[Bitcoin-development] Fuzzer?

[Bitcoin-development] Fuzzer?

[Amir Taaki]

Hey,

I heard there is a fuzzer in the works? Where can I find more details of this? I'm going to write one for libbitcoin, but if one already exists then I'd rather build on and use that.

Something simple like:
- Set previous block hash, set current target
- Start hashing
- Connect and send to specified host (i.e localhost)

That way I can force re-organisations and stress the blockchain algorithm. Should be trivial for me to build, but worth asking anyway :)

Thanks

Re: [Bitcoin-development] Fuzzer?

[Gavin Andresen]

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https://github.com/gavinandresen/bitcoin-git/tree/fuzzer

It is a transaction fuzzer; adding block fuzzing is on the TODO.

Basic usage is:
1. Use the send* RPC commands to get one or more transaction IDs
2. Run a script that repeatedly calls relayfuzzed with a nonce/txid
... and see how the connected peer(s) react to all the fuzzy 'inv/tx'
protocol messages.

I built it to stress-test BIP 16, there are lots of useful features that
could be added.  Patches welcome!

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Gavin Andresen

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