BgpOpenMessage DecodeBgpOpenMessage(Tlv tlv)
{
using (var dataStream = new MemoryStream(tlv.Data))
{
var version = ReadNumber(dataStream, 1);
var asNum = ReadNumber(dataStream, 2);
var holdTime = ReadNumber(dataStream, 2);
var identifier = ReadNumber(dataStream, 4);
var capabilities = ParseCapabilities(dataStream);
return(new BgpOpenMessage(version, asNum, holdTime, identifier, capabilities));
}
}
public IBgpMessage Decode(Tlv tlv)
{
switch (tlv.Type)
{
case 1:
return(DecodeBgpOpenMessage(tlv));
case 2:
return(DecodeBgpUpdateMessage(tlv));
case 3:
return(new BgpKeepaliveMessage());
case 4:
return(DecodeBgpNotificationMessage(tlv));
}
throw new Exception("Could not decode message with type " + tlv.Type);
}
public void Visit(BgpNotificationMessage notificationMessage)
{
tlv = new Tlv(4, notificationMessage.data);
}
public void Visit(BgpKeepaliveMessage keepaliveMessage)
{
tlv = new Tlv(3, new byte[] { });
}
public void Visit(BgpUpdateMessage updateMessage)
{
var data = EncodePrefixes(updateMessage.prefixes);
tlv = new Tlv(2, data.ToArray());
}
public void Encode(Stream stream, Tlv tlv)
{
WriteType(stream, tlv.Type);
WriteData(stream, tlv.Data);
}
BgpNotificationMessage DecodeBgpNotificationMessage(Tlv tlv)
{
return(new BgpNotificationMessage(tlv.Data));
}