Failed to create datagram socket (OS Error: Permission denied, errno = 13

Question

我正在使用 flutter 并利用 dart 中的 RawDatagramSocket 来发送 WOL 数据包。我的代码在 IOS 中运行良好，但在 android 模拟器中我不断收到此错误

Unhandled Exception: SocketException: Failed to create datagram socket (OS Error: Permission denied, errno = 13), address = 0.0.0.0, port = 9

我的 android 清单中有这些权限，但我仍然无法让它停止错误：

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

用法示例如下：

class WakeOnLanService {
  Future wake(InternetAddress ipAddress, MacAddress macAddress, int port) {
    return RawDatagramSocket.bind(InternetAddress.anyIPv4, port)
        .then((RawDatagramSocket udpSocket) {
      udpSocket.broadcastEnabled = true;

      List<int> macBytes = macAddress.bytes;
      List<int> packet = new List<int>(17 * 6);
      for (int i = 0; i < 6; i++) packet[i] = 0xFF;
      for (int i = 1; i <= 16; i++)
        for (int j = 0; j < 6; j++) packet[i * 6 + j] = macBytes[j];

      udpSocket.send(packet, ipAddress, port);
      udpSocket.close();
    });
  }
}

Answer 1

要使用临时端口（如 java，如评论中所述）只需将 0 传递给绑定。

    return RawDatagramSocket.bind(InternetAddress.anyIPv4, 0)

没有记录，这是一个问题：https://github.com/dart-lang/sdk/issues/35147

引用：

If port has the value 0 an ephemeral port will be chosen by the system. The actual port used can be retrieved using the port getter.

Failed to create datagram socket (OS Error: Permission denied, errno = 13

Failed to create datagram socket (OS Error: Permission denied, errno = 13

android

ios

flutter

android-manifest

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