xref: /freebsd/crypto/openssh/serverloop.c (revision b6a05070fa77edc7ce6e60b61623fd806e807be6)
1 /* $OpenBSD: serverloop.c,v 1.170 2014/02/02 03:44:31 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  * Server main loop for handling the interactive session.
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  * SSH2 support by Markus Friedl.
15  * Copyright (c) 2000, 2001 Markus Friedl.  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 #include "includes.h"
39 __RCSID("$FreeBSD$");
40 
41 #include <sys/types.h>
42 #include <sys/param.h>
43 #include <sys/wait.h>
44 #include <sys/socket.h>
45 #ifdef HAVE_SYS_TIME_H
46 # include <sys/time.h>
47 #endif
48 
49 #include <netinet/in.h>
50 
51 #include <errno.h>
52 #include <fcntl.h>
53 #include <pwd.h>
54 #include <signal.h>
55 #include <string.h>
56 #include <termios.h>
57 #include <unistd.h>
58 #include <stdarg.h>
59 
60 #include "openbsd-compat/sys-queue.h"
61 #include "xmalloc.h"
62 #include "packet.h"
63 #include "buffer.h"
64 #include "log.h"
65 #include "servconf.h"
66 #include "canohost.h"
67 #include "sshpty.h"
68 #include "channels.h"
69 #include "compat.h"
70 #include "ssh1.h"
71 #include "ssh2.h"
72 #include "key.h"
73 #include "cipher.h"
74 #include "kex.h"
75 #include "hostfile.h"
76 #include "auth.h"
77 #include "session.h"
78 #include "dispatch.h"
79 #include "auth-options.h"
80 #include "serverloop.h"
81 #include "misc.h"
82 #include "roaming.h"
83 
84 extern ServerOptions options;
85 
86 /* XXX */
87 extern Kex *xxx_kex;
88 extern Authctxt *the_authctxt;
89 extern int use_privsep;
90 
91 static Buffer stdin_buffer;	/* Buffer for stdin data. */
92 static Buffer stdout_buffer;	/* Buffer for stdout data. */
93 static Buffer stderr_buffer;	/* Buffer for stderr data. */
94 static int fdin;		/* Descriptor for stdin (for writing) */
95 static int fdout;		/* Descriptor for stdout (for reading);
96 				   May be same number as fdin. */
97 static int fderr;		/* Descriptor for stderr.  May be -1. */
98 static long stdin_bytes = 0;	/* Number of bytes written to stdin. */
99 static long stdout_bytes = 0;	/* Number of stdout bytes sent to client. */
100 static long stderr_bytes = 0;	/* Number of stderr bytes sent to client. */
101 static long fdout_bytes = 0;	/* Number of stdout bytes read from program. */
102 static int stdin_eof = 0;	/* EOF message received from client. */
103 static int fdout_eof = 0;	/* EOF encountered reading from fdout. */
104 static int fderr_eof = 0;	/* EOF encountered readung from fderr. */
105 static int fdin_is_tty = 0;	/* fdin points to a tty. */
106 static int connection_in;	/* Connection to client (input). */
107 static int connection_out;	/* Connection to client (output). */
108 static int connection_closed = 0;	/* Connection to client closed. */
109 static u_int buffer_high;	/* "Soft" max buffer size. */
110 static int no_more_sessions = 0; /* Disallow further sessions. */
111 
112 /*
113  * This SIGCHLD kludge is used to detect when the child exits.  The server
114  * will exit after that, as soon as forwarded connections have terminated.
115  */
116 
117 static volatile sig_atomic_t child_terminated = 0;	/* The child has terminated. */
118 
119 /* Cleanup on signals (!use_privsep case only) */
120 static volatile sig_atomic_t received_sigterm = 0;
121 
122 /* prototypes */
123 static void server_init_dispatch(void);
124 
125 /*
126  * we write to this pipe if a SIGCHLD is caught in order to avoid
127  * the race between select() and child_terminated
128  */
129 static int notify_pipe[2];
130 static void
131 notify_setup(void)
132 {
133 	if (pipe(notify_pipe) < 0) {
134 		error("pipe(notify_pipe) failed %s", strerror(errno));
135 	} else if ((fcntl(notify_pipe[0], F_SETFD, FD_CLOEXEC) == -1) ||
136 	    (fcntl(notify_pipe[1], F_SETFD, FD_CLOEXEC) == -1)) {
137 		error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno));
138 		close(notify_pipe[0]);
139 		close(notify_pipe[1]);
140 	} else {
141 		set_nonblock(notify_pipe[0]);
142 		set_nonblock(notify_pipe[1]);
143 		return;
144 	}
145 	notify_pipe[0] = -1;	/* read end */
146 	notify_pipe[1] = -1;	/* write end */
147 }
148 static void
149 notify_parent(void)
150 {
151 	if (notify_pipe[1] != -1)
152 		(void)write(notify_pipe[1], "", 1);
153 }
154 static void
155 notify_prepare(fd_set *readset)
156 {
157 	if (notify_pipe[0] != -1)
158 		FD_SET(notify_pipe[0], readset);
159 }
160 static void
161 notify_done(fd_set *readset)
162 {
163 	char c;
164 
165 	if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset))
166 		while (read(notify_pipe[0], &c, 1) != -1)
167 			debug2("notify_done: reading");
168 }
169 
170 /*ARGSUSED*/
171 static void
172 sigchld_handler(int sig)
173 {
174 	int save_errno = errno;
175 	child_terminated = 1;
176 #ifndef _UNICOS
177 	mysignal(SIGCHLD, sigchld_handler);
178 #endif
179 	notify_parent();
180 	errno = save_errno;
181 }
182 
183 /*ARGSUSED*/
184 static void
185 sigterm_handler(int sig)
186 {
187 	received_sigterm = sig;
188 }
189 
190 /*
191  * Make packets from buffered stderr data, and buffer it for sending
192  * to the client.
