initial import of NetBSD tree

4 files changed, 710 insertions, 0 deletions

diff --git a/usr.bin/rsh/Makefile b/usr.bin/rsh/Makefile
new file mode 100644
index 00000000000..8528f50bed5
--- /dev/null
+++ b/usr.bin/rsh/Makefile
@@ -0,0 +1,10 @@
+#	from: @(#)Makefile	5.6 (Berkeley) 9/27/90
+#	$Id: Makefile,v 1.1 1995/10/18 08:46:03 deraadt Exp $
+
+PROG=	rsh
+SRCS=	rsh.c
+BINOWN=	root
+BINMODE=4555
+.PATH:	${.CURDIR}/../rlogin
+
+.include <bsd.prog.mk>
diff --git a/usr.bin/rsh/pathnames.h b/usr.bin/rsh/pathnames.h
new file mode 100644
index 00000000000..0e2d92d36ce
--- /dev/null
+++ b/usr.bin/rsh/pathnames.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * 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.
+ *
+ *	from: @(#)pathnames.h	5.2 (Berkeley) 4/9/90
+ *	$Id: pathnames.h,v 1.1 1995/10/18 08:46:03 deraadt Exp $
+ */
+
+#define	_PATH_RLOGIN	"/usr/bin/rlogin"
diff --git a/usr.bin/rsh/rsh.1 b/usr.bin/rsh/rsh.1
new file mode 100644
index 00000000000..4e9adce263c
--- /dev/null
+++ b/usr.bin/rsh/rsh.1
@@ -0,0 +1,182 @@
+.\" Copyright (c) 1983, 1990 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" 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.
+.\"
+.\"	from: @(#)rsh.1	6.10 (Berkeley) 7/24/91
+.\"	$Id: rsh.1,v 1.1 1995/10/18 08:46:03 deraadt Exp $
+.\"
+.Dd July 24, 1991
+.Dt RSH 1
+.Os BSD 4.2
+.Sh NAME
+.Nm rsh
+.Nd remote shell
+.Sh SYNOPSIS
+.Nm rsh
+.Op Fl Kdnx
+.Op Fl k Ar realm
+.Op Fl l Ar username
+.Ar host
+.Op command
+.Sh DESCRIPTION
+.Nm Rsh
+executes
+.Ar command
+on
+.Ar host  .
+.Pp
+.Nm Rsh
+copies its standard input to the remote command, the standard
+output of the remote command to its standard output, and the
+standard error of the remote command to its standard error.
+Interrupt, quit and terminate signals are propagated to the remote
+command;
+.Nm rsh
+normally terminates when the remote command does.
+The options are as follows:
+.Bl -tag -width flag
+.It Fl K
+The
+.Fl K
+option turns off all Kerberos authentication.
+.It Fl d
+The
+.Fl d
+option turns on socket debugging (using
+.Xr setsockopt  2  )
+on the
+.Tn TCP
+sockets used for communication with the remote host.
+.It Fl k
+The
+.Fl k
+option causes
+.Nm rsh
+to obtain tickets for the remote host in
+.Ar realm
+instead of the remote host's realm as determined by
+.Xr krb_realmofhost  3  .
+.It Fl l
+By default, the remote username is the same as the local username.
+The
+.Fl l
+option allows the remote name to be specified.
+Kerberos authentication is used, and authorization is determined
+as in
+.Xr rlogin  1  .
+.It Fl n
+The
+.Fl n
+option redirects input from the special device
+.Pa /dev/null
+(see the
+.Sx BUGS
+section of this manual page).
+.It Fl x
+The
+.Fl x
+option turns on
+.Tn DES
+encryption for all data exchange.
+This may introduce a significant delay in response time.
+.El
+.Pp
+If no
+.Ar command
+is specified, you will be logged in on the remote host using
+.Xr rlogin  1  .
+.Pp
+Shell metacharacters which are not quoted are interpreted on local machine,
+while quoted metacharacters are interpreted on the remote machine.
+For example, the command
+.Pp
+.Dl rsh otherhost cat remotefile >> localfile
+.Pp
+appends the remote file
+.Ar remotefile
+to the local file
+.Ar localfile ,
+while
+.Pp
+.Dl rsh otherhost cat remotefile \&">>\&" other_remotefile
+.Pp
+appends
+.Ar remotefile
+to
+.Ar other_remotefile .
