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 1.86 2001/12/19 07:18:56 deraadt 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. */
83 static int client_alive_timeouts = 0;
86 * This SIGCHLD kludge is used to detect when the child exits. The server
87 * will exit after that, as soon as forwarded connections have terminated.
90 static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */
93 static void server_init_dispatch(void);
96 sigchld_handler(int sig)
98 int save_errno = errno;
99 debug("Received SIGCHLD.");
100 child_terminated = 1;
101 mysignal(SIGCHLD, sigchld_handler);
106 * Make packets from buffered stderr data, and buffer it for sending
110 make_packets_from_stderr_data(void)
114 /* Send buffered stderr data to the client. */
115 while (buffer_len(&stderr_buffer) > 0 &&
116 packet_not_very_much_data_to_write()) {
117 len = buffer_len(&stderr_buffer);
118 if (packet_is_interactive()) {
122 /* Keep the packets at reasonable size. */
123 if (len > packet_get_maxsize())
124 len = packet_get_maxsize();
126 packet_start(SSH_SMSG_STDERR_DATA);
127 packet_put_string(buffer_ptr(&stderr_buffer), len);
129 buffer_consume(&stderr_buffer, len);
135 * Make packets from buffered stdout data, and buffer it for sending to the
139 make_packets_from_stdout_data(void)
143 /* Send buffered stdout data to the client. */
144 while (buffer_len(&stdout_buffer) > 0 &&
145 packet_not_very_much_data_to_write()) {
146 len = buffer_len(&stdout_buffer);
147 if (packet_is_interactive()) {
151 /* Keep the packets at reasonable size. */
152 if (len > packet_get_maxsize())
153 len = packet_get_maxsize();
155 packet_start(SSH_SMSG_STDOUT_DATA);
156 packet_put_string(buffer_ptr(&stdout_buffer), len);
158 buffer_consume(&stdout_buffer, len);
164 client_alive_check(void)
168 /* timeout, check to see how many we have had */
169 if (++client_alive_timeouts > options.client_alive_count_max)
170 packet_disconnect("Timeout, your session not responding.");
172 id = channel_find_open();
174 packet_disconnect("No open channels after timeout!");
176 * send a bogus channel request with "wantreply",
177 * we should get back a failure
179 channel_request_start(id, "keepalive@openssh.com", 1);
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 int *nallocp, 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.
206 max_time_milliseconds == 0 && options.client_alive_interval) {
207 client_alive_scheduled = 1;
208 max_time_milliseconds = options.client_alive_interval * 1000;
211 /* Allocate and update select() masks for channel descriptors. */
212 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 0);
216 /* wrong: bad condition XXX */
217 if (channel_not_very_much_buffered_data())
219 FD_SET(connection_in, *readsetp);
222 * Read packets from the client unless we have too much
223 * buffered stdin or channel data.
225 if (buffer_len(&stdin_buffer) < buffer_high &&
226 channel_not_very_much_buffered_data())
227 FD_SET(connection_in, *readsetp);
229 * If there is not too much data already buffered going to
230 * the client, try to get some more data from the program.
232 if (packet_not_very_much_data_to_write()) {
234 FD_SET(fdout, *readsetp);
236 FD_SET(fderr, *readsetp);
239 * If we have buffered data, try to write some of that data
242 if (fdin != -1 && buffer_len(&stdin_buffer) > 0)
243 FD_SET(fdin, *writesetp);
247 * If we have buffered packet data going to the client, mark that
250 if (packet_have_data_to_write())
251 FD_SET(connection_out, *writesetp);
254 * If child has terminated and there is enough buffer space to read
255 * from it, then read as much as is available and exit.
257 if (child_terminated && packet_not_very_much_data_to_write())
258 if (max_time_milliseconds == 0 || client_alive_scheduled)
259 max_time_milliseconds = 100;
261 if (max_time_milliseconds == 0)
264 tv.tv_sec = max_time_milliseconds / 1000;
265 tv.tv_usec = 1000 * (max_time_milliseconds % 1000);
269 debug3("tvp!=NULL kid %d mili %d", (int) child_terminated,
270 max_time_milliseconds);
272 /* Wait for something to happen, or the timeout to expire. */
273 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
276 memset(*readsetp, 0, *nallocp);
277 memset(*writesetp, 0, *nallocp);
279 error("select: %.100s", strerror(errno));
280 } else if (ret == 0 && client_alive_scheduled)
281 client_alive_check();
285 * Processes input from the client and the program. Input data is stored
286 * in buffers and processed later.
