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1 /* $OpenBSD: clientloop.c,v 1.201 2008/07/16 11:51:14 djm Exp $ */
2 /*
3  * Author: Tatu Ylonen <ylo@cs.hut.fi>
4  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5  *                    All rights reserved
6  * The main loop for the interactive session (client side).
7  *
8  * As far as I am concerned, the code I have written for this software
9  * can be used freely for any purpose.  Any derived versions of this
10  * software must be clearly marked as such, and if the derived work is
11  * incompatible with the protocol description in the RFC file, it must be
12  * called by a name other than "ssh" or "Secure Shell".
13  *
14  *
15  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
16  *
17  * Redistribution and use in source and binary forms, with or without
18  * modification, are permitted provided that the following conditions
19  * are met:
20  * 1. Redistributions of source code must retain the above copyright
21  *    notice, this list of conditions and the following disclaimer.
22  * 2. Redistributions in binary form must reproduce the above copyright
23  *    notice, this list of conditions and the following disclaimer in the
24  *    documentation and/or other materials provided with the distribution.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  *
37  *
38  * SSH2 support added by Markus Friedl.
39  * Copyright (c) 1999, 2000, 2001 Markus Friedl.  All rights reserved.
40  *
41  * Redistribution and use in source and binary forms, with or without
42  * modification, are permitted provided that the following conditions
43  * are met:
44  * 1. Redistributions of source code must retain the above copyright
45  *    notice, this list of conditions and the following disclaimer.
46  * 2. Redistributions in binary form must reproduce the above copyright
47  *    notice, this list of conditions and the following disclaimer in the
48  *    documentation and/or other materials provided with the distribution.
49  *
50  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
60  */
61
62 #include "includes.h"
63
64 #include <sys/types.h>
65 #include <sys/ioctl.h>
66 #include <sys/param.h>
67 #ifdef HAVE_SYS_STAT_H
68 # include <sys/stat.h>
69 #endif
70 #ifdef HAVE_SYS_TIME_H
71 # include <sys/time.h>
72 #endif
73 #include <sys/socket.h>
74
75 #include <ctype.h>
76 #include <errno.h>
77 #ifdef HAVE_PATHS_H
78 #include <paths.h>
79 #endif
80 #include <signal.h>
81 #include <stdarg.h>
82 #include <stdio.h>
83 #include <stdlib.h>
84 #include <string.h>
85 #include <termios.h>
86 #include <pwd.h>
87 #include <unistd.h>
88
89 #include "openbsd-compat/sys-queue.h"
90 #include "xmalloc.h"
91 #include "ssh.h"
92 #include "ssh1.h"
93 #include "ssh2.h"
94 #include "packet.h"
95 #include "buffer.h"
96 #include "compat.h"
97 #include "channels.h"
98 #include "dispatch.h"
99 #include "key.h"
100 #include "cipher.h"
101 #include "kex.h"
102 #include "log.h"
103 #include "readconf.h"
104 #include "clientloop.h"
105 #include "sshconnect.h"
106 #include "authfd.h"
107 #include "atomicio.h"
108 #include "sshpty.h"
109 #include "misc.h"
110 #include "monitor_fdpass.h"
111 #include "match.h"
112 #include "msg.h"
113
114 /* import options */
115 extern Options options;
116
117 /* Flag indicating that stdin should be redirected from /dev/null. */
118 extern int stdin_null_flag;
119
120 /* Flag indicating that no shell has been requested */
121 extern int no_shell_flag;
122
123 /* Control socket */
124 extern int muxserver_sock;
125
126 /*
127  * Name of the host we are connecting to.  This is the name given on the
128  * command line, or the HostName specified for the user-supplied name in a
129  * configuration file.
130  */
131 extern char *host;
132
133 /*
134  * Flag to indicate that we have received a window change signal which has
135  * not yet been processed.  This will cause a message indicating the new
136  * window size to be sent to the server a little later.  This is volatile
137  * because this is updated in a signal handler.
138  */
139 static volatile sig_atomic_t received_window_change_signal = 0;
140 static volatile sig_atomic_t received_signal = 0;
141
142 /* Flag indicating whether the user's terminal is in non-blocking mode. */
143 static int in_non_blocking_mode = 0;
144
145 /* Common data for the client loop code. */
146 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
147 static int escape_char1;        /* Escape character. (proto1 only) */
148 static int escape_pending1;     /* Last character was an escape (proto1 only) */
149 static int last_was_cr;         /* Last character was a newline. */
150 static int exit_status;         /* Used to store the command exit status. */
151 static int stdin_eof;           /* EOF has been encountered on stderr. */
152 static Buffer stdin_buffer;     /* Buffer for stdin data. */
153 static Buffer stdout_buffer;    /* Buffer for stdout data. */
154 static Buffer stderr_buffer;    /* Buffer for stderr data. */
155 static u_int buffer_high;/* Soft max buffer size. */
156 static int connection_in;       /* Connection to server (input). */
157 static int connection_out;      /* Connection to server (output). */
158 static int need_rekeying;       /* Set to non-zero if rekeying is requested. */
159 static int session_closed = 0;  /* In SSH2: login session closed. */
160
161 static void client_init_dispatch(void);
162 int     session_ident = -1;
163
164 /* Track escape per proto2 channel */
165 struct escape_filter_ctx {
166         int escape_pending;
167         int escape_char;
168 };
169
170 /* Context for channel confirmation replies */
171 struct channel_reply_ctx {
172         const char *request_type;
173         int id, do_close;
174 };
175
176 /* Global request success/failure callbacks */
177 struct global_confirm {
178         TAILQ_ENTRY(global_confirm) entry;
179         global_confirm_cb *cb;
180         void *ctx;
181         int ref_count;
182 };
183 TAILQ_HEAD(global_confirms, global_confirm);
184 static struct global_confirms global_confirms =
185     TAILQ_HEAD_INITIALIZER(global_confirms);
186
187 /*XXX*/
188 extern Kex *xxx_kex;
189
190 void ssh_process_session2_setup(int, int, int, Buffer *);
191
192 /* Restores stdin to blocking mode. */
193
194 static void
195 leave_non_blocking(void)
196 {
197         if (in_non_blocking_mode) {
198                 unset_nonblock(fileno(stdin));
199                 in_non_blocking_mode = 0;
200         }
201 }
202
203 /* Puts stdin terminal in non-blocking mode. */
204
205 static void
206 enter_non_blocking(void)
207 {
208         in_non_blocking_mode = 1;
209         set_nonblock(fileno(stdin));
210 }
211
212 /*
213  * Signal handler for the window change signal (SIGWINCH).  This just sets a
214  * flag indicating that the window has changed.
215  */
216 /*ARGSUSED */
217 static void
218 window_change_handler(int sig)
219 {
220         received_window_change_signal = 1;
221         signal(SIGWINCH, window_change_handler);
222 }
223
224 /*
225  * Signal handler for signals that cause the program to terminate.  These
226  * signals must be trapped to restore terminal modes.
227  */
228 /*ARGSUSED */
229 static void
230 signal_handler(int sig)
231 {
232         received_signal = sig;
233         quit_pending = 1;
234 }
235
236 /*
237  * Returns current time in seconds from Jan 1, 1970 with the maximum
238  * available resolution.
239  */
240
241 static double
242 get_current_time(void)
243 {
244         struct timeval tv;
245         gettimeofday(&tv, NULL);
246         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
247 }
248
249 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
250 void
251 client_x11_get_proto(const char *display, const char *xauth_path,
252     u_int trusted, char **_proto, char **_data)
253 {
254         char cmd[1024];
255         char line[512];
256         char xdisplay[512];
257         static char proto[512], data[512];
258         FILE *f;
259         int got_data = 0, generated = 0, do_unlink = 0, i;
260         char *xauthdir, *xauthfile;
261         struct stat st;
262
263         xauthdir = xauthfile = NULL;
264         *_proto = proto;
265         *_data = data;
266         proto[0] = data[0] = '\0';
267
268         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
269                 debug("No xauth program.");
270         } else {
271                 if (display == NULL) {
272                         debug("x11_get_proto: DISPLAY not set");
273                         return;
274                 }
275                 /*
276                  * Handle FamilyLocal case where $DISPLAY does
277                  * not match an authorization entry.  For this we
278                  * just try "xauth list unix:displaynum.screennum".
