Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.85
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.
1.78 markus 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"
1.85 ! markus 62: RCSID("$OpenBSD: clientloop.c,v 1.84 2001/10/11 15:24:00 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"
1.74 markus 71: #include "channels.h"
1.15 markus 72: #include "dispatch.h"
1.30 markus 73: #include "buffer.h"
74: #include "bufaux.h"
1.40 markus 75: #include "key.h"
1.54 markus 76: #include "kex.h"
1.45 markus 77: #include "log.h"
78: #include "readconf.h"
79: #include "clientloop.h"
1.40 markus 80: #include "authfd.h"
1.45 markus 81: #include "atomicio.h"
1.62 stevesk 82: #include "sshtty.h"
1.63 markus 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;
1.75 markus 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. */
1.42 markus 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). */
1.56 markus 124: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 125: static int session_closed = 0; /* In SSH2: login session closed. */
1.1 deraadt 126:
1.77 itojun 127: static void client_init_dispatch(void);
1.16 markus 128: int session_ident = -1;
129:
1.54 markus 130: /*XXX*/
131: extern Kex *xxx_kex;
132:
1.1 deraadt 133: /* Restores stdin to blocking mode. */
134:
1.77 itojun 135: static void
1.49 itojun 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:
1.77 itojun 147: static void
1.49 itojun 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:
1.77 itojun 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:
1.77 itojun 172: static void
1.11 markus 173: signal_handler(int sig)
1.1 deraadt 174: {
1.75 markus 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:
1.77 itojun 184: static double
1.49 itojun 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:
1.77 itojun 198: static void
1.49 itojun 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: */
1.42 markus 235: if ((u_char) buf[0] == escape_char)
1.11 markus 236: escape_pending = 1;
1.52 markus 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:
1.77 itojun 250: static void
1.49 itojun 251: client_make_packets_from_stdin_data(void)
1.1 deraadt 252: {
1.42 markus 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);
1.52 markus 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:
1.77 itojun 282: static void
1.49 itojun 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:
1.77 itojun 319: static void
1.46 markus 320: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.81 markus 321: int *maxfdp, int *nallocp, int rekeying)
1.11 markus 322: {
1.46 markus 323: /* Add any selections by the channel mechanism. */
1.81 markus 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())
1.46 markus 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())
1.46 markus 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)
1.46 markus 341: FD_SET(fileno(stdout), *writesetp);
1.17 markus 342: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 343: FD_SET(fileno(stderr), *writesetp);
1.16 markus 344: } else {
1.71 markus 345: /* channel_prepare_select could have closed the last channel */
1.84 markus 346: if (session_closed && !channel_still_open() &&
347: !packet_have_data_to_write()) {
348: /* clear mask since we did not call select() */
349: memset(*readsetp, 0, *maxfdp);
350: memset(*writesetp, 0, *maxfdp);
351: return;
1.71 markus 352: } else {
353: FD_SET(connection_in, *readsetp);
354: }
1.16 markus 355: }
1.11 markus 356:
357: /* Select server connection if have data to write to the server. */
358: if (packet_have_data_to_write())
1.46 markus 359: FD_SET(connection_out, *writesetp);
1.11 markus 360:
1.13 markus 361: /*
362: * Wait for something to happen. This will suspend the process until
363: * some selected descriptor can be read, written, or has some other
364: * event pending. Note: if you want to implement SSH_MSG_IGNORE
365: * messages to fool traffic analysis, this might be the place to do
366: * it: just have a random timeout for the select, and send a random
367: * SSH_MSG_IGNORE packet when the timeout expires.
368: */
1.11 markus 369:
1.46 markus 370: if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
1.11 markus 371: char buf[100];
1.51 markus 372:
373: /*
374: * We have to clear the select masks, because we return.
375: * We have to return, because the mainloop checks for the flags
376: * set by the signal handlers.
377: */
378: memset(*readsetp, 0, *maxfdp);
379: memset(*writesetp, 0, *maxfdp);
1.50 deraadt 380:
1.11 markus 381: if (errno == EINTR)
382: return;
383: /* Note: we might still have data in the buffers. */
384: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
385: buffer_append(&stderr_buffer, buf, strlen(buf));
386: quit_pending = 1;
387: }
388: }
389:
1.77 itojun 390: static void
1.31 markus 391: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 392: {
1.11 markus 393: struct winsize oldws, newws;
394:
395: /* Flush stdout and stderr buffers. */
1.31 markus 396: if (buffer_len(bout) > 0)
397: atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
398: if (buffer_len(berr) > 0)
399: atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 400:
401: leave_raw_mode();
402:
1.13 markus 403: /*
404: * Free (and clear) the buffer to reduce the amount of data that gets
405: * written to swap.
