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 1.155 2006/02/22 00:04:44 stevesk Exp $");
64 #include <sys/types.h>
65 #ifdef HAVE_SYS_STAT_H
66 # include <sys/stat.h>
68 #include <sys/ioctl.h>
90 #include "clientloop.h"
91 #include "sshconnect.h"
96 #include "monitor_fdpass.h"
101 extern Options options;
103 /* Flag indicating that stdin should be redirected from /dev/null. */
104 extern int stdin_null_flag;
106 /* Flag indicating that no shell has been requested */
107 extern int no_shell_flag;
110 extern int control_fd;
113 * Name of the host we are connecting to. This is the name given on the
114 * command line, or the HostName specified for the user-supplied name in a
115 * configuration file.
120 * Flag to indicate that we have received a window change signal which has
121 * not yet been processed. This will cause a message indicating the new
122 * window size to be sent to the server a little later. This is volatile
123 * because this is updated in a signal handler.
125 static volatile sig_atomic_t received_window_change_signal = 0;
126 static volatile sig_atomic_t received_signal = 0;
128 /* Flag indicating whether the user's terminal is in non-blocking mode. */
129 static int in_non_blocking_mode = 0;
131 /* Common data for the client loop code. */
132 static int quit_pending; /* Set to non-zero to quit the client loop. */
133 static int escape_char; /* Escape character. */
134 static int escape_pending; /* Last character was the escape character */
135 static int last_was_cr; /* Last character was a newline. */
136 static int exit_status; /* Used to store the exit status of the command. */
137 static int stdin_eof; /* EOF has been encountered on standard error. */
138 static Buffer stdin_buffer; /* Buffer for stdin data. */
139 static Buffer stdout_buffer; /* Buffer for stdout data. */
140 static Buffer stderr_buffer; /* Buffer for stderr data. */
141 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
142 static u_int buffer_high;/* Soft max buffer size. */
143 static int connection_in; /* Connection to server (input). */
144 static int connection_out; /* Connection to server (output). */
145 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
146 static int session_closed = 0; /* In SSH2: login session closed. */
147 static int server_alive_timeouts = 0;
149 static void client_init_dispatch(void);
150 int session_ident = -1;
166 void ssh_process_session2_setup(int, int, int, Buffer *);
168 /* Restores stdin to blocking mode. */
171 leave_non_blocking(void)
173 if (in_non_blocking_mode) {
174 unset_nonblock(fileno(stdin));
175 in_non_blocking_mode = 0;
179 /* Puts stdin terminal in non-blocking mode. */
182 enter_non_blocking(void)
184 in_non_blocking_mode = 1;
185 set_nonblock(fileno(stdin));
189 * Signal handler for the window change signal (SIGWINCH). This just sets a
190 * flag indicating that the window has changed.
194 window_change_handler(int sig)
196 received_window_change_signal = 1;
197 signal(SIGWINCH, window_change_handler);
201 * Signal handler for signals that cause the program to terminate. These
202 * signals must be trapped to restore terminal modes.
206 signal_handler(int sig)
208 received_signal = sig;
213 * Returns current time in seconds from Jan 1, 1970 with the maximum
214 * available resolution.
218 get_current_time(void)
221 gettimeofday(&tv, NULL);
222 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
225 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
227 client_x11_get_proto(const char *display, const char *xauth_path,
228 u_int trusted, char **_proto, char **_data)
233 static char proto[512], data[512];
235 int got_data = 0, generated = 0, do_unlink = 0, i;
236 char *xauthdir, *xauthfile;
239 xauthdir = xauthfile = NULL;
242 proto[0] = data[0] = '\0';
244 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
245 debug("No xauth program.");
247 if (display == NULL) {
248 debug("x11_get_proto: DISPLAY not set");
252 * Handle FamilyLocal case where $DISPLAY does
253 * not match an authorization entry. For this we
254 * just try "xauth list unix:displaynum.screennum".
255 * XXX: "localhost" match to determine FamilyLocal
258 if (strncmp(display, "localhost:", 10) == 0) {
259 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
264 xauthdir = xmalloc(MAXPATHLEN);
265 xauthfile = xmalloc(MAXPATHLEN);
266 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
267 if (mkdtemp(xauthdir) != NULL) {
269 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
271 snprintf(cmd, sizeof(cmd),
272 "%s -f %s generate %s " SSH_X11_PROTO
273 " untrusted timeout 1200 2>" _PATH_DEVNULL,
274 xauth_path, xauthfile, display);
275 debug2("x11_get_proto: %s", cmd);
276 if (system(cmd) == 0)
280 snprintf(cmd, sizeof(cmd),
281 "%s %s%s list %s 2>" _PATH_DEVNULL,
283 generated ? "-f " : "" ,
284 generated ? xauthfile : "",
286 debug2("x11_get_proto: %s", cmd);
288 if (f && fgets(line, sizeof(line), f) &&
289 sscanf(line, "%*s %511s %511s", proto, data) == 2)
305 * If we didn't get authentication data, just make up some
306 * data. The forwarding code will check the validity of the
307 * response anyway, and substitute this data. The X11
308 * server, however, will ignore this fake data and use
309 * whatever authentication mechanisms it was using otherwise
310 * for the local connection.
315 logit("Warning: No xauth data; "
316 "using fake authentication data for X11 forwarding.");
317 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
318 for (i = 0; i < 16; i++) {
321 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
329 * This is called when the interactive is entered. This checks if there is
330 * an EOF coming on stdin. We must check this explicitly, as select() does
331 * not appear to wake up when redirecting from /dev/null.
335 client_check_initial_eof_on_stdin(void)
341 * If standard input is to be "redirected from /dev/null", we simply
342 * mark that we have seen an EOF and send an EOF message to the
343 * server. Otherwise, we try to read a single character; it appears
344 * that for some files, such /dev/null, select() never wakes up for
345 * read for this descriptor, which means that we never get EOF. This
346 * way we will get the EOF if stdin comes from /dev/null or similar.
348 if (stdin_null_flag) {
349 /* Fake EOF on stdin. */
350 debug("Sending eof.");
352 packet_start(SSH_CMSG_EOF);
355 enter_non_blocking();
357 /* Check for immediate EOF on stdin. */
358 len = read(fileno(stdin), buf, 1);
360 /* EOF. Record that we have seen it and send EOF to server. */
361 debug("Sending eof.");
363 packet_start(SSH_CMSG_EOF);
365 } else if (len > 0) {
367 * Got data. We must store the data in the buffer,
368 * and also process it as an escape character if
371 if ((u_char) buf[0] == escape_char)
374 buffer_append(&stdin_buffer, buf, 1);
376 leave_non_blocking();
382 * Make packets from buffered stdin data, and buffer them for sending to the
387 client_make_packets_from_stdin_data(void)
391 /* Send buffered stdin data to the server. */
392 while (buffer_len(&stdin_buffer) > 0 &&
393 packet_not_very_much_data_to_write()) {
394 len = buffer_len(&stdin_buffer);
395 /* Keep the packets at reasonable size. */
396 if (len > packet_get_maxsize())
397 len = packet_get_maxsize();
398 packet_start(SSH_CMSG_STDIN_DATA);
399 packet_put_string(buffer_ptr(&stdin_buffer), len);
401 buffer_consume(&stdin_buffer, len);
403 /* If we have a pending EOF, send it now. */
404 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
405 packet_start(SSH_CMSG_EOF);
412 * Checks if the client window has changed, and sends a packet about it to
413 * the server if so. The actual change is detected elsewhere (by a software
414 * interrupt on Unix); this just checks the flag and sends a message if
419 client_check_window_change(void)
423 if (! received_window_change_signal)
426 received_window_change_signal = 0;
428 debug2("client_check_window_change: changed");
431 channel_send_window_changes();
433 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
435 packet_start(SSH_CMSG_WINDOW_SIZE);
436 packet_put_int(ws.ws_row);
437 packet_put_int(ws.ws_col);
438 packet_put_int(ws.ws_xpixel);
439 packet_put_int(ws.ws_ypixel);
445 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
447 server_alive_timeouts = 0;
448 client_global_request_reply_fwd(type, seq, ctxt);
452 server_alive_check(void)
454 if (++server_alive_timeouts > options.server_alive_count_max)
455 packet_disconnect("Timeout, server not responding.");
456 packet_start(SSH2_MSG_GLOBAL_REQUEST);
457 packet_put_cstring("keepalive@openssh.com");
458 packet_put_char(1); /* boolean: want reply */
463 * Waits until the client can do something (some data becomes available on
464 * one of the file descriptors).
467 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
468 int *maxfdp, u_int *nallocp, int rekeying)
470 struct timeval tv, *tvp;
473 /* Add any selections by the channel mechanism. */
474 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
477 /* Read from the connection, unless our buffers are full. */
478 if (buffer_len(&stdout_buffer) < buffer_high &&
479 buffer_len(&stderr_buffer) < buffer_high &&
480 channel_not_very_much_buffered_data())
481 FD_SET(connection_in, *readsetp);
483 * Read from stdin, unless we have seen EOF or have very much
484 * buffered data to send to the server.
486 if (!stdin_eof && packet_not_very_much_data_to_write())
487 FD_SET(fileno(stdin), *readsetp);
489 /* Select stdout/stderr if have data in buffer. */
490 if (buffer_len(&stdout_buffer) > 0)
491 FD_SET(fileno(stdout), *writesetp);
492 if (buffer_len(&stderr_buffer) > 0)
493 FD_SET(fileno(stderr), *writesetp);
495 /* channel_prepare_select could have closed the last channel */
496 if (session_closed && !channel_still_open() &&
497 !packet_have_data_to_write()) {
498 /* clear mask since we did not call select() */
499 memset(*readsetp, 0, *nallocp);
500 memset(*writesetp, 0, *nallocp);
503 FD_SET(connection_in, *readsetp);
507 /* Select server connection if have data to write to the server. */
508 if (packet_have_data_to_write())
509 FD_SET(connection_out, *writesetp);
511 if (control_fd != -1)
512 FD_SET(control_fd, *readsetp);
515 * Wait for something to happen. This will suspend the process until
516 * some selected descriptor can be read, written, or has some other
520 if (options.server_alive_interval == 0 || !compat20)
523 tv.tv_sec = options.server_alive_interval;
527 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
532 * We have to clear the select masks, because we return.
533 * We have to return, because the mainloop checks for the flags
534 * set by the signal handlers.
536 memset(*readsetp, 0, *nallocp);
537 memset(*writesetp, 0, *nallocp);
541 /* Note: we might still have data in the buffers. */
542 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
543 buffer_append(&stderr_buffer, buf, strlen(buf));
546 server_alive_check();
550 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
552 /* Flush stdout and stderr buffers. */
553 if (buffer_len(bout) > 0)
554 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
555 if (buffer_len(berr) > 0)
556 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
561 * Free (and clear) the buffer to reduce the amount of data that gets
568 /* Send the suspend signal to the program itself. */
569 kill(getpid(), SIGTSTP);
571 /* Reset window sizes in case they have changed */
572 received_window_change_signal = 1;
574 /* OK, we have been continued by the user. Reinitialize buffers. */
583 client_process_net_input(fd_set * readset)
589 * Read input from the server, and add any such data to the buffer of
590 * the packet subsystem.
592 if (FD_ISSET(connection_in, readset)) {
593 /* Read as much as possible. */
594 len = read(connection_in, buf, sizeof(buf));
596 /* Received EOF. The remote host has closed the connection. */
597 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
599 buffer_append(&stderr_buffer, buf, strlen(buf));
604 * There is a kernel bug on Solaris that causes select to
605 * sometimes wake up even though there is no data available.
607 if (len < 0 && (errno == EAGAIN || errno == EINTR))
611 /* An error has encountered. Perhaps there is a network problem. */
612 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
613 host, strerror(errno));
614 buffer_append(&stderr_buffer, buf, strlen(buf));
618 packet_process_incoming(buf, len);
623 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
628 id = packet_get_int();
631 if ((c = channel_lookup(id)) == NULL) {
632 error("%s: no channel for id %d", __func__, id);
636 if (type == SSH2_MSG_CHANNEL_SUCCESS)
637 debug2("Request suceeded on channel %d", id);
638 else if (type == SSH2_MSG_CHANNEL_FAILURE) {
639 error("Request failed on channel %d", id);
645 client_extra_session2_setup(int id, void *arg)
647 struct confirm_ctx *cctx = arg;
653 fatal("%s: cctx == NULL", __func__);
654 if ((c = channel_lookup(id)) == NULL)
655 fatal("%s: no channel for id %d", __func__, id);
657 display = getenv("DISPLAY");
658 if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
660 /* Get reasonable local authentication information. */
661 client_x11_get_proto(display, options.xauth_location,
662 options.forward_x11_trusted, &proto, &data);
663 /* Request forwarding with authentication spoofing. */
664 debug("Requesting X11 forwarding with authentication spoofing.");
665 x11_request_forwarding_with_spoofing(id, display, proto, data);
666 /* XXX wait for reply */
669 if (cctx->want_agent_fwd && options.forward_agent) {
670 debug("Requesting authentication agent forwarding.");
671 channel_request_start(id, "auth-agent-req@openssh.com", 0);
675 client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
676 cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
677 client_subsystem_reply);
679 c->confirm_ctx = NULL;
680 buffer_free(&cctx->cmd);
682 if (cctx->env != NULL) {
683 for (i = 0; cctx->env[i] != NULL; i++)
691 client_process_control(fd_set * readset)
695 int client_fd, new_fd[3], ver, allowed;
697 struct sockaddr_storage addr;
698 struct confirm_ctx *cctx;
700 u_int i, len, env_len, command, flags;
705 * Accept connection on control socket
707 if (control_fd == -1 || !FD_ISSET(control_fd, readset))
710 memset(&addr, 0, sizeof(addr));
711 addrlen = sizeof(addr);
712 if ((client_fd = accept(control_fd,
713 (struct sockaddr*)&addr, &addrlen)) == -1) {
714 error("%s accept: %s", __func__, strerror(errno));
718 if (getpeereid(client_fd, &euid, &egid) < 0) {
719 error("%s getpeereid failed: %s", __func__, strerror(errno));
723 if ((euid != 0) && (getuid() != euid)) {
724 error("control mode uid mismatch: peer euid %u != uid %u",
725 (u_int) euid, (u_int) getuid());
730 unset_nonblock(client_fd);
734 if (ssh_msg_recv(client_fd, &m) == -1) {
735 error("%s: client msg_recv failed", __func__);
740 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
741 error("%s: wrong client version %d", __func__, ver);
748 command = buffer_get_int(&m);
749 flags = buffer_get_int(&m);
754 case SSHMUX_COMMAND_OPEN:
755 if (options.control_master == SSHCTL_MASTER_ASK ||
756 options.control_master == SSHCTL_MASTER_AUTO_ASK)
757 allowed = ask_permission("Allow shared connection "
761 case SSHMUX_COMMAND_TERMINATE:
762 if (options.control_master == SSHCTL_MASTER_ASK ||
763 options.control_master == SSHCTL_MASTER_AUTO_ASK)
764 allowed = ask_permission("Terminate shared connection "
769 case SSHMUX_COMMAND_ALIVE_CHECK:
770 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
772 buffer_put_int(&m, allowed);
773 buffer_put_int(&m, getpid());
774 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
775 error("%s: client msg_send failed", __func__);
784 error("Unsupported command %d", command);
790 /* Reply for SSHMUX_COMMAND_OPEN */
792 buffer_put_int(&m, allowed);
