* - Open, Close and ChDir
*/
#define DEBUG 0
-#include <common.h>
+#include <acess.h>
#include "vfs.h"
#include "vfs_int.h"
#include "vfs_ext.h"
// === IMPORTS ===
extern tVFS_Node gVFS_MemRoot;
-extern tVFS_Mount *gRootMount;
+extern tVFS_Mount *gVFS_RootMount;
// === GLOBALS ===
tVFS_Handle *gaUserHandles = (void*)MM_PPD_VFS;
{
char *ret;
int pathLen = strlen(Path);
- int read, write;
- int pos, endLen;
- int slashNum = 0;
- Uint slashOffsets[MAX_PATH_SLASHES];
+ char *pathComps[MAX_PATH_SLASHES];
+ char *tmpStr;
+ int iPos = 0;
+ int iPos2 = 0;
+ char *chroot = CFGPTR(CFG_VFS_CHROOT);
+ int chrootLen;
char *cwd = CFGPTR(CFG_VFS_CWD);
int cwdLen;
return ret;
}
+ // - Fetch ChRoot
+ if( chroot == NULL ) {
+ chroot = "";
+ chrootLen = 0;
+ } else {
+ chrootLen = strlen(chroot);
+ }
+
// Check if the path is already absolute
if(Path[0] == '/') {
- endLen = pathLen + 1;
ret = malloc(pathLen + 1);
if(!ret) {
Warning("VFS_GetAbsPath - malloc() returned NULL");
}
strcpy(ret, Path);
} else {
- cwdLen = strlen(cwd);
- endLen = cwdLen + pathLen + 2;
+ if(cwd == NULL) {
+ cwd = "/";
+ cwdLen = 1;
+ }
+ else {
+ cwdLen = strlen(cwd);
+ }
// Prepend the current directory
- ret = malloc(endLen);
+ ret = malloc( cwdLen + 1 + pathLen + 1 );
strcpy(ret, cwd);
ret[cwdLen] = '/';
strcpy(&ret[cwdLen+1], Path);
+ //Log("ret = '%s'\n", ret);
}
- // Remove . and ..
- read = write = 1; // Cwd has already been parsed
- for(; read < endLen; read = pos+1)
+ // Parse Path
+ pathComps[iPos++] = tmpStr = ret+1;
+ while(*tmpStr)
{
- pos = strpos( &ret[read], '/' );
- // If we are in the last section, force a break at the end of the itteration
- if(pos == -1) pos = endLen;
- else pos += read; // Else, Adjust to absolute
-
- // Check Length
- if(pos - read <= 2)
+ if(*tmpStr++ == '/')
{
- // Current Dir "."
- if(strncmp(&ret[read], ".", pos-read) == 0) continue;
- // Parent ".."
- if(strncmp(&ret[read], "..", pos-read) == 0)
- {
- // If there is no higher, silently ignore
- if(slashNum < 1) {
- write = 1;
- continue;
- }
- // Reverse write pointer
- write = slashOffsets[ --slashNum ];
- continue;
+ pathComps[iPos++] = tmpStr;
+ if(iPos == MAX_PATH_SLASHES) {
+ LOG("Path '%s' has too many elements", Path);
+ free(ret);
+ LEAVE('n');
+ return NULL;
}
}
-
-
- // Only copy if the positions differ
- if(read != write) {
- //Log("write = %i, read = %i, pos-read+1 = %i", write, read, pos-read+1);
- memcpy( &ret[write], &ret[read], pos-read+1 );
- //Log("ret = '%s'", ret);
+ }
+ pathComps[iPos] = NULL;
+
+ // Cleanup
+ iPos2 = iPos = 0;
+ while(pathComps[iPos])
+ {
+ tmpStr = pathComps[iPos];
+ // Always Increment iPos
+ iPos++;
+ // ..
+ if(tmpStr[0] == '.' && tmpStr[1] == '.' && (tmpStr[2] == '/' || tmpStr[2] == '\0') )
+ {
+ if(iPos2 != 0)
+ iPos2 --;
+ continue;
}
-
- if(slashNum < MAX_PATH_SLASHES)
- slashOffsets[ slashNum++ ] = write;
- else {
- LOG("Path '%s' has too many elements", Path);
- free(ret);
- LEAVE('n');
- return NULL;
+ // .
