//*****************************************************************************
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//
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//! \file dhcp.c
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//! \brief DHCP APIs implement file.
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//! \details Processig DHCP protocol as DISCOVER, OFFER, REQUEST, ACK, NACK and DECLINE.
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//! \version 1.1.0
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//! \date 2013/11/18
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//! \par Revision history
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//! <2013/11/18> 1st Release
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//! <2012/12/20> V1.1.0
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//! 1. Optimize code
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//! 2. Add reg_dhcp_cbfunc()
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//! 3. Add DHCP_stop()
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//! 4. Integrate check_DHCP_state() & DHCP_run() to DHCP_run()
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//! 5. Don't care system endian
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//! 6. Add comments
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//! <2012/12/26> V1.1.1
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//! 1. Modify variable declaration: dhcp_tick_1s is declared volatile for code optimization
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//! \author Eric Jung & MidnightCow
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//! \copyright
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//!
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//! Copyright (c) 2013, WIZnet Co., LTD.
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//! All rights reserved.
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//!
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//! Redistribution and use in source and binary forms, with or without
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//! modification, are permitted provided that the following conditions
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//! are met:
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//!
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//! * Redistributions of source code must retain the above copyright
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//! notice, this list of conditions and the following disclaimer.
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//! * Redistributions in binary form must reproduce the above copyright
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//! notice, this list of conditions and the following disclaimer in the
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//! documentation and/or other materials provided with the distribution.
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//! * Neither the name of the <ORGANIZATION> nor the names of its
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//! contributors may be used to endorse or promote products derived
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//! from this software without specific prior written permission.
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//!
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//! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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//! AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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//! IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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//! ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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//! LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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//! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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//! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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//! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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//! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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//! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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//! THE POSSIBILITY OF SUCH DAMAGE.
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//
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//*****************************************************************************
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#include "Ethernet/socket.h"
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#include "Internet/DHCP/dhcp.h"
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/* If you want to display debug & procssing message, Define _DHCP_DEBUG_ in dhcp.h */
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#ifdef _DHCP_DEBUG_
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#include <stdio.h>
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#endif
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/* DHCP state machine. */
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#define STATE_DHCP_INIT 0 ///< Initialize
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#define STATE_DHCP_DISCOVER 1 ///< send DISCOVER and wait OFFER
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#define STATE_DHCP_REQUEST 2 ///< send REQEUST and wait ACK or NACK
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#define STATE_DHCP_LEASED 3 ///< ReceiveD ACK and IP leased
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#define STATE_DHCP_REREQUEST 4 ///< send REQUEST for maintaining leased IP
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#define STATE_DHCP_RELEASE 5 ///< No use
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#define STATE_DHCP_STOP 6 ///< Stop procssing DHCP
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#define DHCP_FLAGSBROADCAST 0x8000 ///< The broadcast value of flags in @ref RIP_MSG
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#define DHCP_FLAGSUNICAST 0x0000 ///< The unicast value of flags in @ref RIP_MSG
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/* DHCP message OP code */
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#define DHCP_BOOTREQUEST 1 ///< Request Message used in op of @ref RIP_MSG
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#define DHCP_BOOTREPLY 2 ///< Reply Message used i op of @ref RIP_MSG
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/* DHCP message type */
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#define DHCP_DISCOVER 1 ///< DISCOVER message in OPT of @ref RIP_MSG
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#define DHCP_OFFER 2 ///< OFFER message in OPT of @ref RIP_MSG
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#define DHCP_REQUEST 3 ///< REQUEST message in OPT of @ref RIP_MSG
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#define DHCP_DECLINE 4 ///< DECLINE message in OPT of @ref RIP_MSG
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#define DHCP_ACK 5 ///< ACK message in OPT of @ref RIP_MSG
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#define DHCP_NAK 6 ///< NACK message in OPT of @ref RIP_MSG
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#define DHCP_RELEASE 7 ///< RELEASE message in OPT of @ref RIP_MSG. No use
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#define DHCP_INFORM 8 ///< INFORM message in OPT of @ref RIP_MSG. No use
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#define DHCP_HTYPE10MB 1 ///< Used in type of @ref RIP_MSG
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#define DHCP_HTYPE100MB 2 ///< Used in type of @ref RIP_MSG
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#define DHCP_HLENETHERNET 6 ///< Used in hlen of @ref RIP_MSG
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#define DHCP_HOPS 0 ///< Used in hops of @ref RIP_MSG
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#define DHCP_SECS 0 ///< Used in secs of @ref RIP_MSG
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#define INFINITE_LEASETIME 0xffffffff ///< Infinite lease time
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#define OPT_SIZE 312 /// Max OPT size of @ref RIP_MSG
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#define RIP_MSG_SIZE (236+OPT_SIZE) /// Max size of @ref RIP_MSG
