1 /* $OpenBSD: clientloop.c,v 1.201 2008/07/16 11:51:14 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"
110 #include "monitor_fdpass.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 /* Track escape per proto2 channel */
165 struct escape_filter_ctx {
170 /* Context for channel confirmation replies */
171 struct channel_reply_ctx {
172 const char *request_type;
176 /* Global request success/failure callbacks */
177 struct global_confirm {
178 TAILQ_ENTRY(global_confirm) entry;
179 global_confirm_cb *cb;
183 TAILQ_HEAD(global_confirms, global_confirm);
184 static struct global_confirms global_confirms =
185 TAILQ_HEAD_INITIALIZER(global_confirms);
190 void ssh_process_session2_setup(int, int, int, Buffer *);
192 /* Restores stdin to blocking mode. */
195 leave_non_blocking(void)
197 if (in_non_blocking_mode) {
198 unset_nonblock(fileno(stdin));
199 in_non_blocking_mode = 0;
203 /* Puts stdin terminal in non-blocking mode. */
206 enter_non_blocking(void)
208 in_non_blocking_mode = 1;
209 set_nonblock(fileno(stdin));
213 * Signal handler for the window change signal (SIGWINCH). This just sets a
214 * flag indicating that the window has changed.
218 window_change_handler(int sig)
220 received_window_change_signal = 1;
221 signal(SIGWINCH, window_change_handler);
225 * Signal handler for signals that cause the program to terminate. These
226 * signals must be trapped to restore terminal modes.
230 signal_handler(int sig)
232 received_signal = sig;
237 * Returns current time in seconds from Jan 1, 1970 with the maximum
238 * available resolution.
242 get_current_time(void)
245 gettimeofday(&tv, NULL);
246 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
249 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
251 client_x11_get_proto(const char *display, const char *xauth_path,
252 u_int trusted, char **_proto, char **_data)
257 static char proto[512], data[512];
259 int got_data = 0, generated = 0, do_unlink = 0, i;
260 char *xauthdir, *xauthfile;
263 xauthdir = xauthfile = NULL;
266 proto[0] = data[0] = '\0';
268 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
269 debug("No xauth program.");
271 if (display == NULL) {
272 debug("x11_get_proto: DISPLAY not set");
276 * Handle FamilyLocal case where $DISPLAY does
277 * not match an authorization entry. For this we
278 * just try "xauth list unix:displaynum.screennum".
279 * XXX: "localhost" match to determine FamilyLocal
282 if (strncmp(display, "localhost:", 10) == 0) {
283 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
288 xauthdir = xmalloc(MAXPATHLEN);
289 xauthfile = xmalloc(MAXPATHLEN);
290 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
291 if (mkdtemp(xauthdir) != NULL) {
293 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
295 snprintf(cmd, sizeof(cmd),
296 "%s -f %s generate %s " SSH_X11_PROTO
297 " untrusted timeout 1200 2>" _PATH_DEVNULL,
298 xauth_path, xauthfile, display);
299 debug2("x11_get_proto: %s", cmd);
300 if (system(cmd) == 0)
306 * When in untrusted mode, we read the cookie only if it was
307 * successfully generated as an untrusted one in the step
310 if (trusted || generated) {
311 snprintf(cmd, sizeof(cmd),
312 "%s %s%s list %s 2>" _PATH_DEVNULL,
314 generated ? "-f " : "" ,
315 generated ? xauthfile : "",
317 debug2("x11_get_proto: %s", cmd);
319 if (f && fgets(line, sizeof(line), f) &&
320 sscanf(line, "%*s %511s %511s", proto, data) == 2)
325 error("Warning: untrusted X11 forwarding setup failed: "
326 "xauth key data not generated");
339 * If we didn't get authentication data, just make up some
340 * data. The forwarding code will check the validity of the
341 * response anyway, and substitute this data. The X11
342 * server, however, will ignore this fake data and use
343 * whatever authentication mechanisms it was using otherwise
344 * for the local connection.
349 logit("Warning: No xauth data; "
350 "using fake authentication data for X11 forwarding.");
351 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
352 for (i = 0; i < 16; i++) {
355 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
363 * This is called when the interactive is entered. This checks if there is
364 * an EOF coming on stdin. We must check this explicitly, as select() does
365 * not appear to wake up when redirecting from /dev/null.
369 client_check_initial_eof_on_stdin(void)
375 * If standard input is to be "redirected from /dev/null", we simply
376 * mark that we have seen an EOF and send an EOF message to the
377 * server. Otherwise, we try to read a single character; it appears
378 * that for some files, such /dev/null, select() never wakes up for
379 * read for this descriptor, which means that we never get EOF. This
380 * way we will get the EOF if stdin comes from /dev/null or similar.
