1 /* $OpenBSD: clientloop.c,v 1.188 2008/02/22 20:44:02 dtucker Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * The main loop for the interactive session (client side).
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".
15 * Copyright (c) 1999 Theo de Raadt. 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.
38 * SSH2 support added by Markus Friedl.
39 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
50 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
64 #include <sys/types.h>
65 #include <sys/ioctl.h>
66 #include <sys/param.h>
67 #ifdef HAVE_SYS_STAT_H
68 # include <sys/stat.h>
70 #ifdef HAVE_SYS_TIME_H
71 # include <sys/time.h>
73 #include <sys/socket.h>
102 #include "readconf.h"
103 #include "clientloop.h"
104 #include "sshconnect.h"
106 #include "atomicio.h"
109 #include "monitor_fdpass.h"
114 extern Options options
;
116 /* Flag indicating that stdin should be redirected from /dev/null. */
117 extern int stdin_null_flag
;
119 /* Flag indicating that no shell has been requested */
120 extern int no_shell_flag
;
123 extern int control_fd
;
126 * Name of the host we are connecting to. This is the name given on the
127 * command line, or the HostName specified for the user-supplied name in a
128 * configuration file.
133 * Flag to indicate that we have received a window change signal which has
134 * not yet been processed. This will cause a message indicating the new
135 * window size to be sent to the server a little later. This is volatile
136 * because this is updated in a signal handler.
138 static volatile sig_atomic_t received_window_change_signal
= 0;
139 static volatile sig_atomic_t received_signal
= 0;
141 /* Flag indicating whether the user's terminal is in non-blocking mode. */
142 static int in_non_blocking_mode
= 0;
144 /* Common data for the client loop code. */
145 static volatile sig_atomic_t quit_pending
; /* Set non-zero to quit the loop. */
146 static int escape_char
; /* Escape character. */
147 static int escape_pending
; /* Last character was the escape character */
148 static int last_was_cr
; /* Last character was a newline. */
149 static int exit_status
; /* Used to store the exit status of the command. */
150 static int stdin_eof
; /* EOF has been encountered on standard error. */
151 static Buffer stdin_buffer
; /* Buffer for stdin data. */
152 static Buffer stdout_buffer
; /* Buffer for stdout data. */
153 static Buffer stderr_buffer
; /* Buffer for stderr data. */
154 static u_long stdin_bytes
, stdout_bytes
, stderr_bytes
;
155 static u_int buffer_high
;/* Soft max buffer size. */
156 static int connection_in
; /* Connection to server (input). */
157 static int connection_out
; /* Connection to server (output). */
158 static int need_rekeying
; /* Set to non-zero if rekeying is requested. */
159 static int session_closed
= 0; /* In SSH2: login session closed. */
161 static void client_init_dispatch(void);
162 int session_ident
= -1;
178 void ssh_process_session2_setup(int, int, int, Buffer
*);
180 /* Restores stdin to blocking mode. */
183 leave_non_blocking(void)
185 if (in_non_blocking_mode
) {
186 unset_nonblock(fileno(stdin
));
187 in_non_blocking_mode
= 0;
191 /* Puts stdin terminal in non-blocking mode. */
194 enter_non_blocking(void)
196 in_non_blocking_mode
= 1;
197 set_nonblock(fileno(stdin
));
201 * Signal handler for the window change signal (SIGWINCH). This just sets a
202 * flag indicating that the window has changed.
206 window_change_handler(int sig
)
208 received_window_change_signal
= 1;
209 signal(SIGWINCH
, window_change_handler
);
213 * Signal handler for signals that cause the program to terminate. These
214 * signals must be trapped to restore terminal modes.
218 signal_handler(int sig
)
220 received_signal
= sig
;
225 * Returns current time in seconds from Jan 1, 1970 with the maximum
226 * available resolution.
230 get_current_time(void)
233 gettimeofday(&tv
, NULL
);
234 return (double) tv
.tv_sec
+ (double) tv
.tv_usec
/ 1000000.0;
237 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
239 client_x11_get_proto(const char *display
, const char *xauth_path
,
240 u_int trusted
, char **_proto
, char **_data
)
245 static char proto
[512], data
[512];
247 int got_data
= 0, generated
= 0, do_unlink
= 0, i
;
248 char *xauthdir
, *xauthfile
;
251 xauthdir
= xauthfile
= NULL
;
254 proto
[0] = data
[0] = '\0';
256 if (xauth_path
== NULL
||(stat(xauth_path
, &st
) == -1)) {
257 debug("No xauth program.");
259 if (display
== NULL
) {
260 debug("x11_get_proto: DISPLAY not set");
264 * Handle FamilyLocal case where $DISPLAY does
265 * not match an authorization entry. For this we
266 * just try "xauth list unix:displaynum.screennum".
267 * XXX: "localhost" match to determine FamilyLocal
270 if (strncmp(display
, "localhost:", 10) == 0) {
271 snprintf(xdisplay
, sizeof(xdisplay
), "unix:%s",
276 xauthdir
= xmalloc(MAXPATHLEN
);
277 xauthfile
= xmalloc(MAXPATHLEN
);
278 strlcpy(xauthdir
, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN
);
279 if (mkdtemp(xauthdir
) != NULL
) {
281 snprintf(xauthfile
, MAXPATHLEN
, "%s/xauthfile",
283 snprintf(cmd
, sizeof(cmd
),
284 "%s -f %s generate %s " SSH_X11_PROTO
285 " untrusted timeout 1200 2>" _PATH_DEVNULL
,
286 xauth_path
, xauthfile
, display
);
287 debug2("x11_get_proto: %s", cmd
);
288 if (system(cmd
) == 0)
294 * When in untrusted mode, we read the cookie only if it was
295 * successfully generated as an untrusted one in the step
298 if (trusted
|| generated
) {
299 snprintf(cmd
, sizeof(cmd
),
300 "%s %s%s list %s 2>" _PATH_DEVNULL
,
302 generated
? "-f " : "" ,
303 generated
? xauthfile
: "",
305 debug2("x11_get_proto: %s", cmd
);
307 if (f
&& fgets(line
, sizeof(line
), f
) &&
308 sscanf(line
, "%*s %511s %511s", proto
, data
) == 2)
313 error("Warning: untrusted X11 forwarding setup failed: "
314 "xauth key data not generated");
327 * If we didn't get authentication data, just make up some
328 * data. The forwarding code will check the validity of the
329 * response anyway, and substitute this data. The X11
330 * server, however, will ignore this fake data and use
331 * whatever authentication mechanisms it was using otherwise
332 * for the local connection.
337 logit("Warning: No xauth data; "
338 "using fake authentication data for X11 forwarding.");
339 strlcpy(proto
, SSH_X11_PROTO
, sizeof proto
);
340 for (i
= 0; i
< 16; i
++) {
343 snprintf(data
+ 2 * i
, sizeof data
- 2 * i
, "%02x",
351 * This is called when the interactive is entered. This checks if there is
352 * an EOF coming on stdin. We must check this explicitly, as select() does
353 * not appear to wake up when redirecting from /dev/null.
