1 /* $OpenBSD: clientloop.c,v 1.172 2006/07/26 02:35:17 stevesk Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * The main loop for the interactive session (client side).
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
15 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 * SSH2 support added by Markus Friedl.
39 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
50 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
64 #include <sys/types.h>
65 #include <sys/ioctl.h>
66 #include <sys/param.h>
67 #ifdef HAVE_SYS_STAT_H
68 # include <sys/stat.h>
70 #ifdef HAVE_SYS_TIME_H
71 # include <sys/time.h>
73 #include <sys/socket.h>
100 #include "clientloop.h"
101 #include "sshconnect.h"
103 #include "atomicio.h"
106 #include "monitor_fdpass.h"
111 extern Options options;
113 /* Flag indicating that stdin should be redirected from /dev/null. */
114 extern int stdin_null_flag;
116 /* Flag indicating that no shell has been requested */
117 extern int no_shell_flag;
120 extern int control_fd;
123 * Name of the host we are connecting to. This is the name given on the
124 * command line, or the HostName specified for the user-supplied name in a
125 * configuration file.
130 * Flag to indicate that we have received a window change signal which has
131 * not yet been processed. This will cause a message indicating the new
132 * window size to be sent to the server a little later. This is volatile
133 * because this is updated in a signal handler.
135 static volatile sig_atomic_t received_window_change_signal = 0;
136 static volatile sig_atomic_t received_signal = 0;
138 /* Flag indicating whether the user's terminal is in non-blocking mode. */
139 static int in_non_blocking_mode = 0;
141 /* Common data for the client loop code. */
142 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
143 static int escape_char; /* Escape character. */
144 static int escape_pending; /* Last character was the escape character */
145 static int last_was_cr; /* Last character was a newline. */
146 static int exit_status; /* Used to store the exit status of the command. */
147 static int stdin_eof; /* EOF has been encountered on standard error. */
148 static Buffer stdin_buffer; /* Buffer for stdin data. */
149 static Buffer stdout_buffer; /* Buffer for stdout data. */
150 static Buffer stderr_buffer; /* Buffer for stderr data. */
151 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
152 static u_int buffer_high;/* Soft max buffer size. */
153 static int connection_in; /* Connection to server (input). */
154 static int connection_out; /* Connection to server (output). */
155 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
156 static int session_closed = 0; /* In SSH2: login session closed. */
157 static int server_alive_timeouts = 0;
159 static void client_init_dispatch(void);
160 int session_ident = -1;
176 void ssh_process_session2_setup(int, int, int, Buffer *);
178 /* Restores stdin to blocking mode. */
181 leave_non_blocking(void)
183 if (in_non_blocking_mode) {
184 unset_nonblock(fileno(stdin));
185 in_non_blocking_mode = 0;
189 /* Puts stdin terminal in non-blocking mode. */
192 enter_non_blocking(void)
194 in_non_blocking_mode = 1;
195 set_nonblock(fileno(stdin));
199 * Signal handler for the window change signal (SIGWINCH). This just sets a
200 * flag indicating that the window has changed.
204 window_change_handler(int sig)
206 received_window_change_signal = 1;
207 signal(SIGWINCH, window_change_handler);
211 * Signal handler for signals that cause the program to terminate. These
212 * signals must be trapped to restore terminal modes.
216 signal_handler(int sig)
218 received_signal = sig;
223 * Returns current time in seconds from Jan 1, 1970 with the maximum
224 * available resolution.
228 get_current_time(void)
231 gettimeofday(&tv, NULL);
232 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
235 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
237 client_x11_get_proto(const char *display, const char *xauth_path,
238 u_int trusted, char **_proto, char **_data)
243 static char proto[512], data[512];
245 int got_data = 0, generated = 0, do_unlink = 0, i;
246 char *xauthdir, *xauthfile;
249 xauthdir = xauthfile = NULL;
252 proto[0] = data[0] = '\0';
254 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
255 debug("No xauth program.");
257 if (display == NULL) {
258 debug("x11_get_proto: DISPLAY not set");
262 * Handle FamilyLocal case where $DISPLAY does
263 * not match an authorization entry. For this we
264 * just try "xauth list unix:displaynum.screennum".
265 * XXX: "localhost" match to determine FamilyLocal
268 if (strncmp(display, "localhost:", 10) == 0) {
269 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
274 xauthdir = xmalloc(MAXPATHLEN);
275 xauthfile = xmalloc(MAXPATHLEN);
276 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
277 if (mkdtemp(xauthdir) != NULL) {
279 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
281 snprintf(cmd, sizeof(cmd),
282 "%s -f %s generate %s " SSH_X11_PROTO
283 " untrusted timeout 1200 2>" _PATH_DEVNULL,
284 xauth_path, xauthfile, display);
285 debug2("x11_get_proto: %s", cmd);
286 if (system(cmd) == 0)
290 snprintf(cmd, sizeof(cmd),
291 "%s %s%s list %s 2>" _PATH_DEVNULL,
293 generated ? "-f " : "" ,
294 generated ? xauthfile : "",
296 debug2("x11_get_proto: %s", cmd);
298 if (f && fgets(line, sizeof(line), f) &&
299 sscanf(line, "%*s %511s %511s", proto, data) == 2)
315 * If we didn't get authentication data, just make up some
316 * data. The forwarding code will check the validity of the
317 * response anyway, and substitute this data. The X11
318 * server, however, will ignore this fake data and use
319 * whatever authentication mechanisms it was using otherwise
320 * for the local connection.
