2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * The main loop for the interactive session (client side).
7 * As far as I am concerned, the code I have written for this software
8 * can be used freely for any purpose. Any derived versions of this
9 * software must be clearly marked as such, and if the derived work is
10 * incompatible with the protocol description in the RFC file, it must be
11 * called by a name other than "ssh" or "Secure Shell".
14 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 * SSH2 support added by Markus Friedl.
38 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
49 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
50 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
51 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
53 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
54 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
55 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
56 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
57 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
58 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
62 RCSID("$OpenBSD: clientloop.c,v 1.147 2005/12/07 03:52:22 djm Exp $");
79 #include "clientloop.h"
80 #include "sshconnect.h"
85 #include "monitor_fdpass.h"
90 extern Options options;
92 /* Flag indicating that stdin should be redirected from /dev/null. */
93 extern int stdin_null_flag;
95 /* Flag indicating that no shell has been requested */
96 extern int no_shell_flag;
99 extern int control_fd;
102 * Name of the host we are connecting to. This is the name given on the
103 * command line, or the HostName specified for the user-supplied name in a
104 * configuration file.
109 * Flag to indicate that we have received a window change signal which has
110 * not yet been processed. This will cause a message indicating the new
111 * window size to be sent to the server a little later. This is volatile
112 * because this is updated in a signal handler.
114 static volatile sig_atomic_t received_window_change_signal = 0;
115 static volatile sig_atomic_t received_signal = 0;
117 /* Flag indicating whether the user's terminal is in non-blocking mode. */
118 static int in_non_blocking_mode = 0;
120 /* Common data for the client loop code. */
121 static int quit_pending; /* Set to non-zero to quit the client loop. */
122 static int escape_char; /* Escape character. */
123 static int escape_pending; /* Last character was the escape character */
124 static int last_was_cr; /* Last character was a newline. */
125 static int exit_status; /* Used to store the exit status of the command. */
126 static int stdin_eof; /* EOF has been encountered on standard error. */
127 static Buffer stdin_buffer; /* Buffer for stdin data. */
128 static Buffer stdout_buffer; /* Buffer for stdout data. */
129 static Buffer stderr_buffer; /* Buffer for stderr data. */
130 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
131 static u_int buffer_high;/* Soft max buffer size. */
132 static int connection_in; /* Connection to server (input). */
133 static int connection_out; /* Connection to server (output). */
134 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
135 static int session_closed = 0; /* In SSH2: login session closed. */
136 static int server_alive_timeouts = 0;
138 static void client_init_dispatch(void);
139 int session_ident = -1;
155 void ssh_process_session2_setup(int, int, int, Buffer *);
157 /* Restores stdin to blocking mode. */
160 leave_non_blocking(void)
162 if (in_non_blocking_mode) {
163 unset_nonblock(fileno(stdin));
164 in_non_blocking_mode = 0;
168 /* Puts stdin terminal in non-blocking mode. */
171 enter_non_blocking(void)
173 in_non_blocking_mode = 1;
174 set_nonblock(fileno(stdin));
178 * Signal handler for the window change signal (SIGWINCH). This just sets a
179 * flag indicating that the window has changed.
183 window_change_handler(int sig)
185 received_window_change_signal = 1;
186 signal(SIGWINCH, window_change_handler);
190 * Signal handler for signals that cause the program to terminate. These
191 * signals must be trapped to restore terminal modes.
195 signal_handler(int sig)
197 received_signal = sig;
202 * Returns current time in seconds from Jan 1, 1970 with the maximum
203 * available resolution.
207 get_current_time(void)
210 gettimeofday(&tv, NULL);
211 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
214 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
216 client_x11_get_proto(const char *display, const char *xauth_path,
217 u_int trusted, char **_proto, char **_data)
222 static char proto[512], data[512];
224 int got_data = 0, generated = 0, do_unlink = 0, i;
225 char *xauthdir, *xauthfile;
228 xauthdir = xauthfile = NULL;
231 proto[0] = data[0] = '\0';
233 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
234 debug("No xauth program.");
236 if (display == NULL) {
237 debug("x11_get_proto: DISPLAY not set");
241 * Handle FamilyLocal case where $DISPLAY does
242 * not match an authorization entry. For this we
243 * just try "xauth list unix:displaynum.screennum".
244 * XXX: "localhost" match to determine FamilyLocal
247 if (strncmp(display, "localhost:", 10) == 0) {
248 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
253 xauthdir = xmalloc(MAXPATHLEN);
254 xauthfile = xmalloc(MAXPATHLEN);
255 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
256 if (mkdtemp(xauthdir) != NULL) {
258 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
260 snprintf(cmd, sizeof(cmd),
261 "%s -f %s generate %s " SSH_X11_PROTO
262 " untrusted timeout 1200 2>" _PATH_DEVNULL,
263 xauth_path, xauthfile, display);
264 debug2("x11_get_proto: %s", cmd);
265 if (system(cmd) == 0)
269 snprintf(cmd, sizeof(cmd),
270 "%s %s%s list %s 2>" _PATH_DEVNULL,
272 generated ? "-f " : "" ,
273 generated ? xauthfile : "",
275 debug2("x11_get_proto: %s", cmd);
277 if (f && fgets(line, sizeof(line), f) &&
278 sscanf(line, "%*s %511s %511s", proto, data) == 2)
294 * If we didn't get authentication data, just make up some
295 * data. The forwarding code will check the validity of the
296 * response anyway, and substitute this data. The X11
297 * server, however, will ignore this fake data and use
298 * whatever authentication mechanisms it was using otherwise
299 * for the local connection.
