109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/* $OpenBSD: locking.c,v 1.15 2020/05/27 03:12:06 millert Exp $ */
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/*
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* Copyright (c) 1996-1998 Theo de Raadt <deraadt@theos.com>
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* Copyright (c) 1996-1998 David Mazieres <dm@lcs.mit.edu>
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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. The name of the authors may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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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 <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.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 <limits.h>
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#include <errno.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 <stdarg.h>
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#include "pathnames.h"
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#include "mail.local.h"
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static char lpath[PATH_MAX];
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void
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rellock(void)
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{
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if (lpath[0])
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unlink(lpath);
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}
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int
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getlock(const char *name, struct passwd *pw)
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{
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struct stat sb;
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int lfd=-1;
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int tries = 0;
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(void)snprintf(lpath, sizeof lpath, "%s/%s.lock",
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_PATH_MAILDIR, name);
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if (stat(_PATH_MAILDIR, &sb) != -1 &&
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(sb.st_mode & S_IWOTH) == S_IWOTH) {
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mwarn("%s: will not deliver to world-writable spool",
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_PATH_MAILDIR);
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} else {
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/*
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* Only root can write the spool directory.
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*/
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while (1) {
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if ((lfd = open(lpath, O_CREAT|O_WRONLY|O_EXCL,
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S_IRUSR|S_IWUSR)) != -1)
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break;
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if (tries > 9) {
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mwarn("%s: %s", lpath, strerror(errno));
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return(-1);
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}
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sleep(1U << tries);
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tries++;
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}
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}
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return(lfd);
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}
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void
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mwarn(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vsyslog(LOG_ERR, fmt, ap);
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va_end(ap);
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}
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void
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merr(int eval, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vsyslog(LOG_ERR, fmt, ap);
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va_end(ap);
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exit(eval);
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}
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