279                  * XXX: "localhost" match to determine FamilyLocal
280                  *      is not perfect.
281                  */
282                 if (strncmp(display, "localhost:", 10) == 0) {
283                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
284                             display + 10);
285                         display = xdisplay;
286                 }
287                 if (trusted == 0) {
288                         xauthdir = xmalloc(MAXPATHLEN);
289                         xauthfile = xmalloc(MAXPATHLEN);
290                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
291                         if (mkdtemp(xauthdir) != NULL) {
292                                 do_unlink = 1;
293                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
294                                     xauthdir);
295                                 snprintf(cmd, sizeof(cmd),
296                                     "%s -f %s generate %s " SSH_X11_PROTO
297                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
298                                     xauth_path, xauthfile, display);
299                                 debug2("x11_get_proto: %s", cmd);
300                                 if (system(cmd) == 0)
301                                         generated = 1;
302                         }
303                 }
304
305                 /*
306                  * When in untrusted mode, we read the cookie only if it was
307                  * successfully generated as an untrusted one in the step
308                  * above.
309                  */
310                 if (trusted || generated) {
311                         snprintf(cmd, sizeof(cmd),
312                             "%s %s%s list %s 2>" _PATH_DEVNULL,
313                             xauth_path,
314                             generated ? "-f " : "" ,
315                             generated ? xauthfile : "",
316                             display);
317                         debug2("x11_get_proto: %s", cmd);
318                         f = popen(cmd, "r");
319                         if (f && fgets(line, sizeof(line), f) &&
320                             sscanf(line, "%*s %511s %511s", proto, data) == 2)
321                                 got_data = 1;
322                         if (f)
323                                 pclose(f);
324                 } else
325                         error("Warning: untrusted X11 forwarding setup failed: "
326                             "xauth key data not generated");
327         }
328
329         if (do_unlink) {
330                 unlink(xauthfile);
331                 rmdir(xauthdir);
332         }
333         if (xauthdir)
334                 xfree(xauthdir);
335         if (xauthfile)
336                 xfree(xauthfile);
337
338         /*
339          * If we didn't get authentication data, just make up some
340          * data.  The forwarding code will check the validity of the
341          * response anyway, and substitute this data.  The X11
342          * server, however, will ignore this fake data and use
343          * whatever authentication mechanisms it was using otherwise
344          * for the local connection.
345          */
346         if (!got_data) {
347                 u_int32_t rnd = 0;
348
349                 logit("Warning: No xauth data; "
350                     "using fake authentication data for X11 forwarding.");
351                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
352                 for (i = 0; i < 16; i++) {
353                         if (i % 4 == 0)
354                                 rnd = arc4random();
355                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
356                             rnd & 0xff);
357                         rnd >>= 8;
358                 }
359         }
360 }
361
362 /*
363  * This is called when the interactive is entered.  This checks if there is
364  * an EOF coming on stdin.  We must check this explicitly, as select() does
365  * not appear to wake up when redirecting from /dev/null.
366  */
367
368 static void
369 client_check_initial_eof_on_stdin(void)
370 {
371         int len;
372         char buf[1];
373
374         /*
375          * If standard input is to be "redirected from /dev/null", we simply
376          * mark that we have seen an EOF and send an EOF message to the
377          * server. Otherwise, we try to read a single character; it appears
378          * that for some files, such /dev/null, select() never wakes up for
379          * read for this descriptor, which means that we never get EOF.  This
380          * way we will get the EOF if stdin comes from /dev/null or similar.
381          */
382         if (stdin_null_flag) {
383                 /* Fake EOF on stdin. */
384                 debug("Sending eof.");
385                 stdin_eof = 1;
386                 packet_start(SSH_CMSG_EOF);
387                 packet_send();
388         } else {
389                 enter_non_blocking();
390
391                 /* Check for immediate EOF on stdin. */
392                 len = read(fileno(stdin), buf, 1);
393                 if (len == 0) {
394                         /*
395                          * EOF.  Record that we have seen it and send
396                          * EOF to server.
397                          */
398                         debug("Sending eof.");
399                         stdin_eof = 1;
400                         packet_start(SSH_CMSG_EOF);
401                         packet_send();
402                 } else if (len > 0) {
403                         /*
404                          * Got data.  We must store the data in the buffer,
405                          * and also process it as an escape character if
406                          * appropriate.
407                          */
408                         if ((u_char) buf[0] == escape_char1)
409                                 escape_pending1 = 1;
410                         else
411                                 buffer_append(&stdin_buffer, buf, 1);
412                 }
413                 leave_non_blocking();
414         }
415 }
416
417
418 /*
419  * Make packets from buffered stdin data, and buffer them for sending to the
420  * connection.
421  */
422
423 static void
424 client_make_packets_from_stdin_data(void)
425 {
426         u_int len;
427
428         /* Send buffered stdin data to the server. */
429         while (buffer_len(&stdin_buffer) > 0 &&
430             packet_not_very_much_data_to_write()) {
431                 len = buffer_len(&stdin_buffer);
432                 /* Keep the packets at reasonable size. */
433                 if (len > packet_get_maxsize())
434                         len = packet_get_maxsize();
435                 packet_start(SSH_CMSG_STDIN_DATA);
436                 packet_put_string(buffer_ptr(&stdin_buffer), len);
437                 packet_send();
438                 buffer_consume(&stdin_buffer, len);
439                 /* If we have a pending EOF, send it now. */
440                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
441                         packet_start(SSH_CMSG_EOF);
442                         packet_send();
443                 }
444         }
445 }
446
447 /*
448  * Checks if the client window has changed, and sends a packet about it to
449  * the server if so.  The actual change is detected elsewhere (by a software
450  * interrupt on Unix); this just checks the flag and sends a message if
451  * appropriate.
452  */
453
454 static void
455 client_check_window_change(void)
456 {
457         struct winsize ws;
458
459         if (! received_window_change_signal)
460                 return;
461         /** XXX race */
462         received_window_change_signal = 0;
463
464         debug2("client_check_window_change: changed");
465
466         if (compat20) {
467                 channel_send_window_changes();
468         } else {
469                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
470                         return;
471                 packet_start(SSH_CMSG_WINDOW_SIZE);
472                 packet_put_int((u_int)ws.ws_row);
473                 packet_put_int((u_int)ws.ws_col);
474                 packet_put_int((u_int)ws.ws_xpixel);
475                 packet_put_int((u_int)ws.ws_ypixel);
476                 packet_send();
477         }
478 }
479
480 static void
481 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
482 {
483         struct global_confirm *gc;
484
485         if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
486                 return;
487         if (gc->cb != NULL)
488                 gc->cb(type, seq, gc->ctx);
489         if (--gc->ref_count <= 0) {
490                 TAILQ_REMOVE(&global_confirms, gc, entry);
491                 bzero(gc, sizeof(*gc));
492                 xfree(gc);
493         }
494
495         keep_alive_timeouts = 0;
496 }
497
498 static void
499 server_alive_check(void)
500 {
501         if (++keep_alive_timeouts > options.server_alive_count_max) {
502                 logit("Timeout, server not responding.");
503                 cleanup_exit(255);
504         }
505         packet_start(SSH2_MSG_GLOBAL_REQUEST);
506         packet_put_cstring("keepalive@openssh.com");
507         packet_put_char(1);     /* boolean: want reply */
508         packet_send();
509         /* Insert an empty placeholder to maintain ordering */
510         client_register_global_confirm(NULL, NULL);
511 }
512
513 /*
514  * Waits until the client can do something (some data becomes available on
515  * one of the file descriptors).
