The plugproxy web page isn't working right now, so I'm not sure what functionality it offers. Here is my own very simple utility that does TCP port forwarding, but it doesn't have any logging or tracing features. But it should be easy enough to add.

#!perl -w
# usage: portforward configfile
# configfile has lines like this:
#18025 mail.messagingengine.com:25
#18110 mail.messagingengine.com:110
#where 18025 is the TCP port on the local machine and 
#  mail.messagingengine.com:25
#is where that port is forwarded to.

use Socket;
use IO::Socket;
use IO::Select;
use strict;

$| = 1;
my %ports;
my $listen_set =  IO::Select->new();


$SIG{CHLD} = 'IGNORE';

while (<>) {
  chomp;
  my ($localport, $remotehost) = split;
  $ports{$localport} = $remotehost;
  print "config $localport -> $remotehost\n";
  my $socklisten = IO::Socket::INET->new(LocalPort => $localport,
                                   Listen   => 2,
                                   Reuse   => 1,
                                   Proto    => 'tcp')
                         or die "Cannot open sock on $localport: $!\n"
+;
 $listen_set->add($socklisten);
}

my @ready;
print "Parent ready to accept\n";
while (1) {
  @ready = $listen_set->can_read;
  for my $socklisten (@ready) {
    my $socklocal = $socklisten->accept;
    if (defined $socklocal) {
      my ($port, $myaddr) = sockaddr_in(getsockname($socklisten));
      print "accepted on $port\n";
      my $remotehost = $ports{$port};
      if (! defined($remotehost)) {
        print "Internal error on port $port\n";
        die;
      }
      if (fork()) {
        close($socklocal);
      } else {
        close($socklisten);
        my $sockremote = IO::Socket::INET->new(
            Proto     => "tcp",
            PeerAddr  => "$remotehost",
            Timeout   => 30,
         )
         or die "cannot create socketremote($remotehost): $!\n";
         my $buf= ' 'x4096;
         if (fork()) {
           my $sent = 0;
           while (sysread($socklocal,  $buf, 4096)) {
             print $sockremote $buf;
             $sent += length($buf);
           }
           # print "Total bytes sent $sent\n";
         } else {
           my $rcvd = 0;
           while(sysread($sockremote, $buf, 4096)) {
             print $socklocal  $buf;
             $rcvd += length($buf);
           }
           # print "Total bytes rcvd: $rcvd\n";
         }
         exit(0);
      }
    }
  }
}
print "End of parent: $!\n";
__END__
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