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 1.46 2001/01/29 16:55:36 markus Exp $");
78 #include "clientloop.h"
83 extern Options options;
85 /* Flag indicating that stdin should be redirected from /dev/null. */
86 extern int stdin_null_flag;
89 * Name of the host we are connecting to. This is the name given on the
90 * command line, or the HostName specified for the user-supplied name in a
96 * Flag to indicate that we have received a window change signal which has
97 * not yet been processed. This will cause a message indicating the new
98 * window size to be sent to the server a little later. This is volatile
99 * because this is updated in a signal handler.
101 static volatile int received_window_change_signal = 0;
103 /* Terminal modes, as saved by enter_raw_mode. */
104 static struct termios saved_tio;
107 * Flag indicating whether we are in raw mode. This is used by
108 * enter_raw_mode and leave_raw_mode.
110 static int in_raw_mode = 0;
112 /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
113 static int in_non_blocking_mode = 0;
115 /* Common data for the client loop code. */
116 static int quit_pending; /* Set to non-zero to quit the client loop. */
117 static int escape_char; /* Escape character. */
118 static int escape_pending; /* Last character was the escape character */
119 static int last_was_cr; /* Last character was a newline. */
120 static int exit_status; /* Used to store the exit status of the command. */
121 static int stdin_eof; /* EOF has been encountered on standard error. */
122 static Buffer stdin_buffer; /* Buffer for stdin data. */
123 static Buffer stdout_buffer; /* Buffer for stdout data. */
124 static Buffer stderr_buffer; /* Buffer for stderr data. */
125 static u_long stdin_bytes, stdout_bytes, stderr_bytes;
126 static u_int buffer_high;/* Soft max buffer size. */
127 static int connection_in; /* Connection to server (input). */
128 static int connection_out; /* Connection to server (output). */
131 void client_init_dispatch(void);
132 int session_ident = -1;
134 /* Returns the user\'s terminal to normal mode if it had been put in raw mode. */
142 if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0)
145 fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL);
148 /* Puts the user\'s terminal in raw mode. */
155 if (tcgetattr(fileno(stdin), &tio) < 0)
158 tio.c_iflag |= IGNPAR;
159 tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
160 tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
162 tio.c_lflag &= ~IEXTEN;
164 tio.c_oflag &= ~OPOST;
167 if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0)
171 fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL);
174 /* Restores stdin to blocking mode. */
179 if (in_non_blocking_mode) {
180 (void) fcntl(fileno(stdin), F_SETFL, 0);
181 in_non_blocking_mode = 0;
182 fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL);
186 /* Puts stdin terminal in non-blocking mode. */
191 in_non_blocking_mode = 1;
192 (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
193 fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL);
197 * Signal handler for the window change signal (SIGWINCH). This just sets a
198 * flag indicating that the window has changed.
202 window_change_handler(int sig)
204 received_window_change_signal = 1;
205 signal(SIGWINCH, window_change_handler);
209 * Signal handler for signals that cause the program to terminate. These
210 * signals must be trapped to restore terminal modes.
214 signal_handler(int sig)
218 if (in_non_blocking_mode)
219 leave_non_blocking();
220 channel_stop_listening();
222 fatal("Killed by signal %d.", sig);
226 * Returns current time in seconds from Jan 1, 1970 with the maximum
227 * available resolution.
234 gettimeofday(&tv, NULL);
235 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
239 * This is called when the interactive is entered. This checks if there is
240 * an EOF coming on stdin. We must check this explicitly, as select() does
241 * not appear to wake up when redirecting from /dev/null.
245 client_check_initial_eof_on_stdin()
251 * If standard input is to be "redirected from /dev/null", we simply
252 * mark that we have seen an EOF and send an EOF message to the
253 * server. Otherwise, we try to read a single character; it appears
254 * that for some files, such /dev/null, select() never wakes up for
255 * read for this descriptor, which means that we never get EOF. This
256 * way we will get the EOF if stdin comes from /dev/null or similar.
