1 /* $OpenBSD: clientloop.c,v 1.231 2011/01/16 12:05:59 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/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>
89 #include "openbsd-compat/sys-queue.h"
103 #include "readconf.h"
104 #include "clientloop.h"
105 #include "sshconnect.h"
107 #include "atomicio.h"
119 extern Options options;
121 /* Flag indicating that stdin should be redirected from /dev/null. */
122 extern int stdin_null_flag;
124 /* Flag indicating that no shell has been requested */
125 extern int no_shell_flag;
128 extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
131 * Name of the host we are connecting to. This is the name given on the
132 * command line, or the HostName specified for the user-supplied name in a
133 * configuration file.
137 /* Force TTY allocation */
138 extern int force_tty_flag;
141 * Flag to indicate that we have received a window change signal which has
142 * not yet been processed. This will cause a message indicating the new
143 * window size to be sent to the server a little later. This is volatile
144 * because this is updated in a signal handler.
146 static volatile sig_atomic_t received_window_change_signal = 0;
147 static volatile sig_atomic_t received_signal = 0;
149 /* Flag indicating whether the user's terminal is in non-blocking mode. */
150 static int in_non_blocking_mode = 0;
152 /* Time when backgrounded control master using ControlPersist should exit */
153 static time_t control_persist_exit_time = 0;
155 /* Common data for the client loop code. */
156 volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
157 static int escape_char1; /* Escape character. (proto1 only) */
158 static int escape_pending1; /* Last character was an escape (proto1 only) */
159 static int last_was_cr; /* Last character was a newline. */
160 static int exit_status; /* Used to store the command exit status. */
161 static int stdin_eof; /* EOF has been encountered on stderr. */
162 static Buffer stdin_buffer; /* Buffer for stdin data. */
163 static Buffer stdout_buffer; /* Buffer for stdout data. */
164 static Buffer stderr_buffer; /* Buffer for stderr data. */
165 static u_int buffer_high; /* Soft max buffer size. */
166 static int connection_in; /* Connection to server (input). */
167 static int connection_out; /* Connection to server (output). */
168 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
169 static int session_closed; /* In SSH2: login session closed. */
170 static int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
172 static void client_init_dispatch(void);
173 int session_ident = -1;
175 int session_resumed = 0;
177 /* Track escape per proto2 channel */
178 struct escape_filter_ctx {
183 /* Context for channel confirmation replies */
184 struct channel_reply_ctx {
185 const char *request_type;
189 /* Global request success/failure callbacks */
190 struct global_confirm {
191 TAILQ_ENTRY(global_confirm) entry;
192 global_confirm_cb *cb;
196 TAILQ_HEAD(global_confirms, global_confirm);
197 static struct global_confirms global_confirms =
198 TAILQ_HEAD_INITIALIZER(global_confirms);
203 void ssh_process_session2_setup(int, int, int, Buffer *);
205 /* Restores stdin to blocking mode. */
208 leave_non_blocking(void)
210 if (in_non_blocking_mode) {
211 unset_nonblock(fileno(stdin));
212 in_non_blocking_mode = 0;
216 /* Puts stdin terminal in non-blocking mode. */
219 enter_non_blocking(void)
221 in_non_blocking_mode = 1;
222 set_nonblock(fileno(stdin));
226 * Signal handler for the window change signal (SIGWINCH). This just sets a
227 * flag indicating that the window has changed.
231 window_change_handler(int sig)
233 received_window_change_signal = 1;
234 signal(SIGWINCH, window_change_handler);
238 * Signal handler for signals that cause the program to terminate. These
239 * signals must be trapped to restore terminal modes.
243 signal_handler(int sig)
245 received_signal = sig;
250 * Returns current time in seconds from Jan 1, 1970 with the maximum
251 * available resolution.
255 get_current_time(void)
258 gettimeofday(&tv, NULL);
259 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
263 * Sets control_persist_exit_time to the absolute time when the
264 * backgrounded control master should exit due to expiry of the
265 * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
266 * control master process, or if there is no ControlPersist timeout.
269 set_control_persist_exit_time(void)
271 if (muxserver_sock == -1 || !options.control_persist
272 || options.control_persist_timeout == 0)
273 /* not using a ControlPersist timeout */
274 control_persist_exit_time = 0;
275 else if (channel_still_open()) {
276 /* some client connections are still open */
277 if (control_persist_exit_time > 0)
278 debug2("%s: cancel scheduled exit", __func__);
279 control_persist_exit_time = 0;
280 } else if (control_persist_exit_time <= 0) {
281 /* a client connection has recently closed */
282 control_persist_exit_time = time(NULL) +
283 (time_t)options.control_persist_timeout;
284 debug2("%s: schedule exit in %d seconds", __func__,
285 options.control_persist_timeout);
287 /* else we are already counting down to the timeout */
290 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
292 client_x11_get_proto(const char *display, const char *xauth_path,
293 u_int trusted, u_int timeout, char **_proto, char **_data)
298 static char proto[512], data[512];
300 int got_data = 0, generated = 0, do_unlink = 0, i;
301 char *xauthdir, *xauthfile;
305 xauthdir = xauthfile = NULL;
308 proto[0] = data[0] = '\0';
310 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
311 debug("No xauth program.");
313 if (display == NULL) {
314 debug("x11_get_proto: DISPLAY not set");
318 * Handle FamilyLocal case where $DISPLAY does
319 * not match an authorization entry. For this we
320 * just try "xauth list unix:displaynum.screennum".
