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/*
* Copyright (C) 2016 Jo-Philipp Wich <jo@mein.io>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <dlfcn.h>
#include <string.h>
#include <stdbool.h>
#include <blkid/blkid.h>
#include <libubox/utils.h>
#include "probe.h"
static struct {
bool loaded;
blkid_probe (*alloc)(const char *);
int (*probe)(blkid_probe);
int (*lookup)(blkid_probe, const char *, const char **, size_t *);
void (*free)(blkid_probe);
} libblkid = { };
static bool
load_libblkid(void)
{
void *lib;
if (!libblkid.loaded) {
lib = dlopen("libblkid.so", RTLD_GLOBAL);
if (lib == NULL)
lib = dlopen("libblkid.so.1", RTLD_GLOBAL);
if (lib) {
libblkid.alloc = dlsym(lib, "blkid_new_probe_from_filename");
libblkid.probe = dlsym(lib, "blkid_do_probe");
libblkid.lookup = dlsym(lib, "blkid_probe_lookup_value");
libblkid.free = dlsym(lib, "blkid_free_probe");
}
libblkid.loaded = true;
}
return (libblkid.alloc && libblkid.probe && libblkid.lookup && libblkid.free);
}
struct probe_info *
probe_path_libblkid(const char *path)
{
blkid_probe pr;
struct probe_info *info = NULL;
size_t type_len, uuid_len, label_len, version_len;
char *dev_ptr, *type_ptr, *uuid_ptr, *label_ptr, *version_ptr;
const char *type_val, *uuid_val, *label_val, *version_val;
if (!load_libblkid())
return NULL;
pr = libblkid.alloc(path);
if (!pr)
return NULL;
if (libblkid.probe(pr) == 0) {
if (libblkid.lookup(pr, "TYPE", &type_val, &type_len))
type_len = 0;
if (libblkid.lookup(pr, "UUID", &uuid_val, &uuid_len))
uuid_len = 0;
if (libblkid.lookup(pr, "LABEL", &label_val, &label_len))
label_len = 0;
if (libblkid.lookup(pr, "VERSION", &version_val, &version_len))
version_len = 0;
if (type_len) {
info = calloc_a(sizeof(*info),
&dev_ptr, strlen(path) + 1,
&type_ptr, type_len,
&uuid_ptr, uuid_len,
&label_ptr, label_len,
&version_ptr, version_len);
if (info) {
info->dev = strcpy(dev_ptr, path);
info->type = strcpy(type_ptr, type_val);
if (uuid_len)
info->uuid = strcpy(uuid_ptr, uuid_val);
if (label_len)
info->label = strcpy(label_ptr, label_val);
if (version_len)
info->version = strcpy(version_ptr, version_val);
}
}
}
libblkid.free(pr);
return info;
}
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