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authorDamien Miller <djm@mindrot.org>1999-10-27 13:42:43 +1000
committerDamien Miller <djm@mindrot.org>1999-10-27 13:42:43 +1000
commitd4a8b7e34dd619a4debf9a206c81db26d1402ea6 (patch)
treea47d770a2f790f40d18b0982d4e55fa7cfb1fa3b /ttymodes.c
Initial revision
Diffstat (limited to 'ttymodes.c')
-rw-r--r--ttymodes.c359
1 files changed, 359 insertions, 0 deletions
diff --git a/ttymodes.c b/ttymodes.c
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+/*
+
+ttymodes.c
+
+Author: Tatu Ylonen <ylo@cs.hut.fi>
+
+Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ All rights reserved
+
+Created: Tue Mar 21 15:59:15 1995 ylo
+
+Encoding and decoding of terminal modes in a portable way.
+Much of the format is defined in ttymodes.h; it is included multiple times
+into this file with the appropriate macro definitions to generate the
+suitable code.
+
+*/
+
+#include "includes.h"
+RCSID("$Id: ttymodes.c,v 1.1 1999/10/27 03:42:46 damien Exp $");
+
+#include "packet.h"
+#include "ssh.h"
+
+#define TTY_OP_END 0
+#define TTY_OP_ISPEED 192 /* int follows */
+#define TTY_OP_OSPEED 193 /* int follows */
+
+/* Converts POSIX speed_t to a baud rate. The values of the constants
+ for speed_t are not themselves portable. */
+
+static int speed_to_baud(speed_t speed)
+{
+ switch (speed)
+ {
+ case B0:
+ return 0;
+ case B50:
+ return 50;
+ case B75:
+ return 75;
+ case B110:
+ return 110;
+ case B134:
+ return 134;
+ case B150:
+ return 150;
+ case B200:
+ return 200;
+ case B300:
+ return 300;
+ case B600:
+ return 600;
+ case B1200:
+ return 1200;
+ case B1800:
+ return 1800;
+ case B2400:
+ return 2400;
+ case B4800:
+ return 4800;
+ case B9600:
+ return 9600;
+
+#ifdef B19200
+ case B19200:
+ return 19200;
+#else /* B19200 */
+#ifdef EXTA
+ case EXTA:
+ return 19200;
+#endif /* EXTA */
+#endif /* B19200 */
+
+#ifdef B38400
+ case B38400:
+ return 38400;
+#else /* B38400 */
+#ifdef EXTB
+ case EXTB:
+ return 38400;
+#endif /* EXTB */
+#endif /* B38400 */
+
+#ifdef B7200
+ case B7200:
+ return 7200;
+#endif /* B7200 */
+#ifdef B14400
+ case B14400:
+ return 14400;
+#endif /* B14400 */
+#ifdef B28800
+ case B28800:
+ return 28800;
+#endif /* B28800 */
+#ifdef B57600
+ case B57600:
+ return 57600;
+#endif /* B57600 */
+#ifdef B76800
+ case B76800:
+ return 76800;
+#endif /* B76800 */
+#ifdef B115200
+ case B115200:
+ return 115200;
+#endif /* B115200 */
+#ifdef B230400
+ case B230400:
+ return 230400;
+#endif /* B230400 */
+ default:
+ return 9600;
+ }
+}
+
+/* Converts a numeric baud rate to a POSIX speed_t. */
+
+static speed_t baud_to_speed(int baud)
+{
+ switch (baud)
+ {
+ case 0:
+ return B0;
+ case 50:
+ return B50;
+ case 75:
+ return B75;
+ case 110:
+ return B110;
+ case 134:
+ return B134;
+ case 150:
+ return B150;
+ case 200:
+ return B200;
+ case 300:
+ return B300;
+ case 600:
+ return B600;
+ case 1200:
+ return B1200;
+ case 1800:
+ return B1800;
+ case 2400:
+ return B2400;
+ case 4800:
+ return B4800;
+ case 9600:
+ return B9600;
+
+#ifdef B19200
+ case 19200:
+ return B19200;
+#else /* B19200 */
+#ifdef EXTA
+ case 19200:
+ return EXTA;
+#endif /* EXTA */
+#endif /* B19200 */
+
+#ifdef B38400
+ case 38400:
+ return B38400;
+#else /* B38400 */
+#ifdef EXTB
+ case 38400:
+ return EXTB;
+#endif /* EXTB */
+#endif /* B38400 */
+
+#ifdef B7200
+ case 7200:
+ return B7200;
+#endif /* B7200 */
+#ifdef B14400
+ case 14400:
+ return B14400;
+#endif /* B14400 */
+#ifdef B28800
+ case 28800:
+ return B28800;
+#endif /* B28800 */
+#ifdef B57600
+ case 57600:
+ return B57600;
+#endif /* B57600 */
+#ifdef B76800
+ case 76800:
+ return B76800;
+#endif /* B76800 */
+#ifdef B115200
+ case 115200:
+ return B115200;
+#endif /* B115200 */
+#ifdef B230400
+ case 230400:
