public long receiveEncrypted(byte encrypted[]) {
TunnelDataMessage msg = new TunnelDataMessage(_context);
msg.setData(encrypted);
msg.setTunnelId(_config.getConfig(0).getSendTunnel());
if (_log.shouldLog(Log.DEBUG))
_log.debug("received encrypted, sending out " + _config + ": " + msg);
RouterInfo ri = _nextHopCache;
if (ri == null) ri = _context.netDb().lookupRouterInfoLocally(_config.getPeer(1));
if (ri != null) {
_nextHopCache = ri;
send(msg, ri);
return msg.getUniqueId();
} else {
// It should be rare to forget the router info for a peer in our own tunnel.
if (_log.shouldLog(Log.WARN))
_log.warn("lookup of " + _config.getPeer(1) + " required for " + msg);
_context
.netDb()
.lookupRouterInfo(
_config.getPeer(1),
new SendJob(_context, msg),
new FailedJob(_context),
MAX_LOOKUP_TIME);
return -1;
}
}
public OutboundReceiver(RouterContext ctx, TunnelCreatorConfig cfg) {
_context = ctx;
_log = ctx.logManager().getLog(OutboundReceiver.class);
_config = cfg;
_nextHopCache = _context.netDb().lookupRouterInfoLocally(_config.getPeer(1));
// all createRateStat() in TunnelDispatcher
}
/** Die a horrible death. Cannot be restarted. */
public synchronized void stopRunning() {
if (_dead) return;
if (_context.router().isAlive() && _log.shouldLog(Log.WARN))
_log.warn(
"Stop the I2CP connection! current leaseSet: " + _currentLeaseSet,
new Exception("Stop client connection"));
_dead = true;
// we need these keys to unpublish the leaseSet
if (_reader != null) _reader.stopReading();
if (_writer != null) _writer.stopWriting();
if (_socket != null)
try {
_socket.close();
} catch (IOException ioe) {
}
_messages.clear();
_acceptedPending.clear();
if (_sessionKeyManager != null) _sessionKeyManager.shutdown();
_manager.unregisterConnection(this);
if (_currentLeaseSet != null) _context.netDb().unpublish(_currentLeaseSet);
_leaseRequest = null;
synchronized (_alreadyProcessed) {
_alreadyProcessed.clear();
}
// _config = null;
// _manager = null;
}
/**
* If the tunnel is short enough, and everybody in the tunnel, and the OBEP or IBGW for the paired
* tunnel, all support the new variable-sized tunnel build message, then use that, otherwise the
* old 8-entry version.
*
* @return null on error
*/
private static TunnelBuildMessage createTunnelBuildMessage(
RouterContext ctx,
TunnelPool pool,
PooledTunnelCreatorConfig cfg,
TunnelInfo pairedTunnel,
BuildExecutor exec) {
Log log = ctx.logManager().getLog(BuildRequestor.class);
long replyTunnel = 0;
Hash replyRouter = null;
boolean useVariable = SEND_VARIABLE && cfg.getLength() <= MEDIUM_RECORDS;
if (cfg.isInbound()) {
// replyTunnel = 0; // as above
replyRouter = ctx.routerHash();
if (useVariable) {
// check the reply OBEP and all the tunnel peers except ourselves
if (!supportsVariable(ctx, pairedTunnel.getPeer(pairedTunnel.getLength() - 1))) {
useVariable = false;
} else {
for (int i = 0; i < cfg.getLength() - 1; i++) {
if (!supportsVariable(ctx, cfg.getPeer(i))) {
useVariable = false;
break;
}
}
}
}
} else {
replyTunnel = pairedTunnel.getReceiveTunnelId(0).getTunnelId();
replyRouter = pairedTunnel.getPeer(0);
if (useVariable) {
// check the reply IBGW and all the tunnel peers except ourselves
if (!supportsVariable(ctx, replyRouter)) {
useVariable = false;
} else {
for (int i = 1; i < cfg.getLength() - 1; i++) {
if (!supportsVariable(ctx, cfg.getPeer(i))) {
useVariable = false;
break;
}
}
}
}
}
// populate and encrypt the message
TunnelBuildMessage msg;
List<Integer> order;
if (useVariable) {
