teraterm/teraterm/telnet.c

/*
 * Copyright (C) 1994-1998 T. Teranishi
 * (C) 2007-2017 TeraTerm Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *   2. Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *   3. The name of the author may not be used to endorse or promote products derived
 *      from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 */

/* TERATERM.EXE, TELNET routines */

#include "teraterm.h"
#include "tttypes.h"
#include <stdio.h>
#include <string.h>
#include "ttcommon.h"
#include "ttwinman.h"
#include "commlib.h"
#include <time.h>
#include <process.h>

#include "telnet.h"
#include "tt_res.h"

int TelStatus;

enum OptStatus {No, Yes, WantNo, WantYes};
enum OptQue {Empty, Opposite};

typedef struct {
  BOOL Accept;
  enum OptStatus Status;
  enum OptQue Que;
} TelOpt;
typedef TelOpt *PTelOpt;

typedef struct {
  TelOpt MyOpt[MaxTelOpt+1];
  TelOpt HisOpt[MaxTelOpt+1];
  BYTE SubOptBuff[51];
  int SubOptCount;
  BOOL SubOptIAC;
  BOOL ChangeWinSize;
  POINT WinSize;
  int LogFile;
} TelRec;
typedef TelRec *PTelRec;

static TelRec tr;

static HANDLE keepalive_thread = (HANDLE)-1L;
static HWND keepalive_dialog = NULL;
int nop_interval = 0;

void DefaultTelRec()
{
  int i;

  for (i=0 ; i <= MaxTelOpt ; i++)
  {
    tr.MyOpt[i].Accept = FALSE;
    tr.MyOpt[i].Status = No;
    tr.MyOpt[i].Que = Empty;
    tr.HisOpt[i].Accept = FALSE;
    tr.HisOpt[i].Status = No;
    tr.HisOpt[i].Que = Empty;
  }

  tr.SubOptCount = 0;
  tr.SubOptIAC = FALSE;
  tr.ChangeWinSize = FALSE;
}

void InitTelnet()
{
  TelStatus = TelIdle;

  DefaultTelRec();
  tr.MyOpt[BINARY].Accept = TRUE;
  tr.HisOpt[BINARY].Accept = TRUE;
  tr.MyOpt[SGA].Accept = TRUE;
  tr.HisOpt[SGA].Accept = TRUE;
  tr.HisOpt[ECHO].Accept = TRUE;
  tr.MyOpt[TERMTYPE].Accept = TRUE;
  tr.MyOpt[NAWS].Accept = TRUE;
  tr.HisOpt[NAWS].Accept = TRUE;
  tr.WinSize.x = ts.TerminalWidth;
  tr.WinSize.y = ts.TerminalHeight;

  if ((ts.LogFlag & LOG_TEL) != 0)
    tr.LogFile = _lcreat("TELNET.LOG",0);
  else
    tr.LogFile = 0;
}

void EndTelnet()
{
  if (tr.LogFile != 0)
  {
    tr.LogFile = 0;
    _lclose(tr.LogFile);
  }

  TelStopKeepAliveThread();
}

void TelWriteLog1(BYTE b)
{
  BYTE Temp[3];
  BYTE Ch;

  Temp[0] = 0x20;
  Ch = b / 16;
  if (Ch <= 9)
    Ch = Ch + 0x30;
  else
    Ch = Ch + 0x37;
  Temp[1] = Ch;

  Ch = b & 15;
  if (Ch <= 9)
    Ch = Ch + 0x30;
  else
    Ch = Ch + 0x37;
  Temp[2] = Ch;
  _lwrite(tr.LogFile,Temp,3);
}

void TelWriteLog(PCHAR Buf, int C)
{
  int i;

  _lwrite(tr.LogFile,"\015\012>",3);
  for (i = 0 ; i<= C-1 ; i++)
    TelWriteLog1(Buf[i]);
}

void SendBack(BYTE a, BYTE b)
{
  BYTE Str3[3];

  Str3[0] = IAC;
  Str3[1] = a;
  Str3[2] = b;
  CommRawOut(&cv,Str3,3);
  if (tr.LogFile!=0)
    TelWriteLog(Str3,3);
}

void SendWinSize()
{
  int i;
  BYTE TmpBuff[21];

  i = 0;

