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b5afdff5 1/* $OpenBSD: clientloop.c,v 1.213 2009/07/05 19:28:33 stevesk 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
9108f8d9 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
22616013 89#include "openbsd-compat/sys-queue.h"
9108f8d9 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"
9108f8d9 100#include "cipher.h"
3c0ef626 101#include "kex.h"
102#include "log.h"
103#include "readconf.h"
104#include "clientloop.h"
2c06c99b 105#include "sshconnect.h"
3c0ef626 106#include "authfd.h"
107#include "atomicio.h"
c9f39d2c 108#include "sshpty.h"
3c0ef626 109#include "misc.h"
c9f39d2c 110#include "match.h"
111#include "msg.h"
b5afdff5 112#include "roaming.h"
3c0ef626 113
f97edba6 114#ifdef GSSAPI
115#include "ssh-gss.h"
116#endif
117
3c0ef626 118/* import options */
119extern Options options;
120
121/* Flag indicating that stdin should be redirected from /dev/null. */
122extern int stdin_null_flag;
123
cdd66111 124/* Flag indicating that no shell has been requested */
125extern int no_shell_flag;
126
c9f39d2c 127/* Control socket */
22616013 128extern int muxserver_sock;
c9f39d2c 129
3c0ef626 130/*
131 * Name of the host we are connecting to. This is the name given on the
132 * command line, or the HostName specified for the user-supplied name in a
133 * configuration file.
134 */
135extern char *host;
136
137/*
138 * Flag to indicate that we have received a window change signal which has
139 * not yet been processed. This will cause a message indicating the new
140 * window size to be sent to the server a little later. This is volatile
141 * because this is updated in a signal handler.
142 */
e9a17296 143static volatile sig_atomic_t received_window_change_signal = 0;
144static volatile sig_atomic_t received_signal = 0;
3c0ef626 145
2c06c99b 146/* Flag indicating whether the user's terminal is in non-blocking mode. */
3c0ef626 147static int in_non_blocking_mode = 0;
148
149/* Common data for the client loop code. */
9108f8d9 150static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
22616013 151static int escape_char1; /* Escape character. (proto1 only) */
152static int escape_pending1; /* Last character was an escape (proto1 only) */
3c0ef626 153static int last_was_cr; /* Last character was a newline. */
22616013 154static int exit_status; /* Used to store the command exit status. */
155static int stdin_eof; /* EOF has been encountered on stderr. */
3c0ef626 156static Buffer stdin_buffer; /* Buffer for stdin data. */
157static Buffer stdout_buffer; /* Buffer for stdout data. */
158static Buffer stderr_buffer; /* Buffer for stderr data. */
3c0ef626 159static u_int buffer_high;/* Soft max buffer size. */
160static int connection_in; /* Connection to server (input). */
161static int connection_out; /* Connection to server (output). */
162static int need_rekeying; /* Set to non-zero if rekeying is requested. */
163static int session_closed = 0; /* In SSH2: login session closed. */
164
165static void client_init_dispatch(void);
166int session_ident = -1;
167
22616013 168/* Track escape per proto2 channel */
169struct escape_filter_ctx {
170 int escape_pending;
171 int escape_char;
c9f39d2c 172};
173
22616013 174/* Context for channel confirmation replies */
175struct channel_reply_ctx {
176 const char *request_type;
177 int id, do_close;
178};
179
180/* Global request success/failure callbacks */
181struct global_confirm {
182 TAILQ_ENTRY(global_confirm) entry;
183 global_confirm_cb *cb;
184 void *ctx;
185 int ref_count;
186};
187TAILQ_HEAD(global_confirms, global_confirm);
188static struct global_confirms global_confirms =
189 TAILQ_HEAD_INITIALIZER(global_confirms);
190
3c0ef626 191/*XXX*/
192extern Kex *xxx_kex;
193
c9f39d2c 194void ssh_process_session2_setup(int, int, int, Buffer *);
195
3c0ef626 196/* Restores stdin to blocking mode. */
197
198static void
199leave_non_blocking(void)
200{
201 if (in_non_blocking_mode) {
c9f39d2c 202 unset_nonblock(fileno(stdin));
3c0ef626 203 in_non_blocking_mode = 0;
3c0ef626 204 }
205}
206
207/* Puts stdin terminal in non-blocking mode. */
208
209static void
210enter_non_blocking(void)
211{
212 in_non_blocking_mode = 1;
c9f39d2c 213 set_nonblock(fileno(stdin));
3c0ef626 214}
215
216/*
217 * Signal handler for the window change signal (SIGWINCH). This just sets a
218 * flag indicating that the window has changed.
219 */
9108f8d9 220/*ARGSUSED */
3c0ef626 221static void
222window_change_handler(int sig)
223{
224 received_window_change_signal = 1;
225 signal(SIGWINCH, window_change_handler);
226}
227
228/*
229 * Signal handler for signals that cause the program to terminate. These
230 * signals must be trapped to restore terminal modes.
231 */
9108f8d9 232/*ARGSUSED */
3c0ef626 233static void
234signal_handler(int sig)
235{
236 received_signal = sig;
237 quit_pending = 1;
238}
239
240/*
241 * Returns current time in seconds from Jan 1, 1970 with the maximum
242 * available resolution.
243 */
244
245static double
246get_current_time(void)
247{
248 struct timeval tv;
249 gettimeofday(&tv, NULL);
250 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
251}
252
665a873d 253#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
254void
255client_x11_get_proto(const char *display, const char *xauth_path,
256 u_int trusted, char **_proto, char **_data)
257{
258 char cmd[1024];
259 char line[512];
260 char xdisplay[512];
261 static char proto[512], data[512];
262 FILE *f;
263 int got_data = 0, generated = 0, do_unlink = 0, i;
264 char *xauthdir, *xauthfile;
265 struct stat st;
266
267 xauthdir = xauthfile = NULL;
268 *_proto = proto;
269 *_data = data;
270 proto[0] = data[0] = '\0';
271
272 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
273 debug("No xauth program.");
274 } else {
275 if (display == NULL) {
276 debug("x11_get_proto: DISPLAY not set");
277 return;
278 }
279 /*
280 * Handle FamilyLocal case where $DISPLAY does
281 * not match an authorization entry. For this we
282 * just try "xauth list unix:displaynum.screennum".
283 * XXX: "localhost" match to determine FamilyLocal
284 * is not perfect.
285 */
286 if (strncmp(display, "localhost:", 10) == 0) {
287 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
288 display + 10);
289 display = xdisplay;
290 }
291 if (trusted == 0) {
292 xauthdir = xmalloc(MAXPATHLEN);
293 xauthfile = xmalloc(MAXPATHLEN);
294 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
295 if (mkdtemp(xauthdir) != NULL) {
296 do_unlink = 1;
297 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
298 xauthdir);
299 snprintf(cmd, sizeof(cmd),
300 "%s -f %s generate %s " SSH_X11_PROTO
301 " untrusted timeout 1200 2>" _PATH_DEVNULL,
302 xauth_path, xauthfile, display);
303 debug2("x11_get_proto: %s", cmd);
304 if (system(cmd) == 0)
305 generated = 1;
306 }
307 }
d4487008 308
309 /*
310 * When in untrusted mode, we read the cookie only if it was
311 * successfully generated as an untrusted one in the step
312 * above.
313 */
314 if (trusted || generated) {
315 snprintf(cmd, sizeof(cmd),
316 "%s %s%s list %s 2>" _PATH_DEVNULL,
317 xauth_path,
318 generated ? "-f " : "" ,
319 generated ? xauthfile : "",
320 display);
321 debug2("x11_get_proto: %s", cmd);
322 f = popen(cmd, "r");
323 if (f && fgets(line, sizeof(line), f) &&
324 sscanf(line, "%*s %511s %511s", proto, data) == 2)
325 got_data = 1;
326 if (f)
327 pclose(f);
328 } else
329 error("Warning: untrusted X11 forwarding setup failed: "
330 "xauth key data not generated");
665a873d 331 }
332
333 if (do_unlink) {
334 unlink(xauthfile);
335 rmdir(xauthdir);
336 }
337 if (xauthdir)
338 xfree(xauthdir);
339 if (xauthfile)
340 xfree(xauthfile);
341
342 /*
343 * If we didn't get authentication data, just make up some
344 * data. The forwarding code will check the validity of the
345 * response anyway, and substitute this data. The X11
346 * server, however, will ignore this fake data and use
347 * whatever authentication mechanisms it was using otherwise
348 * for the local connection.
