gprs_ppp.cpp

gprs协议实现

/*******************************************************************************
File Name : PPP.C
Date Created : September 2000
Notes : This file contains the code for the PPP module
*******************************************************************************/
#include <stdio.h>
#include <string.h>
#include "gprs_net.h"
#include "gprs_PPP.h"
#include "gprs_IP.h"
#include "gprs_UDP.h"
#include "unit1.h"

const unsigned char  User[] = 	"UserID";		// Username of ISP account
const unsigned char  Password[] = "Password";		// Password of username

unsigned short Uart_Receive_Count ;		//uart receive packet len 
extern NODE  locnode;                      /* My  IP addresses and port*/
extern NODE  hostnode;                     /* host node */


/************************* Private Functions *************************/
static void HandleLCPOptions (void);
static void HandleIPCPOptions (void);
static unsigned short PPPfcs16 (unsigned short fcs, unsigned char *cp, unsigned short len);
static void RejectProtocol (unsigned char *InBuffer);
void WriteComm(unsigned char c);
void WriteComm(unsigned char c)
{
};
////////////////////// Protected ROM Data /////////////////////////
const unsigned char PPPData [] = {
	0xff,0x03,0xc0,0x21,0x02,0x01,0x00,0x04,0x00,0x00
};

const unsigned char LCPTerminate[] = {
	0xff,0x03,0xc0,0x21,0x05,0x04,0x00,0x04,0x80,0xfe
};

const unsigned char IPCPData[] = {
	0xff,0x03,0x80,0x21,0x01,0x01,0x00,0x0A,0x03,0x06,0x00,0x00,0x00,0x00
};

const unsigned short fcstab[256] = {
	0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
	0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
	0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
	0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
	0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
	0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
	0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
	0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
	0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
	0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
	0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
	0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
	0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
	0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
	0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
	0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
	0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
	0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
	0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
	0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
	0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
	0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
	0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
	0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
	0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
	0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
	0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
	0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
	0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
	0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
	0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
	0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};

///////////////////// Public  R A M  Data /////////////////////////////
volatile unsigned char	PPPStatus = 0;
unsigned char InBuffer[MAXDATA];
unsigned char OutBuffer[MAXDATA];


///////////////////// Protected  R A M   Data /////////////////////////
static unsigned char		*PPP_Packet = InBuffer;
static volatile unsigned char 	FrameSize = 0;
/***********************************************************************
Function : 	PPPfcs16
Parameters : 	fcs: current fcs
		cp: pointer to PPP data
		len: size of PPP data
Desc : 		Calculate a new fcs given the current fcs and the new data.
***********************************************************************/

static unsigned short PPPfcs16 (unsigned short fcs, unsigned char *cp, unsigned short len) {
	   while (len--)
		   fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff];
       return (fcs);
}
/***********************************************************************
Function : 	public PPPGetChecksum
Parameters : 	cp:		A pinter to the PPP Packet
		len:		Size of PPP Packet
Desc : 		Returns the Checksum of the PPP Packet pointed by cp
***********************************************************************/

unsigned short PPPGetChecksum (register unsigned char *cp,register unsigned short len) {
	   return ~PPPfcs16( PPPINITFCS16, cp, len );
}

/***********************************************************************
Function : 	PPPSend

Parameters : 	Buffer:	A pointer to a buffer containing the PPP packet to send
		len:	the size of the PPP packet
Desc : 		Sends a BYTE array of len length following HDLC - PPP specifications

***********************************************************************/
////  for microcontroller
void ProcPPPSend (unsigned char *Buffer, unsigned short len) {
unsigned short Checksum ;
unsigned short i=0;
char TransBuf[2048];
/*
	Checksum = PPPGetChecksum (Buffer, Buffer[7] + 4);
	Buffer [Buffer[7]+4] = Checksum & 0xFF;
	Buffer [Buffer[7]+5] = (Checksum >> 8) & 0xFF;
*/
        unsigned short temp;
	temp=Buffer[6];
	temp=(temp<<8)+Buffer[7];
	Checksum = PPPGetChecksum (Buffer, temp + 4);
	Buffer [temp+4] = Checksum & 0xFF;
	Buffer [temp+5] = (Checksum >> 8) & 0xFF;

        int j;
        AnsiString MyHexStr;
        AnsiString TempString;
        MyHexStr="发送数据：";
                TempString=IntToHex(0x7e,2);
                MyHexStr+=TempString.SubString(TempString.Length()-1,2);
                MyHexStr+=" ";

        for (j=0;j<len;j++)
        {
                TempString=IntToHex(Buffer[j],2);
                MyHexStr+=TempString.SubString(TempString.Length()-1,2);
                MyHexStr+=" ";
        }
                TempString=IntToHex(0x7e,2);
                MyHexStr+=TempString.SubString(TempString.Length()-1,2);
                MyHexStr+=" ";

        Form1->RichEdit1->Lines->Add(MyHexStr);

        TransBuf[i++]=0x7E;
	while (len--) {
		if (*Buffer < 0x20) {
                        TransBuf[i++]=0x7D;
                        TransBuf[i++]=*Buffer ^ 0x20;
		} else {
			switch (*Buffer) {
				case 0x7E:
                                        TransBuf[i++]=0x7D;
                                        TransBuf[i++]=*Buffer ^ 0x20;
				break;

				case 0x7D:
                                        TransBuf[i++]=0x7D;
                                        TransBuf[i++]=*Buffer ^ 0x20;
				break;

				default:
                                        TransBuf[i++]=*Buffer;
				break;
			}
		}
		Buffer++;
	}
        TransBuf[i++]=0x7E;
	Form1->ComPort1->WriteStr(AnsiString(TransBuf).SubString(1,i));
 /*
        int j;
        AnsiString MyHexStr;
        AnsiString TempString;
        MyHexStr="发送数据：";
        for (j=0;j<i;j++)
        {
                TempString=IntToHex(TransBuf[j],2);
                MyHexStr+=TempString.SubString(TempString.Length()-1,2);
                MyHexStr+=" ";
        }
        Form1->RichEdit2->Lines->Add(MyHexStr);
 */
}

