Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.44
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"
1.44 ! markus 62: RCSID("$OpenBSD: clientloop.c,v 1.43 2001/01/13 19:14:08 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:
1.44 ! markus 70: #include "ssh1.h"
1.16 markus 71: #include "ssh2.h"
1.15 markus 72: #include "compat.h"
73: #include "channels.h"
74: #include "dispatch.h"
75:
1.30 markus 76: #include "buffer.h"
77: #include "bufaux.h"
78:
1.40 markus 79: #include <openssl/dsa.h>
80: #include <openssl/rsa.h>
81: #include "key.h"
82: #include "authfd.h"
1.43 markus 83: #include "clientloop.h"
1.39 markus 84:
85: /* import options */
86: extern Options options;
87:
1.1 deraadt 88: /* Flag indicating that stdin should be redirected from /dev/null. */
89: extern int stdin_null_flag;
90:
1.13 markus 91: /*
92: * Name of the host we are connecting to. This is the name given on the
93: * command line, or the HostName specified for the user-supplied name in a
94: * configuration file.
95: */
1.1 deraadt 96: extern char *host;
97:
1.13 markus 98: /*
99: * Flag to indicate that we have received a window change signal which has
100: * not yet been processed. This will cause a message indicating the new
101: * window size to be sent to the server a little later. This is volatile
102: * because this is updated in a signal handler.
103: */
1.1 deraadt 104: static volatile int received_window_change_signal = 0;
105:
106: /* Terminal modes, as saved by enter_raw_mode. */
107: static struct termios saved_tio;
108:
1.13 markus 109: /*
110: * Flag indicating whether we are in raw mode. This is used by
111: * enter_raw_mode and leave_raw_mode.
112: */
1.1 deraadt 113: static int in_raw_mode = 0;
114:
115: /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
116: static int in_non_blocking_mode = 0;
117:
118: /* Common data for the client loop code. */
1.31 markus 119: static int quit_pending; /* Set to non-zero to quit the client loop. */
120: static int escape_char; /* Escape character. */
1.11 markus 121: static int escape_pending; /* Last character was the escape character */
122: static int last_was_cr; /* Last character was a newline. */
123: static int exit_status; /* Used to store the exit status of the command. */
124: static int stdin_eof; /* EOF has been encountered on standard error. */
125: static Buffer stdin_buffer; /* Buffer for stdin data. */
126: static Buffer stdout_buffer; /* Buffer for stdout data. */
127: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 128: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
129: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 130: static int max_fd; /* Maximum file descriptor number in select(). */
131: static int connection_in; /* Connection to server (input). */
132: static int connection_out; /* Connection to server (output). */
1.1 deraadt 133:
1.16 markus 134:
135: void client_init_dispatch(void);
136: int session_ident = -1;
137:
1.13 markus 138: /* Returns the user\'s terminal to normal mode if it had been put in raw mode. */
1.1 deraadt 139:
1.20 markus 140: void
1.11 markus 141: leave_raw_mode()
1.1 deraadt 142: {
1.11 markus 143: if (!in_raw_mode)
144: return;
145: in_raw_mode = 0;
146: if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0)
147: perror("tcsetattr");
1.1 deraadt 148:
1.11 markus 149: fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL);
1.1 deraadt 150: }
151:
152: /* Puts the user\'s terminal in raw mode. */
153:
1.20 markus 154: void
1.11 markus 155: enter_raw_mode()
1.1 deraadt 156: {
1.11 markus 157: struct termios tio;
1.1 deraadt 158:
1.11 markus 159: if (tcgetattr(fileno(stdin), &tio) < 0)
160: perror("tcgetattr");
161: saved_tio = tio;
162: tio.c_iflag |= IGNPAR;
163: tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
164: tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
1.1 deraadt 165: #ifdef IEXTEN
1.11 markus 166: tio.c_lflag &= ~IEXTEN;
167: #endif /* IEXTEN */
168: tio.c_oflag &= ~OPOST;
169: tio.c_cc[VMIN] = 1;
170: tio.c_cc[VTIME] = 0;
171: if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0)
172: perror("tcsetattr");
173: in_raw_mode = 1;
1.1 deraadt 174:
1.11 markus 175: fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL);
176: }
1.1 deraadt 177:
178: /* Restores stdin to blocking mode. */
179:
1.20 markus 180: void
1.11 markus 181: leave_non_blocking()
1.1 deraadt 182: {
1.11 markus 183: if (in_non_blocking_mode) {
184: (void) fcntl(fileno(stdin), F_SETFL, 0);
185: in_non_blocking_mode = 0;
186: fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL);
187: }
1.1 deraadt 188: }
189:
1.11 markus 190: /* Puts stdin terminal in non-blocking mode. */
191:
1.20 markus 192: void
1.11 markus 193: enter_non_blocking()
1.1 deraadt 194: {
1.11 markus 195: in_non_blocking_mode = 1;
196: (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
197: fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL);
1.1 deraadt 198: }
199:
1.13 markus 200: /*
201: * Signal handler for the window change signal (SIGWINCH). This just sets a
202: * flag indicating that the window has changed.
