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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 | * 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. | |
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". | |
15 | */ | |
16 | ||
17 | #include "includes.h" | |
18 | RCSID("$OpenBSD: ttymodes.c,v 1.8 2000/09/07 20:27:55 deraadt Exp $"); | |
19 | ||
20 | #include "packet.h" | |
21 | #include "ssh.h" | |
22 | ||
23 | #define TTY_OP_END 0 | |
24 | #define TTY_OP_ISPEED 192 /* int follows */ | |
25 | #define TTY_OP_OSPEED 193 /* int follows */ | |
26 | ||
27 | /* | |
28 | * Converts POSIX speed_t to a baud rate. The values of the | |
29 | * constants for speed_t are not themselves portable. | |
30 | */ | |
31 | static int | |
32 | speed_to_baud(speed_t speed) | |
33 | { | |
34 | switch (speed) { | |
35 | case B0: | |
36 | return 0; | |
37 | case B50: | |
38 | return 50; | |
39 | case B75: | |
40 | return 75; | |
41 | case B110: | |
42 | return 110; | |
43 | case B134: | |
44 | return 134; | |
45 | case B150: | |
46 | return 150; | |
47 | case B200: | |
48 | return 200; | |
49 | case B300: | |
50 | return 300; | |
51 | case B600: | |
52 | return 600; | |
53 | case B1200: | |
54 | return 1200; | |
55 | case B1800: | |
56 | return 1800; | |
57 | case B2400: | |
58 | return 2400; | |
59 | case B4800: | |
60 | return 4800; | |
61 | case B9600: | |
62 | return 9600; | |
63 | ||
64 | #ifdef B19200 | |
65 | case B19200: | |
66 | return 19200; | |
67 | #else /* B19200 */ | |
68 | #ifdef EXTA | |
69 | case EXTA: | |
70 | return 19200; | |
71 | #endif /* EXTA */ | |
72 | #endif /* B19200 */ | |
73 | ||
74 | #ifdef B38400 | |
75 | case B38400: | |
76 | return 38400; | |
77 | #else /* B38400 */ | |
78 | #ifdef EXTB | |
79 | case EXTB: | |
80 | return 38400; | |
81 | #endif /* EXTB */ | |
82 | #endif /* B38400 */ | |
83 | ||
84 | #ifdef B7200 | |
85 | case B7200: | |
86 | return 7200; | |
87 | #endif /* B7200 */ | |
88 | #ifdef B14400 | |
89 | case B14400: | |
90 | return 14400; | |
91 | #endif /* B14400 */ | |
92 | #ifdef B28800 | |
93 | case B28800: | |
94 | return 28800; | |
95 | #endif /* B28800 */ | |
96 | #ifdef B57600 | |
97 | case B57600: | |
98 | return 57600; | |
99 | #endif /* B57600 */ | |
100 | #ifdef B76800 | |
101 | case B76800: | |
102 | return 76800; | |
103 | #endif /* B76800 */ | |
104 | #ifdef B115200 | |
105 | case B115200: | |
106 | return 115200; | |
107 | #endif /* B115200 */ | |
108 | #ifdef B230400 | |
109 | case B230400: | |
110 | return 230400; | |
111 | #endif /* B230400 */ | |
112 | default: | |
113 | return 9600; | |
114 | } | |
115 | } | |
116 | ||
117 | /* | |
118 | * Converts a numeric baud rate to a POSIX speed_t. | |
119 | */ | |
120 | static speed_t | |
121 | baud_to_speed(int baud) | |
122 | { | |
123 | switch (baud) { | |
124 | case 0: | |
125 | return B0; | |
126 | case 50: | |
127 | return B50; | |
128 | case 75: | |
129 | return B75; | |
130 | case 110: | |
131 | return B110; | |
132 | case 134: | |
133 | return B134; | |
134 | case 150: | |
135 | return B150; | |
136 | case 200: | |
137 | return B200; | |
138 | case 300: | |
139 | return B300; | |
140 | case 600: | |
141 | return B600; | |
142 | case 1200: | |
143 | return B1200; | |
