1#!/usr/bin/perl 2# $OpenBSD: tapdump.pl,v 1.1 2016/09/28 12:40:35 bluhm Exp $ 3 4# Copyright (c) 2014 Alexander Bluhm <bluhm@openbsd.org> 5# 6# Permission to use, copy, modify, and distribute this software for any 7# purpose with or without fee is hereby granted, provided that the above 8# copyright notice and this permission notice appear in all copies. 9# 10# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 18use strict; 19use warnings; 20use Tap 'opentap'; 21 22my $tap = opentap(6) 23 or die "Open tap device 6 failed: $!"; 24 25for (;;) { 26 my $n = sysread($tap, my $buf, 70000); 27 defined($n) or die "sysread failed: $!"; 28 $n or last; 29 print "Read $n bytes\n"; 30 print unpack("H*", $buf), "\n"; 31} 32 33print "Terminating\n" 34