325 logit("Warning: No xauth data; "
326 "using fake authentication data for X11 forwarding.");
327 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
328 for (i = 0; i < 16; i++) {
331 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
339 * This is called when the interactive is entered. This checks if there is
340 * an EOF coming on stdin. We must check this explicitly, as select() does
341 * not appear to wake up when redirecting from /dev/null.
345 client_check_initial_eof_on_stdin(void)
351 * If standard input is to be "redirected from /dev/null", we simply
352 * mark that we have seen an EOF and send an EOF message to the
353 * server. Otherwise, we try to read a single character; it appears
354 * that for some files, such /dev/null, select() never wakes up for
355 * read for this descriptor, which means that we never get EOF. This
356 * way we will get the EOF if stdin comes from /dev/null or similar.
358 if (stdin_null_flag) {
359 /* Fake EOF on stdin. */
360 debug("Sending eof.");
362 packet_start(SSH_CMSG_EOF);
365 enter_non_blocking();
367 /* Check for immediate EOF on stdin. */
368 len = read(fileno(stdin), buf, 1);
370 /* EOF. Record that we have seen it and send EOF to server. */
371 debug("Sending eof.");
373 packet_start(SSH_CMSG_EOF);
375 } else if (len > 0) {
377 * Got data. We must store the data in the buffer,
378 * and also process it as an escape character if
381 if ((u_char) buf[0] == escape_char)
384 buffer_append(&stdin_buffer, buf, 1);
386 leave_non_blocking();
392 * Make packets from buffered stdin data, and buffer them for sending to the
397 client_make_packets_from_stdin_data(void)
401 /* Send buffered stdin data to the server. */
402 while (buffer_len(&stdin_buffer) > 0 &&
403 packet_not_very_much_data_to_write()) {
404 len = buffer_len(&stdin_buffer);
405 /* Keep the packets at reasonable size. */
406 if (len > packet_get_maxsize())
407 len = packet_get_maxsize();
408 packet_start(SSH_CMSG_STDIN_DATA);
409 packet_put_string(buffer_ptr(&stdin_buffer), len);
411 buffer_consume(&stdin_buffer, len);
413 /* If we have a pending EOF, send it now. */
414 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
415 packet_start(SSH_CMSG_EOF);
422 * Checks if the client window has changed, and sends a packet about it to
423 * the server if so. The actual change is detected elsewhere (by a software
424 * interrupt on Unix); this just checks the flag and sends a message if
429 client_check_window_change(void)
433 if (! received_window_change_signal)
436 received_window_change_signal = 0;
438 debug2("client_check_window_change: changed");
441 channel_send_window_changes();
443 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
445 packet_start(SSH_CMSG_WINDOW_SIZE);
446 packet_put_int((u_int)ws.ws_row);
447 packet_put_int((u_int)ws.ws_col);
448 packet_put_int((u_int)ws.ws_xpixel);
449 packet_put_int((u_int)ws.ws_ypixel);
455 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
457 server_alive_timeouts = 0;
458 client_global_request_reply_fwd(type, seq, ctxt);
462 server_alive_check(void)
464 if (++server_alive_timeouts > options.server_alive_count_max)
465 packet_disconnect("Timeout, server not responding.");
466 packet_start(SSH2_MSG_GLOBAL_REQUEST);
467 packet_put_cstring("keepalive@openssh.com");
468 packet_put_char(1); /* boolean: want reply */
473 * Waits until the client can do something (some data becomes available on
474 * one of the file descriptors).
477 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
478 int *maxfdp, u_int *nallocp, int rekeying)
480 struct timeval tv, *tvp;
483 /* Add any selections by the channel mechanism. */
484 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
487 /* Read from the connection, unless our buffers are full. */
488 if (buffer_len(&stdout_buffer) < buffer_high &&
489 buffer_len(&stderr_buffer) < buffer_high &&
490 channel_not_very_much_buffered_data())
491 FD_SET(connection_in, *readsetp);
493 * Read from stdin, unless we have seen EOF or have very much
494 * buffered data to send to the server.
496 if (!stdin_eof && packet_not_very_much_data_to_write())
497 FD_SET(fileno(stdin), *readsetp);
499 /* Select stdout/stderr if have data in buffer. */
500 if (buffer_len(&stdout_buffer) > 0)
501 FD_SET(fileno(stdout), *writesetp);
502 if (buffer_len(&stderr_buffer) > 0)
503 FD_SET(fileno(stderr), *writesetp);
505 /* channel_prepare_select could have closed the last channel */
506 if (session_closed && !channel_still_open() &&
507 !packet_have_data_to_write()) {
508 /* clear mask since we did not call select() */
509 memset(*readsetp, 0, *nallocp);
510 memset(*writesetp, 0, *nallocp);
513 FD_SET(connection_in, *readsetp);
517 /* Select server connection if have data to write to the server. */
518 if (packet_have_data_to_write())
519 FD_SET(connection_out, *writesetp);
521 if (control_fd != -1)
522 FD_SET(control_fd, *readsetp);
525 * Wait for something to happen. This will suspend the process until
526 * some selected descriptor can be read, written, or has some other
530 if (options.server_alive_interval == 0 || !compat20)
533 tv.tv_sec = options.server_alive_interval;
537 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
542 * We have to clear the select masks, because we return.
