public void run() {
while (true) {
LinkedList<PacketCallbackStruct> list = null;
try {
queuedPacketCallbacksLock.lock();
try {
queuedPacketCallbacksNotEmpty.await();
} catch (Exception e) {
Log.error(
"RDPServer.PacketCallbackThread: queuedPacketCallbacksNotEmpty.await() caught exception "
+ e.getMessage());
}
list = queuedPacketCallbacks;
queuedPacketCallbacks = new LinkedList<PacketCallbackStruct>();
} finally {
queuedPacketCallbacksLock.unlock();
}
if (Log.loggingNet)
Log.net("RDPServer.PacketCallbackThread: Got " + list.size() + " queued packets");
for (PacketCallbackStruct pcs : list) {
try {
callbackProcessPacket(pcs.cb, pcs.con, pcs.packet);
} catch (Exception e) {
Log.exception("RDPServer.PacketCallbackThread: ", e);
}
}
}
}
public class RDPServer implements Runnable {
RDPServer() {}
/** rdpserversocket wants to bind on a local port */
static DatagramChannel bind(Integer port, int receiveBufferSize)
throws java.net.BindException, java.io.IOException, java.net.SocketException {
lock.lock();
try {
// see if there is an existing datagramchannel bound to this port
DatagramChannel dc = channelMap.get(port);
if (dc != null) {
throw new java.net.BindException("RDPServer.bind: port is already used");
}
// make a new datagram channel
dc = DatagramChannel.open();
dc.configureBlocking(false);
dc.socket().setReceiveBufferSize(receiveBufferSize);
if (port == null) {
if (Log.loggingNet) Log.net("RDPServer.bind: binding to a random system port");
dc.socket().bind(null);
} else {
if (Log.loggingNet) Log.net("RDPServer.bind: binding to port " + port);
dc.socket().bind(new InetSocketAddress(port));
}
int resultingPort = dc.socket().getLocalPort();
if (Log.loggingNet) Log.net("RDPServer.bind: resulting port=" + resultingPort);
// add the channel to the channel map
channelMap.put(resultingPort, dc);
if (Log.loggingNet) Log.net("RDPServer.bind: added dc to channel map");
// add the channel to the newChannelsSet
// we want to register this channel with the selector
// but the selector thread needs to do that,
// so place it in this set, and wake up the selector
newChannelSet.add(dc);
if (Log.loggingNet) Log.net("RDPServer.bind: added dc to newChannelSet");
// in case the rdpserver was waiting while it had no sockets,
// signal it
channelMapNotEmpty.signal();
Log.net("RDPServer.bind: signalled channel map not empty condition");
// wakeup the selector -
// it needs to register the new channel with itself
selector.wakeup();
if (Log.loggingNet) Log.net("RDPServer.bind: woke up selector");
return dc;
} finally {
lock.unlock();
}
}
/**
* assume the socket is already bound, now we need to add it to the socket map
*
* <p>this map is used when we get a packet and look up the datagramchannel to see if its
* associated with a listening socket for a new rdp connection
*/
static void registerSocket(RDPServerSocket rdpSocket, DatagramChannel dc) {
lock.lock();
try {
socketMap.put(dc, rdpSocket);
} finally {
lock.unlock();
}
}
/** the conn data should already be set (remote addr, etc) */
static void registerConnection(RDPConnection con, DatagramChannel dc) {
lock.lock();
try {
if (Log.loggingNet) Log.net("RDPServer.registerConnection: registering con " + con);
// first we get the set of connections attached to the given dc
Map<ConnectionInfo, RDPConnection> dcConMap = allConMap.get(dc);
if (dcConMap == null) {
dcConMap = new HashMap<ConnectionInfo, RDPConnection>();
}
// add this connection to the map
int localPort = con.getLocalPort();
int remotePort = con.getRemotePort();
InetAddress remoteAddr = con.getRemoteAddr();
ConnectionInfo conInfo = new ConnectionInfo(remoteAddr, remotePort, localPort);
dcConMap.put(conInfo, con);
allConMap.put(dc, dcConMap);
} finally {
lock.unlock();
}
}
/**
* removes this connection from the connections map the datagram channel still sticks around in
* case it needs to be reused
*/
static void removeConnection(RDPConnection con) {
lock.lock();
try {
if (Log.loggingNet) Log.net("RDPServer.removeConnection: removing con " + con);
con.setState(RDPConnection.CLOSED);
DatagramChannel dc = con.getDatagramChannel();
// first we get the set of connections attached to the given dc
Map<ConnectionInfo, RDPConnection> dcConMap = allConMap.get(dc);
if (dcConMap == null) {
throw new MVRuntimeException("RDPServer.removeConnection: cannot find dc");
}
int localPort = con.getLocalPort();
int remotePort = con.getRemotePort();
InetAddress remoteAddr = con.getRemoteAddr();
ConnectionInfo conInfo = new ConnectionInfo(remoteAddr, remotePort, localPort);
Object rv = dcConMap.remove(conInfo);
if (rv == null) {
throw new MVRuntimeException("RDPServer.removeConnection: could not find the connection");
}
