AdGuardHome/coredns_plugin/querylog.go

152 lines
4.0 KiB
Go

package dnsfilter
import (
"encoding/json"
"fmt"
"log"
"net/http"
"runtime"
"strconv"
"strings"
"time"
"github.com/AdguardTeam/AdguardDNS/dnsfilter"
"github.com/coredns/coredns/plugin/pkg/response"
"github.com/miekg/dns"
"github.com/zfjagann/golang-ring"
)
var logBuffer = ring.Ring{}
type logEntry struct {
Question *dns.Msg
Answer *dns.Msg
Result dnsfilter.Result
Time time.Time
Elapsed time.Duration
IP string
}
func init() {
logBuffer.SetCapacity(1000)
}
func logRequest(question *dns.Msg, answer *dns.Msg, result dnsfilter.Result, elapsed time.Duration, ip string) {
entry := logEntry{
Question: question,
Answer: answer,
Result: result,
Time: time.Now(),
Elapsed: elapsed,
IP: ip,
}
logBuffer.Enqueue(entry)
}
func handler(w http.ResponseWriter, r *http.Request) {
values := logBuffer.Values()
var data = []map[string]interface{}{}
for _, value := range values {
entry, ok := value.(logEntry)
if !ok {
continue
}
jsonentry := map[string]interface{}{
"reason": entry.Result.Reason.String(),
"elapsed_ms": strconv.FormatFloat(entry.Elapsed.Seconds()*1000, 'f', -1, 64),
"time": entry.Time.Format(time.RFC3339),
"client": entry.IP,
}
question := map[string]interface{}{
"host": strings.ToLower(strings.TrimSuffix(entry.Question.Question[0].Name, ".")),
"type": dns.Type(entry.Question.Question[0].Qtype).String(),
"class": dns.Class(entry.Question.Question[0].Qclass).String(),
}
jsonentry["question"] = question
status, _ := response.Typify(entry.Answer, time.Now().UTC())
jsonentry["status"] = status.String()
if len(entry.Result.Rule) > 0 {
jsonentry["rule"] = entry.Result.Rule
}
if entry.Answer != nil && len(entry.Answer.Answer) > 0 {
var answers = []map[string]interface{}{}
for _, k := range entry.Answer.Answer {
header := k.Header()
answer := map[string]interface{}{
"type": dns.TypeToString[header.Rrtype],
"ttl": header.Ttl,
}
// try most common record types
switch v := k.(type) {
case *dns.A:
answer["value"] = v.A
case *dns.AAAA:
answer["value"] = v.AAAA
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"] = v.Txt
case *dns.TXT:
answer["value"] = v.Txt
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:
// type unknown, marshall it as-is
answer["value"] = v
}
answers = append(answers, answer)
}
jsonentry["answer"] = answers
}
data = append(data, jsonentry)
}
json, err := json.Marshal(data)
if err != nil {
errortext := fmt.Sprintf("Couldn't marshal data into json: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(json)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
}
}
func startQueryLogServer() {
listenAddr := "127.0.0.1:8618" // sha512sum of "querylog" then each byte summed
http.HandleFunc("/querylog", handler)
if err := http.ListenAndServe(listenAddr, nil); err != nil {
log.Fatalf("error in ListenAndServe: %s", err)
}
}
func trace(text string) {
pc := make([]uintptr, 10) // at least 1 entry needed
runtime.Callers(2, pc)
f := runtime.FuncForPC(pc[0])
log.Printf("%s(): %s\n", f.Name(), text)
}