1 /* $OpenBSD: clientloop.c,v 1.166 2006/07/08 21:47:12 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 #ifdef HAVE_SYS_STAT_H
66 # include <sys/stat.h>
68 #include <sys/socket.h>
69 #include <sys/ioctl.h>
93 #include "clientloop.h"
94 #include "sshconnect.h"
99 #include "monitor_fdpass.h"
104 extern Options options;
106 /* Flag indicating that stdin should be redirected from /dev/null. */
107 extern int stdin_null_flag;
109 /* Flag indicating that no shell has been requested */
110 extern int no_shell_flag;
113 extern int control_fd;
116 * Name of the host we are connecting to. This is the name given on the
117 * command line, or the HostName specified for the user-supplied name in a
118 * configuration file.
123 * Flag to indicate that we have received a window change signal which has
124 * not yet been processed. This will cause a message indicating the new
125 * window size to be sent to the server a little later. This is volatile
126 * because this is updated in a signal handler.
128 static volatile sig_atomic_t received_window_change_signal = 0;
129 static volatile sig_atomic_t received_signal = 0;
131 /* Flag indicating whether the user's terminal is in non-blocking mode. */
132 static int in_non_blocking_mode = 0;
134 /* Common data for the client loop code. */
135 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
136 static int escape_char; /* Escape character. */
137 static int escape_pending; /* Last character was the escape character */
138 static int last_was_cr; /* Last character was a newline. */
139 static int exit_status; /* Used to store the exit status of the command. */
140 static int stdin_eof; /* EOF has been encountered on standard error. */
141 static Buffer stdin_buffer; /* Buffer for stdin data. */
142 static Buffer stdout_buffer; /* Buffer for stdout data. */
143 static Buffer stderr_buffer; /* Buffer for stderr data. */
144 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
145 static u_int buffer_high;/* Soft max buffer size. */
146 static int connection_in; /* Connection to server (input). */
147 static int connection_out; /* Connection to server (output). */
148 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
149 static int session_closed = 0; /* In SSH2: login session closed. */
150 static int server_alive_timeouts = 0;
152 static void client_init_dispatch(void);
153 int session_ident = -1;
169 void ssh_process_session2_setup(int, int, int, Buffer *);
171 /* Restores stdin to blocking mode. */
174 leave_non_blocking(void)
176 if (in_non_blocking_mode) {
177 unset_nonblock(fileno(stdin));
178 in_non_blocking_mode = 0;
182 /* Puts stdin terminal in non-blocking mode. */
185 enter_non_blocking(void)
187 in_non_blocking_mode = 1;
188 set_nonblock(fileno(stdin));
192 * Signal handler for the window change signal (SIGWINCH). This just sets a
193 * flag indicating that the window has changed.
197 window_change_handler(int sig)
199 received_window_change_signal = 1;
200 signal(SIGWINCH, window_change_handler);
204 * Signal handler for signals that cause the program to terminate. These
205 * signals must be trapped to restore terminal modes.
209 signal_handler(int sig)
211 received_signal = sig;
216 * Returns current time in seconds from Jan 1, 1970 with the maximum
217 * available resolution.
221 get_current_time(void)
224 gettimeofday(&tv, NULL);
225 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
228 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
230 client_x11_get_proto(const char *display, const char *xauth_path,
231 u_int trusted, char **_proto, char **_data)
236 static char proto[512], data[512];
238 int got_data = 0, generated = 0, do_unlink = 0, i;
239 char *xauthdir, *xauthfile;
242 xauthdir = xauthfile = NULL;
245 proto[0] = data[0] = '\0';
247 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
248 debug("No xauth program.");
250 if (display == NULL) {
251 debug("x11_get_proto: DISPLAY not set");
255 * Handle FamilyLocal case where $DISPLAY does
256 * not match an authorization entry. For this we
257 * just try "xauth list unix:displaynum.screennum".
258 * XXX: "localhost" match to determine FamilyLocal
261 if (strncmp(display, "localhost:", 10) == 0) {
262 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
267 xauthdir = xmalloc(MAXPATHLEN);
268 xauthfile = xmalloc(MAXPATHLEN);
269 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
270 if (mkdtemp(xauthdir) != NULL) {
272 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
274 snprintf(cmd, sizeof(cmd),
275 "%s -f %s generate %s " SSH_X11_PROTO
276 " untrusted timeout 1200 2>" _PATH_DEVNULL,
277 xauth_path, xauthfile, display);
278 debug2("x11_get_proto: %s", cmd);
279 if (system(cmd) == 0)
283 snprintf(cmd, sizeof(cmd),
284 "%s %s%s list %s 2>" _PATH_DEVNULL,
286 generated ? "-f " : "" ,
287 generated ? xauthfile : "",
289 debug2("x11_get_proto: %s", cmd);
291 if (f && fgets(line, sizeof(line), f) &&
292 sscanf(line, "%*s %511s %511s", proto, data) == 2)
308 * If we didn't get authentication data, just make up some
309 * data. The forwarding code will check the validity of the
310 * response anyway, and substitute this data. The X11
311 * server, however, will ignore this fake data and use
312 * whatever authentication mechanisms it was using otherwise
313 * for the local connection.
