1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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
29#include <assert.h>
30#include <errno.h>
31#include <stdio.h>
32#include <string.h>
33#include <unistd.h>
34#include <fcntl.h>
35#include <stdlib.h>
36#include <sys/endian.h>
37#include <sys/stat.h>
38#include <sys/disk.h>
39
40#include "fifolog.h"
41#include "libfifolog.h"
42
43const char *
44fifolog_create(const char *fn, off_t size, ssize_t recsize)
45{
46	int i, fd;
47	ssize_t u;
48	u_int uu;
49	off_t ms;
50	struct stat st;
51	char *buf;
52	int created;
53
54	fd = open(fn, O_WRONLY | O_TRUNC | O_EXCL | O_CREAT, 0644);
55	if (fd < 0) {
56		created = 0;
57		fd = open(fn, O_WRONLY);
58		if (fd < 0)
59			return ("Could not open");
60	} else
61		created = 1;
62
63	/* Default sectorsize is 512 */
64	if (recsize == 0)
65		recsize = 512;
66
67	/* See what we got... */
68	i = fstat(fd, &st);
69	assert(i == 0);
70	if (!S_ISBLK(st.st_mode) &&
71	    !S_ISCHR(st.st_mode) &&
72	    !S_ISREG(st.st_mode)) {
73		assert(!close (fd));
74		return ("Wrong file type");
75	}
76
77	if(!created && S_ISREG(st.st_mode)) {
78		assert(!close (fd));
79		return ("Wrong file type");
80	}
81
82	/* For raw disk with larger sectors: use 1 sector */
83	i = ioctl(fd, DIOCGSECTORSIZE, &uu);
84	u = uu;
85	if (i == 0 && (u > recsize || (recsize % u) != 0))
86		recsize = u;
87
88	/* If no configured size, or too large for disk, use device size */
89	i = ioctl(fd, DIOCGMEDIASIZE, &ms);
90	if (i == 0 && (size == 0 || size > ms))
91		size = ms;
92
93	if (size == 0 && S_ISREG(st.st_mode))
94		size = st.st_size;
95
96	if (size == 0)
97		size = recsize * (off_t)(24*60*60);
98
99	if (S_ISREG(st.st_mode) && ftruncate(fd, size) < 0)
100		return ("Could not ftrunc");
101
102	buf = calloc(1, recsize);
103	if (buf == NULL)
104		return ("Could not malloc");
105
106	strcpy(buf, FIFOLOG_FMT_MAGIC);		/*lint !e64 */
107	be32enc(buf + FIFOLOG_OFF_BS, recsize);
108	if (recsize != pwrite(fd, buf, recsize, 0)) {
109		i = errno;
110		free(buf);
111		errno = i;
112		return ("Could not write first sector");
113	}
114	memset(buf, 0, recsize);
115	if ((int)recsize != pwrite(fd, buf, recsize, recsize)) {
116		i = errno;
117		free(buf);
118		errno = i;
119		return ("Could not write second sector");
120	}
121	free(buf);
122	assert(0 == close(fd));
123	return (NULL);
124}
125