Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.39.2.5
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.
1.39.2.5! miod 38: * Copyright (c) 1999, 2000, 2001 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"
1.39.2.5! miod 62: RCSID("$OpenBSD: clientloop.c,v 1.82 2001/09/17 20:52:47 markus Exp $");
1.1 deraadt 63:
64: #include "ssh.h"
1.39.2.1 jason 65: #include "ssh1.h"
66: #include "ssh2.h"
67: #include "xmalloc.h"
1.1 deraadt 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"
1.39.2.1 jason 75: #include "key.h"
1.39.2.4 jason 76: #include "kex.h"
1.39.2.1 jason 77: #include "log.h"
78: #include "readconf.h"
79: #include "clientloop.h"
80: #include "authfd.h"
81: #include "atomicio.h"
1.39.2.4 jason 82: #include "sshtty.h"
83: #include "misc.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;
1.39.2.5! miod 105: static volatile int received_signal = 0;
1.1 deraadt 106:
107: /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
108: static int in_non_blocking_mode = 0;
109:
110: /* Common data for the client loop code. */
1.31 markus 111: static int quit_pending; /* Set to non-zero to quit the client loop. */
112: static int escape_char; /* Escape character. */
1.11 markus 113: static int escape_pending; /* Last character was the escape character */
114: static int last_was_cr; /* Last character was a newline. */
115: static int exit_status; /* Used to store the exit status of the command. */
116: static int stdin_eof; /* EOF has been encountered on standard error. */
117: static Buffer stdin_buffer; /* Buffer for stdin data. */
118: static Buffer stdout_buffer; /* Buffer for stdout data. */
119: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.39.2.1 jason 120: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
121: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 122: static int connection_in; /* Connection to server (input). */
123: static int connection_out; /* Connection to server (output). */
1.39.2.4 jason 124: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
125: static int session_closed = 0; /* In SSH2: login session closed. */
1.1 deraadt 126:
1.39.2.5! miod 127: static void client_init_dispatch(void);
1.16 markus 128: int session_ident = -1;
129:
1.39.2.4 jason 130: /*XXX*/
131: extern Kex *xxx_kex;
1.1 deraadt 132:
133: /* Restores stdin to blocking mode. */
134:
1.39.2.5! miod 135: static void
1.39.2.1 jason 136: leave_non_blocking(void)
1.1 deraadt 137: {
1.11 markus 138: if (in_non_blocking_mode) {
139: (void) fcntl(fileno(stdin), F_SETFL, 0);
140: in_non_blocking_mode = 0;
141: fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL);
142: }
1.1 deraadt 143: }
144:
1.11 markus 145: /* Puts stdin terminal in non-blocking mode. */
146:
1.39.2.5! miod 147: static void
1.39.2.1 jason 148: enter_non_blocking(void)
1.1 deraadt 149: {
1.11 markus 150: in_non_blocking_mode = 1;
151: (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
152: fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL);
1.1 deraadt 153: }
154:
1.13 markus 155: /*
156: * Signal handler for the window change signal (SIGWINCH). This just sets a
157: * flag indicating that the window has changed.
158: */
1.1 deraadt 159:
1.39.2.5! miod 160: static void
1.11 markus 161: window_change_handler(int sig)
1.1 deraadt 162: {
1.11 markus 163: received_window_change_signal = 1;
164: signal(SIGWINCH, window_change_handler);
1.1 deraadt 165: }
166:
1.13 markus 167: /*
168: * Signal handler for signals that cause the program to terminate. These
169: * signals must be trapped to restore terminal modes.
170: */
1.1 deraadt 171:
1.39.2.5! miod 172: static void
1.11 markus 173: signal_handler(int sig)
1.1 deraadt 174: {
1.39.2.5! miod 175: received_signal = sig;
! 176: quit_pending = 1;
1.1 deraadt 177: }
178:
1.13 markus 179: /*
180: * Returns current time in seconds from Jan 1, 1970 with the maximum
181: * available resolution.
182: */
1.1 deraadt 183:
1.39.2.5! miod 184: static double
1.39.2.1 jason 185: get_current_time(void)
1.1 deraadt 186: {
1.11 markus 187: struct timeval tv;
188: gettimeofday(&tv, NULL);
189: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.1 deraadt 190: }
191:
1.13 markus 192: /*
193: * This is called when the interactive is entered. This checks if there is
194: * an EOF coming on stdin. We must check this explicitly, as select() does
195: * not appear to wake up when redirecting from /dev/null.
196: */
1.1 deraadt 197:
1.39.2.5! miod 198: static void
1.39.2.1 jason 199: client_check_initial_eof_on_stdin(void)
1.1 deraadt 200: {
1.11 markus 201: int len;
202: char buf[1];
1.1 deraadt 203:
1.13 markus 204: /*
205: * If standard input is to be "redirected from /dev/null", we simply
206: * mark that we have seen an EOF and send an EOF message to the
207: * server. Otherwise, we try to read a single character; it appears
208: * that for some files, such /dev/null, select() never wakes up for
209: * read for this descriptor, which means that we never get EOF. This
210: * way we will get the EOF if stdin comes from /dev/null or similar.
