314 lines
7.0 KiB
Go
314 lines
7.0 KiB
Go
// SPDX-License-Identifier: BSD-3-Clause
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package query
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import (
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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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"dns.froth.zone/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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// 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) (s string, err 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 opt *dns.OPT
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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
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}
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func serverExtra(opts *util.Options) string {
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switch {
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case opts.TCP:
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return " (TCP)"
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case opts.TLS:
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return " (TLS)"
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case opts.HTTPS, opts.DNSCrypt:
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return ""
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case opts.QUIC:
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return " (QUIC)"
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default:
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return " (UDP)"
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}
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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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DateString: time.Now().Format(time.RFC3339),
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DateSeconds: time.Now().Unix(),
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MsgSize: res.DNS.Len(),
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ID: msg.Id,
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Opcode: msg.Opcode,
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Response: msg.Response,
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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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AuthenticatedData: msg.AuthenticatedData,
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CheckingDisabled: msg.CheckingDisabled,
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Zero: msg.Zero,
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QdCount: len(msg.Question),
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AnCount: len(msg.Answer),
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NsCount: len(msg.Ns),
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ArCount: len(msg.Extra),
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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.EDNS0, err = ret.ParseOpt(msg.Rcode, *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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if opts.Display.Question {
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err = ret.displayQuestion(msg, opts, opt)
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if err != nil {
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return nil, fmt.Errorf("unable to display questions: %w", err)
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}
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}
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if opts.Display.Answer {
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err = ret.displayAnswers(msg, opts, opt)
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if err != nil {
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return nil, fmt.Errorf("unable to display answers: %w", err)
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}
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}
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if opts.Display.Authority {
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err = ret.displayAuthority(msg, opts, opt)
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if err != nil {
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return nil, fmt.Errorf("unable to display authority: %w", err)
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}
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}
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if opts.Display.Additional {
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err = ret.displayAdditional(msg, opts, opt)
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if err != nil {
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return nil, fmt.Errorf("unable to display additional: %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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var errInvalidFormat = errors.New("this should never happen")
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