PHP

TCP or TLS over Multiple Hop SSH to Remote Server

See more Socket/SSL/TLS Examples

Demonstrates how to use the Chilkat Socket API to connect to a remote server (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => DestinationServer

The ConnectThroughSsh and UseSsh methods are added in Chilkat version 9.5.0.55 to accomplish this task.

Chilkat2 PHP

<?php

use Chilkat2\Socket;
use Chilkat2\Ssh;

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

$ssh1 = new Ssh();

// Connect directly to the 1st SSH server.
try {
    $ssh1->Connect('serverssh1.com', 22);

    // Authenticate using login/password:
    $ssh1->AuthenticatePw('ssh1Login', 'ssh1Password');

    // 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 Ssh();
    $ssh2->ConnectThroughSsh($ssh1, 'serverssh2.com', 22);

    // Authenticate with ssh2...
    $ssh2->AuthenticatePw('ssh2Login', 'ssh2Password');

    $socket = new Socket();

    // Tell the socket object to connect to our destination server though the ssh2 tunnel (which itself is routed through ssh1).
    // The connection looks like this:  ApplicationSocket(TLS) => ServerSSH1 => ServerSSH2 => DestinationServer
    $socket->UseSsh($ssh2);

    // Connect using TLS to www.chilkatsoft.com
    // We could also tunnel a bare TCP connection by specifying port 80 with useTls = false.
    $useTls = true;
    $maxWaitMillisec = 20000;
    $socket->Connect('www.chilkatsoft.com', 443, $useTls, $maxWaitMillisec);

    // Once the multiple hop SSH tunneled connection is setup,  the socket programming
    // is identical to the normal case where we have a direct connection.

    // Tell the socket object that all text is to be sent in the utf-8 encoding,
    // and the text received is assumed to be utf-8.
    $socket->StringCharset = 'utf-8';

    // Send an HTTP HEAD request:
    $socket->SendString("HEAD / HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n");

    // Wait a maximum of 4 seconds while no data is forthcoming:
    $socket->MaxReadIdleMs = 4000;

    // Get the 1st response line, which should be "HTTP/1.1 200 OK"
    $responseStatusLine = $socket->ReceiveToCRLF();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'StatusLine: ', $responseStatusLine, "\n";

// Now get the 1st line of the response header:
try {
    $responseHeaderLine = $socket->ReceiveToCRLF();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'HeaderLine: ', $responseHeaderLine, "\n";

// Now read the remainder of the response header by reading until a double CRLF is seen:
try {
    $remainderOfHeader = $socket->ReceiveUntilMatch("\r\n\r\n");
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'Remainder: ', $remainderOfHeader, "\n";

// Close the connection with the server.  This closes the tunnel through ssh2.
// Wait a max of 20 seconds (20000 millsec)
$socket->Close(20000);

// 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();