sshtty.c revision 162852 
1/* $OpenBSD: sshtty.c,v 1.12 2006/08/03 03:34:42 deraadt Exp $ */
2/*
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 *                    All rights reserved
6 *
7 * As far as I am concerned, the code I have written for this software
8 * can be used freely for any purpose.  Any derived versions of this
9 * software must be clearly marked as such, and if the derived work is
10 * incompatible with the protocol description in the RFC file, it must be
11 * called by a name other than "ssh" or "Secure Shell".
12 */
13/*
14 * Copyright (c) 2001 Markus Friedl.  All rights reserved.
15 * Copyright (c) 2001 Kevin Steves.  All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 *    notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 *    notice, this list of conditions and the following disclaimer in the
24 *    documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include "includes.h"
39
40#include <sys/types.h>
41#include <stdio.h>
42#include <termios.h>
43#include <pwd.h>
44
45#include "sshpty.h"
46
47static struct termios _saved_tio;
48static int _in_raw_mode = 0;
49
50struct termios
51get_saved_tio(void)
52{
53	return _saved_tio;
54}
55
56void
57leave_raw_mode(void)
58{
59	if (!_in_raw_mode)
60		return;
61	if (tcsetattr(fileno(stdin), TCSADRAIN, &_saved_tio) == -1)
62		perror("tcsetattr");
63	else
64		_in_raw_mode = 0;
65}
66
67void
68enter_raw_mode(void)
69{
70	struct termios tio;
71
72	if (tcgetattr(fileno(stdin), &tio) == -1) {
73		perror("tcgetattr");
74		return;
75	}
76	_saved_tio = tio;
77	tio.c_iflag |= IGNPAR;
78	tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
79#ifdef IUCLC
80	tio.c_iflag &= ~IUCLC;
81#endif
82	tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
83#ifdef IEXTEN
84	tio.c_lflag &= ~IEXTEN;
85#endif
86	tio.c_oflag &= ~OPOST;
87	tio.c_cc[VMIN] = 1;
88	tio.c_cc[VTIME] = 0;
89	if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) == -1)
90		perror("tcsetattr");
91	else
92		_in_raw_mode = 1;
93}
94