551 lines
12 KiB
Go
551 lines
12 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/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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// ToString turns the response into something that looks a lot like dig
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//
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// Much of this is taken from https://github.com/miekg/dns/blob/master/msg.go#L900
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func ToString(res util.Response, opts util.Options) (string, error) {
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if res.DNS == nil {
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return "<nil> MsgHdr", errNoMessage
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}
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var (
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s string
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opt *dns.OPT
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)
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if !opts.Short {
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if opts.Display.Comments {
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s += res.DNS.MsgHdr.String() + " "
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s += "QUERY: " + strconv.Itoa(len(res.DNS.Question)) + ", "
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s += "ANSWER: " + strconv.Itoa(len(res.DNS.Answer)) + ", "
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s += "AUTHORITY: " + strconv.Itoa(len(res.DNS.Ns)) + ", "
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s += "ADDITIONAL: " + strconv.Itoa(len(res.DNS.Extra)) + "\n"
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opt = res.DNS.IsEdns0()
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if opt != nil && opts.Display.Opt {
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// OPT PSEUDOSECTION
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s += opt.String() + "\n"
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}
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}
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if opts.Display.Question {
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if len(res.DNS.Question) > 0 {
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if opts.Display.Comments {
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s += "\n;; QUESTION SECTION:\n"
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}
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for _, r := range res.DNS.Question {
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str, err := stringParse(r.String(), false, opts)
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if err != nil {
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return "", fmt.Errorf("%w", err)
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}
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s += str + "\n"
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}
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}
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}
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if opts.Display.Answer {
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if len(res.DNS.Answer) > 0 {
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if opts.Display.Comments {
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s += "\n;; ANSWER SECTION:\n"
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}
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for _, r := range res.DNS.Answer {
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if r != nil {
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str, err := stringParse(r.String(), true, opts)
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if err != nil {
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return "", fmt.Errorf("%w", err)
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}
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s += str + "\n"
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}
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}
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}
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}
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if opts.Display.Authority {
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if len(res.DNS.Ns) > 0 {
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if opts.Display.Comments {
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s += "\n;; AUTHORITY SECTION:\n"
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}
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for _, r := range res.DNS.Ns {
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if r != nil {
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str, err := stringParse(r.String(), true, opts)
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if err != nil {
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return "", fmt.Errorf("%w", err)
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}
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s += str + "\n"
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}
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}
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}
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}
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if opts.Display.Additional {
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if len(res.DNS.Extra) > 0 && (opt == nil || len(res.DNS.Extra) > 1) {
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if opts.Display.Comments {
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s += "\n;; ADDITIONAL SECTION:\n"
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}
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for _, r := range res.DNS.Extra {
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if r != nil && r.Header().Rrtype != dns.TypeOPT {
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str, err := stringParse(r.String(), true, opts)
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if err != nil {
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return "", fmt.Errorf("%w", err)
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}
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s += str + "\n"
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}
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}
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}
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}
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if opts.Display.Statistics {
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s += "\n;; Query time: " + res.RTT.String()
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s += "\n;; SERVER: " + opts.Request.Server + serverExtra(opts)
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s += "\n;; WHEN: " + time.Now().Format(time.RFC1123Z)
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s += "\n;; MSG SIZE rcvd: " + strconv.Itoa(res.DNS.Len()) + "\n"
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}
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} else {
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// Print just the responses, nothing else
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for i, resp := range res.DNS.Answer {
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temp := strings.Split(resp.String(), "\t")
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s += temp[len(temp)-1]
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if opts.Identify {
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s += " from server " + opts.Request.Server + " in " + res.RTT.String()
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}
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// Don't print newline on last line
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if i != len(res.DNS.Answer)-1 {
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s += "\n"
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}
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}
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}
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return s, nil
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}
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func serverExtra(opts util.Options) string {
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// Add extra information to server string
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var extra string
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switch {
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case opts.TCP:
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extra = ":" + strconv.Itoa(opts.Request.Port) + " (TCP)"
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case opts.TLS:
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extra = ":" + strconv.Itoa(opts.Request.Port) + " (TLS)"
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case opts.HTTPS, opts.DNSCrypt:
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extra = ""
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case opts.QUIC:
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extra = ":" + strconv.Itoa(opts.Request.Port) + " (QUIC)"
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default:
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extra = ":" + strconv.Itoa(opts.Request.Port) + " (UDP)"
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}
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return extra
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}
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// stringParse edits the raw responses to user requests.
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func stringParse(str string, isAns bool, opts util.Options) (string, error) {
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split := strings.Split(str, "\t")
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// Make edits if so requested
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// TODO: make less ew?
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// This exists because the question section should be left alone EXCEPT for punycode.
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if isAns {
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if !opts.Display.TTL {
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// Remove from existence
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split = append(split[:1], split[2:]...)
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}
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if !opts.Display.ShowClass {
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// Position depends on if the TTL is there or not.
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if opts.Display.TTL {
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split = append(split[:2], split[3:]...)
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} else {
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split = append(split[:1], split[2:]...)
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}
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}
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if opts.Display.TTL && opts.Display.HumanTTL {
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ttl, _ := strconv.Atoi(split[1])
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split[1] = (time.Duration(ttl) * time.Second).String()
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}
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}
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if opts.Display.UcodeTranslate {
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var (
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err error
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semi string
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)
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if strings.HasPrefix(split[0], ";") {
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split[0] = strings.TrimPrefix(split[0], ";")
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semi = ";"
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}
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split[0], err = idna.ToUnicode(split[0])
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if err != nil {
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return "", fmt.Errorf("punycode: %w", err)
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}
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split[0] = semi + split[0]
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}
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return strings.Join(split, "\t"), nil
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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(res util.Response, opts util.Options) (string, error) {
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formatted, err := MakePrintable(res, 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(res util.Response, opts util.Options) (*Message, error) {
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var (
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err error
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msg = res.DNS
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)
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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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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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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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if opts.Display.Statistics {
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ret.Statistics = Statistics{
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RTT: res.RTT.String(),
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Server: opts.Request.Server + serverExtra(opts),
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When: time.Now().Format(time.RFC1123Z),
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MsgSize: res.DNS.Len(),
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}
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} else {
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ret.Statistics = Statistics{}
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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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