1 /* $OpenBSD: clientloop.c,v 1.199 2008/06/12 21:06:25 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_long stdin_bytes, stdout_bytes, stderr_bytes;
156 static u_int buffer_high;/* Soft max buffer size. */
157 static int connection_in; /* Connection to server (input). */
158 static int connection_out; /* Connection to server (output). */
159 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
160 static int session_closed = 0; /* In SSH2: login session closed. */
162 static void client_init_dispatch(void);
163 int session_ident = -1;
165 /* Track escape per proto2 channel */
166 struct escape_filter_ctx {
171 /* Context for channel confirmation replies */
172 struct channel_reply_ctx {
173 const char *request_type;
177 /* Global request success/failure callbacks */
178 struct global_confirm {
179 TAILQ_ENTRY(global_confirm) entry;
180 global_confirm_cb *cb;
184 TAILQ_HEAD(global_confirms, global_confirm);
185 static struct global_confirms global_confirms =
186 TAILQ_HEAD_INITIALIZER(global_confirms);
191 void ssh_process_session2_setup(int, int, int, Buffer *);
193 /* Restores stdin to blocking mode. */
196 leave_non_blocking(void)
198 if (in_non_blocking_mode) {
199 unset_nonblock(fileno(stdin));
200 in_non_blocking_mode = 0;
204 /* Puts stdin terminal in non-blocking mode. */
207 enter_non_blocking(void)
209 in_non_blocking_mode = 1;
210 set_nonblock(fileno(stdin));
214 * Signal handler for the window change signal (SIGWINCH). This just sets a
215 * flag indicating that the window has changed.
219 window_change_handler(int sig)
221 received_window_change_signal = 1;
222 signal(SIGWINCH, window_change_handler);
226 * Signal handler for signals that cause the program to terminate. These
227 * signals must be trapped to restore terminal modes.
231 signal_handler(int sig)
233 received_signal = sig;
238 * Returns current time in seconds from Jan 1, 1970 with the maximum
239 * available resolution.
243 get_current_time(void)
246 gettimeofday(&tv, NULL);
247 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
250 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
252 client_x11_get_proto(const char *display, const char *xauth_path,
253 u_int trusted, char **_proto, char **_data)
258 static char proto[512], data[512];
260 int got_data = 0, generated = 0, do_unlink = 0, i;
261 char *xauthdir, *xauthfile;
264 xauthdir = xauthfile = NULL;
267 proto[0] = data[0] = '\0';
269 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
270 debug("No xauth program.");
272 if (display == NULL) {
273 debug("x11_get_proto: DISPLAY not set");
277 * Handle FamilyLocal case where $DISPLAY does
278 * not match an authorization entry. For this we
279 * just try "xauth list unix:displaynum.screennum".
280 * XXX: "localhost" match to determine FamilyLocal
283 if (strncmp(display, "localhost:", 10) == 0) {
284 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
289 xauthdir = xmalloc(MAXPATHLEN);
290 xauthfile = xmalloc(MAXPATHLEN);
291 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
292 if (mkdtemp(xauthdir) != NULL) {
294 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
296 snprintf(cmd, sizeof(cmd),
297 "%s -f %s generate %s " SSH_X11_PROTO
298 " untrusted timeout 1200 2>" _PATH_DEVNULL,
299 xauth_path, xauthfile, display);
300 debug2("x11_get_proto: %s", cmd);
301 if (system(cmd) == 0)
307 * When in untrusted mode, we read the cookie only if it was
308 * successfully generated as an untrusted one in the step
311 if (trusted || generated) {
312 snprintf(cmd, sizeof(cmd),
313 "%s %s%s list %s 2>" _PATH_DEVNULL,
315 generated ? "-f " : "" ,
316 generated ? xauthfile : "",
318 debug2("x11_get_proto: %s", cmd);
320 if (f && fgets(line, sizeof(line), f) &&
321 sscanf(line, "%*s %511s %511s", proto, data) == 2)
326 error("Warning: untrusted X11 forwarding setup failed: "
327 "xauth key data not generated");
340 * If we didn't get authentication data, just make up some
341 * data. The forwarding code will check the validity of the
342 * response anyway, and substitute this data. The X11
343 * server, however, will ignore this fake data and use
344 * whatever authentication mechanisms it was using otherwise
345 * for the local connection.
350 logit("Warning: No xauth data; "
351 "using fake authentication data for X11 forwarding.");
352 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
353 for (i = 0; i < 16; i++) {
356 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
364 * This is called when the interactive is entered. This checks if there is
365 * an EOF coming on stdin. We must check this explicitly, as select() does
366 * not appear to wake up when redirecting from /dev/null.
