1 /* $OpenBSD: clientloop.c,v 1.193 2008/05/09 16:21:13 markus 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_char; /* Escape character. */
148 static int escape_pending; /* Last character was the escape character */
149 static int last_was_cr; /* Last character was a newline. */
150 static int exit_status; /* Used to store the exit status of the command. */
151 static int stdin_eof; /* EOF has been encountered on standard error. */
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_long stdin_bytes, stdout_bytes, stderr_bytes;
156 static u_int buffer_high;/* Soft max buffer size. */
157 static int connection_in; /* Connection to server (input). */
158 static int connection_out; /* Connection to server (output). */
159 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
160 static int session_closed = 0; /* In SSH2: login session closed. */
162 static void client_init_dispatch(void);
163 int session_ident = -1;
165 struct channel_reply_ctx {
166 const char *request_type;
173 void ssh_process_session2_setup(int, int, int, Buffer *);
175 /* Restores stdin to blocking mode. */
178 leave_non_blocking(void)
180 if (in_non_blocking_mode) {
181 unset_nonblock(fileno(stdin));
182 in_non_blocking_mode = 0;
186 /* Puts stdin terminal in non-blocking mode. */
189 enter_non_blocking(void)
191 in_non_blocking_mode = 1;
192 set_nonblock(fileno(stdin));
196 * Signal handler for the window change signal (SIGWINCH). This just sets a
197 * flag indicating that the window has changed.
201 window_change_handler(int sig)
203 received_window_change_signal = 1;
204 signal(SIGWINCH, window_change_handler);
208 * Signal handler for signals that cause the program to terminate. These
209 * signals must be trapped to restore terminal modes.
213 signal_handler(int sig)
215 received_signal = sig;
220 * Returns current time in seconds from Jan 1, 1970 with the maximum
221 * available resolution.
225 get_current_time(void)
228 gettimeofday(&tv, NULL);
229 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
232 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
234 client_x11_get_proto(const char *display, const char *xauth_path,
235 u_int trusted, char **_proto, char **_data)
240 static char proto[512], data[512];
242 int got_data = 0, generated = 0, do_unlink = 0, i;
243 char *xauthdir, *xauthfile;
246 xauthdir = xauthfile = NULL;
249 proto[0] = data[0] = '\0';
251 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
252 debug("No xauth program.");
254 if (display == NULL) {
255 debug("x11_get_proto: DISPLAY not set");
259 * Handle FamilyLocal case where $DISPLAY does
260 * not match an authorization entry. For this we
261 * just try "xauth list unix:displaynum.screennum".
262 * XXX: "localhost" match to determine FamilyLocal
265 if (strncmp(display, "localhost:", 10) == 0) {
266 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
271 xauthdir = xmalloc(MAXPATHLEN);
272 xauthfile = xmalloc(MAXPATHLEN);
273 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
274 if (mkdtemp(xauthdir) != NULL) {
276 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
278 snprintf(cmd, sizeof(cmd),
279 "%s -f %s generate %s " SSH_X11_PROTO
280 " untrusted timeout 1200 2>" _PATH_DEVNULL,
281 xauth_path, xauthfile, display);
282 debug2("x11_get_proto: %s", cmd);
283 if (system(cmd) == 0)
289 * When in untrusted mode, we read the cookie only if it was
290 * successfully generated as an untrusted one in the step
293 if (trusted || generated) {
294 snprintf(cmd, sizeof(cmd),
295 "%s %s%s list %s 2>" _PATH_DEVNULL,
297 generated ? "-f " : "" ,
298 generated ? xauthfile : "",
300 debug2("x11_get_proto: %s", cmd);
302 if (f && fgets(line, sizeof(line), f) &&
303 sscanf(line, "%*s %511s %511s", proto, data) == 2)
308 error("Warning: untrusted X11 forwarding setup failed: "
309 "xauth key data not generated");
322 * If we didn't get authentication data, just make up some
323 * data. The forwarding code will check the validity of the
324 * response anyway, and substitute this data. The X11
325 * server, however, will ignore this fake data and use
326 * whatever authentication mechanisms it was using otherwise
327 * for the local connection.
332 logit("Warning: No xauth data; "
333 "using fake authentication data for X11 forwarding.");
334 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
335 for (i = 0; i < 16; i++) {
338 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
346 * This is called when the interactive is entered. This checks if there is
347 * an EOF coming on stdin. We must check this explicitly, as select() does
348 * not appear to wake up when redirecting from /dev/null.
