Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.46
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"
1.46 ! markus 62: RCSID("$OpenBSD: clientloop.c,v 1.45 2001/01/21 19:05:47 markus Exp $");
1.1 deraadt 63:
1.45 markus 64: #include "ssh.h"
65: #include "ssh1.h"
66: #include "ssh2.h"
1.1 deraadt 67: #include "xmalloc.h"
68: #include "packet.h"
69: #include "buffer.h"
1.15 markus 70: #include "compat.h"
71: #include "channels.h"
72: #include "dispatch.h"
1.30 markus 73: #include "buffer.h"
74: #include "bufaux.h"
1.40 markus 75: #include "key.h"
1.45 markus 76: #include "log.h"
77: #include "readconf.h"
78: #include "clientloop.h"
1.40 markus 79: #include "authfd.h"
1.45 markus 80: #include "atomicio.h"
1.39 markus 81:
82: /* import options */
83: extern Options options;
84:
1.1 deraadt 85: /* Flag indicating that stdin should be redirected from /dev/null. */
86: extern int stdin_null_flag;
87:
1.13 markus 88: /*
89: * Name of the host we are connecting to. This is the name given on the
90: * command line, or the HostName specified for the user-supplied name in a
91: * configuration file.
92: */
1.1 deraadt 93: extern char *host;
94:
1.13 markus 95: /*
96: * Flag to indicate that we have received a window change signal which has
97: * not yet been processed. This will cause a message indicating the new
98: * window size to be sent to the server a little later. This is volatile
99: * because this is updated in a signal handler.
100: */
1.1 deraadt 101: static volatile int received_window_change_signal = 0;
102:
103: /* Terminal modes, as saved by enter_raw_mode. */
104: static struct termios saved_tio;
105:
1.13 markus 106: /*
107: * Flag indicating whether we are in raw mode. This is used by
108: * enter_raw_mode and leave_raw_mode.
109: */
1.1 deraadt 110: static int in_raw_mode = 0;
111:
112: /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
113: static int in_non_blocking_mode = 0;
114:
115: /* Common data for the client loop code. */
1.31 markus 116: static int quit_pending; /* Set to non-zero to quit the client loop. */
117: static int escape_char; /* Escape character. */
1.11 markus 118: static int escape_pending; /* Last character was the escape character */
119: static int last_was_cr; /* Last character was a newline. */
120: static int exit_status; /* Used to store the exit status of the command. */
121: static int stdin_eof; /* EOF has been encountered on standard error. */
122: static Buffer stdin_buffer; /* Buffer for stdin data. */
123: static Buffer stdout_buffer; /* Buffer for stdout data. */
124: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 125: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
126: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 127: static int connection_in; /* Connection to server (input). */
128: static int connection_out; /* Connection to server (output). */
1.1 deraadt 129:
1.16 markus 130:
131: void client_init_dispatch(void);
132: int session_ident = -1;
133:
1.13 markus 134: /* Returns the user\'s terminal to normal mode if it had been put in raw mode. */
1.1 deraadt 135:
1.20 markus 136: void
1.11 markus 137: leave_raw_mode()
1.1 deraadt 138: {
1.11 markus 139: if (!in_raw_mode)
140: return;
141: in_raw_mode = 0;
142: if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0)
143: perror("tcsetattr");
1.1 deraadt 144:
1.11 markus 145: fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL);
1.1 deraadt 146: }
147:
148: /* Puts the user\'s terminal in raw mode. */
149:
1.20 markus 150: void
1.11 markus 151: enter_raw_mode()
1.1 deraadt 152: {
1.11 markus 153: struct termios tio;
1.1 deraadt 154:
1.11 markus 155: if (tcgetattr(fileno(stdin), &tio) < 0)
156: perror("tcgetattr");
157: saved_tio = tio;
158: tio.c_iflag |= IGNPAR;
159: tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
160: tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
1.1 deraadt 161: #ifdef IEXTEN
1.11 markus 162: tio.c_lflag &= ~IEXTEN;
163: #endif /* IEXTEN */
164: tio.c_oflag &= ~OPOST;
165: tio.c_cc[VMIN] = 1;
166: tio.c_cc[VTIME] = 0;
167: if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0)
168: perror("tcsetattr");
169: in_raw_mode = 1;
1.1 deraadt 170:
1.11 markus 171: fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL);
172: }
1.1 deraadt 173:
174: /* Restores stdin to blocking mode. */
175:
1.20 markus 176: void
1.11 markus 177: leave_non_blocking()
1.1 deraadt 178: {
1.11 markus 179: if (in_non_blocking_mode) {
180: (void) fcntl(fileno(stdin), F_SETFL, 0);
181: in_non_blocking_mode = 0;
182: fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL);
183: }
1.1 deraadt 184: }
185:
1.11 markus 186: /* Puts stdin terminal in non-blocking mode. */
187:
1.20 markus 188: void
1.11 markus 189: enter_non_blocking()
1.1 deraadt 190: {
1.11 markus 191: in_non_blocking_mode = 1;
192: (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
193: fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL);
1.1 deraadt 194: }
195:
1.13 markus 196: /*
197: * Signal handler for the window change signal (SIGWINCH). This just sets a
198: * flag indicating that the window has changed.
