1. import socket
2. import sys
3.  
4. class TraceRoute(object):
5.    
6.     BADDR = "0.0.0.0" # default bind address - (all IPs)
7.     PORT = 33434 # default port
8.     ICMP = socket.getprotobyname('icmp')
9.     UDP = socket.getprotobyname('udp')
10.  
11.     desternation = ""
12.     ttl = 0 # we inrecement this by one each time.    
13.  
14.     # sockets
15.     reciever = None
16.     sender = None
17.  
18.     # finished?
19.     finished = False
20.  
21.     def __init__(self, desternation):
22.         self.desternation = socket.gethostbyname(desternation)
23.        
24.         self.reciever = socket.socket(socket.AF_INET, socket.SOCK_RAW, self.ICMP)
25.         self.sender = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, self.UDP)
26.        
27.         # bind to reciever so we can listen for replies
28.         self.reciever.bind((self.BADDR, self.PORT))
29.  
30.     def next_server(self):
31.         """ Connects to next server 1 hop away from current server (i.e. server[ttl + 1]) """
32.         if self.finished:
33.             # we have nothing to do, just return
34.             return
35.  
36.         # first job increment the ttl on the socket
37.         self.ttl += 1
38.         self.sender.setsockopt(socket.SOL_IP, socket.IP_TTL, self.ttl)
39.        
40.         self.sender.sendto("", (self.desternation, self.PORT))
41.         current_server = self.reciever.recvfrom(512)[1][0] # get 512 bytes from the reciever
42.         self.display(current_server)
43.  
44.         if current_server == self.desternation:
45.             self.finished = True
46.  
47.     def display(self, address):
48.         """ Gets the hostname (if we can) and displays """
49.         try:
50.             name = socket.gethostbyaddr(address)[0]
51.             print "%s) %s (%s)" % (self.ttl, name, address)
52.         except socket.error:
53.             # we couldn't - we'll just tell them the IP address
54.             print "%s) %s" % (self.ttl, address)
55.        
56.     def __del__(self):
57.         """ Be good and close our sockets """
58.         try:
59.             self.reciever.close()
60.         except socket.error:
61.             # already closed
62.             pass
63.  
64.         try:
65.             self.sender.close()
66.         except socket.error:
67.             # already closed
68.             pass
69.  
70. if __name__ == "__main__":
71.     # lets get the address from the commandline args
72.     if len(sys.argv) <= 1:
73.         # nothing been specified
74.         print "You need to give an address"
75.         print "%s <server>" % sys.argv[0]
76.         sys.exit() # we can't do anything.
77.    
78.     tracert = TraceRoute(sys.argv[1])
79.     while not tracert.finished:
80.         tracert.next_server()