ttymodes.c - security/openssh-library - Rivoreo Source Code Repositories

 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
  *                    All rights reserved
  * 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.
  *
  * As far as I am concerned, the code I have written for this software
  * can be used freely for any purpose.  Any derived versions of this
  * software must be clearly marked as such, and if the derived work is
  * incompatible with the protocol description in the RFC file, it must be
  * called by a name other than "ssh" or "Secure Shell".
  */

 #include "includes.h"
 RCSID("$OpenBSD: ttymodes.c,v 1.8 2000/09/07 20:27:55 deraadt 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;

 	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;
 }
	/*
	* Author: Tatu Ylonen <ylo@cs.hut.fi>
	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	* All rights reserved
	* 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.
	*
	* As far as I am concerned, the code I have written for this software
	* can be used freely for any purpose. Any derived versions of this
	* software must be clearly marked as such, and if the derived work is
	* incompatible with the protocol description in the RFC file, it must be
	* called by a name other than "ssh" or "Secure Shell".
	*/

	#include "includes.h"
	RCSID("$OpenBSD: ttymodes.c,v 1.8 2000/09/07 20:27:55 deraadt 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;

	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;
	}