// close the datagramchannel if needed
// conditions: no other connections on this datagramchannel
// no socket listening on this datagramchannel
if (dcConMap.isEmpty()) {
Log.net("RDPServer.removeConnection: no other connections for this datagramchannel (port)");
// there are no more connections on this datagram channel
// check if there is a serversocket listening
if (getRDPSocket(dc) == null) {
Log.net("RDPServer.removeConnection: no socket listening on this port - closing");
// no socket either, close the datagramchannel
dc.socket().close();
channelMap.remove(localPort);
Log.net("RDPServer.removeConnection: closed and removed datagramchannel/socket");
} else {
Log.net("RDPServer.removeConnection: there is a socket listening on this port");
}
} else {
Log.net("RDPServer.removeConnection: there are other connections on this port");
}
} finally {
lock.unlock();
}
}
// ////////////////////////////////////////////////////////////////
//
// internal working
//
// ////////////////////////////////////////////////////////////////
/** starts the server listens to incoming packets */
public void run() {
try {
while (true) {
if (Log.loggingNet) Log.net("In RDPServer.run: starting new iteration");
try {
Set<DatagramChannel> activeChannels = getActiveChannels();
activeChannelCalls++;
Iterator<DatagramChannel> iter = activeChannels.iterator();
while (iter.hasNext()) {
DatagramChannel dc = iter.next();
if (Log.loggingNet) Log.net("In RDPServer.run: about to call processActiveChannel");
processActiveChannel(dc);
if (Log.loggingNet) Log.net("In RDPServer.run: returned from processActiveChannel");
}
} catch (ClosedChannelException ex) {
// ignore
} catch (Exception e) {
Log.exception("RDPServer.run caught exception", e);
}
}
} finally {
Log.warn("RDPServer.run: thread exiting");
}
}
/**
* a DatagramChannel has data ready - process all the pending packets, whether its for a
* rdpserversocket or rdpconnection.
*/
void processActiveChannel(DatagramChannel dc) throws ClosedChannelException {
RDPPacket packet;
int count = 0;
// read in the packet
try {
Set<RDPConnection> needsAckConnections = new HashSet<RDPConnection>();
while ((packet = RDPServer.receivePacket(dc)) != null) {
if (Log.loggingNet)
Log.net(
"RDPServer.processActiveChannel: Starting iteration with count of "
+ count
+ " packets");
// see if there is a connection already for this packet
InetAddress remoteAddr = packet.getInetAddress();
int remotePort = packet.getPort();
int localPort = dc.socket().getLocalPort();
ConnectionInfo conInfo = new ConnectionInfo(remoteAddr, remotePort, localPort);
RDPConnection con = RDPServer.getConnection(dc, conInfo);
if (con != null) {
if (Log.loggingNet)
Log.net("RDPServer.processActiveChannel: found an existing connection: " + con);
count++;
if (processExistingConnection(con, packet)) needsAckConnections.add(con);
// Prevent this from blocking getActiveChannels by
// putting an upper bound on the number of packets
// processed
if (count >= 20) break;
continue;
} else {
Log.net("RDPServer.processActiveChannel: did not find an existing connection");
}
// there is no connection,
// see if there is a socket listening for new connection
RDPServerSocket rdpSocket = RDPServer.getRDPSocket(dc);
if (rdpSocket != null) {
count++;
processNewConnection(rdpSocket, packet);
return;
}
return;
}
// Finally, send out the acks
for (RDPConnection con : needsAckConnections) {
RDPPacket replyPacket = new RDPPacket(con);
con.sendPacketImmediate(replyPacket, false);
}
} catch (ClosedChannelException ex) {
Log.error("RDPServer.processActiveChannel: ClosedChannel " + dc.socket());
throw ex;
} finally {
if (Log.loggingNet)
Log.net("RDPServer.processActiveChannel: Returning after processing " + count + " packets");
}
}
/**
* there is a socket listening on the port for this packet. process if it is a new connection rdp
* packet
*/
public void processNewConnection(RDPServerSocket serverSocket, RDPPacket packet) {
if (Log.loggingNet)
Log.net(
"processNewConnection: RDPPACKET (localport=" + serverSocket.getPort() + "): " + packet);
// int localPort = serverSocket.getPort();
InetAddress remoteAddr = packet.getInetAddress();
int remotePort = packet.getPort();
if (!packet.isSyn()) {
// the client is not attemping to start a new connection
// send a reset and forget about it
Log.debug("socket got non-syn packet, replying with reset: packet=" + packet);
RDPPacket rstPacket = RDPPacket.makeRstPacket();
rstPacket.setPort(remotePort);
rstPacket.setInetAddress(remoteAddr);
RDPServer.sendPacket(serverSocket.getDatagramChannel(), rstPacket);
return;
}
// it is a syn packet, lets make a new connection for it
RDPConnection con = new RDPConnection();
DatagramChannel dc = serverSocket.getDatagramChannel();
