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 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 1.63 2001/04/29 19:16:52 markus Exp $");
53 #include "auth-options.h"
54 #include "serverloop.h"
58 extern ServerOptions options;
63 static Buffer stdin_buffer; /* Buffer for stdin data. */
64 static Buffer stdout_buffer; /* Buffer for stdout data. */
65 static Buffer stderr_buffer; /* Buffer for stderr data. */
66 static int fdin; /* Descriptor for stdin (for writing) */
67 static int fdout; /* Descriptor for stdout (for reading);
68 May be same number as fdin. */
69 static int fderr; /* Descriptor for stderr. May be -1. */
70 static long stdin_bytes = 0; /* Number of bytes written to stdin. */
71 static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */
72 static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */
73 static long fdout_bytes = 0; /* Number of stdout bytes read from program. */
74 static int stdin_eof = 0; /* EOF message received from client. */
75 static int fdout_eof = 0; /* EOF encountered reading from fdout. */
76 static int fderr_eof = 0; /* EOF encountered readung from fderr. */
77 static int fdin_is_tty = 0; /* fdin points to a tty. */
78 static int connection_in; /* Connection to client (input). */
79 static int connection_out; /* Connection to client (output). */
80 static int connection_closed = 0; /* Connection to client closed. */
81 static u_int buffer_high; /* "Soft" max buffer size. */
84 * This SIGCHLD kludge is used to detect when the child exits. The server
85 * will exit after that, as soon as forwarded connections have terminated.
88 static pid_t child_pid; /* Pid of the child. */
89 static volatile int child_terminated; /* The child has terminated. */
90 static volatile int child_wait_status; /* Status from wait(). */
92 void server_init_dispatch(void);
94 int client_alive_timeouts = 0;
97 sigchld_handler(int sig)
99 int save_errno = errno;
102 debug("Received SIGCHLD.");
103 wait_pid = wait((int *) &child_wait_status);
104 if (wait_pid != -1) {
105 if (wait_pid != child_pid)
106 error("Strange, got SIGCHLD and wait returned pid %d but child is %d",
107 wait_pid, child_pid);
108 if (WIFEXITED(child_wait_status) ||
109 WIFSIGNALED(child_wait_status))
110 child_terminated = 1;
112 signal(SIGCHLD, sigchld_handler);
116 sigchld_handler2(int sig)
118 int save_errno = errno;
119 debug("Received SIGCHLD.");
120 child_terminated = 1;
121 mysignal(SIGCHLD, sigchld_handler2);
126 * Make packets from buffered stderr data, and buffer it for sending
130 make_packets_from_stderr_data(void)
134 /* Send buffered stderr data to the client. */
135 while (buffer_len(&stderr_buffer) > 0 &&
136 packet_not_very_much_data_to_write()) {
137 len = buffer_len(&stderr_buffer);
138 if (packet_is_interactive()) {
142 /* Keep the packets at reasonable size. */
143 if (len > packet_get_maxsize())
144 len = packet_get_maxsize();
146 packet_start(SSH_SMSG_STDERR_DATA);
147 packet_put_string(buffer_ptr(&stderr_buffer), len);
149 buffer_consume(&stderr_buffer, len);
155 * Make packets from buffered stdout data, and buffer it for sending to the
159 make_packets_from_stdout_data(void)
163 /* Send buffered stdout data to the client. */
164 while (buffer_len(&stdout_buffer) > 0 &&
165 packet_not_very_much_data_to_write()) {
166 len = buffer_len(&stdout_buffer);
167 if (packet_is_interactive()) {
171 /* Keep the packets at reasonable size. */
172 if (len > packet_get_maxsize())
173 len = packet_get_maxsize();
175 packet_start(SSH_SMSG_STDOUT_DATA);
176 packet_put_string(buffer_ptr(&stdout_buffer), len);
178 buffer_consume(&stdout_buffer, len);
184 * Sleep in select() until we can do something. This will initialize the
185 * select masks. Upon return, the masks will indicate which descriptors
186 * have data or can accept data. Optionally, a maximum time can be specified
187 * for the duration of the wait (0 = infinite).
