FreeRDP/winpr/libwinpr/pipe/pipe.c

/**
 * WinPR: Windows Portable Runtime
 * Pipe Functions
 *
 * Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 * Copyright 2017 Armin Novak <armin.novak@thincast.com>
 * Copyright 2017 Thincast Technologies GmbH
 *
 * 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/crt.h>
#include <winpr/path.h>
#include <winpr/synch.h>
#include <winpr/handle.h>

#include <winpr/pipe.h>

#ifdef WINPR_HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifndef _WIN32

#include "../handle/handle.h"

#include <fcntl.h>
#include <errno.h>
#include <sys/un.h>
#include <sys/socket.h>
#include <winpr/assert.h>
#include <unistd.h>

#ifdef WINPR_HAVE_SYS_AIO_H
#undef WINPR_HAVE_SYS_AIO_H /* disable for now, incomplete */
#endif

#ifdef WINPR_HAVE_SYS_AIO_H
#include <aio.h>
#endif

#include "pipe.h"

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

/*
 * Since the WinPR implementation of named pipes makes use of UNIX domain
 * sockets, it is not possible to bind the same name more than once (i.e.,
 * SO_REUSEADDR does not work with UNIX domain sockets).  As a result, the
 * first call to CreateNamedPipe with name n creates a "shared" UNIX domain
 * socket descriptor that gets duplicated via dup() for the first and all
 * subsequent calls to CreateNamedPipe with name n.
 *
 * The following array keeps track of the references to the shared socked
 * descriptors. If an entry's reference count is zero the base socket
 * descriptor gets closed and the entry is removed from the list.
 */

static wArrayList* g_NamedPipeServerSockets = NULL;

typedef struct
{
	char* name;
	int serverfd;
	int references;
} NamedPipeServerSocketEntry;

static BOOL PipeIsHandled(HANDLE handle)
{
	return WINPR_HANDLE_IS_HANDLED(handle, HANDLE_TYPE_ANONYMOUS_PIPE, FALSE);
}

static int PipeGetFd(HANDLE handle)
{
	WINPR_PIPE* pipe = (WINPR_PIPE*)handle;

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

	return pipe->fd;
}

static BOOL PipeCloseHandle(HANDLE handle)
{
	WINPR_PIPE* pipe = (WINPR_PIPE*)handle;

	if (!PipeIsHandled(handle))
		return FALSE;

	if (pipe->fd != -1)
	{
		close(pipe->fd);
		pipe->fd = -1;
	}

	free(handle);
	return TRUE;
}

static BOOL PipeRead(PVOID Object, LPVOID lpBuffer, DWORD nNumberOfBytesToRead,
                     LPDWORD lpNumberOfBytesRead, LPOVERLAPPED lpOverlapped)
{
	SSIZE_T io_status = 0;
	WINPR_PIPE* pipe = NULL;
	BOOL status = TRUE;

	if (lpOverlapped)
	{
		WLog_ERR(TAG, "WinPR does not support the lpOverlapped parameter");
		SetLastError(ERROR_NOT_SUPPORTED);
		return FALSE;
	}

	pipe = (WINPR_PIPE*)Object;

	do
	{
		io_status = read(pipe->fd, lpBuffer, nNumberOfBytesToRead);
	} while ((io_status < 0) && (errno == EINTR));

	if (io_status < 0)
	{
		status = FALSE;

		switch (errno)
		{
			case EWOULDBLOCK:
				SetLastError(ERROR_NO_DATA);
				break;
		}
	}

	if (lpNumberOfBytesRead)
		*lpNumberOfBytesRead = (DWORD)io_status;

	return status;
}

static BOOL PipeWrite(PVOID Object, LPCVOID lpBuffer, DWORD nNumberOfBytesToWrite,
                      LPDWORD lpNumberOfBytesWritten, LPOVERLAPPED lpOverlapped)
{
	SSIZE_T io_status = 0;
	WINPR_PIPE* pipe = NULL;

	if (lpOverlapped)
	{
		WLog_ERR(TAG, "WinPR does not support the lpOverlapped parameter");
		SetLastError(ERROR_NOT_SUPPORTED);
		return FALSE;
	}

	pipe = (WINPR_PIPE*)Object;

	do
	{
		io_status = write(pipe->fd, lpBuffer, nNumberOfBytesToWrite);
	} while ((io_status < 0) && (errno == EINTR));

	if ((io_status < 0) && (errno == EWOULDBLOCK))
		io_status = 0;