  TmpBuff[i] = IAC;
  i++;
  TmpBuff[i] = SB;
  i++;
  TmpBuff[i] = NAWS;
  i++;
  TmpBuff[i] = HIBYTE(tr.WinSize.x);
  i++;
 /* if (LOBYTE(tr.WinSize.x) == IAC)
  {
    tr.SendBackBuff[i] = IAC;
    i++;
  } */
  TmpBuff[i] = LOBYTE(tr.WinSize.x);
  i++;
  TmpBuff[i] = HIBYTE(tr.WinSize.y);
  i++;
 /* if (LOBYTE(tr.WinSize.y) == IAC)
  {
    tr.SendBackBuff[i] = IAC;
    i++;
  } */
  TmpBuff[i] = LOBYTE(tr.WinSize.y);
  i++;
  TmpBuff[i] = IAC;
  i++;
  TmpBuff[i]= SE;
  i++;

  CommRawOut(&cv,TmpBuff,i);
  if (tr.LogFile!=0)
    TelWriteLog(TmpBuff,i);
}

void ParseTelIAC(BYTE b)
{
  switch (b) {
    case SE: break;
    case NOP:
    case DM:
    case BREAK:
    case IP:
    case AO:
    case AYT:
    case EC:
    case EL:
    case GOAHEAD:
      TelStatus = TelIdle;
      break;
    case SB:
      TelStatus = TelSB;
      tr.SubOptCount = 0;
      break;
    case WILLTEL:
      TelStatus = TelWill;
      break;
    case WONTTEL:
      TelStatus = TelWont;
      break;
    case DOTEL:
      TelStatus = TelDo;
      break;
    case DONTTEL:
      TelStatus = TelDont;
      break;
    case IAC:
      TelStatus = TelIdle;
      break;
    default:
      TelStatus = TelIdle;
  }
}

void ParseTelSB(BYTE b)
{
  BYTE TmpStr[51];
  int i;

  if (tr.SubOptIAC)
  {
    tr.SubOptIAC = FALSE;
    switch (b) {
      case SE:
        if ((tr.MyOpt[TERMTYPE].Status == Yes) &&
            (tr.SubOptCount >= 2) &&
            (tr.SubOptBuff[0] == TERMTYPE) &&
            (tr.SubOptBuff[1] == 1))
        {
#if 1
          _snprintf_s(TmpStr, sizeof(TmpStr), _TRUNCATE, "%c%c%c%c%s%c%c", IAC, SB, TERMTYPE, 0, ts.TermType, IAC, SE);
          // 4 �o�C�g���� 0 �����������A������������������
          i = strlen(TmpStr + 4) + 4;
#else
          TmpStr[0] = IAC;
          TmpStr[1] = SB;
          TmpStr[2] = TERMTYPE;
          TmpStr[3] = 0;
          strcpy(&TmpStr[4],ts.TermType);
          i = 4 + strlen(ts.TermType);
          TmpStr[i] = IAC;
          i++;
          TmpStr[i] = SE;
          i++;
#endif
          CommRawOut(&cv,TmpStr,i);

          if (tr.LogFile!=0)
            TelWriteLog(TmpStr,i);
        }
        else if ( /* (tr.HisOpt[NAWS].Status == Yes) && */
                 (tr.SubOptCount >= 5) &&
                 (tr.SubOptBuff[0] == NAWS))
        {
          tr.WinSize.x = tr.SubOptBuff[1]*256+
                         tr.SubOptBuff[2];
          tr.WinSize.y = tr.SubOptBuff[3]*256+
                         tr.SubOptBuff[4];
          tr.ChangeWinSize = TRUE;
        }
        tr.SubOptCount = 0;
        TelStatus = TelIdle;
        return ;
      /* case IAC: braek; */
      default:
        if (tr.SubOptCount >= sizeof(tr.SubOptBuff)-1)
        {
          tr.SubOptCount = 0;
          TelStatus = TelIdle;
          return;
        }
        else {
          tr.SubOptBuff[tr.SubOptCount] = IAC;
          tr.SubOptCount++;
          if (b==IAC)
          {
            tr.SubOptIAC = TRUE;
            return;
          }
        }
    }
  }
  else
    if (b==IAC)
    {
      tr.SubOptIAC = TRUE;
      return;
    }

  if (tr.SubOptCount >= sizeof(tr.SubOptBuff)-1)
  {
    tr.SubOptCount = 0;
    tr.SubOptIAC = FALSE;
    TelStatus = TelIdle;
  }
  else {
    tr.SubOptBuff[tr.SubOptCount] = b;
    tr.SubOptCount++;
  }
}

void ParseTelWill(BYTE b)
{
  if (b <= MaxTelOpt)
  {
    switch (tr.HisOpt[b].Status) {
      case No:
        if (tr.HisOpt[b].Accept)
        {
          SendBack(DOTEL,b);
          tr.HisOpt[b].Status = Yes;
        }
        else
          SendBack(DONTTEL,b);
        break;

