Raise WARNS in secure/ as high as possible and fix some resulting warnings.
[dragonfly.git] / crypto / openssh / clientloop.c
CommitLineData
40c002af 1/* $OpenBSD: clientloop.c,v 1.213 2009/07/05 19:28:33 stevesk Exp $ */
16c343f1
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2/*
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
6 * The main loop for the interactive session (client side).
7 *
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 *
14 *
15 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 *
38 * SSH2 support added by Markus Friedl.
39 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
60 */
61
62#include "includes.h"
63
64#include <sys/types.h>
65#include <sys/ioctl.h>
66#include <sys/param.h>
67#ifdef HAVE_SYS_STAT_H
68# include <sys/stat.h>
69#endif
70#ifdef HAVE_SYS_TIME_H
71# include <sys/time.h>
72#endif
73#include <sys/socket.h>
74
75#include <ctype.h>
76#include <errno.h>
77#ifdef HAVE_PATHS_H
78#include <paths.h>
79#endif
80#include <signal.h>
81#include <stdarg.h>
82#include <stdio.h>
83#include <stdlib.h>
84#include <string.h>
85#include <termios.h>
86#include <pwd.h>
87#include <unistd.h>
88
3b69e377 89#include "openbsd-compat/sys-queue.h"
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90#include "xmalloc.h"
91#include "ssh.h"
92#include "ssh1.h"
93#include "ssh2.h"
94#include "packet.h"
95#include "buffer.h"
96#include "compat.h"
97#include "channels.h"
98#include "dispatch.h"
99#include "key.h"
100#include "cipher.h"
101#include "kex.h"
102#include "log.h"
103#include "readconf.h"
104#include "clientloop.h"
105#include "sshconnect.h"
106#include "authfd.h"
107#include "atomicio.h"
108#include "sshpty.h"
109#include "misc.h"
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110#include "match.h"
111#include "msg.h"
40c002af 112#include "roaming.h"
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113
114/* import options */
115extern Options options;
116
117/* Flag indicating that stdin should be redirected from /dev/null. */
118extern int stdin_null_flag;
119
120/* Flag indicating that no shell has been requested */
121extern int no_shell_flag;
122
123/* Control socket */
3b69e377 124extern int muxserver_sock;
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125
126/*
127 * Name of the host we are connecting to. This is the name given on the
128 * command line, or the HostName specified for the user-supplied name in a
129 * configuration file.
130 */
131extern char *host;
132
133/*
134 * Flag to indicate that we have received a window change signal which has
135 * not yet been processed. This will cause a message indicating the new
136 * window size to be sent to the server a little later. This is volatile
137 * because this is updated in a signal handler.
138 */
139static volatile sig_atomic_t received_window_change_signal = 0;
140static volatile sig_atomic_t received_signal = 0;
141
142/* Flag indicating whether the user's terminal is in non-blocking mode. */
143static int in_non_blocking_mode = 0;
144
145/* Common data for the client loop code. */
146static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
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147static int escape_char1; /* Escape character. (proto1 only) */
148static int escape_pending1; /* Last character was an escape (proto1 only) */
16c343f1 149static int last_was_cr; /* Last character was a newline. */
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150static int exit_status; /* Used to store the command exit status. */
151static int stdin_eof; /* EOF has been encountered on stderr. */
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152static Buffer stdin_buffer; /* Buffer for stdin data. */
153static Buffer stdout_buffer; /* Buffer for stdout data. */
154static Buffer stderr_buffer; /* Buffer for stderr data. */
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155static u_int buffer_high;/* Soft max buffer size. */
156static int connection_in; /* Connection to server (input). */
157static int connection_out; /* Connection to server (output). */
158static int need_rekeying; /* Set to non-zero if rekeying is requested. */
159static int session_closed = 0; /* In SSH2: login session closed. */
160
161static void client_init_dispatch(void);
162int session_ident = -1;
163
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164/* Track escape per proto2 channel */
165struct escape_filter_ctx {
166 int escape_pending;
167 int escape_char;
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168};
169
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170/* Context for channel confirmation replies */
171struct channel_reply_ctx {
172 const char *request_type;
173 int id, do_close;
174};
175
176/* Global request success/failure callbacks */
177struct global_confirm {
178 TAILQ_ENTRY(global_confirm) entry;
179 global_confirm_cb *cb;
180 void *ctx;
181 int ref_count;
182};
183TAILQ_HEAD(global_confirms, global_confirm);
184static struct global_confirms global_confirms =
185 TAILQ_HEAD_INITIALIZER(global_confirms);
186
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187/*XXX*/
188extern Kex *xxx_kex;
189
190void ssh_process_session2_setup(int, int, int, Buffer *);
191
192/* Restores stdin to blocking mode. */
193
194static void
195leave_non_blocking(void)
196{
197 if (in_non_blocking_mode) {
198 unset_nonblock(fileno(stdin));
199 in_non_blocking_mode = 0;
200 }
201}
202
203/* Puts stdin terminal in non-blocking mode. */
204
205static void
206enter_non_blocking(void)
207{
208 in_non_blocking_mode = 1;
209 set_nonblock(fileno(stdin));
210}
211
212/*
213 * Signal handler for the window change signal (SIGWINCH). This just sets a
214 * flag indicating that the window has changed.
215 */
216/*ARGSUSED */
217static void
218window_change_handler(int sig)
219{
220 received_window_change_signal = 1;
221 signal(SIGWINCH, window_change_handler);
222}
223
224/*
225 * Signal handler for signals that cause the program to terminate. These
226 * signals must be trapped to restore terminal modes.
227 */
228/*ARGSUSED */
229static void
230signal_handler(int sig)
231{
232 received_signal = sig;
233 quit_pending = 1;
234}
235
236/*
237 * Returns current time in seconds from Jan 1, 1970 with the maximum
238 * available resolution.
239 */
240
241static double
242get_current_time(void)
243{
244 struct timeval tv;
245 gettimeofday(&tv, NULL);
246 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
247}
248
249#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
250void
251client_x11_get_proto(const char *display, const char *xauth_path,
252 u_int trusted, char **_proto, char **_data)
253{
254 char cmd[1024];
255 char line[512];
256 char xdisplay[512];
257 static char proto[512], data[512];
258 FILE *f;
259 int got_data = 0, generated = 0, do_unlink = 0, i;
260 char *xauthdir, *xauthfile;
261 struct stat st;
262
263 xauthdir = xauthfile = NULL;
264 *_proto = proto;
265 *_data = data;
266 proto[0] = data[0] = '\0';
267
268 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
269 debug("No xauth program.");
270 } else {
271 if (display == NULL) {
272 debug("x11_get_proto: DISPLAY not set");
273 return;
274 }
275 /*
276 * Handle FamilyLocal case where $DISPLAY does
277 * not match an authorization entry. For this we
278 * just try "xauth list unix:displaynum.screennum".
279 * XXX: "localhost" match to determine FamilyLocal
280 * is not perfect.
281 */
282 if (strncmp(display, "localhost:", 10) == 0) {
283 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
284 display + 10);
285 display = xdisplay;
286 }
287 if (trusted == 0) {
288 xauthdir = xmalloc(MAXPATHLEN);
289 xauthfile = xmalloc(MAXPATHLEN);
290 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
291 if (mkdtemp(xauthdir) != NULL) {
292 do_unlink = 1;
293 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
294 xauthdir);
295 snprintf(cmd, sizeof(cmd),
296 "%s -f %s generate %s " SSH_X11_PROTO
297 " untrusted timeout 1200 2>" _PATH_DEVNULL,
298 xauth_path, xauthfile, display);
299 debug2("x11_get_proto: %s", cmd);
300 if (system(cmd) == 0)
301 generated = 1;
302 }
303 }
304
305 /*
306 * When in untrusted mode, we read the cookie only if it was
307 * successfully generated as an untrusted one in the step
308 * above.
