ja-netfilter/README.md
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Signed-off-by: pengzhile <pengzhile@gmail.com>
2022-06-01 11:09:17 +08:00

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# ja-netfilter 2022.2.0
### A Java Instrumentation Framework
## Usage
* download from the [releases page](https://gitee.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!**
* or execute `java -jar /path/to/ja-netfilter.jar` to use `attach mode`.
* for **Java 17** you have to add at least these `JVM Options`:
```
--add-opens=java.base/jdk.internal.org.objectweb.asm=ALL-UNNAMED
--add-opens=java.base/jdk.internal.org.objectweb.asm.tree=ALL-UNNAMED
```
* edit your plugin config files: `${lower plugin name}.conf` file in the `config` dir where `ja-netfilter.jar` is located.
* the `config`, `logs` and `plugins` directories can be specified through **the javaagent args**.
* eg: `-javaagent:/path/to/ja-netfilter.jar=appName`, your config, logs and plugins directories will be `config-appname`, `logs-appname` and `plugins-appname`.
* if no javaagent args, they default to `config`, `logs` and `plugins`.
* this mechanism will avoid extraneous and bloated `config`, `logs` and `plugins`.
* 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` (log level) and start to enable it
* or add system property `-Djanf.debug=1` (log level) to enable it
* log level: `NONE=0`, `DEBUG=1`, `INFO=2`, `WARN=3`, `ERROR=4`
## Debug output
* the `ja-netfilter` will output debugging information to the `console` by default
* add environment variable `JANF_OUTPUT=value` and start to change output medium
* or add system property `-Djanf.output=value` to change output medium
* output medium value: [`NONE=0`, `CONSOLE=1`, `FILE=2`, `CONSOLE+FILE=3`, `WITH_PID=4`]
* eg: `console` + `file` + `pid file name` = 1 + 2 + 4 = 7, so the `-Djanf.output=7`
## Plugin system
* for developer:
* view the [scaffold project](https://gitee.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
* if the file suffix is `.disabled.jar`, the plugin will be disabled