[gssapi-openssh.git] / openssh / ttymodes.c

/* $OpenBSD: ttymodes.c,v 1.28 2008/07/07 00:31:41 stevesk Exp $ */
/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 *
 * 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".
 */

/*
 * SSH2 tty modes support by Kevin Steves.
 * Copyright (c) 2001 Kevin Steves.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * 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"

#include <sys/types.h>

#include <errno.h>
#include <string.h>
#include <termios.h>
#include <stdarg.h>

#include "packet.h"
#include "log.h"
#include "ssh1.h"
#include "compat.h"
#include "buffer.h"

#define TTY_OP_END		0
/*
 * uint32 (u_int) follows speed in SSH1 and SSH2
 */
#define TTY_OP_ISPEED_PROTO1	192
#define TTY_OP_OSPEED_PROTO1	193
#define TTY_OP_ISPEED_PROTO2	128
#define TTY_OP_OSPEED_PROTO2	129

/*
 * 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;
	}
}

/*
 * Encode a special character into SSH line format.
 */
static u_int
special_char_encode(cc_t c)
{
#ifdef _POSIX_VDISABLE
	if (c == _POSIX_VDISABLE)
		return 255;
#endif /* _POSIX_VDISABLE */
	return c;
}

/*
 * Decode a special character from SSH line format.
 */
static cc_t
special_char_decode(u_int c)
{
#ifdef _POSIX_VDISABLE
	if (c == 255)
		return _POSIX_VDISABLE;
#endif /* _POSIX_VDISABLE */
	return c;
}

/*
 * Encodes terminal modes for the terminal referenced by fd
 * or tiop in a portable manner, and appends the modes to a packet
 * being constructed.
 */
void
tty_make_modes(int fd, struct termios *tiop)
{
	struct termios tio;
	int baud;
	Buffer buf;
	int tty_op_ospeed, tty_op_ispeed;
	void (*put_arg)(Buffer *, u_int);

	buffer_init(&buf);
	if (compat20) {
		tty_op_ospeed = TTY_OP_OSPEED_PROTO2;
		tty_op_ispeed = TTY_OP_ISPEED_PROTO2;
		put_arg = buffer_put_int;
	} else {
		tty_op_ospeed = TTY_OP_OSPEED_PROTO1;
		tty_op_ispeed = TTY_OP_ISPEED_PROTO1;
		put_arg = (void (*)(Buffer *, u_int)) buffer_put_char;
	}

	if (tiop == NULL) {
		if (fd == -1) {
			debug("tty_make_modes: no fd or tio");
			goto end;
		}
		if (tcgetattr(fd, &tio) == -1) {
			logit("tcgetattr: %.100s", strerror(errno));
			goto end;
		}
	} else
		tio = *tiop;

	/* Store input and output baud rates. */
	baud = speed_to_baud(cfgetospeed(&tio));
	debug3("tty_make_modes: ospeed %d", baud);
	buffer_put_char(&buf, tty_op_ospeed);
	buffer_put_int(&buf, baud);
	baud = speed_to_baud(cfgetispeed(&tio));
	debug3("tty_make_modes: ispeed %d", baud);
	buffer_put_char(&buf, tty_op_ispeed);
	buffer_put_int(&buf, baud);

	/* Store values of mode flags. */
#define TTYCHAR(NAME, OP) \
	buffer_put_char(&buf, OP); \
	put_arg(&buf, special_char_encode(tio.c_cc[NAME]));

#define TTYMODE(NAME, FIELD, OP) \
	buffer_put_char(&buf, OP); \
	put_arg(&buf, ((tio.FIELD & NAME) != 0));

#include "ttymodes.h"

#undef TTYCHAR
#undef TTYMODE

end:
	/* Mark end of mode data. */
	buffer_put_char(&buf, TTY_OP_END);
	if (compat20)
		packet_put_string(buffer_ptr(&buf), buffer_len(&buf));
	else
		packet_put_raw(buffer_ptr(&buf), buffer_len(&buf));
	buffer_free(&buf);
}

