1 /* $OpenBSD: clientloop.c,v 1.181 2007/08/15 08:14:46 markus Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * The main loop for the interactive session (client side).
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
15 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 * SSH2 support added by Markus Friedl.
39 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
50 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
64 #include <sys/types.h>
65 #include <sys/ioctl.h>
66 #include <sys/param.h>
67 #ifdef HAVE_SYS_STAT_H
68 # include <sys/stat.h>
70 #ifdef HAVE_SYS_TIME_H
71 # include <sys/time.h>
73 #include <sys/socket.h>
102 #include "readconf.h"
103 #include "clientloop.h"
104 #include "sshconnect.h"
106 #include "atomicio.h"
109 #include "monitor_fdpass.h"
114 extern Options options;
116 /* Flag indicating that stdin should be redirected from /dev/null. */
117 extern int stdin_null_flag;
119 /* Flag indicating that no shell has been requested */
120 extern int no_shell_flag;
123 extern int control_fd;
126 * Name of the host we are connecting to. This is the name given on the
127 * command line, or the HostName specified for the user-supplied name in a
128 * configuration file.
133 * Flag to indicate that we have received a window change signal which has
134 * not yet been processed. This will cause a message indicating the new
135 * window size to be sent to the server a little later. This is volatile
136 * because this is updated in a signal handler.
138 static volatile sig_atomic_t received_window_change_signal = 0;
139 static volatile sig_atomic_t received_signal = 0;
141 /* Flag indicating whether the user's terminal is in non-blocking mode. */
142 static int in_non_blocking_mode = 0;
144 /* Common data for the client loop code. */
145 static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
146 static int escape_char; /* Escape character. */
147 static int escape_pending; /* Last character was the escape character */
148 static int last_was_cr; /* Last character was a newline. */
149 static int exit_status; /* Used to store the exit status of the command. */
150 static int stdin_eof; /* EOF has been encountered on standard error. */
151 static Buffer stdin_buffer; /* Buffer for stdin data. */
152 static Buffer stdout_buffer; /* Buffer for stdout data. */
153 static Buffer stderr_buffer; /* Buffer for stderr data. */
154 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
155 static u_int buffer_high;/* Soft max buffer size. */
156 static int connection_in; /* Connection to server (input). */
157 static int connection_out; /* Connection to server (output). */
158 static int need_rekeying; /* Set to non-zero if rekeying is requested. */
159 static int session_closed = 0; /* In SSH2: login session closed. */
160 static int server_alive_timeouts = 0;
162 static void client_init_dispatch(void);
163 int session_ident = -1;
179 void ssh_process_session2_setup(int, int, int, Buffer *);
181 /* Restores stdin to blocking mode. */
184 leave_non_blocking(void)
186 if (in_non_blocking_mode) {
187 unset_nonblock(fileno(stdin));
188 in_non_blocking_mode = 0;
192 /* Puts stdin terminal in non-blocking mode. */
195 enter_non_blocking(void)
197 in_non_blocking_mode = 1;
198 set_nonblock(fileno(stdin));
202 * Signal handler for the window change signal (SIGWINCH). This just sets a
203 * flag indicating that the window has changed.
207 window_change_handler(int sig)
209 received_window_change_signal = 1;
210 signal(SIGWINCH, window_change_handler);
214 * Signal handler for signals that cause the program to terminate. These
215 * signals must be trapped to restore terminal modes.
219 signal_handler(int sig)
221 received_signal = sig;
226 * Returns current time in seconds from Jan 1, 1970 with the maximum
227 * available resolution.
231 get_current_time(void)
234 gettimeofday(&tv, NULL);
235 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
238 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
240 client_x11_get_proto(const char *display, const char *xauth_path,
241 u_int trusted, char **_proto, char **_data)
246 static char proto[512], data[512];
248 int got_data = 0, generated = 0, do_unlink = 0, i;
249 char *xauthdir, *xauthfile;
252 xauthdir = xauthfile = NULL;
255 proto[0] = data[0] = '\0';
257 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
258 debug("No xauth program.");
260 if (display == NULL) {
261 debug("x11_get_proto: DISPLAY not set");
265 * Handle FamilyLocal case where $DISPLAY does
266 * not match an authorization entry. For this we
267 * just try "xauth list unix:displaynum.screennum".
268 * XXX: "localhost" match to determine FamilyLocal
271 if (strncmp(display, "localhost:", 10) == 0) {
272 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
277 xauthdir = xmalloc(MAXPATHLEN);
278 xauthfile = xmalloc(MAXPATHLEN);
279 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
280 if (mkdtemp(xauthdir) != NULL) {
282 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
284 snprintf(cmd, sizeof(cmd),
285 "%s -f %s generate %s " SSH_X11_PROTO
286 " untrusted timeout 1200 2>" _PATH_DEVNULL,
287 xauth_path, xauthfile, display);
288 debug2("x11_get_proto: %s", cmd);
289 if (system(cmd) == 0)
295 * When in untrusted mode, we read the cookie only if it was
296 * successfully generated as an untrusted one in the step
299 if (trusted || generated) {
300 snprintf(cmd, sizeof(cmd),
301 "%s %s%s list %s 2>" _PATH_DEVNULL,
303 generated ? "-f " : "" ,
304 generated ? xauthfile : "",
306 debug2("x11_get_proto: %s", cmd);
308 if (f && fgets(line, sizeof(line), f) &&
309 sscanf(line, "%*s %511s %511s", proto, data) == 2)
314 error("Warning: untrusted X11 forwarding setup failed: "
315 "xauth key data not generated");
328 * If we didn't get authentication data, just make up some
329 * data. The forwarding code will check the validity of the
330 * response anyway, and substitute this data. The X11
331 * server, however, will ignore this fake data and use
332 * whatever authentication mechanisms it was using otherwise
333 * for the local connection.
