146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/* shortcut.c: Read shortcuts. This part of the code must be in C because
|
|
the C++ interface to COM doesn't work without -fvtable-thunk
|
|
which is too dangerous to use.
|
|
|
|
Copyright 2001 Red Hat, Inc.
|
|
|
|
This file is part of Cygwin.
|
|
|
|
This software is a copyrighted work licensed under the terms of the
|
|
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
|
|
details. */
|
|
|
|
#include "winsup.h"
|
|
#include <shlobj.h>
|
|
#include <ctype.h>
|
|
#include <sys/types.h>
|
|
#include <sys/mount.h>
|
|
#include <errno.h>
|
|
#include "shortcut.h"
|
|
|
|
/* This is needed to avoid including path.h which is a pure C++ header. */
|
|
#define PATH_SYMLINK MOUNT_SYMLINK
|
|
|
|
char shortcut_header[SHORTCUT_HDR_SIZE];
|
|
BOOL shortcut_initalized = FALSE;
|
|
|
|
void
|
|
create_shortcut_header (void)
|
|
{
|
|
if (!shortcut_initalized)
|
|
{
|
|
shortcut_header[0] = 'L';
|
|
shortcut_header[4] = '\001';
|
|
shortcut_header[5] = '\024';
|
|
shortcut_header[6] = '\002';
|
|
shortcut_header[12] = '\300';
|
|
shortcut_header[19] = 'F';
|
|
shortcut_header[20] = '\f';
|
|
shortcut_header[60] = '\001';
|
|
shortcut_initalized = TRUE;
|
|
}
|
|
}
|
|
|
|
static BOOL
|
|
cmp_shortcut_header (const char *file_header)
|
|
{
|
|
create_shortcut_header ();
|
|
return memcmp (shortcut_header, file_header, SHORTCUT_HDR_SIZE);
|
|
}
|
|
|
|
int
|
|
check_shortcut (const char *path, DWORD fileattr, HANDLE h,
|
|
char *contents, int *error, unsigned *pflags)
|
|
{
|
|
HRESULT hres;
|
|
IShellLink *psl = NULL;
|
|
IPersistFile *ppf = NULL;
|
|
WCHAR wc_path[MAX_PATH];
|
|
char full_path[MAX_PATH];
|
|
WIN32_FIND_DATA wfd;
|
|
DWORD len = 0;
|
|
int res = 0;
|
|
|
|
/* Initialize COM library. */
|
|
CoInitialize (NULL);
|
|
|
|
/* Get a pointer to the IShellLink interface. */
|
|
hres = CoCreateInstance (&CLSID_ShellLink, NULL, CLSCTX_INPROC_SERVER,
|
|
&IID_IShellLink, (void **)&psl);
|
|
if (FAILED (hres))
|
|
goto close_it;
|
|
/* Get a pointer to the IPersistFile interface. */
|
|
hres = psl->lpVtbl->QueryInterface (psl, &IID_IPersistFile, (void **)&ppf);
|
|
if (FAILED (hres))
|
|
goto close_it;
|
|
/* Load the shortcut. */
|
|
MultiByteToWideChar(CP_ACP, 0, path, -1, wc_path, MAX_PATH);
|
|
hres = ppf->lpVtbl->Load (ppf, wc_path, STGM_READ);
|
|
if (FAILED (hres))
|
|
goto close_it;
|
|
/* Try the description (containing a POSIX path) first. */
|
|
if (fileattr & FILE_ATTRIBUTE_READONLY)
|
|
{
|
|
/* An additional check is needed to prove if it's a shortcut
|
|
really created by Cygwin or U/WIN. */
|
|
char file_header[SHORTCUT_HDR_SIZE];
|
|
DWORD got;
|
|
|
|
if (! ReadFile (h, file_header, SHORTCUT_HDR_SIZE, &got, 0))
|
|
{
|
|
*error = EIO;
|
|
goto close_it;
|
|
}
|
|
if (got == SHORTCUT_HDR_SIZE && !cmp_shortcut_header (file_header))
|
|
{
|
|
hres = psl->lpVtbl->GetDescription (psl, contents, MAX_PATH);
|
|
if (FAILED (hres))
|
|
goto close_it;
|
|
len = strlen (contents);
|
|
}
|
|
}
|
|
/* No description or not R/O: Check the "official" path. */
|
|
if (len == 0)
|
|
{
|
|
/* Convert to full path (easy way) */
|
|
if ((path[0] == '\\' && path[1] == '\\')
|
|
|| (_toupper (path[0]) >= 'A' && _toupper (path[0]) <= 'Z'
|
|
&& path[1] == ':'))
|
|
len = 0;
|
|
else
|
|
{
|
|
len = GetCurrentDirectory (MAX_PATH, full_path);
|
|
if (path[0] == '\\')
|
|
len = 2;
|
|
else if (full_path[len - 1] != '\\')
|
|
strcpy (full_path + len++, "\\");
|
|
}
|
|
strcpy (full_path + len, path);
|
|
/* Set relative path inside of IShellLink interface. */
|
|
hres = psl->lpVtbl->SetRelativePath (psl, full_path, 0);
|
|
if (FAILED (hres))
|
|
goto close_it;
|
|
/* Get the path to the shortcut target. */
|
|
hres = psl->lpVtbl->GetPath (psl, contents, MAX_PATH, &wfd, 0);
|
|
if (FAILED(hres))
|
|
goto close_it;
|
|
}
|
|
/* It's a symlink. */
|
|
*pflags = PATH_SYMLINK;
|
|
res = strlen (contents);
|
|
|
|
close_it:
|
|
/* Release the pointer to IPersistFile. */
|
|
if (ppf)
|
|
ppf->lpVtbl->Release(ppf);
|
|
/* Release the pointer to IShellLink. */
|
|
if (psl)
|
|
psl->lpVtbl->Release(psl);
|
|
/* Uninitialize COM library. */
|
|
CoUninitialize ();
|
|
|
|
return res;
|
|
}
|
|
|
|
|