Perl

Request SSH X11 Forwarding

Demonstrates the Chilkat Ssh.SendReqX11Forwarding method, which sends an X11-forwarding request on a session channel. The arguments are the channel number, whether forwarding is limited to a single connection, and the X11 authentication protocol, cookie, and screen number.

Background: X11 forwarding lets a graphical program running on the remote host display its window on your local machine, tunneled over SSH. This is a low-level method that only sends the protocol request — your application is still responsible for the local X server side of the arrangement. The authentication cookie guards the forwarded display, so it should be a freshly generated value rather than a fixed constant.

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Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# Demonstrates the Ssh.SendReqX11Forwarding method, which sends an SSH X11-forwarding request
# on a session channel.  The 1st argument is the channel number, the 2nd limits forwarding to a
# single connection, and the 3rd through 5th supply the X11 authentication protocol, cookie,
# and screen number.

my $ssh = Chilkat2::Ssh->new;

my $sshPort = 22;
my $success = $ssh->Connect('ssh.example.com', $sshPort);
if (!$success) {
    print $ssh->LastErrorText, "\n";
    exit;
}

# Normally you would not hard-code the password in source.  You should instead obtain it
# from an interactive prompt, environment variable, or a secrets vault.
my $password = 'mySshPassword';

$success = $ssh->AuthenticatePw('mySshLogin', $password);
if (!$success) {
    print $ssh->LastErrorText, "\n";
    exit;
}

# Open a session channel.  A negative return value indicates failure.
my $channelNum = $ssh->OpenSessionChannel();
if ($channelNum < 0) {
    print $ssh->LastErrorText, "\n";
    exit;
}

# Request X11 forwarding.  Named variables make each argument's meaning clear.
my $singleConnection = 0;
my $authProt = 'MIT-MAGIC-COOKIE-1';
my $authCookie = 'd92f5e1a7c8b4306af17c2e5b9d43081';
my $screenNum = 0;
$success = $ssh->SendReqX11Forwarding($channelNum, $singleConnection, $authProt, $authCookie, $screenNum);
if (!$success) {
    print $ssh->LastErrorText, "\n";
    exit;
}

print "X11 forwarding requested.\n";

$ssh->Disconnect();