blob: 53cb67d7bb5821425462275906f62bbf3950ccac [file] [log] [blame]
Darren Tuckerf7288d72009-06-21 18:12:20 +10001/* $OpenBSD: serverloop.c,v 1.158 2009/05/25 06:48:01 andreas Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Server main loop for handling the interactive session.
Damien Millere4340be2000-09-16 13:29:08 +11007 *
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 *
Damien Millerefb4afe2000-04-12 18:45:05 +100014 * SSH2 support by Markus Friedl.
Ben Lindstrom44697232001-07-04 03:32:30 +000015 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110016 *
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.
Damien Millerefb4afe2000-04-12 18:45:05 +100036 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100037
38#include "includes.h"
Damien Miller9cf6d072006-03-15 11:29:24 +110039
40#include <sys/types.h>
Damien Miller8dbffe72006-08-05 11:02:17 +100041#include <sys/param.h>
Damien Miller9cf6d072006-03-15 11:29:24 +110042#include <sys/wait.h>
Damien Miller8ec8c3e2006-07-10 20:35:38 +100043#include <sys/socket.h>
Damien Miller9aec9192006-08-05 10:57:45 +100044#ifdef HAVE_SYS_TIME_H
45# include <sys/time.h>
46#endif
Damien Miller8ec8c3e2006-07-10 20:35:38 +100047
48#include <netinet/in.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110049
Darren Tucker39972492006-07-12 22:22:46 +100050#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100051#include <fcntl.h>
Damien Miller9f2abc42006-07-10 20:53:08 +100052#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110053#include <signal.h>
Damien Millere3476ed2006-07-24 14:13:33 +100054#include <string.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110055#include <termios.h>
Damien Miller1cdde6f2006-07-24 14:07:35 +100056#include <unistd.h>
Damien Millerd7834352006-08-05 12:39:39 +100057#include <stdarg.h>
Damien Miller69b69aa2000-10-28 14:19:58 +110058
Damien Millerb84886b2008-05-19 15:05:07 +100059#include "openbsd-compat/sys-queue.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100060#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100061#include "packet.h"
62#include "buffer.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000063#include "log.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100064#include "servconf.h"
Damien Miller16aed052002-09-22 01:26:27 +100065#include "canohost.h"
Ben Lindstromd95c09c2001-02-18 19:13:33 +000066#include "sshpty.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000067#include "channels.h"
Damien Millerb38eff82000-04-01 11:09:21 +100068#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000069#include "ssh1.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100070#include "ssh2.h"
Damien Millerd7834352006-08-05 12:39:39 +100071#include "key.h"
72#include "cipher.h"
73#include "kex.h"
74#include "hostfile.h"
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000075#include "auth.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100076#include "session.h"
Damien Millerb38eff82000-04-01 11:09:21 +100077#include "dispatch.h"
Damien Millerf6d9e222000-06-18 14:50:44 +100078#include "auth-options.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000079#include "serverloop.h"
80#include "misc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081
Damien Miller50a41ed2000-10-16 12:14:42 +110082extern ServerOptions options;
83
Ben Lindstrom8ac91062001-04-04 17:57:54 +000084/* XXX */
85extern Kex *xxx_kex;
Darren Tucker3e33cec2003-10-02 16:12:36 +100086extern Authctxt *the_authctxt;
Damien Miller24ecf612005-11-05 15:16:52 +110087extern int use_privsep;
Ben Lindstrom8ac91062001-04-04 17:57:54 +000088
Damien Millerd4a8b7e1999-10-27 13:42:43 +100089static Buffer stdin_buffer; /* Buffer for stdin data. */
90static Buffer stdout_buffer; /* Buffer for stdout data. */
91static Buffer stderr_buffer; /* Buffer for stderr data. */
92static int fdin; /* Descriptor for stdin (for writing) */
93static int fdout; /* Descriptor for stdout (for reading);
94 May be same number as fdin. */
95static int fderr; /* Descriptor for stderr. May be -1. */
96static long stdin_bytes = 0; /* Number of bytes written to stdin. */
97static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */
98static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */
99static long fdout_bytes = 0; /* Number of stdout bytes read from program. */
100static int stdin_eof = 0; /* EOF message received from client. */
101static int fdout_eof = 0; /* EOF encountered reading from fdout. */
102static int fderr_eof = 0; /* EOF encountered readung from fderr. */
Damien Miller225736c2001-02-19 21:51:08 +1100103static int fdin_is_tty = 0; /* fdin points to a tty. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000104static int connection_in; /* Connection to client (input). */
105static int connection_out; /* Connection to client (output). */
Ben Lindstrome34ab4c2001-04-07 01:12:11 +0000106static int connection_closed = 0; /* Connection to client closed. */
107static u_int buffer_high; /* "Soft" max buffer size. */
Darren Tucker8901fa92008-06-11 09:34:01 +1000108static int no_more_sessions = 0; /* Disallow further sessions. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000109
Damien Miller5428f641999-11-25 11:54:57 +1100110/*
111 * This SIGCHLD kludge is used to detect when the child exits. The server
112 * will exit after that, as soon as forwarded connections have terminated.
113 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000114
Ben Lindstrom5e71c542001-12-06 16:48:14 +0000115static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000116
Damien Miller24ecf612005-11-05 15:16:52 +1100117/* Cleanup on signals (!use_privsep case only) */
118static volatile sig_atomic_t received_sigterm = 0;
119
Ben Lindstrombba81212001-06-25 05:01:22 +0000120/* prototypes */
121static void server_init_dispatch(void);
Damien Millerb38eff82000-04-01 11:09:21 +1000122
Damien Millerf6681a32001-12-21 14:53:11 +1100123/*
124 * we write to this pipe if a SIGCHLD is caught in order to avoid
125 * the race between select() and child_terminated
126 */
127static int notify_pipe[2];
128static void
129notify_setup(void)
130{
131 if (pipe(notify_pipe) < 0) {
132 error("pipe(notify_pipe) failed %s", strerror(errno));
133 } else if ((fcntl(notify_pipe[0], F_SETFD, 1) == -1) ||
134 (fcntl(notify_pipe[1], F_SETFD, 1) == -1)) {
135 error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno));
136 close(notify_pipe[0]);
137 close(notify_pipe[1]);
138 } else {
139 set_nonblock(notify_pipe[0]);
140 set_nonblock(notify_pipe[1]);
141 return;
142 }
143 notify_pipe[0] = -1; /* read end */
144 notify_pipe[1] = -1; /* write end */
145}
146static void
147notify_parent(void)
148{
149 if (notify_pipe[1] != -1)
150 write(notify_pipe[1], "", 1);
151}
152static void
153notify_prepare(fd_set *readset)
154{
155 if (notify_pipe[0] != -1)
156 FD_SET(notify_pipe[0], readset);
157}
158static void
159notify_done(fd_set *readset)
160{
161 char c;
162
163 if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset))
164 while (read(notify_pipe[0], &c, 1) != -1)
165 debug2("notify_done: reading");
166}
167
Damien Millerf0b15df2006-03-26 13:59:20 +1100168/*ARGSUSED*/
Ben Lindstrombba81212001-06-25 05:01:22 +0000169static void
Damien Miller95def091999-11-25 00:26:21 +1100170sigchld_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000171{
Damien Miller95def091999-11-25 00:26:21 +1100172 int save_errno = errno;
Damien Millerefb4afe2000-04-12 18:45:05 +1000173 child_terminated = 1;
Tim Rice81ed5182002-09-25 17:38:46 -0700174#ifndef _UNICOS
Ben Lindstromec46e0b2001-06-09 01:27:31 +0000175 mysignal(SIGCHLD, sigchld_handler);
Tim Rice81ed5182002-09-25 17:38:46 -0700176#endif
Damien Millerf6681a32001-12-21 14:53:11 +1100177 notify_parent();
Damien Millerefb4afe2000-04-12 18:45:05 +1000178 errno = save_errno;
179}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000180
Damien Millerf0b15df2006-03-26 13:59:20 +1100181/*ARGSUSED*/
Damien Miller24ecf612005-11-05 15:16:52 +1100182static void
183sigterm_handler(int sig)
184{
185 received_sigterm = sig;
186}
187
Damien Miller95def091999-11-25 00:26:21 +1100188/*
Damien Miller95def091999-11-25 00:26:21 +1100189 * Make packets from buffered stderr data, and buffer it for sending
190 * to the client.
