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>
102 #include "readconf.h"
103 #include "clientloop.h"
104 #include "sshconnect.h"
106 #include "atomicio.h"
109 #include "monitor_fdpass.h"
114 extern Options options;
116 /* Flag indicating that stdin should be redirected from /dev/null. */
117 extern int stdin_null_flag;
119 /* Flag indicating that no shell has been requested */
120 extern int no_shell_flag;
123 extern int control_fd;
126 * Name of the host we are connecting to. This is the name given on the
127 * command line, or the HostName specified for the user-supplied name in a
128 * configuration file.
133 * Flag to indicate that we have received a window change signal which has
134 * not yet been processed. This will cause a message indicating the new
135 * window size to be sent to the server a little later. This is volatile
136 * because this is updated in a signal handler.
138 static volatile sig_atomic_t received_window_change_signal = 0;
139 static volatile sig_atomic_t received_signal = 0;
141 /* Flag indicating whether the user's terminal is in non-blocking mode. */
142 static int in_non_blocking_mode = 0;
144 /* Common data for the client loop code. */
145 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
146 static int escape_char; /* Escape character. */
147 static int escape_pending; /* Last character was the escape character */
148 static int last_was_cr; /* Last character was a newline. */
149 static int exit_status; /* Used to store the exit status of the command. */
150 static int stdin_eof; /* EOF has been encountered on standard error. */
151 static Buffer stdin_buffer; /* Buffer for stdin data. */
152 static Buffer stdout_buffer; /* Buffer for stdout data. */
153 static Buffer stderr_buffer; /* Buffer for stderr data. */
154 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
155 static u_int buffer_high;/* Soft max buffer size. */
156 static int connection_in; /* Connection to server (input). */
157 static int connection_out; /* Connection to server (output). */
158 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
159 static int session_closed = 0; /* In SSH2: login session closed. */
160 static int server_alive_timeouts = 0;
162 static void client_init_dispatch(void);
163 int session_ident = -1;
179 void ssh_process_session2_setup(int, int, int, Buffer *);
181 /* Restores stdin to blocking mode. */
184 leave_non_blocking(void)
186 if (in_non_blocking_mode) {
187 unset_nonblock(fileno(stdin));
188 in_non_blocking_mode = 0;
192 /* Puts stdin terminal in non-blocking mode. */
195 enter_non_blocking(void)
197 in_non_blocking_mode = 1;
198 set_nonblock(fileno(stdin));
202 * Signal handler for the window change signal (SIGWINCH). This just sets a
203 * flag indicating that the window has changed.
207 window_change_handler(int sig)
209 received_window_change_signal = 1;
210 signal(SIGWINCH, window_change_handler);
214 * Signal handler for signals that cause the program to terminate. These
215 * signals must be trapped to restore terminal modes.
219 signal_handler(int sig)
221 received_signal = sig;
226 * Returns current time in seconds from Jan 1, 1970 with the maximum
227 * available resolution.
231 get_current_time(void)
234 gettimeofday(&tv, NULL);
235 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
238 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
240 client_x11_get_proto(const char *display, const char *xauth_path,
241 u_int trusted, char **_proto, char **_data)
246 static char proto[512], data[512];
248 int got_data = 0, generated = 0, do_unlink = 0, i;
249 char *xauthdir, *xauthfile;
252 xauthdir = xauthfile = NULL;
255 proto[0] = data[0] = '\0';
257 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
258 debug("No xauth program.");
260 if (display == NULL) {
261 debug("x11_get_proto: DISPLAY not set");
265 * Handle FamilyLocal case where $DISPLAY does
266 * not match an authorization entry. For this we
267 * just try "xauth list unix:displaynum.screennum".
268 * XXX: "localhost" match to determine FamilyLocal
271 if (strncmp(display, "localhost:", 10) == 0) {
272 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
277 xauthdir = xmalloc(MAXPATHLEN);
278 xauthfile = xmalloc(MAXPATHLEN);
279 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
280 if (mkdtemp(xauthdir) != NULL) {
282 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
284 snprintf(cmd, sizeof(cmd),
285 "%s -f %s generate %s " SSH_X11_PROTO
286 " untrusted timeout 1200 2>" _PATH_DEVNULL,
287 xauth_path, xauthfile, display);
288 debug2("x11_get_proto: %s", cmd);
289 if (system(cmd) == 0)
293 snprintf(cmd, sizeof(cmd),
294 "%s %s%s list %s 2>" _PATH_DEVNULL,
296 generated ? "-f " : "" ,
297 generated ? xauthfile : "",
299 debug2("x11_get_proto: %s", cmd);
301 if (f && fgets(line, sizeof(line), f) &&
302 sscanf(line, "%*s %511s %511s", proto, data) == 2)
318 * If we didn't get authentication data, just make up some
319 * data. The forwarding code will check the validity of the
320 * response anyway, and substitute this data. The X11
321 * server, however, will ignore this fake data and use
322 * whatever authentication mechanisms it was using otherwise
323 * for the local connection.
328 logit("Warning: No xauth data; "
329 "using fake authentication data for X11 forwarding.");
330 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
331 for (i = 0; i < 16; i++) {
334 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
342 * This is called when the interactive is entered. This checks if there is
343 * an EOF coming on stdin. We must check this explicitly, as select() does
344 * not appear to wake up when redirecting from /dev/null.
