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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 | * Encoding and decoding of terminal modes in a portable way. | |
40 | * Much of the format is defined in ttymodes.h; it is included multiple times | |
41 | * into this file with the appropriate macro definitions to generate the | |
42 | * suitable code. | |
43 | */ | |
44 | ||
45 | #include "includes.h" | |
46 | RCSID("$OpenBSD: ttymodes.c,v 1.19 2003/04/08 20:21:29 itojun Exp $"); | |
47 | ||
48 | #include "packet.h" | |
49 | #include "log.h" | |
50 | #include "ssh1.h" | |
51 | #include "compat.h" | |
52 | #include "buffer.h" | |
53 | #include "bufaux.h" | |
54 | ||
55 | #define TTY_OP_END 0 | |
56 | /* | |
57 | * uint32 (u_int) follows speed in SSH1 and SSH2 | |
58 | */ | |
59 | #define TTY_OP_ISPEED_PROTO1 192 | |
60 | #define TTY_OP_OSPEED_PROTO1 193 | |
61 | #define TTY_OP_ISPEED_PROTO2 128 | |
62 | #define TTY_OP_OSPEED_PROTO2 129 | |
63 | ||
64 | /* | |
65 | * Converts POSIX speed_t to a baud rate. The values of the | |
66 | * constants for speed_t are not themselves portable. | |
67 | */ | |
68 | static int | |
69 | speed_to_baud(speed_t speed) | |
70 | { | |
71 | switch (speed) { | |
72 | case B0: | |
73 | return 0; | |
74 | case B50: | |
75 | return 50; | |
76 | case B75: | |
77 | return 75; | |
78 | case B110: | |
79 | return 110; | |
80 | case B134: | |
81 | return 134; | |
82 | case B150: | |
83 | return 150; | |
84 | case B200: | |
85 | return 200; | |
86 | case B300: | |
87 | return 300; | |
88 | case B600: | |
89 | return 600; | |
90 | case B1200: | |
91 | return 1200; | |
92 | case B1800: | |
93 | return 1800; | |
94 | case B2400: | |
95 | return 2400; | |
96 | case B4800: | |
97 | return 4800; | |
98 | case B9600: | |
99 | return 9600; | |
100 | ||
101 | #ifdef B19200 | |
102 | case B19200: | |
103 | return 19200; | |
104 | #else /* B19200 */ | |
105 | #ifdef EXTA | |
106 | case EXTA: | |
107 | return 19200; | |
108 | #endif /* EXTA */ | |
109 | #endif /* B19200 */ | |
110 | ||
111 | #ifdef B38400 | |
112 | case B38400: | |
113 | return 38400; | |
114 | #else /* B38400 */ | |
115 | #ifdef EXTB | |
116 | case EXTB: | |
117 | return 38400; | |
118 | #endif /* EXTB */ | |
119 | #endif /* B38400 */ | |
120 | ||
121 | #ifdef B7200 | |
122 | case B7200: | |
123 | return 7200; | |
124 | #endif /* B7200 */ | |
125 | #ifdef B14400 | |
126 | case B14400: | |
127 | return 14400; | |
128 | #endif /* B14400 */ | |
129 | #ifdef B28800 | |
130 | case B28800: | |
131 | return 28800; | |
132 | #endif /* B28800 */ | |
133 | #ifdef B57600 | |
134 | case B57600: | |
135 | return 57600; | |
136 | #endif /* B57600 */ | |
137 | #ifdef B76800 | |
138 | case B76800: | |
139 | return 76800; | |
140 | #endif /* B76800 */ | |
141 | #ifdef B115200 | |
142 | case B115200: | |
143 | return 115200; | |
144 | #endif /* B115200 */ | |
145 | #ifdef B230400 | |
146 | case B230400: | |
147 | return 230400; | |
148 | #endif /* B230400 */ | |
149 | default: | |
150 | return 9600; | |
151 | } | |
152 | } | |
153 | ||
154 | /* | |
155 | * Converts a numeric baud rate to a POSIX speed_t. | |
156 | */ | |
157 | static speed_t | |
158 | baud_to_speed(int baud) | |
159 | { | |
160 | switch (baud) { | |