349 */
350 if (!got_data) {
351 u_int32_t rnd = 0;
352
353 logit("Warning: No xauth data; "
354 "using fake authentication data for X11 forwarding.");
355 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
356 for (i = 0; i < 16; i++) {
357 if (i % 4 == 0)
358 rnd = arc4random();
359 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
360 rnd & 0xff);
361 rnd >>= 8;
362 }
363 }
364}
365
3c0ef626 366/*
367 * This is called when the interactive is entered. This checks if there is
368 * an EOF coming on stdin. We must check this explicitly, as select() does
369 * not appear to wake up when redirecting from /dev/null.
370 */
371
372static void
373client_check_initial_eof_on_stdin(void)
374{
375 int len;
376 char buf[1];
377
378 /*
379 * If standard input is to be "redirected from /dev/null", we simply
380 * mark that we have seen an EOF and send an EOF message to the
381 * server. Otherwise, we try to read a single character; it appears
382 * that for some files, such /dev/null, select() never wakes up for
383 * read for this descriptor, which means that we never get EOF. This
384 * way we will get the EOF if stdin comes from /dev/null or similar.
385 */
386 if (stdin_null_flag) {
387 /* Fake EOF on stdin. */
388 debug("Sending eof.");
389 stdin_eof = 1;
390 packet_start(SSH_CMSG_EOF);
391 packet_send();
392 } else {
393 enter_non_blocking();
394
395 /* Check for immediate EOF on stdin. */
396 len = read(fileno(stdin), buf, 1);
397 if (len == 0) {
22616013 398 /*
399 * EOF. Record that we have seen it and send
400 * EOF to server.
401 */
3c0ef626 402 debug("Sending eof.");
403 stdin_eof = 1;
404 packet_start(SSH_CMSG_EOF);
405 packet_send();
406 } else if (len > 0) {
407 /*
408 * Got data. We must store the data in the buffer,
409 * and also process it as an escape character if
410 * appropriate.
411 */
22616013 412 if ((u_char) buf[0] == escape_char1)
413 escape_pending1 = 1;
3c0ef626 414 else
415 buffer_append(&stdin_buffer, buf, 1);
416 }
417 leave_non_blocking();
418 }
419}
420
421
422/*
423 * Make packets from buffered stdin data, and buffer them for sending to the
424 * connection.
425 */
426
427static void
428client_make_packets_from_stdin_data(void)
429{
430 u_int len;
431
432 /* Send buffered stdin data to the server. */
433 while (buffer_len(&stdin_buffer) > 0 &&
e9a17296 434 packet_not_very_much_data_to_write()) {
3c0ef626 435 len = buffer_len(&stdin_buffer);
436 /* Keep the packets at reasonable size. */
437 if (len > packet_get_maxsize())
438 len = packet_get_maxsize();
439 packet_start(SSH_CMSG_STDIN_DATA);
440 packet_put_string(buffer_ptr(&stdin_buffer), len);
441 packet_send();
442 buffer_consume(&stdin_buffer, len);
3c0ef626 443 /* If we have a pending EOF, send it now. */
444 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
445 packet_start(SSH_CMSG_EOF);
446 packet_send();
447 }
448 }
449}
450
451/*
452 * Checks if the client window has changed, and sends a packet about it to
453 * the server if so. The actual change is detected elsewhere (by a software
454 * interrupt on Unix); this just checks the flag and sends a message if
455 * appropriate.
456 */
457
458static void
459client_check_window_change(void)
460{
461 struct winsize ws;
462
463 if (! received_window_change_signal)
464 return;
465 /** XXX race */
466 received_window_change_signal = 0;
467
3c0ef626 468 debug2("client_check_window_change: changed");
469
470 if (compat20) {
c9f39d2c 471 channel_send_window_changes();
3c0ef626 472 } else {
c9f39d2c 473 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
474 return;
3c0ef626 475 packet_start(SSH_CMSG_WINDOW_SIZE);
9108f8d9 476 packet_put_int((u_int)ws.ws_row);
477 packet_put_int((u_int)ws.ws_col);
478 packet_put_int((u_int)ws.ws_xpixel);
479 packet_put_int((u_int)ws.ws_ypixel);
3c0ef626 480 packet_send();
481 }
482}
483
cdd66111 484static void
485client_global_request_reply(int type, u_int32_t seq, void *ctxt)
486{
22616013 487 struct global_confirm *gc;
488
489 if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
490 return;
491 if (gc->cb != NULL)
492 gc->cb(type, seq, gc->ctx);
493 if (--gc->ref_count <= 0) {
494 TAILQ_REMOVE(&global_confirms, gc, entry);
495 bzero(gc, sizeof(*gc));
496 xfree(gc);
497 }
498
b5afdff5 499 packet_set_alive_timeouts(0);
cdd66111 500}
501
502static void
503server_alive_check(void)
504{
b5afdff5 505 if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
ff7ec503 506 logit("Timeout, server not responding.");
507 cleanup_exit(255);
508 }
cdd66111 509 packet_start(SSH2_MSG_GLOBAL_REQUEST);
510 packet_put_cstring("keepalive@openssh.com");
511 packet_put_char(1); /* boolean: want reply */
512 packet_send();
22616013 513 /* Insert an empty placeholder to maintain ordering */
514 client_register_global_confirm(NULL, NULL);
cdd66111 515}
516
3c0ef626 517/*
518 * Waits until the client can do something (some data becomes available on
519 * one of the file descriptors).
520 */
3c0ef626 521static void
522client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
c9f39d2c 523 int *maxfdp, u_int *nallocp, int rekeying)
3c0ef626 524{
cdd66111 525 struct timeval tv, *tvp;
526 int ret;
527
3c0ef626 528 /* Add any selections by the channel mechanism. */
529 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
530
531 if (!compat20) {
532 /* Read from the connection, unless our buffers are full. */
533 if (buffer_len(&stdout_buffer) < buffer_high &&
534 buffer_len(&stderr_buffer) < buffer_high &&
535 channel_not_very_much_buffered_data())
536 FD_SET(connection_in, *readsetp);
537 /*
538 * Read from stdin, unless we have seen EOF or have very much
539 * buffered data to send to the server.
540 */
541 if (!stdin_eof && packet_not_very_much_data_to_write())
542 FD_SET(fileno(stdin), *readsetp);
543
544 /* Select stdout/stderr if have data in buffer. */
545 if (buffer_len(&stdout_buffer) > 0)
546 FD_SET(fileno(stdout), *writesetp);
547 if (buffer_len(&stderr_buffer) > 0)
548 FD_SET(fileno(stderr), *writesetp);
549 } else {
550 /* channel_prepare_select could have closed the last channel */
551 if (session_closed && !channel_still_open() &&
552 !packet_have_data_to_write()) {
553 /* clear mask since we did not call select() */
554 memset(*readsetp, 0, *nallocp);
555 memset(*writesetp, 0, *nallocp);
556 return;
557 } else {
558 FD_SET(connection_in, *readsetp);
559 }
560 }
561
562 /* Select server connection if have data to write to the server. */
563 if (packet_have_data_to_write())
564 FD_SET(connection_out, *writesetp);
565
22616013 566 if (muxserver_sock != -1)
567 FD_SET(muxserver_sock, *readsetp);
c9f39d2c 568
3c0ef626 569 /*
570 * Wait for something to happen. This will suspend the process until
571 * some selected descriptor can be read, written, or has some other
cdd66111 572 * event pending.
3c0ef626 573 */
574
cdd66111 575 if (options.server_alive_interval == 0 || !compat20)
576 tvp = NULL;
c9f39d2c 577 else {
cdd66111 578 tv.tv_sec = options.server_alive_interval;
579 tv.tv_usec = 0;
580 tvp = &tv;
581 }
582 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
583 if (ret < 0) {
3c0ef626 584 char buf[100];
585
586 /*
587 * We have to clear the select masks, because we return.
588 * We have to return, because the mainloop checks for the flags
589 * set by the signal handlers.