348 client_check_initial_eof_on_stdin(void)
354 * If standard input is to be "redirected from /dev/null", we simply
355 * mark that we have seen an EOF and send an EOF message to the
356 * server. Otherwise, we try to read a single character; it appears
357 * that for some files, such /dev/null, select() never wakes up for
358 * read for this descriptor, which means that we never get EOF. This
359 * way we will get the EOF if stdin comes from /dev/null or similar.
361 if (stdin_null_flag) {
362 /* Fake EOF on stdin. */
363 debug("Sending eof.");
365 packet_start(SSH_CMSG_EOF);
368 enter_non_blocking();
370 /* Check for immediate EOF on stdin. */
371 len = read(fileno(stdin), buf, 1);
373 /* EOF. Record that we have seen it and send EOF to server. */
374 debug("Sending eof.");
376 packet_start(SSH_CMSG_EOF);
378 } else if (len > 0) {
380 * Got data. We must store the data in the buffer,
381 * and also process it as an escape character if
384 if ((u_char) buf[0] == escape_char)
387 buffer_append(&stdin_buffer, buf, 1);
389 leave_non_blocking();
395 * Make packets from buffered stdin data, and buffer them for sending to the
400 client_make_packets_from_stdin_data(void)
404 /* Send buffered stdin data to the server. */
405 while (buffer_len(&stdin_buffer) > 0 &&
406 packet_not_very_much_data_to_write()) {
407 len = buffer_len(&stdin_buffer);
408 /* Keep the packets at reasonable size. */
409 if (len > packet_get_maxsize())
410 len = packet_get_maxsize();
411 packet_start(SSH_CMSG_STDIN_DATA);
412 packet_put_string(buffer_ptr(&stdin_buffer), len);
414 buffer_consume(&stdin_buffer, len);
416 /* If we have a pending EOF, send it now. */
417 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
418 packet_start(SSH_CMSG_EOF);
425 * Checks if the client window has changed, and sends a packet about it to
426 * the server if so. The actual change is detected elsewhere (by a software
427 * interrupt on Unix); this just checks the flag and sends a message if
432 client_check_window_change(void)
436 if (! received_window_change_signal)
439 received_window_change_signal = 0;
441 debug2("client_check_window_change: changed");
444 channel_send_window_changes();
446 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
448 packet_start(SSH_CMSG_WINDOW_SIZE);
449 packet_put_int((u_int)ws.ws_row);
450 packet_put_int((u_int)ws.ws_col);
451 packet_put_int((u_int)ws.ws_xpixel);
452 packet_put_int((u_int)ws.ws_ypixel);
458 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
460 server_alive_timeouts = 0;
461 client_global_request_reply_fwd(type, seq, ctxt);
465 server_alive_check(void)
467 if (++server_alive_timeouts > options.server_alive_count_max)
468 packet_disconnect("Timeout, server not responding.");
469 packet_start(SSH2_MSG_GLOBAL_REQUEST);
470 packet_put_cstring("keepalive@openssh.com");
471 packet_put_char(1); /* boolean: want reply */
476 * Waits until the client can do something (some data becomes available on
477 * one of the file descriptors).
480 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
481 int *maxfdp, u_int *nallocp, int rekeying)
483 struct timeval tv, *tvp;
486 /* Add any selections by the channel mechanism. */
487 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
490 /* Read from the connection, unless our buffers are full. */
491 if (buffer_len(&stdout_buffer) < buffer_high &&
492 buffer_len(&stderr_buffer) < buffer_high &&
493 channel_not_very_much_buffered_data())
494 FD_SET(connection_in, *readsetp);
496 * Read from stdin, unless we have seen EOF or have very much
497 * buffered data to send to the server.
499 if (!stdin_eof && packet_not_very_much_data_to_write())
500 FD_SET(fileno(stdin), *readsetp);
502 /* Select stdout/stderr if have data in buffer. */
503 if (buffer_len(&stdout_buffer) > 0)
504 FD_SET(fileno(stdout), *writesetp);
505 if (buffer_len(&stderr_buffer) > 0)
506 FD_SET(fileno(stderr), *writesetp);
508 /* channel_prepare_select could have closed the last channel */
509 if (session_closed && !channel_still_open() &&
510 !packet_have_data_to_write()) {
511 /* clear mask since we did not call select() */
512 memset(*readsetp, 0, *nallocp);
513 memset(*writesetp, 0, *nallocp);
516 FD_SET(connection_in, *readsetp);
520 /* Select server connection if have data to write to the server. */
521 if (packet_have_data_to_write())
522 FD_SET(connection_out, *writesetp);
524 if (control_fd != -1)
525 FD_SET(control_fd, *readsetp);
528 * Wait for something to happen. This will suspend the process until
529 * some selected descriptor can be read, written, or has some other
533 if (options.server_alive_interval == 0 || !compat20)
536 tv.tv_sec = options.server_alive_interval;
540 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
545 * We have to clear the select masks, because we return.
546 * We have to return, because the mainloop checks for the flags
547 * set by the signal handlers.
549 memset(*readsetp, 0, *nallocp);
550 memset(*writesetp, 0, *nallocp);
554 /* Note: we might still have data in the buffers. */
555 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
556 buffer_append(&stderr_buffer, buf, strlen(buf));
559 server_alive_check();
563 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
565 /* Flush stdout and stderr buffers. */
566 if (buffer_len(bout) > 0)
567 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
568 if (buffer_len(berr) > 0)
569 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
574 * Free (and clear) the buffer to reduce the amount of data that gets
581 /* Send the suspend signal to the program itself. */
582 kill(getpid(), SIGTSTP);
584 /* Reset window sizes in case they have changed */
585 received_window_change_signal = 1;
587 /* OK, we have been continued by the user. Reinitialize buffers. */
596 client_process_net_input(fd_set *readset)
602 * Read input from the server, and add any such data to the buffer of
603 * the packet subsystem.
