protected override bool TryParse(IpPacket packet, out IEnvelope envelope)
{
envelope = null;
if (!packet.PacketHeader.DestinationIpAddress.Equals(this.ListenEndPoint.Address))
{
return(false);
}
var upacket = packet.ToUdpDatagram();
var isValid = upacket.UdpDatagramHeader.DestinationPort == this.ListenEndPoint.Port;
if (isValid)
{
envelope = new UdpEnvelope
{
OccurrenceTime = packet.ReceivedTime,
ReceivedTime = packet.ReceivedTime,
Payload = packet.PacketData.Array,
PayloadInstance = upacket,
};
}
return(isValid);
}
/// <summary>
/// Produces a IpPacket based on input
/// </summary>
/// <param name="ReceivedPacket">IpPacket to copy to a new instance</param>
/// <remarks> This method copies all data from the ReceivedPacket into a new packet, including byte arrays.</remarks>
public IpPacket(IpPacket ReceivedPacket)
: this()
{
ReceivedTime = ReceivedPacket.ReceivedTime;
IpVersion = ReceivedPacket.IpVersion;
InternetHeaderLength = ReceivedPacket.InternetHeaderLength;
DscpValue = ReceivedPacket.DscpValue;
ExplicitCongestionNotice = ReceivedPacket.ExplicitCongestionNotice;
IpPacketLength = ReceivedPacket.IpPacketLength;
FragmentGroupId = ReceivedPacket.FragmentGroupId;
IpHeaderFlags = ReceivedPacket.IpHeaderFlags;
FragmentOffset = ReceivedPacket.FragmentOffset;
TimeToLive = ReceivedPacket.TimeToLive;
ProtocolNumber = ReceivedPacket.ProtocolNumber;
Protocol = ReceivedPacket.Protocol;
PacketHeaderChecksum = ReceivedPacket.PacketHeaderChecksum;
SourceIpAddress = new IPAddress(ReceivedPacket.SourceIpAddress.GetAddressBytes());
DestinationIpAddress = new IPAddress(ReceivedPacket.DestinationIpAddress.GetAddressBytes());
if (ReceivedPacket.IpOptions != null)
{
IpOptions = new byte[ReceivedPacket.IpOptions.Length];
Array.Copy(ReceivedPacket.IpOptions, IpOptions, ReceivedPacket.IpOptions.Length);
}
if (ReceivedPacket.PacketData != null)
{
PacketData = new byte[ReceivedPacket.PacketData.Length];
Array.Copy(ReceivedPacket.PacketData, PacketData, ReceivedPacket.PacketData.Length);
}
if (ReceivedPacket.DataBuffer != null)
{
DataBuffer = new byte[ReceivedPacket.DataBuffer.Length];
Array.Copy(ReceivedPacket.DataBuffer, DataBuffer, ReceivedPacket.DataBuffer.Length);
}
}
/// <summary>
/// Takes an IpPacket object and encodes it for transmission on the network in a byte array. Includes computing checksums.
/// </summary>
/// <param name="Packet">Packet object for encoding.</param>
/// <returns>Network order byte array with IP checksum included ready to send on a raw socket.</returns>
public static byte[] ToWireBytes(this IpPacket Packet)
{
using (var builderStream = new MemoryStream())
{
var header = PacketHeaderToWireBytes(Packet);
builderStream.Write(header, 0, header.Length);
builderStream.Write(Packet.PacketData, 0, Packet.PacketData.Length);
return(builderStream.ToArray());
}
}
/// <summary>
/// Takes an IpPacket object and encodes the IP header for transmission on the network in a byte array. Includes computing checksums.
