2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * Server main loop for handling the interactive session.
7 * As far as I am concerned, the code I have written for this software
8 * can be used freely for any purpose. Any derived versions of this
9 * software must be clearly marked as such, and if the derived work is
10 * incompatible with the protocol description in the RFC file, it must be
11 * called by a name other than "ssh" or "Secure Shell".
13 * SSH2 support by Markus Friedl.
14 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 RCSID("$OpenBSD: serverloop.c,v 1.73 2001/07/02 13:59:14 markus Exp $");
53 #include "auth-options.h"
54 #include "serverloop.h"
58 extern ServerOptions options;
62 static Authctxt *xxx_authctxt;
64 static Buffer stdin_buffer; /* Buffer for stdin data. */
65 static Buffer stdout_buffer; /* Buffer for stdout data. */
66 static Buffer stderr_buffer; /* Buffer for stderr data. */
67 static int fdin; /* Descriptor for stdin (for writing) */
68 static int fdout; /* Descriptor for stdout (for reading);
69 May be same number as fdin. */
70 static int fderr; /* Descriptor for stderr. May be -1. */
71 static long stdin_bytes = 0; /* Number of bytes written to stdin. */
72 static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */
73 static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */
74 static long fdout_bytes = 0; /* Number of stdout bytes read from program. */
75 static int stdin_eof = 0; /* EOF message received from client. */
76 static int fdout_eof = 0; /* EOF encountered reading from fdout. */
77 static int fderr_eof = 0; /* EOF encountered readung from fderr. */
78 static int fdin_is_tty = 0; /* fdin points to a tty. */
79 static int connection_in; /* Connection to client (input). */
80 static int connection_out; /* Connection to client (output). */
81 static int connection_closed = 0; /* Connection to client closed. */
82 static u_int buffer_high; /* "Soft" max buffer size. */
85 * This SIGCHLD kludge is used to detect when the child exits. The server
86 * will exit after that, as soon as forwarded connections have terminated.
89 static volatile int child_terminated; /* The child has terminated. */
92 static void server_init_dispatch(void);
94 int client_alive_timeouts = 0;
97 sigchld_handler(int sig)
99 int save_errno = errno;
100 debug("Received SIGCHLD.");
101 child_terminated = 1;
102 mysignal(SIGCHLD, sigchld_handler);
107 * Make packets from buffered stderr data, and buffer it for sending
111 make_packets_from_stderr_data(void)
115 /* Send buffered stderr data to the client. */
116 while (buffer_len(&stderr_buffer) > 0 &&
117 packet_not_very_much_data_to_write()) {
118 len = buffer_len(&stderr_buffer);
119 if (packet_is_interactive()) {
123 /* Keep the packets at reasonable size. */
124 if (len > packet_get_maxsize())
125 len = packet_get_maxsize();
127 packet_start(SSH_SMSG_STDERR_DATA);
128 packet_put_string(buffer_ptr(&stderr_buffer), len);
130 buffer_consume(&stderr_buffer, len);
136 * Make packets from buffered stdout data, and buffer it for sending to the
140 make_packets_from_stdout_data(void)
144 /* Send buffered stdout data to the client. */
145 while (buffer_len(&stdout_buffer) > 0 &&
146 packet_not_very_much_data_to_write()) {
147 len = buffer_len(&stdout_buffer);
148 if (packet_is_interactive()) {
152 /* Keep the packets at reasonable size. */
153 if (len > packet_get_maxsize())
154 len = packet_get_maxsize();
156 packet_start(SSH_SMSG_STDOUT_DATA);
157 packet_put_string(buffer_ptr(&stdout_buffer), len);
159 buffer_consume(&stdout_buffer, len);
165 * Sleep in select() until we can do something. This will initialize the
166 * select masks. Upon return, the masks will indicate which descriptors
167 * have data or can accept data. Optionally, a maximum time can be specified
168 * for the duration of the wait (0 = infinite).
171 wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
172 u_int max_time_milliseconds)
174 struct timeval tv, *tvp;
176 int client_alive_scheduled = 0;
179 * if using client_alive, set the max timeout accordingly,
180 * and indicate that this particular timeout was for client
181 * alive by setting the client_alive_scheduled flag.
183 * this could be randomized somewhat to make traffic
184 * analysis more difficult, but we're not doing it yet.
186 if (max_time_milliseconds == 0 && options.client_alive_interval) {
187 client_alive_scheduled = 1;
188 max_time_milliseconds = options.client_alive_interval * 1000;
190 client_alive_scheduled = 0;
192 /* When select fails we restart from here. */
195 /* Allocate and update select() masks for channel descriptors. */
196 channel_prepare_select(readsetp, writesetp, maxfdp, 0);
199 /* wrong: bad condition XXX */
200 if (channel_not_very_much_buffered_data())
201 FD_SET(connection_in, *readsetp);
204 * Read packets from the client unless we have too much
205 * buffered stdin or channel data.
207 if (buffer_len(&stdin_buffer) < buffer_high &&
208 channel_not_very_much_buffered_data())
209 FD_SET(connection_in, *readsetp);
211 * If there is not too much data already buffered going to
212 * the client, try to get some more data from the program.
214 if (packet_not_very_much_data_to_write()) {
216 FD_SET(fdout, *readsetp);
218 FD_SET(fderr, *readsetp);
221 * If we have buffered data, try to write some of that data
224 if (fdin != -1 && buffer_len(&stdin_buffer) > 0)
225 FD_SET(fdin, *writesetp);
229 * If we have buffered packet data going to the client, mark that
232 if (packet_have_data_to_write())
233 FD_SET(connection_out, *writesetp);
236 * If child has terminated and there is enough buffer space to read
237 * from it, then read as much as is available and exit.
239 if (child_terminated && packet_not_very_much_data_to_write())
240 if (max_time_milliseconds == 0 || client_alive_scheduled)
241 max_time_milliseconds = 100;
243 if (max_time_milliseconds == 0)
246 tv.tv_sec = max_time_milliseconds / 1000;
247 tv.tv_usec = 1000 * (max_time_milliseconds % 1000);
251 debug3("tvp!=NULL kid %d mili %d", child_terminated, max_time_milliseconds);
253 /* Wait for something to happen, or the timeout to expire. */
254 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
258 error("select: %.100s", strerror(errno));
262 if (ret == 0 && client_alive_scheduled) {
263 /* timeout, check to see how many we have had */
264 client_alive_timeouts++;
266 if (client_alive_timeouts > options.client_alive_count_max ) {
268 "Timeout, your session not responding.");
271 * send a bogus channel request with "wantreply"
272 * we should get back a failure
276 id = channel_find_open();
278 channel_request_start(id,
279 "keepalive@openssh.com", 1);
283 "No open channels after timeout!");
289 * Processes input from the client and the program. Input data is stored
290 * in buffers and processed later.
293 process_input(fd_set * readset)
298 /* Read and buffer any input data from the client. */
299 if (FD_ISSET(connection_in, readset)) {
300 len = read(connection_in, buf, sizeof(buf));
302 verbose("Connection closed by remote host.");
303 connection_closed = 1;
307 } else if (len < 0) {
308 if (errno != EINTR && errno != EAGAIN) {
309 verbose("Read error from remote host: %.100s", strerror(errno));
313 /* Buffer any received data. */
314 packet_process_incoming(buf, len);
320 /* Read and buffer any available stdout data from the program. */
321 if (!fdout_eof && FD_ISSET(fdout, readset)) {
322 len = read(fdout, buf, sizeof(buf));
323 if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
325 } else if (len <= 0) {
328 buffer_append(&stdout_buffer, buf, len);
332 /* Read and buffer any available stderr data from the program. */
333 if (!fderr_eof && FD_ISSET(fderr, readset)) {
334 len = read(fderr, buf, sizeof(buf));
335 if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
337 } else if (len <= 0) {
340 buffer_append(&stderr_buffer, buf, len);
346 * Sends data from internal buffers to client program stdin.