191 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000192static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000193make_packets_from_stderr_data(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000194{
Darren Tucker502d3842003-06-28 12:38:01 +1000195 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000196
Damien Miller95def091999-11-25 00:26:21 +1100197 /* Send buffered stderr data to the client. */
198 while (buffer_len(&stderr_buffer) > 0 &&
Damien Miller037a0dc1999-12-07 15:38:31 +1100199 packet_not_very_much_data_to_write()) {
Damien Miller95def091999-11-25 00:26:21 +1100200 len = buffer_len(&stderr_buffer);
201 if (packet_is_interactive()) {
202 if (len > 512)
203 len = 512;
204 } else {
205 /* Keep the packets at reasonable size. */
206 if (len > packet_get_maxsize())
207 len = packet_get_maxsize();
208 }
209 packet_start(SSH_SMSG_STDERR_DATA);
210 packet_put_string(buffer_ptr(&stderr_buffer), len);
211 packet_send();
212 buffer_consume(&stderr_buffer, len);
213 stderr_bytes += len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000214 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000215}
216
Damien Miller95def091999-11-25 00:26:21 +1100217/*
218 * Make packets from buffered stdout data, and buffer it for sending to the
219 * client.
220 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000221static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000222make_packets_from_stdout_data(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000223{
Darren Tucker502d3842003-06-28 12:38:01 +1000224 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000225
Damien Miller95def091999-11-25 00:26:21 +1100226 /* Send buffered stdout data to the client. */
227 while (buffer_len(&stdout_buffer) > 0 &&
Damien Miller037a0dc1999-12-07 15:38:31 +1100228 packet_not_very_much_data_to_write()) {
Damien Miller95def091999-11-25 00:26:21 +1100229 len = buffer_len(&stdout_buffer);
230 if (packet_is_interactive()) {
231 if (len > 512)
232 len = 512;
233 } else {
234 /* Keep the packets at reasonable size. */
235 if (len > packet_get_maxsize())
Kevin Stevesef4eea92001-02-05 12:42:17 +0000236 len = packet_get_maxsize();
Damien Miller95def091999-11-25 00:26:21 +1100237 }
238 packet_start(SSH_SMSG_STDOUT_DATA);
239 packet_put_string(buffer_ptr(&stdout_buffer), len);
240 packet_send();
241 buffer_consume(&stdout_buffer, len);
242 stdout_bytes += len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000243 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000244}
245
Damien Miller8c3902a2001-10-10 15:01:40 +1000246static void
247client_alive_check(void)
248{
Damien Millerb5820f42003-12-17 16:27:32 +1100249 int channel_id;
Damien Miller056cf732002-01-22 23:21:39 +1100250
Damien Miller8c3902a2001-10-10 15:01:40 +1000251 /* timeout, check to see how many we have had */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000252 if (packet_inc_alive_timeouts() > options.client_alive_count_max) {
Damien Miller985a4482006-10-24 03:02:41 +1000253 logit("Timeout, client not responding.");
254 cleanup_exit(255);
255 }
Damien Miller8c3902a2001-10-10 15:01:40 +1000256
Damien Miller8c3902a2001-10-10 15:01:40 +1000257 /*
Damien Millerb5820f42003-12-17 16:27:32 +1100258 * send a bogus global/channel request with "wantreply",
Damien Miller8c3902a2001-10-10 15:01:40 +1000259 * we should get back a failure
260 */
Damien Millerb5820f42003-12-17 16:27:32 +1100261 if ((channel_id = channel_find_open()) == -1) {
262 packet_start(SSH2_MSG_GLOBAL_REQUEST);
263 packet_put_cstring("keepalive@openssh.com");
264 packet_put_char(1); /* boolean: want reply */
265 } else {
266 channel_request_start(channel_id, "keepalive@openssh.com", 1);
267 }
Damien Miller8c3902a2001-10-10 15:01:40 +1000268 packet_send();
269}
270
Damien Miller95def091999-11-25 00:26:21 +1100271/*
272 * Sleep in select() until we can do something. This will initialize the
273 * select masks. Upon return, the masks will indicate which descriptors
274 * have data or can accept data. Optionally, a maximum time can be specified
275 * for the duration of the wait (0 = infinite).
276 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000277static void
Damien Miller5e953212001-01-30 09:14:00 +1100278wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000279 u_int *nallocp, u_int max_time_milliseconds)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000280{
Damien Miller95def091999-11-25 00:26:21 +1100281 struct timeval tv, *tvp;
282 int ret;
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000283 int client_alive_scheduled = 0;
Damien Millere42bd242007-01-29 10:16:28 +1100284 int program_alive_scheduled = 0;
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000285
286 /*
Damien Miller9f0f5c62001-12-21 14:45:46 +1100287 * if using client_alive, set the max timeout accordingly,
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000288 * and indicate that this particular timeout was for client
289 * alive by setting the client_alive_scheduled flag.
290 *
291 * this could be randomized somewhat to make traffic
Damien Miller9f0f5c62001-12-21 14:45:46 +1100292 * analysis more difficult, but we're not doing it yet.
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000293 */
Ben Lindstrom36857f62001-07-18 15:48:57 +0000294 if (compat20 &&
295 max_time_milliseconds == 0 && options.client_alive_interval) {
Ben Lindstrom2f0304c2001-04-29 19:49:14 +0000296 client_alive_scheduled = 1;
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000297 max_time_milliseconds = options.client_alive_interval * 1000;
Ben Lindstrom36857f62001-07-18 15:48:57 +0000298 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000299
Damien Miller5e953212001-01-30 09:14:00 +1100300 /* Allocate and update select() masks for channel descriptors. */
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000301 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000302
Damien Millerefb4afe2000-04-12 18:45:05 +1000303 if (compat20) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000304#if 0
Damien Millere247cc42000-05-07 12:03:14 +1000305 /* wrong: bad condition XXX */
Damien Millerefb4afe2000-04-12 18:45:05 +1000306 if (channel_not_very_much_buffered_data())
Damien Milleraf5f2e62001-10-10 15:01:16 +1000307#endif
308 FD_SET(connection_in, *readsetp);
Damien Millerefb4afe2000-04-12 18:45:05 +1000309 } else {
Damien Millerb1715dc2000-05-30 13:44:51 +1000310 /*
311 * Read packets from the client unless we have too much
312 * buffered stdin or channel data.
313 */
314 if (buffer_len(&stdin_buffer) < buffer_high &&
Damien Millerefb4afe2000-04-12 18:45:05 +1000315 channel_not_very_much_buffered_data())
Damien Miller5e953212001-01-30 09:14:00 +1100316 FD_SET(connection_in, *readsetp);
Damien Millerb1715dc2000-05-30 13:44:51 +1000317 /*
318 * If there is not too much data already buffered going to
319 * the client, try to get some more data from the program.
320 */
321 if (packet_not_very_much_data_to_write()) {
Damien Millere42bd242007-01-29 10:16:28 +1100322 program_alive_scheduled = child_terminated;
Damien Millerb1715dc2000-05-30 13:44:51 +1000323 if (!fdout_eof)
Damien Miller5e953212001-01-30 09:14:00 +1100324 FD_SET(fdout, *readsetp);
Damien Millerb1715dc2000-05-30 13:44:51 +1000325 if (!fderr_eof)
Damien Miller5e953212001-01-30 09:14:00 +1100326 FD_SET(fderr, *readsetp);
Damien Millerb1715dc2000-05-30 13:44:51 +1000327 }
328 /*
329 * If we have buffered data, try to write some of that data
330 * to the program.
