Disconnect nodes older than protocol version 70002 (Litecoin 0.8.3.7)

Split MIN_PROTO_VERSION into INIT_PROTO_VERSION and MIN_PEER_PROTO_VERSION

src/main.cpp

@@ -3229,10 +3229,9 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         CAddress addrFrom;
         uint64 nNonce = 1;
         vRecv >> pfrom->nVersion >> pfrom->nServices >> nTime >> addrMe;
-        if (pfrom->nVersion < MIN_PROTO_VERSION)
+        if (pfrom->nVersion < MIN_PEER_PROTO_VERSION)
         {
-            // Since February 20, 2012, the protocol is initiated at version 209,
-            // and earlier versions are no longer supported
+            // disconnect from peers older than this proto version
             printf("partner %s using obsolete version %i; disconnecting\n", pfrom->addr.ToString().c_str(), pfrom->nVersion);
             pfrom->fDisconnect = true;
             return false;

src/net.h

@@ -222,11 +222,11 @@ public:
     CCriticalSection cs_inventory;
     std::multimap<int64, CInv> mapAskFor;
 
-    CNode(SOCKET hSocketIn, CAddress addrIn, std::string addrNameIn = "", bool fInboundIn=false) : ssSend(SER_NETWORK, MIN_PROTO_VERSION)
+    CNode(SOCKET hSocketIn, CAddress addrIn, std::string addrNameIn = "", bool fInboundIn=false) : ssSend(SER_NETWORK, INIT_PROTO_VERSION)
     {
         nServices = 0;
         hSocket = hSocketIn;
-        nRecvVersion = MIN_PROTO_VERSION;
+        nRecvVersion = INIT_PROTO_VERSION;
         nLastSend = 0;
         nLastRecv = 0;
         nSendBytes = 0;

src/version.h

@@ -27,8 +27,11 @@ extern const std::string CLIENT_DATE;
 
 static const int PROTOCOL_VERSION = 70002;
 
-// earlier versions not supported as of Feb 2012, and are disconnected
-static const int MIN_PROTO_VERSION = 209;
+// intial proto version, to be increased after version/verack negotiation
+static const int INIT_PROTO_VERSION = 209;
+
+// disconnect from peers older than this proto version
+static const int MIN_PEER_PROTO_VERSION = 70002;
 
 // nTime field added to CAddress, starting with this version;
 // if possible, avoid requesting addresses nodes older than this