406: */
1.31 markus 407: buffer_free(bin);
408: buffer_free(bout);
409: buffer_free(berr);
1.11 markus 410:
411: /* Save old window size. */
412: ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
413:
414: /* Send the suspend signal to the program itself. */
415: kill(getpid(), SIGTSTP);
416:
417: /* Check if the window size has changed. */
418: if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
419: (oldws.ws_row != newws.ws_row ||
420: oldws.ws_col != newws.ws_col ||
421: oldws.ws_xpixel != newws.ws_xpixel ||
422: oldws.ws_ypixel != newws.ws_ypixel))
423: received_window_change_signal = 1;
424:
425: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 426: buffer_init(bin);
427: buffer_init(bout);
428: buffer_init(berr);
1.11 markus 429:
430: enter_raw_mode();
431: }
432:
1.77 itojun 433: static void
1.17 markus 434: client_process_net_input(fd_set * readset)
1.11 markus 435: {
1.17 markus 436: int len;
437: char buf[8192];
1.11 markus 438:
1.13 markus 439: /*
440: * Read input from the server, and add any such data to the buffer of
441: * the packet subsystem.
442: */
1.11 markus 443: if (FD_ISSET(connection_in, readset)) {
444: /* Read as much as possible. */
445: len = read(connection_in, buf, sizeof(buf));
446: if (len == 0) {
447: /* Received EOF. The remote host has closed the connection. */
448: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
449: host);
1.1 deraadt 450: buffer_append(&stderr_buffer, buf, strlen(buf));
451: quit_pending = 1;
452: return;
1.11 markus 453: }
1.13 markus 454: /*
455: * There is a kernel bug on Solaris that causes select to
456: * sometimes wake up even though there is no data available.
457: */
1.53 millert 458: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 459: len = 0;
460:
461: if (len < 0) {
462: /* An error has encountered. Perhaps there is a network problem. */
463: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
464: host, strerror(errno));
465: buffer_append(&stderr_buffer, buf, strlen(buf));
466: quit_pending = 1;
467: return;
468: }
469: packet_process_incoming(buf, len);
470: }
1.17 markus 471: }
1.16 markus 472:
1.31 markus 473: /* process the characters one by one */
1.77 itojun 474: static int
1.31 markus 475: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
476: {
1.32 markus 477: char string[1024];
1.31 markus 478: pid_t pid;
479: int bytes = 0;
1.42 markus 480: u_int i;
481: u_char ch;
1.31 markus 482: char *s;
483:
484: for (i = 0; i < len; i++) {
485: /* Get one character at a time. */
486: ch = buf[i];
487:
488: if (escape_pending) {
489: /* We have previously seen an escape character. */
490: /* Clear the flag now. */
491: escape_pending = 0;
492:
493: /* Process the escaped character. */
494: switch (ch) {
495: case '.':
496: /* Terminate the connection. */
1.32 markus 497: snprintf(string, sizeof string, "%c.\r\n", escape_char);
498: buffer_append(berr, string, strlen(string));
1.31 markus 499:
500: quit_pending = 1;
501: return -1;
502:
503: case 'Z' - 64:
504: /* Suspend the program. */
505: /* Print a message to that effect to the user. */
1.32 markus 506: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
507: buffer_append(berr, string, strlen(string));
1.31 markus 508:
509: /* Restore terminal modes and suspend. */
510: client_suspend_self(bin, bout, berr);
511:
512: /* We have been continued. */
513: continue;
514:
1.54 markus 515: case 'R':
1.59 markus 516: if (compat20) {
517: if (datafellows & SSH_BUG_NOREKEY)
518: log("Server does not support re-keying");
519: else
520: need_rekeying = 1;
521: }
1.54 markus 522: continue;
523:
1.31 markus 524: case '&':
525: /* XXX does not work yet with proto 2 */
526: if (compat20)
527: continue;
528: /*
529: * Detach the program (continue to serve connections,
530: * but put in background and no more new connections).
