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

Source
/**
 * 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>
#if defined(WINPR_HAVE_SYS_EVENTFD_H)
#include <sys/eventfd.h>
#endif
#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 "../handle/handle.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 = nullptr;

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 nullptr-terminated array with a maximum of COMM_DEVICE_MAX COMM_DEVICE */
#define COMM_DEVICE_MAX 128
static COMM_DEVICE** sCommDevices = nullptr;
static CRITICAL_SECTION sCommDevicesLock = WINPR_C_ARRAY_INIT;

static pthread_once_t sCommInitialized = PTHREAD_ONCE_INIT;

static const _SERIAL_IOCTL_NAME S_SERIAL_IOCTL_NAMES[] = {
  { IOCTL_SERIAL_SET_BAUD_RATE, "IOCTL_SERIAL_SET_BAUD_RATE" },
  { IOCTL_SERIAL_GET_BAUD_RATE, "IOCTL_SERIAL_GET_BAUD_RATE" },
  { IOCTL_SERIAL_SET_LINE_CONTROL, "IOCTL_SERIAL_SET_LINE_CONTROL" },
  { IOCTL_SERIAL_GET_LINE_CONTROL, "IOCTL_SERIAL_GET_LINE_CONTROL" },
  { IOCTL_SERIAL_SET_TIMEOUTS, "IOCTL_SERIAL_SET_TIMEOUTS" },
  { IOCTL_SERIAL_GET_TIMEOUTS, "IOCTL_SERIAL_GET_TIMEOUTS" },
  { IOCTL_SERIAL_GET_CHARS, "IOCTL_SERIAL_GET_CHARS" },
  { IOCTL_SERIAL_SET_CHARS, "IOCTL_SERIAL_SET_CHARS" },
  { IOCTL_SERIAL_SET_DTR, "IOCTL_SERIAL_SET_DTR" },
  { IOCTL_SERIAL_CLR_DTR, "IOCTL_SERIAL_CLR_DTR" },
  { IOCTL_SERIAL_RESET_DEVICE, "IOCTL_SERIAL_RESET_DEVICE" },
  { IOCTL_SERIAL_SET_RTS, "IOCTL_SERIAL_SET_RTS" },
  { IOCTL_SERIAL_CLR_RTS, "IOCTL_SERIAL_CLR_RTS" },
  { IOCTL_SERIAL_SET_XOFF, "IOCTL_SERIAL_SET_XOFF" },
  { IOCTL_SERIAL_SET_XON, "IOCTL_SERIAL_SET_XON" },
  { IOCTL_SERIAL_SET_BREAK_ON, "IOCTL_SERIAL_SET_BREAK_ON" },
  { IOCTL_SERIAL_SET_BREAK_OFF, "IOCTL_SERIAL_SET_BREAK_OFF" },
  { IOCTL_SERIAL_SET_QUEUE_SIZE, "IOCTL_SERIAL_SET_QUEUE_SIZE" },
  { IOCTL_SERIAL_GET_WAIT_MASK, "IOCTL_SERIAL_GET_WAIT_MASK" },
  { IOCTL_SERIAL_SET_WAIT_MASK, "IOCTL_SERIAL_SET_WAIT_MASK" },
  { IOCTL_SERIAL_WAIT_ON_MASK, "IOCTL_SERIAL_WAIT_ON_MASK" },
  { IOCTL_SERIAL_IMMEDIATE_CHAR, "IOCTL_SERIAL_IMMEDIATE_CHAR" },
  { IOCTL_SERIAL_PURGE, "IOCTL_SERIAL_PURGE" },
  { IOCTL_SERIAL_GET_HANDFLOW, "IOCTL_SERIAL_GET_HANDFLOW" },
  { IOCTL_SERIAL_SET_HANDFLOW, "IOCTL_SERIAL_SET_HANDFLOW" },
  { IOCTL_SERIAL_GET_MODEMSTATUS, "IOCTL_SERIAL_GET_MODEMSTATUS" },
  { IOCTL_SERIAL_GET_DTRRTS, "IOCTL_SERIAL_GET_DTRRTS" },
  { IOCTL_SERIAL_GET_COMMSTATUS, "IOCTL_SERIAL_GET_COMMSTATUS" },
  { IOCTL_SERIAL_GET_PROPERTIES, "IOCTL_SERIAL_GET_PROPERTIES" },
  // {IOCTL_SERIAL_XOFF_COUNTER,  "IOCTL_SERIAL_XOFF_COUNTER"},
  // {IOCTL_SERIAL_LSRMST_INSERT, "IOCTL_SERIAL_LSRMST_INSERT"},
  { IOCTL_SERIAL_CONFIG_SIZE, "IOCTL_SERIAL_CONFIG_SIZE" },
  // {IOCTL_SERIAL_GET_STATS, "IOCTL_SERIAL_GET_STATS"},
  // {IOCTL_SERIAL_CLEAR_STATS, "IOCTL_SERIAL_CLEAR_STATS"},
  // {IOCTL_SERIAL_GET_MODEM_CONTROL,"IOCTL_SERIAL_GET_MODEM_CONTROL"},
  // {IOCTL_SERIAL_SET_MODEM_CONTROL,"IOCTL_SERIAL_SET_MODEM_CONTROL"},
  // {IOCTL_SERIAL_SET_FIFO_CONTROL,  "IOCTL_SERIAL_SET_FIFO_CONTROL"},