338 logit("Warning: No xauth data; "
339 "using fake authentication data for X11 forwarding.");
340 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
341 for (i = 0; i < 16; i++) {
344 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
352 * This is called when the interactive is entered. This checks if there is
353 * an EOF coming on stdin. We must check this explicitly, as select() does
354 * not appear to wake up when redirecting from /dev/null.
358 client_check_initial_eof_on_stdin(void)
364 * If standard input is to be "redirected from /dev/null", we simply
365 * mark that we have seen an EOF and send an EOF message to the
366 * server. Otherwise, we try to read a single character; it appears
367 * that for some files, such /dev/null, select() never wakes up for
368 * read for this descriptor, which means that we never get EOF. This
369 * way we will get the EOF if stdin comes from /dev/null or similar.
371 if (stdin_null_flag) {
372 /* Fake EOF on stdin. */
373 debug("Sending eof.");
375 packet_start(SSH_CMSG_EOF);
378 enter_non_blocking();
380 /* Check for immediate EOF on stdin. */
381 len = read(fileno(stdin), buf, 1);
383 /* EOF. Record that we have seen it and send EOF to server. */
384 debug("Sending eof.");
386 packet_start(SSH_CMSG_EOF);
388 } else if (len > 0) {
390 * Got data. We must store the data in the buffer,
391 * and also process it as an escape character if
394 if ((u_char) buf[0] == escape_char)
397 buffer_append(&stdin_buffer, buf, 1);
399 leave_non_blocking();
405 * Make packets from buffered stdin data, and buffer them for sending to the
410 client_make_packets_from_stdin_data(void)
414 /* Send buffered stdin data to the server. */
415 while (buffer_len(&stdin_buffer) > 0 &&
416 packet_not_very_much_data_to_write()) {
417 len = buffer_len(&stdin_buffer);
418 /* Keep the packets at reasonable size. */
419 if (len > packet_get_maxsize())
420 len = packet_get_maxsize();
421 packet_start(SSH_CMSG_STDIN_DATA);
422 packet_put_string(buffer_ptr(&stdin_buffer), len);
424 buffer_consume(&stdin_buffer, len);
426 /* If we have a pending EOF, send it now. */
427 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
428 packet_start(SSH_CMSG_EOF);
435 * Checks if the client window has changed, and sends a packet about it to
436 * the server if so. The actual change is detected elsewhere (by a software
437 * interrupt on Unix); this just checks the flag and sends a message if
442 client_check_window_change(void)
446 if (! received_window_change_signal)
449 received_window_change_signal = 0;
451 debug2("client_check_window_change: changed");
454 channel_send_window_changes();
456 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
458 packet_start(SSH_CMSG_WINDOW_SIZE);
459 packet_put_int((u_int)ws.ws_row);
460 packet_put_int((u_int)ws.ws_col);
461 packet_put_int((u_int)ws.ws_xpixel);
462 packet_put_int((u_int)ws.ws_ypixel);
468 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
470 server_alive_timeouts = 0;
471 client_global_request_reply_fwd(type, seq, ctxt);
475 server_alive_check(void)
477 if (++server_alive_timeouts > options.server_alive_count_max) {
478 logit("Timeout, server not responding.");
481 packet_start(SSH2_MSG_GLOBAL_REQUEST);
482 packet_put_cstring("keepalive@openssh.com");
483 packet_put_char(1); /* boolean: want reply */
488 * Waits until the client can do something (some data becomes available on
489 * one of the file descriptors).
492 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
493 int *maxfdp, u_int *nallocp, int rekeying)
495 struct timeval tv, *tvp;
498 /* Add any selections by the channel mechanism. */
499 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
502 /* Read from the connection, unless our buffers are full. */
503 if (buffer_len(&stdout_buffer) < buffer_high &&
504 buffer_len(&stderr_buffer) < buffer_high &&
505 channel_not_very_much_buffered_data())
506 FD_SET(connection_in, *readsetp);
508 * Read from stdin, unless we have seen EOF or have very much
509 * buffered data to send to the server.
511 if (!stdin_eof && packet_not_very_much_data_to_write())
512 FD_SET(fileno(stdin), *readsetp);
514 /* Select stdout/stderr if have data in buffer. */
515 if (buffer_len(&stdout_buffer) > 0)
516 FD_SET(fileno(stdout), *writesetp);
517 if (buffer_len(&stderr_buffer) > 0)
518 FD_SET(fileno(stderr), *writesetp);
520 /* channel_prepare_select could have closed the last channel */
521 if (session_closed && !channel_still_open() &&
522 !packet_have_data_to_write()) {
523 /* clear mask since we did not call select() */
524 memset(*readsetp, 0, *nallocp);
525 memset(*writesetp, 0, *nallocp);
528 FD_SET(connection_in, *readsetp);
532 /* Select server connection if have data to write to the server. */
533 if (packet_have_data_to_write())
534 FD_SET(connection_out, *writesetp);
536 if (control_fd != -1)
537 FD_SET(control_fd, *readsetp);
540 * Wait for something to happen. This will suspend the process until
541 * some selected descriptor can be read, written, or has some other
545 if (options.server_alive_interval == 0 || !compat20)
548 tv.tv_sec = options.server_alive_interval;
552 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
557 * We have to clear the select masks, because we return.
