Forum Discussion

sidiov's avatar
sidiov
Icon for Nimbostratus rankNimbostratus
Aug 23, 2011

Trouble with a irule using a data group

I am attempting to drop several user agent headers that hit a website consistantly with bad traffic, I wanted to use a data group for a list of agents, but when i use it, it drops all connections. ...
application delivery
dev
devops
iRules
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Aug 23, 2011
Actually, the issue is with the hyphens in the datagroup name. Can you change them to underscores or wrap the datagroup name inthe iRule in curly braces: 

when HTTP_REQUEST {
   if {[class match [string tolower [HTTP::header "User-Agent"]] contains {danger-user-agents}] } { drop }
}

Or if you change the datagroup name:

when HTTP_REQUEST {
   if {[class match [string tolower [HTTP::header "User-Agent"]] contains danger_user_agents}] } { drop }
}

Without the curly braces, the hyphen in TCL (and iRules) breaks up the variable (or class) name.

Aaron