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5156b1a1 1/* $OpenBSD: clientloop.c,v 1.201 2008/07/16 11:51:14 djm Exp $ */
3c0ef626 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"
3c0ef626 63
30460aeb 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
5156b1a1 89#include "openbsd-compat/sys-queue.h"
30460aeb 90#include "xmalloc.h"
3c0ef626 91#include "ssh.h"
92#include "ssh1.h"
93#include "ssh2.h"
3c0ef626 94#include "packet.h"
95#include "buffer.h"
96#include "compat.h"
97#include "channels.h"
98#include "dispatch.h"
3c0ef626 99#include "key.h"
30460aeb 100#include "cipher.h"
3c0ef626 101#include "kex.h"
102#include "log.h"
103#include "readconf.h"
104#include "clientloop.h"
a7213e65 105#include "sshconnect.h"
3c0ef626 106#include "authfd.h"
107#include "atomicio.h"
a7213e65 108#include "sshpty.h"
3c0ef626 109#include "misc.h"
a7213e65 110#include "monitor_fdpass.h"
111#include "match.h"
112#include "msg.h"
3c0ef626 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
a7213e65 120/* Flag indicating that no shell has been requested */
121extern int no_shell_flag;
122
123/* Control socket */
5156b1a1 124extern int muxserver_sock;
a7213e65 125
3c0ef626 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 */
a7213e65 139static volatile sig_atomic_t received_window_change_signal = 0;
140static volatile sig_atomic_t received_signal = 0;
3c0ef626 141
a7213e65 142/* Flag indicating whether the user's terminal is in non-blocking mode. */
3c0ef626 143static int in_non_blocking_mode = 0;
144
145/* Common data for the client loop code. */
30460aeb 146static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
5156b1a1 147static int escape_char1; /* Escape character. (proto1 only) */
148static int escape_pending1; /* Last character was an escape (proto1 only) */
3c0ef626 149static int last_was_cr; /* Last character was a newline. */
5156b1a1 150static int exit_status; /* Used to store the command exit status. */
151static int stdin_eof; /* EOF has been encountered on stderr. */
3c0ef626 152static Buffer stdin_buffer; /* Buffer for stdin data. */
153static Buffer stdout_buffer; /* Buffer for stdout data. */
154static Buffer stderr_buffer; /* Buffer for stderr data. */
3c0ef626 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
5156b1a1 164/* Track escape per proto2 channel */
165struct escape_filter_ctx {
166 int escape_pending;
167 int escape_char;
a7213e65 168};
169
5156b1a1 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
3c0ef626 187/*XXX*/
188extern Kex *xxx_kex;
189
a7213e65 190void ssh_process_session2_setup(int, int, int, Buffer *);
191
3c0ef626 192/* Restores stdin to blocking mode. */
193
194static void
195leave_non_blocking(void)
196{
197 if (in_non_blocking_mode) {
a7213e65 198 unset_nonblock(fileno(stdin));
3c0ef626 199 in_non_blocking_mode = 0;
3c0ef626 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;
a7213e65 209 set_nonblock(fileno(stdin));
3c0ef626 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 */
30460aeb 216/*ARGSUSED */
3c0ef626 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 */
30460aeb 228/*ARGSUSED */
3c0ef626 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
a7213e65 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 }
fa0f0f45 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");
a7213e65 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
3c0ef626 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) {
5156b1a1 394 /*
395 * EOF. Record that we have seen it and send
396 * EOF to server.
397 */
3c0ef626 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 */
5156b1a1 408 if ((u_char) buf[0] == escape_char1)
409 escape_pending1 = 1;
3c0ef626 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 &&
a7213e65 430 packet_not_very_much_data_to_write()) {
3c0ef626 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);
3c0ef626 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
3c0ef626 464 debug2("client_check_window_change: changed");
465
466 if (compat20) {
a7213e65 467 channel_send_window_changes();
3c0ef626 468 } else {
a7213e65 469 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
470 return;
3c0ef626 471 packet_start(SSH_CMSG_WINDOW_SIZE);
30460aeb 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);
3c0ef626 476 packet_send();
477 }
478}
479
a7213e65 480static void
481client_global_request_reply(int type, u_int32_t seq, void *ctxt)
482{
5156b1a1 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
e74dc197 495 keep_alive_timeouts = 0;
a7213e65 496}
497
498static void
499server_alive_check(void)
500{
e74dc197 501 if (++keep_alive_timeouts > options.server_alive_count_max) {
240debe0 502 logit("Timeout, server not responding.");
503 cleanup_exit(255);
504 }
a7213e65 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();
5156b1a1 509 /* Insert an empty placeholder to maintain ordering */
510 client_register_global_confirm(NULL, NULL);
a7213e65 511}
512
3c0ef626 513/*
514 * Waits until the client can do something (some data becomes available on
515 * one of the file descriptors).
516 */
3c0ef626 517static void
518client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
a7213e65 519 int *maxfdp, u_int *nallocp, int rekeying)
3c0ef626 520{
a7213e65 521 struct timeval tv, *tvp;
522 int ret;
523
3c0ef626 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
5156b1a1 562 if (muxserver_sock != -1)
563 FD_SET(muxserver_sock, *readsetp);
a7213e65 564
3c0ef626 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
a7213e65 568 * event pending.