382 if (stdin_null_flag) {
383 /* Fake EOF on stdin. */
384 debug("Sending eof.");
386 packet_start(SSH_CMSG_EOF);
389 enter_non_blocking();
391 /* Check for immediate EOF on stdin. */
392 len = read(fileno(stdin), buf, 1);
395 * EOF. Record that we have seen it and send
398 debug("Sending eof.");
400 packet_start(SSH_CMSG_EOF);
402 } else if (len > 0) {
404 * Got data. We must store the data in the buffer,
405 * and also process it as an escape character if
408 if ((u_char) buf[0] == escape_char1)
411 buffer_append(&stdin_buffer, buf, 1);
413 leave_non_blocking();
419 * Make packets from buffered stdin data, and buffer them for sending to the
424 client_make_packets_from_stdin_data(void)
428 /* Send buffered stdin data to the server. */
429 while (buffer_len(&stdin_buffer) > 0 &&
430 packet_not_very_much_data_to_write()) {
431 len = buffer_len(&stdin_buffer);
432 /* Keep the packets at reasonable size. */
433 if (len > packet_get_maxsize())
434 len = packet_get_maxsize();
435 packet_start(SSH_CMSG_STDIN_DATA);
436 packet_put_string(buffer_ptr(&stdin_buffer), len);
438 buffer_consume(&stdin_buffer, len);
439 /* If we have a pending EOF, send it now. */
440 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
441 packet_start(SSH_CMSG_EOF);
448 * Checks if the client window has changed, and sends a packet about it to
449 * the server if so. The actual change is detected elsewhere (by a software
450 * interrupt on Unix); this just checks the flag and sends a message if
455 client_check_window_change(void)
459 if (! received_window_change_signal)
462 received_window_change_signal = 0;
464 debug2("client_check_window_change: changed");
467 channel_send_window_changes();
469 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
471 packet_start(SSH_CMSG_WINDOW_SIZE);
472 packet_put_int((u_int)ws.ws_row);
473 packet_put_int((u_int)ws.ws_col);
474 packet_put_int((u_int)ws.ws_xpixel);
475 packet_put_int((u_int)ws.ws_ypixel);
481 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
483 struct global_confirm *gc;
485 if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
488 gc->cb(type, seq, gc->ctx);
489 if (--gc->ref_count <= 0) {
490 TAILQ_REMOVE(&global_confirms, gc, entry);
491 bzero(gc, sizeof(*gc));
495 keep_alive_timeouts = 0;
499 server_alive_check(void)
501 if (++keep_alive_timeouts > options.server_alive_count_max) {
502 logit("Timeout, server not responding.");
505 packet_start(SSH2_MSG_GLOBAL_REQUEST);
506 packet_put_cstring("keepalive@openssh.com");
507 packet_put_char(1); /* boolean: want reply */
509 /* Insert an empty placeholder to maintain ordering */
510 client_register_global_confirm(NULL, NULL);
514 * Waits until the client can do something (some data becomes available on
515 * one of the file descriptors).
518 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
519 int *maxfdp, u_int *nallocp, int rekeying)
521 struct timeval tv, *tvp;
524 /* Add any selections by the channel mechanism. */
525 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
528 /* Read from the connection, unless our buffers are full. */
529 if (buffer_len(&stdout_buffer) < buffer_high &&
530 buffer_len(&stderr_buffer) < buffer_high &&
531 channel_not_very_much_buffered_data())
532 FD_SET(connection_in, *readsetp);
534 * Read from stdin, unless we have seen EOF or have very much
535 * buffered data to send to the server.
537 if (!stdin_eof && packet_not_very_much_data_to_write())
538 FD_SET(fileno(stdin), *readsetp);
540 /* Select stdout/stderr if have data in buffer. */
541 if (buffer_len(&stdout_buffer) > 0)
542 FD_SET(fileno(stdout), *writesetp);
543 if (buffer_len(&stderr_buffer) > 0)
544 FD_SET(fileno(stderr), *writesetp);
546 /* channel_prepare_select could have closed the last channel */
547 if (session_closed && !channel_still_open() &&
548 !packet_have_data_to_write()) {
549 /* clear mask since we did not call select() */
550 memset(*readsetp, 0, *nallocp);
551 memset(*writesetp, 0, *nallocp);
554 FD_SET(connection_in, *readsetp);
558 /* Select server connection if have data to write to the server. */
559 if (packet_have_data_to_write())
560 FD_SET(connection_out, *writesetp);
562 if (muxserver_sock != -1)
563 FD_SET(muxserver_sock, *readsetp);
566 * Wait for something to happen. This will suspend the process until
567 * some selected descriptor can be read, written, or has some other
571 if (options.server_alive_interval == 0 || !compat20)
574 tv.tv_sec = options.server_alive_interval;
578 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
583 * We have to clear the select masks, because we return.
584 * We have to return, because the mainloop checks for the flags
585 * set by the signal handlers.
587 memset(*readsetp, 0, *nallocp);
588 memset(*writesetp, 0, *nallocp);
592 /* Note: we might still have data in the buffers. */
593 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
594 buffer_append(&stderr_buffer, buf, strlen(buf));
597 server_alive_check();
601 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
603 /* Flush stdout and stderr buffers. */
604 if (buffer_len(bout) > 0)
605 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
607 if (buffer_len(berr) > 0)
608 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
614 * Free (and clear) the buffer to reduce the amount of data that gets
621 /* Send the suspend signal to the program itself. */
622 kill(getpid(), SIGTSTP);
624 /* Reset window sizes in case they have changed */
625 received_window_change_signal = 1;
627 /* OK, we have been continued by the user. Reinitialize buffers. */
636 client_process_net_input(fd_set *readset)
642 * Read input from the server, and add any such data to the buffer of
643 * the packet subsystem.
