Kernel/vfs/open.c

   1 /*
   2  * AcessMicro VFS
   3  * - Open, Close and ChDir
   4  */
   5 #define DEBUG   0
   6 #include <acess.h>
   7 #include <mm_virt.h>
   8 #include "vfs.h"
   9 #include "vfs_int.h"
  10 #include "vfs_ext.h"
  11
  12 // === CONSTANTS ===
  13 #define OPEN_MOUNT_ROOT 1
  14 #define MAX_KERNEL_FILES        128
  15 #define MAX_PATH_SLASHES        256
  16
  17 // === IMPORTS ===
  18 extern tVFS_Node        gVFS_MemRoot;
  19 extern tVFS_Mount       *gVFS_RootMount;
  20
  21 // === GLOBALS ===
  22 tVFS_Handle     *gaUserHandles = (void*)MM_PPD_VFS;
  23 tVFS_Handle     *gaKernelHandles = (void*)MM_KERNEL_VFS;
  24
  25 // === CODE ===
  26 /**
  27  * \fn char *VFS_GetAbsPath(char *Path)
  28  * \brief Create an absolute path from a relative one
  29  */
  30 char *VFS_GetAbsPath(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         char    *chroot = CFGPTR(CFG_VFS_CHROOT);
  39          int    chrootLen;
  40         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                         Warning("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(pathLen + 1);
  68                 if(!ret) {
  69                         Warning("VFS_GetAbsPath - malloc() returned NULL");
  70                         return NULL;
  71                 }
  72                 strcpy(ret, Path);
  73         } else {
  74                 if(cwd == NULL) {
  75                         cwd = "/";
  76                         cwdLen = 1;
  77                 }
  78                 else {
  79                         cwdLen = strlen(cwd);
  80                 }
  81                 // Prepend the current directory
  82                 ret = malloc( cwdLen + 1 + pathLen + 1 );
  83                 strcpy(ret, cwd);
  84                 ret[cwdLen] = '/';
  85                 strcpy(&ret[cwdLen+1], Path);
  86                 //Log("ret = '%s'\n", ret);
  87         }
  88
  89         // Parse Path
  90         pathComps[iPos++] = tmpStr = ret+1;
  91         while(*tmpStr)
  92         {
  93                 if(*tmpStr++ == '/')
  94                 {
  95                         pathComps[iPos++] = tmpStr;
  96                         if(iPos == MAX_PATH_SLASHES) {
  97                                 LOG("Path '%s' has too many elements", Path);
  98                                 free(ret);
  99                                 LEAVE('n');
 100                                 return NULL;
 101                         }
 102                 }
 103         }
 104         pathComps[iPos] = NULL;
 105
 106         // Cleanup
 107         iPos2 = iPos = 0;
 108         while(pathComps[iPos])
 109         {
 110                 tmpStr = pathComps[iPos];
 111                 // Always Increment iPos
 112                 iPos++;
 113                 // ..
 114                 if(tmpStr[0] == '.' && tmpStr[1] == '.' && (tmpStr[2] == '/' || tmpStr[2] == '\0') )
 115                 {
 116                         if(iPos2 != 0)
 117                                 iPos2 --;
 118                         continue;
 119                 }
 120                 // .
