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contiki/apps/telnetd/telnetd.c

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/*
* Copyright (c) 2003, Adam Dunkels.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This file is part of the Contiki desktop OS.
*
* $Id: telnetd.c,v 1.1 2006/06/17 22:41:13 adamdunkels Exp $
*
*/
#include "contiki-net.h"
#include "lib/petsciiconv.h"
#include "contiki-lib.h"
#include "shell.h"
#include "telnetd.h"
#include <string.h>
#define ISO_nl 0x0a
#define ISO_cr 0x0d
#define XSIZE 36
#define YSIZE 12
PROCESS(telnetd_process, "Shell server");
#ifndef TELNETD_CONF_LINELEN
#define TELNETD_CONF_LINELEN 40
#endif
#ifndef TELNETD_CONF_NUMLINES
#define TELNETD_CONF_NUMLINES 16
#endif
struct telnetd_line {
char line[TELNETD_CONF_LINELEN];
};
MEMB(linemem, struct telnetd_line, TELNETD_CONF_NUMLINES);
struct telnetd_state {
char *lines[TELNETD_CONF_NUMLINES];
char buf[TELNETD_CONF_LINELEN];
char bufptr;
u8_t numsent;
u8_t state;
#define STATE_NORMAL 0
#define STATE_IAC 1
#define STATE_WILL 2
#define STATE_WONT 3
#define STATE_DO 4
#define STATE_DONT 5
#define STATE_CLOSE 6
};
static struct telnetd_state s;
#define TELNET_IAC 255
#define TELNET_WILL 251
#define TELNET_WONT 252
#define TELNET_DO 253
#define TELNET_DONT 254
/*-----------------------------------------------------------------------------------*/
static char *
alloc_line(void)
{
return memb_alloc(&linemem);
}
/*-----------------------------------------------------------------------------------*/
static void
dealloc_line(char *line)
{
memb_free(&linemem, line);
}
/*-----------------------------------------------------------------------------------*/
void
shell_quit(char *str)
{
s.state = STATE_CLOSE;
}
/*-----------------------------------------------------------------------------------*/
void
telnetd_quit(void)
{
#if TELNETD_CONF_GUI
telnetd_gui_quit();
#endif /* TELNETD_CONF_GUI */
process_exit(&telnetd_process);
LOADER_UNLOAD();
}
/*-----------------------------------------------------------------------------------*/
static void
sendline(char *line)
{
static unsigned int i;
for(i = 0; i < TELNETD_CONF_NUMLINES; ++i) {
if(s.lines[i] == NULL) {
s.lines[i] = line;
break;
}
}
if(i == TELNETD_CONF_NUMLINES) {
dealloc_line(line);
}
}
/*-----------------------------------------------------------------------------------*/
void
shell_prompt(char *str)
{
char *line;
line = alloc_line();
if(line != NULL) {
strncpy(line, str, TELNETD_CONF_LINELEN);
petsciiconv_toascii(line, TELNETD_CONF_LINELEN);
sendline(line);
}
}
/*-----------------------------------------------------------------------------------*/
void
shell_output(char *str1, char *str2)
{
static unsigned len;
char *line;
line = alloc_line();
if(line != NULL) {
len = strlen(str1);
strncpy(line, str1, TELNETD_CONF_LINELEN);
if(len < TELNETD_CONF_LINELEN) {
strncpy(line + len, str2, TELNETD_CONF_LINELEN - len);
}
len = strlen(line);
if(len < TELNETD_CONF_LINELEN - 2) {
line[len] = ISO_cr;
line[len+1] = ISO_nl;
line[len+2] = 0;
}
petsciiconv_toascii(line, TELNETD_CONF_LINELEN);
sendline(line);
}
}
/*-----------------------------------------------------------------------------------*/
PROCESS_THREAD(telnetd_process, ev, data)
{
PROCESS_BEGIN();
tcp_listen(HTONS(23));
memb_init(&linemem);
shell_init();
while(1) {
PROCESS_WAIT_EVENT();
if(ev == tcpip_event) {
telnetd_appcall(data);
} else if(ev == PROCESS_EVENT_EXIT) {
telnetd_quit();
} else {
#if TELNETD_CONF_GUI
telnetd_gui_eventhandler(ev, data);
#endif /* TELNETD_CONF_GUI */
}
}
PROCESS_END();
}
/*-----------------------------------------------------------------------------------*/
static void
