Jump to content

http and game server status check? (udp problems..)

Bkid

By Bkid
in PHP Coding Help

 Share

Recommended Posts

Bkid Newbie

Bkid

Posted
Posted

Disclaimer: I've been messing around with PHP for a little over a day, so the fact that I've gotten as far as I have is nothing short of a miracle. :P

 

I've tried my best to figure things out on my own, but it's come down to this.. There's a game I play online, and the game server's hostname is the same as the website itself. That's not really the problem, however. I've made a page to check the status of the site + the game server (using different ports), but the game server isn't wanting to play nice (big surprise).

 

I think I've done the website part correctly, although there may been a better way to go about doing it (ping instead?). It seems to work, but then again, the site hasn't been down yet. That being said, I can change it to a made up site and it will say "Offline", so I guess it's ok.

 

The game server part is what gets me. Basically, because of the way the server is, I have to make a UDP connection, send data, and listen for a reply. Based on whether I get a reply or not is how I can tell if it is online or not. The code is currently either not working, or returning false-positives (when the server is actually down, or I change the port to something I know is not open).

 

THE CODE! (I'll just post the whole thing, html and all):

 

<html>
<head>
<title>Server Status</title>
<meta http-equiv="refresh" content="30">
<meta http-equiv="cache-control" content="no-cache">
</head>
<body bgcolor="#212F3A">
<center> 
<font color="white"><h1>Server Status:</h1></font>
<br />
<?php
$host = "example.com";
$port = "80"; 
$port2 = "7500";
echo '<FONT COLOR=white>Website Status:</FONT> ';
if (!$sitestatus = @fsockopen($host, $port, $num, $error, 10)) 
echo '<B><FONT COLOR=red>Offline</b></FONT>'; 
else{ 
echo '<B><FONT COLOR=lime>Online</b></FONT>'; 
fclose($sitestatus);
}
echo '<br />';
echo '<FONT COLOR=white>MTSP Status:</FONT> ';
$fp = @fsockopen("udp://$host", $port2, $num, $error, 10);
if($fp = @fsockopen("udp://$host", $port2, $num, $error, 10) && fwrite($fp, "0")) {
echo '<B><FONT COLOR=lime>Online</b></FONT>';
}
else {
echo '<B><FONT COLOR=red>Offline</b></FONT>';
}
/* Another way I was trying to do it...
$fp = @fsockopen("udp://$host", $port2, $num, $error, 10);
if(!$fp = @fsockopen("udp://$host", $port2, $num, $error, 10) && !fwrite($fp, "0")) {
     echo 'Not Connected';
}
else {
     echo 'Connected';
 $reply = fread($fp, 30);
 echo '<br>Server reply was: $reply';
 fclose($fp);
} */
echo '<br /><br />';
echo '<FONT COLOR=white>(This page will automatically refresh every 30 seconds.)</FONT>';
?>
</body>
</html>

 

 

Here is a portion of the code from the server it's trying to connect to, which I think I can use to check it's status:

 

		switch(rcv[0]){
	case PH_PING:
		rcv[0] = PH_PONG;
		UDP->Send(rcv, rcv->Length, ep);
		break;

	case PH_PONG:
		if(rcv->Length == 1 && Ping > 0){
			form->WriteMessage(String::Format("Ping : {0}ms\n", timeGetTime() - Ping), SystemMessageColor);
			Ping = 0;
		}
		break;

 

My questions:

  • How do I send data to the server, and how do I listen for a reply and act upon it?
  • Is meta-refresh necessary to make sure the page isn't showing the server offline when it's actually not (or vice versa)?
  • Is cache-control necessary, or is the script going to re-run each time, producing the correct results (I think it's not necessary, but I'm not sure..)?

 

 

Phew, that was a lot..Anyway, I think that's about it, and I'll edit my post if it isn't. :P

Thanks for any help! :D

Christian F. Member

Christian F.

Posted
Posted

I've modified your script a bit, to show you a more flexible way of doing things. Also, added some error checking, and comments.

<?php

$host = "example.com";
$port = "80";
$port2 = "7500";

/**
* Check if a game's website and server is running, and returns an array with the results.
* 
* @param string $host
* @param int $webPort
* @param int $gamePort
* @return array
*/
function check_game ($host, $webPort, $gamePort) {
// Open a cURL request to the web server, and retrieve header data.
$cReq = curl_init ('http://'.$host);
curl_setopt ($cReq, CURLOPT_HEADER, true);

// Check if the server returned 200 (OK).
if (curl_getinfo ($cReq, CURLINFO_HTTP_CODE) == 200) {
	$siteStatus = 'online';
} else {
	$siteStatus = 'offline';
}

// Open a connection to the game server, and request its status.
$fp = fsockopen ("udp://$host", $gamePort, $num, $error, 10);
if (!$error) {
	// TODO: Add status request payload.
	fwrite ($fp, "0");
}