370 client_check_initial_eof_on_stdin(void)
376 * If standard input is to be "redirected from /dev/null", we simply
377 * mark that we have seen an EOF and send an EOF message to the
378 * server. Otherwise, we try to read a single character; it appears
379 * that for some files, such /dev/null, select() never wakes up for
380 * read for this descriptor, which means that we never get EOF. This
381 * way we will get the EOF if stdin comes from /dev/null or similar.
383 if (stdin_null_flag) {
384 /* Fake EOF on stdin. */
385 debug("Sending eof.");
387 packet_start(SSH_CMSG_EOF);
390 enter_non_blocking();
392 /* Check for immediate EOF on stdin. */
393 len = read(fileno(stdin), buf, 1);
396 * EOF. Record that we have seen it and send
399 debug("Sending eof.");
401 packet_start(SSH_CMSG_EOF);
403 } else if (len > 0) {
405 * Got data. We must store the data in the buffer,
406 * and also process it as an escape character if
409 if ((u_char) buf[0] == escape_char1)
412 buffer_append(&stdin_buffer, buf, 1);
414 leave_non_blocking();
420 * Make packets from buffered stdin data, and buffer them for sending to the
425 client_make_packets_from_stdin_data(void)
429 /* Send buffered stdin data to the server. */
430 while (buffer_len(&stdin_buffer) > 0 &&
431 packet_not_very_much_data_to_write()) {
432 len = buffer_len(&stdin_buffer);
433 /* Keep the packets at reasonable size. */
434 if (len > packet_get_maxsize())
435 len = packet_get_maxsize();
436 packet_start(SSH_CMSG_STDIN_DATA);
437 packet_put_string(buffer_ptr(&stdin_buffer), len);
439 buffer_consume(&stdin_buffer, len);
441 /* If we have a pending EOF, send it now. */
442 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
443 packet_start(SSH_CMSG_EOF);
450 * Checks if the client window has changed, and sends a packet about it to
451 * the server if so. The actual change is detected elsewhere (by a software
452 * interrupt on Unix); this just checks the flag and sends a message if
457 client_check_window_change(void)
461 if (! received_window_change_signal)
464 received_window_change_signal = 0;
466 debug2("client_check_window_change: changed");
469 channel_send_window_changes();
471 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
473 packet_start(SSH_CMSG_WINDOW_SIZE);
474 packet_put_int((u_int)ws.ws_row);
475 packet_put_int((u_int)ws.ws_col);
476 packet_put_int((u_int)ws.ws_xpixel);
477 packet_put_int((u_int)ws.ws_ypixel);
483 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
485 struct global_confirm *gc;
487 if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
490 gc->cb(type, seq, gc->ctx);
491 if (--gc->ref_count <= 0) {
492 TAILQ_REMOVE(&global_confirms, gc, entry);
493 bzero(gc, sizeof(*gc));
497 keep_alive_timeouts = 0;
501 server_alive_check(void)
503 if (++keep_alive_timeouts > options.server_alive_count_max) {
504 logit("Timeout, server not responding.");
507 packet_start(SSH2_MSG_GLOBAL_REQUEST);
508 packet_put_cstring("keepalive@openssh.com");
509 packet_put_char(1); /* boolean: want reply */
511 /* Insert an empty placeholder to maintain ordering */
512 client_register_global_confirm(NULL, NULL);
516 * Waits until the client can do something (some data becomes available on
517 * one of the file descriptors).
520 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
521 int *maxfdp, u_int *nallocp, int rekeying)
523 struct timeval tv, *tvp;
526 /* Add any selections by the channel mechanism. */
527 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
530 /* Read from the connection, unless our buffers are full. */
531 if (buffer_len(&stdout_buffer) < buffer_high &&
532 buffer_len(&stderr_buffer) < buffer_high &&
533 channel_not_very_much_buffered_data())
534 FD_SET(connection_in, *readsetp);
536 * Read from stdin, unless we have seen EOF or have very much
537 * buffered data to send to the server.
539 if (!stdin_eof && packet_not_very_much_data_to_write())
540 FD_SET(fileno(stdin), *readsetp);
542 /* Select stdout/stderr if have data in buffer. */
543 if (buffer_len(&stdout_buffer) > 0)
544 FD_SET(fileno(stdout), *writesetp);
545 if (buffer_len(&stderr_buffer) > 0)
546 FD_SET(fileno(stderr), *writesetp);
548 /* channel_prepare_select could have closed the last channel */
549 if (session_closed && !channel_still_open() &&
550 !packet_have_data_to_write()) {
551 /* clear mask since we did not call select() */
552 memset(*readsetp, 0, *nallocp);
553 memset(*writesetp, 0, *nallocp);
556 FD_SET(connection_in, *readsetp);
560 /* Select server connection if have data to write to the server. */
561 if (packet_have_data_to_write())
562 FD_SET(connection_out, *writesetp);
564 if (muxserver_sock != -1)
565 FD_SET(muxserver_sock, *readsetp);
568 * Wait for something to happen. This will suspend the process until
569 * some selected descriptor can be read, written, or has some other
573 if (options.server_alive_interval == 0 || !compat20)
576 tv.tv_sec = options.server_alive_interval;
580 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
585 * We have to clear the select masks, because we return.