304 logit("Warning: No xauth data; "
305 "using fake authentication data for X11 forwarding.");
306 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
307 for (i = 0; i < 16; i++) {
310 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
318 * This is called when the interactive is entered. This checks if there is
319 * an EOF coming on stdin. We must check this explicitly, as select() does
320 * not appear to wake up when redirecting from /dev/null.
324 client_check_initial_eof_on_stdin(void)
330 * If standard input is to be "redirected from /dev/null", we simply
331 * mark that we have seen an EOF and send an EOF message to the
332 * server. Otherwise, we try to read a single character; it appears
333 * that for some files, such /dev/null, select() never wakes up for
334 * read for this descriptor, which means that we never get EOF. This
335 * way we will get the EOF if stdin comes from /dev/null or similar.
337 if (stdin_null_flag) {
338 /* Fake EOF on stdin. */
339 debug("Sending eof.");
341 packet_start(SSH_CMSG_EOF);
344 enter_non_blocking();
346 /* Check for immediate EOF on stdin. */
347 len = read(fileno(stdin), buf, 1);
349 /* EOF. Record that we have seen it and send EOF to server. */
350 debug("Sending eof.");
352 packet_start(SSH_CMSG_EOF);
354 } else if (len > 0) {
356 * Got data. We must store the data in the buffer,
357 * and also process it as an escape character if
360 if ((u_char) buf[0] == escape_char)
363 buffer_append(&stdin_buffer, buf, 1);
365 leave_non_blocking();
371 * Make packets from buffered stdin data, and buffer them for sending to the
376 client_make_packets_from_stdin_data(void)
380 /* Send buffered stdin data to the server. */
381 while (buffer_len(&stdin_buffer) > 0 &&
382 packet_not_very_much_data_to_write()) {
383 len = buffer_len(&stdin_buffer);
384 /* Keep the packets at reasonable size. */
385 if (len > packet_get_maxsize())
386 len = packet_get_maxsize();
387 packet_start(SSH_CMSG_STDIN_DATA);
388 packet_put_string(buffer_ptr(&stdin_buffer), len);
390 buffer_consume(&stdin_buffer, len);
392 /* If we have a pending EOF, send it now. */
393 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
394 packet_start(SSH_CMSG_EOF);
401 * Checks if the client window has changed, and sends a packet about it to
402 * the server if so. The actual change is detected elsewhere (by a software
403 * interrupt on Unix); this just checks the flag and sends a message if
408 client_check_window_change(void)
412 if (! received_window_change_signal)
415 received_window_change_signal = 0;
417 debug2("client_check_window_change: changed");
420 channel_send_window_changes();
422 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
424 packet_start(SSH_CMSG_WINDOW_SIZE);
425 packet_put_int(ws.ws_row);
426 packet_put_int(ws.ws_col);
427 packet_put_int(ws.ws_xpixel);
428 packet_put_int(ws.ws_ypixel);
434 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
436 server_alive_timeouts = 0;
437 client_global_request_reply_fwd(type, seq, ctxt);
441 server_alive_check(void)
443 if (++server_alive_timeouts > options.server_alive_count_max)
444 packet_disconnect("Timeout, server not responding.");
445 packet_start(SSH2_MSG_GLOBAL_REQUEST);
446 packet_put_cstring("keepalive@openssh.com");
447 packet_put_char(1); /* boolean: want reply */
452 * Waits until the client can do something (some data becomes available on
453 * one of the file descriptors).
456 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
457 int *maxfdp, u_int *nallocp, int rekeying)
459 struct timeval tv, *tvp;
462 /* Add any selections by the channel mechanism. */
463 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
466 /* Read from the connection, unless our buffers are full. */
467 if (buffer_len(&stdout_buffer) < buffer_high &&
468 buffer_len(&stderr_buffer) < buffer_high &&
469 channel_not_very_much_buffered_data())
470 FD_SET(connection_in, *readsetp);
472 * Read from stdin, unless we have seen EOF or have very much
473 * buffered data to send to the server.
475 if (!stdin_eof && packet_not_very_much_data_to_write())
476 FD_SET(fileno(stdin), *readsetp);
478 /* Select stdout/stderr if have data in buffer. */
479 if (buffer_len(&stdout_buffer) > 0)
480 FD_SET(fileno(stdout), *writesetp);
481 if (buffer_len(&stderr_buffer) > 0)
482 FD_SET(fileno(stderr), *writesetp);
484 /* channel_prepare_select could have closed the last channel */
485 if (session_closed && !channel_still_open() &&
486 !packet_have_data_to_write()) {
487 /* clear mask since we did not call select() */
488 memset(*readsetp, 0, *nallocp);
489 memset(*writesetp, 0, *nallocp);
492 FD_SET(connection_in, *readsetp);
496 /* Select server connection if have data to write to the server. */
497 if (packet_have_data_to_write())
498 FD_SET(connection_out, *writesetp);
500 if (control_fd != -1)
501 FD_SET(control_fd, *readsetp);
504 * Wait for something to happen. This will suspend the process until
505 * some selected descriptor can be read, written, or has some other
509 if (options.server_alive_interval == 0 || !compat20)
512 tv.tv_sec = options.server_alive_interval;
516 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
521 * We have to clear the select masks, because we return.
