Annotation of src/usr.bin/ssh/mux.c, Revision 1.2
1.2 ! djm 1: /* $OpenBSD: mux.c,v 1.1 2008/05/09 14:18:44 djm Exp $ */
1.1 djm 2: /*
3: * Copyright (c) 2002-2008 Damien Miller <djm@openbsd.org>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
17:
18: /* ssh session multiplexing support */
19:
1.2 ! djm 20: /*
! 21: * TODO:
! 22: * 1. partial reads in muxserver_accept_control (maybe make channels
! 23: * from accepted connections)
! 24: * 2. Better signalling from master to slave, especially passing of
! 25: * error messages
! 26: * 3. Better fall-back from mux slave error to new connection.
! 27: * 3. Add/delete forwardings via slave
! 28: * 4. ExitOnForwardingFailure (after #3 obviously)
! 29: * 5. Maybe extension mechanisms for multi-X11/multi-agent forwarding
! 30: * 6. Document the mux mini-protocol somewhere.
! 31: * 6. Support ~^Z in mux slaves.
! 32: */
! 33:
1.1 djm 34: #include <sys/types.h>
35: #include <sys/param.h>
36: #include <sys/queue.h>
37: #include <sys/stat.h>
38: #include <sys/socket.h>
39: #include <sys/un.h>
40:
41: #include <errno.h>
42: #include <fcntl.h>
43: #include <signal.h>
44: #include <stdarg.h>
45: #include <stddef.h>
46: #include <stdlib.h>
47: #include <stdio.h>
48: #include <string.h>
49: #include <unistd.h>
50: #include <util.h>
51: #include <paths.h>
52:
53: #include "xmalloc.h"
54: #include "log.h"
55: #include "ssh.h"
56: #include "pathnames.h"
57: #include "misc.h"
58: #include "match.h"
59: #include "buffer.h"
60: #include "channels.h"
61: #include "msg.h"
62: #include "packet.h"
63: #include "monitor_fdpass.h"
64: #include "sshpty.h"
65: #include "key.h"
66: #include "readconf.h"
67: #include "clientloop.h"
68:
69: /* from ssh.c */
70: extern int tty_flag;
71: extern Options options;
72: extern int stdin_null_flag;
73: extern char *host;
74: int subsystem_flag;
75: extern Buffer command;
76:
1.2 ! djm 77: /* Context for session open confirmation callback */
! 78: struct mux_session_confirm_ctx {
! 79: int want_tty;
! 80: int want_subsys;
! 81: int want_x_fwd;
! 82: int want_agent_fwd;
! 83: Buffer cmd;
! 84: char *term;
! 85: struct termios tio;
! 86: char **env;
! 87: };
! 88:
1.1 djm 89: /* fd to control socket */
90: int muxserver_sock = -1;
91:
92: /* Multiplexing control command */
93: u_int muxclient_command = 0;
94:
95: /* Set when signalled. */
96: static volatile sig_atomic_t muxclient_terminate = 0;
97:
98: /* PID of multiplex server */
99: static u_int muxserver_pid = 0;
100:
101:
102: /* ** Multiplexing master support */
103:
104: /* Prepare a mux master to listen on a Unix domain socket. */
105: void
106: muxserver_listen(void)
107: {
108: struct sockaddr_un addr;
109: mode_t old_umask;
110:
111: if (options.control_path == NULL ||
112: options.control_master == SSHCTL_MASTER_NO)
113: return;
114:
115: debug("setting up multiplex master socket");
116:
117: memset(&addr, '\0', sizeof(addr));
118: addr.sun_family = AF_UNIX;
119: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
120: strlen(options.control_path) + 1;
121:
122: if (strlcpy(addr.sun_path, options.control_path,
123: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
124: fatal("ControlPath too long");
125:
126: if ((muxserver_sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
127: fatal("%s socket(): %s", __func__, strerror(errno));
128:
129: old_umask = umask(0177);
130: if (bind(muxserver_sock, (struct sockaddr *)&addr, addr.sun_len) == -1) {
131: muxserver_sock = -1;
132: if (errno == EINVAL || errno == EADDRINUSE)
133: fatal("ControlSocket %s already exists",
134: options.control_path);
135: else
136: fatal("%s bind(): %s", __func__, strerror(errno));
137: }
138: umask(old_umask);
139:
140: if (listen(muxserver_sock, 64) == -1)
141: fatal("%s listen(): %s", __func__, strerror(errno));
142:
143: set_nonblock(muxserver_sock);
144: }
145:
146: /* Callback on open confirmation in mux master for a mux client session. */
147: static void
1.2 ! djm 148: mux_session_confirm(int id, void *arg)
1.1 djm 149: {
150: struct mux_session_confirm_ctx *cctx = arg;
151: const char *display;
152: Channel *c;
153: int i;
154:
155: if (cctx == NULL)
156: fatal("%s: cctx == NULL", __func__);
157: if ((c = channel_lookup(id)) == NULL)
158: fatal("%s: no channel for id %d", __func__, id);
