nes-proj/apps/telnet/telnet.c

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/*
* Copyright (c) 2002, Adam Dunkels.
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* All rights reserved.
*
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* 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
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* 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
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This file is part of the uIP TCP/IP stack.
*
* $Id: telnet.c,v 1.3 2010/10/19 18:29:03 adamdunkels Exp $
*
*/
#include "contiki-net.h"
#include "telnet.h"
#ifndef NULL
#define NULL (void *)0
#endif /* NULL */
#define FLAG_CLOSE 1
#define FLAG_ABORT 2
/*-----------------------------------------------------------------------------------*/
unsigned char
telnet_send(struct telnet_state *s, char *text, uint16_t len)
{
if(s->text != NULL) {
return 1;
}
s->text = text;
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s->textlen = len;
s->sentlen = 0;
return 0;
}
/*-----------------------------------------------------------------------------------*/
unsigned char
telnet_close(struct telnet_state *s)
{
s->flags = FLAG_CLOSE;
if(s->text != NULL) {
return 1;
}
return 0;
}
/*-----------------------------------------------------------------------------------*/
unsigned char
telnet_abort(struct telnet_state *s)
{
s->flags = FLAG_ABORT;
if(s->text != NULL) {
return 1;
}
return 0;
}
/*-----------------------------------------------------------------------------------*/
static void
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acked(struct telnet_state *s)
{
s->textlen -= s->sentlen;
if(s->textlen == 0) {
s->text = NULL;
telnet_sent(s);
} else {
s->text += s->sentlen;
}
s->sentlen = 0;
}
/*-----------------------------------------------------------------------------------*/
static void
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senddata(struct telnet_state *s)
{
if(s->text == NULL) {
uip_send(s->text, 0);
return;
}
if(s->textlen > uip_mss()) {
s->sentlen = uip_mss();
} else {
s->sentlen = s->textlen;
}
uip_send(s->text, s->sentlen);
}
/*-----------------------------------------------------------------------------------*/
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struct telnet_state *
telnet_connect(struct telnet_state *s, uip_ipaddr_t *addr, uint16_t port)
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{
struct uip_conn *conn;
conn = tcp_connect(addr, uip_htons(port), s);
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if(conn == NULL) {
return NULL;
}
return s;
}
/*-----------------------------------------------------------------------------------*/
void
telnet_app(void *ts)
{
struct telnet_state *s = (struct telnet_state *)ts;
if(uip_connected()) {
s->flags = 0;
telnet_connected(s);
senddata(s);
return;
}
if(uip_closed()) {
telnet_closed(s);
}
if(uip_aborted()) {
telnet_aborted(s);
}
if(uip_timedout()) {
telnet_timedout(s);
}
if(s->flags & FLAG_CLOSE) {
uip_close();
return;
}
if(s->flags & FLAG_ABORT) {
uip_abort();
return;
}
if(uip_acked()) {
acked(s);
}
if(uip_newdata()) {
telnet_newdata(s, (char *)uip_appdata, uip_datalen());
}
if(uip_rexmit() ||
uip_newdata() ||
uip_acked()) {
senddata(s);
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} else if(uip_poll()) {
senddata(s);
}
}
/*-----------------------------------------------------------------------------------*/