Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.137
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"
1.137 ! djm 62: RCSID("$OpenBSD: clientloop.c,v 1.136 2005/03/10 22:01:05 deraadt 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"
1.118 deraadt 82: #include "sshpty.h"
1.63 markus 83: #include "misc.h"
1.123 djm 84: #include "monitor_fdpass.h"
85: #include "match.h"
86: #include "msg.h"
1.39 markus 87:
88: /* import options */
89: extern Options options;
90:
1.1 deraadt 91: /* Flag indicating that stdin should be redirected from /dev/null. */
92: extern int stdin_null_flag;
93:
1.116 dtucker 94: /* Flag indicating that no shell has been requested */
95: extern int no_shell_flag;
96:
1.123 djm 97: /* Control socket */
98: extern int control_fd;
99:
1.13 markus 100: /*
101: * Name of the host we are connecting to. This is the name given on the
102: * command line, or the HostName specified for the user-supplied name in a
103: * configuration file.
104: */
1.1 deraadt 105: extern char *host;
106:
1.13 markus 107: /*
108: * Flag to indicate that we have received a window change signal which has
109: * not yet been processed. This will cause a message indicating the new
110: * window size to be sent to the server a little later. This is volatile
111: * because this is updated in a signal handler.
112: */
1.88 markus 113: static volatile sig_atomic_t received_window_change_signal = 0;
114: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 115:
116: /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
117: static int in_non_blocking_mode = 0;
118:
119: /* Common data for the client loop code. */
1.31 markus 120: static int quit_pending; /* Set to non-zero to quit the client loop. */
121: static int escape_char; /* Escape character. */
1.11 markus 122: static int escape_pending; /* Last character was the escape character */
123: static int last_was_cr; /* Last character was a newline. */
124: static int exit_status; /* Used to store the exit status of the command. */
125: static int stdin_eof; /* EOF has been encountered on standard error. */
126: static Buffer stdin_buffer; /* Buffer for stdin data. */
127: static Buffer stdout_buffer; /* Buffer for stdout data. */
128: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 129: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
130: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 131: static int connection_in; /* Connection to server (input). */
132: static int connection_out; /* Connection to server (output). */
1.56 markus 133: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 134: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 135: static int server_alive_timeouts = 0;
1.1 deraadt 136:
1.77 itojun 137: static void client_init_dispatch(void);
1.16 markus 138: int session_ident = -1;
139:
1.123 djm 140: struct confirm_ctx {
141: int want_tty;
142: int want_subsys;
143: Buffer cmd;
144: char *term;
145: struct termios tio;
1.126 djm 146: char **env;
1.123 djm 147: };
148:
1.54 markus 149: /*XXX*/
150: extern Kex *xxx_kex;
151:
1.123 djm 152: void ssh_process_session2_setup(int, int, int, Buffer *);
153:
1.1 deraadt 154: /* Restores stdin to blocking mode. */
155:
1.77 itojun 156: static void
1.49 itojun 157: leave_non_blocking(void)
1.1 deraadt 158: {
1.11 markus 159: if (in_non_blocking_mode) {
1.125 djm 160: unset_nonblock(fileno(stdin));
1.11 markus 161: in_non_blocking_mode = 0;
162: }
1.1 deraadt 163: }
164:
1.11 markus 165: /* Puts stdin terminal in non-blocking mode. */
166:
1.77 itojun 167: static void
1.49 itojun 168: enter_non_blocking(void)
1.1 deraadt 169: {
1.11 markus 170: in_non_blocking_mode = 1;
1.124 djm 171: set_nonblock(fileno(stdin));
1.1 deraadt 172: }
173:
1.13 markus 174: /*
175: * Signal handler for the window change signal (SIGWINCH). This just sets a
176: * flag indicating that the window has changed.
177: */
1.1 deraadt 178:
1.77 itojun 179: static void
1.11 markus 180: window_change_handler(int sig)
1.1 deraadt 181: {
1.11 markus 182: received_window_change_signal = 1;
183: signal(SIGWINCH, window_change_handler);
1.1 deraadt 184: }
185:
1.13 markus 186: /*
187: * Signal handler for signals that cause the program to terminate. These
188: * signals must be trapped to restore terminal modes.
189: */
1.1 deraadt 190:
1.77 itojun 191: static void
1.11 markus 192: signal_handler(int sig)
1.1 deraadt 193: {
1.75 markus 194: received_signal = sig;
195: quit_pending = 1;
1.1 deraadt 196: }
197:
1.13 markus 198: /*
199: * Returns current time in seconds from Jan 1, 1970 with the maximum
200: * available resolution.
201: */
1.1 deraadt 202:
1.77 itojun 203: static double
1.49 itojun 204: get_current_time(void)
1.1 deraadt 205: {
1.11 markus 206: struct timeval tv;
207: gettimeofday(&tv, NULL);
208: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.1 deraadt 209: }
210:
1.13 markus 211: /*
212: * This is called when the interactive is entered. This checks if there is
213: * an EOF coming on stdin. We must check this explicitly, as select() does
214: * not appear to wake up when redirecting from /dev/null.
215: */
1.1 deraadt 216:
1.77 itojun 217: static void
1.49 itojun 218: client_check_initial_eof_on_stdin(void)
1.1 deraadt 219: {
1.11 markus 220: int len;
221: char buf[1];
1.1 deraadt 222:
1.13 markus 223: /*
224: * If standard input is to be "redirected from /dev/null", we simply
225: * mark that we have seen an EOF and send an EOF message to the
226: * server. Otherwise, we try to read a single character; it appears
227: * that for some files, such /dev/null, select() never wakes up for
228: * read for this descriptor, which means that we never get EOF. This
229: * way we will get the EOF if stdin comes from /dev/null or similar.
230: */
1.11 markus 231: if (stdin_null_flag) {
232: /* Fake EOF on stdin. */
233: debug("Sending eof.");
234: stdin_eof = 1;
235: packet_start(SSH_CMSG_EOF);
236: packet_send();
237: } else {
238: enter_non_blocking();
239:
240: /* Check for immediate EOF on stdin. */
241: len = read(fileno(stdin), buf, 1);
242: if (len == 0) {
1.13 markus 243: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 244: debug("Sending eof.");
245: stdin_eof = 1;
246: packet_start(SSH_CMSG_EOF);
247: packet_send();
248: } else if (len > 0) {
1.13 markus 249: /*
250: * Got data. We must store the data in the buffer,
251: * and also process it as an escape character if
252: * appropriate.
253: */
1.42 markus 254: if ((u_char) buf[0] == escape_char)
1.11 markus 255: escape_pending = 1;
1.52 markus 256: else
1.11 markus 257: buffer_append(&stdin_buffer, buf, 1);
258: }
259: leave_non_blocking();
260: }
1.1 deraadt 261: }
262:
263:
1.13 markus 264: /*
265: * Make packets from buffered stdin data, and buffer them for sending to the
266: * connection.
267: */
1.1 deraadt 268:
1.77 itojun 269: static void
1.49 itojun 270: client_make_packets_from_stdin_data(void)
1.1 deraadt 271: {
1.42 markus 272: u_int len;
1.1 deraadt 273:
1.11 markus 274: /* Send buffered stdin data to the server. */
275: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 276: packet_not_very_much_data_to_write()) {
1.11 markus 277: len = buffer_len(&stdin_buffer);
278: /* Keep the packets at reasonable size. */
279: if (len > packet_get_maxsize())
280: len = packet_get_maxsize();
281: packet_start(SSH_CMSG_STDIN_DATA);
282: packet_put_string(buffer_ptr(&stdin_buffer), len);
283: packet_send();
284: buffer_consume(&stdin_buffer, len);
1.52 markus 285: stdin_bytes += len;
1.11 markus 286: /* If we have a pending EOF, send it now. */
287: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
288: packet_start(SSH_CMSG_EOF);
289: packet_send();
290: }
1.1 deraadt 291: }
292: }
293:
1.13 markus 294: /*
295: * Checks if the client window has changed, and sends a packet about it to
296: * the server if so. The actual change is detected elsewhere (by a software
297: * interrupt on Unix); this just checks the flag and sends a message if
298: * appropriate.
