1 /* $OpenBSD: clientloop.c,v 1.213 2009/07/05 19:28:33 stevesk Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * The main loop for the interactive session (client side).
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
15 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 * SSH2 support added by Markus Friedl.
39 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
50 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
64 #include <sys/types.h>
65 #include <sys/ioctl.h>
66 #include <sys/param.h>
67 #ifdef HAVE_SYS_STAT_H
68 # include <sys/stat.h>
70 #ifdef HAVE_SYS_TIME_H
71 # include <sys/time.h>
73 #include <sys/socket.h>
89 #include "openbsd-compat/sys-queue.h"
103 #include "readconf.h"
104 #include "clientloop.h"
105 #include "sshconnect.h"
107 #include "atomicio.h"
115 extern Options options;
117 /* Flag indicating that stdin should be redirected from /dev/null. */
118 extern int stdin_null_flag;
120 /* Flag indicating that no shell has been requested */
121 extern int no_shell_flag;
124 extern int muxserver_sock;
127 * Name of the host we are connecting to. This is the name given on the
128 * command line, or the HostName specified for the user-supplied name in a
129 * configuration file.
134 * Flag to indicate that we have received a window change signal which has
135 * not yet been processed. This will cause a message indicating the new
136 * window size to be sent to the server a little later. This is volatile
137 * because this is updated in a signal handler.
139 static volatile sig_atomic_t received_window_change_signal = 0;
140 static volatile sig_atomic_t received_signal = 0;
142 /* Flag indicating whether the user's terminal is in non-blocking mode. */
143 static int in_non_blocking_mode = 0;
145 /* Common data for the client loop code. */
146 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
147 static int escape_char1; /* Escape character. (proto1 only) */
148 static int escape_pending1; /* Last character was an escape (proto1 only) */
149 static int last_was_cr; /* Last character was a newline. */
150 static int exit_status; /* Used to store the command exit status. */
151 static int stdin_eof; /* EOF has been encountered on stderr. */
152 static Buffer stdin_buffer; /* Buffer for stdin data. */
153 static Buffer stdout_buffer; /* Buffer for stdout data. */
154 static Buffer stderr_buffer; /* Buffer for stderr data. */
155 static u_int buffer_high;/* Soft max buffer size. */
156 static int connection_in; /* Connection to server (input). */
157 static int connection_out; /* Connection to server (output). */
158 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
159 static int session_closed = 0; /* In SSH2: login session closed. */
161 static void client_init_dispatch(void);
162 int session_ident = -1;
164 /* 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 packet_set_alive_timeouts(0);
499 server_alive_check(void)
501 if (packet_inc_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)
639 char buf[SSH_IOBUFSZ];
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 = roaming_read(connection_in, buf, sizeof(buf), &cont);
648 if (len == 0 && cont == 0) {
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;
768 int local = 0, remote = 0, dynamic = 0;
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(" -D[bind_address:]port "
794 "Request dynamic forward");
795 logit(" -KR[bind_address:]port "
796 "Cancel remote forward");
797 if (!options.permit_local_command)
800 "Execute local command");
804 if (*s == '!' && options.permit_local_command) {
821 logit("Invalid command.");
825 if ((local || dynamic) && delete) {
826 logit("Not supported.");
829 if (remote && delete && !compat20) {
830 logit("Not supported for SSH protocol version 1.");
834 while (isspace(*++s))
839 cancel_host = hpdelim(&s); /* may be NULL */
841 cancel_port = a2port(s);
842 cancel_host = cleanhostname(cancel_host);
844 cancel_port = a2port(cancel_host);
847 if (cancel_port <= 0) {
848 logit("Bad forwarding close port");
851 channel_request_rforward_cancel(cancel_host, cancel_port);
853 if (!parse_forward(&fwd, s, dynamic, remote)) {
854 logit("Bad forwarding specification.");
857 if (local || dynamic) {
858 if (channel_setup_local_fwd_listener(fwd.listen_host,
859 fwd.listen_port, fwd.connect_host,
860 fwd.connect_port, options.gateway_ports) < 0) {
861 logit("Port forwarding failed.");
865 if (channel_request_remote_forwarding(fwd.listen_host,
866 fwd.listen_port, fwd.connect_host,
867 fwd.connect_port) < 0) {
868 logit("Port forwarding failed.");
873 logit("Forwarding port.");
877 signal(SIGINT, handler);
881 if (fwd.listen_host != NULL)
882 xfree(fwd.listen_host);
883 if (fwd.connect_host != NULL)
884 xfree(fwd.connect_host);
888 * Process the characters one by one, call with c==NULL for proto1 case.
