[dragonfly.git] / usr.bin / rsh / rsh.c

/*-
 * Copyright (c) 1983, 1990, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 2002 Networks Associates Technology, Inc.
 * All rights reserved.
 *
 * Portions of this software were developed for the FreeBSD Project by
 * ThinkSec AS and NAI Labs, the Security Research Division of Network
 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
 * ("CBOSS"), as part of the DARPA CHATS research program.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#)rsh.c	8.3 (Berkeley) 4/6/94
 * $FreeBSD: src/usr.bin/rsh/rsh.c,v 1.35 2005/05/21 09:55:07 ru Exp $
 * $DragonFly: src/usr.bin/rsh/rsh.c,v 1.7 2007/05/18 17:05:12 dillon Exp $
 */

#include <sys/param.h>
#include <sys/signal.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/time.h>

#include <netinet/in.h>
#include <netdb.h>

#include <err.h>
#include <errno.h>
#include <libutil.h>
#include <paths.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

/*
 * rsh - remote shell
 */
int	rfd2;

int family = PF_UNSPEC;
char rlogin[] = "rlogin";

void	connect_timeout(int);
char   *copyargs(char * const *);
void	sendsig(int);
void	talk(int, long, pid_t, int, int);
void	usage(void);

int
main(int argc, char **argv)
{
	struct passwd const *pw;
	struct servent const *sp;
	long omask;
	int argoff, asrsh, ch, dflag, nflag, one, rem;
	pid_t pid = 0;
	uid_t uid;
	char *args, *host, *p, *user;
	int timeout = 0;

	argoff = asrsh = dflag = nflag = 0;
	one = 1;
	host = user = NULL;

	/* if called as something other than "rsh", use it as the host name */
	if ((p = strrchr(argv[0], '/')))
		++p;
	else
		p = argv[0];
	if (strcmp(p, "rsh"))
		host = p;
	else
		asrsh = 1;

	/* handle "rsh host flags" */
	if (!host && argc > 2 && argv[1][0] != '-') {
		host = argv[1];
		argoff = 1;
	}

#define	OPTIONS	"468Lde:l:nt:w"
	while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
		switch(ch) {
		case '4':
			family = PF_INET;
			break;

		case '6':
			family = PF_INET6;
			break;

		case 'L':	/* -8Lew are ignored to allow rlogin aliases */
		case 'e':
		case 'w':
		case '8':
			break;
		case 'd':
			dflag = 1;
			break;
		case 'l':
			user = optarg;
			break;
		case 'n':
			nflag = 1;
			break;
		case 't':
			timeout = atoi(optarg);
			break;
		case '?':
		default:
			usage();
		}
	optind += argoff;

	/* if haven't gotten a host yet, do so */
	if (!host && !(host = argv[optind++]))
		usage();

	/* if no further arguments, must have been called as rlogin. */
	if (!argv[optind]) {
		if (asrsh)
			*argv = rlogin;
		execv(_PATH_RLOGIN, argv);
		err(1, "can't exec %s", _PATH_RLOGIN);
	}

	argc -= optind;
	argv += optind;

	if (!(pw = getpwuid(uid = getuid())))
		errx(1, "unknown user id");
	if (!user)
		user = pw->pw_name;

	args = copyargs(argv);

	sp = NULL;
	if (sp == NULL)
		sp = getservbyname("shell", "tcp");
	if (sp == NULL)
		errx(1, "shell/tcp: unknown service");

	if (timeout) {
		signal(SIGALRM, connect_timeout);
		alarm(timeout);
	}
	rem = rcmd_af(&host, sp->s_port, pw->pw_name, user, args, &rfd2,
		      family);
	if (timeout) {
		signal(SIGALRM, SIG_DFL);
		alarm(0);
	}

	if (rem < 0)
		exit(1);

	if (rfd2 < 0)
		errx(1, "can't establish stderr");
	if (dflag) {
		if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one,
		    sizeof(one)) < 0)
			warn("setsockopt");
		if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one,
		    sizeof(one)) < 0)
			warn("setsockopt");
	}

	setuid(uid);
	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGTERM));
	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
		signal(SIGINT, sendsig);
	if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
		signal(SIGQUIT, sendsig);
	if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
		signal(SIGTERM, sendsig);

