channels/client/addin.c

 
#include <freerdp/config.h>
 
#include <winpr/crt.h>
#include <winpr/assert.h>
#include <winpr/path.h>
#include <winpr/string.h>
#include <winpr/file.h>
#include <winpr/synch.h>
#include <winpr/library.h>
#include <winpr/collections.h>
 
#include <freerdp/freerdp.h>
#include <freerdp/addin.h>
#include <freerdp/build-config.h>
#include <freerdp/client/channels.h>
 
#include "tables.h"
 
#include "addin.h"
 
#include <freerdp/channels/log.h>
#define TAG CHANNELS_TAG("addin")
 
extern const STATIC_ENTRY_TABLE CLIENT_STATIC_ENTRY_TABLES[];
 
static void* freerdp_channels_find_static_entry_in_table(const STATIC_ENTRY_TABLE* table,
                                                         const char* identifier)
{
  size_t index = 0;
  const STATIC_ENTRY* pEntry = &table->table.cse[index++];
 
  while (pEntry->entry != NULL)
  {
    static_entry_fn_t fkt = pEntry->entry;
    if (strcmp(pEntry->name, identifier) == 0)
      return WINPR_FUNC_PTR_CAST(fkt, void*);
 
    pEntry = &table->table.cse[index++];
  }
 
  return NULL;
}
 
void* freerdp_channels_client_find_static_entry(const char* name, const char* identifier)
{
  size_t index = 0;
  const STATIC_ENTRY_TABLE* pEntry = &CLIENT_STATIC_ENTRY_TABLES[index++];
 
  while (pEntry->table.cse != NULL)
  {
    if (strcmp(pEntry->name, name) == 0)
    {
      return freerdp_channels_find_static_entry_in_table(pEntry, identifier);
    }
 
    pEntry = &CLIENT_STATIC_ENTRY_TABLES[index++];
  }
 
  return NULL;
}
 
extern const STATIC_ADDIN_TABLE CLIENT_STATIC_ADDIN_TABLE[];
 
static FREERDP_ADDIN** freerdp_channels_list_client_static_addins(LPCSTR pszName,
                                                                  LPCSTR pszSubsystem,
                                                                  LPCSTR pszType, DWORD dwFlags)
{
  DWORD nAddins = 0;
  FREERDP_ADDIN** ppAddins = NULL;
  const STATIC_SUBSYSTEM_ENTRY* subsystems = NULL;
  nAddins = 0;
  ppAddins = (FREERDP_ADDIN**)calloc(128, sizeof(FREERDP_ADDIN*));
 
  if (!ppAddins)
  {
    WLog_ERR(TAG, "calloc failed!");
    return NULL;
  }
 
  ppAddins[nAddins] = NULL;
 
  for (size_t i = 0; CLIENT_STATIC_ADDIN_TABLE[i].name != NULL; i++)
  {
    FREERDP_ADDIN* pAddin = (FREERDP_ADDIN*)calloc(1, sizeof(FREERDP_ADDIN));
    const STATIC_ADDIN_TABLE* table = &CLIENT_STATIC_ADDIN_TABLE[i];
    if (!pAddin)
    {
      WLog_ERR(TAG, "calloc failed!");
      goto error_out;
    }
 
    (void)sprintf_s(pAddin->cName, ARRAYSIZE(pAddin->cName), "%s", table->name);
    pAddin->dwFlags = FREERDP_ADDIN_CLIENT;
    pAddin->dwFlags |= FREERDP_ADDIN_STATIC;
    pAddin->dwFlags |= FREERDP_ADDIN_NAME;
    ppAddins[nAddins++] = pAddin;
    subsystems = table->table;
 
    for (size_t j = 0; subsystems[j].name != NULL; j++)
    {
      pAddin = (FREERDP_ADDIN*)calloc(1, sizeof(FREERDP_ADDIN));
 
      if (!pAddin)
      {
        WLog_ERR(TAG, "calloc failed!");
        goto error_out;
      }
 
