1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2005-2008 Poul-Henning Kamp
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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31#include <assert.h>
32#include <errno.h>
33#include <stdio.h>
34#include <string.h>
35#include <unistd.h>
36#include <fcntl.h>
37#include <stdlib.h>
38#include <sys/endian.h>
39#include <sys/stat.h>
40#include <sys/disk.h>
41
42#include "fifolog.h"
43#include "libfifolog.h"
44
45const char *
46fifolog_create(const char *fn, off_t size, ssize_t recsize)
47{
48	int i, fd;
49	ssize_t u;
50	u_int uu;
51	off_t ms;
52	struct stat st;
53	char *buf;
54	int created;
55
56	fd = open(fn, O_WRONLY | O_TRUNC | O_EXCL | O_CREAT, 0644);
57	if (fd < 0) {
58		created = 0;
59		fd = open(fn, O_WRONLY);
60		if (fd < 0)
61			return ("Could not open");
62	} else
63		created = 1;
64
65	/* Default sectorsize is 512 */
66	if (recsize == 0)
67		recsize = 512;
68
69	/* See what we got... */
70	i = fstat(fd, &st);
71	assert(i == 0);
72	if (!S_ISBLK(st.st_mode) &&
73	    !S_ISCHR(st.st_mode) &&
74	    !S_ISREG(st.st_mode)) {
75		assert(!close (fd));
76		return ("Wrong file type");
77	}
78
79	if(!created && S_ISREG(st.st_mode)) {
80		assert(!close (fd));
81		return ("Wrong file type");
82	}
83
84	/* For raw disk with larger sectors: use 1 sector */
85	i = ioctl(fd, DIOCGSECTORSIZE, &uu);
86	u = uu;
87	if (i == 0 && (u > recsize || (recsize % u) != 0))
88		recsize = u;
89
90	/* If no configured size, or too large for disk, use device size */
91	i = ioctl(fd, DIOCGMEDIASIZE, &ms);
92	if (i == 0 && (size == 0 || size > ms))
93		size = ms;
94
95	if (size == 0 && S_ISREG(st.st_mode))
96		size = st.st_size;
97
98	if (size == 0)
99		size = recsize * (off_t)(24*60*60);
100
101	if (S_ISREG(st.st_mode) && ftruncate(fd, size) < 0)
102		return ("Could not ftrunc");
103
104	buf = calloc(1, recsize);
105	if (buf == NULL)
106		return ("Could not malloc");
107
108	strcpy(buf, FIFOLOG_FMT_MAGIC);		/*lint !e64 */
109	be32enc(buf + FIFOLOG_OFF_BS, recsize);
110	if (recsize != pwrite(fd, buf, recsize, 0)) {
111		i = errno;
112		free(buf);
113		errno = i;
114		return ("Could not write first sector");
115	}
116	memset(buf, 0, recsize);
117	if ((int)recsize != pwrite(fd, buf, recsize, recsize)) {
118		i = errno;
119		free(buf);
120		errno = i;
121		return ("Could not write second sector");
122	}
123	free(buf);
124	assert(0 == close(fd));
125	return (NULL);
126}
127