144 | case 1800: | |
145 | return B1800; | |
146 | case 2400: | |
147 | return B2400; | |
148 | case 4800: | |
149 | return B4800; | |
150 | case 9600: | |
151 | return B9600; | |
152 | ||
153 | #ifdef B19200 | |
154 | case 19200: | |
155 | return B19200; | |
156 | #else /* B19200 */ | |
157 | #ifdef EXTA | |
158 | case 19200: | |
159 | return EXTA; | |
160 | #endif /* EXTA */ | |
161 | #endif /* B19200 */ | |
162 | ||
163 | #ifdef B38400 | |
164 | case 38400: | |
165 | return B38400; | |
166 | #else /* B38400 */ | |
167 | #ifdef EXTB | |
168 | case 38400: | |
169 | return EXTB; | |
170 | #endif /* EXTB */ | |
171 | #endif /* B38400 */ | |
172 | ||
173 | #ifdef B7200 | |
174 | case 7200: | |
175 | return B7200; | |
176 | #endif /* B7200 */ | |
177 | #ifdef B14400 | |
178 | case 14400: | |
179 | return B14400; | |
180 | #endif /* B14400 */ | |
181 | #ifdef B28800 | |
182 | case 28800: | |
183 | return B28800; | |
184 | #endif /* B28800 */ | |
185 | #ifdef B57600 | |
186 | case 57600: | |
187 | return B57600; | |
188 | #endif /* B57600 */ | |
189 | #ifdef B76800 | |
190 | case 76800: | |
191 | return B76800; | |
192 | #endif /* B76800 */ | |
193 | #ifdef B115200 | |
194 | case 115200: | |
195 | return B115200; | |
196 | #endif /* B115200 */ | |
197 | #ifdef B230400 | |
198 | case 230400: | |
199 | return B230400; | |
200 | #endif /* B230400 */ | |
201 | default: | |
202 | return B9600; | |
203 | } | |
204 | } | |
205 | ||
206 | /* | |
207 | * Encodes terminal modes for the terminal referenced by fd | |
208 | * in a portable manner, and appends the modes to a packet | |
209 | * being constructed. | |
210 | */ | |
211 | void | |
212 | tty_make_modes(int fd) | |
213 | { | |
214 | struct termios tio; | |
215 | int baud; | |
216 | ||
217 | if (tcgetattr(fd, &tio) < 0) { | |
218 | packet_put_char(TTY_OP_END); | |
219 | log("tcgetattr: %.100s", strerror(errno)); | |
220 | return; | |
221 | } | |
222 | /* Store input and output baud rates. */ | |
223 | baud = speed_to_baud(cfgetospeed(&tio)); | |
224 | packet_put_char(TTY_OP_OSPEED); | |
225 | packet_put_int(baud); | |
226 | baud = speed_to_baud(cfgetispeed(&tio)); | |
227 | packet_put_char(TTY_OP_ISPEED); | |
228 | packet_put_int(baud); | |
229 | ||
230 | /* Store values of mode flags. */ | |
231 | #define TTYCHAR(NAME, OP) \ | |
232 | packet_put_char(OP); packet_put_char(tio.c_cc[NAME]); | |
233 | #define TTYMODE(NAME, FIELD, OP) \ | |
234 | packet_put_char(OP); packet_put_char((tio.FIELD & NAME) != 0); | |
235 | #define SGTTYCHAR(NAME, OP) | |
236 | #define SGTTYMODE(NAME, FIELD, OP) | |
237 | #define SGTTYMODEN(NAME, FIELD, OP) | |
238 | ||
239 | #include "ttymodes.h" | |
240 | ||
241 | #undef TTYCHAR | |
242 | #undef TTYMODE | |
243 | #undef SGTTYCHAR | |
244 | #undef SGTTYMODE | |
245 | #undef SGTTYMODEN | |
246 | ||
247 | /* Mark end of mode data. */ | |
248 | packet_put_char(TTY_OP_END); | |
249 | } | |
250 | ||
251 | /* | |
252 | * Decodes terminal modes for the terminal referenced by fd in a portable | |
253 | * manner from a packet being read. | |
254 | */ | |
255 | void | |
256 | tty_parse_modes(int fd, int *n_bytes_ptr) | |
257 | { | |
258 | struct termios tio; | |
259 | int opcode, baud; | |
260 | int n_bytes = 0; | |