357 client_check_initial_eof_on_stdin(void)
363 * If standard input is to be "redirected from /dev/null", we simply
364 * mark that we have seen an EOF and send an EOF message to the
365 * server. Otherwise, we try to read a single character; it appears
366 * that for some files, such /dev/null, select() never wakes up for
367 * read for this descriptor, which means that we never get EOF. This
368 * way we will get the EOF if stdin comes from /dev/null or similar.
370 if (stdin_null_flag
) {
371 /* Fake EOF on stdin. */
372 debug("Sending eof.");
374 packet_start(SSH_CMSG_EOF
);
377 enter_non_blocking();
379 /* Check for immediate EOF on stdin. */
380 len
= read(fileno(stdin
), buf
, 1);
382 /* EOF. Record that we have seen it and send EOF to server. */
383 debug("Sending eof.");
385 packet_start(SSH_CMSG_EOF
);
387 } else if (len
> 0) {
389 * Got data. We must store the data in the buffer,
390 * and also process it as an escape character if
393 if ((u_char
) buf
[0] == escape_char
)
396 buffer_append(&stdin_buffer
, buf
, 1);
398 leave_non_blocking();
404 * Make packets from buffered stdin data, and buffer them for sending to the
409 client_make_packets_from_stdin_data(void)
413 /* Send buffered stdin data to the server. */
414 while (buffer_len(&stdin_buffer
) > 0 &&
415 packet_not_very_much_data_to_write()) {
416 len
= buffer_len(&stdin_buffer
);
417 /* Keep the packets at reasonable size. */
418 if (len
> packet_get_maxsize())
419 len
= packet_get_maxsize();
420 packet_start(SSH_CMSG_STDIN_DATA
);
421 packet_put_string(buffer_ptr(&stdin_buffer
), len
);
423 buffer_consume(&stdin_buffer
, len
);
425 /* If we have a pending EOF, send it now. */
426 if (stdin_eof
&& buffer_len(&stdin_buffer
) == 0) {
427 packet_start(SSH_CMSG_EOF
);
434 * Checks if the client window has changed, and sends a packet about it to
435 * the server if so. The actual change is detected elsewhere (by a software
436 * interrupt on Unix); this just checks the flag and sends a message if
441 client_check_window_change(void)
445 if (! received_window_change_signal
)
448 received_window_change_signal
= 0;
450 debug2("client_check_window_change: changed");
453 channel_send_window_changes();
455 if (ioctl(fileno(stdin
), TIOCGWINSZ
, &ws
) < 0)
457 packet_start(SSH_CMSG_WINDOW_SIZE
);
458 packet_put_int((u_int
)ws
.ws_row
);
459 packet_put_int((u_int
)ws
.ws_col
);
460 packet_put_int((u_int
)ws
.ws_xpixel
);
461 packet_put_int((u_int
)ws
.ws_ypixel
);
467 client_global_request_reply(int type
, u_int32_t seq
, void *ctxt
)
469 keep_alive_timeouts
= 0;
470 client_global_request_reply_fwd(type
, seq
, ctxt
);
474 server_alive_check(void)
476 if (++keep_alive_timeouts
> options
.server_alive_count_max
) {
477 logit("Timeout, server not responding.");
480 packet_start(SSH2_MSG_GLOBAL_REQUEST
);
481 packet_put_cstring("keepalive@openssh.com");
482 packet_put_char(1); /* boolean: want reply */
487 * Waits until the client can do something (some data becomes available on
488 * one of the file descriptors).
491 client_wait_until_can_do_something(fd_set
**readsetp
, fd_set
**writesetp
,
492 int *maxfdp
, u_int
*nallocp
, int rekeying
)
494 struct timeval tv
, *tvp
;
497 /* Add any selections by the channel mechanism. */
498 channel_prepare_select(readsetp
, writesetp
, maxfdp
, nallocp
, rekeying
);
501 /* Read from the connection, unless our buffers are full. */
502 if (buffer_len(&stdout_buffer
) < buffer_high
&&
503 buffer_len(&stderr_buffer
) < buffer_high
&&
504 channel_not_very_much_buffered_data())
505 FD_SET(connection_in
, *readsetp
);
507 * Read from stdin, unless we have seen EOF or have very much
508 * buffered data to send to the server.
510 if (!stdin_eof
&& packet_not_very_much_data_to_write())
511 FD_SET(fileno(stdin
), *readsetp
);
513 /* Select stdout/stderr if have data in buffer. */
514 if (buffer_len(&stdout_buffer
) > 0)
515 FD_SET(fileno(stdout
), *writesetp
);
516 if (buffer_len(&stderr_buffer
) > 0)
517 FD_SET(fileno(stderr
), *writesetp
);
519 /* channel_prepare_select could have closed the last channel */
520 if (session_closed
&& !channel_still_open() &&
521 !packet_have_data_to_write()) {
522 /* clear mask since we did not call select() */
523 memset(*readsetp
, 0, *nallocp
);
524 memset(*writesetp
, 0, *nallocp
);
527 FD_SET(connection_in
, *readsetp
);
531 /* Select server connection if have data to write to the server. */
532 if (packet_have_data_to_write())
533 FD_SET(connection_out
, *writesetp
);
535 if (control_fd
!= -1)
536 FD_SET(control_fd
, *readsetp
);
539 * Wait for something to happen. This will suspend the process until
540 * some selected descriptor can be read, written, or has some other
544 if (options
.server_alive_interval
== 0 || !compat20
)
547 tv
.tv_sec
= options
.server_alive_interval
;
551 ret
= select((*maxfdp
)+1, *readsetp
, *writesetp
, NULL
, tvp
);
556 * We have to clear the select masks, because we return.
557 * We have to return, because the mainloop checks for the flags
558 * set by the signal handlers.
560 memset(*readsetp
, 0, *nallocp
);
561 memset(*writesetp
, 0, *nallocp
);
565 /* Note: we might still have data in the buffers. */
566 snprintf(buf
, sizeof buf
, "select: %s\r\n", strerror(errno
));
567 buffer_append(&stderr_buffer
, buf
, strlen(buf
));
570 server_alive_check();
574 client_suspend_self(Buffer
*bin
, Buffer
*bout
, Buffer
*berr
)
576 /* Flush stdout and stderr buffers. */
577 if (buffer_len(bout
) > 0)
578 atomicio(vwrite
, fileno(stdout
), buffer_ptr(bout
), buffer_len(bout
));
579 if (buffer_len(berr
) > 0)
580 atomicio(vwrite
, fileno(stderr
), buffer_ptr(berr
), buffer_len(berr
));
585 * Free (and clear) the buffer to reduce the amount of data that gets
592 /* Send the suspend signal to the program itself. */
593 kill(getpid(), SIGTSTP
);
595 /* Reset window sizes in case they have changed */
596 received_window_change_signal
= 1;
598 /* OK, we have been continued by the user. Reinitialize buffers. */
607 client_process_net_input(fd_set
*readset
)
613 * Read input from the server, and add any such data to the buffer of
614 * the packet subsystem.
