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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5260325f | 5 | * Encoding and decoding of terminal modes in a portable way. |
6 | * Much of the format is defined in ttymodes.h; it is included multiple times | |
7 | * into this file with the appropriate macro definitions to generate the | |
8 | * suitable code. | |
bcbf86ec | 9 | * |
10 | * As far as I am concerned, the code I have written for this software | |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
5260325f | 15 | */ |
8efc0c15 | 16 | |
17 | #include "includes.h" | |
42f11eb2 | 18 | RCSID("$OpenBSD: ttymodes.c,v 1.10 2001/01/21 19:06:01 markus Exp $"); |
8efc0c15 | 19 | |
20 | #include "packet.h" | |
42f11eb2 | 21 | #include "log.h" |
22 | #include "ssh1.h" | |
8efc0c15 | 23 | |
24 | #define TTY_OP_END 0 | |
5260325f | 25 | #define TTY_OP_ISPEED 192 /* int follows */ |
26 | #define TTY_OP_OSPEED 193 /* int follows */ | |
8efc0c15 | 27 | |
5260325f | 28 | /* |
29 | * Converts POSIX speed_t to a baud rate. The values of the | |
30 | * constants for speed_t are not themselves portable. | |
31 | */ | |
6ae2364d | 32 | static int |
5260325f | 33 | speed_to_baud(speed_t speed) |
8efc0c15 | 34 | { |
5260325f | 35 | switch (speed) { |
36 | case B0: | |
37 | return 0; | |
38 | case B50: | |
39 | return 50; | |
40 | case B75: | |
41 | return 75; | |
42 | case B110: | |
43 | return 110; | |
44 | case B134: | |
45 | return 134; | |
46 | case B150: | |
47 | return 150; | |
48 | case B200: | |
49 | return 200; | |
50 | case B300: | |
51 | return 300; | |
52 | case B600: | |
53 | return 600; | |
54 | case B1200: | |
55 | return 1200; | |
56 | case B1800: | |
57 | return 1800; | |
58 | case B2400: | |
59 | return 2400; | |
60 | case B4800: | |
61 | return 4800; | |
62 | case B9600: | |
63 | return 9600; | |
8efc0c15 | 64 | |
65 | #ifdef B19200 | |
5260325f | 66 | case B19200: |
67 | return 19200; | |
8efc0c15 | 68 | #else /* B19200 */ |
69 | #ifdef EXTA | |
5260325f | 70 | case EXTA: |
71 | return 19200; | |
8efc0c15 | 72 | #endif /* EXTA */ |
73 | #endif /* B19200 */ | |
74 | ||
75 | #ifdef B38400 | |
5260325f | 76 | case B38400: |
77 | return 38400; | |
8efc0c15 | 78 | #else /* B38400 */ |
79 | #ifdef EXTB | |
5260325f | 80 | case EXTB: |
81 | return 38400; | |
8efc0c15 | 82 | #endif /* EXTB */ |
83 | #endif /* B38400 */ | |
84 | ||
85 | #ifdef B7200 | |
5260325f | 86 | case B7200: |
87 | return 7200; | |
8efc0c15 | 88 | #endif /* B7200 */ |
89 | #ifdef B14400 | |
5260325f | 90 | case B14400: |
91 | return 14400; | |
8efc0c15 | 92 | #endif /* B14400 */ |
93 | #ifdef B28800 | |
5260325f | 94 | case B28800: |
95 | return 28800; | |
8efc0c15 | 96 | #endif /* B28800 */ |
97 | #ifdef B57600 | |
5260325f | 98 | case B57600: |
99 | return 57600; | |
8efc0c15 | 100 | #endif /* B57600 */ |
101 | #ifdef B76800 | |
5260325f | 102 | case B76800: |
103 | return 76800; | |
8efc0c15 | 104 | #endif /* B76800 */ |
105 | #ifdef B115200 | |
5260325f | 106 | case B115200: |
107 | return 115200; | |
8efc0c15 | 108 | #endif /* B115200 */ |
109 | #ifdef B230400 | |
5260325f | 110 | case B230400: |
111 | return 230400; | |
8efc0c15 | 112 | #endif /* B230400 */ |
5260325f | 113 | default: |
114 | return 9600; | |
115 | } | |
8efc0c15 | 116 | } |
117 | ||
5260325f | 118 | /* |
119 | * Converts a numeric baud rate to a POSIX speed_t. | |
120 | */ | |
6ae2364d | 121 | static speed_t |
5260325f | 122 | baud_to_speed(int baud) |
8efc0c15 | 123 | { |
5260325f | 124 | switch (baud) { |
125 | case 0: | |
126 | return B0; | |
127 | case 50: | |
128 | return B50; | |