203: */
1.1 deraadt 204:
1.20 markus 205: void
1.11 markus 206: window_change_handler(int sig)
1.1 deraadt 207: {
1.11 markus 208: received_window_change_signal = 1;
209: signal(SIGWINCH, window_change_handler);
1.1 deraadt 210: }
211:
1.13 markus 212: /*
213: * Signal handler for signals that cause the program to terminate. These
214: * signals must be trapped to restore terminal modes.
215: */
1.1 deraadt 216:
1.20 markus 217: void
1.11 markus 218: signal_handler(int sig)
1.1 deraadt 219: {
1.11 markus 220: if (in_raw_mode)
221: leave_raw_mode();
222: if (in_non_blocking_mode)
223: leave_non_blocking();
224: channel_stop_listening();
225: packet_close();
226: fatal("Killed by signal %d.", sig);
1.1 deraadt 227: }
228:
1.13 markus 229: /*
230: * Returns current time in seconds from Jan 1, 1970 with the maximum
231: * available resolution.
232: */
1.1 deraadt 233:
1.20 markus 234: double
1.11 markus 235: get_current_time()
1.1 deraadt 236: {
1.11 markus 237: struct timeval tv;
238: gettimeofday(&tv, NULL);
239: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.1 deraadt 240: }
241:
1.13 markus 242: /*
243: * This is called when the interactive is entered. This checks if there is
244: * an EOF coming on stdin. We must check this explicitly, as select() does
245: * not appear to wake up when redirecting from /dev/null.
246: */
1.1 deraadt 247:
1.20 markus 248: void
1.11 markus 249: client_check_initial_eof_on_stdin()
1.1 deraadt 250: {
1.11 markus 251: int len;
252: char buf[1];
1.1 deraadt 253:
1.13 markus 254: /*
255: * If standard input is to be "redirected from /dev/null", we simply
256: * mark that we have seen an EOF and send an EOF message to the
257: * server. Otherwise, we try to read a single character; it appears
258: * that for some files, such /dev/null, select() never wakes up for
259: * read for this descriptor, which means that we never get EOF. This
260: * way we will get the EOF if stdin comes from /dev/null or similar.
261: */
1.11 markus 262: if (stdin_null_flag) {
263: /* Fake EOF on stdin. */
264: debug("Sending eof.");
265: stdin_eof = 1;
266: packet_start(SSH_CMSG_EOF);
267: packet_send();
268: } else {
269: enter_non_blocking();
270:
271: /* Check for immediate EOF on stdin. */
272: len = read(fileno(stdin), buf, 1);
273: if (len == 0) {
1.13 markus 274: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 275: debug("Sending eof.");
276: stdin_eof = 1;
277: packet_start(SSH_CMSG_EOF);
278: packet_send();
279: } else if (len > 0) {
1.13 markus 280: /*
281: * Got data. We must store the data in the buffer,
282: * and also process it as an escape character if
283: * appropriate.
284: */
1.42 markus 285: if ((u_char) buf[0] == escape_char)
1.11 markus 286: escape_pending = 1;
287: else {
288: buffer_append(&stdin_buffer, buf, 1);
289: stdin_bytes += 1;
290: }
291: }
292: leave_non_blocking();
293: }
1.1 deraadt 294: }
295:
296:
1.13 markus 297: /*
298: * Make packets from buffered stdin data, and buffer them for sending to the
299: * connection.
300: */
1.1 deraadt 301:
1.20 markus 302: void
1.11 markus 303: client_make_packets_from_stdin_data()
1.1 deraadt 304: {
1.42 markus 305: u_int len;
1.1 deraadt 306:
1.11 markus 307: /* Send buffered stdin data to the server. */
308: while (buffer_len(&stdin_buffer) > 0 &&
309: packet_not_very_much_data_to_write()) {
310: len = buffer_len(&stdin_buffer);
311: /* Keep the packets at reasonable size. */
312: if (len > packet_get_maxsize())
313: len = packet_get_maxsize();
314: packet_start(SSH_CMSG_STDIN_DATA);
315: packet_put_string(buffer_ptr(&stdin_buffer), len);
316: packet_send();
317: buffer_consume(&stdin_buffer, len);
318: /* If we have a pending EOF, send it now. */
319: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
320: packet_start(SSH_CMSG_EOF);
321: packet_send();
322: }
1.1 deraadt 323: }
324: }
325:
1.13 markus 326: /*
327: * Checks if the client window has changed, and sends a packet about it to
328: * the server if so. The actual change is detected elsewhere (by a software
329: * interrupt on Unix); this just checks the flag and sends a message if
330: * appropriate.