159:
160: display = getenv("DISPLAY");
161: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
162: char *proto, *data;
163: /* Get reasonable local authentication information. */
164: client_x11_get_proto(display, options.xauth_location,
165: options.forward_x11_trusted, &proto, &data);
166: /* Request forwarding with authentication spoofing. */
167: debug("Requesting X11 forwarding with authentication spoofing.");
168: x11_request_forwarding_with_spoofing(id, display, proto, data);
169: /* XXX wait for reply */
170: }
171:
172: if (cctx->want_agent_fwd && options.forward_agent) {
173: debug("Requesting authentication agent forwarding.");
174: channel_request_start(id, "auth-agent-req@openssh.com", 0);
175: packet_send();
176: }
177:
178: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
179: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env);
180:
181: c->open_confirm_ctx = NULL;
182: buffer_free(&cctx->cmd);
183: xfree(cctx->term);
184: if (cctx->env != NULL) {
185: for (i = 0; cctx->env[i] != NULL; i++)
186: xfree(cctx->env[i]);
187: xfree(cctx->env);
188: }
189: xfree(cctx);
190: }
191:
192: /*
193: * Accept a connection on the mux master socket and process the
194: * client's request. Returns flag indicating whether mux master should
195: * begin graceful close.
196: */
197: int
198: muxserver_accept_control(void)
199: {
200: Buffer m;
201: Channel *c;
202: int client_fd, new_fd[3], ver, allowed, window, packetmax;
203: socklen_t addrlen;
204: struct sockaddr_storage addr;
205: struct mux_session_confirm_ctx *cctx;
206: char *cmd;
1.2 ! djm 207: u_int i, j, len, env_len, mux_command, flags, escape_char;
1.1 djm 208: uid_t euid;
209: gid_t egid;
210: int start_close = 0;
211:
212: /*
213: * Accept connection on control socket
214: */
215: memset(&addr, 0, sizeof(addr));
216: addrlen = sizeof(addr);
217: if ((client_fd = accept(muxserver_sock,
218: (struct sockaddr*)&addr, &addrlen)) == -1) {
219: error("%s accept: %s", __func__, strerror(errno));
220: return 0;
221: }
222:
223: if (getpeereid(client_fd, &euid, &egid) < 0) {
224: error("%s getpeereid failed: %s", __func__, strerror(errno));
225: close(client_fd);
226: return 0;
227: }
228: if ((euid != 0) && (getuid() != euid)) {
229: error("control mode uid mismatch: peer euid %u != uid %u",
230: (u_int) euid, (u_int) getuid());
231: close(client_fd);
232: return 0;
233: }
234:
235: /* XXX handle asynchronously */
236: unset_nonblock(client_fd);
237:
238: /* Read command */
239: buffer_init(&m);
240: if (ssh_msg_recv(client_fd, &m) == -1) {
241: error("%s: client msg_recv failed", __func__);
242: close(client_fd);
243: buffer_free(&m);
244: return 0;
245: }
246: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
247: error("%s: wrong client version %d", __func__, ver);
248: buffer_free(&m);
249: close(client_fd);
250: return 0;
251: }
252:
253: allowed = 1;
254: mux_command = buffer_get_int(&m);
255: flags = buffer_get_int(&m);
256:
257: buffer_clear(&m);
258:
259: switch (mux_command) {
260: case SSHMUX_COMMAND_OPEN:
261: if (options.control_master == SSHCTL_MASTER_ASK ||
262: options.control_master == SSHCTL_MASTER_AUTO_ASK)
263: allowed = ask_permission("Allow shared connection "
264: "to %s? ", host);
265: /* continue below */
266: break;
267: case SSHMUX_COMMAND_TERMINATE:
268: if (options.control_master == SSHCTL_MASTER_ASK ||
269: options.control_master == SSHCTL_MASTER_AUTO_ASK)
270: allowed = ask_permission("Terminate shared connection "
271: "to %s? ", host);
272: if (allowed)
273: start_close = 1;
274: /* FALLTHROUGH */
275: case SSHMUX_COMMAND_ALIVE_CHECK:
276: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
277: buffer_clear(&m);
278: buffer_put_int(&m, allowed);
279: buffer_put_int(&m, getpid());
280: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
281: error("%s: client msg_send failed", __func__);
282: close(client_fd);
283: buffer_free(&m);
284: return start_close;
285: }
286: buffer_free(&m);
287: close(client_fd);
288: return start_close;
289: default:
290: error("Unsupported command %d", mux_command);
291: buffer_free(&m);
292: close(client_fd);
293: return 0;
294: }
295:
296: /* Reply for SSHMUX_COMMAND_OPEN */
297: buffer_clear(&m);
298: buffer_put_int(&m, allowed);
299: buffer_put_int(&m, getpid());