349 process_output(fd_set * writeset)
354 /* Write buffered data to program stdin. */
355 if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) {
356 len = write(fdin, buffer_ptr(&stdin_buffer),
357 buffer_len(&stdin_buffer));
358 if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
360 } else if (len <= 0) {
367 shutdown(fdin, SHUT_WR); /* We will no longer send. */
371 /* Successful write. */
372 if (fdin_is_tty && tcgetattr(fdin, &tio) == 0 &&
373 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
375 * Simulate echo to reduce the impact of
378 packet_send_ignore(len);
381 /* Consume the data from the buffer. */
382 buffer_consume(&stdin_buffer, len);
383 /* Update the count of bytes written to the program. */
387 /* Send any buffered packet data to the client. */
388 if (FD_ISSET(connection_out, writeset))
393 * Wait until all buffered output has been sent to the client.
394 * This is used when the program terminates.
399 /* Send any buffered stdout data to the client. */
400 if (buffer_len(&stdout_buffer) > 0) {
401 packet_start(SSH_SMSG_STDOUT_DATA);
402 packet_put_string(buffer_ptr(&stdout_buffer),
403 buffer_len(&stdout_buffer));
405 /* Update the count of sent bytes. */
406 stdout_bytes += buffer_len(&stdout_buffer);
408 /* Send any buffered stderr data to the client. */
409 if (buffer_len(&stderr_buffer) > 0) {
410 packet_start(SSH_SMSG_STDERR_DATA);
411 packet_put_string(buffer_ptr(&stderr_buffer),
412 buffer_len(&stderr_buffer));
414 /* Update the count of sent bytes. */
415 stderr_bytes += buffer_len(&stderr_buffer);
417 /* Wait until all buffered data has been written to the client. */
422 process_buffered_input_packets(void)
424 dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL);
428 * Performs the interactive session. This handles data transmission between
429 * the client and the program. Note that the notion of stdin, stdout, and
430 * stderr in this function is sort of reversed: this function writes to
431 * stdin (of the child program), and reads from stdout and stderr (of the
435 server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
437 fd_set *readset = NULL, *writeset = NULL;
439 int wait_status; /* Status returned by wait(). */
440 pid_t wait_pid; /* pid returned by wait(). */
441 int waiting_termination = 0; /* Have displayed waiting close message. */
442 u_int max_time_milliseconds;
443 u_int previous_stdout_buffer_bytes;
444 u_int stdout_buffer_bytes;
447 debug("Entering interactive session.");
449 /* Initialize the SIGCHLD kludge. */
450 child_terminated = 0;
451 signal(SIGCHLD, sigchld_handler);
453 /* Initialize our global variables. */
461 /* we don't have stderr for interactive terminal sessions, see below */
465 if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin))
468 connection_in = packet_get_connection_in();
469 connection_out = packet_get_connection_out();
471 previous_stdout_buffer_bytes = 0;
473 /* Set approximate I/O buffer size. */
474 if (packet_is_interactive())
477 buffer_high = 64 * 1024;
479 /* Initialize max_fd to the maximum of the known file descriptors. */
480 max_fd = MAX(fdin, fdout);
482 max_fd = MAX(max_fd, fderr);
483 max_fd = MAX(max_fd, connection_in);
484 max_fd = MAX(max_fd, connection_out);
486 /* Initialize Initialize buffers. */
487 buffer_init(&stdin_buffer);
488 buffer_init(&stdout_buffer);
489 buffer_init(&stderr_buffer);
492 * If we have no separate fderr (which is the case when we have a pty
493 * - there we cannot make difference between data sent to stdout and
494 * stderr), indicate that we have seen an EOF from stderr. This way
495 * we don\'t need to check the descriptor everywhere.
