text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2014 The Bitcoin developers
  // Copyright (c) 2015-2017 The PIVX developers
  // Copyright (c) 2017-2018 The APR Coin developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef BITCOIN_NET_H
  #define BITCOIN_NET_H
  
  #include "bloom.h"
  #include "compat.h"
  #include "hash.h"
  #include "limitedmap.h"
  #include "mruset.h"
  #include "netbase.h"
  #include "protocol.h"
  #include "random.h"
  #include "streams.h"
  #include "sync.h"
  #include "uint256.h"
  #include "utilstrencodings.h"
  
  #include <deque>
  #include <stdint.h>
  
  #ifndef WIN32
  #include <arpa/inet.h>
  #endif
  
  #include <boost/filesystem/path.hpp>
  #include <boost/foreach.hpp>
  #include <boost/signals2/signal.hpp>
  
  class CAddrMan;
  class CBlockIndex;
  class CScheduler;
  class CNode;
  
  namespace boost
  {
  class thread_group;
  } // namespace boost
  
  /** Time between pings automatically sent out for latency probing and keepalive (in seconds). */
  static const int PING_INTERVAL = 2 * 60;
  /** Time after which to disconnect, after waiting for a ping response (or inactivity). */
  static const int TIMEOUT_INTERVAL = 20 * 60;
  /** The maximum number of entries in an 'inv' protocol message */
  static const unsigned int MAX_INV_SZ = 50000;
  /** The maximum number of new addresses to accumulate before announcing. */
  static const unsigned int MAX_ADDR_TO_SEND = 1000;
  /** Maximum length of incoming protocol messages (no message over 2 MiB is currently acceptable). */
  static const unsigned int MAX_PROTOCOL_MESSAGE_LENGTH = 2 * 1024 * 1024;
  /** -listen default */
  static const bool DEFAULT_LISTEN = true;
  /** -upnp default */
  #ifdef USE_UPNP
  static const bool DEFAULT_UPNP = USE_UPNP;
  #else
  static const bool DEFAULT_UPNP = false;
  #endif
  /** The maximum number of entries in mapAskFor */
  static const size_t MAPASKFOR_MAX_SZ = MAX_INV_SZ;
  
  unsigned int ReceiveFloodSize();
  unsigned int SendBufferSize();
  
  void AddOneShot(std::string strDest);
  bool RecvLine(SOCKET hSocket, std::string& strLine);
  void AddressCurrentlyConnected(const CService& addr);
  CNode* FindNode(const CNetAddr& ip);
  CNode* FindNode(const CSubNet& subNet);
  CNode* FindNode(const std::string& addrName);
  CNode* FindNode(const CService& ip);
  CNode* ConnectNode(CAddress addrConnect, const char* pszDest = NULL);
  bool OpenNetworkConnection(const CAddress& addrConnect, CSemaphoreGrant* grantOutbound = NULL, const char* strDest = NULL, bool fOneShot = false);
  void MapPort(bool fUseUPnP);
  unsigned short GetListenPort();
  bool BindListenPort(const CService& bindAddr, std::string& strError, bool fWhitelisted = false);
  void StartNode(boost::thread_group& threadGroup, CScheduler& scheduler);
  bool StopNode();
  void SocketSendData(CNode* pnode);
  
  typedef int NodeId;
  
  // Signals for message handling
  struct CNodeSignals {
      boost::signals2::signal<int()> GetHeight;
      boost::signals2::signal<bool(CNode*)> ProcessMessages;
      boost::signals2::signal<bool(CNode*, bool)> SendMessages;
      boost::signals2::signal<void(NodeId, const CNode*)> InitializeNode;
      boost::signals2::signal<void(NodeId)> FinalizeNode;
  };
  
  
  CNodeSignals& GetNodeSignals();
  
  
  enum {
      LOCAL_NONE,   // unknown
      LOCAL_IF,     // address a local interface listens on
      LOCAL_BIND,   // address explicit bound to
      LOCAL_UPNP,   // address reported by UPnP
      LOCAL_MANUAL, // address explicitly specified (-externalip=)
  
