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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use chilkat();

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

$ssh = new chilkat::CkSsh();

#  Any string automatically begins a fully-functional 30-day trial.
$success = $ssh->UnlockComponent("Anything for 30-day trial");
if ($success != 1) {
    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 != 1) {
    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 != 1) {
    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 != 1) {
    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 = 0;
$matchStr = "\r\n\r\n";
$success = $ssh->ChannelReceiveUntilMatch($channelNum,$matchStr,"ansi",$caseSensitive);
if ($success != 1) {
    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 ----" . "\r\n";
print $responseHeader . "\r\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 ----" . "\r\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 . "\r\n";

#  Close the channel:
$success = $ssh->ChannelSendClose($channelNum);
if ($success != 1) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

#  Disconnect
$ssh->Disconnect();