From 5e331d673388f4fdc2eded418f63208dcaec63af Mon Sep 17 00:00:00 2001
From: Adam Ierymenko <adam.ierymenko@gmail.com>
Date: Fri, 10 Apr 2015 10:13:50 -0700
Subject: Restrict unite() to desperation==0 since NAT-t only works right now
 with direct links.

---
 node/Peer.cpp   |  4 ++--
 node/Peer.hpp   | 12 +++++++-----
 node/Switch.cpp |  3 ++-
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/node/Peer.cpp b/node/Peer.cpp
index 8639da8f..1926f2e5 100644
--- a/node/Peer.cpp
+++ b/node/Peer.cpp
@@ -280,11 +280,11 @@ void Peer::resetWithinScope(const RuntimeEnvironment *RR,InetAddress::IpScope sc
 	}
 }
 
-void Peer::getBestActiveAddresses(uint64_t now,InetAddress &v4,InetAddress &v6) const
+void Peer::getBestActiveAddresses(uint64_t now,InetAddress &v4,InetAddress &v6,unsigned int maxDesperation) const
 {
 	uint64_t bestV4 = 0,bestV6 = 0;
 	for(unsigned int p=0,np=_numPaths;p<np;++p) {
-		if (_paths[p].active(now)) {
+		if ((_paths[p].active(now))&&(_paths[p].lastReceiveDesperation() <= maxDesperation)) {
 			uint64_t lr = _paths[p].lastReceived();
 			if (lr) {
 				if (_paths[p].address().isV4()) {
diff --git a/node/Peer.hpp b/node/Peer.hpp
index 65307e9e..231e874d 100644
--- a/node/Peer.hpp
+++ b/node/Peer.hpp
@@ -374,7 +374,7 @@ public:
 	}
 
 	/**
-	 * Get most recently active UDP path addresses for IPv4 and/or IPv6
+	 * Get most recently active path addresses for IPv4 and/or IPv6
 	 *
 	 * Note that v4 and v6 are not modified if they are not found, so
 	 * initialize these to a NULL address to be able to check.
@@ -382,8 +382,9 @@ public:
 	 * @param now Current time
 	 * @param v4 Result parameter to receive active IPv4 address, if any
 	 * @param v6 Result parameter to receive active IPv6 address, if any
+	 * @param maxDesperation Maximum link desperation to consider
 	 */
-	void getBestActiveAddresses(uint64_t now,InetAddress &v4,InetAddress &v6) const;
+	void getBestActiveAddresses(uint64_t now,InetAddress &v4,InetAddress &v6,unsigned int maxDesperation) const;
 
 	/**
 	 * Find a common set of addresses by which two peers can link, if any
@@ -391,13 +392,14 @@ public:
 	 * @param a Peer A
 	 * @param b Peer B
 	 * @param now Current time
+	 * @param maxDesperation Maximum link desperation to consider
 	 * @return Pair: B's address (to send to A), A's address (to send to B)
 	 */
-	static inline std::pair<InetAddress,InetAddress> findCommonGround(const Peer &a,const Peer &b,uint64_t now)
+	static inline std::pair<InetAddress,InetAddress> findCommonGround(const Peer &a,const Peer &b,uint64_t now,unsigned int maxDesperation)
 	{
 		std::pair<InetAddress,InetAddress> v4,v6;
-		b.getBestActiveAddresses(now,v4.first,v6.first);
-		a.getBestActiveAddresses(now,v4.second,v6.second);
+		b.getBestActiveAddresses(now,v4.first,v6.first,maxDesperation);
+		a.getBestActiveAddresses(now,v4.second,v6.second,maxDesperation);
 		if ((v6.first)&&(v6.second)) // prefer IPv6 if both have it since NAT-t is (almost) unnecessary
 			return v6;
 		else if ((v4.first)&&(v4.second))
diff --git a/node/Switch.cpp b/node/Switch.cpp
index caeb3e3a..3710158d 100644
--- a/node/Switch.cpp
+++ b/node/Switch.cpp
@@ -289,7 +289,8 @@ bool Switch::unite(const Address &p1,const Address &p2,bool force)
 
 	const uint64_t now = RR->node->now();
 
-	std::pair<InetAddress,InetAddress> cg(Peer::findCommonGround(*p1p,*p2p,now));
+	// Right now we only unite desperation == 0 links, which will be direct
+	std::pair<InetAddress,InetAddress> cg(Peer::findCommonGround(*p1p,*p2p,now,0));
 	if (!(cg.first))
 		return false;
 
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