/**

 * FreeRDP: A Remote Desktop Protocol Implementation

 * Redirected Parallel Port Device Service

 *

 * Copyright 2010 O.S. Systems Software Ltda.

 * Copyright 2010 Eduardo Fiss Beloni <beloni@ossystems.com.br>

 * Copyright 2015 Thincast Technologies GmbH

 * Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>

 *

 * 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

#include <fcntl.h>

#include <errno.h>

#ifndef _WIN32

#include <termios.h>

#include <strings.h>

#include <sys/ioctl.h>

#endif

#ifdef __LINUX__

#include <linux/ppdev.h>

#include <linux/parport.h>

#endif

#include <winpr/crt.h>

#include <winpr/synch.h>

#include <winpr/thread.h>

#include <winpr/stream.h>

#include <winpr/collections.h>

#include <winpr/interlocked.h>

#include <freerdp/types.h>

#include <freerdp/constants.h>

#include <freerdp/channels/rdpdr.h>

#include <freerdp/channels/log.h>

#define TAG CHANNELS_TAG("drive.client")

struct _PARALLEL_DEVICE

{

	DEVICE device;

	int file;

	char* path;

	UINT32 id;

	HANDLE thread;

	wMessageQueue* queue;

	rdpContext* rdpcontext;

};

typedef struct _PARALLEL_DEVICE PARALLEL_DEVICE;

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

static UINT parallel_process_irp_create(PARALLEL_DEVICE* parallel, IRP* irp)

{

	char* path = NULL;

	int status;

	UINT32 PathLength;

	Stream_Seek(irp->input, 28);

	/* DesiredAccess(4) AllocationSize(8), FileAttributes(4) */

	/* SharedAccess(4) CreateDisposition(4), CreateOptions(4) */

	Stream_Read_UINT32(irp->input, PathLength);

	status = ConvertFromUnicode(CP_UTF8, 0, (WCHAR*) Stream_Pointer(irp->input),

	                            PathLength / 2, &path, 0, NULL, NULL);

	if (status < 1)

		if (!(path = (char*) calloc(1, 1)))

		{

			WLog_ERR(TAG, "calloc failed!");

			return CHANNEL_RC_NO_MEMORY;

		}

	parallel->id = irp->devman->id_sequence++;

	parallel->file = open(parallel->path, O_RDWR);

	if (parallel->file < 0)

	{

		irp->IoStatus = STATUS_ACCESS_DENIED;

		parallel->id = 0;

	}

	else

	{

		/* all read and write operations should be non-blocking */

		if (fcntl(parallel->file, F_SETFL, O_NONBLOCK) == -1)

		{

		}

	}

	Stream_Write_UINT32(irp->output, parallel->id);

	Stream_Write_UINT8(irp->output, 0);

	free(path);

	return irp->Complete(irp);

}

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

static UINT parallel_process_irp_close(PARALLEL_DEVICE* parallel, IRP* irp)

{

	if (close(parallel->file) < 0)

	{

	}

	else

	{

	}

	Stream_Zero(irp->output, 5); /* Padding(5) */

	return irp->Complete(irp);

}

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

static UINT parallel_process_irp_read(PARALLEL_DEVICE* parallel, IRP* irp)

{

	UINT32 Length;

	UINT64 Offset;

	ssize_t status;

	BYTE* buffer = NULL;

	Stream_Read_UINT32(irp->input, Length);

	Stream_Read_UINT64(irp->input, Offset);

	buffer = (BYTE*) malloc(Length);

	if (!buffer)

	{

		WLog_ERR(TAG, "malloc failed!");

		return CHANNEL_RC_NO_MEMORY;

	}

	status = read(parallel->file, buffer, Length);

	if (status < 0)

	{

		irp->IoStatus = STATUS_UNSUCCESSFUL;

		free(buffer);

		buffer = NULL;

		Length = 0;

	}

	else

	{

	}

	Stream_Write_UINT32(irp->output, Length);

	if (Length > 0)

	{

		if (!Stream_EnsureRemainingCapacity(irp->output, Length))

