1 from scapy.all import *
  2 import sys
  3 def main():
  4     while(True):
  5         readpacket = sniff(count=1)
  6         if(readpacket[0].haslayer(ICMP)) and (readpacket[0][ICMP].type == 8):
  7             uh = str(readpacket[0][ICMP].chksum)
  8             print(( "Source IP Address: "       + readpacket[0].src  + "\n" +
  9                     "Destination IP address: "    + readpacket[0].dst  + "\n" +
 10                     "ICMP sequence number:"  + str(readpacket[0][ICMP].seq)))
 11             print("ICMP Checksum: {} ".format(uh))
 12             pktreturn = IP(src=readpacket[0].dst, dst=readpacket[0].src)/ICMP(type=0, id=readpacket[0][ICMP].id, se    q=readpacket[0][ICMP].seq)
 13             sendp(pktreturn)
 14
 15 if __name__ == "__main__":
 16     # execute only if run as a script
 17     main()
~