261 | int failure = 0; | |
262 | ||
263 | /* | |
264 | * Get old attributes for the terminal. We will modify these | |
265 | * flags. I am hoping that if there are any machine-specific | |
266 | * modes, they will initially have reasonable values. | |
267 | */ | |
268 | if (tcgetattr(fd, &tio) < 0) | |
269 | failure = -1; | |
270 | ||
271 | for (;;) { | |
272 | n_bytes += 1; | |
273 | opcode = packet_get_char(); | |
274 | switch (opcode) { | |
275 | case TTY_OP_END: | |
276 | goto set; | |
277 | ||
278 | case TTY_OP_ISPEED: | |
279 | n_bytes += 4; | |
280 | baud = packet_get_int(); | |
281 | if (failure != -1 && cfsetispeed(&tio, baud_to_speed(baud)) < 0) | |
282 | error("cfsetispeed failed for %d", baud); | |
283 | break; | |
284 | ||
285 | case TTY_OP_OSPEED: | |
286 | n_bytes += 4; | |
287 | baud = packet_get_int(); | |
288 | if (failure != -1 && cfsetospeed(&tio, baud_to_speed(baud)) < 0) | |
289 | error("cfsetospeed failed for %d", baud); | |
290 | break; | |
291 | ||
292 | #define TTYCHAR(NAME, OP) \ | |
293 | case OP: \ | |
294 | n_bytes += 1; \ | |
295 | tio.c_cc[NAME] = packet_get_char(); \ | |
296 | break; | |
297 | #define TTYMODE(NAME, FIELD, OP) \ | |
298 | case OP: \ | |
299 | n_bytes += 1; \ | |
300 | if (packet_get_char()) \ | |
301 | tio.FIELD |= NAME; \ | |
302 | else \ | |
303 | tio.FIELD &= ~NAME; \ | |
304 | break; | |
305 | #define SGTTYCHAR(NAME, OP) | |
306 | #define SGTTYMODE(NAME, FIELD, OP) | |
307 | #define SGTTYMODEN(NAME, FIELD, OP) | |
308 | ||
309 | #include "ttymodes.h" | |
310 | ||
311 | #undef TTYCHAR | |
312 | #undef TTYMODE | |
313 | #undef SGTTYCHAR | |
314 | #undef SGTTYMODE | |
315 | #undef SGTTYMODEN | |
316 | ||
317 | default: | |
318 | debug("Ignoring unsupported tty mode opcode %d (0x%x)", | |
319 | opcode, opcode); | |
320 | /* | |
321 | * Opcodes 0 to 127 are defined to have | |
322 | * a one-byte argument. | |
323 | */ | |
324 | if (opcode >= 0 && opcode < 128) { | |
325 | n_bytes += 1; | |
326 | (void) packet_get_char(); | |
327 | break; | |
328 | } else { | |
329 | /* | |
330 | * Opcodes 128 to 159 are defined to have | |
331 | * an integer argument. | |
332 | */ | |
333 | if (opcode >= 128 && opcode < 160) { | |
334 | n_bytes += 4; | |
335 | (void) packet_get_int(); | |
336 | break; | |
337 | } | |
338 | } | |
339 | /* | |
340 | * It is a truly undefined opcode (160 to 255). | |
341 | * We have no idea about its arguments. So we | |
342 | * must stop parsing. Note that some data may be | |
343 | * left in the packet; hopefully there is nothing | |
344 | * more coming after the mode data. | |
345 | */ | |
346 | log("parse_tty_modes: unknown opcode %d", opcode); | |
347 | packet_integrity_check(0, 1, SSH_CMSG_REQUEST_PTY); | |
348 | goto set; | |
349 | } | |
350 | } | |
351 | ||
352 | set: | |
353 | if (*n_bytes_ptr != n_bytes) { | |
354 | *n_bytes_ptr = n_bytes; | |
355 | return; /* Don't process bytes passed */ | |
356 | } | |
357 | if (failure == -1) | |
358 | return; /* Packet parsed ok but tty stuff failed */ | |
359 | ||
360 | /* Set the new modes for the terminal. */ | |
361 | if (tcsetattr(fd, TCSANOW, &tio) < 0) | |
362 | log("Setting tty modes failed: %.100s", strerror(errno)); | |
363 | return; | |
364 | } |