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* shortcut.c: New file. Provides a C interface to reading of

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Windows shortcuts to avoid compiler flag `-fvtable-thunks'.
        * shortcut.h: Ditto.
        * Makefile.in: Add shortcut.o to DLL_OFILES.
        * cygerrno.h: Provide a C interface to `geterrno_from_win_error' for
        using in shortcut.c.
        * errno.cc (geterrno_from_win_error): Define as extern "C".
        * path.cc (struct symlink_info): Remove methods `check_shortcut' and
        `check_sysfile'.
        (shortcut_header): Move to shortcut.c.
        (shortcut_initalized): Ditto.
        (create_shortcut_header): Ditto.
        (cmp_shortcut_header): Ditto.
        (symlink_info::check_shortcut): Ditto. Reorganize as a plain C function.
        (symlink_info::check_sysfile): Redefine as a global function using the
        same parameter list as `check_shortcut' for clearness.
        (symlink_info::check): Change parameter list for calls to
        `check_shortcut' and `check_sysfile'.
This commit is contained in:
Corinna Vinschen
2001-02-22 12:56:36 +00:00
parent 957059c831
commit 79e56091c9
7 changed files with 253 additions and 168 deletions
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171
winsup/cygwin/shortcut.c Normal file
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/* 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 "cygerrno.h"
#include "shortcut.h"
/* This is needed to avoid including path.h which is a pure C++ header. */
#define PATH_SYMLINK MOUNT_SYMLINK
#define debug_printf(x) strcpy (contents, x)
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))
{
debug_printf ("CoCreateInstance failed");
goto close_it;
}
/* Get a pointer to the IPersistFile interface. */
hres = psl->lpVtbl->QueryInterface (psl, &IID_IPersistFile, (void **)&ppf);
if (FAILED (hres))
{
debug_printf ("QueryInterface failed");
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))
{
debug_printf ("Load failed");
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))
{
debug_printf ("ReadFile failed");
*error = EIO;
goto close_it_dont_set_error;
}
if (got == SHORTCUT_HDR_SIZE && !cmp_shortcut_header (file_header))
{
hres = psl->lpVtbl->GetDescription (psl, contents, MAX_PATH);
if (FAILED (hres))
{
debug_printf ("GetDescription failed");
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))
{
debug_printf ("SetRelativePath failed");
goto close_it;
}
/* Get the path to the shortcut target. */
hres = psl->lpVtbl->GetPath (psl, contents, MAX_PATH, &wfd, 0);
if (FAILED(hres))
{
debug_printf ("GetPath failed");
goto close_it;
}
}
/* It's a symlink. */
*pflags = PATH_SYMLINK;
res = strlen (contents);
close_it:
if (FAILED (hres))
*error = geterrno_from_win_error (HRESULT_CODE (hres), EACCES);
close_it_dont_set_error:
/* 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;
}