1994-05-27 12:33:43 +00:00
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/*-
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* Copyright (c) 1983, 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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1997-08-07 06:46:45 +00:00
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static const char copyright[] =
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1994-05-27 12:33:43 +00:00
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"@(#) Copyright (c) 1983, 1990, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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1997-08-07 06:46:45 +00:00
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#if 0
|
1995-01-14 20:36:22 +00:00
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static char sccsid[] = "From: @(#)rsh.c 8.3 (Berkeley) 4/6/94";
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1997-08-07 06:46:45 +00:00
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#endif
|
1995-01-14 20:36:22 +00:00
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static char rcsid[] =
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1997-09-28 08:57:24 +00:00
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"$Id$";
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1994-05-27 12:33:43 +00:00
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/signal.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/file.h>
|
1996-09-06 05:24:05 +00:00
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#include <sys/time.h>
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1994-05-27 12:33:43 +00:00
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#include <netinet/in.h>
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#include <netdb.h>
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#include <err.h>
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#include <errno.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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1997-09-28 08:57:24 +00:00
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#include <err.h>
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1994-05-27 12:33:43 +00:00
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#include "pathnames.h"
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#ifdef KERBEROS
|
1996-02-11 09:18:18 +00:00
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#include <des.h>
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1997-09-28 08:57:24 +00:00
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#include <krb.h>
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#include "krb.h"
|
1994-05-27 12:33:43 +00:00
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CREDENTIALS cred;
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Key_schedule schedule;
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int use_kerberos = 1, doencrypt;
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char dst_realm_buf[REALM_SZ], *dest_realm;
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extern char *krb_realmofhost();
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#endif
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/*
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* rsh - remote shell
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*/
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int rfd2;
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char *copyargs __P((char **));
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void sendsig __P((int));
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1996-09-06 05:24:05 +00:00
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void talk __P((int, long, pid_t, int, int));
|
1994-05-27 12:33:43 +00:00
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void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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struct passwd *pw;
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struct servent *sp;
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long omask;
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int argoff, asrsh, ch, dflag, nflag, one, rem;
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pid_t pid;
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uid_t uid;
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char *args, *host, *p, *user;
|
1996-09-06 05:24:05 +00:00