309 */
310 if (trusted || generated) {
311 snprintf(cmd, sizeof(cmd),
312 "%s %s%s list %s 2>" _PATH_DEVNULL,
313 xauth_path,
314 generated ? "-f " : "" ,
315 generated ? xauthfile : "",
316 display);
317 debug2("x11_get_proto: %s", cmd);
318 f = popen(cmd, "r");
319 if (f && fgets(line, sizeof(line), f) &&
320 sscanf(line, "%*s %511s %511s", proto, data) == 2)
321 got_data = 1;
322 if (f)
323 pclose(f);
324 } else
325 error("Warning: untrusted X11 forwarding setup failed: "
326 "xauth key data not generated");
327 }
328
329 if (do_unlink) {
330 unlink(xauthfile);
331 rmdir(xauthdir);
332 }
333 if (xauthdir)
334 xfree(xauthdir);
335 if (xauthfile)
336 xfree(xauthfile);
337
338 /*
339 * If we didn't get authentication data, just make up some
340 * data. The forwarding code will check the validity of the
341 * response anyway, and substitute this data. The X11
342 * server, however, will ignore this fake data and use
343 * whatever authentication mechanisms it was using otherwise
344 * for the local connection.
345 */
346 if (!got_data) {
347 u_int32_t rnd = 0;
348
349 logit("Warning: No xauth data; "
350 "using fake authentication data for X11 forwarding.");
351 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
352 for (i = 0; i < 16; i++) {
353 if (i % 4 == 0)
354 rnd = arc4random();
355 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
356 rnd & 0xff);
357 rnd >>= 8;
358 }
359 }
360}
361
362/*
363 * This is called when the interactive is entered. This checks if there is
364 * an EOF coming on stdin. We must check this explicitly, as select() does
365 * not appear to wake up when redirecting from /dev/null.
366 */
367
368static void
369client_check_initial_eof_on_stdin(void)
370{
371 int len;
372 char buf[1];
373
374 /*
375 * If standard input is to be "redirected from /dev/null", we simply
376 * mark that we have seen an EOF and send an EOF message to the
377 * server. Otherwise, we try to read a single character; it appears
378 * that for some files, such /dev/null, select() never wakes up for
379 * read for this descriptor, which means that we never get EOF. This
380 * way we will get the EOF if stdin comes from /dev/null or similar.
381 */
382 if (stdin_null_flag) {
383 /* Fake EOF on stdin. */
384 debug("Sending eof.");
385 stdin_eof = 1;
386 packet_start(SSH_CMSG_EOF);
387 packet_send();
388 } else {
389 enter_non_blocking();
390
391 /* Check for immediate EOF on stdin. */
392 len = read(fileno(stdin), buf, 1);
393 if (len == 0) {
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394 /*
395 * EOF. Record that we have seen it and send
396 * EOF to server.
397 */
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398 debug("Sending eof.");
399 stdin_eof = 1;
400 packet_start(SSH_CMSG_EOF);
401 packet_send();
402 } else if (len > 0) {
403 /*
404 * Got data. We must store the data in the buffer,
405 * and also process it as an escape character if
406 * appropriate.
407 */
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408 if ((u_char) buf[0] == escape_char1)
409 escape_pending1 = 1;
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410 else
411 buffer_append(&stdin_buffer, buf, 1);
412 }
413 leave_non_blocking();
414 }
415}
416
417
418/*
419 * Make packets from buffered stdin data, and buffer them for sending to the
420 * connection.
421 */
422
423static void
424client_make_packets_from_stdin_data(void)
425{
426 u_int len;
427
428 /* Send buffered stdin data to the server. */
429 while (buffer_len(&stdin_buffer) > 0 &&
430 packet_not_very_much_data_to_write()) {
431 len = buffer_len(&stdin_buffer);
432 /* Keep the packets at reasonable size. */
433 if (len > packet_get_maxsize())
434 len = packet_get_maxsize();
435 packet_start(SSH_CMSG_STDIN_DATA);
436 packet_put_string(buffer_ptr(&stdin_buffer), len);
437 packet_send();
438 buffer_consume(&stdin_buffer, len);
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439 /* If we have a pending EOF, send it now. */
440 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
441 packet_start(SSH_CMSG_EOF);
442 packet_send();
443 }
444 }
445}
446
447/*
448 * Checks if the client window has changed, and sends a packet about it to
449 * the server if so. The actual change is detected elsewhere (by a software
450 * interrupt on Unix); this just checks the flag and sends a message if
451 * appropriate.
452 */
453
454static void
455client_check_window_change(void)
456{
457 struct winsize ws;
458
459 if (! received_window_change_signal)
460 return;
461 /** XXX race */
462 received_window_change_signal = 0;
463
464 debug2("client_check_window_change: changed");
465
466 if (compat20) {
467 channel_send_window_changes();
468 } else {
469 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
470 return;
471 packet_start(SSH_CMSG_WINDOW_SIZE);
472 packet_put_int((u_int)ws.ws_row);
473 packet_put_int((u_int)ws.ws_col);
474 packet_put_int((u_int)ws.ws_xpixel);
475 packet_put_int((u_int)ws.ws_ypixel);
476 packet_send();
477 }
478}
479
480static void
481client_global_request_reply(int type, u_int32_t seq, void *ctxt)
482{
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483 struct global_confirm *gc;
484
485 if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
486 return;
487 if (gc->cb != NULL)
488 gc->cb(type, seq, gc->ctx);
489 if (--gc->ref_count <= 0) {
490 TAILQ_REMOVE(&global_confirms, gc, entry);
491 bzero(gc, sizeof(*gc));
492 xfree(gc);
493 }
494
40c002af 495 packet_set_alive_timeouts(0);
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496}
497
498static void
499server_alive_check(void)
500{
40c002af 501 if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
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502 logit("Timeout, server not responding.");
503 cleanup_exit(255);
504 }
505 packet_start(SSH2_MSG_GLOBAL_REQUEST);
506 packet_put_cstring("keepalive@openssh.com");
507 packet_put_char(1); /* boolean: want reply */
508 packet_send();
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509 /* Insert an empty placeholder to maintain ordering */
510 client_register_global_confirm(NULL, NULL);
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511}
512
513/*
514 * Waits until the client can do something (some data becomes available on
515 * one of the file descriptors).
516 */
517static void
518client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
519 int *maxfdp, u_int *nallocp, int rekeying)
520{
521 struct timeval tv, *tvp;
522 int ret;
523
524 /* Add any selections by the channel mechanism. */
525 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
526
527 if (!compat20) {
528 /* Read from the connection, unless our buffers are full. */
529 if (buffer_len(&stdout_buffer) < buffer_high &&
530 buffer_len(&stderr_buffer) < buffer_high &&
531 channel_not_very_much_buffered_data())
532 FD_SET(connection_in, *readsetp);
533 /*
534 * Read from stdin, unless we have seen EOF or have very much
535 * buffered data to send to the server.
536 */
537 if (!stdin_eof && packet_not_very_much_data_to_write())
538 FD_SET(fileno(stdin), *readsetp);
539
540 /* Select stdout/stderr if have data in buffer. */
541 if (buffer_len(&stdout_buffer) > 0)
542 FD_SET(fileno(stdout), *writesetp);
543 if (buffer_len(&stderr_buffer) > 0)
544 FD_SET(fileno(stderr), *writesetp);
545 } else {
546 /* channel_prepare_select could have closed the last channel */
547 if (session_closed && !channel_still_open() &&
548 !packet_have_data_to_write()) {
549 /* clear mask since we did not call select() */
550 memset(*readsetp, 0, *nallocp);
551 memset(*writesetp, 0, *nallocp);
552 return;
553 } else {
554 FD_SET(connection_in, *readsetp);
555 }
556 }
557
558 /* Select server connection if have data to write to the server. */
559 if (packet_have_data_to_write())
560 FD_SET(connection_out, *writesetp);
561
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562 if (muxserver_sock != -1)
563 FD_SET(muxserver_sock, *readsetp);
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564
565 /*
566 * Wait for something to happen. This will suspend the process until
567 * some selected descriptor can be read, written, or has some other
568 * event pending.
