AFWall fork/extension

[adonnini]

Hi, I would like to implement a gatekeeper function to control (not prevent) application access to the Internet, meter it, and monetize it for the device's owner/user.

AFWall, more than other firewall type applications, seems to be the "best" candidate for me to potentially use use as a starting point.

I downloaded the source code, imported it into Android Studio (Bumblebee) and built the app. The only change I had to make in order for the buld to complete successfully was to add the
android.useAndroidX=true
rule to gradle.properties

My initial goal is to understand how AFWall lets a user control an application's access to the Internet.

If I understand the code correctly, the PackageInfoData class contains all the information regarding applications installed on a device.

api.java seems to be the module where all the more important actions take place. It is not clear to me where in the source code the method to allow/disallow an application's access to the Internet is located. Would that happen through iptables rules which would be defined through CustomRule and CustomRuleOld?

Is setDefaultPermission, called in PackageBroadcast also used to control applications' access to the Internet?

Any guidance in navigating the source code to understand how AFWall lets users control applications' access to the Internet would be greatly appreciated.

Thanks,

Ale Donnini