	if (!nflag) {
		pid = fork();
		if (pid < 0)
			err(1, "fork");
	}
	else
		shutdown(rem, SHUT_WR);

	ioctl(rfd2, FIONBIO, &one);
	ioctl(rem, FIONBIO, &one);

	talk(nflag, omask, pid, rem, timeout);

	if (!nflag)
		kill(pid, SIGKILL);
	exit(0);
}

void
talk(int nflag, long omask, pid_t pid, int rem, int timeout)
{
	int cc, wc;
	fd_set readfrom, ready, rembits;
	char buf[BUFSIZ];
	const char *bp;
	struct timeval tvtimeout;
	int nfds, srval;

	if (!nflag && pid == 0) {
		close(rfd2);

reread:		errno = 0;
		if ((cc = read(STDIN_FILENO, buf, sizeof(buf))) <= 0)
			goto done;
		bp = buf;

rewrite:
		if (rem >= FD_SETSIZE)
			errx(1, "descriptor too big");
		FD_ZERO(&rembits);
		FD_SET(rem, &rembits);
		nfds = rem + 1;
		if (select(nfds, 0, &rembits, 0, 0) < 0) {
			if (errno != EINTR)
				err(1, "select");
			goto rewrite;
		}
		if (!FD_ISSET(rem, &rembits))
			goto rewrite;
		wc = write(rem, bp, cc);
		if (wc < 0) {
			if (errno == EWOULDBLOCK)
				goto rewrite;
			goto done;
		}
		bp += wc;
		cc -= wc;
		if (cc == 0)
			goto reread;
		goto rewrite;
done:
		shutdown(rem, SHUT_WR);
		exit(0);
	}

	tvtimeout.tv_sec = timeout;
	tvtimeout.tv_usec = 0;

	sigsetmask(omask);
	if (rfd2 >= FD_SETSIZE || rem >= FD_SETSIZE)
		errx(1, "descriptor too big");
	FD_ZERO(&readfrom);
	FD_SET(rfd2, &readfrom);
	FD_SET(rem, &readfrom);
	nfds = MAX(rfd2+1, rem+1);
	do {
		ready = readfrom;
		if (timeout) {
			srval = select(nfds, &ready, 0, 0, &tvtimeout);
		} else {
			srval = select(nfds, &ready, 0, 0, 0);
		}

		if (srval < 0) {
			if (errno != EINTR)
				err(1, "select");
			continue;
		}
		if (srval == 0)
			errx(1, "timeout reached (%d seconds)", timeout);
		if (FD_ISSET(rfd2, &ready)) {
			errno = 0;
			cc = read(rfd2, buf, sizeof(buf));
			if (cc <= 0) {
				if (errno != EWOULDBLOCK)
					FD_CLR(rfd2, &readfrom);
			} else
				write(STDERR_FILENO, buf, cc);
		}
		if (FD_ISSET(rem, &ready)) {
			errno = 0;
			cc = read(rem, buf, sizeof(buf));
			if (cc <= 0) {
				if (errno != EWOULDBLOCK)
					FD_CLR(rem, &readfrom);
			} else
				write(STDOUT_FILENO, buf, cc);
		}
	} while (FD_ISSET(rfd2, &readfrom) || FD_ISSET(rem, &readfrom));
}

void
connect_timeout(int sig __unused)
{
	char message[] = "timeout reached before connection completed.\n";

	write(STDERR_FILENO, message, sizeof(message) - 1);
	_exit(1);
}

void
sendsig(int sig)
{
	char signo;

	signo = sig;
	write(rfd2, &signo, 1);
}

char *
copyargs(char * const *argv)
{
	int cc;
	char *args, *p;
	char * const *ap;

	cc = 0;
	for (ap = argv; *ap; ++ap)
		cc += strlen(*ap) + 1;
	if (!(args = malloc((u_int)cc)))
		err(1, NULL);
	for (p = args, ap = argv; *ap; ++ap) {
		strcpy(p, *ap);
		for (p = strcpy(p, *ap); *p; ++p);
		if (ap[1])
			*p++ = ' ';
	}
	return (args);
}