891 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
900 int *escape_pendingp, escape_char;
901 struct escape_filter_ctx *efc;
904 escape_pendingp = &escape_pending1;
905 escape_char = escape_char1;
907 if (c->filter_ctx == NULL)
909 efc = (struct escape_filter_ctx *)c->filter_ctx;
910 escape_pendingp = &efc->escape_pending;
911 escape_char = efc->escape_char;
917 for (i = 0; i < (u_int)len; i++) {
918 /* Get one character at a time. */
921 if (*escape_pendingp) {
922 /* We have previously seen an escape character. */
923 /* Clear the flag now. */
924 *escape_pendingp = 0;
926 /* Process the escaped character. */
929 /* Terminate the connection. */
930 snprintf(string, sizeof string, "%c.\r\n",
932 buffer_append(berr, string, strlen(string));
934 if (c && c->ctl_fd != -1) {
936 chan_write_failed(c);
943 /* XXX support this for mux clients */
944 if (c && c->ctl_fd != -1) {
946 snprintf(string, sizeof string,
947 "%c%c escape not available to "
948 "multiplexed sessions\r\n",
950 buffer_append(berr, string,
954 /* Suspend the program. Inform the user */
955 snprintf(string, sizeof string,
956 "%c^Z [suspend ssh]\r\n", escape_char);
957 buffer_append(berr, string, strlen(string));
959 /* Restore terminal modes and suspend. */
960 client_suspend_self(bin, bout, berr);
962 /* We have been continued. */
967 snprintf(string, sizeof string,
968 "%cB\r\n", escape_char);
969 buffer_append(berr, string,
971 channel_request_start(session_ident,
973 packet_put_int(1000);
980 if (datafellows & SSH_BUG_NOREKEY)
981 logit("Server does not "
982 "support re-keying");
989 if (c && c->ctl_fd != -1)
992 * Detach the program (continue to serve
993 * connections, but put in background and no
994 * more new connections).
996 /* Restore tty modes. */
999 /* Stop listening for new connections. */
1000 channel_stop_listening();
1002 snprintf(string, sizeof string,
1003 "%c& [backgrounded]\n", escape_char);
1004 buffer_append(berr, string, strlen(string));
1006 /* Fork into background. */
1009 error("fork: %.100s", strerror(errno));
1012 if (pid != 0) { /* This is the parent. */
1013 /* The parent just exits. */
1016 /* The child continues serving connections. */
1018 buffer_append(bin, "\004", 1);
1019 /* fake EOF on stdin */
1021 } else if (!stdin_eof) {
1023 * Sending SSH_CMSG_EOF alone does not
1024 * always appear to be enough. So we
1025 * try to send an EOF character first.
1027 packet_start(SSH_CMSG_STDIN_DATA);
1028 packet_put_string("\004", 1);
1032 if (buffer_len(bin) == 0) {
1033 packet_start(SSH_CMSG_EOF);
1040 if (c && c->ctl_fd != -1) {
1041 snprintf(string, sizeof string,
1043 Supported escape sequences:\r\n\
1044 %c. - terminate session\r\n\
1045 %cB - send a BREAK to the remote system\r\n\
1046 %cR - Request rekey (SSH protocol 2 only)\r\n\
1047 %c# - list forwarded connections\r\n\
1048 %c? - this message\r\n\
1049 %c%c - send the escape character by typing it twice\r\n\
1050 (Note that escapes are only recognized immediately after newline.)\r\n",
1051 escape_char, escape_char,
1052 escape_char, escape_char,
1053 escape_char, escape_char,
1054 escape_char, escape_char);
1056 snprintf(string, sizeof string,
1058 Supported escape sequences:\r\n\
1059 %c. - terminate connection (and any multiplexed sessions)\r\n\
1060 %cB - send a BREAK to the remote system\r\n\
1061 %cC - open a command line\r\n\
1062 %cR - Request rekey (SSH protocol 2 only)\r\n\
1063 %c^Z - suspend ssh\r\n\
1064 %c# - list forwarded connections\r\n\
1065 %c& - background ssh (when waiting for connections to terminate)\r\n\
1066 %c? - this message\r\n\
1067 %c%c - send the escape character by typing it twice\r\n\
1068 (Note that escapes are only recognized immediately after newline.)\r\n",
1069 escape_char, escape_char,
1070 escape_char, escape_char,
1071 escape_char, escape_char,
1072 escape_char, escape_char,
1073 escape_char, escape_char,
1076 buffer_append(berr, string, strlen(string));
1080 snprintf(string, sizeof string, "%c#\r\n",
1082 buffer_append(berr, string, strlen(string));
1083 s = channel_open_message();
1084 buffer_append(berr, s, strlen(s));
1089 if (c && c->ctl_fd != -1)
1095 if (ch != escape_char) {
1096 buffer_put_char(bin, escape_char);
1099 /* Escaped characters fall through here */
1104 * The previous character was not an escape char.
