ssh connection using php

Question

On my VPN I have a remote server and a remote router (which is running RouterOS with an API and supports ssh connections). What I want is to write a php script and deploy it on the server so it will connect to the remote router using ip address and login credentials and than, run some commands.

I read on the internet that there is a solution for that which is libssh2.php library, but I cannot figure out how to install/use or even test if it work on the server. The Server is running CentOS.

Thank you in advance!!!

user3756812 · Accepted Answer · 2014-06-19 14:06:19Z

1

I think you'd be best off with phpseclib, a pure PHP SSH implementation. It has a number of advantages over libssh2:

http://phpseclib.sourceforge.net/ssh/compare.html

Here's an example:

<?php
include('Net/SSH2.php');

$ssh = new Net_SSH2('www.domain.tld');
if (!$ssh->login('username', 'password')) {
    exit('Login Failed');
}

echo $ssh->exec('pwd');
echo $ssh->exec('ls -la');
?>

answered Jun 19, 2014 at 14:06

user3756812

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laurent · Accepted Answer · 2014-06-19 01:37:01Z

0

I did this before and was simply using the SSH command directly. For example:

$sshCmd = "ssh [email protected] \"ls -la ~\"";
exec($sshCmd, $output, $errorCode);
echo "Error code: $errorCode\n";
echo "Output: " . implode("\n", $output);

If you have more complex scripts to run, you can put then in a .sh script and run then via bash:

$sshCmd = "ssh [email protected] 'bash -s' < \"/path/to/script.sh\"";
exec($sshCmd, $output, $errorCode);
echo "Error code: $errorCode\n";
echo "Output: " . implode("\n", $output);

edited Jun 19, 2014 at 1:37

answered Jun 19, 2014 at 1:14

laurent

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8 Comments

KostR Over a year ago

Ehm, ok, but how do I see the output??? I wrote did as you suggested and the server didn't return me an error. But how do I know that the commands were executed??? Is there a way to output what ever the commands return???

laurent Over a year ago

@user2462749, exec can optionally return the command output and error code. I've updated my example to show this.

KostR Over a year ago

So I wrote exec($sshCmd, $shhOut, $shhErr) or die("Failed to connect"); ___ And it prints "Failed to connect". So my guess is that exec is not working. Any ideas what might be the problem???

laurent Over a year ago

No that wouldn't work, you need to send all the commands in one go via SSH. In your case, it would be something like this: ssh [email protected] "/system backup name=phpRemoteBackup". First, you could try this in your shell to double-check that it actually works. Also try without the die() statement. Instead, inspect the output and error code of ssh as in the example code in my answer.

KostR Over a year ago

I tried ssh [email protected] /system clock print on my shell and it didn't work. It asked me for the password. How do I put the password with the username???

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