如何检查TCP连接是否关闭，占IPV6？

Question

我已经使用 this code 检查 TCP 连接是否关闭。但是，在使用此代码时，我注意到如果连接使用 IPV4，它不适用于 IPV6 地址：

        if (!socket.Connected) return false;

        var ipProperties = IPGlobalProperties.GetIPGlobalProperties();
        var tcpConnections = ipProperties.GetActiveTcpConnections()
            .Where(x => x.LocalEndPoint.Equals(socket.LocalEndPoint) && x.RemoteEndPoint.Equals(socket.RemoteEndPoint));

        var isConnected = false;

        if (tcpConnections != null && tcpConnections.Any())
        {
            TcpState stateOfConnection = tcpConnections.First().State;
            if (stateOfConnection == TcpState.Established)
            {
                isConnected = true;
            }
        }

        return isConnected;

在调试链接答案中的代码时，我注意到 returns 一个包含以下端点的列表：

{127.0.0.1:50503}

但是我正在测试的套接字似乎是 IPV6：

{[::ffff:127.0.0.1]:50503}

{127.0.0.1:50503} == {[::ffff:127.0.0.1]:50503} returns false，所以检查失败。

如何测试 IPV4 地址和 IPV6 地址是否指向同一主机？

Answer 1

我最终创建了一个检查，如果另一端是 IPV6，它会将端点“提升”到 IPV6：

public static bool IsConnectionEstablished(this Socket socket)
{
    if (socket is null)
    {
        throw new ArgumentNullException(nameof(socket));
    }

    if (!socket.Connected) return false;

    var ipProperties = IPGlobalProperties.GetIPGlobalProperties();
    var tcpConnections = ipProperties.GetActiveTcpConnections()
        .Where(x => x.LocalEndPoint is IPEndPoint && x.RemoteEndPoint is IPEndPoint && x.LocalEndPoint != null && x.RemoteEndPoint != null)
        .Where(x => AreEndpointsEqual(x.LocalEndPoint, (IPEndPoint)socket.LocalEndPoint!) && AreEndpointsEqual(x.RemoteEndPoint, (IPEndPoint)socket.RemoteEndPoint!));

    var isConnected = false;

    if (tcpConnections != null && tcpConnections.Any())
    {
        TcpState stateOfConnection = tcpConnections.First().State;
        if (stateOfConnection == TcpState.Established)
        {
            isConnected = true;
        }
    }

    return isConnected;
}

public static bool AreEndpointsEqual(IPEndPoint left, IPEndPoint right)
{
    if (left.AddressFamily == AddressFamily.InterNetwork &&
        right.AddressFamily == AddressFamily.InterNetworkV6)
    {
        left = new IPEndPoint(left.Address.MapToIPv6(), left.Port);
    }

    if (left.AddressFamily == AddressFamily.InterNetworkV6 &&
        right.AddressFamily == AddressFamily.InterNetwork)
    {
        right = new IPEndPoint(right.Address.MapToIPv6(), right.Port);
    }

    return left.Equals(right);
}

如何检查TCP连接是否关闭，占IPV6？

How to check if a TCP connection is closed, accounting for IPV6?

.net

c#

networking