318 logit("Warning: No xauth data; "
319 "using fake authentication data for X11 forwarding.");
320 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
321 for (i = 0; i < 16; i++) {
324 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
332 * This is called when the interactive is entered. This checks if there is
333 * an EOF coming on stdin. We must check this explicitly, as select() does
334 * not appear to wake up when redirecting from /dev/null.
338 client_check_initial_eof_on_stdin(void)
344 * If standard input is to be "redirected from /dev/null", we simply
345 * mark that we have seen an EOF and send an EOF message to the
346 * server. Otherwise, we try to read a single character; it appears
347 * that for some files, such /dev/null, select() never wakes up for
348 * read for this descriptor, which means that we never get EOF. This
349 * way we will get the EOF if stdin comes from /dev/null or similar.
351 if (stdin_null_flag) {
352 /* Fake EOF on stdin. */
353 debug("Sending eof.");
355 packet_start(SSH_CMSG_EOF);
358 enter_non_blocking();
360 /* Check for immediate EOF on stdin. */
361 len = read(fileno(stdin), buf, 1);
363 /* EOF. Record that we have seen it and send EOF to server. */
364 debug("Sending eof.");
366 packet_start(SSH_CMSG_EOF);
368 } else if (len > 0) {
370 * Got data. We must store the data in the buffer,
371 * and also process it as an escape character if
374 if ((u_char) buf[0] == escape_char)
377 buffer_append(&stdin_buffer, buf, 1);
379 leave_non_blocking();
385 * Make packets from buffered stdin data, and buffer them for sending to the
390 client_make_packets_from_stdin_data(void)
394 /* Send buffered stdin data to the server. */
395 while (buffer_len(&stdin_buffer) > 0 &&
396 packet_not_very_much_data_to_write()) {
397 len = buffer_len(&stdin_buffer);
398 /* Keep the packets at reasonable size. */
399 if (len > packet_get_maxsize())
400 len = packet_get_maxsize();
401 packet_start(SSH_CMSG_STDIN_DATA);
402 packet_put_string(buffer_ptr(&stdin_buffer), len);
404 buffer_consume(&stdin_buffer, len);
406 /* If we have a pending EOF, send it now. */
407 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
408 packet_start(SSH_CMSG_EOF);
415 * Checks if the client window has changed, and sends a packet about it to
416 * the server if so. The actual change is detected elsewhere (by a software
417 * interrupt on Unix); this just checks the flag and sends a message if
422 client_check_window_change(void)
426 if (! received_window_change_signal)
429 received_window_change_signal = 0;
431 debug2("client_check_window_change: changed");
434 channel_send_window_changes();
436 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
438 packet_start(SSH_CMSG_WINDOW_SIZE);
439 packet_put_int((u_int)ws.ws_row);
440 packet_put_int((u_int)ws.ws_col);
441 packet_put_int((u_int)ws.ws_xpixel);
442 packet_put_int((u_int)ws.ws_ypixel);
448 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
450 server_alive_timeouts = 0;
451 client_global_request_reply_fwd(type, seq, ctxt);
455 server_alive_check(void)
457 if (++server_alive_timeouts > options.server_alive_count_max)
458 packet_disconnect("Timeout, server not responding.");
459 packet_start(SSH2_MSG_GLOBAL_REQUEST);
460 packet_put_cstring("keepalive@openssh.com");
461 packet_put_char(1); /* boolean: want reply */
466 * Waits until the client can do something (some data becomes available on
467 * one of the file descriptors).
470 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
471 int *maxfdp, u_int *nallocp, int rekeying)
473 struct timeval tv, *tvp;
476 /* Add any selections by the channel mechanism. */
477 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
480 /* Read from the connection, unless our buffers are full. */
481 if (buffer_len(&stdout_buffer) < buffer_high &&
482 buffer_len(&stderr_buffer) < buffer_high &&
483 channel_not_very_much_buffered_data())
484 FD_SET(connection_in, *readsetp);
486 * Read from stdin, unless we have seen EOF or have very much
487 * buffered data to send to the server.
489 if (!stdin_eof && packet_not_very_much_data_to_write())
490 FD_SET(fileno(stdin), *readsetp);
492 /* Select stdout/stderr if have data in buffer. */
493 if (buffer_len(&stdout_buffer) > 0)
494 FD_SET(fileno(stdout), *writesetp);
495 if (buffer_len(&stderr_buffer) > 0)
496 FD_SET(fileno(stderr), *writesetp);
498 /* channel_prepare_select could have closed the last channel */
499 if (session_closed && !channel_still_open() &&
500 !packet_have_data_to_write()) {
501 /* clear mask since we did not call select() */
502 memset(*readsetp, 0, *nallocp);
503 memset(*writesetp, 0, *nallocp);
506 FD_SET(connection_in, *readsetp);
510 /* Select server connection if have data to write to the server. */
511 if (packet_have_data_to_write())
512 FD_SET(connection_out, *writesetp);
514 if (control_fd != -1)
515 FD_SET(control_fd, *readsetp);
518 * Wait for something to happen. This will suspend the process until
519 * some selected descriptor can be read, written, or has some other
523 if (options.server_alive_interval == 0 || !compat20)
526 tv.tv_sec = options.server_alive_interval;
530 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
535 * We have to clear the select masks, because we return.
