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hedin |
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/*********************************************************************
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*
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* Dynamic Host Configuration Protocol (DHCP) Client
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* Module for Microchip TCP/IP Stack
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* -Provides automatic IP address, subnet mask, gateway address,
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* DNS server address, and other configuration parameters on DHCP
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* enabled networks.
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* -Reference: RFC 2131, 2132
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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, PIC24F, PIC24H, dsPIC30F, dsPIC33F
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* Complier: Microchip C18 v3.02 or higher
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* Microchip C30 v2.01 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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* Copyright © 2002-2007 Microchip Technology Inc. All rights
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* reserved.
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*
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* Microchip licenses to you the right to use, modify, copy, and
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* distribute:
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* (i) the Software when embedded on a Microchip microcontroller or
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* digital signal controller product (“Device”) which is
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* integrated into Licensee’s product; or
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* (ii) ONLY the Software driver source files ENC28J60.c and
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* ENC28J60.h ported to a non-Microchip device used in
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* conjunction with a Microchip ethernet controller for the
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* sole purpose of interfacing with the ethernet controller.
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*
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* You should refer to the license agreement accompanying this
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* Software for additional information regarding your rights and
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* obligations.
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*
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* THE SOFTWARE AND DOCUMENTATION ARE PROVIDED “AS IS” WITHOUT
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* WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT
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* LIMITATION, ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A
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* PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* MICROCHIP BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA, COST OF
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* PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR SERVICES, ANY CLAIMS
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* BY THIRD PARTIES (INCLUDING BUT NOT LIMITED TO ANY DEFENSE
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* THEREOF), ANY CLAIMS FOR INDEMNITY OR CONTRIBUTION, OR OTHER
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* SIMILAR COSTS, WHETHER ASSERTED ON THE BASIS OF CONTRACT, TORT
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* (INCLUDING NEGLIGENCE), BREACH OF WARRANTY, OR OTHERWISE.
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*
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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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* Nilesh Rajbharti 3/1/04 Used tickDiff in DHCPTask() "bind"
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* state to adjust for irregular TICK_SECOND
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* Without this logic, actual lease time count
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* down may be incorrect.
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* Howard Schlunder 5/11/06 Fixed tickDiff usage, reducing
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* accumulated timing error. Fixed DHCP
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* state machine requesting IP 0.0.0.0
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* after lease expiration.
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* Howard Schlunder 6/01/06 Added DHCPFlags.bits.bOfferReceived flag to
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* allow operation on networks with multiple
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* DHCP servers offering multiple addresses
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* Howard Schlunder 8/01/06 Added DNS server option to DHCP request,
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* untested Host Name option to DHCP request
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* Howard Schlunder 1/09/06 Fixed a DHCP renewal not renewing lease time bug
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* Howard Schlunder 3/16/07 Rewrote DHCP state machine
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********************************************************************/
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#define __DHCP_C
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#include "TCPIP Stack/TCPIP.h"
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#if defined(STACK_USE_DHCP_CLIENT)
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#define DHCP_TIMEOUT (TICK)(2*TICK_SECOND)
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SM_DHCP smDHCPState = SM_DHCP_GET_SOCKET;
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DHCP_CLIENT_FLAGS DHCPFlags = { 0x00 };
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BYTE DHCPBindCount = 0;
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static UDP_SOCKET DHCPSocket = INVALID_UDP_SOCKET;
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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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#if defined(STACK_USE_DNS)
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static IP_ADDR tempDNS;
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static IP_ADDR tempDNS2;
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#endif
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//static BYTE tempHostName[16];
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static union
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{
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struct
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{
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char IPAddress:1;
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char Gateway:1;
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char Mask:1;
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char DNS:1;
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char DNS2:1;
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char HostName:1;
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} bits;
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BYTE Val;
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} ValidValues;
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static BYTE _DHCPReceive(void);
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static void _DHCPSend(BYTE messageType);
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/*********************************************************************
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* Function: void DHCPReset(void)
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*
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* PreCondition: None
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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: Resets the DHCP client, giving up any lease,
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* knowledge of DHCP servers, etc.
