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#!/usr/bin/perl
# $OpenBSD: tundump.pl,v 1.2 2014/07/11 22:28:51 bluhm Exp $
# Copyright (c) 2014 Alexander Bluhm <bluhm@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
use strict;
use warnings;
use Tun 'opentun';
my $tun = opentun(6)
or die "Open tun device 6 failed: $!";
for (;;) {
my $n = sysread($tun, my $buf, 70000);
defined($n) or die "sysread failed: $!";
$n or last;
print "Read $n bytes\n";
print unpack("H*", $buf), "\n";
}
print "Terminating\n"
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