1 /*
2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
5 *
6 * As far as I am concerned, the code I have written for this software
7 * can be used freely for any purpose. Any derived versions of this
8 * software must be clearly marked as such, and if the derived work is
9 * incompatible with the protocol description in the RFC file, it must be
10 * called by a name other than "ssh" or "Secure Shell".
11 */
12
13 /*
14 * SSH2 tty modes support by Kevin Steves.
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 /*
39 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
40 * Use is subject to license terms.
41 */
42
43 /*
44 * Encoding and decoding of terminal modes in a portable way.
45 * Much of the format is defined in ttymodes.h; it is included multiple times
46 * into this file with the appropriate macro definitions to generate the
47 * suitable code.
48 */
49
50 #include "includes.h"
51 RCSID("$OpenBSD: ttymodes.c,v 1.18 2002/06/19 00:27:55 deraadt Exp $");
52
53 #include "packet.h"
54 #include "log.h"
55 #include "ssh1.h"
56 #include "compat.h"
57 #include "buffer.h"
58 #include "bufaux.h"
59
60 #define TTY_OP_END 0
61 /*
62 * uint32 (u_int) follows speed in SSH1 and SSH2
63 */
64 #define TTY_OP_ISPEED_PROTO1 192
65 #define TTY_OP_OSPEED_PROTO1 193
66 #define TTY_OP_ISPEED_PROTO2 128
67 #define TTY_OP_OSPEED_PROTO2 129
68
69 /*
70 * Converts POSIX speed_t to a baud rate. The values of the
71 * constants for speed_t are not themselves portable.
72 */
73 static int
speed_to_baud(speed_t speed)74 speed_to_baud(speed_t speed)
75 {
76 switch (speed) {
77 case B0:
78 return 0;
79 case B50:
80 return 50;
81 case B75:
82 return 75;
83 case B110:
84 return 110;
85 case B134:
86 return 134;
87 case B150:
88 return 150;
89 case B200:
90 return 200;
91 case B300:
92 return 300;
93 case B600:
94 return 600;
95 case B1200:
96 return 1200;
97 case B1800:
98 return 1800;
99 case B2400:
100 return 2400;
101 case B4800:
102 return 4800;
103 case B9600:
104 return 9600;
105
106 #ifdef B19200
107 case B19200:
108 return 19200;
109 #else /* B19200 */
110 #ifdef EXTA
111 case EXTA:
112 return 19200;
113 #endif /* EXTA */
114 #endif /* B19200 */
115
116 #ifdef B38400
117 case B38400:
118 return 38400;
119 #else /* B38400 */
120 #ifdef EXTB
121 case EXTB:
122 return 38400;
123 #endif /* EXTB */
124 #endif /* B38400 */
125
126 #ifdef B7200
127 case B7200:
128 return 7200;
129 #endif /* B7200 */
130 #ifdef B14400
131 case B14400:
132 return 14400;
133 #endif /* B14400 */
134 #ifdef B28800
135 case B28800:
136 return 28800;
137 #endif /* B28800 */
138 #ifdef B57600
139 case B57600:
140 return 57600;
141 #endif /* B57600 */
142 #ifdef B76800
143 case B76800:
144 return 76800;
145 #endif /* B76800 */
146 #ifdef B115200
147 case B115200:
148 return 115200;
149 #endif /* B115200 */
150 #ifdef B230400
151 case B230400:
152 return 230400;
153 #endif /* B230400 */
154 #ifdef B460800
155 case B460800:
156 return 460800;
157 #endif /* B460800 */
158 #ifdef B921600
159 case B921600:
160 return 921600;
161 #endif /* B921600 */
162 default:
163 return 9600;
164 }
165 }
166
167 /*
168 * Converts a numeric baud rate to a POSIX speed_t.
