/src/FreeRDP/winpr/libwinpr/comm/comm.c

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/**
 * WinPR: Windows Portable Runtime
 * Serial Communication API
 *
 * Copyright 2011 O.S. Systems Software Ltda.
 * Copyright 2011 Eduardo Fiss Beloni <beloni@ossystems.com.br>
 * Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 * Copyright 2014 Hewlett-Packard Development Company, L.P.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <winpr/config.h>

#include <winpr/assert.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdarg.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <termios.h>
#include <unistd.h>

#include <winpr/crt.h>
#include <winpr/comm.h>
#include <winpr/tchar.h>
#include <winpr/wlog.h>
#include <winpr/handle.h>

#include "comm_ioctl.h"

#include "../log.h"
#define TAG WINPR_TAG("comm")

/**
 * Communication Resources:
 * http://msdn.microsoft.com/en-us/library/windows/desktop/aa363196/
 */

#include "comm.h"

static wLog* sLog = NULL;

struct comm_device
{
  LPTSTR name;
  LPTSTR path;
};

typedef struct comm_device COMM_DEVICE;

/* FIXME: get a clever data structure, see also io.h functions */
/* _CommDevices is a NULL-terminated array with a maximun of COMM_DEVICE_MAX COMM_DEVICE */
#define COMM_DEVICE_MAX 128
static COMM_DEVICE** sCommDevices = NULL;
static CRITICAL_SECTION sCommDevicesLock;

static HANDLE_CREATOR sCommHandleCreator = { 0 };

static pthread_once_t sCommInitialized = PTHREAD_ONCE_INIT;

static int CommGetFd(HANDLE handle)
{
  WINPR_COMM* comm = (WINPR_COMM*)handle;

  if (!CommIsHandled(handle))
    return -1;

  return comm->fd;
}

HANDLE_CREATOR* GetCommHandleCreator(void)
{
  sCommHandleCreator.IsHandled = IsCommDevice;
  sCommHandleCreator.CreateFileA = CommCreateFileA;
  return &sCommHandleCreator;
}

static void CommInit(void)
{
  /* NB: error management to be done outside of this function */
  WINPR_ASSERT(sLog == NULL);
  WINPR_ASSERT(sCommDevices == NULL);
  sCommDevices = (COMM_DEVICE**)calloc(COMM_DEVICE_MAX + 1, sizeof(COMM_DEVICE*));

  if (!sCommDevices)
    return;

  if (!InitializeCriticalSectionEx(&sCommDevicesLock, 0, 0))
  {
    free(sCommDevices);
    sCommDevices = NULL;
    return;
  }

  sLog = WLog_Get(TAG);
  WINPR_ASSERT(sLog != NULL);
}

/**
 * Returns TRUE when the comm module is correctly intialized, FALSE otherwise
 * with ERROR_DLL_INIT_FAILED set as the last error.
 */
static BOOL CommInitialized(void)
{
  if (pthread_once(&sCommInitialized, CommInit) != 0)
  {
    SetLastError(ERROR_DLL_INIT_FAILED);
    return FALSE;
  }

  return TRUE;
}

void CommLog_Print(DWORD level, ...)
{
  if (!CommInitialized())
    return;

  va_list ap;
  va_start(ap, level);
  WLog_PrintVA(sLog, level, ap);
  va_end(ap);
}

BOOL BuildCommDCBA(LPCSTR lpDef, LPDCB lpDCB)
{
  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */
  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL BuildCommDCBW(LPCWSTR lpDef, LPDCB lpDCB)
{
  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */
  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL BuildCommDCBAndTimeoutsA(LPCSTR lpDef, LPDCB lpDCB, LPCOMMTIMEOUTS lpCommTimeouts)
{
  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */
  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL BuildCommDCBAndTimeoutsW(LPCWSTR lpDef, LPDCB lpDCB, LPCOMMTIMEOUTS lpCommTimeouts)
{
  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */
  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL CommConfigDialogA(LPCSTR lpszName, HWND hWnd, LPCOMMCONFIG lpCC)
{
  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */
  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL CommConfigDialogW(LPCWSTR lpszName, HWND hWnd, LPCOMMCONFIG lpCC)
{
  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */
  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL GetCommConfig(HANDLE hCommDev, LPCOMMCONFIG lpCC, LPDWORD lpdwSize)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hCommDev;

  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */

  if (!pComm)
    return FALSE;

  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL SetCommConfig(HANDLE hCommDev, LPCOMMCONFIG lpCC, DWORD dwSize)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hCommDev;

  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */

  if (!pComm)
    return FALSE;

  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL GetCommMask(HANDLE hFile, PDWORD lpEvtMask)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;

  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */

  if (!pComm)
    return FALSE;

  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL SetCommMask(HANDLE hFile, DWORD dwEvtMask)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;

  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */

  if (!pComm)
    return FALSE;

  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL GetCommModemStatus(HANDLE hFile, PDWORD lpModemStat)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;