161 | case 0: | |
162 | return B0; | |
163 | case 50: | |
164 | return B50; | |
165 | case 75: | |
166 | return B75; | |
167 | case 110: | |
168 | return B110; | |
169 | case 134: | |
170 | return B134; | |
171 | case 150: | |
172 | return B150; | |
173 | case 200: | |
174 | return B200; | |
175 | case 300: | |
176 | return B300; | |
177 | case 600: | |
178 | return B600; | |
179 | case 1200: | |
180 | return B1200; | |
181 | case 1800: | |
182 | return B1800; | |
183 | case 2400: | |
184 | return B2400; | |
185 | case 4800: | |
186 | return B4800; | |
187 | case 9600: | |
188 | return B9600; | |
189 | ||
190 | #ifdef B19200 | |
191 | case 19200: | |
192 | return B19200; | |
193 | #else /* B19200 */ | |
194 | #ifdef EXTA | |
195 | case 19200: | |
196 | return EXTA; | |
197 | #endif /* EXTA */ | |
198 | #endif /* B19200 */ | |
199 | ||
200 | #ifdef B38400 | |
201 | case 38400: | |
202 | return B38400; | |
203 | #else /* B38400 */ | |
204 | #ifdef EXTB | |
205 | case 38400: | |
206 | return EXTB; | |
207 | #endif /* EXTB */ | |
208 | #endif /* B38400 */ | |
209 | ||
210 | #ifdef B7200 | |
211 | case 7200: | |
212 | return B7200; | |
213 | #endif /* B7200 */ | |
214 | #ifdef B14400 | |
215 | case 14400: | |
216 | return B14400; | |
217 | #endif /* B14400 */ | |
218 | #ifdef B28800 | |
219 | case 28800: | |
220 | return B28800; | |
221 | #endif /* B28800 */ | |
222 | #ifdef B57600 | |
223 | case 57600: | |
224 | return B57600; | |
225 | #endif /* B57600 */ | |
226 | #ifdef B76800 | |
227 | case 76800: | |
228 | return B76800; | |
229 | #endif /* B76800 */ | |
230 | #ifdef B115200 | |
231 | case 115200: | |
232 | return B115200; | |
233 | #endif /* B115200 */ | |
234 | #ifdef B230400 | |
235 | case 230400: | |
236 | return B230400; | |
237 | #endif /* B230400 */ | |
238 | default: | |
239 | return B9600; | |
240 | } | |
241 | } | |
242 | ||
243 | /* | |
244 | * Encode a special character into SSH line format. | |
245 | */ | |
246 | static u_int | |
247 | special_char_encode(cc_t c) | |
248 | { | |
249 | #ifdef _POSIX_VDISABLE | |
250 | if (c == _POSIX_VDISABLE) | |
251 | return 255; | |
252 | #endif /* _POSIX_VDISABLE */ | |
253 | return c; | |
254 | } | |
255 | ||
256 | /* | |
257 | * Decode a special character from SSH line format. | |
258 | */ | |
259 | static cc_t | |
260 | special_char_decode(u_int c) | |
261 | { | |
262 | #ifdef _POSIX_VDISABLE | |
263 | if (c == 255) | |
264 | return _POSIX_VDISABLE; | |
265 | #endif /* _POSIX_VDISABLE */ | |
266 | return c; | |
267 | } | |
268 | ||
269 | /* | |
270 | * Encodes terminal modes for the terminal referenced by fd | |
271 | * or tiop in a portable manner, and appends the modes to a packet | |
272 | * being constructed. | |
273 | */ | |
274 | void | |
275 | tty_make_modes(int fd, struct termios *tiop) | |
276 | { | |
277 | struct termios tio; | |
278 | int baud; | |
279 | Buffer buf; | |
280 | int tty_op_ospeed, tty_op_ispeed; | |
281 | void (*put_arg)(Buffer *, u_int); | |
282 | ||
283 | buffer_init(&buf); | |
284 | if (compat20) { | |
285 | tty_op_ospeed = TTY_OP_OSPEED_PROTO2; | |
286 | tty_op_ispeed = TTY_OP_ISPEED_PROTO2; | |
287 | put_arg = buffer_put_int; | |
288 | } else { | |
289 | tty_op_ospeed = TTY_OP_OSPEED_PROTO1; | |