169 */
170 static speed_t
baud_to_speed(int baud)171 baud_to_speed(int baud)
172 {
173 switch (baud) {
174 case 0:
175 return B0;
176 case 50:
177 return B50;
178 case 75:
179 return B75;
180 case 110:
181 return B110;
182 case 134:
183 return B134;
184 case 150:
185 return B150;
186 case 200:
187 return B200;
188 case 300:
189 return B300;
190 case 600:
191 return B600;
192 case 1200:
193 return B1200;
194 case 1800:
195 return B1800;
196 case 2400:
197 return B2400;
198 case 4800:
199 return B4800;
200 case 9600:
201 return B9600;
202
203 #ifdef B19200
204 case 19200:
205 return B19200;
206 #else /* B19200 */
207 #ifdef EXTA
208 case 19200:
209 return EXTA;
210 #endif /* EXTA */
211 #endif /* B19200 */
212
213 #ifdef B38400
214 case 38400:
215 return B38400;
216 #else /* B38400 */
217 #ifdef EXTB
218 case 38400:
219 return EXTB;
220 #endif /* EXTB */
221 #endif /* B38400 */
222
223 #ifdef B7200
224 case 7200:
225 return B7200;
226 #endif /* B7200 */
227 #ifdef B14400
228 case 14400:
229 return B14400;
230 #endif /* B14400 */
231 #ifdef B28800
232 case 28800:
233 return B28800;
234 #endif /* B28800 */
235 #ifdef B57600
236 case 57600:
237 return B57600;
238 #endif /* B57600 */
239 #ifdef B76800
240 case 76800:
241 return B76800;
242 #endif /* B76800 */
243 #ifdef B115200
244 case 115200:
245 return B115200;
246 #endif /* B115200 */
247 #ifdef B230400
248 case 230400:
249 return B230400;
250 #endif /* B230400 */
251 #ifdef B460800
252 case 460800:
253 return B460800;
254 #endif /* B460800 */
255 #ifdef B921600
256 case 921600:
257 return B921600;
258 #endif /* B921600 */
259 default:
260 return B9600;
261 }
262 }
263
264 /*
265 * Encodes terminal modes for the terminal referenced by fd
266 * or tiop in a portable manner, and appends the modes to a packet
267 * being constructed.
268 */
269 void
tty_make_modes(int fd,struct termios * tiop)270 tty_make_modes(int fd, struct termios *tiop)
271 {
272 struct termios tio;
273 int baud;
274 Buffer buf;
275 int tty_op_ospeed, tty_op_ispeed;
276 void (*put_arg)(Buffer *, u_int);
277
278 buffer_init(&buf);
279 if (compat20) {
280 tty_op_ospeed = TTY_OP_OSPEED_PROTO2;
281 tty_op_ispeed = TTY_OP_ISPEED_PROTO2;
282 put_arg = buffer_put_int;
283 } else {
284 tty_op_ospeed = TTY_OP_OSPEED_PROTO1;
285 tty_op_ispeed = TTY_OP_ISPEED_PROTO1;
286 put_arg = (void (*)(Buffer *, u_int)) buffer_put_char;
287 }
288
289 if (tiop == NULL) {
290 if (tcgetattr(fd, &tio) == -1) {
291 log("tcgetattr: %.100s", strerror(errno));
292 goto end;
293 }
294 } else
295 tio = *tiop;
296
297 /* Store input and output baud rates. */
298 baud = speed_to_baud(cfgetospeed(&tio));
299 debug3("tty_make_modes: ospeed %d", baud);
300 buffer_put_char(&buf, tty_op_ospeed);
301 buffer_put_int(&buf, baud);
302 baud = speed_to_baud(cfgetispeed(&tio));
303 debug3("tty_make_modes: ispeed %d", baud);
304 buffer_put_char(&buf, tty_op_ispeed);
305 buffer_put_int(&buf, baud);
306
307 /* Store values of mode flags. */
308 #define TTYCHAR(NAME, OP) \
309 debug3("tty_make_modes: %d %d", OP, tio.c_cc[NAME]); \
310 buffer_put_char(&buf, OP); \
311 put_arg(&buf, tio.c_cc[NAME]);
312
313 #define TTYMODE(NAME, FIELD, OP) \
314 debug3("tty_make_modes: %d %d", OP, ((tio.FIELD & NAME) != 0)); \
315 buffer_put_char(&buf, OP); \
316 put_arg(&buf, ((tio.FIELD & NAME) != 0));
317
318 #include "ttymodes.h"
319
320 #undef TTYCHAR
321 #undef TTYMODE
322
323 end:
324 /* Mark end of mode data. */
325 buffer_put_char(&buf, TTY_OP_END);
326 if (compat20)
327 packet_put_string(buffer_ptr(&buf), buffer_len(&buf));
328 else
329 packet_put_raw(buffer_ptr(&buf), buffer_len(&buf));
330 buffer_free(&buf);
331 }
332
333 /*
334 * Decodes terminal modes for the terminal referenced by fd in a portable
335 * manner from a packet being read.
