def __connect(self):
"""
Connect to the PED-RPC server.
"""
# if we have a pre-existing server socket, ensure it's closed.
self.__disconnect()
# connect to the server, timeout on failure.
self.__server_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.__server_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR,
1)
self.__server_sock.settimeout(3.0)
try:
self.__server_sock.connect((self.__host, self.__port))
except socket.error as e:
if self.__retry != 5:
self.__retry += 1
time.sleep(5)
self.__connect()
else:
raise exception.BoofuzzRpcError(
'PED-RPC> unable to connect to server {0}:{1}. Error message: "{2}"\n'
.format(self.__host, self.__port, e))
# disable timeouts and lingering.
self.__server_sock.settimeout(None)
self.__server_sock.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER,
self.NOLINGER)
def __pickle_recv(self):
"""
This routine is used for marshaling arbitrary data from the PyDbg server. We can send pretty much anything here.
For example a tuple containing integers, strings, arbitrary objects and structures. Our "protocol" is a simple
length-value protocol where each datagram is prefixed by a 4-byte length of the data to be received.
@raise pdx: An exception is raised if the connection was severed.
@rtype: Mixed
@return: Whatever is received over the socket.
"""
try:
# TODO: this should NEVER fail, but alas, it does and for the time being i can't figure out why.
# it gets worse. you would think that simply returning here would break things, but it doesn't.
# gotta track this down at some point.
recvd = self.__server_sock.recv(4)
length = struct.unpack("<L", recvd)[0]
except Exception:
return
try:
received = b""
while length:
chunk = self.__server_sock.recv(length)
received += chunk
length -= len(chunk)
except socket.error as e:
raise exception.BoofuzzRpcError(
"PED-RPC> unable to connect to server "
'{0}:{1}. Error message: "{2}"\n'.format(
self.__host, self.__port, e))
return pickle.loads(received)
def __pickle_send(self, data):
"""
This routine is used for marshaling arbitrary data to the PyDbg server. We can send pretty much anything here.
For example a tuple containing integers, strings, arbitrary objects and structures. Our "protocol" is a simple
length-value protocol where each datagram is prefixed by a 4-byte length of the data to be received.
@type data: Mixed
@param data: Data to marshal and transmit. Data can *pretty much* contain anything you throw at it.
@raise pdx: An exception is raised if the connection was severed.
"""
data = pickle.dumps(data, protocol=2)
self.__debug("sending %d bytes" % len(data))
try:
self.__server_sock.send(struct.pack("<L", len(data)))
self.__server_sock.send(data)
except socket.error as e:
raise exception.BoofuzzRpcError(
"PED-RPC> unable to connect to server "
'{0}:{1}. Error message: "{2}"\n'.format(
self.__host, self.__port, e))