321 * XXX: "localhost" match to determine FamilyLocal
324 if (strncmp(display, "localhost:", 10) == 0) {
325 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
330 xauthdir = xmalloc(MAXPATHLEN);
331 xauthfile = xmalloc(MAXPATHLEN);
332 mktemp_proto(xauthdir, MAXPATHLEN);
333 if (mkdtemp(xauthdir) != NULL) {
335 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
337 snprintf(cmd, sizeof(cmd),
338 "%s -f %s generate %s " SSH_X11_PROTO
339 " untrusted timeout %u 2>" _PATH_DEVNULL,
340 xauth_path, xauthfile, display, timeout);
341 debug2("x11_get_proto: %s", cmd);
342 if (system(cmd) == 0)
344 if (x11_refuse_time == 0) {
345 now = time(NULL) + 1;
346 if (UINT_MAX - timeout < now)
347 x11_refuse_time = UINT_MAX;
349 x11_refuse_time = now + timeout;
355 * When in untrusted mode, we read the cookie only if it was
356 * successfully generated as an untrusted one in the step
359 if (trusted || generated) {
360 snprintf(cmd, sizeof(cmd),
361 "%s %s%s list %s 2>" _PATH_DEVNULL,
363 generated ? "-f " : "" ,
364 generated ? xauthfile : "",
366 debug2("x11_get_proto: %s", cmd);
368 if (f && fgets(line, sizeof(line), f) &&
369 sscanf(line, "%*s %511s %511s", proto, data) == 2)
374 error("Warning: untrusted X11 forwarding setup failed: "
375 "xauth key data not generated");
388 * If we didn't get authentication data, just make up some
389 * data. The forwarding code will check the validity of the
390 * response anyway, and substitute this data. The X11
391 * server, however, will ignore this fake data and use
392 * whatever authentication mechanisms it was using otherwise
393 * for the local connection.
398 logit("Warning: No xauth data; "
399 "using fake authentication data for X11 forwarding.");
400 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
401 for (i = 0; i < 16; i++) {
404 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
412 * This is called when the interactive is entered. This checks if there is
413 * an EOF coming on stdin. We must check this explicitly, as select() does
414 * not appear to wake up when redirecting from /dev/null.
418 client_check_initial_eof_on_stdin(void)
424 * If standard input is to be "redirected from /dev/null", we simply
425 * mark that we have seen an EOF and send an EOF message to the
426 * server. Otherwise, we try to read a single character; it appears
427 * that for some files, such /dev/null, select() never wakes up for
428 * read for this descriptor, which means that we never get EOF. This
429 * way we will get the EOF if stdin comes from /dev/null or similar.
431 if (stdin_null_flag) {
432 /* Fake EOF on stdin. */
433 debug("Sending eof.");
435 packet_start(SSH_CMSG_EOF);
438 enter_non_blocking();
440 /* Check for immediate EOF on stdin. */
441 len = read(fileno(stdin), buf, 1);
444 * EOF. Record that we have seen it and send
447 debug("Sending eof.");
449 packet_start(SSH_CMSG_EOF);
451 } else if (len > 0) {
453 * Got data. We must store the data in the buffer,
454 * and also process it as an escape character if
457 if ((u_char) buf[0] == escape_char1)
460 buffer_append(&stdin_buffer, buf, 1);
462 leave_non_blocking();
468 * Make packets from buffered stdin data, and buffer them for sending to the
473 client_make_packets_from_stdin_data(void)
477 /* Send buffered stdin data to the server. */
478 while (buffer_len(&stdin_buffer) > 0 &&
479 packet_not_very_much_data_to_write()) {
480 len = buffer_len(&stdin_buffer);
481 /* Keep the packets at reasonable size. */
482 if (len > packet_get_maxsize())
483 len = packet_get_maxsize();
484 packet_start(SSH_CMSG_STDIN_DATA);
485 packet_put_string(buffer_ptr(&stdin_buffer), len);
487 buffer_consume(&stdin_buffer, len);
488 /* If we have a pending EOF, send it now. */
489 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
490 packet_start(SSH_CMSG_EOF);
497 * Checks if the client window has changed, and sends a packet about it to
498 * the server if so. The actual change is detected elsewhere (by a software
499 * interrupt on Unix); this just checks the flag and sends a message if
504 client_check_window_change(void)
508 if (! received_window_change_signal)
511 received_window_change_signal = 0;
513 debug2("client_check_window_change: changed");
516 channel_send_window_changes();
518 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
520 packet_start(SSH_CMSG_WINDOW_SIZE);
521 packet_put_int((u_int)ws.ws_row);
522 packet_put_int((u_int)ws.ws_col);
523 packet_put_int((u_int)ws.ws_xpixel);
524 packet_put_int((u_int)ws.ws_ypixel);
530 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
532 struct global_confirm *gc;
534 if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
537 gc->cb(type, seq, gc->ctx);
538 if (--gc->ref_count <= 0) {
539 TAILQ_REMOVE(&global_confirms, gc, entry);
540 bzero(gc, sizeof(*gc));
544 packet_set_alive_timeouts(0);
548 server_alive_check(void)
551 if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
552 logit("Timeout, server %s not responding.", host);
555 packet_start(SSH2_MSG_GLOBAL_REQUEST);
556 packet_put_cstring("keepalive@openssh.com");
557 packet_put_char(1); /* boolean: want reply */
559 /* Insert an empty placeholder to maintain ordering */
560 client_register_global_confirm(NULL, NULL);
562 packet_send_ignore(0);
568 * Waits until the client can do something (some data becomes available on
569 * one of the file descriptors).
572 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
573 int *maxfdp, u_int *nallocp, int rekeying)
575 struct timeval tv, *tvp;
579 /* Add any selections by the channel mechanism. */
580 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
583 /* Read from the connection, unless our buffers are full. */
584 if (buffer_len(&stdout_buffer) < buffer_high &&
585 buffer_len(&stderr_buffer) < buffer_high &&
586 channel_not_very_much_buffered_data())
587 FD_SET(connection_in, *readsetp);
589 * Read from stdin, unless we have seen EOF or have very much
590 * buffered data to send to the server.
