1e19afd38a
function old new delta display_uuid_cache - 89 +89 blkid_main - 8 +8 applet_names 1871 1877 +6 applet_main 1140 1144 +4 applet_nameofs 570 572 +2 packed_usage 24737 24735 -2 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 3/1 up/down: 109/-2) Total: 107 bytes
431 lines
9.1 KiB
C
431 lines
9.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Support functions for mounting devices by label/uuid
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*
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* Copyright (C) 2006 by Jason Schoon <floydpink@gmail.com>
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* Some portions cribbed from e2fsprogs, util-linux, dosfstools
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "volume_id_internal.h"
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//#define BLKGETSIZE64 _IOR(0x12,114,size_t)
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static struct uuidCache_s {
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struct uuidCache_s *next;
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// int major, minor;
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char *device;
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char *label;
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char *uc_uuid; /* prefix makes it easier to grep for */
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} *uuidCache;
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/* Returns !0 on error.
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* Otherwise, returns malloc'ed strings for label and uuid
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* (and they can't be NULL, although they can be "") */
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#if !ENABLE_FEATURE_VOLUMEID_ISO9660
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#define get_label_uuid(device, label, uuid, iso_only) \
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get_label_uuid(device, label, uuid)
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#endif
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static int
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get_label_uuid(const char *device, char **label, char **uuid, int iso_only)
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{
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int rv = 1;
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uint64_t size;
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struct volume_id *vid;
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vid = volume_id_open_node(device);
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if (!vid)
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return rv;
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if (ioctl(vid->fd, BLKGETSIZE64, &size) != 0)
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size = 0;
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#if ENABLE_FEATURE_VOLUMEID_ISO9660
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if ((iso_only ?
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volume_id_probe_iso9660(vid, 0) :
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volume_id_probe_all(vid, 0, size)
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) != 0
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) {
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goto ret;
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}
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#else
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if (volume_id_probe_all(vid, 0, size) != 0) {
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goto ret;
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}
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#endif
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if (vid->label[0] != '\0' || vid->uuid[0] != '\0') {
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*label = xstrndup(vid->label, sizeof(vid->label));
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*uuid = xstrndup(vid->uuid, sizeof(vid->uuid));
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dbg("found label '%s', uuid '%s' on %s", *label, *uuid, device);
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rv = 0;
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}
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ret:
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free_volume_id(vid);
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return rv;
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}
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/* NB: we take ownership of (malloc'ed) label and uuid */
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static void
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uuidcache_addentry(char *device, /*int major, int minor,*/ char *label, char *uuid)
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{
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struct uuidCache_s *last;
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if (!uuidCache) {
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last = uuidCache = xzalloc(sizeof(*uuidCache));
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} else {
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for (last = uuidCache; last->next; last = last->next)
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continue;
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last->next = xzalloc(sizeof(*uuidCache));
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last = last->next;
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}
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/*last->next = NULL; - xzalloc did it*/
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// last->major = major;
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// last->minor = minor;
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last->device = device;
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last->label = label;
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last->uc_uuid = uuid;
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}
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/* If get_label_uuid() on device_name returns success,
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* add a cache entry for this device.
