Small library to create a SSH Tunnel

Example usage:

use Savvii\SshTunnel\SshTunnel;

$tunnel = new SshTunnel(
    sshUsername: 'myuser',
    sshHost: 'jumpserver.example.com',
    sshPort: 22,
    bindHost: 'remote-db-host.local.lan',
    bindPort: 3306    
);

$db = new PDO(
    sprintf(
        "mysql:host=%s;port=%d",
        $tunnel->localAddress,
        $tunnel->localPort
    )
);

When the PHP script ends or the SshTunnel object is destroyed the SSH tunnel is disconnected.

Warning

When you create the object but let it go out of scope, by default the SSH tunnel will be cleaned up. This will not work:

function connect(): void
{
    $tunnel = new SshTunnel(...);
}

connect();
// At this point the SSH tunnel is disconnected because $tunnel went out of scope.

This will work:

function connect(): void
{
    return new SshTunnel(...);
}

$tunnel = connect();
// At this point the SSH tunnel works.

If you are creating the SshTunnel object in the constructor of a class, make sure to store it in a class property, to make it not go out of scope when the constructor is finished.

Requirements

• Linux, MacOS or FreeBSD
• PHP 8.0 or greater
• PHP functions proc_open,proc_close,proc_terminate and proc_get_status enabled
• Binary ssh
• Binary lsof, used by default but can be skipped.
• Binary nc, used by default but can be skipped.