645 if (FD_ISSET(connection_in, readset)) {
646 /* Read as much as possible. */
647 len = read(connection_in, buf, sizeof(buf));
650 * Received EOF. The remote host has closed the
653 snprintf(buf, sizeof buf,
654 "Connection to %.300s closed by remote host.\r\n",
656 buffer_append(&stderr_buffer, buf, strlen(buf));
661 * There is a kernel bug on Solaris that causes select to
662 * sometimes wake up even though there is no data available.
665 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
670 * An error has encountered. Perhaps there is a
673 snprintf(buf, sizeof buf,
674 "Read from remote host %.300s: %.100s\r\n",
675 host, strerror(errno));
676 buffer_append(&stderr_buffer, buf, strlen(buf));
680 packet_process_incoming(buf, len);
685 client_status_confirm(int type, Channel *c, void *ctx)
687 struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
691 /* XXX supress on mux _client_ quietmode */
692 tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
693 c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
695 if (type == SSH2_MSG_CHANNEL_SUCCESS) {
696 debug2("%s request accepted on channel %d",
697 cr->request_type, c->self);
698 } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
700 snprintf(errmsg, sizeof(errmsg),
701 "%s request failed\r\n", cr->request_type);
703 snprintf(errmsg, sizeof(errmsg),
704 "%s request failed on channel %d",
705 cr->request_type, c->self);
707 /* If error occurred on primary session channel, then exit */
708 if (cr->do_close && c->self == session_ident)
710 /* If error occurred on mux client, append to their stderr */
712 buffer_append(&c->extended, errmsg, strlen(errmsg));
717 chan_write_failed(c);
724 client_abandon_status_confirm(Channel *c, void *ctx)
730 client_expect_confirm(int id, const char *request, int do_close)
732 struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
734 cr->request_type = request;
735 cr->do_close = do_close;
737 channel_register_status_confirm(id, client_status_confirm,
738 client_abandon_status_confirm, cr);
742 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
744 struct global_confirm *gc, *last_gc;
746 /* Coalesce identical callbacks */
747 last_gc = TAILQ_LAST(&global_confirms, global_confirms);
748 if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
749 if (++last_gc->ref_count >= INT_MAX)
750 fatal("%s: last_gc->ref_count = %d",
751 __func__, last_gc->ref_count);
755 gc = xmalloc(sizeof(*gc));
759 TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
763 process_cmdline(void)
765 void (*handler)(int);
766 char *s, *cmd, *cancel_host;
772 bzero(&fwd, sizeof(fwd));
773 fwd.listen_host = fwd.connect_host = NULL;
776 handler = signal(SIGINT, SIG_IGN);
777 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
783 s++; /* Skip cmdline '-', if any */
787 if (*s == 'h' || *s == 'H' || *s == '?') {
789 logit(" -L[bind_address:]port:host:hostport "
790 "Request local forward");
791 logit(" -R[bind_address:]port:host:hostport "
792 "Request remote forward");
793 logit(" -KR[bind_address:]port "
794 "Cancel remote forward");
795 if (!options.permit_local_command)
798 "Execute local command");
802 if (*s == '!' && options.permit_local_command) {
812 if (*s != 'L' && *s != 'R') {
813 logit("Invalid command.");
818 if (local && delete) {
819 logit("Not supported.");
822 if ((!local || delete) && !compat20) {
823 logit("Not supported for SSH protocol version 1.");
827 while (isspace(*++s))
832 cancel_host = hpdelim(&s); /* may be NULL */
834 cancel_port = a2port(s);
835 cancel_host = cleanhostname(cancel_host);
837 cancel_port = a2port(cancel_host);
840 if (cancel_port == 0) {
841 logit("Bad forwarding close port");
844 channel_request_rforward_cancel(cancel_host, cancel_port);
846 if (!parse_forward(&fwd, s)) {
847 logit("Bad forwarding specification.");
851 if (channel_setup_local_fwd_listener(fwd.listen_host,
852 fwd.listen_port, fwd.connect_host,
853 fwd.connect_port, options.gateway_ports,
854 options.hpn_disabled, options.hpn_buffer_size) < 0) {
855 logit("Port forwarding failed.");
859 if (channel_request_remote_forwarding(fwd.listen_host,
860 fwd.listen_port, fwd.connect_host,
861 fwd.connect_port) < 0) {
862 logit("Port forwarding failed.");
867 logit("Forwarding port.");
871 signal(SIGINT, handler);
875 if (fwd.listen_host != NULL)
876 xfree(fwd.listen_host);
877 if (fwd.connect_host != NULL)
878 xfree(fwd.connect_host);
882 * Process the characters one by one, call with c==NULL for proto1 case.