352 client_check_initial_eof_on_stdin(void)
358 * If standard input is to be "redirected from /dev/null", we simply
359 * mark that we have seen an EOF and send an EOF message to the
360 * server. Otherwise, we try to read a single character; it appears
361 * that for some files, such /dev/null, select() never wakes up for
362 * read for this descriptor, which means that we never get EOF. This
363 * way we will get the EOF if stdin comes from /dev/null or similar.
365 if (stdin_null_flag) {
366 /* Fake EOF on stdin. */
367 debug("Sending eof.");
369 packet_start(SSH_CMSG_EOF);
372 enter_non_blocking();
374 /* Check for immediate EOF on stdin. */
375 len = read(fileno(stdin), buf, 1);
377 /* EOF. Record that we have seen it and send EOF to server. */
378 debug("Sending eof.");
380 packet_start(SSH_CMSG_EOF);
382 } else if (len > 0) {
384 * Got data. We must store the data in the buffer,
385 * and also process it as an escape character if
388 if ((u_char) buf[0] == escape_char)
391 buffer_append(&stdin_buffer, buf, 1);
393 leave_non_blocking();
399 * Make packets from buffered stdin data, and buffer them for sending to the
404 client_make_packets_from_stdin_data(void)
408 /* Send buffered stdin data to the server. */
409 while (buffer_len(&stdin_buffer) > 0 &&
410 packet_not_very_much_data_to_write()) {
411 len = buffer_len(&stdin_buffer);
412 /* Keep the packets at reasonable size. */
413 if (len > packet_get_maxsize())
414 len = packet_get_maxsize();
415 packet_start(SSH_CMSG_STDIN_DATA);
416 packet_put_string(buffer_ptr(&stdin_buffer), len);
418 buffer_consume(&stdin_buffer, len);
420 /* If we have a pending EOF, send it now. */
421 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
422 packet_start(SSH_CMSG_EOF);
429 * Checks if the client window has changed, and sends a packet about it to
430 * the server if so. The actual change is detected elsewhere (by a software
431 * interrupt on Unix); this just checks the flag and sends a message if
436 client_check_window_change(void)
440 if (! received_window_change_signal)
443 received_window_change_signal = 0;
445 debug2("client_check_window_change: changed");
448 channel_send_window_changes();
450 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
452 packet_start(SSH_CMSG_WINDOW_SIZE);
453 packet_put_int((u_int)ws.ws_row);
454 packet_put_int((u_int)ws.ws_col);
455 packet_put_int((u_int)ws.ws_xpixel);
456 packet_put_int((u_int)ws.ws_ypixel);
462 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
464 keep_alive_timeouts = 0;
465 client_global_request_reply_fwd(type, seq, ctxt);
469 server_alive_check(void)
471 if (++keep_alive_timeouts > options.server_alive_count_max) {
472 logit("Timeout, server not responding.");
475 packet_start(SSH2_MSG_GLOBAL_REQUEST);
476 packet_put_cstring("keepalive@openssh.com");
477 packet_put_char(1); /* boolean: want reply */
482 * Waits until the client can do something (some data becomes available on
483 * one of the file descriptors).
486 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
487 int *maxfdp, u_int *nallocp, int rekeying)
489 struct timeval tv, *tvp;
492 /* Add any selections by the channel mechanism. */
493 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
496 /* Read from the connection, unless our buffers are full. */
497 if (buffer_len(&stdout_buffer) < buffer_high &&
498 buffer_len(&stderr_buffer) < buffer_high &&
499 channel_not_very_much_buffered_data())
500 FD_SET(connection_in, *readsetp);
502 * Read from stdin, unless we have seen EOF or have very much
503 * buffered data to send to the server.
505 if (!stdin_eof && packet_not_very_much_data_to_write())
506 FD_SET(fileno(stdin), *readsetp);
508 /* Select stdout/stderr if have data in buffer. */
509 if (buffer_len(&stdout_buffer) > 0)
510 FD_SET(fileno(stdout), *writesetp);
511 if (buffer_len(&stderr_buffer) > 0)
512 FD_SET(fileno(stderr), *writesetp);
514 /* channel_prepare_select could have closed the last channel */
515 if (session_closed && !channel_still_open() &&
516 !packet_have_data_to_write()) {
517 /* clear mask since we did not call select() */
518 memset(*readsetp, 0, *nallocp);
519 memset(*writesetp, 0, *nallocp);
522 FD_SET(connection_in, *readsetp);
526 /* Select server connection if have data to write to the server. */
527 if (packet_have_data_to_write())
528 FD_SET(connection_out, *writesetp);
530 if (muxserver_sock != -1)
531 FD_SET(muxserver_sock, *readsetp);
534 * Wait for something to happen. This will suspend the process until
535 * some selected descriptor can be read, written, or has some other
539 if (options.server_alive_interval == 0 || !compat20)
542 tv.tv_sec = options.server_alive_interval;
546 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
551 * We have to clear the select masks, because we return.