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int timeout = 0;
|
1994-05-27 12:33:43 +00:00
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argoff = asrsh = dflag = nflag = 0;
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one = 1;
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host = user = NULL;
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/* if called as something other than "rsh", use it as the host name */
|
1997-09-28 08:57:24 +00:00
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if ((p = strrchr(argv[0], '/')))
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1994-05-27 12:33:43 +00:00
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++p;
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else
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p = argv[0];
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if (strcmp(p, "rsh"))
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host = p;
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else
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asrsh = 1;
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/* handle "rsh host flags" */
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if (!host && argc > 2 && argv[1][0] != '-') {
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host = argv[1];
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argoff = 1;
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}
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#ifdef KERBEROS
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#ifdef CRYPT
|
1996-09-06 05:24:05 +00:00
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|
#define OPTIONS "8KLde:k:l:nt:wx"
|
1994-05-27 12:33:43 +00:00
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|
#else
|
1996-09-06 05:24:05 +00:00
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|
#define OPTIONS "8KLde:k:l:nt:w"
|
1994-05-27 12:33:43 +00:00
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|
#endif
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|
#else
|
1996-09-06 05:24:05 +00:00
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|
#define OPTIONS "8KLde:l:nt:w"
|
1994-05-27 12:33:43 +00:00
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|
|
#endif
|
1997-03-29 04:34:07 +00:00
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|
while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
|
1994-05-27 12:33:43 +00:00
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|
switch(ch) {
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|
case 'K':
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|
#ifdef KERBEROS
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use_kerberos = 0;
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|
#endif
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|
break;
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|
|
case 'L': /* -8Lew are ignored to allow rlogin aliases */
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|
case 'e':
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|
case 'w':
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|
case '8':
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break;
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|
case 'd':
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dflag = 1;
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break;
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case 'l':
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user = optarg;
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break;
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#ifdef KERBEROS
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case 'k':
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|
dest_realm = dst_realm_buf;
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|
strncpy(dest_realm, optarg, REALM_SZ);
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|
break;
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|
#endif
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case 'n':
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|
nflag = 1;
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|
break;
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|
#ifdef KERBEROS
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|
#ifdef CRYPT
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|
case 'x':
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|
doencrypt = 1;
