nattypes.cc

本人收集整理的一份c/c++跨平台网络库

#include <cassert>

#include "nattypes.h"

namespace utils_base {

class SymmetricNAT : public NAT {
public:
  bool IsSymmetric() { return true; }
  bool FiltersIP() { return true; }
  bool FiltersPort() { return true; }
};

class OpenConeNAT : public NAT {
public:
  bool IsSymmetric() { return false; }
  bool FiltersIP() { return false; }
  bool FiltersPort() { return false; }
};

class AddressRestrictedNAT : public NAT {
public:
  bool IsSymmetric() { return false; }
  bool FiltersIP() { return true; }
  bool FiltersPort() { return false; }
};

class PortRestrictedNAT : public NAT {
public:
  bool IsSymmetric() { return false; }
  bool FiltersIP() { return true; }
  bool FiltersPort() { return true; }
};

NAT* NAT::Create(NATType type) {
  switch (type) {
  case NAT_OPEN_CONE:       return new OpenConeNAT();
  case NAT_ADDR_RESTRICTED: return new AddressRestrictedNAT();
  case NAT_PORT_RESTRICTED: return new PortRestrictedNAT();
  case NAT_SYMMETRIC:       return new SymmetricNAT();
  default: assert(0);       return 0;
  }
}

} // namespace talk_base