]> andersk Git - openssh.git/blob - clientloop.c
ca7b9060ade19e5abdaa7c9adf45cd333034e5ae
[openssh.git] / clientloop.c
1 /* $OpenBSD: clientloop.c,v 1.172 2006/07/26 02:35:17 stevesk 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 <string.h>
82 #include <termios.h>
83 #include <unistd.h>
84
85 #include "ssh.h"
86 #include "ssh1.h"
87 #include "ssh2.h"
88 #include "xmalloc.h"
89 #include "packet.h"
90 #include "buffer.h"
91 #include "compat.h"
92 #include "channels.h"
93 #include "dispatch.h"
94 #include "buffer.h"
95 #include "bufaux.h"
96 #include "key.h"
97 #include "kex.h"
98 #include "log.h"
99 #include "readconf.h"
100 #include "clientloop.h"
101 #include "sshconnect.h"
102 #include "authfd.h"
103 #include "atomicio.h"
104 #include "sshpty.h"
105 #include "misc.h"
106 #include "monitor_fdpass.h"
107 #include "match.h"
108 #include "msg.h"
109
110 /* import options */
111 extern Options options;
112
113 /* Flag indicating that stdin should be redirected from /dev/null. */
114 extern int stdin_null_flag;
115
116 /* Flag indicating that no shell has been requested */
117 extern int no_shell_flag;
118
119 /* Control socket */
120 extern int control_fd;
121
122 /*
123  * Name of the host we are connecting to.  This is the name given on the
124  * command line, or the HostName specified for the user-supplied name in a
125  * configuration file.
126  */
127 extern char *host;
128
129 /*
130  * Flag to indicate that we have received a window change signal which has
131  * not yet been processed.  This will cause a message indicating the new
132  * window size to be sent to the server a little later.  This is volatile
133  * because this is updated in a signal handler.
134  */
135 static volatile sig_atomic_t received_window_change_signal = 0;
136 static volatile sig_atomic_t received_signal = 0;
137
138 /* Flag indicating whether the user's terminal is in non-blocking mode. */
139 static int in_non_blocking_mode = 0;
140
141 /* Common data for the client loop code. */
142 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
143 static int escape_char;         /* Escape character. */
144 static int escape_pending;      /* Last character was the escape character */
145 static int last_was_cr;         /* Last character was a newline. */
146 static int exit_status;         /* Used to store the exit status of the command. */
147 static int stdin_eof;           /* EOF has been encountered on standard error. */
148 static Buffer stdin_buffer;     /* Buffer for stdin data. */
149 static Buffer stdout_buffer;    /* Buffer for stdout data. */
150 static Buffer stderr_buffer;    /* Buffer for stderr data. */
151 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
152 static u_int buffer_high;/* Soft max buffer size. */
153 static int connection_in;       /* Connection to server (input). */
154 static int connection_out;      /* Connection to server (output). */
155 static int need_rekeying;       /* Set to non-zero if rekeying is requested. */
156 static int session_closed = 0;  /* In SSH2: login session closed. */
157 static int server_alive_timeouts = 0;
158
159 static void client_init_dispatch(void);
160 int     session_ident = -1;
161
162 struct confirm_ctx {
163         int want_tty;
164         int want_subsys;
165         int want_x_fwd;
166         int want_agent_fwd;
167         Buffer cmd;
168         char *term;
169         struct termios tio;
170         char **env;
171 };
172
173 /*XXX*/
174 extern Kex *xxx_kex;
175
176 void ssh_process_session2_setup(int, int, int, Buffer *);
177
178 /* Restores stdin to blocking mode. */
179
180 static void
181 leave_non_blocking(void)
182 {
183         if (in_non_blocking_mode) {
184                 unset_nonblock(fileno(stdin));
185                 in_non_blocking_mode = 0;
186         }
187 }
188
189 /* Puts stdin terminal in non-blocking mode. */
190
191 static void
192 enter_non_blocking(void)
193 {
194         in_non_blocking_mode = 1;
195         set_nonblock(fileno(stdin));
196 }
197
198 /*
199  * Signal handler for the window change signal (SIGWINCH).  This just sets a
200  * flag indicating that the window has changed.
201  */
202 /*ARGSUSED */
203 static void
204 window_change_handler(int sig)
205 {
206         received_window_change_signal = 1;
207         signal(SIGWINCH, window_change_handler);
208 }
209
210 /*
211  * Signal handler for signals that cause the program to terminate.  These
212  * signals must be trapped to restore terminal modes.
213  */
214 /*ARGSUSED */
215 static void
216 signal_handler(int sig)
217 {
218         received_signal = sig;
219         quit_pending = 1;
220 }
221
222 /*
223  * Returns current time in seconds from Jan 1, 1970 with the maximum
224  * available resolution.
225  */
226
227 static double
228 get_current_time(void)
229 {
230         struct timeval tv;
231         gettimeofday(&tv, NULL);
232         return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
233 }
234
235 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
236 void
237 client_x11_get_proto(const char *display, const char *xauth_path,
238     u_int trusted, char **_proto, char **_data)
239 {
240         char cmd[1024];
241         char line[512];
242         char xdisplay[512];
243         static char proto[512], data[512];
244         FILE *f;
245         int got_data = 0, generated = 0, do_unlink = 0, i;
246         char *xauthdir, *xauthfile;
247         struct stat st;
248
249         xauthdir = xauthfile = NULL;
250         *_proto = proto;
251         *_data = data;
252         proto[0] = data[0] = '\0';
253
254         if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
255                 debug("No xauth program.");
256         } else {
257                 if (display == NULL) {
258                         debug("x11_get_proto: DISPLAY not set");
259                         return;
260                 }
261                 /*
262                  * Handle FamilyLocal case where $DISPLAY does
263                  * not match an authorization entry.  For this we
264                  * just try "xauth list unix:displaynum.screennum".
265                  * XXX: "localhost" match to determine FamilyLocal
266                  *      is not perfect.
267                  */
268                 if (strncmp(display, "localhost:", 10) == 0) {
269                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
270                             display + 10);
271                         display = xdisplay;
272                 }
273                 if (trusted == 0) {
274                         xauthdir = xmalloc(MAXPATHLEN);
275                         xauthfile = xmalloc(MAXPATHLEN);
276                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
277                         if (mkdtemp(xauthdir) != NULL) {
278                                 do_unlink = 1;
279                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
280                                     xauthdir);
281                                 snprintf(cmd, sizeof(cmd),
282                                     "%s -f %s generate %s " SSH_X11_PROTO
283                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
284                                     xauth_path, xauthfile, display);
285                                 debug2("x11_get_proto: %s", cmd);
286                                 if (system(cmd) == 0)
287                                         generated = 1;
288                         }
289                 }
290                 snprintf(cmd, sizeof(cmd),
291                     "%s %s%s list %s 2>" _PATH_DEVNULL,
292                     xauth_path,
293                     generated ? "-f " : "" ,
294                     generated ? xauthfile : "",
295                     display);
296                 debug2("x11_get_proto: %s", cmd);
297                 f = popen(cmd, "r");
298                 if (f && fgets(line, sizeof(line), f) &&
299                     sscanf(line, "%*s %511s %511s", proto, data) == 2)
300                         got_data = 1;
301                 if (f)
302                         pclose(f);
303         }
304
305         if (do_unlink) {
306                 unlink(xauthfile);
307                 rmdir(xauthdir);
308         }
309         if (xauthdir)
310                 xfree(xauthdir);
311         if (xauthfile)
312                 xfree(xauthfile);
313
314         /*
315          * If we didn't get authentication data, just make up some
316          * data.  The forwarding code will check the validity of the
317          * response anyway, and substitute this data.  The X11
318          * server, however, will ignore this fake data and use
319          * whatever authentication mechanisms it was using otherwise
320          * for the local connection.
