girlfriend

Girl Friend <- G F <- Generate Foundry Fork Test from Attack Transaction

She is truly a great friend.

Prerequisites

# Install abi-guesser
git clone git@github.com:fuzzland/abi-guesser-cli.git
cd abi-guesser-cli
npm i -g

# Init submodules
git submodule update --recursive --init

Getting Started

Config

Before running the commands, you need to rename config/config.example.toml to config.toml. And modify it as follows:

• The RPC URLs should support the debug API (e.g. debug_traceTransaction).
• Add your scan keys. You can get them as follows (take ETH as an example, other chains are similar):
  1. Register an account on Etherscan.
  2. Create API keys.

Generate A Foundry Test PoC

gf is used to generate a Foundry test PoC using a given txhash.

Usage: gf [OPTIONS] --txhash <TXHASH>

Options:
  -c, --config <CONFIG>  the config file path [default: config/config.toml]
  -t, --txhash <TXHASH>  the txhash
  -h, --help             Print help
  -V, --version          Print version

• Example

# The output_dir is configured in the config file [default: ./test]
cargo run --bin gf -- -t 0xeaef2831d4d6bca04e4e9035613be637ae3b0034977673c1c2f10903926f29c0

# If the output_dir is `./test`, you can run it directly
forge test -vvvvv

Backtest

bt is used to perform a backtest with a given txhashes file.

Usage: bt [OPTIONS]

Options:
  -c, --config <CONFIG>                the config file path [default: config/config.toml]
  -t, --txhashes-path <TXHASHES_PATH>  the back test txhashes file path [default: assets/eth_tx.txt]
  -r, --result-dir <RESULT_DIR>        the result dir [default: eth_back_test]
  -h, --help                           Print help
  -V, --version                        Print version

• Example

# ETH backtest
cargo run --bin bt
# BSC backtest
cargo run --bin bt -- -t assets/bsc_tx.txt -r bsc_back_test

Progress

We collected 74 historical attacks on ETH and 117 on BSC for backtesting. The commands executed are as mentioned above. The results are as follows:

Chain	Total	Success	Success Rate
ETH	74	24	32.43%
BSC	117	46	39.32%

Optimization item

• The return value of a static call is now not handled efficiently. This may be used in the subsequent process.
• The parsing of calldata/returndata should use recursion to decode.
• Preparation for attack, gf now simply copy attacker txs in 3h. In fact, it can be handled more finely.
• For handling loops, a more efficient approach should be adopted.