500 server_init_dispatch();
502 /* Main loop of the server for the interactive session mode. */
505 /* Process buffered packets from the client. */
506 process_buffered_input_packets();
509 * If we have received eof, and there is no more pending
510 * input data, cause a real eof by closing fdin.
512 if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) {
519 shutdown(fdin, SHUT_WR); /* We will no longer send. */
523 /* Make packets from buffered stderr data to send to the client. */
524 make_packets_from_stderr_data();
527 * Make packets from buffered stdout data to send to the
528 * client. If there is very little to send, this arranges to
529 * not send them now, but to wait a short while to see if we
530 * are getting more data. This is necessary, as some systems
531 * wake up readers from a pty after each separate character.
533 max_time_milliseconds = 0;
534 stdout_buffer_bytes = buffer_len(&stdout_buffer);
535 if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 &&
536 stdout_buffer_bytes != previous_stdout_buffer_bytes) {
537 /* try again after a while */
538 max_time_milliseconds = 10;
541 make_packets_from_stdout_data();
543 previous_stdout_buffer_bytes = buffer_len(&stdout_buffer);
545 /* Send channel data to the client. */
546 if (packet_not_very_much_data_to_write())
547 channel_output_poll();
550 * Bail out of the loop if the program has closed its output
551 * descriptors, and we have no more data to send to the
552 * client, and there is no pending buffered data.
554 if (fdout_eof && fderr_eof && !packet_have_data_to_write() &&
555 buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) {
556 if (!channel_still_open())
558 if (!waiting_termination) {
559 const char *s = "Waiting for forwarded connections to terminate...\r\n";
561 waiting_termination = 1;
562 buffer_append(&stderr_buffer, s, strlen(s));
564 /* Display list of open channels. */
565 cp = channel_open_message();
566 buffer_append(&stderr_buffer, cp, strlen(cp));
570 /* Sleep in select() until we can do something. */
571 wait_until_can_do_something(&readset, &writeset, &max_fd,
572 max_time_milliseconds);
574 /* Process any channel events. */
575 channel_after_select(readset, writeset);
577 /* Process input from the client and from program stdout/stderr. */
578 process_input(readset);
580 /* Process output to the client and to program stdin. */
581 process_output(writeset);
588 /* Cleanup and termination code. */
590 /* Wait until all output has been sent to the client. */
593 debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.",
594 stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes);
596 /* Free and clear the buffers. */
597 buffer_free(&stdin_buffer);
598 buffer_free(&stdout_buffer);
599 buffer_free(&stderr_buffer);
601 /* Close the file descriptors. */
616 /* We no longer want our SIGCHLD handler to be called. */
617 signal(SIGCHLD, SIG_DFL);
619 wait_pid = waitpid(-1, &wait_status, child_terminated ? WNOHANG : 0);
621 packet_disconnect("wait: %.100s", strerror(errno));
622 else if (wait_pid != pid)
623 error("Strange, wait returned pid %d, expected %d",
626 /* Check if it exited normally. */
627 if (WIFEXITED(wait_status)) {
628 /* Yes, normal exit. Get exit status and send it to the client. */
629 debug("Command exited with status %d.", WEXITSTATUS(wait_status));
630 packet_start(SSH_SMSG_EXITSTATUS);
631 packet_put_int(WEXITSTATUS(wait_status));
636 * Wait for exit confirmation. Note that there might be
637 * other packets coming before it; however, the program has
638 * already died so we just ignore them. The client is
639 * supposed to respond with the confirmation when it receives
644 type = packet_read(&plen);
646 while (type != SSH_CMSG_EXIT_CONFIRMATION);
648 debug("Received exit confirmation.");
651 /* Check if the program terminated due to a signal. */
652 if (WIFSIGNALED(wait_status))