331: */
1.1 deraadt 332:
1.20 markus 333: void
1.11 markus 334: client_check_window_change()
1.1 deraadt 335: {
1.16 markus 336: struct winsize ws;
337:
338: if (! received_window_change_signal)
339: return;
340: /** XXX race */
341: received_window_change_signal = 0;
342:
343: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
344: return;
345:
1.37 markus 346: debug2("client_check_window_change: changed");
1.16 markus 347:
348: if (compat20) {
349: channel_request_start(session_ident, "window-change", 0);
350: packet_put_int(ws.ws_col);
351: packet_put_int(ws.ws_row);
352: packet_put_int(ws.ws_xpixel);
353: packet_put_int(ws.ws_ypixel);
354: packet_send();
355: } else {
356: packet_start(SSH_CMSG_WINDOW_SIZE);
357: packet_put_int(ws.ws_row);
358: packet_put_int(ws.ws_col);
359: packet_put_int(ws.ws_xpixel);
360: packet_put_int(ws.ws_ypixel);
361: packet_send();
1.1 deraadt 362: }
363: }
364:
1.13 markus 365: /*
366: * Waits until the client can do something (some data becomes available on
367: * one of the file descriptors).
368: */
1.1 deraadt 369:
1.20 markus 370: void
1.11 markus 371: client_wait_until_can_do_something(fd_set * readset, fd_set * writeset)
372: {
373: /* Initialize select masks. */
374: FD_ZERO(readset);
1.17 markus 375: FD_ZERO(writeset);
1.11 markus 376:
1.16 markus 377: if (!compat20) {
1.17 markus 378: /* Read from the connection, unless our buffers are full. */
1.16 markus 379: if (buffer_len(&stdout_buffer) < buffer_high &&
380: buffer_len(&stderr_buffer) < buffer_high &&
381: channel_not_very_much_buffered_data())
382: FD_SET(connection_in, readset);
1.17 markus 383: /*
384: * Read from stdin, unless we have seen EOF or have very much
385: * buffered data to send to the server.
386: */
387: if (!stdin_eof && packet_not_very_much_data_to_write())
388: FD_SET(fileno(stdin), readset);
389:
390: /* Select stdout/stderr if have data in buffer. */
391: if (buffer_len(&stdout_buffer) > 0)
392: FD_SET(fileno(stdout), writeset);
393: if (buffer_len(&stderr_buffer) > 0)
394: FD_SET(fileno(stderr), writeset);
1.16 markus 395: } else {
1.11 markus 396: FD_SET(connection_in, readset);
1.16 markus 397: }
1.11 markus 398:
399: /* Add any selections by the channel mechanism. */
400: channel_prepare_select(readset, writeset);
401:
402: /* Select server connection if have data to write to the server. */
403: if (packet_have_data_to_write())
404: FD_SET(connection_out, writeset);
405:
1.16 markus 406: /* move UP XXX */
1.11 markus 407: /* Update maximum file descriptor number, if appropriate. */
408: if (channel_max_fd() > max_fd)
409: max_fd = channel_max_fd();
410:
1.13 markus 411: /*
412: * Wait for something to happen. This will suspend the process until
413: * some selected descriptor can be read, written, or has some other
414: * event pending. Note: if you want to implement SSH_MSG_IGNORE
415: * messages to fool traffic analysis, this might be the place to do
416: * it: just have a random timeout for the select, and send a random
417: * SSH_MSG_IGNORE packet when the timeout expires.
418: */
1.11 markus 419:
420: if (select(max_fd + 1, readset, writeset, NULL, NULL) < 0) {
421: char buf[100];
422: /* Some systems fail to clear these automatically. */
423: FD_ZERO(readset);
424: FD_ZERO(writeset);
425: if (errno == EINTR)
426: return;
427: /* Note: we might still have data in the buffers. */
428: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
429: buffer_append(&stderr_buffer, buf, strlen(buf));
430: stderr_bytes += strlen(buf);
431: quit_pending = 1;
432: }
433: }
434:
1.20 markus 435: void
1.31 markus 436: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 437: {
1.11 markus 438: struct winsize oldws, newws;
439:
440: /* Flush stdout and stderr buffers. */
1.31 markus 441: if (buffer_len(bout) > 0)
442: atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
443: if (buffer_len(berr) > 0)
444: atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 445:
446: leave_raw_mode();
447:
1.13 markus 448: /*
449: * Free (and clear) the buffer to reduce the amount of data that gets
450: * written to swap.
451: */
1.31 markus 452: buffer_free(bin);
453: buffer_free(bout);
454: buffer_free(berr);
1.11 markus 455:
456: /* Save old window size. */
457: ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
458:
459: /* Send the suspend signal to the program itself. */
460: kill(getpid(), SIGTSTP);
461:
462: /* Check if the window size has changed. */
463: if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
464: (oldws.ws_row != newws.ws_row ||
465: oldws.ws_col != newws.ws_col ||
466: oldws.ws_xpixel != newws.ws_xpixel ||
467: oldws.ws_ypixel != newws.ws_ypixel))
468: received_window_change_signal = 1;
469:
470: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 471: buffer_init(bin);
472: buffer_init(bout);
473: buffer_init(berr);
1.11 markus 474:
475: enter_raw_mode();
476: }
477:
1.20 markus 478: void
1.17 markus 479: client_process_net_input(fd_set * readset)
1.11 markus 480: {
1.17 markus 481: int len;
482: char buf[8192];
1.11 markus 483:
1.13 markus 484: /*
485: * Read input from the server, and add any such data to the buffer of
486: * the packet subsystem.