+ if(tmpStr[0] == '.' && (tmpStr[1] == '/' || tmpStr[1] == '\0') )
+ {
+ continue;
+ }
+ // Empty
+ if(tmpStr[0] == '/' || tmpStr[0] == '\0')
+ {
+ continue;
}
- // Increment write pointer
- write += (pos-read)+1;
+ // Set New Position
+ pathComps[iPos2] = tmpStr;
+ iPos2++;
}
+ pathComps[iPos2] = NULL;
+
+ // Build New Path
+ iPos2 = 1; iPos = 0;
+ ret[0] = '/';
+ while(pathComps[iPos])
+ {
+ tmpStr = pathComps[iPos];
+ while(*tmpStr && *tmpStr != '/')
+ {
+ ret[iPos2++] = *tmpStr;
+ tmpStr++;
+ }
+ ret[iPos2++] = '/';
+ iPos++;
+ }
+ if(iPos2 > 1)
+ ret[iPos2-1] = 0;
+ else
+ ret[iPos2] = 0;
+
+
+ // Prepend the chroot
+ tmpStr = malloc(chrootLen + strlen(ret) + 1);
+ strcpy( tmpStr, chroot );
+ strcpy( tmpStr+chrootLen, ret );
+ free(ret);
+ ret = tmpStr;
- // `ret` should now be the absolute path
LEAVE('s', ret);
//Log("VFS_GetAbsPath: RETURN '%s'", ret);
return ret;
tVFS_Node *VFS_ParsePath(char *Path, char **TruePath)
{
tVFS_Mount *mnt;
- tVFS_Mount *longestMount = gRootMount; // Root is first
+ tVFS_Mount *longestMount = gVFS_RootMount; // Root is first
int cmp, retLength = 0;
int ofs, nextSlash;
tVFS_Node *curNode, *tmpNode;
if(Path[0] == '/' && Path[1] == '\0') {
if(TruePath) {
- *TruePath = malloc( gRootMount->MountPointLen+1 );
- strcpy(*TruePath, gRootMount->MountPoint);
+ *TruePath = malloc( gVFS_RootMount->MountPointLen+1 );
+ strcpy(*TruePath, gVFS_RootMount->MountPoint);
}
- LEAVE('p', gRootMount->RootNode);
- return gRootMount->RootNode;
+ LEAVE('p', gVFS_RootMount->RootNode);
+ return gVFS_RootMount->RootNode;
}
// Check if there is anything mounted
- if(!gMounts) return NULL;
+ if(!gVFS_Mounts) {
+ Warning("WTF! There's nothing mounted?");
+ return NULL;
+ }
// Find Mountpoint
- for(mnt = gMounts;
+ for(mnt = gVFS_Mounts;
mnt;
mnt = mnt->Next)
{
// Sanity Check
/*if(!longestMount) {
- Log("VFS_GetTruePath - ERROR: No Root Node\n");
+ Log("VFS_ParsePath - ERROR: No Root Node\n");
return NULL;
}*/
// Check permissions on root of filesystem
if( !VFS_CheckACL(curNode, VFS_PERM_EXECUTE) ) {
- curNode->Close( curNode );
+ if(curNode->Close) curNode->Close( curNode );
if(TruePath) {
free(*TruePath);
*TruePath = NULL;
}
+ //Log("Permissions fail on '%s'", Path);
LEAVE('n');
return NULL;
}
// Check if the node has a FindDir method
- if(!curNode->FindDir) {
+ if( !curNode->FindDir )
+ {
if(curNode->Close) curNode->Close(curNode);
if(TruePath) {
free(*TruePath);
*TruePath = NULL;
}
Path[nextSlash] = '/';
+ //Log("FindDir fail on '%s'", Path);
LEAVE('n');
return NULL;
}
// Get Child Node
tmpNode = curNode->FindDir(curNode, &Path[ofs]);
LOG("tmpNode = %p", tmpNode);
- if(curNode->Close)
- curNode->Close(curNode);
+ if(curNode->Close) curNode->Close(curNode);
curNode = tmpNode;