1105 * Check if this is an escape.
1107 if (last_was_cr && ch == escape_char) {
1109 * It is. Set the flag and continue to
1112 *escape_pendingp = 1;
1118 * Normal character. Record whether it was a newline,
1119 * and append it to the buffer.
1121 last_was_cr = (ch == '\r' || ch == '\n');
1122 buffer_put_char(bin, ch);
1129 client_process_input(fd_set *readset)
1132 char buf[SSH_IOBUFSZ];
1134 /* Read input from stdin. */
1135 if (FD_ISSET(fileno(stdin), readset)) {
1136 /* Read as much as possible. */
1137 len = read(fileno(stdin), buf, sizeof(buf));
1139 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
1140 return; /* we'll try again later */
1143 * Received EOF or error. They are treated
1144 * similarly, except that an error message is printed
1145 * if it was an error condition.
1148 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1150 buffer_append(&stderr_buffer, buf, strlen(buf));
1152 /* Mark that we have seen EOF. */
1155 * Send an EOF message to the server unless there is
1156 * data in the buffer. If there is data in the
1157 * buffer, no message will be sent now. Code
1158 * elsewhere will send the EOF when the buffer
1159 * becomes empty if stdin_eof is set.
1161 if (buffer_len(&stdin_buffer) == 0) {
1162 packet_start(SSH_CMSG_EOF);
1165 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1167 * Normal successful read, and no escape character.
1168 * Just append the data to buffer.
1170 buffer_append(&stdin_buffer, buf, len);
1173 * Normal, successful read. But we have an escape
1174 * character and have to process the characters one
1177 if (process_escapes(NULL, &stdin_buffer,
1178 &stdout_buffer, &stderr_buffer, buf, len) == -1)
1185 client_process_output(fd_set *writeset)
1190 /* Write buffered output to stdout. */
1191 if (FD_ISSET(fileno(stdout), writeset)) {
1192 /* Write as much data as possible. */
1193 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1194 buffer_len(&stdout_buffer));
1196 if (errno == EINTR || errno == EAGAIN ||
1197 errno == EWOULDBLOCK)
1201 * An error or EOF was encountered. Put an
1202 * error message to stderr buffer.
1204 snprintf(buf, sizeof buf,
1205 "write stdout: %.50s\r\n", strerror(errno));
1206 buffer_append(&stderr_buffer, buf, strlen(buf));
1211 /* Consume printed data from the buffer. */
1212 buffer_consume(&stdout_buffer, len);
1214 /* Write buffered output to stderr. */
1215 if (FD_ISSET(fileno(stderr), writeset)) {
1216 /* Write as much data as possible. */
1217 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1218 buffer_len(&stderr_buffer));
1220 if (errno == EINTR || errno == EAGAIN ||
1221 errno == EWOULDBLOCK)
1225 * EOF or error, but can't even print
1232 /* Consume printed characters from the buffer. */
1233 buffer_consume(&stderr_buffer, len);
1238 * Get packets from the connection input buffer, and process them as long as
1239 * there are packets available.
1241 * Any unknown packets received during the actual
1242 * session cause the session to terminate. This is
1243 * intended to make debugging easier since no
1244 * confirmations are sent. Any compatible protocol
1245 * extensions must be negotiated during the
1246 * preparatory phase.
