TCPreen is a simple tool to monitor and analyze data transmitted between clients and servers through connection-oriented streams data such as a TCP sessions; it supports TCP over either IPv4 or IPv6. This tool focuses on the data stream (software/socket layer), not on the lower level transmission protocol as packet sniffers do.
TCPreen listens on a TCP port and wait for incoming connections to come in. Then, it forwards data sent by the connecting client to another server port (possibly on another computer) and forwards server responses back to the client.
TCPreen can display data on your console in real-time and/or save it to log files for later reference. Various display formats are available. While it was originally meant to help developers reverse-engineer TCP-based protocols, it can also be very useful to debug network server or client software or for a system administrator to monitor a TCP service.
For more informations, please refer to the included manual page.
TCPreen is an open-source program. You are free to download, use, modify and redistribute it. You can download the latest official releases, or use the GIT repository if you are an experienced user. TCPreen is currently distributed under the terms of the GNU General Public License, version 2 of the license.
Copyright © 2002-2007 Rémi Denis-Courmont.