 121                 if(tmpStr[0] == '.' && (tmpStr[1] == '/' || tmpStr[1] == '\0') )
 122                 {
 123                         continue;
 124                 }
 125                 // Empty
 126                 if(tmpStr[0] == '/' || tmpStr[0] == '\0')
 127                 {
 128                         continue;
 129                 }
 130
 131                 // Set New Position
 132                 pathComps[iPos2] = tmpStr;
 133                 iPos2++;
 134         }
 135         pathComps[iPos2] = NULL;
 136
 137         // Build New Path
 138         iPos2 = 1;      iPos = 0;
 139         ret[0] = '/';
 140         while(pathComps[iPos])
 141         {
 142                 tmpStr = pathComps[iPos];
 143                 while(*tmpStr && *tmpStr != '/')
 144                 {
 145                         ret[iPos2++] = *tmpStr;
 146                         tmpStr++;
 147                 }
 148                 ret[iPos2++] = '/';
 149                 iPos++;
 150         }
 151         if(iPos2 > 1)
 152                 ret[iPos2-1] = 0;
 153         else
 154                 ret[iPos2] = 0;
 155
 156
 157         // Prepend the chroot
 158         tmpStr = malloc(chrootLen + strlen(ret) + 1);
 159         strcpy( tmpStr, chroot );
 160         strcpy( tmpStr+chrootLen, ret );
 161         free(ret);
 162         ret = tmpStr;
 163
 164         LEAVE('s', ret);
 165         //Log("VFS_GetAbsPath: RETURN '%s'", ret);
 166         return ret;
 167 }
 168
 169 /**
 170  * \fn char *VFS_ParsePath(char *Path, char **TruePath)
 171  * \brief Parses a path, resolving sysmlinks and applying permissions
 172  */
 173 tVFS_Node *VFS_ParsePath(char *Path, char **TruePath)
 174 {
 175         tVFS_Mount      *mnt;
 176         tVFS_Mount      *longestMount = gVFS_RootMount; // Root is first
 177          int    cmp, retLength = 0;
 178          int    ofs, nextSlash;
 179         tVFS_Node       *curNode, *tmpNode;
 180         char    *tmp;
 181
 182         ENTER("sPath pTruePath", Path, TruePath);
 183
 184         // Memory File
 185         if(Path[0] == '$') {
 186                 if(TruePath) {
 187                         *TruePath = malloc(strlen(Path)+1);
 188                         strcpy(*TruePath, Path);
 189                 }
 190                 curNode = gVFS_MemRoot.FindDir(&gVFS_MemRoot, Path);
 191                 LEAVE('p', curNode);
 192                 return curNode;
 193         }
 194         // For root we always fast return
 195
 196         if(Path[0] == '/' && Path[1] == '\0') {
 197                 if(TruePath) {
 198                         *TruePath = malloc( gVFS_RootMount->MountPointLen+1 );
 199                         strcpy(*TruePath, gVFS_RootMount->MountPoint);
 200                 }
 201                 LEAVE('p', gVFS_RootMount->RootNode);
 202                 return gVFS_RootMount->RootNode;
 203         }
 204
 205         // Check if there is anything mounted
 206         if(!gVFS_Mounts) {
 207                 Warning("WTF! There's nothing mounted?");
 208                 return NULL;
 209         }
 210
 211         // Find Mountpoint
 212         for(mnt = gVFS_Mounts;
 213                 mnt;
 214                 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                         LEAVE('p', mnt->RootNode);
 232                         return mnt->RootNode;
 233                 }
 234                 #endif
 235                 // Not a match, continue
 236                 if(cmp != '/')  continue;
 237                 longestMount = mnt;
 238         }
 239
 240         // Sanity Check
 241         /*if(!longestMount) {
 242                 Log("VFS_ParsePath - ERROR: No Root Node\n");
 243                 return NULL;
 244         }*/
 245
 246         // Save to shorter variable
 247         mnt = longestMount;
 248
 249         LOG("mnt = {MountPoint:\"%s\"}", mnt->MountPoint);
 250
 251         // Initialise String
 252         if(TruePath)
 253         {
 254                 *TruePath = malloc( mnt->MountPointLen+1 );