258 if (stdin_null_flag) {
259 /* Fake EOF on stdin. */
260 debug("Sending eof.");
262 packet_start(SSH_CMSG_EOF);
265 enter_non_blocking();
267 /* Check for immediate EOF on stdin. */
268 len = read(fileno(stdin), buf, 1);
270 /* EOF. Record that we have seen it and send EOF to server. */
271 debug("Sending eof.");
273 packet_start(SSH_CMSG_EOF);
275 } else if (len > 0) {
277 * Got data. We must store the data in the buffer,
278 * and also process it as an escape character if
281 if ((u_char) buf[0] == escape_char)
284 buffer_append(&stdin_buffer, buf, 1);
288 leave_non_blocking();
294 * Make packets from buffered stdin data, and buffer them for sending to the
299 client_make_packets_from_stdin_data()
303 /* Send buffered stdin data to the server. */
304 while (buffer_len(&stdin_buffer) > 0 &&
305 packet_not_very_much_data_to_write()) {
306 len = buffer_len(&stdin_buffer);
307 /* Keep the packets at reasonable size. */
308 if (len > packet_get_maxsize())
309 len = packet_get_maxsize();
310 packet_start(SSH_CMSG_STDIN_DATA);
311 packet_put_string(buffer_ptr(&stdin_buffer), len);
313 buffer_consume(&stdin_buffer, len);
314 /* If we have a pending EOF, send it now. */
315 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
316 packet_start(SSH_CMSG_EOF);
323 * Checks if the client window has changed, and sends a packet about it to
324 * the server if so. The actual change is detected elsewhere (by a software
325 * interrupt on Unix); this just checks the flag and sends a message if
330 client_check_window_change()
334 if (! received_window_change_signal)
337 received_window_change_signal = 0;
339 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
342 debug2("client_check_window_change: changed");
345 channel_request_start(session_ident, "window-change", 0);
346 packet_put_int(ws.ws_col);
347 packet_put_int(ws.ws_row);
348 packet_put_int(ws.ws_xpixel);
349 packet_put_int(ws.ws_ypixel);
352 packet_start(SSH_CMSG_WINDOW_SIZE);
353 packet_put_int(ws.ws_row);
354 packet_put_int(ws.ws_col);
355 packet_put_int(ws.ws_xpixel);
356 packet_put_int(ws.ws_ypixel);
362 * Waits until the client can do something (some data becomes available on
363 * one of the file descriptors).
367 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
370 /* Add any selections by the channel mechanism. */
371 channel_prepare_select(readsetp, writesetp, maxfdp);
374 /* Read from the connection, unless our buffers are full. */
375 if (buffer_len(&stdout_buffer) < buffer_high &&
376 buffer_len(&stderr_buffer) < buffer_high &&
377 channel_not_very_much_buffered_data())
378 FD_SET(connection_in, *readsetp);
380 * Read from stdin, unless we have seen EOF or have very much
381 * buffered data to send to the server.
383 if (!stdin_eof && packet_not_very_much_data_to_write())
384 FD_SET(fileno(stdin), *readsetp);
386 /* Select stdout/stderr if have data in buffer. */
387 if (buffer_len(&stdout_buffer) > 0)
388 FD_SET(fileno(stdout), *writesetp);
389 if (buffer_len(&stderr_buffer) > 0)
390 FD_SET(fileno(stderr), *writesetp);
392 FD_SET(connection_in, *readsetp);
395 /* Select server connection if have data to write to the server. */
396 if (packet_have_data_to_write())
397 FD_SET(connection_out, *writesetp);
400 * Wait for something to happen. This will suspend the process until
401 * some selected descriptor can be read, written, or has some other
402 * event pending. Note: if you want to implement SSH_MSG_IGNORE
403 * messages to fool traffic analysis, this might be the place to do
404 * it: just have a random timeout for the select, and send a random
405 * SSH_MSG_IGNORE packet when the timeout expires.
408 if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
412 /* Note: we might still have data in the buffers. */
413 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
414 buffer_append(&stderr_buffer, buf, strlen(buf));
415 stderr_bytes += strlen(buf);
421 client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
423 struct winsize oldws, newws;
425 /* Flush stdout and stderr buffers. */
426 if (buffer_len(bout) > 0)
427 atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
428 if (buffer_len(berr) > 0)
429 atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
434 * Free (and clear) the buffer to reduce the amount of data that gets
441 /* Save old window size. */
442 ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
444 /* Send the suspend signal to the program itself. */
445 kill(getpid(), SIGTSTP);
447 /* Check if the window size has changed. */
448 if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
449 (oldws.ws_row != newws.ws_row ||
450 oldws.ws_col != newws.ws_col ||
451 oldws.ws_xpixel != newws.ws_xpixel ||
452 oldws.ws_ypixel != newws.ws_ypixel))
453 received_window_change_signal = 1;
455 /* OK, we have been continued by the user. Reinitialize buffers. */
464 client_process_net_input(fd_set * readset)
470 * Read input from the server, and add any such data to the buffer of
471 * the packet subsystem.