289 process_input(fd_set * readset)
294 /* Read and buffer any input data from the client. */
295 if (FD_ISSET(connection_in, readset)) {
296 len = read(connection_in, buf, sizeof(buf));
298 verbose("Connection closed by remote host.");
299 connection_closed = 1;
303 } else if (len < 0) {
304 if (errno != EINTR && errno != EAGAIN) {
305 verbose("Read error from remote host: %.100s", strerror(errno));
309 /* Buffer any received data. */
310 packet_process_incoming(buf, len);
316 /* Read and buffer any available stdout data from the program. */
317 if (!fdout_eof && FD_ISSET(fdout, readset)) {
318 len = read(fdout, buf, sizeof(buf));
319 if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
321 } else if (len <= 0) {
324 buffer_append(&stdout_buffer, buf, len);
328 /* Read and buffer any available stderr data from the program. */
329 if (!fderr_eof && FD_ISSET(fderr, readset)) {
330 len = read(fderr, buf, sizeof(buf));
331 if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
333 } else if (len <= 0) {
336 buffer_append(&stderr_buffer, buf, len);
342 * Sends data from internal buffers to client program stdin.
345 process_output(fd_set * writeset)
352 /* Write buffered data to program stdin. */
353 if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) {
354 data = buffer_ptr(&stdin_buffer);
355 dlen = buffer_len(&stdin_buffer);
356 len = write(fdin, data, dlen);
357 if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
359 } else if (len <= 0) {
366 shutdown(fdin, SHUT_WR); /* We will no longer send. */
370 /* Successful write. */
371 if (fdin_is_tty && dlen >= 1 && data[0] != '\r' &&
372 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;
438 int max_fd = 0, nalloc = 0;
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 mysignal(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;
480 /* Initialize max_fd to the maximum of the known file descriptors. */
481 max_fd = MAX(connection_in, connection_out);
482 max_fd = MAX(max_fd, fdin);
483 max_fd = MAX(max_fd, fdout);
485 max_fd = MAX(max_fd, fderr);
488 /* Initialize Initialize buffers. */
489 buffer_init(&stdin_buffer);
490 buffer_init(&stdout_buffer);
491 buffer_init(&stderr_buffer);
494 * If we have no separate fderr (which is the case when we have a pty
495 * - there we cannot make difference between data sent to stdout and
496 * stderr), indicate that we have seen an EOF from stderr. This way
497 * we don\'t need to check the descriptor everywhere.
502 server_init_dispatch();
504 /* Main loop of the server for the interactive session mode. */
507 /* Process buffered packets from the client. */
508 process_buffered_input_packets();
511 * If we have received eof, and there is no more pending
512 * input data, cause a real eof by closing fdin.
514 if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) {
521 shutdown(fdin, SHUT_WR); /* We will no longer send. */
525 /* Make packets from buffered stderr data to send to the client. */
526 make_packets_from_stderr_data();
529 * Make packets from buffered stdout data to send to the
530 * client. If there is very little to send, this arranges to
531 * not send them now, but to wait a short while to see if we
532 * are getting more data. This is necessary, as some systems
533 * wake up readers from a pty after each separate character.
535 max_time_milliseconds = 0;
536 stdout_buffer_bytes = buffer_len(&stdout_buffer);
537 if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 &&
538 stdout_buffer_bytes != previous_stdout_buffer_bytes) {
539 /* try again after a while */
540 max_time_milliseconds = 10;
543 make_packets_from_stdout_data();
545 previous_stdout_buffer_bytes = buffer_len(&stdout_buffer);
547 /* Send channel data to the client. */
548 if (packet_not_very_much_data_to_write())
549 channel_output_poll();
552 * Bail out of the loop if the program has closed its output
553 * descriptors, and we have no more data to send to the
554 * client, and there is no pending buffered data.
