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osd-contiki/apps/telnetd/telnetd.c
Oliver Schmidt a30e2e0045 Allow to configure Telnetd idle timeout. 
The default Telnetd idle timeout of 30 seconds seems somewhat short. Best to have it user-configurable (incl. the option to turn it off with an config value of 0).
2015-07-06 12:25:20 +02:00

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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.
*
*
*/
#include <string.h>
#include "sys/cc.h"
#include "contiki-lib.h"
#include "contiki-net.h"
#include "lib/petsciiconv.h"
#include "shell.h"
#include "telnetd.h"
#define ISO_nl 0x0a
#define ISO_cr 0x0d
PROCESS(telnetd_process, "Telnet server");
AUTOSTART_PROCESSES(&telnetd_process);
#ifndef TELNETD_CONF_LINELEN
#define TELNETD_CONF_LINELEN 80
#endif
#ifndef TELNETD_CONF_NUMLINES
#define TELNETD_CONF_NUMLINES 25
#endif
#ifdef TELNETD_CONF_REJECT
extern char telnetd_reject_text[];
#else
static char telnetd_reject_text[] =
"Too many connections, please try again later.";
#endif
#ifndef TELNETD_CONF_MAX_IDLE_TIME
#define TELNETD_CONF_MAX_IDLE_TIME (CLOCK_SECOND * 30)
#endif
struct telnetd_state {
char buf[TELNETD_CONF_LINELEN + 1];
char bufptr;
uint16_t numsent;
uint8_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
#if TELNETD_CONF_MAX_IDLE_TIME
struct timer silence_timer;
#endif /* TELNETD_CONF_MAX_IDLE_TIME */
};
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
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
struct telnetd_buf {
char bufmem[TELNETD_CONF_NUMLINES * TELNETD_CONF_LINELEN];
int ptr;
int size;
};
static struct telnetd_buf buf;
static uint8_t connected;
/*---------------------------------------------------------------------------*/
static void
buf_init(struct telnetd_buf *buf)
{
buf->ptr = 0;
buf->size = TELNETD_CONF_NUMLINES * TELNETD_CONF_LINELEN;
}
/*---------------------------------------------------------------------------*/
static int
buf_append(struct telnetd_buf *buf, const char *data, int len)
{
int copylen;
PRINTF("buf_append len %d (%d) '%.*s'\n", len, buf->ptr, len, data);
copylen = MIN(len, buf->size - buf->ptr);
memcpy(&buf->bufmem[buf->ptr], data, copylen);
petsciiconv_toascii(&buf->bufmem[buf->ptr], copylen);
buf->ptr += copylen;
return copylen;
}
/*---------------------------------------------------------------------------*/
static void
buf_copyto(struct telnetd_buf *buf, char *to, int len)
{
memcpy(to, &buf->bufmem[0], len);
}
/*---------------------------------------------------------------------------*/
static void
buf_pop(struct telnetd_buf *buf, int len)
{
int poplen;
PRINTF("buf_pop len %d (%d)\n", len, buf->ptr);
poplen = MIN(len, buf->ptr);
memcpy(&buf->bufmem[0], &buf->bufmem[poplen], buf->ptr - poplen);
buf->ptr -= poplen;
}
/*---------------------------------------------------------------------------*/
static int
buf_len(struct telnetd_buf *buf)
{
return buf->ptr;
}
/*---------------------------------------------------------------------------*/
void
telnetd_quit(void)
{
shell_quit();
#if TELNETD_CONF_GUI
telnetd_gui_quit();
#endif /* TELNETD_CONF_GUI */
process_exit(&telnetd_process);
LOADER_UNLOAD();
}
/*---------------------------------------------------------------------------*/
void
shell_prompt(char *str)
{
buf_append(&buf, str, (int)strlen(str));
}
/*---------------------------------------------------------------------------*/
void
shell_default_output(const char *str1, int len1, const char *str2, int len2)
{
if(len1 > 0 && str1[len1 - 1] == '\n') {
--len1;
}
if(len2 > 0 && str2[len2 - 1] == '\n') {
--len2;
}
/* PRINTF("shell_default_output: %.*s %.*s\n", len1, str1, len2, str2);*/
#if TELNETD_CONF_GUI
telnetd_gui_output(str1, len1, str2, len2);
