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457 lines
10 KiB
457 lines
10 KiB
/* $OpenBSD: ttymodes.c,v 1.34 2018/07/09 21:20:26 markus Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*/
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/*
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* SSH2 tty modes support by Kevin Steves.
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* Copyright (c) 2001 Kevin Steves. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Encoding and decoding of terminal modes in a portable way.
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* Much of the format is defined in ttymodes.h; it is included multiple times
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* into this file with the appropriate macro definitions to generate the
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* suitable code.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include <errno.h>
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#include <string.h>
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#include <termios.h>
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#include <stdarg.h>
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#include "packet.h"
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#include "log.h"
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#include "compat.h"
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#include "sshbuf.h"
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#include "ssherr.h"
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#define TTY_OP_END 0
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/*
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* uint32 (u_int) follows speed.
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*/
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#define TTY_OP_ISPEED 128
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#define TTY_OP_OSPEED 129
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/*
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* Converts POSIX speed_t to a baud rate. The values of the
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* constants for speed_t are not themselves portable.
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*/
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static int
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speed_to_baud(speed_t speed)
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{
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switch (speed) {
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case B0:
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return 0;
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case B50:
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return 50;
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case B75:
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return 75;
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case B110:
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return 110;
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case B134:
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return 134;
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case B150:
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return 150;
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case B200:
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return 200;
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case B300:
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return 300;
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case B600:
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return 600;
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case B1200:
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return 1200;
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case B1800:
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return 1800;
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case B2400:
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return 2400;
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case B4800:
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return 4800;
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case B9600:
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return 9600;
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#ifdef B19200
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case B19200:
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return 19200;
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#else /* B19200 */
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#ifdef EXTA
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case EXTA:
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return 19200;
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#endif /* EXTA */
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#endif /* B19200 */
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#ifdef B38400
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case B38400:
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return 38400;
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#else /* B38400 */
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#ifdef EXTB
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case EXTB:
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return 38400;
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#endif /* EXTB */
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#endif /* B38400 */
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#ifdef B7200
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case B7200:
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return 7200;
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#endif /* B7200 */
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#ifdef B14400
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case B14400:
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return 14400;
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#endif /* B14400 */
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#ifdef B28800
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case B28800:
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return 28800;
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#endif /* B28800 */
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#ifdef B57600
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case B57600:
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return 57600;
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#endif /* B57600 */
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#ifdef B76800
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case B76800:
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return 76800;
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#endif /* B76800 */
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#ifdef B115200
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case B115200:
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return 115200;
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#endif /* B115200 */
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#ifdef B230400
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case B230400:
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return 230400;
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#endif /* B230400 */
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default:
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return 9600;
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}
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}
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/*
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* Converts a numeric baud rate to a POSIX speed_t.
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*/
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static speed_t
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baud_to_speed(int baud)
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{
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switch (baud) {
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case 0:
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return B0;
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case 50:
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return B50;
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case 75:
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return B75;
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case 110:
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return B110;
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case 134:
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return B134;
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case 150:
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return B150;
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case 200:
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return B200;
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case 300:
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return B300;
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case 600:
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return B600;
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case 1200:
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return B1200;
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case 1800:
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return B1800;
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case 2400:
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return B2400;
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case 4800:
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return B4800;
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case 9600:
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return B9600;
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#ifdef B19200
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case 19200:
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return B19200;
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#else /* B19200 */
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#ifdef EXTA
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case 19200:
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return EXTA;
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#endif /* EXTA */
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#endif /* B19200 */
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#ifdef B38400
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case 38400:
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return B38400;
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#else /* B38400 */
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#ifdef EXTB
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case 38400:
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return EXTB;
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#endif /* EXTB */
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#endif /* B38400 */
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#ifdef B7200
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case 7200:
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return B7200;
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#endif /* B7200 */
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#ifdef B14400
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case 14400:
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return B14400;
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#endif /* B14400 */
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#ifdef B28800
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case 28800:
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return B28800;
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#endif /* B28800 */
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#ifdef B57600
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case 57600:
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return B57600;
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#endif /* B57600 */
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#ifdef B76800
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case 76800:
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return B76800;
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#endif /* B76800 */
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#ifdef B115200
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case 115200:
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return B115200;
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#endif /* B115200 */
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#ifdef B230400
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case 230400:
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return B230400;
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#endif /* B230400 */
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default:
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return B9600;
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}
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}
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/*
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* Encode a special character into SSH line format.
