private unsafe static void InternalCreateDirectory(String fullPath, String path, Object dirSecurityObj)
{
#if FEATURE_MACL
DirectorySecurity dirSecurity = (DirectorySecurity)dirSecurityObj;
#endif // FEATURE_MACL
int length = fullPath.Length;
// We need to trim the trailing slash or the code will try to create 2 directories of the same name.
if (length >= 2 && Path.IsDirectorySeparator(fullPath[length - 1]))
{
length--;
}
int lengthRoot = LongPath.GetRootLength(fullPath);
// For UNC paths that are only // or ///
if (length == 2 && Path.IsDirectorySeparator(fullPath[1]))
{
throw new IOException(Environment.GetResourceString("IO.IO_CannotCreateDirectory", path));
}
List <string> stackDir = new List <string>();
// Attempt to figure out which directories don't exist, and only
// create the ones we need. Note that InternalExists may fail due
// to Win32 ACL's preventing us from seeing a directory, and this
// isn't threadsafe.
bool somepathexists = false;
if (length > lengthRoot)
{ // Special case root (fullpath = X:\\)
int i = length - 1;
while (i >= lengthRoot && !somepathexists)
{
String dir = fullPath.Substring(0, i + 1);
if (!InternalExists(dir)) // Create only the ones missing
{
stackDir.Add(dir);
}
else
{
somepathexists = true;
}
while (i > lengthRoot && fullPath[i] != Path.DirectorySeparatorChar && fullPath[i] != Path.AltDirectorySeparatorChar)
{
i--;
}
i--;
}
}
int count = stackDir.Count;
if (stackDir.Count != 0
#if FEATURE_CAS_POLICY
// All demands in full trust domains are no-ops, so skip
//
// The full path went through validity checks by being passed through FileIOPermissions already.
// As a sub string of the full path can't fail the checks if the full path passes.
&& !CodeAccessSecurityEngine.QuickCheckForAllDemands()
#endif
)
{
String[] securityList = new String[stackDir.Count];
stackDir.CopyTo(securityList, 0);
for (int j = 0; j < securityList.Length; j++)
{
securityList[j] += "\\."; // leaf will never have a slash at the end
}
// Security check for all directories not present only.
#if !FEATURE_PAL && FEATURE_MACL
AccessControlActions control = (dirSecurity == null) ? AccessControlActions.None : AccessControlActions.Change;
FileIOPermission.QuickDemand(FileIOPermissionAccess.Write, control, securityList, false, false);
#else
FileIOPermission.QuickDemand(FileIOPermissionAccess.Write, securityList, false, false);
#endif
}
// If we were passed a DirectorySecurity, convert it to a security
// descriptor and set it in he call to CreateDirectory.
Win32Native.SECURITY_ATTRIBUTES secAttrs = null;
#if FEATURE_MACL
if (dirSecurity != null)
{
secAttrs = new Win32Native.SECURITY_ATTRIBUTES();
secAttrs.nLength = (int)Marshal.SizeOf(secAttrs);
// For ACL's, get the security descriptor from the FileSecurity.
byte[] sd = dirSecurity.GetSecurityDescriptorBinaryForm();
byte * bytesOnStack = stackalloc byte[sd.Length];
Buffer.Memcpy(bytesOnStack, 0, sd, 0, sd.Length);
secAttrs.pSecurityDescriptor = bytesOnStack;
}
#endif
bool r = true;
int firstError = 0;
String errorString = path;
// If all the security checks succeeded create all the directories
while (stackDir.Count > 0)
{
String name = stackDir[stackDir.Count - 1];
stackDir.RemoveAt(stackDir.Count - 1);
if (name.Length >= Path.MaxLongPath)
{
throw new PathTooLongException(Environment.GetResourceString("IO.PathTooLong"));
}
r = Win32Native.CreateDirectory(PathInternal.EnsureExtendedPrefix(name), secAttrs);
if (!r && (firstError == 0))
{
int currentError = Marshal.GetLastWin32Error();
// While we tried to avoid creating directories that don't
// exist above, there are at least two cases that will
// cause us to see ERROR_ALREADY_EXISTS here. InternalExists
// can fail because we didn't have permission to the
// directory. Secondly, another thread or process could
// create the directory between the time we check and the
// time we try using the directory. Thirdly, it could
// fail because the target does exist, but is a file.
if (currentError != Win32Native.ERROR_ALREADY_EXISTS)
{
firstError = currentError;
}
else
{
// If there's a file in this directory's place, or if we have ERROR_ACCESS_DENIED when checking if the directory already exists throw.
if (LongPathFile.InternalExists(name) || (!InternalExists(name, out currentError) && currentError == Win32Native.ERROR_ACCESS_DENIED))
{
firstError = currentError;
// Give the user a nice error message, but don't leak path information.
try
{
FileIOPermission.QuickDemand(FileIOPermissionAccess.PathDiscovery, GetDemandDir(name, true), false, false);
errorString = name;
}
catch (SecurityException) { }
}
}
}
}
// We need this check to mask OS differences
// Handle CreateDirectory("X:\\foo") when X: doesn't exist. Similarly for n/w paths.
if ((count == 0) && !somepathexists)
{
String root = InternalGetDirectoryRoot(fullPath);
if (!InternalExists(root))
{
// Extract the root from the passed in path again for security.
__Error.WinIOError(Win32Native.ERROR_PATH_NOT_FOUND, InternalGetDirectoryRoot(path));
}
return;
}
// Only throw an exception if creating the exact directory we
// wanted failed to work correctly.
if (!r && (firstError != 0))
{
__Error.WinIOError(firstError, errorString);
}
}
