1 /* $OpenBSD: serverloop.c,v 1.189 2016/12/14 00:36:34 djm Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * Server main loop for handling the interactive session.
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".
14 * SSH2 support by Markus Friedl.
15 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
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.
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.
40 #include <sys/types.h>
42 #include <sys/socket.h>
43 #ifdef HAVE_SYS_TIME_H
44 # include <sys/time.h>
47 #include <netinet/in.h>
58 #include "openbsd-compat/sys-queue.h"
77 #include "auth-options.h"
78 #include "serverloop.h"
81 extern ServerOptions options;
84 extern Authctxt *the_authctxt;
85 extern int use_privsep;
87 static int no_more_sessions = 0; /* Disallow further sessions. */
90 * This SIGCHLD kludge is used to detect when the child exits. The server
91 * will exit after that, as soon as forwarded connections have terminated.
94 static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */
96 /* Cleanup on signals (!use_privsep case only) */
97 static volatile sig_atomic_t received_sigterm = 0;
100 static void server_init_dispatch(void);
103 * we write to this pipe if a SIGCHLD is caught in order to avoid
104 * the race between select() and child_terminated
106 static int notify_pipe[2];
110 if (pipe(notify_pipe) < 0) {
111 error("pipe(notify_pipe) failed %s", strerror(errno));
112 } else if ((fcntl(notify_pipe[0], F_SETFD, FD_CLOEXEC) == -1) ||
113 (fcntl(notify_pipe[1], F_SETFD, FD_CLOEXEC) == -1)) {
114 error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno));
115 close(notify_pipe[0]);
116 close(notify_pipe[1]);
118 set_nonblock(notify_pipe[0]);
119 set_nonblock(notify_pipe[1]);
122 notify_pipe[0] = -1; /* read end */
123 notify_pipe[1] = -1; /* write end */
128 if (notify_pipe[1] != -1)
129 (void)write(notify_pipe[1], "", 1);
132 notify_prepare(fd_set *readset)
134 if (notify_pipe[0] != -1)
135 FD_SET(notify_pipe[0], readset);
138 notify_done(fd_set *readset)
142 if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset))
143 while (read(notify_pipe[0], &c, 1) != -1)
144 debug2("notify_done: reading");
149 sigchld_handler(int sig)
151 int save_errno = errno;
152 child_terminated = 1;
154 mysignal(SIGCHLD, sigchld_handler);
162 sigterm_handler(int sig)
164 received_sigterm = sig;
168 client_alive_check(void)
172 /* timeout, check to see how many we have had */
173 if (packet_inc_alive_timeouts() > options.client_alive_count_max) {
174 logit("Timeout, client not responding.");
179 * send a bogus global/channel request with "wantreply",
180 * we should get back a failure
182 if ((channel_id = channel_find_open()) == -1) {
183 packet_start(SSH2_MSG_GLOBAL_REQUEST);
184 packet_put_cstring("keepalive@openssh.com");
185 packet_put_char(1); /* boolean: want reply */
187 channel_request_start(channel_id, "keepalive@openssh.com", 1);
193 * Sleep in select() until we can do something. This will initialize the
194 * select masks. Upon return, the masks will indicate which descriptors
195 * have data or can accept data. Optionally, a maximum time can be specified
196 * for the duration of the wait (0 = infinite).
199 wait_until_can_do_something(int connection_in, int connection_out,
200 fd_set **readsetp, fd_set **writesetp, int *maxfdp,
201 u_int *nallocp, u_int64_t max_time_ms)
203 struct timeval tv, *tvp;
205 time_t minwait_secs = 0;
206 int client_alive_scheduled = 0;
208 /* Allocate and update select() masks for channel descriptors. */
209 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
212 /* XXX need proper deadline system for rekey/client alive */
213 if (minwait_secs != 0)
214 max_time_ms = MINIMUM(max_time_ms, (u_int)minwait_secs * 1000);
217 * if using client_alive, set the max timeout accordingly,
218 * and indicate that this particular timeout was for client
219 * alive by setting the client_alive_scheduled flag.
221 * this could be randomized somewhat to make traffic
222 * analysis more difficult, but we're not doing it yet.