	*lpNumberOfBytesWritten = (DWORD)io_status;
	return TRUE;
}

static HANDLE_OPS ops = { PipeIsHandled,
	                      PipeCloseHandle,
	                      PipeGetFd,
	                      NULL, /* CleanupHandle */
	                      PipeRead,
	                      NULL, /* FileReadEx */
	                      NULL, /* FileReadScatter */
	                      PipeWrite,
	                      NULL, /* FileWriteEx */
	                      NULL, /* FileWriteGather */
	                      NULL, /* FileGetFileSize */
	                      NULL, /*  FlushFileBuffers */
	                      NULL, /* FileSetEndOfFile */
	                      NULL, /* FileSetFilePointer */
	                      NULL, /* SetFilePointerEx */
	                      NULL, /* FileLockFile */
	                      NULL, /* FileLockFileEx */
	                      NULL, /* FileUnlockFile */
	                      NULL, /* FileUnlockFileEx */
	                      NULL  /* SetFileTime */
	                      ,
	                      NULL };

static BOOL NamedPipeIsHandled(HANDLE handle)
{
	return WINPR_HANDLE_IS_HANDLED(handle, HANDLE_TYPE_NAMED_PIPE, TRUE);
}

static int NamedPipeGetFd(HANDLE handle)
{
	WINPR_NAMED_PIPE* pipe = (WINPR_NAMED_PIPE*)handle;

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

	if (pipe->ServerMode)
		return pipe->serverfd;

	return pipe->clientfd;
}

static BOOL NamedPipeCloseHandle(HANDLE handle)
{
	WINPR_NAMED_PIPE* pNamedPipe = (WINPR_NAMED_PIPE*)handle;

	/* This check confuses the analyzer. Since not all handle
	 * types are handled here, it guesses that the memory of a
	 * NamedPipeHandle may leak. */
#ifndef __clang_analyzer__
	if (!NamedPipeIsHandled(handle))
		return FALSE;
#endif

	if (pNamedPipe->pfnUnrefNamedPipe)
		pNamedPipe->pfnUnrefNamedPipe(pNamedPipe);

	free(pNamedPipe->name);
	free(pNamedPipe->lpFileName);
	free(pNamedPipe->lpFilePath);

	if (pNamedPipe->serverfd != -1)
		close(pNamedPipe->serverfd);

	if (pNamedPipe->clientfd != -1)
		close(pNamedPipe->clientfd);

	free(pNamedPipe);
	return TRUE;
}

BOOL NamedPipeRead(PVOID Object, LPVOID lpBuffer, DWORD nNumberOfBytesToRead,
                   LPDWORD lpNumberOfBytesRead, LPOVERLAPPED lpOverlapped)
{
	SSIZE_T io_status = 0;
	WINPR_NAMED_PIPE* pipe = NULL;
	BOOL status = TRUE;

	if (lpOverlapped)
	{
		WLog_ERR(TAG, "WinPR does not support the lpOverlapped parameter");
		SetLastError(ERROR_NOT_SUPPORTED);
		return FALSE;
	}

	pipe = (WINPR_NAMED_PIPE*)Object;

	if (!(pipe->dwFlagsAndAttributes & FILE_FLAG_OVERLAPPED))
	{
		if (pipe->clientfd == -1)
			return FALSE;

		do
		{
			io_status = read(pipe->clientfd, lpBuffer, nNumberOfBytesToRead);
		} while ((io_status < 0) && (errno == EINTR));

		if (io_status == 0)
		{
			SetLastError(ERROR_BROKEN_PIPE);
			status = FALSE;
		}
		else if (io_status < 0)
		{
			status = FALSE;

			switch (errno)
			{
				case EWOULDBLOCK:
					SetLastError(ERROR_NO_DATA);
					break;

				default:
					SetLastError(ERROR_BROKEN_PIPE);
					break;
			}
		}

		if (lpNumberOfBytesRead)
			*lpNumberOfBytesRead = (DWORD)io_status;
	}
	else
	{
		/* Overlapped I/O */
		if (!lpOverlapped)
			return FALSE;

