1 /* $OpenBSD: clientloop.c,v 1.215 2009/11/17 05:31:44 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"
115 extern Options options;
117 /* Flag indicating that stdin should be redirected from /dev/null. */
118 extern int stdin_null_flag;
120 /* Flag indicating that no shell has been requested */
121 extern int no_shell_flag;
124 extern int muxserver_sock;
127 * Name of the host we are connecting to. This is the name given on the
128 * command line, or the HostName specified for the user-supplied name in a
129 * configuration file.
134 * Flag to indicate that we have received a window change signal which has
135 * not yet been processed. This will cause a message indicating the new
136 * window size to be sent to the server a little later. This is volatile
137 * because this is updated in a signal handler.
139 static volatile sig_atomic_t received_window_change_signal = 0;
140 static volatile sig_atomic_t received_signal = 0;
142 /* Flag indicating whether the user's terminal is in non-blocking mode. */
143 static int in_non_blocking_mode = 0;
145 /* Common data for the client loop code. */
146 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
147 static int escape_char1; /* Escape character. (proto1 only) */
148 static int escape_pending1; /* Last character was an escape (proto1 only) */
149 static int last_was_cr; /* Last character was a newline. */
150 static int exit_status; /* Used to store the command exit status. */
151 static int stdin_eof; /* EOF has been encountered on stderr. */
152 static Buffer stdin_buffer; /* Buffer for stdin data. */
153 static Buffer stdout_buffer; /* Buffer for stdout data. */
154 static Buffer stderr_buffer; /* Buffer for stderr data. */
155 static u_int buffer_high;/* Soft max buffer size. */
156 static int connection_in; /* Connection to server (input). */
157 static int connection_out; /* Connection to server (output). */
158 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
159 static int session_closed = 0; /* In SSH2: login session closed. */
161 static void client_init_dispatch(void);
162 int session_ident = -1;
164 int session_resumed = 0;
166 /* Track escape per proto2 channel */
167 struct escape_filter_ctx {
172 /* Context for channel confirmation replies */
173 struct channel_reply_ctx {
174 const char *request_type;
178 /* Global request success/failure callbacks */
179 struct global_confirm {
180 TAILQ_ENTRY(global_confirm) entry;
181 global_confirm_cb *cb;
185 TAILQ_HEAD(global_confirms, global_confirm);
186 static struct global_confirms global_confirms =
187 TAILQ_HEAD_INITIALIZER(global_confirms);
192 void ssh_process_session2_setup(int, int, int, Buffer *);
194 /* Restores stdin to blocking mode. */
197 leave_non_blocking(void)
199 if (in_non_blocking_mode) {
200 unset_nonblock(fileno(stdin));
201 in_non_blocking_mode = 0;
205 /* Puts stdin terminal in non-blocking mode. */
208 enter_non_blocking(void)
210 in_non_blocking_mode = 1;
211 set_nonblock(fileno(stdin));
215 * Signal handler for the window change signal (SIGWINCH). This just sets a
216 * flag indicating that the window has changed.
220 window_change_handler(int sig)
222 received_window_change_signal = 1;
223 signal(SIGWINCH, window_change_handler);
227 * Signal handler for signals that cause the program to terminate. These
228 * signals must be trapped to restore terminal modes.
232 signal_handler(int sig)
234 received_signal = sig;
239 * Returns current time in seconds from Jan 1, 1970 with the maximum
240 * available resolution.
244 get_current_time(void)
247 gettimeofday(&tv, NULL);
248 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
251 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
253 client_x11_get_proto(const char *display, const char *xauth_path,
254 u_int trusted, char **_proto, char **_data)
259 static char proto[512], data[512];
261 int got_data = 0, generated = 0, do_unlink = 0, i;
262 char *xauthdir, *xauthfile;
265 xauthdir = xauthfile = NULL;
268 proto[0] = data[0] = '\0';
270 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
271 debug("No xauth program.");
273 if (display == NULL) {
274 debug("x11_get_proto: DISPLAY not set");
278 * Handle FamilyLocal case where $DISPLAY does
279 * not match an authorization entry. For this we
280 * just try "xauth list unix:displaynum.screennum".
281 * XXX: "localhost" match to determine FamilyLocal
284 if (strncmp(display, "localhost:", 10) == 0) {
285 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
290 xauthdir = xmalloc(MAXPATHLEN);
291 xauthfile = xmalloc(MAXPATHLEN);
292 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
293 if (mkdtemp(xauthdir) != NULL) {
295 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
297 snprintf(cmd, sizeof(cmd),
298 "%s -f %s generate %s " SSH_X11_PROTO
299 " untrusted timeout 1200 2>" _PATH_DEVNULL,
300 xauth_path, xauthfile, display);
301 debug2("x11_get_proto: %s", cmd);
302 if (system(cmd) == 0)
308 * When in untrusted mode, we read the cookie only if it was
309 * successfully generated as an untrusted one in the step
312 if (trusted || generated) {
313 snprintf(cmd, sizeof(cmd),
314 "%s %s%s list %s 2>" _PATH_DEVNULL,
316 generated ? "-f " : "" ,
317 generated ? xauthfile : "",
319 debug2("x11_get_proto: %s", cmd);
321 if (f && fgets(line, sizeof(line), f) &&
322 sscanf(line, "%*s %511s %511s", proto, data) == 2)
327 error("Warning: untrusted X11 forwarding setup failed: "
328 "xauth key data not generated");
341 * If we didn't get authentication data, just make up some
342 * data. The forwarding code will check the validity of the
343 * response anyway, and substitute this data. The X11
344 * server, however, will ignore this fake data and use
345 * whatever authentication mechanisms it was using otherwise
346 * for the local connection.