331 */
332 if (fdin != -1 && buffer_len(&stdin_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100333 FD_SET(fdin, *writesetp);
Damien Millerefb4afe2000-04-12 18:45:05 +1000334 }
Damien Millerf6681a32001-12-21 14:53:11 +1100335 notify_prepare(*readsetp);
Damien Miller95def091999-11-25 00:26:21 +1100336
Damien Miller5428f641999-11-25 11:54:57 +1100337 /*
338 * If we have buffered packet data going to the client, mark that
339 * descriptor.
340 */
Damien Miller95def091999-11-25 00:26:21 +1100341 if (packet_have_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100342 FD_SET(connection_out, *writesetp);
Damien Miller95def091999-11-25 00:26:21 +1100343
Damien Miller5428f641999-11-25 11:54:57 +1100344 /*
345 * If child has terminated and there is enough buffer space to read
346 * from it, then read as much as is available and exit.
347 */
Damien Miller95def091999-11-25 00:26:21 +1100348 if (child_terminated && packet_not_very_much_data_to_write())
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000349 if (max_time_milliseconds == 0 || client_alive_scheduled)
Damien Miller95def091999-11-25 00:26:21 +1100350 max_time_milliseconds = 100;
351
352 if (max_time_milliseconds == 0)
353 tvp = NULL;
354 else {
355 tv.tv_sec = max_time_milliseconds / 1000;
356 tv.tv_usec = 1000 * (max_time_milliseconds % 1000);
357 tvp = &tv;
358 }
359
360 /* Wait for something to happen, or the timeout to expire. */
Damien Miller5e953212001-01-30 09:14:00 +1100361 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
Damien Miller95def091999-11-25 00:26:21 +1100362
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000363 if (ret == -1) {
Damien Miller79faeff2001-11-12 11:06:32 +1100364 memset(*readsetp, 0, *nallocp);
365 memset(*writesetp, 0, *nallocp);
Damien Miller95def091999-11-25 00:26:21 +1100366 if (errno != EINTR)
367 error("select: %.100s", strerror(errno));
Damien Millere42bd242007-01-29 10:16:28 +1100368 } else {
369 if (ret == 0 && client_alive_scheduled)
370 client_alive_check();
371 if (!compat20 && program_alive_scheduled && fdin_is_tty) {
372 if (!fdout_eof)
373 FD_SET(fdout, *readsetp);
374 if (!fderr_eof)
375 FD_SET(fderr, *readsetp);
376 }
377 }
Damien Millerf6681a32001-12-21 14:53:11 +1100378
379 notify_done(*readsetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000380}
381
Damien Miller95def091999-11-25 00:26:21 +1100382/*
383 * Processes input from the client and the program. Input data is stored
384 * in buffers and processed later.
385 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000386static void
Damien Miller90fdfaf2006-03-26 14:25:37 +1100387process_input(fd_set *readset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000388{
Damien Miller95def091999-11-25 00:26:21 +1100389 int len;
390 char buf[16384];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000391
Damien Miller95def091999-11-25 00:26:21 +1100392 /* Read and buffer any input data from the client. */
393 if (FD_ISSET(connection_in, readset)) {
394 len = read(connection_in, buf, sizeof(buf));
395 if (len == 0) {
Damien Miller16aed052002-09-22 01:26:27 +1000396 verbose("Connection closed by %.100s",
397 get_remote_ipaddr());
Ben Lindstrome34ab4c2001-04-07 01:12:11 +0000398 connection_closed = 1;
399 if (compat20)
400 return;
Darren Tucker3e33cec2003-10-02 16:12:36 +1000401 cleanup_exit(255);
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000402 } else if (len < 0) {
Damien Millerd8968ad2008-07-04 23:10:49 +1000403 if (errno != EINTR && errno != EAGAIN &&
404 errno != EWOULDBLOCK) {
Damien Miller16aed052002-09-22 01:26:27 +1000405 verbose("Read error from remote host "
406 "%.100s: %.100s",
407 get_remote_ipaddr(), strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +1000408 cleanup_exit(255);
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000409 }
410 } else {
411 /* Buffer any received data. */
412 packet_process_incoming(buf, len);
Damien Miller95def091999-11-25 00:26:21 +1100413 }
Damien Miller95def091999-11-25 00:26:21 +1100414 }
Damien Millerefb4afe2000-04-12 18:45:05 +1000415 if (compat20)
416 return;
417
Damien Miller95def091999-11-25 00:26:21 +1100418 /* Read and buffer any available stdout data from the program. */
419 if (!fdout_eof && FD_ISSET(fdout, readset)) {
Darren Tucker9afe1152006-06-23 21:24:12 +1000420 errno = 0;
Damien Miller95def091999-11-25 00:26:21 +1100421 len = read(fdout, buf, sizeof(buf));
Damien Millerd8968ad2008-07-04 23:10:49 +1000422 if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
423 errno == EWOULDBLOCK) && !child_terminated))) {
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000424 /* do nothing */
Darren Tucker03890e42006-06-24 16:58:45 +1000425#ifndef PTY_ZEROREAD
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000426 } else if (len <= 0) {
Darren Tucker9afe1152006-06-23 21:24:12 +1000427#else
Darren Tucker144e8d62006-06-25 08:25:25 +1000428 } else if ((!isatty(fdout) && len <= 0) ||
429 (isatty(fdout) && (len < 0 || (len == 0 && errno != 0)))) {
Darren Tucker9afe1152006-06-23 21:24:12 +1000430#endif
Damien Miller95def091999-11-25 00:26:21 +1100431 fdout_eof = 1;
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000432 } else {
Damien Miller95def091999-11-25 00:26:21 +1100433 buffer_append(&stdout_buffer, buf, len);
434 fdout_bytes += len;
435 }
436 }
437 /* Read and buffer any available stderr data from the program. */
438 if (!fderr_eof && FD_ISSET(fderr, readset)) {
Darren Tucker9afe1152006-06-23 21:24:12 +1000439 errno = 0;
Damien Miller95def091999-11-25 00:26:21 +1100440 len = read(fderr, buf, sizeof(buf));
Damien Millerd8968ad2008-07-04 23:10:49 +1000441 if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
442 errno == EWOULDBLOCK) && !child_terminated))) {
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000443 /* do nothing */
Darren Tucker03890e42006-06-24 16:58:45 +1000444#ifndef PTY_ZEROREAD
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000445 } else if (len <= 0) {
Darren Tucker9afe1152006-06-23 21:24:12 +1000446#else
Darren Tucker144e8d62006-06-25 08:25:25 +1000447 } else if ((!isatty(fderr) && len <= 0) ||
448 (isatty(fderr) && (len < 0 || (len == 0 && errno != 0)))) {
Darren Tucker9afe1152006-06-23 21:24:12 +1000449#endif
Damien Miller95def091999-11-25 00:26:21 +1100450 fderr_eof = 1;
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000451 } else {
Damien Miller95def091999-11-25 00:26:21 +1100452 buffer_append(&stderr_buffer, buf, len);
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000453 }
Damien Miller95def091999-11-25 00:26:21 +1100454 }
455}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000456
Damien Miller95def091999-11-25 00:26:21 +1100457/*
458 * Sends data from internal buffers to client program stdin.