  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */

  if (!pComm)
    return FALSE;

  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

/**
 * ERRORS:
 *   ERROR_DLL_INIT_FAILED
 *   ERROR_INVALID_HANDLE
 */
BOOL GetCommProperties(HANDLE hFile, LPCOMMPROP lpCommProp)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;
  DWORD bytesReturned = 0;

  if (!CommIsHandleValid(hFile))
    return FALSE;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_GET_PROPERTIES, NULL, 0, lpCommProp,
                           sizeof(COMMPROP), &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "GetCommProperties failure.");
    return FALSE;
  }

  return TRUE;
}

/**
 *
 *
 * ERRORS:
 *   ERROR_INVALID_HANDLE
 *   ERROR_INVALID_DATA
 *   ERROR_IO_DEVICE
 *   ERROR_OUTOFMEMORY
 */
BOOL GetCommState(HANDLE hFile, LPDCB lpDCB)
{
  DCB* lpLocalDcb = NULL;
  struct termios currentState;
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;
  DWORD bytesReturned = 0;

  if (!CommIsHandleValid(hFile))
    return FALSE;

  if (!lpDCB)
  {
    SetLastError(ERROR_INVALID_DATA);
    return FALSE;
  }

  if (lpDCB->DCBlength < sizeof(DCB))
  {
    SetLastError(ERROR_INVALID_DATA);
    return FALSE;
  }

  if (tcgetattr(pComm->fd, &currentState) < 0)
  {
    SetLastError(ERROR_IO_DEVICE);
    return FALSE;
  }

  lpLocalDcb = (DCB*)calloc(1, lpDCB->DCBlength);

  if (lpLocalDcb == NULL)
  {
    SetLastError(ERROR_OUTOFMEMORY);
    return FALSE;
  }

  /* error_handle */
  lpLocalDcb->DCBlength = lpDCB->DCBlength;
  SERIAL_BAUD_RATE baudRate;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_GET_BAUD_RATE, NULL, 0, &baudRate,
                           sizeof(SERIAL_BAUD_RATE), &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "GetCommState failure: could not get the baud rate.");
    goto error_handle;
  }

  lpLocalDcb->BaudRate = baudRate.BaudRate;
  lpLocalDcb->fBinary = (currentState.c_cflag & ICANON) == 0;

  if (!lpLocalDcb->fBinary)
  {
    CommLog_Print(WLOG_WARN, "Unexpected nonbinary mode, consider to unset the ICANON flag.");
  }

  lpLocalDcb->fParity = (currentState.c_iflag & INPCK) != 0;
  SERIAL_HANDFLOW handflow;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_GET_HANDFLOW, NULL, 0, &handflow,
                           sizeof(SERIAL_HANDFLOW), &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "GetCommState failure: could not get the handflow settings.");
    goto error_handle;
  }

  lpLocalDcb->fOutxCtsFlow = (handflow.ControlHandShake & SERIAL_CTS_HANDSHAKE) != 0;
  lpLocalDcb->fOutxDsrFlow = (handflow.ControlHandShake & SERIAL_DSR_HANDSHAKE) != 0;

  if (handflow.ControlHandShake & SERIAL_DTR_HANDSHAKE)
  {
    lpLocalDcb->fDtrControl = DTR_CONTROL_HANDSHAKE;
  }
  else if (handflow.ControlHandShake & SERIAL_DTR_CONTROL)
  {
    lpLocalDcb->fDtrControl = DTR_CONTROL_ENABLE;
  }
  else
  {
    lpLocalDcb->fDtrControl = DTR_CONTROL_DISABLE;
  }

  lpLocalDcb->fDsrSensitivity = (handflow.ControlHandShake & SERIAL_DSR_SENSITIVITY) != 0;
  lpLocalDcb->fTXContinueOnXoff = (handflow.FlowReplace & SERIAL_XOFF_CONTINUE) != 0;
  lpLocalDcb->fOutX = (handflow.FlowReplace & SERIAL_AUTO_TRANSMIT) != 0;
  lpLocalDcb->fInX = (handflow.FlowReplace & SERIAL_AUTO_RECEIVE) != 0;
  lpLocalDcb->fErrorChar = (handflow.FlowReplace & SERIAL_ERROR_CHAR) != 0;
  lpLocalDcb->fNull = (handflow.FlowReplace & SERIAL_NULL_STRIPPING) != 0;

  if (handflow.FlowReplace & SERIAL_RTS_HANDSHAKE)
  {
    lpLocalDcb->fRtsControl = RTS_CONTROL_HANDSHAKE;
  }
  else if (handflow.FlowReplace & SERIAL_RTS_CONTROL)
  {
    lpLocalDcb->fRtsControl = RTS_CONTROL_ENABLE;
  }
  else
  {
    lpLocalDcb->fRtsControl = RTS_CONTROL_DISABLE;
  }

