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junc.c
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junc.c
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/* General License for Open Source projects published by
Olof Lagerkvist - LTR Data.
Copyright (c) Olof Lagerkvist
http://www.ltr-data.se
olof@ltr-data.se
The above copyright notice shall be included in all copies or
substantial portions of the Software.
modified as needed to compile with TinyCC */
#ifndef UNICODE
#define UNICODE
#endif
#ifndef _UNICODE
#define _UNICODE
#endif
#define _WIN32_WINNT 0x0500
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef __TINYC__
#define __MSABI_LONG(x) x ## l
#define ERROR_INVALID_REPARSE_DATA __MSABI_LONG(4392)
#define ERROR_NOT_A_REPARSE_POINT __MSABI_LONG(4390)
#define CTL_CODE(DeviceType,Function,Method,Access) (((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method))
#define FILE_DEVICE_FILE_SYSTEM 0x00000009
#define METHOD_BUFFERED 0
#define FILE_ANY_ACCESS 0
#define FILE_SPECIAL_ACCESS (FILE_ANY_ACCESS)
#define FSCTL_SET_REPARSE_POINT CTL_CODE(FILE_DEVICE_FILE_SYSTEM,41,METHOD_BUFFERED,FILE_SPECIAL_ACCESS)
#define FSCTL_GET_REPARSE_POINT CTL_CODE(FILE_DEVICE_FILE_SYSTEM,42,METHOD_BUFFERED,FILE_ANY_ACCESS)
#define FSCTL_DELETE_REPARSE_POINT CTL_CODE(FILE_DEVICE_FILE_SYSTEM,43,METHOD_BUFFERED,FILE_SPECIAL_ACCESS)
typedef struct _UNICODE_STRING {
USHORT Length;
USHORT MaximumLength;
PWSTR Buffer;
} UNICODE_STRING, *PUNICODE_STRING;
LPWSTR* WINAPI CommandLineToArgvW(LPCWSTR, int*);
BOOL WINAPI RtlDosPathNameToNtPathName_U(PCWSTR , PUNICODE_STRING , PCWSTR *, VOID *);
#else
#include <winioctl.h>
#include <shellapi.h>
#endif
typedef struct _REPARSE_DATA_MOUNT_POINT
{
DWORD ReparseTag;
WORD ReparseDataLength;
WORD Reserved;
WORD NameOffset;
WORD NameLength;
WORD DisplayNameOffset;
WORD DisplayNameLength;
BYTE Data[65536];
} REPARSE_DATA_MOUNT_POINT, *PREPARSE_DATA_MOUNT_POINT;
int main(int argc, char **argv)
{
REPARSE_DATA_MOUNT_POINT ReparseData = { 0 };
HANDLE h;
DWORD dw;
BOOL bDirectoryCreated = FALSE;
BOOL bRemoval = FALSE;
UNICODE_STRING targetPATH;
wchar_t** wargv = CommandLineToArgvW(GetCommandLineW(), &argc);
if ((argc < 2) | (argc > 3))
{
printf("Usage:\ncreate: %S emptyDir/nonexistentDir targetDir\
\ninfo : %S path_to_junction_directory\ndelete: %S -r path_to_junction_directory\n\
\nnote: junction directory will be created if not exist\n", wargv[0], wargv[0], wargv[0]);
return 5;
}
if (argc == 3 ? wcscmp(wargv[1], L"-r") == 0 : FALSE)
{
bRemoval = TRUE;
argc--;
wargv++;
argv++;
}
if (bRemoval)
h = CreateFileW(wargv[1], GENERIC_WRITE, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS |
FILE_FLAG_OPEN_REPARSE_POINT, NULL);
else if (argc == 2)
h = CreateFileW(wargv[1], GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT,
NULL);
else
{
h = CreateFileW(wargv[1], GENERIC_WRITE, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS |
FILE_FLAG_OPEN_REPARSE_POINT, NULL);
if ((h == INVALID_HANDLE_VALUE) &&
(GetLastError() == ERROR_FILE_NOT_FOUND))
{
if (CreateDirectoryW(wargv[1], NULL))
bDirectoryCreated = TRUE;
else
{
return 3;
}
h = CreateFileW(wargv[1], GENERIC_READ | GENERIC_WRITE, 0, NULL,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS |
FILE_FLAG_OPEN_REPARSE_POINT, NULL);
}