586 * We have to return, because the mainloop checks for the flags
587 * set by the signal handlers.
589 memset(*readsetp, 0, *nallocp);
590 memset(*writesetp, 0, *nallocp);
594 /* Note: we might still have data in the buffers. */
595 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
596 buffer_append(&stderr_buffer, buf, strlen(buf));
599 server_alive_check();
603 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
605 /* Flush stdout and stderr buffers. */
606 if (buffer_len(bout) > 0)
607 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
609 if (buffer_len(berr) > 0)
610 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
616 * Free (and clear) the buffer to reduce the amount of data that gets
623 /* Send the suspend signal to the program itself. */
624 kill(getpid(), SIGTSTP);
626 /* Reset window sizes in case they have changed */
627 received_window_change_signal = 1;
629 /* OK, we have been continued by the user. Reinitialize buffers. */
638 client_process_net_input(fd_set *readset)
644 * Read input from the server, and add any such data to the buffer of
645 * the packet subsystem.
647 if (FD_ISSET(connection_in, readset)) {
648 /* Read as much as possible. */
649 len = read(connection_in, buf, sizeof(buf));
652 * Received EOF. The remote host has closed the
655 snprintf(buf, sizeof buf,
656 "Connection to %.300s closed by remote host.\r\n",
658 buffer_append(&stderr_buffer, buf, strlen(buf));
663 * There is a kernel bug on Solaris that causes select to
664 * sometimes wake up even though there is no data available.
666 if (len < 0 && (errno == EAGAIN || errno == EINTR))
671 * An error has encountered. Perhaps there is a
674 snprintf(buf, sizeof buf,
675 "Read from remote host %.300s: %.100s\r\n",
676 host, strerror(errno));
677 buffer_append(&stderr_buffer, buf, strlen(buf));
681 packet_process_incoming(buf, len);
686 client_status_confirm(int type, Channel *c, void *ctx)
688 struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
692 /* XXX supress on mux _client_ quietmode */
693 tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
694 c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
696 if (type == SSH2_MSG_CHANNEL_SUCCESS) {
697 debug2("%s request accepted on channel %d",
698 cr->request_type, c->self);
699 } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
701 snprintf(errmsg, sizeof(errmsg),
702 "%s request failed\r\n", cr->request_type);
704 snprintf(errmsg, sizeof(errmsg),
705 "%s request failed on channel %d",
706 cr->request_type, c->self);
708 /* If error occurred on primary session channel, then exit */
709 if (cr->do_close && c->self == session_ident)
711 /* If error occurred on mux client, append to their stderr */
713 buffer_append(&c->extended, errmsg, strlen(errmsg));
718 chan_write_failed(c);
725 client_abandon_status_confirm(Channel *c, void *ctx)
731 client_expect_confirm(int id, const char *request, int do_close)
733 struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
735 cr->request_type = request;
736 cr->do_close = do_close;
738 channel_register_status_confirm(id, client_status_confirm,
739 client_abandon_status_confirm, cr);
743 client_register_global_confirm(global_confirm_cb *cb, void *ctx)
745 struct global_confirm *gc, *first_gc;
747 /* Coalesce identical callbacks */
748 first_gc = TAILQ_LAST(&global_confirms, global_confirms);
749 if (first_gc && first_gc->cb == cb && first_gc->ctx == ctx) {
750 if (++first_gc->ref_count >= INT_MAX)
751 fatal("%s: first_gc->ref_count = %d",
752 __func__, first_gc->ref_count);
756 gc = xmalloc(sizeof(*gc));
760 TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
764 process_cmdline(void)
766 void (*handler)(int);
767 char *s, *cmd, *cancel_host;
773 bzero(&fwd, sizeof(fwd));
774 fwd.listen_host = fwd.connect_host = NULL;
777 handler = signal(SIGINT, SIG_IGN);
778 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
784 s++; /* Skip cmdline '-', if any */
788 if (*s == 'h' || *s == 'H' || *s == '?') {
