Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.43
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"
1.43 ! markus 62: RCSID("$OpenBSD: clientloop.c,v 1.42 2000/12/19 23:17:56 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"
1.43 ! markus 82: #include "clientloop.h"
1.39 markus 83:
84: /* import options */
85: extern Options options;
86:
1.1 deraadt 87: /* Flag indicating that stdin should be redirected from /dev/null. */
88: extern int stdin_null_flag;
89:
1.13 markus 90: /*
91: * Name of the host we are connecting to. This is the name given on the
92: * command line, or the HostName specified for the user-supplied name in a
93: * configuration file.
94: */
1.1 deraadt 95: extern char *host;
96:
1.13 markus 97: /*
98: * Flag to indicate that we have received a window change signal which has
99: * not yet been processed. This will cause a message indicating the new
100: * window size to be sent to the server a little later. This is volatile
101: * because this is updated in a signal handler.
102: */
1.1 deraadt 103: static volatile int received_window_change_signal = 0;
104:
105: /* Terminal modes, as saved by enter_raw_mode. */
106: static struct termios saved_tio;
107:
1.13 markus 108: /*
109: * Flag indicating whether we are in raw mode. This is used by
110: * enter_raw_mode and leave_raw_mode.
111: */
1.1 deraadt 112: static int in_raw_mode = 0;
113:
114: /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
115: static int in_non_blocking_mode = 0;
116:
117: /* Common data for the client loop code. */
1.31 markus 118: static int quit_pending; /* Set to non-zero to quit the client loop. */
119: static int escape_char; /* Escape character. */
1.11 markus 120: static int escape_pending; /* Last character was the escape character */
121: static int last_was_cr; /* Last character was a newline. */
122: static int exit_status; /* Used to store the exit status of the command. */
123: static int stdin_eof; /* EOF has been encountered on standard error. */
124: static Buffer stdin_buffer; /* Buffer for stdin data. */
125: static Buffer stdout_buffer; /* Buffer for stdout data. */
126: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 127: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
128: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 129: static int max_fd; /* Maximum file descriptor number in select(). */
130: static int connection_in; /* Connection to server (input). */
131: static int connection_out; /* Connection to server (output). */
1.1 deraadt 132:
1.16 markus 133:
134: void client_init_dispatch(void);
135: int session_ident = -1;
136:
1.13 markus 137: /* Returns the user\'s terminal to normal mode if it had been put in raw mode. */
1.1 deraadt 138:
1.20 markus 139: void
1.11 markus 140: leave_raw_mode()
1.1 deraadt 141: {
1.11 markus 142: if (!in_raw_mode)
143: return;
144: in_raw_mode = 0;
145: if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0)
146: perror("tcsetattr");
1.1 deraadt 147:
1.11 markus 148: fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL);
1.1 deraadt 149: }
150:
151: /* Puts the user\'s terminal in raw mode. */
152:
1.20 markus 153: void
1.11 markus 154: enter_raw_mode()
1.1 deraadt 155: {
1.11 markus 156: struct termios tio;
1.1 deraadt 157:
1.11 markus 158: if (tcgetattr(fileno(stdin), &tio) < 0)
159: perror("tcgetattr");
160: saved_tio = tio;
161: tio.c_iflag |= IGNPAR;
162: tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
163: tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
1.1 deraadt 164: #ifdef IEXTEN
1.11 markus 165: tio.c_lflag &= ~IEXTEN;
166: #endif /* IEXTEN */
167: tio.c_oflag &= ~OPOST;
168: tio.c_cc[VMIN] = 1;
169: tio.c_cc[VTIME] = 0;
170: if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0)
171: perror("tcsetattr");
172: in_raw_mode = 1;
1.1 deraadt 173:
1.11 markus 174: fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL);
175: }
1.1 deraadt 176:
177: /* Restores stdin to blocking mode. */
178:
1.20 markus 179: void
1.11 markus 180: leave_non_blocking()
1.1 deraadt 181: {
1.11 markus 182: if (in_non_blocking_mode) {
183: (void) fcntl(fileno(stdin), F_SETFL, 0);
184: in_non_blocking_mode = 0;
185: fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL);
186: }
1.1 deraadt 187: }
188:
1.11 markus 189: /* Puts stdin terminal in non-blocking mode. */
190:
1.20 markus 191: void
1.11 markus 192: enter_non_blocking()
1.1 deraadt 193: {
1.11 markus 194: in_non_blocking_mode = 1;
195: (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
196: fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL);
1.1 deraadt 197: }
198:
1.13 markus 199: /*
200: * Signal handler for the window change signal (SIGWINCH). This just sets a
201: * flag indicating that the window has changed.
202: */
1.1 deraadt 203:
1.20 markus 204: void
1.11 markus 205: window_change_handler(int sig)
1.1 deraadt 206: {
1.11 markus 207: received_window_change_signal = 1;
208: signal(SIGWINCH, window_change_handler);
1.1 deraadt 209: }
210:
1.13 markus 211: /*
212: * Signal handler for signals that cause the program to terminate. These
213: * signals must be trapped to restore terminal modes.