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/*
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* @brief DHCP option and value (cf. RFC1533)
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*/
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enum
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{
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padOption = 0,
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subnetMask = 1,
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timerOffset = 2,
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routersOnSubnet = 3,
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timeServer = 4,
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nameServer = 5,
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dns = 6,
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logServer = 7,
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cookieServer = 8,
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lprServer = 9,
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impressServer = 10,
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resourceLocationServer = 11,
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hostName = 12,
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bootFileSize = 13,
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meritDumpFile = 14,
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domainName = 15,
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swapServer = 16,
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rootPath = 17,
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extentionsPath = 18,
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IPforwarding = 19,
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nonLocalSourceRouting = 20,
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policyFilter = 21,
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maxDgramReasmSize = 22,
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defaultIPTTL = 23,
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pathMTUagingTimeout = 24,
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pathMTUplateauTable = 25,
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ifMTU = 26,
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allSubnetsLocal = 27,
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broadcastAddr = 28,
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performMaskDiscovery = 29,
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maskSupplier = 30,
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performRouterDiscovery = 31,
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routerSolicitationAddr = 32,
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staticRoute = 33,
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trailerEncapsulation = 34,
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arpCacheTimeout = 35,
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ethernetEncapsulation = 36,
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tcpDefaultTTL = 37,
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tcpKeepaliveInterval = 38,
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tcpKeepaliveGarbage = 39,
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nisDomainName = 40,
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nisServers = 41,
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ntpServers = 42,
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vendorSpecificInfo = 43,
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netBIOSnameServer = 44,
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netBIOSdgramDistServer = 45,
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netBIOSnodeType = 46,
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netBIOSscope = 47,
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xFontServer = 48,
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xDisplayManager = 49,
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dhcpRequestedIPaddr = 50,
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dhcpIPaddrLeaseTime = 51,
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dhcpOptionOverload = 52,
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dhcpMessageType = 53,
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dhcpServerIdentifier = 54,
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dhcpParamRequest = 55,
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dhcpMsg = 56,
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dhcpMaxMsgSize = 57,
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dhcpT1value = 58,
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dhcpT2value = 59,
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dhcpClassIdentifier = 60,
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dhcpClientIdentifier = 61,
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endOption = 255
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};
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/*
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* @brief DHCP message format
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*/
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typedef struct {
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uint8_t op; ///< @ref DHCP_BOOTREQUEST or @ref DHCP_BOOTREPLY
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uint8_t htype; ///< @ref DHCP_HTYPE10MB or @ref DHCP_HTYPE100MB
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uint8_t hlen; ///< @ref DHCP_HLENETHERNET
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uint8_t hops; ///< @ref DHCP_HOPS
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uint32_t xid; ///< @ref DHCP_XID This increase one every DHCP transaction.
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uint16_t secs; ///< @ref DHCP_SECS
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uint16_t flags; ///< @ref DHCP_FLAGSBROADCAST or @ref DHCP_FLAGSUNICAST
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uint8_t ciaddr[4]; ///< @ref Request IP to DHCP sever
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uint8_t yiaddr[4]; ///< @ref Offered IP from DHCP server
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uint8_t siaddr[4]; ///< No use
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uint8_t giaddr[4]; ///< No use
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uint8_t chaddr[16]; ///< DHCP client 6bytes MAC address. Others is filled to zero
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uint8_t sname[64]; ///< No use
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uint8_t file[128]; ///< No use
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uint8_t OPT[OPT_SIZE]; ///< Option
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} RIP_MSG;
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uint8_t DHCP_SOCKET; // Socket number for DHCP
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uint8_t DHCP_SIP[4]; // DHCP Server IP address
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// Network information from DHCP Server
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uint8_t OLD_allocated_ip[4] = {0, }; // Previous IP address
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uint8_t DHCP_allocated_ip[4] = {0, }; // IP address from DHCP
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uint8_t DHCP_allocated_gw[4] = {0, }; // Gateway address from DHCP
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uint8_t DHCP_allocated_sn[4] = {0, }; // Subnet mask from DHCP
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uint8_t DHCP_allocated_dns[4] = {0, }; // DNS address from DHCP
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int8_t dhcp_state = STATE_DHCP_INIT; // DHCP state
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int8_t dhcp_retry_count = 0;
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uint32_t dhcp_lease_time = INFINITE_LEASETIME;
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volatile uint32_t dhcp_tick_1s = 0; // unit 1 second
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uint32_t dhcp_tick_next = DHCP_WAIT_TIME ;
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uint32_t DHCP_XID; // Any number
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RIP_MSG* pDHCPMSG; // Buffer pointer for DHCP processing
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uint8_t HOST_NAME[] = DCHP_HOST_NAME;
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uint8_t DHCP_CHADDR[6]; // DHCP Client MAC address.