299: */
1.1 deraadt 300:
1.77 itojun 301: static void
1.49 itojun 302: client_check_window_change(void)
1.1 deraadt 303: {
1.16 markus 304: struct winsize ws;
305:
306: if (! received_window_change_signal)
307: return;
308: /** XXX race */
309: received_window_change_signal = 0;
310:
1.37 markus 311: debug2("client_check_window_change: changed");
1.16 markus 312:
313: if (compat20) {
1.123 djm 314: channel_send_window_changes();
1.16 markus 315: } else {
1.123 djm 316: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
317: return;
1.16 markus 318: packet_start(SSH_CMSG_WINDOW_SIZE);
319: packet_put_int(ws.ws_row);
320: packet_put_int(ws.ws_col);
321: packet_put_int(ws.ws_xpixel);
322: packet_put_int(ws.ws_ypixel);
323: packet_send();
1.1 deraadt 324: }
325: }
326:
1.117 markus 327: static void
328: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
329: {
330: server_alive_timeouts = 0;
331: client_global_request_reply_fwd(type, seq, ctxt);
332: }
333:
334: static void
335: server_alive_check(void)
336: {
337: if (++server_alive_timeouts > options.server_alive_count_max)
338: packet_disconnect("Timeout, server not responding.");
339: packet_start(SSH2_MSG_GLOBAL_REQUEST);
340: packet_put_cstring("keepalive@openssh.com");
341: packet_put_char(1); /* boolean: want reply */
342: packet_send();
343: }
344:
1.13 markus 345: /*
346: * Waits until the client can do something (some data becomes available on
347: * one of the file descriptors).
348: */
1.77 itojun 349: static void
1.46 markus 350: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 351: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 352: {
1.117 markus 353: struct timeval tv, *tvp;
354: int ret;
355:
1.46 markus 356: /* Add any selections by the channel mechanism. */
1.81 markus 357: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 358:
1.16 markus 359: if (!compat20) {
1.17 markus 360: /* Read from the connection, unless our buffers are full. */
1.16 markus 361: if (buffer_len(&stdout_buffer) < buffer_high &&
362: buffer_len(&stderr_buffer) < buffer_high &&
363: channel_not_very_much_buffered_data())
1.46 markus 364: FD_SET(connection_in, *readsetp);
1.17 markus 365: /*
366: * Read from stdin, unless we have seen EOF or have very much
367: * buffered data to send to the server.
368: */
369: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 370: FD_SET(fileno(stdin), *readsetp);
1.17 markus 371:
372: /* Select stdout/stderr if have data in buffer. */
373: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 374: FD_SET(fileno(stdout), *writesetp);
1.17 markus 375: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 376: FD_SET(fileno(stderr), *writesetp);
1.16 markus 377: } else {
1.71 markus 378: /* channel_prepare_select could have closed the last channel */
1.84 markus 379: if (session_closed && !channel_still_open() &&
380: !packet_have_data_to_write()) {
381: /* clear mask since we did not call select() */
1.87 markus 382: memset(*readsetp, 0, *nallocp);
383: memset(*writesetp, 0, *nallocp);
1.84 markus 384: return;
1.71 markus 385: } else {
386: FD_SET(connection_in, *readsetp);
387: }
1.16 markus 388: }
1.11 markus 389:
390: /* Select server connection if have data to write to the server. */
391: if (packet_have_data_to_write())
1.46 markus 392: FD_SET(connection_out, *writesetp);
1.11 markus 393:
1.123 djm 394: if (control_fd != -1)
395: FD_SET(control_fd, *readsetp);
396:
1.13 markus 397: /*
398: * Wait for something to happen. This will suspend the process until
399: * some selected descriptor can be read, written, or has some other
1.117 markus 400: * event pending.
1.13 markus 401: */
1.11 markus 402:
1.117 markus 403: if (options.server_alive_interval == 0 || !compat20)
404: tvp = NULL;
1.129 deraadt 405: else {
1.117 markus 406: tv.tv_sec = options.server_alive_interval;
407: tv.tv_usec = 0;
408: tvp = &tv;
409: }
410: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
411: if (ret < 0) {
1.11 markus 412: char buf[100];
1.51 markus 413:
414: /*
415: * We have to clear the select masks, because we return.
416: * We have to return, because the mainloop checks for the flags
417: * set by the signal handlers.
418: */
1.87 markus 419: memset(*readsetp, 0, *nallocp);
420: memset(*writesetp, 0, *nallocp);
1.50 deraadt 421:
1.11 markus 422: if (errno == EINTR)
423: return;
424: /* Note: we might still have data in the buffers. */
425: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
426: buffer_append(&stderr_buffer, buf, strlen(buf));
427: quit_pending = 1;
1.117 markus 428: } else if (ret == 0)
429: server_alive_check();
1.11 markus 430: }
431:
1.77 itojun 432: static void
1.31 markus 433: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 434: {
1.11 markus 435: /* Flush stdout and stderr buffers. */
1.31 markus 436: if (buffer_len(bout) > 0)
1.112 deraadt 437: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 438: if (buffer_len(berr) > 0)
1.112 deraadt 439: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 440:
441: leave_raw_mode();
442:
1.13 markus 443: /*
444: * Free (and clear) the buffer to reduce the amount of data that gets
445: * written to swap.
446: */
1.31 markus 447: buffer_free(bin);
448: buffer_free(bout);
449: buffer_free(berr);
1.11 markus 450:
451: /* Send the suspend signal to the program itself. */
452: kill(getpid(), SIGTSTP);
453:
1.132 djm 454: /* Reset window sizes in case they have changed */
455: received_window_change_signal = 1;
1.11 markus 456:
457: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 458: buffer_init(bin);
459: buffer_init(bout);
460: buffer_init(berr);
1.11 markus 461:
462: enter_raw_mode();
463: }
464:
1.77 itojun 465: static void
1.17 markus 466: client_process_net_input(fd_set * readset)
1.11 markus 467: {
1.17 markus 468: int len;
469: char buf[8192];
1.11 markus 470:
1.13 markus 471: /*
472: * Read input from the server, and add any such data to the buffer of
473: * the packet subsystem.
474: */
1.11 markus 475: if (FD_ISSET(connection_in, readset)) {
476: /* Read as much as possible. */
477: len = read(connection_in, buf, sizeof(buf));
478: if (len == 0) {
479: /* Received EOF. The remote host has closed the connection. */
480: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
481: host);
1.1 deraadt 482: buffer_append(&stderr_buffer, buf, strlen(buf));
483: quit_pending = 1;
484: return;
1.11 markus 485: }
1.13 markus 486: /*
487: * There is a kernel bug on Solaris that causes select to
488: * sometimes wake up even though there is no data available.