487: */
1.11 markus 488: if (FD_ISSET(connection_in, readset)) {
489: /* Read as much as possible. */
490: len = read(connection_in, buf, sizeof(buf));
491: if (len == 0) {
492: /* Received EOF. The remote host has closed the connection. */
493: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
494: host);
1.1 deraadt 495: buffer_append(&stderr_buffer, buf, strlen(buf));
496: stderr_bytes += strlen(buf);
497: quit_pending = 1;
498: return;
1.11 markus 499: }
1.13 markus 500: /*
501: * There is a kernel bug on Solaris that causes select to
502: * sometimes wake up even though there is no data available.
503: */
1.11 markus 504: if (len < 0 && errno == EAGAIN)
505: len = 0;
506:
507: if (len < 0) {
508: /* An error has encountered. Perhaps there is a network problem. */
509: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
510: host, strerror(errno));
511: buffer_append(&stderr_buffer, buf, strlen(buf));
512: stderr_bytes += strlen(buf);
513: quit_pending = 1;
514: return;
515: }
516: packet_process_incoming(buf, len);
517: }
1.17 markus 518: }
1.16 markus 519:
1.31 markus 520: /* process the characters one by one */
521: int
522: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
523: {
1.32 markus 524: char string[1024];
1.31 markus 525: pid_t pid;
526: int bytes = 0;
1.42 markus 527: u_int i;
528: u_char ch;
1.31 markus 529: char *s;
530:
531: for (i = 0; i < len; i++) {
532: /* Get one character at a time. */
533: ch = buf[i];
534:
535: if (escape_pending) {
536: /* We have previously seen an escape character. */
537: /* Clear the flag now. */
538: escape_pending = 0;
539:
540: /* Process the escaped character. */
541: switch (ch) {
542: case '.':
543: /* Terminate the connection. */
1.32 markus 544: snprintf(string, sizeof string, "%c.\r\n", escape_char);
545: buffer_append(berr, string, strlen(string));
546: /*stderr_bytes += strlen(string); XXX*/
1.31 markus 547:
548: quit_pending = 1;
549: return -1;
550:
551: case 'Z' - 64:
552: /* Suspend the program. */
553: /* Print a message to that effect to the user. */
1.32 markus 554: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
555: buffer_append(berr, string, strlen(string));
556: /*stderr_bytes += strlen(string); XXX*/
1.31 markus 557:
558: /* Restore terminal modes and suspend. */
559: client_suspend_self(bin, bout, berr);
560:
561: /* We have been continued. */
562: continue;
563:
564: case '&':
565: /* XXX does not work yet with proto 2 */
566: if (compat20)
567: continue;
568: /*
569: * Detach the program (continue to serve connections,
570: * but put in background and no more new connections).
571: */
572: if (!stdin_eof) {
573: /*
574: * Sending SSH_CMSG_EOF alone does not always appear
575: * to be enough. So we try to send an EOF character
576: * first.
577: */
578: packet_start(SSH_CMSG_STDIN_DATA);
579: packet_put_string("\004", 1);
580: packet_send();
581: /* Close stdin. */
582: stdin_eof = 1;
583: if (buffer_len(bin) == 0) {
584: packet_start(SSH_CMSG_EOF);
585: packet_send();
586: }
587: }
588: /* Restore tty modes. */
589: leave_raw_mode();
590:
591: /* Stop listening for new connections. */
592: channel_stop_listening();
593:
594: printf("%c& [backgrounded]\n", escape_char);
595:
596: /* Fork into background. */
597: pid = fork();
598: if (pid < 0) {
599: error("fork: %.100s", strerror(errno));
600: continue;
601: }
602: if (pid != 0) { /* This is the parent. */
603: /* The parent just exits. */
604: exit(0);
605: }
606: /* The child continues serving connections. */
607: continue; /*XXX ? */
608:
609: case '?':
1.32 markus 610: snprintf(string, sizeof string,
1.31 markus 611: "%c?\r\n\
612: Supported escape sequences:\r\n\
613: ~. - terminate connection\r\n\
614: ~^Z - suspend ssh\r\n\
615: ~# - list forwarded connections\r\n\
616: ~& - background ssh (when waiting for connections to terminate)\r\n\
617: ~? - this message\r\n\
618: ~~ - send the escape character by typing it twice\r\n\
619: (Note that escapes are only recognized immediately after newline.)\r\n",
620: escape_char);
1.32 markus 621: buffer_append(berr, string, strlen(string));
1.31 markus 622: continue;
623:
624: case '#':
1.32 markus 625: snprintf(string, sizeof string, "%c#\r\n", escape_char);
626: buffer_append(berr, string, strlen(string));
1.31 markus 627: s = channel_open_message();
628: buffer_append(berr, s, strlen(s));
629: xfree(s);
630: continue;
631:
632: default:
633: if (ch != escape_char) {
634: buffer_put_char(bin, escape_char);
635: bytes++;
636: }
637: /* Escaped characters fall through here */
638: break;
639: }
640: } else {
641: /*
642: * The previous character was not an escape char. Check if this
643: * is an escape.
