unixwiz.net
Recovering lost ext2 Linux filesystems
http://www.unixwiz.net/techtips/recovering-ext2.html
Does this site look plain? This site uses advanced css techniques. Steve Friedl's Unixwiz.net Tech Tips. Recovering lost ext2 Linux filesystems. The procedures described here can be very dangerous if applied to the wrong drive, and it's remarkably easy to do this. Don't do this on a live machine with un-backed-up data unless you are really sure of yourself. Please be careful. Make a snapshot of the failing drive. Trying to locate the partitions. We ran some DOS-based low-level diagnostics ( TuffTEST-Pro.
unixwiz.net
Netmask Quick Reference Chart
http://unixwiz.net/techtips/netmask-ref.html
Does this site look plain? This site uses advanced css techniques. Steve Friedl's Unixwiz.net Tech Tips. Netmask Quick Reference Chart. There are plenty of these netmask references out there, but I prefer my own: hence this Tech Tip. We've never seen anybody use a network larger than a /4 (256M hosts), so we've truncated the table at that point. Point to point links only. The dividing line between the network and host parts is determined by the subnet mask. And it's often seen in 255.255.255.0. Many cons...
unixwiz.net
Steve Friedl's Unixwiz.net Tools
http://www.unixwiz.net/tools
Does this site look plain? This site uses advanced css techniques. Unixwiz.net - Software Consulting Central. Steve Friedl's Unixwiz.net Tools. In the course of my work, I've developed a very large set of tools that I use for network security or for general system administration. For some of them I've managed to package them up with proper documentation such that they can be released, and this is the home page for them. But feel free to say thanks. Mdash; added 2001-08-01. Code Red request logger. Comman...
unixwiz.net
Blocking spammers with Postfix HELO controls
http://www.unixwiz.net/techtips/postfix-HELO.html
Does this site look plain? This site uses advanced css techniques. Steve Friedl's Unixwiz.net Tech Tips. Blocking spammers with Postfix HELO controls. At the start of all SMTP transactions, the calling machine identifies itself, literally by saying "HELO" with its computer name. If cygnus.unix-girl.com. Connects to the Unixwiz.net mailserver and attempts to deliver mail:. Raquo;» 220 linux.unixwiz.net ESMTP Postfix we say. Laquo;« HELO cygnus.unix-girl.com. As the machine it's connecting to. HELO with an...
schneier.com
TrueCrypt WTF - Schneier on Security
https://www.schneier.com/blog/archives/2014/05/truecrypt_wtf.html
I have no idea what's going on with TrueCrypt. There's a good summary of the story at ArsTechnica. All have long comment threads. See also Brian Krebs. Speculations include a massive hack of the TrueCrypt developers, some Lavabit-like forced shutdown, and an internal power struggle within TrueCrypt. I suppose we'll have to wait and see what develops. Posted on May 29, 2014 at 8:02 AM. 8226; 322 Comments. Bull; May 29, 2014 8:10 AM. Bull; May 29, 2014 8:11 AM. The Open Crypto Audit Project. Doesn't TrueCr...
unixwiz.net
nbtscan - NETBIOS nameserver scanner
http://www.unixwiz.net/tools/nbtscan.html
Does this site look plain? This site uses advanced css techniques. Steve Friedl's Unixwiz.net Tools. Nbtscan - NETBIOS nameserver scanner. The Windows version of this tool MUST run in an MS-DOS window! This is a command-line tool that scans for open NETBIOS nameservers on a local or remote TCP/IP network, and this is a first step in finding of open shares. It is based on the functionality of the standard Windows tool. But it operates on a range. V1035) - Windows binary (36 kbytes). Parameter. When ru...
unixwiz.net
An Illustrated Guide to SSH Agent Forwarding
http://unixwiz.net/techtips/ssh-agent-forwarding.html
Does this site look plain? This site uses advanced css techniques. Steve Friedl's Unixwiz.net Tech Tips. An Illustrated Guide to SSH Agent Forwarding. The Secure Shell is widely used to provide secure access to remote systems, and everybody who uses it is familiar with routine password access. This is the easiest to set up, is available by default, but suffers from a number of limitations. These include both security and usability issues, and we hope to cover them here. How Key Challenges Work. We'll not...
unixwiz.net
Reading C type declarations
http://unixwiz.net/techtips/reading-cdecl.html
Does this site look plain? This site uses advanced css techniques. Steve Friedl's Unixwiz.net Tech Tips. Reading C type declarations. Even relatively new C programmers have no trouble reading simple C declarations such as. Foo is an array of 5 ints. Foo is a pointer to char. Foo is a function returning a double. But as the declarations get a bit more involved, it's more difficult to know exactly what you're looking at. Char *(*(* foo[][8])() [];. The variable so declared may be well out of reach). But th...
unixwiz.net
Intel x86 JUMP quick reference
http://www.unixwiz.net/techtips/x86-jumps.html
Does this site look plain? This site uses advanced css techniques. Steve Friedl's Unixwiz.net Tech Tips. Intel x86 JUMP quick reference. Getting the sense for jumps and flags has long been a troublesome area for me, especially since the Intel assembler book shows 32 of these, all with similar-sounding names. Looking more closely I found that many of the instructions were synonyms for each other, and in practice the whole gamut is not needed, and in the process found that my copy of Intel's. Set if low-or...