Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.39.2.6
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"
1.39.2.6! miod 62: RCSID("$OpenBSD: clientloop.c,v 1.39.2.5 2001/09/27 00:15:41 miod 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 */
1.39.2.6! miod 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;
1.39.2.5 miod 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())
1.39.2.1 jason 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:
1.39.2.1 jason 370: if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
1.11 markus 371: char buf[100];
1.39.2.1 jason 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);
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:
1.39.2.5 miod 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:
1.39.2.5 miod 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: */
1.39.2.3 jason 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 */
1.39.2.5 miod 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;
1.39.2.1 jason 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:
1.39.2.4 jason 515: case 'R':
516: if (compat20) {
517: if (datafellows & SSH_BUG_NOREKEY)
518: log("Server does not support re-keying");
519: else
520: need_rekeying = 1;
521: }
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. */
1.39.2.5 miod 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\
1.39.2.5 miod 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:
1.39.2.5 miod 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));
1.39.2.4 jason 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: }
1.39.2.5 miod 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: */
1.39.2.3 jason 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:
1.39.2.5 miod 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) {
1.39.2.4 jason 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);
1.39.2.4 jason 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) {
1.39.2.4 jason 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);
1.39.2.4 jason 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:
1.39.2.5 miod 738: static void
1.39.2.1 jason 739: client_process_buffered_input_packets(void)
1.15 markus 740: {
1.39.2.4 jason 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:
1.39.2.5 miod 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:
1.39.2.5 miod 753: static void
1.39.2.4 jason 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);
1.39.2.6! miod 759: channel_cancel_cleanup(id);
1.39.2.4 jason 760: session_closed = 1;
761: if (in_raw_mode())
762: leave_raw_mode();
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
1.39.2.5 miod 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: {
1.39.2.1 jason 775: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 776: double start_time, total_time;
1.39.2.5 miod 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();
1.39.2.1 jason 792: max_fd = MAX(connection_in, connection_out);
793:
794: if (!compat20) {
1.39.2.4 jason 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));
1.39.2.1 jason 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: signal(SIGPIPE, SIG_IGN);
824: if (have_pty)
825: signal(SIGWINCH, window_change_handler);
826:
827: if (have_pty)
828: enter_raw_mode();
829:
1.39.2.1 jason 830: if (compat20) {
831: session_ident = ssh2_chan_id;
1.39.2.5 miod 832: if (escape_char != SSH_ESCAPECHAR_NONE)
1.39.2.1 jason 833: channel_register_filter(session_ident,
834: simple_escape_filter);
1.39.2.4 jason 835: if (session_ident != -1)
836: channel_register_cleanup(session_ident,
837: client_channel_closed);
1.39.2.1 jason 838: } else {
839: /* Check if we should immediately send eof on stdin. */
1.16 markus 840: client_check_initial_eof_on_stdin();
1.39.2.1 jason 841: }
1.30 markus 842:
1.11 markus 843: /* Main loop of the client for the interactive session mode. */
844: while (!quit_pending) {
845:
1.13 markus 846: /* Process buffered packets sent by the server. */
1.11 markus 847: client_process_buffered_input_packets();
848:
1.39.2.4 jason 849: if (compat20 && session_closed && !channel_still_open())
1.16 markus 850: break;
851:
1.39.2.4 jason 852: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.11 markus 853:
1.39.2.4 jason 854: if (rekeying) {
855: debug("rekeying in progress");
856: } else {
857: /*
858: * Make packets of buffered stdin data, and buffer
859: * them for sending to the server.
860: */
861: if (!compat20)
862: client_make_packets_from_stdin_data();
1.11 markus 863:
1.39.2.4 jason 864: /*
865: * Make packets from buffered channel data, and
866: * enqueue them for sending to the server.
867: */
868: if (packet_not_very_much_data_to_write())
869: channel_output_poll();
1.11 markus 870:
1.39.2.4 jason 871: /*
872: * Check if the window size has changed, and buffer a
873: * message about it to the server if so.
874: */
875: client_check_window_change();
1.11 markus 876:
1.39.2.4 jason 877: if (quit_pending)
878: break;
879: }
1.13 markus 880: /*
881: * Wait until we have something to do (something becomes
882: * available on one of the descriptors).
