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

/*
    FreeRTOS V7.0.1 - Copyright (C) 2011 Real Time Engineers Ltd.
	

    ***************************************************************************
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     *    for microcontrollers - completely free of charge!                  *
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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.
    >>>NOTE<<< The modification to the GPL is included to allow you to
    distribute a combined work that includes FreeRTOS without being obliged to
    provide the source code for proprietary components outside of the FreeRTOS
    kernel.  FreeRTOS is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
    more details. You should have received a copy of the GNU General Public
    License and the FreeRTOS license exception along with FreeRTOS; if not it
    can be viewed here: http://www.freertos.org/a00114.html and also obtained
    by writing to Richard Barry, contact details for whom are available on the
    FreeRTOS WEB site.

    1 tab == 4 spaces!

    http://www.FreeRTOS.org - Documentation, latest information, license and
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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"

#define cmdMAX_INPUT_SIZE	20
/*-----------------------------------------------------------*/

void vBasicTelnetServer( 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>";
const signed char *pcString;
signed char cInChar, cInputIndex;
signed char cInputString[ cmdMAX_INPUT_SIZE ];

	( 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. */
								while( ( pcString = pcProcessCommand( cInputString ) ) != NULL )
								{
									/* A string has been generated by the 
									command interpreter.  Send it. */
									lwip_send( lClientFd, pcString, strlen( ( const char * ) pcString ), 0 );
								}

								/* 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 );
			}
		} 
	}
}