190 wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
191 u_int max_time_milliseconds)
193 struct timeval tv, *tvp;
195 int client_alive_scheduled = 0;
198 * if using client_alive, set the max timeout accordingly,
199 * and indicate that this particular timeout was for client
200 * alive by setting the client_alive_scheduled flag.
202 * this could be randomized somewhat to make traffic
203 * analysis more difficult, but we're not doing it yet.
205 if (max_time_milliseconds == 0 && options.client_alive_interval) {
206 client_alive_scheduled = 1;
207 max_time_milliseconds = options.client_alive_interval * 1000;
209 client_alive_scheduled = 0;
211 /* When select fails we restart from here. */
214 /* Allocate and update select() masks for channel descriptors. */
215 channel_prepare_select(readsetp, writesetp, maxfdp, 0);
218 /* wrong: bad condition XXX */
219 if (channel_not_very_much_buffered_data())
220 FD_SET(connection_in, *readsetp);
223 * Read packets from the client unless we have too much
224 * buffered stdin or channel data.
226 if (buffer_len(&stdin_buffer) < buffer_high &&
227 channel_not_very_much_buffered_data())
228 FD_SET(connection_in, *readsetp);
230 * If there is not too much data already buffered going to
231 * the client, try to get some more data from the program.
233 if (packet_not_very_much_data_to_write()) {
235 FD_SET(fdout, *readsetp);
237 FD_SET(fderr, *readsetp);
240 * If we have buffered data, try to write some of that data
243 if (fdin != -1 && buffer_len(&stdin_buffer) > 0)
244 FD_SET(fdin, *writesetp);
248 * If we have buffered packet data going to the client, mark that
251 if (packet_have_data_to_write())
252 FD_SET(connection_out, *writesetp);
255 * If child has terminated and there is enough buffer space to read
256 * from it, then read as much as is available and exit.
258 if (child_terminated && packet_not_very_much_data_to_write())
259 if (max_time_milliseconds == 0 || client_alive_scheduled)
260 max_time_milliseconds = 100;
262 if (max_time_milliseconds == 0)
265 tv.tv_sec = max_time_milliseconds / 1000;
266 tv.tv_usec = 1000 * (max_time_milliseconds % 1000);
270 debug3("tvp!=NULL kid %d mili %d", child_terminated, max_time_milliseconds);
272 /* Wait for something to happen, or the timeout to expire. */
273 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
277 error("select: %.100s", strerror(errno));
281 if (ret == 0 && client_alive_scheduled) {
282 /* timeout, check to see how many we have had */
283 client_alive_timeouts++;
285 if (client_alive_timeouts > options.client_alive_count_max ) {
287 "Timeout, your session not responding.");
290 * send a bogus channel request with "wantreply"
291 * we should get back a failure
295 id = channel_find_open();
297 channel_request_start(id,
298 "keepalive@openssh.com", 1);
302 "No open channels after timeout!");
308 * Processes input from the client and the program. Input data is stored
309 * in buffers and processed later.
312 process_input(fd_set * readset)
317 /* Read and buffer any input data from the client. */
318 if (FD_ISSET(connection_in, readset)) {
319 len = read(connection_in, buf, sizeof(buf));
321 verbose("Connection closed by remote host.");
322 connection_closed = 1;
326 } else if (len < 0) {
327 if (errno != EINTR && errno != EAGAIN) {
328 verbose("Read error from remote host: %.100s", strerror(errno));
332 /* Buffer any received data. */
333 packet_process_incoming(buf, len);
339 /* Read and buffer any available stdout data from the program. */
340 if (!fdout_eof && FD_ISSET(fdout, readset)) {
341 len = read(fdout, buf, sizeof(buf));
342 if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
344 } else if (len <= 0) {
347 buffer_append(&stdout_buffer, buf, len);
351 /* Read and buffer any available stderr data from the program. */
352 if (!fderr_eof && FD_ISSET(fderr, readset)) {
353 len = read(fderr, buf, sizeof(buf));
354 if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
356 } else if (len <= 0) {
359 buffer_append(&stderr_buffer, buf, len);
365 * Sends data from internal buffers to client program stdin.