  // {IOCTL_PAR_QUERY_INFORMATION,  "IOCTL_PAR_QUERY_INFORMATION"},
  // {IOCTL_PAR_SET_INFORMATION,  "IOCTL_PAR_SET_INFORMATION"},
  // {IOCTL_PAR_QUERY_DEVICE_ID,  "IOCTL_PAR_QUERY_DEVICE_ID"},
  // {IOCTL_PAR_QUERY_DEVICE_ID_SIZE,"IOCTL_PAR_QUERY_DEVICE_ID_SIZE"},
  // {IOCTL_IEEE1284_GET_MODE,  "IOCTL_IEEE1284_GET_MODE"},
  // {IOCTL_IEEE1284_NEGOTIATE, "IOCTL_IEEE1284_NEGOTIATE"},
  // {IOCTL_PAR_SET_WRITE_ADDRESS,  "IOCTL_PAR_SET_WRITE_ADDRESS"},
  // {IOCTL_PAR_SET_READ_ADDRESS, "IOCTL_PAR_SET_READ_ADDRESS"},
  // {IOCTL_PAR_GET_DEVICE_CAPS,  "IOCTL_PAR_GET_DEVICE_CAPS"},
  // {IOCTL_PAR_GET_DEFAULT_MODES,  "IOCTL_PAR_GET_DEFAULT_MODES"},
  // {IOCTL_PAR_QUERY_RAW_DEVICE_ID, "IOCTL_PAR_QUERY_RAW_DEVICE_ID"},
  // {IOCTL_PAR_IS_PORT_FREE, "IOCTL_PAR_IS_PORT_FREE"},

  { IOCTL_USBPRINT_GET_1284_ID, "IOCTL_USBPRINT_GET_1284_ID" }
};

const char* _comm_serial_ioctl_name(ULONG number)
{
  for (size_t x = 0; x < ARRAYSIZE(S_SERIAL_IOCTL_NAMES); x++)
  {
    const _SERIAL_IOCTL_NAME* cur = &S_SERIAL_IOCTL_NAMES[x];
    if (cur->number == number)
      return cur->name;
  }

  return "(unknown ioctl name)";
}

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

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

  return comm->fd;
}

const HANDLE_CREATOR* GetCommHandleCreator(void)
{
#if defined(WINPR_HAVE_SERIAL_SUPPORT)
  static const HANDLE_CREATOR sCommHandleCreator = { .IsHandled = IsCommDevice,
                                                   .CreateFileA = CommCreateFileA };
  return &sCommHandleCreator;
#else
  return nullptr;
#endif
}

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

  if (!sCommDevices)
    return;

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

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

/**
 * Returns TRUE when the comm module is correctly initialized, 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;
}

WINPR_ATTR_FORMAT_ARG(5, 6)
void CommLog_PrintEx(DWORD level, const char* file, size_t line, const char* fkt,
                     WINPR_FORMAT_ARG const char* fmt, ...)
{
  if (!CommInitialized())
    return;

  if (!WLog_IsLevelActive(sLog, level))
    return;
  va_list ap = WINPR_C_ARRAY_INIT;
  va_start(ap, fmt);
  WLog_PrintTextMessageVA(sLog, level, line, file, fkt, fmt, ap);
  va_end(ap);
}