214: */
1.1 deraadt 215:
1.20 markus 216: void
1.11 markus 217: signal_handler(int sig)
1.1 deraadt 218: {
1.11 markus 219: if (in_raw_mode)
220: leave_raw_mode();
221: if (in_non_blocking_mode)
222: leave_non_blocking();
223: channel_stop_listening();
224: packet_close();
225: fatal("Killed by signal %d.", sig);
1.1 deraadt 226: }
227:
1.13 markus 228: /*
229: * Returns current time in seconds from Jan 1, 1970 with the maximum
230: * available resolution.
231: */
1.1 deraadt 232:
1.20 markus 233: double
1.11 markus 234: get_current_time()
1.1 deraadt 235: {
1.11 markus 236: struct timeval tv;
237: gettimeofday(&tv, NULL);
238: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.1 deraadt 239: }
240:
1.13 markus 241: /*
242: * This is called when the interactive is entered. This checks if there is
243: * an EOF coming on stdin. We must check this explicitly, as select() does
244: * not appear to wake up when redirecting from /dev/null.
245: */
1.1 deraadt 246:
1.20 markus 247: void
1.11 markus 248: client_check_initial_eof_on_stdin()
1.1 deraadt 249: {
1.11 markus 250: int len;
251: char buf[1];
1.1 deraadt 252:
1.13 markus 253: /*
254: * If standard input is to be "redirected from /dev/null", we simply
255: * mark that we have seen an EOF and send an EOF message to the
256: * server. Otherwise, we try to read a single character; it appears
257: * that for some files, such /dev/null, select() never wakes up for
258: * read for this descriptor, which means that we never get EOF. This
259: * way we will get the EOF if stdin comes from /dev/null or similar.
260: */
1.11 markus 261: if (stdin_null_flag) {
262: /* Fake EOF on stdin. */
263: debug("Sending eof.");
264: stdin_eof = 1;
265: packet_start(SSH_CMSG_EOF);
266: packet_send();
267: } else {
268: enter_non_blocking();
269:
270: /* Check for immediate EOF on stdin. */
271: len = read(fileno(stdin), buf, 1);
272: if (len == 0) {
1.13 markus 273: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 274: debug("Sending eof.");
275: stdin_eof = 1;
276: packet_start(SSH_CMSG_EOF);
277: packet_send();
278: } else if (len > 0) {
1.13 markus 279: /*
280: * Got data. We must store the data in the buffer,
281: * and also process it as an escape character if
282: * appropriate.
283: */
1.42 markus 284: if ((u_char) buf[0] == escape_char)
1.11 markus 285: escape_pending = 1;
286: else {
287: buffer_append(&stdin_buffer, buf, 1);
288: stdin_bytes += 1;
289: }
290: }
291: leave_non_blocking();
292: }
1.1 deraadt 293: }
294:
295:
1.13 markus 296: /*
297: * Make packets from buffered stdin data, and buffer them for sending to the
298: * connection.
299: */
1.1 deraadt 300:
1.20 markus 301: void
1.11 markus 302: client_make_packets_from_stdin_data()
1.1 deraadt 303: {
1.42 markus 304: u_int len;
1.1 deraadt 305:
1.11 markus 306: /* Send buffered stdin data to the server. */
307: while (buffer_len(&stdin_buffer) > 0 &&
308: packet_not_very_much_data_to_write()) {
309: len = buffer_len(&stdin_buffer);
310: /* Keep the packets at reasonable size. */
311: if (len > packet_get_maxsize())
312: len = packet_get_maxsize();
313: packet_start(SSH_CMSG_STDIN_DATA);
314: packet_put_string(buffer_ptr(&stdin_buffer), len);
315: packet_send();
316: buffer_consume(&stdin_buffer, len);
317: /* If we have a pending EOF, send it now. */
318: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
319: packet_start(SSH_CMSG_EOF);
320: packet_send();
321: }
1.1 deraadt 322: }
323: }
324:
1.13 markus 325: /*
326: * Checks if the client window has changed, and sends a packet about it to
327: * the server if so. The actual change is detected elsewhere (by a software
328: * interrupt on Unix); this just checks the flag and sends a message if
329: * appropriate.
330: */
1.1 deraadt 331:
1.20 markus 332: void
1.11 markus 333: client_check_window_change()
1.1 deraadt 334: {
1.16 markus 335: struct winsize ws;
336:
337: if (! received_window_change_signal)
338: return;
339: /** XXX race */
340: received_window_change_signal = 0;
341:
342: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
343: return;
344:
1.37 markus 345: debug2("client_check_window_change: changed");
1.16 markus 346:
347: if (compat20) {
348: channel_request_start(session_ident, "window-change", 0);
349: packet_put_int(ws.ws_col);
350: packet_put_int(ws.ws_row);
351: packet_put_int(ws.ws_xpixel);
352: packet_put_int(ws.ws_ypixel);
353: packet_send();
354: } else {
355: packet_start(SSH_CMSG_WINDOW_SIZE);
356: packet_put_int(ws.ws_row);
357: packet_put_int(ws.ws_col);
358: packet_put_int(ws.ws_xpixel);
359: packet_put_int(ws.ws_ypixel);
360: packet_send();
1.1 deraadt 361: }
362: }
363:
1.13 markus 364: /*
365: * Waits until the client can do something (some data becomes available on
366: * one of the file descriptors).
