def ReadPipeMessage(hPipe):
data = ""
fSuccess = 0
chBuf = create_string_buffer(BUFSIZE)
cbRead = DWORD(0)
while not fSuccess: # repeat loop if ERROR_MORE_DATA
fSuccess = ReadFile(hPipe, chBuf, BUFSIZE, byref(cbRead), None)
if fSuccess == 1:
data += chBuf.value
break
elif GetLastError() != ERROR_MORE_DATA:
break
data += chBuf.value
return loads(data)
def ExecAs(scriptPath, asAdministrator, funcName, *args, **kwargs):
pipeName = "\\\\.\\pipe\\" + str(GUID.create_new())
Msg("creating named pipe")
hPipe = CreateNamedPipe(
pipeName,
PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_WAIT,
PIPE_UNLIMITED_INSTANCES,
BUFSIZE,
BUFSIZE,
0,
None
)
if hPipe == INVALID_HANDLE_VALUE:
raise Exception("Error in creating Named Pipe")
overlapped = OVERLAPPED()
overlapped.hEvent = CreateEvent(None, 1, 0, None)
try:
Msg("calling ConnectNamedPipe")
ConnectNamedPipe(hPipe, byref(overlapped))
localPath = dirname(__file__.decode('mbcs'))
Msg("starting subprocess")
hProcess = RunAs(
abspath(join(localPath, "..", "..", "EventGhost.exe")),
asAdministrator,
"-execfile",
GetUncPathOf(join(localPath, "PipedProcessClient.py")),
pipeName,
str(eg.debugLevel)
)
Msg("waiting for subprocess to connect")
pHandles = (HANDLE * 2)(overlapped.hEvent, hProcess)
ret = WaitForMultipleObjects(2, pHandles, 0, 25000)
if ret == WAIT_OBJECT_0:
# connect event
Msg("got connect event")
elif ret == WAIT_OBJECT_0 + 1:
raise Exception("Unexpected end of subprocess.")
elif ret == WAIT_TIMEOUT:
raise Exception("Timeout in waiting for subprocess.")
else:
raise Exception("Unknown return value")
Msg("sending startup message")
WritePipeMessage(
hPipe,
MESSAGE_ARGS,
(GetUncPathOf(scriptPath), funcName, args, kwargs)
)
chBuf = create_string_buffer(BUFSIZE)
cbRead = DWORD(0)
while True:
fSuccess = ReadFile(hPipe, chBuf, BUFSIZE, byref(cbRead), None)
if ((fSuccess == 1) or (cbRead.value != 0)):
code, data = loads(chBuf.value)
if code == MESSAGE_STDERR:
sys.stderr.write(data)
elif code == MESSAGE_STDOUT:
sys.stdout.write(data)
elif code == MESSAGE_RESULT:
result = data
break
elif code == MESSAGE_EXCEPTION:
break
else:
raise Exception("Unknown message type %r" % code)
FlushFileBuffers(hPipe)
DisconnectNamedPipe(hPipe)
finally:
CloseHandle(hPipe)
CloseHandle(overlapped.hEvent)
if code == MESSAGE_EXCEPTION:
raise Exception("Child process raised an exception\n" + data)
return result