605 if (FD_ISSET(connection_in, readset)) {
606 /* Read as much as possible. */
607 len = read(connection_in, buf, sizeof(buf));
609 /* Received EOF. The remote host has closed the connection. */
610 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
612 buffer_append(&stderr_buffer, buf, strlen(buf));
617 * There is a kernel bug on Solaris that causes select to
618 * sometimes wake up even though there is no data available.
620 if (len < 0 && (errno == EAGAIN || errno == EINTR))
624 /* An error has encountered. Perhaps there is a network problem. */
625 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
626 host, strerror(errno));
627 buffer_append(&stderr_buffer, buf, strlen(buf));
631 packet_process_incoming(buf, len);
636 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
641 id = packet_get_int();
644 if ((c = channel_lookup(id)) == NULL) {
645 error("%s: no channel for id %d", __func__, id);
649 if (type == SSH2_MSG_CHANNEL_SUCCESS)
650 debug2("Request suceeded on channel %d", id);
651 else if (type == SSH2_MSG_CHANNEL_FAILURE) {
652 error("Request failed on channel %d", id);
658 client_extra_session2_setup(int id, void *arg)
660 struct confirm_ctx *cctx = arg;
666 fatal("%s: cctx == NULL", __func__);
667 if ((c = channel_lookup(id)) == NULL)
668 fatal("%s: no channel for id %d", __func__, id);
670 display = getenv("DISPLAY");
671 if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
673 /* Get reasonable local authentication information. */
674 client_x11_get_proto(display, options.xauth_location,
675 options.forward_x11_trusted, &proto, &data);
676 /* Request forwarding with authentication spoofing. */
677 debug("Requesting X11 forwarding with authentication spoofing.");
678 x11_request_forwarding_with_spoofing(id, display, proto, data);
679 /* XXX wait for reply */
682 if (cctx->want_agent_fwd && options.forward_agent) {
683 debug("Requesting authentication agent forwarding.");
684 channel_request_start(id, "auth-agent-req@openssh.com", 0);
688 client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
689 cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
690 client_subsystem_reply);
692 c->confirm_ctx = NULL;
693 buffer_free(&cctx->cmd);
695 if (cctx->env != NULL) {
696 for (i = 0; cctx->env[i] != NULL; i++)
704 client_process_control(fd_set *readset)
708 int client_fd, new_fd[3], ver, allowed;
710 struct sockaddr_storage addr;
711 struct confirm_ctx *cctx;
713 u_int i, len, env_len, command, flags;
717 int connect_port = 0;
718 char * listen_host = NULL;
719 char * connect_host = NULL;
722 * Accept connection on control socket
724 if (control_fd == -1 || !FD_ISSET(control_fd, readset))
727 memset(&addr, 0, sizeof(addr));
728 addrlen = sizeof(addr);
729 if ((client_fd = accept(control_fd,
730 (struct sockaddr*)&addr, &addrlen)) == -1) {
731 error("%s accept: %s", __func__, strerror(errno));
735 if (getpeereid(client_fd, &euid, &egid) < 0) {
736 error("%s getpeereid failed: %s", __func__, strerror(errno));
740 if ((euid != 0) && (getuid() != euid)) {
741 error("control mode uid mismatch: peer euid %u != uid %u",
742 (u_int) euid, (u_int) getuid());
747 unset_nonblock(client_fd);
751 if (ssh_msg_recv(client_fd, &m) == -1) {
752 error("%s: client msg_recv failed", __func__);
757 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
758 error("%s: wrong client version %d", __func__, ver);
765 command = buffer_get_int(&m);
766 flags = buffer_get_int(&m);
768 if (SSHMUX_FLAG_PORTFORWARD & flags)
770 listen_host = buffer_get_string(&m,NULL);
771 listen_port = buffer_get_int(&m);
772 connect_host = buffer_get_string(&m,NULL);
773 connect_port = buffer_get_int(&m);
778 case SSHMUX_COMMAND_OPEN:
779 if (options.control_master == SSHCTL_MASTER_ASK ||
780 options.control_master == SSHCTL_MASTER_AUTO_ASK)
781 allowed = ask_permission("Allow shared connection "
785 case SSHMUX_COMMAND_TERMINATE:
786 if (options.control_master == SSHCTL_MASTER_ASK ||
787 options.control_master == SSHCTL_MASTER_AUTO_ASK)
788 allowed = ask_permission("Terminate shared connection "
793 case SSHMUX_COMMAND_ALIVE_CHECK:
794 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
796 buffer_put_int(&m, allowed);
797 buffer_put_int(&m, getpid());
798 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
799 error("%s: client msg_send failed", __func__);
808 error("Unsupported command %d", command);
814 if (allowed && (SSHMUX_FLAG_PORTFORWARD & flags) && listen_host && connect_host)
819 fwd = &options.local_forwards[options.num_local_forwards++];
820 fwd->listen_host = xstrdup(listen_host);
821 fwd->listen_port = listen_port;
822 fwd->connect_host = xstrdup(connect_host);
823 fwd->connect_port = connect_port;
824 ret = channel_setup_local_fwd_listener(
825 options.local_forwards[options.num_local_forwards-1].listen_host,
826 options.local_forwards[options.num_local_forwards-1].listen_port,
827 options.local_forwards[options.num_local_forwards-1].connect_host,
828 options.local_forwards[options.num_local_forwards-1].connect_port,
829 options.gateway_ports, options.hpn_disabled, options.hpn_buffer_size);
839 /* Reply for SSHMUX_COMMAND_OPEN */
841 buffer_put_int(&m, allowed);
842 buffer_put_int(&m, getpid());
843 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
844 error("%s: client msg_send failed", __func__);
851 error("Refused control connection");
858 if (ssh_msg_recv(client_fd, &m) == -1) {