      case WantNo:
        switch (tr.HisOpt[b].Que) {
          case Empty:
            tr.HisOpt[b].Status = No;
            break;
          case Opposite:
            tr.HisOpt[b].Status = Yes;
            break;
        }
        break;

      case WantYes:
        switch (tr.HisOpt[b].Que) {
          case Empty:
            tr.HisOpt[b].Status = Yes;
            break;
          case Opposite:
            tr.HisOpt[b].Status = WantNo;
            tr.HisOpt[b].Que = Empty;
            SendBack(DONTTEL,b);
            break;
        }
        break;
    }
  }
  else
    SendBack(DONTTEL,b);

  switch (b) {
    case ECHO:
      if (ts.TelEcho>0)
        switch (tr.HisOpt[ECHO].Status) {
          case Yes:
            ts.LocalEcho = 0;
            break;
          case No:
            ts.LocalEcho = 1;
            break;
        }
      if (tr.HisOpt[ECHO].Status == Yes) {
        cv.TelLineMode = FALSE;
      }
      break;
    case SGA:
      if (tr.HisOpt[SGA].Status == Yes) {
        cv.TelLineMode = FALSE;
      }
      break;
    case BINARY:
      switch (tr.HisOpt[BINARY].Status) {
        case Yes:
          cv.TelBinRecv = TRUE;
          break;
        case No:
          cv.TelBinRecv = FALSE;
          break;
      }
      break;
  }
  TelStatus = TelIdle;
}

void ParseTelWont(BYTE b)
{
  if (b <= MaxTelOpt)
  {
    switch (tr.HisOpt[b].Status) {
      case Yes:
        tr.HisOpt[b].Status = No;
        SendBack(DONTTEL,b);
        break;

      case WantNo:
        switch (tr.HisOpt[b].Que) {
          case Empty:
            tr.HisOpt[b].Status = No;
            break;
          case Opposite:
            tr.HisOpt[b].Status = WantYes;
            tr.HisOpt[b].Que = Empty;
            SendBack(DOTEL,b);
            break;
        }
        break;

      case WantYes:
        switch (tr.HisOpt[b].Que) {
          case Empty:
            tr.HisOpt[b].Status = No;
            break;
          case Opposite:
            tr.HisOpt[b].Status = No;
            tr.HisOpt[b].Que = Empty;
            break;
        }
        break;
    }
  }
  else
    SendBack(DONTTEL,b);

  switch (b) {
    case ECHO:
      if (ts.TelEcho>0)
        switch (tr.HisOpt[ECHO].Status) {
          case Yes:
            ts.LocalEcho = 0;
            break;
          case No:
            ts.LocalEcho = 1;
            break;
        }
        break;
      if (tr.HisOpt[ECHO].Status == Yes) {
        cv.TelLineMode = FALSE;
      }
    case BINARY:
      switch (tr.HisOpt[BINARY].Status) {
        case Yes:
          cv.TelBinRecv = TRUE;
          break;
        case No:
          cv.TelBinRecv = FALSE;
          break;
      }
      break;
  }
  TelStatus = TelIdle;
}

void ParseTelDo(BYTE b)
{
  if (b <= MaxTelOpt)
  {
    switch (tr.MyOpt[b].Status) {
      case No:
        if (tr.MyOpt[b].Accept)
        {
          tr.MyOpt[b].Status = Yes;
          SendBack(WILLTEL,b);
        }
        else
          SendBack(WONTTEL,b);
        break;

      case WantNo:
        switch (tr.MyOpt[b].Que) {
          case Empty:
            tr.MyOpt[b].Status = No;
            break;
          case Opposite:
            tr.MyOpt[b].Status = Yes;
            break;
        }
        break;

      case WantYes:
        switch (tr.MyOpt[b].Que) {
          case Empty:
            tr.MyOpt[b].Status = Yes;
            break;
          case Opposite:
            tr.MyOpt[b].Status = WantNo;
            tr.MyOpt[b].Que = Empty;
            SendBack(WONTTEL,b);
            break;
        }
        break;
    }
  }
  else
    SendBack(WONTTEL,b);

  switch (b) {
    case BINARY:
      switch (tr.MyOpt[BINARY].Status) {
        case Yes:
          cv.TelBinSend = TRUE;
          break;
        case No:
          cv.TelBinSend = FALSE;
          break;
      }
      break;
    case NAWS:
      if (tr.MyOpt[NAWS].Status==Yes)
        SendWinSize();
      break;
    case SGA:
      if (tr.MyOpt[SGA].Status==Yes)
        cv.TelLineMode = FALSE;
      break;
  }
  TelStatus = TelIdle;
}