569 */
570
571 if (options.server_alive_interval == 0 || !compat20)
572 tvp = NULL;
573 else {
574 tv.tv_sec = options.server_alive_interval;
575 tv.tv_usec = 0;
576 tvp = &tv;
577 }
578 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
579 if (ret < 0) {
580 char buf[100];
581
582 /*
583 * We have to clear the select masks, because we return.
584 * We have to return, because the mainloop checks for the flags
585 * set by the signal handlers.
586 */
587 memset(*readsetp, 0, *nallocp);
588 memset(*writesetp, 0, *nallocp);
589
590 if (errno == EINTR)
591 return;
592 /* Note: we might still have data in the buffers. */
593 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
594 buffer_append(&stderr_buffer, buf, strlen(buf));
595 quit_pending = 1;
596 } else if (ret == 0)
597 server_alive_check();
598}
599
600static void
601client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
602{
603 /* Flush stdout and stderr buffers. */
604 if (buffer_len(bout) > 0)
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605 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
606 buffer_len(bout));
16c343f1 607 if (buffer_len(berr) > 0)
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608 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
609 buffer_len(berr));
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610
611 leave_raw_mode();
612
613 /*
614 * Free (and clear) the buffer to reduce the amount of data that gets
615 * written to swap.
616 */
617 buffer_free(bin);
618 buffer_free(bout);
619 buffer_free(berr);
620
621 /* Send the suspend signal to the program itself. */
622 kill(getpid(), SIGTSTP);
623
624 /* Reset window sizes in case they have changed */
625 received_window_change_signal = 1;
626
627 /* OK, we have been continued by the user. Reinitialize buffers. */
628 buffer_init(bin);
629 buffer_init(bout);
630 buffer_init(berr);
631
632 enter_raw_mode();
633}
634
635static void
636client_process_net_input(fd_set *readset)
637{
40c002af
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638 int len, cont = 0;
639 char buf[SSH_IOBUFSZ];
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640
641 /*
642 * Read input from the server, and add any such data to the buffer of
643 * the packet subsystem.
644 */
645 if (FD_ISSET(connection_in, readset)) {
646 /* Read as much as possible. */
40c002af
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647 len = roaming_read(connection_in, buf, sizeof(buf), &cont);
648 if (len == 0 && cont == 0) {
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649 /*
650 * Received EOF. The remote host has closed the
651 * connection.
652 */
653 snprintf(buf, sizeof buf,
654 "Connection to %.300s closed by remote host.\r\n",
655 host);
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656 buffer_append(&stderr_buffer, buf, strlen(buf));
657 quit_pending = 1;
658 return;
659 }
660 /*
661 * There is a kernel bug on Solaris that causes select to
662 * sometimes wake up even though there is no data available.
663 */
3b69e377
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664 if (len < 0 &&
665 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
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666 len = 0;
667
668 if (len < 0) {
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669 /*
670 * An error has encountered. Perhaps there is a
671 * network problem.
672 */
673 snprintf(buf, sizeof buf,
674 "Read from remote host %.300s: %.100s\r\n",
675 host, strerror(errno));
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676 buffer_append(&stderr_buffer, buf, strlen(buf));
677 quit_pending = 1;
678 return;
679 }
680 packet_process_incoming(buf, len);
681 }
682}
683
684static void
3b69e377 685client_status_confirm(int type, Channel *c, void *ctx)
16c343f1 686{
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687 struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
688 char errmsg[256];
689 int tochan;
690
691 /* XXX supress on mux _client_ quietmode */
692 tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
693 c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
694
695 if (type == SSH2_MSG_CHANNEL_SUCCESS) {
696 debug2("%s request accepted on channel %d",
697 cr->request_type, c->self);
698 } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
699 if (tochan) {
700 snprintf(errmsg, sizeof(errmsg),
701 "%s request failed\r\n", cr->request_type);
702 } else {
703 snprintf(errmsg, sizeof(errmsg),
704 "%s request failed on channel %d",
705 cr->request_type, c->self);
706 }
707 /* If error occurred on primary session channel, then exit */
708 if (cr->do_close && c->self == session_ident)
709 fatal("%s", errmsg);
710 /* If error occurred on mux client, append to their stderr */
711 if (tochan)
712 buffer_append(&c->extended, errmsg, strlen(errmsg));
713 else
714 error("%s", errmsg);
715 if (cr->do_close) {
716 chan_read_failed(c);
717 chan_write_failed(c);
718 }
16c343f1 719 }
3b69e377 720 xfree(cr);
16c343f1
PA
721}
722
723static void
3b69e377 724client_abandon_status_confirm(Channel *c, void *ctx)
16c343f1 725{
3b69e377 726 xfree(ctx);
16c343f1
PA
727}
728
729static void
3b69e377 730client_expect_confirm(int id, const char *request, int do_close)
16c343f1 731{
3b69e377 732 struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
16c343f1 733
3b69e377
PA
734 cr->request_type = request;
735 cr->do_close = do_close;
16c343f1 736
3b69e377
PA
737 channel_register_status_confirm(id, client_status_confirm,
738 client_abandon_status_confirm, cr);
739}
16c343f1 740
3b69e377
PA
741void
742client_register_global_confirm(global_confirm_cb *cb, void *ctx)
743{
744 struct global_confirm *gc, *last_gc;
745
746 /* Coalesce identical callbacks */
747 last_gc = TAILQ_LAST(&global_confirms, global_confirms);
748 if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
749 if (++last_gc->ref_count >= INT_MAX)
750 fatal("%s: last_gc->ref_count = %d",
751 __func__, last_gc->ref_count);
16c343f1
PA
752 return;
753 }
16c343f1 754
3b69e377
PA
755 gc = xmalloc(sizeof(*gc));
756 gc->cb = cb;
757 gc->ctx = ctx;
758 gc->ref_count = 1;
759 TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
16c343f1
PA
760}
761
762static void
763process_cmdline(void)
764{
765 void (*handler)(int);
766 char *s, *cmd, *cancel_host;
767 int delete = 0;
cb5eb4f1
PA
768 int local = 0, remote = 0, dynamic = 0;
769 int cancel_port;
16c343f1
PA
770 Forward fwd;
771
772 bzero(&fwd, sizeof(fwd));
773 fwd.listen_host = fwd.connect_host = NULL;
774
775 leave_raw_mode();
776 handler = signal(SIGINT, SIG_IGN);
777 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
778 if (s == NULL)
779 goto out;
780 while (isspace(*s))
781 s++;
782 if (*s == '-')
783 s++; /* Skip cmdline '-', if any */
784 if (*s == '\0')
785 goto out;
786
787 if (*s == 'h' || *s == 'H' || *s == '?') {
788 logit("Commands:");
789 logit(" -L[bind_address:]port:host:hostport "
790 "Request local forward");
791 logit(" -R[bind_address:]port:host:hostport "
792 "Request remote forward");
cb5eb4f1
PA
793 logit(" -D[bind_address:]port "
794 "Request dynamic forward");
16c343f1
PA
795 logit(" -KR[bind_address:]port "
796 "Cancel remote forward");
797 if (!options.permit_local_command)
798 goto out;
799 logit(" !args "
800 "Execute local command");
801 goto out;
802 }
803
804 if (*s == '!' && options.permit_local_command) {
805 s++;
806 ssh_local_cmd(s);
807 goto out;
808 }
809
810 if (*s == 'K') {
811 delete = 1;
812 s++;
813 }
cb5eb4f1
PA
814 if (*s == 'L')
815 local = 1;
816 else if (*s == 'R')
817 remote = 1;
818 else if (*s == 'D')
819 dynamic = 1;
820 else {
16c343f1
PA
821 logit("Invalid command.");
822 goto out;
823 }
cb5eb4f1
PA
824
825 if ((local || dynamic) && delete) {
16c343f1
PA
826 logit("Not supported.");
827 goto out;
828 }
cb5eb4f1 829 if (remote && delete && !compat20) {
16c343f1
PA
830 logit("Not supported for SSH protocol version 1.");
831 goto out;
832 }
833
834 while (isspace(*++s))
835 ;
836
837 if (delete) {
838 cancel_port = 0;
839 cancel_host = hpdelim(&s); /* may be NULL */
840 if (s != NULL) {
841 cancel_port = a2port(s);
842 cancel_host = cleanhostname(cancel_host);
843 } else {
844 cancel_port = a2port(cancel_host);
845 cancel_host = NULL;
846 }
cb5eb4f1 847 if (cancel_port <= 0) {
16c343f1
PA
848 logit("Bad forwarding close port");
849 goto out;
850 }
851 channel_request_rforward_cancel(cancel_host, cancel_port);
852 } else {
cb5eb4f1 853 if (!parse_forward(&fwd, s, dynamic, remote)) {
16c343f1
PA
854 logit("Bad forwarding specification.");
855 goto out;
856 }
cb5eb4f1 857 if (local || dynamic) {
16c343f1
PA
858 if (channel_setup_local_fwd_listener(fwd.listen_host,
859 fwd.listen_port, fwd.connect_host,
860 fwd.connect_port, options.gateway_ports) < 0) {
861 logit("Port forwarding failed.");
862 goto out;
863 }
864 } else {
865 if (channel_request_remote_forwarding(fwd.listen_host,
866 fwd.listen_port, fwd.connect_host,
867 fwd.connect_port) < 0) {
868 logit("Port forwarding failed.");
869 goto out;
870 }
871 }
872
873 logit("Forwarding port.");
874 }
875
876out:
877 signal(SIGINT, handler);
878 enter_raw_mode();
879 if (cmd)
880 xfree(cmd);
881 if (fwd.listen_host != NULL)
882 xfree(fwd.listen_host);
883 if (fwd.connect_host != NULL)
884 xfree(fwd.connect_host);
885}
886
3b69e377
PA
887/*
888 * Process the characters one by one, call with c==NULL for proto1 case.
