Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.102
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"
1.102 ! markus 62: RCSID("$OpenBSD: clientloop.c,v 1.101 2002/06/09 13:32:01 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"
1.97 jakob 84: #include "readpass.h"
1.39 markus 85:
86: /* import options */
87: extern Options options;
88:
1.1 deraadt 89: /* Flag indicating that stdin should be redirected from /dev/null. */
90: extern int stdin_null_flag;
91:
1.13 markus 92: /*
93: * Name of the host we are connecting to. This is the name given on the
94: * command line, or the HostName specified for the user-supplied name in a
95: * configuration file.
96: */
1.1 deraadt 97: extern char *host;
98:
1.13 markus 99: /*
100: * Flag to indicate that we have received a window change signal which has
101: * not yet been processed. This will cause a message indicating the new
102: * window size to be sent to the server a little later. This is volatile
103: * because this is updated in a signal handler.
104: */
1.88 markus 105: static volatile sig_atomic_t received_window_change_signal = 0;
106: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 107:
108: /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
109: static int in_non_blocking_mode = 0;
110:
111: /* Common data for the client loop code. */
1.31 markus 112: static int quit_pending; /* Set to non-zero to quit the client loop. */
113: static int escape_char; /* Escape character. */
1.11 markus 114: static int escape_pending; /* Last character was the escape character */
115: static int last_was_cr; /* Last character was a newline. */
116: static int exit_status; /* Used to store the exit status of the command. */
117: static int stdin_eof; /* EOF has been encountered on standard error. */
118: static Buffer stdin_buffer; /* Buffer for stdin data. */
119: static Buffer stdout_buffer; /* Buffer for stdout data. */
120: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 121: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
122: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 123: static int connection_in; /* Connection to server (input). */
124: static int connection_out; /* Connection to server (output). */
1.56 markus 125: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 126: static int session_closed = 0; /* In SSH2: login session closed. */
1.1 deraadt 127:
1.77 itojun 128: static void client_init_dispatch(void);
1.16 markus 129: int session_ident = -1;
130:
1.54 markus 131: /*XXX*/
132: extern Kex *xxx_kex;
133:
1.1 deraadt 134: /* Restores stdin to blocking mode. */
135:
1.77 itojun 136: static void
1.49 itojun 137: leave_non_blocking(void)
1.1 deraadt 138: {
1.11 markus 139: if (in_non_blocking_mode) {
140: (void) fcntl(fileno(stdin), F_SETFL, 0);
141: in_non_blocking_mode = 0;
142: fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL);
143: }
1.1 deraadt 144: }
145:
1.11 markus 146: /* Puts stdin terminal in non-blocking mode. */
147:
1.77 itojun 148: static void
1.49 itojun 149: enter_non_blocking(void)
1.1 deraadt 150: {
1.11 markus 151: in_non_blocking_mode = 1;
152: (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
153: fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL);
1.1 deraadt 154: }
155:
1.13 markus 156: /*
157: * Signal handler for the window change signal (SIGWINCH). This just sets a
158: * flag indicating that the window has changed.
159: */
1.1 deraadt 160:
1.77 itojun 161: static void
1.11 markus 162: window_change_handler(int sig)
1.1 deraadt 163: {
1.11 markus 164: received_window_change_signal = 1;
165: signal(SIGWINCH, window_change_handler);
1.1 deraadt 166: }
167:
1.13 markus 168: /*
169: * Signal handler for signals that cause the program to terminate. These
170: * signals must be trapped to restore terminal modes.
171: */
1.1 deraadt 172:
1.77 itojun 173: static void
1.11 markus 174: signal_handler(int sig)
1.1 deraadt 175: {
1.75 markus 176: received_signal = sig;
177: quit_pending = 1;
1.1 deraadt 178: }
179:
1.13 markus 180: /*
181: * Returns current time in seconds from Jan 1, 1970 with the maximum
182: * available resolution.
183: */
1.1 deraadt 184:
1.77 itojun 185: static double
1.49 itojun 186: get_current_time(void)
1.1 deraadt 187: {
1.11 markus 188: struct timeval tv;
189: gettimeofday(&tv, NULL);
190: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.1 deraadt 191: }
192:
1.13 markus 193: /*
194: * This is called when the interactive is entered. This checks if there is
195: * an EOF coming on stdin. We must check this explicitly, as select() does
196: * not appear to wake up when redirecting from /dev/null.
197: */
1.1 deraadt 198:
1.77 itojun 199: static void
1.49 itojun 200: client_check_initial_eof_on_stdin(void)
1.1 deraadt 201: {
1.11 markus 202: int len;
203: char buf[1];
1.1 deraadt 204:
1.13 markus 205: /*
206: * If standard input is to be "redirected from /dev/null", we simply
207: * mark that we have seen an EOF and send an EOF message to the
208: * server. Otherwise, we try to read a single character; it appears
209: * that for some files, such /dev/null, select() never wakes up for
210: * read for this descriptor, which means that we never get EOF. This
211: * way we will get the EOF if stdin comes from /dev/null or similar.
212: */
1.11 markus 213: if (stdin_null_flag) {
214: /* Fake EOF on stdin. */
215: debug("Sending eof.");
216: stdin_eof = 1;
217: packet_start(SSH_CMSG_EOF);
218: packet_send();
219: } else {
220: enter_non_blocking();
221:
222: /* Check for immediate EOF on stdin. */
223: len = read(fileno(stdin), buf, 1);
224: if (len == 0) {
1.13 markus 225: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 226: debug("Sending eof.");
227: stdin_eof = 1;
228: packet_start(SSH_CMSG_EOF);
229: packet_send();
230: } else if (len > 0) {
1.13 markus 231: /*
232: * Got data. We must store the data in the buffer,
233: * and also process it as an escape character if
234: * appropriate.
