Incorrect maximum length of the datagram

[ngolovleva]

According to RawDatagramSocket.receive()

The maximum length of the datagram that can be received is 65503 bytes.

However, the test below demonstrates receiving the datagram of 65507 bytes length.

65507

import "dart:async";
import "dart:io";

int sentLength = 65507;

main() {
  var address = InternetAddress.LOOPBACK_IP_V4;
  RawDatagramSocket.bind(address, 0).then((producer) {
    RawDatagramSocket.bind(address, 0).then((receiver) {
      Timer timer2;
      List<int> sList = new List<int>(sentLength);
      for (int i = 0; i < sentLength; i++) {
        sList[i] = i & 0xff;
      }

      producer.send(sList, address, receiver.port);
      producer.close();

      List<int> rList;

      receiver.listen((event) {
        var datagram = receiver.receive();
        if (datagram != null) {
          rList = datagram.data;
          print(rList.length);           // received datagram.data length
        }
        if (timer2 != null) timer2.cancel();
        timer2 = new Timer(const Duration(milliseconds: 200), () {
          receiver.close();
        });
      });
    });
  });
}

Reproduced with Dart VM version: 2.0.0-dev.14.0 (Wed Dec 20 10:43:00 2017 +0100) on "linux_x64".

[sgrekhov]

The issue still exists. Dart SDK version: 2.19.0-81.0.dev (dev) (Tue Aug 9 14:51:36 2022 -0700) on "windows_x64"

[rmacnak-google]

@brianquinlan This test flaked recently. RawDatagramSocket.receive should probably remove the maximum length claim, as IPv6 jumbograms might produce much larger datagrams.