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hedin |
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/*********************************************************************
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*
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* DHCP Module for Microchip TCP/IP Stack
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*
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*********************************************************************
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* FileName: DHCP.c
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* Dependencies: StackTsk.h
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* UDP.h
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* Processor: PIC18
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* Complier: MCC18 v1.00.50 or higher
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* HITECH PICC-18 V8.10PL1 or higher
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* Company: Microchip Technology, Inc.
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*
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* Software License Agreement
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*
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* The software supplied herewith by Microchip Technology Incorporated
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* (the “Company”) for its PICmicro® Microcontroller is intended and
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* supplied to you, the Company’s customer, for use solely and
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* exclusively on Microchip PICmicro Microcontroller products. The
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* software is owned by the Company and/or its supplier, and is
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* protected under applicable copyright laws. All rights are reserved.
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* Any use in violation of the foregoing restrictions may subject the
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* user to criminal sanctions under applicable laws, as well as to
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* civil liability for the breach of the terms and conditions of this
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* license.
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*
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* THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES,
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* WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
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* TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,
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* IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
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* CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
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*
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* HiTech PICC18 Compiler Options excluding device selection:
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* -FAKELOCAL -G -Zg -E -C
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*
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* Author Date Comment
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*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* Nilesh Rajbharti 3/21/01 Original (Rev 1.0)
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* Nilesh Rajbharti 7/10/02 Explicitly initialized tempIPAddress
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* (Rev 2.11)
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* Nilesh Rajbharti 5/16/03 Increased DHCP_TIMEOUT to 2 seconds.
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* Nilesh Rajbharti 5/16/03 Fixed SM_DHCP_BROADCAST logic
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* where UDPPut was called before setting
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* active socket.
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* Robert Sloan 5/29/03 Improved DHCP State machine to handle
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* NAK and renew existing IP address.
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* Nilesh Rajbharti 8/15/03 Modified _DHCPRecieve() to check for
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* chaddr field before accpting the packet.
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* Fixed DHCPTask() where it would not
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* reply to first OFFER.
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********************************************************************/
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#define THIS_IS_DHCP
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#include "stacktsk.h"
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#include "dhcp.h"
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#include "udp.h"
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#include "tick.h"
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#if !defined(STACK_USE_DHCP)
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#error DHCP module is not enabled.
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#error If you do not want DHCP module, remove this file from your
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#error project to reduce your code size.
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#error If you do want DHCP module, make sure that STACK_USE_DHCP
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#error is defined in StackTsk.h file.
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#endif
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#if defined(STACK_USE_SIIP)
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#error DHCP module is not available when SLIP is used.
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#endif
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#define DHCP_TIMEOUT (TICK)(2L * TICK_SECOND)
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#define DHCP_CLIENT_PORT (68)
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#define DHCP_SERVER_PORT (67)
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#define BOOT_REQUEST (1)
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#define BOOT_REPLY (2)
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#define HW_TYPE (1)
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#define LEN_OF_HW_TYPE (6)
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#define DHCP_MESSAGE_TYPE (53)
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#define DHCP_MESSAGE_TYPE_LEN (1)
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#define DHCP_UNKNOWN_MESSAGE (0)
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#define DHCP_DISCOVER_MESSAGE (1)
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#define DHCP_OFFER_MESSAGE (2)
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#define DHCP_REQUEST_MESSAGE (3)
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#define DHCP_DECLINE_MESSAGE (4)
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#define DHCP_ACK_MESSAGE (5)
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#define DHCP_NAK_MESSAGE (6)
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#define DHCP_RELEASE_MESSAGE (7)
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#define DHCP_SERVER_IDENTIFIER (54)
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#define DHCP_SERVER_IDENTIFIER_LEN (4)
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#define DHCP_PARAM_REQUEST_LIST (55)
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#define DHCP_PARAM_REQUEST_LIST_LEN (2)
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#define DHCP_PARAM_REQUEST_IP_ADDRESS (50)
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#define DHCP_PARAM_REQUEST_IP_ADDRESS_LEN (4)
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#define DHCP_SUBNET_MASK (1)
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#define DHCP_ROUTER (3)
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#define DHCP_IP_LEASE_TIME (51)
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#define DHCP_END_OPTION (255)
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#define HALF_HOUR (WORD)((WORD)60 * (WORD)30)
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SM_DHCP smDHCPState = SM_DHCP_INIT;
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static UDP_SOCKET DHCPSocket = INVALID_UDP_SOCKET;
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DHCP_STATE DHCPState = { 0x00 };
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static DWORD_VAL DHCPServerID;
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static DWORD_VAL DHCPLeaseTime;
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static IP_ADDR tempIPAddress;
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static IP_ADDR tempGateway;
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static IP_ADDR tempMask;
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static BYTE _DHCPReceive(void);
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static void _DHCPSend(BYTE messageType);
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BYTE DHCPBindCount = 0;
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/*
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* Uncomment following line if DHCP transactions are to be displayed on
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* RS-232 - for debug purpose only.