592 if (!stdin_eof && packet_not_very_much_data_to_write())
593 FD_SET(fileno(stdin), *readsetp);
595 /* Select stdout/stderr if have data in buffer. */
596 if (buffer_len(&stdout_buffer) > 0)
597 FD_SET(fileno(stdout), *writesetp);
598 if (buffer_len(&stderr_buffer) > 0)
599 FD_SET(fileno(stderr), *writesetp);
601 /* channel_prepare_select could have closed the last channel */
602 if (session_closed && !channel_still_open() &&
603 !packet_have_data_to_write()) {
604 /* clear mask since we did not call select() */
605 memset(*readsetp, 0, *nallocp);
606 memset(*writesetp, 0, *nallocp);
609 FD_SET(connection_in, *readsetp);
613 /* Select server connection if have data to write to the server. */
614 if (packet_have_data_to_write())
615 FD_SET(connection_out, *writesetp);
618 * Wait for something to happen. This will suspend the process until
619 * some selected descriptor can be read, written, or has some other
620 * event pending, or a timeout expires.
623 timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
624 if (options.server_alive_interval > 0)
625 timeout_secs = options.server_alive_interval;
626 set_control_persist_exit_time();
627 if (control_persist_exit_time > 0) {
628 timeout_secs = MIN(timeout_secs,
629 control_persist_exit_time - time(NULL));
630 if (timeout_secs < 0)
633 if (timeout_secs == INT_MAX)
636 tv.tv_sec = timeout_secs;
641 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
646 * We have to clear the select masks, because we return.
647 * We have to return, because the mainloop checks for the flags
648 * set by the signal handlers.
650 memset(*readsetp, 0, *nallocp);
651 memset(*writesetp, 0, *nallocp);
655 /* Note: we might still have data in the buffers. */
656 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
657 buffer_append(&stderr_buffer, buf, strlen(buf));
660 server_alive_check();
664 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
666 /* Flush stdout and stderr buffers. */
667 if (buffer_len(bout) > 0)
668 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
670 if (buffer_len(berr) > 0)
671 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
674 leave_raw_mode(force_tty_flag);
677 * Free (and clear) the buffer to reduce the amount of data that gets
684 /* Send the suspend signal to the program itself. */
685 kill(getpid(), SIGTSTP);
687 /* Reset window sizes in case they have changed */
688 received_window_change_signal = 1;
690 /* OK, we have been continued by the user. Reinitialize buffers. */
695 enter_raw_mode(force_tty_flag);
699 client_process_net_input(fd_set *readset)
702 char buf[SSH_IOBUFSZ];
705 * Read input from the server, and add any such data to the buffer of
706 * the packet subsystem.
708 if (FD_ISSET(connection_in, readset)) {
709 /* Read as much as possible. */
710 len = roaming_read(connection_in, buf, sizeof(buf), &cont);
711 if (len == 0 && cont == 0) {
713 * Received EOF. The remote host has closed the
716 snprintf(buf, sizeof buf,
717 "Connection to %.300s closed by remote host.\r\n",
719 buffer_append(&stderr_buffer, buf, strlen(buf));
724 * There is a kernel bug on Solaris that causes select to
725 * sometimes wake up even though there is no data available.
728 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
733 * An error has encountered. Perhaps there is a
736 snprintf(buf, sizeof buf,
737 "Read from remote host %.300s: %.100s\r\n",
738 host, strerror(errno));
739 buffer_append(&stderr_buffer, buf, strlen(buf));
743 packet_process_incoming(buf, len);
748 client_status_confirm(int type, Channel *c, void *ctx)
750 struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
754 /* XXX supress on mux _client_ quietmode */
755 tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
756 c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
758 if (type == SSH2_MSG_CHANNEL_SUCCESS) {
759 debug2("%s request accepted on channel %d",
760 cr->request_type, c->self);
761 } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
763 snprintf(errmsg, sizeof(errmsg),
764 "%s request failed\r\n", cr->request_type);
766 snprintf(errmsg, sizeof(errmsg),
767 "%s request failed on channel %d",
768 cr->request_type, c->self);
770 /* If error occurred on primary session channel, then exit */
771 if (cr->do_close && c->self == session_ident)
773 /* If error occurred on mux client, append to their stderr */
775 buffer_append(&c->extended, errmsg, strlen(errmsg));
780 chan_write_failed(c);
787 client_abandon_status_confirm(Channel *c, void *ctx)
793 client_expect_confirm(int id, const char *request, int do_close)
795 struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
797 cr->request_type = request;
798 cr->do_close = do_close;
800 channel_register_status_confirm(id, client_status_confirm,
801 client_abandon_status_confirm, cr);
805 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
807 struct global_confirm *gc, *last_gc;
809 /* Coalesce identical callbacks */
810 last_gc = TAILQ_LAST(&global_confirms, global_confirms);