321          */
322         if (!got_data) {
323                 u_int32_t rnd = 0;
324
325                 logit("Warning: No xauth data; "
326                     "using fake authentication data for X11 forwarding.");
327                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
328                 for (i = 0; i < 16; i++) {
329                         if (i % 4 == 0)
330                                 rnd = arc4random();
331                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
332                             rnd & 0xff);
333                         rnd >>= 8;
334                 }
335         }
336 }
337
338 /*
339  * This is called when the interactive is entered.  This checks if there is
340  * an EOF coming on stdin.  We must check this explicitly, as select() does
341  * not appear to wake up when redirecting from /dev/null.
342  */
343
344 static void
345 client_check_initial_eof_on_stdin(void)
346 {
347         int len;
348         char buf[1];
349
350         /*
351          * If standard input is to be "redirected from /dev/null", we simply
352          * mark that we have seen an EOF and send an EOF message to the
353          * server. Otherwise, we try to read a single character; it appears
354          * that for some files, such /dev/null, select() never wakes up for
355          * read for this descriptor, which means that we never get EOF.  This
356          * way we will get the EOF if stdin comes from /dev/null or similar.
357          */
358         if (stdin_null_flag) {
359                 /* Fake EOF on stdin. */
360                 debug("Sending eof.");
361                 stdin_eof = 1;
362                 packet_start(SSH_CMSG_EOF);
363                 packet_send();
364         } else {
365                 enter_non_blocking();
366
367                 /* Check for immediate EOF on stdin. */
368                 len = read(fileno(stdin), buf, 1);
369                 if (len == 0) {
370                         /* EOF.  Record that we have seen it and send EOF to server. */
371                         debug("Sending eof.");
372                         stdin_eof = 1;
373                         packet_start(SSH_CMSG_EOF);
374                         packet_send();
375                 } else if (len > 0) {
376                         /*
377                          * Got data.  We must store the data in the buffer,
378                          * and also process it as an escape character if
379                          * appropriate.
380                          */
381                         if ((u_char) buf[0] == escape_char)
382                                 escape_pending = 1;
383                         else
384                                 buffer_append(&stdin_buffer, buf, 1);
385                 }
386                 leave_non_blocking();
387         }
388 }
389
390
391 /*
392  * Make packets from buffered stdin data, and buffer them for sending to the
393  * connection.
394  */
395
396 static void
397 client_make_packets_from_stdin_data(void)
398 {
399         u_int len;
400
401         /* Send buffered stdin data to the server. */
402         while (buffer_len(&stdin_buffer) > 0 &&
403             packet_not_very_much_data_to_write()) {
404                 len = buffer_len(&stdin_buffer);
405                 /* Keep the packets at reasonable size. */
406                 if (len > packet_get_maxsize())
407                         len = packet_get_maxsize();
408                 packet_start(SSH_CMSG_STDIN_DATA);
409                 packet_put_string(buffer_ptr(&stdin_buffer), len);
410                 packet_send();
411                 buffer_consume(&stdin_buffer, len);
412                 stdin_bytes += len;
413                 /* If we have a pending EOF, send it now. */
414                 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
415                         packet_start(SSH_CMSG_EOF);
416                         packet_send();
417                 }
418         }
419 }
420
421 /*
422  * Checks if the client window has changed, and sends a packet about it to
423  * the server if so.  The actual change is detected elsewhere (by a software
424  * interrupt on Unix); this just checks the flag and sends a message if
425  * appropriate.
426  */
427
428 static void
429 client_check_window_change(void)
430 {
431         struct winsize ws;
432
433         if (! received_window_change_signal)
434                 return;
435         /** XXX race */
436         received_window_change_signal = 0;
437
438         debug2("client_check_window_change: changed");
439
440         if (compat20) {
441                 channel_send_window_changes();
442         } else {
443                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
444                         return;
445                 packet_start(SSH_CMSG_WINDOW_SIZE);
446                 packet_put_int((u_int)ws.ws_row);
447                 packet_put_int((u_int)ws.ws_col);
448                 packet_put_int((u_int)ws.ws_xpixel);
449                 packet_put_int((u_int)ws.ws_ypixel);
450                 packet_send();
451         }
452 }
453
454 static void
455 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
456 {
457         server_alive_timeouts = 0;
458         client_global_request_reply_fwd(type, seq, ctxt);
459 }
460
461 static void
462 server_alive_check(void)
463 {
464         if (++server_alive_timeouts > options.server_alive_count_max)
465                 packet_disconnect("Timeout, server not responding.");
466         packet_start(SSH2_MSG_GLOBAL_REQUEST);
467         packet_put_cstring("keepalive@openssh.com");
468         packet_put_char(1);     /* boolean: want reply */
469         packet_send();
470 }
471
472 /*
473  * Waits until the client can do something (some data becomes available on
474  * one of the file descriptors).
475  */
476 static void
477 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
478     int *maxfdp, u_int *nallocp, int rekeying)
479 {
480         struct timeval tv, *tvp;
481         int ret;
482
483         /* Add any selections by the channel mechanism. */
484         channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
485
486         if (!compat20) {
487                 /* Read from the connection, unless our buffers are full. */
488                 if (buffer_len(&stdout_buffer) < buffer_high &&
489                     buffer_len(&stderr_buffer) < buffer_high &&
490                     channel_not_very_much_buffered_data())
491                         FD_SET(connection_in, *readsetp);
492                 /*
493                  * Read from stdin, unless we have seen EOF or have very much
494                  * buffered data to send to the server.
495                  */
496                 if (!stdin_eof && packet_not_very_much_data_to_write())
497                         FD_SET(fileno(stdin), *readsetp);
498
499                 /* Select stdout/stderr if have data in buffer. */
500                 if (buffer_len(&stdout_buffer) > 0)
501                         FD_SET(fileno(stdout), *writesetp);
502                 if (buffer_len(&stderr_buffer) > 0)
503                         FD_SET(fileno(stderr), *writesetp);
504         } else {
505                 /* channel_prepare_select could have closed the last channel */
506                 if (session_closed && !channel_still_open() &&
507                     !packet_have_data_to_write()) {
508                         /* clear mask since we did not call select() */
509                         memset(*readsetp, 0, *nallocp);
510                         memset(*writesetp, 0, *nallocp);
511                         return;
512                 } else {
513                         FD_SET(connection_in, *readsetp);
514                 }
515         }
516
517         /* Select server connection if have data to write to the server. */
518         if (packet_have_data_to_write())
519                 FD_SET(connection_out, *writesetp);
520
521         if (control_fd != -1)
522                 FD_SET(control_fd, *readsetp);
523
524         /*
525          * Wait for something to happen.  This will suspend the process until
526          * some selected descriptor can be read, written, or has some other
527          * event pending.
528          */
529
530         if (options.server_alive_interval == 0 || !compat20)
531                 tvp = NULL;
532         else {
533                 tv.tv_sec = options.server_alive_interval;
534                 tv.tv_usec = 0;
535                 tvp = &tv;
536         }
537         ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
538         if (ret < 0) {
539                 char buf[100];
540
541                 /*
542                  * We have to clear the select masks, because we return.
543                  * We have to return, because the mainloop checks for the flags
544                  * set by the signal handlers.
545                  */
546                 memset(*readsetp, 0, *nallocp);
547                 memset(*writesetp, 0, *nallocp);
548
549                 if (errno == EINTR)
550                         return;
551                 /* Note: we might still have data in the buffers. */
552                 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
553                 buffer_append(&stderr_buffer, buf, strlen(buf));
554                 quit_pending = 1;
555         } else if (ret == 0)
556                 server_alive_check();
557 }
558
559 static void
560 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
561 {
562         /* Flush stdout and stderr buffers. */
563         if (buffer_len(bout) > 0)
564                 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
565         if (buffer_len(berr) > 0)
566                 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
567
568         leave_raw_mode();
569
570         /*
571          * Free (and clear) the buffer to reduce the amount of data that gets
572          * written to swap.
