xref: /openssh-portable/sshtty.c (revision 37c1b3d6)
1 /* $OpenBSD: sshtty.c,v 1.14 2010/01/09 05:04:24 djm 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 
47 static struct termios _saved_tio;
48 static int _in_raw_mode = 0;
49 
50 struct termios *
get_saved_tio(void)51 get_saved_tio(void)
52 {
53 	return _in_raw_mode ? &_saved_tio : NULL;
54 }
55 
56 void
leave_raw_mode(int quiet)57 leave_raw_mode(int quiet)
58 {
59 	if (!_in_raw_mode)
60 		return;
61 	if (tcsetattr(fileno(stdin), TCSADRAIN, &_saved_tio) == -1) {
62 		if (!quiet)
63 			perror("tcsetattr");
64 	} else
65 		_in_raw_mode = 0;
66 }
67 
68 void
enter_raw_mode(int quiet)69 enter_raw_mode(int quiet)
70 {
71 	struct termios tio;
72 
73 	if (tcgetattr(fileno(stdin), &tio) == -1) {
74 		if (!quiet)
75 			perror("tcgetattr");
76 		return;
77 	}
78 	_saved_tio = tio;
79 	tio.c_iflag |= IGNPAR;
80 	tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
81 #ifdef IUCLC
82 	tio.c_iflag &= ~IUCLC;
83 #endif
84 	tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
85 #ifdef IEXTEN
86 	tio.c_lflag &= ~IEXTEN;
87 #endif
88 	tio.c_oflag &= ~OPOST;
89 	tio.c_cc[VMIN] = 1;
90 	tio.c_cc[VTIME] = 0;
91 	if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) == -1) {
92 		if (!quiet)
93 			perror("tcsetattr");
94 	} else
95 		_in_raw_mode = 1;
96 }
97