 255                 strcpy(*TruePath, mnt->MountPoint);
 256                 retLength = mnt->MountPointLen;
 257         }
 258
 259         curNode = mnt->RootNode;
 260         curNode->ReferenceCount ++;
 261         // Parse Path
 262         ofs = mnt->MountPointLen+1;
 263         for(; (nextSlash = strpos(&Path[ofs], '/')) != -1; Path[nextSlash]='/',ofs = nextSlash + 1)
 264         {
 265                 nextSlash += ofs;
 266                 Path[nextSlash] = '\0';
 267
 268                 // Check for empty string
 269                 if( Path[ofs] == '\0' ) continue;
 270
 271                 // Check permissions on root of filesystem
 272                 if( !VFS_CheckACL(curNode, VFS_PERM_EXECUTE) ) {
 273                         if(curNode->Close)      curNode->Close( curNode );
 274                         if(TruePath) {
 275                                 free(*TruePath);
 276                                 *TruePath = NULL;
 277                         }
 278                         //Log("Permissions fail on '%s'", Path);
 279                         LEAVE('n');
 280                         return NULL;
 281                 }
 282
 283                 // Check if the node has a FindDir method
 284                 if( !curNode->FindDir )
 285                 {
 286                         if(curNode->Close)      curNode->Close(curNode);
 287                         if(TruePath) {
 288                                 free(*TruePath);
 289                                 *TruePath = NULL;
 290                         }
 291                         Path[nextSlash] = '/';
 292                         //Log("FindDir fail on '%s'", Path);
 293                         LEAVE('n');
 294                         return NULL;
 295                 }
 296                 LOG("FindDir(%p, '%s')", curNode, &Path[ofs]);
 297                 // Get Child Node
 298                 tmpNode = curNode->FindDir(curNode, &Path[ofs]);
 299                 LOG("tmpNode = %p", tmpNode);
 300                 if(curNode->Close)      curNode->Close(curNode);
 301                 curNode = tmpNode;
 302
 303                 // Error Check
 304                 if(!curNode) {
 305                         LOG("Node '%s' not found in dir '%s'", &Path[ofs], Path);
 306                         if(TruePath) {
 307                                 free(*TruePath);
 308                                 *TruePath = NULL;
 309                         }
 310                         //Log("Child fail on '%s' ('%s)", Path, &Path[ofs]);
 311                         Path[nextSlash] = '/';
 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                         tmp = malloc( curNode->Size + 1 );
 323                         if(!curNode->Read) {
 324                                 Warning("VFS_ParsePath - Read of node %p is NULL (%s)",
 325                                         curNode, Path);
 326                                 if(curNode->Close)      curNode->Close(curNode);
 327                                 LEAVE('n');
 328                                 return NULL;
 329                         }
 330                         curNode->Read( curNode, 0, curNode->Size, tmp );
 331                         tmp[ curNode->Size ] = '\0';
 332
 333                         // Parse Symlink Path
 334                         curNode = VFS_ParsePath(tmp, TruePath);
 335
 336                         // Error Check
 337                         if(!curNode) {
 338                                 Log("Symlink fail '%s'", tmp);
 339                                 free(tmp);      // Free temp string
 340                                 LEAVE('n');
 341                                 return NULL;
 342                         }
 343
 344                         // Set Path Variable
 345                         if(TruePath) {
 346                                 *TruePath = tmp;
 347                                 retLength = strlen(tmp);
 348                         } else {
 349                                 free(tmp);      // Free temp string
