Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.42
1.1 deraadt 1: /*
1.12 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.33 deraadt 5: * The main loop for the interactive session (client side).
1.20 markus 6: *
1.33 deraadt 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".
12: *
13: *
14: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
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.
24: *
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.
1.20 markus 35: *
36: *
1.33 deraadt 37: * SSH2 support added by Markus Friedl.
38: * Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
1.20 markus 39: *
1.33 deraadt 40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
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.
48: *
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.
1.12 deraadt 59: */
1.1 deraadt 60:
61: #include "includes.h"
1.42 ! markus 62: RCSID("$OpenBSD: clientloop.c,v 1.41 2000/12/05 20:34:10 markus Exp $");
1.1 deraadt 63:
64: #include "xmalloc.h"
65: #include "ssh.h"
66: #include "packet.h"
67: #include "buffer.h"
1.8 markus 68: #include "readconf.h"
1.1 deraadt 69:
1.16 markus 70: #include "ssh2.h"
1.15 markus 71: #include "compat.h"
72: #include "channels.h"
73: #include "dispatch.h"
74:
1.30 markus 75: #include "buffer.h"
76: #include "bufaux.h"
77:
1.40 markus 78: #include <openssl/dsa.h>
79: #include <openssl/rsa.h>
80: #include "key.h"
81: #include "authfd.h"
1.39 markus 82:
83: /* import options */
84: extern Options options;
85:
1.1 deraadt 86: /* Flag indicating that stdin should be redirected from /dev/null. */
87: extern int stdin_null_flag;
88:
1.13 markus 89: /*
90: * Name of the host we are connecting to. This is the name given on the
91: * command line, or the HostName specified for the user-supplied name in a
92: * configuration file.
93: */
1.1 deraadt 94: extern char *host;
95:
1.13 markus 96: /*
97: * Flag to indicate that we have received a window change signal which has
98: * not yet been processed. This will cause a message indicating the new
99: * window size to be sent to the server a little later. This is volatile
100: * because this is updated in a signal handler.
101: */
1.1 deraadt 102: static volatile int received_window_change_signal = 0;
103:
104: /* Terminal modes, as saved by enter_raw_mode. */
105: static struct termios saved_tio;
106:
1.13 markus 107: /*
108: * Flag indicating whether we are in raw mode. This is used by
109: * enter_raw_mode and leave_raw_mode.
110: */
1.1 deraadt 111: static int in_raw_mode = 0;
112:
113: /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
114: static int in_non_blocking_mode = 0;
115:
116: /* Common data for the client loop code. */
1.31 markus 117: static int quit_pending; /* Set to non-zero to quit the client loop. */
118: static int escape_char; /* Escape character. */
1.11 markus 119: static int escape_pending; /* Last character was the escape character */
120: static int last_was_cr; /* Last character was a newline. */
121: static int exit_status; /* Used to store the exit status of the command. */
122: static int stdin_eof; /* EOF has been encountered on standard error. */
123: static Buffer stdin_buffer; /* Buffer for stdin data. */
124: static Buffer stdout_buffer; /* Buffer for stdout data. */
125: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 ! markus 126: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
! 127: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 128: static int max_fd; /* Maximum file descriptor number in select(). */
129: static int connection_in; /* Connection to server (input). */
130: static int connection_out; /* Connection to server (output). */
1.1 deraadt 131:
1.16 markus 132:
133: void client_init_dispatch(void);
134: int session_ident = -1;
135:
1.13 markus 136: /* Returns the user\'s terminal to normal mode if it had been put in raw mode. */
1.1 deraadt 137:
1.20 markus 138: void
1.11 markus 139: leave_raw_mode()
1.1 deraadt 140: {
1.11 markus 141: if (!in_raw_mode)
142: return;
143: in_raw_mode = 0;
144: if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0)
145: perror("tcsetattr");
1.1 deraadt 146:
1.11 markus 147: fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL);
1.1 deraadt 148: }
149:
150: /* Puts the user\'s terminal in raw mode. */
151:
1.20 markus 152: void
1.11 markus 153: enter_raw_mode()
1.1 deraadt 154: {
1.11 markus 155: struct termios tio;
1.1 deraadt 156:
1.11 markus 157: if (tcgetattr(fileno(stdin), &tio) < 0)
158: perror("tcgetattr");
159: saved_tio = tio;
160: tio.c_iflag |= IGNPAR;
161: tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
162: tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
1.1 deraadt 163: #ifdef IEXTEN
1.11 markus 164: tio.c_lflag &= ~IEXTEN;
165: #endif /* IEXTEN */
166: tio.c_oflag &= ~OPOST;
167: tio.c_cc[VMIN] = 1;
168: tio.c_cc[VTIME] = 0;
169: if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0)
170: perror("tcsetattr");
171: in_raw_mode = 1;
1.1 deraadt 172:
1.11 markus 173: fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL);
174: }
1.1 deraadt 175:
176: /* Restores stdin to blocking mode. */
177:
1.20 markus 178: void
1.11 markus 179: leave_non_blocking()
1.1 deraadt 180: {
1.11 markus 181: if (in_non_blocking_mode) {
182: (void) fcntl(fileno(stdin), F_SETFL, 0);
183: in_non_blocking_mode = 0;
184: fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL);
185: }
1.1 deraadt 186: }
187:
1.11 markus 188: /* Puts stdin terminal in non-blocking mode. */
189:
1.20 markus 190: void
1.11 markus 191: enter_non_blocking()
1.1 deraadt 192: {
1.11 markus 193: in_non_blocking_mode = 1;
194: (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
195: fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL);
1.1 deraadt 196: }
197:
1.13 markus 198: /*
199: * Signal handler for the window change signal (SIGWINCH). This just sets a
200: * flag indicating that the window has changed.
