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author | trasz <trasz@FreeBSD.org> | 2014-12-10 14:14:16 +0000 |
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committer | trasz <trasz@FreeBSD.org> | 2014-12-10 14:14:16 +0000 |
commit | 3e3c248f832f796881ac2ce0d45049552e8d9a9b (patch) | |
tree | 546110ab5c2bb898673bb9c5debe59c90d92f1a6 /usr.sbin/fstyp/ext2fs.c | |
parent | 9d0e5e2b5eef756cc6be10d18308fb4c79828ab9 (diff) | |
download | FreeBSD-src-3e3c248f832f796881ac2ce0d45049552e8d9a9b.zip FreeBSD-src-3e3c248f832f796881ac2ce0d45049552e8d9a9b.tar.gz |
Add fstyp(8). This utility, named after its SVR4 counterpart, detects
filesystems. It differs from file(1) in that it gives machine-parseable
output, it outputs filesystem labels, doesn't get confused by other
formats metadata, and runs in Capsicum sandbox.
Differential Revision: https://reviews.freebsd.org/D1255
Relnotes: yes
Sponsored by: The FreeBSD Foundation
Diffstat (limited to 'usr.sbin/fstyp/ext2fs.c')
-rw-r--r-- | usr.sbin/fstyp/ext2fs.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/usr.sbin/fstyp/ext2fs.c b/usr.sbin/fstyp/ext2fs.c new file mode 100644 index 0000000..df9e66e --- /dev/null +++ b/usr.sbin/fstyp/ext2fs.c @@ -0,0 +1,90 @@ +/*- + * Copyright (c) 2005 Stanislav Sedov + * Copyright (c) 2014 The FreeBSD Foundation + * All rights reserved. + * + * This software was developed by Edward Tomasz Napierala under sponsorship + * from the FreeBSD Foundation. + * + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <stdio.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> + +#include "fstyp.h" + +#define EXT2FS_SB_OFFSET 1024 +#define EXT2_SUPER_MAGIC 0xef53 +#define EXT2_DYNAMIC_REV 1 + +typedef struct e2sb { + uint8_t fake1[56]; + uint16_t s_magic; + uint8_t fake2[18]; + uint32_t s_rev_level; + uint8_t fake3[40]; + char s_volume_name[16]; +} e2sb_t; + +int +fstyp_ext2fs(FILE *fp, char *label, size_t size) +{ + e2sb_t *fs; + char *s_volume_name; + + fs = (e2sb_t *)read_buf(fp, EXT2FS_SB_OFFSET, 512); + if (fs == NULL) + return (1); + + /* Check for magic and versio n*/ + if (fs->s_magic == EXT2_SUPER_MAGIC && + fs->s_rev_level == EXT2_DYNAMIC_REV) { + //G_LABEL_DEBUG(1, "ext2fs file system detected on %s.", + // pp->name); + } else { + free(fs); + return (1); + } + + s_volume_name = fs->s_volume_name; + /* Terminate label */ + s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0'; + + if (s_volume_name[0] == '/') + s_volume_name += 1; + + /* Check for volume label */ + if (s_volume_name[0] == '\0') { + free(fs); + return (1); + } + + strlcpy(label, s_volume_name, size); + + return (0); +} |