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.

Download Chilkat 32-bit SSH / SFTP ActiveX (.msi)

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<?php

//  Important: It is helpful to send the contents of the
//  ssh.LastErrorText property when requesting support.

$ssh = new COM("Chilkat.Ssh");

//  Any string automatically begins a fully-functional 30-day trial.
$success = $ssh->UnlockComponent('Anything for 30-day trial');
if ($success != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

//  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->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();
?>