199: */
1.1 deraadt 200:
1.20 markus 201: void
1.11 markus 202: window_change_handler(int sig)
1.1 deraadt 203: {
1.11 markus 204: received_window_change_signal = 1;
205: signal(SIGWINCH, window_change_handler);
1.1 deraadt 206: }
207:
1.13 markus 208: /*
209: * Signal handler for signals that cause the program to terminate. These
210: * signals must be trapped to restore terminal modes.
211: */
1.1 deraadt 212:
1.20 markus 213: void
1.11 markus 214: signal_handler(int sig)
1.1 deraadt 215: {
1.11 markus 216: if (in_raw_mode)
217: leave_raw_mode();
218: if (in_non_blocking_mode)
219: leave_non_blocking();
220: channel_stop_listening();
221: packet_close();
222: fatal("Killed by signal %d.", sig);
1.1 deraadt 223: }
224:
1.13 markus 225: /*
226: * Returns current time in seconds from Jan 1, 1970 with the maximum
227: * available resolution.
228: */
1.1 deraadt 229:
1.20 markus 230: double
1.11 markus 231: get_current_time()
1.1 deraadt 232: {
1.11 markus 233: struct timeval tv;
234: gettimeofday(&tv, NULL);
235: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.1 deraadt 236: }
237:
1.13 markus 238: /*
239: * This is called when the interactive is entered. This checks if there is
240: * an EOF coming on stdin. We must check this explicitly, as select() does
241: * not appear to wake up when redirecting from /dev/null.
242: */
1.1 deraadt 243:
1.20 markus 244: void
1.11 markus 245: client_check_initial_eof_on_stdin()
1.1 deraadt 246: {
1.11 markus 247: int len;
248: char buf[1];
1.1 deraadt 249:
1.13 markus 250: /*
251: * If standard input is to be "redirected from /dev/null", we simply
252: * mark that we have seen an EOF and send an EOF message to the
253: * server. Otherwise, we try to read a single character; it appears
254: * that for some files, such /dev/null, select() never wakes up for
255: * read for this descriptor, which means that we never get EOF. This
256: * way we will get the EOF if stdin comes from /dev/null or similar.
257: */
1.11 markus 258: if (stdin_null_flag) {
259: /* Fake EOF on stdin. */
260: debug("Sending eof.");
261: stdin_eof = 1;
262: packet_start(SSH_CMSG_EOF);
263: packet_send();
264: } else {
265: enter_non_blocking();
266:
267: /* Check for immediate EOF on stdin. */
268: len = read(fileno(stdin), buf, 1);
269: if (len == 0) {
1.13 markus 270: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 271: debug("Sending eof.");
272: stdin_eof = 1;
273: packet_start(SSH_CMSG_EOF);
274: packet_send();
275: } else if (len > 0) {
1.13 markus 276: /*
277: * Got data. We must store the data in the buffer,
278: * and also process it as an escape character if
279: * appropriate.
280: */
1.42 markus 281: if ((u_char) buf[0] == escape_char)
1.11 markus 282: escape_pending = 1;
283: else {
284: buffer_append(&stdin_buffer, buf, 1);
285: stdin_bytes += 1;
286: }
287: }
288: leave_non_blocking();
289: }
1.1 deraadt 290: }
291:
292:
1.13 markus 293: /*
294: * Make packets from buffered stdin data, and buffer them for sending to the
295: * connection.
296: */
1.1 deraadt 297:
1.20 markus 298: void
1.11 markus 299: client_make_packets_from_stdin_data()
1.1 deraadt 300: {
1.42 markus 301: u_int len;
1.1 deraadt 302:
1.11 markus 303: /* Send buffered stdin data to the server. */
304: while (buffer_len(&stdin_buffer) > 0 &&
305: packet_not_very_much_data_to_write()) {
306: len = buffer_len(&stdin_buffer);
307: /* Keep the packets at reasonable size. */
308: if (len > packet_get_maxsize())
309: len = packet_get_maxsize();
310: packet_start(SSH_CMSG_STDIN_DATA);
311: packet_put_string(buffer_ptr(&stdin_buffer), len);
312: packet_send();
313: buffer_consume(&stdin_buffer, len);
314: /* If we have a pending EOF, send it now. */
315: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
316: packet_start(SSH_CMSG_EOF);
317: packet_send();
318: }
1.1 deraadt 319: }
320: }
321:
1.13 markus 322: /*
323: * Checks if the client window has changed, and sends a packet about it to
324: * the server if so. The actual change is detected elsewhere (by a software
325: * interrupt on Unix); this just checks the flag and sends a message if
326: * appropriate.
