Make PHP socket_connect timeout

Question

I have a small application I created to analyze the network connection. It runs from a browser and connects to a local PHP/Apache server. It then asks PHP to send a ping packet through a raw socket. THe problem is that if the host I am trying to ping isn't alive or won't answer to pings, we never get an answer from the server.

I beleave the socket request lives until apache is restarted. I have been getting mixed results from my application lately and I am blaming apache using too many sockets. Currently I have set the AJAX call's timeout and I was happy with it. But I really need to make PHP do the timeouting so that I won't have 500,000 sockets open to an unreachable host.

Some sample code:

$sockconn = @socket_connect($socket, $target, null);
if(!$sockconn)
{
    $raw['error'] = socket_strerror(socket_last_error());
    $raw['status'] = false;
    return $raw;
}

This is the function that won't timeout. I need to get it to timeout. Also PHP script execution time DOES NOT affect sockets.

I am clueless.

Seriously, use fsockopen() instead. It makes a lot of things a lot easier, it is more readily available (it is a core function that must be explicitly disabled, whereas the sockets extension must be explicitly enabled) and the 5th argument lets you define the connect timeout on a per-call basis. — DaveRandom
– DaveRandom, Commented Aug 9, 2012 at 10:52
In theory yes (although with the more advanced stream_socket_* functions rather than fsockopen()). In practice it would be a massive PITA. I sort of assumed you would be dealing with TCP, most of the time that's what people are doing. If what you want is a PHP-driven ICMP echo implementation, though, I've already done that... take a look at this: download.networkm.net/code/php/class.ping.1.0.tar.gz (note that it was written for PHP4, and when my OO skills left... something to be desired, but it does work I have used it a couple of times) — DaveRandom
– DaveRandom, Commented Aug 9, 2012 at 11:04
Oh plus there's a whole bunch of random debugging crap left in there. Just remove lines 291-296 — DaveRandom
– DaveRandom, Commented Aug 9, 2012 at 11:09
New! Improved! Generally easier to use and not quite as crap! download.networkm.net/code/php/class.ping.2.0.tar.gz — DaveRandom
– DaveRandom, Commented Aug 9, 2012 at 14:52
Licensed under LGPL, and to sum up that basically means "Yes, you can use it for whatever you like" :-) — DaveRandom
– DaveRandom, Commented Aug 9, 2012 at 19:20

Sjoerd · Accepted Answer · 2012-08-10 10:47:04Z

15

You can set timeouts for reading and sending using the following options:

socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array('sec' => 1, 'usec' => 0));
socket_set_option($socket, SOL_SOCKET, SO_SNDTIMEO, array('sec' => 1, 'usec' => 0));

Alternatively, you can use non-blocking sockets and periodically poll the socket to see if the remote host responded.

answered Aug 10, 2012 at 10:47

Sjoerd

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Sjoerd · Accepted Answer · 2012-08-09 10:50:19Z

0

Try setting default_socket_timeout.

answered Aug 9, 2012 at 10:50

Sjoerd

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