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 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 1.39 2000/10/27 07:48:22 markus Exp $");
80 extern Options options;
82 /* Flag indicating that stdin should be redirected from /dev/null. */
83 extern int stdin_null_flag;
86 * Name of the host we are connecting to. This is the name given on the
87 * command line, or the HostName specified for the user-supplied name in a
93 * Flag to indicate that we have received a window change signal which has
94 * not yet been processed. This will cause a message indicating the new
95 * window size to be sent to the server a little later. This is volatile
96 * because this is updated in a signal handler.
98 static volatile int received_window_change_signal = 0;
100 /* Terminal modes, as saved by enter_raw_mode. */
101 static struct termios saved_tio;
104 * Flag indicating whether we are in raw mode. This is used by
105 * enter_raw_mode and leave_raw_mode.
107 static int in_raw_mode = 0;
109 /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
110 static int in_non_blocking_mode = 0;
112 /* Common data for the client loop code. */
113 static int quit_pending; /* Set to non-zero to quit the client loop. */
114 static int escape_char; /* Escape character. */
115 static int escape_pending; /* Last character was the escape character */
116 static int last_was_cr; /* Last character was a newline. */
117 static int exit_status; /* Used to store the exit status of the command. */
118 static int stdin_eof; /* EOF has been encountered on standard error. */
119 static Buffer stdin_buffer; /* Buffer for stdin data. */
120 static Buffer stdout_buffer; /* Buffer for stdout data. */
121 static Buffer stderr_buffer; /* Buffer for stderr data. */
122 static unsigned long stdin_bytes, stdout_bytes, stderr_bytes;
123 static unsigned int buffer_high;/* Soft max buffer size. */
124 static int max_fd; /* Maximum file descriptor number in select(). */
125 static int connection_in; /* Connection to server (input). */
126 static int connection_out; /* Connection to server (output). */
129 void client_init_dispatch(void);
130 int session_ident = -1;
132 /* Returns the user\'s terminal to normal mode if it had been put in raw mode. */
140 if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0)
143 fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL);
146 /* Puts the user\'s terminal in raw mode. */
153 if (tcgetattr(fileno(stdin), &tio) < 0)
156 tio.c_iflag |= IGNPAR;
157 tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
158 tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
160 tio.c_lflag &= ~IEXTEN;
162 tio.c_oflag &= ~OPOST;
165 if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0)
169 fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL);
172 /* Restores stdin to blocking mode. */
177 if (in_non_blocking_mode) {
178 (void) fcntl(fileno(stdin), F_SETFL, 0);
179 in_non_blocking_mode = 0;
180 fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL);
184 /* Puts stdin terminal in non-blocking mode. */
189 in_non_blocking_mode = 1;
190 (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
191 fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL);
195 * Signal handler for the window change signal (SIGWINCH). This just sets a
196 * flag indicating that the window has changed.
200 window_change_handler(int sig)
202 received_window_change_signal = 1;
203 signal(SIGWINCH, window_change_handler);
207 * Signal handler for signals that cause the program to terminate. These
208 * signals must be trapped to restore terminal modes.
212 signal_handler(int sig)
216 if (in_non_blocking_mode)
217 leave_non_blocking();
218 channel_stop_listening();
220 fatal("Killed by signal %d.", sig);
224 * Returns current time in seconds from Jan 1, 1970 with the maximum
225 * available resolution.
232 gettimeofday(&tv, NULL);
233 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
237 * This is called when the interactive is entered. This checks if there is
238 * an EOF coming on stdin. We must check this explicitly, as select() does
239 * not appear to wake up when redirecting from /dev/null.
243 client_check_initial_eof_on_stdin()
249 * If standard input is to be "redirected from /dev/null", we simply
250 * mark that we have seen an EOF and send an EOF message to the
251 * server. Otherwise, we try to read a single character; it appears
252 * that for some files, such /dev/null, select() never wakes up for
253 * read for this descriptor, which means that we never get EOF. This
254 * way we will get the EOF if stdin comes from /dev/null or similar.
