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Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
5 * Created: Tue Mar 21 15:59:15 1995 ylo
6 * Encoding and decoding of terminal modes in a portable way.
7 * Much of the format is defined in ttymodes.h; it is included multiple times
8 * into this file with the appropriate macro definitions to generate the
9 * suitable code.
10 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100011
12#include "includes.h"
Damien Miller6536c7d2000-06-22 21:32:31 +100013RCSID("$OpenBSD: ttymodes.c,v 1.7 2000/06/20 01:39:45 markus Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100014
15#include "packet.h"
16#include "ssh.h"
17
18#define TTY_OP_END 0
Damien Miller95def091999-11-25 00:26:21 +110019#define TTY_OP_ISPEED 192 /* int follows */
20#define TTY_OP_OSPEED 193 /* int follows */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100021
Damien Miller95def091999-11-25 00:26:21 +110022/*
23 * Converts POSIX speed_t to a baud rate. The values of the
24 * constants for speed_t are not themselves portable.
25 */
Damien Miller4af51302000-04-16 11:18:38 +100026static int
Damien Miller95def091999-11-25 00:26:21 +110027speed_to_baud(speed_t speed)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100028{
Damien Miller95def091999-11-25 00:26:21 +110029 switch (speed) {
30 case B0:
31 return 0;
32 case B50:
33 return 50;
34 case B75:
35 return 75;
36 case B110:
37 return 110;
38 case B134:
39 return 134;
40 case B150:
41 return 150;
42 case B200:
43 return 200;
44 case B300:
45 return 300;
46 case B600:
47 return 600;
48 case B1200:
49 return 1200;
50 case B1800:
51 return 1800;
52 case B2400:
53 return 2400;
54 case B4800:
55 return 4800;
56 case B9600:
57 return 9600;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100058
59#ifdef B19200
Damien Miller95def091999-11-25 00:26:21 +110060 case B19200:
61 return 19200;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100062#else /* B19200 */
63#ifdef EXTA
Damien Miller95def091999-11-25 00:26:21 +110064 case EXTA:
65 return 19200;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100066#endif /* EXTA */
67#endif /* B19200 */
68
69#ifdef B38400
Damien Miller95def091999-11-25 00:26:21 +110070 case B38400:
71 return 38400;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100072#else /* B38400 */
73#ifdef EXTB
Damien Miller95def091999-11-25 00:26:21 +110074 case EXTB:
75 return 38400;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100076#endif /* EXTB */
77#endif /* B38400 */
78
79#ifdef B7200
Damien Miller95def091999-11-25 00:26:21 +110080 case B7200:
81 return 7200;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100082#endif /* B7200 */
83#ifdef B14400
Damien Miller95def091999-11-25 00:26:21 +110084 case B14400:
85 return 14400;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100086#endif /* B14400 */
87#ifdef B28800
Damien Miller95def091999-11-25 00:26:21 +110088 case B28800:
89 return 28800;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100090#endif /* B28800 */
91#ifdef B57600
Damien Miller95def091999-11-25 00:26:21 +110092 case B57600:
93 return 57600;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100094#endif /* B57600 */
95#ifdef B76800
Damien Miller95def091999-11-25 00:26:21 +110096 case B76800:
97 return 76800;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100098#endif /* B76800 */
99#ifdef B115200
Damien Miller95def091999-11-25 00:26:21 +1100100 case B115200:
101 return 115200;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000102#endif /* B115200 */
103#ifdef B230400
Damien Miller95def091999-11-25 00:26:21 +1100104 case B230400:
105 return 230400;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000106#endif /* B230400 */
Damien Miller95def091999-11-25 00:26:21 +1100107 default:
108 return 9600;
109 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000110}
111
Damien Miller95def091999-11-25 00:26:21 +1100112/*
113 * Converts a numeric baud rate to a POSIX speed_t.