		if (pipe->clientfd == -1)
			return FALSE;

		pipe->lpOverlapped = lpOverlapped;
#ifdef WINPR_HAVE_SYS_AIO_H
		{
			int aio_status;
			struct aiocb cb = { 0 };

			cb.aio_fildes = pipe->clientfd;
			cb.aio_buf = lpBuffer;
			cb.aio_nbytes = nNumberOfBytesToRead;
			cb.aio_offset = lpOverlapped->Offset;
			cb.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
			cb.aio_sigevent.sigev_signo = SIGIO;
			cb.aio_sigevent.sigev_value.sival_ptr = (void*)lpOverlapped;
			InstallAioSignalHandler();
			aio_status = aio_read(&cb);
			WLog_DBG(TAG, "aio_read status: %d", aio_status);

			if (aio_status < 0)
				status = FALSE;

			return status;
		}
#else
		/* synchronous behavior */
		lpOverlapped->Internal = 0;
		lpOverlapped->InternalHigh = (ULONG_PTR)nNumberOfBytesToRead;
		lpOverlapped->Pointer = (PVOID)lpBuffer;
		SetEvent(lpOverlapped->hEvent);
#endif
	}

	return status;
}

BOOL NamedPipeWrite(PVOID Object, LPCVOID lpBuffer, DWORD nNumberOfBytesToWrite,
                    LPDWORD lpNumberOfBytesWritten, LPOVERLAPPED lpOverlapped)
{
	SSIZE_T io_status = 0;
	WINPR_NAMED_PIPE* pipe = NULL;
	BOOL status = TRUE;

	if (lpOverlapped)
	{
		WLog_ERR(TAG, "WinPR does not support the lpOverlapped parameter");
		SetLastError(ERROR_NOT_SUPPORTED);
		return FALSE;
	}

	pipe = (WINPR_NAMED_PIPE*)Object;

	if (!(pipe->dwFlagsAndAttributes & FILE_FLAG_OVERLAPPED))
	{
		if (pipe->clientfd == -1)
			return FALSE;

		do
		{
			io_status = write(pipe->clientfd, lpBuffer, nNumberOfBytesToWrite);
		} while ((io_status < 0) && (errno == EINTR));

		if (io_status < 0)
		{
			*lpNumberOfBytesWritten = 0;

			switch (errno)
			{
				case EWOULDBLOCK:
					io_status = 0;
					status = TRUE;
					break;

				default:
					status = FALSE;
			}
		}

		*lpNumberOfBytesWritten = (DWORD)io_status;
		return status;
	}
	else
	{
		/* Overlapped I/O */
		if (!lpOverlapped)
			return FALSE;

		if (pipe->clientfd == -1)
			return FALSE;

		pipe->lpOverlapped = lpOverlapped;
#ifdef WINPR_HAVE_SYS_AIO_H
		{
			struct aiocb cb = { 0 };

			cb.aio_fildes = pipe->clientfd;
			cb.aio_buf = (void*)lpBuffer;
			cb.aio_nbytes = nNumberOfBytesToWrite;
			cb.aio_offset = lpOverlapped->Offset;
			cb.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
			cb.aio_sigevent.sigev_signo = SIGIO;
			cb.aio_sigevent.sigev_value.sival_ptr = (void*)lpOverlapped;
			InstallAioSignalHandler();
			io_status = aio_write(&cb);
			WLog_DBG("aio_write status: %" PRIdz, io_status);

			if (io_status < 0)
				status = FALSE;

			return status;
		}
#else
		/* synchronous behavior */
		lpOverlapped->Internal = 1;
		lpOverlapped->InternalHigh = (ULONG_PTR)nNumberOfBytesToWrite;
		{
			union
			{
				LPCVOID cpv;
				PVOID pv;
			} cnv;
			cnv.cpv = lpBuffer;
			lpOverlapped->Pointer = cnv.pv;
		}
		SetEvent(lpOverlapped->hEvent);
#endif
	}

	return TRUE;
}

static HANDLE_OPS namedOps = { NamedPipeIsHandled,
	                           NamedPipeCloseHandle,
	                           NamedPipeGetFd,
	                           NULL, /* CleanupHandle */
	                           NamedPipeRead,
	                           NULL,
	                           NULL,
	                           NamedPipeWrite,
	                           NULL,
	                           NULL,
	                           NULL,
	                           NULL,
	                           NULL,
	                           NULL,
	                           NULL,
	                           NULL,
	                           NULL,
	                           NULL,
	                           NULL,
	                           NULL,
	                           NULL };

static BOOL InitWinPRPipeModule(void)
{
	if (g_NamedPipeServerSockets)
		return TRUE;

	g_NamedPipeServerSockets = ArrayList_New(FALSE);
	return g_NamedPipeServerSockets != NULL;
}

