text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2012 The Bitcoin developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  #ifndef VITESCOIN_NET_H
  #define VITESCOIN_NET_H
  
  #include <deque>
  #include <boost/array.hpp>
  #include <boost/foreach.hpp>
  #include <openssl/rand.h>
  
  #ifndef WIN32
  #include <arpa/inet.h>
  #endif
  
  #include "mruset.h"
  #include "netbase.h"
  #include "protocol.h"
  #include "addrman.h"
  
  class CRequestTracker;
  class CNode;
  class CBlockIndex;
  extern int nBestHeight;
  
  
  
  inline unsigned int ReceiveBufferSize() { return 1000*GetArg("-maxreceivebuffer", 5*1000); }
  inline unsigned int SendBufferSize() { return 1000*GetArg("-maxsendbuffer", 1*1000); }
  
  void AddOneShot(std::string strDest);
  bool RecvLine(SOCKET hSocket, std::string& strLine);
  bool GetMyExternalIP(CNetAddr& ipRet);
  void AddressCurrentlyConnected(const CService& addr);
  CNode* FindNode(const CNetAddr& ip);
  CNode* FindNode(const CService& ip);
  CNode* ConnectNode(CAddress addrConnect, const char *strDest = NULL);
  void MapPort();
  unsigned short GetListenPort();
  bool BindListenPort(const CService &bindAddr, std::string& strError=REF(std::string()));
  void StartNode(void* parg);
  bool StopNode();
  
  typedef int NodeId;
  
  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_IRC,    // address reported by IRC (deprecated)
      LOCAL_HTTP,   // address reported by whatismyip.com and similar
      LOCAL_MANUAL, // address explicitly specified (-externalip=)
  
      LOCAL_MAX
  };
  
  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 SeenLocal(const CService& addr);
  bool IsLocal(const CService& addr);
  bool GetLocal(CService &addr, const CNetAddr *paddrPeer = NULL);
  bool IsReachable(const CNetAddr &addr);
  void SetReachable(enum Network net, bool fFlag = true);
  CAddress GetLocalAddress(const CNetAddr *paddrPeer = NULL);
  
  
  enum
  {
      MSG_TX = 1,
      MSG_BLOCK,
  };
  
  class CRequestTracker
  {
  public:
      void (*fn)(void*, CDataStream&);
      void* param1;
  
      explicit CRequestTracker(void (*fnIn)(void*, CDataStream&)=NULL, void* param1In=NULL)
      {
          fn = fnIn;
          param1 = param1In;
      }
  
      bool IsNull()
      {
          return fn == NULL;
      }
  };
  
  
  /** Thread types */
  enum threadId
  {
      THREAD_SOCKETHANDLER,
      THREAD_OPENCONNECTIONS,
      THREAD_MESSAGEHANDLER,
      THREAD_RPCLISTENER,
      THREAD_UPNP,
      THREAD_DNSSEED,
      THREAD_ADDEDCONNECTIONS,
      THREAD_DUMPADDRESS,
      THREAD_RPCHANDLER,
      THREAD_STAKE_MINER,
  
      THREAD_MAX
  };
  
  extern bool fClient;
  extern bool fDiscover;
  extern bool fUseUPnP;
  extern uint64_t nLocalServices;
  extern uint64_t nLocalHostNonce;
  extern CAddress addrSeenByPeer;
  extern boost::array<int, THREAD_MAX> vnThreadsRunning;
  extern CAddrMan addrman;
  
  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 std::map<CInv, int64_t> mapAlreadyAskedFor;
  
  extern NodeId nLastNodeId;
  extern CCriticalSection cs_nLastNodeId;
  
  class CNodeStats
  {
  public:
      NodeId nodeid;
      uint64_t nServices;
      int64_t nLastSend;
      int64_t nLastRecv;
      int64_t nTimeConnected;
      int64_t nTimeOffset;
      std::string addrName;
      int nVersion;
      std::string strSubVer;
      bool fInbound;
      int nStartingHeight;
      int nMisbehavior;
      uint64_t nSendBytes;
      uint64_t nRecvBytes;
      double dPingTime;
      double dPingWait;
      std::string addrLocal;
  };
  
  /** Information about a peer */
  class CNode
  {
  public:
      // socket
      uint64_t nServices;
      SOCKET hSocket;
      CDataStream vSend;
      CDataStream vRecv;
      CCriticalSection cs_vSend;
      CCriticalSection cs_vRecv;
      uint64_t nSendBytes;
      uint64_t nRecvBytes;
      int64_t nLastSend;
      int64_t nLastRecv;
      int64_t nLastSendEmpty;
      int64_t nTimeConnected;
      int64_t nTimeOffset;
      int nHeaderStart;
      unsigned int nMessageStart;
      CAddress addr;
      std::string addrName;
      CService addrLocal;
      int nVersion;
      std::string strSubVer;
      bool fOneShot;
      bool fClient;
      bool fInbound;
      bool fNetworkNode;
      bool fSuccessfullyConnected;
      bool fDisconnect;
      CSemaphoreGrant grantOutbound;
      int nRefCount;
      NodeId id;
  protected:
  
