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
35 static const char copyright[] =
36 "@(#) Copyright (c) 1983, 1990, 1993, 1994\n\
37 The Regents of the University of California. All rights reserved.\n";
41 static const char sccsid[] = "From: @(#)rsh.c 8.3 (Berkeley) 4/6/94";
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
47 #include <sys/param.h>
48 #include <sys/signal.h>
49 #include <sys/socket.h>
50 #include <sys/ioctl.h>
54 #include <netinet/in.h>
68 #include "pathnames.h"
71 #include <openssl/des.h>
76 Key_schedule schedule;
77 int use_kerberos = 1, doencrypt;
78 char dst_realm_buf[REALM_SZ], *dest_realm;
79 extern char *krb_realmofhost();
87 int family = PF_UNSPEC;
88 char rlogin[] = "rlogin";
90 char *copyargs(char * const *);
92 void talk(int, long, pid_t, int, int);
96 main(int argc, char *argv[])
98 struct passwd const *pw;
99 struct servent const *sp;
101 int argoff, asrsh, ch, dflag, nflag, one, rem;
104 char *args, *host, *p, *user;
110 argoff = asrsh = dflag = nflag = 0;
114 /* if called as something other than "rsh", use it as the host name */
115 if ((p = strrchr(argv[0], '/')))
119 if (strcmp(p, "rsh"))
124 /* handle "rsh host flags" */
125 if (!host && argc > 2 && argv[1][0] != '-') {
132 #define OPTIONS "468KLde:k:l:nt:wx"
134 #define OPTIONS "468KLde:k:l:nt:w"
137 #define OPTIONS "468KLde:l:nt:w"
139 while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
154 case 'L': /* -8Lew are ignored to allow rlogin aliases */
167 dest_realm = dst_realm_buf;
168 strncpy(dest_realm, optarg, REALM_SZ);
182 timeout = atoi(optarg);
190 /* if haven't gotten a host yet, do so */
191 if (!host && !(host = argv[optind++]))
194 /* if no further arguments, must have been called as rlogin. */
198 execv(_PATH_RLOGIN, argv);
199 err(1, "can't exec %s", _PATH_RLOGIN);
205 if (!(pw = getpwuid(uid = getuid())))
206 errx(1, "unknown user id");
212 /* -x turns off -n */
218 args = copyargs(argv);
222 k = auth_getval("auth_list");
223 if (k && !strstr(k, "kerberos"))
226 sp = getservbyname((doencrypt ? "ekshell" : "kshell"), "tcp");
230 "warning, using standard rsh: can't get entry for %s/tcp service",
231 doencrypt ? "ekshell" : "kshell");
236 sp = getservbyname("shell", "tcp");
238 errx(1, "shell/tcp: unknown service");
245 /* fully qualify hostname (needed for krb_realmofhost) */
246 hp = gethostbyname(host);
247 if (hp != NULL && !(host = strdup(hp->h_name)))
252 if (dest_realm == NULL)
253 dest_realm = krb_realmofhost(host);
257 rem = krcmd_mutual(&host, sp->s_port, user, args,
258 &rfd2, dest_realm, &cred, schedule);
259 des_set_key(&cred.session, schedule);
262 rem = krcmd(&host, sp->s_port, user, args, &rfd2,
266 sp = getservbyname("shell", "tcp");
268 errx(1, "shell/tcp: unknown service");
269 if (errno == ECONNREFUSED)
271 "warning, using standard rsh: remote host doesn't support Kerberos");
274 "warning, using standard rsh: can't provide Kerberos auth data");
279 errx(1, "the -x flag requires Kerberos authentication");
280 rem = rcmd_af(&host, sp->s_port, pw->pw_name, user, args,
284 rem = rcmd_af(&host, sp->s_port, pw->pw_name, user, args, &rfd2,
292 errx(1, "can't establish stderr");
294 if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one,
297 if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one,
303 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGTERM));
304 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
305 (void)signal(SIGINT, sendsig);
306 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
307 (void)signal(SIGQUIT, sendsig);
308 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
309 (void)signal(SIGTERM, sendsig);
317 (void)shutdown(rem, 1);
325 (void)ioctl(rfd2, FIONBIO, &one);
326 (void)ioctl(rem, FIONBIO, &one);
329 talk(nflag, omask, pid, rem, timeout);
332 (void)kill(pid, SIGKILL);
337 talk(int nflag, long omask, pid_t pid, int rem, int timeout)
340 fd_set readfrom, ready, rembits;
343 struct timeval tvtimeout;
346 if (!nflag && pid == 0) {
350 if ((cc = read(0, buf, sizeof buf)) <= 0)
356 FD_SET(rem, &rembits);
358 if (select(nfds, 0, &rembits, 0, 0) < 0) {
363 if (!FD_ISSET(rem, &rembits))
368 wc = des_enc_write(rem, bp, cc, schedule, &cred.session);
372 wc = write(rem, bp, cc);
374 if (errno == EWOULDBLOCK)
384 (void)shutdown(rem, 1);
388 tvtimeout.tv_sec = timeout;
389 tvtimeout.tv_usec = 0;
391 (void)sigsetmask(omask);
393 FD_SET(rfd2, &readfrom);
394 FD_SET(rem, &readfrom);
395 nfds = MAX(rfd2+1, rem+1);
399 srval = select(nfds, &ready, 0, 0, &tvtimeout);
401 srval = select(nfds, &ready, 0, 0, 0);
410 errx(1, "timeout reached (%d seconds)\n", timeout);
411 if (FD_ISSET(rfd2, &ready)) {
416 cc = des_enc_read(rfd2, buf, sizeof buf, schedule, &cred.session);
420 cc = read(rfd2, buf, sizeof buf);
422 if (errno != EWOULDBLOCK)
423 FD_CLR(rfd2, &readfrom);
425 (void)write(STDERR_FILENO, buf, cc);
427 if (FD_ISSET(rem, &ready)) {
432 cc = des_enc_read(rem, buf, sizeof buf, schedule, &cred.session);
436 cc = read(rem, buf, sizeof buf);
438 if (errno != EWOULDBLOCK)
439 FD_CLR(rem, &readfrom);
441 (void)write(STDOUT_FILENO, buf, cc);
443 } while (FD_ISSET(rfd2, &readfrom) || FD_ISSET(rem, &readfrom));
455 (void)des_enc_write(rfd2, &signo, 1, schedule, &cred.session);
459 (void)write(rfd2, &signo, 1);
463 copyargs(char * const *argv)
470 for (ap = argv; *ap; ++ap)
471 cc += strlen(*ap) + 1;
472 if (!(args = malloc((u_int)cc)))
474 for (p = args, ap = argv; *ap; ++ap) {
475 (void)strcpy(p, *ap);
476 for (p = strcpy(p, *ap); *p; ++p);
487 (void)fprintf(stderr,
488 "usage: rsh [-46] [-ndK%s]%s[-l login] [-t timeout] host [command]\n",
491 "x", " [-k realm] ");