211: */
1.11 markus 212: if (stdin_null_flag) {
213: /* Fake EOF on stdin. */
214: debug("Sending eof.");
215: stdin_eof = 1;
216: packet_start(SSH_CMSG_EOF);
217: packet_send();
218: } else {
219: enter_non_blocking();
220:
221: /* Check for immediate EOF on stdin. */
222: len = read(fileno(stdin), buf, 1);
223: if (len == 0) {
1.13 markus 224: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 225: debug("Sending eof.");
226: stdin_eof = 1;
227: packet_start(SSH_CMSG_EOF);
228: packet_send();
229: } else if (len > 0) {
1.13 markus 230: /*
231: * Got data. We must store the data in the buffer,
232: * and also process it as an escape character if
233: * appropriate.
234: */
1.39.2.1 jason 235: if ((u_char) buf[0] == escape_char)
1.11 markus 236: escape_pending = 1;
1.39.2.3 jason 237: else
1.11 markus 238: buffer_append(&stdin_buffer, buf, 1);
239: }
240: leave_non_blocking();
241: }
1.1 deraadt 242: }
243:
244:
1.13 markus 245: /*
246: * Make packets from buffered stdin data, and buffer them for sending to the
247: * connection.
248: */
1.1 deraadt 249:
1.39.2.5! miod 250: static void
1.39.2.1 jason 251: client_make_packets_from_stdin_data(void)
1.1 deraadt 252: {
1.39.2.1 jason 253: u_int len;
1.1 deraadt 254:
1.11 markus 255: /* Send buffered stdin data to the server. */
256: while (buffer_len(&stdin_buffer) > 0 &&
257: packet_not_very_much_data_to_write()) {
258: len = buffer_len(&stdin_buffer);
259: /* Keep the packets at reasonable size. */
260: if (len > packet_get_maxsize())
261: len = packet_get_maxsize();
262: packet_start(SSH_CMSG_STDIN_DATA);
263: packet_put_string(buffer_ptr(&stdin_buffer), len);
264: packet_send();
265: buffer_consume(&stdin_buffer, len);
1.39.2.3 jason 266: stdin_bytes += len;
1.11 markus 267: /* If we have a pending EOF, send it now. */
268: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
269: packet_start(SSH_CMSG_EOF);
270: packet_send();
271: }
1.1 deraadt 272: }
273: }
274:
1.13 markus 275: /*
276: * Checks if the client window has changed, and sends a packet about it to
277: * the server if so. The actual change is detected elsewhere (by a software
278: * interrupt on Unix); this just checks the flag and sends a message if
279: * appropriate.
280: */
1.1 deraadt 281:
1.39.2.5! miod 282: static void
1.39.2.1 jason 283: client_check_window_change(void)
1.1 deraadt 284: {
1.16 markus 285: struct winsize ws;
286:
287: if (! received_window_change_signal)
288: return;
289: /** XXX race */
290: received_window_change_signal = 0;
291:
292: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
293: return;
294:
1.37 markus 295: debug2("client_check_window_change: changed");
1.16 markus 296:
297: if (compat20) {
298: channel_request_start(session_ident, "window-change", 0);
299: packet_put_int(ws.ws_col);
300: packet_put_int(ws.ws_row);
301: packet_put_int(ws.ws_xpixel);
302: packet_put_int(ws.ws_ypixel);
303: packet_send();
304: } else {
305: packet_start(SSH_CMSG_WINDOW_SIZE);
306: packet_put_int(ws.ws_row);
307: packet_put_int(ws.ws_col);
308: packet_put_int(ws.ws_xpixel);
309: packet_put_int(ws.ws_ypixel);
310: packet_send();
1.1 deraadt 311: }
312: }
313:
1.13 markus 314: /*
315: * Waits until the client can do something (some data becomes available on
316: * one of the file descriptors).
317: */
1.1 deraadt 318:
1.39.2.5! miod 319: static void
1.39.2.1 jason 320: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.39.2.5! miod 321: int *maxfdp, int *nallocp, int rekeying)
1.11 markus 322: {
1.39.2.1 jason 323: /* Add any selections by the channel mechanism. */
1.39.2.5! miod 324: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 325:
1.16 markus 326: if (!compat20) {
1.17 markus 327: /* Read from the connection, unless our buffers are full. */
1.16 markus 328: if (buffer_len(&stdout_buffer) < buffer_high &&
329: buffer_len(&stderr_buffer) < buffer_high &&
330: channel_not_very_much_buffered_data())
1.39.2.1 jason 331: FD_SET(connection_in, *readsetp);
1.17 markus 332: /*
333: * Read from stdin, unless we have seen EOF or have very much
334: * buffered data to send to the server.
335: */
336: if (!stdin_eof && packet_not_very_much_data_to_write())
1.39.2.1 jason 337: FD_SET(fileno(stdin), *readsetp);
1.17 markus 338:
339: /* Select stdout/stderr if have data in buffer. */
340: if (buffer_len(&stdout_buffer) > 0)
1.39.2.1 jason 341: FD_SET(fileno(stdout), *writesetp);
1.17 markus 342: if (buffer_len(&stderr_buffer) > 0)
1.39.2.1 jason 343: FD_SET(fileno(stderr), *writesetp);
1.16 markus 344: } else {
1.39.2.5! miod 345: /* channel_prepare_select could have closed the last channel */
! 346: if (session_closed && !channel_still_open()) {
! 347: if (!packet_have_data_to_write())
! 348: return;
! 349: } else {
! 350: FD_SET(connection_in, *readsetp);
! 351: }
1.16 markus 352: }
1.11 markus 353:
354: /* Select server connection if have data to write to the server. */
355: if (packet_have_data_to_write())
1.39.2.1 jason 356: FD_SET(connection_out, *writesetp);
1.11 markus 357:
1.13 markus 358: /*
359: * Wait for something to happen. This will suspend the process until
360: * some selected descriptor can be read, written, or has some other
361: * event pending. Note: if you want to implement SSH_MSG_IGNORE
362: * messages to fool traffic analysis, this might be the place to do
363: * it: just have a random timeout for the select, and send a random
364: * SSH_MSG_IGNORE packet when the timeout expires.