con.initConnection(dc, packet);
// add new connection to allConnectionMap
registerConnection(con, dc);
// ack it with a syn
RDPPacket synPacket = RDPPacket.makeSynPacket(con);
con.sendPacketImmediate(synPacket, false);
}
/** returns a list of rdpserversockets */
Set<DatagramChannel> getActiveChannels() throws InterruptedException, java.io.IOException {
lock.lock();
try {
while (channelMap.isEmpty()) {
channelMapNotEmpty.await();
}
} finally {
lock.unlock();
}
Set<SelectionKey> readyKeys = null;
do {
lock.lock();
try {
if (!newChannelSet.isEmpty()) {
if (Log.loggingNet) Log.net("RDPServer.getActiveChannels: newChannelSet is not null");
Iterator<DatagramChannel> iter = newChannelSet.iterator();
while (iter.hasNext()) {
DatagramChannel newDC = iter.next();
iter.remove();
newDC.register(selector, SelectionKey.OP_READ);
}
}
} finally {
lock.unlock();
}
int numReady = selector.select(); // this is a blocking call - thread safe
selectCalls++;
if (numReady == 0) {
if (Log.loggingNet) Log.net("RDPServer.getActiveChannels: selector returned 0");
continue;
}
readyKeys = selector.selectedKeys();
if (Log.loggingNet)
Log.net(
"RDPServer.getActiveChannels: called select - # of ready keys = "
+ readyKeys.size()
+ " == "
+ numReady);
} while (readyKeys == null || readyKeys.isEmpty());
lock.lock();
try {
// get a datagramchannel that is ready
Set<DatagramChannel> activeChannels = new HashSet<DatagramChannel>();
Iterator<SelectionKey> iter = readyKeys.iterator();
while (iter.hasNext()) {
SelectionKey key = iter.next();
if (Log.loggingNet)
Log.net(
"RDPServer.getActiveChannels: matched selectionkey: "
+ key
+ ", isAcceptable="
+ key.isAcceptable()
+ ", isReadable="
+ key.isReadable()
+ ", isValid="
+ key.isValid()
+ ", isWritable="
+ key.isWritable());
iter.remove(); // remove from the selected key list
if (!key.isReadable() || !key.isValid()) {
Log.error(
"RDPServer.getActiveChannels: Throwing exception: RDPServer: not readable or invalid");
throw new MVRuntimeException("RDPServer: not readable or invalid");
}
DatagramChannel dc = (DatagramChannel) key.channel();
activeChannels.add(dc);
}
if (Log.loggingNet)
Log.net(
"RDPServer.getActiveChannels: returning " + activeChannels.size() + " active channels");
return activeChannels;
} finally {
lock.unlock();
}
}
/**
* returns the RDPConnection that is registered for the given datagram channel and is connected to
* the host/port in ConnectionInfo returns null if there is no matching registered rdpconnection
*/
static RDPConnection getConnection(DatagramChannel dc, ConnectionInfo conInfo) {
lock.lock();
try {
Map<ConnectionInfo, RDPConnection> dcConMap = allConMap.get(dc);
if (dcConMap == null) {
// there isnt even a datagram associated
if (Log.loggingNet) Log.net("RDPServer.getConnection: could not find datagram");
return null;
}
return dcConMap.get(conInfo);
} finally {
lock.unlock();
}
}
static Set<RDPConnection> getAllConnections() {
lock.lock();
try {
Set<RDPConnection> allCon = new HashSet<RDPConnection>();
Iterator<Map<ConnectionInfo, RDPConnection>> iter = allConMap.values().iterator();
while (iter.hasNext()) {
Map<ConnectionInfo, RDPConnection> dcMap = iter.next();
allCon.addAll(dcMap.values());
}
return allCon;
} finally {
lock.unlock();
}
}
/**
* returns the RDPServerSocket that is registered for the given datagramchannel returns null if
* none exists
*/
static RDPServerSocket getRDPSocket(DatagramChannel dc) {
lock.lock();
try {
return socketMap.get(dc);
} finally {
lock.unlock();
}
}
static CountMeter packetCounter = new CountMeter("RDPPacketReceiveCounter");
static CountMeter dataCounter = new CountMeter("RDPPacketReceiveDATA");
/**
* we have a packet that belongs to the passed in connection. process the packet for the
* connection. It returns true if the connection is open and the packet was a data packet
*/
boolean processExistingConnection(RDPConnection con, RDPPacket packet) {
if (Log.loggingNet)
Log.net("RDPServer.processExistingConnection: con state=" + con + ", packet=" + packet);
packetCounter.add();
int state = con.getState();
if (state == RDPConnection.LISTEN) {
// something is wrong, we shouldn't be here
// we get to this method after looking in the connections map
// but all LISTEN connections should be listed direct
// from serversockets
Log.error("RDPServer.processExistingConnection: connection shouldnt be in LISTEN state");
return false;
}
if (state == RDPConnection.SYN_SENT) {
if (!packet.isAck()) {
Log.warn("got a non-ack packet when we're in SYN_SENT");
return false;
}
if (!packet.isSyn()) {
Log.warn("got a non-syn packet when we're in SYN_SENT");
return false;
}
if (Log.loggingNet) Log.net("good: got syn-ack packet in syn_sent");
