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dll: fuse: reparse point testing

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This commit is contained in:
Bill Zissimopoulos 2016-09-13 13:41:09 -07:00
parent eca93bbdb3
commit 2d3d92fb2d
1 changed files with 5 additions and 87 deletions
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92
src/dll/fuse/fuse_intf.c
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@ -485,7 +485,7 @@ static NTSTATUS fsp_fuse_intf_GetReparsePointSymlink(FSP_FILE_SYSTEM *FileSystem
struct fuse *f = FileSystem->UserContext;
char PosixTargetPath[FSP_FSCTL_TRANSACT_PATH_SIZEMAX / sizeof(WCHAR)];
PWSTR TargetPath = 0;
ULONG Length;
ULONG TargetPathLength;
int err;
NTSTATUS Result;
@ -510,102 +510,20 @@ static NTSTATUS fsp_fuse_intf_GetReparsePointSymlink(FSP_FILE_SYSTEM *FileSystem
Result = STATUS_ACCESS_DENIED;
goto exit;
}
/*
* Transform absolute path to relative.
*/
const char *p, *t, *pstem, *tstem;
unsigned index, count;
p = pstem = PosixPath;
t = tstem = PosixTargetPath;
/* skip common prefix */
for (;;)
{
while ('/' == *p)
p++;
while ('/' == *t)
t++;
pstem = p, tstem = t;
while ('/' != *p)
{
if (*p != *t)
goto common_prefix_end;
else if ('\0' == *p)
{
while ('/' == *t)
t++;
pstem = p, tstem = t;
goto common_prefix_end;
}
p++, t++;
}
}
common_prefix_end:
p = pstem;
t = tstem;
/* count path components */
for (count = 0; '\0' != *p; count++)
{
while ('/' == *p)
p++;
while ('/' != *p && '\0' != *p)
p++;
}
/* make relative path */
if (0 == count)
{
/* special case symlink loop: a -> a/stem */
while (PosixTargetPath < tstem)
{
tstem--;
if ('/' != *tstem)
break;
}
while (PosixTargetPath < tstem)
{
tstem--;
if ('/' == *tstem)
{
tstem++;
break;
}
}
}
Length = lstrlenA(tstem);
Length += !!Length; /* add tstem term-0 */
if (3 * count + Length > sizeof PosixTargetPath)
{
Result = STATUS_IO_REPARSE_DATA_INVALID;
goto exit;
}
memmove(PosixTargetPath + 3 * count, tstem, Length);
for (index = 0; count > index; index++)
{
PosixTargetPath[index * 3 + 0] = '.';
PosixTargetPath[index * 3 + 1] = '.';
PosixTargetPath[index * 3 + 2] = '/';
}
if (0 == Length)
PosixTargetPath[(count - 1) * 3 + 2] = '\0';
}
Result = FspPosixMapPosixToWindowsPath(PosixTargetPath, &TargetPath);
if (!NT_SUCCESS(Result))
goto exit;
Length = lstrlenW(TargetPath);
if (Length > *PSize)
TargetPathLength = lstrlenW(TargetPath) * sizeof(WCHAR);
if (TargetPathLength > *PSize)
{
Result = STATUS_BUFFER_TOO_SMALL;
goto exit;
}
*PSize = Length;
memcpy(Buffer, TargetPath, Length * sizeof(WCHAR));
*PSize = TargetPathLength;
memcpy(Buffer, TargetPath, TargetPathLength);
Result = STATUS_SUCCESS;