859 error("%s: client msg_recv failed", __func__);
864 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
865 error("%s: wrong client version %d", __func__, ver);
871 cctx = xcalloc(1, sizeof(*cctx));
872 cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
873 cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
874 cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
875 cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
876 cctx->term = buffer_get_string(&m, &len);
878 cmd = buffer_get_string(&m, &len);
879 buffer_init(&cctx->cmd);
880 buffer_append(&cctx->cmd, cmd, strlen(cmd));
882 env_len = buffer_get_int(&m);
883 env_len = MIN(env_len, 4096);
884 debug3("%s: receiving %d env vars", __func__, env_len);
886 cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
887 for (i = 0; i < env_len; i++)
888 cctx->env[i] = buffer_get_string(&m, &len);
892 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
893 cctx->want_tty, cctx->want_subsys, cmd);
896 /* Gather fds from client */
897 new_fd[0] = mm_receive_fd(client_fd);
898 new_fd[1] = mm_receive_fd(client_fd);
899 new_fd[2] = mm_receive_fd(client_fd);
901 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
902 new_fd[0], new_fd[1], new_fd[2]);
904 /* Try to pick up ttymodes from client before it goes raw */
905 if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
906 error("%s: tcgetattr: %s", __func__, strerror(errno));
908 /* This roundtrip is just for synchronisation of ttymodes */
910 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
911 error("%s: client msg_send failed", __func__);
919 for (i = 0; i < env_len; i++)
927 /* enable nonblocking unless tty */
928 if (!isatty(new_fd[0]))
929 set_nonblock(new_fd[0]);
930 if (!isatty(new_fd[1]))
931 set_nonblock(new_fd[1]);
932 if (!isatty(new_fd[2]))
933 set_nonblock(new_fd[2]);
935 set_nonblock(client_fd);
937 if (options.hpn_disabled)
938 c = channel_new("session", SSH_CHANNEL_OPENING,
939 new_fd[0], new_fd[1], new_fd[2],
940 CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
941 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
943 c = channel_new("session", SSH_CHANNEL_OPENING,
944 new_fd[0], new_fd[1], new_fd[2],
945 options.hpn_buffer_size, CHAN_SES_PACKET_DEFAULT,
946 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
948 c->ctl_fd = client_fd;
950 debug3("%s: channel_new: %d", __func__, c->self);
952 channel_send_open(c->self);
953 channel_register_confirm(c->self, client_extra_session2_setup, cctx);
957 process_cmdline(void)
959 void (*handler)(int);
960 char *s, *cmd, *cancel_host;
967 handler = signal(SIGINT, SIG_IGN);
968 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
971 while (*s && isspace(*s))
974 s++; /* Skip cmdline '-', if any */
978 if (*s == 'h' || *s == 'H' || *s == '?') {
980 logit(" -L[bind_address:]port:host:hostport "
981 "Request local forward");
982 logit(" -R[bind_address:]port:host:hostport "
983 "Request remote forward");
984 logit(" -KR[bind_address:]port "
985 "Cancel remote forward");
986 if (!options.permit_local_command)
989 "Execute local command");
993 if (*s == '!' && options.permit_local_command) {
1003 if (*s != 'L' && *s != 'R') {
1004 logit("Invalid command.");
1009 if (local && delete) {
1010 logit("Not supported.");
1013 if ((!local || delete) && !compat20) {
1014 logit("Not supported for SSH protocol version 1.");
1019 while (*s && isspace(*s))
1024 cancel_host = hpdelim(&s); /* may be NULL */
1026 cancel_port = a2port(s);
1027 cancel_host = cleanhostname(cancel_host);
1029 cancel_port = a2port(cancel_host);
1032 if (cancel_port == 0) {
1033 logit("Bad forwarding close port");
1036 channel_request_rforward_cancel(cancel_host, cancel_port);
1038 if (!parse_forward(&fwd, s)) {
1039 logit("Bad forwarding specification.");
1043 if (channel_setup_local_fwd_listener(fwd.listen_host,
1044 fwd.listen_port, fwd.connect_host,
1045 fwd.connect_port, options.gateway_ports,
1046 options.hpn_disabled, options.hpn_buffer_size) < 0) {
1047 logit("Port forwarding failed.");
1051 if (channel_request_remote_forwarding(fwd.listen_host,
1052 fwd.listen_port, fwd.connect_host,
1053 fwd.connect_port) < 0) {
1054 logit("Port forwarding failed.");
1059 logit("Forwarding port.");
1063 signal(SIGINT, handler);
1069 /* process the characters one by one */
1071 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1083 for (i = 0; i < (u_int)len; i++) {
1084 /* Get one character at a time. */
1087 if (escape_pending) {
1088 /* We have previously seen an escape character. */
1089 /* Clear the flag now. */
1092 /* Process the escaped character. */
1095 /* Terminate the connection. */
1096 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1097 buffer_append(berr, string, strlen(string));
1103 /* Suspend the program. */
1104 /* Print a message to that effect to the user. */
1105 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1106 buffer_append(berr, string, strlen(string));
1108 /* Restore terminal modes and suspend. */
1109 client_suspend_self(bin, bout, berr);
1111 /* We have been continued. */
1116 snprintf(string, sizeof string,
1117 "%cB\r\n", escape_char);
1118 buffer_append(berr, string,
1120 channel_request_start(session_ident,
1122 packet_put_int(1000);
1129 if (datafellows & SSH_BUG_NOREKEY)
1130 logit("Server does not support re-keying");
1138 * Detach the program (continue to serve connections,
1139 * but put in background and no more new connections).