543 * We have to return, because the mainloop checks for the flags
544 * set by the signal handlers.
546 memset(*readsetp, 0, *nallocp);
547 memset(*writesetp, 0, *nallocp);
551 /* Note: we might still have data in the buffers. */
552 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
553 buffer_append(&stderr_buffer, buf, strlen(buf));
556 server_alive_check();
560 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
562 /* Flush stdout and stderr buffers. */
563 if (buffer_len(bout) > 0)
564 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
565 if (buffer_len(berr) > 0)
566 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
571 * Free (and clear) the buffer to reduce the amount of data that gets
578 /* Send the suspend signal to the program itself. */
579 kill(getpid(), SIGTSTP);
581 /* Reset window sizes in case they have changed */
582 received_window_change_signal = 1;
584 /* OK, we have been continued by the user. Reinitialize buffers. */
593 client_process_net_input(fd_set *readset)
599 * Read input from the server, and add any such data to the buffer of
600 * the packet subsystem.
602 if (FD_ISSET(connection_in, readset)) {
603 /* Read as much as possible. */
604 len = read(connection_in, buf, sizeof(buf));
606 /* Received EOF. The remote host has closed the connection. */
607 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
609 buffer_append(&stderr_buffer, buf, strlen(buf));
614 * There is a kernel bug on Solaris that causes select to
615 * sometimes wake up even though there is no data available.
617 if (len < 0 && (errno == EAGAIN || errno == EINTR))
621 /* An error has encountered. Perhaps there is a network problem. */
622 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
623 host, strerror(errno));
624 buffer_append(&stderr_buffer, buf, strlen(buf));
628 packet_process_incoming(buf, len);
633 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
638 id = packet_get_int();
641 if ((c = channel_lookup(id)) == NULL) {
642 error("%s: no channel for id %d", __func__, id);
646 if (type == SSH2_MSG_CHANNEL_SUCCESS)
647 debug2("Request suceeded on channel %d", id);
648 else if (type == SSH2_MSG_CHANNEL_FAILURE) {
649 error("Request failed on channel %d", id);
655 client_extra_session2_setup(int id, void *arg)
657 struct confirm_ctx *cctx = arg;
663 fatal("%s: cctx == NULL", __func__);
664 if ((c = channel_lookup(id)) == NULL)
665 fatal("%s: no channel for id %d", __func__, id);
667 display = getenv("DISPLAY");
668 if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
670 /* Get reasonable local authentication information. */
671 client_x11_get_proto(display, options.xauth_location,
672 options.forward_x11_trusted, &proto, &data);
673 /* Request forwarding with authentication spoofing. */
674 debug("Requesting X11 forwarding with authentication spoofing.");
675 x11_request_forwarding_with_spoofing(id, display, proto, data);
676 /* XXX wait for reply */
679 if (cctx->want_agent_fwd && options.forward_agent) {
680 debug("Requesting authentication agent forwarding.");
681 channel_request_start(id, "auth-agent-req@openssh.com", 0);
685 client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
686 cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
687 client_subsystem_reply);
689 c->confirm_ctx = NULL;
690 buffer_free(&cctx->cmd);
692 if (cctx->env != NULL) {
693 for (i = 0; cctx->env[i] != NULL; i++)
701 client_process_control(fd_set *readset)
705 int client_fd, new_fd[3], ver, allowed;
707 struct sockaddr_storage addr;
708 struct confirm_ctx *cctx;
710 u_int i, len, env_len, command, flags;
715 * Accept connection on control socket
717 if (control_fd == -1 || !FD_ISSET(control_fd, readset))
720 memset(&addr, 0, sizeof(addr));
721 addrlen = sizeof(addr);
722 if ((client_fd = accept(control_fd,
723 (struct sockaddr*)&addr, &addrlen)) == -1) {
724 error("%s accept: %s", __func__, strerror(errno));
728 if (getpeereid(client_fd, &euid, &egid) < 0) {
729 error("%s getpeereid failed: %s", __func__, strerror(errno));
733 if ((euid != 0) && (getuid() != euid)) {
734 error("control mode uid mismatch: peer euid %u != uid %u",
735 (u_int) euid, (u_int) getuid());
740 unset_nonblock(client_fd);
744 if (ssh_msg_recv(client_fd, &m) == -1) {
745 error("%s: client msg_recv failed", __func__);
750 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
751 error("%s: wrong client version %d", __func__, ver);
758 command = buffer_get_int(&m);
759 flags = buffer_get_int(&m);
764 case SSHMUX_COMMAND_OPEN:
765 if (options.control_master == SSHCTL_MASTER_ASK ||
766 options.control_master == SSHCTL_MASTER_AUTO_ASK)
767 allowed = ask_permission("Allow shared connection "
771 case SSHMUX_COMMAND_TERMINATE:
772 if (options.control_master == SSHCTL_MASTER_ASK ||
773 options.control_master == SSHCTL_MASTER_AUTO_ASK)
774 allowed = ask_permission("Terminate shared connection "
779 case SSHMUX_COMMAND_ALIVE_CHECK:
780 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
782 buffer_put_int(&m, allowed);
783 buffer_put_int(&m, getpid());
784 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
785 error("%s: client msg_send failed", __func__);
794 error("Unsupported command %d", command);
800 /* Reply for SSHMUX_COMMAND_OPEN */
802 buffer_put_int(&m, allowed);
803 buffer_put_int(&m, getpid());
