FreeRTOS-Kernel/FreeRTOS/Demo/WIN32-MSVC-lwIP/lwIP_Apps/apps/BasicSocketCommandServer/BasicSocketCommandServer.c

/*
    FreeRTOS V7.4.0 - Copyright (C) 2013 Real Time Engineers Ltd.

    FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME.  PLEASE VISIT
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    ***************************************************************************
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    This file is part of the FreeRTOS distribution.

    FreeRTOS is free software; you can redistribute it and/or modify it under
    the terms of the GNU General Public License (version 2) as published by the
    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.

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    ***************************************************************************
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*/

/* Standard includes. */
#include "stdlib.h"

/* lwIP core includes */
#include "lwip/opt.h"
#include "lwip/sockets.h"

/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"

/* Utils includes. */
#include "CommandInterpreter.h"

/* Dimensions the buffer into which input characters are placed. */
#define cmdMAX_INPUT_SIZE	20

/* Dimensions the buffer into which string outputs can be placed. */
#define cmdMAX_OUTPUT_SIZE	1024

/*-----------------------------------------------------------*/

void vBasicSocketsCommandInterpreterTask( void *pvParameters )
{
long lSocket, lClientFd, lBytes, lAddrLen = sizeof( struct sockaddr_in );
struct sockaddr_in sLocalAddr;
struct sockaddr_in client_addr;
const signed char *pcWelcomeMessage = "FreeRTOS command server - connection accepted.\r\nType Help to view a list of registered commands.\r\n\r\n>";
signed char cInChar, cInputIndex;
static signed char cInputString[ cmdMAX_INPUT_SIZE ], cOutputString[ cmdMAX_OUTPUT_SIZE ];
portBASE_TYPE xReturned;

	( void ) pvParameters;

	lSocket = lwip_socket(AF_INET, SOCK_STREAM, 0);

	if( lSocket >= 0 )
	{
		memset((char *)&sLocalAddr, 0, sizeof(sLocalAddr));
		sLocalAddr.sin_family = AF_INET;
		sLocalAddr.sin_len = sizeof(sLocalAddr);
		sLocalAddr.sin_addr.s_addr = htonl(INADDR_ANY);
		sLocalAddr.sin_port = ntohs( ( ( unsigned short ) 23 ) );

		if( lwip_bind( lSocket, ( struct sockaddr *) &sLocalAddr, sizeof( sLocalAddr ) ) < 0 ) 
		{
			lwip_close( lSocket );
			vTaskDelete( NULL );
		}

		if( lwip_listen( lSocket, 20 ) != 0 )
		{
			lwip_close( lSocket );
			vTaskDelete( NULL );
		}

		for( ;; )
		{

			lClientFd = lwip_accept(lSocket, ( struct sockaddr * ) &client_addr, ( u32_t * ) &lAddrLen );

			if( lClientFd > 0L )
			{
				lwip_send( lClientFd, pcWelcomeMessage, strlen( ( const char * ) pcWelcomeMessage ), 0 );

				cInputIndex = 0;
				memset( cInputString, 0x00, cmdMAX_INPUT_SIZE );

				do
				{					
					lBytes = lwip_recv( lClientFd, &cInChar, sizeof( cInChar ), 0 );

					if( lBytes > 0L ) 
					{
						if( cInChar == '\n' )
						{
							/* The input string has been terminated.  Was the 
							input a quit command? */
							if( strcmp( "quit", ( const char * ) cInputString ) == 0 )
							{
								/* Set lBytes to 0 to close the connection. */
								lBytes = 0L;
							}
							else
							{
								/* The input string was not a quit command.  
								Pass the string to the command interpreter. */
								do
								{
									xReturned = xCmdIntProcessCommand( cInputString, cOutputString, cmdMAX_OUTPUT_SIZE );
									lwip_send( lClientFd, cOutputString, strlen( ( const char * ) cOutputString ), 0 );

								} while( xReturned != pdFALSE );

								/* All the strings generated by the input 
								command have been sent.  Clear the input
								string ready to receive the next command. */
								cInputIndex = 0;
								memset( cInputString, 0x00, cmdMAX_INPUT_SIZE );
								lwip_send( lClientFd, "\r\n>", strlen( "\r\n>" ), 0 );
							}
						}
						else
						{
							if( cInChar == '\r' )
							{
								/* Ignore the character. */
							}
							else if( cInChar == '\b' )
							{
								/* Backspace was pressed.  Erase the last 
								character in the string - if any. */
								if( cInputIndex > 0 )
								{
									cInputIndex--;
									cInputString[ cInputIndex ] = '\0';
								}
							}
							else
							{
								/* A character was entered.  Add it to the string
								entered so far.  When a \n is entered the complete
								string will be passed to the command interpreter. */
								if( cInputIndex < cmdMAX_INPUT_SIZE )
								{
									cInputString[ cInputIndex ] = cInChar;
									cInputIndex++;
								}
							}
						}
					}

				} while( lBytes > 0L );

				 lwip_close( lClientFd );
			}
		} 
	}

	/* Will only get here if a listening socket could not be created. */
	vTaskDelete( NULL );
}