616 if (FD_ISSET(connection_in
, readset
)) {
617 /* Read as much as possible. */
618 len
= read(connection_in
, buf
, sizeof(buf
));
620 /* Received EOF. The remote host has closed the connection. */
621 snprintf(buf
, sizeof buf
, "Connection to %.300s closed by remote host.\r\n",
623 buffer_append(&stderr_buffer
, buf
, strlen(buf
));
628 * There is a kernel bug on Solaris that causes select to
629 * sometimes wake up even though there is no data available.
631 if (len
< 0 && (errno
== EAGAIN
|| errno
== EINTR
))
635 /* An error has encountered. Perhaps there is a network problem. */
636 snprintf(buf
, sizeof buf
, "Read from remote host %.300s: %.100s\r\n",
637 host
, strerror(errno
));
638 buffer_append(&stderr_buffer
, buf
, strlen(buf
));
642 packet_process_incoming(buf
, len
);
647 client_subsystem_reply(int type
, u_int32_t seq
, void *ctxt
)
652 id
= packet_get_int();
655 if ((c
= channel_lookup(id
)) == NULL
) {
656 error("%s: no channel for id %d", __func__
, id
);
660 if (type
== SSH2_MSG_CHANNEL_SUCCESS
)
661 debug2("Request suceeded on channel %d", id
);
662 else if (type
== SSH2_MSG_CHANNEL_FAILURE
) {
663 error("Request failed on channel %d", id
);
669 client_extra_session2_setup(int id
, void *arg
)
671 struct confirm_ctx
*cctx
= arg
;
677 fatal("%s: cctx == NULL", __func__
);
678 if ((c
= channel_lookup(id
)) == NULL
)
679 fatal("%s: no channel for id %d", __func__
, id
);
681 display
= getenv("DISPLAY");
682 if (cctx
->want_x_fwd
&& options
.forward_x11
&& display
!= NULL
) {
684 /* Get reasonable local authentication information. */
685 client_x11_get_proto(display
, options
.xauth_location
,
686 options
.forward_x11_trusted
, &proto
, &data
);
687 /* Request forwarding with authentication spoofing. */
688 debug("Requesting X11 forwarding with authentication spoofing.");
689 x11_request_forwarding_with_spoofing(id
, display
, proto
, data
);
690 /* XXX wait for reply */
693 if (cctx
->want_agent_fwd
&& options
.forward_agent
) {
694 debug("Requesting authentication agent forwarding.");
695 channel_request_start(id
, "auth-agent-req@openssh.com", 0);
699 client_session2_setup(id
, cctx
->want_tty
, cctx
->want_subsys
,
700 cctx
->term
, &cctx
->tio
, c
->rfd
, &cctx
->cmd
, cctx
->env
,
701 client_subsystem_reply
);
703 c
->confirm_ctx
= NULL
;
704 buffer_free(&cctx
->cmd
);
706 if (cctx
->env
!= NULL
) {
707 for (i
= 0; cctx
->env
[i
] != NULL
; i
++)
715 client_process_control(fd_set
*readset
)
719 int client_fd
, new_fd
[3], ver
, allowed
, window
, packetmax
;
721 struct sockaddr_storage addr
;
722 struct confirm_ctx
*cctx
;
724 u_int i
, j
, len
, env_len
, command
, flags
;
729 * Accept connection on control socket
731 if (control_fd
== -1 || !FD_ISSET(control_fd
, readset
))
734 memset(&addr
, 0, sizeof(addr
));
735 addrlen
= sizeof(addr
);
736 if ((client_fd
= accept(control_fd
,
737 (struct sockaddr
*)&addr
, &addrlen
)) == -1) {
738 error("%s accept: %s", __func__
, strerror(errno
));
742 if (getpeereid(client_fd
, &euid
, &egid
) < 0) {
743 error("%s getpeereid failed: %s", __func__
, strerror(errno
));
747 if ((euid
!= 0) && (getuid() != euid
)) {
748 error("control mode uid mismatch: peer euid %u != uid %u",
749 (u_int
) euid
, (u_int
) getuid());
754 unset_nonblock(client_fd
);
758 if (ssh_msg_recv(client_fd
, &m
) == -1) {
759 error("%s: client msg_recv failed", __func__
);
764 if ((ver
= buffer_get_char(&m
)) != SSHMUX_VER
) {
765 error("%s: wrong client version %d", __func__
, ver
);
772 command
= buffer_get_int(&m
);
773 flags
= buffer_get_int(&m
);
778 case SSHMUX_COMMAND_OPEN
:
779 if (options
.control_master
== SSHCTL_MASTER_ASK
||
780 options
.control_master
== SSHCTL_MASTER_AUTO_ASK
)
781 allowed
= ask_permission("Allow shared connection "
785 case SSHMUX_COMMAND_TERMINATE
:
786 if (options
.control_master
== SSHCTL_MASTER_ASK
||
787 options
.control_master
== SSHCTL_MASTER_AUTO_ASK
)
788 allowed
= ask_permission("Terminate shared connection "
793 case SSHMUX_COMMAND_ALIVE_CHECK
:
794 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
796 buffer_put_int(&m
, allowed
);
797 buffer_put_int(&m
, getpid());
798 if (ssh_msg_send(client_fd
, SSHMUX_VER
, &m
) == -1) {
799 error("%s: client msg_send failed", __func__
);
808 error("Unsupported command %d", command
);
814 /* Reply for SSHMUX_COMMAND_OPEN */
816 buffer_put_int(&m
, allowed
);
817 buffer_put_int(&m
, getpid());
818 if (ssh_msg_send(client_fd
, SSHMUX_VER
, &m
) == -1) {
819 error("%s: client msg_send failed", __func__
);
826 error("Refused control connection");
833 if (ssh_msg_recv(client_fd
, &m
) == -1) {
834 error("%s: client msg_recv failed", __func__
);
839 if ((ver
= buffer_get_char(&m
)) != SSHMUX_VER
) {
840 error("%s: wrong client version %d", __func__
, ver
);
846 cctx
= xcalloc(1, sizeof(*cctx
));
847 cctx
->want_tty
= (flags
& SSHMUX_FLAG_TTY
) != 0;
848 cctx
->want_subsys
= (flags
& SSHMUX_FLAG_SUBSYS
) != 0;
849 cctx
->want_x_fwd
= (flags
& SSHMUX_FLAG_X11_FWD
) != 0;
850 cctx
->want_agent_fwd
= (flags
& SSHMUX_FLAG_AGENT_FWD
) != 0;
851 cctx
->term
= buffer_get_string(&m
, &len
);
853 cmd
= buffer_get_string(&m
, &len
);
854 buffer_init(&cctx
