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) < 0) {
854 logit("Port forwarding failed.");
858 if (channel_request_remote_forwarding(fwd.listen_host,
859 fwd.listen_port, fwd.connect_host,
860 fwd.connect_port) < 0) {
861 logit("Port forwarding failed.");
866 logit("Forwarding port.");
870 signal(SIGINT, handler);
874 if (fwd.listen_host != NULL)
875 xfree(fwd.listen_host);
876 if (fwd.connect_host != NULL)
877 xfree(fwd.connect_host);
881 * Process the characters one by one, call with c==NULL for proto1 case.
884 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
893 int *escape_pendingp, escape_char;
894 struct escape_filter_ctx *efc;
897 escape_pendingp = &escape_pending1;
898 escape_char = escape_char1;
900 if (c->filter_ctx == NULL)
902 efc = (struct escape_filter_ctx *)c->filter_ctx;
903 escape_pendingp = &efc->escape_pending;
904 escape_char = efc->escape_char;
910 for (i = 0; i < (u_int)len; i++) {
911 /* Get one character at a time. */
914 if (*escape_pendingp) {
915 /* We have previously seen an escape character. */
916 /* Clear the flag now. */
917 *escape_pendingp = 0;
919 /* Process the escaped character. */
922 /* Terminate the connection. */
923 snprintf(string, sizeof string, "%c.\r\n",
925 buffer_append(berr, string, strlen(string));
927 if (c && c->ctl_fd != -1) {
929 chan_write_failed(c);
936 /* XXX support this for mux clients */
937 if (c && c->ctl_fd != -1) {
939 snprintf(string, sizeof string,
940 "%c%c escape not available to "
941 "multiplexed sessions\r\n",
943 buffer_append(berr, string,
947 /* Suspend the program. Inform the user */
948 snprintf(string, sizeof string,
949 "%c^Z [suspend ssh]\r\n", escape_char);
950 buffer_append(berr, string, strlen(string));
952 /* Restore terminal modes and suspend. */
953 client_suspend_self(bin, bout, berr);
955 /* We have been continued. */
960 snprintf(string, sizeof string,
961 "%cB\r\n", escape_char);
962 buffer_append(berr, string,
964 channel_request_start(session_ident,
966 packet_put_int(1000);
973 if (datafellows & SSH_BUG_NOREKEY)
974 logit("Server does not "
975 "support re-keying");
982 if (c && c->ctl_fd != -1)
985 * Detach the program (continue to serve
986 * connections, but put in background and no
987 * more new connections).
989 /* Restore tty modes. */
992 /* Stop listening for new connections. */
993 channel_stop_listening();
995 snprintf(string, sizeof string,
996 "%c& [backgrounded]\n", escape_char);
997 buffer_append(berr, string, strlen(string));
999 /* Fork into background. */
1002 error("fork: %.100s", strerror(errno));
1005 if (pid != 0) { /* This is the parent. */
1006 /* The parent just exits. */
1009 /* The child continues serving connections. */
1011 buffer_append(bin, "\004", 1);
1012 /* fake EOF on stdin */
1014 } else if (!stdin_eof) {
1016 * Sending SSH_CMSG_EOF alone does not
1017 * always appear to be enough. So we
1018 * try to send an EOF character first.
