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json.go
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json.go
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package querylog
import (
"fmt"
"net"
"strconv"
"strings"
"time"
"github.com/AdguardTeam/AdGuardHome/internal/filtering"
"github.com/AdguardTeam/golibs/log"
"github.com/miekg/dns"
"golang.org/x/net/idna"
)
// TODO(a.garipov): Use a proper structured approach here.
// Get Client IP address
func (l *queryLog) getClientIP(ip net.IP) (clientIP net.IP) {
if l.conf.AnonymizeClientIP && ip != nil {
const AnonymizeClientIPv4Mask = 16
const AnonymizeClientIPv6Mask = 112
if ip.To4() != nil {
return ip.Mask(net.CIDRMask(AnonymizeClientIPv4Mask, 32))
}
return ip.Mask(net.CIDRMask(AnonymizeClientIPv6Mask, 128))
}
return ip
}
// jobject is a JSON object alias.
type jobject = map[string]interface{}
// entriesToJSON converts query log entries to JSON.
func (l *queryLog) entriesToJSON(entries []*logEntry, oldest time.Time) (res jobject) {
data := []jobject{}
// the elements order is already reversed (from newer to older)
for i := 0; i < len(entries); i++ {
entry := entries[i]
jsonEntry := l.logEntryToJSONEntry(entry)
data = append(data, jsonEntry)
}
res = jobject{
"data": data,
"oldest": "",
}
if !oldest.IsZero() {
res["oldest"] = oldest.Format(time.RFC3339Nano)
}
return res
}
func (l *queryLog) logEntryToJSONEntry(entry *logEntry) (jsonEntry jobject) {
var msg *dns.Msg
if len(entry.Answer) > 0 {
msg = new(dns.Msg)
if err := msg.Unpack(entry.Answer); err != nil {
log.Debug("Failed to unpack dns message answer: %s: %s", err, string(entry.Answer))
msg = nil
}
}
hostname := entry.QHost
question := jobject{
"type": entry.QType,
"class": entry.QClass,
"name": hostname,
}
if qhost, err := idna.ToUnicode(hostname); err == nil {
if qhost != hostname && qhost != "" {
question["unicode_name"] = qhost
}
} else {
log.Debug("translating %q into unicode: %s", hostname, err)
}
jsonEntry = jobject{
"reason": entry.Result.Reason.String(),
"elapsedMs": strconv.FormatFloat(entry.Elapsed.Seconds()*1000, 'f', -1, 64),
"time": entry.Time.Format(time.RFC3339Nano),
"client": l.getClientIP(entry.IP),
"client_info": entry.client,
"client_proto": entry.ClientProto,
"upstream": entry.Upstream,
"question": question,
}
if entry.ClientID != "" {
jsonEntry["client_id"] = entry.ClientID
}
if msg != nil {
jsonEntry["status"] = dns.RcodeToString[msg.Rcode]
opt := msg.IsEdns0()
dnssecOk := false
if opt != nil {
dnssecOk = opt.Do()
}
jsonEntry["answer_dnssec"] = dnssecOk
}
jsonEntry["rules"] = resultRulesToJSONRules(entry.Result.Rules)
if len(entry.Result.Rules) > 0 && len(entry.Result.Rules[0].Text) > 0 {
jsonEntry["rule"] = entry.Result.Rules[0].Text
jsonEntry["filterId"] = entry.Result.Rules[0].FilterListID
}
if len(entry.Result.ServiceName) != 0 {
jsonEntry["service_name"] = entry.Result.ServiceName
}
answers := answerToMap(msg)
if answers != nil {
jsonEntry["answer"] = answers
}
if len(entry.OrigAnswer) != 0 {
a := new(dns.Msg)
err := a.Unpack(entry.OrigAnswer)
if err == nil {
answers = answerToMap(a)
if answers != nil {
jsonEntry["original_answer"] = answers
}
} else {
log.Debug("Querylog: msg.Unpack(entry.OrigAnswer): %s: %s", err, string(entry.OrigAnswer))
}
}
return jsonEntry
}
func resultRulesToJSONRules(rules []*filtering.ResultRule) (jsonRules []jobject) {
jsonRules = make([]jobject, len(rules))
for i, r := range rules {
jsonRules[i] = jobject{
"filter_list_id": r.FilterListID,
"text": r.Text,
}
}
return jsonRules
}
type dnsAnswer struct {
Type string `json:"type"`
Value string `json:"value"`
TTL uint32 `json:"ttl"`
}
func answerToMap(a *dns.Msg) (answers []*dnsAnswer) {
if a == nil || len(a.Answer) == 0 {
return nil
}
answers = make([]*dnsAnswer, 0, len(a.Answer))
for _, k := range a.Answer {
header := k.Header()
answer := &dnsAnswer{
Type: dns.TypeToString[header.Rrtype],
TTL: header.Ttl,
}
// Some special treatment for some well-known types.
//
// TODO(a.garipov): Consider just calling String() for everyone
// instead.
switch v := k.(type) {
case nil:
// Probably unlikely, but go on.
case *dns.A:
answer.Value = v.A.String()
case *dns.AAAA:
answer.Value = v.AAAA.String()
case *dns.MX:
answer.Value = fmt.Sprintf("%v %v", v.Preference, v.Mx)
case *dns.CNAME:
answer.Value = v.Target
case *dns.NS:
answer.Value = v.Ns
case *dns.SPF:
answer.Value = strings.Join(v.Txt, "\n")
case *dns.TXT:
answer.Value = strings.Join(v.Txt, "\n")
case *dns.PTR:
answer.Value = v.Ptr
case *dns.SOA:
answer.Value = fmt.Sprintf("%v %v %v %v %v %v %v", v.Ns, v.Mbox, v.Serial, v.Refresh, v.Retry, v.Expire, v.Minttl)
case *dns.CAA:
answer.Value = fmt.Sprintf("%v %v \"%v\"", v.Flag, v.Tag, v.Value)
case *dns.HINFO:
answer.Value = fmt.Sprintf("\"%v\" \"%v\"", v.Cpu, v.Os)
case *dns.RRSIG:
answer.Value = fmt.Sprintf("%v %v %v %v %v %v %v %v %v", dns.TypeToString[v.TypeCovered], v.Algorithm, v.Labels, v.OrigTtl, v.Expiration, v.Inception, v.KeyTag, v.SignerName, v.Signature)
default:
answer.Value = v.String()
}
answers = append(answers, answer)
}
return answers
}