558 * We have to return, because the mainloop checks for the flags
559 * set by the signal handlers.
561 memset(*readsetp, 0, *nallocp);
562 memset(*writesetp, 0, *nallocp);
566 /* Note: we might still have data in the buffers. */
567 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
568 buffer_append(&stderr_buffer, buf, strlen(buf));
571 server_alive_check();
575 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
577 /* Flush stdout and stderr buffers. */
578 if (buffer_len(bout) > 0)
579 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
580 if (buffer_len(berr) > 0)
581 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
586 * Free (and clear) the buffer to reduce the amount of data that gets
593 /* Send the suspend signal to the program itself. */
594 kill(getpid(), SIGTSTP);
596 /* Reset window sizes in case they have changed */
597 received_window_change_signal = 1;
599 /* OK, we have been continued by the user. Reinitialize buffers. */
608 client_process_net_input(fd_set *readset)
614 * Read input from the server, and add any such data to the buffer of
615 * the packet subsystem.
617 if (FD_ISSET(connection_in, readset)) {
618 /* Read as much as possible. */
619 len = read(connection_in, buf, sizeof(buf));
621 /* Received EOF. The remote host has closed the connection. */
622 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
624 buffer_append(&stderr_buffer, buf, strlen(buf));
629 * There is a kernel bug on Solaris that causes select to
630 * sometimes wake up even though there is no data available.
632 if (len < 0 && (errno == EAGAIN || errno == EINTR))
636 /* An error has encountered. Perhaps there is a network problem. */
637 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
638 host, strerror(errno));
639 buffer_append(&stderr_buffer, buf, strlen(buf));
643 packet_process_incoming(buf, len);
648 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
653 id = packet_get_int();
656 if ((c = channel_lookup(id)) == NULL) {
657 error("%s: no channel for id %d", __func__, id);
661 if (type == SSH2_MSG_CHANNEL_SUCCESS)
662 debug2("Request suceeded on channel %d", id);
663 else if (type == SSH2_MSG_CHANNEL_FAILURE) {
664 error("Request failed on channel %d", id);
670 client_extra_session2_setup(int id, void *arg)
672 struct confirm_ctx *cctx = arg;
678 fatal("%s: cctx == NULL", __func__);
679 if ((c = channel_lookup(id)) == NULL)
680 fatal("%s: no channel for id %d", __func__, id);
682 display = getenv("DISPLAY");
683 if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
685 /* Get reasonable local authentication information. */
686 client_x11_get_proto(display, options.xauth_location,
687 options.forward_x11_trusted, &proto, &data);
688 /* Request forwarding with authentication spoofing. */
689 debug("Requesting X11 forwarding with authentication spoofing.");
690 x11_request_forwarding_with_spoofing(id, display, proto, data);
691 /* XXX wait for reply */
694 if (cctx->want_agent_fwd && options.forward_agent) {
695 debug("Requesting authentication agent forwarding.");
696 channel_request_start(id, "auth-agent-req@openssh.com", 0);
700 client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
701 cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
702 client_subsystem_reply);
704 c->confirm_ctx = NULL;
705 buffer_free(&cctx->cmd);
707 if (cctx->env != NULL) {
708 for (i = 0; cctx->env[i] != NULL; i++)
716 client_process_control(fd_set *readset)
720 int client_fd, new_fd[3], ver, allowed, window, packetmax;
722 struct sockaddr_storage addr;
723 struct confirm_ctx *cctx;
725 u_int i, len, env_len, command, flags;
730 * Accept connection on control socket
732 if (control_fd == -1 || !FD_ISSET(control_fd, readset))
735 memset(&addr, 0, sizeof(addr));
736 addrlen = sizeof(addr);
737 if ((client_fd = accept(control_fd,
738 (struct sockaddr*)&addr, &addrlen)) == -1) {
739 error("%s accept: %s", __func__, strerror(errno));
743 if (getpeereid(client_fd, &euid, &egid) < 0) {
744 error("%s getpeereid failed: %s", __func__, strerror(errno));
748 if ((euid != 0) && (getuid() != euid)) {
749 error("control mode uid mismatch: peer euid %u != uid %u",
750 (u_int) euid, (u_int) getuid());
755 unset_nonblock(client_fd);
759 if (ssh_msg_recv(client_fd, &m) == -1) {
760 error("%s: client msg_recv failed", __func__);
765 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
766 error("%s: wrong client version %d", __func__, ver);
773 command = buffer_get_int(&m);
774 flags = buffer_get_int(&m);
779 case SSHMUX_COMMAND_OPEN:
780 if (options.control_master == SSHCTL_MASTER_ASK ||
781 options.control_master == SSHCTL_MASTER_AUTO_ASK)
782 allowed = ask_permission("Allow shared connection "
786 case SSHMUX_COMMAND_TERMINATE:
787 if (options.control_master == SSHCTL_MASTER_ASK ||
788 options.control_master == SSHCTL_MASTER_AUTO_ASK)
789 allowed = ask_permission("Terminate shared connection "
794 case SSHMUX_COMMAND_ALIVE_CHECK:
795 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
797 buffer_put_int(&m, allowed);
798 buffer_put_int(&m, getpid());
799 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
800 error("%s: client msg_send failed", __func__);
809 error("Unsupported command %d", command);
815 /* Reply for SSHMUX_COMMAND_OPEN */
817 buffer_put_int(&m, allowed);
818 buffer_put_int(&m, getpid());
819 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
820 error("%s: client msg_send failed", __func__);