235: */
1.42 markus 236: if ((u_char) buf[0] == escape_char)
1.11 markus 237: escape_pending = 1;
1.52 markus 238: else
1.11 markus 239: buffer_append(&stdin_buffer, buf, 1);
240: }
241: leave_non_blocking();
242: }
1.1 deraadt 243: }
244:
245:
1.13 markus 246: /*
247: * Make packets from buffered stdin data, and buffer them for sending to the
248: * connection.
249: */
1.1 deraadt 250:
1.77 itojun 251: static void
1.49 itojun 252: client_make_packets_from_stdin_data(void)
1.1 deraadt 253: {
1.42 markus 254: u_int len;
1.1 deraadt 255:
1.11 markus 256: /* Send buffered stdin data to the server. */
257: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 258: packet_not_very_much_data_to_write()) {
1.11 markus 259: len = buffer_len(&stdin_buffer);
260: /* Keep the packets at reasonable size. */
261: if (len > packet_get_maxsize())
262: len = packet_get_maxsize();
263: packet_start(SSH_CMSG_STDIN_DATA);
264: packet_put_string(buffer_ptr(&stdin_buffer), len);
265: packet_send();
266: buffer_consume(&stdin_buffer, len);
1.52 markus 267: stdin_bytes += len;
1.11 markus 268: /* If we have a pending EOF, send it now. */
269: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
270: packet_start(SSH_CMSG_EOF);
271: packet_send();
272: }
1.1 deraadt 273: }
274: }
275:
1.13 markus 276: /*
277: * Checks if the client window has changed, and sends a packet about it to
278: * the server if so. The actual change is detected elsewhere (by a software
279: * interrupt on Unix); this just checks the flag and sends a message if
280: * appropriate.
281: */
1.1 deraadt 282:
1.77 itojun 283: static void
1.49 itojun 284: client_check_window_change(void)
1.1 deraadt 285: {
1.16 markus 286: struct winsize ws;
287:
288: if (! received_window_change_signal)
289: return;
290: /** XXX race */
291: received_window_change_signal = 0;
292:
293: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
294: return;
295:
1.37 markus 296: debug2("client_check_window_change: changed");
1.16 markus 297:
298: if (compat20) {
299: channel_request_start(session_ident, "window-change", 0);
300: packet_put_int(ws.ws_col);
301: packet_put_int(ws.ws_row);
302: packet_put_int(ws.ws_xpixel);
303: packet_put_int(ws.ws_ypixel);
304: packet_send();
305: } else {
306: packet_start(SSH_CMSG_WINDOW_SIZE);
307: packet_put_int(ws.ws_row);
308: packet_put_int(ws.ws_col);
309: packet_put_int(ws.ws_xpixel);
310: packet_put_int(ws.ws_ypixel);
311: packet_send();
1.1 deraadt 312: }
313: }
314:
1.13 markus 315: /*
316: * Waits until the client can do something (some data becomes available on
317: * one of the file descriptors).
318: */
1.1 deraadt 319:
1.77 itojun 320: static void
1.46 markus 321: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.81 markus 322: int *maxfdp, int *nallocp, int rekeying)
1.11 markus 323: {
1.46 markus 324: /* Add any selections by the channel mechanism. */
1.81 markus 325: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 326:
1.16 markus 327: if (!compat20) {
1.17 markus 328: /* Read from the connection, unless our buffers are full. */
1.16 markus 329: if (buffer_len(&stdout_buffer) < buffer_high &&
330: buffer_len(&stderr_buffer) < buffer_high &&
331: channel_not_very_much_buffered_data())
1.46 markus 332: FD_SET(connection_in, *readsetp);
1.17 markus 333: /*
334: * Read from stdin, unless we have seen EOF or have very much
335: * buffered data to send to the server.
336: */
337: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 338: FD_SET(fileno(stdin), *readsetp);
1.17 markus 339:
340: /* Select stdout/stderr if have data in buffer. */
341: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 342: FD_SET(fileno(stdout), *writesetp);
1.17 markus 343: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 344: FD_SET(fileno(stderr), *writesetp);
1.16 markus 345: } else {
1.71 markus 346: /* channel_prepare_select could have closed the last channel */
1.84 markus 347: if (session_closed && !channel_still_open() &&
348: !packet_have_data_to_write()) {
349: /* clear mask since we did not call select() */
1.87 markus 350: memset(*readsetp, 0, *nallocp);
351: memset(*writesetp, 0, *nallocp);
1.84 markus 352: return;
1.71 markus 353: } else {
354: FD_SET(connection_in, *readsetp);
355: }
1.16 markus 356: }
1.11 markus 357:
358: /* Select server connection if have data to write to the server. */
359: if (packet_have_data_to_write())
1.46 markus 360: FD_SET(connection_out, *writesetp);
1.11 markus 361:
1.13 markus 362: /*
363: * Wait for something to happen. This will suspend the process until
364: * some selected descriptor can be read, written, or has some other
365: * event pending. Note: if you want to implement SSH_MSG_IGNORE
366: * messages to fool traffic analysis, this might be the place to do
367: * it: just have a random timeout for the select, and send a random
368: * SSH_MSG_IGNORE packet when the timeout expires.
369: */
1.11 markus 370:
1.46 markus 371: if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
1.11 markus 372: char buf[100];
1.51 markus 373:
374: /*
375: * We have to clear the select masks, because we return.
