Ksplice.com has put together a tutorial on how to write the traceroute/tracert application in Python in just 8 easy steps. This is a good introduction on how the traceroute application works and socket programming in Python.
Here is the finished product but please read thier post to see all of the steps.
#!/usr/bin/python import socket def main(dest_name): dest_addr = socket.gethostbyname(dest_name) port = 33434 max_hops = 30 icmp = socket.getprotobyname('icmp') udp = socket.getprotobyname('udp') ttl = 1 while True: recv_socket = socket.socket(socket.AF_INET, socket.SOCK_RAW, icmp) send_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, udp) send_socket.setsockopt(socket.SOL_IP, socket.IP_TTL, ttl) recv_socket.bind(("", port)) send_socket.sendto("", (dest_name, port)) curr_addr = None curr_name = None try: _, curr_addr = recv_socket.recvfrom(512) curr_addr = curr_addr[0] try: curr_name = socket.gethostbyaddr(curr_addr)[0] except socket.error: curr_name = curr_addr except socket.error: pass finally: send_socket.close() recv_socket.close() if curr_addr is not None: curr_host = "%s (%s)" % (curr_name, curr_addr) else: curr_host = "*" print "%d\t%s" % (ttl, curr_host) ttl += 1 if curr_addr == dest_addr or ttl > max_hops: break if __name__ == "__main__": main('google.com')
