1 /* $OpenBSD: clientloop.c,v 1.284 2016/02/08 10:57:07 djm 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/param.h> /* MIN MAX */
65 #include <sys/types.h>
66 #include <sys/ioctl.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>
90 #include "openbsd-compat/sys-queue.h"
103 #include "myproposal.h"
106 #include "readconf.h"
107 #include "clientloop.h"
108 #include "sshconnect.h"
110 #include "atomicio.h"
115 #include "hostfile.h"
118 extern Options options;
120 /* Flag indicating that stdin should be redirected from /dev/null. */
121 extern int stdin_null_flag;
123 /* Flag indicating that no shell has been requested */
124 extern int no_shell_flag;
127 extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
130 * Name of the host we are connecting to. This is the name given on the
131 * command line, or the HostName specified for the user-supplied name in a
132 * configuration file.
137 * Flag to indicate that we have received a window change signal which has
138 * not yet been processed. This will cause a message indicating the new
139 * window size to be sent to the server a little later. This is volatile
140 * because this is updated in a signal handler.
142 static volatile sig_atomic_t received_window_change_signal = 0;
143 static volatile sig_atomic_t received_signal = 0;
145 /* Flag indicating whether the user's terminal is in non-blocking mode. */
146 static int in_non_blocking_mode = 0;
148 /* Time when backgrounded control master using ControlPersist should exit */
149 static time_t control_persist_exit_time = 0;
151 /* Common data for the client loop code. */
152 volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
153 static int escape_char1; /* Escape character. (proto1 only) */
154 static int escape_pending1; /* Last character was an escape (proto1 only) */
155 static int last_was_cr; /* Last character was a newline. */
156 static int exit_status; /* Used to store the command exit status. */
157 static int stdin_eof; /* EOF has been encountered on stderr. */
158 static Buffer stdin_buffer; /* Buffer for stdin data. */
159 static Buffer stdout_buffer; /* Buffer for stdout data. */
160 static Buffer stderr_buffer; /* Buffer for stderr data. */
161 static u_int buffer_high; /* Soft max buffer size. */
162 static int connection_in; /* Connection to server (input). */
163 static int connection_out; /* Connection to server (output). */
164 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
165 static int session_closed; /* In SSH2: login session closed. */
166 static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
168 static void client_init_dispatch(void);
169 int session_ident = -1;
171 /* Track escape per proto2 channel */
172 struct escape_filter_ctx {
177 /* Context for channel confirmation replies */
178 struct channel_reply_ctx {
179 const char *request_type;
181 enum confirm_action action;
184 /* Global request success/failure callbacks */
185 struct global_confirm {
186 TAILQ_ENTRY(global_confirm) entry;
187 global_confirm_cb *cb;
191 TAILQ_HEAD(global_confirms, global_confirm);
192 static struct global_confirms global_confirms =
193 TAILQ_HEAD_INITIALIZER(global_confirms);
195 void ssh_process_session2_setup(int, int, int, Buffer *);
197 /* Restores stdin to blocking mode. */
200 leave_non_blocking(void)
202 if (in_non_blocking_mode) {
203 unset_nonblock(fileno(stdin));
204 in_non_blocking_mode = 0;
208 /* Puts stdin terminal in non-blocking mode. */
211 enter_non_blocking(void)
213 in_non_blocking_mode = 1;
214 set_nonblock(fileno(stdin));
218 * Signal handler for the window change signal (SIGWINCH). This just sets a
219 * flag indicating that the window has changed.
223 window_change_handler(int sig)
225 received_window_change_signal = 1;
226 signal(SIGWINCH, window_change_handler);
230 * Signal handler for signals that cause the program to terminate. These
231 * signals must be trapped to restore terminal modes.
235 signal_handler(int sig)
237 received_signal = sig;
242 * Returns current time in seconds from Jan 1, 1970 with the maximum
243 * available resolution.
247 get_current_time(void)
250 gettimeofday(&tv, NULL);
251 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
255 * Sets control_persist_exit_time to the absolute time when the
256 * backgrounded control master should exit due to expiry of the
257 * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
258 * control master process, or if there is no ControlPersist timeout.
261 set_control_persist_exit_time(void)
263 if (muxserver_sock == -1 || !options.control_persist
264 || options.control_persist_timeout == 0) {
265 /* not using a ControlPersist timeout */
266 control_persist_exit_time = 0;
267 } else if (channel_still_open()) {
268 /* some client connections are still open */
269 if (control_persist_exit_time > 0)
270 debug2("%s: cancel scheduled exit", __func__);
271 control_persist_exit_time = 0;
272 } else if (control_persist_exit_time <= 0) {
273 /* a client connection has recently closed */
274 control_persist_exit_time = monotime() +
275 (time_t)options.control_persist_timeout;
276 debug2("%s: schedule exit in %d seconds", __func__,
277 options.control_persist_timeout);
279 /* else we are already counting down to the timeout */
282 #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
284 client_x11_display_valid(const char *display)
291 dlen = strlen(display);
292 for (i = 0; i < dlen; i++) {
293 if (!isalnum((u_char)display[i]) &&
294 strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
295 debug("Invalid character '%c' in DISPLAY", display[i]);
302 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
303 #define X11_TIMEOUT_SLACK 60
305 client_x11_get_proto(const char *display, const char *xauth_path,
306 u_int trusted, u_int timeout, char **_proto, char **_data)
308 char cmd[1024], line[512], xdisplay[512];
309 char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
310 static char proto[512], data[512];
312 int got_data = 0, generated = 0, do_unlink = 0, i, r;
314 u_int now, x11_timeout_real;
318 proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
320 if (!client_x11_display_valid(display)) {
322 logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
326 if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
327 debug("No xauth program.");
331 if (xauth_path != NULL) {
333 * Handle FamilyLocal case where $DISPLAY does
334 * not match an authorization entry. For this we
335 * just try "xauth list unix:displaynum.screennum".
336 * XXX: "localhost" match to determine FamilyLocal
339 if (strncmp(display, "localhost:", 10) == 0) {
340 if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
341 display + 10)) < 0 ||
342 (size_t)r >= sizeof(xdisplay)) {
343 error("%s: display name too long", __func__);
350 * Generate an untrusted X11 auth cookie.
352 * The authentication cookie should briefly outlive
353 * ssh's willingness to forward X11 connections to
354 * avoid nasty fail-open behaviour in the X server.
356 mktemp_proto(xauthdir, sizeof(xauthdir));
357 if (mkdtemp(xauthdir) == NULL) {
358 error("%s: mkdtemp: %s",
359 __func__, strerror(errno));
363 if ((r = snprintf(xauthfile, sizeof(xauthfile),
364 "%s/xauthfile", xauthdir)) < 0 ||
365 (size_t)r >= sizeof(xauthfile)) {
366 error("%s: xauthfile path too long", __func__);
372 if (timeout >= UINT_MAX - X11_TIMEOUT_SLACK)
373 x11_timeout_real = UINT_MAX;
375 x11_timeout_real = timeout + X11_TIMEOUT_SLACK;
376 if ((r = snprintf(cmd, sizeof(cmd),
377 "%s -f %s generate %s " SSH_X11_PROTO
378 " untrusted timeout %u 2>" _PATH_DEVNULL,
379 xauth_path, xauthfile, display,
380 x11_timeout_real)) < 0 ||
381 (size_t)r >= sizeof(cmd))
382 fatal("%s: cmd too long", __func__);
383 debug2("%s: %s", __func__, cmd);
384 if (x11_refuse_time == 0) {
385 now = monotime() + 1;
386 if (UINT_MAX - timeout < now)
387 x11_refuse_time = UINT_MAX;
389 x11_refuse_time = now + timeout;
390 channel_set_x11_refuse_time(x11_refuse_time);
392 if (system(cmd) == 0)
397 * When in untrusted mode, we read the cookie only if it was
398 * successfully generated as an untrusted one in the step
401 if (trusted || generated) {
402 snprintf(cmd, sizeof(cmd),
403 "%s %s%s list %s 2>" _PATH_DEVNULL,
405 generated ? "-f " : "" ,
406 generated ? xauthfile : "",
408 debug2("x11_get_proto: %s", cmd);
410 if (f && fgets(line, sizeof(line), f) &&
411 sscanf(line, "%*s %511s %511s", proto, data) == 2)
423 /* Don't fall back to fake X11 data for untrusted forwarding */
424 if (!trusted && !got_data) {
425 error("Warning: untrusted X11 forwarding setup failed: "
426 "xauth key data not generated");
431 * If we didn't get authentication data, just make up some
432 * data. The forwarding code will check the validity of the
433 * response anyway, and substitute this data. The X11
434 * server, however, will ignore this fake data and use
435 * whatever authentication mechanisms it was using otherwise
436 * for the local connection.