473 if (FD_ISSET(connection_in, readset)) {
474 /* Read as much as possible. */
475 len = read(connection_in, buf, sizeof(buf));
477 /* Received EOF. The remote host has closed the connection. */
478 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
480 buffer_append(&stderr_buffer, buf, strlen(buf));
481 stderr_bytes += strlen(buf);
486 * There is a kernel bug on Solaris that causes select to
487 * sometimes wake up even though there is no data available.
489 if (len < 0 && errno == EAGAIN)
493 /* An error has encountered. Perhaps there is a network problem. */
494 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
495 host, strerror(errno));
496 buffer_append(&stderr_buffer, buf, strlen(buf));
497 stderr_bytes += strlen(buf);
501 packet_process_incoming(buf, len);
505 /* process the characters one by one */
507 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
516 for (i = 0; i < len; i++) {
517 /* Get one character at a time. */
520 if (escape_pending) {
521 /* We have previously seen an escape character. */
522 /* Clear the flag now. */
525 /* Process the escaped character. */
528 /* Terminate the connection. */
529 snprintf(string, sizeof string, "%c.\r\n", escape_char);
530 buffer_append(berr, string, strlen(string));
531 /*stderr_bytes += strlen(string); XXX*/
537 /* Suspend the program. */
538 /* Print a message to that effect to the user. */
539 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
540 buffer_append(berr, string, strlen(string));
541 /*stderr_bytes += strlen(string); XXX*/
543 /* Restore terminal modes and suspend. */
544 client_suspend_self(bin, bout, berr);
546 /* We have been continued. */
550 /* XXX does not work yet with proto 2 */
554 * Detach the program (continue to serve connections,
555 * but put in background and no more new connections).
559 * Sending SSH_CMSG_EOF alone does not always appear
560 * to be enough. So we try to send an EOF character
563 packet_start(SSH_CMSG_STDIN_DATA);
564 packet_put_string("\004", 1);
568 if (buffer_len(bin) == 0) {
569 packet_start(SSH_CMSG_EOF);
573 /* Restore tty modes. */
576 /* Stop listening for new connections. */
577 channel_stop_listening();
579 printf("%c& [backgrounded]\n", escape_char);
581 /* Fork into background. */
584 error("fork: %.100s", strerror(errno));
587 if (pid != 0) { /* This is the parent. */
588 /* The parent just exits. */
591 /* The child continues serving connections. */
595 snprintf(string, sizeof string,
597 Supported escape sequences:\r\n\
598 ~. - terminate connection\r\n\
599 ~^Z - suspend ssh\r\n\
600 ~# - list forwarded connections\r\n\
601 ~& - background ssh (when waiting for connections to terminate)\r\n\
602 ~? - this message\r\n\
603 ~~ - send the escape character by typing it twice\r\n\
604 (Note that escapes are only recognized immediately after newline.)\r\n",
606 buffer_append(berr, string, strlen(string));
610 snprintf(string, sizeof string, "%c#\r\n", escape_char);
611 buffer_append(berr, string, strlen(string));
612 s = channel_open_message();
613 buffer_append(berr, s, strlen(s));
618 if (ch != escape_char) {
619 buffer_put_char(bin, escape_char);
622 /* Escaped characters fall through here */
627 * The previous character was not an escape char. Check if this
630 if (last_was_cr && ch == escape_char) {
631 /* It is. Set the flag and continue to next character. */
638 * Normal character. Record whether it was a newline,
639 * and append it to the buffer.
641 last_was_cr = (ch == '\r' || ch == '\n');
642 buffer_put_char(bin, ch);
649 client_process_input(fd_set * readset)
655 /* Read input from stdin. */
656 if (FD_ISSET(fileno(stdin), readset)) {
657 /* Read as much as possible. */
658 len = read(fileno(stdin), buf, sizeof(buf));
661 * Received EOF or error. They are treated
662 * similarly, except that an error message is printed
663 * if it was an error condition.
666 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
667 buffer_append(&stderr_buffer, buf, strlen(buf));
668 stderr_bytes += strlen(buf);
670 /* Mark that we have seen EOF. */
673 * Send an EOF message to the server unless there is
674 * data in the buffer. If there is data in the
675 * buffer, no message will be sent now. Code
676 * elsewhere will send the EOF when the buffer
677 * becomes empty if stdin_eof is set.
679 if (buffer_len(&stdin_buffer) == 0) {
680 packet_start(SSH_CMSG_EOF);
683 } else if (escape_char == -1) {
685 * Normal successful read, and no escape character.
686 * Just append the data to buffer.
688 buffer_append(&stdin_buffer, buf, len);
692 * Normal, successful read. But we have an escape character
693 * and have to process the characters one by one.