327: */
1.1 deraadt 328:
1.20 markus 329: void
1.11 markus 330: client_check_window_change()
1.1 deraadt 331: {
1.16 markus 332: struct winsize ws;
333:
334: if (! received_window_change_signal)
335: return;
336: /** XXX race */
337: received_window_change_signal = 0;
338:
339: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
340: return;
341:
1.37 markus 342: debug2("client_check_window_change: changed");
1.16 markus 343:
344: if (compat20) {
345: channel_request_start(session_ident, "window-change", 0);
346: packet_put_int(ws.ws_col);
347: packet_put_int(ws.ws_row);
348: packet_put_int(ws.ws_xpixel);
349: packet_put_int(ws.ws_ypixel);
350: packet_send();
351: } else {
352: packet_start(SSH_CMSG_WINDOW_SIZE);
353: packet_put_int(ws.ws_row);
354: packet_put_int(ws.ws_col);
355: packet_put_int(ws.ws_xpixel);
356: packet_put_int(ws.ws_ypixel);
357: packet_send();
1.1 deraadt 358: }
359: }
360:
1.13 markus 361: /*
362: * Waits until the client can do something (some data becomes available on
363: * one of the file descriptors).
364: */
1.1 deraadt 365:
1.20 markus 366: void
1.46 ! markus 367: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
! 368: int *maxfdp)
1.11 markus 369: {
1.46 ! markus 370: /* Add any selections by the channel mechanism. */
! 371: channel_prepare_select(readsetp, writesetp, maxfdp);
1.11 markus 372:
1.16 markus 373: if (!compat20) {
1.17 markus 374: /* Read from the connection, unless our buffers are full. */
1.16 markus 375: if (buffer_len(&stdout_buffer) < buffer_high &&
376: buffer_len(&stderr_buffer) < buffer_high &&
377: channel_not_very_much_buffered_data())
1.46 ! markus 378: FD_SET(connection_in, *readsetp);
1.17 markus 379: /*
380: * Read from stdin, unless we have seen EOF or have very much
381: * buffered data to send to the server.
382: */
383: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 ! markus 384: FD_SET(fileno(stdin), *readsetp);
1.17 markus 385:
386: /* Select stdout/stderr if have data in buffer. */
387: if (buffer_len(&stdout_buffer) > 0)
1.46 ! markus 388: FD_SET(fileno(stdout), *writesetp);
1.17 markus 389: if (buffer_len(&stderr_buffer) > 0)
1.46 ! markus 390: FD_SET(fileno(stderr), *writesetp);
1.16 markus 391: } else {
1.46 ! markus 392: FD_SET(connection_in, *readsetp);
1.16 markus 393: }
1.11 markus 394:
395: /* Select server connection if have data to write to the server. */
396: if (packet_have_data_to_write())
1.46 ! markus 397: FD_SET(connection_out, *writesetp);
1.11 markus 398:
1.13 markus 399: /*
400: * Wait for something to happen. This will suspend the process until
401: * some selected descriptor can be read, written, or has some other
402: * event pending. Note: if you want to implement SSH_MSG_IGNORE
403: * messages to fool traffic analysis, this might be the place to do
404: * it: just have a random timeout for the select, and send a random
405: * SSH_MSG_IGNORE packet when the timeout expires.
406: */
1.11 markus 407:
1.46 ! markus 408: if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
1.11 markus 409: char buf[100];
410: if (errno == EINTR)
411: return;
412: /* Note: we might still have data in the buffers. */
413: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
414: buffer_append(&stderr_buffer, buf, strlen(buf));
415: stderr_bytes += strlen(buf);
416: quit_pending = 1;
417: }
418: }
419:
1.20 markus 420: void
1.31 markus 421: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 422: {
1.11 markus 423: struct winsize oldws, newws;
424:
425: /* Flush stdout and stderr buffers. */
1.31 markus 426: if (buffer_len(bout) > 0)
427: atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
428: if (buffer_len(berr) > 0)
429: atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 430:
431: leave_raw_mode();
432:
1.13 markus 433: /*
434: * Free (and clear) the buffer to reduce the amount of data that gets
435: * written to swap.
436: */
1.31 markus 437: buffer_free(bin);
438: buffer_free(bout);
439: buffer_free(berr);
1.11 markus 440:
441: /* Save old window size. */
442: ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
443:
444: /* Send the suspend signal to the program itself. */
445: kill(getpid(), SIGTSTP);
446:
447: /* Check if the window size has changed. */
448: if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
449: (oldws.ws_row != newws.ws_row ||
450: oldws.ws_col != newws.ws_col ||
451: oldws.ws_xpixel != newws.ws_xpixel ||
452: oldws.ws_ypixel != newws.ws_ypixel))
453: received_window_change_signal = 1;
454:
455: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 456: buffer_init(bin);
457: buffer_init(bout);
458: buffer_init(berr);
1.11 markus 459:
460: enter_raw_mode();
461: }
462:
1.20 markus 463: void
1.17 markus 464: client_process_net_input(fd_set * readset)
1.11 markus 465: {
1.17 markus 466: int len;
467: char buf[8192];
1.11 markus 468:
1.13 markus 469: /*
470: * Read input from the server, and add any such data to the buffer of
471: * the packet subsystem.