114 */
Damien Miller4af51302000-04-16 11:18:38 +1000115static speed_t
Damien Miller95def091999-11-25 00:26:21 +1100116baud_to_speed(int baud)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000117{
Damien Miller95def091999-11-25 00:26:21 +1100118 switch (baud) {
119 case 0:
120 return B0;
121 case 50:
122 return B50;
123 case 75:
124 return B75;
125 case 110:
126 return B110;
127 case 134:
128 return B134;
129 case 150:
130 return B150;
131 case 200:
132 return B200;
133 case 300:
134 return B300;
135 case 600:
136 return B600;
137 case 1200:
138 return B1200;
139 case 1800:
140 return B1800;
141 case 2400:
142 return B2400;
143 case 4800:
144 return B4800;
145 case 9600:
146 return B9600;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000147
148#ifdef B19200
Damien Miller95def091999-11-25 00:26:21 +1100149 case 19200:
150 return B19200;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000151#else /* B19200 */
152#ifdef EXTA
Damien Miller95def091999-11-25 00:26:21 +1100153 case 19200:
154 return EXTA;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000155#endif /* EXTA */
156#endif /* B19200 */
157
158#ifdef B38400
Damien Miller95def091999-11-25 00:26:21 +1100159 case 38400:
160 return B38400;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000161#else /* B38400 */
162#ifdef EXTB
Damien Miller95def091999-11-25 00:26:21 +1100163 case 38400:
164 return EXTB;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000165#endif /* EXTB */
166#endif /* B38400 */
167
168#ifdef B7200
Damien Miller95def091999-11-25 00:26:21 +1100169 case 7200:
170 return B7200;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000171#endif /* B7200 */
172#ifdef B14400
Damien Miller95def091999-11-25 00:26:21 +1100173 case 14400:
174 return B14400;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000175#endif /* B14400 */
176#ifdef B28800
Damien Miller95def091999-11-25 00:26:21 +1100177 case 28800:
178 return B28800;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000179#endif /* B28800 */
180#ifdef B57600
Damien Miller95def091999-11-25 00:26:21 +1100181 case 57600:
182 return B57600;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000183#endif /* B57600 */
184#ifdef B76800
Damien Miller95def091999-11-25 00:26:21 +1100185 case 76800:
186 return B76800;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000187#endif /* B76800 */
188#ifdef B115200
Damien Miller95def091999-11-25 00:26:21 +1100189 case 115200:
190 return B115200;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000191#endif /* B115200 */
192#ifdef B230400
Damien Miller95def091999-11-25 00:26:21 +1100193 case 230400:
194 return B230400;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000195#endif /* B230400 */
Damien Miller95def091999-11-25 00:26:21 +1100196 default:
197 return B9600;
198 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000199}
200
Damien Miller95def091999-11-25 00:26:21 +1100201/*
202 * Encodes terminal modes for the terminal referenced by fd
203 * in a portable manner, and appends the modes to a packet
204 * being constructed.
205 */
Damien Miller4af51302000-04-16 11:18:38 +1000206void
Damien Miller95def091999-11-25 00:26:21 +1100207tty_make_modes(int fd)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000208{
Damien Miller95def091999-11-25 00:26:21 +1100209 struct termios tio;
210 int baud;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000211
Damien Miller95def091999-11-25 00:26:21 +1100212 if (tcgetattr(fd, &tio) < 0) {
213 packet_put_char(TTY_OP_END);
214 log("tcgetattr: %.100s", strerror(errno));
215 return;
216 }
217 /* Store input and output baud rates. */
218 baud = speed_to_baud(cfgetospeed(&tio));
219 packet_put_char(TTY_OP_OSPEED);
220 packet_put_int(baud);
221 baud = speed_to_baud(cfgetispeed(&tio));
222 packet_put_char(TTY_OP_ISPEED);
223 packet_put_int(baud);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000224
Damien Miller95def091999-11-25 00:26:21 +1100225 /* Store values of mode flags. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000226#define TTYCHAR(NAME, OP) \
227 packet_put_char(OP); packet_put_char(tio.c_cc[NAME]);
228#define TTYMODE(NAME, FIELD, OP) \
229 packet_put_char(OP); packet_put_char((tio.FIELD & NAME) != 0);
230#define SGTTYCHAR(NAME, OP)
231#define SGTTYMODE(NAME, FIELD, OP)
232#define SGTTYMODEN(NAME, FIELD, OP)
233
234#include "ttymodes.h"
235
236#undef TTYCHAR
237#undef TTYMODE
238#undef SGTTYCHAR
239#undef SGTTYMODE
240#undef SGTTYMODEN
241
Damien Miller95def091999-11-25 00:26:21 +1100242 /* Mark end of mode data. */
243 packet_put_char(TTY_OP_END);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000244}
245
Damien Miller95def091999-11-25 00:26:21 +1100246/*
247 * Decodes terminal modes for the terminal referenced by fd in a portable
248 * manner from a packet being read.