827 error("Refused control connection");
834 if (ssh_msg_recv(client_fd, &m) == -1) {
835 error("%s: client msg_recv failed", __func__);
840 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
841 error("%s: wrong client version %d", __func__, ver);
847 cctx = xcalloc(1, sizeof(*cctx));
848 cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
849 cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
850 cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
851 cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
852 cctx->term = buffer_get_string(&m, &len);
854 cmd = buffer_get_string(&m, &len);
855 buffer_init(&cctx->cmd);
856 buffer_append(&cctx->cmd, cmd, strlen(cmd));
858 env_len = buffer_get_int(&m);
859 env_len = MIN(env_len, 4096);
860 debug3("%s: receiving %d env vars", __func__, env_len);
862 cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
863 for (i = 0; i < env_len; i++)
864 cctx->env[i] = buffer_get_string(&m, &len);
868 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
869 cctx->want_tty, cctx->want_subsys, cmd);
872 /* Gather fds from client */
873 new_fd[0] = mm_receive_fd(client_fd);
874 new_fd[1] = mm_receive_fd(client_fd);
875 new_fd[2] = mm_receive_fd(client_fd);
877 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
878 new_fd[0], new_fd[1], new_fd[2]);
880 /* Try to pick up ttymodes from client before it goes raw */
881 if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
882 error("%s: tcgetattr: %s", __func__, strerror(errno));
884 /* This roundtrip is just for synchronisation of ttymodes */
886 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
887 error("%s: client msg_send failed", __func__);
895 for (i = 0; i < env_len; i++)
903 /* enable nonblocking unless tty */
904 if (!isatty(new_fd[0]))
905 set_nonblock(new_fd[0]);
906 if (!isatty(new_fd[1]))
907 set_nonblock(new_fd[1]);
908 if (!isatty(new_fd[2]))
909 set_nonblock(new_fd[2]);
911 set_nonblock(client_fd);
913 if (options.hpn_disabled)
914 window = CHAN_SES_WINDOW_DEFAULT;
916 window = options.hpn_buffer_size;
918 packetmax = CHAN_SES_PACKET_DEFAULT;
919 if (cctx->want_tty) {
924 c = channel_new("session", SSH_CHANNEL_OPENING,
925 new_fd[0], new_fd[1], new_fd[2], window, packetmax,
926 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
929 c->ctl_fd = client_fd;
931 debug3("%s: channel_new: %d", __func__, c->self);
933 channel_send_open(c->self);
934 channel_register_confirm(c->self, client_extra_session2_setup, cctx);
938 process_cmdline(void)
940 void (*handler)(int);
941 char *s, *cmd, *cancel_host;
948 handler = signal(SIGINT, SIG_IGN);
949 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
955 s++; /* Skip cmdline '-', if any */
959 if (*s == 'h' || *s == 'H' || *s == '?') {
961 logit(" -L[bind_address:]port:host:hostport "
962 "Request local forward");
963 logit(" -R[bind_address:]port:host:hostport "
964 "Request remote forward");
965 logit(" -KR[bind_address:]port "
966 "Cancel remote forward");
967 if (!options.permit_local_command)
970 "Execute local command");
974 if (*s == '!' && options.permit_local_command) {
984 if (*s != 'L' && *s != 'R') {
985 logit("Invalid command.");
990 if (local && delete) {
991 logit("Not supported.");
994 if ((!local || delete) && !compat20) {
995 logit("Not supported for SSH protocol version 1.");
999 while (isspace(*++s))
1004 cancel_host = hpdelim(&s); /* may be NULL */
1006 cancel_port = a2port(s);
1007 cancel_host = cleanhostname(cancel_host);
1009 cancel_port = a2port(cancel_host);
1012 if (cancel_port == 0) {
1013 logit("Bad forwarding close port");
1016 channel_request_rforward_cancel(cancel_host, cancel_port);
1018 if (!parse_forward(&fwd, s)) {
1019 logit("Bad forwarding specification.");
1023 if (channel_setup_local_fwd_listener(fwd.listen_host,
1024 fwd.listen_port, fwd.connect_host,
1025 fwd.connect_port, options.gateway_ports,
1026 options.hpn_disabled, options.hpn_buffer_size) < 0) {
1027 logit("Port forwarding failed.");
1031 if (channel_request_remote_forwarding(fwd.listen_host,
1032 fwd.listen_port, fwd.connect_host,
1033 fwd.connect_port) < 0) {
1034 logit("Port forwarding failed.");
1039 logit("Forwarding port.");
1043 signal(SIGINT, handler);
1049 /* process the characters one by one */
1051 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1063 for (i = 0; i < (u_int)len; i++) {
1064 /* Get one character at a time. */
1067 if (escape_pending) {
1068 /* We have previously seen an escape character. */
1069 /* Clear the flag now. */
1072 /* Process the escaped character. */
1075 /* Terminate the connection. */
1076 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1077 buffer_append(berr, string, strlen(string));
1083 /* Suspend the program. */
1084 /* Print a message to that effect to the user. */
1085 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1086 buffer_append(berr, string, strlen(string));
1088 /* Restore terminal modes and suspend. */
1089 client_suspend_self(bin, bout, berr);
1091 /* We have been continued. */
1096 snprintf(string, sizeof string,
1097 "%cB\r\n", escape_char);
1098 buffer_append(berr, string,
1100 channel_request_start(session_ident,
1102 packet_put_int(1000);
1109 if (datafellows & SSH_BUG_NOREKEY)
1110 logit("Server does not support re-keying");
1118 * Detach the program (continue to serve connections,
1119 * but put in background and no more new connections).