/*
 * 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;
	u_int (*get_arg)(void);
	int arg_size;

	if (compat20) {
		*n_bytes_ptr = packet_get_int();
		debug3("tty_parse_modes: SSH2 n_bytes %d", *n_bytes_ptr);
		if (*n_bytes_ptr == 0)
			return;
		get_arg = packet_get_int;
		arg_size = 4;
	} else {
		get_arg = packet_get_char;
		arg_size = 1;
	}

	/*
	 * 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) == -1) {
		logit("tcgetattr: %.100s", strerror(errno));
		failure = -1;
	}

	for (;;) {
		n_bytes += 1;
		opcode = packet_get_char();
		switch (opcode) {
		case TTY_OP_END:
			goto set;

		/* XXX: future conflict possible */
		case TTY_OP_ISPEED_PROTO1:
		case TTY_OP_ISPEED_PROTO2:
			n_bytes += 4;
			baud = packet_get_int();
			debug3("tty_parse_modes: ispeed %d", baud);
			if (failure != -1 &&
			    cfsetispeed(&tio, baud_to_speed(baud)) == -1)
				error("cfsetispeed failed for %d", baud);
			break;

		/* XXX: future conflict possible */
		case TTY_OP_OSPEED_PROTO1:
		case TTY_OP_OSPEED_PROTO2:
			n_bytes += 4;
			baud = packet_get_int();
			debug3("tty_parse_modes: ospeed %d", baud);
			if (failure != -1 &&
			    cfsetospeed(&tio, baud_to_speed(baud)) == -1)
				error("cfsetospeed failed for %d", baud);
			break;

#define TTYCHAR(NAME, OP) \
	case OP: \
	  n_bytes += arg_size; \
	  tio.c_cc[NAME] = special_char_decode(get_arg()); \
	  break;
#define TTYMODE(NAME, FIELD, OP) \
	case OP: \
	  n_bytes += arg_size; \
	  if (get_arg()) \
	    tio.FIELD |= NAME; \
	  else \
	    tio.FIELD &= ~NAME;	\
	  break;

#include "ttymodes.h"

#undef TTYCHAR
#undef TTYMODE

		default:
			debug("Ignoring unsupported tty mode opcode %d (0x%x)",
			    opcode, opcode);
			if (!compat20) {
				/*
				 * SSH1:
				 * Opcodes 1 to 127 are defined to have
				 * a one-byte argument.
				 * Opcodes 128 to 159 are defined to have
				 * an integer argument.
				 */
				if (opcode > 0 && opcode < 128) {
					n_bytes += 1;
					(void) packet_get_char();
					break;
				} else if (opcode >= 128 && opcode < 160) {
					n_bytes += 4;
					(void) packet_get_int();
					break;
				} else {
					/*
					 * 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.
					 */
					logit("parse_tty_modes: unknown opcode %d",
					    opcode);
					goto set;
				}
			} else {
				/*
				 * SSH2:
				 * Opcodes 1 to 159 are defined to have
				 * a uint32 argument.
				 * Opcodes 160 to 255 are undefined and
				 * cause parsing to stop.
				 */
				if (opcode > 0 && opcode < 160) {
					n_bytes += 4;
					(void) packet_get_int();
					break;
				} else {
					logit("parse_tty_modes: unknown opcode %d",
					    opcode);
					goto set;
				}
			}
		}
	}

set:
	if (*n_bytes_ptr != n_bytes) {
		*n_bytes_ptr = n_bytes;
		logit("parse_tty_modes: n_bytes_ptr != n_bytes: %d %d",
		    *n_bytes_ptr, n_bytes);
		return;		/* Don't process bytes passed */
	}
	if (failure == -1)
		return;		/* Packet parsed ok but tcgetattr() failed */