811 if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
812 if (++last_gc->ref_count >= INT_MAX)
813 fatal("%s: last_gc->ref_count = %d",
814 __func__, last_gc->ref_count);
818 gc = xmalloc(sizeof(*gc));
822 TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
826 process_cmdline(void)
828 void (*handler)(int);
829 char *s, *cmd, *cancel_host;
831 int local = 0, remote = 0, dynamic = 0;
835 bzero(&fwd, sizeof(fwd));
836 fwd.listen_host = fwd.connect_host = NULL;
838 leave_raw_mode(force_tty_flag);
839 handler = signal(SIGINT, SIG_IGN);
840 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
846 s++; /* Skip cmdline '-', if any */
850 if (*s == 'h' || *s == 'H' || *s == '?') {
852 logit(" -L[bind_address:]port:host:hostport "
853 "Request local forward");
854 logit(" -R[bind_address:]port:host:hostport "
855 "Request remote forward");
856 logit(" -D[bind_address:]port "
857 "Request dynamic forward");
858 logit(" -KR[bind_address:]port "
859 "Cancel remote forward");
860 if (!options.permit_local_command)
863 "Execute local command");
867 if (*s == '!' && options.permit_local_command) {
884 logit("Invalid command.");
888 if ((local || dynamic) && delete) {
889 logit("Not supported.");
892 if (remote && delete && !compat20) {
893 logit("Not supported for SSH protocol version 1.");
897 while (isspace(*++s))
900 /* XXX update list of forwards in options */
903 cancel_host = hpdelim(&s); /* may be NULL */
905 cancel_port = a2port(s);
906 cancel_host = cleanhostname(cancel_host);
908 cancel_port = a2port(cancel_host);
911 if (cancel_port <= 0) {
912 logit("Bad forwarding close port");
915 channel_request_rforward_cancel(cancel_host, cancel_port);
917 if (!parse_forward(&fwd, s, dynamic, remote)) {
918 logit("Bad forwarding specification.");
921 if (local || dynamic) {
922 if (channel_setup_local_fwd_listener(fwd.listen_host,
923 fwd.listen_port, fwd.connect_host,
924 fwd.connect_port, options.gateway_ports) < 0) {
925 logit("Port forwarding failed.");
929 if (channel_request_remote_forwarding(fwd.listen_host,
930 fwd.listen_port, fwd.connect_host,
931 fwd.connect_port) < 0) {
932 logit("Port forwarding failed.");
937 logit("Forwarding port.");
941 signal(SIGINT, handler);
942 enter_raw_mode(force_tty_flag);
945 if (fwd.listen_host != NULL)
946 xfree(fwd.listen_host);
947 if (fwd.connect_host != NULL)
948 xfree(fwd.connect_host);
952 * Process the characters one by one, call with c==NULL for proto1 case.
955 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
964 int *escape_pendingp, escape_char;
965 struct escape_filter_ctx *efc;
968 escape_pendingp = &escape_pending1;
969 escape_char = escape_char1;
971 if (c->filter_ctx == NULL)
973 efc = (struct escape_filter_ctx *)c->filter_ctx;
974 escape_pendingp = &efc->escape_pending;
975 escape_char = efc->escape_char;
981 for (i = 0; i < (u_int)len; i++) {
982 /* Get one character at a time. */
985 if (*escape_pendingp) {
986 /* We have previously seen an escape character. */
987 /* Clear the flag now. */
988 *escape_pendingp = 0;
990 /* Process the escaped character. */
993 /* Terminate the connection. */
994 snprintf(string, sizeof string, "%c.\r\n",
996 buffer_append(berr, string, strlen(string));
998 if (c && c->ctl_chan != -1) {
1000 chan_write_failed(c);
1007 /* XXX support this for mux clients */
1008 if (c && c->ctl_chan != -1) {
1010 snprintf(string, sizeof string,
1011 "%c%c escape not available to "
1012 "multiplexed sessions\r\n",
1014 buffer_append(berr, string,
1018 /* Suspend the program. Inform the user */
1019 snprintf(string, sizeof string,
1020 "%c^Z [suspend ssh]\r\n", escape_char);
1021 buffer_append(berr, string, strlen(string));
1023 /* Restore terminal modes and suspend. */
1024 client_suspend_self(bin, bout, berr);
1026 /* We have been continued. */
1031 snprintf(string, sizeof string,
1032 "%cB\r\n", escape_char);
1033 buffer_append(berr, string,
1035 channel_request_start(session_ident,
1037 packet_put_int(1000);
1044 if (datafellows & SSH_BUG_NOREKEY)
1045 logit("Server does not "
1046 "support re-keying");
1053 if (c && c->ctl_chan != -1)
1056 * Detach the program (continue to serve
1057 * connections, but put in background and no
1058 * more new connections).
1060 /* Restore tty modes. */
1061 leave_raw_mode(force_tty_flag);
1063 /* Stop listening for new connections. */
1064 channel_stop_listening();
1066 snprintf(string, sizeof string,
1067 "%c& [backgrounded]\n", escape_char);
1068 buffer_append(berr, string, strlen(string));
1070 /* Fork into background. */
1073 error("fork: %.100s", strerror(errno));
1076 if (pid != 0) { /* This is the parent. */
1077 /* The parent just exits. */
1080 /* The child continues serving connections. */
1082 buffer_append(bin, "\004", 1);
1083 /* fake EOF on stdin */
1085 } else if (!stdin_eof) {
1087 * Sending SSH_CMSG_EOF alone does not
1088 * always appear to be enough. So we
1089 * try to send an EOF character first.