365: */
1.11 markus 366:
1.39.2.1 jason 367: if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
1.11 markus 368: char buf[100];
1.39.2.1 jason 369:
370: /*
371: * We have to clear the select masks, because we return.
372: * We have to return, because the mainloop checks for the flags
373: * set by the signal handlers.
374: */
375: memset(*readsetp, 0, *maxfdp);
376: memset(*writesetp, 0, *maxfdp);
377:
1.11 markus 378: if (errno == EINTR)
379: return;
380: /* Note: we might still have data in the buffers. */
381: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
382: buffer_append(&stderr_buffer, buf, strlen(buf));
383: quit_pending = 1;
384: }
385: }
386:
1.39.2.5! miod 387: static void
1.31 markus 388: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 389: {
1.11 markus 390: struct winsize oldws, newws;
391:
392: /* Flush stdout and stderr buffers. */
1.31 markus 393: if (buffer_len(bout) > 0)
394: atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
395: if (buffer_len(berr) > 0)
396: atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 397:
398: leave_raw_mode();
399:
1.13 markus 400: /*
401: * Free (and clear) the buffer to reduce the amount of data that gets
402: * written to swap.
403: */
1.31 markus 404: buffer_free(bin);
405: buffer_free(bout);
406: buffer_free(berr);
1.11 markus 407:
408: /* Save old window size. */
409: ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
410:
411: /* Send the suspend signal to the program itself. */
412: kill(getpid(), SIGTSTP);
413:
414: /* Check if the window size has changed. */
415: if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
416: (oldws.ws_row != newws.ws_row ||
417: oldws.ws_col != newws.ws_col ||
418: oldws.ws_xpixel != newws.ws_xpixel ||
419: oldws.ws_ypixel != newws.ws_ypixel))
420: received_window_change_signal = 1;
421:
422: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 423: buffer_init(bin);
424: buffer_init(bout);
425: buffer_init(berr);
1.11 markus 426:
427: enter_raw_mode();
428: }
429:
1.39.2.5! miod 430: static void
1.17 markus 431: client_process_net_input(fd_set * readset)
1.11 markus 432: {
1.17 markus 433: int len;
434: char buf[8192];
1.11 markus 435:
1.13 markus 436: /*
437: * Read input from the server, and add any such data to the buffer of
438: * the packet subsystem.
439: */
1.11 markus 440: if (FD_ISSET(connection_in, readset)) {
441: /* Read as much as possible. */
442: len = read(connection_in, buf, sizeof(buf));
443: if (len == 0) {
444: /* Received EOF. The remote host has closed the connection. */
445: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
446: host);
1.1 deraadt 447: buffer_append(&stderr_buffer, buf, strlen(buf));
448: quit_pending = 1;
449: return;
1.11 markus 450: }
1.13 markus 451: /*
452: * There is a kernel bug on Solaris that causes select to
453: * sometimes wake up even though there is no data available.
454: */
1.39.2.3 jason 455: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 456: len = 0;
457:
458: if (len < 0) {
459: /* An error has encountered. Perhaps there is a network problem. */
460: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
461: host, strerror(errno));
462: buffer_append(&stderr_buffer, buf, strlen(buf));
463: quit_pending = 1;
464: return;
465: }
466: packet_process_incoming(buf, len);
467: }
1.17 markus 468: }
1.16 markus 469:
1.31 markus 470: /* process the characters one by one */
1.39.2.5! miod 471: static int
1.31 markus 472: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
473: {
1.32 markus 474: char string[1024];
1.31 markus 475: pid_t pid;
476: int bytes = 0;
1.39.2.1 jason 477: u_int i;
478: u_char ch;
1.31 markus 479: char *s;
480:
481: for (i = 0; i < len; i++) {
482: /* Get one character at a time. */
483: ch = buf[i];
484:
485: if (escape_pending) {
486: /* We have previously seen an escape character. */
487: /* Clear the flag now. */
488: escape_pending = 0;
489:
490: /* Process the escaped character. */
491: switch (ch) {
492: case '.':
493: /* Terminate the connection. */
1.32 markus 494: snprintf(string, sizeof string, "%c.\r\n", escape_char);
495: buffer_append(berr, string, strlen(string));
1.31 markus 496:
497: quit_pending = 1;
498: return -1;
499:
500: case 'Z' - 64:
501: /* Suspend the program. */
502: /* Print a message to that effect to the user. */
1.32 markus 503: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
504: buffer_append(berr, string, strlen(string));
1.31 markus 505:
506: /* Restore terminal modes and suspend. */
507: client_suspend_self(bin, bout, berr);
508:
509: /* We have been continued. */
510: continue;
511:
1.39.2.4 jason 512: case 'R':
513: if (compat20) {
514: if (datafellows & SSH_BUG_NOREKEY)
515: log("Server does not support re-keying");
516: else
517: need_rekeying = 1;
518: }
519: continue;
520:
1.31 markus 521: case '&':
522: /* XXX does not work yet with proto 2 */
523: if (compat20)
524: continue;
525: /*
526: * Detach the program (continue to serve connections,
527: * but put in background and no more new connections).