3c0ef626 569 */
570
a7213e65 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) {
3c0ef626 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;
a7213e65 596 } else if (ret == 0)
597 server_alive_check();
3c0ef626 598}
599
600static void
601client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
602{
3c0ef626 603 /* Flush stdout and stderr buffers. */
604 if (buffer_len(bout) > 0)
5156b1a1 605 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
606 buffer_len(bout));
3c0ef626 607 if (buffer_len(berr) > 0)
5156b1a1 608 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
609 buffer_len(berr));
3c0ef626 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
3c0ef626 621 /* Send the suspend signal to the program itself. */
622 kill(getpid(), SIGTSTP);
623
a7213e65 624 /* Reset window sizes in case they have changed */
625 received_window_change_signal = 1;
3c0ef626 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
30460aeb 636client_process_net_input(fd_set *readset)
3c0ef626 637{
638 int len;
639 char buf[8192];
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. */
647 len = read(connection_in, buf, sizeof(buf));
648 if (len == 0) {
5156b1a1 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);
3c0ef626 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 */
5156b1a1 664 if (len < 0 &&
665 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
3c0ef626 666 len = 0;
667
668 if (len < 0) {
5156b1a1 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));
3c0ef626 676 buffer_append(&stderr_buffer, buf, strlen(buf));
677 quit_pending = 1;
678 return;
679 }
680 packet_process_incoming(buf, len);
681 }
682}
683
a7213e65 684static void
5156b1a1 685client_status_confirm(int type, Channel *c, void *ctx)
a7213e65 686{
5156b1a1 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 }
a7213e65 719 }
5156b1a1 720 xfree(cr);
a7213e65 721}
722
723static void
5156b1a1 724client_abandon_status_confirm(Channel *c, void *ctx)
a7213e65 725{
5156b1a1 726 xfree(ctx);
a7213e65 727}
728
729static void
5156b1a1 730client_expect_confirm(int id, const char *request, int do_close)
a7213e65 731{
5156b1a1 732 struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
a7213e65 733
5156b1a1 734 cr->request_type = request;
735 cr->do_close = do_close;
a7213e65 736
5156b1a1 737 channel_register_status_confirm(id, client_status_confirm,
738 client_abandon_status_confirm, cr);
739}
a7213e65 740
5156b1a1 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);
a7213e65 752 return;
753 }
a7213e65 754
5156b1a1 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);
a7213e65 760}
761
762static void
763process_cmdline(void)
764{
765 void (*handler)(int);
766 char *s, *cmd, *cancel_host;
767 int delete = 0;
768 int local = 0;
769 u_short cancel_port;
770 Forward fwd;
771
e74dc197 772 bzero(&fwd, sizeof(fwd));
773 fwd.listen_host = fwd.connect_host = NULL;
774
a7213e65 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;
fa0f0f45 780 while (isspace(*s))
a7213e65 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:");
30460aeb 789 logit(" -L[bind_address:]port:host:hostport "
790 "Request local forward");
791 logit(" -R[bind_address:]port:host:hostport "
792 "Request remote forward");
793 logit(" -KR[bind_address:]port "
794 "Cancel remote forward");
a7213e65 795 if (!options.permit_local_command)
796 goto out;
30460aeb 797 logit(" !args "
798 "Execute local command");
a7213e65 799 goto out;
800 }
801
802 if (*s == '!' && options.permit_local_command) {
803 s++;
804 ssh_local_cmd(s);
805 goto out;
806 }
807
808 if (*s == 'K') {
809 delete = 1;
810 s++;
811 }
812 if (*s != 'L' && *s != 'R') {
813 logit("Invalid command.");
814 goto out;
815 }
816 if (*s == 'L')
817 local = 1;
818 if (local && delete) {
819 logit("Not supported.");
820 goto out;
821 }
822 if ((!local || delete) && !compat20) {
823 logit("Not supported for SSH protocol version 1.");
824 goto out;
825 }
826
fa0f0f45 827 while (isspace(*++s))
828 ;
a7213e65 829
830 if (delete) {
831 cancel_port = 0;
832 cancel_host = hpdelim(&s); /* may be NULL */
833 if (s != NULL) {
834 cancel_port = a2port(s);
835 cancel_host = cleanhostname(cancel_host);
836 } else {
837 cancel_port = a2port(cancel_host);
838 cancel_host = NULL;
839 }
840 if (cancel_port == 0) {
841 logit("Bad forwarding close port");
842 goto out;
843 }
844 channel_request_rforward_cancel(cancel_host, cancel_port);
845 } else {
846 if (!parse_forward(&fwd, s)) {
847 logit("Bad forwarding specification.");
848 goto out;
849 }
850 if (local) {
851 if (channel_setup_local_fwd_listener(fwd.listen_host,
852 fwd.listen_port, fwd.connect_host,
853 fwd.connect_port, options.gateway_ports,
854 options.hpn_disabled, options.hpn_buffer_size) < 0) {
855 logit("Port forwarding failed.");
856 goto out;
857 }
858 } else {
30460aeb 859 if (channel_request_remote_forwarding(fwd.listen_host,
a7213e65 860 fwd.listen_port, fwd.connect_host,
30460aeb 861 fwd.connect_port) < 0) {
862 logit("Port forwarding failed.");
863 goto out;
864 }
a7213e65 865 }
866
867 logit("Forwarding port.");
868 }
869
870out:
871 signal(SIGINT, handler);
872 enter_raw_mode();
873 if (cmd)
874 xfree(cmd);
e74dc197 875 if (fwd.listen_host != NULL)
876 xfree(fwd.listen_host);
877 if (fwd.connect_host != NULL)
878 xfree(fwd.connect_host);
a7213e65 879}
880
5156b1a1 881/*
882 * Process the characters one by one, call with c==NULL for proto1 case.