1091 packet_start(SSH_CMSG_STDIN_DATA);
1092 packet_put_string("\004", 1);
1096 if (buffer_len(bin) == 0) {
1097 packet_start(SSH_CMSG_EOF);
1104 if (c && c->ctl_chan != -1) {
1105 snprintf(string, sizeof string,
1107 Supported escape sequences:\r\n\
1108 %c. - terminate session\r\n\
1109 %cB - send a BREAK to the remote system\r\n\
1110 %cR - Request rekey (SSH protocol 2 only)\r\n\
1111 %c# - list forwarded connections\r\n\
1112 %c? - this message\r\n\
1113 %c%c - send the escape character by typing it twice\r\n\
1114 (Note that escapes are only recognized immediately after newline.)\r\n",
1115 escape_char, escape_char,
1116 escape_char, escape_char,
1117 escape_char, escape_char,
1118 escape_char, escape_char);
1120 snprintf(string, sizeof string,
1122 Supported escape sequences:\r\n\
1123 %c. - terminate connection (and any multiplexed sessions)\r\n\
1124 %cB - send a BREAK to the remote system\r\n\
1125 %cC - open a command line\r\n\
1126 %cR - Request rekey (SSH protocol 2 only)\r\n\
1127 %c^Z - suspend ssh\r\n\
1128 %c# - list forwarded connections\r\n\
1129 %c& - background ssh (when waiting for connections to terminate)\r\n\
1130 %c? - this message\r\n\
1131 %c%c - send the escape character by typing it twice\r\n\
1132 (Note that escapes are only recognized immediately after newline.)\r\n",
1133 escape_char, escape_char,
1134 escape_char, escape_char,
1135 escape_char, escape_char,
1136 escape_char, escape_char,
1137 escape_char, escape_char,
1140 buffer_append(berr, string, strlen(string));
1144 snprintf(string, sizeof string, "%c#\r\n",
1146 buffer_append(berr, string, strlen(string));
1147 s = channel_open_message();
1148 buffer_append(berr, s, strlen(s));
1153 if (c && c->ctl_chan != -1)
1159 if (ch != escape_char) {
1160 buffer_put_char(bin, escape_char);
1163 /* Escaped characters fall through here */
1168 * The previous character was not an escape char.
1169 * Check if this is an escape.
1171 if (last_was_cr && ch == escape_char) {
1173 * It is. Set the flag and continue to
1176 *escape_pendingp = 1;
1182 * Normal character. Record whether it was a newline,
1183 * and append it to the buffer.
1185 last_was_cr = (ch == '\r' || ch == '\n');
1186 buffer_put_char(bin, ch);
1193 client_process_input(fd_set *readset)
1196 char buf[SSH_IOBUFSZ];
1198 /* Read input from stdin. */
1199 if (FD_ISSET(fileno(stdin), readset)) {
1200 /* Read as much as possible. */
1201 len = read(fileno(stdin), buf, sizeof(buf));
1203 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1204 return; /* we'll try again later */
1207 * Received EOF or error. They are treated
1208 * similarly, except that an error message is printed
1209 * if it was an error condition.
1212 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1214 buffer_append(&stderr_buffer, buf, strlen(buf));
1216 /* Mark that we have seen EOF. */
1219 * Send an EOF message to the server unless there is
1220 * data in the buffer. If there is data in the
1221 * buffer, no message will be sent now. Code
1222 * elsewhere will send the EOF when the buffer
1223 * becomes empty if stdin_eof is set.
1225 if (buffer_len(&stdin_buffer) == 0) {
1226 packet_start(SSH_CMSG_EOF);
1229 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1231 * Normal successful read, and no escape character.
1232 * Just append the data to buffer.
1234 buffer_append(&stdin_buffer, buf, len);
1237 * Normal, successful read. But we have an escape
1238 * character and have to process the characters one
1241 if (process_escapes(NULL, &stdin_buffer,
1242 &stdout_buffer, &stderr_buffer, buf, len) == -1)
1249 client_process_output(fd_set *writeset)
1254 /* Write buffered output to stdout. */
1255 if (FD_ISSET(fileno(stdout), writeset)) {
1256 /* Write as much data as possible. */
1257 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1258 buffer_len(&stdout_buffer));
1260 if (errno == EINTR || errno == EAGAIN ||
1261 errno == EWOULDBLOCK)
1265 * An error or EOF was encountered. Put an
1266 * error message to stderr buffer.
1268 snprintf(buf, sizeof buf,
1269 "write stdout: %.50s\r\n", strerror(errno));
1270 buffer_append(&stderr_buffer, buf, strlen(buf));
1275 /* Consume printed data from the buffer. */
1276 buffer_consume(&stdout_buffer, len);
1278 /* Write buffered output to stderr. */
1279 if (FD_ISSET(fileno(stderr), writeset)) {
1280 /* Write as much data as possible. */
1281 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1282 buffer_len(&stderr_buffer));
1284 if (errno == EINTR || errno == EAGAIN ||
1285 errno == EWOULDBLOCK)
1289 * EOF or error, but can't even print
1296 /* Consume printed characters from the buffer. */
1297 buffer_consume(&stderr_buffer, len);
1302 * Get packets from the connection input buffer, and process them as long as
1303 * there are packets available.
1305 * Any unknown packets received during the actual
1306 * session cause the session to terminate. This is
1307 * intended to make debugging easier since no
1308 * confirmations are sent. Any compatible protocol
1309 * extensions must be negotiated during the
1310 * preparatory phase.
1314 client_process_buffered_input_packets(void)
1316 dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1317 compat20 ? xxx_kex : NULL);
1320 /* scan buf[] for '~' before sending data to the peer */
1322 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1324 client_new_escape_filter_ctx(int escape_char)
1326 struct escape_filter_ctx *ret;
1328 ret = xmalloc(sizeof(*ret));
1329 ret->escape_pending = 0;
1330 ret->escape_char = escape_char;
1334 /* Free the escape filter context on channel free */
1336 client_filter_cleanup(int cid, void *ctx)
1342 client_simple_escape_filter(Channel *c, char *buf, int len)
1344 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1347 return process_escapes(c, &c->input, &c->output, &c->extended,
1352 client_channel_closed(int id, void *arg)
1354 channel_cancel_cleanup(id);
1356 leave_raw_mode(force_tty_flag);
1360 * Implements the interactive session with the server. This is called after
1361 * the user has been authenticated, and a command has been started on the
1362 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1363 * used as an escape character for terminating or suspending the session.
