blob: cdd32dbbebb076cec96ce67d22ebe1de1a8d9d85 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * The main loop for the interactive session (client side).
Damien Miller4af51302000-04-16 11:18:38 +10006 *
Damien Millere4340be2000-09-16 13:29:08 +11007 * 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 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 *
36 *
Damien Miller1383bd82000-04-06 12:32:37 +100037 * SSH2 support added by Markus Friedl.
Damien Millere4340be2000-09-16 13:29:08 +110038 * Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
50 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
51 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
53 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
54 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
55 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
56 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
57 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
58 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110059 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100060
61#include "includes.h"
Ben Lindstrome9613cf2001-03-05 06:14:02 +000062RCSID("$OpenBSD: clientloop.c,v 1.52 2001/02/28 08:45:39 markus Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100063
Damien Millerd4a8b7e1999-10-27 13:42:43 +100064#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000065#include "ssh1.h"
66#include "ssh2.h"
67#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100068#include "packet.h"
69#include "buffer.h"
Damien Millerb38eff82000-04-01 11:09:21 +100070#include "compat.h"
71#include "channels.h"
72#include "dispatch.h"
Damien Millerad833b32000-08-23 10:46:23 +100073#include "buffer.h"
74#include "bufaux.h"
Damien Miller0bc1bd82000-11-13 22:57:25 +110075#include "key.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000076#include "log.h"
77#include "readconf.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000078#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000079#include "authfd.h"
80#include "atomicio.h"
Damien Miller69b69aa2000-10-28 14:19:58 +110081
82/* import options */
83extern Options options;
84
Damien Millerd4a8b7e1999-10-27 13:42:43 +100085/* Flag indicating that stdin should be redirected from /dev/null. */
86extern int stdin_null_flag;
87
Damien Miller5428f641999-11-25 11:54:57 +110088/*
89 * Name of the host we are connecting to. This is the name given on the
90 * command line, or the HostName specified for the user-supplied name in a
91 * configuration file.
92 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100093extern char *host;
94
Damien Miller5428f641999-11-25 11:54:57 +110095/*
96 * Flag to indicate that we have received a window change signal which has
97 * not yet been processed. This will cause a message indicating the new
98 * window size to be sent to the server a little later. This is volatile
99 * because this is updated in a signal handler.
100 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000101static volatile int received_window_change_signal = 0;
102
103/* Terminal modes, as saved by enter_raw_mode. */
104static struct termios saved_tio;
105
Damien Miller5428f641999-11-25 11:54:57 +1100106/*
107 * Flag indicating whether we are in raw mode. This is used by
108 * enter_raw_mode and leave_raw_mode.
109 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000110static int in_raw_mode = 0;
111
112/* Flag indicating whether the user\'s terminal is in non-blocking mode. */
113static int in_non_blocking_mode = 0;
114
115/* Common data for the client loop code. */
Damien Millerad833b32000-08-23 10:46:23 +1000116static int quit_pending; /* Set to non-zero to quit the client loop. */
117static int escape_char; /* Escape character. */
Damien Miller95def091999-11-25 00:26:21 +1100118static int escape_pending; /* Last character was the escape character */
119static int last_was_cr; /* Last character was a newline. */
120static int exit_status; /* Used to store the exit status of the command. */
121static int stdin_eof; /* EOF has been encountered on standard error. */
122static Buffer stdin_buffer; /* Buffer for stdin data. */
123static Buffer stdout_buffer; /* Buffer for stdout data. */
124static Buffer stderr_buffer; /* Buffer for stderr data. */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000125static u_long stdin_bytes, stdout_bytes, stderr_bytes;
126static u_int buffer_high;/* Soft max buffer size. */
Damien Miller95def091999-11-25 00:26:21 +1100127static int connection_in; /* Connection to server (input). */
128static int connection_out; /* Connection to server (output). */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000129
Damien Miller1383bd82000-04-06 12:32:37 +1000130void client_init_dispatch(void);
131int session_ident = -1;
132
Damien Miller5428f641999-11-25 11:54:57 +1100133/* Returns the user\'s terminal to normal mode if it had been put in raw mode. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000134
Damien Miller4af51302000-04-16 11:18:38 +1000135void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000136leave_raw_mode(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000137{
Damien Miller95def091999-11-25 00:26:21 +1100138 if (!in_raw_mode)
139 return;
140 in_raw_mode = 0;
141 if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0)
142 perror("tcsetattr");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000143
Damien Miller95def091999-11-25 00:26:21 +1100144 fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000145}
146
147/* Puts the user\'s terminal in raw mode. */
148
Damien Miller4af51302000-04-16 11:18:38 +1000149void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000150enter_raw_mode(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000151{
Damien Miller95def091999-11-25 00:26:21 +1100152 struct termios tio;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000153
Damien Miller95def091999-11-25 00:26:21 +1100154 if (tcgetattr(fileno(stdin), &tio) < 0)
155 perror("tcgetattr");
156 saved_tio = tio;
157 tio.c_iflag |= IGNPAR;
158 tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
159 tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000160#ifdef IEXTEN
Damien Miller95def091999-11-25 00:26:21 +1100161 tio.c_lflag &= ~IEXTEN;
162#endif /* IEXTEN */
163 tio.c_oflag &= ~OPOST;
164 tio.c_cc[VMIN] = 1;
165 tio.c_cc[VTIME] = 0;
166 if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0)
167 perror("tcsetattr");
168 in_raw_mode = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000169
Damien Miller95def091999-11-25 00:26:21 +1100170 fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL);
171}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000172
173/* Restores stdin to blocking mode. */
174
Damien Miller4af51302000-04-16 11:18:38 +1000175void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000176leave_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000177{
Damien Miller95def091999-11-25 00:26:21 +1100178 if (in_non_blocking_mode) {
179 (void) fcntl(fileno(stdin), F_SETFL, 0);
180 in_non_blocking_mode = 0;
181 fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL);
182 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000183}
184
Damien Miller95def091999-11-25 00:26:21 +1100185/* Puts stdin terminal in non-blocking mode. */
186
Damien Miller4af51302000-04-16 11:18:38 +1000187void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000188enter_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000189{
Damien Miller95def091999-11-25 00:26:21 +1100190 in_non_blocking_mode = 1;
191 (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
192 fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000193}
194
Damien Miller5428f641999-11-25 11:54:57 +1100195/*
196 * Signal handler for the window change signal (SIGWINCH). This just sets a
197 * flag indicating that the window has changed.