883 */
3c0ef626 884static int
5156b1a1 885process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
886 char *buf, int len)
3c0ef626 887{
888 char string[1024];
889 pid_t pid;
890 int bytes = 0;
891 u_int i;
892 u_char ch;
893 char *s;
5156b1a1 894 int *escape_pendingp, escape_char;
895 struct escape_filter_ctx *efc;
3c0ef626 896
5156b1a1 897 if (c == NULL) {
898 escape_pendingp = &escape_pending1;
899 escape_char = escape_char1;
900 } else {
901 if (c->filter_ctx == NULL)
902 return 0;
903 efc = (struct escape_filter_ctx *)c->filter_ctx;
904 escape_pendingp = &efc->escape_pending;
905 escape_char = efc->escape_char;
906 }
907
a7213e65 908 if (len <= 0)
909 return (0);
910
911 for (i = 0; i < (u_int)len; i++) {
3c0ef626 912 /* Get one character at a time. */
913 ch = buf[i];
914
5156b1a1 915 if (*escape_pendingp) {
3c0ef626 916 /* We have previously seen an escape character. */
917 /* Clear the flag now. */
5156b1a1 918 *escape_pendingp = 0;
3c0ef626 919
920 /* Process the escaped character. */
921 switch (ch) {
922 case '.':
923 /* Terminate the connection. */
5156b1a1 924 snprintf(string, sizeof string, "%c.\r\n",
925 escape_char);
3c0ef626 926 buffer_append(berr, string, strlen(string));
927
5156b1a1 928 if (c && c->ctl_fd != -1) {
929 chan_read_failed(c);
930 chan_write_failed(c);
931 return 0;
932 } else
933 quit_pending = 1;
3c0ef626 934 return -1;
935
936 case 'Z' - 64:
5156b1a1 937 /* XXX support this for mux clients */
938 if (c && c->ctl_fd != -1) {
939 noescape:
940 snprintf(string, sizeof string,
941 "%c%c escape not available to "
942 "multiplexed sessions\r\n",
943 escape_char, ch);
944 buffer_append(berr, string,
945 strlen(string));
946 continue;
947 }
948 /* Suspend the program. Inform the user */
949 snprintf(string, sizeof string,
950 "%c^Z [suspend ssh]\r\n", escape_char);
3c0ef626 951 buffer_append(berr, string, strlen(string));
952
953 /* Restore terminal modes and suspend. */
954 client_suspend_self(bin, bout, berr);
955
956 /* We have been continued. */
957 continue;
958
a7213e65 959 case 'B':
960 if (compat20) {
961 snprintf(string, sizeof string,
962 "%cB\r\n", escape_char);
963 buffer_append(berr, string,
964 strlen(string));
965 channel_request_start(session_ident,
966 "break", 0);
967 packet_put_int(1000);
968 packet_send();
969 }
970 continue;
971
3c0ef626 972 case 'R':
973 if (compat20) {
974 if (datafellows & SSH_BUG_NOREKEY)
5156b1a1 975 logit("Server does not "
976 "support re-keying");
3c0ef626 977 else
978 need_rekeying = 1;
979 }
980 continue;
981
982 case '&':
5156b1a1 983 if (c && c->ctl_fd != -1)
984 goto noescape;
3c0ef626 985 /*
5156b1a1 986 * Detach the program (continue to serve
987 * connections, but put in background and no
988 * more new connections).
3c0ef626 989 */
990 /* Restore tty modes. */
991 leave_raw_mode();
992
993 /* Stop listening for new connections. */
994 channel_stop_listening();
995
996 snprintf(string, sizeof string,
997 "%c& [backgrounded]\n", escape_char);
998 buffer_append(berr, string, strlen(string));
999
1000 /* Fork into background. */
1001 pid = fork();
1002 if (pid < 0) {
1003 error("fork: %.100s", strerror(errno));
1004 continue;
1005 }
1006 if (pid != 0) { /* This is the parent. */
1007 /* The parent just exits. */
1008 exit(0);
1009 }
1010 /* The child continues serving connections. */
1011 if (compat20) {
1012 buffer_append(bin, "\004", 1);
1013 /* fake EOF on stdin */
1014 return -1;
1015 } else if (!stdin_eof) {
1016 /*
5156b1a1 1017 * Sending SSH_CMSG_EOF alone does not
1018 * always appear to be enough. So we
1019 * try to send an EOF character first.
3c0ef626 1020 */
1021 packet_start(SSH_CMSG_STDIN_DATA);
1022 packet_put_string("\004", 1);
1023 packet_send();
1024 /* Close stdin. */
1025 stdin_eof = 1;
1026 if (buffer_len(bin) == 0) {
1027 packet_start(SSH_CMSG_EOF);
1028 packet_send();
1029 }
1030 }
1031 continue;
1032
1033 case '?':
5156b1a1 1034 if (c && c->ctl_fd != -1) {
1035 snprintf(string, sizeof string,
3c0ef626 1036"%c?\r\n\
1037Supported escape sequences:\r\n\
5156b1a1 1038 %c. - terminate session\r\n\
1039 %cB - send a BREAK to the remote system\r\n\
1040 %cC - open a command line\r\n\
1041 %cR - Request rekey (SSH protocol 2 only)\r\n\
1042 %c# - list forwarded connections\r\n\
1043 %c? - this message\r\n\
1044 %c%c - send the escape character by typing it twice\r\n\
3c0ef626 1045(Note that escapes are only recognized immediately after newline.)\r\n",
5156b1a1 1046 escape_char, escape_char,
1047 escape_char, escape_char,
1048 escape_char, escape_char,
1049 escape_char, escape_char,
1050 escape_char);
1051 } else {
1052 snprintf(string, sizeof string,
1053"%c?\r\n\
1054Supported escape sequences:\r\n\
1055 %c. - terminate connection (and any multiplexed sessions)\r\n\
1056 %cB - send a BREAK to the remote system\r\n\
1057 %cC - open a command line\r\n\
1058 %cR - Request rekey (SSH protocol 2 only)\r\n\
1059 %c^Z - suspend ssh\r\n\
1060 %c# - list forwarded connections\r\n\
1061 %c& - background ssh (when waiting for connections to terminate)\r\n\
1062 %c? - this message\r\n\
1063 %c%c - send the escape character by typing it twice\r\n\
1064(Note that escapes are only recognized immediately after newline.)\r\n",
1065 escape_char, escape_char,
1066 escape_char, escape_char,
1067 escape_char, escape_char,
1068 escape_char, escape_char,
1069 escape_char, escape_char,
1070 escape_char);
1071 }
3c0ef626 1072 buffer_append(berr, string, strlen(string));
1073 continue;
1074
1075 case '#':
5156b1a1 1076 snprintf(string, sizeof string, "%c#\r\n",
1077 escape_char);
3c0ef626 1078 buffer_append(berr, string, strlen(string));
1079 s = channel_open_message();
1080 buffer_append(berr, s, strlen(s));
1081 xfree(s);
1082 continue;
1083
a7213e65 1084 case 'C':
1085 process_cmdline();
1086 continue;
1087
3c0ef626 1088 default:
1089 if (ch != escape_char) {
1090 buffer_put_char(bin, escape_char);
1091 bytes++;
1092 }
1093 /* Escaped characters fall through here */
1094 break;
1095 }
1096 } else {
1097 /*
5156b1a1 1098 * The previous character was not an escape char.
1099 * Check if this is an escape.
3c0ef626 1100 */
1101 if (last_was_cr && ch == escape_char) {
5156b1a1 1102 /*
1103 * It is. Set the flag and continue to
1104 * next character.
1105 */
1106 *escape_pendingp = 1;
3c0ef626 1107 continue;
1108 }
1109 }
1110
1111 /*
1112 * Normal character. Record whether it was a newline,
1113 * and append it to the buffer.