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*/
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//#define DHCP_DEBUG_MODE
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#if defined(DHCP_DEBUG_MODE)
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static USARTPut(BYTE c)
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{
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while( !TXSTA_TRMT);
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TXREG = c;
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}
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#else
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#define USARTPut(a)
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#endif
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void DHCPReset(void)
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{
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// Do not reset DHCP if it was previously disabled.
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if ( smDHCPState == SM_DHCP_DISABLED )
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return;
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if ( DHCPSocket != INVALID_UDP_SOCKET )
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UDPClose(DHCPSocket);
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DHCPSocket = INVALID_UDP_SOCKET;
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smDHCPState = SM_DHCP_INIT;
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DHCPBindCount = 0;
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}
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/*********************************************************************
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* Function: void DHCPTask(void)
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*
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* PreCondition: DHCPInit() is already called AND
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* IPGetHeader() is called with
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* IPFrameType == IP_PROT_UDP
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*
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* Input: None
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*
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* Output: None
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*
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* Side Effects: None
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*
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* Overview: Fetches pending UDP packet from MAC receive buffer
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* and dispatches it appropriate UDP socket.
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* If not UDP socket is matched, UDP packet is
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* silently discarded.
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*
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* Note: Caller must make sure that MAC receive buffer
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* access pointer is set to begining of UDP packet.
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* Required steps before calling this function is:
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*
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* If ( MACIsRxReady() )
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* {
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* MACGetHeader()
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* If MACFrameType == IP
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* IPGetHeader()
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* if ( IPFrameType == IP_PROT_UDP )
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* Call DHCPTask()
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* ...
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********************************************************************/
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void DHCPTask(void)
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{
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NODE_INFO DHCPServerNode;
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static TICK lastTryTick;
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BYTE DHCPRecvReturnValue;
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switch(smDHCPState)
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{
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case SM_DHCP_INIT:
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DHCPServerNode.MACAddr.v[0] = 0xff;
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DHCPServerNode.MACAddr.v[1] = 0xff;
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DHCPServerNode.MACAddr.v[2] = 0xff;
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DHCPServerNode.MACAddr.v[3] = 0xff;
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DHCPServerNode.MACAddr.v[4] = 0xff;
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DHCPServerNode.MACAddr.v[5] = 0xff;
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DHCPServerNode.IPAddr.Val = 0xffffffff;
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tempIPAddress.Val = 0x0;
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DHCPSocket = UDPOpen(DHCP_CLIENT_PORT,
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&DHCPServerNode,
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DHCP_SERVER_PORT);
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lastTryTick = TickGet();
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smDHCPState = SM_DHCP_RESET_WAIT;
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/* No break */
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case SM_DHCP_RESET_WAIT:
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if ( TickGetDiff(TickGet(), lastTryTick) >= (TICK_SECOND/(TICK)5) )
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smDHCPState = SM_DHCP_BROADCAST;
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break;
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case SM_DHCP_BROADCAST:
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/*
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* If we have already obtained some IP address, renew it.
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*/
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if ( tempIPAddress.Val != 0x00000 )
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{
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smDHCPState = SM_DHCP_REQUEST;
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}
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else if ( UDPIsPutReady(DHCPSocket) )
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{
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/*
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* To minimize code requirement, user must make sure that
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* above call will be successful by making at least one
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* UDP socket available.
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* Usually this will be the case, given that DHCP will be
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* the first one to use UDP socket.
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*
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* Also, we will not check for transmitter readiness,
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* we assume it to be ready.
