Annotation of src/usr.bin/ssh/ttymodes.c, Revision 1.3
1.1 deraadt 1: /*
2:
3: ttymodes.c
4:
5: Author: Tatu Ylonen <ylo@cs.hut.fi>
6:
7: Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8: All rights reserved
9:
10: Created: Tue Mar 21 15:59:15 1995 ylo
11:
12: Encoding and decoding of terminal modes in a portable way.
13: Much of the format is defined in ttymodes.h; it is included multiple times
14: into this file with the appropriate macro definitions to generate the
15: suitable code.
16:
17: */
18:
19: #include "includes.h"
1.3 ! markus 20: RCSID("$Id: ttymodes.c,v 1.2 1999/09/30 05:03:05 deraadt Exp $");
1.1 deraadt 21:
22: #include "packet.h"
23: #include "ssh.h"
24:
25: #define TTY_OP_END 0
1.3 ! markus 26: #define TTY_OP_ISPEED 192 /* int follows */
! 27: #define TTY_OP_OSPEED 193 /* int follows */
1.1 deraadt 28:
29: /* Converts POSIX speed_t to a baud rate. The values of the constants
30: for speed_t are not themselves portable. */
31:
1.3 ! markus 32: static int
! 33: speed_to_baud(speed_t speed)
1.1 deraadt 34: {
1.3 ! markus 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;
1.1 deraadt 64:
65: #ifdef B19200
1.3 ! markus 66: case B19200:
! 67: return 19200;
1.1 deraadt 68: #else /* B19200 */
69: #ifdef EXTA
1.3 ! markus 70: case EXTA:
! 71: return 19200;
1.1 deraadt 72: #endif /* EXTA */
73: #endif /* B19200 */
74:
75: #ifdef B38400
1.3 ! markus 76: case B38400:
! 77: return 38400;
1.1 deraadt 78: #else /* B38400 */
79: #ifdef EXTB
1.3 ! markus 80: case EXTB:
! 81: return 38400;
1.1 deraadt 82: #endif /* EXTB */
83: #endif /* B38400 */
84:
85: #ifdef B7200
1.3 ! markus 86: case B7200:
! 87: return 7200;
1.1 deraadt 88: #endif /* B7200 */
89: #ifdef B14400
1.3 ! markus 90: case B14400:
! 91: return 14400;
1.1 deraadt 92: #endif /* B14400 */
93: #ifdef B28800
1.3 ! markus 94: case B28800:
! 95: return 28800;
1.1 deraadt 96: #endif /* B28800 */
97: #ifdef B57600
1.3 ! markus 98: case B57600:
! 99: return 57600;
1.1 deraadt 100: #endif /* B57600 */
101: #ifdef B76800
1.3 ! markus 102: case B76800:
! 103: return 76800;
1.1 deraadt 104: #endif /* B76800 */
105: #ifdef B115200
1.3 ! markus 106: case B115200:
! 107: return 115200;
1.1 deraadt 108: #endif /* B115200 */
109: #ifdef B230400
1.3 ! markus 110: case B230400:
! 111: return 230400;
1.1 deraadt 112: #endif /* B230400 */
1.3 ! markus 113: default:
! 114: return 9600;
! 115: }
1.1 deraadt 116: }
117:
118: /* Converts a numeric baud rate to a POSIX speed_t. */
119:
1.3 ! markus 120: static speed_t
! 121: baud_to_speed(int baud)
1.1 deraadt 122: {
1.3 ! markus 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;
1.1 deraadt 152:
153: #ifdef B19200
1.3 ! markus 154: case 19200:
! 155: return B19200;
1.1 deraadt 156: #else /* B19200 */
157: #ifdef EXTA
1.3 ! markus 158: case 19200:
! 159: return EXTA;
1.1 deraadt 160: #endif /* EXTA */
161: #endif /* B19200 */
162:
163: #ifdef B38400
1.3 ! markus 164: case 38400:
! 165: return B38400;
1.1 deraadt 166: #else /* B38400 */
167: #ifdef EXTB
1.3 ! markus 168: case 38400:
! 169: return EXTB;
1.1 deraadt 170: #endif /* EXTB */
171: #endif /* B38400 */
172:
173: #ifdef B7200
1.3 ! markus 174: case 7200:
! 175: return B7200;
1.1 deraadt 176: #endif /* B7200 */
177: #ifdef B14400
1.3 ! markus 178: case 14400:
! 179: return B14400;
1.1 deraadt 180: #endif /* B14400 */
181: #ifdef B28800
1.3 ! markus 182: case 28800:
! 183: return B28800;
1.1 deraadt 184: #endif /* B28800 */
185: #ifdef B57600
1.3 ! markus 186: case 57600:
! 187: return B57600;
1.1 deraadt 188: #endif /* B57600 */
189: #ifdef B76800
1.3 ! markus 190: case 76800:
! 191: return B76800;
1.1 deraadt 192: #endif /* B76800 */
193: #ifdef B115200
1.3 ! markus 194: case 115200:
! 195: return B115200;
1.1 deraadt 196: #endif /* B115200 */
197: #ifdef B230400
1.3 ! markus 198: case 230400:
! 199: return B230400;
1.1 deraadt 200: #endif /* B230400 */
1.3 ! markus 201: default:
! 202: return B9600;
! 203: }
1.1 deraadt 204: }
205:
206: /* Encodes terminal modes for the terminal referenced by fd in a portable
207: manner, and appends the modes to a packet being constructed. */
208:
1.3 ! markus 209: void
! 210: tty_make_modes(int fd)
1.1 deraadt 211: {
1.3 ! markus 212: struct termios tio;
! 213: int baud;
1.1 deraadt 214:
1.3 ! markus 215: /* Get the modes. */