552 * We have to return, because the mainloop checks for the flags
553 * set by the signal handlers.
555 memset(*readsetp, 0, *nallocp);
556 memset(*writesetp, 0, *nallocp);
560 /* Note: we might still have data in the buffers. */
561 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
562 buffer_append(&stderr_buffer, buf, strlen(buf));
565 server_alive_check();
569 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
571 /* Flush stdout and stderr buffers. */
572 if (buffer_len(bout) > 0)
573 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
574 if (buffer_len(berr) > 0)
575 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
580 * Free (and clear) the buffer to reduce the amount of data that gets
587 /* Send the suspend signal to the program itself. */
588 kill(getpid(), SIGTSTP);
590 /* Reset window sizes in case they have changed */
591 received_window_change_signal = 1;
593 /* OK, we have been continued by the user. Reinitialize buffers. */
602 client_process_net_input(fd_set *readset)
608 * Read input from the server, and add any such data to the buffer of
609 * the packet subsystem.
611 if (FD_ISSET(connection_in, readset)) {
612 /* Read as much as possible. */
613 len = read(connection_in, buf, sizeof(buf));
615 /* Received EOF. The remote host has closed the connection. */
616 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
618 buffer_append(&stderr_buffer, buf, strlen(buf));
623 * There is a kernel bug on Solaris that causes select to
624 * sometimes wake up even though there is no data available.
626 if (len < 0 && (errno == EAGAIN || errno == EINTR))
630 /* An error has encountered. Perhaps there is a network problem. */
631 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
632 host, strerror(errno));
633 buffer_append(&stderr_buffer, buf, strlen(buf));
637 packet_process_incoming(buf, len);
642 client_status_confirm(int type, Channel *c, void *ctx)
644 struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
648 /* XXX supress on mux _client_ quietmode */
649 tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
650 c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
652 if (type == SSH2_MSG_CHANNEL_SUCCESS) {
653 debug2("%s request accepted on channel %d",
654 cr->request_type, c->self);
655 } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
657 snprintf(errmsg, sizeof(errmsg),
658 "%s request failed\r\n", cr->request_type);
660 snprintf(errmsg, sizeof(errmsg),
661 "%s request failed on channel %d",
662 cr->request_type, c->self);
664 /* If error occurred on primary session channel, then exit */
665 if (cr->do_close && c->self == session_ident)
667 /* If error occurred on mux client, append to their stderr */
669 buffer_append(&c->extended, errmsg, strlen(errmsg));
674 chan_write_failed(c);
681 client_abandon_status_confirm(Channel *c, void *ctx)
687 client_expect_confirm(int id, const char *request, int do_close)
689 struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
691 cr->request_type = request;
692 cr->do_close = do_close;
694 channel_register_status_confirm(id, client_status_confirm,
695 client_abandon_status_confirm, cr);
699 process_cmdline(void)
701 void (*handler)(int);
702 char *s, *cmd, *cancel_host;
708 bzero(&fwd, sizeof(fwd));
709 fwd.listen_host = fwd.connect_host = NULL;
712 handler = signal(SIGINT, SIG_IGN);
713 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
719 s++; /* Skip cmdline '-', if any */
723 if (*s == 'h' || *s == 'H' || *s == '?') {
725 logit(" -L[bind_address:]port:host:hostport "
726 "Request local forward");
727 logit(" -R[bind_address:]port:host:hostport "
728 "Request remote forward");
729 logit(" -KR[bind_address:]port "
730 "Cancel remote forward");
731 if (!options.permit_local_command)
734 "Execute local command");
738 if (*s == '!' && options.permit_local_command) {
748 if (*s != 'L' && *s != 'R') {
749 logit("Invalid command.");
754 if (local && delete) {
755 logit("Not supported.");
758 if ((!local || delete) && !compat20) {
759 logit("Not supported for SSH protocol version 1.");
763 while (isspace(*++s))
768 cancel_host = hpdelim(&s); /* may be NULL */
770 cancel_port = a2port(s);
771 cancel_host = cleanhostname(cancel_host);
773 cancel_port = a2port(cancel_host);
776 if (cancel_port == 0) {
777 logit("Bad forwarding close port");
780 channel_request_rforward_cancel(cancel_host, cancel_port);