590 */
591 memset(*readsetp, 0, *nallocp);
592 memset(*writesetp, 0, *nallocp);
593
594 if (errno == EINTR)
595 return;
596 /* Note: we might still have data in the buffers. */
597 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
598 buffer_append(&stderr_buffer, buf, strlen(buf));
599 quit_pending = 1;
cdd66111 600 } else if (ret == 0)
601 server_alive_check();
3c0ef626 602}
603
604static void
605client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
606{
3c0ef626 607 /* Flush stdout and stderr buffers. */
608 if (buffer_len(bout) > 0)
22616013 609 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
610 buffer_len(bout));
3c0ef626 611 if (buffer_len(berr) > 0)
22616013 612 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
613 buffer_len(berr));
3c0ef626 614
615 leave_raw_mode();
616
617 /*
618 * Free (and clear) the buffer to reduce the amount of data that gets
619 * written to swap.
620 */
621 buffer_free(bin);
622 buffer_free(bout);
623 buffer_free(berr);
624
3c0ef626 625 /* Send the suspend signal to the program itself. */
626 kill(getpid(), SIGTSTP);
627
996d5e62 628 /* Reset window sizes in case they have changed */
629 received_window_change_signal = 1;
3c0ef626 630
631 /* OK, we have been continued by the user. Reinitialize buffers. */
632 buffer_init(bin);
633 buffer_init(bout);
634 buffer_init(berr);
635
636 enter_raw_mode();
637}
638
639static void
9108f8d9 640client_process_net_input(fd_set *readset)
3c0ef626 641{
b5afdff5 642 int len, cont = 0;
643 char buf[SSH_IOBUFSZ];
3c0ef626 644
645 /*
646 * Read input from the server, and add any such data to the buffer of
647 * the packet subsystem.
648 */
649 if (FD_ISSET(connection_in, readset)) {
650 /* Read as much as possible. */
b5afdff5 651 len = roaming_read(connection_in, buf, sizeof(buf), &cont);
652 if (len == 0 && cont == 0) {
22616013 653 /*
654 * Received EOF. The remote host has closed the
655 * connection.
656 */
657 snprintf(buf, sizeof buf,
658 "Connection to %.300s closed by remote host.\r\n",
659 host);
3c0ef626 660 buffer_append(&stderr_buffer, buf, strlen(buf));
661 quit_pending = 1;
662 return;
663 }
664 /*
665 * There is a kernel bug on Solaris that causes select to
666 * sometimes wake up even though there is no data available.
667 */
22616013 668 if (len < 0 &&
669 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
3c0ef626 670 len = 0;
671
672 if (len < 0) {
22616013 673 /*
674 * An error has encountered. Perhaps there is a
675 * network problem.
676 */
677 snprintf(buf, sizeof buf,
678 "Read from remote host %.300s: %.100s\r\n",
679 host, strerror(errno));
3c0ef626 680 buffer_append(&stderr_buffer, buf, strlen(buf));
681 quit_pending = 1;
682 return;
683 }
684 packet_process_incoming(buf, len);
685 }
686}
687
c9f39d2c 688static void
22616013 689client_status_confirm(int type, Channel *c, void *ctx)
c9f39d2c 690{
22616013 691 struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
692 char errmsg[256];
693 int tochan;
694
695 /* XXX supress on mux _client_ quietmode */
696 tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
697 c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
698
699 if (type == SSH2_MSG_CHANNEL_SUCCESS) {
700 debug2("%s request accepted on channel %d",
701 cr->request_type, c->self);
702 } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
703 if (tochan) {
704 snprintf(errmsg, sizeof(errmsg),
705 "%s request failed\r\n", cr->request_type);
706 } else {
707 snprintf(errmsg, sizeof(errmsg),
708 "%s request failed on channel %d",
709 cr->request_type, c->self);
710 }
711 /* If error occurred on primary session channel, then exit */
712 if (cr->do_close && c->self == session_ident)
713 fatal("%s", errmsg);
714 /* If error occurred on mux client, append to their stderr */
715 if (tochan)
716 buffer_append(&c->extended, errmsg, strlen(errmsg));
717 else
718 error("%s", errmsg);
719 if (cr->do_close) {
720 chan_read_failed(c);
721 chan_write_failed(c);
722 }
c9f39d2c 723 }
22616013 724 xfree(cr);
c9f39d2c 725}
726
727static void
22616013 728client_abandon_status_confirm(Channel *c, void *ctx)
c9f39d2c 729{
22616013 730 xfree(ctx);
c9f39d2c 731}
732
733static void
22616013 734client_expect_confirm(int id, const char *request, int do_close)
c9f39d2c 735{
22616013 736 struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
c9f39d2c 737
22616013 738 cr->request_type = request;
739 cr->do_close = do_close;
c9f39d2c 740
22616013 741 channel_register_status_confirm(id, client_status_confirm,
742 client_abandon_status_confirm, cr);
743}
c9f39d2c 744
22616013 745void
746client_register_global_confirm(global_confirm_cb *cb, void *ctx)
747{
748 struct global_confirm *gc, *last_gc;
749
750 /* Coalesce identical callbacks */
751 last_gc = TAILQ_LAST(&global_confirms, global_confirms);
752 if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
753 if (++last_gc->ref_count >= INT_MAX)
754 fatal("%s: last_gc->ref_count = %d",
755 __func__, last_gc->ref_count);
c9f39d2c 756 return;
757 }
c9f39d2c 758
22616013 759 gc = xmalloc(sizeof(*gc));
760 gc->cb = cb;
761 gc->ctx = ctx;
762 gc->ref_count = 1;
763 TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
c9f39d2c 764}
765
700318f3 766static void
767process_cmdline(void)
768{
769 void (*handler)(int);
996d5e62 770 char *s, *cmd, *cancel_host;
c9f39d2c 771 int delete = 0;
91d9cdd3 772 int local = 0, remote = 0, dynamic = 0;
773 int cancel_port;
996d5e62 774 Forward fwd;
700318f3 775
47686178 776 bzero(&fwd, sizeof(fwd));
777 fwd.listen_host = fwd.connect_host = NULL;
778
700318f3 779 leave_raw_mode();
f5799ae1 780 handler = signal(SIGINT, SIG_IGN);
700318f3 781 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
782 if (s == NULL)
783 goto out;
d4487008 784 while (isspace(*s))
700318f3 785 s++;
c9f39d2c 786 if (*s == '-')
787 s++; /* Skip cmdline '-', if any */
788 if (*s == '\0')
789 goto out;
790
791 if (*s == 'h' || *s == 'H' || *s == '?') {
792 logit("Commands:");
9108f8d9 793 logit(" -L[bind_address:]port:host:hostport "
794 "Request local forward");
795 logit(" -R[bind_address:]port:host:hostport "
796 "Request remote forward");
91d9cdd3 797 logit(" -D[bind_address:]port "
798 "Request dynamic forward");
9108f8d9 799 logit(" -KR[bind_address:]port "
800 "Cancel remote forward");
2c06c99b 801 if (!options.permit_local_command)
802 goto out;
9108f8d9 803 logit(" !args "
804 "Execute local command");
2c06c99b 805 goto out;
806 }
807
808 if (*s == '!' && options.permit_local_command) {
809 s++;
810 ssh_local_cmd(s);
700318f3 811 goto out;
c9f39d2c 812 }
813
814 if (*s == 'K') {
815 delete = 1;
816 s++;
817 }
91d9cdd3 818 if (*s == 'L')
819 local = 1;
820 else if (*s == 'R')
821 remote = 1;
822 else if (*s == 'D')
823 dynamic = 1;
824 else {
0fff78ff 825 logit("Invalid command.");
700318f3 826 goto out;
827 }
91d9cdd3 828
829 if ((local || dynamic) && delete) {
c9f39d2c 830 logit("Not supported.");
831 goto out;
832 }
91d9cdd3 833 if (remote && delete && !compat20) {
0fff78ff 834 logit("Not supported for SSH protocol version 1.");
700318f3 835 goto out;
836 }
c9f39d2c 837
d4487008 838 while (isspace(*++s))
839 ;
700318f3 840
c9f39d2c 841 if (delete) {
996d5e62 842 cancel_port = 0;
843 cancel_host = hpdelim(&s); /* may be NULL */
844 if (s != NULL) {
845 cancel_port = a2port(s);
846 cancel_host = cleanhostname(cancel_host);
847 } else {
848 cancel_port = a2port(cancel_host);
849 cancel_host = NULL;
c9f39d2c 850 }
91d9cdd3 851 if (cancel_port <= 0) {
996d5e62 852 logit("Bad forwarding close port");
c9f39d2c 853 goto out;
854 }
996d5e62 855 channel_request_rforward_cancel(cancel_host, cancel_port);
c9f39d2c 856 } else {
91d9cdd3 857 if (!parse_forward(&fwd, s, dynamic, remote)) {
c9f39d2c 858 logit("Bad forwarding specification.");
859 goto out;
860 }
91d9cdd3 861 if (local || dynamic) {
996d5e62 862 if (channel_setup_local_fwd_listener(fwd.listen_host,
863 fwd.listen_port, fwd.connect_host,
864 fwd.connect_port, options.gateway_ports) < 0) {
c9f39d2c 865 logit("Port forwarding failed.");
866 goto out;
867 }
996d5e62 868 } else {
9108f8d9 869 if (channel_request_remote_forwarding(fwd.listen_host,
996d5e62 870 fwd.listen_port, fwd.connect_host,
9108f8d9 871 fwd.connect_port) < 0) {
872 logit("Port forwarding failed.");
873 goto out;
874 }
996d5e62 875 }
876
c9f39d2c 877 logit("Forwarding port.");
878 }
879
700318f3 880out:
881 signal(SIGINT, handler);
882 enter_raw_mode();
883 if (cmd)
884 xfree(cmd);
47686178 885 if (fwd.listen_host != NULL)
886 xfree(fwd.listen_host);
887 if (fwd.connect_host != NULL)
888 xfree(fwd.connect_host);
700318f3 889}
890
22616013 891/*
892 * Process the characters one by one, call with c==NULL for proto1 case.
