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(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         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(const 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; ofs = nextSlash + 1)
 264         {
 265                 char    pathEle[nextSlash+1];
 266
 267                 // Empty String
 268                 if(nextSlash == 0)      continue;
 269
 270                 memcpy(pathEle, &Path[ofs], nextSlash);
 271                 pathEle[nextSlash] = 0;
 272
 273                 // Check permissions on root of filesystem
 274                 if( !VFS_CheckACL(curNode, VFS_PERM_EXECUTE) ) {
 275                         if(curNode->Close)      curNode->Close( curNode );
 276                         if(TruePath) {
 277                                 free(*TruePath);
 278                                 *TruePath = NULL;
 279                         }
 280                         //Log("Permissions fail on '%s'", Path);
 281                         LEAVE('n');
 282                         return NULL;
 283                 }
 284
 285                 // Check if the node has a FindDir method
 286                 if( !curNode->FindDir )
 287                 {
 288                         if(curNode->Close)      curNode->Close(curNode);
 289                         if(TruePath) {
 290                                 free(*TruePath);
 291                                 *TruePath = NULL;
 292                         }
 293                         //Log("FindDir fail on '%s'", Path);
 294                         LEAVE('n');
 295                         return NULL;
 296                 }
 297                 LOG("FindDir(%p, '%s')", curNode, pathEle);
 298                 // Get Child Node
 299                 tmpNode = curNode->FindDir(curNode, pathEle);
 300                 LOG("tmpNode = %p", tmpNode);
 301                 if(curNode->Close)      curNode->Close(curNode);
 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                         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                         if(TruePath)
 336                                 Log_Debug("VFS", "*TruePath='%s'", *TruePath);
 337
 338                         // Error Check
 339                         if(!curNode) {
 340                                 Log("Symlink fail '%s'", tmp);
 341                                 free(tmp);      // Free temp string
 342                                 LEAVE('n');
 343                                 return NULL;
 344                         }
 345
 346                         // Free temp link
 347                         free(tmp);
 348
 349                         // Set Path Variable
 350                         if(TruePath) {
 351                                 retLength = strlen(*TruePath);
 352                         }
 353
 354                         continue;
 355                 }
 356
 357                 // Handle Non-Directories
 358                 if( !(curNode->Flags & VFS_FFLAG_DIRECTORY) )
 359                 {
 360                         Warning("VFS_ParsePath - File in directory context");
 361                         if(TruePath)    free(*TruePath);
 362                         LEAVE('n');
 363                         return NULL;
 364                 }
 365
 366                 // Check if path needs extending
 367                 if(!TruePath)   continue;
 368
 369                 // Increase buffer space
 370                 tmp = realloc( *TruePath, retLength + strlen(&Path[ofs]) + 1 + 1 );
 371                 // Check if allocation succeeded
 372                 if(!tmp) {
 373                         Warning("VFS_ParsePath -  Unable to reallocate true path buffer");
 374                         free(*TruePath);
 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                 // - Extend Path
 384                 retLength += nextSlash;
 385         }
 386
 387         // Get last node
 388         LOG("VFS_ParsePath: FindDir(%p, '%s')", curNode, &Path[ofs]);
 389         tmpNode = curNode->FindDir(curNode, &Path[ofs]);
 390         LOG("tmpNode = %p", tmpNode);
 391         if(curNode->Close)      curNode->Close(curNode);
 392         // Check if file was found
 393         if(!tmpNode) {
 394                 LOG("Node '%s' not found in dir '%s'", &Path[ofs], Path);
 395                 //Log("Child fail '%s' ('%s')", Path, &Path[ofs]);
 396                 if(TruePath)    free(*TruePath);
 397                 if(curNode->Close)      curNode->Close(curNode);
 398                 LEAVE('n');
 399                 return NULL;
 400         }
 401
 402         if(TruePath)
 403         {
 404                 // Increase buffer space
 405                 tmp = realloc(*TruePath, retLength + strlen(&Path[ofs]) + 1 + 1);
 406                 // Check if allocation succeeded
 407                 if(!tmp) {
 408                         Warning("VFS_ParsePath -  Unable to reallocate true path buffer");
 409                         free(*TruePath);
 410                         if(tmpNode->Close)      tmpNode->Close(curNode);
 411                         LEAVE('n');
 412                         return NULL;
 413                 }
 414                 *TruePath = tmp;
 415                 // Append to path
 416                 (*TruePath)[retLength] = '/';
 417                 strcpy(*TruePath + retLength + 1, &Path[ofs]);
 418                 // - Extend Path
 419                 //retLength += strlen(tmpNode->Name) + 1;
 420         }
 421
 422         LEAVE('p', tmpNode);
 423         return tmpNode;
 424 }
 425
 426 /**
 427  * \fn int VFS_Open(char *Path, Uint Mode)
 428  * \brief Open a file
 429  */
 430 int VFS_Open(char *Path, Uint Mode)
 431 {
 432         tVFS_Node       *node;
 433         char    *absPath;
 434          int    i;
 435
 436         ENTER("sPath xMode", Path, Mode);
 437
 438         // Get absolute path
 439         absPath = VFS_GetAbsPath(Path);
 440         LOG("absPath = \"%s\"", absPath);
 441         // Parse path and get mount point
 442         node = VFS_ParsePath(absPath, NULL);
 443         // Free generated path
 444         free(absPath);
 445
 446         if(!node) {
 447                 LOG("Cannot find node");
 448                 LEAVE('i', -1);
 449                 return -1;
 450         }
 451
 452         // Check for symlinks
 453         if( !(Mode & VFS_OPENFLAG_NOLINK) && (node->Flags & VFS_FFLAG_SYMLINK) )
 454         {
 455                 if( !node->Read ) {
 456                         Warning("No read method on symlink");
 457                         LEAVE('i', -1);
 458                         return -1;
 459                 }
 460                 absPath = malloc(node->Size+1); // Allocate Buffer
 461                 node->Read( node, 0, node->Size, absPath );     // Read Path
 462
 463                 absPath[ node->Size ] = '\0';   // End String
 464                 if(node->Close) node->Close( node );    // Close old node
 465                 node = VFS_ParsePath(absPath, NULL);    // Get new node
 466                 free( absPath );        // Free allocated path
 467         }
 468
 469         if(!node) {
 470                 LOG("Cannot find node");
 471                 LEAVE('i', -1);
 472                 return -1;
 473         }
 474
 475         i = 0;
 476         i |= (Mode & VFS_OPENFLAG_EXEC) ? VFS_PERM_EXECUTE : 0;
 477         i |= (Mode & VFS_OPENFLAG_READ) ? VFS_PERM_READ : 0;
 478         i |= (Mode & VFS_OPENFLAG_WRITE) ? VFS_PERM_WRITE : 0;
 479
 480         LOG("i = 0b%b", i);
 481
 482         // Permissions Check
 483         if( !VFS_CheckACL(node, i) ) {
 484                 if(node->Close) node->Close( node );
 485                 Log("VFS_Open: Permissions Failed");
 486                 LEAVE('i', -1);
 487                 return -1;
 488         }
 489
 490         // Check for a user open
 491         if(Mode & VFS_OPENFLAG_USER)
 492         {
 493                 // Allocate Buffer
 494                 if( MM_GetPhysAddr( (Uint)gaUserHandles ) == 0 )
 495                 {
 496                         Uint    addr, size;
 497                         size = CFGINT(CFG_VFS_MAXFILES) * sizeof(tVFS_Handle);
 498                         for(addr = 0; addr < size; addr += 0x1000)
 499                                 MM_Allocate( (Uint)gaUserHandles + addr );
 500                         memset( gaUserHandles, 0, size );
 501                 }
 502                 // Get a handle
 503                 for(i=0;i<CFGINT(CFG_VFS_MAXFILES);i++)
 504                 {
 505                         if(gaUserHandles[i].Node)       continue;
 506                         gaUserHandles[i].Node = node;
 507                         gaUserHandles[i].Position = 0;
 508                         gaUserHandles[i].Mode = Mode;
 509                         LEAVE('i', i);
 510                         return i;
 511                 }
 512         }
 513         else
 514         {
 515                 // Allocate space if not already
 516                 if( MM_GetPhysAddr( (Uint)gaKernelHandles ) == 0 )
 517                 {
 518                         Uint    addr, size;
 519                         size = MAX_KERNEL_FILES * sizeof(tVFS_Handle);
 520                         for(addr = 0; addr < size; addr += 0x1000)
