How to pass variable to exec command in php script?

[shams]

I want to get the values of variables from html form and then pass to the command of exec function in the php script, but it is not working:

 

<?php

    $host = $_POST['localhost'];

    exec ("echo "My host name is"  $host ");

?>
 

 

[Ch0cu3r]

What do you need to use exec for?

 

If you want to display what the user entered use.

<?php

if(isset($_POST['submit']))
{
    $host = $_POST['host'];
    echo "My hostname is $host";
}

?>
<form mehtod="post">
   Hostname: <input type="text" name="host" />
   <input type="submit" name="submit" />
</form>

Edited November 20, 2013 by Ch0cu3r

[shams]

Thanks for reply, i want to use the variable inside the exec function not for the echo but for ssh just for easy i use the echo command inside the exec function, I will use your script to edit for my need.

Sorry for the inconvinence.

Edited November 20, 2013 by shams

[Ch0cu3r]

Ok. The problem with your code was the quotes

 

exec ("echo 'My host name is $host'");
//OR
exec ("echo \"My host name is $host\"");
//OR
exec ('echo "My host name is '.$host.'"');

[shams]

I want to use with ssh but it didn't get the variable:

 

-L 9001:$host:80

and get this error:

 

[Wed Nov 20 23:18:10.476065 2013] [:error] [pid 4690] [client 192.168.1.2:35511] PHP Parse error:  syntax error, unexpected '$host' (T_VARIABLE) in /home/www/example.net/htdocs/php/ssht.php on line 8, referer: http://example.net/php/index.html

[Ch0cu3r]

DId you even try the three examples I posted?

exec ("echo 'My host name is $host'");
//OR
exec ("echo \"My host name is $host\"");
//OR
exec ('echo "My host name is '.$host.'"');

[shams]

I tried the all 3 above lines one by one and no one work and this is the script i run:

 

<?php

    $host = $_POST['localhost'];

   exec ("echo 'My host name is $host'");
  

?>

and these are the errors from apache log for the all 3 above lines one by one:

 

[Thu Nov 21 05:17:11.159618 2013] [mpm_prefork:notice] [pid 2749] AH00163: Apache/2.4.6 (Ubuntu) PHP/5.5.3-1ubuntu2 configured -- resuming normal operations
[Thu Nov 21 05:17:11.295630 2013] [core:notice] [pid 2749] AH00094: Command line: '/usr/sbin/apache2'
[Thu Nov 21 05:22:17.744680 2013] [:error] [pid 3410] [client 192.168.1.2:45137] PHP Notice:  Undefined index: localhost in /home/www/example.net/htdocs/php/t1.php on line 3
[Thu Nov 21 05:22:17.744768 2013] [:error] [pid 3410] [client 192.168.1.2:45137] PHP Stack trace:
[Thu Nov 21 05:22:17.744781 2013] [:error] [pid 3410] [client 192.168.1.2:45137] PHP   1. {main}() /home/www/example.net/htdocs/php/t1.php:0
[Thu Nov 21 05:25:08.683203 2013] [:error] [pid 3411] [client 192.168.1.2:45142] PHP Notice:  Undefined index: localhost in /home/www/example.net/htdocs/php/t1.php on line 3
[Thu Nov 21 05:25:08.683268 2013] [:error] [pid 3411] [client 192.168.1.2:45142] PHP Stack trace:
[Thu Nov 21 05:25:08.683287 2013] [:error] [pid 3411] [client 192.168.1.2:45142] PHP   1. {main}() /home/www/example.net/htdocs/php/t1.php:0
[Thu Nov 21 05:33:58.989598 2013] [:error] [pid 3413] [client 192.168.1.2:45191] PHP Notice:  Undefined index: localhost in /home/www/example.net/htdocs/php/t1.php on line 3
[Thu Nov 21 05:33:58.989644 2013] [:error] [pid 3413] [client 192.168.1.2:45191] PHP Stack trace:
[Thu Nov 21 05:33:58.989668 2013] [:error] [pid 3413] [client 192.168.1.2:45191] PHP   1. {main}() /home/www/example.net/htdocs/php/t1.php:0
 

Edited November 21, 2013 by shams

[brandon66]

Try this maybe?

<?php

if(isset($_POST['host']))
{
    $host = htmlspecialchars($_POST['host']);
    echo "My hostname is" . $host;
}else{
    echo "Not receiving POST variable";
}

?>

Otherewise it seems like your locahost or host variable is not getting set.

Edited November 21, 2013 by brandon66

[shams]

This is the output:

 

Not receiving POST variable

This is the apache error.log:

 

[Thu Nov 21 09:00:28.701411 2013] [mpm_prefork:notice] [pid 2746] AH00163: Apache/2.4.6 (Ubuntu) PHP/5.5.3-1ubuntu2 configured -- resuming normal operations
[Thu Nov 21 09:00:28.754984 2013] [core:notice] [pid 2746] AH00094: Command line: '/usr/sbin/apache2

[JIXO]

Why are you trying to echo a string using exec(), exec() will deliver whatever you give to system's shell, try this :

<?php
exec ('reboot');

[shams]

I want to pass the variable $host to the php script:

 

<form mehtod="post"name="ssht" action="ssht.php">
   Hostname: <input type="text" name="host" />
   <input type="submit" name="submit" />
</form>
 

 

<?php

$host = $_POST['localhost'];

 

exec ("sshpass -p my_pass ssh -L 9001:$host:80 user@shell.example.net -N");

 

?>

The above script didn't get the variable $host, with this error of apache log:

 

Wed Nov 20 23:18:10.476065 2013] [:error] [pid 4690] [client 192.168.1.2:35511] PHP Parse error:  syntax error, unexpected '$host' (T_VARIABLE) in /home/www/example.net/htdocs/php/ssht.php on line 8, referer: http://example.net/php/index.html

Edited November 21, 2013 by shams