blob: 1591215bdabfcf889e98d9ba701338d63c42aa02 [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.
Ben Lindstrom44697232001-07-04 03:32:30 +000038 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110039 *
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"
Darren Tucker47eede72005-03-14 23:08:12 +110062RCSID("$OpenBSD: clientloop.c,v 1.136 2005/03/10 22:01:05 deraadt 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"
Ben Lindstromc7637672001-06-09 00:36:26 +000071#include "channels.h"
Damien Millerb38eff82000-04-01 11:09:21 +100072#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"
Darren Tucker06f2bd82004-05-13 16:06:46 +100082#include "sshpty.h"
Ben Lindstrom302ea6f2001-04-16 02:01:25 +000083#include "misc.h"
Damien Miller0e220db2004-06-15 10:34:08 +100084#include "monitor_fdpass.h"
85#include "match.h"
86#include "msg.h"
Damien Miller69b69aa2000-10-28 14:19:58 +110087
88/* import options */
89extern Options options;
90
Damien Millerd4a8b7e1999-10-27 13:42:43 +100091/* Flag indicating that stdin should be redirected from /dev/null. */
92extern int stdin_null_flag;
93
Damien Millerd6965512003-12-17 16:31:53 +110094/* Flag indicating that no shell has been requested */
95extern int no_shell_flag;
96
Damien Miller0e220db2004-06-15 10:34:08 +100097/* Control socket */
98extern int control_fd;
99
Damien Miller5428f641999-11-25 11:54:57 +1100100/*
101 * Name of the host we are connecting to. This is the name given on the
102 * command line, or the HostName specified for the user-supplied name in a
103 * configuration file.
104 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000105extern char *host;
106
Damien Miller5428f641999-11-25 11:54:57 +1100107/*
108 * Flag to indicate that we have received a window change signal which has
109 * not yet been processed. This will cause a message indicating the new
110 * window size to be sent to the server a little later. This is volatile
111 * because this is updated in a signal handler.
112 */
Ben Lindstrom5e71c542001-12-06 16:48:14 +0000113static volatile sig_atomic_t received_window_change_signal = 0;
114static volatile sig_atomic_t received_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000115
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000116/* Flag indicating whether the user\'s terminal is in non-blocking mode. */
117static int in_non_blocking_mode = 0;
118
119/* Common data for the client loop code. */
Damien Millerad833b32000-08-23 10:46:23 +1000120static int quit_pending; /* Set to non-zero to quit the client loop. */
121static int escape_char; /* Escape character. */
Damien Miller95def091999-11-25 00:26:21 +1100122static int escape_pending; /* Last character was the escape character */
123static int last_was_cr; /* Last character was a newline. */
124static int exit_status; /* Used to store the exit status of the command. */
125static int stdin_eof; /* EOF has been encountered on standard error. */
126static Buffer stdin_buffer; /* Buffer for stdin data. */
127static Buffer stdout_buffer; /* Buffer for stdout data. */
128static Buffer stderr_buffer; /* Buffer for stderr data. */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000129static u_long stdin_bytes, stdout_bytes, stderr_bytes;
130static u_int buffer_high;/* Soft max buffer size. */
Damien Miller95def091999-11-25 00:26:21 +1100131static int connection_in; /* Connection to server (input). */
132static int connection_out; /* Connection to server (output). */
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000133static int need_rekeying; /* Set to non-zero if rekeying is requested. */
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +0000134static int session_closed = 0; /* In SSH2: login session closed. */
Damien Miller509b0102003-12-17 16:33:10 +1100135static int server_alive_timeouts = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000136
Ben Lindstrombba81212001-06-25 05:01:22 +0000137static void client_init_dispatch(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000138int session_ident = -1;
139
Damien Miller0e220db2004-06-15 10:34:08 +1000140struct confirm_ctx {
141 int want_tty;
142 int want_subsys;
143 Buffer cmd;
144 char *term;
145 struct termios tio;
Damien Miller3756dce2004-06-18 01:17:29 +1000146 char **env;
Damien Miller0e220db2004-06-15 10:34:08 +1000147};
148
Ben Lindstromf28f6342001-04-04 02:03:04 +0000149/*XXX*/
150extern Kex *xxx_kex;
151
Damien Miller0e220db2004-06-15 10:34:08 +1000152void ssh_process_session2_setup(int, int, int, Buffer *);
153
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000154/* Restores stdin to blocking mode. */
155
Ben Lindstrombba81212001-06-25 05:01:22 +0000156static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000157leave_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000158{
Damien Miller95def091999-11-25 00:26:21 +1100159 if (in_non_blocking_mode) {
Damien Miller03e66f62004-06-15 15:47:51 +1000160 unset_nonblock(fileno(stdin));
Damien Miller95def091999-11-25 00:26:21 +1100161 in_non_blocking_mode = 0;
Damien Miller95def091999-11-25 00:26:21 +1100162 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000163}
164
Damien Miller95def091999-11-25 00:26:21 +1100165/* Puts stdin terminal in non-blocking mode. */
166
Ben Lindstrombba81212001-06-25 05:01:22 +0000167static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000168enter_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000169{
Damien Miller95def091999-11-25 00:26:21 +1100170 in_non_blocking_mode = 1;
Damien Miller232711f2004-06-15 10:35:30 +1000171 set_nonblock(fileno(stdin));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000172}
173
Damien Miller5428f641999-11-25 11:54:57 +1100174/*
175 * Signal handler for the window change signal (SIGWINCH). This just sets a
176 * flag indicating that the window has changed.
177 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000178
Ben Lindstrombba81212001-06-25 05:01:22 +0000179static void
Damien Miller95def091999-11-25 00:26:21 +1100180window_change_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000181{
Damien Miller95def091999-11-25 00:26:21 +1100182 received_window_change_signal = 1;
183 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000184}
185
Damien Miller5428f641999-11-25 11:54:57 +1100186/*
187 * Signal handler for signals that cause the program to terminate. These
188 * signals must be trapped to restore terminal modes.
189 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000190
Ben Lindstrombba81212001-06-25 05:01:22 +0000191static void
Damien Miller95def091999-11-25 00:26:21 +1100192signal_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000193{
Ben Lindstromec46e0b2001-06-09 01:27:31 +0000194 received_signal = sig;
195 quit_pending = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000196}
197
Damien Miller5428f641999-11-25 11:54:57 +1100198/*
199 * Returns current time in seconds from Jan 1, 1970 with the maximum
200 * available resolution.
201 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000202
Ben Lindstrombba81212001-06-25 05:01:22 +0000203static double
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000204get_current_time(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000205{
Damien Miller95def091999-11-25 00:26:21 +1100206 struct timeval tv;
207 gettimeofday(&tv, NULL);
208 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000209}
210
Damien Miller5428f641999-11-25 11:54:57 +1100211/*
212 * This is called when the interactive is entered. This checks if there is
213 * an EOF coming on stdin. We must check this explicitly, as select() does
214 * not appear to wake up when redirecting from /dev/null.
215 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000216
Ben Lindstrombba81212001-06-25 05:01:22 +0000217static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000218client_check_initial_eof_on_stdin(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000219{
Damien Miller95def091999-11-25 00:26:21 +1100220 int len;
221 char buf[1];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000222
Damien Miller5428f641999-11-25 11:54:57 +1100223 /*
224 * If standard input is to be "redirected from /dev/null", we simply
225 * mark that we have seen an EOF and send an EOF message to the
226 * server. Otherwise, we try to read a single character; it appears
227 * that for some files, such /dev/null, select() never wakes up for
228 * read for this descriptor, which means that we never get EOF. This
229 * way we will get the EOF if stdin comes from /dev/null or similar.
230 */
Damien Miller95def091999-11-25 00:26:21 +1100231 if (stdin_null_flag) {
232 /* Fake EOF on stdin. */
233 debug("Sending eof.");
234 stdin_eof = 1;
235 packet_start(SSH_CMSG_EOF);
236 packet_send();
237 } else {
Damien Miller95def091999-11-25 00:26:21 +1100238 enter_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000239
Damien Miller95def091999-11-25 00:26:21 +1100240 /* Check for immediate EOF on stdin. */
241 len = read(fileno(stdin), buf, 1);
242 if (len == 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100243 /* EOF. Record that we have seen it and send EOF to server. */
Damien Miller95def091999-11-25 00:26:21 +1100244 debug("Sending eof.");
245 stdin_eof = 1;
246 packet_start(SSH_CMSG_EOF);
247 packet_send();
248 } else if (len > 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100249 /*
250 * Got data. We must store the data in the buffer,
251 * and also process it as an escape character if
252 * appropriate.
253 */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000254 if ((u_char) buf[0] == escape_char)
Damien Miller95def091999-11-25 00:26:21 +1100255 escape_pending = 1;
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000256 else
Damien Miller95def091999-11-25 00:26:21 +1100257 buffer_append(&stdin_buffer, buf, 1);
Damien Miller95def091999-11-25 00:26:21 +1100258 }
Damien Miller95def091999-11-25 00:26:21 +1100259 leave_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000260 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000261}
262
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000263
Damien Miller5428f641999-11-25 11:54:57 +1100264/*
265 * Make packets from buffered stdin data, and buffer them for sending to the
266 * connection.
267 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000268
Ben Lindstrombba81212001-06-25 05:01:22 +0000269static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000270client_make_packets_from_stdin_data(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000271{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000272 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000273
Damien Miller95def091999-11-25 00:26:21 +1100274 /* Send buffered stdin data to the server. */
275 while (buffer_len(&stdin_buffer) > 0 &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100276 packet_not_very_much_data_to_write()) {
Damien Miller95def091999-11-25 00:26:21 +1100277 len = buffer_len(&stdin_buffer);
278 /* Keep the packets at reasonable size. */
279 if (len > packet_get_maxsize())
280 len = packet_get_maxsize();
281 packet_start(SSH_CMSG_STDIN_DATA);
282 packet_put_string(buffer_ptr(&stdin_buffer), len);
283 packet_send();
284 buffer_consume(&stdin_buffer, len);
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000285 stdin_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100286 /* If we have a pending EOF, send it now. */
287 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
288 packet_start(SSH_CMSG_EOF);
289 packet_send();
290 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000291 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000292}
293
Damien Miller5428f641999-11-25 11:54:57 +1100294/*
295 * Checks if the client window has changed, and sends a packet about it to
296 * the server if so. The actual change is detected elsewhere (by a software
297 * interrupt on Unix); this just checks the flag and sends a message if
298 * appropriate.
299 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000300
Ben Lindstrombba81212001-06-25 05:01:22 +0000301static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000302client_check_window_change(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000303{
Damien Miller1383bd82000-04-06 12:32:37 +1000304 struct winsize ws;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000305
Damien Miller1383bd82000-04-06 12:32:37 +1000306 if (! received_window_change_signal)
307 return;
308 /** XXX race */
309 received_window_change_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000310
Damien Millerd3444942000-09-30 14:20:03 +1100311 debug2("client_check_window_change: changed");
Damien Miller1383bd82000-04-06 12:32:37 +1000312
313 if (compat20) {
Damien Miller0e220db2004-06-15 10:34:08 +1000314 channel_send_window_changes();
Damien Miller1383bd82000-04-06 12:32:37 +1000315 } else {
Damien Miller0e220db2004-06-15 10:34:08 +1000316 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
317 return;
Damien Miller1383bd82000-04-06 12:32:37 +1000318 packet_start(SSH_CMSG_WINDOW_SIZE);
319 packet_put_int(ws.ws_row);
320 packet_put_int(ws.ws_col);
321 packet_put_int(ws.ws_xpixel);
322 packet_put_int(ws.ws_ypixel);
323 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000324 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000325}
326
Damien Miller509b0102003-12-17 16:33:10 +1100327static void
328client_global_request_reply(int type, u_int32_t seq, void *ctxt)
329{
330 server_alive_timeouts = 0;
331 client_global_request_reply_fwd(type, seq, ctxt);
332}
333
334static void
335server_alive_check(void)
336{
337 if (++server_alive_timeouts > options.server_alive_count_max)
338 packet_disconnect("Timeout, server not responding.");
339 packet_start(SSH2_MSG_GLOBAL_REQUEST);
340 packet_put_cstring("keepalive@openssh.com");
341 packet_put_char(1); /* boolean: want reply */
342 packet_send();
343}
344
Damien Miller5428f641999-11-25 11:54:57 +1100345/*
346 * Waits until the client can do something (some data becomes available on
347 * one of the file descriptors).
348 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000349static void
Damien Miller5e953212001-01-30 09:14:00 +1100350client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000351 int *maxfdp, u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000352{
Damien Miller509b0102003-12-17 16:33:10 +1100353 struct timeval tv, *tvp;
354 int ret;
355
Damien Miller5e953212001-01-30 09:14:00 +1100356 /* Add any selections by the channel mechanism. */
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000357 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000358
Damien Miller1383bd82000-04-06 12:32:37 +1000359 if (!compat20) {
360 /* Read from the connection, unless our buffers are full. */
361 if (buffer_len(&stdout_buffer) < buffer_high &&
362 buffer_len(&stderr_buffer) < buffer_high &&
363 channel_not_very_much_buffered_data())
Damien Miller5e953212001-01-30 09:14:00 +1100364 FD_SET(connection_in, *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000365 /*
366 * Read from stdin, unless we have seen EOF or have very much
367 * buffered data to send to the server.
368 */
369 if (!stdin_eof && packet_not_very_much_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100370 FD_SET(fileno(stdin), *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000371
372 /* Select stdout/stderr if have data in buffer. */
373 if (buffer_len(&stdout_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100374 FD_SET(fileno(stdout), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000375 if (buffer_len(&stderr_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100376 FD_SET(fileno(stderr), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000377 } else {
Ben Lindstromc8b3f472001-05-17 03:19:40 +0000378 /* channel_prepare_select could have closed the last channel */
Damien Miller164a7f42001-10-12 11:36:09 +1000379 if (session_closed && !channel_still_open() &&
380 !packet_have_data_to_write()) {
381 /* clear mask since we did not call select() */
Damien Miller79faeff2001-11-12 11:06:32 +1100382 memset(*readsetp, 0, *nallocp);
383 memset(*writesetp, 0, *nallocp);
Damien Miller164a7f42001-10-12 11:36:09 +1000384 return;
Ben Lindstromc8b3f472001-05-17 03:19:40 +0000385 } else {
386 FD_SET(connection_in, *readsetp);
387 }
Damien Miller1383bd82000-04-06 12:32:37 +1000388 }
389
Damien Miller95def091999-11-25 00:26:21 +1100390 /* Select server connection if have data to write to the server. */
391 if (packet_have_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100392 FD_SET(connection_out, *writesetp);
Damien Miller95def091999-11-25 00:26:21 +1100393
Damien Miller0e220db2004-06-15 10:34:08 +1000394 if (control_fd != -1)
395 FD_SET(control_fd, *readsetp);
396
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
Damien Miller509b0102003-12-17 16:33:10 +1100400 * event pending.
Damien Miller5428f641999-11-25 11:54:57 +1100401 */
Damien Miller95def091999-11-25 00:26:21 +1100402
Damien Miller509b0102003-12-17 16:33:10 +1100403 if (options.server_alive_interval == 0 || !compat20)
404 tvp = NULL;
Darren Tuckerfc959702004-07-17 16:12:08 +1000405 else {
Damien Miller509b0102003-12-17 16:33:10 +1100406 tv.tv_sec = options.server_alive_interval;
407 tv.tv_usec = 0;
408 tvp = &tv;
409 }
410 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
411 if (ret < 0) {
Damien Miller95def091999-11-25 00:26:21 +1100412 char buf[100];
Ben Lindstromf9452512001-02-15 03:12:08 +0000413
414 /*
415 * We have to clear the select masks, because we return.
416 * We have to return, because the mainloop checks for the flags
417 * set by the signal handlers.
418 */
Damien Miller79faeff2001-11-12 11:06:32 +1100419 memset(*readsetp, 0, *nallocp);
420 memset(*writesetp, 0, *nallocp);
Ben Lindstromf9452512001-02-15 03:12:08 +0000421
Damien Miller95def091999-11-25 00:26:21 +1100422 if (errno == EINTR)
423 return;
424 /* Note: we might still have data in the buffers. */
425 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
426 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100427 quit_pending = 1;
Damien Miller509b0102003-12-17 16:33:10 +1100428 } else if (ret == 0)
429 server_alive_check();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000430}
431
Ben Lindstrombba81212001-06-25 05:01:22 +0000432static void
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 /* Flush stdout and stderr buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000436 if (buffer_len(bout) > 0)
Darren Tucker9f63f222003-07-03 13:46:56 +1000437 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
Damien Millerad833b32000-08-23 10:46:23 +1000438 if (buffer_len(berr) > 0)
Darren Tucker9f63f222003-07-03 13:46:56 +1000439 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000440
Damien Miller95def091999-11-25 00:26:21 +1100441 leave_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000442
Damien Miller5428f641999-11-25 11:54:57 +1100443 /*
444 * Free (and clear) the buffer to reduce the amount of data that gets
445 * written to swap.
446 */
Damien Millerad833b32000-08-23 10:46:23 +1000447 buffer_free(bin);
448 buffer_free(bout);
449 buffer_free(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000450
Damien Miller95def091999-11-25 00:26:21 +1100451 /* Send the suspend signal to the program itself. */
452 kill(getpid(), SIGTSTP);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000453
Darren Tucker5d78de62004-11-05 20:35:44 +1100454 /* Reset window sizes in case they have changed */
455 received_window_change_signal = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000456
Damien Miller95def091999-11-25 00:26:21 +1100457 /* OK, we have been continued by the user. Reinitialize buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000458 buffer_init(bin);
459 buffer_init(bout);
460 buffer_init(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000461
Damien Miller95def091999-11-25 00:26:21 +1100462 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000463}
464
Ben Lindstrombba81212001-06-25 05:01:22 +0000465static void
Damien Miller1383bd82000-04-06 12:32:37 +1000466client_process_net_input(fd_set * readset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000467{
Damien Miller1383bd82000-04-06 12:32:37 +1000468 int len;
469 char buf[8192];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000470
Damien Miller5428f641999-11-25 11:54:57 +1100471 /*
472 * Read input from the server, and add any such data to the buffer of
473 * the packet subsystem.
474 */
Damien Miller95def091999-11-25 00:26:21 +1100475 if (FD_ISSET(connection_in, readset)) {
476 /* Read as much as possible. */
477 len = read(connection_in, buf, sizeof(buf));
478 if (len == 0) {
479 /* Received EOF. The remote host has closed the connection. */
480 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
481 host);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000482 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000483 quit_pending = 1;
484 return;
Damien Miller95def091999-11-25 00:26:21 +1100485 }
Damien Miller5428f641999-11-25 11:54:57 +1100486 /*
487 * There is a kernel bug on Solaris that causes select to
488 * sometimes wake up even though there is no data available.
489 */
Ben Lindstromebc88272001-03-06 03:34:40 +0000490 if (len < 0 && (errno == EAGAIN || errno == EINTR))
Damien Miller95def091999-11-25 00:26:21 +1100491 len = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000492
Damien Miller95def091999-11-25 00:26:21 +1100493 if (len < 0) {
494 /* An error has encountered. Perhaps there is a network problem. */
495 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
496 host, strerror(errno));
497 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100498 quit_pending = 1;
499 return;
500 }
501 packet_process_incoming(buf, len);
502 }
Damien Miller1383bd82000-04-06 12:32:37 +1000503}
504
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000505static void
Damien Miller0e220db2004-06-15 10:34:08 +1000506client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
507{
508 int id;
509 Channel *c;
Darren Tuckerfc959702004-07-17 16:12:08 +1000510
Damien Miller0e220db2004-06-15 10:34:08 +1000511 id = packet_get_int();
512 packet_check_eom();
513
514 if ((c = channel_lookup(id)) == NULL) {
515 error("%s: no channel for id %d", __func__, id);
516 return;
517 }
518
519 if (type == SSH2_MSG_CHANNEL_SUCCESS)
520 debug2("Request suceeded on channel %d", id);
521 else if (type == SSH2_MSG_CHANNEL_FAILURE) {
522 error("Request failed on channel %d", id);
523 channel_free(c);
524 }
525}
526
527static void
528client_extra_session2_setup(int id, void *arg)
529{
530 struct confirm_ctx *cctx = arg;
531 Channel *c;
Damien Miller3756dce2004-06-18 01:17:29 +1000532 int i;
Darren Tuckerfc959702004-07-17 16:12:08 +1000533
Damien Miller0e220db2004-06-15 10:34:08 +1000534 if (cctx == NULL)
535 fatal("%s: cctx == NULL", __func__);
536 if ((c = channel_lookup(id)) == NULL)
537 fatal("%s: no channel for id %d", __func__, id);
538
Darren Tuckerfc959702004-07-17 16:12:08 +1000539 client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
Damien Miller3756dce2004-06-18 01:17:29 +1000540 cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
Damien Miller0e220db2004-06-15 10:34:08 +1000541 client_subsystem_reply);
Damien Miller23f07702004-06-18 01:19:03 +1000542
Damien Miller0e220db2004-06-15 10:34:08 +1000543 c->confirm_ctx = NULL;
544 buffer_free(&cctx->cmd);
Damien Miller3756dce2004-06-18 01:17:29 +1000545 xfree(cctx->term);
546 if (cctx->env != NULL) {
547 for (i = 0; cctx->env[i] != NULL; i++)
548 xfree(cctx->env[i]);
549 xfree(cctx->env);
Darren Tuckerfc959702004-07-17 16:12:08 +1000550 }
Damien Miller3756dce2004-06-18 01:17:29 +1000551 xfree(cctx);
Damien Miller0e220db2004-06-15 10:34:08 +1000552}
553
554static void
555client_process_control(fd_set * readset)
556{
557 Buffer m;
558 Channel *c;
Damien Miller23f07702004-06-18 01:19:03 +1000559 int client_fd, new_fd[3], ver, i, allowed;
Damien Miller0e220db2004-06-15 10:34:08 +1000560 socklen_t addrlen;
561 struct sockaddr_storage addr;
562 struct confirm_ctx *cctx;
563 char *cmd;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100564 u_int len, env_len, command, flags;
Damien Miller0e220db2004-06-15 10:34:08 +1000565 uid_t euid;
566 gid_t egid;
567
568 /*
569 * Accept connection on control socket
570 */
571 if (control_fd == -1 || !FD_ISSET(control_fd, readset))
572 return;
573
574 memset(&addr, 0, sizeof(addr));
575 addrlen = sizeof(addr);
576 if ((client_fd = accept(control_fd,
577 (struct sockaddr*)&addr, &addrlen)) == -1) {
578 error("%s accept: %s", __func__, strerror(errno));
579 return;
580 }
581
582 if (getpeereid(client_fd, &euid, &egid) < 0) {
583 error("%s getpeereid failed: %s", __func__, strerror(errno));
584 close(client_fd);
585 return;
586 }
587 if ((euid != 0) && (getuid() != euid)) {
588 error("control mode uid mismatch: peer euid %u != uid %u",
589 (u_int) euid, (u_int) getuid());
590 close(client_fd);
591 return;
592 }
Damien Miller23f07702004-06-18 01:19:03 +1000593
Damien Miller0e220db2004-06-15 10:34:08 +1000594 unset_nonblock(client_fd);
595
Darren Tucker7ebfc102004-11-07 20:06:19 +1100596 /* Read command */
Damien Miller0e220db2004-06-15 10:34:08 +1000597 buffer_init(&m);
Darren Tucker7ebfc102004-11-07 20:06:19 +1100598 if (ssh_msg_recv(client_fd, &m) == -1) {
599 error("%s: client msg_recv failed", __func__);
600 close(client_fd);
601 buffer_free(&m);
602 return;
603 }
604 if ((ver = buffer_get_char(&m)) != 1) {
605 error("%s: wrong client version %d", __func__, ver);
606 buffer_free(&m);
607 close(client_fd);
608 return;
609 }
Damien Miller0e220db2004-06-15 10:34:08 +1000610
Darren Tucker7ebfc102004-11-07 20:06:19 +1100611 allowed = 1;
612 command = buffer_get_int(&m);
613 flags = buffer_get_int(&m);
614
615 buffer_clear(&m);
616
617 switch (command) {
618 case SSHMUX_COMMAND_OPEN:
619 if (options.control_master == 2)
620 allowed = ask_permission("Allow shared connection "
621 "to %s? ", host);
622 /* continue below */
623 break;
624 case SSHMUX_COMMAND_TERMINATE:
625 if (options.control_master == 2)
626 allowed = ask_permission("Terminate shared connection "
627 "to %s? ", host);
628 if (allowed)
629 quit_pending = 1;
Darren Tucker47eede72005-03-14 23:08:12 +1100630 /* FALLTHROUGH */
Darren Tucker7ebfc102004-11-07 20:06:19 +1100631 case SSHMUX_COMMAND_ALIVE_CHECK:
632 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
633 buffer_clear(&m);
634 buffer_put_int(&m, allowed);
635 buffer_put_int(&m, getpid());
636 if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
637 error("%s: client msg_send failed", __func__);
638 close(client_fd);
639 buffer_free(&m);
640 return;
641 }
642 buffer_free(&m);
643 close(client_fd);
644 return;
645 default:
646 error("Unsupported command %d", command);
647 buffer_free(&m);
648 close(client_fd);
649 return;
650 }
651
652 /* Reply for SSHMUX_COMMAND_OPEN */
653 buffer_clear(&m);
Damien Miller23f07702004-06-18 01:19:03 +1000654 buffer_put_int(&m, allowed);
Damien Miller0e220db2004-06-15 10:34:08 +1000655 buffer_put_int(&m, getpid());
Darren Tucker7ebfc102004-11-07 20:06:19 +1100656 if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
Damien Miller0e220db2004-06-15 10:34:08 +1000657 error("%s: client msg_send failed", __func__);
658 close(client_fd);
Damien Miller23f07702004-06-18 01:19:03 +1000659 buffer_free(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000660 return;
661 }
Damien Miller0e220db2004-06-15 10:34:08 +1000662
Damien Miller23f07702004-06-18 01:19:03 +1000663 if (!allowed) {
664 error("Refused control connection");
665 close(client_fd);
666 buffer_free(&m);
667 return;
668 }
669
Darren Tucker7ebfc102004-11-07 20:06:19 +1100670 buffer_clear(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000671 if (ssh_msg_recv(client_fd, &m) == -1) {
672 error("%s: client msg_recv failed", __func__);
673 close(client_fd);
Damien Miller23f07702004-06-18 01:19:03 +1000674 buffer_free(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000675 return;
676 }
Darren Tucker7ebfc102004-11-07 20:06:19 +1100677 if ((ver = buffer_get_char(&m)) != 1) {
Damien Miller0e220db2004-06-15 10:34:08 +1000678 error("%s: wrong client version %d", __func__, ver);
679 buffer_free(&m);
680 close(client_fd);
681 return;
682 }
683
684 cctx = xmalloc(sizeof(*cctx));
685 memset(cctx, 0, sizeof(*cctx));
Darren Tucker7ebfc102004-11-07 20:06:19 +1100686 cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
687 cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
Damien Miller0e220db2004-06-15 10:34:08 +1000688 cctx->term = buffer_get_string(&m, &len);
689
690 cmd = buffer_get_string(&m, &len);
691 buffer_init(&cctx->cmd);
692 buffer_append(&cctx->cmd, cmd, strlen(cmd));
693
Damien Miller3756dce2004-06-18 01:17:29 +1000694 env_len = buffer_get_int(&m);
695 env_len = MIN(env_len, 4096);
696 debug3("%s: receiving %d env vars", __func__, env_len);
697 if (env_len != 0) {
698 cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
699 for (i = 0; i < env_len; i++)
700 cctx->env[i] = buffer_get_string(&m, &len);
701 cctx->env[i] = NULL;
702 }
703
Damien Miller0e220db2004-06-15 10:34:08 +1000704 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
705 cctx->want_tty, cctx->want_subsys, cmd);
706
707 /* Gather fds from client */
708 new_fd[0] = mm_receive_fd(client_fd);
709 new_fd[1] = mm_receive_fd(client_fd);
710 new_fd[2] = mm_receive_fd(client_fd);
711
712 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
713 new_fd[0], new_fd[1], new_fd[2]);
714
715 /* Try to pick up ttymodes from client before it goes raw */
716 if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
717 error("%s: tcgetattr: %s", __func__, strerror(errno));
718
Darren Tucker7ebfc102004-11-07 20:06:19 +1100719 /* This roundtrip is just for synchronisation of ttymodes */
Damien Miller0e220db2004-06-15 10:34:08 +1000720 buffer_clear(&m);