368 process_output(fd_set * writeset)
373 /* Write buffered data to program stdin. */
374 if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) {
375 len = write(fdin, buffer_ptr(&stdin_buffer),
376 buffer_len(&stdin_buffer));
377 if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
379 } else if (len <= 0) {
386 shutdown(fdin, SHUT_WR); /* We will no longer send. */
390 /* Successful write. */
391 if (fdin_is_tty && tcgetattr(fdin, &tio) == 0 &&
392 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
394 * Simulate echo to reduce the impact of
397 packet_send_ignore(len);
400 /* Consume the data from the buffer. */
401 buffer_consume(&stdin_buffer, len);
402 /* Update the count of bytes written to the program. */
406 /* Send any buffered packet data to the client. */
407 if (FD_ISSET(connection_out, writeset))
412 * Wait until all buffered output has been sent to the client.
413 * This is used when the program terminates.
418 /* Send any buffered stdout data to the client. */
419 if (buffer_len(&stdout_buffer) > 0) {
420 packet_start(SSH_SMSG_STDOUT_DATA);
421 packet_put_string(buffer_ptr(&stdout_buffer),
422 buffer_len(&stdout_buffer));
424 /* Update the count of sent bytes. */
425 stdout_bytes += buffer_len(&stdout_buffer);
427 /* Send any buffered stderr data to the client. */
428 if (buffer_len(&stderr_buffer) > 0) {
429 packet_start(SSH_SMSG_STDERR_DATA);
430 packet_put_string(buffer_ptr(&stderr_buffer),
431 buffer_len(&stderr_buffer));
433 /* Update the count of sent bytes. */
434 stderr_bytes += buffer_len(&stderr_buffer);
436 /* Wait until all buffered data has been written to the client. */
441 process_buffered_input_packets(void)
443 dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL);
447 * Performs the interactive session. This handles data transmission between
448 * the client and the program. Note that the notion of stdin, stdout, and
449 * stderr in this function is sort of reversed: this function writes to
450 * stdin (of the child program), and reads from stdout and stderr (of the
454 server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
456 fd_set *readset = NULL, *writeset = NULL;
458 int wait_status; /* Status returned by wait(). */
459 pid_t wait_pid; /* pid returned by wait(). */
460 int waiting_termination = 0; /* Have displayed waiting close message. */
461 u_int max_time_milliseconds;
462 u_int previous_stdout_buffer_bytes;
463 u_int stdout_buffer_bytes;
466 debug("Entering interactive session.");
468 /* Initialize the SIGCHLD kludge. */
470 child_terminated = 0;
471 signal(SIGCHLD, sigchld_handler);
473 /* Initialize our global variables. */
481 /* we don't have stderr for interactive terminal sessions, see below */
485 if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin))
488 connection_in = packet_get_connection_in();
489 connection_out = packet_get_connection_out();
491 previous_stdout_buffer_bytes = 0;
493 /* Set approximate I/O buffer size. */
494 if (packet_is_interactive())
497 buffer_high = 64 * 1024;
499 /* Initialize max_fd to the maximum of the known file descriptors. */
500 max_fd = MAX(fdin, fdout);
502 max_fd = MAX(max_fd, fderr);
503 max_fd = MAX(max_fd, connection_in);
504 max_fd = MAX(max_fd, connection_out);
506 /* Initialize Initialize buffers. */
507 buffer_init(&stdin_buffer);
508 buffer_init(&stdout_buffer);
509 buffer_init(&stderr_buffer);
512 * If we have no separate fderr (which is the case when we have a pty
513 * - there we cannot make difference between data sent to stdout and
514 * stderr), indicate that we have seen an EOF from stderr. This way
515 * we don\'t need to check the descriptor everywhere.
