2 * Copyright (c) 1983, 1990, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 2002 Networks Associates Technology, Inc.
7 * Portions of this software were developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 static const char copyright[] =
43 "@(#) Copyright (c) 1983, 1990, 1993, 1994\n\
44 The Regents of the University of California. All rights reserved.\n";
49 static const char sccsid[] = "From: @(#)rsh.c 8.3 (Berkeley) 4/6/94";
53 #include <sys/cdefs.h>
54 __FBSDID("$FreeBSD$");
56 #include <sys/param.h>
57 #include <sys/signal.h>
58 #include <sys/socket.h>
59 #include <sys/ioctl.h>
63 #include <netinet/in.h>
82 int family = PF_UNSPEC;
83 char rlogin[] = "rlogin";
85 void connect_timeout(int);
86 char *copyargs(char * const *);
88 void talk(int, long, pid_t, int, int);
92 main(int argc, char *argv[])
94 struct passwd const *pw;
95 struct servent const *sp;
97 int argoff, asrsh, ch, dflag, nflag, one, rem;
100 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] != '-') {
123 #define OPTIONS "468Lde:l:nt:w"
124 while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
134 case 'L': /* -8Lew are ignored to allow rlogin aliases */
149 timeout = atoi(optarg);
157 /* if haven't gotten a host yet, do so */
158 if (!host && !(host = argv[optind++]))
161 /* if no further arguments, must have been called as rlogin. */
165 execv(_PATH_RLOGIN, argv);
166 err(1, "can't exec %s", _PATH_RLOGIN);
172 if (!(pw = getpwuid(uid = getuid())))
173 errx(1, "unknown user id");
177 args = copyargs(argv);
181 sp = getservbyname("shell", "tcp");
183 errx(1, "shell/tcp: unknown service");
186 signal(SIGALRM, connect_timeout);
189 rem = rcmd_af(&host, sp->s_port, pw->pw_name, user, args, &rfd2,
192 signal(SIGALRM, SIG_DFL);
200 errx(1, "can't establish stderr");
202 if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one,
205 if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one,
211 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGTERM));
212 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
213 (void)signal(SIGINT, sendsig);
214 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
215 (void)signal(SIGQUIT, sendsig);
216 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
217 (void)signal(SIGTERM, sendsig);
225 (void)shutdown(rem, SHUT_WR);
227 (void)ioctl(rfd2, FIONBIO, &one);
228 (void)ioctl(rem, FIONBIO, &one);
230 talk(nflag, omask, pid, rem, timeout);
233 (void)kill(pid, SIGKILL);
238 talk(int nflag, long omask, pid_t pid, int rem, int timeout)
241 fd_set readfrom, ready, rembits;
244 struct timeval tvtimeout;
247 if (!nflag && pid == 0) {
251 if ((cc = read(0, buf, sizeof buf)) <= 0)
256 if (rem >= FD_SETSIZE)
257 errx(1, "descriptor too big");
259 FD_SET(rem, &rembits);
261 if (select(nfds, 0, &rembits, 0, 0) < 0) {
266 if (!FD_ISSET(rem, &rembits))
268 wc = write(rem, bp, cc);
270 if (errno == EWOULDBLOCK)
280 (void)shutdown(rem, SHUT_WR);
284 tvtimeout.tv_sec = timeout;
285 tvtimeout.tv_usec = 0;
287 (void)sigsetmask(omask);
288 if (rfd2 >= FD_SETSIZE || rem >= FD_SETSIZE)
289 errx(1, "descriptor too big");
291 FD_SET(rfd2, &readfrom);
292 FD_SET(rem, &readfrom);
293 nfds = MAX(rfd2+1, rem+1);
297 srval = select(nfds, &ready, 0, 0, &tvtimeout);
299 srval = select(nfds, &ready, 0, 0, 0);
308 errx(1, "timeout reached (%d seconds)", timeout);
309 if (FD_ISSET(rfd2, &ready)) {
311 cc = read(rfd2, buf, sizeof buf);
313 if (errno != EWOULDBLOCK)
314 FD_CLR(rfd2, &readfrom);
316 (void)write(STDERR_FILENO, buf, cc);
318 if (FD_ISSET(rem, &ready)) {
320 cc = read(rem, buf, sizeof buf);
322 if (errno != EWOULDBLOCK)
323 FD_CLR(rem, &readfrom);
325 (void)write(STDOUT_FILENO, buf, cc);
327 } while (FD_ISSET(rfd2, &readfrom) || FD_ISSET(rem, &readfrom));
331 connect_timeout(int sig __unused)
333 char message[] = "timeout reached before connection completed.\n";
335 write(STDERR_FILENO, message, sizeof(message) - 1);
345 (void)write(rfd2, &signo, 1);
349 copyargs(char * const *argv)
356 for (ap = argv; *ap; ++ap)
357 cc += strlen(*ap) + 1;
358 if (!(args = malloc((u_int)cc)))
360 for (p = args, ap = argv; *ap; ++ap) {
361 (void)strcpy(p, *ap);
362 for (p = strcpy(p, *ap); *p; ++p);
373 (void)fprintf(stderr,
374 "usage: rsh [-46dn] [-l username] [-t timeout] host [command]\n");