Darren Tucker7ebfc102004-11-07 20:06:19 +1100721 if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
Damien Miller0e220db2004-06-15 10:34:08 +1000722 error("%s: client msg_send failed", __func__);
723 close(client_fd);
724 close(new_fd[0]);
725 close(new_fd[1]);
726 close(new_fd[2]);
Damien Miller23f07702004-06-18 01:19:03 +1000727 buffer_free(&m);
Darren Tucker7ebfc102004-11-07 20:06:19 +1100728 xfree(cctx->term);
729 if (env_len != 0) {
730 for (i = 0; i < env_len; i++)
731 xfree(cctx->env[i]);
732 xfree(cctx->env);
733 }
Damien Miller0e220db2004-06-15 10:34:08 +1000734 return;
735 }
736 buffer_free(&m);
737
738 /* enable nonblocking unless tty */
739 if (!isatty(new_fd[0]))
740 set_nonblock(new_fd[0]);
741 if (!isatty(new_fd[1]))
742 set_nonblock(new_fd[1]);
743 if (!isatty(new_fd[2]))
744 set_nonblock(new_fd[2]);
745
746 set_nonblock(client_fd);
747
Darren Tuckerfc959702004-07-17 16:12:08 +1000748 c = channel_new("session", SSH_CHANNEL_OPENING,
Damien Miller0e220db2004-06-15 10:34:08 +1000749 new_fd[0], new_fd[1], new_fd[2],
750 CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
751 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
752
753 /* XXX */
754 c->ctl_fd = client_fd;
755
756 debug3("%s: channel_new: %d", __func__, c->self);
757
758 channel_send_open(c->self);
759 channel_register_confirm(c->self, client_extra_session2_setup, cctx);
760}
761
762static void
Ben Lindstrom681d9322002-03-22 03:53:00 +0000763process_cmdline(void)
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000764{
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000765 void (*handler)(int);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100766 char *s, *cmd, *cancel_host;
Darren Tuckere7066df2004-05-24 10:18:05 +1000767 int delete = 0;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000768 int local = 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100769 u_short cancel_port;
770 Forward fwd;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000771
772 leave_raw_mode();
Ben Lindstrom5a6abda2002-06-09 19:41:48 +0000773 handler = signal(SIGINT, SIG_IGN);
Ben Lindstrom681d9322002-03-22 03:53:00 +0000774 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000775 if (s == NULL)
776 goto out;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000777 while (*s && isspace(*s))
778 s++;
Darren Tuckere7066df2004-05-24 10:18:05 +1000779 if (*s == '-')
780 s++; /* Skip cmdline '-', if any */
Darren Tuckere1675822004-05-24 10:13:07 +1000781 if (*s == '\0')
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000782 goto out;
Darren Tuckere7066df2004-05-24 10:18:05 +1000783
Darren Tucker1973c882004-05-24 10:34:36 +1000784 if (*s == 'h' || *s == 'H' || *s == '?') {
Darren Tuckere7066df2004-05-24 10:18:05 +1000785 logit("Commands:");
786 logit(" -Lport:host:hostport Request local forward");
787 logit(" -Rport:host:hostport Request remote forward");
788 logit(" -KRhostport Cancel remote forward");
789 goto out;
790 }
791
792 if (*s == 'K') {
793 delete = 1;
794 s++;
795 }
796 if (*s != 'L' && *s != 'R') {
Damien Miller996acd22003-04-09 20:59:48 +1000797 logit("Invalid command.");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000798 goto out;
799 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000800 if (*s == 'L')
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000801 local = 1;
Darren Tuckere7066df2004-05-24 10:18:05 +1000802 if (local && delete) {
803 logit("Not supported.");
804 goto out;
805 }
806 if ((!local || delete) && !compat20) {
Damien Miller996acd22003-04-09 20:59:48 +1000807 logit("Not supported for SSH protocol version 1.");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000808 goto out;
809 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000810
811 s++;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000812 while (*s && isspace(*s))
813 s++;
814
Darren Tuckere7066df2004-05-24 10:18:05 +1000815 if (delete) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100816 cancel_port = 0;
817 cancel_host = hpdelim(&s); /* may be NULL */
818 if (s != NULL) {
819 cancel_port = a2port(s);
820 cancel_host = cleanhostname(cancel_host);
821 } else {
822 cancel_port = a2port(cancel_host);
823 cancel_host = NULL;
824 }
825 if (cancel_port == 0) {
826 logit("Bad forwarding close port");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000827 goto out;
828 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100829 channel_request_rforward_cancel(cancel_host, cancel_port);
Darren Tuckere7066df2004-05-24 10:18:05 +1000830 } else {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100831 if (!parse_forward(&fwd, s)) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000832 logit("Bad forwarding specification.");
833 goto out;
834 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000835 if (local) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100836 if (channel_setup_local_fwd_listener(fwd.listen_host,
837 fwd.listen_port, fwd.connect_host,
838 fwd.connect_port, options.gateway_ports) < 0) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000839 logit("Port forwarding failed.");
840 goto out;
841 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100842 } else {
843 channel_request_remote_forwarding(fwd.listen_host,
844 fwd.listen_port, fwd.connect_host,
845 fwd.connect_port);
846 }
847
Darren Tuckere7066df2004-05-24 10:18:05 +1000848 logit("Forwarding port.");
849 }
850
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000851out:
852 signal(SIGINT, handler);
853 enter_raw_mode();
854 if (cmd)
855 xfree(cmd);
856}
857
Damien Millerad833b32000-08-23 10:46:23 +1000858/* process the characters one by one */
Ben Lindstrombba81212001-06-25 05:01:22 +0000859static int
Damien Millerad833b32000-08-23 10:46:23 +1000860process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
861{
862 char string[1024];
863 pid_t pid;
864 int bytes = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000865 u_int i;
866 u_char ch;
Damien Millerad833b32000-08-23 10:46:23 +1000867 char *s;
868
869 for (i = 0; i < len; i++) {
870 /* Get one character at a time. */
871 ch = buf[i];
872
873 if (escape_pending) {
874 /* We have previously seen an escape character. */
875 /* Clear the flag now. */
876 escape_pending = 0;
877
878 /* Process the escaped character. */
879 switch (ch) {
880 case '.':
881 /* Terminate the connection. */
882 snprintf(string, sizeof string, "%c.\r\n", escape_char);
883 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +1000884
885 quit_pending = 1;
886 return -1;
887
888 case 'Z' - 64:
889 /* Suspend the program. */
890 /* Print a message to that effect to the user. */
891 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
892 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +1000893
894 /* Restore terminal modes and suspend. */
895 client_suspend_self(bin, bout, berr);
896
897 /* We have been continued. */
898 continue;
899
Damien Miller54c45982003-05-15 10:20:13 +1000900 case 'B':
901 if (compat20) {
902 snprintf(string, sizeof string,
903 "%cB\r\n", escape_char);
904 buffer_append(berr, string,
905 strlen(string));
906 channel_request_start(session_ident,
907 "break", 0);
908 packet_put_int(1000);
909 packet_send();
910 }
911 continue;
912
Ben Lindstromf28f6342001-04-04 02:03:04 +0000913 case 'R':
Ben Lindstrom11bd8992001-04-05 23:34:29 +0000914 if (compat20) {
915 if (datafellows & SSH_BUG_NOREKEY)
Damien Miller996acd22003-04-09 20:59:48 +1000916 logit("Server does not support re-keying");
Ben Lindstrom11bd8992001-04-05 23:34:29 +0000917 else
918 need_rekeying = 1;
919 }
Ben Lindstromf28f6342001-04-04 02:03:04 +0000920 continue;
921
Damien Millerad833b32000-08-23 10:46:23 +1000922 case '&':
Damien Millerad833b32000-08-23 10:46:23 +1000923 /*
924 * Detach the program (continue to serve connections,
925 * but put in background and no more new connections).
926 */
Damien Miller96507ef2001-11-12 10:52:25 +1100927 /* Restore tty modes. */
928 leave_raw_mode();
929
930 /* Stop listening for new connections. */
931 channel_stop_listening();
932
933 snprintf(string, sizeof string,
934 "%c& [backgrounded]\n", escape_char);
935 buffer_append(berr, string, strlen(string));
936
937 /* Fork into background. */
938 pid = fork();
939 if (pid < 0) {
940 error("fork: %.100s", strerror(errno));
941 continue;
942 }
943 if (pid != 0) { /* This is the parent. */
944 /* The parent just exits. */
945 exit(0);
946 }
947 /* The child continues serving connections. */
948 if (compat20) {
949 buffer_append(bin, "\004", 1);
950 /* fake EOF on stdin */
951 return -1;
952 } else if (!stdin_eof) {
Damien Millerad833b32000-08-23 10:46:23 +1000953 /*
954 * Sending SSH_CMSG_EOF alone does not always appear
955 * to be enough. So we try to send an EOF character
956 * first.