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*/
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_DHCPSend(DHCP_DISCOVER_MESSAGE);
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// DEBUG
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USARTPut('\n');
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USARTPut('\r');
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USARTPut('D');
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lastTryTick = TickGet();
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smDHCPState = SM_DHCP_DISCOVER;
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}
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break;
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case SM_DHCP_DISCOVER:
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if ( TickGetDiff(TickGet(), lastTryTick) >= DHCP_TIMEOUT )
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{
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smDHCPState = SM_DHCP_BROADCAST;
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//return;
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}
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if ( UDPIsGetReady(DHCPSocket) )
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{
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// DEBUG
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USARTPut('R');
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if ( _DHCPReceive() == DHCP_OFFER_MESSAGE )
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{
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// DEBUG
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USARTPut('O');
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smDHCPState = SM_DHCP_REQUEST;
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}
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else
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break;
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}
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else
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break;
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case SM_DHCP_REQUEST:
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if ( UDPIsPutReady(DHCPSocket) )
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{
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_DHCPSend(DHCP_REQUEST_MESSAGE);
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| 290 |
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lastTryTick = TickGet();
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smDHCPState = SM_DHCP_BIND;
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}
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break;
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case SM_DHCP_BIND:
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if ( UDPIsGetReady(DHCPSocket) )
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{
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| 298 |
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DHCPRecvReturnValue = _DHCPReceive();
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if ( DHCPRecvReturnValue == DHCP_NAK_MESSAGE )
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{
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| 301 |
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// (RSS) NAK recieved. DHCP server didn't like our DHCP Request format
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USARTPut('n');
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smDHCPState = SM_DHCP_REQUEST; // Request again
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}
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else if ( DHCPRecvReturnValue == DHCP_ACK_MESSAGE )
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{
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| 307 |
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// DEBUG
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| 308 |
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USARTPut('B');
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| 309 |
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| 310 |
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/*
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| 311 |
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* Once DCHP is successful, release the UDP socket
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| 312 |
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* This will ensure that UDP layer discards any further
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| 313 |
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* DHCP related packets.
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| 314 |
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*/
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| 315 |
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UDPClose(DHCPSocket);
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| 316 |
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DHCPSocket = INVALID_UDP_SOCKET;
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| 317 |
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| 318 |
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lastTryTick = TickGet();
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| 319 |
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smDHCPState = SM_DHCP_BOUND;
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| 320 |
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| 321 |
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MY_IP_BYTE1 = tempIPAddress.v[0];
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MY_IP_BYTE2 = tempIPAddress.v[1];
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MY_IP_BYTE3 = tempIPAddress.v[2];
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MY_IP_BYTE4 = tempIPAddress.v[3];
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MY_MASK_BYTE1 = tempMask.v[0];
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MY_MASK_BYTE2 = tempMask.v[1];
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MY_MASK_BYTE3 = tempMask.v[2];
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MY_MASK_BYTE4 = tempMask.v[3];
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| 331 |
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MY_GATE_BYTE1 = tempGateway.v[0];
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MY_GATE_BYTE2 = tempGateway.v[1];
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| 333 |
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MY_GATE_BYTE3 = tempGateway.v[2];
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| 334 |
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MY_GATE_BYTE4 = tempGateway.v[3];
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| 335 |
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| 336 |
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DHCPState.bits.bIsBound = TRUE;
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| 337 |
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| 338 |
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DHCPBindCount++;
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| 339 |
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| 340 |
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return;
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| 341 |
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}
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| 342 |
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}
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| 343 |
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else if ( TickGetDiff(TickGet(), lastTryTick) >= DHCP_TIMEOUT )
|
| 344 |
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{
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| 345 |
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USARTPut('t');
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| 346 |
|
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smDHCPState = SM_DHCP_BROADCAST;
|
| 347 |
|
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}
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| 348 |
|
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break;
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| 349 |
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|
| 350 |
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case SM_DHCP_BOUND:
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| 351 |
|
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/*
|
| 352 |
|
|
* Keep track of how long we use this IP configuration.
|
| 353 |
|
|
* When lease period expires, renew the configuration.
|
| 354 |
|
|
*/
|
| 355 |
|
|
if ( TickGetDiff(TickGet(), lastTryTick) >= TICK_SECOND )
|
| 356 |
|
|
{
|
| 357 |
|
|
DHCPLeaseTime.Val -= 1;
|
| 358 |
|
|
if ( DHCPLeaseTime.Val == 0 )
|
| 359 |
|
|
smDHCPState = SM_DHCP_INIT;
|
| 360 |
|
|
lastTryTick = TickGet();
|
| 361 |
|
|
}
|
| 362 |
|
|
}
|
| 363 |
|
|
|
| 364 |
|
|
}
|
| 365 |
|
|
|
| 366 |
|
|
|
| 367 |
|
|
|
| 368 |
|
|
/*********************************************************************
|
| 369 |
|
|
* Function: void DHCPAbort(void)
|
| 370 |
|
|
*
|
| 371 |
|
|
* PreCondition: DHCPTask() must have been called at least once.