883: */
1.39.2.5 miod 884: max_fd2 = max_fd;
1.39.2.4 jason 885: client_wait_until_can_do_something(&readset, &writeset,
1.39.2.5 miod 886: &max_fd2, &nalloc, rekeying);
1.11 markus 887:
888: if (quit_pending)
889: break;
890:
1.39.2.4 jason 891: /* Do channel operations unless rekeying in progress. */
892: if (!rekeying) {
893: channel_after_select(readset, writeset);
894:
895: if (need_rekeying) {
896: debug("user requests rekeying");
897: xxx_kex->done = 0;
898: kex_send_kexinit(xxx_kex);
899: need_rekeying = 0;
900: }
901: }
1.11 markus 902:
1.17 markus 903: /* Buffer input from the connection. */
1.39.2.1 jason 904: client_process_net_input(readset);
1.17 markus 905:
906: if (quit_pending)
907: break;
1.11 markus 908:
1.17 markus 909: if (!compat20) {
910: /* Buffer data from stdin */
1.39.2.1 jason 911: client_process_input(readset);
1.17 markus 912: /*
913: * Process output to stdout and stderr. Output to
914: * the connection is processed elsewhere (above).
915: */
1.39.2.1 jason 916: client_process_output(writeset);
1.17 markus 917: }
1.11 markus 918:
1.13 markus 919: /* Send as much buffered packet data as possible to the sender. */
1.39.2.1 jason 920: if (FD_ISSET(connection_out, writeset))
1.11 markus 921: packet_write_poll();
922: }
1.39.2.1 jason 923: if (readset)
924: xfree(readset);
925: if (writeset)
926: xfree(writeset);
1.11 markus 927:
928: /* Terminate the session. */
929:
930: /* Stop watching for window change. */
931: if (have_pty)
932: signal(SIGWINCH, SIG_DFL);
933:
1.39.2.5 miod 934: channel_free_all();
935:
936: if (have_pty)
937: leave_raw_mode();
938:
939: /* restore blocking io */
940: if (!isatty(fileno(stdin)))
941: unset_nonblock(fileno(stdin));
942: if (!isatty(fileno(stdout)))
943: unset_nonblock(fileno(stdout));
944: if (!isatty(fileno(stderr)))
945: unset_nonblock(fileno(stderr));
946:
947: if (received_signal) {
948: if (in_non_blocking_mode) /* XXX */
949: leave_non_blocking();
950: fatal("Killed by signal %d.", received_signal);
951: }
1.11 markus 952:
1.13 markus 953: /*
954: * In interactive mode (with pseudo tty) display a message indicating
955: * that the connection has been closed.
956: */
1.11 markus 957: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
958: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
959: buffer_append(&stderr_buffer, buf, strlen(buf));
960: }
1.39.2.5 miod 961:
1.11 markus 962: /* Output any buffered data for stdout. */
963: while (buffer_len(&stdout_buffer) > 0) {
964: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 965: buffer_len(&stdout_buffer));
1.11 markus 966: if (len <= 0) {
967: error("Write failed flushing stdout buffer.");
968: break;
969: }
970: buffer_consume(&stdout_buffer, len);
1.39.2.4 jason 971: stdout_bytes += len;
1.11 markus 972: }
973:
974: /* Output any buffered data for stderr. */
975: while (buffer_len(&stderr_buffer) > 0) {
976: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 977: buffer_len(&stderr_buffer));
1.11 markus 978: if (len <= 0) {
979: error("Write failed flushing stderr buffer.");
980: break;
981: }
982: buffer_consume(&stderr_buffer, len);
1.39.2.4 jason 983: stderr_bytes += len;
1.11 markus 984: }
985:
986: /* Clear and free any buffers. */
987: memset(buf, 0, sizeof(buf));
988: buffer_free(&stdin_buffer);
989: buffer_free(&stdout_buffer);
990: buffer_free(&stderr_buffer);
991:
992: /* Report bytes transferred, and transfer rates. */
993: total_time = get_current_time() - start_time;
994: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
995: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
996: if (total_time > 0)
997: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
998: stdin_bytes / total_time, stdout_bytes / total_time,
999: stderr_bytes / total_time);
1000:
1001: /* Return the exit status of the program. */
1002: debug("Exit status %d", exit_status);
1003: return exit_status;
1.15 markus 1004: }
1005:
1006: /*********/
1007:
1.39.2.5 miod 1008: static void
1.36 markus 1009: client_input_stdout_data(int type, int plen, void *ctxt)
1.15 markus 1010: {
1.39.2.1 jason 1011: u_int data_len;
1.15 markus 1012: char *data = packet_get_string(&data_len);
1013: packet_integrity_check(plen, 4 + data_len, type);
1014: buffer_append(&stdout_buffer, data, data_len);
1015: memset(data, 0, data_len);
1016: xfree(data);
1017: }
1.39.2.5 miod 1018: static void
1.36 markus 1019: client_input_stderr_data(int type, int plen, void *ctxt)
1.15 markus 1020: {
1.39.2.1 jason 1021: u_int data_len;
1.15 markus 1022: char *data = packet_get_string(&data_len);
1023: packet_integrity_check(plen, 4 + data_len, type);
1024: buffer_append(&stderr_buffer, data, data_len);
1025: memset(data, 0, data_len);
1026: xfree(data);
1027: }
1.39.2.5 miod 1028: static void
1.36 markus 1029: client_input_exit_status(int type, int plen, void *ctxt)
1.15 markus 1030: {
1031: packet_integrity_check(plen, 4, type);
1032: exit_status = packet_get_int();
1033: /* Acknowledge the exit. */
1034: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1035: packet_send();
1036: /*
1037: * Must wait for packet to be sent since we are
1038: * exiting the loop.