441 logit("Warning: No xauth data; "
442 "using fake authentication data for X11 forwarding.");
443 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
444 for (i = 0; i < 16; i++) {
447 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
457 * This is called when the interactive is entered. This checks if there is
458 * an EOF coming on stdin. We must check this explicitly, as select() does
459 * not appear to wake up when redirecting from /dev/null.
463 client_check_initial_eof_on_stdin(void)
469 * If standard input is to be "redirected from /dev/null", we simply
470 * mark that we have seen an EOF and send an EOF message to the
471 * server. Otherwise, we try to read a single character; it appears
472 * that for some files, such /dev/null, select() never wakes up for
473 * read for this descriptor, which means that we never get EOF. This
474 * way we will get the EOF if stdin comes from /dev/null or similar.
476 if (stdin_null_flag) {
477 /* Fake EOF on stdin. */
478 debug("Sending eof.");
480 packet_start(SSH_CMSG_EOF);
483 enter_non_blocking();
485 /* Check for immediate EOF on stdin. */
486 len = read(fileno(stdin), buf, 1);
489 * EOF. Record that we have seen it and send
492 debug("Sending eof.");
494 packet_start(SSH_CMSG_EOF);
496 } else if (len > 0) {
498 * Got data. We must store the data in the buffer,
499 * and also process it as an escape character if
502 if ((u_char) buf[0] == escape_char1)
505 buffer_append(&stdin_buffer, buf, 1);
507 leave_non_blocking();
513 * Make packets from buffered stdin data, and buffer them for sending to the
518 client_make_packets_from_stdin_data(void)
522 /* Send buffered stdin data to the server. */
523 while (buffer_len(&stdin_buffer) > 0 &&
524 packet_not_very_much_data_to_write()) {
525 len = buffer_len(&stdin_buffer);
526 /* Keep the packets at reasonable size. */
527 if (len > packet_get_maxsize())
528 len = packet_get_maxsize();
529 packet_start(SSH_CMSG_STDIN_DATA);
530 packet_put_string(buffer_ptr(&stdin_buffer), len);
532 buffer_consume(&stdin_buffer, len);
533 /* If we have a pending EOF, send it now. */
534 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
535 packet_start(SSH_CMSG_EOF);
542 * Checks if the client window has changed, and sends a packet about it to
543 * the server if so. The actual change is detected elsewhere (by a software
544 * interrupt on Unix); this just checks the flag and sends a message if
549 client_check_window_change(void)
553 if (! received_window_change_signal)
556 received_window_change_signal = 0;
558 debug2("client_check_window_change: changed");
561 channel_send_window_changes();
563 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
565 packet_start(SSH_CMSG_WINDOW_SIZE);
566 packet_put_int((u_int)ws.ws_row);
567 packet_put_int((u_int)ws.ws_col);
568 packet_put_int((u_int)ws.ws_xpixel);
569 packet_put_int((u_int)ws.ws_ypixel);
575 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
577 struct global_confirm *gc;
579 if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
582 gc->cb(type, seq, gc->ctx);
583 if (--gc->ref_count <= 0) {
584 TAILQ_REMOVE(&global_confirms, gc, entry);
585 explicit_bzero(gc, sizeof(*gc));
589 packet_set_alive_timeouts(0);
594 server_alive_check(void)
596 if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
597 logit("Timeout, server %s not responding.", host);
600 packet_start(SSH2_MSG_GLOBAL_REQUEST);
601 packet_put_cstring("keepalive@openssh.com");
602 packet_put_char(1); /* boolean: want reply */
604 /* Insert an empty placeholder to maintain ordering */
605 client_register_global_confirm(NULL, NULL);
609 * Waits until the client can do something (some data becomes available on
610 * one of the file descriptors).
613 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
614 int *maxfdp, u_int *nallocp, int rekeying)
616 struct timeval tv, *tvp;
618 time_t minwait_secs = 0, server_alive_time = 0, now = monotime();
621 /* Add any selections by the channel mechanism. */
622 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
623 &minwait_secs, rekeying);
626 /* Read from the connection, unless our buffers are full. */
627 if (buffer_len(&stdout_buffer) < buffer_high &&
628 buffer_len(&stderr_buffer) < buffer_high &&
629 channel_not_very_much_buffered_data())
630 FD_SET(connection_in, *readsetp);
632 * Read from stdin, unless we have seen EOF or have very much
633 * buffered data to send to the server.
635 if (!stdin_eof && packet_not_very_much_data_to_write())
636 FD_SET(fileno(stdin), *readsetp);
638 /* Select stdout/stderr if have data in buffer. */
639 if (buffer_len(&stdout_buffer) > 0)
640 FD_SET(fileno(stdout), *writesetp);
641 if (buffer_len(&stderr_buffer) > 0)
642 FD_SET(fileno(stderr), *writesetp);
644 /* channel_prepare_select could have closed the last channel */
645 if (session_closed && !channel_still_open() &&
646 !packet_have_data_to_write()) {
647 /* clear mask since we did not call select() */
648 memset(*readsetp, 0, *nallocp);
649 memset(*writesetp, 0, *nallocp);
652 FD_SET(connection_in, *readsetp);
656 /* Select server connection if have data to write to the server. */
657 if (packet_have_data_to_write())
658 FD_SET(connection_out, *writesetp);
661 * Wait for something to happen. This will suspend the process until
662 * some selected descriptor can be read, written, or has some other
663 * event pending, or a timeout expires.
666 timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
667 if (options.server_alive_interval > 0 && compat20) {
668 timeout_secs = options.server_alive_interval;
669 server_alive_time = now + options.server_alive_interval;
671 if (options.rekey_interval > 0 && compat20 && !rekeying)
672 timeout_secs = MIN(timeout_secs, packet_get_rekey_timeout());
673 set_control_persist_exit_time();
674 if (control_persist_exit_time > 0) {
675 timeout_secs = MIN(timeout_secs,
676 control_persist_exit_time - now);
677 if (timeout_secs < 0)
680 if (minwait_secs != 0)
681 timeout_secs = MIN(timeout_secs, (int)minwait_secs);
682 if (timeout_secs == INT_MAX)
685 tv.tv_sec = timeout_secs;
690 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
695 * We have to clear the select masks, because we return.
696 * We have to return, because the mainloop checks for the flags
697 * set by the signal handlers.
699 memset(*readsetp, 0, *nallocp);
700 memset(*writesetp, 0, *nallocp);
704 /* Note: we might still have data in the buffers. */
705 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
706 buffer_append(&stderr_buffer, buf, strlen(buf));
708 } else if (ret == 0) {
710 * Timeout. Could have been either keepalive or rekeying.
711 * Keepalive we check here, rekeying is checked in clientloop.
