blob: 94d2ec60bb0ec09b795153f92ba8840f2ed01cc7 [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 Lindstromd3447632001-04-08 18:07:22 +000062RCSID("$OpenBSD: clientloop.c,v 1.61 2001/04/08 11:27:33 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 Lindstromf28f6342001-04-04 02:03:04 +000076#include "kex.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000077#include "log.h"
78#include "readconf.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000079#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000080#include "authfd.h"
81#include "atomicio.h"
Damien Miller69b69aa2000-10-28 14:19:58 +110082
83/* import options */
84extern Options options;
85
Damien Millerd4a8b7e1999-10-27 13:42:43 +100086/* Flag indicating that stdin should be redirected from /dev/null. */
87extern int stdin_null_flag;
88
Damien Miller5428f641999-11-25 11:54:57 +110089/*
90 * Name of the host we are connecting to. This is the name given on the
91 * command line, or the HostName specified for the user-supplied name in a
92 * configuration file.
93 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100094extern char *host;
95
Damien Miller5428f641999-11-25 11:54:57 +110096/*
97 * Flag to indicate that we have received a window change signal which has
98 * not yet been processed. This will cause a message indicating the new
99 * window size to be sent to the server a little later. This is volatile
100 * because this is updated in a signal handler.
101 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000102static volatile int received_window_change_signal = 0;
103
104/* Terminal modes, as saved by enter_raw_mode. */
105static struct termios saved_tio;
106
Damien Miller5428f641999-11-25 11:54:57 +1100107/*
108 * Flag indicating whether we are in raw mode. This is used by
109 * enter_raw_mode and leave_raw_mode.
110 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000111static int in_raw_mode = 0;
112
113/* Flag indicating whether the user\'s terminal is in non-blocking mode. */
114static int in_non_blocking_mode = 0;
115
116/* Common data for the client loop code. */
Damien Millerad833b32000-08-23 10:46:23 +1000117static int quit_pending; /* Set to non-zero to quit the client loop. */
118static int escape_char; /* Escape character. */
Damien Miller95def091999-11-25 00:26:21 +1100119static int escape_pending; /* Last character was the escape character */
120static int last_was_cr; /* Last character was a newline. */
121static int exit_status; /* Used to store the exit status of the command. */
122static int stdin_eof; /* EOF has been encountered on standard error. */
123static Buffer stdin_buffer; /* Buffer for stdin data. */
124static Buffer stdout_buffer; /* Buffer for stdout data. */
125static Buffer stderr_buffer; /* Buffer for stderr data. */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000126static u_long stdin_bytes, stdout_bytes, stderr_bytes;
127static u_int buffer_high;/* Soft max buffer size. */
Damien Miller95def091999-11-25 00:26:21 +1100128static int connection_in; /* Connection to server (input). */
129static int connection_out; /* Connection to server (output). */
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000130static int need_rekeying; /* Set to non-zero if rekeying is requested. */
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +0000131static int session_closed = 0; /* In SSH2: login session closed. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000132
Damien Miller1383bd82000-04-06 12:32:37 +1000133void client_init_dispatch(void);
134int session_ident = -1;
135
Ben Lindstromf28f6342001-04-04 02:03:04 +0000136/*XXX*/
137extern Kex *xxx_kex;
138
Damien Miller5428f641999-11-25 11:54:57 +1100139/* Returns the user\'s terminal to normal mode if it had been put in raw mode. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000140
Damien Miller4af51302000-04-16 11:18:38 +1000141void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000142leave_raw_mode(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000143{
Damien Miller95def091999-11-25 00:26:21 +1100144 if (!in_raw_mode)
145 return;
146 in_raw_mode = 0;
147 if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0)
148 perror("tcsetattr");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000149
Damien Miller95def091999-11-25 00:26:21 +1100150 fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000151}
152
153/* Puts the user\'s terminal in raw mode. */
154
Damien Miller4af51302000-04-16 11:18:38 +1000155void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000156enter_raw_mode(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000157{
Damien Miller95def091999-11-25 00:26:21 +1100158 struct termios tio;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000159
Damien Miller95def091999-11-25 00:26:21 +1100160 if (tcgetattr(fileno(stdin), &tio) < 0)
161 perror("tcgetattr");
162 saved_tio = tio;
163 tio.c_iflag |= IGNPAR;
164 tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
165 tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000166#ifdef IEXTEN
Damien Miller95def091999-11-25 00:26:21 +1100167 tio.c_lflag &= ~IEXTEN;
168#endif /* IEXTEN */
169 tio.c_oflag &= ~OPOST;
170 tio.c_cc[VMIN] = 1;
171 tio.c_cc[VTIME] = 0;
172 if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0)
173 perror("tcsetattr");
174 in_raw_mode = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000175
Damien Miller95def091999-11-25 00:26:21 +1100176 fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL);
177}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000178
179/* Restores stdin to blocking mode. */
180
Damien Miller4af51302000-04-16 11:18:38 +1000181void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000182leave_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000183{
Damien Miller95def091999-11-25 00:26:21 +1100184 if (in_non_blocking_mode) {
185 (void) fcntl(fileno(stdin), F_SETFL, 0);
186 in_non_blocking_mode = 0;
187 fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL);
188 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000189}
190
Damien Miller95def091999-11-25 00:26:21 +1100191/* Puts stdin terminal in non-blocking mode. */
192
Damien Miller4af51302000-04-16 11:18:38 +1000193void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000194enter_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000195{
Damien Miller95def091999-11-25 00:26:21 +1100196 in_non_blocking_mode = 1;
197 (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
198 fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000199}
200
Damien Miller5428f641999-11-25 11:54:57 +1100201/*
202 * Signal handler for the window change signal (SIGWINCH). This just sets a
203 * flag indicating that the window has changed.
204 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000205
Damien Miller4af51302000-04-16 11:18:38 +1000206void
Damien Miller95def091999-11-25 00:26:21 +1100207window_change_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000208{
Damien Miller95def091999-11-25 00:26:21 +1100209 received_window_change_signal = 1;
210 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000211}
212
Damien Miller5428f641999-11-25 11:54:57 +1100213/*
214 * Signal handler for signals that cause the program to terminate. These
215 * signals must be trapped to restore terminal modes.
216 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000217
Damien Miller4af51302000-04-16 11:18:38 +1000218void
Damien Miller95def091999-11-25 00:26:21 +1100219signal_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000220{
Damien Miller95def091999-11-25 00:26:21 +1100221 if (in_raw_mode)
222 leave_raw_mode();
223 if (in_non_blocking_mode)
224 leave_non_blocking();
225 channel_stop_listening();
226 packet_close();
227 fatal("Killed by signal %d.", sig);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000228}
229
Damien Miller5428f641999-11-25 11:54:57 +1100230/*
231 * Returns current time in seconds from Jan 1, 1970 with the maximum
232 * available resolution.
233 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000234
Damien Miller4af51302000-04-16 11:18:38 +1000235double
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000236get_current_time(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000237{
Damien Miller95def091999-11-25 00:26:21 +1100238 struct timeval tv;
239 gettimeofday(&tv, NULL);
240 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000241}
242
Damien Miller5428f641999-11-25 11:54:57 +1100243/*
244 * This is called when the interactive is entered. This checks if there is
245 * an EOF coming on stdin. We must check this explicitly, as select() does
246 * not appear to wake up when redirecting from /dev/null.
247 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000248
Damien Miller4af51302000-04-16 11:18:38 +1000249void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000250client_check_initial_eof_on_stdin(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000251{
Damien Miller95def091999-11-25 00:26:21 +1100252 int len;
253 char buf[1];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000254
Damien Miller5428f641999-11-25 11:54:57 +1100255 /*
256 * If standard input is to be "redirected from /dev/null", we simply
257 * mark that we have seen an EOF and send an EOF message to the
258 * server. Otherwise, we try to read a single character; it appears
259 * that for some files, such /dev/null, select() never wakes up for
260 * read for this descriptor, which means that we never get EOF. This
261 * way we will get the EOF if stdin comes from /dev/null or similar.
262 */
Damien Miller95def091999-11-25 00:26:21 +1100263 if (stdin_null_flag) {
264 /* Fake EOF on stdin. */
265 debug("Sending eof.");
266 stdin_eof = 1;
267 packet_start(SSH_CMSG_EOF);
268 packet_send();
269 } else {
Damien Miller95def091999-11-25 00:26:21 +1100270 enter_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000271
Damien Miller95def091999-11-25 00:26:21 +1100272 /* Check for immediate EOF on stdin. */
273 len = read(fileno(stdin), buf, 1);
274 if (len == 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100275 /* EOF. Record that we have seen it and send EOF to server. */
Damien Miller95def091999-11-25 00:26:21 +1100276 debug("Sending eof.");
277 stdin_eof = 1;
278 packet_start(SSH_CMSG_EOF);
279 packet_send();
280 } else if (len > 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100281 /*
282 * Got data. We must store the data in the buffer,
283 * and also process it as an escape character if
284 * appropriate.
285 */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000286 if ((u_char) buf[0] == escape_char)
Damien Miller95def091999-11-25 00:26:21 +1100287 escape_pending = 1;
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000288 else
Damien Miller95def091999-11-25 00:26:21 +1100289 buffer_append(&stdin_buffer, buf, 1);
Damien Miller95def091999-11-25 00:26:21 +1100290 }
Damien Miller95def091999-11-25 00:26:21 +1100291 leave_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000292 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000293}
294
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000295
Damien Miller5428f641999-11-25 11:54:57 +1100296/*
297 * Make packets from buffered stdin data, and buffer them for sending to the
298 * connection.
299 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000300
Damien Miller4af51302000-04-16 11:18:38 +1000301void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000302client_make_packets_from_stdin_data(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000303{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000304 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000305
Damien Miller95def091999-11-25 00:26:21 +1100306 /* Send buffered stdin data to the server. */
307 while (buffer_len(&stdin_buffer) > 0 &&
308 packet_not_very_much_data_to_write()) {
309 len = buffer_len(&stdin_buffer);
310 /* Keep the packets at reasonable size. */
311 if (len > packet_get_maxsize())
312 len = packet_get_maxsize();
313 packet_start(SSH_CMSG_STDIN_DATA);
314 packet_put_string(buffer_ptr(&stdin_buffer), len);
315 packet_send();
316 buffer_consume(&stdin_buffer, len);
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000317 stdin_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100318 /* If we have a pending EOF, send it now. */
319 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
320 packet_start(SSH_CMSG_EOF);
321 packet_send();
322 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000323 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000324}
325
Damien Miller5428f641999-11-25 11:54:57 +1100326/*
327 * Checks if the client window has changed, and sends a packet about it to
328 * the server if so. The actual change is detected elsewhere (by a software
329 * interrupt on Unix); this just checks the flag and sends a message if
330 * appropriate.
331 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000332
Damien Miller4af51302000-04-16 11:18:38 +1000333void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000334client_check_window_change(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000335{
Damien Miller1383bd82000-04-06 12:32:37 +1000336 struct winsize ws;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000337
Damien Miller1383bd82000-04-06 12:32:37 +1000338 if (! received_window_change_signal)
339 return;
340 /** XXX race */
341 received_window_change_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000342
Damien Miller1383bd82000-04-06 12:32:37 +1000343 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
344 return;
345
Damien Millerd3444942000-09-30 14:20:03 +1100346 debug2("client_check_window_change: changed");
Damien Miller1383bd82000-04-06 12:32:37 +1000347
348 if (compat20) {
349 channel_request_start(session_ident, "window-change", 0);
350 packet_put_int(ws.ws_col);
351 packet_put_int(ws.ws_row);
352 packet_put_int(ws.ws_xpixel);
353 packet_put_int(ws.ws_ypixel);
354 packet_send();
355 } else {
356 packet_start(SSH_CMSG_WINDOW_SIZE);
357 packet_put_int(ws.ws_row);
358 packet_put_int(ws.ws_col);
359 packet_put_int(ws.ws_xpixel);
360 packet_put_int(ws.ws_ypixel);
361 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000362 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000363}
364
Damien Miller5428f641999-11-25 11:54:57 +1100365/*
366 * Waits until the client can do something (some data becomes available on
367 * one of the file descriptors).
368 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000369
Damien Miller4af51302000-04-16 11:18:38 +1000370void
Damien Miller5e953212001-01-30 09:14:00 +1100371client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000372 int *maxfdp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000373{
Damien Miller5e953212001-01-30 09:14:00 +1100374 /* Add any selections by the channel mechanism. */
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000375 channel_prepare_select(readsetp, writesetp, maxfdp, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000376
Damien Miller1383bd82000-04-06 12:32:37 +1000377 if (!compat20) {
378 /* Read from the connection, unless our buffers are full. */
379 if (buffer_len(&stdout_buffer) < buffer_high &&
380 buffer_len(&stderr_buffer) < buffer_high &&
381 channel_not_very_much_buffered_data())
Damien Miller5e953212001-01-30 09:14:00 +1100382 FD_SET(connection_in, *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000383 /*
384 * Read from stdin, unless we have seen EOF or have very much
385 * buffered data to send to the server.
386 */
387 if (!stdin_eof && packet_not_very_much_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100388 FD_SET(fileno(stdin), *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000389
390 /* Select stdout/stderr if have data in buffer. */
391 if (buffer_len(&stdout_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100392 FD_SET(fileno(stdout), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000393 if (buffer_len(&stderr_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100394 FD_SET(fileno(stderr), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000395 } else {
Damien Miller5e953212001-01-30 09:14:00 +1100396 FD_SET(connection_in, *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000397 }
398
Damien Miller95def091999-11-25 00:26:21 +1100399 /* Select server connection if have data to write to the server. */
400 if (packet_have_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100401 FD_SET(connection_out, *writesetp);
Damien Miller95def091999-11-25 00:26:21 +1100402
Damien Miller5428f641999-11-25 11:54:57 +1100403 /*
404 * Wait for something to happen. This will suspend the process until
405 * some selected descriptor can be read, written, or has some other
406 * event pending. Note: if you want to implement SSH_MSG_IGNORE
407 * messages to fool traffic analysis, this might be the place to do
408 * it: just have a random timeout for the select, and send a random
409 * SSH_MSG_IGNORE packet when the timeout expires.
410 */
Damien Miller95def091999-11-25 00:26:21 +1100411
Damien Miller5e953212001-01-30 09:14:00 +1100412 if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
Damien Miller95def091999-11-25 00:26:21 +1100413 char buf[100];
Ben Lindstromf9452512001-02-15 03:12:08 +0000414
415 /*
416 * We have to clear the select masks, because we return.
417 * We have to return, because the mainloop checks for the flags
418 * set by the signal handlers.
419 */
420 memset(*readsetp, 0, *maxfdp);
421 memset(*writesetp, 0, *maxfdp);
422
Damien Miller95def091999-11-25 00:26:21 +1100423 if (errno == EINTR)
424 return;
425 /* Note: we might still have data in the buffers. */
426 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
427 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100428 quit_pending = 1;
429 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000430}
431
Damien Miller4af51302000-04-16 11:18:38 +1000432void
Damien Millerad833b32000-08-23 10:46:23 +1000433client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000434{
Damien Miller95def091999-11-25 00:26:21 +1100435 struct winsize oldws, newws;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000436
Damien Miller95def091999-11-25 00:26:21 +1100437 /* Flush stdout and stderr buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000438 if (buffer_len(bout) > 0)
439 atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
440 if (buffer_len(berr) > 0)
441 atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000442
Damien Miller95def091999-11-25 00:26:21 +1100443 leave_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000444
Damien Miller5428f641999-11-25 11:54:57 +1100445 /*
446 * Free (and clear) the buffer to reduce the amount of data that gets
447 * written to swap.
448 */
Damien Millerad833b32000-08-23 10:46:23 +1000449 buffer_free(bin);
450 buffer_free(bout);
451 buffer_free(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000452
Damien Miller95def091999-11-25 00:26:21 +1100453 /* Save old window size. */
454 ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000455
Damien Miller95def091999-11-25 00:26:21 +1100456 /* Send the suspend signal to the program itself. */
457 kill(getpid(), SIGTSTP);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000458
Damien Miller95def091999-11-25 00:26:21 +1100459 /* Check if the window size has changed. */
460 if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
461 (oldws.ws_row != newws.ws_row ||
462 oldws.ws_col != newws.ws_col ||
463 oldws.ws_xpixel != newws.ws_xpixel ||
464 oldws.ws_ypixel != newws.ws_ypixel))
465 received_window_change_signal = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000466
Damien Miller95def091999-11-25 00:26:21 +1100467 /* OK, we have been continued by the user. Reinitialize buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000468 buffer_init(bin);
469 buffer_init(bout);
470 buffer_init(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000471
Damien Miller95def091999-11-25 00:26:21 +1100472 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000473}
474
Damien Miller4af51302000-04-16 11:18:38 +1000475void
Damien Miller1383bd82000-04-06 12:32:37 +1000476client_process_net_input(fd_set * readset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000477{
Damien Miller1383bd82000-04-06 12:32:37 +1000478 int len;
479 char buf[8192];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000480
Damien Miller5428f641999-11-25 11:54:57 +1100481 /*
482 * Read input from the server, and add any such data to the buffer of
483 * the packet subsystem.
484 */
Damien Miller95def091999-11-25 00:26:21 +1100485 if (FD_ISSET(connection_in, readset)) {
486 /* Read as much as possible. */
487 len = read(connection_in, buf, sizeof(buf));
488 if (len == 0) {
489 /* Received EOF. The remote host has closed the connection. */
490 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
491 host);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000492 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000493 quit_pending = 1;
494 return;
Damien Miller95def091999-11-25 00:26:21 +1100495 }
Damien Miller5428f641999-11-25 11:54:57 +1100496 /*
497 * There is a kernel bug on Solaris that causes select to
498 * sometimes wake up even though there is no data available.
499 */
Ben Lindstromebc88272001-03-06 03:34:40 +0000500 if (len < 0 && (errno == EAGAIN || errno == EINTR))
Damien Miller95def091999-11-25 00:26:21 +1100501 len = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000502
Damien Miller95def091999-11-25 00:26:21 +1100503 if (len < 0) {
504 /* An error has encountered. Perhaps there is a network problem. */
505 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
506 host, strerror(errno));
507 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100508 quit_pending = 1;
509 return;
510 }
511 packet_process_incoming(buf, len);
512 }
Damien Miller1383bd82000-04-06 12:32:37 +1000513}
514
Damien Millerad833b32000-08-23 10:46:23 +1000515/* process the characters one by one */
516int
517process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
518{
519 char string[1024];
520 pid_t pid;
521 int bytes = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000522 u_int i;
523 u_char ch;
Damien Millerad833b32000-08-23 10:46:23 +1000524 char *s;
525
526 for (i = 0; i < len; i++) {
527 /* Get one character at a time. */
528 ch = buf[i];
529
530 if (escape_pending) {
531 /* We have previously seen an escape character. */
532 /* Clear the flag now. */
533 escape_pending = 0;
534
535 /* Process the escaped character. */
536 switch (ch) {
537 case '.':
538 /* Terminate the connection. */
539 snprintf(string, sizeof string, "%c.\r\n", escape_char);
540 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +1000541
542 quit_pending = 1;
543 return -1;
544
545 case 'Z' - 64:
546 /* Suspend the program. */
547 /* Print a message to that effect to the user. */
548 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
549 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +1000550
551 /* Restore terminal modes and suspend. */
552 client_suspend_self(bin, bout, berr);
553
554 /* We have been continued. */
555 continue;
556
Ben Lindstromf28f6342001-04-04 02:03:04 +0000557 case 'R':
Ben Lindstrom11bd8992001-04-05 23:34:29 +0000558 if (compat20) {
559 if (datafellows & SSH_BUG_NOREKEY)
560 log("Server does not support re-keying");
561 else
562 need_rekeying = 1;
563 }
Ben Lindstromf28f6342001-04-04 02:03:04 +0000564 continue;
565
Damien Millerad833b32000-08-23 10:46:23 +1000566 case '&':
567 /* XXX does not work yet with proto 2 */
568 if (compat20)
569 continue;
570 /*
571 * Detach the program (continue to serve connections,
572 * but put in background and no more new connections).
573 */
574 if (!stdin_eof) {
575 /*
576 * Sending SSH_CMSG_EOF alone does not always appear
577 * to be enough. So we try to send an EOF character
578 * first.
579 */
580 packet_start(SSH_CMSG_STDIN_DATA);
581 packet_put_string("\004", 1);
582 packet_send();
583 /* Close stdin. */
584 stdin_eof = 1;
585 if (buffer_len(bin) == 0) {
586 packet_start(SSH_CMSG_EOF);
587 packet_send();
588 }
589 }
590 /* Restore tty modes. */
591 leave_raw_mode();
592
593 /* Stop listening for new connections. */
594 channel_stop_listening();
595
596 printf("%c& [backgrounded]\n", escape_char);
597
598 /* Fork into background. */
599 pid = fork();
600 if (pid < 0) {
601 error("fork: %.100s", strerror(errno));
602 continue;
603 }
604 if (pid != 0) { /* This is the parent. */
605 /* The parent just exits. */
606 exit(0);
607 }
608 /* The child continues serving connections. */
609 continue; /*XXX ? */
610
611 case '?':
612 snprintf(string, sizeof string,
613"%c?\r\n\
614Supported escape sequences:\r\n\
615~. - terminate connection\r\n\
616~^Z - suspend ssh\r\n\
617~# - list forwarded connections\r\n\
618~& - background ssh (when waiting for connections to terminate)\r\n\
619~? - this message\r\n\
620~~ - send the escape character by typing it twice\r\n\
621(Note that escapes are only recognized immediately after newline.)\r\n",
622 escape_char);
623 buffer_append(berr, string, strlen(string));
624 continue;
625
626 case '#':
627 snprintf(string, sizeof string, "%c#\r\n", escape_char);
628 buffer_append(berr, string, strlen(string));
629 s = channel_open_message();
630 buffer_append(berr, s, strlen(s));
631 xfree(s);
632 continue;
633
634 default:
635 if (ch != escape_char) {
636 buffer_put_char(bin, escape_char);
637 bytes++;
638 }
639 /* Escaped characters fall through here */
640 break;
641 }
642 } else {
643 /*
644 * The previous character was not an escape char. Check if this
645 * is an escape.
646 */
647 if (last_was_cr && ch == escape_char) {
648 /* It is. Set the flag and continue to next character. */
649 escape_pending = 1;
650 continue;
651 }
652 }
653
654 /*
655 * Normal character. Record whether it was a newline,
656 * and append it to the buffer.
657 */
658 last_was_cr = (ch == '\r' || ch == '\n');
659 buffer_put_char(bin, ch);
660 bytes++;
661 }
662 return bytes;
663}
664
Damien Miller4af51302000-04-16 11:18:38 +1000665void
Damien Miller1383bd82000-04-06 12:32:37 +1000666client_process_input(fd_set * readset)
667{
Damien Miller166fca82000-04-20 07:42:21 +1000668 int len;
Damien Millerad833b32000-08-23 10:46:23 +1000669 char buf[8192];
Damien Miller1383bd82000-04-06 12:32:37 +1000670
Damien Miller95def091999-11-25 00:26:21 +1100671 /* Read input from stdin. */
672 if (FD_ISSET(fileno(stdin), readset)) {
673 /* Read as much as possible. */
674 len = read(fileno(stdin), buf, sizeof(buf));
675 if (len <= 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100676 /*
677 * Received EOF or error. They are treated
678 * similarly, except that an error message is printed
679 * if it was an error condition.
680 */
Damien Miller95def091999-11-25 00:26:21 +1100681 if (len < 0) {
682 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
683 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100684 }
685 /* Mark that we have seen EOF. */
686 stdin_eof = 1;
Damien Miller5428f641999-11-25 11:54:57 +1100687 /*
688 * Send an EOF message to the server unless there is
689 * data in the buffer. If there is data in the
690 * buffer, no message will be sent now. Code
691 * elsewhere will send the EOF when the buffer
692 * becomes empty if stdin_eof is set.
693 */
Damien Miller95def091999-11-25 00:26:21 +1100694 if (buffer_len(&stdin_buffer) == 0) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000695 packet_start(SSH_CMSG_EOF);
696 packet_send();
Damien Miller95def091999-11-25 00:26:21 +1100697 }
698 } else if (escape_char == -1) {
Damien Miller5428f641999-11-25 11:54:57 +1100699 /*
700 * Normal successful read, and no escape character.
701 * Just append the data to buffer.
702 */
Damien Miller95def091999-11-25 00:26:21 +1100703 buffer_append(&stdin_buffer, buf, len);
Damien Miller95def091999-11-25 00:26:21 +1100704 } else {
Damien Miller5428f641999-11-25 11:54:57 +1100705 /*
706 * Normal, successful read. But we have an escape character
707 * and have to process the characters one by one.
708 */
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000709 if (process_escapes(&stdin_buffer, &stdout_buffer,
710 &stderr_buffer, buf, len) == -1)
Damien Millerad833b32000-08-23 10:46:23 +1000711 return;
Damien Miller95def091999-11-25 00:26:21 +1100712 }
713 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000714}
715
Damien Miller4af51302000-04-16 11:18:38 +1000716void
Damien Miller95def091999-11-25 00:26:21 +1100717client_process_output(fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000718{
Damien Miller95def091999-11-25 00:26:21 +1100719 int len;
720 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000721
Damien Miller95def091999-11-25 00:26:21 +1100722 /* Write buffered output to stdout. */
723 if (FD_ISSET(fileno(stdout), writeset)) {
724 /* Write as much data as possible. */
725 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +1100726 buffer_len(&stdout_buffer));
Damien Miller95def091999-11-25 00:26:21 +1100727 if (len <= 0) {
728 if (errno == EAGAIN)
729 len = 0;
730 else {
Damien Miller5428f641999-11-25 11:54:57 +1100731 /*
732 * An error or EOF was encountered. Put an
733 * error message to stderr buffer.
734 */
Damien Miller95def091999-11-25 00:26:21 +1100735 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
736 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100737 quit_pending = 1;
738 return;
739 }
740 }
741 /* Consume printed data from the buffer. */
742 buffer_consume(&stdout_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +0000743 stdout_bytes += len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000744 }
Damien Miller95def091999-11-25 00:26:21 +1100745 /* Write buffered output to stderr. */
746 if (FD_ISSET(fileno(stderr), writeset)) {
747 /* Write as much data as possible. */
748 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +1100749 buffer_len(&stderr_buffer));
Damien Miller95def091999-11-25 00:26:21 +1100750 if (len <= 0) {
751 if (errno == EAGAIN)
752 len = 0;
753 else {
Damien Miller5428f641999-11-25 11:54:57 +1100754 /* EOF or error, but can't even print error message. */
Damien Miller95def091999-11-25 00:26:21 +1100755 quit_pending = 1;
756 return;
757 }
758 }
759 /* Consume printed characters from the buffer. */
760 buffer_consume(&stderr_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +0000761 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100762 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000763}
764
Damien Miller5428f641999-11-25 11:54:57 +1100765/*
Damien Millerb38eff82000-04-01 11:09:21 +1000766 * Get packets from the connection input buffer, and process them as long as
767 * there are packets available.
768 *
769 * Any unknown packets received during the actual
770 * session cause the session to terminate. This is
771 * intended to make debugging easier since no
772 * confirmations are sent. Any compatible protocol
773 * extensions must be negotiated during the
774 * preparatory phase.
775 */
776
Damien Miller4af51302000-04-16 11:18:38 +1000777void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000778client_process_buffered_input_packets(void)
Damien Millerb38eff82000-04-01 11:09:21 +1000779{
Ben Lindstromf28f6342001-04-04 02:03:04 +0000780 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000781}
782
Damien Millerad833b32000-08-23 10:46:23 +1000783/* scan buf[] for '~' before sending data to the peer */
784
785int
786simple_escape_filter(Channel *c, char *buf, int len)
787{
788 /* XXX we assume c->extended is writeable */
789 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
790}
791
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +0000792void
793client_channel_closed(int id, void *arg)
794{
795 if (id != session_ident)
796 error("client_channel_closed: id %d != session_ident %d",
797 id, session_ident);
798 session_closed = 1;
Ben Lindstromd3447632001-04-08 18:07:22 +0000799 if (in_raw_mode)
800 leave_raw_mode();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +0000801}
802
Damien Millerb38eff82000-04-01 11:09:21 +1000803/*
Damien Miller5428f641999-11-25 11:54:57 +1100804 * Implements the interactive session with the server. This is called after
805 * the user has been authenticated, and a command has been started on the
806 * remote host. If escape_char != -1, it is the character used as an escape
807 * character for terminating or suspending the session.
