http/2 parsing API

[mnot]

Hey,

I've only skimmed the docs, so I may have missed something; apologies if this is the case (and a ref appreciated).

I'd like to parse http/2 from a PCAP (file or live) to generate events, in order to feed them into things like mnot/htracr.

This is possible using the node HTTP parser for h1 (as in seen https://github.com/mranney/http_trace/blob/master/http_session.js), but AFAICT (again, after a brief look), not with http2.

[molnarg]

Hi Mark,

it's somewhat more complicated with node-http2 than http1 but it's doable.

We have a protocol "submodule" that exposes the lower level building blocks of node-http2. Two such building blocks you would need are the deserializer and the decompressor. Both of them are node Transform Streams and work like this: raw data -> deserializer -> packet objects -> decompressor -> packet objects with header packets assembled and decompressed. Do you think that would be enough for your needs? I can write a short example code for doing that.

Connection and stream state management would harder to reconstruct from a pcap file using the other building blocks from node-http2, but it would maybe be doable.

[guest271314]

@molnarg

I can write a short example code for doing that.

Can you kindly do that?

I'm reading your code trying to figure out how to implement an HTTP/2 server in the browser using WICG TCPServerSocket. Kind of stuck where to start.

[molnarg]

If you really only need parsing, look at https://github.com/molnarg/node-http2/blob/master/lib/protocol/framer.js#L69

If you want to run the whole library, probably best to replace the node TCP socket with a browser TCP socket around here: https://github.com/molnarg/node-http2/blob/master/lib/http.js#L468. You'd need to write a wrapper for the browser socket to expose an interface similar to a node socket.

[guest271314]

Thanks. I'm really trying to conceptualize the ALPN and TKS things, and what the headers look like. So far I have not not found an article like this Making a simple HTTP webserver in C that breaks every thing down step by step.

[guest271314]

file:///home/user/bin/wt/bun-http2-bundle.js:2960
    throw new Error("options.pfx or options.key and options.cert are required!");
          ^

Error: options.pfx or options.key and options.cert are required!
    at createServerTLS (file:///home/user/bin/wt/bun-http2-bundle.js:2960:11)

around here

function createServerTLS(options, requestListener) {
  if (typeof options === "function") {
    throw new Error("options are required!");
  }
  if (!options.pfx && !(options.key && options.cert)) {
    throw new Error("options.pfx or options.key and options.cert are required!");
  }
  options.plain = false;
  var server = new Server(options);
  if (requestListener) {
    server.on("request", requestListener);
  }
  return server;
}