linux_scanner.py

import socket
import os
import struct
import ctypes
from ICMPHeader import ICMP

# host to listen on
HOST = socket.gethostbyname(socket.gethostname())


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)

    while 1:
        raw_buffer = sniffer.recvfrom(65565)[0]
        ip_header = raw_buffer[0:20]
        iph = struct.unpack('!BBHHHBBH4s4s', ip_header)

        # Create our IP structure
        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()