  // FIXME: how to get the RTS_CONTROL_TOGGLE state? Does it match the UART 16750's Autoflow
  // Control Enabled bit in its Modem Control Register (MCR)
  lpLocalDcb->fAbortOnError = (handflow.ControlHandShake & SERIAL_ERROR_ABORT) != 0;
  /* lpLocalDcb->fDummy2 not used */
  lpLocalDcb->wReserved = 0; /* must be zero */
  lpLocalDcb->XonLim = handflow.XonLimit;
  lpLocalDcb->XoffLim = handflow.XoffLimit;
  SERIAL_LINE_CONTROL lineControl;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_GET_LINE_CONTROL, NULL, 0, &lineControl,
                           sizeof(SERIAL_LINE_CONTROL), &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "GetCommState failure: could not get the control settings.");
    goto error_handle;
  }

  lpLocalDcb->ByteSize = lineControl.WordLength;
  lpLocalDcb->Parity = lineControl.Parity;
  lpLocalDcb->StopBits = lineControl.StopBits;
  SERIAL_CHARS serialChars;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_GET_CHARS, NULL, 0, &serialChars,
                           sizeof(SERIAL_CHARS), &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "GetCommState failure: could not get the serial chars.");
    goto error_handle;
  }

  lpLocalDcb->XonChar = serialChars.XonChar;
  lpLocalDcb->XoffChar = serialChars.XoffChar;
  lpLocalDcb->ErrorChar = serialChars.ErrorChar;
  lpLocalDcb->EofChar = serialChars.EofChar;
  lpLocalDcb->EvtChar = serialChars.EventChar;
  memcpy(lpDCB, lpLocalDcb, lpDCB->DCBlength);
  free(lpLocalDcb);
  return TRUE;
error_handle:
  free(lpLocalDcb);
  return FALSE;
}

/**
 * @return TRUE on success, FALSE otherwise.
 *
 * As of today, SetCommState() can fail half-way with some settings
 * applied and some others not. SetCommState() returns on the first
 * failure met. FIXME: or is it correct?
 *
 * ERRORS:
 *   ERROR_INVALID_HANDLE
 *   ERROR_IO_DEVICE
 */
BOOL SetCommState(HANDLE hFile, LPDCB lpDCB)
{
  struct termios upcomingTermios = { 0 };
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;
  DWORD bytesReturned = 0;

  /* FIXME: validate changes according GetCommProperties? */

  if (!CommIsHandleValid(hFile))
    return FALSE;

  if (!lpDCB)
  {
    SetLastError(ERROR_INVALID_DATA);
    return FALSE;
  }

  /* NB: did the choice to call ioctls first when available and
     then to setup upcomingTermios. Don't mix both stages. */
  /** ioctl calls stage **/
  SERIAL_BAUD_RATE baudRate;
  baudRate.BaudRate = lpDCB->BaudRate;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_SET_BAUD_RATE, &baudRate, sizeof(SERIAL_BAUD_RATE),
                           NULL, 0, &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "SetCommState failure: could not set the baud rate.");
    return FALSE;
  }

  SERIAL_CHARS serialChars;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_GET_CHARS, NULL, 0, &serialChars,
                           sizeof(SERIAL_CHARS), &bytesReturned,
                           NULL)) /* as of today, required for BreakChar */
  {
    CommLog_Print(WLOG_WARN, "SetCommState failure: could not get the initial serial chars.");
    return FALSE;
  }

  serialChars.XonChar = lpDCB->XonChar;
  serialChars.XoffChar = lpDCB->XoffChar;
  serialChars.ErrorChar = lpDCB->ErrorChar;
  serialChars.EofChar = lpDCB->EofChar;
  serialChars.EventChar = lpDCB->EvtChar;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_SET_CHARS, &serialChars, sizeof(SERIAL_CHARS),
                           NULL, 0, &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "SetCommState failure: could not set the serial chars.");
    return FALSE;
  }

  SERIAL_LINE_CONTROL lineControl;
  lineControl.StopBits = lpDCB->StopBits;
  lineControl.Parity = lpDCB->Parity;
  lineControl.WordLength = lpDCB->ByteSize;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_SET_LINE_CONTROL, &lineControl,
                           sizeof(SERIAL_LINE_CONTROL), NULL, 0, &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "SetCommState failure: could not set the control settings.");
    return FALSE;
  }

  SERIAL_HANDFLOW handflow = { 0 };

  if (lpDCB->fOutxCtsFlow)
  {
    handflow.ControlHandShake |= SERIAL_CTS_HANDSHAKE;
  }

  if (lpDCB->fOutxDsrFlow)
  {
    handflow.ControlHandShake |= SERIAL_DSR_HANDSHAKE;
  }

  switch (lpDCB->fDtrControl)
  {
    case SERIAL_DTR_HANDSHAKE:
      handflow.ControlHandShake |= DTR_CONTROL_HANDSHAKE;
      break;

    case SERIAL_DTR_CONTROL:
      handflow.ControlHandShake |= DTR_CONTROL_ENABLE;
      break;

    case DTR_CONTROL_DISABLE:
      /* do nothing since handflow is init-zeroed */
      break;