! 216: if (tcgetattr(fd, &tio) < 0) {
! 217: packet_put_char(TTY_OP_END);
! 218: log("tcgetattr: %.100s", strerror(errno));
! 219: return;
! 220: }
! 221: /* Store input and output baud rates. */
! 222: baud = speed_to_baud(cfgetospeed(&tio));
! 223: packet_put_char(TTY_OP_OSPEED);
! 224: packet_put_int(baud);
! 225: baud = speed_to_baud(cfgetispeed(&tio));
! 226: packet_put_char(TTY_OP_ISPEED);
! 227: packet_put_int(baud);
1.1 deraadt 228:
1.3 ! markus 229: /* Store values of mode flags. */
1.1 deraadt 230: #define TTYCHAR(NAME, OP) \
231: packet_put_char(OP); packet_put_char(tio.c_cc[NAME]);
232: #define TTYMODE(NAME, FIELD, OP) \
233: packet_put_char(OP); packet_put_char((tio.FIELD & NAME) != 0);
234: #define SGTTYCHAR(NAME, OP)
235: #define SGTTYMODE(NAME, FIELD, OP)
236: #define SGTTYMODEN(NAME, FIELD, OP)
237:
238: #include "ttymodes.h"
239:
240: #undef TTYCHAR
241: #undef TTYMODE
242: #undef SGTTYCHAR
243: #undef SGTTYMODE
244: #undef SGTTYMODEN
245:
1.3 ! markus 246: /* Mark end of mode data. */
! 247: packet_put_char(TTY_OP_END);
1.1 deraadt 248: }
249:
250: /* Decodes terminal modes for the terminal referenced by fd in a portable
251: manner from a packet being read. */
252:
1.3 ! markus 253: void
! 254: tty_parse_modes(int fd, int *n_bytes_ptr)
1.1 deraadt 255: {
1.3 ! markus 256: struct termios tio;
! 257: int opcode, baud;
! 258: int n_bytes = 0;
! 259: int failure = 0;
! 260:
! 261: /* Get old attributes for the terminal. We will modify these
! 262: flags. I am hoping that if there are any machine-specific
! 263: modes, they will initially have reasonable values. */
! 264: if (tcgetattr(fd, &tio) < 0)
! 265: failure = -1;
! 266:
! 267: for (;;) {
! 268: n_bytes += 1;
! 269: opcode = packet_get_char();
! 270: switch (opcode) {
! 271: case TTY_OP_END:
! 272: goto set;
! 273:
! 274: case TTY_OP_ISPEED:
! 275: n_bytes += 4;
! 276: baud = packet_get_int();
! 277: if (failure != -1 && cfsetispeed(&tio, baud_to_speed(baud)) < 0)
! 278: error("cfsetispeed failed for %d", baud);
! 279: break;
! 280:
! 281: case TTY_OP_OSPEED:
! 282: n_bytes += 4;
! 283: baud = packet_get_int();
! 284: if (failure != -1 && cfsetospeed(&tio, baud_to_speed(baud)) < 0)
! 285: error("cfsetospeed failed for %d", baud);
! 286: break;
1.1 deraadt 287:
288: #define TTYCHAR(NAME, OP) \
289: case OP: \
290: n_bytes += 1; \
291: tio.c_cc[NAME] = packet_get_char(); \
292: break;
293: #define TTYMODE(NAME, FIELD, OP) \
294: case OP: \
295: n_bytes += 1; \
296: if (packet_get_char()) \
297: tio.FIELD |= NAME; \
298: else \
299: tio.FIELD &= ~NAME; \
300: break;
301: #define SGTTYCHAR(NAME, OP)
302: #define SGTTYMODE(NAME, FIELD, OP)
303: #define SGTTYMODEN(NAME, FIELD, OP)
304:
305: #include "ttymodes.h"
306:
307: #undef TTYCHAR
308: #undef TTYMODE
309: #undef SGTTYCHAR
310: #undef SGTTYMODE
311: #undef SGTTYMODEN
312:
1.3 ! markus 313: default:
! 314: debug("Ignoring unsupported tty mode opcode %d (0x%x)",
! 315: opcode, opcode);
! 316: /* Opcodes 0 to 127 are defined to have a one-byte argument. */
! 317: if (opcode >= 0 && opcode < 128) {
! 318: n_bytes += 1;
! 319: (void) packet_get_char();
! 320: break;
! 321: } else {
! 322: /* Opcodes 128 to 159 are defined to have an integer argument. */
! 323: if (opcode >= 128 && opcode < 160) {
! 324: n_bytes += 4;
! 325: (void) packet_get_int();
! 326: break;
! 327: }
! 328: }
! 329: /* It is a truly undefined opcode (160 to 255).
! 330: We have no idea about its arguments. So we
! 331: must stop parsing. Note that some data may be
! 332: left in the packet; hopefully there is nothing
! 333: more coming after the mode data. */
! 334: log("parse_tty_modes: unknown opcode %d", opcode);
! 335: packet_integrity_check(0, 1, SSH_CMSG_REQUEST_PTY);
! 336: goto set;
1.1 deraadt 337: }
338: }
339:
1.3 ! markus 340: set:
! 341: if (*n_bytes_ptr != n_bytes) {
! 342: *n_bytes_ptr = n_bytes;
! 343: return; /* Don't process bytes passed */
! 344: }
! 345: if (failure == -1)
! 346: return; /* Packet parsed ok but tty stuff failed */
! 347:
! 348: /* Set the new modes for the terminal. */
! 349: if (tcsetattr(fd, TCSANOW, &tio) < 0)
! 350: log("Setting tty modes failed: %.100s", strerror(errno));
! 351: return;
1.1 deraadt 352: }
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