300: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
301: error("%s: client msg_send failed", __func__);
302: close(client_fd);
303: buffer_free(&m);
304: return 0;
305: }
306:
307: if (!allowed) {
308: error("Refused control connection");
309: close(client_fd);
310: buffer_free(&m);
311: return 0;
312: }
313:
314: buffer_clear(&m);
315: if (ssh_msg_recv(client_fd, &m) == -1) {
316: error("%s: client msg_recv failed", __func__);
317: close(client_fd);
318: buffer_free(&m);
319: return 0;
320: }
321: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
322: error("%s: wrong client version %d", __func__, ver);
323: buffer_free(&m);
324: close(client_fd);
325: return 0;
326: }
327:
328: cctx = xcalloc(1, sizeof(*cctx));
329: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
330: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
331: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
332: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
333: cctx->term = buffer_get_string(&m, &len);
1.2 ! djm 334: escape_char = buffer_get_int(&m);
1.1 djm 335:
336: cmd = buffer_get_string(&m, &len);
337: buffer_init(&cctx->cmd);
338: buffer_append(&cctx->cmd, cmd, strlen(cmd));
339:
340: env_len = buffer_get_int(&m);
341: env_len = MIN(env_len, 4096);
342: debug3("%s: receiving %d env vars", __func__, env_len);
343: if (env_len != 0) {
344: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
345: for (i = 0; i < env_len; i++)
346: cctx->env[i] = buffer_get_string(&m, &len);
347: cctx->env[i] = NULL;
348: }
349:
350: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
351: cctx->want_tty, cctx->want_subsys, cmd);
352: xfree(cmd);
353:
354: /* Gather fds from client */
355: for(i = 0; i < 3; i++) {
356: if ((new_fd[i] = mm_receive_fd(client_fd)) == -1) {
357: error("%s: failed to receive fd %d from slave",
358: __func__, i);
359: for (j = 0; j < i; j++)
360: close(new_fd[j]);
361: for (j = 0; j < env_len; j++)
362: xfree(cctx->env[j]);
363: if (env_len > 0)
364: xfree(cctx->env);
365: xfree(cctx->term);
366: buffer_free(&cctx->cmd);
367: close(client_fd);
368: xfree(cctx);
369: return 0;
370: }
371: }
372:
373: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
374: new_fd[0], new_fd[1], new_fd[2]);
375:
376: /* Try to pick up ttymodes from client before it goes raw */
377: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
378: error("%s: tcgetattr: %s", __func__, strerror(errno));
379:
380: /* This roundtrip is just for synchronisation of ttymodes */
381: buffer_clear(&m);
382: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
383: error("%s: client msg_send failed", __func__);
384: close(client_fd);
385: close(new_fd[0]);
386: close(new_fd[1]);
387: close(new_fd[2]);
388: buffer_free(&m);
389: xfree(cctx->term);
390: if (env_len != 0) {
391: for (i = 0; i < env_len; i++)
392: xfree(cctx->env[i]);
393: xfree(cctx->env);
394: }
395: return 0;
396: }
397: buffer_free(&m);
398:
399: /* enable nonblocking unless tty */
400: if (!isatty(new_fd[0]))
401: set_nonblock(new_fd[0]);
402: if (!isatty(new_fd[1]))
403: set_nonblock(new_fd[1]);
404: if (!isatty(new_fd[2]))
405: set_nonblock(new_fd[2]);
406:
407: set_nonblock(client_fd);
408:
409: window = CHAN_SES_WINDOW_DEFAULT;
410: packetmax = CHAN_SES_PACKET_DEFAULT;
411: if (cctx->want_tty) {
412: window >>= 1;
413: packetmax >>= 1;
414: }
415:
416: c = channel_new("session", SSH_CHANNEL_OPENING,
417: new_fd[0], new_fd[1], new_fd[2], window, packetmax,
418: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
419:
420: c->ctl_fd = client_fd;
1.2 ! djm 421: if (cctx->want_tty && escape_char != 0xffffffff) {
! 422: channel_register_filter(c->self,
! 423: client_simple_escape_filter, NULL,
! 424: client_new_escape_filter_ctx((int)escape_char));
! 425: }
1.1 djm 426:
427: debug3("%s: channel_new: %d", __func__, c->self);
428:
429: channel_send_open(c->self);
1.2 ! djm 430: channel_register_open_confirm(c->self, mux_session_confirm, cctx);
1.1 djm 431: return 0;
432: }
433:
434: /* ** Multiplexing client support */
435:
436: /* Exit signal handler */
437: static void
438: control_client_sighandler(int signo)
439: {
440: muxclient_terminate = signo;
441: }
442:
443: /*
444: * Relay signal handler - used to pass some signals from mux client to
445: * mux master.