    default:
      CommLog_Print(WLOG_WARN, "Unexpected fDtrControl value: %" PRIu32 "\n",
                    lpDCB->fDtrControl);
      return FALSE;
  }

  if (lpDCB->fDsrSensitivity)
  {
    handflow.ControlHandShake |= SERIAL_DSR_SENSITIVITY;
  }

  if (lpDCB->fTXContinueOnXoff)
  {
    handflow.FlowReplace |= SERIAL_XOFF_CONTINUE;
  }

  if (lpDCB->fOutX)
  {
    handflow.FlowReplace |= SERIAL_AUTO_TRANSMIT;
  }

  if (lpDCB->fInX)
  {
    handflow.FlowReplace |= SERIAL_AUTO_RECEIVE;
  }

  if (lpDCB->fErrorChar)
  {
    handflow.FlowReplace |= SERIAL_ERROR_CHAR;
  }

  if (lpDCB->fNull)
  {
    handflow.FlowReplace |= SERIAL_NULL_STRIPPING;
  }

  switch (lpDCB->fRtsControl)
  {
    case RTS_CONTROL_TOGGLE:
      CommLog_Print(WLOG_WARN, "Unsupported RTS_CONTROL_TOGGLE feature");
      // FIXME: see also GetCommState()
      return FALSE;

    case RTS_CONTROL_HANDSHAKE:
      handflow.FlowReplace |= SERIAL_RTS_HANDSHAKE;
      break;

    case RTS_CONTROL_ENABLE:
      handflow.FlowReplace |= SERIAL_RTS_CONTROL;
      break;

    case RTS_CONTROL_DISABLE:
      /* do nothing since handflow is init-zeroed */
      break;

    default:
      CommLog_Print(WLOG_WARN, "Unexpected fRtsControl value: %" PRIu32 "\n",
                    lpDCB->fRtsControl);
      return FALSE;
  }

  if (lpDCB->fAbortOnError)
  {
    handflow.ControlHandShake |= SERIAL_ERROR_ABORT;
  }

  /* lpDCB->fDummy2 not used */
  /* lpLocalDcb->wReserved  ignored */
  handflow.XonLimit = lpDCB->XonLim;
  handflow.XoffLimit = lpDCB->XoffLim;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_SET_HANDFLOW, &handflow, sizeof(SERIAL_HANDFLOW),
                           NULL, 0, &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "SetCommState failure: could not set the handflow settings.");
    return FALSE;
  }

  /** upcomingTermios stage **/

  if (tcgetattr(pComm->fd, &upcomingTermios) <
      0) /* NB: preserves current settings not directly handled by the Communication Functions */
  {
    SetLastError(ERROR_IO_DEVICE);
    return FALSE;
  }

  if (lpDCB->fBinary)
  {
    upcomingTermios.c_lflag &= ~ICANON;
  }
  else
  {
    upcomingTermios.c_lflag |= ICANON;
    CommLog_Print(WLOG_WARN, "Unexpected nonbinary mode, consider to unset the ICANON flag.");
  }

  if (lpDCB->fParity)
  {
    upcomingTermios.c_iflag |= INPCK;
  }
  else
  {
    upcomingTermios.c_iflag &= ~INPCK;
  }

  /* http://msdn.microsoft.com/en-us/library/windows/desktop/aa363423%28v=vs.85%29.aspx
   *
   * The SetCommState function reconfigures the communications
   * resource, but it does not affect the internal output and
   * input buffers of the specified driver. The buffers are not
   * flushed, and pending read and write operations are not
   * terminated prematurely.
   *
   * TCSANOW matches the best this definition
   */

  if (_comm_ioctl_tcsetattr(pComm->fd, TCSANOW, &upcomingTermios) < 0)
  {
    SetLastError(ERROR_IO_DEVICE);
    return FALSE;
  }

  return TRUE;
}

/**
 * ERRORS:
 *   ERROR_INVALID_HANDLE
 */
BOOL GetCommTimeouts(HANDLE hFile, LPCOMMTIMEOUTS lpCommTimeouts)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;
  DWORD bytesReturned = 0;

  if (!CommIsHandleValid(hFile))
    return FALSE;

  /* as of today, SERIAL_TIMEOUTS and COMMTIMEOUTS structures are identical */

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_GET_TIMEOUTS, NULL, 0, lpCommTimeouts,
                           sizeof(COMMTIMEOUTS), &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "GetCommTimeouts failure.");
    return FALSE;
  }

  return TRUE;
}

/**
 * ERRORS:
 *   ERROR_INVALID_HANDLE
 */
BOOL SetCommTimeouts(HANDLE hFile, LPCOMMTIMEOUTS lpCommTimeouts)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;
  DWORD bytesReturned = 0;

  if (!CommIsHandleValid(hFile))
    return FALSE;

