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libwebsockets/minimal-examples-lowlevel/ws-server/minimal-ws-raw-proxy
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Andy Green 41eed87c79 cmake: upgrade everyone to 3.5 minimum version
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CMakeLists.txt cmake: upgrade everyone to 3.5 minimum version 2023-12-08 13:23:04 +00:00
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README.md examples: move existing to m-e-lowlevel and start repoulating m-e with SS 2021-10-08 09:49:05 +01:00

README.md

lws minimal ws - raw proxy

This demonstrates how to use a proxy connection object to bind together two or more connections in a proxy. This particular example has a ws server that creates an onward "raw" client connection to 127.0.0.1:1234.

You can make a suitable "raw server" with

$ nc -l 127.0.0.1 1234

build

 $ cmake . && make

Commandline Options

Option Meaning
-d Set logging verbosity

usage

 $ ./lws-minimal-ws-raw-proxy
[2021/03/04 21:14:45:0540] U: LWS minimal ws-raw proxy | visit http://localhost:7681 (-s = use TLS / https)
[2021/03/04 21:14:45:0898] N: LWS: 4.1.99-v4.1.0-294-g2776b4ce65, loglevel 1031
[2021/03/04 21:14:45:0902] N: NET CLI SRV H1 H2 WS SS-JSON-POL SSPROX IPV6-on
[2021/03/04 21:14:45:1146] N:  ++ [3224086|wsi|0|pipe] (1)
[2021/03/04 21:14:45:1203] N:  ++ [3224086|vh|0|netlink] (1)
[2021/03/04 21:14:45:1284] N:  ++ [3224086|vh|1|localhost||7681] (2)
[2021/03/04 21:14:45:1401] N: lws_socket_bind: nowsi: source ads ::
[2021/03/04 21:14:45:1425] N:  ++ [3224086|wsi|1|listen|localhost||7681] (2)
[2021/03/04 21:14:46:1164] N:  ++ [3224086|wsisrv|0|adopted] (1)
[2021/03/04 21:14:46:2771] N:  ++ [3224086|wsisrv|1|adopted] (2)
[2021/03/04 21:14:46:3159] N:  ++ [3224086|wsicli|0|RAW/raw-skt/127.0.0.1] (1)
[2021/03/04 21:14:46:3451] N:  ++ [3224086|wsisrv|2|adopted] (3)

Visit http://localhost:7681 in a browser... it loads JS that opens a ws connection to the proxy's ws server side. That causes the proxy to open a raw client connection to 127.0.0.1:1234, and forward anything you type in the browser to the raw server, and anything typed in the raw server (you must press enter on netcat to get it sent) is proxied back to the browser.

The proxy can handle many ws connections each with their individual onward raw client connections, so you could open multiple browser windows. But you will need a better "raw server" than netcat, which is restricted to just the one peer at a time.