On 08/03/2012 05:48 PM, Martin McCormick wrote:
Can one read the TTL for a given lookup in
getaddrinfo?
I don't believe so.
Better yet, is there a listing of the entire range of
values one can read from all the structures?
The getaddrinfo() interface is specified in RFC 3493.
Specific platforms might extend the "struct addrinfo" (maybe?) but AFAIK
most / all implementations just conform to the basic RFC.
I wrote an application years ago to let us change the
name of a host. The old code uses zone transfer to pull in the
whole zone, actually several zones in to a pile of A records. We
look for the old name, replace it with the new name and then do
a delete and add.
I don't understand this I'm afraid.
If getaddrinfo contains this value, the replace
application can run much faster, just doing one lookup, and the
new record we write back will keep whatever value we originally
had.
If you want TTL, you will need to use DNS-specific functions like the
res_* API. You need to be sure you are querying the master, otherwise
the TTL will be the one from cache, not the "real" value.
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