337 lines
7.3 KiB
Go
337 lines
7.3 KiB
Go
// SPDX-License-Identifier: BSD-3-Clause
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package query
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import (
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"encoding/hex"
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"encoding/json"
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"encoding/xml"
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"errors"
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"fmt"
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"strconv"
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"strings"
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"time"
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"git.froth.zone/sam/awl/pkg/util"
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"github.com/miekg/dns"
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"golang.org/x/net/idna"
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"gopkg.in/yaml.v3"
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)
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// PrintSpecial is for printing as JSON, XML or YAML.
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// As of now JSON and XML use the stdlib version.
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func PrintSpecial(msg *dns.Msg, opts util.Options) (string, error) {
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formatted, err := MakePrintable(msg, opts)
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if err != nil {
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return "", err
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}
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switch {
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case opts.JSON:
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opts.Logger.Info("Printing as JSON")
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json, err := json.MarshalIndent(formatted, " ", " ")
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return string(json), err
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case opts.XML:
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opts.Logger.Info("Printing as XML")
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xml, err := xml.MarshalIndent(formatted, " ", " ")
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return string(xml), err
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case opts.YAML:
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opts.Logger.Info("Printing as YAML")
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yaml, err := yaml.Marshal(formatted)
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return string(yaml), err
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default:
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return "", errInvalidFormat
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}
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}
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// MakePrintable takes a DNS message and makes it nicer to be printed as JSON,YAML,
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// and XML. Little is changed beyond naming.
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func MakePrintable(msg *dns.Msg, opts util.Options) (*Message, error) {
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var err error
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// The things I do for compatibility
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ret := Message{
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Header: Header{
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ID: msg.Id,
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Response: msg.Response,
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Opcode: dns.OpcodeToString[msg.Opcode],
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Authoritative: msg.Authoritative,
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Truncated: msg.Truncated,
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RecursionDesired: msg.RecursionDesired,
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RecursionAvailable: msg.RecursionAvailable,
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Zero: msg.Zero,
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AuthenticatedData: msg.AuthenticatedData,
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CheckingDisabled: msg.CheckingDisabled,
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Status: dns.RcodeToString[msg.Rcode],
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},
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}
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for _, question := range msg.Question {
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var name string
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if opts.Display.UcodeTranslate {
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name, err = idna.ToUnicode(question.Name)
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if err != nil {
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return nil, fmt.Errorf("punycode to unicode: %w", err)
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}
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} else {
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name = question.Name
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}
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ret.Question = append(ret.Question, Question{
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Name: name,
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Type: dns.TypeToString[question.Qtype],
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Class: dns.ClassToString[question.Qclass],
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})
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}
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for _, answer := range msg.Answer {
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temp := strings.Split(answer.String(), "\t")
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var (
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ttl string
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name string
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)
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if opts.Display.TTL {
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if opts.Display.HumanTTL {
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ttl = (time.Duration(answer.Header().Ttl) * time.Second).String()
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} else {
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ttl = strconv.Itoa(int(answer.Header().Ttl))
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}
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}
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if opts.Display.UcodeTranslate {
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name, err = idna.ToUnicode(answer.Header().Name)
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if err != nil {
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return nil, fmt.Errorf("punycode to unicode: %w", err)
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}
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} else {
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name = answer.Header().Name
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}
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ret.Answer = append(ret.Answer, Answer{
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RRHeader: RRHeader{
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Name: name,
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Type: dns.TypeToString[answer.Header().Rrtype],
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Class: dns.ClassToString[answer.Header().Class],
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Rdlength: answer.Header().Rdlength,
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TTL: ttl,
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},
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Value: temp[len(temp)-1],
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})
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}
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for _, ns := range msg.Ns {
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temp := strings.Split(ns.String(), "\t")
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var (
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ttl string
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name string
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)
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if opts.Display.TTL {
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if opts.Display.HumanTTL {
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ttl = (time.Duration(ns.Header().Ttl) * time.Second).String()
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} else {
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ttl = strconv.Itoa(int(ns.Header().Ttl))
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}
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}
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if opts.Display.UcodeTranslate {
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name, err = idna.ToUnicode(ns.Header().Name)
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if err != nil {
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return nil, fmt.Errorf("punycode to unicode: %w", err)
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}
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} else {
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name = ns.Header().Name
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}
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ret.Authority = append(ret.Authority, Answer{
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RRHeader: RRHeader{
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Name: name,
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Type: dns.TypeToString[ns.Header().Rrtype],
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Class: dns.ClassToString[ns.Header().Class],
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Rdlength: ns.Header().Rdlength,
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TTL: ttl,
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},
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Value: temp[len(temp)-1],
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})
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}
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for _, additional := range msg.Extra {
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if additional.Header().Rrtype == dns.StringToType["OPT"] {
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continue
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} else {
