#!/usr/bin/perl -w
# server0.pl
#--------------------

use strict;
use Socket;

# use port 7890 as default
#my $port = shift || 7890;
my $port = 80;
my $proto = getprotobyname('tcp');
my $logfile = "/tmp/logfile";

# create a socket, make it reusable
socket(SERVER, PF_INET, SOCK_STREAM, $proto) or die "socket: $!";
setsockopt(SERVER, SOL_SOCKET, SO_REUSEADDR, 1) or die "setsock: $!";

# grab a port on this machine
my $paddr = sockaddr_in($port, INADDR_ANY);

# bind to a port, then listen
bind(SERVER, $paddr) or die "bind: $!";
listen(SERVER, SOMAXCONN) or die "listen: $!";
print "SERVER started on port $port\n";

# accepting a connection
my $client_addr;
while ($client_addr = accept(CLIENT, SERVER)) {
        # find out who connected
        my ($client_port, $client_ip) = sockaddr_in($client_addr);
        my $client_ipnum = inet_ntoa($client_ip);
        my $client_host = gethostbyaddr($client_ip, AF_INET);
        # print who has connected
        open(OUT, ">$logfile");
        print OUT "got a connection from: $client_host", "[$client_ipnum]\n";
        close(OUT);
        # send them a message, close connection
        #print CLIENT "Smile from the server";
        close CLIENT;
}