зеркало из https://github.com/Azure/sonic-openssh.git
463 строки
10 KiB
C
463 строки
10 KiB
C
/*
|
|
* 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"
|
|
RCSID("$OpenBSD: ttymodes.c,v 1.14 2001/06/24 17:18:31 markus Exp $");
|
|
|
|
#include "packet.h"
|
|
#include "log.h"
|
|
#include "ssh1.h"
|
|
#include "compat.h"
|
|
#include "buffer.h"
|
|
#include "bufaux.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;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 (tcgetattr(fd, &tio) == -1) {
|
|
log("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) \
|
|
debug3("tty_make_modes: %d %d", OP, tio.c_cc[NAME]); \
|
|
buffer_put_char(&buf, OP); \
|
|
put_arg(&buf, tio.c_cc[NAME]);
|
|
|
|
#define TTYMODE(NAME, FIELD, OP) \
|
|
debug3("tty_make_modes: %d %d", OP, ((tio.FIELD & NAME) != 0)); \
|
|
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);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* 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, 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) {
|
|
log("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] = get_arg(); \
|
|
debug3("tty_parse_modes: %d %d", OP, tio.c_cc[NAME]); \
|
|
break;
|
|
#define TTYMODE(NAME, FIELD, OP) \
|
|
case OP: \
|
|
n_bytes += arg_size; \
|
|
if ((arg = get_arg())) \
|
|
tio.FIELD |= NAME; \
|
|
else \
|
|
tio.FIELD &= ~NAME; \
|
|
debug3("tty_parse_modes: %d %d", OP, arg); \
|
|
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.
|
|
*/
|
|
log("parse_tty_modes: unknown opcode %d", opcode);
|
|
packet_integrity_check(0, 1, SSH_CMSG_REQUEST_PTY);
|
|
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 {
|
|
log("parse_tty_modes: unknown opcode %d", opcode);
|
|
goto set;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
set:
|
|
if (*n_bytes_ptr != n_bytes) {
|
|
*n_bytes_ptr = n_bytes;
|
|
log("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)
|
|
log("Setting tty modes failed: %.100s", strerror(errno));
|
|
return;
|
|
}
|