->cmd
);
855 buffer_append(&cctx
->cmd
, cmd
, strlen(cmd
));
857 env_len
= buffer_get_int(&m
);
858 env_len
= MIN(env_len
, 4096);
859 debug3("%s: receiving %d env vars", __func__
, env_len
);
861 cctx
->env
= xcalloc(env_len
+ 1, sizeof(*cctx
->env
));
862 for (i
= 0; i
< env_len
; i
++)
863 cctx
->env
[i
] = buffer_get_string(&m
, &len
);
867 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__
,
868 cctx
->want_tty
, cctx
->want_subsys
, cmd
);
871 /* Gather fds from client */
872 for(i
= 0; i
< 3; i
++) {
873 if ((new_fd
[i
] = mm_receive_fd(client_fd
)) == -1) {
874 error("%s: failed to receive fd %d from slave",
876 for (j
= 0; j
< i
; j
++)
878 for (j
= 0; j
< env_len
; j
++)
883 buffer_free(&cctx
->cmd
);
890 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__
,
891 new_fd
[0], new_fd
[1], new_fd
[2]);
893 /* Try to pick up ttymodes from client before it goes raw */
894 if (cctx
->want_tty
&& tcgetattr(new_fd
[0], &cctx
->tio
) == -1)
895 error("%s: tcgetattr: %s", __func__
, strerror(errno
));
897 /* This roundtrip is just for synchronisation of ttymodes */
899 if (ssh_msg_send(client_fd
, SSHMUX_VER
, &m
) == -1) {
900 error("%s: client msg_send failed", __func__
);
908 for (i
= 0; i
< env_len
; i
++)
916 /* enable nonblocking unless tty */
917 if (!isatty(new_fd
[0]))
918 set_nonblock(new_fd
[0]);
919 if (!isatty(new_fd
[1]))
920 set_nonblock(new_fd
[1]);
921 if (!isatty(new_fd
[2]))
922 set_nonblock(new_fd
[2]);
924 set_nonblock(client_fd
);
926 window
= CHAN_SES_WINDOW_DEFAULT
;
927 packetmax
= CHAN_SES_PACKET_DEFAULT
;
928 if (cctx
->want_tty
) {
933 c
= channel_new("session", SSH_CHANNEL_OPENING
,
934 new_fd
[0], new_fd
[1], new_fd
[2], window
, packetmax
,
935 CHAN_EXTENDED_WRITE
, "client-session", /*nonblock*/0);
938 c
->ctl_fd
= client_fd
;
940 debug3("%s: channel_new: %d", __func__
, c
->self
);
942 channel_send_open(c
->self
);
943 channel_register_confirm(c
->self
, client_extra_session2_setup
, cctx
);
947 process_cmdline(void)
949 void (*handler
)(int);
950 char *s
, *cmd
, *cancel_host
;
956 bzero(&fwd
, sizeof(fwd
));
957 fwd
.listen_host
= fwd
.connect_host
= NULL
;
960 handler
= signal(SIGINT
, SIG_IGN
);
961 cmd
= s
= read_passphrase("\r\nssh> ", RP_ECHO
);
967 s
++; /* Skip cmdline '-', if any */
971 if (*s
== 'h' || *s
== 'H' || *s
== '?') {
973 logit(" -L[bind_address:]port:host:hostport "
974 "Request local forward");
975 logit(" -R[bind_address:]port:host:hostport "
976 "Request remote forward");
977 logit(" -KR[bind_address:]port "
978 "Cancel remote forward");
979 if (!options
.permit_local_command
)
982 "Execute local command");
986 if (*s
== '!' && options
.permit_local_command
) {
996 if (*s
!= 'L' && *s
!= 'R') {
997 logit("Invalid command.");
1002 if (local
&& delete) {
1003 logit("Not supported.");
1006 if ((!local
|| delete) && !compat20
) {
1007 logit("Not supported for SSH protocol version 1.");
1011 while (isspace(*++s
))
1016 cancel_host
= hpdelim(&s
); /* may be NULL */
1018 cancel_port
= a2port(s
);
1019 cancel_host
= cleanhostname(cancel_host
);
1021 cancel_port
= a2port(cancel_host
);
1024 if (cancel_port
== 0) {
1025 logit("Bad forwarding close port");
1028 channel_request_rforward_cancel(cancel_host
, cancel_port
);
1030 if (!parse_forward(&fwd
, s
)) {
1031 logit("Bad forwarding specification.");
1035 if (channel_setup_local_fwd_listener(fwd
.listen_host
,
1036 fwd
.listen_port
, fwd
.connect_host
,
1037 fwd
.connect_port
, options
.gateway_ports
) < 0) {
1038 logit("Port forwarding failed.");
1042 if (channel_request_remote_forwarding(fwd
.listen_host
,
1043 fwd
.listen_port
, fwd
.connect_host
,
1044 fwd
.connect_port
) < 0) {
1045 logit("Port forwarding failed.");
1050 logit("Forwarding port.");
1054 signal(SIGINT
, handler
);
1058 if (fwd
.listen_host
!= NULL
)
1059 xfree(fwd
.listen_host
);
1060 if (fwd
.connect_host
!= NULL
)
1061 xfree(fwd
.connect_host
);
1064 /* process the characters one by one */
1066 process_escapes(Buffer
*bin
, Buffer
*bout
, Buffer
*berr
, char *buf
, int len
)
1078 for (i
= 0; i
< (u_int
)len
; i
++) {
1079 /* Get one character at a time. */
1082 if (escape_pending
) {
1083 /* We have previously seen an escape character. */
1084 /* Clear the flag now. */
1087 /* Process the escaped character. */
1090 /* Terminate the connection. */
1091 snprintf(string
, sizeof string
, "%c.\r\n", escape_char
);
1092 buffer_append(berr
, string
, strlen(string
));
1098 /* Suspend the program. */
1099 /* Print a message to that effect to the user. */
1100 snprintf(string
, sizeof string
, "%c^Z [suspend ssh]\r\n", escape_char
);
1101 buffer_append(berr
, string
, strlen(string
));
1103 /* Restore terminal modes and suspend. */
1104 client_suspend_self(bin
, bout
, berr
);
1106 /* We have been continued. */
1111 snprintf(string
, sizeof string
,
1112 "%cB\r\n", escape_char
);
1113 buffer_append(berr
, string
,
1115 channel_request_start(session_ident
,
1117 packet_put_int(1000);
1124 if (datafellows
& SSH_BUG_NOREKEY
)
1125 logit("Server does not support re-keying");
1133 * Detach the program (continue to serve connections,
1134 * but put in background and no more new connections).