367: */
1.1 deraadt 368:
1.20 markus 369: void
1.11 markus 370: client_wait_until_can_do_something(fd_set * readset, fd_set * writeset)
371: {
372: /* Initialize select masks. */
373: FD_ZERO(readset);
1.17 markus 374: FD_ZERO(writeset);
1.11 markus 375:
1.16 markus 376: if (!compat20) {
1.17 markus 377: /* Read from the connection, unless our buffers are full. */
1.16 markus 378: if (buffer_len(&stdout_buffer) < buffer_high &&
379: buffer_len(&stderr_buffer) < buffer_high &&
380: channel_not_very_much_buffered_data())
381: FD_SET(connection_in, readset);
1.17 markus 382: /*
383: * Read from stdin, unless we have seen EOF or have very much
384: * buffered data to send to the server.
385: */
386: if (!stdin_eof && packet_not_very_much_data_to_write())
387: FD_SET(fileno(stdin), readset);
388:
389: /* Select stdout/stderr if have data in buffer. */
390: if (buffer_len(&stdout_buffer) > 0)
391: FD_SET(fileno(stdout), writeset);
392: if (buffer_len(&stderr_buffer) > 0)
393: FD_SET(fileno(stderr), writeset);
1.16 markus 394: } else {
1.11 markus 395: FD_SET(connection_in, readset);
1.16 markus 396: }
1.11 markus 397:
398: /* Add any selections by the channel mechanism. */
399: channel_prepare_select(readset, writeset);
400:
401: /* Select server connection if have data to write to the server. */
402: if (packet_have_data_to_write())
403: FD_SET(connection_out, writeset);
404:
1.16 markus 405: /* move UP XXX */
1.11 markus 406: /* Update maximum file descriptor number, if appropriate. */
407: if (channel_max_fd() > max_fd)
408: max_fd = channel_max_fd();
409:
1.13 markus 410: /*
411: * Wait for something to happen. This will suspend the process until
412: * some selected descriptor can be read, written, or has some other
413: * event pending. Note: if you want to implement SSH_MSG_IGNORE
414: * messages to fool traffic analysis, this might be the place to do
415: * it: just have a random timeout for the select, and send a random
416: * SSH_MSG_IGNORE packet when the timeout expires.
417: */
1.11 markus 418:
419: if (select(max_fd + 1, readset, writeset, NULL, NULL) < 0) {
420: char buf[100];
421: /* Some systems fail to clear these automatically. */
422: FD_ZERO(readset);
423: FD_ZERO(writeset);
424: if (errno == EINTR)
425: return;
426: /* Note: we might still have data in the buffers. */
427: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
428: buffer_append(&stderr_buffer, buf, strlen(buf));
429: stderr_bytes += strlen(buf);
430: quit_pending = 1;
431: }
432: }
433:
1.20 markus 434: void
1.31 markus 435: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 436: {
1.11 markus 437: struct winsize oldws, newws;
438:
439: /* Flush stdout and stderr buffers. */
1.31 markus 440: if (buffer_len(bout) > 0)
441: atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
442: if (buffer_len(berr) > 0)
443: atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 444:
445: leave_raw_mode();
446:
1.13 markus 447: /*
448: * Free (and clear) the buffer to reduce the amount of data that gets
449: * written to swap.
450: */
1.31 markus 451: buffer_free(bin);
452: buffer_free(bout);
453: buffer_free(berr);
1.11 markus 454:
455: /* Save old window size. */
456: ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
457:
458: /* Send the suspend signal to the program itself. */
459: kill(getpid(), SIGTSTP);
460:
461: /* Check if the window size has changed. */
462: if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
463: (oldws.ws_row != newws.ws_row ||
464: oldws.ws_col != newws.ws_col ||
465: oldws.ws_xpixel != newws.ws_xpixel ||
466: oldws.ws_ypixel != newws.ws_ypixel))
467: received_window_change_signal = 1;
468:
469: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 470: buffer_init(bin);
471: buffer_init(bout);
472: buffer_init(berr);
1.11 markus 473:
474: enter_raw_mode();
475: }
476:
1.20 markus 477: void
1.17 markus 478: client_process_net_input(fd_set * readset)
1.11 markus 479: {
1.17 markus 480: int len;
481: char buf[8192];
1.11 markus 482:
1.13 markus 483: /*
484: * Read input from the server, and add any such data to the buffer of
485: * the packet subsystem.