// make sure its acking our initial segment #
if (packet.getAckNum() != con.getInitialSendSeqNum()) {
if (Log.loggingNet) Log.net("syn's ack number does not match initial seq #");
return false;
}
con.setRcvCur(packet.getSeqNum());
con.setRcvIrs(packet.getSeqNum());
con.setMaxSendUnacks(packet.getSendUnacks());
con.setMaxReceiveSegmentSize(packet.getMaxRcvSegmentSize());
con.setSendUnackd(packet.getAckNum() + 1);
// ack first before setting state to open
// otherwise some other thread will get woken up and send data
// before we send the ack
if (Log.loggingNet) Log.net("new connection state: " + con);
RDPPacket replyPacket = new RDPPacket(con);
con.sendPacketImmediate(replyPacket, false);
con.setState(RDPConnection.OPEN);
return false;
}
if (state == RDPConnection.SYN_RCVD) {
if (packet.getSeqNum() <= con.getRcvIrs()) {
Log.error("seqnum is not above rcv initial seq num");
return false;
}
if (packet.getSeqNum() > (con.getRcvCur() + (con.getRcvMax() * 2))) {
Log.error("seqnum is too big");
return false;
}
if (packet.isAck()) {
if (packet.getAckNum() == con.getInitialSendSeqNum()) {
if (Log.loggingNet) Log.net("got ack for our syn - setting state to open");
con.setState(RDPConnection.OPEN); // this will notify()
// call the accept callback
// first find the serversocket
DatagramChannel dc = con.getDatagramChannel();
if (dc == null) {
throw new MVRuntimeException(
"RDPServer.processExistingConnection: no datagramchannel for connection that just turned OPEN");
}
RDPServerSocket rdpSocket = RDPServer.getRDPSocket(dc);
if (rdpSocket == null) {
throw new MVRuntimeException(
"RDPServer.processExistingConnection: no socket for connection that just turned OPEN");
}
ClientConnection.AcceptCallback acceptCB = rdpSocket.getAcceptCallback();
if (acceptCB != null) {
acceptCB.acceptConnection(con);
} else {
Log.warn("serversocket has no accept callback");
}
if (Log.loggingNet)
Log.net(
"RDPServer.processExistingConnection: got ACK, removing from unack list: "
+ packet.getSeqNum());
con.removeUnackPacket(packet.getSeqNum());
}
}
}
if (state == RDPConnection.CLOSE_WAIT) {
// reply with a reset on all packets
if (!packet.isRst()) {
RDPPacket rstPacket = RDPPacket.makeRstPacket();
con.sendPacketImmediate(rstPacket, false);
}
}
if (state == RDPConnection.OPEN) {
if (packet.isRst()) {
// the other side wants to close the connection
// set the state,
// dont call con.close() since that will send a reset packet
if (Log.loggingDebug)
Log.debug("RDPServer.processExistingConnection: got reset packet for con " + con);
if (con.getState() != RDPConnection.CLOSE_WAIT) {
con.setState(RDPConnection.CLOSE_WAIT);
con.setCloseWaitTimer();
// Only invoke callback when moving into CLOSE_WAIT
// state. This prevents two calls to connectionReset.
Log.net("RDPServer.processExistingConnection: calling reset callback");
ClientConnection.MessageCallback pcb = con.getCallback();
pcb.connectionReset(con);
}
return false;
}
if (packet.isSyn()) {
// this will close the connection (put into CLOSE_WAIT)
// send a reset packet and call the connectionReset callback
Log.error(
"RDPServer.processExistingConnection: closing connection because we got a syn packet, con="
+ con);
con.close();
return false;
}
// TODO: shouldnt it be ok for it to have same seq num?
// if it is a 0 data packet?
long rcvCur = con.getRcvCur();
if (packet.getSeqNum() <= rcvCur) {
if (Log.loggingNet)
Log.net("RDPServer.processExistingConnection: seqnum too small - acking/not process");
if (packet.getData() != null) {
if (Log.loggingNet)
Log.net(
"RDPServer.processExistingConnection: sending ack even though seqnum out of range");
RDPPacket replyPacket = new RDPPacket(con);
con.sendPacketImmediate(replyPacket, false);
}
return false;
}
if (packet.getSeqNum() > (rcvCur + (con.getRcvMax() * 2))) {
Log.error("RDPServer.processExistingConnection: seqnum too big - discarding");
return false;
}
if (packet.isAck()) {
if (Log.loggingNet)
Log.net("RDPServer.processExistingConnection: processing ack " + packet.getAckNum());
// lock for race condition (read then set)
con.getLock().lock();
try {
if (packet.getAckNum() >= con.getSendNextSeqNum()) {
// acking something we didnt even send yet
Log.error(
"RDPServer.processExistingConnection: discarding -- got ack #"
+ packet.getAckNum()
+ ", but our next send seqnum is "
+ con.getSendNextSeqNum()
+ " -- "
+ con);
return false;
}
if (con.getSendUnackd() <= packet.getAckNum()) {
con.setSendUnackd(packet.getAckNum() + 1);
if (Log.loggingNet)
Log.net(
"RDPServer.processExistingConnection: updated send_unackd num to "
+ con.getSendUnackd()
+ " (one greater than packet ack) - "
+ con);
con.removeUnackPacketUpTo(packet.getAckNum());
}