793 buffer_put_int(&m, getpid());
794 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
795 error("%s: client msg_send failed", __func__);
802 error("Refused control connection");
809 if (ssh_msg_recv(client_fd, &m) == -1) {
810 error("%s: client msg_recv failed", __func__);
815 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
816 error("%s: wrong client version %d", __func__, ver);
822 cctx = xmalloc(sizeof(*cctx));
823 memset(cctx, 0, sizeof(*cctx));
824 cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
825 cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
826 cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
827 cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
828 cctx->term = buffer_get_string(&m, &len);
830 cmd = buffer_get_string(&m, &len);
831 buffer_init(&cctx->cmd);
832 buffer_append(&cctx->cmd, cmd, strlen(cmd));
834 env_len = buffer_get_int(&m);
835 env_len = MIN(env_len, 4096);
836 debug3("%s: receiving %d env vars", __func__, env_len);
838 cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
839 for (i = 0; i < env_len; i++)
840 cctx->env[i] = buffer_get_string(&m, &len);
844 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
845 cctx->want_tty, cctx->want_subsys, cmd);
847 /* Gather fds from client */
848 new_fd[0] = mm_receive_fd(client_fd);
849 new_fd[1] = mm_receive_fd(client_fd);
850 new_fd[2] = mm_receive_fd(client_fd);
852 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
853 new_fd[0], new_fd[1], new_fd[2]);
855 /* Try to pick up ttymodes from client before it goes raw */
856 if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
857 error("%s: tcgetattr: %s", __func__, strerror(errno));
859 /* This roundtrip is just for synchronisation of ttymodes */
861 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
862 error("%s: client msg_send failed", __func__);
870 for (i = 0; i < env_len; i++)
878 /* enable nonblocking unless tty */
879 if (!isatty(new_fd[0]))
880 set_nonblock(new_fd[0]);
881 if (!isatty(new_fd[1]))
882 set_nonblock(new_fd[1]);
883 if (!isatty(new_fd[2]))
884 set_nonblock(new_fd[2]);
886 set_nonblock(client_fd);
888 c = channel_new("session", SSH_CHANNEL_OPENING,
889 new_fd[0], new_fd[1], new_fd[2],
890 CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
891 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
894 c->ctl_fd = client_fd;
896 debug3("%s: channel_new: %d", __func__, c->self);
898 channel_send_open(c->self);
899 channel_register_confirm(c->self, client_extra_session2_setup, cctx);
903 process_cmdline(void)
905 void (*handler)(int);
906 char *s, *cmd, *cancel_host;
913 handler = signal(SIGINT, SIG_IGN);
914 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
917 while (*s && isspace(*s))
920 s++; /* Skip cmdline '-', if any */
924 if (*s == 'h' || *s == 'H' || *s == '?') {
926 logit(" -Lport:host:hostport Request local forward");
927 logit(" -Rport:host:hostport Request remote forward");
928 logit(" -KRhostport Cancel remote forward");
929 if (!options.permit_local_command)
931 logit(" !args Execute local command");
935 if (*s == '!' && options.permit_local_command) {
945 if (*s != 'L' && *s != 'R') {
946 logit("Invalid command.");
951 if (local && delete) {
952 logit("Not supported.");
955 if ((!local || delete) && !compat20) {
956 logit("Not supported for SSH protocol version 1.");
961 while (*s && isspace(*s))
966 cancel_host = hpdelim(&s); /* may be NULL */
968 cancel_port = a2port(s);
969 cancel_host = cleanhostname(cancel_host);
971 cancel_port = a2port(cancel_host);
974 if (cancel_port == 0) {
975 logit("Bad forwarding close port");
978 channel_request_rforward_cancel(cancel_host, cancel_port);
980 if (!parse_forward(&fwd, s)) {
981 logit("Bad forwarding specification.");
985 if (channel_setup_local_fwd_listener(fwd.listen_host,
986 fwd.listen_port, fwd.connect_host,
987 fwd.connect_port, options.gateway_ports) < 0) {
988 logit("Port forwarding failed.");
992 channel_request_remote_forwarding(fwd.listen_host,
993 fwd.listen_port, fwd.connect_host,
997 logit("Forwarding port.");
1001 signal(SIGINT, handler);
1007 /* process the characters one by one */
1009 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1021 for (i = 0; i < (u_int)len; i++) {
1022 /* Get one character at a time. */
1025 if (escape_pending) {
1026 /* We have previously seen an escape character. */
1027 /* Clear the flag now. */
1030 /* Process the escaped character. */
1033 /* Terminate the connection. */
1034 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1035 buffer_append(berr, string, strlen(string));
1041 /* Suspend the program. */
1042 /* Print a message to that effect to the user. */
1043 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1044 buffer_append(berr, string, strlen(string));
1046 /* Restore terminal modes and suspend. */
1047 client_suspend_self(bin, bout, berr);
1049 /* We have been continued. */
1054 snprintf(string, sizeof string,
1055 "%cB\r\n", escape_char);
1056 buffer_append(berr, string,
1058 channel_request_start(session_ident,
1060 packet_put_int(1000);
1067 if (datafellows & SSH_BUG_NOREKEY)
1068 logit("Server does not support re-keying");
1076 * Detach the program (continue to serve connections,
1077 * but put in background and no more new connections).