      (void)sprintf_s(pAddin->cName, ARRAYSIZE(pAddin->cName), "%s", table->name);
      (void)sprintf_s(pAddin->cSubsystem, ARRAYSIZE(pAddin->cSubsystem), "%s",
                      subsystems[j].name);
      pAddin->dwFlags = FREERDP_ADDIN_CLIENT;
      pAddin->dwFlags |= FREERDP_ADDIN_STATIC;
      pAddin->dwFlags |= FREERDP_ADDIN_NAME;
      pAddin->dwFlags |= FREERDP_ADDIN_SUBSYSTEM;
      ppAddins[nAddins++] = pAddin;
    }
  }
 
  return ppAddins;
error_out:
  freerdp_channels_addin_list_free(ppAddins);
  return NULL;
}
 
static HANDLE FindFirstFileUTF8(LPCSTR pszSearchPath, WIN32_FIND_DATAW* FindData)
{
  HANDLE hdl = INVALID_HANDLE_VALUE;
  if (!pszSearchPath)
    return hdl;
  WCHAR* wpath = ConvertUtf8ToWCharAlloc(pszSearchPath, NULL);
  if (!wpath)
    return hdl;
 
  hdl = FindFirstFileW(wpath, FindData);
  free(wpath);
 
  return hdl;
}
 
static FREERDP_ADDIN** freerdp_channels_list_dynamic_addins(LPCSTR pszName, LPCSTR pszSubsystem,
                                                            LPCSTR pszType, DWORD dwFlags)
{
  int nDashes = 0;
  HANDLE hFind = NULL;
  DWORD nAddins = 0;
  LPSTR pszPattern = NULL;
  size_t cchPattern = 0;
  LPCSTR pszAddinPath = FREERDP_ADDIN_PATH;
  LPCSTR pszInstallPrefix = FREERDP_INSTALL_PREFIX;
  LPCSTR pszExtension = NULL;
  LPSTR pszSearchPath = NULL;
  size_t cchSearchPath = 0;
  size_t cchAddinPath = 0;
  size_t cchInstallPrefix = 0;
  FREERDP_ADDIN** ppAddins = NULL;
  WIN32_FIND_DATAW FindData = { 0 };
  cchAddinPath = strnlen(pszAddinPath, sizeof(FREERDP_ADDIN_PATH));
  cchInstallPrefix = strnlen(pszInstallPrefix, sizeof(FREERDP_INSTALL_PREFIX));
  pszExtension = PathGetSharedLibraryExtensionA(0);
  cchPattern = 128 + strnlen(pszExtension, MAX_PATH) + 2;
  pszPattern = (LPSTR)malloc(cchPattern + 1);
 
  if (!pszPattern)
  {
    WLog_ERR(TAG, "malloc failed!");
    return NULL;
  }
 
  if (pszName && pszSubsystem && pszType)
  {
    (void)sprintf_s(pszPattern, cchPattern, FREERDP_SHARED_LIBRARY_PREFIX "%s-client-%s-%s.%s",
                    pszName, pszSubsystem, pszType, pszExtension);
  }
  else if (pszName && pszType)
  {
    (void)sprintf_s(pszPattern, cchPattern, FREERDP_SHARED_LIBRARY_PREFIX "%s-client-?-%s.%s",
                    pszName, pszType, pszExtension);
  }
  else if (pszName)
  {
    (void)sprintf_s(pszPattern, cchPattern, FREERDP_SHARED_LIBRARY_PREFIX "%s-client*.%s",
                    pszName, pszExtension);
  }
  else
  {
    (void)sprintf_s(pszPattern, cchPattern, FREERDP_SHARED_LIBRARY_PREFIX "?-client*.%s",
                    pszExtension);
  }
 
  cchPattern = strnlen(pszPattern, cchPattern);
  cchSearchPath = cchInstallPrefix + cchAddinPath + cchPattern + 3;
  pszSearchPath = (LPSTR)calloc(cchSearchPath + 1, sizeof(char));
 
  if (!pszSearchPath)
  {
    WLog_ERR(TAG, "malloc failed!");
    free(pszPattern);
    return NULL;
  }
 