885 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
894 int *escape_pendingp, escape_char;
895 struct escape_filter_ctx *efc;
898 escape_pendingp = &escape_pending1;
899 escape_char = escape_char1;
901 if (c->filter_ctx == NULL)
903 efc = (struct escape_filter_ctx *)c->filter_ctx;
904 escape_pendingp = &efc->escape_pending;
905 escape_char = efc->escape_char;
911 for (i = 0; i < (u_int)len; i++) {
912 /* Get one character at a time. */
915 if (*escape_pendingp) {
916 /* We have previously seen an escape character. */
917 /* Clear the flag now. */
918 *escape_pendingp = 0;
920 /* Process the escaped character. */
923 /* Terminate the connection. */
924 snprintf(string, sizeof string, "%c.\r\n",
926 buffer_append(berr, string, strlen(string));
928 if (c && c->ctl_fd != -1) {
930 chan_write_failed(c);
937 /* XXX support this for mux clients */
938 if (c && c->ctl_fd != -1) {
940 snprintf(string, sizeof string,
941 "%c%c escape not available to "
942 "multiplexed sessions\r\n",
944 buffer_append(berr, string,
948 /* Suspend the program. Inform the user */
949 snprintf(string, sizeof string,
950 "%c^Z [suspend ssh]\r\n", escape_char);
951 buffer_append(berr, string, strlen(string));
953 /* Restore terminal modes and suspend. */
954 client_suspend_self(bin, bout, berr);
956 /* We have been continued. */
961 snprintf(string, sizeof string,
962 "%cB\r\n", escape_char);
963 buffer_append(berr, string,
965 channel_request_start(session_ident,
967 packet_put_int(1000);
974 if (datafellows & SSH_BUG_NOREKEY)
975 logit("Server does not "
976 "support re-keying");
983 if (c && c->ctl_fd != -1)
986 * Detach the program (continue to serve
987 * connections, but put in background and no
988 * more new connections).
990 /* Restore tty modes. */
993 /* Stop listening for new connections. */
994 channel_stop_listening();
996 snprintf(string, sizeof string,
997 "%c& [backgrounded]\n", escape_char);
998 buffer_append(berr, string, strlen(string));
1000 /* Fork into background. */
1003 error("fork: %.100s", strerror(errno));
1006 if (pid != 0) { /* This is the parent. */
1007 /* The parent just exits. */
1010 /* The child continues serving connections. */
1012 buffer_append(bin, "\004", 1);
1013 /* fake EOF on stdin */
1015 } else if (!stdin_eof) {
1017 * Sending SSH_CMSG_EOF alone does not
1018 * always appear to be enough. So we
1019 * try to send an EOF character first.
1021 packet_start(SSH_CMSG_STDIN_DATA);
1022 packet_put_string("\004", 1);
1026 if (buffer_len(bin) == 0) {
1027 packet_start(SSH_CMSG_EOF);
1034 if (c && c->ctl_fd != -1) {
1035 snprintf(string, sizeof string,
1037 Supported escape sequences:\r\n\
1038 %c. - terminate session\r\n\
1039 %cB - send a BREAK to the remote system\r\n\
1040 %cC - open a command line\r\n\
1041 %cR - Request rekey (SSH protocol 2 only)\r\n\
1042 %c# - list forwarded connections\r\n\
1043 %c? - this message\r\n\
1044 %c%c - send the escape character by typing it twice\r\n\
1045 (Note that escapes are only recognized immediately after newline.)\r\n",
1046 escape_char, escape_char,
1047 escape_char, escape_char,
1048 escape_char, escape_char,
1049 escape_char, escape_char,
1052 snprintf(string, sizeof string,
1054 Supported escape sequences:\r\n\
1055 %c. - terminate connection (and any multiplexed sessions)\r\n\
1056 %cB - send a BREAK to the remote system\r\n\
1057 %cC - open a command line\r\n\
1058 %cR - Request rekey (SSH protocol 2 only)\r\n\
1059 %c^Z - suspend ssh\r\n\
1060 %c# - list forwarded connections\r\n\
1061 %c& - background ssh (when waiting for connections to terminate)\r\n\
1062 %c? - this message\r\n\
1063 %c%c - send the escape character by typing it twice\r\n\
1064 (Note that escapes are only recognized immediately after newline.)\r\n",
1065 escape_char, escape_char,
1066 escape_char, escape_char,
1067 escape_char, escape_char,
1068 escape_char, escape_char,
1069 escape_char, escape_char,
1072 buffer_append(berr, string, strlen(string));
1076 snprintf(string, sizeof string, "%c#\r\n",
1078 buffer_append(berr, string, strlen(string));
1079 s = channel_open_message();
1080 buffer_append(berr, s, strlen(s));
1089 if (ch != escape_char) {
1090 buffer_put_char(bin, escape_char);
1093 /* Escaped characters fall through here */
1098 * The previous character was not an escape char.
1099 * Check if this is an escape.
1101 if (last_was_cr && ch == escape_char) {
1103 * It is. Set the flag and continue to
1106 *escape_pendingp = 1;
1112 * Normal character. Record whether it was a newline,
1113 * and append it to the buffer.
