# Slither, the Solidity source analyzer
[](https://travis-ci.com/trailofbits/slither)
[](https://empireslacking.herokuapp.com)
Slither is a Solidity static analysis framework written in Python 3. It runs a suite of vulnerability detectors, prints visual information about contract details, and provides an API to easily write custom analyses. Slither enables developers to find vulnerabilities, enhance their code comphrehension, and quickly prototype custom analyses.
## Features
* Detects vulnerable Solidity code with low false positives
* Identifies where the error condition occurs in the source code
* Easy integration into continuous integration pipelines
* Built-in 'printers' quickly report crucial contract information
* Detector API to write custom analyses in Python
* Ability to analyze contracts written with Solidity >= 0.4
* Intermediate representation ([SlithIR](https://github.com/trailofbits/slither/wiki/SlithIR)) enables simple, high-precision analyses
## Usage
```
$ slither tests/uninitialized.sol
[..]
INFO:Detectors:Uninitialized state variables in tests/uninitialized.sol, Contract: Uninitialized, Vars: destination, Used in ['transfer']
[..]
```
If Slither is run on a directory, it will run on every `.sol` file of the directory. All vulnerability checks are run by default.
### Configuration
* `--solc SOLC` : Path to `solc` (default 'solc')
* `--solc-args SOLC_ARGS` : Add custom solc arguments. `SOLC_ARGS` can contain multiple arguments
* `--disable-solc-warnings` : Do not print solc warnings
* `--solc-ast` : Use the solc AST file as input (`solc file.sol --ast-json > file.ast.json`)
* `--json FILE` : Export results as JSON
* `--exclude-name` : Excludes the detector `name` from analysis
### Printers
* `--printer-summary` : Print a summary of the contracts
* `--printer-quick-summary` : Print a quick summary of the contracts
* `--printer-inheritance` : Print the inheritance relations
* `--printer-inheritance-graph` : Print the inheritance graph in a file
* `--printer-vars-and-auth` : Print the variables written and the check on `msg.sender` of each function
## Checks available
By default, all the checks are run. Use --detect-_name-of-check_ to run one check at a time.
Num | Check | What it Detects | Impact | Confidence
--- | --- | --- | --- | ---
1 | `suicidal` | Suicidal functions | High | High
2 | `uninitialized-state` | Uninitialized state variables | High | High
3 | `uninitialized-storage` | Uninitialized storage variables | High | High
4 | `arbitrary-send` | Functions that send ether to an arbitrary destination | High | Medium
5 | `reentrancy` | Reentrancy vulnerabilities | High | Medium
6 | `locked-ether` | Payable functions that do not send ether | Medium | High
7 | `tx-origin` | Dangerous usage of `tx.origin` | Medium | Medium
8 | `assembly` | Assembly usage | Informational | High
9 | `low-level-calls` | Low level calls | Informational | High
10 | `naming-convention` | Conformance to Solidity naming conventions | Informational | High
11 | `pragma` | If different pragma directives are used | Informational | High
12 | `solc-version` | If an old version of Solidity used (< 0.4.23 ) | Informational | High
13 | `unused-state` | Unused state variables | Informational | High
[Contact us ](https://www.trailofbits.com/contact/ ) to get access to additional detectors.
## How to install
Slither requires Python 3.6+ and [solc ](https://github.com/ethereum/solidity/ ), the Solidity compiler.
### Using Pip
```
$ pip install slither-analyzer
```
### Using Git
```bash
$ git clone https://github.com/trailofbits/slither.git & & cd slither
$ python setup.py install
```
## Getting Help
Feel free to stop by our [Slack channel ](https://empireslacking.herokuapp.com ) (#ethereum) for help using or extending Slither.
* The [Printer documentation ](https://github.com/trailofbits/slither/wiki/Printer-documentation ) describes the information Slither is capable of visualizing for each contract.
* The [Detector documentation ](https://github.com/trailofbits/slither/wiki/Adding-a-new-detector ) describes how to write a new vulnerability analyses.
* The [API documentation ](https://github.com/trailofbits/slither/wiki/API-examples ) describes the methods and objects available for custom analyses.
* The [SlithIR documentation ](https://github.com/trailofbits/slither/wiki/SlithIR ) describes the SlithIR intermediate representation.
## License
Slither is licensed and distributed under the AGPLv3 license. [Contact us ](mailto:opensource@trailofbits.com ) if you're looking for an exception to the terms.