  CopyMemory(pszSearchPath, pszInstallPrefix, cchInstallPrefix);
  pszSearchPath[cchInstallPrefix] = '\0';
  const HRESULT hr1 = NativePathCchAppendA(pszSearchPath, cchSearchPath + 1, pszAddinPath);
  const HRESULT hr2 = NativePathCchAppendA(pszSearchPath, cchSearchPath + 1, pszPattern);
  free(pszPattern);
 
  if (FAILED(hr1) || FAILED(hr2))
  {
    free(pszSearchPath);
    return NULL;
  }
 
  hFind = FindFirstFileUTF8(pszSearchPath, &FindData);
 
  free(pszSearchPath);
  nAddins = 0;
  ppAddins = (FREERDP_ADDIN**)calloc(128, sizeof(FREERDP_ADDIN*));
 
  if (!ppAddins)
  {
    FindClose(hFind);
    WLog_ERR(TAG, "calloc failed!");
    return NULL;
  }
 
  if (hFind == INVALID_HANDLE_VALUE)
    return ppAddins;
 
  do
  {
    char* cFileName = NULL;
    BOOL used = FALSE;
    FREERDP_ADDIN* pAddin = (FREERDP_ADDIN*)calloc(1, sizeof(FREERDP_ADDIN));
 
    if (!pAddin)
    {
      WLog_ERR(TAG, "calloc failed!");
      goto error_out;
    }
 
    cFileName =
        ConvertWCharNToUtf8Alloc(FindData.cFileName, ARRAYSIZE(FindData.cFileName), NULL);
    if (!cFileName)
      goto skip;
 
    nDashes = 0;
    for (size_t index = 0; cFileName[index]; index++)
      nDashes += (cFileName[index] == '-') ? 1 : 0;
 
    if (nDashes == 1)
    {
      size_t len = 0;
      char* p[2] = { 0 };
      /* <name>-client.<extension> */
      p[0] = cFileName;
      p[1] = strchr(p[0], '-');
      if (!p[1])
        goto skip;
      p[1] += 1;
 
      len = (size_t)(p[1] - p[0]);
      if (len < 1)
      {
        WLog_WARN(TAG, "Skipping file '%s', invalid format", cFileName);
        goto skip;
      }
      strncpy(pAddin->cName, p[0], MIN(ARRAYSIZE(pAddin->cName), len - 1));
 
      pAddin->dwFlags = FREERDP_ADDIN_CLIENT;
      pAddin->dwFlags |= FREERDP_ADDIN_DYNAMIC;
      pAddin->dwFlags |= FREERDP_ADDIN_NAME;
      ppAddins[nAddins++] = pAddin;
 
      used = TRUE;
    }
    else if (nDashes == 2)
    {
      size_t len = 0;
      char* p[4] = { 0 };
      /* <name>-client-<subsystem>.<extension> */
      p[0] = cFileName;
      p[1] = strchr(p[0], '-');
      if (!p[1])
        goto skip;
      p[1] += 1;
      p[2] = strchr(p[1], '-');
      if (!p[2])
        goto skip;
      p[2] += 1;
      p[3] = strchr(p[2], '.');
      if (!p[3])
        goto skip;
      p[3] += 1;
 
      len = (size_t)(p[1] - p[0]);
      if (len < 1)
      {
        WLog_WARN(TAG, "Skipping file '%s', invalid format", cFileName);
        goto skip;
      }
      strncpy(pAddin->cName, p[0], MIN(ARRAYSIZE(pAddin->cName), len - 1));
 
      len = (size_t)(p[3] - p[2]);
      if (len < 1)
      {
        WLog_WARN(TAG, "Skipping file '%s', invalid format", cFileName);
        goto skip;
      }
      strncpy(pAddin->cSubsystem, p[2], MIN(ARRAYSIZE(pAddin->cSubsystem), len - 1));
 
      pAddin->dwFlags = FREERDP_ADDIN_CLIENT;
      pAddin->dwFlags |= FREERDP_ADDIN_DYNAMIC;
      pAddin->dwFlags |= FREERDP_ADDIN_NAME;
      pAddin->dwFlags |= FREERDP_ADDIN_SUBSYSTEM;
      ppAddins[nAddins++] = pAddin;
 
      used = TRUE;
    }
    else if (nDashes == 3)
    {
      size_t len = 0;
      char* p[5] = { 0 };
      /* <name>-client-<subsystem>-<type>.<extension> */
      p[0] = cFileName;
      p[1] = strchr(p[0], '-');
      if (!p[1])
        goto skip;
      p[1] += 1;
      p[2] = strchr(p[1], '-');
      if (!p[2])
        goto skip;
      p[2] += 1;
      p[3] = strchr(p[2], '-');
      if (!p[3])
        goto skip;
      p[3] += 1;
      p[4] = strchr(p[3], '.');
      if (!p[4])
        goto skip;
      p[4] += 1;
 
      len = (size_t)(p[1] - p[0]);
      if (len < 1)
      {
        WLog_WARN(TAG, "Skipping file '%s', invalid format", cFileName);
        goto skip;
      }
      strncpy(pAddin->cName, p[0], MIN(ARRAYSIZE(pAddin->cName), len - 1));
 
      len = (size_t)(p[3] - p[2]);
      if (len < 1)
      {
        WLog_WARN(TAG, "Skipping file '%s', invalid format", cFileName);
        goto skip;
      }
      strncpy(pAddin->cSubsystem, p[2], MIN(ARRAYSIZE(pAddin->cSubsystem), len - 1));
 
      len = (size_t)(p[4] - p[3]);
      if (len < 1)
      {
        WLog_WARN(TAG, "Skipping file '%s', invalid format", cFileName);
        goto skip;
      }
      strncpy(pAddin->cType, p[3], MIN(ARRAYSIZE(pAddin->cType), len - 1));
 
      pAddin->dwFlags = FREERDP_ADDIN_CLIENT;
      pAddin->dwFlags |= FREERDP_ADDIN_DYNAMIC;
      pAddin->dwFlags |= FREERDP_ADDIN_NAME;
      pAddin->dwFlags |= FREERDP_ADDIN_SUBSYSTEM;
      pAddin->dwFlags |= FREERDP_ADDIN_TYPE;
      ppAddins[nAddins++] = pAddin;
 
      used = TRUE;
    }
 
  skip:
    free(cFileName);
    if (!used)
      free(pAddin);
 
  } while (FindNextFileW(hFind, &FindData));
 
  FindClose(hFind);
  ppAddins[nAddins] = NULL;
  return ppAddins;
error_out:
  FindClose(hFind);
  freerdp_channels_addin_list_free(ppAddins);
  return NULL;
}
 
FREERDP_ADDIN** freerdp_channels_list_addins(LPCSTR pszName, LPCSTR pszSubsystem, LPCSTR pszType,
                                             DWORD dwFlags)
{
  if (dwFlags & FREERDP_ADDIN_STATIC)
    return freerdp_channels_list_client_static_addins(pszName, pszSubsystem, pszType, dwFlags);
  else if (dwFlags & FREERDP_ADDIN_DYNAMIC)
    return freerdp_channels_list_dynamic_addins(pszName, pszSubsystem, pszType, dwFlags);
 
  return NULL;
}
 
void freerdp_channels_addin_list_free(FREERDP_ADDIN** ppAddins)
{
  if (!ppAddins)
    return;
 
  for (size_t index = 0; ppAddins[index] != NULL; index++)
    free(ppAddins[index]);
 
  free(ppAddins);
}
 
extern const STATIC_ENTRY CLIENT_VirtualChannelEntryEx_TABLE[];
 
static BOOL freerdp_channels_is_virtual_channel_entry_ex(LPCSTR pszName)
{
  for (size_t i = 0; CLIENT_VirtualChannelEntryEx_TABLE[i].name != NULL; i++)
  {
    const STATIC_ENTRY* entry = &CLIENT_VirtualChannelEntryEx_TABLE[i];
 
    if (!strncmp(entry->name, pszName, MAX_PATH))
      return TRUE;
  }
 
  return FALSE;
}
 
PVIRTUALCHANNELENTRY freerdp_channels_load_static_addin_entry(LPCSTR pszName, LPCSTR pszSubsystem,
                                                              LPCSTR pszType, DWORD dwFlags)
{
  const STATIC_ADDIN_TABLE* table = CLIENT_STATIC_ADDIN_TABLE;
  const char* type = NULL;
 
  if (!pszName)
    return NULL;
 
  if (dwFlags & FREERDP_ADDIN_CHANNEL_DYNAMIC)
    type = "DVCPluginEntry";
  else if (dwFlags & FREERDP_ADDIN_CHANNEL_DEVICE)
    type = "DeviceServiceEntry";
  else if (dwFlags & FREERDP_ADDIN_CHANNEL_STATIC)
  {
    if (dwFlags & FREERDP_ADDIN_CHANNEL_ENTRYEX)
      type = "VirtualChannelEntryEx";
    else
      type = "VirtualChannelEntry";
  }
 
  for (; table->name != NULL; table++)
  {
    if (strncmp(table->name, pszName, MAX_PATH) == 0)
    {
      if (type && (strncmp(table->type, type, MAX_PATH) != 0))
        continue;
 
