405 lines
9.7 KiB
C
405 lines
9.7 KiB
C
/*
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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 Contiki desktop OS.
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*
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* $Id: telnetd.c,v 1.14 2010/10/19 18:29:03 adamdunkels Exp $
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*
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*/
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#include <string.h>
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#include "contiki-lib.h"
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#include "contiki-net.h"
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#include "lib/petsciiconv.h"
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#include "shell.h"
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#include "telnetd.h"
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#define ISO_nl 0x0a
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#define ISO_cr 0x0d
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PROCESS(telnetd_process, "Telnet server");
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AUTOSTART_PROCESSES(&telnetd_process);
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#ifndef TELNETD_CONF_LINELEN
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#define TELNETD_CONF_LINELEN 80
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#endif
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#ifndef TELNETD_CONF_NUMLINES
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#define TELNETD_CONF_NUMLINES 25
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#endif
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#ifdef TELNETD_CONF_REJECT
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extern char telnetd_reject_text[];
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#else
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static char telnetd_reject_text[] =
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"Too many connections, please try again later.";
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#endif
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struct telnetd_state {
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char buf[TELNETD_CONF_LINELEN + 1];
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char bufptr;
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uint16_t numsent;
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u8_t state;
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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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};
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static struct telnetd_state s;
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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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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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struct telnetd_buf {
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char bufmem[TELNETD_CONF_NUMLINES * TELNETD_CONF_LINELEN];
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int ptr;
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int size;
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};
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static struct telnetd_buf buf;
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static uint8_t connected;
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#define MIN(a, b) ((a) < (b)? (a): (b))
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/*---------------------------------------------------------------------------*/
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static void
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buf_init(struct telnetd_buf *buf)
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{
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buf->ptr = 0;
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buf->size = TELNETD_CONF_NUMLINES * TELNETD_CONF_LINELEN;
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}
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/*---------------------------------------------------------------------------*/
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static int
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buf_append(struct telnetd_buf *buf, const char *data, int len)
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{
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int copylen;
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PRINTF("buf_append len %d (%d) '%.*s'\n", len, buf->ptr, len, data);
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copylen = MIN(len, buf->size - buf->ptr);
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memcpy(&buf->bufmem[buf->ptr], data, copylen);
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petsciiconv_toascii(&buf->bufmem[buf->ptr], copylen);
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buf->ptr += copylen;
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return copylen;
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}
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/*---------------------------------------------------------------------------*/
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static void
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buf_copyto(struct telnetd_buf *buf, char *to, int len)
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{
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memcpy(to, &buf->bufmem[0], len);
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}
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/*---------------------------------------------------------------------------*/
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static void
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buf_pop(struct telnetd_buf *buf, int len)
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{
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int poplen;
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PRINTF("buf_pop len %d (%d)\n", len, buf->ptr);
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poplen = MIN(len, buf->ptr);
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memcpy(&buf->bufmem[0], &buf->bufmem[poplen], buf->ptr - poplen);
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buf->ptr -= poplen;
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}
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/*---------------------------------------------------------------------------*/
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static int
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buf_len(struct telnetd_buf *buf)
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{
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return buf->ptr;
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}
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/*---------------------------------------------------------------------------*/
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void
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telnetd_quit(void)
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{
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shell_quit();
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#if TELNETD_CONF_GUI
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telnetd_gui_quit();
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#endif /* TELNETD_CONF_GUI */
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process_exit(&telnetd_process);
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LOADER_UNLOAD();
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_prompt(char *str)
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{
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buf_append(&buf, str, (int)strlen(str));
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_default_output(const char *str1, int len1, const char *str2, int len2)
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{
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if(len1 > 0 && str1[len1 - 1] == '\n') {
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--len1;
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}
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if(len2 > 0 && str2[len2 - 1] == '\n') {
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--len2;
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}
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/* PRINTF("shell_default_output: %.*s %.*s\n", len1, str1, len2, str2);*/
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#if TELNETD_CONF_GUI
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telnetd_gui_output(str1, len1, str2, len2);
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#endif /* TELNETD_CONF_GUI */
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buf_append(&buf, str1, len1);
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buf_append(&buf, str2, len2);
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buf_append(&buf, "\r\n", 2);
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_exit(void)
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{
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s.state = STATE_CLOSE;
