#!/usr/bin/perl -w
use IO::Socket;
use Net::hostent;      # for OO version of gethostbyaddr

$PORT = 9000;       # pick something not in use

$server = IO::Socket::INET->new( Proto     => 'tcp',
   LocalPort => $PORT,
   Listen    => SOMAXCONN,
   Reuse     => 1);

die "can't setup server" unless $server;
print "[Server $0 accepting clients]\n";

while ($client = $server->accept()) {
   $client->autoflush(1);
   print $client "Welcome to $0; type help for command list.\n";
   $hostinfo = gethostbyaddr($client->peeraddr);
   my $response = $hostinfo ? $hostinfo->name : $client->peerhost;
   printf "[Connect from %s]\n", $response;
   print $client "Command?\n";
   while ( <$client>) {
      next unless /\S/;       # blank line
      if    (/quit|exit/i)    { last;                                   }
      elsif (/date|time/i)    { print  $client "SELECTED: date/time\n"; }
      elsif (/who/i )         { print  $client "SELECTED: who\n";       }
      elsif (/cookie/i )      { print  $client "SELECTED: cookie\n";    }
      elsif (/motd/i )        { print  $client "SELECTED: motd\n";      }
      else {
         print $client "Commands: quit date who cookie motd\n";
      }
   } continue {
      print $client "Command?\n";
   }
   close $client;
}