acked(void)
{
static unsigned int i;
while(s.numsent > 0) {
dealloc_line(s.lines[0]);
for(i = 1; i < TELNETD_CONF_NUMLINES; ++i) {
s.lines[i - 1] = s.lines[i];
}
s.lines[TELNETD_CONF_NUMLINES - 1] = NULL;
--s.numsent;
}
}
/*-----------------------------------------------------------------------------------*/
static void
senddata(void)
{
static char *bufptr, *lineptr;
static int buflen, linelen;
bufptr = uip_appdata;
buflen = 0;
for(s.numsent = 0; s.numsent < TELNETD_CONF_NUMLINES &&
s.lines[s.numsent] != NULL ; ++s.numsent) {
lineptr = s.lines[s.numsent];
linelen = strlen(lineptr);
if(linelen > TELNETD_CONF_LINELEN) {
linelen = TELNETD_CONF_LINELEN;
}
if(buflen + linelen < uip_mss()) {
memcpy(bufptr, lineptr, linelen);
bufptr += linelen;
buflen += linelen;
} else {
break;
}
}
uip_send(uip_appdata, buflen);
}
/*-----------------------------------------------------------------------------------*/
static void
closed(void)
{
static unsigned int i;
for(i = 0; i < TELNETD_CONF_NUMLINES; ++i) {
if(s.lines[i] != NULL) {
dealloc_line(s.lines[i]);
}
}
}
/*-----------------------------------------------------------------------------------*/
static void
get_char(u8_t c)
{
if(c == ISO_cr) {
return;
}
s.buf[(int)s.bufptr] = c;
if(s.buf[(int)s.bufptr] == ISO_nl ||
s.bufptr == sizeof(s.buf) - 1) {
if(s.bufptr > 0) {
s.buf[(int)s.bufptr] = 0;
petsciiconv_topetscii(s.buf, TELNETD_CONF_LINELEN);
}
shell_input(s.buf);
s.bufptr = 0;
} else {
++s.bufptr;
}
}
/*-----------------------------------------------------------------------------------*/
static void
sendopt(u8_t option, u8_t value)
{
char *line;
line = alloc_line();
if(line != NULL) {
line[0] = TELNET_IAC;
line[1] = option;
line[2] = value;
line[3] = 0;
sendline(line);
}
}
/*-----------------------------------------------------------------------------------*/
static void
newdata(void)
{
u16_t len;
u8_t c;
len = uip_datalen();
while(len > 0 && s.bufptr < sizeof(s.buf)) {
c = *(char *)uip_appdata;
++((char *)uip_appdata);
--len;
switch(s.state) {
case STATE_IAC:
if(c == TELNET_IAC) {
get_char(c);
s.state = STATE_NORMAL;
} else {
switch(c) {
case TELNET_WILL:
s.state = STATE_WILL;
break;
case TELNET_WONT:
s.state = STATE_WONT;
break;
case TELNET_DO:
s.state = STATE_DO;
break;
case TELNET_DONT:
s.state = STATE_DONT;
break;
default:
s.state = STATE_NORMAL;
break;
}
}
break;
case STATE_WILL:
/* Reply with a DONT */
sendopt(TELNET_DONT, c);
s.state = STATE_NORMAL;
break;
case STATE_WONT:
/* Reply with a DONT */
sendopt(TELNET_DONT, c);
s.state = STATE_NORMAL;
break;
case STATE_DO:
/* Reply with a WONT */
sendopt(TELNET_WONT, c);
s.state = STATE_NORMAL;
break;
case STATE_DONT:
/* Reply with a WONT */
sendopt(TELNET_WONT, c);
s.state = STATE_NORMAL;
break;
case STATE_NORMAL:
if(c == TELNET_IAC) {
s.state = STATE_IAC;
} else {
get_char(c);
}
break;
}
}
}
/*-----------------------------------------------------------------------------------*/
void
telnetd_appcall(void *ts)
{
static unsigned int i;
if(uip_connected()) {
tcp_markconn(uip_conn, &s);
for(i = 0; i < TELNETD_CONF_NUMLINES; ++i) {
s.lines[i] = NULL;
}
s.bufptr = 0;
s.state = STATE_NORMAL;
shell_start();
}
if(s.state == STATE_CLOSE) {
s.state = STATE_NORMAL;
uip_close();
return;
}
if(uip_closed() ||
uip_aborted() ||
uip_timedout()) {
closed();
}
if(uip_acked()) {
acked();
}
if(uip_newdata()) {
newdata();
}
if(uip_rexmit() ||
uip_newdata() ||
uip_acked() ||
uip_connected() ||
uip_poll()) {
senddata();
}
}
/*-----------------------------------------------------------------------------------*/
void
program_handler_load(char *name, char *arg)
{}
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