201: */
1.1 deraadt 202:
1.20 markus 203: void
1.11 markus 204: window_change_handler(int sig)
1.1 deraadt 205: {
1.11 markus 206: received_window_change_signal = 1;
207: signal(SIGWINCH, window_change_handler);
1.1 deraadt 208: }
209:
1.13 markus 210: /*
211: * Signal handler for signals that cause the program to terminate. These
212: * signals must be trapped to restore terminal modes.
213: */
1.1 deraadt 214:
1.20 markus 215: void
1.11 markus 216: signal_handler(int sig)
1.1 deraadt 217: {
1.11 markus 218: if (in_raw_mode)
219: leave_raw_mode();
220: if (in_non_blocking_mode)
221: leave_non_blocking();
222: channel_stop_listening();
223: packet_close();
224: fatal("Killed by signal %d.", sig);
1.1 deraadt 225: }
226:
1.13 markus 227: /*
228: * Returns current time in seconds from Jan 1, 1970 with the maximum
229: * available resolution.
230: */
1.1 deraadt 231:
1.20 markus 232: double
1.11 markus 233: get_current_time()
1.1 deraadt 234: {
1.11 markus 235: struct timeval tv;
236: gettimeofday(&tv, NULL);
237: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.1 deraadt 238: }
239:
1.13 markus 240: /*
241: * This is called when the interactive is entered. This checks if there is
242: * an EOF coming on stdin. We must check this explicitly, as select() does
243: * not appear to wake up when redirecting from /dev/null.
244: */
1.1 deraadt 245:
1.20 markus 246: void
1.11 markus 247: client_check_initial_eof_on_stdin()
1.1 deraadt 248: {
1.11 markus 249: int len;
250: char buf[1];
1.1 deraadt 251:
1.13 markus 252: /*
253: * If standard input is to be "redirected from /dev/null", we simply
254: * mark that we have seen an EOF and send an EOF message to the
255: * server. Otherwise, we try to read a single character; it appears
256: * that for some files, such /dev/null, select() never wakes up for
257: * read for this descriptor, which means that we never get EOF. This
258: * way we will get the EOF if stdin comes from /dev/null or similar.
259: */
1.11 markus 260: if (stdin_null_flag) {
261: /* Fake EOF on stdin. */
262: debug("Sending eof.");
263: stdin_eof = 1;
264: packet_start(SSH_CMSG_EOF);
265: packet_send();
266: } else {
267: enter_non_blocking();
268:
269: /* Check for immediate EOF on stdin. */
270: len = read(fileno(stdin), buf, 1);
271: if (len == 0) {
1.13 markus 272: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 273: debug("Sending eof.");
274: stdin_eof = 1;
275: packet_start(SSH_CMSG_EOF);
276: packet_send();
277: } else if (len > 0) {
1.13 markus 278: /*
279: * Got data. We must store the data in the buffer,
280: * and also process it as an escape character if
281: * appropriate.
282: */
1.42 ! markus 283: if ((u_char) buf[0] == escape_char)
1.11 markus 284: escape_pending = 1;
285: else {
286: buffer_append(&stdin_buffer, buf, 1);
287: stdin_bytes += 1;
288: }
289: }
290: leave_non_blocking();
291: }
1.1 deraadt 292: }
293:
294:
1.13 markus 295: /*
296: * Make packets from buffered stdin data, and buffer them for sending to the
297: * connection.
298: */
1.1 deraadt 299:
1.20 markus 300: void
1.11 markus 301: client_make_packets_from_stdin_data()
1.1 deraadt 302: {
1.42 ! markus 303: u_int len;
1.1 deraadt 304:
1.11 markus 305: /* Send buffered stdin data to the server. */
306: while (buffer_len(&stdin_buffer) > 0 &&
307: packet_not_very_much_data_to_write()) {
308: len = buffer_len(&stdin_buffer);
309: /* Keep the packets at reasonable size. */
310: if (len > packet_get_maxsize())
311: len = packet_get_maxsize();
312: packet_start(SSH_CMSG_STDIN_DATA);
313: packet_put_string(buffer_ptr(&stdin_buffer), len);
314: packet_send();
315: buffer_consume(&stdin_buffer, len);
316: /* If we have a pending EOF, send it now. */
317: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
318: packet_start(SSH_CMSG_EOF);
319: packet_send();
320: }
1.1 deraadt 321: }
322: }
323:
1.13 markus 324: /*
325: * Checks if the client window has changed, and sends a packet about it to
326: * the server if so. The actual change is detected elsewhere (by a software
327: * interrupt on Unix); this just checks the flag and sends a message if
328: * appropriate.