804 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
805 error("%s: client msg_send failed", __func__);
812 error("Refused control connection");
819 if (ssh_msg_recv(client_fd, &m) == -1) {
820 error("%s: client msg_recv failed", __func__);
825 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
826 error("%s: wrong client version %d", __func__, ver);
832 cctx = xcalloc(1, sizeof(*cctx));
833 cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
834 cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
835 cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
836 cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
837 cctx->term = buffer_get_string(&m, &len);
839 cmd = buffer_get_string(&m, &len);
840 buffer_init(&cctx->cmd);
841 buffer_append(&cctx->cmd, cmd, strlen(cmd));
843 env_len = buffer_get_int(&m);
844 env_len = MIN(env_len, 4096);
845 debug3("%s: receiving %d env vars", __func__, env_len);
847 cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
848 for (i = 0; i < env_len; i++)
849 cctx->env[i] = buffer_get_string(&m, &len);
853 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
854 cctx->want_tty, cctx->want_subsys, cmd);
857 /* Gather fds from client */
858 new_fd[0] = mm_receive_fd(client_fd);
859 new_fd[1] = mm_receive_fd(client_fd);
860 new_fd[2] = mm_receive_fd(client_fd);
862 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
863 new_fd[0], new_fd[1], new_fd[2]);
865 /* Try to pick up ttymodes from client before it goes raw */
866 if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
867 error("%s: tcgetattr: %s", __func__, strerror(errno));
869 /* This roundtrip is just for synchronisation of ttymodes */
871 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
872 error("%s: client msg_send failed", __func__);
880 for (i = 0; i < env_len; i++)
888 /* enable nonblocking unless tty */
889 if (!isatty(new_fd[0]))
890 set_nonblock(new_fd[0]);
891 if (!isatty(new_fd[1]))
892 set_nonblock(new_fd[1]);
893 if (!isatty(new_fd[2]))
894 set_nonblock(new_fd[2]);
896 set_nonblock(client_fd);
898 c = channel_new("session", SSH_CHANNEL_OPENING,
899 new_fd[0], new_fd[1], new_fd[2],
900 CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
901 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
904 c->ctl_fd = client_fd;
906 debug3("%s: channel_new: %d", __func__, c->self);
908 channel_send_open(c->self);
909 channel_register_confirm(c->self, client_extra_session2_setup, cctx);
913 process_cmdline(void)
915 void (*handler)(int);
916 char *s, *cmd, *cancel_host;
923 handler = signal(SIGINT, SIG_IGN);
924 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
927 while (*s && isspace(*s))
930 s++; /* Skip cmdline '-', if any */
934 if (*s == 'h' || *s == 'H' || *s == '?') {
936 logit(" -L[bind_address:]port:host:hostport "
937 "Request local forward");
938 logit(" -R[bind_address:]port:host:hostport "
939 "Request remote forward");
940 logit(" -KR[bind_address:]port "
941 "Cancel remote forward");
942 if (!options.permit_local_command)
945 "Execute local command");
949 if (*s == '!' && options.permit_local_command) {
959 if (*s != 'L' && *s != 'R') {
960 logit("Invalid command.");
965 if (local && delete) {
966 logit("Not supported.");
969 if ((!local || delete) && !compat20) {
970 logit("Not supported for SSH protocol version 1.");
975 while (*s && isspace(*s))
980 cancel_host = hpdelim(&s); /* may be NULL */
982 cancel_port = a2port(s);
983 cancel_host = cleanhostname(cancel_host);
985 cancel_port = a2port(cancel_host);
988 if (cancel_port == 0) {
989 logit("Bad forwarding close port");
992 channel_request_rforward_cancel(cancel_host, cancel_port);
994 if (!parse_forward(&fwd, s)) {
995 logit("Bad forwarding specification.");
999 if (channel_setup_local_fwd_listener(fwd.listen_host,
1000 fwd.listen_port, fwd.connect_host,
1001 fwd.connect_port, options.gateway_ports) < 0) {
1002 logit("Port forwarding failed.");
1006 if (channel_request_remote_forwarding(fwd.listen_host,
1007 fwd.listen_port, fwd.connect_host,
1008 fwd.connect_port) < 0) {
1009 logit("Port forwarding failed.");
1014 logit("Forwarding port.");
1018 signal(SIGINT, handler);
1024 /* process the characters one by one */
1026 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1038 for (i = 0; i < (u_int)len; i++) {
1039 /* Get one character at a time. */
1042 if (escape_pending) {
1043 /* We have previously seen an escape character. */
1044 /* Clear the flag now. */
1047 /* Process the escaped character. */
1050 /* Terminate the connection. */
1051 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1052 buffer_append(berr, string, strlen(string));
1058 /* Suspend the program. */
1059 /* Print a message to that effect to the user. */
1060 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1061 buffer_append(berr, string, strlen(string));
1063 /* Restore terminal modes and suspend. */
1064 client_suspend_self(bin, bout, berr);
1066 /* We have been continued. */
1071 snprintf(string, sizeof string,
1072 "%cB\r\n", escape_char);
1073 buffer_append(berr, string,
1075 channel_request_start(session_ident,
1077 packet_put_int(1000);
1084 if (datafellows & SSH_BUG_NOREKEY)
1085 logit("Server does not support re-keying");
1093 * Detach the program (continue to serve connections,
1094 * but put in background and no more new connections).
