BonAHA framework - IEEE CCNC 2009
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The document discusses Bonaha, a service discovery framework designed for mobile ad-hoc applications, addressing the challenges of infrastructure-less networks. It presents an intuitive API that simplifies service registration and network transition management compared to existing solutions like Apple's Bonjour. Additionally, it highlights various applications developed using Bonaha, including group chat, file sharing, and multi-player games.
![BonAHA framework Node 2 Node 1 key21 = value21 key22 = value22 key23 = value23 key24 = value24 key11 = value11 key12 = value12 key13 = value13 key14 = value14 [2] node1.get(key13) [1] node1.register() [3] data = node1.fileGet( value13);](https://image.slidesharecdn.com/09janccncbonaha-090326112459-phpapp02/85/BonAHA-framework-IEEE-CCNC-2009-11-320.jpg)
BonAHA framework - IEEE CCNC 2009
- 1. BonAHA : Service Discovery Framework for Mobile Ad-Hoc Applications Suman Srinivasan, Arezu Moghadam, Henning Schulzrinne Internet Real Time Lab, Columbia University, New York, USA IEEE CCNC 2009: M1-2 Personal Ad Hoc and Sensor Networks
- 2. Topics Problem/motivation Approach Service discovery and Bonjour BonAHA framework Demos Applications developed Related Work
- 3. Motivation Mobile nodes; highly mobile networks No infrastructure OLPC; mesh networks New class of applications “ Ad-hoc/Mobile-P2P applications” Opportunistic networks Applications need to Be aware of network transitions State/metadata of nodes in the network
- 4. Examples of applications Group chat File transfer File synchronization Local multiplayer games
- 5. Solution 1: Raw multicast Initial solution “ Dumb” multicasting to announce and get information from peers
- 6. Solution 2: Service Discovery Looked at writing our own framework for solving this problem But, good news: Service discovery does exactly this Actually, something very similar ZeroConf: Most widely implemented Apple’s Bonjour, Avahi, … Apple’s Bonjour Still requires a learning curve Developer has to rewrite code
- 7. Problems Bonjour API Three event listeners, five function calls Have to be completely implemented if an ad-hoc application wants to announce and listen Two other major problems No internal state maintained by Bonjour for services, related IP address and TXT records Resolution can be done only on arrival or exit of services/nodes
- 8. BonAHA Aim to create a framework that solves these problems Much simpler , and more intuitive, API for ad-hoc applications Applications need not maintain state or do “resolution” BonAHA will maintain state No need for resolution; all nodes and metadata are objects
- 9. BonAHA For registration service = new BService("7ds_location2", "tcp"); service.set("Latitude", lat); service.set("Longitude", lon); service.register(); service.setListener(this); For network transitions (nodes entering/leaving) nodeUpdated() nodeExited() No need for maintaining state
- 11. BonAHA framework Node 2 Node 1 key21 = value21 key22 = value22 key23 = value23 key24 = value24 key11 = value11 key12 = value12 key13 = value13 key14 = value14 [2] node1.get(key13) [1] node1.register() [3] data = node1.fileGet( value13);
- 12. TXTRecord DNSRegistration RegisterListener serviceRegistered() DNSSDService BrowseListener serviceFound() serviceLost() DNSSDService ResolveListener serviceResolved() DNSSD.resolve() DNSSD.register() TXTRecord Host IP DNSSD.browse() set() Bonjour State Diagram
- 13. BService BListener serviceUpdated() set() register() setListener() serviceExited() BNode get() getHostName() getHostAddress() BonAHA State Diagram
- 14. Example: LocationFinder Very simple, impractical application Only for providing a quick code sample Scenario Two nodes meet each other Lack global knowledge of location Each can find out other’s last location information and update their own location
- 17. TicTacToe BonAHA sample application Shows use in Multi-player games Mutual awareness
