1 /* $OpenBSD: clientloop.c,v 1.175 2006/08/03 03:34:42 deraadt 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>
101 #include "readconf.h"
102 #include "clientloop.h"
103 #include "sshconnect.h"
105 #include "atomicio.h"
108 #include "monitor_fdpass.h"
113 extern Options options;
115 /* Flag indicating that stdin should be redirected from /dev/null. */
116 extern int stdin_null_flag;
118 /* Flag indicating that no shell has been requested */
119 extern int no_shell_flag;
122 extern int control_fd;
125 * Name of the host we are connecting to. This is the name given on the
126 * command line, or the HostName specified for the user-supplied name in a
127 * configuration file.
132 * Flag to indicate that we have received a window change signal which has
133 * not yet been processed. This will cause a message indicating the new
134 * window size to be sent to the server a little later. This is volatile
135 * because this is updated in a signal handler.
137 static volatile sig_atomic_t received_window_change_signal = 0;
138 static volatile sig_atomic_t received_signal = 0;
140 /* Flag indicating whether the user's terminal is in non-blocking mode. */
141 static int in_non_blocking_mode = 0;
143 /* Common data for the client loop code. */
144 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
145 static int escape_char; /* Escape character. */
146 static int escape_pending; /* Last character was the escape character */
147 static int last_was_cr; /* Last character was a newline. */
148 static int exit_status; /* Used to store the exit status of the command. */
149 static int stdin_eof; /* EOF has been encountered on standard error. */
150 static Buffer stdin_buffer; /* Buffer for stdin data. */
151 static Buffer stdout_buffer; /* Buffer for stdout data. */
152 static Buffer stderr_buffer; /* Buffer for stderr data. */
153 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
154 static u_int buffer_high;/* Soft max buffer size. */
155 static int connection_in; /* Connection to server (input). */
156 static int connection_out; /* Connection to server (output). */
157 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
158 static int session_closed = 0; /* In SSH2: login session closed. */
159 static int server_alive_timeouts = 0;
161 static void client_init_dispatch(void);
162 int session_ident = -1;
178 void ssh_process_session2_setup(int, int, int, Buffer *);
180 /* Restores stdin to blocking mode. */
183 leave_non_blocking(void)
185 if (in_non_blocking_mode) {
186 unset_nonblock(fileno(stdin));
187 in_non_blocking_mode = 0;
191 /* Puts stdin terminal in non-blocking mode. */
194 enter_non_blocking(void)
196 in_non_blocking_mode = 1;
197 set_nonblock(fileno(stdin));
201 * Signal handler for the window change signal (SIGWINCH). This just sets a
202 * flag indicating that the window has changed.
206 window_change_handler(int sig)
208 received_window_change_signal = 1;
209 signal(SIGWINCH, window_change_handler);
213 * Signal handler for signals that cause the program to terminate. These
214 * signals must be trapped to restore terminal modes.
218 signal_handler(int sig)
220 received_signal = sig;
225 * Returns current time in seconds from Jan 1, 1970 with the maximum
226 * available resolution.
230 get_current_time(void)
233 gettimeofday(&tv, NULL);
234 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
237 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
239 client_x11_get_proto(const char *display, const char *xauth_path,
240 u_int trusted, char **_proto, char **_data)
245 static char proto[512], data[512];
247 int got_data = 0, generated = 0, do_unlink = 0, i;
248 char *xauthdir, *xauthfile;
251 xauthdir = xauthfile = NULL;
254 proto[0] = data[0] = '\0';
256 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
257 debug("No xauth program.");
259 if (display == NULL) {
260 debug("x11_get_proto: DISPLAY not set");
264 * Handle FamilyLocal case where $DISPLAY does
265 * not match an authorization entry. For this we
266 * just try "xauth list unix:displaynum.screennum".
267 * XXX: "localhost" match to determine FamilyLocal
270 if (strncmp(display, "localhost:", 10) == 0) {
271 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
276 xauthdir = xmalloc(MAXPATHLEN);
277 xauthfile = xmalloc(MAXPATHLEN);
278 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
279 if (mkdtemp(xauthdir) != NULL) {
281 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
283 snprintf(cmd, sizeof(cmd),
284 "%s -f %s generate %s " SSH_X11_PROTO
285 " untrusted timeout 1200 2>" _PATH_DEVNULL,
286 xauth_path, xauthfile, display);
287 debug2("x11_get_proto: %s", cmd);
288 if (system(cmd) == 0)
292 snprintf(cmd, sizeof(cmd),
293 "%s %s%s list %s 2>" _PATH_DEVNULL,
295 generated ? "-f " : "" ,
296 generated ? xauthfile : "",
298 debug2("x11_get_proto: %s", cmd);
300 if (f && fgets(line, sizeof(line), f) &&
301 sscanf(line, "%*s %511s %511s", proto, data) == 2)
317 * If we didn't get authentication data, just make up some
318 * data. The forwarding code will check the validity of the
319 * response anyway, and substitute this data. The X11
320 * server, however, will ignore this fake data and use
321 * whatever authentication mechanisms it was using otherwise
322 * for the local connection.