1115 last_was_cr = (ch == '\r' || ch == '\n');
1116 buffer_put_char(bin, ch);
1123 client_process_input(fd_set *readset)
1128 /* Read input from stdin. */
1129 if (FD_ISSET(fileno(stdin), readset)) {
1130 /* Read as much as possible. */
1131 len = read(fileno(stdin), buf, sizeof(buf));
1133 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1134 return; /* we'll try again later */
1137 * Received EOF or error. They are treated
1138 * similarly, except that an error message is printed
1139 * if it was an error condition.
1142 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1144 buffer_append(&stderr_buffer, buf, strlen(buf));
1146 /* Mark that we have seen EOF. */
1149 * Send an EOF message to the server unless there is
1150 * data in the buffer. If there is data in the
1151 * buffer, no message will be sent now. Code
1152 * elsewhere will send the EOF when the buffer
1153 * becomes empty if stdin_eof is set.
1155 if (buffer_len(&stdin_buffer) == 0) {
1156 packet_start(SSH_CMSG_EOF);
1159 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1161 * Normal successful read, and no escape character.
1162 * Just append the data to buffer.
1164 buffer_append(&stdin_buffer, buf, len);
1167 * Normal, successful read. But we have an escape
1168 * character and have to process the characters one
1171 if (process_escapes(NULL, &stdin_buffer,
1172 &stdout_buffer, &stderr_buffer, buf, len) == -1)
1179 client_process_output(fd_set *writeset)
1184 /* Write buffered output to stdout. */
1185 if (FD_ISSET(fileno(stdout), writeset)) {
1186 /* Write as much data as possible. */
1187 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1188 buffer_len(&stdout_buffer));
1190 if (errno == EINTR || errno == EAGAIN ||
1191 errno == EWOULDBLOCK)
1195 * An error or EOF was encountered. Put an
1196 * error message to stderr buffer.
1198 snprintf(buf, sizeof buf,
1199 "write stdout: %.50s\r\n", strerror(errno));
1200 buffer_append(&stderr_buffer, buf, strlen(buf));
1205 /* Consume printed data from the buffer. */
1206 buffer_consume(&stdout_buffer, len);
1208 /* Write buffered output to stderr. */
1209 if (FD_ISSET(fileno(stderr), writeset)) {
1210 /* Write as much data as possible. */
1211 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1212 buffer_len(&stderr_buffer));
1214 if (errno == EINTR || errno == EAGAIN ||
1215 errno == EWOULDBLOCK)
1219 * EOF or error, but can't even print
1226 /* Consume printed characters from the buffer. */
1227 buffer_consume(&stderr_buffer, len);
1232 * Get packets from the connection input buffer, and process them as long as
1233 * there are packets available.
1235 * Any unknown packets received during the actual
1236 * session cause the session to terminate. This is
1237 * intended to make debugging easier since no
1238 * confirmations are sent. Any compatible protocol
1239 * extensions must be negotiated during the
1240 * preparatory phase.
1244 client_process_buffered_input_packets(void)
1246 dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1247 compat20 ? xxx_kex : NULL);
1250 /* scan buf[] for '~' before sending data to the peer */
1252 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1254 client_new_escape_filter_ctx(int escape_char)
1256 struct escape_filter_ctx *ret;
1258 ret = xmalloc(sizeof(*ret));
1259 ret->escape_pending = 0;
1260 ret->escape_char = escape_char;
1264 /* Free the escape filter context on channel free */
1266 client_filter_cleanup(int cid, void *ctx)
1272 client_simple_escape_filter(Channel *c, char *buf, int len)
1274 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1277 return process_escapes(c, &c->input, &c->output, &c->extended,
1282 client_channel_closed(int id, void *arg)
1284 channel_cancel_cleanup(id);
1290 * Implements the interactive session with the server. This is called after
1291 * the user has been authenticated, and a command has been started on the
1292 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1293 * used as an escape character for terminating or suspending the session.