893 */
3c0ef626 894static int
22616013 895process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
896 char *buf, int len)
3c0ef626 897{
898 char string[1024];
899 pid_t pid;
900 int bytes = 0;
901 u_int i;
902 u_char ch;
903 char *s;
22616013 904 int *escape_pendingp, escape_char;
905 struct escape_filter_ctx *efc;
3c0ef626 906
22616013 907 if (c == NULL) {
908 escape_pendingp = &escape_pending1;
909 escape_char = escape_char1;
910 } else {
911 if (c->filter_ctx == NULL)
912 return 0;
913 efc = (struct escape_filter_ctx *)c->filter_ctx;
914 escape_pendingp = &efc->escape_pending;
915 escape_char = efc->escape_char;
916 }
917
665a873d 918 if (len <= 0)
919 return (0);
920
921 for (i = 0; i < (u_int)len; i++) {
3c0ef626 922 /* Get one character at a time. */
923 ch = buf[i];
924
22616013 925 if (*escape_pendingp) {
3c0ef626 926 /* We have previously seen an escape character. */
927 /* Clear the flag now. */
22616013 928 *escape_pendingp = 0;
3c0ef626 929
930 /* Process the escaped character. */
931 switch (ch) {
932 case '.':
933 /* Terminate the connection. */
22616013 934 snprintf(string, sizeof string, "%c.\r\n",
935 escape_char);
3c0ef626 936 buffer_append(berr, string, strlen(string));
937
22616013 938 if (c && c->ctl_fd != -1) {
939 chan_read_failed(c);
940 chan_write_failed(c);
941 return 0;
942 } else
943 quit_pending = 1;
3c0ef626 944 return -1;
945
946 case 'Z' - 64:
22616013 947 /* XXX support this for mux clients */
948 if (c && c->ctl_fd != -1) {
949 noescape:
950 snprintf(string, sizeof string,
951 "%c%c escape not available to "
952 "multiplexed sessions\r\n",
953 escape_char, ch);
954 buffer_append(berr, string,
955 strlen(string));
956 continue;
957 }
958 /* Suspend the program. Inform the user */
959 snprintf(string, sizeof string,
960 "%c^Z [suspend ssh]\r\n", escape_char);
3c0ef626 961 buffer_append(berr, string, strlen(string));
962
963 /* Restore terminal modes and suspend. */
964 client_suspend_self(bin, bout, berr);
965
966 /* We have been continued. */
967 continue;
968
0fff78ff 969 case 'B':
970 if (compat20) {
971 snprintf(string, sizeof string,
972 "%cB\r\n", escape_char);
973 buffer_append(berr, string,
974 strlen(string));
975 channel_request_start(session_ident,
976 "break", 0);
977 packet_put_int(1000);
978 packet_send();
979 }
980 continue;
981
3c0ef626 982 case 'R':
983 if (compat20) {
984 if (datafellows & SSH_BUG_NOREKEY)
22616013 985 logit("Server does not "
986 "support re-keying");
3c0ef626 987 else
988 need_rekeying = 1;
989 }
990 continue;
991
992 case '&':
22616013 993 if (c && c->ctl_fd != -1)
994 goto noescape;
3c0ef626 995 /*
22616013 996 * Detach the program (continue to serve
997 * connections, but put in background and no
998 * more new connections).
3c0ef626 999 */
1000 /* Restore tty modes. */
1001 leave_raw_mode();
1002
1003 /* Stop listening for new connections. */
1004 channel_stop_listening();
1005
1006 snprintf(string, sizeof string,
1007 "%c& [backgrounded]\n", escape_char);
1008 buffer_append(berr, string, strlen(string));
1009
1010 /* Fork into background. */
1011 pid = fork();
1012 if (pid < 0) {
1013 error("fork: %.100s", strerror(errno));
1014 continue;
1015 }
1016 if (pid != 0) { /* This is the parent. */
1017 /* The parent just exits. */
1018 exit(0);
1019 }
1020 /* The child continues serving connections. */
1021 if (compat20) {
1022 buffer_append(bin, "\004", 1);
1023 /* fake EOF on stdin */
1024 return -1;
1025 } else if (!stdin_eof) {
1026 /*
22616013 1027 * Sending SSH_CMSG_EOF alone does not
1028 * always appear to be enough. So we
1029 * try to send an EOF character first.
3c0ef626 1030 */
1031 packet_start(SSH_CMSG_STDIN_DATA);
1032 packet_put_string("\004", 1);
1033 packet_send();
1034 /* Close stdin. */
1035 stdin_eof = 1;
1036 if (buffer_len(bin) == 0) {
1037 packet_start(SSH_CMSG_EOF);
1038 packet_send();
1039 }
1040 }
1041 continue;
1042
1043 case '?':
22616013 1044 if (c && c->ctl_fd != -1) {
1045 snprintf(string, sizeof string,
1046"%c?\r\n\
1047Supported escape sequences:\r\n\
1048 %c. - terminate session\r\n\
1049 %cB - send a BREAK to the remote system\r\n\
22616013 1050 %cR - Request rekey (SSH protocol 2 only)\r\n\
1051 %c# - list forwarded connections\r\n\
1052 %c? - this message\r\n\
1053 %c%c - send the escape character by typing it twice\r\n\
1054(Note that escapes are only recognized immediately after newline.)\r\n",
1055 escape_char, escape_char,
1056 escape_char, escape_char,
1057 escape_char, escape_char,
91d9cdd3 1058 escape_char, escape_char);
22616013 1059 } else {
1060 snprintf(string, sizeof string,
3c0ef626 1061"%c?\r\n\
1062Supported escape sequences:\r\n\
22616013 1063 %c. - terminate connection (and any multiplexed sessions)\r\n\
1064 %cB - send a BREAK to the remote system\r\n\
1065 %cC - open a command line\r\n\
1066 %cR - Request rekey (SSH protocol 2 only)\r\n\
1067 %c^Z - suspend ssh\r\n\
1068 %c# - list forwarded connections\r\n\
1069 %c& - background ssh (when waiting for connections to terminate)\r\n\
1070 %c? - this message\r\n\
1071 %c%c - send the escape character by typing it twice\r\n\
3c0ef626 1072(Note that escapes are only recognized immediately after newline.)\r\n",
22616013 1073 escape_char, escape_char,
1074 escape_char, escape_char,
1075 escape_char, escape_char,
1076 escape_char, escape_char,
1077 escape_char, escape_char,
1078 escape_char);
1079 }
3c0ef626 1080 buffer_append(berr, string, strlen(string));
1081 continue;
1082
1083 case '#':
22616013 1084 snprintf(string, sizeof string, "%c#\r\n",
1085 escape_char);
3c0ef626 1086 buffer_append(berr, string, strlen(string));
1087 s = channel_open_message();
1088 buffer_append(berr, s, strlen(s));
1089 xfree(s);
1090 continue;
1091
700318f3 1092 case 'C':
91d9cdd3 1093 if (c && c->ctl_fd != -1)
1094 goto noescape;
700318f3 1095 process_cmdline();
1096 continue;
1097
3c0ef626 1098 default:
1099 if (ch != escape_char) {
1100 buffer_put_char(bin, escape_char);
1101 bytes++;
1102 }
1103 /* Escaped characters fall through here */
1104 break;
1105 }
1106 } else {
1107 /*
22616013 1108 * The previous character was not an escape char.