1020 packet_start(SSH_CMSG_STDIN_DATA);
1021 packet_put_string("\004", 1);
1025 if (buffer_len(bin) == 0) {
1026 packet_start(SSH_CMSG_EOF);
1033 if (c && c->ctl_fd != -1) {
1034 snprintf(string, sizeof string,
1036 Supported escape sequences:\r\n\
1037 %c. - terminate session\r\n\
1038 %cB - send a BREAK to the remote system\r\n\
1039 %cC - open a command line\r\n\
1040 %cR - Request rekey (SSH protocol 2 only)\r\n\
1041 %c# - list forwarded connections\r\n\
1042 %c? - this message\r\n\
1043 %c%c - send the escape character by typing it twice\r\n\
1044 (Note that escapes are only recognized immediately after newline.)\r\n",
1045 escape_char, escape_char,
1046 escape_char, escape_char,
1047 escape_char, escape_char,
1048 escape_char, escape_char,
1051 snprintf(string, sizeof string,
1053 Supported escape sequences:\r\n\
1054 %c. - terminate connection (and any multiplexed sessions)\r\n\
1055 %cB - send a BREAK to the remote system\r\n\
1056 %cC - open a command line\r\n\
1057 %cR - Request rekey (SSH protocol 2 only)\r\n\
1058 %c^Z - suspend ssh\r\n\
1059 %c# - list forwarded connections\r\n\
1060 %c& - background ssh (when waiting for connections to terminate)\r\n\
1061 %c? - this message\r\n\
1062 %c%c - send the escape character by typing it twice\r\n\
1063 (Note that escapes are only recognized immediately after newline.)\r\n",
1064 escape_char, escape_char,
1065 escape_char, escape_char,
1066 escape_char, escape_char,
1067 escape_char, escape_char,
1068 escape_char, escape_char,
1071 buffer_append(berr, string, strlen(string));
1075 snprintf(string, sizeof string, "%c#\r\n",
1077 buffer_append(berr, string, strlen(string));
1078 s = channel_open_message();
1079 buffer_append(berr, s, strlen(s));
1088 if (ch != escape_char) {
1089 buffer_put_char(bin, escape_char);
1092 /* Escaped characters fall through here */
1097 * The previous character was not an escape char.
1098 * Check if this is an escape.
1100 if (last_was_cr && ch == escape_char) {
1102 * It is. Set the flag and continue to
1105 *escape_pendingp = 1;
1111 * Normal character. Record whether it was a newline,
1112 * and append it to the buffer.
1114 last_was_cr = (ch == '\r' || ch == '\n');
1115 buffer_put_char(bin, ch);
1122 client_process_input(fd_set *readset)
1127 /* Read input from stdin. */
1128 if (FD_ISSET(fileno(stdin), readset)) {
1129 /* Read as much as possible. */
1130 len = read(fileno(stdin), buf, sizeof(buf));
1132 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1133 return; /* we'll try again later */
1136 * Received EOF or error. They are treated
1137 * similarly, except that an error message is printed
1138 * if it was an error condition.
1141 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1143 buffer_append(&stderr_buffer, buf, strlen(buf));
1145 /* Mark that we have seen EOF. */
1148 * Send an EOF message to the server unless there is
1149 * data in the buffer. If there is data in the
1150 * buffer, no message will be sent now. Code
1151 * elsewhere will send the EOF when the buffer
1152 * becomes empty if stdin_eof is set.
1154 if (buffer_len(&stdin_buffer) == 0) {
1155 packet_start(SSH_CMSG_EOF);
1158 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1160 * Normal successful read, and no escape character.
1161 * Just append the data to buffer.
1163 buffer_append(&stdin_buffer, buf, len);
1166 * Normal, successful read. But we have an escape
1167 * character and have to process the characters one
1170 if (process_escapes(NULL, &stdin_buffer,
1171 &stdout_buffer, &stderr_buffer, buf, len) == -1)
1178 client_process_output(fd_set *writeset)
1183 /* Write buffered output to stdout. */
1184 if (FD_ISSET(fileno(stdout), writeset)) {
1185 /* Write as much data as possible. */
1186 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1187 buffer_len(&stdout_buffer));
1189 if (errno == EINTR || errno == EAGAIN ||
1190 errno == EWOULDBLOCK)
1194 * An error or EOF was encountered. Put an
1195 * error message to stderr buffer.
1197 snprintf(buf, sizeof buf,
1198 "write stdout: %.50s\r\n", strerror(errno));
1199 buffer_append(&stderr_buffer, buf, strlen(buf));
1204 /* Consume printed data from the buffer. */
1205 buffer_consume(&stdout_buffer, len);
1207 /* Write buffered output to stderr. */
1208 if (FD_ISSET(fileno(stderr), writeset)) {
1209 /* Write as much data as possible. */
1210 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1211 buffer_len(&stderr_buffer));
1213 if (errno == EINTR || errno == EAGAIN ||
1214 errno == EWOULDBLOCK)
1218 * EOF or error, but can't even print
1225 /* Consume printed characters from the buffer. */
1226 buffer_consume(&stderr_buffer, len);
1231 * Get packets from the connection input buffer, and process them as long as
1232 * there are packets available.
