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8a6f48b455
Updates tailscale/tailscale#13326 Adds a CLI subcommand to perform DNS queries using the internal DNS forwarder and observe its internals (namely, which upstream resolvers are being used). Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package dnstype
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import (
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"errors"
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"strings"
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"golang.org/x/net/dns/dnsmessage"
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)
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// StringForType returns the string representation of a dnsmessage.Type.
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// For example, StringForType(dnsmessage.TypeA) returns "A".
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func StringForDNSMessageType(t dnsmessage.Type) string {
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switch t {
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case dnsmessage.TypeAAAA:
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return "AAAA"
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case dnsmessage.TypeALL:
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return "ALL"
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case dnsmessage.TypeA:
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return "A"
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case dnsmessage.TypeCNAME:
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return "CNAME"
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case dnsmessage.TypeHINFO:
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return "HINFO"
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case dnsmessage.TypeMINFO:
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return "MINFO"
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case dnsmessage.TypeMX:
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return "MX"
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case dnsmessage.TypeNS:
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return "NS"
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case dnsmessage.TypeOPT:
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return "OPT"
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case dnsmessage.TypePTR:
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return "PTR"
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case dnsmessage.TypeSOA:
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return "SOA"
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case dnsmessage.TypeSRV:
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return "SRV"
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case dnsmessage.TypeTXT:
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return "TXT"
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case dnsmessage.TypeWKS:
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return "WKS"
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}
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return "UNKNOWN"
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}
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// DNSMessageTypeForString returns the dnsmessage.Type for the given string.
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// For example, DNSMessageTypeForString("A") returns dnsmessage.TypeA.
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func DNSMessageTypeForString(s string) (t dnsmessage.Type, err error) {
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s = strings.TrimSpace(strings.ToUpper(s))
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switch s {
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case "AAAA":
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return dnsmessage.TypeAAAA, nil
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case "ALL":
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return dnsmessage.TypeALL, nil
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case "A":
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return dnsmessage.TypeA, nil
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case "CNAME":
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return dnsmessage.TypeCNAME, nil
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case "HINFO":
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return dnsmessage.TypeHINFO, nil
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case "MINFO":
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return dnsmessage.TypeMINFO, nil
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case "MX":
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return dnsmessage.TypeMX, nil
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case "NS":
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return dnsmessage.TypeNS, nil
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case "OPT":
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return dnsmessage.TypeOPT, nil
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case "PTR":
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return dnsmessage.TypePTR, nil
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case "SOA":
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return dnsmessage.TypeSOA, nil
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case "SRV":
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return dnsmessage.TypeSRV, nil
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case "TXT":
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return dnsmessage.TypeTXT, nil
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case "WKS":
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return dnsmessage.TypeWKS, nil
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}
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return 0, errors.New("unknown DNS message type: " + s)
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}
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