add isloopbackIPAddress prototype to code/nel/include/nel/net/inet_address.h

add isloopbackIPAddress to code/nel/src/net/inet_address.cpp
add IPv4&IPv6 loopback IP addresses to localAddresses

In code/nel/src/net/unified_network.cpp:
replace is127001 calls by isloopbackIPAddress
change wrong comments about default network id (nid = 0xFF)
When the selected connectionId is not valid
	warnings are not triggered anymore when using default network (nid = 0xFF): the logs were full of warnings and the server was lagging
	When nid = 0xFF, the new connectionId is stored into DefaultNetwork
	When nid <> 0xFF, the new connectionId is stored into NetworkConnectionAssociations[nid]

code/nel/include/nel/net/inet_address.h

@@ -32,6 +32,12 @@ struct in6_addr;
 #ifdef NL_OS_WINDOWS
 // automatically add the win socket library if you use nel network part
 #pragma comment(lib, "ws2_32.lib")
+
+// it seems that the default loop back address is not defined for ipv6
+#ifndef IN6ADDR_LOOPBACK_INIT
+#define IN6ADDR_LOOPBACK_INIT { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 }
+#endif
+
 #endif
 
 namespace NLMISC
@@ -137,6 +143,9 @@ public:
 	/// Returns true if this CInetAddress is 127.0.0.1
 	bool is127001 () const;
 
+	/// Returns true if this CInetAddress is a loop back address
+	bool CInetAddress::isloopbackIPAddress () const;
+
 	/// Creates a CInetAddress object with local host address, port=0
 	static CInetAddress	localHost();
 

code/nel/src/net/inet_address.cpp

@@ -700,6 +700,13 @@ std::vector<CInetAddress> CInetAddress::localAddresses()
 		throw ESocket( "Unable to get local hostname" );
 	}
 
+	// for loopback ipv4
+	struct in_addr *psin_addrIPv4 = NULL;
+
+	// for loopback ipv6
+	struct in6_addr *psin_addrIPv6 = NULL;
+
+
 	// 2. Get address list
 	vector<CInetAddress> vect;
 
@@ -723,16 +730,27 @@ std::vector<CInetAddress> CInetAddress::localAddresses()
 	while (p != NULL)
 	{
 		// check address family
-		if (p->ai_family == AF_INET)
+		if (p->ai_family == AF_INET){ // ipv4
-		{
+			// loopback ipv4
-			// ipv4
+			if(!psin_addrIPv4){ // add loopback address only once
+				struct in_addr *psin_addrIPv4 = new in_addr;
+				psin_addrIPv4->s_addr = htonl(INADDR_LOOPBACK);
+				vect.push_back(CInetAddress(psin_addrIPv4, localhost));
+			}
+			
 			struct sockaddr_in *ipv4 = (struct sockaddr_in *)p->ai_addr;
 
 			vect.push_back( CInetAddress( &ipv4->sin_addr, localhost ) );
+
 		}
-		else if (p->ai_family == AF_INET6)
+		else if (p->ai_family == AF_INET6){ // ipv6
-		{
+			// loopback ipv6
-			// ipv6
+			if(!psin_addrIPv6){ // add loopback address only once
+				struct in6_addr aLoopback6 = IN6ADDR_LOOPBACK_INIT;
+				psin_addrIPv6 = &aLoopback6;
+				vect.push_back(CInetAddress(psin_addrIPv6, localhost));
+			}
+
 			struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)p->ai_addr;
 
 			vect.push_back( CInetAddress( &ipv6->sin6_addr, localhost ) );
@@ -758,6 +776,16 @@ bool CInetAddress::is127001 () const
 	return (internalIPAddress () == htonl(0x7F000001));
 }
 
