Added basic ZeroConf interface.

- registers oneself, browses and resolves services.
 - Lots still TODO:
	- parse TxtRecords.
	- Track peers.
	- feedback to libretroshare
	- etc, etc.
Enabled ZeroConf in libretroshare.pro & rsinit.cc. Compiles and runs on OSX.
Added RelayHandler to Dht, to enable external control of Relays.
Marked pqiAssist Interface for changes... will be revamped with ZeroConf.



git-svn-id: http://svn.code.sf.net/p/retroshare/code/branches/v0.5-dhtmods@4727 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/dht/p3bitdht.cc

@@ -91,6 +91,8 @@ p3BitDht::p3BitDht(std::string id, pqiConnectCb *cb, p3NetMgr *nm,
 
         mPeerSharer = NULL;
 
+	mRelayHandler = NULL;
+
 	std::string dhtVersion = "RS51"; // should come from elsewhere!
         mOwnRsId = id;
 
@@ -162,6 +164,23 @@ void    p3BitDht::setupPeerSharer(pqiNetAssistPeerShare *sharer)
 	mPeerSharer = sharer;
 }
 
+
+/* Support for Outsourced Relay Handling */
+
+void    p3BitDht::installRelayHandler(p3BitDhtRelayHandler *handler)
+{
+	/* The Handler is mutex protected, as its installation can occur when the dht is already running */
+	RsStackMutex stack(dhtMtx);    /********* LOCKED *********/
+
+	mRelayHandler = handler;
+}
+
+UdpRelayReceiver *p3BitDht::getRelayReceiver()
+{
+	return mRelay;
+}
+
+
 void    p3BitDht::start()
 {
 #ifdef DEBUG_BITDHT