1079 /* Restore tty modes. */
1082 /* Stop listening for new connections. */
1083 channel_stop_listening();
1085 snprintf(string, sizeof string,
1086 "%c& [backgrounded]\n", escape_char);
1087 buffer_append(berr, string, strlen(string));
1089 /* Fork into background. */
1092 error("fork: %.100s", strerror(errno));
1095 if (pid != 0) { /* This is the parent. */
1096 /* The parent just exits. */
1099 /* The child continues serving connections. */
1101 buffer_append(bin, "\004", 1);
1102 /* fake EOF on stdin */
1104 } else if (!stdin_eof) {
1106 * Sending SSH_CMSG_EOF alone does not always appear
1107 * to be enough. So we try to send an EOF character
1110 packet_start(SSH_CMSG_STDIN_DATA);
1111 packet_put_string("\004", 1);
1115 if (buffer_len(bin) == 0) {
1116 packet_start(SSH_CMSG_EOF);
1123 snprintf(string, sizeof string,
1125 Supported escape sequences:\r\n\
1126 %c. - terminate connection\r\n\
1127 %cB - send a BREAK to the remote system\r\n\
1128 %cC - open a command line\r\n\
1129 %cR - Request rekey (SSH protocol 2 only)\r\n\
1130 %c^Z - suspend ssh\r\n\
1131 %c# - list forwarded connections\r\n\
1132 %c& - background ssh (when waiting for connections to terminate)\r\n\
1133 %c? - this message\r\n\
1134 %c%c - send the escape character by typing it twice\r\n\
1135 (Note that escapes are only recognized immediately after newline.)\r\n",
1136 escape_char, escape_char, escape_char, escape_char,
1137 escape_char, escape_char, escape_char, escape_char,
1138 escape_char, escape_char, escape_char);
1139 buffer_append(berr, string, strlen(string));
1143 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1144 buffer_append(berr, string, strlen(string));
1145 s = channel_open_message();
1146 buffer_append(berr, s, strlen(s));
1155 if (ch != escape_char) {
1156 buffer_put_char(bin, escape_char);
1159 /* Escaped characters fall through here */
1164 * The previous character was not an escape char. Check if this
1167 if (last_was_cr && ch == escape_char) {
1168 /* It is. Set the flag and continue to next character. */
1175 * Normal character. Record whether it was a newline,
1176 * and append it to the buffer.
1178 last_was_cr = (ch == '\r' || ch == '\n');
1179 buffer_put_char(bin, ch);
1186 client_process_input(fd_set * readset)
1191 /* Read input from stdin. */
1192 if (FD_ISSET(fileno(stdin), readset)) {
1193 /* Read as much as possible. */
1194 len = read(fileno(stdin), buf, sizeof(buf));
1195 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1196 return; /* we'll try again later */
1199 * Received EOF or error. They are treated
1200 * similarly, except that an error message is printed
1201 * if it was an error condition.
1204 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1205 buffer_append(&stderr_buffer, buf, strlen(buf));
1207 /* Mark that we have seen EOF. */
1210 * Send an EOF message to the server unless there is
1211 * data in the buffer. If there is data in the
1212 * buffer, no message will be sent now. Code
1213 * elsewhere will send the EOF when the buffer
1214 * becomes empty if stdin_eof is set.
1216 if (buffer_len(&stdin_buffer) == 0) {
1217 packet_start(SSH_CMSG_EOF);
1220 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1222 * Normal successful read, and no escape character.
1223 * Just append the data to buffer.
1225 buffer_append(&stdin_buffer, buf, len);
1228 * Normal, successful read. But we have an escape character
1229 * and have to process the characters one by one.
1231 if (process_escapes(&stdin_buffer, &stdout_buffer,
1232 &stderr_buffer, buf, len) == -1)
1239 client_process_output(fd_set * writeset)
1244 /* Write buffered output to stdout. */
1245 if (FD_ISSET(fileno(stdout), writeset)) {
1246 /* Write as much data as possible. */
1247 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1248 buffer_len(&stdout_buffer));
1250 if (errno == EINTR || errno == EAGAIN)
1254 * An error or EOF was encountered. Put an
1255 * error message to stderr buffer.
1257 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1258 buffer_append(&stderr_buffer, buf, strlen(buf));
1263 /* Consume printed data from the buffer. */
1264 buffer_consume(&stdout_buffer, len);
1265 stdout_bytes += len;
1267 /* Write buffered output to stderr. */
1268 if (FD_ISSET(fileno(stderr), writeset)) {
1269 /* Write as much data as possible. */
1270 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1271 buffer_len(&stderr_buffer));
1273 if (errno == EINTR || errno == EAGAIN)
1276 /* EOF or error, but can't even print error message. */
1281 /* Consume printed characters from the buffer. */
1282 buffer_consume(&stderr_buffer, len);
1283 stderr_bytes += len;
1288 * Get packets from the connection input buffer, and process them as long as
1289 * there are packets available.
