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.

import { Socket } from '@chilkat/react-native'

async function chilkatExample() {
  const socket = new Socket();

  // Connect to the SSH server and initialize an SSH tunneling session.  Port 22 is conventional but
  // not required.
  try {
    await socket.sshOpenTunnelAsync('ssh.example.com', 22);
  } catch {
    console.log(socket.lastErrorText);
    return;
  }

  // Authenticate the SSH session before opening forwarded channels.
  // The SSH password should come from a secure source rather than being hard-coded.
  const sshPassword = 'mySshPassword';
  try {
    await socket.sshAuthenticatePwAsync('sshUser', sshPassword);
  } catch {
    console.log(socket.lastErrorText);
    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 bTls = false;
  const maxWaitMs = 20000;
  const channel = new Socket();
  try {
    await socket.sshNewChannelAsync('db.internal', 5432, bTls, maxWaitMs, channel);
  } catch {
    console.log(socket.lastErrorText);
    return;
  }

  // Use the channel socket to send and receive with the destination through the tunnel.
  console.log('Forwarded channel opened to the destination.');
}