Neqo, an Implementation of QUIC written in Rust

To run test http 0.9 programs (neqo-client and neqo-server):

• cargo build
• ./target/debug/neqo-server 12345 -k key --db ./test-fixture/db
• ./target/debug/neqo-client http://127.0.0.1:12345/ -o --db ./test-fixture/db

To run test HTTP/3 programs (neqo-client and neqo-http3-server):

• cargo build
• ./target/debug/neqo-http3-server [::]:12345 --db ./test-fixture/db
• ./target/debug/neqo-client http://127.0.0.1:12345/ --db ./test-fixture/db

Faster Builds with Separate NSS/NSPR

You can clone NSS (https://hg.mozilla.org/projects/nss) and NSPR
(https://hg.mozilla.org/projects/nspr) into the same directory and export an
environment variable called NSS_DIR pointing to NSS. This causes the build to
use the existing NSS checkout. However, in order to run anything that depends
on NSS, you need to set $\[DY]LD\_LIBRARY\_PATH to point to
$NSS_DIR/../dist/Debug/lib.

Debugging Neqo

Using SSLKEYLOGFILE to decrypt Wireshark logs

Info here

TODO: What is the minimum Wireshark version needed?
TODO: Above link may be incorrect, protocol now called TLS instead of SSL?

Using RUST_LOG effectively

As documented in the env_logger documentation,
the RUST_LOG environment variable can be used to selectively enable log messages
from Rust code. This works for Neqo's cmdline tools, as well as for when Neqo is
incorporated into Gecko, although Gecko needs to be built in debug mode.

Some examples:

1. RUST_LOG=neqo_transport::dump ./mach run lists sent and received QUIC
   packets and their frames' contents only.
2. RUST_LOG=neqo_transport=debug,neqo_http3=trace,info ./mach run sets a
   'debug' log level for transport, 'trace' level for http3, and 'info' log
   level for all other Rust crates, both Neqo and others used by Gecko.
3. RUST_LOG=neqo=trace,error ./mach run sets trace level for all modules
   starting with "neqo", and sets error as minimum log level for other
   unrelated Rust log messages.

Trying In-development Neqo code in Gecko

In a checked-out copy of Gecko source, set paths for the four Neqo crates to
local versions in netwerk/socket/neqo_glue/Cargo.toml. For example, if Neqo
was checked out to /home/alice/git/neqo, change:

neqo-http3 = { tag = "v0.1.7", git = "https://github.com/mozilla/neqo" }
neqo-transport = { tag = "v0.1.7", git = "https://github.com/mozilla/neqo" }
neqo-common = { tag = "v0.1.7", git = "https://github.com/mozilla/neqo" }

to

neqo-http3 = { path = "/home/alice/git/neqo/neqo-http3" }
neqo-transport = { path = "/home/alice/git/neqo/neqo-transport" }
neqo-common = { path = "/home/alice/git/neqo/neqo-common" }

and

[dependencies.neqo-crypto]
tag = "v0.1.7"
git = "https://github.com/mozilla/neqo"
default-features = false
features = ["gecko"]

to

[dependencies.neqo-crypto]
path = "/home/alice/git/neqo/neqo-crypto"
default-features = false
features = ["gecko"]

Note: Using newer Neqo code with Gecko may also require changes (likely to neqo_glue) if
something has changed.

Compile Gecko as usual with ./mach build.