From 422d1225374e2d879dbd116151e0113aa7162500 Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Mon, 13 Aug 2012 05:26:29 +0200
Subject: [PATCH] Add a filter field in CNode, add
 filterload+filteradd+filterclear

---
 src/main.cpp | 45 +++++++++++++++++++++++++++++++++++++++++++++
 src/net.h    |  6 ++++++
 2 files changed, 51 insertions(+)

diff --git a/src/main.cpp b/src/main.cpp
index cb7975af0..9a498ff27 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3332,6 +3332,51 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
     }
 
 
+    else if (strCommand == "filterload")
+    {
+        CBloomFilter filter;
+        vRecv >> filter;
+
+        if (!filter.IsWithinSizeConstraints())
+            // There is no excuse for sending a too-large filter
+            pfrom->Misbehaving(100);
+        else
+        {
+            LOCK(pfrom->cs_filter);
+            delete pfrom->pfilter;
+            pfrom->pfilter = new CBloomFilter(filter);
+        }
+    }
+
+
+    else if (strCommand == "filteradd")
+    {
+        vector<unsigned char> vData;
+        vRecv >> vData;
+
+        // Nodes must NEVER send a data item > 520 bytes (the max size for a script data object,
+        // and thus, the maximum size any matched object can have) in a filteradd message
+        if (vData.size() > 520)
+        {
+            pfrom->Misbehaving(100);
+        } else {
+            LOCK(pfrom->cs_filter);
+            if (pfrom->pfilter)
+                pfrom->pfilter->insert(vData);
+            else
+                pfrom->Misbehaving(100);
+        }
+    }
+
+
+    else if (strCommand == "filterclear")
+    {
+        LOCK(pfrom->cs_filter);
+        delete pfrom->pfilter;
+        pfrom->pfilter = NULL;
+    }
+
+
     else
     {
         // Ignore unknown commands for extensibility
diff --git a/src/net.h b/src/net.h
index 44c80dac2..1ce92eae4 100644
--- a/src/net.h
+++ b/src/net.h
@@ -19,6 +19,7 @@
 #include "protocol.h"
 #include "addrman.h"
 #include "hash.h"
+#include "bloom.h"
 
 class CNode;
 class CBlockIndex;
@@ -152,6 +153,8 @@ public:
     bool fSuccessfullyConnected;
     bool fDisconnect;
     CSemaphoreGrant grantOutbound;
+    CCriticalSection cs_filter;
+    CBloomFilter* pfilter;
 protected:
     int nRefCount;
 
@@ -209,6 +212,7 @@ public:
         fGetAddr = false;
         nMisbehavior = 0;
         setInventoryKnown.max_size(SendBufferSize() / 1000);
+        pfilter = NULL;
 
         // Be shy and don't send version until we hear
         if (!fInbound)
@@ -222,6 +226,8 @@ public:
             closesocket(hSocket);
             hSocket = INVALID_SOCKET;
         }
+        if (pfilter)
+            delete pfilter;
     }
 
 private: