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91d9cdd3 1/* $OpenBSD: clientloop.c,v 1.209 2009/02/12 03:00:56 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
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"
3c0ef626 112
f97edba6 113#ifdef GSSAPI
114#include "ssh-gss.h"
115#endif
116
3c0ef626 117/* import options */
118extern Options options;
119
120/* Flag indicating that stdin should be redirected from /dev/null. */
121extern int stdin_null_flag;
122
cdd66111 123/* Flag indicating that no shell has been requested */
124extern int no_shell_flag;
125
c9f39d2c 126/* Control socket */
22616013 127extern int muxserver_sock;
c9f39d2c 128
3c0ef626 129/*
130 * Name of the host we are connecting to. This is the name given on the
131 * command line, or the HostName specified for the user-supplied name in a
132 * configuration file.
133 */
134extern char *host;
135
136/*
137 * Flag to indicate that we have received a window change signal which has
138 * not yet been processed. This will cause a message indicating the new
139 * window size to be sent to the server a little later. This is volatile
140 * because this is updated in a signal handler.
141 */
e9a17296 142static volatile sig_atomic_t received_window_change_signal = 0;
143static volatile sig_atomic_t received_signal = 0;
3c0ef626 144
2c06c99b 145/* Flag indicating whether the user's terminal is in non-blocking mode. */
3c0ef626 146static int in_non_blocking_mode = 0;
147
148/* Common data for the client loop code. */
9108f8d9 149static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
22616013 150static int escape_char1; /* Escape character. (proto1 only) */
151static int escape_pending1; /* Last character was an escape (proto1 only) */
3c0ef626 152static int last_was_cr; /* Last character was a newline. */
22616013 153static int exit_status; /* Used to store the command exit status. */
154static int stdin_eof; /* EOF has been encountered on stderr. */
3c0ef626 155static Buffer stdin_buffer; /* Buffer for stdin data. */
156static Buffer stdout_buffer; /* Buffer for stdout data. */
157static Buffer stderr_buffer; /* Buffer for stderr data. */
3c0ef626 158static u_int buffer_high;/* Soft max buffer size. */
159static int connection_in; /* Connection to server (input). */
160static int connection_out; /* Connection to server (output). */
161static int need_rekeying; /* Set to non-zero if rekeying is requested. */
162static int session_closed = 0; /* In SSH2: login session closed. */
163
164static void client_init_dispatch(void);
165int session_ident = -1;
166
22616013 167/* Track escape per proto2 channel */
168struct escape_filter_ctx {
169 int escape_pending;
170 int escape_char;
c9f39d2c 171};
172
22616013 173/* Context for channel confirmation replies */
174struct channel_reply_ctx {
175 const char *request_type;
176 int id, do_close;
177};
178
179/* Global request success/failure callbacks */
180struct global_confirm {
181 TAILQ_ENTRY(global_confirm) entry;
182 global_confirm_cb *cb;
183 void *ctx;
184 int ref_count;
185};
186TAILQ_HEAD(global_confirms, global_confirm);
187static struct global_confirms global_confirms =
188 TAILQ_HEAD_INITIALIZER(global_confirms);
189
3c0ef626 190/*XXX*/
191extern Kex *xxx_kex;
192
c9f39d2c 193void ssh_process_session2_setup(int, int, int, Buffer *);
194
3c0ef626 195/* Restores stdin to blocking mode. */
196
197static void
198leave_non_blocking(void)
199{
200 if (in_non_blocking_mode) {
c9f39d2c 201 unset_nonblock(fileno(stdin));
3c0ef626 202 in_non_blocking_mode = 0;
3c0ef626 203 }
204}
205
206/* Puts stdin terminal in non-blocking mode. */
207
208static void
209enter_non_blocking(void)
210{
211 in_non_blocking_mode = 1;
c9f39d2c 212 set_nonblock(fileno(stdin));
3c0ef626 213}
214
215/*
216 * Signal handler for the window change signal (SIGWINCH). This just sets a
217 * flag indicating that the window has changed.
218 */
9108f8d9 219/*ARGSUSED */
3c0ef626 220static void
221window_change_handler(int sig)
222{
223 received_window_change_signal = 1;
224 signal(SIGWINCH, window_change_handler);
225}
226
227/*
228 * Signal handler for signals that cause the program to terminate. These
229 * signals must be trapped to restore terminal modes.
230 */
9108f8d9 231/*ARGSUSED */
3c0ef626 232static void
233signal_handler(int sig)
234{
235 received_signal = sig;
236 quit_pending = 1;
237}
238
239/*
240 * Returns current time in seconds from Jan 1, 1970 with the maximum
241 * available resolution.
242 */
243
244static double
245get_current_time(void)
246{
247 struct timeval tv;
248 gettimeofday(&tv, NULL);
249 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
250}
251
665a873d 252#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
253void
254client_x11_get_proto(const char *display, const char *xauth_path,
255 u_int trusted, char **_proto, char **_data)
256{
257 char cmd[1024];
258 char line[512];
259 char xdisplay[512];
260 static char proto[512], data[512];
261 FILE *f;
262 int got_data = 0, generated = 0, do_unlink = 0, i;
263 char *xauthdir, *xauthfile;
264 struct stat st;
265
266 xauthdir = xauthfile = NULL;
267 *_proto = proto;
268 *_data = data;
269 proto[0] = data[0] = '\0';
270
271 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
272 debug("No xauth program.");
273 } else {
274 if (display == NULL) {
275 debug("x11_get_proto: DISPLAY not set");
276 return;
277 }
278 /*
279 * Handle FamilyLocal case where $DISPLAY does
280 * not match an authorization entry. For this we
281 * just try "xauth list unix:displaynum.screennum".
282 * XXX: "localhost" match to determine FamilyLocal
283 * is not perfect.
284 */
285 if (strncmp(display, "localhost:", 10) == 0) {
286 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
287 display + 10);
288 display = xdisplay;
289 }
290 if (trusted == 0) {
291 xauthdir = xmalloc(MAXPATHLEN);
292 xauthfile = xmalloc(MAXPATHLEN);
293 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
294 if (mkdtemp(xauthdir) != NULL) {
295 do_unlink = 1;
296 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
297 xauthdir);
298 snprintf(cmd, sizeof(cmd),
299 "%s -f %s generate %s " SSH_X11_PROTO
300 " untrusted timeout 1200 2>" _PATH_DEVNULL,
301 xauth_path, xauthfile, display);
302 debug2("x11_get_proto: %s", cmd);
303 if (system(cmd) == 0)
304 generated = 1;
305 }
306 }
d4487008 307
308 /*
309 * When in untrusted mode, we read the cookie only if it was
310 * successfully generated as an untrusted one in the step
311 * above.
312 */
313 if (trusted || generated) {
314 snprintf(cmd, sizeof(cmd),
315 "%s %s%s list %s 2>" _PATH_DEVNULL,
316 xauth_path,
317 generated ? "-f " : "" ,
318 generated ? xauthfile : "",
319 display);
320 debug2("x11_get_proto: %s", cmd);
321 f = popen(cmd, "r");
322 if (f && fgets(line, sizeof(line), f) &&
323 sscanf(line, "%*s %511s %511s", proto, data) == 2)
324 got_data = 1;
325 if (f)
326 pclose(f);
327 } else
328 error("Warning: untrusted X11 forwarding setup failed: "
329 "xauth key data not generated");
665a873d 330 }
331
332 if (do_unlink) {
333 unlink(xauthfile);
334 rmdir(xauthdir);
335 }
336 if (xauthdir)
337 xfree(xauthdir);
338 if (xauthfile)
339 xfree(xauthfile);
340
341 /*
342 * If we didn't get authentication data, just make up some
343 * data. The forwarding code will check the validity of the
344 * response anyway, and substitute this data. The X11
345 * server, however, will ignore this fake data and use
346 * whatever authentication mechanisms it was using otherwise
347 * for the local connection.
348 */
349 if (!got_data) {
350 u_int32_t rnd = 0;
351
352 logit("Warning: No xauth data; "
353 "using fake authentication data for X11 forwarding.");
354 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
355 for (i = 0; i < 16; i++) {
356 if (i % 4 == 0)
357 rnd = arc4random();
358 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
359 rnd & 0xff);
360 rnd >>= 8;
361 }
362 }
363}
364
3c0ef626 365/*
366 * This is called when the interactive is entered. This checks if there is
367 * an EOF coming on stdin. We must check this explicitly, as select() does
368 * not appear to wake up when redirecting from /dev/null.
369 */
370
371static void
372client_check_initial_eof_on_stdin(void)
373{
374 int len;
375 char buf[1];
376
377 /*
378 * If standard input is to be "redirected from /dev/null", we simply
379 * mark that we have seen an EOF and send an EOF message to the
380 * server. Otherwise, we try to read a single character; it appears
381 * that for some files, such /dev/null, select() never wakes up for
382 * read for this descriptor, which means that we never get EOF. This
383 * way we will get the EOF if stdin comes from /dev/null or similar.
384 */
385 if (stdin_null_flag) {
386 /* Fake EOF on stdin. */
387 debug("Sending eof.");
388 stdin_eof = 1;
389 packet_start(SSH_CMSG_EOF);
390 packet_send();
391 } else {
392 enter_non_blocking();
393
394 /* Check for immediate EOF on stdin. */
395 len = read(fileno(stdin), buf, 1);
396 if (len == 0) {
22616013 397 /*
398 * EOF. Record that we have seen it and send
399 * EOF to server.
400 */
3c0ef626 401 debug("Sending eof.");
402 stdin_eof = 1;
403 packet_start(SSH_CMSG_EOF);
404 packet_send();
405 } else if (len > 0) {
406 /*
407 * Got data. We must store the data in the buffer,
408 * and also process it as an escape character if
409 * appropriate.
410 */
22616013 411 if ((u_char) buf[0] == escape_char1)
412 escape_pending1 = 1;
3c0ef626 413 else
414 buffer_append(&stdin_buffer, buf, 1);
415 }
416 leave_non_blocking();
417 }
418}
419
420
421/*
422 * Make packets from buffered stdin data, and buffer them for sending to the
423 * connection.
424 */
425
426static void
427client_make_packets_from_stdin_data(void)
428{
429 u_int len;
430
431 /* Send buffered stdin data to the server. */
432 while (buffer_len(&stdin_buffer) > 0 &&
e9a17296 433 packet_not_very_much_data_to_write()) {
3c0ef626 434 len = buffer_len(&stdin_buffer);
435 /* Keep the packets at reasonable size. */
436 if (len > packet_get_maxsize())
437 len = packet_get_maxsize();
438 packet_start(SSH_CMSG_STDIN_DATA);
439 packet_put_string(buffer_ptr(&stdin_buffer), len);
440 packet_send();
441 buffer_consume(&stdin_buffer, len);
3c0ef626 442 /* If we have a pending EOF, send it now. */
443 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
444 packet_start(SSH_CMSG_EOF);
445 packet_send();
446 }
447 }
448}
449
450/*
451 * Checks if the client window has changed, and sends a packet about it to
452 * the server if so. The actual change is detected elsewhere (by a software
453 * interrupt on Unix); this just checks the flag and sends a message if
454 * appropriate.
455 */
456
457static void
458client_check_window_change(void)
459{
460 struct winsize ws;
461
462 if (! received_window_change_signal)
463 return;
464 /** XXX race */
465 received_window_change_signal = 0;
466
3c0ef626 467 debug2("client_check_window_change: changed");
468
469 if (compat20) {
c9f39d2c 470 channel_send_window_changes();
3c0ef626 471 } else {
c9f39d2c 472 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
473 return;
3c0ef626 474 packet_start(SSH_CMSG_WINDOW_SIZE);
9108f8d9 475 packet_put_int((u_int)ws.ws_row);
476 packet_put_int((u_int)ws.ws_col);
477 packet_put_int((u_int)ws.ws_xpixel);
478 packet_put_int((u_int)ws.ws_ypixel);
3c0ef626 479 packet_send();
480 }
481}
482
cdd66111 483static void
484client_global_request_reply(int type, u_int32_t seq, void *ctxt)
485{
22616013 486 struct global_confirm *gc;
487
488 if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
489 return;
490 if (gc->cb != NULL)
491 gc->cb(type, seq, gc->ctx);
492 if (--gc->ref_count <= 0) {
493 TAILQ_REMOVE(&global_confirms, gc, entry);
494 bzero(gc, sizeof(*gc));
495 xfree(gc);
496 }
497
47686178 498 keep_alive_timeouts = 0;
cdd66111 499}
500
501static void
502server_alive_check(void)
503{
47686178 504 if (++keep_alive_timeouts > options.server_alive_count_max) {
ff7ec503 505 logit("Timeout, server not responding.");
506 cleanup_exit(255);
507 }
cdd66111 508 packet_start(SSH2_MSG_GLOBAL_REQUEST);
509 packet_put_cstring("keepalive@openssh.com");
510 packet_put_char(1); /* boolean: want reply */
511 packet_send();
22616013 512 /* Insert an empty placeholder to maintain ordering */
513 client_register_global_confirm(NULL, NULL);
cdd66111 514}
515
3c0ef626 516/*
517 * Waits until the client can do something (some data becomes available on
518 * one of the file descriptors).
519 */
3c0ef626 520static void
521client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
c9f39d2c 522 int *maxfdp, u_int *nallocp, int rekeying)
3c0ef626 523{
cdd66111 524 struct timeval tv, *tvp;
525 int ret;
526
3c0ef626 527 /* Add any selections by the channel mechanism. */
528 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
529
530 if (!compat20) {
531 /* Read from the connection, unless our buffers are full. */
532 if (buffer_len(&stdout_buffer) < buffer_high &&
533 buffer_len(&stderr_buffer) < buffer_high &&
534 channel_not_very_much_buffered_data())
535 FD_SET(connection_in, *readsetp);
536 /*
537 * Read from stdin, unless we have seen EOF or have very much
538 * buffered data to send to the server.
539 */
540 if (!stdin_eof && packet_not_very_much_data_to_write())
541 FD_SET(fileno(stdin), *readsetp);
542
543 /* Select stdout/stderr if have data in buffer. */
544 if (buffer_len(&stdout_buffer) > 0)
545 FD_SET(fileno(stdout), *writesetp);
546 if (buffer_len(&stderr_buffer) > 0)
547 FD_SET(fileno(stderr), *writesetp);
548 } else {
549 /* channel_prepare_select could have closed the last channel */
550 if (session_closed && !channel_still_open() &&
551 !packet_have_data_to_write()) {
552 /* clear mask since we did not call select() */
553 memset(*readsetp, 0, *nallocp);
554 memset(*writesetp, 0, *nallocp);
555 return;
556 } else {
557 FD_SET(connection_in, *readsetp);
558 }
559 }
560
561 /* Select server connection if have data to write to the server. */
562 if (packet_have_data_to_write())
563 FD_SET(connection_out, *writesetp);
564
22616013 565 if (muxserver_sock != -1)
566 FD_SET(muxserver_sock, *readsetp);
c9f39d2c 567
3c0ef626 568 /*
569 * Wait for something to happen. This will suspend the process until
570 * some selected descriptor can be read, written, or has some other
cdd66111 571 * event pending.
3c0ef626 572 */
573
cdd66111 574 if (options.server_alive_interval == 0 || !compat20)
575 tvp = NULL;
c9f39d2c 576 else {
cdd66111 577 tv.tv_sec = options.server_alive_interval;
578 tv.tv_usec = 0;
579 tvp = &tv;
580 }
581 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
582 if (ret < 0) {
3c0ef626 583 char buf[100];
584
585 /*
586 * We have to clear the select masks, because we return.
587 * We have to return, because the mainloop checks for the flags
588 * set by the signal handlers.
589 */
590 memset(*readsetp, 0, *nallocp);
591 memset(*writesetp, 0, *nallocp);
592
593 if (errno == EINTR)
594 return;
595 /* Note: we might still have data in the buffers. */
596 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
597 buffer_append(&stderr_buffer, buf, strlen(buf));
598 quit_pending = 1;
cdd66111 599 } else if (ret == 0)
600 server_alive_check();
3c0ef626 601}
602
603static void
604client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
605{
3c0ef626 606 /* Flush stdout and stderr buffers. */
607 if (buffer_len(bout) > 0)
22616013 608 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
609 buffer_len(bout));
3c0ef626 610 if (buffer_len(berr) > 0)
22616013 611 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
612 buffer_len(berr));
3c0ef626 613
614 leave_raw_mode();
615
616 /*
617 * Free (and clear) the buffer to reduce the amount of data that gets
618 * written to swap.
619 */
620 buffer_free(bin);
621 buffer_free(bout);
622 buffer_free(berr);
623
3c0ef626 624 /* Send the suspend signal to the program itself. */
625 kill(getpid(), SIGTSTP);
626
996d5e62 627 /* Reset window sizes in case they have changed */
628 received_window_change_signal = 1;
3c0ef626 629
630 /* OK, we have been continued by the user. Reinitialize buffers. */
631 buffer_init(bin);
632 buffer_init(bout);
633 buffer_init(berr);
634
635 enter_raw_mode();
636}
637
638static void
9108f8d9 639client_process_net_input(fd_set *readset)
3c0ef626 640{
641 int len;
642 char buf[8192];
643
644 /*
645 * Read input from the server, and add any such data to the buffer of
646 * the packet subsystem.
647 */
648 if (FD_ISSET(connection_in, readset)) {
649 /* Read as much as possible. */
650 len = read(connection_in, buf, sizeof(buf));
651 if (len == 0) {
22616013 652 /*
653 * Received EOF. The remote host has closed the
654 * connection.
655 */
656 snprintf(buf, sizeof buf,
657 "Connection to %.300s closed by remote host.\r\n",
658 host);
3c0ef626 659 buffer_append(&stderr_buffer, buf, strlen(buf));
660 quit_pending = 1;
661 return;
662 }
663 /*
664 * There is a kernel bug on Solaris that causes select to
665 * sometimes wake up even though there is no data available.
666 */
22616013 667 if (len < 0 &&
668 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
3c0ef626 669 len = 0;
670
671 if (len < 0) {
22616013 672 /*
673 * An error has encountered. Perhaps there is a
674 * network problem.
675 */
676 snprintf(buf, sizeof buf,
677 "Read from remote host %.300s: %.100s\r\n",
678 host, strerror(errno));
3c0ef626 679 buffer_append(&stderr_buffer, buf, strlen(buf));
680 quit_pending = 1;
681 return;
682 }
683 packet_process_incoming(buf, len);
684 }
685}
686
c9f39d2c 687static void
22616013 688client_status_confirm(int type, Channel *c, void *ctx)
c9f39d2c 689{
22616013 690 struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
691 char errmsg[256];
692 int tochan;
693
694 /* XXX supress on mux _client_ quietmode */
695 tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
696 c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
697
698 if (type == SSH2_MSG_CHANNEL_SUCCESS) {
699 debug2("%s request accepted on channel %d",
700 cr->request_type, c->self);
701 } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
702 if (tochan) {
703 snprintf(errmsg, sizeof(errmsg),
704 "%s request failed\r\n", cr->request_type);
705 } else {
706 snprintf(errmsg, sizeof(errmsg),
707 "%s request failed on channel %d",
708 cr->request_type, c->self);
709 }
710 /* If error occurred on primary session channel, then exit */
711 if (cr->do_close && c->self == session_ident)
712 fatal("%s", errmsg);
713 /* If error occurred on mux client, append to their stderr */
714 if (tochan)
715 buffer_append(&c->extended, errmsg, strlen(errmsg));
716 else
717 error("%s", errmsg);
718 if (cr->do_close) {
719 chan_read_failed(c);
720 chan_write_failed(c);
721 }
c9f39d2c 722 }
22616013 723 xfree(cr);
c9f39d2c 724}
725
726static void
22616013 727client_abandon_status_confirm(Channel *c, void *ctx)
c9f39d2c 728{
22616013 729 xfree(ctx);
c9f39d2c 730}
731
732static void
22616013 733client_expect_confirm(int id, const char *request, int do_close)
c9f39d2c 734{
22616013 735 struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
c9f39d2c 736
22616013 737 cr->request_type = request;
738 cr->do_close = do_close;
c9f39d2c 739
22616013 740 channel_register_status_confirm(id, client_status_confirm,
741 client_abandon_status_confirm, cr);
742}
c9f39d2c 743
22616013 744void
745client_register_global_confirm(global_confirm_cb *cb, void *ctx)
746{
747 struct global_confirm *gc, *last_gc;
748
749 /* Coalesce identical callbacks */
750 last_gc = TAILQ_LAST(&global_confirms, global_confirms);
751 if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
752 if (++last_gc->ref_count >= INT_MAX)
753 fatal("%s: last_gc->ref_count = %d",
754 __func__, last_gc->ref_count);
c9f39d2c 755 return;
756 }
c9f39d2c 757
22616013 758 gc = xmalloc(sizeof(*gc));
759 gc->cb = cb;
760 gc->ctx = ctx;
761 gc->ref_count = 1;
762 TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
c9f39d2c 763}
764
700318f3 765static void
766process_cmdline(void)
767{
768 void (*handler)(int);
996d5e62 769 char *s, *cmd, *cancel_host;
c9f39d2c 770 int delete = 0;
91d9cdd3 771 int local = 0, remote = 0, dynamic = 0;
772 int cancel_port;
996d5e62 773 Forward fwd;
700318f3 774
47686178 775 bzero(&fwd, sizeof(fwd));
776 fwd.listen_host = fwd.connect_host = NULL;
777
700318f3 778 leave_raw_mode();
f5799ae1 779 handler = signal(SIGINT, SIG_IGN);
700318f3 780 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
781 if (s == NULL)
782 goto out;
d4487008 783 while (isspace(*s))
700318f3 784 s++;
c9f39d2c 785 if (*s == '-')
786 s++; /* Skip cmdline '-', if any */
787 if (*s == '\0')
788 goto out;
789
790 if (*s == 'h' || *s == 'H' || *s == '?') {
791 logit("Commands:");
9108f8d9 792 logit(" -L[bind_address:]port:host:hostport "
793 "Request local forward");
794 logit(" -R[bind_address:]port:host:hostport "
795 "Request remote forward");
91d9cdd3 796 logit(" -D[bind_address:]port "
797 "Request dynamic forward");
9108f8d9 798 logit(" -KR[bind_address:]port "
799 "Cancel remote forward");
2c06c99b 800 if (!options.permit_local_command)
801 goto out;
9108f8d9 802 logit(" !args "
803 "Execute local command");
2c06c99b 804 goto out;
805 }
806
807 if (*s == '!' && options.permit_local_command) {
808 s++;
809 ssh_local_cmd(s);
700318f3 810 goto out;
c9f39d2c 811 }
812
813 if (*s == 'K') {
814 delete = 1;
815 s++;
816 }
91d9cdd3 817 if (*s == 'L')
818 local = 1;
819 else if (*s == 'R')
820 remote = 1;
821 else if (*s == 'D')
822 dynamic = 1;
823 else {
0fff78ff 824 logit("Invalid command.");
700318f3 825 goto out;
826 }
91d9cdd3 827
828 if ((local || dynamic) && delete) {
c9f39d2c 829 logit("Not supported.");
830 goto out;
831 }
91d9cdd3 832 if (remote && delete && !compat20) {
0fff78ff 833 logit("Not supported for SSH protocol version 1.");
700318f3 834 goto out;
835 }
c9f39d2c 836
d4487008 837 while (isspace(*++s))
838 ;
700318f3 839
c9f39d2c 840 if (delete) {
996d5e62 841 cancel_port = 0;
842 cancel_host = hpdelim(&s); /* may be NULL */
843 if (s != NULL) {
844 cancel_port = a2port(s);
845 cancel_host = cleanhostname(cancel_host);
846 } else {
847 cancel_port = a2port(cancel_host);
848 cancel_host = NULL;
c9f39d2c 849 }
91d9cdd3 850 if (cancel_port <= 0) {
996d5e62 851 logit("Bad forwarding close port");
c9f39d2c 852 goto out;
853 }
996d5e62 854 channel_request_rforward_cancel(cancel_host, cancel_port);
c9f39d2c 855 } else {
91d9cdd3 856 if (!parse_forward(&fwd, s, dynamic, remote)) {
c9f39d2c 857 logit("Bad forwarding specification.");
858 goto out;
859 }
91d9cdd3 860 if (local || dynamic) {
996d5e62 861 if (channel_setup_local_fwd_listener(fwd.listen_host,
862 fwd.listen_port, fwd.connect_host,
863 fwd.connect_port, options.gateway_ports) < 0) {
c9f39d2c 864 logit("Port forwarding failed.");
865 goto out;
866 }
996d5e62 867 } else {
9108f8d9 868 if (channel_request_remote_forwarding(fwd.listen_host,
996d5e62 869 fwd.listen_port, fwd.connect_host,
9108f8d9 870 fwd.connect_port) < 0) {
871 logit("Port forwarding failed.");
872 goto out;
873 }
996d5e62 874 }
875
c9f39d2c 876 logit("Forwarding port.");
877 }
878
700318f3 879out:
880 signal(SIGINT, handler);
881 enter_raw_mode();
882 if (cmd)
883 xfree(cmd);
47686178 884 if (fwd.listen_host != NULL)
885 xfree(fwd.listen_host);
886 if (fwd.connect_host != NULL)
887 xfree(fwd.connect_host);
700318f3 888}
889
22616013 890/*
891 * Process the characters one by one, call with c==NULL for proto1 case.
892 */
3c0ef626 893static int
22616013 894process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
895 char *buf, int len)
3c0ef626 896{
897 char string[1024];
898 pid_t pid;
899 int bytes = 0;
900 u_int i;
901 u_char ch;
902 char *s;
22616013 903 int *escape_pendingp, escape_char;
904 struct escape_filter_ctx *efc;
3c0ef626 905
22616013 906 if (c == NULL) {
907 escape_pendingp = &escape_pending1;
908 escape_char = escape_char1;
909 } else {
910 if (c->filter_ctx == NULL)
911 return 0;
912 efc = (struct escape_filter_ctx *)c->filter_ctx;
913 escape_pendingp = &efc->escape_pending;
914 escape_char = efc->escape_char;
915 }
916
665a873d 917 if (len <= 0)
918 return (0);
919
920 for (i = 0; i < (u_int)len; i++) {
3c0ef626 921 /* Get one character at a time. */
922 ch = buf[i];
923
22616013 924 if (*escape_pendingp) {
3c0ef626 925 /* We have previously seen an escape character. */
926 /* Clear the flag now. */
22616013 927 *escape_pendingp = 0;
3c0ef626 928
929 /* Process the escaped character. */
930 switch (ch) {
931 case '.':
932 /* Terminate the connection. */
22616013 933 snprintf(string, sizeof string, "%c.\r\n",
934 escape_char);
3c0ef626 935 buffer_append(berr, string, strlen(string));
936
22616013 937 if (c && c->ctl_fd != -1) {
938 chan_read_failed(c);
939 chan_write_failed(c);
940 return 0;
941 } else
942 quit_pending = 1;
3c0ef626 943 return -1;
944
945 case 'Z' - 64:
22616013 946 /* XXX support this for mux clients */
947 if (c && c->ctl_fd != -1) {
948 noescape:
949 snprintf(string, sizeof string,
950 "%c%c escape not available to "
951 "multiplexed sessions\r\n",
952 escape_char, ch);
953 buffer_append(berr, string,
954 strlen(string));
955 continue;
956 }
957 /* Suspend the program. Inform the user */
958 snprintf(string, sizeof string,
959 "%c^Z [suspend ssh]\r\n", escape_char);
3c0ef626 960 buffer_append(berr, string, strlen(string));
961
962 /* Restore terminal modes and suspend. */
963 client_suspend_self(bin, bout, berr);
964
965 /* We have been continued. */
966 continue;
967
0fff78ff 968 case 'B':
969 if (compat20) {
970 snprintf(string, sizeof string,
971 "%cB\r\n", escape_char);
972 buffer_append(berr, string,
973 strlen(string));
974 channel_request_start(session_ident,
975 "break", 0);
976 packet_put_int(1000);
977 packet_send();
978 }
979 continue;
980
3c0ef626 981 case 'R':
982 if (compat20) {
983 if (datafellows & SSH_BUG_NOREKEY)
22616013 984 logit("Server does not "
985 "support re-keying");
3c0ef626 986 else
987 need_rekeying = 1;
988 }
989 continue;
990
991 case '&':
22616013 992 if (c && c->ctl_fd != -1)
993 goto noescape;
3c0ef626 994 /*
22616013 995 * Detach the program (continue to serve
996 * connections, but put in background and no
997 * more new connections).
3c0ef626 998 */
999 /* Restore tty modes. */
1000 leave_raw_mode();
1001
1002 /* Stop listening for new connections. */
1003 channel_stop_listening();
1004
1005 snprintf(string, sizeof string,
1006 "%c& [backgrounded]\n", escape_char);
1007 buffer_append(berr, string, strlen(string));
1008
1009 /* Fork into background. */
1010 pid = fork();
1011 if (pid < 0) {
1012 error("fork: %.100s", strerror(errno));
1013 continue;
1014 }
1015 if (pid != 0) { /* This is the parent. */
1016 /* The parent just exits. */
1017 exit(0);
1018 }
1019 /* The child continues serving connections. */
1020 if (compat20) {
1021 buffer_append(bin, "\004", 1);
1022 /* fake EOF on stdin */
1023 return -1;
1024 } else if (!stdin_eof) {
1025 /*
22616013 1026 * Sending SSH_CMSG_EOF alone does not
1027 * always appear to be enough. So we
1028 * try to send an EOF character first.
3c0ef626 1029 */
1030 packet_start(SSH_CMSG_STDIN_DATA);
1031 packet_put_string("\004", 1);
1032 packet_send();
1033 /* Close stdin. */
1034 stdin_eof = 1;
1035 if (buffer_len(bin) == 0) {
1036 packet_start(SSH_CMSG_EOF);
1037 packet_send();
1038 }
1039 }
1040 continue;
1041
1042 case '?':
22616013 1043 if (c && c->ctl_fd != -1) {
1044 snprintf(string, sizeof string,
1045"%c?\r\n\
1046Supported escape sequences:\r\n\
1047 %c. - terminate session\r\n\
1048 %cB - send a BREAK to the remote system\r\n\
22616013 1049 %cR - Request rekey (SSH protocol 2 only)\r\n\
1050 %c# - list forwarded connections\r\n\
1051 %c? - this message\r\n\
1052 %c%c - send the escape character by typing it twice\r\n\
1053(Note that escapes are only recognized immediately after newline.)\r\n",
1054 escape_char, escape_char,
1055 escape_char, escape_char,
1056 escape_char, escape_char,
91d9cdd3 1057 escape_char, escape_char);
22616013 1058 } else {
1059 snprintf(string, sizeof string,
3c0ef626 1060"%c?\r\n\
1061Supported escape sequences:\r\n\
22616013 1062 %c. - terminate connection (and any multiplexed sessions)\r\n\
1063 %cB - send a BREAK to the remote system\r\n\
1064 %cC - open a command line\r\n\
1065 %cR - Request rekey (SSH protocol 2 only)\r\n\
1066 %c^Z - suspend ssh\r\n\
1067 %c# - list forwarded connections\r\n\
1068 %c& - background ssh (when waiting for connections to terminate)\r\n\
1069 %c? - this message\r\n\
1070 %c%c - send the escape character by typing it twice\r\n\
3c0ef626 1071(Note that escapes are only recognized immediately after newline.)\r\n",
22616013 1072 escape_char, escape_char,
1073 escape_char, escape_char,
1074 escape_char, escape_char,
1075 escape_char, escape_char,
1076 escape_char, escape_char,
1077 escape_char);
1078 }
3c0ef626 1079 buffer_append(berr, string, strlen(string));
1080 continue;
1081
1082 case '#':
22616013 1083 snprintf(string, sizeof string, "%c#\r\n",
1084 escape_char);
3c0ef626 1085 buffer_append(berr, string, strlen(string));
1086 s = channel_open_message();
1087 buffer_append(berr, s, strlen(s));
1088 xfree(s);
1089 continue;
1090
700318f3 1091 case 'C':
91d9cdd3 1092 if (c && c->ctl_fd != -1)
1093 goto noescape;
700318f3 1094 process_cmdline();
1095 continue;
1096
3c0ef626 1097 default:
1098 if (ch != escape_char) {
1099 buffer_put_char(bin, escape_char);
1100 bytes++;
1101 }
1102 /* Escaped characters fall through here */
1103 break;
1104 }
1105 } else {
1106 /*
22616013 1107 * The previous character was not an escape char.
1108 * Check if this is an escape.
3c0ef626 1109 */
1110 if (last_was_cr && ch == escape_char) {
22616013 1111 /*
1112 * It is. Set the flag and continue to
1113 * next character.
1114 */
1115 *escape_pendingp = 1;
3c0ef626 1116 continue;
1117 }
1118 }
1119
1120 /*
1121 * Normal character. Record whether it was a newline,
1122 * and append it to the buffer.
1123 */
1124 last_was_cr = (ch == '\r' || ch == '\n');
1125 buffer_put_char(bin, ch);
1126 bytes++;
1127 }
1128 return bytes;
1129}
1130
1131static void
9108f8d9 1132client_process_input(fd_set *readset)
3c0ef626 1133{
1134 int len;
1135 char buf[8192];
1136
1137 /* Read input from stdin. */
1138 if (FD_ISSET(fileno(stdin), readset)) {
1139 /* Read as much as possible. */
1140 len = read(fileno(stdin), buf, sizeof(buf));
22616013 1141 if (len < 0 &&
1142 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
3c0ef626 1143 return; /* we'll try again later */
1144 if (len <= 0) {
1145 /*
1146 * Received EOF or error. They are treated
1147 * similarly, except that an error message is printed
1148 * if it was an error condition.
1149 */
1150 if (len < 0) {
22616013 1151 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1152 strerror(errno));
3c0ef626 1153 buffer_append(&stderr_buffer, buf, strlen(buf));
1154 }
1155 /* Mark that we have seen EOF. */
1156 stdin_eof = 1;
1157 /*
1158 * Send an EOF message to the server unless there is
1159 * data in the buffer. If there is data in the
1160 * buffer, no message will be sent now. Code
1161 * elsewhere will send the EOF when the buffer
1162 * becomes empty if stdin_eof is set.
1163 */
1164 if (buffer_len(&stdin_buffer) == 0) {
1165 packet_start(SSH_CMSG_EOF);
1166 packet_send();
1167 }
22616013 1168 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
3c0ef626 1169 /*
1170 * Normal successful read, and no escape character.
1171 * Just append the data to buffer.
1172 */
1173 buffer_append(&stdin_buffer, buf, len);
1174 } else {
1175 /*
22616013 1176 * Normal, successful read. But we have an escape
1177 * character and have to process the characters one
1178 * by one.
3c0ef626 1179 */
22616013 1180 if (process_escapes(NULL, &stdin_buffer,
1181 &stdout_buffer, &stderr_buffer, buf, len) == -1)
3c0ef626 1182 return;
1183 }
1184 }
1185}
1186
1187static void
9108f8d9 1188client_process_output(fd_set *writeset)
3c0ef626 1189{
1190 int len;
1191 char buf[100];
1192
1193 /* Write buffered output to stdout. */
1194 if (FD_ISSET(fileno(stdout), writeset)) {
1195 /* Write as much data as possible. */
1196 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1197 buffer_len(&stdout_buffer));
1198 if (len <= 0) {
22616013 1199 if (errno == EINTR || errno == EAGAIN ||
1200 errno == EWOULDBLOCK)
3c0ef626 1201 len = 0;
1202 else {
1203 /*
1204 * An error or EOF was encountered. Put an
1205 * error message to stderr buffer.
1206 */
22616013 1207 snprintf(buf, sizeof buf,
1208 "write stdout: %.50s\r\n", strerror(errno));
3c0ef626 1209 buffer_append(&stderr_buffer, buf, strlen(buf));
1210 quit_pending = 1;
1211 return;
1212 }
1213 }
1214 /* Consume printed data from the buffer. */
1215 buffer_consume(&stdout_buffer, len);
3c0ef626 1216 }
1217 /* Write buffered output to stderr. */
1218 if (FD_ISSET(fileno(stderr), writeset)) {
1219 /* Write as much data as possible. */
1220 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1221 buffer_len(&stderr_buffer));
1222 if (len <= 0) {
22616013 1223 if (errno == EINTR || errno == EAGAIN ||
1224 errno == EWOULDBLOCK)
3c0ef626 1225 len = 0;
1226 else {
22616013 1227 /*
1228 * EOF or error, but can't even print
1229 * error message.
1230 */
3c0ef626 1231 quit_pending = 1;
1232 return;
1233 }
1234 }
1235 /* Consume printed characters from the buffer. */
1236 buffer_consume(&stderr_buffer, len);
3c0ef626 1237 }
1238}
1239
1240/*
1241 * Get packets from the connection input buffer, and process them as long as
1242 * there are packets available.
1243 *
1244 * Any unknown packets received during the actual
1245 * session cause the session to terminate. This is
1246 * intended to make debugging easier since no
1247 * confirmations are sent. Any compatible protocol
1248 * extensions must be negotiated during the
1249 * preparatory phase.
1250 */
1251
1252static void
1253client_process_buffered_input_packets(void)
1254{
22616013 1255 dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1256 compat20 ? xxx_kex : NULL);
3c0ef626 1257}
1258
1259/* scan buf[] for '~' before sending data to the peer */
1260
22616013 1261/* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1262void *
1263client_new_escape_filter_ctx(int escape_char)
3c0ef626 1264{
22616013 1265 struct escape_filter_ctx *ret;
1266
1267 ret = xmalloc(sizeof(*ret));
1268 ret->escape_pending = 0;
1269 ret->escape_char = escape_char;
1270 return (void *)ret;
1271}
1272
1273/* Free the escape filter context on channel free */
1274void
1275client_filter_cleanup(int cid, void *ctx)
1276{
1277 xfree(ctx);
1278}
1279
1280int
1281client_simple_escape_filter(Channel *c, char *buf, int len)
1282{
1283 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1284 return 0;
1285
1286 return process_escapes(c, &c->input, &c->output, &c->extended,
1287 buf, len);
3c0ef626 1288}
1289
1290static void
1291client_channel_closed(int id, void *arg)
1292{
3c0ef626 1293 channel_cancel_cleanup(id);
1294 session_closed = 1;
cdd66111 1295 leave_raw_mode();
3c0ef626 1296}
1297
1298/*
1299 * Implements the interactive session with the server. This is called after
1300 * the user has been authenticated, and a command has been started on the
1301 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1302 * used as an escape character for terminating or suspending the session.
1303 */
1304
1305int
1306client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1307{
1308 fd_set *readset = NULL, *writeset = NULL;
1309 double start_time, total_time;
c9f39d2c 1310 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
22616013 1311 u_int64_t ibytes, obytes;
c9f39d2c 1312 u_int nalloc = 0;
3c0ef626 1313 char buf[100];
1314
1315 debug("Entering interactive session.");
1316
1317 start_time = get_current_time();
1318
1319 /* Initialize variables. */
22616013 1320 escape_pending1 = 0;
3c0ef626 1321 last_was_cr = 1;
1322 exit_status = -1;
1323 stdin_eof = 0;
1324 buffer_high = 64 * 1024;
1325 connection_in = packet_get_connection_in();
1326 connection_out = packet_get_connection_out();
1327 max_fd = MAX(connection_in, connection_out);
22616013 1328 if (muxserver_sock != -1)
1329 max_fd = MAX(max_fd, muxserver_sock);
3c0ef626 1330
1331 if (!compat20) {
1332 /* enable nonblocking unless tty */
1333 if (!isatty(fileno(stdin)))
1334 set_nonblock(fileno(stdin));
1335 if (!isatty(fileno(stdout)))
1336 set_nonblock(fileno(stdout));
1337 if (!isatty(fileno(stderr)))
1338 set_nonblock(fileno(stderr));
1339 max_fd = MAX(max_fd, fileno(stdin));
1340 max_fd = MAX(max_fd, fileno(stdout));
1341 max_fd = MAX(max_fd, fileno(stderr));
1342 }
3c0ef626 1343 quit_pending = 0;
22616013 1344 escape_char1 = escape_char_arg;
3c0ef626 1345
1346 /* Initialize buffers. */
1347 buffer_init(&stdin_buffer);
1348 buffer_init(&stdout_buffer);
1349 buffer_init(&stderr_buffer);
1350
1351 client_init_dispatch();
1352
6a9b3198 1353 /*
1354 * Set signal handlers, (e.g. to restore non-blocking mode)
1355 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1356 */
996d5e62 1357 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1358 signal(SIGHUP, signal_handler);
6a9b3198 1359 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1360 signal(SIGINT, signal_handler);
1361 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1362 signal(SIGQUIT, signal_handler);
1363 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1364 signal(SIGTERM, signal_handler);
996d5e62 1365 signal(SIGWINCH, window_change_handler);
3c0ef626 1366
1367 if (have_pty)
1368 enter_raw_mode();
1369
1370 if (compat20) {
1371 session_ident = ssh2_chan_id;
22616013 1372 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
3c0ef626 1373 channel_register_filter(session_ident,
22616013 1374 client_simple_escape_filter, NULL,
1375 client_filter_cleanup,
1376 client_new_escape_filter_ctx(escape_char_arg));
3c0ef626 1377 if (session_ident != -1)
1378 channel_register_cleanup(session_ident,
2c06c99b 1379 client_channel_closed, 0);
3c0ef626 1380 } else {
1381 /* Check if we should immediately send eof on stdin. */
1382 client_check_initial_eof_on_stdin();
1383 }
1384
1385 /* Main loop of the client for the interactive session mode. */
1386 while (!quit_pending) {
1387
1388 /* Process buffered packets sent by the server. */
1389 client_process_buffered_input_packets();
1390
1391 if (compat20 && session_closed && !channel_still_open())
1392 break;
1393
1394 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1395
1396 if (rekeying) {
1397 debug("rekeying in progress");
1398 } else {
1399 /*
1400 * Make packets of buffered stdin data, and buffer
1401 * them for sending to the server.
1402 */
1403 if (!compat20)
1404 client_make_packets_from_stdin_data();
1405
1406 /*
1407 * Make packets from buffered channel data, and
1408 * enqueue them for sending to the server.
1409 */
1410 if (packet_not_very_much_data_to_write())
1411 channel_output_poll();
1412
1413 /*
1414 * Check if the window size has changed, and buffer a
1415 * message about it to the server if so.
1416 */
1417 client_check_window_change();
1418
1419 if (quit_pending)
1420 break;
1421 }
1422 /*
1423 * Wait until we have something to do (something becomes
1424 * available on one of the descriptors).
1425 */
1426 max_fd2 = max_fd;
1427 client_wait_until_can_do_something(&readset, &writeset,
1428 &max_fd2, &nalloc, rekeying);
1429
1430 if (quit_pending)
1431 break;
1432
1433 /* Do channel operations unless rekeying in progress. */
1434 if (!rekeying) {
1435 channel_after_select(readset, writeset);
f97edba6 1436
1437 if (options.gss_renewal_rekey &&
1438 ssh_gssapi_credentials_updated(GSS_C_NO_CONTEXT)) {
1439 debug("credentials updated - forcing rekey");
1440 need_rekeying = 1;
1441 }
1442
0fff78ff 1443 if (need_rekeying || packet_need_rekeying()) {
1444 debug("need rekeying");
3c0ef626 1445 xxx_kex->done = 0;
1446 kex_send_kexinit(xxx_kex);
1447 need_rekeying = 0;
1448 }
1449 }
1450
1451 /* Buffer input from the connection. */
1452 client_process_net_input(readset);
1453
c9f39d2c 1454 /* Accept control connections. */
22616013 1455 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1456 if (muxserver_accept_control())
1457 quit_pending = 1;
1458 }
c9f39d2c 1459
3c0ef626 1460 if (quit_pending)
1461 break;
1462
1463 if (!compat20) {
1464 /* Buffer data from stdin */
1465 client_process_input(readset);
1466 /*
1467 * Process output to stdout and stderr. Output to
1468 * the connection is processed elsewhere (above).
1469 */
1470 client_process_output(writeset);
1471 }
1472
22616013 1473 /*
1474 * Send as much buffered packet data as possible to the
1475 * sender.
1476 */
3c0ef626 1477 if (FD_ISSET(connection_out, writeset))
1478 packet_write_poll();
1479 }
1480 if (readset)
1481 xfree(readset);
1482 if (writeset)
1483 xfree(writeset);
1484
1485 /* Terminate the session. */
1486
1487 /* Stop watching for window change. */
996d5e62 1488 signal(SIGWINCH, SIG_DFL);
3c0ef626 1489
1490 channel_free_all();
1491
1492 if (have_pty)
1493 leave_raw_mode();
1494
1495 /* restore blocking io */
1496 if (!isatty(fileno(stdin)))
1497 unset_nonblock(fileno(stdin));
1498 if (!isatty(fileno(stdout)))
1499 unset_nonblock(fileno(stdout));
1500 if (!isatty(fileno(stderr)))
1501 unset_nonblock(fileno(stderr));
1502
cdd66111 1503 /*
1504 * If there was no shell or command requested, there will be no remote
1505 * exit status to be returned. In that case, clear error code if the
1506 * connection was deliberately terminated at this end.
1507 */
1508 if (no_shell_flag && received_signal == SIGTERM) {
1509 received_signal = 0;
1510 exit_status = 0;
9cb1827b 1511 }
12408a1b 1512
cdd66111 1513 if (received_signal)
1514 fatal("Killed by signal %d.", (int) received_signal);
1515
3c0ef626 1516 /*
1517 * In interactive mode (with pseudo tty) display a message indicating
1518 * that the connection has been closed.
1519 */
1520 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
22616013 1521 snprintf(buf, sizeof buf,
1522 "Connection to %.64s closed.\r\n", host);
3c0ef626 1523 buffer_append(&stderr_buffer, buf, strlen(buf));
1524 }
1525
1526 /* Output any buffered data for stdout. */
1527 while (buffer_len(&stdout_buffer) > 0) {
1528 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1529 buffer_len(&stdout_buffer));
1530 if (len <= 0) {
1531 error("Write failed flushing stdout buffer.");
1532 break;
1533 }
1534 buffer_consume(&stdout_buffer, len);
3c0ef626 1535 }
1536
1537 /* Output any buffered data for stderr. */
1538 while (buffer_len(&stderr_buffer) > 0) {
1539 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1540 buffer_len(&stderr_buffer));
1541 if (len <= 0) {
1542 error("Write failed flushing stderr buffer.");
1543 break;
1544 }
1545 buffer_consume(&stderr_buffer, len);
3c0ef626 1546 }
1547
1548 /* Clear and free any buffers. */
1549 memset(buf, 0, sizeof(buf));
1550 buffer_free(&stdin_buffer);
1551 buffer_free(&stdout_buffer);
1552 buffer_free(&stderr_buffer);
1553
1554 /* Report bytes transferred, and transfer rates. */
1555 total_time = get_current_time() - start_time;
22616013 1556 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1557 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1558 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1559 obytes, ibytes, total_time);
3c0ef626 1560 if (total_time > 0)
22616013 1561 verbose("Bytes per second: sent %.1f, received %.1f",
1562 obytes / total_time, ibytes / total_time);
3c0ef626 1563 /* Return the exit status of the program. */
1564 debug("Exit status %d", exit_status);
1565 return exit_status;
1566}
1567
1568/*********/
1569
1570static void
e9a17296 1571client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
3c0ef626 1572{
1573 u_int data_len;
1574 char *data = packet_get_string(&data_len);
e9a17296 1575 packet_check_eom();
3c0ef626 1576 buffer_append(&stdout_buffer, data, data_len);
1577 memset(data, 0, data_len);
1578 xfree(data);
1579}
1580static void
e9a17296 1581client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
3c0ef626 1582{
1583 u_int data_len;
1584 char *data = packet_get_string(&data_len);
e9a17296 1585 packet_check_eom();
3c0ef626 1586 buffer_append(&stderr_buffer, data, data_len);
1587 memset(data, 0, data_len);
1588 xfree(data);
1589}
1590static void
e9a17296 1591client_input_exit_status(int type, u_int32_t seq, void *ctxt)
3c0ef626 1592{
3c0ef626 1593 exit_status = packet_get_int();
e9a17296 1594 packet_check_eom();
3c0ef626 1595 /* Acknowledge the exit. */
1596 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1597 packet_send();
1598 /*
1599 * Must wait for packet to be sent since we are
1600 * exiting the loop.
1601 */
1602 packet_write_wait();
1603 /* Flag that we want to exit. */
1604 quit_pending = 1;
1605}
cdd66111 1606static void
1607client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1608{
1609 Channel *c = NULL;
1610 int remote_id, sock;
1611
1612 /* Read the remote channel number from the message. */
1613 remote_id = packet_get_int();
1614 packet_check_eom();
1615
1616 /*
1617 * Get a connection to the local authentication agent (this may again
1618 * get forwarded).
1619 */
1620 sock = ssh_get_authentication_socket();
1621
1622 /*
1623 * If we could not connect the agent, send an error message back to
1624 * the server. This should never happen unless the agent dies,
1625 * because authentication forwarding is only enabled if we have an
1626 * agent.
1627 */
1628 if (sock >= 0) {
1629 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1630 -1, 0, 0, 0, "authentication agent connection", 1);
1631 c->remote_id = remote_id;
1632 c->force_drain = 1;
1633 }
1634 if (c == NULL) {
1635 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1636 packet_put_int(remote_id);
1637 } else {
1638 /* Send a confirmation to the remote host. */
1639 debug("Forwarding authentication connection.");
1640 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1641 packet_put_int(remote_id);
1642 packet_put_int(c->self);
1643 }
1644 packet_send();
1645}
3c0ef626 1646
1647static Channel *
1648client_request_forwarded_tcpip(const char *request_type, int rchan)
1649{
41b2f314 1650 Channel *c = NULL;
3c0ef626 1651 char *listen_address, *originator_address;
91d9cdd3 1652 u_short listen_port, originator_port;
3c0ef626 1653
1654 /* Get rest of the packet */
1655 listen_address = packet_get_string(NULL);
1656 listen_port = packet_get_int();
1657 originator_address = packet_get_string(NULL);
1658 originator_port = packet_get_int();
e9a17296 1659 packet_check_eom();
3c0ef626 1660
22616013 1661 debug("client_request_forwarded_tcpip: listen %s port %d, "
1662 "originator %s port %d", listen_address, listen_port,
1663 originator_address, originator_port);
1664
1665 c = channel_connect_by_listen_address(listen_port,
1666 "forwarded-tcpip", originator_address);
3c0ef626 1667
3c0ef626 1668 xfree(originator_address);
1669 xfree(listen_address);
1670 return c;
1671}
1672
41b2f314 1673static Channel *
3c0ef626 1674client_request_x11(const char *request_type, int rchan)
1675{
1676 Channel *c = NULL;
1677 char *originator;
91d9cdd3 1678 u_short originator_port;
3c0ef626 1679 int sock;
1680
1681 if (!options.forward_x11) {
1682 error("Warning: ssh server tried X11 forwarding.");
22616013 1683 error("Warning: this is probably a break-in attempt by a "
1684 "malicious server.");
3c0ef626 1685 return NULL;
1686 }
1687 originator = packet_get_string(NULL);
1688 if (datafellows & SSH_BUG_X11FWD) {
1689 debug2("buggy server: x11 request w/o originator_port");
1690 originator_port = 0;
1691 } else {
1692 originator_port = packet_get_int();
1693 }
e9a17296 1694 packet_check_eom();
3c0ef626 1695 /* XXX check permission */
1696 debug("client_request_x11: request from %s %d", originator,
1697 originator_port);
1698 xfree(originator);
1699 sock = x11_connect_display();
1700 if (sock < 0)
1701 return NULL;
76d45d2f 1702 /* again is this really necessary for X11? */
1703 if (options.hpn_disabled)
3c0ef626 1704 c = channel_new("x11",
1705 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
0fff78ff 1706 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
76d45d2f 1707 else
1708 c = channel_new("x11",
1709 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1710 options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
3c0ef626 1711 c->force_drain = 1;
1712 return c;
1713}
1714
41b2f314 1715static Channel *
3c0ef626 1716client_request_agent(const char *request_type, int rchan)
1717{
1718 Channel *c = NULL;
1719 int sock;
1720
1721 if (!options.forward_agent) {
1722 error("Warning: ssh server tried agent forwarding.");
22616013 1723 error("Warning: this is probably a break-in attempt by a "
1724 "malicious server.");
3c0ef626 1725 return NULL;
1726 }
799ae497 1727 sock = ssh_get_authentication_socket();
3c0ef626 1728 if (sock < 0)
1729 return NULL;
76d45d2f 1730 if (options.hpn_disabled)
3c0ef626 1731 c = channel_new("authentication agent connection",
1732 SSH_CHANNEL_OPEN, sock, sock, -1,
76d45d2f 1733 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1734 "authentication agent connection", 1);
1735 else
1736 c = channel_new("authentication agent connection",
1737 SSH_CHANNEL_OPEN, sock, sock, -1,
1738 options.hpn_buffer_size, options.hpn_buffer_size, 0,
0fff78ff 1739 "authentication agent connection", 1);
3c0ef626 1740 c->force_drain = 1;
1741 return c;
1742}
1743
d4487008 1744int
1745client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1746{
1747 Channel *c;
1748 int fd;
1749
1750 if (tun_mode == SSH_TUNMODE_NO)
1751 return 0;
1752
1753 if (!compat20) {
91d9cdd3 1754 error("Tunnel forwarding is not supported for protocol 1");
d4487008 1755 return -1;
1756 }
1757
1758 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1759
1760 /* Open local tunnel device */
1761 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1762 error("Tunnel device open failed.");
1763 return -1;
1764 }
1765
76d45d2f 1766 if(options.hpn_disabled)
1767 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1768 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1769 0, "tun", 1);
1770 else
d4487008 1771 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
76d45d2f 1772 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1773 0, "tun", 1);
d4487008 1774 c->datagram = 1;
1775
76d45d2f 1776
1777
d4487008 1778#if defined(SSH_TUN_FILTER)
1779 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1780 channel_register_filter(c->self, sys_tun_infilter,
22616013 1781 sys_tun_outfilter, NULL, NULL);
d4487008 1782#endif
1783
1784 packet_start(SSH2_MSG_CHANNEL_OPEN);
1785 packet_put_cstring("tun@openssh.com");
1786 packet_put_int(c->self);
1787 packet_put_int(c->local_window_max);
1788 packet_put_int(c->local_maxpacket);
1789 packet_put_int(tun_mode);
1790 packet_put_int(remote_tun);
1791 packet_send();
1792
1793 return 0;
1794}
1795
3c0ef626 1796/* XXXX move to generic input handler */
1797static void
e9a17296 1798client_input_channel_open(int type, u_int32_t seq, void *ctxt)
3c0ef626 1799{
1800 Channel *c = NULL;
1801 char *ctype;
3c0ef626 1802 int rchan;
680cee3b 1803 u_int rmaxpack, rwindow, len;
3c0ef626 1804
1805 ctype = packet_get_string(&len);
1806 rchan = packet_get_int();
1807 rwindow = packet_get_int();
1808 rmaxpack = packet_get_int();
1809
1810 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1811 ctype, rchan, rwindow, rmaxpack);
1812
1813 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1814 c = client_request_forwarded_tcpip(ctype, rchan);
1815 } else if (strcmp(ctype, "x11") == 0) {
1816 c = client_request_x11(ctype, rchan);
1817 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1818 c = client_request_agent(ctype, rchan);
1819 }
1820/* XXX duplicate : */
1821 if (c != NULL) {
1822 debug("confirm %s", ctype);
1823 c->remote_id = rchan;
1824 c->remote_window = rwindow;
1825 c->remote_maxpacket = rmaxpack;
1826 if (c->type != SSH_CHANNEL_CONNECTING) {
1827 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1828 packet_put_int(c->remote_id);
1829 packet_put_int(c->self);
1830 packet_put_int(c->local_window);
1831 packet_put_int(c->local_maxpacket);
1832 packet_send();
1833 }
1834 } else {
1835 debug("failure %s", ctype);
1836 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1837 packet_put_int(rchan);
1838 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1839 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1840 packet_put_cstring("open failed");
1841 packet_put_cstring("");
1842 }
1843 packet_send();
1844 }
1845 xfree(ctype);
1846}
1847static void
e9a17296 1848client_input_channel_req(int type, u_int32_t seq, void *ctxt)
3c0ef626 1849{
1850 Channel *c = NULL;
c9f39d2c 1851 int exitval, id, reply, success = 0;
3c0ef626 1852 char *rtype;
1853
1854 id = packet_get_int();
1855 rtype = packet_get_string(NULL);
1856 reply = packet_get_char();
1857
1858 debug("client_input_channel_req: channel %d rtype %s reply %d",
1859 id, rtype, reply);
1860
c9f39d2c 1861 if (id == -1) {
1862 error("client_input_channel_req: request for channel -1");
1863 } else if ((c = channel_lookup(id)) == NULL) {
22616013 1864 error("client_input_channel_req: channel %d: "
1865 "unknown channel", id);
1866 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1867 packet_check_eom();
1868 chan_rcvd_eow(c);
3c0ef626 1869 } else if (strcmp(rtype, "exit-status") == 0) {
c9f39d2c 1870 exitval = packet_get_int();
1871 if (id == session_ident) {
1872 success = 1;
1873 exit_status = exitval;
1874 } else if (c->ctl_fd == -1) {
1875 error("client_input_channel_req: unexpected channel %d",
1876 session_ident);
1877 } else {
1878 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1879 success = 1;
1880 }
e9a17296 1881 packet_check_eom();
3c0ef626 1882 }
1883 if (reply) {
1884 packet_start(success ?
