PHP Extension Requires Chilkat v11.0.0+

SSH Tunnel Inside another SSH Tunnel

See more SSH Tunnel Examples

Demonstrates how to create a TCP/IP socket connection through an SSH tunnel that is dynamic port forwarded through another SSH tunnel. PHP Extension

<?php

include("chilkat.php");

$success = false;

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

$tunnel = new CkSshTunnel();

$sshHostname = 'www.ssh-serverA.com';
$sshPort = 22;

//  Connect to an SSH server and establish the SSH tunnel:
$success = $tunnel->Connect($sshHostname,$sshPort);
if ($success == false) {
    print $tunnel->lastErrorText() . "\n";
    exit;
}

//  Authenticate with the SSH server via a login/password
//  or with a public key.  
//  This example demonstrates SSH password authentication.
$success = $tunnel->AuthenticatePw('mySshLogin','mySshPassword');
if ($success == false) {
    print $tunnel->lastErrorText() . "\n";
    exit;
}

//  Indicate that the background SSH tunnel thread will behave as a SOCKS proxy server
//  with dynamic port forwarding:
$tunnel->put_DynamicPortForwarding(true);

//  We may optionally require that connecting clients authenticate with our SOCKS proxy server.
//  To do this, set an inbound username/password.  Any connecting clients would be required to 
//  use SOCKS5 with the correct username/password.
//  If no inbound username/password is set, then our SOCKS proxy server will accept both
//  SOCKS4 and SOCKS5 unauthenticated connections.

$tunnel->put_InboundSocksUsername('chilkat123');
$tunnel->put_InboundSocksPassword('password123');

//  Start the listen/accept thread to begin accepting SOCKS proxy client connections.
//  Listen on port 1080.
$success = $tunnel->BeginAccepting(1080);
if ($success == false) {
    print $tunnel->lastErrorText() . "\n";
    exit;
}

//  Now that a background thread is running a SOCKS proxy server that forwards connections
//  through an SSH tunnel, it is possible to use any Chilkat implemented protocol that is SOCKS capable,
//  such as HTTP, POP3, SMTP, IMAP, FTP, Socket, etc.  The protocol may use SSL/TLS because the SSL/TLS
//  will be passed through the SSH tunnel to the end-destination.  Also, any number of simultaneous
//  connections may be routed through the SSH tunnel.

$tunnelB = new CkSocket();

//  Indicate that the socket object is to use our portable SOCKS proxy/SSH tunnel running in our background thread.
$tunnelB->put_SocksHostname('localhost');
$tunnelB->put_SocksPort(1080);
$tunnelB->put_SocksVersion(5);
$tunnelB->put_SocksUsername('chilkat123');
$tunnelB->put_SocksPassword('password123');

//  Open a new SSH tunnel through the existing tunnel (via what we treat as a SOCKS5 proxy,
//  but it is actually a dynamic port-forwarded SSH tunnel).
$success = $tunnelB->SshOpenTunnel('www.ssh-serverB.com',22);
if ($success == false) {
    print $tunnelB->lastErrorText() . "\n";
    exit;
}

//  Authenticate with ssh-serverB.com
$success = $tunnelB->SshAuthenticatePw('uname','pwd');
if ($success == false) {
    print $tunnelB->lastErrorText() . "\n";
    exit;
}

//  OK, the SSH tunnel (within a tunnel) is setup.  Now open a channel within the tunnel.
//  Once the channel is obtained, the Socket API may
//  be used exactly the same as usual, except all communications
//  are sent through the channel in the SSH tunnel.
//  Any number of channels may be created from the same SSH tunnel.
//  Multiple channels may coexist at the same time.

//  Connect to an NIST time server and read the current date/time
$channel = new CkSocket();
$maxWaitMs = 4000;
$useTls = false;
$success = $tunnelB->SshNewChannel('time-c.nist.gov',37,$useTls,$maxWaitMs,$channel);
if ($success == false) {
    print $tunnelB->lastErrorText() . "\n";
    exit;
}

//  The time server will send a big-endian 32-bit integer representing
//  the number of seconds since since 00:00 (midnight) 1 January 1900 GMT.
//  The ReceiveInt32 method will receive a 4-byte integer, but returns
//  true or false to indicate success.  If successful, the integer
//  is obtained via the ReceivedInt property.
$bigEndian = true;
$success = $channel->ReceiveInt32($bigEndian);
if ($success == false) {
    print $channel->lastErrorText() . "\n";
    exit;
}

$dt = new CkDateTime();
$dt->SetFromNtpTime($channel->get_ReceivedInt());

//  Show the current local date/time
$bLocalTime = true;
print 'Current local date/time: ' . $dt->getAsRfc822($bLocalTime) . "\n";

//  Close the SSH channel.
$success = $channel->Close($maxWaitMs);
if ($success == false) {
    print $channel->lastErrorText() . "\n";
    exit;
}

//  Stop the background listen/accept thread:
$waitForThreadExit = true;
$success = $tunnel->StopAccepting($waitForThreadExit);
if ($success == false) {
    print $tunnel->lastErrorText() . "\n";
    exit;
}

//  Close the SSH tunnel (would also kick any remaining connected clients).
$success = $tunnel->CloseTunnel($waitForThreadExit);
if ($success == false) {
    print $tunnel->lastErrorText() . "\n";
    exit;
}


?>