224 if (options.client_alive_interval) {
225 uint64_t keepalive_ms =
226 (uint64_t)options.client_alive_interval * 1000;
228 client_alive_scheduled = 1;
229 if (max_time_ms == 0 || max_time_ms > keepalive_ms)
230 max_time_ms = keepalive_ms;
234 /* wrong: bad condition XXX */
235 if (channel_not_very_much_buffered_data())
237 FD_SET(connection_in, *readsetp);
238 notify_prepare(*readsetp);
241 * If we have buffered packet data going to the client, mark that
244 if (packet_have_data_to_write())
245 FD_SET(connection_out, *writesetp);
248 * If child has terminated and there is enough buffer space to read
249 * from it, then read as much as is available and exit.
251 if (child_terminated && packet_not_very_much_data_to_write())
252 if (max_time_ms == 0 || client_alive_scheduled)
255 if (max_time_ms == 0)
258 tv.tv_sec = max_time_ms / 1000;
259 tv.tv_usec = 1000 * (max_time_ms % 1000);
263 /* Wait for something to happen, or the timeout to expire. */
264 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
267 memset(*readsetp, 0, *nallocp);
268 memset(*writesetp, 0, *nallocp);
270 error("select: %.100s", strerror(errno));
271 } else if (ret == 0 && client_alive_scheduled)
272 client_alive_check();
274 notify_done(*readsetp);
278 * Processes input from the client and the program. Input data is stored
279 * in buffers and processed later.
282 process_input(fd_set *readset, int connection_in)
284 struct ssh *ssh = active_state; /* XXX */
288 /* Read and buffer any input data from the client. */
289 if (FD_ISSET(connection_in, readset)) {
290 len = read(connection_in, buf, sizeof(buf));
292 verbose("Connection closed by %.100s port %d",
293 ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
295 } else if (len < 0) {
296 if (errno != EINTR && errno != EAGAIN &&
297 errno != EWOULDBLOCK) {
298 verbose("Read error from remote host "
299 "%.100s port %d: %.100s",
300 ssh_remote_ipaddr(ssh),
301 ssh_remote_port(ssh), strerror(errno));
305 /* Buffer any received data. */
306 packet_process_incoming(buf, len);
313 * Sends data from internal buffers to client program stdin.
316 process_output(fd_set *writeset, int connection_out)
318 /* Send any buffered packet data to the client. */
319 if (FD_ISSET(connection_out, writeset))
324 process_buffered_input_packets(void)
326 dispatch_run(DISPATCH_NONBLOCK, NULL, active_state);
330 collect_children(void)
336 /* block SIGCHLD while we check for dead children */
338 sigaddset(&nset, SIGCHLD);
339 sigprocmask(SIG_BLOCK, &nset, &oset);
340 if (child_terminated) {
341 debug("Received SIGCHLD.");
342 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
343 (pid < 0 && errno == EINTR))
345 session_close_by_pid(pid, status);
346 child_terminated = 0;
348 sigprocmask(SIG_SETMASK, &oset, NULL);
352 server_loop2(Authctxt *authctxt)
354 fd_set *readset = NULL, *writeset = NULL;
356 u_int nalloc = 0, connection_in, connection_out;
357 u_int64_t rekey_timeout_ms = 0;
359 debug("Entering interactive session for SSH2.");
361 mysignal(SIGCHLD, sigchld_handler);
362 child_terminated = 0;
363 connection_in = packet_get_connection_in();
364 connection_out = packet_get_connection_out();
367 signal(SIGTERM, sigterm_handler);
368 signal(SIGINT, sigterm_handler);
369 signal(SIGQUIT, sigterm_handler);
374 max_fd = MAXIMUM(connection_in, connection_out);
375 max_fd = MAXIMUM(max_fd, notify_pipe[0]);
377 server_init_dispatch();
380 process_buffered_input_packets();
382 if (!ssh_packet_is_rekeying(active_state) &&
383 packet_not_very_much_data_to_write())
384 channel_output_poll();
385 if (options.rekey_interval > 0 &&
386 !ssh_packet_is_rekeying(active_state))
387 rekey_timeout_ms = packet_get_rekey_timeout() * 1000;
389 rekey_timeout_ms = 0;
391 wait_until_can_do_something(connection_in, connection_out,
392 &readset, &writeset, &max_fd, &nalloc, rekey_timeout_ms);
394 if (received_sigterm) {
395 logit("Exiting on signal %d", (int)received_sigterm);
396 /* Clean up sessions, utmp, etc. */
401 if (!ssh_packet_is_rekeying(active_state))
402 channel_after_select(readset, writeset);
403 if (process_input(readset, connection_in) < 0)
405 process_output(writeset, connection_out);
412 /* free all channels, no more reads and writes */
415 /* free remaining sessions, e.g. remove wtmp entries */
416 session_destroy_all(NULL);
420 server_input_keep_alive(int type, u_int32_t seq, void *ctxt)
422 debug("Got %d/%u for keepalive", type, seq);
424 * reset timeout, since we got a sane answer from the client.
