Curtis Curtis - 3 months ago 20
PHP Question

SSH not working correctly via PHP exec

Hey I'm attempting to utilise the PHP SSH2 functions of which I've used a class from over a GitHub: Here but doesn't seem to be working as expected.

I'm trying to

cd
into a directory and then list files, but seems to ignore the
cd
and when I use the
ls
command it just displays the root dir.

Here's when I perform a normal
ls
on my root directory:

drwx------ 6 root root 4096 Aug 12 18:23 .
drwxr-xr-x 22 root root 4096 Aug 11 08:28 ..
-rw------- 1 root root 2963 Aug 12 18:33 .bash_history
-rw-r--r-- 1 root root 3106 Oct 22 2015 .bashrc
drwx------ 3 root root 4096 Aug 11 21:05 .cache
drwxr-xr-x 3 root root 4096 Aug 12 18:21 .local
drwxr-xr-x 2 root root 4096 Aug 12 18:22 .nano
drwxr-xr-x 18 root root 4096 Aug 11 21:07 myOtherDirectory
-rw-r--r-- 1 root root 148 Aug 17 2015 .profile
-rw------- 1 root root 1024 Aug 12 18:27 .rnd
-rw-r--r-- 1 root root 252 Aug 12 18:28 .wget-hsts


And here's then I try to access the
myOtherDirectory
using SSH via PHP

$ssh = new ssh("ip", "root", "pass");
$ssh("cd myOtherDirectory");
$result = $ssh("ls -la");
print_r($result);

Answer

The SSH protocol permits you to make one SSH connection (called a session) to a remote host and then run multiple channels through the single connection. A single channel can represent an interactive session, a single SFTP transfer, and so on. Each channel is independent of the others.

$ssh = new ssh("ip", "root", "pass");
$ssh("cd myOtherDirectory");
$result = $ssh("ls -la");

What you're doing here is creating a single SSH session to the remote host, then creating two channels. The first channel runs cd and then exits. The second channel runs ls and then exits.

You want to run both commands in a single session. Assuming the remote system is using bash or a similar shell to run commands, this ought to work:

$ssh = new ssh("ip", "root", "pass");
$result = $ssh("cd myOtherDirectory && ls -la");

Alternately, you could specify the correct remote directory in the ls command:

$ssh = new ssh("ip", "root", "pass");
$result = $ssh("ls -la myOtherDirectory");
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