1367 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1369 fd_set *readset = NULL, *writeset = NULL;
1370 double start_time, total_time;
1371 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1372 u_int64_t ibytes, obytes;
1376 debug("Entering interactive session.");
1378 start_time = get_current_time();
1380 /* Initialize variables. */
1381 escape_pending1 = 0;
1385 buffer_high = 64 * 1024;
1386 connection_in = packet_get_connection_in();
1387 connection_out = packet_get_connection_out();
1388 max_fd = MAX(connection_in, connection_out);
1391 /* enable nonblocking unless tty */
1392 if (!isatty(fileno(stdin)))
1393 set_nonblock(fileno(stdin));
1394 if (!isatty(fileno(stdout)))
1395 set_nonblock(fileno(stdout));
1396 if (!isatty(fileno(stderr)))
1397 set_nonblock(fileno(stderr));
1398 max_fd = MAX(max_fd, fileno(stdin));
1399 max_fd = MAX(max_fd, fileno(stdout));
1400 max_fd = MAX(max_fd, fileno(stderr));
1403 escape_char1 = escape_char_arg;
1405 /* Initialize buffers. */
1406 buffer_init(&stdin_buffer);
1407 buffer_init(&stdout_buffer);
1408 buffer_init(&stderr_buffer);
1410 client_init_dispatch();
1413 * Set signal handlers, (e.g. to restore non-blocking mode)
1414 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1416 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1417 signal(SIGHUP, signal_handler);
1418 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1419 signal(SIGINT, signal_handler);
1420 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1421 signal(SIGQUIT, signal_handler);
1422 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1423 signal(SIGTERM, signal_handler);
1424 signal(SIGWINCH, window_change_handler);
1427 enter_raw_mode(force_tty_flag);
1430 session_ident = ssh2_chan_id;
1431 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1432 channel_register_filter(session_ident,
1433 client_simple_escape_filter, NULL,
1434 client_filter_cleanup,
1435 client_new_escape_filter_ctx(escape_char_arg));
1436 if (session_ident != -1)
1437 channel_register_cleanup(session_ident,
1438 client_channel_closed, 0);
1440 /* Check if we should immediately send eof on stdin. */
1441 client_check_initial_eof_on_stdin();
1444 /* Main loop of the client for the interactive session mode. */
1445 while (!quit_pending) {
1447 /* Process buffered packets sent by the server. */
1448 client_process_buffered_input_packets();
1450 if (compat20 && session_closed && !channel_still_open())
1453 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1456 debug("rekeying in progress");
1459 * Make packets of buffered stdin data, and buffer
1460 * them for sending to the server.
1463 client_make_packets_from_stdin_data();
1466 * Make packets from buffered channel data, and
1467 * enqueue them for sending to the server.
1469 if (packet_not_very_much_data_to_write())
1470 channel_output_poll();
1473 * Check if the window size has changed, and buffer a
1474 * message about it to the server if so.
1476 client_check_window_change();
1482 * Wait until we have something to do (something becomes
1483 * available on one of the descriptors).
1486 client_wait_until_can_do_something(&readset, &writeset,
1487 &max_fd2, &nalloc, rekeying);
1492 /* Do channel operations unless rekeying in progress. */
1494 channel_after_select(readset, writeset);
1497 if (options.gss_renewal_rekey &&
1498 ssh_gssapi_credentials_updated(GSS_C_NO_CONTEXT)) {
1499 debug("credentials updated - forcing rekey");
1504 if (need_rekeying || packet_need_rekeying()) {
1505 debug("need rekeying");
1507 kex_send_kexinit(xxx_kex);
1512 /* Buffer input from the connection. */
1513 client_process_net_input(readset);
1519 /* Buffer data from stdin */
1520 client_process_input(readset);
1522 * Process output to stdout and stderr. Output to
1523 * the connection is processed elsewhere (above).
1525 client_process_output(writeset);
1528 if (session_resumed) {
1529 connection_in = packet_get_connection_in();
1530 connection_out = packet_get_connection_out();
1531 max_fd = MAX(max_fd, connection_out);
1532 max_fd = MAX(max_fd, connection_in);
1533 session_resumed = 0;
1537 * Send as much buffered packet data as possible to the
1540 if (FD_ISSET(connection_out, writeset))
1541 packet_write_poll();
1544 * If we are a backgrounded control master, and the
1545 * timeout has expired without any active client
1546 * connections, then quit.
1548 if (control_persist_exit_time > 0) {
1549 if (time(NULL) >= control_persist_exit_time) {
1550 debug("ControlPersist timeout expired");
1560 /* Terminate the session. */
1562 /* Stop watching for window change. */
1563 signal(SIGWINCH, SIG_DFL);
1566 packet_start(SSH2_MSG_DISCONNECT);
1567 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1568 packet_put_cstring("disconnected by user");
1569 packet_put_cstring(""); /* language tag */
1571 packet_write_wait();
1577 leave_raw_mode(force_tty_flag);
1579 /* restore blocking io */
1580 if (!isatty(fileno(stdin)))
1581 unset_nonblock(fileno(stdin));
1582 if (!isatty(fileno(stdout)))
1583 unset_nonblock(fileno(stdout));
1584 if (!isatty(fileno(stderr)))
1585 unset_nonblock(fileno(stderr));
1588 * If there was no shell or command requested, there will be no remote
1589 * exit status to be returned. In that case, clear error code if the
1590 * connection was deliberately terminated at this end.
1592 if (no_shell_flag && received_signal == SIGTERM) {
1593 received_signal = 0;
1597 if (received_signal) {
1598 debug("Killed by signal %d.", (int) received_signal);
1599 cleanup_exit((int) received_signal + 128);
1603 * In interactive mode (with pseudo tty) display a message indicating
1604 * that the connection has been closed.