1136 /* Restore tty modes. */
1139 /* Stop listening for new connections. */
1140 channel_stop_listening();
1142 snprintf(string
, sizeof string
,
1143 "%c& [backgrounded]\n", escape_char
);
1144 buffer_append(berr
, string
, strlen(string
));
1146 /* Fork into background. */
1149 error("fork: %.100s", strerror(errno
));
1152 if (pid
!= 0) { /* This is the parent. */
1153 /* The parent just exits. */
1156 /* The child continues serving connections. */
1158 buffer_append(bin
, "\004", 1);
1159 /* fake EOF on stdin */
1161 } else if (!stdin_eof
) {
1163 * Sending SSH_CMSG_EOF alone does not always appear
1164 * to be enough. So we try to send an EOF character
1167 packet_start(SSH_CMSG_STDIN_DATA
);
1168 packet_put_string("\004", 1);
1172 if (buffer_len(bin
) == 0) {
1173 packet_start(SSH_CMSG_EOF
);
1180 snprintf(string
, sizeof string
,
1182 Supported escape sequences:\r\n\
1183 %c. - terminate connection\r\n\
1184 %cB - send a BREAK to the remote system\r\n\
1185 %cC - open a command line\r\n\
1186 %cR - Request rekey (SSH protocol 2 only)\r\n\
1187 %c^Z - suspend ssh\r\n\
1188 %c# - list forwarded connections\r\n\
1189 %c& - background ssh (when waiting for connections to terminate)\r\n\
1190 %c? - this message\r\n\
1191 %c%c - send the escape character by typing it twice\r\n\
1192 (Note that escapes are only recognized immediately after newline.)\r\n",
1193 escape_char
, escape_char
, escape_char
, escape_char
,
1194 escape_char
, escape_char
, escape_char
, escape_char
,
1195 escape_char
, escape_char
, escape_char
);
1196 buffer_append(berr
, string
, strlen(string
));
1200 snprintf(string
, sizeof string
, "%c#\r\n", escape_char
);
1201 buffer_append(berr
, string
, strlen(string
));
1202 s
= channel_open_message();
1203 buffer_append(berr
, s
, strlen(s
));
1212 if (ch
!= escape_char
) {
1213 buffer_put_char(bin
, escape_char
);
1216 /* Escaped characters fall through here */
1221 * The previous character was not an escape char. Check if this
1224 if (last_was_cr
&& ch
== escape_char
) {
1225 /* It is. Set the flag and continue to next character. */
1232 * Normal character. Record whether it was a newline,
1233 * and append it to the buffer.
1235 last_was_cr
= (ch
== '\r' || ch
== '\n');
1236 buffer_put_char(bin
, ch
);
1243 client_process_input(fd_set
*readset
)
1248 /* Read input from stdin. */
1249 if (FD_ISSET(fileno(stdin
), readset
)) {
1250 /* Read as much as possible. */
1251 len
= read(fileno(stdin
), buf
, sizeof(buf
));
1252 if (len
< 0 && (errno
== EAGAIN
|| errno
== EINTR
))
1253 return; /* we'll try again later */
1256 * Received EOF or error. They are treated
1257 * similarly, except that an error message is printed
1258 * if it was an error condition.
1261 snprintf(buf
, sizeof buf
, "read: %.100s\r\n", strerror(errno
));
1262 buffer_append(&stderr_buffer
, buf
, strlen(buf
));
1264 /* Mark that we have seen EOF. */
1267 * Send an EOF message to the server unless there is
1268 * data in the buffer. If there is data in the
1269 * buffer, no message will be sent now. Code
1270 * elsewhere will send the EOF when the buffer
1271 * becomes empty if stdin_eof is set.
1273 if (buffer_len(&stdin_buffer
) == 0) {
1274 packet_start(SSH_CMSG_EOF
);
1277 } else if (escape_char
== SSH_ESCAPECHAR_NONE
) {
1279 * Normal successful read, and no escape character.
1280 * Just append the data to buffer.
1282 buffer_append(&stdin_buffer
, buf
, len
);
1285 * Normal, successful read. But we have an escape character
1286 * and have to process the characters one by one.
1288 if (process_escapes(&stdin_buffer
, &stdout_buffer
,
1289 &stderr_buffer
, buf
, len
) == -1)
1296 client_process_output(fd_set
*writeset
)
1301 /* Write buffered output to stdout. */
1302 if (FD_ISSET(fileno(stdout
), writeset
)) {
1303 /* Write as much data as possible. */
1304 len
= write(fileno(stdout
), buffer_ptr(&stdout_buffer
),
1305 buffer_len(&stdout_buffer
));
1307 if (errno
== EINTR
|| errno
== EAGAIN
)
1311 * An error or EOF was encountered. Put an
1312 * error message to stderr buffer.
1314 snprintf(buf
, sizeof buf
, "write stdout: %.50s\r\n", strerror(errno
));
1315 buffer_append(&stderr_buffer
, buf
, strlen(buf
));
1320 /* Consume printed data from the buffer. */
1321 buffer_consume(&stdout_buffer
, len
);
1322 stdout_bytes
+= len
;
1324 /* Write buffered output to stderr. */
1325 if (FD_ISSET(fileno(stderr
), writeset
)) {
1326 /* Write as much data as possible. */
1327 len
= write(fileno(stderr
), buffer_ptr(&stderr_buffer
),
1328 buffer_len(&stderr_buffer
));
1330 if (errno
== EINTR
|| errno
== EAGAIN
)
1333 /* EOF or error, but can't even print error message. */
1338 /* Consume printed characters from the buffer. */
1339 buffer_consume(&stderr_buffer
, len
);
1340 stderr_bytes
+= len
;
1345 * Get packets from the connection input buffer, and process them as long as
1346 * there are packets available.
1348 * Any unknown packets received during the actual
1349 * session cause the session to terminate. This is
1350 * intended to make debugging easier since no
1351 * confirmations are sent. Any compatible protocol
1352 * extensions must be negotiated during the
1353 * preparatory phase.
1357 client_process_buffered_input_packets(void)
1359 dispatch_run(DISPATCH_NONBLOCK
, &quit_pending
, compat20
? xxx_kex
: NULL
);
1362 /* scan buf[] for '~' before sending data to the peer */
1365 simple_escape_filter(Channel
*c
, char *buf
, int len
)
1367 /* XXX we assume c->extended is writeable */
1368 return process_escapes(&c
->input
, &c
->output
, &c
->extended
, buf
, len
);
1372 client_channel_closed(int id
, void *arg
)
1374 channel_cancel_cleanup(id
);
1380 * Implements the interactive session with the server. This is called after
1381 * the user has been authenticated, and a command has been started on the
1382 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1383 * used as an escape character for terminating or suspending the session.