1141 /* Restore tty modes. */
1144 /* Stop listening for new connections. */
1145 channel_stop_listening();
1147 snprintf(string, sizeof string,
1148 "%c& [backgrounded]\n", escape_char);
1149 buffer_append(berr, string, strlen(string));
1151 /* Fork into background. */
1154 error("fork: %.100s", strerror(errno));
1157 if (pid != 0) { /* This is the parent. */
1158 /* The parent just exits. */
1161 /* The child continues serving connections. */
1163 buffer_append(bin, "\004", 1);
1164 /* fake EOF on stdin */
1166 } else if (!stdin_eof) {
1168 * Sending SSH_CMSG_EOF alone does not always appear
1169 * to be enough. So we try to send an EOF character
1172 packet_start(SSH_CMSG_STDIN_DATA);
1173 packet_put_string("\004", 1);
1177 if (buffer_len(bin) == 0) {
1178 packet_start(SSH_CMSG_EOF);
1185 snprintf(string, sizeof string,
1187 Supported escape sequences:\r\n\
1188 %c. - terminate connection\r\n\
1189 %cB - send a BREAK to the remote system\r\n\
1190 %cC - open a command line\r\n\
1191 %cR - Request rekey (SSH protocol 2 only)\r\n\
1192 %c^Z - suspend ssh\r\n\
1193 %c# - list forwarded connections\r\n\
1194 %c& - background ssh (when waiting for connections to terminate)\r\n\
1195 %c? - this message\r\n\
1196 %c%c - send the escape character by typing it twice\r\n\
1197 (Note that escapes are only recognized immediately after newline.)\r\n",
1198 escape_char, escape_char, escape_char, escape_char,
1199 escape_char, escape_char, escape_char, escape_char,
1200 escape_char, escape_char, escape_char);
1201 buffer_append(berr, string, strlen(string));
1205 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1206 buffer_append(berr, string, strlen(string));
1207 s = channel_open_message();
1208 buffer_append(berr, s, strlen(s));
1217 if (ch != escape_char) {
1218 buffer_put_char(bin, escape_char);
1221 /* Escaped characters fall through here */
1226 * The previous character was not an escape char. Check if this
1229 if (last_was_cr && ch == escape_char) {
1230 /* It is. Set the flag and continue to next character. */
1237 * Normal character. Record whether it was a newline,
1238 * and append it to the buffer.
1240 last_was_cr = (ch == '\r' || ch == '\n');
1241 buffer_put_char(bin, ch);
1248 client_process_input(fd_set *readset)
1253 /* Read input from stdin. */
1254 if (FD_ISSET(fileno(stdin), readset)) {
1255 /* Read as much as possible. */
1256 len = read(fileno(stdin), buf, sizeof(buf));
1257 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1258 return; /* we'll try again later */
1261 * Received EOF or error. They are treated
1262 * similarly, except that an error message is printed
1263 * if it was an error condition.
1266 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1267 buffer_append(&stderr_buffer, buf, strlen(buf));
1269 /* Mark that we have seen EOF. */
1272 * Send an EOF message to the server unless there is
1273 * data in the buffer. If there is data in the
1274 * buffer, no message will be sent now. Code
1275 * elsewhere will send the EOF when the buffer
1276 * becomes empty if stdin_eof is set.
1278 if (buffer_len(&stdin_buffer) == 0) {
1279 packet_start(SSH_CMSG_EOF);
1282 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1284 * Normal successful read, and no escape character.
1285 * Just append the data to buffer.
1287 buffer_append(&stdin_buffer, buf, len);
1290 * Normal, successful read. But we have an escape character
1291 * and have to process the characters one by one.
1293 if (process_escapes(&stdin_buffer, &stdout_buffer,
1294 &stderr_buffer, buf, len) == -1)
1301 client_process_output(fd_set *writeset)
1306 /* Write buffered output to stdout. */
1307 if (FD_ISSET(fileno(stdout), writeset)) {
1308 /* Write as much data as possible. */
1309 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1310 buffer_len(&stdout_buffer));
1312 if (errno == EINTR || errno == EAGAIN)
1316 * An error or EOF was encountered. Put an
1317 * error message to stderr buffer.