      LOCAL_MAX
  };
  
  bool IsPeerAddrLocalGood(CNode* pnode);
  void AdvertizeLocal(CNode* pnode);
  void SetLimited(enum Network net, bool fLimited = true);
  bool IsLimited(enum Network net);
  bool IsLimited(const CNetAddr& addr);
  bool AddLocal(const CService& addr, int nScore = LOCAL_NONE);
  bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
  bool RemoveLocal(const CService& addr);
  bool SeenLocal(const CService& addr);
  bool IsLocal(const CService& addr);
  bool GetLocal(CService& addr, const CNetAddr* paddrPeer = NULL);
  bool IsReachable(enum Network net);
  bool IsReachable(const CNetAddr& addr);
  void SetReachable(enum Network net, bool fFlag = true);
  CAddress GetLocalAddress(const CNetAddr* paddrPeer = NULL);
  
  
  extern bool fDiscover;
  extern bool fListen;
  extern uint64_t nLocalServices;
  extern uint64_t nLocalHostNonce;
  extern CAddrMan addrman;
  extern int nMaxConnections;
  
  extern std::vector<CNode*> vNodes;
  extern CCriticalSection cs_vNodes;
  extern std::map<CInv, CDataStream> mapRelay;
  extern std::deque<std::pair<int64_t, CInv> > vRelayExpiration;
  extern CCriticalSection cs_mapRelay;
  extern limitedmap<CInv, int64_t> mapAlreadyAskedFor;
  
  extern std::vector<std::string> vAddedNodes;
  extern CCriticalSection cs_vAddedNodes;
  
  extern NodeId nLastNodeId;
  extern CCriticalSection cs_nLastNodeId;
  
  struct LocalServiceInfo {
      int nScore;
      int nPort;
  };
  
  extern CCriticalSection cs_mapLocalHost;
  extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost;
  
  class CNodeStats
  {
  public:
      NodeId nodeid;
      uint64_t nServices;
      int64_t nLastSend;
      int64_t nLastRecv;
      int64_t nTimeConnected;
      std::string addrName;
      int nVersion;
      std::string cleanSubVer;
      bool fInbound;
      int nStartingHeight;
      uint64_t nSendBytes;
      uint64_t nRecvBytes;
      bool fWhitelisted;
      double dPingTime;
      double dPingWait;
      std::string addrLocal;
  };
  
  
  class CNetMessage
  {
  public:
      bool in_data; // parsing header (false) or data (true)
  
      CDataStream hdrbuf; // partially received header
      CMessageHeader hdr; // complete header
      unsigned int nHdrPos;
  
      CDataStream vRecv; // received message data
      unsigned int nDataPos;
  
      int64_t nTime; // time (in microseconds) of message receipt.
  
      CNetMessage(int nTypeIn, int nVersionIn) : hdrbuf(nTypeIn, nVersionIn), vRecv(nTypeIn, nVersionIn)
      {
          hdrbuf.resize(24);
          in_data = false;
          nHdrPos = 0;
          nDataPos = 0;
          nTime = 0;
      }
  
      bool complete() const
      {
          if (!in_data)
              return false;
          return (hdr.nMessageSize == nDataPos);
      }
  
      void SetVersion(int nVersionIn)
      {
          hdrbuf.SetVersion(nVersionIn);
          vRecv.SetVersion(nVersionIn);
      }
  
      int readHeader(const char* pch, unsigned int nBytes);
      int readData(const char* pch, unsigned int nBytes);
  };
  
  
  typedef enum BanReason
  {
      BanReasonUnknown          = 0,
      BanReasonNodeMisbehaving  = 1,
      BanReasonManuallyAdded    = 2
  } BanReason;
  
  class CBanEntry
  {
  public:
      static const int CURRENT_VERSION=1;
      int nVersion;
      int64_t nCreateTime;
      int64_t nBanUntil;
      uint8_t banReason;
  
      CBanEntry()
      {
          SetNull();
      }
  
      CBanEntry(int64_t nCreateTimeIn)
      {
          SetNull();
          nCreateTime = nCreateTimeIn;
      }
  