520 server_init_dispatch();
522 /* Main loop of the server for the interactive session mode. */
525 /* Process buffered packets from the client. */
526 process_buffered_input_packets();
529 * If we have received eof, and there is no more pending
530 * input data, cause a real eof by closing fdin.
532 if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) {
539 shutdown(fdin, SHUT_WR); /* We will no longer send. */
543 /* Make packets from buffered stderr data to send to the client. */
544 make_packets_from_stderr_data();
547 * Make packets from buffered stdout data to send to the
548 * client. If there is very little to send, this arranges to
549 * not send them now, but to wait a short while to see if we
550 * are getting more data. This is necessary, as some systems
551 * wake up readers from a pty after each separate character.
553 max_time_milliseconds = 0;
554 stdout_buffer_bytes = buffer_len(&stdout_buffer);
555 if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 &&
556 stdout_buffer_bytes != previous_stdout_buffer_bytes) {
557 /* try again after a while */
558 max_time_milliseconds = 10;
561 make_packets_from_stdout_data();
563 previous_stdout_buffer_bytes = buffer_len(&stdout_buffer);
565 /* Send channel data to the client. */
566 if (packet_not_very_much_data_to_write())
567 channel_output_poll();
570 * Bail out of the loop if the program has closed its output
571 * descriptors, and we have no more data to send to the
572 * client, and there is no pending buffered data.
574 if (fdout_eof && fderr_eof && !packet_have_data_to_write() &&
575 buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) {
576 if (!channel_still_open())
578 if (!waiting_termination) {
579 const char *s = "Waiting for forwarded connections to terminate...\r\n";
581 waiting_termination = 1;
582 buffer_append(&stderr_buffer, s, strlen(s));
584 /* Display list of open channels. */
585 cp = channel_open_message();
586 buffer_append(&stderr_buffer, cp, strlen(cp));
590 /* Sleep in select() until we can do something. */
591 wait_until_can_do_something(&readset, &writeset, &max_fd,
592 max_time_milliseconds);
594 /* Process any channel events. */
595 channel_after_select(readset, writeset);
597 /* Process input from the client and from program stdout/stderr. */
598 process_input(readset);
600 /* Process output to the client and to program stdin. */
601 process_output(writeset);
608 /* Cleanup and termination code. */
610 /* Wait until all output has been sent to the client. */
613 debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.",
614 stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes);
616 /* Free and clear the buffers. */
617 buffer_free(&stdin_buffer);
618 buffer_free(&stdout_buffer);
619 buffer_free(&stderr_buffer);
621 /* Close the file descriptors. */
634 /* Stop listening for channels; this removes unix domain sockets. */
635 channel_stop_listening();
637 /* Wait for the child to exit. Get its exit status. */
638 wait_pid = wait(&wait_status);
639 if (wait_pid == -1) {
641 * It is possible that the wait was handled by SIGCHLD
642 * handler. This may result in either: this call
643 * returning with EINTR, or: this call returning ECHILD.