536 * We have to return, because the mainloop checks for the flags
537 * set by the signal handlers.
539 memset(*readsetp, 0, *nallocp);
540 memset(*writesetp, 0, *nallocp);
544 /* Note: we might still have data in the buffers. */
545 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
546 buffer_append(&stderr_buffer, buf, strlen(buf));
549 server_alive_check();
553 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
555 /* Flush stdout and stderr buffers. */
556 if (buffer_len(bout) > 0)
557 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
558 if (buffer_len(berr) > 0)
559 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
564 * Free (and clear) the buffer to reduce the amount of data that gets
571 /* Send the suspend signal to the program itself. */
572 kill(getpid(), SIGTSTP);
574 /* Reset window sizes in case they have changed */
575 received_window_change_signal = 1;
577 /* OK, we have been continued by the user. Reinitialize buffers. */
586 client_process_net_input(fd_set *readset)
592 * Read input from the server, and add any such data to the buffer of
593 * the packet subsystem.
595 if (FD_ISSET(connection_in, readset)) {
596 /* Read as much as possible. */
597 len = read(connection_in, buf, sizeof(buf));
599 /* Received EOF. The remote host has closed the connection. */
600 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
602 buffer_append(&stderr_buffer, buf, strlen(buf));
607 * There is a kernel bug on Solaris that causes select to
608 * sometimes wake up even though there is no data available.
610 if (len < 0 && (errno == EAGAIN || errno == EINTR))
614 /* An error has encountered. Perhaps there is a network problem. */
615 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
616 host, strerror(errno));
617 buffer_append(&stderr_buffer, buf, strlen(buf));
621 packet_process_incoming(buf, len);
626 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
631 id = packet_get_int();
634 if ((c = channel_lookup(id)) == NULL) {
635 error("%s: no channel for id %d", __func__, id);
639 if (type == SSH2_MSG_CHANNEL_SUCCESS)
640 debug2("Request suceeded on channel %d", id);
641 else if (type == SSH2_MSG_CHANNEL_FAILURE) {
642 error("Request failed on channel %d", id);
648 client_extra_session2_setup(int id, void *arg)
650 struct confirm_ctx *cctx = arg;
656 fatal("%s: cctx == NULL", __func__);
657 if ((c = channel_lookup(id)) == NULL)
658 fatal("%s: no channel for id %d", __func__, id);
660 display = getenv("DISPLAY");
661 if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
663 /* Get reasonable local authentication information. */
664 client_x11_get_proto(display, options.xauth_location,
665 options.forward_x11_trusted, &proto, &data);
666 /* Request forwarding with authentication spoofing. */
667 debug("Requesting X11 forwarding with authentication spoofing.");
668 x11_request_forwarding_with_spoofing(id, display, proto, data);
669 /* XXX wait for reply */
672 if (cctx->want_agent_fwd && options.forward_agent) {
673 debug("Requesting authentication agent forwarding.");
674 channel_request_start(id, "auth-agent-req@openssh.com", 0);
678 client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
679 cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
680 client_subsystem_reply);
682 c->confirm_ctx = NULL;
683 buffer_free(&cctx->cmd);
685 if (cctx->env != NULL) {
686 for (i = 0; cctx->env[i] != NULL; i++)
694 client_process_control(fd_set *readset)
698 int client_fd, new_fd[3], ver, allowed;
700 struct sockaddr_storage addr;
701 struct confirm_ctx *cctx;
703 u_int i, len, env_len, command, flags;
708 * Accept connection on control socket
710 if (control_fd == -1 || !FD_ISSET(control_fd, readset))
713 memset(&addr, 0, sizeof(addr));
714 addrlen = sizeof(addr);
715 if ((client_fd = accept(control_fd,
716 (struct sockaddr*)&addr, &addrlen)) == -1) {
717 error("%s accept: %s", __func__, strerror(errno));
721 if (getpeereid(client_fd, &euid, &egid) < 0) {
722 error("%s getpeereid failed: %s", __func__, strerror(errno));
726 if ((euid != 0) && (getuid() != euid)) {
727 error("control mode uid mismatch: peer euid %u != uid %u",
728 (u_int) euid, (u_int) getuid());
733 unset_nonblock(client_fd);
737 if (ssh_msg_recv(client_fd, &m) == -1) {
738 error("%s: client msg_recv failed", __func__);
743 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
744 error("%s: wrong client version %d", __func__, ver);
751 command = buffer_get_int(&m);
752 flags = buffer_get_int(&m);
757 case SSHMUX_COMMAND_OPEN:
758 if (options.control_master == SSHCTL_MASTER_ASK ||
759 options.control_master == SSHCTL_MASTER_AUTO_ASK)
760 allowed = ask_permission("Allow shared connection "
764 case SSHMUX_COMMAND_TERMINATE:
765 if (options.control_master == SSHCTL_MASTER_ASK ||
766 options.control_master == SSHCTL_MASTER_AUTO_ASK)
767 allowed = ask_permission("Terminate shared connection "
772 case SSHMUX_COMMAND_ALIVE_CHECK:
773 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
775 buffer_put_int(&m, allowed);
776 buffer_put_int(&m, getpid());
777 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
778 error("%s: client msg_send failed", __func__);
787 error("Unsupported command %d", command);
793 /* Reply for SSHMUX_COMMAND_OPEN */
795 buffer_put_int(&m, allowed);