if (cfg.getLength() <= SHORT_RECORDS) {
msg = new VariableTunnelBuildMessage(ctx, SHORT_RECORDS);
order = new ArrayList<Integer>(SHORT_ORDER);
} else {
msg = new VariableTunnelBuildMessage(ctx, MEDIUM_RECORDS);
order = new ArrayList<Integer>(MEDIUM_ORDER);
}
} else {
msg = new TunnelBuildMessage(ctx);
order = new ArrayList<Integer>(ORDER);
}
// This is in BuildExecutor.buildTunnel() now
// long replyMessageId = ctx.random().nextLong(I2NPMessage.MAX_ID_VALUE);
// cfg.setReplyMessageId(replyMessageId);
Collections.shuffle(order, ctx.random()); // randomized placement within the message
cfg.setReplyOrder(order);
if (log.shouldLog(Log.DEBUG)) log.debug("Build order: " + order + " for " + cfg);
for (int i = 0; i < msg.getRecordCount(); i++) {
int hop = order.get(i).intValue();
PublicKey key = null;
if (BuildMessageGenerator.isBlank(cfg, hop)) {
// erm, blank
} else {
Hash peer = cfg.getPeer(hop);
RouterInfo peerInfo = ctx.netDb().lookupRouterInfoLocally(peer);
if (peerInfo == null) {
if (log.shouldLog(Log.WARN))
log.warn(
"Peer selected for hop "
+ i
+ "/"
+ hop
+ " was not found locally: "
+ peer
+ " for "
+ cfg);
return null;
} else {
key = peerInfo.getIdentity().getPublicKey();
}
}
if (log.shouldLog(Log.DEBUG))
log.debug(cfg.getReplyMessageId() + ": record " + i + "/" + hop + " has key " + key);
BuildMessageGenerator.createRecord(i, hop, msg, cfg, replyRouter, replyTunnel, ctx, key);
}
BuildMessageGenerator.layeredEncrypt(ctx, msg, cfg, order);
return msg;
}
/** @since 0.7.12 */
private static boolean supportsVariable(RouterContext ctx, Hash h) {
RouterInfo ri = ctx.netDb().lookupRouterInfoLocally(h);
if (ri == null) return false;
String v = ri.getVersion();
return VersionComparator.comp(v, MIN_VARIABLE_VERSION) >= 0;
}
/**
* Send out a build request message.
*
* @param cfg ReplyMessageId must be set
* @return success
*/
public static boolean request(
RouterContext ctx, TunnelPool pool, PooledTunnelCreatorConfig cfg, BuildExecutor exec) {
// new style crypto fills in all the blanks, while the old style waits for replies to fill in
// the next hop, etc
prepare(ctx, cfg);
if (cfg.getLength() <= 1) {
buildZeroHop(ctx, pool, cfg, exec);
return true;
}
Log log = ctx.logManager().getLog(BuildRequestor.class);
cfg.setTunnelPool(pool);
TunnelInfo pairedTunnel = null;
Hash farEnd = cfg.getFarEnd();
TunnelManagerFacade mgr = ctx.tunnelManager();
boolean isInbound = pool.getSettings().isInbound();
if (pool.getSettings().isExploratory() || !usePairedTunnels(ctx)) {
if (isInbound) pairedTunnel = mgr.selectOutboundExploratoryTunnel(farEnd);
else pairedTunnel = mgr.selectInboundExploratoryTunnel(farEnd);
} else {
// building a client tunnel
if (isInbound)
pairedTunnel = mgr.selectOutboundTunnel(pool.getSettings().getDestination(), farEnd);
else pairedTunnel = mgr.selectInboundTunnel(pool.getSettings().getDestination(), farEnd);
if (pairedTunnel == null) {
if (isInbound) {
// random more reliable than closest ??
// pairedTunnel = mgr.selectOutboundExploratoryTunnel(farEnd);
pairedTunnel = mgr.selectOutboundTunnel();
if (pairedTunnel != null
&& pairedTunnel.getLength() <= 1
&& mgr.getOutboundSettings().getLength() > 0
&& mgr.getOutboundSettings().getLength()
+ mgr.getOutboundSettings().getLengthVariance()
> 0) {
// don't build using a zero-hop expl.,
// as it is both very bad for anonomyity,
// and it takes a build slot away from exploratory
pairedTunnel = null;
}
} else {
// random more reliable than closest ??
