bug report: "too many SRV records" becomes "no SRV records"

[Richard Silverman]

On Thu, 10 Jun 2010, Tom Yu wrote:

> "Richard E. Silverman" <res at qoxp.net> writes:
>
>> In 1.8.1, there is the following code in src/lib/krb5/os/dnsglue.c:
>>
>>    krb5int_dns_init(struct krb5int_dns_state **dsp,
>>                     char *host, int nclass, int ntype)
>>    {
>>    ...
>>      nextincr = 2048;
>>      maxincr = INT_MAX;
>>    ...
>>
>> One day, due to an error, the number of KDC SRV records for one of our
>> realms doubled from 27 to 54... and KDC lookups via DNS prompty broke.  I
>> bumped up the nextincr value above, and it started working again.
>> Probably not the right fix, but just letting you know that there's a bug
>> here.
>
> What platform/OS is this on?  A "too-large" response should result in
> res_nsearch() returning the actual size.  If it's returning -1
> instead, I can see it causing trouble.  Are you willing to run stuff
> under a debugger to see what res_nsearch() actually returns there?

Sure; I'll do that as soon as I get a chance.  Thanks.