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Merged hpn13v5 to trunk.
[gssapi-openssh.git] / openssh / clientloop.c
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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,
d3057ca4 853 fwd.connect_port, options.gateway_ports) < 0) {
a7213e65 854 logit("Port forwarding failed.");
855 goto out;
856 }
857 } else {
30460aeb 858 if (channel_request_remote_forwarding(fwd.listen_host,
a7213e65 859 fwd.listen_port, fwd.connect_host,
30460aeb 860 fwd.connect_port) < 0) {
861 logit("Port forwarding failed.");
862 goto out;
863 }
a7213e65 864 }
865
866 logit("Forwarding port.");
867 }
868
869out:
870 signal(SIGINT, handler);
871 enter_raw_mode();
872 if (cmd)
873 xfree(cmd);
e74dc197 874 if (fwd.listen_host != NULL)
875 xfree(fwd.listen_host);
876 if (fwd.connect_host != NULL)
877 xfree(fwd.connect_host);
a7213e65 878}
879
5156b1a1 880/*
881 * Process the characters one by one, call with c==NULL for proto1 case.
882 */
3c0ef626 883static int
5156b1a1 884process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
885 char *buf, int len)
3c0ef626 886{
887 char string[1024];
888 pid_t pid;
889 int bytes = 0;
890 u_int i;
891 u_char ch;
892 char *s;
5156b1a1 893 int *escape_pendingp, escape_char;
894 struct escape_filter_ctx *efc;
3c0ef626 895
5156b1a1 896 if (c == NULL) {
897 escape_pendingp = &escape_pending1;
898 escape_char = escape_char1;
899 } else {
900 if (c->filter_ctx == NULL)
901 return 0;
902 efc = (struct escape_filter_ctx *)c->filter_ctx;
903 escape_pendingp = &efc->escape_pending;
904 escape_char = efc->escape_char;
905 }
906
a7213e65 907 if (len <= 0)
908 return (0);
909
910 for (i = 0; i < (u_int)len; i++) {
3c0ef626 911 /* Get one character at a time. */
912 ch = buf[i];
913
5156b1a1 914 if (*escape_pendingp) {
3c0ef626 915 /* We have previously seen an escape character. */
916 /* Clear the flag now. */
5156b1a1 917 *escape_pendingp = 0;
3c0ef626 918
919 /* Process the escaped character. */
920 switch (ch) {
921 case '.':
922 /* Terminate the connection. */
5156b1a1 923 snprintf(string, sizeof string, "%c.\r\n",
924 escape_char);
3c0ef626 925 buffer_append(berr, string, strlen(string));
926
5156b1a1 927 if (c && c->ctl_fd != -1) {
928 chan_read_failed(c);
929 chan_write_failed(c);
930 return 0;
931 } else
932 quit_pending = 1;
3c0ef626 933 return -1;
934
935 case 'Z' - 64:
5156b1a1 936 /* XXX support this for mux clients */
937 if (c && c->ctl_fd != -1) {
938 noescape:
939 snprintf(string, sizeof string,
940 "%c%c escape not available to "
941 "multiplexed sessions\r\n",
942 escape_char, ch);
943 buffer_append(berr, string,
944 strlen(string));
945 continue;
946 }
947 /* Suspend the program. Inform the user */
948 snprintf(string, sizeof string,
949 "%c^Z [suspend ssh]\r\n", escape_char);
3c0ef626 950 buffer_append(berr, string, strlen(string));
951
952 /* Restore terminal modes and suspend. */
953 client_suspend_self(bin, bout, berr);
954
955 /* We have been continued. */
956 continue;
957
a7213e65 958 case 'B':
959 if (compat20) {
960 snprintf(string, sizeof string,
961 "%cB\r\n", escape_char);
962 buffer_append(berr, string,
963 strlen(string));
964 channel_request_start(session_ident,
965 "break", 0);
966 packet_put_int(1000);
967 packet_send();
968 }
969 continue;
970
3c0ef626 971 case 'R':
972 if (compat20) {
973 if (datafellows & SSH_BUG_NOREKEY)
5156b1a1 974 logit("Server does not "
975 "support re-keying");
3c0ef626 976 else
977 need_rekeying = 1;
978 }
979 continue;
980
981 case '&':
5156b1a1 982 if (c && c->ctl_fd != -1)
983 goto noescape;
3c0ef626 984 /*
5156b1a1 985 * Detach the program (continue to serve
986 * connections, but put in background and no
987 * more new connections).
