Kernel/vfs/open.c

   1 /*
   2  * AcessMicro VFS
   3  * - Open, Close and ChDir
   4  */
   5 #define DEBUG   1
   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(const 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
 195         // For root we always fast return
 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 an`ything 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                         if(!curNode->Read) {
 323                                 Warning("VFS_ParsePath - Read of node %p is NULL (%s)",
 324                                         curNode, Path);
 325                                 if(curNode->Close)      curNode->Close(curNode);
 326                                 // No need to free *TruePath, see above
 327                                 LEAVE('n');
 328                                 return NULL;
 329                         }
 330
 331                         tmp = malloc( curNode->Size + 1 );
 332                         if(!tmp) {
 333                                 Log_Warning("VFS", "VFS_ParsePath - Malloc failure");
 334                                 // No need to free *TruePath, see above
 335                                 LEAVE('n');
 336                                 return NULL;
 337                         }
 338                         curNode->Read( curNode, 0, curNode->Size, tmp );
 339                         tmp[ curNode->Size ] = '\0';
 340
 341                         // Parse Symlink Path
 342                         curNode = VFS_ParsePath(tmp, TruePath);
 343                         if(TruePath)
 344                                 LOG("VFS", "*TruePath='%s'", *TruePath);
 345
 346                         // Error Check
 347                         if(!curNode) {
 348                                 Log_Debug("VFS", "Symlink fail '%s'", tmp);
 349                                 free(tmp);      // Free temp string
 350                                 if(TruePath)    free(TruePath);
 351                                 LEAVE('n');
 352                                 return NULL;
 353                         }
 354
 355                         // Free temp link
 356                         free(tmp);
 357
 358                         // Set Path Variable
 359                         if(TruePath) {
 360                                 retLength = strlen(*TruePath);
 361                         }
 362
 363                         continue;
 364                 }
 365
 366                 // Handle Non-Directories
 367                 if( !(curNode->Flags & VFS_FFLAG_DIRECTORY) )
 368                 {
 369                         Warning("VFS_ParsePath - File in directory context");
 370                         if(TruePath)    free(*TruePath);
 371                         LEAVE('n');
 372                         return NULL;
 373                 }
 374
 375                 // Check if path needs extending
 376                 if(!TruePath)   continue;
 377
 378                 // Increase buffer space
 379                 tmp = realloc( *TruePath, retLength + strlen(pathEle) + 1 + 1 );
 380                 // Check if allocation succeeded
 381                 if(!tmp) {
 382                         Warning("VFS_ParsePath -  Unable to reallocate true path buffer");
 383                         free(*TruePath);
 384                         *TruePath = NULL;
 385                         if(curNode->Close)      curNode->Close(curNode);
 386                         LEAVE('n');
 387                         return NULL;
 388                 }
 389                 *TruePath = tmp;
 390                 // Append to path
 391                 (*TruePath)[retLength] = '/';
 392                 strcpy(*TruePath+retLength+1, pathEle);
 393
 394                 LOG("*TruePath = '%s'", *TruePath);
 395
 396                 // - Extend Path
 397                 retLength += nextSlash + 1;
 398         }
 399
 400         if( !curNode->FindDir ) {
 401                 if(curNode->Close)      curNode->Close(curNode);
 402                 if(TruePath) {
 403                         free(*TruePath);
 404                         *TruePath = NULL;
 405                 }
 406                 Log("FindDir fail on '%s'", Path);
 407                 LEAVE('n');
 408                 return NULL;
 409         }
 410
 411         // Get last node
 412         LOG("VFS_ParsePath: FindDir(%p, '%s')", curNode, &Path[ofs]);
 413         tmpNode = curNode->FindDir(curNode, &Path[ofs]);
 414         LOG("tmpNode = %p", tmpNode);
 415         if(curNode->Close)      curNode->Close(curNode);
 416         // Check if file was found
 417         if(!tmpNode) {
 418                 LOG("Node '%s' not found in dir '%s'", &Path[ofs], Path);