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*
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* Note: None
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********************************************************************/
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void DHCPReset(void)
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{
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// Do nothing if DHCP is 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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smDHCPState = SM_DHCP_SEND_DISCOVERY;
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else
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smDHCPState = SM_DHCP_GET_SOCKET;
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DHCPBindCount = 0;
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DHCPFlags.bits.bIsBound = FALSE;
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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
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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: Gets and generates DHCP messages to obtain a
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* lease and keep it from expiring
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*
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* Note: None
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********************************************************************/
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void DHCPTask(void)
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{
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static TICK eventTime;
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switch(smDHCPState)
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{
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case SM_DHCP_DISABLED:
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if(DHCPSocket != INVALID_UDP_SOCKET)
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{
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UDPClose(DHCPSocket);
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DHCPSocket = INVALID_UDP_SOCKET;
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}
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break;
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case SM_DHCP_GET_SOCKET:
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// Open a socket to send and receive broadcast messages on
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DHCPSocket = UDPOpen(DHCP_CLIENT_PORT, NULL, DHCP_SERVER_PORT);
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if(DHCPSocket == INVALID_UDP_SOCKET)
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break;
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smDHCPState = SM_DHCP_SEND_DISCOVERY;
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// No break
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case SM_DHCP_SEND_DISCOVERY:
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if(UDPIsPutReady(DHCPSocket) < 258)
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break;
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// Ensure that we transmit to the broadcast IP and MAC addresses
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// The UDP Socket remembers who it was last talking to
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memset((void*)&UDPSocketInfo[DHCPSocket].remoteNode, 0xFF, sizeof(UDPSocketInfo[DHCPSocket].remoteNode));
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// Assume default IP Lease time of 60 seconds.
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// This should be minimum possible to make sure that if
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// server did not specify lease time, we try again after this minimum time.
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DHCPLeaseTime.Val = 60;
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ValidValues.Val = 0x00;
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DHCPBindCount = 0;
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DHCPFlags.bits.bIsBound = FALSE;
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DHCPFlags.bits.bOfferReceived = FALSE;
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// Send the DHCP Discover broadcast
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_DHCPSend(DHCP_DISCOVER_MESSAGE);
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// Start a timer and begin looking for a response
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eventTime = TickGet() + DHCP_TIMEOUT;
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smDHCPState = SM_DHCP_GET_OFFER;
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break;
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case SM_DHCP_GET_OFFER:
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// Check to see if a packet has arrived
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if(UDPIsGetReady(DHCPSocket) < 250)
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{
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// Go back and transmit a new discovery if we didn't get an offer after 2 seconds
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if((LONG)(eventTime - TickGet()) <= (LONG)0)
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smDHCPState = SM_DHCP_SEND_DISCOVERY;
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break;
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}
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// Let the DHCP server module know that there is a DHCP server
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// on this network
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DHCPFlags.bits.bDHCPServerDetected = TRUE;
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// Check to see if we received an offer
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if(_DHCPReceive() != DHCP_OFFER_MESSAGE)
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break;
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smDHCPState = SM_DHCP_SEND_REQUEST;
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// No break
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case SM_DHCP_SEND_REQUEST:
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if(UDPIsPutReady(DHCPSocket) < 258)
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break;
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// Send the DHCP request message
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_DHCPSend(DHCP_REQUEST_MESSAGE);
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// Start a timer and begin looking for a response
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eventTime = TickGet() + DHCP_TIMEOUT;
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smDHCPState = SM_DHCP_GET_REQUEST_ACK;
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break;
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case SM_DHCP_GET_REQUEST_ACK:
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// Check to see if a packet has arrived
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if(UDPIsGetReady(DHCPSocket) < 250)
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{
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// Go back and transmit a new discovery if we didn't get an ACK after 2 seconds
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if((LONG)(eventTime - TickGet()) <= (LONG)0)
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smDHCPState = SM_DHCP_SEND_DISCOVERY;
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break;
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}
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// Check to see if we received an offer
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switch(_DHCPReceive())
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{
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case DHCP_ACK_MESSAGE:
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eventTime = TickGet() + TICK_SECOND;
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smDHCPState = SM_DHCP_BOUND;
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DHCPFlags.bits.bIsBound = TRUE;
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DHCPBindCount++;
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if(ValidValues.bits.IPAddress)
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AppConfig.MyIPAddr = tempIPAddress;