 521                                 MM_Allocate( (Uint)gaKernelHandles + addr );
 522                         memset( gaKernelHandles, 0, size );
 523                 }
 524                 // Get a handle
 525                 for(i=0;i<MAX_KERNEL_FILES;i++)
 526                 {
 527                         if(gaKernelHandles[i].Node)     continue;
 528                         gaKernelHandles[i].Node = node;
 529                         gaKernelHandles[i].Position = 0;
 530                         gaKernelHandles[i].Mode = Mode;
 531                         LEAVE('x', i|VFS_KERNEL_FLAG);
 532                         return i|VFS_KERNEL_FLAG;
 533                 }
 534         }
 535
 536         Log("VFS_Open: Out of handles");
 537         LEAVE('i', -1);
 538         return -1;
 539 }
 540
 541
 542 /**
 543  * \brief Open a file from an open directory
 544  */
 545 int VFS_OpenChild(Uint *Errno, int FD, char *Name, Uint Mode)
 546 {
 547         tVFS_Handle     *h;
 548         tVFS_Node       *node;
 549          int    i;
 550
 551         // Get handle
 552         h = VFS_GetHandle(FD);
 553         if(h == NULL) {
 554                 Log_Warning("VFS", "VFS_OpenChild - Invalid file handle 0x%x", FD);
 555                 if(Errno)       *Errno = EINVAL;
 556                 LEAVE('i', -1);
 557                 return -1;
 558         }
 559
 560         // Check for directory
 561         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 562                 Log_Warning("VFS", "VFS_OpenChild - Passed handle is not a directory", FD);
 563                 if(Errno)       *Errno = ENOTDIR;
 564                 LEAVE('i', -1);
 565                 return -1;
 566         }
 567
 568         // Find Child
 569         node = h->Node->FindDir(h->Node, Name);
 570         if(!node) {
 571                 if(Errno)       *Errno = ENOENT;
 572                 LEAVE('i', -1);
 573                 return -1;
 574         }
 575
 576         i = 0;
 577         i |= (Mode & VFS_OPENFLAG_EXEC) ? VFS_PERM_EXECUTE : 0;
 578         i |= (Mode & VFS_OPENFLAG_READ) ? VFS_PERM_READ : 0;
 579         i |= (Mode & VFS_OPENFLAG_WRITE) ? VFS_PERM_WRITE : 0;
 580
 581         // Permissions Check
 582         if( !VFS_CheckACL(node, i) ) {
 583                 if(node->Close) node->Close( node );
 584                 Log_Notice("VFS", "VFS_OpenChild - Permissions Failed");
 585                 if(Errno)       *Errno = EACCES;
 586                 LEAVE('i', -1);
 587                 return -1;
 588         }
 589
 590         // Check for a user open
 591         if(Mode & VFS_OPENFLAG_USER)
 592         {
 593                 // Allocate Buffer
 594                 if( MM_GetPhysAddr( (Uint)gaUserHandles ) == 0 )
 595                 {
 596                         Uint    addr, size;
 597                         size = CFGINT(CFG_VFS_MAXFILES) * sizeof(tVFS_Handle);
 598                         for(addr = 0; addr < size; addr += 0x1000)
 599                                 MM_Allocate( (Uint)gaUserHandles + addr );
 600                         memset( gaUserHandles, 0, size );
 601                 }
 602                 // Get a handle
 603                 for(i=0;i<CFGINT(CFG_VFS_MAXFILES);i++)
 604                 {
 605                         if(gaUserHandles[i].Node)       continue;
 606                         gaUserHandles[i].Node = node;
 607                         gaUserHandles[i].Position = 0;
 608                         gaUserHandles[i].Mode = Mode;
 609                         LEAVE('i', i);
 610                         return i;
 611                 }
 612         }
 613         else
 614         {
 615                 // Allocate space if not already
 616                 if( MM_GetPhysAddr( (Uint)gaKernelHandles ) == 0 )
 617                 {
 618                         Uint    addr, size;
 619                         size = MAX_KERNEL_FILES * sizeof(tVFS_Handle);
 620                         for(addr = 0; addr < size; addr += 0x1000)
 621                                 MM_Allocate( (Uint)gaKernelHandles + addr );
 622                         memset( gaKernelHandles, 0, size );
 623                 }
 624                 // Get a handle
 625                 for(i=0;i<MAX_KERNEL_FILES;i++)
 626                 {
 627                         if(gaKernelHandles[i].Node)     continue;
 628                         gaKernelHandles[i].Node = node;
 629                         gaKernelHandles[i].Position = 0;
 630                         gaKernelHandles[i].Mode = Mode;
 631                         LEAVE('x', i|VFS_KERNEL_FLAG);
 632                         return i|VFS_KERNEL_FLAG;
 633                 }
