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      1 /*
      2  * Author: Tatu Ylonen <ylo (at) cs.hut.fi>
      3  * Copyright (c) 1995 Tatu Ylonen <ylo (at) cs.hut.fi>, Espoo, Finland
      4  *                    All rights reserved
      5  *
      6  * As far as I am concerned, the code I have written for this software
      7  * can be used freely for any purpose.  Any derived versions of this
      8  * software must be clearly marked as such, and if the derived work is
      9  * incompatible with the protocol description in the RFC file, it must be
     10  * called by a name other than "ssh" or "Secure Shell".
     11  */
     12 /*
     13  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
     14  * Copyright (c) 2001 Kevin Steves.  All rights reserved.
     15  *
     16  * Redistribution and use in source and binary forms, with or without
     17  * modification, are permitted provided that the following conditions
     18  * are met:
     19  * 1. Redistributions of source code must retain the above copyright
     20  *    notice, this list of conditions and the following disclaimer.
     21  * 2. Redistributions in binary form must reproduce the above copyright
     22  *    notice, this list of conditions and the following disclaimer in the
     23  *    documentation and/or other materials provided with the distribution.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     26  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     28  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     31  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     34  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     35  */
     36 
     37 #include "includes.h"
     38 RCSID("$OpenBSD: sshtty.c,v 1.3 2002/03/04 17:27:39 stevesk Exp $");
     39 
     40 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     41 
     42 #include "sshtty.h"
     43 #include "log.h"
     44 
     45 static struct termios _saved_tio;
     46 static int _in_raw_mode = 0;
     47 
     48 int
     49 in_raw_mode(void)
     50 {
     51 	return _in_raw_mode;
     52 }
     53 
     54 struct termios
     55 get_saved_tio(void)
     56 {
     57 	return _saved_tio;
     58 }
     59 
     60 void
     61 leave_raw_mode(void)
     62 {
     63 	if (!_in_raw_mode)
     64 		return;
     65 	if (tcsetattr(fileno(stdin), TCSADRAIN, &_saved_tio) == -1)
     66 		perror("tcsetattr");
     67 	else
     68 		_in_raw_mode = 0;
     69 
     70 	fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL);
     71 }
     72 
     73 void
     74 enter_raw_mode(void)
     75 {
     76 	struct termios tio;
     77 
     78 	if (tcgetattr(fileno(stdin), &tio) == -1) {
     79 		perror("tcgetattr");
     80 		return;
     81 	}
     82 	_saved_tio = tio;
     83 	tio.c_iflag |= IGNPAR;
     84 	tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
     85 	tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
     86 #ifdef IEXTEN
     87 	tio.c_lflag &= ~IEXTEN;
     88 #endif
     89 	tio.c_oflag &= ~OPOST;
     90 	tio.c_cc[VMIN] = 1;
     91 	tio.c_cc[VTIME] = 0;
     92 	if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) == -1)
     93 		perror("tcsetattr");
     94 	else
     95 		_in_raw_mode = 1;
     96 
     97 	fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL);
     98 }
     99