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/*--------------------------------------------------------------------

 * TITLE: etermip

 * AUTHOR: Steve Rhoads (rhoadss@yahoo.com)

 * DATE CREATED: 6/13/07

 * FILENAME: etermip.c

 * PROJECT: Plasma CPU core

 * COPYRIGHT: Software placed into the public domain by the author.

 *    Software 'as is' without warranty.  Author liable for nothing.

 * DESCRIPTION:

 *    A terminal program supporting downloading new Plasma applications

 *    and Ethernet packet transfers.  Based on WinPcap example code.

 *    Requires WinPcap library at http://www.winpcap.org/.

 *--------------------------------------------------------------------*/

#include <windows.h>

#include <stdio.h>

#include <conio.h>

//#define SIMULATE_PLASMA

#if 0

   #include "pcap.h"

#else

   //From "pcap.h"

   #define PCAP_ERRBUF_SIZE 256

   typedef struct pcap_if {

      struct pcap_if *next;

      char *name;               /* name to hand to "pcap_open_live()" */

      char *description;        /* textual description of interface, or NULL */

      struct pcap_addr *addresses;

      unsigned long flags;      /* PCAP_IF_ interface flags */

   } pcap_if_t;

   struct pcap_pkthdr {

      struct timeval ts;        /* time stamp */

      unsigned long caplen;     /* length of portion present */

      unsigned long len;        /* length this packet (off wire) */

   };

   typedef struct pcap pcap_t;

   int pcap_findalldevs(pcap_if_t **, char *);

   void pcap_freealldevs(pcap_if_t *);

   pcap_t *pcap_open_live(const char *, int, int, int, char *);

   int pcap_setnonblock(pcap_t *, int, char *);

   int pcap_sendpacket(pcap_t *, const u_char *, int);

   const unsigned char *pcap_next(pcap_t *, struct pcap_pkthdr *);

#endif

//ETHER FIELD                 OFFSET   LENGTH   VALUE

#define ETHERNET_DEST         0        //6

#define ETHERNET_SOURCE       6        //6

#define ETHERNET_FRAME_TYPE   12       //2      IP=0x0800; ARP=0x0806

#define IP_PROTOCOL           23       //1      TCP=0x06;PING=0x01;UDP=0x11

#define IP_SOURCE             26       //4

static const unsigned char ethernetAddressNull[] =    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};

static const unsigned char ethernetAddressPhantom[] = {0x00, 0x10, 0xdd, 0xce, 0x15, 0xd4};

static const unsigned char ethernetAddressPhantom2[] = {0x00, 0x10, 0xdd, 0xce, 0x15, 0xd5};

static pcap_t *adhandle;

static HANDLE serial_handle;

static int PacketBytes, PacketLength, PacketChecksum, Checksum;

static int ChecksumOk, ChecksumError;

static unsigned char PacketData[2000];

static int EthernetActive;

#ifdef SIMULATE_PLASMA

   extern void *IPFrameGet(int freeCount);

   extern int IPProcessEthernetPacket(void *frameIn, int length);

   extern void IPTick(void);

   extern void IPInit(void (*frameSendFunction)());

   extern void HtmlInit(int UseFiles);

   extern void ConsoleInit(void);

   static void *ethFrame;

#endif

int WinPcapInit(void)

{

        pcap_if_t *alldevs;

        pcap_if_t *d;

        int inum;

        int i=0;

   int choice = -1;

        char errbuf[PCAP_ERRBUF_SIZE];

   /* Retrieve the device list */

        if(pcap_findalldevs(&alldevs, errbuf) == -1)

        {

                printf("Error in pcap_findalldevs: %s\n", errbuf);

                exit(1);

        }

        /* Print the list */

        for(d = alldevs; d; d=d->next)

        {

                printf("%d. %s", ++i, d->name);

                if (d->description)

                        printf(" (%s)\n", d->description);

                else

                        printf(" (No description available)\n");

      if(strstr(d->description, "Generic") == 0)

      {

         if(choice == -1)

            choice = i;

         else

            choice = -2;

      }

        }

        if(i==0)

        {

                printf("\nNo interfaces found! Make sure WinPcap is installed.\n");

                return -1;

        }

   if(choice >= 0)

      inum = choice;

   else if(i == 1)

      inum = 1;

   else

   {

           printf("Enter the interface number (1-%d):",i);

           scanf("%d", &inum);

   }

   printf("inum = %d\n", inum);

        if(inum < 1 || inum > i)

        {

                printf("\nInterface number out of range.\n");

                /* Free the device list */

                pcap_freealldevs(alldevs);

                return -1;

        }

        /* Jump to the selected adapter */

        for(d=alldevs, i=0; i< inum-1 ;d=d->next, i++);

        /* Open the adapter */

        if ((adhandle = pcap_open_live(d->name, // name of the device

                                       65536,   // 65536 grants that the whole packet will be captured on all the MACs.

