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lufa-master/Demos/Device/ClassDriver/RNDISEthernet/Lib/DHCP.c 5.48 KB
142ecdaf   rguillom   first commit
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  /*
               LUFA Library
       Copyright (C) Dean Camera, 2019.
  
    dean [at] fourwalledcubicle [dot] com
             www.lufa-lib.org
  */
  
  /*
    Copyright 2019  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  
    Permission to use, copy, modify, distribute, and sell this
    software and its documentation for any purpose is hereby granted
    without fee, provided that the above copyright notice appear in
    all copies and that both that the copyright notice and this
    permission notice and warranty disclaimer appear in supporting
    documentation, and that the name of the author not be used in
    advertising or publicity pertaining to distribution of the
    software without specific, written prior permission.
  
    The author disclaims all warranties with regard to this
    software, including all implied warranties of merchantability
    and fitness.  In no event shall the author be liable for any
    special, indirect or consequential damages or any damages
    whatsoever resulting from loss of use, data or profits, whether
    in an action of contract, negligence or other tortious action,
    arising out of or in connection with the use or performance of
    this software.
  */
  
  /** \file
   *
   *  Dynamic Host Configuration Protocol (DHCP) packet handling routines. This protocol
   *  handles the automatic IP negotiation to the host, so that the host will use the provided
   *  IP address given to it by the device.
   */
  
  #include "DHCP.h"
  
  /** Processes a DHCP packet inside an Ethernet frame, and writes the appropriate response
   *  to the output Ethernet frame if the host is requesting or accepting an IP address.
   *
   *  \param[in] IPHeaderInStart     Pointer to the start of the incoming packet's IP header
   *  \param[in] DHCPHeaderInStart   Pointer to the start of the incoming packet's DHCP header
   *  \param[out] DHCPHeaderOutStart  Pointer to the start of the outgoing packet's DHCP header
   *
   *  \return The number of bytes written to the out Ethernet frame if any, NO_RESPONSE otherwise
   */
  int16_t DHCP_ProcessDHCPPacket(void* IPHeaderInStart,
                                 void* DHCPHeaderInStart,
                                 void* DHCPHeaderOutStart)
  {
  	IP_Header_t*   IPHeaderIN    = (IP_Header_t*)IPHeaderInStart;
  	DHCP_Header_t* DHCPHeaderIN  = (DHCP_Header_t*)DHCPHeaderInStart;
  	DHCP_Header_t* DHCPHeaderOUT = (DHCP_Header_t*)DHCPHeaderOutStart;
  
  	uint8_t* DHCPOptionsINStart  = ((uint8_t*)DHCPHeaderInStart  + sizeof(DHCP_Header_t));
  	uint8_t* DHCPOptionsOUTStart = ((uint8_t*)DHCPHeaderOutStart + sizeof(DHCP_Header_t));
  
  	DecodeDHCPHeader(DHCPHeaderInStart);
  
  	/* Zero out the response DHCP packet, as much of it is legacy and left at 0 */
  	memset(DHCPHeaderOUT, 0, sizeof(DHCP_Header_t));
  
  	/* Fill out the response DHCP packet */
  	DHCPHeaderOUT->HardwareType          = DHCPHeaderIN->HardwareType;
  	DHCPHeaderOUT->Operation             = DHCP_OP_BOOTREPLY;
  	DHCPHeaderOUT->HardwareAddressLength = DHCPHeaderIN->HardwareAddressLength;
  	DHCPHeaderOUT->Hops                  = 0;
  	DHCPHeaderOUT->TransactionID         = DHCPHeaderIN->TransactionID;
  	DHCPHeaderOUT->ElapsedSeconds        = 0;
  	DHCPHeaderOUT->Flags                 = DHCPHeaderIN->Flags;
  	DHCPHeaderOUT->YourIP                = ClientIPAddress;
  	memmove(&DHCPHeaderOUT->ClientHardwareAddress, &DHCPHeaderIN->ClientHardwareAddress, sizeof(MAC_Address_t));
  	DHCPHeaderOUT->Cookie                = SwapEndian_32(DHCP_MAGIC_COOKIE);
  
  	/* Alter the incoming IP packet header so that the corrected IP source and destinations are used - this means that
  	   when the response IP header is generated, it will use the corrected addresses and not the null/broatcast addresses */
  	IPHeaderIN->SourceAddress      = ClientIPAddress;
  	IPHeaderIN->DestinationAddress = ServerIPAddress;
  
  	/* Process the incoming DHCP packet options */
  	while (DHCPOptionsINStart[0] != DHCP_OPTION_END)
  	{
  		/* Find the Message Type DHCP option, to determine the type of DHCP packet */
  		if (DHCPOptionsINStart[0] == DHCP_OPTION_MESSAGETYPE)
  		{
  			if ((DHCPOptionsINStart[2] == DHCP_MESSAGETYPE_DISCOVER) || (DHCPOptionsINStart[2] == DHCP_MESSAGETYPE_REQUEST))
  			{
  				/* Fill out the response DHCP packet options for a DHCP OFFER or ACK response */
  
  				*(DHCPOptionsOUTStart++) = DHCP_OPTION_MESSAGETYPE;
  				*(DHCPOptionsOUTStart++) = 1;
  				*(DHCPOptionsOUTStart++) = (DHCPOptionsINStart[2] == DHCP_MESSAGETYPE_DISCOVER) ? DHCP_MESSAGETYPE_OFFER
  																								: DHCP_MESSAGETYPE_ACK;
  
  				*(DHCPOptionsOUTStart++) = DHCP_OPTION_SUBNETMASK;
  				*(DHCPOptionsOUTStart++) = sizeof(IP_Address_t);
  				*(DHCPOptionsOUTStart++) = 0xFF;
  				*(DHCPOptionsOUTStart++) = 0xFF;
  				*(DHCPOptionsOUTStart++) = 0xFF;
  				*(DHCPOptionsOUTStart++) = 0x00;
  
  				*(DHCPOptionsOUTStart++) = DHCP_OPTION_LEASETIME;
  				*(DHCPOptionsOUTStart++) = sizeof(uint32_t);
  				/* Lease Time 86400s (ONE_DAY) */
  				*(DHCPOptionsOUTStart++) = 0x00;
  				*(DHCPOptionsOUTStart++) = 0x01;
  				*(DHCPOptionsOUTStart++) = 0x51;
  				*(DHCPOptionsOUTStart++) = 0x80;
  
  				*(DHCPOptionsOUTStart++) = DHCP_OPTION_DHCPSERVER;
  				*(DHCPOptionsOUTStart++) = sizeof(IP_Address_t);
  				memcpy(DHCPOptionsOUTStart, &ServerIPAddress, sizeof(IP_Address_t));
  				DHCPOptionsOUTStart     += sizeof(IP_Address_t);
  
  				*(DHCPOptionsOUTStart++) = DHCP_OPTION_END;
  
  				return (sizeof(DHCP_Header_t) + 18 + sizeof(IP_Address_t));
  			}
  		}
  
  		/* Go to the next DHCP option - skip one byte if option is a padding byte, else skip the complete option's size */
  		DHCPOptionsINStart += ((DHCPOptionsINStart[0] == DHCP_OPTION_PAD) ? 1 : (DHCPOptionsINStart[1] + 2));
  	}
  
  	return NO_RESPONSE;
  }