1319 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1320 buffer_append(&stderr_buffer, buf, strlen(buf));
1325 /* Consume printed data from the buffer. */
1326 buffer_consume(&stdout_buffer, len);
1327 stdout_bytes += len;
1329 /* Write buffered output to stderr. */
1330 if (FD_ISSET(fileno(stderr), writeset)) {
1331 /* Write as much data as possible. */
1332 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1333 buffer_len(&stderr_buffer));
1335 if (errno == EINTR || errno == EAGAIN)
1338 /* EOF or error, but can't even print error message. */
1343 /* Consume printed characters from the buffer. */
1344 buffer_consume(&stderr_buffer, len);
1345 stderr_bytes += len;
1350 * Get packets from the connection input buffer, and process them as long as
1351 * there are packets available.
1353 * Any unknown packets received during the actual
1354 * session cause the session to terminate. This is
1355 * intended to make debugging easier since no
1356 * confirmations are sent. Any compatible protocol
1357 * extensions must be negotiated during the
1358 * preparatory phase.
1362 client_process_buffered_input_packets(void)
1364 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1367 /* scan buf[] for '~' before sending data to the peer */
1370 simple_escape_filter(Channel *c, char *buf, int len)
1372 /* XXX we assume c->extended is writeable */
1373 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1377 client_channel_closed(int id, void *arg)
1379 channel_cancel_cleanup(id);
1385 * Implements the interactive session with the server. This is called after
1386 * the user has been authenticated, and a command has been started on the
1387 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1388 * used as an escape character for terminating or suspending the session.
1392 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1394 fd_set *readset = NULL, *writeset = NULL;
1395 double start_time, total_time;
1396 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1400 debug("Entering interactive session.");
1402 start_time = get_current_time();
1404 /* Initialize variables. */
1409 buffer_high = 64 * 1024;
1410 connection_in = packet_get_connection_in();
1411 connection_out = packet_get_connection_out();
1412 max_fd = MAX(connection_in, connection_out);
1413 if (control_fd != -1)
1414 max_fd = MAX(max_fd, control_fd);
1417 /* enable nonblocking unless tty */
1418 if (!isatty(fileno(stdin)))
1419 set_nonblock(fileno(stdin));
1420 if (!isatty(fileno(stdout)))
1421 set_nonblock(fileno(stdout));
1422 if (!isatty(fileno(stderr)))
1423 set_nonblock(fileno(stderr));
1424 max_fd = MAX(max_fd, fileno(stdin));
1425 max_fd = MAX(max_fd, fileno(stdout));
1426 max_fd = MAX(max_fd, fileno(stderr));
1432 escape_char = escape_char_arg;
1434 /* Initialize buffers. */
1435 buffer_init(&stdin_buffer);
1436 buffer_init(&stdout_buffer);
1437 buffer_init(&stderr_buffer);
1439 client_init_dispatch();
1442 * Set signal handlers, (e.g. to restore non-blocking mode)
1443 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1445 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1446 signal(SIGHUP, signal_handler);
1447 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1448 signal(SIGINT, signal_handler);
1449 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1450 signal(SIGQUIT, signal_handler);
1451 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1452 signal(SIGTERM, signal_handler);
1453 signal(SIGWINCH, window_change_handler);
1459 session_ident = ssh2_chan_id;
1460 if (escape_char != SSH_ESCAPECHAR_NONE)
1461 channel_register_filter(session_ident,
1462 simple_escape_filter, NULL);
1463 if (session_ident != -1)
1464 channel_register_cleanup(session_ident,
1465 client_channel_closed, 0);
1467 /* Check if we should immediately send eof on stdin. */
1468 client_check_initial_eof_on_stdin();
1471 /* Main loop of the client for the interactive session mode. */
1472 while (!quit_pending) {
1474 /* Process buffered packets sent by the server. */
1475 client_process_buffered_input_packets();
1477 if (compat20 && session_closed && !channel_still_open())
1480 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1483 debug("rekeying in progress");
1486 * Make packets of buffered stdin data, and buffer
1487 * them for sending to the server.
1490 client_make_packets_from_stdin_data();
1493 * Make packets from buffered channel data, and
1494 * enqueue them for sending to the server.
1496 if (packet_not_very_much_data_to_write())
1497 channel_output_poll();
1500 * Check if the window size has changed, and buffer a
1501 * message about it to the server if so.
1503 client_check_window_change();
1509 * Wait until we have something to do (something becomes
1510 * available on one of the descriptors).
1513 client_wait_until_can_do_something(&readset, &writeset,
1514 &max_fd2, &nalloc, rekeying);
1519 /* Do channel operations unless rekeying in progress. */
1521 channel_after_select(readset, writeset);
1522 if (need_rekeying || packet_need_rekeying()) {
1523 debug("need rekeying");
1525 kex_send_kexinit(xxx_kex);
1530 /* Buffer input from the connection. */
1531 client_process_net_input(readset);
1533 /* Accept control connections. */
1534 client_process_control(readset);
1540 /* Buffer data from stdin */
1541 client_process_input(readset);
1543 * Process output to stdout and stderr. Output to
1544 * the connection is processed elsewhere (above).
1546 client_process_output(writeset);
1549 /* Send as much buffered packet data as possible to the sender. */
1550 if (FD_ISSET(connection_out, writeset))
1551 packet_write_poll();
1558 /* Terminate the session. */
1560 /* Stop watching for window change. */
1561 signal(SIGWINCH, SIG_DFL);
1568 /* restore blocking io */
1569 if (!isatty(fileno(stdin)))
1570 unset_nonblock(fileno(stdin));
1571 if (!isatty(fileno(stdout)))
1572 unset_nonblock(fileno(stdout));
1573 if (!isatty(fileno(stderr)))
1574 unset_nonblock(fileno(stderr));
1577 * If there was no shell or command requested, there will be no remote
1578 * exit status to be returned. In that case, clear error code if the
1579 * connection was deliberately terminated at this end.