327 logit("Warning: No xauth data; "
328 "using fake authentication data for X11 forwarding.");
329 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
330 for (i = 0; i < 16; i++) {
333 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
341 * This is called when the interactive is entered. This checks if there is
342 * an EOF coming on stdin. We must check this explicitly, as select() does
343 * not appear to wake up when redirecting from /dev/null.
347 client_check_initial_eof_on_stdin(void)
353 * If standard input is to be "redirected from /dev/null", we simply
354 * mark that we have seen an EOF and send an EOF message to the
355 * server. Otherwise, we try to read a single character; it appears
356 * that for some files, such /dev/null, select() never wakes up for
357 * read for this descriptor, which means that we never get EOF. This
358 * way we will get the EOF if stdin comes from /dev/null or similar.
360 if (stdin_null_flag) {
361 /* Fake EOF on stdin. */
362 debug("Sending eof.");
364 packet_start(SSH_CMSG_EOF);
367 enter_non_blocking();
369 /* Check for immediate EOF on stdin. */
370 len = read(fileno(stdin), buf, 1);
372 /* EOF. Record that we have seen it and send EOF to server. */
373 debug("Sending eof.");
375 packet_start(SSH_CMSG_EOF);
377 } else if (len > 0) {
379 * Got data. We must store the data in the buffer,
380 * and also process it as an escape character if
383 if ((u_char) buf[0] == escape_char)
386 buffer_append(&stdin_buffer, buf, 1);
388 leave_non_blocking();
394 * Make packets from buffered stdin data, and buffer them for sending to the
399 client_make_packets_from_stdin_data(void)
403 /* Send buffered stdin data to the server. */
404 while (buffer_len(&stdin_buffer) > 0 &&
405 packet_not_very_much_data_to_write()) {
406 len = buffer_len(&stdin_buffer);
407 /* Keep the packets at reasonable size. */
408 if (len > packet_get_maxsize())
409 len = packet_get_maxsize();
410 packet_start(SSH_CMSG_STDIN_DATA);
411 packet_put_string(buffer_ptr(&stdin_buffer), len);
413 buffer_consume(&stdin_buffer, len);
415 /* If we have a pending EOF, send it now. */
416 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
417 packet_start(SSH_CMSG_EOF);
424 * Checks if the client window has changed, and sends a packet about it to
425 * the server if so. The actual change is detected elsewhere (by a software
426 * interrupt on Unix); this just checks the flag and sends a message if
431 client_check_window_change(void)
435 if (! received_window_change_signal)
438 received_window_change_signal = 0;
440 debug2("client_check_window_change: changed");
443 channel_send_window_changes();
445 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
447 packet_start(SSH_CMSG_WINDOW_SIZE);
448 packet_put_int((u_int)ws.ws_row);
449 packet_put_int((u_int)ws.ws_col);
450 packet_put_int((u_int)ws.ws_xpixel);
451 packet_put_int((u_int)ws.ws_ypixel);
457 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
459 server_alive_timeouts = 0;
460 client_global_request_reply_fwd(type, seq, ctxt);
464 server_alive_check(void)
466 if (++server_alive_timeouts > options.server_alive_count_max)
467 packet_disconnect("Timeout, server not responding.");
468 packet_start(SSH2_MSG_GLOBAL_REQUEST);
469 packet_put_cstring("keepalive@openssh.com");
470 packet_put_char(1); /* boolean: want reply */
475 * Waits until the client can do something (some data becomes available on
476 * one of the file descriptors).
479 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
480 int *maxfdp, u_int *nallocp, int rekeying)
482 struct timeval tv, *tvp;
485 /* Add any selections by the channel mechanism. */
486 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
489 /* Read from the connection, unless our buffers are full. */
490 if (buffer_len(&stdout_buffer) < buffer_high &&
491 buffer_len(&stderr_buffer) < buffer_high &&
492 channel_not_very_much_buffered_data())
493 FD_SET(connection_in, *readsetp);
495 * Read from stdin, unless we have seen EOF or have very much
496 * buffered data to send to the server.
498 if (!stdin_eof && packet_not_very_much_data_to_write())
499 FD_SET(fileno(stdin), *readsetp);
501 /* Select stdout/stderr if have data in buffer. */
502 if (buffer_len(&stdout_buffer) > 0)
503 FD_SET(fileno(stdout), *writesetp);
504 if (buffer_len(&stderr_buffer) > 0)
505 FD_SET(fileno(stderr), *writesetp);
507 /* channel_prepare_select could have closed the last channel */
508 if (session_closed && !channel_still_open() &&
509 !packet_have_data_to_write()) {
510 /* clear mask since we did not call select() */
511 memset(*readsetp, 0, *nallocp);
512 memset(*writesetp, 0, *nallocp);
515 FD_SET(connection_in, *readsetp);
519 /* Select server connection if have data to write to the server. */
520 if (packet_have_data_to_write())
521 FD_SET(connection_out, *writesetp);
523 if (control_fd != -1)
524 FD_SET(control_fd, *readsetp);
527 * Wait for something to happen. This will suspend the process until
528 * some selected descriptor can be read, written, or has some other
532 if (options.server_alive_interval == 0 || !compat20)
535 tv.tv_sec = options.server_alive_interval;
539 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
544 * We have to clear the select masks, because we return.