+.\" .Pp
+.\" Many sites specify a large number of host names as commands in the
+.\" directory /usr/hosts.
+.\" If this directory is included in your search path, you can use the
+.\" shorthand ``host command'' for the longer form ``rsh host command''.
+.Sh FILES
+.Bl -tag -width /etc/hosts -compact
+.It Pa /etc/hosts
+.El
+.Sh SEE ALSO
+.Xr rlogin 1 ,
+.Xr kerberos 3 ,
+.Xr krb_sendauth 3 ,
+.Xr krb_realmofhost 3
+.Sh HISTORY
+The
+.Nm rsh
+command appeared in
+.Bx 4.2 .
+.Sh BUGS
+If you are using
+.Xr csh  1
+and put a
+.Nm rsh
+in the background without redirecting its input away from the terminal,
+it will block even if no reads are posted by the remote command.
+If no input is desired you should redirect the input of
+.Nm rsh
+to
+.Pa /dev/null
+using the
+.Fl n
+option.
+.Pp
+You cannot run an interactive command
+(like
+.Xr rogue  6
+or
+.Xr vi  1  )
+using
+.Nm rsh  ;
+use
+.Xr rlogin  1
+instead.
+.Pp
+Stop signals stop the local
+.Nm rsh
+process only; this is arguably wrong, but currently hard to fix for reasons
+too complicated to explain here.
diff --git a/usr.bin/rsh/rsh.c b/usr.bin/rsh/rsh.c
new file mode 100644
index 00000000000..ad7ff8e56cd
--- /dev/null
+++ b/usr.bin/rsh/rsh.c
@@ -0,0 +1,481 @@
+/*-
+ * Copyright (c) 1983, 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * 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.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1983, 1990 The Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+/*static char sccsid[] = "from: @(#)rsh.c	5.24 (Berkeley) 7/1/91";*/
+static char rcsid[] = "$Id: rsh.c,v 1.1 1995/10/18 08:46:03 deraadt Exp $";
+#endif /* not lint */
+
+/*
+ * $Source: /cvs/OpenBSD/src/usr.bin/rsh/rsh.c,v $
+ * $Header: /cvs/OpenBSD/src/usr.bin/rsh/rsh.c,v 1.1 1995/10/18 08:46:03 deraadt Exp $
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/file.h>
+
+#include <netinet/in.h>
+#include <netdb.h>
+
+#include <pwd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <varargs.h>
+#include "pathnames.h"
+
+#ifdef KERBEROS
+#include <kerberosIV/des.h>
+#include <kerberosIV/krb.h>
+
+CREDENTIALS cred;
+Key_schedule schedule;
+int use_kerberos = 1, doencrypt;
+char dst_realm_buf[REALM_SZ], *dest_realm;
+extern char *krb_realmofhost();
+#endif
+
+/*
+ * rsh - remote shell
+ */
+extern int errno;
+int rfd2;
+
+main(argc, argv)
+	int argc;
+	char **argv;
+{
+	extern char *optarg;
+	extern int optind;
+	struct passwd *pw;
+	struct servent *sp;
+	long omask;
+	int argoff, asrsh, ch, dflag, nflag, one, pid, rem, uid;
+	register char *p;
+	char *args, *host, *user, *copyargs();
+	void sendsig();
+
+	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 = rindex(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;
+	}
+
+#ifdef KERBEROS
+#ifdef CRYPT
+#define	OPTIONS	"8KLdek:l:nwx"
+#else
+#define	OPTIONS	"8KLdek:l:nw"
+#endif
+#else
+#define	OPTIONS	"8KLdel:nw"
+#endif
+	while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != EOF)
+		switch(ch) {
+		case 'K':
+#ifdef KERBEROS
+			use_kerberos = 0;
+#endif
+			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;
+#ifdef KERBEROS
+		case 'k':
+			dest_realm = dst_realm_buf;
