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393 lines
10 KiB
C
393 lines
10 KiB
C
/**
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* \addtogroup exampleapps
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* @{
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*/
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/**
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* \defgroup telnetd Telnet server
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* @{
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*
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* The uIP telnet server provides a command based interface to uIP. It
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* allows using the "telnet" application to access uIP, and implements
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* the required telnet option negotiation.
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*
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* The code is structured in a way which makes it possible to add
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* commands without having to rewrite the main telnet code. The main
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* telnet code calls two callback functions, telnetd_connected() and
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* telnetd_input(), when a telnet connection has been established and
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* when a line of text arrives on a telnet connection. These two
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* functions can be implemented in a way which suits the particular
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* application or environment in which the uIP system is intended to
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* be run.
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*
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* The uIP distribution contains an example telnet shell
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* implementation that provides a basic set of commands.
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*/
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/**
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* \file
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* Implementation of the Telnet server.
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* \author Adam Dunkels <adam@dunkels.com>
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*/
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/*
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* Copyright (c) 2003, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the uIP TCP/IP stack.
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*
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* $Id: telnetd.c,v 1.1.2.2 2003/10/07 13:47:50 adam Exp $
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*
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*/
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#include "uip.h"
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#include "memb.h"
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#include "telnetd.h"
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#include <string.h>
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#define ISO_nl 0x0a
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#define ISO_cr 0x0d
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MEMB(linemem, TELNETD_LINELEN, TELNETD_NUMLINES);
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static u8_t i;
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#define STATE_NORMAL 0
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#define STATE_IAC 1
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#define STATE_WILL 2
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#define STATE_WONT 3
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#define STATE_DO 4
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#define STATE_DONT 5
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#define STATE_CLOSE 6
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#define TELNET_IAC 255
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#define TELNET_WILL 251
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#define TELNET_WONT 252
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#define TELNET_DO 253
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#define TELNET_DONT 254
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/*-----------------------------------------------------------------------------------*/
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static char *
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alloc_line(void)
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{
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return memb_alloc(&linemem);
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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dealloc_line(char *line)
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{
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memb_free(&linemem, line);
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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sendline(struct telnetd_state *s, char *line)
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{
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static unsigned int i;
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for(i = 0; i < TELNETD_NUMLINES; ++i) {
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if(s->lines[i] == NULL) {
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s->lines[i] = line;
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break;
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}
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}
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if(i == TELNETD_NUMLINES) {
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dealloc_line(line);
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}
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* Close a telnet session.
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*
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* This function can be called from a telnet command in order to close
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* the connection.
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*
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* \param s The connection which is to be closed.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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void
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telnetd_close(struct telnetd_state *s)
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{
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s->state = STATE_CLOSE;
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* Print a prompt on a telnet connection.
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*
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* This function can be called by the telnet command shell in order to
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* print out a command prompt.
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*
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* \param s A telnet connection.
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*
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* \param str The command prompt.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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void
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telnetd_prompt(struct telnetd_state *s, char *str)
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{
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char *line;
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line = alloc_line();
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if(line != NULL) {
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strncpy(line, str, TELNETD_LINELEN);
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sendline(s, line);
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}
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* Print out a string on a telnet connection.
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*
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* This function can be called from a telnet command parser in order
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* to print out a string of text on the connection. The two strings
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* given as arguments to the function will be concatenated, a carrige
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* return and a new line character will be added, and the line is
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* sent.
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*
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* \param s The telnet connection.
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*
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* \param str1 The first string.
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*
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* \param str2 The second string.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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void
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telnetd_output(struct telnetd_state *s, char *str1, char *str2)
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{
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static unsigned len;
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char *line;
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line = alloc_line();
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if(line != NULL) {
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len = strlen(str1);
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strncpy(line, str1, TELNETD_LINELEN);
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if(len < TELNETD_LINELEN) {
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strncpy(line + len, str2, TELNETD_LINELEN - len);
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}
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len = strlen(line);
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if(len < TELNETD_LINELEN - 2) {
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line[len] = ISO_cr;
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line[len+1] = ISO_nl;
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line[len+2] = 0;
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}
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sendline(s, line);
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}
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* Initialize the telnet server.
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*
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* This function will perform the necessary initializations and start
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* listening on TCP port 23.