      ADD_SERIALIZE_METHODS;
  
      template <typename Stream, typename Operation>
      inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
          READWRITE(this->nVersion);
          nVersion = this->nVersion;
          READWRITE(nCreateTime);
          READWRITE(nBanUntil);
          READWRITE(banReason);
      }
  
      void SetNull()
      {
          nVersion = CBanEntry::CURRENT_VERSION;
          nCreateTime = 0;
          nBanUntil = 0;
          banReason = BanReasonUnknown;
      }
  
      std::string banReasonToString()
      {
          switch (banReason) {
          case BanReasonNodeMisbehaving:
              return "node misbehabing";
          case BanReasonManuallyAdded:
              return "manually added";
          default:
              return "unknown";
          }
      }
  };
  
  typedef std::map<CSubNet, CBanEntry> banmap_t;
  
  
  /** Information about a peer */
  class CNode
  {
  public:
      // socket
      uint64_t nServices;
      SOCKET hSocket;
      CDataStream ssSend;
      size_t nSendSize;   // total size of all vSendMsg entries
      size_t nSendOffset; // offset inside the first vSendMsg already sent
      uint64_t nSendBytes;
      std::deque<CSerializeData> vSendMsg;
      CCriticalSection cs_vSend;
  
      std::deque<CInv> vRecvGetData;
      std::deque<CNetMessage> vRecvMsg;
      CCriticalSection cs_vRecvMsg;
      uint64_t nRecvBytes;
      int nRecvVersion;
  
      int64_t nLastSend;
      int64_t nLastRecv;
      int64_t nTimeConnected;
      CAddress addr;
      std::string addrName;
      CService addrLocal;
      int nVersion;
      // strSubVer is whatever byte array we read from the wire. However, this field is intended
      // to be printed out, displayed to humans in various forms and so on. So we sanitize it and
      // store the sanitized version in cleanSubVer. The original should be used when dealing with
      // the network or wire types and the cleaned string used when displayed or logged.
      std::string strSubVer, cleanSubVer;
      bool fWhitelisted; // This peer can bypass DoS banning.
      bool fOneShot;
      bool fClient;
      bool fInbound;
      bool fNetworkNode;
      bool fSuccessfullyConnected;
      bool fDisconnect;
      // We use fRelayTxes for two purposes -
      // a) it allows us to not relay tx invs before receiving the peer's version message
      // b) the peer may tell us in their version message that we should not relay tx invs
      //    until they have initialized their bloom filter.
      bool fRelayTxes;
      CSemaphoreGrant grantOutbound;
      CCriticalSection cs_filter;
      CBloomFilter* pfilter;
      int nRefCount;
      NodeId id;
  
  protected:
      // Denial-of-service detection/prevention
      // Key is IP address, value is banned-until-time
      static banmap_t setBanned;
      static CCriticalSection cs_setBanned;
      static bool setBannedIsDirty;
  
      std::vector<std::string> vecRequestsFulfilled; //keep track of what client has asked for
  
      // Whitelisted ranges. Any node connecting from these is automatically
      // whitelisted (as well as those connecting to whitelisted binds).
      static std::vector<CSubNet> vWhitelistedRange;
      static CCriticalSection cs_vWhitelistedRange;
  
      // Basic fuzz-testing
      void Fuzz(int nChance); // modifies ssSend
  
  public:
      uint256 hashContinue;
      int nStartingHeight;
  
      // flood relay
      std::vector<CAddress> vAddrToSend;
      mruset<CAddress> setAddrKnown;
      bool fGetAddr;
      std::set<uint256> setKnown;
  
      // inventory based relay
      mruset<CInv> setInventoryKnown;
      std::vector<CInv> vInventoryToSend;
      CCriticalSection cs_inventory;
      std::multimap<int64_t, CInv> mapAskFor;
      std::vector<uint256> vBlockRequested;
  
      // Ping time measurement:
      // The pong reply we're expecting, or 0 if no pong expected.
      uint64_t nPingNonceSent;
      // Time (in usec) the last ping was sent, or 0 if no ping was ever sent.
      int64_t nPingUsecStart;
      // Last measured round-trip time.
      int64_t nPingUsecTime;
      // Whether a ping is requested.
      bool fPingQueued;
  