1297 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1299 fd_set *readset = NULL, *writeset = NULL;
1300 double start_time, total_time;
1301 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1302 u_int64_t ibytes, obytes;
1306 debug("Entering interactive session.");
1308 start_time = get_current_time();
1310 /* Initialize variables. */
1311 escape_pending1 = 0;
1315 buffer_high = 64 * 1024;
1316 connection_in = packet_get_connection_in();
1317 connection_out = packet_get_connection_out();
1318 max_fd = MAX(connection_in, connection_out);
1319 if (muxserver_sock != -1)
1320 max_fd = MAX(max_fd, muxserver_sock);
1323 /* enable nonblocking unless tty */
1324 if (!isatty(fileno(stdin)))
1325 set_nonblock(fileno(stdin));
1326 if (!isatty(fileno(stdout)))
1327 set_nonblock(fileno(stdout));
1328 if (!isatty(fileno(stderr)))
1329 set_nonblock(fileno(stderr));
1330 max_fd = MAX(max_fd, fileno(stdin));
1331 max_fd = MAX(max_fd, fileno(stdout));
1332 max_fd = MAX(max_fd, fileno(stderr));
1335 escape_char1 = escape_char_arg;
1337 /* Initialize buffers. */
1338 buffer_init(&stdin_buffer);
1339 buffer_init(&stdout_buffer);
1340 buffer_init(&stderr_buffer);
1342 client_init_dispatch();
1345 * Set signal handlers, (e.g. to restore non-blocking mode)
1346 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1348 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1349 signal(SIGHUP, signal_handler);
1350 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1351 signal(SIGINT, signal_handler);
1352 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1353 signal(SIGQUIT, signal_handler);
1354 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1355 signal(SIGTERM, signal_handler);
1356 signal(SIGWINCH, window_change_handler);
1362 session_ident = ssh2_chan_id;
1363 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1364 channel_register_filter(session_ident,
1365 client_simple_escape_filter, NULL,
1366 client_filter_cleanup,
1367 client_new_escape_filter_ctx(escape_char_arg));
1368 if (session_ident != -1)
1369 channel_register_cleanup(session_ident,
1370 client_channel_closed, 0);
1372 /* Check if we should immediately send eof on stdin. */
1373 client_check_initial_eof_on_stdin();
1376 /* Main loop of the client for the interactive session mode. */
1377 while (!quit_pending) {
1379 /* Process buffered packets sent by the server. */
1380 client_process_buffered_input_packets();
1382 if (compat20 && session_closed && !channel_still_open())
1385 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1388 debug("rekeying in progress");
1391 * Make packets of buffered stdin data, and buffer
1392 * them for sending to the server.
1395 client_make_packets_from_stdin_data();
1398 * Make packets from buffered channel data, and
1399 * enqueue them for sending to the server.
1401 if (packet_not_very_much_data_to_write())
1402 channel_output_poll();
1405 * Check if the window size has changed, and buffer a
1406 * message about it to the server if so.
1408 client_check_window_change();
1414 * Wait until we have something to do (something becomes
1415 * available on one of the descriptors).
1418 client_wait_until_can_do_something(&readset, &writeset,
1419 &max_fd2, &nalloc, rekeying);
1424 /* Do channel operations unless rekeying in progress. */
1426 channel_after_select(readset, writeset);
1427 if (need_rekeying || packet_need_rekeying()) {
1428 debug("need rekeying");
1430 kex_send_kexinit(xxx_kex);
1435 /* Buffer input from the connection. */
1436 client_process_net_input(readset);
1438 /* Accept control connections. */
1439 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1440 if (muxserver_accept_control())
1448 /* Buffer data from stdin */
1449 client_process_input(readset);
1451 * Process output to stdout and stderr. Output to
1452 * the connection is processed elsewhere (above).
1454 client_process_output(writeset);
1458 * Send as much buffered packet data as possible to the
1461 if (FD_ISSET(connection_out, writeset))
1462 packet_write_poll();
1469 /* Terminate the session. */
1471 /* Stop watching for window change. */
1472 signal(SIGWINCH, SIG_DFL);
1479 /* restore blocking io */
1480 if (!isatty(fileno(stdin)))
1481 unset_nonblock(fileno(stdin));
1482 if (!isatty(fileno(stdout)))
1483 unset_nonblock(fileno(stdout));
1484 if (!isatty(fileno(stderr)))
1485 unset_nonblock(fileno(stderr));
1488 * If there was no shell or command requested, there will be no remote
1489 * exit status to be returned. In that case, clear error code if the
1490 * connection was deliberately terminated at this end.
1492 if (no_shell_flag && received_signal == SIGTERM) {
1493 received_signal = 0;
1497 if (received_signal)
1498 fatal("Killed by signal %d.", (int) received_signal);
1501 * In interactive mode (with pseudo tty) display a message indicating
1502 * that the connection has been closed.
