BackupRead problem

[Stefan Sonnenberg-Carstens]

I'm trying to create a Backup/Restore app.
I'm really struggeling for a long time.

I can successfully read directories, but not files.
Every time, I'll try I get "Access denied", Error 5.

It's running with admin privs.

Any ideas ?

#!python
import sys
import os
import os.path
import getopt
import time


DELETE=0x00010000
READ_CONTROL=0x00020000
WRITE_DAC=0x00040000
WRITE_OWNER=0x00080000
SYNCHRONIZE=0x00100000
STANDARD_RIGHTS_REQUIRED=0x000F0000L
STANDARD_RIGHTS_READ=READ_CONTROL
STANDARD_RIGHTS_WRITE=READ_CONTROL
STANDARD_RIGHTS_EXECUTE=READ_CONTROL
STANDARD_RIGHTS_ALL=0x001F0000
SPECIFIC_RIGHTS_ALL=0x0000FFFF

FILE_ATTRIBUTE_REPARSE_POINT=0x400

from ctypes import *

if os.name == 'nt':

     import win32security
     import win32process
     import win32file

     try:
         import win32api
     except ImportError,e:
         print >>sys.stderr,'Could not load win32api module. Can not 
continue'
         os._exit(1)
     try:
         import wmi
     except ImportError,e:
         print >>sys.stderr,'Could not load wmi module. Can not continue'
         os._exit(1)
     try:
         import ctypes
     except ImportError,e:
         print >>sys.stderr,'Could not load ctypes module. Can not continue'
         os._exit(1)
else:
     print >>sys.stderr,'Sorry, your platform %s is not supported' % os.name
     os._exit(1)

if len(sys.argv) >= 1:
     try:
         opts,args = getopt.getopt(sys.argv[1:],'h',('help',))
     except getopt.GetoptError,e:
         print str(e)
     if not ctypes.windll.shell32.IsUserAnAdmin():
         win32api.ShellExecute(None,'runas',sys.executable,' 
'.join(sys.argv),r'C:\WINDOWS',0)
     else:
         print >>sys.stderr,'Running with administrative privileges'
         token = 
win32security.OpenProcessToken(win32process.GetCurrentProcess(),win32security.TOKEN_ADJUST_PRIVILEGES|win32security.TOKEN_QUERY)
         if token:
             for priv in 
(win32security.SE_BACKUP_NAME,win32security.SE_RESTORE_NAME):
                 luid = win32security.LookupPrivilegeValue(None,priv)
                 newState = [(luid,win32security.SE_PRIVILEGE_ENABLED)]
                 try:
                     win32security.AdjustTokenPrivileges(token,0,newState)
                 except:
                     print >>sys.stderr,'Could not get (some) required 
priviledge(s): ',win32api.FormatMessage(win32api.GetLastError())
                     os._exit(1)
             win32api.CloseHandle(token)
         else:
             print >>sys.stderr,'Could not get token for running process'
             os._exit(1)
         print >>sys.stderr,'Acquired backup/restore context 
(SeRestorePrivilege and SeBackupPrivilege enabled)'
         inf = 
win32file.CreateFile(r'C:\Windows\System32\drivers\etc\hosts',READ_CONTROL,0,None,win32file.OPEN_EXISTING,win32file.FILE_FLAG_BACKUP_SEMANTICS,None)
         buf = win32file.AllocateReadBuffer(4096)
         ctx = 0
         (bytes_read,buf,ctx) = 
win32file.BackupRead(inf,4096,buf,False,True,ctx)