351 logit("Warning: No xauth data; "
352 "using fake authentication data for X11 forwarding.");
353 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
354 for (i = 0; i < 16; i++) {
357 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
365 * This is called when the interactive is entered. This checks if there is
366 * an EOF coming on stdin. We must check this explicitly, as select() does
367 * not appear to wake up when redirecting from /dev/null.
371 client_check_initial_eof_on_stdin(void)
377 * If standard input is to be "redirected from /dev/null", we simply
378 * mark that we have seen an EOF and send an EOF message to the
379 * server. Otherwise, we try to read a single character; it appears
380 * that for some files, such /dev/null, select() never wakes up for
381 * read for this descriptor, which means that we never get EOF. This
382 * way we will get the EOF if stdin comes from /dev/null or similar.
384 if (stdin_null_flag) {
385 /* Fake EOF on stdin. */
386 debug("Sending eof.");
388 packet_start(SSH_CMSG_EOF);
391 enter_non_blocking();
393 /* Check for immediate EOF on stdin. */
394 len = read(fileno(stdin), buf, 1);
397 * EOF. Record that we have seen it and send
400 debug("Sending eof.");
402 packet_start(SSH_CMSG_EOF);
404 } else if (len > 0) {
406 * Got data. We must store the data in the buffer,
407 * and also process it as an escape character if
410 if ((u_char) buf[0] == escape_char1)
413 buffer_append(&stdin_buffer, buf, 1);
415 leave_non_blocking();
421 * Make packets from buffered stdin data, and buffer them for sending to the
426 client_make_packets_from_stdin_data(void)
430 /* Send buffered stdin data to the server. */
431 while (buffer_len(&stdin_buffer) > 0 &&
432 packet_not_very_much_data_to_write()) {
433 len = buffer_len(&stdin_buffer);
434 /* Keep the packets at reasonable size. */
435 if (len > packet_get_maxsize())
436 len = packet_get_maxsize();
437 packet_start(SSH_CMSG_STDIN_DATA);
438 packet_put_string(buffer_ptr(&stdin_buffer), len);
440 buffer_consume(&stdin_buffer, len);
441 /* If we have a pending EOF, send it now. */
442 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
443 packet_start(SSH_CMSG_EOF);
450 * Checks if the client window has changed, and sends a packet about it to
451 * the server if so. The actual change is detected elsewhere (by a software
452 * interrupt on Unix); this just checks the flag and sends a message if
457 client_check_window_change(void)
461 if (! received_window_change_signal)
464 received_window_change_signal = 0;
466 debug2("client_check_window_change: changed");
469 channel_send_window_changes();
471 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
473 packet_start(SSH_CMSG_WINDOW_SIZE);
474 packet_put_int((u_int)ws.ws_row);
475 packet_put_int((u_int)ws.ws_col);
476 packet_put_int((u_int)ws.ws_xpixel);
477 packet_put_int((u_int)ws.ws_ypixel);
483 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
485 struct global_confirm *gc;
487 if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
490 gc->cb(type, seq, gc->ctx);
491 if (--gc->ref_count <= 0) {
492 TAILQ_REMOVE(&global_confirms, gc, entry);
493 bzero(gc, sizeof(*gc));
497 packet_set_alive_timeouts(0);
501 server_alive_check(void)
503 if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
504 logit("Timeout, server not responding.");
507 packet_start(SSH2_MSG_GLOBAL_REQUEST);
508 packet_put_cstring("keepalive@openssh.com");
509 packet_put_char(1); /* boolean: want reply */
511 /* Insert an empty placeholder to maintain ordering */
512 client_register_global_confirm(NULL, NULL);
516 * Waits until the client can do something (some data becomes available on
517 * one of the file descriptors).
520 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
521 int *maxfdp, u_int *nallocp, int rekeying)
523 struct timeval tv, *tvp;
526 /* Add any selections by the channel mechanism. */
527 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
530 /* Read from the connection, unless our buffers are full. */
531 if (buffer_len(&stdout_buffer) < buffer_high &&
532 buffer_len(&stderr_buffer) < buffer_high &&
533 channel_not_very_much_buffered_data())
534 FD_SET(connection_in, *readsetp);
536 * Read from stdin, unless we have seen EOF or have very much
537 * buffered data to send to the server.
539 if (!stdin_eof && packet_not_very_much_data_to_write())
540 FD_SET(fileno(stdin), *readsetp);
542 /* Select stdout/stderr if have data in buffer. */
543 if (buffer_len(&stdout_buffer) > 0)
544 FD_SET(fileno(stdout), *writesetp);
545 if (buffer_len(&stderr_buffer) > 0)
546 FD_SET(fileno(stderr), *writesetp);
548 /* channel_prepare_select could have closed the last channel */
549 if (session_closed && !channel_still_open() &&
550 !packet_have_data_to_write()) {
551 /* clear mask since we did not call select() */
552 memset(*readsetp, 0, *nallocp);
553 memset(*writesetp, 0, *nallocp);
556 FD_SET(connection_in, *readsetp);
560 /* Select server connection if have data to write to the server. */
561 if (packet_have_data_to_write())
562 FD_SET(connection_out, *writesetp);
564 if (muxserver_sock != -1)
565 FD_SET(muxserver_sock, *readsetp);
568 * Wait for something to happen. This will suspend the process until
569 * some selected descriptor can be read, written, or has some other
573 if (options.server_alive_interval == 0 || !compat20)
576 tv.tv_sec = options.server_alive_interval;
580 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
585 * We have to clear the select masks, because we return.