472: */
1.11 markus 473: if (FD_ISSET(connection_in, readset)) {
474: /* Read as much as possible. */
475: len = read(connection_in, buf, sizeof(buf));
476: if (len == 0) {
477: /* Received EOF. The remote host has closed the connection. */
478: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
479: host);
1.1 deraadt 480: buffer_append(&stderr_buffer, buf, strlen(buf));
481: stderr_bytes += strlen(buf);
482: quit_pending = 1;
483: return;
1.11 markus 484: }
1.13 markus 485: /*
486: * There is a kernel bug on Solaris that causes select to
487: * sometimes wake up even though there is no data available.
488: */
1.11 markus 489: if (len < 0 && errno == EAGAIN)
490: len = 0;
491:
492: if (len < 0) {
493: /* An error has encountered. Perhaps there is a network problem. */
494: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
495: host, strerror(errno));
496: buffer_append(&stderr_buffer, buf, strlen(buf));
497: stderr_bytes += strlen(buf);
498: quit_pending = 1;
499: return;
500: }
501: packet_process_incoming(buf, len);
502: }
1.17 markus 503: }
1.16 markus 504:
1.31 markus 505: /* process the characters one by one */
506: int
507: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
508: {
1.32 markus 509: char string[1024];
1.31 markus 510: pid_t pid;
511: int bytes = 0;
1.42 markus 512: u_int i;
513: u_char ch;
1.31 markus 514: char *s;
515:
516: for (i = 0; i < len; i++) {
517: /* Get one character at a time. */
518: ch = buf[i];
519:
520: if (escape_pending) {
521: /* We have previously seen an escape character. */
522: /* Clear the flag now. */
523: escape_pending = 0;
524:
525: /* Process the escaped character. */
526: switch (ch) {
527: case '.':
528: /* Terminate the connection. */
1.32 markus 529: snprintf(string, sizeof string, "%c.\r\n", escape_char);
530: buffer_append(berr, string, strlen(string));
531: /*stderr_bytes += strlen(string); XXX*/
1.31 markus 532:
533: quit_pending = 1;
534: return -1;
535:
536: case 'Z' - 64:
537: /* Suspend the program. */
538: /* Print a message to that effect to the user. */
1.32 markus 539: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
540: buffer_append(berr, string, strlen(string));
541: /*stderr_bytes += strlen(string); XXX*/
1.31 markus 542:
543: /* Restore terminal modes and suspend. */
544: client_suspend_self(bin, bout, berr);
545:
546: /* We have been continued. */
547: continue;
548:
549: case '&':
550: /* XXX does not work yet with proto 2 */
551: if (compat20)
552: continue;
553: /*
554: * Detach the program (continue to serve connections,
555: * but put in background and no more new connections).
556: */
557: if (!stdin_eof) {
558: /*
559: * Sending SSH_CMSG_EOF alone does not always appear
560: * to be enough. So we try to send an EOF character
561: * first.
562: */
563: packet_start(SSH_CMSG_STDIN_DATA);
564: packet_put_string("\004", 1);
565: packet_send();
566: /* Close stdin. */
567: stdin_eof = 1;
568: if (buffer_len(bin) == 0) {
569: packet_start(SSH_CMSG_EOF);
570: packet_send();
571: }
572: }
573: /* Restore tty modes. */
574: leave_raw_mode();
575:
576: /* Stop listening for new connections. */
577: channel_stop_listening();
578:
579: printf("%c& [backgrounded]\n", escape_char);
580:
581: /* Fork into background. */
582: pid = fork();
583: if (pid < 0) {
584: error("fork: %.100s", strerror(errno));
585: continue;
586: }
587: if (pid != 0) { /* This is the parent. */
588: /* The parent just exits. */
589: exit(0);
590: }
591: /* The child continues serving connections. */
592: continue; /*XXX ? */
593:
594: case '?':
1.32 markus 595: snprintf(string, sizeof string,
1.31 markus 596: "%c?\r\n\
597: Supported escape sequences:\r\n\
598: ~. - terminate connection\r\n\
599: ~^Z - suspend ssh\r\n\
600: ~# - list forwarded connections\r\n\
601: ~& - background ssh (when waiting for connections to terminate)\r\n\
602: ~? - this message\r\n\
603: ~~ - send the escape character by typing it twice\r\n\
604: (Note that escapes are only recognized immediately after newline.)\r\n",
605: escape_char);
1.32 markus 606: buffer_append(berr, string, strlen(string));
1.31 markus 607: continue;
608:
609: case '#':
1.32 markus 610: snprintf(string, sizeof string, "%c#\r\n", escape_char);
611: buffer_append(berr, string, strlen(string));
1.31 markus 612: s = channel_open_message();
613: buffer_append(berr, s, strlen(s));
614: xfree(s);
615: continue;
616:
617: default:
618: if (ch != escape_char) {
619: buffer_put_char(bin, escape_char);
620: bytes++;
621: }
622: /* Escaped characters fall through here */
623: break;
624: }
625: } else {
626: /*
627: * The previous character was not an escape char. Check if this
628: * is an escape.
629: */
630: if (last_was_cr && ch == escape_char) {
631: /* It is. Set the flag and continue to next character. */
632: escape_pending = 1;
633: continue;
634: }
635: }
636:
637: /*
638: * Normal character. Record whether it was a newline,
639: * and append it to the buffer.