528: */
529: if (!stdin_eof) {
530: /*
531: * Sending SSH_CMSG_EOF alone does not always appear
532: * to be enough. So we try to send an EOF character
533: * first.
534: */
535: packet_start(SSH_CMSG_STDIN_DATA);
536: packet_put_string("\004", 1);
537: packet_send();
538: /* Close stdin. */
539: stdin_eof = 1;
540: if (buffer_len(bin) == 0) {
541: packet_start(SSH_CMSG_EOF);
542: packet_send();
543: }
544: }
545: /* Restore tty modes. */
546: leave_raw_mode();
547:
548: /* Stop listening for new connections. */
1.39.2.5! miod 549: channel_close_all(); /* proto1 only XXXX */
1.31 markus 550:
551: printf("%c& [backgrounded]\n", escape_char);
552:
553: /* Fork into background. */
554: pid = fork();
555: if (pid < 0) {
556: error("fork: %.100s", strerror(errno));
557: continue;
558: }
559: if (pid != 0) { /* This is the parent. */
560: /* The parent just exits. */
561: exit(0);
562: }
563: /* The child continues serving connections. */
564: continue; /*XXX ? */
565:
566: case '?':
1.32 markus 567: snprintf(string, sizeof string,
1.31 markus 568: "%c?\r\n\
569: Supported escape sequences:\r\n\
570: ~. - terminate connection\r\n\
1.39.2.5! miod 571: ~R - Request rekey (SSH protocol 2 only)\r\n\
1.31 markus 572: ~^Z - suspend ssh\r\n\
573: ~# - list forwarded connections\r\n\
574: ~& - background ssh (when waiting for connections to terminate)\r\n\
575: ~? - this message\r\n\
576: ~~ - send the escape character by typing it twice\r\n\
577: (Note that escapes are only recognized immediately after newline.)\r\n",
578: escape_char);
1.32 markus 579: buffer_append(berr, string, strlen(string));
1.31 markus 580: continue;
581:
582: case '#':
1.32 markus 583: snprintf(string, sizeof string, "%c#\r\n", escape_char);
584: buffer_append(berr, string, strlen(string));
1.31 markus 585: s = channel_open_message();
586: buffer_append(berr, s, strlen(s));
587: xfree(s);
588: continue;
589:
590: default:
591: if (ch != escape_char) {
592: buffer_put_char(bin, escape_char);
593: bytes++;
594: }
595: /* Escaped characters fall through here */
596: break;
597: }
598: } else {
599: /*
600: * The previous character was not an escape char. Check if this
601: * is an escape.
602: */
603: if (last_was_cr && ch == escape_char) {
604: /* It is. Set the flag and continue to next character. */
605: escape_pending = 1;
606: continue;
607: }
608: }
609:
610: /*
611: * Normal character. Record whether it was a newline,
612: * and append it to the buffer.
613: */
614: last_was_cr = (ch == '\r' || ch == '\n');
615: buffer_put_char(bin, ch);
616: bytes++;
617: }
618: return bytes;
619: }
620:
1.39.2.5! miod 621: static void
1.17 markus 622: client_process_input(fd_set * readset)
623: {
1.21 deraadt 624: int len;
1.31 markus 625: char buf[8192];
1.16 markus 626:
1.11 markus 627: /* Read input from stdin. */
628: if (FD_ISSET(fileno(stdin), readset)) {
629: /* Read as much as possible. */
630: len = read(fileno(stdin), buf, sizeof(buf));
1.39.2.4 jason 631: if (len < 0 && (errno == EAGAIN || errno == EINTR))
632: return; /* we'll try again later */
1.11 markus 633: if (len <= 0) {
1.13 markus 634: /*
635: * Received EOF or error. They are treated
636: * similarly, except that an error message is printed
637: * if it was an error condition.
638: */
1.11 markus 639: if (len < 0) {
640: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
641: buffer_append(&stderr_buffer, buf, strlen(buf));
642: }
643: /* Mark that we have seen EOF. */
644: stdin_eof = 1;
1.13 markus 645: /*
646: * Send an EOF message to the server unless there is
647: * data in the buffer. If there is data in the
648: * buffer, no message will be sent now. Code
649: * elsewhere will send the EOF when the buffer
650: * becomes empty if stdin_eof is set.
651: */
1.11 markus 652: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 653: packet_start(SSH_CMSG_EOF);
654: packet_send();
1.11 markus 655: }
1.39.2.5! miod 656: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 657: /*
658: * Normal successful read, and no escape character.
659: * Just append the data to buffer.
660: */
1.11 markus 661: buffer_append(&stdin_buffer, buf, len);
662: } else {
1.13 markus 663: /*
664: * Normal, successful read. But we have an escape character
665: * and have to process the characters one by one.
666: */
1.39.2.3 jason 667: if (process_escapes(&stdin_buffer, &stdout_buffer,
668: &stderr_buffer, buf, len) == -1)
1.31 markus 669: return;
1.11 markus 670: }
671: }
672: }
673:
1.39.2.5! miod 674: static void
1.11 markus 675: client_process_output(fd_set * writeset)
676: {
677: int len;
678: char buf[100];
1.1 deraadt 679:
1.11 markus 680: /* Write buffered output to stdout. */
681: if (FD_ISSET(fileno(stdout), writeset)) {
682: /* Write as much data as possible. */
683: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 684: buffer_len(&stdout_buffer));
1.11 markus 685: if (len <= 0) {
1.39.2.4 jason 686: if (errno == EINTR || errno == EAGAIN)
1.11 markus 687: len = 0;
688: else {
1.13 markus 689: /*
690: * An error or EOF was encountered. Put an
691: * error message to stderr buffer.
