#!/usr/bin/perl -Tw
    require 5.002;
    use strict;
    BEGIN { $ENV{PATH} = '/usr/ucb:/bin' }
    use Socket;
    use Carp;

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

    my $port = shift || 2347;
    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;

    for ( ; $paddr = accept(Client,Server); close Client) {
        my($port,$iaddr) = sockaddr_in($paddr);
        my $name = gethostbyaddr($iaddr,AF_INET);

        logmsg "connection from $name [", 
                inet_ntoa($iaddr), "] 
                at port $port";

        print Client "Hello there, $name, it's now ", 
                        scalar localtime, "\n";
    }