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

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,24 @@
Thu Feb 22 13:38:00 2001 Corinna Vinschen <corinna@vinschen.de>
* shortcut.c: New file. Provides a C interface to reading of
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'.
Thu Feb 22 12:04:00 2001 Corinna Vinschen <corinna@vinschen.de>
* fhandler.cc (fhandler_disk_file::open): Use `inner_suffixes' when

3
winsup/cygwin/Makefile.in
View File

@ -124,7 +124,8 @@ DLL_OFILES:=assert.o autoload.o cygheap.o dcrt0.o debug.o delqueue.o dir.o \
miscfuncs.o mmap.o \
net.o ntea.o passwd.o path.o pinfo.o pipe.o poll.o pthread.o regexp.o \
regerror.o regsub.o registry.o resource.o scandir.o security.o select.o \
shared.o signal.o sigproc.o smallprint.o spawn.o strace.o strsep.o \
shared.o \
shortcut.o signal.o sigproc.o smallprint.o spawn.o strace.o strsep.o \
sync.o syscalls.o sysconf.o syslog.o termios.o thread.o times.o tty.o \
uinfo.o uname.o wait.o window.o \
$(EXTRA_DLL_OFILES) $(EXTRA_OFILES) $(MT_SAFE_OBJECTS)

15
winsup/cygwin/cygerrno.h
View File

@ -8,9 +8,20 @@ This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#ifdef __cplusplus
extern "C" {
#endif
int __stdcall geterrno_from_win_error (DWORD code, int deferrno) __attribute__ ((regparm(2)));
#ifdef __cplusplus
}
#endif
#ifdef __cplusplus
void __stdcall seterrno_from_win_error (const char *file, int line, DWORD code) __attribute__ ((regparm(3)));
void __stdcall seterrno (const char *, int line) __attribute__ ((regparm(2)));
int __stdcall geterrno_from_win_error (DWORD code, int deferrno) __attribute__ ((regparm(2)));
#define __seterrno() seterrno (__FILE__, __LINE__)
#define __seterrno_from_win_error(val) seterrno_from_win_error (__FILE__, __LINE__, val)
@ -32,3 +43,5 @@ class save_errno
extern const char *__sp_fn;
extern int __sp_ln;
#endif /* __cplusplus */

2
winsup/cygwin/errno.cc
View File

@ -110,7 +110,7 @@ errmap[] =
{ 0, NULL, 0}
};
int __stdcall
extern "C" int __stdcall
geterrno_from_win_error (DWORD code, int deferrno)
{
for (int i = 0; errmap[i].w != 0; ++i)

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;

171
winsup/cygwin/shortcut.c Normal file
View File

@ -0,0 +1,171 @@
/* 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;
}

28
winsup/cygwin/shortcut.h Normal file
View File

@ -0,0 +1,28 @@
/* shortcut.h: Hader file for shortcut.c
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. */
#ifdef __cplusplus
extern "C" {
#endif
/* The header written to a shortcut by Cygwin or U/WIN. */
#define SHORTCUT_HDR_SIZE 76
extern char shortcut_header[];
extern BOOL shortcut_initalized;
extern void create_shortcut_header ();
int check_shortcut (const char *path, DWORD fileattr, HANDLE h,
char *contents, int *error, unsigned *pflags);
#ifdef __cplusplus
};
#endif