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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 | * 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 | */ | |
11 | ||
12 | #include "includes.h" | |
13 | RCSID("$Id$"); | |
14 | ||
15 | #include "packet.h" | |
16 | #include "ssh.h" | |
17 | ||
18 | #define TTY_OP_END 0 | |
19 | #define TTY_OP_ISPEED 192 /* int follows */ | |
20 | #define TTY_OP_OSPEED 193 /* int follows */ | |
21 | ||
22 | /* | |
23 | * Converts POSIX speed_t to a baud rate. The values of the | |
24 | * constants for speed_t are not themselves portable. | |
25 | */ | |
26 | static int | |
27 | speed_to_baud(speed_t speed) | |
28 | { | |
29 | 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; | |
58 | ||
59 | #ifdef B19200 | |
60 | case B19200: | |
61 | return 19200; | |
62 | #else /* B19200 */ | |
63 | #ifdef EXTA | |
64 | case EXTA: | |
65 | return 19200; | |
66 | #endif /* EXTA */ | |
67 | #endif /* B19200 */ | |
68 | ||
69 | #ifdef B38400 | |
70 | case B38400: | |
71 | return 38400; | |
72 | #else /* B38400 */ | |
73 | #ifdef EXTB | |
74 | case EXTB: | |
75 | return 38400; | |
76 | #endif /* EXTB */ | |
77 | #endif /* B38400 */ | |
78 | ||
79 | #ifdef B7200 | |
80 | case B7200: | |
81 | return 7200; | |
82 | #endif /* B7200 */ | |
83 | #ifdef B14400 | |
84 | case B14400: | |
85 | return 14400; | |
86 | #endif /* B14400 */ | |
87 | #ifdef B28800 | |
88 | case B28800: | |
89 | return 28800; | |
90 | #endif /* B28800 */ | |
91 | #ifdef B57600 | |
92 | case B57600: | |
93 | return 57600; | |
94 | #endif /* B57600 */ | |
95 | #ifdef B76800 | |
96 | case B76800: | |
97 | return 76800; | |
98 | #endif /* B76800 */ | |
99 | #ifdef B115200 | |
100 | case B115200: | |
101 | return 115200; | |
102 | #endif /* B115200 */ | |
103 | #ifdef B230400 | |
104 | case B230400: | |
105 | return 230400; | |
106 | #endif /* B230400 */ | |
107 | default: | |
108 | return 9600; | |
109 | } | |
110 | } | |
111 | ||
112 | /* | |
113 | * Converts a numeric baud rate to a POSIX speed_t. | |
114 | */ | |
115 | static speed_t | |
116 | baud_to_speed(int baud) | |
117 | { | |
118 | 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; | |
147 | ||
148 | #ifdef B19200 | |
149 | case 19200: | |
150 | return B19200; | |
151 | #else /* B19200 */ | |
152 | #ifdef EXTA | |
153 | case 19200: | |
154 | return EXTA; | |
155 | #endif /* EXTA */ | |
156 | #endif /* B19200 */ | |
157 | ||
158 | #ifdef B38400 | |
159 | case 38400: | |
160 | return B38400; | |
161 | #else /* B38400 */ | |
162 | #ifdef EXTB | |
163 | case 38400: | |
164 | return EXTB; | |
165 | #endif /* EXTB */ | |
166 | #endif /* B38400 */ | |
167 | ||
168 | #ifdef B7200 | |
169 | case 7200: | |
170 | return B7200; | |
171 | #endif /* B7200 */ | |
172 | #ifdef B14400 | |
173 | case 14400: | |
174 | return B14400; | |
175 | #endif /* B14400 */ | |
176 | #ifdef B28800 | |
177 | case 28800: | |
178 | return B28800; | |
179 | #endif /* B28800 */ | |
180 | #ifdef B57600 | |
181 | case 57600: | |
182 | return B57600; | |
183 | #endif /* B57600 */ | |
184 | #ifdef B76800 | |
185 | case 76800: | |
186 | return B76800; | |
187 | #endif /* B76800 */ | |
188 | #ifdef B115200 | |
189 | case 115200: | |
190 | return B115200; | |
191 | #endif /* B115200 */ | |
192 | #ifdef B230400 | |
193 | case 230400: | |
194 | return B230400; | |
195 | #endif /* B230400 */ | |
196 | default: | |
197 | return B9600; | |
198 | } | |
199 | } | |
200 | ||
201 | /* | |
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 | */ | |
206 | void | |
207 | tty_make_modes(int fd) | |
208 | { | |
209 | struct termios tio; | |
210 | int baud; | |
211 | ||
212 | 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); | |
224 | ||
225 | /* Store values of mode flags. */ | |
226 | #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 | ||
242 | /* Mark end of mode data. */ | |
243 | packet_put_char(TTY_OP_END); | |
244 | } | |
245 | ||
246 | /* | |
247 | * Decodes terminal modes for the terminal referenced by fd in a portable | |
248 | * manner from a packet being read. | |
249 | */ | |
250 | void | |
251 | tty_parse_modes(int fd, int *n_bytes_ptr) | |
252 | { | |
253 | struct termios tio; | |
254 | int opcode, baud; | |
255 | int n_bytes = 0; | |
256 | int failure = 0; | |
257 | ||
258 | /* | |
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; | |
265 | ||
266 | for (;;) { | |
267 | n_bytes += 1; | |
268 | opcode = packet_get_char(); | |
269 | switch (opcode) { | |
270 | case TTY_OP_END: | |
271 | goto set; | |
272 | ||
273 | 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; | |
279 | ||
280 | 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; | |
286 | ||
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 | ||
312 | 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; | |
344 | } | |
345 | } | |
346 | ||
347 | set: | |
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 */ | |
354 | ||
355 | /* 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; | |
359 | } |