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ja-netfilter/README.md

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# ja-netfilter v2.0.0
### A javaagent framework
## Usage
* download from the [releases page](https://github.com/ja-netfilter/ja-netfilter/releases)
* add `-javaagent:/absolute/path/to/ja-netfilter.jar` argument (**Change to your actual path**)
* add as an argument of the `java` command. eg: `java -javaagent:/absolute/path/to/ja-netfilter.jar -jar executable_jar_file.jar`
* some apps support the `JVM Options file`, you can add as a line of the `JVM Options file`.
* **WARNING: DO NOT put some unnecessary whitespace characters!**
* edit your plugin config files: `${lower plugin name}.conf` file in the `conf` dir where `ja-netfilter.jar` is located.
* run your java application and enjoy~
## Config file format
```
[ABC]
# for the specified section name
# for example
[URL]
EQUAL,https://someurl
[DNS]
EQUAL,somedomain
# EQUAL Use `equals` to compare
# EQUAL_IC Use `equals` to compare, ignore case
# KEYWORD Use `contains` to compare
# KEYWORD_IC Use `contains` to compare, ignore case
# PREFIX Use `startsWith` to compare
# PREFIX_IC Use `startsWith` to compare, ignore case
# SUFFIX Use `endsWith` to compare
# SUFFIX_IC Use `endsWith` to compare, ignore case
# REGEXP Use regular expressions to match
```
## Debug info
* the `ja-netfilter` will **NOT** output debugging information by default
* add environment variable `JANF_DEBUG=1` and start to enable it
* or add system property `-Djanf.debug=1` to enable it
## Plugin system
* for developer:
* view the [scaffold project](https://github.com/ja-netfilter/ja-netfilter-sample-plugin) written for the plugin system
* compile your plugin and publish it
* just use your imagination~
* for user:
* download the jar file of the plugin
* put it in the subdirectory called `plugins` where the ja-netfilter.jar file is located
* enjoy the new capabilities brought by the plugin