545 * We have to return, because the mainloop checks for the flags
546 * set by the signal handlers.
548 memset(*readsetp, 0, *nallocp);
549 memset(*writesetp, 0, *nallocp);
553 /* Note: we might still have data in the buffers. */
554 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
555 buffer_append(&stderr_buffer, buf, strlen(buf));
558 server_alive_check();
562 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
564 /* Flush stdout and stderr buffers. */
565 if (buffer_len(bout) > 0)
566 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
567 if (buffer_len(berr) > 0)
568 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
573 * Free (and clear) the buffer to reduce the amount of data that gets
580 /* Send the suspend signal to the program itself. */
581 kill(getpid(), SIGTSTP);
583 /* Reset window sizes in case they have changed */
584 received_window_change_signal = 1;
586 /* OK, we have been continued by the user. Reinitialize buffers. */
595 client_process_net_input(fd_set *readset)
601 * Read input from the server, and add any such data to the buffer of
602 * the packet subsystem.
604 if (FD_ISSET(connection_in, readset)) {
605 /* Read as much as possible. */
606 len = read(connection_in, buf, sizeof(buf));
608 /* Received EOF. The remote host has closed the connection. */
609 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
611 buffer_append(&stderr_buffer, buf, strlen(buf));
616 * There is a kernel bug on Solaris that causes select to
617 * sometimes wake up even though there is no data available.
619 if (len < 0 && (errno == EAGAIN || errno == EINTR))
623 /* An error has encountered. Perhaps there is a network problem. */
624 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
625 host, strerror(errno));
626 buffer_append(&stderr_buffer, buf, strlen(buf));
630 packet_process_incoming(buf, len);
635 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
640 id = packet_get_int();
643 if ((c = channel_lookup(id)) == NULL) {
644 error("%s: no channel for id %d", __func__, id);
648 if (type == SSH2_MSG_CHANNEL_SUCCESS)
649 debug2("Request suceeded on channel %d", id);
650 else if (type == SSH2_MSG_CHANNEL_FAILURE) {
651 error("Request failed on channel %d", id);
657 client_extra_session2_setup(int id, void *arg)
659 struct confirm_ctx *cctx = arg;
665 fatal("%s: cctx == NULL", __func__);
666 if ((c = channel_lookup(id)) == NULL)
667 fatal("%s: no channel for id %d", __func__, id);
669 display = getenv("DISPLAY");
670 if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
672 /* Get reasonable local authentication information. */
673 client_x11_get_proto(display, options.xauth_location,
674 options.forward_x11_trusted, &proto, &data);
675 /* Request forwarding with authentication spoofing. */
676 debug("Requesting X11 forwarding with authentication spoofing.");
677 x11_request_forwarding_with_spoofing(id, display, proto, data);
678 /* XXX wait for reply */
681 if (cctx->want_agent_fwd && options.forward_agent) {
682 debug("Requesting authentication agent forwarding.");
683 channel_request_start(id, "auth-agent-req@openssh.com", 0);
687 client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
688 cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
689 client_subsystem_reply);
691 c->confirm_ctx = NULL;
692 buffer_free(&cctx->cmd);
694 if (cctx->env != NULL) {
695 for (i = 0; cctx->env[i] != NULL; i++)
703 client_process_control(fd_set *readset)
707 int client_fd, new_fd[3], ver, allowed;
709 struct sockaddr_storage addr;
710 struct confirm_ctx *cctx;
712 u_int i, len, env_len, command, flags;
717 * Accept connection on control socket
719 if (control_fd == -1 || !FD_ISSET(control_fd, readset))
722 memset(&addr, 0, sizeof(addr));
723 addrlen = sizeof(addr);
724 if ((client_fd = accept(control_fd,
725 (struct sockaddr*)&addr, &addrlen)) == -1) {
726 error("%s accept: %s", __func__, strerror(errno));
730 if (getpeereid(client_fd, &euid, &egid) < 0) {
731 error("%s getpeereid failed: %s", __func__, strerror(errno));
735 if ((euid != 0) && (getuid() != euid)) {
736 error("control mode uid mismatch: peer euid %u != uid %u",
737 (u_int) euid, (u_int) getuid());
742 unset_nonblock(client_fd);
746 if (ssh_msg_recv(client_fd, &m) == -1) {
747 error("%s: client msg_recv failed", __func__);
752 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
753 error("%s: wrong client version %d", __func__, ver);
760 command = buffer_get_int(&m);
761 flags = buffer_get_int(&m);
766 case SSHMUX_COMMAND_OPEN:
767 if (options.control_master == SSHCTL_MASTER_ASK ||
768 options.control_master == SSHCTL_MASTER_AUTO_ASK)
769 allowed = ask_permission("Allow shared connection "
773 case SSHMUX_COMMAND_TERMINATE:
774 if (options.control_master == SSHCTL_MASTER_ASK ||
775 options.control_master == SSHCTL_MASTER_AUTO_ASK)
776 allowed = ask_permission("Terminate shared connection "
781 case SSHMUX_COMMAND_ALIVE_CHECK:
782 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
784 buffer_put_int(&m, allowed);
785 buffer_put_int(&m, getpid());
786 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
787 error("%s: client msg_send failed", __func__);
796 error("Unsupported command %d", command);
802 /* Reply for SSHMUX_COMMAND_OPEN */
804 buffer_put_int(&m, allowed);
805 buffer_put_int(&m, getpid());