290 | tty_op_ispeed = TTY_OP_ISPEED_PROTO1; | |
291 | put_arg = (void (*)(Buffer *, u_int)) buffer_put_char; | |
292 | } | |
293 | ||
294 | if (tiop == NULL) { | |
295 | if (tcgetattr(fd, &tio) == -1) { | |
296 | logit("tcgetattr: %.100s", strerror(errno)); | |
297 | goto end; | |
298 | } | |
299 | } else | |
300 | tio = *tiop; | |
301 | ||
302 | /* Store input and output baud rates. */ | |
303 | baud = speed_to_baud(cfgetospeed(&tio)); | |
304 | debug3("tty_make_modes: ospeed %d", baud); | |
305 | buffer_put_char(&buf, tty_op_ospeed); | |
306 | buffer_put_int(&buf, baud); | |
307 | baud = speed_to_baud(cfgetispeed(&tio)); | |
308 | debug3("tty_make_modes: ispeed %d", baud); | |
309 | buffer_put_char(&buf, tty_op_ispeed); | |
310 | buffer_put_int(&buf, baud); | |
311 | ||
312 | /* Store values of mode flags. */ | |
313 | #define TTYCHAR(NAME, OP) \ | |
314 | debug3("tty_make_modes: %d %d", OP, tio.c_cc[NAME]); \ | |
315 | buffer_put_char(&buf, OP); \ | |
316 | put_arg(&buf, special_char_encode(tio.c_cc[NAME])); | |
317 | ||
318 | #define TTYMODE(NAME, FIELD, OP) \ | |
319 | debug3("tty_make_modes: %d %d", OP, ((tio.FIELD & NAME) != 0)); \ | |
320 | buffer_put_char(&buf, OP); \ | |
321 | put_arg(&buf, ((tio.FIELD & NAME) != 0)); | |
322 | ||
323 | #include "ttymodes.h" | |
324 | ||
325 | #undef TTYCHAR | |
326 | #undef TTYMODE | |
327 | ||
328 | end: | |
329 | /* Mark end of mode data. */ | |
330 | buffer_put_char(&buf, TTY_OP_END); | |
331 | if (compat20) | |
332 | packet_put_string(buffer_ptr(&buf), buffer_len(&buf)); | |
333 | else | |
334 | packet_put_raw(buffer_ptr(&buf), buffer_len(&buf)); | |
335 | buffer_free(&buf); | |
336 | } | |
337 | ||
338 | /* | |
339 | * Decodes terminal modes for the terminal referenced by fd in a portable | |
340 | * manner from a packet being read. | |
341 | */ | |
342 | void | |
343 | tty_parse_modes(int fd, int *n_bytes_ptr) | |
344 | { | |
345 | struct termios tio; | |
346 | int opcode, baud; | |
347 | int n_bytes = 0; | |
348 | int failure = 0; | |
349 | u_int (*get_arg)(void); | |
350 | int arg, arg_size; | |
351 | ||
352 | if (compat20) { | |
353 | *n_bytes_ptr = packet_get_int(); | |
354 | debug3("tty_parse_modes: SSH2 n_bytes %d", *n_bytes_ptr); | |
355 | if (*n_bytes_ptr == 0) | |
356 | return; | |
357 | get_arg = packet_get_int; | |
358 | arg_size = 4; | |
359 | } else { | |
360 | get_arg = packet_get_char; | |
361 | arg_size = 1; | |
362 | } | |
363 | ||
364 | /* | |
365 | * Get old attributes for the terminal. We will modify these | |
366 | * flags. I am hoping that if there are any machine-specific | |
367 | * modes, they will initially have reasonable values. | |
368 | */ | |
369 | if (tcgetattr(fd, &tio) == -1) { | |
370 | logit("tcgetattr: %.100s", strerror(errno)); | |
371 | failure = -1; | |
372 | } | |
373 | ||
374 | for (;;) { | |
375 | n_bytes += 1; | |
376 | opcode = packet_get_char(); | |
377 | switch (opcode) { | |
378 | case TTY_OP_END: | |
379 | goto set; | |
380 | ||
381 | /* XXX: future conflict possible */ | |
382 | case TTY_OP_ISPEED_PROTO1: | |
383 | case TTY_OP_ISPEED_PROTO2: | |
384 | n_bytes += 4; | |
385 | baud = packet_get_int(); | |
386 | debug3("tty_parse_modes: ispeed %d", baud); | |