653 packet_disconnect("Command terminated on signal %d.",
654 WTERMSIG(wait_status));
656 /* Some weird exit cause. Just exit. */
657 packet_disconnect("wait returned status %04x.", wait_status);
662 server_loop2(Authctxt *authctxt)
664 fd_set *readset = NULL, *writeset = NULL;
665 int rekeying = 0, max_fd, status;
668 debug("Entering interactive session for SSH2.");
670 mysignal(SIGCHLD, sigchld_handler);
671 child_terminated = 0;
672 connection_in = packet_get_connection_in();
673 connection_out = packet_get_connection_out();
675 max_fd = MAX(connection_in, connection_out);
676 xxx_authctxt = authctxt;
678 server_init_dispatch();
681 process_buffered_input_packets();
683 rekeying = (xxx_kex != NULL && !xxx_kex->done);
685 if (!rekeying && packet_not_very_much_data_to_write())
686 channel_output_poll();
687 wait_until_can_do_something(&readset, &writeset, &max_fd,
689 if (child_terminated) {
690 while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
691 session_close_by_pid(pid, status);
692 child_terminated = 0;
695 channel_after_select(readset, writeset);
696 process_input(readset);
697 if (connection_closed)
699 process_output(writeset);
706 signal(SIGCHLD, SIG_DFL);
708 while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
709 session_close_by_pid(pid, status);
711 * there is a race between channel_free_all() killing children and
712 * children dying before kill()
716 while (session_have_children()) {
717 pid = waitpid(-1, &status, 0);
719 session_close_by_pid(pid, status);
721 error("waitpid returned %d: %s", pid, strerror(errno));
728 server_input_channel_failure(int type, int plen, void *ctxt)
730 debug("Got CHANNEL_FAILURE for keepalive");
732 * reset timeout, since we got a sane answer from the client.
733 * even if this was generated by something other than
734 * the bogus CHANNEL_REQUEST we send for keepalives.
736 client_alive_timeouts = 0;
741 server_input_stdin_data(int type, int plen, void *ctxt)
746 /* Stdin data from the client. Append it to the buffer. */
747 /* Ignore any data if the client has closed stdin. */
750 data = packet_get_string(&data_len);
751 packet_integrity_check(plen, (4 + data_len), type);
752 buffer_append(&stdin_buffer, data, data_len);
753 memset(data, 0, data_len);
758 server_input_eof(int type, int plen, void *ctxt)
761 * Eof from the client. The stdin descriptor to the
762 * program will be closed when all buffered data has
765 debug("EOF received for stdin.");
766 packet_integrity_check(plen, 0, type);
771 server_input_window_size(int type, int plen, void *ctxt)
773 int row = packet_get_int();
774 int col = packet_get_int();
775 int xpixel = packet_get_int();
776 int ypixel = packet_get_int();
778 debug("Window change received.");
779 packet_integrity_check(plen, 4 * 4, type);
781 pty_change_window_size(fdin, row, col, xpixel, ypixel);
785 server_request_direct_tcpip(char *ctype)
789 char *target, *originator;
790 int target_port, originator_port;
792 target = packet_get_string(NULL);
793 target_port = packet_get_int();
794 originator = packet_get_string(NULL);
795 originator_port = packet_get_int();
798 debug("server_request_direct_tcpip: originator %s port %d, target %s port %d",
799 originator, originator_port, target, target_port);
801 /* XXX check permission */
802 sock = channel_connect_to(target, target_port);
807 c = channel_new(ctype, SSH_CHANNEL_CONNECTING,
808 sock, sock, -1, CHAN_TCP_WINDOW_DEFAULT,
809 CHAN_TCP_PACKET_DEFAULT, 0, xstrdup("direct-tcpip"), 1);
811 error("server_request_direct_tcpip: channel_new failed");
818 server_request_session(char *ctype)
822 debug("input_session_request");
825 * A server session has no fd to read or write until a
826 * CHANNEL_REQUEST for a shell is made, so we set the type to
827 * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all
828 * CHANNEL_REQUEST messages is registered.