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/* The default callback function */
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void default_ip_assign(void);
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void default_ip_update(void);
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void default_ip_conflict(void);
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/* Callback handler */
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void (*dhcp_ip_assign)(void) = default_ip_assign; /* handler to be called when the IP address from DHCP server is first assigned */
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void (*dhcp_ip_update)(void) = default_ip_update; /* handler to be called when the IP address from DHCP server is updated */
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void (*dhcp_ip_conflict)(void) = default_ip_conflict; /* handler to be called when the IP address from DHCP server is conflict */
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void reg_dhcp_cbfunc(void(*ip_assign)(void), void(*ip_update)(void), void(*ip_conflict)(void));
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/* send DISCOVER message to DHCP server */
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void send_DHCP_DISCOVER(void);
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/* send REQEUST message to DHCP server */
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void send_DHCP_REQUEST(void);
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/* send DECLINE message to DHCP server */
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void send_DHCP_DECLINE(void);
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/* IP conflict check by sending ARP-request to leased IP and wait ARP-response. */
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int8_t check_DHCP_leasedIP(void);
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/* check the timeout in DHCP process */
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uint8_t check_DHCP_timeout(void);
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/* Intialize to timeout process. */
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void reset_DHCP_timeout(void);
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/* Parse message as OFFER and ACK and NACK from DHCP server.*/
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int8_t parseDHCPCMSG(void);
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/* The default handler of ip assign first */
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void default_ip_assign(void)
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{
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setSIPR(DHCP_allocated_ip);
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setSUBR(DHCP_allocated_sn);
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setGAR (DHCP_allocated_gw);
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}
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/* The default handler of ip chaged */
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void default_ip_update(void)
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{
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/* WIZchip Software Reset */
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setMR(MR_RST);
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getMR(); // for delay
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default_ip_assign();
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setSHAR(DHCP_CHADDR);
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}
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/* The default handler of ip chaged */
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void default_ip_conflict(void)
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{
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// WIZchip Software Reset
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setMR(MR_RST);
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getMR(); // for delay
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setSHAR(DHCP_CHADDR);
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}
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/* register the call back func. */
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void reg_dhcp_cbfunc(void(*ip_assign)(void), void(*ip_update)(void), void(*ip_conflict)(void))
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{
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dhcp_ip_assign = default_ip_assign;
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dhcp_ip_update = default_ip_update;
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dhcp_ip_conflict = default_ip_conflict;
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if(ip_assign) dhcp_ip_assign = ip_assign;
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if(ip_update) dhcp_ip_update = ip_update;
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if(ip_conflict) dhcp_ip_conflict = ip_conflict;
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}
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/* make the common DHCP message */
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void makeDHCPMSG(void)
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{
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uint8_t bk_mac[6];
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uint8_t* ptmp;
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uint8_t i;
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getSHAR(bk_mac);
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pDHCPMSG->op = DHCP_BOOTREQUEST;
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pDHCPMSG->htype = DHCP_HTYPE10MB;
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pDHCPMSG->hlen = DHCP_HLENETHERNET;
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pDHCPMSG->hops = DHCP_HOPS;
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ptmp = (uint8_t*)(&pDHCPMSG->xid);
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*(ptmp+0) = (uint8_t)((DHCP_XID & 0xFF000000) >> 24);
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*(ptmp+1) = (uint8_t)((DHCP_XID & 0x00FF0000) >> 16);
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*(ptmp+2) = (uint8_t)((DHCP_XID & 0x0000FF00) >> 8);
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*(ptmp+3) = (uint8_t)((DHCP_XID & 0x000000FF) >> 0);
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pDHCPMSG->secs = DHCP_SECS;
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ptmp = (uint8_t*)(&pDHCPMSG->flags);
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*(ptmp+0) = (uint8_t)((DHCP_FLAGSBROADCAST & 0xFF00) >> 8);
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*(ptmp+1) = (uint8_t)((DHCP_FLAGSBROADCAST & 0x00FF) >> 0);
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pDHCPMSG->ciaddr[0] = 0;
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pDHCPMSG->ciaddr[1] = 0;
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pDHCPMSG->ciaddr[2] = 0;
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pDHCPMSG->ciaddr[3] = 0;
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pDHCPMSG->yiaddr[0] = 0;
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pDHCPMSG->yiaddr[1] = 0;
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pDHCPMSG->yiaddr[2] = 0;
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pDHCPMSG->yiaddr[3] = 0;
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pDHCPMSG->siaddr[0] = 0;
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pDHCPMSG->siaddr[1] = 0;
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pDHCPMSG->siaddr[2] = 0;
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pDHCPMSG->siaddr[3] = 0;
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pDHCPMSG->giaddr[0] = 0;