                                       1,       // promiscuous mode (nonzero means promiscuous)

                                       10,      // read timeout

                                       errbuf   // error buffer

                                       )) == NULL)

        {

                printf("\nUnable to open the adapter. %s is not supported by WinPcap\n", d->name);

                /* Free the device list */

                pcap_freealldevs(alldevs);

                return -1;

        }

        printf("\nlistening on %s...\n", d->description);

        /* At this point, we don't need any more the device list. Free it */

        pcap_freealldevs(alldevs);

   /* start the capture */

   pcap_setnonblock(adhandle, 1, errbuf);

   return 0;

}

void EthernetSendPacket(const unsigned char *packet, int length)

{

   EthernetActive = 1;

   pcap_sendpacket(adhandle, packet, length);

}

/* Callback function invoked by libpcap for every incoming packet */

void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data)

{

#ifndef SIMULATE_PLASMA

   int i, checksum;

   unsigned char buf[80];

   DWORD count;

#else

   int rc;

#endif

   (void)param;

   if(pkt_data[ETHERNET_FRAME_TYPE] != 0x08)

      return;  //not IP or ARP

   if(pkt_data[ETHERNET_FRAME_TYPE+1] != 0x00 &&

      pkt_data[ETHERNET_FRAME_TYPE+1] != 0x06)

      return;  //not IP or ARP

   if(memcmp(pkt_data, ethernetAddressNull, 6) &&      //not broadcast address

      memcmp(pkt_data+ETHERNET_DEST, ethernetAddressPhantom, 6) &&

      memcmp(pkt_data+ETHERNET_DEST, ethernetAddressPhantom2, 6))

      return;

#ifndef SIMULATE_PLASMA

   //Send the ethernet packet over the serial port

   buf[0] = 0xff;

   buf[1] = (unsigned char)(header->len >> 8);

   buf[2] = (unsigned char)header->len;

   checksum = 0;

   for(i = 0; i < (int)header->len; ++i)

      checksum += pkt_data[i];

   buf[3] = (unsigned char)checksum;

   WriteFile(serial_handle, buf, 4, &count, NULL);

   WriteFile(serial_handle, pkt_data, header->len, &count, NULL);

#else

   if(ethFrame == NULL)

      ethFrame = IPFrameGet(0);

   if(ethFrame == NULL)

      return;

   memcpy(ethFrame, pkt_data, header->len);

   rc = IPProcessEthernetPacket(ethFrame, header->len);

   if(rc)

      ethFrame = NULL;

#endif

}

/**************************************************************/

long SerialOpen(char *name, long baud)

{

   DCB dcb;

   COMMTIMEOUTS comm_timeouts;

   BOOL rc;

   serial_handle = CreateFile(name, GENERIC_READ|GENERIC_WRITE,

      0, NULL, OPEN_EXISTING, 0, NULL);

   if(serial_handle == INVALID_HANDLE_VALUE)

      printf("Serial Port In Use!\n");

   rc = SetupComm(serial_handle, 16000, 16000);

   if(rc == FALSE)

      printf("Serial port already in use!!!\n");

   rc = GetCommState(serial_handle, &dcb);

   if(rc == FALSE)

      printf("ERROR2\n");

   dcb.BaudRate = baud;

   dcb.fBinary = 1;

   dcb.ByteSize = 8;

   dcb.fAbortOnError = 0;

   dcb.StopBits = 0; //ONESTOPBIT;

   dcb.fOutX = 0;

   dcb.fInX = 0;

   dcb.fNull = 0;

   dcb.Parity = 0;

   dcb.fOutxCtsFlow = 0;

   dcb.fOutxDsrFlow = 0;

   dcb.fOutX = 0;

   dcb.fInX = 0;

   dcb.fRtsControl = 0;

   rc = SetCommState(serial_handle, &dcb);

   if(rc == FALSE)

      printf("ERROR3\n");

   rc = GetCommTimeouts(serial_handle, &comm_timeouts);

   if(rc == FALSE)

      printf("ERROR4\n");

   comm_timeouts.ReadIntervalTimeout = MAXDWORD;  //non-blocking read

   comm_timeouts.ReadTotalTimeoutMultiplier = 0;

   comm_timeouts.ReadTotalTimeoutConstant = 0;

   comm_timeouts.WriteTotalTimeoutMultiplier = 0;  //blocking write

   comm_timeouts.WriteTotalTimeoutConstant = 0;

   rc = SetCommTimeouts(serial_handle, &comm_timeouts);

   if(rc == FALSE)

      printf("ERROR5\n");

   return(0);