806 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
807 error("%s: client msg_send failed", __func__);
814 error("Refused control connection");
821 if (ssh_msg_recv(client_fd, &m) == -1) {
822 error("%s: client msg_recv failed", __func__);
827 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
828 error("%s: wrong client version %d", __func__, ver);
834 cctx = xcalloc(1, sizeof(*cctx));
835 cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
836 cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
837 cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
838 cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
839 cctx->term = buffer_get_string(&m, &len);
841 cmd = buffer_get_string(&m, &len);
842 buffer_init(&cctx->cmd);
843 buffer_append(&cctx->cmd, cmd, strlen(cmd));
845 env_len = buffer_get_int(&m);
846 env_len = MIN(env_len, 4096);
847 debug3("%s: receiving %d env vars", __func__, env_len);
849 cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
850 for (i = 0; i < env_len; i++)
851 cctx->env[i] = buffer_get_string(&m, &len);
855 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
856 cctx->want_tty, cctx->want_subsys, cmd);
859 /* Gather fds from client */
860 new_fd[0] = mm_receive_fd(client_fd);
861 new_fd[1] = mm_receive_fd(client_fd);
862 new_fd[2] = mm_receive_fd(client_fd);
864 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
865 new_fd[0], new_fd[1], new_fd[2]);
867 /* Try to pick up ttymodes from client before it goes raw */
868 if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
869 error("%s: tcgetattr: %s", __func__, strerror(errno));
871 /* This roundtrip is just for synchronisation of ttymodes */
873 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
874 error("%s: client msg_send failed", __func__);
882 for (i = 0; i < env_len; i++)
890 /* enable nonblocking unless tty */
891 if (!isatty(new_fd[0]))
892 set_nonblock(new_fd[0]);
893 if (!isatty(new_fd[1]))
894 set_nonblock(new_fd[1]);
895 if (!isatty(new_fd[2]))
896 set_nonblock(new_fd[2]);
898 set_nonblock(client_fd);
900 c = channel_new("session", SSH_CHANNEL_OPENING,
901 new_fd[0], new_fd[1], new_fd[2],
902 CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
903 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
906 c->ctl_fd = client_fd;
908 debug3("%s: channel_new: %d", __func__, c->self);
910 channel_send_open(c->self);
911 channel_register_confirm(c->self, client_extra_session2_setup, cctx);
915 process_cmdline(void)
917 void (*handler)(int);
918 char *s, *cmd, *cancel_host;
925 handler = signal(SIGINT, SIG_IGN);
926 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
929 while (*s && isspace(*s))
932 s++; /* Skip cmdline '-', if any */
936 if (*s == 'h' || *s == 'H' || *s == '?') {
938 logit(" -L[bind_address:]port:host:hostport "
939 "Request local forward");
940 logit(" -R[bind_address:]port:host:hostport "
941 "Request remote forward");
942 logit(" -KR[bind_address:]port "
943 "Cancel remote forward");
944 if (!options.permit_local_command)
947 "Execute local command");
951 if (*s == '!' && options.permit_local_command) {
961 if (*s != 'L' && *s != 'R') {
962 logit("Invalid command.");
967 if (local && delete) {
968 logit("Not supported.");
971 if ((!local || delete) && !compat20) {
972 logit("Not supported for SSH protocol version 1.");
977 while (*s && isspace(*s))
982 cancel_host = hpdelim(&s); /* may be NULL */
984 cancel_port = a2port(s);
985 cancel_host = cleanhostname(cancel_host);
987 cancel_port = a2port(cancel_host);
990 if (cancel_port == 0) {
991 logit("Bad forwarding close port");
994 channel_request_rforward_cancel(cancel_host, cancel_port);
996 if (!parse_forward(&fwd, s)) {
997 logit("Bad forwarding specification.");
1001 if (channel_setup_local_fwd_listener(fwd.listen_host,
1002 fwd.listen_port, fwd.connect_host,
1003 fwd.connect_port, options.gateway_ports) < 0) {
1004 logit("Port forwarding failed.");
1008 if (channel_request_remote_forwarding(fwd.listen_host,
1009 fwd.listen_port, fwd.connect_host,
1010 fwd.connect_port) < 0) {
1011 logit("Port forwarding failed.");
1016 logit("Forwarding port.");
1020 signal(SIGINT, handler);
1026 /* process the characters one by one */
1028 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1040 for (i = 0; i < (u_int)len; i++) {
1041 /* Get one character at a time. */
1044 if (escape_pending) {
1045 /* We have previously seen an escape character. */
1046 /* Clear the flag now. */
1049 /* Process the escaped character. */
1052 /* Terminate the connection. */
1053 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1054 buffer_append(berr, string, strlen(string));
1060 /* Suspend the program. */
1061 /* Print a message to that effect to the user. */
1062 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1063 buffer_append(berr, string, strlen(string));
1065 /* Restore terminal modes and suspend. */
1066 client_suspend_self(bin, bout, berr);
1068 /* We have been continued. */
1073 snprintf(string, sizeof string,
1074 "%cB\r\n", escape_char);
1075 buffer_append(berr, string,
1077 channel_request_start(session_ident,
1079 packet_put_int(1000);
1086 if (datafellows & SSH_BUG_NOREKEY)
1087 logit("Server does not support re-keying");
1095 * Detach the program (continue to serve connections,
1096 * but put in background and no more new connections).