516  */
517 static void
518 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
519     int *maxfdp, u_int *nallocp, int rekeying)
520 {
521         struct timeval tv, *tvp;
522         int ret;
523
524         /* Add any selections by the channel mechanism. */
525         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
526
527         if (!compat20) {
528                 /* Read from the connection, unless our buffers are full. */
529                 if (buffer_len(&stdout_buffer) < buffer_high &&
530                     buffer_len(&stderr_buffer) < buffer_high &&
531                     channel_not_very_much_buffered_data())
532                         FD_SET(connection_in, *readsetp);
533                 /*
534                  * Read from stdin, unless we have seen EOF or have very much
535                  * buffered data to send to the server.
536                  */
537                 if (!stdin_eof && packet_not_very_much_data_to_write())
538                         FD_SET(fileno(stdin), *readsetp);
539
540                 /* Select stdout/stderr if have data in buffer. */
541                 if (buffer_len(&stdout_buffer) > 0)
542                         FD_SET(fileno(stdout), *writesetp);
543                 if (buffer_len(&stderr_buffer) > 0)
544                         FD_SET(fileno(stderr), *writesetp);
545         } else {
546                 /* channel_prepare_select could have closed the last channel */
547                 if (session_closed && !channel_still_open() &&
548                     !packet_have_data_to_write()) {
549                         /* clear mask since we did not call select() */
550                         memset(*readsetp, 0, *nallocp);
551                         memset(*writesetp, 0, *nallocp);
552                         return;
553                 } else {
554                         FD_SET(connection_in, *readsetp);
555                 }
556         }
557
558         /* Select server connection if have data to write to the server. */
559         if (packet_have_data_to_write())
560                 FD_SET(connection_out, *writesetp);
561
562         if (muxserver_sock != -1)
563                 FD_SET(muxserver_sock, *readsetp);
564
565         /*
566          * Wait for something to happen.  This will suspend the process until
567          * some selected descriptor can be read, written, or has some other
568          * event pending.
569          */
570
571         if (options.server_alive_interval == 0 || !compat20)
572                 tvp = NULL;
573         else {
574                 tv.tv_sec = options.server_alive_interval;
575                 tv.tv_usec = 0;
576                 tvp = &tv;
577         }
578         ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
579         if (ret < 0) {
580                 char buf[100];
581
582                 /*
583                  * We have to clear the select masks, because we return.
584                  * We have to return, because the mainloop checks for the flags
585                  * set by the signal handlers.
586                  */
587                 memset(*readsetp, 0, *nallocp);
588                 memset(*writesetp, 0, *nallocp);
589
590                 if (errno == EINTR)
591                         return;
592                 /* Note: we might still have data in the buffers. */
593                 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
594                 buffer_append(&stderr_buffer, buf, strlen(buf));
595                 quit_pending = 1;
596         } else if (ret == 0)
597                 server_alive_check();
598 }
599
600 static void
601 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
602 {
603         /* Flush stdout and stderr buffers. */
604         if (buffer_len(bout) > 0)
605                 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
606                     buffer_len(bout));
607         if (buffer_len(berr) > 0)
608                 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
609                     buffer_len(berr));
610
611         leave_raw_mode();
612
613         /*
614          * Free (and clear) the buffer to reduce the amount of data that gets
615          * written to swap.
616          */
617         buffer_free(bin);
618         buffer_free(bout);
619         buffer_free(berr);
620
621         /* Send the suspend signal to the program itself. */
622         kill(getpid(), SIGTSTP);
623
624         /* Reset window sizes in case they have changed */
625         received_window_change_signal = 1;
626
627         /* OK, we have been continued by the user. Reinitialize buffers. */
628         buffer_init(bin);
629         buffer_init(bout);
630         buffer_init(berr);
631
632         enter_raw_mode();
633 }
634
635 static void
636 client_process_net_input(fd_set *readset)
637 {
638         int len;
639         char buf[8192];
640
641         /*
642          * Read input from the server, and add any such data to the buffer of
643          * the packet subsystem.
644          */
645         if (FD_ISSET(connection_in, readset)) {
646                 /* Read as much as possible. */
647                 len = read(connection_in, buf, sizeof(buf));
648                 if (len == 0) {
649                         /*
650                          * Received EOF.  The remote host has closed the
651                          * connection.
652                          */
653                         snprintf(buf, sizeof buf,
654                             "Connection to %.300s closed by remote host.\r\n",
655                             host);
656                         buffer_append(&stderr_buffer, buf, strlen(buf));
657                         quit_pending = 1;
658                         return;
659                 }
660                 /*
661                  * There is a kernel bug on Solaris that causes select to
662                  * sometimes wake up even though there is no data available.
663                  */
664                 if (len < 0 &&
665                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
666                         len = 0;
667
668                 if (len < 0) {
669                         /*
670                          * An error has encountered.  Perhaps there is a
671                          * network problem.
672                          */
673                         snprintf(buf, sizeof buf,
674                             "Read from remote host %.300s: %.100s\r\n",
675                             host, strerror(errno));
676                         buffer_append(&stderr_buffer, buf, strlen(buf));
677                         quit_pending = 1;
678                         return;
679                 }
680                 packet_process_incoming(buf, len);
681         }
682 }
683
684 static void
685 client_status_confirm(int type, Channel *c, void *ctx)
686 {
687         struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
688         char errmsg[256];
689         int tochan;
690
691         /* XXX supress on mux _client_ quietmode */
692         tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
693             c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
694
695         if (type == SSH2_MSG_CHANNEL_SUCCESS) {
696                 debug2("%s request accepted on channel %d",
697                     cr->request_type, c->self);
698         } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
699                 if (tochan) {
700                         snprintf(errmsg, sizeof(errmsg),
701                             "%s request failed\r\n", cr->request_type);
702                 } else {
703                         snprintf(errmsg, sizeof(errmsg),
704                             "%s request failed on channel %d",
705                             cr->request_type, c->self);
706                 }
707                 /* If error occurred on primary session channel, then exit */
708                 if (cr->do_close && c->self == session_ident)
709                         fatal("%s", errmsg);
710                 /* If error occurred on mux client, append to their stderr */
711                 if (tochan)
712                         buffer_append(&c->extended, errmsg, strlen(errmsg));
713                 else
714                         error("%s", errmsg);
715                 if (cr->do_close) {
716                         chan_read_failed(c);
717                         chan_write_failed(c);
718                 }
719         }
720         xfree(cr);
721 }
722
723 static void
724 client_abandon_status_confirm(Channel *c, void *ctx)
725 {
726         xfree(ctx);
727 }
728
729 static void
730 client_expect_confirm(int id, const char *request, int do_close)
731 {
732         struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
733
734         cr->request_type = request;
735         cr->do_close = do_close;
736
737         channel_register_status_confirm(id, client_status_confirm,
738             client_abandon_status_confirm, cr);
739 }
740
741 void
742 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
743 {
744         struct global_confirm *gc, *last_gc;
745
746         /* Coalesce identical callbacks */
747         last_gc = TAILQ_LAST(&global_confirms, global_confirms);
748         if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
749                 if (++last_gc->ref_count >= INT_MAX)
750                         fatal("%s: last_gc->ref_count = %d",
751                             __func__, last_gc->ref_count);
752                 return;
753         }
754
755         gc = xmalloc(sizeof(*gc));
756         gc->cb = cb;
757         gc->ctx = ctx;
758         gc->ref_count = 1;
759         TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
760 }
761
762 static void
763 process_cmdline(void)
764 {
765         void (*handler)(int);
766         char *s, *cmd, *cancel_host;
767         int delete = 0;
768         int local = 0;
769         u_short cancel_port;
770         Forward fwd;
771
772         bzero(&fwd, sizeof(fwd));
773         fwd.listen_host = fwd.connect_host = NULL;
774
775         leave_raw_mode();
776         handler = signal(SIGINT, SIG_IGN);
777         cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
778         if (s == NULL)
779                 goto out;
780         while (isspace(*s))
781                 s++;
782         if (*s == '-')
783                 s++;    /* Skip cmdline '-', if any */
784         if (*s == '\0')
785                 goto out;
786
787         if (*s == 'h' || *s == 'H' || *s == '?') {
788                 logit("Commands:");