193  */
194 static void
195 make_packets_from_stderr_data(void)
196 {
197 	u_int len;
198 
199 	/* Send buffered stderr data to the client. */
200 	while (buffer_len(&stderr_buffer) > 0 &&
201 	    packet_not_very_much_data_to_write()) {
202 		len = buffer_len(&stderr_buffer);
203 		if (packet_is_interactive()) {
204 			if (len > 512)
205 				len = 512;
206 		} else {
207 			/* Keep the packets at reasonable size. */
208 			if (len > packet_get_maxsize())
209 				len = packet_get_maxsize();
210 		}
211 		packet_start(SSH_SMSG_STDERR_DATA);
212 		packet_put_string(buffer_ptr(&stderr_buffer), len);
213 		packet_send();
214 		buffer_consume(&stderr_buffer, len);
215 		stderr_bytes += len;
216 	}
217 }
218 
219 /*
220  * Make packets from buffered stdout data, and buffer it for sending to the
221  * client.
222  */
223 static void
224 make_packets_from_stdout_data(void)
225 {
226 	u_int len;
227 
228 	/* Send buffered stdout data to the client. */
229 	while (buffer_len(&stdout_buffer) > 0 &&
230 	    packet_not_very_much_data_to_write()) {
231 		len = buffer_len(&stdout_buffer);
232 		if (packet_is_interactive()) {
233 			if (len > 512)
234 				len = 512;
235 		} else {
236 			/* Keep the packets at reasonable size. */
237 			if (len > packet_get_maxsize())
238 				len = packet_get_maxsize();
239 		}
240 		packet_start(SSH_SMSG_STDOUT_DATA);
241 		packet_put_string(buffer_ptr(&stdout_buffer), len);
242 		packet_send();
243 		buffer_consume(&stdout_buffer, len);
244 		stdout_bytes += len;
245 	}
246 }
247 
248 static void
249 client_alive_check(void)
250 {
251 	int channel_id;
252 
253 	/* timeout, check to see how many we have had */
254 	if (packet_inc_alive_timeouts() > options.client_alive_count_max) {
255 		logit("Timeout, client not responding.");
256 		cleanup_exit(255);
257 	}
258 
259 	/*
260 	 * send a bogus global/channel request with "wantreply",
261 	 * we should get back a failure
262 	 */
263 	if ((channel_id = channel_find_open()) == -1) {
264 		packet_start(SSH2_MSG_GLOBAL_REQUEST);
265 		packet_put_cstring("keepalive@openssh.com");
266 		packet_put_char(1);	/* boolean: want reply */
267 	} else {
268 		channel_request_start(channel_id, "keepalive@openssh.com", 1);
269 	}
270 	packet_send();
271 }
272 
273 /*
274  * Sleep in select() until we can do something.  This will initialize the
275  * select masks.  Upon return, the masks will indicate which descriptors
276  * have data or can accept data.  Optionally, a maximum time can be specified
277  * for the duration of the wait (0 = infinite).
278  */
279 static void
280 wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
281     u_int *nallocp, u_int64_t max_time_milliseconds)
282 {
283 	struct timeval tv, *tvp;
284 	int ret;
285 	time_t minwait_secs = 0;
286 	int client_alive_scheduled = 0;
287 	int program_alive_scheduled = 0;
288 
289 	/* Allocate and update select() masks for channel descriptors. */
290 	channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
291 	    &minwait_secs, 0);
292 
293 	if (minwait_secs != 0)
294 		max_time_milliseconds = MIN(max_time_milliseconds,
295 		    (u_int)minwait_secs * 1000);
296 
297 	/*
298 	 * if using client_alive, set the max timeout accordingly,
299 	 * and indicate that this particular timeout was for client
300 	 * alive by setting the client_alive_scheduled flag.
301 	 *
302 	 * this could be randomized somewhat to make traffic
303 	 * analysis more difficult, but we're not doing it yet.
304 	 */
305 	if (compat20 &&
306 	    max_time_milliseconds == 0 && options.client_alive_interval) {
307 		client_alive_scheduled = 1;
308 		max_time_milliseconds =
309 		    (u_int64_t)options.client_alive_interval * 1000;
310 	}
311 
312 	if (compat20) {
313 #if 0
314 		/* wrong: bad condition XXX */
315 		if (channel_not_very_much_buffered_data())
316 #endif
317 		FD_SET(connection_in, *readsetp);
318 	} else {
319 		/*
320 		 * Read packets from the client unless we have too much
321 		 * buffered stdin or channel data.
322 		 */
323 		if (buffer_len(&stdin_buffer) < buffer_high &&
324 		    channel_not_very_much_buffered_data())
325 			FD_SET(connection_in, *readsetp);
326 		/*
327 		 * If there is not too much data already buffered going to
328 		 * the client, try to get some more data from the program.
329 		 */
330 		if (packet_not_very_much_data_to_write()) {
331 			program_alive_scheduled = child_terminated;
332 			if (!fdout_eof)
333 				FD_SET(fdout, *readsetp);
334 			if (!fderr_eof)
335 				FD_SET(fderr, *readsetp);
336 		}
337 		/*
338 		 * If we have buffered data, try to write some of that data
339 		 * to the program.
