(PHP Extension) Multi-Hop SSH (SSH Through SSH)

Demonstrates how to SSH through one SSH server to get to another SSH server. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task. Technically, it should be possible to chain any number of servers using the ConnectThroughSsh multiple times:

Application => ServerSSH1 => ServerSSH2 ==> ServerSSH3 => ... => ServerSSHN

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$ssh1 = new CkSsh();

// Hostname may be an IP address or domain name:
$hostname = '192.168.1.108';
$port = 22;

// Connect directly to the 1st SSH server:
$success = $ssh1->Connect($hostname,$port);
if ($success != true) {
    print $ssh1->lastErrorText() . "\n";
    exit;
}

// Wait a max of 15 seconds when reading responses..
$ssh1->put_IdleTimeoutMs(15000);

// Authenticate using login/password:
$success = $ssh1->AuthenticatePw('myLogin','myPassword');
if ($success != true) {
    print $ssh1->lastErrorText() . "\n";
    exit;
}

// Connect through the 1st SSH connection to reach a 2nd SSH server.
// Note: Any number of SSH connections may be simultaneously tunneled through a single
// existing SSH connection.
$ssh2 = new CkSsh();
$success = $ssh2->ConnectThroughSsh($ssh1,'someremoteserver.com',22);
if ($success != true) {
    print $ssh2->lastErrorText() . "\n";
    exit;
}

$ssh2->put_IdleTimeoutMs(15000);

// Authenticate with ssh2...
$success = $ssh2->AuthenticatePw('myLogin2','myPassword2');
if ($success != true) {
    print $ssh2->lastErrorText() . "\n";
    exit;
}

// The application may now is connected and authenticated with ssh2.
// The application can do whatever it desires just as if it was directly
// connected to ssh2.   For example, the application might open
// a session channel to send commands or start a remote shell..
$channelNum = $ssh2->OpenSessionChannel();
if ($channelNum < 0) {
    print $ssh2->lastErrorText() . "\n";
    exit;
}

// ...
// ...
// ...

// Close the connection with ssh2.  (This closes the the tunnel through ssh1.)
// The connection with ssh1 is still alive, and may be used for more connections.
$ssh2->Disconnect();

// ...
// ...
// ...

$ssh1->Disconnect();

?>