      CNode(SOCKET hSocketIn, CAddress addrIn, std::string addrNameIn = "", bool fInboundIn = false);
      ~CNode();
  
  private:
      // Network usage totals
      static CCriticalSection cs_totalBytesRecv;
      static CCriticalSection cs_totalBytesSent;
      static uint64_t nTotalBytesRecv;
      static uint64_t nTotalBytesSent;
  
      CNode(const CNode&);
      void operator=(const CNode&);
  
  public:
      NodeId GetId() const
      {
          return id;
      }
  
      int GetRefCount()
      {
          assert(nRefCount >= 0);
          return nRefCount;
      }
  
      // requires LOCK(cs_vRecvMsg)
      unsigned int GetTotalRecvSize()
      {
          unsigned int total = 0;
          BOOST_FOREACH (const CNetMessage& msg, vRecvMsg)
              total += msg.vRecv.size() + 24;
          return total;
      }
  
      // requires LOCK(cs_vRecvMsg)
      bool ReceiveMsgBytes(const char* pch, unsigned int nBytes);
  
      // requires LOCK(cs_vRecvMsg)
      void SetRecvVersion(int nVersionIn)
      {
          nRecvVersion = nVersionIn;
          BOOST_FOREACH (CNetMessage& msg, vRecvMsg)
              msg.SetVersion(nVersionIn);
      }
  
      CNode* AddRef()
      {
          nRefCount++;
          return this;
      }
  
      void Release()
      {
          nRefCount--;
      }
  
  
      void AddAddressKnown(const CAddress& addr)
      {
          setAddrKnown.insert(addr);
      }
  
      void PushAddress(const CAddress& addr)
      {
          // Known checking here is only to save space from duplicates.
          // SendMessages will filter it again for knowns that were added
          // after addresses were pushed.
          if (addr.IsValid() && !setAddrKnown.count(addr)) {
              if (vAddrToSend.size() >= MAX_ADDR_TO_SEND) {
                  vAddrToSend[insecure_rand() % vAddrToSend.size()] = addr;
              } else {
                  vAddrToSend.push_back(addr);
              }
          }
      }
  
  
      void AddInventoryKnown(const CInv& inv)
      {
          {
              LOCK(cs_inventory);
              setInventoryKnown.insert(inv);
          }
      }
  
      void PushInventory(const CInv& inv)
      {
          {
              LOCK(cs_inventory);
              if (!setInventoryKnown.count(inv))
                  vInventoryToSend.push_back(inv);
          }
      }
  
      void AskFor(const CInv& inv);
  
      // TODO: Document the postcondition of this function.  Is cs_vSend locked?
      void BeginMessage(const char* pszCommand) EXCLUSIVE_LOCK_FUNCTION(cs_vSend);
  
      // TODO: Document the precondition of this function.  Is cs_vSend locked?
      void AbortMessage() UNLOCK_FUNCTION(cs_vSend);
  
      // TODO: Document the precondition of this function.  Is cs_vSend locked?
      void EndMessage() UNLOCK_FUNCTION(cs_vSend);
  
      void PushVersion();
  
  
      void PushMessage(const char* pszCommand)
      {
          try {
              BeginMessage(pszCommand);
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      template <typename T1>
      void PushMessage(const char* pszCommand, const T1& a1)
      {
          try {
              BeginMessage(pszCommand);
              ssSend << a1;
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      template <typename T1, typename T2>
      void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
      {
          try {
              BeginMessage(pszCommand);
              ssSend << a1 << a2;
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      template <typename T1, typename T2, typename T3>
      void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3)
      {
          try {
              BeginMessage(pszCommand);
              ssSend << a1 << a2 << a3;
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      template <typename T1, typename T2, typename T3, typename T4>
      void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4)
      {
          try {
              BeginMessage(pszCommand);
              ssSend << a1 << a2 << a3 << a4;
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      template <typename T1, typename T2, typename T3, typename T4, typename T5>
      void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5)
      {
          try {
              BeginMessage(pszCommand);
              ssSend << a1 << a2 << a3 << a4 << a5;
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
      void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6)
      {
          try {
              BeginMessage(pszCommand);
              ssSend << a1 << a2 << a3 << a4 << a5 << a6;
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
      void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7)
      {
          try {
              BeginMessage(pszCommand);
              ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7;
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
      void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8)
      {
          try {
              BeginMessage(pszCommand);
              ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8;
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
      void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9)
      {
          try {
              BeginMessage(pszCommand);
              ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9;
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10>
      void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9, const T10& a10)
      {
          try {
              BeginMessage(pszCommand);
              ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9 << a10;
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10, typename T11>
      void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9, const T10& a10, const T11& a11)
      {
          try {
              BeginMessage(pszCommand);
              ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9 << a10 << a11;
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10, typename T11, typename T12>
      void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9, const T10& a10, const T11& a11, const T12& a12)
      {
          try {
              BeginMessage(pszCommand);
              ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9 << a10 << a11 << a12;
              EndMessage();
          } catch (...) {
              AbortMessage();
              throw;
          }
      }
  