486: */
1.11 markus 487: if (FD_ISSET(connection_in, readset)) {
488: /* Read as much as possible. */
489: len = read(connection_in, buf, sizeof(buf));
490: if (len == 0) {
491: /* Received EOF. The remote host has closed the connection. */
492: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
493: host);
1.1 deraadt 494: buffer_append(&stderr_buffer, buf, strlen(buf));
495: stderr_bytes += strlen(buf);
496: quit_pending = 1;
497: return;
1.11 markus 498: }
1.13 markus 499: /*
500: * There is a kernel bug on Solaris that causes select to
501: * sometimes wake up even though there is no data available.
502: */
1.11 markus 503: if (len < 0 && errno == EAGAIN)
504: len = 0;
505:
506: if (len < 0) {
507: /* An error has encountered. Perhaps there is a network problem. */
508: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
509: host, strerror(errno));
510: buffer_append(&stderr_buffer, buf, strlen(buf));
511: stderr_bytes += strlen(buf);
512: quit_pending = 1;
513: return;
514: }
515: packet_process_incoming(buf, len);
516: }
1.17 markus 517: }
1.16 markus 518:
1.31 markus 519: /* process the characters one by one */
520: int
521: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
522: {
1.32 markus 523: char string[1024];
1.31 markus 524: pid_t pid;
525: int bytes = 0;
1.42 markus 526: u_int i;
527: u_char ch;
1.31 markus 528: char *s;
529:
530: for (i = 0; i < len; i++) {
531: /* Get one character at a time. */
532: ch = buf[i];
533:
534: if (escape_pending) {
535: /* We have previously seen an escape character. */
536: /* Clear the flag now. */
537: escape_pending = 0;
538:
539: /* Process the escaped character. */
540: switch (ch) {
541: case '.':
542: /* Terminate the connection. */
1.32 markus 543: snprintf(string, sizeof string, "%c.\r\n", escape_char);
544: buffer_append(berr, string, strlen(string));
545: /*stderr_bytes += strlen(string); XXX*/
1.31 markus 546:
547: quit_pending = 1;
548: return -1;
549:
550: case 'Z' - 64:
551: /* Suspend the program. */
552: /* Print a message to that effect to the user. */
1.32 markus 553: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
554: buffer_append(berr, string, strlen(string));
555: /*stderr_bytes += strlen(string); XXX*/
1.31 markus 556:
557: /* Restore terminal modes and suspend. */
558: client_suspend_self(bin, bout, berr);
559:
560: /* We have been continued. */
561: continue;
562:
563: case '&':
564: /* XXX does not work yet with proto 2 */
565: if (compat20)
566: continue;
567: /*
568: * Detach the program (continue to serve connections,
569: * but put in background and no more new connections).
570: */
571: if (!stdin_eof) {
572: /*
573: * Sending SSH_CMSG_EOF alone does not always appear
574: * to be enough. So we try to send an EOF character
575: * first.
576: */
577: packet_start(SSH_CMSG_STDIN_DATA);
578: packet_put_string("\004", 1);
579: packet_send();
580: /* Close stdin. */
581: stdin_eof = 1;
582: if (buffer_len(bin) == 0) {
583: packet_start(SSH_CMSG_EOF);
584: packet_send();
585: }
586: }
587: /* Restore tty modes. */
588: leave_raw_mode();
589:
590: /* Stop listening for new connections. */
591: channel_stop_listening();
592:
593: printf("%c& [backgrounded]\n", escape_char);
594:
595: /* Fork into background. */
596: pid = fork();
597: if (pid < 0) {
598: error("fork: %.100s", strerror(errno));
599: continue;
600: }
601: if (pid != 0) { /* This is the parent. */
602: /* The parent just exits. */
603: exit(0);
604: }
605: /* The child continues serving connections. */
606: continue; /*XXX ? */
607:
608: case '?':
1.32 markus 609: snprintf(string, sizeof string,
1.31 markus 610: "%c?\r\n\
611: Supported escape sequences:\r\n\
612: ~. - terminate connection\r\n\
613: ~^Z - suspend ssh\r\n\
614: ~# - list forwarded connections\r\n\
615: ~& - background ssh (when waiting for connections to terminate)\r\n\
616: ~? - this message\r\n\
617: ~~ - send the escape character by typing it twice\r\n\
618: (Note that escapes are only recognized immediately after newline.)\r\n",
619: escape_char);
1.32 markus 620: buffer_append(berr, string, strlen(string));
1.31 markus 621: continue;
622:
623: case '#':
1.32 markus 624: snprintf(string, sizeof string, "%c#\r\n", escape_char);
625: buffer_append(berr, string, strlen(string));
1.31 markus 626: s = channel_open_message();
627: buffer_append(berr, s, strlen(s));
628: xfree(s);
629: continue;
630:
631: default:
632: if (ch != escape_char) {
633: buffer_put_char(bin, escape_char);
634: bytes++;
635: }
636: /* Escaped characters fall through here */
637: break;
638: }
639: } else {
640: /*
641: * The previous character was not an escape char. Check if this
642: * is an escape.