1291 * Any unknown packets received during the actual
1292 * session cause the session to terminate. This is
1293 * intended to make debugging easier since no
1294 * confirmations are sent. Any compatible protocol
1295 * extensions must be negotiated during the
1296 * preparatory phase.
1300 client_process_buffered_input_packets(void)
1302 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1305 /* scan buf[] for '~' before sending data to the peer */
1308 simple_escape_filter(Channel *c, char *buf, int len)
1310 /* XXX we assume c->extended is writeable */
1311 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1315 client_channel_closed(int id, void *arg)
1317 channel_cancel_cleanup(id);
1323 * Implements the interactive session with the server. This is called after
1324 * the user has been authenticated, and a command has been started on the
1325 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1326 * used as an escape character for terminating or suspending the session.
1330 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1332 fd_set *readset = NULL, *writeset = NULL;
1333 double start_time, total_time;
1334 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1338 debug("Entering interactive session.");
1340 start_time = get_current_time();
1342 /* Initialize variables. */
1347 buffer_high = 64 * 1024;
1348 connection_in = packet_get_connection_in();
1349 connection_out = packet_get_connection_out();
1350 max_fd = MAX(connection_in, connection_out);
1351 if (control_fd != -1)
1352 max_fd = MAX(max_fd, control_fd);
1355 /* enable nonblocking unless tty */
1356 if (!isatty(fileno(stdin)))
1357 set_nonblock(fileno(stdin));
1358 if (!isatty(fileno(stdout)))
1359 set_nonblock(fileno(stdout));
1360 if (!isatty(fileno(stderr)))
1361 set_nonblock(fileno(stderr));
1362 max_fd = MAX(max_fd, fileno(stdin));
1363 max_fd = MAX(max_fd, fileno(stdout));
1364 max_fd = MAX(max_fd, fileno(stderr));
1370 escape_char = escape_char_arg;
1372 /* Initialize buffers. */
1373 buffer_init(&stdin_buffer);
1374 buffer_init(&stdout_buffer);
1375 buffer_init(&stderr_buffer);
1377 client_init_dispatch();
1380 * Set signal handlers, (e.g. to restore non-blocking mode)
1381 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1383 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1384 signal(SIGHUP, signal_handler);
1385 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1386 signal(SIGINT, signal_handler);
1387 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1388 signal(SIGQUIT, signal_handler);
1389 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1390 signal(SIGTERM, signal_handler);
1391 signal(SIGWINCH, window_change_handler);
1397 session_ident = ssh2_chan_id;
1398 if (escape_char != SSH_ESCAPECHAR_NONE)
1399 channel_register_filter(session_ident,
1400 simple_escape_filter, NULL);
1401 if (session_ident != -1)
1402 channel_register_cleanup(session_ident,
1403 client_channel_closed, 0);
1405 /* Check if we should immediately send eof on stdin. */
1406 client_check_initial_eof_on_stdin();
1409 /* Main loop of the client for the interactive session mode. */
1410 while (!quit_pending) {
1412 /* Process buffered packets sent by the server. */
1413 client_process_buffered_input_packets();
1415 if (compat20 && session_closed && !channel_still_open())
1418 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1421 debug("rekeying in progress");
1424 * Make packets of buffered stdin data, and buffer
1425 * them for sending to the server.
1428 client_make_packets_from_stdin_data();
1431 * Make packets from buffered channel data, and
1432 * enqueue them for sending to the server.
1434 if (packet_not_very_much_data_to_write())
1435 channel_output_poll();
1438 * Check if the window size has changed, and buffer a
1439 * message about it to the server if so.
1441 client_check_window_change();
1447 * Wait until we have something to do (something becomes
1448 * available on one of the descriptors).
1451 client_wait_until_can_do_something(&readset, &writeset,
1452 &max_fd2, &nalloc, rekeying);
1457 /* Do channel operations unless rekeying in progress. */
1459 channel_after_select(readset, writeset);
1460 if (need_rekeying || packet_need_rekeying()) {
1461 debug("need rekeying");
1463 kex_send_kexinit(xxx_kex);
1468 /* Buffer input from the connection. */
1469 client_process_net_input(readset);
1471 /* Accept control connections. */
1472 client_process_control(readset);
1478 /* Buffer data from stdin */
1479 client_process_input(readset);
1481 * Process output to stdout and stderr. Output to
1482 * the connection is processed elsewhere (above).
1484 client_process_output(writeset);
1487 /* Send as much buffered packet data as possible to the sender. */
1488 if (FD_ISSET(connection_out, writeset))
1489 packet_write_poll();
1496 /* Terminate the session. */
1498 /* Stop watching for window change. */
1499 signal(SIGWINCH, SIG_DFL);
1506 /* restore blocking io */
1507 if (!isatty(fileno(stdin)))
1508 unset_nonblock(fileno(stdin));
1509 if (!isatty(fileno(stdout)))
1510 unset_nonblock(fileno(stdout));
1511 if (!isatty(fileno(stderr)))
1512 unset_nonblock(fileno(stderr));
1515 * If there was no shell or command requested, there will be no remote
1516 * exit status to be returned. In that case, clear error code if the
1517 * connection was deliberately terminated at this end.