531: */
532: if (!stdin_eof) {
533: /*
534: * Sending SSH_CMSG_EOF alone does not always appear
535: * to be enough. So we try to send an EOF character
536: * first.
537: */
538: packet_start(SSH_CMSG_STDIN_DATA);
539: packet_put_string("\004", 1);
540: packet_send();
541: /* Close stdin. */
542: stdin_eof = 1;
543: if (buffer_len(bin) == 0) {
544: packet_start(SSH_CMSG_EOF);
545: packet_send();
546: }
547: }
548: /* Restore tty modes. */
549: leave_raw_mode();
550:
551: /* Stop listening for new connections. */
1.76 markus 552: channel_close_all(); /* proto1 only XXXX */
1.31 markus 553:
554: printf("%c& [backgrounded]\n", escape_char);
555:
556: /* Fork into background. */
557: pid = fork();
558: if (pid < 0) {
559: error("fork: %.100s", strerror(errno));
560: continue;
561: }
562: if (pid != 0) { /* This is the parent. */
563: /* The parent just exits. */
564: exit(0);
565: }
566: /* The child continues serving connections. */
567: continue; /*XXX ? */
568:
569: case '?':
1.32 markus 570: snprintf(string, sizeof string,
1.31 markus 571: "%c?\r\n\
572: Supported escape sequences:\r\n\
573: ~. - terminate connection\r\n\
1.72 stevesk 574: ~R - Request rekey (SSH protocol 2 only)\r\n\
1.31 markus 575: ~^Z - suspend ssh\r\n\
576: ~# - list forwarded connections\r\n\
577: ~& - background ssh (when waiting for connections to terminate)\r\n\
578: ~? - this message\r\n\
579: ~~ - send the escape character by typing it twice\r\n\
580: (Note that escapes are only recognized immediately after newline.)\r\n",
581: escape_char);
1.32 markus 582: buffer_append(berr, string, strlen(string));
1.31 markus 583: continue;
584:
585: case '#':
1.32 markus 586: snprintf(string, sizeof string, "%c#\r\n", escape_char);
587: buffer_append(berr, string, strlen(string));
1.31 markus 588: s = channel_open_message();
589: buffer_append(berr, s, strlen(s));
590: xfree(s);
591: continue;
592:
593: default:
594: if (ch != escape_char) {
595: buffer_put_char(bin, escape_char);
596: bytes++;
597: }
598: /* Escaped characters fall through here */
599: break;
600: }
601: } else {
602: /*
603: * The previous character was not an escape char. Check if this
604: * is an escape.
605: */
606: if (last_was_cr && ch == escape_char) {
607: /* It is. Set the flag and continue to next character. */
608: escape_pending = 1;
609: continue;
610: }
611: }
612:
613: /*
614: * Normal character. Record whether it was a newline,
615: * and append it to the buffer.
616: */
617: last_was_cr = (ch == '\r' || ch == '\n');
618: buffer_put_char(bin, ch);
619: bytes++;
620: }
621: return bytes;
622: }
623:
1.77 itojun 624: static void
1.17 markus 625: client_process_input(fd_set * readset)
626: {
1.21 deraadt 627: int len;
1.31 markus 628: char buf[8192];
1.16 markus 629:
1.11 markus 630: /* Read input from stdin. */
631: if (FD_ISSET(fileno(stdin), readset)) {
632: /* Read as much as possible. */
633: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 634: if (len < 0 && (errno == EAGAIN || errno == EINTR))
635: return; /* we'll try again later */
1.11 markus 636: if (len <= 0) {
1.13 markus 637: /*
638: * Received EOF or error. They are treated
639: * similarly, except that an error message is printed
640: * if it was an error condition.
641: */
1.11 markus 642: if (len < 0) {
643: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
644: buffer_append(&stderr_buffer, buf, strlen(buf));
645: }
646: /* Mark that we have seen EOF. */
647: stdin_eof = 1;
1.13 markus 648: /*
649: * Send an EOF message to the server unless there is
650: * data in the buffer. If there is data in the
651: * buffer, no message will be sent now. Code
652: * elsewhere will send the EOF when the buffer
653: * becomes empty if stdin_eof is set.
654: */
1.11 markus 655: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 656: packet_start(SSH_CMSG_EOF);
657: packet_send();
1.11 markus 658: }
1.72 stevesk 659: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 660: /*
661: * Normal successful read, and no escape character.
