365 lines
7.1 KiB
C
365 lines
7.1 KiB
C
/*
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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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* 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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* 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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#include "includes.h"
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RCSID("$OpenBSD: ttymodes.c,v 1.8 2000/09/07 20:27:55 deraadt Exp $");
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#include "packet.h"
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#include "ssh.h"
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#define TTY_OP_END 0
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#define TTY_OP_ISPEED 192 /* int follows */
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#define TTY_OP_OSPEED 193 /* int follows */
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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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* Encodes terminal modes for the terminal referenced by fd
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* 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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tty_make_modes(int fd)
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{
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struct termios tio;
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int baud;
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if (tcgetattr(fd, &tio) < 0) {
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packet_put_char(TTY_OP_END);
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log("tcgetattr: %.100s", strerror(errno));
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return;
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}
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/* Store input and output baud rates. */
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baud = speed_to_baud(cfgetospeed(&tio));
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packet_put_char(TTY_OP_OSPEED);
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packet_put_int(baud);
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baud = speed_to_baud(cfgetispeed(&tio));
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packet_put_char(TTY_OP_ISPEED);
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packet_put_int(baud);
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/* Store values of mode flags. */
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#define TTYCHAR(NAME, OP) \
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packet_put_char(OP); packet_put_char(tio.c_cc[NAME]);
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#define TTYMODE(NAME, FIELD, OP) \
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packet_put_char(OP); packet_put_char((tio.FIELD & NAME) != 0);
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#define SGTTYCHAR(NAME, OP)
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#define SGTTYMODE(NAME, FIELD, OP)
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#define SGTTYMODEN(NAME, FIELD, OP)
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#include "ttymodes.h"
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#undef TTYCHAR
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#undef TTYMODE
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#undef SGTTYCHAR
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#undef SGTTYMODE
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#undef SGTTYMODEN
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/* Mark end of mode data. */
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packet_put_char(TTY_OP_END);
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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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tty_parse_modes(int fd, int *n_bytes_ptr)
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{
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struct termios tio;
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int opcode, baud;
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int n_bytes = 0;
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int failure = 0;
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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) < 0)
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failure = -1;
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for (;;) {
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n_bytes += 1;
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opcode = packet_get_char();
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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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n_bytes += 4;
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baud = packet_get_int();
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if (failure != -1 && cfsetispeed(&tio, baud_to_speed(baud)) < 0)
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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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n_bytes += 4;
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baud = packet_get_int();
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if (failure != -1 && cfsetospeed(&tio, baud_to_speed(baud)) < 0)
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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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n_bytes += 1; \
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tio.c_cc[NAME] = packet_get_char(); \
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break;
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#define TTYMODE(NAME, FIELD, OP) \
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case OP: \
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n_bytes += 1; \
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if (packet_get_char()) \
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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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#define SGTTYCHAR(NAME, OP)
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#define SGTTYMODE(NAME, FIELD, OP)
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#define SGTTYMODEN(NAME, FIELD, OP)
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#include "ttymodes.h"
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#undef TTYCHAR
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#undef TTYMODE
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#undef SGTTYCHAR
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#undef SGTTYMODE
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#undef SGTTYMODEN
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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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* Opcodes 0 to 127 are defined to have
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* a one-byte argument.
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*/
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if (opcode >= 0 && opcode < 128) {
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n_bytes += 1;
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(void) packet_get_char();
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break;
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} else {
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/*
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* Opcodes 128 to 159 are defined to have
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* an integer argument.
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*/
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if (opcode >= 128 && opcode < 160) {
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n_bytes += 4;
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(void) packet_get_int();
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break;
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}
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}
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/*
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* It is a truly undefined opcode (160 to 255).
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* We have no idea about its arguments. So we
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* must stop parsing. Note that some data may be
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* left in the packet; hopefully there is nothing
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* more coming after the mode data.
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*/
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log("parse_tty_modes: unknown opcode %d", opcode);
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packet_integrity_check(0, 1, SSH_CMSG_REQUEST_PTY);
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goto set;
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}
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}
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set:
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if (*n_bytes_ptr != n_bytes) {
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*n_bytes_ptr = n_bytes;
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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 tty stuff failed */
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/* Set the new modes for the terminal. */
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if (tcsetattr(fd, TCSANOW, &tio) < 0)
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log("Setting tty modes failed: %.100s", strerror(errno));
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return;
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}
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