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pDHCPMSG->giaddr[1] = 0;
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pDHCPMSG->giaddr[2] = 0;
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pDHCPMSG->giaddr[3] = 0;
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pDHCPMSG->chaddr[0] = DHCP_CHADDR[0];
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pDHCPMSG->chaddr[1] = DHCP_CHADDR[1];
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pDHCPMSG->chaddr[2] = DHCP_CHADDR[2];
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pDHCPMSG->chaddr[3] = DHCP_CHADDR[3];
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pDHCPMSG->chaddr[4] = DHCP_CHADDR[4];
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pDHCPMSG->chaddr[5] = DHCP_CHADDR[5];
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for (i = 6; i < 16; i++) pDHCPMSG->chaddr[i] = 0;
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for (i = 0; i < 64; i++) pDHCPMSG->sname[i] = 0;
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for (i = 0; i < 128; i++) pDHCPMSG->file[i] = 0;
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// MAGIC_COOKIE
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pDHCPMSG->OPT[0] = (uint8_t)((MAGIC_COOKIE & 0xFF000000) >> 24);
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pDHCPMSG->OPT[1] = (uint8_t)((MAGIC_COOKIE & 0x00FF0000) >> 16);
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pDHCPMSG->OPT[2] = (uint8_t)((MAGIC_COOKIE & 0x0000FF00) >> 8);
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pDHCPMSG->OPT[3] = (uint8_t) (MAGIC_COOKIE & 0x000000FF) >> 0;
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}
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/* SEND DHCP DISCOVER */
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void send_DHCP_DISCOVER(void)
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{
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uint16_t i;
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uint8_t ip[4];
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uint16_t k = 0;
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makeDHCPMSG();
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k = 4; // beacaue MAGIC_COOKIE already made by makeDHCPMSG()
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// Option Request Param
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pDHCPMSG->OPT[k++] = dhcpMessageType;
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pDHCPMSG->OPT[k++] = 0x01;
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pDHCPMSG->OPT[k++] = DHCP_DISCOVER;
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// Client identifier
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pDHCPMSG->OPT[k++] = dhcpClientIdentifier;
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pDHCPMSG->OPT[k++] = 0x07;
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pDHCPMSG->OPT[k++] = 0x01;
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[0];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[1];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[2];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[3];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[4];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[5];
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// host name
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pDHCPMSG->OPT[k++] = hostName;
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pDHCPMSG->OPT[k++] = 0; // fill zero length of hostname
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for(i = 0 ; HOST_NAME[i] != 0; i++)
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pDHCPMSG->OPT[k++] = HOST_NAME[i];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[3];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[4];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[5];
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pDHCPMSG->OPT[k - (i+3+1)] = i+3; // length of hostname
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pDHCPMSG->OPT[k++] = dhcpParamRequest;
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pDHCPMSG->OPT[k++] = 0x06; // length of request
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pDHCPMSG->OPT[k++] = subnetMask;
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pDHCPMSG->OPT[k++] = routersOnSubnet;
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pDHCPMSG->OPT[k++] = dns;
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pDHCPMSG->OPT[k++] = domainName;
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pDHCPMSG->OPT[k++] = dhcpT1value;
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pDHCPMSG->OPT[k++] = dhcpT2value;
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pDHCPMSG->OPT[k++] = endOption;
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for (i = k; i < OPT_SIZE; i++) pDHCPMSG->OPT[i] = 0;
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// send broadcasting packet
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ip[0] = 255;
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ip[1] = 255;
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ip[2] = 255;
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ip[3] = 255;
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#ifdef _DHCP_DEBUG_
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printf("> Send DHCP_DISCOVER\r\n");
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#endif
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sendto(DHCP_SOCKET, (uint8_t *)pDHCPMSG, RIP_MSG_SIZE, ip, DHCP_SERVER_PORT);
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}
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/* SEND DHCP REQUEST */
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void send_DHCP_REQUEST(void)
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{
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int i;
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uint8_t ip[4];
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uint16_t k = 0;
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makeDHCPMSG();
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if(dhcp_state == STATE_DHCP_LEASED || dhcp_state == STATE_DHCP_REREQUEST)
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{
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*((uint8_t*)(&pDHCPMSG->flags)) = ((DHCP_FLAGSUNICAST & 0xFF00)>> 8);
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*((uint8_t*)(&pDHCPMSG->flags)+1) = (DHCP_FLAGSUNICAST & 0x00FF);
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pDHCPMSG->ciaddr[0] = DHCP_allocated_ip[0];
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pDHCPMSG->ciaddr[1] = DHCP_allocated_ip[1];
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pDHCPMSG->ciaddr[2] = DHCP_allocated_ip[2];
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pDHCPMSG->ciaddr[3] = DHCP_allocated_ip[3];
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ip[0] = DHCP_SIP[0];
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ip[1] = DHCP_SIP[1];
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ip[2] = DHCP_SIP[2];
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ip[3] = DHCP_SIP[3];
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}
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else
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{
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ip[0] = 255;
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ip[1] = 255;
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ip[2] = 255;
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ip[3] = 255;
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}
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k = 4; // beacaue MAGIC_COOKIE already made by makeDHCPMSG()
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// Option Request Param.
