569 lines
11 KiB
C
Executable File
569 lines
11 KiB
C
Executable File
/*-
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* Copyright (c) 1983, 1990 The Regents of the University of California.
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* 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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char copyright[] =
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"@(#) Copyright (c) 1983, 1990 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)rsh.c 5.24 (Berkeley) 7/1/91";
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#endif /* not lint */
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/*
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* $Source$
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* $Header$
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*/
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#if _MINIX
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#include <sys/types.h>
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#include <sys/ioctl.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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#include <net/netlib.h>
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#include <net/gen/netdb.h>
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void main _ARGS(( int argc, char *argv[] ));
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void usage _ARGS(( void ));
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char *copyargs _ARGS(( char **argv ));
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void sendsig _ARGS(( int signo ));
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void talk _ARGS(( int nflag, long omask, int pid, int rem ));
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#define _PATH_RLOGIN1 "/bin/rlogin"
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#define _PATH_RLOGIN2 "/usr/bin/rlogin"
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typedef unsigned u_int;
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#else
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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>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <varargs.h>
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#include "pathnames.h"
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#endif
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#ifdef KERBEROS
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#include <kerberosIV/des.h>
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#include <kerberosIV/krb.h>
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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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extern int errno;
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int rfd2;
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void
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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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extern char *optarg;
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extern int optind;
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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, pid, rem, uid;
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register char *p;
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char *args, *host, *user;
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#if !_MINIX
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char *copyargs();
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void sendsig();
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#endif
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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 */
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if (p = rindex(argv[0], '/'))
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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
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#define OPTIONS "8KLdek:l:nwx"
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#else
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#define OPTIONS "8KLdek:l:nw"
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#endif
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#else
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#define OPTIONS "8KLdel:nw"
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#endif
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while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != EOF)
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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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des_set_key(cred.session, schedule);
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break;
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#endif
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#endif
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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 */
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if (!host && !(host = argv[optind++]))
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usage();
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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_RLOGIN1, argv);
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execv(_PATH_RLOGIN2, argv);
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(void)fprintf(stderr, "rsh: can't exec rlogin\n");
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exit(1);
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}
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argc -= optind;
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argv += optind;
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if (!(pw = getpwuid(uid = getuid()))) {
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(void)fprintf(stderr, "rsh: unknown user id.\n");
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exit(1);
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}
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if (!user)
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user = pw->pw_name;
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#ifdef KERBEROS
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#ifdef CRYPT
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/* -x turns off -n */
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if (doencrypt)
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nflag = 0;
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#endif
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#endif
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args = copyargs(argv);
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sp = NULL;
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#ifdef KERBEROS
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if (use_kerberos) {
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sp = getservbyname((doencrypt ? "ekshell" : "kshell"), "tcp");
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if (sp == NULL) {
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use_kerberos = 0;
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warning("can't get entry for %s/tcp service",
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doencrypt ? "ekshell" : "kshell");
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}
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}
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#endif
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if (sp == NULL)
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sp = getservbyname("shell", "tcp");
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if (sp == NULL) {
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(void)fprintf(stderr, "rsh: shell/tcp: unknown service.\n");
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exit(1);
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}
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#ifdef KERBEROS
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try_connect:
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if (use_kerberos) {
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rem = KSUCCESS;
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errno = 0;
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if (dest_realm == NULL)
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dest_realm = krb_realmofhost(host);
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#ifdef CRYPT
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if (doencrypt)
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rem = krcmd_mutual(&host, sp->s_port, user, args,
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&rfd2, dest_realm, &cred, schedule);
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else
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#endif
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rem = krcmd(&host, sp->s_port, user, args, &rfd2,
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dest_realm);
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if (rem < 0) {
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use_kerberos = 0;
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sp = getservbyname("shell", "tcp");
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if (sp == NULL) {
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(void)fprintf(stderr,
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"rsh: unknown service shell/tcp.\n");
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exit(1);
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}
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if (errno == ECONNREFUSED)
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warning("remote host doesn't support Kerberos");
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if (errno == ENOENT)