522 * We have to return, because the mainloop checks for the flags
523 * set by the signal handlers.
525 memset(*readsetp, 0, *nallocp);
526 memset(*writesetp, 0, *nallocp);
530 /* Note: we might still have data in the buffers. */
531 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
532 buffer_append(&stderr_buffer, buf, strlen(buf));
535 server_alive_check();
539 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
541 /* Flush stdout and stderr buffers. */
542 if (buffer_len(bout) > 0)
543 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
544 if (buffer_len(berr) > 0)
545 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
550 * Free (and clear) the buffer to reduce the amount of data that gets
557 /* Send the suspend signal to the program itself. */
558 kill(getpid(), SIGTSTP);
560 /* Reset window sizes in case they have changed */
561 received_window_change_signal = 1;
563 /* OK, we have been continued by the user. Reinitialize buffers. */
572 client_process_net_input(fd_set * readset)
578 * Read input from the server, and add any such data to the buffer of
579 * the packet subsystem.
581 if (FD_ISSET(connection_in, readset)) {
582 /* Read as much as possible. */
583 len = read(connection_in, buf, sizeof(buf));
585 /* Received EOF. The remote host has closed the connection. */
586 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
588 buffer_append(&stderr_buffer, buf, strlen(buf));
593 * There is a kernel bug on Solaris that causes select to
594 * sometimes wake up even though there is no data available.
596 if (len < 0 && (errno == EAGAIN || errno == EINTR))
600 /* An error has encountered. Perhaps there is a network problem. */
601 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
602 host, strerror(errno));
603 buffer_append(&stderr_buffer, buf, strlen(buf));
607 packet_process_incoming(buf, len);
612 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
617 id = packet_get_int();
620 if ((c = channel_lookup(id)) == NULL) {
621 error("%s: no channel for id %d", __func__, id);
625 if (type == SSH2_MSG_CHANNEL_SUCCESS)
626 debug2("Request suceeded on channel %d", id);
627 else if (type == SSH2_MSG_CHANNEL_FAILURE) {
628 error("Request failed on channel %d", id);
634 client_extra_session2_setup(int id, void *arg)
636 struct confirm_ctx *cctx = arg;
642 fatal("%s: cctx == NULL", __func__);
643 if ((c = channel_lookup(id)) == NULL)
644 fatal("%s: no channel for id %d", __func__, id);
646 display = getenv("DISPLAY");
647 if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
649 /* Get reasonable local authentication information. */
650 client_x11_get_proto(display, options.xauth_location,
651 options.forward_x11_trusted, &proto, &data);
652 /* Request forwarding with authentication spoofing. */
653 debug("Requesting X11 forwarding with authentication spoofing.");
654 x11_request_forwarding_with_spoofing(id, display, proto, data);
655 /* XXX wait for reply */
658 if (cctx->want_agent_fwd && options.forward_agent) {
659 debug("Requesting authentication agent forwarding.");
660 channel_request_start(id, "auth-agent-req@openssh.com", 0);
664 client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
665 cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
666 client_subsystem_reply);
668 c->confirm_ctx = NULL;
669 buffer_free(&cctx->cmd);
671 if (cctx->env != NULL) {
672 for (i = 0; cctx->env[i] != NULL; i++)
680 client_process_control(fd_set * readset)
684 int client_fd, new_fd[3], ver, allowed;
686 struct sockaddr_storage addr;
687 struct confirm_ctx *cctx;
689 u_int i, len, env_len, command, flags;
694 * Accept connection on control socket
696 if (control_fd == -1 || !FD_ISSET(control_fd, readset))
699 memset(&addr, 0, sizeof(addr));
700 addrlen = sizeof(addr);
701 if ((client_fd = accept(control_fd,
702 (struct sockaddr*)&addr, &addrlen)) == -1) {
703 error("%s accept: %s", __func__, strerror(errno));
707 if (getpeereid(client_fd, &euid, &egid) < 0) {
708 error("%s getpeereid failed: %s", __func__, strerror(errno));
712 if ((euid != 0) && (getuid() != euid)) {
713 error("control mode uid mismatch: peer euid %u != uid %u",
714 (u_int) euid, (u_int) getuid());
719 unset_nonblock(client_fd);
723 if (ssh_msg_recv(client_fd, &m) == -1) {
724 error("%s: client msg_recv failed", __func__);
729 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
730 error("%s: wrong client version %d", __func__, ver);
737 command = buffer_get_int(&m);
738 flags = buffer_get_int(&m);
743 case SSHMUX_COMMAND_OPEN:
744 if (options.control_master == SSHCTL_MASTER_ASK ||
745 options.control_master == SSHCTL_MASTER_AUTO_ASK)
746 allowed = ask_permission("Allow shared connection "
750 case SSHMUX_COMMAND_TERMINATE:
751 if (options.control_master == SSHCTL_MASTER_ASK ||
752 options.control_master == SSHCTL_MASTER_AUTO_ASK)
753 allowed = ask_permission("Terminate shared connection "
758 case SSHMUX_COMMAND_ALIVE_CHECK:
759 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
761 buffer_put_int(&m, allowed);
762 buffer_put_int(&m, getpid());
763 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
764 error("%s: client msg_send failed", __func__);
773 error("Unsupported command %d", command);
779 /* Reply for SSHMUX_COMMAND_OPEN */
781 buffer_put_int(&m, allowed);
