Python Traceroute in 40 lines

Hey, found this python code on Ksplice. It's a basic version of traceroute in 20 lines of code, pretty much used for teaching you a bit more about python. Take a look if you're curios (the original site walks you through the creation/learning process):

    #!/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')

Original link: http://blog.ksplice.com/2010/07/learning-by-doing-writing-your-own-trace...