1109 * Check if this is an escape.
3c0ef626 1110 */
1111 if (last_was_cr && ch == escape_char) {
22616013 1112 /*
1113 * It is. Set the flag and continue to
1114 * next character.
1115 */
1116 *escape_pendingp = 1;
3c0ef626 1117 continue;
1118 }
1119 }
1120
1121 /*
1122 * Normal character. Record whether it was a newline,
1123 * and append it to the buffer.
1124 */
1125 last_was_cr = (ch == '\r' || ch == '\n');
1126 buffer_put_char(bin, ch);
1127 bytes++;
1128 }
1129 return bytes;
1130}
1131
1132static void
9108f8d9 1133client_process_input(fd_set *readset)
3c0ef626 1134{
1135 int len;
b5afdff5 1136 char buf[SSH_IOBUFSZ];
3c0ef626 1137
1138 /* Read input from stdin. */
1139 if (FD_ISSET(fileno(stdin), readset)) {
1140 /* Read as much as possible. */
1141 len = read(fileno(stdin), buf, sizeof(buf));
22616013 1142 if (len < 0 &&
1143 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
3c0ef626 1144 return; /* we'll try again later */
1145 if (len <= 0) {
1146 /*
1147 * Received EOF or error. They are treated
1148 * similarly, except that an error message is printed
1149 * if it was an error condition.
1150 */
1151 if (len < 0) {
22616013 1152 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1153 strerror(errno));
3c0ef626 1154 buffer_append(&stderr_buffer, buf, strlen(buf));
1155 }
1156 /* Mark that we have seen EOF. */
1157 stdin_eof = 1;
1158 /*
1159 * Send an EOF message to the server unless there is
1160 * data in the buffer. If there is data in the
1161 * buffer, no message will be sent now. Code
1162 * elsewhere will send the EOF when the buffer
1163 * becomes empty if stdin_eof is set.
1164 */
1165 if (buffer_len(&stdin_buffer) == 0) {
1166 packet_start(SSH_CMSG_EOF);
1167 packet_send();
1168 }
22616013 1169 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
3c0ef626 1170 /*
1171 * Normal successful read, and no escape character.
1172 * Just append the data to buffer.
1173 */
1174 buffer_append(&stdin_buffer, buf, len);
1175 } else {
1176 /*
22616013 1177 * Normal, successful read. But we have an escape
1178 * character and have to process the characters one
1179 * by one.
3c0ef626 1180 */
22616013 1181 if (process_escapes(NULL, &stdin_buffer,
1182 &stdout_buffer, &stderr_buffer, buf, len) == -1)
3c0ef626 1183 return;
1184 }
1185 }
1186}
1187
1188static void
9108f8d9 1189client_process_output(fd_set *writeset)
3c0ef626 1190{
1191 int len;
1192 char buf[100];
1193
1194 /* Write buffered output to stdout. */
1195 if (FD_ISSET(fileno(stdout), writeset)) {
1196 /* Write as much data as possible. */
1197 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1198 buffer_len(&stdout_buffer));
1199 if (len <= 0) {
22616013 1200 if (errno == EINTR || errno == EAGAIN ||
1201 errno == EWOULDBLOCK)
3c0ef626 1202 len = 0;
1203 else {
1204 /*
1205 * An error or EOF was encountered. Put an
1206 * error message to stderr buffer.
1207 */
22616013 1208 snprintf(buf, sizeof buf,
1209 "write stdout: %.50s\r\n", strerror(errno));
3c0ef626 1210 buffer_append(&stderr_buffer, buf, strlen(buf));
1211 quit_pending = 1;
1212 return;
1213 }
1214 }
1215 /* Consume printed data from the buffer. */
1216 buffer_consume(&stdout_buffer, len);
3c0ef626 1217 }
1218 /* Write buffered output to stderr. */
1219 if (FD_ISSET(fileno(stderr), writeset)) {
1220 /* Write as much data as possible. */
1221 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1222 buffer_len(&stderr_buffer));
1223 if (len <= 0) {
22616013 1224 if (errno == EINTR || errno == EAGAIN ||
1225 errno == EWOULDBLOCK)
3c0ef626 1226 len = 0;
1227 else {
22616013 1228 /*
1229 * EOF or error, but can't even print
1230 * error message.
1231 */
3c0ef626 1232 quit_pending = 1;
1233 return;
1234 }
1235 }
1236 /* Consume printed characters from the buffer. */
1237 buffer_consume(&stderr_buffer, len);
3c0ef626 1238 }
1239}
1240
1241/*
1242 * Get packets from the connection input buffer, and process them as long as
1243 * there are packets available.
1244 *
1245 * Any unknown packets received during the actual
1246 * session cause the session to terminate. This is
1247 * intended to make debugging easier since no
1248 * confirmations are sent. Any compatible protocol
1249 * extensions must be negotiated during the
1250 * preparatory phase.
1251 */
1252
1253static void
1254client_process_buffered_input_packets(void)
1255{
22616013 1256 dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1257 compat20 ? xxx_kex : NULL);
3c0ef626 1258}
1259
1260/* scan buf[] for '~' before sending data to the peer */
1261
22616013 1262/* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1263void *
1264client_new_escape_filter_ctx(int escape_char)
3c0ef626 1265{
22616013 1266 struct escape_filter_ctx *ret;
1267
1268 ret = xmalloc(sizeof(*ret));
1269 ret->escape_pending = 0;
1270 ret->escape_char = escape_char;
1271 return (void *)ret;
1272}
1273
1274/* Free the escape filter context on channel free */
1275void
1276client_filter_cleanup(int cid, void *ctx)
1277{
1278 xfree(ctx);
1279}
1280
1281int
1282client_simple_escape_filter(Channel *c, char *buf, int len)
1283{
1284 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1285 return 0;
1286
1287 return process_escapes(c, &c->input, &c->output, &c->extended,
1288 buf, len);
3c0ef626 1289}
1290
1291static void
1292client_channel_closed(int id, void *arg)
1293{
3c0ef626 1294 channel_cancel_cleanup(id);
1295 session_closed = 1;
cdd66111 1296 leave_raw_mode();
3c0ef626 1297}
1298
1299/*
1300 * Implements the interactive session with the server. This is called after
1301 * the user has been authenticated, and a command has been started on the
1302 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1303 * used as an escape character for terminating or suspending the session.
