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libwebsockets/minimal-examples/secure-streams/minimal-secure-streams
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Andy Green 42dc817d8f ss: proxy: get rx flow control working 
This fixes the proxy rx flow by adding an lws_dsh helper to hide the
off-by-one in the "kind" array (kind 0 is reserved for tracking the
unallocated dsh blocks).

For testing, it adds a --blob option on minimal-secure-streams[-client]
which uses a streamtype "bulkproxflow" from here

https://warmcat.com/policy/minimal-proxy-v4.2-v2.json

		"bulkproxflow": {
			"endpoint": "warmcat.com",
			"port": 443,
			"protocol": "h1",
			"http_method": "GET",
			"http_url": "blob.bin",
			"proxy_buflen": 32768,
			"proxy_buflen_rxflow_on_above": 24576,
			"proxy_buflen_rxflow_off_below": 8192,
			"tls": true,
			"retry": "default",
			"tls_trust_store": "le_via_dst"
		}

This downloads a 51MB blob of random data with the SHA256sum

ed5720c16830810e5829dfb9b66c96b2e24efc4f93aa5e38c7ff4150d31cfbbf

The minimal-secure-streams --blob example client delays the download by
50ms every 10KiB it sees to force rx flow usage at the proxy.

It downloads the whole thing and checks the SHA256 is as expected.

Logs about rxflow status are available at LLL_INFO log level.
2021-04-07 15:54:26 +01:00
..
CMakeLists.txt ss: proxy: get rx flow control working 2021-04-07 15:54:26 +01:00
minimal-secure-streams.c ss: proxy: get rx flow control working 2021-04-07 15:54:26 +01:00
README.md ss: proxy: get rx flow control working 2021-04-07 15:54:26 +01:00

README.md

lws minimal secure streams

The application goes to https://warmcat.com and reads index.html there.

It does it using Secure Streams... the main code in minimal-secure-streams.c just sets up the context and opens a secure stream of type "mintest".

The handler for state changes and payloads for "mintest" is in ss-myss.c

The information about how a "mintest" stream should connect and the protocol it uses is kept separated in policy-database.c

build

 $ cmake . && make

usage

Commandline option Meaning
-d Debug verbosity in decimal, eg, -d15
-f Force connecting to the wrong endpoint to check backoff retry flow
-p Run as proxy server for clients to connect to over unix domain socket
--force-portal Force the SS Captive Portal Detection to feel it's behind a portal
--force-no-internet Force the SS Captive Portal Detection to feel it can't reach the internet
--blob Download a 50MiB blob from warmact.com, using flow control at the proxy 
[2019/08/12 07:16:11:0045] USR: LWS minimal secure streams [-d<verbosity>] [-f]
[2019/08/12 07:16:12:6102] USR: myss_state: LWSSSCS_CREATING, ord 0x0
[2019/08/12 07:16:12:6107] USR: myss_state: LWSSSCS_POLL, ord 0x0
[2019/08/12 07:16:12:6117] N: lws_ss_client_connect: connecting h1get warmcat.com /
[2019/08/12 07:16:12:6118] USR: myss_state: LWSSSCS_CONNECTING, ord 0x0
[2019/08/12 07:16:13:4171] USR: myss_state: LWSSSCS_CONNECTED, ord 0x0
[2019/08/12 07:16:13:4222] USR: myss_rx: len 1024, flags: 1
[2019/08/12 07:16:13:4243] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4244] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4244] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4245] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4246] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4247] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4252] USR: myss_rx: len 1015, flags: 0
[2019/08/12 07:16:13:4264] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4265] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4266] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4267] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4268] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4268] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4269] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4270] USR: myss_rx: len 1015, flags: 0
[2019/08/12 07:16:13:4278] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4279] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4280] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4281] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4282] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4283] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4283] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4284] USR: myss_rx: len 1015, flags: 0
[2019/08/12 07:16:13:4287] USR: myss_rx: len 1024, flags: 0
[2019/08/12 07:16:13:4288] USR: myss_rx: len 947, flags: 0
[2019/08/12 07:16:13:4293] USR: myss_rx: len 0, flags: 2
[2019/08/12 07:16:13:4399] USR: myss_state: LWSSSCS_DISCONNECTED, ord 0x0
[2019/08/12 07:16:13:4761] USR: myss_state: LWSSSCS_DESTROYING, ord 0x0
[2019/08/12 07:16:13:4781] USR: Completed: OK