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temp := strings.Split(additional.String(), "\t")
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var (
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ttl string
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name string
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)
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if opts.Display.TTL {
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if opts.Display.HumanTTL {
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ttl = (time.Duration(additional.Header().Ttl) * time.Second).String()
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} else {
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ttl = strconv.Itoa(int(additional.Header().Ttl))
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}
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}
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if opts.Display.UcodeTranslate {
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name, err = idna.ToUnicode(additional.Header().Name)
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if err != nil {
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return nil, fmt.Errorf("punycode to unicode: %w", err)
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}
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} else {
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name = additional.Header().Name
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}
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ret.Additional = append(ret.Additional, Answer{
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RRHeader: RRHeader{
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Name: name,
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Type: dns.TypeToString[additional.Header().Rrtype],
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Class: dns.ClassToString[additional.Header().Class],
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Rdlength: additional.Header().Rdlength,
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TTL: ttl,
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},
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Value: temp[len(temp)-1],
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})
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}
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}
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opt := msg.IsEdns0()
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if opt != nil && opts.Display.Opt {
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ret.Opt, err = parseOpt(*opt)
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if err != nil {
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return nil, fmt.Errorf("edns print: %w", err)
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}
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}
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return &ret, nil
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}
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func parseOpt(rr dns.OPT) ([]Opts, error) {
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ret := []Opts{}
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// Most of this is taken from https://github.com/miekg/dns/blob/master/edns.go#L76
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ret = append(ret, Opts{
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Name: "Version",
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Value: strconv.Itoa(int(rr.Version())),
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})
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if rr.Do() {
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ret = append(ret, Opts{
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Name: "Flags",
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Value: "do",
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})
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} else {
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ret = append(ret, Opts{
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Name: "Flags",
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Value: "",
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})
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}
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if rr.Hdr.Ttl&0x7FFF != 0 {
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ret = append(ret, Opts{
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Name: "MBZ",
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Value: fmt.Sprintf("0x%04x", rr.Hdr.Ttl&0x7FFF),
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})
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}
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ret = append(ret, Opts{
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Name: "UDP Buffer Size",
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Value: strconv.Itoa(int(rr.UDPSize())),
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})
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for _, opt := range rr.Option {
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switch opt.(type) {
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case *dns.EDNS0_NSID:
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str := opt.String()
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hex, err := hex.DecodeString(str)
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if err != nil {
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return nil, fmt.Errorf("%w", err)
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}
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ret = append(ret, Opts{
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Name: "NSID",
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Value: fmt.Sprintf("%s (%s)", str, string(hex)),
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})
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case *dns.EDNS0_SUBNET:
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ret = append(ret, Opts{
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Name: "Subnet",
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Value: opt.String(),
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})
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case *dns.EDNS0_COOKIE:
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ret = append(ret, Opts{
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Name: "Cookie",
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Value: opt.String(),
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})
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case *dns.EDNS0_EXPIRE:
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ret = append(ret, Opts{
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Name: "Expire",
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Value: opt.String(),
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})
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case *dns.EDNS0_TCP_KEEPALIVE:
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ret = append(ret, Opts{
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Name: "TCP Keepalive",
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Value: opt.String(),
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})
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case *dns.EDNS0_UL:
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ret = append(ret, Opts{
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Name: "Update Lease",
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Value: opt.String(),
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})
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case *dns.EDNS0_LLQ:
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ret = append(ret, Opts{
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Name: "Long Lived Queries",
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Value: opt.String(),
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})
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case *dns.EDNS0_DAU:
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ret = append(ret, Opts{
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Name: "DNSSEC Algorithm Understood",
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Value: opt.String(),
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})
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case *dns.EDNS0_DHU:
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ret = append(ret, Opts{
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Name: "DS Hash Understood",
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Value: opt.String(),
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})
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case *dns.EDNS0_N3U:
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ret = append(ret, Opts{
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Name: "NSEC3 Hash Understood",
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Value: opt.String(),
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})
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case *dns.EDNS0_LOCAL:
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ret = append(ret, Opts{
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Name: "Local OPT",
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Value: opt.String(),
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})
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case *dns.EDNS0_PADDING:
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ret = append(ret, Opts{
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Name: "Padding",
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Value: opt.String(),
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})
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case *dns.EDNS0_EDE:
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ret = append(ret, Opts{
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Name: "EDE",
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Value: opt.String(),
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})
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case *dns.EDNS0_ESU:
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ret = append(ret, Opts{
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Name: "ESU",
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Value: opt.String(),
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})
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}
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}
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return ret, nil
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}
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var errInvalidFormat = errors.New("this should never happen")
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