198 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000199
Damien Miller4af51302000-04-16 11:18:38 +1000200void
Damien Miller95def091999-11-25 00:26:21 +1100201window_change_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000202{
Damien Miller95def091999-11-25 00:26:21 +1100203 received_window_change_signal = 1;
204 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000205}
206
Damien Miller5428f641999-11-25 11:54:57 +1100207/*
208 * Signal handler for signals that cause the program to terminate. These
209 * signals must be trapped to restore terminal modes.
210 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000211
Damien Miller4af51302000-04-16 11:18:38 +1000212void
Damien Miller95def091999-11-25 00:26:21 +1100213signal_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000214{
Damien Miller95def091999-11-25 00:26:21 +1100215 if (in_raw_mode)
216 leave_raw_mode();
217 if (in_non_blocking_mode)
218 leave_non_blocking();
219 channel_stop_listening();
220 packet_close();
221 fatal("Killed by signal %d.", sig);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000222}
223
Damien Miller5428f641999-11-25 11:54:57 +1100224/*
225 * Returns current time in seconds from Jan 1, 1970 with the maximum
226 * available resolution.
227 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000228
Damien Miller4af51302000-04-16 11:18:38 +1000229double
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000230get_current_time(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000231{
Damien Miller95def091999-11-25 00:26:21 +1100232 struct timeval tv;
233 gettimeofday(&tv, NULL);
234 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000235}
236
Damien Miller5428f641999-11-25 11:54:57 +1100237/*
238 * This is called when the interactive is entered. This checks if there is
239 * an EOF coming on stdin. We must check this explicitly, as select() does
240 * not appear to wake up when redirecting from /dev/null.
241 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000242
Damien Miller4af51302000-04-16 11:18:38 +1000243void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000244client_check_initial_eof_on_stdin(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000245{
Damien Miller95def091999-11-25 00:26:21 +1100246 int len;
247 char buf[1];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000248
Damien Miller5428f641999-11-25 11:54:57 +1100249 /*
250 * If standard input is to be "redirected from /dev/null", we simply
251 * mark that we have seen an EOF and send an EOF message to the
252 * server. Otherwise, we try to read a single character; it appears
253 * that for some files, such /dev/null, select() never wakes up for
254 * read for this descriptor, which means that we never get EOF. This
255 * way we will get the EOF if stdin comes from /dev/null or similar.
256 */
Damien Miller95def091999-11-25 00:26:21 +1100257 if (stdin_null_flag) {
258 /* Fake EOF on stdin. */
259 debug("Sending eof.");
260 stdin_eof = 1;
261 packet_start(SSH_CMSG_EOF);
262 packet_send();
263 } else {
Damien Miller95def091999-11-25 00:26:21 +1100264 enter_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000265
Damien Miller95def091999-11-25 00:26:21 +1100266 /* Check for immediate EOF on stdin. */
267 len = read(fileno(stdin), buf, 1);
268 if (len == 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100269 /* EOF. Record that we have seen it and send EOF to server. */
Damien Miller95def091999-11-25 00:26:21 +1100270 debug("Sending eof.");
271 stdin_eof = 1;
272 packet_start(SSH_CMSG_EOF);
273 packet_send();
274 } else if (len > 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100275 /*
276 * Got data. We must store the data in the buffer,
277 * and also process it as an escape character if
278 * appropriate.
279 */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000280 if ((u_char) buf[0] == escape_char)
Damien Miller95def091999-11-25 00:26:21 +1100281 escape_pending = 1;
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000282 else
Damien Miller95def091999-11-25 00:26:21 +1100283 buffer_append(&stdin_buffer, buf, 1);
Damien Miller95def091999-11-25 00:26:21 +1100284 }
Damien Miller95def091999-11-25 00:26:21 +1100285 leave_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000286 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000287}
288
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000289
Damien Miller5428f641999-11-25 11:54:57 +1100290/*
291 * Make packets from buffered stdin data, and buffer them for sending to the
292 * connection.
293 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000294
Damien Miller4af51302000-04-16 11:18:38 +1000295void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000296client_make_packets_from_stdin_data(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000297{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000298 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000299
Damien Miller95def091999-11-25 00:26:21 +1100300 /* Send buffered stdin data to the server. */
301 while (buffer_len(&stdin_buffer) > 0 &&
302 packet_not_very_much_data_to_write()) {
303 len = buffer_len(&stdin_buffer);
304 /* Keep the packets at reasonable size. */
305 if (len > packet_get_maxsize())
306 len = packet_get_maxsize();
307 packet_start(SSH_CMSG_STDIN_DATA);
308 packet_put_string(buffer_ptr(&stdin_buffer), len);
309 packet_send();
310 buffer_consume(&stdin_buffer, len);
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000311 stdin_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100312 /* If we have a pending EOF, send it now. */
313 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
314 packet_start(SSH_CMSG_EOF);
315 packet_send();
316 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000317 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000318}
319
Damien Miller5428f641999-11-25 11:54:57 +1100320/*
321 * Checks if the client window has changed, and sends a packet about it to
322 * the server if so. The actual change is detected elsewhere (by a software
323 * interrupt on Unix); this just checks the flag and sends a message if
324 * appropriate.
