164 lines
4.2 KiB
C
164 lines
4.2 KiB
C
/*
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* Copyright (c) 2002, 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: telnet.c,v 1.3 2010/10/19 18:29:03 adamdunkels Exp $
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*
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*/
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#include "contiki-net.h"
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#include "telnet.h"
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#ifndef NULL
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#define NULL (void *)0
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#endif /* NULL */
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#define FLAG_CLOSE 1
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#define FLAG_ABORT 2
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/*-----------------------------------------------------------------------------------*/
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unsigned char
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telnet_send(struct telnet_state *s, char *text, uint16_t len)
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{
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if(s->text != NULL) {
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return 1;
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}
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s->text = text;
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s->textlen = len;
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s->sentlen = 0;
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return 0;
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}
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/*-----------------------------------------------------------------------------------*/
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unsigned char
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telnet_close(struct telnet_state *s)
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{
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s->flags = FLAG_CLOSE;
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if(s->text != NULL) {
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return 1;
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}
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return 0;
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}
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/*-----------------------------------------------------------------------------------*/
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unsigned char
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telnet_abort(struct telnet_state *s)
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{
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s->flags = FLAG_ABORT;
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if(s->text != NULL) {
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return 1;
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}
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return 0;
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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acked(struct telnet_state *s)
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{
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s->textlen -= s->sentlen;
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if(s->textlen == 0) {
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s->text = NULL;
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telnet_sent(s);
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} else {
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s->text += s->sentlen;
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}
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s->sentlen = 0;
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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senddata(struct telnet_state *s)
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{
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if(s->text == NULL) {
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uip_send(s->text, 0);
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return;
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}
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if(s->textlen > uip_mss()) {
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s->sentlen = uip_mss();
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} else {
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s->sentlen = s->textlen;
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}
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uip_send(s->text, s->sentlen);
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}
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/*-----------------------------------------------------------------------------------*/
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struct telnet_state *
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telnet_connect(struct telnet_state *s, uip_ipaddr_t *addr, uint16_t port)
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{
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struct uip_conn *conn;
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conn = tcp_connect(addr, uip_htons(port), s);
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if(conn == NULL) {
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return NULL;
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}
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return s;
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}
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/*-----------------------------------------------------------------------------------*/
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void
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telnet_app(void *ts)
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{
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struct telnet_state *s = (struct telnet_state *)ts;
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if(uip_connected()) {
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s->flags = 0;
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telnet_connected(s);
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senddata(s);
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return;
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}
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if(uip_closed()) {
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telnet_closed(s);
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}
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if(uip_aborted()) {
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telnet_aborted(s);
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}
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if(uip_timedout()) {
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telnet_timedout(s);
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}
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if(s->flags & FLAG_CLOSE) {
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uip_close();
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return;
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}
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if(s->flags & FLAG_ABORT) {
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uip_abort();
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return;
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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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telnet_newdata(s, (char *)uip_appdata, uip_datalen());
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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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