1098 /* Restore tty modes. */
1101 /* Stop listening for new connections. */
1102 channel_stop_listening();
1104 snprintf(string, sizeof string,
1105 "%c& [backgrounded]\n", escape_char);
1106 buffer_append(berr, string, strlen(string));
1108 /* Fork into background. */
1111 error("fork: %.100s", strerror(errno));
1114 if (pid != 0) { /* This is the parent. */
1115 /* The parent just exits. */
1118 /* The child continues serving connections. */
1120 buffer_append(bin, "\004", 1);
1121 /* fake EOF on stdin */
1123 } else if (!stdin_eof) {
1125 * Sending SSH_CMSG_EOF alone does not always appear
1126 * to be enough. So we try to send an EOF character
1129 packet_start(SSH_CMSG_STDIN_DATA);
1130 packet_put_string("\004", 1);
1134 if (buffer_len(bin) == 0) {
1135 packet_start(SSH_CMSG_EOF);
1142 snprintf(string, sizeof string,
1144 Supported escape sequences:\r\n\
1145 %c. - terminate connection\r\n\
1146 %cB - send a BREAK to the remote system\r\n\
1147 %cC - open a command line\r\n\
1148 %cR - Request rekey (SSH protocol 2 only)\r\n\
1149 %c^Z - suspend ssh\r\n\
1150 %c# - list forwarded connections\r\n\
1151 %c& - background ssh (when waiting for connections to terminate)\r\n\
1152 %c? - this message\r\n\
1153 %c%c - send the escape character by typing it twice\r\n\
1154 (Note that escapes are only recognized immediately after newline.)\r\n",
1155 escape_char, escape_char, escape_char, escape_char,
1156 escape_char, escape_char, escape_char, escape_char,
1157 escape_char, escape_char, escape_char);
1158 buffer_append(berr, string, strlen(string));
1162 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1163 buffer_append(berr, string, strlen(string));
1164 s = channel_open_message();
1165 buffer_append(berr, s, strlen(s));
1174 if (ch != escape_char) {
1175 buffer_put_char(bin, escape_char);
1178 /* Escaped characters fall through here */
1183 * The previous character was not an escape char. Check if this
1186 if (last_was_cr && ch == escape_char) {
1187 /* It is. Set the flag and continue to next character. */
1194 * Normal character. Record whether it was a newline,
1195 * and append it to the buffer.
1197 last_was_cr = (ch == '\r' || ch == '\n');
1198 buffer_put_char(bin, ch);
1205 client_process_input(fd_set *readset)
1210 /* Read input from stdin. */
1211 if (FD_ISSET(fileno(stdin), readset)) {
1212 /* Read as much as possible. */
1213 len = read(fileno(stdin), buf, sizeof(buf));
1214 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1215 return; /* we'll try again later */
1218 * Received EOF or error. They are treated
1219 * similarly, except that an error message is printed
1220 * if it was an error condition.
1223 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1224 buffer_append(&stderr_buffer, buf, strlen(buf));
1226 /* Mark that we have seen EOF. */
1229 * Send an EOF message to the server unless there is
1230 * data in the buffer. If there is data in the
1231 * buffer, no message will be sent now. Code
1232 * elsewhere will send the EOF when the buffer
1233 * becomes empty if stdin_eof is set.
1235 if (buffer_len(&stdin_buffer) == 0) {
1236 packet_start(SSH_CMSG_EOF);
1239 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1241 * Normal successful read, and no escape character.
1242 * Just append the data to buffer.
1244 buffer_append(&stdin_buffer, buf, len);
1247 * Normal, successful read. But we have an escape character
1248 * and have to process the characters one by one.
1250 if (process_escapes(&stdin_buffer, &stdout_buffer,
1251 &stderr_buffer, buf, len) == -1)
1258 client_process_output(fd_set *writeset)
1263 /* Write buffered output to stdout. */
1264 if (FD_ISSET(fileno(stdout), writeset)) {
1265 /* Write as much data as possible. */
1266 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1267 buffer_len(&stdout_buffer));
1269 if (errno == EINTR || errno == EAGAIN)
1273 * An error or EOF was encountered. Put an
1274 * error message to stderr buffer.
1276 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1277 buffer_append(&stderr_buffer, buf, strlen(buf));
1282 /* Consume printed data from the buffer. */
1283 buffer_consume(&stdout_buffer, len);
1284 stdout_bytes += len;
1286 /* Write buffered output to stderr. */
1287 if (FD_ISSET(fileno(stderr), writeset)) {
1288 /* Write as much data as possible. */
1289 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1290 buffer_len(&stderr_buffer));
1292 if (errno == EINTR || errno == EAGAIN)
1295 /* EOF or error, but can't even print error message. */
1300 /* Consume printed characters from the buffer. */
1301 buffer_consume(&stderr_buffer, len);
1302 stderr_bytes += len;
1307 * Get packets from the connection input buffer, and process them as long as
1308 * there are packets available.