void
usage(void)
{

	fprintf(stderr,
	    "usage: rsh [-46dn] [-l username] [-t timeout] host [command]\n");
	exit(1);
}
Commit	Line	Data
984263bc MD	1	/*-
	2	* Copyright (c) 1983, 1990, 1993, 1994
	3	* The Regents of the University of California. All rights reserved.
d7f0d5a6 PA	4	* Copyright (c) 2002 Networks Associates Technology, Inc.
	5	* All rights reserved.
	6	*
	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.
984263bc MD	11	*
	12	* Redistribution and use in source and binary forms, with or without
	13	* modification, are permitted provided that the following conditions
	14	* are met:
	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.
	27	*
	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
	38	* SUCH DAMAGE.
1de703da	39	*
1de703da	40	* @(#)rsh.c 8.3 (Berkeley) 4/6/94
d7f0d5a6	41	* $FreeBSD: src/usr.bin/rsh/rsh.c,v 1.35 2005/05/21 09:55:07 ru Exp $
e5d03018	42	* $DragonFly: src/usr.bin/rsh/rsh.c,v 1.7 2007/05/18 17:05:12 dillon Exp $
984263bc MD	43	*/
984263bc MD	44
984263bc MD	45	#include <sys/param.h>
	46	#include <sys/signal.h>
	47	#include <sys/socket.h>
	48	#include <sys/ioctl.h>
	49	#include <sys/file.h>
	50	#include <sys/time.h>
	51
	52	#include <netinet/in.h>
	53	#include <netdb.h>
	54
	55	#include <err.h>
	56	#include <errno.h>
	57	#include <libutil.h>
d7f0d5a6	58	#include <paths.h>
984263bc MD	59	#include <pwd.h>
	60	#include <signal.h>
	61	#include <stdio.h>
	62	#include <stdlib.h>
	63	#include <string.h>
	64	#include <unistd.h>
984263bc	65
984263bc MD	66	/*
	67	* rsh - remote shell
	68	*/
	69	int rfd2;
	70
	71	int family = PF_UNSPEC;
d7f0d5a6	72	char rlogin[] = "rlogin";
984263bc	73
2d8a3be7	74	void connect_timeout(int);
d7f0d5a6	75	char copyargs(char const *);
2d8a3be7 EN	76	void sendsig(int);
	77	void talk(int, long, pid_t, int, int);
	78	void usage(void);
984263bc MD	79
984263bc MD	80	int
ac83dddc	81	main(int argc, char **argv)
984263bc	82	{
d7f0d5a6 PA	83	struct passwd const *pw;
d7f0d5a6 PA	84	struct servent const *sp;
984263bc MD	85	long omask;
	86	int argoff, asrsh, ch, dflag, nflag, one, rem;
	87	pid_t pid = 0;
	88	uid_t uid;
	89	char args, host, p, user;
	90	int timeout = 0;
984263bc MD	91
	92	argoff = asrsh = dflag = nflag = 0;
	93	one = 1;
	94	host = user = NULL;
	95
	96	/* if called as something other than "rsh", use it as the host name */
	97	if ((p = strrchr(argv[0], '/')))
	98	++p;
	99	else
	100	p = argv[0];
	101	if (strcmp(p, "rsh"))
	102	host = p;
	103	else
	104	asrsh = 1;
	105
	106	/* handle "rsh host flags" */
	107	if (!host && argc > 2 && argv[1][0] != '-') {
	108	host = argv[1];
	109	argoff = 1;
	110	}
	111
d7f0d5a6	112	#define OPTIONS "468Lde:l:nt:w"
984263bc MD	113	while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
	114	switch(ch) {
	115	case '4':
	116	family = PF_INET;
	117	break;
	118
	119	case '6':
	120	family = PF_INET6;
	121	break;
	122
984263bc MD	123	case 'L': /* -8Lew are ignored to allow rlogin aliases */
	124	case 'e':
	125	case 'w':
	126	case '8':
	127	break;
	128	case 'd':