	/* Set the new modes for the terminal. */
	if (tcsetattr(fd, TCSANOW, &tio) == -1)
		logit("Setting tty modes failed: %.100s", strerror(errno));
}
Commit	Line	Data
22616013	1	/* $OpenBSD: ttymodes.c,v 1.28 2008/07/07 00:31:41 stevesk Exp $ */
3c0ef626	2	/*
	3	* Author: Tatu Ylonen <ylo@cs.hut.fi>
	4	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	5	* All rights reserved
	6	*
	7	* As far as I am concerned, the code I have written for this software
	8	* can be used freely for any purpose. Any derived versions of this
	9	* software must be clearly marked as such, and if the derived work is
	10	* incompatible with the protocol description in the RFC file, it must be
	11	* called by a name other than "ssh" or "Secure Shell".
	12	*/
	13
	14	/*
	15	* SSH2 tty modes support by Kevin Steves.
	16	* Copyright (c) 2001 Kevin Steves. All rights reserved.
	17	*
	18	* Redistribution and use in source and binary forms, with or without
	19	* modification, are permitted provided that the following conditions
	20	* are met:
	21	* 1. Redistributions of source code must retain the above copyright
	22	* notice, this list of conditions and the following disclaimer.
	23	* 2. Redistributions in binary form must reproduce the above copyright
	24	* notice, this list of conditions and the following disclaimer in the
	25	* documentation and/or other materials provided with the distribution.
	26	*
	27	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	28	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	29	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	30	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	31	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	32	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	33	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	34	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	35	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	36	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	37	*/
	38
	39	/*
	40	* Encoding and decoding of terminal modes in a portable way.
	41	* Much of the format is defined in ttymodes.h; it is included multiple times
	42	* into this file with the appropriate macro definitions to generate the
	43	* suitable code.
	44	*/
	45
	46	#include "includes.h"
9108f8d9	47
	48	#include <sys/types.h>
	49
	50	#include <errno.h>
	51	#include <string.h>
	52	#include <termios.h>
	53	#include <stdarg.h>
3c0ef626	54
	55	#include "packet.h"
	56	#include "log.h"
	57	#include "ssh1.h"
	58	#include "compat.h"
	59	#include "buffer.h"
3c0ef626	60
	61	#define TTY_OP_END 0
	62	/*
	63	* uint32 (u_int) follows speed in SSH1 and SSH2
	64	*/
	65	#define TTY_OP_ISPEED_PROTO1 192
	66	#define TTY_OP_OSPEED_PROTO1 193
	67	#define TTY_OP_ISPEED_PROTO2 128
	68	#define TTY_OP_OSPEED_PROTO2 129
	69
	70	/*
	71	* Converts POSIX speed_t to a baud rate. The values of the
	72	* constants for speed_t are not themselves portable.
	73	*/
	74	static int
	75	speed_to_baud(speed_t speed)
	76	{
	77	switch (speed) {
	78	case B0:
	79	return 0;
	80	case B50:
	81	return 50;
	82	case B75:
	83	return 75;
	84	case B110:
	85	return 110;
	86	case B134:
	87	return 134;
	88	case B150:
	89	return 150;
	90	case B200:
	91	return 200;
