(1) Tweak LAN locator beacon frequencies, (2) Windows virtual networks

now show up as *real* networks and prompt the user to set their
location and firewall status (public, private, home/work, etc.).

The hack used to achieve #2 should not be examined by children or those
suffering from epilepsy or heart conditions.

node/Constants.hpp

@@ -387,12 +387,12 @@
 /**
  * How often to broadcast beacons over physical local LANs
  */
-#define ZT_BEACON_INTERVAL ZT_PEER_DIRECT_PING_DELAY
+#define ZT_BEACON_INTERVAL 30000
 
 /**
  * Do not respond to any beacon more often than this
  */
-#define ZT_MIN_BEACON_RESPONSE_INTERVAL (ZT_BEACON_INTERVAL / 64)
+#define ZT_MIN_BEACON_RESPONSE_INTERVAL (ZT_BEACON_INTERVAL / 32)
 
 /**
  * Minimum interval between attempts to do a software update

node/EthernetTap.hpp

@@ -196,21 +196,6 @@ public:
 	 */
 	virtual bool updateMulticastGroups(std::set<MulticastGroup> &groups) = 0;
 
-	/**
-	 * Should this tap device get a pseudo-default-route?
-	 *
-	 * Some platforms (cough Windows) want all "real" network devices to have a
-	 * routing table entry for default, even if it's got a high metric and is
-	 * never used and goes nowhere. If this returns true, the underlying node
-	 * code will use RoutingTable to create one if no default route is
-	 * otherwise defined.
-	 *
-	 * Base class default returns false. Override to return true if needed.
-	 *
-	 * @return True if pseudo-default-route should always exist
-	 */
-	virtual bool createPseudoDefaultRoute() const { return false; }
-
 protected:
 	const char *_implName;
 	MAC _mac;

node/InetAddress.cpp

@@ -39,6 +39,8 @@ namespace ZeroTier {
 
 const InetAddress InetAddress::LO4("127.0.0.1",0);
 const InetAddress InetAddress::LO6("::1",0);
+const InetAddress InetAddress::DEFAULT4((uint32_t)0,0);
+const InetAddress InetAddress::DEFAULT6((const void *)0,16,0);
 
 void InetAddress::set(const std::string &ip,unsigned int port)
 	throw()
@@ -63,11 +65,13 @@ void InetAddress::set(const void *ipBytes,unsigned int ipLen,unsigned int port)
 	memset(&_sa,0,sizeof(_sa));
 	if (ipLen == 4) {
 		setV4();
-		memcpy(rawIpData(),ipBytes,4);
+		if (ipBytes)
+			memcpy(rawIpData(),ipBytes,4);
 		setPort(port);
 	} else if (ipLen == 16) {
 		setV6();
-		memcpy(rawIpData(),ipBytes,16);
+		if (ipBytes)
+			memcpy(rawIpData(),ipBytes,16);
 		setPort(port);
 	}
 }
@@ -91,6 +95,16 @@ bool InetAddress::isLinkLocal() const
 	return false;
 }
 
+bool InetAddress::isDefaultRoute() const
+	throw()
+{
+	if (_sa.saddr.sa_family == AF_INET)
+		return ((_sa.sin.sin_addr.s_addr == 0)&&(_sa.sin.sin_port == 0));
+	else if (_sa.saddr.sa_family == AF_INET6)
+		return ((Utils::isZero(_sa.sin6.sin6_addr.s6_addr,16))&&(_sa.sin6.sin6_port == 0));
+	return false;
+}
+
 std::string InetAddress::toString() const
 {
 	char buf[128],buf2[128];

node/InetAddress.hpp

@@ -77,6 +77,16 @@ public:
 	 */
 	static const InetAddress LO6;
 
+	/**
+	 * 0.0.0.0/0
+	 */
+	static const InetAddress DEFAULT4;
+
+	/**
+	 * ::/0
+	 */
+	static const InetAddress DEFAULT6;
+
 	InetAddress() throw() { memset(&_sa,0,sizeof(_sa)); }
 	InetAddress(const InetAddress &a) throw() { memcpy(&_sa,&a._sa,sizeof(_sa)); }
 	InetAddress(const struct sockaddr *sa) throw() { this->set(sa); }
@@ -147,6 +157,12 @@ public:
 	bool isLinkLocal() const
 		throw();
 
+	/**
+	 * @return True if this ip/netmask would represent a default route (e.g. 0.0.0.0/0)
+	 */
+	bool isDefaultRoute() const
+		throw();
+
 	/**
 	 * @return True if this is a loopback address
 	 */

node/Network.cpp

@@ -39,6 +39,7 @@
 #include "Buffer.hpp"
 #include "EthernetTap.hpp"
 #include "EthernetTapFactory.hpp"
+#include "RoutingTable.hpp"
 
 #define ZT_NETWORK_CERT_WRITE_BUF_SIZE 131072