556 if (fdout_eof && fderr_eof && !packet_have_data_to_write() &&
557 buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) {
558 if (!channel_still_open())
560 if (!waiting_termination) {
561 const char *s = "Waiting for forwarded connections to terminate...\r\n";
563 waiting_termination = 1;
564 buffer_append(&stderr_buffer, s, strlen(s));
566 /* Display list of open channels. */
567 cp = channel_open_message();
568 buffer_append(&stderr_buffer, cp, strlen(cp));
572 max_fd = MAX(connection_in, connection_out);
573 max_fd = MAX(max_fd, fdin);
574 max_fd = MAX(max_fd, fdout);
575 max_fd = MAX(max_fd, fderr);
577 /* Sleep in select() until we can do something. */
578 wait_until_can_do_something(&readset, &writeset, &max_fd,
579 &nalloc, max_time_milliseconds);
581 /* Process any channel events. */
582 channel_after_select(readset, writeset);
584 /* Process input from the client and from program stdout/stderr. */
585 process_input(readset);
587 /* Process output to the client and to program stdin. */
588 process_output(writeset);
595 /* Cleanup and termination code. */
597 /* Wait until all output has been sent to the client. */
600 debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.",
601 stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes);
603 /* Free and clear the buffers. */
604 buffer_free(&stdin_buffer);
605 buffer_free(&stdout_buffer);
606 buffer_free(&stderr_buffer);
608 /* Close the file descriptors. */
623 /* We no longer want our SIGCHLD handler to be called. */
624 mysignal(SIGCHLD, SIG_DFL);
626 wait_pid = waitpid(-1, &wait_status, child_terminated ? WNOHANG : 0);
628 packet_disconnect("wait: %.100s", strerror(errno));
629 else if (wait_pid != pid)
630 error("Strange, wait returned pid %d, expected %d",
633 /* Check if it exited normally. */
634 if (WIFEXITED(wait_status)) {
635 /* Yes, normal exit. Get exit status and send it to the client. */
636 debug("Command exited with status %d.", WEXITSTATUS(wait_status));
637 packet_start(SSH_SMSG_EXITSTATUS);
638 packet_put_int(WEXITSTATUS(wait_status));
643 * Wait for exit confirmation. Note that there might be
644 * other packets coming before it; however, the program has
645 * already died so we just ignore them. The client is
646 * supposed to respond with the confirmation when it receives
651 type = packet_read(&plen);
653 while (type != SSH_CMSG_EXIT_CONFIRMATION);
655 debug("Received exit confirmation.");
658 /* Check if the program terminated due to a signal. */
659 if (WIFSIGNALED(wait_status))
660 packet_disconnect("Command terminated on signal %d.",
661 WTERMSIG(wait_status));
663 /* Some weird exit cause. Just exit. */
664 packet_disconnect("wait returned status %04x.", wait_status);
669 collect_children(void)
675 /* block SIGCHLD while we check for dead children */
677 sigaddset(&nset, SIGCHLD);
678 sigprocmask(SIG_BLOCK, &nset, &oset);
679 if (child_terminated) {
680 while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
681 session_close_by_pid(pid, status);
682 child_terminated = 0;
684 sigprocmask(SIG_SETMASK, &oset, NULL);
688 server_loop2(Authctxt *authctxt)
690 fd_set *readset = NULL, *writeset = NULL;
691 int rekeying = 0, max_fd, nalloc = 0;
693 debug("Entering interactive session for SSH2.");
695 mysignal(SIGCHLD, sigchld_handler);
696 child_terminated = 0;
697 connection_in = packet_get_connection_in();
698 connection_out = packet_get_connection_out();
700 max_fd = MAX(connection_in, connection_out);
701 xxx_authctxt = authctxt;
703 server_init_dispatch();
706 process_buffered_input_packets();
708 rekeying = (xxx_kex != NULL && !xxx_kex->done);
710 if (!rekeying && packet_not_very_much_data_to_write())
711 channel_output_poll();
712 wait_until_can_do_something(&readset, &writeset, &max_fd,
717 channel_after_select(readset, writeset);
718 process_input(readset);
719 if (connection_closed)
721 process_output(writeset);
730 /* free all channels, no more reads and writes */
733 /* free remaining sessions, e.g. remove wtmp entries */
734 session_destroy_all();
738 server_input_channel_failure(int type, int plen, void *ctxt)
740 debug("Got CHANNEL_FAILURE for keepalive");
742 * reset timeout, since we got a sane answer from the client.
743 * even if this was generated by something other than
744 * the bogus CHANNEL_REQUEST we send for keepalives.
746 client_alive_timeouts = 0;
751 server_input_stdin_data(int type, int plen, void *ctxt)
756 /* Stdin data from the client. Append it to the buffer. */
757 /* Ignore any data if the client has closed stdin. */
760 data = packet_get_string(&data_len);
761 packet_integrity_check(plen, (4 + data_len), type);
762 buffer_append(&stdin_buffer, data, data_len);
763 memset(data, 0, data_len);
768 server_input_eof(int type, int plen, void *ctxt)
771 * Eof from the client. The stdin descriptor to the
772 * program will be closed when all buffered data has
775 debug("EOF received for stdin.");
776 packet_integrity_check(plen, 0, type);
781 server_input_window_size(int type, int plen, void *ctxt)
783 int row = packet_get_int();
784 int col = packet_get_int();
785 int xpixel = packet_get_int();
786 int ypixel = packet_get_int();
788 debug("Window change received.");
789 packet_integrity_check(plen, 4 * 4, type);
791 pty_change_window_size(fdin, row, col, xpixel, ypixel);
795 server_request_direct_tcpip(char *ctype)
799 char *target, *originator;
800 int target_port, originator_port;
802 target = packet_get_string(NULL);
803 target_port = packet_get_int();
804 originator = packet_get_string(NULL);
805 originator_port = packet_get_int();
808 debug("server_request_direct_tcpip: originator %s port %d, target %s port %d",
809 originator, originator_port, target, target_port);
811 /* XXX check permission */
812 sock = channel_connect_to(target, target_port);
817 c = channel_new(ctype, SSH_CHANNEL_CONNECTING,
818 sock, sock, -1, CHAN_TCP_WINDOW_DEFAULT,
819 CHAN_TCP_PACKET_DEFAULT, 0, xstrdup("direct-tcpip"), 1);
821 error("server_request_direct_tcpip: channel_new failed");
828 server_request_session(char *ctype)
832 debug("input_session_request");
835 * A server session has no fd to read or write until a
836 * CHANNEL_REQUEST for a shell is made, so we set the type to
837 * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all
838 * CHANNEL_REQUEST messages is registered.
