DHCP.hh

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#ifndef COSA_DHCP_HH
#define COSA_DHCP_HH

#include "Cosa/Types.h"
#include "Cosa/Socket.hh"

class DHCP {
public:
  static const uint16_t PORT = 68;

  DHCP(const char* hostname, const uint8_t* mac);

  bool begin(Socket* sock);

  bool end();

  int discover();

  int request(uint8_t ip[4], uint8_t subnet[4], uint8_t gateway[4]);

  int renew(Socket* sock);

  int release(Socket* sock);

  uint32_t lease_obtained() const
  {
    return (m_lease_obtained);
  }

  uint32_t lease_expires() const
  {
    return (m_lease_expires);
  }

  const uint8_t* dhcp_addr() const
  {
    return (m_dhcp);
  }

  const uint8_t* dns_addr() const
  {
    return (m_dns);
  }

  const uint8_t* gateway_addr() const
  {
    return (m_gateway);
  }

private:
  enum {
    REQUEST = 1,
    REPLY = 2
  } __attribute__((packed));

  enum {
    HTYPE_10MB = 1,
    HTYPE_100MB = 2,
    HLEN_ETHERNET = 6,
    FLAGS_BROADCAST = 0x8000
  };

  struct header_t {
    uint8_t OP;                 
    uint8_t HTYPE;              
    uint8_t HLEN;               
    uint8_t HOPS;               
    uint32_t XID;               
    uint16_t SECS;              
    uint16_t FLAGS;             
    uint8_t CIADDR[4];          
    uint8_t YIADDR[4];          
    uint8_t SIADDR[4];          
    uint8_t GIADDR[4];          
    uint8_t CHADDRB[16];        
#ifdef BOOTP_SECTION            
    uint8_t SNAME[64];          
    uint8_t FILE[128];          
#endif
  };

  static const uint32_t MAGIC_COOKIE = 0x63825363;

  enum {
    PAD_OPTION = 0,
    SUBNET_MASK = 1,
    TIMER_OFFSET = 2,
    ROUTERS_ON_SUBNET = 3,
    DNS_SERVER = 6,
    HOSTNAME = 12,
    DOMAIN_NAME = 15,
    REQUESTED_IP_ADDR = 50,
    IP_ADDR_LEASE_TIME = 51,
    MESSAGE_TYPE = 53,
    SERVER_IDENTIFIER = 54,
    PARAM_REQUEST = 55,
    T1_VALUE = 58,
    T2_VALUE = 59,
    CLIENT_IDENTIFIER = 61,
    END_OPTION = 255
  } __attribute__((packed));

  enum {
    DHCP_DISCOVER = 1,
    DHCP_OFFER = 2,
    DHCP_REQUEST = 3,
    DHCP_DECLINE = 4,
    DHCP_ACK = 5,
    DHCP_NAK = 6,
    DHCP_RELEASE = 7,
    DHCP_INFORM = 8
  } __attribute__((packed));

  uint8_t m_dhcp[4];

  uint8_t m_gateway[4];

  uint8_t m_dns[4];

  uint8_t m_ip[4];

  uint8_t m_subnet[4];

  const char* m_hostname;

  const uint8_t* m_mac;

  Socket* m_sock;

  uint32_t m_lease_obtained;

  uint32_t m_lease_expires;

  static const uint16_t SERVER_PORT = 67;

  int send(uint8_t type);

  int recv(uint8_t type, uint16_t ms = 2000);
};

#endif