x-way revised this gist . Go to revision
No changes
Andreas Jaggi revised this gist . Go to revision
1 file changed, 39 insertions
nflog_sniffer.py(file created)
| @@ -0,0 +1,39 @@ | |||
| 1 | + | #!/usr/bin/python | |
| 2 | + | # | |
| 3 | + | # Written by Andreas Jaggi <andreas.jaggi@waterwave.ch> in December 2015 | |
| 4 | + | # | |
| 5 | + | ||
| 6 | + | from socket import AF_INET, AF_INET6, inet_ntop | |
| 7 | + | ||
| 8 | + | import nflog | |
| 9 | + | ||
| 10 | + | from dpkt import ip, dns | |
| 11 | + | ||
| 12 | + | def callback(payload): | |
| 13 | + | pkt = ip.IP(payload.get_data()) | |
| 14 | + | if pkt.p == ip.IP_PROTO_UDP: | |
| 15 | + | pack = dns.DNS(pkt.udp.data) | |
| 16 | + | if pack.qr == dns.DNS_R: | |
| 17 | + | for rr in pack.an: | |
| 18 | + | if rr.type == dns.DNS_A: | |
| 19 | + | print "answer(%s)[%d]: %s" % (rr.name, rr.ttl, inet_ntop(AF_INET,rr.ip)) | |
| 20 | + | if rr.type == dns.DNS_AAAA: | |
| 21 | + | print "answer(%s)[%d]: %s" % (rr.name, rr.ttl, inet_ntop(AF_INET6,rr.ip6)) | |
| 22 | + | if rr.type == dns.DNS_CNAME: | |
| 23 | + | print "answer(%s)[%d]: %s" % (rr.name, rr.ttl, rr.cname) | |
| 24 | + | ||
| 25 | + | ||
| 26 | + | def main(): | |
| 27 | + | l = nflog.log() | |
| 28 | + | l.set_callback(callback) | |
| 29 | + | l.fast_open(123,AF_INET) | |
| 30 | + | try: | |
| 31 | + | l.try_run() | |
| 32 | + | except KeyboardInterrupt, e: | |
| 33 | + | print "interrupted, terminating..." | |
| 34 | + | l.unbind(AF_INET) | |
| 35 | + | l.close() | |
| 36 | + | ||
| 37 | + | ||
| 38 | + | if __name__ == "__main__": | |
| 39 | + | main() | |
Newer
Older