713 if (server_alive_time != 0 && server_alive_time <= monotime())
714 server_alive_check();
720 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
722 /* Flush stdout and stderr buffers. */
723 if (buffer_len(bout) > 0)
724 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
726 if (buffer_len(berr) > 0)
727 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
730 leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
733 * Free (and clear) the buffer to reduce the amount of data that gets
740 /* Send the suspend signal to the program itself. */
741 kill(getpid(), SIGTSTP);
743 /* Reset window sizes in case they have changed */
744 received_window_change_signal = 1;
746 /* OK, we have been continued by the user. Reinitialize buffers. */
751 enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
755 client_process_net_input(fd_set *readset)
758 char buf[SSH_IOBUFSZ];
761 * Read input from the server, and add any such data to the buffer of
762 * the packet subsystem.
764 if (FD_ISSET(connection_in, readset)) {
765 /* Read as much as possible. */
766 len = read(connection_in, buf, sizeof(buf));
769 * Received EOF. The remote host has closed the
772 snprintf(buf, sizeof buf,
773 "Connection to %.300s closed by remote host.\r\n",
775 buffer_append(&stderr_buffer, buf, strlen(buf));
780 * There is a kernel bug on Solaris that causes select to
781 * sometimes wake up even though there is no data available.
784 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
789 * An error has encountered. Perhaps there is a
792 snprintf(buf, sizeof buf,
793 "Read from remote host %.300s: %.100s\r\n",
794 host, strerror(errno));
795 buffer_append(&stderr_buffer, buf, strlen(buf));
799 packet_process_incoming(buf, len);
804 client_status_confirm(int type, Channel *c, void *ctx)
806 struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
811 * If a TTY was explicitly requested, then a failure to allocate
814 if (cr->action == CONFIRM_TTY &&
815 (options.request_tty == REQUEST_TTY_FORCE ||
816 options.request_tty == REQUEST_TTY_YES))
817 cr->action = CONFIRM_CLOSE;
819 /* XXX supress on mux _client_ quietmode */
820 tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
821 c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
823 if (type == SSH2_MSG_CHANNEL_SUCCESS) {
824 debug2("%s request accepted on channel %d",
825 cr->request_type, c->self);
826 } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
828 snprintf(errmsg, sizeof(errmsg),
829 "%s request failed\r\n", cr->request_type);
831 snprintf(errmsg, sizeof(errmsg),
832 "%s request failed on channel %d",
833 cr->request_type, c->self);
835 /* If error occurred on primary session channel, then exit */
836 if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
839 * If error occurred on mux client, append to
843 buffer_append(&c->extended, errmsg,
847 if (cr->action == CONFIRM_TTY) {
849 * If a TTY allocation error occurred, then arrange
850 * for the correct TTY to leave raw mode.
852 if (c->self == session_ident)
855 mux_tty_alloc_failed(c);
856 } else if (cr->action == CONFIRM_CLOSE) {
858 chan_write_failed(c);
865 client_abandon_status_confirm(Channel *c, void *ctx)
871 client_expect_confirm(int id, const char *request,
872 enum confirm_action action)
874 struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
876 cr->request_type = request;
879 channel_register_status_confirm(id, client_status_confirm,
880 client_abandon_status_confirm, cr);
884 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
886 struct global_confirm *gc, *last_gc;
888 /* Coalesce identical callbacks */
889 last_gc = TAILQ_LAST(&global_confirms, global_confirms);
890 if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
891 if (++last_gc->ref_count >= INT_MAX)
892 fatal("%s: last_gc->ref_count = %d",
893 __func__, last_gc->ref_count);
897 gc = xcalloc(1, sizeof(*gc));
901 TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
905 process_cmdline(void)
907 void (*handler)(int);
909 int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
912 memset(&fwd, 0, sizeof(fwd));
914 leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
915 handler = signal(SIGINT, SIG_IGN);
916 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
919 while (isspace((u_char)*s))
922 s++; /* Skip cmdline '-', if any */
926 if (*s == 'h' || *s == 'H' || *s == '?') {
928 logit(" -L[bind_address:]port:host:hostport "
929 "Request local forward");
930 logit(" -R[bind_address:]port:host:hostport "
931 "Request remote forward");
932 logit(" -D[bind_address:]port "
933 "Request dynamic forward");
934 logit(" -KL[bind_address:]port "
935 "Cancel local forward");
936 logit(" -KR[bind_address:]port "
937 "Cancel remote forward");
938 logit(" -KD[bind_address:]port "
939 "Cancel dynamic forward");
940 if (!options.permit_local_command)
943 "Execute local command");
947 if (*s == '!' && options.permit_local_command) {
964 logit("Invalid command.");
968 if (delete && !compat20) {
969 logit("Not supported for SSH protocol version 1.");
973 while (isspace((u_char)*++s))
976 /* XXX update list of forwards in options */
978 /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
979 if (!parse_forward(&fwd, s, 1, 0)) {
980 logit("Bad forwarding close specification.");
984 ok = channel_request_rforward_cancel(&fwd) == 0;
986 ok = channel_cancel_lport_listener(&fwd,
987 0, &options.fwd_opts) > 0;
989 ok = channel_cancel_lport_listener(&fwd,
990 CHANNEL_CANCEL_PORT_STATIC,
991 &options.fwd_opts) > 0;
993 logit("Unkown port forwarding.");
996 logit("Canceled forwarding.");
998 if (!parse_forward(&fwd, s, dynamic, remote)) {
999 logit("Bad forwarding specification.");
1002 if (local || dynamic) {
1003 if (!channel_setup_local_fwd_listener(&fwd,
1004 &options.fwd_opts)) {
1005 logit("Port forwarding failed.");
1009 if (channel_request_remote_forwarding(&fwd) < 0) {
1010 logit("Port forwarding failed.");
1014 logit("Forwarding port.");
1018 signal(SIGINT, handler);
1019 enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1021 free(fwd.listen_host);
1022 free(fwd.listen_path);
1023 free(fwd.connect_host);
1024 free(fwd.connect_path);
1027 /* reasons to suppress output of an escape command in help output */
1028 #define SUPPRESS_NEVER 0 /* never suppress, always show */
1029 #define SUPPRESS_PROTO1 1 /* don't show in protocol 1 sessions */
1030 #define SUPPRESS_MUXCLIENT 2 /* don't show in mux client sessions */
1031 #define SUPPRESS_MUXMASTER 4 /* don't show in mux master sessions */
1032 #define SUPPRESS_SYSLOG 8 /* don't show when logging to syslog */
1033 struct escape_help_text {
1038 static struct escape_help_text esc_txt[] = {
1039 {".", "terminate session", SUPPRESS_MUXMASTER},
1040 {".", "terminate connection (and any multiplexed sessions)",
1041 SUPPRESS_MUXCLIENT},
1042 {"B", "send a BREAK to the remote system", SUPPRESS_PROTO1},
1043 {"C", "open a command line", SUPPRESS_MUXCLIENT},
1044 {"R", "request rekey", SUPPRESS_PROTO1},
1045 {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1046 {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
1047 {"#", "list forwarded connections", SUPPRESS_NEVER},
1048 {"&", "background ssh (when waiting for connections to terminate)",
1049 SUPPRESS_MUXCLIENT},
1050 {"?", "this message", SUPPRESS_NEVER},
1054 print_escape_help(Buffer *b, int escape_char, int protocol2, int mux_client,
1057 unsigned int i, suppress_flags;
1060 snprintf(string, sizeof string, "%c?\r\n"
1061 "Supported escape sequences:\r\n", escape_char);
1062 buffer_append(b, string, strlen(string));
1064 suppress_flags = (protocol2 ? 0 : SUPPRESS_PROTO1) |
1065 (mux_client ? SUPPRESS_MUXCLIENT : 0) |
1066 (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1067 (using_stderr ? 0 : SUPPRESS_SYSLOG);
1069 for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
1070 if (esc_txt[i].flags & suppress_flags)
1072 snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1073 escape_char, esc_txt[i].cmd, esc_txt[i].text);
1074 buffer_append(b, string, strlen(string));
1077 snprintf(string, sizeof string,
1078 " %c%c - send the escape character by typing it twice\r\n"
1079 "(Note that escapes are only recognized immediately after "
1080 "newline.)\r\n", escape_char, escape_char);
1081 buffer_append(b, string, strlen(string));
1085 * Process the characters one by one, call with c==NULL for proto1 case.
