RES_DNSRCH
#define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
ac->ac_options = RES_RECURSE | RES_DEFNAMES | RES_DNSRCH;
PRINTOPT(RES_DNSRCH, "DNSRCH");
(as->as_ctx->ac_options & RES_DNSRCH || (
{ "DNSRCH", RES_DNSRCH },