325 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000326
Damien Miller4af51302000-04-16 11:18:38 +1000327void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000328client_check_window_change(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000329{
Damien Miller1383bd82000-04-06 12:32:37 +1000330 struct winsize ws;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000331
Damien Miller1383bd82000-04-06 12:32:37 +1000332 if (! received_window_change_signal)
333 return;
334 /** XXX race */
335 received_window_change_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000336
Damien Miller1383bd82000-04-06 12:32:37 +1000337 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
338 return;
339
Damien Millerd3444942000-09-30 14:20:03 +1100340 debug2("client_check_window_change: changed");
Damien Miller1383bd82000-04-06 12:32:37 +1000341
342 if (compat20) {
343 channel_request_start(session_ident, "window-change", 0);
344 packet_put_int(ws.ws_col);
345 packet_put_int(ws.ws_row);
346 packet_put_int(ws.ws_xpixel);
347 packet_put_int(ws.ws_ypixel);
348 packet_send();
349 } else {
350 packet_start(SSH_CMSG_WINDOW_SIZE);
351 packet_put_int(ws.ws_row);
352 packet_put_int(ws.ws_col);
353 packet_put_int(ws.ws_xpixel);
354 packet_put_int(ws.ws_ypixel);
355 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000356 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000357}
358
Damien Miller5428f641999-11-25 11:54:57 +1100359/*
360 * Waits until the client can do something (some data becomes available on
361 * one of the file descriptors).
362 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000363
Damien Miller4af51302000-04-16 11:18:38 +1000364void
Damien Miller5e953212001-01-30 09:14:00 +1100365client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
366 int *maxfdp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000367{
Damien Miller5e953212001-01-30 09:14:00 +1100368 /* Add any selections by the channel mechanism. */
369 channel_prepare_select(readsetp, writesetp, maxfdp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000370
Damien Miller1383bd82000-04-06 12:32:37 +1000371 if (!compat20) {
372 /* Read from the connection, unless our buffers are full. */
373 if (buffer_len(&stdout_buffer) < buffer_high &&
374 buffer_len(&stderr_buffer) < buffer_high &&
375 channel_not_very_much_buffered_data())
Damien Miller5e953212001-01-30 09:14:00 +1100376 FD_SET(connection_in, *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000377 /*
378 * Read from stdin, unless we have seen EOF or have very much
379 * buffered data to send to the server.
380 */
381 if (!stdin_eof && packet_not_very_much_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100382 FD_SET(fileno(stdin), *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000383
384 /* Select stdout/stderr if have data in buffer. */
385 if (buffer_len(&stdout_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100386 FD_SET(fileno(stdout), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000387 if (buffer_len(&stderr_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100388 FD_SET(fileno(stderr), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000389 } else {
Damien Miller5e953212001-01-30 09:14:00 +1100390 FD_SET(connection_in, *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000391 }
392
Damien Miller95def091999-11-25 00:26:21 +1100393 /* Select server connection if have data to write to the server. */
394 if (packet_have_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100395 FD_SET(connection_out, *writesetp);
Damien Miller95def091999-11-25 00:26:21 +1100396
Damien Miller5428f641999-11-25 11:54:57 +1100397 /*
398 * Wait for something to happen. This will suspend the process until
399 * some selected descriptor can be read, written, or has some other
400 * event pending. Note: if you want to implement SSH_MSG_IGNORE
401 * messages to fool traffic analysis, this might be the place to do
402 * it: just have a random timeout for the select, and send a random
403 * SSH_MSG_IGNORE packet when the timeout expires.
404 */
Damien Miller95def091999-11-25 00:26:21 +1100405
Damien Miller5e953212001-01-30 09:14:00 +1100406 if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
Damien Miller95def091999-11-25 00:26:21 +1100407 char buf[100];
Ben Lindstromf9452512001-02-15 03:12:08 +0000408
409 /*
410 * We have to clear the select masks, because we return.
411 * We have to return, because the mainloop checks for the flags
412 * set by the signal handlers.
413 */
414 memset(*readsetp, 0, *maxfdp);
415 memset(*writesetp, 0, *maxfdp);
416
Damien Miller95def091999-11-25 00:26:21 +1100417 if (errno == EINTR)
418 return;
419 /* Note: we might still have data in the buffers. */
420 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
421 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100422 quit_pending = 1;
423 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000424}
425
Damien Miller4af51302000-04-16 11:18:38 +1000426void
Damien Millerad833b32000-08-23 10:46:23 +1000427client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000428{
Damien Miller95def091999-11-25 00:26:21 +1100429 struct winsize oldws, newws;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000430
Damien Miller95def091999-11-25 00:26:21 +1100431 /* Flush stdout and stderr buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000432 if (buffer_len(bout) > 0)
433 atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
434 if (buffer_len(berr) > 0)
435 atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000436
Damien Miller95def091999-11-25 00:26:21 +1100437 leave_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000438
Damien Miller5428f641999-11-25 11:54:57 +1100439 /*
440 * Free (and clear) the buffer to reduce the amount of data that gets
441 * written to swap.
442 */
Damien Millerad833b32000-08-23 10:46:23 +1000443 buffer_free(bin);
444 buffer_free(bout);
445 buffer_free(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000446
Damien Miller95def091999-11-25 00:26:21 +1100447 /* Save old window size. */
448 ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000449
Damien Miller95def091999-11-25 00:26:21 +1100450 /* Send the suspend signal to the program itself. */
451 kill(getpid(), SIGTSTP);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000452
Damien Miller95def091999-11-25 00:26:21 +1100453 /* Check if the window size has changed. */
454 if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
455 (oldws.ws_row != newws.ws_row ||
456 oldws.ws_col != newws.ws_col ||
457 oldws.ws_xpixel != newws.ws_xpixel ||
458 oldws.ws_ypixel != newws.ws_ypixel))
459 received_window_change_signal = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000460
Damien Miller95def091999-11-25 00:26:21 +1100461 /* OK, we have been continued by the user. Reinitialize buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000462 buffer_init(bin);
463 buffer_init(bout);
464 buffer_init(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000465
Damien Miller95def091999-11-25 00:26:21 +1100466 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000467}
468
Damien Miller4af51302000-04-16 11:18:38 +1000469void
Damien Miller1383bd82000-04-06 12:32:37 +1000470client_process_net_input(fd_set * readset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000471{
Damien Miller1383bd82000-04-06 12:32:37 +1000472 int len;
473 char buf[8192];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000474
Damien Miller5428f641999-11-25 11:54:57 +1100475 /*
476 * Read input from the server, and add any such data to the buffer of
477 * the packet subsystem.
