internal UdpOutputChannel(UdpChannelFactory factory, EndpointAddress remoteAddress, Uri via, MessageEncoder encoder)
: base(factory)
{
// validate addressing arguments
if (!string.Equals(via.Scheme, UdpConstants.Scheme, StringComparison.InvariantCultureIgnoreCase))
{
throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
"The scheme {0} specified in address is not supported.", via.Scheme), "via");
}
if (via.IsDefaultPort)
{
throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
"The address {0} must specify a remote port.", via), "via");
}
// convert the Uri host into an IP Address
IPAddress remoteIP = null;
switch (via.HostNameType)
{
default:
throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
"Cannot determine the remote host address from {0}.",
this.via.ToString()), "via");
case UriHostNameType.IPv4:
case UriHostNameType.IPv6:
remoteIP = IPAddress.Parse(via.Host);
break;
case UriHostNameType.Basic:
case UriHostNameType.Dns:
{
IPHostEntry hostEntry = Dns.GetHostEntry(via.Host);
if (hostEntry.AddressList.Length > 0)
{
remoteIP = hostEntry.AddressList[0];
}
else
{
throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
"Failed to resolve remote host: {0}.", via.Host),
"via");
}
break;
}
}
if (factory.Multicast && !UdpChannelHelpers.IsInMulticastRange(remoteIP))
{
throw new ArgumentOutOfRangeException("remoteEndPoint", "Via must be in the valid multicast range.");
}
this.parent = factory;
this.remoteAddress = remoteAddress;
this.via = via;
this.encoder = encoder;
this.remoteEndPoint = new IPEndPoint(remoteIP, via.Port);
this.socket = new Socket(this.remoteEndPoint.AddressFamily, SocketType.Dgram, ProtocolType.Udp);
this.socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1);
if (parent.SendPort != 0)
{
this.socket.Bind(new IPEndPoint(IPAddress.Any, parent.SendPort));
}
//if (parent.Multicast)
//{
//this.socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1);
//this.socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(remoteIP));
//socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 50);//貌似不需要这么设置，自动支持组播
#if LATER // Support outgoing interface
if (this.remoteEndPoint.AddressFamily == AddressFamily.InterNetwork)
{
this.socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, IPAddress.HostToNetworkOrder((int)interfaceIndex));
}
else // we are IPv6
{
this.sendSocketV6.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.MulticastInterface, (int)interfaceIndex);
}
#endif
//}
}
