[dns-operations] wrapsrv -- DNS SRV record command line wrapper

[Jeroen Massar]

Mark Andrews wrote:
> In message <4A4C671C.70109 at spaghetti.zurich.ibm.com>, Jeroen Massar writes:
>> Robert Edmonds wrote:
>>> i couldn't find any utility that wraps the SRV record lookup and
>>> selection algorithm for commands that don't natively support the SRV
>>> record, so i wrote my own.
>> When I saw the title I thought you made an LD_PRELOAD trick, because
>> that is one way to do it and actually allows one to also have the
>> wrapping work when the hostnames/ports are in configuration files.
>>
>> I just have a hope that programs will be converted to use the nice
>> getaddrinfo() loop, as then they are all SRV aware (if the backend
>> getaddrinfo() respects SRV of course, which it does not always do...)
> 
> 	Which it shouldn't do until there is a posix extension that
> 	defines how to do it.  Hacks like this are what makes writing
> 	portable software a nightmare.  You really need to be able
> 	to signal that you want SRV processing or not to be done
> 	by getaddrinfo().  It should not be done by default.  That
> 	way leads to unexpected consequences.

True true. But that basically means that all existing software has to be
updated for it to support SRV, unless they are themselves already doing
SRV lookups... which is generally a function that the OS resolver
libraries don't support (especially not asynch) :(

Greets,
 Jeroen

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