644: */
645: if (last_was_cr && ch == escape_char) {
646: /* It is. Set the flag and continue to next character. */
647: escape_pending = 1;
648: continue;
649: }
650: }
651:
652: /*
653: * Normal character. Record whether it was a newline,
654: * and append it to the buffer.
655: */
656: last_was_cr = (ch == '\r' || ch == '\n');
657: buffer_put_char(bin, ch);
658: bytes++;
659: }
660: return bytes;
661: }
662:
1.20 markus 663: void
1.17 markus 664: client_process_input(fd_set * readset)
665: {
1.31 markus 666: int ret;
1.21 deraadt 667: int len;
1.31 markus 668: char buf[8192];
1.16 markus 669:
1.11 markus 670: /* Read input from stdin. */
671: if (FD_ISSET(fileno(stdin), readset)) {
672: /* Read as much as possible. */
673: len = read(fileno(stdin), buf, sizeof(buf));
674: if (len <= 0) {
1.13 markus 675: /*
676: * Received EOF or error. They are treated
677: * similarly, except that an error message is printed
678: * if it was an error condition.
679: */
1.11 markus 680: if (len < 0) {
681: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
682: buffer_append(&stderr_buffer, buf, strlen(buf));
683: stderr_bytes += strlen(buf);
684: }
685: /* Mark that we have seen EOF. */
686: stdin_eof = 1;
1.13 markus 687: /*
688: * Send an EOF message to the server unless there is
689: * data in the buffer. If there is data in the
690: * buffer, no message will be sent now. Code
691: * elsewhere will send the EOF when the buffer
692: * becomes empty if stdin_eof is set.
693: */
1.11 markus 694: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 695: packet_start(SSH_CMSG_EOF);
696: packet_send();
1.11 markus 697: }
698: } else if (escape_char == -1) {
1.13 markus 699: /*
700: * Normal successful read, and no escape character.
701: * Just append the data to buffer.
702: */
1.11 markus 703: buffer_append(&stdin_buffer, buf, len);
704: stdin_bytes += len;
705: } else {
1.13 markus 706: /*
707: * Normal, successful read. But we have an escape character
708: * and have to process the characters one by one.
709: */
1.31 markus 710: ret = process_escapes(&stdin_buffer, &stdout_buffer, &stderr_buffer, buf, len);
711: if (ret == -1)
712: return;
713: stdout_bytes += ret;
1.11 markus 714: }
715: }
716: }
717:
1.20 markus 718: void
1.11 markus 719: client_process_output(fd_set * writeset)
720: {
721: int len;
722: char buf[100];
1.1 deraadt 723:
1.11 markus 724: /* Write buffered output to stdout. */
725: if (FD_ISSET(fileno(stdout), writeset)) {
726: /* Write as much data as possible. */
727: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 728: buffer_len(&stdout_buffer));
1.11 markus 729: if (len <= 0) {
730: if (errno == EAGAIN)
731: len = 0;
732: else {
1.13 markus 733: /*
734: * An error or EOF was encountered. Put an
735: * error message to stderr buffer.
736: */
1.11 markus 737: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
738: buffer_append(&stderr_buffer, buf, strlen(buf));
739: stderr_bytes += strlen(buf);
740: quit_pending = 1;
741: return;
742: }
743: }
744: /* Consume printed data from the buffer. */
745: buffer_consume(&stdout_buffer, len);
746: }
747: /* Write buffered output to stderr. */
748: if (FD_ISSET(fileno(stderr), writeset)) {
749: /* Write as much data as possible. */
750: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 751: buffer_len(&stderr_buffer));
1.11 markus 752: if (len <= 0) {
753: if (errno == EAGAIN)
754: len = 0;
755: else {
1.13 markus 756: /* EOF or error, but can't even print error message. */
1.11 markus 757: quit_pending = 1;
758: return;
759: }
760: }
761: /* Consume printed characters from the buffer. */
762: buffer_consume(&stderr_buffer, len);
763: }
1.1 deraadt 764: }
765:
1.13 markus 766: /*
1.15 markus 767: * Get packets from the connection input buffer, and process them as long as
768: * there are packets available.
769: *
770: * Any unknown packets received during the actual
771: * session cause the session to terminate. This is
772: * intended to make debugging easier since no
773: * confirmations are sent. Any compatible protocol
774: * extensions must be negotiated during the
775: * preparatory phase.
776: */
777:
1.20 markus 778: void
1.15 markus 779: client_process_buffered_input_packets()
780: {
1.36 markus 781: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL);
1.15 markus 782: }
783:
1.31 markus 784: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 785:
786: int
1.31 markus 787: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 788: {
1.31 markus 789: /* XXX we assume c->extended is writeable */
790: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 791: }
792:
1.15 markus 793: /*
1.13 markus 794: * Implements the interactive session with the server. This is called after
795: * the user has been authenticated, and a command has been started on the
796: * remote host. If escape_char != -1, it is the character used as an escape
797: * character for terminating or suspending the session.
