/*
             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.
*/

/* Protocol decoders for Ethernet, TCP, IP, ICMP and ARP. Each of these routines
   accepts a header to the appropriate protocol and prints out pertinent information
   on the packet through the serial port.

   To disable printing of a specific protocol, define the token NO_DECODE_{Protocol}
   in the project makefile, and pass it to the compiler using the -D switch.
*/

/** \file
 *
 *  Protocol decoding routines, for the plain-text decoding of Ethernet frames for debugging purposes.
 *  Enabled protocol decoders will print incoming Ethernet frame contents through the USART in a human
 *  readable format.
 *
 *  Note that the USART is a slow transmission medium, and will slow down packet processing considerably.
 *  Packet decoding routines can be disabled by defining NO_DECODE_{Protocol Name} in the project makefile
 *  and passing it to the compiler via the -D switch.
 */

#include "ProtocolDecoders.h"

/** Decodes an Ethernet frame header and prints its contents to through the USART in a human readable format.
 *
 *  \param[in] InDataStart  Pointer to the start of an Ethernet frame header
 */
void DecodeEthernetFrameHeader(void* InDataStart)
{
	#if !defined(NO_DECODE_ETHERNET)
	Ethernet_Frame_Header_t* FrameHeader = (Ethernet_Frame_Header_t*)InDataStart;

	printf_P(PSTR("\r\n"));

	printf_P(PSTR("  ETHERNET\r\n"));

	if (!(MAC_COMPARE(&FrameHeader->Destination, &ServerMACAddress)) &&
	    !(MAC_COMPARE(&FrameHeader->Destination, &BroadcastMACAddress)))
	{
		printf_P(PSTR("  + NOT ADDRESSED TO DEVICE\r\n"));
		return;
	}

	printf_P(PSTR("  + MAC Source : %02X:%02X:%02X:%02X:%02X:%02X\r\n"), FrameHeader->Source.Octets[0],
	                                                                     FrameHeader->Source.Octets[1],
	                                                                     FrameHeader->Source.Octets[2],
	                                                                     FrameHeader->Source.Octets[3],
	                                                                     FrameHeader->Source.Octets[4],
	                                                                     FrameHeader->Source.Octets[5]);

	printf_P(PSTR("  + MAC Dest: %02X:%02X:%02X:%02X:%02X:%02X\r\n"),    FrameHeader->Destination.Octets[0],
	                                                                     FrameHeader->Destination.Octets[1],
	                                                                     FrameHeader->Destination.Octets[2],
	                                                                     FrameHeader->Destination.Octets[3],
	                                                                     FrameHeader->Destination.Octets[4],
	                                                                     FrameHeader->Destination.Octets[5]);

	printf_P(PSTR("  + Protocol: 0x%04x\r\n"), SwapEndian_16(FrameHeader->EtherType));
	#endif
}

/** Decodes an ARP header and prints its contents to through the USART in a human readable format.
 *
 *  \param[in] InDataStart  Pointer to the start of an ARP packet header
 */
void DecodeARPHeader(void* InDataStart)
{
	#if !defined(NO_DECODE_ARP)
	ARP_Header_t* ARPHeader = (ARP_Header_t*)InDataStart;

	printf_P(PSTR("   \\\r\n    ARP\r\n"));

	if (!(IP_COMPARE(&ARPHeader->TPA, &ServerIPAddress)) &&
	    !(MAC_COMPARE(&ARPHeader->THA, &ServerMACAddress)))
	{
		printf_P(PSTR("    + NOT ADDRESSED TO DEVICE\r\n"));
		return;
	}

	printf_P(PSTR("    + Protocol: %x\r\n"), SwapEndian_16(ARPHeader->ProtocolType));
	printf_P(PSTR("    + Operation: %u\r\n"), SwapEndian_16(ARPHeader->Operation));