662: * Just append the data to buffer.
663: */
1.11 markus 664: buffer_append(&stdin_buffer, buf, len);
665: } else {
1.13 markus 666: /*
667: * Normal, successful read. But we have an escape character
668: * and have to process the characters one by one.
669: */
1.52 markus 670: if (process_escapes(&stdin_buffer, &stdout_buffer,
671: &stderr_buffer, buf, len) == -1)
1.31 markus 672: return;
1.11 markus 673: }
674: }
675: }
676:
1.77 itojun 677: static void
1.11 markus 678: client_process_output(fd_set * writeset)
679: {
680: int len;
681: char buf[100];
1.1 deraadt 682:
1.11 markus 683: /* Write buffered output to stdout. */
684: if (FD_ISSET(fileno(stdout), writeset)) {
685: /* Write as much data as possible. */
686: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 687: buffer_len(&stdout_buffer));
1.11 markus 688: if (len <= 0) {
1.64 markus 689: if (errno == EINTR || errno == EAGAIN)
1.11 markus 690: len = 0;
691: else {
1.13 markus 692: /*
693: * An error or EOF was encountered. Put an
694: * error message to stderr buffer.
695: */
1.11 markus 696: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
697: buffer_append(&stderr_buffer, buf, strlen(buf));
698: quit_pending = 1;
699: return;
700: }
701: }
702: /* Consume printed data from the buffer. */
703: buffer_consume(&stdout_buffer, len);
1.57 markus 704: stdout_bytes += len;
1.11 markus 705: }
706: /* Write buffered output to stderr. */
707: if (FD_ISSET(fileno(stderr), writeset)) {
708: /* Write as much data as possible. */
709: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 710: buffer_len(&stderr_buffer));
1.11 markus 711: if (len <= 0) {
1.64 markus 712: if (errno == EINTR || errno == EAGAIN)
1.11 markus 713: len = 0;
714: else {
1.13 markus 715: /* EOF or error, but can't even print error message. */
1.11 markus 716: quit_pending = 1;
717: return;
718: }
719: }
720: /* Consume printed characters from the buffer. */
721: buffer_consume(&stderr_buffer, len);
1.57 markus 722: stderr_bytes += len;
1.11 markus 723: }
1.1 deraadt 724: }
725:
1.13 markus 726: /*
1.15 markus 727: * Get packets from the connection input buffer, and process them as long as
728: * there are packets available.
729: *
730: * Any unknown packets received during the actual
731: * session cause the session to terminate. This is
732: * intended to make debugging easier since no
733: * confirmations are sent. Any compatible protocol
734: * extensions must be negotiated during the
735: * preparatory phase.
736: */
737:
1.77 itojun 738: static void
1.49 itojun 739: client_process_buffered_input_packets(void)
1.15 markus 740: {
1.54 markus 741: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 742: }
743:
1.31 markus 744: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 745:
1.77 itojun 746: static int
1.31 markus 747: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 748: {
1.31 markus 749: /* XXX we assume c->extended is writeable */
750: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 751: }
752:
1.77 itojun 753: static void
1.60 markus 754: client_channel_closed(int id, void *arg)
755: {
756: if (id != session_ident)
757: error("client_channel_closed: id %d != session_ident %d",
758: id, session_ident);
1.83 markus 759: channel_cancel_cleanup(id);
1.60 markus 760: session_closed = 1;
1.62 stevesk 761: if (in_raw_mode())
1.61 markus 762: leave_raw_mode();
1.60 markus 763: }
764:
1.15 markus 765: /*
1.13 markus 766: * Implements the interactive session with the server. This is called after
767: * the user has been authenticated, and a command has been started on the
1.72 stevesk 768: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
769: * used as an escape character for terminating or suspending the session.