 419                 //Log("Child fail '%s' ('%s')", Path, &Path[ofs]);
 420                 if(TruePath)    free(*TruePath);
 421                 if(curNode->Close)      curNode->Close(curNode);
 422                 LEAVE('n');
 423                 return NULL;
 424         }
 425
 426         if(TruePath)
 427         {
 428                 // Increase buffer space
 429                 tmp = realloc(*TruePath, retLength + strlen(&Path[ofs]) + 1 + 1);
 430                 // Check if allocation succeeded
 431                 if(!tmp) {
 432                         Warning("VFS_ParsePath -  Unable to reallocate true path buffer");
 433                         free(*TruePath);
 434                         if(tmpNode->Close)      tmpNode->Close(curNode);
 435                         LEAVE('n');
 436                         return NULL;
 437                 }
 438                 *TruePath = tmp;
 439                 // Append to path
 440                 (*TruePath)[retLength] = '/';
 441                 strcpy(*TruePath + retLength + 1, &Path[ofs]);
 442                 // - Extend Path
 443                 //retLength += strlen(tmpNode->Name) + 1;
 444         }
 445
 446         LEAVE('p', tmpNode);
 447         return tmpNode;
 448 }
 449
 450 /**
 451  * \fn int VFS_Open(char *Path, Uint Mode)
 452  * \brief Open a file
 453  */
 454 int VFS_Open(char *Path, Uint Mode)
 455 {
 456         tVFS_Node       *node;
 457         char    *absPath;
 458          int    i;
 459
 460         ENTER("sPath xMode", Path, Mode);
 461
 462         // Get absolute path
 463         absPath = VFS_GetAbsPath(Path);
 464         LOG("absPath = \"%s\"", absPath);
 465         // Parse path and get mount point
 466         node = VFS_ParsePath(absPath, NULL);
 467         // Free generated path
 468         free(absPath);
 469
 470         if(!node) {
 471                 LOG("Cannot find node");
 472                 LEAVE('i', -1);
 473                 return -1;
 474         }
 475
 476         // Check for symlinks
 477         if( !(Mode & VFS_OPENFLAG_NOLINK) && (node->Flags & VFS_FFLAG_SYMLINK) )
 478         {
 479                 if( !node->Read ) {
 480                         Warning("No read method on symlink");
 481                         LEAVE('i', -1);
 482                         return -1;
 483                 }
 484                 absPath = malloc(node->Size+1); // Allocate Buffer
 485                 node->Read( node, 0, node->Size, absPath );     // Read Path
 486
 487                 absPath[ node->Size ] = '\0';   // End String
 488                 if(node->Close) node->Close( node );    // Close old node
 489                 node = VFS_ParsePath(absPath, NULL);    // Get new node
 490                 free( absPath );        // Free allocated path
 491         }
 492
 493         if(!node) {
 494                 LOG("Cannot find node");
 495                 LEAVE('i', -1);
 496                 return -1;
 497         }
 498
 499         i = 0;
 500         i |= (Mode & VFS_OPENFLAG_EXEC) ? VFS_PERM_EXECUTE : 0;
 501         i |= (Mode & VFS_OPENFLAG_READ) ? VFS_PERM_READ : 0;
 502         i |= (Mode & VFS_OPENFLAG_WRITE) ? VFS_PERM_WRITE : 0;
 503
 504         LOG("i = 0b%b", i);
 505
 506         // Permissions Check
 507         if( !VFS_CheckACL(node, i) ) {
 508                 if(node->Close) node->Close( node );
 509                 Log("VFS_Open: Permissions Failed");
 510                 LEAVE('i', -1);
 511                 return -1;
 512         }
 513
 514         // Check for a user open
 515         if(Mode & VFS_OPENFLAG_USER)
 516         {
 517                 // Allocate Buffer
 518                 if( MM_GetPhysAddr( (Uint)gaUserHandles ) == 0 )
 519                 {
 520                         Uint    addr, size;
 521                         size = CFGINT(CFG_VFS_MAXFILES) * sizeof(tVFS_Handle);
 522                         for(addr = 0; addr < size; addr += 0x1000)
 523                                 MM_Allocate( (Uint)gaUserHandles + addr );
 524                         memset( gaUserHandles, 0, size );
 525                 }
 526                 // Get a handle
 527                 for(i=0;i<CFGINT(CFG_VFS_MAXFILES);i++)
 528                 {
 529                         if(gaUserHandles[i].Node)       continue;
 530                         gaUserHandles[i].Node = node;
 531                         gaUserHandles[i].Position = 0;
 532                         gaUserHandles[i].Mode = Mode;
 533                         LEAVE('i', i);
 534                         return i;
 535                 }
 536         }
 537         else
 538         {
 539                 // Allocate space if not already
 540                 if( MM_GetPhysAddr( (Uint)gaKernelHandles ) == 0 )
 541                 {