	if (SwapEndian_16(ARPHeader->ProtocolType) == ETHERTYPE_IPV4)
	{
		printf_P(PSTR("    + SHA MAC: %02X:%02X:%02X:%02X:%02X:%02X\r\n"), ARPHeader->SHA.Octets[0],
		                                                                   ARPHeader->SHA.Octets[1],
		                                                                   ARPHeader->SHA.Octets[2],
		                                                                   ARPHeader->SHA.Octets[3],
		                                                                   ARPHeader->SHA.Octets[4],
		                                                                   ARPHeader->SHA.Octets[5]);

		printf_P(PSTR("    + SPA IP: %u.%u.%u.%u\r\n"), ARPHeader->SPA.Octets[0],
		                                                ARPHeader->SPA.Octets[1],
		                                                ARPHeader->SPA.Octets[2],
		                                                ARPHeader->SPA.Octets[3]);

		printf_P(PSTR("    + THA MAC: %02X:%02X:%02X:%02X:%02X:%02X\r\n"), ARPHeader->THA.Octets[0],
		                                                                   ARPHeader->THA.Octets[1],
		                                                                   ARPHeader->THA.Octets[2],
		                                                                   ARPHeader->THA.Octets[3],
		                                                                   ARPHeader->THA.Octets[4],
		                                                                   ARPHeader->THA.Octets[5]);

		printf_P(PSTR("    + TPA IP: %u.%u.%u.%u\r\n"), ARPHeader->TPA.Octets[0],
		                                                ARPHeader->TPA.Octets[1],
		                                                ARPHeader->TPA.Octets[2],
		                                                ARPHeader->TPA.Octets[3]);
	}
	#endif
}

/** Decodes an IP header and prints its contents to through the USART in a human readable format.
 *
 *  \param[in] InDataStart  Pointer to the start of an IP packet header
 */
void DecodeIPHeader(void* InDataStart)
{
	#if !defined(NO_DECODE_IP)
	IP_Header_t* IPHeader  = (IP_Header_t*)InDataStart;

	uint16_t HeaderLengthBytes = (IPHeader->HeaderLength * sizeof(uint32_t));

	printf_P(PSTR("   \\\r\n    IP\r\n"));

	if (!(IP_COMPARE(&IPHeader->DestinationAddress, &ServerIPAddress)))
	{
		printf_P(PSTR("    + NOT ADDRESSED TO DEVICE\r\n"));
		return;
	}

	printf_P(PSTR("    + Header Length: %u Bytes\r\n"), HeaderLengthBytes);
	printf_P(PSTR("    + Packet Version: %u\r\n"), IPHeader->Version);
	printf_P(PSTR("    + Total Length: %u\r\n"), SwapEndian_16(IPHeader->TotalLength));

	printf_P(PSTR("    + Protocol: %u\r\n"), IPHeader->Protocol);
	printf_P(PSTR("    + TTL: %u\r\n"), IPHeader->TTL);

	printf_P(PSTR("    + IP Src: %u.%u.%u.%u\r\n"), IPHeader->SourceAddress.Octets[0],
	                                                IPHeader->SourceAddress.Octets[1],
	                                                IPHeader->SourceAddress.Octets[2],
	                                                IPHeader->SourceAddress.Octets[3]);

	printf_P(PSTR("    + IP Dst: %u.%u.%u.%u\r\n"), IPHeader->DestinationAddress.Octets[0],
	                                                IPHeader->DestinationAddress.Octets[1],
	                                                IPHeader->DestinationAddress.Octets[2],
	                                                IPHeader->DestinationAddress.Octets[3]);
	#endif
}

/** Decodes an ICMP header and prints its contents to through the USART in a human readable format.
 *
 *  \param[in] InDataStart  Pointer to the start of an ICMP packet header
 */
void DecodeICMPHeader(void* InDataStart)
{
	#if !defined(NO_DECODE_ICMP)
	ICMP_Header_t* ICMPHeader  = (ICMP_Header_t*)InDataStart;

	printf_P(PSTR("    \\\r\n     ICMP\r\n"));

	printf_P(PSTR("     + Type: %u\r\n"), ICMPHeader->Type);
	printf_P(PSTR("     + Code: %u\r\n"), ICMPHeader->Code);
	#endif
}

