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#!/usr/bin/env python
# Impacket - Collection of Python classes for working with network protocols.
#
# Copyright Fortra, LLC and its affiliated companies
#
# All rights reserved.
#
# This software is provided under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
# Description:
# Simple packet sniffer.
#
# This packet sniffer uses a raw socket to listen for packets
# in transit corresponding to the specified protocols.
#
# Note that the user might need special permissions to be able to use
# raw sockets.
#
# Authors:
# Gerardo Richarte (@gerasdf)
# Javier Kohen
#
# Reference for:
# ImpactDecoder
#
from select import select
import socket
import sys
from impacket import ImpactDecoder
DEFAULT_PROTOCOLS = ('icmp', 'tcp', 'udp')
if len(sys.argv) == 1:
toListen = DEFAULT_PROTOCOLS
print("Using default set of protocols. A list of protocols can be supplied from the command line, eg.: %s <proto1> [proto2] ..." % sys.argv[0])
else:
toListen = sys.argv[1:]
# Open one socket for each specified protocol.
# A special option is set on the socket so that IP headers are included with
# the returned data.
sockets = []
for protocol in toListen:
try:
protocol_num = socket.getprotobyname(protocol)
except socket.error:
print("Ignoring unknown protocol:", protocol)
toListen.remove(protocol)
continue
s = socket.socket(socket.AF_INET, socket.SOCK_RAW, protocol_num)
s.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
sockets.append(s)
if 0 == len(toListen):
print("There are no protocols available.")
sys.exit(0)
print("Listening on protocols:", toListen)
# Instantiate an IP packets decoder.
# As all the packets include their IP header, that decoder only is enough.
decoder = ImpactDecoder.IPDecoder()
while len(sockets) > 0:
# Wait for an incoming packet on any socket.
ready = select(sockets, [], [])[0]
for s in ready:
packet = s.recvfrom(4096)[0]
if 0 == len(packet):
# Socket remotely closed. Discard it.
sockets.remove(s)
s.close()
else:
# Packet received. Decode and display it.
packet = decoder.decode(packet)
print(packet)
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