692: */
1.11 markus 693: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
694: buffer_append(&stderr_buffer, buf, strlen(buf));
695: quit_pending = 1;
696: return;
697: }
698: }
699: /* Consume printed data from the buffer. */
700: buffer_consume(&stdout_buffer, len);
1.39.2.4 jason 701: stdout_bytes += len;
1.11 markus 702: }
703: /* Write buffered output to stderr. */
704: if (FD_ISSET(fileno(stderr), writeset)) {
705: /* Write as much data as possible. */
706: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 707: buffer_len(&stderr_buffer));
1.11 markus 708: if (len <= 0) {
1.39.2.4 jason 709: if (errno == EINTR || errno == EAGAIN)
1.11 markus 710: len = 0;
711: else {
1.13 markus 712: /* EOF or error, but can't even print error message. */
1.11 markus 713: quit_pending = 1;
714: return;
715: }
716: }
717: /* Consume printed characters from the buffer. */
718: buffer_consume(&stderr_buffer, len);
1.39.2.4 jason 719: stderr_bytes += len;
1.11 markus 720: }
1.1 deraadt 721: }
722:
1.13 markus 723: /*
1.15 markus 724: * Get packets from the connection input buffer, and process them as long as
725: * there are packets available.
726: *
727: * Any unknown packets received during the actual
728: * session cause the session to terminate. This is
729: * intended to make debugging easier since no
730: * confirmations are sent. Any compatible protocol
731: * extensions must be negotiated during the
732: * preparatory phase.
733: */
734:
1.39.2.5! miod 735: static void
1.39.2.1 jason 736: client_process_buffered_input_packets(void)
1.15 markus 737: {
1.39.2.4 jason 738: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 739: }
740:
1.31 markus 741: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 742:
1.39.2.5! miod 743: static int
1.31 markus 744: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 745: {
1.31 markus 746: /* XXX we assume c->extended is writeable */
747: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 748: }
749:
1.39.2.5! miod 750: static void
1.39.2.4 jason 751: client_channel_closed(int id, void *arg)
752: {
753: if (id != session_ident)
754: error("client_channel_closed: id %d != session_ident %d",
755: id, session_ident);
756: session_closed = 1;
757: if (in_raw_mode())
758: leave_raw_mode();
759: }
760:
1.15 markus 761: /*
1.13 markus 762: * Implements the interactive session with the server. This is called after
763: * the user has been authenticated, and a command has been started on the
1.39.2.5! miod 764: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
! 765: * used as an escape character for terminating or suspending the session.
1.13 markus 766: */
1.1 deraadt 767:
1.20 markus 768: int
1.30 markus 769: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 770: {
1.39.2.1 jason 771: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 772: double start_time, total_time;
1.39.2.5! miod 773: int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0;
1.11 markus 774: char buf[100];
775:
776: debug("Entering interactive session.");
777:
778: start_time = get_current_time();
779:
780: /* Initialize variables. */
781: escape_pending = 0;
782: last_was_cr = 1;
783: exit_status = -1;
784: stdin_eof = 0;
785: buffer_high = 64 * 1024;
786: connection_in = packet_get_connection_in();
787: connection_out = packet_get_connection_out();
1.39.2.1 jason 788: max_fd = MAX(connection_in, connection_out);
789:
790: if (!compat20) {
1.39.2.4 jason 791: /* enable nonblocking unless tty */
792: if (!isatty(fileno(stdin)))
793: set_nonblock(fileno(stdin));
794: if (!isatty(fileno(stdout)))
795: set_nonblock(fileno(stdout));
796: if (!isatty(fileno(stderr)))
797: set_nonblock(fileno(stderr));
1.39.2.1 jason 798: max_fd = MAX(max_fd, fileno(stdin));
799: max_fd = MAX(max_fd, fileno(stdout));
800: max_fd = MAX(max_fd, fileno(stderr));
801: }
1.11 markus 802: stdin_bytes = 0;
803: stdout_bytes = 0;
804: stderr_bytes = 0;
805: quit_pending = 0;
806: escape_char = escape_char_arg;
807:
808: /* Initialize buffers. */
809: buffer_init(&stdin_buffer);
810: buffer_init(&stdout_buffer);
811: buffer_init(&stderr_buffer);
812:
1.15 markus 813: client_init_dispatch();
814:
1.11 markus 815: /* Set signal handlers to restore non-blocking mode. */
816: signal(SIGINT, signal_handler);
817: signal(SIGQUIT, signal_handler);
818: signal(SIGTERM, signal_handler);
819: signal(SIGPIPE, SIG_IGN);
820: if (have_pty)
821: signal(SIGWINCH, window_change_handler);
822:
823: if (have_pty)
824: enter_raw_mode();
825:
1.39.2.1 jason 826: if (compat20) {
827: session_ident = ssh2_chan_id;
1.39.2.5! miod 828: if (escape_char != SSH_ESCAPECHAR_NONE)
1.39.2.1 jason 829: channel_register_filter(session_ident,
830: simple_escape_filter);
1.39.2.4 jason 831: if (session_ident != -1)
832: channel_register_cleanup(session_ident,
833: client_channel_closed);
1.39.2.1 jason 834: } else {
835: /* Check if we should immediately send eof on stdin. */
1.16 markus 836: client_check_initial_eof_on_stdin();
1.39.2.1 jason 837: }
1.30 markus 838:
1.11 markus 839: /* Main loop of the client for the interactive session mode. */
840: while (!quit_pending) {
841:
1.13 markus 842: /* Process buffered packets sent by the server. */
1.11 markus 843: client_process_buffered_input_packets();
844:
1.39.2.4 jason 845: if (compat20 && session_closed && !channel_still_open())
1.16 markus 846: break;
847:
1.39.2.4 jason 848: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.11 markus 849:
1.39.2.4 jason 850: if (rekeying) {
851: debug("rekeying in progress");
852: } else {
853: /*
854: * Make packets of buffered stdin data, and buffer
855: * them for sending to the server.