	129	dflag = 1;
	130	break;
	131	case 'l':
	132	user = optarg;
	133	break;
984263bc MD	134	case 'n':
	135	nflag = 1;
	136	break;
984263bc MD	137	case 't':
	138	timeout = atoi(optarg);
	139	break;
	140	case '?':
	141	default:
	142	usage();
	143	}
	144	optind += argoff;
	145
	146	/* if haven't gotten a host yet, do so */
	147	if (!host && !(host = argv[optind++]))
	148	usage();
	149
	150	/* if no further arguments, must have been called as rlogin. */
	151	if (!argv[optind]) {
	152	if (asrsh)
ac83dddc	153	*argv = rlogin;
984263bc MD	154	execv(_PATH_RLOGIN, argv);
	155	err(1, "can't exec %s", _PATH_RLOGIN);
	156	}
	157
	158	argc -= optind;
	159	argv += optind;
	160
	161	if (!(pw = getpwuid(uid = getuid())))
	162	errx(1, "unknown user id");
	163	if (!user)
	164	user = pw->pw_name;
	165
984263bc MD	166	args = copyargs(argv);
	167
	168	sp = NULL;
984263bc MD	169	if (sp == NULL)
	170	sp = getservbyname("shell", "tcp");
	171	if (sp == NULL)
	172	errx(1, "shell/tcp: unknown service");
	173
984263bc MD	174	if (timeout) {
	175	signal(SIGALRM, connect_timeout);
	176	alarm(timeout);
	177	}
	178	rem = rcmd_af(&host, sp->s_port, pw->pw_name, user, args, &rfd2,
	179	family);
	180	if (timeout) {
	181	signal(SIGALRM, SIG_DFL);
	182	alarm(0);
	183	}
984263bc MD	184
	185	if (rem < 0)
	186	exit(1);
	187
	188	if (rfd2 < 0)
	189	errx(1, "can't establish stderr");
	190	if (dflag) {
	191	if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one,
	192	sizeof(one)) < 0)
	193	warn("setsockopt");
	194	if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one,
	195	sizeof(one)) < 0)
	196	warn("setsockopt");
	197	}
	198
ac83dddc	199	setuid(uid);
984263bc MD	200	omask = sigblock(sigmask(SIGINT)\|sigmask(SIGQUIT)\|sigmask(SIGTERM));
984263bc MD	201	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
ac83dddc	202	signal(SIGINT, sendsig);
984263bc	203	if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
ac83dddc	204	signal(SIGQUIT, sendsig);
984263bc	205	if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
ac83dddc	206	signal(SIGTERM, sendsig);
984263bc MD	207
	208	if (!nflag) {
	209	pid = fork();
	210	if (pid < 0)
	211	err(1, "fork");
	212	}
d7f0d5a6	213	else
e5d03018	214	shutdown(rem, SHUT_WR);
984263bc	215
d7f0d5a6 PA	216	ioctl(rfd2, FIONBIO, &one);
d7f0d5a6 PA	217	ioctl(rem, FIONBIO, &one);
984263bc MD	218
	219	talk(nflag, omask, pid, rem, timeout);
	220
	221	if (!nflag)
ac83dddc	222	kill(pid, SIGKILL);
984263bc MD	223	exit(0);
	224	}
	225
	226	void
ac83dddc	227	talk(int nflag, long omask, pid_t pid, int rem, int timeout)
984263bc MD	228	{
	229	int cc, wc;
	230	fd_set readfrom, ready, rembits;
d7f0d5a6 PA	231	char buf[BUFSIZ];
d7f0d5a6 PA	232	const char *bp;
984263bc MD	233	struct timeval tvtimeout;
	234	int nfds, srval;
	235
	236	if (!nflag && pid == 0) {
ac83dddc	237	close(rfd2);
984263bc MD	238
984263bc MD	239	reread: errno = 0;
ac83dddc	240	if ((cc = read(STDIN_FILENO, buf, sizeof(buf))) <= 0)
984263bc MD	241	goto done;
	242	bp = buf;
	243
	244	rewrite:
	245	if (rem >= FD_SETSIZE)