/*
 * Unnamed pipe
 */

BOOL CreatePipe(PHANDLE hReadPipe, PHANDLE hWritePipe, LPSECURITY_ATTRIBUTES lpPipeAttributes,
                DWORD nSize)
{
	int pipe_fd[2];
	WINPR_PIPE* pReadPipe = NULL;
	WINPR_PIPE* pWritePipe = NULL;

	WINPR_UNUSED(lpPipeAttributes);
	WINPR_UNUSED(nSize);

	pipe_fd[0] = -1;
	pipe_fd[1] = -1;

	if (pipe(pipe_fd) < 0)
	{
		WLog_ERR(TAG, "failed to create pipe");
		return FALSE;
	}

	pReadPipe = (WINPR_PIPE*)calloc(1, sizeof(WINPR_PIPE));
	pWritePipe = (WINPR_PIPE*)calloc(1, sizeof(WINPR_PIPE));

	if (!pReadPipe || !pWritePipe)
	{
		free(pReadPipe);
		free(pWritePipe);
		return FALSE;
	}

	pReadPipe->fd = pipe_fd[0];
	pWritePipe->fd = pipe_fd[1];
	WINPR_HANDLE_SET_TYPE_AND_MODE(pReadPipe, HANDLE_TYPE_ANONYMOUS_PIPE, WINPR_FD_READ);
	pReadPipe->common.ops = &ops;
	*((ULONG_PTR*)hReadPipe) = (ULONG_PTR)pReadPipe;
	WINPR_HANDLE_SET_TYPE_AND_MODE(pWritePipe, HANDLE_TYPE_ANONYMOUS_PIPE, WINPR_FD_READ);
	pWritePipe->common.ops = &ops;
	*((ULONG_PTR*)hWritePipe) = (ULONG_PTR)pWritePipe;
	return TRUE;
}

/**
 * Named pipe
 */

static void winpr_unref_named_pipe(WINPR_NAMED_PIPE* pNamedPipe)
{
	size_t index = 0;
	NamedPipeServerSocketEntry* baseSocket = NULL;

	if (!pNamedPipe)
		return;

	WINPR_ASSERT(pNamedPipe->name);
	WINPR_ASSERT(g_NamedPipeServerSockets);
	// WLog_VRB(TAG, "%p (%s)", (void*) pNamedPipe, pNamedPipe->name);
	ArrayList_Lock(g_NamedPipeServerSockets);

	for (index = 0; index < ArrayList_Count(g_NamedPipeServerSockets); index++)
	{
		baseSocket =
		    (NamedPipeServerSocketEntry*)ArrayList_GetItem(g_NamedPipeServerSockets, index);
		WINPR_ASSERT(baseSocket->name);

		if (!strcmp(baseSocket->name, pNamedPipe->name))
		{
			WINPR_ASSERT(baseSocket->references > 0);
			WINPR_ASSERT(baseSocket->serverfd != -1);

			if (--baseSocket->references == 0)
			{
				// WLog_DBG(TAG, "removing shared server socked resource");
				// WLog_DBG(TAG, "closing shared serverfd %d", baseSocket->serverfd);
				ArrayList_Remove(g_NamedPipeServerSockets, baseSocket);
				close(baseSocket->serverfd);
				free(baseSocket->name);
				free(baseSocket);
			}

			break;
		}
	}

	ArrayList_Unlock(g_NamedPipeServerSockets);
}

HANDLE CreateNamedPipeA(LPCSTR lpName, DWORD dwOpenMode, DWORD dwPipeMode, DWORD nMaxInstances,
                        DWORD nOutBufferSize, DWORD nInBufferSize, DWORD nDefaultTimeOut,
                        LPSECURITY_ATTRIBUTES lpSecurityAttributes)
{
	size_t index = 0;
	char* lpPipePath = NULL;
	WINPR_NAMED_PIPE* pNamedPipe = NULL;
	int serverfd = -1;
	NamedPipeServerSocketEntry* baseSocket = NULL;