1387 client_loop(int have_pty
, int escape_char_arg
, int ssh2_chan_id
)
1389 fd_set
*readset
= NULL
, *writeset
= NULL
;
1390 double start_time
, total_time
;
1391 int max_fd
= 0, max_fd2
= 0, len
, rekeying
= 0;
1395 debug("Entering interactive session.");
1397 start_time
= get_current_time();
1399 /* Initialize variables. */
1404 buffer_high
= 64 * 1024;
1405 connection_in
= packet_get_connection_in();
1406 connection_out
= packet_get_connection_out();
1407 max_fd
= MAX(connection_in
, connection_out
);
1408 if (control_fd
!= -1)
1409 max_fd
= MAX(max_fd
, control_fd
);
1412 /* enable nonblocking unless tty */
1413 if (!isatty(fileno(stdin
)))
1414 set_nonblock(fileno(stdin
));
1415 if (!isatty(fileno(stdout
)))
1416 set_nonblock(fileno(stdout
));
1417 if (!isatty(fileno(stderr
)))
1418 set_nonblock(fileno(stderr
));
1419 max_fd
= MAX(max_fd
, fileno(stdin
));
1420 max_fd
= MAX(max_fd
, fileno(stdout
));
1421 max_fd
= MAX(max_fd
, fileno(stderr
));
1427 escape_char
= escape_char_arg
;
1429 /* Initialize buffers. */
1430 buffer_init(&stdin_buffer
);
1431 buffer_init(&stdout_buffer
);
1432 buffer_init(&stderr_buffer
);
1434 client_init_dispatch();
1437 * Set signal handlers, (e.g. to restore non-blocking mode)
1438 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1440 if (signal(SIGHUP
, SIG_IGN
) != SIG_IGN
)
1441 signal(SIGHUP
, signal_handler
);
1442 if (signal(SIGINT
, SIG_IGN
) != SIG_IGN
)
1443 signal(SIGINT
, signal_handler
);
1444 if (signal(SIGQUIT
, SIG_IGN
) != SIG_IGN
)
1445 signal(SIGQUIT
, signal_handler
);
1446 if (signal(SIGTERM
, SIG_IGN
) != SIG_IGN
)
1447 signal(SIGTERM
, signal_handler
);
1448 signal(SIGWINCH
, window_change_handler
);
1454 session_ident
= ssh2_chan_id
;
1455 if (escape_char
!= SSH_ESCAPECHAR_NONE
)
1456 channel_register_filter(session_ident
,
1457 simple_escape_filter
, NULL
);
1458 if (session_ident
!= -1)
1459 channel_register_cleanup(session_ident
,
1460 client_channel_closed
, 0);
1462 /* Check if we should immediately send eof on stdin. */
1463 client_check_initial_eof_on_stdin();
1466 /* Main loop of the client for the interactive session mode. */
1467 while (!quit_pending
) {
1469 /* Process buffered packets sent by the server. */
1470 client_process_buffered_input_packets();
1472 if (compat20
&& session_closed
&& !channel_still_open())
1475 rekeying
= (xxx_kex
!= NULL
&& !xxx_kex
->done
);
1478 debug("rekeying in progress");
1481 * Make packets of buffered stdin data, and buffer
1482 * them for sending to the server.
1485 client_make_packets_from_stdin_data();
1488 * Make packets from buffered channel data, and
1489 * enqueue them for sending to the server.
1491 if (packet_not_very_much_data_to_write())
1492 channel_output_poll();
1495 * Check if the window size has changed, and buffer a
1496 * message about it to the server if so.
1498 client_check_window_change();
1504 * Wait until we have something to do (something becomes
1505 * available on one of the descriptors).
1508 client_wait_until_can_do_something(&readset
, &writeset
,
1509 &max_fd2
, &nalloc
, rekeying
);
1514 /* Do channel operations unless rekeying in progress. */
1516 channel_after_select(readset
, writeset
);
1517 if (need_rekeying
|| packet_need_rekeying()) {
1518 debug("need rekeying");
1520 kex_send_kexinit(xxx_kex
);
1525 /* Buffer input from the connection. */
1526 client_process_net_input(readset
);
1528 /* Accept control connections. */
1529 client_process_control(readset
);
1535 /* Buffer data from stdin */
1536 client_process_input(readset
);
1538 * Process output to stdout and stderr. Output to
1539 * the connection is processed elsewhere (above).
1541 client_process_output(writeset
);
1544 /* Send as much buffered packet data as possible to the sender. */
1545 if (FD_ISSET(connection_out
, writeset
))
1546 packet_write_poll();
1553 /* Terminate the session. */
1555 /* Stop watching for window change. */
1556 signal(SIGWINCH
, SIG_DFL
);
1563 /* restore blocking io */
1564 if (!isatty(fileno(stdin
)))
1565 unset_nonblock(fileno(stdin
));
1566 if (!isatty(fileno(stdout
)))
1567 unset_nonblock(fileno(stdout
));
1568 if (!isatty(fileno(stderr
)))
1569 unset_nonblock(fileno(stderr
));
1572 * If there was no shell or command requested, there will be no remote
1573 * exit status to be returned. In that case, clear error code if the
1574 * connection was deliberately terminated at this end.
1576 if (no_shell_flag
&& received_signal
== SIGTERM
) {
1577 received_signal
= 0;
1581 if (received_signal
)
1582 fatal("Killed by signal %d.", (int) received_signal
);
1585 * In interactive mode (with pseudo tty) display a message indicating
1586 * that the connection has been closed.
1588 if (have_pty
&& options
.log_level
!= SYSLOG_LEVEL_QUIET
) {
1589 snprintf(buf
, sizeof buf
, "Connection to %.64s closed.\r\n", host
);
1590 buffer_append(&stderr_buffer
, buf
, strlen(buf
));
1593 /* Output any buffered data for stdout. */
1594 while (buffer_len(&stdout_buffer
) > 0) {
1595 len
= write(fileno(stdout
), buffer_ptr(&stdout_buffer
),
1596 buffer_len(&stdout_buffer
));
1598 error("Write failed flushing stdout buffer.");
1601 buffer_consume(&stdout_buffer
, len
);
1602 stdout_bytes
+= len
;
1605 /* Output any buffered data for stderr. */
1606 while (buffer_len(&stderr_buffer
) > 0) {
1607 len
= write(fileno(stderr
), buffer_ptr(&stderr_buffer
),
1608 buffer_len(&stderr_buffer
));
1610 error("Write failed flushing stderr buffer.");
1613 buffer_consume(&stderr_buffer
, len
);
1614 stderr_bytes
+= len
;
1617 /* Clear and free any buffers. */
1618 memset(buf
, 0, sizeof(buf
));
1619 buffer_free(&stdin_buffer
);
1620 buffer_free(&stdout_buffer
);
1621 buffer_free(&stderr_buffer
);
1623 /* Report bytes transferred, and transfer rates. */
1624 total_time
= get_current_time() - start_time
;
1625 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1626 stdin_bytes
, stdout_bytes
, stderr_bytes
, total_time
);
1628 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1629 stdin_bytes
/ total_time
, stdout_bytes
/ total_time
,
1630 stderr_bytes
/ total_time
);
1632 /* Return the exit status of the program. */
1633 debug("Exit status %d", exit_status
);
1640 client_input_stdout_data(int type
, u_int32_t seq
, void *ctxt
)
1643 char *data
= packet_get_string(&data_len
);
1645 buffer_append(&stdout_buffer
, data
, data_len
);
1646 memset(data
, 0, data_len
);
1650 client_input_stderr_data(int type
, u_int32_t seq
, void *ctxt
)
1653 char *data
= packet_get_string(&data_len
);
1655 buffer_append(&stderr_buffer
, data
, data_len
);
1656 memset(data
, 0, data_len
);
