Method exchange

framework/dns/dnssec.go:87–111

(ctx context.Context, msg *dns.Msg)

}

func (e ExtResolver) exchange(ctx context.Context, msg *dns.Msg) (*dns.Msg, error) {
	var resp *dns.Msg
	var lastErr error
	for _, srv := range e.Cfg.Servers {
		resp, _, lastErr = e.cl.ExchangeContext(ctx, msg, net.JoinHostPort(srv, e.Cfg.Port))
		if lastErr != nil {
			continue
		}

		if resp.Rcode != dns.RcodeSuccess {
			lastErr = RCodeError{msg.Question[0].Name, resp.Rcode}
			continue
		}

		// Diregard AD flags from non-local resolvers, likely they are
		// communicated with using an insecure channel and so flags can be
		// tampered with.
		if !isLoopback(srv) {
			resp.AuthenticatedData = false
		}

		break
	}
	return resp, lastErr
}

func (e ExtResolver) AuthLookupAddr(ctx context.Context, addr string) (ad bool, names []string, err error) {
	revAddr, err := dns.ReverseAddr(addr)