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package com.lumaserv.bgp.protocol;
import com.lumaserv.bgp.protocol.DataBuilder;
import com.lumaserv.bgp.protocol.message.BGPOpen;
import com.lumaserv.bgp.protocol.message.BGPUpdate;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
@Setter
@Getter
@NoArgsConstructor
public class BGPPacket {
Type type;
DataBuilder message;
public BGPPacket(ByteBuffer packet) {
type = Type.fromValue(packet.get());
switch (type) {
case OPEN:
message = new BGPOpen(packet);
break;
case UPDATE:
message = new BGPUpdate(packet);
break;
default:
System.out.println("type: " + type);
break;
}
}
public byte[] build() {
ByteBuffer buf = ByteBuffer.allocate(4096).order(ByteOrder.BIG_ENDIAN); // Maximum BGP message size
for (int i=0; i<16; i++)
buf.put((byte) 0xFF);
buf.putShort((short)19); // Length without message payload
buf.put(type.getValue());
if (message != null) {
message.build(buf);
buf.putShort(16, (short)buf.position()); // Set length
}
byte[] packet = new byte[buf.position()];
buf.position(0);
buf.get(packet); // TODO is working?
return packet;
}
public static BGPPacket read(InputStream stream) throws IOException {
ByteBuffer buf = ByteBuffer.allocate(4096).order(ByteOrder.BIG_ENDIAN);
int value;
for(int i=0; i<18; i++) {
value = stream.read();
if(value == -1)
throw new IOException("Unexpected end of stream");
buf.put((byte) value);
}
int length = buf.getShort(16);
for(int i=18; i<length; i++) {
value = stream.read();
if(value == -1)
throw new IOException("Unexpected end of stream");
buf.put((byte) value);
}
buf.limit(buf.position());
buf.position(18);
return new BGPPacket(buf);
}
@AllArgsConstructor
@Getter
public enum Type {
OPEN((byte) 1),
UPDATE((byte) 2),
NOTIFICATION((byte) 3),
KEEPALIVE((byte) 4),
ROUTE_REFRESH((byte) 5);
final byte value;
public static Type fromValue(byte value) {
for(Type t : values()) {
if(t.value == value)
return t;
}
return null;
}
}
}
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