}
if (h == INVALID_HANDLE_VALUE)
return 3;
if (bRemoval)
{
ReparseData.ReparseTag = IO_REPARSE_TAG_MOUNT_POINT;
ReparseData.ReparseDataLength = 0;
if (!DeviceIoControl(h, FSCTL_DELETE_REPARSE_POINT, &ReparseData,
REPARSE_GUID_DATA_BUFFER_HEADER_SIZE, NULL, 0, &dw,
NULL))
{
switch (GetLastError())
{
case ERROR_INVALID_REPARSE_DATA:
fprintf(stderr,
"The reparse data on %S is invalid.\n",
wargv[1]);
break;
case ERROR_INVALID_PARAMETER:
fputs("Need Windows 2000 or later.\r\n",
stderr);
break;
case ERROR_INVALID_FUNCTION:
fputs("Need NTFS volumes.\r\n",
stderr);
break;
case ERROR_NOT_A_REPARSE_POINT:
case ERROR_DIRECTORY:
case ERROR_DIR_NOT_EMPTY:
fprintf(stderr,
"Not a reparse point: %S \r\n", wargv[1]);
break;
default:
fprintf(stderr,
"Error getting reparse data from %S\r\n",
wargv[1]);
}
return 1;
}
return 0;
}
if (argc > 2)
{
RtlDosPathNameToNtPathName_U(wargv[2], &targetPATH, NULL, NULL);
int iSize = (int)wcslen(targetPATH.Buffer) << 1;
if ((iSize + 6 > sizeof(ReparseData.Data)) | (iSize == 0))
{
fprintf(stderr, "Name is too long: %S\r\n", targetPATH.Buffer);
return 4;
}
ReparseData.ReparseTag = IO_REPARSE_TAG_MOUNT_POINT;
ReparseData.ReparseDataLength = (WORD)(8 + iSize + 2 + iSize + 2);
ReparseData.NameLength = (WORD)iSize;
ReparseData.DisplayNameOffset = (WORD)(iSize + 2);
ReparseData.DisplayNameLength = (WORD)iSize;
wcscpy((LPWSTR)ReparseData.Data, targetPATH.Buffer);
wcscpy((LPWSTR)(ReparseData.Data + ReparseData.DisplayNameOffset),
targetPATH.Buffer);
if (!DeviceIoControl(h, FSCTL_SET_REPARSE_POINT, &ReparseData,
16 + iSize + 2 + iSize + 2, NULL, 0, &dw, NULL))
{
switch (GetLastError())
{
case ERROR_INVALID_REPARSE_DATA:
fprintf(stderr, "Invalid target path: %S\r\n", targetPATH.Buffer);
break;
case ERROR_INVALID_PARAMETER:
fputs("Need Windows 2000 or later.\r\n",
stderr);
break;
case ERROR_INVALID_FUNCTION:
case ERROR_NOT_A_REPARSE_POINT:
fputs("Need NTFS volumes.\r\n",
stderr);
break;
case ERROR_DIRECTORY:
case ERROR_DIR_NOT_EMPTY:
fputs("Directory is not empty.\r\n", stderr);
break;
default:
fprintf(stderr,
"Error joining %S to %S\r\n",
targetPATH.Buffer, wargv[1]);
}
CloseHandle(h);
if (bDirectoryCreated)
RemoveDirectoryW(wargv[1]);
return 1;
}
fprintf(stdout,"%S -> %S\r\n", wargv[1], targetPATH.Buffer);
return 0;
}
if (!DeviceIoControl(h, FSCTL_GET_REPARSE_POINT, NULL, 0, &ReparseData,
sizeof ReparseData, &dw, NULL))
{
switch (GetLastError())
{
case ERROR_INVALID_REPARSE_DATA:
fprintf(stderr, "The reparse data on %S is invalid.\r\n",
wargv[1]);
return 1;
case ERROR_INVALID_PARAMETER:
fputs("Need Windows 2000 or later.\r\n",
stderr);
break;
case ERROR_INVALID_FUNCTION:
fputs("Need NTFS volumes.\r\n",
stderr);
break;
case ERROR_NOT_A_REPARSE_POINT:
case ERROR_DIRECTORY:
case ERROR_DIR_NOT_EMPTY:
fprintf(stderr, "Not a reparse point: %S\r\n", wargv[1]);
break;
default:
fprintf(stderr,
"Error getting reparse data from %S\r\n",
wargv[1]);
}
return 1;
}
if (ReparseData.ReparseTag != IO_REPARSE_TAG_MOUNT_POINT)
{
fputs("Not a junction.\r\n", stderr);
return 2;
}
else
{
UNICODE_STRING target_name;
target_name.MaximumLength =
target_name.Length =
ReparseData.NameLength;
target_name.Buffer =
(PWSTR)ReparseData.Data + ReparseData.NameOffset;
fprintf(stdout,"%S -> %S\r\n", wargv[1], target_name.Buffer);
return 0;
}
}