	92	case B300:
	93	return 300;
	94	case B600:
	95	return 600;
	96	case B1200:
	97	return 1200;
	98	case B1800:
	99	return 1800;
	100	case B2400:
	101	return 2400;
	102	case B4800:
	103	return 4800;
	104	case B9600:
	105	return 9600;
	106
	107	#ifdef B19200
	108	case B19200:
	109	return 19200;
	110	#else /* B19200 */
	111	#ifdef EXTA
	112	case EXTA:
	113	return 19200;
	114	#endif /* EXTA */
	115	#endif /* B19200 */
	116
	117	#ifdef B38400
	118	case B38400:
	119	return 38400;
	120	#else /* B38400 */
	121	#ifdef EXTB
	122	case EXTB:
	123	return 38400;
124	#endif /* EXTB */
125	#endif /* B38400 */
126
127	#ifdef B7200
128	case B7200:
129	return 7200;
130	#endif /* B7200 */
131	#ifdef B14400
132	case B14400:
133	return 14400;
134	#endif /* B14400 */
135	#ifdef B28800
136	case B28800:
137	return 28800;
138	#endif /* B28800 */
139	#ifdef B57600
140	case B57600:
141	return 57600;
142	#endif /* B57600 */
143	#ifdef B76800
144	case B76800:
145	return 76800;
146	#endif /* B76800 */
147	#ifdef B115200
148	case B115200:
149	return 115200;
150	#endif /* B115200 */
151	#ifdef B230400
152	case B230400:
153	return 230400;
154	#endif /* B230400 */
155	default:
156	return 9600;
157	}
158	}
159
160	/*
161	* Converts a numeric baud rate to a POSIX speed_t.
162	*/
163	static speed_t
164	baud_to_speed(int baud)
165	{
166	switch (baud) {
167	case 0:
168	return B0;
169	case 50:
170	return B50;
171	case 75:
172	return B75;
173	case 110:
174	return B110;
175	case 134:
176	return B134;
177	case 150:
178	return B150;
179	case 200:
180	return B200;
181	case 300:
182	return B300;
183	case 600:
184	return B600;
185	case 1200:
186	return B1200;
187	case 1800:
188	return B1800;
189	case 2400:
190	return B2400;
191	case 4800:
192	return B4800;
193	case 9600:
194	return B9600;
195
196	#ifdef B19200
197	case 19200:
198	return B19200;
199	#else /* B19200 */
200	#ifdef EXTA
201	case 19200:
202	return EXTA;
203	#endif /* EXTA */
204	#endif /* B19200 */
205
206	#ifdef B38400
207	case 38400:
208	return B38400;
209	#else /* B38400 */
210	#ifdef EXTB
211	case 38400:
212	return EXTB;
213	#endif /* EXTB */
214	#endif /* B38400 */
215
216	#ifdef B7200
217	case 7200:
218	return B7200;
219	#endif /* B7200 */
220	#ifdef B14400
221	case 14400:
222	return B14400;
223	#endif /* B14400 */
224	#ifdef B28800
225	case 28800:
226	return B28800;
227	#endif /* B28800 */
228	#ifdef B57600
229	case 57600:
230	return B57600;
231	#endif /* B57600 */
232	#ifdef B76800
233	case 76800:
234	return B76800;
235	#endif /* B76800 */
236	#ifdef B115200
237	case 115200:
238	return B115200;
239	#endif /* B115200 */
240	#ifdef B230400
241	case 230400:
242	return B230400;
243	#endif /* B230400 */
244	default:
245	return B9600;
246	}
247	}
248
665a873d	249	/*
	250	* Encode a special character into SSH line format.
	251	*/
	252	static u_int
	253	special_char_encode(cc_t c)
	254	{
	255	#ifdef _POSIX_VDISABLE
	256	if (c == _POSIX_VDISABLE)
	257	return 255;
	258	#endif /* _POSIX_VDISABLE */
	259	return c;
	260	}
	261
	262	/*
	263	* Decode a special character from SSH line format.
	264	*/
	265	static cc_t
	266	special_char_decode(u_int c)
	267	{
	268	#ifdef _POSIX_VDISABLE
	269	if (c == 255)
	270	return _POSIX_VDISABLE;
