public void Send(byte[] buffer, int length)
{
// make sure that a default destination IPEndpoint has been configured.
if ((destinationIpAddress == IPv6Any) || (destinationPort == IPPortAny))
{
throw new SocketsException("Socket is not connected.");
}
UdpDatagram udpDatagram = new UdpDatagram();
udpDatagram.DestinationPort = destinationPort;
udpDatagram.SourcePort = sourcePort;
udpDatagram.AddPayload(buffer);
udpDatagram.Checksum = 0;
IPv6Packet packetUDP = new IPv6Packet();
packetUDP.SourceAddress = sourceIpAddress;
packetUDP.DestinationAddress = destinationIpAddress;
packetUDP.NextHeader = IPv6Protocol.Udp;
packetUDP.Payload = udpDatagram;
packetUDP.PayloadLength = udpDatagram.Length;
IPv6PseudoHeader ipv6PseudoHeader = new IPv6PseudoHeader(packetUDP.SourceAddress, packetUDP.DestinationAddress, packetUDP.PayloadLength, (byte)packetUDP.NextHeader);
ushort checkSum = ipv6PseudoHeader.GetCheckSum();
checkSum = NetUtilities.ComputeChecksum(checkSum, udpDatagram.ToBytes(), true);
udpDatagram.Checksum = checkSum;
NetworkingInterface.Send(packetUDP.ToBytes());
}
public static void PacketHandler(IPv6Packet ipv6Packet)
{
Icmpv6Packet icmpv6Handler = (Icmpv6Packet)ipv6Packet.Payload;
if (icmpv6Handler.Icmpv6MessageType == Icmpv6MessageType.EchoRequest)
{
IPv6Packet packetEchoReply = new IPv6Packet();
packetEchoReply.SourceAddress = ipv6Packet.DestinationAddress;
packetEchoReply.DestinationAddress = ipv6Packet.SourceAddress;
packetEchoReply.NextHeader = ipv6Packet.NextHeader;
packetEchoReply.Flow = ipv6Packet.Flow;
packetEchoReply.HopLimit = ipv6Packet.HopLimit;
packetEchoReply.PayloadLength = ipv6Packet.PayloadLength;
packetEchoReply.TrafficClass = ipv6Packet.TrafficClass;
packetEchoReply.Version = ipv6Packet.Version;
icmpv6Handler.Icmpv6MessageType = Icmpv6MessageType.EchoReply;
Icmpv6EchoReply icmpv6EchoReply = new Icmpv6EchoReply((Icmpv6EchoRequest)icmpv6Handler.IcmpMessage);
icmpv6Handler.IcmpMessage = icmpv6EchoReply;
IPv6PseudoHeader ipv6PseudoHeader = new IPv6PseudoHeader(packetEchoReply.SourceAddress, packetEchoReply.DestinationAddress, packetEchoReply.PayloadLength, (byte)packetEchoReply.NextHeader);
ushort checkSum = ipv6PseudoHeader.GetCheckSum();
byte[] icmpData = icmpv6Handler.ToBytes();
icmpData[2] = 0;
icmpData[3] = 0;
checkSum = NetUtilities.ComputeChecksum(checkSum, icmpData, true);
icmpv6Handler.Checksum = checkSum;
packetEchoReply.Payload = icmpv6Handler;
NetworkingInterface.Send(packetEchoReply.ToBytes());
}
else if (icmpv6Handler.Icmpv6MessageType == Icmpv6MessageType.EchoReply)
{
if (isResponseTimeout)
{
return;
}
TimeSpan elapsed = DateTime.Now - pingStart;
replyTime = (short)elapsed.TotalMilliseconds;
pingTimeout.Set();
}
}