957 */
958 packet_start(SSH_CMSG_STDIN_DATA);
959 packet_put_string("\004", 1);
960 packet_send();
961 /* Close stdin. */
962 stdin_eof = 1;
963 if (buffer_len(bin) == 0) {
964 packet_start(SSH_CMSG_EOF);
965 packet_send();
966 }
967 }
Damien Miller96507ef2001-11-12 10:52:25 +1100968 continue;
Damien Millerad833b32000-08-23 10:46:23 +1000969
970 case '?':
971 snprintf(string, sizeof string,
972"%c?\r\n\
973Supported escape sequences:\r\n\
Damien Miller06692862002-09-04 16:32:10 +1000974%c. - terminate connection\r\n\
Damien Miller54c45982003-05-15 10:20:13 +1000975%cB - send a BREAK to the remote system\r\n\
Damien Miller06692862002-09-04 16:32:10 +1000976%cC - open a command line\r\n\
977%cR - Request rekey (SSH protocol 2 only)\r\n\
978%c^Z - suspend ssh\r\n\
979%c# - list forwarded connections\r\n\
980%c& - background ssh (when waiting for connections to terminate)\r\n\
981%c? - this message\r\n\
982%c%c - send the escape character by typing it twice\r\n\
Damien Millerad833b32000-08-23 10:46:23 +1000983(Note that escapes are only recognized immediately after newline.)\r\n",
Damien Miller06692862002-09-04 16:32:10 +1000984 escape_char, escape_char, escape_char, escape_char,
985 escape_char, escape_char, escape_char, escape_char,
Damien Miller54c45982003-05-15 10:20:13 +1000986 escape_char, escape_char, escape_char);
Damien Millerad833b32000-08-23 10:46:23 +1000987 buffer_append(berr, string, strlen(string));
988 continue;
989
990 case '#':
991 snprintf(string, sizeof string, "%c#\r\n", escape_char);
992 buffer_append(berr, string, strlen(string));
993 s = channel_open_message();
994 buffer_append(berr, s, strlen(s));
995 xfree(s);
996 continue;
997
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000998 case 'C':
Ben Lindstrom681d9322002-03-22 03:53:00 +0000999 process_cmdline();
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001000 continue;
1001
Damien Millerad833b32000-08-23 10:46:23 +10001002 default:
1003 if (ch != escape_char) {
1004 buffer_put_char(bin, escape_char);
1005 bytes++;
1006 }
1007 /* Escaped characters fall through here */
1008 break;
1009 }
1010 } else {
1011 /*
1012 * The previous character was not an escape char. Check if this
1013 * is an escape.
1014 */
1015 if (last_was_cr && ch == escape_char) {
1016 /* It is. Set the flag and continue to next character. */
1017 escape_pending = 1;
1018 continue;
1019 }
1020 }
1021
1022 /*
1023 * Normal character. Record whether it was a newline,
1024 * and append it to the buffer.
1025 */
1026 last_was_cr = (ch == '\r' || ch == '\n');
1027 buffer_put_char(bin, ch);
1028 bytes++;
1029 }
1030 return bytes;
1031}
1032
Ben Lindstrombba81212001-06-25 05:01:22 +00001033static void
Damien Miller1383bd82000-04-06 12:32:37 +10001034client_process_input(fd_set * readset)
1035{
Damien Miller166fca82000-04-20 07:42:21 +10001036 int len;
Damien Millerad833b32000-08-23 10:46:23 +10001037 char buf[8192];
Damien Miller1383bd82000-04-06 12:32:37 +10001038
Damien Miller95def091999-11-25 00:26:21 +11001039 /* Read input from stdin. */
1040 if (FD_ISSET(fileno(stdin), readset)) {
1041 /* Read as much as possible. */
1042 len = read(fileno(stdin), buf, sizeof(buf));
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001043 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1044 return; /* we'll try again later */
Damien Miller95def091999-11-25 00:26:21 +11001045 if (len <= 0) {
Damien Miller5428f641999-11-25 11:54:57 +11001046 /*
1047 * Received EOF or error. They are treated
1048 * similarly, except that an error message is printed
1049 * if it was an error condition.
1050 */
Damien Miller95def091999-11-25 00:26:21 +11001051 if (len < 0) {
1052 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1053 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001054 }
1055 /* Mark that we have seen EOF. */
1056 stdin_eof = 1;
Damien Miller5428f641999-11-25 11:54:57 +11001057 /*
1058 * Send an EOF message to the server unless there is
1059 * data in the buffer. If there is data in the
1060 * buffer, no message will be sent now. Code
1061 * elsewhere will send the EOF when the buffer
1062 * becomes empty if stdin_eof is set.
1063 */
Damien Miller95def091999-11-25 00:26:21 +11001064 if (buffer_len(&stdin_buffer) == 0) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001065 packet_start(SSH_CMSG_EOF);
1066 packet_send();
Damien Miller95def091999-11-25 00:26:21 +11001067 }
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001068 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
Damien Miller5428f641999-11-25 11:54:57 +11001069 /*
1070 * Normal successful read, and no escape character.
1071 * Just append the data to buffer.
1072 */
Damien Miller95def091999-11-25 00:26:21 +11001073 buffer_append(&stdin_buffer, buf, len);
Damien Miller95def091999-11-25 00:26:21 +11001074 } else {
Damien Miller5428f641999-11-25 11:54:57 +11001075 /*
1076 * Normal, successful read. But we have an escape character
1077 * and have to process the characters one by one.
1078 */
Ben Lindstrome9613cf2001-03-05 06:14:02 +00001079 if (process_escapes(&stdin_buffer, &stdout_buffer,
1080 &stderr_buffer, buf, len) == -1)
Damien Millerad833b32000-08-23 10:46:23 +10001081 return;
Damien Miller95def091999-11-25 00:26:21 +11001082 }
1083 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001084}
1085
Ben Lindstrombba81212001-06-25 05:01:22 +00001086static void
Damien Miller95def091999-11-25 00:26:21 +11001087client_process_output(fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001088{
Damien Miller95def091999-11-25 00:26:21 +11001089 int len;
1090 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001091
Damien Miller95def091999-11-25 00:26:21 +11001092 /* Write buffered output to stdout. */
1093 if (FD_ISSET(fileno(stdout), writeset)) {
1094 /* Write as much data as possible. */
1095 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001096 buffer_len(&stdout_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001097 if (len <= 0) {
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001098 if (errno == EINTR || errno == EAGAIN)
Damien Miller95def091999-11-25 00:26:21 +11001099 len = 0;
1100 else {
Damien Miller5428f641999-11-25 11:54:57 +11001101 /*
1102 * An error or EOF was encountered. Put an
1103 * error message to stderr buffer.
1104 */
Damien Miller95def091999-11-25 00:26:21 +11001105 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1106 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001107 quit_pending = 1;
1108 return;
1109 }
1110 }
1111 /* Consume printed data from the buffer. */
1112 buffer_consume(&stdout_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001113 stdout_bytes += len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001114 }
Damien Miller95def091999-11-25 00:26:21 +11001115 /* Write buffered output to stderr. */
1116 if (FD_ISSET(fileno(stderr), writeset)) {
1117 /* Write as much data as possible. */
1118 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001119 buffer_len(&stderr_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001120 if (len <= 0) {
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001121 if (errno == EINTR || errno == EAGAIN)
Damien Miller95def091999-11-25 00:26:21 +11001122 len = 0;
1123 else {
Damien Miller5428f641999-11-25 11:54:57 +11001124 /* EOF or error, but can't even print error message. */
Damien Miller95def091999-11-25 00:26:21 +11001125 quit_pending = 1;
1126 return;
1127 }
1128 }
1129 /* Consume printed characters from the buffer. */
1130 buffer_consume(&stderr_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001131 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001132 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001133}
1134
Damien Miller5428f641999-11-25 11:54:57 +11001135/*
Damien Millerb38eff82000-04-01 11:09:21 +10001136 * Get packets from the connection input buffer, and process them as long as
1137 * there are packets available.
1138 *
1139 * Any unknown packets received during the actual
1140 * session cause the session to terminate. This is
1141 * intended to make debugging easier since no
1142 * confirmations are sent. Any compatible protocol
1143 * extensions must be negotiated during the
1144 * preparatory phase.
1145 */
1146
Ben Lindstrombba81212001-06-25 05:01:22 +00001147static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001148client_process_buffered_input_packets(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001149{
Ben Lindstromf28f6342001-04-04 02:03:04 +00001150 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
Damien Millerb38eff82000-04-01 11:09:21 +10001151}
1152
Damien Millerad833b32000-08-23 10:46:23 +10001153/* scan buf[] for '~' before sending data to the peer */
1154
Ben Lindstrombba81212001-06-25 05:01:22 +00001155static int
Damien Millerad833b32000-08-23 10:46:23 +10001156simple_escape_filter(Channel *c, char *buf, int len)
1157{
1158 /* XXX we assume c->extended is writeable */
1159 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1160}
1161
Ben Lindstrombba81212001-06-25 05:01:22 +00001162static void
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001163client_channel_closed(int id, void *arg)
1164{
Damien Miller3ec27592001-10-12 11:35:04 +10001165 channel_cancel_cleanup(id);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001166 session_closed = 1;
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001167 leave_raw_mode();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001168}
1169
Damien Millerb38eff82000-04-01 11:09:21 +10001170/*
Damien Miller5428f641999-11-25 11:54:57 +11001171 * Implements the interactive session with the server. This is called after
1172 * the user has been authenticated, and a command has been started on the
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001173 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1174 * used as an escape character for terminating or suspending the session.