/// </summary>
/// <param name="Packet">Packet object for encoding.</param>
/// <returns>The IP header in network order byte array with checksums included.</returns>
public static byte[] PacketHeaderToWireBytes(this IpPacket Packet)
{
using (var builderStream = new MemoryStream())
{
//ipVers bits 0 to 3
//InternetHeaderLength bits 4 to 7
var ipversion = Packet.IpVersion == NetworkInterfaceComponent.IPv4 ? 4 : 6;
var byte0 = (byte)BitConverter.GetBytes((ipversion << 4) + Packet.InternetHeaderLength)[0];
builderStream.WriteByte(byte0);
//DscpValue 8 to 13
//ExplicitCongestionNotice 14 to 15
var byte1 = (byte)BitConverter.GetBytes(((int)Packet.DscpValue << 2) + Packet.ExplicitCongestionNotice)[0];
builderStream.WriteByte(byte1);
//IpPacketLength 16 to 31
var byte23 = BitConverter.GetBytes(NetworkOrderUshort(Packet.IpPacketLength));
builderStream.Write(byte23, 0, 2);
//FragmentGroupId 32 to 47
var byte45 = BitConverter.GetBytes(NetworkOrderUshort(Packet.FragmentGroupId));
builderStream.Write(byte45, 0, 2);
//IpHeaderFlags 48 to 50
//FragmentOffset 51 to 63
var byte67 = BitConverter.GetBytes(((int)Packet.IpHeaderFlags << 13) + Packet.FragmentOffset);
builderStream.WriteByte(byte67[0]);
builderStream.WriteByte(byte67[1]);
//TimeToLive 64 to 71
builderStream.WriteByte(Packet.TimeToLive);
//ProtocolNumber 72 to 79
builderStream.WriteByte(Packet.ProtocolNumber);
//PacketHeaderChecksum 80 to 95
builderStream.Write(BitConverter.GetBytes(0), 0, 2); //put all zeros in here and calculate it below.
//SourceIpAddress 96 to 127
builderStream.Write(Packet.SourceIpAddress.GetAddressBytes(), 0, 4);
//DestinationIpAddress 128 to 160
builderStream.Write(Packet.DestinationIpAddress.GetAddressBytes(), 0, 4);
if (Packet.IpOptions != null)
{
builderStream.Write(Packet.IpOptions, 0, Packet.IpOptions.Length);
}
var headerBytes = builderStream.ToArray();
var sum = GetInternetChecksum(headerBytes);
Array.Copy(BitConverter.GetBytes(sum), 0, headerBytes, 10, 2);
return(headerBytes);
}
}
/// <summary>
/// Decodes a UdpDatagram Datagram
/// </summary>
public UdpDatagram(IpPacket ReceivedPacket) : base(ReceivedPacket)
{
if (Protocol != ProtocolType.Udp) throw new ArgumentException("Received Packet is not UDP");
IsUdp = true;
UdpData = new byte[PacketData.Length - 8];
Array.Copy(PacketData, 8, UdpData, 0, PacketData.Length - 8);
if (PacketData.Length > 8)
{
SourcePort = PacketData.ReadNetOrderUShort(0);
DestinationPort = PacketData.ReadNetOrderUShort(2);
UdpLength = PacketData.ReadNetOrderUShort(4);
UdpCheckSum = PacketData.ReadNetOrderUShort(6);
}
}
/// <summary>
/// Decodes a UdpDatagram Datagram
/// </summary>
public UdpDatagram(IpPacket ReceivedPacket) : base(ReceivedPacket)
{
if (Protocol != ProtocolType.Udp)
{
throw new ArgumentException("Received Packet is not UDP");
}
IsUdp = true;
UdpData = new byte[PacketData.Length - 8];
Array.Copy(PacketData, 8, UdpData, 0, PacketData.Length - 8);
if (PacketData.Length > 8)
{
SourcePort = PacketData.ReadNetOrderUShort(0);
DestinationPort = PacketData.ReadNetOrderUShort(2);
UdpLength = PacketData.ReadNetOrderUShort(4);
UdpCheckSum = PacketData.ReadNetOrderUShort(6);
}
}
protected override bool TryParse(IpPacket packet, out IUdpDatagram result)
{
result = null;
if (!packet.PacketHeader.DestinationIpAddress.Equals(this.ListenEndPoint.Address))
{
return(false);
}
var upacket = packet.ToUdpDatagram();
var isValid = upacket.UdpDatagramHeader.DestinationPort == this.ListenEndPoint.Port;
if (isValid)
{
result = upacket;
}
return(isValid);
}
/// <summary>
/// Used to create a primitive packet or datagram for encoding to the network.
