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androidandroid-ndkvpnaidl

How to find the status of VPN connection through framework APIs or any other efficient method?

So far:

I found the following solutions

  1. Using Broadcastreceiver

    The broadcast receiver is deprecated from ICS

  2. Using Ping or Traceroute

    It's definitely going to take lots of time and its not efficient

  3. Polling for DNS server changes

    It's definitely going to take lots of time and its not efficient

  4. Using ip-address

    Even though it won't take much time depending on the network connection it may vary

My conclusion:

So far all the solutions I found are either not efficient or not so reliable.

My questions:

If VPN is connected in android device then android OS must be aware of it.

Are there any public android framework APIs to read it because finding it locally is most efficient and reliable solution ?

Are there any other efficient and reliable ways to achieve it (like integrating a C or C plus plus library with NDK)?

Note:

I couldn't find any custom broadcast senders/AIDL from OpenVPN for Android as well

Solution

  • You can try to check for tun0 INTERFACE, It is being start afther the establish command. 

    try {
    for( NetworkInterface intf : Collections.list(NetworkInterface.getNetworkInterfaces())) {

        // Pass over dormant interfaces
        if(!intf.isUp() || intf.getInterfaceAddresses().size() == 0)
            continue;

            if ("tun0".equals(intf.getName())){
                // The VPN is up
                break;
            }
    }
}

    this also might work:

    (Collections.list(NetworkInterface.getByName("tun0")