789                 logit("      -L[bind_address:]port:host:hostport    "
790                     "Request local forward");
791                 logit("      -R[bind_address:]port:host:hostport    "
792                     "Request remote forward");
793                 logit("      -KR[bind_address:]port                 "
794                     "Cancel remote forward");
795                 if (!options.permit_local_command)
796                         goto out;
797                 logit("      !args                                  "
798                     "Execute local command");
799                 goto out;
800         }
801
802         if (*s == '!' && options.permit_local_command) {
803                 s++;
804                 ssh_local_cmd(s);
805                 goto out;
806         }
807
808         if (*s == 'K') {
809                 delete = 1;
810                 s++;
811         }
812         if (*s != 'L' && *s != 'R') {
813                 logit("Invalid command.");
814                 goto out;
815         }
816         if (*s == 'L')
817                 local = 1;
818         if (local && delete) {
819                 logit("Not supported.");
820                 goto out;
821         }
822         if ((!local || delete) && !compat20) {
823                 logit("Not supported for SSH protocol version 1.");
824                 goto out;
825         }
826
827         while (isspace(*++s))
828                 ;
829
830         if (delete) {
831                 cancel_port = 0;
832                 cancel_host = hpdelim(&s);      /* may be NULL */
833                 if (s != NULL) {
834                         cancel_port = a2port(s);
835                         cancel_host = cleanhostname(cancel_host);
836                 } else {
837                         cancel_port = a2port(cancel_host);
838                         cancel_host = NULL;
839                 }
840                 if (cancel_port == 0) {
841                         logit("Bad forwarding close port");
842                         goto out;
843                 }
844                 channel_request_rforward_cancel(cancel_host, cancel_port);
845         } else {
846                 if (!parse_forward(&fwd, s)) {
847                         logit("Bad forwarding specification.");
848                         goto out;
849                 }
850                 if (local) {
851                         if (channel_setup_local_fwd_listener(fwd.listen_host,
852                             fwd.listen_port, fwd.connect_host,
853                             fwd.connect_port, options.gateway_ports, 
854                             options.hpn_disabled, options.hpn_buffer_size) < 0) {
855                                 logit("Port forwarding failed.");
856                                 goto out;
857                         }
858                 } else {
859                         if (channel_request_remote_forwarding(fwd.listen_host,
860                             fwd.listen_port, fwd.connect_host,
861                             fwd.connect_port) < 0) {
862                                 logit("Port forwarding failed.");
863                                 goto out;
864                         }
865                 }
866
867                 logit("Forwarding port.");
868         }
869
870 out:
871         signal(SIGINT, handler);
872         enter_raw_mode();
873         if (cmd)
874                 xfree(cmd);
875         if (fwd.listen_host != NULL)
876                 xfree(fwd.listen_host);
877         if (fwd.connect_host != NULL)
878                 xfree(fwd.connect_host);
879 }
880
881 /* 
882  * Process the characters one by one, call with c==NULL for proto1 case.
883  */
884 static int
885 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
886     char *buf, int len)
887 {
888         char string[1024];
889         pid_t pid;
890         int bytes = 0;
891         u_int i;
892         u_char ch;
893         char *s;
894         int *escape_pendingp, escape_char;
895         struct escape_filter_ctx *efc;
896
897         if (c == NULL) {
898                 escape_pendingp = &escape_pending1;
899                 escape_char = escape_char1;
900         } else {
901                 if (c->filter_ctx == NULL)
902                         return 0;
903                 efc = (struct escape_filter_ctx *)c->filter_ctx;
904                 escape_pendingp = &efc->escape_pending;
905                 escape_char = efc->escape_char;
906         }
907         
908         if (len <= 0)
909                 return (0);
910
911         for (i = 0; i < (u_int)len; i++) {
912                 /* Get one character at a time. */
913                 ch = buf[i];
914
915                 if (*escape_pendingp) {
916                         /* We have previously seen an escape character. */
917                         /* Clear the flag now. */
918                         *escape_pendingp = 0;
919
920                         /* Process the escaped character. */
921                         switch (ch) {
922                         case '.':
923                                 /* Terminate the connection. */
924                                 snprintf(string, sizeof string, "%c.\r\n",
925                                     escape_char);
926                                 buffer_append(berr, string, strlen(string));
927
928                                 if (c && c->ctl_fd != -1) {
929                                         chan_read_failed(c);
930                                         chan_write_failed(c);
931                                         return 0;
932                                 } else
933                                         quit_pending = 1;
934                                 return -1;
935
936                         case 'Z' - 64:
937                                 /* XXX support this for mux clients */
938                                 if (c && c->ctl_fd != -1) {
939  noescape:
940                                         snprintf(string, sizeof string,
941                                             "%c%c escape not available to "
942                                             "multiplexed sessions\r\n",
943                                             escape_char, ch);
944                                         buffer_append(berr, string,
945                                             strlen(string));
946                                         continue;
947                                 }
948                                 /* Suspend the program. Inform the user */
949                                 snprintf(string, sizeof string,
950                                     "%c^Z [suspend ssh]\r\n", escape_char);
951                                 buffer_append(berr, string, strlen(string));
952
953                                 /* Restore terminal modes and suspend. */
954                                 client_suspend_self(bin, bout, berr);
955
956                                 /* We have been continued. */
957                                 continue;
958
959                         case 'B':
960                                 if (compat20) {
961                                         snprintf(string, sizeof string,
962                                             "%cB\r\n", escape_char);
963                                         buffer_append(berr, string,
964                                             strlen(string));
965                                         channel_request_start(session_ident,
966                                             "break", 0);
967                                         packet_put_int(1000);
968                                         packet_send();
969                                 }
970                                 continue;
971
972                         case 'R':
973                                 if (compat20) {
974                                         if (datafellows & SSH_BUG_NOREKEY)
975                                                 logit("Server does not "
976                                                     "support re-keying");
977                                         else
978                                                 need_rekeying = 1;
979                                 }
980                                 continue;
981
982                         case '&':
983                                 if (c && c->ctl_fd != -1)
984                                         goto noescape;
985                                 /*
986                                  * Detach the program (continue to serve
987                                  * connections, but put in background and no
988                                  * more new connections).
989                                  */
990                                 /* Restore tty modes. */
991                                 leave_raw_mode();
992
993                                 /* Stop listening for new connections. */
994                                 channel_stop_listening();
995
996                                 snprintf(string, sizeof string,
997                                     "%c& [backgrounded]\n", escape_char);
998                                 buffer_append(berr, string, strlen(string));
999
1000                                 /* Fork into background. */
1001                                 pid = fork();
1002                                 if (pid < 0) {
1003                                         error("fork: %.100s", strerror(errno));
1004                                         continue;
1005                                 }
1006                                 if (pid != 0) { /* This is the parent. */
1007                                         /* The parent just exits. */
1008                                         exit(0);
1009                                 }
1010                                 /* The child continues serving connections. */
1011                                 if (compat20) {
1012                                         buffer_append(bin, "\004", 1);
1013                                         /* fake EOF on stdin */
1014                                         return -1;
1015                                 } else if (!stdin_eof) {
1016                                         /*
1017                                          * Sending SSH_CMSG_EOF alone does not
1018                                          * always appear to be enough.  So we
1019                                          * try to send an EOF character first.