/// </summary>
/// <param name="Packet">A source IpPacket Object that contains a UDP datagram</param>
/// <param name="SourcePort">Source port for the datagram.</param>
/// <param name="DestinationPort">Destination port for the datagram</param>
/// <param name="UdpLength">The length of the UDP datagram including the UDP header</param>
/// <param name="UdpData">The data following the UDP header. If this is null the Packet object's packet data is used.</param>
/// <remarks>The IP Header and UDP Checksum is set by calling the ToWirebytes method to encode the packet to the wire.</remarks>
public UdpDatagram(IpPacket Packet, ushort SourcePort, ushort DestinationPort, ushort UdpLength, byte[] UdpData)
: base(Packet)
{
if (Packet.Protocol != ProtocolType.Udp)
{
throw new InvalidDataException("Input Packet must be of protocol type UDP");
}
this.SourcePort = SourcePort;
this.DestinationPort = DestinationPort;
this.UdpLength = UdpLength;
this.UdpCheckSum = 0;
this.UdpData = new byte[UdpLength - 8];
if (UdpData == null)
{
Array.Copy(Packet.PacketData, Packet.InternetHeaderLength * 4 + 8, this.UdpData, 0, UdpLength - 8);
}
else
{
Array.Copy(UdpData, this.UdpData, UdpLength - 8);
}
IsUdp = true;
}
/// <summary>
/// Produces a IpPacket based on input
/// </summary>
/// <param name="ReceivedPacket">IpPacket to copy to a new instance</param>
/// <remarks> This method copies all data from the ReceivedPacket into a new packet, including byte arrays.</remarks>
public IpPacket(IpPacket ReceivedPacket): this()
{
ReceivedTime = ReceivedPacket.ReceivedTime;
IpVersion = ReceivedPacket.IpVersion;
InternetHeaderLength = ReceivedPacket.InternetHeaderLength;
DscpValue = ReceivedPacket.DscpValue;
ExplicitCongestionNotice = ReceivedPacket.ExplicitCongestionNotice;
IpPacketLength = ReceivedPacket.IpPacketLength;
FragmentGroupId = ReceivedPacket.FragmentGroupId;
IpHeaderFlags = ReceivedPacket.IpHeaderFlags;
FragmentOffset = ReceivedPacket.FragmentOffset;
TimeToLive = ReceivedPacket.TimeToLive;
ProtocolNumber = ReceivedPacket.ProtocolNumber;
Protocol = ReceivedPacket.Protocol;
PacketHeaderChecksum = ReceivedPacket.PacketHeaderChecksum;
SourceIpAddress = new IPAddress(ReceivedPacket.SourceIpAddress.GetAddressBytes());
DestinationIpAddress = new IPAddress(ReceivedPacket.DestinationIpAddress.GetAddressBytes());
if (ReceivedPacket.IpOptions != null) {
IpOptions = new byte[ReceivedPacket.IpOptions.Length];
Array.Copy(ReceivedPacket.IpOptions, IpOptions, ReceivedPacket.IpOptions.Length);
}
if (ReceivedPacket.PacketData != null) {
PacketData =new byte[ReceivedPacket.PacketData.Length];
Array.Copy(ReceivedPacket.PacketData, PacketData, ReceivedPacket.PacketData.Length);
}
if (ReceivedPacket.DataBuffer != null)
{
DataBuffer = new byte[ReceivedPacket.DataBuffer.Length];
Array.Copy(ReceivedPacket.DataBuffer, DataBuffer, ReceivedPacket.DataBuffer.Length);
}
}
protected abstract bool TryParse(IpPacket packet, out T envelope);
/// <summary>
/// Creates an instance of a Log object.
/// </summary>
/// <param name="ReceivedPacket">An IP object generated on data received on a Raw socket. </param>
/// <param name="Parser">A regular expression that will be used to parse the internal message of the Log.</param>
public Syslog(IpPacket ReceivedPacket, Regex Parser)
: this(new UdpDatagram(ReceivedPacket), Parser)
{
}
/// <summary>
/// Creates an instance of a Log object.
/// </summary>
/// <param name="ReceivedPacket">An IP object generated on data received on a Raw socket. </param>
/// <param name="Parser">A regular expression that will be used to parse the internal message of the Log.</param>
public Syslog(IpPacket ReceivedPacket, Regex Parser) : this(new UdpDatagram(ReceivedPacket), Parser) { }