1.13 markus 770: */
1.1 deraadt 771:
1.20 markus 772: int
1.30 markus 773: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 774: {
1.46 markus 775: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 776: double start_time, total_time;
1.81 markus 777: int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0;
1.11 markus 778: char buf[100];
779:
780: debug("Entering interactive session.");
781:
782: start_time = get_current_time();
783:
784: /* Initialize variables. */
785: escape_pending = 0;
786: last_was_cr = 1;
787: exit_status = -1;
788: stdin_eof = 0;
789: buffer_high = 64 * 1024;
790: connection_in = packet_get_connection_in();
791: connection_out = packet_get_connection_out();
1.46 markus 792: max_fd = MAX(connection_in, connection_out);
793:
794: if (!compat20) {
1.63 markus 795: /* enable nonblocking unless tty */
796: if (!isatty(fileno(stdin)))
797: set_nonblock(fileno(stdin));
798: if (!isatty(fileno(stdout)))
799: set_nonblock(fileno(stdout));
800: if (!isatty(fileno(stderr)))
801: set_nonblock(fileno(stderr));
1.46 markus 802: max_fd = MAX(max_fd, fileno(stdin));
803: max_fd = MAX(max_fd, fileno(stdout));
804: max_fd = MAX(max_fd, fileno(stderr));
805: }
1.11 markus 806: stdin_bytes = 0;
807: stdout_bytes = 0;
808: stderr_bytes = 0;
809: quit_pending = 0;
810: escape_char = escape_char_arg;
811:
812: /* Initialize buffers. */
813: buffer_init(&stdin_buffer);
814: buffer_init(&stdout_buffer);
815: buffer_init(&stderr_buffer);
816:
1.15 markus 817: client_init_dispatch();
818:
1.11 markus 819: /* Set signal handlers to restore non-blocking mode. */
820: signal(SIGINT, signal_handler);
821: signal(SIGQUIT, signal_handler);
822: signal(SIGTERM, signal_handler);
823: if (have_pty)
824: signal(SIGWINCH, window_change_handler);
825:
826: if (have_pty)
827: enter_raw_mode();
828:
1.48 markus 829: if (compat20) {
830: session_ident = ssh2_chan_id;
1.72 stevesk 831: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 832: channel_register_filter(session_ident,
833: simple_escape_filter);
1.60 markus 834: if (session_ident != -1)
835: channel_register_cleanup(session_ident,
836: client_channel_closed);
1.48 markus 837: } else {
838: /* Check if we should immediately send eof on stdin. */
1.16 markus 839: client_check_initial_eof_on_stdin();
1.48 markus 840: }
1.30 markus 841:
1.11 markus 842: /* Main loop of the client for the interactive session mode. */
843: while (!quit_pending) {
844:
1.13 markus 845: /* Process buffered packets sent by the server. */
1.11 markus 846: client_process_buffered_input_packets();
847:
1.60 markus 848: if (compat20 && session_closed && !channel_still_open())
849: break;
850:
1.56 markus 851: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 852:
1.56 markus 853: if (rekeying) {
854: debug("rekeying in progress");
855: } else {
856: /*
857: * Make packets of buffered stdin data, and buffer
858: * them for sending to the server.
859: */
860: if (!compat20)
861: client_make_packets_from_stdin_data();
1.11 markus 862:
1.56 markus 863: /*
864: * Make packets from buffered channel data, and
865: * enqueue them for sending to the server.
866: */
867: if (packet_not_very_much_data_to_write())
868: channel_output_poll();
1.11 markus 869:
1.56 markus 870: /*
871: * Check if the window size has changed, and buffer a
872: * message about it to the server if so.
873: */
874: client_check_window_change();
1.11 markus 875:
1.56 markus 876: if (quit_pending)
877: break;
878: }
1.13 markus 879: /*
880: * Wait until we have something to do (something becomes
881: * available on one of the descriptors).
882: */
1.81 markus 883: max_fd2 = max_fd;
1.56 markus 884: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 885: &max_fd2, &nalloc, rekeying);
1.11 markus 886:
887: if (quit_pending)
888: break;
889:
1.56 markus 890: /* Do channel operations unless rekeying in progress. */
891: if (!rekeying) {
892: channel_after_select(readset, writeset);
893:
894: if (need_rekeying) {
895: debug("user requests rekeying");
896: xxx_kex->done = 0;
897: kex_send_kexinit(xxx_kex);
898: need_rekeying = 0;
899: }
900: }
1.11 markus 901:
1.17 markus 902: /* Buffer input from the connection. */
1.46 markus 903: client_process_net_input(readset);
1.17 markus 904:
905: if (quit_pending)
906: break;
1.11 markus 907:
1.17 markus 908: if (!compat20) {
909: /* Buffer data from stdin */
1.46 markus 910: client_process_input(readset);
1.17 markus 911: /*
912: * Process output to stdout and stderr. Output to
913: * the connection is processed elsewhere (above).