1020                                          */
1021                                         packet_start(SSH_CMSG_STDIN_DATA);
1022                                         packet_put_string("\004", 1);
1023                                         packet_send();
1024                                         /* Close stdin. */
1025                                         stdin_eof = 1;
1026                                         if (buffer_len(bin) == 0) {
1027                                                 packet_start(SSH_CMSG_EOF);
1028                                                 packet_send();
1029                                         }
1030                                 }
1031                                 continue;
1032
1033                         case '?':
1034                                 if (c && c->ctl_fd != -1) {
1035                                         snprintf(string, sizeof string,
1036 "%c?\r\n\
1037 Supported escape sequences:\r\n\
1038   %c.  - terminate session\r\n\
1039   %cB  - send a BREAK to the remote system\r\n\
1040   %cC  - open a command line\r\n\
1041   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1042   %c#  - list forwarded connections\r\n\
1043   %c?  - this message\r\n\
1044   %c%c  - send the escape character by typing it twice\r\n\
1045 (Note that escapes are only recognized immediately after newline.)\r\n",
1046                                             escape_char, escape_char,
1047                                             escape_char, escape_char,
1048                                             escape_char, escape_char,
1049                                             escape_char, escape_char,
1050                                             escape_char);
1051                                 } else {
1052                                         snprintf(string, sizeof string,
1053 "%c?\r\n\
1054 Supported escape sequences:\r\n\
1055   %c.  - terminate connection (and any multiplexed sessions)\r\n\
1056   %cB  - send a BREAK to the remote system\r\n\
1057   %cC  - open a command line\r\n\
1058   %cR  - Request rekey (SSH protocol 2 only)\r\n\
1059   %c^Z - suspend ssh\r\n\
1060   %c#  - list forwarded connections\r\n\
1061   %c&  - background ssh (when waiting for connections to terminate)\r\n\
1062   %c?  - this message\r\n\
1063   %c%c  - send the escape character by typing it twice\r\n\
1064 (Note that escapes are only recognized immediately after newline.)\r\n",
1065                                             escape_char, escape_char,
1066                                             escape_char, escape_char,
1067                                             escape_char, escape_char,
1068                                             escape_char, escape_char,
1069                                             escape_char, escape_char,
1070                                             escape_char);
1071                                 }
1072                                 buffer_append(berr, string, strlen(string));
1073                                 continue;
1074
1075                         case '#':
1076                                 snprintf(string, sizeof string, "%c#\r\n",
1077                                     escape_char);
1078                                 buffer_append(berr, string, strlen(string));
1079                                 s = channel_open_message();
1080                                 buffer_append(berr, s, strlen(s));
1081                                 xfree(s);
1082                                 continue;
1083
1084                         case 'C':
1085                                 process_cmdline();
1086                                 continue;
1087
1088                         default:
1089                                 if (ch != escape_char) {
1090                                         buffer_put_char(bin, escape_char);
1091                                         bytes++;
1092                                 }
1093                                 /* Escaped characters fall through here */
1094                                 break;
1095                         }
1096                 } else {
1097                         /*
1098                          * The previous character was not an escape char.
1099                          * Check if this is an escape.
1100                          */
1101                         if (last_was_cr && ch == escape_char) {
1102                                 /*
1103                                  * It is. Set the flag and continue to
1104                                  * next character.
1105                                  */
1106                                 *escape_pendingp = 1;
1107                                 continue;
1108                         }
1109                 }
1110
1111                 /*
1112                  * Normal character.  Record whether it was a newline,
1113                  * and append it to the buffer.
1114                  */
1115                 last_was_cr = (ch == '\r' || ch == '\n');
1116                 buffer_put_char(bin, ch);
1117                 bytes++;
1118         }
1119         return bytes;
1120 }
1121
1122 static void
1123 client_process_input(fd_set *readset)
1124 {
1125         int len;
1126         char buf[8192];
1127
1128         /* Read input from stdin. */
1129         if (FD_ISSET(fileno(stdin), readset)) {
1130                 /* Read as much as possible. */
1131                 len = read(fileno(stdin), buf, sizeof(buf));
1132                 if (len < 0 &&
1133                     (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1134                         return;         /* we'll try again later */
1135                 if (len <= 0) {
1136                         /*
1137                          * Received EOF or error.  They are treated
1138                          * similarly, except that an error message is printed
1139                          * if it was an error condition.
1140                          */
1141                         if (len < 0) {
1142                                 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1143                                     strerror(errno));
1144                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1145                         }
1146                         /* Mark that we have seen EOF. */
1147                         stdin_eof = 1;
1148                         /*
1149                          * Send an EOF message to the server unless there is
1150                          * data in the buffer.  If there is data in the
1151                          * buffer, no message will be sent now.  Code
1152                          * elsewhere will send the EOF when the buffer
1153                          * becomes empty if stdin_eof is set.
1154                          */
1155                         if (buffer_len(&stdin_buffer) == 0) {
1156                                 packet_start(SSH_CMSG_EOF);
1157                                 packet_send();
1158                         }
1159                 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1160                         /*
1161                          * Normal successful read, and no escape character.
1162                          * Just append the data to buffer.
1163                          */
1164                         buffer_append(&stdin_buffer, buf, len);
1165                 } else {
1166                         /*
1167                          * Normal, successful read.  But we have an escape
1168                          * character and have to process the characters one
1169                          * by one.
1170                          */
1171                         if (process_escapes(NULL, &stdin_buffer,
1172                             &stdout_buffer, &stderr_buffer, buf, len) == -1)
1173                                 return;
1174                 }
1175         }
1176 }
1177
1178 static void
1179 client_process_output(fd_set *writeset)
1180 {
1181         int len;
1182         char buf[100];
1183
1184         /* Write buffered output to stdout. */
1185         if (FD_ISSET(fileno(stdout), writeset)) {
1186                 /* Write as much data as possible. */
1187                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1188                     buffer_len(&stdout_buffer));
1189                 if (len <= 0) {
1190                         if (errno == EINTR || errno == EAGAIN ||
1191                             errno == EWOULDBLOCK)
1192                                 len = 0;
1193                         else {
1194                                 /*
1195                                  * An error or EOF was encountered.  Put an
1196                                  * error message to stderr buffer.
1197                                  */
1198                                 snprintf(buf, sizeof buf,
1199                                     "write stdout: %.50s\r\n", strerror(errno));
1200                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1201                                 quit_pending = 1;
1202                                 return;
1203                         }
1204                 }
1205                 /* Consume printed data from the buffer. */
1206                 buffer_consume(&stdout_buffer, len);
1207         }
1208         /* Write buffered output to stderr. */
1209         if (FD_ISSET(fileno(stderr), writeset)) {
1210                 /* Write as much data as possible. */
1211                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1212                     buffer_len(&stderr_buffer));
1213                 if (len <= 0) {
1214                         if (errno == EINTR || errno == EAGAIN ||
1215                             errno == EWOULDBLOCK)
1216                                 len = 0;
1217                         else {
1218                                 /*
1219                                  * EOF or error, but can't even print
1220                                  * error message.
1221                                  */
1222                                 quit_pending = 1;
1223                                 return;
1224                         }
1225                 }
1226                 /* Consume printed characters from the buffer. */
1227                 buffer_consume(&stderr_buffer, len);
1228         }
1229 }
1230
1231 /*
1232  * Get packets from the connection input buffer, and process them as long as
1233  * there are packets available.
1234  *
1235  * Any unknown packets received during the actual
1236  * session cause the session to terminate.  This is
1237  * intended to make debugging easier since no
1238  * confirmations are sent.  Any compatible protocol
1239  * extensions must be negotiated during the
1240  * preparatory phase.
1241  */
1242
1243 static void
1244 client_process_buffered_input_packets(void)
1245 {
1246         dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1247             compat20 ? xxx_kex : NULL);
1248 }
1249
1250 /* scan buf[] for '~' before sending data to the peer */
1251
1252 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1253 void *
1254 client_new_escape_filter_ctx(int escape_char)
1255 {
1256         struct escape_filter_ctx *ret;
1257
1258         ret = xmalloc(sizeof(*ret));
1259         ret->escape_pending = 0;
1260         ret->escape_char = escape_char;
1261         return (void *)ret;
1262 }
1263
1264 /* Free the escape filter context on channel free */
1265 void
1266 client_filter_cleanup(int cid, void *ctx)
1267 {
1268         xfree(ctx);
1269 }
1270
1271 int
1272 client_simple_escape_filter(Channel *c, char *buf, int len)
1273 {
1274         if (c->extended_usage != CHAN_EXTENDED_WRITE)
1275                 return 0;
1276
1277         return process_escapes(c, &c->input, &c->output, &c->extended,
1278             buf, len);
1279 }
1280
1281 static void
1282 client_channel_closed(int id, void *arg)
1283 {
1284         channel_cancel_cleanup(id);
1285         session_closed = 1;
1286         leave_raw_mode();
1287 }
1288
1289 /*
1290  * Implements the interactive session with the server.  This is called after
1291  * the user has been authenticated, and a command has been started on the
1292  * remote host.  If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1293  * used as an escape character for terminating or suspending the session.