1039: */
1040: packet_write_wait();
1041: /* Flag that we want to exit. */
1042: quit_pending = 1;
1043: }
1044:
1.39.2.5 miod 1045: static Channel *
1.39.2.1 jason 1046: client_request_forwarded_tcpip(const char *request_type, int rchan)
1047: {
1048: Channel* c = NULL;
1049: char *listen_address, *originator_address;
1050: int listen_port, originator_port;
1.39.2.5 miod 1051: int sock;
1.39.2.1 jason 1052:
1053: /* Get rest of the packet */
1054: listen_address = packet_get_string(NULL);
1055: listen_port = packet_get_int();
1056: originator_address = packet_get_string(NULL);
1057: originator_port = packet_get_int();
1058: packet_done();
1059:
1060: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1061: listen_address, listen_port, originator_address, originator_port);
1062:
1.39.2.5 miod 1063: sock = channel_connect_by_listen_address(listen_port);
1064: if (sock < 0) {
1065: xfree(originator_address);
1066: xfree(listen_address);
1067: return NULL;
1068: }
1069: c = channel_new("forwarded-tcpip",
1070: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1071: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1072: xstrdup(originator_address), 1);
1073: if (c == NULL) {
1074: error("client_request_forwarded_tcpip: channel_new failed");
1075: close(sock);
1.39.2.1 jason 1076: }
1077: xfree(originator_address);
1078: xfree(listen_address);
1079: return c;
1080: }
1081:
1.39.2.5 miod 1082: static Channel*
1.39.2.1 jason 1083: client_request_x11(const char *request_type, int rchan)
1084: {
1085: Channel *c = NULL;
1086: char *originator;
1087: int originator_port;
1.39.2.5 miod 1088: int sock;
1.39.2.1 jason 1089:
1090: if (!options.forward_x11) {
1091: error("Warning: ssh server tried X11 forwarding.");
1092: error("Warning: this is probably a break in attempt by a malicious server.");
1093: return NULL;
1094: }
1095: originator = packet_get_string(NULL);
1096: if (datafellows & SSH_BUG_X11FWD) {
1097: debug2("buggy server: x11 request w/o originator_port");
1098: originator_port = 0;
1099: } else {
1100: originator_port = packet_get_int();
1101: }
1102: packet_done();
1103: /* XXX check permission */
1104: debug("client_request_x11: request from %s %d", originator,
1105: originator_port);
1.39.2.5 miod 1106: xfree(originator);
1.39.2.1 jason 1107: sock = x11_connect_display();
1.39.2.5 miod 1108: if (sock < 0)
1109: return NULL;
1110: c = channel_new("x11",
1111: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1112: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
1113: xstrdup("x11"), 1);
1114: if (c == NULL) {
1115: error("client_request_x11: channel_new failed");
1116: close(sock);
1.39.2.1 jason 1117: }
1.39.2.5 miod 1118: c->force_drain = 1;
1.39.2.1 jason 1119: return c;
1120: }
1121:
1.39.2.5 miod 1122: static Channel*
1.39.2.1 jason 1123: client_request_agent(const char *request_type, int rchan)
1124: {
1125: Channel *c = NULL;
1.39.2.5 miod 1126: int sock;
1.39.2.1 jason 1127:
1128: if (!options.forward_agent) {
1129: error("Warning: ssh server tried agent forwarding.");
1130: error("Warning: this is probably a break in attempt by a malicious server.");
1131: return NULL;
1132: }
1133: sock = ssh_get_authentication_socket();
1.39.2.5 miod 1134: if (sock < 0)
1135: return NULL;
1136: c = channel_new("authentication agent connection",
1137: SSH_CHANNEL_OPEN, sock, sock, -1,
1138: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1139: xstrdup("authentication agent connection"), 1);
1140: if (c == NULL) {
1141: error("client_request_agent: channel_new failed");
1142: close(sock);
1.39.2.1 jason 1143: }
1.39.2.5 miod 1144: c->force_drain = 1;
1.39.2.1 jason 1145: return c;
1146: }
1147:
1.22 markus 1148: /* XXXX move to generic input handler */
1.39.2.5 miod 1149: static void
1.36 markus 1150: client_input_channel_open(int type, int plen, void *ctxt)
1.22 markus 1151: {
1152: Channel *c = NULL;
1153: char *ctype;
1.39.2.1 jason 1154: u_int len;
1.22 markus 1155: int rchan;
1156: int rmaxpack;
1157: int rwindow;
1158:
1159: ctype = packet_get_string(&len);
1160: rchan = packet_get_int();
1161: rwindow = packet_get_int();
1162: rmaxpack = packet_get_int();
1163:
1.24 markus 1164: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1165: ctype, rchan, rwindow, rmaxpack);
1166:
1.39.2.1 jason 1167: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1168: c = client_request_forwarded_tcpip(ctype, rchan);
1169: } else if (strcmp(ctype, "x11") == 0) {
1170: c = client_request_x11(ctype, rchan);