782 if (!parse_forward(&fwd, s)) {
783 logit("Bad forwarding specification.");
787 if (channel_setup_local_fwd_listener(fwd.listen_host,
788 fwd.listen_port, fwd.connect_host,
789 fwd.connect_port, options.gateway_ports) < 0) {
790 logit("Port forwarding failed.");
794 if (channel_request_remote_forwarding(fwd.listen_host,
795 fwd.listen_port, fwd.connect_host,
796 fwd.connect_port) < 0) {
797 logit("Port forwarding failed.");
802 logit("Forwarding port.");
806 signal(SIGINT, handler);
810 if (fwd.listen_host != NULL)
811 xfree(fwd.listen_host);
812 if (fwd.connect_host != NULL)
813 xfree(fwd.connect_host);
816 /* process the characters one by one */
818 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
830 for (i = 0; i < (u_int)len; i++) {
831 /* Get one character at a time. */
834 if (escape_pending) {
835 /* We have previously seen an escape character. */
836 /* Clear the flag now. */
839 /* Process the escaped character. */
842 /* Terminate the connection. */
843 snprintf(string, sizeof string, "%c.\r\n", escape_char);
844 buffer_append(berr, string, strlen(string));
850 /* Suspend the program. */
851 /* Print a message to that effect to the user. */
852 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
853 buffer_append(berr, string, strlen(string));
855 /* Restore terminal modes and suspend. */
856 client_suspend_self(bin, bout, berr);
858 /* We have been continued. */
863 snprintf(string, sizeof string,
864 "%cB\r\n", escape_char);
865 buffer_append(berr, string,
867 channel_request_start(session_ident,
869 packet_put_int(1000);
876 if (datafellows & SSH_BUG_NOREKEY)
877 logit("Server does not support re-keying");
885 * Detach the program (continue to serve connections,
886 * but put in background and no more new connections).
888 /* Restore tty modes. */
891 /* Stop listening for new connections. */
892 channel_stop_listening();
894 snprintf(string, sizeof string,
895 "%c& [backgrounded]\n", escape_char);
896 buffer_append(berr, string, strlen(string));
898 /* Fork into background. */
901 error("fork: %.100s", strerror(errno));
904 if (pid != 0) { /* This is the parent. */
905 /* The parent just exits. */
908 /* The child continues serving connections. */
910 buffer_append(bin, "\004", 1);
911 /* fake EOF on stdin */
913 } else if (!stdin_eof) {
915 * Sending SSH_CMSG_EOF alone does not always appear
916 * to be enough. So we try to send an EOF character
919 packet_start(SSH_CMSG_STDIN_DATA);
920 packet_put_string("\004", 1);
924 if (buffer_len(bin) == 0) {
925 packet_start(SSH_CMSG_EOF);
932 snprintf(string, sizeof string,
934 Supported escape sequences:\r\n\
935 %c. - terminate connection\r\n\
936 %cB - send a BREAK to the remote system\r\n\
937 %cC - open a command line\r\n\
938 %cR - Request rekey (SSH protocol 2 only)\r\n\
939 %c^Z - suspend ssh\r\n\
940 %c# - list forwarded connections\r\n\
941 %c& - background ssh (when waiting for connections to terminate)\r\n\
942 %c? - this message\r\n\
943 %c%c - send the escape character by typing it twice\r\n\
944 (Note that escapes are only recognized immediately after newline.)\r\n",
945 escape_char, escape_char, escape_char, escape_char,
946 escape_char, escape_char, escape_char, escape_char,
947 escape_char, escape_char, escape_char);
948 buffer_append(berr, string, strlen(string));
952 snprintf(string, sizeof string, "%c#\r\n", escape_char);
953 buffer_append(berr, string, strlen(string));
954 s = channel_open_message();
955 buffer_append(berr, s, strlen(s));
964 if (ch != escape_char) {
965 buffer_put_char(bin, escape_char);
968 /* Escaped characters fall through here */
973 * The previous character was not an escape char. Check if this
976 if (last_was_cr && ch == escape_char) {
977 /* It is. Set the flag and continue to next character. */
984 * Normal character. Record whether it was a newline,
985 * and append it to the buffer.
987 last_was_cr = (ch == '\r' || ch == '\n');
988 buffer_put_char(bin, ch);
995 client_process_input(fd_set *readset)
1000 /* Read input from stdin. */
1001 if (FD_ISSET(fileno(stdin), readset)) {
1002 /* Read as much as possible. */
1003 len = read(fileno(stdin), buf, sizeof(buf));
1004 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1005 return; /* we'll try again later */
1008 * Received EOF or error. They are treated
1009 * similarly, except that an error message is printed
1010 * if it was an error condition.