1606 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1607 snprintf(buf, sizeof buf,
1608 "Connection to %.64s closed.\r\n", host);
1609 buffer_append(&stderr_buffer, buf, strlen(buf));
1612 /* Output any buffered data for stdout. */
1613 if (buffer_len(&stdout_buffer) > 0) {
1614 len = atomicio(vwrite, fileno(stdout),
1615 buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer));
1616 if (len < 0 || (u_int)len != buffer_len(&stdout_buffer))
1617 error("Write failed flushing stdout buffer.");
1619 buffer_consume(&stdout_buffer, len);
1622 /* Output any buffered data for stderr. */
1623 if (buffer_len(&stderr_buffer) > 0) {
1624 len = atomicio(vwrite, fileno(stderr),
1625 buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1626 if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1627 error("Write failed flushing stderr buffer.");
1629 buffer_consume(&stderr_buffer, len);
1632 /* Clear and free any buffers. */
1633 memset(buf, 0, sizeof(buf));
1634 buffer_free(&stdin_buffer);
1635 buffer_free(&stdout_buffer);
1636 buffer_free(&stderr_buffer);
1638 /* Report bytes transferred, and transfer rates. */
1639 total_time = get_current_time() - start_time;
1640 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1641 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1642 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1643 (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1645 verbose("Bytes per second: sent %.1f, received %.1f",
1646 obytes / total_time, ibytes / total_time);
1647 /* Return the exit status of the program. */
1648 debug("Exit status %d", exit_status);
1655 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1658 char *data = packet_get_string(&data_len);
1660 buffer_append(&stdout_buffer, data, data_len);
1661 memset(data, 0, data_len);
1665 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1668 char *data = packet_get_string(&data_len);
1670 buffer_append(&stderr_buffer, data, data_len);
1671 memset(data, 0, data_len);
1675 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1677 exit_status = packet_get_int();
1679 /* Acknowledge the exit. */
1680 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1683 * Must wait for packet to be sent since we are
1686 packet_write_wait();
1687 /* Flag that we want to exit. */
1691 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1694 int remote_id, sock;
1696 /* Read the remote channel number from the message. */
1697 remote_id = packet_get_int();
1701 * Get a connection to the local authentication agent (this may again
1704 sock = ssh_get_authentication_socket();
1707 * If we could not connect the agent, send an error message back to
1708 * the server. This should never happen unless the agent dies,
1709 * because authentication forwarding is only enabled if we have an
1713 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1714 -1, 0, 0, 0, "authentication agent connection", 1);
1715 c->remote_id = remote_id;
1719 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1720 packet_put_int(remote_id);
1722 /* Send a confirmation to the remote host. */
1723 debug("Forwarding authentication connection.");
1724 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1725 packet_put_int(remote_id);
1726 packet_put_int(c->self);
1732 client_request_forwarded_tcpip(const char *request_type, int rchan)
1735 char *listen_address, *originator_address;
1736 u_short listen_port, originator_port;
1738 /* Get rest of the packet */
1739 listen_address = packet_get_string(NULL);
1740 listen_port = packet_get_int();
1741 originator_address = packet_get_string(NULL);
1742 originator_port = packet_get_int();
1745 debug("client_request_forwarded_tcpip: listen %s port %d, "
1746 "originator %s port %d", listen_address, listen_port,
1747 originator_address, originator_port);
1749 c = channel_connect_by_listen_address(listen_port,
1750 "forwarded-tcpip", originator_address);
1752 xfree(originator_address);
1753 xfree(listen_address);
1758 client_request_x11(const char *request_type, int rchan)
1762 u_short originator_port;
1765 if (!options.forward_x11) {
1766 error("Warning: ssh server tried X11 forwarding.");
1767 error("Warning: this is probably a break-in attempt by a "
1768 "malicious server.");
1771 if (x11_refuse_time != 0 && time(NULL) >= x11_refuse_time) {
1772 verbose("Rejected X11 connection after ForwardX11Timeout "
1776 originator = packet_get_string(NULL);
1777 if (datafellows & SSH_BUG_X11FWD) {
1778 debug2("buggy server: x11 request w/o originator_port");
1779 originator_port = 0;
1781 originator_port = packet_get_int();
1784 /* XXX check permission */
1785 debug("client_request_x11: request from %s %d", originator,
1788 sock = x11_connect_display();
1791 c = channel_new("x11",
1792 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1793 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1799 client_request_agent(const char *request_type, int rchan)
1804 if (!options.forward_agent) {
1805 error("Warning: ssh server tried agent forwarding.");
1806 error("Warning: this is probably a break-in attempt by a "
1807 "malicious server.");
1810 sock = ssh_get_authentication_socket();
1813 c = channel_new("authentication agent connection",
1814 SSH_CHANNEL_OPEN, sock, sock, -1,
1815 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1816 "authentication agent connection", 1);
1822 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1827 if (tun_mode == SSH_TUNMODE_NO)
1831 error("Tunnel forwarding is not supported for protocol 1");
1835 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1837 /* Open local tunnel device */
1838 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1839 error("Tunnel device open failed.");
1843 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1844 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1847 #if defined(SSH_TUN_FILTER)
1848 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1849 channel_register_filter(c->self, sys_tun_infilter,
1850 sys_tun_outfilter, NULL, NULL);
1853 packet_start(SSH2_MSG_CHANNEL_OPEN);
1854 packet_put_cstring("tun@openssh.com");
1855 packet_put_int(c->self);
1856 packet_put_int(c->local_window_max);
1857 packet_put_int(c->local_maxpacket);
1858 packet_put_int(tun_mode);
1859 packet_put_int(remote_tun);
1865 /* XXXX move to generic input handler */
1867 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1872 u_int rmaxpack, rwindow, len;
1874 ctype = packet_get_string(&len);
1875 rchan = packet_get_int();
1876 rwindow = packet_get_int();
1877 rmaxpack = packet_get_int();
1879 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1880 ctype, rchan, rwindow, rmaxpack);
