BackupRead problem

Sat Jan 15 10:06:58 EST 2011

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)