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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
- * TODO: -U and -L should require arguments
- USE_BLKID(NEWTOY(blkid, "ULs*[!LU]", TOYFLAG_BIN))
- USE_FSTYPE(NEWTOY(fstype, "<1", TOYFLAG_BIN))
- config BLKID
- bool "blkid"
- default y
- help
- usage: blkid [-s TAG] [-UL] DEV...
- Print type, label and UUID of filesystem on a block device or image.
- -U Show UUID only (or device with that UUID)
- -L Show LABEL only (or device with that LABEL)
- -s TAG Only show matching tags (default all)
- config FSTYPE
- bool "fstype"
- default y
- help
- usage: fstype DEV...
- Print type of filesystem on a block device or image.
- */
- #define FOR_blkid
- #include "toys.h"
- GLOBALS(
- struct arg_list *s;
- )
- struct fstype {
- char *name;
- uint64_t magic;
- int magic_len, magic_offset, uuid_off, label_len, label_off;
- } static const fstypes[] = {
- {"ext2", 0xEF53, 2, 1080, 1128, 16, 1144}, // keep this first for ext3/4 check
- {"swap", 0x4341505350415753LL, 8, 4086, 1036, 15, 1052},
- // 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, 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, 512, 0x47c},
- {"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, 65636},
- {"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, 11, 71}, // fat32
- {"vfat", 0x31544146, 4, 54, 39, 11, 43} // fat1
- };
- static void show_tag(char *key, char *value)
- {
- int show = 0;
- struct arg_list *al;
- if (TT.s) {
- for (al = TT.s; al; al = al->next) if (!strcmp(key, al->arg)) show = 1;
- } else show = 1;
- if (show && *value) printf(" %s=\"%s\"", key, value);
- }
- static void flagshow(char *s, char *name)
- {
- if (*toys.optargs && strcmp(s, *toys.optargs)) return;
- printf("%s\n", *toys.optargs ? name : s);
- if (*toys.optargs) xexit();
- }
- static void do_blkid(int fd, char *name)
- {
- int off, i, j, len;
- char buf[128], *type, *s;
- off = i = 0;
- for (;;) {
- int pass = 0;
- // 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<ARRAY_LEN(fstypes); 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";
- }
- // Output for fstype
- if (*toys.which->name == 'f') {
- puts(type);
- return;
- }
- // output for blkid
- if (!FLAG(L) && !FLAG(U)) printf("%s:",name);
- len = fstypes[i].label_len;
- if (!FLAG(U) && len) {
- s = toybuf+fstypes[i].label_off-off;
- if (!strcmp(type, "vfat")) {
- show_tag("SEC_TYPE", "msdos");
- while (len && s[len-1]==' ') len--;
- if (strstart(&s, "NO NAME")) len=0;
- }
- // TODO: special case NTFS $VOLUME_NAME here...
- if (len) {
- if (!strcmp(type, "f2fs")) {
- // Convert UTF16LE to ASCII by replacing non-ASCII with '?'.
- // TODO: support non-ASCII.
- for (j=0; j<len; j++) {
- buf[j] = s[2*j];
- if (s[2*j+1]) buf[j]='?';
- if (!buf[j]) break;
- }
- } else sprintf(buf, "%.*s", len, s);
- if (FLAG(L)) return flagshow(buf, name);
- show_tag("LABEL", buf);
- }
- }
- len = fstypes[i].uuid_off;
- if (!FLAG(L) && len) {
- int uoff = len-off;
- // Assemble UUID with whatever size and set of dashes this filesystem uses
- s = buf;
- if (!strcmp(type, "ntfs")) {
- for (j = 7; j >= 0; --j) s += sprintf(s, "%02X", toybuf[uoff+j]);
- } else if (!strcmp(type, "vfat")) {
- s += sprintf(s, "%02X%02X-%02X%02X", toybuf[uoff+3], toybuf[uoff+2],
- toybuf[uoff+1], toybuf[uoff]);
- } else {
- for (j = 0; j < 16; j++)
- s += sprintf(s, "-%02x"+!(0x550 & (1<<j)), toybuf[uoff+j]);
- }
- if (FLAG(U)) return flagshow(buf, name);
- show_tag("UUID", buf);
- }
- if ((!strcmp(type, "ext3")||!strcmp(type,"ext4")) && !(toybuf[1120]&~0x12))
- show_tag("SEC_TYPE", "ext2");
- if (FLAG(U) || FLAG(L)) return;
- show_tag("TYPE", type);
- xputc('\n');
- }
- void blkid_main(void)
- {
- if (*toys.optargs && !FLAG(L) && !FLAG(U)) loopfiles(toys.optargs, do_blkid);
- else {
- unsigned int ma, mi, sz, fd;
- char name[32], device[5+32];
- FILE *fp = xfopen("/proc/partitions", "r");
- while (fgets(toybuf, sizeof(toybuf), fp)) {
- if (sscanf(toybuf, " %u %u %u %31s", &ma, &mi, &sz, name) != 4)
- continue;
- sprintf(device, "/dev/%.20s", name);
- if (-1 == (fd = open(device, O_RDONLY))) {
- if (errno != ENOMEDIUM) perror_msg_raw(device);
- } else {
- do_blkid(fd, device);
- close(fd);
- }
- }
- if (CFG_TOYBOX_FREE) fclose(fp);
- }
- if (FLAG(L) || FLAG(U)) toys.exitval = 2;
- }
- void fstype_main(void)
- {
- loopfiles(toys.optargs, do_blkid);
- }
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