1 /* $OpenBSD: ttymodes.c,v 1.32 2017/04/30 23:26:54 djm Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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".
15 * SSH2 tty modes support by Kevin Steves.
16 * Copyright (c) 2001 Kevin Steves. All rights reserved.
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
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.
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.
40 * Encoding and decoding of terminal modes in a portable way.
41 * Much of the format is defined in ttymodes.h; it is included multiple times
42 * into this file with the appropriate macro definitions to generate the
48 #include <sys/types.h>
62 * uint32 (u_int) follows speed.
64 #define TTY_OP_ISPEED 128
65 #define TTY_OP_OSPEED 129
68 * Converts POSIX speed_t to a baud rate. The values of the
69 * constants for speed_t are not themselves portable.
72 speed_to_baud(speed_t speed)
158 * Converts a numeric baud rate to a POSIX speed_t.
161 baud_to_speed(int baud)
247 * Encode a special character into SSH line format.
250 special_char_encode(cc_t c)
252 #ifdef _POSIX_VDISABLE
253 if (c == _POSIX_VDISABLE)
255 #endif /* _POSIX_VDISABLE */
260 * Decode a special character from SSH line format.
263 special_char_decode(u_int c)
265 #ifdef _POSIX_VDISABLE
267 return _POSIX_VDISABLE;
268 #endif /* _POSIX_VDISABLE */
273 * Encodes terminal modes for the terminal referenced by fd
274 * or tiop in a portable manner, and appends the modes to a packet
278 tty_make_modes(int fd, struct termios *tiop)
288 debug("tty_make_modes: no fd or tio");
291 if (tcgetattr(fd, &tio) == -1) {
292 logit("tcgetattr: %.100s", strerror(errno));
298 /* Store input and output baud rates. */
299 baud = speed_to_baud(cfgetospeed(&tio));
300 buffer_put_char(&buf, TTY_OP_OSPEED);
301 buffer_put_int(&buf, baud);
302 baud = speed_to_baud(cfgetispeed(&tio));
303 buffer_put_char(&buf, TTY_OP_ISPEED);
304 buffer_put_int(&buf, baud);
306 /* Store values of mode flags. */
307 #define TTYCHAR(NAME, OP) \
308 buffer_put_char(&buf, OP); \
309 buffer_put_int(&buf, special_char_encode(tio.c_cc[NAME]));
311 #define TTYMODE(NAME, FIELD, OP) \
312 buffer_put_char(&buf, OP); \
313 buffer_put_int(&buf, ((tio.FIELD & NAME) != 0));
315 #include "ttymodes.h"
321 /* Mark end of mode data. */
322 buffer_put_char(&buf, TTY_OP_END);
323 packet_put_string(buffer_ptr(&buf), buffer_len(&buf));
328 * Decodes terminal modes for the terminal referenced by fd in a portable
329 * manner from a packet being read.
332 tty_parse_modes(int fd, int *n_bytes_ptr)
339 *n_bytes_ptr = packet_get_int();
340 if (*n_bytes_ptr == 0)
344 * Get old attributes for the terminal. We will modify these
345 * flags. I am hoping that if there are any machine-specific
346 * modes, they will initially have reasonable values.
348 if (tcgetattr(fd, &tio) == -1) {
349 logit("tcgetattr: %.100s", strerror(errno));
355 opcode = packet_get_char();
362 baud = packet_get_int();
364 cfsetispeed(&tio, baud_to_speed(baud)) == -1)
365 error("cfsetispeed failed for %d", baud);
370 baud = packet_get_int();
372 cfsetospeed(&tio, baud_to_speed(baud)) == -1)
373 error("cfsetospeed failed for %d", baud);
376 #define TTYCHAR(NAME, OP) \
379 tio.c_cc[NAME] = special_char_decode(packet_get_int()); \
381 #define TTYMODE(NAME, FIELD, OP) \
384 if (packet_get_int()) \
387 tio.FIELD &= ~NAME; \
390 #include "ttymodes.h"
396 debug("Ignoring unsupported tty mode opcode %d (0x%x)",
400 * Opcodes 1 to 159 are defined to have a uint32
402 * Opcodes 160 to 255 are undefined and cause parsing
405 if (opcode > 0 && opcode < 160) {
407 (void) packet_get_int();
410 logit("parse_tty_modes: unknown opcode %d",
418 if (*n_bytes_ptr != n_bytes) {
419 *n_bytes_ptr = n_bytes;
420 logit("parse_tty_modes: n_bytes_ptr != n_bytes: %d %d",
421 *n_bytes_ptr, n_bytes);
422 return; /* Don't process bytes passed */
425 return; /* Packet parsed ok but tcgetattr() failed */
427 /* Set the new modes for the terminal. */
428 if (tcsetattr(fd, TCSANOW, &tio) == -1)
429 logit("Setting tty modes failed: %.100s", strerror(errno));