 350                         }
 351
 352                         continue;
 353                 }
 354
 355                 // Handle Non-Directories
 356                 if( !(curNode->Flags & VFS_FFLAG_DIRECTORY) )
 357                 {
 358                         Warning("VFS_ParsePath - File in directory context");
 359                         if(TruePath)    free(*TruePath);
 360                         LEAVE('n');
 361                         return NULL;
 362                 }
 363
 364                 // Check if path needs extending
 365                 if(!TruePath)   continue;
 366
 367                 // Increase buffer space
 368                 tmp = realloc( *TruePath, retLength + strlen(&Path[ofs]) + 1 + 1 );
 369                 // Check if allocation succeeded
 370                 if(!tmp) {
 371                         Warning("VFS_ParsePath -  Unable to reallocate true path buffer");
 372                         free(*TruePath);
 373                         if(curNode->Close)      curNode->Close(curNode);
 374                         LEAVE('n');
 375                         return NULL;
 376                 }
 377                 *TruePath = tmp;
 378                 // Append to path
 379                 (*TruePath)[retLength] = '/';
 380                 strcpy(*TruePath+retLength+1, &Path[ofs]);
 381                 // - Extend Path
 382                 retLength += strlen(&Path[ofs])+1;
 383         }
 384
 385         // Get last node
 386         LOG("VFS_ParsePath: FindDir(%p, '%s')", curNode, &Path[ofs]);
 387         tmpNode = curNode->FindDir(curNode, &Path[ofs]);
 388         LOG("tmpNode = %p", tmpNode);
 389         if(curNode->Close)      curNode->Close(curNode);
 390         // Check if file was found
 391         if(!tmpNode) {
 392                 LOG("Node '%s' not found in dir '%s'", &Path[ofs], Path);
 393                 //Log("Child fail '%s' ('%s')", Path, &Path[ofs]);
 394                 if(TruePath)    free(*TruePath);
 395                 if(curNode->Close)      curNode->Close(curNode);
 396                 LEAVE('n');
 397                 return NULL;
 398         }
 399
 400         if(TruePath)
 401         {
 402                 // Increase buffer space
 403                 tmp = realloc(*TruePath, retLength + strlen(&Path[ofs]) + 1 + 1);
 404                 // Check if allocation succeeded
 405                 if(!tmp) {
 406                         Warning("VFS_ParsePath -  Unable to reallocate true path buffer");
 407                         free(*TruePath);
 408                         if(tmpNode->Close)      tmpNode->Close(curNode);
 409                         LEAVE('n');
 410                         return NULL;
 411                 }
 412                 *TruePath = tmp;
 413                 // Append to path
 414                 (*TruePath)[retLength] = '/';
 415                 strcpy(*TruePath + retLength + 1, &Path[ofs]);
 416                 // - Extend Path
 417                 //retLength += strlen(tmpNode->Name) + 1;
 418         }
 419
 420         LEAVE('p', tmpNode);
 421         return tmpNode;
 422 }
 423
 424 /**
 425  * \fn int VFS_Open(char *Path, Uint Mode)
 426  * \brief Open a file
 427  */
 428 int VFS_Open(char *Path, Uint Mode)
 429 {
 430         tVFS_Node       *node;
 431         char    *absPath;
 432          int    i;
 433
 434         ENTER("sPath xMode", Path, Mode);
 435
 436         // Get absolute path
 437         absPath = VFS_GetAbsPath(Path);
 438         LOG("absPath = \"%s\"", absPath);
 439         // Parse path and get mount point
 440         node = VFS_ParsePath(absPath, NULL);
 441         // Free generated path
 442         free(absPath);
 443
 444         if(!node) {
 445                 LOG("Cannot find node");
 446                 LEAVE('i', -1);
 447                 return -1;
 448         }
 449
 450         // Check for symlinks
 451         if( !(Mode & VFS_OPENFLAG_NOLINK) && (node->Flags & VFS_FFLAG_SYMLINK) )
 452         {
 453                 if( !node->Read ) {