640: */
641: last_was_cr = (ch == '\r' || ch == '\n');
642: buffer_put_char(bin, ch);
643: bytes++;
644: }
645: return bytes;
646: }
647:
1.20 markus 648: void
1.17 markus 649: client_process_input(fd_set * readset)
650: {
1.31 markus 651: int ret;
1.21 deraadt 652: int len;
1.31 markus 653: char buf[8192];
1.16 markus 654:
1.11 markus 655: /* Read input from stdin. */
656: if (FD_ISSET(fileno(stdin), readset)) {
657: /* Read as much as possible. */
658: len = read(fileno(stdin), buf, sizeof(buf));
659: if (len <= 0) {
1.13 markus 660: /*
661: * Received EOF or error. They are treated
662: * similarly, except that an error message is printed
663: * if it was an error condition.
664: */
1.11 markus 665: if (len < 0) {
666: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
667: buffer_append(&stderr_buffer, buf, strlen(buf));
668: stderr_bytes += strlen(buf);
669: }
670: /* Mark that we have seen EOF. */
671: stdin_eof = 1;
1.13 markus 672: /*
673: * Send an EOF message to the server unless there is
674: * data in the buffer. If there is data in the
675: * buffer, no message will be sent now. Code
676: * elsewhere will send the EOF when the buffer
677: * becomes empty if stdin_eof is set.
678: */
1.11 markus 679: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 680: packet_start(SSH_CMSG_EOF);
681: packet_send();
1.11 markus 682: }
683: } else if (escape_char == -1) {
1.13 markus 684: /*
685: * Normal successful read, and no escape character.
686: * Just append the data to buffer.
687: */
1.11 markus 688: buffer_append(&stdin_buffer, buf, len);
689: stdin_bytes += len;
690: } else {
1.13 markus 691: /*
692: * Normal, successful read. But we have an escape character
693: * and have to process the characters one by one.
694: */
1.31 markus 695: ret = process_escapes(&stdin_buffer, &stdout_buffer, &stderr_buffer, buf, len);
696: if (ret == -1)
697: return;
698: stdout_bytes += ret;
1.11 markus 699: }
700: }
701: }
702:
1.20 markus 703: void
1.11 markus 704: client_process_output(fd_set * writeset)
705: {
706: int len;
707: char buf[100];
1.1 deraadt 708:
1.11 markus 709: /* Write buffered output to stdout. */
710: if (FD_ISSET(fileno(stdout), writeset)) {
711: /* Write as much data as possible. */
712: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 713: buffer_len(&stdout_buffer));
1.11 markus 714: if (len <= 0) {
715: if (errno == EAGAIN)
716: len = 0;
717: else {
1.13 markus 718: /*
719: * An error or EOF was encountered. Put an
720: * error message to stderr buffer.
721: */
1.11 markus 722: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
723: buffer_append(&stderr_buffer, buf, strlen(buf));
724: stderr_bytes += strlen(buf);
725: quit_pending = 1;
726: return;
727: }
728: }
729: /* Consume printed data from the buffer. */
730: buffer_consume(&stdout_buffer, len);
731: }
732: /* Write buffered output to stderr. */
733: if (FD_ISSET(fileno(stderr), writeset)) {
734: /* Write as much data as possible. */
735: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 736: buffer_len(&stderr_buffer));
1.11 markus 737: if (len <= 0) {
738: if (errno == EAGAIN)
739: len = 0;
740: else {
1.13 markus 741: /* EOF or error, but can't even print error message. */
1.11 markus 742: quit_pending = 1;
743: return;
744: }
745: }
746: /* Consume printed characters from the buffer. */
747: buffer_consume(&stderr_buffer, len);
748: }
1.1 deraadt 749: }
750:
1.13 markus 751: /*
1.15 markus 752: * Get packets from the connection input buffer, and process them as long as
753: * there are packets available.
754: *
755: * Any unknown packets received during the actual
756: * session cause the session to terminate. This is
757: * intended to make debugging easier since no
758: * confirmations are sent. Any compatible protocol
759: * extensions must be negotiated during the
760: * preparatory phase.
761: */
762:
1.20 markus 763: void
1.15 markus 764: client_process_buffered_input_packets()
765: {
1.36 markus 766: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL);
1.15 markus 767: }
768:
1.31 markus 769: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 770:
771: int
1.31 markus 772: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 773: {
1.31 markus 774: /* XXX we assume c->extended is writeable */
775: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 776: }
777:
1.15 markus 778: /*
1.13 markus 779: * Implements the interactive session with the server. This is called after
780: * the user has been authenticated, and a command has been started on the
781: * remote host. If escape_char != -1, it is the character used as an escape
782: * character for terminating or suspending the session.
