Python Traceroute program - Printable Version

Code
#!/usr/bin/python



import sys

import socket



def main():

      if len(sys.argv) > 1:

      dest_name = sys.argv[1]

      else:

      print("traceroute.py hostname")

      sys.exit(0) 



      #define destination address from hostname

      dest_addr = socket.gethostbyname(dest_name)



      #Return the protocol number for the icmp protocol. 

      icmp = socket.getprotobyname('icmp')



      #Return the protocol number for the udp protocol. 

      udp = socket.getprotobyname('udp')      



      #define ttl as 1 since we want to increment it gradually

      ttl = 1



      port = 33434



      while True:

      #we need two sockets for our connection. One for sending packets and one for receiving

      #we are going to receive the routers and servers responses in icmp. 

      #we are going to send packets by using the udp



      #create socket for the icmp packets

      recv_socket = socket.socket(socket.AF_INET, socket.SOCK_RAW, icmp)



      #create a socket for the udp packets

      send_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, udp)  



      #create a send socket object for sending udp packets

      a= send_socket.setsockopt(socket.SOL_IP, socket.IP_TTL, ttl)



      recv_socket.bind(("", port))

      send_socket.sendto("", (dest_name, port))



      ttl +=1



      # ... open connections ...

      # ... print data ...

      # ... break if useful ...      

      pass



if __name__ == '__main__':

      main()