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# $OpenBSD: Relay.pm,v 1.2 2017/11/07 22:06:17 bluhm Exp $
# Copyright (c) 2010-2017 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;
package Relay;
use parent 'Proc';
use Carp;
use Socket qw(IPPROTO_TCP TCP_NODELAY);
use Socket6;
use IO::Socket;
use IO::Socket::INET6;
sub new {
my $class = shift;
my %args = @_;
$args{logfile} ||= "relay.log";
$args{up} ||= "Connected";
$args{forward}
or croak "$class forward not given";
my $self = Proc::new($class, %args);
$self->{protocol} ||= "tcp";
$self->{listendomain}
or croak "$class listen domain not given";
$self->{connectdomain}
or croak "$class connect domain not given";
$self->{connectaddr}
or croak "$class connect addr not given";
$self->{connectport}
or croak "$class connect port not given";
my $ls = IO::Socket::INET6->new(
Proto => $self->{protocol},
ReuseAddr => 1,
Domain => $self->{listendomain},
$self->{listenaddr} ? (LocalAddr => $self->{listenaddr}) : (),
$self->{listenport} ? (LocalPort => $self->{listenport}) : (),
) or die ref($self), " socket failed: $!";
if ($self->{oobinline}) {
setsockopt($ls, SOL_SOCKET, SO_OOBINLINE, pack('i', 1))
or die ref($self), " set oobinline listen failed: $!";
}
if ($self->{sndbuf}) {
setsockopt($ls, SOL_SOCKET, SO_SNDBUF,
pack('i', $self->{sndbuf}))
or die ref($self), " set sndbuf listen failed: $!";
}
if ($self->{rcvbuf}) {
setsockopt($ls, SOL_SOCKET, SO_RCVBUF,
pack('i', $self->{rcvbuf}))
or die ref($self), " set rcvbuf listen failed: $!";
}
if ($self->{protocol} eq "tcp") {
setsockopt($ls, IPPROTO_TCP, TCP_NODELAY, pack('i', 1))
or die ref($self), " set nodelay listen failed: $!";
listen($ls, 1)
or die ref($self), " listen failed: $!";
}
my $log = $self->{log};
print $log "listen sock: ",$ls->sockhost()," ",$ls->sockport(),"\n";
$self->{listenaddr} = $ls->sockhost() unless $self->{listenaddr};
$self->{listenport} = $ls->sockport() unless $self->{listenport};
$self->{ls} = $ls;
return $self;
}
sub child {
my $self = shift;
my $as = $self->{ls};
if ($self->{protocol} eq "tcp") {
$as = $self->{ls}->accept()
or die ref($self), " socket accept failed: $!";
print STDERR "accept sock: ",$as->sockhost()," ",
$as->sockport(),"\n";
print STDERR "accept peer: ",$as->peerhost()," ",
$as->peerport(),"\n";
}
$as->blocking($self->{nonblocking} ? 0 : 1)
or die ref($self), " non-blocking accept failed: $!";
open(STDIN, '<&', $as)
or die ref($self), " dup STDIN failed: $!";
print STDERR "Accepted\n";
if ($self->{clientreadable}) {
my $idle = 15; # timeout
my $rin = '';
vec($rin, fileno($as), 1) = 1;
defined(my $n = select($rin, undef, undef, $idle))
or die ref($self), " select failed: $!";
$idle && $n == 0
and die ref($self), " select timeout";
}
my $cs = IO::Socket::INET6->new(
Proto => $self->{protocol},
Domain => $self->{connectdomain},
Blocking => ($self->{nonblocking} ? 0 : 1),
) or die ref($self), " socket connect failed: $!";
if ($self->{oobinline}) {
setsockopt($cs, SOL_SOCKET, SO_OOBINLINE, pack('i', 1))
or die ref($self), " set oobinline connect failed: $!";
}
if ($self->{sndbuf}) {
setsockopt($cs, SOL_SOCKET, SO_SNDBUF,
pack('i', $self->{sndbuf}))
or die ref($self), " set sndbuf connect failed: $!";
}
if ($self->{rcvbuf}) {
setsockopt($cs, SOL_SOCKET, SO_RCVBUF,
pack('i', $self->{rcvbuf}))
or die ref($self), " set rcvbuf connect failed: $!";
}
if ($self->{protocol} eq "tcp") {
setsockopt($cs, IPPROTO_TCP, TCP_NODELAY, pack('i', 1))
or die ref($self), " set nodelay connect failed: $!";
}
my @rres = getaddrinfo($self->{connectaddr}, $self->{connectport},
$self->{connectdomain}, SOCK_STREAM);
$cs->connect($rres[3])
or die ref($self), " connect failed: $!";
print STDERR "connect sock: ",$cs->sockhost()," ",$cs->sockport(),"\n";
print STDERR "connect peer: ",$cs->peerhost()," ",$cs->peerport(),"\n";
$self->{bindaddr} = $cs->sockhost();
$self->{bindport} = $cs->sockport();
open(STDOUT, '>&', $cs)
or die ref($self), " dup STDOUT failed: $!";
}
1;
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