1121 /* Restore tty modes. */
1124 /* Stop listening for new connections. */
1125 channel_stop_listening();
1127 snprintf(string, sizeof string,
1128 "%c& [backgrounded]\n", escape_char);
1129 buffer_append(berr, string, strlen(string));
1131 /* Fork into background. */
1134 error("fork: %.100s", strerror(errno));
1137 if (pid != 0) { /* This is the parent. */
1138 /* The parent just exits. */
1141 /* The child continues serving connections. */
1143 buffer_append(bin, "\004", 1);
1144 /* fake EOF on stdin */
1146 } else if (!stdin_eof) {
1148 * Sending SSH_CMSG_EOF alone does not always appear
1149 * to be enough. So we try to send an EOF character
1152 packet_start(SSH_CMSG_STDIN_DATA);
1153 packet_put_string("\004", 1);
1157 if (buffer_len(bin) == 0) {
1158 packet_start(SSH_CMSG_EOF);
1165 snprintf(string, sizeof string,
1167 Supported escape sequences:\r\n\
1168 %c. - terminate connection\r\n\
1169 %cB - send a BREAK to the remote system\r\n\
1170 %cC - open a command line\r\n\
1171 %cR - Request rekey (SSH protocol 2 only)\r\n\
1172 %c^Z - suspend ssh\r\n\
1173 %c# - list forwarded connections\r\n\
1174 %c& - background ssh (when waiting for connections to terminate)\r\n\
1175 %c? - this message\r\n\
1176 %c%c - send the escape character by typing it twice\r\n\
1177 (Note that escapes are only recognized immediately after newline.)\r\n",
1178 escape_char, escape_char, escape_char, escape_char,
1179 escape_char, escape_char, escape_char, escape_char,
1180 escape_char, escape_char, escape_char);
1181 buffer_append(berr, string, strlen(string));
1185 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1186 buffer_append(berr, string, strlen(string));
1187 s = channel_open_message();
1188 buffer_append(berr, s, strlen(s));
1197 if (ch != escape_char) {
1198 buffer_put_char(bin, escape_char);
1201 /* Escaped characters fall through here */
1206 * The previous character was not an escape char. Check if this
1209 if (last_was_cr && ch == escape_char) {
1210 /* It is. Set the flag and continue to next character. */
1217 * Normal character. Record whether it was a newline,
1218 * and append it to the buffer.
1220 last_was_cr = (ch == '\r' || ch == '\n');
1221 buffer_put_char(bin, ch);
1228 client_process_input(fd_set *readset)
1233 /* Read input from stdin. */
1234 if (FD_ISSET(fileno(stdin), readset)) {
1235 /* Read as much as possible. */
1236 len = read(fileno(stdin), buf, sizeof(buf));
1237 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1238 return; /* we'll try again later */
1241 * Received EOF or error. They are treated
1242 * similarly, except that an error message is printed
1243 * if it was an error condition.
1246 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1247 buffer_append(&stderr_buffer, buf, strlen(buf));
1249 /* Mark that we have seen EOF. */
1252 * Send an EOF message to the server unless there is
1253 * data in the buffer. If there is data in the
1254 * buffer, no message will be sent now. Code
1255 * elsewhere will send the EOF when the buffer
1256 * becomes empty if stdin_eof is set.
1258 if (buffer_len(&stdin_buffer) == 0) {
1259 packet_start(SSH_CMSG_EOF);
1262 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1264 * Normal successful read, and no escape character.
1265 * Just append the data to buffer.
1267 buffer_append(&stdin_buffer, buf, len);
1270 * Normal, successful read. But we have an escape character
1271 * and have to process the characters one by one.
1273 if (process_escapes(&stdin_buffer, &stdout_buffer,
1274 &stderr_buffer, buf, len) == -1)
1281 client_process_output(fd_set *writeset)
1286 /* Write buffered output to stdout. */
1287 if (FD_ISSET(fileno(stdout), writeset)) {
1288 /* Write as much data as possible. */
1289 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1290 buffer_len(&stdout_buffer));
1292 if (errno == EINTR || errno == EAGAIN)
1296 * An error or EOF was encountered. Put an
1297 * error message to stderr buffer.
1299 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1300 buffer_append(&stderr_buffer, buf, strlen(buf));
1305 /* Consume printed data from the buffer. */
1306 buffer_consume(&stdout_buffer, len);
1307 stdout_bytes += len;
1309 /* Write buffered output to stderr. */
1310 if (FD_ISSET(fileno(stderr), writeset)) {
1311 /* Write as much data as possible. */
1312 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1313 buffer_len(&stderr_buffer));
1315 if (errno == EINTR || errno == EAGAIN)
1318 /* EOF or error, but can't even print error message. */
1323 /* Consume printed characters from the buffer. */
1324 buffer_consume(&stderr_buffer, len);
1325 stderr_bytes += len;
1330 * Get packets from the connection input buffer, and process them as long as
1331 * there are packets available.
1333 * Any unknown packets received during the actual
1334 * session cause the session to terminate. This is
1335 * intended to make debugging easier since no
1336 * confirmations are sent. Any compatible protocol
1337 * extensions must be negotiated during the
1338 * preparatory phase.