1294  */
1295
1296 int
1297 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1298 {
1299         fd_set *readset = NULL, *writeset = NULL;
1300         double start_time, total_time;
1301         int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1302         u_int64_t ibytes, obytes;
1303         u_int nalloc = 0;
1304         char buf[100];
1305
1306         debug("Entering interactive session.");
1307
1308         start_time = get_current_time();
1309
1310         /* Initialize variables. */
1311         escape_pending1 = 0;
1312         last_was_cr = 1;
1313         exit_status = -1;
1314         stdin_eof = 0;
1315         buffer_high = 64 * 1024;
1316         connection_in = packet_get_connection_in();
1317         connection_out = packet_get_connection_out();
1318         max_fd = MAX(connection_in, connection_out);
1319         if (muxserver_sock != -1)
1320                 max_fd = MAX(max_fd, muxserver_sock);
1321
1322         if (!compat20) {
1323                 /* enable nonblocking unless tty */
1324                 if (!isatty(fileno(stdin)))
1325                         set_nonblock(fileno(stdin));
1326                 if (!isatty(fileno(stdout)))
1327                         set_nonblock(fileno(stdout));
1328                 if (!isatty(fileno(stderr)))
1329                         set_nonblock(fileno(stderr));
1330                 max_fd = MAX(max_fd, fileno(stdin));
1331                 max_fd = MAX(max_fd, fileno(stdout));
1332                 max_fd = MAX(max_fd, fileno(stderr));
1333         }
1334         quit_pending = 0;
1335         escape_char1 = escape_char_arg;
1336
1337         /* Initialize buffers. */
1338         buffer_init(&stdin_buffer);
1339         buffer_init(&stdout_buffer);
1340         buffer_init(&stderr_buffer);
1341
1342         client_init_dispatch();
1343
1344         /*
1345          * Set signal handlers, (e.g. to restore non-blocking mode)
1346          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1347          */
1348         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1349                 signal(SIGHUP, signal_handler);
1350         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1351                 signal(SIGINT, signal_handler);
1352         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1353                 signal(SIGQUIT, signal_handler);
1354         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1355                 signal(SIGTERM, signal_handler);
1356         signal(SIGWINCH, window_change_handler);
1357
1358         if (have_pty)
1359                 enter_raw_mode();
1360
1361         if (compat20) {
1362                 session_ident = ssh2_chan_id;
1363                 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1364                         channel_register_filter(session_ident,
1365                             client_simple_escape_filter, NULL,
1366                             client_filter_cleanup,
1367                             client_new_escape_filter_ctx(escape_char_arg));
1368                 if (session_ident != -1)
1369                         channel_register_cleanup(session_ident,
1370                             client_channel_closed, 0);
1371         } else {
1372                 /* Check if we should immediately send eof on stdin. */
1373                 client_check_initial_eof_on_stdin();
1374         }
1375
1376         /* Main loop of the client for the interactive session mode. */
1377         while (!quit_pending) {
1378
1379                 /* Process buffered packets sent by the server. */
1380                 client_process_buffered_input_packets();
1381
1382                 if (compat20 && session_closed && !channel_still_open())
1383                         break;
1384
1385                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1386
1387                 if (rekeying) {
1388                         debug("rekeying in progress");
1389                 } else {
1390                         /*
1391                          * Make packets of buffered stdin data, and buffer
1392                          * them for sending to the server.
1393                          */
1394                         if (!compat20)
1395                                 client_make_packets_from_stdin_data();
1396
1397                         /*
1398                          * Make packets from buffered channel data, and
1399                          * enqueue them for sending to the server.
1400                          */
1401                         if (packet_not_very_much_data_to_write())
1402                                 channel_output_poll();
1403
1404                         /*
1405                          * Check if the window size has changed, and buffer a
1406                          * message about it to the server if so.
1407                          */
1408                         client_check_window_change();
1409
1410                         if (quit_pending)
1411                                 break;
1412                 }
1413                 /*
1414                  * Wait until we have something to do (something becomes
1415                  * available on one of the descriptors).
1416                  */
1417                 max_fd2 = max_fd;
1418                 client_wait_until_can_do_something(&readset, &writeset,
1419                     &max_fd2, &nalloc, rekeying);
1420
1421                 if (quit_pending)
1422                         break;
1423
1424                 /* Do channel operations unless rekeying in progress. */
1425                 if (!rekeying) {
1426                         channel_after_select(readset, writeset);
1427                         if (need_rekeying || packet_need_rekeying()) {
1428                                 debug("need rekeying");
1429                                 xxx_kex->done = 0;
1430                                 kex_send_kexinit(xxx_kex);
1431                                 need_rekeying = 0;
1432                         }
1433                 }
1434
1435                 /* Buffer input from the connection.  */
1436                 client_process_net_input(readset);
1437
1438                 /* Accept control connections.  */
1439                 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1440                         if (muxserver_accept_control())
1441                                 quit_pending = 1;
1442                 }
1443
1444                 if (quit_pending)
1445                         break;
1446
1447                 if (!compat20) {
1448                         /* Buffer data from stdin */
1449                         client_process_input(readset);
1450                         /*
1451                          * Process output to stdout and stderr.  Output to
1452                          * the connection is processed elsewhere (above).
1453                          */
1454                         client_process_output(writeset);
1455                 }
1456
1457                 /*
1458                  * Send as much buffered packet data as possible to the
1459                  * sender.
1460                  */
1461                 if (FD_ISSET(connection_out, writeset))
1462                         packet_write_poll();
1463         }
1464         if (readset)
1465                 xfree(readset);
1466         if (writeset)
1467                 xfree(writeset);
1468
1469         /* Terminate the session. */
1470
1471         /* Stop watching for window change. */
1472         signal(SIGWINCH, SIG_DFL);
1473
1474         channel_free_all();
1475
1476         if (have_pty)
1477                 leave_raw_mode();
1478
1479         /* restore blocking io */
1480         if (!isatty(fileno(stdin)))
1481                 unset_nonblock(fileno(stdin));
1482         if (!isatty(fileno(stdout)))
1483                 unset_nonblock(fileno(stdout));
1484         if (!isatty(fileno(stderr)))
1485                 unset_nonblock(fileno(stderr));
1486
1487         /*
1488          * If there was no shell or command requested, there will be no remote
1489          * exit status to be returned.  In that case, clear error code if the
1490          * connection was deliberately terminated at this end.
1491          */
1492         if (no_shell_flag && received_signal == SIGTERM) {
1493                 received_signal = 0;
1494                 exit_status = 0;
1495         }
1496
1497         if (received_signal)
1498                 fatal("Killed by signal %d.", (int) received_signal);
1499
1500         /*
1501          * In interactive mode (with pseudo tty) display a message indicating
1502          * that the connection has been closed.
