GENWiki

Premier IT Outsourcing and Support Services within the UK

User Tools

Site Tools


archive:programming:netcat.blurb

Netcat 1.10 is an updated release of Netcat, 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
Hex dump of transmitted and received data
Optional ability to let another program service established connections
Optional telnet-options responder

A very short list of potential uses:

Script backends
Scanning ports and inventorying services, automated probes
Backup handlers
File transfers
Server testing, simulation, debugging, and hijacking
Firewall testing
Proxy gatewaying
Network performance testing
Address spoofing tests
Protecting X servers
1001 other uses you'll likely come up with

Changes between the 1.00 release and this release:

Better portability -- updated generic.h and Makefile [thanx folks!]
Indication of local-end interface address on inbound connections
That's *Dave* Borman's telnet, not Paul Borman...
Better indication of DNS errors
Total byte counts printed if -v -v is used
A bunch of front-end driver companion programs and scripts
Better handling of stdin arguments-plus-data
Hex-dump feature
Telnet responder
Program exec works inbound or outbound now

Netcat and the associated package 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/nc110.tgz which is a gzipped tar file and not to be confused with its version 1.00 precursor, nc100.tgz. Other distribution formats can be accomodated upon request. Netcat is also mirrored at the following [faster] sites:

zippy.telcom.arizona.edu:/pub/mirrors/avian.org/hacks/nc110.tgz
ftp.sterling.com:/mirrors/avian.org/src/hacks/nc110.tgz
coast.cs.purdue.edu:/pub/tools/unix/netcat/nc110.tgz
ftp.rge.com:/pub/security/coast/mirrors/avian.org/netcat/nc110.tgz

_H* 960320

/data/webs/external/dokuwiki/data/pages/archive/programming/netcat.blurb.txt · Last modified: 2001/07/25 15:28 by 127.0.0.1

Was this page helpful?-10+1

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki