text: // Copyright (c) 2009-2013 The Bitcoin developers
  // Copyright (c) 2017 The SYNERGYWORK developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef BITCOIN_NETBASE_H
  #define BITCOIN_NETBASE_H
  
  #if defined(HAVE_CONFIG_H)
  #include "config/synergywork-config.h"
  #endif
  
  #include "compat.h"
  #include "serialize.h"
  
  #include <stdint.h>
  #include <string>
  #include <vector>
  
  extern int nConnectTimeout;
  extern bool fNameLookup;
  
  /** -timeout default */
  static const int DEFAULT_CONNECT_TIMEOUT = 5000;
  //! -dns default
  static const int DEFAULT_NAME_LOOKUP = true;
  
  #ifdef WIN32
  // In MSVC, this is defined as a macro, undefine it to prevent a compile and link error
  #undef SetPort
  #endif
  
  enum Network {
      NET_UNROUTABLE = 0,
      NET_IPV4,
      NET_IPV6,
      NET_TOR,
  
      NET_MAX,
  };
  
  /** IP address (IPv6, or IPv4 using mapped IPv6 range (::FFFF:0:0/96)) */
  class CNetAddr
  {
  protected:
      unsigned char ip[16]; // in network byte order
  
  public:
      CNetAddr();
      CNetAddr(const struct in_addr& ipv4Addr);
      explicit CNetAddr(const char* pszIp, bool fAllowLookup = false);
      explicit CNetAddr(const std::string& strIp, bool fAllowLookup = false);
      void Init();
      void SetIP(const CNetAddr& ip);
  
      /**
           * Set raw IPv4 or IPv6 address (in network byte order)
           * @note Only NET_IPV4 and NET_IPV6 are allowed for network.
           */
      void SetRaw(Network network, const uint8_t* data);
  
      bool SetSpecial(const std::string& strName); // for Tor addresses
      bool IsIPv4() const;                         // IPv4 mapped address (::FFFF:0:0/96, 0.0.0.0/0)
      bool IsIPv6() const;                         // IPv6 address (not mapped IPv4, not Tor)
      bool IsRFC1918() const;                      // IPv4 private networks (10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12)
      bool IsRFC2544() const;                      // IPv4 inter-network communcations (192.18.0.0/15)
      bool IsRFC6598() const;                      // IPv4 ISP-level NAT (100.64.0.0/10)
      bool IsRFC5737() const;                      // IPv4 documentation addresses (192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24)
      bool IsRFC3849() const;                      // IPv6 documentation address (2001:0DB8::/32)
      bool IsRFC3927() const;                      // IPv4 autoconfig (169.254.0.0/16)
      bool IsRFC3964() const;                      // IPv6 6to4 tunnelling (2002::/16)
      bool IsRFC4193() const;                      // IPv6 unique local (FC00::/7)
      bool IsRFC4380() const;                      // IPv6 Teredo tunnelling (2001::/32)
      bool IsRFC4843() const;                      // IPv6 ORCHID (2001:10::/28)
      bool IsRFC4862() const;                      // IPv6 autoconfig (FE80::/64)
      bool IsRFC6052() const;                      // IPv6 well-known prefix (64:FF9B::/96)
      bool IsRFC6145() const;                      // IPv6 IPv4-translated address (::FFFF:0:0:0/96)
      bool IsTor() const;
      bool IsLocal() const;
      bool IsRoutable() const;
      bool IsValid() const;
      bool IsMulticast() const;
      enum Network GetNetwork() const;
      std::string ToString() const;
      std::string ToStringIP() const;
      unsigned int GetByte(int n) const;
      uint64_t GetHash() const;
      bool GetInAddr(struct in_addr* pipv4Addr) const;
      std::vector<unsigned char> GetGroup() const;
      int GetReachabilityFrom(const CNetAddr* paddrPartner = NULL) const;
  
      CNetAddr(const struct in6_addr& pipv6Addr);
      bool GetIn6Addr(struct in6_addr* pipv6Addr) const;
  
      friend bool operator==(const CNetAddr& a, const CNetAddr& b);
      friend bool operator!=(const CNetAddr& a, const CNetAddr& b);
      friend bool operator<(const CNetAddr& a, const CNetAddr& b);
  
      ADD_SERIALIZE_METHODS;
  
      template <typename Stream, typename Operation>
      inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion)
      {
          READWRITE(FLATDATA(ip));
      }
  
      friend class CSubNet;
  };
  
  class CSubNet
  {
  protected:
      /// Network (base) address
      CNetAddr network;
      /// Netmask, in network byte order
      uint8_t netmask[16];
      /// Is this value valid? (only used to signal parse errors)
      bool valid;
  
  public:
      CSubNet();
      explicit CSubNet(const std::string& strSubnet, bool fAllowLookup = false);
  
      //constructor for single ip subnet (<ipv4>/32 or <ipv6>/128)
      explicit CSubNet(const CNetAddr &addr);
  
      bool Match(const CNetAddr& addr) const;
  
      std::string ToString() const;
      bool IsValid() const;
  
      friend bool operator==(const CSubNet& a, const CSubNet& b);
      friend bool operator!=(const CSubNet& a, const CSubNet& b);
      friend bool operator<(const CSubNet& a, const CSubNet& b);
  
      ADD_SERIALIZE_METHODS;
  
      template <typename Stream, typename Operation>
      inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
          READWRITE(network);
          READWRITE(FLATDATA(netmask));
          READWRITE(FLATDATA(valid));
      }
  };
  
  /** A combination of a network address (CNetAddr) and a (TCP) port */
  class CService : public CNetAddr
  {
  protected:
      unsigned short port; // host order
  
  public:
      CService();
      CService(const CNetAddr& ip, unsigned short port);
      CService(const struct in_addr& ipv4Addr, unsigned short port);
      CService(const struct sockaddr_in& addr);
      explicit CService(const char* pszIpPort, int portDefault, bool fAllowLookup = false);
      explicit CService(const char* pszIpPort, bool fAllowLookup = false);
      explicit CService(const std::string& strIpPort, int portDefault, bool fAllowLookup = false);
      explicit CService(const std::string& strIpPort, bool fAllowLookup = false);
      void Init();
      void SetPort(unsigned short portIn);
      unsigned short GetPort() const;
      bool GetSockAddr(struct sockaddr* paddr, socklen_t* addrlen) const;
      bool SetSockAddr(const struct sockaddr* paddr);
      friend bool operator==(const CService& a, const CService& b);
      friend bool operator!=(const CService& a, const CService& b);
      friend bool operator<(const CService& a, const CService& b);
      std::vector<unsigned char> GetKey() const;
      std::string ToString() const;
      std::string ToStringPort() const;
      std::string ToStringIPPort() const;
  
      CService(const struct in6_addr& ipv6Addr, unsigned short port);
      CService(const struct sockaddr_in6& addr);
  
      ADD_SERIALIZE_METHODS;
  
      template <typename Stream, typename Operation>
      inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion)
      {
          READWRITE(FLATDATA(ip));
          unsigned short portN = htons(port);
          READWRITE(portN);
          if (ser_action.ForRead())
              port = ntohs(portN);
      }
  };
  
  class proxyType
  {
  public:
      proxyType(): randomize_credentials(false) {}
      proxyType(const CService &proxy, bool randomize_credentials=false): proxy(proxy), randomize_credentials(randomize_credentials) {}
  
      bool IsValid() const { return proxy.IsValid(); }
  
      CService proxy;
      bool randomize_credentials;
  };
  
  enum Network ParseNetwork(std::string net);
  std::string GetNetworkName(enum Network net);
  void SplitHostPort(std::string in, int& portOut, std::string& hostOut);
  bool SetProxy(enum Network net, const proxyType &addrProxy);
  bool GetProxy(enum Network net, proxyType& proxyInfoOut);
  bool IsProxy(const CNetAddr& addr);
  bool SetNameProxy(const proxyType &addrProxy);
  bool HaveNameProxy();
  bool LookupHost(const char* pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions = 0, bool fAllowLookup = true);
  bool Lookup(const char* pszName, CService& addr, int portDefault = 0, bool fAllowLookup = true);
  bool Lookup(const char* pszName, std::vector<CService>& vAddr, int portDefault = 0, bool fAllowLookup = true, unsigned int nMaxSolutions = 0);
  bool LookupNumeric(const char* pszName, CService& addr, int portDefault = 0);
  bool ConnectSocket(const CService& addr, SOCKET& hSocketRet, int nTimeout, bool* outProxyConnectionFailed = 0);
  bool ConnectSocketByName(CService& addr, SOCKET& hSocketRet, const char* pszDest, int portDefault, int nTimeout, bool* outProxyConnectionFailed = 0);
  /** Return readable error string for a network error code */
  std::string NetworkErrorString(int err);
  /** Close socket and set hSocket to INVALID_SOCKET */
  bool CloseSocket(SOCKET& hSocket);
  /** Disable or enable blocking-mode for a socket */
  bool SetSocketNonBlocking(SOCKET& hSocket, bool fNonBlocking);
  /**
   * Convert milliseconds to a struct timeval for e.g. select.
   */
  struct timeval MillisToTimeval(int64_t nTimeout);
  
  #endif // BITCOIN_NETBASE_H
  