1660 client_input_exit_status(int type
, u_int32_t seq
, void *ctxt
)
1662 exit_status
= packet_get_int();
1664 /* Acknowledge the exit. */
1665 packet_start(SSH_CMSG_EXIT_CONFIRMATION
);
1668 * Must wait for packet to be sent since we are
1671 packet_write_wait();
1672 /* Flag that we want to exit. */
1676 client_input_agent_open(int type
, u_int32_t seq
, void *ctxt
)
1679 int remote_id
, sock
;
1681 /* Read the remote channel number from the message. */
1682 remote_id
= packet_get_int();
1686 * Get a connection to the local authentication agent (this may again
1689 sock
= ssh_get_authentication_socket();
1692 * If we could not connect the agent, send an error message back to
1693 * the server. This should never happen unless the agent dies,
1694 * because authentication forwarding is only enabled if we have an
1698 c
= channel_new("", SSH_CHANNEL_OPEN
, sock
, sock
,
1699 -1, 0, 0, 0, "authentication agent connection", 1);
1700 c
->remote_id
= remote_id
;
1704 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE
);
1705 packet_put_int(remote_id
);
1707 /* Send a confirmation to the remote host. */
1708 debug("Forwarding authentication connection.");
1709 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION
);
1710 packet_put_int(remote_id
);
1711 packet_put_int(c
->self
);
1717 client_request_forwarded_tcpip(const char *request_type
, int rchan
)
1720 char *listen_address
, *originator_address
;
1721 int listen_port
, originator_port
;
1724 /* Get rest of the packet */
1725 listen_address
= packet_get_string(NULL
);
1726 listen_port
= packet_get_int();
1727 originator_address
= packet_get_string(NULL
);
1728 originator_port
= packet_get_int();
1731 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1732 listen_address
, listen_port
, originator_address
, originator_port
);
1734 sock
= channel_connect_by_listen_address(listen_port
);
1736 xfree(originator_address
);
1737 xfree(listen_address
);
1740 c
= channel_new("forwarded-tcpip",
1741 SSH_CHANNEL_CONNECTING
, sock
, sock
, -1,
1742 CHAN_TCP_WINDOW_DEFAULT
, CHAN_TCP_PACKET_DEFAULT
, 0,
1743 originator_address
, 1);
1744 xfree(originator_address
);
1745 xfree(listen_address
);
1750 client_request_x11(const char *request_type
, int rchan
)
1754 int originator_port
;
1757 if (!options
.forward_x11
) {
1758 error("Warning: ssh server tried X11 forwarding.");
1759 error("Warning: this is probably a break-in attempt by a malicious server.");
1762 originator
= packet_get_string(NULL
);
1763 if (datafellows
& SSH_BUG_X11FWD
) {
1764 debug2("buggy server: x11 request w/o originator_port");
1765 originator_port
= 0;
1767 originator_port
= packet_get_int();
1770 /* XXX check permission */
1771 debug("client_request_x11: request from %s %d", originator
,
1774 sock
= x11_connect_display();
1777 c
= channel_new("x11",
1778 SSH_CHANNEL_X11_OPEN
, sock
, sock
, -1,
1779 CHAN_TCP_WINDOW_DEFAULT
, CHAN_X11_PACKET_DEFAULT
, 0, "x11", 1);
1785 client_request_agent(const char *request_type
, int rchan
)
1790 if (!options
.forward_agent
) {
1791 error("Warning: ssh server tried agent forwarding.");
1792 error("Warning: this is probably a break-in attempt by a malicious server.");
1795 sock
= ssh_get_authentication_socket();
1798 c
= channel_new("authentication agent connection",
1799 SSH_CHANNEL_OPEN
, sock
, sock
, -1,
1800 CHAN_X11_WINDOW_DEFAULT
, CHAN_TCP_PACKET_DEFAULT
, 0,
1801 "authentication agent connection", 1);
1807 client_request_tun_fwd(int tun_mode
, int local_tun
, int remote_tun
)
1812 if (tun_mode
== SSH_TUNMODE_NO
)
1816 error("Tunnel forwarding is not support for protocol 1");
1820 debug("Requesting tun unit %d in mode %d", local_tun
, tun_mode
);
1822 /* Open local tunnel device */
1823 if ((fd
= tun_open(local_tun
, tun_mode
)) == -1) {
1824 error("Tunnel device open failed.");
1828 c
= channel_new("tun", SSH_CHANNEL_OPENING
, fd
, fd
, -1,
1829 CHAN_TCP_WINDOW_DEFAULT
, CHAN_TCP_PACKET_DEFAULT
, 0, "tun", 1);
1832 #if defined(SSH_TUN_FILTER)
1833 if (options
.tun_open
== SSH_TUNMODE_POINTOPOINT
)
1834 channel_register_filter(c
->self
, sys_tun_infilter
,
1838 packet_start(SSH2_MSG_CHANNEL_OPEN
);
1839 packet_put_cstring("tun@openssh.com");
1840 packet_put_int(c
->self
);
1841 packet_put_int(c
->local_window_max
);
1842 packet_put_int(c
->local_maxpacket
);
1843 packet_put_int(tun_mode
);
1844 packet_put_int(remote_tun
);
1850 /* XXXX move to generic input handler */
1852 client_input_channel_open(int type
, u_int32_t seq
, void *ctxt
)
1857 u_int rmaxpack
, rwindow
, len
;
1859 ctype
= packet_get_string(&len
);
1860 rchan
= packet_get_int();
1861 rwindow
= packet_get_int();
1862 rmaxpack
= packet_get_int();
1864 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1865 ctype
, rchan
, rwindow
, rmaxpack
);
1867 if (strcmp(ctype
, "forwarded-tcpip") == 0) {
1868 c
= client_request_forwarded_tcpip(ctype
, rchan
);
1869 } else if (strcmp(ctype
, "x11") == 0) {
1870 c
= client_request_x11(ctype
, rchan
);
1871 } else if (strcmp(ctype
, "auth-agent@openssh.com") == 0) {
1872 c
= client_request_agent(ctype
, rchan
);
1874 /* XXX duplicate : */
1876 debug("confirm %s", ctype
);
1877 c
->remote_id
= rchan
;
1878 c
->remote_window
= rwindow
;
1879 c
->remote_maxpacket
= rmaxpack
;
1880 if (c
->type
!= SSH_CHANNEL_CONNECTING
) {
1881 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
);
1882 packet_put_int(c
->remote_id
);
1883 packet_put_int(c
->self
);
1884 packet_put_int(c
->local_window
);
1885 packet_put_int(c
->local_maxpacket
);
1889 debug("failure %s", ctype
);
1890 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE
);
1891 packet_put_int(rchan
);
1892 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED
);
1893 if (!(datafellows
& SSH_BUG_OPENFAILURE
)) {
1894 packet_put_cstring("open failed");
1895 packet_put_cstring("");
1902 client_input_channel_req(int type
, u_int32_t seq
, void *ctxt
)
1905 int exitval
, id
, reply
, success
= 0;
1908 id
= packet_get_int();
1909 rtype
= packet_get_string(NULL
);
1910 reply
= packet_get_char();
1912 debug("client_input_channel_req: channel %d rtype %s reply %d",
1916 error("client_input_channel_req: request for channel -1");
1917 } else if ((c
= channel_lookup(id
)) == NULL
) {
1918 error("client_input_channel_req: channel %d: unknown channel", id
);
1919 } else if (strcmp(rtype
, "exit-status") == 0) {
1920 exitval
= packet_get_int();
1921 if (id
== session_ident
) {
1923 exit_status
= exitval
;
1924 } else if (c
->ctl_fd
== -1) {
1925 error("client_input_channel_req: unexpected channel %d",
1928 atomicio(vwrite
, c
->ctl_fd
, &exitval
, sizeof(exitval
));
1934 packet_start(success
?