- 18. BonAHA Applications BBS application Runs on iPod/iPhone Allows users to upload “posts” Other users can pick up “posts” and share their own Information on events, etc that they are interested in sharing
- 19. BonAHA Applications BBS Application
- 20. BonAHA Applications Group chat Allows users to discover peers in local network and chat Rooms can be set up for private chats
- 21. BonAHA Applications File Sharing Users can share files with each other by dragging and dropping files onto peers’ computers Handles peers entering and leaving network
- 22. Related Work Proem (2001) Needs to run on “peerlet engine” No public documentation of API JXTA Excellent for P2P Heavyweight for our goals Peer2Me File transfer on Bluetooth
- 23. Related Work LightPeers Sep 2007 PhD dissertation (B. Christensen) Similar model to BonAHA “ Application”: Each application has its own GUID that identifies it “ Session”: A group of nodes registered as running the application Code Application app = new Application(appid); lpconn = new Connection(app); ses = lpconn.CreateSession(); List<Session> sessions = lpconn.GetSessionList();
- 24. Related Work - LightPeers Differences with BonAHA PING packet sent every second to search for peers In Bonjour, there is exponential backoff No library-daemon interface LP “server” listens to packets Reimplementation of entire architecture (service discovery + framework)
- 25. Future Work Develop useful applications Fix some API features Allow one BService object to create several instances. E.g.: one node may want to serve HTTP on two ports. Perhaps add high-level communications API for simple networking tasks. E.g.: getFile() , notifyPeer() , sendObject()
- 26. Conclusion New scenario: highly mobile networks without infrastructure Require a new class of application – “ad-hoc” or “mobile P2P” apps Require a new framework for programming these applications BonAHA , built on top of ZeroConf service discovery: a framework towards building such applications Questions?
- 27. Backup Slides
- 28. Apple’s Bonjour Implementation of Zero Configuration Networking (ZeroConf) by Apple Computer This is what enables sharing in iTunes, iChat, etc. Implemented on Mac OS, Windows, Linux and some other POSIX platforms Ported to Windows CE as well
- 29. Apple’s Bonjour Two main components mDNS Daemon Takes care of all Zeroconf events Listens to network events (link up, down, …) Listens to mDNS traffic and keeps track of all service announcements and requests Library (Interfaces for C, Java, …) Allows applications to announce, browse for and resolve services
- 30. Apple’s Bonjour Details: Presented in Fall 2006 http://developer.apple.com/networking/bonjour/ Important things to remember IP address autoconfiguration: Link-local addressing Pick random from 169.254/16 Hostname resolution: mDNS DNS-like protocol, each host listens on 224.0.0.251, port 5353
- 31. Apple’s Bonjour Service Discovery: DNS-SD DNS PTR records Announcement of form: ServiceName._http._tcp.local. Browsing for _http._tcp.local. gives list of web service instances Resolving ServiceName yields hostname, TXT records, etc.
- 32. Bonjour API Factory class: DNSSD Interfaces: Callback functions for events BrowseListener : Service browsing ResolveListener : Name Resolution RegisterListener: Service Registration QueryListener : DNS Record Resolution DomainListener : Domain Resolution
- 33. Bonjour API BrowseListener serviceFound() when services appear serviceLost() when service leaves ResolveListener : serviceResolved() to get hostname, TXT records RegisterListener: serviceRegistered() when registration succeeds (or fails)
- 34. Related Work - LightPeers http://www.daimi.au.dk/~bentor/LightPeers/
- 35. TXTRecord DNSRegistration RegisterListener serviceRegistered() DNSSDService BrowseListener serviceFound() serviceLost() DNSSDService ResolveListener serviceResolved() DNSSD.resolve() DNSSD.register() TXTRecord Host IP DNSSD.browse() set() Bonjour State Diagram
- 36. BService BListener serviceUpdated() set() register() setListener() serviceExited() BNode get() getHostName() getHostAddress() BonAHA State Diagram