830 c = channel_new(ctype, SSH_CHANNEL_LARVAL,
831 -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT,
832 0, xstrdup("server-session"), 1);
834 error("server_request_session: channel_new failed");
837 if (session_open(xxx_authctxt, c->self) != 1) {
838 debug("session open failed, free channel %d", c->self);
842 channel_register_callback(c->self, SSH2_MSG_CHANNEL_REQUEST,
843 session_input_channel_req, (void *)0);
844 channel_register_cleanup(c->self, session_close_by_channel);
849 server_input_channel_open(int type, int plen, void *ctxt)
858 ctype = packet_get_string(&len);
859 rchan = packet_get_int();
860 rwindow = packet_get_int();
861 rmaxpack = packet_get_int();
863 debug("server_input_channel_open: ctype %s rchan %d win %d max %d",
864 ctype, rchan, rwindow, rmaxpack);
866 if (strcmp(ctype, "session") == 0) {
867 c = server_request_session(ctype);
868 } else if (strcmp(ctype, "direct-tcpip") == 0) {
869 c = server_request_direct_tcpip(ctype);
872 debug("server_input_channel_open: confirm %s", ctype);
873 c->remote_id = rchan;
874 c->remote_window = rwindow;
875 c->remote_maxpacket = rmaxpack;
876 if (c->type != SSH_CHANNEL_CONNECTING) {
877 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
878 packet_put_int(c->remote_id);
879 packet_put_int(c->self);
880 packet_put_int(c->local_window);
881 packet_put_int(c->local_maxpacket);
885 debug("server_input_channel_open: failure %s", ctype);
886 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
887 packet_put_int(rchan);
888 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
889 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
890 packet_put_cstring("open failed");
891 packet_put_cstring("");
899 server_input_global_request(int type, int plen, void *ctxt)
905 rtype = packet_get_string(NULL);
906 want_reply = packet_get_char();
907 debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply);
909 /* -R style forwarding */
910 if (strcmp(rtype, "tcpip-forward") == 0) {
912 char *listen_address;
915 pw = auth_get_user();
917 fatal("server_input_global_request: no user");
918 listen_address = packet_get_string(NULL); /* XXX currently ignored */
919 listen_port = (u_short)packet_get_int();
920 debug("server_input_global_request: tcpip-forward listen %s port %d",
921 listen_address, listen_port);
923 /* check permissions */
924 if (!options.allow_tcp_forwarding ||
925 no_port_forwarding_flag ||
926 (listen_port < IPPORT_RESERVED && pw->pw_uid != 0)) {
928 packet_send_debug("Server has disabled port forwarding.");
930 /* Start listening on the port */
931 success = channel_request_forwarding(
932 listen_address, listen_port,
933 /*unspec host_to_connect*/ "<unspec host>",
934 /*unspec port_to_connect*/ 0,
935 options.gateway_ports, /*remote*/ 1);
937 xfree(listen_address);
940 packet_start(success ?
941 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
949 server_init_dispatch_20(void)
951 debug("server_init_dispatch_20");
952 dispatch_init(&dispatch_protocol_error);
953 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
954 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
955 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
956 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
957 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open);
958 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
959 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
960 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request);
961 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
962 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request);
964 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_channel_failure);
966 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
969 server_init_dispatch_13(void)
971 debug("server_init_dispatch_13");
973 dispatch_set(SSH_CMSG_EOF, &server_input_eof);
974 dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data);
975 dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size);
976 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
977 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
978 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
979 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
980 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
981 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
984 server_init_dispatch_15(void)
986 server_init_dispatch_13();
987 debug("server_init_dispatch_15");
988 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
989 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose);
992 server_init_dispatch(void)
995 server_init_dispatch_20();
997 server_init_dispatch_13();
999 server_init_dispatch_15();