      if (pszSubsystem != NULL)
      {
        const STATIC_SUBSYSTEM_ENTRY* subsystems = table->table;
 
        for (; subsystems->name != NULL; subsystems++)
        {
          /* If the pszSubsystem is an empty string use the default backend. */
          if ((strnlen(pszSubsystem, 1) ==
               0) || /* we only want to know if strnlen is > 0 */
              (strncmp(subsystems->name, pszSubsystem, MAX_PATH) == 0))
          {
            static_subsystem_entry_fn_t fkt = subsystems->entry;
 
            if (pszType)
            {
              if (strncmp(subsystems->type, pszType, MAX_PATH) == 0)
                return WINPR_FUNC_PTR_CAST(fkt, PVIRTUALCHANNELENTRY);
            }
            else
              return WINPR_FUNC_PTR_CAST(fkt, PVIRTUALCHANNELENTRY);
          }
        }
      }
      else
      {
        if (dwFlags & FREERDP_ADDIN_CHANNEL_ENTRYEX)
        {
          if (!freerdp_channels_is_virtual_channel_entry_ex(pszName))
            return NULL;
        }
 
        return table->entry.csevc;
      }
    }
  }
 
  return NULL;
}
 
typedef struct
{
  wMessageQueue* queue;
  wStream* data_in;
  HANDLE thread;
  char* channel_name;
  rdpContext* ctx;
  LPVOID userdata;
  MsgHandler msg_handler;
} msg_proc_internals;
 
static DWORD WINAPI channel_client_thread_proc(LPVOID userdata)
{
  UINT error = CHANNEL_RC_OK;
  wStream* data = NULL;
  wMessage message = { 0 };
  msg_proc_internals* internals = userdata;
 
  WINPR_ASSERT(internals);
 
  while (1)
  {
    if (!MessageQueue_Wait(internals->queue))
    {
      WLog_ERR(TAG, "MessageQueue_Wait failed!");
      error = ERROR_INTERNAL_ERROR;
      break;
    }
    if (!MessageQueue_Peek(internals->queue, &message, TRUE))
    {
      WLog_ERR(TAG, "MessageQueue_Peek failed!");
      error = ERROR_INTERNAL_ERROR;
      break;
    }
 
    if (message.id == WMQ_QUIT)
      break;
 
    if (message.id == 0)
    {
      data = (wStream*)message.wParam;
 
      if ((error = internals->msg_handler(internals->userdata, data)))
      {
        WLog_ERR(TAG, "msg_handler failed with error %" PRIu32 "!", error);
        break;
      }
    }
  }
  if (error && internals->ctx)
  {
    char msg[128];
    (void)_snprintf(msg, 127,
                    "%s_virtual_channel_client_thread reported an"
                    " error",
                    internals->channel_name);
    setChannelError(internals->ctx, error, msg);
  }
  ExitThread(error);
  return error;
}
 
static void free_msg(void* obj)
{
  wMessage* msg = (wMessage*)obj;
 
  if (msg && (msg->id == 0))
  {
    wStream* s = (wStream*)msg->wParam;
    Stream_Free(s, TRUE);
  }
}
 
static void channel_client_handler_free(msg_proc_internals* internals)
{
  if (!internals)
    return;
 
  if (internals->thread)
    (void)CloseHandle(internals->thread);
  MessageQueue_Free(internals->queue);
  Stream_Free(internals->data_in, TRUE);
  free(internals->channel_name);
  free(internals);
}
 
/*  Create message queue and thread or not, depending on settings */
void* channel_client_create_handler(rdpContext* ctx, LPVOID userdata, MsgHandler msg_handler,
                                    const char* channel_name)
{
  msg_proc_internals* internals = calloc(1, sizeof(msg_proc_internals));
  if (!internals)
  {
    WLog_ERR(TAG, "calloc failed!");
    return NULL;
  }
  internals->msg_handler = msg_handler;
  internals->userdata = userdata;
  if (channel_name)
  {
    internals->channel_name = _strdup(channel_name);
    if (!internals->channel_name)
      goto fail;
  }
  WINPR_ASSERT(ctx);
  WINPR_ASSERT(ctx->settings);
  internals->ctx = ctx;
  if ((freerdp_settings_get_uint32(ctx->settings, FreeRDP_ThreadingFlags) &
       THREADING_FLAGS_DISABLE_THREADS) == 0)
  {
    wObject obj = { 0 };
    obj.fnObjectFree = free_msg;
    internals->queue = MessageQueue_New(&obj);
    if (!internals->queue)
    {
      WLog_ERR(TAG, "MessageQueue_New failed!");
      goto fail;
    }
 