1013 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1014 buffer_append(&stderr_buffer, buf, strlen(buf));
1016 /* Mark that we have seen EOF. */
1019 * Send an EOF message to the server unless there is
1020 * data in the buffer. If there is data in the
1021 * buffer, no message will be sent now. Code
1022 * elsewhere will send the EOF when the buffer
1023 * becomes empty if stdin_eof is set.
1025 if (buffer_len(&stdin_buffer) == 0) {
1026 packet_start(SSH_CMSG_EOF);
1029 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1031 * Normal successful read, and no escape character.
1032 * Just append the data to buffer.
1034 buffer_append(&stdin_buffer, buf, len);
1037 * Normal, successful read. But we have an escape character
1038 * and have to process the characters one by one.
1040 if (process_escapes(&stdin_buffer, &stdout_buffer,
1041 &stderr_buffer, buf, len) == -1)
1048 client_process_output(fd_set *writeset)
1053 /* Write buffered output to stdout. */
1054 if (FD_ISSET(fileno(stdout), writeset)) {
1055 /* Write as much data as possible. */
1056 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1057 buffer_len(&stdout_buffer));
1059 if (errno == EINTR || errno == EAGAIN)
1063 * An error or EOF was encountered. Put an
1064 * error message to stderr buffer.
1066 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1067 buffer_append(&stderr_buffer, buf, strlen(buf));
1072 /* Consume printed data from the buffer. */
1073 buffer_consume(&stdout_buffer, len);
1074 stdout_bytes += len;
1076 /* Write buffered output to stderr. */
1077 if (FD_ISSET(fileno(stderr), writeset)) {
1078 /* Write as much data as possible. */
1079 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1080 buffer_len(&stderr_buffer));
1082 if (errno == EINTR || errno == EAGAIN)
1085 /* EOF or error, but can't even print error message. */
1090 /* Consume printed characters from the buffer. */
1091 buffer_consume(&stderr_buffer, len);
1092 stderr_bytes += len;
1097 * Get packets from the connection input buffer, and process them as long as
1098 * there are packets available.
1100 * Any unknown packets received during the actual
1101 * session cause the session to terminate. This is
1102 * intended to make debugging easier since no
1103 * confirmations are sent. Any compatible protocol
1104 * extensions must be negotiated during the
1105 * preparatory phase.
1109 client_process_buffered_input_packets(void)
1111 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1114 /* scan buf[] for '~' before sending data to the peer */
1117 simple_escape_filter(Channel *c, char *buf, int len)
1119 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1122 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1126 client_channel_closed(int id, void *arg)
1128 channel_cancel_cleanup(id);
1134 * Implements the interactive session with the server. This is called after
1135 * the user has been authenticated, and a command has been started on the
1136 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1137 * used as an escape character for terminating or suspending the session.
1141 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1143 fd_set *readset = NULL, *writeset = NULL;
1144 double start_time, total_time;
1145 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1149 debug("Entering interactive session.");
1151 start_time = get_current_time();
1153 /* Initialize variables. */
1158 buffer_high = 64 * 1024;
1159 connection_in = packet_get_connection_in();
1160 connection_out = packet_get_connection_out();
1161 max_fd = MAX(connection_in, connection_out);
1162 if (muxserver_sock != -1)
1163 max_fd = MAX(max_fd, muxserver_sock);
1166 /* enable nonblocking unless tty */
1167 if (!isatty(fileno(stdin)))
1168 set_nonblock(fileno(stdin));
1169 if (!isatty(fileno(stdout)))
1170 set_nonblock(fileno(stdout));
1171 if (!isatty(fileno(stderr)))
1172 set_nonblock(fileno(stderr));
1173 max_fd = MAX(max_fd, fileno(stdin));
1174 max_fd = MAX(max_fd, fileno(stdout));
1175 max_fd = MAX(max_fd, fileno(stderr));
1181 escape_char = escape_char_arg;
1183 /* Initialize buffers. */
1184 buffer_init(&stdin_buffer);
1185 buffer_init(&stdout_buffer);
1186 buffer_init(&stderr_buffer);
1188 client_init_dispatch();
1191 * Set signal handlers, (e.g. to restore non-blocking mode)
1192 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1194 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1195 signal(SIGHUP, signal_handler);
1196 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1197 signal(SIGINT, signal_handler);
1198 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1199 signal(SIGQUIT, signal_handler);
1200 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1201 signal(SIGTERM, signal_handler);
1202 signal(SIGWINCH, window_change_handler);
1208 session_ident = ssh2_chan_id;
1209 if (escape_char != SSH_ESCAPECHAR_NONE)
1210 channel_register_filter(session_ident,
1211 simple_escape_filter, NULL);
1212 if (session_ident != -1)
1213 channel_register_cleanup(session_ident,
1214 client_channel_closed, 0);
1216 /* Check if we should immediately send eof on stdin. */
1217 client_check_initial_eof_on_stdin();
1220 /* Main loop of the client for the interactive session mode. */
1221 while (!quit_pending) {
1223 /* Process buffered packets sent by the server. */
1224 client_process_buffered_input_packets();
1226 if (compat20 && session_closed && !channel_still_open())
1229 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1232 debug("rekeying in progress");
1235 * Make packets of buffered stdin data, and buffer
1236 * them for sending to the server.