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*/
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static u_int
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special_char_encode(cc_t c)
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{
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#ifdef _POSIX_VDISABLE
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if (c == _POSIX_VDISABLE)
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return 255;
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#endif /* _POSIX_VDISABLE */
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return c;
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}
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/*
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* Decode a special character from SSH line format.
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*/
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static cc_t
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special_char_decode(u_int c)
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{
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#ifdef _POSIX_VDISABLE
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if (c == 255)
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return _POSIX_VDISABLE;
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#endif /* _POSIX_VDISABLE */
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return c;
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}
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/*
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* Encodes terminal modes for the terminal referenced by fd
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* or tiop in a portable manner, and appends the modes to a packet
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* being constructed.
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*/
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void
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ssh_tty_make_modes(struct ssh *ssh, int fd, struct termios *tiop)
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{
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struct termios tio;
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struct sshbuf *buf;
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int r, ibaud, obaud;
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if ((buf = sshbuf_new()) == NULL)
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fatal("%s: sshbuf_new failed", __func__);
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if (tiop == NULL) {
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if (fd == -1) {
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debug("%s: no fd or tio", __func__);
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goto end;
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}
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if (tcgetattr(fd, &tio) == -1) {
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logit("tcgetattr: %.100s", strerror(errno));
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goto end;
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}
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} else
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tio = *tiop;
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/* Store input and output baud rates. */
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obaud = speed_to_baud(cfgetospeed(&tio));
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ibaud = speed_to_baud(cfgetispeed(&tio));
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if ((r = sshbuf_put_u8(buf, TTY_OP_OSPEED)) != 0 ||
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(r = sshbuf_put_u32(buf, obaud)) != 0 ||
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(r = sshbuf_put_u8(buf, TTY_OP_ISPEED)) != 0 ||
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(r = sshbuf_put_u32(buf, ibaud)) != 0)
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fatal("%s: buffer error: %s", __func__, ssh_err(r));
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/* Store values of mode flags. */
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#define TTYCHAR(NAME, OP) \
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if ((r = sshbuf_put_u8(buf, OP)) != 0 || \
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(r = sshbuf_put_u32(buf, \
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special_char_encode(tio.c_cc[NAME]))) != 0) \
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fatal("%s: buffer error: %s", __func__, ssh_err(r)); \
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#define SSH_TTYMODE_IUTF8 42 /* for SSH_BUG_UTF8TTYMODE */
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#define TTYMODE(NAME, FIELD, OP) \
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if (OP == SSH_TTYMODE_IUTF8 && (datafellows & SSH_BUG_UTF8TTYMODE)) { \
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debug3("%s: SSH_BUG_UTF8TTYMODE", __func__); \
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} else if ((r = sshbuf_put_u8(buf, OP)) != 0 || \
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(r = sshbuf_put_u32(buf, ((tio.FIELD & NAME) != 0))) != 0) \
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fatal("%s: buffer error: %s", __func__, ssh_err(r)); \
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#include "ttymodes.h"
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#undef TTYCHAR
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#undef TTYMODE
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end:
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/* Mark end of mode data. */
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if ((r = sshbuf_put_u8(buf, TTY_OP_END)) != 0 ||
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(r = sshpkt_put_stringb(ssh, buf)) != 0)
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fatal("%s: packet error: %s", __func__, ssh_err(r));
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sshbuf_free(buf);
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}
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/*
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* Decodes terminal modes for the terminal referenced by fd in a portable
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* manner from a packet being read.
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*/
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void
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ssh_tty_parse_modes(struct ssh *ssh, int fd)
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{
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struct termios tio;
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struct sshbuf *buf;
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const u_char *data;
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u_char opcode;
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u_int baud, u;
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int r, failure = 0;
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size_t len;
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if ((r = sshpkt_get_string_direct(ssh, &data, &len)) != 0)
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fatal("%s: packet error: %s", __func__, ssh_err(r));
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if (len == 0)
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return;
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if ((buf = sshbuf_from(data, len)) == NULL) {
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error("%s: sshbuf_from failed", __func__);
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return;
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}
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/*
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* Get old attributes for the terminal. We will modify these
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* flags. I am hoping that if there are any machine-specific
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* modes, they will initially have reasonable values.
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*/
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if (tcgetattr(fd, &tio) == -1) {
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logit("tcgetattr: %.100s", strerror(errno));
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failure = -1;
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}
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while (sshbuf_len(buf) > 0) {
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if ((r = sshbuf_get_u8(buf, &opcode)) != 0)
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fatal("%s: packet error: %s", __func__, ssh_err(r));
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switch (opcode) {
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case TTY_OP_END:
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goto set;
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case TTY_OP_ISPEED:
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if ((r = sshbuf_get_u32(buf, &baud)) != 0)
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fatal("%s: packet error: %s",
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__func__, ssh_err(r));
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if (failure != -1 &&
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cfsetispeed(&tio, baud_to_speed(baud)) == -1)
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error("cfsetispeed failed for %d", baud);
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break;
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case TTY_OP_OSPEED:
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if ((r = sshbuf_get_u32(buf, &baud)) != 0)
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fatal("%s: packet error: %s",
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__func__, ssh_err(r));
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if (failure != -1 &&
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cfsetospeed(&tio, baud_to_speed(baud)) == -1)
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error("cfsetospeed failed for %d", baud);
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break;
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#define TTYCHAR(NAME, OP) \
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case OP: \
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if ((r = sshbuf_get_u32(buf, &u)) != 0) \
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fatal("%s: packet error: %s", __func__, \
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ssh_err(r)); \
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tio.c_cc[NAME] = special_char_decode(u); \
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break;
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#define TTYMODE(NAME, FIELD, OP) \
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case OP: \
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if ((r = sshbuf_get_u32(buf, &u)) != 0) \
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fatal("%s: packet error: %s", __func__, \
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ssh_err(r)); \
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if (u) \
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tio.FIELD |= NAME; \
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else \
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tio.FIELD &= ~NAME; \
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break;
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#include "ttymodes.h"
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#undef TTYCHAR
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#undef TTYMODE
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default:
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debug("Ignoring unsupported tty mode opcode %d (0x%x)",
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opcode, opcode);
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/*
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* SSH2:
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* Opcodes 1 to 159 are defined to have a uint32
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* argument.
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* Opcodes 160 to 255 are undefined and cause parsing
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* to stop.
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*/
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if (opcode > 0 && opcode < 160) {
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if ((r = sshbuf_get_u32(buf, NULL)) != 0)
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fatal("%s: packet error: %s", __func__,
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ssh_err(r));
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break;
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} else {
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logit("%s: unknown opcode %d", __func__,
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opcode);
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goto set;
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}
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}
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}
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set:
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len = sshbuf_len(buf);
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sshbuf_free(buf);
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if (len > 0) {
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logit("%s: %zu bytes left", __func__, len);
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return; /* Don't process bytes passed */
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}
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if (failure == -1)
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return; /* Packet parsed ok but tcgetattr() failed */
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/* Set the new modes for the terminal. */
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if (tcsetattr(fd, TCSANOW, &tio) == -1)
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logit("Setting tty modes failed: %.100s", strerror(errno));
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}
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