695 ret = process_escapes(&stdin_buffer, &stdout_buffer, &stderr_buffer, buf, len);
704 client_process_output(fd_set * writeset)
709 /* Write buffered output to stdout. */
710 if (FD_ISSET(fileno(stdout), writeset)) {
711 /* Write as much data as possible. */
712 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
713 buffer_len(&stdout_buffer));
719 * An error or EOF was encountered. Put an
720 * error message to stderr buffer.
722 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
723 buffer_append(&stderr_buffer, buf, strlen(buf));
724 stderr_bytes += strlen(buf);
729 /* Consume printed data from the buffer. */
730 buffer_consume(&stdout_buffer, len);
732 /* Write buffered output to stderr. */
733 if (FD_ISSET(fileno(stderr), writeset)) {
734 /* Write as much data as possible. */
735 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
736 buffer_len(&stderr_buffer));
741 /* EOF or error, but can't even print error message. */
746 /* Consume printed characters from the buffer. */
747 buffer_consume(&stderr_buffer, len);
752 * Get packets from the connection input buffer, and process them as long as
753 * there are packets available.
755 * Any unknown packets received during the actual
756 * session cause the session to terminate. This is
757 * intended to make debugging easier since no
758 * confirmations are sent. Any compatible protocol
759 * extensions must be negotiated during the
764 client_process_buffered_input_packets()
766 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL);
769 /* scan buf[] for '~' before sending data to the peer */
772 simple_escape_filter(Channel *c, char *buf, int len)
774 /* XXX we assume c->extended is writeable */
775 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
779 * Implements the interactive session with the server. This is called after
780 * the user has been authenticated, and a command has been started on the
781 * remote host. If escape_char != -1, it is the character used as an escape
782 * character for terminating or suspending the session.
786 client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
788 fd_set *readset = NULL, *writeset = NULL;
790 double start_time, total_time;
794 debug("Entering interactive session.");
796 start_time = get_current_time();
798 /* Initialize variables. */
803 buffer_high = 64 * 1024;
804 connection_in = packet_get_connection_in();
805 connection_out = packet_get_connection_out();
806 max_fd = MAX(connection_in, connection_out);
809 max_fd = MAX(max_fd, fileno(stdin));
810 max_fd = MAX(max_fd, fileno(stdout));
811 max_fd = MAX(max_fd, fileno(stderr));
817 escape_char = escape_char_arg;
819 /* Initialize buffers. */
820 buffer_init(&stdin_buffer);
821 buffer_init(&stdout_buffer);
822 buffer_init(&stderr_buffer);
824 client_init_dispatch();
826 /* Set signal handlers to restore non-blocking mode. */
827 signal(SIGINT, signal_handler);
828 signal(SIGQUIT, signal_handler);
829 signal(SIGTERM, signal_handler);
830 signal(SIGPIPE, SIG_IGN);
832 signal(SIGWINCH, window_change_handler);
837 /* Check if we should immediately send eof on stdin. */
839 client_check_initial_eof_on_stdin();
841 if (compat20 && escape_char != -1)
842 channel_register_filter(ssh2_chan_id, simple_escape_filter);
844 /* Main loop of the client for the interactive session mode. */
845 while (!quit_pending) {
847 /* Process buffered packets sent by the server. */
848 client_process_buffered_input_packets();
850 if (compat20 && !channel_still_open()) {
851 debug2("!channel_still_open.");
856 * Make packets of buffered stdin data, and buffer them for
857 * sending to the server.
860 client_make_packets_from_stdin_data();
863 * Make packets from buffered channel data, and enqueue them
864 * for sending to the server.
866 if (packet_not_very_much_data_to_write())
867 channel_output_poll();
870 * Check if the window size has changed, and buffer a message
871 * about it to the server if so.
873 client_check_window_change();
879 * Wait until we have something to do (something becomes
880 * available on one of the descriptors).
882 client_wait_until_can_do_something(&readset, &writeset, &max_fd);
887 /* Do channel operations. */
888 channel_after_select(readset, writeset);
890 /* Buffer input from the connection. */
891 client_process_net_input(readset);
897 /* Buffer data from stdin */
898 client_process_input(readset);
900 * Process output to stdout and stderr. Output to
901 * the connection is processed elsewhere (above).