798: */
1.1 deraadt 799:
1.20 markus 800: int
1.30 markus 801: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 802: {
1.11 markus 803: double start_time, total_time;
804: int len;
805: char buf[100];
806:
807: debug("Entering interactive session.");
808:
809: start_time = get_current_time();
810:
811: /* Initialize variables. */
812: escape_pending = 0;
813: last_was_cr = 1;
814: exit_status = -1;
815: stdin_eof = 0;
816: buffer_high = 64 * 1024;
817: connection_in = packet_get_connection_in();
818: connection_out = packet_get_connection_out();
819: max_fd = connection_in;
820: if (connection_out > max_fd)
821: max_fd = connection_out;
822: stdin_bytes = 0;
823: stdout_bytes = 0;
824: stderr_bytes = 0;
825: quit_pending = 0;
826: escape_char = escape_char_arg;
827:
828: /* Initialize buffers. */
829: buffer_init(&stdin_buffer);
830: buffer_init(&stdout_buffer);
831: buffer_init(&stderr_buffer);
832:
1.15 markus 833: client_init_dispatch();
834:
1.11 markus 835: /* Set signal handlers to restore non-blocking mode. */
836: signal(SIGINT, signal_handler);
837: signal(SIGQUIT, signal_handler);
838: signal(SIGTERM, signal_handler);
839: signal(SIGPIPE, SIG_IGN);
840: if (have_pty)
841: signal(SIGWINCH, window_change_handler);
842:
843: if (have_pty)
844: enter_raw_mode();
845:
1.28 provos 846: /* Check if we should immediately send eof on stdin. */
1.17 markus 847: if (!compat20)
1.16 markus 848: client_check_initial_eof_on_stdin();
1.11 markus 849:
1.30 markus 850: if (compat20 && escape_char != -1)
851: channel_register_filter(ssh2_chan_id, simple_escape_filter);
852:
1.11 markus 853: /* Main loop of the client for the interactive session mode. */
854: while (!quit_pending) {
855: fd_set readset, writeset;
856:
1.13 markus 857: /* Process buffered packets sent by the server. */
1.11 markus 858: client_process_buffered_input_packets();
859:
1.16 markus 860: if (compat20 && !channel_still_open()) {
1.37 markus 861: debug2("!channel_still_open.");
1.16 markus 862: break;
863: }
864:
1.13 markus 865: /*
866: * Make packets of buffered stdin data, and buffer them for
867: * sending to the server.
868: */
1.17 markus 869: if (!compat20)
1.16 markus 870: client_make_packets_from_stdin_data();
1.11 markus 871:
1.13 markus 872: /*
873: * Make packets from buffered channel data, and buffer them
874: * for sending to the server.
875: */
1.11 markus 876: if (packet_not_very_much_data_to_write())
877: channel_output_poll();
878:
1.13 markus 879: /*
880: * Check if the window size has changed, and buffer a message
881: * about it to the server if so.
882: */
1.11 markus 883: client_check_window_change();
884:
885: if (quit_pending)
886: break;
887:
1.13 markus 888: /*
889: * Wait until we have something to do (something becomes
890: * available on one of the descriptors).
891: */
1.11 markus 892: client_wait_until_can_do_something(&readset, &writeset);
893:
894: if (quit_pending)
895: break;
896:
897: /* Do channel operations. */
898: channel_after_select(&readset, &writeset);
899:
1.17 markus 900: /* Buffer input from the connection. */
901: client_process_net_input(&readset);
902:
903: if (quit_pending)
904: break;
1.11 markus 905:
1.17 markus 906: if (!compat20) {
907: /* Buffer data from stdin */
908: client_process_input(&readset);
909: /*
910: * Process output to stdout and stderr. Output to
911: * the connection is processed elsewhere (above).
912: */
1.16 markus 913: client_process_output(&writeset);
1.17 markus 914: }
1.11 markus 915:
1.13 markus 916: /* Send as much buffered packet data as possible to the sender. */
1.11 markus 917: if (FD_ISSET(connection_out, &writeset))
918: packet_write_poll();
919: }
920:
921: /* Terminate the session. */
922:
923: /* Stop watching for window change. */
924: if (have_pty)
925: signal(SIGWINCH, SIG_DFL);
926:
927: /* Stop listening for connections. */
928: channel_stop_listening();
929:
1.13 markus 930: /*
931: * In interactive mode (with pseudo tty) display a message indicating
932: * that the connection has been closed.
933: */
1.11 markus 934: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
935: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
936: buffer_append(&stderr_buffer, buf, strlen(buf));
937: stderr_bytes += strlen(buf);
938: }
939: /* Output any buffered data for stdout. */
940: while (buffer_len(&stdout_buffer) > 0) {
941: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 942: buffer_len(&stdout_buffer));
1.11 markus 943: if (len <= 0) {
944: error("Write failed flushing stdout buffer.");
945: break;
946: }
947: buffer_consume(&stdout_buffer, len);
948: }
949:
950: /* Output any buffered data for stderr. */
951: while (buffer_len(&stderr_buffer) > 0) {
952: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 953: buffer_len(&stderr_buffer));
1.11 markus 954: if (len <= 0) {
955: error("Write failed flushing stderr buffer.");
956: break;
957: }
958: buffer_consume(&stderr_buffer, len);
959: }
960:
961: if (have_pty)
962: leave_raw_mode();
963:
964: /* Clear and free any buffers. */
965: memset(buf, 0, sizeof(buf));
966: buffer_free(&stdin_buffer);
967: buffer_free(&stdout_buffer);
968: buffer_free(&stderr_buffer);
969:
970: /* Report bytes transferred, and transfer rates. */
971: total_time = get_current_time() - start_time;
972: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
973: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
974: if (total_time > 0)
975: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
976: stdin_bytes / total_time, stdout_bytes / total_time,
977: stderr_bytes / total_time);
978:
979: /* Return the exit status of the program. */
980: debug("Exit status %d", exit_status);
981: return exit_status;
1.15 markus 982: }
983:
984: /*********/
985:
986: void
1.36 markus 987: client_input_stdout_data(int type, int plen, void *ctxt)
1.15 markus 988: {
1.42 markus 989: u_int data_len;
1.15 markus 990: char *data = packet_get_string(&data_len);
991: packet_integrity_check(plen, 4 + data_len, type);
992: buffer_append(&stdout_buffer, data, data_len);
993: stdout_bytes += data_len;
994: memset(data, 0, data_len);
995: xfree(data);
996: }
997: void
1.36 markus 998: client_input_stderr_data(int type, int plen, void *ctxt)
1.15 markus 999: {
1.42 markus 1000: u_int data_len;
1.15 markus 1001: char *data = packet_get_string(&data_len);
1002: packet_integrity_check(plen, 4 + data_len, type);
1003: buffer_append(&stderr_buffer, data, data_len);
1004: stdout_bytes += data_len;
1005: memset(data, 0, data_len);
1006: xfree(data);
1007: }
1008: void
1.36 markus 1009: client_input_exit_status(int type, int plen, void *ctxt)
1.15 markus 1010: {
1011: packet_integrity_check(plen, 4, type);
1012: exit_status = packet_get_int();
1013: /* Acknowledge the exit. */
1014: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1015: packet_send();
1016: /*
1017: * Must wait for packet to be sent since we are
1018: * exiting the loop.
1019: */
1020: packet_write_wait();
1021: /* Flag that we want to exit. */
1022: quit_pending = 1;
1023: }
1024:
1.40 markus 1025: Channel *
1026: client_request_forwarded_tcpip(const char *request_type, int rchan)
1027: {
1028: Channel* c = NULL;
1029: char *listen_address, *originator_address;
1030: int listen_port, originator_port;
1031: int sock, newch;
1032:
1033: /* Get rest of the packet */
1034: listen_address = packet_get_string(NULL);
1035: listen_port = packet_get_int();
1036: originator_address = packet_get_string(NULL);
1037: originator_port = packet_get_int();
1038: packet_done();
1039:
1040: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1041: listen_address, listen_port, originator_address, originator_port);
1042:
1043: sock = channel_connect_by_listen_adress(listen_port);
1044: if (sock >= 0) {
1045: newch = channel_new("forwarded-tcpip",
1.41 markus 1046: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1.40 markus 1047: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1048: xstrdup(originator_address), 1);
1049: c = channel_lookup(newch);
1050: }
1051: xfree(originator_address);
1052: xfree(listen_address);
1053: return c;
1054: }
1055:
1056: Channel*
1057: client_request_x11(const char *request_type, int rchan)
1058: {
1059: Channel *c = NULL;
1060: char *originator;
1061: int originator_port;
1062: int sock, newch;
1063:
1064: if (!options.forward_x11) {
1065: error("Warning: ssh server tried X11 forwarding.");
1066: error("Warning: this is probably a break in attempt by a malicious server.");
1067: return NULL;
1068: }
1069: originator = packet_get_string(NULL);
1070: if (datafellows & SSH_BUG_X11FWD) {
1071: debug2("buggy server: x11 request w/o originator_port");
1072: originator_port = 0;
1073: } else {
1074: originator_port = packet_get_int();
1075: }
1076: packet_done();
1077: /* XXX check permission */
1078: sock = x11_connect_display();
1079: if (sock >= 0) {
1080: newch = channel_new("x11",
1081: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1082: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
1083: xstrdup("x11"), 1);
1084: c = channel_lookup(newch);
1085: }
1086: xfree(originator);
1087: return c;
1088: }
1089:
1090: Channel*
1091: client_request_agent(const char *request_type, int rchan)
1092: {
1093: Channel *c = NULL;
1094: int sock, newch;
1095:
1096: if (!options.forward_agent) {
1097: error("Warning: ssh server tried agent forwarding.");
1098: error("Warning: this is probably a break in attempt by a malicious server.");
1099: return NULL;
1100: }
1101: sock = ssh_get_authentication_socket();
