From owner-freebsd-hackers Sun Oct 29 17:09:53 1995 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.6.12/8.6.6) id RAA20994 for hackers-outgoing; Sun, 29 Oct 1995 17:09:53 -0800 Received: from cps201.cps.cmich.edu (cps201.cps.cmich.edu [141.209.20.201]) by freefall.freebsd.org (8.6.12/8.6.6) with ESMTP id RAA20982 for ; Sun, 29 Oct 1995 17:09:51 -0800 Received: from cps201 (cps201.cps.cmich.edu [141.209.20.201]) by cps201.cps.cmich.edu (8.6.12/8.6.12) with SMTP id UAA22357 for ; Sun, 29 Oct 1995 20:09:50 -0500 Date: Sun, 29 Oct 1995 20:09:49 -0500 (EST) From: Mail Archive X-Sender: archive@cps201 To: hackers@freebsd.org Subject: New tool available: Netcat (fwd) Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-hackers@freebsd.org Precedence: bulk Thought some of you might be interested in this Matt [This will be of interest to firewallers, for reasons obvious herein or in the README that comes with it. Enjoy!] Netcat 1.0 is the initial release of a simple Unix utility which reads and writes data across network connections, using TCP or UDP protocol. It is designed to be a reliable "back-end" tool that can be used directly or easily driven by other programs and scripts. At the same time it is a feature-rich network debugging and exploration tool, since it can create almost any kind of connection you would need and has several interesting built-in capabilities. Some of netcat's major features are: Outbound or inbound connections, TCP or UDP, to or from any ports Full DNS forward/reverse checking, with appropriate warnings Ability to use any local source port Ability to use any locally-configured network source address Built-in port-scanning capabilities, with randomizer Built-in loose source-routing capability Can read command line arguments from standard input Slow-send mode, one line every N seconds Optional ability to let another program service inbound connections A very short list of potential uses: Script backends Scanning ports and inventorying services Backup handlers File transfers Server testing and simulation Firewall testing Proxy gatewaying Network performance testing Address spoofing tests Protecting X servers 1001 other uses you'll likely come up with Netcat is a product of Avian Research, and is freely available in full source form with no restrictions save an obligation to give credit where due. Get it via anonymous FTP at avian.org:/src/hacks/nc100.tgz which is a gzipped tar file. Other distribution formats can be accomodated upon request. It is also mirrored at the following [faster] sites: zippy.telcom.arizona.edu:/pub/mirrors/avian.org/hacks/nc100.tgz ftp.sterling.com:/mirrors/avian.org/src/hacks/nc100.tgz _H* 951010