if (packet.isEak()) {
List eackList = packet.getEackList();
Iterator iter = eackList.iterator();
while (iter.hasNext()) {
Long seqNum = (Long) iter.next();
if (Log.loggingNet)
Log.net("RDPServer.processExistingConnection: got EACK: " + seqNum);
con.removeUnackPacket(seqNum.longValue());
}
}
} finally {
con.getLock().unlock();
if (Log.loggingNet)
Log.net("RDPServer.processExistingConnection: processed ack " + packet.getAckNum());
}
}
// process the data
byte[] data = packet.getData();
if ((data != null) || packet.isNul()) {
dataCounter.add();
// lock - since racecondition: we read then set
con.getLock().lock();
try {
rcvCur = con.getRcvCur(); // update rcvCur
if (Log.loggingNet) Log.net("RDPServer.processExistingConnection: rcvcur is " + rcvCur);
ClientConnection.MessageCallback pcb = con.getCallback();
if (pcb == null) {
Log.warn("RDPServer.processExistingConnection: no packet callback registered");
}
// call callback only if we havent seen it already - eackd
if (!con.hasEack(packet.getSeqNum())) {
if (con.isSequenced()) {
// this is a sequential connection,
// make sure this is the 'next' packet
// is this the next sequential packet
if (packet.getSeqNum() == (rcvCur + 1)) {
// this is the next packet
if (Log.loggingNet)
Log.net(
"RDPServer.processExistingConnection: conn is sequenced and received next packet, rcvCur="
+ rcvCur
+ ", packet="
+ packet);
if ((pcb != null) && (data != null)) {
queueForCallbackProcessing(pcb, con, packet);
}
} else {
// not the next packet, place it in queue
if (Log.loggingNet)
Log.net(
"RDPServer.processExistingConnection: conn is sequenced, BUT PACKET is OUT OF ORDER: rcvcur="
+ rcvCur
+ ", packet="
+ packet);
con.addSequencePacket(packet);
}
} else {
if ((pcb != null) && (data != null)) {
// make sure we havent already processed packet
queueForCallbackProcessing(pcb, con, packet);
}
}
} else {
if (Log.loggingNet) Log.net(con.toString() + " already seen this packet");
}
// is this the next sequential packet
if (packet.getSeqNum() == (rcvCur + 1)) {
con.setRcvCur(rcvCur + 1);
if (Log.loggingNet)
Log.net(
"RDPServer.processExistingConnection RCVD: incremented last sequenced rcvd: "
+ (rcvCur + 1));
// packet in order - dont add to eack
// Take any additional sequential packets off eack
long seqNum = rcvCur + 2;
while (con.removeEack(seqNum)) {
if (Log.loggingNet)
Log.net("RDPServer.processExistingConnection: removing/collapsing eack: " + seqNum);
con.setRcvCur(seqNum++);
}
if (con.isSequenced()) {
rcvCur++; // since we just process the last one
Log.net(
"RDPServer.processExistingConnection: connection is sequenced, processing collapsed packets.");
// send any saved sequential packets also
Iterator iter = con.getSequencePackets().iterator();
while (iter.hasNext()) {
RDPPacket p = (RDPPacket) iter.next();
if (Log.loggingNet)
Log.net(
"rdpserver: stored packet seqnum="
+ p.getSeqNum()
+ ", if equal to (rcvcur + 1)="
+ (rcvCur + 1));
if (p.getSeqNum() == (rcvCur + 1)) {
Log.net(
"RDPServer.processExistingConnection: this is the next packet, processing");
// this is the next packet - update rcvcur
rcvCur++;
// process this packet
Log.net(
"RDPServer.processExistingConnection: processing stored sequential packet "
+ p);
byte[] storedData = p.getData();
if (pcb != null && storedData != null) {
queueForCallbackProcessing(pcb, con, packet);
}
iter.remove();
}
}
} else {
if (Log.loggingNet)
Log.net("RDPServer.processExistingConnection: connection is not sequenced");
}
} else {
if (Log.loggingNet)
Log.net(
"RDPServer.processExistingConnection: RCVD OUT OF ORDER: packet seq#: "
+ packet.getSeqNum()
+ ", but last sequential rcvd packet was: "
+ con.getRcvCur()
+ " -- not incrementing counter");
if (packet.getSeqNum() > rcvCur) {
// must be at least + 2 larger than rcvCur
if (Log.loggingNet) Log.net("adding to eack list " + packet);
con.addEack(packet);
}
}
} finally {
con.getLock().unlock();
}
return true;
}
}
return false;
}
/** reads in an rdp packet from the datagram channel - blocking call */
static RDPPacket receivePacket(DatagramChannel dc) throws ClosedChannelException {
try {
if (dc == null) {
throw new MVRuntimeException("RDPServer.receivePacket: datagramChannel is null");
}
// get a packet from the reader
staticMVBuff.rewind();
InetSocketAddress addr = (InetSocketAddress) dc.receive(staticMVBuff.getNioBuf());
if (addr == null) {
return null;
}
RDPPacket packet = new RDPPacket();
packet.setPort(addr.getPort());
packet.setInetAddress(addr.getAddress());
packet.parse(staticMVBuff);
return packet;
} catch (ClosedChannelException ex) {
throw ex;
} catch (Exception e) {
throw new MVRuntimeException("error", e);
}
}
// Only used by receivePacket, which is guaranteed to be single-threaded.
