Perl

SSH Tunnel with Dynamic Port Forwarding

See more SSH Examples

Demonstrates how to start a background thread that runs a portable SSH tunnel w/ dynamic port forwarding that the foreground thread can use for establishing connections through an SSH tunnel. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

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

my $success = 0;

my $tunnel = Chilkat2::SshTunnel->new;

my $sshHostname = 'sftp.example.com';
my $sshPort = 22;

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

# Indicate that the background SSH tunnel thread will behave as a SOCKS proxy server
# with dynamic port forwarding:
$tunnel->DynamicPortForwarding(1);

# 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->InboundSocksUsername('chilkat123');
$tunnel->InboundSocksPassword('password123');

# Start the listen/accept thread to begin accepting SOCKS proxy client connections.
# Listen on port 1080.
$success = $tunnel->BeginAccepting(1080);
if (!$success) {
    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, 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.

# For this example, let's do a simple HTTPS request:
my $url = 'https://www.ethereum.org/';

my $http = Chilkat2::Http->new;

# Indicate that the HTTP object is to use our portable SOCKS proxy/SSH tunnel running in our background thread.
$http->SocksHostname('localhost');
$http->SocksPort(1080);
$http->SocksVersion(5);
$http->SocksUsername('chilkat123');
$http->SocksPassword('password123');

$http->SendCookies(1);
$http->SaveCookies(1);
$http->CookieDir('memory');

# Do the HTTPS page fetch (through the SSH tunnel)
my $html = $http->QuickGetStr($url);
if (!$http->LastMethodSuccess) {
    print $http->LastErrorText, "\n";
    exit;
}

# Stop the background listen/accept thread:
my $waitForThreadExit = 1;
$success = $tunnel->StopAccepting($waitForThreadExit);
if (!$success) {
    print $tunnel->LastErrorText, "\n";
    exit;
}

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