NetClientDhcp.hpp

//------------------------------------------------------------------------------
//This file is part of embKernel. 
//See license.txt for the full license governing this code.
//------------------------------------------------------------------------------

#ifndef NET_CLIENT_DHCP_HPP_
#define NET_CLIENT_DHCP_HPP_

#include "NetDefs.hpp"

class NetClientDhcp {
    friend class Net;
    friend class NetUdp;
private:
    typedef enum {
        MSG_UNKNOWN = 0,
        MSG_DISCOVER = 1,
        MSG_OFFER = 2,
        MSG_REQUEST = 3,
        MSG_DECLINE = 4,
        MSG_ACK = 5,
        MSG_NAK = 6,
        MSG_RELEASE = 7,
        MSG_INFORM
    } MSG_TYPE;

    typedef enum {
        OPT_MESSAGE_PAD = 0,
        OPT_SUBNET_MASK = 1,
        OPT_ROUTER = 3,
        OPT_DNS = 6,
        OPT_HOST_NAME = 12,
        OPT_REQUESTED_IP_ADDRESS = 50,
        OPT_IP_LEASE_TIME = 51,
        OPT_DHCP_MESSAGE_TYPE = 53,
        OPT_SERVER_IDENTIFIER = 54,
        OPT_PARAM_REQUEST_LIST = 55,
        OPT_CLIENT_IDENTIFIER = 61,
        OPT_END = 255
    } MSG_OPT;

    typedef enum {
        STATE_DISABLED = 0,
        STATE_INIT,
        STATE_WAIT_OFFER,
        STATE_WAIT_ACK,
        STATE_BOUND
    } STATE;

    static STATE sState;
    static uint32_t sTransactionId;
    static NetDefs::IP_ADDR sOfferedYourIpAddr;
    static NetDefs::IP_ADDR sOfferedMask;
    static NetDefs::IP_ADDR sOfferedServerIpAddr;
    static NetDefs::IP_ADDR sOfferedGatewayIpAddr;
    static NetDefs::IP_ADDR sOfferedDnsIpAddr;
    static uint32_t sLeaseTime;
    static uint32_t sTimeout;

    static void processFrame(NetDefs::FRAME& frame, NetDefs::DHCP_HEADER& header, int len);
    static bool sendMessage(MSG_TYPE type);
    static bool parseMsg(NetDefs::FRAME& frame, NetDefs::DHCP_HEADER& header, MSG_TYPE& msgType, int len);
    static uint8_t* writeOption(uint8_t* dst, MSG_OPT option, const uint8_t* parameters, int len);
    static void tick();
    static void swapHeader(NetDefs::DHCP_HEADER& header);
};

#endif /* NET_CLIENT_DHCP_HPP_ */