protected int sendBind(DHTTransportContact target) {
try {
Map request = new HashMap();
request.put("type", new Long(RT_BIND_REQUEST));
Map response = sendRequest(target, request, TRANSFER_TIMEOUT);
if (response == null) {
return (RESP_FAILED);
}
if (((Long) response.get("type")).intValue() == RT_BIND_REPLY) {
int result = ((Long) response.get("ok")).intValue();
trace("received bind reply: " + (result == 0 ? "failed" : "ok"));
if (result == 1) {
return (RESP_OK);
}
}
return (RESP_NOT_OK);
} catch (Throwable e) {
log(e);
return (RESP_FAILED);
}
}
protected void receiveQuery(DHTTransportUDPContact originator, Map request, Map response) {
trace("received query request");
InetSocketAddress address = originator.getTransportAddress();
response.put("ip", address.getAddress().getHostAddress().getBytes());
response.put("port", new Long(address.getPort()));
response.put("ok", new Long(1));
}
public void destroy() {
try {
server_mon.enter();
Iterator it = rendezvous_bindings.values().iterator();
while (it.hasNext()) {
Object[] entry = (Object[]) it.next();
final DHTTransportUDPContact contact = (DHTTransportUDPContact) entry[0];
new AEThread2("DHTNATPuncher:destroy", true) {
public void run() {
sendClose(contact);
}
}.start();
}
} catch (Throwable e) {
log(e);
} finally {
server_mon.exit();
}
}
protected Map sendConnect(
DHTTransportContact target, DHTTransportContact originator, Map originator_client_data) {
try {
Map request = new HashMap();
request.put("type", new Long(RT_CONNECT_REQUEST));
request.put("origin", encodeContact(originator));
request.put(
"port", new Long(((DHTTransportUDPContact) originator).getTransportAddress().getPort()));
if (originator_client_data != null) {
request.put("client_data", originator_client_data);
}
Map response = sendRequest(target, request, TRANSFER_TIMEOUT);
if (response == null) {
return (null);
}
if (((Long) response.get("type")).intValue() == RT_CONNECT_REPLY) {
int result = ((Long) response.get("ok")).intValue();
trace("received connect reply: " + (result == 0 ? "failed" : "ok"));
if (result == 1) {
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);
}
}
public void setRendezvous(DHTTransportContact target, DHTTransportContact rendezvous) {
explicit_rendezvous_map.put(target.getAddress(), rendezvous);
if (target.getAddress().equals(dht.getTransport().getLocalContact().getAddress())) {
publish(true);
}
}
protected boolean sendTunnelOutbound(DHTTransportContact target) {
log("Sending tunnel outbound message to " + target.getString());
try {
Map message = new HashMap();
message.put("type", new Long(RT_TUNNEL_OUTBOUND));
return (sendTunnelMessage(target, message));
} catch (Throwable e) {
log(e);
return (false);
}
}
protected void receiveBind(DHTTransportUDPContact originator, Map request, Map response) {
trace("received bind request");
boolean ok = true;
boolean log = true;
try {
server_mon.enter();
Object[] entry = (Object[]) rendezvous_bindings.get(originator.getAddress().toString());
if (entry == null) {
if (rendezvous_bindings.size() == RENDEZVOUS_SERVER_MAX) {
ok = false;
}
} else {
// already present, no need to log again
log = false;
}
if (ok) {
long now = plugin_interface.getUtilities().getCurrentSystemTime();
rendezvous_bindings.put(
originator.getAddress().toString(), new Object[] {originator, new Long(now)});
response.put("port", new Long(originator.getAddress().getPort()));
}
} finally {
server_mon.exit();
}
if (log) {
log("Rendezvous request from " + originator.getString() + " " + (ok ? "accepted" : "denied"));
}
response.put("ok", new Long(ok ? 1 : 0));
}
protected void rendezvousFailed(DHTTransportContact current_target, boolean tidy) {
log("Rendezvous " + (tidy ? "closed" : "failed") + ": " + current_target.getString());
try {
pub_mon.enter();
failed_rendezvous.put(current_target.getAddress(), "");
} finally {
pub_mon.exit();
}
publish(true);
}
protected void receiveClose(DHTTransportUDPContact originator, Map request, Map response) {
trace("received close request");
final DHTTransportContact current_target = rendezvous_target;
if (current_target != null && Arrays.equals(current_target.getID(), originator.getID())) {
new AEThread2("DHTNATPuncher:close", true) {
public void run() {
rendezvousFailed(current_target, true);
}
}.start();
}
response.put("ok", new Long(1));
}
protected void receivePunch(DHTTransportUDPContact originator, Map request, Map response) {
trace("received punch request");
boolean ok = false;
String target_str = new String((byte[]) request.get("target"));
Object[] entry;
try {
server_mon.enter();
entry = (Object[]) rendezvous_bindings.get(target_str);
} finally {
server_mon.exit();
}
if (entry != null) {
DHTTransportUDPContact target = (DHTTransportUDPContact) entry[0];
Map target_client_data = sendConnect(target, originator, (Map) request.get("client_data"));
if (target_client_data != null) {
response.put("client_data", target_client_data);
response.put("port", new Long(target.getTransportAddress().getPort()));
ok = true;
}
}
log(
"Rendezvous punch request from "
+ originator.getString()
+ " to "
+ target_str
+ " "
+ (ok ? "initiated" : "failed"));
response.put("ok", new Long(ok ? 1 : 0));
}
protected Map receiveRequest(DHTTransportUDPContact originator, Map data) {