643: */
644: if (last_was_cr && ch == escape_char) {
645: /* It is. Set the flag and continue to next character. */
646: escape_pending = 1;
647: continue;
648: }
649: }
650:
651: /*
652: * Normal character. Record whether it was a newline,
653: * and append it to the buffer.
654: */
655: last_was_cr = (ch == '\r' || ch == '\n');
656: buffer_put_char(bin, ch);
657: bytes++;
658: }
659: return bytes;
660: }
661:
1.20 markus 662: void
1.17 markus 663: client_process_input(fd_set * readset)
664: {
1.31 markus 665: int ret;
1.21 deraadt 666: int len;
1.31 markus 667: char buf[8192];
1.16 markus 668:
1.11 markus 669: /* Read input from stdin. */
670: if (FD_ISSET(fileno(stdin), readset)) {
671: /* Read as much as possible. */
672: len = read(fileno(stdin), buf, sizeof(buf));
673: if (len <= 0) {
1.13 markus 674: /*
675: * Received EOF or error. They are treated
676: * similarly, except that an error message is printed
677: * if it was an error condition.
678: */
1.11 markus 679: if (len < 0) {
680: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
681: buffer_append(&stderr_buffer, buf, strlen(buf));
682: stderr_bytes += strlen(buf);
683: }
684: /* Mark that we have seen EOF. */
685: stdin_eof = 1;
1.13 markus 686: /*
687: * Send an EOF message to the server unless there is
688: * data in the buffer. If there is data in the
689: * buffer, no message will be sent now. Code
690: * elsewhere will send the EOF when the buffer
691: * becomes empty if stdin_eof is set.
692: */
1.11 markus 693: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 694: packet_start(SSH_CMSG_EOF);
695: packet_send();
1.11 markus 696: }
697: } else if (escape_char == -1) {
1.13 markus 698: /*
699: * Normal successful read, and no escape character.
700: * Just append the data to buffer.
701: */
1.11 markus 702: buffer_append(&stdin_buffer, buf, len);
703: stdin_bytes += len;
704: } else {
1.13 markus 705: /*
706: * Normal, successful read. But we have an escape character
707: * and have to process the characters one by one.
708: */
1.31 markus 709: ret = process_escapes(&stdin_buffer, &stdout_buffer, &stderr_buffer, buf, len);
710: if (ret == -1)
711: return;
712: stdout_bytes += ret;
1.11 markus 713: }
714: }
715: }
716:
1.20 markus 717: void
1.11 markus 718: client_process_output(fd_set * writeset)
719: {
720: int len;
721: char buf[100];
1.1 deraadt 722:
1.11 markus 723: /* Write buffered output to stdout. */
724: if (FD_ISSET(fileno(stdout), writeset)) {
725: /* Write as much data as possible. */
726: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 727: buffer_len(&stdout_buffer));
1.11 markus 728: if (len <= 0) {
729: if (errno == EAGAIN)
730: len = 0;
731: else {
1.13 markus 732: /*
733: * An error or EOF was encountered. Put an
734: * error message to stderr buffer.
735: */
1.11 markus 736: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
737: buffer_append(&stderr_buffer, buf, strlen(buf));
738: stderr_bytes += strlen(buf);
739: quit_pending = 1;
740: return;
741: }
742: }
743: /* Consume printed data from the buffer. */
744: buffer_consume(&stdout_buffer, len);
745: }
746: /* Write buffered output to stderr. */
747: if (FD_ISSET(fileno(stderr), writeset)) {
748: /* Write as much data as possible. */
749: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 750: buffer_len(&stderr_buffer));
1.11 markus 751: if (len <= 0) {
752: if (errno == EAGAIN)
753: len = 0;
754: else {
1.13 markus 755: /* EOF or error, but can't even print error message. */
1.11 markus 756: quit_pending = 1;
757: return;
758: }
759: }
760: /* Consume printed characters from the buffer. */
761: buffer_consume(&stderr_buffer, len);
762: }
1.1 deraadt 763: }
764:
1.13 markus 765: /*
1.15 markus 766: * Get packets from the connection input buffer, and process them as long as
767: * there are packets available.
768: *
769: * Any unknown packets received during the actual
770: * session cause the session to terminate. This is
771: * intended to make debugging easier since no
772: * confirmations are sent. Any compatible protocol
773: * extensions must be negotiated during the
774: * preparatory phase.
775: */
776:
1.20 markus 777: void
1.15 markus 778: client_process_buffered_input_packets()
779: {
1.36 markus 780: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL);
1.15 markus 781: }
782:
1.31 markus 783: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 784:
785: int
1.31 markus 786: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 787: {
1.31 markus 788: /* XXX we assume c->extended is writeable */
789: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 790: }
791:
1.15 markus 792: /*
1.13 markus 793: * Implements the interactive session with the server. This is called after
794: * the user has been authenticated, and a command has been started on the
795: * remote host. If escape_char != -1, it is the character used as an escape
796: * character for terminating or suspending the session.
