fix: resolve golangci-lint warnings

Добавлена проверка ошибки listener.SetDeadline в tcputil.
Удален вызов устаревшего метода SetStreamMode в KCP.
Добавлено явное игнорирование возвращаемых значений SetDeadline и io.Copy .

client/main.go

@@ -1760,8 +1760,8 @@ func (r *relayPacketConn) SetWriteDeadline(t time.Time) error { return r.relay.S
 func pipe(ctx context.Context, c1, c2 net.Conn) {
 	ctx2, cancel := context.WithCancel(ctx)
 	context.AfterFunc(ctx2, func() {
-		c1.SetDeadline(time.Now())
-		c2.SetDeadline(time.Now())
+		_ = c1.SetDeadline(time.Now())
+		_ = c2.SetDeadline(time.Now())
 	})
 
 	var wg sync.WaitGroup
@@ -1769,14 +1769,14 @@ func pipe(ctx context.Context, c1, c2 net.Conn) {
 	go func() {
 		defer wg.Done()
 		defer cancel()
-		io.Copy(c1, c2)
+		_, _ = io.Copy(c1, c2)
 	}()
 	go func() {
 		defer wg.Done()
 		defer cancel()
-		io.Copy(c2, c1)
+		_, _ = io.Copy(c2, c1)
 	}()
 	wg.Wait()
-	c1.SetDeadline(time.Time{})
-	c2.SetDeadline(time.Time{})
+	_ = c1.SetDeadline(time.Time{})
+	_ = c2.SetDeadline(time.Time{})
 }

server/main.go

@@ -270,8 +270,8 @@ func handleTCPConnection(ctx context.Context, dtlsConn net.Conn, connectAddr str
 func pipeConn(ctx context.Context, c1, c2 net.Conn) {
 	ctx2, cancel := context.WithCancel(ctx)
 	context.AfterFunc(ctx2, func() {
-		c1.SetDeadline(time.Now())
-		c2.SetDeadline(time.Now())
+		_ = c1.SetDeadline(time.Now())
+		_ = c2.SetDeadline(time.Now())
 	})
 
 	var wg sync.WaitGroup
@@ -279,14 +279,14 @@ func pipeConn(ctx context.Context, c1, c2 net.Conn) {
 	go func() {
 		defer wg.Done()
 		defer cancel()
-		io.Copy(c1, c2)
+		_, _ = io.Copy(c1, c2)
 	}()
 	go func() {
 		defer wg.Done()
 		defer cancel()
-		io.Copy(c2, c1)
+		_, _ = io.Copy(c2, c1)
 	}()
 	wg.Wait()
-	c1.SetDeadline(time.Time{})
-	c2.SetDeadline(time.Time{})
+	_ = c1.SetDeadline(time.Time{})
+	_ = c2.SetDeadline(time.Time{})
 }

tcputil/tcputil.go

@@ -63,7 +63,9 @@ func NewKCPOverDTLS(dtlsConn net.Conn, isServer bool) (*kcp.UDPSession, error) {
 		if err != nil {
 			return nil, err
 		}
-		listener.SetDeadline(time.Now().Add(30 * time.Second))
+		if err = listener.SetDeadline(time.Now().Add(30 * time.Second)); err != nil {
+			return nil, err
+		}
 		sess, err = listener.AcceptKCP()
 		if err != nil {
 			return nil, err
@@ -83,7 +85,6 @@ func NewKCPOverDTLS(dtlsConn net.Conn, isServer bool) (*kcp.UDPSession, error) {
 	sess.SetWindowSize(256, 256)
 	sess.SetMtu(1200) // conservative MTU to fit inside DTLS+TURN
 	sess.SetACKNoDelay(true)
-	sess.SetStreamMode(true)
 
 	return sess, nil
 }