329: */
1.1 deraadt 330:
1.20 markus 331: void
1.11 markus 332: client_check_window_change()
1.1 deraadt 333: {
1.16 markus 334: struct winsize ws;
335:
336: if (! received_window_change_signal)
337: return;
338: /** XXX race */
339: received_window_change_signal = 0;
340:
341: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
342: return;
343:
1.37 markus 344: debug2("client_check_window_change: changed");
1.16 markus 345:
346: if (compat20) {
347: channel_request_start(session_ident, "window-change", 0);
348: packet_put_int(ws.ws_col);
349: packet_put_int(ws.ws_row);
350: packet_put_int(ws.ws_xpixel);
351: packet_put_int(ws.ws_ypixel);
352: packet_send();
353: } else {
354: packet_start(SSH_CMSG_WINDOW_SIZE);
355: packet_put_int(ws.ws_row);
356: packet_put_int(ws.ws_col);
357: packet_put_int(ws.ws_xpixel);
358: packet_put_int(ws.ws_ypixel);
359: packet_send();
1.1 deraadt 360: }
361: }
362:
1.13 markus 363: /*
364: * Waits until the client can do something (some data becomes available on
365: * one of the file descriptors).
366: */
1.1 deraadt 367:
1.20 markus 368: void
1.11 markus 369: client_wait_until_can_do_something(fd_set * readset, fd_set * writeset)
370: {
371: /* Initialize select masks. */
372: FD_ZERO(readset);
1.17 markus 373: FD_ZERO(writeset);
1.11 markus 374:
1.16 markus 375: if (!compat20) {
1.17 markus 376: /* Read from the connection, unless our buffers are full. */
1.16 markus 377: if (buffer_len(&stdout_buffer) < buffer_high &&
378: buffer_len(&stderr_buffer) < buffer_high &&
379: channel_not_very_much_buffered_data())
380: FD_SET(connection_in, readset);
1.17 markus 381: /*
382: * Read from stdin, unless we have seen EOF or have very much
383: * buffered data to send to the server.
384: */
385: if (!stdin_eof && packet_not_very_much_data_to_write())
386: FD_SET(fileno(stdin), readset);
387:
388: /* Select stdout/stderr if have data in buffer. */
389: if (buffer_len(&stdout_buffer) > 0)
390: FD_SET(fileno(stdout), writeset);
391: if (buffer_len(&stderr_buffer) > 0)
392: FD_SET(fileno(stderr), writeset);
1.16 markus 393: } else {
1.11 markus 394: FD_SET(connection_in, readset);
1.16 markus 395: }
1.11 markus 396:
397: /* Add any selections by the channel mechanism. */
398: channel_prepare_select(readset, writeset);
399:
400: /* Select server connection if have data to write to the server. */
401: if (packet_have_data_to_write())
402: FD_SET(connection_out, writeset);
403:
1.16 markus 404: /* move UP XXX */
1.11 markus 405: /* Update maximum file descriptor number, if appropriate. */
406: if (channel_max_fd() > max_fd)
407: max_fd = channel_max_fd();
408:
1.13 markus 409: /*
410: * Wait for something to happen. This will suspend the process until
411: * some selected descriptor can be read, written, or has some other
412: * event pending. Note: if you want to implement SSH_MSG_IGNORE
413: * messages to fool traffic analysis, this might be the place to do
414: * it: just have a random timeout for the select, and send a random
415: * SSH_MSG_IGNORE packet when the timeout expires.
416: */
1.11 markus 417:
418: if (select(max_fd + 1, readset, writeset, NULL, NULL) < 0) {
419: char buf[100];
420: /* Some systems fail to clear these automatically. */
421: FD_ZERO(readset);
422: FD_ZERO(writeset);
423: if (errno == EINTR)
424: return;
425: /* Note: we might still have data in the buffers. */
426: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
427: buffer_append(&stderr_buffer, buf, strlen(buf));
428: stderr_bytes += strlen(buf);
429: quit_pending = 1;
430: }
431: }
432:
1.20 markus 433: void
1.31 markus 434: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 435: {
1.11 markus 436: struct winsize oldws, newws;
437:
438: /* Flush stdout and stderr buffers. */
1.31 markus 439: if (buffer_len(bout) > 0)
440: atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
441: if (buffer_len(berr) > 0)
442: atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 443:
444: leave_raw_mode();
445:
1.13 markus 446: /*
447: * Free (and clear) the buffer to reduce the amount of data that gets
448: * written to swap.