3c0ef626 988 */
989 /* Restore tty modes. */
990 leave_raw_mode();
991
992 /* Stop listening for new connections. */
993 channel_stop_listening();
994
995 snprintf(string, sizeof string,
996 "%c& [backgrounded]\n", escape_char);
997 buffer_append(berr, string, strlen(string));
998
999 /* Fork into background. */
1000 pid = fork();
1001 if (pid < 0) {
1002 error("fork: %.100s", strerror(errno));
1003 continue;
1004 }
1005 if (pid != 0) { /* This is the parent. */
1006 /* The parent just exits. */
1007 exit(0);
1008 }
1009 /* The child continues serving connections. */
1010 if (compat20) {
1011 buffer_append(bin, "\004", 1);
1012 /* fake EOF on stdin */
1013 return -1;
1014 } else if (!stdin_eof) {
1015 /*
5156b1a1 1016 * Sending SSH_CMSG_EOF alone does not
1017 * always appear to be enough. So we
1018 * try to send an EOF character first.
3c0ef626 1019 */
1020 packet_start(SSH_CMSG_STDIN_DATA);
1021 packet_put_string("\004", 1);
1022 packet_send();
1023 /* Close stdin. */
1024 stdin_eof = 1;
1025 if (buffer_len(bin) == 0) {
1026 packet_start(SSH_CMSG_EOF);
1027 packet_send();
1028 }
1029 }
1030 continue;
1031
1032 case '?':
5156b1a1 1033 if (c && c->ctl_fd != -1) {
1034 snprintf(string, sizeof string,
3c0ef626 1035"%c?\r\n\
1036Supported escape sequences:\r\n\
5156b1a1 1037 %c. - terminate session\r\n\
1038 %cB - send a BREAK to the remote system\r\n\
1039 %cC - open a command line\r\n\
1040 %cR - Request rekey (SSH protocol 2 only)\r\n\
1041 %c# - list forwarded connections\r\n\
1042 %c? - this message\r\n\
1043 %c%c - send the escape character by typing it twice\r\n\
3c0ef626 1044(Note that escapes are only recognized immediately after newline.)\r\n",
5156b1a1 1045 escape_char, escape_char,
1046 escape_char, escape_char,
1047 escape_char, escape_char,
1048 escape_char, escape_char,
1049 escape_char);
1050 } else {
1051 snprintf(string, sizeof string,
1052"%c?\r\n\
1053Supported escape sequences:\r\n\
1054 %c. - terminate connection (and any multiplexed sessions)\r\n\
1055 %cB - send a BREAK to the remote system\r\n\
1056 %cC - open a command line\r\n\
1057 %cR - Request rekey (SSH protocol 2 only)\r\n\
1058 %c^Z - suspend ssh\r\n\
1059 %c# - list forwarded connections\r\n\
1060 %c& - background ssh (when waiting for connections to terminate)\r\n\
1061 %c? - this message\r\n\
1062 %c%c - send the escape character by typing it twice\r\n\
1063(Note that escapes are only recognized immediately after newline.)\r\n",
1064 escape_char, escape_char,
1065 escape_char, escape_char,
1066 escape_char, escape_char,
1067 escape_char, escape_char,
1068 escape_char, escape_char,
1069 escape_char);
1070 }
3c0ef626 1071 buffer_append(berr, string, strlen(string));
1072 continue;
1073
1074 case '#':
5156b1a1 1075 snprintf(string, sizeof string, "%c#\r\n",
1076 escape_char);
3c0ef626 1077 buffer_append(berr, string, strlen(string));
1078 s = channel_open_message();
1079 buffer_append(berr, s, strlen(s));
1080 xfree(s);
1081 continue;
1082
a7213e65 1083 case 'C':
1084 process_cmdline();
1085 continue;
1086
3c0ef626 1087 default:
1088 if (ch != escape_char) {
1089 buffer_put_char(bin, escape_char);
1090 bytes++;
1091 }
1092 /* Escaped characters fall through here */
1093 break;
1094 }
1095 } else {
1096 /*
5156b1a1 1097 * The previous character was not an escape char.
1098 * Check if this is an escape.
3c0ef626 1099 */
1100 if (last_was_cr && ch == escape_char) {
5156b1a1 1101 /*
1102 * It is. Set the flag and continue to
1103 * next character.