  /* as of today, SERIAL_TIMEOUTS and COMMTIMEOUTS structures are identical */

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_SET_TIMEOUTS, lpCommTimeouts, sizeof(COMMTIMEOUTS),
                           NULL, 0, &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "SetCommTimeouts failure.");
    return FALSE;
  }

  return TRUE;
}

BOOL GetDefaultCommConfigA(LPCSTR lpszName, LPCOMMCONFIG lpCC, LPDWORD lpdwSize)
{
  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */
  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL GetDefaultCommConfigW(LPCWSTR lpszName, LPCOMMCONFIG lpCC, LPDWORD lpdwSize)
{
  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */
  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL SetDefaultCommConfigA(LPCSTR lpszName, LPCOMMCONFIG lpCC, DWORD dwSize)
{
  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */
  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL SetDefaultCommConfigW(LPCWSTR lpszName, LPCOMMCONFIG lpCC, DWORD dwSize)
{
  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */
  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL SetCommBreak(HANDLE hFile)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;

  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */

  if (!pComm)
    return FALSE;

  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL ClearCommBreak(HANDLE hFile)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;

  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */

  if (!pComm)
    return FALSE;

  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL ClearCommError(HANDLE hFile, PDWORD lpErrors, LPCOMSTAT lpStat)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;

  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */

  if (!pComm)
    return FALSE;

  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL PurgeComm(HANDLE hFile, DWORD dwFlags)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;
  DWORD bytesReturned = 0;

  if (!CommIsHandleValid(hFile))
    return FALSE;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_PURGE, &dwFlags, sizeof(DWORD), NULL, 0,
                           &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "PurgeComm failure.");
    return FALSE;
  }

  return TRUE;
}

BOOL SetupComm(HANDLE hFile, DWORD dwInQueue, DWORD dwOutQueue)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;
  SERIAL_QUEUE_SIZE queueSize;
  DWORD bytesReturned = 0;

  if (!CommIsHandleValid(hFile))
    return FALSE;

  queueSize.InSize = dwInQueue;
  queueSize.OutSize = dwOutQueue;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_SET_QUEUE_SIZE, &queueSize,
                           sizeof(SERIAL_QUEUE_SIZE), NULL, 0, &bytesReturned, NULL))
  {
    CommLog_Print(WLOG_WARN, "SetCommTimeouts failure.");
    return FALSE;
  }

  return TRUE;
}

BOOL EscapeCommFunction(HANDLE hFile, DWORD dwFunc)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;

  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */

  if (!pComm)
    return FALSE;

  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL TransmitCommChar(HANDLE hFile, char cChar)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;

  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */

  if (!pComm)
    return FALSE;

  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

BOOL WaitCommEvent(HANDLE hFile, PDWORD lpEvtMask, LPOVERLAPPED lpOverlapped)
{
  WINPR_COMM* pComm = (WINPR_COMM*)hFile;

  if (!CommInitialized())
    return FALSE;

  /* TODO: not implemented */

  if (!pComm)
    return FALSE;

  CommLog_Print(WLOG_ERROR, "Not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return FALSE;
}

/**
 * Returns TRUE on success, FALSE otherwise. To get extended error
 * information, call GetLastError.
 *
 * ERRORS:
 *   ERROR_DLL_INIT_FAILED
 *   ERROR_OUTOFMEMORY was not possible to get mappings.
 *   ERROR_INVALID_DATA was not possible to add the device.
 */
BOOL DefineCommDevice(/* DWORD dwFlags,*/ LPCTSTR lpDeviceName, LPCTSTR lpTargetPath)
{
  LPTSTR storedDeviceName = NULL;
  LPTSTR storedTargetPath = NULL;

  if (!CommInitialized())
    return FALSE;

  EnterCriticalSection(&sCommDevicesLock);

  if (sCommDevices == NULL)
  {
    SetLastError(ERROR_DLL_INIT_FAILED);
    goto error_handle;
  }

  storedDeviceName = _tcsdup(lpDeviceName);

  if (storedDeviceName == NULL)
  {
    SetLastError(ERROR_OUTOFMEMORY);
    goto error_handle;
  }

  storedTargetPath = _tcsdup(lpTargetPath);

  if (storedTargetPath == NULL)
  {
    SetLastError(ERROR_OUTOFMEMORY);
    goto error_handle;
  }

  int i = 0;
  for (; i < COMM_DEVICE_MAX; i++)
  {
    if (sCommDevices[i] != NULL)
    {
      if (_tcscmp(sCommDevices[i]->name, storedDeviceName) == 0)
      {
        /* take over the emplacement */
        free(sCommDevices[i]->name);
        free(sCommDevices[i]->path);
        sCommDevices[i]->name = storedDeviceName;
        sCommDevices[i]->path = storedTargetPath;
        break;
      }
    }
    else
    {
      /* new emplacement */
      sCommDevices[i] = (COMM_DEVICE*)calloc(1, sizeof(COMM_DEVICE));

      if (sCommDevices[i] == NULL)
      {
        SetLastError(ERROR_OUTOFMEMORY);
        goto error_handle;
      }

      sCommDevices[i]->name = storedDeviceName;
      sCommDevices[i]->path = storedTargetPath;
      break;
    }
  }

  if (i == COMM_DEVICE_MAX)
  {
    SetLastError(ERROR_OUTOFMEMORY);
    goto error_handle;
  }