256 if (stdin_null_flag) {
257 /* Fake EOF on stdin. */
258 debug("Sending eof.");
260 packet_start(SSH_CMSG_EOF);
263 enter_non_blocking();
265 /* Check for immediate EOF on stdin. */
266 len = read(fileno(stdin), buf, 1);
268 /* EOF. Record that we have seen it and send EOF to server. */
269 debug("Sending eof.");
271 packet_start(SSH_CMSG_EOF);
273 } else if (len > 0) {
275 * Got data. We must store the data in the buffer,
276 * and also process it as an escape character if
279 if ((unsigned char) buf[0] == escape_char)
282 buffer_append(&stdin_buffer, buf, 1);
286 leave_non_blocking();
292 * Make packets from buffered stdin data, and buffer them for sending to the
297 client_make_packets_from_stdin_data()
301 /* Send buffered stdin data to the server. */
302 while (buffer_len(&stdin_buffer) > 0 &&
303 packet_not_very_much_data_to_write()) {
304 len = buffer_len(&stdin_buffer);
305 /* Keep the packets at reasonable size. */
306 if (len > packet_get_maxsize())
307 len = packet_get_maxsize();
308 packet_start(SSH_CMSG_STDIN_DATA);
309 packet_put_string(buffer_ptr(&stdin_buffer), len);
311 buffer_consume(&stdin_buffer, len);
312 /* If we have a pending EOF, send it now. */
313 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
314 packet_start(SSH_CMSG_EOF);
321 * Checks if the client window has changed, and sends a packet about it to
322 * the server if so. The actual change is detected elsewhere (by a software
323 * interrupt on Unix); this just checks the flag and sends a message if
328 client_check_window_change()
332 if (! received_window_change_signal)
335 received_window_change_signal = 0;
337 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
340 debug2("client_check_window_change: changed");
343 channel_request_start(session_ident, "window-change", 0);
344 packet_put_int(ws.ws_col);
345 packet_put_int(ws.ws_row);
346 packet_put_int(ws.ws_xpixel);
347 packet_put_int(ws.ws_ypixel);
350 packet_start(SSH_CMSG_WINDOW_SIZE);
351 packet_put_int(ws.ws_row);
352 packet_put_int(ws.ws_col);
353 packet_put_int(ws.ws_xpixel);
354 packet_put_int(ws.ws_ypixel);
360 * Waits until the client can do something (some data becomes available on
361 * one of the file descriptors).
365 client_wait_until_can_do_something(fd_set * readset, fd_set * writeset)
367 /* Initialize select masks. */
372 /* Read from the connection, unless our buffers are full. */
373 if (buffer_len(&stdout_buffer) < buffer_high &&
374 buffer_len(&stderr_buffer) < buffer_high &&
375 channel_not_very_much_buffered_data())
376 FD_SET(connection_in, readset);
378 * Read from stdin, unless we have seen EOF or have very much
379 * buffered data to send to the server.
381 if (!stdin_eof && packet_not_very_much_data_to_write())
382 FD_SET(fileno(stdin), readset);
384 /* Select stdout/stderr if have data in buffer. */
385 if (buffer_len(&stdout_buffer) > 0)
386 FD_SET(fileno(stdout), writeset);
387 if (buffer_len(&stderr_buffer) > 0)
388 FD_SET(fileno(stderr), writeset);
390 FD_SET(connection_in, readset);
393 /* Add any selections by the channel mechanism. */
394 channel_prepare_select(readset, writeset);
396 /* Select server connection if have data to write to the server. */
397 if (packet_have_data_to_write())
398 FD_SET(connection_out, writeset);
401 /* Update maximum file descriptor number, if appropriate. */
402 if (channel_max_fd() > max_fd)
403 max_fd = channel_max_fd();
406 * Wait for something to happen. This will suspend the process until
407 * some selected descriptor can be read, written, or has some other
408 * event pending. Note: if you want to implement SSH_MSG_IGNORE
409 * messages to fool traffic analysis, this might be the place to do
410 * it: just have a random timeout for the select, and send a random
411 * SSH_MSG_IGNORE packet when the timeout expires.
