/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment">A <see cref="ByteArraySegment" /></param>
/// <param name="parentPacket">The parent packet.</param>
public GrePacket(ByteArraySegment byteArraySegment, Packet parentPacket)
{
// slice off the header portion
Header = new ByteArraySegment(byteArraySegment)
{
Length = GreFields.FlagsLength + GreFields.ProtocolLength
};
if (HasCheckSum)
{
Header.Length += GreFields.ChecksumLength;
}
if (HasReserved)
{
Header.Length += GreFields.ReservedLength;
}
if (HasKey)
{
Header.Length += GreFields.KeyLength;
}
if (HasSequence)
{
Header.Length += GreFields.SequenceLength;
}
// parse the encapsulated bytes
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() => EthernetPacket.ParseNextSegment(Header, Protocol));
ParentPacket = parentPacket;
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment">
/// A <see cref="ByteArraySegment" />
/// </param>
public IPv6Packet(ByteArraySegment byteArraySegment)
{
Log.Debug(byteArraySegment.ToString());
// IPv6 headers have a fixed length.
Header = new ByteArraySegment(byteArraySegment)
{
Length = IPv6Fields.HeaderLength
};
ParseExtensionHeaders();
Log.DebugFormat("PayloadLength: {0}", PayloadLength);
if (PayloadLength > 0)
{
// parse the payload
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() =>
{
var startingOffset = Header.Offset + Header.Length;
var segmentLength = Math.Min(PayloadLength, Header.BytesLength - startingOffset);
var bytesLength = startingOffset + segmentLength;
var payload = new ByteArraySegment(Header.Bytes, startingOffset, segmentLength, bytesLength);
return(ParseNextSegment(payload,
Protocol,
this));
});
}
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment">
/// A <see cref="ByteArraySegment" />
/// </param>
public UdpPacket(ByteArraySegment byteArraySegment)
{
Log.DebugFormat("ByteArraySegment {0}", byteArraySegment);
// set the header field, header field values are retrieved from this byte array
Header = new ByteArraySegment(byteArraySegment)
{
Length = UdpFields.HeaderLength
};
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() =>
{
const int wakeOnLanPort0 = 0;
const int wakeOnLanPort7 = 7;
const int wakeOnLanPort9 = 9;
const int l2TpPort = 1701;
const int teredoPort = 3544;
var result = new PacketOrByteArraySegment();
var destinationPort = DestinationPort;
var sourcePort = SourcePort;
var payload = Header.NextSegment();
// If this packet is going to port 0, 7 or 9, then it might be a WakeOnLan packet.
if ((destinationPort == wakeOnLanPort0) || (destinationPort == wakeOnLanPort7) || (destinationPort == wakeOnLanPort9))
{
if (WakeOnLanPacket.IsValid(payload))
{
result.Packet = new WakeOnLanPacket(payload);
return(result);
}
}
if ((destinationPort == l2TpPort) || (sourcePort == l2TpPort))
{
result.Packet = new L2tpPacket(payload, this);
return(result);
}
// Teredo encapsulates IPv6 traffic into UDP packets, parse out the bytes in the payload into packets.
// If it contains a IPV6 packet, it to this current packet as a payload.