1114 */
1115 last_was_cr = (ch == '\r' || ch == '\n');
1116 buffer_put_char(bin, ch);
1117 bytes++;
1118 }
1119 return bytes;
1120}
1121
1122static void
30460aeb 1123client_process_input(fd_set *readset)
3c0ef626 1124{
1125 int len;
1126 char buf[8192];
1127
1128 /* Read input from stdin. */
1129 if (FD_ISSET(fileno(stdin), readset)) {
1130 /* Read as much as possible. */
1131 len = read(fileno(stdin), buf, sizeof(buf));
5156b1a1 1132 if (len < 0 &&
1133 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
3c0ef626 1134 return; /* we'll try again later */
1135 if (len <= 0) {
1136 /*
1137 * Received EOF or error. They are treated
1138 * similarly, except that an error message is printed
1139 * if it was an error condition.
1140 */
1141 if (len < 0) {
5156b1a1 1142 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1143 strerror(errno));
3c0ef626 1144 buffer_append(&stderr_buffer, buf, strlen(buf));
1145 }
1146 /* Mark that we have seen EOF. */
1147 stdin_eof = 1;
1148 /*
1149 * Send an EOF message to the server unless there is
1150 * data in the buffer. If there is data in the
1151 * buffer, no message will be sent now. Code
1152 * elsewhere will send the EOF when the buffer
1153 * becomes empty if stdin_eof is set.
1154 */
1155 if (buffer_len(&stdin_buffer) == 0) {
1156 packet_start(SSH_CMSG_EOF);
1157 packet_send();
1158 }
5156b1a1 1159 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
3c0ef626 1160 /*
1161 * Normal successful read, and no escape character.
1162 * Just append the data to buffer.
1163 */
1164 buffer_append(&stdin_buffer, buf, len);
1165 } else {
1166 /*
5156b1a1 1167 * Normal, successful read. But we have an escape
1168 * character and have to process the characters one
1169 * by one.
3c0ef626 1170 */
5156b1a1 1171 if (process_escapes(NULL, &stdin_buffer,
1172 &stdout_buffer, &stderr_buffer, buf, len) == -1)
3c0ef626 1173 return;
1174 }
1175 }
1176}
1177
1178static void
30460aeb 1179client_process_output(fd_set *writeset)
3c0ef626 1180{
1181 int len;
1182 char buf[100];
1183
1184 /* Write buffered output to stdout. */
1185 if (FD_ISSET(fileno(stdout), writeset)) {
1186 /* Write as much data as possible. */
1187 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1188 buffer_len(&stdout_buffer));
1189 if (len <= 0) {
5156b1a1 1190 if (errno == EINTR || errno == EAGAIN ||
1191 errno == EWOULDBLOCK)
3c0ef626 1192 len = 0;
1193 else {
1194 /*
1195 * An error or EOF was encountered. Put an
1196 * error message to stderr buffer.
1197 */
5156b1a1 1198 snprintf(buf, sizeof buf,
1199 "write stdout: %.50s\r\n", strerror(errno));
3c0ef626 1200 buffer_append(&stderr_buffer, buf, strlen(buf));
1201 quit_pending = 1;
1202 return;
1203 }
1204 }
1205 /* Consume printed data from the buffer. */
1206 buffer_consume(&stdout_buffer, len);
3c0ef626 1207 }
1208 /* Write buffered output to stderr. */
1209 if (FD_ISSET(fileno(stderr), writeset)) {
1210 /* Write as much data as possible. */
1211 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1212 buffer_len(&stderr_buffer));
1213 if (len <= 0) {
5156b1a1 1214 if (errno == EINTR || errno == EAGAIN ||
1215 errno == EWOULDBLOCK)
3c0ef626 1216 len = 0;
1217 else {
5156b1a1 1218 /*
1219 * EOF or error, but can't even print
1220 * error message.
1221 */
3c0ef626 1222 quit_pending = 1;
1223 return;
1224 }
1225 }
1226 /* Consume printed characters from the buffer. */
1227 buffer_consume(&stderr_buffer, len);
3c0ef626 1228 }
1229}
1230
1231/*
1232 * Get packets from the connection input buffer, and process them as long as
1233 * there are packets available.
1234 *
1235 * Any unknown packets received during the actual
1236 * session cause the session to terminate. This is
1237 * intended to make debugging easier since no
1238 * confirmations are sent. Any compatible protocol
1239 * extensions must be negotiated during the
1240 * preparatory phase.
1241 */
1242
1243static void
1244client_process_buffered_input_packets(void)
1245{
5156b1a1 1246 dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1247 compat20 ? xxx_kex : NULL);
3c0ef626 1248}
1249
1250/* scan buf[] for '~' before sending data to the peer */
1251
5156b1a1 1252/* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1253void *
1254client_new_escape_filter_ctx(int escape_char)
1255{
1256 struct escape_filter_ctx *ret;
1257
1258 ret = xmalloc(sizeof(*ret));
1259 ret->escape_pending = 0;
1260 ret->escape_char = escape_char;
1261 return (void *)ret;
1262}
1263
1264/* Free the escape filter context on channel free */
1265void
1266client_filter_cleanup(int cid, void *ctx)
3c0ef626 1267{
5156b1a1 1268 xfree(ctx);
1269}
1270
1271int
1272client_simple_escape_filter(Channel *c, char *buf, int len)
1273{
1274 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1275 return 0;
1276
1277 return process_escapes(c, &c->input, &c->output, &c->extended,
1278 buf, len);
3c0ef626 1279}
1280
1281static void
1282client_channel_closed(int id, void *arg)
1283{
3c0ef626 1284 channel_cancel_cleanup(id);
1285 session_closed = 1;
a7213e65 1286 leave_raw_mode();
3c0ef626 1287}
1288
1289/*
1290 * Implements the interactive session with the server. This is called after
1291 * the user has been authenticated, and a command has been started on the
1292 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1293 * used as an escape character for terminating or suspending the session.