1504 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1505 snprintf(buf, sizeof buf,
1506 "Connection to %.64s closed.\r\n", host);
1507 buffer_append(&stderr_buffer, buf, strlen(buf));
1510 /* Output any buffered data for stdout. */
1511 while (buffer_len(&stdout_buffer) > 0) {
1512 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1513 buffer_len(&stdout_buffer));
1515 error("Write failed flushing stdout buffer.");
1518 buffer_consume(&stdout_buffer, len);
1521 /* Output any buffered data for stderr. */
1522 while (buffer_len(&stderr_buffer) > 0) {
1523 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1524 buffer_len(&stderr_buffer));
1526 error("Write failed flushing stderr buffer.");
1529 buffer_consume(&stderr_buffer, len);
1532 /* Clear and free any buffers. */
1533 memset(buf, 0, sizeof(buf));
1534 buffer_free(&stdin_buffer);
1535 buffer_free(&stdout_buffer);
1536 buffer_free(&stderr_buffer);
1538 /* Report bytes transferred, and transfer rates. */
1539 total_time = get_current_time() - start_time;
1540 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1541 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1542 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1543 obytes, ibytes, total_time);
1545 verbose("Bytes per second: sent %.1f, received %.1f",
1546 obytes / total_time, ibytes / total_time);
1547 /* Return the exit status of the program. */
1548 debug("Exit status %d", exit_status);
1555 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1558 char *data = packet_get_string(&data_len);
1560 buffer_append(&stdout_buffer, data, data_len);
1561 memset(data, 0, data_len);
1565 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1568 char *data = packet_get_string(&data_len);
1570 buffer_append(&stderr_buffer, data, data_len);
1571 memset(data, 0, data_len);
1575 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1577 exit_status = packet_get_int();
1579 /* Acknowledge the exit. */
1580 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1583 * Must wait for packet to be sent since we are
1586 packet_write_wait();
1587 /* Flag that we want to exit. */
1591 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1594 int remote_id, sock;
1596 /* Read the remote channel number from the message. */
1597 remote_id = packet_get_int();
1601 * Get a connection to the local authentication agent (this may again
1604 sock = ssh_get_authentication_socket();
1607 * If we could not connect the agent, send an error message back to
1608 * the server. This should never happen unless the agent dies,
1609 * because authentication forwarding is only enabled if we have an
1613 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1614 -1, 0, 0, 0, "authentication agent connection", 1);
1615 c->remote_id = remote_id;
1619 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1620 packet_put_int(remote_id);
1622 /* Send a confirmation to the remote host. */
1623 debug("Forwarding authentication connection.");
1624 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1625 packet_put_int(remote_id);
1626 packet_put_int(c->self);
1632 client_request_forwarded_tcpip(const char *request_type, int rchan)
1635 char *listen_address, *originator_address;
1636 int listen_port, originator_port;
1638 /* Get rest of the packet */
1639 listen_address = packet_get_string(NULL);
1640 listen_port = packet_get_int();
1641 originator_address = packet_get_string(NULL);
1642 originator_port = packet_get_int();
1645 debug("client_request_forwarded_tcpip: listen %s port %d, "
1646 "originator %s port %d", listen_address, listen_port,
1647 originator_address, originator_port);
1649 c = channel_connect_by_listen_address(listen_port,
1650 "forwarded-tcpip", originator_address);
1652 xfree(originator_address);
1653 xfree(listen_address);
1658 client_request_x11(const char *request_type, int rchan)
1662 int originator_port;
1665 if (!options.forward_x11) {
1666 error("Warning: ssh server tried X11 forwarding.");
1667 error("Warning: this is probably a break-in attempt by a "
1668 "malicious server.");
1671 originator = packet_get_string(NULL);
1672 if (datafellows & SSH_BUG_X11FWD) {
1673 debug2("buggy server: x11 request w/o originator_port");
1674 originator_port = 0;
1676 originator_port = packet_get_int();
1679 /* XXX check permission */
1680 debug("client_request_x11: request from %s %d", originator,
1683 sock = x11_connect_display();
1686 /* again is this really necessary for X11? */
1687 if (options.hpn_disabled)
1688 c = channel_new("x11",
1689 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1690 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1692 c = channel_new("x11",
1693 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1694 options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1700 client_request_agent(const char *request_type, int rchan)
1705 if (!options.forward_agent) {
1706 error("Warning: ssh server tried agent forwarding.");
1707 error("Warning: this is probably a break-in attempt by a "
1708 "malicious server.");
1711 sock = ssh_get_authentication_socket();
1714 /* not sure this is really needed here either */
1715 if (options.hpn_disabled)
1716 c = channel_new("authentication agent connection",
1717 SSH_CHANNEL_OPEN, sock, sock, -1,
1718 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1719 "authentication agent connection", 1);
1721 c = channel_new("authentication agent connection",
1722 SSH_CHANNEL_OPEN, sock, sock, -1,
1723 options.hpn_buffer_size, options.hpn_buffer_size, 0,
1724 "authentication agent connection", 1);
1730 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1735 if (tun_mode == SSH_TUNMODE_NO)
1739 error("Tunnel forwarding is not support for protocol 1");
1743 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1745 /* Open local tunnel device */
1746 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1747 error("Tunnel device open failed.");
1751 if(options.hpn_disabled)
1752 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1753 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1756 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1757 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1761 #if defined(SSH_TUN_FILTER)
1762 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1763 channel_register_filter(c->self, sys_tun_infilter,
1764 sys_tun_outfilter, NULL, NULL);
1767 packet_start(SSH2_MSG_CHANNEL_OPEN);
1768 packet_put_cstring("tun@openssh.com");
1769 packet_put_int(c->self);
1770 packet_put_int(c->local_window_max);
1771 packet_put_int(c->local_maxpacket);
1772 packet_put_int(tun_mode);
1773 packet_put_int(remote_tun);
1779 /* XXXX move to generic input handler */
