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Signed-off-by: pengzhile <pengzhile@gmail.com>
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# ja-netfilter
### A javaagent lib for network filter
### A javaagent lib for network filter
## Usage
* 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 own rule list config file. The `ja-netfilter` will look for it in the following order(find one and stop
searching):
* passed as args of `-javaagent`.
eg: `-javaagent:/absolute/path/to/ja-netfilter.jar=/home/neo/downloads/janf_config.txt`
* file path in environment variable: `JANF_CONFIG`
* file path in `java` startup property: `janf.config`
. `eg: java -Djanf.config="/home/neo/downloads/janf_config.txt"`
* some apps support the `JVM Options file`, you can add as a line of the `JVM Options file`
. `eg: -Djanf.config="/home/neo/downloads/janf_config.txt"`
* file path in the same dir as the `ja-netfilter.jar`
* file path in your home directory, named: `.janf_config.txt`. `eg: /home/neo/.janf_config.txt`
* file path in the subdirectory named `.config` in your home directory. `eg: /home/neo/.config/janf_config.txt`
* file path in the subdirectory named `.local/etc` in your home
directory. `eg: /home/neo/.local/ect/janf_config.txt`
* file path in the directory named `/usr/local/etc`. `eg: /usr/local/etc/janf_config.txt`
* file path in the directory named `/etc`. eg: `/etc/janf_config.txt`
* run your java application and enjoy~
## Config file format
```
[URL]
EQUAL,https://someurl
[DNS]
EQUAL,somedomain
# EQUAL Use `equals` to compare
# KEYWORD Use `contains` to compare
# PREFIX Use `startsWith` to compare
# SUFFIX Use `endsWith` to compare
# 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