crypto/external/bsd/openssh/dist/sshtty.c

   1 /*      $NetBSD$        */
   2 /* $OpenBSD: sshtty.c,v 1.13 2008/05/19 15:45:07 djm Exp $ */
   3 /*
   4  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   5  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   6  *                    All rights reserved
   7  *
   8  * As far as I am concerned, the code I have written for this software
   9  * can be used freely for any purpose.  Any derived versions of this
  10  * software must be clearly marked as such, and if the derived work is
  11  * incompatible with the protocol description in the RFC file, it must be
  12  * called by a name other than "ssh" or "Secure Shell".
  13  */
  14 /*
  15  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
  16  * Copyright (c) 2001 Kevin Steves.  All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions
  20  * are met:
  21  * 1. Redistributions of source code must retain the above copyright
  22  *    notice, this list of conditions and the following disclaimer.
  23  * 2. Redistributions in binary form must reproduce the above copyright
  24  *    notice, this list of conditions and the following disclaimer in the
  25  *    documentation and/or other materials provided with the distribution.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  28  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  29  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  30  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  31  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  32  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  33  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  34  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  35  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  36  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 #include "includes.h"
  40 __RCSID("$NetBSD: sshtty.c,v 1.5 2009/02/16 20:53:55 christos Exp $");
  41 #include <sys/types.h>
  42 #include <stdio.h>
  43 #include <termios.h>
  44 #include <pwd.h>
  45
  46 #include "sshpty.h"
  47
  48 static struct termios _saved_tio;
  49 static int _in_raw_mode = 0;
  50
  51 struct termios *
  52 get_saved_tio(void)
  53 {
  54         return _in_raw_mode ? &_saved_tio : NULL;
  55 }
  56
  57 void
  58 leave_raw_mode(void)
  59 {
  60         if (!_in_raw_mode)
  61                 return;
  62         if (tcsetattr(fileno(stdin), TCSADRAIN, &_saved_tio) == -1)
  63                 perror("tcsetattr");
  64         else
  65                 _in_raw_mode = 0;
  66 }
  67
  68 void
  69 enter_raw_mode(void)
  70 {
  71         struct termios tio;
  72
  73         if (tcgetattr(fileno(stdin), &tio) == -1) {
  74                 perror("tcgetattr");
  75                 return;
  76         }
  77         _saved_tio = tio;
  78         tio.c_iflag |= IGNPAR;
  79         tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
  80 #ifdef IUCLC
  81         tio.c_iflag &= ~IUCLC;
  82 #endif
  83         tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
  84 #ifdef IEXTEN
  85         tio.c_lflag &= ~IEXTEN;
  86 #endif
  87         tio.c_oflag &= ~OPOST;
  88         tio.c_cc[VMIN] = 1;
  89         tio.c_cc[VTIME] = 0;
  90         if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) == -1)
  91                 perror("tcsetattr");
  92         else
  93                 _in_raw_mode = 1;
  94 }