	WINPR_UNUSED(lpSecurityAttributes);

	if (dwOpenMode & FILE_FLAG_OVERLAPPED)
	{
		WLog_ERR(TAG, "WinPR does not support the FILE_FLAG_OVERLAPPED flag");
		SetLastError(ERROR_NOT_SUPPORTED);
		return INVALID_HANDLE_VALUE;
	}

	if (!lpName)
		return INVALID_HANDLE_VALUE;

	if (!InitWinPRPipeModule())
		return INVALID_HANDLE_VALUE;

	pNamedPipe = (WINPR_NAMED_PIPE*)calloc(1, sizeof(WINPR_NAMED_PIPE));

	if (!pNamedPipe)
		return INVALID_HANDLE_VALUE;

	ArrayList_Lock(g_NamedPipeServerSockets);
	WINPR_HANDLE_SET_TYPE_AND_MODE(pNamedPipe, HANDLE_TYPE_NAMED_PIPE, WINPR_FD_READ);
	pNamedPipe->serverfd = -1;
	pNamedPipe->clientfd = -1;

	if (!(pNamedPipe->name = _strdup(lpName)))
		goto out;

	if (!(pNamedPipe->lpFileName = GetNamedPipeNameWithoutPrefixA(lpName)))
		goto out;

	if (!(pNamedPipe->lpFilePath = GetNamedPipeUnixDomainSocketFilePathA(lpName)))
		goto out;

	pNamedPipe->dwOpenMode = dwOpenMode;
	pNamedPipe->dwPipeMode = dwPipeMode;
	pNamedPipe->nMaxInstances = nMaxInstances;
	pNamedPipe->nOutBufferSize = nOutBufferSize;
	pNamedPipe->nInBufferSize = nInBufferSize;
	pNamedPipe->nDefaultTimeOut = nDefaultTimeOut;
	pNamedPipe->dwFlagsAndAttributes = dwOpenMode;
	pNamedPipe->clientfd = -1;
	pNamedPipe->ServerMode = TRUE;
	pNamedPipe->common.ops = &namedOps;

	for (index = 0; index < ArrayList_Count(g_NamedPipeServerSockets); index++)
	{
		baseSocket =
		    (NamedPipeServerSocketEntry*)ArrayList_GetItem(g_NamedPipeServerSockets, index);

		if (!strcmp(baseSocket->name, lpName))
		{
			serverfd = baseSocket->serverfd;
			// WLog_DBG(TAG, "using shared socked resource for pipe %p (%s)", (void*) pNamedPipe,
			// lpName);
			break;
		}
	}

	/* If this is the first instance of the named pipe... */
	if (serverfd == -1)
	{
		struct sockaddr_un s = { 0 };
		/* Create the UNIX domain socket and start listening. */
		if (!(lpPipePath = GetNamedPipeUnixDomainSocketBaseFilePathA()))
			goto out;

		if (!winpr_PathFileExists(lpPipePath))
		{
			if (!CreateDirectoryA(lpPipePath, 0))
			{
				free(lpPipePath);
				goto out;
			}

			UnixChangeFileMode(lpPipePath, 0xFFFF);
		}

		free(lpPipePath);

		if (winpr_PathFileExists(pNamedPipe->lpFilePath))
			winpr_DeleteFile(pNamedPipe->lpFilePath);

		if ((serverfd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
		{
			char ebuffer[256] = { 0 };
			WLog_ERR(TAG, "CreateNamedPipeA: socket error, %s",
			         winpr_strerror(errno, ebuffer, sizeof(ebuffer)));
			goto out;
		}

		s.sun_family = AF_UNIX;
		sprintf_s(s.sun_path, ARRAYSIZE(s.sun_path), "%s", pNamedPipe->lpFilePath);

		if (bind(serverfd, (struct sockaddr*)&s, sizeof(struct sockaddr_un)) == -1)
		{
			char ebuffer[256] = { 0 };
			WLog_ERR(TAG, "CreateNamedPipeA: bind error, %s",
			         winpr_strerror(errno, ebuffer, sizeof(ebuffer)));
			goto out;
		}

		if (listen(serverfd, 2) == -1)
		{
			char ebuffer[256] = { 0 };
			WLog_ERR(TAG, "CreateNamedPipeA: listen error, %s",
			         winpr_strerror(errno, ebuffer, sizeof(ebuffer)));
			goto out;
		}