797: */
1.1 deraadt 798:
1.20 markus 799: int
1.30 markus 800: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 801: {
1.11 markus 802: double start_time, total_time;
803: int len;
804: char buf[100];
805:
806: debug("Entering interactive session.");
807:
808: start_time = get_current_time();
809:
810: /* Initialize variables. */
811: escape_pending = 0;
812: last_was_cr = 1;
813: exit_status = -1;
814: stdin_eof = 0;
815: buffer_high = 64 * 1024;
816: connection_in = packet_get_connection_in();
817: connection_out = packet_get_connection_out();
818: max_fd = connection_in;
819: if (connection_out > max_fd)
820: max_fd = connection_out;
821: stdin_bytes = 0;
822: stdout_bytes = 0;
823: stderr_bytes = 0;
824: quit_pending = 0;
825: escape_char = escape_char_arg;
826:
827: /* Initialize buffers. */
828: buffer_init(&stdin_buffer);
829: buffer_init(&stdout_buffer);
830: buffer_init(&stderr_buffer);
831:
1.15 markus 832: client_init_dispatch();
833:
1.11 markus 834: /* Set signal handlers to restore non-blocking mode. */
835: signal(SIGINT, signal_handler);
836: signal(SIGQUIT, signal_handler);
837: signal(SIGTERM, signal_handler);
838: signal(SIGPIPE, SIG_IGN);
839: if (have_pty)
840: signal(SIGWINCH, window_change_handler);
841:
842: if (have_pty)
843: enter_raw_mode();
844:
1.28 provos 845: /* Check if we should immediately send eof on stdin. */
1.17 markus 846: if (!compat20)
1.16 markus 847: client_check_initial_eof_on_stdin();
1.11 markus 848:
1.30 markus 849: if (compat20 && escape_char != -1)
850: channel_register_filter(ssh2_chan_id, simple_escape_filter);
851:
1.11 markus 852: /* Main loop of the client for the interactive session mode. */
853: while (!quit_pending) {
854: fd_set readset, writeset;
855:
1.13 markus 856: /* Process buffered packets sent by the server. */
1.11 markus 857: client_process_buffered_input_packets();
858:
1.16 markus 859: if (compat20 && !channel_still_open()) {
1.37 markus 860: debug2("!channel_still_open.");
1.16 markus 861: break;
862: }
863:
1.13 markus 864: /*
865: * Make packets of buffered stdin data, and buffer them for
866: * sending to the server.
867: */
1.17 markus 868: if (!compat20)
1.16 markus 869: client_make_packets_from_stdin_data();
1.11 markus 870:
1.13 markus 871: /*
872: * Make packets from buffered channel data, and buffer them
873: * for sending to the server.
874: */
1.11 markus 875: if (packet_not_very_much_data_to_write())
876: channel_output_poll();
877:
1.13 markus 878: /*
879: * Check if the window size has changed, and buffer a message
880: * about it to the server if so.
881: */
1.11 markus 882: client_check_window_change();
883:
884: if (quit_pending)
885: break;
886:
1.13 markus 887: /*
888: * Wait until we have something to do (something becomes
889: * available on one of the descriptors).
890: */
1.11 markus 891: client_wait_until_can_do_something(&readset, &writeset);
892:
893: if (quit_pending)
894: break;
895:
896: /* Do channel operations. */
897: channel_after_select(&readset, &writeset);
898:
1.17 markus 899: /* Buffer input from the connection. */
900: client_process_net_input(&readset);
901:
902: if (quit_pending)
903: break;
1.11 markus 904:
1.17 markus 905: if (!compat20) {
906: /* Buffer data from stdin */
907: client_process_input(&readset);
908: /*
909: * Process output to stdout and stderr. Output to
910: * the connection is processed elsewhere (above).
911: */
1.16 markus 912: client_process_output(&writeset);
1.17 markus 913: }
1.11 markus 914:
1.13 markus 915: /* Send as much buffered packet data as possible to the sender. */
1.11 markus 916: if (FD_ISSET(connection_out, &writeset))
917: packet_write_poll();
918: }
919:
920: /* Terminate the session. */
921:
922: /* Stop watching for window change. */
923: if (have_pty)
924: signal(SIGWINCH, SIG_DFL);
925:
926: /* Stop listening for connections. */
927: channel_stop_listening();
928:
1.13 markus 929: /*
930: * In interactive mode (with pseudo tty) display a message indicating
931: * that the connection has been closed.
932: */
1.11 markus 933: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
934: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
935: buffer_append(&stderr_buffer, buf, strlen(buf));
936: stderr_bytes += strlen(buf);
937: }
938: /* Output any buffered data for stdout. */
939: while (buffer_len(&stdout_buffer) > 0) {
940: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 941: buffer_len(&stdout_buffer));
1.11 markus 942: if (len <= 0) {
943: error("Write failed flushing stdout buffer.");
944: break;
945: }
946: buffer_consume(&stdout_buffer, len);
947: }
948:
949: /* Output any buffered data for stderr. */
950: while (buffer_len(&stderr_buffer) > 0) {
951: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 952: buffer_len(&stderr_buffer));
1.11 markus 953: if (len <= 0) {
954: error("Write failed flushing stderr buffer.");
955: break;
956: }
957: buffer_consume(&stderr_buffer, len);
958: }
959:
960: if (have_pty)
961: leave_raw_mode();
962:
963: /* Clear and free any buffers. */
964: memset(buf, 0, sizeof(buf));
965: buffer_free(&stdin_buffer);
966: buffer_free(&stdout_buffer);
967: buffer_free(&stderr_buffer);
968:
969: /* Report bytes transferred, and transfer rates. */
970: total_time = get_current_time() - start_time;
971: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
972: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
973: if (total_time > 0)
974: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
975: stdin_bytes / total_time, stdout_bytes / total_time,
976: stderr_bytes / total_time);
977:
978: /* Return the exit status of the program. */
979: debug("Exit status %d", exit_status);
980: return exit_status;
1.15 markus 981: }
982:
983: /*********/
984:
985: void
1.36 markus 986: client_input_stdout_data(int type, int plen, void *ctxt)
1.15 markus 987: {
1.42 markus 988: u_int data_len;
1.15 markus 989: char *data = packet_get_string(&data_len);
990: packet_integrity_check(plen, 4 + data_len, type);
991: buffer_append(&stdout_buffer, data, data_len);
992: stdout_bytes += data_len;
993: memset(data, 0, data_len);
994: xfree(data);
995: }
996: void
1.36 markus 997: client_input_stderr_data(int type, int plen, void *ctxt)
1.15 markus 998: {
1.42 markus 999: u_int data_len;
1.15 markus 1000: char *data = packet_get_string(&data_len);
1001: packet_integrity_check(plen, 4 + data_len, type);
1002: buffer_append(&stderr_buffer, data, data_len);
1003: stdout_bytes += data_len;
1004: memset(data, 0, data_len);
1005: xfree(data);
1006: }
1007: void
1.36 markus 1008: client_input_exit_status(int type, int plen, void *ctxt)
1.15 markus 1009: {
1010: packet_integrity_check(plen, 4, type);
1011: exit_status = packet_get_int();
1012: /* Acknowledge the exit. */
1013: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1014: packet_send();
1015: /*
1016: * Must wait for packet to be sent since we are
1017: * exiting the loop.
1018: */
1019: packet_write_wait();
1020: /* Flag that we want to exit. */
1021: quit_pending = 1;
1022: }
1023:
1.40 markus 1024: Channel *
1025: client_request_forwarded_tcpip(const char *request_type, int rchan)
1026: {
1027: Channel* c = NULL;
1028: char *listen_address, *originator_address;
1029: int listen_port, originator_port;
1030: int sock, newch;
1031:
1032: /* Get rest of the packet */
1033: listen_address = packet_get_string(NULL);
1034: listen_port = packet_get_int();
1035: originator_address = packet_get_string(NULL);
1036: originator_port = packet_get_int();
1037: packet_done();
1038:
1039: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1040: listen_address, listen_port, originator_address, originator_port);
1041:
1042: sock = channel_connect_by_listen_adress(listen_port);
1043: if (sock >= 0) {
1044: newch = channel_new("forwarded-tcpip",
1.41 markus 1045: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1.40 markus 1046: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1047: xstrdup(originator_address), 1);
1048: c = channel_lookup(newch);
1049: }
1050: xfree(originator_address);
1051: xfree(listen_address);
1052: return c;
1053: }
1054:
1055: Channel*
1056: client_request_x11(const char *request_type, int rchan)
1057: {
1058: Channel *c = NULL;
1059: char *originator;
1060: int originator_port;
1061: int sock, newch;
1062:
1063: if (!options.forward_x11) {
1064: error("Warning: ssh server tried X11 forwarding.");
1065: error("Warning: this is probably a break in attempt by a malicious server.");
1066: return NULL;
1067: }
1068: originator = packet_get_string(NULL);
1069: if (datafellows & SSH_BUG_X11FWD) {
1070: debug2("buggy server: x11 request w/o originator_port");
1071: originator_port = 0;
1072: } else {
1073: originator_port = packet_get_int();
1074: }
1075: packet_done();
1076: /* XXX check permission */
1077: sock = x11_connect_display();
1078: if (sock >= 0) {
1079: newch = channel_new("x11",
1080: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1081: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
1082: xstrdup("x11"), 1);
1083: c = channel_lookup(newch);
1084: }
1085: xfree(originator);
1086: return c;
1087: }
1088:
1089: Channel*
1090: client_request_agent(const char *request_type, int rchan)
1091: {
1092: Channel *c = NULL;
1093: int sock, newch;
1094:
1095: if (!options.forward_agent) {
1096: error("Warning: ssh server tried agent forwarding.");
1097: error("Warning: this is probably a break in attempt by a malicious server.");
1098: return NULL;
1099: }
1100: sock = ssh_get_authentication_socket();