387 | if (failure != -1 && cfsetispeed(&tio, baud_to_speed(baud)) == -1) | |
388 | error("cfsetispeed failed for %d", baud); | |
389 | break; | |
390 | ||
391 | /* XXX: future conflict possible */ | |
392 | case TTY_OP_OSPEED_PROTO1: | |
393 | case TTY_OP_OSPEED_PROTO2: | |
394 | n_bytes += 4; | |
395 | baud = packet_get_int(); | |
396 | debug3("tty_parse_modes: ospeed %d", baud); | |
397 | if (failure != -1 && cfsetospeed(&tio, baud_to_speed(baud)) == -1) | |
398 | error("cfsetospeed failed for %d", baud); | |
399 | break; | |
400 | ||
401 | #define TTYCHAR(NAME, OP) \ | |
402 | case OP: \ | |
403 | n_bytes += arg_size; \ | |
404 | tio.c_cc[NAME] = special_char_decode(get_arg()); \ | |
405 | debug3("tty_parse_modes: %d %d", OP, tio.c_cc[NAME]); \ | |
406 | break; | |
407 | #define TTYMODE(NAME, FIELD, OP) \ | |
408 | case OP: \ | |
409 | n_bytes += arg_size; \ | |
410 | if ((arg = get_arg())) \ | |
411 | tio.FIELD |= NAME; \ | |
412 | else \ | |
413 | tio.FIELD &= ~NAME; \ | |
414 | debug3("tty_parse_modes: %d %d", OP, arg); \ | |
415 | break; | |
416 | ||
417 | #include "ttymodes.h" | |
418 | ||
419 | #undef TTYCHAR | |
420 | #undef TTYMODE | |
421 | ||
422 | default: | |
423 | debug("Ignoring unsupported tty mode opcode %d (0x%x)", | |
424 | opcode, opcode); | |
425 | if (!compat20) { | |
426 | /* | |
427 | * SSH1: | |
428 | * Opcodes 1 to 127 are defined to have | |
429 | * a one-byte argument. | |
430 | * Opcodes 128 to 159 are defined to have | |
431 | * an integer argument. | |
432 | */ | |
433 | if (opcode > 0 && opcode < 128) { | |
434 | n_bytes += 1; | |
435 | (void) packet_get_char(); | |
436 | break; | |
437 | } else if (opcode >= 128 && opcode < 160) { | |
438 | n_bytes += 4; | |
439 | (void) packet_get_int(); | |
440 | break; | |
441 | } else { | |
442 | /* | |
443 | * It is a truly undefined opcode (160 to 255). | |
444 | * We have no idea about its arguments. So we | |
445 | * must stop parsing. Note that some data may be | |
446 | * left in the packet; hopefully there is nothing | |
447 | * more coming after the mode data. | |
448 | */ | |
449 | logit("parse_tty_modes: unknown opcode %d", opcode); | |
450 | goto set; | |
451 | } | |
452 | } else { | |
453 | /* | |
454 | * SSH2: | |
455 | * Opcodes 1 to 159 are defined to have | |
456 | * a uint32 argument. | |
457 | * Opcodes 160 to 255 are undefined and | |
458 | * cause parsing to stop. | |
459 | */ | |
460 | if (opcode > 0 && opcode < 160) { | |
461 | n_bytes += 4; | |
462 | (void) packet_get_int(); | |
463 | break; | |
464 | } else { | |
465 | logit("parse_tty_modes: unknown opcode %d", opcode); | |
466 | goto set; | |
467 | } | |
468 | } | |
469 | } | |
470 | } | |
471 | ||
472 | set: | |
473 | if (*n_bytes_ptr != n_bytes) { | |
474 | *n_bytes_ptr = n_bytes; | |
475 | logit("parse_tty_modes: n_bytes_ptr != n_bytes: %d %d", | |
476 | *n_bytes_ptr, n_bytes); | |
477 | return; /* Don't process bytes passed */ | |
478 | } | |
479 | if (failure == -1) | |
480 | return; /* Packet parsed ok but tcgetattr() failed */ | |
481 | ||
482 | /* Set the new modes for the terminal. */ | |
483 | if (tcsetattr(fd, TCSANOW, &tio) == -1) | |
484 | logit("Setting tty modes failed: %.100s", strerror(errno)); | |
485 | } |