		{

			WLog_ERR(TAG, "Stream_EnsureRemainingCapacity failed!");

			free(buffer);

			return CHANNEL_RC_NO_MEMORY;

		}

		Stream_Write(irp->output, buffer, Length);

	}

	free(buffer);

	return irp->Complete(irp);

}

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

static UINT parallel_process_irp_write(PARALLEL_DEVICE* parallel, IRP* irp)

{

	UINT32 len;

	UINT32 Length;

	UINT64 Offset;

	ssize_t status;

	Stream_Read_UINT32(irp->input, Length);

	Stream_Read_UINT64(irp->input, Offset);

	Stream_Seek(irp->input, 20); /* Padding */

	len = Length;

	while (len > 0)

	{

		status = write(parallel->file, Stream_Pointer(irp->input), len);

		if (status < 0)

		{

			irp->IoStatus = STATUS_UNSUCCESSFUL;

			Length = 0;

			break;

		}

		Stream_Seek(irp->input, status);

		len -= status;

	}

	Stream_Write_UINT32(irp->output, Length);

	Stream_Write_UINT8(irp->output, 0); /* Padding */

	return irp->Complete(irp);

}

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

static UINT parallel_process_irp_device_control(PARALLEL_DEVICE* parallel,

        IRP* irp)

{

	Stream_Write_UINT32(irp->output, 0); /* OutputBufferLength */

	return irp->Complete(irp);

}

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

static UINT parallel_process_irp(PARALLEL_DEVICE* parallel, IRP* irp)

{

	UINT error;

	switch (irp->MajorFunction)

	{

		case IRP_MJ_CREATE:

			if ((error = parallel_process_irp_create(parallel, irp)))

			{

				WLog_ERR(TAG, "parallel_process_irp_create failed with error %"PRIu32"!", error);

				return error;

			}

			break;

		case IRP_MJ_CLOSE:

			if ((error = parallel_process_irp_close(parallel, irp)))

			{

				WLog_ERR(TAG, "parallel_process_irp_close failed with error %"PRIu32"!", error);

				return error;

			}

			break;

		case IRP_MJ_READ:

			if ((error = parallel_process_irp_read(parallel, irp)))

			{

				WLog_ERR(TAG, "parallel_process_irp_read failed with error %"PRIu32"!", error);

				return error;

			}

			break;

		case IRP_MJ_WRITE:

			if ((error = parallel_process_irp_write(parallel, irp)))

			{

				WLog_ERR(TAG, "parallel_process_irp_write failed with error %"PRIu32"!", error);

				return error;

			}

			break;

		case IRP_MJ_DEVICE_CONTROL:

			if ((error = parallel_process_irp_device_control(parallel, irp)))

			{

				WLog_ERR(TAG, "parallel_process_irp_device_control failed with error %"PRIu32"!",

				         error);

				return error;

			}

			break;

		default:

			irp->IoStatus = STATUS_NOT_SUPPORTED;

			return irp->Complete(irp);

			break;

	}

	return CHANNEL_RC_OK;

}

static DWORD WINAPI parallel_thread_func(LPVOID arg)

{

	IRP* irp;

	wMessage message;

	PARALLEL_DEVICE* parallel = (PARALLEL_DEVICE*) arg;

	UINT error = CHANNEL_RC_OK;

	while (1)

	{

		if (!MessageQueue_Wait(parallel->queue))

		{

			WLog_ERR(TAG, "MessageQueue_Wait failed!");

			error = ERROR_INTERNAL_ERROR;

			break;

		}

		if (!MessageQueue_Peek(parallel->queue, &message, TRUE))

		{

			WLog_ERR(TAG, "MessageQueue_Peek failed!");

			error = ERROR_INTERNAL_ERROR;

			break;

		}

		if (message.id == WMQ_QUIT)

			break;

		irp = (IRP*) message.wParam;

		if ((error = parallel_process_irp(parallel, irp)))

		{

			WLog_ERR(TAG, "parallel_process_irp failed with error %"PRIu32"!", error);

			break;

		}

	}

	if (error && parallel->rdpcontext)

		setChannelError(parallel->rdpcontext, error,

		                "parallel_thread_func reported an error");