856: */
857: if (!compat20)
858: client_make_packets_from_stdin_data();
1.11 markus 859:
1.39.2.4 jason 860: /*
861: * Make packets from buffered channel data, and
862: * enqueue them for sending to the server.
863: */
864: if (packet_not_very_much_data_to_write())
865: channel_output_poll();
1.11 markus 866:
1.39.2.4 jason 867: /*
868: * Check if the window size has changed, and buffer a
869: * message about it to the server if so.
870: */
871: client_check_window_change();
1.11 markus 872:
1.39.2.4 jason 873: if (quit_pending)
874: break;
875: }
1.13 markus 876: /*
877: * Wait until we have something to do (something becomes
878: * available on one of the descriptors).
879: */
1.39.2.5! miod 880: max_fd2 = max_fd;
1.39.2.4 jason 881: client_wait_until_can_do_something(&readset, &writeset,
1.39.2.5! miod 882: &max_fd2, &nalloc, rekeying);
1.11 markus 883:
884: if (quit_pending)
885: break;
886:
1.39.2.4 jason 887: /* Do channel operations unless rekeying in progress. */
888: if (!rekeying) {
889: channel_after_select(readset, writeset);
890:
891: if (need_rekeying) {
892: debug("user requests rekeying");
893: xxx_kex->done = 0;
894: kex_send_kexinit(xxx_kex);
895: need_rekeying = 0;
896: }
897: }
1.11 markus 898:
1.17 markus 899: /* Buffer input from the connection. */
1.39.2.1 jason 900: client_process_net_input(readset);
1.17 markus 901:
902: if (quit_pending)
903: break;
1.11 markus 904:
1.17 markus 905: if (!compat20) {
906: /* Buffer data from stdin */
1.39.2.1 jason 907: client_process_input(readset);
1.17 markus 908: /*
909: * Process output to stdout and stderr. Output to
910: * the connection is processed elsewhere (above).
911: */
1.39.2.1 jason 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. */
1.39.2.1 jason 916: if (FD_ISSET(connection_out, writeset))
1.11 markus 917: packet_write_poll();
918: }
1.39.2.1 jason 919: if (readset)
920: xfree(readset);
921: if (writeset)
922: xfree(writeset);
1.11 markus 923:
924: /* Terminate the session. */
925:
926: /* Stop watching for window change. */
927: if (have_pty)
928: signal(SIGWINCH, SIG_DFL);
929:
1.39.2.5! miod 930: channel_free_all();
! 931:
! 932: if (have_pty)
! 933: leave_raw_mode();
! 934:
! 935: /* restore blocking io */
! 936: if (!isatty(fileno(stdin)))
! 937: unset_nonblock(fileno(stdin));
! 938: if (!isatty(fileno(stdout)))
! 939: unset_nonblock(fileno(stdout));
! 940: if (!isatty(fileno(stderr)))
! 941: unset_nonblock(fileno(stderr));
! 942:
! 943: if (received_signal) {
! 944: if (in_non_blocking_mode) /* XXX */
! 945: leave_non_blocking();
! 946: fatal("Killed by signal %d.", received_signal);
! 947: }
1.11 markus 948:
1.13 markus 949: /*
950: * In interactive mode (with pseudo tty) display a message indicating
951: * that the connection has been closed.