	246	errx(1, "descriptor too big");
	247	FD_ZERO(&rembits);
	248	FD_SET(rem, &rembits);
	249	nfds = rem + 1;
	250	if (select(nfds, 0, &rembits, 0, 0) < 0) {
	251	if (errno != EINTR)
	252	err(1, "select");
	253	goto rewrite;
	254	}
	255	if (!FD_ISSET(rem, &rembits))
	256	goto rewrite;
d7f0d5a6	257	wc = write(rem, bp, cc);
984263bc MD	258	if (wc < 0) {
	259	if (errno == EWOULDBLOCK)
	260	goto rewrite;
	261	goto done;
	262	}
	263	bp += wc;
	264	cc -= wc;
	265	if (cc == 0)
	266	goto reread;
	267	goto rewrite;
	268	done:
e5d03018	269	shutdown(rem, SHUT_WR);
984263bc MD	270	exit(0);
	271	}
	272
	273	tvtimeout.tv_sec = timeout;
	274	tvtimeout.tv_usec = 0;
	275
ac83dddc	276	sigsetmask(omask);
984263bc MD	277	if (rfd2 >= FD_SETSIZE \|\| rem >= FD_SETSIZE)
	278	errx(1, "descriptor too big");
	279	FD_ZERO(&readfrom);
	280	FD_SET(rfd2, &readfrom);
	281	FD_SET(rem, &readfrom);
	282	nfds = MAX(rfd2+1, rem+1);
	283	do {
	284	ready = readfrom;
	285	if (timeout) {
	286	srval = select(nfds, &ready, 0, 0, &tvtimeout);
	287	} else {
	288	srval = select(nfds, &ready, 0, 0, 0);
	289	}
	290
	291	if (srval < 0) {
	292	if (errno != EINTR)
	293	err(1, "select");
	294	continue;
	295	}
	296	if (srval == 0)
8c79f17c	297	errx(1, "timeout reached (%d seconds)", timeout);
984263bc MD	298	if (FD_ISSET(rfd2, &ready)) {
984263bc MD	299	errno = 0;
d7f0d5a6	300	cc = read(rfd2, buf, sizeof(buf));
984263bc MD	301	if (cc <= 0) {
	302	if (errno != EWOULDBLOCK)
	303	FD_CLR(rfd2, &readfrom);
	304	} else
ac83dddc	305	write(STDERR_FILENO, buf, cc);
984263bc MD	306	}
	307	if (FD_ISSET(rem, &ready)) {
	308	errno = 0;
d7f0d5a6	309	cc = read(rem, buf, sizeof(buf));
984263bc MD	310	if (cc <= 0) {
	311	if (errno != EWOULDBLOCK)
	312	FD_CLR(rem, &readfrom);
	313	} else
ac83dddc	314	write(STDOUT_FILENO, buf, cc);
984263bc MD	315	}
	316	} while (FD_ISSET(rfd2, &readfrom) \|\| FD_ISSET(rem, &readfrom));
	317	}
	318
	319	void
d7f0d5a6	320	connect_timeout(int sig __unused)
984263bc MD	321	{
	322	char message[] = "timeout reached before connection completed.\n";
	323
	324	write(STDERR_FILENO, message, sizeof(message) - 1);
	325	_exit(1);
	326	}
	327
	328	void
ac83dddc	329	sendsig(int sig)
984263bc MD	330	{
	331	char signo;
	332
	333	signo = sig;
d7f0d5a6	334	write(rfd2, &signo, 1);
984263bc MD	335	}
	336
	337	char *
d7f0d5a6	338	copyargs(char * const *argv)
984263bc MD	339	{
984263bc MD	340	int cc;
d7f0d5a6 PA	341	char args, p;
d7f0d5a6 PA	342	char * const *ap;
984263bc MD	343
	344	cc = 0;
	345	for (ap = argv; *ap; ++ap)
	346	cc += strlen(*ap) + 1;
	347	if (!(args = malloc((u_int)cc)))
	348	err(1, NULL);
	349	for (p = args, ap = argv; *ap; ++ap) {
ac83dddc	350	strcpy(p, *ap);
984263bc MD	351	for (p = strcpy(p, ap); p; ++p);
	352	if (ap[1])
	353	*p++ = ' ';
	354	}
	355	return (args);
	356	}
	357
	358	void
ac83dddc	359	usage(void)
984263bc MD	360	{
984263bc MD	361
ac83dddc	362	fprintf(stderr,
d7f0d5a6	363	"usage: rsh [-46dn] [-l username] [-t timeout] host [command]\n");
984263bc MD	364	exit(1);
984263bc MD	365	}