586 * We have to return, because the mainloop checks for the flags
587 * set by the signal handlers.
589 memset(*readsetp, 0, *nallocp);
590 memset(*writesetp, 0, *nallocp);
594 /* Note: we might still have data in the buffers. */
595 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
596 buffer_append(&stderr_buffer, buf, strlen(buf));
599 server_alive_check();
603 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
605 /* Flush stdout and stderr buffers. */
606 if (buffer_len(bout) > 0)
607 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
609 if (buffer_len(berr) > 0)
610 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
616 * Free (and clear) the buffer to reduce the amount of data that gets
623 /* Send the suspend signal to the program itself. */
624 kill(getpid(), SIGTSTP);
626 /* Reset window sizes in case they have changed */
627 received_window_change_signal = 1;
629 /* OK, we have been continued by the user. Reinitialize buffers. */
638 client_process_net_input(fd_set *readset)
641 char buf[SSH_IOBUFSZ];
644 * Read input from the server, and add any such data to the buffer of
645 * the packet subsystem.
647 if (FD_ISSET(connection_in, readset)) {
648 /* Read as much as possible. */
649 len = roaming_read(connection_in, buf, sizeof(buf), &cont);
650 if (len == 0 && cont == 0) {
652 * Received EOF. The remote host has closed the
655 snprintf(buf, sizeof buf,
656 "Connection to %.300s closed by remote host.\r\n",
658 buffer_append(&stderr_buffer, buf, strlen(buf));
663 * There is a kernel bug on Solaris that causes select to
664 * sometimes wake up even though there is no data available.
667 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
672 * An error has encountered. Perhaps there is a
675 snprintf(buf, sizeof buf,
676 "Read from remote host %.300s: %.100s\r\n",
677 host, strerror(errno));
678 buffer_append(&stderr_buffer, buf, strlen(buf));
682 packet_process_incoming(buf, len);
687 client_status_confirm(int type, Channel *c, void *ctx)
689 struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
693 /* XXX supress on mux _client_ quietmode */
694 tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
695 c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
697 if (type == SSH2_MSG_CHANNEL_SUCCESS) {
698 debug2("%s request accepted on channel %d",
699 cr->request_type, c->self);
700 } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
702 snprintf(errmsg, sizeof(errmsg),
703 "%s request failed\r\n", cr->request_type);
705 snprintf(errmsg, sizeof(errmsg),
706 "%s request failed on channel %d",
707 cr->request_type, c->self);
709 /* If error occurred on primary session channel, then exit */
710 if (cr->do_close && c->self == session_ident)
712 /* If error occurred on mux client, append to their stderr */
714 buffer_append(&c->extended, errmsg, strlen(errmsg));
719 chan_write_failed(c);
726 client_abandon_status_confirm(Channel *c, void *ctx)
732 client_expect_confirm(int id, const char *request, int do_close)
734 struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
736 cr->request_type = request;
737 cr->do_close = do_close;
739 channel_register_status_confirm(id, client_status_confirm,
740 client_abandon_status_confirm, cr);
744 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
746 struct global_confirm *gc, *last_gc;
748 /* Coalesce identical callbacks */
749 last_gc = TAILQ_LAST(&global_confirms, global_confirms);
750 if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
751 if (++last_gc->ref_count >= INT_MAX)
752 fatal("%s: last_gc->ref_count = %d",
753 __func__, last_gc->ref_count);
757 gc = xmalloc(sizeof(*gc));
761 TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
765 process_cmdline(void)
767 void (*handler)(int);
768 char *s, *cmd, *cancel_host;
770 int local = 0, remote = 0, dynamic = 0;
774 bzero(&fwd, sizeof(fwd));
775 fwd.listen_host = fwd.connect_host = NULL;
778 handler = signal(SIGINT, SIG_IGN);
779 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
785 s++; /* Skip cmdline '-', if any */
789 if (*s == 'h' || *s == 'H' || *s == '?') {
791 logit(" -L[bind_address:]port:host:hostport "
792 "Request local forward");
793 logit(" -R[bind_address:]port:host:hostport "
794 "Request remote forward");
795 logit(" -D[bind_address:]port "
796 "Request dynamic forward");
797 logit(" -KR[bind_address:]port "
798 "Cancel remote forward");
799 if (!options.permit_local_command)
802 "Execute local command");
806 if (*s == '!' && options.permit_local_command) {
823 logit("Invalid command.");
827 if ((local || dynamic) && delete) {
828 logit("Not supported.");
831 if (remote && delete && !compat20) {
832 logit("Not supported for SSH protocol version 1.");
836 while (isspace(*++s))
841 cancel_host = hpdelim(&s); /* may be NULL */
843 cancel_port = a2port(s);
844 cancel_host = cleanhostname(cancel_host);
846 cancel_port = a2port(cancel_host);
849 if (cancel_port <= 0) {
850 logit("Bad forwarding close port");
853 channel_request_rforward_cancel(cancel_host, cancel_port);
855 if (!parse_forward(&fwd, s, dynamic, remote)) {
856 logit("Bad forwarding specification.");
859 if (local || dynamic) {
860 if (channel_setup_local_fwd_listener(fwd.listen_host,
861 fwd.listen_port, fwd.connect_host,
862 fwd.connect_port, options.gateway_ports) < 0) {
863 logit("Port forwarding failed.");
867 if (channel_request_remote_forwarding(fwd.listen_host,
868 fwd.listen_port, fwd.connect_host,
869 fwd.connect_port) < 0) {
870 logit("Port forwarding failed.");
875 logit("Forwarding port.");
879 signal(SIGINT, handler);
883 if (fwd.listen_host != NULL)
884 xfree(fwd.listen_host);
885 if (fwd.connect_host != NULL)
886 xfree(fwd.connect_host);
890 * Process the characters one by one, call with c==NULL for proto1 case.