783: */
1.1 deraadt 784:
1.20 markus 785: int
1.30 markus 786: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 787: {
1.46 ! markus 788: fd_set *readset = NULL, *writeset = NULL;
! 789: int max_fd = 0;
1.11 markus 790: double start_time, total_time;
791: int len;
792: char buf[100];
793:
794: debug("Entering interactive session.");
795:
796: start_time = get_current_time();
797:
798: /* Initialize variables. */
799: escape_pending = 0;
800: last_was_cr = 1;
801: exit_status = -1;
802: stdin_eof = 0;
803: buffer_high = 64 * 1024;
804: connection_in = packet_get_connection_in();
805: connection_out = packet_get_connection_out();
1.46 ! markus 806: max_fd = MAX(connection_in, connection_out);
! 807:
! 808: if (!compat20) {
! 809: max_fd = MAX(max_fd, fileno(stdin));
! 810: max_fd = MAX(max_fd, fileno(stdout));
! 811: max_fd = MAX(max_fd, fileno(stderr));
! 812: }
1.11 markus 813: stdin_bytes = 0;
814: stdout_bytes = 0;
815: stderr_bytes = 0;
816: quit_pending = 0;
817: escape_char = escape_char_arg;
818:
819: /* Initialize buffers. */
820: buffer_init(&stdin_buffer);
821: buffer_init(&stdout_buffer);
822: buffer_init(&stderr_buffer);
823:
1.15 markus 824: client_init_dispatch();
825:
1.11 markus 826: /* Set signal handlers to restore non-blocking mode. */
827: signal(SIGINT, signal_handler);
828: signal(SIGQUIT, signal_handler);
829: signal(SIGTERM, signal_handler);
830: signal(SIGPIPE, SIG_IGN);
831: if (have_pty)
832: signal(SIGWINCH, window_change_handler);
833:
834: if (have_pty)
835: enter_raw_mode();
836:
1.28 provos 837: /* Check if we should immediately send eof on stdin. */
1.17 markus 838: if (!compat20)
1.16 markus 839: client_check_initial_eof_on_stdin();
1.11 markus 840:
1.30 markus 841: if (compat20 && escape_char != -1)
842: channel_register_filter(ssh2_chan_id, simple_escape_filter);
843:
1.11 markus 844: /* Main loop of the client for the interactive session mode. */
845: while (!quit_pending) {
846:
1.13 markus 847: /* Process buffered packets sent by the server. */
1.11 markus 848: client_process_buffered_input_packets();
849:
1.16 markus 850: if (compat20 && !channel_still_open()) {
1.37 markus 851: debug2("!channel_still_open.");
1.16 markus 852: break;
853: }
854:
1.13 markus 855: /*
856: * Make packets of buffered stdin data, and buffer them for
857: * sending to the server.
858: */
1.17 markus 859: if (!compat20)
1.16 markus 860: client_make_packets_from_stdin_data();
1.11 markus 861:
1.13 markus 862: /*
1.46 ! markus 863: * Make packets from buffered channel data, and enqueue them
1.13 markus 864: * for sending to the server.
865: */
1.11 markus 866: if (packet_not_very_much_data_to_write())
867: channel_output_poll();
868:
1.13 markus 869: /*
870: * Check if the window size has changed, and buffer a message
871: * about it to the server if so.
872: */
1.11 markus 873: client_check_window_change();
874:
875: if (quit_pending)
876: break;
877:
1.13 markus 878: /*
879: * Wait until we have something to do (something becomes
880: * available on one of the descriptors).
881: */
1.46 ! markus 882: client_wait_until_can_do_something(&readset, &writeset, &max_fd);
1.11 markus 883:
884: if (quit_pending)
885: break;
886:
887: /* Do channel operations. */
1.46 ! markus 888: channel_after_select(readset, writeset);
1.11 markus 889:
1.17 markus 890: /* Buffer input from the connection. */
1.46 ! markus 891: client_process_net_input(readset);
1.17 markus 892:
893: if (quit_pending)
894: break;
1.11 markus 895:
1.17 markus 896: if (!compat20) {
897: /* Buffer data from stdin */
1.46 ! markus 898: client_process_input(readset);
1.17 markus 899: /*
900: * Process output to stdout and stderr. Output to
901: * the connection is processed elsewhere (above).
902: */
1.46 ! markus 903: client_process_output(writeset);
1.17 markus 904: }
1.11 markus 905:
1.13 markus 906: /* Send as much buffered packet data as possible to the sender. */
1.46 ! markus 907: if (FD_ISSET(connection_out, writeset))
1.11 markus 908: packet_write_poll();
909: }
1.46 ! markus 910: if (readset)
! 911: xfree(readset);
! 912: if (writeset)
! 913: xfree(writeset);
1.11 markus 914:
915: /* Terminate the session. */
916:
917: /* Stop watching for window change. */
918: if (have_pty)
919: signal(SIGWINCH, SIG_DFL);
920:
921: /* Stop listening for connections. */
922: channel_stop_listening();
923:
1.13 markus 924: /*
925: * In interactive mode (with pseudo tty) display a message indicating
926: * that the connection has been closed.