1503          */
1504         if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1505                 snprintf(buf, sizeof buf,
1506                     "Connection to %.64s closed.\r\n", host);
1507                 buffer_append(&stderr_buffer, buf, strlen(buf));
1508         }
1509
1510         /* Output any buffered data for stdout. */
1511         while (buffer_len(&stdout_buffer) > 0) {
1512                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1513                     buffer_len(&stdout_buffer));
1514                 if (len <= 0) {
1515                         error("Write failed flushing stdout buffer.");
1516                         break;
1517                 }
1518                 buffer_consume(&stdout_buffer, len);
1519         }
1520
1521         /* Output any buffered data for stderr. */
1522         while (buffer_len(&stderr_buffer) > 0) {
1523                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1524                     buffer_len(&stderr_buffer));
1525                 if (len <= 0) {
1526                         error("Write failed flushing stderr buffer.");
1527                         break;
1528                 }
1529                 buffer_consume(&stderr_buffer, len);
1530         }
1531
1532         /* Clear and free any buffers. */
1533         memset(buf, 0, sizeof(buf));
1534         buffer_free(&stdin_buffer);
1535         buffer_free(&stdout_buffer);
1536         buffer_free(&stderr_buffer);
1537
1538         /* Report bytes transferred, and transfer rates. */
1539         total_time = get_current_time() - start_time;
1540         packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1541         packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1542         verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1543             obytes, ibytes, total_time);
1544         if (total_time > 0)
1545                 verbose("Bytes per second: sent %.1f, received %.1f",
1546                     obytes / total_time, ibytes / total_time);
1547         /* Return the exit status of the program. */
1548         debug("Exit status %d", exit_status);
1549         return exit_status;
1550 }
1551
1552 /*********/
1553
1554 static void
1555 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1556 {
1557         u_int data_len;
1558         char *data = packet_get_string(&data_len);
1559         packet_check_eom();
1560         buffer_append(&stdout_buffer, data, data_len);
1561         memset(data, 0, data_len);
1562         xfree(data);
1563 }
1564 static void
1565 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1566 {
1567         u_int data_len;
1568         char *data = packet_get_string(&data_len);
1569         packet_check_eom();
1570         buffer_append(&stderr_buffer, data, data_len);
1571         memset(data, 0, data_len);
1572         xfree(data);
1573 }
1574 static void
1575 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1576 {
1577         exit_status = packet_get_int();
1578         packet_check_eom();
1579         /* Acknowledge the exit. */
1580         packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1581         packet_send();
1582         /*
1583          * Must wait for packet to be sent since we are
1584          * exiting the loop.
1585          */
1586         packet_write_wait();
1587         /* Flag that we want to exit. */
1588         quit_pending = 1;
1589 }
1590 static void
1591 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1592 {
1593         Channel *c = NULL;
1594         int remote_id, sock;
1595
1596         /* Read the remote channel number from the message. */
1597         remote_id = packet_get_int();
1598         packet_check_eom();
1599
1600         /*
1601          * Get a connection to the local authentication agent (this may again
1602          * get forwarded).
1603          */
1604         sock = ssh_get_authentication_socket();
1605
1606         /*
1607          * If we could not connect the agent, send an error message back to
1608          * the server. This should never happen unless the agent dies,
1609          * because authentication forwarding is only enabled if we have an
1610          * agent.
1611          */
1612         if (sock >= 0) {
1613                 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1614                     -1, 0, 0, 0, "authentication agent connection", 1);
1615                 c->remote_id = remote_id;
1616                 c->force_drain = 1;
1617         }
1618         if (c == NULL) {
1619                 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1620                 packet_put_int(remote_id);
1621         } else {
1622                 /* Send a confirmation to the remote host. */
1623                 debug("Forwarding authentication connection.");
1624                 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1625                 packet_put_int(remote_id);
1626                 packet_put_int(c->self);
1627         }
1628         packet_send();
1629 }
1630
1631 static Channel *
1632 client_request_forwarded_tcpip(const char *request_type, int rchan)
1633 {
1634         Channel *c = NULL;
1635         char *listen_address, *originator_address;
1636         int listen_port, originator_port;
1637
1638         /* Get rest of the packet */
1639         listen_address = packet_get_string(NULL);
1640         listen_port = packet_get_int();
1641         originator_address = packet_get_string(NULL);
1642         originator_port = packet_get_int();
1643         packet_check_eom();
1644
1645         debug("client_request_forwarded_tcpip: listen %s port %d, "
1646             "originator %s port %d", listen_address, listen_port,
1647             originator_address, originator_port);
1648
1649         c = channel_connect_by_listen_address(listen_port,
1650             "forwarded-tcpip", originator_address);
1651
1652         xfree(originator_address);
1653         xfree(listen_address);
1654         return c;
1655 }
1656
1657 static Channel *
1658 client_request_x11(const char *request_type, int rchan)
1659 {
1660         Channel *c = NULL;
1661         char *originator;
1662         int originator_port;
1663         int sock;
1664
1665         if (!options.forward_x11) {
1666                 error("Warning: ssh server tried X11 forwarding.");
1667                 error("Warning: this is probably a break-in attempt by a "
1668                     "malicious server.");
1669                 return NULL;
1670         }
1671         originator = packet_get_string(NULL);
1672         if (datafellows & SSH_BUG_X11FWD) {
1673                 debug2("buggy server: x11 request w/o originator_port");
1674                 originator_port = 0;
1675         } else {
1676                 originator_port = packet_get_int();
1677         }
1678         packet_check_eom();
1679         /* XXX check permission */
1680         debug("client_request_x11: request from %s %d", originator,
1681             originator_port);
1682         xfree(originator);
1683         sock = x11_connect_display();
1684         if (sock < 0)
1685                 return NULL;
1686         /* again is this really necessary for X11? */
1687         if (options.hpn_disabled) 
1688         c = channel_new("x11",
1689             SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1690             CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1691         else 
1692                 c = channel_new("x11",
1693                     SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1694                     options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1695         c->force_drain = 1;
1696         return c;
1697 }
1698
1699 static Channel *
1700 client_request_agent(const char *request_type, int rchan)
1701 {
1702         Channel *c = NULL;
1703         int sock;
1704
1705         if (!options.forward_agent) {
1706                 error("Warning: ssh server tried agent forwarding.");
1707                 error("Warning: this is probably a break-in attempt by a "
1708                     "malicious server.");
1709                 return NULL;
1710         }
1711         sock = ssh_get_authentication_socket();
1712         if (sock < 0)
1713                 return NULL;
1714         /* not sure this is really needed here either */
1715         if (options.hpn_disabled) 
1716         c = channel_new("authentication agent connection",
1717             SSH_CHANNEL_OPEN, sock, sock, -1,
1718             CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1719             "authentication agent connection", 1);
1720         else
1721                 c = channel_new("authentication agent connection",
1722                     SSH_CHANNEL_OPEN, sock, sock, -1,
1723                     options.hpn_buffer_size, options.hpn_buffer_size, 0,
1724                     "authentication agent connection", 1);
1725         c->force_drain = 1;
1726         return c;
1727 }
1728
1729 int
1730 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1731 {
1732         Channel *c;
1733         int fd;
1734
1735         if (tun_mode == SSH_TUNMODE_NO)
1736                 return 0;
1737
1738         if (!compat20) {
1739                 error("Tunnel forwarding is not support for protocol 1");
1740                 return -1;
1741         }
1742
1743         debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1744
1745         /* Open local tunnel device */
1746         if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1747                 error("Tunnel device open failed.");
1748                 return -1;
1749         }
1750
1751         if(options.hpn_disabled)
1752         c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1753                                 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1754                                 0, "tun", 1);
1755         else
1756         c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1757                                 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1758                                 0, "tun", 1);
1759         c->datagram = 1;
1760
1761 #if defined(SSH_TUN_FILTER)
1762         if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1763                 channel_register_filter(c->self, sys_tun_infilter,
1764                     sys_tun_outfilter, NULL, NULL);
1765 #endif
1766
1767         packet_start(SSH2_MSG_CHANNEL_OPEN);
1768         packet_put_cstring("tun@openssh.com");
1769         packet_put_int(c->self);
1770         packet_put_int(c->local_window_max);
1771         packet_put_int(c->local_maxpacket);
1772         packet_put_int(tun_mode);
1773         packet_put_int(remote_tun);
1774         packet_send();
1775
1776         return 0;
1777 }
1778
1779 /* XXXX move to generic input handler */
1780 static void
1781 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1782 {
1783         Channel *c = NULL;
1784         char *ctype;
1785         int rchan;
1786         u_int rmaxpack, rwindow, len;
1787
1788         ctype = packet_get_string(&len);
1789         rchan = packet_get_int();
1790         rwindow = packet_get_int();
1791         rmaxpack = packet_get_int();
1792
1793         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1794             ctype, rchan, rwindow, rmaxpack);
