In message <20140917211336.GT89960@dyn.com>, Andrew Sullivan writes:
On Wed, Sep 17, 2014 at 04:57:52PM -0400, Jay Ashworth wrote:
----- Original Message ----- No, I was confusing you for someone who understood -- as everyone else here seems to have -- that I meant "querying for an A, AAAA, or MX record".
You want to return NXDOMAIN for a name only when the QTYPE is A, AAAA, or MX, and not everything else? Presumably you don't want to do negative caching?
A
-- Andrew Sullivan Dyn, Inc. asullivan@dyn.com v: +1 603 663 0448
You want gethostbyname, getaddrinfo to return HOST_NOT_FOUND/EAI_NONAME if a single label is entered and is not matched by <label>.<search-list-element>. localhost is special cased. You want res_search() to return HOST_NOT_FOUND if a single label is entered and is not matched by <label>.<search-list-element>. You want res_query() and other tools that look in the DNS and are *not* searching to return whatever is in the DNS. If you have a new interface that looks for SRV records you want that to fail if <srv-prefix>.<label>.<search-list-element> is not found unless searching is explictly disabled. This allows for things like "_whois._tcp.tld SRV ...." to work. Search lists are for hosts and host like things. Resolver libraries have different interfaces for different purposes. Single label hostnames for reaching non local equipment was deliberately phase out in the 1980's as it was clearly a bad concept. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org