Open a Forwarded Channel through an SSH Tunnel

See more Socket/SSL/TLS Examples

Demonstrates Socket.SshNewChannel, which opens a port-forwarded channel through an authenticated SSH tunnel to a destination host and port, populating a Socket with the connected channel.

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

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

    const socket = try chilkat.Socket.init();
    defer socket.deinit();

    // Connect to the SSH server and initialize an SSH tunneling session.  Port 22 is conventional but
    // not required.
    socket.sshOpenTunnel("ssh.example.com", 22) catch {
        std.debug.print("{s}\n", .{try socket.getLastErrorText(alloc)});
        return;
    };

    // Authenticate the SSH session before opening forwarded channels.
    // The SSH password should come from a secure source rather than being hard-coded.
    const ssh_password = "mySshPassword";
    socket.sshAuthenticatePw("sshUser", ssh_password) catch {
        std.debug.print("{s}\n", .{try socket.getLastErrorText(alloc)});
        return;
    };

    // Open a port-forwarded channel through the authenticated SSH tunnel to the destination host and
    // port, populating a Socket with the connected channel.  Set the 3rd argument to true to establish
    // TLS to the destination inside the tunnel.
    const b_tls = false;
    const max_wait_ms = 20000;
    const channel = try chilkat.Socket.init();
    defer channel.deinit();
    socket.sshNewChannel("db.internal", 5432, b_tls, max_wait_ms, channel) catch {
        std.debug.print("{s}\n", .{try socket.getLastErrorText(alloc)});
        return;
    };

    // Use the channel socket to send and receive with the destination through the tunnel.
    std.debug.print("Forwarded channel opened to the destination.\n", .{});
}