376: * We have to return, because the mainloop checks for the flags
377: * set by the signal handlers.
378: */
1.87 markus 379: memset(*readsetp, 0, *nallocp);
380: memset(*writesetp, 0, *nallocp);
1.50 deraadt 381:
1.11 markus 382: if (errno == EINTR)
383: return;
384: /* Note: we might still have data in the buffers. */
385: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
386: buffer_append(&stderr_buffer, buf, strlen(buf));
387: quit_pending = 1;
388: }
389: }
390:
1.77 itojun 391: static void
1.31 markus 392: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 393: {
1.11 markus 394: struct winsize oldws, newws;
395:
396: /* Flush stdout and stderr buffers. */
1.31 markus 397: if (buffer_len(bout) > 0)
398: atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
399: if (buffer_len(berr) > 0)
400: atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 401:
402: leave_raw_mode();
403:
1.13 markus 404: /*
405: * Free (and clear) the buffer to reduce the amount of data that gets
406: * written to swap.
407: */
1.31 markus 408: buffer_free(bin);
409: buffer_free(bout);
410: buffer_free(berr);
1.11 markus 411:
412: /* Save old window size. */
413: ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
414:
415: /* Send the suspend signal to the program itself. */
416: kill(getpid(), SIGTSTP);
417:
418: /* Check if the window size has changed. */
419: if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
420: (oldws.ws_row != newws.ws_row ||
1.90 deraadt 421: oldws.ws_col != newws.ws_col ||
422: oldws.ws_xpixel != newws.ws_xpixel ||
423: oldws.ws_ypixel != newws.ws_ypixel))
1.11 markus 424: received_window_change_signal = 1;
425:
426: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 427: buffer_init(bin);
428: buffer_init(bout);
429: buffer_init(berr);
1.11 markus 430:
431: enter_raw_mode();
432: }
433:
1.77 itojun 434: static void
1.17 markus 435: client_process_net_input(fd_set * readset)
1.11 markus 436: {
1.17 markus 437: int len;
438: char buf[8192];
1.11 markus 439:
1.13 markus 440: /*
441: * Read input from the server, and add any such data to the buffer of
442: * the packet subsystem.
443: */
1.11 markus 444: if (FD_ISSET(connection_in, readset)) {
445: /* Read as much as possible. */
446: len = read(connection_in, buf, sizeof(buf));
447: if (len == 0) {
448: /* Received EOF. The remote host has closed the connection. */
449: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
450: host);
1.1 deraadt 451: buffer_append(&stderr_buffer, buf, strlen(buf));
452: quit_pending = 1;
453: return;
1.11 markus 454: }
1.13 markus 455: /*
456: * There is a kernel bug on Solaris that causes select to
457: * sometimes wake up even though there is no data available.
458: */
1.53 millert 459: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 460: len = 0;
461:
462: if (len < 0) {
463: /* An error has encountered. Perhaps there is a network problem. */
464: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
465: host, strerror(errno));
466: buffer_append(&stderr_buffer, buf, strlen(buf));
467: quit_pending = 1;
468: return;
469: }
470: packet_process_incoming(buf, len);
471: }
1.17 markus 472: }
1.16 markus 473:
1.97 jakob 474: static void
1.99 markus 475: process_cmdline(void)
1.97 jakob 476: {
477: void (*handler)(int);
478: char *s, *cmd;
479: u_short fwd_port, fwd_host_port;
480: char buf[1024], sfwd_port[6], sfwd_host_port[6];
481: int local = 0;
482:
483: leave_raw_mode();
1.101 markus 484: handler = signal(SIGINT, SIG_IGN);
1.99 markus 485: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 486: if (s == NULL)
487: goto out;
488: while (*s && isspace(*s))
489: s++;
490: if (*s == 0)
491: goto out;
492: if (strlen(s) < 2 || s[0] != '-' || !(s[1] == 'L' || s[1] == 'R')) {
1.99 markus 493: log("Invalid command.");
1.97 jakob 494: goto out;
495: }
496: if (s[1] == 'L')
497: local = 1;
498: if (!local && !compat20) {
1.99 markus 499: log("Not supported for SSH protocol version 1.");
1.97 jakob 500: goto out;
501: }
502: s += 2;
503: while (*s && isspace(*s))
504: s++;
505:
506: if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]",
507: sfwd_port, buf, sfwd_host_port) != 3 &&
508: sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]",
509: sfwd_port, buf, sfwd_host_port) != 3) {
1.99 markus 510: log("Bad forwarding specification.");
1.97 jakob 511: goto out;
512: }
513: if ((fwd_port = a2port(sfwd_port)) == 0 ||
514: (fwd_host_port = a2port(sfwd_host_port)) == 0) {
1.99 markus 515: log("Bad forwarding port(s).");
1.97 jakob 516: goto out;
517: }
518: if (local) {
1.99 markus 519: if (channel_setup_local_fwd_listener(fwd_port, buf,
520: fwd_host_port, options.gateway_ports) < 0) {
521: log("Port forwarding failed.");
1.97 jakob 522: goto out;
523: }
524: } else
525: channel_request_remote_forwarding(fwd_port, buf,
526: fwd_host_port);
1.99 markus 527: log("Forwarding port.");
1.97 jakob 528: out:
529: signal(SIGINT, handler);
530: enter_raw_mode();
531: if (cmd)
532: xfree(cmd);
533: }
534:
1.31 markus 535: /* process the characters one by one */
1.77 itojun 536: static int
1.31 markus 537: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
538: {
1.32 markus 539: char string[1024];
1.31 markus 540: pid_t pid;
541: int bytes = 0;
1.42 markus 542: u_int i;
543: u_char ch;
1.31 markus 544: char *s;
545:
546: for (i = 0; i < len; i++) {
547: /* Get one character at a time. */
548: ch = buf[i];
549:
550: if (escape_pending) {
551: /* We have previously seen an escape character. */
552: /* Clear the flag now. */
553: escape_pending = 0;
554:
555: /* Process the escaped character. */
556: switch (ch) {
557: case '.':
558: /* Terminate the connection. */
1.32 markus 559: snprintf(string, sizeof string, "%c.\r\n", escape_char);
560: buffer_append(berr, string, strlen(string));
1.31 markus 561:
562: quit_pending = 1;
563: return -1;
564:
565: case 'Z' - 64:
566: /* Suspend the program. */
567: /* Print a message to that effect to the user. */
1.32 markus 568: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
569: buffer_append(berr, string, strlen(string));
1.31 markus 570:
571: /* Restore terminal modes and suspend. */
572: client_suspend_self(bin, bout, berr);
573:
574: /* We have been continued. */
575: continue;
576:
1.54 markus 577: case 'R':
1.59 markus 578: if (compat20) {
579: if (datafellows & SSH_BUG_NOREKEY)
580: log("Server does not support re-keying");
581: else
582: need_rekeying = 1;
583: }
1.54 markus 584: continue;
585:
1.31 markus 586: case '&':
587: /*
588: * Detach the program (continue to serve connections,
589: * but put in background and no more new connections).