// pairedTunnel = mgr.selectInboundExploratoryTunnel(farEnd);
pairedTunnel = mgr.selectInboundTunnel();
if (pairedTunnel != null
&& pairedTunnel.getLength() <= 1
&& mgr.getInboundSettings().getLength() > 0
&& mgr.getInboundSettings().getLength() + mgr.getInboundSettings().getLengthVariance()
> 0) {
// ditto
pairedTunnel = null;
}
}
if (pairedTunnel != null && log.shouldLog(Log.INFO))
log.info("Couldn't find a paired tunnel for " + cfg + ", using exploratory tunnel");
}
}
if (pairedTunnel == null) {
if (log.shouldLog(Log.WARN))
log.warn("Tunnel build failed, as we couldn't find a paired tunnel for " + cfg);
exec.buildComplete(cfg, pool);
// Not even an exploratory tunnel? We are in big trouble.
// Let's not spin through here too fast.
// But don't let a client tunnel waiting for exploratories slow things down too much,
// as there may be other tunnel pools who can build
int ms = pool.getSettings().isExploratory() ? 250 : 25;
try {
Thread.sleep(ms);
} catch (InterruptedException ie) {
}
return false;
}
// long beforeCreate = System.currentTimeMillis();
TunnelBuildMessage msg = createTunnelBuildMessage(ctx, pool, cfg, pairedTunnel, exec);
// long createTime = System.currentTimeMillis()-beforeCreate;
if (msg == null) {
if (log.shouldLog(Log.WARN))
log.warn("Tunnel build failed, as we couldn't create the tunnel build message for " + cfg);
exec.buildComplete(cfg, pool);
return false;
}
// cfg.setPairedTunnel(pairedTunnel);
// long beforeDispatch = System.currentTimeMillis();
if (cfg.isInbound()) {
if (log.shouldLog(Log.INFO))
log.info(
"Sending the tunnel build request "
+ msg.getUniqueId()
+ " out the tunnel "
+ pairedTunnel
+ " to "
+ cfg.getPeer(0)
+ " for "
+ cfg
+ " waiting for the reply of "
+ cfg.getReplyMessageId());
// send it out a tunnel targetting the first hop
// TODO - would be nice to have a TunnelBuildFirstHopFailJob queued if the
// pairedTunnel is zero-hop, but no way to do that?
ctx.tunnelDispatcher().dispatchOutbound(msg, pairedTunnel.getSendTunnelId(0), cfg.getPeer(0));
} else {
if (log.shouldLog(Log.INFO))
log.info(
"Sending the tunnel build request directly to "
+ cfg.getPeer(1)
+ " for "
+ cfg
+ " waiting for the reply of "
+ cfg.getReplyMessageId()
+ " with msgId="
+ msg.getUniqueId());
// send it directly to the first hop
// Add some fuzz to the TBM expiration to make it harder to guess how many hops
// or placement in the tunnel
msg.setMessageExpiration(
ctx.clock().now() + BUILD_MSG_TIMEOUT + ctx.random().nextLong(20 * 1000));
// We set the OutNetMessage expiration much shorter, so that the
// TunnelBuildFirstHopFailJob fires before the 13s build expiration.
RouterInfo peer = ctx.netDb().lookupRouterInfoLocally(cfg.getPeer(1));
if (peer == null) {
if (log.shouldLog(Log.WARN))
log.warn("Could not find the next hop to send the outbound request to: " + cfg);
exec.buildComplete(cfg, pool);
return false;
}
OutNetMessage outMsg =
new OutNetMessage(ctx, msg, ctx.clock().now() + FIRST_HOP_TIMEOUT, PRIORITY, peer);
outMsg.setOnFailedSendJob(new TunnelBuildFirstHopFailJob(ctx, pool, cfg, exec));
ctx.outNetMessagePool().add(outMsg);
}
// if (log.shouldLog(Log.DEBUG))
// log.debug("Tunnel build message " + msg.getUniqueId() + " created in " + createTime
// + "ms and dispatched in " + (System.currentTimeMillis()-beforeDispatch));
return true;
}