(Perl) 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.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

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

$ssh = chilkat::CkSsh->new();

# 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() . "\r\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() . "\r\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() . "\r\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() . "\r\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() . "\r\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() . "\r\n";
    exit;
}

# Disconnect
$ssh->Disconnect();