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#!/usr/bin/env python
from __future__ import print_function
import random
import socket
import dpkt
import ping
class DNSPing(ping.Ping):
def __init__(self):
ping.Ping.__init__(self)
self.op.add_option('-z', dest='zone', type='string',
default=socket.gethostname().split('.', 1)[1],
help='Domain to formulate queries in')
self.op.add_option('-n', dest='hostname', type='string',
help='Query only for a given hostname')
self.op.add_option('-p', dest='port', type='int', default=53,
help='Remote DNS server port')
self.op.add_option('-R', dest='norecurse', action='store_true',
help='Disable recursive queries')
def open_sock(self, opts):
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.connect((opts.ip, opts.port))
sock.settimeout(opts.wait)
return sock
def gen_ping(self, opts):
for i in range(opts.count):
dns = dpkt.dns.DNS(id=i)
if opts.norecurse:
dns.op &= ~dpkt.dns.DNS_RD
if not opts.hostname:
name = '%s.%s' % (str(random.random())[-6:], opts.zone)
else:
name = opts.hostname
dns.qd = [dpkt.dns.DNS.Q(name=name)]
yield str(dns)
def print_header(self, opts):
print('DNSPING %s:' % opts.ip, end='')
if opts.hostname:
print('Name: %s' % opts.hostname)
else:
print('Name: *.%s' % opts.zone)
def print_reply(self, opts, buf, rtt):
dns = dpkt.dns.DNS(buf)
print('%d bytes from %s: id=%d time=%.3f ms' %
(len(buf), opts.ip, dns.id, rtt * 1000))
if __name__ == '__main__':
DNSPing().main()
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