808 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000809
Damien Miller4af51302000-04-16 11:18:38 +1000810int
Damien Millerad833b32000-08-23 10:46:23 +1000811client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000812{
Damien Miller5e953212001-01-30 09:14:00 +1100813 fd_set *readset = NULL, *writeset = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100814 double start_time, total_time;
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000815 int max_fd = 0, len, rekeying = 0;
Damien Miller95def091999-11-25 00:26:21 +1100816 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000817
Damien Miller95def091999-11-25 00:26:21 +1100818 debug("Entering interactive session.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000819
Damien Miller95def091999-11-25 00:26:21 +1100820 start_time = get_current_time();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000821
Damien Miller95def091999-11-25 00:26:21 +1100822 /* Initialize variables. */
823 escape_pending = 0;
824 last_was_cr = 1;
825 exit_status = -1;
826 stdin_eof = 0;
827 buffer_high = 64 * 1024;
828 connection_in = packet_get_connection_in();
829 connection_out = packet_get_connection_out();
Damien Miller5e953212001-01-30 09:14:00 +1100830 max_fd = MAX(connection_in, connection_out);
831
832 if (!compat20) {
833 max_fd = MAX(max_fd, fileno(stdin));
834 max_fd = MAX(max_fd, fileno(stdout));
835 max_fd = MAX(max_fd, fileno(stderr));
836 }
Damien Miller95def091999-11-25 00:26:21 +1100837 stdin_bytes = 0;
838 stdout_bytes = 0;
839 stderr_bytes = 0;
840 quit_pending = 0;
841 escape_char = escape_char_arg;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000842
Damien Miller95def091999-11-25 00:26:21 +1100843 /* Initialize buffers. */
844 buffer_init(&stdin_buffer);
845 buffer_init(&stdout_buffer);
846 buffer_init(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000847
Damien Millerb38eff82000-04-01 11:09:21 +1000848 client_init_dispatch();
849
Damien Miller95def091999-11-25 00:26:21 +1100850 /* Set signal handlers to restore non-blocking mode. */
851 signal(SIGINT, signal_handler);
852 signal(SIGQUIT, signal_handler);
853 signal(SIGTERM, signal_handler);
854 signal(SIGPIPE, SIG_IGN);
855 if (have_pty)
856 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000857
Damien Miller95def091999-11-25 00:26:21 +1100858 if (have_pty)
859 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000860
Ben Lindstrom5b828322001-02-09 01:34:36 +0000861 if (compat20) {
862 session_ident = ssh2_chan_id;
863 if (escape_char != -1)
864 channel_register_filter(session_ident,
865 simple_escape_filter);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +0000866 if (session_ident != -1)
867 channel_register_cleanup(session_ident,
868 client_channel_closed);
Ben Lindstrom5b828322001-02-09 01:34:36 +0000869 } else {
870 /* Check if we should immediately send eof on stdin. */
Damien Miller1383bd82000-04-06 12:32:37 +1000871 client_check_initial_eof_on_stdin();
Ben Lindstrom5b828322001-02-09 01:34:36 +0000872 }
Damien Millerad833b32000-08-23 10:46:23 +1000873
Damien Miller95def091999-11-25 00:26:21 +1100874 /* Main loop of the client for the interactive session mode. */
875 while (!quit_pending) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000876
Damien Miller5428f641999-11-25 11:54:57 +1100877 /* Process buffered packets sent by the server. */
Damien Miller95def091999-11-25 00:26:21 +1100878 client_process_buffered_input_packets();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000879
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +0000880 if (compat20 && session_closed && !channel_still_open())
Damien Miller1383bd82000-04-06 12:32:37 +1000881 break;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +0000882
883 rekeying = (xxx_kex != NULL && !xxx_kex->done);
Damien Miller1383bd82000-04-06 12:32:37 +1000884
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000885 if (rekeying) {
886 debug("rekeying in progress");
887 } else {
888 /*
889 * Make packets of buffered stdin data, and buffer
890 * them for sending to the server.
891 */
892 if (!compat20)
893 client_make_packets_from_stdin_data();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000894
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000895 /*
896 * Make packets from buffered channel data, and
897 * enqueue them for sending to the server.
898 */
899 if (packet_not_very_much_data_to_write())
900 channel_output_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000901
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000902 /*
903 * Check if the window size has changed, and buffer a
904 * message about it to the server if so.
905 */
906 client_check_window_change();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000907
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000908 if (quit_pending)
909 break;
910 }
Damien Miller5428f641999-11-25 11:54:57 +1100911 /*
912 * Wait until we have something to do (something becomes
913 * available on one of the descriptors).
914 */
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000915 client_wait_until_can_do_something(&readset, &writeset,
916 &max_fd, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000917
Damien Miller95def091999-11-25 00:26:21 +1100918 if (quit_pending)
919 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000920
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000921 /* Do channel operations unless rekeying in progress. */
922 if (!rekeying) {
923 channel_after_select(readset, writeset);
924
925 if (need_rekeying) {
926 debug("user requests rekeying");
927 xxx_kex->done = 0;
928 kex_send_kexinit(xxx_kex);
929 need_rekeying = 0;
930 }
931 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000932
Damien Miller1383bd82000-04-06 12:32:37 +1000933 /* Buffer input from the connection. */
Damien Miller5e953212001-01-30 09:14:00 +1100934 client_process_net_input(readset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000935
Damien Miller1383bd82000-04-06 12:32:37 +1000936 if (quit_pending)
937 break;
938
939 if (!compat20) {
940 /* Buffer data from stdin */
Damien Miller5e953212001-01-30 09:14:00 +1100941 client_process_input(readset);
Damien Miller1383bd82000-04-06 12:32:37 +1000942 /*
943 * Process output to stdout and stderr. Output to
944 * the connection is processed elsewhere (above).