425 * even if this was generated by something other than
426 * the bogus CHANNEL_REQUEST we send for keepalives.
428 packet_set_alive_timeouts(0);
433 server_request_direct_tcpip(void)
436 char *target, *originator;
437 u_short target_port, originator_port;
439 target = packet_get_string(NULL);
440 target_port = packet_get_int();
441 originator = packet_get_string(NULL);
442 originator_port = packet_get_int();
445 debug("server_request_direct_tcpip: originator %s port %d, target %s "
446 "port %d", originator, originator_port, target, target_port);
448 /* XXX fine grained permissions */
449 if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0 &&
450 !no_port_forwarding_flag && !options.disable_forwarding) {
451 c = channel_connect_to_port(target, target_port,
452 "direct-tcpip", "direct-tcpip");
454 logit("refused local port forward: "
455 "originator %s port %d, target %s port %d",
456 originator, originator_port, target, target_port);
466 server_request_direct_streamlocal(void)
469 char *target, *originator;
470 u_short originator_port;
472 target = packet_get_string(NULL);
473 originator = packet_get_string(NULL);
474 originator_port = packet_get_int();
477 debug("server_request_direct_streamlocal: originator %s port %d, target %s",
478 originator, originator_port, target);
480 /* XXX fine grained permissions */
481 if ((options.allow_streamlocal_forwarding & FORWARD_LOCAL) != 0 &&
482 !no_port_forwarding_flag && !options.disable_forwarding &&
484 c = channel_connect_to_path(target,
485 "direct-streamlocal@openssh.com", "direct-streamlocal");
487 logit("refused streamlocal port forward: "
488 "originator %s port %d, target %s",
489 originator, originator_port, target);
499 server_request_tun(void)
505 mode = packet_get_int();
507 case SSH_TUNMODE_POINTOPOINT:
508 case SSH_TUNMODE_ETHERNET:
511 packet_send_debug("Unsupported tunnel device mode.");
514 if ((options.permit_tun & mode) == 0) {
515 packet_send_debug("Server has rejected tunnel device "
520 tun = packet_get_int();
521 if (forced_tun_device != -1) {
522 if (tun != SSH_TUNID_ANY && forced_tun_device != tun)
524 tun = forced_tun_device;
526 sock = tun_open(tun, mode);
529 c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1,
530 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
532 #if defined(SSH_TUN_FILTER)
533 if (mode == SSH_TUNMODE_POINTOPOINT)
534 channel_register_filter(c->self, sys_tun_infilter,
535 sys_tun_outfilter, NULL, NULL);
540 packet_send_debug("Failed to open the tunnel device.");
545 server_request_session(void)
549 debug("input_session_request");
552 if (no_more_sessions) {
553 packet_disconnect("Possible attack: attempt to open a session "
554 "after additional sessions disabled");
558 * A server session has no fd to read or write until a
559 * CHANNEL_REQUEST for a shell is made, so we set the type to
560 * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all
561 * CHANNEL_REQUEST messages is registered.
