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    <p>I've been recently doing something similar, checkout this code in python:</p> <pre><code>#!/usr/bin/python import socket, sys, io from struct import * from time import localtime, strftime #------------------------------------------------------------------------------- class ETHHeader: # ethernet header def __init__(self, s): data = s.read(14) hdr = unpack("!6s6sH", data) self.destination_addr = data[0:6] # mac address self.source_addr = data[6:12] # mac address self.protocol = socket.ntohs(hdr[2]) def src_addr(self): return addr_to_str(self.srouce_addr) def dst_addr(self): return addr_to_str(self.destination_addr) def is_IP(self): return self.protocol == 8 #Convert a string of 6 characters of ethernet address into a dash separated hex string def addr_to_str (a) : b = "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x" % (ord(a[0]), ord(a[1]) , ord(a[2]), \ ord(a[3]), ord(a[4]) , ord(a[5])) return b #------------------------------------------------------------------------------- class IPHeader: def __init__(self, s): iph = unpack('!BBHHHBBH4s4s', s.read(20)) self.protocol = iph[6] self.src_addr = socket.inet_ntoa(iph[8]); self.dst_addr = socket.inet_ntoa(iph[9]); def __str__(self): return "(" + self.proto() + " " + self.src_addr + " -&gt; " + self.dst_addr + ")" def proto(self): return { 6: "TCP", 1: "ICMP", 17: "UDP" }.get(self.protocol, "???") #------------------------------------------------------------------------------- class UDPHeader: def __init__(self, s): hdr = unpack("!HHHH", s.read(8)) self.source_port = hdr[0] self.destination_port = hdr[1] self.length = hdr[2] self.checksum = hdr[3] #------------------------------------------------------------------------------- try: #s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_UDP) # Using this instead of the above we will get: # Also incoming packets. # Ethernet header as part of the received packet. # TCP, UDP, ... s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.ntohs(0x0003)) except socket.error, msg: print "Socket could not be created. Error Code : " + str(msg[0]) + ' Message ' + msg[1] sys.exit() #------------------------------------------------------------------------------- def communication_between_ports(udp_header, ports): src = udp_header.source_port dst = udp_header.destination_port return src in ports and dst in ports def communication_between_ips(ip_header, ips): src = ip_header.src_addr dst = ip_header.dst_addr return src in ips and dst in ips #------------------------------------------------------------------------------- while True: packet = s.recvfrom(65535) # buffer size data = io.BytesIO(packet[0]) eth = ETHHeader(data) if not eth.is_IP(): continue iph = IPHeader(data) udph = UDPHeader(data) if not communication_between_ips(iph, ["192.168.1.3", "192.168.1.102"]): continue if iph.proto() != "UDP": continue ## To filter by port: #if udph.source_port != &lt;PORT-YOU-WANT&gt; # continue time = localtime() timestr = strftime("%H:%M:%S", time) a = iph.src_addr b = iph.dst_addr direction = " -&gt; " if a &gt; b: tmp = a a = b b = tmp direction = " &lt;- " print timestr + ": " + a + str(direction) + b </code></pre> <p>I'm extracting only the data that I need from each layer (ETH, IP, ...) but you should be able to easily extend it.</p> <p>Got most of the information from <a href="http://www.binarytides.com/python-packet-sniffer-code-linux/" rel="nofollow">this blog post</a>.</p>
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    1. POHow to listen to data sent via UDP to IP?
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    1. USPeter Jankuliak
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