 542                         Uint    addr, size;
 543                         size = MAX_KERNEL_FILES * sizeof(tVFS_Handle);
 544                         for(addr = 0; addr < size; addr += 0x1000)
 545                                 MM_Allocate( (Uint)gaKernelHandles + addr );
 546                         memset( gaKernelHandles, 0, size );
 547                 }
 548                 // Get a handle
 549                 for(i=0;i<MAX_KERNEL_FILES;i++)
 550                 {
 551                         if(gaKernelHandles[i].Node)     continue;
 552                         gaKernelHandles[i].Node = node;
 553                         gaKernelHandles[i].Position = 0;
 554                         gaKernelHandles[i].Mode = Mode;
 555                         LEAVE('x', i|VFS_KERNEL_FLAG);
 556                         return i|VFS_KERNEL_FLAG;
 557                 }
 558         }
 559
 560         Log("VFS_Open: Out of handles");
 561         LEAVE('i', -1);
 562         return -1;
 563 }
 564
 565
 566 /**
 567  * \brief Open a file from an open directory
 568  */
 569 int VFS_OpenChild(Uint *Errno, int FD, char *Name, Uint Mode)
 570 {
 571         tVFS_Handle     *h;
 572         tVFS_Node       *node;
 573          int    i;
 574
 575         // Get handle
 576         h = VFS_GetHandle(FD);
 577         if(h == NULL) {
 578                 Log_Warning("VFS", "VFS_OpenChild - Invalid file handle 0x%x", FD);
 579                 if(Errno)       *Errno = EINVAL;
 580                 LEAVE('i', -1);
 581                 return -1;
 582         }
 583
 584         // Check for directory
 585         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 586                 Log_Warning("VFS", "VFS_OpenChild - Passed handle is not a directory", FD);
 587                 if(Errno)       *Errno = ENOTDIR;
 588                 LEAVE('i', -1);
 589                 return -1;
 590         }
 591
 592         // Find Child
 593         node = h->Node->FindDir(h->Node, Name);
 594         if(!node) {
 595                 if(Errno)       *Errno = ENOENT;
 596                 LEAVE('i', -1);
 597                 return -1;
 598         }
 599
 600         i = 0;
 601         i |= (Mode & VFS_OPENFLAG_EXEC) ? VFS_PERM_EXECUTE : 0;
 602         i |= (Mode & VFS_OPENFLAG_READ) ? VFS_PERM_READ : 0;
 603         i |= (Mode & VFS_OPENFLAG_WRITE) ? VFS_PERM_WRITE : 0;
 604
 605         // Permissions Check
 606         if( !VFS_CheckACL(node, i) ) {
 607                 if(node->Close) node->Close( node );
 608                 Log_Notice("VFS", "VFS_OpenChild - Permissions Failed");
 609                 if(Errno)       *Errno = EACCES;
 610                 LEAVE('i', -1);
 611                 return -1;
 612         }
 613
 614         // Check for a user open
 615         if(Mode & VFS_OPENFLAG_USER)
 616         {
 617                 // Allocate Buffer
 618                 if( MM_GetPhysAddr( (Uint)gaUserHandles ) == 0 )
 619                 {
 620                         Uint    addr, size;
 621                         size = CFGINT(CFG_VFS_MAXFILES) * sizeof(tVFS_Handle);
 622                         for(addr = 0; addr < size; addr += 0x1000)
 623                                 MM_Allocate( (Uint)gaUserHandles + addr );
 624                         memset( gaUserHandles, 0, size );
 625                 }
 626                 // Get a handle
 627                 for(i=0;i<CFGINT(CFG_VFS_MAXFILES);i++)
 628                 {
 629                         if(gaUserHandles[i].Node)       continue;
 630                         gaUserHandles[i].Node = node;
 631                         gaUserHandles[i].Position = 0;
 632                         gaUserHandles[i].Mode = Mode;
 633                         LEAVE('i', i);
 634                         return i;
 635                 }
 636         }
 637         else
 638         {
 639                 // Allocate space if not already
 640                 if( MM_GetPhysAddr( (Uint)gaKernelHandles ) == 0 )
 641                 {
 642                         Uint    addr, size;
 643                         size = MAX_KERNEL_FILES * sizeof(tVFS_Handle);
 644                         for(addr = 0; addr < size; addr += 0x1000)
 645                                 MM_Allocate( (Uint)gaKernelHandles + addr );
 646                         memset( gaKernelHandles, 0, size );
 647                 }
 648                 // Get a handle
 649                 for(i=0;i<MAX_KERNEL_FILES;i++)
 650                 {
 651                         if(gaKernelHandles[i].Node)     continue;
 652                         gaKernelHandles[i].Node = node;
 653                         gaKernelHandles[i].Position = 0;
 654                         gaKernelHandles[i].Mode = Mode;
 655                         LEAVE('x', i|VFS_KERNEL_FLAG);