      // Denial-of-service detection/prevention
      // Key is IP address, value is banned-until-time
      static std::map<CNetAddr, int64_t> setBanned;
      static CCriticalSection cs_setBanned;
      int nMisbehavior;
  
  public:
      std::map<uint256, CRequestTracker> mapRequests;
      CCriticalSection cs_mapRequests;
      uint256 hashContinue;
      CBlockIndex* pindexLastGetBlocksBegin;
      uint256 hashLastGetBlocksEnd;
      int nStartingHeight;
  
      // flood relay
      std::vector<CAddress> vAddrToSend;
      std::set<CAddress> setAddrKnown;
      bool fGetAddr;
      std::set<uint256> setKnown;
      uint256 hashCheckpointKnown; // vitescoin: known sent sync-checkpoint
  
      // inventory based relay
      mruset<CInv> setInventoryKnown;
      std::vector<CInv> vInventoryToSend;
      CCriticalSection cs_inventory;
      std::multimap<int64_t, CInv> mapAskFor;
  
      CNode(SOCKET hSocketIn, CAddress addrIn, std::string addrNameIn = "", bool fInboundIn=false) : vSend(SER_NETWORK, MIN_PROTO_VERSION), vRecv(SER_NETWORK, MIN_PROTO_VERSION)
      {
          nServices = 0;
          hSocket = hSocketIn;
          nLastSend = 0;
          nLastRecv = 0;
          nSendBytes = 0;
          nRecvBytes = 0;
          nLastSendEmpty = GetTime();
          nTimeConnected = GetTime();
          nTimeOffset = 0;
          nHeaderStart = -1;
          nMessageStart = -1;
          addr = addrIn;
          addrName = addrNameIn == "" ? addr.ToStringIPPort() : addrNameIn;
          nVersion = 0;
          strSubVer = "";
          fOneShot = false;
          fClient = false; // set by version message
          fInbound = fInboundIn;
          fNetworkNode = false;
          fSuccessfullyConnected = false;
          fDisconnect = false;
          nRefCount = 0;
          hashContinue = 0;
          pindexLastGetBlocksBegin = 0;
          hashLastGetBlocksEnd = 0;
          nStartingHeight = -1;
          fGetAddr = false;
          nMisbehavior = 0;
          hashCheckpointKnown = 0;
          setInventoryKnown.max_size(SendBufferSize() / 1000);
          
          {
              LOCK(cs_nLastNodeId);
              id = nLastNodeId++;
          }
  
          // Be shy and don't send version until we hear
          if (hSocket != INVALID_SOCKET && !fInbound)
              PushVersion();
      }
  
      ~CNode()
      {
          if (hSocket != INVALID_SOCKET)
          {
              closesocket(hSocket);
              hSocket = INVALID_SOCKET;
          }
      }
  
  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;
      }
  
      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))
              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)
      {
          // We're using mapAskFor as a priority queue,
          // the key is the earliest time the request can be sent
          int64_t& nRequestTime = mapAlreadyAskedFor[inv];
          if (fDebugNet)
              printf("askfor %s   %" PRId64" (%s)\n", inv.ToString().c_str(), nRequestTime, DateTimeStrFormat("%H:%M:%S", nRequestTime/1000000).c_str());
  
          // Make sure not to reuse time indexes to keep things in the same order
          int64_t nNow = (GetTime() - 1) * 1000000;
          static int64_t nLastTime;
          ++nLastTime;
          nNow = std::max(nNow, nLastTime);
          nLastTime = nNow;
  
          // Each retry is 2 minutes after the last
          nRequestTime = std::max(nRequestTime + 2 * 60 * 1000000, nNow);
          mapAskFor.insert(std::make_pair(nRequestTime, inv));
      }
  
  
  
      void BeginMessage(const char* pszCommand)
      {
          ENTER_CRITICAL_SECTION(cs_vSend);
          if (nHeaderStart != -1)
              AbortMessage();
          nHeaderStart = vSend.size();
          vSend << CMessageHeader(pszCommand, 0);
          nMessageStart = vSend.size();
          if (fDebug)
              printf("sending: %s ", pszCommand);
      }
  
      void AbortMessage()
      {
          if (nHeaderStart < 0)
              return;
          vSend.resize(nHeaderStart);
          nHeaderStart = -1;
          nMessageStart = -1;
          LEAVE_CRITICAL_SECTION(cs_vSend);
  
          if (fDebug)
              printf("(aborted)\n");
      }
  
      void EndMessage()
      {
          if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
          {
              printf("dropmessages DROPPING SEND MESSAGE\n");
              AbortMessage();
              return;
          }
  
          if (nHeaderStart < 0)
              return;
  