340 		 */
341 		if (fdin != -1 && buffer_len(&stdin_buffer) > 0)
342 			FD_SET(fdin, *writesetp);
343 	}
344 	notify_prepare(*readsetp);
345 
346 	/*
347 	 * If we have buffered packet data going to the client, mark that
348 	 * descriptor.
349 	 */
350 	if (packet_have_data_to_write())
351 		FD_SET(connection_out, *writesetp);
352 
353 	/*
354 	 * If child has terminated and there is enough buffer space to read
355 	 * from it, then read as much as is available and exit.
356 	 */
357 	if (child_terminated && packet_not_very_much_data_to_write())
358 		if (max_time_milliseconds == 0 || client_alive_scheduled)
359 			max_time_milliseconds = 100;
360 
361 	if (max_time_milliseconds == 0)
362 		tvp = NULL;
363 	else {
364 		tv.tv_sec = max_time_milliseconds / 1000;
365 		tv.tv_usec = 1000 * (max_time_milliseconds % 1000);
366 		tvp = &tv;
367 	}
368 
369 	/* Wait for something to happen, or the timeout to expire. */
370 	ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
371 
372 	if (ret == -1) {
373 		memset(*readsetp, 0, *nallocp);
374 		memset(*writesetp, 0, *nallocp);
375 		if (errno != EINTR)
376 			error("select: %.100s", strerror(errno));
377 	} else {
378 		if (ret == 0 && client_alive_scheduled)
379 			client_alive_check();
380 		if (!compat20 && program_alive_scheduled && fdin_is_tty) {
381 			if (!fdout_eof)
382 				FD_SET(fdout, *readsetp);
383 			if (!fderr_eof)
384 				FD_SET(fderr, *readsetp);
385 		}
386 	}
387 
388 	notify_done(*readsetp);
389 }
390 
391 /*
392  * Processes input from the client and the program.  Input data is stored
393  * in buffers and processed later.
394  */
395 static void
396 process_input(fd_set *readset)
397 {
398 	int len;
399 	char buf[16384];
400 
401 	/* Read and buffer any input data from the client. */
402 	if (FD_ISSET(connection_in, readset)) {
403 		int cont = 0;
404 		len = roaming_read(connection_in, buf, sizeof(buf), &cont);
405 		if (len == 0) {
406 			if (cont)
407 				return;
408 			verbose("Connection closed by %.100s",
409 			    get_remote_ipaddr());
410 			connection_closed = 1;
411 			if (compat20)
412 				return;
413 			cleanup_exit(255);
414 		} else if (len < 0) {
415 			if (errno != EINTR && errno != EAGAIN &&
416 			    errno != EWOULDBLOCK) {
417 				verbose("Read error from remote host "
418 				    "%.100s: %.100s",
419 				    get_remote_ipaddr(), strerror(errno));
420 				cleanup_exit(255);
421 			}
422 		} else {
423 			/* Buffer any received data. */
424 			packet_process_incoming(buf, len);
425 		}
426 	}
427 	if (compat20)
428 		return;
429 
430 	/* Read and buffer any available stdout data from the program. */
431 	if (!fdout_eof && FD_ISSET(fdout, readset)) {
432 		errno = 0;
433 		len = read(fdout, buf, sizeof(buf));
434 		if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
435 		    errno == EWOULDBLOCK) && !child_terminated))) {
436 			/* do nothing */
437 #ifndef PTY_ZEROREAD
438 		} else if (len <= 0) {
439 #else
440 		} else if ((!isatty(fdout) && len <= 0) ||
441 		    (isatty(fdout) && (len < 0 || (len == 0 && errno != 0)))) {
442 #endif
443 			fdout_eof = 1;
444 		} else {
445 			buffer_append(&stdout_buffer, buf, len);
446 			fdout_bytes += len;
447 		}
448 	}
449 	/* Read and buffer any available stderr data from the program. */
450 	if (!fderr_eof && FD_ISSET(fderr, readset)) {
451 		errno = 0;
452 		len = read(fderr, buf, sizeof(buf));
453 		if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
454 		    errno == EWOULDBLOCK) && !child_terminated))) {
455 			/* do nothing */
456 #ifndef PTY_ZEROREAD
457 		} else if (len <= 0) {
458 #else
459 		} else if ((!isatty(fderr) && len <= 0) ||
460 		    (isatty(fderr) && (len < 0 || (len == 0 && errno != 0)))) {
461 #endif
462 			fderr_eof = 1;
463 		} else {
464 			buffer_append(&stderr_buffer, buf, len);
465 		}
466 	}
467 }
468 
469 /*
470  * Sends data from internal buffers to client program stdin.