796 buffer_put_int(&m, getpid());
797 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
798 error("%s: client msg_send failed", __func__);
805 error("Refused control connection");
812 if (ssh_msg_recv(client_fd, &m) == -1) {
813 error("%s: client msg_recv failed", __func__);
818 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
819 error("%s: wrong client version %d", __func__, ver);
825 cctx = xcalloc(1, sizeof(*cctx));
826 cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
827 cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
828 cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
829 cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
830 cctx->term = buffer_get_string(&m, &len);
832 cmd = buffer_get_string(&m, &len);
833 buffer_init(&cctx->cmd);
834 buffer_append(&cctx->cmd, cmd, strlen(cmd));
836 env_len = buffer_get_int(&m);
837 env_len = MIN(env_len, 4096);
838 debug3("%s: receiving %d env vars", __func__, env_len);
840 cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
841 for (i = 0; i < env_len; i++)
842 cctx->env[i] = buffer_get_string(&m, &len);
846 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
847 cctx->want_tty, cctx->want_subsys, cmd);
850 /* Gather fds from client */
851 new_fd[0] = mm_receive_fd(client_fd);
852 new_fd[1] = mm_receive_fd(client_fd);
853 new_fd[2] = mm_receive_fd(client_fd);
855 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
856 new_fd[0], new_fd[1], new_fd[2]);
858 /* Try to pick up ttymodes from client before it goes raw */
859 if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
860 error("%s: tcgetattr: %s", __func__, strerror(errno));
862 /* This roundtrip is just for synchronisation of ttymodes */
864 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
865 error("%s: client msg_send failed", __func__);
873 for (i = 0; i < env_len; i++)
881 /* enable nonblocking unless tty */
882 if (!isatty(new_fd[0]))
883 set_nonblock(new_fd[0]);
884 if (!isatty(new_fd[1]))
885 set_nonblock(new_fd[1]);
886 if (!isatty(new_fd[2]))
887 set_nonblock(new_fd[2]);
889 set_nonblock(client_fd);
891 c = channel_new("session", SSH_CHANNEL_OPENING,
892 new_fd[0], new_fd[1], new_fd[2],
893 CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
894 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
897 c->ctl_fd = client_fd;
899 debug3("%s: channel_new: %d", __func__, c->self);
901 channel_send_open(c->self);
902 channel_register_confirm(c->self, client_extra_session2_setup, cctx);
906 process_cmdline(void)
908 void (*handler)(int);
909 char *s, *cmd, *cancel_host;
916 handler = signal(SIGINT, SIG_IGN);
917 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
920 while (*s && isspace(*s))
923 s++; /* Skip cmdline '-', if any */
927 if (*s == 'h' || *s == 'H' || *s == '?') {
929 logit(" -L[bind_address:]port:host:hostport "
930 "Request local forward");
931 logit(" -R[bind_address:]port:host:hostport "
932 "Request remote forward");
933 logit(" -KR[bind_address:]port "
934 "Cancel remote forward");
935 if (!options.permit_local_command)
938 "Execute local command");
942 if (*s == '!' && options.permit_local_command) {
952 if (*s != 'L' && *s != 'R') {
953 logit("Invalid command.");
958 if (local && delete) {
959 logit("Not supported.");
962 if ((!local || delete) && !compat20) {
963 logit("Not supported for SSH protocol version 1.");
968 while (*s && isspace(*s))
973 cancel_host = hpdelim(&s); /* may be NULL */
975 cancel_port = a2port(s);
976 cancel_host = cleanhostname(cancel_host);
978 cancel_port = a2port(cancel_host);
981 if (cancel_port == 0) {
982 logit("Bad forwarding close port");
985 channel_request_rforward_cancel(cancel_host, cancel_port);
987 if (!parse_forward(&fwd, s)) {
988 logit("Bad forwarding specification.");
992 if (channel_setup_local_fwd_listener(fwd.listen_host,
993 fwd.listen_port, fwd.connect_host,
994 fwd.connect_port, options.gateway_ports) < 0) {
995 logit("Port forwarding failed.");
999 channel_request_remote_forwarding(fwd.listen_host,
1000 fwd.listen_port, fwd.connect_host,
1004 logit("Forwarding port.");
1008 signal(SIGINT, handler);
1014 /* process the characters one by one */
1016 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1028 for (i = 0; i < (u_int)len; i++) {
1029 /* Get one character at a time. */
1032 if (escape_pending) {
1033 /* We have previously seen an escape character. */
1034 /* Clear the flag now. */
1037 /* Process the escaped character. */
1040 /* Terminate the connection. */
1041 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1042 buffer_append(berr, string, strlen(string));
1048 /* Suspend the program. */
1049 /* Print a message to that effect to the user. */
1050 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1051 buffer_append(berr, string, strlen(string));
1053 /* Restore terminal modes and suspend. */
1054 client_suspend_self(bin, bout, berr);
1056 /* We have been continued. */
1061 snprintf(string, sizeof string,
1062 "%cB\r\n", escape_char);
1063 buffer_append(berr, string,
1065 channel_request_start(session_ident,
1067 packet_put_int(1000);
1074 if (datafellows & SSH_BUG_NOREKEY)
1075 logit("Server does not support re-keying");
1083 * Detach the program (continue to serve connections,
1084 * but put in background and no more new connections).