782 buffer_put_int(&m, getpid());
783 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
784 error("%s: client msg_send failed", __func__);
791 error("Refused control connection");
798 if (ssh_msg_recv(client_fd, &m) == -1) {
799 error("%s: client msg_recv failed", __func__);
804 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
805 error("%s: wrong client version %d", __func__, ver);
811 cctx = xmalloc(sizeof(*cctx));
812 memset(cctx, 0, sizeof(*cctx));
813 cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
814 cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
815 cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
816 cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
817 cctx->term = buffer_get_string(&m, &len);
819 cmd = buffer_get_string(&m, &len);
820 buffer_init(&cctx->cmd);
821 buffer_append(&cctx->cmd, cmd, strlen(cmd));
823 env_len = buffer_get_int(&m);
824 env_len = MIN(env_len, 4096);
825 debug3("%s: receiving %d env vars", __func__, env_len);
827 cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
828 for (i = 0; i < env_len; i++)
829 cctx->env[i] = buffer_get_string(&m, &len);
833 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
834 cctx->want_tty, cctx->want_subsys, cmd);
836 /* Gather fds from client */
837 new_fd[0] = mm_receive_fd(client_fd);
838 new_fd[1] = mm_receive_fd(client_fd);
839 new_fd[2] = mm_receive_fd(client_fd);
841 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
842 new_fd[0], new_fd[1], new_fd[2]);
844 /* Try to pick up ttymodes from client before it goes raw */
845 if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
846 error("%s: tcgetattr: %s", __func__, strerror(errno));
848 /* This roundtrip is just for synchronisation of ttymodes */
850 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
851 error("%s: client msg_send failed", __func__);
859 for (i = 0; i < env_len; i++)
867 /* enable nonblocking unless tty */
868 if (!isatty(new_fd[0]))
869 set_nonblock(new_fd[0]);
870 if (!isatty(new_fd[1]))
871 set_nonblock(new_fd[1]);
872 if (!isatty(new_fd[2]))
873 set_nonblock(new_fd[2]);
875 set_nonblock(client_fd);
877 c = channel_new("session", SSH_CHANNEL_OPENING,
878 new_fd[0], new_fd[1], new_fd[2],
879 CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
880 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
883 c->ctl_fd = client_fd;
885 debug3("%s: channel_new: %d", __func__, c->self);
887 channel_send_open(c->self);
888 channel_register_confirm(c->self, client_extra_session2_setup, cctx);
892 process_cmdline(void)
894 void (*handler)(int);
895 char *s, *cmd, *cancel_host;
902 handler = signal(SIGINT, SIG_IGN);
903 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
906 while (*s && isspace(*s))
909 s++; /* Skip cmdline '-', if any */
913 if (*s == 'h' || *s == 'H' || *s == '?') {
915 logit(" -Lport:host:hostport Request local forward");
916 logit(" -Rport:host:hostport Request remote forward");
917 logit(" -KRhostport Cancel remote forward");
918 if (!options.permit_local_command)
920 logit(" !args Execute local command");
924 if (*s == '!' && options.permit_local_command) {
934 if (*s != 'L' && *s != 'R') {
935 logit("Invalid command.");
940 if (local && delete) {
941 logit("Not supported.");
944 if ((!local || delete) && !compat20) {
945 logit("Not supported for SSH protocol version 1.");
950 while (*s && isspace(*s))
955 cancel_host = hpdelim(&s); /* may be NULL */
957 cancel_port = a2port(s);
958 cancel_host = cleanhostname(cancel_host);
960 cancel_port = a2port(cancel_host);
963 if (cancel_port == 0) {
964 logit("Bad forwarding close port");
967 channel_request_rforward_cancel(cancel_host, cancel_port);
969 if (!parse_forward(&fwd, s)) {
970 logit("Bad forwarding specification.");
974 if (channel_setup_local_fwd_listener(fwd.listen_host,
975 fwd.listen_port, fwd.connect_host,
976 fwd.connect_port, options.gateway_ports) < 0) {
977 logit("Port forwarding failed.");
981 channel_request_remote_forwarding(fwd.listen_host,
982 fwd.listen_port, fwd.connect_host,
986 logit("Forwarding port.");
990 signal(SIGINT, handler);
996 /* process the characters one by one */
998 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1010 for (i = 0; i < (u_int)len; i++) {
1011 /* Get one character at a time. */
1014 if (escape_pending) {
1015 /* We have previously seen an escape character. */
1016 /* Clear the flag now. */
1019 /* Process the escaped character. */
1022 /* Terminate the connection. */
1023 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1024 buffer_append(berr, string, strlen(string));
1030 /* Suspend the program. */
1031 /* Print a message to that effect to the user. */
1032 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1033 buffer_append(berr, string, strlen(string));
1035 /* Restore terminal modes and suspend. */
1036 client_suspend_self(bin, bout, berr);
1038 /* We have been continued. */
1043 snprintf(string, sizeof string,
1044 "%cB\r\n", escape_char);
1045 buffer_append(berr, string,
1047 channel_request_start(session_ident,
1049 packet_put_int(1000);
1056 if (datafellows & SSH_BUG_NOREKEY)
1057 logit("Server does not support re-keying");
1065 * Detach the program (continue to serve connections,
1066 * but put in background and no more new connections).