449: */
1.31 markus 450: buffer_free(bin);
451: buffer_free(bout);
452: buffer_free(berr);
1.11 markus 453:
454: /* Save old window size. */
455: ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
456:
457: /* Send the suspend signal to the program itself. */
458: kill(getpid(), SIGTSTP);
459:
460: /* Check if the window size has changed. */
461: if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
462: (oldws.ws_row != newws.ws_row ||
463: oldws.ws_col != newws.ws_col ||
464: oldws.ws_xpixel != newws.ws_xpixel ||
465: oldws.ws_ypixel != newws.ws_ypixel))
466: received_window_change_signal = 1;
467:
468: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 469: buffer_init(bin);
470: buffer_init(bout);
471: buffer_init(berr);
1.11 markus 472:
473: enter_raw_mode();
474: }
475:
1.20 markus 476: void
1.17 markus 477: client_process_net_input(fd_set * readset)
1.11 markus 478: {
1.17 markus 479: int len;
480: char buf[8192];
1.11 markus 481:
1.13 markus 482: /*
483: * Read input from the server, and add any such data to the buffer of
484: * the packet subsystem.
485: */
1.11 markus 486: if (FD_ISSET(connection_in, readset)) {
487: /* Read as much as possible. */
488: len = read(connection_in, buf, sizeof(buf));
489: if (len == 0) {
490: /* Received EOF. The remote host has closed the connection. */
491: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
492: host);
1.1 deraadt 493: buffer_append(&stderr_buffer, buf, strlen(buf));
494: stderr_bytes += strlen(buf);
495: quit_pending = 1;
496: return;
1.11 markus 497: }
1.13 markus 498: /*
499: * There is a kernel bug on Solaris that causes select to
500: * sometimes wake up even though there is no data available.
501: */
1.11 markus 502: if (len < 0 && errno == EAGAIN)
503: len = 0;
504:
505: if (len < 0) {
506: /* An error has encountered. Perhaps there is a network problem. */
507: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
508: host, strerror(errno));
509: buffer_append(&stderr_buffer, buf, strlen(buf));
510: stderr_bytes += strlen(buf);
511: quit_pending = 1;
512: return;
513: }
514: packet_process_incoming(buf, len);
515: }
1.17 markus 516: }
1.16 markus 517:
1.31 markus 518: /* process the characters one by one */
519: int
520: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
521: {
1.32 markus 522: char string[1024];
1.31 markus 523: pid_t pid;
524: int bytes = 0;
1.42 ! markus 525: u_int i;
! 526: u_char ch;
1.31 markus 527: char *s;
528:
529: for (i = 0; i < len; i++) {
530: /* Get one character at a time. */
531: ch = buf[i];
532:
533: if (escape_pending) {
534: /* We have previously seen an escape character. */
535: /* Clear the flag now. */
536: escape_pending = 0;
537:
538: /* Process the escaped character. */
539: switch (ch) {
540: case '.':
541: /* Terminate the connection. */
1.32 markus 542: snprintf(string, sizeof string, "%c.\r\n", escape_char);
543: buffer_append(berr, string, strlen(string));
544: /*stderr_bytes += strlen(string); XXX*/
1.31 markus 545:
546: quit_pending = 1;
547: return -1;
548:
549: case 'Z' - 64:
550: /* Suspend the program. */
551: /* Print a message to that effect to the user. */
1.32 markus 552: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
553: buffer_append(berr, string, strlen(string));
554: /*stderr_bytes += strlen(string); XXX*/
1.31 markus 555:
556: /* Restore terminal modes and suspend. */
557: client_suspend_self(bin, bout, berr);
558:
559: /* We have been continued. */
560: continue;
561:
562: case '&':
563: /* XXX does not work yet with proto 2 */
564: if (compat20)
565: continue;
566: /*
567: * Detach the program (continue to serve connections,
568: * but put in background and no more new connections).
569: */
570: if (!stdin_eof) {
571: /*
572: * Sending SSH_CMSG_EOF alone does not always appear
573: * to be enough. So we try to send an EOF character
574: * first.
575: */
576: packet_start(SSH_CMSG_STDIN_DATA);
577: packet_put_string("\004", 1);
578: packet_send();
579: /* Close stdin. */
580: stdin_eof = 1;
581: if (buffer_len(bin) == 0) {
582: packet_start(SSH_CMSG_EOF);
583: packet_send();
584: }
585: }
586: /* Restore tty modes. */
587: leave_raw_mode();
588:
589: /* Stop listening for new connections. */
590: channel_stop_listening();
591:
592: printf("%c& [backgrounded]\n", escape_char);
593:
594: /* Fork into background. */
595: pid = fork();
596: if (pid < 0) {
597: error("fork: %.100s", strerror(errno));
598: continue;
599: }
600: if (pid != 0) { /* This is the parent. */
601: /* The parent just exits. */
602: exit(0);
603: }
604: /* The child continues serving connections. */
605: continue; /*XXX ? */
606:
607: case '?':
1.32 markus 608: snprintf(string, sizeof string,
1.31 markus 609: "%c?\r\n\
610: Supported escape sequences:\r\n\
611: ~. - terminate connection\r\n\
612: ~^Z - suspend ssh\r\n\
613: ~# - list forwarded connections\r\n\
614: ~& - background ssh (when waiting for connections to terminate)\r\n\
615: ~? - this message\r\n\
616: ~~ - send the escape character by typing it twice\r\n\
617: (Note that escapes are only recognized immediately after newline.)\r\n",
618: escape_char);
1.32 markus 619: buffer_append(berr, string, strlen(string));
1.31 markus 620: continue;
621:
622: case '#':
1.32 markus 623: snprintf(string, sizeof string, "%c#\r\n", escape_char);
624: buffer_append(berr, string, strlen(string));
1.31 markus 625: s = channel_open_message();
626: buffer_append(berr, s, strlen(s));
627: xfree(s);
628: continue;
629:
630: default:
631: if (ch != escape_char) {
632: buffer_put_char(bin, escape_char);
633: bytes++;
634: }
635: /* Escaped characters fall through here */
636: break;
637: }
638: } else {
639: /*
640: * The previous character was not an escape char. Check if this
641: * is an escape.