    if (!(internals->thread =
              CreateThread(NULL, 0, channel_client_thread_proc, (void*)internals, 0, NULL)))
    {
      WLog_ERR(TAG, "CreateThread failed!");
      goto fail;
    }
  }
  return internals;
 
fail:
  channel_client_handler_free(internals);
  return NULL;
}
/* post a message in the queue or directly call the processing handler */
UINT channel_client_post_message(void* MsgsHandle, LPVOID pData, UINT32 dataLength,
                                 UINT32 totalLength, UINT32 dataFlags)
{
  msg_proc_internals* internals = MsgsHandle;
  wStream* data_in = NULL;
 
  if (!internals)
  {
    /* TODO: return some error here */
    return CHANNEL_RC_OK;
  }
 
  if ((dataFlags & CHANNEL_FLAG_SUSPEND) || (dataFlags & CHANNEL_FLAG_RESUME))
  {
    return CHANNEL_RC_OK;
  }
 
  if (dataFlags & CHANNEL_FLAG_FIRST)
  {
    if (internals->data_in)
    {
      if (!Stream_EnsureCapacity(internals->data_in, totalLength))
        return CHANNEL_RC_NO_MEMORY;
    }
    else
      internals->data_in = Stream_New(NULL, totalLength);
  }
 
  if (!(data_in = internals->data_in))
  {
    WLog_ERR(TAG, "Stream_New failed!");
    return CHANNEL_RC_NO_MEMORY;
  }
 
  if (!Stream_EnsureRemainingCapacity(data_in, dataLength))
  {
    Stream_Free(internals->data_in, TRUE);
    internals->data_in = NULL;
    return CHANNEL_RC_NO_MEMORY;
  }
 
  Stream_Write(data_in, pData, dataLength);
 
  if (dataFlags & CHANNEL_FLAG_LAST)
  {
    if (Stream_Capacity(data_in) != Stream_GetPosition(data_in))
    {
      char msg[128];
      (void)_snprintf(msg, 127, "%s_plugin_process_received: read error",
                      internals->channel_name);
      WLog_ERR(TAG, msg);
      return ERROR_INTERNAL_ERROR;
    }
 
    internals->data_in = NULL;
    Stream_SealLength(data_in);
    Stream_SetPosition(data_in, 0);
 
    if ((freerdp_settings_get_uint32(internals->ctx->settings, FreeRDP_ThreadingFlags) &
         THREADING_FLAGS_DISABLE_THREADS) != 0)
    {
      UINT error = CHANNEL_RC_OK;
      if ((error = internals->msg_handler(internals->userdata, data_in)))
      {
        WLog_ERR(TAG,
                 "msg_handler failed with error"
                 " %" PRIu32 "!",
                 error);
        return ERROR_INTERNAL_ERROR;
      }
    }
    else if (!MessageQueue_Post(internals->queue, NULL, 0, (void*)data_in, NULL))
    {
      WLog_ERR(TAG, "MessageQueue_Post failed!");
      return ERROR_INTERNAL_ERROR;
    }
  }
  return CHANNEL_RC_OK;
}
/* Tear down queue and thread */
UINT channel_client_quit_handler(void* MsgsHandle)
{
  msg_proc_internals* internals = MsgsHandle;
  UINT rc = 0;
  if (!internals)
  {
    /* TODO: return some error here */
    return CHANNEL_RC_OK;
  }
 
  WINPR_ASSERT(internals->ctx);
  WINPR_ASSERT(internals->ctx->settings);
 
  if ((freerdp_settings_get_uint32(internals->ctx->settings, FreeRDP_ThreadingFlags) &
       THREADING_FLAGS_DISABLE_THREADS) == 0)
  {
    if (internals->queue && internals->thread)
    {
      if (MessageQueue_PostQuit(internals->queue, 0) &&
          (WaitForSingleObject(internals->thread, INFINITE) == WAIT_FAILED))
      {
        rc = GetLastError();
        WLog_ERR(TAG, "WaitForSingleObject failed with error %" PRIu32 "", rc);
        return rc;
      }
    }
  }
 
  channel_client_handler_free(internals);
  return CHANNEL_RC_OK;
}