		UnixChangeFileMode(pNamedPipe->lpFilePath, 0xFFFF);

		if (!(baseSocket = (NamedPipeServerSocketEntry*)malloc(sizeof(NamedPipeServerSocketEntry))))
			goto out;

		if (!(baseSocket->name = _strdup(lpName)))
		{
			free(baseSocket);
			goto out;
		}

		baseSocket->serverfd = serverfd;
		baseSocket->references = 0;

		if (!ArrayList_Append(g_NamedPipeServerSockets, baseSocket))
		{
			free(baseSocket->name);
			goto out;
		}

		// WLog_DBG(TAG, "created shared socked resource for pipe %p (%s). base serverfd = %d",
		// (void*) pNamedPipe, lpName, serverfd);
	}

	pNamedPipe->serverfd = dup(baseSocket->serverfd);
	// WLog_DBG(TAG, "using serverfd %d (duplicated from %d)", pNamedPipe->serverfd,
	// baseSocket->serverfd);
	pNamedPipe->pfnUnrefNamedPipe = winpr_unref_named_pipe;
	baseSocket->references++;

	if (dwOpenMode & FILE_FLAG_OVERLAPPED)
	{
#if 0
		int flags = fcntl(pNamedPipe->serverfd, F_GETFL);

		if (flags != -1)
			fcntl(pNamedPipe->serverfd, F_SETFL, flags | O_NONBLOCK);

#endif
	}

	ArrayList_Unlock(g_NamedPipeServerSockets);
	return pNamedPipe;
out:
	NamedPipeCloseHandle(pNamedPipe);

	if (serverfd != -1)
		close(serverfd);

	ArrayList_Unlock(g_NamedPipeServerSockets);
	return INVALID_HANDLE_VALUE;
}

HANDLE CreateNamedPipeW(LPCWSTR lpName, DWORD dwOpenMode, DWORD dwPipeMode, DWORD nMaxInstances,
                        DWORD nOutBufferSize, DWORD nInBufferSize, DWORD nDefaultTimeOut,
                        LPSECURITY_ATTRIBUTES lpSecurityAttributes)
{
	WLog_ERR(TAG, "is not implemented");
	SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
	return NULL;
}

BOOL ConnectNamedPipe(HANDLE hNamedPipe, LPOVERLAPPED lpOverlapped)
{
	int status = 0;
	socklen_t length = 0;
	WINPR_NAMED_PIPE* pNamedPipe = NULL;

	if (lpOverlapped)
	{
		WLog_ERR(TAG, "WinPR does not support the lpOverlapped parameter");
		SetLastError(ERROR_NOT_SUPPORTED);
		return FALSE;
	}

	if (!hNamedPipe)
		return FALSE;

	pNamedPipe = (WINPR_NAMED_PIPE*)hNamedPipe;

	if (!(pNamedPipe->dwFlagsAndAttributes & FILE_FLAG_OVERLAPPED))
	{
		struct sockaddr_un s = { 0 };
		length = sizeof(struct sockaddr_un);
		status = accept(pNamedPipe->serverfd, (struct sockaddr*)&s, &length);

		if (status < 0)
		{
			WLog_ERR(TAG, "ConnectNamedPipe: accept error");
			return FALSE;
		}

		pNamedPipe->clientfd = status;
		pNamedPipe->ServerMode = FALSE;
	}
	else
	{
		if (!lpOverlapped)
			return FALSE;

		if (pNamedPipe->serverfd == -1)
			return FALSE;

		pNamedPipe->lpOverlapped = lpOverlapped;
		/* synchronous behavior */
		lpOverlapped->Internal = 2;
		lpOverlapped->InternalHigh = (ULONG_PTR)0;
		lpOverlapped->Pointer = (PVOID)NULL;
		SetEvent(lpOverlapped->hEvent);
	}