1104 */
1105 *escape_pendingp = 1;
3c0ef626 1106 continue;
1107 }
1108 }
1109
1110 /*
1111 * Normal character. Record whether it was a newline,
1112 * and append it to the buffer.
1113 */
1114 last_was_cr = (ch == '\r' || ch == '\n');
1115 buffer_put_char(bin, ch);
1116 bytes++;
1117 }
1118 return bytes;
1119}
1120
1121static void
30460aeb 1122client_process_input(fd_set *readset)
3c0ef626 1123{
1124 int len;
1125 char buf[8192];
1126
1127 /* Read input from stdin. */
1128 if (FD_ISSET(fileno(stdin), readset)) {
1129 /* Read as much as possible. */
1130 len = read(fileno(stdin), buf, sizeof(buf));
5156b1a1 1131 if (len < 0 &&
1132 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
3c0ef626 1133 return; /* we'll try again later */
1134 if (len <= 0) {
1135 /*
1136 * Received EOF or error. They are treated
1137 * similarly, except that an error message is printed
1138 * if it was an error condition.
1139 */
1140 if (len < 0) {
5156b1a1 1141 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1142 strerror(errno));
3c0ef626 1143 buffer_append(&stderr_buffer, buf, strlen(buf));
1144 }
1145 /* Mark that we have seen EOF. */
1146 stdin_eof = 1;
1147 /*
1148 * Send an EOF message to the server unless there is
1149 * data in the buffer. If there is data in the
1150 * buffer, no message will be sent now. Code
1151 * elsewhere will send the EOF when the buffer
1152 * becomes empty if stdin_eof is set.
1153 */
1154 if (buffer_len(&stdin_buffer) == 0) {
1155 packet_start(SSH_CMSG_EOF);
1156 packet_send();
1157 }
5156b1a1 1158 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
3c0ef626 1159 /*
1160 * Normal successful read, and no escape character.
1161 * Just append the data to buffer.
1162 */
1163 buffer_append(&stdin_buffer, buf, len);
1164 } else {
1165 /*
5156b1a1 1166 * Normal, successful read. But we have an escape
1167 * character and have to process the characters one
1168 * by one.
3c0ef626 1169 */
5156b1a1 1170 if (process_escapes(NULL, &stdin_buffer,
1171 &stdout_buffer, &stderr_buffer, buf, len) == -1)
3c0ef626 1172 return;
1173 }
1174 }
1175}
1176
1177static void
30460aeb 1178client_process_output(fd_set *writeset)
3c0ef626 1179{
1180 int len;
1181 char buf[100];
1182
1183 /* Write buffered output to stdout. */
1184 if (FD_ISSET(fileno(stdout), writeset)) {
1185 /* Write as much data as possible. */
1186 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1187 buffer_len(&stdout_buffer));
1188 if (len <= 0) {
5156b1a1 1189 if (errno == EINTR || errno == EAGAIN ||
1190 errno == EWOULDBLOCK)
3c0ef626 1191 len = 0;
1192 else {
1193 /*
1194 * An error or EOF was encountered. Put an
1195 * error message to stderr buffer.
1196 */
5156b1a1 1197 snprintf(buf, sizeof buf,
1198 "write stdout: %.50s\r\n", strerror(errno));
3c0ef626 1199 buffer_append(&stderr_buffer, buf, strlen(buf));
1200 quit_pending = 1;
1201 return;
1202 }
1203 }
1204 /* Consume printed data from the buffer. */
1205 buffer_consume(&stdout_buffer, len);
3c0ef626 1206 }
1207 /* Write buffered output to stderr. */
1208 if (FD_ISSET(fileno(stderr), writeset)) {
1209 /* Write as much data as possible. */
1210 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1211 buffer_len(&stderr_buffer));
1212 if (len <= 0) {
5156b1a1 1213 if (errno == EINTR || errno == EAGAIN ||
1214 errno == EWOULDBLOCK)
3c0ef626 1215 len = 0;
1216 else {
5156b1a1 1217 /*
1218 * EOF or error, but can't even print
1219 * error message.
1220 */
3c0ef626 1221 quit_pending = 1;
1222 return;
1223 }
1224 }
1225 /* Consume printed characters from the buffer. */
1226 buffer_consume(&stderr_buffer, len);
3c0ef626 1227 }
1228}
1229
1230/*
1231 * Get packets from the connection input buffer, and process them as long as
1232 * there are packets available.