952: */
1.11 markus 953: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
954: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
955: buffer_append(&stderr_buffer, buf, strlen(buf));
956: }
1.39.2.5! miod 957:
1.11 markus 958: /* Output any buffered data for stdout. */
959: while (buffer_len(&stdout_buffer) > 0) {
960: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 961: buffer_len(&stdout_buffer));
1.11 markus 962: if (len <= 0) {
963: error("Write failed flushing stdout buffer.");
964: break;
965: }
966: buffer_consume(&stdout_buffer, len);
1.39.2.4 jason 967: stdout_bytes += len;
1.11 markus 968: }
969:
970: /* Output any buffered data for stderr. */
971: while (buffer_len(&stderr_buffer) > 0) {
972: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 973: buffer_len(&stderr_buffer));
1.11 markus 974: if (len <= 0) {
975: error("Write failed flushing stderr buffer.");
976: break;
977: }
978: buffer_consume(&stderr_buffer, len);
1.39.2.4 jason 979: stderr_bytes += len;
1.11 markus 980: }
981:
982: /* Clear and free any buffers. */
983: memset(buf, 0, sizeof(buf));
984: buffer_free(&stdin_buffer);
985: buffer_free(&stdout_buffer);
986: buffer_free(&stderr_buffer);
987:
988: /* Report bytes transferred, and transfer rates. */
989: total_time = get_current_time() - start_time;
990: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
991: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
992: if (total_time > 0)
993: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
994: stdin_bytes / total_time, stdout_bytes / total_time,
995: stderr_bytes / total_time);
996:
997: /* Return the exit status of the program. */
998: debug("Exit status %d", exit_status);
999: return exit_status;
1.15 markus 1000: }
1001:
1002: /*********/
1003:
1.39.2.5! miod 1004: static void
1.36 markus 1005: client_input_stdout_data(int type, int plen, void *ctxt)
1.15 markus 1006: {
1.39.2.1 jason 1007: u_int data_len;
1.15 markus 1008: char *data = packet_get_string(&data_len);
1009: packet_integrity_check(plen, 4 + data_len, type);
1010: buffer_append(&stdout_buffer, data, data_len);
1011: memset(data, 0, data_len);
1012: xfree(data);
1013: }
1.39.2.5! miod 1014: static void
1.36 markus 1015: client_input_stderr_data(int type, int plen, void *ctxt)
1.15 markus 1016: {
1.39.2.1 jason 1017: u_int data_len;
1.15 markus 1018: char *data = packet_get_string(&data_len);
1019: packet_integrity_check(plen, 4 + data_len, type);
1020: buffer_append(&stderr_buffer, data, data_len);
1021: memset(data, 0, data_len);
1022: xfree(data);
1023: }
1.39.2.5! miod 1024: static void
1.36 markus 1025: client_input_exit_status(int type, int plen, void *ctxt)
1.15 markus 1026: {
1027: packet_integrity_check(plen, 4, type);
1028: exit_status = packet_get_int();
1029: /* Acknowledge the exit. */
1030: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1031: packet_send();
1032: /*
1033: * Must wait for packet to be sent since we are
1034: * exiting the loop.
1035: */
1036: packet_write_wait();
1037: /* Flag that we want to exit. */
1038: quit_pending = 1;
1039: }
1040:
1.39.2.5! miod 1041: static Channel *
1.39.2.1 jason 1042: client_request_forwarded_tcpip(const char *request_type, int rchan)
1043: {
1044: Channel* c = NULL;
1045: char *listen_address, *originator_address;
1046: int listen_port, originator_port;
1.39.2.5! miod 1047: int sock;
1.39.2.1 jason 1048:
1049: /* Get rest of the packet */
1050: listen_address = packet_get_string(NULL);
1051: listen_port = packet_get_int();
1052: originator_address = packet_get_string(NULL);
1053: originator_port = packet_get_int();
1054: packet_done();
1055:
1056: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1057: listen_address, listen_port, originator_address, originator_port);
1058:
1.39.2.5! miod 1059: sock = channel_connect_by_listen_address(listen_port);
! 1060: if (sock < 0) {
! 1061: xfree(originator_address);
! 1062: xfree(listen_address);
! 1063: return NULL;
! 1064: }
! 1065: c = channel_new("forwarded-tcpip",
! 1066: SSH_CHANNEL_CONNECTING, sock, sock, -1,
! 1067: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
! 1068: xstrdup(originator_address), 1);
! 1069: if (c == NULL) {
! 1070: error("client_request_forwarded_tcpip: channel_new failed");
! 1071: close(sock);
1.39.2.1 jason 1072: }
1073: xfree(originator_address);
1074: xfree(listen_address);
1075: return c;
1076: }
1077:
1.39.2.5! miod 1078: static Channel*
1.39.2.1 jason 1079: client_request_x11(const char *request_type, int rchan)
1080: {
1081: Channel *c = NULL;
1082: char *originator;
1083: int originator_port;
1.39.2.5! miod 1084: int sock;
1.39.2.1 jason 1085:
1086: if (!options.forward_x11) {
1087: error("Warning: ssh server tried X11 forwarding.");
1088: error("Warning: this is probably a break in attempt by a malicious server.");
1089: return NULL;
1090: }
1091: originator = packet_get_string(NULL);
1092: if (datafellows & SSH_BUG_X11FWD) {
1093: debug2("buggy server: x11 request w/o originator_port");
1094: originator_port = 0;
1095: } else {
1096: originator_port = packet_get_int();
1097: }
1098: packet_done();
1099: /* XXX check permission */
1100: debug("client_request_x11: request from %s %d", originator,
1101: originator_port);
1.39.2.5! miod 1102: xfree(originator);
1.39.2.1 jason 1103: sock = x11_connect_display();
1.39.2.5! miod 1104: if (sock < 0)
! 1105: return NULL;
! 1106: c = channel_new("x11",
! 1107: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
! 1108: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
! 1109: xstrdup("x11"), 1);
! 1110: if (c == NULL) {
! 1111: error("client_request_x11: channel_new failed");
! 1112: close(sock);
1.39.2.1 jason 1113: }
1.39.2.5! miod 1114: c->force_drain = 1;
1.39.2.1 jason 1115: return c;
1116: }
1117:
1.39.2.5! miod 1118: static Channel*
1.39.2.1 jason 1119: client_request_agent(const char *request_type, int rchan)
1120: {
1121: Channel *c = NULL;
1.39.2.5! miod 1122: int sock;
1.39.2.1 jason 1123:
1124: if (!options.forward_agent) {