|
| 372 |
|
|
*
|
| 373 |
|
|
* Input: None
|
| 374 |
|
|
*
|
| 375 |
|
|
* Output: None
|
| 376 |
|
|
*
|
| 377 |
|
|
* Side Effects: None
|
| 378 |
|
|
*
|
| 379 |
|
|
* Overview: Forgets about any previous DHCP attempts and
|
| 380 |
|
|
* closes DHCPSocket.
|
| 381 |
|
|
*
|
| 382 |
|
|
* Note:
|
| 383 |
|
|
********************************************************************/
|
| 384 |
|
|
void DHCPAbort(void)
|
| 385 |
|
|
{
|
| 386 |
|
|
smDHCPState = SM_DHCP_ABORTED;
|
| 387 |
|
|
UDPClose(DHCPSocket);
|
| 388 |
|
|
}
|
| 389 |
|
|
|
| 390 |
|
|
|
| 391 |
|
|
|
| 392 |
|
|
|
| 393 |
|
|
|
| 394 |
|
|
/*********************************************************************
|
| 395 |
|
|
DHCP PACKET FORMAT AS PER RFC 1541
|
| 396 |
|
|
|
| 397 |
|
|
0 1 2 3
|
| 398 |
|
|
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
| 399 |
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| 400 |
|
|
| op (1) | htype (1) | hlen (1) | hops (1) |
|
| 401 |
|
|
+---------------+---------------+---------------+---------------+
|
| 402 |
|
|
| xid (4) |
|
| 403 |
|
|
+-------------------------------+-------------------------------+
|
| 404 |
|
|
| secs (2) | flags (2) |
|
| 405 |
|
|
+-------------------------------+-------------------------------+
|
| 406 |
|
|
| ciaddr (4) |
|
| 407 |
|
|
+---------------------------------------------------------------+
|
| 408 |
|
|
| yiaddr (4) |
|
| 409 |
|
|
+---------------------------------------------------------------+
|
| 410 |
|
|
| siaddr (4) |
|
| 411 |
|
|
+---------------------------------------------------------------+
|
| 412 |
|
|
| giaddr (4) |
|
| 413 |
|
|
+---------------------------------------------------------------+
|
| 414 |
|
|
| |
|
| 415 |
|
|
| chaddr (16) |
|
| 416 |
|
|
| |
|
| 417 |
|
|
| |
|
| 418 |
|
|
+---------------------------------------------------------------+
|
| 419 |
|
|
| |
|
| 420 |
|
|
| sname (64) |
|
| 421 |
|
|
+---------------------------------------------------------------+
|
| 422 |
|
|
| |
|
| 423 |
|
|
| file (128) |
|
| 424 |
|
|
+---------------------------------------------------------------+
|
| 425 |
|
|
| |
|
| 426 |
|
|
| options (312) |
|
| 427 |
|
|
+---------------------------------------------------------------+
|
| 428 |
|
|
|
| 429 |
|
|
********************************************************************/
|
| 430 |
|
|
static BYTE _DHCPReceive(void)
|
| 431 |
|
|
{
|
| 432 |
|
|
BYTE v;
|
| 433 |
|
|
BYTE i;
|
| 434 |
|
|
BYTE type;
|
| 435 |
|
|
BOOL lbDone;
|
| 436 |
|
|
DWORD_VAL tempServerID;
|
| 437 |
|
|
|
| 438 |
|
|
|
| 439 |
|
|
// Assume unknown message until proven otherwise.
|
| 440 |
|
|
type = DHCP_UNKNOWN_MESSAGE;
|
| 441 |
|
|
|
| 442 |
|
|
/*
|
| 443 |
|
|
* Assume default IP Lease time of 60 seconds.
|
| 444 |
|
|
* This should be minimum possible to make sure that if
|
| 445 |
|
|
* server did not specify lease time, we try again after
|
| 446 |
|
|
* this minimum time.
