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142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
/*-
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* Copyright (c) 1999 Berkeley Software Design, Inc. 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. Berkeley Software Design Inc's name may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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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* From BSDI: daemon.c,v 1.2 1996/08/15 01:11:09 jch Exp
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*/
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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 <err.h>
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#include <errno.h>
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#include <pwd.h>
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#include <libutil.h>
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#include <login_cap.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static void restrict_process(const char *);
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static 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 pidfh *pfh = NULL;
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int ch, nochdir, noclose, errcode;
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const char *pidfile, *user;
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pid_t otherpid;
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nochdir = noclose = 1;
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pidfile = user = NULL;
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while ((ch = getopt(argc, argv, "-cfp:u:")) != -1) {
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switch (ch) {
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case 'c':
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nochdir = 0;
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break;
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case 'f':
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noclose = 0;
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break;
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case 'p':
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pidfile = optarg;
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break;
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case 'u':
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user = optarg;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc == 0)
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usage();
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if (user != NULL)
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restrict_process(user);
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/*
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* Try to open the pidfile before calling daemon(3),
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* to be able to report the error intelligently
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*/
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if (pidfile) {
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pfh = pidfile_open(pidfile, 0600, &otherpid);
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if (pfh == NULL) {
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if (errno == EEXIST) {
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errx(3, "process already running, pid: %d",
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otherpid);
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}
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err(2, "pidfile ``%s''", pidfile);
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}
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}
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if (daemon(nochdir, noclose) == -1)
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err(1, NULL);
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/* Now that we are the child, write out the pid */
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if (pidfile)
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pidfile_write(pfh);
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execvp(argv[0], argv);
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/*
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* execvp() failed -- unlink pidfile if any, and
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* report the error
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*/
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errcode = errno; /* Preserve errcode -- unlink may reset it */
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if (pidfile)
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pidfile_remove(pfh);
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/* The child is now running, so the exit status doesn't matter. */
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errc(1, errcode, "%s", argv[0]);
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}
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static void
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restrict_process(const char *user)
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{
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struct passwd *pw = NULL;
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pw = getpwnam(user);
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if (pw == NULL)
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errx(1, "unknown user: %s", user);
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if (setusercontext(NULL, pw, pw->pw_uid, LOGIN_SETALL) != 0)
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errx(1, "failed to set user environment");
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: daemon [-cf] [-p pidfile] [-u user] command "
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"arguments ...\n");
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exit(1);
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}
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