1304 */
1305
1306int
1307client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1308{
1309 fd_set *readset = NULL, *writeset = NULL;
1310 double start_time, total_time;
c9f39d2c 1311 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
22616013 1312 u_int64_t ibytes, obytes;
c9f39d2c 1313 u_int nalloc = 0;
3c0ef626 1314 char buf[100];
1315
1316 debug("Entering interactive session.");
1317
1318 start_time = get_current_time();
1319
1320 /* Initialize variables. */
22616013 1321 escape_pending1 = 0;
3c0ef626 1322 last_was_cr = 1;
1323 exit_status = -1;
1324 stdin_eof = 0;
1325 buffer_high = 64 * 1024;
1326 connection_in = packet_get_connection_in();
1327 connection_out = packet_get_connection_out();
1328 max_fd = MAX(connection_in, connection_out);
22616013 1329 if (muxserver_sock != -1)
1330 max_fd = MAX(max_fd, muxserver_sock);
3c0ef626 1331
1332 if (!compat20) {
1333 /* enable nonblocking unless tty */
1334 if (!isatty(fileno(stdin)))
1335 set_nonblock(fileno(stdin));
1336 if (!isatty(fileno(stdout)))
1337 set_nonblock(fileno(stdout));
1338 if (!isatty(fileno(stderr)))
1339 set_nonblock(fileno(stderr));
1340 max_fd = MAX(max_fd, fileno(stdin));
1341 max_fd = MAX(max_fd, fileno(stdout));
1342 max_fd = MAX(max_fd, fileno(stderr));
1343 }
3c0ef626 1344 quit_pending = 0;
22616013 1345 escape_char1 = escape_char_arg;
3c0ef626 1346
1347 /* Initialize buffers. */
1348 buffer_init(&stdin_buffer);
1349 buffer_init(&stdout_buffer);
1350 buffer_init(&stderr_buffer);
1351
1352 client_init_dispatch();
1353
6a9b3198 1354 /*
1355 * Set signal handlers, (e.g. to restore non-blocking mode)
1356 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1357 */
996d5e62 1358 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1359 signal(SIGHUP, signal_handler);
6a9b3198 1360 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1361 signal(SIGINT, signal_handler);
1362 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1363 signal(SIGQUIT, signal_handler);
1364 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1365 signal(SIGTERM, signal_handler);
996d5e62 1366 signal(SIGWINCH, window_change_handler);
3c0ef626 1367
1368 if (have_pty)
1369 enter_raw_mode();
1370
1371 if (compat20) {
1372 session_ident = ssh2_chan_id;
22616013 1373 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
3c0ef626 1374 channel_register_filter(session_ident,
22616013 1375 client_simple_escape_filter, NULL,
1376 client_filter_cleanup,
1377 client_new_escape_filter_ctx(escape_char_arg));
3c0ef626 1378 if (session_ident != -1)
1379 channel_register_cleanup(session_ident,
2c06c99b 1380 client_channel_closed, 0);
3c0ef626 1381 } else {
1382 /* Check if we should immediately send eof on stdin. */
1383 client_check_initial_eof_on_stdin();
1384 }
1385
1386 /* Main loop of the client for the interactive session mode. */
1387 while (!quit_pending) {
1388
1389 /* Process buffered packets sent by the server. */
1390 client_process_buffered_input_packets();
1391
1392 if (compat20 && session_closed && !channel_still_open())
1393 break;
1394
1395 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1396
1397 if (rekeying) {
1398 debug("rekeying in progress");
1399 } else {
1400 /*
1401 * Make packets of buffered stdin data, and buffer
1402 * them for sending to the server.
1403 */
1404 if (!compat20)
1405 client_make_packets_from_stdin_data();
1406
1407 /*
1408 * Make packets from buffered channel data, and
1409 * enqueue them for sending to the server.
1410 */
1411 if (packet_not_very_much_data_to_write())
1412 channel_output_poll();
1413
1414 /*
1415 * Check if the window size has changed, and buffer a
1416 * message about it to the server if so.
1417 */
1418 client_check_window_change();
1419
1420 if (quit_pending)
1421 break;
1422 }
1423 /*
1424 * Wait until we have something to do (something becomes
1425 * available on one of the descriptors).
1426 */
1427 max_fd2 = max_fd;
1428 client_wait_until_can_do_something(&readset, &writeset,
1429 &max_fd2, &nalloc, rekeying);
1430
1431 if (quit_pending)
1432 break;
1433
1434 /* Do channel operations unless rekeying in progress. */
1435 if (!rekeying) {
1436 channel_after_select(readset, writeset);
f97edba6 1437
071d8001 1438#ifdef GSSAPI
f97edba6 1439 if (options.gss_renewal_rekey &&
db5d66a5 1440 ssh_gssapi_credentials_updated((Gssctxt *)GSS_C_NO_CONTEXT)) {
f97edba6 1441 debug("credentials updated - forcing rekey");
1442 need_rekeying = 1;
1443 }
071d8001 1444#endif
f97edba6 1445
0fff78ff 1446 if (need_rekeying || packet_need_rekeying()) {
1447 debug("need rekeying");
3c0ef626 1448 xxx_kex->done = 0;
1449 kex_send_kexinit(xxx_kex);
1450 need_rekeying = 0;
1451 }
1452 }
1453
1454 /* Buffer input from the connection. */
1455 client_process_net_input(readset);
1456
c9f39d2c 1457 /* Accept control connections. */
22616013 1458 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1459 if (muxserver_accept_control())
1460 quit_pending = 1;
1461 }
c9f39d2c 1462
3c0ef626 1463 if (quit_pending)
1464 break;
1465
1466 if (!compat20) {
1467 /* Buffer data from stdin */
1468 client_process_input(readset);
1469 /*
1470 * Process output to stdout and stderr. Output to
1471 * the connection is processed elsewhere (above).
1472 */
1473 client_process_output(writeset);
1474 }
1475
22616013 1476 /*
1477 * Send as much buffered packet data as possible to the
1478 * sender.
1479 */
3c0ef626 1480 if (FD_ISSET(connection_out, writeset))
1481 packet_write_poll();
1482 }
1483 if (readset)
1484 xfree(readset);
1485 if (writeset)
1486 xfree(writeset);
1487
1488 /* Terminate the session. */
1489
1490 /* Stop watching for window change. */
996d5e62 1491 signal(SIGWINCH, SIG_DFL);
3c0ef626 1492
b5afdff5 1493 if (compat20) {
1494 packet_start(SSH2_MSG_DISCONNECT);
1495 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1496 packet_put_cstring("disconnected by user");
1497 packet_send();
1498 packet_write_wait();
1499 }
1500
3c0ef626 1501 channel_free_all();
1502
1503 if (have_pty)
1504 leave_raw_mode();
1505
1506 /* restore blocking io */
1507 if (!isatty(fileno(stdin)))
1508 unset_nonblock(fileno(stdin));
1509 if (!isatty(fileno(stdout)))
1510 unset_nonblock(fileno(stdout));
1511 if (!isatty(fileno(stderr)))
1512 unset_nonblock(fileno(stderr));
1513
cdd66111 1514 /*
1515 * If there was no shell or command requested, there will be no remote
1516 * exit status to be returned. In that case, clear error code if the
1517 * connection was deliberately terminated at this end.
1518 */
1519 if (no_shell_flag && received_signal == SIGTERM) {
1520 received_signal = 0;
1521 exit_status = 0;
9cb1827b 1522 }
12408a1b 1523
cdd66111 1524 if (received_signal)
1525 fatal("Killed by signal %d.", (int) received_signal);
1526
3c0ef626 1527 /*
1528 * In interactive mode (with pseudo tty) display a message indicating
1529 * that the connection has been closed.
1530 */
1531 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
22616013 1532 snprintf(buf, sizeof buf,
1533 "Connection to %.64s closed.\r\n", host);
3c0ef626 1534 buffer_append(&stderr_buffer, buf, strlen(buf));
1535 }
1536
1537 /* Output any buffered data for stdout. */
1538 while (buffer_len(&stdout_buffer) > 0) {
1539 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1540 buffer_len(&stdout_buffer));
1541 if (len <= 0) {
1542 error("Write failed flushing stdout buffer.");
1543 break;
1544 }
1545 buffer_consume(&stdout_buffer, len);
3c0ef626 1546 }
1547
1548 /* Output any buffered data for stderr. */
1549 while (buffer_len(&stderr_buffer) > 0) {
1550 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1551 buffer_len(&stderr_buffer));
1552 if (len <= 0) {
1553 error("Write failed flushing stderr buffer.");
1554 break;
1555 }
1556 buffer_consume(&stderr_buffer, len);
3c0ef626 1557 }
1558
1559 /* Clear and free any buffers. */
1560 memset(buf, 0, sizeof(buf));
1561 buffer_free(&stdin_buffer);
1562 buffer_free(&stdout_buffer);
1563 buffer_free(&stderr_buffer);
1564
1565 /* Report bytes transferred, and transfer rates. */
1566 total_time = get_current_time() - start_time;
22616013 1567 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1568 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1569 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1570 obytes, ibytes, total_time);
3c0ef626 1571 if (total_time > 0)
22616013 1572 verbose("Bytes per second: sent %.1f, received %.1f",
1573 obytes / total_time, ibytes / total_time);
3c0ef626 1574 /* Return the exit status of the program. */
1575 debug("Exit status %d", exit_status);
1576 return exit_status;
1577}
1578
1579/*********/
1580
1581static void
e9a17296 1582client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
3c0ef626 1583{
1584 u_int data_len;
1585 char *data = packet_get_string(&data_len);
e9a17296 1586 packet_check_eom();
3c0ef626 1587 buffer_append(&stdout_buffer, data, data_len);
1588 memset(data, 0, data_len);
1589 xfree(data);
1590}
1591static void
e9a17296 1592client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
3c0ef626 1593{
1594 u_int data_len;
1595 char *data = packet_get_string(&data_len);
e9a17296 1596 packet_check_eom();
3c0ef626 1597 buffer_append(&stderr_buffer, data, data_len);
1598 memset(data, 0, data_len);
1599 xfree(data);
1600}
1601static void
e9a17296 1602client_input_exit_status(int type, u_int32_t seq, void *ctxt)
3c0ef626 1603{
3c0ef626 1604 exit_status = packet_get_int();
e9a17296 1605 packet_check_eom();
3c0ef626 1606 /* Acknowledge the exit. */
1607 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1608 packet_send();
1609 /*
1610 * Must wait for packet to be sent since we are
1611 * exiting the loop.