//  for microcontroller
/*
void ProcPPPSend (unsigned char *Buffer, unsigned short len) {
unsigned short Checksum ;
unsigned short temp;
	temp=Buffer[6];
	temp=temp<<8 +Buffer[7];
	Checksum = PPPGetChecksum (Buffer, temp + 4);
	Buffer [temp+4] = Checksum & 0xFF;
	Buffer [temp+5] = (Checksum >> 8) & 0xFF;
	WriteComm(0x7E);
	while (len--) {
		if (*Buffer < 0x20) {
                        WriteComm(0x7D);
                        WriteComm(*Buffer ^ 0x20);
		} else {
			switch (*Buffer) {
				case 0x7E:
                                        WriteComm(0x7D);
                                        WriteComm(0x5E);
				break;
				case 0x7D:
                                        WriteComm(0x7D);
                                        WriteComm(0x5D);
				break;
				default:
                                        WriteComm(*Buffer);
				break;
			}
		}
		Buffer++;
	}
        WriteComm(0x7E);
}
  */
/***********************************************************************
Function : 	protected HandleLCPOptions

Parameters : 	None

Desc : 		State Machine that implements LCP packet negotiation

***********************************************************************/
static void HandleLCPOptions (void) {
unsigned char *dest = OutBuffer;					// A pointer to the options of output buffer
unsigned char *ptr = (unsigned char *)&InBuffer[8];			// A pointer to the options of input buffer

//  because ppp lcp frame length ,256  so get length from  InBuffer[7]
 
	switch (InBuffer [4] ) {	//   typecode
		//++++++++++++++++++++++++++++++++++++++++++++++++++++
		case TERMINATE:			//"Server Terminate-Request received"
			memmove (OutBuffer, InBuffer, InBuffer[7]+6);
			OutBuffer [4] = TERMINATE_ACK;
			ProcPPPSend ((unsigned char *)OutBuffer, OutBuffer[7] + 6);
			PPPStatus &= ~LinkOn;
		break;
		//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
		case REQ:		
			// Server requesting option 2 
			// FirstOption is InBuffer [8]
			// FirstOption Length is Inbuffer[9]
			// Option 2 is Async-Control-Character-Map,all 0xFF imply value 0f Character .LT. 32 is all Escape    
			if ((InBuffer [8] == 0x02) && (InBuffer[7] <= 0x0A))  {
					if ((InBuffer [10] == 0xFF) &&
						(InBuffer [11] == 0xFF) &&
						(InBuffer [12] == 0xFF) &&
						(InBuffer [13] == 0xFF)) {
						InBuffer [4] = ACK;
						ProcPPPSend (InBuffer, InBuffer [7] + 6);
						return;
					}
			} else
			// Server requesting first options, reject all but 3 
			// InBuffer [7] > 9 imply Options isn't only Option 3 			
			if ((InBuffer [8] != 0x03) && (InBuffer [7] > 9)) {
			unsigned char OptionsSize;
			unsigned char Option;
			unsigned char Size;
				memmove (OutBuffer, InBuffer, 8);			// memmove LCP header to output buffer
				OutBuffer [4] = REJ;					// Output will be a reject packet
				dest += 8;						// Offset output pointer to LCP options
				OptionsSize = InBuffer[7] - 4;				// Get size of LCP options in bytes
				while (OptionsSize > 0) {				// Is there options to process?
					Option = *ptr;					// Get option number
					Size = *(ptr + 1);				// Get size of this option
					OptionsSize -= Size;				// Reduce the amount of OptionsSize
					if (Option == 3) {				// Is this option 3? (authentication protocol)
						ptr += Size;				// Remove this option in output packet
						OutBuffer [7] = OutBuffer [7] - Size;	// Set New Packet size
					}
					else
                                        {
						while (Size-- ) {			// Copy this option to the output buffer
							*dest++ = *ptr++;
						}
					}
				}
			} else
			// 	Server Request CHAP protocol, We reply with
			//	 a suggestion of the PAP protocol instead
			if ((InBuffer [8] == 0x03) && (InBuffer [10] == 0xC2)) {
				InBuffer [4] = NAK;					// NAK CHAP protocol
				InBuffer [10] = 0xC0;					// We suggest PAP instead
				ProcPPPSend (InBuffer, InBuffer[7]+6);			// Send the NAK reply
				return;
			} else
			//	 Server Request PAP protocol 
			//	 We Acknowledge this reply and then we start negotiating
			//	 the Async-Control-Char..., Here we send both packets!!!
				if ((InBuffer [8] == 0x03) && (InBuffer [10] == 0xC0)) {
					memmove (OutBuffer, InBuffer, InBuffer[7]+6);
					OutBuffer[4] = ACK;
					ProcPPPSend ((unsigned char *)OutBuffer, OutBuffer[7] + 6);
					OutBuffer[4] = REQ;
					OutBuffer[5] = OutBuffer [5] + 1;
					OutBuffer[7] = 0x0A;