Mod wstunnel » History » Revision 7
Revision 6 (gstrauss, 2017-10-23 00:15) → Revision 7/17 (gstrauss, 2020-07-15 01:27)
h1. mod_wstunnel
{{>toc}}
*Module: mod_wstunnel*
(since lighttpd 1.4.46)
WebSocket tunnel endpoint. This module terminates the websocket tunnel from a client. This module then passes data (without websocket frames) to a backend and encodes responses from backend in websocket frames before sending responses to client.
*EXPERIMENTAL* (new in lighttpd 1.4.46)
Note: if looking to proxy websockets to a backend, then see [[Docs_ModProxy]], [[Docs_ModCGI]], or other backends, some of which can be enabled to be transparent proxies to backends after client sends @Upgrade: websocket@
h2. Description
Brief description of [[Docs_ConfigurationOptions#mod_wstunnel|mod_wstunnel directives]]
table{margin-left: 2em}.
|_.option |_. description |
| wstunnel.server | backend server definition(s) for hosts to which to send requests; [[Docs_ConfigurationOptions#gw_backend-gateway-server-host-options|options]] for each backend host |
| wstunnel.balance | load-balancing algorithm for backends ("fair", "least-connection", "round-robin", "hash", or "sticky") |
| wstunnel.debug | debug level (value between 0 and 65535) |
| wstunnel.frame-type | websocket frame type: "text" or "binary" |
| wstunnel.map-extensions | map multiple extensions to the same backend |
| wstunnel.origins | list of permitted origins in Origin request header (optional) |
| wstunnel.ping-interval | send websocket PING frame at given interval in sec (default 0; none sent) |
Details for @wstunnel.server@ parameters can be found in [[Docs_ModFastCGI|mod_fastcgi]] documentation, since the wstunnel module shares the same code infrastructure with the FastCGI module, and fastcgi.server parameters are very similar.
h3. Example: websocket tunnel to VNC server via noVNC client
Follow instructions to download and install, or use available packages for your Linux/*BSD distribution.
https://github.com/novnc/noVNC
x11vnc
If noVNC files are installed in /usr/share/novnc, and x11vnc is running as VNC server with @x11vnc -localhost -forever -display :0@ then lighttpd mod_wstunnel can be configured with:
<pre>
server.document-root = "/usr/share/novnc"
server.indexfiles = ("index.html")
server.modules += ( "mod_wstunnel" )
$HTTP["url"] =~ "^/websockify" {
wstunnel.server = ( "" => ( ( "host" => "127.0.0.1", "port" => "5900" ) ) )
wstunnel.frame-type = "binary"
server.stream-request-body = 2
server.stream-response-body = 2
}
</pre>
Please take proper precautions to limit access to the VNC server, possibly including requiring proper authentication and limiting access to certain source IPs.