459 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000460static void
Damien Miller90fdfaf2006-03-26 14:25:37 +1100461process_output(fd_set *writeset)
Damien Miller95def091999-11-25 00:26:21 +1100462{
Ben Lindstromaa630de2001-02-10 23:44:47 +0000463 struct termios tio;
Ben Lindstrom6d218f42001-09-18 05:53:12 +0000464 u_char *data;
465 u_int dlen;
Damien Miller95def091999-11-25 00:26:21 +1100466 int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000467
Damien Miller95def091999-11-25 00:26:21 +1100468 /* Write buffered data to program stdin. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000469 if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) {
Ben Lindstrom6d218f42001-09-18 05:53:12 +0000470 data = buffer_ptr(&stdin_buffer);
471 dlen = buffer_len(&stdin_buffer);
472 len = write(fdin, data, dlen);
Damien Millerd8968ad2008-07-04 23:10:49 +1000473 if (len < 0 &&
474 (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) {
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000475 /* do nothing */
476 } else if (len <= 0) {
Damien Millerb38eff82000-04-01 11:09:21 +1000477 if (fdin != fdout)
Damien Miller95def091999-11-25 00:26:21 +1100478 close(fdin);
479 else
480 shutdown(fdin, SHUT_WR); /* We will no longer send. */
Damien Miller95def091999-11-25 00:26:21 +1100481 fdin = -1;
482 } else {
Ben Lindstromaa630de2001-02-10 23:44:47 +0000483 /* Successful write. */
Ben Lindstrom6d218f42001-09-18 05:53:12 +0000484 if (fdin_is_tty && dlen >= 1 && data[0] != '\r' &&
485 tcgetattr(fdin, &tio) == 0 &&
Damien Miller79438cc2001-02-16 12:34:57 +1100486 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
Kevin Stevesb7f036f2001-02-15 17:27:15 +0000487 /*
488 * Simulate echo to reduce the impact of
489 * traffic analysis
490 */
Ben Lindstrome229b252001-03-05 06:28:06 +0000491 packet_send_ignore(len);
Ben Lindstromaa630de2001-02-10 23:44:47 +0000492 packet_send();
493 }
494 /* Consume the data from the buffer. */
Damien Miller95def091999-11-25 00:26:21 +1100495 buffer_consume(&stdin_buffer, len);
496 /* Update the count of bytes written to the program. */
497 stdin_bytes += len;
498 }
499 }
500 /* Send any buffered packet data to the client. */
501 if (FD_ISSET(connection_out, writeset))
502 packet_write_poll();
503}
504
505/*
506 * Wait until all buffered output has been sent to the client.
507 * This is used when the program terminates.
508 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000509static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000510drain_output(void)
Damien Miller95def091999-11-25 00:26:21 +1100511{
512 /* Send any buffered stdout data to the client. */
513 if (buffer_len(&stdout_buffer) > 0) {
514 packet_start(SSH_SMSG_STDOUT_DATA);
515 packet_put_string(buffer_ptr(&stdout_buffer),
516 buffer_len(&stdout_buffer));
517 packet_send();
518 /* Update the count of sent bytes. */
519 stdout_bytes += buffer_len(&stdout_buffer);
520 }
521 /* Send any buffered stderr data to the client. */
522 if (buffer_len(&stderr_buffer) > 0) {
523 packet_start(SSH_SMSG_STDERR_DATA);
524 packet_put_string(buffer_ptr(&stderr_buffer),
525 buffer_len(&stderr_buffer));
526 packet_send();
527 /* Update the count of sent bytes. */
528 stderr_bytes += buffer_len(&stderr_buffer);
529 }
530 /* Wait until all buffered data has been written to the client. */
531 packet_write_wait();
532}
533
Ben Lindstrombba81212001-06-25 05:01:22 +0000534static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000535process_buffered_input_packets(void)
Damien Millerb38eff82000-04-01 11:09:21 +1000536{
Ben Lindstrom8ac91062001-04-04 17:57:54 +0000537 dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000538}
539
Damien Miller95def091999-11-25 00:26:21 +1100540/*
541 * Performs the interactive session. This handles data transmission between
542 * the client and the program. Note that the notion of stdin, stdout, and
543 * stderr in this function is sort of reversed: this function writes to
544 * stdin (of the child program), and reads from stdout and stderr (of the
545 * child program).
546 */
Damien Miller4af51302000-04-16 11:18:38 +1000547void
Damien Miller166fca82000-04-20 07:42:21 +1000548server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
Damien Miller95def091999-11-25 00:26:21 +1100549{
Damien Miller5e953212001-01-30 09:14:00 +1100550 fd_set *readset = NULL, *writeset = NULL;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000551 int max_fd = 0;
552 u_int nalloc = 0;
Damien Miller166fca82000-04-20 07:42:21 +1000553 int wait_status; /* Status returned by wait(). */
554 pid_t wait_pid; /* pid returned by wait(). */
Damien Miller95def091999-11-25 00:26:21 +1100555 int waiting_termination = 0; /* Have displayed waiting close message. */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000556 u_int max_time_milliseconds;
557 u_int previous_stdout_buffer_bytes;
558 u_int stdout_buffer_bytes;
Damien Miller95def091999-11-25 00:26:21 +1100559 int type;
560
561 debug("Entering interactive session.");
562
563 /* Initialize the SIGCHLD kludge. */
Damien Miller95def091999-11-25 00:26:21 +1100564 child_terminated = 0;
Kevin Stevese26a1552001-07-26 17:51:49 +0000565 mysignal(SIGCHLD, sigchld_handler);
Damien Miller95def091999-11-25 00:26:21 +1100566
Damien Miller24ecf612005-11-05 15:16:52 +1100567 if (!use_privsep) {
568 signal(SIGTERM, sigterm_handler);
569 signal(SIGINT, sigterm_handler);
570 signal(SIGQUIT, sigterm_handler);
571 }
572
Damien Miller95def091999-11-25 00:26:21 +1100573 /* Initialize our global variables. */
574 fdin = fdin_arg;
575 fdout = fdout_arg;
576 fderr = fderr_arg;
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000577
578 /* nonblocking IO */
579 set_nonblock(fdin);
580 set_nonblock(fdout);
Damien Miller7d6656c2000-05-20 15:22:36 +1000581 /* we don't have stderr for interactive terminal sessions, see below */
582 if (fderr != -1)
583 set_nonblock(fderr);
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000584
Damien Miller225736c2001-02-19 21:51:08 +1100585 if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin))
586 fdin_is_tty = 1;
587
Damien Miller95def091999-11-25 00:26:21 +1100588 connection_in = packet_get_connection_in();
589 connection_out = packet_get_connection_out();
590
Damien Millerf6681a32001-12-21 14:53:11 +1100591 notify_setup();
592
Damien Miller95def091999-11-25 00:26:21 +1100593 previous_stdout_buffer_bytes = 0;
594
595 /* Set approximate I/O buffer size. */
596 if (packet_is_interactive())
597 buffer_high = 4096;
598 else
599 buffer_high = 64 * 1024;
600
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000601#if 0
Damien Miller95def091999-11-25 00:26:21 +1100602 /* Initialize max_fd to the maximum of the known file descriptors. */
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000603 max_fd = MAX(connection_in, connection_out);
604 max_fd = MAX(max_fd, fdin);
605 max_fd = MAX(max_fd, fdout);
Damien Miller5e953212001-01-30 09:14:00 +1100606 if (fderr != -1)
607 max_fd = MAX(max_fd, fderr);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000608#endif
Damien Miller95def091999-11-25 00:26:21 +1100609
610 /* Initialize Initialize buffers. */
611 buffer_init(&stdin_buffer);
612 buffer_init(&stdout_buffer);
613 buffer_init(&stderr_buffer);
614
Damien Miller5428f641999-11-25 11:54:57 +1100615 /*
616 * If we have no separate fderr (which is the case when we have a pty
617 * - there we cannot make difference between data sent to stdout and
618 * stderr), indicate that we have seen an EOF from stderr. This way
Damien Miller788f2122005-11-05 15:14:59 +1100619 * we don't need to check the descriptor everywhere.