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(telnetd_process, ev, data)
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{
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PROCESS_BEGIN();
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shell_init();
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#if TELNETD_CONF_GUI
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telnetd_gui_init();
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#endif /* TELNETD_CONF_GUI */
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petsciiconv_toascii(telnetd_reject_text, strlen(telnetd_reject_text));
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tcp_listen(UIP_HTONS(23));
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while(1) {
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PROCESS_WAIT_EVENT();
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if(ev == tcpip_event) {
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telnetd_appcall(data);
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} else if(ev == PROCESS_EVENT_EXIT) {
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telnetd_quit();
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} else {
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#if TELNETD_CONF_GUI
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telnetd_gui_eventhandler(ev, data);
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#endif /* TELNETD_CONF_GUI */
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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static void
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acked(void)
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{
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buf_pop(&buf, s.numsent);
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}
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/*---------------------------------------------------------------------------*/
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static void
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senddata(void)
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{
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int len;
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len = MIN(buf_len(&buf), uip_mss());
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PRINTF("senddata len %d\n", len);
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buf_copyto(&buf, uip_appdata, len);
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uip_send(uip_appdata, len);
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s.numsent = len;
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}
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/*---------------------------------------------------------------------------*/
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static void
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get_char(u8_t c)
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{
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PRINTF("telnetd: get_char '%c' %d %d\n", c, c, s.bufptr);
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if(c == 0) {
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return;
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}
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if(c != ISO_nl && c != ISO_cr) {
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s.buf[(int)s.bufptr] = c;
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++s.bufptr;
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}
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if(((c == ISO_nl || c == ISO_cr) && s.bufptr > 0) ||
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s.bufptr == sizeof(s.buf)) {
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if(s.bufptr < sizeof(s.buf)) {
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s.buf[(int)s.bufptr] = 0;
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}
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petsciiconv_topetscii(s.buf, TELNETD_CONF_LINELEN);
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PRINTF("telnetd: get_char '%.*s'\n", s.bufptr, s.buf);
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shell_input(s.buf, s.bufptr);
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s.bufptr = 0;
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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sendopt(u8_t option, u8_t value)
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{
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char line[4];
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line[0] = (char)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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petsciiconv_topetscii(line, 4);
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buf_append(&buf, line, 4);
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}
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/*---------------------------------------------------------------------------*/
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static void
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newdata(void)
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{
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u16_t len;
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u8_t c;
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uint8_t *ptr;
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len = uip_datalen();
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PRINTF("newdata len %d '%.*s'\n", len, len, (char *)uip_appdata);
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ptr = uip_appdata;
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while(len > 0 && s.bufptr < sizeof(s.buf)) {
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c = *ptr;
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PRINTF("newdata char '%c' %d %d state %d\n", c, c, len, s.state);
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++ptr;
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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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get_char(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(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(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(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(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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get_char(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_appcall(void *ts)
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{
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if(uip_connected()) {
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if(!connected) {
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buf_init(&buf);
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s.bufptr = 0;
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s.state = STATE_NORMAL;
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connected = 1;
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shell_start();
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ts = (char *)0;
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} else {
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uip_send(telnetd_reject_text, strlen(telnetd_reject_text));
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ts = (char *)1;
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}
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tcp_markconn(uip_conn, ts);
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}
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if(!ts) {
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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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uip_aborted() ||
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uip_timedout()) {
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shell_stop();
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connected = 0;
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}
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if(uip_acked()) {
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acked();
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}
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if(uip_newdata()) {
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newdata();
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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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uip_connected() ||
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uip_poll()) {
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senddata();
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}
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} else {
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if(uip_poll()) {
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if(ts == (char *)10) {
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uip_close();
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} else {
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tcp_markconn(uip_conn, (char *)ts + 1);
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}
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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