Beispiel #1
0
        /// <summary>
        /// Simple constructor for the UDP header.
        /// </summary>
        public UdpHeader()
            : base()
        {
            srcPort = 0;
            destPort = 0;
            udpLength = 0;
            udpChecksum = 0;

            ipv6PacketHeader = null;
            ipv4PacketHeader = null;
        }
Beispiel #2
0
        /// <summary>
        /// Constructor for the ICMPv6 header which also takes a reference to the
        /// encompassing IPv6 header. This is necessary since the IPv6 protocol
        /// defines a pseudo header checksum which requires the checksum to be
        /// calculated over fields in the ICMPv6 header and payload as well as
        /// fields from the IPv6 packet.
        /// </summary>
        /// <param name="packetHeader">Reference to the Ipv6Header object encompassing the ICMPv6 packet</param>
        public Icmpv6Header(Ipv6Header packetHeader)
            : base()
        {
            icmpType = 0;

            icmpCode = 0;

            icmpChecksum = 0;

            ipv6Header = packetHeader;
        }
Beispiel #3
0
        /// <summary>
        /// This routine creates an instance of the Ipv6Header class from a byte
        /// array that is a received IGMP packet. This is useful when a packet
        /// is received from the network and the header object needs to be
        /// constructed from those values.
        /// </summary>
        /// <param name="ipv6Packet">Byte array containing the binary IPv6 header</param>
        /// <param name="bytesCopied">Number of bytes used in header</param>
        /// <returns>Returns the Ipv6Header object created from the byte array</returns>
        public static Ipv6Header Create( byte[] ipv6Packet, ref int bytesCopied )
        {
            Ipv6Header ipv6Header = new Ipv6Header();

            byte[] addressBytes = new byte[16];

            uint tempVal = 0, tempVal2 = 0;

            // Ensure byte array is large enough to contain an IPv6 header

            if( ipv6Packet.Length < Ipv6Header.Ipv6HeaderLength )

                return null;

            tempVal = ipv6Packet[0];

            tempVal = (tempVal >> 4) & 0xF;

            ipv6Header.ipVersion = (byte)tempVal;

            tempVal = ipv6Packet[0];

            tempVal = (tempVal & 0xF) >> 4;

            ipv6Header.ipTrafficClass = (byte)(tempVal | (uint)((ipv6Packet[1] >> 4) & 0xF));

            tempVal2 = ipv6Packet[1];

            tempVal2 = (tempVal2 & 0xF) << 16;

            tempVal = ipv6Packet[2];

            tempVal = tempVal << 8;

            ipv6Header.ipFlow = tempVal2 | tempVal | ipv6Packet[3];

            ipv6Header.ipNextHeader = ipv6Packet[4];

            ipv6Header.ipHopLimit = ipv6Packet[5];

            Array.Copy( ipv6Packet, 6, addressBytes, 0, 16 );

            ipv6Header.SourceAddress = new IPAddress( addressBytes );

            Array.Copy( ipv6Packet, 24, addressBytes, 0, 16 );

            ipv6Header.DestinationAddress = new IPAddress( addressBytes );

            bytesCopied = Ipv6Header.Ipv6HeaderLength;

            return ipv6Header;
        }
Beispiel #4
0
        /// <summary>
        /// This routine builds the appropriate ICMP echo packet depending on the
        /// protocol family requested.
        /// </summary>
        public void BuildPingPacket()
        {
            // Initialize the socket if it hasn't already been done
            //Console.WriteLine( "Building the ping packet..." );
            //Console.WriteLine( "Initializing the socket if not done yet..." );

            if( pingSocket == null )
            {
                InitializeSocket();
            }

            // Clear any existing headers in the list
            //Console.WriteLine( "Clearing any existing headers in the list using Clear()..." );
            protocolHeaderList.Clear();

            if( destEndPoint.AddressFamily == AddressFamily.InterNetwork )
            {
                // Create the ICMP header and initialize the members
                //Console.WriteLine( "Creating the ICMP header and initialize the members..." );
                icmpHeader = new IcmpHeader();

                icmpHeader.Id = pingId;
                icmpHeader.Sequence = pingSequence;
                icmpHeader.Type = IcmpHeader.EchoRequestType;
                icmpHeader.Code = IcmpHeader.EchoRequestCode;

                // Build the data payload of the ICMP echo request
                //Console.WriteLine( "Building the data payload of the ICMP echo request..." );
                pingPayload = new byte[pingPayloadLength];

                for( int i = 0 ; i < pingPayload.Length ; i++ )
                {
                    pingPayload[i] = (byte)'e';
                }

                // Add ICMP header to the list of headers
                //Console.WriteLine( "Adding ICMP header to the list of headers using Add()..." );
                protocolHeaderList.Add( icmpHeader );
            }
            else if( destEndPoint.AddressFamily == AddressFamily.InterNetworkV6 )
            {
                Ipv6Header ipv6Header;     // Required for pseudo header checksum
                IPEndPoint localInterface;
                byte[] localAddressBytes = new byte[28];

                Console.WriteLine( "This part is for IPv6..." );
                // An IPv6 header is required since the IPv6 protocol specifies that the
                //    pseudo header checksum needs to be calculated on ICMPv6 packets which
                //    requires the source and destination address that will appear in the
                //    IPv6 packet.
                ipv6Header = new Ipv6Header();

                // We definitely know the destination IPv6 address but the stack will
                //    choose the "appropriate" local v6 interface depending on the
                //    routing table which may be different than the address we bound
                //    the socket to. Because of this we will call the Winsock ioctl
                //    SIO_ROUTING_INTERFACE_QUERY which will return the local interface
                //    for a given destination address by querying the routing table.
                Console.WriteLine( "Implementing the IOControl()..." );
                pingSocket.IOControl( WinsockIoctl.SIO_ROUTING_INTERFACE_QUERY, SockaddrConvert.GetSockaddrBytes( destEndPoint ), localAddressBytes );

                localInterface = SockaddrConvert.GetEndPoint( localAddressBytes );

                // Fill out the fields of the IPv6 header used in the pseudo-header checksum calculation
                Console.WriteLine( "Filling out the IPv6 header fields..." );
                ipv6Header.SourceAddress = localInterface.Address;
                ipv6Header.DestinationAddress = destEndPoint.Address;
                ipv6Header.NextHeader = 58;     // IPPROTO_ICMP6

                // Initialize the ICMPv6 header
                Console.WriteLine( "Initializing the ICMPv6 header..." );
                icmpv6Header = new Icmpv6Header( ipv6Header );
                icmpv6Header.Type = Icmpv6Header.Icmpv6EchoRequestType;
                icmpv6Header.Code = Icmpv6Header.Icmpv6EchoRequestCode;

                // Initialize the payload
                Console.WriteLine( "Initializing the payload..." );
                pingPayload = new byte[pingPayloadLength];

                for( int i = 0 ; i < pingPayload.Length ; i++ )
                {
                    pingPayload[i] = (byte)'e';
                }

                // Create the ICMPv6 echo request header
                Console.WriteLine( "Creating the ICMPv6 echo request header..." );
                icmpv6EchoRequestHeader = new Icmpv6EchoRequest();
                icmpv6EchoRequestHeader.Id = pingId;

                // Add the headers to the protocol header list
                Console.WriteLine( "Adding the headers to the protocol header list..." );
                protocolHeaderList.Add( icmpv6Header );
                protocolHeaderList.Add( icmpv6EchoRequestHeader );
            }
        }