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