	return TRUE;
}

BOOL DisconnectNamedPipe(HANDLE hNamedPipe)
{
	WINPR_NAMED_PIPE* pNamedPipe = NULL;
	pNamedPipe = (WINPR_NAMED_PIPE*)hNamedPipe;

	if (pNamedPipe->clientfd != -1)
	{
		close(pNamedPipe->clientfd);
		pNamedPipe->clientfd = -1;
	}

	return TRUE;
}

BOOL PeekNamedPipe(HANDLE hNamedPipe, LPVOID lpBuffer, DWORD nBufferSize, LPDWORD lpBytesRead,
                   LPDWORD lpTotalBytesAvail, LPDWORD lpBytesLeftThisMessage)
{
	WLog_ERR(TAG, "Not implemented");
	SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
	return FALSE;
}

BOOL TransactNamedPipe(HANDLE hNamedPipe, LPVOID lpInBuffer, DWORD nInBufferSize,
                       LPVOID lpOutBuffer, DWORD nOutBufferSize, LPDWORD lpBytesRead,
                       LPOVERLAPPED lpOverlapped)
{
	WLog_ERR(TAG, "Not implemented");
	SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
	return FALSE;
}

BOOL WaitNamedPipeA(LPCSTR lpNamedPipeName, DWORD nTimeOut)
{
	BOOL status = 0;
	DWORD nWaitTime = 0;
	char* lpFilePath = NULL;
	DWORD dwSleepInterval = 0;

	if (!lpNamedPipeName)
		return FALSE;

	lpFilePath = GetNamedPipeUnixDomainSocketFilePathA(lpNamedPipeName);

	if (!lpFilePath)
		return FALSE;

	if (nTimeOut == NMPWAIT_USE_DEFAULT_WAIT)
		nTimeOut = 50;

	nWaitTime = 0;
	status = TRUE;
	dwSleepInterval = 10;

	while (!winpr_PathFileExists(lpFilePath))
	{
		Sleep(dwSleepInterval);
		nWaitTime += dwSleepInterval;

		if (nWaitTime >= nTimeOut)
		{
			status = FALSE;
			break;
		}
	}

	free(lpFilePath);
	return status;
}

BOOL WaitNamedPipeW(LPCWSTR lpNamedPipeName, DWORD nTimeOut)
{
	WLog_ERR(TAG, "Not implemented");
	SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
	return FALSE;
}

BOOL SetNamedPipeHandleState(HANDLE hNamedPipe, LPDWORD lpMode, LPDWORD lpMaxCollectionCount,
                             LPDWORD lpCollectDataTimeout)
{
	int fd = 0;
	int flags = 0;
	WINPR_NAMED_PIPE* pNamedPipe = NULL;
	pNamedPipe = (WINPR_NAMED_PIPE*)hNamedPipe;

	if (lpMode)
	{
		pNamedPipe->dwPipeMode = *lpMode;
		fd = (pNamedPipe->ServerMode) ? pNamedPipe->serverfd : pNamedPipe->clientfd;

		if (fd == -1)
			return FALSE;

		flags = fcntl(fd, F_GETFL);

		if (flags < 0)
			return FALSE;

		if (pNamedPipe->dwPipeMode & PIPE_NOWAIT)
			flags = (flags | O_NONBLOCK);
		else
			flags = (flags & ~(O_NONBLOCK));

		if (fcntl(fd, F_SETFL, flags) < 0)
			return FALSE;
	}

	if (lpMaxCollectionCount)
	{
	}

	if (lpCollectDataTimeout)
	{
	}

	return TRUE;
}

BOOL ImpersonateNamedPipeClient(HANDLE hNamedPipe)
{
	WLog_ERR(TAG, "Not implemented");
	SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
	return FALSE;
}

BOOL GetNamedPipeClientComputerNameA(HANDLE Pipe, LPCSTR ClientComputerName,
                                     ULONG ClientComputerNameLength)
{
	WLog_ERR(TAG, "Not implemented");
	SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
	return FALSE;
}

BOOL GetNamedPipeClientComputerNameW(HANDLE Pipe, LPCWSTR ClientComputerName,
                                     ULONG ClientComputerNameLength)
{
	WLog_ERR(TAG, "Not implemented");
	SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
	return FALSE;
}

#endif