1310 * Any unknown packets received during the actual
1311 * session cause the session to terminate. This is
1312 * intended to make debugging easier since no
1313 * confirmations are sent. Any compatible protocol
1314 * extensions must be negotiated during the
1315 * preparatory phase.
1319 client_process_buffered_input_packets(void)
1321 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1324 /* scan buf[] for '~' before sending data to the peer */
1327 simple_escape_filter(Channel *c, char *buf, int len)
1329 /* XXX we assume c->extended is writeable */
1330 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1334 client_channel_closed(int id, void *arg)
1336 channel_cancel_cleanup(id);
1342 * Implements the interactive session with the server. This is called after
1343 * the user has been authenticated, and a command has been started on the
1344 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1345 * used as an escape character for terminating or suspending the session.
1349 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1351 fd_set *readset = NULL, *writeset = NULL;
1352 double start_time, total_time;
1353 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1357 debug("Entering interactive session.");
1359 start_time = get_current_time();
1361 /* Initialize variables. */
1366 buffer_high = 64 * 1024;
1367 connection_in = packet_get_connection_in();
1368 connection_out = packet_get_connection_out();
1369 max_fd = MAX(connection_in, connection_out);
1370 if (control_fd != -1)
1371 max_fd = MAX(max_fd, control_fd);
1374 /* enable nonblocking unless tty */
1375 if (!isatty(fileno(stdin)))
1376 set_nonblock(fileno(stdin));
1377 if (!isatty(fileno(stdout)))
1378 set_nonblock(fileno(stdout));
1379 if (!isatty(fileno(stderr)))
1380 set_nonblock(fileno(stderr));
1381 max_fd = MAX(max_fd, fileno(stdin));
1382 max_fd = MAX(max_fd, fileno(stdout));
1383 max_fd = MAX(max_fd, fileno(stderr));
1389 escape_char = escape_char_arg;
1391 /* Initialize buffers. */
1392 buffer_init(&stdin_buffer);
1393 buffer_init(&stdout_buffer);
1394 buffer_init(&stderr_buffer);
1396 client_init_dispatch();
1399 * Set signal handlers, (e.g. to restore non-blocking mode)
1400 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1402 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1403 signal(SIGHUP, signal_handler);
1404 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1405 signal(SIGINT, signal_handler);
1406 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1407 signal(SIGQUIT, signal_handler);
1408 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1409 signal(SIGTERM, signal_handler);
1410 signal(SIGWINCH, window_change_handler);
1416 session_ident = ssh2_chan_id;
1417 if (escape_char != SSH_ESCAPECHAR_NONE)
1418 channel_register_filter(session_ident,
1419 simple_escape_filter, NULL);
1420 if (session_ident != -1)
1421 channel_register_cleanup(session_ident,
1422 client_channel_closed, 0);
1424 /* Check if we should immediately send eof on stdin. */
1425 client_check_initial_eof_on_stdin();
1428 /* Main loop of the client for the interactive session mode. */
1429 while (!quit_pending) {
1431 /* Process buffered packets sent by the server. */
1432 client_process_buffered_input_packets();
1434 if (compat20 && session_closed && !channel_still_open())
1437 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1440 debug("rekeying in progress");
1443 * Make packets of buffered stdin data, and buffer
1444 * them for sending to the server.
1447 client_make_packets_from_stdin_data();
1450 * Make packets from buffered channel data, and
1451 * enqueue them for sending to the server.
1453 if (packet_not_very_much_data_to_write())
1454 channel_output_poll();
1457 * Check if the window size has changed, and buffer a
1458 * message about it to the server if so.
1460 client_check_window_change();
1466 * Wait until we have something to do (something becomes
1467 * available on one of the descriptors).
1470 client_wait_until_can_do_something(&readset, &writeset,
1471 &max_fd2, &nalloc, rekeying);
1476 /* Do channel operations unless rekeying in progress. */
1478 channel_after_select(readset, writeset);
1479 if (need_rekeying || packet_need_rekeying()) {
1480 debug("need rekeying");
1482 kex_send_kexinit(xxx_kex);
1487 /* Buffer input from the connection. */
1488 client_process_net_input(readset);
1490 /* Accept control connections. */
1491 client_process_control(readset);
1497 /* Buffer data from stdin */
1498 client_process_input(readset);
1500 * Process output to stdout and stderr. Output to
1501 * the connection is processed elsewhere (above).
1503 client_process_output(writeset);
1506 /* Send as much buffered packet data as possible to the sender. */
1507 if (FD_ISSET(connection_out, writeset))
1508 packet_write_poll();
1515 /* Terminate the session. */
1517 /* Stop watching for window change. */
1518 signal(SIGWINCH, SIG_DFL);
1525 /* restore blocking io */
1526 if (!isatty(fileno(stdin)))
1527 unset_nonblock(fileno(stdin));
1528 if (!isatty(fileno(stdout)))
1529 unset_nonblock(fileno(stdout));
1530 if (!isatty(fileno(stderr)))
1531 unset_nonblock(fileno(stderr));
1534 * If there was no shell or command requested, there will be no remote
1535 * exit status to be returned. In that case, clear error code if the
1536 * connection was deliberately terminated at this end.