446: */
447: static void
448: control_client_sigrelay(int signo)
449: {
450: int save_errno = errno;
451:
452: if (muxserver_pid > 1)
453: kill(muxserver_pid, signo);
454:
455: errno = save_errno;
456: }
457:
458: /* Check mux client environment variables before passing them to mux master. */
459: static int
460: env_permitted(char *env)
461: {
462: int i, ret;
463: char name[1024], *cp;
464:
465: if ((cp = strchr(env, '=')) == NULL || cp == env)
466: return (0);
467: ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env);
468: if (ret <= 0 || (size_t)ret >= sizeof(name))
469: fatal("env_permitted: name '%.100s...' too long", env);
470:
471: for (i = 0; i < options.num_send_env; i++)
472: if (match_pattern(name, options.send_env[i]))
473: return (1);
474:
475: return (0);
476: }
477:
478: /* Multiplex client main loop. */
479: void
480: muxclient(const char *path)
481: {
482: struct sockaddr_un addr;
483: int i, r, fd, sock, exitval[2], num_env;
484: Buffer m;
485: char *term;
486: extern char **environ;
487: u_int flags;
488:
489: if (muxclient_command == 0)
490: muxclient_command = SSHMUX_COMMAND_OPEN;
491:
492: switch (options.control_master) {
493: case SSHCTL_MASTER_AUTO:
494: case SSHCTL_MASTER_AUTO_ASK:
495: debug("auto-mux: Trying existing master");
496: /* FALLTHROUGH */
497: case SSHCTL_MASTER_NO:
498: break;
499: default:
500: return;
501: }
502:
503: memset(&addr, '\0', sizeof(addr));
504: addr.sun_family = AF_UNIX;
505: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
506: strlen(path) + 1;
507:
508: if (strlcpy(addr.sun_path, path,
509: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
510: fatal("ControlPath too long");
511:
512: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
513: fatal("%s socket(): %s", __func__, strerror(errno));
514:
515: if (connect(sock, (struct sockaddr *)&addr, addr.sun_len) == -1) {
516: if (muxclient_command != SSHMUX_COMMAND_OPEN) {
517: fatal("Control socket connect(%.100s): %s", path,
518: strerror(errno));
519: }
520: if (errno == ENOENT)
521: debug("Control socket \"%.100s\" does not exist", path);
522: else {
523: error("Control socket connect(%.100s): %s", path,
524: strerror(errno));
525: }
526: close(sock);
527: return;
528: }
529:
530: if (stdin_null_flag) {
531: if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
532: fatal("open(/dev/null): %s", strerror(errno));
533: if (dup2(fd, STDIN_FILENO) == -1)
534: fatal("dup2: %s", strerror(errno));
535: if (fd > STDERR_FILENO)
536: close(fd);
537: }
538:
539: term = getenv("TERM");
540:
541: flags = 0;
542: if (tty_flag)
543: flags |= SSHMUX_FLAG_TTY;
544: if (subsystem_flag)
545: flags |= SSHMUX_FLAG_SUBSYS;
546: if (options.forward_x11)
547: flags |= SSHMUX_FLAG_X11_FWD;
548: if (options.forward_agent)
549: flags |= SSHMUX_FLAG_AGENT_FWD;
550:
551: signal(SIGPIPE, SIG_IGN);
552:
553: buffer_init(&m);
554:
555: /* Send our command to server */
556: buffer_put_int(&m, muxclient_command);
557: buffer_put_int(&m, flags);
558: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
559: fatal("%s: msg_send", __func__);
560: buffer_clear(&m);
561:
562: /* Get authorisation status and PID of controlee */
563: if (ssh_msg_recv(sock, &m) == -1)
564: fatal("%s: msg_recv", __func__);
565: if (buffer_get_char(&m) != SSHMUX_VER)
566: fatal("%s: wrong version", __func__);
567: if (buffer_get_int(&m) != 1)
568: fatal("Connection to master denied");
569: muxserver_pid = buffer_get_int(&m);
570:
571: buffer_clear(&m);
