132 lines
5.2 KiB
C
132 lines
5.2 KiB
C
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2019.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2019 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Header file for DHCP.c.
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*/
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#ifndef _DHCP_H_
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#define _DHCP_H_
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/* Includes: */
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#include <avr/io.h>
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#include <string.h>
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#include "EthernetProtocols.h"
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#include "Ethernet.h"
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#include "ProtocolDecoders.h"
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/* Macros: */
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/** DHCP operation constant, indicating a request from a host to a DHCP server. */
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#define DHCP_OP_BOOTREQUEST 0x01
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/** DHCP operation constant, indicating a reply from a DHCP server to a host. */
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#define DHCP_OP_BOOTREPLY 0x02
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/** Hardware type constant, indicating Ethernet as a carrier. */
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#define DHCP_HTYPE_ETHERNET 0x01
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/** Magic boot protocol "cookie", inserted into all BOOTP packets (BOOTP is the carrier of DHCP). */
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#define DHCP_MAGIC_COOKIE 0x63825363
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/** DHCP option list entry header, indicating that a subnet mask will follow. */
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#define DHCP_OPTION_SUBNETMASK 1
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/** DHCP option list entry header, indicating that the Lease Time will follow. */
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#define DHCP_OPTION_LEASETIME 51
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/** DHCP option list entry header, indicating that the DHCP message type constant will follow. */
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#define DHCP_OPTION_MESSAGETYPE 53
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/** DHCP option list entry header, indicating that the IP address of the DHCP server will follow. */
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#define DHCP_OPTION_DHCPSERVER 54
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/** DHCP option list entry header, used to pad out option data. */
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#define DHCP_OPTION_PAD 0
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/** DHCP option list entry header, indicating the end of option data. */
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#define DHCP_OPTION_END 255
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/** Message type constant, used in the DHCP option data field, requesting that a DHCP server offer an IP address. */
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#define DHCP_MESSAGETYPE_DISCOVER 1
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/** Message type constant, used in the DHCP option data field, indicating that a DHCP server is offering an IP address. */
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#define DHCP_MESSAGETYPE_OFFER 2
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/** Message type constant, used in the DHCP option data field, requesting that a DHCP server lease a given IP address. */
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#define DHCP_MESSAGETYPE_REQUEST 3
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/** Message type constant, used in the DHCP option data field, declining an offered DHCP server IP address lease. */
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#define DHCP_MESSAGETYPE_DECLINE 4
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/** Message type constant, used in the DHCP option data field, ACKing a host IP lease request. */
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#define DHCP_MESSAGETYPE_ACK 5
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/** Message type constant, used in the DHCP option data field, NACKing a host IP lease request. */
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#define DHCP_MESSAGETYPE_NACK 6
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/** Message type constant, used in the DHCP option data field, indicating that a host is releasing a leased IP address. */
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#define DHCP_MESSAGETYPE_RELEASE 7
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/* Type Defines: */
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/** Type define for a DHCP packet inside an Ethernet frame. */
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typedef struct
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{
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uint8_t Operation; /**< DHCP operation, either DHCP_OP_BOOTREQUEST or DHCP_OP_BOOTREPLY */
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uint8_t HardwareType; /**< Hardware carrier type constant */
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uint8_t HardwareAddressLength; /**< Length in bytes of a hardware (MAC) address on the network */
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uint8_t Hops; /**< Number of hops required to reach the server, unused */
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uint32_t TransactionID; /**< Unique ID of the DHCP packet, for positive matching between sent and received packets */
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uint16_t ElapsedSeconds; /**< Elapsed seconds since the request was made */
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uint16_t Flags; /**< BOOTP packet flags */
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IP_Address_t ClientIP; /**< Client IP address, if already leased an IP */
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IP_Address_t YourIP; /**< Client IP address */
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IP_Address_t NextServerIP; /**< Legacy BOOTP protocol field, unused for DHCP */
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IP_Address_t RelayAgentIP; /**< Legacy BOOTP protocol field, unused for DHCP */
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uint8_t ClientHardwareAddress[16]; /**< Hardware (MAC) address of the client making a request to the DHCP server */
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uint8_t ServerHostnameString[64]; /**< Legacy BOOTP protocol field, unused for DHCP */
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uint8_t BootFileName[128]; /**< Legacy BOOTP protocol field, unused for DHCP */
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uint32_t Cookie; /**< Magic BOOTP protocol cookie to indicate a valid packet */
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} DHCP_Header_t;
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/* Function Prototypes: */
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int16_t DHCP_ProcessDHCPPacket(void* IPHeaderInStart,
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void* DHCPHeaderInStart,
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void* DHCPHeaderOutStart);
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#endif
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