471  */
472 static void
473 process_output(fd_set *writeset)
474 {
475 	struct termios tio;
476 	u_char *data;
477 	u_int dlen;
478 	int len;
479 
480 	/* Write buffered data to program stdin. */
481 	if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) {
482 		data = buffer_ptr(&stdin_buffer);
483 		dlen = buffer_len(&stdin_buffer);
484 		len = write(fdin, data, dlen);
485 		if (len < 0 &&
486 		    (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) {
487 			/* do nothing */
488 		} else if (len <= 0) {
489 			if (fdin != fdout)
490 				close(fdin);
491 			else
492 				shutdown(fdin, SHUT_WR); /* We will no longer send. */
493 			fdin = -1;
494 		} else {
495 			/* Successful write. */
496 			if (fdin_is_tty && dlen >= 1 && data[0] != '\r' &&
497 			    tcgetattr(fdin, &tio) == 0 &&
498 			    !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
499 				/*
500 				 * Simulate echo to reduce the impact of
501 				 * traffic analysis
502 				 */
503 				packet_send_ignore(len);
504 				packet_send();
505 			}
506 			/* Consume the data from the buffer. */
507 			buffer_consume(&stdin_buffer, len);
508 			/* Update the count of bytes written to the program. */
509 			stdin_bytes += len;
510 		}
511 	}
512 	/* Send any buffered packet data to the client. */
513 	if (FD_ISSET(connection_out, writeset))
514 		packet_write_poll();
515 }
516 
517 /*
518  * Wait until all buffered output has been sent to the client.
519  * This is used when the program terminates.
520  */
521 static void
522 drain_output(void)
523 {
524 	/* Send any buffered stdout data to the client. */
525 	if (buffer_len(&stdout_buffer) > 0) {
526 		packet_start(SSH_SMSG_STDOUT_DATA);
527 		packet_put_string(buffer_ptr(&stdout_buffer),
528 				  buffer_len(&stdout_buffer));
529 		packet_send();
530 		/* Update the count of sent bytes. */
531 		stdout_bytes += buffer_len(&stdout_buffer);
532 	}
533 	/* Send any buffered stderr data to the client. */
534 	if (buffer_len(&stderr_buffer) > 0) {
535 		packet_start(SSH_SMSG_STDERR_DATA);
536 		packet_put_string(buffer_ptr(&stderr_buffer),
537 				  buffer_len(&stderr_buffer));
538 		packet_send();
539 		/* Update the count of sent bytes. */
540 		stderr_bytes += buffer_len(&stderr_buffer);
541 	}
542 	/* Wait until all buffered data has been written to the client. */
543 	packet_write_wait();
544 }
545 
546 static void
547 process_buffered_input_packets(void)
548 {
549 	dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL);
550 }
551 
552 /*
553  * Performs the interactive session.  This handles data transmission between
554  * the client and the program.  Note that the notion of stdin, stdout, and
555  * stderr in this function is sort of reversed: this function writes to
556  * stdin (of the child program), and reads from stdout and stderr (of the
557  * child program).
558  */
559 void
560 server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
561 {
562 	fd_set *readset = NULL, *writeset = NULL;
563 	int max_fd = 0;
564 	u_int nalloc = 0;
565 	int wait_status;	/* Status returned by wait(). */
566 	pid_t wait_pid;		/* pid returned by wait(). */
567 	int waiting_termination = 0;	/* Have displayed waiting close message. */
568 	u_int64_t max_time_milliseconds;
569 	u_int previous_stdout_buffer_bytes;
570 	u_int stdout_buffer_bytes;
571 	int type;
572 
573 	debug("Entering interactive session.");
574 
575 	/* Initialize the SIGCHLD kludge. */
576 	child_terminated = 0;
577 	mysignal(SIGCHLD, sigchld_handler);
578 
579 	if (!use_privsep) {
580 		signal(SIGTERM, sigterm_handler);
581 		signal(SIGINT, sigterm_handler);
582 		signal(SIGQUIT, sigterm_handler);
583 	}
584 
585 	/* Initialize our global variables. */
586 	fdin = fdin_arg;
587 	fdout = fdout_arg;
588 	fderr = fderr_arg;
589 
590 	/* nonblocking IO */
591 	set_nonblock(fdin);
592 	set_nonblock(fdout);
593 	/* we don't have stderr for interactive terminal sessions, see below */
594 	if (fderr != -1)
595 		set_nonblock(fderr);
596 
597 	if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin))
598 		fdin_is_tty = 1;
599 
600 	connection_in = packet_get_connection_in();
601 	connection_out = packet_get_connection_out();
602 
603 	notify_setup();
604 
605 	previous_stdout_buffer_bytes = 0;
606 
607 	/* Set approximate I/O buffer size. */
608 	if (packet_is_interactive())
609 		buffer_high = 4096;
610 	else
611 		buffer_high = 64 * 1024;
612 
613 #if 0
614 	/* Initialize max_fd to the maximum of the known file descriptors. */
615 	max_fd = MAX(connection_in, connection_out);
616 	max_fd = MAX(max_fd, fdin);
617 	max_fd = MAX(max_fd, fdout);
618 	if (fderr != -1)
619 		max_fd = MAX(max_fd, fderr);
620 #endif
621 
622 	/* Initialize Initialize buffers. */
623 	buffer_init(&stdin_buffer);
624 	buffer_init(&stdout_buffer);
625 	buffer_init(&stderr_buffer);
626 
627 	/*
628 	 * If we have no separate fderr (which is the case when we have a pty
629 	 * - there we cannot make difference between data sent to stdout and
630 	 * stderr), indicate that we have seen an EOF from stderr.  This way
631 	 * we don't need to check the descriptor everywhere.
632 	 */
633 	if (fderr == -1)
634 		fderr_eof = 1;
635 
636 	server_init_dispatch();
637 
638 	/* Main loop of the server for the interactive session mode. */
639 	for (;;) {
640 
641 		/* Process buffered packets from the client. */
642 		process_buffered_input_packets();
643 
644 		/*
645 		 * If we have received eof, and there is no more pending
646 		 * input data, cause a real eof by closing fdin.