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* If device node does not exist, it will be temporarily created. */
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#if !ENABLE_FEATURE_VOLUMEID_ISO9660
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#define uuidcache_check_device(device_name, ma, mi, iso_only) \
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uuidcache_check_device(device_name, ma, mi)
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#endif
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static void
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uuidcache_check_device(const char *device_name, int ma, int mi, int iso_only)
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{
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char *device, *last_slash;
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char *uuid, *label;
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char *ptr;
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int must_remove = 0;
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int added = 0;
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last_slash = NULL;
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device = xasprintf("/dev/%s", device_name);
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if (access(device, F_OK) != 0) {
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/* device does not exist, temporarily create */
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int slash_cnt = 0;
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if ((ma | mi) < 0)
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goto ret; /* we don't know major:minor! */
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ptr = device;
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while (*ptr)
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if (*ptr++ == '/')
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slash_cnt++;
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if (slash_cnt > 2) {
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// BUG: handles only slash_cnt == 3 case
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last_slash = strrchr(device, '/');
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*last_slash = '\0';
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if (mkdir(device, 0644)) {
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bb_perror_msg("can't create directory %s", device);
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*last_slash = '/';
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last_slash = NULL; /* prevents rmdir */
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} else {
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*last_slash = '/';
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}
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}
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mknod(device, S_IFBLK | 0600, makedev(ma, mi));
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must_remove = 1;
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}
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uuid = NULL;
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label = NULL;
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if (get_label_uuid(device, &label, &uuid, iso_only) == 0) {
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uuidcache_addentry(device, /*ma, mi,*/ label, uuid);
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/* "device" is owned by cache now, don't free */
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added = 1;
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}
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if (must_remove)
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unlink(device);
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if (last_slash) {
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*last_slash = '\0';
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rmdir(device);
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}
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ret:
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if (!added)
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free(device);
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}
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/* Run uuidcache_check_device() for every device mentioned
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* in /proc/partitions */
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static void
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uuidcache_init_partitions(void)
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{
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char line[100];
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int ma, mi;
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unsigned long long sz;
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FILE *procpt;
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int firstPass;
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int handleOnFirst;
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char *chptr;
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procpt = xfopen_for_read("/proc/partitions");
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/*
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# cat /proc/partitions
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major minor #blocks name
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8 0 293036184 sda
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8 1 6835626 sda1
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8 2 1 sda2
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8 5 979933 sda5
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8 6 15623181 sda6
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8 7 97659103 sda7
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8 8 171935631 sda8
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*/
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for (firstPass = 1; firstPass >= 0; firstPass--) {
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fseek(procpt, 0, SEEK_SET);
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while (fgets(line, sizeof(line), procpt)) {
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/* The original version of this code used sscanf, but
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diet's sscanf is quite limited */
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chptr = line;
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if (*chptr != ' ') continue;
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chptr = skip_whitespace(chptr);
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ma = bb_strtou(chptr, &chptr, 0);
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if (ma < 0) continue;
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chptr = skip_whitespace(chptr);
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mi = bb_strtou(chptr, &chptr, 0);
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if (mi < 0) continue;
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chptr = skip_whitespace(chptr);
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sz = bb_strtoull(chptr, &chptr, 0);
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if ((long long)sz == -1LL) continue;
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chptr = skip_whitespace(chptr);
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/* skip extended partitions (heuristic: size 1) */
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if (sz == 1)
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continue;
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*strchrnul(chptr, '\n') = '\0';
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/* now chptr => device name */
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dbg("/proc/partitions: maj:%d min:%d sz:%llu name:'%s'",
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ma, mi, sz, chptr);
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if (!chptr[0])
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continue;
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/* look only at md devices on first pass */
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handleOnFirst = (chptr[0] == 'm' && chptr[1] == 'd');
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if (firstPass != handleOnFirst)
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continue;
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/* heuristic: partition name ends in a digit */
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if (isdigit(chptr[strlen(chptr) - 1])) {
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uuidcache_check_device(chptr, ma, mi, 0);
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}
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}
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}
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fclose(procpt);
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}
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static void
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dev_get_major_minor(char *device_name, int *major, int *minor)
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{
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char dev[16];
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char *dev_path;
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char *colon;
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int sz;
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dev_path = xasprintf("/sys/block/%s/dev", device_name);
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sz = open_read_close(dev_path, dev, sizeof(dev) - 1);
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if (sz < 0)
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goto ret;
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dev[sz] = '\0';
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colon = strchr(dev, ':');
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if (!colon)
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goto ret;
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*major = bb_strtou(dev, NULL, 10);
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*minor = bb_strtou(colon + 1, NULL, 10);
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ret:
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free(dev_path);
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return;
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}
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static void
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uuidcache_init_cdroms(void)
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{
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#define PROC_CDROMS "/proc/sys/dev/cdrom/info"
