(Mobilization) Bonjour Android, it's Zeroconf!

Slides of the talk given at Mobilization PL 2016 in Lodz

Transcript

1. IT’S ZEROCONF Bonjour Android Roberto Orgiu
2. WHAT IS ZEROCONF?
3. “ZERO-CONFIGURATION NETWORKING IS A SET OF TECHNOLOGIES THAT AUTOMATICALLY CREATES A USABLE COMPUTER NETWORK BASED ON THE INTERNET PROTOCOL SUITE (TCP/IP) WHEN COMPUTERS OR NETWORK PERIPHERALS ARE INTERCONNECTED.“ WHAT IS ZEROCONF
4. WHAT IS ZEROCONF “IT DOES NOT REQUIRE MANUAL OPERATOR INTERVENTION OR SPECIAL CONFIGURATION SERVERS.“
5. WHERE CAN WE FIND ZEROCONF?
6. ALMOST EVERYWHERE
7. BONJOUR ANDROID, IT’S ZEROCONF THINK “DIFFERENT” ▸ ZeroConf is a standard ▸ UPnP/DLNA are somehow similar, but different people and ideas ▸ Apple has its own implementation, called Bonjour (once Rendezvous) ▸ On Android, we have very different solutions for using it
8. APPLE OFTEN REFERS TO ZEROCONF AS BONJOUR, GIVING THEIR OWN DEFINITION OF THE CONCEPTS BONJOUR ANDROID, IT’S ZEROCONF FUN FACT
9. Wut? Why do you even…?
10. BONJOUR ANDROID, IT’S ZEROCONF HOW DOES IT WORK? Ehy! I am 192.168.1.50 and I have the service AndroidService running on port 56472! Great! Exactly what I was looking for!
11. BONJOUR ANDROID, IT’S ZEROCONF ▸ No infrastructure needed ▸ Simplicity over scalability ▸ 4 areas: IP interface configuration, translation between host name and IP address, IP multicast address allocation, service discovery ▸ Aware of network changes ▸ Still a draft HOW DOES IT WORK?
12. BONJOUR ANDROID, IT’S ZEROCONF ▸ Configure netmask ▸ Allocate unique IP address IP INTERFACE CONFIGURATION
13. BONJOUR ANDROID, IT’S ZEROCONF ▸ Allows hostnames to be mapped to IP addresses and back ▸ Failure proof with retry mechanism ▸ Conflict detection TRANSLATION BETWEEN HOST NAME AND IP ADDRESS
14. BONJOUR ANDROID, IT’S ZEROCONF IP MULTICAST ADDRESS ALLOCATION ▸ List which of the scopes (local, site-local, link-local) are available ▸ Select a multicast address preventing conflicts
15. BONJOUR ANDROID, IT’S ZEROCONF SERVICE DISCOVERY ▸ Service must be discoverable via identifier and/or type ▸ Discovery without the use of a service-specific protocol and should complete in a timely manner (10s of seconds) ▸ Prompt detection of new services in a timely manner (10s of seconds) D R A F T
16. BONJOUR ANDROID, IT’S ZEROCONF HOW DOES IT WORK? ▸ Each part must start with _ (underscore) ▸ The second part only allows _tcp or _udp _ServiceType._TransportProtocolName. List of common services goo.gl/EXh1g
17. BONJOUR ANDROID, IT’S ZEROCONF WHAT ABOUT ANDROID? ▸ API FROM 4.1 ▸ JMDNS FOR JAVA ▸ APPLE NATIVE (C++) IMPLEMENTATION
18. BONJOUR ANDROID, IT’S ZEROCONF JMDNS FOR JAVA ▸ Easy to implement ▸ Runs on the main thread, unless we specify otherwise ▸ Distributed as JAR or via Maven repo ▸ Long start-up time ▸ Compatible with all the Android versions
19. BONJOUR ANDROID, IT’S ZEROCONF WHAT ABOUT ANDROID? ▸ API FROM 4.1 ▸ JMDNS FOR JAVA ▸ APPLE NATIVE (C++) IMPLEMENTATION
20. BONJOUR ANDROID, IT’S ZEROCONF APPLE NATIVE (C++) IMPLEMENTATION ▸ Ported to Android by Apple ▸ Open-sourced ▸ Needs Android NDK ▸ Few projects come with it already packed in ▸ Short startup time ▸ More complex logic
21. BONJOUR ANDROID, IT’S ZEROCONF WHAT ABOUT ANDROID? ▸ API FROM 4.1 ▸ JMDNS FOR JAVA ▸ APPLE NATIVE (C++) IMPLEMENTATION
22. BONJOUR ANDROID, IT’S ZEROCONF ANDROID API ▸ From Android 4.1, custom attributes added with 5.1 (API 21) ▸ Already asynchronous, with return on the main thread ▸ Verbose, but easy to implement ▸ Based on two steps: discovery and resolution ▸ Only one service can be resolved at a time http://developer.android.com/training/connect-devices-wirelessly/nsd.html
23. BONJOUR ANDROID, IT’S ZEROCONF ANDROID API - SERVER NsdServiceInfo serviceInfo = new NsdServiceInfo(); serviceInfo.setServiceName("DroidConService"); serviceInfo.setServiceType("_http._tcp."); serviceInfo.setPort(randomPort); nsdManager = Context.getSystemService(Context.NSD_SERVICE); nsdManager.registerService(serviceInfo, NsdManager.PROTOCOL_DNS_SD, mRegistrationListener); Remember to unregister the service upon app closing!
24. BONJOUR ANDROID, IT’S ZEROCONF ANDROID API - CLIENT class Resolver extends NsdManager.ResolveListener { @Override public void onResolveFailed(NsdServiceInfo serviceInfo, int errorCode) {} @Override public void onServiceResolved(NsdServiceInfo serviceInfo) { // here we can use our resolved service } }; Resolve resolveListener = new Resolve();
25. BONJOUR ANDROID, IT’S ZEROCONF ANDROID API - CLIENT class Resolver extends NsdManager.ResolveListener { @Override public void onResolveFailed(NsdServiceInfo serviceInfo, int errorCode) {} @Override public void onServiceResolved(NsdServiceInfo serviceInfo) { // here we can use our resolved service } }; Resolve resolveListener = new Resolve();
26. BONJOUR ANDROID, IT’S ZEROCONF ANDROID API - CLIENT class SimpleDiscoveryListener extends NsdManager.DiscoveryListener { @Override public void onDiscoveryStarted(String regType) {} @Override public void onServiceFound(NsdServiceInfo service) { if (service.getServiceName().contains(“DroidConService")){ nsdManager.resolveService(service, resolveListener); } } @Override public void onServiceLost(NsdServiceInfo service) {} @Override public void onDiscoveryStopped(String serviceType) {} @Override public void onStartDiscoveryFailed(String serviceType, int errorCode) { nsdManager.stopServiceDiscovery(this); } @Override public void onStopDiscoveryFailed(String serviceType, int errorCode) { nsdManager.stopServiceDiscovery(this); }};
27. BONJOUR ANDROID, IT’S ZEROCONF ANDROID API - CLIENT class SimpleDiscoveryListener extends NsdManager.DiscoveryListener { @Override public void onDiscoveryStarted(String regType) {} @Override public void onServiceFound(NsdServiceInfo service) { if (service.getServiceName().contains(“DroidConService")){ nsdManager.resolveService(service, resolveListener); } } @Override public void onServiceLost(NsdServiceInfo service) {} @Override public void onDiscoveryStopped(String serviceType) {} @Override public void onStartDiscoveryFailed(String serviceType, int errorCode) { nsdManager.stopServiceDiscovery(this); } @Override public void onStopDiscoveryFailed(String serviceType, int errorCode) { nsdManager.stopServiceDiscovery(this); }};
28. BONJOUR ANDROID, IT’S ZEROCONF ANDROID API - CLIENT SimpleDiscoveryListener discoveryListener = new SimpleDiscoveryListener(); nsdManager.discoverServices(SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD, discoveryListener); nsdManager.stopServiceDiscovery(discoveryListener);
29. BONJOUR ANDROID, IT’S ZEROCONF ANDROID API - CLIENT SimpleDiscoveryListener discoveryListener = new SimpleDiscoveryListener(); nsdManager.discoverServices(SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD, discoveryListener); nsdManager.stopServiceDiscovery(discoveryListener);
30. ARE THERE BETTER WAYS OF DOING IT?
31. YES, THERE ARE! ARE THERE BETTER WAYS OF DOING IT
32. BONJOUR ANDROID, IT’S ZEROCONF BETTER WAYS OF DOING IT ▸ better-zeroconf ▸ RxDNSSD ▸ RxBonjour ▸ ZeRxConf ▸ android-mdns ▸ JmDNS ▸ Apple mDNS ▸ Apple mDNS ▸ JmDNS + Android Native APIs ▸ Apple mDNS
33. Q & A
34. BONJOUR ANDROID, IT’S ZEROCONF THANKS FOR WATCHING!