647 		 */
648 		if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) {
649 			if (fdin != fdout)
650 				close(fdin);
651 			else
652 				shutdown(fdin, SHUT_WR); /* We will no longer send. */
653 			fdin = -1;
654 		}
655 		/* Make packets from buffered stderr data to send to the client. */
656 		make_packets_from_stderr_data();
657 
658 		/*
659 		 * Make packets from buffered stdout data to send to the
660 		 * client. If there is very little to send, this arranges to
661 		 * not send them now, but to wait a short while to see if we
662 		 * are getting more data. This is necessary, as some systems
663 		 * wake up readers from a pty after each separate character.
664 		 */
665 		max_time_milliseconds = 0;
666 		stdout_buffer_bytes = buffer_len(&stdout_buffer);
667 		if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 &&
668 		    stdout_buffer_bytes != previous_stdout_buffer_bytes) {
669 			/* try again after a while */
670 			max_time_milliseconds = 10;
671 		} else {
672 			/* Send it now. */
673 			make_packets_from_stdout_data();
674 		}
675 		previous_stdout_buffer_bytes = buffer_len(&stdout_buffer);
676 
677 		/* Send channel data to the client. */
678 		if (packet_not_very_much_data_to_write())
679 			channel_output_poll();
680 
681 		/*
682 		 * Bail out of the loop if the program has closed its output
683 		 * descriptors, and we have no more data to send to the
684 		 * client, and there is no pending buffered data.
685 		 */
686 		if (fdout_eof && fderr_eof && !packet_have_data_to_write() &&
687 		    buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) {
688 			if (!channel_still_open())
689 				break;
690 			if (!waiting_termination) {
691 				const char *s = "Waiting for forwarded connections to terminate...\r\n";
692 				char *cp;
693 				waiting_termination = 1;
694 				buffer_append(&stderr_buffer, s, strlen(s));
695 
696 				/* Display list of open channels. */
697 				cp = channel_open_message();
698 				buffer_append(&stderr_buffer, cp, strlen(cp));
699 				free(cp);
700 			}
701 		}
702 		max_fd = MAX(connection_in, connection_out);
703 		max_fd = MAX(max_fd, fdin);
704 		max_fd = MAX(max_fd, fdout);
705 		max_fd = MAX(max_fd, fderr);
706 		max_fd = MAX(max_fd, notify_pipe[0]);
707 
708 		/* Sleep in select() until we can do something. */
709 		wait_until_can_do_something(&readset, &writeset, &max_fd,
710 		    &nalloc, max_time_milliseconds);
711 
712 		if (received_sigterm) {
713 			logit("Exiting on signal %d", (int)received_sigterm);
714 			/* Clean up sessions, utmp, etc. */
715 			cleanup_exit(255);
716 		}
717 
718 		/* Process any channel events. */
719 		channel_after_select(readset, writeset);
720 
721 		/* Process input from the client and from program stdout/stderr. */
722 		process_input(readset);
723 
724 		/* Process output to the client and to program stdin. */
725 		process_output(writeset);
726 	}
727 	free(readset);
728 	free(writeset);
729 
730 	/* Cleanup and termination code. */
731 
732 	/* Wait until all output has been sent to the client. */
733 	drain_output();
734 
735 	debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.",
736 	    stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes);
737 
738 	/* Free and clear the buffers. */
739 	buffer_free(&stdin_buffer);
740 	buffer_free(&stdout_buffer);
741 	buffer_free(&stderr_buffer);
742 
743 	/* Close the file descriptors. */
744 	if (fdout != -1)
745 		close(fdout);
746 	fdout = -1;
747 	fdout_eof = 1;
748 	if (fderr != -1)
749 		close(fderr);
750 	fderr = -1;
751 	fderr_eof = 1;
752 	if (fdin != -1)
753 		close(fdin);
754 	fdin = -1;
755 
756 	channel_free_all();
757 
758 	/* We no longer want our SIGCHLD handler to be called. */
759 	mysignal(SIGCHLD, SIG_DFL);
760 
761 	while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0)
762 		if (errno != EINTR)
763 			packet_disconnect("wait: %.100s", strerror(errno));
764 	if (wait_pid != pid)
765 		error("Strange, wait returned pid %ld, expected %ld",
766 		    (long)wait_pid, (long)pid);
767 
768 	/* Check if it exited normally. */
769 	if (WIFEXITED(wait_status)) {
770 		/* Yes, normal exit.  Get exit status and send it to the client. */
771 		debug("Command exited with status %d.", WEXITSTATUS(wait_status));
772 		packet_start(SSH_SMSG_EXITSTATUS);
773 		packet_put_int(WEXITSTATUS(wait_status));
774 		packet_send();
775 		packet_write_wait();
776 
777 		/*
778 		 * Wait for exit confirmation.  Note that there might be
779 		 * other packets coming before it; however, the program has
780 		 * already died so we just ignore them.  The client is
781 		 * supposed to respond with the confirmation when it receives
782 		 * the exit status.