1342 client_process_buffered_input_packets(void)
1344 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1347 /* scan buf[] for '~' before sending data to the peer */
1350 simple_escape_filter(Channel *c, char *buf, int len)
1352 /* XXX we assume c->extended is writeable */
1353 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1357 client_channel_closed(int id, void *arg)
1359 channel_cancel_cleanup(id);
1365 * Implements the interactive session with the server. This is called after
1366 * the user has been authenticated, and a command has been started on the
1367 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1368 * used as an escape character for terminating or suspending the session.
1372 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1374 fd_set *readset = NULL, *writeset = NULL;
1375 double start_time, total_time;
1376 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1380 debug("Entering interactive session.");
1382 start_time = get_current_time();
1384 /* Initialize variables. */
1389 buffer_high = 64 * 1024;
1390 connection_in = packet_get_connection_in();
1391 connection_out = packet_get_connection_out();
1392 max_fd = MAX(connection_in, connection_out);
1393 if (control_fd != -1)
1394 max_fd = MAX(max_fd, control_fd);
1397 /* enable nonblocking unless tty */
1398 if (!isatty(fileno(stdin)))
1399 set_nonblock(fileno(stdin));
1400 if (!isatty(fileno(stdout)))
1401 set_nonblock(fileno(stdout));
1402 if (!isatty(fileno(stderr)))
1403 set_nonblock(fileno(stderr));
1404 max_fd = MAX(max_fd, fileno(stdin));
1405 max_fd = MAX(max_fd, fileno(stdout));
1406 max_fd = MAX(max_fd, fileno(stderr));
1412 escape_char = escape_char_arg;
1414 /* Initialize buffers. */
1415 buffer_init(&stdin_buffer);
1416 buffer_init(&stdout_buffer);
1417 buffer_init(&stderr_buffer);
1419 client_init_dispatch();
1422 * Set signal handlers, (e.g. to restore non-blocking mode)
1423 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1425 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1426 signal(SIGHUP, signal_handler);
1427 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1428 signal(SIGINT, signal_handler);
1429 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1430 signal(SIGQUIT, signal_handler);
1431 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1432 signal(SIGTERM, signal_handler);
1433 signal(SIGWINCH, window_change_handler);
1439 session_ident = ssh2_chan_id;
1440 if (escape_char != SSH_ESCAPECHAR_NONE)
1441 channel_register_filter(session_ident,
1442 simple_escape_filter, NULL);
1443 if (session_ident != -1)
1444 channel_register_cleanup(session_ident,
1445 client_channel_closed, 0);
1447 /* Check if we should immediately send eof on stdin. */
1448 client_check_initial_eof_on_stdin();
1451 /* Main loop of the client for the interactive session mode. */
1452 while (!quit_pending) {
1454 /* Process buffered packets sent by the server. */
1455 client_process_buffered_input_packets();
1457 if (compat20 && session_closed && !channel_still_open())
1460 rekeying = (xxx_kex != NULL && !xxx_kex->done);
1463 debug("rekeying in progress");
1466 * Make packets of buffered stdin data, and buffer
1467 * them for sending to the server.
1470 client_make_packets_from_stdin_data();
1473 * Make packets from buffered channel data, and
1474 * enqueue them for sending to the server.
1476 if (packet_not_very_much_data_to_write())
1477 channel_output_poll();
1480 * Check if the window size has changed, and buffer a
1481 * message about it to the server if so.
1483 client_check_window_change();
1489 * Wait until we have something to do (something becomes
1490 * available on one of the descriptors).
1493 client_wait_until_can_do_something(&readset, &writeset,
1494 &max_fd2, &nalloc, rekeying);
1499 /* Do channel operations unless rekeying in progress. */
1501 channel_after_select(readset, writeset);
1502 if (need_rekeying || packet_need_rekeying()) {
1503 debug("need rekeying");
1505 kex_send_kexinit(xxx_kex);
1510 /* Buffer input from the connection. */
1511 client_process_net_input(readset);
1513 /* Accept control connections. */
1514 client_process_control(readset);
1520 /* Buffer data from stdin */
1521 client_process_input(readset);
1523 * Process output to stdout and stderr. Output to
1524 * the connection is processed elsewhere (above).
1526 client_process_output(writeset);
1529 /* Send as much buffered packet data as possible to the sender. */
1530 if (FD_ISSET(connection_out, writeset))
1531 packet_write_poll();
1538 /* Terminate the session. */
1540 /* Stop watching for window change. */
1541 signal(SIGWINCH, SIG_DFL);
1548 /* restore blocking io */
1549 if (!isatty(fileno(stdin)))
1550 unset_nonblock(fileno(stdin));
1551 if (!isatty(fileno(stdout)))
1552 unset_nonblock(fileno(stdout));
1553 if (!isatty(fileno(stderr)))
1554 unset_nonblock(fileno(stderr));
1557 * If there was no shell or command requested, there will be no remote
1558 * exit status to be returned. In that case, clear error code if the
1559 * connection was deliberately terminated at this end.
1561 if (no_shell_flag && received_signal == SIGTERM) {
1562 received_signal = 0;
1566 if (received_signal)
1567 fatal("Killed by signal %d.", (int) received_signal);
1570 * In interactive mode (with pseudo tty) display a message indicating
1571 * that the connection has been closed.