1294 */
1295
1296int
1297client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1298{
1299 fd_set *readset = NULL, *writeset = NULL;
1300 double start_time, total_time;
a7213e65 1301 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
5156b1a1 1302 u_int64_t ibytes, obytes;
a7213e65 1303 u_int nalloc = 0;
3c0ef626 1304 char buf[100];
1305
1306 debug("Entering interactive session.");
1307
1308 start_time = get_current_time();
1309
1310 /* Initialize variables. */
5156b1a1 1311 escape_pending1 = 0;
3c0ef626 1312 last_was_cr = 1;
1313 exit_status = -1;
1314 stdin_eof = 0;
1315 buffer_high = 64 * 1024;
1316 connection_in = packet_get_connection_in();
1317 connection_out = packet_get_connection_out();
1318 max_fd = MAX(connection_in, connection_out);
5156b1a1 1319 if (muxserver_sock != -1)
1320 max_fd = MAX(max_fd, muxserver_sock);
3c0ef626 1321
1322 if (!compat20) {
1323 /* enable nonblocking unless tty */
1324 if (!isatty(fileno(stdin)))
1325 set_nonblock(fileno(stdin));
1326 if (!isatty(fileno(stdout)))
1327 set_nonblock(fileno(stdout));
1328 if (!isatty(fileno(stderr)))
1329 set_nonblock(fileno(stderr));
1330 max_fd = MAX(max_fd, fileno(stdin));
1331 max_fd = MAX(max_fd, fileno(stdout));
1332 max_fd = MAX(max_fd, fileno(stderr));
1333 }
3c0ef626 1334 quit_pending = 0;
5156b1a1 1335 escape_char1 = escape_char_arg;
3c0ef626 1336
1337 /* Initialize buffers. */
1338 buffer_init(&stdin_buffer);
1339 buffer_init(&stdout_buffer);
1340 buffer_init(&stderr_buffer);
1341
1342 client_init_dispatch();
1343
a7213e65 1344 /*
1345 * Set signal handlers, (e.g. to restore non-blocking mode)
1346 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1347 */
1348 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1349 signal(SIGHUP, signal_handler);
1350 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1351 signal(SIGINT, signal_handler);
1352 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1353 signal(SIGQUIT, signal_handler);
1354 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1355 signal(SIGTERM, signal_handler);
1356 signal(SIGWINCH, window_change_handler);
3c0ef626 1357
1358 if (have_pty)
1359 enter_raw_mode();
1360
1361 if (compat20) {
1362 session_ident = ssh2_chan_id;
5156b1a1 1363 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
3c0ef626 1364 channel_register_filter(session_ident,
5156b1a1 1365 client_simple_escape_filter, NULL,
1366 client_filter_cleanup,
1367 client_new_escape_filter_ctx(escape_char_arg));
3c0ef626 1368 if (session_ident != -1)
1369 channel_register_cleanup(session_ident,
a7213e65 1370 client_channel_closed, 0);
3c0ef626 1371 } else {
1372 /* Check if we should immediately send eof on stdin. */
1373 client_check_initial_eof_on_stdin();
1374 }
1375
1376 /* Main loop of the client for the interactive session mode. */
1377 while (!quit_pending) {
1378
1379 /* Process buffered packets sent by the server. */
1380 client_process_buffered_input_packets();
1381
1382 if (compat20 && session_closed && !channel_still_open())
1383 break;
1384
1385 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1386
1387 if (rekeying) {
1388 debug("rekeying in progress");
1389 } else {
1390 /*
1391 * Make packets of buffered stdin data, and buffer
1392 * them for sending to the server.
1393 */
1394 if (!compat20)
1395 client_make_packets_from_stdin_data();
1396
1397 /*
1398 * Make packets from buffered channel data, and
1399 * enqueue them for sending to the server.
1400 */
1401 if (packet_not_very_much_data_to_write())
1402 channel_output_poll();
1403
1404 /*
1405 * Check if the window size has changed, and buffer a
1406 * message about it to the server if so.
1407 */
1408 client_check_window_change();
1409
1410 if (quit_pending)
1411 break;
1412 }
1413 /*
1414 * Wait until we have something to do (something becomes
1415 * available on one of the descriptors).
1416 */
1417 max_fd2 = max_fd;
1418 client_wait_until_can_do_something(&readset, &writeset,
1419 &max_fd2, &nalloc, rekeying);
1420
1421 if (quit_pending)
1422 break;
1423
1424 /* Do channel operations unless rekeying in progress. */
1425 if (!rekeying) {
1426 channel_after_select(readset, writeset);
a7213e65 1427 if (need_rekeying || packet_need_rekeying()) {
1428 debug("need rekeying");
3c0ef626 1429 xxx_kex->done = 0;
1430 kex_send_kexinit(xxx_kex);
1431 need_rekeying = 0;
1432 }
1433 }
1434
1435 /* Buffer input from the connection. */
1436 client_process_net_input(readset);
1437
a7213e65 1438 /* Accept control connections. */
5156b1a1 1439 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1440 if (muxserver_accept_control())
1441 quit_pending = 1;
1442 }
a7213e65 1443
3c0ef626 1444 if (quit_pending)
1445 break;
1446
1447 if (!compat20) {
1448 /* Buffer data from stdin */
1449 client_process_input(readset);
1450 /*
1451 * Process output to stdout and stderr. Output to
1452 * the connection is processed elsewhere (above).
1453 */
1454 client_process_output(writeset);
1455 }
1456
5156b1a1 1457 /*
1458 * Send as much buffered packet data as possible to the
1459 * sender.
1460 */
3c0ef626 1461 if (FD_ISSET(connection_out, writeset))
1462 packet_write_poll();
1463 }
1464 if (readset)
1465 xfree(readset);
1466 if (writeset)
1467 xfree(writeset);
1468
1469 /* Terminate the session. */
1470
1471 /* Stop watching for window change. */
a7213e65 1472 signal(SIGWINCH, SIG_DFL);
3c0ef626 1473
1474 channel_free_all();
1475
1476 if (have_pty)
1477 leave_raw_mode();
1478
1479 /* restore blocking io */
1480 if (!isatty(fileno(stdin)))
1481 unset_nonblock(fileno(stdin));
1482 if (!isatty(fileno(stdout)))
1483 unset_nonblock(fileno(stdout));
1484 if (!isatty(fileno(stderr)))
1485 unset_nonblock(fileno(stderr));
1486
a7213e65 1487 /*
1488 * If there was no shell or command requested, there will be no remote
1489 * exit status to be returned. In that case, clear error code if the
1490 * connection was deliberately terminated at this end.