478 */
Damien Miller95def091999-11-25 00:26:21 +1100479 if (FD_ISSET(connection_in, readset)) {
480 /* Read as much as possible. */
481 len = read(connection_in, buf, sizeof(buf));
482 if (len == 0) {
483 /* Received EOF. The remote host has closed the connection. */
484 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
485 host);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000486 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000487 quit_pending = 1;
488 return;
Damien Miller95def091999-11-25 00:26:21 +1100489 }
Damien Miller5428f641999-11-25 11:54:57 +1100490 /*
491 * There is a kernel bug on Solaris that causes select to
492 * sometimes wake up even though there is no data available.
493 */
Damien Miller95def091999-11-25 00:26:21 +1100494 if (len < 0 && errno == EAGAIN)
495 len = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000496
Damien Miller95def091999-11-25 00:26:21 +1100497 if (len < 0) {
498 /* An error has encountered. Perhaps there is a network problem. */
499 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
500 host, strerror(errno));
501 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100502 quit_pending = 1;
503 return;
504 }
505 packet_process_incoming(buf, len);
506 }
Damien Miller1383bd82000-04-06 12:32:37 +1000507}
508
Damien Millerad833b32000-08-23 10:46:23 +1000509/* process the characters one by one */
510int
511process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
512{
513 char string[1024];
514 pid_t pid;
515 int bytes = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000516 u_int i;
517 u_char ch;
Damien Millerad833b32000-08-23 10:46:23 +1000518 char *s;
519
520 for (i = 0; i < len; i++) {
521 /* Get one character at a time. */
522 ch = buf[i];
523
524 if (escape_pending) {
525 /* We have previously seen an escape character. */
526 /* Clear the flag now. */
527 escape_pending = 0;
528
529 /* Process the escaped character. */
530 switch (ch) {
531 case '.':
532 /* Terminate the connection. */
533 snprintf(string, sizeof string, "%c.\r\n", escape_char);
534 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +1000535
536 quit_pending = 1;
537 return -1;
538
539 case 'Z' - 64:
540 /* Suspend the program. */
541 /* Print a message to that effect to the user. */
542 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
543 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +1000544
545 /* Restore terminal modes and suspend. */
546 client_suspend_self(bin, bout, berr);
547
548 /* We have been continued. */
549 continue;
550
551 case '&':
552 /* XXX does not work yet with proto 2 */
553 if (compat20)
554 continue;
555 /*
556 * Detach the program (continue to serve connections,
557 * but put in background and no more new connections).
558 */
559 if (!stdin_eof) {
560 /*
561 * Sending SSH_CMSG_EOF alone does not always appear
562 * to be enough. So we try to send an EOF character
563 * first.
564 */
565 packet_start(SSH_CMSG_STDIN_DATA);
566 packet_put_string("\004", 1);
567 packet_send();
568 /* Close stdin. */
569 stdin_eof = 1;
570 if (buffer_len(bin) == 0) {
571 packet_start(SSH_CMSG_EOF);
572 packet_send();
573 }
574 }
575 /* Restore tty modes. */
576 leave_raw_mode();
577
578 /* Stop listening for new connections. */
579 channel_stop_listening();
580
581 printf("%c& [backgrounded]\n", escape_char);
582
583 /* Fork into background. */
584 pid = fork();
585 if (pid < 0) {
586 error("fork: %.100s", strerror(errno));
587 continue;
588 }
589 if (pid != 0) { /* This is the parent. */
590 /* The parent just exits. */
591 exit(0);
592 }
593 /* The child continues serving connections. */
594 continue; /*XXX ? */
595
596 case '?':
597 snprintf(string, sizeof string,
598"%c?\r\n\
599Supported escape sequences:\r\n\
600~. - terminate connection\r\n\
601~^Z - suspend ssh\r\n\
602~# - list forwarded connections\r\n\
603~& - background ssh (when waiting for connections to terminate)\r\n\
604~? - this message\r\n\
605~~ - send the escape character by typing it twice\r\n\
606(Note that escapes are only recognized immediately after newline.)\r\n",
607 escape_char);
608 buffer_append(berr, string, strlen(string));
609 continue;
610
611 case '#':
612 snprintf(string, sizeof string, "%c#\r\n", escape_char);
613 buffer_append(berr, string, strlen(string));
614 s = channel_open_message();
615 buffer_append(berr, s, strlen(s));
616 xfree(s);
617 continue;
618
619 default:
620 if (ch != escape_char) {
621 buffer_put_char(bin, escape_char);
622 bytes++;
623 }
624 /* Escaped characters fall through here */
625 break;
626 }
627 } else {
628 /*
629 * The previous character was not an escape char. Check if this
630 * is an escape.
631 */
632 if (last_was_cr && ch == escape_char) {
633 /* It is. Set the flag and continue to next character. */
634 escape_pending = 1;
635 continue;
636 }
637 }
638
639 /*
640 * Normal character. Record whether it was a newline,
641 * and append it to the buffer.