573          */
574         buffer_free(bin);
575         buffer_free(bout);
576         buffer_free(berr);
577
578         /* Send the suspend signal to the program itself. */
579         kill(getpid(), SIGTSTP);
580
581         /* Reset window sizes in case they have changed */
582         received_window_change_signal = 1;
583
584         /* OK, we have been continued by the user. Reinitialize buffers. */
585         buffer_init(bin);
586         buffer_init(bout);
587         buffer_init(berr);
588
589         enter_raw_mode();
590 }
591
592 static void
593 client_process_net_input(fd_set *readset)
594 {
595         int len;
596         char buf[8192];
597
598         /*
599          * Read input from the server, and add any such data to the buffer of
600          * the packet subsystem.
601          */
602         if (FD_ISSET(connection_in, readset)) {
603                 /* Read as much as possible. */
604                 len = read(connection_in, buf, sizeof(buf));
605                 if (len == 0) {
606                         /* Received EOF.  The remote host has closed the connection. */
607                         snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
608                                  host);
609                         buffer_append(&stderr_buffer, buf, strlen(buf));
610                         quit_pending = 1;
611                         return;
612                 }
613                 /*
614                  * There is a kernel bug on Solaris that causes select to
615                  * sometimes wake up even though there is no data available.
616                  */
617                 if (len < 0 && (errno == EAGAIN || errno == EINTR))
618                         len = 0;
619
620                 if (len < 0) {
621                         /* An error has encountered.  Perhaps there is a network problem. */
622                         snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
623                                  host, strerror(errno));
624                         buffer_append(&stderr_buffer, buf, strlen(buf));
625                         quit_pending = 1;
626                         return;
627                 }
628                 packet_process_incoming(buf, len);
629         }
630 }
631
632 static void
633 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
634 {
635         int id;
636         Channel *c;
637
638         id = packet_get_int();
639         packet_check_eom();
640
641         if ((c = channel_lookup(id)) == NULL) {
642                 error("%s: no channel for id %d", __func__, id);
643                 return;
644         }
645
646         if (type == SSH2_MSG_CHANNEL_SUCCESS)
647                 debug2("Request suceeded on channel %d", id);
648         else if (type == SSH2_MSG_CHANNEL_FAILURE) {
649                 error("Request failed on channel %d", id);
650                 channel_free(c);
651         }
652 }
653
654 static void
655 client_extra_session2_setup(int id, void *arg)
656 {
657         struct confirm_ctx *cctx = arg;
658         const char *display;
659         Channel *c;
660         int i;
661
662         if (cctx == NULL)
663                 fatal("%s: cctx == NULL", __func__);
664         if ((c = channel_lookup(id)) == NULL)
665                 fatal("%s: no channel for id %d", __func__, id);
666
667         display = getenv("DISPLAY");
668         if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
669                 char *proto, *data;
670                 /* Get reasonable local authentication information. */
671                 client_x11_get_proto(display, options.xauth_location,
672                     options.forward_x11_trusted, &proto, &data);
673                 /* Request forwarding with authentication spoofing. */
674                 debug("Requesting X11 forwarding with authentication spoofing.");
675                 x11_request_forwarding_with_spoofing(id, display, proto, data);
676                 /* XXX wait for reply */
677         }
678
679         if (cctx->want_agent_fwd && options.forward_agent) {
680                 debug("Requesting authentication agent forwarding.");
681                 channel_request_start(id, "auth-agent-req@openssh.com", 0);
682                 packet_send();
683         }
684
685         client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
686             cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
687             client_subsystem_reply);
688
689         c->confirm_ctx = NULL;
690         buffer_free(&cctx->cmd);
691         xfree(cctx->term);
692         if (cctx->env != NULL) {
693                 for (i = 0; cctx->env[i] != NULL; i++)
694                         xfree(cctx->env[i]);
695                 xfree(cctx->env);
696         }
697         xfree(cctx);
698 }
699
700 static void
701 client_process_control(fd_set *readset)
702 {
703         Buffer m;
704         Channel *c;
705         int client_fd, new_fd[3], ver, allowed;
706         socklen_t addrlen;
707         struct sockaddr_storage addr;
708         struct confirm_ctx *cctx;
709         char *cmd;
710         u_int i, len, env_len, command, flags;
711         uid_t euid;
712         gid_t egid;
713
714         /*
715          * Accept connection on control socket
716          */
717         if (control_fd == -1 || !FD_ISSET(control_fd, readset))
718                 return;
719
720         memset(&addr, 0, sizeof(addr));
721         addrlen = sizeof(addr);
722         if ((client_fd = accept(control_fd,
723             (struct sockaddr*)&addr, &addrlen)) == -1) {
724                 error("%s accept: %s", __func__, strerror(errno));
725                 return;
726         }
727
728         if (getpeereid(client_fd, &euid, &egid) < 0) {
729                 error("%s getpeereid failed: %s", __func__, strerror(errno));
730                 close(client_fd);
731                 return;
732         }
733         if ((euid != 0) && (getuid() != euid)) {
734                 error("control mode uid mismatch: peer euid %u != uid %u",
735                     (u_int) euid, (u_int) getuid());
736                 close(client_fd);
737                 return;
738         }
739
740         unset_nonblock(client_fd);
741
742         /* Read command */
743         buffer_init(&m);
744         if (ssh_msg_recv(client_fd, &m) == -1) {
745                 error("%s: client msg_recv failed", __func__);
746                 close(client_fd);
747                 buffer_free(&m);
748                 return;
749         }
750         if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
751                 error("%s: wrong client version %d", __func__, ver);
752                 buffer_free(&m);
753                 close(client_fd);
754                 return;
755         }
756
757         allowed = 1;
758         command = buffer_get_int(&m);
759         flags = buffer_get_int(&m);
760
761         buffer_clear(&m);
762
763         switch (command) {
764         case SSHMUX_COMMAND_OPEN:
765                 if (options.control_master == SSHCTL_MASTER_ASK ||
766                     options.control_master == SSHCTL_MASTER_AUTO_ASK)
767                         allowed = ask_permission("Allow shared connection "
768                             "to %s? ", host);
769                 /* continue below */
770                 break;
771         case SSHMUX_COMMAND_TERMINATE:
772                 if (options.control_master == SSHCTL_MASTER_ASK ||
773                     options.control_master == SSHCTL_MASTER_AUTO_ASK)
774                         allowed = ask_permission("Terminate shared connection "
775                             "to %s? ", host);
776                 if (allowed)
777                         quit_pending = 1;
778                 /* FALLTHROUGH */
779         case SSHMUX_COMMAND_ALIVE_CHECK:
780                 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
781                 buffer_clear(&m);
782                 buffer_put_int(&m, allowed);
783                 buffer_put_int(&m, getpid());
784                 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
785                         error("%s: client msg_send failed", __func__);
786                         close(client_fd);
787                         buffer_free(&m);
788                         return;
789                 }
790                 buffer_free(&m);
791                 close(client_fd);
792                 return;
793         default:
794                 error("Unsupported command %d", command);
795                 buffer_free(&m);
796                 close(client_fd);
797                 return;
798         }
799
800         /* Reply for SSHMUX_COMMAND_OPEN */
801         buffer_clear(&m);
802         buffer_put_int(&m, allowed);
803         buffer_put_int(&m, getpid());
804         if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
805                 error("%s: client msg_send failed", __func__);
806                 close(client_fd);
807                 buffer_free(&m);
808                 return;
809         }
810
811         if (!allowed) {
812                 error("Refused control connection");
813                 close(client_fd);
814                 buffer_free(&m);
815                 return;
816         }
817
818         buffer_clear(&m);
819         if (ssh_msg_recv(client_fd, &m) == -1) {
820                 error("%s: client msg_recv failed", __func__);
821                 close(client_fd);
822                 buffer_free(&m);
823                 return;
824         }
825         if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
826                 error("%s: wrong client version %d", __func__, ver);
827                 buffer_free(&m);
828                 close(client_fd);
829                 return;
830         }
831
832         cctx = xcalloc(1, sizeof(*cctx));
833         cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
834         cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
835         cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
836         cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
837         cctx->term = buffer_get_string(&m, &len);
838
839         cmd = buffer_get_string(&m, &len);
840         buffer_init(&cctx->cmd);
841         buffer_append(&cctx->cmd, cmd, strlen(cmd));
