From 12752af0cc99745d6273ef072645d999c26a9ef7 Mon Sep 17 00:00:00 2001
From: Cory Fields <cory-nospam-@coryfields.com>
Date: Fri, 20 Jan 2017 20:34:57 -0500
Subject: [PATCH] net: don't run callbacks on nodes that haven't completed the
 version handshake

Since ForEach* are can be used to send messages to  all nodes, the caller may
end up sending a message before the version handshake is complete. To limit
this, filter out these nodes. While we're at it, may as well filter out
disconnected nodes as well.

Delete unused methods rather than updating them.
---
 src/net.cpp |  7 ++++-
 src/net.h   | 75 ++++++++++++++---------------------------------------
 2 files changed, 25 insertions(+), 57 deletions(-)

diff --git a/src/net.cpp b/src/net.cpp
index df88b12c7..19358dd5b 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -2630,6 +2630,11 @@ void CNode::AskFor(const CInv& inv)
     mapAskFor.insert(std::make_pair(nRequestTime, inv));
 }
 
+bool CConnman::NodeFullyConnected(const CNode* pnode)
+{
+    return pnode && pnode->fSuccessfullyConnected && !pnode->fDisconnect;
+}
+
 void CConnman::PushMessage(CNode* pnode, CSerializedNetMsg&& msg)
 {
     size_t nMessageSize = msg.data.size();
@@ -2680,7 +2685,7 @@ bool CConnman::ForNode(NodeId id, std::function<bool(CNode* pnode)> func)
             break;
         }
     }
-    return found != nullptr && func(found);
+    return found != nullptr && NodeFullyConnected(found) && func(found);
 }
 
 int64_t PoissonNextSend(int64_t nNow, int average_interval_seconds) {
diff --git a/src/net.h b/src/net.h
index c51ae5a18..05f178f9c 100644
--- a/src/net.h
+++ b/src/net.h
@@ -161,76 +161,34 @@ public:
 
     void PushMessage(CNode* pnode, CSerializedNetMsg&& msg);
 
-    template<typename Callable>
-    bool ForEachNodeContinueIf(Callable&& func)
-    {
-        LOCK(cs_vNodes);
-        for (auto&& node : vNodes)
-            if(!func(node))
-                return false;
-        return true;
-    };
-
-    template<typename Callable>
-    bool ForEachNodeContinueIf(Callable&& func) const
-    {
-        LOCK(cs_vNodes);
-        for (const auto& node : vNodes)
-            if(!func(node))
-                return false;
-        return true;
-    };
-
-    template<typename Callable, typename CallableAfter>
-    bool ForEachNodeContinueIfThen(Callable&& pre, CallableAfter&& post)
-    {
-        bool ret = true;
-        LOCK(cs_vNodes);
-        for (auto&& node : vNodes)
-            if(!pre(node)) {
-                ret = false;
-                break;
-            }
-        post();
-        return ret;
-    };
-
-    template<typename Callable, typename CallableAfter>
-    bool ForEachNodeContinueIfThen(Callable&& pre, CallableAfter&& post) const
-    {
-        bool ret = true;
-        LOCK(cs_vNodes);
-        for (const auto& node : vNodes)
-            if(!pre(node)) {
-                ret = false;
-                break;
-            }
-        post();
-        return ret;
-    };
-
     template<typename Callable>
     void ForEachNode(Callable&& func)
     {
         LOCK(cs_vNodes);
-        for (auto&& node : vNodes)
-            func(node);
+        for (auto&& node : vNodes) {
+            if (NodeFullyConnected(node))
+                func(node);
+        }
     };
 
     template<typename Callable>
     void ForEachNode(Callable&& func) const
     {
         LOCK(cs_vNodes);
-        for (const auto& node : vNodes)
-            func(node);
+        for (auto&& node : vNodes) {
+            if (NodeFullyConnected(node))
+                func(node);
+        }
     };
 
     template<typename Callable, typename CallableAfter>
     void ForEachNodeThen(Callable&& pre, CallableAfter&& post)
     {
         LOCK(cs_vNodes);
-        for (auto&& node : vNodes)
-            pre(node);
+        for (auto&& node : vNodes) {
+            if (NodeFullyConnected(node))
+                pre(node);
+        }
         post();
     };
 
@@ -238,8 +196,10 @@ public:
     void ForEachNodeThen(Callable&& pre, CallableAfter&& post) const
     {
         LOCK(cs_vNodes);
-        for (const auto& node : vNodes)
-            pre(node);
+        for (auto&& node : vNodes) {
+            if (NodeFullyConnected(node))
+                pre(node);
+        }
         post();
     };
 
@@ -372,6 +332,9 @@ private:
     void RecordBytesRecv(uint64_t bytes);
     void RecordBytesSent(uint64_t bytes);
 
+    // Whether the node should be passed out in ForEach* callbacks
+    static bool NodeFullyConnected(const CNode* pnode);
+
     // Network usage totals
     CCriticalSection cs_totalBytesRecv;
     CCriticalSection cs_totalBytesSent;