+			strncpy(dest_realm, optarg, REALM_SZ);
+			break;
+#endif
+		case 'n':
+			nflag = 1;
+			break;
+#ifdef KERBEROS
+#ifdef CRYPT
+		case 'x':
+			doencrypt = 1;
+			des_set_key(cred.session, schedule);
+			break;
+#endif
+#endif
+		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);
+		(void)fprintf(stderr, "rsh: can't exec %s.\n", _PATH_RLOGIN);
+		exit(1);
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (!(pw = getpwuid(uid = getuid()))) {
+		(void)fprintf(stderr, "rsh: unknown user id.\n");
+		exit(1);
+	}
+	if (!user)
+		user = pw->pw_name;
+
+#ifdef KERBEROS
+#ifdef CRYPT
+	/* -x turns off -n */
+	if (doencrypt)
+		nflag = 0;
+#endif
+#endif
+
+	args = copyargs(argv);
+
+	sp = NULL;
+#ifdef KERBEROS
+	if (use_kerberos) {
+		sp = getservbyname((doencrypt ? "ekshell" : "kshell"), "tcp");
+		if (sp == NULL) {
+			use_kerberos = 0;
+			warning("can't get entry for %s/tcp service",
+			    doencrypt ? "ekshell" : "kshell");
+		}
+	}
+#endif
+	if (sp == NULL)
+		sp = getservbyname("shell", "tcp");
+	if (sp == NULL) {
+		(void)fprintf(stderr, "rsh: shell/tcp: unknown service.\n");
+		exit(1);
+	}
+
+#ifdef KERBEROS
+try_connect:
+	if (use_kerberos) {
+		rem = KSUCCESS;
+		errno = 0;
+		if (dest_realm == NULL)
+			dest_realm = krb_realmofhost(host);
+
+#ifdef CRYPT
+		if (doencrypt)
+			rem = krcmd_mutual(&host, sp->s_port, user, args,
+			    &rfd2, dest_realm, &cred, schedule);
+		else
+#endif
+			rem = krcmd(&host, sp->s_port, user, args, &rfd2,
+			    dest_realm);
+		if (rem < 0) {
+			use_kerberos = 0;
+			sp = getservbyname("shell", "tcp");
+			if (sp == NULL) {
+				(void)fprintf(stderr,
+				    "rsh: unknown service shell/tcp.\n");
+				exit(1);
+			}
+			if (errno == ECONNREFUSED)
+				warning("remote host doesn't support Kerberos");
+			if (errno == ENOENT)
+				warning("can't provide Kerberos auth data");
+			goto try_connect;
+		}
+	} else {
+		if (doencrypt) {
+			(void)fprintf(stderr,
+			    "rsh: the -x flag requires Kerberos authentication.\n");
+			exit(1);
+		}
+		rem = rcmd(&host, sp->s_port, pw->pw_name, user, args, &rfd2);
+	}
+#else
+	rem = rcmd(&host, sp->s_port, pw->pw_name, user, args, &rfd2);
+#endif
+
+	if (rem < 0)
+		exit(1);
+
+	if (rfd2 < 0) {
+		(void)fprintf(stderr, "rsh: can't establish stderr.\n");
+		exit(1);
+	}
+	if (dflag) {
+		if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one,
+		    sizeof(one)) < 0)
+			(void)fprintf(stderr, "rsh: setsockopt: %s.\n",
+			    strerror(errno));
+		if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one,
+		    sizeof(one)) < 0)
+			(void)fprintf(stderr, "rsh: setsockopt: %s.\n",
+			    strerror(errno));
+	}
+
+	(void)setuid(uid);
+	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGTERM));
+	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
+		(void)signal(SIGINT, sendsig);
+	if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
+		(void)signal(SIGQUIT, sendsig);
+	if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
+		(void)signal(SIGTERM, sendsig);
+
+	if (!nflag) {
+		pid = fork();
+		if (pid < 0) {
+			(void)fprintf(stderr,
+			    "rsh: fork: %s.\n", strerror(errno));
+			exit(1);
+		}
+	}
+
+#ifdef KERBEROS