489: */
1.53 millert 490: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 491: len = 0;
492:
493: if (len < 0) {
494: /* An error has encountered. Perhaps there is a network problem. */
495: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
496: host, strerror(errno));
497: buffer_append(&stderr_buffer, buf, strlen(buf));
498: quit_pending = 1;
499: return;
500: }
501: packet_process_incoming(buf, len);
502: }
1.17 markus 503: }
1.16 markus 504:
1.97 jakob 505: static void
1.123 djm 506: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
507: {
508: int id;
509: Channel *c;
1.129 deraadt 510:
1.123 djm 511: id = packet_get_int();
512: packet_check_eom();
513:
514: if ((c = channel_lookup(id)) == NULL) {
515: error("%s: no channel for id %d", __func__, id);
516: return;
517: }
518:
519: if (type == SSH2_MSG_CHANNEL_SUCCESS)
520: debug2("Request suceeded on channel %d", id);
521: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
522: error("Request failed on channel %d", id);
523: channel_free(c);
524: }
525: }
526:
527: static void
528: client_extra_session2_setup(int id, void *arg)
529: {
530: struct confirm_ctx *cctx = arg;
531: Channel *c;
1.126 djm 532: int i;
1.129 deraadt 533:
1.123 djm 534: if (cctx == NULL)
535: fatal("%s: cctx == NULL", __func__);
536: if ((c = channel_lookup(id)) == NULL)
537: fatal("%s: no channel for id %d", __func__, id);
538:
1.129 deraadt 539: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 540: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 541: client_subsystem_reply);
1.127 djm 542:
1.123 djm 543: c->confirm_ctx = NULL;
544: buffer_free(&cctx->cmd);
1.126 djm 545: xfree(cctx->term);
546: if (cctx->env != NULL) {
547: for (i = 0; cctx->env[i] != NULL; i++)
548: xfree(cctx->env[i]);
549: xfree(cctx->env);
1.129 deraadt 550: }
1.126 djm 551: xfree(cctx);
1.123 djm 552: }
553:
554: static void
555: client_process_control(fd_set * readset)
556: {
557: Buffer m;
558: Channel *c;
1.127 djm 559: int client_fd, new_fd[3], ver, i, allowed;
1.123 djm 560: socklen_t addrlen;
561: struct sockaddr_storage addr;
562: struct confirm_ctx *cctx;
563: char *cmd;
1.134 djm 564: u_int len, env_len, command, flags;
1.123 djm 565: uid_t euid;
566: gid_t egid;
567:
568: /*
569: * Accept connection on control socket
570: */
571: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
572: return;
573:
574: memset(&addr, 0, sizeof(addr));
575: addrlen = sizeof(addr);
576: if ((client_fd = accept(control_fd,
577: (struct sockaddr*)&addr, &addrlen)) == -1) {
578: error("%s accept: %s", __func__, strerror(errno));
579: return;
580: }
581:
582: if (getpeereid(client_fd, &euid, &egid) < 0) {
583: error("%s getpeereid failed: %s", __func__, strerror(errno));
584: close(client_fd);
585: return;
586: }
587: if ((euid != 0) && (getuid() != euid)) {
588: error("control mode uid mismatch: peer euid %u != uid %u",
589: (u_int) euid, (u_int) getuid());
590: close(client_fd);
591: return;
592: }
1.127 djm 593:
1.134 djm 594: unset_nonblock(client_fd);
595:
596: /* Read command */
597: buffer_init(&m);
598: if (ssh_msg_recv(client_fd, &m) == -1) {
599: error("%s: client msg_recv failed", __func__);
600: close(client_fd);
601: buffer_free(&m);
602: return;
603: }
604: if ((ver = buffer_get_char(&m)) != 1) {
605: error("%s: wrong client version %d", __func__, ver);
606: buffer_free(&m);
607: close(client_fd);
608: return;
609: }
610:
1.127 djm 611: allowed = 1;
1.134 djm 612: command = buffer_get_int(&m);
613: flags = buffer_get_int(&m);
1.123 djm 614:
1.134 djm 615: buffer_clear(&m);
1.123 djm 616:
1.134 djm 617: switch (command) {
618: case SSHMUX_COMMAND_OPEN:
1.137 ! djm 619: if (options.control_master == SSHCTL_MASTER_ASK ||
! 620: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 621: allowed = ask_permission("Allow shared connection "
622: "to %s? ", host);
623: /* continue below */
624: break;
625: case SSHMUX_COMMAND_TERMINATE:
1.137 ! djm 626: if (options.control_master == SSHCTL_MASTER_ASK ||
! 627: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 628: allowed = ask_permission("Terminate shared connection "
629: "to %s? ", host);
630: if (allowed)
631: quit_pending = 1;
1.136 deraadt 632: /* FALLTHROUGH */
1.134 djm 633: case SSHMUX_COMMAND_ALIVE_CHECK:
634: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
635: buffer_clear(&m);
636: buffer_put_int(&m, allowed);
637: buffer_put_int(&m, getpid());
638: if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
639: error("%s: client msg_send failed", __func__);
640: close(client_fd);
641: buffer_free(&m);
642: return;
643: }
644: buffer_free(&m);
645: close(client_fd);
646: return;
647: default:
648: error("Unsupported command %d", command);
649: buffer_free(&m);
650: close(client_fd);
651: return;
652: }
1.123 djm 653:
1.134 djm 654: /* Reply for SSHMUX_COMMAND_OPEN */
655: buffer_clear(&m);
1.127 djm 656: buffer_put_int(&m, allowed);
1.123 djm 657: buffer_put_int(&m, getpid());
1.134 djm 658: if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
1.123 djm 659: error("%s: client msg_send failed", __func__);
660: close(client_fd);
1.127 djm 661: buffer_free(&m);
1.123 djm 662: return;
663: }
664:
1.127 djm 665: if (!allowed) {
666: error("Refused control connection");
667: close(client_fd);
668: buffer_free(&m);
669: return;
670: }
671:
1.134 djm 672: buffer_clear(&m);
1.123 djm 673: if (ssh_msg_recv(client_fd, &m) == -1) {
674: error("%s: client msg_recv failed", __func__);
675: close(client_fd);
1.127 djm 676: buffer_free(&m);
1.123 djm 677: return;
678: }
1.134 djm 679: if ((ver = buffer_get_char(&m)) != 1) {
1.123 djm 680: error("%s: wrong client version %d", __func__, ver);
681: buffer_free(&m);
682: close(client_fd);
683: return;
684: }
685:
686: cctx = xmalloc(sizeof(*cctx));
687: memset(cctx, 0, sizeof(*cctx));
1.134 djm 688: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
689: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.123 djm 690: cctx->term = buffer_get_string(&m, &len);
691:
692: cmd = buffer_get_string(&m, &len);
693: buffer_init(&cctx->cmd);
694: buffer_append(&cctx->cmd, cmd, strlen(cmd));
695:
1.126 djm 696: env_len = buffer_get_int(&m);
697: env_len = MIN(env_len, 4096);
698: debug3("%s: receiving %d env vars", __func__, env_len);
699: if (env_len != 0) {
700: cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
701: for (i = 0; i < env_len; i++)
702: cctx->env[i] = buffer_get_string(&m, &len);
703: cctx->env[i] = NULL;
704: }
705:
1.123 djm 706: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
707: cctx->want_tty, cctx->want_subsys, cmd);
708:
709: /* Gather fds from client */
710: new_fd[0] = mm_receive_fd(client_fd);
711: new_fd[1] = mm_receive_fd(client_fd);
712: new_fd[2] = mm_receive_fd(client_fd);
713:
714: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
715: new_fd[0], new_fd[1], new_fd[2]);
716:
717: /* Try to pick up ttymodes from client before it goes raw */
