mmp / vsniff

Small network traffic sniffer

vsniff

vsniff is a simple network sniffer that records traffic on a single connection to a specified remote server. For example,

$ vsniff -local :5000 -remote example.com:1234

waits for a connection on the local port 5000. When one arrives, it connects to example.com:1234 and records the traffic on the connection, saving it to a file in the current directory.

The proximate use for vsniff is to record VATSIM network traffic for the vice client. For this one can just run:

$ vsniff

In this case, vsniff listens to the local port 6809, ready for a proper VATSIM client (e.g., VRC) to connect, at which point it completes the connection to VATSIM for VRC. The recorded session file can later be played back by vice using its built-in "replay" functionality.

To build vsniff from source, run go install github.com/mmp/vsniff@latest. Alternatively, binaries for Windows and OSX can be downloaded from the releases page.