1491 */
1492 if (no_shell_flag && received_signal == SIGTERM) {
1493 received_signal = 0;
1494 exit_status = 0;
3c0ef626 1495 }
1496
a7213e65 1497 if (received_signal)
1498 fatal("Killed by signal %d.", (int) received_signal);
1499
3c0ef626 1500 /*
1501 * In interactive mode (with pseudo tty) display a message indicating
1502 * that the connection has been closed.
1503 */
1504 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
5156b1a1 1505 snprintf(buf, sizeof buf,
1506 "Connection to %.64s closed.\r\n", host);
3c0ef626 1507 buffer_append(&stderr_buffer, buf, strlen(buf));
1508 }
1509
1510 /* Output any buffered data for stdout. */
1511 while (buffer_len(&stdout_buffer) > 0) {
1512 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1513 buffer_len(&stdout_buffer));
1514 if (len <= 0) {
1515 error("Write failed flushing stdout buffer.");
1516 break;
1517 }
1518 buffer_consume(&stdout_buffer, len);
3c0ef626 1519 }
1520
1521 /* Output any buffered data for stderr. */
1522 while (buffer_len(&stderr_buffer) > 0) {
1523 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1524 buffer_len(&stderr_buffer));
1525 if (len <= 0) {
1526 error("Write failed flushing stderr buffer.");
1527 break;
1528 }
1529 buffer_consume(&stderr_buffer, len);
3c0ef626 1530 }
1531
1532 /* Clear and free any buffers. */
1533 memset(buf, 0, sizeof(buf));
1534 buffer_free(&stdin_buffer);
1535 buffer_free(&stdout_buffer);
1536 buffer_free(&stderr_buffer);
1537
1538 /* Report bytes transferred, and transfer rates. */
1539 total_time = get_current_time() - start_time;
5156b1a1 1540 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1541 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1542 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1543 obytes, ibytes, total_time);
3c0ef626 1544 if (total_time > 0)
5156b1a1 1545 verbose("Bytes per second: sent %.1f, received %.1f",
1546 obytes / total_time, ibytes / total_time);
3c0ef626 1547 /* Return the exit status of the program. */
1548 debug("Exit status %d", exit_status);
1549 return exit_status;
1550}
1551
1552/*********/
1553
1554static void
a7213e65 1555client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
3c0ef626 1556{
1557 u_int data_len;
1558 char *data = packet_get_string(&data_len);
a7213e65 1559 packet_check_eom();
3c0ef626 1560 buffer_append(&stdout_buffer, data, data_len);
1561 memset(data, 0, data_len);
1562 xfree(data);
1563}
1564static void
a7213e65 1565client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
3c0ef626 1566{
1567 u_int data_len;
1568 char *data = packet_get_string(&data_len);
a7213e65 1569 packet_check_eom();
3c0ef626 1570 buffer_append(&stderr_buffer, data, data_len);
1571 memset(data, 0, data_len);
1572 xfree(data);
1573}
1574static void
a7213e65 1575client_input_exit_status(int type, u_int32_t seq, void *ctxt)
3c0ef626 1576{
3c0ef626 1577 exit_status = packet_get_int();
a7213e65 1578 packet_check_eom();
3c0ef626 1579 /* Acknowledge the exit. */
1580 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1581 packet_send();
1582 /*
1583 * Must wait for packet to be sent since we are
1584 * exiting the loop.
1585 */
1586 packet_write_wait();
1587 /* Flag that we want to exit. */
1588 quit_pending = 1;
1589}
a7213e65 1590static void
1591client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1592{
1593 Channel *c = NULL;
1594 int remote_id, sock;
1595
1596 /* Read the remote channel number from the message. */
1597 remote_id = packet_get_int();
1598 packet_check_eom();
1599
1600 /*
1601 * Get a connection to the local authentication agent (this may again
1602 * get forwarded).
1603 */
1604 sock = ssh_get_authentication_socket();
1605
1606 /*
1607 * If we could not connect the agent, send an error message back to
1608 * the server. This should never happen unless the agent dies,
1609 * because authentication forwarding is only enabled if we have an
1610 * agent.
1611 */
1612 if (sock >= 0) {
1613 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1614 -1, 0, 0, 0, "authentication agent connection", 1);
1615 c->remote_id = remote_id;
1616 c->force_drain = 1;
1617 }
1618 if (c == NULL) {
1619 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1620 packet_put_int(remote_id);
1621 } else {
1622 /* Send a confirmation to the remote host. */
1623 debug("Forwarding authentication connection.");
1624 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1625 packet_put_int(remote_id);
1626 packet_put_int(c->self);
1627 }
1628 packet_send();
1629}
3c0ef626 1630
1631static Channel *
1632client_request_forwarded_tcpip(const char *request_type, int rchan)
1633{
a7213e65 1634 Channel *c = NULL;
3c0ef626 1635 char *listen_address, *originator_address;
1636 int listen_port, originator_port;
3c0ef626 1637
1638 /* Get rest of the packet */
1639 listen_address = packet_get_string(NULL);
1640 listen_port = packet_get_int();
1641 originator_address = packet_get_string(NULL);
1642 originator_port = packet_get_int();
a7213e65 1643 packet_check_eom();
3c0ef626 1644
5156b1a1 1645 debug("client_request_forwarded_tcpip: listen %s port %d, "
1646 "originator %s port %d", listen_address, listen_port,
1647 originator_address, originator_port);
1648
1649 c = channel_connect_by_listen_address(listen_port,
1650 "forwarded-tcpip", originator_address);
3c0ef626 1651
3c0ef626 1652 xfree(originator_address);
1653 xfree(listen_address);
1654 return c;
1655}
1656
a7213e65 1657static Channel *
3c0ef626 1658client_request_x11(const char *request_type, int rchan)
1659{
1660 Channel *c = NULL;
1661 char *originator;
1662 int originator_port;
1663 int sock;
1664
1665 if (!options.forward_x11) {
1666 error("Warning: ssh server tried X11 forwarding.");
5156b1a1 1667 error("Warning: this is probably a break-in attempt by a "
1668 "malicious server.");
3c0ef626 1669 return NULL;
1670 }
1671 originator = packet_get_string(NULL);
1672 if (datafellows & SSH_BUG_X11FWD) {
1673 debug2("buggy server: x11 request w/o originator_port");
1674 originator_port = 0;
1675 } else {
1676 originator_port = packet_get_int();
1677 }
a7213e65 1678 packet_check_eom();
3c0ef626 1679 /* XXX check permission */