 454                         Warning("No read method on symlink");
 455                         LEAVE('i', -1);
 456                         return -1;
 457                 }
 458                 absPath = malloc(node->Size+1); // Allocate Buffer
 459                 node->Read( node, 0, node->Size, absPath );     // Read Path
 460
 461                 absPath[ node->Size ] = '\0';   // End String
 462                 if(node->Close) node->Close( node );    // Close old node
 463                 node = VFS_ParsePath(absPath, NULL);    // Get new node
 464                 free( absPath );        // Free allocated path
 465         }
 466
 467         if(!node) {
 468                 LOG("Cannot find node");
 469                 LEAVE('i', -1);
 470                 return -1;
 471         }
 472
 473         i = 0;
 474         i |= (Mode & VFS_OPENFLAG_EXEC) ? VFS_PERM_EXECUTE : 0;
 475         i |= (Mode & VFS_OPENFLAG_READ) ? VFS_PERM_READ : 0;
 476         i |= (Mode & VFS_OPENFLAG_WRITE) ? VFS_PERM_WRITE : 0;
 477
 478         LOG("i = 0b%b", i);
 479
 480         // Permissions Check
 481         if( !VFS_CheckACL(node, i) ) {
 482                 if(node->Close) node->Close( node );
 483                 Log("VFS_Open: Permissions Failed");
 484                 LEAVE('i', -1);
 485                 return -1;
 486         }
 487
 488         // Check for a user open
 489         if(Mode & VFS_OPENFLAG_USER)
 490         {
 491                 // Allocate Buffer
 492                 if( MM_GetPhysAddr( (Uint)gaUserHandles ) == 0 )
 493                 {
 494                         Uint    addr, size;
 495                         size = CFGINT(CFG_VFS_MAXFILES) * sizeof(tVFS_Handle);
 496                         for(addr = 0; addr < size; addr += 0x1000)
 497                                 MM_Allocate( (Uint)gaUserHandles + addr );
 498                         memset( gaUserHandles, 0, size );
 499                 }
 500                 // Get a handle
 501                 for(i=0;i<CFGINT(CFG_VFS_MAXFILES);i++)
 502                 {
 503                         if(gaUserHandles[i].Node)       continue;
 504                         gaUserHandles[i].Node = node;
 505                         gaUserHandles[i].Position = 0;
 506                         gaUserHandles[i].Mode = Mode;
 507                         LEAVE('i', i);
 508                         return i;
 509                 }
 510         }
 511         else
 512         {
 513                 // Allocate space if not already
 514                 if( MM_GetPhysAddr( (Uint)gaKernelHandles ) == 0 )
 515                 {
 516                         Uint    addr, size;
 517                         size = MAX_KERNEL_FILES * sizeof(tVFS_Handle);
 518                         for(addr = 0; addr < size; addr += 0x1000)
 519                                 MM_Allocate( (Uint)gaKernelHandles + addr );
 520                         memset( gaKernelHandles, 0, size );
 521                 }
 522                 // Get a handle
 523                 for(i=0;i<MAX_KERNEL_FILES;i++)
 524                 {
 525                         if(gaKernelHandles[i].Node)     continue;
 526                         gaKernelHandles[i].Node = node;
 527                         gaKernelHandles[i].Position = 0;
 528                         gaKernelHandles[i].Mode = Mode;
 529                         LEAVE('x', i|VFS_KERNEL_FLAG);
 530                         return i|VFS_KERNEL_FLAG;
 531                 }
 532         }
 533
 534         Log("VFS_Open: Out of handles");
 535         LEAVE('i', -1);
 536         return -1;
 537 }
 538
 539
 540 /**
 541  * \brief Open a file from an open directory
 542  */
 543 int VFS_OpenChild(Uint *Errno, int FD, char *Name, Uint Mode)
 544 {
 545         tVFS_Handle     *h;
 546         tVFS_Node       *node;
 547          int    i;
 548
 549         // Get handle
 550         h = VFS_GetHandle(FD);
 551         if(h == NULL) {
 552                 Log_Warning("VFS", "VFS_OpenChild - Invalid file handle 0x%x", FD);
