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. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)rsh.c 8.3 (Berkeley) 4/6/94
37 * $FreeBSD: src/usr.bin/rsh/rsh.c,v 1.35 2005/05/21 09:55:07 ru Exp $
38 * $DragonFly: src/usr.bin/rsh/rsh.c,v 1.7 2007/05/18 17:05:12 dillon Exp $
41 #include <sys/param.h>
42 #include <sys/signal.h>
43 #include <sys/socket.h>
44 #include <sys/ioctl.h>
48 #include <netinet/in.h>
67 int family = PF_UNSPEC;
68 char rlogin[] = "rlogin";
70 void connect_timeout(int);
71 char *copyargs(char * const *);
73 void talk(int, long, pid_t, int, int);
77 main(int argc, char **argv)
79 struct passwd const *pw;
80 struct servent const *sp;
82 int argoff, asrsh, ch, dflag, nflag, one, rem;
85 char *args, *host, *p, *user;
88 argoff = asrsh = dflag = nflag = 0;
92 /* if called as something other than "rsh", use it as the host name */
93 if ((p = strrchr(argv[0], '/')))
102 /* handle "rsh host flags" */
103 if (!host && argc > 2 && argv[1][0] != '-') {
108 #define OPTIONS "468Lde:l:nt:w"
109 while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
119 case 'L': /* -8Lew are ignored to allow rlogin aliases */
134 timeout = atoi(optarg);
142 /* if haven't gotten a host yet, do so */
143 if (!host && !(host = argv[optind++]))
146 /* if no further arguments, must have been called as rlogin. */
150 execv(_PATH_RLOGIN, argv);
151 err(1, "can't exec %s", _PATH_RLOGIN);
157 if (!(pw = getpwuid(uid = getuid())))
158 errx(1, "unknown user id");
162 args = copyargs(argv);
166 sp = getservbyname("shell", "tcp");
168 errx(1, "shell/tcp: unknown service");
171 signal(SIGALRM, connect_timeout);
174 rem = rcmd_af(&host, sp->s_port, pw->pw_name, user, args, &rfd2,
177 signal(SIGALRM, SIG_DFL);
185 errx(1, "can't establish stderr");
187 if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one,
190 if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one,
196 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGTERM));
197 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
198 signal(SIGINT, sendsig);
199 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
200 signal(SIGQUIT, sendsig);
201 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
202 signal(SIGTERM, sendsig);
210 shutdown(rem, SHUT_WR);
212 ioctl(rfd2, FIONBIO, &one);
213 ioctl(rem, FIONBIO, &one);
215 talk(nflag, omask, pid, rem, timeout);
223 talk(int nflag, long omask, pid_t pid, int rem, int timeout)
226 fd_set readfrom, ready, rembits;
229 struct timeval tvtimeout;
232 if (!nflag && pid == 0) {
236 if ((cc = read(STDIN_FILENO, buf, sizeof(buf))) <= 0)
241 if (rem >= FD_SETSIZE)
242 errx(1, "descriptor too big");
244 FD_SET(rem, &rembits);
246 if (select(nfds, 0, &rembits, 0, 0) < 0) {
251 if (!FD_ISSET(rem, &rembits))
253 wc = write(rem, bp, cc);
255 if (errno == EWOULDBLOCK)
265 shutdown(rem, SHUT_WR);
269 tvtimeout.tv_sec = timeout;
270 tvtimeout.tv_usec = 0;
273 if (rfd2 >= FD_SETSIZE || rem >= FD_SETSIZE)
274 errx(1, "descriptor too big");
276 FD_SET(rfd2, &readfrom);
277 FD_SET(rem, &readfrom);
278 nfds = MAX(rfd2+1, rem+1);
282 srval = select(nfds, &ready, 0, 0, &tvtimeout);
284 srval = select(nfds, &ready, 0, 0, 0);
293 errx(1, "timeout reached (%d seconds)", timeout);
294 if (FD_ISSET(rfd2, &ready)) {
296 cc = read(rfd2, buf, sizeof(buf));
298 if (errno != EWOULDBLOCK)
299 FD_CLR(rfd2, &readfrom);
301 write(STDERR_FILENO, buf, cc);
303 if (FD_ISSET(rem, &ready)) {
305 cc = read(rem, buf, sizeof(buf));
307 if (errno != EWOULDBLOCK)
308 FD_CLR(rem, &readfrom);
310 write(STDOUT_FILENO, buf, cc);
312 } while (FD_ISSET(rfd2, &readfrom) || FD_ISSET(rem, &readfrom));
316 connect_timeout(int sig __unused)
318 char message[] = "timeout reached before connection completed.\n";
320 write(STDERR_FILENO, message, sizeof(message) - 1);
330 write(rfd2, &signo, 1);
334 copyargs(char * const *argv)
341 for (ap = argv; *ap; ++ap)
342 cc += strlen(*ap) + 1;
343 if (!(args = malloc((u_int)cc)))
345 for (p = args, ap = argv; *ap; ++ap) {
347 for (p = strcpy(p, *ap); *p; ++p);
359 "usage: rsh [-46dn] [-l username] [-t timeout] host [command]\n");