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

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

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

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

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

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

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

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

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

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

BOOL CommConfigDialogW(WINPR_ATTR_UNUSED LPCWSTR lpszName, WINPR_ATTR_UNUSED HWND hWnd,
                       WINPR_ATTR_UNUSED 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, WINPR_ATTR_UNUSED LPCOMMCONFIG lpCC,
                   WINPR_ATTR_UNUSED 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, WINPR_ATTR_UNUSED LPCOMMCONFIG lpCC,
                   WINPR_ATTR_UNUSED 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, WINPR_ATTR_UNUSED 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, WINPR_ATTR_UNUSED 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, WINPR_ATTR_UNUSED 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, nullptr, 0, lpCommProp,
                           sizeof(COMMPROP), &bytesReturned, nullptr))
  {
    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 = nullptr;
  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 == nullptr)
  {
    SetLastError(ERROR_OUTOFMEMORY);
    return FALSE;
  }

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

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_GET_BAUD_RATE, nullptr, 0, &baudRate,
                           sizeof(SERIAL_BAUD_RATE), &bytesReturned, nullptr))
  {
    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, nullptr, 0, &handflow,
                           sizeof(SERIAL_HANDFLOW), &bytesReturned, nullptr))
  {
    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 = WINPR_ASSERTING_INT_CAST(WORD, handflow.XonLimit);
  lpLocalDcb->XoffLim = WINPR_ASSERTING_INT_CAST(WORD, handflow.XoffLimit);

  {
    SERIAL_LINE_CONTROL lineControl = WINPR_C_ARRAY_INIT;

    if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_GET_LINE_CONTROL, nullptr, 0, &lineControl,
                             sizeof(SERIAL_LINE_CONTROL), &bytesReturned, nullptr))
    {
      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 = WINPR_C_ARRAY_INIT;

    if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_GET_CHARS, nullptr, 0, &serialChars,
                             sizeof(SERIAL_CHARS), &bytesReturned, nullptr))
    {
      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 = WINPR_C_ARRAY_INIT;
  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 = WINPR_C_ARRAY_INIT;
  baudRate.BaudRate = lpDCB->BaudRate;

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

  SERIAL_CHARS serialChars;

  if (!CommDeviceIoControl(pComm, IOCTL_SERIAL_GET_CHARS, nullptr, 0, &serialChars,
                           sizeof(SERIAL_CHARS), &bytesReturned,
                           nullptr)) /* 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),
                           nullptr, 0, &bytesReturned, nullptr))
  {
    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), nullptr, 0, &bytesReturned, nullptr))
  {
    CommLog_Print(WLOG_WARN, "SetCommState failure: could not set the control settings.");
    return FALSE;
  }

  SERIAL_HANDFLOW handflow = WINPR_C_ARRAY_INIT;

  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: %" PRId32 "\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: %" PRId32 "\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),
                           nullptr, 0, &bytesReturned, nullptr))
  {
    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 &= (tcflag_t)~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 &= (tcflag_t)~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, nullptr, 0, lpCommTimeouts,
                           sizeof(COMMTIMEOUTS), &bytesReturned, nullptr))
  {
    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),
                           nullptr, 0, &bytesReturned, nullptr))
  {
    CommLog_Print(WLOG_WARN, "SetCommTimeouts failure.");
    return FALSE;
  }

  return TRUE;
}

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

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

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

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

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

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

BOOL SetDefaultCommConfigW(WINPR_ATTR_UNUSED LPCWSTR lpszName, WINPR_ATTR_UNUSED LPCOMMCONFIG lpCC,
                           WINPR_ATTR_UNUSED 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, WINPR_ATTR_UNUSED PDWORD lpErrors,
                    WINPR_ATTR_UNUSED 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), nullptr, 0,
                           &bytesReturned, nullptr))
  {
    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), nullptr, 0, &bytesReturned, nullptr))
  {
    CommLog_Print(WLOG_WARN, "SetCommTimeouts failure.");
    return FALSE;
  }

  return TRUE;
}

BOOL EscapeCommFunction(HANDLE hFile, WINPR_ATTR_UNUSED 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, WINPR_ATTR_UNUSED 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, WINPR_ATTR_UNUSED PDWORD lpEvtMask,
                   WINPR_ATTR_UNUSED 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 = nullptr;
  LPTSTR storedTargetPath = nullptr;

  if (!CommInitialized())
    return FALSE;