642: */
643: if (last_was_cr && ch == escape_char) {
644: /* It is. Set the flag and continue to next character. */
645: escape_pending = 1;
646: continue;
647: }
648: }
649:
650: /*
651: * Normal character. Record whether it was a newline,
652: * and append it to the buffer.
653: */
654: last_was_cr = (ch == '\r' || ch == '\n');
655: buffer_put_char(bin, ch);
656: bytes++;
657: }
658: return bytes;
659: }
660:
1.20 markus 661: void
1.17 markus 662: client_process_input(fd_set * readset)
663: {
1.31 markus 664: int ret;
1.21 deraadt 665: int len;
1.31 markus 666: char buf[8192];
1.16 markus 667:
1.11 markus 668: /* Read input from stdin. */
669: if (FD_ISSET(fileno(stdin), readset)) {
670: /* Read as much as possible. */
671: len = read(fileno(stdin), buf, sizeof(buf));
672: if (len <= 0) {
1.13 markus 673: /*
674: * Received EOF or error. They are treated
675: * similarly, except that an error message is printed
676: * if it was an error condition.
677: */
1.11 markus 678: if (len < 0) {
679: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
680: buffer_append(&stderr_buffer, buf, strlen(buf));
681: stderr_bytes += strlen(buf);
682: }
683: /* Mark that we have seen EOF. */
684: stdin_eof = 1;
1.13 markus 685: /*
686: * Send an EOF message to the server unless there is
687: * data in the buffer. If there is data in the
688: * buffer, no message will be sent now. Code
689: * elsewhere will send the EOF when the buffer
690: * becomes empty if stdin_eof is set.
691: */
1.11 markus 692: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 693: packet_start(SSH_CMSG_EOF);
694: packet_send();
1.11 markus 695: }
696: } else if (escape_char == -1) {
1.13 markus 697: /*
698: * Normal successful read, and no escape character.
699: * Just append the data to buffer.
700: */
1.11 markus 701: buffer_append(&stdin_buffer, buf, len);
702: stdin_bytes += len;
703: } else {
1.13 markus 704: /*
705: * Normal, successful read. But we have an escape character
706: * and have to process the characters one by one.
707: */
1.31 markus 708: ret = process_escapes(&stdin_buffer, &stdout_buffer, &stderr_buffer, buf, len);
709: if (ret == -1)
710: return;
711: stdout_bytes += ret;
1.11 markus 712: }
713: }
714: }
715:
1.20 markus 716: void
1.11 markus 717: client_process_output(fd_set * writeset)
718: {
719: int len;
720: char buf[100];
1.1 deraadt 721:
1.11 markus 722: /* Write buffered output to stdout. */
723: if (FD_ISSET(fileno(stdout), writeset)) {
724: /* Write as much data as possible. */
725: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 726: buffer_len(&stdout_buffer));
1.11 markus 727: if (len <= 0) {
728: if (errno == EAGAIN)
729: len = 0;
730: else {
1.13 markus 731: /*
732: * An error or EOF was encountered. Put an
733: * error message to stderr buffer.
734: */
1.11 markus 735: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
736: buffer_append(&stderr_buffer, buf, strlen(buf));
737: stderr_bytes += strlen(buf);
738: quit_pending = 1;
739: return;
740: }
741: }
742: /* Consume printed data from the buffer. */
743: buffer_consume(&stdout_buffer, len);
744: }
745: /* Write buffered output to stderr. */
746: if (FD_ISSET(fileno(stderr), writeset)) {
747: /* Write as much data as possible. */
748: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 749: buffer_len(&stderr_buffer));
1.11 markus 750: if (len <= 0) {
751: if (errno == EAGAIN)
752: len = 0;
753: else {
1.13 markus 754: /* EOF or error, but can't even print error message. */
1.11 markus 755: quit_pending = 1;
756: return;
757: }
758: }
759: /* Consume printed characters from the buffer. */
760: buffer_consume(&stderr_buffer, len);
761: }
1.1 deraadt 762: }
763:
1.13 markus 764: /*
1.15 markus 765: * Get packets from the connection input buffer, and process them as long as
766: * there are packets available.
767: *
768: * Any unknown packets received during the actual
769: * session cause the session to terminate. This is
770: * intended to make debugging easier since no
771: * confirmations are sent. Any compatible protocol
772: * extensions must be negotiated during the
773: * preparatory phase.