          // Set the size
          unsigned int nSize = vSend.size() - nMessageStart;
          memcpy((char*)&vSend[nHeaderStart] + CMessageHeader::MESSAGE_SIZE_OFFSET, &nSize, sizeof(nSize));
  
          // Set the checksum
          uint256 hash = Hash(vSend.begin() + nMessageStart, vSend.end());
          unsigned int nChecksum = 0;
          memcpy(&nChecksum, &hash, sizeof(nChecksum));
          assert(nMessageStart - nHeaderStart >= CMessageHeader::CHECKSUM_OFFSET + sizeof(nChecksum));
          memcpy((char*)&vSend[nHeaderStart] + CMessageHeader::CHECKSUM_OFFSET, &nChecksum, sizeof(nChecksum));
  
          if (fDebug) {
              printf("(%d bytes)\n", nSize);
          }
  
          nHeaderStart = -1;
          nMessageStart = -1;
          LEAVE_CRITICAL_SECTION(cs_vSend);
      }
  
      void EndMessageAbortIfEmpty()
      {
          if (nHeaderStart < 0)
              return;
          int nSize = vSend.size() - nMessageStart;
          if (nSize > 0)
              EndMessage();
          else
              AbortMessage();
      }
  
  
  
      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);
              vSend << a1;
              EndMessage();
          }
          catch (...)
          {
              AbortMessage();
              throw;
          }
      }
  
      template<typename T1, typename T2>
      void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
      {
          try
          {
              BeginMessage(pszCommand);
              vSend << 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);
              vSend << 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);
              vSend << 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);
              vSend << 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);
              vSend << 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);
              vSend << 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);
              vSend << 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);
              vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9;
              EndMessage();
          }
          catch (...)
          {
              AbortMessage();
              throw;
          }
      }
  
  
      void PushRequest(const char* pszCommand,
                       void (*fn)(void*, CDataStream&), void* param1)
      {
          uint256 hashReply;
          RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
  
          {
              LOCK(cs_mapRequests);
              mapRequests[hashReply] = CRequestTracker(fn, param1);
          }
  
          PushMessage(pszCommand, hashReply);
      }
  
      template<typename T1>
      void PushRequest(const char* pszCommand, const T1& a1,
                       void (*fn)(void*, CDataStream&), void* param1)
      {
          uint256 hashReply;
          RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
  
          {
              LOCK(cs_mapRequests);
              mapRequests[hashReply] = CRequestTracker(fn, param1);
          }
  
          PushMessage(pszCommand, hashReply, a1);
      }
  
      template<typename T1, typename T2>
      void PushRequest(const char* pszCommand, const T1& a1, const T2& a2,
                       void (*fn)(void*, CDataStream&), void* param1)
      {
          uint256 hashReply;
          RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
  
          {
              LOCK(cs_mapRequests);
              mapRequests[hashReply] = CRequestTracker(fn, param1);
          }
  
          PushMessage(pszCommand, hashReply, a1, a2);
      }
  
  
  
      void PushGetBlocks(CBlockIndex* pindexBegin, uint256 hashEnd);
      bool IsSubscribed(unsigned int nChannel);
      void Subscribe(unsigned int nChannel, unsigned int nHops=0);
      void CancelSubscribe(unsigned int nChannel);
      void CloseSocketDisconnect();
      void Cleanup();
  
  
      // 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);
      bool Misbehaving(int howmuch); // 1 == a little, 100 == a lot
      void copyStats(CNodeStats &stats);
    
      // Network stats
      static void RecordBytesRecv(uint64_t bytes);
      static void RecordBytesSent(uint64_t bytes);
  
      static uint64_t GetTotalBytesRecv();
      static uint64_t GetTotalBytesSent();
  };
  
  inline void RelayInventory(const CInv& inv)
  {
      // Put on lists to offer to the other nodes
      {
          LOCK(cs_vNodes);
          BOOST_FOREACH(CNode* pnode, vNodes)
              pnode->PushInventory(inv);
      }
  }
  
  class CTransaction;
  void RelayTransaction(const CTransaction& tx, const uint256& hash);
  void RelayTransaction(const CTransaction& tx, const uint256& hash, const CDataStream& ss);
  
  
  #endif
  