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if(ValidValues.bits.Mask)
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AppConfig.MyMask = tempMask;
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if(ValidValues.bits.Gateway)
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AppConfig.MyGateway = tempGateway;
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#if defined(STACK_USE_DNS)
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if(ValidValues.bits.DNS)
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AppConfig.PrimaryDNSServer = tempDNS;
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if(ValidValues.bits.DNS2)
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AppConfig.SecondaryDNSServer = tempDNS2;
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#endif
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// if(ValidValues.bits.HostName)
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// memcpy(AppConfig.NetBIOSName, (void*)tempHostName, sizeof(AppConfig.NetBIOSName));
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break;
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case DHCP_NAK_MESSAGE:
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smDHCPState = SM_DHCP_SEND_DISCOVERY;
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break;
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}
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break;
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case SM_DHCP_BOUND:
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if((LONG)(eventTime - TickGet()) >= (LONG)0)
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break;
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300 |
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// Check to see if our lease has nearly expired and we must renew
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eventTime += TICK_SECOND;
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DHCPLeaseTime.Val--;
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if(DHCPLeaseTime.Val)
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break;
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smDHCPState = SM_DHCP_SEND_RENEW;
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// No break
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case SM_DHCP_SEND_RENEW:
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case SM_DHCP_SEND_RENEW2:
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case SM_DHCP_SEND_RENEW3:
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if(UDPIsPutReady(DHCPSocket) < 258)
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break;
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315 |
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// Send the DHCP request message
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_DHCPSend(DHCP_REQUEST_MESSAGE);
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DHCPFlags.bits.bOfferReceived = FALSE;
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// Start a timer and begin looking for a response
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320 |
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eventTime = TickGet() + DHCP_TIMEOUT;
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smDHCPState++;
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break;
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323 |
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324 |
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case SM_DHCP_GET_RENEW_ACK:
|
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case SM_DHCP_GET_RENEW_ACK2:
|
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case SM_DHCP_GET_RENEW_ACK3:
|
327 |
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// Check to see if a packet has arrived
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328 |
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if(UDPIsGetReady(DHCPSocket) < 250)
|
329 |
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{
|
330 |
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// Go back and transmit a new discovery if we didn't get an ACK after 2 seconds
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331 |
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if((LONG)(eventTime - TickGet()) <= (LONG)0)
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{
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if(++smDHCPState > SM_DHCP_GET_RENEW_ACK3)
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smDHCPState = SM_DHCP_SEND_DISCOVERY;
|
335 |
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}
|
336 |
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break;
|
337 |
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}
|
338 |
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// Check to see if we received an offer
|
340 |
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switch(_DHCPReceive())
|
341 |
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{
|
342 |
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case DHCP_ACK_MESSAGE:
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eventTime = TickGet() + TICK_SECOND;
|
344 |
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DHCPBindCount++;
|
345 |
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smDHCPState = SM_DHCP_BOUND;
|
346 |
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break;
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347 |
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348 |
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case DHCP_NAK_MESSAGE:
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349 |
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smDHCPState = SM_DHCP_SEND_DISCOVERY;
|
350 |
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break;
|
351 |
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}
|
352 |
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break;
|
353 |
|
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}
|
354 |
|
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}
|
355 |
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|
356 |
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|
357 |
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|
358 |
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/*********************************************************************
|
359 |
|
|
DHCP PACKET FORMAT AS PER RFC 1541
|
360 |
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|
|
361 |
|
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0 1 2 3
|
362 |
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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
|
363 |
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
364 |
|
|
| op (1) | htype (1) | hlen (1) | hops (1) |
|
365 |
|
|
+---------------+---------------+---------------+---------------+
|
366 |
|
|
| xid (4) |
|
367 |
|
|
+-------------------------------+-------------------------------+
|
368 |
|
|
| secs (2) | flags (2) |
|
369 |
|
|
+-------------------------------+-------------------------------+
|
370 |
|
|
| ciaddr (4) |
|
371 |
|
|
+---------------------------------------------------------------+
|
372 |
|
|
| yiaddr (4) |
|
373 |
|
|
+---------------------------------------------------------------+
|
374 |
|
|
| siaddr (4) |
|
375 |
|
|
+---------------------------------------------------------------+
|
376 |
|
|
| giaddr (4) |
|
377 |
|
|
+---------------------------------------------------------------+
|
378 |
|
|
| |
|
379 |
|
|
| chaddr (16) |
|
380 |
|
|
| |
|
381 |
|
|
| |
|
382 |
|
|
+---------------------------------------------------------------+
|
383 |
|
|
| |
|
384 |
|
|
| sname (64) |
|
385 |
|
|
+---------------------------------------------------------------+
|
386 |
|
|
| |
|
387 |
|
|
| file (128) |
|
388 |
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|
+---------------------------------------------------------------+
|
389 |
|
|
| |
|
390 |
|
|
| options (312) |
|
391 |
|
|
+---------------------------------------------------------------+
|
392 |
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|
|
393 |
|
|
********************************************************************/
|
394 |
|
|
static BYTE _DHCPReceive(void)
|
395 |
|
|
{
|
396 |
|
|
BYTE v;
|
397 |
|
|
BYTE i, j;
|
398 |
|
|
BYTE type;
|
399 |
|
|
BOOL lbDone;
|
400 |
|
|
DWORD_VAL tempServerID;
|
401 |
|
|
|
402 |
|
|
|
403 |
|
|
// Assume unknown message until proven otherwise.