1573 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1574 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1575 buffer_append(&stderr_buffer, buf, strlen(buf));
1578 /* Output any buffered data for stdout. */
1579 while (buffer_len(&stdout_buffer) > 0) {
1580 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1581 buffer_len(&stdout_buffer));
1583 error("Write failed flushing stdout buffer.");
1586 buffer_consume(&stdout_buffer, len);
1587 stdout_bytes += len;
1590 /* Output any buffered data for stderr. */
1591 while (buffer_len(&stderr_buffer) > 0) {
1592 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1593 buffer_len(&stderr_buffer));
1595 error("Write failed flushing stderr buffer.");
1598 buffer_consume(&stderr_buffer, len);
1599 stderr_bytes += len;
1602 /* Clear and free any buffers. */
1603 memset(buf, 0, sizeof(buf));
1604 buffer_free(&stdin_buffer);
1605 buffer_free(&stdout_buffer);
1606 buffer_free(&stderr_buffer);
1608 /* Report bytes transferred, and transfer rates. */
1609 total_time = get_current_time() - start_time;
1610 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1611 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1613 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1614 stdin_bytes / total_time, stdout_bytes / total_time,
1615 stderr_bytes / total_time);
1617 /* Return the exit status of the program. */
1618 debug("Exit status %d", exit_status);
1625 client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1628 char *data = packet_get_string(&data_len);
1630 buffer_append(&stdout_buffer, data, data_len);
1631 memset(data, 0, data_len);
1635 client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1638 char *data = packet_get_string(&data_len);
1640 buffer_append(&stderr_buffer, data, data_len);
1641 memset(data, 0, data_len);
1645 client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1647 exit_status = packet_get_int();
1649 /* Acknowledge the exit. */
1650 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1653 * Must wait for packet to be sent since we are
1656 packet_write_wait();
1657 /* Flag that we want to exit. */
1661 client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1664 int remote_id, sock;
1666 /* Read the remote channel number from the message. */
1667 remote_id = packet_get_int();
1671 * Get a connection to the local authentication agent (this may again
1674 sock = ssh_get_authentication_socket();
1677 * If we could not connect the agent, send an error message back to
1678 * the server. This should never happen unless the agent dies,
1679 * because authentication forwarding is only enabled if we have an
1683 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1684 -1, 0, 0, 0, "authentication agent connection", 1);
1685 c->remote_id = remote_id;
1689 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1690 packet_put_int(remote_id);
1692 /* Send a confirmation to the remote host. */
1693 debug("Forwarding authentication connection.");
1694 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1695 packet_put_int(remote_id);
1696 packet_put_int(c->self);
1702 client_request_forwarded_tcpip(const char *request_type, int rchan)
1705 char *listen_address, *originator_address;
1706 int listen_port, originator_port;
1709 /* Get rest of the packet */
1710 listen_address = packet_get_string(NULL);
1711 listen_port = packet_get_int();
1712 originator_address = packet_get_string(NULL);
1713 originator_port = packet_get_int();
1716 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1717 listen_address, listen_port, originator_address, originator_port);
1719 sock = channel_connect_by_listen_address(listen_port);
1721 xfree(originator_address);
1722 xfree(listen_address);
1725 if (options.hpn_disabled)
1726 c = channel_new("forwarded-tcpip",
1727 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1728 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1729 originator_address, 1);
1731 c = channel_new("forwarded-tcpip",
1732 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1733 options.hpn_buffer_size, options.hpn_buffer_size, 0,
1734 originator_address, 1);
1735 xfree(originator_address);
1736 xfree(listen_address);
1741 client_request_x11(const char *request_type, int rchan)
1745 int originator_port;
1748 if (!options.forward_x11) {
1749 error("Warning: ssh server tried X11 forwarding.");
1750 error("Warning: this is probably a break-in attempt by a malicious server.");
1753 originator = packet_get_string(NULL);
1754 if (datafellows & SSH_BUG_X11FWD) {
1755 debug2("buggy server: x11 request w/o originator_port");
1756 originator_port = 0;
1758 originator_port = packet_get_int();
1761 /* XXX check permission */
1762 debug("client_request_x11: request from %s %d", originator,
1765 sock = x11_connect_display();
1768 /* again is this really necessary for X11? */
1769 if (options.hpn_disabled)
1770 c = channel_new("x11",
1771 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1772 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1774 c = channel_new("x11",
1775 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1776 options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1782 client_request_agent(const char *request_type, int rchan)
1787 if (!options.forward_agent) {
1788 error("Warning: ssh server tried agent forwarding.");
1789 error("Warning: this is probably a break-in attempt by a malicious server.");
1792 sock = ssh_get_authentication_socket();
1795 /* not sure this is really needed here either */
1796 if (options.hpn_disabled)
1797 c = channel_new("authentication agent connection",
1798 SSH_CHANNEL_OPEN, sock, sock, -1,
1799 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1800 "authentication agent connection", 1);
1802 c = channel_new("authentication agent connection",
1803 SSH_CHANNEL_OPEN, sock, sock, -1,
1804 options.hpn_buffer_size, options.hpn_buffer_size, 0,
1805 "authentication agent connection", 1);
1811 client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1816 if (tun_mode == SSH_TUNMODE_NO)
1820 error("Tunnel forwarding is not support for protocol 1");
1824 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1826 /* Open local tunnel device */
1827 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1828 error("Tunnel device open failed.");
1832 if(options.hpn_disabled)
1833 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1834 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1837 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1838 options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
1842 #if defined(SSH_TUN_FILTER)
1843 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1844 channel_register_filter(c->self, sys_tun_infilter,
1848 packet_start(SSH2_MSG_CHANNEL_OPEN);
1849 packet_put_cstring("tun@openssh.com");
1850 packet_put_int(c->self);
1851 packet_put_int(c->local_window_max);
