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#!/usr/bin/python | |
import socket | |
import struct | |
import sys | |
# We want unbuffered stdout so we can provide live feedback for | |
# each TTL. You could also use the "-u" flag to Python. | |
class flushfile(file): | |
def __init__(self, f): | |
self.f = f | |
def write(self, x): | |
self.f.write(x) | |
self.f.flush() | |
sys.stdout = flushfile(sys.stdout) | |
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) | |
# Build the GNU timeval struct (seconds, microseconds) | |
timeout = struct.pack("ll", 5, 0) | |
# Set the receive timeout so we behave more like regular traceroute | |
recv_socket.setsockopt(socket.SOL_SOCKET, socket.SO_RCVTIMEO, timeout) | |
recv_socket.bind(("", port)) | |
sys.stdout.write(" %d " % ttl) | |
send_socket.sendto("", (dest_name, port)) | |
curr_addr = None | |
curr_name = None | |
finished = False | |
tries = 3 | |
while not finished and tries > 0: | |
try: | |
_, curr_addr = recv_socket.recvfrom(512) | |
finished = True | |
curr_addr = curr_addr[0] | |
try: | |
curr_name = socket.gethostbyaddr(curr_addr)[0] | |
except socket.error: | |
curr_name = curr_addr | |
except socket.error as (errno, errmsg): | |
tries = tries - 1 | |
sys.stdout.write("* ") | |
send_socket.close() | |
recv_socket.close() | |
if not finished: | |
pass | |
if curr_addr is not None: | |
curr_host = "%s (%s)" % (curr_name, curr_addr) | |
else: | |
curr_host = "" | |
sys.stdout.write("%s\n" % (curr_host)) | |
ttl += 1 | |
if curr_addr == dest_addr or ttl > max_hops: | |
break | |
if __name__ == "__main__": | |
main('google.com') |
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