+ return B230400;
+#endif /* B230400 */
+ default:
+ return B9600;
+ }
+}
+
+/* Encodes terminal modes for the terminal referenced by fd in a portable
+ manner, and appends the modes to a packet being constructed. */
+
+void tty_make_modes(int fd)
+{
+ struct termios tio;
+ int baud;
+
+ /* Get the modes. */
+ if (tcgetattr(fd, &tio) < 0)
+ {
+ packet_put_char(TTY_OP_END);
+ log("tcgetattr: %.100s", strerror(errno));
+ return;
+ }
+
+ /* Store input and output baud rates. */
+ baud = speed_to_baud(cfgetospeed(&tio));
+ packet_put_char(TTY_OP_OSPEED);
+ packet_put_int(baud);
+ baud = speed_to_baud(cfgetispeed(&tio));
+ packet_put_char(TTY_OP_ISPEED);
+ packet_put_int(baud);
+
+ /* Store values of mode flags. */
+#define TTYCHAR(NAME, OP) \
+ packet_put_char(OP); packet_put_char(tio.c_cc[NAME]);
+#define TTYMODE(NAME, FIELD, OP) \
+ packet_put_char(OP); packet_put_char((tio.FIELD & NAME) != 0);
+#define SGTTYCHAR(NAME, OP)
+#define SGTTYMODE(NAME, FIELD, OP)
+#define SGTTYMODEN(NAME, FIELD, OP)
+
+#include "ttymodes.h"
+
+#undef TTYCHAR
+#undef TTYMODE
+#undef SGTTYCHAR
+#undef SGTTYMODE
+#undef SGTTYMODEN
+
+ /* Mark end of mode data. */
+ packet_put_char(TTY_OP_END);
+}
+
+/* Decodes terminal modes for the terminal referenced by fd in a portable
+ manner from a packet being read. */
+
+void tty_parse_modes(int fd, int *n_bytes_ptr)
+{
+ struct termios tio;
+ int opcode, baud;
+ int n_bytes = 0;
+ int failure = 0;
+
+ /* Get old attributes for the terminal. We will modify these flags.
+ I am hoping that if there are any machine-specific modes, they will
+ initially have reasonable values. */
+ if (tcgetattr(fd, &tio) < 0)
+ failure = -1;
+
+ for (;;)
+ {
+ n_bytes += 1;
+ opcode = packet_get_char();
+ switch (opcode)
+ {
+ case TTY_OP_END:
+ goto set;
+
+ case TTY_OP_ISPEED:
+ n_bytes += 4;
+ baud = packet_get_int();
+ if (failure != -1 && cfsetispeed(&tio, baud_to_speed(baud)) < 0)
+ error("cfsetispeed failed for %d", baud);
+ break;
+
+ case TTY_OP_OSPEED:
+ n_bytes += 4;
+ baud = packet_get_int();
+ if (failure != -1 && cfsetospeed(&tio, baud_to_speed(baud)) < 0)
+ error("cfsetospeed failed for %d", baud);
+ break;
+
+#define TTYCHAR(NAME, OP) \
+ case OP: \
+ n_bytes += 1; \
+ tio.c_cc[NAME] = packet_get_char(); \
+ break;
+#define TTYMODE(NAME, FIELD, OP) \
+ case OP: \
+ n_bytes += 1; \
+ if (packet_get_char()) \
+ tio.FIELD |= NAME; \
+ else \
+ tio.FIELD &= ~NAME; \
+ break;
+#define SGTTYCHAR(NAME, OP)
+#define SGTTYMODE(NAME, FIELD, OP)
+#define SGTTYMODEN(NAME, FIELD, OP)
+
+#include "ttymodes.h"
+
+#undef TTYCHAR
+#undef TTYMODE
+#undef SGTTYCHAR
+#undef SGTTYMODE
+#undef SGTTYMODEN
+
+ default:
+ debug("Ignoring unsupported tty mode opcode %d (0x%x)",
+ opcode, opcode);
+ /* Opcodes 0 to 127 are defined to have a one-byte argument. */
+ if (opcode >= 0 && opcode < 128)
+ {
+ n_bytes += 1;
+ (void)packet_get_char();
+ break;
+ }
+ else
+ {
+ /* Opcodes 128 to 159 are defined to have an integer argument. */
+ if (opcode >= 128 && opcode < 160)
+ {
+ n_bytes += 4;
+ (void)packet_get_int();
+ break;
+ }
+ }
+ /* It is a truly undefined opcode (160 to 255). We have no idea
+ about its arguments. So we must stop parsing. Note that some
+ data may be left in the packet; hopefully there is nothing more
+ coming after the mode data. */
+ log("parse_tty_modes: unknown opcode %d", opcode);
+ packet_integrity_check(0, 1, SSH_CMSG_REQUEST_PTY);
+ goto set;
+ }
+ }
+
+ set:
+ if (*n_bytes_ptr != n_bytes)
+ {
+ *n_bytes_ptr = n_bytes;
+ return; /* Don't process bytes passed */
+ }
+
+ if (failure == -1)
+ return; /* Packet parsed ok but tty stuff failed */
+
+ /* Set the new modes for the terminal. */
+ if (tcsetattr(fd, TCSANOW, &tio) < 0)
+ log("Setting tty modes failed: %.100s", strerror(errno));
+ return;
+}