718: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
719: error("%s: tcgetattr: %s", __func__, strerror(errno));
720:
1.134 djm 721: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 722: buffer_clear(&m);
1.134 djm 723: if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
1.123 djm 724: error("%s: client msg_send failed", __func__);
725: close(client_fd);
726: close(new_fd[0]);
727: close(new_fd[1]);
728: close(new_fd[2]);
1.127 djm 729: buffer_free(&m);
1.134 djm 730: xfree(cctx->term);
731: if (env_len != 0) {
732: for (i = 0; i < env_len; i++)
733: xfree(cctx->env[i]);
734: xfree(cctx->env);
735: }
1.123 djm 736: return;
737: }
738: buffer_free(&m);
739:
740: /* enable nonblocking unless tty */
741: if (!isatty(new_fd[0]))
742: set_nonblock(new_fd[0]);
743: if (!isatty(new_fd[1]))
744: set_nonblock(new_fd[1]);
745: if (!isatty(new_fd[2]))
746: set_nonblock(new_fd[2]);
747:
748: set_nonblock(client_fd);
749:
1.129 deraadt 750: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 751: new_fd[0], new_fd[1], new_fd[2],
752: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
753: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
754:
755: /* XXX */
756: c->ctl_fd = client_fd;
757:
758: debug3("%s: channel_new: %d", __func__, c->self);
759:
760: channel_send_open(c->self);
761: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
762: }
763:
764: static void
1.99 markus 765: process_cmdline(void)
1.97 jakob 766: {
767: void (*handler)(int);
1.135 djm 768: char *s, *cmd, *cancel_host;
1.121 djm 769: int delete = 0;
1.97 jakob 770: int local = 0;
1.135 djm 771: u_short cancel_port;
772: Forward fwd;
1.97 jakob 773:
774: leave_raw_mode();
1.101 markus 775: handler = signal(SIGINT, SIG_IGN);
1.99 markus 776: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 777: if (s == NULL)
778: goto out;
779: while (*s && isspace(*s))
780: s++;
1.121 djm 781: if (*s == '-')
782: s++; /* Skip cmdline '-', if any */
1.120 dtucker 783: if (*s == '\0')
1.97 jakob 784: goto out;
1.121 djm 785:
1.122 djm 786: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 787: logit("Commands:");
788: logit(" -Lport:host:hostport Request local forward");
789: logit(" -Rport:host:hostport Request remote forward");
790: logit(" -KRhostport Cancel remote forward");
791: goto out;
792: }
793:
794: if (*s == 'K') {
795: delete = 1;
796: s++;
797: }
798: if (*s != 'L' && *s != 'R') {
1.109 itojun 799: logit("Invalid command.");
1.97 jakob 800: goto out;
801: }
1.121 djm 802: if (*s == 'L')
1.97 jakob 803: local = 1;
1.121 djm 804: if (local && delete) {
805: logit("Not supported.");
806: goto out;
807: }
808: if ((!local || delete) && !compat20) {
1.109 itojun 809: logit("Not supported for SSH protocol version 1.");
1.97 jakob 810: goto out;
811: }
1.121 djm 812:
813: s++;
1.97 jakob 814: while (*s && isspace(*s))
815: s++;
816:
1.121 djm 817: if (delete) {
1.135 djm 818: cancel_port = 0;
819: cancel_host = hpdelim(&s); /* may be NULL */
820: if (s != NULL) {
821: cancel_port = a2port(s);
822: cancel_host = cleanhostname(cancel_host);
823: } else {
824: cancel_port = a2port(cancel_host);
825: cancel_host = NULL;
1.121 djm 826: }
1.135 djm 827: if (cancel_port == 0) {
828: logit("Bad forwarding close port");
1.121 djm 829: goto out;
830: }
1.135 djm 831: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 832: } else {
1.135 djm 833: if (!parse_forward(&fwd, s)) {
1.121 djm 834: logit("Bad forwarding specification.");
835: goto out;
836: }
837: if (local) {
1.135 djm 838: if (channel_setup_local_fwd_listener(fwd.listen_host,
839: fwd.listen_port, fwd.connect_host,
840: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 841: logit("Port forwarding failed.");
842: goto out;
843: }
1.135 djm 844: } else {
845: channel_request_remote_forwarding(fwd.listen_host,
846: fwd.listen_port, fwd.connect_host,
847: fwd.connect_port);
848: }
849:
1.121 djm 850: logit("Forwarding port.");
851: }
852:
1.97 jakob 853: out:
854: signal(SIGINT, handler);
855: enter_raw_mode();
856: if (cmd)
857: xfree(cmd);
858: }
859:
1.31 markus 860: /* process the characters one by one */
1.77 itojun 861: static int
1.31 markus 862: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
863: {
1.32 markus 864: char string[1024];
1.31 markus 865: pid_t pid;
866: int bytes = 0;
1.42 markus 867: u_int i;
868: u_char ch;
1.31 markus 869: char *s;
870:
871: for (i = 0; i < len; i++) {
872: /* Get one character at a time. */
873: ch = buf[i];
874:
875: if (escape_pending) {
876: /* We have previously seen an escape character. */
877: /* Clear the flag now. */
878: escape_pending = 0;
879:
880: /* Process the escaped character. */
881: switch (ch) {
882: case '.':
883: /* Terminate the connection. */
1.32 markus 884: snprintf(string, sizeof string, "%c.\r\n", escape_char);
885: buffer_append(berr, string, strlen(string));
1.31 markus 886:
887: quit_pending = 1;
888: return -1;
889:
890: case 'Z' - 64:
891: /* Suspend the program. */
892: /* Print a message to that effect to the user. */
1.32 markus 893: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
894: buffer_append(berr, string, strlen(string));
1.31 markus 895:
896: /* Restore terminal modes and suspend. */
897: client_suspend_self(bin, bout, berr);
898:
899: /* We have been continued. */
900: continue;
901:
1.111 markus 902: case 'B':
903: if (compat20) {
904: snprintf(string, sizeof string,
905: "%cB\r\n", escape_char);
906: buffer_append(berr, string,
907: strlen(string));
908: channel_request_start(session_ident,
909: "break", 0);
910: packet_put_int(1000);
911: packet_send();
912: }
913: continue;
914:
1.54 markus 915: case 'R':
1.59 markus 916: if (compat20) {
917: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 918: logit("Server does not support re-keying");
1.59 markus 919: else
920: need_rekeying = 1;
921: }
1.54 markus 922: continue;
923:
1.31 markus 924: case '&':
925: /*
926: * Detach the program (continue to serve connections,
927: * but put in background and no more new connections).
928: */
929: /* Restore tty modes. */
930: leave_raw_mode();
931:
932: /* Stop listening for new connections. */
1.86 markus 933: channel_stop_listening();
1.31 markus 934:
1.86 markus 935: snprintf(string, sizeof string,
936: "%c& [backgrounded]\n", escape_char);
937: buffer_append(berr, string, strlen(string));
1.31 markus 938:
939: /* Fork into background. */
940: pid = fork();
941: if (pid < 0) {
942: error("fork: %.100s", strerror(errno));
943: continue;
944: }
945: if (pid != 0) { /* This is the parent. */
946: /* The parent just exits. */
947: exit(0);
948: }
949: /* The child continues serving connections. */
1.86 markus 950: if (compat20) {
951: buffer_append(bin, "\004", 1);
952: /* fake EOF on stdin */
953: return -1;
954: } else if (!stdin_eof) {
955: /*
956: * Sending SSH_CMSG_EOF alone does not always appear
957: * to be enough. So we try to send an EOF character
958: * first.