1538 if (no_shell_flag && received_signal == SIGTERM) {
1539 received_signal = 0;
1543 if (received_signal)
1544 fatal("Killed by signal %d.", (int) received_signal);
1547 * In interactive mode (with pseudo tty) display a message indicating
1548 * that the connection has been closed.
1550 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1551 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1552 buffer_append(&stderr_buffer, buf, strlen(buf));
1555 /* Output any buffered data for stdout. */
1556 while (buffer_len(&stdout_buffer) > 0) {
1557 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1558 buffer_len(&stdout_buffer));
1560 error("Write failed flushing stdout buffer.");
1563 buffer_consume(&stdout_buffer, len);
1564 stdout_bytes += len;
1567 /* Output any buffered data for stderr. */
1568 while (buffer_len(&stderr_buffer) > 0) {
1569 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1570 buffer_len(&stderr_buffer));
1572 error("Write failed flushing stderr buffer.");
1575 buffer_consume(&stderr_buffer, len);
1576 stderr_bytes += len;
1579 /* Clear and free any buffers. */
1580 memset(buf, 0, sizeof(buf));
1581 buffer_free(&stdin_buffer);
1582 buffer_free(&stdout_buffer);
1583 buffer_free(&stderr_buffer);
1585 /* Report bytes transferred, and transfer rates. */
1586 total_time = get_current_time() - start_time;
1587 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1588 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1590 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1591 stdin_bytes / total_time, stdout_bytes / total_time,
1592 stderr_bytes / total_time);
1594 /* Return the exit status of the program. */
1595 debug("Exit status %d", exit_status);
1602 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1605 char *data = packet_get_string(&data_len);
1607 buffer_append(&stdout_buffer, data, data_len);
1608 memset(data, 0, data_len);
1612 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1615 char *data = packet_get_string(&data_len);
1617 buffer_append(&stderr_buffer, data, data_len);
1618 memset(data, 0, data_len);
1622 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1624 exit_status = packet_get_int();
1626 /* Acknowledge the exit. */
1627 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1630 * Must wait for packet to be sent since we are
1633 packet_write_wait();
1634 /* Flag that we want to exit. */
1638 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1641 int remote_id, sock;
1643 /* Read the remote channel number from the message. */
1644 remote_id = packet_get_int();
1648 * Get a connection to the local authentication agent (this may again
1651 sock = ssh_get_authentication_socket();
1654 * If we could not connect the agent, send an error message back to
1655 * the server. This should never happen unless the agent dies,
1656 * because authentication forwarding is only enabled if we have an
1660 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1661 -1, 0, 0, 0, "authentication agent connection", 1);
1662 c->remote_id = remote_id;
1666 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1667 packet_put_int(remote_id);
1669 /* Send a confirmation to the remote host. */
1670 debug("Forwarding authentication connection.");
1671 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1672 packet_put_int(remote_id);
1673 packet_put_int(c->self);
1679 client_request_forwarded_tcpip(const char *request_type, int rchan)
1682 char *listen_address, *originator_address;
1683 int listen_port, originator_port;
1686 /* Get rest of the packet */
1687 listen_address = packet_get_string(NULL);
1688 listen_port = packet_get_int();
1689 originator_address = packet_get_string(NULL);
1690 originator_port = packet_get_int();
1693 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1694 listen_address, listen_port, originator_address, originator_port);
1696 sock = channel_connect_by_listen_address(listen_port);
1698 xfree(originator_address);
1699 xfree(listen_address);
1702 c = channel_new("forwarded-tcpip",
1703 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1704 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1705 originator_address, 1);
1706 xfree(originator_address);
1707 xfree(listen_address);
1712 client_request_x11(const char *request_type, int rchan)
1716 int originator_port;
1719 if (!options.forward_x11) {
1720 error("Warning: ssh server tried X11 forwarding.");
1721 error("Warning: this is probably a break-in attempt by a malicious server.");
1724 originator = packet_get_string(NULL);
1725 if (datafellows & SSH_BUG_X11FWD) {
1726 debug2("buggy server: x11 request w/o originator_port");
1727 originator_port = 0;
1729 originator_port = packet_get_int();
1732 /* XXX check permission */
1733 debug("client_request_x11: request from %s %d", originator,
1736 sock = x11_connect_display();
1739 c = channel_new("x11",
1740 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1741 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1747 client_request_agent(const char *request_type, int rchan)
1752 if (!options.forward_agent) {
1753 error("Warning: ssh server tried agent forwarding.");
1754 error("Warning: this is probably a break-in attempt by a malicious server.");
1757 sock = ssh_get_authentication_socket();
1760 c = channel_new("authentication agent connection",
1761 SSH_CHANNEL_OPEN, sock, sock, -1,
1762 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1763 "authentication agent connection", 1);
1768 /* XXXX move to generic input handler */
1770 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1775 u_int rmaxpack, rwindow, len;
1777 ctype = packet_get_string(&len);
1778 rchan = packet_get_int();
1779 rwindow = packet_get_int();
1780 rmaxpack = packet_get_int();
1782 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1783 ctype, rchan, rwindow, rmaxpack);
1785 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1786 c = client_request_forwarded_tcpip(ctype, rchan);
1787 } else if (strcmp(ctype, "x11") == 0) {
