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      1 /* $OpenBSD: sshtty.c,v 1.14 2010/01/09 05:04:24 djm Exp $ */
      2 /*
      3  * Author: Tatu Ylonen <ylo (at) cs.hut.fi>
      4  * Copyright (c) 1995 Tatu Ylonen <ylo (at) 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 *
     51 get_saved_tio(void)
     52 {
     53 	return _in_raw_mode ? &_saved_tio : NULL;
     54 }
     55 
     56 void
     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
     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