642 */
643 last_was_cr = (ch == '\r' || ch == '\n');
644 buffer_put_char(bin, ch);
645 bytes++;
646 }
647 return bytes;
648}
649
Damien Miller4af51302000-04-16 11:18:38 +1000650void
Damien Miller1383bd82000-04-06 12:32:37 +1000651client_process_input(fd_set * readset)
652{
Damien Miller166fca82000-04-20 07:42:21 +1000653 int len;
Damien Millerad833b32000-08-23 10:46:23 +1000654 char buf[8192];
Damien Miller1383bd82000-04-06 12:32:37 +1000655
Damien Miller95def091999-11-25 00:26:21 +1100656 /* Read input from stdin. */
657 if (FD_ISSET(fileno(stdin), readset)) {
658 /* Read as much as possible. */
659 len = read(fileno(stdin), buf, sizeof(buf));
660 if (len <= 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100661 /*
662 * Received EOF or error. They are treated
663 * similarly, except that an error message is printed
664 * if it was an error condition.
665 */
Damien Miller95def091999-11-25 00:26:21 +1100666 if (len < 0) {
667 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
668 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100669 }
670 /* Mark that we have seen EOF. */
671 stdin_eof = 1;
Damien Miller5428f641999-11-25 11:54:57 +1100672 /*
673 * Send an EOF message to the server unless there is
674 * data in the buffer. If there is data in the
675 * buffer, no message will be sent now. Code
676 * elsewhere will send the EOF when the buffer
677 * becomes empty if stdin_eof is set.
678 */
Damien Miller95def091999-11-25 00:26:21 +1100679 if (buffer_len(&stdin_buffer) == 0) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000680 packet_start(SSH_CMSG_EOF);
681 packet_send();
Damien Miller95def091999-11-25 00:26:21 +1100682 }
683 } else if (escape_char == -1) {
Damien Miller5428f641999-11-25 11:54:57 +1100684 /*
685 * Normal successful read, and no escape character.
686 * Just append the data to buffer.
687 */
Damien Miller95def091999-11-25 00:26:21 +1100688 buffer_append(&stdin_buffer, buf, len);
Damien Miller95def091999-11-25 00:26:21 +1100689 } else {
Damien Miller5428f641999-11-25 11:54:57 +1100690 /*
691 * Normal, successful read. But we have an escape character
692 * and have to process the characters one by one.
693 */
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000694 if (process_escapes(&stdin_buffer, &stdout_buffer,
695 &stderr_buffer, buf, len) == -1)
Damien Millerad833b32000-08-23 10:46:23 +1000696 return;
Damien Miller95def091999-11-25 00:26:21 +1100697 }
698 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000699}
700
Damien Miller4af51302000-04-16 11:18:38 +1000701void
Damien Miller95def091999-11-25 00:26:21 +1100702client_process_output(fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000703{
Damien Miller95def091999-11-25 00:26:21 +1100704 int len;
705 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000706
Damien Miller95def091999-11-25 00:26:21 +1100707 /* Write buffered output to stdout. */
708 if (FD_ISSET(fileno(stdout), writeset)) {
709 /* Write as much data as possible. */
710 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +1100711 buffer_len(&stdout_buffer));
Damien Miller95def091999-11-25 00:26:21 +1100712 if (len <= 0) {
713 if (errno == EAGAIN)
714 len = 0;
715 else {
Damien Miller5428f641999-11-25 11:54:57 +1100716 /*
717 * An error or EOF was encountered. Put an
718 * error message to stderr buffer.
719 */
Damien Miller95def091999-11-25 00:26:21 +1100720 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
721 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100722 quit_pending = 1;
723 return;
724 }
725 }
726 /* Consume printed data from the buffer. */
727 buffer_consume(&stdout_buffer, len);
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000728 stdout_bytes += len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000729 }
Damien Miller95def091999-11-25 00:26:21 +1100730 /* Write buffered output to stderr. */
731 if (FD_ISSET(fileno(stderr), writeset)) {
732 /* Write as much data as possible. */
733 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +1100734 buffer_len(&stderr_buffer));
Damien Miller95def091999-11-25 00:26:21 +1100735 if (len <= 0) {
736 if (errno == EAGAIN)
737 len = 0;
738 else {
Damien Miller5428f641999-11-25 11:54:57 +1100739 /* EOF or error, but can't even print error message. */
Damien Miller95def091999-11-25 00:26:21 +1100740 quit_pending = 1;
741 return;
742 }
743 }
744 /* Consume printed characters from the buffer. */
745 buffer_consume(&stderr_buffer, len);
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000746 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100747 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000748}
749
Damien Miller5428f641999-11-25 11:54:57 +1100750/*
Damien Millerb38eff82000-04-01 11:09:21 +1000751 * Get packets from the connection input buffer, and process them as long as
752 * there are packets available.
753 *
754 * Any unknown packets received during the actual
755 * session cause the session to terminate. This is
756 * intended to make debugging easier since no
757 * confirmations are sent. Any compatible protocol
758 * extensions must be negotiated during the
759 * preparatory phase.
760 */
761
Damien Miller4af51302000-04-16 11:18:38 +1000762void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000763client_process_buffered_input_packets(void)
Damien Millerb38eff82000-04-01 11:09:21 +1000764{
Damien Miller62cee002000-09-23 17:15:56 +1100765 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000766}
767
Damien Millerad833b32000-08-23 10:46:23 +1000768/* scan buf[] for '~' before sending data to the peer */
769
770int
771simple_escape_filter(Channel *c, char *buf, int len)
772{
773 /* XXX we assume c->extended is writeable */
774 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
775}
776
Damien Millerb38eff82000-04-01 11:09:21 +1000777/*
Damien Miller5428f641999-11-25 11:54:57 +1100778 * Implements the interactive session with the server. This is called after
779 * the user has been authenticated, and a command has been started on the
780 * remote host. If escape_char != -1, it is the character used as an escape
781 * character for terminating or suspending the session.