1781 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1786 u_int rmaxpack, rwindow, len;
1788 ctype = packet_get_string(&len);
1789 rchan = packet_get_int();
1790 rwindow = packet_get_int();
1791 rmaxpack = packet_get_int();
1793 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1794 ctype, rchan, rwindow, rmaxpack);
1796 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1797 c = client_request_forwarded_tcpip(ctype, rchan);
1798 } else if (strcmp(ctype, "x11") == 0) {
1799 c = client_request_x11(ctype, rchan);
1800 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1801 c = client_request_agent(ctype, rchan);
1803 /* XXX duplicate : */
1805 debug("confirm %s", ctype);
1806 c->remote_id = rchan;
1807 c->remote_window = rwindow;
1808 c->remote_maxpacket = rmaxpack;
1809 if (c->type != SSH_CHANNEL_CONNECTING) {
1810 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1811 packet_put_int(c->remote_id);
1812 packet_put_int(c->self);
1813 packet_put_int(c->local_window);
1814 packet_put_int(c->local_maxpacket);
1818 debug("failure %s", ctype);
1819 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1820 packet_put_int(rchan);
1821 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1822 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1823 packet_put_cstring("open failed");
1824 packet_put_cstring("");
1831 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1834 int exitval, id, reply, success = 0;
1837 id = packet_get_int();
1838 rtype = packet_get_string(NULL);
1839 reply = packet_get_char();
1841 debug("client_input_channel_req: channel %d rtype %s reply %d",
1845 error("client_input_channel_req: request for channel -1");
1846 } else if ((c = channel_lookup(id)) == NULL) {
1847 error("client_input_channel_req: channel %d: "
1848 "unknown channel", id);
1849 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1852 } else if (strcmp(rtype, "exit-status") == 0) {
1853 exitval = packet_get_int();
1854 if (id == session_ident) {
1856 exit_status = exitval;
1857 } else if (c->ctl_fd == -1) {
1858 error("client_input_channel_req: unexpected channel %d",
1861 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1867 packet_start(success ?
1868 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1875 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1881 rtype = packet_get_string(NULL);
1882 want_reply = packet_get_char();
1883 debug("client_input_global_request: rtype %s want_reply %d",
1886 packet_start(success ?
1887 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1889 packet_write_wait();
1895 client_session2_setup(int id, int want_tty, int want_subsystem,
1896 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1901 debug2("%s: id %d", __func__, id);
1903 if ((c = channel_lookup(id)) == NULL)
1904 fatal("client_session2_setup: channel %d: unknown channel", id);
1909 /* Store window size in the packet. */
1910 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1911 memset(&ws, 0, sizeof(ws));
1913 channel_request_start(id, "pty-req", 1);
1914 client_expect_confirm(id, "PTY allocation", 0);
1915 packet_put_cstring(term != NULL ? term : "");
1916 packet_put_int((u_int)ws.ws_col);
1917 packet_put_int((u_int)ws.ws_row);
1918 packet_put_int((u_int)ws.ws_xpixel);
1919 packet_put_int((u_int)ws.ws_ypixel);
1921 tiop = get_saved_tio();
1922 tty_make_modes(-1, tiop);
1924 /* XXX wait for reply */
1928 /* Transfer any environment variables from client to server */
1929 if (options.num_send_env != 0 && env != NULL) {
1933 debug("Sending environment.");
1934 for (i = 0; env[i] != NULL; i++) {
1936 name = xstrdup(env[i]);
1937 if ((val = strchr(name, '=')) == NULL) {
1944 for (j = 0; j < options.num_send_env; j++) {
1945 if (match_pattern(name, options.send_env[j])) {
1951 debug3("Ignored env %s", name);
1956 debug("Sending env %s = %s", name, val);
1957 channel_request_start(id, "env", 0);
1958 packet_put_cstring(name);
1959 packet_put_cstring(val);
1965 len = buffer_len(cmd);
1969 if (want_subsystem) {
1970 debug("Sending subsystem: %.*s",
1971 len, (u_char*)buffer_ptr(cmd));
1972 channel_request_start(id, "subsystem", 1);
1973 client_expect_confirm(id, "subsystem", 1);
1975 debug("Sending command: %.*s",
1976 len, (u_char*)buffer_ptr(cmd));
1977 channel_request_start(id, "exec", 1);
1978 client_expect_confirm(id, "exec", 1);
1980 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1983 channel_request_start(id, "shell", 1);
1984 client_expect_confirm(id, "shell", 1);
1990 client_init_dispatch_20(void)
1992 dispatch_init(&dispatch_protocol_error);
1994 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1995 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1996 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1997 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1998 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1999 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2000 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2001 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2002 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2003 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2004 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2005 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2008 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2010 /* global request reply messages */
2011 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2012 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2016 client_init_dispatch_13(void)
2018 dispatch_init(NULL);
2019 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2020 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2021 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2022 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2023 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2024 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2025 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2026 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2027 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2029 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2030 &client_input_agent_open : &deny_input_open);
2031 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2032 &x11_input_open : &deny_input_open);
2036 client_init_dispatch_15(void)
2038 client_init_dispatch_13();
2039 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2040 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2044 client_init_dispatch(void)
2047 client_init_dispatch_20();
2049 client_init_dispatch_13();
2051 client_init_dispatch_15();
2054 /* client specific fatal cleanup */
2059 leave_non_blocking();
2060 if (options.control_path != NULL && muxserver_sock != -1)
2061 unlink(options.control_path);