  LeaveCriticalSection(&sCommDevicesLock);
  return TRUE;
error_handle:
  free(storedDeviceName);
  free(storedTargetPath);
  LeaveCriticalSection(&sCommDevicesLock);
  return FALSE;
}

/**
 * Returns the number of target paths in the buffer pointed to by
 * lpTargetPath.
 *
 * The current implementation returns in any case 0 and 1 target
 * path. A NULL lpDeviceName is not supported yet to get all the
 * paths.
 *
 * ERRORS:
 *   ERROR_SUCCESS
 *   ERROR_DLL_INIT_FAILED
 *   ERROR_OUTOFMEMORY was not possible to get mappings.
 *   ERROR_NOT_SUPPORTED equivalent QueryDosDevice feature not supported.
 *   ERROR_INVALID_DATA was not possible to retrieve any device information.
 *   ERROR_INSUFFICIENT_BUFFER too small lpTargetPath
 */
DWORD QueryCommDevice(LPCTSTR lpDeviceName, LPTSTR lpTargetPath, DWORD ucchMax)
{
  LPTSTR storedTargetPath = NULL;
  SetLastError(ERROR_SUCCESS);

  if (!CommInitialized())
    return 0;

  if (sCommDevices == NULL)
  {
    SetLastError(ERROR_DLL_INIT_FAILED);
    return 0;
  }

  if (lpDeviceName == NULL || lpTargetPath == NULL)
  {
    SetLastError(ERROR_NOT_SUPPORTED);
    return 0;
  }

  EnterCriticalSection(&sCommDevicesLock);
  storedTargetPath = NULL;

  for (int i = 0; i < COMM_DEVICE_MAX; i++)
  {
    if (sCommDevices[i] != NULL)
    {
      if (_tcscmp(sCommDevices[i]->name, lpDeviceName) == 0)
      {
        storedTargetPath = sCommDevices[i]->path;
        break;
      }

      continue;
    }

    break;
  }

  LeaveCriticalSection(&sCommDevicesLock);

  if (storedTargetPath == NULL)
  {
    SetLastError(ERROR_INVALID_DATA);
    return 0;
  }

  if (_tcslen(storedTargetPath) + 2 > ucchMax)
  {
    SetLastError(ERROR_INSUFFICIENT_BUFFER);
    return 0;
  }

  _tcscpy(lpTargetPath, storedTargetPath);
  lpTargetPath[_tcslen(storedTargetPath) + 1] = '\0'; /* 2nd final '\0' */
  return _tcslen(lpTargetPath) + 2;
}

/**
 * Checks whether lpDeviceName is a valid and registered Communication device.
 */
BOOL IsCommDevice(LPCTSTR lpDeviceName)
{
  TCHAR lpTargetPath[MAX_PATH];

  if (!CommInitialized())
    return FALSE;

  if (QueryCommDevice(lpDeviceName, lpTargetPath, MAX_PATH) > 0)
  {
    return TRUE;
  }

  return FALSE;
}

/**
 * Sets
 */
void _comm_setServerSerialDriver(HANDLE hComm, SERIAL_DRIVER_ID driverId)
{
  ULONG Type = 0;
  WINPR_HANDLE* Object = NULL;
  WINPR_COMM* pComm = NULL;

  if (!CommInitialized())
    return;

  if (!winpr_Handle_GetInfo(hComm, &Type, &Object))
  {
    CommLog_Print(WLOG_WARN, "_comm_setServerSerialDriver failure");
    return;
  }

  pComm = (WINPR_COMM*)Object;
  pComm->serverSerialDriverId = driverId;
}

static HANDLE_OPS ops = { CommIsHandled, CommCloseHandle,
                        CommGetFd,     NULL, /* CleanupHandle */
                        NULL,          NULL,
                        NULL,          NULL,
                        NULL,          NULL,
                        NULL,          NULL,
                        NULL,          NULL,
                        NULL,          NULL,
                        NULL,          NULL,
                        NULL,          NULL,
                        NULL };

