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/* $OpenBSD: lockspool.c,v 1.8 2002/07/03 23:39:03 deraadt Exp $ */
/*
* Copyright (c) 1998 Theo de Raadt <deraadt@theos.com>
* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef lint
static const char rcsid[] = "$OpenBSD: lockspool.c,v 1.8 2002/07/03 23:39:03 deraadt Exp $";
#endif /* not lint */
#include <sys/signal.h>
#include <pwd.h>
#include <syslog.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include "mail.local.h"
void unhold(int);
void usage(void);
extern char *__progname;
int
main(int argc, char *argv[])
{
struct passwd *pw;
char *from, c;
int holdfd;
openlog(__progname, LOG_PERROR, LOG_MAIL);
if (argc != 1 && argc != 2)
usage();
if (argc == 2 && getuid() != 0)
merr(FATAL, "you must be root to lock someone else's spool");
signal(SIGTERM, unhold);
signal(SIGINT, unhold);
signal(SIGHUP, unhold);
signal(SIGPIPE, unhold);
if (argc == 2)
from = argv[1];
else
from = getlogin();
if (from) {
pw = getpwnam(from);
if (pw == NULL)
exit (1);
} else {
pw = getpwuid(getuid());
if (pw)
from = pw->pw_name;
else
exit (1);
}
holdfd = getlock(from, pw);
if (holdfd == -1) {
write(STDOUT_FILENO, "0\n", 2);
exit (1);
}
write(STDOUT_FILENO, "1\n", 2);
while (read(0, &c, 1) == -1 && errno == EINTR)
;
rellock();
exit (0);
}
void
unhold(int signo)
{
rellock();
_exit(0);
}
void
usage(void)
{
merr(FATAL, "usage: %s [username]", __progname);
}
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