1250 client_process_buffered_input_packets(void)
1252 dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1253 compat20 ? xxx_kex : NULL);
1256 /* scan buf[] for '~' before sending data to the peer */
1258 /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1260 client_new_escape_filter_ctx(int escape_char)
1262 struct escape_filter_ctx *ret;
1264 ret = xmalloc(sizeof(*ret));
1265 ret->escape_pending = 0;
1266 ret->escape_char = escape_char;
1270 /* Free the escape filter context on channel free */
1272 client_filter_cleanup(int cid, void *ctx)
1278 client_simple_escape_filter(Channel *c, char *buf, int len)
1280 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1283 return process_escapes(c, &c->input, &c->output, &c->extended,
1288 client_channel_closed(int id, void *arg)
1290 channel_cancel_cleanup(id);
1296 * Implements the interactive session with the server. This is called after
1297 * the user has been authenticated, and a command has been started on the
1298 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1299 * used as an escape character for terminating or suspending the session.
1303 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1305 fd_set *readset = NULL, *writeset = NULL;
1306 double start_time, total_time;
1307 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1308 u_int64_t ibytes, obytes;
1312 debug("Entering interactive session.");
1314 start_time = get_current_time();
1316 /* Initialize variables. */
1317 escape_pending1 = 0;
1321 buffer_high = 64 * 1024;
1322 connection_in = packet_get_connection_in();
1323 connection_out = packet_get_connection_out();
1324 max_fd = MAX(connection_in, connection_out);
1325 if (muxserver_sock != -1)
1326 max_fd = MAX(max_fd, muxserver_sock);
1329 /* enable nonblocking unless tty */
1330 if (!isatty(fileno(stdin)))
1331 set_nonblock(fileno(stdin));
1332 if (!isatty(fileno(stdout)))
1333 set_nonblock(fileno(stdout));
1334 if (!isatty(fileno(stderr)))
1335 set_nonblock(fileno(stderr));
1336 max_fd = MAX(max_fd, fileno(stdin));
1337 max_fd = MAX(max_fd, fileno(stdout));
1338 max_fd = MAX(max_fd, fileno(stderr));
1341 escape_char1 = escape_char_arg;
1343 /* Initialize buffers. */
1344 buffer_init(&stdin_buffer);
1345 buffer_init(&stdout_buffer);
1346 buffer_init(&stderr_buffer);
1348 client_init_dispatch();
1351 * Set signal handlers, (e.g. to restore non-blocking mode)
1352 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1354 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1355 signal(SIGHUP, signal_handler);
1356 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1357 signal(SIGINT, signal_handler);
1358 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1359 signal(SIGQUIT, signal_handler);
1360 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1361 signal(SIGTERM, signal_handler);
1362 signal(SIGWINCH, window_change_handler);
1368 session_ident = ssh2_chan_id;
1369 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1370 channel_register_filter(session_ident,
1371 client_simple_escape_filter, NULL,
1372 client_filter_cleanup,
1373 client_new_escape_filter_ctx(escape_char_arg));
1374 if (session_ident != -1)
1375 channel_register_cleanup(session_ident,
1376 client_channel_closed, 0);
1378 /* Check if we should immediately send eof on stdin. */
1379 client_check_initial_eof_on_stdin();
1382 /* Main loop of the client for the interactive session mode. */
1383 while (!quit_pending) {
1385 /* Process buffered packets sent by the server. */
1386 client_process_buffered_input_packets();
1388 if (compat20 && session_closed && !channel_still_open())
1391 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1394 debug("rekeying in progress");
1397 * Make packets of buffered stdin data, and buffer
1398 * them for sending to the server.
1401 client_make_packets_from_stdin_data();
1404 * Make packets from buffered channel data, and
1405 * enqueue them for sending to the server.
1407 if (packet_not_very_much_data_to_write())
1408 channel_output_poll();
1411 * Check if the window size has changed, and buffer a
1412 * message about it to the server if so.
1414 client_check_window_change();
1420 * Wait until we have something to do (something becomes
1421 * available on one of the descriptors).
1424 client_wait_until_can_do_something(&readset, &writeset,
1425 &max_fd2, &nalloc, rekeying);
1430 /* Do channel operations unless rekeying in progress. */
1432 channel_after_select(readset, writeset);
1433 if (need_rekeying || packet_need_rekeying()) {
1434 debug("need rekeying");
1436 kex_send_kexinit(xxx_kex);
1441 /* Buffer input from the connection. */
1442 client_process_net_input(readset);
1444 /* Accept control connections. */
1445 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1446 if (muxserver_accept_control())
1454 /* Buffer data from stdin */
1455 client_process_input(readset);
1457 * Process output to stdout and stderr. Output to
1458 * the connection is processed elsewhere (above).