774: */
775:
1.20 markus 776: void
1.15 markus 777: client_process_buffered_input_packets()
778: {
1.36 markus 779: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL);
1.15 markus 780: }
781:
1.31 markus 782: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 783:
784: int
1.31 markus 785: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 786: {
1.31 markus 787: /* XXX we assume c->extended is writeable */
788: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 789: }
790:
1.15 markus 791: /*
1.13 markus 792: * Implements the interactive session with the server. This is called after
793: * the user has been authenticated, and a command has been started on the
794: * remote host. If escape_char != -1, it is the character used as an escape
795: * character for terminating or suspending the session.
796: */
1.1 deraadt 797:
1.20 markus 798: int
1.30 markus 799: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 800: {
1.11 markus 801: double start_time, total_time;
802: int len;
803: char buf[100];
804:
805: debug("Entering interactive session.");
806:
807: start_time = get_current_time();
808:
809: /* Initialize variables. */
810: escape_pending = 0;
811: last_was_cr = 1;
812: exit_status = -1;
813: stdin_eof = 0;
814: buffer_high = 64 * 1024;
815: connection_in = packet_get_connection_in();
816: connection_out = packet_get_connection_out();
817: max_fd = connection_in;
818: if (connection_out > max_fd)
819: max_fd = connection_out;
820: stdin_bytes = 0;
821: stdout_bytes = 0;
822: stderr_bytes = 0;
823: quit_pending = 0;
824: escape_char = escape_char_arg;
825:
826: /* Initialize buffers. */
827: buffer_init(&stdin_buffer);
828: buffer_init(&stdout_buffer);
829: buffer_init(&stderr_buffer);
830:
1.15 markus 831: client_init_dispatch();
832:
1.11 markus 833: /* Set signal handlers to restore non-blocking mode. */
834: signal(SIGINT, signal_handler);
835: signal(SIGQUIT, signal_handler);
836: signal(SIGTERM, signal_handler);
837: signal(SIGPIPE, SIG_IGN);
838: if (have_pty)
839: signal(SIGWINCH, window_change_handler);
840:
841: if (have_pty)
842: enter_raw_mode();
843:
1.28 provos 844: /* Check if we should immediately send eof on stdin. */
1.17 markus 845: if (!compat20)
1.16 markus 846: client_check_initial_eof_on_stdin();
1.11 markus 847:
1.30 markus 848: if (compat20 && escape_char != -1)
849: channel_register_filter(ssh2_chan_id, simple_escape_filter);
850:
1.11 markus 851: /* Main loop of the client for the interactive session mode. */
852: while (!quit_pending) {
853: fd_set readset, writeset;
854:
1.13 markus 855: /* Process buffered packets sent by the server. */
1.11 markus 856: client_process_buffered_input_packets();
857:
1.16 markus 858: if (compat20 && !channel_still_open()) {
1.37 markus 859: debug2("!channel_still_open.");
1.16 markus 860: break;
861: }
862:
1.13 markus 863: /*
864: * Make packets of buffered stdin data, and buffer them for
865: * sending to the server.
866: */
1.17 markus 867: if (!compat20)
1.16 markus 868: client_make_packets_from_stdin_data();
1.11 markus 869:
1.13 markus 870: /*
871: * Make packets from buffered channel data, and buffer them
872: * for sending to the server.
873: */
1.11 markus 874: if (packet_not_very_much_data_to_write())
875: channel_output_poll();
876:
1.13 markus 877: /*
878: * Check if the window size has changed, and buffer a message
879: * about it to the server if so.
880: */
1.11 markus 881: client_check_window_change();
882:
883: if (quit_pending)
884: break;
885:
1.13 markus 886: /*
887: * Wait until we have something to do (something becomes
888: * available on one of the descriptors).
889: */
1.11 markus 890: client_wait_until_can_do_something(&readset, &writeset);
891:
892: if (quit_pending)
893: break;
894:
895: /* Do channel operations. */
896: channel_after_select(&readset, &writeset);
897:
1.17 markus 898: /* Buffer input from the connection. */
899: client_process_net_input(&readset);
900:
901: if (quit_pending)
902: break;
1.11 markus 903:
1.17 markus 904: if (!compat20) {
905: /* Buffer data from stdin */
906: client_process_input(&readset);
907: /*
908: * Process output to stdout and stderr. Output to
909: * the connection is processed elsewhere (above).
910: */
1.16 markus 911: client_process_output(&writeset);
1.17 markus 912: }
1.11 markus 913:
1.13 markus 914: /* Send as much buffered packet data as possible to the sender. */
1.11 markus 915: if (FD_ISSET(connection_out, &writeset))
916: packet_write_poll();
917: }
918:
919: /* Terminate the session. */
920:
921: /* Stop watching for window change. */
922: if (have_pty)
923: signal(SIGWINCH, SIG_DFL);
924:
925: /* Stop listening for connections. */
926: channel_stop_listening();
927:
1.13 markus 928: /*
929: * In interactive mode (with pseudo tty) display a message indicating
930: * that the connection has been closed.