959: */
960: packet_start(SSH_CMSG_STDIN_DATA);
961: packet_put_string("\004", 1);
962: packet_send();
963: /* Close stdin. */
964: stdin_eof = 1;
965: if (buffer_len(bin) == 0) {
966: packet_start(SSH_CMSG_EOF);
967: packet_send();
968: }
969: }
970: continue;
1.31 markus 971:
972: case '?':
1.32 markus 973: snprintf(string, sizeof string,
1.31 markus 974: "%c?\r\n\
975: Supported escape sequences:\r\n\
1.104 stevesk 976: %c. - terminate connection\r\n\
1.111 markus 977: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 978: %cC - open a command line\r\n\
979: %cR - Request rekey (SSH protocol 2 only)\r\n\
980: %c^Z - suspend ssh\r\n\
981: %c# - list forwarded connections\r\n\
982: %c& - background ssh (when waiting for connections to terminate)\r\n\
983: %c? - this message\r\n\
984: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 985: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 986: escape_char, escape_char, escape_char, escape_char,
987: escape_char, escape_char, escape_char, escape_char,
1.111 markus 988: escape_char, escape_char, escape_char);
1.32 markus 989: buffer_append(berr, string, strlen(string));
1.31 markus 990: continue;
991:
992: case '#':
1.32 markus 993: snprintf(string, sizeof string, "%c#\r\n", escape_char);
994: buffer_append(berr, string, strlen(string));
1.31 markus 995: s = channel_open_message();
996: buffer_append(berr, s, strlen(s));
997: xfree(s);
1.97 jakob 998: continue;
999:
1000: case 'C':
1.99 markus 1001: process_cmdline();
1.31 markus 1002: continue;
1003:
1004: default:
1005: if (ch != escape_char) {
1006: buffer_put_char(bin, escape_char);
1007: bytes++;
1008: }
1009: /* Escaped characters fall through here */
1010: break;
1011: }
1012: } else {
1013: /*
1014: * The previous character was not an escape char. Check if this
1015: * is an escape.
1016: */
1017: if (last_was_cr && ch == escape_char) {
1018: /* It is. Set the flag and continue to next character. */
1019: escape_pending = 1;
1020: continue;
1021: }
1022: }
1023:
1024: /*
1025: * Normal character. Record whether it was a newline,
1026: * and append it to the buffer.
1027: */
1028: last_was_cr = (ch == '\r' || ch == '\n');
1029: buffer_put_char(bin, ch);
1030: bytes++;
1031: }
1032: return bytes;
1033: }
1034:
1.77 itojun 1035: static void
1.17 markus 1036: client_process_input(fd_set * readset)
1037: {
1.21 deraadt 1038: int len;
1.31 markus 1039: char buf[8192];
1.16 markus 1040:
1.11 markus 1041: /* Read input from stdin. */
1042: if (FD_ISSET(fileno(stdin), readset)) {
1043: /* Read as much as possible. */
1044: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1045: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1046: return; /* we'll try again later */
1.11 markus 1047: if (len <= 0) {
1.13 markus 1048: /*
1049: * Received EOF or error. They are treated
1050: * similarly, except that an error message is printed
1051: * if it was an error condition.
1052: */
1.11 markus 1053: if (len < 0) {
1054: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1055: buffer_append(&stderr_buffer, buf, strlen(buf));
1056: }
1057: /* Mark that we have seen EOF. */
1058: stdin_eof = 1;
1.13 markus 1059: /*
1060: * Send an EOF message to the server unless there is
1061: * data in the buffer. If there is data in the
1062: * buffer, no message will be sent now. Code
1063: * elsewhere will send the EOF when the buffer
1064: * becomes empty if stdin_eof is set.
1065: */
1.11 markus 1066: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1067: packet_start(SSH_CMSG_EOF);
1068: packet_send();
1.11 markus 1069: }
1.72 stevesk 1070: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1071: /*
1072: * Normal successful read, and no escape character.
1073: * Just append the data to buffer.
1074: */
1.11 markus 1075: buffer_append(&stdin_buffer, buf, len);
1076: } else {
1.13 markus 1077: /*
1078: * Normal, successful read. But we have an escape character
1079: * and have to process the characters one by one.
1080: */
1.52 markus 1081: if (process_escapes(&stdin_buffer, &stdout_buffer,
1082: &stderr_buffer, buf, len) == -1)
1.31 markus 1083: return;
1.11 markus 1084: }
1085: }
1086: }
1087:
1.77 itojun 1088: static void
1.11 markus 1089: client_process_output(fd_set * writeset)
1090: {
1091: int len;
1092: char buf[100];
1.1 deraadt 1093:
1.11 markus 1094: /* Write buffered output to stdout. */
1095: if (FD_ISSET(fileno(stdout), writeset)) {
1096: /* Write as much data as possible. */
1097: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1098: buffer_len(&stdout_buffer));
1.11 markus 1099: if (len <= 0) {
1.64 markus 1100: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1101: len = 0;
1102: else {
1.13 markus 1103: /*
1104: * An error or EOF was encountered. Put an
1105: * error message to stderr buffer.
1106: */
1.11 markus 1107: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1108: buffer_append(&stderr_buffer, buf, strlen(buf));
1109: quit_pending = 1;
1110: return;
1111: }
1112: }
1113: /* Consume printed data from the buffer. */
1114: buffer_consume(&stdout_buffer, len);
1.57 markus 1115: stdout_bytes += len;
1.11 markus 1116: }
1117: /* Write buffered output to stderr. */
1118: if (FD_ISSET(fileno(stderr), writeset)) {
1119: /* Write as much data as possible. */
1120: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1121: buffer_len(&stderr_buffer));
1.11 markus 1122: if (len <= 0) {
1.64 markus 1123: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1124: len = 0;
1125: else {
1.13 markus 1126: /* EOF or error, but can't even print error message. */
1.11 markus 1127: quit_pending = 1;
1128: return;
1129: }
1130: }
1131: /* Consume printed characters from the buffer. */
1132: buffer_consume(&stderr_buffer, len);
1.57 markus 1133: stderr_bytes += len;
1.11 markus 1134: }
1.1 deraadt 1135: }
1136:
1.13 markus 1137: /*
1.15 markus 1138: * Get packets from the connection input buffer, and process them as long as
1139: * there are packets available.
1140: *
1141: * Any unknown packets received during the actual
1142: * session cause the session to terminate. This is
1143: * intended to make debugging easier since no
1144: * confirmations are sent. Any compatible protocol
1145: * extensions must be negotiated during the
1146: * preparatory phase.
1147: */
1148:
1.77 itojun 1149: static void
1.49 itojun 1150: client_process_buffered_input_packets(void)
1.15 markus 1151: {
1.54 markus 1152: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1153: }
1154:
1.31 markus 1155: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1156:
1.77 itojun 1157: static int
1.31 markus 1158: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1159: {
1.31 markus 1160: /* XXX we assume c->extended is writeable */
1161: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1162: }
1163:
1.77 itojun 1164: static void
1.60 markus 1165: client_channel_closed(int id, void *arg)
1166: {
1.83 markus 1167: channel_cancel_cleanup(id);
1.60 markus 1168: session_closed = 1;
1.113 markus 1169: leave_raw_mode();
1.60 markus 1170: }
1171:
1.15 markus 1172: /*
1.13 markus 1173: * Implements the interactive session with the server. This is called after
1174: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1175: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1176: * used as an escape character for terminating or suspending the session.