927: */
1.11 markus 928: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
929: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
930: buffer_append(&stderr_buffer, buf, strlen(buf));
931: stderr_bytes += strlen(buf);
932: }
933: /* Output any buffered data for stdout. */
934: while (buffer_len(&stdout_buffer) > 0) {
935: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 936: buffer_len(&stdout_buffer));
1.11 markus 937: if (len <= 0) {
938: error("Write failed flushing stdout buffer.");
939: break;
940: }
941: buffer_consume(&stdout_buffer, len);
942: }
943:
944: /* Output any buffered data for stderr. */
945: while (buffer_len(&stderr_buffer) > 0) {
946: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 947: buffer_len(&stderr_buffer));
1.11 markus 948: if (len <= 0) {
949: error("Write failed flushing stderr buffer.");
950: break;
951: }
952: buffer_consume(&stderr_buffer, len);
953: }
954:
955: if (have_pty)
956: leave_raw_mode();
957:
958: /* Clear and free any buffers. */
959: memset(buf, 0, sizeof(buf));
960: buffer_free(&stdin_buffer);
961: buffer_free(&stdout_buffer);
962: buffer_free(&stderr_buffer);
963:
964: /* Report bytes transferred, and transfer rates. */
965: total_time = get_current_time() - start_time;
966: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
967: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
968: if (total_time > 0)
969: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
970: stdin_bytes / total_time, stdout_bytes / total_time,
971: stderr_bytes / total_time);
972:
973: /* Return the exit status of the program. */
974: debug("Exit status %d", exit_status);
975: return exit_status;
1.15 markus 976: }
977:
978: /*********/
979:
980: void
1.36 markus 981: client_input_stdout_data(int type, int plen, void *ctxt)
1.15 markus 982: {
1.42 markus 983: u_int data_len;
1.15 markus 984: char *data = packet_get_string(&data_len);
985: packet_integrity_check(plen, 4 + data_len, type);
986: buffer_append(&stdout_buffer, data, data_len);
987: stdout_bytes += data_len;
988: memset(data, 0, data_len);
989: xfree(data);
990: }
991: void
1.36 markus 992: client_input_stderr_data(int type, int plen, void *ctxt)
1.15 markus 993: {
1.42 markus 994: u_int data_len;
1.15 markus 995: char *data = packet_get_string(&data_len);
996: packet_integrity_check(plen, 4 + data_len, type);
997: buffer_append(&stderr_buffer, data, data_len);
998: stdout_bytes += data_len;
999: memset(data, 0, data_len);
1000: xfree(data);
1001: }
1002: void
1.36 markus 1003: client_input_exit_status(int type, int plen, void *ctxt)
1.15 markus 1004: {
1005: packet_integrity_check(plen, 4, type);
1006: exit_status = packet_get_int();
1007: /* Acknowledge the exit. */
1008: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1009: packet_send();
1010: /*
1011: * Must wait for packet to be sent since we are
1012: * exiting the loop.
1013: */
1014: packet_write_wait();
1015: /* Flag that we want to exit. */
1016: quit_pending = 1;
1017: }
1018:
1.40 markus 1019: Channel *
1020: client_request_forwarded_tcpip(const char *request_type, int rchan)
1021: {
1022: Channel* c = NULL;
1023: char *listen_address, *originator_address;
1024: int listen_port, originator_port;
1025: int sock, newch;
1026:
1027: /* Get rest of the packet */
1028: listen_address = packet_get_string(NULL);
1029: listen_port = packet_get_int();
1030: originator_address = packet_get_string(NULL);
1031: originator_port = packet_get_int();
1032: packet_done();
1033:
1034: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1035: listen_address, listen_port, originator_address, originator_port);
1036:
1037: sock = channel_connect_by_listen_adress(listen_port);
1038: if (sock >= 0) {
1039: newch = channel_new("forwarded-tcpip",
1.41 markus 1040: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1.40 markus 1041: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1042: xstrdup(originator_address), 1);
1043: c = channel_lookup(newch);
1044: }
1045: xfree(originator_address);
1046: xfree(listen_address);
1047: return c;
1048: }
1049:
1050: Channel*
1051: client_request_x11(const char *request_type, int rchan)
1052: {
1053: Channel *c = NULL;
1054: char *originator;
1055: int originator_port;
1056: int sock, newch;
1057:
1058: if (!options.forward_x11) {
1059: error("Warning: ssh server tried X11 forwarding.");
1060: error("Warning: this is probably a break in attempt by a malicious server.");
1061: return NULL;
1062: }
1063: originator = packet_get_string(NULL);
1064: if (datafellows & SSH_BUG_X11FWD) {
1065: debug2("buggy server: x11 request w/o originator_port");
1066: originator_port = 0;
1067: } else {
1068: originator_port = packet_get_int();
1069: }
1070: packet_done();
1071: /* XXX check permission */
1072: sock = x11_connect_display();
1073: if (sock >= 0) {
1074: newch = channel_new("x11",
1075: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1076: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
1077: xstrdup("x11"), 1);
1078: c = channel_lookup(newch);
1079: }
1080: xfree(originator);
1081: return c;
1082: }
1083:
1084: Channel*
1085: client_request_agent(const char *request_type, int rchan)
1086: {
1087: Channel *c = NULL;
1088: int sock, newch;
1089:
1090: if (!options.forward_agent) {
1091: error("Warning: ssh server tried agent forwarding.");
1092: error("Warning: this is probably a break in attempt by a malicious server.");
1093: return NULL;
1094: }
1095: sock = ssh_get_authentication_socket();