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pDHCPMSG->OPT[k++] = dhcpMessageType;
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pDHCPMSG->OPT[k++] = 0x01;
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pDHCPMSG->OPT[k++] = DHCP_REQUEST;
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pDHCPMSG->OPT[k++] = dhcpClientIdentifier;
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pDHCPMSG->OPT[k++] = 0x07;
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pDHCPMSG->OPT[k++] = 0x01;
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[0];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[1];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[2];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[3];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[4];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[5];
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if(ip[3] == 255) // if(dchp_state == STATE_DHCP_LEASED || dchp_state == DHCP_REREQUEST_STATE)
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{
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pDHCPMSG->OPT[k++] = dhcpRequestedIPaddr;
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pDHCPMSG->OPT[k++] = 0x04;
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pDHCPMSG->OPT[k++] = DHCP_allocated_ip[0];
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pDHCPMSG->OPT[k++] = DHCP_allocated_ip[1];
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pDHCPMSG->OPT[k++] = DHCP_allocated_ip[2];
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pDHCPMSG->OPT[k++] = DHCP_allocated_ip[3];
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pDHCPMSG->OPT[k++] = dhcpServerIdentifier;
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pDHCPMSG->OPT[k++] = 0x04;
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pDHCPMSG->OPT[k++] = DHCP_SIP[0];
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pDHCPMSG->OPT[k++] = DHCP_SIP[1];
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pDHCPMSG->OPT[k++] = DHCP_SIP[2];
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pDHCPMSG->OPT[k++] = DHCP_SIP[3];
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}
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// host name
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pDHCPMSG->OPT[k++] = hostName;
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pDHCPMSG->OPT[k++] = 0; // length of hostname
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for(i = 0 ; HOST_NAME[i] != 0; i++)
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pDHCPMSG->OPT[k++] = HOST_NAME[i];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[3];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[4];
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pDHCPMSG->OPT[k++] = DHCP_CHADDR[5];
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pDHCPMSG->OPT[k - (i+3+1)] = i+3; // length of hostname
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pDHCPMSG->OPT[k++] = dhcpParamRequest;
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pDHCPMSG->OPT[k++] = 0x08;
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pDHCPMSG->OPT[k++] = subnetMask;
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pDHCPMSG->OPT[k++] = routersOnSubnet;
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pDHCPMSG->OPT[k++] = dns;
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pDHCPMSG->OPT[k++] = domainName;
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pDHCPMSG->OPT[k++] = dhcpT1value;
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pDHCPMSG->OPT[k++] = dhcpT2value;
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pDHCPMSG->OPT[k++] = performRouterDiscovery;