1088 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
1097 int *escape_pendingp, escape_char;
1098 struct escape_filter_ctx *efc;
1101 escape_pendingp = &escape_pending1;
1102 escape_char = escape_char1;
1104 if (c->filter_ctx == NULL)
1106 efc = (struct escape_filter_ctx *)c->filter_ctx;
1107 escape_pendingp = &efc->escape_pending;
1108 escape_char = efc->escape_char;
1114 for (i = 0; i < (u_int)len; i++) {
1115 /* Get one character at a time. */
1118 if (*escape_pendingp) {
1119 /* We have previously seen an escape character. */
1120 /* Clear the flag now. */
1121 *escape_pendingp = 0;
1123 /* Process the escaped character. */
1126 /* Terminate the connection. */
1127 snprintf(string, sizeof string, "%c.\r\n",
1129 buffer_append(berr, string, strlen(string));
1131 if (c && c->ctl_chan != -1) {
1132 chan_read_failed(c);
1133 chan_write_failed(c);
1135 c->detach_user(c->self, NULL);
1136 c->type = SSH_CHANNEL_ABANDONED;
1137 buffer_clear(&c->input);
1145 /* XXX support this for mux clients */
1146 if (c && c->ctl_chan != -1) {
1150 snprintf(b, sizeof b, "^Z");
1152 snprintf(b, sizeof b, "%c", ch);
1153 snprintf(string, sizeof string,
1154 "%c%s escape not available to "
1155 "multiplexed sessions\r\n",
1157 buffer_append(berr, string,
1161 /* Suspend the program. Inform the user */
1162 snprintf(string, sizeof string,
1163 "%c^Z [suspend ssh]\r\n", escape_char);
1164 buffer_append(berr, string, strlen(string));
1166 /* Restore terminal modes and suspend. */
1167 client_suspend_self(bin, bout, berr);
1169 /* We have been continued. */
1174 snprintf(string, sizeof string,
1175 "%cB\r\n", escape_char);
1176 buffer_append(berr, string,
1178 channel_request_start(c->self,
1180 packet_put_int(1000);
1187 if (datafellows & SSH_BUG_NOREKEY)
1188 logit("Server does not "
1189 "support re-keying");
1198 if (c && c->ctl_chan != -1)
1200 if (!log_is_on_stderr()) {
1201 snprintf(string, sizeof string,
1202 "%c%c [Logging to syslog]\r\n",
1204 buffer_append(berr, string,
1208 if (ch == 'V' && options.log_level >
1210 log_change_level(--options.log_level);
1211 if (ch == 'v' && options.log_level <
1212 SYSLOG_LEVEL_DEBUG3)
1213 log_change_level(++options.log_level);
1214 snprintf(string, sizeof string,
1215 "%c%c [LogLevel %s]\r\n", escape_char, ch,
1216 log_level_name(options.log_level));
1217 buffer_append(berr, string, strlen(string));
1221 if (c && c->ctl_chan != -1)
1224 * Detach the program (continue to serve
1225 * connections, but put in background and no
1226 * more new connections).
1228 /* Restore tty modes. */
1230 options.request_tty == REQUEST_TTY_FORCE);
1232 /* Stop listening for new connections. */
1233 channel_stop_listening();
1235 snprintf(string, sizeof string,
1236 "%c& [backgrounded]\n", escape_char);
1237 buffer_append(berr, string, strlen(string));
1239 /* Fork into background. */
1242 error("fork: %.100s", strerror(errno));
1245 if (pid != 0) { /* This is the parent. */
1246 /* The parent just exits. */
1249 /* The child continues serving connections. */
1251 buffer_append(bin, "\004", 1);
1252 /* fake EOF on stdin */
1254 } else if (!stdin_eof) {
1256 * Sending SSH_CMSG_EOF alone does not
1257 * always appear to be enough. So we
1258 * try to send an EOF character first.
1260 packet_start(SSH_CMSG_STDIN_DATA);
1261 packet_put_string("\004", 1);
1265 if (buffer_len(bin) == 0) {
1266 packet_start(SSH_CMSG_EOF);
1273 print_escape_help(berr, escape_char, compat20,
1274 (c && c->ctl_chan != -1),
1275 log_is_on_stderr());
1279 snprintf(string, sizeof string, "%c#\r\n",
1281 buffer_append(berr, string, strlen(string));
1282 s = channel_open_message();
1283 buffer_append(berr, s, strlen(s));
1288 if (c && c->ctl_chan != -1)
1294 if (ch != escape_char) {
1295 buffer_put_char(bin, escape_char);
1298 /* Escaped characters fall through here */
1303 * The previous character was not an escape char.
1304 * Check if this is an escape.
1306 if (last_was_cr && ch == escape_char) {
1308 * It is. Set the flag and continue to
1311 *escape_pendingp = 1;
1317 * Normal character. Record whether it was a newline,
1318 * and append it to the buffer.
1320 last_was_cr = (ch == '\r' || ch == '\n');
1321 buffer_put_char(bin, ch);
1328 client_process_input(fd_set *readset)
1331 char buf[SSH_IOBUFSZ];
1333 /* Read input from stdin. */
1334 if (FD_ISSET(fileno(stdin), readset)) {
1335 /* Read as much as possible. */
1336 len = read(fileno(stdin), buf, sizeof(buf));
1338 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1339 return; /* we'll try again later */
1342 * Received EOF or error. They are treated
1343 * similarly, except that an error message is printed
1344 * if it was an error condition.
1347 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1349 buffer_append(&stderr_buffer, buf, strlen(buf));
1351 /* Mark that we have seen EOF. */
1354 * Send an EOF message to the server unless there is
1355 * data in the buffer. If there is data in the
1356 * buffer, no message will be sent now. Code
1357 * elsewhere will send the EOF when the buffer
1358 * becomes empty if stdin_eof is set.
1360 if (buffer_len(&stdin_buffer) == 0) {
1361 packet_start(SSH_CMSG_EOF);
1364 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1366 * Normal successful read, and no escape character.
1367 * Just append the data to buffer.
1369 buffer_append(&stdin_buffer, buf, len);
1372 * Normal, successful read. But we have an escape
1373 * character and have to process the characters one
1376 if (process_escapes(NULL, &stdin_buffer,
1377 &stdout_buffer, &stderr_buffer, buf, len) == -1)
1384 client_process_output(fd_set *writeset)
1389 /* Write buffered output to stdout. */
1390 if (FD_ISSET(fileno(stdout), writeset)) {
1391 /* Write as much data as possible. */
1392 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1393 buffer_len(&stdout_buffer));
1395 if (errno == EINTR || errno == EAGAIN ||
1396 errno == EWOULDBLOCK)
1400 * An error or EOF was encountered. Put an
1401 * error message to stderr buffer.
1403 snprintf(buf, sizeof buf,
1404 "write stdout: %.50s\r\n", strerror(errno));
1405 buffer_append(&stderr_buffer, buf, strlen(buf));
1410 /* Consume printed data from the buffer. */
1411 buffer_consume(&stdout_buffer, len);
1413 /* Write buffered output to stderr. */
1414 if (FD_ISSET(fileno(stderr), writeset)) {
1415 /* Write as much data as possible. */
1416 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1417 buffer_len(&stderr_buffer));
1419 if (errno == EINTR || errno == EAGAIN ||
1420 errno == EWOULDBLOCK)
1424 * EOF or error, but can't even print
1431 /* Consume printed characters from the buffer. */
1432 buffer_consume(&stderr_buffer, len);
1437 * Get packets from the connection input buffer, and process them as long as
1438 * there are packets available.
