jNetPcap for Android Packet capture

Question

I have been trying to capture the packets in my android app when connected to Wifi.

I am using a broadcast receiver class.

I have successfully received the broadcast when connected to a wifi network, using this code:

ConnectivityManager cm = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        if (null != activeNetwork) {
            if(activeNetwork.getType() == ConnectivityManager.TYPE_WIFI){
                //wificonnected
                return 1;
            }
}

I want to capture the packets when network connected. I know everything about wifiInfo and WifiManager class.

I am trying here with jNetPcap library. How to capture those packets? I have no ideas.

Please help me guys...

score 2 · Answer 1 · edited May 23 '17 at 11:52

You'll need to use VpnService to redirect all of your device's network traffic through your app.

If you want to use jNetPcap, here's a working example (more info here and here).

After reading your traffic, you'll have to open one socket to each destination port/ip as stated here. It won't be easy, though. You'll have to understand VpnService first, I suggest you take a look at ToyVpn as a start.

Hope this info helps.

jNetPcap for Android Packet capture

1 Answers1