889 */
16c343f1 890static int
3b69e377
PA
891process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
892 char *buf, int len)
16c343f1
PA
893{
894 char string[1024];
895 pid_t pid;
896 int bytes = 0;
897 u_int i;
898 u_char ch;
899 char *s;
3b69e377
PA
900 int *escape_pendingp, escape_char;
901 struct escape_filter_ctx *efc;
16c343f1 902
3b69e377
PA
903 if (c == NULL) {
904 escape_pendingp = &escape_pending1;
905 escape_char = escape_char1;
906 } else {
907 if (c->filter_ctx == NULL)
908 return 0;
909 efc = (struct escape_filter_ctx *)c->filter_ctx;
910 escape_pendingp = &efc->escape_pending;
911 escape_char = efc->escape_char;
912 }
913
16c343f1
PA
914 if (len <= 0)
915 return (0);
916
917 for (i = 0; i < (u_int)len; i++) {
918 /* Get one character at a time. */
919 ch = buf[i];
920
3b69e377 921 if (*escape_pendingp) {
16c343f1
PA
922 /* We have previously seen an escape character. */
923 /* Clear the flag now. */
3b69e377 924 *escape_pendingp = 0;
16c343f1
PA
925
926 /* Process the escaped character. */
927 switch (ch) {
928 case '.':
929 /* Terminate the connection. */
3b69e377
PA
930 snprintf(string, sizeof string, "%c.\r\n",
931 escape_char);
16c343f1
PA
932 buffer_append(berr, string, strlen(string));
933
3b69e377
PA
934 if (c && c->ctl_fd != -1) {
935 chan_read_failed(c);
936 chan_write_failed(c);
937 return 0;
938 } else
939 quit_pending = 1;
16c343f1
PA
940 return -1;
941
942 case 'Z' - 64:
3b69e377
PA
943 /* XXX support this for mux clients */
944 if (c && c->ctl_fd != -1) {
945 noescape:
946 snprintf(string, sizeof string,
947 "%c%c escape not available to "
948 "multiplexed sessions\r\n",
949 escape_char, ch);
950 buffer_append(berr, string,
951 strlen(string));
952 continue;
953 }
954 /* Suspend the program. Inform the user */
955 snprintf(string, sizeof string,
956 "%c^Z [suspend ssh]\r\n", escape_char);
16c343f1
PA
957 buffer_append(berr, string, strlen(string));
958
959 /* Restore terminal modes and suspend. */
960 client_suspend_self(bin, bout, berr);
961
962 /* We have been continued. */
963 continue;
964
965 case 'B':
966 if (compat20) {
967 snprintf(string, sizeof string,
968 "%cB\r\n", escape_char);
969 buffer_append(berr, string,
970 strlen(string));
971 channel_request_start(session_ident,
972 "break", 0);
973 packet_put_int(1000);
974 packet_send();
975 }
976 continue;
977
978 case 'R':
979 if (compat20) {
980 if (datafellows & SSH_BUG_NOREKEY)
3b69e377
PA
981 logit("Server does not "
982 "support re-keying");
16c343f1
PA
983 else
984 need_rekeying = 1;
985 }
986 continue;
987
988 case '&':
3b69e377
PA
989 if (c && c->ctl_fd != -1)
990 goto noescape;
16c343f1 991 /*
3b69e377
PA
992 * Detach the program (continue to serve
993 * connections, but put in background and no
994 * more new connections).
16c343f1
PA
995 */
996 /* Restore tty modes. */
997 leave_raw_mode();
998
999 /* Stop listening for new connections. */
1000 channel_stop_listening();
1001
1002 snprintf(string, sizeof string,
1003 "%c& [backgrounded]\n", escape_char);
1004 buffer_append(berr, string, strlen(string));
1005
1006 /* Fork into background. */
1007 pid = fork();
1008 if (pid < 0) {
1009 error("fork: %.100s", strerror(errno));
1010 continue;
1011 }
1012 if (pid != 0) { /* This is the parent. */
1013 /* The parent just exits. */
1014 exit(0);
1015 }
1016 /* The child continues serving connections. */
1017 if (compat20) {
1018 buffer_append(bin, "\004", 1);
1019 /* fake EOF on stdin */
1020 return -1;
1021 } else if (!stdin_eof) {
1022 /*
3b69e377
PA
1023 * Sending SSH_CMSG_EOF alone does not
1024 * always appear to be enough. So we
1025 * try to send an EOF character first.
16c343f1
PA
1026 */
1027 packet_start(SSH_CMSG_STDIN_DATA);
1028 packet_put_string("\004", 1);
1029 packet_send();
1030 /* Close stdin. */
1031 stdin_eof = 1;
1032 if (buffer_len(bin) == 0) {
1033 packet_start(SSH_CMSG_EOF);
1034 packet_send();
1035 }
1036 }
1037 continue;
1038
1039 case '?':
3b69e377
PA
1040 if (c && c->ctl_fd != -1) {
1041 snprintf(string, sizeof string,
1042"%c?\r\n\
1043Supported escape sequences:\r\n\
1044 %c. - terminate session\r\n\
1045 %cB - send a BREAK to the remote system\r\n\
3b69e377
PA
1046 %cR - Request rekey (SSH protocol 2 only)\r\n\
1047 %c# - list forwarded connections\r\n\
1048 %c? - this message\r\n\
1049 %c%c - send the escape character by typing it twice\r\n\
1050(Note that escapes are only recognized immediately after newline.)\r\n",
1051 escape_char, escape_char,
1052 escape_char, escape_char,
1053 escape_char, escape_char,
cb5eb4f1 1054 escape_char, escape_char);
3b69e377
PA
1055 } else {
1056 snprintf(string, sizeof string,
16c343f1
PA
1057"%c?\r\n\
1058Supported escape sequences:\r\n\
3b69e377
PA
1059 %c. - terminate connection (and any multiplexed sessions)\r\n\
1060 %cB - send a BREAK to the remote system\r\n\
1061 %cC - open a command line\r\n\
1062 %cR - Request rekey (SSH protocol 2 only)\r\n\
1063 %c^Z - suspend ssh\r\n\
1064 %c# - list forwarded connections\r\n\
1065 %c& - background ssh (when waiting for connections to terminate)\r\n\
1066 %c? - this message\r\n\
1067 %c%c - send the escape character by typing it twice\r\n\
16c343f1 1068(Note that escapes are only recognized immediately after newline.)\r\n",
3b69e377
PA
1069 escape_char, escape_char,
1070 escape_char, escape_char,
1071 escape_char, escape_char,
1072 escape_char, escape_char,
1073 escape_char, escape_char,
1074 escape_char);
1075 }
16c343f1
PA
1076 buffer_append(berr, string, strlen(string));
1077 continue;
1078
1079 case '#':
3b69e377
PA
1080 snprintf(string, sizeof string, "%c#\r\n",
1081 escape_char);
16c343f1
PA
1082 buffer_append(berr, string, strlen(string));
1083 s = channel_open_message();
1084 buffer_append(berr, s, strlen(s));
1085 xfree(s);
1086 continue;
1087
1088 case 'C':
cb5eb4f1
PA
1089 if (c && c->ctl_fd != -1)
1090 goto noescape;
16c343f1
PA
1091 process_cmdline();
1092 continue;
1093
1094 default:
1095 if (ch != escape_char) {
1096 buffer_put_char(bin, escape_char);
1097 bytes++;
1098 }
1099 /* Escaped characters fall through here */
1100 break;
1101 }
1102 } else {
1103 /*
3b69e377
PA
1104 * The previous character was not an escape char.