1680 debug("client_request_x11: request from %s %d", originator,
1681 originator_port);
1682 xfree(originator);
1683 sock = x11_connect_display();
1684 if (sock < 0)
1685 return NULL;
6df46d40 1686 /* again is this really necessary for X11? */
a7213e65 1687 if (options.hpn_disabled)
6df46d40 1688 c = channel_new("x11",
1689 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1690 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
a7213e65 1691 else
1692 c = channel_new("x11",
1693 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1694 options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
3c0ef626 1695 c->force_drain = 1;
1696 return c;
1697}
1698
a7213e65 1699static Channel *
3c0ef626 1700client_request_agent(const char *request_type, int rchan)
1701{
1702 Channel *c = NULL;
1703 int sock;
1704
1705 if (!options.forward_agent) {
1706 error("Warning: ssh server tried agent forwarding.");
5156b1a1 1707 error("Warning: this is probably a break-in attempt by a "
1708 "malicious server.");
3c0ef626 1709 return NULL;
1710 }
0b90ac93 1711 sock = ssh_get_authentication_socket();
3c0ef626 1712 if (sock < 0)
1713 return NULL;
6df46d40 1714 /* not sure this is really needed here either */
a7213e65 1715 if (options.hpn_disabled)
6df46d40 1716 c = channel_new("authentication agent connection",
1717 SSH_CHANNEL_OPEN, sock, sock, -1,
e74dc197 1718 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
6df46d40 1719 "authentication agent connection", 1);
a7213e65 1720 else
1721 c = channel_new("authentication agent connection",
1722 SSH_CHANNEL_OPEN, sock, sock, -1,
1723 options.hpn_buffer_size, options.hpn_buffer_size, 0,
1724 "authentication agent connection", 1);
3c0ef626 1725 c->force_drain = 1;
1726 return c;
1727}
1728
fa0f0f45 1729int
1730client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1731{
1732 Channel *c;
1733 int fd;
1734
1735 if (tun_mode == SSH_TUNMODE_NO)
1736 return 0;
1737
1738 if (!compat20) {
1739 error("Tunnel forwarding is not support for protocol 1");
1740 return -1;
1741 }
1742
1743 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1744
1745 /* Open local tunnel device */
1746 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1747 error("Tunnel device open failed.");
1748 return -1;
1749 }
1750
4834571d 1751 if(options.hpn_disabled)
6df46d40 1752 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
4834571d 1753 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1754 0, "tun", 1);
1755 else
6df46d40 1756 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
4834571d 1757 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1758 0, "tun", 1);
fa0f0f45 1759 c->datagram = 1;
1760
1761#if defined(SSH_TUN_FILTER)
1762 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1763 channel_register_filter(c->self, sys_tun_infilter,
5156b1a1 1764 sys_tun_outfilter, NULL, NULL);
fa0f0f45 1765#endif
1766
1767 packet_start(SSH2_MSG_CHANNEL_OPEN);
1768 packet_put_cstring("tun@openssh.com");
1769 packet_put_int(c->self);
1770 packet_put_int(c->local_window_max);
1771 packet_put_int(c->local_maxpacket);
1772 packet_put_int(tun_mode);
1773 packet_put_int(remote_tun);
1774 packet_send();
1775
1776 return 0;
1777}
1778
3c0ef626 1779/* XXXX move to generic input handler */
1780static void
a7213e65 1781client_input_channel_open(int type, u_int32_t seq, void *ctxt)
3c0ef626 1782{
1783 Channel *c = NULL;
1784 char *ctype;
3c0ef626 1785 int rchan;
a7213e65 1786 u_int rmaxpack, rwindow, len;
3c0ef626 1787
1788 ctype = packet_get_string(&len);
1789 rchan = packet_get_int();
1790 rwindow = packet_get_int();
1791 rmaxpack = packet_get_int();
1792
1793 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1794 ctype, rchan, rwindow, rmaxpack);
1795
1796 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1797 c = client_request_forwarded_tcpip(ctype, rchan);
1798 } else if (strcmp(ctype, "x11") == 0) {
1799 c = client_request_x11(ctype, rchan);
1800 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1801 c = client_request_agent(ctype, rchan);
1802 }
1803/* XXX duplicate : */
1804 if (c != NULL) {
1805 debug("confirm %s", ctype);
1806 c->remote_id = rchan;
1807 c->remote_window = rwindow;
1808 c->remote_maxpacket = rmaxpack;
1809 if (c->type != SSH_CHANNEL_CONNECTING) {
1810 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1811 packet_put_int(c->remote_id);
1812 packet_put_int(c->self);
1813 packet_put_int(c->local_window);
1814 packet_put_int(c->local_maxpacket);
1815 packet_send();
1816 }
1817 } else {
1818 debug("failure %s", ctype);
1819 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1820 packet_put_int(rchan);
1821 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1822 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1823 packet_put_cstring("open failed");
1824 packet_put_cstring("");
1825 }
1826 packet_send();
1827 }
1828 xfree(ctype);
1829}
1830static void
a7213e65 1831client_input_channel_req(int type, u_int32_t seq, void *ctxt)
3c0ef626 1832{
1833 Channel *c = NULL;
a7213e65 1834 int exitval, id, reply, success = 0;
3c0ef626 1835 char *rtype;
1836
1837 id = packet_get_int();
1838 rtype = packet_get_string(NULL);
1839 reply = packet_get_char();
1840
1841 debug("client_input_channel_req: channel %d rtype %s reply %d",
1842 id, rtype, reply);
1843
a7213e65 1844 if (id == -1) {
1845 error("client_input_channel_req: request for channel -1");
1846 } else if ((c = channel_lookup(id)) == NULL) {
5156b1a1 1847 error("client_input_channel_req: channel %d: "
1848 "unknown channel", id);
1849 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1850 packet_check_eom();
1851 chan_rcvd_eow(c);
3c0ef626 1852 } else if (strcmp(rtype, "exit-status") == 0) {
a7213e65 1853 exitval = packet_get_int();
1854 if (id == session_ident) {
1855 success = 1;
1856 exit_status = exitval;
1857 } else if (c->ctl_fd == -1) {
1858 error("client_input_channel_req: unexpected channel %d",
1859 session_ident);
1860 } else {
1861 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1862 success = 1;
1863 }
1864 packet_check_eom();
3c0ef626 1865 }
1866 if (reply) {
1867 packet_start(success ?