414 if (select(max_fd + 1, readset, writeset, NULL, NULL) < 0) {
416 /* Some systems fail to clear these automatically. */
421 /* Note: we might still have data in the buffers. */
422 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
423 buffer_append(&stderr_buffer, buf, strlen(buf));
424 stderr_bytes += strlen(buf);
430 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
432 struct winsize oldws, newws;
434 /* Flush stdout and stderr buffers. */
435 if (buffer_len(bout) > 0)
436 atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
437 if (buffer_len(berr) > 0)
438 atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
443 * Free (and clear) the buffer to reduce the amount of data that gets
450 /* Save old window size. */
451 ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
453 /* Send the suspend signal to the program itself. */
454 kill(getpid(), SIGTSTP);
456 /* Check if the window size has changed. */
457 if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
458 (oldws.ws_row != newws.ws_row ||
459 oldws.ws_col != newws.ws_col ||
460 oldws.ws_xpixel != newws.ws_xpixel ||
461 oldws.ws_ypixel != newws.ws_ypixel))
462 received_window_change_signal = 1;
464 /* OK, we have been continued by the user. Reinitialize buffers. */
473 client_process_net_input(fd_set * readset)
479 * Read input from the server, and add any such data to the buffer of
480 * the packet subsystem.
482 if (FD_ISSET(connection_in, readset)) {
483 /* Read as much as possible. */
484 len = read(connection_in, buf, sizeof(buf));
486 /* Received EOF. The remote host has closed the connection. */
487 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
489 buffer_append(&stderr_buffer, buf, strlen(buf));
490 stderr_bytes += strlen(buf);
495 * There is a kernel bug on Solaris that causes select to
496 * sometimes wake up even though there is no data available.
498 if (len < 0 && errno == EAGAIN)
502 /* An error has encountered. Perhaps there is a network problem. */
503 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
504 host, strerror(errno));
505 buffer_append(&stderr_buffer, buf, strlen(buf));
506 stderr_bytes += strlen(buf);
510 packet_process_incoming(buf, len);
514 /* process the characters one by one */
516 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
525 for (i = 0; i < len; i++) {
526 /* Get one character at a time. */
529 if (escape_pending) {
530 /* We have previously seen an escape character. */
531 /* Clear the flag now. */
534 /* Process the escaped character. */
537 /* Terminate the connection. */
538 snprintf(string, sizeof string, "%c.\r\n", escape_char);
539 buffer_append(berr, string, strlen(string));
540 /*stderr_bytes += strlen(string); XXX*/
546 /* Suspend the program. */
547 /* Print a message to that effect to the user. */
548 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
549 buffer_append(berr, string, strlen(string));
550 /*stderr_bytes += strlen(string); XXX*/
552 /* Restore terminal modes and suspend. */
553 client_suspend_self(bin, bout, berr);
555 /* We have been continued. */
559 /* XXX does not work yet with proto 2 */
563 * Detach the program (continue to serve connections,
564 * but put in background and no more new connections).
568 * Sending SSH_CMSG_EOF alone does not always appear
569 * to be enough. So we try to send an EOF character
572 packet_start(SSH_CMSG_STDIN_DATA);
573 packet_put_string("\004", 1);
577 if (buffer_len(bin) == 0) {
578 packet_start(SSH_CMSG_EOF);
582 /* Restore tty modes. */
585 /* Stop listening for new connections. */
586 channel_stop_listening();
588 printf("%c& [backgrounded]\n", escape_char);
590 /* Fork into background. */
593 error("fork: %.100s", strerror(errno));
596 if (pid != 0) { /* This is the parent. */
597 /* The parent just exits. */
600 /* The child continues serving connections. */
604 snprintf(string, sizeof string,
606 Supported escape sequences:\r\n\
607 ~. - terminate connection\r\n\
608 ~^Z - suspend ssh\r\n\
609 ~# - list forwarded connections\r\n\
610 ~& - background ssh (when waiting for connections to terminate)\r\n\
611 ~? - this message\r\n\
612 ~~ - send the escape character by typing it twice\r\n\
613 (Note that escapes are only recognized immediately after newline.)\r\n",
615 buffer_append(berr, string, strlen(string));
619 snprintf(string, sizeof string, "%c#\r\n", escape_char);
620 buffer_append(berr, string, strlen(string));
621 s = channel_open_message();
622 buffer_append(berr, s, strlen(s));
627 if (ch != escape_char) {
628 buffer_put_char(bin, escape_char);
631 /* Escaped characters fall through here */
636 * The previous character was not an escape char. Check if this
639 if (last_was_cr && ch == escape_char) {
640 /* It is. Set the flag and continue to next character. */
647 * Normal character. Record whether it was a newline,
648 * and append it to the buffer.