790 logit(" -L[bind_address:]port:host:hostport "
791 "Request local forward");
792 logit(" -R[bind_address:]port:host:hostport "
793 "Request remote forward");
794 logit(" -KR[bind_address:]port "
795 "Cancel remote forward");
796 if (!options.permit_local_command)
799 "Execute local command");
803 if (*s == '!' && options.permit_local_command) {
813 if (*s != 'L' && *s != 'R') {
814 logit("Invalid command.");
819 if (local && delete) {
820 logit("Not supported.");
823 if ((!local || delete) && !compat20) {
824 logit("Not supported for SSH protocol version 1.");
828 while (isspace(*++s))
833 cancel_host = hpdelim(&s); /* may be NULL */
835 cancel_port = a2port(s);
836 cancel_host = cleanhostname(cancel_host);
838 cancel_port = a2port(cancel_host);
841 if (cancel_port == 0) {
842 logit("Bad forwarding close port");
845 channel_request_rforward_cancel(cancel_host, cancel_port);
847 if (!parse_forward(&fwd, s)) {
848 logit("Bad forwarding specification.");
852 if (channel_setup_local_fwd_listener(fwd.listen_host,
853 fwd.listen_port, fwd.connect_host,
854 fwd.connect_port, options.gateway_ports) < 0) {
855 logit("Port forwarding failed.");
859 if (channel_request_remote_forwarding(fwd.listen_host,
860 fwd.listen_port, fwd.connect_host,
861 fwd.connect_port) < 0) {
862 logit("Port forwarding failed.");
867 logit("Forwarding port.");
871 signal(SIGINT, handler);
875 if (fwd.listen_host != NULL)
876 xfree(fwd.listen_host);
877 if (fwd.connect_host != NULL)
878 xfree(fwd.connect_host);
882 * Process the characters one by one, call with c==NULL for proto1 case.
885 process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
894 int *escape_pendingp, escape_char;
895 struct escape_filter_ctx *efc;
898 escape_pendingp = &escape_pending1;
899 escape_char = escape_char1;
901 if (c->filter_ctx == NULL)
903 efc = (struct escape_filter_ctx *)c->filter_ctx;
904 escape_pendingp = &efc->escape_pending;
905 escape_char = efc->escape_char;
911 for (i = 0; i < (u_int)len; i++) {
912 /* Get one character at a time. */
915 if (*escape_pendingp) {
916 /* We have previously seen an escape character. */
917 /* Clear the flag now. */
918 *escape_pendingp = 0;
920 /* Process the escaped character. */
923 /* Terminate the connection. */
924 snprintf(string, sizeof string, "%c.\r\n",
926 buffer_append(berr, string, strlen(string));
928 if (c && c->ctl_fd != -1) {
930 chan_write_failed(c);
937 /* XXX support this for mux clients */
938 if (c && c->ctl_fd != -1) {
940 snprintf(string, sizeof string,
941 "%c%c escape not available to "
942 "multiplexed sessions\r\n",
944 buffer_append(berr, string,
948 /* Suspend the program. Inform the user */
949 snprintf(string, sizeof string,
950 "%c^Z [suspend ssh]\r\n", escape_char);
951 buffer_append(berr, string, strlen(string));
953 /* Restore terminal modes and suspend. */
954 client_suspend_self(bin, bout, berr);
956 /* We have been continued. */
961 snprintf(string, sizeof string,
962 "%cB\r\n", escape_char);
963 buffer_append(berr, string,
965 channel_request_start(session_ident,
967 packet_put_int(1000);
974 if (datafellows & SSH_BUG_NOREKEY)
975 logit("Server does not "
976 "support re-keying");
983 if (c && c->ctl_fd != -1)
986 * Detach the program (continue to serve
987 * connections, but put in background and no
988 * more new connections).
990 /* Restore tty modes. */
993 /* Stop listening for new connections. */
994 channel_stop_listening();
996 snprintf(string, sizeof string,
997 "%c& [backgrounded]\n", escape_char);
998 buffer_append(berr, string, strlen(string));
1000 /* Fork into background. */
1003 error("fork: %.100s", strerror(errno));
1006 if (pid != 0) { /* This is the parent. */
1007 /* The parent just exits. */
1010 /* The child continues serving connections. */
1012 buffer_append(bin, "\004", 1);
1013 /* fake EOF on stdin */
1015 } else if (!stdin_eof) {
1017 * Sending SSH_CMSG_EOF alone does not
1018 * always appear to be enough. So we
1019 * try to send an EOF character first.