931: */
1.11 markus 932: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
933: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
934: buffer_append(&stderr_buffer, buf, strlen(buf));
935: stderr_bytes += strlen(buf);
936: }
937: /* Output any buffered data for stdout. */
938: while (buffer_len(&stdout_buffer) > 0) {
939: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 940: buffer_len(&stdout_buffer));
1.11 markus 941: if (len <= 0) {
942: error("Write failed flushing stdout buffer.");
943: break;
944: }
945: buffer_consume(&stdout_buffer, len);
946: }
947:
948: /* Output any buffered data for stderr. */
949: while (buffer_len(&stderr_buffer) > 0) {
950: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 951: buffer_len(&stderr_buffer));
1.11 markus 952: if (len <= 0) {
953: error("Write failed flushing stderr buffer.");
954: break;
955: }
956: buffer_consume(&stderr_buffer, len);
957: }
958:
959: if (have_pty)
960: leave_raw_mode();
961:
962: /* Clear and free any buffers. */
963: memset(buf, 0, sizeof(buf));
964: buffer_free(&stdin_buffer);
965: buffer_free(&stdout_buffer);
966: buffer_free(&stderr_buffer);
967:
968: /* Report bytes transferred, and transfer rates. */
969: total_time = get_current_time() - start_time;
970: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
971: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
972: if (total_time > 0)
973: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
974: stdin_bytes / total_time, stdout_bytes / total_time,
975: stderr_bytes / total_time);
976:
977: /* Return the exit status of the program. */
978: debug("Exit status %d", exit_status);
979: return exit_status;
1.15 markus 980: }
981:
982: /*********/
983:
984: void
1.36 markus 985: client_input_stdout_data(int type, int plen, void *ctxt)
1.15 markus 986: {
1.42 ! markus 987: u_int data_len;
1.15 markus 988: char *data = packet_get_string(&data_len);
989: packet_integrity_check(plen, 4 + data_len, type);
990: buffer_append(&stdout_buffer, data, data_len);
991: stdout_bytes += data_len;
992: memset(data, 0, data_len);
993: xfree(data);
994: }
995: void
1.36 markus 996: client_input_stderr_data(int type, int plen, void *ctxt)
1.15 markus 997: {
1.42 ! markus 998: u_int data_len;
1.15 markus 999: char *data = packet_get_string(&data_len);
1000: packet_integrity_check(plen, 4 + data_len, type);
1001: buffer_append(&stderr_buffer, data, data_len);
1002: stdout_bytes += data_len;
1003: memset(data, 0, data_len);
1004: xfree(data);
1005: }
1006: void
1.36 markus 1007: client_input_exit_status(int type, int plen, void *ctxt)
1.15 markus 1008: {
1009: packet_integrity_check(plen, 4, type);
1010: exit_status = packet_get_int();
1011: /* Acknowledge the exit. */
1012: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1013: packet_send();
1014: /*
1015: * Must wait for packet to be sent since we are
1016: * exiting the loop.
1017: */
1018: packet_write_wait();
1019: /* Flag that we want to exit. */
1020: quit_pending = 1;
1021: }
1022:
1.40 markus 1023: Channel *
1024: client_request_forwarded_tcpip(const char *request_type, int rchan)
1025: {
1026: Channel* c = NULL;
1027: char *listen_address, *originator_address;
1028: int listen_port, originator_port;
1029: int sock, newch;
1030:
1031: /* Get rest of the packet */
1032: listen_address = packet_get_string(NULL);
1033: listen_port = packet_get_int();
1034: originator_address = packet_get_string(NULL);
1035: originator_port = packet_get_int();
1036: packet_done();
1037:
1038: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1039: listen_address, listen_port, originator_address, originator_port);
1040:
1041: sock = channel_connect_by_listen_adress(listen_port);
1042: if (sock >= 0) {
1043: newch = channel_new("forwarded-tcpip",
1.41 markus 1044: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1.40 markus 1045: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1046: xstrdup(originator_address), 1);
1047: c = channel_lookup(newch);
1048: }
1049: xfree(originator_address);
1050: xfree(listen_address);
1051: return c;
1052: }
1053:
1054: Channel*
1055: client_request_x11(const char *request_type, int rchan)
1056: {
1057: Channel *c = NULL;
1058: char *originator;
1059: int originator_port;
1060: int sock, newch;
1061:
1062: if (!options.forward_x11) {
1063: error("Warning: ssh server tried X11 forwarding.");
1064: error("Warning: this is probably a break in attempt by a malicious server.");
1065: return NULL;
1066: }
1067: originator = packet_get_string(NULL);
1068: if (datafellows & SSH_BUG_X11FWD) {
1069: debug2("buggy server: x11 request w/o originator_port");
1070: originator_port = 0;
1071: } else {
1072: originator_port = packet_get_int();
1073: }
1074: packet_done();
1075: /* XXX check permission */
1076: sock = x11_connect_display();
1077: if (sock >= 0) {
1078: newch = channel_new("x11",
1079: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1080: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
1081: xstrdup("x11"), 1);
1082: c = channel_lookup(newch);
1083: }
1084: xfree(originator);
1085: return c;
1086: }
1087:
1088: Channel*
1089: client_request_agent(const char *request_type, int rchan)
1090: {
1091: Channel *c = NULL;
1092: int sock, newch;
1093:
1094: if (!options.forward_agent) {
1095: error("Warning: ssh server tried agent forwarding.");
1096: error("Warning: this is probably a break in attempt by a malicious server.");
1097: return NULL;
1098: }