650 last_was_cr = (ch == '\r' || ch == '\n');
651 buffer_put_char(bin, ch);
658 client_process_input(fd_set * readset)
664 /* Read input from stdin. */
665 if (FD_ISSET(fileno(stdin), readset)) {
666 /* Read as much as possible. */
667 len = read(fileno(stdin), buf, sizeof(buf));
670 * Received EOF or error. They are treated
671 * similarly, except that an error message is printed
672 * if it was an error condition.
675 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
676 buffer_append(&stderr_buffer, buf, strlen(buf));
677 stderr_bytes += strlen(buf);
679 /* Mark that we have seen EOF. */
682 * Send an EOF message to the server unless there is
683 * data in the buffer. If there is data in the
684 * buffer, no message will be sent now. Code
685 * elsewhere will send the EOF when the buffer
686 * becomes empty if stdin_eof is set.
688 if (buffer_len(&stdin_buffer) == 0) {
689 packet_start(SSH_CMSG_EOF);
692 } else if (escape_char == -1) {
694 * Normal successful read, and no escape character.
695 * Just append the data to buffer.
697 buffer_append(&stdin_buffer, buf, len);
701 * Normal, successful read. But we have an escape character
702 * and have to process the characters one by one.
704 ret = process_escapes(&stdin_buffer, &stdout_buffer, &stderr_buffer, buf, len);
713 client_process_output(fd_set * writeset)
718 /* Write buffered output to stdout. */
719 if (FD_ISSET(fileno(stdout), writeset)) {
720 /* Write as much data as possible. */
721 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
722 buffer_len(&stdout_buffer));
728 * An error or EOF was encountered. Put an
729 * error message to stderr buffer.
731 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
732 buffer_append(&stderr_buffer, buf, strlen(buf));
733 stderr_bytes += strlen(buf);
738 /* Consume printed data from the buffer. */
739 buffer_consume(&stdout_buffer, len);
741 /* Write buffered output to stderr. */
742 if (FD_ISSET(fileno(stderr), writeset)) {
743 /* Write as much data as possible. */
744 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
745 buffer_len(&stderr_buffer));
750 /* EOF or error, but can't even print error message. */
755 /* Consume printed characters from the buffer. */
756 buffer_consume(&stderr_buffer, len);
761 * Get packets from the connection input buffer, and process them as long as
762 * there are packets available.
764 * Any unknown packets received during the actual
765 * session cause the session to terminate. This is
766 * intended to make debugging easier since no
767 * confirmations are sent. Any compatible protocol
768 * extensions must be negotiated during the
773 client_process_buffered_input_packets()
775 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL);
778 /* scan buf[] for '~' before sending data to the peer */
781 simple_escape_filter(Channel *c, char *buf, int len)
783 /* XXX we assume c->extended is writeable */
784 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
788 * Implements the interactive session with the server. This is called after
789 * the user has been authenticated, and a command has been started on the
790 * remote host. If escape_char != -1, it is the character used as an escape
791 * character for terminating or suspending the session.