914: */
1.46 markus 915: client_process_output(writeset);
1.17 markus 916: }
1.11 markus 917:
1.13 markus 918: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 919: if (FD_ISSET(connection_out, writeset))
1.11 markus 920: packet_write_poll();
921: }
1.46 markus 922: if (readset)
923: xfree(readset);
924: if (writeset)
925: xfree(writeset);
1.11 markus 926:
927: /* Terminate the session. */
928:
929: /* Stop watching for window change. */
930: if (have_pty)
931: signal(SIGWINCH, SIG_DFL);
932:
1.76 markus 933: channel_free_all();
1.11 markus 934:
1.75 markus 935: if (have_pty)
936: leave_raw_mode();
937:
938: /* restore blocking io */
939: if (!isatty(fileno(stdin)))
940: unset_nonblock(fileno(stdin));
941: if (!isatty(fileno(stdout)))
942: unset_nonblock(fileno(stdout));
943: if (!isatty(fileno(stderr)))
944: unset_nonblock(fileno(stderr));
945:
946: if (received_signal) {
947: if (in_non_blocking_mode) /* XXX */
948: leave_non_blocking();
949: fatal("Killed by signal %d.", received_signal);
950: }
951:
1.13 markus 952: /*
953: * In interactive mode (with pseudo tty) display a message indicating
954: * that the connection has been closed.
955: */
1.11 markus 956: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
957: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
958: buffer_append(&stderr_buffer, buf, strlen(buf));
959: }
1.70 markus 960:
1.11 markus 961: /* Output any buffered data for stdout. */
1.70 markus 962: while (buffer_len(&stdout_buffer) > 0) {
963: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 964: buffer_len(&stdout_buffer));
1.70 markus 965: if (len <= 0) {
1.11 markus 966: error("Write failed flushing stdout buffer.");
1.70 markus 967: break;
968: }
1.11 markus 969: buffer_consume(&stdout_buffer, len);
1.57 markus 970: stdout_bytes += len;
1.11 markus 971: }
972:
973: /* Output any buffered data for stderr. */
1.70 markus 974: while (buffer_len(&stderr_buffer) > 0) {
975: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 976: buffer_len(&stderr_buffer));
1.70 markus 977: if (len <= 0) {
1.11 markus 978: error("Write failed flushing stderr buffer.");
1.70 markus 979: break;
980: }
1.11 markus 981: buffer_consume(&stderr_buffer, len);
1.57 markus 982: stderr_bytes += len;
1.11 markus 983: }
984:
985: /* Clear and free any buffers. */
986: memset(buf, 0, sizeof(buf));
987: buffer_free(&stdin_buffer);
988: buffer_free(&stdout_buffer);
989: buffer_free(&stderr_buffer);
990:
991: /* Report bytes transferred, and transfer rates. */
992: total_time = get_current_time() - start_time;
993: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
994: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
995: if (total_time > 0)
996: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
997: stdin_bytes / total_time, stdout_bytes / total_time,
998: stderr_bytes / total_time);
999:
1000: /* Return the exit status of the program. */
1001: debug("Exit status %d", exit_status);
1002: return exit_status;
1.15 markus 1003: }
1004:
1005: /*********/
1006:
1.77 itojun 1007: static void
1.36 markus 1008: client_input_stdout_data(int type, int plen, void *ctxt)
1.15 markus 1009: {
1.42 markus 1010: u_int data_len;
1.15 markus 1011: char *data = packet_get_string(&data_len);
1012: packet_integrity_check(plen, 4 + data_len, type);
1013: buffer_append(&stdout_buffer, data, data_len);
1014: memset(data, 0, data_len);
1015: xfree(data);
1016: }
1.77 itojun 1017: static void
1.36 markus 1018: client_input_stderr_data(int type, int plen, void *ctxt)
1.15 markus 1019: {
1.42 markus 1020: u_int data_len;
1.15 markus 1021: char *data = packet_get_string(&data_len);
1022: packet_integrity_check(plen, 4 + data_len, type);
1023: buffer_append(&stderr_buffer, data, data_len);
1024: memset(data, 0, data_len);
1025: xfree(data);
1026: }
1.77 itojun 1027: static void
1.36 markus 1028: client_input_exit_status(int type, int plen, void *ctxt)
1.15 markus 1029: {
1030: packet_integrity_check(plen, 4, type);
1031: exit_status = packet_get_int();
1032: /* Acknowledge the exit. */
1033: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1034: packet_send();
1035: /*
1036: * Must wait for packet to be sent since we are
1037: * exiting the loop.
