For anyone wondering, this is indeed possible! You just need to add some
global request handlers and channel factories to the client as follows -
List<RequestHandler<ConnectionService>> globalRequestHandlers = new
ArrayList<>(ClientBuilder.DEFAULT_GLOBAL_REQUEST_HANDLERS);
globalRequestHandlers.add(TcpipForwardHandler.INSTANCE);
globalRequestHandlers.add(CancelTcpipForwardHandler.INSTANCE);
client.setGlobalRequestHandlers(globalRequestHandlers);
List<ChannelFactory> channelFactories = new
ArrayList<>(ClientBuilder.DEFAULT_CHANNEL_FACTORIES);
channelFactories.add(DirectTcpipFactory.INSTANCE);
client.setChannelFactories(channelFactories);
// note you probably want to configure this!
client.setForwardingFilter(AcceptAllForwardingFilter.INSTANCE);
Then on the server you can create forwards like this -
public Proxy startProxy(Session session) throws IOException {
ConnectionService connectionService =
session.getService(ConnectionService.class);
Forwarder forwarder = connectionService.getForwarder();
SshdSocketAddress address = forwarder.startDynamicPortForwarding(new
SshdSocketAddress(hostName, port));
return new Proxy(Type.SOCKS, address.toInetSocketAddress());
}
On Wed, Apr 7, 2021 at 1:17 PM Jared Wiltshire <ja...@infiniteautomation.com>
wrote:
> Is there any way to initiate a port forward from the server? It seems like
> it could be implemented by adding TcpipForwardHandler to the client?
>
> In particular I would like to open a SOCKS proxy port on the server.
> OpenSSH supports this, although it is still initiated from the client.
>
> Thanks,
>
> Jared Wiltshire
>
