Authenticate customer using SSL client certificate or LDAP

Is it possible to call/use existing IRules within an IRule? I have a client ssl certificate IRule from previous post and the default IRule for LDAP, which both work great. I would like to try the following:

 

 

1. If you have a client certificate --> use client certificate IRule

 

2. If you don't have a client certificate --> use LDAP IRule

 

 

I tried to work with the dual authentication rule that was given, however I could not get it to work (I am a novice at both programming and editing IRules).

 

 

Thank you very much for your help,

 

Rob