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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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181
winsup/cygwin/path.cc
View File

@ -74,9 +74,7 @@ details. */
#include "registry.h"
#include "security.h"
#include <assert.h>
#include <shlobj.h>
#include <objidl.h>
#include <objbase.h>
#include "shortcut.h"
static int normalize_win32_path (const char *src, char *dst);
static void slashify (const char *src, char *dst, int trailing_slash_p);
@ -94,8 +92,6 @@ struct symlink_info
int is_symlink;
int error;
symlink_info (): known_suffix (NULL), contents (buf + MAX_PATH + 1) {}
int check_shortcut (const char *, DWORD, HANDLE);
int check_sysfile (const char *, DWORD, HANDLE);
int check (const char *path, const suffix_info *suffixes);
};
@ -2195,35 +2191,6 @@ endmntent (FILE *)
/********************** Symbolic Link Support **************************/
/* The header written to a shortcut by Cygwin or U/WIN. */
#define SHORTCUT_HDR_SIZE 76
static char shortcut_header[SHORTCUT_HDR_SIZE];
static BOOL shortcut_initalized = FALSE;
static 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);
}
/* Create a symlink from FROMPATH to TOPATH. */
extern "C"
@ -2362,127 +2329,9 @@ next_suffix (char *ext_here, const suffix_info *&suffixes)
return 0;
}
int
symlink_info::check_shortcut (const char *path, DWORD fileattr, HANDLE h)
{
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->QueryInterface (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->Load (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->GetDescription (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);
debug_printf ("full_path = <%s>", full_path);
/* Set relative path inside of IShellLink interface. */
hres = psl->SetRelativePath (full_path, 0);
if (FAILED (hres))
{
debug_printf ("SetRelativePath failed");
goto close_it;
}
/* Get the path to the shortcut target. */
hres = psl->GetPath (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->Release();
/* Release the pointer to IShellLink. */
if (psl)
psl->Release();
/* Uninitialize COM library. */
CoUninitialize ();
syscall_printf ("%d = symlink.check_shortcut (%s, %s) (%p)",
res, path, contents, pflags);
return res;
}
int
symlink_info::check_sysfile (const char *path, DWORD fileattr, HANDLE h)
static int
check_sysfile (const char *path, DWORD fileattr, HANDLE h,
char *contents, int *error, unsigned *pflags)
{
char cookie_buf[sizeof (SYMLINK_COOKIE) - 1];
DWORD got;
@ -2491,19 +2340,19 @@ symlink_info::check_sysfile (const char *path, DWORD fileattr, HANDLE h)
if (! ReadFile (h, cookie_buf, sizeof (cookie_buf), &got, 0))
{
debug_printf ("ReadFile1 failed");
error = EIO;
*error = EIO;
}
else if (got == sizeof (cookie_buf)
&& memcmp (cookie_buf, SYMLINK_COOKIE, sizeof (cookie_buf)) == 0)
{
/* It's a symlink. */
pflags = PATH_SYMLINK;
*pflags = PATH_SYMLINK;
res = ReadFile (h, contents, MAX_PATH + 1, &got, 0);
if (!res)
{
debug_printf ("ReadFile2 failed");
error = EIO;
*error = EIO;
}
else
{
@ -2521,15 +2370,13 @@ symlink_info::check_sysfile (const char *path, DWORD fileattr, HANDLE h)
}
else if (got == sizeof (cookie_buf)
&& memcmp (cookie_buf, SOCKET_COOKIE, sizeof (cookie_buf)) == 0)
pflags |= PATH_SOCKET;
*pflags |= PATH_SOCKET;
else
{
/* Not a symlink, see if executable. */
if (!(pflags & PATH_ALL_EXEC) && has_exec_chars (cookie_buf, got))
pflags |= PATH_EXEC;
if (!(*pflags & PATH_ALL_EXEC) && has_exec_chars (cookie_buf, got))
*pflags |= PATH_EXEC;
}
syscall_printf ("%d = symlink.check_sysfile (%s, %s) (%p)",
res, path, contents, pflags);
return res;
}
@ -2615,12 +2462,16 @@ symlink_info::check (const char *in_path, const suffix_info *suffixes)
res = -1;
if (h == INVALID_HANDLE_VALUE)
goto file_not_symlink;
else if (sym_check == 1 && !(res = check_shortcut (path, fileattr, h)))
else if (sym_check == 1
&& !(res = check_shortcut (path, fileattr, h,
contents, &error, &pflags)))
{
CloseHandle (h);
goto file_not_symlink;
}
else if (sym_check == 2 && !(res = check_sysfile (path, fileattr, h)))
else if (sym_check == 2 &&
!(res = check_sysfile (path, fileattr, h,
contents, &error, &pflags)))
{
CloseHandle (h);
goto file_not_symlink;