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|
break;
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#endif
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|
#endif
|
1996-09-06 05:24:05 +00:00
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|
case 't':
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|
timeout = atoi(optarg);
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|
break;
|
1994-05-27 12:33:43 +00:00
|
|
|
case '?':
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|
default:
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|
|
usage();
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|
|
}
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|
optind += argoff;
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|
|
/* if haven't gotten a host yet, do so */
|
|
|
|
if (!host && !(host = argv[optind++]))
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|
usage();
|
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|
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|
|
/* if no further arguments, must have been called as rlogin. */
|
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|
|
if (!argv[optind]) {
|
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|
|
if (asrsh)
|
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|
|
*argv = "rlogin";
|
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|
|
execv(_PATH_RLOGIN, argv);
|
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|
|
err(1, "can't exec %s", _PATH_RLOGIN);
|
|
|
|
}
|
|
|
|
|
|
|
|
argc -= optind;
|
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|
|
argv += optind;
|
|
|
|
|
|
|
|
if (!(pw = getpwuid(uid = getuid())))
|
|
|
|
errx(1, "unknown user id");
|
|
|
|
if (!user)
|
|
|
|
user = pw->pw_name;
|
|
|
|
|
|
|
|
#ifdef KERBEROS
|
|
|
|
#ifdef CRYPT
|
|
|
|
/* -x turns off -n */
|
|
|
|
if (doencrypt)
|
|
|
|
nflag = 0;
|
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|
|
#endif
|
|
|
|
#endif
|
|
|
|
|
|
|
|
args = copyargs(argv);
|
|
|
|
|
|
|
|
sp = NULL;
|
|
|
|
#ifdef KERBEROS
|
|
|
|
if (use_kerberos) {
|
|
|
|
sp = getservbyname((doencrypt ? "ekshell" : "kshell"), "tcp");
|
|
|
|
if (sp == NULL) {
|
|
|
|
use_kerberos = 0;
|
1997-08-07 06:46:45 +00:00
|
|
|
warnx(
|
|
|
|
"warning, using standard rsh: can't get entry for %s/tcp service",
|
1994-05-27 12:33:43 +00:00
|
|
|
doencrypt ? "ekshell" : "kshell");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (sp == NULL)
|
|
|
|
sp = getservbyname("shell", "tcp");
|
|
|
|
if (sp == NULL)
|
|
|
|
errx(1, "shell/tcp: unknown service");
|
|
|
|
|
|
|
|
#ifdef KERBEROS
|
|
|
|
try_connect:
|
|
|
|
if (use_kerberos) {
|
|
|
|
struct hostent *hp;
|
|
|
|
|
|
|
|
/* fully qualify hostname (needed for krb_realmofhost) */
|
|
|
|
hp = gethostbyname(host);
|
|
|
|
if (hp != NULL && !(host = strdup(hp->h_name)))
|
|
|
|
err(1, NULL);
|
|
|
|
|
|
|
|
rem = KSUCCESS;
|
|
|
|
errno = 0;
|
|
|
|
if (dest_realm == NULL)
|
|
|
|
dest_realm = krb_realmofhost(host);
|
|
|
|
|
|
|
|
#ifdef CRYPT
|
1994-09-26 09:22:08 +00:00
|
|
|
if (doencrypt) {
|
1994-05-27 12:33:43 +00:00
|
|
|
rem = krcmd_mutual(&host, sp->s_port, user, args,
|
|
|
|
&rfd2, dest_realm, &cred, schedule);
|
1997-09-28 08:57:24 +00:00
|
|
|
des_set_key(&cred.session, schedule);
|
1994-09-26 09:22:08 +00:00
|
|
|
} else
|
1994-05-27 12:33:43 +00:00
|
|
|
#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)
|
|
|
|
errx(1, "shell/tcp: unknown service");
|
|
|
|
if (errno == ECONNREFUSED)
|
1997-08-07 06:46:45 +00:00
|
|
|
warnx(
|
|
|
|
"warning, using standard rsh: remote host doesn't support Kerberos");
|
1994-05-27 12:33:43 +00:00
|
|
|
if (errno == ENOENT)
|
1997-08-07 06:46:45 +00:00
|
|
|
warnx(
|
|
|
|
"warning, using standard rsh: can't provide Kerberos auth data");
|
1994-05-27 12:33:43 +00:00
|
|
|
goto try_connect;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if (doencrypt)
|
|
|
|
errx(1, "the -x flag requires Kerberos authentication");
|
|
|
|
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)
|
|
|
|
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");
|
|
|
|
}
|
|
|
|
|
|
|
|
(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)
|
|
|
|
err(1, "fork");
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef KERBEROS
|
|
|
|
#ifdef CRYPT
|
|
|
|
if (!doencrypt)
|
|
|
|
#endif
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
(void)ioctl(rfd2, FIONBIO, &one);
|
|
|
|
(void)ioctl(rem, FIONBIO, &one);