1021 packet_start(SSH_CMSG_STDIN_DATA);
1022 packet_put_string("\004", 1);
1026 if (buffer_len(bin) == 0) {
1027 packet_start(SSH_CMSG_EOF);
1034 if (c && c->ctl_fd != -1) {
1035 snprintf(string, sizeof string,
1037 Supported escape sequences:\r\n\
1038 %c. - terminate session\r\n\
1039 %cB - send a BREAK to the remote system\r\n\
1040 %cC - open a command line\r\n\
1041 %cR - Request rekey (SSH protocol 2 only)\r\n\
1042 %c# - list forwarded connections\r\n\
1043 %c? - this message\r\n\
1044 %c%c - send the escape character by typing it twice\r\n\
1045 (Note that escapes are only recognized immediately after newline.)\r\n",
1046 escape_char, escape_char,
1047 escape_char, escape_char,
1048 escape_char, escape_char,
1049 escape_char, escape_char,
1052 snprintf(string, sizeof string,
1054 Supported escape sequences:\r\n\
1055 %c. - terminate connection (and any multiplexed sessions)\r\n\
1056 %cB - send a BREAK to the remote system\r\n\
1057 %cC - open a command line\r\n\
1058 %cR - Request rekey (SSH protocol 2 only)\r\n\
1059 %c^Z - suspend ssh\r\n\
1060 %c# - list forwarded connections\r\n\
1061 %c& - background ssh (when waiting for connections to terminate)\r\n\
1062 %c? - this message\r\n\
1063 %c%c - send the escape character by typing it twice\r\n\
1064 (Note that escapes are only recognized immediately after newline.)\r\n",
1065 escape_char, escape_char,
1066 escape_char, escape_char,
1067 escape_char, escape_char,
1068 escape_char, escape_char,
1069 escape_char, escape_char,
1072 buffer_append(berr, string, strlen(string));
1076 snprintf(string, sizeof string, "%c#\r\n",
1078 buffer_append(berr, string, strlen(string));
1079 s = channel_open_message();
1080 buffer_append(berr, s, strlen(s));
1089 if (ch != escape_char) {
1090 buffer_put_char(bin, escape_char);
1093 /* Escaped characters fall through here */
1098 * The previous character was not an escape char.
1099 * Check if this is an escape.
1101 if (last_was_cr && ch == escape_char) {
1103 * It is. Set the flag and continue to
1106 *escape_pendingp = 1;
1112 * Normal character. Record whether it was a newline,
1113 * and append it to the buffer.
1115 last_was_cr = (ch == '\r' || ch == '\n');
1116 buffer_put_char(bin, ch);
1123 client_process_input(fd_set *readset)
1128 /* Read input from stdin. */
1129 if (FD_ISSET(fileno(stdin), readset)) {
1130 /* Read as much as possible. */
1131 len = read(fileno(stdin), buf, sizeof(buf));
1132 if (len < 0 && (errno == EAGAIN || errno == EINTR))
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)
1193 * An error or EOF was encountered. Put an
1194 * error message to stderr buffer.
1196 snprintf(buf, sizeof buf,
1197 "write stdout: %.50s\r\n", strerror(errno));
1198 buffer_append(&stderr_buffer, buf, strlen(buf));
1203 /* Consume printed data from the buffer. */
1204 buffer_consume(&stdout_buffer, len);
1205 stdout_bytes += 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)
1217 * EOF or error, but can't even print
1224 /* Consume printed characters from the buffer. */
1225 buffer_consume(&stderr_buffer, len);
1226 stderr_bytes += 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;
1304 debug("Entering interactive session.");
1306 start_time = get_current_time();
1308 /* Initialize variables. */
1309 escape_pending1 = 0;
1313 buffer_high = 64 * 1024;
1314 connection_in = packet_get_connection_in();
1315 connection_out = packet_get_connection_out();
1316 max_fd = MAX(connection_in, connection_out);
1317 if (muxserver_sock != -1)
1318 max_fd = MAX(max_fd, muxserver_sock);
1321 /* enable nonblocking unless tty */
1322 if (!isatty(fileno(stdin)))
1323 set_nonblock(fileno(stdin));
1324 if (!isatty(fileno(stdout)))
1325 set_nonblock(fileno(stdout));
1326 if (!isatty(fileno(stderr)))
1327 set_nonblock(fileno(stderr));
1328 max_fd = MAX(max_fd, fileno(stdin));
1329 max_fd = MAX(max_fd, fileno(stdout));
1330 max_fd = MAX(max_fd, fileno(stderr));
1336 escape_char1 = escape_char_arg;
1338 /* Initialize buffers. */
1339 buffer_init(&stdin_buffer);
1340 buffer_init(&stdout_buffer);
1341 buffer_init(&stderr_buffer);
1343 client_init_dispatch();
1346 * Set signal handlers, (e.g. to restore non-blocking mode)
1347 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1349 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1350 signal(SIGHUP, signal_handler);
1351 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1352 signal(SIGINT, signal_handler);
1353 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1354 signal(SIGQUIT, signal_handler);
1355 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1356 signal(SIGTERM, signal_handler);
1357 signal(SIGWINCH, window_change_handler);
1363 session_ident = ssh2_chan_id;
1364 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
1365 channel_register_filter(session_ident,
1366 client_simple_escape_filter, NULL,
1367 client_filter_cleanup,
1368 client_new_escape_filter_ctx(escape_char_arg));
1369 if (session_ident != -1)
1370 channel_register_cleanup(session_ident,
1371 client_channel_closed, 0);
1373 /* Check if we should immediately send eof on stdin. */
1374 client_check_initial_eof_on_stdin();
1377 /* Main loop of the client for the interactive session mode. */
1378 while (!quit_pending) {
1380 /* Process buffered packets sent by the server. */
1381 client_process_buffered_input_packets();
1383 if (compat20 && session_closed && !channel_still_open())
1386 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1389 debug("rekeying in progress");
1392 * Make packets of buffered stdin data, and buffer
1393 * them for sending to the server.