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pDHCPMSG->OPT[k++] = staticRoute;
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pDHCPMSG->OPT[k++] = endOption;
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for (i = k; i < OPT_SIZE; i++) pDHCPMSG->OPT[i] = 0;
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|
#ifdef _DHCP_DEBUG_
|
printf("> Send DHCP_REQUEST\r\n");
|
#endif
|
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sendto(DHCP_SOCKET, (uint8_t *)pDHCPMSG, RIP_MSG_SIZE, ip, DHCP_SERVER_PORT);
|
|
}
|
|
/* SEND DHCP DHCPDECLINE */
|
void send_DHCP_DECLINE(void)
|
{
|
int i;
|
uint8_t ip[4];
|
uint16_t k = 0;
|
|
makeDHCPMSG();
|
|
k = 4; // beacaue MAGIC_COOKIE already made by makeDHCPMSG()
|
|
*((uint8_t*)(&pDHCPMSG->flags)) = ((DHCP_FLAGSUNICAST & 0xFF00)>> 8);
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*((uint8_t*)(&pDHCPMSG->flags)+1) = (DHCP_FLAGSUNICAST & 0x00FF);
|
|
// Option Request Param.
|
pDHCPMSG->OPT[k++] = dhcpMessageType;
|
pDHCPMSG->OPT[k++] = 0x01;
|
pDHCPMSG->OPT[k++] = DHCP_DECLINE;
|
|
pDHCPMSG->OPT[k++] = dhcpClientIdentifier;
|
pDHCPMSG->OPT[k++] = 0x07;
|
pDHCPMSG->OPT[k++] = 0x01;
|
pDHCPMSG->OPT[k++] = DHCP_CHADDR[0];
|
pDHCPMSG->OPT[k++] = DHCP_CHADDR[1];
|
pDHCPMSG->OPT[k++] = DHCP_CHADDR[2];
|
pDHCPMSG->OPT[k++] = DHCP_CHADDR[3];
|
pDHCPMSG->OPT[k++] = DHCP_CHADDR[4];
|
pDHCPMSG->OPT[k++] = DHCP_CHADDR[5];
|
|
pDHCPMSG->OPT[k++] = dhcpRequestedIPaddr;
|
pDHCPMSG->OPT[k++] = 0x04;
|
pDHCPMSG->OPT[k++] = DHCP_allocated_ip[0];
|
pDHCPMSG->OPT[k++] = DHCP_allocated_ip[1];
|
pDHCPMSG->OPT[k++] = DHCP_allocated_ip[2];
|
pDHCPMSG->OPT[k++] = DHCP_allocated_ip[3];
|
|
pDHCPMSG->OPT[k++] = dhcpServerIdentifier;
|
pDHCPMSG->OPT[k++] = 0x04;
|
pDHCPMSG->OPT[k++] = DHCP_SIP[0];
|
pDHCPMSG->OPT[k++] = DHCP_SIP[1];
|
pDHCPMSG->OPT[k++] = DHCP_SIP[2];
|
pDHCPMSG->OPT[k++] = DHCP_SIP[3];
|
|
pDHCPMSG->OPT[k++] = endOption;
|
|
for (i = k; i < OPT_SIZE; i++) pDHCPMSG->OPT[i] = 0;
|
|
//send broadcasting packet
|
ip[0] = 0xFF;
|
ip[1] = 0xFF;
|
ip[2] = 0xFF;
|
ip[3] = 0xFF;
|
|
#ifdef _DHCP_DEBUG_
|
printf("\r\n> Send DHCP_DECLINE\r\n");
|
#endif
|
|
sendto(DHCP_SOCKET, (uint8_t *)pDHCPMSG, RIP_MSG_SIZE, ip, DHCP_SERVER_PORT);
|
}
|
|
/* PARSE REPLY pDHCPMSG */
|
int8_t parseDHCPMSG(void)
|
{
|
uint8_t svr_addr[6];
|
uint16_t svr_port;
|
uint16_t len;
|
|
uint8_t * p;
|
uint8_t * e;
|
uint8_t type;
|
uint8_t opt_len;
|
|
if((len = getSn_RX_RSR(DHCP_SOCKET)) > 0)
|
{
|
len = recvfrom(DHCP_SOCKET, (uint8_t *)pDHCPMSG, len, svr_addr, &svr_port);
|
#ifdef _DHCP_DEBUG_
|
printf("DHCP message : %d.%d.%d.%d(%d) %d received. \r\n",svr_addr[0],svr_addr[1],svr_addr[2], svr_addr[3],svr_port, len);
|
#endif
|
}
|
else return 0;
|
if (svr_port == DHCP_SERVER_PORT) {
|
// compare mac address
|
if ( (pDHCPMSG->chaddr[0] != DHCP_CHADDR[0]) || (pDHCPMSG->chaddr[1] != DHCP_CHADDR[1]) ||
|
(pDHCPMSG->chaddr[2] != DHCP_CHADDR[2]) || (pDHCPMSG->chaddr[3] != DHCP_CHADDR[3]) ||
|
(pDHCPMSG->chaddr[4] != DHCP_CHADDR[4]) || (pDHCPMSG->chaddr[5] != DHCP_CHADDR[5]) )
|
return 0;
|
type = 0;
|
p = (uint8_t *)(&pDHCPMSG->op);
|
p = p + 240; // 240 = sizeof(RIP_MSG) + MAGIC_COOKIE size in RIP_MSG.opt - sizeof(RIP_MSG.opt)
|
e = p + (len - 240);
|
|
while ( p < e ) {
|
|
switch ( *p ) {
|
|
case endOption :
|
p = e; // for break while(p < e)
|
break;
|
case padOption :
|
p++;
|
break;
|
case dhcpMessageType :
|
p++;
|
p++;
|
type = *p++;
|
break;
|
case subnetMask :
|
p++;
|
p++;
|
DHCP_allocated_sn[0] = *p++;
|
DHCP_allocated_sn[1] = *p++;
|
DHCP_allocated_sn[2] = *p++;
|
DHCP_allocated_sn[3] = *p++;
|
break;
|
case routersOnSubnet :
|
p++;
|
opt_len = *p++;
|
DHCP_allocated_gw[0] = *p++;
|
DHCP_allocated_gw[1] = *p++;
|
DHCP_allocated_gw[2] = *p++;
