Version History

You are currently running version 1.0.0.6 release of bunzilla

Version 1.0.0.7 released 5/20/9

enhancements
- Added "clear" button to search result window to allow the user to clear results they have already reviewed
- Modified system to perform 15 day partial file cleanup during maintenace cycle rather then just at startup so those who leave the program running 24 x 7 have files cleaned up. Made this a user controllable option via the storage configuration page
Bugs
- Modified 15 day partial file cleanup to remove the file reference if no segments exist rather then just removing the segment.
- Modified code to properly reset default values when the corresponding key is not found in the registry

Version 1.0.0.6 released 4/20/9

enhancements
- modified search screen so pressing the enter key will start the search so user does not have to click on the search button
Bugs
- Some programs such as eraser which cleans directory entries and cluster tips on the file system during a free space wipe caused some shared files to stop being shared. The program has been modified to allow continued sharing of a file if it detects another program has a prolonged lock on the file. A periodic rescan of indexed files has been added to assist in reindexing files that were modified by another program, but will now be left on the sharable list.

Version 1.0.0.5 released 3/20/9

enhancements
- Added autodownload feature to search results. This allows you to automatically download all matching results, which is useful as a 'scout' feature where you initiate a search for a hard to find files. You can leave the program running in the background and whenever a match is found, it will initiate a download automatically.
- Updated status screen to show performance graphs
- Added status information to task bar
- Added General configuration tab
other changes
- Updated help files and screen shots

Version 1.0.0.4 released 2/20/9

enhancements
- Modified clicking on notify in task bar to automatically restore normal size if screen was minimized
Tuned performance metrics
- Enhanced startup to remove partial downloads that are more then 15 days old
- Further tuned timing of how long known remote document references are retained. Known remote docs represent files recently seen. The source may have gone off-line since it was last seen. Shorter time means less likely the source has become unavailable.
- Refined critera for how long to keep known peers that have been unreachable. Eliminating infrequent users decreases time spent trying to connect to users who are no longer available.
- Modified upper limit to 500 on known peer database to keep fewer known peers since there aren't a large number of persistent users
- Enhanced connection management to wait a short while (2min) and then re-attempt connection to a failed peer. This should improve reconnect time to peers that are on poor quality networks and have lots of lost packets.
Bugs
- Fixed drawing of partially available files, set to white rather then background which was leaving whatever was on the screen show in the free space

Version 1.0.0.3 released 1/20/2009

enhancements
- Modified download progress bars, added mouse-over showing of percent downloaded
- Modified result tabs to display count on tab
- improved drawing of border on progress bar
bug fixes
- fixed bug: monitor screen not updated after flushing expired known remote docs. No user or performance issue, just incorrect display on screen
- removed tooltip on progress bar

Version 1.0.0.2 released 12/27/2008

bug fixes
- fixed bug: remote connection close/fail while closing connection could result in double reporting of closing leading to less then 0 connnections open. No functional problem, but status screen reports some huge number of open connections
- Fixed bug: delete from known remote documents when path returns rejected was failing to delete during download. Deletes occcur when the existing path is no longer valid because someone along the path joined or left the network or the hosting node removed the file. This could result in a prolonged hang in download that is unnecessary if other paths or sources could be located. Note, this only would effect someone who was along a single node path (eg. none of the nodes upstream from the failed node have more then 1 connection and thus can not initiate a new path search) otherwise a timeout would occur upstream and a new path search initiated.
Tuned performance metrics

adjusted computation of busy level, scaled up level of activity required
modified task manager to clean up tasks left abandon by remote nodes disconnecting more frequently
modified connection manager to slowdown attempting connection once all known peers have been tried
modify cache metrics to retain known remote documents for shorter periods of time to reduce period where a file might be no longer be available but is reported as such by a caching node

Initial Release: version 1.0.0.1 released 12/17/2008

Searching

Filter results by file type
Filter results by file size
Display results with fragment and number of source indicators
Search local cache
Search cache of known remote documents

Manage remote cache lifecycle by age
Clear remote cache entry on report of not found

Search peers
- Propogate request to additonal peers

Downloading

Download progress status bar
Split requests across multiple sources
Auto seek additional sources
pass content thru peer
refer client to other peer
- Assisted connect to referred peer
Share partial files with other peers
- Manage paritalfile lifecycle by age
- Join ajacent or overlapping fragments
- monitor cache for external change
- validate partial fragments on restart
- maintain fragment with in-progress upload until complete
Cancel download
Move download to library

Validate integrety
manage duplicate names that are different content

Clear completed download

Uploading
- monitor library for external change
Networking
- encrypted data and key exchange
- Dynamic packet sizing
- multi-threaded TCP listener & TCP connection management
- multi-threaded UDP listener & UDP connection management
  - packet resequencing
  - lost packet rerequest
  - connection keepalive and dead connection detection
- UDP nat traversal
  - UDP listen port keepalive technique
  - UDP connection keepalive technique
  - Assistent UDP referral for nat router traversal
- UPNP router configuration
- multiple NIC support
- bandwidth throttling
- Clean shutdown notification
- Connection management
  - Connection initiation
  - Dead connection cleanup
  - Inactive connection cleanup
  - Excessive connection pearing
- known peer management
  - manage peer database lifecycle
    - Track connectabability of peers
    - Track peer value
    - Disgard outdated peer info
  - exchange peer info at connect
  - exchange peer info on request
Monitoring
- internal performance monitor and activity prioritization
- status info for user
configuration
- user reqested peer connection
- dynamic reconfiguration of listening port
- dynamic reconfiguration of network throttling
- dynamic reconfiguration of sharing directory
- dynamic reconfiguration of temp storage allocation
Future expansion
- UI communicate with app via message system so app can be split into client and server with server running as service
Help files

Background

Bunzilla was created as a planned learning activity in the .net framework, object oriented programming, concurrency, multithreading, c# programming, and experimenting in new p2p networking concepts. It is not a commerical product. I hope you enjoy using it and find it a useful tool. The product will be enhanced as time permits. If it appears this tool is getting lots of interest, I will be more committed to updating it. I'm not much of a file sharer, but it seemed like an interesting and challenging project to spend some free time on.

Index