sshtty.c

   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 *
  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 }