int type = ((Long) data.get("type")).intValue();
Map response = new HashMap();
switch (type) {
case RT_BIND_REQUEST:
{
response.put("type", new Long(RT_BIND_REPLY));
receiveBind(originator, data, response);
break;
}
case RT_CLOSE_REQUEST:
{
response.put("type", new Long(RT_CLOSE_REPLY));
receiveClose(originator, data, response);
break;
}
case RT_QUERY_REQUEST:
{
response.put("type", new Long(RT_QUERY_REPLY));
receiveQuery(originator, data, response);
break;
}
case RT_PUNCH_REQUEST:
{
response.put("type", new Long(RT_PUNCH_REPLY));
receivePunch(originator, data, response);
break;
}
case RT_CONNECT_REQUEST:
{
response.put("type", new Long(RT_CONNECT_REPLY));
receiveConnect(originator, data, response);
break;
}
case RT_TUNNEL_INBOUND:
{
receiveTunnelInbound(originator, data);
response = null;
break;
}
case RT_TUNNEL_OUTBOUND:
{
receiveTunnelOutbound(originator, data);
response = null;
break;
}
default:
{
response = null;
break;
}
}
return (response);
}
protected void publishSupport() {
DHTTransport transport = dht.getTransport();
if (TESTING || !transport.isReachable()) {
DHTTransportContact local_contact = transport.getLocalContact();
// see if the rendezvous has failed and therefore we are required to find a new one
boolean force =
rendezvous_target != null
&& failed_rendezvous.containsKey(rendezvous_target.getAddress());
if (rendezvous_local_contact != null && !force) {
if (local_contact.getAddress().equals(rendezvous_local_contact.getAddress())) {
// already running for the current local contact
return;
}
}
DHTTransportContact explicit =
(DHTTransportContact) explicit_rendezvous_map.get(local_contact.getAddress());
if (explicit != null) {
try {
pub_mon.enter();
rendezvous_local_contact = local_contact;
rendezvous_target = explicit;
runRendezvous();
} finally {
pub_mon.exit();
}
} else {
final DHTTransportContact[] new_rendezvous_target = {null};
DHTTransportContact[] reachables = dht.getTransport().getReachableContacts();
int reachables_tried = 0;
int reachables_skipped = 0;
final Semaphore sem = plugin_interface.getUtilities().getSemaphore();
for (int i = 0; i < reachables.length; i++) {
DHTTransportContact contact = reachables[i];
try {
pub_mon.enter();
// see if we've found a good one yet
if (new_rendezvous_target[0] != null) {
break;
}
// skip any known bad ones
if (failed_rendezvous.containsKey(contact.getAddress())) {
reachables_skipped++;
sem.release();
continue;
}
} finally {
pub_mon.exit();
}
if (i > 0) {
try {
Thread.sleep(1000);
} catch (Throwable e) {
}
}
reachables_tried++;
contact.sendPing(
new DHTTransportReplyHandlerAdapter() {
public void pingReply(DHTTransportContact ok_contact) {
trace("Punch:" + ok_contact.getString() + " OK");
try {
pub_mon.enter();
if (new_rendezvous_target[0] == null) {
new_rendezvous_target[0] = ok_contact;
}
} finally {
pub_mon.exit();
sem.release();
}
}
public void failed(DHTTransportContact failed_contact, Throwable e) {
try {
trace("Punch:" + failed_contact.getString() + " Failed");
} finally {
sem.release();
}
}
});
}
for (int i = 0; i < reachables.length; i++) {
sem.reserve();
try {
pub_mon.enter();
if (new_rendezvous_target[0] != null) {
rendezvous_target = new_rendezvous_target[0];
rendezvous_local_contact = local_contact;
log(
"Rendezvous found: "
+ rendezvous_local_contact.getString()
+ " -> "
+ rendezvous_target.getString());
runRendezvous();
break;
}
} finally {
pub_mon.exit();
}
}
if (new_rendezvous_target[0] == null) {
log(
"No rendezvous found: candidates="
+ reachables.length
+ ",tried="
+ reachables_tried
+ ",skipped="
+ reachables_skipped);
try {
pub_mon.enter();
rendezvous_local_contact = null;
rendezvous_target = null;
} finally {
pub_mon.exit();
}
}
}
} else {
try {
pub_mon.enter();
rendezvous_local_contact = null;
rendezvous_target = null;
} finally {
pub_mon.exit();
}
}
}
protected DHTTransportContact getRendezvous(String reason, DHTTransportContact target) {
DHTTransportContact explicit =
(DHTTransportContact) explicit_rendezvous_map.get(target.getAddress());
if (explicit != null) {
return (explicit);
}
byte[] key = getPublishKey(target);
final DHTTransportValue[] result_value = {null};
final Semaphore sem = plugin_interface.getUtilities().getSemaphore();
dht.get(
key,
reason + ": lookup for '" + target.getString() + "'",
(byte) 0,
1,
RENDEZVOUS_LOOKUP_TIMEOUT,
false,
true,
new DHTOperationAdapter() {
public void read(DHTTransportContact contact, DHTTransportValue value) {
result_value[0] = value;
sem.release();
}
public void complete(boolean timeout) {
sem.release();
}
});
sem.reserve();
DHTTransportContact result = null;
if (result_value[0] != null) {
byte[] bytes = result_value[0].getValue();
try {
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
DataInputStream dis = new DataInputStream(bais);
byte version = dis.readByte();
if (version != 0) {
throw (new Exception("Unsupported rendezvous version '" + version + "'"));
}
result = dht.getTransport().importContact(dis);
} catch (Throwable e) {
log(e);
}
}
log(
"Lookup of rendezvous for "
+ target.getString()
+ " -> "
+ (result == null ? "None" : result.getString()));
return (result);
}
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));
}
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();
}
}
}