1105 * Check if this is an escape.
16c343f1
PA
1106 */
1107 if (last_was_cr && ch == escape_char) {
3b69e377
PA
1108 /*
1109 * It is. Set the flag and continue to
1110 * next character.
1111 */
1112 *escape_pendingp = 1;
16c343f1
PA
1113 continue;
1114 }
1115 }
1116
1117 /*
1118 * Normal character. Record whether it was a newline,
1119 * and append it to the buffer.
1120 */
1121 last_was_cr = (ch == '\r' || ch == '\n');
1122 buffer_put_char(bin, ch);
1123 bytes++;
1124 }
1125 return bytes;
1126}
1127
1128static void
1129client_process_input(fd_set *readset)
1130{
1131 int len;
40c002af 1132 char buf[SSH_IOBUFSZ];
16c343f1
PA
1133
1134 /* Read input from stdin. */
1135 if (FD_ISSET(fileno(stdin), readset)) {
1136 /* Read as much as possible. */
1137 len = read(fileno(stdin), buf, sizeof(buf));
3b69e377
PA
1138 if (len < 0 &&
1139 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
16c343f1
PA
1140 return; /* we'll try again later */
1141 if (len <= 0) {
1142 /*
1143 * Received EOF or error. They are treated
1144 * similarly, except that an error message is printed
1145 * if it was an error condition.
1146 */
1147 if (len < 0) {
3b69e377
PA
1148 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1149 strerror(errno));
16c343f1
PA
1150 buffer_append(&stderr_buffer, buf, strlen(buf));
1151 }
1152 /* Mark that we have seen EOF. */
1153 stdin_eof = 1;
1154 /*
1155 * Send an EOF message to the server unless there is
1156 * data in the buffer. If there is data in the
1157 * buffer, no message will be sent now. Code
1158 * elsewhere will send the EOF when the buffer
1159 * becomes empty if stdin_eof is set.
1160 */
1161 if (buffer_len(&stdin_buffer) == 0) {
1162 packet_start(SSH_CMSG_EOF);
1163 packet_send();
1164 }
3b69e377 1165 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
16c343f1
PA
1166 /*
1167 * Normal successful read, and no escape character.
1168 * Just append the data to buffer.
1169 */
1170 buffer_append(&stdin_buffer, buf, len);
1171 } else {
1172 /*
3b69e377
PA
1173 * Normal, successful read. But we have an escape
1174 * character and have to process the characters one
1175 * by one.
16c343f1 1176 */
3b69e377
PA
1177 if (process_escapes(NULL, &stdin_buffer,
1178 &stdout_buffer, &stderr_buffer, buf, len) == -1)
16c343f1
PA
1179 return;
1180 }
1181 }
1182}
1183
1184static void
1185client_process_output(fd_set *writeset)
1186{
1187 int len;
1188 char buf[100];
1189
1190 /* Write buffered output to stdout. */
1191 if (FD_ISSET(fileno(stdout), writeset)) {
1192 /* Write as much data as possible. */
1193 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1194 buffer_len(&stdout_buffer));
1195 if (len <= 0) {
3b69e377
PA
1196 if (errno == EINTR || errno == EAGAIN ||
1197 errno == EWOULDBLOCK)
16c343f1
PA
1198 len = 0;
1199 else {
1200 /*
1201 * An error or EOF was encountered. Put an
1202 * error message to stderr buffer.
1203 */
3b69e377
PA
1204 snprintf(buf, sizeof buf,
1205 "write stdout: %.50s\r\n", strerror(errno));
16c343f1
PA
1206 buffer_append(&stderr_buffer, buf, strlen(buf));
1207 quit_pending = 1;
1208 return;
1209 }
1210 }
1211 /* Consume printed data from the buffer. */
1212 buffer_consume(&stdout_buffer, len);
16c343f1
PA
1213 }
1214 /* Write buffered output to stderr. */
1215 if (FD_ISSET(fileno(stderr), writeset)) {
1216 /* Write as much data as possible. */
1217 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1218 buffer_len(&stderr_buffer));
1219 if (len <= 0) {
3b69e377
PA
1220 if (errno == EINTR || errno == EAGAIN ||
1221 errno == EWOULDBLOCK)
16c343f1
PA
1222 len = 0;
1223 else {
3b69e377
PA
1224 /*
1225 * EOF or error, but can't even print
1226 * error message.
1227 */
16c343f1
PA
1228 quit_pending = 1;
1229 return;
1230 }
1231 }
1232 /* Consume printed characters from the buffer. */
1233 buffer_consume(&stderr_buffer, len);
16c343f1
PA
1234 }
1235}
1236
1237/*
1238 * Get packets from the connection input buffer, and process them as long as
1239 * there are packets available.
1240 *
1241 * Any unknown packets received during the actual
1242 * session cause the session to terminate. This is
1243 * intended to make debugging easier since no
1244 * confirmations are sent. Any compatible protocol
1245 * extensions must be negotiated during the
1246 * preparatory phase.
1247 */
1248
1249static void
1250client_process_buffered_input_packets(void)
1251{
3b69e377
PA
1252 dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1253 compat20 ? xxx_kex : NULL);
16c343f1
PA
1254}
1255
1256/* scan buf[] for '~' before sending data to the peer */
1257
3b69e377
PA
1258/* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1259void *
1260client_new_escape_filter_ctx(int escape_char)
16c343f1 1261{
3b69e377
PA
1262 struct escape_filter_ctx *ret;
1263
1264 ret = xmalloc(sizeof(*ret));
1265 ret->escape_pending = 0;
1266 ret->escape_char = escape_char;
1267 return (void *)ret;
1268}
1269
1270/* Free the escape filter context on channel free */
1271void
1272client_filter_cleanup(int cid, void *ctx)
1273{
1274 xfree(ctx);
1275}
1276
1277int
1278client_simple_escape_filter(Channel *c, char *buf, int len)
1279{
1280 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1281 return 0;
1282
1283 return process_escapes(c, &c->input, &c->output, &c->extended,
1284 buf, len);
16c343f1
PA
1285}
1286
1287static void
1288client_channel_closed(int id, void *arg)
1289{
1290 channel_cancel_cleanup(id);
1291 session_closed = 1;
1292 leave_raw_mode();
1293}
1294
1295/*
1296 * Implements the interactive session with the server. This is called after
1297 * the user has been authenticated, and a command has been started on the
1298 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1299 * used as an escape character for terminating or suspending the session.