1096 /* Restore tty modes. */
1099 /* Stop listening for new connections. */
1100 channel_stop_listening();
1102 snprintf(string, sizeof string,
1103 "%c& [backgrounded]\n", escape_char);
1104 buffer_append(berr, string, strlen(string));
1106 /* Fork into background. */
1109 error("fork: %.100s", strerror(errno));
1112 if (pid != 0) { /* This is the parent. */
1113 /* The parent just exits. */
1116 /* The child continues serving connections. */
1118 buffer_append(bin, "\004", 1);
1119 /* fake EOF on stdin */
1121 } else if (!stdin_eof) {
1123 * Sending SSH_CMSG_EOF alone does not always appear
1124 * to be enough. So we try to send an EOF character
1127 packet_start(SSH_CMSG_STDIN_DATA);
1128 packet_put_string("\004", 1);
1132 if (buffer_len(bin) == 0) {
1133 packet_start(SSH_CMSG_EOF);
1140 snprintf(string, sizeof string,
1142 Supported escape sequences:\r\n\
1143 %c. - terminate connection\r\n\
1144 %cB - send a BREAK to the remote system\r\n\
1145 %cC - open a command line\r\n\
1146 %cR - Request rekey (SSH protocol 2 only)\r\n\
1147 %c^Z - suspend ssh\r\n\
1148 %c# - list forwarded connections\r\n\
1149 %c& - background ssh (when waiting for connections to terminate)\r\n\
1150 %c? - this message\r\n\
1151 %c%c - send the escape character by typing it twice\r\n\
1152 (Note that escapes are only recognized immediately after newline.)\r\n",
1153 escape_char, escape_char, escape_char, escape_char,
1154 escape_char, escape_char, escape_char, escape_char,
1155 escape_char, escape_char, escape_char);
1156 buffer_append(berr, string, strlen(string));
1160 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1161 buffer_append(berr, string, strlen(string));
1162 s = channel_open_message();
1163 buffer_append(berr, s, strlen(s));
1172 if (ch != escape_char) {
1173 buffer_put_char(bin, escape_char);
1176 /* Escaped characters fall through here */
1181 * The previous character was not an escape char. Check if this
1184 if (last_was_cr && ch == escape_char) {
1185 /* It is. Set the flag and continue to next character. */
1192 * Normal character. Record whether it was a newline,
1193 * and append it to the buffer.
1195 last_was_cr = (ch == '\r' || ch == '\n');
1196 buffer_put_char(bin, ch);
1203 client_process_input(fd_set *readset)
1208 /* Read input from stdin. */
1209 if (FD_ISSET(fileno(stdin), readset)) {
1210 /* Read as much as possible. */
1211 len = read(fileno(stdin), buf, sizeof(buf));
1212 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1213 return; /* we'll try again later */
1216 * Received EOF or error. They are treated
1217 * similarly, except that an error message is printed
1218 * if it was an error condition.
1221 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1222 buffer_append(&stderr_buffer, buf, strlen(buf));
1224 /* Mark that we have seen EOF. */
1227 * Send an EOF message to the server unless there is
1228 * data in the buffer. If there is data in the
1229 * buffer, no message will be sent now. Code
1230 * elsewhere will send the EOF when the buffer
1231 * becomes empty if stdin_eof is set.
1233 if (buffer_len(&stdin_buffer) == 0) {
1234 packet_start(SSH_CMSG_EOF);
1237 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1239 * Normal successful read, and no escape character.
1240 * Just append the data to buffer.
1242 buffer_append(&stdin_buffer, buf, len);
1245 * Normal, successful read. But we have an escape character
1246 * and have to process the characters one by one.
1248 if (process_escapes(&stdin_buffer, &stdout_buffer,
1249 &stderr_buffer, buf, len) == -1)
1256 client_process_output(fd_set *writeset)
1261 /* Write buffered output to stdout. */
1262 if (FD_ISSET(fileno(stdout), writeset)) {
1263 /* Write as much data as possible. */
1264 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1265 buffer_len(&stdout_buffer));
1267 if (errno == EINTR || errno == EAGAIN)
1271 * An error or EOF was encountered. Put an
1272 * error message to stderr buffer.
