Using socket to get IP instead of getifaddrs

[advancenXX]

I am using fastdds v2.7.0 on Android 12.
create_participant is invoked whenever my target network interface enabled, and I check it through some java framework api like,
Enumeration nifs = NetworkInterface.getNetworkInterfaces();
while (nifs.hasMoreElements()) {
NetworkInterface nif = nifs.nextElement();

        Enumeration<InetAddress> addresses = nif.getInetAddresses();
        while (addresses.hasMoreElements()) {
            InetAddress addr = addresses.nextElement();
    
            if (addr instanceof Inet4Address) {
                String host = addr.getHostAddress();
                // host equals("1.2.3.4")
            }
        }
    }

I use NetworkInterface to ensure my participant can find the target ip before it started, but I still find it has no ip sometimes according to tcpdump.
I searched from internet and found two ways to get ip,

• getifaddrs, getnameinfo. which may miss if ip is assigned but no any actual socket IO;
• socket. Android use this one, from InterfaceController::getCfg;

I am wondering if it can be used to get ip by socket instead of getifaddrs, as I have tested it on my own environment, especially for Android 12.

[advancenXX]

hi @EduPonz , could you please review this PR, currently it is a draft patch to fix my problem only, but I can complete it if you think it is useful for Android 12.
Thanks