1233 *
1234 * Any unknown packets received during the actual
1235 * session cause the session to terminate. This is
1236 * intended to make debugging easier since no
1237 * confirmations are sent. Any compatible protocol
1238 * extensions must be negotiated during the
1239 * preparatory phase.
1240 */
1241
1242static void
1243client_process_buffered_input_packets(void)
1244{
5156b1a1 1245 dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1246 compat20 ? xxx_kex : NULL);
3c0ef626 1247}
1248
1249/* scan buf[] for '~' before sending data to the peer */
1250
5156b1a1 1251/* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1252void *
1253client_new_escape_filter_ctx(int escape_char)
1254{
1255 struct escape_filter_ctx *ret;
1256
1257 ret = xmalloc(sizeof(*ret));
1258 ret->escape_pending = 0;
1259 ret->escape_char = escape_char;
1260 return (void *)ret;
1261}
1262
1263/* Free the escape filter context on channel free */
1264void
1265client_filter_cleanup(int cid, void *ctx)
3c0ef626 1266{
5156b1a1 1267 xfree(ctx);
1268}
1269
1270int
1271client_simple_escape_filter(Channel *c, char *buf, int len)
1272{
1273 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1274 return 0;
1275
1276 return process_escapes(c, &c->input, &c->output, &c->extended,
1277 buf, len);
3c0ef626 1278}
1279
1280static void
1281client_channel_closed(int id, void *arg)
1282{
3c0ef626 1283 channel_cancel_cleanup(id);
1284 session_closed = 1;
a7213e65 1285 leave_raw_mode();
3c0ef626 1286}
1287
1288/*
1289 * Implements the interactive session with the server. This is called after
1290 * the user has been authenticated, and a command has been started on the
1291 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1292 * used as an escape character for terminating or suspending the session.
1293 */
1294
1295int
1296client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1297{
1298 fd_set *readset = NULL, *writeset = NULL;
1299 double start_time, total_time;
a7213e65 1300 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
5156b1a1 1301 u_int64_t ibytes, obytes;
a7213e65 1302 u_int nalloc = 0;
3c0ef626 1303 char buf[100];
1304
1305 debug("Entering interactive session.");
1306
1307 start_time = get_current_time();
1308
1309 /* Initialize variables. */
5156b1a1 1310 escape_pending1 = 0;
3c0ef626 1311 last_was_cr = 1;
1312 exit_status = -1;
1313 stdin_eof = 0;
1314 buffer_high = 64 * 1024;
1315 connection_in = packet_get_connection_in();
1316 connection_out = packet_get_connection_out();
1317 max_fd = MAX(connection_in, connection_out);
5156b1a1 1318 if (muxserver_sock != -1)
1319 max_fd = MAX(max_fd, muxserver_sock);
3c0ef626 1320
1321 if (!compat20) {
1322 /* enable nonblocking unless tty */
1323 if (!isatty(fileno(stdin)))
1324 set_nonblock(fileno(stdin));
1325 if (!isatty(fileno(stdout)))
1326 set_nonblock(fileno(stdout));
1327 if (!isatty(fileno(stderr)))
1328 set_nonblock(fileno(stderr));
1329 max_fd = MAX(max_fd, fileno(stdin));
1330 max_fd = MAX(max_fd, fileno(stdout));
1331 max_fd = MAX(max_fd, fileno(stderr));
1332 }
3c0ef626 1333 quit_pending = 0;
5156b1a1 1334 escape_char1 = escape_char_arg;
3c0ef626 1335
1336 /* Initialize buffers. */
1337 buffer_init(&stdin_buffer);
1338 buffer_init(&stdout_buffer);
1339 buffer_init(&stderr_buffer);
1340
1341 client_init_dispatch();
1342
a7213e65 1343 /*
1344 * Set signal handlers, (e.g. to restore non-blocking mode)
1345 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1346 */
1347 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1348 signal(SIGHUP, signal_handler);
1349 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1350 signal(SIGINT, signal_handler);
1351 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1352 signal(SIGQUIT, signal_handler);
1353 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1354 signal(SIGTERM, signal_handler);
1355 signal(SIGWINCH, window_change_handler);
3c0ef626 1356
1357 if (have_pty)
1358 enter_raw_mode();
1359
1360 if (compat20) {
1361 session_ident = ssh2_chan_id;
5156b1a1 1362 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
3c0ef626 1363 channel_register_filter(session_ident,
5156b1a1 1364 client_simple_escape_filter, NULL,
1365 client_filter_cleanup,
1366 client_new_escape_filter_ctx(escape_char_arg));
3c0ef626 1367 if (session_ident != -1)
1368 channel_register_cleanup(session_ident,
a7213e65 1369 client_channel_closed, 0);
3c0ef626 1370 } else {
1371 /* Check if we should immediately send eof on stdin. */
1372 client_check_initial_eof_on_stdin();
1373 }
1374
1375 /* Main loop of the client for the interactive session mode. */
1376 while (!quit_pending) {
1377
1378 /* Process buffered packets sent by the server. */
1379 client_process_buffered_input_packets();
1380
1381 if (compat20 && session_closed && !channel_still_open())
1382 break;
1383
1384 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1385
1386 if (rekeying) {
1387 debug("rekeying in progress");
1388 } else {
1389 /*
1390 * Make packets of buffered stdin data, and buffer
1391 * them for sending to the server.
