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Posted by Jamie Alessio on 10/02/38 11:10
> I'm attempting to execute some things on remote servers using ssh, using
> a strictly limited account created for this express purpose. I set up
> passwordless key authentication from the user the web server runs as to
> the limited account on the remote server. I wrote some PHP code which
> calls:
> system("ssh user@host mycommand", $result)
>
> If I become the web-server user and run this via php from the
> command-line, everything works. The commands are executed remotely, and
> the expected HTML comes to standard-out.
>
> If I run this through apache, I can verify that the authentication
> happens successfully, and the commands are run, but output to the
> browser hangs. No errors, nothing. I have attempted using shell_exec,
> and popen as well- both exhibit the same problems. I can run commands
> other than ssh without difficulty.
>
> This is happening on suse linux 9.1, PHP 4.3.4. Any clues as to what may
> be happening?
>
Ross,
A couple of ideas:
- Here's your code: "system("ssh user@host mycommand", $result)"
You do realize that $result only contains the return code of the system
call and not the actual output from the program called via system(), right?
- Do you have any sort of output buffering in the script?
- Have you tried using passthru() or backticks[1] instead of system()?
Same results?
- Is it possible the ssh command on the remote host is sending the
output to STDERR instead of STDOUT? I'm not sure that this makes sense
since you say it is working via PHP CLI, but perhaps you are seeing the
STDERR output along with the output of your script? This idea a longshot
at best.
--
Jamie
1. http://us4.php.net/language.operators.execution
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