1234 * Any unknown packets received during the actual
1235 * session cause the session to terminate. This is
1236 * intended to make debugging easier since no
1237 * confirmations are sent. Any compatible protocol
1238 * extensions must be negotiated during the
1239 * preparatory phase.
1243 client_process_buffered_input_packets(void)
1245 dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1246 compat20 ? xxx_kex : NULL);
1249 /* scan buf[] for '~' before sending data to the peer */
1251 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1253 client_new_escape_filter_ctx(int escape_char)
1255 struct escape_filter_ctx *ret;
1257 ret = xmalloc(sizeof(*ret));
1258 ret->escape_pending = 0;
1259 ret->escape_char = escape_char;
1263 /* Free the escape filter context on channel free */
1265 client_filter_cleanup(int cid, void *ctx)
1271 client_simple_escape_filter(Channel *c, char *buf, int len)
1273 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1276 return process_escapes(c, &c->input, &c->output, &c->extended,
1281 client_channel_closed(int id, void *arg)
1283 channel_cancel_cleanup(id);
1289 * Implements the interactive session with the server. This is called after
1290 * the user has been authenticated, and a command has been started on the
1291 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1292 * used as an escape character for terminating or suspending the session.
1296 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1298 fd_set *readset = NULL, *writeset = NULL;
1299 double start_time, total_time;
1300 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1301 u_int64_t ibytes, obytes;
1305 debug("Entering interactive session.");
1307 start_time = get_current_time();
1309 /* Initialize variables. */
1310 escape_pending1 = 0;
1314 buffer_high = 64 * 1024;
1315 connection_in = packet_get_connection_in();
1316 connection_out = packet_get_connection_out();
1317 max_fd = MAX(connection_in, connection_out);
1318 if (muxserver_sock != -1)
1319 max_fd = MAX(max_fd, muxserver_sock);
1322 /* enable nonblocking unless tty */
1323 if (!isatty(fileno(stdin)))
1324 set_nonblock(fileno(stdin));
1325 if (!isatty(fileno(stdout)))
1326 set_nonblock(fileno(stdout));
1327 if (!isatty(fileno(stderr)))
1328 set_nonblock(fileno(stderr));
1329 max_fd = MAX(max_fd, fileno(stdin));
1330 max_fd = MAX(max_fd, fileno(stdout));
1331 max_fd = MAX(max_fd, fileno(stderr));
1334 escape_char1 = escape_char_arg;
1336 /* Initialize buffers. */
1337 buffer_init(&stdin_buffer);
1338 buffer_init(&stdout_buffer);
1339 buffer_init(&stderr_buffer);
1341 client_init_dispatch();
1344 * Set signal handlers, (e.g. to restore non-blocking mode)
1345 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1347 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1348 signal(SIGHUP, signal_handler);
1349 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1350 signal(SIGINT, signal_handler);
1351 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1352 signal(SIGQUIT, signal_handler);
1353 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1354 signal(SIGTERM, signal_handler);
1355 signal(SIGWINCH, window_change_handler);
1361 session_ident = ssh2_chan_id;
1362 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1363 channel_register_filter(session_ident,
1364 client_simple_escape_filter, NULL,
1365 client_filter_cleanup,
1366 client_new_escape_filter_ctx(escape_char_arg));
1367 if (session_ident != -1)
1368 channel_register_cleanup(session_ident,
1369 client_channel_closed, 0);
1371 /* Check if we should immediately send eof on stdin. */
1372 client_check_initial_eof_on_stdin();
1375 /* Main loop of the client for the interactive session mode. */
1376 while (!quit_pending) {
1378 /* Process buffered packets sent by the server. */
1379 client_process_buffered_input_packets();
1381 if (compat20 && session_closed && !channel_still_open())
1384 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1387 debug("rekeying in progress");
1390 * Make packets of buffered stdin data, and buffer
1391 * them for sending to the server.
1394 client_make_packets_from_stdin_data();
1397 * Make packets from buffered channel data, and
1398 * enqueue them for sending to the server.
1400 if (packet_not_very_much_data_to_write())
1401 channel_output_poll();
1404 * Check if the window size has changed, and buffer a
1405 * message about it to the server if so.
1407 client_check_window_change();
1413 * Wait until we have something to do (something becomes
1414 * available on one of the descriptors).