	ExitThread(error);

	return error;

}

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

static UINT parallel_irp_request(DEVICE* device, IRP* irp)

{

	PARALLEL_DEVICE* parallel = (PARALLEL_DEVICE*) device;

	if (!MessageQueue_Post(parallel->queue, NULL, 0, (void*) irp, NULL))

	{

		WLog_ERR(TAG, "MessageQueue_Post failed!");

		return ERROR_INTERNAL_ERROR;

	}

	return CHANNEL_RC_OK;

}

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

static UINT parallel_free(DEVICE* device)

{

	UINT error;

	PARALLEL_DEVICE* parallel = (PARALLEL_DEVICE*) device;

	if (!MessageQueue_PostQuit(parallel->queue, 0)

	    || (WaitForSingleObject(parallel->thread, INFINITE) == WAIT_FAILED))

	{

		error = GetLastError();

		WLog_ERR(TAG, "WaitForSingleObject failed with error %"PRIu32"!", error);

		return error;

	}

	CloseHandle(parallel->thread);

	Stream_Free(parallel->device.data, TRUE);

	MessageQueue_Free(parallel->queue);

	free(parallel);

	return CHANNEL_RC_OK;

}

#ifdef BUILTIN_CHANNELS

#define DeviceServiceEntry	parallel_DeviceServiceEntry

#else

#define DeviceServiceEntry	FREERDP_API DeviceServiceEntry

#endif

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

UINT DeviceServiceEntry(PDEVICE_SERVICE_ENTRY_POINTS pEntryPoints)

{

	char* name;

	char* path;

	size_t i;

	size_t length;

	RDPDR_PARALLEL* device;

	PARALLEL_DEVICE* parallel;

	UINT error;

	device = (RDPDR_PARALLEL*) pEntryPoints->device;

	name = device->Name;

	path = device->Path;

	if (!name || (name[0] == '*') || !path)

	{

		/* TODO: implement auto detection of parallel ports */

		return CHANNEL_RC_INITIALIZATION_ERROR;

	}

	if (name[0] && path[0])

	{

		parallel = (PARALLEL_DEVICE*) calloc(1, sizeof(PARALLEL_DEVICE));

		if (!parallel)

		{

			WLog_ERR(TAG, "calloc failed!");

			return CHANNEL_RC_NO_MEMORY;

		}

		parallel->device.type = RDPDR_DTYP_PARALLEL;

		parallel->device.name = name;

		parallel->device.IRPRequest = parallel_irp_request;

		parallel->device.Free = parallel_free;

		parallel->rdpcontext = pEntryPoints->rdpcontext;

		length = strlen(name);

		parallel->device.data = Stream_New(NULL, length + 1);

		if (!parallel->device.data)

		{

			WLog_ERR(TAG, "Stream_New failed!");

			error = CHANNEL_RC_NO_MEMORY;

			goto error_out;

		}

		for (i = 0; i <= length; i++)

			Stream_Write_UINT8(parallel->device.data, name[i] < 0 ? '_' : name[i]);

		parallel->path = path;

		parallel->queue = MessageQueue_New(NULL);

		if (!parallel->queue)

		{

			WLog_ERR(TAG, "MessageQueue_New failed!");

			error = CHANNEL_RC_NO_MEMORY;

			goto error_out;

		}

		if ((error = pEntryPoints->RegisterDevice(pEntryPoints->devman,

		             (DEVICE*) parallel)))

		{

			WLog_ERR(TAG, "RegisterDevice failed with error %"PRIu32"!", error);

			goto error_out;

		}

		if (!(parallel->thread = CreateThread(NULL, 0,

											  parallel_thread_func, (void*) parallel, 0, NULL)))

		{

			WLog_ERR(TAG, "CreateThread failed!");

			error = ERROR_INTERNAL_ERROR;

			goto error_out;

		}

	}

	return CHANNEL_RC_OK;

error_out:

	MessageQueue_Free(parallel->queue);

	Stream_Free(parallel->device.data, TRUE);

	free(parallel);

	return error;

}