1096: if (sock >= 0) {
1097: newch = channel_new("authentication agent connection",
1098: SSH_CHANNEL_OPEN, sock, sock, -1,
1099: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1100: xstrdup("authentication agent connection"), 1);
1101: c = channel_lookup(newch);
1102: }
1103: return c;
1104: }
1105:
1.22 markus 1106: /* XXXX move to generic input handler */
1107: void
1.36 markus 1108: client_input_channel_open(int type, int plen, void *ctxt)
1.22 markus 1109: {
1110: Channel *c = NULL;
1111: char *ctype;
1.42 markus 1112: u_int len;
1.22 markus 1113: int rchan;
1114: int rmaxpack;
1115: int rwindow;
1116:
1117: ctype = packet_get_string(&len);
1118: rchan = packet_get_int();
1119: rwindow = packet_get_int();
1120: rmaxpack = packet_get_int();
1121:
1.24 markus 1122: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1123: ctype, rchan, rwindow, rmaxpack);
1124:
1.40 markus 1125: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1126: c = client_request_forwarded_tcpip(ctype, rchan);
1127: } else if (strcmp(ctype, "x11") == 0) {
1128: c = client_request_x11(ctype, rchan);
1129: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1130: c = client_request_agent(ctype, rchan);
1.22 markus 1131: }
1132: /* XXX duplicate : */
1133: if (c != NULL) {
1134: debug("confirm %s", ctype);
1135: c->remote_id = rchan;
1136: c->remote_window = rwindow;
1137: c->remote_maxpacket = rmaxpack;
1138:
1139: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1140: packet_put_int(c->remote_id);
1141: packet_put_int(c->self);
1142: packet_put_int(c->local_window);
1143: packet_put_int(c->local_maxpacket);
1144: packet_send();
1145: } else {
1146: debug("failure %s", ctype);
1147: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1148: packet_put_int(rchan);
1149: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1150: packet_put_cstring("bla bla");
1151: packet_put_cstring("");
1152: packet_send();
1153: }
1154: xfree(ctype);
1155: }
1156:
1.20 markus 1157: void
1.16 markus 1158: client_init_dispatch_20()
1159: {
1160: dispatch_init(&dispatch_protocol_error);
1161: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1162: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1163: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1164: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1165: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1166: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1167: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1168: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request);
1169: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1170: }
1.20 markus 1171: void
1.15 markus 1172: client_init_dispatch_13()
1173: {
1174: dispatch_init(NULL);
1175: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1176: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1177: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1178: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1179: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1180: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1181: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1182: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1183: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1184:
1185: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1186: &auth_input_open_request : &deny_input_open);
1187: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1188: &x11_input_open : &deny_input_open);
1.15 markus 1189: }
1.20 markus 1190: void
1.15 markus 1191: client_init_dispatch_15()
1192: {
1193: client_init_dispatch_13();
1194: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1195: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1196: }
1.20 markus 1197: void
1.15 markus 1198: client_init_dispatch()
1199: {
1.16 markus 1200: if (compat20)
1201: client_init_dispatch_20();
1202: else if (compat13)
1.15 markus 1203: client_init_dispatch_13();
1204: else
1205: client_init_dispatch_15();
1.16 markus 1206: }
1207:
1208: void
1209: client_input_channel_req(int id, void *arg)
1210: {
1211: Channel *c = NULL;
1.42 markus 1212: u_int len;
1.16 markus 1213: int success = 0;
1214: int reply;
1215: char *rtype;
1216:
1217: rtype = packet_get_string(&len);
1218: reply = packet_get_char();
1219:
1.23 markus 1220: debug("client_input_channel_req: rtype %s reply %d", rtype, reply);
1.16 markus 1221:
1222: c = channel_lookup(id);
1223: if (c == NULL)
1.35 markus 1224: fatal("client_input_channel_req: channel %d: bad channel", id);
1.16 markus 1225:
1226: if (session_ident == -1) {
1227: error("client_input_channel_req: no channel %d", id);
1228: } else if (id != session_ident) {
1229: error("client_input_channel_req: bad channel %d != %d",
1230: id, session_ident);
1231: } else if (strcmp(rtype, "exit-status") == 0) {
1232: success = 1;
1233: exit_status = packet_get_int();
1.19 markus 1234: packet_done();
1.16 markus 1235: }
1236: if (reply) {
1237: packet_start(success ?
1238: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1239: packet_put_int(c->remote_id);
1240: packet_send();
1241: }
1242: xfree(rtype);
1243: }
1244:
1245: void
1.43 markus 1246: clientloop_set_session_ident(int id)
1.16 markus 1247: {
1.43 markus 1248: debug2("clientloop_set_session_ident: id %d", id);
1.16 markus 1249: session_ident = id;
1250: channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST,
1251: client_input_channel_req, (void *)0);
1.1 deraadt 1252: }