782 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000783
Damien Miller4af51302000-04-16 11:18:38 +1000784int
Damien Millerad833b32000-08-23 10:46:23 +1000785client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000786{
Damien Miller5e953212001-01-30 09:14:00 +1100787 fd_set *readset = NULL, *writeset = NULL;
788 int max_fd = 0;
Damien Miller95def091999-11-25 00:26:21 +1100789 double start_time, total_time;
790 int len;
791 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000792
Damien Miller95def091999-11-25 00:26:21 +1100793 debug("Entering interactive session.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000794
Damien Miller95def091999-11-25 00:26:21 +1100795 start_time = get_current_time();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000796
Damien Miller95def091999-11-25 00:26:21 +1100797 /* Initialize variables. */
798 escape_pending = 0;
799 last_was_cr = 1;
800 exit_status = -1;
801 stdin_eof = 0;
802 buffer_high = 64 * 1024;
803 connection_in = packet_get_connection_in();
804 connection_out = packet_get_connection_out();
Damien Miller5e953212001-01-30 09:14:00 +1100805 max_fd = MAX(connection_in, connection_out);
806
807 if (!compat20) {
808 max_fd = MAX(max_fd, fileno(stdin));
809 max_fd = MAX(max_fd, fileno(stdout));
810 max_fd = MAX(max_fd, fileno(stderr));
811 }
Damien Miller95def091999-11-25 00:26:21 +1100812 stdin_bytes = 0;
813 stdout_bytes = 0;
814 stderr_bytes = 0;
815 quit_pending = 0;
816 escape_char = escape_char_arg;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000817
Damien Miller95def091999-11-25 00:26:21 +1100818 /* Initialize buffers. */
819 buffer_init(&stdin_buffer);
820 buffer_init(&stdout_buffer);
821 buffer_init(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000822
Damien Millerb38eff82000-04-01 11:09:21 +1000823 client_init_dispatch();
824
Damien Miller95def091999-11-25 00:26:21 +1100825 /* Set signal handlers to restore non-blocking mode. */
826 signal(SIGINT, signal_handler);
827 signal(SIGQUIT, signal_handler);
828 signal(SIGTERM, signal_handler);
829 signal(SIGPIPE, SIG_IGN);
830 if (have_pty)
831 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000832
Damien Miller95def091999-11-25 00:26:21 +1100833 if (have_pty)
834 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000835
Ben Lindstrom5b828322001-02-09 01:34:36 +0000836 if (compat20) {
837 session_ident = ssh2_chan_id;
838 if (escape_char != -1)
839 channel_register_filter(session_ident,
840 simple_escape_filter);
841 } else {
842 /* Check if we should immediately send eof on stdin. */
Damien Miller1383bd82000-04-06 12:32:37 +1000843 client_check_initial_eof_on_stdin();
Ben Lindstrom5b828322001-02-09 01:34:36 +0000844 }
Damien Millerad833b32000-08-23 10:46:23 +1000845
Damien Miller95def091999-11-25 00:26:21 +1100846 /* Main loop of the client for the interactive session mode. */
847 while (!quit_pending) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000848
Damien Miller5428f641999-11-25 11:54:57 +1100849 /* Process buffered packets sent by the server. */
Damien Miller95def091999-11-25 00:26:21 +1100850 client_process_buffered_input_packets();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000851
Damien Miller1383bd82000-04-06 12:32:37 +1000852 if (compat20 && !channel_still_open()) {
Damien Millerd3444942000-09-30 14:20:03 +1100853 debug2("!channel_still_open.");
Damien Miller1383bd82000-04-06 12:32:37 +1000854 break;
855 }
856
Damien Miller5428f641999-11-25 11:54:57 +1100857 /*
858 * Make packets of buffered stdin data, and buffer them for
859 * sending to the server.
860 */
Damien Miller1383bd82000-04-06 12:32:37 +1000861 if (!compat20)
862 client_make_packets_from_stdin_data();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000863
Damien Miller5428f641999-11-25 11:54:57 +1100864 /*
Damien Miller5e953212001-01-30 09:14:00 +1100865 * Make packets from buffered channel data, and enqueue them
Damien Miller5428f641999-11-25 11:54:57 +1100866 * for sending to the server.
867 */
Damien Miller95def091999-11-25 00:26:21 +1100868 if (packet_not_very_much_data_to_write())
869 channel_output_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000870
Damien Miller5428f641999-11-25 11:54:57 +1100871 /*
872 * Check if the window size has changed, and buffer a message
873 * about it to the server if so.
874 */
Damien Miller95def091999-11-25 00:26:21 +1100875 client_check_window_change();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000876
Damien Miller95def091999-11-25 00:26:21 +1100877 if (quit_pending)
878 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000879
Damien Miller5428f641999-11-25 11:54:57 +1100880 /*
881 * Wait until we have something to do (something becomes
882 * available on one of the descriptors).
883 */
Damien Miller5e953212001-01-30 09:14:00 +1100884 client_wait_until_can_do_something(&readset, &writeset, &max_fd);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000885
Damien Miller95def091999-11-25 00:26:21 +1100886 if (quit_pending)
887 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000888
Damien Miller95def091999-11-25 00:26:21 +1100889 /* Do channel operations. */
Damien Miller5e953212001-01-30 09:14:00 +1100890 channel_after_select(readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000891
Damien Miller1383bd82000-04-06 12:32:37 +1000892 /* Buffer input from the connection. */
Damien Miller5e953212001-01-30 09:14:00 +1100893 client_process_net_input(readset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000894
Damien Miller1383bd82000-04-06 12:32:37 +1000895 if (quit_pending)
896 break;
897
898 if (!compat20) {
899 /* Buffer data from stdin */
Damien Miller5e953212001-01-30 09:14:00 +1100900 client_process_input(readset);
Damien Miller1383bd82000-04-06 12:32:37 +1000901 /*
902 * Process output to stdout and stderr. Output to
903 * the connection is processed elsewhere (above).