  EnterCriticalSection(&sCommDevicesLock);

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

  storedDeviceName = _tcsdup(lpDeviceName);

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

  storedTargetPath = _tcsdup(lpTargetPath);

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

  {
    int i = 0;
    for (; i < COMM_DEVICE_MAX; i++)
    {
      if (sCommDevices[i] != nullptr)
      {
        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] == nullptr)
        {
          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 nullptr 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 = nullptr;
  SetLastError(ERROR_SUCCESS);

  if (!CommInitialized())
    return 0;

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

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

  EnterCriticalSection(&sCommDevicesLock);
  storedTargetPath = nullptr;

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

      continue;
    }

    break;
  }

  LeaveCriticalSection(&sCommDevicesLock);

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

  const size_t size = _tcsnlen(storedTargetPath, ucchMax);
  if (size + 2 > ucchMax)
  {
    SetLastError(ERROR_INSUFFICIENT_BUFFER);
    return 0;
  }

  _tcsncpy(lpTargetPath, storedTargetPath, size + 1);
  lpTargetPath[size + 2] = '\0'; /* 2nd final '\0' */
  return (DWORD)size + 2UL;
}

/**
 * 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 = nullptr;
  WINPR_COMM* pComm = nullptr;

  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, nullptr, /* CleanupHandle */
                        nullptr,       nullptr,         nullptr,   nullptr, nullptr, nullptr,
                        nullptr,       nullptr,         nullptr,   nullptr, nullptr, nullptr,
                        nullptr,       nullptr,         nullptr,   nullptr, nullptr };

#if defined(WINPR_HAVE_SYS_EVENTFD_H)
/* eventfd() with EFD_NONBLOCK|EFD_CLOEXEC, falling back to the flag-less call plus separate
 * fcntl()s on kernels older than 2.6.27 (which reject unknown flags with EINVAL) */
WINPR_ATTR_NODISCARD
static int comm_eventfd_cloexec(void)
{
  int fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
  if ((fd < 0) && (errno == EINVAL))
  {
    /* old kernels reject any nonzero flags argument outright, so both flags have to be
     * applied separately afterward - O_NONBLOCK (F_SETFL) and FD_CLOEXEC (F_SETFD) live in
     * different fcntl() namespaces and can't be folded into one call. No need to read the
     * previous flags first: this fd is brand new, so both start unset. */
    fd = eventfd(0, 0);
    if ((fd >= 0) &&
        ((fcntl(fd, F_SETFL, O_NONBLOCK) < 0) || (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)))
    {
      close(fd);
      fd = -1;
    }
  }
  return fd;
}
#endif

/**
 * 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 nullptr 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 nullptr.
 *
 * @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] = WINPR_C_ARRAY_INIT;
  struct stat deviceStat = WINPR_C_ARRAY_INIT;
  WINPR_COMM* pComm = nullptr;
  struct termios upcomingTermios = WINPR_C_ARRAY_INIT;

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

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

  if (pComm == nullptr)
  {
    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 | O_CLOEXEC);

  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 | O_CLOEXEC);

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

#if defined(WINPR_HAVE_SYS_EVENTFD_H)
  pComm->fd_read_event = comm_eventfd_cloexec();
#endif

  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 | O_CLOEXEC);

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

#if defined(WINPR_HAVE_SYS_EVENTFD_H)
  pComm->fd_write_event = comm_eventfd_cloexec();
#endif

  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);

  (void)CommUpdateIOCount(pComm, TRUE);

  /* 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 &=
      (tcflag_t) ~(/*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(void) 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);

  return TRUE;
}

#if defined(WINPR_HAVE_SYS_EVENTFD_H)
#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
#endif