1.13 markus 1177: */
1.1 deraadt 1178:
1.20 markus 1179: int
1.30 markus 1180: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1181: {
1.46 markus 1182: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1183: double start_time, total_time;
1.130 avsm 1184: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1185: u_int nalloc = 0;
1.11 markus 1186: char buf[100];
1187:
1188: debug("Entering interactive session.");
1189:
1190: start_time = get_current_time();
1191:
1192: /* Initialize variables. */
1193: escape_pending = 0;
1194: last_was_cr = 1;
1195: exit_status = -1;
1196: stdin_eof = 0;
1197: buffer_high = 64 * 1024;
1198: connection_in = packet_get_connection_in();
1199: connection_out = packet_get_connection_out();
1.46 markus 1200: max_fd = MAX(connection_in, connection_out);
1.123 djm 1201: if (control_fd != -1)
1202: max_fd = MAX(max_fd, control_fd);
1.46 markus 1203:
1204: if (!compat20) {
1.63 markus 1205: /* enable nonblocking unless tty */
1206: if (!isatty(fileno(stdin)))
1207: set_nonblock(fileno(stdin));
1208: if (!isatty(fileno(stdout)))
1209: set_nonblock(fileno(stdout));
1210: if (!isatty(fileno(stderr)))
1211: set_nonblock(fileno(stderr));
1.46 markus 1212: max_fd = MAX(max_fd, fileno(stdin));
1213: max_fd = MAX(max_fd, fileno(stdout));
1214: max_fd = MAX(max_fd, fileno(stderr));
1215: }
1.11 markus 1216: stdin_bytes = 0;
1217: stdout_bytes = 0;
1218: stderr_bytes = 0;
1219: quit_pending = 0;
1220: escape_char = escape_char_arg;
1221:
1222: /* Initialize buffers. */
1223: buffer_init(&stdin_buffer);
1224: buffer_init(&stdout_buffer);
1225: buffer_init(&stderr_buffer);
1226:
1.15 markus 1227: client_init_dispatch();
1228:
1.105 markus 1229: /*
1230: * Set signal handlers, (e.g. to restore non-blocking mode)
1231: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1232: */
1.131 djm 1233: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1234: signal(SIGHUP, signal_handler);
1.105 markus 1235: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1236: signal(SIGINT, signal_handler);
1237: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1238: signal(SIGQUIT, signal_handler);
1239: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1240: signal(SIGTERM, signal_handler);
1.132 djm 1241: signal(SIGWINCH, window_change_handler);
1.11 markus 1242:
1243: if (have_pty)
1244: enter_raw_mode();
1245:
1.48 markus 1246: if (compat20) {
1247: session_ident = ssh2_chan_id;
1.72 stevesk 1248: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1249: channel_register_filter(session_ident,
1250: simple_escape_filter);
1.60 markus 1251: if (session_ident != -1)
1252: channel_register_cleanup(session_ident,
1253: client_channel_closed);
1.48 markus 1254: } else {
1255: /* Check if we should immediately send eof on stdin. */
1.16 markus 1256: client_check_initial_eof_on_stdin();
1.48 markus 1257: }
1.30 markus 1258:
1.11 markus 1259: /* Main loop of the client for the interactive session mode. */
1260: while (!quit_pending) {
1261:
1.13 markus 1262: /* Process buffered packets sent by the server. */
1.11 markus 1263: client_process_buffered_input_packets();
1264:
1.60 markus 1265: if (compat20 && session_closed && !channel_still_open())
1266: break;
1267:
1.56 markus 1268: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1269:
1.56 markus 1270: if (rekeying) {
1271: debug("rekeying in progress");
1272: } else {
1273: /*
1274: * Make packets of buffered stdin data, and buffer
1275: * them for sending to the server.
1276: */
1277: if (!compat20)
1278: client_make_packets_from_stdin_data();
1.11 markus 1279:
1.56 markus 1280: /*
1281: * Make packets from buffered channel data, and
1282: * enqueue them for sending to the server.
1283: */
1284: if (packet_not_very_much_data_to_write())
1285: channel_output_poll();
1.11 markus 1286:
1.56 markus 1287: /*
1288: * Check if the window size has changed, and buffer a
1289: * message about it to the server if so.
1290: */
1291: client_check_window_change();
1.11 markus 1292:
1.56 markus 1293: if (quit_pending)
1294: break;
1295: }
1.13 markus 1296: /*
1297: * Wait until we have something to do (something becomes
1298: * available on one of the descriptors).
1299: */
1.81 markus 1300: max_fd2 = max_fd;
1.56 markus 1301: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1302: &max_fd2, &nalloc, rekeying);
1.11 markus 1303:
1304: if (quit_pending)
1305: break;
1306:
1.56 markus 1307: /* Do channel operations unless rekeying in progress. */
1308: if (!rekeying) {
1309: channel_after_select(readset, writeset);
1.108 markus 1310: if (need_rekeying || packet_need_rekeying()) {
1311: debug("need rekeying");
1.56 markus 1312: xxx_kex->done = 0;
1313: kex_send_kexinit(xxx_kex);
1314: need_rekeying = 0;
1315: }
1316: }
1.11 markus 1317:
1.17 markus 1318: /* Buffer input from the connection. */
1.46 markus 1319: client_process_net_input(readset);
1.17 markus 1320:
1.123 djm 1321: /* Accept control connections. */
1322: client_process_control(readset);
1323:
1.17 markus 1324: if (quit_pending)
1325: break;
1.11 markus 1326:
1.17 markus 1327: if (!compat20) {
1328: /* Buffer data from stdin */
1.46 markus 1329: client_process_input(readset);
1.17 markus 1330: /*
1331: * Process output to stdout and stderr. Output to
1332: * the connection is processed elsewhere (above).
1333: */
1.46 markus 1334: client_process_output(writeset);
1.17 markus 1335: }
1.11 markus 1336:
1.13 markus 1337: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1338: if (FD_ISSET(connection_out, writeset))
1.11 markus 1339: packet_write_poll();
1340: }
1.46 markus 1341: if (readset)
1342: xfree(readset);
1343: if (writeset)
1344: xfree(writeset);
1.11 markus 1345:
1346: /* Terminate the session. */
1347:
1348: /* Stop watching for window change. */
1.132 djm 1349: signal(SIGWINCH, SIG_DFL);
1.11 markus 1350:
1.76 markus 1351: channel_free_all();
1.11 markus 1352:
1.75 markus 1353: if (have_pty)
1354: leave_raw_mode();
1355:
1356: /* restore blocking io */
1357: if (!isatty(fileno(stdin)))
1358: unset_nonblock(fileno(stdin));
1359: if (!isatty(fileno(stdout)))
1360: unset_nonblock(fileno(stdout));
1361: if (!isatty(fileno(stderr)))
1362: unset_nonblock(fileno(stderr));
1.116 dtucker 1363:
1364: /*
1365: * If there was no shell or command requested, there will be no remote
1366: * exit status to be returned. In that case, clear error code if the
1367: * connection was deliberately terminated at this end.
1368: */
1369: if (no_shell_flag && received_signal == SIGTERM) {
1370: received_signal = 0;
1371: exit_status = 0;
1372: }
1.75 markus 1373:
1.113 markus 1374: if (received_signal)
1.89 itojun 1375: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1376:
1.13 markus 1377: /*
1378: * In interactive mode (with pseudo tty) display a message indicating
1379: * that the connection has been closed.