1038: */
1039: packet_write_wait();
1040: /* Flag that we want to exit. */
1041: quit_pending = 1;
1042: }
1043:
1.77 itojun 1044: static Channel *
1.40 markus 1045: client_request_forwarded_tcpip(const char *request_type, int rchan)
1046: {
1047: Channel* c = NULL;
1048: char *listen_address, *originator_address;
1049: int listen_port, originator_port;
1.67 markus 1050: int sock;
1.40 markus 1051:
1052: /* Get rest of the packet */
1053: listen_address = packet_get_string(NULL);
1054: listen_port = packet_get_int();
1055: originator_address = packet_get_string(NULL);
1056: originator_port = packet_get_int();
1057: packet_done();
1058:
1059: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1060: listen_address, listen_port, originator_address, originator_port);
1061:
1.80 stevesk 1062: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1063: if (sock < 0) {
1064: xfree(originator_address);
1065: xfree(listen_address);
1066: return NULL;
1067: }
1068: c = channel_new("forwarded-tcpip",
1069: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1070: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1071: xstrdup(originator_address), 1);
1072: if (c == NULL) {
1073: error("client_request_forwarded_tcpip: channel_new failed");
1074: close(sock);
1.40 markus 1075: }
1076: xfree(originator_address);
1077: xfree(listen_address);
1078: return c;
1079: }
1080:
1.77 itojun 1081: static Channel*
1.40 markus 1082: client_request_x11(const char *request_type, int rchan)
1083: {
1084: Channel *c = NULL;
1085: char *originator;
1086: int originator_port;
1.67 markus 1087: int sock;
1.40 markus 1088:
1089: if (!options.forward_x11) {
1090: error("Warning: ssh server tried X11 forwarding.");
1091: error("Warning: this is probably a break in attempt by a malicious server.");
1092: return NULL;
1093: }
1094: originator = packet_get_string(NULL);
1095: if (datafellows & SSH_BUG_X11FWD) {
1096: debug2("buggy server: x11 request w/o originator_port");
1097: originator_port = 0;
1098: } else {
1099: originator_port = packet_get_int();
1100: }
1101: packet_done();
1102: /* XXX check permission */
1.47 markus 1103: debug("client_request_x11: request from %s %d", originator,
1104: originator_port);
1.67 markus 1105: xfree(originator);
1.40 markus 1106: sock = x11_connect_display();
1.67 markus 1107: if (sock < 0)
1108: return NULL;
1109: c = channel_new("x11",
1110: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1111: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
1112: xstrdup("x11"), 1);
1113: if (c == NULL) {
1114: error("client_request_x11: channel_new failed");
1115: close(sock);
1.40 markus 1116: }
1.82 markus 1117: c->force_drain = 1;
1.40 markus 1118: return c;
1119: }
1120:
1.77 itojun 1121: static Channel*
1.40 markus 1122: client_request_agent(const char *request_type, int rchan)
1123: {
1124: Channel *c = NULL;
1.67 markus 1125: int sock;
1.40 markus 1126:
1127: if (!options.forward_agent) {
1128: error("Warning: ssh server tried agent forwarding.");
1129: error("Warning: this is probably a break in attempt by a malicious server.");
1130: return NULL;
1131: }
1132: sock = ssh_get_authentication_socket();
1.67 markus 1133: if (sock < 0)
1134: return NULL;
1135: c = channel_new("authentication agent connection",
1136: SSH_CHANNEL_OPEN, sock, sock, -1,
1137: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1138: xstrdup("authentication agent connection"), 1);
1139: if (c == NULL) {
1140: error("client_request_agent: channel_new failed");
1141: close(sock);
1.40 markus 1142: }
1.82 markus 1143: c->force_drain = 1;
1.40 markus 1144: return c;
1145: }
1146:
1.22 markus 1147: /* XXXX move to generic input handler */
1.77 itojun 1148: static void
1.36 markus 1149: client_input_channel_open(int type, int plen, void *ctxt)
1.22 markus 1150: {
1151: Channel *c = NULL;
1152: char *ctype;
1.42 markus 1153: u_int len;
1.22 markus 1154: int rchan;
1155: int rmaxpack;
1156: int rwindow;
1157:
1158: ctype = packet_get_string(&len);
1159: rchan = packet_get_int();
1160: rwindow = packet_get_int();
1161: rmaxpack = packet_get_int();
1162:
1.24 markus 1163: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1164: ctype, rchan, rwindow, rmaxpack);
1165:
1.40 markus 1166: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1167: c = client_request_forwarded_tcpip(ctype, rchan);
1168: } else if (strcmp(ctype, "x11") == 0) {
1169: c = client_request_x11(ctype, rchan);
