X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/8efc0c151a0f57612e1aa0abb5b7d536db4cf76a..01dafcb504c448f0d4d5834c21b99e025f492550:/ttymodes.c

diff --git a/ttymodes.c b/ttymodes.c
index 6124620f..8afdff1a 100644
--- a/ttymodes.c
+++ b/ttymodes.c
@@ -1,359 +1,461 @@
 /*
+ * 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".
+ */
 
-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.
+/*
+ * 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("$Id$");
+RCSID("$OpenBSD: ttymodes.c,v 1.17 2002/03/19 10:49:35 markus 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 */
+#include "log.h"
+#include "ssh1.h"
+#include "compat.h"
+#include "buffer.h"
+#include "bufaux.h"
 
-/* Converts POSIX speed_t to a baud rate.  The values of the constants
-   for speed_t are not themselves portable. */
+#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
 
-static int speed_to_baud(speed_t speed)
+/*
+ * 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;
+	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;
+	case B19200:
+		return 19200;
 #else /* B19200 */
 #ifdef EXTA
-    case EXTA:
-      return 19200;
+	case EXTA:
+		return 19200;
 #endif /* EXTA */
 #endif /* B19200 */
 
 #ifdef B38400
-    case B38400:
-      return 38400;
+	case B38400:
+		return 38400;
 #else /* B38400 */
 #ifdef EXTB
-    case EXTB:
-      return 38400;
+	case EXTB:
+		return 38400;
 #endif /* EXTB */
 #endif /* B38400 */
 
 #ifdef B7200
-    case B7200:
-      return 7200;
+	case B7200:
+		return 7200;
 #endif /* B7200 */
 #ifdef B14400
-    case B14400:
-      return 14400;
+	case B14400:
+		return 14400;
 #endif /* B14400 */
 #ifdef B28800
-    case B28800:
-      return 28800;
+	case B28800:
+		return 28800;
 #endif /* B28800 */
 #ifdef B57600
-    case B57600:
-      return 57600;
+	case B57600:
+		return 57600;
 #endif /* B57600 */
 #ifdef B76800
-    case B76800:
-      return 76800;
+	case B76800:
+		return 76800;
 #endif /* B76800 */
 #ifdef B115200
-    case B115200:
-      return 115200;
+	case B115200:
+		return 115200;
 #endif /* B115200 */
 #ifdef B230400
-    case B230400:
-      return 230400;
+	case B230400:
+		return 230400;
 #endif /* B230400 */
-    default:
-      return 9600;
-    }
+	default:
+		return 9600;
+	}
 }
 
-/* Converts a numeric baud rate to a POSIX speed_t. */
-
-static speed_t baud_to_speed(int baud)
+/*
+ * 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;
+	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;
+	case 19200:
+		return B19200;
 #else /* B19200 */
 #ifdef EXTA
-    case 19200:
-      return EXTA;
+	case 19200:
+		return EXTA;
 #endif /* EXTA */
 #endif /* B19200 */
 
 #ifdef B38400
-    case 38400:
-      return B38400;
+	case 38400:
+		return B38400;
 #else /* B38400 */
 #ifdef EXTB
-    case 38400:
-      return EXTB;
+	case 38400:
+		return EXTB;
 #endif /* EXTB */
 #endif /* B38400 */
 
 #ifdef B7200
-    case 7200:
-      return B7200;
+	case 7200:
+		return B7200;
 #endif /* B7200 */
 #ifdef B14400
-    case 14400:
-      return B14400;
+	case 14400:
+		return B14400;
 #endif /* B14400 */
 #ifdef B28800
-    case 28800:
-      return B28800;
+	case 28800:
+		return B28800;
 #endif /* B28800 */
 #ifdef B57600
-    case 57600:
-      return B57600;
+	case 57600:
+		return B57600;
 #endif /* B57600 */
 #ifdef B76800
-    case 76800:
-      return B76800;
+	case 76800:
+		return B76800;
 #endif /* B76800 */
 #ifdef B115200
-    case 115200:
-      return B115200;
+	case 115200:
+		return B115200;
 #endif /* B115200 */
 #ifdef B230400
-    case 230400:
-      return B230400;
+	case 230400:
+		return B230400;
 #endif /* B230400 */
-    default:
-      return B9600;
-    }
+	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)
+/*
+ * 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;
-
-  /* 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. */
+	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) \
-  packet_put_char(OP); packet_put_char(tio.c_cc[NAME]);
+	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) \
-  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)
+	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
-#undef SGTTYCHAR
-#undef SGTTYMODE
-#undef SGTTYMODEN
 
-  /* Mark end of mode data. */
-  packet_put_char(TTY_OP_END);
+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)
+/*
+ * 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;
+	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;
+	}
 
-	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;
+	/*
+	 * 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 += 1;					\
-	  tio.c_cc[NAME] = packet_get_char();		\
+#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 += 1;					\
-	  if (packet_get_char())			\
-	    tio.FIELD |= NAME;				\
-	  else						\
-	    tio.FIELD &= ~NAME;				\
+#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;
-#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;
+		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);
+					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;
+				}
+			}
 		}
-	    }
-	  /* 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;
+
+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;
 }