1 /* blkid.c - Prints type, label and UUID of filesystem(s). 2 * 3 * Copyright 2013 Brad Conroy <bconroy (at) 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 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 && *s) 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 } 143 144 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 } 168 169 void fstype_main(void) 170 { 171 loopfiles(toys.optargs, do_blkid); 172 } 173