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*/
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/*-----------------------------------------------------------------------------------*/
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void
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telnetd_init(void)
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{
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memb_init(&linemem);
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uip_listen(HTONS(23));
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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acked(struct telnetd_state *s)
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{
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dealloc_line(s->lines[0]);
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for(i = 1; i < TELNETD_NUMLINES; ++i) {
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s->lines[i - 1] = s->lines[i];
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}
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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senddata(struct telnetd_state *s)
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{
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if(s->lines[0] != NULL) {
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uip_send(s->lines[0], strlen(s->lines[0]));
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}
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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getchar(struct telnetd_state *s, u8_t c)
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{
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if(c == ISO_cr) {
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return;
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}
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s->buf[(int)s->bufptr] = c;
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if(s->buf[(int)s->bufptr] == ISO_nl ||
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s->bufptr == sizeof(s->buf) - 1) {
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if(s->bufptr > 0) {
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s->buf[(int)s->bufptr] = 0;
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}
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telnetd_input(s, s->buf);
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s->bufptr = 0;
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} else {
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++s->bufptr;
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}
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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sendopt(struct telnetd_state *s, u8_t option, u8_t value)
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{
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char *line;
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line = alloc_line();
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if(line != NULL) {
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line[0] = TELNET_IAC;
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line[1] = option;
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line[2] = value;
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line[3] = 0;
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sendline(s, line);
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}
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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newdata(struct telnetd_state *s)
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{
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u16_t len;
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u8_t c;
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len = uip_datalen();
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while(len > 0 && s->bufptr < sizeof(s->buf)) {
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c = *uip_appdata;
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++uip_appdata;
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--len;
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switch(s->state) {
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case STATE_IAC:
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if(c == TELNET_IAC) {
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getchar(s, c);
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s->state = STATE_NORMAL;
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} else {
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switch(c) {
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case TELNET_WILL:
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s->state = STATE_WILL;
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break;
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case TELNET_WONT:
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s->state = STATE_WONT;
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break;
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case TELNET_DO:
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s->state = STATE_DO;
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break;
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case TELNET_DONT:
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s->state = STATE_DONT;
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break;
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default:
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s->state = STATE_NORMAL;
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break;
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}
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}
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break;
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case STATE_WILL:
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/* Reply with a DONT */
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sendopt(s, TELNET_DONT, c);
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s->state = STATE_NORMAL;
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break;
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case STATE_WONT:
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/* Reply with a DONT */
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sendopt(s, TELNET_DONT, c);
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s->state = STATE_NORMAL;
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break;
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case STATE_DO:
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/* Reply with a WONT */
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sendopt(s, TELNET_WONT, c);
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s->state = STATE_NORMAL;
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break;
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case STATE_DONT:
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/* Reply with a WONT */
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sendopt(s, TELNET_WONT, c);
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s->state = STATE_NORMAL;
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break;
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case STATE_NORMAL:
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if(c == TELNET_IAC) {
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s->state = STATE_IAC;
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} else {
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getchar(s, c);
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}
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break;
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}
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}
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}
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/*-----------------------------------------------------------------------------------*/
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void
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telnetd_app(void)
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{
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struct telnetd_state *s;
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s = (struct telnetd_state *)uip_conn->appstate;
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if(uip_connected()) {
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for(i = 0; i < TELNETD_NUMLINES; ++i) {
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s->lines[i] = NULL;
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}
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s->bufptr = 0;
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s->state = STATE_NORMAL;
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telnetd_connected(s);
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senddata(s);
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return;
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}
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if(s->state == STATE_CLOSE) {
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s->state = STATE_NORMAL;
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uip_close();
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return;
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}
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if(uip_closed()) {
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telnetd_output(s, "Connection closed", "");
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}
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if(uip_aborted()) {
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telnetd_output(s, "Connection reset", "");
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}
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if(uip_timedout()) {
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telnetd_output(s, "Connection timed out", "");
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}
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if(uip_acked()) {
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acked(s);
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}
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if(uip_newdata()) {
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newdata(s);
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}
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if(uip_rexmit() ||
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uip_newdata() ||
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uip_acked()) {
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senddata(s);
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} else if(uip_poll()) {
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senddata(s);
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}
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}
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/*-----------------------------------------------------------------------------------*/
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