590: */
591: /* Restore tty modes. */
592: leave_raw_mode();
593:
594: /* Stop listening for new connections. */
1.86 markus 595: channel_stop_listening();
1.31 markus 596:
1.86 markus 597: snprintf(string, sizeof string,
598: "%c& [backgrounded]\n", escape_char);
599: buffer_append(berr, string, strlen(string));
1.31 markus 600:
601: /* Fork into background. */
602: pid = fork();
603: if (pid < 0) {
604: error("fork: %.100s", strerror(errno));
605: continue;
606: }
607: if (pid != 0) { /* This is the parent. */
608: /* The parent just exits. */
609: exit(0);
610: }
611: /* The child continues serving connections. */
1.86 markus 612: if (compat20) {
613: buffer_append(bin, "\004", 1);
614: /* fake EOF on stdin */
615: return -1;
616: } else if (!stdin_eof) {
617: /*
618: * Sending SSH_CMSG_EOF alone does not always appear
619: * to be enough. So we try to send an EOF character
620: * first.
621: */
622: packet_start(SSH_CMSG_STDIN_DATA);
623: packet_put_string("\004", 1);
624: packet_send();
625: /* Close stdin. */
626: stdin_eof = 1;
627: if (buffer_len(bin) == 0) {
628: packet_start(SSH_CMSG_EOF);
629: packet_send();
630: }
631: }
632: continue;
1.31 markus 633:
634: case '?':
1.32 markus 635: snprintf(string, sizeof string,
1.31 markus 636: "%c?\r\n\
637: Supported escape sequences:\r\n\
638: ~. - terminate connection\r\n\
1.97 jakob 639: ~C - open a command line\r\n\
1.72 stevesk 640: ~R - Request rekey (SSH protocol 2 only)\r\n\
1.31 markus 641: ~^Z - suspend ssh\r\n\
642: ~# - list forwarded connections\r\n\
643: ~& - background ssh (when waiting for connections to terminate)\r\n\
644: ~? - this message\r\n\
645: ~~ - send the escape character by typing it twice\r\n\
646: (Note that escapes are only recognized immediately after newline.)\r\n",
647: escape_char);
1.32 markus 648: buffer_append(berr, string, strlen(string));
1.31 markus 649: continue;
650:
651: case '#':
1.32 markus 652: snprintf(string, sizeof string, "%c#\r\n", escape_char);
653: buffer_append(berr, string, strlen(string));
1.31 markus 654: s = channel_open_message();
655: buffer_append(berr, s, strlen(s));
656: xfree(s);
1.97 jakob 657: continue;
658:
659: case 'C':
1.99 markus 660: process_cmdline();
1.31 markus 661: continue;
662:
663: default:
664: if (ch != escape_char) {
665: buffer_put_char(bin, escape_char);
666: bytes++;
667: }
668: /* Escaped characters fall through here */
669: break;
670: }
671: } else {
672: /*
673: * The previous character was not an escape char. Check if this
674: * is an escape.
675: */
676: if (last_was_cr && ch == escape_char) {
677: /* It is. Set the flag and continue to next character. */
678: escape_pending = 1;
679: continue;
680: }
681: }
682:
683: /*
684: * Normal character. Record whether it was a newline,
685: * and append it to the buffer.
686: */
687: last_was_cr = (ch == '\r' || ch == '\n');
688: buffer_put_char(bin, ch);
689: bytes++;
690: }
691: return bytes;
692: }
693:
1.77 itojun 694: static void
1.17 markus 695: client_process_input(fd_set * readset)
696: {
1.21 deraadt 697: int len;
1.31 markus 698: char buf[8192];
1.16 markus 699:
1.11 markus 700: /* Read input from stdin. */
701: if (FD_ISSET(fileno(stdin), readset)) {
702: /* Read as much as possible. */
703: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 704: if (len < 0 && (errno == EAGAIN || errno == EINTR))
705: return; /* we'll try again later */
1.11 markus 706: if (len <= 0) {
1.13 markus 707: /*
708: * Received EOF or error. They are treated
709: * similarly, except that an error message is printed
710: * if it was an error condition.