|
| 447 |
|
|
*/
|
| 448 |
|
|
DHCPLeaseTime.Val = 60;
|
| 449 |
|
|
|
| 450 |
|
|
UDPGet(&v); // op
|
| 451 |
|
|
/*
|
| 452 |
|
|
* Make sure this is BOOT_REPLY.
|
| 453 |
|
|
*/
|
| 454 |
|
|
if ( v == BOOT_REPLY )
|
| 455 |
|
|
{
|
| 456 |
|
|
/*
|
| 457 |
|
|
* Discard htype, hlen, hops, xid, secs, flags, ciaddr.
|
| 458 |
|
|
*/
|
| 459 |
|
|
for ( i = 0; i < 15; i++ )
|
| 460 |
|
|
UDPGet(&v);
|
| 461 |
|
|
|
| 462 |
|
|
/*
|
| 463 |
|
|
* Save offered IP address until we know for sure that
|
| 464 |
|
|
* we have it.
|
| 465 |
|
|
*/
|
| 466 |
|
|
UDPGet(&tempIPAddress.v[0]);
|
| 467 |
|
|
UDPGet(&tempIPAddress.v[1]);
|
| 468 |
|
|
UDPGet(&tempIPAddress.v[2]);
|
| 469 |
|
|
UDPGet(&tempIPAddress.v[3]);
|
| 470 |
|
|
|
| 471 |
|
|
/*
|
| 472 |
|
|
* Ignore siaddr, giaddr
|
| 473 |
|
|
*/
|
| 474 |
|
|
for ( i = 0; i < 8; i++ )
|
| 475 |
|
|
UDPGet(&v);
|
| 476 |
|
|
|
| 477 |
|
|
/*
|
| 478 |
|
|
* Check to see if chaddr (Client Hardware Address) belongs to us.
|
| 479 |
|
|
*/
|
| 480 |
|
|
for ( i = 0; i < 6; i++ )
|
| 481 |
|
|
{
|
| 482 |
|
|
UDPGet(&v);
|
| 483 |
|
|
if ( v != AppConfig.MyMACAddr.v[i])
|
| 484 |
|
|
goto UDPInvalid;
|
| 485 |
|
|
}
|
| 486 |
|
|
|
| 487 |
|
|
/*
|
| 488 |
|
|
* Ignore part of chaddr, sname, file, magic cookie.
|
| 489 |
|
|
*/
|
| 490 |
|
|
for ( i = 0; i < 206; i++ )
|
| 491 |
|
|
UDPGet(&v);
|
| 492 |
|
|
|
| 493 |
|
|
lbDone = FALSE;
|
| 494 |
|
|
do
|
| 495 |
|
|
{
|
| 496 |
|
|
UDPGet(&v);
|
| 497 |
|
|
|
| 498 |
|
|
switch(v)
|
| 499 |
|
|
{
|
| 500 |
|
|
case DHCP_MESSAGE_TYPE:
|
| 501 |
|
|
UDPGet(&v); // Skip len
|
| 502 |
|
|
// Len must be 1.
|
| 503 |
|
|
if ( v == 1 )
|
| 504 |
|
|
{
|
| 505 |
|
|
UDPGet(&type); // Get type
|
| 506 |
|
|
}
|
| 507 |
|
|
else
|
| 508 |
|
|
goto UDPInvalid;
|
| 509 |
|
|
break;
|
| 510 |
|
|
|
| 511 |
|
|
case DHCP_SUBNET_MASK:
|
| 512 |
|
|
UDPGet(&v); // Skip len
|
| 513 |
|
|
// Len must be 4.
|
| 514 |
|
|
if ( v == 4 )
|
| 515 |
|
|
{
|
| 516 |
|
|
UDPGet(&tempMask.v[0]);
|
| 517 |
|
|
UDPGet(&tempMask.v[1]);
|
| 518 |
|
|
UDPGet(&tempMask.v[2]);
|
| 519 |
|
|
UDPGet(&tempMask.v[3]);
|
| 520 |
|
|
}
|
| 521 |
|
|
else
|
| 522 |
|
|
goto UDPInvalid;
|
| 523 |
|
|
break;
|
| 524 |
|
|
|
| 525 |
|
|
case DHCP_ROUTER:
|
| 526 |
|
|
UDPGet(&v);
|
| 527 |
|
|
// Len must be >= 4.
