Fast_reconnect.php
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Authored by Joe on Aug 17 2015, 9:14 AM.

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	F1563078: Fast_reconnect.php
	Aug 17 2015, 9:14 AM

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	<?php
	function timedelta($mend, $mstart) {
	list($uend, $send) = explode(" ", $mend);
	list($ustart, $sstart) = explode(" ", $mstart);
	$sdiff = (float)$send - (float)$sstart;
	$udiff = (float)$uend - (float)$ustart;
	return ($sdiff + $udiff);
	}
	/*
	Let's test what happens to fsockopen if we don't get an answer after sending a SYN
	*/
	$start = microtime();
	$timeout = 0.5;
	$errno=$errstr= null;
	$ips = array('192.168.1.104', '192.168.1.4');
	foreach ($ips as $ip) {
	$s = fsockopen($ip, 22, $errno, $errstr, $timeout);
	if ($s) {
	$end = microtime();
	$tfirst = timedelta($end, $start);
	echo "First socket opened within $tfirst\n";
	fclose($s);
	break;
	}
	}

	$timeout = 0.03; // 30 milliseconds
	$start = microtime();
	foreach ($ips as $ip) {
	$retries = 2;
	for ($i=0; $i<$retries; $i++) {
	$s = fsockopen($ip, 22, $errno, $errstr, $timeout);
	if ($s) {
	$end = microtime();
	$tfirst = timedelta($end, $start);
	echo "Second socket opened within $tfirst\n";
	fclose($s);
	break;
	}
	}
	}
	?>
	joe@test:~$ php test.php
	PHP Warning: fsockopen(): unable to connect to 192.168.1.104:22 (Connection timed out) in /home/joe/test.php on line 17
	First socket opened within 0.508883
	PHP Warning: fsockopen(): unable to connect to 192.168.1.104:22 (Connection timed out) in /home/joe/test.php on line 32
	PHP Warning: fsockopen(): unable to connect to 192.168.1.104:22 (Connection timed out) in /home/joe/test.php on line 32
	Second socket opened within 0.065743

Joe changed the title of this paste from untitled to Fast_reconnect.php.

Joe updated the paste's language from autodetect to autodetect.

Joe added a project: acl*sre-team.

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