFG_VFS_CHROOT) );
 727         // Set new
 728         CFGPTR(CFG_VFS_CHROOT) = buf;
 729
 730         LOG("Updated Root to '%s'", buf);
 731
 732         return 1;
 733 }
 734
 735 // === EXPORTS ===
 736 EXPORT(VFS_Open);
 737 EXPORT(VFS_Close);