|
404 |
|
|
type = DHCP_UNKNOWN_MESSAGE;
|
405 |
|
|
|
406 |
|
|
UDPGet(&v); // op
|
407 |
|
|
|
408 |
|
|
// Make sure this is BOOT_REPLY.
|
409 |
|
|
if ( v == BOOT_REPLY )
|
410 |
|
|
{
|
411 |
|
|
// Discard htype, hlen, hops, xid, secs, flags, ciaddr.
|
412 |
|
|
for ( i = 0; i < 15u; i++ )
|
413 |
|
|
UDPGet(&v);
|
414 |
|
|
|
415 |
|
|
// Check to see if this is the first offer
|
416 |
|
|
if(DHCPFlags.bits.bOfferReceived)
|
417 |
|
|
{
|
418 |
|
|
// Discard offered IP address, we already have an offer
|
419 |
|
|
for ( i = 0; i < 4u; i++ )
|
420 |
|
|
UDPGet(&v);
|
421 |
|
|
}
|
422 |
|
|
else
|
423 |
|
|
{
|
424 |
|
|
// Save offered IP address until we know for sure that we have it.
|
425 |
|
|
UDPGetArray((BYTE*)&tempIPAddress, sizeof(tempIPAddress));
|
426 |
|
|
ValidValues.bits.IPAddress = 1;
|
427 |
|
|
}
|
428 |
|
|
|
429 |
|
|
// Ignore siaddr, giaddr
|
430 |
|
|
for ( i = 0; i < 8u; i++ )
|
431 |
|
|
UDPGet(&v);
|
432 |
|
|
|
433 |
|
|
// Check to see if chaddr (Client Hardware Address) belongs to us.
|
434 |
|
|
for ( i = 0; i < 6u; i++ )
|
435 |
|
|
{
|
436 |
|
|
UDPGet(&v);
|
437 |
|
|
if ( v != AppConfig.MyMACAddr.v[i])
|
438 |
|
|
goto UDPInvalid;
|
439 |
|
|
}
|
440 |
|
|
|
441 |
|
|
|
442 |
|
|
// Ignore part of chaddr, sname, file, magic cookie.
|
443 |
|
|
for ( i = 0; i < 206u; i++ )
|
444 |
|
|
UDPGet(&v);
|
445 |
|
|
|
446 |
|
|
lbDone = FALSE;
|
447 |
|
|
do
|
448 |
|
|
{
|
449 |
|
|
// Get the Option number
|
450 |
|
|
// Break out eventually in case if this is a malformed
|
451 |
|
|
// DHCP message, ie: missing DHCP_END_OPTION marker
|
452 |
|
|
if(!UDPGet(&v))
|
453 |
|
|
{
|
454 |
|
|
lbDone = TRUE;
|
455 |
|
|
break;
|
456 |
|
|
}
|
457 |
|
|
|
458 |
|
|
switch(v)
|
459 |
|
|
{
|
460 |
|
|
case DHCP_MESSAGE_TYPE:
|
461 |
|
|
UDPGet(&v); // Skip len
|
462 |
|
|
// Len must be 1.
