public async Task <TransmissionResult> SendAsync(Transmission msg, IPAddress groupIp, int port,
EMulticastInterface iface, IPAddress specificIface = null, int ttl = 1)
{
Validate(groupIp, port);
if (_sendUdpClient == null || _sendUdpClient.Client.AddressFamily != groupIp.AddressFamily)
{
if (_sendUdpClient != null)
{
_sendUdpClient.Close();
}
_sendUdpClient = new UdpClient(groupIp.AddressFamily);
_sendUdpClient.Client.Bind(new IPEndPoint(
_sendUdpClient.Client.AddressFamily == AddressFamily.InterNetworkV6 ?
IPAddress.IPv6Any : IPAddress.Any, 0));
}
SetSendTTL(_sendUdpClient, ttl);
IPEndPoint from = _sendUdpClient.Client.LocalEndPoint as IPEndPoint;
IPEndPoint to = new IPEndPoint(groupIp, port);
var sendInterfaces = new List <int>();
if (iface == EMulticastInterface.All)
{
foreach (var ni in NetworkUtils.GetActiveInterfaces())
{
sendInterfaces.Add(_sendUdpClient.Client.AddressFamily == AddressFamily.InterNetworkV6
? ni.IPv6.Index : ni.IPv4.Index);
}
}
else if (iface == EMulticastInterface.Specific)
{
int idx = NetworkUtils.GetBestMulticastInterfaceIndex(specificIface);
if (idx == -1)
{
idx = 0; // fall back default to default if not found.
}
sendInterfaces.Add(idx);
}
else
{
sendInterfaces.Add(0); // use default interface.
}
foreach (var ifaceIndex in sendInterfaces)
{
SetSendInterface(_sendUdpClient, ifaceIndex);
await _sendUdpClient.SendAsync(msg.Data, msg.Data.Length, to);
}
return(new TransmissionResult {
From = from, To = to
});
}
public void JoinASM(IPAddress groupIp, int port,
EMulticastInterface iface, IPAddress specificIface = null)
{
Validate(groupIp, port);
if (_udpClient != null)
{
return; // already started.
}
_udpClient = new UdpClient(groupIp.AddressFamily);
Socket socket = _udpClient.Client;
socket.SetSocketOption(
SocketOptionLevel.Socket,
SocketOptionName.ReuseAddress,
true
);
var bindInterface = specificIface;
if (iface != EMulticastInterface.Specific)
{
bindInterface = (socket.AddressFamily == AddressFamily.InterNetworkV6 ?
IPAddress.IPv6Any : IPAddress.Any);
}
socket.Bind(new IPEndPoint(bindInterface, port));
var joinInterfaces = new List <int>();
if (iface == EMulticastInterface.All)
{
foreach (var ni in NetworkUtils.GetActiveInterfaces())
{
joinInterfaces.Add(socket.AddressFamily == AddressFamily.InterNetworkV6
? ni.IPv6.Index : ni.IPv4.Index);
}
}
else if (iface == EMulticastInterface.Specific)
{
int best = NetworkUtils.GetBestMulticastInterfaceIndex(specificIface);
if (best == -1)
{
best = 0;
}
joinInterfaces.Add(best);
}
else if (iface == EMulticastInterface.Default)
{
joinInterfaces.Add(0); // 0 = default.
}
foreach (int ifaceIndex in joinInterfaces)
{
if (socket.AddressFamily == AddressFamily.InterNetwork)
{
MulticastOption opt = new MulticastOption(
groupIp, ifaceIndex);
socket.SetSocketOption(SocketOptionLevel.IP,
SocketOptionName.AddMembership, opt);
}
else if (socket.AddressFamily == AddressFamily.InterNetworkV6)
{
IPv6MulticastOption optv6 = new IPv6MulticastOption(
groupIp, ifaceIndex);
socket.SetSocketOption(SocketOptionLevel.IPv6,
SocketOptionName.AddMembership, optv6);
}
}
StatusChanged?.Invoke(this,
new UdpMulticastClientStatusEventArgs(true)
{
MulticastGroup = new IPEndPoint(groupIp, port),
MulticastInterface = iface,
SpecificInterface = specificIface
}
);
StartReceive();
}
public void JoinSSM(IPAddress groupIp, IPAddress sourceIp, int port,
EMulticastInterface iface, IPAddress specificIface = null)
{
Validate(groupIp, port);
if (_udpClient != null)
{
return; // already started.
}
_udpClient = new UdpClient(groupIp.AddressFamily);
Socket socket = _udpClient.Client;
socket.SetSocketOption(
SocketOptionLevel.Socket,
SocketOptionName.ReuseAddress,
true
);
var bindInterface = specificIface;
if (iface != EMulticastInterface.Specific)
{
bindInterface = (socket.AddressFamily == AddressFamily.InterNetworkV6 ?
IPAddress.IPv6Any : IPAddress.Any);
}
socket.Bind(new IPEndPoint(bindInterface, port));
var joinInterfaces = new List <int>();
if (iface == EMulticastInterface.All)
{
foreach (var ni in NetworkUtils.GetActiveInterfaces())
{
joinInterfaces.Add(socket.AddressFamily == AddressFamily.InterNetworkV6
? ni.IPv6.Index : ni.IPv4.Index);
}
}
else if (iface == EMulticastInterface.Specific)
{
int best = NetworkUtils.GetBestMulticastInterfaceIndex(specificIface);
if (best == -1)
{
best = 0;
}
joinInterfaces.Add(best);
}
else if (iface == EMulticastInterface.Default)
{
joinInterfaces.Add(0); // 0 = default.
}
foreach (int ifaceIndex in joinInterfaces)
{
if (socket.AddressFamily == AddressFamily.InterNetwork)
{
var bin = new byte[12];
Buffer.BlockCopy(groupIp.GetAddressBytes(), 0, bin, 0, 4);
Buffer.BlockCopy(sourceIp.GetAddressBytes(), 0, bin, 4, 4);
Buffer.BlockCopy(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(ifaceIndex)), 0, bin, 8, 4);
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddSourceMembership, bin);
}
else if (socket.AddressFamily == AddressFamily.InterNetworkV6)
{
// fill data as in GROUP_SOURCE_REQ struct
var bin = CreateGroupSourceReg(sourceIp, groupIp, ifaceIndex);
socket.SetSocketOption(SocketOptionLevel.IPv6, (SocketOptionName)45, bin);
}
}
StatusChanged?.Invoke(this,
new UdpMulticastClientStatusEventArgs(true)
{
MulticastGroup = new IPEndPoint(groupIp, port),
MulticastInterface = iface,
SpecificInterface = specificIface
}
);
StartReceive();
}