904 */
Damien Miller5e953212001-01-30 09:14:00 +1100905 client_process_output(writeset);
Damien Miller1383bd82000-04-06 12:32:37 +1000906 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000907
Damien Miller5428f641999-11-25 11:54:57 +1100908 /* Send as much buffered packet data as possible to the sender. */
Damien Miller5e953212001-01-30 09:14:00 +1100909 if (FD_ISSET(connection_out, writeset))
Damien Miller95def091999-11-25 00:26:21 +1100910 packet_write_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000911 }
Damien Miller5e953212001-01-30 09:14:00 +1100912 if (readset)
913 xfree(readset);
914 if (writeset)
915 xfree(writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000916
Damien Miller95def091999-11-25 00:26:21 +1100917 /* Terminate the session. */
918
919 /* Stop watching for window change. */
920 if (have_pty)
921 signal(SIGWINCH, SIG_DFL);
922
923 /* Stop listening for connections. */
924 channel_stop_listening();
925
Damien Miller5428f641999-11-25 11:54:57 +1100926 /*
927 * In interactive mode (with pseudo tty) display a message indicating
928 * that the connection has been closed.
929 */
Damien Miller95def091999-11-25 00:26:21 +1100930 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
931 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
932 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000933 }
Damien Miller95def091999-11-25 00:26:21 +1100934 /* Output any buffered data for stdout. */
935 while (buffer_len(&stdout_buffer) > 0) {
936 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +1100937 buffer_len(&stdout_buffer));
Damien Miller95def091999-11-25 00:26:21 +1100938 if (len <= 0) {
939 error("Write failed flushing stdout buffer.");
940 break;
941 }
942 buffer_consume(&stdout_buffer, len);
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000943 stdout_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100944 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000945
Damien Miller95def091999-11-25 00:26:21 +1100946 /* Output any buffered data for stderr. */
947 while (buffer_len(&stderr_buffer) > 0) {
948 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +1100949 buffer_len(&stderr_buffer));
Damien Miller95def091999-11-25 00:26:21 +1100950 if (len <= 0) {
951 error("Write failed flushing stderr buffer.");
952 break;
953 }
954 buffer_consume(&stderr_buffer, len);
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000955 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100956 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000957
Damien Miller95def091999-11-25 00:26:21 +1100958 if (have_pty)
959 leave_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000960
Damien Miller95def091999-11-25 00:26:21 +1100961 /* Clear and free any buffers. */
962 memset(buf, 0, sizeof(buf));
963 buffer_free(&stdin_buffer);
964 buffer_free(&stdout_buffer);
965 buffer_free(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000966
Damien Miller95def091999-11-25 00:26:21 +1100967 /* Report bytes transferred, and transfer rates. */
968 total_time = get_current_time() - start_time;
969 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
970 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
971 if (total_time > 0)
972 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
973 stdin_bytes / total_time, stdout_bytes / total_time,
974 stderr_bytes / total_time);
975
976 /* Return the exit status of the program. */
977 debug("Exit status %d", exit_status);
978 return exit_status;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000979}
Damien Millerb38eff82000-04-01 11:09:21 +1000980
981/*********/
982
983void
Damien Miller62cee002000-09-23 17:15:56 +1100984client_input_stdout_data(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000985{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000986 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000987 char *data = packet_get_string(&data_len);
988 packet_integrity_check(plen, 4 + data_len, type);
989 buffer_append(&stdout_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +1000990 memset(data, 0, data_len);
991 xfree(data);
992}
993void
Damien Miller62cee002000-09-23 17:15:56 +1100994client_input_stderr_data(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000995{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000996 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000997 char *data = packet_get_string(&data_len);
998 packet_integrity_check(plen, 4 + data_len, type);
999 buffer_append(&stderr_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001000 memset(data, 0, data_len);
1001 xfree(data);
1002}
1003void
Damien Miller62cee002000-09-23 17:15:56 +11001004client_input_exit_status(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001005{
1006 packet_integrity_check(plen, 4, type);
1007 exit_status = packet_get_int();
1008 /* Acknowledge the exit. */
1009 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1010 packet_send();
1011 /*
1012 * Must wait for packet to be sent since we are
1013 * exiting the loop.
1014 */
1015 packet_write_wait();
1016 /* Flag that we want to exit. */
1017 quit_pending = 1;
1018}
1019
Damien Miller0bc1bd82000-11-13 22:57:25 +11001020Channel *
1021client_request_forwarded_tcpip(const char *request_type, int rchan)
1022{
1023 Channel* c = NULL;
1024 char *listen_address, *originator_address;
1025 int listen_port, originator_port;
1026 int sock, newch;
1027
1028 /* Get rest of the packet */
1029 listen_address = packet_get_string(NULL);
1030 listen_port = packet_get_int();
1031 originator_address = packet_get_string(NULL);
1032 originator_port = packet_get_int();
1033 packet_done();
1034
1035 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1036 listen_address, listen_port, originator_address, originator_port);
1037
1038 sock = channel_connect_by_listen_adress(listen_port);
1039 if (sock >= 0) {
1040 newch = channel_new("forwarded-tcpip",
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001041 SSH_CHANNEL_CONNECTING, sock, sock, -1,
Damien Miller0bc1bd82000-11-13 22:57:25 +11001042 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1043 xstrdup(originator_address), 1);
1044 c = channel_lookup(newch);
1045 }
1046 xfree(originator_address);
1047 xfree(listen_address);
1048 return c;
1049}
1050
1051Channel*
1052client_request_x11(const char *request_type, int rchan)
1053{
1054 Channel *c = NULL;
1055 char *originator;
1056 int originator_port;
1057 int sock, newch;
1058
1059 if (!options.forward_x11) {
1060 error("Warning: ssh server tried X11 forwarding.");
1061 error("Warning: this is probably a break in attempt by a malicious server.");
1062 return NULL;
1063 }
1064 originator = packet_get_string(NULL);
1065 if (datafellows & SSH_BUG_X11FWD) {
1066 debug2("buggy server: x11 request w/o originator_port");
1067 originator_port = 0;
1068 } else {
1069 originator_port = packet_get_int();
1070 }
1071 packet_done();
1072 /* XXX check permission */
Damien Millerd83ff352001-01-30 09:19:34 +11001073 debug("client_request_x11: request from %s %d", originator,