 656                         return i|VFS_KERNEL_FLAG;
 657                 }
 658         }
 659
 660         Log_Error("VFS", "VFS_OpenChild - Out of handles");
 661         if(Errno)       *Errno = ENFILE;
 662         LEAVE('i', -1);
 663         return -1;
 664 }
 665
 666 /**
 667  * \fn void VFS_Close(int FD)
 668  * \brief Closes an open file handle
 669  */
 670 void VFS_Close(int FD)
 671 {
 672         tVFS_Handle     *h;
 673
 674         // Get handle
 675         h = VFS_GetHandle(FD);
 676         if(h == NULL) {
 677                 Log_Warning("VFS", "Invalid file handle passed to VFS_Close, 0x%x\n", FD);
 678                 return;
 679         }
 680
 681         #if VALIDATE_VFS_FUNCTIPONS
 682         if(h->Node->Close && !MM_GetPhysAddr(h->Node->Close)) {
 683                 Log_Warning("VFS", "Node %p's ->Close method is invalid (%p)",
 684                         h->Node, h->Node->Close);
 685                 return ;
 686         }
 687         #endif
 688
 689         if(h->Node->Close)
 690                 h->Node->Close( h->Node );
 691
 692         h->Node = NULL;
 693 }
 694
 695 /**
 696  * \brief Change current working directory
 697  */
 698 int VFS_ChDir(char *Dest)
 699 {
 700         char    *buf;
 701          int    fd;
 702         tVFS_Handle     *h;
 703
 704         // Create Absolute
 705         buf = VFS_GetAbsPath(Dest);
 706         if(buf == NULL) {
 707                 Log("VFS_ChDir: Path expansion failed");
 708                 return -1;
 709         }
 710
 711         // Check if path exists
 712         fd = VFS_Open(buf, VFS_OPENFLAG_EXEC);
 713         if(fd == -1) {
 714                 Log("VFS_ChDir: Path is invalid");
 715                 return -1;
 716         }
 717
 718         // Get node so we can check for directory
 719         h = VFS_GetHandle(fd);
 720         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 721                 Log("VFS_ChDir: Path is not a directory");
 722                 VFS_Close(fd);
 723                 return -1;
 724         }
 725
 726         // Close file
 727         VFS_Close(fd);
 728
 729         // Free old working directory
 730         if( CFGPTR(CFG_VFS_CWD) )
 731                 free( CFGPTR(CFG_VFS_CWD) );
 732         // Set new
 733         CFGPTR(CFG_VFS_CWD) = buf;
 734
 735         Log("Updated CWD to '%s'", buf);
 736
 737         return 1;
 738 }
 739
 740 /**
 741  * \fn int VFS_ChRoot(char *New)
 742  * \brief Change current root directory
 743  */
 744 int VFS_ChRoot(char *New)
 745 {
 746         char    *buf;
 747          int    fd;
 748         tVFS_Handle     *h;
 749
 750         if(New[0] == '/' && New[1] == '\0')
 751                 return 1;       // What a useless thing to ask!
 752
 753         // Create Absolute
 754         buf = VFS_GetAbsPath(New);
 755         if(buf == NULL) {
 756                 LOG("Path expansion failed");
 757                 return -1;
 758         }
 759
 760         // Check if path exists
 761         fd = VFS_Open(buf, VFS_OPENFLAG_EXEC);
 762         if(fd == -1) {
 763                 LOG("Path is invalid");
 764                 return -1;
 765         }
 766
 767         // Get node so we can check for directory
 768         h = VFS_GetHandle(fd);
 769         if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
 770                 LOG("Path is not a directory");
 771                 VFS_Close(fd);
 772                 return -1;
 773         }
 774
 775         // Close file
 776         VFS_Close(fd);
 777
 778         // Free old working directory
 779         if( CFGPTR(CFG_VFS_CHROOT) )
 780                 free( CFGPTR(CFG_VFS_CHROOT) );
 781         // Set new
 782         CFGPTR(CFG_VFS_CHROOT) = buf;
 783
 784         LOG("Updated Root to '%s'", buf);
 785
 786         return 1;
 787 }
 788
 789 /**
 790  * \fn tVFS_Handle *VFS_GetHandle(int FD)
 791  * \brief Gets a pointer to the handle information structure
 792  */
 793 tVFS_Handle *VFS_GetHandle(int FD)
 794 {
 795         tVFS_Handle     *h;
 796
 797         //Log_Debug("VFS", "VFS_GetHandle: (FD=0x%x)", FD);
 798
 799         if(FD < 0)      return NULL;
 800
 801         if(FD & VFS_KERNEL_FLAG) {
 802                 FD &= (VFS_KERNEL_FLAG - 1);
 803                 if(FD >= MAX_KERNEL_FILES)      return NULL;
 804                 h = &gaKernelHandles[ FD ];
 805         } else {
 806                 if(FD >= CFGINT(CFG_VFS_MAXFILES))      return NULL;
 807                 h = &gaUserHandles[ FD ];
 808         }
 809
 810         if(h->Node == NULL)     return NULL;
 811         //Log_Debug("VFS", "VFS_GetHandle: RETURN %p", h);
 812         return h;
 813 }
 814
 815 // === EXPORTS ===
 816 EXPORT(VFS_Open);
 817 EXPORT(VFS_Close);