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liquidlan/

http://www.liquidlan.net/. What is it?. File sharing system for LANs extends the functionality of Windows(/Samba) networks Runs on top of Windows networks Client-server based Windows client (eMule framework) Linux server/search engine (Seek42 fork) Rotting away on my hard drive The GUI….

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liquidlan/

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  1. http://www.liquidlan.net/

  2. What is it? • File sharing system for LANs • extends the functionality of Windows(/Samba) networks • Runs on top of Windows networks • Client-server based • Windows client (eMule framework) • Linux server/search engine (Seek42 fork) • Rotting away on my hard drive • The GUI…

  3. The client GUI

  4. Is this P2P? • Sorta… was Napster P2P? • My front-end requires centralized server. • Client-server approach better for LiquidLan • Instantaneous search results • No need for “Internet” scalability • Highly simplified implementation (more reliable too) • Less resilient to close-minded administrations  • However, underlying overlay network is P2P. • SMB/CIFS use client server approach • Network Neighborhood can be viewed as network of peers and ultrapeers (winners of master browser elections) • LiquidLan doesn’t care though.

  5. The system

  6. Quick background • Server Message Block (SMB) • Protocol used by Windows networks • Mainly file/printer sharing, IPC • MS extended it, renamed CIFS • Can run over NetBIOS or TCP/IP • Inefficient though (broadcasts to entire subnet) • Windows networks • SMB client and server, Network Neighborhood, etc. • free, open source implementation called Samba

  7. The server

  8. The server • Seek42 • GPL’d Windows network search engine • Scans LANs, indexes results, answers search queries (TCP/IP) • Uses modified smbclient (not for long though) • ~10,000 lines of code • Heavily extended • But new version just released, so I will need to merge my changes.

  9. The server (modifications) • search returns more than just exact substring matches • search creates pretty-printed stats • smbclient patch filters junk file types • tse can expire an entire class C • new ipfile syntax • optimized (struct res_t).host… now long int • dynamic data structures for run-time reconfig • added comments, documentation • configuration file (no more defs.h) • easy installation • Numerous bug-fixes

  10. The server (TODO) • Merge seek42-1.0 with mine • Add opt-in support • Implement an XML-based configuration • Remove need for modified smbclient • Remove legacy code • Finish the config request handler • …

  11. The client • No restrictive webpage interface, UNC resource paths… • A fully-functional, specialized, application client • eMule application framework (threw out core logic) • Written in Visual C++, uses MFC heavily • Heavily relies on the Windows API • So in other words, not very portable  • Multi-threaded search client and download manager • Integrated Web browser (special purpose) • Highly configurable (needs work though) • Faaassssst!

  12. The client • But perhaps the coolest feature of all… • DRUM ROLL PLEASE…

  13. DLCP • Dynamic LiquidLan Configuration Protocol • Not to be confused with DHCP ;) • Conceptually very similar though • Zero-conf solution… • Dynamically resolve server address • Dependent on database-driven program that runs on dlcp.liquidlan.net • LiquidLan server operators can create an account and manage their config • Therefore, users can install, open, and connect automagically! • That is my ultimate goal… complete transparency of the underlying system (end-users don’t wanna know!)

  14. DLCP continued...

  15. The client (TODO) • Implement the initial exchange of configuration between the client and server; this must run asynchronously (in a separate thread). • Isolate all the hard-coded policies and make them user options. • Add the “Search hard drive for media” feature which traverses the hard drive for media to share, respecting DRM when possible*** • Add an auto-update mechanism (maybe) • Add iTunes, Windows Media Player, and Winamp integration. • MBCS support (TCHAR instead of char) • Eventually add IPv6 support (maybe) • Finish DLCP! • …

  16. Current systems • PySMBSearch • UntzUntz LAN Scan • Strangesearch • Netropolis • Phynd • None of them come equipped with a usable application front end.

  17. Lit Review (quickly) • Incentives in BitTorrent Induce Free Riding • The Impact of DHT Routing Geometry on Resilience and Proximity • Tree-Based ALM using Proactive Route Maintenance • An XML-based Conversational Protocol for Web Services • Design Choices for Content Distribution in P2P Networks

  18. Design • Design Process Model similar to Waterfall • In general, good OOP design principles • Clean frameworks! • Loosely coupled (small interfaces) • Reusable/Extendable • The waterfall…

  19. The Waterfall

  20. THE END For more visit www.liquidlan.net

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