// https://tools.ietf.org/html/rfc4380#section-5.1.1
if ((destinationPort == teredoPort) || (sourcePort == teredoPort))
{
if (ContainsIPv6Packet(payload))
{
result.Packet = new IPv6Packet(payload);
return(result);
}
}
// store the payload bytes
result.ByteArraySegment = payload;
return(result);
});
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment">
/// A <see cref="ByteArraySegment" />
/// </param>
public LinuxSllPacket(ByteArraySegment byteArraySegment)
{
Header = new ByteArraySegment(byteArraySegment)
{
Length = LinuxSllFields.SLLHeaderLength
};
// parse the payload via an EthernetPacket method
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() => EthernetPacket.ParseNextSegment(Header,
EthernetProtocolType));
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment">
/// A <see cref="ByteArraySegment" />
/// </param>
public NullPacket(ByteArraySegment byteArraySegment)
{
Log.Debug("");
// slice off the header portion as our header
// ReSharper disable once UseObjectOrCollectionInitializer
Header = new ByteArraySegment(byteArraySegment);
Header.Length = NullFields.HeaderLength;
// parse the encapsulated bytes
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() => ParseNextSegment(Header, Protocol));
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment">
/// A <see cref="ByteArraySegment" />
/// </param>
public Ieee8021QPacket(ByteArraySegment byteArraySegment)
{
// set the header field, header field values are retrieved from this byte array
Header = new ByteArraySegment(byteArraySegment)
{
Length = Ieee8021QFields.HeaderLength
};
// parse the payload via an EthernetPacket method
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() => EthernetPacket.ParseNextSegment(Header,
Type));
}
#pragma warning restore 0169, 0649
#endif
/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment">
/// A <see cref="ByteArraySegment" />
/// </param>
public IcmpV4Packet(ByteArraySegment byteArraySegment)
{
Log.Debug("");
// ReSharper disable once UseObjectOrCollectionInitializer
Header = new ByteArraySegment(byteArraySegment);
Header.Length = IcmpV4Fields.HeaderLength;
// store the payload bytes
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() => new PacketOrByteArraySegment {
ByteArraySegment = Header.NextSegment()
});
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment"></param>
public DrdaPacket(ByteArraySegment byteArraySegment)
{
Log.Debug("");
// set the header field, header field values are retrieved from this byte array
Header = new ByteArraySegment(byteArraySegment);
// store the payload bytes
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() =>
{
var result = new PacketOrByteArraySegment {
ByteArraySegment = Header.NextSegment()
};
return(result);
});
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment">
/// A <see cref="ByteArraySegment" />
/// </param>
public IgmpV2Packet(ByteArraySegment byteArraySegment)
{
// set the header field, header field values are retrieved from this byte array
// ReSharper disable once UseObjectOrCollectionInitializer
Header = new ByteArraySegment(byteArraySegment);
Header.Length = UdpFields.HeaderLength;
// store the payload bytes
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() =>
{
var result = new PacketOrByteArraySegment {
ByteArraySegment = Header.NextSegment()
};
return(result);
});
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment">
/// A <see cref="ByteArraySegment" />
/// </param>
public RawIPPacket(ByteArraySegment byteArraySegment)
{
// Pcap raw link layer format does not have any header
// you need to identify whether you have ipv4 or ipv6
// directly by checking the IP version number.
// If the first nibble is 0x04, then you have IP v4
// If the first nibble is 0x06, then you have IP v6
// The RawIPPacketProtocol enum has been defined to match this.
var firstNibble = byteArraySegment.Bytes[0] >> 4;
Protocol = (RawIPPacketProtocol)firstNibble;
Header = new ByteArraySegment(byteArraySegment)
{
Length = 0
};
// parse the encapsulated bytes
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() =>
{
var result = new PacketOrByteArraySegment();
switch (Protocol)
{
case RawIPPacketProtocol.IPv4:
{
result.Packet = new IPv4Packet(Header.NextSegment());
break;
}
case RawIPPacketProtocol.IPv6:
{
result.Packet = new IPv6Packet(Header.NextSegment());
break;
}
default:
{