1086 /* Restore tty modes. */
1089 /* Stop listening for new connections. */
1090 channel_stop_listening();
1092 snprintf(string, sizeof string,
1093 "%c& [backgrounded]\n", escape_char);
1094 buffer_append(berr, string, strlen(string));
1096 /* Fork into background. */
1099 error("fork: %.100s", strerror(errno));
1102 if (pid != 0) { /* This is the parent. */
1103 /* The parent just exits. */
1106 /* The child continues serving connections. */
1108 buffer_append(bin, "\004", 1);
1109 /* fake EOF on stdin */
1111 } else if (!stdin_eof) {
1113 * Sending SSH_CMSG_EOF alone does not always appear
1114 * to be enough. So we try to send an EOF character
1117 packet_start(SSH_CMSG_STDIN_DATA);
1118 packet_put_string("\004", 1);
1122 if (buffer_len(bin) == 0) {
1123 packet_start(SSH_CMSG_EOF);
1130 snprintf(string, sizeof string,
1132 Supported escape sequences:\r\n\
1133 %c. - terminate connection\r\n\
1134 %cB - send a BREAK to the remote system\r\n\
1135 %cC - open a command line\r\n\
1136 %cR - Request rekey (SSH protocol 2 only)\r\n\
1137 %c^Z - suspend ssh\r\n\
1138 %c# - list forwarded connections\r\n\
1139 %c& - background ssh (when waiting for connections to terminate)\r\n\
1140 %c? - this message\r\n\
1141 %c%c - send the escape character by typing it twice\r\n\
1142 (Note that escapes are only recognized immediately after newline.)\r\n",
1143 escape_char, escape_char, escape_char, escape_char,
1144 escape_char, escape_char, escape_char, escape_char,
1145 escape_char, escape_char, escape_char);
1146 buffer_append(berr, string, strlen(string));
1150 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1151 buffer_append(berr, string, strlen(string));
1152 s = channel_open_message();
1153 buffer_append(berr, s, strlen(s));
1162 if (ch != escape_char) {
1163 buffer_put_char(bin, escape_char);
1166 /* Escaped characters fall through here */
1171 * The previous character was not an escape char. Check if this
1174 if (last_was_cr && ch == escape_char) {
1175 /* It is. Set the flag and continue to next character. */
1182 * Normal character. Record whether it was a newline,
1183 * and append it to the buffer.
1185 last_was_cr = (ch == '\r' || ch == '\n');
1186 buffer_put_char(bin, ch);
1193 client_process_input(fd_set *readset)
1198 /* Read input from stdin. */
1199 if (FD_ISSET(fileno(stdin), readset)) {
1200 /* Read as much as possible. */
1201 len = read(fileno(stdin), buf, sizeof(buf));
1202 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1203 return; /* we'll try again later */
1206 * Received EOF or error. They are treated
1207 * similarly, except that an error message is printed
1208 * if it was an error condition.
1211 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1212 buffer_append(&stderr_buffer, buf, strlen(buf));
1214 /* Mark that we have seen EOF. */
1217 * Send an EOF message to the server unless there is
1218 * data in the buffer. If there is data in the
1219 * buffer, no message will be sent now. Code
1220 * elsewhere will send the EOF when the buffer
1221 * becomes empty if stdin_eof is set.
1223 if (buffer_len(&stdin_buffer) == 0) {
1224 packet_start(SSH_CMSG_EOF);
1227 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1229 * Normal successful read, and no escape character.
1230 * Just append the data to buffer.
1232 buffer_append(&stdin_buffer, buf, len);
1235 * Normal, successful read. But we have an escape character
1236 * and have to process the characters one by one.
1238 if (process_escapes(&stdin_buffer, &stdout_buffer,
1239 &stderr_buffer, buf, len) == -1)
1246 client_process_output(fd_set *writeset)
1251 /* Write buffered output to stdout. */
1252 if (FD_ISSET(fileno(stdout), writeset)) {
1253 /* Write as much data as possible. */
1254 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1255 buffer_len(&stdout_buffer));
1257 if (errno == EINTR || errno == EAGAIN)
1261 * An error or EOF was encountered. Put an
1262 * error message to stderr buffer.
1264 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1265 buffer_append(&stderr_buffer, buf, strlen(buf));
1270 /* Consume printed data from the buffer. */
1271 buffer_consume(&stdout_buffer, len);
1272 stdout_bytes += len;
1274 /* Write buffered output to stderr. */
1275 if (FD_ISSET(fileno(stderr), writeset)) {
1276 /* Write as much data as possible. */
1277 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1278 buffer_len(&stderr_buffer));
1280 if (errno == EINTR || errno == EAGAIN)
1283 /* EOF or error, but can't even print error message. */
1288 /* Consume printed characters from the buffer. */
1289 buffer_consume(&stderr_buffer, len);
1290 stderr_bytes += len;
1295 * Get packets from the connection input buffer, and process them as long as
1296 * there are packets available.