1612 */
1613 packet_write_wait();
1614 /* Flag that we want to exit. */
1615 quit_pending = 1;
1616}
cdd66111 1617static void
1618client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1619{
1620 Channel *c = NULL;
1621 int remote_id, sock;
1622
1623 /* Read the remote channel number from the message. */
1624 remote_id = packet_get_int();
1625 packet_check_eom();
1626
1627 /*
1628 * Get a connection to the local authentication agent (this may again
1629 * get forwarded).
1630 */
1631 sock = ssh_get_authentication_socket();
1632
1633 /*
1634 * If we could not connect the agent, send an error message back to
1635 * the server. This should never happen unless the agent dies,
1636 * because authentication forwarding is only enabled if we have an
1637 * agent.
1638 */
1639 if (sock >= 0) {
1640 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1641 -1, 0, 0, 0, "authentication agent connection", 1);
1642 c->remote_id = remote_id;
1643 c->force_drain = 1;
1644 }
1645 if (c == NULL) {
1646 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1647 packet_put_int(remote_id);
1648 } else {
1649 /* Send a confirmation to the remote host. */
1650 debug("Forwarding authentication connection.");
1651 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1652 packet_put_int(remote_id);
1653 packet_put_int(c->self);
1654 }
1655 packet_send();
1656}
3c0ef626 1657
1658static Channel *
1659client_request_forwarded_tcpip(const char *request_type, int rchan)
1660{
41b2f314 1661 Channel *c = NULL;
3c0ef626 1662 char *listen_address, *originator_address;
91d9cdd3 1663 u_short listen_port, originator_port;
3c0ef626 1664
1665 /* Get rest of the packet */
1666 listen_address = packet_get_string(NULL);
1667 listen_port = packet_get_int();
1668 originator_address = packet_get_string(NULL);
1669 originator_port = packet_get_int();
e9a17296 1670 packet_check_eom();
3c0ef626 1671
22616013 1672 debug("client_request_forwarded_tcpip: listen %s port %d, "
1673 "originator %s port %d", listen_address, listen_port,
1674 originator_address, originator_port);
1675
1676 c = channel_connect_by_listen_address(listen_port,
1677 "forwarded-tcpip", originator_address);
3c0ef626 1678
3c0ef626 1679 xfree(originator_address);
1680 xfree(listen_address);
1681 return c;
1682}
1683
41b2f314 1684static Channel *
3c0ef626 1685client_request_x11(const char *request_type, int rchan)
1686{
1687 Channel *c = NULL;
1688 char *originator;
91d9cdd3 1689 u_short originator_port;
3c0ef626 1690 int sock;
1691
1692 if (!options.forward_x11) {
1693 error("Warning: ssh server tried X11 forwarding.");
22616013 1694 error("Warning: this is probably a break-in attempt by a "
1695 "malicious server.");
3c0ef626 1696 return NULL;
1697 }
1698 originator = packet_get_string(NULL);
1699 if (datafellows & SSH_BUG_X11FWD) {
1700 debug2("buggy server: x11 request w/o originator_port");
1701 originator_port = 0;
1702 } else {
1703 originator_port = packet_get_int();
1704 }
e9a17296 1705 packet_check_eom();
3c0ef626 1706 /* XXX check permission */
1707 debug("client_request_x11: request from %s %d", originator,
1708 originator_port);
1709 xfree(originator);
1710 sock = x11_connect_display();
1711 if (sock < 0)
1712 return NULL;
76d45d2f 1713 /* again is this really necessary for X11? */
1714 if (options.hpn_disabled)
3c0ef626 1715 c = channel_new("x11",
1716 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
0fff78ff 1717 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
76d45d2f 1718 else
1719 c = channel_new("x11",
1720 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1721 options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
3c0ef626 1722 c->force_drain = 1;
1723 return c;
1724}
1725
41b2f314 1726static Channel *
3c0ef626 1727client_request_agent(const char *request_type, int rchan)
1728{
1729 Channel *c = NULL;
1730 int sock;
1731
1732 if (!options.forward_agent) {
1733 error("Warning: ssh server tried agent forwarding.");
22616013 1734 error("Warning: this is probably a break-in attempt by a "
1735 "malicious server.");
3c0ef626 1736 return NULL;
1737 }
799ae497 1738 sock = ssh_get_authentication_socket();
3c0ef626 1739 if (sock < 0)
1740 return NULL;
76d45d2f 1741 if (options.hpn_disabled)
3c0ef626 1742 c = channel_new("authentication agent connection",
1743 SSH_CHANNEL_OPEN, sock, sock, -1,
76d45d2f 1744 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1745 "authentication agent connection", 1);
1746 else
1747 c = channel_new("authentication agent connection",
1748 SSH_CHANNEL_OPEN, sock, sock, -1,
1749 options.hpn_buffer_size, options.hpn_buffer_size, 0,
0fff78ff 1750 "authentication agent connection", 1);
3c0ef626 1751 c->force_drain = 1;
1752 return c;
1753}
1754
d4487008 1755int
1756client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1757{
1758 Channel *c;
1759 int fd;
1760
1761 if (tun_mode == SSH_TUNMODE_NO)
1762 return 0;
1763
1764 if (!compat20) {
91d9cdd3 1765 error("Tunnel forwarding is not supported for protocol 1");
d4487008 1766 return -1;
1767 }
1768
1769 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1770
1771 /* Open local tunnel device */
1772 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1773 error("Tunnel device open failed.");
1774 return -1;
1775 }
1776
76d45d2f 1777 if(options.hpn_disabled)
1778 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1779 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1780 0, "tun", 1);
1781 else
d4487008 1782 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
76d45d2f 1783 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1784 0, "tun", 1);
d4487008 1785 c->datagram = 1;
1786
76d45d2f 1787
1788
d4487008 1789#if defined(SSH_TUN_FILTER)
1790 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1791 channel_register_filter(c->self, sys_tun_infilter,
22616013 1792 sys_tun_outfilter, NULL, NULL);
d4487008 1793#endif
1794
1795 packet_start(SSH2_MSG_CHANNEL_OPEN);
1796 packet_put_cstring("tun@openssh.com");
1797 packet_put_int(c->self);
1798 packet_put_int(c->local_window_max);
1799 packet_put_int(c->local_maxpacket);
1800 packet_put_int(tun_mode);
1801 packet_put_int(remote_tun);
1802 packet_send();
1803
1804 return 0;
1805}
1806
3c0ef626 1807/* XXXX move to generic input handler */
1808static void
e9a17296 1809client_input_channel_open(int type, u_int32_t seq, void *ctxt)
3c0ef626 1810{
1811 Channel *c = NULL;
1812 char *ctype;
3c0ef626 1813 int rchan;
680cee3b 1814 u_int rmaxpack, rwindow, len;
3c0ef626 1815
1816 ctype = packet_get_string(&len);
1817 rchan = packet_get_int();
1818 rwindow = packet_get_int();
1819 rmaxpack = packet_get_int();
1820
1821 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1822 ctype, rchan, rwindow, rmaxpack);
1823
1824 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1825 c = client_request_forwarded_tcpip(ctype, rchan);
1826 } else if (strcmp(ctype, "x11") == 0) {
1827 c = client_request_x11(ctype, rchan);
1828 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1829 c = client_request_agent(ctype, rchan);
1830 }
1831/* XXX duplicate : */
1832 if (c != NULL) {
1833 debug("confirm %s", ctype);
1834 c->remote_id = rchan;
1835 c->remote_window = rwindow;
1836 c->remote_maxpacket = rmaxpack;
1837 if (c->type != SSH_CHANNEL_CONNECTING) {
1838 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1839 packet_put_int(c->remote_id);
1840 packet_put_int(c->self);
1841 packet_put_int(c->local_window);
1842 packet_put_int(c->local_maxpacket);
1843 packet_send();
1844 }
1845 } else {
1846 debug("failure %s", ctype);
1847 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1848 packet_put_int(rchan);
1849 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1850 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1851 packet_put_cstring("open failed");
1852 packet_put_cstring("");
1853 }
1854 packet_send();
1855 }
1856 xfree(ctype);
1857}
1858static void
e9a17296 1859client_input_channel_req(int type, u_int32_t seq, void *ctxt)
3c0ef626 1860{
1861 Channel *c = NULL;
c9f39d2c 1862 int exitval, id, reply, success = 0;
3c0ef626 1863 char *rtype;
1864
1865 id = packet_get_int();
1866 rtype = packet_get_string(NULL);
1867 reply = packet_get_char();
1868
1869 debug("client_input_channel_req: channel %d rtype %s reply %d",
1870 id, rtype, reply);
1871
c9f39d2c 1872 if (id == -1) {
1873 error("client_input_channel_req: request for channel -1");
1874 } else if ((c = channel_lookup(id)) == NULL) {
22616013 1875 error("client_input_channel_req: channel %d: "
1876 "unknown channel", id);
1877 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1878 packet_check_eom();
1879 chan_rcvd_eow(c);
3c0ef626 1880 } else if (strcmp(rtype, "exit-status") == 0) {
c9f39d2c 1881 exitval = packet_get_int();
1882 if (id == session_ident) {
1883 success = 1;
1884 exit_status = exitval;
1885 } else if (c->ctl_fd == -1) {
1886 error("client_input_channel_req: unexpected channel %d",
1887 session_ident);
1888 } else {
1889 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1890 success = 1;
1891 }
e9a17296 1892 packet_check_eom();
3c0ef626 1893 }
1894 if (reply) {
1895 packet_start(success ?