1519 if (no_shell_flag && received_signal == SIGTERM) {
1520 received_signal = 0;
1524 if (received_signal)
1525 fatal("Killed by signal %d.", (int) received_signal);
1528 * In interactive mode (with pseudo tty) display a message indicating
1529 * that the connection has been closed.
1531 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1532 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1533 buffer_append(&stderr_buffer, buf, strlen(buf));
1536 /* Output any buffered data for stdout. */
1537 while (buffer_len(&stdout_buffer) > 0) {
1538 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1539 buffer_len(&stdout_buffer));
1541 error("Write failed flushing stdout buffer.");
1544 buffer_consume(&stdout_buffer, len);
1545 stdout_bytes += len;
1548 /* Output any buffered data for stderr. */
1549 while (buffer_len(&stderr_buffer) > 0) {
1550 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1551 buffer_len(&stderr_buffer));
1553 error("Write failed flushing stderr buffer.");
1556 buffer_consume(&stderr_buffer, len);
1557 stderr_bytes += len;
1560 /* Clear and free any buffers. */
1561 memset(buf, 0, sizeof(buf));
1562 buffer_free(&stdin_buffer);
1563 buffer_free(&stdout_buffer);
1564 buffer_free(&stderr_buffer);
1566 /* Report bytes transferred, and transfer rates. */
1567 total_time = get_current_time() - start_time;
1568 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1569 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1571 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1572 stdin_bytes / total_time, stdout_bytes / total_time,
1573 stderr_bytes / total_time);
1575 /* Return the exit status of the program. */
1576 debug("Exit status %d", exit_status);
1583 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1586 char *data = packet_get_string(&data_len);
1588 buffer_append(&stdout_buffer, data, data_len);
1589 memset(data, 0, data_len);
1593 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1596 char *data = packet_get_string(&data_len);
1598 buffer_append(&stderr_buffer, data, data_len);
1599 memset(data, 0, data_len);
1603 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1605 exit_status = packet_get_int();
1607 /* Acknowledge the exit. */
1608 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1611 * Must wait for packet to be sent since we are
1614 packet_write_wait();
1615 /* Flag that we want to exit. */
1619 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1622 int remote_id, sock;
1624 /* Read the remote channel number from the message. */
1625 remote_id = packet_get_int();
1629 * Get a connection to the local authentication agent (this may again
1632 sock = ssh_get_authentication_socket();
1635 * If we could not connect the agent, send an error message back to
1636 * the server. This should never happen unless the agent dies,
1637 * because authentication forwarding is only enabled if we have an
1641 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1642 -1, 0, 0, 0, "authentication agent connection", 1);
1643 c->remote_id = remote_id;
1647 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1648 packet_put_int(remote_id);
1650 /* Send a confirmation to the remote host. */
1651 debug("Forwarding authentication connection.");
1652 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1653 packet_put_int(remote_id);
1654 packet_put_int(c->self);
1660 client_request_forwarded_tcpip(const char *request_type, int rchan)
1663 char *listen_address, *originator_address;
1664 int listen_port, originator_port;
1667 /* Get rest of the packet */
1668 listen_address = packet_get_string(NULL);
1669 listen_port = packet_get_int();
1670 originator_address = packet_get_string(NULL);
1671 originator_port = packet_get_int();
1674 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1675 listen_address, listen_port, originator_address, originator_port);
1677 sock = channel_connect_by_listen_address(listen_port);
1679 xfree(originator_address);
1680 xfree(listen_address);
1683 c = channel_new("forwarded-tcpip",
1684 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1685 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1686 originator_address, 1);
1687 xfree(originator_address);
1688 xfree(listen_address);
1693 client_request_x11(const char *request_type, int rchan)
1697 int originator_port;
1700 if (!options.forward_x11) {
1701 error("Warning: ssh server tried X11 forwarding.");
1702 error("Warning: this is probably a break-in attempt by a malicious server.");
1705 originator = packet_get_string(NULL);
1706 if (datafellows & SSH_BUG_X11FWD) {
1707 debug2("buggy server: x11 request w/o originator_port");
1708 originator_port = 0;
1710 originator_port = packet_get_int();
1713 /* XXX check permission */
1714 debug("client_request_x11: request from %s %d", originator,
1717 sock = x11_connect_display();
1720 c = channel_new("x11",
1721 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1722 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1728 client_request_agent(const char *request_type, int rchan)
1733 if (!options.forward_agent) {
1734 error("Warning: ssh server tried agent forwarding.");
1735 error("Warning: this is probably a break-in attempt by a malicious server.");
1738 sock = ssh_get_authentication_socket();
1741 c = channel_new("authentication agent connection",
1742 SSH_CHANNEL_OPEN, sock, sock, -1,
1743 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1744 "authentication agent connection", 1);
1749 /* XXXX move to generic input handler */
1751 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1756 u_int rmaxpack, rwindow, len;
1758 ctype = packet_get_string(&len);
1759 rchan = packet_get_int();
1760 rwindow = packet_get_int();
1761 rmaxpack = packet_get_int();
1763 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1764 ctype, rchan, rwindow, rmaxpack);
1766 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1767 c = client_request_forwarded_tcpip(ctype, rchan);
1768 } else if (strcmp(ctype, "x11") == 0) {
1769 c = client_request_x11(ctype, rchan);