1581 if (no_shell_flag && received_signal == SIGTERM) {
1582 received_signal = 0;
1586 if (received_signal)
1587 fatal("Killed by signal %d.", (int) received_signal);
1590 * In interactive mode (with pseudo tty) display a message indicating
1591 * that the connection has been closed.
1593 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1594 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1595 buffer_append(&stderr_buffer, buf, strlen(buf));
1598 /* Output any buffered data for stdout. */
1599 while (buffer_len(&stdout_buffer) > 0) {
1600 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1601 buffer_len(&stdout_buffer));
1603 error("Write failed flushing stdout buffer.");
1606 buffer_consume(&stdout_buffer, len);
1607 stdout_bytes += len;
1610 /* Output any buffered data for stderr. */
1611 while (buffer_len(&stderr_buffer) > 0) {
1612 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1613 buffer_len(&stderr_buffer));
1615 error("Write failed flushing stderr buffer.");
1618 buffer_consume(&stderr_buffer, len);
1619 stderr_bytes += len;
1622 /* Clear and free any buffers. */
1623 memset(buf, 0, sizeof(buf));
1624 buffer_free(&stdin_buffer);
1625 buffer_free(&stdout_buffer);
1626 buffer_free(&stderr_buffer);
1628 /* Report bytes transferred, and transfer rates. */
1629 total_time = get_current_time() - start_time;
1630 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1631 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1633 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1634 stdin_bytes / total_time, stdout_bytes / total_time,
1635 stderr_bytes / total_time);
1637 /* Return the exit status of the program. */
1638 debug("Exit status %d", exit_status);
1645 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1648 char *data = packet_get_string(&data_len);
1650 buffer_append(&stdout_buffer, data, data_len);
1651 memset(data, 0, data_len);
1655 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1658 char *data = packet_get_string(&data_len);
1660 buffer_append(&stderr_buffer, data, data_len);
1661 memset(data, 0, data_len);
1665 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1667 exit_status = packet_get_int();
1669 /* Acknowledge the exit. */
1670 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1673 * Must wait for packet to be sent since we are
1676 packet_write_wait();
1677 /* Flag that we want to exit. */
1681 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1684 int remote_id, sock;
1686 /* Read the remote channel number from the message. */
1687 remote_id = packet_get_int();
1691 * Get a connection to the local authentication agent (this may again
1694 sock = ssh_get_authentication_socket();
1697 * If we could not connect the agent, send an error message back to
1698 * the server. This should never happen unless the agent dies,
1699 * because authentication forwarding is only enabled if we have an
1703 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1704 -1, 0, 0, 0, "authentication agent connection", 1);
1705 c->remote_id = remote_id;
1709 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1710 packet_put_int(remote_id);
1712 /* Send a confirmation to the remote host. */
1713 debug("Forwarding authentication connection.");
1714 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1715 packet_put_int(remote_id);
1716 packet_put_int(c->self);
1722 client_request_forwarded_tcpip(const char *request_type, int rchan)
1725 char *listen_address, *originator_address;
1726 int listen_port, originator_port;
1729 /* Get rest of the packet */
1730 listen_address = packet_get_string(NULL);
1731 listen_port = packet_get_int();
1732 originator_address = packet_get_string(NULL);
1733 originator_port = packet_get_int();
1736 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1737 listen_address, listen_port, originator_address, originator_port);
1739 sock = channel_connect_by_listen_address(listen_port);
1741 xfree(originator_address);
1742 xfree(listen_address);
1745 if (options.hpn_disabled)
1746 c = channel_new("forwarded-tcpip",
1747 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1748 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1749 originator_address, 1);
1751 c = channel_new("forwarded-tcpip",
1752 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1753 options.hpn_buffer_size, options.hpn_buffer_size, 0,
1754 originator_address, 1);
1755 xfree(originator_address);
1756 xfree(listen_address);
1761 client_request_x11(const char *request_type, int rchan)
1765 int originator_port;
1768 if (!options.forward_x11) {
1769 error("Warning: ssh server tried X11 forwarding.");
1770 error("Warning: this is probably a break-in attempt by a malicious server.");
1773 originator = packet_get_string(NULL);
1774 if (datafellows & SSH_BUG_X11FWD) {
1775 debug2("buggy server: x11 request w/o originator_port");
1776 originator_port = 0;
1778 originator_port = packet_get_int();
1781 /* XXX check permission */
1782 debug("client_request_x11: request from %s %d", originator,
1785 sock = x11_connect_display();
1788 if (options.hpn_disabled)
1789 c = channel_new("x11",
1790 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1791 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1793 c = channel_new("x11",
1794 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1795 options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1801 client_request_agent(const char *request_type, int rchan)
1806 if (!options.forward_agent) {
1807 error("Warning: ssh server tried agent forwarding.");
1808 error("Warning: this is probably a break-in attempt by a malicious server.");
1811 sock = ssh_get_authentication_socket();
1814 if (options.hpn_disabled)
1815 c = channel_new("authentication agent connection",
1816 SSH_CHANNEL_OPEN, sock, sock, -1,
1817 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1818 "authentication agent connection", 1);
1820 c = channel_new("authentication agent connection",
1821 SSH_CHANNEL_OPEN, sock, sock, -1,
1822 options.hpn_buffer_size, options.hpn_buffer_size, 0,
1823 "authentication agent connection", 1);
1828 /* XXXX move to generic input handler */
1830 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1835 u_int rmaxpack, rwindow, len;
1837 ctype = packet_get_string(&len);
1838 rchan = packet_get_int();
1839 rwindow = packet_get_int();
1840 rmaxpack = packet_get_int();
