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264 lines
11 KiB
264 lines
11 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2010 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 disclaim 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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* DHCP Client Application. When connected to the uIP stack, this will retrieve IP configuration settings from the
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* DHCP server on the network.
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*/
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#include "DHCPApp.h"
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#if defined(ENABLE_DHCP) || defined(__DOXYGEN__)
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/** Timer for managing the timeout period for a DHCP server to respond */
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struct timer DHCPTimer;
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/** Initialization function for the DHCP client. */
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void DHCPApp_Init(void)
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{
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uip_udp_appstate_t* const AppState = &uip_udp_conn->appstate;
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/* Create a new UDP connection to the DHCP server port for the DHCP solicitation */
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uip_ipaddr_t DHCPServerIPAddress;
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uip_ipaddr(&DHCPServerIPAddress, 255, 255, 255, 255);
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AppState->Connection = uip_udp_new(&DHCPServerIPAddress, HTONS(DHCPC_SERVER_PORT));
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/* If the connection was sucessfully created, bind it to the local DHCP client port */
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if(AppState->Connection != NULL)
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{
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uip_udp_bind(AppState->Connection, HTONS(DHCPC_CLIENT_PORT));
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AppState->CurrentState = DHCP_STATE_SendDiscover;
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}
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/* Set timeout period to half a second for a DHCP server to respond */
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timer_set(&DHCPTimer, CLOCK_SECOND / 2);
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}
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/** uIP stack application callback for the DHCP client. This function must be called each time the TCP/IP stack
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* needs a UDP packet to be processed.
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*/
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void DHCPApp_Callback(void)
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{
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uip_udp_appstate_t* const AppState = &uip_udp_conn->appstate;
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DHCP_Header_t* const AppData = (DHCP_Header_t*)uip_appdata;
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uint16_t AppDataSize = 0;
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switch (AppState->CurrentState)
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{
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case DHCP_STATE_SendDiscover:
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/* Clear all DHCP settings, reset client IP address */
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memset(&AppState->DHCPOffer_Data, 0x00, sizeof(AppState->DHCPOffer_Data));
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uip_sethostaddr(&AppState->DHCPOffer_Data.AllocatedIP);
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/* Fill out the DHCP response header */
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AppDataSize += DHCPApp_FillDHCPHeader(AppData, DHCP_DISCOVER, AppState);
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/* Add the required DHCP options list to the packet */
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uint8_t RequiredOptionList[] = {DHCP_OPTION_SUBNET_MASK, DHCP_OPTION_ROUTER, DHCP_OPTION_DNS_SERVER};
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AppDataSize += DHCPApp_SetOption(AppData->Options, DHCP_OPTION_REQ_LIST, sizeof(RequiredOptionList),
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RequiredOptionList);
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/* Send the DHCP DISCOVER packet */
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uip_send(AppData, AppDataSize);
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/* Reset the timeout timer, progress to next state */
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timer_reset(&DHCPTimer);
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AppState->CurrentState = DHCP_STATE_WaitForOffer;
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break;
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case DHCP_STATE_WaitForOffer:
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if (!(uip_newdata()))
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{
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/* Check if the DHCP timeout period has expired while waiting for a response */
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if (timer_expired(&DHCPTimer))
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AppState->CurrentState = DHCP_STATE_SendDiscover;
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break;
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}
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uint8_t OfferResponse_MessageType;
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if ((AppData->TransactionID == DHCP_TRANSACTION_ID) &&
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DHCPApp_GetOption(AppData->Options, DHCP_OPTION_MSG_TYPE, &OfferResponse_MessageType) &&
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(OfferResponse_MessageType == DHCP_OFFER))
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{
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/* Received a DHCP offer for an IP address, copy over values for later request */
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memcpy(&AppState->DHCPOffer_Data.AllocatedIP, &AppData->YourIP, sizeof(uip_ipaddr_t));
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DHCPApp_GetOption(AppData->Options, DHCP_OPTION_SUBNET_MASK, &AppState->DHCPOffer_Data.Netmask);
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DHCPApp_GetOption(AppData->Options, DHCP_OPTION_ROUTER, &AppState->DHCPOffer_Data.GatewayIP);
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DHCPApp_GetOption(AppData->Options, DHCP_OPTION_SERVER_ID, &AppState->DHCPOffer_Data.ServerIP);
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timer_reset(&DHCPTimer);
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AppState->CurrentState = DHCP_STATE_SendRequest;
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}
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break;
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case DHCP_STATE_SendRequest:
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/* Fill out the DHCP response header */
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AppDataSize += DHCPApp_FillDHCPHeader(AppData, DHCP_REQUEST, AppState);
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/* Add the DHCP REQUESTED IP ADDRESS option to the packet */
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AppDataSize += DHCPApp_SetOption(AppData->Options, DHCP_OPTION_REQ_IPADDR, sizeof(uip_ipaddr_t),
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&AppState->DHCPOffer_Data.AllocatedIP);
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/* Add the DHCP SERVER IP ADDRESS option to the packet */
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AppDataSize += DHCPApp_SetOption(AppData->Options, DHCP_OPTION_SERVER_ID, sizeof(uip_ipaddr_t),
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&AppState->DHCPOffer_Data.ServerIP);
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/* Send the DHCP REQUEST packet */
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uip_send(AppData, AppDataSize);
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/* Reset the timeout timer, progress to next state */
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timer_reset(&DHCPTimer);
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AppState->CurrentState = DHCP_STATE_WaitForACK;
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break;
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case DHCP_STATE_WaitForACK:
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if (!(uip_newdata()))
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{
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/* Check if the DHCP timeout period has expired while waiting for a response */
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if (timer_expired(&DHCPTimer))
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AppState->CurrentState = DHCP_STATE_SendDiscover;
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break;
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}
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uint8_t RequestResponse_MessageType;
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if ((AppData->TransactionID == DHCP_TRANSACTION_ID) &&
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DHCPApp_GetOption(AppData->Options, DHCP_OPTION_MSG_TYPE, &RequestResponse_MessageType) &&
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(RequestResponse_MessageType == DHCP_ACK))
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{
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/* Set the new network parameters from the DHCP server */
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uip_sethostaddr(&AppState->DHCPOffer_Data.AllocatedIP);
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uip_setnetmask(&AppState->DHCPOffer_Data.Netmask);
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uip_setdraddr(&AppState->DHCPOffer_Data.GatewayIP);
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AppState->CurrentState = DHCP_STATE_AddressLeased;
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}
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break;
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}
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}
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/** Fills the DHCP packet response with the appropriate BOOTP header for DHCP. This fills out all the required
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* fields, leaving only the additional DHCP options to be added to the packet before it is sent to the DHCP server.
