telnetio.c File Reference

Telnet server. More...

#include <BoardSupport/inc/stdtypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <inttypes.h>
#include <time.h>
#include <string.h>
#include <Libs/NETlib/net.h>
#include <BoardSupport/inc/BoardSpecific.h>
#include <Common/Common.h>
#include <Common/uartio.h>
#include <Common/timer.h>
#include <Common/CPrintf.h>
#include "telnetio.h"

Functions
int	TelnetPrintf (const char *format,...)
	Custom Telnet printf function. More...
void	TelnetWriteStr (const char *buffer)
	append a zero terminated string to telnet write buffer More...
int32_t	TelnetWriteChar (char c)
	append a char to telnet write buffer More...
void	Telnet_send_option (SOCKET *tcp_server, unsigned char option, unsigned char c)
	send a Telnet option More...
int	Telnet_check_message (telnet_server_type *telnet)
	Parse user commands. More...
uint32_t	Telnet_initialize_server (user_type *user, char *hello_msg, int16_t(*InputParser)(T_ComDevice *, char), T_Handle CmdTab)
	initialize Telnet Server More...
telnet_return_type *	Telnet_server (void)
	handle Telnet Server More...

Variables
unsigned char	telnet_option_msg [] = { TELNET_IAC, TELNET_WILL, 1, 0 }
uint32_t	telnet_active = 0
static telnet_server_type	telnet

Detailed Description

                          _         _             _
                       __| |    ___(_) ____ _ __ | |_
                      / _` |   / __| |/ _` | '_ \| __|
                     | (_| | _ \__ \ | (_| | | | | |_
                      \__,_|(_) ___/_|\__, |_| |_|\__|
                     Signalprocessing |___/ Technology

Author

D.SignT GmbH & Co. KG, Claus Hermbusche

Date

2017-03-28 10:00 AM

This module provides a telnet server on port 23. Each received charcter is passed to a user defined callback function for further processing (e.g. command processing). The output functions TelnetPrintf(), TelnetWriteStr()and TelnetWriteChar() use a local data buffer for all characters that should be sent over the active telnet connection. This buffer is polled for new data every 100ms (TELNET_OUTPUT_SCAN_INTERVAL). If you observe BUFFEROVERFLOW_ERROR while you try to send out multiple messages, then either try to decrease TELNET_OUTPUT_SCAN_INTERVAL or increase the used buffer (TELNET_OUTPUT_BUFFER_SIZE).

Function Documentation

void TelnetWriteStr

(

const char *

buffer

)

Parameters

buffer

- buffer to send

Returns

nothing

{
    int cnt = 0;

    /***************************************************************************
     print only if connection established
    ***************************************************************************/
    if ( tcp_get_state (telnet.server) != TCP_ESTABLISHED ) return;

    /***************************************************************************
     print to buffer
    ***************************************************************************/
    cnt = strlen (buffer);
    strncpy (&telnet.outbuffer[telnet.out_wptr], buffer, cnt);

    /***************************************************************************
     The user buffer size is limited to TELNET_OUTPUT_BUFFER_SIZE. Check for
     buffer overflow and exit if necessary.
    ***************************************************************************/
    telnet.out_wptr+=cnt;
    telnet.outbuffer[telnet.out_wptr] = 0;
    if (telnet.out_wptr > TELNET_OUTPUT_BUFFER_SIZE)
    {
        exit_code = BUFFEROVERFLOW_ERROR;
        prg_exit ("buffer overflow");
    }

    return;
}

Variable Documentation

unsigned char telnet_option_msg[] = { TELNET_IAC, TELNET_WILL, 1, 0 }

telnet_server_type telnet

static