circular ACLs, named and named-checkconf inconsistency

Stefan Puiu stefanpuiu at
Thu Mar 3 14:20:49 UTC 2005


I've noticed an inconsistency between BIND's behaviour and 
named-checkconf's with respect to configuration files that contain 
constructs like the following:

acl "ddns1" {
    {  ddns2; } ;
acl "ddns2" {
    {  10.x.x.x;ddns1; } ;

Then further down:

options {
allow-query { ddns1; };

named-checkconf doesn't report any problems, while BIND crashes with it 
(tested on Windows 2000 with BIND 9.3.1rc1; didn't test this on UNIX).

Of course this is a brain damaged example that nobody would use in their 
configuration file. However, if you're not careful enough you can easily 
screw this up by defining a cycle in the ACL graph (something less 
obvious than the above). It would be nice if named-checkconf would also 
check for cycles in nested ACLs. Should I make a feature request and 
post it on bind9-bugs? What's the procedure?

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