2 * Copyright (c) 1983, 1990, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#) Copyright (c) 1983, 1990, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)rsh.c 8.3 (Berkeley) 4/6/94
35 * $FreeBSD: src/usr.bin/rsh/rsh.c,v 1.21.2.4 2002/09/17 15:34:41 nectar Exp $
36 * $DragonFly: src/usr.bin/rsh/rsh.c,v 1.6 2005/01/01 22:00:15 cpressey Exp $
39 #include <sys/param.h>
40 #include <sys/signal.h>
41 #include <sys/socket.h>
42 #include <sys/ioctl.h>
46 #include <netinet/in.h>
59 #include "pathnames.h"
62 #include <openssl/des.h>
67 Key_schedule schedule;
68 int use_kerberos = 1, doencrypt;
69 char dst_realm_buf[REALM_SZ], *dest_realm;
70 extern char *krb_realmofhost();
78 int family = PF_UNSPEC;
80 void connect_timeout(int);
81 char *copyargs(char **);
83 void talk(int, long, pid_t, int, int);
86 static char rlogin[] = "rlogin";
89 main(int argc, char **argv)
94 int argoff, asrsh, ch, dflag, nflag, one, rem;
97 char *args, *host, *p, *user;
103 argoff = asrsh = dflag = nflag = 0;
107 /* if called as something other than "rsh", use it as the host name */
108 if ((p = strrchr(argv[0], '/')))
112 if (strcmp(p, "rsh"))
117 /* handle "rsh host flags" */
118 if (!host && argc > 2 && argv[1][0] != '-') {
125 #define OPTIONS "468KLde:k:l:nt:wx"
127 #define OPTIONS "468KLde:k:l:nt:w"
130 #define OPTIONS "468KLde:l:nt:w"
132 while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
147 case 'L': /* -8Lew are ignored to allow rlogin aliases */
160 dest_realm = dst_realm_buf;
161 strncpy(dest_realm, optarg, REALM_SZ);
175 timeout = atoi(optarg);
183 /* if haven't gotten a host yet, do so */
184 if (!host && !(host = argv[optind++]))
187 /* if no further arguments, must have been called as rlogin. */
191 execv(_PATH_RLOGIN, argv);
192 err(1, "can't exec %s", _PATH_RLOGIN);
198 if (!(pw = getpwuid(uid = getuid())))
199 errx(1, "unknown user id");
205 /* -x turns off -n */
211 args = copyargs(argv);
215 k = auth_getval("auth_list");
216 if (k && !strstr(k, "kerberos"))
219 sp = getservbyname((doencrypt ? "ekshell" : "kshell"), "tcp");
223 "warning, using standard rsh: can't get entry for %s/tcp service",
224 doencrypt ? "ekshell" : "kshell");
229 sp = getservbyname("shell", "tcp");
231 errx(1, "shell/tcp: unknown service");
238 /* fully qualify hostname (needed for krb_realmofhost) */
239 hp = gethostbyname(host);
240 if (hp != NULL && !(host = strdup(hp->h_name)))
245 if (dest_realm == NULL)
246 dest_realm = krb_realmofhost(host);
250 rem = krcmd_mutual(&host, sp->s_port, user, args,
251 &rfd2, dest_realm, &cred, schedule);
252 des_set_key(&cred.session, schedule);
255 rem = krcmd(&host, sp->s_port, user, args, &rfd2,
259 sp = getservbyname("shell", "tcp");
261 errx(1, "shell/tcp: unknown service");
262 if (errno == ECONNREFUSED)
264 "warning, using standard rsh: remote host doesn't support Kerberos");
267 "warning, using standard rsh: can't provide Kerberos auth data");
272 errx(1, "the -x flag requires Kerberos authentication");
273 rem = rcmd_af(&host, sp->s_port, pw->pw_name, user, args,
278 signal(SIGALRM, connect_timeout);
281 rem = rcmd_af(&host, sp->s_port, pw->pw_name, user, args, &rfd2,
284 signal(SIGALRM, SIG_DFL);
293 errx(1, "can't establish stderr");
295 if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one,
298 if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one,
304 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGTERM));
305 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
306 signal(SIGINT, sendsig);
307 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
308 signal(SIGQUIT, sendsig);
309 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
310 signal(SIGTERM, sendsig);
326 ioctl(rfd2, FIONBIO, &one);
327 ioctl(rem, FIONBIO, &one);
330 talk(nflag, omask, pid, rem, timeout);
338 talk(int nflag, long omask, pid_t pid, int rem, int timeout)
341 fd_set readfrom, ready, rembits;
342 char *bp, buf[BUFSIZ];
343 struct timeval tvtimeout;
346 if (!nflag && pid == 0) {
350 if ((cc = read(STDIN_FILENO, buf, sizeof(buf))) <= 0)
355 if (rem >= FD_SETSIZE)
356 errx(1, "descriptor too big");
358 FD_SET(rem, &rembits);
360 if (select(nfds, 0, &rembits, 0, 0) < 0) {
365 if (!FD_ISSET(rem, &rembits))
370 wc = des_enc_write(rem, bp, cc, schedule, &cred.session);
374 wc = write(rem, bp, cc);
376 if (errno == EWOULDBLOCK)
390 tvtimeout.tv_sec = timeout;
391 tvtimeout.tv_usec = 0;
394 if (rfd2 >= FD_SETSIZE || rem >= FD_SETSIZE)
395 errx(1, "descriptor too big");
397 FD_SET(rfd2, &readfrom);
398 FD_SET(rem, &readfrom);
399 nfds = MAX(rfd2+1, rem+1);
403 srval = select(nfds, &ready, 0, 0, &tvtimeout);
405 srval = select(nfds, &ready, 0, 0, 0);
414 errx(1, "timeout reached (%d seconds)", timeout);
415 if (FD_ISSET(rfd2, &ready)) {
420 cc = des_enc_read(rfd2, buf, sizeof(buf), schedule, &cred.session);
424 cc = read(rfd2, buf, sizeof(buf));
426 if (errno != EWOULDBLOCK)
427 FD_CLR(rfd2, &readfrom);
429 write(STDERR_FILENO, buf, cc);
431 if (FD_ISSET(rem, &ready)) {
436 cc = des_enc_read(rem, buf, sizeof(buf), schedule, &cred.session);
440 cc = read(rem, buf, sizeof(buf));
442 if (errno != EWOULDBLOCK)
443 FD_CLR(rem, &readfrom);
445 write(STDOUT_FILENO, buf, cc);
447 } while (FD_ISSET(rfd2, &readfrom) || FD_ISSET(rem, &readfrom));
451 connect_timeout(__unused int sig)
453 char message[] = "timeout reached before connection completed.\n";
455 write(STDERR_FILENO, message, sizeof(message) - 1);
468 des_enc_write(rfd2, &signo, 1, schedule, &cred.session);
472 write(rfd2, &signo, 1);
476 copyargs(char **argv)
479 char **ap, *args, *p;
482 for (ap = argv; *ap; ++ap)
483 cc += strlen(*ap) + 1;
484 if (!(args = malloc((u_int)cc)))
486 for (p = args, ap = argv; *ap; ++ap) {
488 for (p = strcpy(p, *ap); *p; ++p);
500 "usage: rsh [-46] [-ndK%s]%s[-l login] [-t timeout] host [command]\n",
503 "x", " [-k realm] ");