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* path.cc: Include malloc.h for alloca. 

(is_symlink): Rewrite.  Just read the whole file in memory rather
	than by parts.  Account for an ITEMIDLIST if present, as well as
	the new style of Cygwin shortcut supporting targets > MAX_PATH.
This commit is contained in:
Brian Dessent 2008-03-16 17:04:02 +00:00
parent 615d9a0696
commit bff091bcfe
2 changed files with 53 additions and 48 deletions
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7
winsup/utils/ChangeLog
View File

@ -1,3 +1,10 @@
2008-03-16 Brian Dessent <brian@dessent.net>
* path.cc: Include malloc.h for alloca.
(is_symlink): Rewrite. Just read the whole file in memory rather
than by parts. Account for an ITEMIDLIST if present, as well as
the new style of Cygwin shortcut supporting targets > MAX_PATH.
2008-03-12 Corinna Vinschen <corinna@vinschen.de>
* cygpath.cc (do_sysfolders): Use cygwin_conv_path.

94
winsup/utils/path.cc
View File

@ -18,6 +18,7 @@ details. */
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include "path.h"
#include "cygwin/include/cygwin/version.h"
#include "cygwin/include/sys/mount.h"
@ -172,60 +173,57 @@ is_symlink (HANDLE fh)
bool
readlink (HANDLE fh, char *path, int maxlen)
{
int got;
int magic = get_word (fh, 0x0);
DWORD rv;
char *buf, *cp;
unsigned short len;
win_shortcut_hdr *file_header;
BY_HANDLE_FILE_INFORMATION fi;
if (magic == SHORTCUT_MAGIC)
if (!GetFileInformationByHandle (fh, &fi)
|| fi.nFileSizeHigh != 0
|| fi.nFileSizeLow > 8192)
return false;
buf = (char *) alloca (fi.nFileSizeLow + 1);
file_header = (win_shortcut_hdr *) buf;
if (SetFilePointer (fh, 0L, NULL, FILE_BEGIN) == INVALID_SET_FILE_POINTER
|| !ReadFile (fh, buf, fi.nFileSizeLow, &rv, NULL)
|| rv != fi.nFileSizeLow)
return false;
if (fi.nFileSizeLow > sizeof (file_header)
&& cmp_shortcut_header (file_header))
{
int offset = get_word (fh, 0x4c);
int slen = get_word (fh, 0x4c + offset + 2);
if (slen >= maxlen)
{
SetLastError (ERROR_FILENAME_EXCED_RANGE);
return false;
}
if (SetFilePointer (fh, 0x4c + offset + 4, 0, FILE_BEGIN) ==
INVALID_SET_FILE_POINTER && GetLastError () != NO_ERROR)
return false;
if (!ReadFile (fh, path, slen, (DWORD *) &got, 0))
return false;
else if (got < slen)
{
SetLastError (ERROR_READ_FAULT);
return false;
}
else
path[got] = '\0';
cp = buf + sizeof (win_shortcut_hdr);
if (file_header->flags & WSH_FLAG_IDLIST) /* Skip ITEMIDLIST */
cp += *(unsigned short *) cp + 2;
if (!(len = *(unsigned short *) cp))
return false;
cp += 2;
/* Has appended full path? If so, use it instead of description. */
unsigned short relpath_len = *(unsigned short *) (cp + len);
if (cp + len + 2 + relpath_len < buf + fi.nFileSizeLow)
{
cp += len + 2 + relpath_len;
len = *(unsigned short *) cp;
cp += 2;
}
if (len + 1 > maxlen)
return false;
memcpy (path, cp, len);
path[len] = '\0';
return true;
}
else if (magic == SYMLINK_MAGIC)
else if (strncmp (buf, SYMLINK_COOKIE, strlen (SYMLINK_COOKIE)) == 0
&& fi.nFileSizeLow - strlen (SYMLINK_COOKIE) <= (unsigned) maxlen
&& buf[fi.nFileSizeLow - 1] == '\0')
{
char cookie_buf[sizeof (SYMLINK_COOKIE) - 1];
if (SetFilePointer (fh, 0, 0, FILE_BEGIN) == INVALID_SET_FILE_POINTER
&& GetLastError () != NO_ERROR)
return false;
if (!ReadFile (fh, cookie_buf, sizeof (cookie_buf), (DWORD *) &got, 0))
return false;
else if (got == sizeof (cookie_buf)
&& memcmp (cookie_buf, SYMLINK_COOKIE, sizeof (cookie_buf)) == 0)
{
if (!ReadFile (fh, path, maxlen, (DWORD *) &got, 0))
return false;
else if (got >= maxlen)
{
SetLastError (ERROR_FILENAME_EXCED_RANGE);
path[0] = '\0';
return false;
}
else
path[got] = '\0';
}
}
strcpy (path, &buf[strlen (SYMLINK_COOKIE)]);
return true;
}
else
return false;
return true;
}
typedef struct mnt