945 */
Damien Miller5e953212001-01-30 09:14:00 +1100946 client_process_output(writeset);
Damien Miller1383bd82000-04-06 12:32:37 +1000947 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000948
Damien Miller5428f641999-11-25 11:54:57 +1100949 /* Send as much buffered packet data as possible to the sender. */
Damien Miller5e953212001-01-30 09:14:00 +1100950 if (FD_ISSET(connection_out, writeset))
Damien Miller95def091999-11-25 00:26:21 +1100951 packet_write_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000952 }
Damien Miller5e953212001-01-30 09:14:00 +1100953 if (readset)
954 xfree(readset);
955 if (writeset)
956 xfree(writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000957
Damien Miller95def091999-11-25 00:26:21 +1100958 /* Terminate the session. */
959
960 /* Stop watching for window change. */
961 if (have_pty)
962 signal(SIGWINCH, SIG_DFL);
963
964 /* Stop listening for connections. */
965 channel_stop_listening();
966
Damien Miller5428f641999-11-25 11:54:57 +1100967 /*
968 * In interactive mode (with pseudo tty) display a message indicating
969 * that the connection has been closed.
970 */
Damien Miller95def091999-11-25 00:26:21 +1100971 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
972 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
973 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000974 }
Damien Miller95def091999-11-25 00:26:21 +1100975 /* Output any buffered data for stdout. */
976 while (buffer_len(&stdout_buffer) > 0) {
977 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +1100978 buffer_len(&stdout_buffer));
Damien Miller95def091999-11-25 00:26:21 +1100979 if (len <= 0) {
980 error("Write failed flushing stdout buffer.");
981 break;
982 }
983 buffer_consume(&stdout_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +0000984 stdout_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100985 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000986
Damien Miller95def091999-11-25 00:26:21 +1100987 /* Output any buffered data for stderr. */
988 while (buffer_len(&stderr_buffer) > 0) {
989 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +1100990 buffer_len(&stderr_buffer));
Damien Miller95def091999-11-25 00:26:21 +1100991 if (len <= 0) {
992 error("Write failed flushing stderr buffer.");
993 break;
994 }
995 buffer_consume(&stderr_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +0000996 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100997 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000998
Damien Miller95def091999-11-25 00:26:21 +1100999 if (have_pty)
1000 leave_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001001
Damien Miller95def091999-11-25 00:26:21 +11001002 /* Clear and free any buffers. */
1003 memset(buf, 0, sizeof(buf));
1004 buffer_free(&stdin_buffer);
1005 buffer_free(&stdout_buffer);
1006 buffer_free(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001007
Damien Miller95def091999-11-25 00:26:21 +11001008 /* Report bytes transferred, and transfer rates. */
1009 total_time = get_current_time() - start_time;
1010 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1011 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1012 if (total_time > 0)
1013 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1014 stdin_bytes / total_time, stdout_bytes / total_time,
1015 stderr_bytes / total_time);
1016
1017 /* Return the exit status of the program. */
1018 debug("Exit status %d", exit_status);
1019 return exit_status;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001020}
Damien Millerb38eff82000-04-01 11:09:21 +10001021
1022/*********/
1023
1024void
Damien Miller62cee002000-09-23 17:15:56 +11001025client_input_stdout_data(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001026{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001027 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001028 char *data = packet_get_string(&data_len);
1029 packet_integrity_check(plen, 4 + data_len, type);
1030 buffer_append(&stdout_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001031 memset(data, 0, data_len);
1032 xfree(data);
1033}
1034void
Damien Miller62cee002000-09-23 17:15:56 +11001035client_input_stderr_data(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001036{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001037 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001038 char *data = packet_get_string(&data_len);
1039 packet_integrity_check(plen, 4 + data_len, type);
1040 buffer_append(&stderr_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001041 memset(data, 0, data_len);
1042 xfree(data);
1043}
1044void
Damien Miller62cee002000-09-23 17:15:56 +11001045client_input_exit_status(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001046{
1047 packet_integrity_check(plen, 4, type);
1048 exit_status = packet_get_int();
1049 /* Acknowledge the exit. */
1050 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1051 packet_send();
1052 /*
1053 * Must wait for packet to be sent since we are
1054 * exiting the loop.
1055 */
1056 packet_write_wait();
1057 /* Flag that we want to exit. */
1058 quit_pending = 1;
1059}
1060
Damien Miller0bc1bd82000-11-13 22:57:25 +11001061Channel *
1062client_request_forwarded_tcpip(const char *request_type, int rchan)
1063{
1064 Channel* c = NULL;
1065 char *listen_address, *originator_address;
1066 int listen_port, originator_port;
1067 int sock, newch;
1068
1069 /* Get rest of the packet */
1070 listen_address = packet_get_string(NULL);
1071 listen_port = packet_get_int();
1072 originator_address = packet_get_string(NULL);
1073 originator_port = packet_get_int();
1074 packet_done();
1075
1076 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1077 listen_address, listen_port, originator_address, originator_port);
1078
1079 sock = channel_connect_by_listen_adress(listen_port);
1080 if (sock >= 0) {
1081 newch = channel_new("forwarded-tcpip",
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001082 SSH_CHANNEL_CONNECTING, sock, sock, -1,
Damien Miller0bc1bd82000-11-13 22:57:25 +11001083 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1084 xstrdup(originator_address), 1);
1085 c = channel_lookup(newch);
1086 }
1087 xfree(originator_address);
1088 xfree(listen_address);
1089 return c;
1090}
1091
1092Channel*
1093client_request_x11(const char *request_type, int rchan)
1094{
1095 Channel *c = NULL;
1096 char *originator;
1097 int originator_port;
1098 int sock, newch;
1099
1100 if (!options.forward_x11) {
1101 error("Warning: ssh server tried X11 forwarding.");
1102 error("Warning: this is probably a break in attempt by a malicious server.");
1103 return NULL;
1104 }
1105 originator = packet_get_string(NULL);
1106 if (datafellows & SSH_BUG_X11FWD) {
1107 debug2("buggy server: x11 request w/o originator_port");
1108 originator_port = 0;
1109 } else {
1110 originator_port = packet_get_int();
1111 }
1112 packet_done();
1113 /* XXX check permission */
Damien Millerd83ff352001-01-30 09:19:34 +11001114 debug("client_request_x11: request from %s %d", originator,
1115 originator_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001116 sock = x11_connect_display();