1460 client_process_output(writeset);
1464 * Send as much buffered packet data as possible to the
1467 if (FD_ISSET(connection_out, writeset))
1468 packet_write_poll();
1475 /* Terminate the session. */
1477 /* Stop watching for window change. */
1478 signal(SIGWINCH, SIG_DFL);
1481 packet_start(SSH2_MSG_DISCONNECT);
1482 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1483 packet_put_cstring("disconnected by user");
1485 packet_write_wait();
1493 /* restore blocking io */
1494 if (!isatty(fileno(stdin)))
1495 unset_nonblock(fileno(stdin));
1496 if (!isatty(fileno(stdout)))
1497 unset_nonblock(fileno(stdout));
1498 if (!isatty(fileno(stderr)))
1499 unset_nonblock(fileno(stderr));
1502 * If there was no shell or command requested, there will be no remote
1503 * exit status to be returned. In that case, clear error code if the
1504 * connection was deliberately terminated at this end.
1506 if (no_shell_flag && received_signal == SIGTERM) {
1507 received_signal = 0;
1511 if (received_signal)
1512 fatal("Killed by signal %d.", (int) received_signal);
1515 * In interactive mode (with pseudo tty) display a message indicating
1516 * that the connection has been closed.
1518 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1519 snprintf(buf, sizeof buf,
1520 "Connection to %.64s closed.\r\n", host);
1521 buffer_append(&stderr_buffer, buf, strlen(buf));
1524 /* Output any buffered data for stdout. */
1525 while (buffer_len(&stdout_buffer) > 0) {
1526 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1527 buffer_len(&stdout_buffer));
1529 error("Write failed flushing stdout buffer.");
1532 buffer_consume(&stdout_buffer, len);
1535 /* Output any buffered data for stderr. */
1536 while (buffer_len(&stderr_buffer) > 0) {
1537 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1538 buffer_len(&stderr_buffer));
1540 error("Write failed flushing stderr buffer.");
1543 buffer_consume(&stderr_buffer, len);
1546 /* Clear and free any buffers. */
1547 memset(buf, 0, sizeof(buf));
1548 buffer_free(&stdin_buffer);
1549 buffer_free(&stdout_buffer);
1550 buffer_free(&stderr_buffer);
1552 /* Report bytes transferred, and transfer rates. */
1553 total_time = get_current_time() - start_time;
1554 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1555 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1556 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1557 obytes, ibytes, total_time);
1559 verbose("Bytes per second: sent %.1f, received %.1f",
1560 obytes / total_time, ibytes / total_time);
1561 /* Return the exit status of the program. */
1562 debug("Exit status %d", exit_status);
1569 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1572 char *data = packet_get_string(&data_len);
1574 buffer_append(&stdout_buffer, data, data_len);
1575 memset(data, 0, data_len);
1579 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1582 char *data = packet_get_string(&data_len);
1584 buffer_append(&stderr_buffer, data, data_len);
1585 memset(data, 0, data_len);
1589 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1591 exit_status = packet_get_int();
1593 /* Acknowledge the exit. */
1594 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1597 * Must wait for packet to be sent since we are
1600 packet_write_wait();
1601 /* Flag that we want to exit. */
1605 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1608 int remote_id, sock;
1610 /* Read the remote channel number from the message. */
1611 remote_id = packet_get_int();
1615 * Get a connection to the local authentication agent (this may again
1618 sock = ssh_get_authentication_socket();
1621 * If we could not connect the agent, send an error message back to
1622 * the server. This should never happen unless the agent dies,
1623 * because authentication forwarding is only enabled if we have an
1627 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1628 -1, 0, 0, 0, "authentication agent connection", 1);
1629 c->remote_id = remote_id;
1633 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1634 packet_put_int(remote_id);
1636 /* Send a confirmation to the remote host. */
1637 debug("Forwarding authentication connection.");
1638 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1639 packet_put_int(remote_id);
1640 packet_put_int(c->self);
1646 client_request_forwarded_tcpip(const char *request_type, int rchan)
1649 char *listen_address, *originator_address;
1650 u_short listen_port, originator_port;
1652 /* Get rest of the packet */
1653 listen_address = packet_get_string(NULL);
1654 listen_port = packet_get_int();
1655 originator_address = packet_get_string(NULL);
1656 originator_port = packet_get_int();
1659 debug("client_request_forwarded_tcpip: listen %s port %d, "
1660 "originator %s port %d", listen_address, listen_port,
1661 originator_address, originator_port);
1663 c = channel_connect_by_listen_address(listen_port,
1664 "forwarded-tcpip", originator_address);
1666 xfree(originator_address);
1667 xfree(listen_address);
