1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
#!/usr/bin/env python
import random, 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 xrange(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,
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()
|
