/echo

Primary LanguageC

Echo server and client using the QUIC protocol

This is a demo program used in a DevConf.US 2021 talk Understanding QUIC by examples.

Compiling

  1. Install Meson, GLib, GnuTLS 3.7.2, and the dependencies
$ dnf install cmake gcc glib2-devel gnutls-devel g++ meson ninja-build

  1. meson _build

  2. meson compile -C _build

Running

Server

$ _build/serv localhost 5556 credentials/server-key.pem credentials/server.pem

Client

$ _build/cli localhost 5556 credentials/ca.pem

Logging

To enable logging for the application itself, set the G_MESSAGES_DEBUG envvar to echo. To enable ngtcp2 logging facility, set the same variable to ngtcp2.

Capturing traffic

  1. Run either cli or serv with the SSLKEYLOGFILE envvar set:
$ SSLKEYLOGFILE=$PWD/keylog.txt _build/cli localhost 5556 credentials/ca.pem
  1. Use wireshark or tshark to capture the traffic:
$ tshark -o "tls.keylog_file: $PWD/keylog.txt" \
         -i lo -Px -O quic -Y "udp.port == 5556"

TODO

  • ECN marking
  • UDP GSO

License

The MIT License