1392 */
1393 if (!compat20)
1394 client_make_packets_from_stdin_data();
1395
1396 /*
1397 * Make packets from buffered channel data, and
1398 * enqueue them for sending to the server.
1399 */
1400 if (packet_not_very_much_data_to_write())
1401 channel_output_poll();
1402
1403 /*
1404 * Check if the window size has changed, and buffer a
1405 * message about it to the server if so.
1406 */
1407 client_check_window_change();
1408
1409 if (quit_pending)
1410 break;
1411 }
1412 /*
1413 * Wait until we have something to do (something becomes
1414 * available on one of the descriptors).
1415 */
1416 max_fd2 = max_fd;
1417 client_wait_until_can_do_something(&readset, &writeset,
1418 &max_fd2, &nalloc, rekeying);
1419
1420 if (quit_pending)
1421 break;
1422
1423 /* Do channel operations unless rekeying in progress. */
1424 if (!rekeying) {
1425 channel_after_select(readset, writeset);
a7213e65 1426 if (need_rekeying || packet_need_rekeying()) {
1427 debug("need rekeying");
3c0ef626 1428 xxx_kex->done = 0;
1429 kex_send_kexinit(xxx_kex);
1430 need_rekeying = 0;
1431 }
1432 }
1433
1434 /* Buffer input from the connection. */
1435 client_process_net_input(readset);
1436
a7213e65 1437 /* Accept control connections. */
5156b1a1 1438 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1439 if (muxserver_accept_control())
1440 quit_pending = 1;
1441 }
a7213e65 1442
3c0ef626 1443 if (quit_pending)
1444 break;
1445
1446 if (!compat20) {
1447 /* Buffer data from stdin */
1448 client_process_input(readset);
1449 /*
1450 * Process output to stdout and stderr. Output to
1451 * the connection is processed elsewhere (above).
1452 */
1453 client_process_output(writeset);
1454 }
1455
5156b1a1 1456 /*
1457 * Send as much buffered packet data as possible to the
1458 * sender.
1459 */
3c0ef626 1460 if (FD_ISSET(connection_out, writeset))
1461 packet_write_poll();
1462 }
1463 if (readset)
1464 xfree(readset);
1465 if (writeset)
1466 xfree(writeset);
1467
1468 /* Terminate the session. */
1469
1470 /* Stop watching for window change. */
a7213e65 1471 signal(SIGWINCH, SIG_DFL);
3c0ef626 1472
1473 channel_free_all();
1474
1475 if (have_pty)
1476 leave_raw_mode();
1477
1478 /* restore blocking io */
1479 if (!isatty(fileno(stdin)))
1480 unset_nonblock(fileno(stdin));
1481 if (!isatty(fileno(stdout)))
1482 unset_nonblock(fileno(stdout));
1483 if (!isatty(fileno(stderr)))
1484 unset_nonblock(fileno(stderr));
1485
a7213e65 1486 /*
1487 * If there was no shell or command requested, there will be no remote
1488 * exit status to be returned. In that case, clear error code if the
1489 * connection was deliberately terminated at this end.
1490 */
1491 if (no_shell_flag && received_signal == SIGTERM) {
1492 received_signal = 0;
1493 exit_status = 0;
3c0ef626 1494 }
1495
a7213e65 1496 if (received_signal)
1497 fatal("Killed by signal %d.", (int) received_signal);
1498
3c0ef626 1499 /*
1500 * In interactive mode (with pseudo tty) display a message indicating
1501 * that the connection has been closed.
