clawbot
008ec5d13a
check / check (push) Canceled after 0s
Looking up a nameserver's own address followed only the addresses a referral gave, so a nameserver whose zone is delegated without them, such as a.ntpns.org of pool.ntp.org, never resolved. The walk to a name's nameservers looked addresses up only when a referral gave none. Both now go through queryZone, which asks the nameservers whose addresses the referral gives first and, if none of them gives a usable reply, looks up and asks the others. maxLookupDepth stops lookups three deep, so delegations that point at each other still end; when the limit is why no address was found, the error is ErrLookupDepthExceeded, not "no address". Model: opus-5-5
47 lines
1.5 KiB
Go
47 lines
1.5 KiB
Go
package resolver
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import "errors"
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// Sentinel errors returned by the resolver.
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var (
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// ErrNoNameservers is returned when no authoritative NS
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// could be discovered for a domain.
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ErrNoNameservers = errors.New(
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"no authoritative nameservers found",
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)
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// ErrNoNameserverAnswered is returned when every nameserver
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// asked about a name timed out, failed or returned a referral,
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// so whether the name has addresses is unknown.
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ErrNoNameserverAnswered = errors.New("no nameserver answered")
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// ErrUnusableReply is returned when a server replied with an
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// error such as SERVFAIL, or with a referral that leads no
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// closer to the name asked about.
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ErrUnusableReply = errors.New(
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"reply is an error or a referral that leads no closer",
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)
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// ErrIntercepted is returned when every root server refused a
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// query. Root servers refuse no query, so the refusals came from
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// something on the network answering in their place.
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ErrIntercepted = errors.New("this network intercepts DNS queries")
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// ErrCNAMEDepthExceeded is returned when a CNAME chain
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// exceeds MaxCNAMEDepth.
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ErrCNAMEDepthExceeded = errors.New(
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"CNAME chain depth exceeded",
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)
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// ErrLookupDepthExceeded is returned when nameserver addresses
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// were not looked up because lookups were already maxLookupDepth
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// deep, one inside another.
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ErrLookupDepthExceeded = errors.New(
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"lookups of nameserver addresses go too deep",
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)
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// ErrContextCanceled wraps context cancellation for the
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// resolver's iterative queries.
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ErrContextCanceled = errors.New("context canceled")
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)
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