|
| 528 |
|
|
if ( v >= 4 )
|
| 529 |
|
|
{
|
| 530 |
|
|
UDPGet(&tempGateway.v[0]);
|
| 531 |
|
|
UDPGet(&tempGateway.v[1]);
|
| 532 |
|
|
UDPGet(&tempGateway.v[2]);
|
| 533 |
|
|
UDPGet(&tempGateway.v[3]);
|
| 534 |
|
|
}
|
| 535 |
|
|
else
|
| 536 |
|
|
goto UDPInvalid;
|
| 537 |
|
|
|
| 538 |
|
|
/*
|
| 539 |
|
|
* Discard any other router addresses.
|
| 540 |
|
|
*/
|
| 541 |
|
|
v -= 4;
|
| 542 |
|
|
while(v--)
|
| 543 |
|
|
UDPGet(&i);
|
| 544 |
|
|
break;
|
| 545 |
|
|
|
| 546 |
|
|
case DHCP_SERVER_IDENTIFIER:
|
| 547 |
|
|
UDPGet(&v); // Get len
|
| 548 |
|
|
// Len must be 4.
|
| 549 |
|
|
if ( v == 4 )
|
| 550 |
|
|
{
|
| 551 |
|
|
UDPGet(&UPPER_MSB(tempServerID)); // Get the id
|
| 552 |
|
|
UDPGet(&UPPER_LSB(tempServerID));
|
| 553 |
|
|
UDPGet(&LOWER_MSB(tempServerID));
|
| 554 |
|
|
UDPGet(&LOWER_LSB(tempServerID));
|
| 555 |
|
|
}
|
| 556 |
|
|
else
|
| 557 |
|
|
goto UDPInvalid;
|
| 558 |
|
|
break;
|
| 559 |
|
|
|
| 560 |
|
|
case DHCP_END_OPTION:
|
| 561 |
|
|
lbDone = TRUE;
|
| 562 |
|
|
break;
|
| 563 |
|
|
|
| 564 |
|
|
case DHCP_IP_LEASE_TIME:
|
| 565 |
|
|
UDPGet(&v); // Get len
|
| 566 |
|
|
// Len must be 4.
|
| 567 |
|
|
if ( v == 4 )
|
| 568 |
|
|
{
|
| 569 |
|
|
UDPGet(&UPPER_MSB(DHCPLeaseTime));
|
| 570 |
|
|
UDPGet(&UPPER_LSB(DHCPLeaseTime));
|
| 571 |
|
|
UDPGet(&LOWER_MSB(DHCPLeaseTime));
|
| 572 |
|
|
UDPGet(&LOWER_LSB(DHCPLeaseTime));
|
| 573 |
|
|
|
| 574 |
|
|
/*
|
| 575 |
|
|
* Due to possible timing delays, consider actual lease
|
| 576 |
|
|
* time less by half hour.
|
| 577 |
|
|
*/
|
| 578 |
|
|
if ( DHCPLeaseTime.Val > HALF_HOUR )
|
| 579 |
|
|
DHCPLeaseTime.Val = DHCPLeaseTime.Val - HALF_HOUR;
|
| 580 |
|
|
|
| 581 |
|
|
}
|
| 582 |
|
|
else
|
| 583 |
|
|
goto UDPInvalid;
|
| 584 |
|
|
break;
|
| 585 |
|
|
|
| 586 |
|
|
default:
|
| 587 |
|
|
// Ignore all unsupport tags.
|
| 588 |
|
|
UDPGet(&v); // Get option len
|
| 589 |
|
|
while( v-- ) // Ignore option values
|
| 590 |
|
|
UDPGet(&i);
|
| 591 |
|
|
}
|
| 592 |
|
|
} while( !lbDone );
|
| 593 |
|
|
}
|
| 594 |
|
|
|
| 595 |
|
|
/*
|
| 596 |
|
|
* If this is an OFFER message, remember current server id.
|
| 597 |
|
|
*/
|
| 598 |
|
|
if ( type == DHCP_OFFER_MESSAGE )
|
| 599 |
|
|
{
|
| 600 |
|
|
DHCPServerID.Val = tempServerID.Val;
|
| 601 |
|
|
}
|
| 602 |
|
|
else
|
| 603 |
|
|
{
|
| 604 |
|
|
/*
|
| 605 |
|
|
* For other types of messages, make sure that received
|
| 606 |
|
|
* server id matches with our previous one.
