1 /* $OpenBSD: ttymodes.c,v 1.26 2006/08/03 03:34:42 deraadt 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>
63 * uint32 (u_int) follows speed in SSH1 and SSH2
65 #define TTY_OP_ISPEED_PROTO1 192
66 #define TTY_OP_OSPEED_PROTO1 193
67 #define TTY_OP_ISPEED_PROTO2 128
68 #define TTY_OP_OSPEED_PROTO2 129
71 * Converts POSIX speed_t to a baud rate. The values of the
72 * constants for speed_t are not themselves portable.
75 speed_to_baud(speed_t speed)
161 * Converts a numeric baud rate to a POSIX speed_t.
164 baud_to_speed(int baud)
250 * Encode a special character into SSH line format.
253 special_char_encode(cc_t c)
255 #ifdef _POSIX_VDISABLE
256 if (c == _POSIX_VDISABLE)
258 #endif /* _POSIX_VDISABLE */
263 * Decode a special character from SSH line format.
266 special_char_decode(u_int c)
268 #ifdef _POSIX_VDISABLE
270 return _POSIX_VDISABLE;
271 #endif /* _POSIX_VDISABLE */
276 * Encodes terminal modes for the terminal referenced by fd
277 * or tiop in a portable manner, and appends the modes to a packet
281 tty_make_modes(int fd, struct termios *tiop)
286 int tty_op_ospeed, tty_op_ispeed;
287 void (*put_arg)(Buffer *, u_int);
291 tty_op_ospeed = TTY_OP_OSPEED_PROTO2;
292 tty_op_ispeed = TTY_OP_ISPEED_PROTO2;
293 put_arg = buffer_put_int;
295 tty_op_ospeed = TTY_OP_OSPEED_PROTO1;
296 tty_op_ispeed = TTY_OP_ISPEED_PROTO1;
297 put_arg = (void (*)(Buffer *, u_int)) buffer_put_char;
301 if (tcgetattr(fd, &tio) == -1) {
302 logit("tcgetattr: %.100s", strerror(errno));
308 /* Store input and output baud rates. */
309 baud = speed_to_baud(cfgetospeed(&tio));
310 debug3("tty_make_modes: ospeed %d", baud);
311 buffer_put_char(&buf, tty_op_ospeed);
312 buffer_put_int(&buf, baud);
313 baud = speed_to_baud(cfgetispeed(&tio));
314 debug3("tty_make_modes: ispeed %d", baud);
315 buffer_put_char(&buf, tty_op_ispeed);
316 buffer_put_int(&buf, baud);
318 /* Store values of mode flags. */
319 #define TTYCHAR(NAME, OP) \
320 debug3("tty_make_modes: %d %d", OP, tio.c_cc[NAME]); \
321 buffer_put_char(&buf, OP); \
322 put_arg(&buf, special_char_encode(tio.c_cc[NAME]));
324 #define TTYMODE(NAME, FIELD, OP) \
325 debug3("tty_make_modes: %d %d", OP, ((tio.FIELD & NAME) != 0)); \
326 buffer_put_char(&buf, OP); \
327 put_arg(&buf, ((tio.FIELD & NAME) != 0));
329 #include "ttymodes.h"
335 /* Mark end of mode data. */
336 buffer_put_char(&buf, TTY_OP_END);
338 packet_put_string(buffer_ptr(&buf), buffer_len(&buf));
340 packet_put_raw(buffer_ptr(&buf), buffer_len(&buf));
345 * Decodes terminal modes for the terminal referenced by fd in a portable
346 * manner from a packet being read.
349 tty_parse_modes(int fd, int *n_bytes_ptr)
355 u_int (*get_arg)(void);
359 *n_bytes_ptr = packet_get_int();
360 debug3("tty_parse_modes: SSH2 n_bytes %d", *n_bytes_ptr);
361 if (*n_bytes_ptr == 0)
363 get_arg = packet_get_int;
366 get_arg = packet_get_char;
371 * Get old attributes for the terminal. We will modify these
372 * flags. I am hoping that if there are any machine-specific
373 * modes, they will initially have reasonable values.
375 if (tcgetattr(fd, &tio) == -1) {
376 logit("tcgetattr: %.100s", strerror(errno));
382 opcode = packet_get_char();
387 /* XXX: future conflict possible */
388 case TTY_OP_ISPEED_PROTO1:
389 case TTY_OP_ISPEED_PROTO2:
391 baud = packet_get_int();
392 debug3("tty_parse_modes: ispeed %d", baud);
394 cfsetispeed(&tio, baud_to_speed(baud)) == -1)
395 error("cfsetispeed failed for %d", baud);
398 /* XXX: future conflict possible */
399 case TTY_OP_OSPEED_PROTO1:
400 case TTY_OP_OSPEED_PROTO2:
402 baud = packet_get_int();
403 debug3("tty_parse_modes: ospeed %d", baud);
405 cfsetospeed(&tio, baud_to_speed(baud)) == -1)
406 error("cfsetospeed failed for %d", baud);
409 #define TTYCHAR(NAME, OP) \
411 n_bytes += arg_size; \
412 tio.c_cc[NAME] = special_char_decode(get_arg()); \
413 debug3("tty_parse_modes: %d %d", OP, tio.c_cc[NAME]); \
415 #define TTYMODE(NAME, FIELD, OP) \
417 n_bytes += arg_size; \
418 if ((arg = get_arg())) \
421 tio.FIELD &= ~NAME; \
422 debug3("tty_parse_modes: %d %d", OP, arg); \
425 #include "ttymodes.h"
431 debug("Ignoring unsupported tty mode opcode %d (0x%x)",
436 * Opcodes 1 to 127 are defined to have
437 * a one-byte argument.
438 * Opcodes 128 to 159 are defined to have
439 * an integer argument.
441 if (opcode > 0 && opcode < 128) {
443 (void) packet_get_char();
445 } else if (opcode >= 128 && opcode < 160) {
447 (void) packet_get_int();
451 * It is a truly undefined opcode (160 to 255).
452 * We have no idea about its arguments. So we
453 * must stop parsing. Note that some data
454 * may be left in the packet; hopefully there
455 * is nothing more coming after the mode data.
457 logit("parse_tty_modes: unknown opcode %d",
464 * Opcodes 1 to 159 are defined to have
466 * Opcodes 160 to 255 are undefined and
467 * cause parsing to stop.
469 if (opcode > 0 && opcode < 160) {
471 (void) packet_get_int();
474 logit("parse_tty_modes: unknown opcode %d",
483 if (*n_bytes_ptr != n_bytes) {
484 *n_bytes_ptr = n_bytes;
485 logit("parse_tty_modes: n_bytes_ptr != n_bytes: %d %d",
486 *n_bytes_ptr, n_bytes);
487 return; /* Don't process bytes passed */
490 return; /* Packet parsed ok but tcgetattr() failed */
492 /* Set the new modes for the terminal. */
493 if (tcsetattr(fd, TCSANOW, &tio) == -1)
494 logit("Setting tty modes failed: %.100s", strerror(errno));