在我所有的ip上发送一个UDP组播包

本文关键字：一个 UDP ip | 更新日期: 2023-09-27 18:02:39

我正在尝试在所有网络接口(2个LAN，一个wifi)上发送多播数据包。

我遇到的问题是，这个数据包似乎只有我的一个IP地址。

这是我当前的代码。

private static void SendOnAllCards(int port, String address)
{
    using (Socket mSendSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
    {
        mSendSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership,
                                    new MulticastOption(IPAddress.Parse(address)));
        mSendSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 255);
        mSendSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
        mSendSocket.Bind(new IPEndPoint(IPAddress.Any, port));
        IPEndPoint ipep = new IPEndPoint(IPAddress.Parse(address), port);
        mSendSocket.Connect(ipep);

        byte[] bytes = Encoding.ASCII.GetBytes("This is my welcome message");
        mSendSocket.Send(bytes, bytes.Length, SocketFlags.None);
    }
}

我尝试手动执行:

private static void SendOnAllCards(int port, string remoteAddressSrc)
{
    foreach (IPAddress remoteAddress in Dns.GetHostAddresses(Dns.GetHostName()).Where(i=>i.AddressFamily == AddressFamily.InterNetwork))
    {
        using (Socket mSendSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
        {
            mSendSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership,
                                        new MulticastOption(IPAddress.Parse(remoteAddressSrc)));
            mSendSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 255);
            mSendSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
            mSendSocket.Bind(new IPEndPoint(IPAddress.Any, port));
            IPEndPoint ipep = new IPEndPoint(remoteAddress, port);
            mSendSocket.Connect(ipep);

            byte[] bytes = Encoding.ASCII.GetBytes("This is my welcome message");
            mSendSocket.Send(bytes, bytes.Length, SocketFlags.None);
        }
    }
}

这是可行的，但它意味着我必须创建尽可能多的套接字，我有IP(在这个例子中，我创建每个发送，但这只是一个测试)，我不喜欢我必须获得我所有的IP的方式。

那么正确的方法是什么呢?

编辑第二个附加问题:为什么当我在Connect中指定本地ip时，它指定远程地址，但在Bind上不起作用?

在我所有的ip上发送一个UDP组播包

似乎我们必须在网络接口上进行迭代，在本地IP上进行绑定并执行Send* to *调用:

public void SendTestMessage()
{
    foreach (IPAddress localIp in
        Dns.GetHostAddresses(Dns.GetHostName()).Where(i => i.AddressFamily == AddressFamily.InterNetwork))
    {
        IPAddress ipToUse = localIp;
        using (var mSendSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
        {
            mSendSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership,
                                        new MulticastOption(_multicastIp, localIp));
            mSendSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 255);
            mSendSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
            mSendSocket.MulticastLoopback = true;
            mSendSocket.Bind(new IPEndPoint(ipToUse, _port));

            byte[] bytes = Encoding.ASCII.GetBytes("This is my welcome message");
            var ipep = new IPEndPoint(_multicastIp, _port);
            mSendSocket.SendTo(bytes, ipep);
        }
    }
}

您可以使用WMI类Win32_NetworkAdapter找到网络适配器。您可能需要改进查询实例所带来的结果，因为windows和第三方软件都创建了许多"虚拟适配器"。我编写了一个快速的豪华脚本，使用WMI检索适配器。这应该只显示具有IP地址的适配器。这只是为了显示您可以查询以检索激活适配器的WMI信息。

$networkadapters = @(Get-CimInstance -ClassName Win32_NetworkAdapter -Property *)
$networkadapters_configs = @($networkadapters | Get-CimAssociatedInstance -ResultClassName Win32_NetworkAdapterConfiguration)
0..($networkadapters.Length-1) | %{
    if($networkadapters_configs[$_].IPAddress -gt '') {
        Write-Output "Adapter #$($_)" 
        Write-Output $networkadapters[$_]
        Write-Output "Config #$($_)" 
        Write-Output $networkadapters_configs[$_]
    }
}
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