1117 if (sock >= 0) {
1118 newch = channel_new("x11",
1119 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1120 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
1121 xstrdup("x11"), 1);
1122 c = channel_lookup(newch);
1123 }
1124 xfree(originator);
1125 return c;
1126}
1127
1128Channel*
1129client_request_agent(const char *request_type, int rchan)
1130{
1131 Channel *c = NULL;
1132 int sock, newch;
1133
1134 if (!options.forward_agent) {
1135 error("Warning: ssh server tried agent forwarding.");
1136 error("Warning: this is probably a break in attempt by a malicious server.");
1137 return NULL;
1138 }
1139 sock = ssh_get_authentication_socket();
1140 if (sock >= 0) {
1141 newch = channel_new("authentication agent connection",
1142 SSH_CHANNEL_OPEN, sock, sock, -1,
1143 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1144 xstrdup("authentication agent connection"), 1);
1145 c = channel_lookup(newch);
1146 }
1147 return c;
1148}
1149
Damien Millerbd483e72000-04-30 10:00:53 +10001150/* XXXX move to generic input handler */
1151void
Damien Miller62cee002000-09-23 17:15:56 +11001152client_input_channel_open(int type, int plen, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10001153{
1154 Channel *c = NULL;
1155 char *ctype;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001156 u_int len;
Damien Millerbd483e72000-04-30 10:00:53 +10001157 int rchan;
1158 int rmaxpack;
1159 int rwindow;
1160
1161 ctype = packet_get_string(&len);
1162 rchan = packet_get_int();
1163 rwindow = packet_get_int();
1164 rmaxpack = packet_get_int();
1165
Damien Millere247cc42000-05-07 12:03:14 +10001166 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
Damien Millerbd483e72000-04-30 10:00:53 +10001167 ctype, rchan, rwindow, rmaxpack);
1168
Damien Miller0bc1bd82000-11-13 22:57:25 +11001169 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1170 c = client_request_forwarded_tcpip(ctype, rchan);
1171 } else if (strcmp(ctype, "x11") == 0) {
1172 c = client_request_x11(ctype, rchan);
1173 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1174 c = client_request_agent(ctype, rchan);
Damien Millerbd483e72000-04-30 10:00:53 +10001175 }
1176/* XXX duplicate : */
1177 if (c != NULL) {
1178 debug("confirm %s", ctype);
1179 c->remote_id = rchan;
1180 c->remote_window = rwindow;
1181 c->remote_maxpacket = rmaxpack;
1182
1183 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1184 packet_put_int(c->remote_id);
1185 packet_put_int(c->self);
1186 packet_put_int(c->local_window);
1187 packet_put_int(c->local_maxpacket);
1188 packet_send();
1189 } else {
1190 debug("failure %s", ctype);
1191 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1192 packet_put_int(rchan);
1193 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1194 packet_put_cstring("bla bla");
1195 packet_put_cstring("");
1196 packet_send();
1197 }
1198 xfree(ctype);
1199}
Ben Lindstrom5b828322001-02-09 01:34:36 +00001200void
1201client_input_channel_req(int type, int plen, void *ctxt)
1202{
1203 Channel *c = NULL;
1204 int id, reply, success = 0;
1205 char *rtype;
1206
1207 id = packet_get_int();
1208 rtype = packet_get_string(NULL);
1209 reply = packet_get_char();
1210
1211 debug("client_input_channel_req: channel %d rtype %s reply %d",
1212 id, rtype, reply);
1213
1214 if (session_ident == -1) {
1215 error("client_input_channel_req: no channel %d", session_ident);
1216 } else if (id != session_ident) {
1217 error("client_input_channel_req: channel %d: wrong channel: %d",
1218 session_ident, id);
1219 }
1220 c = channel_lookup(id);
1221 if (c == NULL) {
1222 error("client_input_channel_req: channel %d: unknown channel", id);
1223 } else if (strcmp(rtype, "exit-status") == 0) {
1224 success = 1;
1225 exit_status = packet_get_int();
1226 packet_done();
1227 }
1228 if (reply) {
1229 packet_start(success ?
1230 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1231 packet_put_int(c->remote_id);
1232 packet_send();
1233 }
1234 xfree(rtype);
1235}
Damien Millerbd483e72000-04-30 10:00:53 +10001236
Damien Miller4af51302000-04-16 11:18:38 +10001237void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001238client_init_dispatch_20(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001239{
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001240 dispatch_init(&dispatch_protocol_error);
Damien Miller1383bd82000-04-06 12:32:37 +10001241 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1242 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1243 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1244 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
Damien Millerbd483e72000-04-30 10:00:53 +10001245 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
Damien Miller1383bd82000-04-06 12:32:37 +10001246 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1247 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001248 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
Damien Miller1383bd82000-04-06 12:32:37 +10001249 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001250
1251 /* rekeying */
1252 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
Damien Miller1383bd82000-04-06 12:32:37 +10001253}
Damien Miller4af51302000-04-16 11:18:38 +10001254void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001255client_init_dispatch_13(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001256{
1257 dispatch_init(NULL);
1258 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1259 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1260 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
Damien Millerb38eff82000-04-01 11:09:21 +10001261 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1262 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1263 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001264 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1265 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1266 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
Damien Miller69b69aa2000-10-28 14:19:58 +11001267
1268 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1269 &auth_input_open_request : &deny_input_open);
1270 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1271 &x11_input_open : &deny_input_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001272}
Damien Miller4af51302000-04-16 11:18:38 +10001273void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001274client_init_dispatch_15(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001275{
1276 client_init_dispatch_13();
1277 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1278 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1279}
Damien Miller4af51302000-04-16 11:18:38 +10001280void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001281client_init_dispatch(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001282{
Damien Miller1383bd82000-04-06 12:32:37 +10001283 if (compat20)
1284 client_init_dispatch_20();
1285 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001286 client_init_dispatch_13();
1287 else
1288 client_init_dispatch_15();
1289}