/**
 * http://msdn.microsoft.com/en-us/library/windows/desktop/aa363198%28v=vs.85%29.aspx
 *
 * @param lpDeviceName e.g. COM1, ...
 *
 * @param dwDesiredAccess expects GENERIC_READ | GENERIC_WRITE, a
 * warning message is printed otherwise. TODO: better support.
 *
 * @param dwShareMode must be zero, INVALID_HANDLE_VALUE is returned
 * otherwise and GetLastError() should return ERROR_SHARING_VIOLATION.
 *
 * @param lpSecurityAttributes NULL expected, a warning message is printed
 * otherwise. TODO: better support.
 *
 * @param dwCreationDisposition must be OPEN_EXISTING. If the
 * communication device doesn't exist INVALID_HANDLE_VALUE is returned
 * and GetLastError() returns ERROR_FILE_NOT_FOUND.
 *
 * @param dwFlagsAndAttributes zero expected, a warning message is
 * printed otherwise.
 *
 * @param hTemplateFile must be NULL.
 *
 * @return INVALID_HANDLE_VALUE on error.
 */
HANDLE CommCreateFileA(LPCSTR lpDeviceName, DWORD dwDesiredAccess, DWORD dwShareMode,
                       LPSECURITY_ATTRIBUTES lpSecurityAttributes, DWORD dwCreationDisposition,
                       DWORD dwFlagsAndAttributes, HANDLE hTemplateFile)
{
  CHAR devicePath[MAX_PATH] = { 0 };
  struct stat deviceStat = { 0 };
  WINPR_COMM* pComm = NULL;
  struct termios upcomingTermios = { 0 };

  if (!CommInitialized())
    return INVALID_HANDLE_VALUE;

  if (dwDesiredAccess != (GENERIC_READ | GENERIC_WRITE))
  {
    CommLog_Print(WLOG_WARN, "unexpected access to the device: 0x%08" PRIX32 "",
                  dwDesiredAccess);
  }

  if (dwShareMode != 0)
  {
    SetLastError(ERROR_SHARING_VIOLATION);
    return INVALID_HANDLE_VALUE;
  }

  /* TODO: Prevents other processes from opening a file or
   * device if they request delete, read, or write access. */

  if (lpSecurityAttributes != NULL)
  {
    CommLog_Print(WLOG_WARN, "unexpected security attributes, nLength=%" PRIu32 "",
                  lpSecurityAttributes->nLength);
  }

  if (dwCreationDisposition != OPEN_EXISTING)
  {
    SetLastError(ERROR_FILE_NOT_FOUND); /* FIXME: ERROR_NOT_SUPPORTED better? */
    return INVALID_HANDLE_VALUE;
  }

  if (QueryCommDevice(lpDeviceName, devicePath, MAX_PATH) <= 0)
  {
    /* SetLastError(GetLastError()); */
    return INVALID_HANDLE_VALUE;
  }

  if (stat(devicePath, &deviceStat) < 0)
  {
    CommLog_Print(WLOG_WARN, "device not found %s", devicePath);
    SetLastError(ERROR_FILE_NOT_FOUND);
    return INVALID_HANDLE_VALUE;
  }

  if (!S_ISCHR(deviceStat.st_mode))
  {
    CommLog_Print(WLOG_WARN, "bad device %s", devicePath);
    SetLastError(ERROR_BAD_DEVICE);
    return INVALID_HANDLE_VALUE;
  }

  if (dwFlagsAndAttributes != 0)
  {
    CommLog_Print(WLOG_WARN, "unexpected flags and attributes: 0x%08" PRIX32 "",
                  dwFlagsAndAttributes);
  }

  if (hTemplateFile != NULL)
  {
    SetLastError(ERROR_NOT_SUPPORTED); /* FIXME: other proper error? */
    return INVALID_HANDLE_VALUE;
  }

  pComm = (WINPR_COMM*)calloc(1, sizeof(WINPR_COMM));

  if (pComm == NULL)
  {
    SetLastError(ERROR_OUTOFMEMORY);
    return INVALID_HANDLE_VALUE;
  }

  WINPR_HANDLE_SET_TYPE_AND_MODE(pComm, HANDLE_TYPE_COMM, WINPR_FD_READ);
  pComm->common.ops = &ops;
  /* error_handle */
  pComm->fd = open(devicePath, O_RDWR | O_NOCTTY | O_NONBLOCK);

  if (pComm->fd < 0)
  {
    CommLog_Print(WLOG_WARN, "failed to open device %s", devicePath);
    SetLastError(ERROR_BAD_DEVICE);
    goto error_handle;
  }

  pComm->fd_read = open(devicePath, O_RDONLY | O_NOCTTY | O_NONBLOCK);

  if (pComm->fd_read < 0)
  {
    CommLog_Print(WLOG_WARN, "failed to open fd_read, device: %s", devicePath);
    SetLastError(ERROR_BAD_DEVICE);
    goto error_handle;
  }

  pComm->fd_read_event = eventfd(
      0, EFD_NONBLOCK); /* EFD_NONBLOCK required because a read() is not always expected */

  if (pComm->fd_read_event < 0)
  {
    CommLog_Print(WLOG_WARN, "failed to open fd_read_event, device: %s", devicePath);
    SetLastError(ERROR_BAD_DEVICE);
    goto error_handle;
  }

