Forum Discussion

Akshay_SK's avatar
Akshay_SK
Icon for Nimbostratus rankNimbostratus
May 16, 2021

Log matched/detected pattern in switch statement.

I have been trying to write a security iRule for my organization that provides a basic security. Here is my code snippet where I am matching the useragent value with the provided patterns.

 

switch -glob $useragent {

"*havij*" -

"*zmeu*" -

"*sqlmap*" {

 

            log local0. "Blocking this request due to detected user agent : "

 

reject

}

}

 

How do I print the detected pattern here? If I try to print the $useragent, I will be logging the entire useragent value instead of only the detected pattern. Any help would be greatly appreciated.

BIG-IP
iRules
security
  • Dario_Garrido's avatar
    Dario_Garrido
    Icon for MVP rankMVP
    May 16, 2021

    Hello Akshay.

    It's no possible to do it that way. You should differentiate each pattern.

    switch -glob $useragent {
	"*havij*" {
		log local0. "Blocking this request due to detected user agent : *havij*"
		reject
	}
	"*zmeu*" {
		log local0. "Blocking this request due to detected user agent : *zmeu*"
		reject
	}
	"*sqlmap*" {
		log local0. "Blocking this request due to detected user agent : *sqlmap*"
		reject
	}
}

    Regards,

    Dario.