#TCP/IP Server

use Socket;
use Carp;
$EOL = "\015\012";
sub logmsg { print "$0 $$: @_ at ", scalar localtime, "\n" }

my $port = shift || 10; #待機するポート番号
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;

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";

	#文字の受信
	$line = <Client>; #終端文字(CR)が送られて来るまで待機
	print $line;

	#文字の送信
	print Client "test";
}