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char line[100];
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int ma, mi;
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FILE *proccd;
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proccd = fopen_for_read(PROC_CDROMS);
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if (!proccd) {
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// static smallint warn = 0;
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// if (!warn) {
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// warn = 1;
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// bb_error_msg("can't open %s, UUID and LABEL "
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// "conversion cannot be done for CD-Roms",
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// PROC_CDROMS);
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// }
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return;
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}
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while (fgets(line, sizeof(line), proccd)) {
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static const char drive_name_string[] ALIGN1 = "drive name:";
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if (strncmp(line, drive_name_string, sizeof(drive_name_string) - 1) == 0) {
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char *device_name;
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device_name = strtok(skip_whitespace(line + sizeof(drive_name_string) - 1), " \t\n");
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while (device_name && device_name[0]) {
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ma = mi = -1;
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dev_get_major_minor(device_name, &ma, &mi);
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uuidcache_check_device(device_name, ma, mi, 1);
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device_name = strtok(NULL, " \t\n");
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}
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break;
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}
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}
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fclose(proccd);
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}
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static void
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uuidcache_init(void)
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{
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if (uuidCache)
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return;
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uuidcache_init_partitions();
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uuidcache_init_cdroms();
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}
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#define UUID 1
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#define VOL 2
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#ifdef UNUSED
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static char *
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get_spec_by_x(int n, const char *t, int *majorPtr, int *minorPtr)
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{
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struct uuidCache_s *uc;
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uuidcache_init();
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uc = uuidCache;
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while (uc) {
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switch (n) {
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case UUID:
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if (strcmp(t, uc->uc_uuid) == 0) {
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*majorPtr = uc->major;
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*minorPtr = uc->minor;
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return uc->device;
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}
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break;
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case VOL:
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if (strcmp(t, uc->label) == 0) {
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*majorPtr = uc->major;
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*minorPtr = uc->minor;
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return uc->device;
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}
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break;
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}
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uc = uc->next;
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}
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return NULL;
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}
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static unsigned char
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fromhex(char c)
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{
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if (isdigit(c))
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return (c - '0');
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return ((c|0x20) - 'a' + 10);
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}
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static char *
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get_spec_by_uuid(const char *s, int *major, int *minor)
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{
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unsigned char uuid[16];
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int i;
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if (strlen(s) != 36 || s[8] != '-' || s[13] != '-'
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|| s[18] != '-' || s[23] != '-'
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) {
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goto bad_uuid;
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}
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for (i = 0; i < 16; i++) {
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if (*s == '-')
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s++;
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if (!isxdigit(s[0]) || !isxdigit(s[1]))
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goto bad_uuid;
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uuid[i] = ((fromhex(s[0]) << 4) | fromhex(s[1]));
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s += 2;
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}
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return get_spec_by_x(UUID, (char *)uuid, major, minor);
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bad_uuid:
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fprintf(stderr, _("mount: bad UUID"));
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return 0;
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}
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static char *
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get_spec_by_volume_label(const char *s, int *major, int *minor)
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{
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return get_spec_by_x(VOL, s, major, minor);
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}
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#endif // UNUSED
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/* Used by blkid */
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void display_uuid_cache(void)
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{
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struct uuidCache_s *u;
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uuidcache_init();
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u = uuidCache;
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while (u) {
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printf("%s:", u->device);
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if (u->label[0])
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printf(" LABEL=\"%s\"", u->label);
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if (u->uc_uuid[0])
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printf(" UUID=\"%s\"", u->uc_uuid);
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bb_putchar('\n');
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u = u->next;
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}
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}
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/* Used by mount and findfs */
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char *get_devname_from_label(const char *spec)
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{
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struct uuidCache_s *uc;
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int spec_len = strlen(spec);
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uuidcache_init();
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uc = uuidCache;
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while (uc) {
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// FIXME: empty label ("LABEL=") matches anything??!
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if (uc->label[0] && strncmp(spec, uc->label, spec_len) == 0) {
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return xstrdup(uc->device);
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}
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uc = uc->next;
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}
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return NULL;
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}
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char *get_devname_from_uuid(const char *spec)
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{
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struct uuidCache_s *uc;
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uuidcache_init();
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uc = uuidCache;
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while (uc) {
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/* case of hex numbers doesn't matter */
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if (strcasecmp(spec, uc->uc_uuid) == 0) {
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return xstrdup(uc->device);
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}
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uc = uc->next;
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}
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return NULL;
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}
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