nextincr in krb5int_dns_init too small

[Daniel Colascione]

krb5int_dns_init has a conventional malloc-and-realloc-until-it-fits
loop, but inside the loop body, we're calling res_nsearch, which can do
non-trivial work. It'd be better to increase the initial guess from 2048
to something bigger; even 4k is a trivial amount of memory these days,
and I'm getting 2786-byte responses.

[Greg Hudson]

Post by Daniel Colascione
krb5int_dns_init has a conventional malloc-and-realloc-until-it-fits
loop, but inside the loop body, we're calling res_nsearch, which can do
non-trivial work. It'd be better to increase the initial guess from 2048
to something bigger; even 4k is a trivial amount of memory these days,
and I'm getting 2786-byte responses.

I am preparing a pull request to update the buffer size to 4K. Am I
correct to asssume that these 2786-byte responses include DNSSEC signatures?

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