1300 */
1301
1302int
1303client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1304{
1305 fd_set *readset = NULL, *writeset = NULL;
1306 double start_time, total_time;
1307 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
3b69e377 1308 u_int64_t ibytes, obytes;
16c343f1
PA
1309 u_int nalloc = 0;
1310 char buf[100];
1311
1312 debug("Entering interactive session.");
1313
1314 start_time = get_current_time();
1315
1316 /* Initialize variables. */
3b69e377 1317 escape_pending1 = 0;
16c343f1
PA
1318 last_was_cr = 1;
1319 exit_status = -1;
1320 stdin_eof = 0;
1321 buffer_high = 64 * 1024;
1322 connection_in = packet_get_connection_in();
1323 connection_out = packet_get_connection_out();
1324 max_fd = MAX(connection_in, connection_out);
3b69e377
PA
1325 if (muxserver_sock != -1)
1326 max_fd = MAX(max_fd, muxserver_sock);
16c343f1
PA
1327
1328 if (!compat20) {
1329 /* enable nonblocking unless tty */
1330 if (!isatty(fileno(stdin)))
1331 set_nonblock(fileno(stdin));
1332 if (!isatty(fileno(stdout)))
1333 set_nonblock(fileno(stdout));
1334 if (!isatty(fileno(stderr)))
1335 set_nonblock(fileno(stderr));
1336 max_fd = MAX(max_fd, fileno(stdin));
1337 max_fd = MAX(max_fd, fileno(stdout));
1338 max_fd = MAX(max_fd, fileno(stderr));
1339 }
16c343f1 1340 quit_pending = 0;
3b69e377 1341 escape_char1 = escape_char_arg;
16c343f1
PA
1342
1343 /* Initialize buffers. */
1344 buffer_init(&stdin_buffer);
1345 buffer_init(&stdout_buffer);
1346 buffer_init(&stderr_buffer);
1347
1348 client_init_dispatch();
1349
1350 /*
1351 * Set signal handlers, (e.g. to restore non-blocking mode)
1352 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1353 */
1354 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1355 signal(SIGHUP, signal_handler);
1356 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1357 signal(SIGINT, signal_handler);
1358 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1359 signal(SIGQUIT, signal_handler);
1360 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1361 signal(SIGTERM, signal_handler);
1362 signal(SIGWINCH, window_change_handler);
1363
1364 if (have_pty)
1365 enter_raw_mode();
1366
1367 if (compat20) {
1368 session_ident = ssh2_chan_id;
3b69e377 1369 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
16c343f1 1370 channel_register_filter(session_ident,
3b69e377
PA
1371 client_simple_escape_filter, NULL,
1372 client_filter_cleanup,
1373 client_new_escape_filter_ctx(escape_char_arg));
16c343f1
PA
1374 if (session_ident != -1)
1375 channel_register_cleanup(session_ident,
1376 client_channel_closed, 0);
1377 } else {
1378 /* Check if we should immediately send eof on stdin. */
1379 client_check_initial_eof_on_stdin();
1380 }
1381
1382 /* Main loop of the client for the interactive session mode. */
1383 while (!quit_pending) {
1384
1385 /* Process buffered packets sent by the server. */
1386 client_process_buffered_input_packets();
1387
1388 if (compat20 && session_closed && !channel_still_open())
1389 break;
1390
1391 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1392
1393 if (rekeying) {
1394 debug("rekeying in progress");
1395 } else {
1396 /*
1397 * Make packets of buffered stdin data, and buffer
1398 * them for sending to the server.
1399 */
1400 if (!compat20)
1401 client_make_packets_from_stdin_data();
1402
1403 /*
1404 * Make packets from buffered channel data, and
1405 * enqueue them for sending to the server.
1406 */
1407 if (packet_not_very_much_data_to_write())
1408 channel_output_poll();
1409
1410 /*
1411 * Check if the window size has changed, and buffer a
1412 * message about it to the server if so.
1413 */
1414 client_check_window_change();
1415
1416 if (quit_pending)
1417 break;
1418 }
1419 /*
1420 * Wait until we have something to do (something becomes
1421 * available on one of the descriptors).
1422 */
1423 max_fd2 = max_fd;
1424 client_wait_until_can_do_something(&readset, &writeset,
1425 &max_fd2, &nalloc, rekeying);
1426
1427 if (quit_pending)
1428 break;
1429
1430 /* Do channel operations unless rekeying in progress. */
1431 if (!rekeying) {
1432 channel_after_select(readset, writeset);
1433 if (need_rekeying || packet_need_rekeying()) {
1434 debug("need rekeying");
1435 xxx_kex->done = 0;
1436 kex_send_kexinit(xxx_kex);
1437 need_rekeying = 0;
1438 }
1439 }
1440
1441 /* Buffer input from the connection. */
1442 client_process_net_input(readset);
1443
1444 /* Accept control connections. */
3b69e377
PA
1445 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1446 if (muxserver_accept_control())
1447 quit_pending = 1;
1448 }
16c343f1
PA
1449
1450 if (quit_pending)
1451 break;
1452
1453 if (!compat20) {
1454 /* Buffer data from stdin */
1455 client_process_input(readset);
1456 /*
1457 * Process output to stdout and stderr. Output to
1458 * the connection is processed elsewhere (above).
1459 */
1460 client_process_output(writeset);
1461 }
1462
3b69e377
PA
1463 /*
1464 * Send as much buffered packet data as possible to the
1465 * sender.
1466 */
16c343f1
PA
1467 if (FD_ISSET(connection_out, writeset))
1468 packet_write_poll();
1469 }
1470 if (readset)
1471 xfree(readset);
1472 if (writeset)
1473 xfree(writeset);
1474
1475 /* Terminate the session. */
1476
1477 /* Stop watching for window change. */
1478 signal(SIGWINCH, SIG_DFL);
1479
40c002af
PA
1480 if (compat20) {
1481 packet_start(SSH2_MSG_DISCONNECT);
1482 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1483 packet_put_cstring("disconnected by user");
1484 packet_send();
1485 packet_write_wait();
1486 }
1487
16c343f1
PA
1488 channel_free_all();
1489
1490 if (have_pty)
1491 leave_raw_mode();
1492
1493 /* restore blocking io */
1494 if (!isatty(fileno(stdin)))
1495 unset_nonblock(fileno(stdin));
1496 if (!isatty(fileno(stdout)))
1497 unset_nonblock(fileno(stdout));
1498 if (!isatty(fileno(stderr)))
1499 unset_nonblock(fileno(stderr));
1500
1501 /*
1502 * If there was no shell or command requested, there will be no remote
1503 * exit status to be returned. In that case, clear error code if the
1504 * connection was deliberately terminated at this end.
1505 */
1506 if (no_shell_flag && received_signal == SIGTERM) {
1507 received_signal = 0;
1508 exit_status = 0;
1509 }
1510
1511 if (received_signal)
1512 fatal("Killed by signal %d.", (int) received_signal);
1513
1514 /*
1515 * In interactive mode (with pseudo tty) display a message indicating
1516 * that the connection has been closed.