|
DHCP_allocated_gw[3] = *p++;
|
p = p + (opt_len - 4);
|
break;
|
case dns :
|
p++;
|
opt_len = *p++;
|
DHCP_allocated_dns[0] = *p++;
|
DHCP_allocated_dns[1] = *p++;
|
DHCP_allocated_dns[2] = *p++;
|
DHCP_allocated_dns[3] = *p++;
|
p = p + (opt_len - 4);
|
break;
|
case dhcpIPaddrLeaseTime :
|
p++;
|
opt_len = *p++;
|
dhcp_lease_time = *p++;
|
dhcp_lease_time = (dhcp_lease_time << 8) + *p++;
|
dhcp_lease_time = (dhcp_lease_time << 8) + *p++;
|
dhcp_lease_time = (dhcp_lease_time << 8) + *p++;
|
#ifdef _DHCP_DEBUG_
|
dhcp_lease_time = 10;
|
#endif
|
break;
|
case dhcpServerIdentifier :
|
p++;
|
opt_len = *p++;
|
DHCP_SIP[0] = *p++;
|
DHCP_SIP[1] = *p++;
|
DHCP_SIP[2] = *p++;
|
DHCP_SIP[3] = *p++;
|
break;
|
default :
|
p++;
|
opt_len = *p++;
|
p += opt_len;
|
break;
|
} // switch
|
} // while
|
} // if
|
return type;
|
}
|
|
uint8_t DHCP_run(void)
|
{
|
uint8_t type;
|
uint8_t ret;
|
|
if(dhcp_state == STATE_DHCP_STOP) return DHCP_STOPPED;
|
|
if(getSn_SR(DHCP_SOCKET) != SOCK_UDP)
|
socket(DHCP_SOCKET, Sn_MR_UDP, DHCP_CLIENT_PORT, 0x00);
|
|
ret = DHCP_RUNNING;
|
type = parseDHCPMSG();
|
|
switch ( dhcp_state ) {
|
case STATE_DHCP_INIT :
|
DHCP_allocated_ip[0] = 0;
|
DHCP_allocated_ip[1] = 0;
|
DHCP_allocated_ip[2] = 0;
|
DHCP_allocated_ip[3] = 0;
|
send_DHCP_DISCOVER();
|
dhcp_state = STATE_DHCP_DISCOVER;
|
break;
|
case STATE_DHCP_DISCOVER :
|
if (type == DHCP_OFFER){
|
#ifdef _DHCP_DEBUG_
|
printf("> Receive DHCP_OFFER\r\n");
|
#endif
|
DHCP_allocated_ip[0] = pDHCPMSG->yiaddr[0];
|
DHCP_allocated_ip[1] = pDHCPMSG->yiaddr[1];
|
DHCP_allocated_ip[2] = pDHCPMSG->yiaddr[2];
|
DHCP_allocated_ip[3] = pDHCPMSG->yiaddr[3];
|
|
send_DHCP_REQUEST();
|
dhcp_state = STATE_DHCP_REQUEST;
|
} else ret = check_DHCP_timeout();
|
break;
|
|
case STATE_DHCP_REQUEST :
|
if (type == DHCP_ACK) {
|
|
#ifdef _DHCP_DEBUG_
|
printf("> Receive DHCP_ACK\r\n");
|
#endif
|
if (check_DHCP_leasedIP()) {
|
// Network info assignment from DHCP
|
dhcp_ip_assign();
|
reset_DHCP_timeout();
|
|
dhcp_state = STATE_DHCP_LEASED;
|
} else {
|
// IP address conflict occurred
|
reset_DHCP_timeout();
|
dhcp_ip_conflict();
|
dhcp_state = STATE_DHCP_INIT;
|
}
|
} else if (type == DHCP_NAK) {
|
|
#ifdef _DHCP_DEBUG_
|
printf("> Receive DHCP_NACK\r\n");
|
#endif
|
|
reset_DHCP_timeout();
|
|
dhcp_state = STATE_DHCP_DISCOVER;
|
} else ret = check_DHCP_timeout();
|
break;
|
|
case STATE_DHCP_LEASED :
|
ret = DHCP_IP_LEASED;
|
if ((dhcp_lease_time != INFINITE_LEASETIME) && ((dhcp_lease_time/2) < dhcp_tick_1s)) {
|
|
#ifdef _DHCP_DEBUG_
|
printf("> Maintains the IP address \r\n");
|
#endif
|
|
type = 0;
|
OLD_allocated_ip[0] = DHCP_allocated_ip[0];
|
OLD_allocated_ip[1] = DHCP_allocated_ip[1];
|
OLD_allocated_ip[2] = DHCP_allocated_ip[2];
|
OLD_allocated_ip[3] = DHCP_allocated_ip[3];
|
|
DHCP_XID++;
|
|
send_DHCP_REQUEST();
|
|
reset_DHCP_timeout();
|
|
dhcp_state = STATE_DHCP_REREQUEST;
|
}
|
break;
|
|
case STATE_DHCP_REREQUEST :
|
ret = DHCP_IP_LEASED;
|
if (type == DHCP_ACK) {
|
dhcp_retry_count = 0;
|
if (OLD_allocated_ip[0] != DHCP_allocated_ip[0] ||
|
OLD_allocated_ip[1] != DHCP_allocated_ip[1] ||
|
OLD_allocated_ip[2] != DHCP_allocated_ip[2] ||
|
OLD_allocated_ip[3] != DHCP_allocated_ip[3])
|
{
|
ret = DHCP_IP_CHANGED;
|
dhcp_ip_update();
|
#ifdef _DHCP_DEBUG_
|
printf(">IP changed.\r\n");
|
#endif
|
|
}
|
#ifdef _DHCP_DEBUG_
|
else printf(">IP is continued.\r\n");
|
#endif
|
reset_DHCP_timeout();
|
dhcp_state = STATE_DHCP_LEASED;
|
} else if (type == DHCP_NAK) {
|
|
#ifdef _DHCP_DEBUG_
|
printf("> Receive DHCP_NACK, Failed to maintain ip\r\n");
|
#endif
|
|
reset_DHCP_timeout();
|
|
dhcp_state = STATE_DHCP_DISCOVER;
|
} else ret = check_DHCP_timeout();
|
break;
|
default :
|
break;
|
}
|
|
return ret;