1396 client_make_packets_from_stdin_data();
1399 * Make packets from buffered channel data, and
1400 * enqueue them for sending to the server.
1402 if (packet_not_very_much_data_to_write())
1403 channel_output_poll();
1406 * Check if the window size has changed, and buffer a
1407 * message about it to the server if so.
1409 client_check_window_change();
1415 * Wait until we have something to do (something becomes
1416 * available on one of the descriptors).
1419 client_wait_until_can_do_something(&readset, &writeset,
1420 &max_fd2, &nalloc, rekeying);
1425 /* Do channel operations unless rekeying in progress. */
1427 channel_after_select(readset, writeset);
1428 if (need_rekeying || packet_need_rekeying()) {
1429 debug("need rekeying");
1431 kex_send_kexinit(xxx_kex);
1436 /* Buffer input from the connection. */
1437 client_process_net_input(readset);
1439 /* Accept control connections. */
1440 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1441 if (muxserver_accept_control())
1449 /* Buffer data from stdin */
1450 client_process_input(readset);
1452 * Process output to stdout and stderr. Output to
1453 * the connection is processed elsewhere (above).
1455 client_process_output(writeset);
1459 * Send as much buffered packet data as possible to the
1462 if (FD_ISSET(connection_out, writeset))
1463 packet_write_poll();
1470 /* Terminate the session. */
1472 /* Stop watching for window change. */
1473 signal(SIGWINCH, SIG_DFL);
1480 /* restore blocking io */
1481 if (!isatty(fileno(stdin)))
1482 unset_nonblock(fileno(stdin));
1483 if (!isatty(fileno(stdout)))
1484 unset_nonblock(fileno(stdout));
1485 if (!isatty(fileno(stderr)))
1486 unset_nonblock(fileno(stderr));
1489 * If there was no shell or command requested, there will be no remote
1490 * exit status to be returned. In that case, clear error code if the
1491 * connection was deliberately terminated at this end.
1493 if (no_shell_flag && received_signal == SIGTERM) {
1494 received_signal = 0;
1498 if (received_signal)
1499 fatal("Killed by signal %d.", (int) received_signal);
1502 * In interactive mode (with pseudo tty) display a message indicating
1503 * that the connection has been closed.
1505 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1506 snprintf(buf, sizeof buf,
1507 "Connection to %.64s closed.\r\n", host);
1508 buffer_append(&stderr_buffer, buf, strlen(buf));
1511 /* Output any buffered data for stdout. */
1512 while (buffer_len(&stdout_buffer) > 0) {
1513 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1514 buffer_len(&stdout_buffer));
1516 error("Write failed flushing stdout buffer.");
1519 buffer_consume(&stdout_buffer, len);
1520 stdout_bytes += len;
1523 /* Output any buffered data for stderr. */
1524 while (buffer_len(&stderr_buffer) > 0) {
1525 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1526 buffer_len(&stderr_buffer));
1528 error("Write failed flushing stderr buffer.");
1531 buffer_consume(&stderr_buffer, len);
1532 stderr_bytes += len;
1535 /* Clear and free any buffers. */
1536 memset(buf, 0, sizeof(buf));
1537 buffer_free(&stdin_buffer);
1538 buffer_free(&stdout_buffer);
1539 buffer_free(&stderr_buffer);
1541 /* Report bytes transferred, and transfer rates. */
1542 total_time = get_current_time() - start_time;
1543 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f "
1544 "seconds", stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1546 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1547 stdin_bytes / total_time, stdout_bytes / total_time,
1548 stderr_bytes / total_time);
1550 /* Return the exit status of the program. */
1551 debug("Exit status %d", exit_status);
1558 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1561 char *data = packet_get_string(&data_len);
1563 buffer_append(&stdout_buffer, data, data_len);
1564 memset(data, 0, data_len);
1568 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1571 char *data = packet_get_string(&data_len);
1573 buffer_append(&stderr_buffer, data, data_len);
1574 memset(data, 0, data_len);
1578 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1580 exit_status = packet_get_int();
1582 /* Acknowledge the exit. */
1583 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1586 * Must wait for packet to be sent since we are
1589 packet_write_wait();
1590 /* Flag that we want to exit. */
1594 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1597 int remote_id, sock;
1599 /* Read the remote channel number from the message. */
1600 remote_id = packet_get_int();
1604 * Get a connection to the local authentication agent (this may again
1607 sock = ssh_get_authentication_socket();
1610 * If we could not connect the agent, send an error message back to
1611 * the server. This should never happen unless the agent dies,
1612 * because authentication forwarding is only enabled if we have an
1616 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1617 -1, 0, 0, 0, "authentication agent connection", 1);
1618 c->remote_id = remote_id;
1622 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1623 packet_put_int(remote_id);
1625 /* Send a confirmation to the remote host. */
1626 debug("Forwarding authentication connection.");