1788 c = client_request_x11(ctype, rchan);
1789 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1790 c = client_request_agent(ctype, rchan);
1792 /* XXX duplicate : */
1794 debug("confirm %s", ctype);
1795 c->remote_id = rchan;
1796 c->remote_window = rwindow;
1797 c->remote_maxpacket = rmaxpack;
1798 if (c->type != SSH_CHANNEL_CONNECTING) {
1799 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1800 packet_put_int(c->remote_id);
1801 packet_put_int(c->self);
1802 packet_put_int(c->local_window);
1803 packet_put_int(c->local_maxpacket);
1807 debug("failure %s", ctype);
1808 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1809 packet_put_int(rchan);
1810 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1811 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1812 packet_put_cstring("open failed");
1813 packet_put_cstring("");
1820 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1823 int exitval, id, reply, success = 0;
1826 id = packet_get_int();
1827 rtype = packet_get_string(NULL);
1828 reply = packet_get_char();
1830 debug("client_input_channel_req: channel %d rtype %s reply %d",
1834 error("client_input_channel_req: request for channel -1");
1835 } else if ((c = channel_lookup(id)) == NULL) {
1836 error("client_input_channel_req: channel %d: unknown channel", id);
1837 } else if (strcmp(rtype, "exit-status") == 0) {
1838 exitval = packet_get_int();
1839 if (id == session_ident) {
1841 exit_status = exitval;
1842 } else if (c->ctl_fd == -1) {
1843 error("client_input_channel_req: unexpected channel %d",
1846 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1852 packet_start(success ?
1853 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1860 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1866 rtype = packet_get_string(NULL);
1867 want_reply = packet_get_char();
1868 debug("client_input_global_request: rtype %s want_reply %d",
1871 packet_start(success ?
1872 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1874 packet_write_wait();
1880 client_session2_setup(int id, int want_tty, int want_subsystem,
1881 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1882 dispatch_fn *subsys_repl)
1887 debug2("%s: id %d", __func__, id);
1889 if ((c = channel_lookup(id)) == NULL)
1890 fatal("client_session2_setup: channel %d: unknown channel", id);
1896 /* Store window size in the packet. */
1897 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1898 memset(&ws, 0, sizeof(ws));
1900 channel_request_start(id, "pty-req", 0);
1901 packet_put_cstring(term != NULL ? term : "");
1902 packet_put_int((u_int)ws.ws_col);
1903 packet_put_int((u_int)ws.ws_row);
1904 packet_put_int((u_int)ws.ws_xpixel);
1905 packet_put_int((u_int)ws.ws_ypixel);
1906 tio = get_saved_tio();
1907 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1909 /* XXX wait for reply */
1913 /* Transfer any environment variables from client to server */
1914 if (options.num_send_env != 0 && env != NULL) {
1918 debug("Sending environment.");
1919 for (i = 0; env[i] != NULL; i++) {
1921 name = xstrdup(env[i]);
1922 if ((val = strchr(name, '=')) == NULL) {
1929 for (j = 0; j < options.num_send_env; j++) {
1930 if (match_pattern(name, options.send_env[j])) {
1936 debug3("Ignored env %s", name);
1941 debug("Sending env %s = %s", name, val);
1942 channel_request_start(id, "env", 0);
1943 packet_put_cstring(name);
1944 packet_put_cstring(val);
1950 len = buffer_len(cmd);
1954 if (want_subsystem) {
1955 debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1956 channel_request_start(id, "subsystem", subsys_repl != NULL);
1957 if (subsys_repl != NULL) {
1958 /* register callback for reply */
1959 /* XXX we assume that client_loop has already been called */
1960 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1961 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1964 debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1965 channel_request_start(id, "exec", 0);
1967 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1970 channel_request_start(id, "shell", 0);
1976 client_init_dispatch_20(void)
1978 dispatch_init(&dispatch_protocol_error);
1980 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1981 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1982 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1983 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1984 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1985 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1986 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1987 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1988 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
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);
1999 client_init_dispatch_13(void)
2001 dispatch_init(NULL);
2002 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2003 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2004 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2005 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2006 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2007 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2008 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2009 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2010 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2012 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2013 &client_input_agent_open : &deny_input_open);
2014 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2015 &x11_input_open : &deny_input_open);
2018 client_init_dispatch_15(void)
2020 client_init_dispatch_13();
2021 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2022 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2025 client_init_dispatch(void)
2028 client_init_dispatch_20();
2030 client_init_dispatch_13();
2032 client_init_dispatch_15();
2035 /* client specific fatal cleanup */
2040 leave_non_blocking();
2041 if (options.control_path != NULL && control_fd != -1)
2042 unlink(options.control_path);