ppp.rar_ppp_ppp 单片机_ppp协议_单片机 PPP

//PPP.C //Point-to-Point Protocol Implementation /*///////////////////////////////////////////////////////////////////////////// File Name : PPP.C Author : Rene Trenado Location : Motorola Applications Lab, Baja California Date Created : September 2000 Current Revision : 0.0 Notes : This file contains the code for the PPP module /////////////////////////////////////////////////////////////////////////////*/ //#include <iogp20.h> //#include <string.h> //#include "CommDrv.h" #include "ppp.h" #include "IP.h" #include "Udp.h" #include "ICMP.h" const char * User = "MyName"; // Username of ISP account const char * Password = "MyPassword"; // Password of username /************************* Private Functions *************************/ static void HandleLCPOptions (void); static void HandleIPCPOptions (void); static WORD PPPfcs16 (WORD fcs, BYTE *cp, int len); static void RejectProtocol (BYTE *InBuffer); ////////////////////// Protected ROM Data ///////////////////////// static const BYTE PPPData [] = { 0xff,0x03,0xc0,0x21,0x02,0x01,0x00,0x04,0x00,0x00 }; static const BYTE LCPTerminate[] = { 0xff,0x03,0xc0,0x21,0x05,0x04,0x00,0x04,0x80,0xfe }; static 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 BYTE PPPStatus = 0; BYTE InBuffer [PPP_BUFFER_SIZE + 1];/// Input Buffer for PPP data BYTE OutBuffer[PPP_BUFFER_SIZE + 1];/// Output Buffer for PPP data ///////////////////// Protected R A M Data ///////////////////////// static BYTE *PPP_Packet = InBuffer; static volatile BYTE FrameSize = 0; static EventProc PPPEntryProc; /*********************************************************************** Function : PPPInit Parameters : None Date : September 2000 Desc : Initialize the PPP Module ***********************************************************************/ void PPPInit(void) { PPPStatus |= ReSync; } /*********************************************************************** Function : PPPGetInputBuffer Parameters : None Date : September 2000 Desc : Returns a PPP Input Buffer pointer to caller ***********************************************************************/ BYTE *PPPGetInputBuffer (void) { return &InBuffer[0]; } /*********************************************************************** Function : PPPGetOutputBuffer Parameters : None Date : September 2000 Desc : Returns a pointer to PPP Output Buffer to caller ***********************************************************************/ BYTE *PPPGetOutputBuffer (void) { return &OutBuffer[0]; } /*********************************************************************** Function : PPPfcs16 Parameters : fcs: current fcs cp: pointer to PPP data len: size of PPP data Date : September 2000 Desc : Calculate a new fcs given the current fcs and the new data. ***********************************************************************/ static WORD PPPfcs16 (WORD fcs, BYTE *cp, int 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 Date : September 2000 Desc : Returns the Checksum of the PPP Packet pointed by cp ***********************************************************************/ WORD PPPGetChecksum (register unsigned char *cp, register int len) { return ~PPPfcs16( PPPINITFCS16, cp, len ); } /*********************************************************************** Function : ProcPPPReceive Parameters : A Byte character to stream in a PPP Packet Date : August 2000 Desc : This function process a BYTE following HDLC - PPP specifications. The Async event on input driver should call this function (usually the COMM ISR). ***********************************************************************/ void ProcPPPReceive (register BYTE c) { PPPStatus |= ByteRx; if (PPPStatus & IsFrame) return; if (PPPStatus & ReSync) { if (c != 0x7E) return; PPPStatus &= ~ReSync; FrameSize = 0; } if (PPPStatus & IsESC) { PPP_Packet [FrameSize++] = 0x20 ^ c; PPPStatus &= ~IsESC; } else { switch (c) { case ESC: // Special ESC (0x7D) Character received PPPStatus |= IsESC; break; case END: // Special END (0x7E) Character received // Avoid cero length packets (0x7F - 0x7F // conditions); if (FrameSize > 0) { PPP_Packet [FrameSize] = 0; PPPStatus |= IsFrame;// Signal Frame availability } break; default: PPP_Packet [FrameSize++] = c; if (FrameSize > (PPP_BUFFER_SIZE - 6)) { FrameSize = 0; PPPStatus |= ReSync; } break; } } } /*********************************************************************** Function : PPPSend Parameters : Buffer: A pointer to a buffer containing the PPP packet to send len: the size of the PPP packet Date : September 2000 Desc : Sends a BYTE array of len length following HDLC - PPP specifications ***********************************************************************/ void ProcPPPSend (BYTE *Buffer, BYTE len) { WORD Checksum = 0; Checksum = PPPGetChecksum (Buffer, Buffer[7] + 4); Buffer [Buffer[7]+4] = Checksum & 0xFF; Buffer [Buffer[7]+5] = (Checksum >> 8) & 0xFF; WriteComm (0x7E); while (len--) { if ((signed char)*Buffer < (signed char)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 : public PPPFrameSize Parameters : None Date : August 2000 Desc : Returns the size of the current available PPP packet stored in InBuffer. Caller should call this function if needed on