711: */
1.11 markus 712: if (len < 0) {
713: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
714: buffer_append(&stderr_buffer, buf, strlen(buf));
715: }
716: /* Mark that we have seen EOF. */
717: stdin_eof = 1;
1.13 markus 718: /*
719: * Send an EOF message to the server unless there is
720: * data in the buffer. If there is data in the
721: * buffer, no message will be sent now. Code
722: * elsewhere will send the EOF when the buffer
723: * becomes empty if stdin_eof is set.
724: */
1.11 markus 725: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 726: packet_start(SSH_CMSG_EOF);
727: packet_send();
1.11 markus 728: }
1.72 stevesk 729: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 730: /*
731: * Normal successful read, and no escape character.
732: * Just append the data to buffer.
733: */
1.11 markus 734: buffer_append(&stdin_buffer, buf, len);
735: } else {
1.13 markus 736: /*
737: * Normal, successful read. But we have an escape character
738: * and have to process the characters one by one.
739: */
1.52 markus 740: if (process_escapes(&stdin_buffer, &stdout_buffer,
741: &stderr_buffer, buf, len) == -1)
1.31 markus 742: return;
1.11 markus 743: }
744: }
745: }
746:
1.77 itojun 747: static void
1.11 markus 748: client_process_output(fd_set * writeset)
749: {
750: int len;
751: char buf[100];
1.1 deraadt 752:
1.11 markus 753: /* Write buffered output to stdout. */
754: if (FD_ISSET(fileno(stdout), writeset)) {
755: /* Write as much data as possible. */
756: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 757: buffer_len(&stdout_buffer));
1.11 markus 758: if (len <= 0) {
1.64 markus 759: if (errno == EINTR || errno == EAGAIN)
1.11 markus 760: len = 0;
761: else {
1.13 markus 762: /*
763: * An error or EOF was encountered. Put an
764: * error message to stderr buffer.
765: */
1.11 markus 766: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
767: buffer_append(&stderr_buffer, buf, strlen(buf));
768: quit_pending = 1;
769: return;
770: }
771: }
772: /* Consume printed data from the buffer. */
773: buffer_consume(&stdout_buffer, len);
1.57 markus 774: stdout_bytes += len;
1.11 markus 775: }
776: /* Write buffered output to stderr. */
777: if (FD_ISSET(fileno(stderr), writeset)) {
778: /* Write as much data as possible. */
779: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 780: buffer_len(&stderr_buffer));
1.11 markus 781: if (len <= 0) {
1.64 markus 782: if (errno == EINTR || errno == EAGAIN)
1.11 markus 783: len = 0;
784: else {
1.13 markus 785: /* EOF or error, but can't even print error message. */
1.11 markus 786: quit_pending = 1;
787: return;
788: }
789: }
790: /* Consume printed characters from the buffer. */
791: buffer_consume(&stderr_buffer, len);
1.57 markus 792: stderr_bytes += len;
1.11 markus 793: }
1.1 deraadt 794: }
795:
1.13 markus 796: /*
1.15 markus 797: * Get packets from the connection input buffer, and process them as long as
798: * there are packets available.
799: *
800: * Any unknown packets received during the actual
801: * session cause the session to terminate. This is
802: * intended to make debugging easier since no
803: * confirmations are sent. Any compatible protocol
804: * extensions must be negotiated during the
805: * preparatory phase.
806: */
807:
1.77 itojun 808: static void
1.49 itojun 809: client_process_buffered_input_packets(void)
1.15 markus 810: {
1.54 markus 811: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 812: }
813:
1.31 markus 814: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 815:
1.77 itojun 816: static int
1.31 markus 817: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 818: {
1.31 markus 819: /* XXX we assume c->extended is writeable */
820: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 821: }
822:
1.77 itojun 823: static void
1.60 markus 824: client_channel_closed(int id, void *arg)
825: {
826: if (id != session_ident)
827: error("client_channel_closed: id %d != session_ident %d",
828: id, session_ident);
1.83 markus 829: channel_cancel_cleanup(id);
1.60 markus 830: session_closed = 1;
1.62 stevesk 831: if (in_raw_mode())
1.61 markus 832: leave_raw_mode();
1.60 markus 833: }
834:
1.15 markus 835: /*
1.13 markus 836: * Implements the interactive session with the server. This is called after
837: * the user has been authenticated, and a command has been started on the
1.72 stevesk 838: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
839: * used as an escape character for terminating or suspending the session.
