Put ssh back into the repository
Change-Id: I23324372188fa6ed3f93a32b84365f5df6367590
diff --git a/ttymodes.c b/ttymodes.c
new file mode 100644
index 0000000..6f51b8a
--- /dev/null
+++ b/ttymodes.c
@@ -0,0 +1,490 @@
+/* $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
+ *
+ * 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));
+ buffer_put_char(&buf, tty_op_ospeed);
+ buffer_put_int(&buf, baud);
+ baud = speed_to_baud(cfgetispeed(&tio));
+ 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();
+ 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();
+ 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();
+ 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));
+}