added httpd.pl, sample http server

httpd.pl

@@ -0,0 +1,93 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings "all";
+use Fcntl;
+use IO::Socket::INET;
+
+sub parser($);
+sub trim($);
+# auto-flush on socket
+$| = 1;
+
+# creating a listening socket
+my $socket = new IO::Socket::INET (
+	LocalHost => '127.0.0.1',
+	LocalPort => '1488',
+	Proto => 'tcp',
+	Listen => 5,
+	Reuse => 1
+);
+
+die "cannot create socket $!\n" unless $socket;
+print "server waiting for client connection on port 7777\n";
+
+while(1)
+{
+	# waiting for a new client connection
+	my $client_socket = $socket->accept();
+
+	# get information about a newly connected client
+	my $client_address = $client_socket->peerhost();
+	my $client_port = $client_socket->peerport();
+	print "connection from $client_address:$client_port\n";
+
+	# read up to 4096 characters from the connected client
+	my $data = "";
+
+	$client_socket->recv($data, 4096);
+
+	print "received data: $data\n";
+
+	my $str = parser($data);
+	# write response data to the connected client
+	$data  = "HTTP/1.1 200 OK\n";
+	$data .= "Content-Type: text/plain\n";
+	$data .= "Connection: close\n\n";
+	$data .= $str;
+
+	$client_socket->send($data);
+
+	# notify client that response has been sent
+	shutdown($client_socket, 1);
+}
+
+$socket->close();
+
+sub parser($) {
+	my $data = shift;
+#	return undef if (($data !~ /\r\n\r\n$/) or ($data !~ /\n\n$/));
+	my @headers = (split/\n/, $data);
+	my $hostname = '';
+	my $param = '';
+	my $mesg = 'You requested ';
+
+	foreach (@headers) {
+		my($key, $value) = split(/:\s+/, trim($_));
+		next unless(defined($key));
+
+		if ($key =~ /^HOSTNAME$/i) {
+			$hostname = $value;
+		}
+
+		if ($key =~ /^RTT$/) {
+			$param = $value;
+		}
+
+		if ($key =~ /^LOSS$/) {
+			$param = $value;
+		}
+
+	}
+
+	return "$mesg $hostname $param\n";
+}
+
+sub trim ($) {
+	my $param = shift;
+	if ($param =~ /^(\n|\r)/) {$param = substr($param, 1); }
+	if ($param =~ /^(\n|\r)/) {$param = substr($param, 1); }
+	if ($param =~ /(\n|\r)$/) { chop($param); }
+	if ($param =~ /(\n|\r)$/) { chop($param); }
+	return $param;
+}