 553                 if(Errno)       *Errno = EINVAL;
 554                 LEAVE('i', -1);
 555                 return -1;
 556         }
 557
 558         // Check for directory
 559         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 560                 Log_Warning("VFS", "VFS_OpenChild - Passed handle is not a directory", FD);
 561                 if(Errno)       *Errno = ENOTDIR;
 562                 LEAVE('i', -1);
 563                 return -1;
 564         }
 565
 566         // Find Child
 567         node = h->Node->FindDir(h->Node, Name);
 568         if(!node) {
 569                 if(Errno)       *Errno = ENOENT;
 570                 LEAVE('i', -1);
 571                 return -1;
 572         }
 573
 574         i = 0;
 575         i |= (Mode & VFS_OPENFLAG_EXEC) ? VFS_PERM_EXECUTE : 0;
 576         i |= (Mode & VFS_OPENFLAG_READ) ? VFS_PERM_READ : 0;
 577         i |= (Mode & VFS_OPENFLAG_WRITE) ? VFS_PERM_WRITE : 0;
 578
 579         // Permissions Check
 580         if( !VFS_CheckACL(node, i) ) {
 581                 if(node->Close) node->Close( node );
 582                 Log_Notice("VFS", "VFS_OpenChild - Permissions Failed");
 583                 if(Errno)       *Errno = EACCES;
 584                 LEAVE('i', -1);
 585                 return -1;
 586         }
 587
 588         // Check for a user open
 589         if(Mode & VFS_OPENFLAG_USER)
 590         {
 591                 // Allocate Buffer
 592                 if( MM_GetPhysAddr( (Uint)gaUserHandles ) == 0 )
 593                 {
 594                         Uint    addr, size;
 595                         size = CFGINT(CFG_VFS_MAXFILES) * sizeof(tVFS_Handle);
 596                         for(addr = 0; addr < size; addr += 0x1000)
 597                                 MM_Allocate( (Uint)gaUserHandles + addr );
 598                         memset( gaUserHandles, 0, size );
 599                 }
 600                 // Get a handle
 601                 for(i=0;i<CFGINT(CFG_VFS_MAXFILES);i++)
 602                 {
 603                         if(gaUserHandles[i].Node)       continue;
 604                         gaUserHandles[i].Node = node;
 605                         gaUserHandles[i].Position = 0;
 606                         gaUserHandles[i].Mode = Mode;
 607                         LEAVE('i', i);
 608                         return i;
 609                 }
 610         }
 611         else
 612         {
 613                 // Allocate space if not already
 614                 if( MM_GetPhysAddr( (Uint)gaKernelHandles ) == 0 )
 615                 {
 616                         Uint    addr, size;
 617                         size = MAX_KERNEL_FILES * sizeof(tVFS_Handle);
 618                         for(addr = 0; addr < size; addr += 0x1000)
 619                                 MM_Allocate( (Uint)gaKernelHandles + addr );
 620                         memset( gaKernelHandles, 0, size );
 621                 }
 622                 // Get a handle
 623                 for(i=0;i<MAX_KERNEL_FILES;i++)
 624                 {
 625                         if(gaKernelHandles[i].Node)     continue;
 626                         gaKernelHandles[i].Node = node;
 627                         gaKernelHandles[i].Position = 0;
 628                         gaKernelHandles[i].Mode = Mode;
 629                         LEAVE('x', i|VFS_KERNEL_FLAG);
 630                         return i|VFS_KERNEL_FLAG;
 631                 }
 632         }
 633
 634         Log_Error("VFS", "VFS_OpenChild - Out of handles");
 635         if(Errno)       *Errno = ENFILE;
 636         LEAVE('i', -1);
 637         return -1;
 638 }
 639
 640 /**
 641  * \fn void VFS_Close(int FD)
 642  * \brief Closes an open file handle
 643  */
 644 void VFS_Close(int FD)
 645 {
 646         tVFS_Handle     *h;
 647
 648         // Get handle
 649         h = VFS_GetHandle(FD);
 650         if(h == NULL) {
 651                 Log_Warning("VFS", "Invalid file handle passed to VFS_Close, 0x%x\n", FD);
 652                 return;
 653         }
 654