void ParseTelDont(BYTE b)
{
  if (b <= MaxTelOpt)
  {
    switch (tr.MyOpt[b].Status) {
      case Yes:
        tr.MyOpt[b].Status = No;
        SendBack(WONTTEL,b);
        break;

      case WantNo:
        switch (tr.MyOpt[b].Que) {
          case Empty:
            tr.MyOpt[b].Status = No;
            break;
          case Opposite:
            tr.MyOpt[b].Status = WantYes;
            tr.MyOpt[b].Que = Empty;
            SendBack(WILLTEL,b);
            break;
        }
        break;

      case WantYes:
        switch (tr.MyOpt[b].Que) {
          case Empty:
            tr.MyOpt[b].Status = No;
            break;
          case Opposite:
            tr.MyOpt[b].Status = No;
            tr.MyOpt[b].Que = Empty;
            break;
        }
        break;
    }
  }
  else
    SendBack(WONTTEL,b);

  switch (b) {
    case BINARY:
      switch (tr.MyOpt[BINARY].Status) {
        case Yes:
          cv.TelBinSend = TRUE;
          break;
        case No:
          cv.TelBinSend = FALSE;
          break;
      }
      break;
  }
  TelStatus = TelIdle;
}

void ParseTel(BOOL *Size, int *nx, int *ny)
{
  BYTE b;
  int c;

  c = CommReadRawByte(&cv,&b);

  while ((c>0) && (cv.TelMode))
  {
    if (tr.LogFile!=0)
    {
      if (TelStatus==TelIAC)
      {
        _lwrite(tr.LogFile,"\015\012<",3);
        TelWriteLog1(0xff);
      }
      TelWriteLog1(b);
    }

    tr.ChangeWinSize = FALSE;

    switch (TelStatus) {
      case TelIAC: ParseTelIAC(b); break;
      case TelSB: ParseTelSB(b); break;
      case TelWill: ParseTelWill(b); break;
      case TelWont: ParseTelWont(b); break;
      case TelDo: ParseTelDo(b); break;
      case TelDont: ParseTelDont(b); break;
      case TelNop: TelStatus = TelIdle; break;
    }
    if (TelStatus == TelIdle) cv.TelMode = FALSE;

    if (cv.TelMode) c = CommReadRawByte(&cv,&b);
  }

  *Size = tr.ChangeWinSize;
  *nx = tr.WinSize.x;
  *ny = tr.WinSize.x;
}

void TelEnableHisOpt(BYTE b)
{
  if (b <= MaxTelOpt)
  {
    switch (tr.HisOpt[b].Status) {
      case No:
        tr.HisOpt[b].Status = WantYes;
        SendBack(DOTEL,b);
        break;

      case WantNo:
        if (tr.HisOpt[b].Que==Empty)
          tr.HisOpt[b].Que = Opposite;
        break;

      case WantYes:
        if (tr.HisOpt[b].Que==Opposite)
          tr.HisOpt[b].Que = Empty;
        break;
    }
  }
}

void TelDisableHisOpt(BYTE b)
{
  if (b <= MaxTelOpt)
  {
    switch (tr.HisOpt[b].Status) {
      case Yes:
        tr.HisOpt[b].Status = WantNo;
        SendBack(DONTTEL,b);
        break;

      case WantNo:
        if (tr.HisOpt[b].Que==Opposite)
          tr.HisOpt[b].Que = Empty;
        break;

      case WantYes:
        if (tr.HisOpt[b].Que==Empty)
          tr.HisOpt[b].Que = Opposite;
        break;
    }
  }
}

void TelEnableMyOpt(BYTE b)
{
  if (b <= MaxTelOpt)
  {
    switch (tr.MyOpt[b].Status) {
      case No:
        tr.MyOpt[b].Status = WantYes;
        SendBack(WILLTEL,b);
        break;

      case WantNo:
        if (tr.MyOpt[b].Que==Empty)
          tr.MyOpt[b].Que = Opposite;
        break;

      case WantYes:
        if (tr.MyOpt[b].Que==Opposite)
          tr.MyOpt[b].Que = Empty;
        break;
    }
  }
}

void TelDisableMyOpt(BYTE b)
{
  if (b <= MaxTelOpt)
  {
    switch (tr.MyOpt[b].Status) {
      case Yes:
        tr.MyOpt[b].Status = WantNo;
        SendBack(WONTTEL,b);
        break;