1274 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1275 buffer_append(&stderr_buffer, buf, strlen(buf));
1280 /* Consume printed data from the buffer. */
1281 buffer_consume(&stdout_buffer, len);
1282 stdout_bytes += len;
1284 /* Write buffered output to stderr. */
1285 if (FD_ISSET(fileno(stderr), writeset)) {
1286 /* Write as much data as possible. */
1287 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1288 buffer_len(&stderr_buffer));
1290 if (errno == EINTR || errno == EAGAIN)
1293 /* EOF or error, but can't even print error message. */
1298 /* Consume printed characters from the buffer. */
1299 buffer_consume(&stderr_buffer, len);
1300 stderr_bytes += len;
1305 * Get packets from the connection input buffer, and process them as long as
1306 * there are packets available.
1308 * Any unknown packets received during the actual
1309 * session cause the session to terminate. This is
1310 * intended to make debugging easier since no
1311 * confirmations are sent. Any compatible protocol
1312 * extensions must be negotiated during the
1313 * preparatory phase.
1317 client_process_buffered_input_packets(void)
1319 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1322 /* scan buf[] for '~' before sending data to the peer */
1325 simple_escape_filter(Channel *c, char *buf, int len)
1327 /* XXX we assume c->extended is writeable */
1328 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1332 client_channel_closed(int id, void *arg)
1334 channel_cancel_cleanup(id);
1340 * Implements the interactive session with the server. This is called after
1341 * the user has been authenticated, and a command has been started on the
1342 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1343 * used as an escape character for terminating or suspending the session.
1347 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1349 fd_set *readset = NULL, *writeset = NULL;
1350 double start_time, total_time;
1351 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1355 debug("Entering interactive session.");
1357 start_time = get_current_time();
1359 /* Initialize variables. */
1364 buffer_high = 64 * 1024;
1365 connection_in = packet_get_connection_in();
1366 connection_out = packet_get_connection_out();
1367 max_fd = MAX(connection_in, connection_out);
1368 if (control_fd != -1)
1369 max_fd = MAX(max_fd, control_fd);
1372 /* enable nonblocking unless tty */
1373 if (!isatty(fileno(stdin)))
1374 set_nonblock(fileno(stdin));
1375 if (!isatty(fileno(stdout)))
1376 set_nonblock(fileno(stdout));
1377 if (!isatty(fileno(stderr)))
1378 set_nonblock(fileno(stderr));
1379 max_fd = MAX(max_fd, fileno(stdin));
1380 max_fd = MAX(max_fd, fileno(stdout));
1381 max_fd = MAX(max_fd, fileno(stderr));
1387 escape_char = escape_char_arg;
1389 /* Initialize buffers. */
1390 buffer_init(&stdin_buffer);
1391 buffer_init(&stdout_buffer);
1392 buffer_init(&stderr_buffer);
1394 client_init_dispatch();
1397 * Set signal handlers, (e.g. to restore non-blocking mode)
1398 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1400 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1401 signal(SIGHUP, signal_handler);
1402 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1403 signal(SIGINT, signal_handler);
1404 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1405 signal(SIGQUIT, signal_handler);
1406 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1407 signal(SIGTERM, signal_handler);
1408 signal(SIGWINCH, window_change_handler);
1414 session_ident = ssh2_chan_id;
1415 if (escape_char != SSH_ESCAPECHAR_NONE)
1416 channel_register_filter(session_ident,
1417 simple_escape_filter, NULL);
1418 if (session_ident != -1)
1419 channel_register_cleanup(session_ident,
1420 client_channel_closed, 0);
1422 /* Check if we should immediately send eof on stdin. */
1423 client_check_initial_eof_on_stdin();
1426 /* Main loop of the client for the interactive session mode. */
1427 while (!quit_pending) {
1429 /* Process buffered packets sent by the server. */
1430 client_process_buffered_input_packets();
1432 if (compat20 && session_closed && !channel_still_open())
1435 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1438 debug("rekeying in progress");
1441 * Make packets of buffered stdin data, and buffer
1442 * them for sending to the server.
1445 client_make_packets_from_stdin_data();
1448 * Make packets from buffered channel data, and
1449 * enqueue them for sending to the server.
1451 if (packet_not_very_much_data_to_write())
1452 channel_output_poll();
1455 * Check if the window size has changed, and buffer a
1456 * message about it to the server if so.
1458 client_check_window_change();
1464 * Wait until we have something to do (something becomes
1465 * available on one of the descriptors).
1468 client_wait_until_can_do_something(&readset, &writeset,
1469 &max_fd2, &nalloc, rekeying);
1474 /* Do channel operations unless rekeying in progress. */
1476 channel_after_select(readset, writeset);
1477 if (need_rekeying || packet_need_rekeying()) {
1478 debug("need rekeying");
1480 kex_send_kexinit(xxx_kex);
1485 /* Buffer input from the connection. */
1486 client_process_net_input(readset);
1488 /* Accept control connections. */
1489 client_process_control(readset);
1495 /* Buffer data from stdin */
1496 client_process_input(readset);
1498 * Process output to stdout and stderr. Output to
1499 * the connection is processed elsewhere (above).
