I'm writing a (proxy) server in Perl that is a kind of TCP tunnel, but will work with IPv6. It will:
- connect to an IPv6-connected server (IRC or SMTP for example)
- a client will communicate with our server, which transparently proxies all data (in real-time, no buffering) to the "real" server

Here is the code I have so far (at the moment, the client is just the STDIN and STDOUT filehandles), but I can't get it to even print out what the remote server is saying! 

use Socket;
use Socket6;
use IO::Select;

$| = 1;
my($host,$port) = ("irc.weblook2k.com",6667);

@res = getaddrinfo($host, $port, AF_UNSPEC, SOCK_STREAM);
$family = -1;
($family, $socktype, $proto, $saddr, $canonname, @res) = @res;
($host, $port) = getnameinfo($saddr, NI_NUMERICHOST | NI_NUMERICSERV);
socket(SOCK, $family, $socktype, $proto);
connect(SOCK, $saddr) or die("connect error!");

my $s = new IO::Select();
$s->add(\*STDIN);
$s->add(\*SOCK);

while(1) {
  my $rh_set = IO::Select->select($s, $s, undef, 0.1);
  my $rh;
  foreach $rh (@$rh_set) {
    if($rh == $s) {
      $ns = $rh->accept();
      $s->add($ns);
    } else {
      # read data
      $buf = <$rh>; # should use sysread() maybe?
      if($buf) {
        print STDOUT $buf;
      } else {
        $rh_set->remove($rh);
        close($rh);
      }
    }
  }
}

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So, when something is entered in STDIN, it should be sent to the server, when the server sends something, it should be printed to STDOUT. Any help, code :), tips would be greatly appreciated!

In reply to IO::Select client and server in one by amir

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