118 lines
3.0 KiB
C
118 lines
3.0 KiB
C
/* $OpenBSD: lockspool.c,v 1.23 2023/03/08 04:43:05 guenther Exp $ */
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/*
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* Copyright (c) 1998 Theo de Raadt <deraadt@theos.com>
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* Copyright (c) 1998 Todd C. Miller <millert@openbsd.org>
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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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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <signal.h>
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#include <pwd.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <paths.h>
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#include <stdlib.h>
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#include <poll.h>
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#include <err.h>
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#include "mail.local.h"
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void unhold(int);
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void usage(void);
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extern char *__progname;
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int
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main(int argc, char *argv[])
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{
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struct passwd *pw;
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struct pollfd pfd;
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ssize_t nread;
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char *from, c;
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int holdfd;
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if (unveil(_PATH_MAILDIR, "rwc") == -1)
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err(1, "unveil %s", _PATH_MAILDIR);
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if (pledge("stdio rpath wpath getpw cpath fattr", NULL) == -1)
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err(1, "pledge");
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openlog(__progname, LOG_PERROR, LOG_MAIL);
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if (argc != 1 && argc != 2)
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usage();
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if (argc == 2 && getuid() != 0)
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merr(1, "you must be root to lock someone else's spool");
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signal(SIGTERM, unhold);
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signal(SIGINT, unhold);
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signal(SIGHUP, unhold);
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signal(SIGPIPE, unhold);
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if (argc == 2)
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pw = getpwnam(argv[1]);
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else
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pw = getpwuid(getuid());
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if (pw == NULL)
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exit (1);
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from = pw->pw_name;
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holdfd = getlock(from, pw);
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if (holdfd == -1) {
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write(STDOUT_FILENO, "0\n", 2);
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exit (1);
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}
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write(STDOUT_FILENO, "1\n", 2);
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/* wait for the other end of the pipe to close, then release the lock */
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pfd.fd = STDIN_FILENO;
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pfd.events = POLLIN;
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do {
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if (poll(&pfd, 1, INFTIM) == -1) {
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if (errno != EINTR)
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break;
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}
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do {
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nread = read(STDIN_FILENO, &c, 1);
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} while (nread == 1 || (nread == -1 && errno == EINTR));
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} while (nread == -1 && errno == EAGAIN);
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rellock();
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exit (0);
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}
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void
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unhold(int signo)
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{
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rellock();
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_exit(0);
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}
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void
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usage(void)
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{
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merr(1, "usage: %s [username]", __progname);
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}
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