1380: */
1.11 markus 1381: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1382: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1383: buffer_append(&stderr_buffer, buf, strlen(buf));
1384: }
1.70 markus 1385:
1.11 markus 1386: /* Output any buffered data for stdout. */
1.70 markus 1387: while (buffer_len(&stdout_buffer) > 0) {
1388: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1389: buffer_len(&stdout_buffer));
1.70 markus 1390: if (len <= 0) {
1.11 markus 1391: error("Write failed flushing stdout buffer.");
1.70 markus 1392: break;
1393: }
1.11 markus 1394: buffer_consume(&stdout_buffer, len);
1.57 markus 1395: stdout_bytes += len;
1.11 markus 1396: }
1397:
1398: /* Output any buffered data for stderr. */
1.70 markus 1399: while (buffer_len(&stderr_buffer) > 0) {
1400: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1401: buffer_len(&stderr_buffer));
1.70 markus 1402: if (len <= 0) {
1.11 markus 1403: error("Write failed flushing stderr buffer.");
1.70 markus 1404: break;
1405: }
1.11 markus 1406: buffer_consume(&stderr_buffer, len);
1.57 markus 1407: stderr_bytes += len;
1.11 markus 1408: }
1409:
1410: /* Clear and free any buffers. */
1411: memset(buf, 0, sizeof(buf));
1412: buffer_free(&stdin_buffer);
1413: buffer_free(&stdout_buffer);
1414: buffer_free(&stderr_buffer);
1415:
1416: /* Report bytes transferred, and transfer rates. */
1417: total_time = get_current_time() - start_time;
1418: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1419: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1420: if (total_time > 0)
1421: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1422: stdin_bytes / total_time, stdout_bytes / total_time,
1423: stderr_bytes / total_time);
1.11 markus 1424:
1425: /* Return the exit status of the program. */
1426: debug("Exit status %d", exit_status);
1427: return exit_status;
1.15 markus 1428: }
1429:
1430: /*********/
1431:
1.77 itojun 1432: static void
1.94 markus 1433: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1434: {
1.42 markus 1435: u_int data_len;
1.15 markus 1436: char *data = packet_get_string(&data_len);
1.93 markus 1437: packet_check_eom();
1.15 markus 1438: buffer_append(&stdout_buffer, data, data_len);
1439: memset(data, 0, data_len);
1440: xfree(data);
1441: }
1.77 itojun 1442: static void
1.94 markus 1443: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1444: {
1.42 markus 1445: u_int data_len;
1.15 markus 1446: char *data = packet_get_string(&data_len);
1.93 markus 1447: packet_check_eom();
1.15 markus 1448: buffer_append(&stderr_buffer, data, data_len);
1449: memset(data, 0, data_len);
1450: xfree(data);
1451: }
1.77 itojun 1452: static void
1.94 markus 1453: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1454: {
1455: exit_status = packet_get_int();
1.93 markus 1456: packet_check_eom();
1.15 markus 1457: /* Acknowledge the exit. */
1458: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1459: packet_send();
1460: /*
1461: * Must wait for packet to be sent since we are
1462: * exiting the loop.
1463: */
1464: packet_write_wait();
1465: /* Flag that we want to exit. */
1466: quit_pending = 1;
1467: }
1.115 markus 1468: static void
1469: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1470: {
1471: Channel *c = NULL;
1472: int remote_id, sock;
1473:
1474: /* Read the remote channel number from the message. */
1475: remote_id = packet_get_int();
1476: packet_check_eom();
1477:
1478: /*
1479: * Get a connection to the local authentication agent (this may again
1480: * get forwarded).
1481: */
1482: sock = ssh_get_authentication_socket();
1483:
1484: /*
1485: * If we could not connect the agent, send an error message back to
1486: * the server. This should never happen unless the agent dies,
1487: * because authentication forwarding is only enabled if we have an
1488: * agent.
1489: */
1490: if (sock >= 0) {
1491: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1492: -1, 0, 0, 0, "authentication agent connection", 1);
1493: c->remote_id = remote_id;
1494: c->force_drain = 1;
1495: }
1496: if (c == NULL) {
1497: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1498: packet_put_int(remote_id);
1499: } else {
1500: /* Send a confirmation to the remote host. */
1501: debug("Forwarding authentication connection.");
1502: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1503: packet_put_int(remote_id);
1504: packet_put_int(c->self);
1505: }
1506: packet_send();
1507: }
1.15 markus 1508:
1.77 itojun 1509: static Channel *
1.40 markus 1510: client_request_forwarded_tcpip(const char *request_type, int rchan)
1511: {
1.103 deraadt 1512: Channel *c = NULL;
1.40 markus 1513: char *listen_address, *originator_address;
1514: int listen_port, originator_port;
1.67 markus 1515: int sock;
1.40 markus 1516:
1517: /* Get rest of the packet */
1518: listen_address = packet_get_string(NULL);
1519: listen_port = packet_get_int();
1520: originator_address = packet_get_string(NULL);
1521: originator_port = packet_get_int();
1.93 markus 1522: packet_check_eom();
1.40 markus 1523:
1524: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1525: listen_address, listen_port, originator_address, originator_port);
1526:
1.80 stevesk 1527: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1528: if (sock < 0) {
1529: xfree(originator_address);
1530: xfree(listen_address);
1531: return NULL;
1532: }
1533: c = channel_new("forwarded-tcpip",
1534: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1535: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1536: originator_address, 1);
1.40 markus 1537: xfree(originator_address);
1538: xfree(listen_address);
1539: return c;
1540: }
1541:
1.103 deraadt 1542: static Channel *
1.40 markus 1543: client_request_x11(const char *request_type, int rchan)
1544: {
1545: Channel *c = NULL;
1546: char *originator;
1547: int originator_port;
1.67 markus 1548: int sock;
1.40 markus 1549:
1550: if (!options.forward_x11) {
1551: error("Warning: ssh server tried X11 forwarding.");
1552: error("Warning: this is probably a break in attempt by a malicious server.");
1553: return NULL;
1554: }
1555: originator = packet_get_string(NULL);
1556: if (datafellows & SSH_BUG_X11FWD) {
1557: debug2("buggy server: x11 request w/o originator_port");
1558: originator_port = 0;
1559: } else {
1560: originator_port = packet_get_int();
1561: }
1.93 markus 1562: packet_check_eom();
1.40 markus 1563: /* XXX check permission */
1.47 markus 1564: debug("client_request_x11: request from %s %d", originator,
1565: originator_port);
1.67 markus 1566: xfree(originator);
1.40 markus 1567: sock = x11_connect_display();
1.67 markus 1568: if (sock < 0)
1569: return NULL;
1570: c = channel_new("x11",
1571: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1572: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1573: c->force_drain = 1;
1.40 markus 1574: return c;
1575: }
1576:
1.103 deraadt 1577: static Channel *
1.40 markus 1578: client_request_agent(const char *request_type, int rchan)
1579: {
1580: Channel *c = NULL;
1.67 markus 1581: int sock;
1.40 markus 1582:
1583: if (!options.forward_agent) {
1584: error("Warning: ssh server tried agent forwarding.");
1585: error("Warning: this is probably a break in attempt by a malicious server.");
1586: return NULL;
1587: }
1588: sock = ssh_get_authentication_socket();
1.67 markus 1589: if (sock < 0)
1590: return NULL;
1591: c = channel_new("authentication agent connection",
1592: SSH_CHANNEL_OPEN, sock, sock, -1,
1593: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1594: "authentication agent connection", 1);
1.82 markus 1595: c->force_drain = 1;
1.40 markus 1596: return c;
1597: }
1598:
1.22 markus 1599: /* XXXX move to generic input handler */
1.77 itojun 1600: static void
1.94 markus 1601: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1602: {
1603: Channel *c = NULL;
1604: char *ctype;
1605: int rchan;
1.102 markus 1606: u_int rmaxpack, rwindow, len;
1.22 markus 1607:
1608: ctype = packet_get_string(&len);
1609: rchan = packet_get_int();
1610: rwindow = packet_get_int();
1611: rmaxpack = packet_get_int();
1612:
1.24 markus 1613: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1614: ctype, rchan, rwindow, rmaxpack);
1615:
1.40 markus 1616: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1617: c = client_request_forwarded_tcpip(ctype, rchan);
1618: } else if (strcmp(ctype, "x11") == 0) {
1619: c = client_request_x11(ctype, rchan);
1620: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1621: c = client_request_agent(ctype, rchan);
1.22 markus 1622: }
1623: /* XXX duplicate : */
1624: if (c != NULL) {
1625: debug("confirm %s", ctype);
1626: c->remote_id = rchan;
1627: c->remote_window = rwindow;
1628: c->remote_maxpacket = rmaxpack;
1.69 markus 1629: if (c->type != SSH_CHANNEL_CONNECTING) {
1630: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1631: packet_put_int(c->remote_id);
1632: packet_put_int(c->self);
1633: packet_put_int(c->local_window);
1634: packet_put_int(c->local_maxpacket);
1635: packet_send();
1636: }
1.22 markus 1637: } else {
1638: debug("failure %s", ctype);
1639: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1640: packet_put_int(rchan);
1641: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1642: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1643: packet_put_cstring("open failed");
1.66 markus 1644: packet_put_cstring("");
1645: }
1.22 markus 1646: packet_send();
1647: }
1648: xfree(ctype);
1649: }
1.77 itojun 1650: static void
1.94 markus 1651: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1652: {
1653: Channel *c = NULL;
1.123 djm 1654: int exitval, id, reply, success = 0;
1.48 markus 1655: char *rtype;
1656:
1657: id = packet_get_int();
1658: rtype = packet_get_string(NULL);
1659: reply = packet_get_char();
1660:
1661: debug("client_input_channel_req: channel %d rtype %s reply %d",
1662: id, rtype, reply);
1663:
1.128 djm 1664: if (id == -1) {
1665: error("client_input_channel_req: request for channel -1");
1666: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1667: error("client_input_channel_req: channel %d: unknown channel", id);
1668: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1669: exitval = packet_get_int();
1670: if (id == session_ident) {
1671: success = 1;
1672: exit_status = exitval;
1673: } else if (c->ctl_fd == -1) {
1674: error("client_input_channel_req: unexpected channel %d",
1675: session_ident);
1676: } else {
1677: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1678: success = 1;
1679: }
1.93 markus 1680: packet_check_eom();
1.48 markus 1681: }
1682: if (reply) {
1683: packet_start(success ?