 634         }
 635
 636         Log_Error("VFS", "VFS_OpenChild - Out of handles");
 637         if(Errno)       *Errno = ENFILE;
 638         LEAVE('i', -1);
 639         return -1;
 640 }
 641
 642 /**
 643  * \fn void VFS_Close(int FD)
 644  * \brief Closes an open file handle
 645  */
 646 void VFS_Close(int FD)
 647 {
 648         tVFS_Handle     *h;
 649
 650         // Get handle
 651         h = VFS_GetHandle(FD);
 652         if(h == NULL) {
 653                 Log_Warning("VFS", "Invalid file handle passed to VFS_Close, 0x%x\n", FD);
 654                 return;
 655         }
 656
 657         #if VALIDATE_VFS_FUNCTIPONS
 658         if(h->Node->Close && !MM_GetPhysAddr(h->Node->Close)) {
 659                 Log_Warning("VFS", "Node %p's ->Close method is invalid (%p)",
 660                         h->Node, h->Node->Close);
 661                 return ;
 662         }
 663         #endif
 664
 665         if(h->Node->Close)
 666                 h->Node->Close( h->Node );
 667
 668         h->Node = NULL;
 669 }
 670
 671 /**
 672  * \brief Change current working directory
 673  */
 674 int VFS_ChDir(char *Dest)
 675 {
 676         char    *buf;
 677          int    fd;
 678         tVFS_Handle     *h;
 679
 680         // Create Absolute
 681         buf = VFS_GetAbsPath(Dest);
 682         if(buf == NULL) {
 683                 Log("VFS_ChDir: Path expansion failed");
 684                 return -1;
 685         }
 686
 687         // Check if path exists
 688         fd = VFS_Open(buf, VFS_OPENFLAG_EXEC);
 689         if(fd == -1) {
 690                 Log("VFS_ChDir: Path is invalid");
 691                 return -1;
 692         }
 693
 694         // Get node so we can check for directory
 695         h = VFS_GetHandle(fd);
 696         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 697                 Log("VFS_ChDir: Path is not a directory");
 698                 VFS_Close(fd);
 699                 return -1;
 700         }
 701
 702         // Close file
 703         VFS_Close(fd);
 704
 705         // Free old working directory
 706         if( CFGPTR(CFG_VFS_CWD) )
 707                 free( CFGPTR(CFG_VFS_CWD) );
 708         // Set new
 709         CFGPTR(CFG_VFS_CWD) = buf;
 710
 711         Log("Updated CWD to '%s'", buf);
 712
 713         return 1;
 714 }
 715
 716 /**
 717  * \fn int VFS_ChRoot(char *New)
 718  * \brief Change current root directory
 719  */
 720 int VFS_ChRoot(char *New)
 721 {
 722         char    *buf;
 723          int    fd;
 724         tVFS_Handle     *h;
 725
 726         if(New[0] == '/' && New[1] == '\0')
 727                 return 1;       // What a useless thing to ask!
 728
 729         // Create Absolute
 730         buf = VFS_GetAbsPath(New);
 731         if(buf == NULL) {
 732                 LOG("Path expansion failed");
 733                 return -1;
 734         }
 735
 736         // Check if path exists
 737         fd = VFS_Open(buf, VFS_OPENFLAG_EXEC);
 738         if(fd == -1) {
 739                 LOG("Path is invalid");
 740                 return -1;
 741         }
 742
 743         // Get node so we can check for directory
 744         h = VFS_GetHandle(fd);
 745         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 746                 LOG("Path is not a directory");
 747                 VFS_Close(fd);
 748                 return -1;
 749         }
 750
 751         // Close file
 752         VFS_Close(fd);
 753
 754         // Free old working directory
 755         if( CFGPTR(CFG_VFS_CHROOT) )
 756                 free( CFGPTR(CFG_VFS_CHROOT) );
 757         // Set new
 758         CFGPTR(CFG_VFS_CHROOT) = buf;
 759
 760         LOG("Updated Root to '%s'", buf);
 761
 762         return 1;
 763 }
 764
 765 /**
 766  * \fn tVFS_Handle *VFS_GetHandle(int FD)
 767  * \brief Gets a pointer to the handle information structure
 768  */
 769 tVFS_Handle *VFS_GetHandle(int FD)
 770 {
 771         tVFS_Handle     *h;
 772
 773         //Log_Debug("VFS", "VFS_GetHandle: (FD=0x%x)", FD);
 774
 775         if(FD < 0)      return NULL;
 776
 777         if(FD & VFS_KERNEL_FLAG) {
 778                 FD &= (VFS_KERNEL_FLAG - 1);
 779                 if(FD >= MAX_KERNEL_FILES)      return NULL;
 780                 h = &gaKernelHandles[ FD ];
 781         } else {
 782                 if(FD >= CFGINT(CFG_VFS_MAXFILES))      return NULL;
 783                 h = &gaUserHandles[ FD ];
 784         }
 785
 786         if(h->Node == NULL)     return NULL;
 787         //Log_Debug("VFS", "VFS_GetHandle: RETURN %p", h);
 788         return h;
 789 }
 790
 791 // === EXPORTS ===
 792 EXPORT(VFS_Open);
 793 EXPORT(VFS_Close);