1501 client_process_output(writeset);
1504 /* Send as much buffered packet data as possible to the sender. */
1505 if (FD_ISSET(connection_out, writeset))
1506 packet_write_poll();
1513 /* Terminate the session. */
1515 /* Stop watching for window change. */
1516 signal(SIGWINCH, SIG_DFL);
1523 /* restore blocking io */
1524 if (!isatty(fileno(stdin)))
1525 unset_nonblock(fileno(stdin));
1526 if (!isatty(fileno(stdout)))
1527 unset_nonblock(fileno(stdout));
1528 if (!isatty(fileno(stderr)))
1529 unset_nonblock(fileno(stderr));
1532 * If there was no shell or command requested, there will be no remote
1533 * exit status to be returned. In that case, clear error code if the
1534 * connection was deliberately terminated at this end.
1536 if (no_shell_flag && received_signal == SIGTERM) {
1537 received_signal = 0;
1541 if (received_signal)
1542 fatal("Killed by signal %d.", (int) received_signal);
1545 * In interactive mode (with pseudo tty) display a message indicating
1546 * that the connection has been closed.
1548 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1549 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1550 buffer_append(&stderr_buffer, buf, strlen(buf));
1553 /* Output any buffered data for stdout. */
1554 while (buffer_len(&stdout_buffer) > 0) {
1555 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1556 buffer_len(&stdout_buffer));
1558 error("Write failed flushing stdout buffer.");
1561 buffer_consume(&stdout_buffer, len);
1562 stdout_bytes += len;
1565 /* Output any buffered data for stderr. */
1566 while (buffer_len(&stderr_buffer) > 0) {
1567 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1568 buffer_len(&stderr_buffer));
1570 error("Write failed flushing stderr buffer.");
1573 buffer_consume(&stderr_buffer, len);
1574 stderr_bytes += len;
1577 /* Clear and free any buffers. */
1578 memset(buf, 0, sizeof(buf));
1579 buffer_free(&stdin_buffer);
1580 buffer_free(&stdout_buffer);
1581 buffer_free(&stderr_buffer);
1583 /* Report bytes transferred, and transfer rates. */
1584 total_time = get_current_time() - start_time;
1585 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1586 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1588 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1589 stdin_bytes / total_time, stdout_bytes / total_time,
1590 stderr_bytes / total_time);
1592 /* Return the exit status of the program. */
1593 debug("Exit status %d", exit_status);
1600 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1603 char *data = packet_get_string(&data_len);
1605 buffer_append(&stdout_buffer, data, data_len);
1606 memset(data, 0, data_len);
1610 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1613 char *data = packet_get_string(&data_len);
1615 buffer_append(&stderr_buffer, data, data_len);
1616 memset(data, 0, data_len);
1620 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1622 exit_status = packet_get_int();
1624 /* Acknowledge the exit. */
1625 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1628 * Must wait for packet to be sent since we are
1631 packet_write_wait();
1632 /* Flag that we want to exit. */
1636 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1639 int remote_id, sock;
1641 /* Read the remote channel number from the message. */
1642 remote_id = packet_get_int();
1646 * Get a connection to the local authentication agent (this may again
1649 sock = ssh_get_authentication_socket();
1652 * If we could not connect the agent, send an error message back to
1653 * the server. This should never happen unless the agent dies,
1654 * because authentication forwarding is only enabled if we have an
1658 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1659 -1, 0, 0, 0, "authentication agent connection", 1);
1660 c->remote_id = remote_id;
1664 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1665 packet_put_int(remote_id);
1667 /* Send a confirmation to the remote host. */
1668 debug("Forwarding authentication connection.");
1669 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1670 packet_put_int(remote_id);
1671 packet_put_int(c->self);
1677 client_request_forwarded_tcpip(const char *request_type, int rchan)
1680 char *listen_address, *originator_address;
1681 int listen_port, originator_port;
1684 /* Get rest of the packet */
1685 listen_address = packet_get_string(NULL);
1686 listen_port = packet_get_int();
1687 originator_address = packet_get_string(NULL);
1688 originator_port = packet_get_int();
1691 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1692 listen_address, listen_port, originator_address, originator_port);
1694 sock = channel_connect_by_listen_address(listen_port);
1696 xfree(originator_address);
1697 xfree(listen_address);
1700 c = channel_new("forwarded-tcpip",
1701 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1702 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1703 originator_address, 1);
1704 xfree(originator_address);
1705 xfree(listen_address);
1710 client_request_x11(const char *request_type, int rchan)
1714 int originator_port;
1717 if (!options.forward_x11) {
1718 error("Warning: ssh server tried X11 forwarding.");
1719 error("Warning: this is probably a break-in attempt by a malicious server.");
1722 originator = packet_get_string(NULL);
1723 if (datafellows & SSH_BUG_X11FWD) {
1724 debug2("buggy server: x11 request w/o originator_port");
1725 originator_port = 0;
1727 originator_port = packet_get_int();
1730 /* XXX check permission */
1731 debug("client_request_x11: request from %s %d", originator,
1734 sock = x11_connect_display();
1737 c = channel_new("x11",
1738 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1739 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1745 client_request_agent(const char *request_type, int rchan)
1750 if (!options.forward_agent) {
1751 error("Warning: ssh server tried agent forwarding.");
1752 error("Warning: this is probably a break-in attempt by a malicious server.");
1755 sock = ssh_get_authentication_socket();
1758 c = channel_new("authentication agent connection",
1759 SSH_CHANNEL_OPEN, sock, sock, -1,
1760 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1761 "authentication agent connection", 1);
1766 /* XXXX move to generic input handler */
1768 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1773 u_int rmaxpack, rwindow, len;
1775 ctype = packet_get_string(&len);
1776 rchan = packet_get_int();
1777 rwindow = packet_get_int();