129 | case 75: | |
130 | return B75; | |
131 | case 110: | |
132 | return B110; | |
133 | case 134: | |
134 | return B134; | |
135 | case 150: | |
136 | return B150; | |
137 | case 200: | |
138 | return B200; | |
139 | case 300: | |
140 | return B300; | |
141 | case 600: | |
142 | return B600; | |
143 | case 1200: | |
144 | return B1200; | |
145 | case 1800: | |
146 | return B1800; | |
147 | case 2400: | |
148 | return B2400; | |
149 | case 4800: | |
150 | return B4800; | |
151 | case 9600: | |
152 | return B9600; | |
8efc0c15 | 153 | |
154 | #ifdef B19200 | |
5260325f | 155 | case 19200: |
156 | return B19200; | |
8efc0c15 | 157 | #else /* B19200 */ |
158 | #ifdef EXTA | |
5260325f | 159 | case 19200: |
160 | return EXTA; | |
8efc0c15 | 161 | #endif /* EXTA */ |
162 | #endif /* B19200 */ | |
163 | ||
164 | #ifdef B38400 | |
5260325f | 165 | case 38400: |
166 | return B38400; | |
8efc0c15 | 167 | #else /* B38400 */ |
168 | #ifdef EXTB | |
5260325f | 169 | case 38400: |
170 | return EXTB; | |
8efc0c15 | 171 | #endif /* EXTB */ |
172 | #endif /* B38400 */ | |
173 | ||
174 | #ifdef B7200 | |
5260325f | 175 | case 7200: |
176 | return B7200; | |
8efc0c15 | 177 | #endif /* B7200 */ |
178 | #ifdef B14400 | |
5260325f | 179 | case 14400: |
180 | return B14400; | |
8efc0c15 | 181 | #endif /* B14400 */ |
182 | #ifdef B28800 | |
5260325f | 183 | case 28800: |
184 | return B28800; | |
8efc0c15 | 185 | #endif /* B28800 */ |
186 | #ifdef B57600 | |
5260325f | 187 | case 57600: |
188 | return B57600; | |
8efc0c15 | 189 | #endif /* B57600 */ |
190 | #ifdef B76800 | |
5260325f | 191 | case 76800: |
192 | return B76800; | |
8efc0c15 | 193 | #endif /* B76800 */ |
194 | #ifdef B115200 | |
5260325f | 195 | case 115200: |
196 | return B115200; | |
8efc0c15 | 197 | #endif /* B115200 */ |
198 | #ifdef B230400 | |
5260325f | 199 | case 230400: |
200 | return B230400; | |
8efc0c15 | 201 | #endif /* B230400 */ |
5260325f | 202 | default: |
203 | return B9600; | |
204 | } | |
8efc0c15 | 205 | } |
206 | ||
5260325f | 207 | /* |
208 | * Encodes terminal modes for the terminal referenced by fd | |
209 | * in a portable manner, and appends the modes to a packet | |
210 | * being constructed. | |
211 | */ | |
6ae2364d | 212 | void |
5260325f | 213 | tty_make_modes(int fd) |
8efc0c15 | 214 | { |
5260325f | 215 | struct termios tio; |
216 | int baud; | |
217 | ||
5260325f | 218 | if (tcgetattr(fd, &tio) < 0) { |
219 | packet_put_char(TTY_OP_END); | |
220 | log("tcgetattr: %.100s", strerror(errno)); | |
221 | return; | |
222 | } | |
223 | /* Store input and output baud rates. */ | |
224 | baud = speed_to_baud(cfgetospeed(&tio)); | |
225 | packet_put_char(TTY_OP_OSPEED); | |
226 | packet_put_int(baud); | |
227 | baud = speed_to_baud(cfgetispeed(&tio)); | |
228 | packet_put_char(TTY_OP_ISPEED); | |
229 | packet_put_int(baud); | |
230 | ||
231 | /* Store values of mode flags. */ | |
8efc0c15 | 232 | #define TTYCHAR(NAME, OP) \ |
233 | packet_put_char(OP); packet_put_char(tio.c_cc[NAME]); | |
234 | #define TTYMODE(NAME, FIELD, OP) \ | |
235 | packet_put_char(OP); packet_put_char((tio.FIELD & NAME) != 0); | |
236 | #define SGTTYCHAR(NAME, OP) | |
237 | #define SGTTYMODE(NAME, FIELD, OP) | |
238 | #define SGTTYMODEN(NAME, FIELD, OP) | |
239 | ||
240 | #include "ttymodes.h" | |
241 | ||
242 | #undef TTYCHAR | |
243 | #undef TTYMODE | |
244 | #undef SGTTYCHAR | |
245 | #undef SGTTYMODE | |
246 | #undef SGTTYMODEN | |
247 | ||
5260325f | 248 | /* Mark end of mode data. */ |
249 | packet_put_char(TTY_OP_END); | |
8efc0c15 | 250 | } |
251 | ||
5260325f | 252 | /* |