1068 /* Restore tty modes. */
1071 /* Stop listening for new connections. */
1072 channel_stop_listening();
1074 snprintf(string, sizeof string,
1075 "%c& [backgrounded]\n", escape_char);
1076 buffer_append(berr, string, strlen(string));
1078 /* Fork into background. */
1081 error("fork: %.100s", strerror(errno));
1084 if (pid != 0) { /* This is the parent. */
1085 /* The parent just exits. */
1088 /* The child continues serving connections. */
1090 buffer_append(bin, "\004", 1);
1091 /* fake EOF on stdin */
1093 } else if (!stdin_eof) {
1095 * Sending SSH_CMSG_EOF alone does not always appear
1096 * to be enough. So we try to send an EOF character
1099 packet_start(SSH_CMSG_STDIN_DATA);
1100 packet_put_string("\004", 1);
1104 if (buffer_len(bin) == 0) {
1105 packet_start(SSH_CMSG_EOF);
1112 snprintf(string, sizeof string,
1114 Supported escape sequences:\r\n\
1115 %c. - terminate connection\r\n\
1116 %cB - send a BREAK to the remote system\r\n\
1117 %cC - open a command line\r\n\
1118 %cR - Request rekey (SSH protocol 2 only)\r\n\
1119 %c^Z - suspend ssh\r\n\
1120 %c# - list forwarded connections\r\n\
1121 %c& - background ssh (when waiting for connections to terminate)\r\n\
1122 %c? - this message\r\n\
1123 %c%c - send the escape character by typing it twice\r\n\
1124 (Note that escapes are only recognized immediately after newline.)\r\n",
1125 escape_char, escape_char, escape_char, escape_char,
1126 escape_char, escape_char, escape_char, escape_char,
1127 escape_char, escape_char, escape_char);
1128 buffer_append(berr, string, strlen(string));
1132 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1133 buffer_append(berr, string, strlen(string));
1134 s = channel_open_message();
1135 buffer_append(berr, s, strlen(s));
1144 if (ch != escape_char) {
1145 buffer_put_char(bin, escape_char);
1148 /* Escaped characters fall through here */
1153 * The previous character was not an escape char. Check if this
1156 if (last_was_cr && ch == escape_char) {
1157 /* It is. Set the flag and continue to next character. */
1164 * Normal character. Record whether it was a newline,
1165 * and append it to the buffer.
1167 last_was_cr = (ch == '\r' || ch == '\n');
1168 buffer_put_char(bin, ch);
1175 client_process_input(fd_set * readset)
1180 /* Read input from stdin. */
1181 if (FD_ISSET(fileno(stdin), readset)) {
1182 /* Read as much as possible. */
1183 len = read(fileno(stdin), buf, sizeof(buf));
1184 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1185 return; /* we'll try again later */
1188 * Received EOF or error. They are treated
1189 * similarly, except that an error message is printed
1190 * if it was an error condition.
1193 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1194 buffer_append(&stderr_buffer, buf, strlen(buf));
1196 /* Mark that we have seen EOF. */
1199 * Send an EOF message to the server unless there is
1200 * data in the buffer. If there is data in the
1201 * buffer, no message will be sent now. Code
1202 * elsewhere will send the EOF when the buffer
1203 * becomes empty if stdin_eof is set.
1205 if (buffer_len(&stdin_buffer) == 0) {
1206 packet_start(SSH_CMSG_EOF);
1209 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1211 * Normal successful read, and no escape character.
1212 * Just append the data to buffer.
1214 buffer_append(&stdin_buffer, buf, len);
1217 * Normal, successful read. But we have an escape character
1218 * and have to process the characters one by one.
1220 if (process_escapes(&stdin_buffer, &stdout_buffer,
1221 &stderr_buffer, buf, len) == -1)
1228 client_process_output(fd_set * writeset)
1233 /* Write buffered output to stdout. */
1234 if (FD_ISSET(fileno(stdout), writeset)) {
1235 /* Write as much data as possible. */
1236 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1237 buffer_len(&stdout_buffer));
1239 if (errno == EINTR || errno == EAGAIN)
1243 * An error or EOF was encountered. Put an
1244 * error message to stderr buffer.