Damien Miller5428f641999-11-25 11:54:57 +11001175 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001176
Damien Miller4af51302000-04-16 11:18:38 +10001177int
Damien Millerad833b32000-08-23 10:46:23 +10001178client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001179{
Damien Miller5e953212001-01-30 09:14:00 +11001180 fd_set *readset = NULL, *writeset = NULL;
Damien Miller95def091999-11-25 00:26:21 +11001181 double start_time, total_time;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001182 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1183 u_int nalloc = 0;
Damien Miller95def091999-11-25 00:26:21 +11001184 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001185
Damien Miller95def091999-11-25 00:26:21 +11001186 debug("Entering interactive session.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001187
Damien Miller95def091999-11-25 00:26:21 +11001188 start_time = get_current_time();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001189
Damien Miller95def091999-11-25 00:26:21 +11001190 /* Initialize variables. */
1191 escape_pending = 0;
1192 last_was_cr = 1;
1193 exit_status = -1;
1194 stdin_eof = 0;
1195 buffer_high = 64 * 1024;
1196 connection_in = packet_get_connection_in();
1197 connection_out = packet_get_connection_out();
Damien Miller5e953212001-01-30 09:14:00 +11001198 max_fd = MAX(connection_in, connection_out);
Damien Miller0e220db2004-06-15 10:34:08 +10001199 if (control_fd != -1)
1200 max_fd = MAX(max_fd, control_fd);
Damien Miller5e953212001-01-30 09:14:00 +11001201
1202 if (!compat20) {
Ben Lindstrom302ea6f2001-04-16 02:01:25 +00001203 /* enable nonblocking unless tty */
1204 if (!isatty(fileno(stdin)))
1205 set_nonblock(fileno(stdin));
1206 if (!isatty(fileno(stdout)))
1207 set_nonblock(fileno(stdout));
1208 if (!isatty(fileno(stderr)))
1209 set_nonblock(fileno(stderr));
Damien Miller5e953212001-01-30 09:14:00 +11001210 max_fd = MAX(max_fd, fileno(stdin));
1211 max_fd = MAX(max_fd, fileno(stdout));
1212 max_fd = MAX(max_fd, fileno(stderr));
1213 }
Damien Miller95def091999-11-25 00:26:21 +11001214 stdin_bytes = 0;
1215 stdout_bytes = 0;
1216 stderr_bytes = 0;
1217 quit_pending = 0;
1218 escape_char = escape_char_arg;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001219
Damien Miller95def091999-11-25 00:26:21 +11001220 /* Initialize buffers. */
1221 buffer_init(&stdin_buffer);
1222 buffer_init(&stdout_buffer);
1223 buffer_init(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001224
Damien Millerb38eff82000-04-01 11:09:21 +10001225 client_init_dispatch();
1226
Ben Lindstromf49dbff2002-12-23 02:01:55 +00001227 /*
1228 * Set signal handlers, (e.g. to restore non-blocking mode)
1229 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1230 */
Darren Tucker07336da2004-11-05 20:02:16 +11001231 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1232 signal(SIGHUP, signal_handler);
Ben Lindstromf49dbff2002-12-23 02:01:55 +00001233 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1234 signal(SIGINT, signal_handler);
1235 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1236 signal(SIGQUIT, signal_handler);
1237 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1238 signal(SIGTERM, signal_handler);
Darren Tucker5d78de62004-11-05 20:35:44 +11001239 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001240
Damien Miller95def091999-11-25 00:26:21 +11001241 if (have_pty)
1242 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001243
Ben Lindstrom5b828322001-02-09 01:34:36 +00001244 if (compat20) {
1245 session_ident = ssh2_chan_id;
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001246 if (escape_char != SSH_ESCAPECHAR_NONE)
Ben Lindstrom5b828322001-02-09 01:34:36 +00001247 channel_register_filter(session_ident,
1248 simple_escape_filter);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001249 if (session_ident != -1)
1250 channel_register_cleanup(session_ident,
1251 client_channel_closed);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001252 } else {
1253 /* Check if we should immediately send eof on stdin. */
Damien Miller1383bd82000-04-06 12:32:37 +10001254 client_check_initial_eof_on_stdin();
Ben Lindstrom5b828322001-02-09 01:34:36 +00001255 }
Damien Millerad833b32000-08-23 10:46:23 +10001256
Damien Miller95def091999-11-25 00:26:21 +11001257 /* Main loop of the client for the interactive session mode. */
1258 while (!quit_pending) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001259
Damien Miller5428f641999-11-25 11:54:57 +11001260 /* Process buffered packets sent by the server. */
Damien Miller95def091999-11-25 00:26:21 +11001261 client_process_buffered_input_packets();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001262
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001263 if (compat20 && session_closed && !channel_still_open())
Damien Miller1383bd82000-04-06 12:32:37 +10001264 break;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001265
1266 rekeying = (xxx_kex != NULL && !xxx_kex->done);
Damien Miller1383bd82000-04-06 12:32:37 +10001267
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001268 if (rekeying) {
1269 debug("rekeying in progress");
1270 } else {
1271 /*
1272 * Make packets of buffered stdin data, and buffer
1273 * them for sending to the server.
1274 */
1275 if (!compat20)
1276 client_make_packets_from_stdin_data();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001277
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001278 /*
1279 * Make packets from buffered channel data, and
1280 * enqueue them for sending to the server.
1281 */
1282 if (packet_not_very_much_data_to_write())
1283 channel_output_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001284
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001285 /*
1286 * Check if the window size has changed, and buffer a
1287 * message about it to the server if so.
1288 */
1289 client_check_window_change();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001290
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001291 if (quit_pending)
1292 break;
1293 }
Damien Miller5428f641999-11-25 11:54:57 +11001294 /*
1295 * Wait until we have something to do (something becomes
1296 * available on one of the descriptors).
1297 */
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001298 max_fd2 = max_fd;
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001299 client_wait_until_can_do_something(&readset, &writeset,
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001300 &max_fd2, &nalloc, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001301
Damien Miller95def091999-11-25 00:26:21 +11001302 if (quit_pending)
1303 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001304
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001305 /* Do channel operations unless rekeying in progress. */
1306 if (!rekeying) {
1307 channel_after_select(readset, writeset);
Damien Millera5539d22003-04-09 20:50:06 +10001308 if (need_rekeying || packet_need_rekeying()) {
1309 debug("need rekeying");
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001310 xxx_kex->done = 0;
1311 kex_send_kexinit(xxx_kex);
1312 need_rekeying = 0;
1313 }
1314 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001315
Damien Miller1383bd82000-04-06 12:32:37 +10001316 /* Buffer input from the connection. */
Damien Miller5e953212001-01-30 09:14:00 +11001317 client_process_net_input(readset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001318
Damien Miller0e220db2004-06-15 10:34:08 +10001319 /* Accept control connections. */
1320 client_process_control(readset);
1321
Damien Miller1383bd82000-04-06 12:32:37 +10001322 if (quit_pending)
1323 break;
1324
1325 if (!compat20) {
1326 /* Buffer data from stdin */
Damien Miller5e953212001-01-30 09:14:00 +11001327 client_process_input(readset);
Damien Miller1383bd82000-04-06 12:32:37 +10001328 /*
1329 * Process output to stdout and stderr. Output to
1330 * the connection is processed elsewhere (above).
1331 */
Damien Miller5e953212001-01-30 09:14:00 +11001332 client_process_output(writeset);
Damien Miller1383bd82000-04-06 12:32:37 +10001333 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001334
Damien Miller5428f641999-11-25 11:54:57 +11001335 /* Send as much buffered packet data as possible to the sender. */
Damien Miller5e953212001-01-30 09:14:00 +11001336 if (FD_ISSET(connection_out, writeset))
Damien Miller95def091999-11-25 00:26:21 +11001337 packet_write_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001338 }
Damien Miller5e953212001-01-30 09:14:00 +11001339 if (readset)
1340 xfree(readset);
1341 if (writeset)
1342 xfree(writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001343
Damien Miller95def091999-11-25 00:26:21 +11001344 /* Terminate the session. */
1345
1346 /* Stop watching for window change. */
Darren Tucker5d78de62004-11-05 20:35:44 +11001347 signal(SIGWINCH, SIG_DFL);
Damien Miller95def091999-11-25 00:26:21 +11001348
Ben Lindstrom601e4362001-06-21 03:19:23 +00001349 channel_free_all();
Damien Miller95def091999-11-25 00:26:21 +11001350
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001351 if (have_pty)
1352 leave_raw_mode();
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001353
1354 /* restore blocking io */
1355 if (!isatty(fileno(stdin)))
1356 unset_nonblock(fileno(stdin));
1357 if (!isatty(fileno(stdout)))
1358 unset_nonblock(fileno(stdout));
1359 if (!isatty(fileno(stderr)))
1360 unset_nonblock(fileno(stderr));
1361
Damien Millerd6965512003-12-17 16:31:53 +11001362 /*
1363 * If there was no shell or command requested, there will be no remote
1364 * exit status to be returned. In that case, clear error code if the
1365 * connection was deliberately terminated at this end.
1366 */
1367 if (no_shell_flag && received_signal == SIGTERM) {
1368 received_signal = 0;
1369 exit_status = 0;
1370 }
1371
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001372 if (received_signal)
Ben Lindstromf8f065b2001-12-06 17:52:16 +00001373 fatal("Killed by signal %d.", (int) received_signal);
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001374
1375 /*
1376 * In interactive mode (with pseudo tty) display a message indicating
1377 * that the connection has been closed.