1239 client_make_packets_from_stdin_data();
1242 * Make packets from buffered channel data, and
1243 * enqueue them for sending to the server.
1245 if (packet_not_very_much_data_to_write())
1246 channel_output_poll();
1249 * Check if the window size has changed, and buffer a
1250 * message about it to the server if so.
1252 client_check_window_change();
1258 * Wait until we have something to do (something becomes
1259 * available on one of the descriptors).
1262 client_wait_until_can_do_something(&readset, &writeset,
1263 &max_fd2, &nalloc, rekeying);
1268 /* Do channel operations unless rekeying in progress. */
1270 channel_after_select(readset, writeset);
1271 if (need_rekeying || packet_need_rekeying()) {
1272 debug("need rekeying");
1274 kex_send_kexinit(xxx_kex);
1279 /* Buffer input from the connection. */
1280 client_process_net_input(readset);
1282 /* Accept control connections. */
1283 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1284 if (muxserver_accept_control())
1292 /* Buffer data from stdin */
1293 client_process_input(readset);
1295 * Process output to stdout and stderr. Output to
1296 * the connection is processed elsewhere (above).
1298 client_process_output(writeset);
1301 /* Send as much buffered packet data as possible to the sender. */
1302 if (FD_ISSET(connection_out, writeset))
1303 packet_write_poll();
1310 /* Terminate the session. */
1312 /* Stop watching for window change. */
1313 signal(SIGWINCH, SIG_DFL);
1320 /* restore blocking io */
1321 if (!isatty(fileno(stdin)))
1322 unset_nonblock(fileno(stdin));
1323 if (!isatty(fileno(stdout)))
1324 unset_nonblock(fileno(stdout));
1325 if (!isatty(fileno(stderr)))
1326 unset_nonblock(fileno(stderr));
1329 * If there was no shell or command requested, there will be no remote
1330 * exit status to be returned. In that case, clear error code if the
1331 * connection was deliberately terminated at this end.
1333 if (no_shell_flag && received_signal == SIGTERM) {
1334 received_signal = 0;
1338 if (received_signal)
1339 fatal("Killed by signal %d.", (int) received_signal);
1342 * In interactive mode (with pseudo tty) display a message indicating
1343 * that the connection has been closed.
1345 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1346 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1347 buffer_append(&stderr_buffer, buf, strlen(buf));
1350 /* Output any buffered data for stdout. */
1351 while (buffer_len(&stdout_buffer) > 0) {
1352 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1353 buffer_len(&stdout_buffer));
1355 error("Write failed flushing stdout buffer.");
1358 buffer_consume(&stdout_buffer, len);
1359 stdout_bytes += len;
1362 /* Output any buffered data for stderr. */
1363 while (buffer_len(&stderr_buffer) > 0) {
1364 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1365 buffer_len(&stderr_buffer));
1367 error("Write failed flushing stderr buffer.");
1370 buffer_consume(&stderr_buffer, len);
1371 stderr_bytes += len;
1374 /* Clear and free any buffers. */
1375 memset(buf, 0, sizeof(buf));
1376 buffer_free(&stdin_buffer);
1377 buffer_free(&stdout_buffer);
1378 buffer_free(&stderr_buffer);
1380 /* Report bytes transferred, and transfer rates. */
1381 total_time = get_current_time() - start_time;
1382 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1383 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1385 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1386 stdin_bytes / total_time, stdout_bytes / total_time,
1387 stderr_bytes / total_time);
1389 /* Return the exit status of the program. */
1390 debug("Exit status %d", exit_status);
1397 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1400 char *data = packet_get_string(&data_len);
1402 buffer_append(&stdout_buffer, data, data_len);
1403 memset(data, 0, data_len);
1407 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1410 char *data = packet_get_string(&data_len);
1412 buffer_append(&stderr_buffer, data, data_len);
1413 memset(data, 0, data_len);
1417 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1419 exit_status = packet_get_int();
1421 /* Acknowledge the exit. */
1422 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1425 * Must wait for packet to be sent since we are
1428 packet_write_wait();
1429 /* Flag that we want to exit. */
1433 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1436 int remote_id, sock;
1438 /* Read the remote channel number from the message. */
1439 remote_id = packet_get_int();
1443 * Get a connection to the local authentication agent (this may again
1446 sock = ssh_get_authentication_socket();
1449 * If we could not connect the agent, send an error message back to
1450 * the server. This should never happen unless the agent dies,
1451 * because authentication forwarding is only enabled if we have an
1455 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1456 -1, 0, 0, 0, "authentication agent connection", 1);
1457 c->remote_id = remote_id;
1461 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1462 packet_put_int(remote_id);
1464 /* Send a confirmation to the remote host. */
1465 debug("Forwarding authentication connection.");