1298 * Any unknown packets received during the actual
1299 * session cause the session to terminate. This is
1300 * intended to make debugging easier since no
1301 * confirmations are sent. Any compatible protocol
1302 * extensions must be negotiated during the
1303 * preparatory phase.
1307 client_process_buffered_input_packets(void)
1309 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1312 /* scan buf[] for '~' before sending data to the peer */
1315 simple_escape_filter(Channel *c, char *buf, int len)
1317 /* XXX we assume c->extended is writeable */
1318 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1322 client_channel_closed(int id, void *arg)
1324 channel_cancel_cleanup(id);
1330 * Implements the interactive session with the server. This is called after
1331 * the user has been authenticated, and a command has been started on the
1332 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1333 * used as an escape character for terminating or suspending the session.
1337 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1339 fd_set *readset = NULL, *writeset = NULL;
1340 double start_time, total_time;
1341 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1345 debug("Entering interactive session.");
1347 start_time = get_current_time();
1349 /* Initialize variables. */
1354 buffer_high = 64 * 1024;
1355 connection_in = packet_get_connection_in();
1356 connection_out = packet_get_connection_out();
1357 max_fd = MAX(connection_in, connection_out);
1358 if (control_fd != -1)
1359 max_fd = MAX(max_fd, control_fd);
1362 /* enable nonblocking unless tty */
1363 if (!isatty(fileno(stdin)))
1364 set_nonblock(fileno(stdin));
1365 if (!isatty(fileno(stdout)))
1366 set_nonblock(fileno(stdout));
1367 if (!isatty(fileno(stderr)))
1368 set_nonblock(fileno(stderr));
1369 max_fd = MAX(max_fd, fileno(stdin));
1370 max_fd = MAX(max_fd, fileno(stdout));
1371 max_fd = MAX(max_fd, fileno(stderr));
1377 escape_char = escape_char_arg;
1379 /* Initialize buffers. */
1380 buffer_init(&stdin_buffer);
1381 buffer_init(&stdout_buffer);
1382 buffer_init(&stderr_buffer);
1384 client_init_dispatch();
1387 * Set signal handlers, (e.g. to restore non-blocking mode)
1388 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1390 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1391 signal(SIGHUP, signal_handler);
1392 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1393 signal(SIGINT, signal_handler);
1394 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1395 signal(SIGQUIT, signal_handler);
1396 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1397 signal(SIGTERM, signal_handler);
1398 signal(SIGWINCH, window_change_handler);
1404 session_ident = ssh2_chan_id;
1405 if (escape_char != SSH_ESCAPECHAR_NONE)
1406 channel_register_filter(session_ident,
1407 simple_escape_filter, NULL);
1408 if (session_ident != -1)
1409 channel_register_cleanup(session_ident,
1410 client_channel_closed, 0);
1412 /* Check if we should immediately send eof on stdin. */
1413 client_check_initial_eof_on_stdin();
1416 /* Main loop of the client for the interactive session mode. */
1417 while (!quit_pending) {
1419 /* Process buffered packets sent by the server. */
1420 client_process_buffered_input_packets();
1422 if (compat20 && session_closed && !channel_still_open())
1425 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1428 debug("rekeying in progress");
1431 * Make packets of buffered stdin data, and buffer
1432 * them for sending to the server.
1435 client_make_packets_from_stdin_data();
1438 * Make packets from buffered channel data, and
1439 * enqueue them for sending to the server.
1441 if (packet_not_very_much_data_to_write())
1442 channel_output_poll();
1445 * Check if the window size has changed, and buffer a
1446 * message about it to the server if so.
1448 client_check_window_change();
1454 * Wait until we have something to do (something becomes
1455 * available on one of the descriptors).
1458 client_wait_until_can_do_something(&readset, &writeset,
1459 &max_fd2, &nalloc, rekeying);
1464 /* Do channel operations unless rekeying in progress. */
1466 channel_after_select(readset, writeset);
1467 if (need_rekeying || packet_need_rekeying()) {
1468 debug("need rekeying");
1470 kex_send_kexinit(xxx_kex);
1475 /* Buffer input from the connection. */
1476 client_process_net_input(readset);
1478 /* Accept control connections. */
1479 client_process_control(readset);
1485 /* Buffer data from stdin */
1486 client_process_input(readset);
1488 * Process output to stdout and stderr. Output to
1489 * the connection is processed elsewhere (above).
1491 client_process_output(writeset);
1494 /* Send as much buffered packet data as possible to the sender. */
1495 if (FD_ISSET(connection_out, writeset))
1496 packet_write_poll();
1503 /* Terminate the session. */
1505 /* Stop watching for window change. */
1506 signal(SIGWINCH, SIG_DFL);
1513 /* restore blocking io */
1514 if (!isatty(fileno(stdin)))
1515 unset_nonblock(fileno(stdin));
1516 if (!isatty(fileno(stdout)))
1517 unset_nonblock(fileno(stdout));
1518 if (!isatty(fileno(stderr)))
1519 unset_nonblock(fileno(stderr));
1522 * If there was no shell or command requested, there will be no remote
1523 * exit status to be returned. In that case, clear error code if the
1524 * connection was deliberately terminated at this end.