842
843         env_len = buffer_get_int(&m);
844         env_len = MIN(env_len, 4096);
845         debug3("%s: receiving %d env vars", __func__, env_len);
846         if (env_len != 0) {
847                 cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
848                 for (i = 0; i < env_len; i++)
849                         cctx->env[i] = buffer_get_string(&m, &len);
850                 cctx->env[i] = NULL;
851         }
852
853         debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
854             cctx->want_tty, cctx->want_subsys, cmd);
855         xfree(cmd);
856
857         /* Gather fds from client */
858         new_fd[0] = mm_receive_fd(client_fd);
859         new_fd[1] = mm_receive_fd(client_fd);
860         new_fd[2] = mm_receive_fd(client_fd);
861
862         debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
863             new_fd[0], new_fd[1], new_fd[2]);
864
865         /* Try to pick up ttymodes from client before it goes raw */
866         if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
867                 error("%s: tcgetattr: %s", __func__, strerror(errno));
868
869         /* This roundtrip is just for synchronisation of ttymodes */
870         buffer_clear(&m);
871         if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
872                 error("%s: client msg_send failed", __func__);
873                 close(client_fd);
874                 close(new_fd[0]);
875                 close(new_fd[1]);
876                 close(new_fd[2]);
877                 buffer_free(&m);
878                 xfree(cctx->term);
879                 if (env_len != 0) {
880                         for (i = 0; i < env_len; i++)
881                                 xfree(cctx->env[i]);
882                         xfree(cctx->env);
883                 }
884                 return;
885         }
886         buffer_free(&m);
887
888         /* enable nonblocking unless tty */
889         if (!isatty(new_fd[0]))
890                 set_nonblock(new_fd[0]);
891         if (!isatty(new_fd[1]))
892                 set_nonblock(new_fd[1]);
893         if (!isatty(new_fd[2]))
894                 set_nonblock(new_fd[2]);
895
896         set_nonblock(client_fd);
897
898         c = channel_new("session", SSH_CHANNEL_OPENING,
899             new_fd[0], new_fd[1], new_fd[2],
900             CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
901             CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
902
903         /* XXX */
904         c->ctl_fd = client_fd;
905
906         debug3("%s: channel_new: %d", __func__, c->self);
907
908         channel_send_open(c->self);
909         channel_register_confirm(c->self, client_extra_session2_setup, cctx);
910 }
911
912 static void
913 process_cmdline(void)
914 {
915         void (*handler)(int);
916         char *s, *cmd, *cancel_host;
917         int delete = 0;
918         int local = 0;
919         u_short cancel_port;
920         Forward fwd;
921
922         leave_raw_mode();
923         handler = signal(SIGINT, SIG_IGN);
924         cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
925         if (s == NULL)
926                 goto out;
927         while (*s && isspace(*s))
928                 s++;
929         if (*s == '-')
930                 s++;    /* Skip cmdline '-', if any */
931         if (*s == '\0')
932                 goto out;
933
934         if (*s == 'h' || *s == 'H' || *s == '?') {
935                 logit("Commands:");
936                 logit("      -L[bind_address:]port:host:hostport    "
937                     "Request local forward");
938                 logit("      -R[bind_address:]port:host:hostport    "
939                     "Request remote forward");
940                 logit("      -KR[bind_address:]port                 "
941                     "Cancel remote forward");
942                 if (!options.permit_local_command)
943                         goto out;
944                 logit("      !args                                  "
945                     "Execute local command");
946                 goto out;
947         }
948
949         if (*s == '!' && options.permit_local_command) {
950                 s++;
951                 ssh_local_cmd(s);
952                 goto out;
953         }
954
955         if (*s == 'K') {
956                 delete = 1;
957                 s++;
958         }
959         if (*s != 'L' && *s != 'R') {
960                 logit("Invalid command.");
961                 goto out;
962         }
963         if (*s == 'L')
964                 local = 1;
965         if (local && delete) {
966                 logit("Not supported.");
967                 goto out;
968         }
969         if ((!local || delete) && !compat20) {
970                 logit("Not supported for SSH protocol version 1.");
971                 goto out;
972         }
973
974         s++;
975         while (*s && isspace(*s))
976                 s++;
977
978         if (delete) {
979                 cancel_port = 0;
980                 cancel_host = hpdelim(&s);      /* may be NULL */
981                 if (s != NULL) {
982                         cancel_port = a2port(s);
983                         cancel_host = cleanhostname(cancel_host);
984                 } else {
985                         cancel_port = a2port(cancel_host);
986                         cancel_host = NULL;
987                 }
988                 if (cancel_port == 0) {
989                         logit("Bad forwarding close port");
990                         goto out;
991                 }
992                 channel_request_rforward_cancel(cancel_host, cancel_port);
993         } else {
994                 if (!parse_forward(&fwd, s)) {
995                         logit("Bad forwarding specification.");
996                         goto out;
997                 }
998                 if (local) {
999                         if (channel_setup_local_fwd_listener(fwd.listen_host,
1000                             fwd.listen_port, fwd.connect_host,
1001                             fwd.connect_port, options.gateway_ports) < 0) {
1002                                 logit("Port forwarding failed.");
1003                                 goto out;
1004                         }
1005                 } else {
1006                         if (channel_request_remote_forwarding(fwd.listen_host,
1007                             fwd.listen_port, fwd.connect_host,
1008                             fwd.connect_port) < 0) {
1009                                 logit("Port forwarding failed.");
1010                                 goto out;
1011                         }
1012                 }
1013
1014                 logit("Forwarding port.");
1015         }
1016
1017 out:
1018         signal(SIGINT, handler);
1019         enter_raw_mode();
1020         if (cmd)
1021                 xfree(cmd);
1022 }
1023
1024 /* process the characters one by one */
1025 static int
1026 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1027 {
1028         char string[1024];
1029         pid_t pid;
1030         int bytes = 0;
1031         u_int i;
1032         u_char ch;
1033         char *s;
1034
1035         if (len <= 0)
1036                 return (0);
1037
1038         for (i = 0; i < (u_int)len; i++) {
1039                 /* Get one character at a time. */
1040                 ch = buf[i];
1041
1042                 if (escape_pending) {
1043                         /* We have previously seen an escape character. */
1044                         /* Clear the flag now. */
1045                         escape_pending = 0;
1046
1047                         /* Process the escaped character. */
1048                         switch (ch) {
1049                         case '.':
1050                                 /* Terminate the connection. */
1051                                 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1052                                 buffer_append(berr, string, strlen(string));
1053
1054                                 quit_pending = 1;
1055                                 return -1;
1056
1057                         case 'Z' - 64:
1058                                 /* Suspend the program. */
1059                                 /* Print a message to that effect to the user. */
1060                                 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1061                                 buffer_append(berr, string, strlen(string));
1062
1063                                 /* Restore terminal modes and suspend. */
1064                                 client_suspend_self(bin, bout, berr);
1065
1066                                 /* We have been continued. */
1067                                 continue;
1068
1069                         case 'B':
1070                                 if (compat20) {
1071                                         snprintf(string, sizeof string,
1072                                             "%cB\r\n", escape_char);
1073                                         buffer_append(berr, string,
1074                                             strlen(string));
1075                                         channel_request_start(session_ident,
1076                                             "break", 0);
1077                                         packet_put_int(1000);
1078                                         packet_send();
1079                                 }
1080                                 continue;
1081
1082                         case 'R':
1083                                 if (compat20) {
1084                                         if (datafellows & SSH_BUG_NOREKEY)
1085                                                 logit("Server does not support re-keying");
1086                                         else
1087                                                 need_rekeying = 1;
1088                                 }
1089                                 continue;
1090
1091                         case '&':
1092                                 /*
1093                                  * Detach the program (continue to serve connections,
1094                                  * but put in background and no more new connections).