|
463 |
|
|
if ( v == 1u )
|
464 |
|
|
{
|
465 |
|
|
UDPGet(&type); // Get type
|
466 |
|
|
|
467 |
|
|
// Throw away the packet if we know we don't need it (ie: another offer when we already have one)
|
468 |
|
|
if(DHCPFlags.bits.bOfferReceived && (type == DHCP_OFFER_MESSAGE))
|
469 |
|
|
{
|
470 |
|
|
goto UDPInvalid;
|
471 |
|
|
}
|
472 |
|
|
}
|
473 |
|
|
else
|
474 |
|
|
goto UDPInvalid;
|
475 |
|
|
break;
|
476 |
|
|
|
477 |
|
|
case DHCP_SUBNET_MASK:
|
478 |
|
|
UDPGet(&v); // Skip len
|
479 |
|
|
// Len must be 4.
|
480 |
|
|
if ( v == 4u )
|
481 |
|
|
{
|
482 |
|
|
// Check to see if this is the first offer
|
483 |
|
|
if(DHCPFlags.bits.bOfferReceived)
|
484 |
|
|
{
|
485 |
|
|
// Discard offered IP mask, we already have an offer
|
486 |
|
|
for ( i = 0; i < 4u; i++ )
|
487 |
|
|
UDPGet(&v);
|
488 |
|
|
}
|
489 |
|
|
else
|
490 |
|
|
{
|
491 |
|
|
UDPGetArray((BYTE*)&tempMask, sizeof(tempMask));
|
492 |
|
|
ValidValues.bits.Mask = 1;
|
493 |
|
|
}
|
494 |
|
|
}
|
495 |
|
|
else
|
496 |
|
|
goto UDPInvalid;
|
497 |
|
|
break;
|
498 |
|
|
|
499 |
|
|
case DHCP_ROUTER:
|
500 |
|
|
UDPGet(&j);
|
501 |
|
|
// Len must be >= 4.
|
502 |
|
|
if ( j >= 4u )
|
503 |
|
|
{
|
504 |
|
|
// Check to see if this is the first offer
|
505 |
|
|
if(DHCPFlags.bits.bOfferReceived)
|
506 |
|
|
{
|
507 |
|
|
// Discard offered Gateway address, we already have an offer
|
508 |
|
|
for ( i = 0; i < 4u; i++ )
|
509 |
|
|
UDPGet(&v);
|
510 |
|
|
}
|
511 |
|
|
else
|
512 |
|
|
{
|
513 |
|
|
UDPGetArray((BYTE*)&tempGateway, sizeof(tempGateway));
|
514 |
|
|
ValidValues.bits.Gateway = 1;
|
515 |
|
|
}
|
516 |
|
|
}
|
517 |
|
|
else
|
518 |
|
|
goto UDPInvalid;
|
519 |
|
|
|
520 |
|
|
// Discard any other router addresses.
|
521 |
|
|
j -= 4;
|
522 |
|
|
while(j--)
|
523 |
|
|
UDPGet(&v);
|
524 |
|
|
break;
|
525 |
|
|
|
526 |
|
|
#if defined(STACK_USE_DNS)
|
527 |
|
|
case DHCP_DNS:
|
528 |
|
|
UDPGet(&j);
|
529 |
|
|
// Len must be >= 4.
|
530 |
|
|
if(j < 4u)
|
531 |
|
|
goto UDPInvalid;
|
532 |
|
|
|
533 |
|
|
// Check to see if this is the first offer
|
534 |
|
|
if(!DHCPFlags.bits.bOfferReceived)
|
535 |
|
|
{
|
536 |
|
|
UDPGetArray((BYTE*)&tempDNS, sizeof(tempDNS));
|
537 |
|
|
ValidValues.bits.DNS = 1;
|
538 |
|
|
j -= 4;
|
539 |
|
|
}
|
540 |
|
|
|
541 |
|
|
// Len must be >= 4 for a secondary DNS server address
|
542 |
|
|
if(j >= 4u)
|
543 |
|
|
{
|
544 |
|
|
// Check to see if this is the first offer
|
545 |
|
|
if(!DHCPFlags.bits.bOfferReceived)
|
546 |
|
|
{
|
547 |
|
|
UDPGetArray((BYTE*)&tempDNS2, sizeof(tempDNS2));
|
548 |
|
|
ValidValues.bits.DNS2 = 1;
|
549 |
|
|
j -= 4;
|
550 |
|
|
}
|
551 |
|
|
}
|
552 |
|
|
|
553 |
|
|
// Discard any other DNS server addresses
|
554 |
|
|
while(j--)
|
555 |
|
|
UDPGet(&v);
|
556 |
|
|
break;
|
557 |
|
|
#endif
|
558 |
|
|
|
559 |
|
|
// case DHCP_HOST_NAME:
|
560 |
|
|
// UDPGet(&j);
|
561 |
|
|
// // Len must be >= 4.