563 c = channel_new("session", SSH_CHANNEL_LARVAL,
564 -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT,
565 0, "server-session", 1);
566 if (session_open(the_authctxt, c->self) != 1) {
567 debug("session open failed, free channel %d", c->self);
571 channel_register_cleanup(c->self, session_close_by_channel, 0);
576 server_input_channel_open(int type, u_int32_t seq, void *ctxt)
581 u_int rmaxpack, rwindow, len;
583 ctype = packet_get_string(&len);
584 rchan = packet_get_int();
585 rwindow = packet_get_int();
586 rmaxpack = packet_get_int();
588 debug("server_input_channel_open: ctype %s rchan %d win %d max %d",
589 ctype, rchan, rwindow, rmaxpack);
591 if (strcmp(ctype, "session") == 0) {
592 c = server_request_session();
593 } else if (strcmp(ctype, "direct-tcpip") == 0) {
594 c = server_request_direct_tcpip();
595 } else if (strcmp(ctype, "direct-streamlocal@openssh.com") == 0) {
596 c = server_request_direct_streamlocal();
597 } else if (strcmp(ctype, "tun@openssh.com") == 0) {
598 c = server_request_tun();
601 debug("server_input_channel_open: confirm %s", ctype);
602 c->remote_id = rchan;
603 c->remote_window = rwindow;
604 c->remote_maxpacket = rmaxpack;
605 if (c->type != SSH_CHANNEL_CONNECTING) {
606 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
607 packet_put_int(c->remote_id);
608 packet_put_int(c->self);
609 packet_put_int(c->local_window);
610 packet_put_int(c->local_maxpacket);
614 debug("server_input_channel_open: failure %s", ctype);
615 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
616 packet_put_int(rchan);
617 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
618 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
619 packet_put_cstring("open failed");
620 packet_put_cstring("");
629 server_input_hostkeys_prove(struct sshbuf **respp)
631 struct ssh *ssh = active_state; /* XXX */
632 struct sshbuf *resp = NULL;
633 struct sshbuf *sigbuf = NULL;
634 struct sshkey *key = NULL, *key_pub = NULL, *key_prv = NULL;
635 int r, ndx, success = 0;
640 if ((resp = sshbuf_new()) == NULL || (sigbuf = sshbuf_new()) == NULL)
641 fatal("%s: sshbuf_new", __func__);
643 while (ssh_packet_remaining(ssh) > 0) {
646 if ((r = sshpkt_get_string_direct(ssh, &blob, &blen)) != 0 ||
647 (r = sshkey_from_blob(blob, blen, &key)) != 0) {
648 error("%s: couldn't parse key: %s",
649 __func__, ssh_err(r));
653 * Better check that this is actually one of our hostkeys
654 * before attempting to sign anything with it.
656 if ((ndx = ssh->kex->host_key_index(key, 1, ssh)) == -1) {
657 error("%s: unknown host %s key",
658 __func__, sshkey_type(key));
662 * XXX refactor: make kex->sign just use an index rather
663 * than passing in public and private keys
665 if ((key_prv = get_hostkey_by_index(ndx)) == NULL &&
666 (key_pub = get_hostkey_public_by_index(ndx, ssh)) == NULL) {
667 error("%s: can't retrieve hostkey %d", __func__, ndx);
670 sshbuf_reset(sigbuf);
673 if ((r = sshbuf_put_cstring(sigbuf,
674 "hostkeys-prove-00@openssh.com")) != 0 ||
675 (r = sshbuf_put_string(sigbuf,
676 ssh->kex->session_id, ssh->kex->session_id_len)) != 0 ||
677 (r = sshkey_puts(key, sigbuf)) != 0 ||
678 (r = ssh->kex->sign(key_prv, key_pub, &sig, &slen,
679 sshbuf_ptr(sigbuf), sshbuf_len(sigbuf), NULL, 0)) != 0 ||
680 (r = sshbuf_put_string(resp, sig, slen)) != 0) {
681 error("%s: couldn't prepare signature: %s",
682 __func__, ssh_err(r));
688 resp = NULL; /* don't free it */
699 server_input_global_request(int type, u_int32_t seq, void *ctxt)
703 int r, success = 0, allocated_listen_port = 0;
704 struct sshbuf *resp = NULL;
706 rtype = packet_get_string(NULL);
707 want_reply = packet_get_char();
708 debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply);
710 /* -R style forwarding */
711 if (strcmp(rtype, "tcpip-forward") == 0) {
715 pw = the_authctxt->pw;
716 if (pw == NULL || !the_authctxt->valid)
717 fatal("server_input_global_request: no/invalid user");
718 memset(&fwd, 0, sizeof(fwd));
719 fwd.listen_host = packet_get_string(NULL);
720 fwd.listen_port = (u_short)packet_get_int();
721 debug("server_input_global_request: tcpip-forward listen %s port %d",
722 fwd.listen_host, fwd.listen_port);