1095                                  */
1096                                 /* Restore tty modes. */
1097                                 leave_raw_mode();
1098
1099                                 /* Stop listening for new connections. */
1100                                 channel_stop_listening();
1101
1102                                 snprintf(string, sizeof string,
1103                                     "%c& [backgrounded]\n", escape_char);
1104                                 buffer_append(berr, string, strlen(string));
1105
1106                                 /* Fork into background. */
1107                                 pid = fork();
1108                                 if (pid < 0) {
1109                                         error("fork: %.100s", strerror(errno));
1110                                         continue;
1111                                 }
1112                                 if (pid != 0) { /* This is the parent. */
1113                                         /* The parent just exits. */
1114                                         exit(0);
1115                                 }
1116                                 /* The child continues serving connections. */
1117                                 if (compat20) {
1118                                         buffer_append(bin, "\004", 1);
1119                                         /* fake EOF on stdin */
1120                                         return -1;
1121                                 } else if (!stdin_eof) {
1122                                         /*
1123                                          * Sending SSH_CMSG_EOF alone does not always appear
1124                                          * to be enough.  So we try to send an EOF character
1125                                          * first.
1126                                          */
1127                                         packet_start(SSH_CMSG_STDIN_DATA);
1128                                         packet_put_string("\004", 1);
1129                                         packet_send();
1130                                         /* Close stdin. */
1131                                         stdin_eof = 1;
1132                                         if (buffer_len(bin) == 0) {
1133                                                 packet_start(SSH_CMSG_EOF);
1134                                                 packet_send();
1135                                         }
1136                                 }
1137                                 continue;
1138
1139                         case '?':
1140                                 snprintf(string, sizeof string,
1141 "%c?\r\n\
1142 Supported escape sequences:\r\n\
1143 %c.  - terminate connection\r\n\
1144 %cB  - send a BREAK to the remote system\r\n\
1145 %cC  - open a command line\r\n\
1146 %cR  - Request rekey (SSH protocol 2 only)\r\n\
1147 %c^Z - suspend ssh\r\n\
1148 %c#  - list forwarded connections\r\n\
1149 %c&  - background ssh (when waiting for connections to terminate)\r\n\
1150 %c?  - this message\r\n\
1151 %c%c  - send the escape character by typing it twice\r\n\
1152 (Note that escapes are only recognized immediately after newline.)\r\n",
1153                                     escape_char, escape_char, escape_char, escape_char,
1154                                     escape_char, escape_char, escape_char, escape_char,
1155                                     escape_char, escape_char, escape_char);
1156                                 buffer_append(berr, string, strlen(string));
1157                                 continue;
1158
1159                         case '#':
1160                                 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1161                                 buffer_append(berr, string, strlen(string));
1162                                 s = channel_open_message();
1163                                 buffer_append(berr, s, strlen(s));
1164                                 xfree(s);
1165                                 continue;
1166
1167                         case 'C':
1168                                 process_cmdline();
1169                                 continue;
1170
1171                         default:
1172                                 if (ch != escape_char) {
1173                                         buffer_put_char(bin, escape_char);
1174                                         bytes++;
1175                                 }
1176                                 /* Escaped characters fall through here */
1177                                 break;
1178                         }
1179                 } else {
1180                         /*
1181                          * The previous character was not an escape char. Check if this
1182                          * is an escape.
1183                          */
1184                         if (last_was_cr && ch == escape_char) {
1185                                 /* It is. Set the flag and continue to next character. */
1186                                 escape_pending = 1;
1187                                 continue;
1188                         }
1189                 }
1190
1191                 /*
1192                  * Normal character.  Record whether it was a newline,
1193                  * and append it to the buffer.
1194                  */
1195                 last_was_cr = (ch == '\r' || ch == '\n');
1196                 buffer_put_char(bin, ch);
1197                 bytes++;
1198         }
1199         return bytes;
1200 }
1201
1202 static void
1203 client_process_input(fd_set *readset)
1204 {
1205         int len;
1206         char buf[8192];
1207
1208         /* Read input from stdin. */
1209         if (FD_ISSET(fileno(stdin), readset)) {
1210                 /* Read as much as possible. */
1211                 len = read(fileno(stdin), buf, sizeof(buf));
1212                 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1213                         return;         /* we'll try again later */
1214                 if (len <= 0) {
1215                         /*
1216                          * Received EOF or error.  They are treated
1217                          * similarly, except that an error message is printed
1218                          * if it was an error condition.
1219                          */
1220                         if (len < 0) {
1221                                 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1222                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1223                         }
1224                         /* Mark that we have seen EOF. */
1225                         stdin_eof = 1;
1226                         /*
1227                          * Send an EOF message to the server unless there is
1228                          * data in the buffer.  If there is data in the
1229                          * buffer, no message will be sent now.  Code
1230                          * elsewhere will send the EOF when the buffer
1231                          * becomes empty if stdin_eof is set.
1232                          */
1233                         if (buffer_len(&stdin_buffer) == 0) {
1234                                 packet_start(SSH_CMSG_EOF);
1235                                 packet_send();
1236                         }
1237                 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1238                         /*
1239                          * Normal successful read, and no escape character.
1240                          * Just append the data to buffer.
1241                          */
1242                         buffer_append(&stdin_buffer, buf, len);
1243                 } else {
1244                         /*
1245                          * Normal, successful read.  But we have an escape character
1246                          * and have to process the characters one by one.
1247                          */
1248                         if (process_escapes(&stdin_buffer, &stdout_buffer,
1249                             &stderr_buffer, buf, len) == -1)
1250                                 return;
1251                 }
1252         }
1253 }
1254
1255 static void
1256 client_process_output(fd_set *writeset)
1257 {
1258         int len;
1259         char buf[100];
1260
1261         /* Write buffered output to stdout. */
1262         if (FD_ISSET(fileno(stdout), writeset)) {
1263                 /* Write as much data as possible. */
1264                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1265                     buffer_len(&stdout_buffer));
1266                 if (len <= 0) {
1267                         if (errno == EINTR || errno == EAGAIN)
1268                                 len = 0;
1269                         else {
1270                                 /*
1271                                  * An error or EOF was encountered.  Put an
1272                                  * error message to stderr buffer.
