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main.go
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main.go
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package main
import (
"database/sql"
"encoding/json"
"fmt"
"log"
"net"
"strings"
"net/http"
"strconv"
_ "github.com/mattn/go-sqlite3"
"github.com/miekg/dns"
)
// DNSRecord represents a DNS record in the SQLite database
type DNSRecord struct {
ID int `json:"id"`
Name string `json:"name"`
Type string `json:"type"`
Value string `json:"value"`
}
var db *sql.DB
func initDatabase() {
var err error
db, err = sql.Open("sqlite3", "./dns.db")
if err != nil {
log.Fatal(err)
}
_, err = db.Exec(`
CREATE TABLE IF NOT EXISTS records (
id INTEGER PRIMARY KEY AUTOINCREMENT,
name TEXT NOT NULL,
type TEXT NOT NULL,
value TEXT NOT NULL
)
`)
if err != nil {
log.Fatal(err)
}
}
func addDNSRecord(name, recordType, value string) (int64, error) {
result, err := db.Exec("INSERT INTO records (name, type, value) VALUES (?, ?, ?)", name, recordType, value)
if err != nil {
return 0, err
}
id, _ := result.LastInsertId()
fmt.Printf("record created: %s", name)
return id, nil
}
func updateDNSRecord(id int, record DNSRecord) error {
_, err := db.Exec("UPDATE records SET name=?, type=?, value=? WHERE id=?", record.Name, record.Type, record.Value, id)
fmt.Sprintf("updated record: %d", id)
return err
}
func deleteDNSRecord(id int) error {
_, err := db.Exec("DELETE FROM records WHERE id=?", id)
fmt.Sprintf("deleted record: %d", id)
return err
}
func queryDNS(name, recordType string) ([]DNSRecord, error) {
rows, err := db.Query("SELECT * FROM records WHERE name=? AND type=?", name, recordType)
if err != nil {
return nil, err
}
defer rows.Close()
var records []DNSRecord
for rows.Next() {
var record DNSRecord
err := rows.Scan(&record.ID, &record.Name, &record.Type, &record.Value)
if err != nil {
return nil, err
}
fmt.Printf("record read: %s", record.Name)
records = append(records, record)
}
return records, nil
}
/*
func handleDNSRequest(w dns.ResponseWriter, r *dns.Msg) {
msg := dns.Msg{}
msg.SetReply(r)
msg.Authoritative = true
for _, q := range r.Question {
records, err := queryDNS(q.Name, dns.TypeToString[q.Qtype])
if err != nil {
log.Printf("Error querying DNS records: %v", err)
continue
}
for _, record := range records {
rr := new(dns.TXT)
rr.Hdr = dns.RR_Header{Name: q.Name, Rrtype: dns.StringToType[record.Type], Class: dns.ClassINET, Ttl: 3600}
rr.Txt = []string{record.Value}
msg.Answer = append(msg.Answer, rr)
}
}
w.WriteMsg(&msg)
}
*/
func handleDNSRequest(w dns.ResponseWriter, r *dns.Msg) {
fmt.Println("Processing DNS request")
msg := dns.Msg{}
msg.SetReply(r)
msg.Authoritative = true
for _, q := range r.Question {
// Remove trailing dot, if present, from the domain name
domainName := strings.TrimRight(q.Name, ".")
fmt.Printf("Query: %s %s\n", domainName, dns.TypeToString[q.Qtype])
records, err := queryDNS(domainName, dns.TypeToString[q.Qtype])
if err != nil {
log.Printf("Error querying DNS records: %v", err)
continue
}
for _, record := range records {
fmt.Printf("Record: %s %s %s\n", record.Name, record.Type, record.Value)
switch q.Qtype {
case dns.TypeA:
rr := &dns.A{
Hdr: dns.RR_Header{Name: q.Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 3600},
A: net.ParseIP(record.Value),
}
msg.Answer = append(msg.Answer, rr)
fmt.Printf("A record added: %s\n", domainName)
case dns.TypeTXT:
rr := &dns.TXT{
Hdr: dns.RR_Header{Name: q.Name, Rrtype: dns.TypeTXT, Class: dns.ClassINET, Ttl: 3600},
Txt: []string{record.Value},
}
msg.Answer = append(msg.Answer, rr)
fmt.Printf("TXT record added: %s\n", domainName)
// Add more cases for other record types as needed
}
}
}
fmt.Println("Sending DNS response")
if err := w.WriteMsg(&msg); err != nil {
log.Printf("Error sending DNS response: %v", err)
}
}
func handleAPIRequest(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case http.MethodPost:
var record DNSRecord
err := json.NewDecoder(r.Body).Decode(&record)
if err != nil {
http.Error(w, fmt.Sprintf("Error decoding JSON: %v", err), http.StatusBadRequest)
return
}
id, err := addDNSRecord(record.Name, record.Type, record.Value)
if err != nil {
http.Error(w, fmt.Sprintf("Error adding DNS record: %v", err), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusCreated)
json.NewEncoder(w).Encode(map[string]int64{"id": id})
case http.MethodGet:
name := r.URL.Query().Get("name")
recordType := r.URL.Query().Get("type")
records, err := queryDNS(name, recordType)
if err != nil {
http.Error(w, fmt.Sprintf("Error querying DNS records: %v", err), http.StatusInternalServerError)
return
}
json.NewEncoder(w).Encode(records)
case http.MethodPut:
var record DNSRecord
err := json.NewDecoder(r.Body).Decode(&record)
if err != nil {
http.Error(w, fmt.Sprintf("Error decoding JSON: %v", err), http.StatusBadRequest)
return
}
id, err := strconv.Atoi(r.URL.Query().Get("id"))
if err != nil {
http.Error(w, "Invalid ID", http.StatusBadRequest)
return
}
err = updateDNSRecord(id, record)
if err != nil {
http.Error(w, fmt.Sprintf("Error updating DNS record: %v", err), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusOK)
case http.MethodDelete:
id, err := strconv.Atoi(r.URL.Query().Get("id"))
if err != nil {
http.Error(w, "Invalid ID", http.StatusBadRequest)
return
}
err = deleteDNSRecord(id)
if err != nil {
http.Error(w, fmt.Sprintf("Error deleting DNS record: %v", err), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusOK)
default:
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
}
}
func main() {
initDatabase()
dns.HandleFunc(".", handleDNSRequest)
server := &dns.Server{Addr: ":5300", Net: "udp", Handler: dns.DefaultServeMux}
go func() {
http.HandleFunc("/api/records", handleAPIRequest)
log.Fatal(http.ListenAndServe(":8080", nil))
}()
log.Fatal(server.ListenAndServe())
}