#endif /* TELNETD_CONF_GUI */
buf_append(&buf, str1, len1);
buf_append(&buf, str2, len2);
buf_append(&buf, "\r\n", 2);
}
/*---------------------------------------------------------------------------*/
void
shell_exit(void)
{
s.state = STATE_CLOSE;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(telnetd_process, ev, data)
{
PROCESS_BEGIN();
shell_init();
#if TELNETD_CONF_GUI
telnetd_gui_init();
#endif /* TELNETD_CONF_GUI */
petsciiconv_toascii(telnetd_reject_text, strlen(telnetd_reject_text));
tcp_listen(UIP_HTONS(23));
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)
{
buf_pop(&buf, s.numsent);
}
/*---------------------------------------------------------------------------*/
static void
senddata(void)
{
int len;
len = MIN(buf_len(&buf), uip_mss());
PRINTF("senddata len %d\n", len);
buf_copyto(&buf, uip_appdata, len);
uip_send(uip_appdata, len);
s.numsent = len;
}
/*---------------------------------------------------------------------------*/
static void
get_char(uint8_t c)
{
PRINTF("telnetd: get_char '%c' %d %d\n", c, c, s.bufptr);
if(c == 0) {
return;
}
if(c != ISO_nl && c != ISO_cr) {
s.buf[(int)s.bufptr] = c;
++s.bufptr;
}
if(((c == ISO_nl || c == ISO_cr) && s.bufptr > 0) ||
s.bufptr == sizeof(s.buf)) {
if(s.bufptr < sizeof(s.buf)) {
s.buf[(int)s.bufptr] = 0;
}
petsciiconv_topetscii(s.buf, TELNETD_CONF_LINELEN);
PRINTF("telnetd: get_char '%.*s'\n", s.bufptr, s.buf);
shell_input(s.buf, s.bufptr);
s.bufptr = 0;
}
}
/*---------------------------------------------------------------------------*/
static void
sendopt(uint8_t option, uint8_t value)
{
char line[4];
line[0] = (char)TELNET_IAC;
line[1] = option;
line[2] = value;
line[3] = 0;
petsciiconv_topetscii(line, 4);
buf_append(&buf, line, 4);
}
/*---------------------------------------------------------------------------*/
static void
newdata(void)
{
uint16_t len;
uint8_t c;
uint8_t *ptr;
len = uip_datalen();
PRINTF("newdata len %d '%.*s'\n", len, len, (char *)uip_appdata);
ptr = uip_appdata;
while(len > 0 && s.bufptr < sizeof(s.buf)) {
c = *ptr;
PRINTF("newdata char '%c' %d %d state %d\n", c, c, len, s.state);
++ptr;
--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)
{
if(uip_connected()) {
if(!connected) {
buf_init(&buf);
s.bufptr = 0;
s.state = STATE_NORMAL;
connected = 1;
shell_start();
#if TELNETD_CONF_MAX_IDLE_TIME
timer_set(&s.silence_timer, TELNETD_CONF_MAX_IDLE_TIME);
#endif /* TELNETD_CONF_MAX_IDLE_TIME */
ts = (char *)0;
} else {
uip_send(telnetd_reject_text, strlen(telnetd_reject_text));
ts = (char *)1;
}
tcp_markconn(uip_conn, ts);
}
if(!ts) {
if(s.state == STATE_CLOSE) {
s.state = STATE_NORMAL;
uip_close();
return;
}
if(uip_closed() ||
uip_aborted() ||
uip_timedout()) {
shell_stop();
connected = 0;
}
if(uip_acked()) {
#if TELNETD_CONF_MAX_IDLE_TIME
timer_set(&s.silence_timer, TELNETD_CONF_MAX_IDLE_TIME);
#endif /* TELNETD_CONF_MAX_IDLE_TIME */
acked();
}
if(uip_newdata()) {
#if TELNETD_CONF_MAX_IDLE_TIME
timer_set(&s.silence_timer, TELNETD_CONF_MAX_IDLE_TIME);
#endif /* TELNETD_CONF_MAX_IDLE_TIME */
newdata();
}
if(uip_rexmit() ||
uip_newdata() ||
uip_acked() ||
uip_connected() ||
uip_poll()) {
senddata();
#if TELNETD_CONF_MAX_IDLE_TIME
if(s.numsent > 0) {
timer_set(&s.silence_timer, TELNETD_CONF_MAX_IDLE_TIME);
}
#endif /* TELNETD_CONF_MAX_IDLE_TIME */
}
#if TELNETD_CONF_MAX_IDLE_TIME
if(uip_poll()) {
if(timer_expired(&s.silence_timer)) {
uip_close();
tcp_markconn(uip_conn, NULL);
}
}
#endif /* TELNETD_CONF_MAX_IDLE_TIME */
}
}
/*---------------------------------------------------------------------------*/
void
telnetd_init(void)
{
process_start(&telnetd_process, NULL);
}
/*---------------------------------------------------------------------------*/
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