783 		 */
784 		do {
785 			type = packet_read();
786 		}
787 		while (type != SSH_CMSG_EXIT_CONFIRMATION);
788 
789 		debug("Received exit confirmation.");
790 		return;
791 	}
792 	/* Check if the program terminated due to a signal. */
793 	if (WIFSIGNALED(wait_status))
794 		packet_disconnect("Command terminated on signal %d.",
795 				  WTERMSIG(wait_status));
796 
797 	/* Some weird exit cause.  Just exit. */
798 	packet_disconnect("wait returned status %04x.", wait_status);
799 	/* NOTREACHED */
800 }
801 
802 static void
803 collect_children(void)
804 {
805 	pid_t pid;
806 	sigset_t oset, nset;
807 	int status;
808 
809 	/* block SIGCHLD while we check for dead children */
810 	sigemptyset(&nset);
811 	sigaddset(&nset, SIGCHLD);
812 	sigprocmask(SIG_BLOCK, &nset, &oset);
813 	if (child_terminated) {
814 		debug("Received SIGCHLD.");
815 		while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
816 		    (pid < 0 && errno == EINTR))
817 			if (pid > 0)
818 				session_close_by_pid(pid, status);
819 		child_terminated = 0;
820 	}
821 	sigprocmask(SIG_SETMASK, &oset, NULL);
822 }
823 
824 void
825 server_loop2(Authctxt *authctxt)
826 {
827 	fd_set *readset = NULL, *writeset = NULL;
828 	int rekeying = 0, max_fd;
829 	u_int nalloc = 0;
830 	u_int64_t rekey_timeout_ms = 0;
831 
832 	debug("Entering interactive session for SSH2.");
833 
834 	mysignal(SIGCHLD, sigchld_handler);
835 	child_terminated = 0;
836 	connection_in = packet_get_connection_in();
837 	connection_out = packet_get_connection_out();
838 
839 	if (!use_privsep) {
840 		signal(SIGTERM, sigterm_handler);
841 		signal(SIGINT, sigterm_handler);
842 		signal(SIGQUIT, sigterm_handler);
843 	}
844 
845 	notify_setup();
846 
847 	max_fd = MAX(connection_in, connection_out);
848 	max_fd = MAX(max_fd, notify_pipe[0]);
849 
850 	server_init_dispatch();
851 
852 	for (;;) {
853 		process_buffered_input_packets();
854 
855 		rekeying = (xxx_kex != NULL && !xxx_kex->done);
856 
857 		if (!rekeying && packet_not_very_much_data_to_write())
858 			channel_output_poll();
859 		if (options.rekey_interval > 0 && compat20 && !rekeying)
860 			rekey_timeout_ms = packet_get_rekey_timeout() * 1000;
861 		else
862 			rekey_timeout_ms = 0;
863 
864 		wait_until_can_do_something(&readset, &writeset, &max_fd,
865 		    &nalloc, rekey_timeout_ms);
866 
867 		if (received_sigterm) {
868 			logit("Exiting on signal %d", (int)received_sigterm);
869 			/* Clean up sessions, utmp, etc. */
870 			cleanup_exit(255);
871 		}
872 
873 		collect_children();
874 		if (!rekeying) {
875 			channel_after_select(readset, writeset);
876 			if (packet_need_rekeying()) {
877 				debug("need rekeying");
878 				xxx_kex->done = 0;
879 				kex_send_kexinit(xxx_kex);
880 			}
881 		}
882 		process_input(readset);
883 		if (connection_closed)
884 			break;
885 		process_output(writeset);
886 	}
887 	collect_children();
888 
889 	free(readset);
890 	free(writeset);
891 
892 	/* free all channels, no more reads and writes */
893 	channel_free_all();
894 
895 	/* free remaining sessions, e.g. remove wtmp entries */
896 	session_destroy_all(NULL);
897 }
898 
899 static void
900 server_input_keep_alive(int type, u_int32_t seq, void *ctxt)
901 {
902 	debug("Got %d/%u for keepalive", type, seq);
903 	/*
904 	 * reset timeout, since we got a sane answer from the client.
905 	 * even if this was generated by something other than
906 	 * the bogus CHANNEL_REQUEST we send for keepalives.
907 	 */
908 	packet_set_alive_timeouts(0);
909 }
910 
911 static void
912 server_input_stdin_data(int type, u_int32_t seq, void *ctxt)
913 {
914 	char *data;
915 	u_int data_len;
916 
917 	/* Stdin data from the client.  Append it to the buffer. */
918 	/* Ignore any data if the client has closed stdin. */
919 	if (fdin == -1)
920 		return;
921 	data = packet_get_string(&data_len);
922 	packet_check_eom();
923 	buffer_append(&stdin_buffer, data, data_len);
924 	explicit_bzero(data, data_len);
925 	free(data);
926 }
927 
928 static void
929 server_input_eof(int type, u_int32_t seq, void *ctxt)
930 {
931 	/*
932 	 * Eof from the client.  The stdin descriptor to the
933 	 * program will be closed when all buffered data has
934 	 * drained.