840 c = channel_new(ctype, SSH_CHANNEL_LARVAL,
841 -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT,
842 0, xstrdup("server-session"), 1);
844 error("server_request_session: channel_new failed");
847 if (session_open(xxx_authctxt, c->self) != 1) {
848 debug("session open failed, free channel %d", c->self);
852 channel_register_callback(c->self, SSH2_MSG_CHANNEL_REQUEST,
853 session_input_channel_req, (void *)0);
854 channel_register_cleanup(c->self, session_close_by_channel);
859 server_input_channel_open(int type, int plen, void *ctxt)
868 ctype = packet_get_string(&len);
869 rchan = packet_get_int();
870 rwindow = packet_get_int();
871 rmaxpack = packet_get_int();
873 debug("server_input_channel_open: ctype %s rchan %d win %d max %d",
874 ctype, rchan, rwindow, rmaxpack);
876 if (strcmp(ctype, "session") == 0) {
877 c = server_request_session(ctype);
878 } else if (strcmp(ctype, "direct-tcpip") == 0) {
879 c = server_request_direct_tcpip(ctype);
882 debug("server_input_channel_open: confirm %s", ctype);
883 c->remote_id = rchan;
884 c->remote_window = rwindow;
885 c->remote_maxpacket = rmaxpack;
886 if (c->type != SSH_CHANNEL_CONNECTING) {
887 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
888 packet_put_int(c->remote_id);
889 packet_put_int(c->self);
890 packet_put_int(c->local_window);
891 packet_put_int(c->local_maxpacket);
895 debug("server_input_channel_open: failure %s", ctype);
896 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
897 packet_put_int(rchan);
898 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
899 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
900 packet_put_cstring("open failed");
901 packet_put_cstring("");
909 server_input_global_request(int type, int plen, void *ctxt)
915 rtype = packet_get_string(NULL);
916 want_reply = packet_get_char();
917 debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply);
919 /* -R style forwarding */
920 if (strcmp(rtype, "tcpip-forward") == 0) {
922 char *listen_address;
925 pw = auth_get_user();
927 fatal("server_input_global_request: no user");
928 listen_address = packet_get_string(NULL); /* XXX currently ignored */
929 listen_port = (u_short)packet_get_int();
930 debug("server_input_global_request: tcpip-forward listen %s port %d",
931 listen_address, listen_port);
933 /* check permissions */
934 if (!options.allow_tcp_forwarding ||
935 no_port_forwarding_flag ||
936 (listen_port < IPPORT_RESERVED && pw->pw_uid != 0)) {
938 packet_send_debug("Server has disabled port forwarding.");
940 /* Start listening on the port */
941 success = channel_request_forwarding(
942 listen_address, listen_port,
943 /*unspec host_to_connect*/ "<unspec host>",
944 /*unspec port_to_connect*/ 0,
945 options.gateway_ports, /*remote*/ 1);
947 xfree(listen_address);
950 packet_start(success ?
951 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
959 server_init_dispatch_20(void)
961 debug("server_init_dispatch_20");
962 dispatch_init(&dispatch_protocol_error);
963 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
964 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
965 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
966 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
967 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open);
968 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
969 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
970 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request);
971 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
972 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request);
974 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_channel_failure);
976 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
979 server_init_dispatch_13(void)
981 debug("server_init_dispatch_13");
983 dispatch_set(SSH_CMSG_EOF, &server_input_eof);
984 dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data);
985 dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size);
986 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
987 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
988 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
989 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
990 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
991 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
994 server_init_dispatch_15(void)
996 server_init_dispatch_13();
997 debug("server_init_dispatch_15");
998 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
999 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose);
1002 server_init_dispatch(void)
1005 server_init_dispatch_20();
1007 server_init_dispatch_13();
1009 server_init_dispatch_15();