795 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
797 double start_time, total_time;
801 debug("Entering interactive session.");
803 start_time = get_current_time();
805 /* Initialize variables. */
810 buffer_high = 64 * 1024;
811 connection_in = packet_get_connection_in();
812 connection_out = packet_get_connection_out();
813 max_fd = connection_in;
814 if (connection_out > max_fd)
815 max_fd = connection_out;
820 escape_char = escape_char_arg;
822 /* Initialize buffers. */
823 buffer_init(&stdin_buffer);
824 buffer_init(&stdout_buffer);
825 buffer_init(&stderr_buffer);
827 client_init_dispatch();
829 /* Set signal handlers to restore non-blocking mode. */
830 signal(SIGINT, signal_handler);
831 signal(SIGQUIT, signal_handler);
832 signal(SIGTERM, signal_handler);
833 signal(SIGPIPE, SIG_IGN);
835 signal(SIGWINCH, window_change_handler);
840 /* Check if we should immediately send eof on stdin. */
842 client_check_initial_eof_on_stdin();
844 if (compat20 && escape_char != -1)
845 channel_register_filter(ssh2_chan_id, simple_escape_filter);
847 /* Main loop of the client for the interactive session mode. */
848 while (!quit_pending) {
849 fd_set readset, writeset;
851 /* Process buffered packets sent by the server. */
852 client_process_buffered_input_packets();
854 if (compat20 && !channel_still_open()) {
855 debug2("!channel_still_open.");
860 * Make packets of buffered stdin data, and buffer them for
861 * sending to the server.
864 client_make_packets_from_stdin_data();
867 * Make packets from buffered channel data, and buffer them
868 * for sending to the server.
870 if (packet_not_very_much_data_to_write())
871 channel_output_poll();
874 * Check if the window size has changed, and buffer a message
875 * about it to the server if so.
877 client_check_window_change();
883 * Wait until we have something to do (something becomes
884 * available on one of the descriptors).
886 client_wait_until_can_do_something(&readset, &writeset);
891 /* Do channel operations. */
892 channel_after_select(&readset, &writeset);
894 /* Buffer input from the connection. */
895 client_process_net_input(&readset);
901 /* Buffer data from stdin */
902 client_process_input(&readset);
904 * Process output to stdout and stderr. Output to
905 * the connection is processed elsewhere (above).
907 client_process_output(&writeset);
910 /* Send as much buffered packet data as possible to the sender. */
911 if (FD_ISSET(connection_out, &writeset))
915 /* Terminate the session. */
917 /* Stop watching for window change. */
919 signal(SIGWINCH, SIG_DFL);
921 /* Stop listening for connections. */
922 channel_stop_listening();
925 * In interactive mode (with pseudo tty) display a message indicating
926 * that the connection has been closed.
928 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
929 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
930 buffer_append(&stderr_buffer, buf, strlen(buf));
931 stderr_bytes += strlen(buf);
933 /* Output any buffered data for stdout. */
934 while (buffer_len(&stdout_buffer) > 0) {
935 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
936 buffer_len(&stdout_buffer));
938 error("Write failed flushing stdout buffer.");
941 buffer_consume(&stdout_buffer, len);
944 /* Output any buffered data for stderr. */
945 while (buffer_len(&stderr_buffer) > 0) {
946 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
947 buffer_len(&stderr_buffer));
949 error("Write failed flushing stderr buffer.");
952 buffer_consume(&stderr_buffer, len);
958 /* Clear and free any buffers. */
959 memset(buf, 0, sizeof(buf));
960 buffer_free(&stdin_buffer);
961 buffer_free(&stdout_buffer);
962 buffer_free(&stderr_buffer);
964 /* Report bytes transferred, and transfer rates. */
965 total_time = get_current_time() - start_time;
966 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
967 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
969 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
970 stdin_bytes / total_time, stdout_bytes / total_time,
971 stderr_bytes / total_time);
973 /* Return the exit status of the program. */
974 debug("Exit status %d", exit_status);
981 client_input_stdout_data(int type, int plen, void *ctxt)
983 unsigned int data_len;
984 char *data = packet_get_string(&data_len);
985 packet_integrity_check(plen, 4 + data_len, type);
986 buffer_append(&stdout_buffer, data, data_len);
987 stdout_bytes += data_len;
988 memset(data, 0, data_len);
992 client_input_stderr_data(int type, int plen, void *ctxt)
994 unsigned int data_len;
995 char *data = packet_get_string(&data_len);