935 	 */
936 	debug("EOF received for stdin.");
937 	packet_check_eom();
938 	stdin_eof = 1;
939 }
940 
941 static void
942 server_input_window_size(int type, u_int32_t seq, void *ctxt)
943 {
944 	u_int row = packet_get_int();
945 	u_int col = packet_get_int();
946 	u_int xpixel = packet_get_int();
947 	u_int ypixel = packet_get_int();
948 
949 	debug("Window change received.");
950 	packet_check_eom();
951 	if (fdin != -1)
952 		pty_change_window_size(fdin, row, col, xpixel, ypixel);
953 }
954 
955 static Channel *
956 server_request_direct_tcpip(void)
957 {
958 	Channel *c = NULL;
959 	char *target, *originator;
960 	u_short target_port, originator_port;
961 
962 	target = packet_get_string(NULL);
963 	target_port = packet_get_int();
964 	originator = packet_get_string(NULL);
965 	originator_port = packet_get_int();
966 	packet_check_eom();
967 
968 	debug("server_request_direct_tcpip: originator %s port %d, target %s "
969 	    "port %d", originator, originator_port, target, target_port);
970 
971 	/* XXX fine grained permissions */
972 	if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0 &&
973 	    !no_port_forwarding_flag) {
974 		c = channel_connect_to(target, target_port,
975 		    "direct-tcpip", "direct-tcpip");
976 	} else {
977 		logit("refused local port forward: "
978 		    "originator %s port %d, target %s port %d",
979 		    originator, originator_port, target, target_port);
980 	}
981 
982 	free(originator);
983 	free(target);
984 
985 	return c;
986 }
987 
988 static Channel *
989 server_request_tun(void)
990 {
991 	Channel *c = NULL;
992 	int mode, tun;
993 	int sock;
994 
995 	mode = packet_get_int();
996 	switch (mode) {
997 	case SSH_TUNMODE_POINTOPOINT:
998 	case SSH_TUNMODE_ETHERNET:
999 		break;
1000 	default:
1001 		packet_send_debug("Unsupported tunnel device mode.");
1002 		return NULL;
1003 	}
1004 	if ((options.permit_tun & mode) == 0) {
1005 		packet_send_debug("Server has rejected tunnel device "
1006 		    "forwarding");
1007 		return NULL;
1008 	}
1009 
1010 	tun = packet_get_int();
1011 	if (forced_tun_device != -1) {
1012 		if (tun != SSH_TUNID_ANY && forced_tun_device != tun)
1013 			goto done;
1014 		tun = forced_tun_device;
1015 	}
1016 	sock = tun_open(tun, mode);
1017 	if (sock < 0)
1018 		goto done;
1019 	if (options.hpn_disabled)
1020 		c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1,
1021 		    CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1022 		    "tun", 1);
1023 	else
1024 		c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1,
1025 		    options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT, 0,
1026 		    "tun", 1);
1027 	c->datagram = 1;
1028 #if defined(SSH_TUN_FILTER)
1029 	if (mode == SSH_TUNMODE_POINTOPOINT)
1030 		channel_register_filter(c->self, sys_tun_infilter,
1031 		    sys_tun_outfilter, NULL, NULL);
1032 #endif
1033 
1034  done:
1035 	if (c == NULL)
1036 		packet_send_debug("Failed to open the tunnel device.");
1037 	return c;
1038 }
1039 
1040 static Channel *
1041 server_request_session(void)
1042 {
1043 	Channel *c;
1044 
1045 	debug("input_session_request");
1046 	packet_check_eom();
1047 
1048 	if (no_more_sessions) {
1049 		packet_disconnect("Possible attack: attempt to open a session "
1050 		    "after additional sessions disabled");
1051 	}
1052 
1053 	/*
1054 	 * A server session has no fd to read or write until a
1055 	 * CHANNEL_REQUEST for a shell is made, so we set the type to
1056 	 * SSH_CHANNEL_LARVAL.  Additionally, a callback for handling all
1057 	 * CHANNEL_REQUEST messages is registered.
1058 	 */
1059 	c = channel_new("session", SSH_CHANNEL_LARVAL,
1060 	    -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT,
1061 	    0, "server-session", 1);
1062 	if (!options.hpn_disabled && options.tcp_rcv_buf_poll)
1063 		c->dynamic_window = 1;
1064 	if (session_open(the_authctxt, c->self) != 1) {
1065 		debug("session open failed, free channel %d", c->self);
1066 		channel_free(c);
1067 		return NULL;
1068 	}
1069 	channel_register_cleanup(c->self, session_close_by_channel, 0);
1070 	return c;
1071 }
1072 
1073 static void
1074 server_input_channel_open(int type, u_int32_t seq, void *ctxt)
1075 {
1076 	Channel *c = NULL;
1077 	char *ctype;
1078 	int rchan;
1079 	u_int rmaxpack, rwindow, len;
1080 
1081 	ctype = packet_get_string(&len);
1082 	rchan = packet_get_int();
1083 	rwindow = packet_get_int();
1084 	rmaxpack = packet_get_int();
1085 
1086 	debug("server_input_channel_open: ctype %s rchan %d win %d max %d",
1087 	    ctype, rchan, rwindow, rmaxpack);
1088 
1089 	if (strcmp(ctype, "session") == 0) {
1090 		c = server_request_session();
1091 	} else if (strcmp(ctype, "direct-tcpip") == 0) {
1092 		c = server_request_direct_tcpip();
1093 	} else if (strcmp(ctype, "tun@openssh.com") == 0) {
1094 		c = server_request_tun();
1095 	}
1096 	if (c != NULL) {
1097 		debug("server_input_channel_open: confirm %s", ctype);
1098 		c->remote_id = rchan;
1099 		c->remote_window = rwindow;
1100 		c->remote_maxpacket = rmaxpack;
1101 		if (c->type != SSH_CHANNEL_CONNECTING) {
1102 			packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1103 			packet_put_int(c->remote_id);
1104 			packet_put_int(c->self);
1105 			packet_put_int(c->local_window);
1106 			packet_put_int(c->local_maxpacket);
1107 			packet_send();
1108 		}
1109 	} else {
1110 		debug("server_input_channel_open: failure %s", ctype);
1111 		packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1112 		packet_put_int(rchan);
1113 		packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1114 		if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1115 			packet_put_cstring("open failed");
1116 			packet_put_cstring("");
1117 		}
1118 		packet_send();
1119 	}
1120 	free(ctype);
1121 }
1122 