+#ifdef CRYPT
+	if (!doencrypt)
+#endif
+#endif
+	{
+		(void)ioctl(rfd2, FIONBIO, &one);
+		(void)ioctl(rem, FIONBIO, &one);
+	}
+
+	talk(nflag, omask, pid, rem);
+
+	if (!nflag)
+		(void)kill(pid, SIGKILL);
+	exit(0);
+}
+
+talk(nflag, omask, pid, rem)
+	int nflag, pid;
+	long omask;
+	register int rem;
+{
+	register int cc, wc;
+	register char *bp;
+	int readfrom, ready, rembits;
+	char buf[BUFSIZ];
+
+	if (!nflag && pid == 0) {
+		(void)close(rfd2);
+
+reread:		errno = 0;
+		if ((cc = read(0, buf, sizeof buf)) <= 0)
+			goto done;
+		bp = buf;
+
+rewrite:	rembits = 1 << rem;
+		if (select(16, 0, &rembits, 0, 0) < 0) {
+			if (errno != EINTR) {
+				(void)fprintf(stderr,
+				    "rsh: select: %s.\n", strerror(errno));
+				exit(1);
+			}
+			goto rewrite;
+		}
+		if ((rembits & (1 << rem)) == 0)
+			goto rewrite;
+#ifdef KERBEROS
+#ifdef CRYPT
+		if (doencrypt)
+			wc = des_write(rem, bp, cc);
+		else
+#endif
+#endif
+			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:
+		(void)shutdown(rem, 1);
+		exit(0);
+	}
+
+	(void)sigsetmask(omask);
+	readfrom = (1 << rfd2) | (1 << rem);
+	do {
+		ready = readfrom;
+		if (select(16, &ready, 0, 0, 0) < 0) {
+			if (errno != EINTR) {
+				(void)fprintf(stderr,
+				    "rsh: select: %s.\n", strerror(errno));
+				exit(1);
+			}
+			continue;
+		}
+		if (ready & (1 << rfd2)) {
+			errno = 0;
+#ifdef KERBEROS
+#ifdef CRYPT
+			if (doencrypt)
+				cc = des_read(rfd2, buf, sizeof buf);
+			else
+#endif
+#endif
+				cc = read(rfd2, buf, sizeof buf);
+			if (cc <= 0) {
+				if (errno != EWOULDBLOCK)
+					readfrom &= ~(1 << rfd2);
+			} else
+				(void)write(2, buf, cc);
+		}
+		if (ready & (1 << rem)) {
+			errno = 0;
+#ifdef KERBEROS
+#ifdef CRYPT
+			if (doencrypt)
+				cc = des_read(rem, buf, sizeof buf);
+			else
+#endif
+#endif
+				cc = read(rem, buf, sizeof buf);
+			if (cc <= 0) {
+				if (errno != EWOULDBLOCK)
+					readfrom &= ~(1 << rem);
+			} else
+				(void)write(1, buf, cc);
+		}
+	} while (readfrom);
+}
+
+void
+sendsig(signo)
+	char signo;
+{
+#ifdef KERBEROS
+#ifdef CRYPT
+	if (doencrypt)
+		(void)des_write(rfd2, &signo, 1);
+	else
+#endif
+#endif
+		(void)write(rfd2, &signo, 1);
+}
+
+#ifdef KERBEROS
+/* VARARGS */
+warning(va_alist)
+va_dcl
+{
+	va_list ap;
+	char *fmt;
+
+	(void)fprintf(stderr, "rsh: warning, using standard rsh: ");
+	va_start(ap);
+	fmt = va_arg(ap, char *);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	(void)fprintf(stderr, ".\n");
+}
+#endif
+
+char *
+copyargs(argv)
+	char **argv;
+{
+	register int cc;
+	register char **ap, *p;
+	char *args, *malloc();
+
+	cc = 0;
+	for (ap = argv; *ap; ++ap)
+		cc += strlen(*ap) + 1;
+	if (!(args = malloc((u_int)cc))) {
+		(void)fprintf(stderr, "rsh: %s.\n", strerror(ENOMEM));
+		exit(1);
+	}
+	for (p = args, ap = argv; *ap; ++ap) {
+		(void)strcpy(p, *ap);
+		for (p = strcpy(p, *ap); *p; ++p);
+		if (ap[1])
+			*p++ = ' ';
+	}
+	return(args);
+}
+
+usage()
+{
+	(void)fprintf(stderr,
+	    "usage: rsh [-nd%s]%s[-l login] host [command]\n",
+#ifdef KERBEROS
+#ifdef CRYPT
+	    "x", " [-k realm] ");
+#else
+	    "", " [-k realm] ");
+#endif
+#else
+	    "", " ");
+#endif
+	exit(1);
+}