def send_packet(self, packet, **kwargs):
"""
Sending a packet to an host does not require any
connection or any call to connect. So if a packet is the
first for a destination host. Associated rules are added in
iptables. Then every fields are setup in order to call the
transfer it to the lowest layer
"""
try:
ip = self.remoteIP if self.remoteIP else kwargs["IP"]["dst"]
except KeyError:
raise Exception("[Errno 89] Destination address required")
if not re.match(self.ipregex, ip): #Then this is a dn
realip = transversal_layer_access["DNS"].nslookup(ip)
if realip:
ip = realip
else:
raise Exception("[Errno -5] No address associated with hostname")
if not self.connectionID:
block_icmp_port_unreachable()
self.connectionID = (self.localIP, self.localPort)
self.lowerLayers['default'].register_upper_layer(self.connectionID, self)
if not kwargs.has_key("UDP"):
kwargs["UDP"] = {}
kwargs["UDP"]["sport"] = self.localPort
kwargs["UDP"]["dport"] = self.remotePort if self.remotePort else kwargs["UDP"]["dport"]
if not kwargs.has_key("IP"):
kwargs["IP"] = {}
kwargs["IP"]["src"] = self.localIP
kwargs["IP"]["dst"] = ip
self.transfer_packet(packet, **kwargs)
def bind(self, port, app=None, fork=None): #App and fork are just here to be generic with the tcp bind from the pysocket point of view
"""
Bind like connect will register a handler in the UDP layer.
But it will also prevent the host to send ICMP host port unreachable
"""
self.localPort = port
block_icmp_port_unreachable() #block_outgoing_packets("udp", self.localIP, self.localPort, None, None)
self.connectionID = (self.localIP, self.localPort)
self.lowerLayers['default'].register_upper_layer(self.connectionID, self)