static const char* CommIoCtlToStr(unsigned long int io)
{
  switch (io)
  {
#if defined(WINPR_HAVE_SERIAL_SUPPORT)
#if defined(TCGETS)
    case TCGETS:
      return "TCGETS";
#endif
#if defined(TCSETS)
    case TCSETS:
      return "TCSETS";
#endif
#if defined(TCSETSW)
    case TCSETSW:
      return "TCSETSW";
#endif
#if defined(TCSETSF)
    case TCSETSF:
      return "TCSETSF";
#endif
#if defined(TCGETA)
    case TCGETA:
      return "TCGETA";
#endif
#if defined(TCSETA)
    case TCSETA:
      return "TCSETA";
#endif
#if defined(TCSETAW)
    case TCSETAW:
      return "TCSETAW";
#endif
#if defined(TCSETAF)
    case TCSETAF:
      return "TCSETAF";
#endif
#if defined(TCSBRK)
    case TCSBRK:
      return "TCSBRK";
#endif
#if defined(TCXONC)
    case TCXONC:
      return "TCXONC";
#endif
#if defined(TCFLSH)
    case TCFLSH:
      return "TCFLSH";
#endif
#if defined(TIOCEXCL)
    case TIOCEXCL:
      return "TIOCEXCL";
#endif
#if defined(TIOCNXCL)
    case TIOCNXCL:
      return "TIOCNXCL";
#endif
#if defined(TIOCSCTTY)
    case TIOCSCTTY:
      return "TIOCSCTTY";
#endif
#if defined(TIOCGPGRP)
    case TIOCGPGRP:
      return "TIOCGPGRP";
#endif
#if defined(TIOCSPGRP)
    case TIOCSPGRP:
      return "TIOCSPGRP";
#endif
#if defined(TIOCOUTQ)
    case TIOCOUTQ:
      return "TIOCOUTQ";
#endif
#if defined(TIOCSTI)
    case TIOCSTI:
      return "TIOCSTI";
#endif
#if defined(TIOCGWINSZ)
    case TIOCGWINSZ:
      return "TIOCGWINSZ";
#endif
#if defined(TIOCSWINSZ)
    case TIOCSWINSZ:
      return "TIOCSWINSZ";
#endif
#if defined(TIOCMGET)
    case TIOCMGET:
      return "TIOCMGET";
#endif
#if defined(TIOCMBIS)
    case TIOCMBIS:
      return "TIOCMBIS";
#endif
#if defined(TIOCMBIC)
    case TIOCMBIC:
      return "TIOCMBIC";
#endif
#if defined(TIOCMSET)
    case TIOCMSET:
      return "TIOCMSET";
#endif
#if defined(TIOCGSOFTCAR)
    case TIOCGSOFTCAR:
      return "TIOCGSOFTCAR";
#endif
#if defined(TIOCSSOFTCAR)
    case TIOCSSOFTCAR:
      return "TIOCSSOFTCAR";
#endif
#if defined(FIONREAD)
    case FIONREAD:
      return "FIONREAD/TIOCINQ";
#endif
#if defined(TIOCLINUX)
    case TIOCLINUX:
      return "TIOCLINUX";
#endif
#if defined(TIOCCONS)
    case TIOCCONS:
      return "TIOCCONS";
#endif
#if defined(TIOCGSERIAL)
    case TIOCGSERIAL:
      return "TIOCGSERIAL";
#endif
#if defined(TIOCSSERIAL)
    case TIOCSSERIAL:
      return "TIOCSSERIAL";
#endif
#if defined(TIOCPKT)
    case TIOCPKT:
      return "TIOCPKT";
#endif
#if defined(FIONBIO)
    case FIONBIO:
      return "FIONBIO";
#endif
#if defined(TIOCNOTTY)
    case TIOCNOTTY:
      return "TIOCNOTTY";
#endif
#if defined(TIOCSETD)
    case TIOCSETD:
      return "TIOCSETD";
#endif
#if defined(TIOCGETD)
    case TIOCGETD:
      return "TIOCGETD";
#endif
#if defined(TCSBRKP)
    case TCSBRKP:
      return "TCSBRKP";
#endif
#if defined(TIOCSBRK)
    case TIOCSBRK:
      return "TIOCSBRK";
#endif
#if defined(TIOCCBRK)
    case TIOCCBRK:
      return "TIOCCBRK";
#endif
#if defined(TIOCGSID)
    case TIOCGSID:
      return "TIOCGSID";
#endif
#if defined(TIOCGRS485)
    case TIOCGRS485:
      return "TIOCGRS485";
#endif
#if defined(TIOCSRS485)
    case TIOCSRS485:
      return "TIOCSRS485";
#endif
#if defined(TIOCSPTLCK)
    case TIOCSPTLCK:
      return "TIOCSPTLCK";
#endif
#if defined(TCGETX)
    case TCGETX:
      return "TCGETX";
#endif
#if defined(TCSETX)
    case TCSETX:
      return "TCSETX";
#endif
#if defined(TCSETXF)
    case TCSETXF:
      return "TCSETXF";
#endif
#if defined(TCSETXW)
    case TCSETXW:
      return "TCSETXW";
#endif
#if defined(TIOCSIG)
    case TIOCSIG:
      return "TIOCSIG";
#endif
#if defined(TIOCVHANGUP)
    case TIOCVHANGUP:
      return "TIOCVHANGUP";
#endif
#if defined(TIOCGPTPEER)
    case TIOCGPTPEER:
      return "TIOCGPTPEER";
#endif
#if defined(FIONCLEX)
    case FIONCLEX:
      return "FIONCLEX";
#endif
#if defined(FIOCLEX)
    case FIOCLEX:
      return "FIOCLEX";
#endif
#if defined(FIOASYNC)
    case FIOASYNC:
      return "FIOASYNC";
#endif
#if defined(TIOCSERCONFIG)
    case TIOCSERCONFIG:
      return "TIOCSERCONFIG";
#endif
#if defined(TIOCSERGWILD)
    case TIOCSERGWILD:
      return "TIOCSERGWILD";
#endif
#if defined(TIOCSERSWILD)
    case TIOCSERSWILD:
      return "TIOCSERSWILD";
#endif
#if defined(TIOCGLCKTRMIOS)
    case TIOCGLCKTRMIOS:
      return "TIOCGLCKTRMIOS";
#endif
#if defined(TIOCSLCKTRMIOS)
    case TIOCSLCKTRMIOS:
      return "TIOCSLCKTRMIOS";
#endif
#if defined(TIOCSERGSTRUCT)
    case TIOCSERGSTRUCT:
      return "TIOCSERGSTRUCT";
#endif
#if defined(TIOCSERGETLSR)
    case TIOCSERGETLSR:
      return "TIOCSERGETLSR";
#endif
#if defined(TIOCSERGETMULTI)
    case TIOCSERGETMULTI:
      return "TIOCSERGETMULTI";
#endif
#if defined(TIOCSERSETMULTI)
    case TIOCSERSETMULTI:
      return "TIOCSERSETMULTI";
#endif
#if defined(TIOCMIWAIT)
    case TIOCMIWAIT:
      return "TIOCMIWAIT";
#endif
#if defined(TIOCGICOUNT)
    case TIOCGICOUNT:
      return "TIOCGICOUNT";
#endif
#if defined(FIOQSIZE)
    case FIOQSIZE:
      return "FIOQSIZE";
#endif
#if defined(TIOCPKT_DATA)
    case TIOCPKT_DATA:
      return "TIOCPKT_DATA";
#endif
#if defined(TIOCPKT_FLUSHWRITE)
    case TIOCPKT_FLUSHWRITE:
      return "TIOCPKT_FLUSHWRITE";
#endif
#if defined(TIOCPKT_STOP)
    case TIOCPKT_STOP:
      return "TIOCPKT_STOP";
#endif
#if defined(TIOCPKT_START)
    case TIOCPKT_START:
      return "TIOCPKT_START";
#endif
#if defined(TIOCPKT_NOSTOP)
    case TIOCPKT_NOSTOP:
      return "TIOCPKT_NOSTOP";
#endif
#if defined(TIOCPKT_DOSTOP)
    case TIOCPKT_DOSTOP:
      return "TIOCPKT_DOSTOP";
#endif
#if defined(TIOCPKT_IOCTL)
    case TIOCPKT_IOCTL:
      return "TIOCPKT_IOCTL";
#endif
#endif
    default:
      return "UNKNOWN";
  }
}