1627 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1628 packet_put_int(remote_id);
1629 packet_put_int(c->self);
1635 client_request_forwarded_tcpip(const char *request_type, int rchan)
1638 char *listen_address, *originator_address;
1639 int listen_port, originator_port;
1641 /* Get rest of the packet */
1642 listen_address = packet_get_string(NULL);
1643 listen_port = packet_get_int();
1644 originator_address = packet_get_string(NULL);
1645 originator_port = packet_get_int();
1648 debug("client_request_forwarded_tcpip: listen %s port %d, "
1649 "originator %s port %d", listen_address, listen_port,
1650 originator_address, originator_port);
1652 c = channel_connect_by_listen_address(listen_port,
1653 "forwarded-tcpip", originator_address);
1655 xfree(originator_address);
1656 xfree(listen_address);
1661 client_request_x11(const char *request_type, int rchan)
1665 int originator_port;
1668 if (!options.forward_x11) {
1669 error("Warning: ssh server tried X11 forwarding.");
1670 error("Warning: this is probably a break-in attempt by a "
1671 "malicious server.");
1674 originator = packet_get_string(NULL);
1675 if (datafellows & SSH_BUG_X11FWD) {
1676 debug2("buggy server: x11 request w/o originator_port");
1677 originator_port = 0;
1679 originator_port = packet_get_int();
1682 /* XXX check permission */
1683 debug("client_request_x11: request from %s %d", originator,
1686 sock = x11_connect_display();
1689 c = channel_new("x11",
1690 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1691 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1697 client_request_agent(const char *request_type, int rchan)
1702 if (!options.forward_agent) {
1703 error("Warning: ssh server tried agent forwarding.");
1704 error("Warning: this is probably a break-in attempt by a "
1705 "malicious server.");
1708 sock = ssh_get_authentication_socket();
1711 c = channel_new("authentication agent connection",
1712 SSH_CHANNEL_OPEN, sock, sock, -1,
1713 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1714 "authentication agent connection", 1);
1720 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1725 if (tun_mode == SSH_TUNMODE_NO)
1729 error("Tunnel forwarding is not support for protocol 1");
1733 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1735 /* Open local tunnel device */
1736 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1737 error("Tunnel device open failed.");
1741 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1742 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1745 #if defined(SSH_TUN_FILTER)
1746 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1747 channel_register_filter(c->self, sys_tun_infilter,
1748 sys_tun_outfilter, NULL, NULL);
1751 packet_start(SSH2_MSG_CHANNEL_OPEN);
1752 packet_put_cstring("tun@openssh.com");
1753 packet_put_int(c->self);
1754 packet_put_int(c->local_window_max);
1755 packet_put_int(c->local_maxpacket);
1756 packet_put_int(tun_mode);
1757 packet_put_int(remote_tun);
1763 /* XXXX move to generic input handler */
1765 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1770 u_int rmaxpack, rwindow, len;
1772 ctype = packet_get_string(&len);
1773 rchan = packet_get_int();
1774 rwindow = packet_get_int();
1775 rmaxpack = packet_get_int();
1777 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1778 ctype, rchan, rwindow, rmaxpack);
1780 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1781 c = client_request_forwarded_tcpip(ctype, rchan);
1782 } else if (strcmp(ctype, "x11") == 0) {
1783 c = client_request_x11(ctype, rchan);
1784 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1785 c = client_request_agent(ctype, rchan);
1787 /* XXX duplicate : */
1789 debug("confirm %s", ctype);
1790 c->remote_id = rchan;
1791 c->remote_window = rwindow;
1792 c->remote_maxpacket = rmaxpack;
1793 if (c->type != SSH_CHANNEL_CONNECTING) {
1794 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1795 packet_put_int(c->remote_id);
1796 packet_put_int(c->self);
1797 packet_put_int(c->local_window);
1798 packet_put_int(c->local_maxpacket);
1802 debug("failure %s", ctype);
1803 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1804 packet_put_int(rchan);
1805 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1806 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1807 packet_put_cstring("open failed");
1808 packet_put_cstring("");
1815 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1818 int exitval, id, reply, success = 0;
1821 id = packet_get_int();
1822 rtype = packet_get_string(NULL);
1823 reply = packet_get_char();
1825 debug("client_input_channel_req: channel %d rtype %s reply %d",
1829 error("client_input_channel_req: request for channel -1");
1830 } else if ((c = channel_lookup(id)) == NULL) {
1831 error("client_input_channel_req: channel %d: "
1832 "unknown channel", id);
1833 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1836 } else if (strcmp(rtype, "exit-status") == 0) {
1837 exitval = packet_get_int();
1838 if (id == session_ident) {
1840 exit_status = exitval;
1841 } else if (c->ctl_fd == -1) {
1842 error("client_input_channel_req: unexpected channel %d",
1845 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1851 packet_start(success ?