  InitializeCriticalSection(&pComm->ReadLock);
  pComm->fd_write = open(devicePath, O_WRONLY | O_NOCTTY | O_NONBLOCK);

  if (pComm->fd_write < 0)
  {
    CommLog_Print(WLOG_WARN, "failed to open fd_write, device: %s", devicePath);
    SetLastError(ERROR_BAD_DEVICE);
    goto error_handle;
  }

  pComm->fd_write_event = eventfd(
      0, EFD_NONBLOCK); /* EFD_NONBLOCK required because a read() is not always expected */

  if (pComm->fd_write_event < 0)
  {
    CommLog_Print(WLOG_WARN, "failed to open fd_write_event, device: %s", devicePath);
    SetLastError(ERROR_BAD_DEVICE);
    goto error_handle;
  }

  InitializeCriticalSection(&pComm->WriteLock);
  /* can also be setup later on with _comm_setServerSerialDriver() */
  pComm->serverSerialDriverId = SerialDriverUnknown;
  InitializeCriticalSection(&pComm->EventsLock);

  if (ioctl(pComm->fd, TIOCGICOUNT, &(pComm->counters)) < 0)
  {
    char ebuffer[256] = { 0 };
    CommLog_Print(WLOG_WARN, "TIOCGICOUNT ioctl failed, errno=[%d] %s.", errno,
                  winpr_strerror(errno, ebuffer, sizeof(ebuffer)));
    CommLog_Print(WLOG_WARN, "could not read counters.");
    /* could not initialize counters but keep on.
     *
     * Not all drivers, especially for USB to serial
     * adapters (e.g. those based on pl2303), does support
     * this call.
     */
    ZeroMemory(&(pComm->counters), sizeof(struct serial_icounter_struct));
  }

  /* The binary/raw mode is required for the redirection but
   * only flags that are not handle somewhere-else, except
   * ICANON, are forced here. */
  ZeroMemory(&upcomingTermios, sizeof(struct termios));

  if (tcgetattr(pComm->fd, &upcomingTermios) < 0)
  {
    SetLastError(ERROR_IO_DEVICE);
    goto error_handle;
  }

  upcomingTermios.c_iflag &=
      ~(/*IGNBRK |*/ BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL /*| IXON*/);
  upcomingTermios.c_oflag = 0; /* <=> &= ~OPOST */
  upcomingTermios.c_lflag = 0; /* <=> &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN); */
  /* upcomingTermios.c_cflag &= ~(CSIZE | PARENB); */
  /* upcomingTermios.c_cflag |= CS8; */
  /* About missing flags recommended by termios(3):
   *
   *   IGNBRK and IXON, see: IOCTL_SERIAL_SET_HANDFLOW
   *   CSIZE, PARENB and CS8, see: IOCTL_SERIAL_SET_LINE_CONTROL
   */
  /* a few more settings required for the redirection */
  upcomingTermios.c_cflag |= CLOCAL | CREAD;

  if (_comm_ioctl_tcsetattr(pComm->fd, TCSANOW, &upcomingTermios) < 0)
  {
    SetLastError(ERROR_IO_DEVICE);
    goto error_handle;
  }

  return (HANDLE)pComm;
error_handle:
  WINPR_PRAGMA_DIAG_PUSH
  WINPR_PRAGMA_DIAG_IGNORED_MISMATCHED_DEALLOC
  CloseHandle(pComm);
  WINPR_PRAGMA_DIAG_POP
  return INVALID_HANDLE_VALUE;
}

BOOL CommIsHandled(HANDLE handle)
{
  if (!CommInitialized())
    return FALSE;

  return WINPR_HANDLE_IS_HANDLED(handle, HANDLE_TYPE_COMM, TRUE);
}

BOOL CommIsHandleValid(HANDLE handle)
{
  WINPR_COMM* pComm = (WINPR_COMM*)handle;
  if (!CommIsHandled(handle))
    return FALSE;
  if (pComm->fd <= 0)
  {
    SetLastError(ERROR_INVALID_HANDLE);
    return FALSE;
  }
  return TRUE;
}

BOOL CommCloseHandle(HANDLE handle)
{
  WINPR_COMM* pComm = (WINPR_COMM*)handle;

  if (!CommIsHandled(handle))
    return FALSE;

  DeleteCriticalSection(&pComm->ReadLock);
  DeleteCriticalSection(&pComm->WriteLock);
  DeleteCriticalSection(&pComm->EventsLock);

  if (pComm->fd > 0)
    close(pComm->fd);

  if (pComm->fd_write > 0)
    close(pComm->fd_write);

  if (pComm->fd_write_event > 0)
    close(pComm->fd_write_event);

  if (pComm->fd_read > 0)
    close(pComm->fd_read);

  if (pComm->fd_read_event > 0)
    close(pComm->fd_read_event);

  free(pComm);
  return TRUE;
}

#ifndef WITH_EVENTFD_READ_WRITE
int eventfd_read(int fd, eventfd_t* value)
{
  return (read(fd, value, sizeof(*value)) == sizeof(*value)) ? 0 : -1;
}

int eventfd_write(int fd, eventfd_t value)
{
  return (write(fd, &value, sizeof(value)) == sizeof(value)) ? 0 : -1;
}
#endif

Coverage Report

Created: 2024-09-08 06:18