1.13 markus 840: */
1.1 deraadt 841:
1.20 markus 842: int
1.30 markus 843: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 844: {
1.46 markus 845: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 846: double start_time, total_time;
1.81 markus 847: int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0;
1.11 markus 848: char buf[100];
849:
850: debug("Entering interactive session.");
851:
852: start_time = get_current_time();
853:
854: /* Initialize variables. */
855: escape_pending = 0;
856: last_was_cr = 1;
857: exit_status = -1;
858: stdin_eof = 0;
859: buffer_high = 64 * 1024;
860: connection_in = packet_get_connection_in();
861: connection_out = packet_get_connection_out();
1.46 markus 862: max_fd = MAX(connection_in, connection_out);
863:
864: if (!compat20) {
1.63 markus 865: /* enable nonblocking unless tty */
866: if (!isatty(fileno(stdin)))
867: set_nonblock(fileno(stdin));
868: if (!isatty(fileno(stdout)))
869: set_nonblock(fileno(stdout));
870: if (!isatty(fileno(stderr)))
871: set_nonblock(fileno(stderr));
1.46 markus 872: max_fd = MAX(max_fd, fileno(stdin));
873: max_fd = MAX(max_fd, fileno(stdout));
874: max_fd = MAX(max_fd, fileno(stderr));
875: }
1.11 markus 876: stdin_bytes = 0;
877: stdout_bytes = 0;
878: stderr_bytes = 0;
879: quit_pending = 0;
880: escape_char = escape_char_arg;
881:
882: /* Initialize buffers. */
883: buffer_init(&stdin_buffer);
884: buffer_init(&stdout_buffer);
885: buffer_init(&stderr_buffer);
886:
1.15 markus 887: client_init_dispatch();
888:
1.11 markus 889: /* Set signal handlers to restore non-blocking mode. */
890: signal(SIGINT, signal_handler);
891: signal(SIGQUIT, signal_handler);
892: signal(SIGTERM, signal_handler);
893: if (have_pty)
894: signal(SIGWINCH, window_change_handler);
895:
896: if (have_pty)
897: enter_raw_mode();
898:
1.48 markus 899: if (compat20) {
900: session_ident = ssh2_chan_id;
1.72 stevesk 901: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 902: channel_register_filter(session_ident,
903: simple_escape_filter);
1.60 markus 904: if (session_ident != -1)
905: channel_register_cleanup(session_ident,
906: client_channel_closed);
1.48 markus 907: } else {
908: /* Check if we should immediately send eof on stdin. */
1.16 markus 909: client_check_initial_eof_on_stdin();
1.48 markus 910: }
1.30 markus 911:
1.11 markus 912: /* Main loop of the client for the interactive session mode. */
913: while (!quit_pending) {
914:
1.13 markus 915: /* Process buffered packets sent by the server. */
1.11 markus 916: client_process_buffered_input_packets();
917:
1.60 markus 918: if (compat20 && session_closed && !channel_still_open())
919: break;
920:
1.56 markus 921: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 922:
1.56 markus 923: if (rekeying) {
924: debug("rekeying in progress");
925: } else {
926: /*
927: * Make packets of buffered stdin data, and buffer
928: * them for sending to the server.
929: */
930: if (!compat20)
931: client_make_packets_from_stdin_data();
1.11 markus 932:
1.56 markus 933: /*
934: * Make packets from buffered channel data, and
935: * enqueue them for sending to the server.
936: */
937: if (packet_not_very_much_data_to_write())
938: channel_output_poll();
1.11 markus 939:
1.56 markus 940: /*
941: * Check if the window size has changed, and buffer a
942: * message about it to the server if so.
943: */
944: client_check_window_change();
1.11 markus 945:
1.56 markus 946: if (quit_pending)
947: break;
948: }
1.13 markus 949: /*
950: * Wait until we have something to do (something becomes
951: * available on one of the descriptors).
952: */
1.81 markus 953: max_fd2 = max_fd;
1.56 markus 954: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 955: &max_fd2, &nalloc, rekeying);
1.11 markus 956:
957: if (quit_pending)
958: break;
959:
1.56 markus 960: /* Do channel operations unless rekeying in progress. */
961: if (!rekeying) {
962: channel_after_select(readset, writeset);
963:
964: if (need_rekeying) {
965: debug("user requests rekeying");
966: xxx_kex->done = 0;
967: kex_send_kexinit(xxx_kex);
968: need_rekeying = 0;
969: }
970: }
1.11 markus 971:
1.17 markus 972: /* Buffer input from the connection. */
1.46 markus 973: client_process_net_input(readset);
1.17 markus 974:
975: if (quit_pending)
976: break;
1.11 markus 977:
1.17 markus 978: if (!compat20) {
979: /* Buffer data from stdin */
1.46 markus 980: client_process_input(readset);
1.17 markus 981: /*
982: * Process output to stdout and stderr. Output to
983: * the connection is processed elsewhere (above).
984: */
1.46 markus 985: client_process_output(writeset);
1.17 markus 986: }
1.11 markus 987:
1.13 markus 988: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 989: if (FD_ISSET(connection_out, writeset))
1.11 markus 990: packet_write_poll();
991: }
1.46 markus 992: if (readset)
993: xfree(readset);
994: if (writeset)
995: xfree(writeset);
1.11 markus 996:
997: /* Terminate the session. */
998:
999: /* Stop watching for window change. */
1000: if (have_pty)
1001: signal(SIGWINCH, SIG_DFL);
1002:
1.76 markus 1003: channel_free_all();
1.11 markus 1004:
1.75 markus 1005: if (have_pty)
1006: leave_raw_mode();
1007:
1008: /* restore blocking io */
1009: if (!isatty(fileno(stdin)))
1010: unset_nonblock(fileno(stdin));
1011: if (!isatty(fileno(stdout)))
1012: unset_nonblock(fileno(stdout));
1013: if (!isatty(fileno(stderr)))
1014: unset_nonblock(fileno(stderr));
1015:
1016: if (received_signal) {
1017: if (in_non_blocking_mode) /* XXX */
1018: leave_non_blocking();
1.89 itojun 1019: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1020: }
1021:
1.13 markus 1022: /*
1023: * In interactive mode (with pseudo tty) display a message indicating
1024: * that the connection has been closed.
