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SANTHOSHKUMAR_S's avatar
SANTHOSHKUMAR_S
Icon for Nimbostratus rankNimbostratus
Aug 01, 2016

irule for x forwarder

We have virtual server with wildcard certificate installed , like *apps.abc.com . I need have x forwarder enabled when there is request for name1.apps.abc.com , Similarly I need to disable x forwarde...
application delivery
iRules
Yann_Desmarest's avatar
Yann_Desmarest
Icon for Cirrus rankCirrus

Hi,

You can also use switch or a datagroup :

using SWITCH :

    when HTTP_REQUEST {
        switch [HTTP::host] {
            "name1.apps.abc.com" - 
            "namex.apps.abc.com" {
                 HTTP::header remove "X-Forwarded-For"
                 or do nothing
            }
            default {
                HTTP::header insert "X-Forwarded-For" [getfield [IP::client_addr] "%" 1]
            }
        }
    }

Using DATAGROUPS

    when HTTP_REQUEST {
        if { [class match [HTTP::host] contains X_FORWARD_HOST] } {
            HTTP::header insert "X-Forwarded-For" [getfield [IP::client_addr] "%" 1]
        } else {
             HTTP::header remove "X-Forwarded-For"
             or do nothing
        }
    }

Once you know the logic of those commands, you can choose the way you want to manage your exceptions.

Yann_Desmarest's avatar
Yann_Desmarest
Icon for Cirrus rankCirrus
Aug 01, 2016

Hi,

 

If you have only one exception so I suggest to use a single if condition with the host exception in direct within the irule code.

 

If you have several exceptions, you can thing implementing the switch version of the irule.

 

And if you have lot of exceptions, I recommend to use datagroups.

 

For single if condition :

 

when HTTP_REQUEST {
    if { !([HTTP::host] eq "name1.apps.abc.com") } {
        HTTP::header insert "X-Forwarded-For" [getfield [IP::client_addr] "%" 1]
    }
}

Hope it helps you to make your choice.