1 /* blkid.c - Prints type, label and UUID of filesystem(s).
2 *
3 * Copyright 2013 Brad Conroy <bconroy@uis.edu>
4 *
5 * See ftp://ftp.kernel.org/pub/linux/utils/util-linux/v2.24/libblkid-docs/api-index-full.html
6
7 USE_BLKID(NEWTOY(blkid, 0, TOYFLAG_BIN))
8 USE_FSTYPE(NEWTOY(fstype, "<1", TOYFLAG_BIN))
9
10 config BLKID
11 bool "blkid"
12 default y
13 help
14 usage: blkid DEV...
15
16 Prints type, label and UUID of filesystem on a block device or image.
17
18 config FSTYPE
19 bool "fstype"
20 default y
21 help
22 usage: fstype DEV...
23
24 Prints type of filesystem on a block device or image.
25 */
26
27 #define FOR_blkid
28 #include "toys.h"
29
30 struct fstype {
31 char *name;
32 uint64_t magic;
33 int magic_len, magic_offset, uuid_off, label_len, label_off;
34 };
35
36 static const struct fstype fstypes[] = {
37 {"ext2", 0xEF53, 2, 1080, 1128, 16, 1144}, // keep this first for ext3/4 check
38 {"swap", 0x4341505350415753LL, 8, 4086, 1036, 15, 1052},
39 // NTFS label actually 8/16 0x4d80 but horrible: 16 bit wide characters via
40 // codepage, something called a uuid that's only 8 bytes long...
41 {"ntfs", 0x5346544e, 4, 3, 0x48+(8<<24), 0, 0},
42
43 {"adfs", 0xadf5, 2, 0xc00, 0,0,0},
44 {"bfs", 0x1badface, 4, 0, 0,0,0},
45 {"btrfs", 0x4D5F53665248425FULL, 8, 65600, 65803, 256, 65819},
46 {"cramfs", 0x28cd3d45, 4, 0, 0, 16, 48},
47 {"f2fs", 0xF2F52010, 4, 1024, 1132, 16, 1110},
48 {"jfs", 0x3153464a, 4, 32768, 32920, 16, 32904},
49 {"nilfs", 0x3434, 2, 1030, 1176, 80, 1192},
50 {"reiserfs", 0x724573496552ULL, 6, 8244, 8276, 16, 8292},
51 {"reiserfs", 0x724573496552ULL, 6, 65588, 65620, 16, 65636},
52 {"romfs", 0x2d6d6f72, 4, 0, 0,0,0},
53 {"squashfs", 0x73717368, 4, 0, 0,0,0},
54 {"xiafs", 0x012fd16d, 4, 572, 0,0,0},
55 {"xfs", 0x42534658, 4, 0, 32, 12, 108},
56 {"vfat", 0x3233544146ULL, 5, 82, 67+(4<<24), 11, 71}, // fat32
57 {"vfat", 0x31544146, 4, 54, 39+(4<<24), 11, 43} // fat1
58 };
59
do_blkid(int fd,char * name)60 static void do_blkid(int fd, char *name)
61 {
62 int off, i, j, len;
63 char *type;
64
65 off = i = 0;
66
67 for (;;) {
68 int pass = 0;
69
70 // Read next block of data
71 len = readall(fd, toybuf, sizeof(toybuf));
72 if (len != sizeof(toybuf)) return;
73
74 // Iterate through types in range
75 for (i=0; i < sizeof(fstypes)/sizeof(struct fstype); i++) {
76 uint64_t test;
77
78 // Skip tests not in this 4k block
79 if (fstypes[i].magic_offset > off+sizeof(toybuf)) {
80 pass++;
81 continue;
82 }
83 if (fstypes[i].magic_offset < off) continue;
84
85 // Populate 64 bit little endian magic value
86 test = 0;
87 for (j = 0; j < fstypes[i].magic_len; j++)
88 test += ((uint64_t)toybuf[j+fstypes[i].magic_offset-off])<<(8*j);
89 if (test == fstypes[i].magic) break;
90 }
91
92 if (i == ARRAY_LEN(fstypes)) {
93 off += len;
94 if (pass) continue;
95 return;
96 }
97 break;
98 }
99
100 // distinguish ext2/3/4
101 type = fstypes[i].name;
102 if (!i) {
103 if (toybuf[1116]&4) type = "ext3";
104 if (toybuf[1120]&64) type = "ext4";
105 }
106
107 // Could special case NTFS here...
108
109 // Output for fstype
110 if (*toys.which->name == 'f') {
111 puts(type);
112 return;
113 }
114
115 // output for blkid
116 printf("%s:",name);
117
118 if (fstypes[i].label_len) {
119 char *s = toybuf+fstypes[i].label_off-off;;
120
121 len = fstypes[i].label_len;
122 if (!strcmp(type, "vfat")) {
123 while (len && s[len-1]==' ') len--;
124 if (strstart(&s, "NO NAME")) len=0;
125 }
126 if (len) printf(" LABEL=\"%.*s\"", len, s);
127 }
128
129 if (fstypes[i].uuid_off) {
130 int bits = 0x550, size = fstypes[i].uuid_off >> 24,
131 uoff = (fstypes[i].uuid_off & ((1<<24)-1))-off;
132
133 if (size) bits = 4*(size == 4);
134 else size = 16;
135
136 printf(" UUID=\"");
137 for (j = 0; j < size; j++) printf("-%02x"+!(bits & (1<<j)), toybuf[uoff+j]);
138 printf("\"");
139 }
140
141 printf(" TYPE=\"%s\"\n", type);
142 }
143
blkid_main(void)144 void blkid_main(void)
145 {
146 if (*toys.optargs) loopfiles(toys.optargs, do_blkid);
147 else {
148 unsigned int ma, mi, sz, fd;
149 char *name = toybuf, *buffer = toybuf+1024, device[32];
150 FILE *fp = xfopen("/proc/partitions", "r");
151
152 while (fgets(buffer, 1024, fp)) {
153 *name = 0;
154 if (sscanf(buffer, " %u %u %u %[^\n ]", &ma, &mi, &sz, name) != 4)
155 continue;
156
157 sprintf(device, "/dev/%.20s", name);
158 if (-1 == (fd = open(device, O_RDONLY))) {
159 if (errno != ENOMEDIUM) perror_msg_raw(device);
160 } else {
161 do_blkid(fd, device);
162 close(fd);
163 }
164 }
165 if (CFG_TOYBOX_FREE) fclose(fp);
166 }
167 }
168
fstype_main(void)169 void fstype_main(void)
170 {
171 loopfiles(toys.optargs, do_blkid);
172 }
173