1273                                  */
1274                                 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1275                                 buffer_append(&stderr_buffer, buf, strlen(buf));
1276                                 quit_pending = 1;
1277                                 return;
1278                         }
1279                 }
1280                 /* Consume printed data from the buffer. */
1281                 buffer_consume(&stdout_buffer, len);
1282                 stdout_bytes += len;
1283         }
1284         /* Write buffered output to stderr. */
1285         if (FD_ISSET(fileno(stderr), writeset)) {
1286                 /* Write as much data as possible. */
1287                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1288                     buffer_len(&stderr_buffer));
1289                 if (len <= 0) {
1290                         if (errno == EINTR || errno == EAGAIN)
1291                                 len = 0;
1292                         else {
1293                                 /* EOF or error, but can't even print error message. */
1294                                 quit_pending = 1;
1295                                 return;
1296                         }
1297                 }
1298                 /* Consume printed characters from the buffer. */
1299                 buffer_consume(&stderr_buffer, len);
1300                 stderr_bytes += len;
1301         }
1302 }
1303
1304 /*
1305  * Get packets from the connection input buffer, and process them as long as
1306  * there are packets available.
1307  *
1308  * Any unknown packets received during the actual
1309  * session cause the session to terminate.  This is
1310  * intended to make debugging easier since no
1311  * confirmations are sent.  Any compatible protocol
1312  * extensions must be negotiated during the
1313  * preparatory phase.
1314  */
1315
1316 static void
1317 client_process_buffered_input_packets(void)
1318 {
1319         dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1320 }
1321
1322 /* scan buf[] for '~' before sending data to the peer */
1323
1324 static int
1325 simple_escape_filter(Channel *c, char *buf, int len)
1326 {
1327         /* XXX we assume c->extended is writeable */
1328         return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1329 }
1330
1331 static void
1332 client_channel_closed(int id, void *arg)
1333 {
1334         channel_cancel_cleanup(id);
1335         session_closed = 1;
1336         leave_raw_mode();
1337 }
1338
1339 /*
1340  * Implements the interactive session with the server.  This is called after
1341  * the user has been authenticated, and a command has been started on the
1342  * remote host.  If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1343  * used as an escape character for terminating or suspending the session.
1344  */
1345
1346 int
1347 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1348 {
1349         fd_set *readset = NULL, *writeset = NULL;
1350         double start_time, total_time;
1351         int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1352         u_int nalloc = 0;
1353         char buf[100];
1354
1355         debug("Entering interactive session.");
1356
1357         start_time = get_current_time();
1358
1359         /* Initialize variables. */
1360         escape_pending = 0;
1361         last_was_cr = 1;
1362         exit_status = -1;
1363         stdin_eof = 0;
1364         buffer_high = 64 * 1024;
1365         connection_in = packet_get_connection_in();
1366         connection_out = packet_get_connection_out();
1367         max_fd = MAX(connection_in, connection_out);
1368         if (control_fd != -1)
1369                 max_fd = MAX(max_fd, control_fd);
1370
1371         if (!compat20) {
1372                 /* enable nonblocking unless tty */
1373                 if (!isatty(fileno(stdin)))
1374                         set_nonblock(fileno(stdin));
1375                 if (!isatty(fileno(stdout)))
1376                         set_nonblock(fileno(stdout));
1377                 if (!isatty(fileno(stderr)))
1378                         set_nonblock(fileno(stderr));
1379                 max_fd = MAX(max_fd, fileno(stdin));
1380                 max_fd = MAX(max_fd, fileno(stdout));
1381                 max_fd = MAX(max_fd, fileno(stderr));
1382         }
1383         stdin_bytes = 0;
1384         stdout_bytes = 0;
1385         stderr_bytes = 0;
1386         quit_pending = 0;
1387         escape_char = escape_char_arg;
1388
1389         /* Initialize buffers. */
1390         buffer_init(&stdin_buffer);
1391         buffer_init(&stdout_buffer);
1392         buffer_init(&stderr_buffer);
1393
1394         client_init_dispatch();
1395
1396         /*
1397          * Set signal handlers, (e.g. to restore non-blocking mode)
1398          * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1399          */
1400         if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1401                 signal(SIGHUP, signal_handler);
1402         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1403                 signal(SIGINT, signal_handler);
1404         if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1405                 signal(SIGQUIT, signal_handler);
1406         if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1407                 signal(SIGTERM, signal_handler);
1408         signal(SIGWINCH, window_change_handler);
1409
1410         if (have_pty)
1411                 enter_raw_mode();
1412
1413         if (compat20) {
1414                 session_ident = ssh2_chan_id;
1415                 if (escape_char != SSH_ESCAPECHAR_NONE)
1416                         channel_register_filter(session_ident,
1417                             simple_escape_filter, NULL);
1418                 if (session_ident != -1)
1419                         channel_register_cleanup(session_ident,
1420                             client_channel_closed, 0);
1421         } else {
1422                 /* Check if we should immediately send eof on stdin. */
1423                 client_check_initial_eof_on_stdin();
1424         }
1425
1426         /* Main loop of the client for the interactive session mode. */
1427         while (!quit_pending) {
1428
1429                 /* Process buffered packets sent by the server. */
1430                 client_process_buffered_input_packets();
1431
1432                 if (compat20 && session_closed && !channel_still_open())
1433                         break;
1434
1435                 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1436
1437                 if (rekeying) {
1438                         debug("rekeying in progress");
1439                 } else {
1440                         /*
1441                          * Make packets of buffered stdin data, and buffer
1442                          * them for sending to the server.
1443                          */
1444                         if (!compat20)
1445                                 client_make_packets_from_stdin_data();
1446
1447                         /*
1448                          * Make packets from buffered channel data, and
1449                          * enqueue them for sending to the server.
1450                          */
1451                         if (packet_not_very_much_data_to_write())
1452                                 channel_output_poll();
1453
1454                         /*
1455                          * Check if the window size has changed, and buffer a
1456                          * message about it to the server if so.
1457                          */
1458                         client_check_window_change();
1459
1460                         if (quit_pending)
1461                                 break;
1462                 }
1463                 /*
1464                  * Wait until we have something to do (something becomes
1465                  * available on one of the descriptors).
1466                  */
1467                 max_fd2 = max_fd;
1468                 client_wait_until_can_do_something(&readset, &writeset,
1469                     &max_fd2, &nalloc, rekeying);
1470
1471                 if (quit_pending)
1472                         break;
1473
1474                 /* Do channel operations unless rekeying in progress. */
1475                 if (!rekeying) {
1476                         channel_after_select(readset, writeset);
1477                         if (need_rekeying || packet_need_rekeying()) {
1478                                 debug("need rekeying");
1479                                 xxx_kex->done = 0;
1480                                 kex_send_kexinit(xxx_kex);
1481                                 need_rekeying = 0;
1482                         }
1483                 }
1484
1485                 /* Buffer input from the connection.  */
1486                 client_process_net_input(readset);
1487
1488                 /* Accept control connections.  */
1489                 client_process_control(readset);
1490
1491                 if (quit_pending)
1492                         break;
1493
1494                 if (!compat20) {
1495                         /* Buffer data from stdin */
1496                         client_process_input(readset);
1497                         /*
1498                          * Process output to stdout and stderr.  Output to
1499                          * the connection is processed elsewhere (above).
1500                          */
1501                         client_process_output(writeset);
1502                 }
1503
1504                 /* Send as much buffered packet data as possible to the sender. */
1505                 if (FD_ISSET(connection_out, writeset))
1506                         packet_write_poll();
1507         }
1508         if (readset)
1509                 xfree(readset);
1510         if (writeset)
1511                 xfree(writeset);
1512
1513         /* Terminate the session. */
1514
1515         /* Stop watching for window change. */
1516         signal(SIGWINCH, SIG_DFL);
1517
1518         channel_free_all();
1519
1520         if (have_pty)
1521                 leave_raw_mode();
1522
1523         /* restore blocking io */
1524         if (!isatty(fileno(stdin)))
1525                 unset_nonblock(fileno(stdin));
1526         if (!isatty(fileno(stdout)))
1527                 unset_nonblock(fileno(stdout));
1528         if (!isatty(fileno(stderr)))
1529                 unset_nonblock(fileno(stderr));
1530
1531         /*
1532          * If there was no shell or command requested, there will be no remote
1533          * exit status to be returned.  In that case, clear error code if the
1534          * connection was deliberately terminated at this end.
