This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Executing linux commands with PHP
I have a PHP file that creates an .xfdf file I am wondering if PHP has a way of executing a command like you would type into the terminal window? I have to run the following command when after the .xfdf file is created to generate the .pdf file
pdftk /var/www/pdf/TimeCard.pdf fill_form /var/www/pdf/results/Brandon_01_23_13.xfdf output /var/www/pdf/results/testNew.pdf flatten
The command would need to be able to accept a PHP variable so its customized for the user. Is there an easy way to do this?
Yes, you can use exec(), pcntl_exec(), system().
$command = 'pdftk /var/www/pdf/TimeCard.pdf fill_form /var/www/pdf/results/Brandon_01_23_13.xfdf output /var/www/pdf/results/testNew.pdf flatten';
exec($command);
Be very careful when using these commands, they are very useful/powerful, but because of this a hacker could potentially gain access to your whole server through it (depending on permissions, but it's more than enough to compromise your site).
If you need to send user uploaded file names/text, check them to the blood (for example check if the file path is in the proper place, and not ../../../something.pdf, check MIME types and extensions).
Yes, you can use:
system
exec
passthru
Depending on your exact requirements, you can use exec(), system() or shell_exec()
Use the system() or eval() functions.
But make sure the user can not inject arbitrary commands!
Related
I need to create a website that utilizes 2 existing encryption CMD.exe in PHP.
I know that you can use exec() to open CMD file in PHP, but currently my situation is I will need to type like this
D:\temp\userA>d:\myprogfolder\myprog /u r
in my command so that the program will works, in which the D:\temp\userA contains all the file that I need to encrypt and after > is the location of my exe file.
As you can see, they are both in different locations. So for exec(), I don't know how to write a command that can fit into exec() as I try to fill the above line into exec() and it doesn't run.
Is there a way so that I can combine the location of my file that I want to encrypt and exe location into one line and pass it to exec()?
Thank you.
Change the working directory before executing the command:
chdir("D:\temp\userA");
exec("myprogfolder\myprog /u r");
Is there any reason why I can not complied files in PHP's shell_exec/exec/system function?
Example of something that does work in command line and PHP's shell_exec function:
<?php
$data = shell_exec("ls");
echo $data;
?>
Example of something that does not work in PHP's shell_exec function but will work in command line (I can confirm that):
<?php
$data = shell_exec("./c-compiled-file argv1 argv2 argv3");
echo $data;
?>
Is there anything I can do on my server so this will work? I've looked everywhere and no solutions I found fixed the problem. The compiled file is in the same directory as the PHP script as well, it just won't execute it. Also if you're asking, yes I have tried this with SSH2 and it still will not execute.
Also PHP is not in safe mode and NO functions are disabled.
Some common glitches when executing external commands from PHP that work fine from shell:
Command uses relative paths but PHP is launched from an arbitrary location:
Use getcwd() / chdir() to get/set working directory
PHP and shell run with different user credentials. This is often the case when PHP runs through a web server.
PHP and shell run different commands. Many people call stuff like exec("foo $bar") and doesn't even check what "foo $bar" contains.
No error checking is done. The bare minimum is to capture and print standard output, standard error, status code and, of course, all PHP error messages including warnings and notices.
You can redirect stderr to sdtout
You can use a PHP function that allows to capture more information, such as exec()
The web server is disallowed to execute the command at operating system level.
Lookout for SELinux or similar tools.
Just a guess, but the binary you're trying to execute might not have the proper permissions. Prepeding it with ./ in the command line forces it to execute, but PHP probably strips that for security purposes. Try this:
chmod +x c-compiled-file
You want to use system in the second case, and not shell_exec.
system executes an external program and displays the output.
shell_exec executes a command via shell and returns the complete output as a string.
and for good measure:
exec simply executes an external program.