+bool CInetAddress::isloopbackIPAddress () const
+{
+	const char *sIPAddress = ipAddress().c_str();
+	
+	return	(strcmp(sIPAddress, "::") == 0) ||
+			(strcmp(sIPAddress, "::1") == 0) ||
+			(strcmp(sIPAddress, "127.0.0.1") == 0) ||
+			(strcmp(sIPAddress, "0:0:0:0:0:0:0:1") == 0);
+}
+
 
 std::string vectorCInetAddressToString(const std::vector<CInetAddress> &addrs)
 {

code/nel/src/net/unified_network.cpp

@@ -830,15 +830,14 @@ void	CUnifiedNetwork::addService(const string &name, const vector<CInetAddress>
 		// first we have to look if we have a network that can established the connection
 		
 		uint j = 0;
-		// it s 127.0.0.1, it s ok
+
-		if (!addr[i].is127001 ())
+		if (!addr[i].isloopbackIPAddress ()){ // it 's loopback ip address, it s ok
-		{
+			
 			for (j = 0; j < laddr.size (); j++)
 			{
 				if (laddr[j].internalNetAddress () == addr[i].internalNetAddress ())
 				{
-					// it's ok, we can try
+					break; // it's ok, we can try
-					break;
 				}
 			}
 
@@ -1272,8 +1271,7 @@ uint8 CUnifiedNetwork::findConnectionId (TServiceId sid, uint8 nid)
 	uint8 connectionId = _IdCnx[sid.get()].DefaultNetwork;
 
 	if (nid == 0xFF)
-	{
+	{	// default network
-		// it s often happen because they didn't set a good network configuration, so it s in debug to disable it easily
 		//nldebug ("HNETL5: nid %hu, will use the default connection %hu", (uint16)nid, (uint16)connectionId);
 	}
 	else if (nid >= _IdCnx[sid.get()].NetworkConnectionAssociations.size())
@@ -1294,8 +1292,9 @@ uint8 CUnifiedNetwork::findConnectionId (TServiceId sid, uint8 nid)
 
 	if (connectionId >= _IdCnx[sid.get()].Connections.size() || !_IdCnx[sid.get()].Connections[connectionId].valid() || !_IdCnx[sid.get()].Connections[connectionId].CbNetBase->connected())
 	{
-		// there's a problem with the selected connectionID, so try to find a valid one
+		
-		nlwarning ("HNETL5: Can't find selected connection id %hu to send message to %s because connection is not valid or connected, find a valid connection id", (uint16)connectionId, _IdCnx[sid.get()].ServiceName.c_str ());
+		if(nid != 0xFF) // not a default network. There's a problem with the selected connectionID, so try to find a valid one
+			nlwarning ("HNETL5: Can't find selected connection id %hu to send message to %s because connection is not valid or connected, find a valid connection id", (uint16)connectionId, _IdCnx[sid.get()].ServiceName.c_str ());
 
 		for (connectionId = 0; connectionId < _IdCnx[sid.get()].Connections.size(); connectionId++)
 		{
@@ -1303,6 +1302,14 @@ uint8 CUnifiedNetwork::findConnectionId (TServiceId sid, uint8 nid)
 			{
 				// we found one at last, use this one
 				//nldebug ("HNETL5: Ok, we found a valid connectionid, use %hu",  (uint16)connectionId);
+				if(nid < _IdCnx[sid.get()].NetworkConnectionAssociations.size()){
+					_IdCnx[sid.get()].NetworkConnectionAssociations[nid] = connectionId; // we set the preferred networkConnectionAssociation
+				} else {
+					if(nid == 0xFF){
+						_IdCnx[sid.get()].DefaultNetwork = connectionId;
+					}
+				}
+				nlwarning ("HNETL5: selected connection id %hu from network %hu to send message to %s", (uint16)connectionId, (uint16)nid, _IdCnx[sid.get()].ServiceName.c_str ());
 				break;
 			}
 		}
@@ -1782,7 +1789,7 @@ bool CUnifiedNetwork::isServiceLocal (TServiceId sid)
 	{
 		for (uint j = 0; j < _IdCnx[sid.get()].ExtAddress.size(); j++)
 		{
-			if (_IdCnx[sid.get()].ExtAddress[j].is127001 ())
+			if (_IdCnx[sid.get()].ExtAddress[j].isloopbackIPAddress ())
 				return true;
 
 			if (_IdCnx[sid.get()].ExtAddress[j].internalIPAddress () == laddr[i].internalIPAddress ())