1440 * Any unknown packets received during the actual
1441 * session cause the session to terminate. This is
1442 * intended to make debugging easier since no
1443 * confirmations are sent. Any compatible protocol
1444 * extensions must be negotiated during the
1445 * preparatory phase.
1449 client_process_buffered_input_packets(void)
1451 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, active_state);
1454 /* scan buf[] for '~' before sending data to the peer */
1456 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1458 client_new_escape_filter_ctx(int escape_char)
1460 struct escape_filter_ctx *ret;
1462 ret = xcalloc(1, sizeof(*ret));
1463 ret->escape_pending = 0;
1464 ret->escape_char = escape_char;
1468 /* Free the escape filter context on channel free */
1470 client_filter_cleanup(int cid, void *ctx)
1476 client_simple_escape_filter(Channel *c, char *buf, int len)
1478 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1481 return process_escapes(c, &c->input, &c->output, &c->extended,
1486 client_channel_closed(int id, void *arg)
1488 channel_cancel_cleanup(id);
1490 leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1494 * Implements the interactive session with the server. This is called after
1495 * the user has been authenticated, and a command has been started on the
1496 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1497 * used as an escape character for terminating or suspending the session.
1501 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1503 fd_set *readset = NULL, *writeset = NULL;
1504 double start_time, total_time;
1505 int r, max_fd = 0, max_fd2 = 0, len;
1506 u_int64_t ibytes, obytes;
1510 debug("Entering interactive session.");
1512 if (options.control_master &&
1513 ! option_clear_or_none(options.control_path)) {
1514 debug("pledge: id");
1515 if (pledge("stdio rpath wpath cpath unix inet dns proc exec id tty",
1517 fatal("%s pledge(): %s", __func__, strerror(errno));
1519 } else if (options.forward_x11 || options.permit_local_command) {
1520 debug("pledge: exec");
1521 if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1523 fatal("%s pledge(): %s", __func__, strerror(errno));
1525 } else if (options.update_hostkeys) {
1526 debug("pledge: filesystem full");
1527 if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1529 fatal("%s pledge(): %s", __func__, strerror(errno));
1531 } else if (! option_clear_or_none(options.proxy_command)) {
1532 debug("pledge: proc");
1533 if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1534 fatal("%s pledge(): %s", __func__, strerror(errno));
1537 debug("pledge: network");
1538 if (pledge("stdio unix inet dns tty", NULL) == -1)
1539 fatal("%s pledge(): %s", __func__, strerror(errno));
1542 start_time = get_current_time();
1544 /* Initialize variables. */
1545 escape_pending1 = 0;
1549 buffer_high = 64 * 1024;
1550 connection_in = packet_get_connection_in();
1551 connection_out = packet_get_connection_out();
1552 max_fd = MAX(connection_in, connection_out);
1555 /* enable nonblocking unless tty */
1556 if (!isatty(fileno(stdin)))
1557 set_nonblock(fileno(stdin));
1558 if (!isatty(fileno(stdout)))
1559 set_nonblock(fileno(stdout));
1560 if (!isatty(fileno(stderr)))
1561 set_nonblock(fileno(stderr));
1562 max_fd = MAX(max_fd, fileno(stdin));
1563 max_fd = MAX(max_fd, fileno(stdout));
1564 max_fd = MAX(max_fd, fileno(stderr));
1567 escape_char1 = escape_char_arg;
1569 /* Initialize buffers. */
1570 buffer_init(&stdin_buffer);
1571 buffer_init(&stdout_buffer);
1572 buffer_init(&stderr_buffer);
1574 client_init_dispatch();
1577 * Set signal handlers, (e.g. to restore non-blocking mode)
1578 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1580 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1581 signal(SIGHUP, signal_handler);
1582 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1583 signal(SIGINT, signal_handler);
1584 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1585 signal(SIGQUIT, signal_handler);
1586 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1587 signal(SIGTERM, signal_handler);
1588 signal(SIGWINCH, window_change_handler);
1591 enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1594 session_ident = ssh2_chan_id;
1595 if (session_ident != -1) {
1596 if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1597 channel_register_filter(session_ident,
1598 client_simple_escape_filter, NULL,
1599 client_filter_cleanup,
1600 client_new_escape_filter_ctx(
1603 channel_register_cleanup(session_ident,
1604 client_channel_closed, 0);
1607 /* Check if we should immediately send eof on stdin. */
1608 client_check_initial_eof_on_stdin();
1611 /* Main loop of the client for the interactive session mode. */
1612 while (!quit_pending) {
1614 /* Process buffered packets sent by the server. */
1615 client_process_buffered_input_packets();
1617 if (compat20 && session_closed && !channel_still_open())
1620 if (ssh_packet_is_rekeying(active_state)) {
1621 debug("rekeying in progress");
1622 } else if (need_rekeying) {
1623 /* manual rekey request */
1624 debug("need rekeying");
1625 if ((r = kex_start_rekex(active_state)) != 0)
1626 fatal("%s: kex_start_rekex: %s", __func__,
1631 * Make packets of buffered stdin data, and buffer
1632 * them for sending to the server.
1635 client_make_packets_from_stdin_data();
1638 * Make packets from buffered channel data, and
1639 * enqueue them for sending to the server.
1641 if (packet_not_very_much_data_to_write())
1642 channel_output_poll();
1645 * Check if the window size has changed, and buffer a
1646 * message about it to the server if so.
1648 client_check_window_change();
1654 * Wait until we have something to do (something becomes
1655 * available on one of the descriptors).
1658 client_wait_until_can_do_something(&readset, &writeset,
1659 &max_fd2, &nalloc, ssh_packet_is_rekeying(active_state));
1664 /* Do channel operations unless rekeying in progress. */
1665 if (!ssh_packet_is_rekeying(active_state))
1666 channel_after_select(readset, writeset);
1668 /* Buffer input from the connection. */
1669 client_process_net_input(readset);
1675 /* Buffer data from stdin */
1676 client_process_input(readset);
1678 * Process output to stdout and stderr. Output to
1679 * the connection is processed elsewhere (above).
1681 client_process_output(writeset);
1685 * Send as much buffered packet data as possible to the
1688 if (FD_ISSET(connection_out, writeset))
1689 packet_write_poll();
1692 * If we are a backgrounded control master, and the
1693 * timeout has expired without any active client
1694 * connections, then quit.
1696 if (control_persist_exit_time > 0) {
1697 if (monotime() >= control_persist_exit_time) {
1698 debug("ControlPersist timeout expired");
1706 /* Terminate the session. */
1708 /* Stop watching for window change. */
1709 signal(SIGWINCH, SIG_DFL);
1712 packet_start(SSH2_MSG_DISCONNECT);
1713 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1714 packet_put_cstring("disconnected by user");
1715 packet_put_cstring(""); /* language tag */
1717 packet_write_wait();
1723 leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1725 /* restore blocking io */
1726 if (!isatty(fileno(stdin)))
1727 unset_nonblock(fileno(stdin));
1728 if (!isatty(fileno(stdout)))
1729 unset_nonblock(fileno(stdout));
1730 if (!isatty(fileno(stderr)))
1731 unset_nonblock(fileno(stderr));
1734 * If there was no shell or command requested, there will be no remote
1735 * exit status to be returned. In that case, clear error code if the
1736 * connection was deliberately terminated at this end.
1738 if (no_shell_flag && received_signal == SIGTERM) {
1739 received_signal = 0;
1743 if (received_signal)
1744 fatal("Killed by signal %d.", (int) received_signal);
1747 * In interactive mode (with pseudo tty) display a message indicating
1748 * that the connection has been closed.