	271	#endif /* _POSIX_VDISABLE */
	272	return c;
	273	}
	274
3c0ef626	275	/*
	276	* Encodes terminal modes for the terminal referenced by fd
	277	* or tiop in a portable manner, and appends the modes to a packet
	278	* being constructed.
	279	*/
	280	void
	281	tty_make_modes(int fd, struct termios *tiop)
	282	{
	283	struct termios tio;
	284	int baud;
	285	Buffer buf;
	286	int tty_op_ospeed, tty_op_ispeed;
	287	void (put_arg)(Buffer , u_int);
	288
	289	buffer_init(&buf);
	290	if (compat20) {
	291	tty_op_ospeed = TTY_OP_OSPEED_PROTO2;
	292	tty_op_ispeed = TTY_OP_ISPEED_PROTO2;
	293	put_arg = buffer_put_int;
	294	} else {
	295	tty_op_ospeed = TTY_OP_OSPEED_PROTO1;
	296	tty_op_ispeed = TTY_OP_ISPEED_PROTO1;
	297	put_arg = (void ()(Buffer , u_int)) buffer_put_char;
	298	}
	299
	300	if (tiop == NULL) {
22616013	301	if (fd == -1) {
	302	debug("tty_make_modes: no fd or tio");
	303	goto end;
	304	}
3c0ef626	305	if (tcgetattr(fd, &tio) == -1) {
0fff78ff	306	logit("tcgetattr: %.100s", strerror(errno));
3c0ef626	307	goto end;
	308	}
	309	} else
	310	tio = *tiop;
	311
	312	/* Store input and output baud rates. */
	313	baud = speed_to_baud(cfgetospeed(&tio));
	314	debug3("tty_make_modes: ospeed %d", baud);
	315	buffer_put_char(&buf, tty_op_ospeed);
	316	buffer_put_int(&buf, baud);
	317	baud = speed_to_baud(cfgetispeed(&tio));
	318	debug3("tty_make_modes: ispeed %d", baud);
	319	buffer_put_char(&buf, tty_op_ispeed);
	320	buffer_put_int(&buf, baud);
	321
	322	/* Store values of mode flags. */
	323	#define TTYCHAR(NAME, OP) \
3c0ef626	324	buffer_put_char(&buf, OP); \
665a873d	325	put_arg(&buf, special_char_encode(tio.c_cc[NAME]));
3c0ef626	326
3c0ef626	327	#define TTYMODE(NAME, FIELD, OP) \
3c0ef626	328	buffer_put_char(&buf, OP); \
	329	put_arg(&buf, ((tio.FIELD & NAME) != 0));
	330
	331	#include "ttymodes.h"
	332
	333	#undef TTYCHAR
	334	#undef TTYMODE
	335
	336	end:
	337	/* Mark end of mode data. */
	338	buffer_put_char(&buf, TTY_OP_END);
	339	if (compat20)
	340	packet_put_string(buffer_ptr(&buf), buffer_len(&buf));
	341	else
	342	packet_put_raw(buffer_ptr(&buf), buffer_len(&buf));
	343	buffer_free(&buf);
3c0ef626	344	}
	345
	346	/*
	347	* Decodes terminal modes for the terminal referenced by fd in a portable
	348	* manner from a packet being read.
	349	*/
	350	void
	351	tty_parse_modes(int fd, int *n_bytes_ptr)
	352	{
	353	struct termios tio;
	354	int opcode, baud;
	355	int n_bytes = 0;
	356	int failure = 0;
	357	u_int (*get_arg)(void);
22616013	358	int arg_size;
3c0ef626	359
	360	if (compat20) {
	361	*n_bytes_ptr = packet_get_int();
	362	debug3("tty_parse_modes: SSH2 n_bytes %d", *n_bytes_ptr);
	363	if (*n_bytes_ptr == 0)
	364	return;
	365	get_arg = packet_get_int;
	366	arg_size = 4;
	367	} else {
	368	get_arg = packet_get_char;
	369	arg_size = 1;
	370	}
	371
	372	/*
	373	* Get old attributes for the terminal. We will modify these
	374	* flags. I am hoping that if there are any machine-specific
	375	* modes, they will initially have reasonable values.
	376	*/
	377	if (tcgetattr(fd, &tio) == -1) {
0fff78ff	378	logit("tcgetattr: %.100s", strerror(errno));
3c0ef626	379	failure = -1;
	380	}
	381
	382	for (;;) {
	383	n_bytes += 1;
	384	opcode = packet_get_char();