1123 static void
1124 server_input_global_request(int type, u_int32_t seq, void *ctxt)
1125 {
1126 	char *rtype;
1127 	int want_reply;
1128 	int success = 0, allocated_listen_port = 0;
1129 
1130 	rtype = packet_get_string(NULL);
1131 	want_reply = packet_get_char();
1132 	debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply);
1133 
1134 	/* -R style forwarding */
1135 	if (strcmp(rtype, "tcpip-forward") == 0) {
1136 		struct passwd *pw;
1137 		char *listen_address;
1138 		u_short listen_port;
1139 
1140 		pw = the_authctxt->pw;
1141 		if (pw == NULL || !the_authctxt->valid)
1142 			fatal("server_input_global_request: no/invalid user");
1143 		listen_address = packet_get_string(NULL);
1144 		listen_port = (u_short)packet_get_int();
1145 		debug("server_input_global_request: tcpip-forward listen %s port %d",
1146 		    listen_address, listen_port);
1147 
1148 		/* check permissions */
1149 		if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0 ||
1150 		    no_port_forwarding_flag ||
1151 		    (!want_reply && listen_port == 0)
1152 #ifndef NO_IPPORT_RESERVED_CONCEPT
1153 		    || (listen_port != 0 && listen_port < IPPORT_RESERVED &&
1154                     pw->pw_uid != 0)
1155 #endif
1156 		    ) {
1157 			success = 0;
1158 			packet_send_debug("Server has disabled port forwarding.");
1159 		} else {
1160 			/* Start listening on the port */
1161 			success = channel_setup_remote_fwd_listener(
1162 			    listen_address, listen_port,
1163 			    &allocated_listen_port, options.gateway_ports);
1164 		}
1165 		free(listen_address);
1166 	} else if (strcmp(rtype, "cancel-tcpip-forward") == 0) {
1167 		char *cancel_address;
1168 		u_short cancel_port;
1169 
1170 		cancel_address = packet_get_string(NULL);
1171 		cancel_port = (u_short)packet_get_int();
1172 		debug("%s: cancel-tcpip-forward addr %s port %d", __func__,
1173 		    cancel_address, cancel_port);
1174 
1175 		success = channel_cancel_rport_listener(cancel_address,
1176 		    cancel_port);
1177 		free(cancel_address);
1178 	} else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) {
1179 		no_more_sessions = 1;
1180 		success = 1;
1181 	}
1182 	if (want_reply) {
1183 		packet_start(success ?
1184 		    SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1185 		if (success && allocated_listen_port > 0)
1186 			packet_put_int(allocated_listen_port);
1187 		packet_send();
1188 		packet_write_wait();
1189 	}
1190 	free(rtype);
1191 }
1192 
1193 static void
1194 server_input_channel_req(int type, u_int32_t seq, void *ctxt)
1195 {
1196 	Channel *c;
1197 	int id, reply, success = 0;
1198 	char *rtype;
1199 
1200 	id = packet_get_int();
1201 	rtype = packet_get_string(NULL);
1202 	reply = packet_get_char();
1203 
1204 	debug("server_input_channel_req: channel %d request %s reply %d",
1205 	    id, rtype, reply);
1206 
1207 	if ((c = channel_lookup(id)) == NULL)
1208 		packet_disconnect("server_input_channel_req: "
1209 		    "unknown channel %d", id);
1210 	if (!strcmp(rtype, "eow@openssh.com")) {
1211 		packet_check_eom();
1212 		chan_rcvd_eow(c);
1213 	} else if ((c->type == SSH_CHANNEL_LARVAL ||
1214 	    c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0)
1215 		success = session_input_channel_req(c, rtype);
1216 	if (reply) {
1217 		packet_start(success ?
1218 		    SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1219 		packet_put_int(c->remote_id);
1220 		packet_send();
1221 	}
1222 	free(rtype);
1223 }
1224 
1225 static void
1226 server_init_dispatch_20(void)
1227 {
1228 	debug("server_init_dispatch_20");
1229 	dispatch_init(&dispatch_protocol_error);
1230 	dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1231 	dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1232 	dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1233 	dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1234 	dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open);
1235 	dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1236 	dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1237 	dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req);
1238 	dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1239 	dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request);
1240 	/* client_alive */
1241 	dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive);
1242 	dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive);
1243 	dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive);
1244 	dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive);
1245 	/* rekeying */
1246 	dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1247 }
1248 static void
1249 server_init_dispatch_13(void)
1250 {
1251 	debug("server_init_dispatch_13");
1252 	dispatch_init(NULL);
1253 	dispatch_set(SSH_CMSG_EOF, &server_input_eof);
1254 	dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data);
1255 	dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size);
1256 	dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1257 	dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1258 	dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1259 	dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1260 	dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1261 	dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1262 }
1263 static void
1264 server_init_dispatch_15(void)
1265 {
1266 	server_init_dispatch_13();
1267 	debug("server_init_dispatch_15");
1268 	dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1269 	dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose);
1270 }
1271 static void
1272 server_init_dispatch(void)
1273 {
1274 	if (compat20)
1275 		server_init_dispatch_20();
1276 	else if (compat13)
1277 		server_init_dispatch_13();
1278 	else
1279 		server_init_dispatch_15();
1280 }
1281