1750 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1751 snprintf(buf, sizeof buf,
1752 "Connection to %.64s closed.\r\n", host);
1753 buffer_append(&stderr_buffer, buf, strlen(buf));
1756 /* Output any buffered data for stdout. */
1757 if (buffer_len(&stdout_buffer) > 0) {
1758 len = atomicio(vwrite, fileno(stdout),
1759 buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer));
1760 if (len < 0 || (u_int)len != buffer_len(&stdout_buffer))
1761 error("Write failed flushing stdout buffer.");
1763 buffer_consume(&stdout_buffer, len);
1766 /* Output any buffered data for stderr. */
1767 if (buffer_len(&stderr_buffer) > 0) {
1768 len = atomicio(vwrite, fileno(stderr),
1769 buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1770 if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1771 error("Write failed flushing stderr buffer.");
1773 buffer_consume(&stderr_buffer, len);
1776 /* Clear and free any buffers. */
1777 explicit_bzero(buf, sizeof(buf));
1778 buffer_free(&stdin_buffer);
1779 buffer_free(&stdout_buffer);
1780 buffer_free(&stderr_buffer);
1782 /* Report bytes transferred, and transfer rates. */
1783 total_time = get_current_time() - start_time;
1784 packet_get_bytes(&ibytes, &obytes);
1785 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1786 (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1788 verbose("Bytes per second: sent %.1f, received %.1f",
1789 obytes / total_time, ibytes / total_time);
1790 /* Return the exit status of the program. */
1791 debug("Exit status %d", exit_status);
1798 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1801 char *data = packet_get_string(&data_len);
1803 buffer_append(&stdout_buffer, data, data_len);
1804 explicit_bzero(data, data_len);
1809 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1812 char *data = packet_get_string(&data_len);
1814 buffer_append(&stderr_buffer, data, data_len);
1815 explicit_bzero(data, data_len);
1820 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1822 exit_status = packet_get_int();
1824 /* Acknowledge the exit. */
1825 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1828 * Must wait for packet to be sent since we are
1831 packet_write_wait();
1832 /* Flag that we want to exit. */
1838 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1841 int r, remote_id, sock;
1843 /* Read the remote channel number from the message. */
1844 remote_id = packet_get_int();
1848 * Get a connection to the local authentication agent (this may again
1851 if ((r = ssh_get_authentication_socket(&sock)) != 0 &&
1852 r != SSH_ERR_AGENT_NOT_PRESENT)
1853 debug("%s: ssh_get_authentication_socket: %s",
1854 __func__, ssh_err(r));
1858 * If we could not connect the agent, send an error message back to
1859 * the server. This should never happen unless the agent dies,
1860 * because authentication forwarding is only enabled if we have an
1864 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1865 -1, 0, 0, 0, "authentication agent connection", 1);
1866 c->remote_id = remote_id;
1870 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1871 packet_put_int(remote_id);
1873 /* Send a confirmation to the remote host. */
1874 debug("Forwarding authentication connection.");
1875 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1876 packet_put_int(remote_id);
1877 packet_put_int(c->self);
1884 client_request_forwarded_tcpip(const char *request_type, int rchan)
1887 char *listen_address, *originator_address;
1888 u_short listen_port, originator_port;
1890 /* Get rest of the packet */
1891 listen_address = packet_get_string(NULL);
1892 listen_port = packet_get_int();
1893 originator_address = packet_get_string(NULL);
1894 originator_port = packet_get_int();
1897 debug("%s: listen %s port %d, originator %s port %d", __func__,
1898 listen_address, listen_port, originator_address, originator_port);
1900 c = channel_connect_by_listen_address(listen_address, listen_port,
1901 "forwarded-tcpip", originator_address);
1903 free(originator_address);
1904 free(listen_address);
1909 client_request_forwarded_streamlocal(const char *request_type, int rchan)
1914 /* Get the remote path. */
1915 listen_path = packet_get_string(NULL);
1916 /* XXX: Skip reserved field for now. */
1917 if (packet_get_string_ptr(NULL) == NULL)
1918 fatal("%s: packet_get_string_ptr failed", __func__);
1921 debug("%s: %s", __func__, listen_path);
1923 c = channel_connect_by_listen_path(listen_path,
1924 "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1930 client_request_x11(const char *request_type, int rchan)
1934 u_short originator_port;
1937 if (!options.forward_x11) {
1938 error("Warning: ssh server tried X11 forwarding.");
1939 error("Warning: this is probably a break-in attempt by a "
1940 "malicious server.");
1943 if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1944 verbose("Rejected X11 connection after ForwardX11Timeout "
1948 originator = packet_get_string(NULL);
1949 if (datafellows & SSH_BUG_X11FWD) {
1950 debug2("buggy server: x11 request w/o originator_port");
1951 originator_port = 0;
1953 originator_port = packet_get_int();
1956 /* XXX check permission */
1957 debug("client_request_x11: request from %s %d", originator,
1960 sock = x11_connect_display();
1963 c = channel_new("x11",
1964 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1965 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1971 client_request_agent(const char *request_type, int rchan)
1976 if (!options.forward_agent) {
1977 error("Warning: ssh server tried agent forwarding.");
1978 error("Warning: this is probably a break-in attempt by a "
1979 "malicious server.");
1982 if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1983 if (r != SSH_ERR_AGENT_NOT_PRESENT)
1984 debug("%s: ssh_get_authentication_socket: %s",
1985 __func__, ssh_err(r));
1988 c = channel_new("authentication agent connection",
1989 SSH_CHANNEL_OPEN, sock, sock, -1,
1990 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1991 "authentication agent connection", 1);
1997 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
2002 if (tun_mode == SSH_TUNMODE_NO)
2006 error("Tunnel forwarding is not supported for protocol 1");
2010 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
2012 /* Open local tunnel device */
2013 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
2014 error("Tunnel device open failed.");
2018 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
2019 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
2022 #if defined(SSH_TUN_FILTER)
2023 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
2024 channel_register_filter(c->self, sys_tun_infilter,
2025 sys_tun_outfilter, NULL, NULL);
2028 packet_start(SSH2_MSG_CHANNEL_OPEN);
2029 packet_put_cstring("tun@openssh.com");
2030 packet_put_int(c->self);
2031 packet_put_int(c->local_window_max);
2032 packet_put_int(c->local_maxpacket);
2033 packet_put_int(tun_mode);
2034 packet_put_int(remote_tun);
2040 /* XXXX move to generic input handler */
2042 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
2047 u_int rmaxpack, rwindow, len;
2049 ctype = packet_get_string(&len);
2050 rchan = packet_get_int();
2051 rwindow = packet_get_int();
2052 rmaxpack = packet_get_int();
2054 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
2055 ctype, rchan, rwindow, rmaxpack);
2057 if (strcmp(ctype, "forwarded-tcpip") == 0) {
2058 c = client_request_forwarded_tcpip(ctype, rchan);
2059 } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
2060 c = client_request_forwarded_streamlocal(ctype, rchan);
2061 } else if (strcmp(ctype, "x11") == 0) {
2062 c = client_request_x11(ctype, rchan);
2063 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
2064 c = client_request_agent(ctype, rchan);
2066 /* XXX duplicate : */
2068 debug("confirm %s", ctype);
2069 c->remote_id = rchan;
2070 c->remote_window = rwindow;
2071 c->remote_maxpacket = rmaxpack;
2072 if (c->type != SSH_CHANNEL_CONNECTING) {
2073 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
2074 packet_put_int(c->remote_id);
2075 packet_put_int(c->self);
2076 packet_put_int(c->local_window);
2077 packet_put_int(c->local_maxpacket);
2081 debug("failure %s", ctype);
2082 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
2083 packet_put_int(rchan);
2084 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
2085 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
2086 packet_put_cstring("open failed");
2087 packet_put_cstring("");
2096 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
2099 int exitval, id, reply, success = 0;
2102 id = packet_get_int();
2103 rtype = packet_get_string(NULL);
2104 reply = packet_get_char();
2106 debug("client_input_channel_req: channel %d rtype %s reply %d",
2110 error("client_input_channel_req: request for channel -1");
2111 } else if ((c = channel_lookup(id)) == NULL) {
2112 error("client_input_channel_req: channel %d: "
2113 "unknown channel", id);
2114 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
2117 } else if (strcmp(rtype, "exit-status") == 0) {
2118 exitval = packet_get_int();
2119 if (c->ctl_chan != -1) {
2120 mux_exit_message(c, exitval);
2122 } else if (id == session_ident) {
2123 /* Record exit value of local session */
2125 exit_status = exitval;
2127 /* Probably for a mux channel that has already closed */
2128 debug("%s: no sink for exit-status on channel %d",
2133 if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
2134 packet_start(success ?