1102: if (sock >= 0) {
1103: newch = channel_new("authentication agent connection",
1104: SSH_CHANNEL_OPEN, sock, sock, -1,
1105: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1106: xstrdup("authentication agent connection"), 1);
1107: c = channel_lookup(newch);
1108: }
1109: return c;
1110: }
1111:
1.22 markus 1112: /* XXXX move to generic input handler */
1113: void
1.36 markus 1114: client_input_channel_open(int type, int plen, void *ctxt)
1.22 markus 1115: {
1116: Channel *c = NULL;
1117: char *ctype;
1.42 markus 1118: u_int len;
1.22 markus 1119: int rchan;
1120: int rmaxpack;
1121: int rwindow;
1122:
1123: ctype = packet_get_string(&len);
1124: rchan = packet_get_int();
1125: rwindow = packet_get_int();
1126: rmaxpack = packet_get_int();
1127:
1.24 markus 1128: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1129: ctype, rchan, rwindow, rmaxpack);
1130:
1.40 markus 1131: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1132: c = client_request_forwarded_tcpip(ctype, rchan);
1133: } else if (strcmp(ctype, "x11") == 0) {
1134: c = client_request_x11(ctype, rchan);
1135: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1136: c = client_request_agent(ctype, rchan);
1.22 markus 1137: }
1138: /* XXX duplicate : */
1139: if (c != NULL) {
1140: debug("confirm %s", ctype);
1141: c->remote_id = rchan;
1142: c->remote_window = rwindow;
1143: c->remote_maxpacket = rmaxpack;
1144:
1145: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1146: packet_put_int(c->remote_id);
1147: packet_put_int(c->self);
1148: packet_put_int(c->local_window);
1149: packet_put_int(c->local_maxpacket);
1150: packet_send();
1151: } else {
1152: debug("failure %s", ctype);
1153: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1154: packet_put_int(rchan);
1155: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1156: packet_put_cstring("bla bla");
1157: packet_put_cstring("");
1158: packet_send();
1159: }
1160: xfree(ctype);
1161: }
1162:
1.20 markus 1163: void
1.16 markus 1164: client_init_dispatch_20()
1165: {
1166: dispatch_init(&dispatch_protocol_error);
1167: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1168: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1169: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1170: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1171: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1172: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1173: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1174: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request);
1175: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1176: }
1.20 markus 1177: void
1.15 markus 1178: client_init_dispatch_13()
1179: {
1180: dispatch_init(NULL);
1181: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1182: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1183: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1184: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1185: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1186: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1187: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1188: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1189: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1190:
1191: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1192: &auth_input_open_request : &deny_input_open);
1193: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1194: &x11_input_open : &deny_input_open);
1.15 markus 1195: }
1.20 markus 1196: void
1.15 markus 1197: client_init_dispatch_15()
1198: {
1199: client_init_dispatch_13();
1200: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1201: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1202: }
1.20 markus 1203: void
1.15 markus 1204: client_init_dispatch()
1205: {
1.16 markus 1206: if (compat20)
1207: client_init_dispatch_20();
1208: else if (compat13)
1.15 markus 1209: client_init_dispatch_13();
1210: else
1211: client_init_dispatch_15();
1.16 markus 1212: }
1213:
1214: void
1215: client_input_channel_req(int id, void *arg)
1216: {
1217: Channel *c = NULL;
1.42 markus 1218: u_int len;
1.16 markus 1219: int success = 0;
1220: int reply;
1221: char *rtype;
1222:
1223: rtype = packet_get_string(&len);
1224: reply = packet_get_char();
1225:
1.23 markus 1226: debug("client_input_channel_req: rtype %s reply %d", rtype, reply);
1.16 markus 1227:
1228: c = channel_lookup(id);
1229: if (c == NULL)
1.35 markus 1230: fatal("client_input_channel_req: channel %d: bad channel", id);
1.16 markus 1231:
1232: if (session_ident == -1) {
1233: error("client_input_channel_req: no channel %d", id);
1234: } else if (id != session_ident) {
1235: error("client_input_channel_req: bad channel %d != %d",
1236: id, session_ident);
1237: } else if (strcmp(rtype, "exit-status") == 0) {
1238: success = 1;
1239: exit_status = packet_get_int();
1.19 markus 1240: packet_done();
1.16 markus 1241: }
1242: if (reply) {
1243: packet_start(success ?
1244: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1245: packet_put_int(c->remote_id);
1246: packet_send();
1247: }
1248: xfree(rtype);
1249: }
1250:
1251: void
1.43 markus 1252: clientloop_set_session_ident(int id)
1.16 markus 1253: {
1.43 markus 1254: debug2("clientloop_set_session_ident: id %d", id);
1.16 markus 1255: session_ident = id;
1256: channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST,
1257: client_input_channel_req, (void *)0);
1.1 deraadt 1258: }
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