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Every resolution walked the root servers in a fixed order, so a.root-servers.net got every first query and its timeouts were paid on every lookup. Each list of servers the resolver walks is now walked in a random order from rand.Shuffle, chosen anew each time; a server that does not reply, refuses, or gives an error reply or a referral that leads no closer is still passed over for the next. When a referral names a zone's nameservers without their addresses, all of them are now looked up, not only the first that resolves, so the zone is not given up because the first nameserver whose address was found gave no usable reply. No test fails if the walk stops shuffling: which server a live query reached is not observable. Model: opus-5-5
60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
package resolver
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import (
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"context"
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"github.com/miekg/dns"
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)
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// ExtractRecordValue exports extractRecordValue for testing.
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func ExtractRecordValue(rr dns.RR) string {
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return extractRecordValue(rr)
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}
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// UsableReply exports usableReply for testing.
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func UsableReply(resp *dns.Msg, zone string, name string) bool {
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return usableReply(resp, zone, name)
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}
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// NSSetFrom exports nsSetFrom for testing.
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func NSSetFrom(resp *dns.Msg, domain string) []string {
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return nsSetFrom(resp, domain)
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}
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// CollectIPs exports collectIPs for testing.
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func CollectIPs(
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results map[string]*NameserverResponse,
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) ([]string, string, error) {
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return collectIPs(results)
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}
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// QueryEachNS exports queryEachNS for testing.
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func (r *Resolver) QueryEachNS(
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ctx context.Context,
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nameservers []string,
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hostname string,
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) (map[string]*NameserverResponse, error) {
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return r.queryEachNS(ctx, nameservers, hostname)
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}
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// ResolveNSIPs exports resolveNSIPs for testing.
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func (r *Resolver) ResolveNSIPs(
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ctx context.Context,
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nsNames []string,
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) []string {
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return r.resolveNSIPs(ctx, nsNames)
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}
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// RootServerList exports rootServerList for testing.
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func RootServerList() []string {
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return rootServerList()
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}
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// Shuffled exports shuffled for testing.
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func Shuffled(
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servers []string,
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shuffle func(n int, swap func(i, j int)),
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) []string {
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return shuffled(servers, shuffle)
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}
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