Damien Miller5428f641999-11-25 11:54:57 +1100620 */
Damien Miller95def091999-11-25 00:26:21 +1100621 if (fderr == -1)
622 fderr_eof = 1;
623
Damien Millerb38eff82000-04-01 11:09:21 +1000624 server_init_dispatch();
625
Damien Miller95def091999-11-25 00:26:21 +1100626 /* Main loop of the server for the interactive session mode. */
627 for (;;) {
Damien Miller95def091999-11-25 00:26:21 +1100628
629 /* Process buffered packets from the client. */
630 process_buffered_input_packets();
631
Damien Miller5428f641999-11-25 11:54:57 +1100632 /*
633 * If we have received eof, and there is no more pending
634 * input data, cause a real eof by closing fdin.
635 */
Damien Miller95def091999-11-25 00:26:21 +1100636 if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) {
Damien Millerb38eff82000-04-01 11:09:21 +1000637 if (fdin != fdout)
Damien Miller95def091999-11-25 00:26:21 +1100638 close(fdin);
639 else
640 shutdown(fdin, SHUT_WR); /* We will no longer send. */
Damien Miller95def091999-11-25 00:26:21 +1100641 fdin = -1;
642 }
Damien Miller5428f641999-11-25 11:54:57 +1100643 /* Make packets from buffered stderr data to send to the client. */
Damien Miller95def091999-11-25 00:26:21 +1100644 make_packets_from_stderr_data();
645
Damien Miller5428f641999-11-25 11:54:57 +1100646 /*
647 * Make packets from buffered stdout data to send to the
648 * client. If there is very little to send, this arranges to
649 * not send them now, but to wait a short while to see if we
650 * are getting more data. This is necessary, as some systems
651 * wake up readers from a pty after each separate character.
652 */
Damien Miller95def091999-11-25 00:26:21 +1100653 max_time_milliseconds = 0;
654 stdout_buffer_bytes = buffer_len(&stdout_buffer);
655 if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 &&
656 stdout_buffer_bytes != previous_stdout_buffer_bytes) {
657 /* try again after a while */
658 max_time_milliseconds = 10;
659 } else {
660 /* Send it now. */
661 make_packets_from_stdout_data();
662 }
663 previous_stdout_buffer_bytes = buffer_len(&stdout_buffer);
664
665 /* Send channel data to the client. */
666 if (packet_not_very_much_data_to_write())
667 channel_output_poll();
668
Damien Miller5428f641999-11-25 11:54:57 +1100669 /*
670 * Bail out of the loop if the program has closed its output
671 * descriptors, and we have no more data to send to the
672 * client, and there is no pending buffered data.
673 */
Damien Miller43dc8da2000-11-29 15:55:17 +1100674 if (fdout_eof && fderr_eof && !packet_have_data_to_write() &&
675 buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) {
Damien Miller95def091999-11-25 00:26:21 +1100676 if (!channel_still_open())
Damien Millerb38eff82000-04-01 11:09:21 +1000677 break;
Damien Miller95def091999-11-25 00:26:21 +1100678 if (!waiting_termination) {
679 const char *s = "Waiting for forwarded connections to terminate...\r\n";
680 char *cp;
681 waiting_termination = 1;
682 buffer_append(&stderr_buffer, s, strlen(s));
683
684 /* Display list of open channels. */
685 cp = channel_open_message();
686 buffer_append(&stderr_buffer, cp, strlen(cp));
687 xfree(cp);
688 }
689 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000690 max_fd = MAX(connection_in, connection_out);
691 max_fd = MAX(max_fd, fdin);
692 max_fd = MAX(max_fd, fdout);
693 max_fd = MAX(max_fd, fderr);
Damien Millerf6681a32001-12-21 14:53:11 +1100694 max_fd = MAX(max_fd, notify_pipe[0]);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000695
Damien Miller95def091999-11-25 00:26:21 +1100696 /* Sleep in select() until we can do something. */
Damien Miller5e953212001-01-30 09:14:00 +1100697 wait_until_can_do_something(&readset, &writeset, &max_fd,
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000698 &nalloc, max_time_milliseconds);
Damien Miller95def091999-11-25 00:26:21 +1100699
Damien Miller24ecf612005-11-05 15:16:52 +1100700 if (received_sigterm) {
701 logit("Exiting on signal %d", received_sigterm);
702 /* Clean up sessions, utmp, etc. */
703 cleanup_exit(255);
704 }
705
Damien Miller95def091999-11-25 00:26:21 +1100706 /* Process any channel events. */
Damien Miller5e953212001-01-30 09:14:00 +1100707 channel_after_select(readset, writeset);
Damien Miller95def091999-11-25 00:26:21 +1100708
709 /* Process input from the client and from program stdout/stderr. */
Damien Miller5e953212001-01-30 09:14:00 +1100710 process_input(readset);
Damien Miller95def091999-11-25 00:26:21 +1100711
712 /* Process output to the client and to program stdin. */
Damien Miller5e953212001-01-30 09:14:00 +1100713 process_output(writeset);
Damien Miller95def091999-11-25 00:26:21 +1100714 }
Damien Miller5e953212001-01-30 09:14:00 +1100715 if (readset)
716 xfree(readset);
717 if (writeset)
718 xfree(writeset);
Damien Miller95def091999-11-25 00:26:21 +1100719
Damien Miller95def091999-11-25 00:26:21 +1100720 /* Cleanup and termination code. */
721
722 /* Wait until all output has been sent to the client. */
723 drain_output();
724
725 debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100726 stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes);
Damien Miller95def091999-11-25 00:26:21 +1100727
728 /* Free and clear the buffers. */
729 buffer_free(&stdin_buffer);
730 buffer_free(&stdout_buffer);
731 buffer_free(&stderr_buffer);
732
733 /* Close the file descriptors. */
734 if (fdout != -1)
735 close(fdout);
736 fdout = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000737 fdout_eof = 1;
Damien Miller95def091999-11-25 00:26:21 +1100738 if (fderr != -1)
739 close(fderr);
740 fderr = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000741 fderr_eof = 1;
Damien Miller95def091999-11-25 00:26:21 +1100742 if (fdin != -1)
743 close(fdin);
744 fdin = -1;
745
Ben Lindstrom601e4362001-06-21 03:19:23 +0000746 channel_free_all();
Damien Miller95def091999-11-25 00:26:21 +1100747
Damien Miller95def091999-11-25 00:26:21 +1100748 /* We no longer want our SIGCHLD handler to be called. */
Kevin Stevese26a1552001-07-26 17:51:49 +0000749 mysignal(SIGCHLD, SIG_DFL);
Damien Miller95def091999-11-25 00:26:21 +1100750
Ben Lindstrom47fd8112002-04-02 20:48:19 +0000751 while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0)
752 if (errno != EINTR)
753 packet_disconnect("wait: %.100s", strerror(errno));
754 if (wait_pid != pid)
Ben Lindstromce0f6342002-06-11 16:42:49 +0000755 error("Strange, wait returned pid %ld, expected %ld",
756 (long)wait_pid, (long)pid);
Ben Lindstromec46e0b2001-06-09 01:27:31 +0000757
Damien Miller95def091999-11-25 00:26:21 +1100758 /* Check if it exited normally. */
759 if (WIFEXITED(wait_status)) {
760 /* Yes, normal exit. Get exit status and send it to the client. */
761 debug("Command exited with status %d.", WEXITSTATUS(wait_status));
762 packet_start(SSH_SMSG_EXITSTATUS);
763 packet_put_int(WEXITSTATUS(wait_status));
764 packet_send();
765 packet_write_wait();
766
Damien Miller5428f641999-11-25 11:54:57 +1100767 /*
768 * Wait for exit confirmation. Note that there might be
769 * other packets coming before it; however, the program has
770 * already died so we just ignore them. The client is
771 * supposed to respond with the confirmation when it receives
772 * the exit status.
773 */
Damien Miller95def091999-11-25 00:26:21 +1100774 do {
Damien Millerdff50992002-01-22 23:16:32 +1100775 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +1100776 }
777 while (type != SSH_CMSG_EXIT_CONFIRMATION);
778
779 debug("Received exit confirmation.");
780 return;
781 }
782 /* Check if the program terminated due to a signal. */
783 if (WIFSIGNALED(wait_status))
784 packet_disconnect("Command terminated on signal %d.",
785 WTERMSIG(wait_status));
786
787 /* Some weird exit cause. Just exit. */
788 packet_disconnect("wait returned status %04x.", wait_status);
789 /* NOTREACHED */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000790}
Damien Millerb38eff82000-04-01 11:09:21 +1000791
Damien Miller3ec27592001-10-12 11:35:04 +1000792static void
793collect_children(void)
794{
795 pid_t pid;
796 sigset_t oset, nset;
797 int status;
798
799 /* block SIGCHLD while we check for dead children */
800 sigemptyset(&nset);
801 sigaddset(&nset, SIGCHLD);
802 sigprocmask(SIG_BLOCK, &nset, &oset);
803 if (child_terminated) {
Damien Millerec04f362006-03-15 12:01:34 +1100804 debug("Received SIGCHLD.");
Ben Lindstrom47fd8112002-04-02 20:48:19 +0000805 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
806 (pid < 0 && errno == EINTR))
807 if (pid > 0)
808 session_close_by_pid(pid, status);
Damien Miller3ec27592001-10-12 11:35:04 +1000809 child_terminated = 0;
810 }
811 sigprocmask(SIG_SETMASK, &oset, NULL);
812}
813
Damien Miller4af51302000-04-16 11:18:38 +1000814void
Ben Lindstrombddd5512001-07-04 04:53:53 +0000815server_loop2(Authctxt *authctxt)
Damien Millerefb4afe2000-04-12 18:45:05 +1000816{
Damien Miller5e953212001-01-30 09:14:00 +1100817 fd_set *readset = NULL, *writeset = NULL;
Damien Miller3ec27592001-10-12 11:35:04 +1000818 int rekeying = 0, max_fd, nalloc = 0;
Damien Millerefb4afe2000-04-12 18:45:05 +1000819
820 debug("Entering interactive session for SSH2.");
821
Ben Lindstromec46e0b2001-06-09 01:27:31 +0000822 mysignal(SIGCHLD, sigchld_handler);
Damien Millerefb4afe2000-04-12 18:45:05 +1000823 child_terminated = 0;
824 connection_in = packet_get_connection_in();
825 connection_out = packet_get_connection_out();
Damien Miller5e953212001-01-30 09:14:00 +1100826
Damien Miller24ecf612005-11-05 15:16:52 +1100827 if (!use_privsep) {
828 signal(SIGTERM, sigterm_handler);
829 signal(SIGINT, sigterm_handler);
830 signal(SIGQUIT, sigterm_handler);
831 }
832
Damien Millerf6681a32001-12-21 14:53:11 +1100833 notify_setup();
834
Damien Miller5e953212001-01-30 09:14:00 +1100835 max_fd = MAX(connection_in, connection_out);
Damien Millerf6681a32001-12-21 14:53:11 +1100836 max_fd = MAX(max_fd, notify_pipe[0]);
837
Damien Millerefb4afe2000-04-12 18:45:05 +1000838 server_init_dispatch();
839
840 for (;;) {
841 process_buffered_input_packets();
Ben Lindstrom8e312f32001-04-04 23:50:21 +0000842
Ben Lindstroma3700052001-04-05 23:26:32 +0000843 rekeying = (xxx_kex != NULL && !xxx_kex->done);
Ben Lindstrom8e312f32001-04-04 23:50:21 +0000844
Ben Lindstrom8e312f32001-04-04 23:50:21 +0000845 if (!rekeying && packet_not_very_much_data_to_write())
Damien Millerefb4afe2000-04-12 18:45:05 +1000846 channel_output_poll();
Ben Lindstrom8e312f32001-04-04 23:50:21 +0000847 wait_until_can_do_something(&readset, &writeset, &max_fd,
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000848 &nalloc, 0);
Damien Miller52b77be2001-10-10 15:14:37 +1000849
Damien Miller24ecf612005-11-05 15:16:52 +1100850 if (received_sigterm) {
851 logit("Exiting on signal %d", received_sigterm);
852 /* Clean up sessions, utmp, etc. */
853 cleanup_exit(255);
854 }
855
Damien Miller3ec27592001-10-12 11:35:04 +1000856 collect_children();
Damien Millera5539d22003-04-09 20:50:06 +1000857 if (!rekeying) {
Ben Lindstrom8e312f32001-04-04 23:50:21 +0000858 channel_after_select(readset, writeset);
Damien Millera5539d22003-04-09 20:50:06 +1000859 if (packet_need_rekeying()) {
860 debug("need rekeying");
861 xxx_kex->done = 0;
862 kex_send_kexinit(xxx_kex);
863 }
864 }
Damien Miller5e953212001-01-30 09:14:00 +1100865 process_input(readset);
Ben Lindstrome34ab4c2001-04-07 01:12:11 +0000866 if (connection_closed)
867 break;
Damien Miller5e953212001-01-30 09:14:00 +1100868 process_output(writeset);
Damien Millerefb4afe2000-04-12 18:45:05 +1000869 }
Damien Miller3ec27592001-10-12 11:35:04 +1000870 collect_children();
871
Damien Miller5e953212001-01-30 09:14:00 +1100872 if (readset)
873 xfree(readset);
874 if (writeset)
875 xfree(writeset);
876
Damien Miller52b77be2001-10-10 15:14:37 +1000877 /* free all channels, no more reads and writes */
878 channel_free_all();
Ben Lindstrom4983d5e2001-07-04 05:17:40 +0000879
Damien Miller3ec27592001-10-12 11:35:04 +1000880 /* free remaining sessions, e.g. remove wtmp entries */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000881 session_destroy_all(NULL);
Damien Millerefb4afe2000-04-12 18:45:05 +1000882}
883
Ben Lindstrombba81212001-06-25 05:01:22 +0000884static void
Damien Millerb5820f42003-12-17 16:27:32 +1100885server_input_keep_alive(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000886{
Damien Millerb5820f42003-12-17 16:27:32 +1100887 debug("Got %d/%u for keepalive", type, seq);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100888 /*
Ben Lindstrom2f0304c2001-04-29 19:49:14 +0000889 * reset timeout, since we got a sane answer from the client.
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000890 * even if this was generated by something other than
891 * the bogus CHANNEL_REQUEST we send for keepalives.
892 */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000893 packet_set_alive_timeouts(0);
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000894}
895
Ben Lindstrombba81212001-06-25 05:01:22 +0000896static void
Damien Miller630d6f42002-01-22 23:17:30 +1100897server_input_stdin_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000898{
899 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000900 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000901
902 /* Stdin data from the client. Append it to the buffer. */
903 /* Ignore any data if the client has closed stdin. */
904 if (fdin == -1)
905 return;
906 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +1100907 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +1000908 buffer_append(&stdin_buffer, data, data_len);
909 memset(data, 0, data_len);
910 xfree(data);
911}
912
Ben Lindstrombba81212001-06-25 05:01:22 +0000913static void
Damien Miller630d6f42002-01-22 23:17:30 +1100914server_input_eof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000915{
916 /*
917 * Eof from the client. The stdin descriptor to the
918 * program will be closed when all buffered data has
919 * drained.
920 */
921 debug("EOF received for stdin.");
Damien Miller48b03fc2002-01-22 23:11:40 +1100922 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +1000923 stdin_eof = 1;
924}
925
Ben Lindstrombba81212001-06-25 05:01:22 +0000926static void
Damien Miller630d6f42002-01-22 23:17:30 +1100927server_input_window_size(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000928{
Damien Miller71a73672006-03-26 14:04:36 +1100929 u_int row = packet_get_int();
930 u_int col = packet_get_int();
931 u_int xpixel = packet_get_int();
932 u_int ypixel = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +1000933
934 debug("Window change received.");
Damien Miller48b03fc2002-01-22 23:11:40 +1100935 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +1000936 if (fdin != -1)
937 pty_change_window_size(fdin, row, col, xpixel, ypixel);
938}
939
Ben Lindstrombba81212001-06-25 05:01:22 +0000940static Channel *
Damien Millerfb1310e2004-01-21 11:02:50 +1100941server_request_direct_tcpip(void)
Damien Millerefb4afe2000-04-12 18:45:05 +1000942{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000943 Channel *c;
Damien Miller4af51302000-04-16 11:18:38 +1000944 char *target, *originator;
Damien Miller3dc71ad2009-01-28 16:31:22 +1100945 u_short target_port, originator_port;
Damien Millerefb4afe2000-04-12 18:45:05 +1000946
Damien Miller4af51302000-04-16 11:18:38 +1000947 target = packet_get_string(NULL);
948 target_port = packet_get_int();
Damien Millerefb4afe2000-04-12 18:45:05 +1000949 originator = packet_get_string(NULL);
950 originator_port = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +1100951 packet_check_eom();
Damien Millerb1715dc2000-05-30 13:44:51 +1000952
Damien Millerbd740252008-05-19 15:37:09 +1000953 debug("server_request_direct_tcpip: originator %s port %d, target %s "
954 "port %d", originator, originator_port, target, target_port);
Damien Millerf6d9e222000-06-18 14:50:44 +1000955
Damien Millerefb4afe2000-04-12 18:45:05 +1000956 /* XXX check permission */
Damien Millerbd740252008-05-19 15:37:09 +1000957 c = channel_connect_to(target, target_port,
958 "direct-tcpip", "direct-tcpip");
959
Damien Millerefb4afe2000-04-12 18:45:05 +1000960 xfree(originator);
Damien Millerbd740252008-05-19 15:37:09 +1000961 xfree(target);
962
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000963 return c;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100964}
965
Ben Lindstrombba81212001-06-25 05:01:22 +0000966static Channel *
Damien Millerd27b9472005-12-13 19:29:02 +1100967server_request_tun(void)
968{
969 Channel *c = NULL;
Damien Miller7b58e802005-12-13 19:33:19 +1100970 int mode, tun;
971 int sock;
Damien Millerd27b9472005-12-13 19:29:02 +1100972
Damien Miller7b58e802005-12-13 19:33:19 +1100973 mode = packet_get_int();
974 switch (mode) {
975 case SSH_TUNMODE_POINTOPOINT:
976 case SSH_TUNMODE_ETHERNET:
977 break;
978 default:
979 packet_send_debug("Unsupported tunnel device mode.");
980 return NULL;
981 }
982 if ((options.permit_tun & mode) == 0) {
983 packet_send_debug("Server has rejected tunnel device "
984 "forwarding");
Damien Millerd27b9472005-12-13 19:29:02 +1100985 return NULL;
986 }
987
988 tun = packet_get_int();
Darren Tucker0d0e8f02005-12-20 16:08:42 +1100989 if (forced_tun_device != -1) {
Damien Millerf0b15df2006-03-26 13:59:20 +1100990 if (tun != SSH_TUNID_ANY && forced_tun_device != tun)
Damien Millerd27b9472005-12-13 19:29:02 +1100991 goto done;
992 tun = forced_tun_device;
993 }
Damien Miller7b58e802005-12-13 19:33:19 +1100994 sock = tun_open(tun, mode);
Damien Millerd27b9472005-12-13 19:29:02 +1100995 if (sock < 0)
996 goto done;
997 c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1,
998 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
999 c->datagram = 1;
Damien Miller598bbc22005-12-31 16:33:36 +11001000#if defined(SSH_TUN_FILTER)
1001 if (mode == SSH_TUNMODE_POINTOPOINT)
1002 channel_register_filter(c->self, sys_tun_infilter,
Darren Tucker1cf65ae2008-06-13 05:09:18 +10001003 sys_tun_outfilter, NULL, NULL);
Damien Miller598bbc22005-12-31 16:33:36 +11001004#endif
Damien Millerd27b9472005-12-13 19:29:02 +11001005
1006 done:
1007 if (c == NULL)
1008 packet_send_debug("Failed to open the tunnel device.");
1009 return c;
1010}
1011
1012static Channel *
Damien Millerfb1310e2004-01-21 11:02:50 +11001013server_request_session(void)
Damien Miller0bc1bd82000-11-13 22:57:25 +11001014{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001015 Channel *c;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001016
1017 debug("input_session_request");
Damien Miller48b03fc2002-01-22 23:11:40 +11001018 packet_check_eom();
Darren Tucker8901fa92008-06-11 09:34:01 +10001019
1020 if (no_more_sessions) {
1021 packet_disconnect("Possible attack: attempt to open a session "
1022 "after additional sessions disabled");
1023 }
1024
Damien Miller0bc1bd82000-11-13 22:57:25 +11001025 /*
1026 * A server session has no fd to read or write until a
1027 * CHANNEL_REQUEST for a shell is made, so we set the type to
1028 * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all
1029 * CHANNEL_REQUEST messages is registered.
1030 */
Damien Millerfb1310e2004-01-21 11:02:50 +11001031 c = channel_new("session", SSH_CHANNEL_LARVAL,
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001032 -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001033 0, "server-session", 1);
Darren Tucker3e33cec2003-10-02 16:12:36 +10001034 if (session_open(the_authctxt, c->self) != 1) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001035 debug("session open failed, free channel %d", c->self);
1036 channel_free(c);
1037 return NULL;
1038 }
Damien Miller39eda6e2005-11-05 14:52:50 +11001039 channel_register_cleanup(c->self, session_close_by_channel, 0);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001040 return c;
Damien Millerefb4afe2000-04-12 18:45:05 +10001041}
1042
Ben Lindstrombba81212001-06-25 05:01:22 +00001043static void
Damien Miller630d6f42002-01-22 23:17:30 +11001044server_input_channel_open(int type, u_int32_t seq, void *ctxt)
Damien Millerefb4afe2000-04-12 18:45:05 +10001045{
1046 Channel *c = NULL;
1047 char *ctype;
Damien Millerefb4afe2000-04-12 18:45:05 +10001048 int rchan;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001049 u_int rmaxpack, rwindow, len;
Damien Millerefb4afe2000-04-12 18:45:05 +10001050
1051 ctype = packet_get_string(&len);
1052 rchan = packet_get_int();
1053 rwindow = packet_get_int();
1054 rmaxpack = packet_get_int();
1055
Damien Miller62cee002000-09-23 17:15:56 +11001056 debug("server_input_channel_open: ctype %s rchan %d win %d max %d",
Damien Millerefb4afe2000-04-12 18:45:05 +10001057 ctype, rchan, rwindow, rmaxpack);
1058
1059 if (strcmp(ctype, "session") == 0) {
Damien Millerfb1310e2004-01-21 11:02:50 +11001060 c = server_request_session();
Damien Millerefb4afe2000-04-12 18:45:05 +10001061 } else if (strcmp(ctype, "direct-tcpip") == 0) {
Damien Millerfb1310e2004-01-21 11:02:50 +11001062 c = server_request_direct_tcpip();
Damien Millerd27b9472005-12-13 19:29:02 +11001063 } else if (strcmp(ctype, "tun@openssh.com") == 0) {
1064 c = server_request_tun();
Damien Millerefb4afe2000-04-12 18:45:05 +10001065 }
1066 if (c != NULL) {
Damien Miller0bc1bd82000-11-13 22:57:25 +11001067 debug("server_input_channel_open: confirm %s", ctype);
Damien Millerefb4afe2000-04-12 18:45:05 +10001068 c->remote_id = rchan;
1069 c->remote_window = rwindow;
1070 c->remote_maxpacket = rmaxpack;
Ben Lindstrom69128662001-05-08 20:07:39 +00001071 if (c->type != SSH_CHANNEL_CONNECTING) {
1072 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1073 packet_put_int(c->remote_id);
1074 packet_put_int(c->self);
1075 packet_put_int(c->local_window);
1076 packet_put_int(c->local_maxpacket);
1077 packet_send();
1078 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001079 } else {
Damien Miller0bc1bd82000-11-13 22:57:25 +11001080 debug("server_input_channel_open: failure %s", ctype);
Damien Millerefb4afe2000-04-12 18:45:05 +10001081 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1082 packet_put_int(rchan);
1083 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
