| /* |
| * Copyright (c) 2002, 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 uIP TCP/IP stack. |
| * |
| * $Id: telnet.c,v 1.5 2004/07/04 11:35:08 adamdunkels Exp $ |
| * |
| */ |
| |
| #include "tcpip.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, u16_t len) |
| { |
| if(s->text != NULL) { |
| return 1; |
| } |
| s->text = text; |
| 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 |
| 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 |
| 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); |
| } |
| /*-----------------------------------------------------------------------------------*/ |
| 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); |
| } else if(uip_poll()) { |
| senddata(s); |
| } |
| } |
| /*-----------------------------------------------------------------------------------*/ |