1882 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1883 c = client_request_forwarded_tcpip(ctype, rchan);
1884 } else if (strcmp(ctype, "x11") == 0) {
1885 c = client_request_x11(ctype, rchan);
1886 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1887 c = client_request_agent(ctype, rchan);
1889 /* XXX duplicate : */
1891 debug("confirm %s", ctype);
1892 c->remote_id = rchan;
1893 c->remote_window = rwindow;
1894 c->remote_maxpacket = rmaxpack;
1895 if (c->type != SSH_CHANNEL_CONNECTING) {
1896 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1897 packet_put_int(c->remote_id);
1898 packet_put_int(c->self);
1899 packet_put_int(c->local_window);
1900 packet_put_int(c->local_maxpacket);
1904 debug("failure %s", ctype);
1905 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1906 packet_put_int(rchan);
1907 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1908 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1909 packet_put_cstring("open failed");
1910 packet_put_cstring("");
1917 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1920 int exitval, id, reply, success = 0;
1923 id = packet_get_int();
1924 rtype = packet_get_string(NULL);
1925 reply = packet_get_char();
1927 debug("client_input_channel_req: channel %d rtype %s reply %d",
1931 error("client_input_channel_req: request for channel -1");
1932 } else if ((c = channel_lookup(id)) == NULL) {
1933 error("client_input_channel_req: channel %d: "
1934 "unknown channel", id);
1935 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1938 } else if (strcmp(rtype, "exit-status") == 0) {
1939 exitval = packet_get_int();
1940 if (c->ctl_chan != -1) {
1941 mux_exit_message(c, exitval);
1943 } else if (id == session_ident) {
1944 /* Record exit value of local session */
1946 exit_status = exitval;
1948 /* Probably for a mux channel that has already closed */
1949 debug("%s: no sink for exit-status on channel %d",
1954 if (reply && c != NULL) {
1955 packet_start(success ?
1956 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1957 packet_put_int(c->remote_id);
1963 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1969 rtype = packet_get_string(NULL);
1970 want_reply = packet_get_char();
1971 debug("client_input_global_request: rtype %s want_reply %d",
1974 packet_start(success ?
1975 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1977 packet_write_wait();
1983 client_session2_setup(int id, int want_tty, int want_subsystem,
1984 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1989 debug2("%s: id %d", __func__, id);
1991 if ((c = channel_lookup(id)) == NULL)
1992 fatal("client_session2_setup: channel %d: unknown channel", id);
1994 packet_set_interactive(want_tty,
1995 options.ip_qos_interactive, options.ip_qos_bulk);
2000 /* Store window size in the packet. */
2001 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2002 memset(&ws, 0, sizeof(ws));
2004 channel_request_start(id, "pty-req", 1);
2005 client_expect_confirm(id, "PTY allocation", 1);
2006 packet_put_cstring(term != NULL ? term : "");
2007 packet_put_int((u_int)ws.ws_col);
2008 packet_put_int((u_int)ws.ws_row);
2009 packet_put_int((u_int)ws.ws_xpixel);
2010 packet_put_int((u_int)ws.ws_ypixel);
2012 tiop = get_saved_tio();
2013 tty_make_modes(-1, tiop);
2015 /* XXX wait for reply */
2019 /* Transfer any environment variables from client to server */
2020 if (options.num_send_env != 0 && env != NULL) {
2024 debug("Sending environment.");
2025 for (i = 0; env[i] != NULL; i++) {
2027 name = xstrdup(env[i]);
2028 if ((val = strchr(name, '=')) == NULL) {
2035 for (j = 0; j < options.num_send_env; j++) {
2036 if (match_pattern(name, options.send_env[j])) {
2042 debug3("Ignored env %s", name);
2047 debug("Sending env %s = %s", name, val);
2048 channel_request_start(id, "env", 0);
2049 packet_put_cstring(name);
2050 packet_put_cstring(val);
2056 len = buffer_len(cmd);
2060 if (want_subsystem) {
2061 debug("Sending subsystem: %.*s",
2062 len, (u_char*)buffer_ptr(cmd));
2063 channel_request_start(id, "subsystem", 1);
2064 client_expect_confirm(id, "subsystem", 1);
2066 debug("Sending command: %.*s",
2067 len, (u_char*)buffer_ptr(cmd));
2068 channel_request_start(id, "exec", 1);
2069 client_expect_confirm(id, "exec", 1);
2071 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2074 channel_request_start(id, "shell", 1);
2075 client_expect_confirm(id, "shell", 1);
2081 client_init_dispatch_20(void)
2083 dispatch_init(&dispatch_protocol_error);
2085 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2086 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2087 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2088 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2089 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2090 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2091 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2092 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2093 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2094 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2095 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2096 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2099 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2101 /* global request reply messages */
2102 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2103 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2107 client_init_dispatch_13(void)
2109 dispatch_init(NULL);
2110 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2111 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2112 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2113 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2114 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2115 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2116 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2117 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2118 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2120 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2121 &client_input_agent_open : &deny_input_open);
2122 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2123 &x11_input_open : &deny_input_open);
2127 client_init_dispatch_15(void)
2129 client_init_dispatch_13();
2130 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2131 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2135 client_init_dispatch(void)
2138 client_init_dispatch_20();
2140 client_init_dispatch_13();
2142 client_init_dispatch_15();
2145 /* client specific fatal cleanup */
2149 leave_raw_mode(force_tty_flag);
2150 leave_non_blocking();
2151 if (options.control_path != NULL && muxserver_sock != -1)
2152 unlink(options.control_path);
2153 ssh_kill_proxy_command();