php exec, sudo....

[sojic]

I have some problem with php function exec.

I'm trying to execute


exec("whoami");
echo exec("whoami");
....



but, I do not "receive" anything. Also I should use sudo.

I have /root/start, /root/stop

#!/bin/sh
#touch /var/lock/subsys/local
# Firewall za port forward
iptables -I FORWARD -p tcp -s $1 -d 192.168.168.2 -j ACCEPT


I should execute from php:

exec("sudo /root/start ".$_SERVER['REMOTE_ADDR']);


So... exec do not work, and how to set "sudo with apache"

[till]

Exec is not returnung any output. Please take a look in the php documentation, there are other functions like system and passthru that give you the output back.

[Leszek]

For example shell_exec:

<?php
$output = shell_exec('ls -lah');
echo "<pre>$output</pre>";
?>



Functions mentioned in this thread are often blocked by admins because they can be dangerous for the server. It's ok as long as You run them on Your own server without such restrictions.

[sojic]

Still same problem, I get only <pre></pre>

[Leszek]

Make sure that "shell_exec" isn't disabled on Your server.

[sojic]

How to check it?

[Leszek]

Create a test page in document_root with <?php phpinfo(); ?> as the content and look for "disable_functions" in "PHP Core" section after opening it in the browser. It contains the names of blocked functions.

[sojic]

This is result:


disable_functions no value no value

[falko]

Please make sure that PHP Safe Mode is disabled.