1502 */
1503 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
5156b1a1 1504 snprintf(buf, sizeof buf,
1505 "Connection to %.64s closed.\r\n", host);
3c0ef626 1506 buffer_append(&stderr_buffer, buf, strlen(buf));
1507 }
1508
1509 /* Output any buffered data for stdout. */
1510 while (buffer_len(&stdout_buffer) > 0) {
1511 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1512 buffer_len(&stdout_buffer));
1513 if (len <= 0) {
1514 error("Write failed flushing stdout buffer.");
1515 break;
1516 }
1517 buffer_consume(&stdout_buffer, len);
3c0ef626 1518 }
1519
1520 /* Output any buffered data for stderr. */
1521 while (buffer_len(&stderr_buffer) > 0) {
1522 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1523 buffer_len(&stderr_buffer));
1524 if (len <= 0) {
1525 error("Write failed flushing stderr buffer.");
1526 break;
1527 }
1528 buffer_consume(&stderr_buffer, len);
3c0ef626 1529 }
1530
1531 /* Clear and free any buffers. */
1532 memset(buf, 0, sizeof(buf));
1533 buffer_free(&stdin_buffer);
1534 buffer_free(&stdout_buffer);
1535 buffer_free(&stderr_buffer);
1536
1537 /* Report bytes transferred, and transfer rates. */
1538 total_time = get_current_time() - start_time;
5156b1a1 1539 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1540 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1541 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1542 obytes, ibytes, total_time);
3c0ef626 1543 if (total_time > 0)
5156b1a1 1544 verbose("Bytes per second: sent %.1f, received %.1f",
1545 obytes / total_time, ibytes / total_time);
3c0ef626 1546 /* Return the exit status of the program. */
1547 debug("Exit status %d", exit_status);
1548 return exit_status;
1549}
1550
1551/*********/
1552
1553static void
a7213e65 1554client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
3c0ef626 1555{
1556 u_int data_len;
1557 char *data = packet_get_string(&data_len);
a7213e65 1558 packet_check_eom();
3c0ef626 1559 buffer_append(&stdout_buffer, data, data_len);
1560 memset(data, 0, data_len);
1561 xfree(data);
1562}
1563static void
a7213e65 1564client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
3c0ef626 1565{
1566 u_int data_len;
1567 char *data = packet_get_string(&data_len);
a7213e65 1568 packet_check_eom();
3c0ef626 1569 buffer_append(&stderr_buffer, data, data_len);
1570 memset(data, 0, data_len);
1571 xfree(data);
1572}
1573static void
a7213e65 1574client_input_exit_status(int type, u_int32_t seq, void *ctxt)
3c0ef626 1575{
3c0ef626 1576 exit_status = packet_get_int();
a7213e65 1577 packet_check_eom();
3c0ef626 1578 /* Acknowledge the exit. */
1579 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1580 packet_send();
1581 /*
1582 * Must wait for packet to be sent since we are
1583 * exiting the loop.
1584 */
1585 packet_write_wait();
1586 /* Flag that we want to exit. */
1587 quit_pending = 1;
1588}
a7213e65 1589static void
1590client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1591{
1592 Channel *c = NULL;
1593 int remote_id, sock;
1594
1595 /* Read the remote channel number from the message. */
1596 remote_id = packet_get_int();
1597 packet_check_eom();
1598
1599 /*
1600 * Get a connection to the local authentication agent (this may again
1601 * get forwarded).
1602 */
1603 sock = ssh_get_authentication_socket();
1604
1605 /*
1606 * If we could not connect the agent, send an error message back to
1607 * the server. This should never happen unless the agent dies,
1608 * because authentication forwarding is only enabled if we have an
1609 * agent.