724 /* check permissions */
725 if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0 ||
726 no_port_forwarding_flag || options.disable_forwarding ||
727 (!want_reply && fwd.listen_port == 0) ||
728 (fwd.listen_port != 0 &&
729 !bind_permitted(fwd.listen_port, pw->pw_uid))) {
731 packet_send_debug("Server has disabled port forwarding.");
733 /* Start listening on the port */
734 success = channel_setup_remote_fwd_listener(&fwd,
735 &allocated_listen_port, &options.fwd_opts);
737 free(fwd.listen_host);
738 if ((resp = sshbuf_new()) == NULL)
739 fatal("%s: sshbuf_new", __func__);
740 if (allocated_listen_port != 0 &&
741 (r = sshbuf_put_u32(resp, allocated_listen_port)) != 0)
742 fatal("%s: sshbuf_put_u32: %s", __func__, ssh_err(r));
743 } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) {
746 memset(&fwd, 0, sizeof(fwd));
747 fwd.listen_host = packet_get_string(NULL);
748 fwd.listen_port = (u_short)packet_get_int();
749 debug("%s: cancel-tcpip-forward addr %s port %d", __func__,
750 fwd.listen_host, fwd.listen_port);
752 success = channel_cancel_rport_listener(&fwd);
753 free(fwd.listen_host);
754 } else if (strcmp(rtype, "streamlocal-forward@openssh.com") == 0) {
757 memset(&fwd, 0, sizeof(fwd));
758 fwd.listen_path = packet_get_string(NULL);
759 debug("server_input_global_request: streamlocal-forward listen path %s",
762 /* check permissions */
763 if ((options.allow_streamlocal_forwarding & FORWARD_REMOTE) == 0
764 || no_port_forwarding_flag || options.disable_forwarding ||
767 packet_send_debug("Server has disabled port forwarding.");
769 /* Start listening on the socket */
770 success = channel_setup_remote_fwd_listener(
771 &fwd, NULL, &options.fwd_opts);
773 free(fwd.listen_path);
774 } else if (strcmp(rtype, "cancel-streamlocal-forward@openssh.com") == 0) {
777 memset(&fwd, 0, sizeof(fwd));
778 fwd.listen_path = packet_get_string(NULL);
779 debug("%s: cancel-streamlocal-forward path %s", __func__,
782 success = channel_cancel_rport_listener(&fwd);
783 free(fwd.listen_path);
784 } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) {
785 no_more_sessions = 1;
787 } else if (strcmp(rtype, "hostkeys-prove-00@openssh.com") == 0) {
788 success = server_input_hostkeys_prove(&resp);
791 packet_start(success ?
792 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
793 if (success && resp != NULL)
794 ssh_packet_put_raw(active_state, sshbuf_ptr(resp),
805 server_input_channel_req(int type, u_int32_t seq, void *ctxt)
808 int id, reply, success = 0;
811 id = packet_get_int();
812 rtype = packet_get_string(NULL);
813 reply = packet_get_char();
815 debug("server_input_channel_req: channel %d request %s reply %d",
818 if ((c = channel_lookup(id)) == NULL)
819 packet_disconnect("server_input_channel_req: "
820 "unknown channel %d", id);
821 if (!strcmp(rtype, "eow@openssh.com")) {
824 } else if ((c->type == SSH_CHANNEL_LARVAL ||
825 c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0)
826 success = session_input_channel_req(c, rtype);
827 if (reply && !(c->flags & CHAN_CLOSE_SENT)) {
828 packet_start(success ?
829 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
830 packet_put_int(c->remote_id);
838 server_init_dispatch(void)
840 debug("server_init_dispatch");
841 dispatch_init(&dispatch_protocol_error);
842 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
843 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
844 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
845 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
846 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open);
847 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
848 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
849 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req);
850 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
851 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request);
853 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive);
854 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive);
855 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive);
856 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive);
858 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);