Arduino/hardware/avr/libraries/Ethernet/Ethernet.h

#ifndef ethernet_h
#define ethernet_h

#include <inttypes.h>
//#include "w5100.h"
#include "IPAddress.h"
#include "Client.h"
#include "Server.h"

#define MAX_SOCK_NUM 4

class EthernetClass {
private:
  IPAddress _dnsServerAddress;
public:
  static uint8_t _state[MAX_SOCK_NUM];
  static uint16_t _server_port[MAX_SOCK_NUM];
  // Initialise the Ethernet shield to use the provided MAC address and gain the rest of the
  // configuration through DHCP.
  // Returns 0 if the DHCP configuration failed, and 1 if it succeeded
  int begin(uint8_t *mac_address);
  void begin(uint8_t *mac_address, IPAddress local_ip);
  void begin(uint8_t *mac_address, IPAddress local_ip, IPAddress gateway);
  void begin(uint8_t *mac_address, IPAddress local_ip, IPAddress gateway, IPAddress subnet);

  IPAddress localIP();
  IPAddress subnetMask();
  IPAddress gatewayIP();
  IPAddress dnsServerIP();

  friend class Client;
  friend class Server;
};

extern EthernetClass Ethernet;

#endif