 655         #if VALIDATE_VFS_FUNCTIPONS
 656         if(h->Node->Close && !MM_GetPhysAddr(h->Node->Close)) {
 657                 Log_Warning("VFS", "Node %p's ->Close method is invalid (%p)",
 658                         h->Node, h->Node->Close);
 659                 return ;
 660         }
 661         #endif
 662
 663         if(h->Node->Close)
 664                 h->Node->Close( h->Node );
 665
 666         h->Node = NULL;
 667 }
 668
 669 /**
 670  * \brief Change current working directory
 671  */
 672 int VFS_ChDir(char *Dest)
 673 {
 674         char    *buf;
 675          int    fd;
 676         tVFS_Handle     *h;
 677
 678         // Create Absolute
 679         buf = VFS_GetAbsPath(Dest);
 680         if(buf == NULL) {
 681                 Log("VFS_ChDir: Path expansion failed");
 682                 return -1;
 683         }
 684
 685         // Check if path exists
 686         fd = VFS_Open(buf, VFS_OPENFLAG_EXEC);
 687         if(fd == -1) {
 688                 Log("VFS_ChDir: Path is invalid");
 689                 return -1;
 690         }
 691
 692         // Get node so we can check for directory
 693         h = VFS_GetHandle(fd);
 694         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 695                 Log("VFS_ChDir: Path is not a directory");
 696                 VFS_Close(fd);
 697                 return -1;
 698         }
 699
 700         // Close file
 701         VFS_Close(fd);
 702
 703         // Free old working directory
 704         if( CFGPTR(CFG_VFS_CWD) )
 705                 free( CFGPTR(CFG_VFS_CWD) );
 706         // Set new
 707         CFGPTR(CFG_VFS_CWD) = buf;
 708
 709         Log("Updated CWD to '%s'", buf);
 710
 711         return 1;
 712 }
 713
 714 /**
 715  * \fn int VFS_ChRoot(char *New)
 716  * \brief Change current root directory
 717  */
 718 int VFS_ChRoot(char *New)
 719 {
 720         char    *buf;
 721          int    fd;
 722         tVFS_Handle     *h;
 723
 724         if(New[0] == '/' && New[1] == '\0')
 725                 return 1;       // What a useless thing to ask!
 726
 727         // Create Absolute
 728         buf = VFS_GetAbsPath(New);
 729         if(buf == NULL) {
 730                 LOG("Path expansion failed");
 731                 return -1;
 732         }
 733
 734         // Check if path exists
 735         fd = VFS_Open(buf, VFS_OPENFLAG_EXEC);
 736         if(fd == -1) {
 737                 LOG("Path is invalid");
 738                 return -1;
 739         }
 740
 741         // Get node so we can check for directory
 742         h = VFS_GetHandle(fd);
 743         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 744                 LOG("Path is not a directory");
 745                 VFS_Close(fd);
 746                 return -1;
 747         }
 748
 749         // Close file
 750         VFS_Close(fd);
 751
 752         // Free old working directory
 753         if( CFGPTR(CFG_VFS_CHROOT) )
 754                 free( CFGPTR(CFG_VFS_CHROOT) );
 755         // Set new
 756         CFGPTR(CFG_VFS_CHROOT) = buf;
 757
 758         LOG("Updated Root to '%s'", buf);
 759
 760         return 1;
 761 }
 762
 763 /**
 764  * \fn tVFS_Handle *VFS_GetHandle(int FD)
 765  * \brief Gets a pointer to the handle information structure
 766  */
 767 tVFS_Handle *VFS_GetHandle(int FD)
 768 {
 769         tVFS_Handle     *h;
 770
 771         //Log_Debug("VFS", "VFS_GetHandle: (FD=0x%x)", FD);
 772
 773         if(FD < 0)      return NULL;
 774
 775         if(FD & VFS_KERNEL_FLAG) {
 776                 FD &= (VFS_KERNEL_FLAG - 1);
 777                 if(FD >= MAX_KERNEL_FILES)      return NULL;
 778                 h = &gaKernelHandles[ FD ];
 779         } else {
 780                 if(FD >= CFGINT(CFG_VFS_MAXFILES))      return NULL;
 781                 h = &gaUserHandles[ FD ];
 782         }
 783
 784         if(h->Node == NULL)     return NULL;
 785         //Log_Debug("VFS", "VFS_GetHandle: RETURN %p", h);
 786         return h;
 787 }
 788
 789 // === EXPORTS ===
 790 EXPORT(VFS_Open);
 791 EXPORT(VFS_Close);