1935 SSH2_MSG_CHANNEL_SUCCESS
: SSH2_MSG_CHANNEL_FAILURE
);
1942 client_input_global_request(int type
, u_int32_t seq
, void *ctxt
)
1948 rtype
= packet_get_string(NULL
);
1949 want_reply
= packet_get_char();
1950 debug("client_input_global_request: rtype %s want_reply %d",
1953 packet_start(success
?
1954 SSH2_MSG_REQUEST_SUCCESS
: SSH2_MSG_REQUEST_FAILURE
);
1956 packet_write_wait();
1962 client_session2_setup(int id
, int want_tty
, int want_subsystem
,
1963 const char *term
, struct termios
*tiop
, int in_fd
, Buffer
*cmd
, char **env
,
1964 dispatch_fn
*subsys_repl
)
1969 debug2("%s: id %d", __func__
, id
);
1971 if ((c
= channel_lookup(id
)) == NULL
)
1972 fatal("client_session2_setup: channel %d: unknown channel", id
);
1978 /* Store window size in the packet. */
1979 if (ioctl(in_fd
, TIOCGWINSZ
, &ws
) < 0)
1980 memset(&ws
, 0, sizeof(ws
));
1982 channel_request_start(id
, "pty-req", 0);
1983 packet_put_cstring(term
!= NULL
? term
: "");
1984 packet_put_int((u_int
)ws
.ws_col
);
1985 packet_put_int((u_int
)ws
.ws_row
);
1986 packet_put_int((u_int
)ws
.ws_xpixel
);
1987 packet_put_int((u_int
)ws
.ws_ypixel
);
1988 tio
= get_saved_tio();
1989 tty_make_modes(-1, tiop
!= NULL
? tiop
: &tio
);
1991 /* XXX wait for reply */
1995 /* Transfer any environment variables from client to server */
1996 if (options
.num_send_env
!= 0 && env
!= NULL
) {
2000 debug("Sending environment.");
2001 for (i
= 0; env
[i
] != NULL
; i
++) {
2003 name
= xstrdup(env
[i
]);
2004 if ((val
= strchr(name
, '=')) == NULL
) {
2011 for (j
= 0; j
< options
.num_send_env
; j
++) {
2012 if (match_pattern(name
, options
.send_env
[j
])) {
2018 debug3("Ignored env %s", name
);
2023 debug("Sending env %s = %s", name
, val
);
2024 channel_request_start(id
, "env", 0);
2025 packet_put_cstring(name
);
2026 packet_put_cstring(val
);
2032 len
= buffer_len(cmd
);
2036 if (want_subsystem
) {
2037 debug("Sending subsystem: %.*s", len
, (u_char
*)buffer_ptr(cmd
));
2038 channel_request_start(id
, "subsystem", subsys_repl
!= NULL
);
2039 if (subsys_repl
!= NULL
) {
2040 /* register callback for reply */
2041 /* XXX we assume that client_loop has already been called */
2042 dispatch_set(SSH2_MSG_CHANNEL_FAILURE
, subsys_repl
);
2043 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS
, subsys_repl
);
2046 debug("Sending command: %.*s", len
, (u_char
*)buffer_ptr(cmd
));
2047 channel_request_start(id
, "exec", 0);
2049 packet_put_string(buffer_ptr(cmd
), buffer_len(cmd
));
2052 channel_request_start(id
, "shell", 0);
2058 client_init_dispatch_20(void)
2060 dispatch_init(&dispatch_protocol_error
);
2062 dispatch_set(SSH2_MSG_CHANNEL_CLOSE
, &channel_input_oclose
);
2063 dispatch_set(SSH2_MSG_CHANNEL_DATA
, &channel_input_data
);
2064 dispatch_set(SSH2_MSG_CHANNEL_EOF
, &channel_input_ieof
);
2065 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA
, &channel_input_extended_data
);
2066 dispatch_set(SSH2_MSG_CHANNEL_OPEN
, &client_input_channel_open
);
2067 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION
, &channel_input_open_confirmation
);
2068 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE
, &channel_input_open_failure
);
2069 dispatch_set(SSH2_MSG_CHANNEL_REQUEST
, &client_input_channel_req
);
2070 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST
, &channel_input_window_adjust
);
2071 dispatch_set(SSH2_MSG_GLOBAL_REQUEST
, &client_input_global_request
);
2074 dispatch_set(SSH2_MSG_KEXINIT
, &kex_input_kexinit
);
2076 /* global request reply messages */
2077 dispatch_set(SSH2_MSG_REQUEST_FAILURE
, &client_global_request_reply
);
2078 dispatch_set(SSH2_MSG_REQUEST_SUCCESS
, &client_global_request_reply
);
2081 client_init_dispatch_13(void)
2083 dispatch_init(NULL
);
2084 dispatch_set(SSH_MSG_CHANNEL_CLOSE
, &channel_input_close
);
2085 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION
, &channel_input_close_confirmation
);
2086 dispatch_set(SSH_MSG_CHANNEL_DATA
, &channel_input_data
);
2087 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION
, &channel_input_open_confirmation
);
2088 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE
, &channel_input_open_failure
);
2089 dispatch_set(SSH_MSG_PORT_OPEN
, &channel_input_port_open
);
2090 dispatch_set(SSH_SMSG_EXITSTATUS
, &client_input_exit_status
);
2091 dispatch_set(SSH_SMSG_STDERR_DATA
, &client_input_stderr_data
);
2092 dispatch_set(SSH_SMSG_STDOUT_DATA
, &client_input_stdout_data
);
2094 dispatch_set(SSH_SMSG_AGENT_OPEN
, options
.forward_agent
?
2095 &client_input_agent_open
: &deny_input_open
);
2096 dispatch_set(SSH_SMSG_X11_OPEN
, options
.forward_x11
?
2097 &x11_input_open
: &deny_input_open
);
2100 client_init_dispatch_15(void)
2102 client_init_dispatch_13();
2103 dispatch_set(SSH_MSG_CHANNEL_CLOSE
, &channel_input_ieof
);
2104 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION
, & channel_input_oclose
);
2107 client_init_dispatch(void)
2110 client_init_dispatch_20();
2112 client_init_dispatch_13();
2114 client_init_dispatch_15();
2117 /* client specific fatal cleanup */
2122 leave_non_blocking();
2123 if (options
.control_path
!= NULL
&& control_fd
!= -1)
2124 unlink(options
.control_path
);