jNetStream

jNetStream is a protocol analyzer and a sniffer. It comes with a cool set of applications and a complete Java library, packed with a super handy API.

Expand Your Protocols

There are hundreds of protocols defined, and you can easily add more using a simple NPL language. This makes it perfect for custom protocol development, grad students, and teachers in the networking field.

Common Functionality You Expect

The supplied applications give you all the usual features you'd want from a packet sniffer:

• slydecoder - this is your flexible packet decoder. Here’s what it can do:
  
  
  
  • Group packets by flows (using the -g option). For example, TCP streams will be grouped into one flow.
  
  
  • You can supply your own protocol definitions.
  
  
  • Decode multiple files at once.
  
  
  • Decode different types of capture files simultaneously.
  
  
  • This tool has the most powerful filter engine available!
  
  
  
  



• slycopy - think of this as your capture file manipulator. It lets you:
  
  
  
  • Merge multiple capture files into one output file.
  
  
  • Merge different types of capture files together.
  
  
  • Apply filters while doing so!
  
  
  • Soon, you’ll even be able to modify packets during the copy process (like removing specific headers from packets such as decapsulating VLANs).
  
  
  
  

Running jNetStream Easily

You can run both applications using the Java Runtime Environment like this:

java -jar JNetStream.jar com.voytechs.jnetstream.tools.SlyDecoder

java -jar JNetStream.jar com.voytechs.jnetstream.tools.SlyCopy

If you're feeling lazy, just use shorthand for SlyDecoder with its default main class:

java -jar JNetStream.jar

If you installed jNetStream in a different directory than /opt/jnetstream, just tweak that base directory name when running it.

What's New in This Release?

• This release brings some exciting new features and bug fixes!


• NPL protocol definitions now load on demand and let you define binding overrides yourself.


• You’ve got new options for counting packets under various models – including statistical models!


• You can count packets quickly even in huge multi-gig files!


• A lot more logging has been added using Apache CommonsLogging and Log4j to keep track of everything!