+/* $OpenBSD: ttymodes.c,v 1.29 2008/11/02 00:16:16 stevesk Exp $ */
/*
* 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
* 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 1.10 2001/01/21 19:06:01 markus Exp $");
+
+#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
-#define TTY_OP_ISPEED 192 /* int follows */
-#define TTY_OP_OSPEED 193 /* int follows */
+#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
baud_to_speed(int baud)
{
switch (baud) {
- case 0:
+ case 0:
return B0;
case 50:
return B50;
}
}
+/*
+ * 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
- * in a portable manner, and appends the modes to a packet
+ * or tiop in a portable manner, and appends the modes to a packet
* being constructed.
*/
void
-tty_make_modes(int fd)
+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);
- if (tcgetattr(fd, &tio) < 0) {
- packet_put_char(TTY_OP_END);
- log("tcgetattr: %.100s", strerror(errno));
- return;
+ 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));
- packet_put_char(TTY_OP_OSPEED);
- packet_put_int(baud);
+ buffer_put_char(&buf, tty_op_ospeed);
+ buffer_put_int(&buf, baud);
baud = speed_to_baud(cfgetispeed(&tio));
- packet_put_char(TTY_OP_ISPEED);
- packet_put_int(baud);
+ buffer_put_char(&buf, tty_op_ispeed);
+ buffer_put_int(&buf, baud);
/* Store values of mode flags. */
#define TTYCHAR(NAME, OP) \
- packet_put_char(OP); packet_put_char(tio.c_cc[NAME]);
+ buffer_put_char(&buf, OP); \
+ put_arg(&buf, special_char_encode(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)
+ buffer_put_char(&buf, OP); \
+ put_arg(&buf, ((tio.FIELD & NAME) != 0));
#include "ttymodes.h"
#undef TTYCHAR
#undef TTYMODE
-#undef SGTTYCHAR
-#undef SGTTYMODE
-#undef SGTTYMODEN
+end:
/* Mark end of mode data. */
- packet_put_char(TTY_OP_END);
+ 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);
}
/*
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();
+ 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) < 0)
+ if (tcgetattr(fd, &tio) == -1) {
+ logit("tcgetattr: %.100s", strerror(errno));
failure = -1;
+ }
for (;;) {
n_bytes += 1;
case TTY_OP_END:
goto set;
- case TTY_OP_ISPEED:
+ /* XXX: future conflict possible */
+ case TTY_OP_ISPEED_PROTO1:
+ case TTY_OP_ISPEED_PROTO2:
n_bytes += 4;
baud = packet_get_int();
- if (failure != -1 && cfsetispeed(&tio, baud_to_speed(baud)) < 0)
+ if (failure != -1 &&
+ cfsetispeed(&tio, baud_to_speed(baud)) == -1)
error("cfsetispeed failed for %d", baud);
break;
- case TTY_OP_OSPEED:
+ /* XXX: future conflict possible */
+ case TTY_OP_OSPEED_PROTO1:
+ case TTY_OP_OSPEED_PROTO2:
n_bytes += 4;
baud = packet_get_int();
- if (failure != -1 && cfsetospeed(&tio, baud_to_speed(baud)) < 0)
+ 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 += 1; \
- tio.c_cc[NAME] = packet_get_char(); \
+#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 += 1; \
- if (packet_get_char()) \
- tio.FIELD |= NAME; \
- else \
- tio.FIELD &= ~NAME; \
+#define TTYMODE(NAME, FIELD, OP) \
+ case OP: \
+ n_bytes += arg_size; \
+ if (get_arg()) \
+ 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 {
+ 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 >= 128 && opcode < 160) {
+ 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;
}
}
- /*
- * 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;
+ 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 tty stuff failed */
+ return; /* Packet parsed ok but tcgetattr() failed */
/* Set the new modes for the terminal. */
- if (tcsetattr(fd, TCSANOW, &tio) < 0)
- log("Setting tty modes failed: %.100s", strerror(errno));
- return;
+ if (tcsetattr(fd, TCSANOW, &tio) == -1)
+ logit("Setting tty modes failed: %.100s", strerror(errno));
}
andersk / openssh.git / blobdiff