1025: */
1.11 markus 1026: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1027: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1028: buffer_append(&stderr_buffer, buf, strlen(buf));
1029: }
1.70 markus 1030:
1.11 markus 1031: /* Output any buffered data for stdout. */
1.70 markus 1032: while (buffer_len(&stdout_buffer) > 0) {
1033: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1034: buffer_len(&stdout_buffer));
1.70 markus 1035: if (len <= 0) {
1.11 markus 1036: error("Write failed flushing stdout buffer.");
1.70 markus 1037: break;
1038: }
1.11 markus 1039: buffer_consume(&stdout_buffer, len);
1.57 markus 1040: stdout_bytes += len;
1.11 markus 1041: }
1042:
1043: /* Output any buffered data for stderr. */
1.70 markus 1044: while (buffer_len(&stderr_buffer) > 0) {
1045: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1046: buffer_len(&stderr_buffer));
1.70 markus 1047: if (len <= 0) {
1.11 markus 1048: error("Write failed flushing stderr buffer.");
1.70 markus 1049: break;
1050: }
1.11 markus 1051: buffer_consume(&stderr_buffer, len);
1.57 markus 1052: stderr_bytes += len;
1.11 markus 1053: }
1054:
1055: /* Clear and free any buffers. */
1056: memset(buf, 0, sizeof(buf));
1057: buffer_free(&stdin_buffer);
1058: buffer_free(&stdout_buffer);
1059: buffer_free(&stderr_buffer);
1060:
1061: /* Report bytes transferred, and transfer rates. */
1062: total_time = get_current_time() - start_time;
1063: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1064: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1065: if (total_time > 0)
1066: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1067: stdin_bytes / total_time, stdout_bytes / total_time,
1068: stderr_bytes / total_time);
1.11 markus 1069:
1070: /* Return the exit status of the program. */
1071: debug("Exit status %d", exit_status);
1072: return exit_status;
1.15 markus 1073: }
1074:
1075: /*********/
1076:
1.77 itojun 1077: static void
1.94 markus 1078: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1079: {
1.42 markus 1080: u_int data_len;
1.15 markus 1081: char *data = packet_get_string(&data_len);
1.93 markus 1082: packet_check_eom();
1.15 markus 1083: buffer_append(&stdout_buffer, data, data_len);
1084: memset(data, 0, data_len);
1085: xfree(data);
1086: }
1.77 itojun 1087: static void
1.94 markus 1088: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1089: {
1.42 markus 1090: u_int data_len;
1.15 markus 1091: char *data = packet_get_string(&data_len);
1.93 markus 1092: packet_check_eom();
1.15 markus 1093: buffer_append(&stderr_buffer, data, data_len);
1094: memset(data, 0, data_len);
1095: xfree(data);
1096: }
1.77 itojun 1097: static void
1.94 markus 1098: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1099: {
1100: exit_status = packet_get_int();
1.93 markus 1101: packet_check_eom();
1.15 markus 1102: /* Acknowledge the exit. */
1103: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1104: packet_send();
1105: /*
1106: * Must wait for packet to be sent since we are
1107: * exiting the loop.
1108: */
1109: packet_write_wait();
1110: /* Flag that we want to exit. */
1111: quit_pending = 1;
1112: }
1113:
1.77 itojun 1114: static Channel *
1.40 markus 1115: client_request_forwarded_tcpip(const char *request_type, int rchan)
1116: {
1117: Channel* c = NULL;
1118: char *listen_address, *originator_address;
1119: int listen_port, originator_port;
1.67 markus 1120: int sock;
1.40 markus 1121:
1122: /* Get rest of the packet */
1123: listen_address = packet_get_string(NULL);
1124: listen_port = packet_get_int();
1125: originator_address = packet_get_string(NULL);
1126: originator_port = packet_get_int();
1.93 markus 1127: packet_check_eom();
1.40 markus 1128:
1129: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1130: listen_address, listen_port, originator_address, originator_port);
1131:
1.80 stevesk 1132: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1133: if (sock < 0) {
1134: xfree(originator_address);
1135: xfree(listen_address);
1136: return NULL;
1137: }
1138: c = channel_new("forwarded-tcpip",
1139: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1140: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1141: xstrdup(originator_address), 1);
1.40 markus 1142: xfree(originator_address);
1143: xfree(listen_address);
1144: return c;
1145: }
1146:
1.77 itojun 1147: static Channel*
1.40 markus 1148: client_request_x11(const char *request_type, int rchan)
1149: {
1150: Channel *c = NULL;
1151: char *originator;
1152: int originator_port;
1.67 markus 1153: int sock;
1.40 markus 1154:
1155: if (!options.forward_x11) {
1156: error("Warning: ssh server tried X11 forwarding.");
1157: error("Warning: this is probably a break in attempt by a malicious server.");
1158: return NULL;
1159: }
1160: originator = packet_get_string(NULL);
1161: if (datafellows & SSH_BUG_X11FWD) {
1162: debug2("buggy server: x11 request w/o originator_port");
1163: originator_port = 0;
1164: } else {
1165: originator_port = packet_get_int();
1166: }
1.93 markus 1167: packet_check_eom();
1.40 markus 1168: /* XXX check permission */
1.47 markus 1169: debug("client_request_x11: request from %s %d", originator,
1170: originator_port);
1.67 markus 1171: xfree(originator);
1.40 markus 1172: sock = x11_connect_display();
1.67 markus 1173: if (sock < 0)
1174: return NULL;
1175: c = channel_new("x11",
1176: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1177: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
1178: xstrdup("x11"), 1);
1.82 markus 1179: c->force_drain = 1;
1.40 markus 1180: return c;
1181: }
1182:
1.77 itojun 1183: static Channel*
1.40 markus 1184: client_request_agent(const char *request_type, int rchan)
1185: {
1186: Channel *c = NULL;
1.67 markus 1187: int sock;
1.40 markus 1188:
1189: if (!options.forward_agent) {
1190: error("Warning: ssh server tried agent forwarding.");
1191: error("Warning: this is probably a break in attempt by a malicious server.");
1192: return NULL;
1193: }
1194: sock = ssh_get_authentication_socket();
1.67 markus 1195: if (sock < 0)
1196: return NULL;
1197: c = channel_new("authentication agent connection",
1198: SSH_CHANNEL_OPEN, sock, sock, -1,