1466 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1467 packet_put_int(remote_id);
1468 packet_put_int(c->self);
1474 client_request_forwarded_tcpip(const char *request_type, int rchan)
1477 char *listen_address, *originator_address;
1478 int listen_port, originator_port;
1480 /* Get rest of the packet */
1481 listen_address = packet_get_string(NULL);
1482 listen_port = packet_get_int();
1483 originator_address = packet_get_string(NULL);
1484 originator_port = packet_get_int();
1487 debug("client_request_forwarded_tcpip: listen %s port %d, "
1488 "originator %s port %d", listen_address, listen_port,
1489 originator_address, originator_port);
1491 c = channel_connect_by_listen_address(listen_port,
1492 "forwarded-tcpip", originator_address);
1494 xfree(originator_address);
1495 xfree(listen_address);
1500 client_request_x11(const char *request_type, int rchan)
1504 int originator_port;
1507 if (!options.forward_x11) {
1508 error("Warning: ssh server tried X11 forwarding.");
1509 error("Warning: this is probably a break-in attempt by a malicious server.");
1512 originator = packet_get_string(NULL);
1513 if (datafellows & SSH_BUG_X11FWD) {
1514 debug2("buggy server: x11 request w/o originator_port");
1515 originator_port = 0;
1517 originator_port = packet_get_int();
1520 /* XXX check permission */
1521 debug("client_request_x11: request from %s %d", originator,
1524 sock = x11_connect_display();
1527 c = channel_new("x11",
1528 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1529 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1535 client_request_agent(const char *request_type, int rchan)
1540 if (!options.forward_agent) {
1541 error("Warning: ssh server tried agent forwarding.");
1542 error("Warning: this is probably a break-in attempt by a malicious server.");
1545 sock = ssh_get_authentication_socket();
1548 c = channel_new("authentication agent connection",
1549 SSH_CHANNEL_OPEN, sock, sock, -1,
1550 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1551 "authentication agent connection", 1);
1557 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1562 if (tun_mode == SSH_TUNMODE_NO)
1566 error("Tunnel forwarding is not support for protocol 1");
1570 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1572 /* Open local tunnel device */
1573 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1574 error("Tunnel device open failed.");
1578 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1579 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1582 #if defined(SSH_TUN_FILTER)
1583 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1584 channel_register_filter(c->self, sys_tun_infilter,
1588 packet_start(SSH2_MSG_CHANNEL_OPEN);
1589 packet_put_cstring("tun@openssh.com");
1590 packet_put_int(c->self);
1591 packet_put_int(c->local_window_max);
1592 packet_put_int(c->local_maxpacket);
1593 packet_put_int(tun_mode);
1594 packet_put_int(remote_tun);
1600 /* XXXX move to generic input handler */
1602 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1607 u_int rmaxpack, rwindow, len;
1609 ctype = packet_get_string(&len);
1610 rchan = packet_get_int();
1611 rwindow = packet_get_int();
1612 rmaxpack = packet_get_int();
1614 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1615 ctype, rchan, rwindow, rmaxpack);
1617 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1618 c = client_request_forwarded_tcpip(ctype, rchan);
1619 } else if (strcmp(ctype, "x11") == 0) {
1620 c = client_request_x11(ctype, rchan);
1621 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1622 c = client_request_agent(ctype, rchan);
1624 /* XXX duplicate : */
1626 debug("confirm %s", ctype);
1627 c->remote_id = rchan;
1628 c->remote_window = rwindow;
1629 c->remote_maxpacket = rmaxpack;
1630 if (c->type != SSH_CHANNEL_CONNECTING) {
1631 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1632 packet_put_int(c->remote_id);
1633 packet_put_int(c->self);
1634 packet_put_int(c->local_window);
1635 packet_put_int(c->local_maxpacket);
1639 debug("failure %s", ctype);
1640 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1641 packet_put_int(rchan);
1642 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1643 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1644 packet_put_cstring("open failed");
1645 packet_put_cstring("");
1652 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1655 int exitval, id, reply, success = 0;
1658 id = packet_get_int();
1659 rtype = packet_get_string(NULL);
1660 reply = packet_get_char();
1662 debug("client_input_channel_req: channel %d rtype %s reply %d",
1666 error("client_input_channel_req: request for channel -1");
1667 } else if ((c = channel_lookup(id)) == NULL) {
1668 error("client_input_channel_req: channel %d: unknown channel", id);
1669 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1672 } else if (strcmp(rtype, "exit-status") == 0) {
1673 exitval = packet_get_int();
1674 if (id == session_ident) {
1676 exit_status = exitval;
1677 } else if (c->ctl_fd == -1) {
1678 error("client_input_channel_req: unexpected channel %d",
1681 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1687 packet_start(success ?