1852 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1859 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1865 rtype = packet_get_string(NULL);
1866 want_reply = packet_get_char();
1867 debug("client_input_global_request: rtype %s want_reply %d",
1870 packet_start(success ?
1871 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1873 packet_write_wait();
1879 client_session2_setup(int id, int want_tty, int want_subsystem,
1880 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1885 debug2("%s: id %d", __func__, id);
1887 if ((c = channel_lookup(id)) == NULL)
1888 fatal("client_session2_setup: channel %d: unknown channel", id);
1893 /* Store window size in the packet. */
1894 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1895 memset(&ws, 0, sizeof(ws));
1897 channel_request_start(id, "pty-req", 1);
1898 client_expect_confirm(id, "PTY allocation", 0);
1899 packet_put_cstring(term != NULL ? term : "");
1900 packet_put_int((u_int)ws.ws_col);
1901 packet_put_int((u_int)ws.ws_row);
1902 packet_put_int((u_int)ws.ws_xpixel);
1903 packet_put_int((u_int)ws.ws_ypixel);
1905 tiop = get_saved_tio();
1906 tty_make_modes(-1, tiop);
1908 /* XXX wait for reply */
1912 /* Transfer any environment variables from client to server */
1913 if (options.num_send_env != 0 && env != NULL) {
1917 debug("Sending environment.");
1918 for (i = 0; env[i] != NULL; i++) {
1920 name = xstrdup(env[i]);
1921 if ((val = strchr(name, '=')) == NULL) {
1928 for (j = 0; j < options.num_send_env; j++) {
1929 if (match_pattern(name, options.send_env[j])) {
1935 debug3("Ignored env %s", name);
1940 debug("Sending env %s = %s", name, val);
1941 channel_request_start(id, "env", 0);
1942 packet_put_cstring(name);
1943 packet_put_cstring(val);
1949 len = buffer_len(cmd);
1953 if (want_subsystem) {
1954 debug("Sending subsystem: %.*s",
1955 len, (u_char*)buffer_ptr(cmd));
1956 channel_request_start(id, "subsystem", 1);
1957 client_expect_confirm(id, "subsystem", 1);
1959 debug("Sending command: %.*s",
1960 len, (u_char*)buffer_ptr(cmd));
1961 channel_request_start(id, "exec", 1);
1962 client_expect_confirm(id, "exec", 1);
1964 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1967 channel_request_start(id, "shell", 1);
1968 client_expect_confirm(id, "shell", 1);
1974 client_init_dispatch_20(void)
1976 dispatch_init(&dispatch_protocol_error);
1978 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1979 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1980 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1981 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1982 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1983 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1984 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1985 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1986 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1987 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
1988 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1989 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1992 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1994 /* global request reply messages */
1995 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1996 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2000 client_init_dispatch_13(void)
2002 dispatch_init(NULL);
2003 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2004 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2005 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2006 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2007 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2008 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2009 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2010 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2011 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2013 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2014 &client_input_agent_open : &deny_input_open);
2015 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2016 &x11_input_open : &deny_input_open);
2020 client_init_dispatch_15(void)
2022 client_init_dispatch_13();
2023 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2024 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2028 client_init_dispatch(void)
2031 client_init_dispatch_20();
2033 client_init_dispatch_13();
2035 client_init_dispatch_15();
2038 /* client specific fatal cleanup */
2043 leave_non_blocking();
2044 if (options.control_path != NULL && muxserver_sock != -1)
2045 unlink(options.control_path);