1672 client_request_x11(const char *request_type, int rchan)
1676 u_short originator_port;
1679 if (!options.forward_x11) {
1680 error("Warning: ssh server tried X11 forwarding.");
1681 error("Warning: this is probably a break-in attempt by a "
1682 "malicious server.");
1685 originator = packet_get_string(NULL);
1686 if (datafellows & SSH_BUG_X11FWD) {
1687 debug2("buggy server: x11 request w/o originator_port");
1688 originator_port = 0;
1690 originator_port = packet_get_int();
1693 /* XXX check permission */
1694 debug("client_request_x11: request from %s %d", originator,
1697 sock = x11_connect_display();
1700 /* again is this really necessary for X11? */
1701 if (options.hpn_disabled)
1702 c = channel_new("x11",
1703 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1704 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1706 c = channel_new("x11",
1707 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1708 options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1714 client_request_agent(const char *request_type, int rchan)
1719 if (!options.forward_agent) {
1720 error("Warning: ssh server tried agent forwarding.");
1721 error("Warning: this is probably a break-in attempt by a "
1722 "malicious server.");
1725 sock = ssh_get_authentication_socket();
1728 if (options.hpn_disabled)
1729 c = channel_new("authentication agent connection",
1730 SSH_CHANNEL_OPEN, sock, sock, -1,
1731 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1732 "authentication agent connection", 1);
1734 c = channel_new("authentication agent connection",
1735 SSH_CHANNEL_OPEN, sock, sock, -1,
1736 options.hpn_buffer_size, options.hpn_buffer_size, 0,
1737 "authentication agent connection", 1);
1743 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1748 if (tun_mode == SSH_TUNMODE_NO)
1752 error("Tunnel forwarding is not supported for protocol 1");
1756 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1758 /* Open local tunnel device */
1759 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1760 error("Tunnel device open failed.");
1764 if(options.hpn_disabled)
1765 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1766 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1769 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1770 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1776 #if defined(SSH_TUN_FILTER)
1777 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1778 channel_register_filter(c->self, sys_tun_infilter,
1779 sys_tun_outfilter, NULL, NULL);
1782 packet_start(SSH2_MSG_CHANNEL_OPEN);
1783 packet_put_cstring("tun@openssh.com");
1784 packet_put_int(c->self);
1785 packet_put_int(c->local_window_max);
1786 packet_put_int(c->local_maxpacket);
1787 packet_put_int(tun_mode);
1788 packet_put_int(remote_tun);
1794 /* XXXX move to generic input handler */
1796 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1801 u_int rmaxpack, rwindow, len;
1803 ctype = packet_get_string(&len);
1804 rchan = packet_get_int();
1805 rwindow = packet_get_int();
1806 rmaxpack = packet_get_int();
1808 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1809 ctype, rchan, rwindow, rmaxpack);
1811 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1812 c = client_request_forwarded_tcpip(ctype, rchan);
1813 } else if (strcmp(ctype, "x11") == 0) {
1814 c = client_request_x11(ctype, rchan);
1815 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1816 c = client_request_agent(ctype, rchan);
1818 /* XXX duplicate : */
1820 debug("confirm %s", ctype);
1821 c->remote_id = rchan;
1822 c->remote_window = rwindow;
1823 c->remote_maxpacket = rmaxpack;
1824 if (c->type != SSH_CHANNEL_CONNECTING) {
1825 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1826 packet_put_int(c->remote_id);
1827 packet_put_int(c->self);
1828 packet_put_int(c->local_window);
1829 packet_put_int(c->local_maxpacket);
1833 debug("failure %s", ctype);
1834 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1835 packet_put_int(rchan);
1836 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1837 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1838 packet_put_cstring("open failed");
1839 packet_put_cstring("");
1846 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1849 int exitval, id, reply, success = 0;
1852 id = packet_get_int();
1853 rtype = packet_get_string(NULL);
1854 reply = packet_get_char();
1856 debug("client_input_channel_req: channel %d rtype %s reply %d",
1860 error("client_input_channel_req: request for channel -1");
1861 } else if ((c = channel_lookup(id)) == NULL) {
1862 error("client_input_channel_req: channel %d: "
1863 "unknown channel", id);
1864 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1867 } else if (strcmp(rtype, "exit-status") == 0) {
1868 exitval = packet_get_int();
1869 if (id == session_ident) {
1871 exit_status = exitval;
1872 } else if (c->ctl_fd == -1) {
1873 error("client_input_channel_req: unexpected channel %d",
1876 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1882 packet_start(success ?