      bool HasFulfilledRequest(std::string strRequest)
      {
          BOOST_FOREACH (std::string& type, vecRequestsFulfilled) {
              if (type == strRequest) return true;
          }
          return false;
      }
  
      void ClearFulfilledRequest(std::string strRequest)
      {
          std::vector<std::string>::iterator it = vecRequestsFulfilled.begin();
          while (it != vecRequestsFulfilled.end()) {
              if ((*it) == strRequest) {
                  vecRequestsFulfilled.erase(it);
                  return;
              }
              ++it;
          }
      }
  
      void FulfilledRequest(std::string strRequest)
      {
          if (HasFulfilledRequest(strRequest)) return;
          vecRequestsFulfilled.push_back(strRequest);
      }
  
      bool IsSubscribed(unsigned int nChannel);
      void Subscribe(unsigned int nChannel, unsigned int nHops = 0);
      void CancelSubscribe(unsigned int nChannel);
      void CloseSocketDisconnect();
      bool DisconnectOldProtocol(int nVersionRequired, std::string strLastCommand = "");
  
      // 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.
      static void ClearBanned(); // needed for unit testing
      static bool IsBanned(CNetAddr ip);
      static bool IsBanned(CSubNet subnet);
      static void Ban(const CNetAddr &ip, const BanReason &banReason, int64_t bantimeoffset = 0, bool sinceUnixEpoch = false);
      static void Ban(const CSubNet &subNet, const BanReason &banReason, int64_t bantimeoffset = 0, bool sinceUnixEpoch = false);
      static bool Unban(const CNetAddr &ip);
      static bool Unban(const CSubNet &ip);
      static void GetBanned(banmap_t &banmap);
      static void SetBanned(const banmap_t &banmap);
  
      //!check is the banlist has unwritten changes
      static bool BannedSetIsDirty();
      //!set the "dirty" flag for the banlist
      static void SetBannedSetDirty(bool dirty=true);
      //!clean unused entires (if bantime has expired)
      static void SweepBanned();
  
      void copyStats(CNodeStats& stats);
  
      static bool IsWhitelistedRange(const CNetAddr& ip);
      static void AddWhitelistedRange(const CSubNet& subnet);
  
      // Network stats
      static void RecordBytesRecv(uint64_t bytes);
      static void RecordBytesSent(uint64_t bytes);
  
      static uint64_t GetTotalBytesRecv();
      static uint64_t GetTotalBytesSent();
  };
  
  class CExplicitNetCleanup
  {
  public:
      static void callCleanup();
  };
  
  class CTransaction;
  void RelayTransaction(const CTransaction& tx);
  void RelayTransaction(const CTransaction& tx, const CDataStream& ss);
  void RelayTransactionLockReq(const CTransaction& tx, bool relayToAll = false);
  void RelayInv(CInv& inv);
  
  /** Access to the (IP) address database (peers.dat) */
  class CAddrDB
  {
  private:
      boost::filesystem::path pathAddr;
  
  public:
      CAddrDB();
      bool Write(const CAddrMan& addr);
      bool Read(CAddrMan& addr);
  };
  
  /** Access to the banlist database (banlist.dat) */
  class CBanDB
  {
  private:
      boost::filesystem::path pathBanlist;
  public:
      CBanDB();
      bool Write(const banmap_t& banSet);
      bool Read(banmap_t& banSet);
  };
  
  void DumpBanlist();
  
  #endif // BITCOIN_NET_H
  