1246 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1247 buffer_append(&stderr_buffer, buf, strlen(buf));
1252 /* Consume printed data from the buffer. */
1253 buffer_consume(&stdout_buffer, len);
1254 stdout_bytes += len;
1256 /* Write buffered output to stderr. */
1257 if (FD_ISSET(fileno(stderr), writeset)) {
1258 /* Write as much data as possible. */
1259 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1260 buffer_len(&stderr_buffer));
1262 if (errno == EINTR || errno == EAGAIN)
1265 /* EOF or error, but can't even print error message. */
1270 /* Consume printed characters from the buffer. */
1271 buffer_consume(&stderr_buffer, len);
1272 stderr_bytes += len;
1277 * Get packets from the connection input buffer, and process them as long as
1278 * there are packets available.
1280 * Any unknown packets received during the actual
1281 * session cause the session to terminate. This is
1282 * intended to make debugging easier since no
1283 * confirmations are sent. Any compatible protocol
1284 * extensions must be negotiated during the
1285 * preparatory phase.
1289 client_process_buffered_input_packets(void)
1291 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1294 /* scan buf[] for '~' before sending data to the peer */
1297 simple_escape_filter(Channel *c, char *buf, int len)
1299 /* XXX we assume c->extended is writeable */
1300 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1304 client_channel_closed(int id, void *arg)
1306 channel_cancel_cleanup(id);
1312 * Implements the interactive session with the server. This is called after
1313 * the user has been authenticated, and a command has been started on the
1314 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1315 * used as an escape character for terminating or suspending the session.
1319 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1321 fd_set *readset = NULL, *writeset = NULL;
1322 double start_time, total_time;
1323 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1327 debug("Entering interactive session.");
1329 start_time = get_current_time();
1331 /* Initialize variables. */
1336 buffer_high = 64 * 1024;
1337 connection_in = packet_get_connection_in();
1338 connection_out = packet_get_connection_out();
1339 max_fd = MAX(connection_in, connection_out);
1340 if (control_fd != -1)
1341 max_fd = MAX(max_fd, control_fd);
1344 /* enable nonblocking unless tty */
1345 if (!isatty(fileno(stdin)))
1346 set_nonblock(fileno(stdin));
1347 if (!isatty(fileno(stdout)))
1348 set_nonblock(fileno(stdout));
1349 if (!isatty(fileno(stderr)))
1350 set_nonblock(fileno(stderr));
1351 max_fd = MAX(max_fd, fileno(stdin));
1352 max_fd = MAX(max_fd, fileno(stdout));
1353 max_fd = MAX(max_fd, fileno(stderr));
1359 escape_char = escape_char_arg;
1361 /* Initialize buffers. */
1362 buffer_init(&stdin_buffer);
1363 buffer_init(&stdout_buffer);
1364 buffer_init(&stderr_buffer);
1366 client_init_dispatch();
1369 * Set signal handlers, (e.g. to restore non-blocking mode)
1370 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1372 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1373 signal(SIGHUP, signal_handler);
1374 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1375 signal(SIGINT, signal_handler);
1376 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1377 signal(SIGQUIT, signal_handler);
1378 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1379 signal(SIGTERM, signal_handler);
1380 signal(SIGWINCH, window_change_handler);
1386 session_ident = ssh2_chan_id;
1387 if (escape_char != SSH_ESCAPECHAR_NONE)
1388 channel_register_filter(session_ident,
1389 simple_escape_filter);
1390 if (session_ident != -1)
1391 channel_register_cleanup(session_ident,
1392 client_channel_closed, 0);
1394 /* Check if we should immediately send eof on stdin. */
1395 client_check_initial_eof_on_stdin();
1398 /* Main loop of the client for the interactive session mode. */
1399 while (!quit_pending) {
1401 /* Process buffered packets sent by the server. */
1402 client_process_buffered_input_packets();
1404 if (compat20 && session_closed && !channel_still_open())
1407 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1410 debug("rekeying in progress");
1413 * Make packets of buffered stdin data, and buffer
1414 * them for sending to the server.
1417 client_make_packets_from_stdin_data();
1420 * Make packets from buffered channel data, and
1421 * enqueue them for sending to the server.
1423 if (packet_not_very_much_data_to_write())
1424 channel_output_poll();
1427 * Check if the window size has changed, and buffer a
1428 * message about it to the server if so.
1430 client_check_window_change();
1436 * Wait until we have something to do (something becomes
1437 * available on one of the descriptors).
1440 client_wait_until_can_do_something(&readset, &writeset,
1441 &max_fd2, &nalloc, rekeying);
1446 /* Do channel operations unless rekeying in progress. */
1448 channel_after_select(readset, writeset);
1449 if (need_rekeying || packet_need_rekeying()) {
1450 debug("need rekeying");
1452 kex_send_kexinit(xxx_kex);
1457 /* Buffer input from the connection. */
1458 client_process_net_input(readset);
1460 /* Accept control connections. */
1461 client_process_control(readset);
1467 /* Buffer data from stdin */
1468 client_process_input(readset);
1470 * Process output to stdout and stderr. Output to
1471 * the connection is processed elsewhere (above).