1688 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1695 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1701 rtype = packet_get_string(NULL);
1702 want_reply = packet_get_char();
1703 debug("client_input_global_request: rtype %s want_reply %d",
1706 packet_start(success ?
1707 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1709 packet_write_wait();
1715 client_session2_setup(int id, int want_tty, int want_subsystem,
1716 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1721 debug2("%s: id %d", __func__, id);
1723 if ((c = channel_lookup(id)) == NULL)
1724 fatal("client_session2_setup: channel %d: unknown channel", id);
1730 /* Store window size in the packet. */
1731 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1732 memset(&ws, 0, sizeof(ws));
1734 channel_request_start(id, "pty-req", 1);
1735 client_expect_confirm(id, "PTY allocation", 0);
1736 packet_put_cstring(term != NULL ? term : "");
1737 packet_put_int((u_int)ws.ws_col);
1738 packet_put_int((u_int)ws.ws_row);
1739 packet_put_int((u_int)ws.ws_xpixel);
1740 packet_put_int((u_int)ws.ws_ypixel);
1741 tio = get_saved_tio();
1742 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1744 /* XXX wait for reply */
1748 /* Transfer any environment variables from client to server */
1749 if (options.num_send_env != 0 && env != NULL) {
1753 debug("Sending environment.");
1754 for (i = 0; env[i] != NULL; i++) {
1756 name = xstrdup(env[i]);
1757 if ((val = strchr(name, '=')) == NULL) {
1764 for (j = 0; j < options.num_send_env; j++) {
1765 if (match_pattern(name, options.send_env[j])) {
1771 debug3("Ignored env %s", name);
1776 debug("Sending env %s = %s", name, val);
1777 channel_request_start(id, "env", 0);
1778 packet_put_cstring(name);
1779 packet_put_cstring(val);
1785 len = buffer_len(cmd);
1789 if (want_subsystem) {
1790 debug("Sending subsystem: %.*s",
1791 len, (u_char*)buffer_ptr(cmd));
1792 channel_request_start(id, "subsystem", 1);
1793 client_expect_confirm(id, "subsystem", 1);
1795 debug("Sending command: %.*s",
1796 len, (u_char*)buffer_ptr(cmd));
1797 channel_request_start(id, "exec", 1);
1798 client_expect_confirm(id, "exec", 1);
1800 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1803 channel_request_start(id, "shell", 1);
1804 client_expect_confirm(id, "shell", 1);
1810 client_init_dispatch_20(void)
1812 dispatch_init(&dispatch_protocol_error);
1814 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1815 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1816 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1817 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1818 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1819 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1820 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1821 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1822 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1823 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
1824 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1825 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1828 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1830 /* global request reply messages */
1831 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1832 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1835 client_init_dispatch_13(void)
1837 dispatch_init(NULL);
1838 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1839 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1840 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1841 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1842 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1843 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1844 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1845 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1846 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1848 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1849 &client_input_agent_open : &deny_input_open);
1850 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1851 &x11_input_open : &deny_input_open);
1854 client_init_dispatch_15(void)
1856 client_init_dispatch_13();
1857 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1858 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1861 client_init_dispatch(void)
1864 client_init_dispatch_20();
1866 client_init_dispatch_13();
1868 client_init_dispatch_15();
1871 /* client specific fatal cleanup */
1876 leave_non_blocking();
1877 if (options.control_path != NULL && muxserver_sock != -1)
1878 unlink(options.control_path);