1770 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1771 c = client_request_agent(ctype, rchan);
1773 /* XXX duplicate : */
1775 debug("confirm %s", ctype);
1776 c->remote_id = rchan;
1777 c->remote_window = rwindow;
1778 c->remote_maxpacket = rmaxpack;
1779 if (c->type != SSH_CHANNEL_CONNECTING) {
1780 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1781 packet_put_int(c->remote_id);
1782 packet_put_int(c->self);
1783 packet_put_int(c->local_window);
1784 packet_put_int(c->local_maxpacket);
1788 debug("failure %s", ctype);
1789 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1790 packet_put_int(rchan);
1791 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1792 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1793 packet_put_cstring("open failed");
1794 packet_put_cstring("");
1801 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1804 int exitval, id, reply, success = 0;
1807 id = packet_get_int();
1808 rtype = packet_get_string(NULL);
1809 reply = packet_get_char();
1811 debug("client_input_channel_req: channel %d rtype %s reply %d",
1815 error("client_input_channel_req: request for channel -1");
1816 } else if ((c = channel_lookup(id)) == NULL) {
1817 error("client_input_channel_req: channel %d: unknown channel", id);
1818 } else if (strcmp(rtype, "exit-status") == 0) {
1819 exitval = packet_get_int();
1820 if (id == session_ident) {
1822 exit_status = exitval;
1823 } else if (c->ctl_fd == -1) {
1824 error("client_input_channel_req: unexpected channel %d",
1827 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1833 packet_start(success ?
1834 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1841 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1847 rtype = packet_get_string(NULL);
1848 want_reply = packet_get_char();
1849 debug("client_input_global_request: rtype %s want_reply %d",
1852 packet_start(success ?
1853 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1855 packet_write_wait();
1861 client_session2_setup(int id, int want_tty, int want_subsystem,
1862 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1863 dispatch_fn *subsys_repl)
1868 debug2("%s: id %d", __func__, id);
1870 if ((c = channel_lookup(id)) == NULL)
1871 fatal("client_session2_setup: channel %d: unknown channel", id);
1877 /* Store window size in the packet. */
1878 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1879 memset(&ws, 0, sizeof(ws));
1881 channel_request_start(id, "pty-req", 0);
1882 packet_put_cstring(term != NULL ? term : "");
1883 packet_put_int(ws.ws_col);
1884 packet_put_int(ws.ws_row);
1885 packet_put_int(ws.ws_xpixel);
1886 packet_put_int(ws.ws_ypixel);
1887 tio = get_saved_tio();
1888 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1890 /* XXX wait for reply */
1894 /* Transfer any environment variables from client to server */
1895 if (options.num_send_env != 0 && env != NULL) {
1899 debug("Sending environment.");
1900 for (i = 0; env[i] != NULL; i++) {
1902 name = xstrdup(env[i]);
1903 if ((val = strchr(name, '=')) == NULL) {
1910 for (j = 0; j < options.num_send_env; j++) {
1911 if (match_pattern(name, options.send_env[j])) {
1917 debug3("Ignored env %s", name);
1922 debug("Sending env %s = %s", name, val);
1923 channel_request_start(id, "env", 0);
1924 packet_put_cstring(name);
1925 packet_put_cstring(val);
1931 len = buffer_len(cmd);
1935 if (want_subsystem) {
1936 debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1937 channel_request_start(id, "subsystem", subsys_repl != NULL);
1938 if (subsys_repl != NULL) {
1939 /* register callback for reply */
1940 /* XXX we assume that client_loop has already been called */
1941 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1942 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1945 debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1946 channel_request_start(id, "exec", 0);
1948 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1951 channel_request_start(id, "shell", 0);
1957 client_init_dispatch_20(void)
1959 dispatch_init(&dispatch_protocol_error);
1961 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1962 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1963 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1964 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1965 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1966 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1967 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1968 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1969 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1970 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1973 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1975 /* global request reply messages */
1976 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1977 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1980 client_init_dispatch_13(void)
1982 dispatch_init(NULL);
1983 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1984 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1985 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1986 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1987 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1988 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1989 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1990 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1991 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1993 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1994 &client_input_agent_open : &deny_input_open);
1995 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1996 &x11_input_open : &deny_input_open);
1999 client_init_dispatch_15(void)
2001 client_init_dispatch_13();
2002 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2003 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2006 client_init_dispatch(void)
2009 client_init_dispatch_20();
2011 client_init_dispatch_13();
2013 client_init_dispatch_15();
2016 /* client specific fatal cleanup */
2021 leave_non_blocking();
2022 if (options.control_path != NULL && control_fd != -1)
2023 unlink(options.control_path);