Furthermore you want to make sure your external program is executable and (though you have stated it, I'll restate this) has execute permissions for the user which is running the web server. You also want to make sure the directory your external program is running in has the ability to write to its directory or /tmp or whatever output directory you have set.
Finally you should always use absolute paths for executing things like this in cron or php or whatever... so don't use ./c-compiled-file argv1 argv2 argv3, but instead use /home/username/c-compiled-file argv1 argv2 argv3 or whatever the full path is.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
php shell_exec() vs exec()
How do I run a linux command from a PHP script? I'm running Linux Debian and PHP5. I want to be able to issue a wget command to the console.
An example of what I'm looking for is something like this:
phpFunction ("wget http://www.example.com/image.jpg /folder");
echo "done";
Also would I be able to echo the output of that function?
Use exec to run any command. Be careful not to exec any user input though, as it can severely compromise your server.
Also, note that most shared servers block off the exec function so you won't be able to use it.
Finally, as a shorthand, you can wrap the command you want to exec in backticks.
You can do what you want with the following code :
system(command);
See http://php.net/system
You can execute linux commands within a php script - all you have to do is put the command line in brackits (`).
And also concentrate on exec() , this and shell_exec() ..
you can use
exec
shell_exec
http://php.net/manual/en/function.shell-exec.php
I want to send ffmpeg output to a php file so I can use a regex and update the output into a database. This will allow me to handle progress for multiple uploads. Does anyone know how to do this? Can it be done? Currently I can execute a php file with parameters after the ffmpeg command, and get ffmpeg to write to a txt file but can I send the output to the php file and execute it?
execute php file with parameters
&& php /opt/lampp/htdocs/xampp/site/update_db.php ".$parameter1." ".$parameter2.";
Write output to txt file
ffmpeg command and filepath to converted 1> /home/g/Desktop/output.txt 2>&1
Can something like this be done?
ffmpeg command and filepath to converted 1> php /opt/lampp/htdocs/xampp/site/update_db.php ".$output." 2>&1
Yes, you can read STDIN.
http://php.net/manual/en/features.commandline.io-streams.php
If it were me, I'd just execute FFMPEG from within PHP. You have a bit more flexibility that way, but I know that isn't desirable for every application.
You could use exec to call ffmpeg, then use the content of the output parameter to get returned output.
But doing so only allow you to get the output once the program execution is terminated:
If a program is started with this
function, in order for it to continue
running in the background, the output
of the program must be redirected to a
file or another output stream. Failing
to do so will cause PHP to hang until
the execution of the program ends.
Occasionally my media server goes down and I'm wondering if it's possible to start it remotely using php to check the port and if it's not running invoke cron (or some other way) to run a shell command. Is this possible because this is not a strong area for me. Here's the process I use with PuTTy.
login to shell
cd to source/red5/dist
screen
./red5.sh
CTRL-A then D to detach
logout
Simplest thing is to write a shell script. And then login to remote console via PHP.
shell_exec: execute a shell command and returns the output as string.
exec: just executes an external program
A simple way to achieve what you want is to run this in screen:
while /bin/true ; do ./red5.sh ; done
If you can write a shell script that does what you need, then PHP's has exec(), system() and passthru() for you.
PHP actually has a special operator for executing shell commands, the backtick:
`cd source/red5/dist`
will go to the specified directory. (But I don't know much about shell, so I can't implement you the whole thing.)
If you need much control over the execution (I don't know whether you need here) use proc_open.
you can use corn job on php and put all command on .sh file and run like this
59 11 * * 1,2,3,4,5 root command file.sh?token
something like this ,it will be save
There is more than one good answer here, but you should opt for executing the init script for red5 instead of the .sh or .bat. There are pre-made init scripts here: http://code.google.com/p/bigbluebutton/downloads/detail?name=red5&can=2&q= and here: http://www.videowhisper.com/forum.php?ftid=48&t=init-file-red5-linux-installations-red5-linux-init.d-chkconfig