1101: if (sock >= 0) {
1102: newch = channel_new("authentication agent connection",
1103: SSH_CHANNEL_OPEN, sock, sock, -1,
1104: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1105: xstrdup("authentication agent connection"), 1);
1106: c = channel_lookup(newch);
1107: }
1108: return c;
1109: }
1110:
1.22 markus 1111: /* XXXX move to generic input handler */
1112: void
1.36 markus 1113: client_input_channel_open(int type, int plen, void *ctxt)
1.22 markus 1114: {
1115: Channel *c = NULL;
1116: char *ctype;
1.42 markus 1117: u_int len;
1.22 markus 1118: int rchan;
1119: int rmaxpack;
1120: int rwindow;
1121:
1122: ctype = packet_get_string(&len);
1123: rchan = packet_get_int();
1124: rwindow = packet_get_int();
1125: rmaxpack = packet_get_int();
1126:
1.24 markus 1127: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1128: ctype, rchan, rwindow, rmaxpack);
1129:
1.40 markus 1130: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1131: c = client_request_forwarded_tcpip(ctype, rchan);
1132: } else if (strcmp(ctype, "x11") == 0) {
1133: c = client_request_x11(ctype, rchan);
1134: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1135: c = client_request_agent(ctype, rchan);
1.22 markus 1136: }
1137: /* XXX duplicate : */
1138: if (c != NULL) {
1139: debug("confirm %s", ctype);
1140: c->remote_id = rchan;
1141: c->remote_window = rwindow;
1142: c->remote_maxpacket = rmaxpack;
1143:
1144: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1145: packet_put_int(c->remote_id);
1146: packet_put_int(c->self);
1147: packet_put_int(c->local_window);
1148: packet_put_int(c->local_maxpacket);
1149: packet_send();
1150: } else {
1151: debug("failure %s", ctype);
1152: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1153: packet_put_int(rchan);
1154: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1155: packet_put_cstring("bla bla");
1156: packet_put_cstring("");
1157: packet_send();
1158: }
1159: xfree(ctype);
1160: }
1161:
1.20 markus 1162: void
1.16 markus 1163: client_init_dispatch_20()
1164: {
1165: dispatch_init(&dispatch_protocol_error);
1166: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1167: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1168: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1169: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1170: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1171: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1172: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1173: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request);
1174: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1175: }
1.20 markus 1176: void
1.15 markus 1177: client_init_dispatch_13()
1178: {
1179: dispatch_init(NULL);
1180: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1181: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1182: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1183: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1184: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1185: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1186: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1187: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1188: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1189:
1190: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1191: &auth_input_open_request : &deny_input_open);
1192: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1193: &x11_input_open : &deny_input_open);
1.15 markus 1194: }
1.20 markus 1195: void
1.15 markus 1196: client_init_dispatch_15()
1197: {
1198: client_init_dispatch_13();
1199: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1200: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1201: }
1.20 markus 1202: void
1.15 markus 1203: client_init_dispatch()
1204: {
1.16 markus 1205: if (compat20)
1206: client_init_dispatch_20();
1207: else if (compat13)
1.15 markus 1208: client_init_dispatch_13();
1209: else
1210: client_init_dispatch_15();
1.16 markus 1211: }
1212:
1213: void
1214: client_input_channel_req(int id, void *arg)
1215: {
1216: Channel *c = NULL;
1.42 markus 1217: u_int len;
1.16 markus 1218: int success = 0;
1219: int reply;
1220: char *rtype;
1221:
1222: rtype = packet_get_string(&len);
1223: reply = packet_get_char();
1224:
1.23 markus 1225: debug("client_input_channel_req: rtype %s reply %d", rtype, reply);
1.16 markus 1226:
1227: c = channel_lookup(id);
1228: if (c == NULL)
1.35 markus 1229: fatal("client_input_channel_req: channel %d: bad channel", id);
1.16 markus 1230:
1231: if (session_ident == -1) {
1232: error("client_input_channel_req: no channel %d", id);
1233: } else if (id != session_ident) {
1234: error("client_input_channel_req: bad channel %d != %d",
1235: id, session_ident);
1236: } else if (strcmp(rtype, "exit-status") == 0) {
1237: success = 1;
1238: exit_status = packet_get_int();
1.19 markus 1239: packet_done();
1.16 markus 1240: }
1241: if (reply) {
1242: packet_start(success ?
1243: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1244: packet_put_int(c->remote_id);
1245: packet_send();
1246: }
1247: xfree(rtype);
1248: }
1249:
1250: void
1.43 ! markus 1251: clientloop_set_session_ident(int id)
1.16 markus 1252: {
1.43 ! markus 1253: debug2("clientloop_set_session_ident: id %d", id);
1.16 markus 1254: session_ident = id;
1255: channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST,
1256: client_input_channel_req, (void *)0);
1.1 deraadt 1257: }
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