For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

Matt_Williamson's avatar
Matt_Williamson
Icon for Nimbostratus rankNimbostratus
Mar 29, 2005

iRule to persist on tcp_content

Hi all, I'm trying to write a rule that will search the first 2500 bytes of tcp_content for the "USERNAME=" string and then persist on the next 7 characters after that. Here is my original attempt. ...
application delivery
dev
devops
iRules
Matt_Williamson's avatar
Matt_Williamson
Icon for Nimbostratus rankNimbostratus
Mar 30, 2005
Hi, the script searches for the string "USERNAME=" in the 2500 bytes of tcp data collected. The way the actual stream looks is like this......

 

 

Displayt..0t..Env.31t..USERNAME=s009999t..Env.30t..

 

 

The 9 and the "t" tell it to start 9 bytes after "USERNAME=" (since it's 9 bytes long) and stop at "t". This way it's reading "s009999" which is the userid I want to persist on. The value in the "t" position can be what ever fits for you. For the streams I'm looking at they are separted by "t..".

 

 

Cheers,

 

 

Matt