1517 */
1518 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
3b69e377
PA
1519 snprintf(buf, sizeof buf,
1520 "Connection to %.64s closed.\r\n", host);
16c343f1
PA
1521 buffer_append(&stderr_buffer, buf, strlen(buf));
1522 }
1523
1524 /* Output any buffered data for stdout. */
1525 while (buffer_len(&stdout_buffer) > 0) {
1526 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1527 buffer_len(&stdout_buffer));
1528 if (len <= 0) {
1529 error("Write failed flushing stdout buffer.");
1530 break;
1531 }
1532 buffer_consume(&stdout_buffer, len);
16c343f1
PA
1533 }
1534
1535 /* Output any buffered data for stderr. */
1536 while (buffer_len(&stderr_buffer) > 0) {
1537 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1538 buffer_len(&stderr_buffer));
1539 if (len <= 0) {
1540 error("Write failed flushing stderr buffer.");
1541 break;
1542 }
1543 buffer_consume(&stderr_buffer, len);
16c343f1
PA
1544 }
1545
1546 /* Clear and free any buffers. */
1547 memset(buf, 0, sizeof(buf));
1548 buffer_free(&stdin_buffer);
1549 buffer_free(&stdout_buffer);
1550 buffer_free(&stderr_buffer);
1551
1552 /* Report bytes transferred, and transfer rates. */
1553 total_time = get_current_time() - start_time;
3b69e377
PA
1554 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1555 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
db42c6b8
SW
1556 verbose("Transferred: sent %ju, received %ju bytes, in %.1f seconds",
1557 (uintmax_t)obytes, (uintmax_t)ibytes, total_time);
16c343f1 1558 if (total_time > 0)
3b69e377
PA
1559 verbose("Bytes per second: sent %.1f, received %.1f",
1560 obytes / total_time, ibytes / total_time);
16c343f1
PA
1561 /* Return the exit status of the program. */
1562 debug("Exit status %d", exit_status);
1563 return exit_status;
1564}
1565
1566/*********/
1567
1568static void
1569client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1570{
1571 u_int data_len;
1572 char *data = packet_get_string(&data_len);
1573 packet_check_eom();
1574 buffer_append(&stdout_buffer, data, data_len);
1575 memset(data, 0, data_len);
1576 xfree(data);
1577}
1578static void
1579client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1580{
1581 u_int data_len;
1582 char *data = packet_get_string(&data_len);
1583 packet_check_eom();
1584 buffer_append(&stderr_buffer, data, data_len);
1585 memset(data, 0, data_len);
1586 xfree(data);
1587}
1588static void
1589client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1590{
1591 exit_status = packet_get_int();
1592 packet_check_eom();
1593 /* Acknowledge the exit. */
1594 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1595 packet_send();
1596 /*
1597 * Must wait for packet to be sent since we are
1598 * exiting the loop.
1599 */
1600 packet_write_wait();
1601 /* Flag that we want to exit. */
1602 quit_pending = 1;
1603}
1604static void
1605client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1606{
1607 Channel *c = NULL;
1608 int remote_id, sock;
1609
1610 /* Read the remote channel number from the message. */
1611 remote_id = packet_get_int();
1612 packet_check_eom();
1613
1614 /*
1615 * Get a connection to the local authentication agent (this may again
1616 * get forwarded).
1617 */
1618 sock = ssh_get_authentication_socket();
1619
1620 /*
1621 * If we could not connect the agent, send an error message back to
1622 * the server. This should never happen unless the agent dies,
1623 * because authentication forwarding is only enabled if we have an
1624 * agent.
1625 */
1626 if (sock >= 0) {
1627 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1628 -1, 0, 0, 0, "authentication agent connection", 1);
1629 c->remote_id = remote_id;
1630 c->force_drain = 1;
1631 }
1632 if (c == NULL) {
1633 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1634 packet_put_int(remote_id);
1635 } else {
1636 /* Send a confirmation to the remote host. */
1637 debug("Forwarding authentication connection.");
1638 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1639 packet_put_int(remote_id);
1640 packet_put_int(c->self);
1641 }
1642 packet_send();
1643}
1644
1645static Channel *
1646client_request_forwarded_tcpip(const char *request_type, int rchan)
1647{
1648 Channel *c = NULL;
1649 char *listen_address, *originator_address;
cb5eb4f1 1650 u_short listen_port, originator_port;
16c343f1
PA
1651
1652 /* Get rest of the packet */
1653 listen_address = packet_get_string(NULL);
1654 listen_port = packet_get_int();
1655 originator_address = packet_get_string(NULL);
1656 originator_port = packet_get_int();
1657 packet_check_eom();
1658
3b69e377
PA
1659 debug("client_request_forwarded_tcpip: listen %s port %d, "
1660 "originator %s port %d", listen_address, listen_port,
1661 originator_address, originator_port);
1662
1663 c = channel_connect_by_listen_address(listen_port,
1664 "forwarded-tcpip", originator_address);
16c343f1 1665
16c343f1
PA
1666 xfree(originator_address);
1667 xfree(listen_address);
1668 return c;
1669}
1670
1671static Channel *
1672client_request_x11(const char *request_type, int rchan)
1673{
1674 Channel *c = NULL;
1675 char *originator;
cb5eb4f1 1676 u_short originator_port;
16c343f1
PA
1677 int sock;
1678
1679 if (!options.forward_x11) {
1680 error("Warning: ssh server tried X11 forwarding.");
3b69e377
PA
1681 error("Warning: this is probably a break-in attempt by a "
1682 "malicious server.");
16c343f1
PA
1683 return NULL;
1684 }
1685 originator = packet_get_string(NULL);
1686 if (datafellows & SSH_BUG_X11FWD) {
1687 debug2("buggy server: x11 request w/o originator_port");
1688 originator_port = 0;
1689 } else {
1690 originator_port = packet_get_int();
1691 }
1692 packet_check_eom();
1693 /* XXX check permission */
1694 debug("client_request_x11: request from %s %d", originator,
1695 originator_port);
1696 xfree(originator);
1697 sock = x11_connect_display();
1698 if (sock < 0)
1699 return NULL;
c29cd1cc
PA
1700 /* again is this really necessary for X11? */
1701 if (options.hpn_disabled)
16c343f1
PA
1702 c = channel_new("x11",
1703 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1704 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
c29cd1cc
PA
1705 else
1706 c = channel_new("x11",
1707 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1708 options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
16c343f1
PA
1709 c->force_drain = 1;
1710 return c;
1711}
1712
1713static Channel *
1714client_request_agent(const char *request_type, int rchan)
1715{
1716 Channel *c = NULL;
1717 int sock;
1718
1719 if (!options.forward_agent) {
1720 error("Warning: ssh server tried agent forwarding.");
3b69e377
PA
1721 error("Warning: this is probably a break-in attempt by a "
1722 "malicious server.");
16c343f1
PA
1723 return NULL;
1724 }
1725 sock = ssh_get_authentication_socket();
1726 if (sock < 0)
1727 return NULL;
c29cd1cc 1728 if (options.hpn_disabled)
16c343f1
PA
1729 c = channel_new("authentication agent connection",
1730 SSH_CHANNEL_OPEN, sock, sock, -1,
c29cd1cc
PA
1731 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1732 "authentication agent connection", 1);
1733 else
1734 c = channel_new("authentication agent connection",
1735 SSH_CHANNEL_OPEN, sock, sock, -1,
1736 options.hpn_buffer_size, options.hpn_buffer_size, 0,
16c343f1
PA
1737 "authentication agent connection", 1);
1738 c->force_drain = 1;
1739 return c;
1740}
1741
1742int
1743client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1744{
1745 Channel *c;
1746 int fd;
1747
1748 if (tun_mode == SSH_TUNMODE_NO)
1749 return 0;
1750
1751 if (!compat20) {
cb5eb4f1 1752 error("Tunnel forwarding is not supported for protocol 1");
16c343f1
PA
1753 return -1;
1754 }
1755
1756 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1757
1758 /* Open local tunnel device */
1759 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1760 error("Tunnel device open failed.");
1761 return -1;
1762 }
1763
c29cd1cc
PA
1764 if(options.hpn_disabled)
1765 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1766 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1767 0, "tun", 1);
1768 else
16c343f1 1769 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
c29cd1cc
PA
1770 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1771 0, "tun", 1);
16c343f1
PA
1772 c->datagram = 1;
1773
c29cd1cc
PA
1774
1775
16c343f1
PA
1776#if defined(SSH_TUN_FILTER)
1777 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1778 channel_register_filter(c->self, sys_tun_infilter,
3b69e377 1779 sys_tun_outfilter, NULL, NULL);
16c343f1
PA
1780#endif
1781
1782 packet_start(SSH2_MSG_CHANNEL_OPEN);
1783 packet_put_cstring("tun@openssh.com");
1784 packet_put_int(c->self);
1785 packet_put_int(c->local_window_max);
1786 packet_put_int(c->local_maxpacket);
1787 packet_put_int(tun_mode);
1788 packet_put_int(remote_tun);
1789 packet_send();
1790
1791 return 0;
1792}
1793
1794/* XXXX move to generic input handler */
1795static void
1796client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1797{
1798 Channel *c = NULL;