// Error Check
free(*TruePath);
*TruePath = NULL;
}
+ //Log("Child fail on '%s' ('%s)", Path, &Path[ofs]);
Path[nextSlash] = '/';
LEAVE('n');
return NULL;
*TruePath = NULL;
}
tmp = malloc( curNode->Size + 1 );
+ if(!curNode->Read) {
+ Warning("VFS_ParsePath - Read of node %p is NULL (%s)",
+ curNode, Path);
+ if(curNode->Close) curNode->Close(curNode);
+ LEAVE('n');
+ return NULL;
+ }
curNode->Read( curNode, 0, curNode->Size, tmp );
tmp[ curNode->Size ] = '\0';
// Error Check
if(!curNode) {
+ Log("Symlink fail '%s'", tmp);
free(tmp); // Free temp string
LEAVE('n');
return NULL;
// Check if file was found
if(!tmpNode) {
LOG("Node '%s' not found in dir '%s'", &Path[ofs], Path);
+ //Log("Child fail '%s' ('%s')", Path, &Path[ofs]);
if(TruePath) free(*TruePath);
if(curNode->Close) curNode->Close(curNode);
LEAVE('n');
}
if(!node) {
+ LOG("Cannot find node");
LEAVE('i', -1);
return -1;
}
// Permissions Check
if( !VFS_CheckACL(node, i) ) {
- node->Close( node );
+ if(node->Close) node->Close( node );
+ Log("VFS_Open: Permissions Failed");
LEAVE('i', -1);
return -1;
}
}
}
+ Log("VFS_Open: Out of handles");
+ LEAVE('i', -1);
+ return -1;
+}
+
+
+/**
+ * \brief Open a file from an open directory
+ */
+int VFS_OpenChild(Uint *Errno, int FD, char *Name, Uint Mode)
+{
+ tVFS_Handle *h;
+ tVFS_Node *node;
+ int i;
+
+ // Get handle
+ h = VFS_GetHandle(FD);
+ if(h == NULL) {
+ Log_Warning("VFS", "VFS_OpenChild - Invalid file handle 0x%x", FD);
+ if(Errno) *Errno = EINVAL;
+ LEAVE('i', -1);
+ return -1;
+ }
+
+ // Check for directory
+ if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
+ Log_Warning("VFS", "VFS_OpenChild - Passed handle is not a directory", FD);
+ if(Errno) *Errno = ENOTDIR;
+ LEAVE('i', -1);
+ return -1;
+ }
+
+ // Find Child
+ node = h->Node->FindDir(h->Node, Name);
+ if(!node) {
+ if(Errno) *Errno = ENOENT;
+ LEAVE('i', -1);
+ return -1;
+ }
+
+ i = 0;
+ i |= (Mode & VFS_OPENFLAG_EXEC) ? VFS_PERM_EXECUTE : 0;
+ i |= (Mode & VFS_OPENFLAG_READ) ? VFS_PERM_READ : 0;
+ i |= (Mode & VFS_OPENFLAG_WRITE) ? VFS_PERM_WRITE : 0;
+
+ // Permissions Check
+ if( !VFS_CheckACL(node, i) ) {
+ if(node->Close) node->Close( node );
+ Log_Notice("VFS", "VFS_OpenChild - Permissions Failed");
+ if(Errno) *Errno = EACCES;
+ LEAVE('i', -1);
+ return -1;
+ }
+
+ // Check for a user open
+ if(Mode & VFS_OPENFLAG_USER)
+ {
+ // Allocate Buffer
+ if( MM_GetPhysAddr( (Uint)gaUserHandles ) == 0 )
+ {
+ Uint addr, size;
+ size = CFGINT(CFG_VFS_MAXFILES) * sizeof(tVFS_Handle);
+ for(addr = 0; addr < size; addr += 0x1000)
+ MM_Allocate( (Uint)gaUserHandles + addr );
+ memset( gaUserHandles, 0, size );
+ }
+ // Get a handle
+ for(i=0;i<CFGINT(CFG_VFS_MAXFILES);i++)
+ {
+ if(gaUserHandles[i].Node) continue;