1526 if (no_shell_flag && received_signal == SIGTERM) {
1527 received_signal = 0;
1531 if (received_signal)
1532 fatal("Killed by signal %d.", (int) received_signal);
1535 * In interactive mode (with pseudo tty) display a message indicating
1536 * that the connection has been closed.
1538 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1539 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1540 buffer_append(&stderr_buffer, buf, strlen(buf));
1543 /* Output any buffered data for stdout. */
1544 while (buffer_len(&stdout_buffer) > 0) {
1545 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1546 buffer_len(&stdout_buffer));
1548 error("Write failed flushing stdout buffer.");
1551 buffer_consume(&stdout_buffer, len);
1552 stdout_bytes += len;
1555 /* Output any buffered data for stderr. */
1556 while (buffer_len(&stderr_buffer) > 0) {
1557 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1558 buffer_len(&stderr_buffer));
1560 error("Write failed flushing stderr buffer.");
1563 buffer_consume(&stderr_buffer, len);
1564 stderr_bytes += len;
1567 /* Clear and free any buffers. */
1568 memset(buf, 0, sizeof(buf));
1569 buffer_free(&stdin_buffer);
1570 buffer_free(&stdout_buffer);
1571 buffer_free(&stderr_buffer);
1573 /* Report bytes transferred, and transfer rates. */
1574 total_time = get_current_time() - start_time;
1575 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1576 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1578 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1579 stdin_bytes / total_time, stdout_bytes / total_time,
1580 stderr_bytes / total_time);
1582 /* Return the exit status of the program. */
1583 debug("Exit status %d", exit_status);
1590 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1593 char *data = packet_get_string(&data_len);
1595 buffer_append(&stdout_buffer, data, data_len);
1596 memset(data, 0, data_len);
1600 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1603 char *data = packet_get_string(&data_len);
1605 buffer_append(&stderr_buffer, data, data_len);
1606 memset(data, 0, data_len);
1610 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1612 exit_status = packet_get_int();
1614 /* Acknowledge the exit. */
1615 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1618 * Must wait for packet to be sent since we are
1621 packet_write_wait();
1622 /* Flag that we want to exit. */
1626 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1629 int remote_id, sock;
1631 /* Read the remote channel number from the message. */
1632 remote_id = packet_get_int();
1636 * Get a connection to the local authentication agent (this may again
1639 sock = ssh_get_authentication_socket();
1642 * If we could not connect the agent, send an error message back to
1643 * the server. This should never happen unless the agent dies,
1644 * because authentication forwarding is only enabled if we have an
1648 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1649 -1, 0, 0, 0, "authentication agent connection", 1);
1650 c->remote_id = remote_id;
1654 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1655 packet_put_int(remote_id);
1657 /* Send a confirmation to the remote host. */
1658 debug("Forwarding authentication connection.");
1659 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1660 packet_put_int(remote_id);
1661 packet_put_int(c->self);
1667 client_request_forwarded_tcpip(const char *request_type, int rchan)
1670 char *listen_address, *originator_address;
1671 int listen_port, originator_port;
1674 /* Get rest of the packet */
1675 listen_address = packet_get_string(NULL);
1676 listen_port = packet_get_int();
1677 originator_address = packet_get_string(NULL);
1678 originator_port = packet_get_int();
1681 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1682 listen_address, listen_port, originator_address, originator_port);
1684 sock = channel_connect_by_listen_address(listen_port);
1686 xfree(originator_address);
1687 xfree(listen_address);
1690 c = channel_new("forwarded-tcpip",
1691 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1692 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1693 originator_address, 1);
1694 xfree(originator_address);
1695 xfree(listen_address);
1700 client_request_x11(const char *request_type, int rchan)
1704 int originator_port;
1707 if (!options.forward_x11) {
1708 error("Warning: ssh server tried X11 forwarding.");
1709 error("Warning: this is probably a break-in attempt by a malicious server.");
1712 originator = packet_get_string(NULL);
1713 if (datafellows & SSH_BUG_X11FWD) {
1714 debug2("buggy server: x11 request w/o originator_port");
1715 originator_port = 0;
1717 originator_port = packet_get_int();
1720 /* XXX check permission */
1721 debug("client_request_x11: request from %s %d", originator,
1724 sock = x11_connect_display();
1727 c = channel_new("x11",
1728 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1729 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1735 client_request_agent(const char *request_type, int rchan)
1740 if (!options.forward_agent) {
1741 error("Warning: ssh server tried agent forwarding.");
1742 error("Warning: this is probably a break-in attempt by a malicious server.");
1745 sock = ssh_get_authentication_socket();
1748 c = channel_new("authentication agent connection",
1749 SSH_CHANNEL_OPEN, sock, sock, -1,
1750 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1751 "authentication agent connection", 1);
1756 /* XXXX move to generic input handler */
1758 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1763 u_int rmaxpack, rwindow, len;
1765 ctype = packet_get_string(&len);
1766 rchan = packet_get_int();
1767 rwindow = packet_get_int();
1768 rmaxpack = packet_get_int();
1770 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1771 ctype, rchan, rwindow, rmaxpack);
1773 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1774 c = client_request_forwarded_tcpip(ctype, rchan);
1775 } else if (strcmp(ctype, "x11") == 0) {
1776 c = client_request_x11(ctype, rchan);