1417 client_wait_until_can_do_something(&readset, &writeset,
1418 &max_fd2, &nalloc, rekeying);
1423 /* Do channel operations unless rekeying in progress. */
1425 channel_after_select(readset, writeset);
1426 if (need_rekeying || packet_need_rekeying()) {
1427 debug("need rekeying");
1429 kex_send_kexinit(xxx_kex);
1434 /* Buffer input from the connection. */
1435 client_process_net_input(readset);
1437 /* Accept control connections. */
1438 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1439 if (muxserver_accept_control())
1447 /* Buffer data from stdin */
1448 client_process_input(readset);
1450 * Process output to stdout and stderr. Output to
1451 * the connection is processed elsewhere (above).
1453 client_process_output(writeset);
1457 * Send as much buffered packet data as possible to the
1460 if (FD_ISSET(connection_out, writeset))
1461 packet_write_poll();
1468 /* Terminate the session. */
1470 /* Stop watching for window change. */
1471 signal(SIGWINCH, SIG_DFL);
1478 /* restore blocking io */
1479 if (!isatty(fileno(stdin)))
1480 unset_nonblock(fileno(stdin));
1481 if (!isatty(fileno(stdout)))
1482 unset_nonblock(fileno(stdout));
1483 if (!isatty(fileno(stderr)))
1484 unset_nonblock(fileno(stderr));
1487 * If there was no shell or command requested, there will be no remote
1488 * exit status to be returned. In that case, clear error code if the
1489 * connection was deliberately terminated at this end.
1491 if (no_shell_flag && received_signal == SIGTERM) {
1492 received_signal = 0;
1496 if (received_signal)
1497 fatal("Killed by signal %d.", (int) received_signal);
1500 * In interactive mode (with pseudo tty) display a message indicating
1501 * that the connection has been closed.
1503 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1504 snprintf(buf, sizeof buf,
1505 "Connection to %.64s closed.\r\n", host);
1506 buffer_append(&stderr_buffer, buf, strlen(buf));
1509 /* Output any buffered data for stdout. */
1510 while (buffer_len(&stdout_buffer) > 0) {
1511 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1512 buffer_len(&stdout_buffer));
1514 error("Write failed flushing stdout buffer.");
1517 buffer_consume(&stdout_buffer, len);
1520 /* Output any buffered data for stderr. */
1521 while (buffer_len(&stderr_buffer) > 0) {
1522 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1523 buffer_len(&stderr_buffer));
1525 error("Write failed flushing stderr buffer.");
1528 buffer_consume(&stderr_buffer, len);
1531 /* Clear and free any buffers. */
1532 memset(buf, 0, sizeof(buf));
1533 buffer_free(&stdin_buffer);
1534 buffer_free(&stdout_buffer);
1535 buffer_free(&stderr_buffer);
1537 /* Report bytes transferred, and transfer rates. */
1538 total_time = get_current_time() - start_time;
1539 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1540 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1541 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1542 obytes, ibytes, total_time);
1544 verbose("Bytes per second: sent %.1f, received %.1f",
1545 obytes / total_time, ibytes / total_time);
1546 /* Return the exit status of the program. */
1547 debug("Exit status %d", exit_status);
1554 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1557 char *data = packet_get_string(&data_len);
1559 buffer_append(&stdout_buffer, data, data_len);
1560 memset(data, 0, data_len);
1564 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1567 char *data = packet_get_string(&data_len);
1569 buffer_append(&stderr_buffer, data, data_len);
1570 memset(data, 0, data_len);
1574 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1576 exit_status = packet_get_int();
1578 /* Acknowledge the exit. */
1579 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1582 * Must wait for packet to be sent since we are
1585 packet_write_wait();
1586 /* Flag that we want to exit. */
1590 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1593 int remote_id, sock;
1595 /* Read the remote channel number from the message. */
1596 remote_id = packet_get_int();
1600 * Get a connection to the local authentication agent (this may again
1603 sock = ssh_get_authentication_socket();
1606 * If we could not connect the agent, send an error message back to
1607 * the server. This should never happen unless the agent dies,
1608 * because authentication forwarding is only enabled if we have an
1612 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1613 -1, 0, 0, 0, "authentication agent connection", 1);
1614 c->remote_id = remote_id;
1618 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1619 packet_put_int(remote_id);
1621 /* Send a confirmation to the remote host. */
1622 debug("Forwarding authentication connection.");
1623 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1624 packet_put_int(remote_id);
1625 packet_put_int(c->self);
1631 client_request_forwarded_tcpip(const char *request_type, int rchan)
1634 char *listen_address, *originator_address;