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warning("can't provide Kerberos auth data");
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goto try_connect;
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}
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} else {
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if (doencrypt) {
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(void)fprintf(stderr,
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"rsh: the -x flag requires Kerberos authentication.\n");
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exit(1);
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}
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rem = rcmd(&host, sp->s_port, pw->pw_name, user, args, &rfd2);
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}
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#else
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rem = rcmd(&host, sp->s_port, pw->pw_name, user, args, &rfd2);
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#endif
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if (rem < 0)
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exit(1);
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|
if (rfd2 < 0) {
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|
(void)fprintf(stderr, "rsh: can't establish stderr.\n");
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exit(1);
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}
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#if !_MINIX
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if (dflag) {
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if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one,
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sizeof(one)) < 0)
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(void)fprintf(stderr, "rsh: setsockopt: %s.\n",
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strerror(errno));
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if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one,
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sizeof(one)) < 0)
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(void)fprintf(stderr, "rsh: setsockopt: %s.\n",
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strerror(errno));
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|
}
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#endif
|
|
|
|
(void)setuid(uid);
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|
#if !_MINIX
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|
omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGTERM));
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#endif
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if (signal(SIGINT, SIG_IGN) != SIG_IGN)
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(void)signal(SIGINT, sendsig);
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if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
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(void)signal(SIGQUIT, sendsig);
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if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
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(void)signal(SIGTERM, sendsig);
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|
|
|
if (!nflag) {
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pid = fork();
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|
if (pid < 0) {
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|
(void)fprintf(stderr,
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|
"rsh: fork: %s.\n", strerror(errno));
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exit(1);
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}
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}
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|
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#ifdef KERBEROS
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#ifdef CRYPT
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if (!doencrypt)
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#endif
|
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#endif
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{
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|
#if _MINIX
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;
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#else
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|
(void)ioctl(rfd2, FIONBIO, &one);
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(void)ioctl(rem, FIONBIO, &one);
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|
#endif
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}
|
|
|
|
talk(nflag, omask, pid, rem);
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|
|
|
if (!nflag && pid)
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{
|
|
#if DEBUG
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|
printf("killing %d with %d\n", pid, SIGKILL);
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|
#endif
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|
(void)kill(pid, SIGKILL);
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}
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exit(0);
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}
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|
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void
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talk(nflag, omask, pid, rem)
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int nflag, pid;
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long omask;
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register int rem;
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{
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register int cc, wc;
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register char *bp;
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int readfrom, ready, rembits;
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char buf[BUFSIZ];
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#if _MINIX
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int pid1;
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|
#endif
|
|
|
|
if (!nflag && pid == 0) {
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|
(void)close(rfd2);
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|
|
|
reread: errno = 0;
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if ((cc = read(0, buf, sizeof buf)) <= 0)
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goto done;
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bp = buf;
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|
|
|
rewrite:
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|
#if !_MINIX
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rembits = 1 << rem;
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if (select(16, 0, &rembits, 0, 0) < 0) {
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|
if (errno != EINTR) {
|
|
(void)fprintf(stderr,
|
|
"rsh: select: %s.\n", strerror(errno));
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|
exit(1);
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|
}
|
|
goto rewrite;
|
|
}
|
|
if ((rembits & (1 << rem)) == 0)
|
|
goto rewrite;
|
|
#endif
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|
#ifdef KERBEROS
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|
#ifdef CRYPT
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if (doencrypt)
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wc = des_write(rem, bp, cc);
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else
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|
#endif
|
|
#endif
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|
wc = write(rem, bp, cc);
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|
if (wc < 0) {
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|
#if !_MINIX
|
|
if (errno == EWOULDBLOCK)
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|
goto rewrite;
|
|
#endif
|
|
goto done;
|
|
}
|
|
bp += wc;
|
|
cc -= wc;
|
|
if (cc == 0)
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|
goto reread;
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goto rewrite;
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done:
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|
#if _MINIX
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|
ioctl(rem, NWIOTCPSHUTDOWN, NULL);
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|
#else
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|
(void)shutdown(rem, 1);
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|
#endif
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|
exit(0);
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|
}
|
|
|
|
#if _MINIX
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|
pid1= fork();
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|
if (pid1 == -1)
|
|
{
|
|
(void)fprintf(stderr, "rsh: fork: %s.\n", strerror(errno));
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|
exit(1);
|
|
}
|
|
close (pid1 ? rfd2 : rem);
|
|
for(;;)
|
|
{
|
|
errno = 0;
|
|
cc = read(pid1 ? rem : rfd2, buf, sizeof buf);
|
|
if (cc <= 0)
|
|
{
|
|
if (pid1)
|
|
{
|
|
#if DEBUG
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|
printf("killing %d with %d\n", pid1, SIGKILL);
|
|
#endif
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|
kill(pid1, SIGKILL);
|
|
return;
|
|
}
|
|
exit(0);
|
|
}
|
|
(void)write(pid1 ? 1 : 2, buf, cc);
|
|
}
|
|
#else
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|
(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);
|
|
#endif
|
|
}
|
|
|
|
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;
|
|
#if !_MINIX
|
|
char *malloc();
|
|
#endif
|
|
|
|
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);
|
|
}
|
|
|
|
void
|
|
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);
|
|
}
|