Add obsolete nodes disconnection on spork activation

src/main.cpp

@@ -4405,7 +4405,6 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
         if (pfrom->nVersion < MinPeerProtoVersion())
         {
             // disconnect from peers older than this proto version
-            // Sunday, April 1, 2018 12:00:00 AM
             LogPrintf("peer=%d using obsolete version %i; disconnecting\n", pfrom->id, pfrom->nVersion);
             pfrom->PushMessage("reject", strCommand, REJECT_OBSOLETE,
                                strprintf("Version must be %d or greater", MinPeerProtoVersion()));

src/spork.cpp

@@ -133,16 +133,25 @@ int64_t GetSporkValue(int nSporkID)
 
 void ExecuteSpork(int nSporkID, int nValue)
 {
-    if(nSporkID == SPORK_11_RESET_BUDGET && nValue == 1){
+    if (nSporkID == SPORK_11_RESET_BUDGET && nValue == 1)
+    {
         budget.Clear();
     }
-
-    //correct fork via spork technology
-    if(nSporkID == SPORK_12_RECONSIDER_BLOCKS && nValue > 0) {
+    else if (nSporkID == SPORK_12_RECONSIDER_BLOCKS && nValue > 0)
+    {
+        //correct fork via spork technology
         LogPrintf("Spork::ExecuteSpork -- Reconsider Last %d Blocks\n", nValue);
-
         ReprocessBlocks(nValue);
     }
+    else if (nSporkID == SPORK_16_DISCONNECT_OLD_NODES && nValue == 1)
+    {
+        LOCK(cs_vNodes);
+        for (auto node: vNodes)
+        {
+            if (node->nVersion < MinPeerProtoVersion())
+                node->fDisconnect = true;
+        }
+    }
 }
 
 void ReprocessBlocks(int nBlocks)