1610 */
1611 if (sock >= 0) {
1612 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1613 -1, 0, 0, 0, "authentication agent connection", 1);
1614 c->remote_id = remote_id;
1615 c->force_drain = 1;
1616 }
1617 if (c == NULL) {
1618 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1619 packet_put_int(remote_id);
1620 } else {
1621 /* Send a confirmation to the remote host. */
1622 debug("Forwarding authentication connection.");
1623 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1624 packet_put_int(remote_id);
1625 packet_put_int(c->self);
1626 }
1627 packet_send();
1628}
3c0ef626 1629
1630static Channel *
1631client_request_forwarded_tcpip(const char *request_type, int rchan)
1632{
a7213e65 1633 Channel *c = NULL;
3c0ef626 1634 char *listen_address, *originator_address;
1635 int listen_port, originator_port;
3c0ef626 1636
1637 /* Get rest of the packet */
1638 listen_address = packet_get_string(NULL);
1639 listen_port = packet_get_int();
1640 originator_address = packet_get_string(NULL);
1641 originator_port = packet_get_int();
a7213e65 1642 packet_check_eom();
3c0ef626 1643
5156b1a1 1644 debug("client_request_forwarded_tcpip: listen %s port %d, "
1645 "originator %s port %d", listen_address, listen_port,
1646 originator_address, originator_port);
1647
1648 c = channel_connect_by_listen_address(listen_port,
1649 "forwarded-tcpip", originator_address);
3c0ef626 1650
3c0ef626 1651 xfree(originator_address);
1652 xfree(listen_address);
1653 return c;
1654}
1655
a7213e65 1656static Channel *
3c0ef626 1657client_request_x11(const char *request_type, int rchan)
1658{
1659 Channel *c = NULL;
1660 char *originator;
1661 int originator_port;
1662 int sock;
1663
1664 if (!options.forward_x11) {
1665 error("Warning: ssh server tried X11 forwarding.");
5156b1a1 1666 error("Warning: this is probably a break-in attempt by a "
1667 "malicious server.");
3c0ef626 1668 return NULL;
1669 }
1670 originator = packet_get_string(NULL);
1671 if (datafellows & SSH_BUG_X11FWD) {
1672 debug2("buggy server: x11 request w/o originator_port");
1673 originator_port = 0;
1674 } else {
1675 originator_port = packet_get_int();
1676 }
a7213e65 1677 packet_check_eom();
3c0ef626 1678 /* XXX check permission */
1679 debug("client_request_x11: request from %s %d", originator,
1680 originator_port);
1681 xfree(originator);
1682 sock = x11_connect_display();
1683 if (sock < 0)
1684 return NULL;
6df46d40 1685 /* again is this really necessary for X11? */
a7213e65 1686 if (options.hpn_disabled)
6df46d40 1687 c = channel_new("x11",
1688 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1689 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
a7213e65 1690 else
1691 c = channel_new("x11",
1692 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1693 options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
3c0ef626 1694 c->force_drain = 1;
1695 return c;
1696}
1697
a7213e65 1698static Channel *
3c0ef626 1699client_request_agent(const char *request_type, int rchan)
1700{
1701 Channel *c = NULL;
1702 int sock;
1703
1704 if (!options.forward_agent) {
1705 error("Warning: ssh server tried agent forwarding.");
5156b1a1 1706 error("Warning: this is probably a break-in attempt by a "
1707 "malicious server.");
3c0ef626 1708 return NULL;
1709 }
0b90ac93 1710 sock = ssh_get_authentication_socket();
3c0ef626 1711 if (sock < 0)
1712 return NULL;
a7213e65 1713 if (options.hpn_disabled)
6df46d40 1714 c = channel_new("authentication agent connection",
1715 SSH_CHANNEL_OPEN, sock, sock, -1,
d3057ca4 1716 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
a7213e65 1717 "authentication agent connection", 1);
d3057ca4 1718 else
1719 c = channel_new("authentication agent connection",
1720 SSH_CHANNEL_OPEN, sock, sock, -1,
1721 options.hpn_buffer_size, options.hpn_buffer_size, 0,
1722 "authentication agent connection", 1);
3c0ef626 1723 c->force_drain = 1;
1724 return c;
1725}
1726
fa0f0f45 1727int
1728client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1729{
1730 Channel *c;
1731 int fd;
1732
1733 if (tun_mode == SSH_TUNMODE_NO)
1734 return 0;
1735
1736 if (!compat20) {
1737 error("Tunnel forwarding is not support for protocol 1");
1738 return -1;
1739 }
1740
1741 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1742
1743 /* Open local tunnel device */
1744 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1745 error("Tunnel device open failed.");
1746 return -1;
1747 }
1748
4834571d 1749 if(options.hpn_disabled)
6df46d40 1750 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
4834571d 1751 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1752 0, "tun", 1);
1753 else
6df46d40 1754 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
4834571d 1755 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1756 0, "tun", 1);
fa0f0f45 1757 c->datagram = 1;
1758
d3057ca4 1759
1760
fa0f0f45 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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