893 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
902 int *escape_pendingp, escape_char;
903 struct escape_filter_ctx *efc;
906 escape_pendingp = &escape_pending1;
907 escape_char = escape_char1;
909 if (c->filter_ctx == NULL)
911 efc = (struct escape_filter_ctx *)c->filter_ctx;
912 escape_pendingp = &efc->escape_pending;
913 escape_char = efc->escape_char;
919 for (i = 0; i < (u_int)len; i++) {
920 /* Get one character at a time. */
923 if (*escape_pendingp) {
924 /* We have previously seen an escape character. */
925 /* Clear the flag now. */
926 *escape_pendingp = 0;
928 /* Process the escaped character. */
931 /* Terminate the connection. */
932 snprintf(string, sizeof string, "%c.\r\n",
934 buffer_append(berr, string, strlen(string));
936 if (c && c->ctl_fd != -1) {
938 chan_write_failed(c);
945 /* XXX support this for mux clients */
946 if (c && c->ctl_fd != -1) {
948 snprintf(string, sizeof string,
949 "%c%c escape not available to "
950 "multiplexed sessions\r\n",
952 buffer_append(berr, string,
956 /* Suspend the program. Inform the user */
957 snprintf(string, sizeof string,
958 "%c^Z [suspend ssh]\r\n", escape_char);
959 buffer_append(berr, string, strlen(string));
961 /* Restore terminal modes and suspend. */
962 client_suspend_self(bin, bout, berr);
964 /* We have been continued. */
969 snprintf(string, sizeof string,
970 "%cB\r\n", escape_char);
971 buffer_append(berr, string,
973 channel_request_start(session_ident,
975 packet_put_int(1000);
982 if (datafellows & SSH_BUG_NOREKEY)
983 logit("Server does not "
984 "support re-keying");
991 if (c && c->ctl_fd != -1)
994 * Detach the program (continue to serve
995 * connections, but put in background and no
996 * more new connections).
998 /* Restore tty modes. */
1001 /* Stop listening for new connections. */
1002 channel_stop_listening();
1004 snprintf(string, sizeof string,
1005 "%c& [backgrounded]\n", escape_char);
1006 buffer_append(berr, string, strlen(string));
1008 /* Fork into background. */
1011 error("fork: %.100s", strerror(errno));
1014 if (pid != 0) { /* This is the parent. */
1015 /* The parent just exits. */
1018 /* The child continues serving connections. */
1020 buffer_append(bin, "\004", 1);
1021 /* fake EOF on stdin */
1023 } else if (!stdin_eof) {
1025 * Sending SSH_CMSG_EOF alone does not
1026 * always appear to be enough. So we
1027 * try to send an EOF character first.
1029 packet_start(SSH_CMSG_STDIN_DATA);
1030 packet_put_string("\004", 1);
1034 if (buffer_len(bin) == 0) {
1035 packet_start(SSH_CMSG_EOF);
1042 if (c && c->ctl_fd != -1) {
1043 snprintf(string, sizeof string,
1045 Supported escape sequences:\r\n\
1046 %c. - terminate session\r\n\
1047 %cB - send a BREAK to the remote system\r\n\
1048 %cR - Request rekey (SSH protocol 2 only)\r\n\
1049 %c# - list forwarded connections\r\n\
1050 %c? - this message\r\n\
1051 %c%c - send the escape character by typing it twice\r\n\
1052 (Note that escapes are only recognized immediately after newline.)\r\n",
1053 escape_char, escape_char,
1054 escape_char, escape_char,
1055 escape_char, escape_char,
1056 escape_char, escape_char);
1058 snprintf(string, sizeof string,
1060 Supported escape sequences:\r\n\
1061 %c. - terminate connection (and any multiplexed sessions)\r\n\
1062 %cB - send a BREAK to the remote system\r\n\
1063 %cC - open a command line\r\n\
1064 %cR - Request rekey (SSH protocol 2 only)\r\n\
1065 %c^Z - suspend ssh\r\n\
1066 %c# - list forwarded connections\r\n\
1067 %c& - background ssh (when waiting for connections to terminate)\r\n\
1068 %c? - this message\r\n\
1069 %c%c - send the escape character by typing it twice\r\n\
1070 (Note that escapes are only recognized immediately after newline.)\r\n",
1071 escape_char, escape_char,
1072 escape_char, escape_char,
1073 escape_char, escape_char,
1074 escape_char, escape_char,
1075 escape_char, escape_char,
1078 buffer_append(berr, string, strlen(string));
1082 snprintf(string, sizeof string, "%c#\r\n",
1084 buffer_append(berr, string, strlen(string));
1085 s = channel_open_message();
1086 buffer_append(berr, s, strlen(s));
1091 if (c && c->ctl_fd != -1)
1097 if (ch != escape_char) {
1098 buffer_put_char(bin, escape_char);
1101 /* Escaped characters fall through here */
1106 * The previous character was not an escape char.