253 | * Decodes terminal modes for the terminal referenced by fd in a portable | |
254 | * manner from a packet being read. | |
255 | */ | |
6ae2364d | 256 | void |
5260325f | 257 | tty_parse_modes(int fd, int *n_bytes_ptr) |
8efc0c15 | 258 | { |
5260325f | 259 | struct termios tio; |
260 | int opcode, baud; | |
261 | int n_bytes = 0; | |
262 | int failure = 0; | |
263 | ||
264 | /* | |
265 | * Get old attributes for the terminal. We will modify these | |
266 | * flags. I am hoping that if there are any machine-specific | |
267 | * modes, they will initially have reasonable values. | |
268 | */ | |
269 | if (tcgetattr(fd, &tio) < 0) | |
270 | failure = -1; | |
271 | ||
272 | for (;;) { | |
273 | n_bytes += 1; | |
274 | opcode = packet_get_char(); | |
275 | switch (opcode) { | |
276 | case TTY_OP_END: | |
277 | goto set; | |
278 | ||
279 | case TTY_OP_ISPEED: | |
280 | n_bytes += 4; | |
281 | baud = packet_get_int(); | |
282 | if (failure != -1 && cfsetispeed(&tio, baud_to_speed(baud)) < 0) | |
283 | error("cfsetispeed failed for %d", baud); | |
284 | break; | |
285 | ||
286 | case TTY_OP_OSPEED: | |
287 | n_bytes += 4; | |
288 | baud = packet_get_int(); | |
289 | if (failure != -1 && cfsetospeed(&tio, baud_to_speed(baud)) < 0) | |
290 | error("cfsetospeed failed for %d", baud); | |
291 | break; | |
8efc0c15 | 292 | |
293 | #define TTYCHAR(NAME, OP) \ | |
294 | case OP: \ | |
295 | n_bytes += 1; \ | |
296 | tio.c_cc[NAME] = packet_get_char(); \ | |
297 | break; | |
298 | #define TTYMODE(NAME, FIELD, OP) \ | |
299 | case OP: \ | |
300 | n_bytes += 1; \ | |
301 | if (packet_get_char()) \ | |
302 | tio.FIELD |= NAME; \ | |
303 | else \ | |
304 | tio.FIELD &= ~NAME; \ | |
305 | break; | |
306 | #define SGTTYCHAR(NAME, OP) | |
307 | #define SGTTYMODE(NAME, FIELD, OP) | |
308 | #define SGTTYMODEN(NAME, FIELD, OP) | |
309 | ||
310 | #include "ttymodes.h" | |
311 | ||
312 | #undef TTYCHAR | |
313 | #undef TTYMODE | |
314 | #undef SGTTYCHAR | |
315 | #undef SGTTYMODE | |
316 | #undef SGTTYMODEN | |
317 | ||
5260325f | 318 | default: |
319 | debug("Ignoring unsupported tty mode opcode %d (0x%x)", | |
320 | opcode, opcode); | |
321 | /* | |
322 | * Opcodes 0 to 127 are defined to have | |
323 | * a one-byte argument. | |
324 | */ | |
325 | if (opcode >= 0 && opcode < 128) { | |
326 | n_bytes += 1; | |
327 | (void) packet_get_char(); | |
328 | break; | |
329 | } else { | |
330 | /* | |
331 | * Opcodes 128 to 159 are defined to have | |
332 | * an integer argument. | |
333 | */ | |
334 | if (opcode >= 128 && opcode < 160) { | |
335 | n_bytes += 4; | |
336 | (void) packet_get_int(); | |
337 | break; | |
338 | } | |
339 | } | |
340 | /* | |
341 | * It is a truly undefined opcode (160 to 255). | |
342 | * We have no idea about its arguments. So we | |
343 | * must stop parsing. Note that some data may be | |
344 | * left in the packet; hopefully there is nothing | |
345 | * more coming after the mode data. | |
346 | */ | |
347 | log("parse_tty_modes: unknown opcode %d", opcode); | |
348 | packet_integrity_check(0, 1, SSH_CMSG_REQUEST_PTY); | |
349 | goto set; | |
8efc0c15 | 350 | } |
8efc0c15 | 351 | } |
8efc0c15 | 352 | |
5260325f | 353 | set: |
354 | if (*n_bytes_ptr != n_bytes) { | |
355 | *n_bytes_ptr = n_bytes; | |
356 | return; /* Don't process bytes passed */ | |
357 | } | |
358 | if (failure == -1) | |
359 | return; /* Packet parsed ok but tty stuff failed */ | |
8efc0c15 | 360 | |
5260325f | 361 | /* Set the new modes for the terminal. */ |
362 | if (tcsetattr(fd, TCSANOW, &tio) < 0) | |
363 | log("Setting tty modes failed: %.100s", strerror(errno)); | |
364 | return; | |
8efc0c15 | 365 | } |