check if function exists "exec()"

[olaf]

Hello,

I have a script which uses if available the function exec() like:

exec("whois -h whois.crsnic.net  \"domain.com\"", $buffer);

or if the server is a windows type or in case of that the command line is not accessible:

function get_whois_data($test_server, $test_domain) {
	$msg = "";
	$connection = fsockopen($test_server, 43, $errno, $errstr, 10);
	if (!$connection) {
		$msg = "Can't connect to the server!";
	} else {
		sleep(2);
		fputs($connection, $test_domain."\r\n"); 
		while (!feof($connection)) {
			$msg .= fgets($connection, 4096);
		}
		fclose($connection);
	}
	return $msg;
}

I think that "function_exits()" will work but what if "safe_mode_exec_dir" is set to some value?

[olaf]

Hello,

anyone with an idea here?

[tekky]

<?php
$dir = get_cfg_var('safe_mode_exec_dir');
if (!empty($dir))
	echo 'exec_dir is set to: '. $dir;
else
	echo 'exec_dir is not set...';
?>

example here...

sometimes searching PHP.net will answer all your questions.... took me 5 minutes...

obviously you will want to check if safe_mode is on first..

[olaf]

Hi thanks, I read the manual every day...(not the whole one) ;-)

... but back to my question, first I check if safe_mode is "on" and then if this is true then I have to check that the script is inside a existing safe_mode_exe_dir?

Looks to me like a very strange and extensive check... what do you think? (think about the function I wan't to use)

[tekky]

olaf wrote:

Hi thanks, I read the manual every day...(not the whole one) ;-)

... but back to my question, first I check if safe_mode is "on" and then if this is true then I have to check that the script is inside a existing safe_mode_exe_dir?

Looks to me like a very strange and extensive check... what do you think? (think about the function I wan't to use)

If you prefer using exec() over your back up method, then its exactly as "strange and extensive" as it has to be...

or you can setup error_handling and call exec everytime and on error, use the backup method... either way, its "strange and extensive"

[olaf]

stop stop... you understand me wrong ;-)

I have a script where I can switch between both methods (the one the other). I'm looking for a simple where to put there some automatisation. (to stop getting questions from people who doesn't know)

[tekky]

olaf wrote:

stop stop... you understand me wrong ;-)

I have a script where I can switch between both methods (the one the other). I'm looking for a simple where to put there some automatisation. (to stop getting questions from people who doesn't know)

Well unless you know of a simpler way, the get_cfg_var() is the easiest way I know... OTHER then trapping errors and doing it that way... I would prefer the get_cfg_var() method as it doesnt DEPEND on trapping a mistake...

[olaf]

But you understand what I try to do?

I have this situation at the moment:

class SIDN_contract extends fpdi {

var $os_system = "linux"; // change this to "win" for windows hosts

function get_whois_data() {
	$buffer = "";
	$domein = $this->domain.".nl";
	if ($this->os_system == "win") {
		$connection = @fsockopen("whois.domain-registry.nl", 43);
		if (!$connection) {
			return;
		} else {
			fputs($connection, "is ".$domein); 
			while (!feof($connection)) {
				$buffer .= fgets($connection, 4096);
			}
			fclose($connection);
		}
	} else {
		$string = "whois -h whois.domain-registry.nl \"is ".$domein."\""; 
		exec($string, $buffer);
	}
	if ($buffer != "") {
		if (eregi("is free", $buffer)) {
			return true;
		} else {
			return false;
		}
	} else {
		$this->message[] = $this->message_strings(12);
	}
}
     // the other code
}

I want to automate this function/method...
Does it make sense to check the for this purpose?

Thanks for your advice until now.

[olaf]

oooh...
by the way if I check only with function_exists does it be enough?

If someone placed this script outside the safe_mode_exe_dir the exec() function is not available. In this case I should give the advice to place the script in the right directory to raise the performance, what do you think?

[tekky]

might work, try it and see, as far as understanding you, yes and the answer is still the same

[olaf]

I think I know what I do I check both and inform the user if the exec() function is only possible inside his safe_mode dirs. Thanks, you helped me a lot ...