1778 rmaxpack = packet_get_int();
1780 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1781 ctype, rchan, rwindow, rmaxpack);
1783 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1784 c = client_request_forwarded_tcpip(ctype, rchan);
1785 } else if (strcmp(ctype, "x11") == 0) {
1786 c = client_request_x11(ctype, rchan);
1787 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1788 c = client_request_agent(ctype, rchan);
1790 /* XXX duplicate : */
1792 debug("confirm %s", ctype);
1793 c->remote_id = rchan;
1794 c->remote_window = rwindow;
1795 c->remote_maxpacket = rmaxpack;
1796 if (c->type != SSH_CHANNEL_CONNECTING) {
1797 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1798 packet_put_int(c->remote_id);
1799 packet_put_int(c->self);
1800 packet_put_int(c->local_window);
1801 packet_put_int(c->local_maxpacket);
1805 debug("failure %s", ctype);
1806 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1807 packet_put_int(rchan);
1808 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1809 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1810 packet_put_cstring("open failed");
1811 packet_put_cstring("");
1818 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1821 int exitval, id, reply, success = 0;
1824 id = packet_get_int();
1825 rtype = packet_get_string(NULL);
1826 reply = packet_get_char();
1828 debug("client_input_channel_req: channel %d rtype %s reply %d",
1832 error("client_input_channel_req: request for channel -1");
1833 } else if ((c = channel_lookup(id)) == NULL) {
1834 error("client_input_channel_req: channel %d: unknown channel", id);
1835 } else if (strcmp(rtype, "exit-status") == 0) {
1836 exitval = packet_get_int();
1837 if (id == session_ident) {
1839 exit_status = exitval;
1840 } else if (c->ctl_fd == -1) {
1841 error("client_input_channel_req: unexpected channel %d",
1844 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1850 packet_start(success ?
1851 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1858 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1864 rtype = packet_get_string(NULL);
1865 want_reply = packet_get_char();
1866 debug("client_input_global_request: rtype %s want_reply %d",
1869 packet_start(success ?
1870 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1872 packet_write_wait();
1878 client_session2_setup(int id, int want_tty, int want_subsystem,
1879 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1880 dispatch_fn *subsys_repl)
1885 debug2("%s: id %d", __func__, id);
1887 if ((c = channel_lookup(id)) == NULL)
1888 fatal("client_session2_setup: channel %d: unknown channel", id);
1894 /* Store window size in the packet. */
1895 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1896 memset(&ws, 0, sizeof(ws));
1898 channel_request_start(id, "pty-req", 0);
1899 packet_put_cstring(term != NULL ? term : "");
1900 packet_put_int((u_int)ws.ws_col);
1901 packet_put_int((u_int)ws.ws_row);
1902 packet_put_int((u_int)ws.ws_xpixel);
1903 packet_put_int((u_int)ws.ws_ypixel);
1904 tio = get_saved_tio();
1905 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1907 /* XXX wait for reply */
1911 /* Transfer any environment variables from client to server */
1912 if (options.num_send_env != 0 && env != NULL) {
1916 debug("Sending environment.");
1917 for (i = 0; env[i] != NULL; i++) {
1919 name = xstrdup(env[i]);
1920 if ((val = strchr(name, '=')) == NULL) {
1927 for (j = 0; j < options.num_send_env; j++) {
1928 if (match_pattern(name, options.send_env[j])) {
1934 debug3("Ignored env %s", name);
1939 debug("Sending env %s = %s", name, val);
1940 channel_request_start(id, "env", 0);
1941 packet_put_cstring(name);
1942 packet_put_cstring(val);
1948 len = buffer_len(cmd);
1952 if (want_subsystem) {
1953 debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1954 channel_request_start(id, "subsystem", subsys_repl != NULL);
1955 if (subsys_repl != NULL) {
1956 /* register callback for reply */
1957 /* XXX we assume that client_loop has already been called */
1958 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1959 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1962 debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1963 channel_request_start(id, "exec", 0);
1965 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1968 channel_request_start(id, "shell", 0);
1974 client_init_dispatch_20(void)
1976 dispatch_init(&dispatch_protocol_error);
1978 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1979 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1980 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1981 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1982 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1983 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1984 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1985 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1986 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1987 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1990 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1992 /* global request reply messages */
1993 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1994 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1997 client_init_dispatch_13(void)
1999 dispatch_init(NULL);
2000 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2001 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2002 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2003 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2004 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2005 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2006 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2007 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2008 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2010 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2011 &client_input_agent_open : &deny_input_open);
2012 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2013 &x11_input_open : &deny_input_open);
2016 client_init_dispatch_15(void)
2018 client_init_dispatch_13();
2019 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2020 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2023 client_init_dispatch(void)
2026 client_init_dispatch_20();
2028 client_init_dispatch_13();
2030 client_init_dispatch_15();
2033 /* client specific fatal cleanup */
2038 leave_non_blocking();
2039 if (options.control_path != NULL && control_fd != -1)
2040 unlink(options.control_path);