Ben Lindstromf3436742001-04-29 19:52:00 +00001084 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001085 packet_put_cstring("open failed");
Ben Lindstromf3436742001-04-29 19:52:00 +00001086 packet_put_cstring("");
1087 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001088 packet_send();
1089 }
1090 xfree(ctype);
1091}
1092
Ben Lindstrombba81212001-06-25 05:01:22 +00001093static void
Damien Miller630d6f42002-01-22 23:17:30 +11001094server_input_global_request(int type, u_int32_t seq, void *ctxt)
Damien Miller0bc1bd82000-11-13 22:57:25 +11001095{
1096 char *rtype;
1097 int want_reply;
Damien Miller4bf648f2009-02-14 16:28:21 +11001098 int success = 0, allocated_listen_port = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001099
1100 rtype = packet_get_string(NULL);
1101 want_reply = packet_get_char();
1102 debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply);
Kevin Stevesef4eea92001-02-05 12:42:17 +00001103
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00001104 /* -R style forwarding */
Damien Miller0bc1bd82000-11-13 22:57:25 +11001105 if (strcmp(rtype, "tcpip-forward") == 0) {
1106 struct passwd *pw;
1107 char *listen_address;
1108 u_short listen_port;
1109
Darren Tucker3e33cec2003-10-02 16:12:36 +10001110 pw = the_authctxt->pw;
Damien Miller4bb1dd32003-11-18 22:01:25 +11001111 if (pw == NULL || !the_authctxt->valid)
Damien Miller3e3b5142003-11-17 21:13:40 +11001112 fatal("server_input_global_request: no/invalid user");
Damien Miller9fc7c692003-06-04 22:50:54 +10001113 listen_address = packet_get_string(NULL);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001114 listen_port = (u_short)packet_get_int();
1115 debug("server_input_global_request: tcpip-forward listen %s port %d",
1116 listen_address, listen_port);
1117
1118 /* check permissions */
1119 if (!options.allow_tcp_forwarding ||
Damien Miller330d5852009-02-14 16:33:09 +11001120 no_port_forwarding_flag ||
1121 (!want_reply && listen_port == 0)
Ben Lindstrom99a4e142002-07-09 14:06:40 +00001122#ifndef NO_IPPORT_RESERVED_CONCEPT
Damien Miller330d5852009-02-14 16:33:09 +11001123 || (listen_port < IPPORT_RESERVED && pw->pw_uid != 0)
Ben Lindstrom99a4e142002-07-09 14:06:40 +00001124#endif
Damien Millerb6f72f52005-07-17 17:26:43 +10001125 ) {
Damien Miller0bc1bd82000-11-13 22:57:25 +11001126 success = 0;
1127 packet_send_debug("Server has disabled port forwarding.");
1128 } else {
1129 /* Start listening on the port */
Damien Millerb16461c2002-01-22 23:29:22 +11001130 success = channel_setup_remote_fwd_listener(
Damien Miller330d5852009-02-14 16:33:09 +11001131 listen_address, listen_port,
1132 &allocated_listen_port, options.gateway_ports);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001133 }
1134 xfree(listen_address);
Darren Tuckere7066df2004-05-24 10:18:05 +10001135 } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) {
1136 char *cancel_address;
1137 u_short cancel_port;
1138
1139 cancel_address = packet_get_string(NULL);
1140 cancel_port = (u_short)packet_get_int();
1141 debug("%s: cancel-tcpip-forward addr %s port %d", __func__,
1142 cancel_address, cancel_port);
1143
1144 success = channel_cancel_rport_listener(cancel_address,
1145 cancel_port);
Damien Miller6f98a1f2006-03-26 13:51:08 +11001146 xfree(cancel_address);
Darren Tucker8901fa92008-06-11 09:34:01 +10001147 } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) {
1148 no_more_sessions = 1;
1149 success = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001150 }
1151 if (want_reply) {
1152 packet_start(success ?
1153 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
Damien Miller4bf648f2009-02-14 16:28:21 +11001154 if (success && allocated_listen_port > 0)
1155 packet_put_int(allocated_listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001156 packet_send();
1157 packet_write_wait();
1158 }
1159 xfree(rtype);
1160}
Damien Miller4f7becb2006-03-26 14:10:14 +11001161
Damien Millerc7ef63d2002-02-05 12:21:42 +11001162static void
1163server_input_channel_req(int type, u_int32_t seq, void *ctxt)
1164{
1165 Channel *c;
1166 int id, reply, success = 0;
1167 char *rtype;
1168
1169 id = packet_get_int();
1170 rtype = packet_get_string(NULL);
1171 reply = packet_get_char();
1172
1173 debug("server_input_channel_req: channel %d request %s reply %d",
1174 id, rtype, reply);
1175
1176 if ((c = channel_lookup(id)) == NULL)
1177 packet_disconnect("server_input_channel_req: "
1178 "unknown channel %d", id);
Damien Millerbab9bd42008-05-19 16:06:47 +10001179 if (!strcmp(rtype, "eow@openssh.com")) {
1180 packet_check_eom();
1181 chan_rcvd_eow(c);
Darren Tucker8810dd42008-07-02 22:32:14 +10001182 } else if ((c->type == SSH_CHANNEL_LARVAL ||
1183 c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0)
Damien Millerc7ef63d2002-02-05 12:21:42 +11001184 success = session_input_channel_req(c, rtype);
1185 if (reply) {
1186 packet_start(success ?
1187 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1188 packet_put_int(c->remote_id);
1189 packet_send();
1190 }
1191 xfree(rtype);
1192}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001193
Ben Lindstrombba81212001-06-25 05:01:22 +00001194static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001195server_init_dispatch_20(void)
Damien Millerefb4afe2000-04-12 18:45:05 +10001196{
1197 debug("server_init_dispatch_20");
1198 dispatch_init(&dispatch_protocol_error);
1199 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1200 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1201 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1202 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1203 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open);
1204 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1205 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
Damien Millerc7ef63d2002-02-05 12:21:42 +11001206 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req);
Damien Millerefb4afe2000-04-12 18:45:05 +10001207 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001208 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00001209 /* client_alive */
Damien Miller5a33ec62008-12-08 09:55:02 +11001210 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive);
1211 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive);
Damien Millerb5820f42003-12-17 16:27:32 +11001212 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive);
1213 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive);
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001214 /* rekeying */
1215 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
Damien Millerefb4afe2000-04-12 18:45:05 +10001216}
Ben Lindstrombba81212001-06-25 05:01:22 +00001217static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001218server_init_dispatch_13(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001219{
1220 debug("server_init_dispatch_13");
1221 dispatch_init(NULL);
1222 dispatch_set(SSH_CMSG_EOF, &server_input_eof);
1223 dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data);
1224 dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size);
1225 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1226 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1227 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1228 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1229 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1230 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1231}
Ben Lindstrombba81212001-06-25 05:01:22 +00001232static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001233server_init_dispatch_15(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001234{
1235 server_init_dispatch_13();
1236 debug("server_init_dispatch_15");
1237 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1238 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose);
1239}
Ben Lindstrombba81212001-06-25 05:01:22 +00001240static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001241server_init_dispatch(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001242{
Damien Millerefb4afe2000-04-12 18:45:05 +10001243 if (compat20)
1244 server_init_dispatch_20();
1245 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001246 server_init_dispatch_13();
1247 else
1248 server_init_dispatch_15();
1249}