      case WantNo:
        if (tr.MyOpt[b].Que==Opposite)
          tr.MyOpt[b].Que = Empty;
        break;

      case WantYes:
        if (tr.MyOpt[b].Que==Empty)
          tr.MyOpt[b].Que = Opposite;
        break;
    }
  }
}

void TelInformWinSize(int nx, int ny)
{
  if ((tr.MyOpt[NAWS].Status==Yes) &&
      ((nx!=tr.WinSize.x) ||
       (ny!=tr.WinSize.y)))
  {
    tr.WinSize.x = nx;
    tr.WinSize.y = ny;
    SendWinSize();
  }
}

void TelSendAYT()
{
  BYTE Str[2];

  Str[0] = IAC;
  Str[1] = AYT;
  CommRawOut(&cv,Str,2);
  CommSend(&cv);
  if (tr.LogFile!=0)
    TelWriteLog(Str,2);
}

void TelSendBreak()
{
  BYTE Str[2];

  Str[0] = IAC;
  Str[1] = BREAK;
  CommRawOut(&cv,Str,2);
  CommSend(&cv);
  if (tr.LogFile!=0)
    TelWriteLog(Str,2);
}

void TelChangeEcho()
{
  if (ts.LocalEcho==0)
    TelEnableHisOpt(ECHO);
  else
    TelDisableHisOpt(ECHO);
}

void TelSendNOP()
{
  BYTE Str[2];

  Str[0] = IAC;
  Str[1] = NOP;
  CommRawOut(&cv,Str,2);
  CommSend(&cv);
  if (tr.LogFile!=0)
    TelWriteLog(Str,2);
}

#define WM_SEND_HEARTBEAT (WM_USER + 1)

static LRESULT CALLBACK telnet_heartbeat_dlg_proc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
{

        switch (msg) {
                case WM_INITDIALOG:
                        return FALSE;

                case WM_SEND_HEARTBEAT:
                        TelSendNOP();
                        return TRUE;
                        break;

                case WM_COMMAND:
                        switch (wp) {
                        }

                        switch (LOWORD(wp)) {
                                case IDOK:
                                        {
                                        return TRUE;
                                        }

                                case IDCANCEL:
                                        EndDialog(hWnd, 0);
                                        return TRUE;
                                default:
                                        return FALSE;
                        }
                        break;

                case WM_CLOSE:
                        // close�{�^���������������� window ���������������������B
                        return TRUE;

                case WM_DESTROY:
                        return TRUE;

                default:
                        return FALSE;
        }
        return TRUE;
}


static unsigned _stdcall TelKeepAliveThread(void *dummy) {
  static int instance = 0;

  if (instance > 0)
    return 0;
  instance++;

  while (cv.Open && nop_interval > 0) {
    if (time(NULL) >= cv.LastSendTime + nop_interval) {
                SendMessage(keepalive_dialog, WM_SEND_HEARTBEAT, 0, 0);
    }

    Sleep(100);
  }
  instance--;
  return 0;
}

void TelStartKeepAliveThread() {
  unsigned tid;

  if (ts.TelKeepAliveInterval > 0) {
    nop_interval = ts.TelKeepAliveInterval;

        // ���[�h���X�_�C�A���O������ (2007.12.26 yutaka)
        keepalive_dialog = CreateDialog(hInst, MAKEINTRESOURCE(IDD_BROADCAST_DIALOG),
               HVTWin, (DLGPROC)telnet_heartbeat_dlg_proc);

    keepalive_thread = (HANDLE)_beginthreadex(NULL, 0, TelKeepAliveThread, NULL, 0, &tid);
    if (keepalive_thread == (HANDLE)-1) {
      nop_interval = 0;
    }
  }
}

void TelStopKeepAliveThread() {
  if (keepalive_thread != (HANDLE)-1L) {
    nop_interval = 0;
    WaitForSingleObject(keepalive_thread, INFINITE);
    CloseHandle(keepalive_thread);
    keepalive_thread = (HANDLE)-1L;

        DestroyWindow(keepalive_dialog);
  }
}

void TelUpdateKeepAliveInterval() {
  if (cv.Open && cv.TelFlag && ts.TCPPort==ts.TelPort) {
    if (ts.TelKeepAliveInterval > 0 && keepalive_thread == (HANDLE)-1)
      TelStartKeepAliveThread();
    else if (ts.TelKeepAliveInterval == 0 && keepalive_thread != (HANDLE)-1)
      TelStopKeepAliveThread();
    else
      nop_interval = ts.TelKeepAliveInterval;
  }
}