1852 packet_put_int(c->local_maxpacket);
1853 packet_put_int(tun_mode);
1854 packet_put_int(remote_tun);
1860 /* XXXX move to generic input handler */
1862 client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1867 u_int rmaxpack, rwindow, len;
1869 ctype = packet_get_string(&len);
1870 rchan = packet_get_int();
1871 rwindow = packet_get_int();
1872 rmaxpack = packet_get_int();
1874 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1875 ctype, rchan, rwindow, rmaxpack);
1877 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1878 c = client_request_forwarded_tcpip(ctype, rchan);
1879 } else if (strcmp(ctype, "x11") == 0) {
1880 c = client_request_x11(ctype, rchan);
1881 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1882 c = client_request_agent(ctype, rchan);
1884 /* XXX duplicate : */
1886 debug("confirm %s", ctype);
1887 c->remote_id = rchan;
1888 c->remote_window = rwindow;
1889 c->remote_maxpacket = rmaxpack;
1890 if (c->type != SSH_CHANNEL_CONNECTING) {
1891 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1892 packet_put_int(c->remote_id);
1893 packet_put_int(c->self);
1894 packet_put_int(c->local_window);
1895 packet_put_int(c->local_maxpacket);
1899 debug("failure %s", ctype);
1900 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1901 packet_put_int(rchan);
1902 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1903 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1904 packet_put_cstring("open failed");
1905 packet_put_cstring("");
1912 client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1915 int exitval, id, reply, success = 0;
1918 id = packet_get_int();
1919 rtype = packet_get_string(NULL);
1920 reply = packet_get_char();
1922 debug("client_input_channel_req: channel %d rtype %s reply %d",
1926 error("client_input_channel_req: request for channel -1");
1927 } else if ((c = channel_lookup(id)) == NULL) {
1928 error("client_input_channel_req: channel %d: unknown channel", id);
1929 } else if (strcmp(rtype, "exit-status") == 0) {
1930 exitval = packet_get_int();
1931 if (id == session_ident) {
1933 exit_status = exitval;
1934 } else if (c->ctl_fd == -1) {
1935 error("client_input_channel_req: unexpected channel %d",
1938 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1944 packet_start(success ?
1945 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1952 client_input_global_request(int type, u_int32_t seq, void *ctxt)
1958 rtype = packet_get_string(NULL);
1959 want_reply = packet_get_char();
1960 debug("client_input_global_request: rtype %s want_reply %d",
1963 packet_start(success ?
1964 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1966 packet_write_wait();
1972 client_session2_setup(int id, int want_tty, int want_subsystem,
1973 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1974 dispatch_fn *subsys_repl)
1979 debug2("%s: id %d", __func__, id);
1981 if ((c = channel_lookup(id)) == NULL)
1982 fatal("client_session2_setup: channel %d: unknown channel", id);
1988 /* Store window size in the packet. */
1989 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1990 memset(&ws, 0, sizeof(ws));
1992 channel_request_start(id, "pty-req", 0);
1993 packet_put_cstring(term != NULL ? term : "");
1994 packet_put_int((u_int)ws.ws_col);
1995 packet_put_int((u_int)ws.ws_row);
1996 packet_put_int((u_int)ws.ws_xpixel);
1997 packet_put_int((u_int)ws.ws_ypixel);
1998 tio = get_saved_tio();
1999 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
2001 /* XXX wait for reply */
2005 /* Transfer any environment variables from client to server */
2006 if (options.num_send_env != 0 && env != NULL) {
2010 debug("Sending environment.");
2011 for (i = 0; env[i] != NULL; i++) {
2013 name = xstrdup(env[i]);
2014 if ((val = strchr(name, '=')) == NULL) {
2021 for (j = 0; j < options.num_send_env; j++) {
2022 if (match_pattern(name, options.send_env[j])) {
2028 debug3("Ignored env %s", name);
2033 debug("Sending env %s = %s", name, val);
2034 channel_request_start(id, "env", 0);
2035 packet_put_cstring(name);
2036 packet_put_cstring(val);
2042 len = buffer_len(cmd);
2046 if (want_subsystem) {
2047 debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
2048 channel_request_start(id, "subsystem", subsys_repl != NULL);
2049 if (subsys_repl != NULL) {
2050 /* register callback for reply */
2051 /* XXX we assume that client_loop has already been called */
2052 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
2053 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
2056 debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
2057 channel_request_start(id, "exec", 0);
2059 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2062 channel_request_start(id, "shell", 0);
2068 client_init_dispatch_20(void)
2070 dispatch_init(&dispatch_protocol_error);
2072 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2073 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2074 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2075 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2076 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2077 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2078 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2079 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2080 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2081 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
2084 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
2086 /* global request reply messages */
2087 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2088 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
2091 client_init_dispatch_13(void)
2093 dispatch_init(NULL);
2094 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2095 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2096 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2097 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2098 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2099 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2100 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2101 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2102 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
2104 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
2105 &client_input_agent_open : &deny_input_open);
2106 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2107 &x11_input_open : &deny_input_open);
2110 client_init_dispatch_15(void)
2112 client_init_dispatch_13();
2113 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2114 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2117 client_init_dispatch(void)
2120 client_init_dispatch_20();
2122 client_init_dispatch_13();
2124 client_init_dispatch_15();
2127 /* client specific fatal cleanup */
2132 leave_non_blocking();
2133 if (options.control_path != NULL && control_fd != -1)
2134 unlink(options.control_path);