banman: create and split out banman

Some say he has always been.

src/net.h

@@ -86,7 +86,7 @@ static const size_t DEFAULT_MAXRECEIVEBUFFER = 5 * 1000;
 static const size_t DEFAULT_MAXSENDBUFFER    = 1 * 1000;
 
 // NOTE: When adjusting this, update rpcnet:setban's help ("24h")
-static const unsigned int DEFAULT_MISBEHAVING_BANTIME = 60 * 60 * 24;  // Default 24-hour ban
+static constexpr unsigned int DEFAULT_MISBEHAVING_BANTIME = 60 * 60 * 24;  // Default 24-hour ban
 
 typedef int64_t NodeId;
 
@@ -114,6 +114,50 @@ struct CSerializedNetMsg
     std::string command;
 };
 
+
+class BanMan
+{
+public:
+    // Denial-of-service detection/prevention
+    // The idea is to detect peers that are behaving
+    // badly and disconnect/ban them, but do it in a
+    // one-coding-mistake-won't-shatter-the-entire-network
+    // way.
+    // IMPORTANT:  There should be nothing I can give a
+    // node that it will forward on that will make that
+    // node's peers drop it. If there is, an attacker
+    // can isolate a node and/or try to split the network.
+    // Dropping a node for sending stuff that is invalid
+    // now but might be valid in a later version is also
+    // dangerous, because it can cause a network split
+    // between nodes running old code and nodes running
+    // new code.
+    ~BanMan();
+    BanMan(CClientUIInterface* client_interface);
+    void Ban(const CNetAddr& netAddr, const BanReason& reason, int64_t bantimeoffset = 0, bool sinceUnixEpoch = false);
+    void Ban(const CSubNet& subNet, const BanReason& reason, int64_t bantimeoffset = 0, bool sinceUnixEpoch = false);
+    void ClearBanned(); // needed for unit testing
+    bool IsBanned(CNetAddr ip);
+    bool IsBanned(CSubNet subnet);
+    bool Unban(const CNetAddr &ip);
+    bool Unban(const CSubNet &ip);
+    void GetBanned(banmap_t &banmap);
+    void DumpBanlist();
+
+private:
+    void SetBanned(const banmap_t &banmap);
+    bool BannedSetIsDirty();
+    //!set the "dirty" flag for the banlist
+    void SetBannedSetDirty(bool dirty=true);
+    //!clean unused entries (if bantime has expired)
+    void SweepBanned();
+
+    banmap_t setBanned;
+    CCriticalSection cs_setBanned;
+    bool setBannedIsDirty;
+    CClientUIInterface* clientInterface = nullptr;
+};
+
 class NetEventsInterface;
 class CConnman
 {
@@ -136,6 +180,7 @@ public:
         int nBestHeight = 0;
         CClientUIInterface* uiInterface = nullptr;
         NetEventsInterface* m_msgproc = nullptr;
+        BanMan* m_banman = nullptr;
         unsigned int nSendBufferMaxSize = 0;
         unsigned int nReceiveFloodSize = 0;
         uint64_t nMaxOutboundTimeframe = 0;
@@ -158,6 +203,7 @@ public:
         nMaxFeeler = connOptions.nMaxFeeler;
         nBestHeight = connOptions.nBestHeight;
         clientInterface = connOptions.uiInterface;
+        m_banman = connOptions.m_banman;
         m_msgproc = connOptions.m_msgproc;
         nSendBufferMaxSize = connOptions.nSendBufferMaxSize;
         nReceiveFloodSize = connOptions.nReceiveFloodSize;
@@ -238,30 +284,6 @@ public:
     void AddNewAddresses(const std::vector<CAddress>& vAddr, const CAddress& addrFrom, int64_t nTimePenalty = 0);
     std::vector<CAddress> GetAddresses();
 
-    // Denial-of-service detection/prevention
-    // The idea is to detect peers that are behaving
-    // badly and disconnect/ban them, but do it in a
-    // one-coding-mistake-won't-shatter-the-entire-network
-    // way.
-    // IMPORTANT:  There should be nothing I can give a
-    // node that it will forward on that will make that
-    // node's peers drop it. If there is, an attacker
-    // can isolate a node and/or try to split the network.
-    // Dropping a node for sending stuff that is invalid
-    // now but might be valid in a later version is also
-    // dangerous, because it can cause a network split
-    // between nodes running old code and nodes running
-    // new code.
-    void Ban(const CNetAddr& netAddr, const BanReason& reason, int64_t bantimeoffset = 0, bool sinceUnixEpoch = false);
-    void Ban(const CSubNet& subNet, const BanReason& reason, int64_t bantimeoffset = 0, bool sinceUnixEpoch = false);
-    void ClearBanned(); // needed for unit testing
-    bool IsBanned(CNetAddr ip);
-    bool IsBanned(CSubNet subnet);
-    bool Unban(const CNetAddr &ip);
-    bool Unban(const CSubNet &ip);
-    void GetBanned(banmap_t &banmap);
-    void SetBanned(const banmap_t &banmap);
-
     // This allows temporarily exceeding nMaxOutbound, with the goal of finding
     // a peer that is better than all our current peers.
     void SetTryNewOutboundPeer(bool flag);
@@ -370,15 +392,7 @@ private:
     NodeId GetNewNodeId();
 
     size_t SocketSendData(CNode *pnode) const;
-    //!check is the banlist has unwritten changes
-    bool BannedSetIsDirty();
-    //!set the "dirty" flag for the banlist
-    void SetBannedSetDirty(bool dirty=true);
-    //!clean unused entries (if bantime has expired)
-    void SweepBanned();
     void DumpAddresses();
-    void DumpData();
-    void DumpBanlist();
 
     // Network stats
     void RecordBytesRecv(uint64_t bytes);
@@ -411,9 +425,6 @@ private:
 
     std::vector<ListenSocket> vhListenSocket;
     std::atomic<bool> fNetworkActive{true};
-    banmap_t setBanned GUARDED_BY(cs_setBanned);
-    CCriticalSection cs_setBanned;
-    bool setBannedIsDirty GUARDED_BY(cs_setBanned){false};
     bool fAddressesInitialized{false};
     CAddrMan addrman;
     std::deque<std::string> vOneShots GUARDED_BY(cs_vOneShots);
@@ -439,6 +450,7 @@ private:
     std::atomic<int> nBestHeight;
     CClientUIInterface* clientInterface;
     NetEventsInterface* m_msgproc;
+    BanMan* m_banman;
 
     /** SipHasher seeds for deterministic randomness */
     const uint64_t nSeed0, nSeed1;
@@ -468,6 +480,7 @@ private:
     friend struct CConnmanTest;
 };
 extern std::unique_ptr<CConnman> g_connman;
+extern std::unique_ptr<BanMan> g_banman;
 void Discover();
 void StartMapPort();
 void InterruptMapPort();