645 if (child_terminated)
646 wait_status = child_wait_status;
648 packet_disconnect("wait: %.100s", strerror(errno));
650 /* Check if it matches the process we forked. */
652 error("Strange, wait returned pid %d, expected %d",
656 /* We no longer want our SIGCHLD handler to be called. */
657 signal(SIGCHLD, SIG_DFL);
659 /* Check if it exited normally. */
660 if (WIFEXITED(wait_status)) {
661 /* Yes, normal exit. Get exit status and send it to the client. */
662 debug("Command exited with status %d.", WEXITSTATUS(wait_status));
663 packet_start(SSH_SMSG_EXITSTATUS);
664 packet_put_int(WEXITSTATUS(wait_status));
669 * Wait for exit confirmation. Note that there might be
670 * other packets coming before it; however, the program has
671 * already died so we just ignore them. The client is
672 * supposed to respond with the confirmation when it receives
677 type = packet_read(&plen);
679 while (type != SSH_CMSG_EXIT_CONFIRMATION);
681 debug("Received exit confirmation.");
684 /* Check if the program terminated due to a signal. */
685 if (WIFSIGNALED(wait_status))
686 packet_disconnect("Command terminated on signal %d.",
687 WTERMSIG(wait_status));
689 /* Some weird exit cause. Just exit. */
690 packet_disconnect("wait returned status %04x.", wait_status);
697 fd_set *readset = NULL, *writeset = NULL;
698 int rekeying = 0, max_fd, status;
701 debug("Entering interactive session for SSH2.");
703 mysignal(SIGCHLD, sigchld_handler2);
704 child_terminated = 0;
705 connection_in = packet_get_connection_in();
706 connection_out = packet_get_connection_out();
708 max_fd = MAX(connection_in, connection_out);
710 server_init_dispatch();
713 process_buffered_input_packets();
715 rekeying = (xxx_kex != NULL && !xxx_kex->done);
717 if (!rekeying && packet_not_very_much_data_to_write())
718 channel_output_poll();
719 wait_until_can_do_something(&readset, &writeset, &max_fd,
721 if (child_terminated) {
722 while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
723 session_close_by_pid(pid, status);
724 child_terminated = 0;
727 channel_after_select(readset, writeset);
728 process_input(readset);
729 if (connection_closed)
731 process_output(writeset);
738 signal(SIGCHLD, SIG_DFL);
739 while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
740 session_close_by_pid(pid, status);
741 channel_stop_listening();
745 server_input_channel_failure(int type, int plen, void *ctxt)
747 debug("Got CHANNEL_FAILURE for keepalive");
749 * reset timeout, since we got a sane answer from the client.
750 * even if this was generated by something other than
751 * the bogus CHANNEL_REQUEST we send for keepalives.
753 client_alive_timeouts = 0;
758 server_input_stdin_data(int type, int plen, void *ctxt)
763 /* Stdin data from the client. Append it to the buffer. */
764 /* Ignore any data if the client has closed stdin. */
767 data = packet_get_string(&data_len);
768 packet_integrity_check(plen, (4 + data_len), type);
769 buffer_append(&stdin_buffer, data, data_len);
770 memset(data, 0, data_len);
775 server_input_eof(int type, int plen, void *ctxt)
778 * Eof from the client. The stdin descriptor to the
779 * program will be closed when all buffered data has
782 debug("EOF received for stdin.");
783 packet_integrity_check(plen, 0, type);
788 server_input_window_size(int type, int plen, void *ctxt)
790 int row = packet_get_int();
791 int col = packet_get_int();
792 int xpixel = packet_get_int();
793 int ypixel = packet_get_int();
795 debug("Window change received.");
796 packet_integrity_check(plen, 4 * 4, type);
798 pty_change_window_size(fdin, row, col, xpixel, ypixel);
802 server_request_direct_tcpip(char *ctype)
805 char *target, *originator;
806 int target_port, originator_port;
808 target = packet_get_string(NULL);
809 target_port = packet_get_int();
810 originator = packet_get_string(NULL);
811 originator_port = packet_get_int();
814 debug("server_request_direct_tcpip: originator %s port %d, target %s port %d",
815 originator, originator_port, target, target_port);
817 /* XXX check permission */
818 sock = channel_connect_to(target, target_port);
823 newch = channel_new(ctype, SSH_CHANNEL_CONNECTING,
824 sock, sock, -1, CHAN_TCP_WINDOW_DEFAULT,
825 CHAN_TCP_PACKET_DEFAULT, 0, xstrdup("direct-tcpip"), 1);
826 return (newch >= 0) ? channel_lookup(newch) : NULL;
830 server_request_session(char *ctype)
834 debug("input_session_request");
837 * A server session has no fd to read or write until a
838 * CHANNEL_REQUEST for a shell is made, so we set the type to
839 * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all
840 * CHANNEL_REQUEST messages is registered.