private static MVByteBuffer staticMVBuff =
new MVByteBuffer(RDPConnection.DefaultMaxReceiveSegmentSize);
static String printSocket(DatagramSocket socket) {
return "[Socket: localPort="
+ socket.getLocalPort()
+ ", remoteAddr="
+ socket.getInetAddress()
+ ", localAddr="
+ socket.getLocalAddress()
+ "]";
}
static CountMeter sendMeter = new CountMeter("RDPSendPacketMeter");
static CountMeter sendDataMeter = new CountMeter("RDPSendDataPacketMeter");
/** make sure the packet as the remote address and remote port set */
static void sendPacket(DatagramChannel dc, RDPPacket packet) {
sendMeter.add();
// allocate a buffer
int bufSize = 100 + (packet.numEacks() * 4);
if (packet.getData() != null) {
bufSize += packet.getData().length;
sendDataMeter.add();
}
MVByteBuffer buf = new MVByteBuffer(bufSize);
packet.toByteBuffer(buf); // function flips the buffer
int remotePort = packet.getPort();
InetAddress remoteAddr = packet.getInetAddress();
if ((remotePort < 0) || (remoteAddr == null)) {
throw new MVRuntimeException("RDPServer.sendPacket: remotePort or addr is null");
}
try {
int bytes = dc.send(buf.getNioBuf(), new InetSocketAddress(remoteAddr, remotePort));
if (bytes == 0) {
Log.error("RDPServer.sendPacket: could not send packet, size=" + bufSize);
}
if (Log.loggingNet)
Log.net(
"RDPServer.sendPacket: remoteAddr="
+ remoteAddr
+ ", remotePort="
+ remotePort
+ ", numbytes sent="
+ bytes);
} catch (java.io.IOException e) {
Log.exception(
"RDPServer.sendPacket: remoteAddr="
+ remoteAddr
+ ", remotePort="
+ remotePort
+ ", got exception",
e);
throw new MVRuntimeException("RDPServer.sendPacket", e);
}
}
// ////////////////////////////////////////
//
// Private Fields
//
// use 'rdpServer' object as static lock - including for bindmap
// and connectionMap
static RDPServer rdpServer = new RDPServer();
// localport -> datagramchannel for that port
private static Map<Integer, DatagramChannel> channelMap = new HashMap<Integer, DatagramChannel>();
// maps datagramchannel to serversocket
// so when we get a new packet on a datagram channel via select() we can
// associate it with a server socket and thus its callback
private static Map<DatagramChannel, RDPServerSocket> socketMap =
new HashMap<DatagramChannel, RDPServerSocket>();
// map of datagram channel to a secondary map of connectioninfo->connection
// when we get a packet, we check if it is associated with an existing
// connection. but there can be many connections associated with a
// single datagramchannel (localport), so we first look up by
// datagram channel and then that returns us a second map.
// we key into the connectioninfo (which makes a connection unique -
// (localport, remoteport, remoteaddr) and then get the single connection
private static Map<DatagramChannel, Map<ConnectionInfo, RDPConnection>> allConMap =
new HashMap<DatagramChannel, Map<ConnectionInfo, RDPConnection>>();
private static Lock unsentPacketsLock = LockFactory.makeLock("unsentPacketsLock");
static Condition unsentPacketsNotEmpty = unsentPacketsLock.newCondition();
/** set of new datagram channels that need to be registered with the selector */
static Set<DatagramChannel> newChannelSet = new HashSet<DatagramChannel>();
// thread that reads in new packets
static Thread rdpServerThread = null;
static Thread retryThread = null;
static Thread packetCallbackThread = null;
// // list of datagramchannels for sockets that are dead and should be
// removed
// // they became dead when the other side of the connection went away
// // in the case of a single user connections
// static List<DatagramChannel> deadDatagramChannelList =
// new LinkedList<DatagramChannel>();
static Selector selector = null;
private static boolean rdpServerStarted = false;
public static void startRDPServer() {
if (rdpServerStarted) return;
rdpServerStarted = true;
rdpServerThread = new Thread(rdpServer, "RDPServer");
retryThread = new Thread(new RetryThread(), "RDPRetry");
packetCallbackThread = new Thread(new PacketCallbackThread(), "RDPCallback");
if (Log.loggingNet) Log.net("static - starting rdpserver thread");
try {
selector = Selector.open();
} catch (Exception e) {
Log.exception("RDPServer caught exception opening selector", e);
System.exit(1);
}
rdpServerThread.setPriority(rdpServerThread.getPriority() + 2);
if (Log.loggingDebug)
Log.debug(
"RDPServer: starting rdpServerThread with priority " + rdpServerThread.getPriority());
rdpServerThread.start();
retryThread.start();
packetCallbackThread.start();
}
// used in the TreeSet of connections with pending packets
// it has time data associated with the connection, telling us
// when we need to re-visit this connection to send its pending
// data, in case it was not able to send all of its packets
// due to throttling
static class RDPConnectionData implements Comparable {
public RDPConnection con;
public long readyTime;
public int compareTo(Object arg0) {
RDPConnectionData other = (RDPConnectionData) arg0;
if (this.readyTime < other.readyTime) {
if (Log.loggingNet)
Log.net(
"RDPServer.RDPConnectionData.compareTo: readyTime compare -1: thiscon="
+ this.con
+ ", othercon="
+ other.con
+ ", thisready="
+ this.readyTime
+ ", otherReady="
+ other.readyTime);
return -1;
} else if (this.readyTime > other.readyTime) {
if (Log.loggingNet)
Log.net(
"RDPServer.RDPConnectionData.compareTo: readyTime compare 1: thiscon="