1473 client_process_output(writeset);
1476 /* Send as much buffered packet data as possible to the sender. */
1477 if (FD_ISSET(connection_out, writeset))
1478 packet_write_poll();
1485 /* Terminate the session. */
1487 /* Stop watching for window change. */
1488 signal(SIGWINCH, SIG_DFL);
1495 /* restore blocking io */
1496 if (!isatty(fileno(stdin)))
1497 unset_nonblock(fileno(stdin));
1498 if (!isatty(fileno(stdout)))
1499 unset_nonblock(fileno(stdout));
1500 if (!isatty(fileno(stderr)))
1501 unset_nonblock(fileno(stderr));
1504 * If there was no shell or command requested, there will be no remote
1505 * exit status to be returned. In that case, clear error code if the
1506 * connection was deliberately terminated at this end.
1508 if (no_shell_flag && received_signal == SIGTERM) {
1509 received_signal = 0;
1513 if (received_signal)
1514 fatal("Killed by signal %d.", (int) received_signal);
1517 * In interactive mode (with pseudo tty) display a message indicating
1518 * that the connection has been closed.
1520 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1521 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1522 buffer_append(&stderr_buffer, buf, strlen(buf));
1525 /* Output any buffered data for stdout. */
1526 while (buffer_len(&stdout_buffer) > 0) {
1527 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1528 buffer_len(&stdout_buffer));
1530 error("Write failed flushing stdout buffer.");
1533 buffer_consume(&stdout_buffer, len);
1534 stdout_bytes += len;
1537 /* Output any buffered data for stderr. */
1538 while (buffer_len(&stderr_buffer) > 0) {
1539 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1540 buffer_len(&stderr_buffer));
1542 error("Write failed flushing stderr buffer.");
1545 buffer_consume(&stderr_buffer, len);
1546 stderr_bytes += len;
1549 /* Clear and free any buffers. */
1550 memset(buf, 0, sizeof(buf));
1551 buffer_free(&stdin_buffer);
1552 buffer_free(&stdout_buffer);
1553 buffer_free(&stderr_buffer);
1555 /* Report bytes transferred, and transfer rates. */
1556 total_time = get_current_time() - start_time;
1557 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1558 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1560 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1561 stdin_bytes / total_time, stdout_bytes / total_time,
1562 stderr_bytes / total_time);
1564 /* Return the exit status of the program. */
1565 debug("Exit status %d", exit_status);
1572 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1575 char *data = packet_get_string(&data_len);
1577 buffer_append(&stdout_buffer, data, data_len);
1578 memset(data, 0, data_len);
1582 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1585 char *data = packet_get_string(&data_len);
1587 buffer_append(&stderr_buffer, data, data_len);
1588 memset(data, 0, data_len);
1592 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1594 exit_status = packet_get_int();
1596 /* Acknowledge the exit. */
1597 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1600 * Must wait for packet to be sent since we are
1603 packet_write_wait();
1604 /* Flag that we want to exit. */
1608 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1611 int remote_id, sock;
1613 /* Read the remote channel number from the message. */
1614 remote_id = packet_get_int();
1618 * Get a connection to the local authentication agent (this may again
1621 sock = ssh_get_authentication_socket();
1624 * If we could not connect the agent, send an error message back to
1625 * the server. This should never happen unless the agent dies,
1626 * because authentication forwarding is only enabled if we have an
1630 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1631 -1, 0, 0, 0, "authentication agent connection", 1);
1632 c->remote_id = remote_id;
1636 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1637 packet_put_int(remote_id);
1639 /* Send a confirmation to the remote host. */
1640 debug("Forwarding authentication connection.");
1641 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1642 packet_put_int(remote_id);
1643 packet_put_int(c->self);
1649 client_request_forwarded_tcpip(const char *request_type, int rchan)
1652 char *listen_address, *originator_address;
1653 int listen_port, originator_port;
1656 /* Get rest of the packet */
1657 listen_address = packet_get_string(NULL);
1658 listen_port = packet_get_int();
1659 originator_address = packet_get_string(NULL);
1660 originator_port = packet_get_int();
1663 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1664 listen_address, listen_port, originator_address, originator_port);
1666 sock = channel_connect_by_listen_address(listen_port);
1668 xfree(originator_address);
1669 xfree(listen_address);
1672 c = channel_new("forwarded-tcpip",
1673 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1674 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1675 originator_address, 1);
1676 xfree(originator_address);
1677 xfree(listen_address);
1682 client_request_x11(const char *request_type, int rchan)
1686 int originator_port;
1689 if (!options.forward_x11) {
1690 error("Warning: ssh server tried X11 forwarding.");
1691 error("Warning: this is probably a break in attempt by a malicious server.");
1694 originator = packet_get_string(NULL);
1695 if (datafellows & SSH_BUG_X11FWD) {
1696 debug2("buggy server: x11 request w/o originator_port");
1697 originator_port = 0;
1699 originator_port = packet_get_int();
1702 /* XXX check permission */
1703 debug("client_request_x11: request from %s %d", originator,
1706 sock = x11_connect_display();
1709 c = channel_new("x11",
1710 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1711 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1717 client_request_agent(const char *request_type, int rchan)
1722 if (!options.forward_agent) {
1723 error("Warning: ssh server tried agent forwarding.");
1724 error("Warning: this is probably a break in attempt by a malicious server.");
1727 sock = ssh_get_authentication_socket();
1730 c = channel_new("authentication agent connection",
1731 SSH_CHANNEL_OPEN, sock, sock, -1,
1732 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1733 "authentication agent connection", 1);
1738 /* XXXX move to generic input handler */
1740 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1745 u_int rmaxpack, rwindow, len;
1747 ctype = packet_get_string(&len);
1748 rchan = packet_get_int();
1749 rwindow = packet_get_int();