1378 */
1379 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1380 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1381 buffer_append(&stderr_buffer, buf, strlen(buf));
1382 }
1383
Damien Miller95def091999-11-25 00:26:21 +11001384 /* Output any buffered data for stdout. */
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001385 while (buffer_len(&stdout_buffer) > 0) {
1386 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001387 buffer_len(&stdout_buffer));
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001388 if (len <= 0) {
Damien Miller95def091999-11-25 00:26:21 +11001389 error("Write failed flushing stdout buffer.");
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001390 break;
1391 }
Damien Miller95def091999-11-25 00:26:21 +11001392 buffer_consume(&stdout_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001393 stdout_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001394 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001395
Damien Miller95def091999-11-25 00:26:21 +11001396 /* Output any buffered data for stderr. */
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001397 while (buffer_len(&stderr_buffer) > 0) {
1398 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001399 buffer_len(&stderr_buffer));
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001400 if (len <= 0) {
Damien Miller95def091999-11-25 00:26:21 +11001401 error("Write failed flushing stderr buffer.");
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001402 break;
1403 }
Damien Miller95def091999-11-25 00:26:21 +11001404 buffer_consume(&stderr_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001405 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001406 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001407
Damien Miller95def091999-11-25 00:26:21 +11001408 /* Clear and free any buffers. */
1409 memset(buf, 0, sizeof(buf));
1410 buffer_free(&stdin_buffer);
1411 buffer_free(&stdout_buffer);
1412 buffer_free(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001413
Damien Miller95def091999-11-25 00:26:21 +11001414 /* Report bytes transferred, and transfer rates. */
1415 total_time = get_current_time() - start_time;
1416 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001417 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
Damien Miller95def091999-11-25 00:26:21 +11001418 if (total_time > 0)
1419 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001420 stdin_bytes / total_time, stdout_bytes / total_time,
1421 stderr_bytes / total_time);
Damien Miller95def091999-11-25 00:26:21 +11001422
1423 /* Return the exit status of the program. */
1424 debug("Exit status %d", exit_status);
1425 return exit_status;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001426}
Damien Millerb38eff82000-04-01 11:09:21 +10001427
1428/*********/
1429
Ben Lindstrombba81212001-06-25 05:01:22 +00001430static void
Damien Miller630d6f42002-01-22 23:17:30 +11001431client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001432{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001433 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001434 char *data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001435 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001436 buffer_append(&stdout_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001437 memset(data, 0, data_len);
1438 xfree(data);
1439}
Ben Lindstrombba81212001-06-25 05:01:22 +00001440static void
Damien Miller630d6f42002-01-22 23:17:30 +11001441client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001442{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001443 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001444 char *data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001445 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001446 buffer_append(&stderr_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001447 memset(data, 0, data_len);
1448 xfree(data);
1449}
Ben Lindstrombba81212001-06-25 05:01:22 +00001450static void
Damien Miller630d6f42002-01-22 23:17:30 +11001451client_input_exit_status(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001452{
Damien Millerb38eff82000-04-01 11:09:21 +10001453 exit_status = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001454 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001455 /* Acknowledge the exit. */
1456 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1457 packet_send();
1458 /*
1459 * Must wait for packet to be sent since we are
1460 * exiting the loop.
1461 */
1462 packet_write_wait();
1463 /* Flag that we want to exit. */
1464 quit_pending = 1;
1465}
Darren Tucker5dcdd212003-10-02 16:17:00 +10001466static void
1467client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1468{
1469 Channel *c = NULL;
1470 int remote_id, sock;
1471
1472 /* Read the remote channel number from the message. */
1473 remote_id = packet_get_int();
1474 packet_check_eom();
1475
1476 /*
1477 * Get a connection to the local authentication agent (this may again
1478 * get forwarded).
1479 */
1480 sock = ssh_get_authentication_socket();
1481
1482 /*
1483 * If we could not connect the agent, send an error message back to
1484 * the server. This should never happen unless the agent dies,
1485 * because authentication forwarding is only enabled if we have an
1486 * agent.
1487 */
1488 if (sock >= 0) {
1489 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1490 -1, 0, 0, 0, "authentication agent connection", 1);
1491 c->remote_id = remote_id;
1492 c->force_drain = 1;
1493 }
1494 if (c == NULL) {
1495 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1496 packet_put_int(remote_id);
1497 } else {
1498 /* Send a confirmation to the remote host. */
1499 debug("Forwarding authentication connection.");
1500 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1501 packet_put_int(remote_id);
1502 packet_put_int(c->self);
1503 }
1504 packet_send();
1505}
Damien Millerb38eff82000-04-01 11:09:21 +10001506
Ben Lindstrombba81212001-06-25 05:01:22 +00001507static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001508client_request_forwarded_tcpip(const char *request_type, int rchan)
1509{
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001510 Channel *c = NULL;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001511 char *listen_address, *originator_address;
1512 int listen_port, originator_port;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001513 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001514
1515 /* Get rest of the packet */
1516 listen_address = packet_get_string(NULL);
1517 listen_port = packet_get_int();
1518 originator_address = packet_get_string(NULL);
1519 originator_port = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001520 packet_check_eom();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001521
1522 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1523 listen_address, listen_port, originator_address, originator_port);
1524
Ben Lindstrom173e6462001-07-04 05:15:15 +00001525 sock = channel_connect_by_listen_address(listen_port);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001526 if (sock < 0) {
1527 xfree(originator_address);
1528 xfree(listen_address);
1529 return NULL;
1530 }
1531 c = channel_new("forwarded-tcpip",
1532 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1533 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001534 originator_address, 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001535 xfree(originator_address);
1536 xfree(listen_address);
1537 return c;
1538}
1539
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001540static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001541client_request_x11(const char *request_type, int rchan)
1542{
1543 Channel *c = NULL;
1544 char *originator;
1545 int originator_port;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001546 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001547
1548 if (!options.forward_x11) {
1549 error("Warning: ssh server tried X11 forwarding.");
1550 error("Warning: this is probably a break in attempt by a malicious server.");
1551 return NULL;
1552 }
1553 originator = packet_get_string(NULL);
1554 if (datafellows & SSH_BUG_X11FWD) {
1555 debug2("buggy server: x11 request w/o originator_port");
1556 originator_port = 0;
1557 } else {
1558 originator_port = packet_get_int();
1559 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001560 packet_check_eom();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001561 /* XXX check permission */
Damien Millerd83ff352001-01-30 09:19:34 +11001562 debug("client_request_x11: request from %s %d", originator,
1563 originator_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001564 xfree(originator);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001565 sock = x11_connect_display();
1566 if (sock < 0)
1567 return NULL;
1568 c = channel_new("x11",
1569 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001570 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001571 c->force_drain = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001572 return c;
1573}
1574
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001575static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001576client_request_agent(const char *request_type, int rchan)
1577{
1578 Channel *c = NULL;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001579 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001580
1581 if (!options.forward_agent) {
1582 error("Warning: ssh server tried agent forwarding.");
1583 error("Warning: this is probably a break in attempt by a malicious server.");
1584 return NULL;
1585 }
1586 sock = ssh_get_authentication_socket();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001587 if (sock < 0)
1588 return NULL;
1589 c = channel_new("authentication agent connection",
1590 SSH_CHANNEL_OPEN, sock, sock, -1,
1591 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001592 "authentication agent connection", 1);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001593 c->force_drain = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001594 return c;
1595}
1596
Damien Millerbd483e72000-04-30 10:00:53 +10001597/* XXXX move to generic input handler */
Ben Lindstrombba81212001-06-25 05:01:22 +00001598static void
Damien Miller630d6f42002-01-22 23:17:30 +11001599client_input_channel_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10001600{
1601 Channel *c = NULL;
1602 char *ctype;
Damien Millerbd483e72000-04-30 10:00:53 +10001603 int rchan;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001604 u_int rmaxpack, rwindow, len;
Damien Millerbd483e72000-04-30 10:00:53 +10001605
1606 ctype = packet_get_string(&len);
1607 rchan = packet_get_int();
1608 rwindow = packet_get_int();
1609 rmaxpack = packet_get_int();
1610
Damien Millere247cc42000-05-07 12:03:14 +10001611 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
Damien Millerbd483e72000-04-30 10:00:53 +10001612 ctype, rchan, rwindow, rmaxpack);
1613
Damien Miller0bc1bd82000-11-13 22:57:25 +11001614 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1615 c = client_request_forwarded_tcpip(ctype, rchan);
1616 } else if (strcmp(ctype, "x11") == 0) {
1617 c = client_request_x11(ctype, rchan);
1618 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1619 c = client_request_agent(ctype, rchan);
Damien Millerbd483e72000-04-30 10:00:53 +10001620 }
1621/* XXX duplicate : */
1622 if (c != NULL) {
1623 debug("confirm %s", ctype);
1624 c->remote_id = rchan;
1625 c->remote_window = rwindow;
1626 c->remote_maxpacket = rmaxpack;
Ben Lindstroma69d89b2001-05-09 00:01:18 +00001627 if (c->type != SSH_CHANNEL_CONNECTING) {
1628 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1629 packet_put_int(c->remote_id);
1630 packet_put_int(c->self);
1631 packet_put_int(c->local_window);
1632 packet_put_int(c->local_maxpacket);
1633 packet_send();
1634 }
Damien Millerbd483e72000-04-30 10:00:53 +10001635 } else {
1636 debug("failure %s", ctype);
1637 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1638 packet_put_int(rchan);
1639 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
Ben Lindstromf3436742001-04-29 19:52:00 +00001640 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Ben Lindstroma69d89b2001-05-09 00:01:18 +00001641 packet_put_cstring("open failed");
Ben Lindstromf3436742001-04-29 19:52:00 +00001642 packet_put_cstring("");
1643 }
Damien Millerbd483e72000-04-30 10:00:53 +10001644 packet_send();
1645 }
1646 xfree(ctype);
1647}
Ben Lindstrombba81212001-06-25 05:01:22 +00001648static void
Damien Miller630d6f42002-01-22 23:17:30 +11001649client_input_channel_req(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom5b828322001-02-09 01:34:36 +00001650{
1651 Channel *c = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +10001652 int exitval, id, reply, success = 0;
Ben Lindstrom5b828322001-02-09 01:34:36 +00001653 char *rtype;
1654
1655 id = packet_get_int();
1656 rtype = packet_get_string(NULL);
1657 reply = packet_get_char();
1658
1659 debug("client_input_channel_req: channel %d rtype %s reply %d",
1660 id, rtype, reply);
1661
Damien Miller3bbd8782004-06-18 22:23:22 +10001662 if (id == -1) {
1663 error("client_input_channel_req: request for channel -1");
1664 } else if ((c = channel_lookup(id)) == NULL) {
Ben Lindstrom5b828322001-02-09 01:34:36 +00001665 error("client_input_channel_req: channel %d: unknown channel", id);
1666 } else if (strcmp(rtype, "exit-status") == 0) {
Damien Miller0e220db2004-06-15 10:34:08 +10001667 exitval = packet_get_int();
1668 if (id == session_ident) {
1669 success = 1;
1670 exit_status = exitval;
1671 } else if (c->ctl_fd == -1) {
1672 error("client_input_channel_req: unexpected channel %d",
1673 session_ident);
1674 } else {
1675 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1676 success = 1;
1677 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001678 packet_check_eom();
Ben Lindstrom5b828322001-02-09 01:34:36 +00001679 }
1680 if (reply) {
1681 packet_start(success ?