249 */
Damien Miller4af51302000-04-16 11:18:38 +1000250void
Damien Miller95def091999-11-25 00:26:21 +1100251tty_parse_modes(int fd, int *n_bytes_ptr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000252{
Damien Miller95def091999-11-25 00:26:21 +1100253 struct termios tio;
254 int opcode, baud;
255 int n_bytes = 0;
256 int failure = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000257
Damien Miller95def091999-11-25 00:26:21 +1100258 /*
259 * Get old attributes for the terminal. We will modify these
260 * flags. I am hoping that if there are any machine-specific
261 * modes, they will initially have reasonable values.
262 */
263 if (tcgetattr(fd, &tio) < 0)
264 failure = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000265
Damien Miller95def091999-11-25 00:26:21 +1100266 for (;;) {
267 n_bytes += 1;
268 opcode = packet_get_char();
269 switch (opcode) {
270 case TTY_OP_END:
271 goto set;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000272
Damien Miller95def091999-11-25 00:26:21 +1100273 case TTY_OP_ISPEED:
274 n_bytes += 4;
275 baud = packet_get_int();
276 if (failure != -1 && cfsetispeed(&tio, baud_to_speed(baud)) < 0)
277 error("cfsetispeed failed for %d", baud);
278 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000279
Damien Miller95def091999-11-25 00:26:21 +1100280 case TTY_OP_OSPEED:
281 n_bytes += 4;
282 baud = packet_get_int();
283 if (failure != -1 && cfsetospeed(&tio, baud_to_speed(baud)) < 0)
284 error("cfsetospeed failed for %d", baud);
285 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000286
287#define TTYCHAR(NAME, OP) \
288 case OP: \
289 n_bytes += 1; \
290 tio.c_cc[NAME] = packet_get_char(); \
291 break;
292#define TTYMODE(NAME, FIELD, OP) \
293 case OP: \
294 n_bytes += 1; \
295 if (packet_get_char()) \
296 tio.FIELD |= NAME; \
297 else \
298 tio.FIELD &= ~NAME; \
299 break;
300#define SGTTYCHAR(NAME, OP)
301#define SGTTYMODE(NAME, FIELD, OP)
302#define SGTTYMODEN(NAME, FIELD, OP)
303
304#include "ttymodes.h"
305
306#undef TTYCHAR
307#undef TTYMODE
308#undef SGTTYCHAR
309#undef SGTTYMODE
310#undef SGTTYMODEN
311
Damien Miller95def091999-11-25 00:26:21 +1100312 default:
313 debug("Ignoring unsupported tty mode opcode %d (0x%x)",
314 opcode, opcode);
315 /*
316 * Opcodes 0 to 127 are defined to have
317 * a one-byte argument.
318 */
319 if (opcode >= 0 && opcode < 128) {
320 n_bytes += 1;
321 (void) packet_get_char();
322 break;
323 } else {
324 /*
325 * Opcodes 128 to 159 are defined to have
326 * an integer argument.
327 */
328 if (opcode >= 128 && opcode < 160) {
329 n_bytes += 4;
330 (void) packet_get_int();
331 break;
332 }
333 }
334 /*
335 * It is a truly undefined opcode (160 to 255).
336 * We have no idea about its arguments. So we
337 * must stop parsing. Note that some data may be
338 * left in the packet; hopefully there is nothing
339 * more coming after the mode data.
340 */
341 log("parse_tty_modes: unknown opcode %d", opcode);
342 packet_integrity_check(0, 1, SSH_CMSG_REQUEST_PTY);
343 goto set;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000344 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000345 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000346
Damien Miller95def091999-11-25 00:26:21 +1100347set:
348 if (*n_bytes_ptr != n_bytes) {
349 *n_bytes_ptr = n_bytes;
350 return; /* Don't process bytes passed */
351 }
352 if (failure == -1)
353 return; /* Packet parsed ok but tty stuff failed */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000354
Damien Miller95def091999-11-25 00:26:21 +1100355 /* Set the new modes for the terminal. */
356 if (tcsetattr(fd, TCSANOW, &tio) < 0)
357 log("Setting tty modes failed: %.100s", strerror(errno));
358 return;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000359}