572:
573: switch (muxclient_command) {
574: case SSHMUX_COMMAND_ALIVE_CHECK:
575: fprintf(stderr, "Master running (pid=%d)\r\n",
576: muxserver_pid);
577: exit(0);
578: case SSHMUX_COMMAND_TERMINATE:
579: fprintf(stderr, "Exit request sent.\r\n");
580: exit(0);
581: case SSHMUX_COMMAND_OPEN:
1.2 ! djm 582: buffer_put_cstring(&m, term ? term : "");
! 583: if (options.escape_char == SSH_ESCAPECHAR_NONE)
! 584: buffer_put_int(&m, 0xffffffff);
! 585: else
! 586: buffer_put_int(&m, options.escape_char);
! 587: buffer_append(&command, "\0", 1);
! 588: buffer_put_cstring(&m, buffer_ptr(&command));
! 589:
! 590: if (options.num_send_env == 0 || environ == NULL) {
! 591: buffer_put_int(&m, 0);
! 592: } else {
! 593: /* Pass environment */
! 594: num_env = 0;
! 595: for (i = 0; environ[i] != NULL; i++) {
! 596: if (env_permitted(environ[i]))
! 597: num_env++; /* Count */
! 598: }
! 599: buffer_put_int(&m, num_env);
! 600: for (i = 0; environ[i] != NULL && num_env >= 0; i++) {
! 601: if (env_permitted(environ[i])) {
! 602: num_env--;
! 603: buffer_put_cstring(&m, environ[i]);
! 604: }
! 605: }
! 606: }
1.1 djm 607: break;
608: default:
1.2 ! djm 609: fatal("unrecognised muxclient_command %d", muxclient_command);
1.1 djm 610: }
611:
612: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
613: fatal("%s: msg_send", __func__);
614:
615: if (mm_send_fd(sock, STDIN_FILENO) == -1 ||
616: mm_send_fd(sock, STDOUT_FILENO) == -1 ||
617: mm_send_fd(sock, STDERR_FILENO) == -1)
618: fatal("%s: send fds failed", __func__);
619:
620: /* Wait for reply, so master has a chance to gather ttymodes */
621: buffer_clear(&m);
622: if (ssh_msg_recv(sock, &m) == -1)
623: fatal("%s: msg_recv", __func__);
624: if (buffer_get_char(&m) != SSHMUX_VER)
625: fatal("%s: wrong version", __func__);
626: buffer_free(&m);
627:
628: signal(SIGHUP, control_client_sighandler);
629: signal(SIGINT, control_client_sighandler);
630: signal(SIGTERM, control_client_sighandler);
631: signal(SIGWINCH, control_client_sigrelay);
632:
633: if (tty_flag)
634: enter_raw_mode();
635:
636: /*
637: * Stick around until the controlee closes the client_fd.
638: * Before it does, it is expected to write this process' exit
639: * value (one int). This process must read the value and wait for
640: * the closure of the client_fd; if this one closes early, the
641: * multiplex master will terminate early too (possibly losing data).
642: */
643: exitval[0] = 0;
644: for (i = 0; !muxclient_terminate && i < (int)sizeof(exitval);) {
645: r = read(sock, (char *)exitval + i, sizeof(exitval) - i);
646: if (r == 0) {
647: debug2("Received EOF from master");
648: break;
649: }
650: if (r == -1) {
651: if (errno == EINTR)
652: continue;
653: fatal("%s: read %s", __func__, strerror(errno));
654: }
655: i += r;
656: }
657:
658: close(sock);
659: leave_raw_mode();
660: if (i > (int)sizeof(int))
661: fatal("%s: master returned too much data (%d > %lu)",
662: __func__, i, sizeof(int));
663: if (muxclient_terminate) {
664: debug2("Exiting on signal %d", muxclient_terminate);
665: exitval[0] = 255;
666: } else if (i < (int)sizeof(int)) {
667: debug2("Control master terminated unexpectedly");
668: exitval[0] = 255;
669: } else
670: debug2("Received exit status from master %d", exitval[0]);
671:
672: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
673: fprintf(stderr, "Shared connection to %s closed.\r\n", host);
674:
675: exit(exitval[0]);
676: }
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