|
562 |
|
|
// if(j < 1u)
|
563 |
|
|
// goto UDPInvalid;
|
564 |
|
|
//
|
565 |
|
|
// // Check to see if this is the first offer
|
566 |
|
|
// if(DHCPFlags.bits.bOfferReceived)
|
567 |
|
|
// {
|
568 |
|
|
// // Discard offered host name, we already have an offer
|
569 |
|
|
// while(j--)
|
570 |
|
|
// UDPGet(&v);
|
571 |
|
|
// }
|
572 |
|
|
// else
|
573 |
|
|
// {
|
574 |
|
|
// for(i = 0; j, i < sizeof(tempHostName); i++, j--)
|
575 |
|
|
// {
|
576 |
|
|
// UDPGet(&tempHostName[i]);
|
577 |
|
|
// }
|
578 |
|
|
// while(j--)
|
579 |
|
|
// {
|
580 |
|
|
// UDPGet(&v);
|
581 |
|
|
// }
|
582 |
|
|
// ValidValues.bits.HostName = 1;
|
583 |
|
|
// }
|
584 |
|
|
//
|
585 |
|
|
// break;
|
586 |
|
|
|
587 |
|
|
case DHCP_SERVER_IDENTIFIER:
|
588 |
|
|
UDPGet(&v); // Get len
|
589 |
|
|
// Len must be 4.
|
590 |
|
|
if ( v == 4u )
|
591 |
|
|
{
|
592 |
|
|
UDPGet(&tempServerID.v[3]); // Get the id
|
593 |
|
|
UDPGet(&tempServerID.v[2]);
|
594 |
|
|
UDPGet(&tempServerID.v[1]);
|
595 |
|
|
UDPGet(&tempServerID.v[0]);
|
596 |
|
|
}
|
597 |
|
|
else
|
598 |
|
|
goto UDPInvalid;
|
599 |
|
|
break;
|
600 |
|
|
|
601 |
|
|
case DHCP_END_OPTION:
|
602 |
|
|
lbDone = TRUE;
|
603 |
|
|
break;
|
604 |
|
|
|
605 |
|
|
case DHCP_IP_LEASE_TIME:
|
606 |
|
|
UDPGet(&v); // Get len
|
607 |
|
|
// Len must be 4.
|
608 |
|
|
if ( v == 4u )
|
609 |
|
|
{
|
610 |
|
|
// Check to see if this is the first offer
|
611 |
|
|
if(DHCPFlags.bits.bOfferReceived)
|
612 |
|
|
{
|
613 |
|
|
// Discard offered lease time, we already have an offer
|
614 |
|
|
for ( i = 0; i < 4u; i++ )
|
615 |
|
|
UDPGet(&v);
|
616 |
|
|
}
|
617 |
|
|
else
|
618 |
|
|
{
|
619 |
|
|
UDPGet(&DHCPLeaseTime.v[3]);
|
620 |
|
|
UDPGet(&DHCPLeaseTime.v[2]);
|
621 |
|
|
UDPGet(&DHCPLeaseTime.v[1]);
|
622 |
|
|
UDPGet(&DHCPLeaseTime.v[0]);
|
623 |
|
|
|
624 |
|
|
// In case if our clock is not as accurate as the remote
|
625 |
|
|
// DHCP server's clock, let's treat the lease time as only
|
626 |
|
|
// 96.875% of the value given
|
627 |
|
|
DHCPLeaseTime.Val -= DHCPLeaseTime.Val>>5;
|
628 |
|
|
}
|
629 |
|
|
}
|
630 |
|
|
else
|
631 |
|
|
goto UDPInvalid;
|
632 |
|
|
break;
|
633 |
|
|
|
634 |
|
|
default:
|
635 |
|
|
// Ignore all unsupport tags.