1635 int listen_port, originator_port;
1637 /* Get rest of the packet */
1638 listen_address = packet_get_string(NULL);
1639 listen_port = packet_get_int();
1640 originator_address = packet_get_string(NULL);
1641 originator_port = packet_get_int();
1644 debug("client_request_forwarded_tcpip: listen %s port %d, "
1645 "originator %s port %d", listen_address, listen_port,
1646 originator_address, originator_port);
1648 c = channel_connect_by_listen_address(listen_port,
1649 "forwarded-tcpip", originator_address);
1651 xfree(originator_address);
1652 xfree(listen_address);
1657 client_request_x11(const char *request_type, int rchan)
1661 int originator_port;
1664 if (!options.forward_x11) {
1665 error("Warning: ssh server tried X11 forwarding.");
1666 error("Warning: this is probably a break-in attempt by a "
1667 "malicious server.");
1670 originator = packet_get_string(NULL);
1671 if (datafellows & SSH_BUG_X11FWD) {
1672 debug2("buggy server: x11 request w/o originator_port");
1673 originator_port = 0;
1675 originator_port = packet_get_int();
1678 /* XXX check permission */
1679 debug("client_request_x11: request from %s %d", originator,
1682 sock = x11_connect_display();
1685 c = channel_new("x11",
1686 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1687 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1693 client_request_agent(const char *request_type, int rchan)
1698 if (!options.forward_agent) {
1699 error("Warning: ssh server tried agent forwarding.");
1700 error("Warning: this is probably a break-in attempt by a "
1701 "malicious server.");
1704 sock = ssh_get_authentication_socket();
1707 c = channel_new("authentication agent connection",
1708 SSH_CHANNEL_OPEN, sock, sock, -1,
1709 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1710 "authentication agent connection", 1);
1716 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1721 if (tun_mode == SSH_TUNMODE_NO)
1725 error("Tunnel forwarding is not support for protocol 1");
1729 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1731 /* Open local tunnel device */
1732 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1733 error("Tunnel device open failed.");
1737 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1738 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1741 #if defined(SSH_TUN_FILTER)
1742 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1743 channel_register_filter(c->self, sys_tun_infilter,
1744 sys_tun_outfilter, NULL, NULL);
1747 packet_start(SSH2_MSG_CHANNEL_OPEN);
1748 packet_put_cstring("tun@openssh.com");
1749 packet_put_int(c->self);
1750 packet_put_int(c->local_window_max);
1751 packet_put_int(c->local_maxpacket);
1752 packet_put_int(tun_mode);
1753 packet_put_int(remote_tun);
1759 /* XXXX move to generic input handler */
1761 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1766 u_int rmaxpack, rwindow, len;
1768 ctype = packet_get_string(&len);
1769 rchan = packet_get_int();
1770 rwindow = packet_get_int();
1771 rmaxpack = packet_get_int();
1773 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1774 ctype, rchan, rwindow, rmaxpack);
1776 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1777 c = client_request_forwarded_tcpip(ctype, rchan);
1778 } else if (strcmp(ctype, "x11") == 0) {
1779 c = client_request_x11(ctype, rchan);
1780 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1781 c = client_request_agent(ctype, rchan);
1783 /* XXX duplicate : */
1785 debug("confirm %s", ctype);
1786 c->remote_id = rchan;
1787 c->remote_window = rwindow;
1788 c->remote_maxpacket = rmaxpack;
1789 if (c->type != SSH_CHANNEL_CONNECTING) {
1790 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1791 packet_put_int(c->remote_id);
1792 packet_put_int(c->self);
1793 packet_put_int(c->local_window);
1794 packet_put_int(c->local_maxpacket);
1798 debug("failure %s", ctype);
1799 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1800 packet_put_int(rchan);
1801 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1802 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1803 packet_put_cstring("open failed");
1804 packet_put_cstring("");
1811 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1814 int exitval, id, reply, success = 0;
1817 id = packet_get_int();
1818 rtype = packet_get_string(NULL);
1819 reply = packet_get_char();
1821 debug("client_input_channel_req: channel %d rtype %s reply %d",
1825 error("client_input_channel_req: request for channel -1");
1826 } else if ((c = channel_lookup(id)) == NULL) {
1827 error("client_input_channel_req: channel %d: "
1828 "unknown channel", id);
1829 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1832 } else if (strcmp(rtype, "exit-status") == 0) {
1833 exitval = packet_get_int();
1834 if (id == session_ident) {
1836 exit_status = exitval;
1837 } else if (c->ctl_fd == -1) {
1838 error("client_input_channel_req: unexpected channel %d",
1841 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1847 packet_start(success ?
