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1Netcat 1.10 is an updated release of Netcat, a simple Unix utility which reads
2and writes data across network connections using TCP or UDP protocol. It is
3designed to be a reliable "back-end" tool that can be used directly or easily
4driven by other programs and scripts. At the same time it is a feature-rich
5network debugging and exploration tool, since it can create almost any kind of
6connection you would need and has several interesting built-in capabilities.
7
8Some of netcat's major features are:
9
10 Outbound or inbound connections, TCP or UDP, to or from any ports
11 Full DNS forward/reverse checking, with appropriate warnings
12 Ability to use any local source port
13 Ability to use any locally-configured network source address
14 Built-in port-scanning capabilities, with randomizer
15 Built-in loose source-routing capability
16 Can read command line arguments from standard input
17 Slow-send mode, one line every N seconds
18 Hex dump of transmitted and received data
19 Optional ability to let another program service established connections
20 Optional telnet-options responder
21
22A very short list of potential uses:
23
24 Script backends
25 Scanning ports and inventorying services, automated probes
26 Backup handlers
27 File transfers
28 Server testing, simulation, debugging, and hijacking
29 Firewall testing
30 Proxy gatewaying
31 Network performance testing
32 Address spoofing tests
33 Protecting X servers
34 1001 other uses you'll likely come up with
35
36Changes between the 1.00 release and this release:
37
38 Better portability -- updated generic.h and Makefile [thanx folks!]
39 Indication of local-end interface address on inbound connections
40 That's *Dave* Borman's telnet, not Paul Borman...
41 Better indication of DNS errors
42 Total byte counts printed if -v -v is used
43 A bunch of front-end driver companion programs and scripts
44 Better handling of stdin arguments-plus-data
45 Hex-dump feature
46 Telnet responder
47 Program exec works inbound or outbound now
48
49Netcat and the associated package is a product of Avian Research, and is freely
50available in full source form with no restrictions save an obligation to give
51credit where due. Get it via anonymous FTP at avian.org:/src/hacks/nc110.tgz
52which is a gzipped tar file and not to be confused with its version 1.00
53precursor, nc100.tgz. Other distribution formats can be accomodated upon
54request. Netcat is also mirrored at the following [faster] sites:
55
56 zippy.telcom.arizona.edu:/pub/mirrors/avian.org/hacks/nc110.tgz
57 ftp.sterling.com:/mirrors/avian.org/src/hacks/nc110.tgz
58 coast.cs.purdue.edu:/pub/tools/unix/netcat/nc110.tgz
59 ftp.rge.com:/pub/security/coast/mirrors/avian.org/netcat/nc110.tgz
60
61_H* 960320