1799 char *ctype;
1800 int rchan;
1801 u_int rmaxpack, rwindow, len;
1802
1803 ctype = packet_get_string(&len);
1804 rchan = packet_get_int();
1805 rwindow = packet_get_int();
1806 rmaxpack = packet_get_int();
1807
1808 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1809 ctype, rchan, rwindow, rmaxpack);
1810
1811 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1812 c = client_request_forwarded_tcpip(ctype, rchan);
1813 } else if (strcmp(ctype, "x11") == 0) {
1814 c = client_request_x11(ctype, rchan);
1815 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1816 c = client_request_agent(ctype, rchan);
1817 }
1818/* XXX duplicate : */
1819 if (c != NULL) {
1820 debug("confirm %s", ctype);
1821 c->remote_id = rchan;
1822 c->remote_window = rwindow;
1823 c->remote_maxpacket = rmaxpack;
1824 if (c->type != SSH_CHANNEL_CONNECTING) {
1825 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1826 packet_put_int(c->remote_id);
1827 packet_put_int(c->self);
1828 packet_put_int(c->local_window);
1829 packet_put_int(c->local_maxpacket);
1830 packet_send();
1831 }
1832 } else {
1833 debug("failure %s", ctype);
1834 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1835 packet_put_int(rchan);
1836 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1837 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1838 packet_put_cstring("open failed");
1839 packet_put_cstring("");
1840 }
1841 packet_send();
1842 }
1843 xfree(ctype);
1844}
1845static void
1846client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1847{
1848 Channel *c = NULL;
1849 int exitval, id, reply, success = 0;
1850 char *rtype;
1851
1852 id = packet_get_int();
1853 rtype = packet_get_string(NULL);
1854 reply = packet_get_char();
1855
1856 debug("client_input_channel_req: channel %d rtype %s reply %d",
1857 id, rtype, reply);
1858
1859 if (id == -1) {
1860 error("client_input_channel_req: request for channel -1");
1861 } else if ((c = channel_lookup(id)) == NULL) {
3b69e377
PA
1862 error("client_input_channel_req: channel %d: "
1863 "unknown channel", id);
1864 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1865 packet_check_eom();
1866 chan_rcvd_eow(c);
16c343f1
PA
1867 } else if (strcmp(rtype, "exit-status") == 0) {
1868 exitval = packet_get_int();
1869 if (id == session_ident) {
1870 success = 1;
1871 exit_status = exitval;
1872 } else if (c->ctl_fd == -1) {
1873 error("client_input_channel_req: unexpected channel %d",
1874 session_ident);
1875 } else {
1876 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1877 success = 1;
1878 }
1879 packet_check_eom();
1880 }
1881 if (reply) {
1882 packet_start(success ?
1883 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
cb5eb4f1 1884 packet_put_int(c->remote_id);
16c343f1
PA
1885 packet_send();
1886 }
1887 xfree(rtype);
1888}
1889static void
1890client_input_global_request(int type, u_int32_t seq, void *ctxt)
1891{
1892 char *rtype;
1893 int want_reply;
1894 int success = 0;
1895
1896 rtype = packet_get_string(NULL);
1897 want_reply = packet_get_char();
1898 debug("client_input_global_request: rtype %s want_reply %d",
1899 rtype, want_reply);
1900 if (want_reply) {
1901 packet_start(success ?
1902 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1903 packet_send();
1904 packet_write_wait();
1905 }
1906 xfree(rtype);
1907}
1908
1909void
1910client_session2_setup(int id, int want_tty, int want_subsystem,
3b69e377 1911 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
16c343f1
PA
1912{
1913 int len;
1914 Channel *c = NULL;
1915
1916 debug2("%s: id %d", __func__, id);
1917
1918 if ((c = channel_lookup(id)) == NULL)
1919 fatal("client_session2_setup: channel %d: unknown channel", id);
1920
1921 if (want_tty) {
1922 struct winsize ws;
16c343f1
PA
1923
1924 /* Store window size in the packet. */
1925 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1926 memset(&ws, 0, sizeof(ws));
1927
3b69e377
PA
1928 channel_request_start(id, "pty-req", 1);
1929 client_expect_confirm(id, "PTY allocation", 0);
16c343f1
PA
1930 packet_put_cstring(term != NULL ? term : "");
1931 packet_put_int((u_int)ws.ws_col);
1932 packet_put_int((u_int)ws.ws_row);
1933 packet_put_int((u_int)ws.ws_xpixel);
1934 packet_put_int((u_int)ws.ws_ypixel);
3b69e377
PA
1935 if (tiop == NULL)
1936 tiop = get_saved_tio();
1937 tty_make_modes(-1, tiop);
16c343f1
PA
1938 packet_send();
1939 /* XXX wait for reply */
1940 c->client_tty = 1;
1941 }
1942
1943 /* Transfer any environment variables from client to server */
1944 if (options.num_send_env != 0 && env != NULL) {
1945 int i, j, matched;
1946 char *name, *val;
1947
1948 debug("Sending environment.");
1949 for (i = 0; env[i] != NULL; i++) {
1950 /* Split */
1951 name = xstrdup(env[i]);
1952 if ((val = strchr(name, '=')) == NULL) {
1953 xfree(name);
1954 continue;
1955 }
1956 *val++ = '\0';
1957
1958 matched = 0;
1959 for (j = 0; j < options.num_send_env; j++) {
1960 if (match_pattern(name, options.send_env[j])) {
1961 matched = 1;
1962 break;
1963 }
1964 }
1965 if (!matched) {
1966 debug3("Ignored env %s", name);
1967 xfree(name);
1968 continue;
1969 }
1970
1971 debug("Sending env %s = %s", name, val);
1972 channel_request_start(id, "env", 0);
1973 packet_put_cstring(name);
1974 packet_put_cstring(val);
1975 packet_send();
1976 xfree(name);
1977 }
1978 }
1979
1980 len = buffer_len(cmd);
1981 if (len > 0) {
1982 if (len > 900)
1983 len = 900;
1984 if (want_subsystem) {
3b69e377
PA
1985 debug("Sending subsystem: %.*s",
1986 len, (u_char*)buffer_ptr(cmd));
1987 channel_request_start(id, "subsystem", 1);
1988 client_expect_confirm(id, "subsystem", 1);
16c343f1 1989 } else {
3b69e377
PA
1990 debug("Sending command: %.*s",
1991 len, (u_char*)buffer_ptr(cmd));
1992 channel_request_start(id, "exec", 1);
1993 client_expect_confirm(id, "exec", 1);
16c343f1
PA
1994 }
1995 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1996 packet_send();
1997 } else {
3b69e377
PA
1998 channel_request_start(id, "shell", 1);
1999 client_expect_confirm(id, "shell", 1);
16c343f1
PA
2000 packet_send();
2001 }
2002}
2003
2004static void
2005client_init_dispatch_20(void)
2006{
2007 dispatch_init(&dispatch_protocol_error);
2008
2009 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2010 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2011 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2012 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2013 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2014 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2015 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2016 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2017 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
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2018 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2019 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
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2020 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2021
2022 /* rekeying */
2023 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2024
2025 /* global request reply messages */
2026 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2027 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2028}
3b69e377 2029
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2030static void
2031client_init_dispatch_13(void)
2032{
2033 dispatch_init(NULL);
2034 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2035 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2036 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2037 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2038 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2039 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2040 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2041 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2042 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2043
2044 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2045 &client_input_agent_open : &deny_input_open);
2046 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2047 &x11_input_open : &deny_input_open);
2048}
3b69e377 2049
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2050static void
2051client_init_dispatch_15(void)
2052{
2053 client_init_dispatch_13();
2054 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2055 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2056}
3b69e377 2057
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2058static void
2059client_init_dispatch(void)
2060{
2061 if (compat20)
2062 client_init_dispatch_20();
2063 else if (compat13)
2064 client_init_dispatch_13();
2065 else
2066 client_init_dispatch_15();
2067}
2068
2069/* client specific fatal cleanup */
2070void
2071cleanup_exit(int i)
2072{
2073 leave_raw_mode();
2074 leave_non_blocking();
3b69e377 2075 if (options.control_path != NULL && muxserver_sock != -1)
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2076 unlink(options.control_path);
2077 _exit(i);
2078}