ip/icmp scanner

Network_and_802.11/scanner/ip_header_decode.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+
+import socket
+import os
+import struct
+import ctypes
+from ICMPHeader import ICMP
+
+# host to listen on
+HOST = '192.168.1.114'
+
+
+def main():
+    socket_protocol = socket.IPPROTO_ICMP
+    sniffer = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket_protocol)
+    sniffer.bind(( HOST, 0 ))
+    sniffer.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
+
+    # continually read in packets and parse their information
+    while 1:
+        # read in a packet and pass the first 20 bytes to initialize the IP structure
+        raw_buffer = sniffer.recvfrom(65565)[0]
+
+        #take first 20 characters for the ip header
+        ip_header = raw_buffer[0:20]
+
+        #unpack them
+        iph = struct.unpack('!BBHHHBBH4s4s' , ip_header)
+
+        # print
+        version_ihl = iph[0]
+        version = version_ihl >> 4
+        ihl = version_ihl & 0xF
+        iph_length = ihl * 4
+        ttl = iph[5]
+        protocol = iph[6]
+        s_addr = socket.inet_ntoa(iph[8]);
+        d_addr = socket.inet_ntoa(iph[9]);
+
+        print 'IP -> Version:' + str(version) + ', Header Length:' + str(ihl) + \
+        ', TTL:' + str(ttl) + ', Protocol:' + str(protocol) + ', Source:'\
+         + str(s_addr) + ', Destination:' + str(d_addr)
+
+        # create our ICMP structure
+        buf = raw_buffer[iph_length:iph_length + ctypes.sizeof(ICMP)]
+        icmp_header = ICMP(buf)
+
+        print "ICMP -> Type:%d, Code:%d" %(icmp_header.type, icmp_header.code) + '\n'
+
+
+
+if __name__ == '__main__':
+    main()