qvalve can predictably impair QUIC flows, by dropping, reordering or
duplicating individual packets and sequences of packets. It is a non-transparent
UDP proxy that should be interposed between a QUIC client and a QUIC server.
The behavior of qvalve is configured with rules specified in a simple
language. Examples:
# drop the first three client initial pkts
> i1..3 drop
# drop the first server vneg pkt
< v1 drop
# duplicate the second server vneg pkt three times (= four copies sent)
< v2 dup 3
# reorder the first server handshake pkt (default: by one pkt)
< h1 reor
# nop does nothing
< h2 nop
More examples are in the tests directory and in https://github.com/NTAP/quant/tree/14/qvalve-tests.
See https://github.com/NTAP/quant/blob/14/bin/dtest.sh for an example for how to use this to automatically test a QUIC stack with docker containers (via the docker-compose config in https://github.com/NTAP/quant/blob/14/docker-compose.yml).
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Portions of this code are adapted from https://gist.github.com/vxgmichel/b2cf8536363275e735c231caef35a5df by Vincent Michel.
Copyright (c) 2017, Vincent Michel
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