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/* blkid.c - Prints type, label and UUID of filesystem(s).
*
* Copyright 2013 Brad Conroy <bconroy@uis.edu>
*
* See ftp://ftp.kernel.org/pub/linux/utils/util-linux/v2.24/libblkid-docs/api-index-full.html
USE_BLKID(NEWTOY(blkid, "<1", TOYFLAG_BIN))
USE_BLKID(OLDTOY(fstype, blkid, "<1", TOYFLAG_BIN))
config BLKID
bool "blkid"
default y
help
usage: blkid [block device...]
Prints type, label and UUID of filesystem.
*/
#define FOR_blkid
#include "toys.h"
struct fstype {
char *name;
uint64_t magic;
int magic_len, magic_offset, uuid_off, label_len, label_off;
};
static const struct fstype fstypes[] = {
// ext3 = buf[1116]&4 ext4 = buf[1120]&64
{"ext2", 0xEF53, 2, 1080, 1128, 16, 1144},
// label actually 8/16 0x4d80 but horrible: 16 bit wide characters via
// codepage, something called a uuid that's only 8 bytes long...
{"ntfs", 0x5346544e, 4, 3, 0x48+(8<<24), 0, 0},
{"adfs", 0xadf5, 2, 0xc00, 0,0,0},
{"bfs", 0x1badface, 4, 0, 0,0,0},
{"btrfs", 0x4D5F53665248425FULL, 8, 65600, 65803, 256, 65819},
{"cramfs", 0x28cd3d45, 4, 0, 0, 16, 48},
{"f2fs", 0xF2F52010, 4, 1024, 1132, 16, 1110},
{"jfs", 0x3153464a, 4, 32768, 32920, 16, 32904},
{"nilfs", 0x3434, 2, 1030, 1176, 80, 1192},
{"reiserfs", 0x724573496552, 6, 8244, 8276, 16, 8292},
{"reiserfs", 0x724573496552, 6, 65588, 65620, 16, 65536},
{"romfs", 0x2d6d6f72, 4, 0, 0,0,0},
{"squashfs", 0x73717368, 4, 0, 0,0,0},
{"xiafs", 0x012fd16d, 4, 572, 0,0,0},
{"xfs", 0x42534658, 4, 0, 32, 12, 108},
{"vfat", 0x3233544146, 5, 82, 67+(4<<24), 11, 71}, // fat32
{"vfat", 0x31544146, 4, 54, 39+(4<<24), 11, 43} // fat1
};
/* TODO if no args use proc/partitions */
void do_blkid(int fd, char *name)
{
int off, i, j;
char *type;
off = i = 0;
for (;;) {
int pass = 0, len;
// Read next block of data
len = readall(fd, toybuf, sizeof(toybuf));
if (len != sizeof(toybuf)) return;
// Iterate through types in range
for (i=0; i < sizeof(fstypes)/sizeof(struct fstype); i++) {
uint64_t test;
// Skip tests not in this 4k block
if (fstypes[i].magic_offset > off+sizeof(toybuf)) {
pass++;
continue;
}
if (fstypes[i].magic_offset < off) continue;
// Populate 64 bit little endian magic value
test = 0;
for (j = 0; j < fstypes[i].magic_len; j++)
test += ((uint64_t)toybuf[j+fstypes[i].magic_offset-off])<<(8*j);
if (test == fstypes[i].magic) break;
}
if (i == sizeof(fstypes)/sizeof(struct fstype)) {
off += len;
if (pass) continue;
return;
}
break;
}
// distinguish ext2/3/4
type = fstypes[i].name;
if (!i) {
if (toybuf[1116]&4) type = "ext3";
if (toybuf[1120]&64) type = "ext4";
}
// Could special case NTFS here...
// Output for fstype
if (*toys.which->name == 'f') {
puts(type);
return;
}
// output for blkid
printf("%s:",name);
if (fstypes[i].label_len)
printf(" LABEL=\"%.*s\"", fstypes[i].label_len,
toybuf+fstypes[i].label_off-off);
if (fstypes[i].uuid_off) {
int bits = 0x550, size = fstypes[i].uuid_off >> 24,
uoff = (fstypes[i].uuid_off & ((1<<24)-1))-off;
if (size) bits = 4*(size == 4);
else size = 16;
printf(" UUID=\"");
for (j = 0; j < size; j++) printf("-%02x"+!(bits & (1<<j)), toybuf[uoff+j]);
printf("\"");
}
printf(" TYPE=\"%s\"\n", fstypes[i].name);
}
void blkid_main(void)
{
loopfiles(toys.optargs, do_blkid);
}
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