replace deprecated method

listener/dns/listener.go

@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/base64"
 	"errors"
-	"io/ioutil"
+	"io"
 	"net"
 	"net/http"
 	"strings"
@@ -164,7 +164,7 @@ func (l *dnsListener) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 
-		buf, err = ioutil.ReadAll(r.Body)
+		buf, err = io.ReadAll(r.Body)
 		if err != nil {
 			l.logger.Error(err)
 			http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)

listener/ssh/metadata.go

@@ -1,7 +1,7 @@
 package ssh
 
 import (
-	"io/ioutil"
+	"os"
 
 	mdata "github.com/go-gost/core/metadata"
 	mdutil "github.com/go-gost/core/metadata/util"
@@ -28,7 +28,7 @@ func (l *sshListener) parseMetadata(md mdata.Metadata) (err error) {
 	)
 
 	if key := mdutil.GetString(md, privateKeyFile); key != "" {
-		data, err := ioutil.ReadFile(key)
+		data, err := os.ReadFile(key)
 		if err != nil {
 			return err
 		}

listener/sshd/metadata.go

@@ -1,7 +1,7 @@
 package ssh
 
 import (
-	"io/ioutil"
+	"os"
 
 	mdata "github.com/go-gost/core/metadata"
 	mdutil "github.com/go-gost/core/metadata/util"
@@ -28,7 +28,7 @@ func (l *sshdListener) parseMetadata(md mdata.Metadata) (err error) {
 	)
 
 	if key := mdutil.GetString(md, privateKeyFile); key != "" {
-		data, err := ioutil.ReadFile(key)
+		data, err := os.ReadFile(key)
 		if err != nil {
 			return err
 		}