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Use Webpage to Start Script

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# 1  
Old 04-03-2012
Use Webpage to Start Script
I apologize if this is in the incorrect section, I'm not quite sure which section it should go in.

Anyways...
I've got a script that I'd like to be able to start with a webpage, something that just has a button that says "Start this Bot", which will start the bot and put it in the background. How would I do this/can someone provide me with a simple HTML file that would do this using PHP?

Assume the path is: /home/bots/rcbot.pl
# 2  
Old 04-03-2012
The button and the code will actually be different pages, because when you click the button, that loads a separate, independent webpage, see? Each time you interact with CGI, it's a fresh page. The only things which come with it are things you put in every time.

Have your form load a PHP page with this in it:
Code:
<?php system("nohup /home/bots/rcbot.pl & disown"); ?>

# 3  
Old 04-05-2012
Quote:
Originally Posted by Corona688
The button and the code will actually be different pages, because when you click the button, that loads a separate, independent webpage, see? Each time you interact with CGI, it's a fresh page. The only things which come with it are things you put in every time.

Have your form load a PHP page with this in it:
Code:
<?php system("nohup /home/bots/rcbot.pl & disown"); ?>

I'm sorry, I guess I need to add two more things I forgot...

I need user "bots" to run this (password auth is off, have to use key for authentication), and if possible, it should check to see if the file/bot is already running and if it is, either return an error or kill the process. Is this possible to add to that code that was provided?

---------- Post updated 04-05-12 at 03:24 PM ---------- Previous update was 04-04-12 at 04:31 PM ----------

Is anyone able to help now that I've given a few more specifics? I'm not quite sure how to do this, thanks!
# 4  
Old 04-05-2012
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# 5  
Old 04-05-2012
You'll have to configure sudo to allow you to run the script as another user, since your webserver probably runs as the apache user and group.

Add lines like this using visudo:

Code:
apache ALL = NOPASSWD:(bots) /home/bots/rcbot.pl
apache ALL = NOPASSWD:(bots) kill

Then a php script like:

Code:
<html><body>
<?php   $scr=<<<EOF
        # Let you see errors
        exec 2 > &1
        # Kill old script
        read PID < /tmp/botpid && sudo -u bots kill "\$PID"
        # Run new script
        nohup sudo -u bots /home/bots/rcbot.pl > /dev/null &
        # Save new PID
        echo "$!" > /tmp/botpid
EOF;

        echo "<pre>", $scr, "</pre>";
        system($scr);
        ?>
</body></html>

Since this doesn't do an actual shell login to bots, things like PATH may not be fully set.
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