throw new NotImplementedException("Protocol of " + Protocol + " is not implemented");
}
}
return(result);
});
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment">
/// A <see cref="ByteArraySegment" />
/// </param>
public TcpPacket(ByteArraySegment byteArraySegment)
{
Log.Debug("");
// set the header field, header field values are retrieved from this byte array
// ReSharper disable once UseObjectOrCollectionInitializer
Header = new ByteArraySegment(byteArraySegment);
Header.Length = DataOffset * 4;
// NOTE: we update the Length field AFTER the header field because
// we need the header to be valid to retrieve the value of DataOffset
// store the payload bytes
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() =>
{
var result = new PacketOrByteArraySegment {
ByteArraySegment = Header.NextSegment()
};
return(result);
});
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment">
/// A <see cref="ByteArraySegment" />
/// </param>
public IPv4Packet(ByteArraySegment byteArraySegment)
{
Log.Debug("");
Header = new ByteArraySegment(byteArraySegment);
// TCP offload engine (TOE), see http://en.wikipedia.org/wiki/TCP_offload_engine
var totalLength = TotalLength;
if (totalLength == 0)
{
totalLength = Header.Length;
TotalLength = totalLength;
}
// Check that the TotalLength is valid, at least HeaderMinimumLength long
if (totalLength < HeaderMinimumLength)
{
ThrowHelper.ThrowInvalidOperationException(ExceptionDescription.TotalLengthBelowMinimumHeaderLength);
}
// update the header length with the correct value
// NOTE: we take care to convert from 32-bit words into bytes
// NOTE: we do this *after* setting header because we need header to be valid
// before we can retrieve the HeaderLength property
Header.Length = HeaderLength * 4;
Log.DebugFormat("IPv4Packet HeaderLength {0}", HeaderLength);
Log.DebugFormat("header {0}", Header);
// parse the payload
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() =>
{
var payload = Header.NextSegment(PayloadLength);
return(ParseNextSegment(payload,
Protocol,
this));
});
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="byteArraySegment">
/// A <see cref="ByteArraySegment" />
/// </param>
public UdpPacket(ByteArraySegment byteArraySegment)
{
Log.DebugFormat("ByteArraySegment {0}", byteArraySegment);
// set the header field, header field values are retrieved from this byte array
Header = new ByteArraySegment(byteArraySegment)
{
Length = UdpFields.HeaderLength
};
PayloadPacketOrData = new LazySlim <PacketOrByteArraySegment>(() =>
{
const int wakeOnLanPort0 = 0;
const int wakeOnLanPort7 = 7;
const int wakeOnLanPort9 = 9;
var result = new PacketOrByteArraySegment();
var destinationPort = DestinationPort;
var sourcePort = SourcePort;
var payload = Header.NextSegment();
// If this packet is going to port 0, 7 or 9, then it might be a WakeOnLan packet.
if (destinationPort == wakeOnLanPort0 || destinationPort == wakeOnLanPort7 || destinationPort == wakeOnLanPort9)
{
if (WakeOnLanPacket.IsValid(payload))
{
result.Packet = new WakeOnLanPacket(payload);
return(result);
}
}
if (destinationPort == L2tpFields.Port || sourcePort == L2tpFields.Port)
{
result.Packet = new L2tpPacket(payload, this);
return(result);
}
if ((sourcePort == DhcpV4Fields.ClientPort || sourcePort == DhcpV4Fields.ServerPort) &&
(destinationPort == DhcpV4Fields.ClientPort || destinationPort == DhcpV4Fields.ServerPort))
{
var nextSegmentLength = byteArraySegment.Length - Header.Length;
if (nextSegmentLength >= DhcpV4Fields.MinimumSize)
{
var nextSegment = new ByteArraySegment(byteArraySegment.Bytes, byteArraySegment.Offset + Header.Length, nextSegmentLength);
var magicNumber = EndianBitConverter.Big.ToUInt32(nextSegment.Bytes, nextSegment.Offset + DhcpV4Fields.MagicNumberPosition);
if (magicNumber == DhcpV4Fields.MagicNumber)
{
result.Packet = new DhcpV4Packet(nextSegment, this);
return(result);
}
}
}
// Teredo encapsulates IPv6 traffic into UDP packets, parse out the bytes in the payload into packets.
// If it contains a IPV6 packet, it to this current packet as a payload.
// https://tools.ietf.org/html/rfc4380#section-5.1.1
if (destinationPort == IPv6Fields.TeredoPort || sourcePort == IPv6Fields.TeredoPort)
{
if (ContainsIPv6Packet(payload))
{
result.Packet = new IPv6Packet(payload);
return(result);
}
}
// store the payload bytes
result.ByteArraySegment = payload;
return(result);
});
}