Re: getaddrinfo and TTL
Phil Mayers writes: 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. I appreciate this information as it sounds like I am using the wrong tool for the job. I only want to look up an A record by name and have the fields in a structure, evaluate those data and then possibly delete that record or or write a new one that has been modified. I thought that getaddrinfo was what I needed to use to do essentially a nslookup in C. Martin ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
Re: getaddrinfo and TTL
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. ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
getaddrinfo and TTL
Can one read the TTL for a given lookup in getaddrinfo? Better yet, is there a listing of the entire range of values one can read from all the structures? 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. 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. Many thanks. Martin McCormick WB5AGZ Stillwater, OK Systems Engineer OSU Information Technology Department Telecommunications Services Group ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