336 */
337 void
tty_parse_modes(int fd,int * n_bytes_ptr)338 tty_parse_modes(int fd, int *n_bytes_ptr)
339 {
340 struct termios tio;
341 int opcode, baud;
342 int n_bytes = 0;
343 int failure = 0;
344 u_int (*get_arg)(void);
345 int arg, arg_size;
346
347 if (compat20) {
348 *n_bytes_ptr = packet_get_int();
349 debug3("tty_parse_modes: SSH2 n_bytes %d", *n_bytes_ptr);
350 if (*n_bytes_ptr == 0)
351 return;
352 get_arg = packet_get_int;
353 arg_size = 4;
354 } else {
355 get_arg = packet_get_char;
356 arg_size = 1;
357 }
358
359 /*
360 * Get old attributes for the terminal. We will modify these
361 * flags. I am hoping that if there are any machine-specific
362 * modes, they will initially have reasonable values.
363 */
364 if (tcgetattr(fd, &tio) == -1) {
365 log("tcgetattr: %.100s", strerror(errno));
366 failure = -1;
367 }
368
369 for (;;) {
370 n_bytes += 1;
371 opcode = packet_get_char();
372 switch (opcode) {
373 case TTY_OP_END:
374 goto set;
375
376 /* XXX: future conflict possible */
377 case TTY_OP_ISPEED_PROTO1:
378 case TTY_OP_ISPEED_PROTO2:
379 n_bytes += 4;
380 baud = packet_get_int();
381 debug3("tty_parse_modes: ispeed %d", baud);
382 if (failure != -1 && cfsetispeed(&tio, baud_to_speed(baud)) == -1)
383 error("cfsetispeed failed for %d", baud);
384 break;
385
386 /* XXX: future conflict possible */
387 case TTY_OP_OSPEED_PROTO1:
388 case TTY_OP_OSPEED_PROTO2:
389 n_bytes += 4;
390 baud = packet_get_int();
391 debug3("tty_parse_modes: ospeed %d", baud);
392 if (failure != -1 && cfsetospeed(&tio, baud_to_speed(baud)) == -1)
393 error("cfsetospeed failed for %d", baud);
394 break;
395
396 #define TTYCHAR(NAME, OP) \
397 case OP: \
398 n_bytes += arg_size; \
399 tio.c_cc[NAME] = get_arg(); \
400 debug3("tty_parse_modes: %d %d", OP, tio.c_cc[NAME]); \
401 break;
402 #define TTYMODE(NAME, FIELD, OP) \
403 case OP: \
404 n_bytes += arg_size; \
405 if ((arg = get_arg())) \
406 tio.FIELD |= NAME; \
407 else \
408 tio.FIELD &= ~NAME; \
409 debug3("tty_parse_modes: %d %d", OP, arg); \
410 break;
411
412 #include "ttymodes.h"
413
414 #undef TTYCHAR
415 #undef TTYMODE
416
417 default:
418 debug("Ignoring unsupported tty mode opcode %d (0x%x)",
419 opcode, opcode);
420 if (!compat20) {
421 /*
422 * SSH1:
423 * Opcodes 1 to 127 are defined to have
424 * a one-byte argument.
425 * Opcodes 128 to 159 are defined to have
426 * an integer argument.
427 */
428 if (opcode > 0 && opcode < 128) {
429 n_bytes += 1;
430 (void) packet_get_char();
431 break;
432 } else if (opcode >= 128 && opcode < 160) {
433 n_bytes += 4;
434 (void) packet_get_int();
435 break;
436 } else {
437 /*
438 * It is a truly undefined opcode (160 to 255).
439 * We have no idea about its arguments. So we
440 * must stop parsing. Note that some data may be
441 * left in the packet; hopefully there is nothing
442 * more coming after the mode data.
443 */
444 log("parse_tty_modes: unknown opcode %d", opcode);
445 goto set;
446 }
447 } else {
448 /*
449 * SSH2:
450 * Opcodes 1 to 159 are defined to have
451 * a uint32 argument.
452 * Opcodes 160 to 255 are undefined and
453 * cause parsing to stop.
454 */
455 if (opcode > 0 && opcode < 160) {
456 n_bytes += 4;
457 (void) packet_get_int();
458 break;
459 } else {
460 log("parse_tty_modes: unknown opcode %d", opcode);
461 goto set;
462 }
463 }
464 }
465 }
466
467 set:
468 if (*n_bytes_ptr != n_bytes) {
469 *n_bytes_ptr = n_bytes;
470 log("parse_tty_modes: n_bytes_ptr != n_bytes: %d %d",
471 *n_bytes_ptr, n_bytes);
472 return; /* Don't process bytes passed */
473 }
474 if (failure == -1)
475 return; /* Packet parsed ok but tcgetattr() failed */
476
477 /* Set the new modes for the terminal. */
478 if (tcsetattr(fd, TCSANOW, &tio) == -1)
479 log("Setting tty modes failed: %.100s", strerror(errno));
480 }
481