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      1 /*	$NetBSD: dbfile.c,v 1.2 2018/01/04 20:57:29 kamil Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #if HAVE_NBTOOL_CONFIG_H
     30 #include "nbtool_config.h"
     31 #endif
     32 
     33 #include <sys/cdefs.h>
     34 __RCSID("$NetBSD: dbfile.c,v 1.2 2018/01/04 20:57:29 kamil Exp $");
     35 
     36 #include "namespace.h"
     37 
     38 #include <sys/stat.h>
     39 #include <stdio.h>
     40 #include <fcntl.h>
     41 #include <signal.h>
     42 #include <unistd.h>
     43 #include <stdlib.h>
     44 #include <errno.h>
     45 #include <paths.h>
     46 #include <db.h>
     47 
     48 int
     49 __dbopen(const char *file, int flags, mode_t mode, struct stat *sb)
     50 {
     51 	int fd;
     52 	int serrno;
     53 
     54 #ifndef O_CLOEXEC
     55 #define O_CLOEXEC 0
     56 #endif
     57 
     58 	if ((fd = open(file, flags | O_CLOEXEC, mode)) == -1)
     59 		return -1;
     60 
     61 #if O_CLOEXEC == 0
     62 	if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
     63 		goto out;
     64 #endif
     65 
     66 	if (sb && fstat(fd, sb) == -1)
     67 		goto out;
     68 
     69 	return fd;
     70 out:
     71 	serrno = errno;
     72 	close(fd);
     73 	errno = serrno;
     74 	return -1;
     75 
     76 }
     77 
     78 int
     79 __dbtemp(const char *prefix, struct stat *sb)
     80 {
     81 	sigset_t set, oset;
     82 	int len;
     83 	int fd, serrno;
     84 	char *envtmp;
     85 	char path[PATH_MAX];
     86 
     87 	if (issetugid())
     88 		envtmp = NULL;
     89 	else
     90 		envtmp = getenv("TMPDIR");
     91 
     92 	len = snprintf(path, sizeof(path), "%s/%sXXXXXX",
     93 	    envtmp ? envtmp : _PATH_TMP, prefix);
     94 	if ((size_t)len >= sizeof(path)) {
     95 		errno = ENAMETOOLONG;
     96 		return -1;
     97 	}
     98 
     99 	(void)sigfillset(&set);
    100 	(void)sigprocmask(SIG_BLOCK, &set, &oset);
    101 
    102 	if ((fd = mkstemp(path)) != -1) {
    103 		if (unlink(path) == -1)
    104 			goto out;
    105 
    106 		if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
    107 			goto out;
    108 
    109 		if (sb && fstat(fd, sb) == -1)
    110 			goto out;
    111 	}
    112 	(void)sigprocmask(SIG_SETMASK, &oset, NULL);
    113 	return fd;
    114 out:
    115 	serrno = errno;
    116 	(void)sigprocmask(SIG_SETMASK, &oset, NULL);
    117 	close(fd);
    118 	errno = serrno;
    119 	return -1;
    120 }
    121