+ this.con
+ ", othercon="
+ other.con
+ ", thisready="
+ this.readyTime
+ ", otherReady="
+ other.readyTime);
return 1;
}
if (this.con == other.con) {
if (Log.loggingNet)
Log.net(
"RDPServer.RDPConnectionData.compareTo: conRef compare 0: thiscon="
+ this.con
+ ", othercon="
+ other.con);
return 0;
} else if (this.con.hashCode() < other.con.hashCode()) {
if (Log.loggingNet)
Log.net(
"RDPServer.RDPConnectionData.compareTo: hashCode compare -1: thiscon="
+ this.con
+ ", othercon="
+ other.con);
return -1;
} else if (this.con.hashCode() > other.con.hashCode()) {
if (Log.loggingNet)
Log.net(
"RDPServer.RDPConnectionData.compareTo: hashCode compare 1: thiscon="
+ this.con
+ ", othercon="
+ other.con);
return 1;
} else {
throw new RuntimeException("error");
}
}
public boolean equals(Object obj) {
int rv = this.compareTo(obj);
if (Log.loggingNet)
Log.net(
"RDPServer.RDPConnectionData.equals: thisObj="
+ this.toString()
+ ", other="
+ obj.toString()
+ ", result="
+ rv);
return (rv == 0);
}
}
// //////////////////////////////////////////////////
//
// RETRY THREAD - also handles CLOSE_WAIT connections - to actually close
// them
//
static class RetryThread implements Runnable {
public RetryThread() {}
public void run() {
// every second, go through all the packets that havent been
// ack'd
List<RDPConnection> conList = new LinkedList<RDPConnection>();
long lastCounterTime = System.currentTimeMillis();
while (true) {
try {
long startTime = System.currentTimeMillis();
long interval = startTime - lastCounterTime;
if (interval > 1000) {
if (Log.loggingNet) {
Log.net(
"RDPServer counters: activeChannelCalls "
+ activeChannelCalls
+ ", selectCalls "
+ selectCalls
+ ", transmits "
+ transmits
+ ", retransmits "
+ retransmits
+ " in "
+ interval
+ "ms");
}
activeChannelCalls = 0;
selectCalls = 0;
transmits = 0;
retransmits = 0;
lastCounterTime = startTime;
}
if (Log.loggingNet) Log.net("RDPServer.RETRY: startTime=" + startTime);
// go through all the rdpconnections and re-send any
// unacked packets
conList.clear();
lock.lock();
try {
// make a copy since the values() collection is
// backed by the map
Set<RDPConnection> conCol = RDPServer.getAllConnections();
if (conCol == null) {
throw new MVRuntimeException("values() returned null");
}
conList.addAll(conCol); // make non map backed copy
} finally {
lock.unlock();
}
Iterator<RDPConnection> iter = conList.iterator();
while (iter.hasNext()) {
RDPConnection con = iter.next();
long currentTime = System.currentTimeMillis();
// is the connection in CLOSE_WAIT
if (con.getState() == RDPConnection.CLOSE_WAIT) {
long closeTime = con.getCloseWaitTimer();
long elapsedTime = currentTime - closeTime;
Log.net(
"RDPRetryThread: con is in CLOSE_WAIT: elapsed close timer(ms)="
+ elapsedTime
+ ", waiting for 30seconds to elapse. con="
+ con);
if (elapsedTime > 30000) {
// close the connection
Log.net("RDPRetryThread: removing CLOSE_WAIT connection. con=" + con);
removeConnection(con);
} else {
Log.net(
"RDPRetryThread: time left on CLOSE_WAIT timer: "
+ (30000 - (currentTime - closeTime)));
}
// con.close();
continue;
}
if (Log.loggingNet)
Log.net(
"RDPServer.RETRY: resending expired packets "
+ con
+ " - current list size = "
+ con.unackListSize());
// see if we should send a null packet, but only if con is already open
if ((con.getState() == RDPConnection.OPEN)
&& ((currentTime - con.getLastNullPacketTime()) > 30000)) {
con.getLock().lock();
try {
RDPPacket nulPacket = RDPPacket.makeNulPacket();
con.sendPacketImmediate(nulPacket, false);
con.setLastNullPacketTime();
if (Log.loggingNet) Log.net("RDPServer.retry: sent nul packet: " + nulPacket);
} finally {
con.getLock().unlock();
}
} else {
if (Log.loggingNet)
Log.net(
"RDPServer.retry: sending nul packet in "
+ (30000 - (currentTime - con.getLastNullPacketTime())));
}
con.resend(
currentTime - resendTimerMS, // resend cutoff time
currentTime - resendTimeoutMS); // giveup time
}
long endTime = System.currentTimeMillis();
if (Log.loggingNet)
Log.net(
"RDPServer.RETRY: endTime=" + endTime + ", elapse(ms)=" + (endTime - startTime));
Thread.sleep(250);
} catch (Exception e) {
Log.exception("RDPServer.RetryThread.run caught exception", e);
}
}
}
}
static Lock lock = LockFactory.makeLock("StaticRDPServerLock");
/**
* this condition gets signalled when there is a new server socket. this is useful when you are
* waiting to process a new connection
*/
static Condition channelMapNotEmpty = lock.newCondition();
// private MVLock lock = new MVLock("RDPServerLock");
/**
* maximum time (in milliseconds) a packet can be in the resend queue before the connection closes
* itself - defaults to 30 seconds
*/
public static int resendTimeoutMS = 30000;
/** how often we resend packets */
public static int resendTimerMS = 500;
public static void setCounterLogging(boolean enable) {
packetCounter.setLogging(enable);
dataCounter.setLogging(enable);
sendMeter.setLogging(enable);
sendDataMeter.setLogging(enable);
RDPConnection.resendMeter.setLogging(enable);
}
/** machinery to count select and active channel calls */
public static int activeChannelCalls = 0;
public static int selectCalls = 0;
public static int transmits = 0;
public static int retransmits = 0;
// this is the worker thread which calls the callback
// we want it in a seperate thread so it doesnt block
// the rdpserver connections. Currently unused.
static class CallbackThread implements Runnable {
CallbackThread(RDPPacketCallback cb, RDPConnection con, RDPPacket packet, MVByteBuffer buf) {
this.cb = cb;
this.con = con;
this.packet = packet;
this.buf = buf;
}
public void run() {
cb.processPacket(con, buf);
}
RDPConnection con = null;
RDPPacketCallback cb = null;
RDPPacket packet = null;
MVByteBuffer buf = null;
}
/**
* Machinery to process a queue of packets that have been received but not yet subjected to packet
* processing.
*/
static class PacketCallbackStruct {
PacketCallbackStruct(
ClientConnection.MessageCallback cb, ClientConnection con, RDPPacket packet) {
this.cb = cb;
this.con = con;
this.packet = packet;
}
ClientConnection con = null;
ClientConnection.MessageCallback cb = null;
RDPPacket packet = null;
}
static void queueForCallbackProcessing(
ClientConnection.MessageCallback pcb, ClientConnection con, RDPPacket packet) {
queuedPacketCallbacksLock.lock();
try {
queuedPacketCallbacks.addLast(new PacketCallbackStruct(pcb, con, packet));
queuedPacketCallbacksNotEmpty.signal();
} finally {
queuedPacketCallbacksLock.unlock();
}
}
static LinkedList<PacketCallbackStruct> queuedPacketCallbacks =
new LinkedList<PacketCallbackStruct>();
static Lock queuedPacketCallbacksLock = LockFactory.makeLock("queuedPacketCallbacksLock");
static Condition queuedPacketCallbacksNotEmpty = queuedPacketCallbacksLock.newCondition();
// this is the worker thread that processes the queue of packets
// received but not yet subjected to callback processing.
static class PacketCallbackThread implements Runnable {
PacketCallbackThread() {}
public void run() {
while (true) {
LinkedList<PacketCallbackStruct> list = null;
try {
queuedPacketCallbacksLock.lock();
try {
queuedPacketCallbacksNotEmpty.await();
} catch (Exception e) {
Log.error(
"RDPServer.PacketCallbackThread: queuedPacketCallbacksNotEmpty.await() caught exception "
+ e.getMessage());
}
list = queuedPacketCallbacks;
queuedPacketCallbacks = new LinkedList<PacketCallbackStruct>();
} finally {
queuedPacketCallbacksLock.unlock();
}
if (Log.loggingNet)
Log.net("RDPServer.PacketCallbackThread: Got " + list.size() + " queued packets");
for (PacketCallbackStruct pcs : list) {
try {
callbackProcessPacket(pcs.cb, pcs.con, pcs.packet);
} catch (Exception e) {
Log.exception("RDPServer.PacketCallbackThread: ", e);
}
}
}
}
}
static void callbackProcessPacket(
ClientConnection.MessageCallback pcb, ClientConnection clientCon, RDPPacket packet) {
if (packet.isNul()) {
return;
}
byte[] data = packet.getData();
MVByteBuffer buf = new MVByteBuffer(data);
RDPConnection con = (RDPConnection) clientCon;
// If this is a multiple-message message . . .
if (buf.getLong() == -1 && buf.getInt() == RDPConnection.aggregatedMsgId) {
con.aggregatedReceives++;
PacketAggregator.allAggregatedReceives++;
// Get the count of sub buffers
int size = buf.getInt();
con.receivedMessagesAggregated += size;
PacketAggregator.allReceivedMessagesAggregated += size;
if (Log.loggingNet)
Log.net(
"RDPServer.callbackProcessPacket: processing aggregated message with "
+ size
+ " submessages");
MVByteBuffer subBuf = null;
for (int i = 0; i < size; i++) {
try {
subBuf = buf.getByteBuffer();
} catch (Exception e) {
Log.error("In CallbackThread, error getting aggregated subbuffer: " + e.getMessage());
}
if (subBuf != null) pcb.processPacket(con, subBuf);
}
} else {
con.unaggregatedReceives++;
PacketAggregator.allUnaggregatedReceives++;
buf.rewind();
pcb.processPacket(con, buf);
}
}
}