1074 originator_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001075 sock = x11_connect_display();
1076 if (sock >= 0) {
1077 newch = channel_new("x11",
1078 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1079 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
1080 xstrdup("x11"), 1);
1081 c = channel_lookup(newch);
1082 }
1083 xfree(originator);
1084 return c;
1085}
1086
1087Channel*
1088client_request_agent(const char *request_type, int rchan)
1089{
1090 Channel *c = NULL;
1091 int sock, newch;
1092
1093 if (!options.forward_agent) {
1094 error("Warning: ssh server tried agent forwarding.");
1095 error("Warning: this is probably a break in attempt by a malicious server.");
1096 return NULL;
1097 }
1098 sock = ssh_get_authentication_socket();
1099 if (sock >= 0) {
1100 newch = channel_new("authentication agent connection",
1101 SSH_CHANNEL_OPEN, sock, sock, -1,
1102 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1103 xstrdup("authentication agent connection"), 1);
1104 c = channel_lookup(newch);
1105 }
1106 return c;
1107}
1108
Damien Millerbd483e72000-04-30 10:00:53 +10001109/* XXXX move to generic input handler */
1110void
Damien Miller62cee002000-09-23 17:15:56 +11001111client_input_channel_open(int type, int plen, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10001112{
1113 Channel *c = NULL;
1114 char *ctype;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001115 u_int len;
Damien Millerbd483e72000-04-30 10:00:53 +10001116 int rchan;
1117 int rmaxpack;
1118 int rwindow;
1119
1120 ctype = packet_get_string(&len);
1121 rchan = packet_get_int();
1122 rwindow = packet_get_int();
1123 rmaxpack = packet_get_int();
1124
Damien Millere247cc42000-05-07 12:03:14 +10001125 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
Damien Millerbd483e72000-04-30 10:00:53 +10001126 ctype, rchan, rwindow, rmaxpack);
1127
Damien Miller0bc1bd82000-11-13 22:57:25 +11001128 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1129 c = client_request_forwarded_tcpip(ctype, rchan);
1130 } else if (strcmp(ctype, "x11") == 0) {
1131 c = client_request_x11(ctype, rchan);
1132 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1133 c = client_request_agent(ctype, rchan);
Damien Millerbd483e72000-04-30 10:00:53 +10001134 }
1135/* XXX duplicate : */
1136 if (c != NULL) {
1137 debug("confirm %s", ctype);
1138 c->remote_id = rchan;
1139 c->remote_window = rwindow;
1140 c->remote_maxpacket = rmaxpack;
1141
1142 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1143 packet_put_int(c->remote_id);
1144 packet_put_int(c->self);
1145 packet_put_int(c->local_window);
1146 packet_put_int(c->local_maxpacket);
1147 packet_send();
1148 } else {
1149 debug("failure %s", ctype);
1150 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1151 packet_put_int(rchan);
1152 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1153 packet_put_cstring("bla bla");
1154 packet_put_cstring("");
1155 packet_send();
1156 }
1157 xfree(ctype);
1158}
Ben Lindstrom5b828322001-02-09 01:34:36 +00001159void
1160client_input_channel_req(int type, int plen, void *ctxt)
1161{
1162 Channel *c = NULL;
1163 int id, reply, success = 0;
1164 char *rtype;
1165
1166 id = packet_get_int();
1167 rtype = packet_get_string(NULL);
1168 reply = packet_get_char();
1169
1170 debug("client_input_channel_req: channel %d rtype %s reply %d",
1171 id, rtype, reply);
1172
1173 if (session_ident == -1) {
1174 error("client_input_channel_req: no channel %d", session_ident);
1175 } else if (id != session_ident) {
1176 error("client_input_channel_req: channel %d: wrong channel: %d",
1177 session_ident, id);
1178 }
1179 c = channel_lookup(id);
1180 if (c == NULL) {
1181 error("client_input_channel_req: channel %d: unknown channel", id);
1182 } else if (strcmp(rtype, "exit-status") == 0) {
1183 success = 1;
1184 exit_status = packet_get_int();
1185 packet_done();
1186 }
1187 if (reply) {
1188 packet_start(success ?
1189 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1190 packet_put_int(c->remote_id);
1191 packet_send();
1192 }
1193 xfree(rtype);
1194}
Damien Millerbd483e72000-04-30 10:00:53 +10001195
Damien Miller4af51302000-04-16 11:18:38 +10001196void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001197client_init_dispatch_20(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001198{
1199 dispatch_init(&dispatch_protocol_error);
1200 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1201 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1202 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1203 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
Damien Millerbd483e72000-04-30 10:00:53 +10001204 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
Damien Miller1383bd82000-04-06 12:32:37 +10001205 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1206 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001207 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
Damien Miller1383bd82000-04-06 12:32:37 +10001208 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1209}
Damien Miller4af51302000-04-16 11:18:38 +10001210void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001211client_init_dispatch_13(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001212{
1213 dispatch_init(NULL);
1214 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1215 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1216 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
Damien Millerb38eff82000-04-01 11:09:21 +10001217 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1218 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1219 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001220 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1221 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1222 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
Damien Miller69b69aa2000-10-28 14:19:58 +11001223
1224 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1225 &auth_input_open_request : &deny_input_open);
1226 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1227 &x11_input_open : &deny_input_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001228}
Damien Miller4af51302000-04-16 11:18:38 +10001229void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001230client_init_dispatch_15(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001231{
1232 client_init_dispatch_13();
1233 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1234 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1235}
Damien Miller4af51302000-04-16 11:18:38 +10001236void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001237client_init_dispatch(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001238{
Damien Miller1383bd82000-04-06 12:32:37 +10001239 if (compat20)
1240 client_init_dispatch_20();
1241 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001242 client_init_dispatch_13();
1243 else
1244 client_init_dispatch_15();
1245}