1883 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1884 packet_put_int(c->remote_id);
1890 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1896 rtype = packet_get_string(NULL);
1897 want_reply = packet_get_char();
1898 debug("client_input_global_request: rtype %s want_reply %d",
1901 packet_start(success ?
1902 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1904 packet_write_wait();
1910 client_session2_setup(int id, int want_tty, int want_subsystem,
1911 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1916 debug2("%s: id %d", __func__, id);
1918 if ((c = channel_lookup(id)) == NULL)
1919 fatal("client_session2_setup: channel %d: unknown channel", id);
1924 /* Store window size in the packet. */
1925 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1926 memset(&ws, 0, sizeof(ws));
1928 channel_request_start(id, "pty-req", 1);
1929 client_expect_confirm(id, "PTY allocation", 0);
1930 packet_put_cstring(term != NULL ? term : "");
1931 packet_put_int((u_int)ws.ws_col);
1932 packet_put_int((u_int)ws.ws_row);
1933 packet_put_int((u_int)ws.ws_xpixel);
1934 packet_put_int((u_int)ws.ws_ypixel);
1936 tiop = get_saved_tio();
1937 tty_make_modes(-1, tiop);
1939 /* XXX wait for reply */
1943 /* Transfer any environment variables from client to server */
1944 if (options.num_send_env != 0 && env != NULL) {
1948 debug("Sending environment.");
1949 for (i = 0; env[i] != NULL; i++) {
1951 name = xstrdup(env[i]);
1952 if ((val = strchr(name, '=')) == NULL) {
1959 for (j = 0; j < options.num_send_env; j++) {
1960 if (match_pattern(name, options.send_env[j])) {
1966 debug3("Ignored env %s", name);
1971 debug("Sending env %s = %s", name, val);
1972 channel_request_start(id, "env", 0);
1973 packet_put_cstring(name);
1974 packet_put_cstring(val);
1980 len = buffer_len(cmd);
1984 if (want_subsystem) {
1985 debug("Sending subsystem: %.*s",
1986 len, (u_char*)buffer_ptr(cmd));
1987 channel_request_start(id, "subsystem", 1);
1988 client_expect_confirm(id, "subsystem", 1);
1990 debug("Sending command: %.*s",
1991 len, (u_char*)buffer_ptr(cmd));
1992 channel_request_start(id, "exec", 1);
1993 client_expect_confirm(id, "exec", 1);
1995 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1998 channel_request_start(id, "shell", 1);
1999 client_expect_confirm(id, "shell", 1);
2005 client_init_dispatch_20(void)
2007 dispatch_init(&dispatch_protocol_error);
2009 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2010 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2011 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2012 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2013 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2014 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2015 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2016 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2017 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2018 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2019 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2020 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2023 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2025 /* global request reply messages */
2026 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2027 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2031 client_init_dispatch_13(void)
2033 dispatch_init(NULL);
2034 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2035 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2036 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2037 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2038 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2039 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2040 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2041 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2042 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2044 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2045 &client_input_agent_open : &deny_input_open);
2046 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2047 &x11_input_open : &deny_input_open);
2051 client_init_dispatch_15(void)
2053 client_init_dispatch_13();
2054 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2055 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2059 client_init_dispatch(void)
2062 client_init_dispatch_20();
2064 client_init_dispatch_13();
2066 client_init_dispatch_15();
2069 /* client specific fatal cleanup */
2074 leave_non_blocking();
2075 if (options.control_path != NULL && muxserver_sock != -1)
2076 unlink(options.control_path);