1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
/* 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, 0, TOYFLAG_BIN))
USE_FSTYPE(NEWTOY(fstype, "<1", TOYFLAG_BIN))
config BLKID
bool "blkid"
default y
help
usage: blkid DEV...
Prints type, label and UUID of filesystem on a block device or image.
config FSTYPE
bool "fstype"
default y
help
usage: fstype DEV...
Prints type of filesystem on a block device or image.
*/
#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[] = {
{"swap", 0x4341505350415753, 8, 4086, 1036, 15, 1052},
{"ext2", 0xEF53, 2, 1080, 1128, 16, 1144}, // keep this first for ext3/4 check
// NTFS 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", 0x724573496552ULL, 6, 8244, 8276, 16, 8292},
{"reiserfs", 0x724573496552ULL, 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", 0x3233544146ULL, 5, 82, 67+(4<<24), 11, 71}, // fat32
{"vfat", 0x31544146, 4, 54, 39+(4<<24), 11, 43} // fat1
};
static 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 == ARRAY_LEN(fstypes)) {
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", type);
}
void blkid_main(void)
{
if (*toys.optargs) loopfiles(toys.optargs, do_blkid);
else {
unsigned int ma, mi, sz, fd;
char *name = toybuf, *buffer = toybuf+1024, device[32];
FILE *fp = xfopen("/proc/partitions", "r");
while (fgets(buffer, 1024, fp)) {
*name = 0;
if (sscanf(buffer, " %u %u %u %[^\n ]", &ma, &mi, &sz, name) != 4)
continue;
sprintf(device, "/dev/%.20s", name);
if (-1 == (fd = open(device, O_RDONLY))) {
if (errno != ENOMEDIUM) perror_msg("%s", device);
} else {
do_blkid(fd, device);
close(fd);
}
}
if (CFG_TOYBOX_FREE) fclose(fp);
}
}
void fstype_main(void)
{
loopfiles(toys.optargs, do_blkid);
}
|