1848 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1855 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1861 rtype = packet_get_string(NULL);
1862 want_reply = packet_get_char();
1863 debug("client_input_global_request: rtype %s want_reply %d",
1866 packet_start(success ?
1867 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1869 packet_write_wait();
1875 client_session2_setup(int id, int want_tty, int want_subsystem,
1876 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1881 debug2("%s: id %d", __func__, id);
1883 if ((c = channel_lookup(id)) == NULL)
1884 fatal("client_session2_setup: channel %d: unknown channel", id);
1889 /* Store window size in the packet. */
1890 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1891 memset(&ws, 0, sizeof(ws));
1893 channel_request_start(id, "pty-req", 1);
1894 client_expect_confirm(id, "PTY allocation", 0);
1895 packet_put_cstring(term != NULL ? term : "");
1896 packet_put_int((u_int)ws.ws_col);
1897 packet_put_int((u_int)ws.ws_row);
1898 packet_put_int((u_int)ws.ws_xpixel);
1899 packet_put_int((u_int)ws.ws_ypixel);
1901 tiop = get_saved_tio();
1902 tty_make_modes(-1, tiop);
1904 /* XXX wait for reply */
1908 /* Transfer any environment variables from client to server */
1909 if (options.num_send_env != 0 && env != NULL) {
1913 debug("Sending environment.");
1914 for (i = 0; env[i] != NULL; i++) {
1916 name = xstrdup(env[i]);
1917 if ((val = strchr(name, '=')) == NULL) {
1924 for (j = 0; j < options.num_send_env; j++) {
1925 if (match_pattern(name, options.send_env[j])) {
1931 debug3("Ignored env %s", name);
1936 debug("Sending env %s = %s", name, val);
1937 channel_request_start(id, "env", 0);
1938 packet_put_cstring(name);
1939 packet_put_cstring(val);
1945 len = buffer_len(cmd);
1949 if (want_subsystem) {
1950 debug("Sending subsystem: %.*s",
1951 len, (u_char*)buffer_ptr(cmd));
1952 channel_request_start(id, "subsystem", 1);
1953 client_expect_confirm(id, "subsystem", 1);
1955 debug("Sending command: %.*s",
1956 len, (u_char*)buffer_ptr(cmd));
1957 channel_request_start(id, "exec", 1);
1958 client_expect_confirm(id, "exec", 1);
1960 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1963 channel_request_start(id, "shell", 1);
1964 client_expect_confirm(id, "shell", 1);
1970 client_init_dispatch_20(void)
1972 dispatch_init(&dispatch_protocol_error);
1974 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1975 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1976 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1977 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1978 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1979 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1980 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1981 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1982 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1983 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
1984 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1985 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1988 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1990 /* global request reply messages */
1991 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1992 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1996 client_init_dispatch_13(void)
1998 dispatch_init(NULL);
1999 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2000 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2001 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2002 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2003 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2004 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2005 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2006 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2007 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2009 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2010 &client_input_agent_open : &deny_input_open);
2011 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2012 &x11_input_open : &deny_input_open);
2016 client_init_dispatch_15(void)
2018 client_init_dispatch_13();
2019 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2020 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2024 client_init_dispatch(void)
2027 client_init_dispatch_20();
2029 client_init_dispatch_13();
2031 client_init_dispatch_15();
2034 /* client specific fatal cleanup */
2039 leave_non_blocking();
2040 if (options.control_path != NULL && muxserver_sock != -1)
2041 unlink(options.control_path);