/** Decodes a TCP header and prints its contents to through the USART in a human readable format.
 *
 *  \param[in] InDataStart  Pointer to the start of a TCP packet header
 */
void DecodeTCPHeader(void* InDataStart)
{
	#if !defined(NO_DECODE_TCP)
	TCP_Header_t* TCPHeader  = (TCP_Header_t*)InDataStart;

	uint16_t               HeaderLengthBytes = (TCPHeader->DataOffset * sizeof(uint32_t));

	printf_P(PSTR("    \\\r\n     TCP\r\n"));

	printf_P(PSTR("     + Header Length: %u Bytes\r\n"), HeaderLengthBytes);

	printf_P(PSTR("     + Source Port: %u\r\n"), SwapEndian_16(TCPHeader->SourcePort));
	printf_P(PSTR("     + Destination Port: %u\r\n"), SwapEndian_16(TCPHeader->DestinationPort));

	printf_P(PSTR("     + Sequence Number: %lu\r\n"), SwapEndian_32(TCPHeader->SequenceNumber));
	printf_P(PSTR("     + Acknowledgment Number: %lu\r\n"), SwapEndian_32(TCPHeader->AcknowledgmentNumber));

	printf_P(PSTR("     + Flags: 0x%02X\r\n"), TCPHeader->Flags);

	if (TCP_GetPortState(TCPHeader->DestinationPort) == TCP_Port_Closed)
	  printf_P(PSTR("     + NOT LISTENING ON DESTINATION PORT\r\n"));
	#endif
}

/** Decodes an UDP header and prints its contents to through the USART in a human readable format.
 *
 *  \param[in] InDataStart  Pointer to the start of a UDP packet header
 */
void DecodeUDPHeader(void* InDataStart)
{
	#if !defined(NO_DECODE_UDP)
	UDP_Header_t* UDPHeader = (UDP_Header_t*)InDataStart;

	printf_P(PSTR("    \\\r\n     UDP\r\n"));

	printf_P(PSTR("     + Source Port: %u\r\n"), SwapEndian_16(UDPHeader->SourcePort));
	printf_P(PSTR("     + Destination Port: %u\r\n"), SwapEndian_16(UDPHeader->DestinationPort));

	printf_P(PSTR("     + Data Length: %d\r\n"), SwapEndian_16(UDPHeader->Length));
	#endif
}

/** Decodes an DHCP header and prints its contents to through the USART in a human readable format.
 *
 *  \param[in] InDataStart  Pointer to the start of a DHCP packet header
 */
void DecodeDHCPHeader(void* InDataStart)
{
	#if !defined(NO_DECODE_DHCP)
	uint8_t* DHCPOptions = ((uint8_t*)InDataStart + sizeof(DHCP_Header_t));

	printf_P(PSTR("     \\\r\n      DHCP\r\n"));

	while (DHCPOptions[0] != DHCP_OPTION_END)
	{
		if (DHCPOptions[0] == DHCP_OPTION_MESSAGETYPE)
		{
			switch (DHCPOptions[2])
			{
				case DHCP_MESSAGETYPE_DISCOVER:
					printf_P(PSTR("      + DISCOVER\r\n"));
					break;
				case DHCP_MESSAGETYPE_REQUEST:
					printf_P(PSTR("      + REQUEST\r\n"));
					break;
				case DHCP_MESSAGETYPE_RELEASE:
					printf_P(PSTR("      + RELEASE\r\n"));
					break;
				case DHCP_MESSAGETYPE_DECLINE:
					printf_P(PSTR("      + DECLINE\r\n"));
					break;
			}
		}

		DHCPOptions += ((DHCPOptions[0] == DHCP_OPTION_PAD) ? 1 : (DHCPOptions[1] + 2));
	}
	#endif
}