|
|
|
|
}
|
|
|
|
|
1996-09-06 05:24:05 +00:00
|
|
|
talk(nflag, omask, pid, rem, timeout);
|
1994-05-27 12:33:43 +00:00
|
|
|
|
|
|
|
if (!nflag)
|
|
|
|
(void)kill(pid, SIGKILL);
|
|
|
|
exit(0);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
1996-09-06 05:24:05 +00:00
|
|
|
talk(nflag, omask, pid, rem, timeout)
|
1994-05-27 12:33:43 +00:00
|
|
|
int nflag;
|
|
|
|
long omask;
|
|
|
|
pid_t pid;
|
|
|
|
int rem;
|
|
|
|
{
|
|
|
|
int cc, wc;
|
|
|
|
fd_set readfrom, ready, rembits;
|
|
|
|
char *bp, buf[BUFSIZ];
|
1996-09-06 05:24:05 +00:00
|
|
|
struct timeval tvtimeout;
|
|
|
|
int srval;
|
1994-05-27 12:33:43 +00:00
|
|
|
|
|
|
|
if (!nflag && pid == 0) {
|
|
|
|
(void)close(rfd2);
|
|
|
|
|
|
|
|
reread: errno = 0;
|
|
|
|
if ((cc = read(0, buf, sizeof buf)) <= 0)
|
|
|
|
goto done;
|
|
|
|
bp = buf;
|
|
|
|
|
1995-05-30 06:41:30 +00:00
|
|
|
rewrite:
|
1994-05-27 12:33:43 +00:00
|
|
|
FD_ZERO(&rembits);
|
|
|
|
FD_SET(rem, &rembits);
|
|
|
|
if (select(16, 0, &rembits, 0, 0) < 0) {
|
|
|
|
if (errno != EINTR)
|
|
|
|
err(1, "select");
|
|
|
|
goto rewrite;
|
|
|
|
}
|
|
|
|
if (!FD_ISSET(rem, &rembits))
|
|
|
|
goto rewrite;
|
|
|
|
#ifdef KERBEROS
|
|
|
|
#ifdef CRYPT
|
|
|
|
if (doencrypt)
|
1997-09-28 08:57:24 +00:00
|
|
|
wc = des_enc_write(rem, bp, cc, schedule, &cred.session);
|
1994-05-27 12:33:43 +00:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
1996-09-06 05:24:05 +00:00
|
|
|
tvtimeout.tv_sec = timeout;
|
|
|
|
tvtimeout.tv_usec = 0;
|
|
|
|
|
1994-05-27 12:33:43 +00:00
|
|
|
(void)sigsetmask(omask);
|
|
|
|
FD_ZERO(&readfrom);
|
|
|
|
FD_SET(rfd2, &readfrom);
|
|
|
|
FD_SET(rem, &readfrom);
|
|
|
|
do {
|
|
|
|
ready = readfrom;
|
1996-09-06 05:24:05 +00:00
|
|
|
if (timeout) {
|
|
|
|
srval = select(16, &ready, 0, 0, &tvtimeout);
|
|
|
|
} else {
|
|
|
|
srval = select(16, &ready, 0, 0, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (srval < 0) {
|
1994-05-27 12:33:43 +00:00
|
|
|
if (errno != EINTR)
|
|
|
|
err(1, "select");
|
|
|
|
continue;
|
|
|
|
}
|
1996-09-06 05:24:05 +00:00
|
|
|
if (srval == 0)
|
|
|
|
errx(1, "timeout reached (%d seconds)\n", timeout);
|
1994-05-27 12:33:43 +00:00
|
|
|
if (FD_ISSET(rfd2, &ready)) {
|
|
|
|
errno = 0;
|
|
|
|
#ifdef KERBEROS
|
|
|
|
#ifdef CRYPT
|
|
|
|
if (doencrypt)
|
1997-09-28 08:57:24 +00:00
|
|
|
cc = des_enc_read(rfd2, buf, sizeof buf, schedule, &cred.session);
|
1994-05-27 12:33:43 +00:00
|
|
|
else
|
|
|
|
#endif
|
|
|
|
#endif
|
|
|
|
cc = read(rfd2, buf, sizeof buf);
|
|
|
|
if (cc <= 0) {
|
|
|
|
if (errno != EWOULDBLOCK)
|
|
|
|
FD_CLR(rfd2, &readfrom);
|
|
|
|
} else
|
|
|
|
(void)write(2, buf, cc);
|
|
|
|
}
|
|
|
|
if (FD_ISSET(rem, &ready)) {
|
|
|
|
errno = 0;
|
|
|
|
#ifdef KERBEROS
|
|
|
|
#ifdef CRYPT
|
|
|
|
if (doencrypt)
|
1997-09-28 08:57:24 +00:00
|
|
|
cc = des_enc_read(rem, buf, sizeof buf, schedule, &cred.session);
|
1994-05-27 12:33:43 +00:00
|
|
|
else
|
|
|
|
#endif
|
|
|
|
#endif
|
|
|
|
cc = read(rem, buf, sizeof buf);
|
|
|
|
if (cc <= 0) {
|
|
|
|
if (errno != EWOULDBLOCK)
|
|
|
|
FD_CLR(rem, &readfrom);
|
|
|
|
} else
|
|
|
|
(void)write(1, buf, cc);
|
|
|
|
}
|
|
|
|
} while (FD_ISSET(rfd2, &readfrom) || FD_ISSET(rem, &readfrom));
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
sendsig(sig)
|
|
|
|
int sig;
|
|
|
|
{
|
|
|
|
char signo;
|
|
|
|
|
|
|
|
signo = sig;
|
|
|
|
#ifdef KERBEROS
|
|
|
|
#ifdef CRYPT
|
|
|
|
if (doencrypt)
|
1997-09-28 08:57:24 +00:00
|
|
|
(void)des_enc_write(rfd2, &signo, 1, schedule, &cred.session);
|
1994-05-27 12:33:43 +00:00
|
|
|
else
|
|
|
|
#endif
|
|
|
|
#endif
|
|
|
|
(void)write(rfd2, &signo, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
char *
|
|
|
|
copyargs(argv)
|
|
|
|
char **argv;
|
|
|
|
{
|
|
|
|
int cc;
|
|
|
|
char **ap, *args, *p;
|
|
|
|
|
|
|
|
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) {
|
|
|
|
(void)strcpy(p, *ap);
|
|
|
|
for (p = strcpy(p, *ap); *p; ++p);
|
|
|
|
if (ap[1])
|
|
|
|
*p++ = ' ';
|
|
|
|
}
|
|
|
|
return (args);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
usage()
|
|
|
|
{
|
|
|
|
|
|
|
|
(void)fprintf(stderr,
|
1996-09-06 05:24:05 +00:00
|
|
|
"usage: rsh [-nd%s]%s[-l login] [-t timeout] host [command]\n",
|
1994-05-27 12:33:43 +00:00
|
|
|
#ifdef KERBEROS
|
|
|
|
#ifdef CRYPT
|
|
|
|
"x", " [-k realm] ");
|
|
|
|
#else
|
|
|
|
"", " [-k realm] ");
|
|
|
|
#endif
|
|
|
|
#else
|
|
|
|
"", " ");
|
|
|
|
#endif
|
|
|
|
exit(1);
|
|
|
|
}
|
1995-01-14 20:36:22 +00:00
|
|
|
|