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Andreas Jaggi revised this gist . Go to revision
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nflog_sniffer.pl(file created)
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| 1 | + | #!/usr/bin/perl | |
| 2 | + | # | |
| 3 | + | # Written by Andreas Jaggi <andreas.jaggi@waterwave.ch> in December 2015 | |
| 4 | + | # | |
| 5 | + | ||
| 6 | + | use strict; | |
| 7 | + | use warnings; | |
| 8 | + | ||
| 9 | + | use nflog; | |
| 10 | + | use NetPacket::IP qw(IP_PROTO_UDP); | |
| 11 | + | use NetPacket::UDP; | |
| 12 | + | use Socket qw(AF_INET AF_INET6); | |
| 13 | + | use Net::DNS::Packet; | |
| 14 | + | ||
| 15 | + | my $l; | |
| 16 | + | ||
| 17 | + | sub callback { | |
| 18 | + | my ($payload) = @_; | |
| 19 | + | if ($payload) { | |
| 20 | + | my $ip_obj = NetPacket::IP->decode($payload->get_data()); | |
| 21 | + | if ($ip_obj->{proto} == IP_PROTO_UDP) { | |
| 22 | + | my $packet = new Net::DNS::Packet(\NetPacket::UDP->decode($ip_obj->{data})->{data}); | |
| 23 | + | if($packet->header->qr){ | |
| 24 | + | foreach my $answer ( $packet->answer ) { | |
| 25 | + | print "answer(".$answer->type.")[".$answer->ttl."]: ".$answer->name." -> ".$answer->rdstring."\n"; | |
| 26 | + | } | |
| 27 | + | } | |
| 28 | + | } | |
| 29 | + | } | |
| 30 | + | return 0; | |
| 31 | + | } | |
| 32 | + | ||
| 33 | + | sub cleanup { | |
| 34 | + | $l->unbind(AF_INET); | |
| 35 | + | $l->close(); | |
| 36 | + | } | |
| 37 | + | ||
| 38 | + | sub main { | |
| 39 | + | $l = new nflog::log(); | |
| 40 | + | $SIG{INT} = "cleanup"; | |
| 41 | + | $l->set_callback(\&callback); | |
| 42 | + | $l->fast_open(123,AF_INET); | |
| 43 | + | $l->try_run(); | |
| 44 | + | } | |
| 45 | + | ||
| 46 | + | main(); | |
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