1795
1796         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1797                 c = client_request_forwarded_tcpip(ctype, rchan);
1798         } else if (strcmp(ctype, "x11") == 0) {
1799                 c = client_request_x11(ctype, rchan);
1800         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1801                 c = client_request_agent(ctype, rchan);
1802         }
1803 /* XXX duplicate : */
1804         if (c != NULL) {
1805                 debug("confirm %s", ctype);
1806                 c->remote_id = rchan;
1807                 c->remote_window = rwindow;
1808                 c->remote_maxpacket = rmaxpack;
1809                 if (c->type != SSH_CHANNEL_CONNECTING) {
1810                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1811                         packet_put_int(c->remote_id);
1812                         packet_put_int(c->self);
1813                         packet_put_int(c->local_window);
1814                         packet_put_int(c->local_maxpacket);
1815                         packet_send();
1816                 }
1817         } else {
1818                 debug("failure %s", ctype);
1819                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1820                 packet_put_int(rchan);
1821                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1822                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1823                         packet_put_cstring("open failed");
1824                         packet_put_cstring("");
1825                 }
1826                 packet_send();
1827         }
1828         xfree(ctype);
1829 }
1830 static void
1831 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1832 {
1833         Channel *c = NULL;
1834         int exitval, id, reply, success = 0;
1835         char *rtype;
1836
1837         id = packet_get_int();
1838         rtype = packet_get_string(NULL);
1839         reply = packet_get_char();
1840
1841         debug("client_input_channel_req: channel %d rtype %s reply %d",
1842             id, rtype, reply);
1843
1844         if (id == -1) {
1845                 error("client_input_channel_req: request for channel -1");
1846         } else if ((c = channel_lookup(id)) == NULL) {
1847                 error("client_input_channel_req: channel %d: "
1848                     "unknown channel", id);
1849         } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1850                 packet_check_eom();
1851                 chan_rcvd_eow(c);
1852         } else if (strcmp(rtype, "exit-status") == 0) {
1853                 exitval = packet_get_int();
1854                 if (id == session_ident) {
1855                         success = 1;
1856                         exit_status = exitval;
1857                 } else if (c->ctl_fd == -1) {
1858                         error("client_input_channel_req: unexpected channel %d",
1859                             session_ident);
1860                 } else {
1861                         atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1862                         success = 1;
1863                 }
1864                 packet_check_eom();
1865         }
1866         if (reply) {
1867                 packet_start(success ?
1868                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1869                 packet_put_int(id);
1870                 packet_send();
1871         }
1872         xfree(rtype);
1873 }
1874 static void
1875 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1876 {
1877         char *rtype;
1878         int want_reply;
1879         int success = 0;
1880
1881         rtype = packet_get_string(NULL);
1882         want_reply = packet_get_char();
1883         debug("client_input_global_request: rtype %s want_reply %d",
1884             rtype, want_reply);
1885         if (want_reply) {
1886                 packet_start(success ?
1887                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1888                 packet_send();
1889                 packet_write_wait();
1890         }
1891         xfree(rtype);
1892 }
1893
1894 void
1895 client_session2_setup(int id, int want_tty, int want_subsystem,
1896     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1897 {
1898         int len;
1899         Channel *c = NULL;
1900
1901         debug2("%s: id %d", __func__, id);
1902
1903         if ((c = channel_lookup(id)) == NULL)
1904                 fatal("client_session2_setup: channel %d: unknown channel", id);
1905
1906         if (want_tty) {
1907                 struct winsize ws;
1908
1909                 /* Store window size in the packet. */
1910                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1911                         memset(&ws, 0, sizeof(ws));
1912
1913                 channel_request_start(id, "pty-req", 1);
1914                 client_expect_confirm(id, "PTY allocation", 0);
1915                 packet_put_cstring(term != NULL ? term : "");
1916                 packet_put_int((u_int)ws.ws_col);
1917                 packet_put_int((u_int)ws.ws_row);
1918                 packet_put_int((u_int)ws.ws_xpixel);
1919                 packet_put_int((u_int)ws.ws_ypixel);
1920                 if (tiop == NULL)
1921                         tiop = get_saved_tio();
1922                 tty_make_modes(-1, tiop);
1923                 packet_send();
1924                 /* XXX wait for reply */
1925                 c->client_tty = 1;
1926         }
1927
1928         /* Transfer any environment variables from client to server */
1929         if (options.num_send_env != 0 && env != NULL) {
1930                 int i, j, matched;
1931                 char *name, *val;
1932
1933                 debug("Sending environment.");
1934                 for (i = 0; env[i] != NULL; i++) {
1935                         /* Split */
1936                         name = xstrdup(env[i]);
1937                         if ((val = strchr(name, '=')) == NULL) {
1938                                 xfree(name);
1939                                 continue;
1940                         }
1941                         *val++ = '\0';
1942
1943                         matched = 0;
1944                         for (j = 0; j < options.num_send_env; j++) {
1945                                 if (match_pattern(name, options.send_env[j])) {
1946                                         matched = 1;
1947                                         break;
1948                                 }
1949                         }
1950                         if (!matched) {
1951                                 debug3("Ignored env %s", name);
1952                                 xfree(name);
1953                                 continue;
1954                         }
1955
1956                         debug("Sending env %s = %s", name, val);
1957                         channel_request_start(id, "env", 0);
1958                         packet_put_cstring(name);
1959                         packet_put_cstring(val);
1960                         packet_send();
1961                         xfree(name);
1962                 }
1963         }
1964
1965         len = buffer_len(cmd);
1966         if (len > 0) {
1967                 if (len > 900)
1968                         len = 900;
1969                 if (want_subsystem) {
1970                         debug("Sending subsystem: %.*s",
1971                             len, (u_char*)buffer_ptr(cmd));
1972                         channel_request_start(id, "subsystem", 1);
1973                         client_expect_confirm(id, "subsystem", 1);
1974                 } else {
1975                         debug("Sending command: %.*s",
1976                             len, (u_char*)buffer_ptr(cmd));
1977                         channel_request_start(id, "exec", 1);
1978                         client_expect_confirm(id, "exec", 1);
1979                 }
1980                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1981                 packet_send();
1982         } else {
1983                 channel_request_start(id, "shell", 1);
1984                 client_expect_confirm(id, "shell", 1);
1985                 packet_send();
1986         }
1987 }
1988
1989 static void
1990 client_init_dispatch_20(void)
1991 {
1992         dispatch_init(&dispatch_protocol_error);
1993
1994         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1995         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1996         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1997         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1998         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1999         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2000         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2001         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2002         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2003         dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2004         dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2005         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2006
2007         /* rekeying */
2008         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2009
2010         /* global request reply messages */
2011         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2012         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2013 }
2014
2015 static void
2016 client_init_dispatch_13(void)
2017 {
2018         dispatch_init(NULL);
2019         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2020         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2021         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2022         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2023         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2024         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2025         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2026         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2027         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2028
2029         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2030             &client_input_agent_open : &deny_input_open);
2031         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2032             &x11_input_open : &deny_input_open);
2033 }
2034
2035 static void
2036 client_init_dispatch_15(void)
2037 {
2038         client_init_dispatch_13();
2039         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2040         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2041 }
2042
2043 static void
2044 client_init_dispatch(void)
2045 {
2046         if (compat20)
2047                 client_init_dispatch_20();
2048         else if (compat13)
2049                 client_init_dispatch_13();
2050         else
2051                 client_init_dispatch_15();
2052 }
2053
2054 /* client specific fatal cleanup */
2055 void
2056 cleanup_exit(int i)
2057 {
2058         leave_raw_mode();
2059         leave_non_blocking();
2060         if (options.control_path != NULL && muxserver_sock != -1)
2061                 unlink(options.control_path);
2062         _exit(i);
2063 }
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