1170: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1171: c = client_request_agent(ctype, rchan);
1.22 markus 1172: }
1173: /* XXX duplicate : */
1174: if (c != NULL) {
1175: debug("confirm %s", ctype);
1176: c->remote_id = rchan;
1177: c->remote_window = rwindow;
1178: c->remote_maxpacket = rmaxpack;
1.69 markus 1179: if (c->type != SSH_CHANNEL_CONNECTING) {
1180: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1181: packet_put_int(c->remote_id);
1182: packet_put_int(c->self);
1183: packet_put_int(c->local_window);
1184: packet_put_int(c->local_maxpacket);
1185: packet_send();
1186: }
1.22 markus 1187: } else {
1188: debug("failure %s", ctype);
1189: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1190: packet_put_int(rchan);
1191: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1192: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1193: packet_put_cstring("open failed");
1.66 markus 1194: packet_put_cstring("");
1195: }
1.22 markus 1196: packet_send();
1197: }
1198: xfree(ctype);
1199: }
1.77 itojun 1200: static void
1.48 markus 1201: client_input_channel_req(int type, int plen, void *ctxt)
1202: {
1203: Channel *c = NULL;
1204: int id, reply, success = 0;
1205: char *rtype;
1206:
1207: id = packet_get_int();
1208: rtype = packet_get_string(NULL);
1209: reply = packet_get_char();
1210:
1211: debug("client_input_channel_req: channel %d rtype %s reply %d",
1212: id, rtype, reply);
1213:
1214: if (session_ident == -1) {
1215: error("client_input_channel_req: no channel %d", session_ident);
1216: } else if (id != session_ident) {
1217: error("client_input_channel_req: channel %d: wrong channel: %d",
1218: session_ident, id);
1219: }
1220: c = channel_lookup(id);
1221: if (c == NULL) {
1222: error("client_input_channel_req: channel %d: unknown channel", id);
1223: } else if (strcmp(rtype, "exit-status") == 0) {
1224: success = 1;
1225: exit_status = packet_get_int();
1226: packet_done();
1227: }
1228: if (reply) {
1229: packet_start(success ?
1230: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1231: packet_put_int(c->remote_id);
1232: packet_send();
1233: }
1234: xfree(rtype);
1235: }
1.22 markus 1236:
1.77 itojun 1237: static void
1.49 itojun 1238: client_init_dispatch_20(void)
1.16 markus 1239: {
1.55 markus 1240: dispatch_init(&dispatch_protocol_error);
1.16 markus 1241: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1242: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1243: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1244: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1245: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1246: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1247: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1248: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1249: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.55 markus 1250:
1251: /* rekeying */
1252: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.16 markus 1253: }
1.77 itojun 1254: static void
1.49 itojun 1255: client_init_dispatch_13(void)
1.15 markus 1256: {
1257: dispatch_init(NULL);
1258: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1259: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1260: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1261: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1262: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1263: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1264: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1265: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1266: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1267:
1268: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1269: &auth_input_open_request : &deny_input_open);
1270: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1271: &x11_input_open : &deny_input_open);
1.15 markus 1272: }
1.77 itojun 1273: static void
1.49 itojun 1274: client_init_dispatch_15(void)
1.15 markus 1275: {
1276: client_init_dispatch_13();
1277: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1278: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1279: }
1.79 stevesk 1280: static void
1.49 itojun 1281: client_init_dispatch(void)
1.15 markus 1282: {
1.16 markus 1283: if (compat20)
1284: client_init_dispatch_20();
1285: else if (compat13)
1.15 markus 1286: client_init_dispatch_13();
1287: else
1288: client_init_dispatch_15();
1.1 deraadt 1289: }
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