1682 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
Damien Miller3bbd8782004-06-18 22:23:22 +10001683 packet_put_int(id);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001684 packet_send();
1685 }
1686 xfree(rtype);
1687}
Damien Millerc3fa4072002-01-22 23:21:58 +11001688static void
1689client_input_global_request(int type, u_int32_t seq, void *ctxt)
1690{
1691 char *rtype;
1692 int want_reply;
1693 int success = 0;
1694
1695 rtype = packet_get_string(NULL);
1696 want_reply = packet_get_char();
Damien Miller509b0102003-12-17 16:33:10 +11001697 debug("client_input_global_request: rtype %s want_reply %d",
1698 rtype, want_reply);
Damien Millerc3fa4072002-01-22 23:21:58 +11001699 if (want_reply) {
1700 packet_start(success ?
1701 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1702 packet_send();
1703 packet_write_wait();
1704 }
1705 xfree(rtype);
1706}
Damien Millerbd483e72000-04-30 10:00:53 +10001707
Damien Miller0e220db2004-06-15 10:34:08 +10001708void
Darren Tuckerfc959702004-07-17 16:12:08 +10001709client_session2_setup(int id, int want_tty, int want_subsystem,
Damien Miller3756dce2004-06-18 01:17:29 +10001710 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
Damien Miller0e220db2004-06-15 10:34:08 +10001711 dispatch_fn *subsys_repl)
1712{
1713 int len;
Darren Tucker5d78de62004-11-05 20:35:44 +11001714 Channel *c = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +10001715
1716 debug2("%s: id %d", __func__, id);
1717
Darren Tucker5d78de62004-11-05 20:35:44 +11001718 if ((c = channel_lookup(id)) == NULL)
1719 fatal("client_session2_setup: channel %d: unknown channel", id);
1720
Damien Miller0e220db2004-06-15 10:34:08 +10001721 if (want_tty) {
1722 struct winsize ws;
1723 struct termios tio;
1724
1725 /* Store window size in the packet. */
1726 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1727 memset(&ws, 0, sizeof(ws));
1728
1729 channel_request_start(id, "pty-req", 0);
1730 packet_put_cstring(term != NULL ? term : "");
1731 packet_put_int(ws.ws_col);
1732 packet_put_int(ws.ws_row);
1733 packet_put_int(ws.ws_xpixel);
1734 packet_put_int(ws.ws_ypixel);
1735 tio = get_saved_tio();
1736 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1737 packet_send();
1738 /* XXX wait for reply */
Darren Tucker5d78de62004-11-05 20:35:44 +11001739 c->client_tty = 1;
Damien Miller0e220db2004-06-15 10:34:08 +10001740 }
1741
1742 /* Transfer any environment variables from client to server */
Damien Miller3756dce2004-06-18 01:17:29 +10001743 if (options.num_send_env != 0 && env != NULL) {
Damien Miller0e220db2004-06-15 10:34:08 +10001744 int i, j, matched;
Damien Miller0e220db2004-06-15 10:34:08 +10001745 char *name, *val;
1746
1747 debug("Sending environment.");
Damien Miller3756dce2004-06-18 01:17:29 +10001748 for (i = 0; env[i] != NULL; i++) {
Damien Miller0e220db2004-06-15 10:34:08 +10001749 /* Split */
Damien Miller3756dce2004-06-18 01:17:29 +10001750 name = xstrdup(env[i]);
Damien Miller0e220db2004-06-15 10:34:08 +10001751 if ((val = strchr(name, '=')) == NULL) {
1752 free(name);
1753 continue;
1754 }
1755 *val++ = '\0';
1756
1757 matched = 0;
1758 for (j = 0; j < options.num_send_env; j++) {
1759 if (match_pattern(name, options.send_env[j])) {
1760 matched = 1;
1761 break;
1762 }
1763 }
1764 if (!matched) {
1765 debug3("Ignored env %s", name);
1766 free(name);
1767 continue;
1768 }
1769
1770 debug("Sending env %s = %s", name, val);
1771 channel_request_start(id, "env", 0);
1772 packet_put_cstring(name);
1773 packet_put_cstring(val);
1774 packet_send();
1775 free(name);
1776 }
1777 }
1778
1779 len = buffer_len(cmd);
1780 if (len > 0) {
1781 if (len > 900)
1782 len = 900;
1783 if (want_subsystem) {
1784 debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1785 channel_request_start(id, "subsystem", subsys_repl != NULL);
1786 if (subsys_repl != NULL) {
1787 /* register callback for reply */
1788 /* XXX we assume that client_loop has already been called */
1789 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1790 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1791 }
1792 } else {
1793 debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1794 channel_request_start(id, "exec", 0);
1795 }
1796 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1797 packet_send();
1798 } else {
1799 channel_request_start(id, "shell", 0);
1800 packet_send();
1801 }
1802}
1803
Ben Lindstrombba81212001-06-25 05:01:22 +00001804static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001805client_init_dispatch_20(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001806{
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001807 dispatch_init(&dispatch_protocol_error);
Damien Miller2797f7f2002-04-23 21:09:44 +10001808
Damien Miller1383bd82000-04-06 12:32:37 +10001809 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1810 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1811 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1812 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
Damien Millerbd483e72000-04-30 10:00:53 +10001813 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
Damien Miller1383bd82000-04-06 12:32:37 +10001814 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1815 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001816 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
Damien Miller1383bd82000-04-06 12:32:37 +10001817 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
Damien Millerc3fa4072002-01-22 23:21:58 +11001818 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001819
1820 /* rekeying */
1821 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
Damien Miller2797f7f2002-04-23 21:09:44 +10001822
1823 /* global request reply messages */
1824 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1825 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
Damien Miller1383bd82000-04-06 12:32:37 +10001826}
Ben Lindstrombba81212001-06-25 05:01:22 +00001827static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001828client_init_dispatch_13(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001829{
1830 dispatch_init(NULL);
1831 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1832 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1833 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
Damien Millerb38eff82000-04-01 11:09:21 +10001834 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1835 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1836 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001837 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1838 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1839 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
Damien Miller69b69aa2000-10-28 14:19:58 +11001840
1841 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
Darren Tucker5dcdd212003-10-02 16:17:00 +10001842 &client_input_agent_open : &deny_input_open);
Damien Miller69b69aa2000-10-28 14:19:58 +11001843 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1844 &x11_input_open : &deny_input_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001845}
Ben Lindstrombba81212001-06-25 05:01:22 +00001846static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001847client_init_dispatch_15(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001848{
1849 client_init_dispatch_13();
1850 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1851 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1852}
Ben Lindstromdb47f382001-07-04 05:10:27 +00001853static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001854client_init_dispatch(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001855{
Damien Miller1383bd82000-04-06 12:32:37 +10001856 if (compat20)
1857 client_init_dispatch_20();
1858 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001859 client_init_dispatch_13();
1860 else
1861 client_init_dispatch_15();
1862}
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001863
1864/* client specific fatal cleanup */
1865void
Darren Tucker3e33cec2003-10-02 16:12:36 +10001866cleanup_exit(int i)
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001867{
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001868 leave_raw_mode();
1869 leave_non_blocking();
Damien Miller0e220db2004-06-15 10:34:08 +10001870 if (options.control_path != NULL && control_fd != -1)
1871 unlink(options.control_path);
Darren Tucker3e33cec2003-10-02 16:12:36 +10001872 _exit(i);
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001873}