// Read the reply from the server, if we get something we're good.
if (!$error && fread ($fp, 1024)) {
	$gameStatus = 'online';
} else {
	$gameStatus = 'offline';
}

// Return the status messages.
return array ($siteStatus, $gameStatus);
}

$status = check_game ($host, $port1, $port2);
$status = <<<OutHTML
<dl>
<dt>Website status:</dt>
<dd>{$status[0]}</dd>
<dl>MTSP status:</dl>
<dd>{$status[1]}</dd>
</dl>
OutHTML;

?>

<html>
<head>

<title>Server Status</title>

<meta http-equiv="refresh" content="30">
<meta http-equiv="cache-control" content="no-cache">

</head>
<body>

<h1>Server Status:</h1>
<?php echo $status; ?>

<p class="footer">(This page will automatically refresh every 30 seconds.)</p>

</body>
</html>

 

For styling the HTML elements, you'll want to use CSS. It's a much better way, and by writing standard compliant HTML you will save yourself from a lot of headaches. (Note that the HTML above is not quite standards compliant yet, you're missing a doctype and possibly a content header.)

 

If I've used something you don't understand, I recommend looking at the PHP manual for more information. Should you still have some question after reading the manual, and playing around with the code for a bit, please let me/us know.

 

The meta-refresh isn't the only way to solve it, but it's the simplest way to accomplish what you want. Another way of doing it is AJAX (use jQuery), but that is a lot more technically advanced. So I'd work on the basics a bit more, before venturing there, if I were in your shoes. ;)

 

Cache-control shouldn't be necessary, but it never hurts to be on the safe side.

 

In closing: Excellent first post. :)

Bkid Newbie

Bkid

Posted
  • Author
Posted

Thanks a bunch! I'm not on my computer right now, but I'll edit my index file and uploaded it to see how it works out. I haven't used html in forever, and I'm extremely new to php, but I'm getting there. :P I didn't really care about the html and standard compliance too much, since it was just a simple little server status page, but I might clean it up later. I'm trying to teach myself a little bit right now, and after I graduate for networking I'll probably go back for programming. ;)

 

Again, thanks so much for helping me out with this. I'll be testing it soon.

Bkid Newbie

Bkid

Posted
  • Author
Posted

I just tried the code, and it wasn't really working out as planned at first. The website was coming back offline, even though it wasn't. I added the following to test it:

 

$httpstatus = curl_getinfo ($cReq, CURLINFO_HTTP_CODE);
echo 'Server status code: ' . $httpstatus;

 

I found that it was returning 0, and that was not good at all.

 

I did some research, and rewrote some of it as the following:

 

<?php
$host = "example.com";
$port = "80";
$port2 = "7500";
function check_game ($host, $webPort, $gamePort) {
// WEBTSITE STATUS
$cReq = curl_init ('http://'.$host);
curl_setopt ($cReq, CURLOPT_HEADER, true);
curl_setopt($cReq, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($cReq, CURLOPT_CONNECTTIMEOUT, 5);
curl_exec($cReq);
$httpcode = curl_getinfo ($cReq, CURLINFO_HTTP_CODE);
if (curl_getinfo ($cReq, CURLINFO_HTTP_CODE) == 200) {
	//The end part on each one below was only there for testing.
	$siteStatus = "<B><FONT COLOR=lime>Online </b></FONT>(" . $httpcode . " was returned correctly.)";
} else {
	$siteStatus = "<B><FONT COLOR=red>Offline (</b></FONT>(" . $httpcode . " was returned instead of 200.)";
}
curl_close($cReq);

// GAME SERVER STATUS
// Open a connection to the game server, and request its status.
$fp = fsockopen ("udp://$host", $gamePort, $num, $error, 5);
if (!$error) {
	// TODO: Add status request payload.
	fwrite ($fp, "0");
}
// Read the reply from the server, if we get something we're good.
if (!$error && fread ($fp, 1024)) {
	$gameStatus = '<B><FONT COLOR=lime>Online</b></FONT>';
} else {
	$gameStatus = '<B><FONT COLOR=red>Offline</b></FONT>';
}
fclose($fp);
// Return the status messages.
return array ($siteStatus, $gameStatus);
}

$status = check_game ($host, $port1, $port2);
$status = <<<OutHTML
Website status: {$status[0]}
<br />
MTSP status: {$status[1]}
OutHTML;

?>

<html>
<head>

<title>Server Status</title>

<meta http-equiv="refresh" content="30">
<meta http-equiv="cache-control" content="no-cache">

</head>
<body bgcolor="#212F3A">
<center> 
<font color="white"><h1>Server Status:</h1>
<br />
<?php echo $status;?>
<p class="footer">(This page will automatically refresh every 30 seconds.)</p></font></center>

</body>
</html>

 

 

The game server part still doesn't seem to work correctly, although I'm not sure why. :(

This thread is more than a year old. Please don't revive it unless you have something important to add.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.