+ gaUserHandles[i].Node = node;
+ gaUserHandles[i].Position = 0;
+ gaUserHandles[i].Mode = Mode;
+ LEAVE('i', i);
+ return i;
+ }
+ }
+ else
+ {
+ // Allocate space if not already
+ if( MM_GetPhysAddr( (Uint)gaKernelHandles ) == 0 )
+ {
+ Uint addr, size;
+ size = MAX_KERNEL_FILES * sizeof(tVFS_Handle);
+ for(addr = 0; addr < size; addr += 0x1000)
+ MM_Allocate( (Uint)gaKernelHandles + addr );
+ memset( gaKernelHandles, 0, size );
+ }
+ // Get a handle
+ for(i=0;i<MAX_KERNEL_FILES;i++)
+ {
+ if(gaKernelHandles[i].Node) continue;
+ gaKernelHandles[i].Node = node;
+ gaKernelHandles[i].Position = 0;
+ gaKernelHandles[i].Mode = Mode;
+ LEAVE('x', i|VFS_KERNEL_FLAG);
+ return i|VFS_KERNEL_FLAG;
+ }
+ }
+
+ Log_Error("VFS", "VFS_OpenChild - Out of handles");
+ if(Errno) *Errno = ENFILE;
LEAVE('i', -1);
return -1;
}
// Get handle
h = VFS_GetHandle(FD);
if(h == NULL) {
- Warning("Invalid file handle passed to VFS_Close, 0x%x\n", FD);
+ Log_Warning("VFS", "Invalid file handle passed to VFS_Close, 0x%x\n", FD);
return;
}
}
/**
- * \fn int VFS_ChDir(char *New)
* \brief Change current working directory
*/
-int VFS_ChDir(char *New)
+int VFS_ChDir(char *Dest)
{
char *buf;
int fd;
tVFS_Handle *h;
// Create Absolute
- buf = VFS_GetAbsPath(New);
+ buf = VFS_GetAbsPath(Dest);
if(buf == NULL) {
Log("VFS_ChDir: Path expansion failed");
return -1;
VFS_Close(fd);
// Free old working directory
- if( CFGPTR(CFG_VFS_CWD) ) free( CFGPTR(CFG_VFS_CWD) );
+ if( CFGPTR(CFG_VFS_CWD) )
+ free( CFGPTR(CFG_VFS_CWD) );
// Set new
CFGPTR(CFG_VFS_CWD) = buf;
return 1;
}
+/**
+ * \fn int VFS_ChRoot(char *New)
+ * \brief Change current root directory
+ */
+int VFS_ChRoot(char *New)
+{
+ char *buf;
+ int fd;
+ tVFS_Handle *h;
+
+ if(New[0] == '/' && New[1] == '\0')
+ return 1; // What a useless thing to ask!
+
+ // Create Absolute
+ buf = VFS_GetAbsPath(New);
+ if(buf == NULL) {
+ LOG("Path expansion failed");
+ return -1;
+ }
+
+ // Check if path exists
+ fd = VFS_Open(buf, VFS_OPENFLAG_EXEC);
+ if(fd == -1) {
+ LOG("Path is invalid");
+ return -1;
+ }
+
+ // Get node so we can check for directory
+ h = VFS_GetHandle(fd);
+ if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
+ LOG("Path is not a directory");
+ VFS_Close(fd);
+ return -1;
+ }
+
+ // Close file
+ VFS_Close(fd);
+
+ // Free old working directory
+ if( CFGPTR(CFG_VFS_CHROOT) )
+ free( CFGPTR(CFG_VFS_CHROOT) );
+ // Set new
+ CFGPTR(CFG_VFS_CHROOT) = buf;
+
+ LOG("Updated Root to '%s'", buf);
+
+ return 1;
+}
+
/**
* \fn tVFS_Handle *VFS_GetHandle(int FD)
* \brief Gets a pointer to the handle information structure
if(h->Node == NULL) return NULL;
return h;
}
+
+// === EXPORTS ===
+EXPORT(VFS_Open);
+EXPORT(VFS_Close);
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