2135 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
2136 packet_put_int(c->remote_id);
2143 struct hostkeys_update_ctx {
2144 /* The hostname and (optionally) IP address string for the server */
2145 char *host_str, *ip_str;
2148 * Keys received from the server and a flag for each indicating
2149 * whether they already exist in known_hosts.
2150 * keys_seen is filled in by hostkeys_find() and later (for new
2151 * keys) by client_global_hostkeys_private_confirm().
2153 struct sshkey **keys;
2160 * Keys that are in known_hosts, but were not present in the update
2161 * from the server (i.e. scheduled to be deleted).
2162 * Filled in by hostkeys_find().
2164 struct sshkey **old_keys;
2169 hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
2175 for (i = 0; i < ctx->nkeys; i++)
2176 sshkey_free(ctx->keys[i]);
2178 free(ctx->keys_seen);
2179 for (i = 0; i < ctx->nold; i++)
2180 sshkey_free(ctx->old_keys[i]);
2181 free(ctx->old_keys);
2182 free(ctx->host_str);
2188 hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
2190 struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2192 struct sshkey **tmp;
2194 if (l->status != HKF_STATUS_MATCHED || l->key == NULL ||
2195 l->key->type == KEY_RSA1)
2198 /* Mark off keys we've already seen for this host */
2199 for (i = 0; i < ctx->nkeys; i++) {
2200 if (sshkey_equal(l->key, ctx->keys[i])) {
2201 debug3("%s: found %s key at %s:%ld", __func__,
2202 sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
2203 ctx->keys_seen[i] = 1;
2207 /* This line contained a key that not offered by the server */
2208 debug3("%s: deprecated %s key at %s:%ld", __func__,
2209 sshkey_ssh_name(l->key), l->path, l->linenum);
2210 if ((tmp = reallocarray(ctx->old_keys, ctx->nold + 1,
2211 sizeof(*ctx->old_keys))) == NULL)
2212 fatal("%s: reallocarray failed nold = %zu",
2213 __func__, ctx->nold);
2214 ctx->old_keys = tmp;
2215 ctx->old_keys[ctx->nold++] = l->key;
2222 update_known_hosts(struct hostkeys_update_ctx *ctx)
2225 int loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
2226 SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
2227 char *fp, *response;
2230 for (i = 0; i < ctx->nkeys; i++) {
2231 if (ctx->keys_seen[i] != 2)
2233 if ((fp = sshkey_fingerprint(ctx->keys[i],
2234 options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2235 fatal("%s: sshkey_fingerprint failed", __func__);
2236 do_log2(loglevel, "Learned new hostkey: %s %s",
2237 sshkey_type(ctx->keys[i]), fp);
2240 for (i = 0; i < ctx->nold; i++) {
2241 if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2242 options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2243 fatal("%s: sshkey_fingerprint failed", __func__);
2244 do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2245 sshkey_type(ctx->old_keys[i]), fp);
2248 if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
2249 if (get_saved_tio() != NULL) {
2254 for (i = 0; !quit_pending && i < 3; i++) {
2256 response = read_passphrase("Accept updated hostkeys? "
2257 "(yes/no): ", RP_ECHO);
2258 if (strcasecmp(response, "yes") == 0)
2260 else if (quit_pending || response == NULL ||
2261 strcasecmp(response, "no") == 0) {
2262 options.update_hostkeys = 0;
2265 do_log2(loglevel, "Please enter "
2266 "\"yes\" or \"no\"");
2269 if (quit_pending || i >= 3 || response == NULL)
2270 options.update_hostkeys = 0;
2277 * Now that all the keys are verified, we can go ahead and replace
2278 * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2279 * cancel the operation).
2281 if (options.update_hostkeys != 0 &&
2282 (r = hostfile_replace_entries(options.user_hostfiles[0],
2283 ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
2284 options.hash_known_hosts, 0,
2285 options.fingerprint_hash)) != 0)
2286 error("%s: hostfile_replace_entries failed: %s",
2287 __func__, ssh_err(r));
2291 client_global_hostkeys_private_confirm(int type, u_int32_t seq, void *_ctx)
2293 struct ssh *ssh = active_state; /* XXX */
2294 struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2296 struct sshbuf *signdata;
2302 fatal("%s: ctx->nnew == 0", __func__); /* sanity */
2303 if (type != SSH2_MSG_REQUEST_SUCCESS) {
2304 error("Server failed to confirm ownership of "
2305 "private host keys");
2306 hostkeys_update_ctx_free(ctx);
2309 if ((signdata = sshbuf_new()) == NULL)
2310 fatal("%s: sshbuf_new failed", __func__);
2311 /* Don't want to accidentally accept an unbound signature */
2312 if (ssh->kex->session_id_len == 0)
2313 fatal("%s: ssh->kex->session_id_len == 0", __func__);
2315 * Expect a signature for each of the ctx->nnew private keys we
2316 * haven't seen before. They will be in the same order as the
2317 * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
2319 for (ndone = i = 0; i < ctx->nkeys; i++) {
2320 if (ctx->keys_seen[i])
2322 /* Prepare data to be signed: session ID, unique string, key */
2323 sshbuf_reset(signdata);
2324 if ( (r = sshbuf_put_cstring(signdata,
2325 "hostkeys-prove-00@openssh.com")) != 0 ||
2326 (r = sshbuf_put_string(signdata, ssh->kex->session_id,
2327 ssh->kex->session_id_len)) != 0 ||
2328 (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
2329 fatal("%s: failed to prepare signature: %s",
2330 __func__, ssh_err(r));
2331 /* Extract and verify signature */
2332 if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
2333 error("%s: couldn't parse message: %s",
2334 __func__, ssh_err(r));
2337 if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
2338 sshbuf_ptr(signdata), sshbuf_len(signdata), 0)) != 0) {
2339 error("%s: server gave bad signature for %s key %zu",
2340 __func__, sshkey_type(ctx->keys[i]), i);
2343 /* Key is good. Mark it as 'seen' */
2344 ctx->keys_seen[i] = 2;
2347 if (ndone != ctx->nnew)
2348 fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
2349 ndone, ctx->nnew); /* Shouldn't happen */
2350 ssh_packet_check_eom(ssh);
2352 /* Make the edits to known_hosts */
2353 update_known_hosts(ctx);
2355 hostkeys_update_ctx_free(ctx);
2359 * Handle hostkeys-00@openssh.com global request to inform the client of all
2360 * the server's hostkeys. The keys are checked against the user's
2361 * HostkeyAlgorithms preference before they are accepted.