|
}
|
|
void DHCP_stop(void)
|
{
|
close(DHCP_SOCKET);
|
dhcp_state = STATE_DHCP_STOP;
|
}
|
|
uint8_t check_DHCP_timeout(void)
|
{
|
uint8_t ret = DHCP_RUNNING;
|
|
if (dhcp_retry_count < MAX_DHCP_RETRY) {
|
if (dhcp_tick_next < dhcp_tick_1s) {
|
|
switch ( dhcp_state ) {
|
case STATE_DHCP_DISCOVER :
|
// printf("<<timeout>> state : STATE_DHCP_DISCOVER\r\n");
|
send_DHCP_DISCOVER();
|
break;
|
|
case STATE_DHCP_REQUEST :
|
// printf("<<timeout>> state : STATE_DHCP_REQUEST\r\n");
|
|
send_DHCP_REQUEST();
|
break;
|
|
case STATE_DHCP_REREQUEST :
|
// printf("<<timeout>> state : STATE_DHCP_REREQUEST\r\n");
|
|
send_DHCP_REQUEST();
|
break;
|
|
default :
|
break;
|
}
|
|
dhcp_tick_1s = 0;
|
dhcp_tick_next = dhcp_tick_1s + DHCP_WAIT_TIME;
|
dhcp_retry_count++;
|
}
|
} else { // timeout occurred
|
|
switch(dhcp_state) {
|
case STATE_DHCP_DISCOVER:
|
dhcp_state = STATE_DHCP_INIT;
|
ret = DHCP_FAILED;
|
break;
|
case STATE_DHCP_REQUEST:
|
case STATE_DHCP_REREQUEST:
|
send_DHCP_DISCOVER();
|
dhcp_state = STATE_DHCP_DISCOVER;
|
break;
|
default :
|
break;
|
}
|
reset_DHCP_timeout();
|
}
|
return ret;
|
}
|
|
int8_t check_DHCP_leasedIP(void)
|
{
|
uint8_t tmp;
|
int32_t ret;
|
|
//WIZchip RCR value changed for ARP Timeout count control
|
tmp = getRCR();
|
setRCR(0x03);
|
|
// IP conflict detection : ARP request - ARP reply
|
// Broadcasting ARP Request for check the IP conflict using UDP sendto() function
|
ret = sendto(DHCP_SOCKET, (uint8_t *)"CHECK_IP_CONFLICT", 17, DHCP_allocated_ip, 5000);
|
|
// RCR value restore
|
setRCR(tmp);
|
|
if(ret == SOCKERR_TIMEOUT) {
|
// UDP send Timeout occurred : allocated IP address is unique, DHCP Success
|
|
#ifdef _DHCP_DEBUG_
|
printf("\r\n> Check leased IP - OK\r\n");
|
#endif
|
|
return 1;
|
} else {
|
// Received ARP reply or etc : IP address conflict occur, DHCP Failed
|
send_DHCP_DECLINE();
|
|
ret = dhcp_tick_1s;
|
while((dhcp_tick_1s - ret) < 2) ; // wait for 1s over; wait to complete to send DECLINE message;
|
|
return 0;
|
}
|
}
|
|
void DHCP_init(uint8_t s, uint8_t * buf)
|
{
|
uint8_t zeroip[4] = {0,0,0,0};
|
getSHAR(DHCP_CHADDR);
|
if((DHCP_CHADDR[0] | DHCP_CHADDR[1] | DHCP_CHADDR[2] | DHCP_CHADDR[3] | DHCP_CHADDR[4] | DHCP_CHADDR[5]) == 0x00)
|
{
|
// assing temporary mac address, you should be set SHAR before call this function.
|
DHCP_CHADDR[0] = 0x00;
|
DHCP_CHADDR[1] = 0x08;
|
DHCP_CHADDR[2] = 0xdc;
|
DHCP_CHADDR[3] = 0x00;
|
DHCP_CHADDR[4] = 0x00;
|
DHCP_CHADDR[5] = 0x00;
|
setSHAR(DHCP_CHADDR);
|
}
|
|
DHCP_SOCKET = s; // SOCK_DHCP
|
pDHCPMSG = (RIP_MSG*)buf;
|
DHCP_XID = 0x12345678;
|
|
// WIZchip Netinfo Clear
|
setSIPR(zeroip);
|
setSIPR(zeroip);
|
setGAR(zeroip);
|
|
reset_DHCP_timeout();
|
dhcp_state = STATE_DHCP_INIT;
|
}
|
|
|
/* Rset the DHCP timeout count and retry count. */
|
void reset_DHCP_timeout(void)
|
{
|
dhcp_tick_1s = 0;
|
dhcp_tick_next = DHCP_WAIT_TIME;
|
dhcp_retry_count = 0;
|
}
|
|
void DHCP_time_handler(void)
|
{
|
dhcp_tick_1s++;
|
}
|
|
void getIPfromDHCP(uint8_t* ip)
|
{
|
ip[0] = DHCP_allocated_ip[0];
|
ip[1] = DHCP_allocated_ip[1];
|
ip[2] = DHCP_allocated_ip[2];
|
ip[3] = DHCP_allocated_ip[3];
|
}
|
|
void getGWfromDHCP(uint8_t* ip)
|
{
|
ip[0] =DHCP_allocated_gw[0];
|
ip[1] =DHCP_allocated_gw[1];
|
ip[2] =DHCP_allocated_gw[2];
|
ip[3] =DHCP_allocated_gw[3];
|
}
|
|
void getSNfromDHCP(uint8_t* ip)
|
{
|
ip[0] = DHCP_allocated_sn[0];
|
ip[1] = DHCP_allocated_sn[1];
|
ip[2] = DHCP_allocated_sn[2];
|
ip[3] = DHCP_allocated_sn[3];
|
}
|
|
void getDNSfromDHCP(uint8_t* ip)
|
{
|
ip[0] = DHCP_allocated_dns[0];
|
ip[1] = DHCP_allocated_dns[1];
|
ip[2] = DHCP_allocated_dns[2];
|
ip[3] = DHCP_allocated_dns[3];
|
}
|
|
uint32_t getDHCPLeasetime(void)
|
{
|
return dhcp_lease_time;
|
}
|
|
|
|
|
