WIL, Q1 2008

Programming

• Nice sed resource.
  
• Take a look at the CPU share project...
  

Life with qmail

• recordio: I noticed that if you run out of disk space in the location where recordio stores stuff, things might silently stop working. Since recordio doesn't run as root (for all the good reasons in the world), df (that you're then most likely running as root *grin*) will still report that there's a bit of space left on the device. But you'll certainly notice that lsof -i will report a bunch of recordio processes with connections in CLOSE_WAIT state...
  

Misc.

• How to map an IP address to an ASN? Take a look at the Webalizer project and download the source code. When you build it, you end up with a utility called asndb-reader that let you query a database that can map IPs to ASN numbers. Sweet. Of course, for a fee, you can by from vendors fully qualified databases. They will map IPs to ASNs and also tell you what type of business is behind it (for instance, whether it's an ISP or not.)
  

Security

• Don't try to see malice when idiocy is just a better explanation -- or, how appalling the finance industry best security practices really are
  
• I was reading the other day about an interesting way of gathering intelligence on an entity with a discreet (as in, for instance, not exactly known to DNS) web presence: create a page with a set of URLs pointing at these IPs, wait for search engines to index them and then craft custom queries to start searching for what you're looking for.
• FFSN have been around for a little while now, but it's worth pointing at this interesting recently published paper on detection and measurements of FFSN.
  

Web

• Someone pointed me at this app that will help you grapghically visualize a website.