Require host header

Would it be ok to go with 1 Irule & 1 Datagroup, but your datagroup entries has to be updated as & when you start applying this Irule to your required VS.

Logic:

Create a datagroup with records matching the VS name & its values with urls with comma separated in case multiple SAN's.

virtual_1 {
	data www.google.com
}
virtual_2 {
	data www.facebook.com,www.messenger.com
}

Create an irule to capture the host header & VS name.

set virtual [findstr [virtual name] "" 8 ]

Then use class match to lookup the VS & get the values of it & set to a variable, this would tell what all values are whitelisted for that virtual.

Now do a if condition & check if the host header matches to the variable, if yes allow. else drop.

In case of multiple values, use foreach cmd & do your condition check.

This Irule can be applied as generic Irule. But make sure you add the right records before applying.

Let me know what you think.