Checking For Open Ports From Php If you want to check the status of a server at a specific port you can

[NeOniX 0]

Some days ago, i needed to check ports of a server from a webpage, for advising of its status.

I simply used a great php code that's fsockopen. I'll explain it in the following example:

 

(Imagine a file called 'checkports.php', containing the next)

<?$address =" Xisto.com"; //Here you can specify the address you want to check ports$port = "80"; //Here you can specify the port you want to check from $address$checkport = fsockopen($address, $port, $errnum, $errstr, 2); //The 2 is the time of ping in secs//Here down you can put what to do when the port is closedif(!$checkport){	   echo "The port ".$port." from ".$address." seems to be closed.";  //Only will echo that msg}else{//And here, what you want to do when the port is open	   echo "The port ".$port." from ".$address." seems to be open."; //The msg echoed if port is open}?>

Well, that's all, but you can do with it a lot of interesting stuff, i.e., you put that on a host with PHP, and check if another host is up, and it is, redirect to... etc.

 

Enjoy!

Edited June 17, 2006 by NeOniX (see edit history)

[uiop 0]

Awsome code! Thanks a ton for it! I'm not really sure what I can use it for, but it sounds cool!Do you need any special server permissions to run this script? Will it run on all servers?

[NeOniX 0]

Do you need any special server permissions to run this script? Will it run on all servers?

Lol er... well dunno if all servers let u using fsockopen(), cuz i actually use my own server, so i suppose it depends of the host. You could post a topic on a forum askin' 4 that.
Anyway, yesterday i try to use on a free hosting server with PHP, and it gave me back an error like 'Due to security reasons...'

(note: tried out in Xisto hosting and works)
Edited July 7, 2006 by NeOniX (see edit history)

[masterio 0]

Well, i didnt know if Xisto.com disable some function like fsockopen(), shell_exec(), passthru(), and many other PHP function to communicate with filesystem. I think it may be disable for security reason...! . By the way fsockopen() is usefull for grabbing page, etc besid file_get_contents() function.

[iGuest 3]

Thnk you very muchI appreciate B)but maybe you have this error:"A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond"that because you have to put error handler

[iGuest 3]

Sometime we need to find next available free port on which we can start a service.

The following code can be used to get next available free port between 8000 - 1000, you can change the range!

function get_next_free_port() {	for($i=8000; $i<=10000; $i++) {		$conn = @fsockopen("localhost", $i);		if ($conn) {			fclose($conn);		}		else {			return $i;		}	}  }

I just extended the above code, so that it could help newbie like me J

Thanks,
Sachin.
Edited June 15, 2012 by moderator (see edit history)