new safety feature displays a warning message and locks down RPC if it detects a problem that may require an upgrade

-- version 0.3.8

git-svn-id: https://bitcoin.svn.sourceforge.net/svnroot/bitcoin/trunk@122 1a98c847-1fd6-4fd8-948a-caf3550aa51b

rpc.cpp

@@ -946,6 +946,10 @@ void ThreadRPCServer2(void* parg)
 
                 printf("ThreadRPCServer method=%s\n", strMethod.c_str());
 
+                // Observe lockdown
+                if (IsLockdown() && strMethod != "help" && strMethod != "stop" && strMethod != "getgenerate" && strMethod != "setgenerate")
+                    throw runtime_error("WARNING: Displayed transactions may not be correct!  You may need to upgrade.");
+
                 // Execute
                 map<string, rpcfn_type>::iterator mi = mapCallTable.find(strMethod);
                 if (mi == mapCallTable.end())