1125: error("Warning: ssh server tried agent forwarding.");
1126: error("Warning: this is probably a break in attempt by a malicious server.");
1127: return NULL;
1128: }
1129: sock = ssh_get_authentication_socket();
1.39.2.5! miod 1130: if (sock < 0)
! 1131: return NULL;
! 1132: c = channel_new("authentication agent connection",
! 1133: SSH_CHANNEL_OPEN, sock, sock, -1,
! 1134: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
! 1135: xstrdup("authentication agent connection"), 1);
! 1136: if (c == NULL) {
! 1137: error("client_request_agent: channel_new failed");
! 1138: close(sock);
1.39.2.1 jason 1139: }
1.39.2.5! miod 1140: c->force_drain = 1;
1.39.2.1 jason 1141: return c;
1142: }
1143:
1.22 markus 1144: /* XXXX move to generic input handler */
1.39.2.5! miod 1145: static void
1.36 markus 1146: client_input_channel_open(int type, int plen, void *ctxt)
1.22 markus 1147: {
1148: Channel *c = NULL;
1149: char *ctype;
1.39.2.1 jason 1150: u_int len;
1.22 markus 1151: int rchan;
1152: int rmaxpack;
1153: int rwindow;
1154:
1155: ctype = packet_get_string(&len);
1156: rchan = packet_get_int();
1157: rwindow = packet_get_int();
1158: rmaxpack = packet_get_int();
1159:
1.24 markus 1160: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1161: ctype, rchan, rwindow, rmaxpack);
1162:
1.39.2.1 jason 1163: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1164: c = client_request_forwarded_tcpip(ctype, rchan);
1165: } else if (strcmp(ctype, "x11") == 0) {
1166: c = client_request_x11(ctype, rchan);
1167: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1168: c = client_request_agent(ctype, rchan);
1.22 markus 1169: }
1170: /* XXX duplicate : */
1171: if (c != NULL) {
1172: debug("confirm %s", ctype);
1173: c->remote_id = rchan;
1174: c->remote_window = rwindow;
1175: c->remote_maxpacket = rmaxpack;
1.39.2.5! miod 1176: if (c->type != SSH_CHANNEL_CONNECTING) {
! 1177: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
! 1178: packet_put_int(c->remote_id);
! 1179: packet_put_int(c->self);
! 1180: packet_put_int(c->local_window);
! 1181: packet_put_int(c->local_maxpacket);
! 1182: packet_send();
! 1183: }
1.22 markus 1184: } else {
1185: debug("failure %s", ctype);
1186: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1187: packet_put_int(rchan);
1188: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.39.2.5! miod 1189: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
! 1190: packet_put_cstring("open failed");
! 1191: packet_put_cstring("");
! 1192: }
1.22 markus 1193: packet_send();
1194: }
1195: xfree(ctype);
1196: }
1.39.2.5! miod 1197: static void
1.39.2.1 jason 1198: client_input_channel_req(int type, int plen, void *ctxt)
1199: {
1200: Channel *c = NULL;
1201: int id, reply, success = 0;
1202: char *rtype;
1203:
1204: id = packet_get_int();
1205: rtype = packet_get_string(NULL);
1206: reply = packet_get_char();
1207:
1208: debug("client_input_channel_req: channel %d rtype %s reply %d",
1209: id, rtype, reply);
1210:
1211: if (session_ident == -1) {
1212: error("client_input_channel_req: no channel %d", session_ident);
1213: } else if (id != session_ident) {
1214: error("client_input_channel_req: channel %d: wrong channel: %d",
1215: session_ident, id);
1216: }
1217: c = channel_lookup(id);
1218: if (c == NULL) {
1219: error("client_input_channel_req: channel %d: unknown channel", id);
1220: } else if (strcmp(rtype, "exit-status") == 0) {
1221: success = 1;
1222: exit_status = packet_get_int();
1223: packet_done();
1224: }
1225: if (reply) {
1226: packet_start(success ?
1227: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1228: packet_put_int(c->remote_id);
1229: packet_send();
1230: }
1231: xfree(rtype);
1232: }
1.22 markus 1233:
1.39.2.5! miod 1234: static void
1.39.2.1 jason 1235: client_init_dispatch_20(void)
1.16 markus 1236: {
1237: dispatch_init(&dispatch_protocol_error);
1238: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1239: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1240: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1241: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1242: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1243: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1244: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.39.2.1 jason 1245: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1246: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.39.2.4 jason 1247:
1248: /* rekeying */
1249: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.16 markus 1250: }
1.39.2.5! miod 1251: static void
1.39.2.1 jason 1252: client_init_dispatch_13(void)
1.15 markus 1253: {
1254: dispatch_init(NULL);
1255: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1256: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1257: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1258: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1259: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1260: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1261: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1262: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1263: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1264:
1265: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1266: &auth_input_open_request : &deny_input_open);
1267: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1268: &x11_input_open : &deny_input_open);
1.15 markus 1269: }
1.39.2.5! miod 1270: static void
1.39.2.1 jason 1271: client_init_dispatch_15(void)
1.15 markus 1272: {
1273: client_init_dispatch_13();
1274: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1275: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1276: }
1.39.2.5! miod 1277: static void
1.39.2.1 jason 1278: client_init_dispatch(void)
1.15 markus 1279: {
1.16 markus 1280: if (compat20)
1281: client_init_dispatch_20();
1282: else if (compat13)
1.15 markus 1283: client_init_dispatch_13();
1284: else
1285: client_init_dispatch_15();
1.1 deraadt 1286: }