|
| 607 |
|
|
*/
|
| 608 |
|
|
if ( DHCPServerID.Val != tempServerID.Val )
|
| 609 |
|
|
type = DHCP_UNKNOWN_MESSAGE;
|
| 610 |
|
|
}
|
| 611 |
|
|
|
| 612 |
|
|
UDPDiscard(); // We are done with this packet
|
| 613 |
|
|
return type;
|
| 614 |
|
|
|
| 615 |
|
|
UDPInvalid:
|
| 616 |
|
|
UDPDiscard();
|
| 617 |
|
|
return DHCP_UNKNOWN_MESSAGE;
|
| 618 |
|
|
|
| 619 |
|
|
}
|
| 620 |
|
|
|
| 621 |
|
|
|
| 622 |
|
|
|
| 623 |
|
|
|
| 624 |
|
|
|
| 625 |
|
|
static void _DHCPSend(BYTE messageType)
|
| 626 |
|
|
{
|
| 627 |
|
|
BYTE i;
|
| 628 |
|
|
|
| 629 |
|
|
UDPPut(BOOT_REQUEST); // op
|
| 630 |
|
|
UDPPut(HW_TYPE); // htype
|
| 631 |
|
|
UDPPut(LEN_OF_HW_TYPE); // hlen
|
| 632 |
|
|
UDPPut(0); // hops
|
| 633 |
|
|
UDPPut(0x12); // xid[0]
|
| 634 |
|
|
UDPPut(0x23); // xid[1]
|
| 635 |
|
|
UDPPut(0x34); // xid[2]
|
| 636 |
|
|
UDPPut(0x56); // xid[3]
|
| 637 |
|
|
UDPPut(0); // secs[0]
|
| 638 |
|
|
UDPPut(0); // secs[1]
|
| 639 |
|
|
UDPPut(0x80); // flags[0] with BF set
|
| 640 |
|
|
UDPPut(0); // flags[1]
|
| 641 |
|
|
|
| 642 |
|
|
|
| 643 |
|
|
/*
|
| 644 |
|
|
* If this is DHCP REQUEST message, use previously allocated
|
| 645 |
|
|
* IP address.
|
| 646 |
|
|
*/
|
| 647 |
|
|
#if 0
|
| 648 |
|
|
if ( messageType == DHCP_REQUEST_MESSAGE )
|
| 649 |
|
|
{
|
| 650 |
|
|
UDPPut(tempIPAddress.v[0]);
|
| 651 |
|
|
UDPPut(tempIPAddress.v[1]);
|
| 652 |
|
|
UDPPut(tempIPAddress.v[2]);
|
| 653 |
|
|
UDPPut(tempIPAddress.v[3]);
|
| 654 |
|
|
}
|
| 655 |
|
|
else
|
| 656 |
|
|
#endif
|
| 657 |
|
|
{
|
| 658 |
|
|
UDPPut(0x00);
|
| 659 |
|
|
UDPPut(0x00);
|
| 660 |
|
|
UDPPut(0x00);
|
| 661 |
|
|
UDPPut(0x00);
|
| 662 |
|
|
}
|
| 663 |
|
|
|
| 664 |
|
|
/*
|
| 665 |
|
|
* Set yiaddr, siaddr, giaddr as zeros,
|
| 666 |
|
|
*/
|
| 667 |
|
|
for ( i = 0; i < 12; i++ )
|
| 668 |
|
|
UDPPut(0x00);
|
| 669 |
|
|
|
| 670 |
|
|
|
| 671 |
|
|
|
| 672 |
|
|
/*
|
| 673 |
|
|
* Load chaddr - Client hardware address.
|
| 674 |
|
|
*/
|
| 675 |
|
|
UDPPut(MY_MAC_BYTE1);
|
| 676 |
|
|
UDPPut(MY_MAC_BYTE2);
|
| 677 |
|
|
UDPPut(MY_MAC_BYTE3);
|
| 678 |
|
|
UDPPut(MY_MAC_BYTE4);
|
| 679 |
|
|
UDPPut(MY_MAC_BYTE5);
|
| 680 |
|
|
UDPPut(MY_MAC_BYTE6);
|
| 681 |
|
|
|
| 682 |
|
|
/*
|
| 683 |
|
|
* Set chaddr[6..15], sname and file as zeros.
|
| 684 |
|
|
*/
|
| 685 |
|
|
for ( i = 0; i < 202; i++ )
|
| 686 |
|
|
UDPPut(0);
|
| 687 |
|
|
|
| 688 |
|
|
/*
|
| 689 |
|
|
* Load magic cookie as per RFC 1533.