|
636 |
|
|
UDPGet(&j); // Get option len
|
637 |
|
|
while( j-- ) // Ignore option values
|
638 |
|
|
UDPGet(&v);
|
639 |
|
|
}
|
640 |
|
|
} while( !lbDone );
|
641 |
|
|
}
|
642 |
|
|
|
643 |
|
|
// If this is an OFFER message, remember current server id.
|
644 |
|
|
if ( type == DHCP_OFFER_MESSAGE )
|
645 |
|
|
{
|
646 |
|
|
DHCPServerID.Val = tempServerID.Val;
|
647 |
|
|
DHCPFlags.bits.bOfferReceived = TRUE;
|
648 |
|
|
}
|
649 |
|
|
else
|
650 |
|
|
{
|
651 |
|
|
// For other types of messages, make sure that received
|
652 |
|
|
// server id matches with our previous one.
|
653 |
|
|
if ( DHCPServerID.Val != tempServerID.Val )
|
654 |
|
|
type = DHCP_UNKNOWN_MESSAGE;
|
655 |
|
|
}
|
656 |
|
|
|
657 |
|
|
UDPDiscard(); // We are done with this packet
|
658 |
|
|
return type;
|
659 |
|
|
|
660 |
|
|
UDPInvalid:
|
661 |
|
|
UDPDiscard();
|
662 |
|
|
return DHCP_UNKNOWN_MESSAGE;
|
663 |
|
|
|
664 |
|
|
}
|
665 |
|
|
|
666 |
|
|
|
667 |
|
|
|
668 |
|
|
|
669 |
|
|
|
670 |
|
|
static void _DHCPSend(BYTE messageType)
|
671 |
|
|
{
|
672 |
|
|
BYTE i;
|
673 |
|
|
IP_ADDR MyIP;
|
674 |
|
|
|
675 |
|
|
|
676 |
|
|
UDPPut(BOOT_REQUEST); // op
|
677 |
|
|
UDPPut(BOOT_HW_TYPE); // htype
|
678 |
|
|
UDPPut(BOOT_LEN_OF_HW_TYPE); // hlen
|
679 |
|
|
UDPPut(0); // hops
|
680 |
|
|
UDPPut(0x12); // xid[0]
|
681 |
|
|
UDPPut(0x23); // xid[1]
|
682 |
|
|
UDPPut(0x34); // xid[2]
|
683 |
|
|
UDPPut(0x56); // xid[3]
|
684 |
|
|
UDPPut(0); // secs[0]
|
685 |
|
|
UDPPut(0); // secs[1]
|
686 |
|
|
UDPPut(0x80); // flags[0] with BF set
|
687 |
|
|
UDPPut(0); // flags[1]
|
688 |
|
|
|
689 |
|
|
// If this is DHCP REQUEST message, use previously allocated IP address.
|
690 |
|
|
#if 0
|
691 |
|
|
if ( messageType == DHCP_REQUEST_MESSAGE )
|
692 |
|
|
{
|
693 |
|
|
UDPPutArray((BYTE*)&tempIPAddress, sizeof(tempIPAddress));
|
694 |
|
|
}
|
695 |
|
|
else
|
696 |
|
|
#endif
|
697 |
|
|
{
|
698 |
|
|
UDPPut(0x00);
|
699 |
|
|
UDPPut(0x00);
|
700 |
|
|
UDPPut(0x00);
|
701 |
|
|
UDPPut(0x00);
|
702 |
|
|
}
|
703 |
|
|
|
704 |
|
|
// Set yiaddr, siaddr, giaddr as zeros,
|
705 |
|
|
for ( i = 0; i < 12u; i++ )
|
706 |
|
|
UDPPut(0x00);
|
707 |
|
|
|
708 |
|
|
// Load chaddr - Client hardware address.
|
709 |
|
|
UDPPutArray((BYTE*)&AppConfig.MyMACAddr, sizeof(AppConfig.MyMACAddr));
|
710 |
|
|
|
711 |
|
|
// Set chaddr[6..15], sname and file as zeros.
|
712 |
|
|
for ( i = 0; i < 202u; i++ )
|
713 |
|
|
UDPPut(0);
|
714 |
|
|
|
715 |
|
|
// Load magic cookie as per RFC 1533.