}

static void UartPacketRead(int value)

{

   if(PacketBytes == 0 && value == 0xff)

   {

      ++PacketBytes;

   }

   else if(PacketBytes == 1)

   {

      ++PacketBytes;

      PacketLength = value << 8;

   }

   else if(PacketBytes == 2)

   {

      ++PacketBytes;

      PacketLength |= value;

      if(PacketLength > 1000)

      {

         PacketBytes = 0;

         printf("Eterm Length Bad! (%d)\n", PacketLength);

      }

   }

   else if(PacketBytes == 3)

   {

      ++PacketBytes;

      PacketChecksum = value;

      Checksum = 0;

   }

   else if(PacketBytes >= 4)

   {

      if(PacketBytes - 4 < sizeof(PacketData))

         PacketData[PacketBytes - 4] = (unsigned char)value;

      Checksum += value;

      ++PacketBytes;

      if(PacketBytes - 4 >= PacketLength)

      {

         if((unsigned char)Checksum == PacketChecksum)

         {

            ++ChecksumOk;

            EthernetSendPacket(PacketData, PacketLength);

         }

         else

         {

            ++ChecksumError;

            //printf("ChecksumError(%d %d)!\n", ChecksumOk, ChecksumError);

         }

         PacketBytes = 0;

      }

   }

}

long SerialRead(unsigned char *data, unsigned long length)

{

   DWORD count, bytes;

   unsigned char buf[8];

   count = 0;

   for(;;)

   {

      ReadFile(serial_handle, buf, 1, &bytes, NULL);

      if(bytes == 0)

         break;

      if(buf[0] == 0xff || PacketBytes)

         UartPacketRead(buf[0]);

      else

         data[count++] = buf[0];

      if(count >= length)

         break;

   }

   return count;

}

//****************************************************

#define BUF_SIZE 1024*128

void SendFile(void)

{

   FILE *in;

   unsigned char *buf;

   long length;

   DWORD count;

   in=fopen("test.bin", "rb");

   if(in==NULL) {

      printf("Can't find test.bin\n");

      return;

   }

   buf = (unsigned char*)malloc(BUF_SIZE);

   memset(buf, 0, BUF_SIZE);

   length = (int)fread(buf, 1, BUF_SIZE, in);

   fclose(in);

   printf("Sending test.bin (length=%d bytes) to target...\n", length);

   WriteFile(serial_handle, buf, length, &count, NULL);

   printf("Done downloading\n");

   free(buf);

}

int main(int argc, char *argv[])

{

   unsigned int ticksLast = GetTickCount();

   int length;

   unsigned char buf[80];

   DWORD count;

   unsigned int ticks;

   int downloadSkip = 0;

   (void)argc;

   (void)argv;

   WinPcapInit();

#ifndef SIMULATE_PLASMA

   SerialOpen("COM1", 57600);

   if(argc != 2 || strcmp(argv[1], "none"))

      SendFile();

   else

      downloadSkip = 1;

#else

   IPInit(EthernetSendPacket);

   HtmlInit(1);

   ConsoleInit();

#endif

   for(;;)

   {

      // Read keypresses

      while(kbhit())

      {

         buf[0] = (unsigned char)getch();

         if(downloadSkip && buf[0] == '`')

            SendFile();

         WriteFile(serial_handle, buf, 1, &count, NULL);

      }

      // Read UART

      for(;;)

      {

         length = SerialRead(buf, sizeof(buf));

         if(length == 0)

            break;

         buf[length] = 0;

         printf("%s", buf);

      }

      // Read Ethernet

      for(;;)

      {

         struct pcap_pkthdr header;

         const u_char *pkt_data;

         pkt_data = pcap_next(adhandle, &header);

         if(pkt_data == NULL)

            break;

         if(EthernetActive)

            packet_handler(NULL, &header, pkt_data);

      }

      Sleep(10);

      ticks = GetTickCount();

      if(ticks - ticksLast > 1000)

      {

#ifdef SIMULATE_PLASMA

         IPTick();

#endif

         ticksLast = ticks;

      }

   }

}