996 packet_integrity_check(plen, 4 + data_len, type);
997 buffer_append(&stderr_buffer, data, data_len);
998 stdout_bytes += data_len;
999 memset(data, 0, data_len);
1003 client_input_exit_status(int type, int plen, void *ctxt)
1005 packet_integrity_check(plen, 4, type);
1006 exit_status = packet_get_int();
1007 /* Acknowledge the exit. */
1008 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1011 * Must wait for packet to be sent since we are
1014 packet_write_wait();
1015 /* Flag that we want to exit. */
1019 /* XXXX move to generic input handler */
1021 client_input_channel_open(int type, int plen, void *ctxt)
1031 ctype = packet_get_string(&len);
1032 rchan = packet_get_int();
1033 rwindow = packet_get_int();
1034 rmaxpack = packet_get_int();
1036 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1037 ctype, rchan, rwindow, rmaxpack);
1039 if (strcmp(ctype, "x11") == 0 && options.forward_x11) {
1042 int originator_port;
1043 originator = packet_get_string(NULL);
1044 if (datafellows & SSH_BUG_X11FWD) {
1045 debug2("buggy server: x11 request w/o originator_port");
1046 originator_port = 0;
1048 originator_port = packet_get_int();
1051 /* XXX check permission */
1053 /* XXX move to channels.c */
1054 sock = x11_connect_display();
1056 id = channel_new("x11", SSH_CHANNEL_X11_OPEN,
1057 sock, sock, -1, CHAN_X11_WINDOW_DEFAULT,
1058 CHAN_X11_PACKET_DEFAULT, 0, xstrdup("x11"), 1);
1059 c = channel_lookup(id);
1062 /* XXX duplicate : */
1064 debug("confirm %s", ctype);
1065 c->remote_id = rchan;
1066 c->remote_window = rwindow;
1067 c->remote_maxpacket = rmaxpack;
1069 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1070 packet_put_int(c->remote_id);
1071 packet_put_int(c->self);
1072 packet_put_int(c->local_window);
1073 packet_put_int(c->local_maxpacket);
1076 debug("failure %s", ctype);
1077 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1078 packet_put_int(rchan);
1079 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1080 packet_put_cstring("bla bla");
1081 packet_put_cstring("");
1088 client_init_dispatch_20()
1090 dispatch_init(&dispatch_protocol_error);
1091 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1092 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1093 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1094 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1095 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1096 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1097 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1098 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request);
1099 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1102 client_init_dispatch_13()
1104 dispatch_init(NULL);
1105 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1106 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1107 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1108 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1109 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1110 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1111 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1112 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1113 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1115 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1116 &auth_input_open_request : &deny_input_open);
1117 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1118 &x11_input_open : &deny_input_open);
1121 client_init_dispatch_15()
1123 client_init_dispatch_13();
1124 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1125 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1128 client_init_dispatch()
1131 client_init_dispatch_20();
1133 client_init_dispatch_13();
1135 client_init_dispatch_15();
1139 client_input_channel_req(int id, void *arg)
1147 rtype = packet_get_string(&len);
1148 reply = packet_get_char();
1150 debug("client_input_channel_req: rtype %s reply %d", rtype, reply);
1152 c = channel_lookup(id);
1154 fatal("client_input_channel_req: channel %d: bad channel", id);
1156 if (session_ident == -1) {
1157 error("client_input_channel_req: no channel %d", id);
1158 } else if (id != session_ident) {
1159 error("client_input_channel_req: bad channel %d != %d",
1161 } else if (strcmp(rtype, "exit-status") == 0) {
1163 exit_status = packet_get_int();
1167 packet_start(success ?
1168 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1169 packet_put_int(c->remote_id);
1176 client_set_session_ident(int id)
1178 debug2("client_set_session_ident: id %d", id);
1180 channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST,
1181 client_input_channel_req, (void *)0);