1171: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1172: c = client_request_agent(ctype, rchan);
1.22 markus 1173: }
1174: /* XXX duplicate : */
1175: if (c != NULL) {
1176: debug("confirm %s", ctype);
1177: c->remote_id = rchan;
1178: c->remote_window = rwindow;
1179: c->remote_maxpacket = rmaxpack;
1.39.2.5 miod 1180: if (c->type != SSH_CHANNEL_CONNECTING) {
1181: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1182: packet_put_int(c->remote_id);
1183: packet_put_int(c->self);
1184: packet_put_int(c->local_window);
1185: packet_put_int(c->local_maxpacket);
1186: packet_send();
1187: }
1.22 markus 1188: } else {
1189: debug("failure %s", ctype);
1190: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1191: packet_put_int(rchan);
1192: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.39.2.5 miod 1193: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1194: packet_put_cstring("open failed");
1195: packet_put_cstring("");
1196: }
1.22 markus 1197: packet_send();
1198: }
1199: xfree(ctype);
1200: }
1.39.2.5 miod 1201: static void
1.39.2.1 jason 1202: client_input_channel_req(int type, int plen, void *ctxt)
1203: {
1204: Channel *c = NULL;
1205: int id, reply, success = 0;
1206: char *rtype;
1207:
1208: id = packet_get_int();
1209: rtype = packet_get_string(NULL);
1210: reply = packet_get_char();
1211:
1212: debug("client_input_channel_req: channel %d rtype %s reply %d",
1213: id, rtype, reply);
1214:
1215: if (session_ident == -1) {
1216: error("client_input_channel_req: no channel %d", session_ident);
1217: } else if (id != session_ident) {
1218: error("client_input_channel_req: channel %d: wrong channel: %d",
1219: session_ident, id);
1220: }
1221: c = channel_lookup(id);
1222: if (c == NULL) {
1223: error("client_input_channel_req: channel %d: unknown channel", id);
1224: } else if (strcmp(rtype, "exit-status") == 0) {
1225: success = 1;
1226: exit_status = packet_get_int();
1227: packet_done();
1228: }
1229: if (reply) {
1230: packet_start(success ?
1231: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1232: packet_put_int(c->remote_id);
1233: packet_send();
1234: }
1235: xfree(rtype);
1236: }
1.22 markus 1237:
1.39.2.5 miod 1238: static void
1.39.2.1 jason 1239: client_init_dispatch_20(void)
1.16 markus 1240: {
1241: dispatch_init(&dispatch_protocol_error);
1242: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1243: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1244: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1245: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1246: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1247: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1248: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.39.2.1 jason 1249: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1250: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.39.2.4 jason 1251:
1252: /* rekeying */
1253: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.16 markus 1254: }
1.39.2.5 miod 1255: static void
1.39.2.1 jason 1256: client_init_dispatch_13(void)
1.15 markus 1257: {
1258: dispatch_init(NULL);
1259: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1260: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1261: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1262: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1263: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1264: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1265: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1266: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1267: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1268:
1269: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1270: &auth_input_open_request : &deny_input_open);
1271: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1272: &x11_input_open : &deny_input_open);
1.15 markus 1273: }
1.39.2.5 miod 1274: static void
1.39.2.1 jason 1275: client_init_dispatch_15(void)
1.15 markus 1276: {
1277: client_init_dispatch_13();
1278: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1279: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1280: }
1.39.2.5 miod 1281: static void
1.39.2.1 jason 1282: client_init_dispatch(void)
1.15 markus 1283: {
1.16 markus 1284: if (compat20)
1285: client_init_dispatch_20();
1286: else if (compat13)
1.15 markus 1287: client_init_dispatch_13();
1288: else
1289: client_init_dispatch_15();
1.1 deraadt 1290: }
![[BACK]](/icons/back.gif){kind=icon}
Return to clientloop.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh