376 lines
8.4 KiB
C
376 lines
8.4 KiB
C
/*-
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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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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* Portions of this software were developed for the FreeBSD Project by
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* ThinkSec AS and NAI Labs, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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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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static const char copyright[] =
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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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static const char sccsid[] = "From: @(#)rsh.c 8.3 (Berkeley) 4/6/94";
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.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 <sys/time.h>
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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 <libutil.h>
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#include <paths.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 <err.h>
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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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int family = PF_UNSPEC;
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char rlogin[] = "rlogin";
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void connect_timeout(int);
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char *copyargs(char * const *);
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void sendsig(int);
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void talk(int, long, pid_t, int, int);
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void usage(void);
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int
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main(int argc, char *argv[])
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{
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struct passwd const *pw;
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struct servent const *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 = 0;
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uid_t uid;
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char *args, *host, *p, *user;
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int timeout = 0;
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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 = strrchr(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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#define OPTIONS "468KLde:l:nt:w"
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while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
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switch(ch) {
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case '4':
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family = PF_INET;
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break;
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case '6':
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family = PF_INET6;
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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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case 'n':
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nflag = 1;
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break;
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case 't':
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timeout = atoi(optarg);
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break;
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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_RLOGIN, argv);
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err(1, "can't exec %s", _PATH_RLOGIN);
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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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errx(1, "unknown user id");
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if (!user)
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user = pw->pw_name;
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args = copyargs(argv);
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sp = NULL;
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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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errx(1, "shell/tcp: unknown service");
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if (timeout) {
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signal(SIGALRM, connect_timeout);
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alarm(timeout);
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}
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rem = rcmd_af(&host, sp->s_port, pw->pw_name, user, args, &rfd2,
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family);
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if (timeout) {
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signal(SIGALRM, SIG_DFL);
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alarm(0);
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}
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if (rem < 0)
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exit(1);
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if (rfd2 < 0)
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errx(1, "can't establish stderr");
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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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warn("setsockopt");
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if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one,
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sizeof(one)) < 0)
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warn("setsockopt");
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}
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(void)setuid(uid);
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omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGTERM));
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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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err(1, "fork");
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}
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else
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(void)shutdown(rem, 1);
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(void)ioctl(rfd2, FIONBIO, &one);
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(void)ioctl(rem, FIONBIO, &one);
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talk(nflag, omask, pid, rem, timeout);
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if (!nflag)
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(void)kill(pid, SIGKILL);
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exit(0);
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}
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void
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talk(int nflag, long omask, pid_t pid, int rem, int timeout)
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{
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int cc, wc;
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fd_set readfrom, ready, rembits;
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char buf[BUFSIZ];
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const char *bp;
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struct timeval tvtimeout;
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int nfds, srval;
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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 (rem >= FD_SETSIZE)
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errx(1, "descriptor too big");
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FD_ZERO(&rembits);
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FD_SET(rem, &rembits);
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nfds = rem + 1;
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if (select(nfds, 0, &rembits, 0, 0) < 0) {
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if (errno != EINTR)
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err(1, "select");
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goto rewrite;
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}
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if (!FD_ISSET(rem, &rembits))
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goto rewrite;
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wc = write(rem, bp, cc);
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if (wc < 0) {
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if (errno == EWOULDBLOCK)
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goto rewrite;
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goto done;
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}
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bp += wc;
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cc -= wc;
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if (cc == 0)
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goto reread;
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goto rewrite;
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done:
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(void)shutdown(rem, 1);
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exit(0);
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}
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tvtimeout.tv_sec = timeout;
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tvtimeout.tv_usec = 0;
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(void)sigsetmask(omask);
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if (rfd2 >= FD_SETSIZE || rem >= FD_SETSIZE)
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errx(1, "descriptor too big");
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FD_ZERO(&readfrom);
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FD_SET(rfd2, &readfrom);
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FD_SET(rem, &readfrom);
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nfds = MAX(rfd2+1, rem+1);
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do {
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ready = readfrom;
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if (timeout) {
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srval = select(nfds, &ready, 0, 0, &tvtimeout);
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} else {
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srval = select(nfds, &ready, 0, 0, 0);
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}
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if (srval < 0) {
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if (errno != EINTR)
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err(1, "select");
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continue;
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}
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if (srval == 0)
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errx(1, "timeout reached (%d seconds)\n", timeout);
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if (FD_ISSET(rfd2, &ready)) {
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errno = 0;
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cc = read(rfd2, buf, sizeof buf);
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if (cc <= 0) {
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if (errno != EWOULDBLOCK)
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FD_CLR(rfd2, &readfrom);
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} else
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(void)write(STDERR_FILENO, buf, cc);
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}
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if (FD_ISSET(rem, &ready)) {
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errno = 0;
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cc = read(rem, buf, sizeof buf);
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if (cc <= 0) {
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if (errno != EWOULDBLOCK)
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FD_CLR(rem, &readfrom);
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} else
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(void)write(STDOUT_FILENO, buf, cc);
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}
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} while (FD_ISSET(rfd2, &readfrom) || FD_ISSET(rem, &readfrom));
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}
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void
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connect_timeout(int sig)
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{
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char message[] = "timeout reached before connection completed.\n";
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write(STDERR_FILENO, message, sizeof(message) - 1);
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_exit(1);
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}
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void
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sendsig(int sig)
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{
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char signo;
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signo = sig;
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(void)write(rfd2, &signo, 1);
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}
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char *
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copyargs(char * const *argv)
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{
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int cc;
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char *args, *p;
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char * const *ap;
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cc = 0;
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for (ap = argv; *ap; ++ap)
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cc += strlen(*ap) + 1;
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if (!(args = malloc((u_int)cc)))
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err(1, NULL);
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for (p = args, ap = argv; *ap; ++ap) {
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(void)strcpy(p, *ap);
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for (p = strcpy(p, *ap); *p; ++p);
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if (ap[1])
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*p++ = ' ';
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}
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return (args);
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}
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void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: rsh [-46] [-nd] [-l login] [-t timeout] host [command]\n");
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exit(1);
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}
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