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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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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // 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.

    const ssh = try chilkat.Ssh.init();
    defer ssh.deinit();

    const ssh_port = 22;
    ssh.connect("ssh.example.com", ssh_port) catch {
        std.debug.print("{s}\n", .{try ssh.getLastErrorText(alloc)});
        return;
    };

    // 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.
    const password = "mySshPassword";

    ssh.authenticatePw("mySshLogin", password) catch {
        std.debug.print("{s}\n", .{try ssh.getLastErrorText(alloc)});
        return;
    };

    // Open a session channel.  A negative return value indicates failure.
    const channel_num = ssh.openSessionChannel();
    if (channel_num < 0) {
        std.debug.print("{s}\n", .{try ssh.getLastErrorText(alloc)});
        return;
    }

    // Request X11 forwarding.  Named variables make each argument's meaning clear.
    const single_connection = false;
    const auth_prot = "MIT-MAGIC-COOKIE-1";
    const auth_cookie = "d92f5e1a7c8b4306af17c2e5b9d43081";
    const screen_num = 0;
    ssh.sendReqX11Forwarding(channel_num, single_connection, auth_prot, auth_cookie, screen_num) catch {
        std.debug.print("{s}\n", .{try ssh.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("X11 forwarding requested.\n", .{});

    ssh.disconnect();
}