internal DHCPv6RelayPacket(
DHCPv6PacketTypes type,
Byte hopCount,
IPv6Address linkAddress, IPv6Address peerAddress,
IEnumerable <DHCPv6PacketOption> options,
DHCPv6Packet innerPacket) : base(type, options)
{
HopCount = hopCount;
LinkAddress = linkAddress;
PeerAddress = peerAddress;
InnerPacket = innerPacket;
}
public static DHCPv6RelayPacket AsInnerRelay(
Boolean isForward,
Byte hopCount,
IPv6Address linkAddress, IPv6Address peerAddress,
IEnumerable <DHCPv6PacketOption> options,
DHCPv6Packet innerPacket
) => new DHCPv6RelayPacket(
isForward == true ? DHCPv6PacketTypes.RELAY_FORW : DHCPv6PacketTypes.RELAY_REPL,
hopCount,
linkAddress,
peerAddress,
options,
innerPacket
);
internal static DHCPv6RelayPacket ConstructRelayPacket(DHCPv6RelayPacket receivedPacket, DHCPv6Packet innerResponse)
{
DHCPv6Packet innerPacket = innerResponse;
Byte hopCount = GetRelayPacketNumber(receivedPacket);
if (receivedPacket.InnerPacket is DHCPv6RelayPacket packet)
{
innerPacket = ConstructRelayPacket(packet, innerResponse);
}
DHCPv6RelayPacket responsePacket = new DHCPv6RelayPacket(DHCPv6PacketTypes.RELAY_REPL,
hopCount, receivedPacket.LinkAddress, receivedPacket.PeerAddress, receivedPacket.Options.ToList(), innerPacket);
return(responsePacket);
}
internal static DHCPv6RelayPacket FromByteArray(byte[] rawData, int offset)
{
DHCPv6PacketTypes type = (DHCPv6PacketTypes)rawData[offset];
offset += 1;
Byte hopCount = rawData[offset];
offset += 1;
IPv6Address linkAddress = IPv6Address.FromByteArray(rawData, offset);
offset += 16;
IPv6Address peerAddress = IPv6Address.FromByteArray(rawData, offset);
offset += 16;
List <DHCPv6PacketOption> options = new List <DHCPv6PacketOption>();
Byte[] innerPacketOptionValue = null;
Int32 byteIndex = offset;
while (byteIndex < rawData.Length)
{
UInt16 optionCode = ByteHelper.ConvertToUInt16FromByte(rawData, byteIndex);
UInt16 length = ByteHelper.ConvertToUInt16FromByte(rawData, byteIndex + 2);
Byte[] optionData = ByteHelper.CopyData(rawData, byteIndex, length + 4);
if (optionCode == (Byte)DHCPv6PacketOptionTypes.RelayMessage)
{
innerPacketOptionValue = ByteHelper.CopyData(optionData, 4);
}
else
{
DHCPv6PacketOption suboption = DHCPv6PacketOptionFactory.GetOption(optionCode, optionData);
options.Add(suboption);
}
byteIndex += 4 + length;
}
return(new DHCPv6RelayPacket(
type,
hopCount,
linkAddress, peerAddress,
options,
DHCPv6Packet.FromByteArray(innerPacketOptionValue)));
}