|
| 690 |
|
|
*/
|
| 691 |
|
|
UDPPut(99);
|
| 692 |
|
|
UDPPut(130);
|
| 693 |
|
|
UDPPut(83);
|
| 694 |
|
|
UDPPut(99);
|
| 695 |
|
|
|
| 696 |
|
|
/*
|
| 697 |
|
|
* Load message type.
|
| 698 |
|
|
*/
|
| 699 |
|
|
UDPPut(DHCP_MESSAGE_TYPE);
|
| 700 |
|
|
UDPPut(DHCP_MESSAGE_TYPE_LEN);
|
| 701 |
|
|
UDPPut(messageType);
|
| 702 |
|
|
|
| 703 |
|
|
if ( messageType != DHCP_DISCOVER_MESSAGE && tempIPAddress.Val != 0x0000 )
|
| 704 |
|
|
{
|
| 705 |
|
|
/*
|
| 706 |
|
|
* DHCP REQUEST message may include server identifier,
|
| 707 |
|
|
* to identify the server we are talking to.
|
| 708 |
|
|
* DHCP ACK may include it too. To simplify logic,
|
| 709 |
|
|
* we will include server identifier in DHCP ACK message
|
| 710 |
|
|
* too.
|
| 711 |
|
|
* _DHCPReceive() would populate "serverID" when it
|
| 712 |
|
|
* receives DHCP OFFER message. We will simply use that
|
| 713 |
|
|
* when we are replying to server.
|
| 714 |
|
|
*
|
| 715 |
|
|
* If this is a renwal request, do not include server id.
|
| 716 |
|
|
*/
|
| 717 |
|
|
UDPPut(DHCP_SERVER_IDENTIFIER);
|
| 718 |
|
|
UDPPut(DHCP_SERVER_IDENTIFIER_LEN);
|
| 719 |
|
|
UDPPut(UPPER_MSB(DHCPServerID));
|
| 720 |
|
|
UDPPut(UPPER_LSB(DHCPServerID));
|
| 721 |
|
|
UDPPut(LOWER_MSB(DHCPServerID));
|
| 722 |
|
|
UDPPut(LOWER_LSB(DHCPServerID));
|
| 723 |
|
|
}
|
| 724 |
|
|
|
| 725 |
|
|
/*
|
| 726 |
|
|
* Load our interested parameters
|
| 727 |
|
|
* This is hardcoded list. If any new parameters are desired,
|
| 728 |
|
|
* new lines must be added here.
|
| 729 |
|
|
*/
|
| 730 |
|
|
UDPPut(DHCP_PARAM_REQUEST_LIST);
|
| 731 |
|
|
UDPPut(DHCP_PARAM_REQUEST_LIST_LEN);
|
| 732 |
|
|
UDPPut(DHCP_SUBNET_MASK);
|
| 733 |
|
|
UDPPut(DHCP_ROUTER);
|
| 734 |
|
|
|
| 735 |
|
|
// Add requested IP address to DHCP Request Message
|
| 736 |
|
|
if ( messageType == DHCP_REQUEST_MESSAGE )
|
| 737 |
|
|
{
|
| 738 |
|
|
UDPPut(DHCP_PARAM_REQUEST_IP_ADDRESS);
|
| 739 |
|
|
UDPPut(DHCP_PARAM_REQUEST_IP_ADDRESS_LEN);
|
| 740 |
|
|
|
| 741 |
|
|
UDPPut(tempIPAddress.v[0]);
|
| 742 |
|
|
UDPPut(tempIPAddress.v[1]);
|
| 743 |
|
|
UDPPut(tempIPAddress.v[2]);
|
| 744 |
|
|
UDPPut(tempIPAddress.v[3]);
|
| 745 |
|
|
}
|
| 746 |
|
|
|
| 747 |
|
|
/*
|
| 748 |
|
|
* Add any new paramter request here.
|
| 749 |
|
|
*/
|
| 750 |
|
|
|
| 751 |
|
|
/*
|
| 752 |
|
|
* End of Options.
|
| 753 |
|
|
*/
|
| 754 |
|
|
UDPPut(DHCP_END_OPTION);
|
| 755 |
|
|
|
| 756 |
|
|
UDPFlush();
|
| 757 |
|
|
}
|
| 758 |
|
|
|
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