(PHP Extension) SSH Tunnel (Port Forwarding via direct-tcpip channel)

Demonstrates how to create an SSH tunnel to a remote hostname:port via a direct-tcpip channel.

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<?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.

$ssh = new CkSsh();

// Connect to an SSH server:

// Hostname may be an IP address or hostname:
$hostname = '192.168.1.117';
$port = 22;

$success = $ssh->Connect($hostname,$port);
if ($success != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Wait a max of 5 seconds when reading responses..
$ssh->put_IdleTimeoutMs(5000);

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

// Open a direct-tcpip channel.  We want the SSH server to connect
// to www.chilkatsoft.com, port 80 (i.e. the web server).
// Data sent through the SSH tunnel is forwarded to the remote
// host:port.  (Note: The remote host:port does not need to be 
// a web server.  It can be anything.  It can be your own
// customer application server that listens on a port, or any
// other type of server.)
// When we read from the SSH channel, we'll be reading data
// sent from the remote host:port (i.e. the web server in this
// example).

$channelNum = $ssh->OpenDirectTcpIpChannel('www.chilkatsoft.com',80);
if ($channelNum < 0) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Build a simple HTTP GET request for http://www.chilkatsoft.com/xyz.html
$httpReq = 'GET /xyz123.html HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n';

// Send the HTTP request:
$success = $ssh->ChannelSendString($channelNum,$httpReq,'ansi');
if ($success != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Get the HTTP response.
// First read the HTTP response header which ends with a double CRLF.
// Calling ChannelReceiveUntilMatch will receive until match string is seen,
// or until a timeout occurs (IdleTimeoutMs property).  ChannelReceiveUntilMatch
// may read beyond the match string, but it will stop reading as soon as the match
// string is seen.
$caseSensitive = false;
$matchStr = '\r\n\r\n';
$success = $ssh->ChannelReceiveUntilMatch($channelNum,$matchStr,'ansi',$caseSensitive);
if ($success != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Extract the HTTP header from the receive buffer.
// (GetReceiveTextS extracts up to and including the match string from the receive buffer)

$responseHeader = $ssh->getReceivedTextS($channelNum,$matchStr,'ansi');
print '---- HTTP Response Header ----' . "\n";
print $responseHeader . "\n";

// Now get the body of the HTTP response (this is the HTML content
// of http://www.chilkatsoft.com/xyz.html
// It's possible we've already received the entire HTTP response in the
// call to ChannelReceiveUntilMatch.  Therefore, we'll poll for any remaining data
// and wait a max of .2 seconds.

$pollTimeoutMs = 200;
$numBytesRead = $ssh->ChannelPoll($channelNum,$pollTimeoutMs);
// We're not checking for an error here.
// A return value of -2 means that no data was available and the poll simply timed out (not an error)
// A return value of -1 indicates an error.
// A return value greater than 0 indicates that additional data was received.

print '---- HTML BODY ----' . "\n";

// Extract the remainder of the accumulated data in the internal receive buffer.
// This should be our HTML body:

$htmlBody = $ssh->getReceivedText($channelNum,'ansi');
print $htmlBody . "\n";

// Close the channel:
$success = $ssh->ChannelSendClose($channelNum);
if ($success != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Disconnect
$ssh->Disconnect();

?>