903 client_process_output(writeset);
906 /* Send as much buffered packet data as possible to the sender. */
907 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)
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)
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. */
1020 client_request_forwarded_tcpip(const char *request_type, int rchan)
1023 char *listen_address, *originator_address;
1024 int listen_port, originator_port;
1027 /* Get rest of the packet */
1028 listen_address = packet_get_string(NULL);
1029 listen_port = packet_get_int();
1030 originator_address = packet_get_string(NULL);
1031 originator_port = packet_get_int();
1034 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1035 listen_address, listen_port, originator_address, originator_port);
1037 sock = channel_connect_by_listen_adress(listen_port);
1039 newch = channel_new("forwarded-tcpip",
1040 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1041 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1042 xstrdup(originator_address), 1);
1043 c = channel_lookup(newch);
1045 xfree(originator_address);
1046 xfree(listen_address);
1051 client_request_x11(const char *request_type, int rchan)
1055 int originator_port;
1058 if (!options.forward_x11) {
1059 error("Warning: ssh server tried X11 forwarding.");
1060 error("Warning: this is probably a break in attempt by a malicious server.");
1063 originator = packet_get_string(NULL);
1064 if (datafellows & SSH_BUG_X11FWD) {
1065 debug2("buggy server: x11 request w/o originator_port");
1066 originator_port = 0;
1068 originator_port = packet_get_int();
1071 /* XXX check permission */
1072 sock = x11_connect_display();
1074 newch = channel_new("x11",
1075 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1076 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
1078 c = channel_lookup(newch);
1085 client_request_agent(const char *request_type, int rchan)
1090 if (!options.forward_agent) {
1091 error("Warning: ssh server tried agent forwarding.");
1092 error("Warning: this is probably a break in attempt by a malicious server.");
1095 sock = ssh_get_authentication_socket();
1097 newch = channel_new("authentication agent connection",
1098 SSH_CHANNEL_OPEN, sock, sock, -1,
1099 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1100 xstrdup("authentication agent connection"), 1);
1101 c = channel_lookup(newch);
1106 /* XXXX move to generic input handler */
1108 client_input_channel_open(int type, int plen, void *ctxt)
1117 ctype = packet_get_string(&len);
1118 rchan = packet_get_int();
1119 rwindow = packet_get_int();
1120 rmaxpack = packet_get_int();
1122 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1123 ctype, rchan, rwindow, rmaxpack);
1125 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1126 c = client_request_forwarded_tcpip(ctype, rchan);
1127 } else if (strcmp(ctype, "x11") == 0) {
1128 c = client_request_x11(ctype, rchan);
1129 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1130 c = client_request_agent(ctype, rchan);
1132 /* XXX duplicate : */
1134 debug("confirm %s", ctype);
1135 c->remote_id = rchan;
1136 c->remote_window = rwindow;
1137 c->remote_maxpacket = rmaxpack;
1139 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1140 packet_put_int(c->remote_id);
1141 packet_put_int(c->self);
1142 packet_put_int(c->local_window);
1143 packet_put_int(c->local_maxpacket);
1146 debug("failure %s", ctype);
1147 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1148 packet_put_int(rchan);
1149 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1150 packet_put_cstring("bla bla");
1151 packet_put_cstring("");
1158 client_init_dispatch_20()
1160 dispatch_init(&dispatch_protocol_error);
1161 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1162 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1163 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1164 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1165 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1166 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1167 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1168 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request);
1169 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1172 client_init_dispatch_13()
1174 dispatch_init(NULL);
1175 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1176 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1177 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1178 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1179 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1180 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1181 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1182 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1183 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1185 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1186 &auth_input_open_request : &deny_input_open);
1187 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1188 &x11_input_open : &deny_input_open);
1191 client_init_dispatch_15()
1193 client_init_dispatch_13();
1194 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1195 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1198 client_init_dispatch()
1201 client_init_dispatch_20();
1203 client_init_dispatch_13();
1205 client_init_dispatch_15();
1209 client_input_channel_req(int id, void *arg)
1217 rtype = packet_get_string(&len);
1218 reply = packet_get_char();
1220 debug("client_input_channel_req: rtype %s reply %d", rtype, reply);
1222 c = channel_lookup(id);
1224 fatal("client_input_channel_req: channel %d: bad channel", id);
1226 if (session_ident == -1) {
1227 error("client_input_channel_req: no channel %d", id);
1228 } else if (id != session_ident) {
1229 error("client_input_channel_req: bad channel %d != %d",
1231 } else if (strcmp(rtype, "exit-status") == 0) {
1233 exit_status = packet_get_int();
1237 packet_start(success ?
1238 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1239 packet_put_int(c->remote_id);
1246 clientloop_set_session_ident(int id)
1248 debug2("clientloop_set_session_ident: id %d", id);
1250 channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST,
1251 client_input_channel_req, (void *)0);