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Introduction

c4udit is a static analyzer for solidity contracts based on regular expressions specifically crafted for Code4Rena contests.

It is capable of finding low risk issues and gas optimization documented in the c4-common-issues repository.

Note that c4udit uses c4-common-issues's issue identifiers.

Installation

First you need to have the Go toolchain installed. You can find instruction here.

Then install c4udit with:

$ go install github.com/byterocket/c4udit@latest

To just build the binary:

$ git clone https://github.com/byterocket/c4udit
$ cd c4udit/
$ go build .

Now you should be able to run c4udit with:

$ ./c4udit

Usage

Usage:
	c4udit [flags] [files...]

Flags:
	-h    Print help text.
	-s    Save report as file.

Example

Running c4udit against the examples directory:

$ ./c4udit examples/
Files analyzed:
- examples/Test.sol

Issues found:
 G001:
  examples/Test.sol::4 => uint256 a = 0;
  examples/Test.sol::12 => for (uint256 i = 0; i < array.length; i++) {

 G002:
  examples/Test.sol::12 => for (uint256 i = 0; i < array.length; i++) {

 G007:
  examples/Test.sol::6 => string b = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";

 G008:
  examples/Test.sol::13 => i = i / 2;

 L001:
  examples/Test.sol::16 => token.transferFrom(msg.sender, address(this), 100);

 L003:
  examples/Test.sol::1 => pragma solidity ^0.8.0;

Using the -s flag, c4udit will create a report in markdown format. For an example check out the report in the examples directory here.

License

Note that this tool is licensed as free software!