1199: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1200: xstrdup("authentication agent connection"), 1);
1.82 markus 1201: c->force_drain = 1;
1.40 markus 1202: return c;
1203: }
1204:
1.22 markus 1205: /* XXXX move to generic input handler */
1.77 itojun 1206: static void
1.94 markus 1207: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1208: {
1209: Channel *c = NULL;
1210: char *ctype;
1211: int rchan;
1.102 ! markus 1212: u_int rmaxpack, rwindow, len;
1.22 markus 1213:
1214: ctype = packet_get_string(&len);
1215: rchan = packet_get_int();
1216: rwindow = packet_get_int();
1217: rmaxpack = packet_get_int();
1218:
1.24 markus 1219: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1220: ctype, rchan, rwindow, rmaxpack);
1221:
1.40 markus 1222: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1223: c = client_request_forwarded_tcpip(ctype, rchan);
1224: } else if (strcmp(ctype, "x11") == 0) {
1225: c = client_request_x11(ctype, rchan);
1226: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1227: c = client_request_agent(ctype, rchan);
1.22 markus 1228: }
1229: /* XXX duplicate : */
1230: if (c != NULL) {
1231: debug("confirm %s", ctype);
1232: c->remote_id = rchan;
1233: c->remote_window = rwindow;
1234: c->remote_maxpacket = rmaxpack;
1.69 markus 1235: if (c->type != SSH_CHANNEL_CONNECTING) {
1236: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1237: packet_put_int(c->remote_id);
1238: packet_put_int(c->self);
1239: packet_put_int(c->local_window);
1240: packet_put_int(c->local_maxpacket);
1241: packet_send();
1242: }
1.22 markus 1243: } else {
1244: debug("failure %s", ctype);
1245: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1246: packet_put_int(rchan);
1247: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1248: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1249: packet_put_cstring("open failed");
1.66 markus 1250: packet_put_cstring("");
1251: }
1.22 markus 1252: packet_send();
1253: }
1254: xfree(ctype);
1255: }
1.77 itojun 1256: static void
1.94 markus 1257: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1258: {
1259: Channel *c = NULL;
1260: int id, reply, success = 0;
1261: char *rtype;
1262:
1263: id = packet_get_int();
1264: rtype = packet_get_string(NULL);
1265: reply = packet_get_char();
1266:
1267: debug("client_input_channel_req: channel %d rtype %s reply %d",
1268: id, rtype, reply);
1269:
1270: if (session_ident == -1) {
1271: error("client_input_channel_req: no channel %d", session_ident);
1272: } else if (id != session_ident) {
1273: error("client_input_channel_req: channel %d: wrong channel: %d",
1274: session_ident, id);
1275: }
1276: c = channel_lookup(id);
1277: if (c == NULL) {
1278: error("client_input_channel_req: channel %d: unknown channel", id);
1279: } else if (strcmp(rtype, "exit-status") == 0) {
1280: success = 1;
1281: exit_status = packet_get_int();
1.93 markus 1282: packet_check_eom();
1.48 markus 1283: }
1284: if (reply) {
1285: packet_start(success ?
1286: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1287: packet_put_int(c->remote_id);
1288: packet_send();
1289: }
1290: xfree(rtype);
1291: }
1.95 markus 1292: static void
1293: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1294: {
1295: char *rtype;
1296: int want_reply;
1297: int success = 0;
1298:
1299: rtype = packet_get_string(NULL);
1300: want_reply = packet_get_char();
1301: debug("client_input_global_request: rtype %s want_reply %d", rtype, want_reply);
1302: if (want_reply) {
1303: packet_start(success ?
1304: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1305: packet_send();
1306: packet_write_wait();
1307: }
1308: xfree(rtype);
1309: }
1.22 markus 1310:
1.77 itojun 1311: static void
1.49 itojun 1312: client_init_dispatch_20(void)
1.16 markus 1313: {
1.55 markus 1314: dispatch_init(&dispatch_protocol_error);
1.100 markus 1315:
1.16 markus 1316: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1317: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1318: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1319: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1320: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1321: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1322: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1323: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1324: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1325: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1326:
1327: /* rekeying */
1328: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1329:
1330: /* global request reply messages */
1331: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1332: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1333: }
1.77 itojun 1334: static void
1.49 itojun 1335: client_init_dispatch_13(void)
1.15 markus 1336: {
1337: dispatch_init(NULL);
1338: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1339: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1340: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1341: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1342: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1343: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1344: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1345: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1346: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1347:
1348: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1349: &auth_input_open_request : &deny_input_open);
1350: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1351: &x11_input_open : &deny_input_open);
1.15 markus 1352: }
1.77 itojun 1353: static void
1.49 itojun 1354: client_init_dispatch_15(void)
1.15 markus 1355: {
1356: client_init_dispatch_13();
1357: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1358: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1359: }
1.79 stevesk 1360: static void
1.49 itojun 1361: client_init_dispatch(void)
1.15 markus 1362: {
1.16 markus 1363: if (compat20)
1364: client_init_dispatch_20();
1365: else if (compat13)
1.15 markus 1366: client_init_dispatch_13();
1367: else
1368: client_init_dispatch_15();
1.1 deraadt 1369: }
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