1107 * Check if this is an escape.
1109 if (last_was_cr && ch == escape_char) {
1111 * It is. Set the flag and continue to
1114 *escape_pendingp = 1;
1120 * Normal character. Record whether it was a newline,
1121 * and append it to the buffer.
1123 last_was_cr = (ch == '\r' || ch == '\n');
1124 buffer_put_char(bin, ch);
1131 client_process_input(fd_set *readset)
1134 char buf[SSH_IOBUFSZ];
1136 /* Read input from stdin. */
1137 if (FD_ISSET(fileno(stdin), readset)) {
1138 /* Read as much as possible. */
1139 len = read(fileno(stdin), buf, sizeof(buf));
1141 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1142 return; /* we'll try again later */
1145 * Received EOF or error. They are treated
1146 * similarly, except that an error message is printed
1147 * if it was an error condition.
1150 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1152 buffer_append(&stderr_buffer, buf, strlen(buf));
1154 /* Mark that we have seen EOF. */
1157 * Send an EOF message to the server unless there is
1158 * data in the buffer. If there is data in the
1159 * buffer, no message will be sent now. Code
1160 * elsewhere will send the EOF when the buffer
1161 * becomes empty if stdin_eof is set.
1163 if (buffer_len(&stdin_buffer) == 0) {
1164 packet_start(SSH_CMSG_EOF);
1167 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1169 * Normal successful read, and no escape character.
1170 * Just append the data to buffer.
1172 buffer_append(&stdin_buffer, buf, len);
1175 * Normal, successful read. But we have an escape
1176 * character and have to process the characters one
1179 if (process_escapes(NULL, &stdin_buffer,
1180 &stdout_buffer, &stderr_buffer, buf, len) == -1)
1187 client_process_output(fd_set *writeset)
1192 /* Write buffered output to stdout. */
1193 if (FD_ISSET(fileno(stdout), writeset)) {
1194 /* Write as much data as possible. */
1195 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1196 buffer_len(&stdout_buffer));
1198 if (errno == EINTR || errno == EAGAIN ||
1199 errno == EWOULDBLOCK)
1203 * An error or EOF was encountered. Put an
1204 * error message to stderr buffer.
1206 snprintf(buf, sizeof buf,
1207 "write stdout: %.50s\r\n", strerror(errno));
1208 buffer_append(&stderr_buffer, buf, strlen(buf));
1213 /* Consume printed data from the buffer. */
1214 buffer_consume(&stdout_buffer, len);
1216 /* Write buffered output to stderr. */
1217 if (FD_ISSET(fileno(stderr), writeset)) {
1218 /* Write as much data as possible. */
1219 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1220 buffer_len(&stderr_buffer));
1222 if (errno == EINTR || errno == EAGAIN ||
1223 errno == EWOULDBLOCK)
1227 * EOF or error, but can't even print
1234 /* Consume printed characters from the buffer. */
1235 buffer_consume(&stderr_buffer, len);
1240 * Get packets from the connection input buffer, and process them as long as
1241 * there are packets available.
1243 * Any unknown packets received during the actual
1244 * session cause the session to terminate. This is
1245 * intended to make debugging easier since no
1246 * confirmations are sent. Any compatible protocol
1247 * extensions must be negotiated during the
1248 * preparatory phase.
1252 client_process_buffered_input_packets(void)
1254 dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1255 compat20 ? xxx_kex : NULL);
1258 /* scan buf[] for '~' before sending data to the peer */
1260 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1262 client_new_escape_filter_ctx(int escape_char)
1264 struct escape_filter_ctx *ret;
1266 ret = xmalloc(sizeof(*ret));
1267 ret->escape_pending = 0;
1268 ret->escape_char = escape_char;
1272 /* Free the escape filter context on channel free */
1274 client_filter_cleanup(int cid, void *ctx)
1280 client_simple_escape_filter(Channel *c, char *buf, int len)
1282 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1285 return process_escapes(c, &c->input, &c->output, &c->extended,
1290 client_channel_closed(int id, void *arg)
1292 channel_cancel_cleanup(id);
1298 * Implements the interactive session with the server. This is called after
1299 * the user has been authenticated, and a command has been started on the
1300 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1301 * used as an escape character for terminating or suspending the session.
1305 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1307 fd_set *readset = NULL, *writeset = NULL;
1308 double start_time, total_time;
1309 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1310 u_int64_t ibytes, obytes;
1314 debug("Entering interactive session.");
1316 start_time = get_current_time();
1318 /* Initialize variables. */
1319 escape_pending1 = 0;
1323 buffer_high = 64 * 1024;
1324 connection_in = packet_get_connection_in();
1325 connection_out = packet_get_connection_out();
1326 max_fd = MAX(connection_in, connection_out);
1327 if (muxserver_sock != -1)
1328 max_fd = MAX(max_fd, muxserver_sock);
1331 /* enable nonblocking unless tty */
1332 if (!isatty(fileno(stdin)))
1333 set_nonblock(fileno(stdin));
1334 if (!isatty(fileno(stdout)))
1335 set_nonblock(fileno(stdout));
1336 if (!isatty(fileno(stderr)))
1337 set_nonblock(fileno(stderr));
1338 max_fd = MAX(max_fd, fileno(stdin));
1339 max_fd = MAX(max_fd, fileno(stdout));
1340 max_fd = MAX(max_fd, fileno(stderr));
1343 escape_char1 = escape_char_arg;
1345 /* Initialize buffers. */
1346 buffer_init(&stdin_buffer);
1347 buffer_init(&stdout_buffer);
1348 buffer_init(&stderr_buffer);
1350 client_init_dispatch();
1353 * Set signal handlers, (e.g. to restore non-blocking mode)
1354 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1356 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1357 signal(SIGHUP, signal_handler);
1358 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1359 signal(SIGINT, signal_handler);
1360 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1361 signal(SIGQUIT, signal_handler);
1362 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1363 signal(SIGTERM, signal_handler);
1364 signal(SIGWINCH, window_change_handler);
1370 session_ident = ssh2_chan_id;
1371 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1372 channel_register_filter(session_ident,
1373 client_simple_escape_filter, NULL,
1374 client_filter_cleanup,
1375 client_new_escape_filter_ctx(escape_char_arg));
1376 if (session_ident != -1)
1377 channel_register_cleanup(session_ident,
1378 client_channel_closed, 0);
1380 /* Check if we should immediately send eof on stdin. */
1381 client_check_initial_eof_on_stdin();
1384 /* Main loop of the client for the interactive session mode. */
1385 while (!quit_pending) {
1387 /* Process buffered packets sent by the server. */
1388 client_process_buffered_input_packets();
1390 if (compat20 && session_closed && !channel_still_open())
1393 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1396 debug("rekeying in progress");
1399 * Make packets of buffered stdin data, and buffer
1400 * them for sending to the server.
1403 client_make_packets_from_stdin_data();
1406 * Make packets from buffered channel data, and
1407 * enqueue them for sending to the server.
1409 if (packet_not_very_much_data_to_write())
1410 channel_output_poll();
1413 * Check if the window size has changed, and buffer a
1414 * message about it to the server if so.
1416 client_check_window_change();
1422 * Wait until we have something to do (something becomes
1423 * available on one of the descriptors).
1426 client_wait_until_can_do_something(&readset, &writeset,
1427 &max_fd2, &nalloc, rekeying);
1432 /* Do channel operations unless rekeying in progress. */
1434 channel_after_select(readset, writeset);
1435 if (need_rekeying || packet_need_rekeying()) {
1436 debug("need rekeying");
1438 kex_send_kexinit(xxx_kex);
1443 /* Buffer input from the connection. */
1444 client_process_net_input(readset);
1446 /* Accept control connections. */
1447 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1448 if (muxserver_accept_control())
1456 /* Buffer data from stdin */
1457 client_process_input(readset);
1459 * Process output to stdout and stderr. Output to
1460 * the connection is processed elsewhere (above).
1462 client_process_output(writeset);
1465 if (session_resumed) {
1466 connection_in = packet_get_connection_in();
1467 connection_out = packet_get_connection_out();
1468 max_fd = MAX(max_fd, connection_out);
1469 max_fd = MAX(max_fd, connection_in);
1470 session_resumed = 0;
1474 * Send as much buffered packet data as possible to the
1477 if (FD_ISSET(connection_out, writeset))
1478 packet_write_poll();
1485 /* Terminate the session. */
1487 /* Stop watching for window change. */
1488 signal(SIGWINCH, SIG_DFL);
1491 packet_start(SSH2_MSG_DISCONNECT);
1492 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1493 packet_put_cstring("disconnected by user");
1495 packet_write_wait();
1503 /* restore blocking io */
1504 if (!isatty(fileno(stdin)))
1505 unset_nonblock(fileno(stdin));
1506 if (!isatty(fileno(stdout)))
1507 unset_nonblock(fileno(stdout));
1508 if (!isatty(fileno(stderr)))
1509 unset_nonblock(fileno(stderr));
1512 * If there was no shell or command requested, there will be no remote
1513 * exit status to be returned. In that case, clear error code if the
1514 * connection was deliberately terminated at this end.
1516 if (no_shell_flag && received_signal == SIGTERM) {
1517 received_signal = 0;
1521 if (received_signal)
1522 fatal("Killed by signal %d.", (int) received_signal);
1525 * In interactive mode (with pseudo tty) display a message indicating
1526 * that the connection has been closed.
1528 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1529 snprintf(buf, sizeof buf,
1530 "Connection to %.64s closed.\r\n", host);
1531 buffer_append(&stderr_buffer, buf, strlen(buf));
1534 /* Output any buffered data for stdout. */
1535 while (buffer_len(&stdout_buffer) > 0) {
1536 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1537 buffer_len(&stdout_buffer));
1539 error("Write failed flushing stdout buffer.");
1542 buffer_consume(&stdout_buffer, len);
1545 /* Output any buffered data for stderr. */
1546 while (buffer_len(&stderr_buffer) > 0) {
1547 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1548 buffer_len(&stderr_buffer));
1550 error("Write failed flushing stderr buffer.");
1553 buffer_consume(&stderr_buffer, len);
1556 /* Clear and free any buffers. */
1557 memset(buf, 0, sizeof(buf));
1558 buffer_free(&stdin_buffer);
1559 buffer_free(&stdout_buffer);
1560 buffer_free(&stderr_buffer);
1562 /* Report bytes transferred, and transfer rates. */
1563 total_time = get_current_time() - start_time;
1564 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1565 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1566 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1567 obytes, ibytes, total_time);
1569 verbose("Bytes per second: sent %.1f, received %.1f",
1570 obytes / total_time, ibytes / total_time);
1571 /* Return the exit status of the program. */
1572 debug("Exit status %d", exit_status);
1579 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1582 char *data = packet_get_string(&data_len);
1584 buffer_append(&stdout_buffer, data, data_len);
1585 memset(data, 0, data_len);
1589 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1592 char *data = packet_get_string(&data_len);
1594 buffer_append(&stderr_buffer, data, data_len);
1595 memset(data, 0, data_len);
1599 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1601 exit_status = packet_get_int();
1603 /* Acknowledge the exit. */
1604 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1607 * Must wait for packet to be sent since we are
1610 packet_write_wait();
1611 /* Flag that we want to exit. */
1615 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1618 int remote_id, sock;
1620 /* Read the remote channel number from the message. */
1621 remote_id = packet_get_int();
1625 * Get a connection to the local authentication agent (this may again
1628 sock = ssh_get_authentication_socket();
1631 * If we could not connect the agent, send an error message back to
1632 * the server. This should never happen unless the agent dies,
1633 * because authentication forwarding is only enabled if we have an
1637 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1638 -1, 0, 0, 0, "authentication agent connection", 1);
1639 c->remote_id = remote_id;
1643 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1644 packet_put_int(remote_id);
1646 /* Send a confirmation to the remote host. */
1647 debug("Forwarding authentication connection.");
1648 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1649 packet_put_int(remote_id);
1650 packet_put_int(c->self);
1656 client_request_forwarded_tcpip(const char *request_type, int rchan)
1659 char *listen_address, *originator_address;
1660 u_short listen_port, originator_port;
1662 /* Get rest of the packet */
1663 listen_address = packet_get_string(NULL);
1664 listen_port = packet_get_int();
1665 originator_address = packet_get_string(NULL);
1666 originator_port = packet_get_int();
1669 debug("client_request_forwarded_tcpip: listen %s port %d, "
1670 "originator %s port %d", listen_address, listen_port,
1671 originator_address, originator_port);
1673 c = channel_connect_by_listen_address(listen_port,
1674 "forwarded-tcpip", originator_address);
1676 xfree(originator_address);
1677 xfree(listen_address);
1682 client_request_x11(const char *request_type, int rchan)
1686 u_short originator_port;
1689 if (!options.forward_x11) {
1690 error("Warning: ssh server tried X11 forwarding.");
1691 error("Warning: this is probably a break-in attempt by a "
1692 "malicious server.");
1695 originator = packet_get_string(NULL);
1696 if (datafellows & SSH_BUG_X11FWD) {
1697 debug2("buggy server: x11 request w/o originator_port");
1698 originator_port = 0;
1700 originator_port = packet_get_int();
1703 /* XXX check permission */
1704 debug("client_request_x11: request from %s %d", originator,
1707 sock = x11_connect_display();
1710 c = channel_new("x11",
1711 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1712 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1718 client_request_agent(const char *request_type, int rchan)
1723 if (!options.forward_agent) {
1724 error("Warning: ssh server tried agent forwarding.");
1725 error("Warning: this is probably a break-in attempt by a "
1726 "malicious server.");
1729 sock = ssh_get_authentication_socket();
1732 c = channel_new("authentication agent connection",
1733 SSH_CHANNEL_OPEN, sock, sock, -1,
1734 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1735 "authentication agent connection", 1);
1741 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1746 if (tun_mode == SSH_TUNMODE_NO)
1750 error("Tunnel forwarding is not supported for protocol 1");
1754 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1756 /* Open local tunnel device */
1757 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1758 error("Tunnel device open failed.");
1762 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1763 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1766 #if defined(SSH_TUN_FILTER)
1767 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1768 channel_register_filter(c->self, sys_tun_infilter,
1769 sys_tun_outfilter, NULL, NULL);
1772 packet_start(SSH2_MSG_CHANNEL_OPEN);
1773 packet_put_cstring("tun@openssh.com");
1774 packet_put_int(c->self);
1775 packet_put_int(c->local_window_max);
1776 packet_put_int(c->local_maxpacket);
1777 packet_put_int(tun_mode);
1778 packet_put_int(remote_tun);
1784 /* XXXX move to generic input handler */
1786 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1791 u_int rmaxpack, rwindow, len;
1793 ctype = packet_get_string(&len);
1794 rchan = packet_get_int();
1795 rwindow = packet_get_int();
1796 rmaxpack = packet_get_int();
1798 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1799 ctype, rchan, rwindow, rmaxpack);
1801 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1802 c = client_request_forwarded_tcpip(ctype, rchan);
