When the server is listening on multiple interfaces or interfaces with multiple IPs, the outgoing datagrams are sometime delivered with the wrong source IP address. In order to fix that, each quic connection needs to extract the destination IP (and optionally interface id) of the received datagrams, and set it as source IP (and interface) on the sent datagrams. On most platforms, this can be done using ancillary data with recvmsg() and sendmsg(). Some of the machinery for this is already there for ECN, this change extends it to read the destination IP info and write it to the outgoing packets. Fix #1736
A QUIC implementation in pure Go
quic-go is an implementation of the QUIC protocol in Go. It implements the IETF QUIC draft-29, draft-32 and draft-34.
Version compatibility
Since quic-go is under active development, there's no guarantee that two builds of different commits are interoperable. The QUIC version used in the master branch is just a placeholder, and should not be considered stable.
When using quic-go as a library, please always use a tagged release. Only these releases use the official draft version numbers.
Guides
We currently support Go 1.15+, with Go modules support enabled.
Running tests:
go test ./...
QUIC without HTTP/3
Take a look at this echo example.
Usage
As a server
See the example server. Starting a QUIC server is very similar to the standard lib http in go:
http.Handle("/", http.FileServer(http.Dir(wwwDir)))
http3.ListenAndServeQUIC("localhost:4242", "/path/to/cert/chain.pem", "/path/to/privkey.pem", nil)
As a client
See the example client. Use a http3.RoundTripper as a Transport in a http.Client.
http.Client{
Transport: &http3.RoundTripper{},
}
Contributing
We are always happy to welcome new contributors! We have a number of self-contained issues that are suitable for first-time contributors, they are tagged with help wanted. If you have any questions, please feel free to reach out by opening an issue or leaving a comment.