842 newch = channel_new(ctype, SSH_CHANNEL_LARVAL,
843 -1, -1, -1, 0, CHAN_SES_PACKET_DEFAULT,
844 0, xstrdup("server-session"), 1);
845 if (session_open(newch) == 1) {
846 channel_register_callback(newch, SSH2_MSG_CHANNEL_REQUEST,
847 session_input_channel_req, (void *)0);
848 channel_register_cleanup(newch, session_close_by_channel);
849 return channel_lookup(newch);
851 debug("session open failed, free channel %d", newch);
858 server_input_channel_open(int type, int plen, void *ctxt)
867 ctype = packet_get_string(&len);
868 rchan = packet_get_int();
869 rwindow = packet_get_int();
870 rmaxpack = packet_get_int();
872 debug("server_input_channel_open: ctype %s rchan %d win %d max %d",
873 ctype, rchan, rwindow, rmaxpack);
875 if (strcmp(ctype, "session") == 0) {
876 c = server_request_session(ctype);
877 } else if (strcmp(ctype, "direct-tcpip") == 0) {
878 c = server_request_direct_tcpip(ctype);
881 debug("server_input_channel_open: confirm %s", ctype);
882 c->remote_id = rchan;
883 c->remote_window = rwindow;
884 c->remote_maxpacket = rmaxpack;
886 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
887 packet_put_int(c->remote_id);
888 packet_put_int(c->self);
889 packet_put_int(c->local_window);
890 packet_put_int(c->local_maxpacket);
893 debug("server_input_channel_open: failure %s", ctype);
894 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
895 packet_put_int(rchan);
896 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
897 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
898 packet_put_cstring("bla bla");
899 packet_put_cstring("");
907 server_input_global_request(int type, int plen, void *ctxt)
913 rtype = packet_get_string(NULL);
914 want_reply = packet_get_char();
915 debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply);
917 /* -R style forwarding */
918 if (strcmp(rtype, "tcpip-forward") == 0) {
920 char *listen_address;
923 pw = auth_get_user();
925 fatal("server_input_global_request: no user");
926 listen_address = packet_get_string(NULL); /* XXX currently ignored */
927 listen_port = (u_short)packet_get_int();
928 debug("server_input_global_request: tcpip-forward listen %s port %d",
929 listen_address, listen_port);
931 /* check permissions */
932 if (!options.allow_tcp_forwarding ||
933 no_port_forwarding_flag ||
934 (listen_port < IPPORT_RESERVED && pw->pw_uid != 0)) {
936 packet_send_debug("Server has disabled port forwarding.");
938 /* Start listening on the port */
939 success = channel_request_forwarding(
940 listen_address, listen_port,
941 /*unspec host_to_connect*/ "<unspec host>",
942 /*unspec port_to_connect*/ 0,
943 options.gateway_ports, /*remote*/ 1);
945 xfree(listen_address);
948 packet_start(success ?
949 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
957 server_init_dispatch_20(void)
959 debug("server_init_dispatch_20");
960 dispatch_init(&dispatch_protocol_error);
961 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
962 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
963 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
964 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
965 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open);
966 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
967 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
968 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request);
969 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
970 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request);
972 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_channel_failure);
974 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
977 server_init_dispatch_13(void)
979 debug("server_init_dispatch_13");
981 dispatch_set(SSH_CMSG_EOF, &server_input_eof);
982 dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data);
983 dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size);
984 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
985 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
986 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
987 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
988 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
989 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
992 server_init_dispatch_15(void)
994 server_init_dispatch_13();
995 debug("server_init_dispatch_15");
996 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
997 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose);
1000 server_init_dispatch(void)
1003 server_init_dispatch_20();
1005 server_init_dispatch_13();
1007 server_init_dispatch_15();