1535          */
1536         if (no_shell_flag && received_signal == SIGTERM) {
1537                 received_signal = 0;
1538                 exit_status = 0;
1539         }
1540
1541         if (received_signal)
1542                 fatal("Killed by signal %d.", (int) received_signal);
1543
1544         /*
1545          * In interactive mode (with pseudo tty) display a message indicating
1546          * that the connection has been closed.
1547          */
1548         if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1549                 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1550                 buffer_append(&stderr_buffer, buf, strlen(buf));
1551         }
1552
1553         /* Output any buffered data for stdout. */
1554         while (buffer_len(&stdout_buffer) > 0) {
1555                 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1556                     buffer_len(&stdout_buffer));
1557                 if (len <= 0) {
1558                         error("Write failed flushing stdout buffer.");
1559                         break;
1560                 }
1561                 buffer_consume(&stdout_buffer, len);
1562                 stdout_bytes += len;
1563         }
1564
1565         /* Output any buffered data for stderr. */
1566         while (buffer_len(&stderr_buffer) > 0) {
1567                 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1568                     buffer_len(&stderr_buffer));
1569                 if (len <= 0) {
1570                         error("Write failed flushing stderr buffer.");
1571                         break;
1572                 }
1573                 buffer_consume(&stderr_buffer, len);
1574                 stderr_bytes += len;
1575         }
1576
1577         /* Clear and free any buffers. */
1578         memset(buf, 0, sizeof(buf));
1579         buffer_free(&stdin_buffer);
1580         buffer_free(&stdout_buffer);
1581         buffer_free(&stderr_buffer);
1582
1583         /* Report bytes transferred, and transfer rates. */
1584         total_time = get_current_time() - start_time;
1585         debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1586             stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1587         if (total_time > 0)
1588                 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1589                     stdin_bytes / total_time, stdout_bytes / total_time,
1590                     stderr_bytes / total_time);
1591
1592         /* Return the exit status of the program. */
1593         debug("Exit status %d", exit_status);
1594         return exit_status;
1595 }
1596
1597 /*********/
1598
1599 static void
1600 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1601 {
1602         u_int data_len;
1603         char *data = packet_get_string(&data_len);
1604         packet_check_eom();
1605         buffer_append(&stdout_buffer, data, data_len);
1606         memset(data, 0, data_len);
1607         xfree(data);
1608 }
1609 static void
1610 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1611 {
1612         u_int data_len;
1613         char *data = packet_get_string(&data_len);
1614         packet_check_eom();
1615         buffer_append(&stderr_buffer, data, data_len);
1616         memset(data, 0, data_len);
1617         xfree(data);
1618 }
1619 static void
1620 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1621 {
1622         exit_status = packet_get_int();
1623         packet_check_eom();
1624         /* Acknowledge the exit. */
1625         packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1626         packet_send();
1627         /*
1628          * Must wait for packet to be sent since we are
1629          * exiting the loop.
1630          */
1631         packet_write_wait();
1632         /* Flag that we want to exit. */
1633         quit_pending = 1;
1634 }
1635 static void
1636 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1637 {
1638         Channel *c = NULL;
1639         int remote_id, sock;
1640
1641         /* Read the remote channel number from the message. */
1642         remote_id = packet_get_int();
1643         packet_check_eom();
1644
1645         /*
1646          * Get a connection to the local authentication agent (this may again
1647          * get forwarded).
1648          */
1649         sock = ssh_get_authentication_socket();
1650
1651         /*
1652          * If we could not connect the agent, send an error message back to
1653          * the server. This should never happen unless the agent dies,
1654          * because authentication forwarding is only enabled if we have an
1655          * agent.
1656          */
1657         if (sock >= 0) {
1658                 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1659                     -1, 0, 0, 0, "authentication agent connection", 1);
1660                 c->remote_id = remote_id;
1661                 c->force_drain = 1;
1662         }
1663         if (c == NULL) {
1664                 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1665                 packet_put_int(remote_id);
1666         } else {
1667                 /* Send a confirmation to the remote host. */
1668                 debug("Forwarding authentication connection.");
1669                 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1670                 packet_put_int(remote_id);
1671                 packet_put_int(c->self);
1672         }
1673         packet_send();
1674 }
1675
1676 static Channel *
1677 client_request_forwarded_tcpip(const char *request_type, int rchan)
1678 {
1679         Channel *c = NULL;
1680         char *listen_address, *originator_address;
1681         int listen_port, originator_port;
1682         int sock;
1683
1684         /* Get rest of the packet */
1685         listen_address = packet_get_string(NULL);
1686         listen_port = packet_get_int();
1687         originator_address = packet_get_string(NULL);
1688         originator_port = packet_get_int();
1689         packet_check_eom();
1690
1691         debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1692             listen_address, listen_port, originator_address, originator_port);
1693
1694         sock = channel_connect_by_listen_address(listen_port);
1695         if (sock < 0) {
1696                 xfree(originator_address);
1697                 xfree(listen_address);
1698                 return NULL;
1699         }
1700         c = channel_new("forwarded-tcpip",
1701             SSH_CHANNEL_CONNECTING, sock, sock, -1,
1702             CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1703             originator_address, 1);
1704         xfree(originator_address);
1705         xfree(listen_address);
1706         return c;
1707 }
1708
1709 static Channel *
1710 client_request_x11(const char *request_type, int rchan)
1711 {
1712         Channel *c = NULL;
1713         char *originator;
1714         int originator_port;
1715         int sock;
1716
1717         if (!options.forward_x11) {
1718                 error("Warning: ssh server tried X11 forwarding.");
1719                 error("Warning: this is probably a break-in attempt by a malicious server.");
1720                 return NULL;
1721         }
1722         originator = packet_get_string(NULL);
1723         if (datafellows & SSH_BUG_X11FWD) {
1724                 debug2("buggy server: x11 request w/o originator_port");
1725                 originator_port = 0;
1726         } else {
1727                 originator_port = packet_get_int();
1728         }
1729         packet_check_eom();
1730         /* XXX check permission */
1731         debug("client_request_x11: request from %s %d", originator,
1732             originator_port);
1733         xfree(originator);
1734         sock = x11_connect_display();
1735         if (sock < 0)
1736                 return NULL;
1737         c = channel_new("x11",
1738             SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1739             CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1740         c->force_drain = 1;
1741         return c;
1742 }
1743
1744 static Channel *
1745 client_request_agent(const char *request_type, int rchan)
1746 {
1747         Channel *c = NULL;
1748         int sock;
1749
1750         if (!options.forward_agent) {
1751                 error("Warning: ssh server tried agent forwarding.");
1752                 error("Warning: this is probably a break-in attempt by a malicious server.");
1753                 return NULL;
1754         }
1755         sock =  ssh_get_authentication_socket();
1756         if (sock < 0)
1757                 return NULL;
1758         c = channel_new("authentication agent connection",
1759             SSH_CHANNEL_OPEN, sock, sock, -1,
1760             CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1761             "authentication agent connection", 1);
1762         c->force_drain = 1;
1763         return c;
1764 }
1765
1766 /* XXXX move to generic input handler */
1767 static void
1768 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1769 {
1770         Channel *c = NULL;
1771         char *ctype;
1772         int rchan;
1773         u_int rmaxpack, rwindow, len;
1774
1775         ctype = packet_get_string(&len);
1776         rchan = packet_get_int();
1777         rwindow = packet_get_int();
1778         rmaxpack = packet_get_int();
1779
1780         debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1781             ctype, rchan, rwindow, rmaxpack);
1782
1783         if (strcmp(ctype, "forwarded-tcpip") == 0) {
1784                 c = client_request_forwarded_tcpip(ctype, rchan);
1785         } else if (strcmp(ctype, "x11") == 0) {
1786                 c = client_request_x11(ctype, rchan);
1787         } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1788                 c = client_request_agent(ctype, rchan);
1789         }
1790 /* XXX duplicate : */
1791         if (c != NULL) {
1792                 debug("confirm %s", ctype);
1793                 c->remote_id = rchan;
1794                 c->remote_window = rwindow;
1795                 c->remote_maxpacket = rmaxpack;
1796                 if (c->type != SSH_CHANNEL_CONNECTING) {
1797                         packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1798                         packet_put_int(c->remote_id);