static BOOL CommStatusErrorEx(WINPR_COMM* pComm, unsigned long int ctl, const char* file,
                              const char* fkt, size_t line)
{
  WINPR_ASSERT(pComm);
  BOOL rc = (pComm->permissive);
  const DWORD level = rc ? WLOG_DEBUG : WLOG_WARN;
  char ebuffer[256] = WINPR_C_ARRAY_INIT;
  const char* str = CommIoCtlToStr(ctl);

  if (CommInitialized())
  {
    if (WLog_IsLevelActive(sLog, level))
    {
      WLog_PrintTextMessage(sLog, level, line, file, fkt,
                            "%s [0x%08lx] ioctl failed, errno=[%d] %s.", str, ctl, errno,
                            winpr_strerror(errno, ebuffer, sizeof(ebuffer)));
    }
  }

  if (!rc)
    SetLastError(ERROR_IO_DEVICE);

  return rc;
}

BOOL CommIoCtl_int(WINPR_COMM* pComm, unsigned long int ctl, void* data, const char* file,
                   const char* fkt, size_t line)
{
  if (ioctl(pComm->fd, ctl, data) < 0)
  {
    if (!CommStatusErrorEx(pComm, ctl, file, fkt, line))
      return FALSE;
  }
  return TRUE;
}

