irule meaning

hope this helps.

[root@ve1024:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.79:80
   ip protocol 6
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@ve1024:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
   log local0. "\[HTTP::uri\]: [HTTP::uri]"
   log local0. "\[findstr [HTTP::uri] ? 8 3\]: [findstr [HTTP::uri] ? 8 3]"
}
}

[root@ve1024:Active] config  curl -I http://172.28.19.79/test?1234567890abcdef
HTTP/1.1 404 Not Found
Date: Sat, 30 Jun 2012 04:04:46 GMT
Server: Apache/2.2.3 (CentOS)
Content-Type: text/html; charset=iso-8859-1

[root@ve1024:Active] config  tail -f /var/log/ltm
Jun 29 21:04:34 local/tmm info tmm[4861]: Rule myrule : [HTTP::uri]: /test?1234567890abcdef
Jun 29 21:04:34 local/tmm info tmm[4861]: Rule myrule : [findstr /test?1234567890abcdef ? 8 3]: 890

Thanks for your response nitass ,

 

 

So I guess this iRule extracts the three characters after 8 ? starting with ? character ?

it finds ? character in url (HTTP::uri), skip 8 characters and return next 3 characters.

 

 

findstr wiki

 

https://devcentral.f5.com/wiki/irules.findstr.ashx

Great thanks ! :)