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package com.lumaserv.bgp;
import com.lumaserv.bgp.protocol.AFI;
import com.lumaserv.bgp.protocol.BGPPacket;
import com.lumaserv.bgp.protocol.SAFI;
import com.lumaserv.bgp.protocol.message.BGPNotification;
import com.lumaserv.bgp.protocol.message.BGPOpen;
import com.lumaserv.bgp.protocol.message.BGPUpdate;
import lombok.Getter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketException;
public class BGPSession implements Runnable {
@Getter
final BGPServer server;
@Getter
final BGPSessionConfiguration configuration;
final String host;
final int port;
Socket socket;
InputStream inputStream;
OutputStream outputStream;
@Getter
boolean closed;
boolean outgoing;
@Getter
BGPFsm fsm;
Thread thread;
boolean isAdvAS4Capability;
@Getter
boolean isAS4Capability;
@Getter
byte[] remoteIdentifier;
public BGPSession(BGPServer server, Socket socket, BGPSessionConfiguration configuration, BGPFsm fsm) throws IOException {
this.server = server;
this.configuration = configuration;
this.socket = socket;
this.inputStream = socket.getInputStream();
this.outputStream = socket.getOutputStream();
this.fsm = fsm;
this.host = null;
this.port = -1;
}
public BGPSession(BGPServer server, BGPSessionConfiguration configuration, BGPFsm fsm, String host, int port) throws IOException {
this.server = server;
this.configuration = configuration;
this.fsm = fsm;
this.host = host;
this.port = port;
}
public InetAddress getInetAddress() {
return socket.getInetAddress();
}
public InetAddress getLocalAddress() {
return socket.getLocalAddress();
}
protected void finalize() throws Throwable {
System.out.println("Finalize BGPSession");
}
public void automaticStop() {
fsm.getCurrentState().automaticStop();
}
public void keepAlive() {
try {
outputStream.write(new BGPPacket().setType(BGPPacket.Type.KEEPALIVE).setMessage(new byte[0]).build());
} catch (IOException e) {
e.printStackTrace();
}
}
private void handle(BGPPacket packet) {
switch (packet.getType()) {
case NOTIFICATION:
BGPNotification notif = new BGPNotification(packet.getMessage());
if (notif.getMajorErrorCode() == BGPNotification.Error.MESSAGE_HEADER_ERROR.getCode() &&
notif.getMinorErrorCode() == BGPNotification.OpenMessageError.UNSUPPORTED_VERSION_NUMBER.getCode())
fsm.getCurrentState().notifMsgVerErr(notif);
else
fsm.getCurrentState().notifMsg(notif);
break;
case KEEPALIVE:
fsm.getCurrentState().keepAliveMsg();
//keepAlive();
break;
case OPEN:
BGPOpen open = new BGPOpen(packet.getMessage());
if (server.hasCollided(this, open)) {
BGPNotification notification = new BGPNotification()
.setMajorErrorCode(BGPNotification.Error.CEASE.getCode());
try {
sendNotification(notification);
} catch(IOException ex) {
}
dropConnection();
// TODO Break links between fsm and session!
} else {
isAS4Capability = isAdvAS4Capability && open.getAS4Capability().isPresent();
remoteIdentifier = open.getIdentifier();
fsm.getCurrentState().openMsg(open);
}
break;
case UPDATE: {
BGPUpdate update = new BGPUpdate(this, packet.getMessage());
fsm.getCurrentState().updateMsg(update);
configuration.getListener().onUpdate(this, update);
break;
}
}
}
public void startIncoming() {
outgoing = false;
thread = new Thread(this);
thread.start();
}
public void startOutgoing() {
outgoing = true;
thread = new Thread(this);
thread.start();
}
void sendNotification(BGPNotification notification) throws IOException {
outputStream.write(new BGPPacket().setType(BGPPacket.Type.NOTIFICATION).setMessage(notification.build()).build());
}
void sendOpen(BGPOpen request) throws IOException {
isAdvAS4Capability = request.getAS4Capability().isPresent();
outputStream.write(new BGPPacket().setType(BGPPacket.Type.OPEN).setMessage(request.build()).build());
System.out.println("Sent open");
}
public void sendOpen() throws IOException {
BGPOpen.Capabilities caps = new BGPOpen.Capabilities();
caps.getCapabilities().add(new BGPOpen.MultiprotocolExtensionCapability(AFI.IPV4.getValue(), SAFI.UNICAST.getValue()));
caps.getCapabilities().add(new BGPOpen.MultiprotocolExtensionCapability(AFI.IPV6.getValue(), SAFI.UNICAST.getValue()));
caps.getCapabilities().add(new BGPOpen.AS4Capability(configuration.getLocalAs()));
BGPOpen request = new BGPOpen()
.setHoldTime(BGPFsm.CONFIG_HOLD_TIME)
.setVersion(BGPFsm.CONFIG_VERSION)
.setIdentifier(configuration.getLocalIdentifier());
if ((configuration.getLocalAs() & 0xFFFFFFFFL) < 0xFFFF)
request.setAsn(configuration.getLocalAs());
request.getOptionalParameters().add(caps);
sendOpen(request);
}
public void retryConnection() {
if (!socket.isConnected()) {
try {
socket.close();
} catch (IOException ex) {
ex.printStackTrace();
throw new RuntimeException(ex);
}
}
}
public void dropConnection() {
closed = true;
try {
if (outputStream != null)
outputStream.close();
if (inputStream != null)
inputStream.close();
socket.close();
} catch (IOException ex) {
ex.printStackTrace();
throw new RuntimeException(ex);
}
}
public void run() {
try {
if (socket == null) {
while (true) {
try {
System.out.println("Outgoing");
socket = new Socket();
socket.connect(new InetSocketAddress(host, port));
break;
} catch(IOException ex) {
if (closed) {
throw new IOException("Closed", ex);
}
}
}
System.out.println("Outgoing accepted");
inputStream = socket.getInputStream();
outputStream = socket.getOutputStream();
fsm.getCurrentState().tcpCRAcked();
} else {
System.out.println("Incoming");
fsm.getCurrentState().tcpConnectionConfirmed();
}
while (!closed) {
handle(BGPPacket.read(inputStream));
}
System.out.println("Closed!");
} catch (IOException ex) {
if (!closed) {
fsm.getCurrentState().tcpConnectionFails();
ex.printStackTrace();
}
closed = true;
configuration.getListener().onClose(this);
}
}
}
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