Using configuration items in strings

[Arran Cudbard-Bell]

> 	}
> 
>  Will cause the "sql" reference to be ignored.
> 
>  Note that you CANNOT do:
> 
> 		if ("${foo}") {
> 
> 		}

Hm, no. Using RFC terms, and assuming were going for optimum efficiency:

if (${foo})

MUST NOT be optimised away, it is a attribute or rcode check with the value of the CONF_PAIR ${foo}

if ('${foo}') 

MUST be optmised away, it is a string literal.

Where ${foo} -> 'bar'

if ("${foo}") 

SHOULD be optimised away, it is an XLAT expansion only containing string literals.

Where ${foo} -> '%{User-Name}'

MUST NOT be optimised away, it is an XLAT expansion containing an attribute reference.

However, actually testing the code it seems optimisation isn't working as expected...

Where ${foo} -> 'User-Name'

authorize {
        if (!'${foo}') {
                ok  
        }   

        if (!"${foo}") {
                ok  
        }   

        if (!${foo}) {
                ok  
        }   

        if (!('${foo}' == 'bar')) {
                ok  
        }  
}

Ready to process requests.
rad_recv: Access-Request packet from host 127.0.0.1 port 51784, id=52, length=38
	User-Password = 'foo'
(0) # Executing section authorize from file /usr/local/freeradius-3.0.x/etc/raddb/sites-enabled/default
(0)   authorize {
(0)   ? if (!'User-Name') 
(0)   ? if (!'User-Name')  -> FALSE
(0)   ? if (!"User-Name") 
(0) 	expand: "User-Name" -> 'User-Name'
(0)   ? if (!"User-Name")  -> FALSE
(0)   ? if (!User-Name) 
(0)   ? if (!User-Name)  -> TRUE
(0)   if (!User-Name)  {
(0)    [ok] = ok
(0)   } # if (!User-Name)  = ok
(0)   ? if (!('User-Name' == 'bar')) 
(0)   ? if (!('User-Name' == 'bar'))  -> TRUE
(0)   if (!('User-Name' == 'bar'))  {
(0)    [ok] = ok
(0)   } # if (!('User-Name' == 'bar'))  = ok

But I may be miss-understanding on how it's meant to operate.

Arran Cudbard-Bell <a.cudbardb at freeradius.org>
FreeRADIUS Development Team

FD31 3077 42EC 7FCD 32FE 5EE2 56CF 27F9 30A8 CAA2

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