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*
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* \param[out] DHCPHeader Location in the packet buffer where the BOOTP header should be written to
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* \param[in] DHCPMessageType DHCP Message type, such as DHCP_DISCOVER
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* \param[in] AppState Application state of the current UDP connection
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*
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* \return Size in bytes of the created DHCP packet
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*/
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uint16_t DHCPApp_FillDHCPHeader(DHCP_Header_t* DHCPHeader, uint8_t DHCPMessageType, uip_udp_appstate_t* AppState)
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{
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/* Erase existing packet data so that we start will all 0x00 DHCP header data */
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memset(DHCPHeader, 0, sizeof(DHCP_Header_t));
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/* Fill out the DHCP packet header */
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DHCPHeader->Operation = DHCP_OP_BOOTREQUEST;
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DHCPHeader->HardwareType = DHCP_HTYPE_ETHERNET;
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DHCPHeader->HardwareAddressLength = sizeof(MACAddress);
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DHCPHeader->Hops = 0;
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DHCPHeader->TransactionID = DHCP_TRANSACTION_ID;
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DHCPHeader->ElapsedSeconds = 0;
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DHCPHeader->Flags = HTONS(BOOTP_BROADCAST);
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memcpy(&DHCPHeader->ClientIP, &uip_hostaddr, sizeof(uip_ipaddr_t));
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memcpy(&DHCPHeader->YourIP, &AppState->DHCPOffer_Data.AllocatedIP, sizeof(uip_ipaddr_t));
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memcpy(&DHCPHeader->NextServerIP, &AppState->DHCPOffer_Data.ServerIP, sizeof(uip_ipaddr_t));
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memcpy(&DHCPHeader->ClientHardwareAddress, &MACAddress, sizeof(struct uip_eth_addr));
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DHCPHeader->Cookie = DHCP_MAGIC_COOKIE;
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/* Add a DHCP type and terminator options to the start of the DHCP options field */
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DHCPHeader->Options[0] = DHCP_OPTION_MSG_TYPE;
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DHCPHeader->Options[1] = 1;
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DHCPHeader->Options[2] = DHCPMessageType;
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DHCPHeader->Options[3] = DHCP_OPTION_END;
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/* Calculate the total number of bytes added to the outgoing packet */
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return (sizeof(DHCP_Header_t) + 4);
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}
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/** Sets the given DHCP option in the DHCP packet's option list. This automatically moves the
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* end of options terminator past the new option in the options list.
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*
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* \param[in,out] DHCPOptionList Pointer to the start of the DHCP packet's options list
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* \param[in] Option DHCP option to add to the list
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* \param[in] DataLen Size in bytes of the option data to add
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* \param[in] OptionData Buffer where the option's data is to be sourced from
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*
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* \return Number of bytes added to the DHCP packet
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*/
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uint8_t DHCPApp_SetOption(uint8_t* DHCPOptionList, uint8_t Option, uint8_t DataLen, void* OptionData)
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{
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/* Skip through the DHCP options list until the terminator option is found */
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while (*DHCPOptionList != DHCP_OPTION_END)
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DHCPOptionList += (DHCPOptionList[1] + 2);
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/* Overwrite the existing terminator with the new option, add a new terminator at the end of the list */
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DHCPOptionList[0] = Option;
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DHCPOptionList[1] = DataLen;
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memcpy(&DHCPOptionList[2], OptionData, DataLen);
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DHCPOptionList[2 + DataLen] = DHCP_OPTION_END;
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/* Calculate the total number of bytes added to the outgoing packet */
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return (2 + DataLen);
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}
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/** Retrieves the given option's data (if present) from the DHCP packet's options list.
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*
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* \param[in,out] DHCPOptionList Pointer to the start of the DHCP packet's options list
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* \param[in] Option DHCP option to retrieve to the list
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* \param[out] Destination Buffer where the option's data is to be written to if found
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*
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* \return Boolean true if the option was found in the DHCP packet's options list, false otherwise
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*/
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bool DHCPApp_GetOption(uint8_t* DHCPOptionList, uint8_t Option, void* Destination)
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{
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/* Look through the incomming DHCP packet's options list for the requested option */
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while (*DHCPOptionList != DHCP_OPTION_END)
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{
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/* Check if the current DHCP option in the packet is the one requested */
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if (DHCPOptionList[0] == Option)
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{
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/* Copy request option's data to the destination buffer */
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memcpy(Destination, &DHCPOptionList[2], DHCPOptionList[1]);
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/* Indicate that the requested option data was sucessfully retrieved */
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return true;
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}
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/* Skip to next DHCP option in the options list */
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DHCPOptionList += (DHCPOptionList[1] + 2);
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}
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/* Requested option not found in the incomming packet's DHCP options list */
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return false;
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}
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#endif
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