1777 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1778 c = client_request_agent(ctype, rchan);
1780 /* XXX duplicate : */
1782 debug("confirm %s", ctype);
1783 c->remote_id = rchan;
1784 c->remote_window = rwindow;
1785 c->remote_maxpacket = rmaxpack;
1786 if (c->type != SSH_CHANNEL_CONNECTING) {
1787 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1788 packet_put_int(c->remote_id);
1789 packet_put_int(c->self);
1790 packet_put_int(c->local_window);
1791 packet_put_int(c->local_maxpacket);
1795 debug("failure %s", ctype);
1796 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1797 packet_put_int(rchan);
1798 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1799 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1800 packet_put_cstring("open failed");
1801 packet_put_cstring("");
1808 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1811 int exitval, id, reply, success = 0;
1814 id = packet_get_int();
1815 rtype = packet_get_string(NULL);
1816 reply = packet_get_char();
1818 debug("client_input_channel_req: channel %d rtype %s reply %d",
1822 error("client_input_channel_req: request for channel -1");
1823 } else if ((c = channel_lookup(id)) == NULL) {
1824 error("client_input_channel_req: channel %d: unknown channel", id);
1825 } else if (strcmp(rtype, "exit-status") == 0) {
1826 exitval = packet_get_int();
1827 if (id == session_ident) {
1829 exit_status = exitval;
1830 } else if (c->ctl_fd == -1) {
1831 error("client_input_channel_req: unexpected channel %d",
1834 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1840 packet_start(success ?
1841 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1848 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1854 rtype = packet_get_string(NULL);
1855 want_reply = packet_get_char();
1856 debug("client_input_global_request: rtype %s want_reply %d",
1859 packet_start(success ?
1860 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1862 packet_write_wait();
1868 client_session2_setup(int id, int want_tty, int want_subsystem,
1869 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1870 dispatch_fn *subsys_repl)
1875 debug2("%s: id %d", __func__, id);
1877 if ((c = channel_lookup(id)) == NULL)
1878 fatal("client_session2_setup: channel %d: unknown channel", id);
1884 /* Store window size in the packet. */
1885 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1886 memset(&ws, 0, sizeof(ws));
1888 channel_request_start(id, "pty-req", 0);
1889 packet_put_cstring(term != NULL ? term : "");
1890 packet_put_int((u_int)ws.ws_col);
1891 packet_put_int((u_int)ws.ws_row);
1892 packet_put_int((u_int)ws.ws_xpixel);
1893 packet_put_int((u_int)ws.ws_ypixel);
1894 tio = get_saved_tio();
1895 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1897 /* XXX wait for reply */
1901 /* Transfer any environment variables from client to server */
1902 if (options.num_send_env != 0 && env != NULL) {
1906 debug("Sending environment.");
1907 for (i = 0; env[i] != NULL; i++) {
1909 name = xstrdup(env[i]);
1910 if ((val = strchr(name, '=')) == NULL) {
1917 for (j = 0; j < options.num_send_env; j++) {
1918 if (match_pattern(name, options.send_env[j])) {
1924 debug3("Ignored env %s", name);
1929 debug("Sending env %s = %s", name, val);
1930 channel_request_start(id, "env", 0);
1931 packet_put_cstring(name);
1932 packet_put_cstring(val);
1938 len = buffer_len(cmd);
1942 if (want_subsystem) {
1943 debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1944 channel_request_start(id, "subsystem", subsys_repl != NULL);
1945 if (subsys_repl != NULL) {
1946 /* register callback for reply */
1947 /* XXX we assume that client_loop has already been called */
1948 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1949 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1952 debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1953 channel_request_start(id, "exec", 0);
1955 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1958 channel_request_start(id, "shell", 0);
1964 client_init_dispatch_20(void)
1966 dispatch_init(&dispatch_protocol_error);
1968 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1969 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1970 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1971 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1972 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1973 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1974 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1975 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1976 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1977 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1980 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1982 /* global request reply messages */
1983 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1984 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1987 client_init_dispatch_13(void)
1989 dispatch_init(NULL);
1990 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1991 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1992 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1993 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1994 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1995 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1996 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1997 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1998 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2000 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2001 &client_input_agent_open : &deny_input_open);
2002 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2003 &x11_input_open : &deny_input_open);
2006 client_init_dispatch_15(void)
2008 client_init_dispatch_13();
2009 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2010 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2013 client_init_dispatch(void)
2016 client_init_dispatch_20();
2018 client_init_dispatch_13();
2020 client_init_dispatch_15();
2023 /* client specific fatal cleanup */
2028 leave_non_blocking();
2029 if (options.control_path != NULL && control_fd != -1)
2030 unlink(options.control_path);