BOOL CommUpdateIOCount(WINPR_ATTR_UNUSED HANDLE handle, WINPR_ATTR_UNUSED BOOL checkSupportStatus)
{
  WINPR_COMM* pComm = (WINPR_COMM*)handle;
  WINPR_ASSERT(pComm);

#if defined(WINPR_HAVE_COMM_COUNTERS)
  ZeroMemory(&(pComm->counters), sizeof(struct serial_icounter_struct));
  if (pComm->TIOCGICOUNTSupported || checkSupportStatus)
  {
    const int rc = ioctl(pComm->fd, TIOCGICOUNT, &(pComm->counters));
    if (checkSupportStatus)
      pComm->TIOCGICOUNTSupported = rc >= 0;
    else if (rc < 0)
    {
      if (!CommStatusErrorEx(pComm, TIOCGICOUNT, __FILE__, __func__, __LINE__))
        return FALSE;
    }
  }
#endif
  return TRUE;
}

static const char* CommSerialEvFlagString(ULONG flag)
{
  switch (flag)
  {
    case SERIAL_EV_RXCHAR:
      return "SERIAL_EV_RXCHAR";
    case SERIAL_EV_RXFLAG:
      return "SERIAL_EV_RXFLAG";
    case SERIAL_EV_TXEMPTY:
      return "SERIAL_EV_TXEMPTY";
    case SERIAL_EV_CTS:
      return "SERIAL_EV_CTS ";
    case SERIAL_EV_DSR:
      return "SERIAL_EV_DSR ";
    case SERIAL_EV_RLSD:
      return "SERIAL_EV_RLSD";
    case SERIAL_EV_BREAK:
      return "SERIAL_EV_BREAK";
    case SERIAL_EV_ERR:
      return "SERIAL_EV_ERR ";
    case SERIAL_EV_RING:
      return "SERIAL_EV_RING";
    case SERIAL_EV_PERR:
      return "SERIAL_EV_PERR";
    case SERIAL_EV_RX80FULL:
      return "SERIAL_EV_RX80FULL";
    case SERIAL_EV_EVENT1:
      return "SERIAL_EV_EVENT1";
    case SERIAL_EV_EVENT2:
      return "SERIAL_EV_EVENT2";
    case SERIAL_EV_WINPR_WAITING:
      return "SERIAL_EV_WINPR_WAITING";
    case SERIAL_EV_WINPR_STOP:
      return "SERIAL_EV_WINPR_STOP";
    default:
      return "SERIAL_EV_UNKNOWN";
  }
}

const char* CommSerialEvString(ULONG status, char* buffer, size_t size)
{
  const ULONG flags[] = { SERIAL_EV_RXCHAR, SERIAL_EV_RXFLAG,        SERIAL_EV_TXEMPTY,
                        SERIAL_EV_CTS,    SERIAL_EV_DSR,           SERIAL_EV_RLSD,
                        SERIAL_EV_BREAK,  SERIAL_EV_ERR,           SERIAL_EV_RING,
                        SERIAL_EV_PERR,   SERIAL_EV_RX80FULL,      SERIAL_EV_EVENT1,
                        SERIAL_EV_EVENT2, SERIAL_EV_WINPR_WAITING, SERIAL_EV_WINPR_STOP };

  winpr_str_append("{", buffer, size, "");

  const char* sep = "";
  for (size_t x = 0; x < ARRAYSIZE(flags); x++)
  {
    const ULONG flag = flags[x];
    if (status & flag)
    {
      winpr_str_append(CommSerialEvFlagString(flag), buffer, size, sep);
      sep = "|";
    }
  }

  char number[32] = WINPR_C_ARRAY_INIT;
  (void)_snprintf(number, sizeof(number), "}[0x%08" PRIx32 "]", status);
  winpr_str_append(number, buffer, size, "");
  return buffer;
}

Coverage Report

Created: 2026-08-31 06:25