2364 client_input_hostkeys(void)
2366 struct ssh *ssh = active_state; /* XXX */
2367 const u_char *blob = NULL;
2369 struct sshbuf *buf = NULL;
2370 struct sshkey *key = NULL, **tmp;
2373 static int hostkeys_seen = 0; /* XXX use struct ssh */
2374 extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
2375 struct hostkeys_update_ctx *ctx = NULL;
2378 fatal("%s: server already sent hostkeys", __func__);
2379 if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2381 return 1; /* won't ask in batchmode, so don't even try */
2382 if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2385 ctx = xcalloc(1, sizeof(*ctx));
2386 while (ssh_packet_remaining(ssh) > 0) {
2389 if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
2390 error("%s: couldn't parse message: %s",
2391 __func__, ssh_err(r));
2394 if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2395 error("%s: parse key: %s", __func__, ssh_err(r));
2398 fp = sshkey_fingerprint(key, options.fingerprint_hash,
2400 debug3("%s: received %s key %s", __func__,
2401 sshkey_type(key), fp);
2404 /* Check that the key is accepted in HostkeyAlgorithms */
2405 if (match_pattern_list(sshkey_ssh_name(key),
2406 options.hostkeyalgorithms ? options.hostkeyalgorithms :
2407 KEX_DEFAULT_PK_ALG, 0) != 1) {
2408 debug3("%s: %s key not permitted by HostkeyAlgorithms",
2409 __func__, sshkey_ssh_name(key));
2413 if (sshkey_is_cert(key)) {
2414 debug3("%s: %s key is a certificate; skipping",
2415 __func__, sshkey_ssh_name(key));
2418 /* Ensure keys are unique */
2419 for (i = 0; i < ctx->nkeys; i++) {
2420 if (sshkey_equal(key, ctx->keys[i])) {
2421 error("%s: received duplicated %s host key",
2422 __func__, sshkey_ssh_name(key));
2426 /* Key is good, record it */
2427 if ((tmp = reallocarray(ctx->keys, ctx->nkeys + 1,
2428 sizeof(*ctx->keys))) == NULL)
2429 fatal("%s: reallocarray failed nkeys = %zu",
2430 __func__, ctx->nkeys);
2432 ctx->keys[ctx->nkeys++] = key;
2436 if (ctx->nkeys == 0) {
2437 debug("%s: server sent no hostkeys", __func__);
2441 if ((ctx->keys_seen = calloc(ctx->nkeys,
2442 sizeof(*ctx->keys_seen))) == NULL)
2443 fatal("%s: calloc failed", __func__);
2445 get_hostfile_hostname_ipaddr(host,
2446 options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
2447 options.port, &ctx->host_str,
2448 options.check_host_ip ? &ctx->ip_str : NULL);
2450 /* Find which keys we already know about. */
2451 if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2452 ctx, ctx->host_str, ctx->ip_str,
2453 HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2454 error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
2458 /* Figure out if we have any new keys to add */
2460 for (i = 0; i < ctx->nkeys; i++) {
2461 if (!ctx->keys_seen[i])
2465 debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2466 __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2468 if (ctx->nnew == 0 && ctx->nold != 0) {
2469 /* We have some keys to remove. Just do it. */
2470 update_known_hosts(ctx);
2471 } else if (ctx->nnew != 0) {
2473 * We have received hitherto-unseen keys from the server.
2474 * Ask the server to confirm ownership of the private halves.
2476 debug3("%s: asking server to prove ownership for %zu keys",
2477 __func__, ctx->nnew);
2478 if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2479 (r = sshpkt_put_cstring(ssh,
2480 "hostkeys-prove-00@openssh.com")) != 0 ||
2481 (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2482 fatal("%s: cannot prepare packet: %s",
2483 __func__, ssh_err(r));
2484 if ((buf = sshbuf_new()) == NULL)
2485 fatal("%s: sshbuf_new", __func__);
2486 for (i = 0; i < ctx->nkeys; i++) {
2487 if (ctx->keys_seen[i])
2490 if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2491 fatal("%s: sshkey_putb: %s",
2492 __func__, ssh_err(r));
2493 if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2494 fatal("%s: sshpkt_put_string: %s",
2495 __func__, ssh_err(r));
2497 if ((r = sshpkt_send(ssh)) != 0)
2498 fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2499 client_register_global_confirm(
2500 client_global_hostkeys_private_confirm, ctx);
2501 ctx = NULL; /* will be freed in callback */
2506 hostkeys_update_ctx_free(ctx);
2510 * NB. Return success for all cases. The server doesn't need to know
2511 * what the client does with its hosts file.
2517 client_input_global_request(int type, u_int32_t seq, void *ctxt)
2523 rtype = packet_get_cstring(NULL);
2524 want_reply = packet_get_char();
2525 debug("client_input_global_request: rtype %s want_reply %d",
2527 if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
2528 success = client_input_hostkeys();
2530 packet_start(success ?
2531 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2533 packet_write_wait();
2540 client_session2_setup(int id, int want_tty, int want_subsystem,
2541 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
2546 debug2("%s: id %d", __func__, id);
2548 if ((c = channel_lookup(id)) == NULL)
2549 fatal("client_session2_setup: channel %d: unknown channel", id);
2551 packet_set_interactive(want_tty,
2552 options.ip_qos_interactive, options.ip_qos_bulk);
2557 /* Store window size in the packet. */
2558 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2559 memset(&ws, 0, sizeof(ws));
2561 channel_request_start(id, "pty-req", 1);
2562 client_expect_confirm(id, "PTY allocation", CONFIRM_TTY);
2563 packet_put_cstring(term != NULL ? term : "");
2564 packet_put_int((u_int)ws.ws_col);
2565 packet_put_int((u_int)ws.ws_row);
2566 packet_put_int((u_int)ws.ws_xpixel);
2567 packet_put_int((u_int)ws.ws_ypixel);
2569 tiop = get_saved_tio();
2570 tty_make_modes(-1, tiop);
2572 /* XXX wait for reply */
2576 /* Transfer any environment variables from client to server */
2577 if (options.num_send_env != 0 && env != NULL) {
2581 debug("Sending environment.");
2582 for (i = 0; env[i] != NULL; i++) {
2584 name = xstrdup(env[i]);
2585 if ((val = strchr(name, '=')) == NULL) {
2592 for (j = 0; j < options.num_send_env; j++) {
2593 if (match_pattern(name, options.send_env[j])) {
2599 debug3("Ignored env %s", name);
2604 debug("Sending env %s = %s", name, val);
2605 channel_request_start(id, "env", 0);
2606 packet_put_cstring(name);
2607 packet_put_cstring(val);
2613 len = buffer_len(cmd);
2617 if (want_subsystem) {
2618 debug("Sending subsystem: %.*s",
2619 len, (u_char*)buffer_ptr(cmd));
2620 channel_request_start(id, "subsystem", 1);
2621 client_expect_confirm(id, "subsystem", CONFIRM_CLOSE);
2623 debug("Sending command: %.*s",
2624 len, (u_char*)buffer_ptr(cmd));
2625 channel_request_start(id, "exec", 1);
2626 client_expect_confirm(id, "exec", CONFIRM_CLOSE);
2628 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2631 channel_request_start(id, "shell", 1);
2632 client_expect_confirm(id, "shell", CONFIRM_CLOSE);
2638 client_init_dispatch_20(void)
2640 dispatch_init(&dispatch_protocol_error);
2642 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2643 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2644 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2645 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2646 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2647 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2648 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2649 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2650 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2651 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2652 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2653 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2656 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2658 /* global request reply messages */
2659 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2660 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2664 client_init_dispatch_13(void)
2666 dispatch_init(NULL);
2667 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2668 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2669 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2670 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2671 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2672 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2673 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2674 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2675 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2677 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2678 &client_input_agent_open : &deny_input_open);
2679 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2680 &x11_input_open : &deny_input_open);
2684 client_init_dispatch_15(void)
2686 client_init_dispatch_13();
2687 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2688 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2692 client_init_dispatch(void)
2695 client_init_dispatch_20();
2697 client_init_dispatch_13();
2699 client_init_dispatch_15();
2703 client_stop_mux(void)
2705 if (options.control_path != NULL && muxserver_sock != -1)
2706 unlink(options.control_path);
2708 * If we are in persist mode, or don't have a shell, signal that we
2709 * should close when all active channels are closed.
2711 if (options.control_persist || no_shell_flag) {
2713 setproctitle("[stopped mux]");
2717 /* client specific fatal cleanup */
2721 leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
2722 leave_non_blocking();
2723 if (options.control_path != NULL && muxserver_sock != -1)
2724 unlink(options.control_path);
2725 ssh_kill_proxy_command();