1842 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1843 ctype, rchan, rwindow, rmaxpack);
1845 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1846 c = client_request_forwarded_tcpip(ctype, rchan);
1847 } else if (strcmp(ctype, "x11") == 0) {
1848 c = client_request_x11(ctype, rchan);
1849 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1850 c = client_request_agent(ctype, rchan);
1852 /* XXX duplicate : */
1854 debug("confirm %s", ctype);
1855 c->remote_id = rchan;
1856 c->remote_window = rwindow;
1857 c->remote_maxpacket = rmaxpack;
1858 if (c->type != SSH_CHANNEL_CONNECTING) {
1859 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1860 packet_put_int(c->remote_id);
1861 packet_put_int(c->self);
1862 packet_put_int(c->local_window);
1863 packet_put_int(c->local_maxpacket);
1867 debug("failure %s", ctype);
1868 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1869 packet_put_int(rchan);
1870 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1871 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1872 packet_put_cstring("open failed");
1873 packet_put_cstring("");
1880 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1883 int exitval, id, reply, success = 0;
1886 id = packet_get_int();
1887 rtype = packet_get_string(NULL);
1888 reply = packet_get_char();
1890 debug("client_input_channel_req: channel %d rtype %s reply %d",
1894 error("client_input_channel_req: request for channel -1");
1895 } else if ((c = channel_lookup(id)) == NULL) {
1896 error("client_input_channel_req: channel %d: unknown channel", id);
1897 } else if (strcmp(rtype, "exit-status") == 0) {
1898 exitval = packet_get_int();
1899 if (id == session_ident) {
1901 exit_status = exitval;
1902 } else if (c->ctl_fd == -1) {
1903 error("client_input_channel_req: unexpected channel %d",
1906 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1912 packet_start(success ?
1913 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1920 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1926 rtype = packet_get_string(NULL);
1927 want_reply = packet_get_char();
1928 debug("client_input_global_request: rtype %s want_reply %d",
1931 packet_start(success ?
1932 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1934 packet_write_wait();
1940 client_session2_setup(int id, int want_tty, int want_subsystem,
1941 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1942 dispatch_fn *subsys_repl)
1947 debug2("%s: id %d", __func__, id);
1949 if ((c = channel_lookup(id)) == NULL)
1950 fatal("client_session2_setup: channel %d: unknown channel", id);
1956 /* Store window size in the packet. */
1957 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1958 memset(&ws, 0, sizeof(ws));
1960 channel_request_start(id, "pty-req", 0);
1961 packet_put_cstring(term != NULL ? term : "");
1962 packet_put_int((u_int)ws.ws_col);
1963 packet_put_int((u_int)ws.ws_row);
1964 packet_put_int((u_int)ws.ws_xpixel);
1965 packet_put_int((u_int)ws.ws_ypixel);
1966 tio = get_saved_tio();
1967 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1969 /* XXX wait for reply */
1973 /* Transfer any environment variables from client to server */
1974 if (options.num_send_env != 0 && env != NULL) {
1978 debug("Sending environment.");
1979 for (i = 0; env[i] != NULL; i++) {
1981 name = xstrdup(env[i]);
1982 if ((val = strchr(name, '=')) == NULL) {
1989 for (j = 0; j < options.num_send_env; j++) {
1990 if (match_pattern(name, options.send_env[j])) {
1996 debug3("Ignored env %s", name);
2001 debug("Sending env %s = %s", name, val);
2002 channel_request_start(id, "env", 0);
2003 packet_put_cstring(name);
2004 packet_put_cstring(val);
2010 len = buffer_len(cmd);
2014 if (want_subsystem) {
2015 debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
2016 channel_request_start(id, "subsystem", subsys_repl != NULL);
2017 if (subsys_repl != NULL) {
2018 /* register callback for reply */
2019 /* XXX we assume that client_loop has already been called */
2020 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
2021 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
2024 debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
2025 channel_request_start(id, "exec", 0);
2027 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2030 channel_request_start(id, "shell", 0);
2036 client_init_dispatch_20(void)
2038 dispatch_init(&dispatch_protocol_error);
2040 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2041 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2042 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2043 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2044 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2045 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2046 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2047 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2048 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2049 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2052 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2054 /* global request reply messages */
2055 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2056 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2059 client_init_dispatch_13(void)
2061 dispatch_init(NULL);
2062 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2063 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2064 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2065 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2066 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2067 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2068 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2069 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2070 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2072 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2073 &client_input_agent_open : &deny_input_open);
2074 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2075 &x11_input_open : &deny_input_open);
2078 client_init_dispatch_15(void)
2080 client_init_dispatch_13();
2081 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2082 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2085 client_init_dispatch(void)
2088 client_init_dispatch_20();
2090 client_init_dispatch_13();
2092 client_init_dispatch_15();
2095 /* client specific fatal cleanup */
2100 leave_non_blocking();
2101 if (options.control_path != NULL && control_fd != -1)
2102 unlink(options.control_path);