	385	switch (opcode) {
	386	case TTY_OP_END:
	387	goto set;
	388
	389	/* XXX: future conflict possible */
	390	case TTY_OP_ISPEED_PROTO1:
	391	case TTY_OP_ISPEED_PROTO2:
	392	n_bytes += 4;
	393	baud = packet_get_int();
	394	debug3("tty_parse_modes: ispeed %d", baud);
9108f8d9	395	if (failure != -1 &&
9108f8d9	396	cfsetispeed(&tio, baud_to_speed(baud)) == -1)
3c0ef626	397	error("cfsetispeed failed for %d", baud);
	398	break;
	399
	400	/* XXX: future conflict possible */
	401	case TTY_OP_OSPEED_PROTO1:
	402	case TTY_OP_OSPEED_PROTO2:
	403	n_bytes += 4;
	404	baud = packet_get_int();
	405	debug3("tty_parse_modes: ospeed %d", baud);
9108f8d9	406	if (failure != -1 &&
9108f8d9	407	cfsetospeed(&tio, baud_to_speed(baud)) == -1)
3c0ef626	408	error("cfsetospeed failed for %d", baud);
	409	break;
	410
	411	#define TTYCHAR(NAME, OP) \
	412	case OP: \
	413	n_bytes += arg_size; \
665a873d	414	tio.c_cc[NAME] = special_char_decode(get_arg()); \
3c0ef626	415	break;
	416	#define TTYMODE(NAME, FIELD, OP) \
	417	case OP: \
	418	n_bytes += arg_size; \
22616013	419	if (get_arg()) \
3c0ef626	420	tio.FIELD \|= NAME; \
	421	else \
	422	tio.FIELD &= ~NAME; \
3c0ef626	423	break;
	424
	425	#include "ttymodes.h"
	426
	427	#undef TTYCHAR
	428	#undef TTYMODE
	429
	430	default:
	431	debug("Ignoring unsupported tty mode opcode %d (0x%x)",
e9a17296	432	opcode, opcode);
3c0ef626	433	if (!compat20) {
	434	/*
	435	* SSH1:
	436	* Opcodes 1 to 127 are defined to have
	437	* a one-byte argument.
700318f3	438	* Opcodes 128 to 159 are defined to have
	439	* an integer argument.
	440	*/
3c0ef626	441	if (opcode > 0 && opcode < 128) {
	442	n_bytes += 1;
	443	(void) packet_get_char();
	444	break;
	445	} else if (opcode >= 128 && opcode < 160) {
700318f3	446	n_bytes += 4;
	447	(void) packet_get_int();
	448	break;
3c0ef626	449	} else {
	450	/*
	451	* It is a truly undefined opcode (160 to 255).
	452	* We have no idea about its arguments. So we
9108f8d9	453	* must stop parsing. Note that some data
	454	* may be left in the packet; hopefully there
	455	* is nothing more coming after the mode data.
3c0ef626	456	*/
9108f8d9	457	logit("parse_tty_modes: unknown opcode %d",
9108f8d9	458	opcode);
3c0ef626	459	goto set;
700318f3	460	}
3c0ef626	461	} else {
	462	/*
	463	* SSH2:
	464	* Opcodes 1 to 159 are defined to have
	465	* a uint32 argument.
	466	* Opcodes 160 to 255 are undefined and
	467	* cause parsing to stop.
	468	*/
	469	if (opcode > 0 && opcode < 160) {
	470	n_bytes += 4;
	471	(void) packet_get_int();
	472	break;
	473	} else {
9108f8d9	474	logit("parse_tty_modes: unknown opcode %d",
9108f8d9	475	opcode);
3c0ef626	476	goto set;
3c0ef626	477	}
700318f3	478	}
3c0ef626	479	}
	480	}
	481
	482	set:
	483	if (*n_bytes_ptr != n_bytes) {
	484	*n_bytes_ptr = n_bytes;
0fff78ff	485	logit("parse_tty_modes: n_bytes_ptr != n_bytes: %d %d",
3c0ef626	486	*n_bytes_ptr, n_bytes);
	487	return; /* Don't process bytes passed */
	488	}
	489	if (failure == -1)
	490	return; /* Packet parsed ok but tcgetattr() failed */
	491
	492	/* Set the new modes for the terminal. */
	493	if (tcsetattr(fd, TCSANOW, &tio) == -1)
0fff78ff	494	logit("Setting tty modes failed: %.100s", strerror(errno));
3c0ef626	495	}