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Predictably impair QUIC flows
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README.md

qvalve

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).

Copyright

Copyright (c) 2018-2019, NetApp, Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Portions of this code are adapted from https://gist.github.com/vxgmichel/b2cf8536363275e735c231caef35a5df by Vincent Michel.

Copyright (c) 2017, Vincent Michel

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

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