1885 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
91d9cdd3 1886 packet_put_int(c->remote_id);
3c0ef626 1887 packet_send();
1888 }
1889 xfree(rtype);
1890}
e9a17296 1891static void
1892client_input_global_request(int type, u_int32_t seq, void *ctxt)
1893{
1894 char *rtype;
1895 int want_reply;
1896 int success = 0;
1897
1898 rtype = packet_get_string(NULL);
1899 want_reply = packet_get_char();
cdd66111 1900 debug("client_input_global_request: rtype %s want_reply %d",
1901 rtype, want_reply);
e9a17296 1902 if (want_reply) {
1903 packet_start(success ?
1904 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1905 packet_send();
1906 packet_write_wait();
1907 }
1908 xfree(rtype);
1909}
3c0ef626 1910
c9f39d2c 1911void
1912client_session2_setup(int id, int want_tty, int want_subsystem,
22616013 1913 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
c9f39d2c 1914{
1915 int len;
996d5e62 1916 Channel *c = NULL;
c9f39d2c 1917
1918 debug2("%s: id %d", __func__, id);
1919
996d5e62 1920 if ((c = channel_lookup(id)) == NULL)
1921 fatal("client_session2_setup: channel %d: unknown channel", id);
1922
c9f39d2c 1923 if (want_tty) {
1924 struct winsize ws;
c9f39d2c 1925
1926 /* Store window size in the packet. */
1927 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1928 memset(&ws, 0, sizeof(ws));
1929
22616013 1930 channel_request_start(id, "pty-req", 1);
1931 client_expect_confirm(id, "PTY allocation", 0);
c9f39d2c 1932 packet_put_cstring(term != NULL ? term : "");
9108f8d9 1933 packet_put_int((u_int)ws.ws_col);
1934 packet_put_int((u_int)ws.ws_row);
1935 packet_put_int((u_int)ws.ws_xpixel);
1936 packet_put_int((u_int)ws.ws_ypixel);
22616013 1937 if (tiop == NULL)
1938 tiop = get_saved_tio();
1939 tty_make_modes(-1, tiop);
c9f39d2c 1940 packet_send();
1941 /* XXX wait for reply */
996d5e62 1942 c->client_tty = 1;
c9f39d2c 1943 }
1944
1945 /* Transfer any environment variables from client to server */
1946 if (options.num_send_env != 0 && env != NULL) {
1947 int i, j, matched;
1948 char *name, *val;
1949
1950 debug("Sending environment.");
1951 for (i = 0; env[i] != NULL; i++) {
1952 /* Split */
1953 name = xstrdup(env[i]);
1954 if ((val = strchr(name, '=')) == NULL) {
2c06c99b 1955 xfree(name);
c9f39d2c 1956 continue;
1957 }
1958 *val++ = '\0';
1959
1960 matched = 0;
1961 for (j = 0; j < options.num_send_env; j++) {
1962 if (match_pattern(name, options.send_env[j])) {
1963 matched = 1;
1964 break;
1965 }
1966 }
1967 if (!matched) {
1968 debug3("Ignored env %s", name);
2c06c99b 1969 xfree(name);
c9f39d2c 1970 continue;
1971 }
1972
1973 debug("Sending env %s = %s", name, val);
1974 channel_request_start(id, "env", 0);
1975 packet_put_cstring(name);
1976 packet_put_cstring(val);
1977 packet_send();
2c06c99b 1978 xfree(name);
c9f39d2c 1979 }
1980 }
1981
1982 len = buffer_len(cmd);
1983 if (len > 0) {
1984 if (len > 900)
1985 len = 900;
1986 if (want_subsystem) {
22616013 1987 debug("Sending subsystem: %.*s",
1988 len, (u_char*)buffer_ptr(cmd));
1989 channel_request_start(id, "subsystem", 1);
1990 client_expect_confirm(id, "subsystem", 1);
c9f39d2c 1991 } else {
22616013 1992 debug("Sending command: %.*s",
1993 len, (u_char*)buffer_ptr(cmd));
1994 channel_request_start(id, "exec", 1);
1995 client_expect_confirm(id, "exec", 1);
c9f39d2c 1996 }
1997 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1998 packet_send();
1999 } else {
22616013 2000 channel_request_start(id, "shell", 1);
2001 client_expect_confirm(id, "shell", 1);
c9f39d2c 2002 packet_send();
2003 }
2004}
2005
3c0ef626 2006static void
2007client_init_dispatch_20(void)
2008{
2009 dispatch_init(&dispatch_protocol_error);
700318f3 2010
3c0ef626 2011 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2012 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2013 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2014 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2015 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2016 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2017 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2018 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2019 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
22616013 2020 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2021 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
e9a17296 2022 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
3c0ef626 2023
2024 /* rekeying */
2025 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
700318f3 2026
2027 /* global request reply messages */
2028 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2029 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
3c0ef626 2030}
22616013 2031
3c0ef626 2032static void
2033client_init_dispatch_13(void)
2034{
2035 dispatch_init(NULL);
2036 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2037 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2038 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2039 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2040 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2041 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2042 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2043 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2044 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2045
2046 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
cdd66111 2047 &client_input_agent_open : &deny_input_open);
3c0ef626 2048 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2049 &x11_input_open : &deny_input_open);
2050}
22616013 2051
3c0ef626 2052static void
2053client_init_dispatch_15(void)
2054{
2055 client_init_dispatch_13();
2056 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2057 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2058}
22616013 2059
3c0ef626 2060static void
2061client_init_dispatch(void)
2062{
2063 if (compat20)
2064 client_init_dispatch_20();
2065 else if (compat13)
2066 client_init_dispatch_13();
2067 else
2068 client_init_dispatch_15();
2069}
cdd66111 2070
2071/* client specific fatal cleanup */
2072void
2073cleanup_exit(int i)
2074{
2075 leave_raw_mode();
2076 leave_non_blocking();
22616013 2077 if (options.control_path != NULL && muxserver_sock != -1)
c9f39d2c 2078 unlink(options.control_path);
cdd66111 2079 _exit(i);
2080}
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