1868 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
a7213e65 1869 packet_put_int(id);
3c0ef626 1870 packet_send();
1871 }
1872 xfree(rtype);
1873}
a7213e65 1874static void
1875client_input_global_request(int type, u_int32_t seq, void *ctxt)
1876{
1877 char *rtype;
1878 int want_reply;
1879 int success = 0;
1880
1881 rtype = packet_get_string(NULL);
1882 want_reply = packet_get_char();
1883 debug("client_input_global_request: rtype %s want_reply %d",
1884 rtype, want_reply);
1885 if (want_reply) {
1886 packet_start(success ?
1887 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1888 packet_send();
1889 packet_write_wait();
1890 }
1891 xfree(rtype);
1892}
1893
1894void
1895client_session2_setup(int id, int want_tty, int want_subsystem,
5156b1a1 1896 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
a7213e65 1897{
1898 int len;
1899 Channel *c = NULL;
1900
1901 debug2("%s: id %d", __func__, id);
1902
1903 if ((c = channel_lookup(id)) == NULL)
1904 fatal("client_session2_setup: channel %d: unknown channel", id);
1905
1906 if (want_tty) {
1907 struct winsize ws;
a7213e65 1908
1909 /* Store window size in the packet. */
1910 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1911 memset(&ws, 0, sizeof(ws));
1912
5156b1a1 1913 channel_request_start(id, "pty-req", 1);
1914 client_expect_confirm(id, "PTY allocation", 0);
a7213e65 1915 packet_put_cstring(term != NULL ? term : "");
30460aeb 1916 packet_put_int((u_int)ws.ws_col);
1917 packet_put_int((u_int)ws.ws_row);
1918 packet_put_int((u_int)ws.ws_xpixel);
1919 packet_put_int((u_int)ws.ws_ypixel);
5156b1a1 1920 if (tiop == NULL)
1921 tiop = get_saved_tio();
1922 tty_make_modes(-1, tiop);
a7213e65 1923 packet_send();
1924 /* XXX wait for reply */
1925 c->client_tty = 1;
1926 }
1927
1928 /* Transfer any environment variables from client to server */
1929 if (options.num_send_env != 0 && env != NULL) {
1930 int i, j, matched;
1931 char *name, *val;
1932
1933 debug("Sending environment.");
1934 for (i = 0; env[i] != NULL; i++) {
1935 /* Split */
1936 name = xstrdup(env[i]);
1937 if ((val = strchr(name, '=')) == NULL) {
1938 xfree(name);
1939 continue;
1940 }
1941 *val++ = '\0';
1942
1943 matched = 0;
1944 for (j = 0; j < options.num_send_env; j++) {
1945 if (match_pattern(name, options.send_env[j])) {
1946 matched = 1;
1947 break;
1948 }
1949 }
1950 if (!matched) {
1951 debug3("Ignored env %s", name);
1952 xfree(name);
1953 continue;
1954 }
1955
1956 debug("Sending env %s = %s", name, val);
1957 channel_request_start(id, "env", 0);
1958 packet_put_cstring(name);
1959 packet_put_cstring(val);
1960 packet_send();
1961 xfree(name);
1962 }
1963 }
1964
1965 len = buffer_len(cmd);
1966 if (len > 0) {
1967 if (len > 900)
1968 len = 900;
1969 if (want_subsystem) {
5156b1a1 1970 debug("Sending subsystem: %.*s",
1971 len, (u_char*)buffer_ptr(cmd));
1972 channel_request_start(id, "subsystem", 1);
1973 client_expect_confirm(id, "subsystem", 1);
a7213e65 1974 } else {
5156b1a1 1975 debug("Sending command: %.*s",
1976 len, (u_char*)buffer_ptr(cmd));
1977 channel_request_start(id, "exec", 1);
1978 client_expect_confirm(id, "exec", 1);
a7213e65 1979 }
1980 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1981 packet_send();
1982 } else {
5156b1a1 1983 channel_request_start(id, "shell", 1);
1984 client_expect_confirm(id, "shell", 1);
a7213e65 1985 packet_send();
1986 }
1987}
3c0ef626 1988
1989static void
1990client_init_dispatch_20(void)
1991{
1992 dispatch_init(&dispatch_protocol_error);
a7213e65 1993
3c0ef626 1994 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1995 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1996 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1997 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1998 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1999 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2000 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2001 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2002 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
5156b1a1 2003 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2004 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
a7213e65 2005 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
3c0ef626 2006
2007 /* rekeying */
2008 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
a7213e65 2009
2010 /* global request reply messages */
2011 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2012 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
3c0ef626 2013}
5156b1a1 2014
3c0ef626 2015static void
2016client_init_dispatch_13(void)
2017{
2018 dispatch_init(NULL);
2019 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2020 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2021 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2022 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2023 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2024 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2025 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2026 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2027 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2028
2029 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
a7213e65 2030 &client_input_agent_open : &deny_input_open);
3c0ef626 2031 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2032 &x11_input_open : &deny_input_open);
2033}
5156b1a1 2034
3c0ef626 2035static void
2036client_init_dispatch_15(void)
2037{
2038 client_init_dispatch_13();
2039 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2040 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2041}
5156b1a1 2042
3c0ef626 2043static void
2044client_init_dispatch(void)
2045{
2046 if (compat20)
2047 client_init_dispatch_20();
2048 else if (compat13)
2049 client_init_dispatch_13();
2050 else
2051 client_init_dispatch_15();
2052}
a7213e65 2053
2054/* client specific fatal cleanup */
2055void
2056cleanup_exit(int i)
2057{
2058 leave_raw_mode();
2059 leave_non_blocking();
5156b1a1 2060 if (options.control_path != NULL && muxserver_sock != -1)
a7213e65 2061 unlink(options.control_path);
2062 _exit(i);
2063}
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