/** connect to the given destination */
I2PSocket connect(PeerID peer) throws IOException {
I2PSocketManager mgr = _manager;
if (mgr == null) throw new IOException("No socket manager");
Destination addr = peer.getAddress();
if (addr == null) throw new IOException("Null address");
if (addr.equals(getMyDestination())) throw new IOException("Attempt to connect to myself");
Hash dest = addr.calculateHash();
if (_banlist.contains(dest))
throw new IOException("Not trying to contact " + dest.toBase64() + ", as they are banlisted");
try {
// TODO opts.setPort(xxx); connect(addr, opts)
// DHT moved above 6881 in 0.9.9
I2PSocket rv = _manager.connect(addr);
if (rv != null) _banlist.remove(dest);
return rv;
} catch (I2PException ie) {
_banlist.add(dest);
_context.simpleScheduler().addEvent(new Unbanlist(dest), 10 * 60 * 1000);
IOException ioe = new IOException("Unable to reach the peer " + peer);
ioe.initCause(ie);
throw ioe;
}
}
/**
* Receive an incoming connection (built from a received SYN) Non-SYN packets with a zero
* SendStreamID may also be queued here so that they don't get thrown away while the SYN packet
* before it is queued.
*
* @param timeoutMs max amount of time to wait for a connection (if less than 1ms, wait
* indefinitely)
* @return connection received, or null if there was a timeout or the handler was shut down
*/
public Connection accept(long timeoutMs) {
if (_log.shouldLog(Log.DEBUG)) _log.debug("Accept(" + timeoutMs + ") called");
long expiration = timeoutMs + _context.clock().now();
while (true) {
if ((timeoutMs > 0) && (expiration < _context.clock().now())) return null;
if (!_active) {
// fail all the ones we had queued up
while (true) {
Packet packet = _synQueue.poll(); // fails immediately if empty
if (packet == null || packet.getOptionalDelay() == PoisonPacket.POISON_MAX_DELAY_REQUEST)
break;
sendReset(packet);
}
return null;
}
Packet syn = null;
while (_active && syn == null) {
if (_log.shouldLog(Log.DEBUG))
_log.debug(
"Accept(" + timeoutMs + "): active=" + _active + " queue: " + _synQueue.size());
if (timeoutMs <= 0) {
try {
syn = _synQueue.take(); // waits forever
} catch (InterruptedException ie) {
} // { break;}
} else {
long remaining = expiration - _context.clock().now();
// (dont think this applies anymore for LinkedBlockingQueue)
// BUGFIX
// The specified amount of real time has elapsed, more or less.
// If timeout is zero, however, then real time is not taken into consideration
// and the thread simply waits until notified.
if (remaining < 1) break;
try {
syn = _synQueue.poll(remaining, TimeUnit.MILLISECONDS); // waits the specified time max
} catch (InterruptedException ie) {
}
break;
}
}
if (syn != null) {
if (syn.getOptionalDelay() == PoisonPacket.POISON_MAX_DELAY_REQUEST) return null;
// deal with forged / invalid syn packets in _manager.receiveConnection()
// Handle both SYN and non-SYN packets in the queue
if (syn.isFlagSet(Packet.FLAG_SYNCHRONIZE)) {
// We are single-threaded here, so this is
// a good place to check for dup SYNs and drop them
Destination from = syn.getOptionalFrom();
if (from == null) {
if (_log.shouldLog(Log.WARN)) _log.warn("Dropping SYN packet with no FROM: " + syn);
// drop it
continue;
}
Connection oldcon = _manager.getConnectionByOutboundId(syn.getReceiveStreamId());
if (oldcon != null) {
// His ID not guaranteed to be unique to us, but probably is...
// only drop it on a destination match too
if (from.equals(oldcon.getRemotePeer())) {
if (_log.shouldLog(Log.WARN)) _log.warn("Dropping dup SYN: " + syn);
continue;
}
}
Connection con = _manager.receiveConnection(syn);
if (con != null) return con;
} else {
reReceivePacket(syn);
// ... and keep looping
}
}
// keep looping...
}
}