1896 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
91d9cdd3 1897 packet_put_int(c->remote_id);
3c0ef626 1898 packet_send();
1899 }
1900 xfree(rtype);
1901}
e9a17296 1902static void
1903client_input_global_request(int type, u_int32_t seq, void *ctxt)
1904{
1905 char *rtype;
1906 int want_reply;
1907 int success = 0;
1908
1909 rtype = packet_get_string(NULL);
1910 want_reply = packet_get_char();
cdd66111 1911 debug("client_input_global_request: rtype %s want_reply %d",
1912 rtype, want_reply);
e9a17296 1913 if (want_reply) {
1914 packet_start(success ?
1915 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1916 packet_send();
1917 packet_write_wait();
1918 }
1919 xfree(rtype);
1920}
3c0ef626 1921
c9f39d2c 1922void
1923client_session2_setup(int id, int want_tty, int want_subsystem,
22616013 1924 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
c9f39d2c 1925{
1926 int len;
996d5e62 1927 Channel *c = NULL;
c9f39d2c 1928
1929 debug2("%s: id %d", __func__, id);
1930
996d5e62 1931 if ((c = channel_lookup(id)) == NULL)
1932 fatal("client_session2_setup: channel %d: unknown channel", id);
1933
c9f39d2c 1934 if (want_tty) {
1935 struct winsize ws;
c9f39d2c 1936
1937 /* Store window size in the packet. */
1938 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1939 memset(&ws, 0, sizeof(ws));
1940
22616013 1941 channel_request_start(id, "pty-req", 1);
1942 client_expect_confirm(id, "PTY allocation", 0);
c9f39d2c 1943 packet_put_cstring(term != NULL ? term : "");
9108f8d9 1944 packet_put_int((u_int)ws.ws_col);
1945 packet_put_int((u_int)ws.ws_row);
1946 packet_put_int((u_int)ws.ws_xpixel);
1947 packet_put_int((u_int)ws.ws_ypixel);
22616013 1948 if (tiop == NULL)
1949 tiop = get_saved_tio();
1950 tty_make_modes(-1, tiop);
c9f39d2c 1951 packet_send();
1952 /* XXX wait for reply */
996d5e62 1953 c->client_tty = 1;
c9f39d2c 1954 }
1955
1956 /* Transfer any environment variables from client to server */
1957 if (options.num_send_env != 0 && env != NULL) {
1958 int i, j, matched;
1959 char *name, *val;
1960
1961 debug("Sending environment.");
1962 for (i = 0; env[i] != NULL; i++) {
1963 /* Split */
1964 name = xstrdup(env[i]);
1965 if ((val = strchr(name, '=')) == NULL) {
2c06c99b 1966 xfree(name);
c9f39d2c 1967 continue;
1968 }
1969 *val++ = '\0';
1970
1971 matched = 0;
1972 for (j = 0; j < options.num_send_env; j++) {
1973 if (match_pattern(name, options.send_env[j])) {
1974 matched = 1;
1975 break;
1976 }
1977 }
1978 if (!matched) {
1979 debug3("Ignored env %s", name);
2c06c99b 1980 xfree(name);
c9f39d2c 1981 continue;
1982 }
1983
1984 debug("Sending env %s = %s", name, val);
1985 channel_request_start(id, "env", 0);
1986 packet_put_cstring(name);
1987 packet_put_cstring(val);
1988 packet_send();
2c06c99b 1989 xfree(name);
c9f39d2c 1990 }
1991 }
1992
1993 len = buffer_len(cmd);
1994 if (len > 0) {
1995 if (len > 900)
1996 len = 900;
1997 if (want_subsystem) {
22616013 1998 debug("Sending subsystem: %.*s",
1999 len, (u_char*)buffer_ptr(cmd));
2000 channel_request_start(id, "subsystem", 1);
2001 client_expect_confirm(id, "subsystem", 1);
c9f39d2c 2002 } else {
22616013 2003 debug("Sending command: %.*s",
2004 len, (u_char*)buffer_ptr(cmd));
2005 channel_request_start(id, "exec", 1);
2006 client_expect_confirm(id, "exec", 1);
c9f39d2c 2007 }
2008 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2009 packet_send();
2010 } else {
22616013 2011 channel_request_start(id, "shell", 1);
2012 client_expect_confirm(id, "shell", 1);
c9f39d2c 2013 packet_send();
2014 }
2015}
2016
3c0ef626 2017static void
2018client_init_dispatch_20(void)
2019{
2020 dispatch_init(&dispatch_protocol_error);
700318f3 2021
3c0ef626 2022 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2023 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2024 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2025 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2026 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2027 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2028 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2029 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2030 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
22616013 2031 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2032 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
e9a17296 2033 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
3c0ef626 2034
2035 /* rekeying */
2036 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
700318f3 2037
2038 /* global request reply messages */
2039 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2040 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
3c0ef626 2041}
22616013 2042
3c0ef626 2043static void
2044client_init_dispatch_13(void)
2045{
2046 dispatch_init(NULL);
2047 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2048 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2049 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2050 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2051 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2052 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2053 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2054 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2055 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2056
2057 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
cdd66111 2058 &client_input_agent_open : &deny_input_open);
3c0ef626 2059 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2060 &x11_input_open : &deny_input_open);
2061}
22616013 2062
3c0ef626 2063static void
2064client_init_dispatch_15(void)
2065{
2066 client_init_dispatch_13();
2067 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2068 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2069}
22616013 2070
3c0ef626 2071static void
2072client_init_dispatch(void)
2073{
2074 if (compat20)
2075 client_init_dispatch_20();
2076 else if (compat13)
2077 client_init_dispatch_13();
2078 else
2079 client_init_dispatch_15();
2080}
cdd66111 2081
2082/* client specific fatal cleanup */
2083void
2084cleanup_exit(int i)
2085{
2086 leave_raw_mode();
2087 leave_non_blocking();
22616013 2088 if (options.control_path != NULL && muxserver_sock != -1)
c9f39d2c 2089 unlink(options.control_path);
cdd66111 2090 _exit(i);
2091}
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