What could you do with your code in 20 Lines or Less? That's the question I ask (sometimes?) every week for the DevCentral community, and every week I go looking to find cool new examples that show just how flexible and powerful iRules can be without getting in over your head.

This week nitass and hoolio deliver the 1-2-3 punch with 3 cool iRules to perform various tasks that I deem useful, or interesting, or...both. We get a look at dealing with destination servers with a dynamic IP, handling SSL and non SSL connections on the same VIP to proxy both seamlessly, and selecting a hostname based on destination. No, that isn't backwards, you heard that right. Hostname based on destination, not destination based on hostname. Just the kind of fun stuff I love looking at! So let's get to it.


CLIENTSSL_HANDSHAKE without a client SSL profile


We've seen a similar take before, but this is a new look and a good one, courtesy of hoolio. If you're looking to process HTTP and HTTPS traffic on the same VIP, this iRule will get you there. Keep in mind that it's using a couple of tricks. One is hiding the SSL::cipher command within an eval, and the other is using the catch command to prevent the iRule from dumping the connection based on a TCL error in non SSL cases. While this works, it's good to know that this is using a bit of wizardry to achieve the goal. At some point in the future there may well be a more straight-forward way to do this.