1099: sock = ssh_get_authentication_socket();
1100: if (sock >= 0) {
1101: newch = channel_new("authentication agent connection",
1102: SSH_CHANNEL_OPEN, sock, sock, -1,
1103: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1104: xstrdup("authentication agent connection"), 1);
1105: c = channel_lookup(newch);
1106: }
1107: return c;
1108: }
1109:
1.22 markus 1110: /* XXXX move to generic input handler */
1111: void
1.36 markus 1112: client_input_channel_open(int type, int plen, void *ctxt)
1.22 markus 1113: {
1114: Channel *c = NULL;
1115: char *ctype;
1.42 ! markus 1116: u_int len;
1.22 markus 1117: int rchan;
1118: int rmaxpack;
1119: int rwindow;
1120:
1121: ctype = packet_get_string(&len);
1122: rchan = packet_get_int();
1123: rwindow = packet_get_int();
1124: rmaxpack = packet_get_int();
1125:
1.24 markus 1126: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1127: ctype, rchan, rwindow, rmaxpack);
1128:
1.40 markus 1129: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1130: c = client_request_forwarded_tcpip(ctype, rchan);
1131: } else if (strcmp(ctype, "x11") == 0) {
1132: c = client_request_x11(ctype, rchan);
1133: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1134: c = client_request_agent(ctype, rchan);
1.22 markus 1135: }
1136: /* XXX duplicate : */
1137: if (c != NULL) {
1138: debug("confirm %s", ctype);
1139: c->remote_id = rchan;
1140: c->remote_window = rwindow;
1141: c->remote_maxpacket = rmaxpack;
1142:
1143: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1144: packet_put_int(c->remote_id);
1145: packet_put_int(c->self);
1146: packet_put_int(c->local_window);
1147: packet_put_int(c->local_maxpacket);
1148: packet_send();
1149: } else {
1150: debug("failure %s", ctype);
1151: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1152: packet_put_int(rchan);
1153: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1154: packet_put_cstring("bla bla");
1155: packet_put_cstring("");
1156: packet_send();
1157: }
1158: xfree(ctype);
1159: }
1160:
1.20 markus 1161: void
1.16 markus 1162: client_init_dispatch_20()
1163: {
1164: dispatch_init(&dispatch_protocol_error);
1165: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1166: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1167: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1168: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1169: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1170: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1171: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1172: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request);
1173: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1174: }
1.20 markus 1175: void
1.15 markus 1176: client_init_dispatch_13()
1177: {
1178: dispatch_init(NULL);
1179: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1180: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1181: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1182: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1183: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1184: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1185: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1186: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1187: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1188:
1189: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1190: &auth_input_open_request : &deny_input_open);
1191: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1192: &x11_input_open : &deny_input_open);
1.15 markus 1193: }
1.20 markus 1194: void
1.15 markus 1195: client_init_dispatch_15()
1196: {
1197: client_init_dispatch_13();
1198: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1199: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1200: }
1.20 markus 1201: void
1.15 markus 1202: client_init_dispatch()
1203: {
1.16 markus 1204: if (compat20)
1205: client_init_dispatch_20();
1206: else if (compat13)
1.15 markus 1207: client_init_dispatch_13();
1208: else
1209: client_init_dispatch_15();
1.16 markus 1210: }
1211:
1212: void
1213: client_input_channel_req(int id, void *arg)
1214: {
1215: Channel *c = NULL;
1.42 ! markus 1216: u_int len;
1.16 markus 1217: int success = 0;
1218: int reply;
1219: char *rtype;
1220:
1221: rtype = packet_get_string(&len);
1222: reply = packet_get_char();
1223:
1.23 markus 1224: debug("client_input_channel_req: rtype %s reply %d", rtype, reply);
1.16 markus 1225:
1226: c = channel_lookup(id);
1227: if (c == NULL)
1.35 markus 1228: fatal("client_input_channel_req: channel %d: bad channel", id);
1.16 markus 1229:
1230: if (session_ident == -1) {
1231: error("client_input_channel_req: no channel %d", id);
1232: } else if (id != session_ident) {
1233: error("client_input_channel_req: bad channel %d != %d",
1234: id, session_ident);
1235: } else if (strcmp(rtype, "exit-status") == 0) {
1236: success = 1;
1237: exit_status = packet_get_int();
1.19 markus 1238: packet_done();
1.16 markus 1239: }
1240: if (reply) {
1241: packet_start(success ?
1242: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1243: packet_put_int(c->remote_id);
1244: packet_send();
1245: }
1246: xfree(rtype);
1247: }
1248:
1249: void
1250: client_set_session_ident(int id)
1251: {
1.37 markus 1252: debug2("client_set_session_ident: id %d", id);
1.16 markus 1253: session_ident = id;
1254: channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST,
1255: client_input_channel_req, (void *)0);
1.1 deraadt 1256: }