#!/usr/bin/perl -Tw
use strict;
use Socket;
use Carp;

my $EOL = "\015\012";

sub logmsg { print "$0 $$: @_ at ", scalar localtime, "\n" }

my $port = shift || 2111;
my $proto = getprotobyname('tcp');
$port = $1 if $port =~ /(\d+)/; # untaint port number

socket(Server, PF_INET, SOCK_STREAM, $proto)        
      || die "socket: $!";

setsockopt(Server, SOL_SOCKET, SO_REUSEADDR, pack("l", 1))
      || die "setsockopt: $!";

bind(Server, sockaddr_in($port, INADDR_ANY))
      || die "bind: $!";

listen(Server,SOMAXCONN)
      || die "listen: $!";

logmsg "server started on port $port";

my $paddr;

$SIG{CHLD} = \&REAPER;

while (1) {
    for (;$paddr = accept(Client,Server); close Client) {
        my($port,$iaddr) = sockaddr_in($paddr);
        my $name = gethostbyaddr($iaddr,AF_INET) || 'Unknown';
        my $C = join ('', <Client>);
        logmsg "conn from $name [", inet_ntoa($iaddr), "] port $port";
        print Client "Hi, [$C], it's now ", scalar localtime, $EOL;
	}
}