|
716 |
|
|
UDPPut(99);
|
717 |
|
|
UDPPut(130);
|
718 |
|
|
UDPPut(83);
|
719 |
|
|
UDPPut(99);
|
720 |
|
|
|
721 |
|
|
// Load message type.
|
722 |
|
|
UDPPut(DHCP_MESSAGE_TYPE);
|
723 |
|
|
UDPPut(DHCP_MESSAGE_TYPE_LEN);
|
724 |
|
|
UDPPut(messageType);
|
725 |
|
|
|
726 |
|
|
if(messageType == DHCP_DISCOVER_MESSAGE)
|
727 |
|
|
{
|
728 |
|
|
// Reset offered flag so we know to act upon the next valid offer
|
729 |
|
|
DHCPFlags.bits.bOfferReceived = FALSE;
|
730 |
|
|
}
|
731 |
|
|
|
732 |
|
|
|
733 |
|
|
if ( messageType != DHCP_DISCOVER_MESSAGE && tempIPAddress.Val != 0x0000u )
|
734 |
|
|
{
|
735 |
|
|
// DHCP REQUEST message may include server identifier,
|
736 |
|
|
// to identify the server we are talking to.
|
737 |
|
|
// DHCP ACK may include it too. To simplify logic,
|
738 |
|
|
// we will include server identifier in DHCP ACK message too.
|
739 |
|
|
// _DHCPReceive() would populate "serverID" when it
|
740 |
|
|
// receives DHCP OFFER message. We will simply use that
|
741 |
|
|
// when we are replying to server.
|
742 |
|
|
// If this is a renwal request, do not include server id.
|
743 |
|
|
UDPPut(DHCP_SERVER_IDENTIFIER);
|
744 |
|
|
UDPPut(DHCP_SERVER_IDENTIFIER_LEN);
|
745 |
|
|
UDPPut(DHCPServerID.v[3]);
|
746 |
|
|
UDPPut(DHCPServerID.v[2]);
|
747 |
|
|
UDPPut(DHCPServerID.v[1]);
|
748 |
|
|
UDPPut(DHCPServerID.v[0]);
|
749 |
|
|
}
|
750 |
|
|
|
751 |
|
|
// Load our interested parameters
|
752 |
|
|
// This is hardcoded list. If any new parameters are desired,
|
753 |
|
|
// new lines must be added here.
|
754 |
|
|
UDPPut(DHCP_PARAM_REQUEST_LIST);
|
755 |
|
|
UDPPut(DHCP_PARAM_REQUEST_LIST_LEN);
|
756 |
|
|
UDPPut(DHCP_SUBNET_MASK);
|
757 |
|
|
UDPPut(DHCP_ROUTER);
|
758 |
|
|
UDPPut(DHCP_DNS);
|
759 |
|
|
UDPPut(DHCP_HOST_NAME);
|
760 |
|
|
|
761 |
|
|
// Add requested IP address to DHCP Request Message
|
762 |
|
|
if ( messageType == DHCP_REQUEST_MESSAGE )
|
763 |
|
|
{
|
764 |
|
|
UDPPut(DHCP_PARAM_REQUEST_IP_ADDRESS);
|
765 |
|
|
UDPPut(DHCP_PARAM_REQUEST_IP_ADDRESS_LEN);
|
766 |
|
|
UDPPutArray((BYTE*)&tempIPAddress, DHCP_PARAM_REQUEST_IP_ADDRESS_LEN);
|
767 |
|
|
}
|
768 |
|
|
|
769 |
|
|
// Add any new paramter request here.
|
770 |
|
|
|
771 |
|
|
// End of Options.
|
772 |
|
|
UDPPut(DHCP_END_OPTION);
|
773 |
|
|
|
774 |
|
|
// Make sure we advirtise a 0.0.0.0 IP address so all DHCP servers will respond. If we have a static IP outside the DHCP server's scope, it may simply ignore discover messages.
|
775 |
|
|
MyIP.Val = AppConfig.MyIPAddr.Val;
|
776 |
|
|
AppConfig.MyIPAddr.Val = 0x00000000;
|
777 |
|
|
UDPFlush();
|
778 |
|
|
AppConfig.MyIPAddr.Val = MyIP.Val;
|
779 |
|
|
|
780 |
|
|
}
|
781 |
|
|
|
782 |
|
|
|
783 |
|
|
#endif //#if defined(STACK_USE_DHCP_CLIENT)
|