1799                         packet_put_int(c->self);
1800                         packet_put_int(c->local_window);
1801                         packet_put_int(c->local_maxpacket);
1802                         packet_send();
1803                 }
1804         } else {
1805                 debug("failure %s", ctype);
1806                 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1807                 packet_put_int(rchan);
1808                 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1809                 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1810                         packet_put_cstring("open failed");
1811                         packet_put_cstring("");
1812                 }
1813                 packet_send();
1814         }
1815         xfree(ctype);
1816 }
1817 static void
1818 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1819 {
1820         Channel *c = NULL;
1821         int exitval, id, reply, success = 0;
1822         char *rtype;
1823
1824         id = packet_get_int();
1825         rtype = packet_get_string(NULL);
1826         reply = packet_get_char();
1827
1828         debug("client_input_channel_req: channel %d rtype %s reply %d",
1829             id, rtype, reply);
1830
1831         if (id == -1) {
1832                 error("client_input_channel_req: request for channel -1");
1833         } else if ((c = channel_lookup(id)) == NULL) {
1834                 error("client_input_channel_req: channel %d: unknown channel", id);
1835         } else if (strcmp(rtype, "exit-status") == 0) {
1836                 exitval = packet_get_int();
1837                 if (id == session_ident) {
1838                         success = 1;
1839                         exit_status = exitval;
1840                 } else if (c->ctl_fd == -1) {
1841                         error("client_input_channel_req: unexpected channel %d",
1842                             session_ident);
1843                 } else {
1844                         atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1845                         success = 1;
1846                 }
1847                 packet_check_eom();
1848         }
1849         if (reply) {
1850                 packet_start(success ?
1851                     SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1852                 packet_put_int(id);
1853                 packet_send();
1854         }
1855         xfree(rtype);
1856 }
1857 static void
1858 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1859 {
1860         char *rtype;
1861         int want_reply;
1862         int success = 0;
1863
1864         rtype = packet_get_string(NULL);
1865         want_reply = packet_get_char();
1866         debug("client_input_global_request: rtype %s want_reply %d",
1867             rtype, want_reply);
1868         if (want_reply) {
1869                 packet_start(success ?
1870                     SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1871                 packet_send();
1872                 packet_write_wait();
1873         }
1874         xfree(rtype);
1875 }
1876
1877 void
1878 client_session2_setup(int id, int want_tty, int want_subsystem,
1879     const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1880     dispatch_fn *subsys_repl)
1881 {
1882         int len;
1883         Channel *c = NULL;
1884
1885         debug2("%s: id %d", __func__, id);
1886
1887         if ((c = channel_lookup(id)) == NULL)
1888                 fatal("client_session2_setup: channel %d: unknown channel", id);
1889
1890         if (want_tty) {
1891                 struct winsize ws;
1892                 struct termios tio;
1893
1894                 /* Store window size in the packet. */
1895                 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1896                         memset(&ws, 0, sizeof(ws));
1897
1898                 channel_request_start(id, "pty-req", 0);
1899                 packet_put_cstring(term != NULL ? term : "");
1900                 packet_put_int((u_int)ws.ws_col);
1901                 packet_put_int((u_int)ws.ws_row);
1902                 packet_put_int((u_int)ws.ws_xpixel);
1903                 packet_put_int((u_int)ws.ws_ypixel);
1904                 tio = get_saved_tio();
1905                 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1906                 packet_send();
1907                 /* XXX wait for reply */
1908                 c->client_tty = 1;
1909         }
1910
1911         /* Transfer any environment variables from client to server */
1912         if (options.num_send_env != 0 && env != NULL) {
1913                 int i, j, matched;
1914                 char *name, *val;
1915
1916                 debug("Sending environment.");
1917                 for (i = 0; env[i] != NULL; i++) {
1918                         /* Split */
1919                         name = xstrdup(env[i]);
1920                         if ((val = strchr(name, '=')) == NULL) {
1921                                 xfree(name);
1922                                 continue;
1923                         }
1924                         *val++ = '\0';
1925
1926                         matched = 0;
1927                         for (j = 0; j < options.num_send_env; j++) {
1928                                 if (match_pattern(name, options.send_env[j])) {
1929                                         matched = 1;
1930                                         break;
1931                                 }
1932                         }
1933                         if (!matched) {
1934                                 debug3("Ignored env %s", name);
1935                                 xfree(name);
1936                                 continue;
1937                         }
1938
1939                         debug("Sending env %s = %s", name, val);
1940                         channel_request_start(id, "env", 0);
1941                         packet_put_cstring(name);
1942                         packet_put_cstring(val);
1943                         packet_send();
1944                         xfree(name);
1945                 }
1946         }
1947
1948         len = buffer_len(cmd);
1949         if (len > 0) {
1950                 if (len > 900)
1951                         len = 900;
1952                 if (want_subsystem) {
1953                         debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1954                         channel_request_start(id, "subsystem", subsys_repl != NULL);
1955                         if (subsys_repl != NULL) {
1956                                 /* register callback for reply */
1957                                 /* XXX we assume that client_loop has already been called */
1958                                 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1959                                 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1960                         }
1961                 } else {
1962                         debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1963                         channel_request_start(id, "exec", 0);
1964                 }
1965                 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1966                 packet_send();
1967         } else {
1968                 channel_request_start(id, "shell", 0);
1969                 packet_send();
1970         }
1971 }
1972
1973 static void
1974 client_init_dispatch_20(void)
1975 {
1976         dispatch_init(&dispatch_protocol_error);
1977
1978         dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1979         dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1980         dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1981         dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1982         dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1983         dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1984         dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1985         dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1986         dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1987         dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1988
1989         /* rekeying */
1990         dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1991
1992         /* global request reply messages */
1993         dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1994         dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1995 }
1996 static void
1997 client_init_dispatch_13(void)
1998 {
1999         dispatch_init(NULL);
2000         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2001         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2002         dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2003         dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2004         dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2005         dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2006         dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2007         dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2008         dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2009
2010         dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2011             &client_input_agent_open : &deny_input_open);
2012         dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2013             &x11_input_open : &deny_input_open);
2014 }
2015 static void
2016 client_init_dispatch_15(void)
2017 {
2018         client_init_dispatch_13();
2019         dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2020         dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2021 }
2022 static void
2023 client_init_dispatch(void)
2024 {
2025         if (compat20)
2026                 client_init_dispatch_20();
2027         else if (compat13)
2028                 client_init_dispatch_13();
2029         else
2030                 client_init_dispatch_15();
2031 }
2032
2033 /* client specific fatal cleanup */
2034 void
2035 cleanup_exit(int i)
2036 {
2037         leave_raw_mode();
2038         leave_non_blocking();
2039         if (options.control_path != NULL && control_fd != -1)
2040                 unlink(options.control_path);
2041         _exit(i);
2042 }
This page took 0.438756 seconds and 3 git commands to generate.