Empties Source Forge page at empty.sf.net describes the utility as one that provides an interface to execute and interact with processes under pseudo-terminal sessions. This is pretty cool because you can use it to program shell scripts which communicate with interactive programs like telnet, ftp or ssh.
And while TCL/Expect does the same thing, empty may be a better choice because it can be invoked directly from the shell, it doesn't require TCL, perl, python or any other language, it's super small and simple and has already been ported to most *nix flavors.
Installation is pretty simple, either download the source from empties website, untar it and ""make all install clean"", or grab it from your repo. In ubuntu that's apt-get install empty-expect
The cool thing about the way it works is that everything is based on files.
empty -f -i input.fifo -o output.fifo -p empty.pid -L empty.log ssh root@localhost empty -w -i output.fifo -o input.fifo continue 'yn' empty -w -i output.fifo -o input.fifo assword 'lamepasswordn' empty -w -i output.fifo -o input.fifo root@ 'topn'
With all the privacy issues we've been hearing about lately, (Facebook's always strange updates; Google's new policy, etc), it almost seems impossible to keep your private data private!
We always hear about those problems we face with third party advertisers, cookies, and social search results, but it seems like everyone gets all up in arms about it, but almost no one goes on the defense and stops it from happening. Sure, people like you and me know how to disable cookies and we've deleted our cache's and search results in Google but we still have to teach the masses how to do it as well.
We still have a friend in the world who cares by the name of Disconnect, a company that was founded by a couple of ex-Googlers, Brian Kennish and Austin Chau, with Casey Oppenheim.
So what are they doing? Well, Disconnect is working on making your private data private again by disabling sharing with third parties and soon customizing your ability to share with whom you want.
How does it work? Disconnect is a small add-on for your browser (for me, Chrome) that you can find in your browser's webstore. Disconnect works in the background, seemlessly blocking the collection of your searches, sites visited, etc from Google, Twitter, Facebook, Digg, and Yahoo. It'll even let you depersonalize searches on Google and Yahoo by blocking cookies while you're still logged in.
Hex over TCP with Echo and Netcat
Ever needed to send some hex in TCP form over to a port on an IP?
Well, you can do that with Echo and Netcat.
echo -n -e ""x01x18x03"" | nc 10.73.31.1 80
The -n supresses outputting the trailing newline. The -e enables the interpretation of backslash escapes -- allowing us to send hex codes.
This can be pretty useful if, say, you reverse engineered your friends alarm system by doing a little packet capture and analysis and found that the entry system relies on a series of vendor hard-coded 3 bit packets. Security folks, it's not just for the WOPR folks.
Disconnecting TCP sessions with Ngrep
While Disconnect.me is pretty slick, and
ngrep -q -d any 'facebook.com' -K 10
Of course the regular expression can be expanded to include more domains and probably prettied up for performance. The important bit here is that the -K option will kill TCP connections matching the expression.
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This time on the show, automating interactive tasks in Linux, preventing your browser sessions from being tracked, graphical command line disk usage utilities, and pushing hex over TCP with Echo. All that and more this time on Hak5!
If you're into Hak5 you'll love our new show by hosts Darren Kitchen and Shannon Morse. Check out http://www.revision3.com/haktip
Whether you're a beginner or a pro, http://www.revision3.com/haktip is essential viewing for current and aspiring hackers, computer enthusiasts, and IT professionals. With a how-to approach to all things Information Technology, HakTip breaks down the core concepts, tools, and techniques of Linux, Wireless Networks, Systems Administration, and more
And let's not forget to mention that you can follow us on http://www.twitter.com/hak5 and http://www.facebook.com/technolust, http://revision3.com/hak5/subscribe to the show and get all your Hak5 goodies, including the infamous http://hakshop.com/collections/frontpage/products/wifi-pineapple over at http://hakshop.com . If you have any questions or suggestions please feel free to contact us at firstname.lastname@example.org.