protected void receiveConnect(DHTTransportContact rendezvous, Map request, Map response) {
trace("received connect request");
boolean ok = false;
// ensure that we've received this from our current rendezvous node
DHTTransportContact rt = rendezvous_target;
if (rt != null && rt.getAddress().equals(rendezvous.getAddress())) {
final DHTTransportUDPContact target = decodeContact((byte[]) request.get("origin"));
if (target != null) {
int transport_port = 0;
Long indirect_port = (Long) request.get("port");
if (indirect_port != null) {
transport_port = indirect_port.intValue();
}
if (transport_port != 0) {
InetSocketAddress existing_address = target.getTransportAddress();
if (transport_port != existing_address.getPort()) {
target.setTransportAddress(
new InetSocketAddress(existing_address.getAddress(), transport_port));
}
}
Map originator_client_data = (Map) request.get("client_data");
boolean no_tunnel = false;
if (originator_client_data == null) {
originator_client_data = new HashMap();
} else {
no_tunnel = originator_client_data.get("_notunnel") != null;
}
if (no_tunnel) {
log("Received message from " + target.getString());
} else {
log("Received connect request from " + target.getString());
// ping the origin a few times to try and establish a tunnel
UTTimerEvent event =
timer.addPeriodicEvent(
3000,
new UTTimerEventPerformer() {
private int pings = 1;
public void perform(UTTimerEvent ev) {
if (pings > 3) {
ev.cancel();
return;
}
pings++;
if (sendTunnelInbound(target)) {
ev.cancel();
}
}
});
if (sendTunnelInbound(target)) {
event.cancel();
}
}
Map client_data =
adapter.getClientData(target.getTransportAddress(), originator_client_data);
if (client_data == null) {
client_data = new HashMap();
}
response.put("client_data", client_data);
ok = true;
} else {
log("Connect request: failed to decode target");
}
} else {
log("Connect request from invalid rendezvous: " + rendezvous.getString());
}
response.put("ok", new Long(ok ? 1 : 0));
}
public void start() {
if (started) {
return;
}
started = true;
DHTTransport transport = dht.getTransport();
transport.addListener(
new DHTTransportListener() {
public void localContactChanged(DHTTransportContact local_contact) {
publish(false);
}
public void currentAddress(String address) {}
public void reachabilityChanged(boolean reacheable) {
publish(false);
}
});
transport.registerTransferHandler(
transfer_handler_key,
new DHTTransportTransferHandler() {
public String getName() {
return ("NAT Traversal");
}
public byte[] handleRead(DHTTransportContact originator, byte[] key) {
return (null);
}
public byte[] handleWrite(DHTTransportContact originator, byte[] key, byte[] value) {
return (receiveRequest((DHTTransportUDPContact) originator, value));
}
});
timer.addPeriodicEvent(
REPUBLISH_TIME_MIN,
new UTTimerEventPerformer() {
public void perform(UTTimerEvent event) {
publish(false);
}
});
timer.addPeriodicEvent(
RENDEZVOUS_SERVER_TIMEOUT / 2,
new UTTimerEventPerformer() {
public void perform(UTTimerEvent event) {
long now = plugin_interface.getUtilities().getCurrentSystemTime();
try {
server_mon.enter();
Iterator it = rendezvous_bindings.values().iterator();
while (it.hasNext()) {
Object[] entry = (Object[]) it.next();
long time = ((Long) entry[1]).longValue();
boolean removed = false;
if (time > now) {
// clock change, easiest approach is to remove it
it.remove();
removed = true;
} else if (now - time > RENDEZVOUS_SERVER_TIMEOUT) {
// timeout
it.remove();
removed = true;
}
if (removed) {
log(
"Rendezvous "
+ ((DHTTransportContact) entry[0]).getString()
+ " removed due to inactivity");
}
}
} finally {
server_mon.exit();
}
}
});
publish(false);
}
protected Map sendPunch(
DHTTransportContact rendezvous,
final DHTTransportUDPContact target,
Map originator_client_data,
boolean no_tunnel) {
AESemaphore wait_sem = new AESemaphore("DHTNatPuncher::sendPunch");
Object[] wait_data = new Object[] {target, wait_sem, new Integer(0)};
try {
try {
punch_mon.enter();
oustanding_punches.add(wait_data);
} finally {
punch_mon.exit();
}
Map request = new HashMap();
request.put("type", new Long(RT_PUNCH_REQUEST));
request.put("target", target.getAddress().toString().getBytes());
if (originator_client_data != null) {
if (no_tunnel) {
originator_client_data.put("_notunnel", new Long(1));
}
request.put("client_data", originator_client_data);
}
// for a message payload (i.e. no_tunnel) we double the initiator timeout to give
// more chance for reasonable size messages to get through as they have to go through
// 2 xfer processes
Map response =
sendRequest(rendezvous, request, no_tunnel ? TRANSFER_TIMEOUT * 2 : TRANSFER_TIMEOUT);
if (response == null) {
return (null);
}
if (((Long) response.get("type")).intValue() == RT_PUNCH_REPLY) {
int result = ((Long) response.get("ok")).intValue();
trace(
"received "
+ (no_tunnel ? "message" : "punch")
+ " reply: "
+ (result == 0 ? "failed" : "ok"));
if (result == 1) {
// pick up port changes from the rendezvous
Long indirect_port = (Long) response.get("port");
if (indirect_port != null) {
int transport_port = indirect_port.intValue();
if (transport_port != 0) {
InetSocketAddress existing_address = target.getTransportAddress();
if (transport_port != existing_address.getPort()) {
target.setTransportAddress(
new InetSocketAddress(existing_address.getAddress(), transport_port));
}
}
}
if (!no_tunnel) {
// ping the target a few times to try and establish a tunnel
UTTimerEvent event =
timer.addPeriodicEvent(
3000,
new UTTimerEventPerformer() {
private int pings = 1;
public void perform(UTTimerEvent event) {
if (pings > 3) {
event.cancel();
return;
}
pings++;
if (sendTunnelOutbound(target)) {
event.cancel();
}
}
});
if (sendTunnelOutbound(target)) {
event.cancel();
}
// give the other end a few seconds to kick off some tunnel events to us
if (wait_sem.reserve(10000)) {
event.cancel();
}
}
// routers often fiddle with the port when not mapped so we need to grab the right one to
// use
// for direct communication
// first priority goes to direct tunnel messages received
int transport_port = 0;
try {
punch_mon.enter();
transport_port = ((Integer) wait_data[2]).intValue();
} finally {
punch_mon.exit();
}
if (transport_port != 0) {
InetSocketAddress existing_address = target.getTransportAddress();
if (transport_port != existing_address.getPort()) {
target.setTransportAddress(
new InetSocketAddress(existing_address.getAddress(), transport_port));
}
}
Map target_client_data = (Map) response.get("client_data");
if (target_client_data == null) {
target_client_data = new HashMap();
}
return (target_client_data);
}
}
return (null);
} catch (Throwable e) {
log(e);
return (null);
} finally {
try {
punch_mon.enter();
oustanding_punches.remove(wait_data);
} finally {
punch_mon.exit();
}
}
}