1803 } else if (strcmp(ctype, "x11") == 0) {
1804 c = client_request_x11(ctype, rchan);
1805 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1806 c = client_request_agent(ctype, rchan);
1808 /* XXX duplicate : */
1810 debug("confirm %s", ctype);
1811 c->remote_id = rchan;
1812 c->remote_window = rwindow;
1813 c->remote_maxpacket = rmaxpack;
1814 if (c->type != SSH_CHANNEL_CONNECTING) {
1815 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1816 packet_put_int(c->remote_id);
1817 packet_put_int(c->self);
1818 packet_put_int(c->local_window);
1819 packet_put_int(c->local_maxpacket);
1823 debug("failure %s", ctype);
1824 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1825 packet_put_int(rchan);
1826 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1827 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1828 packet_put_cstring("open failed");
1829 packet_put_cstring("");
1836 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1839 int exitval, id, reply, success = 0;
1842 id = packet_get_int();
1843 rtype = packet_get_string(NULL);
1844 reply = packet_get_char();
1846 debug("client_input_channel_req: channel %d rtype %s reply %d",
1850 error("client_input_channel_req: request for channel -1");
1851 } else if ((c = channel_lookup(id)) == NULL) {
1852 error("client_input_channel_req: channel %d: "
1853 "unknown channel", id);
1854 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1857 } else if (strcmp(rtype, "exit-status") == 0) {
1858 exitval = packet_get_int();
1859 if (c->ctl_fd != -1) {
1860 /* Dispatch to mux client */
1861 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1863 } else if (id == session_ident) {
1864 /* Record exit value of local session */
1866 exit_status = exitval;
1868 error("client_input_channel_req: unexpected channel %d",
1874 packet_start(success ?
1875 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1876 packet_put_int(c->remote_id);
1882 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1888 rtype = packet_get_string(NULL);
1889 want_reply = packet_get_char();
1890 debug("client_input_global_request: rtype %s want_reply %d",
1893 packet_start(success ?
1894 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1896 packet_write_wait();
1902 client_session2_setup(int id, int want_tty, int want_subsystem,
1903 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1908 debug2("%s: id %d", __func__, id);
1910 if ((c = channel_lookup(id)) == NULL)
1911 fatal("client_session2_setup: channel %d: unknown channel", id);
1916 /* Store window size in the packet. */
1917 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1918 memset(&ws, 0, sizeof(ws));
1920 channel_request_start(id, "pty-req", 1);
1921 client_expect_confirm(id, "PTY allocation", 0);
1922 packet_put_cstring(term != NULL ? term : "");
1923 packet_put_int((u_int)ws.ws_col);
1924 packet_put_int((u_int)ws.ws_row);
1925 packet_put_int((u_int)ws.ws_xpixel);
1926 packet_put_int((u_int)ws.ws_ypixel);
1928 tiop = get_saved_tio();
1929 tty_make_modes(-1, tiop);
1931 /* XXX wait for reply */
1935 /* Transfer any environment variables from client to server */
1936 if (options.num_send_env != 0 && env != NULL) {
1940 debug("Sending environment.");
1941 for (i = 0; env[i] != NULL; i++) {
1943 name = xstrdup(env[i]);
1944 if ((val = strchr(name, '=')) == NULL) {
1951 for (j = 0; j < options.num_send_env; j++) {
1952 if (match_pattern(name, options.send_env[j])) {
1958 debug3("Ignored env %s", name);
1963 debug("Sending env %s = %s", name, val);
1964 channel_request_start(id, "env", 0);
1965 packet_put_cstring(name);
1966 packet_put_cstring(val);
1972 len = buffer_len(cmd);
1976 if (want_subsystem) {
1977 debug("Sending subsystem: %.*s",
1978 len, (u_char*)buffer_ptr(cmd));
1979 channel_request_start(id, "subsystem", 1);
1980 client_expect_confirm(id, "subsystem", 1);
1982 debug("Sending command: %.*s",
1983 len, (u_char*)buffer_ptr(cmd));
1984 channel_request_start(id, "exec", 1);
1985 client_expect_confirm(id, "exec", 1);
1987 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1990 channel_request_start(id, "shell", 1);
1991 client_expect_confirm(id, "shell", 1);
1997 client_init_dispatch_20(void)
1999 dispatch_init(&dispatch_protocol_error);
2001 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2002 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2003 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2004 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2005 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2006 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2007 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2008 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2009 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2010 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2011 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2012 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2015 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2017 /* global request reply messages */
2018 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2019 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2023 client_init_dispatch_13(void)
2025 dispatch_init(NULL);
2026 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2027 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2028 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2029 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2030 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2031 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2032 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2033 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2034 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2036 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2037 &client_input_agent_open : &deny_input_open);
2038 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2039 &x11_input_open : &deny_input_open);
2043 client_init_dispatch_15(void)
2045 client_init_dispatch_13();
2046 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2047 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2051 client_init_dispatch(void)
2054 client_init_dispatch_20();
2056 client_init_dispatch_13();
2058 client_init_dispatch_15();
2061 /* client specific fatal cleanup */
2066 leave_non_blocking();
2067 if (options.control_path != NULL && muxserver_sock != -1)
2068 unlink(options.control_path);