1684: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1685: packet_put_int(id);
1.48 markus 1686: packet_send();
1687: }
1688: xfree(rtype);
1689: }
1.95 markus 1690: static void
1691: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1692: {
1693: char *rtype;
1694: int want_reply;
1695: int success = 0;
1696:
1697: rtype = packet_get_string(NULL);
1698: want_reply = packet_get_char();
1.117 markus 1699: debug("client_input_global_request: rtype %s want_reply %d",
1700: rtype, want_reply);
1.95 markus 1701: if (want_reply) {
1702: packet_start(success ?
1703: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1704: packet_send();
1705: packet_write_wait();
1706: }
1707: xfree(rtype);
1708: }
1.22 markus 1709:
1.123 djm 1710: void
1.129 deraadt 1711: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1712: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1713: dispatch_fn *subsys_repl)
1714: {
1715: int len;
1.132 djm 1716: Channel *c = NULL;
1.123 djm 1717:
1718: debug2("%s: id %d", __func__, id);
1719:
1.132 djm 1720: if ((c = channel_lookup(id)) == NULL)
1721: fatal("client_session2_setup: channel %d: unknown channel", id);
1722:
1.123 djm 1723: if (want_tty) {
1724: struct winsize ws;
1725: struct termios tio;
1726:
1727: /* Store window size in the packet. */
1728: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1729: memset(&ws, 0, sizeof(ws));
1730:
1731: channel_request_start(id, "pty-req", 0);
1732: packet_put_cstring(term != NULL ? term : "");
1733: packet_put_int(ws.ws_col);
1734: packet_put_int(ws.ws_row);
1735: packet_put_int(ws.ws_xpixel);
1736: packet_put_int(ws.ws_ypixel);
1737: tio = get_saved_tio();
1738: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1739: packet_send();
1740: /* XXX wait for reply */
1.132 djm 1741: c->client_tty = 1;
1.123 djm 1742: }
1743:
1744: /* Transfer any environment variables from client to server */
1.126 djm 1745: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1746: int i, j, matched;
1747: char *name, *val;
1748:
1749: debug("Sending environment.");
1.126 djm 1750: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1751: /* Split */
1.126 djm 1752: name = xstrdup(env[i]);
1.123 djm 1753: if ((val = strchr(name, '=')) == NULL) {
1754: free(name);
1755: continue;
1756: }
1757: *val++ = '\0';
1758:
1759: matched = 0;
1760: for (j = 0; j < options.num_send_env; j++) {
1761: if (match_pattern(name, options.send_env[j])) {
1762: matched = 1;
1763: break;
1764: }
1765: }
1766: if (!matched) {
1767: debug3("Ignored env %s", name);
1768: free(name);
1769: continue;
1770: }
1771:
1772: debug("Sending env %s = %s", name, val);
1773: channel_request_start(id, "env", 0);
1774: packet_put_cstring(name);
1775: packet_put_cstring(val);
1776: packet_send();
1777: free(name);
1778: }
1779: }
1780:
1781: len = buffer_len(cmd);
1782: if (len > 0) {
1783: if (len > 900)
1784: len = 900;
1785: if (want_subsystem) {
1786: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1787: channel_request_start(id, "subsystem", subsys_repl != NULL);
1788: if (subsys_repl != NULL) {
1789: /* register callback for reply */
1790: /* XXX we assume that client_loop has already been called */
1791: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1792: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1793: }
1794: } else {
1795: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1796: channel_request_start(id, "exec", 0);
1797: }
1798: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1799: packet_send();
1800: } else {
1801: channel_request_start(id, "shell", 0);
1802: packet_send();
1803: }
1804: }
1805:
1.77 itojun 1806: static void
1.49 itojun 1807: client_init_dispatch_20(void)
1.16 markus 1808: {
1.55 markus 1809: dispatch_init(&dispatch_protocol_error);
1.100 markus 1810:
1.16 markus 1811: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1812: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1813: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1814: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1815: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1816: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1817: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1818: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1819: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1820: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1821:
1822: /* rekeying */
1823: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1824:
1825: /* global request reply messages */
1826: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1827: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1828: }
1.77 itojun 1829: static void
1.49 itojun 1830: client_init_dispatch_13(void)
1.15 markus 1831: {
1832: dispatch_init(NULL);
1833: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1834: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1835: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1836: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1837: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1838: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1839: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1840: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1841: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1842:
1843: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1844: &client_input_agent_open : &deny_input_open);
1.39 markus 1845: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1846: &x11_input_open : &deny_input_open);
1.15 markus 1847: }
1.77 itojun 1848: static void
1.49 itojun 1849: client_init_dispatch_15(void)
1.15 markus 1850: {
1851: client_init_dispatch_13();
1852: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1853: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1854: }
1.79 stevesk 1855: static void
1.49 itojun 1856: client_init_dispatch(void)
1.15 markus 1857: {
1.16 markus 1858: if (compat20)
1859: client_init_dispatch_20();
1860: else if (compat13)
1.15 markus 1861: client_init_dispatch_13();
1862: else
1863: client_init_dispatch_15();
1.113 markus 1864: }
1865:
1866: /* client specific fatal cleanup */
1867: void
1.114 markus 1868: cleanup_exit(int i)
1.113 markus 1869: {
1870: leave_raw_mode();
1871: leave_non_blocking();
1.123 djm 1872: if (options.control_path != NULL && control_fd != -1)
1873: unlink(options.control_path);
1.114 markus 1874: _exit(i);
1.1 deraadt 1875: }
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