[rbldnsd] Warning: possible danger of using rbldnsd, and upcoming data format change

[David Landgren]

Matthew Sullivan wrote:

> David Landgren wrote:
[...]

>> Having an end-of-file marker on the last line of the file is perfect 
>> for this.
>>
>> One should always be wary of encumbering an application with 
>> unnecessary cruft to solve a (non-)problem that should be addressed by 
>> basic rules of hygiene.
> 
> 
> 
> EOF will not help you then have a race condition where the daemon opens 
> for reading, and something opens for writing...

Not relevant. The file is never opened for writing.

At the worst, rbldnsd will be holding the last remaining reference count 
to a file that can no longer be access from the filesystem directory 
tree, but rbldnsd *will* be able to read it in its entirety.

And even then rbldnsd will be running with stale data for one minute, 
until it stats the file, notices that it's been updated and reloads it.

David