1750 rmaxpack = packet_get_int();
1752 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1753 ctype, rchan, rwindow, rmaxpack);
1755 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1756 c = client_request_forwarded_tcpip(ctype, rchan);
1757 } else if (strcmp(ctype, "x11") == 0) {
1758 c = client_request_x11(ctype, rchan);
1759 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1760 c = client_request_agent(ctype, rchan);
1762 /* XXX duplicate : */
1764 debug("confirm %s", ctype);
1765 c->remote_id = rchan;
1766 c->remote_window = rwindow;
1767 c->remote_maxpacket = rmaxpack;
1768 if (c->type != SSH_CHANNEL_CONNECTING) {
1769 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1770 packet_put_int(c->remote_id);
1771 packet_put_int(c->self);
1772 packet_put_int(c->local_window);
1773 packet_put_int(c->local_maxpacket);
1777 debug("failure %s", ctype);
1778 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1779 packet_put_int(rchan);
1780 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1781 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1782 packet_put_cstring("open failed");
1783 packet_put_cstring("");
1790 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1793 int exitval, id, reply, success = 0;
1796 id = packet_get_int();
1797 rtype = packet_get_string(NULL);
1798 reply = packet_get_char();
1800 debug("client_input_channel_req: channel %d rtype %s reply %d",
1804 error("client_input_channel_req: request for channel -1");
1805 } else if ((c = channel_lookup(id)) == NULL) {
1806 error("client_input_channel_req: channel %d: unknown channel", id);
1807 } else if (strcmp(rtype, "exit-status") == 0) {
1808 exitval = packet_get_int();
1809 if (id == session_ident) {
1811 exit_status = exitval;
1812 } else if (c->ctl_fd == -1) {
1813 error("client_input_channel_req: unexpected channel %d",
1816 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1822 packet_start(success ?
1823 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1830 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1836 rtype = packet_get_string(NULL);
1837 want_reply = packet_get_char();
1838 debug("client_input_global_request: rtype %s want_reply %d",
1841 packet_start(success ?
1842 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1844 packet_write_wait();
1850 client_session2_setup(int id, int want_tty, int want_subsystem,
1851 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1852 dispatch_fn *subsys_repl)
1857 debug2("%s: id %d", __func__, id);
1859 if ((c = channel_lookup(id)) == NULL)
1860 fatal("client_session2_setup: channel %d: unknown channel", id);
1866 /* Store window size in the packet. */
1867 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1868 memset(&ws, 0, sizeof(ws));
1870 channel_request_start(id, "pty-req", 0);
1871 packet_put_cstring(term != NULL ? term : "");
1872 packet_put_int(ws.ws_col);
1873 packet_put_int(ws.ws_row);
1874 packet_put_int(ws.ws_xpixel);
1875 packet_put_int(ws.ws_ypixel);
1876 tio = get_saved_tio();
1877 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1879 /* XXX wait for reply */
1883 /* Transfer any environment variables from client to server */
1884 if (options.num_send_env != 0 && env != NULL) {
1888 debug("Sending environment.");
1889 for (i = 0; env[i] != NULL; i++) {
1891 name = xstrdup(env[i]);
1892 if ((val = strchr(name, '=')) == NULL) {
1899 for (j = 0; j < options.num_send_env; j++) {
1900 if (match_pattern(name, options.send_env[j])) {
1906 debug3("Ignored env %s", name);
1911 debug("Sending env %s = %s", name, val);
1912 channel_request_start(id, "env", 0);
1913 packet_put_cstring(name);
1914 packet_put_cstring(val);
1920 len = buffer_len(cmd);
1924 if (want_subsystem) {
1925 debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1926 channel_request_start(id, "subsystem", subsys_repl != NULL);
1927 if (subsys_repl != NULL) {
1928 /* register callback for reply */
1929 /* XXX we assume that client_loop has already been called */
1930 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1931 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1934 debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1935 channel_request_start(id, "exec", 0);
1937 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1940 channel_request_start(id, "shell", 0);
1946 client_init_dispatch_20(void)
1948 dispatch_init(&dispatch_protocol_error);
1950 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1951 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1952 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1953 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1954 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1955 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1956 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1957 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1958 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1959 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1962 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1964 /* global request reply messages */
1965 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1966 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1969 client_init_dispatch_13(void)
1971 dispatch_init(NULL);
1972 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1973 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1974 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1975 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1976 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1977 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1978 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1979 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1980 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1982 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1983 &client_input_agent_open : &deny_input_open);
1984 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1985 &x11_input_open : &deny_input_open);
1988 client_init_dispatch_15(void)
1990 client_init_dispatch_13();
1991 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1992 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1995 client_init_dispatch(void)
1998 client_init_dispatch_20();
2000 client_init_dispatch_13();
2002 client_init_dispatch_15();
2005 /* client specific fatal cleanup */
2010 leave_non_blocking();
2011 if (options.control_path != NULL && control_fd != -1)
2012 unlink(options.control_path);