Mirror of the official OpenWrt ubus repository https://git.openwrt.org/project/ubus
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/*
* Copyright (C) 2011 Felix Fietkau <nbd@openwrt.org>
*
* 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <libubox/avl-cmp.h>
#include "ubusmsg.h"
#include "ubusd_id.h"
static int random_fd = -1;
static int ubus_cmp_id(const void *k1, const void *k2, void *ptr)
{
const uint32_t *id1 = k1, *id2 = k2;
if (*id1 < *id2)
return -1;
else
return *id1 > *id2;
}
void ubus_init_string_tree(struct avl_tree *tree, bool dup)
{
avl_init(tree, avl_strcmp, dup, NULL);
}
void ubus_init_id_tree(struct avl_tree *tree)
{
if (random_fd < 0) {
random_fd = open("/dev/urandom", O_RDONLY);
if (random_fd < 0) {
perror("open");
exit(1);
}
}
avl_init(tree, ubus_cmp_id, false, NULL);
}
bool ubus_alloc_id(struct avl_tree *tree, struct ubus_id *id, uint32_t val)
{
id->avl.key = &id->id;
if (val) {
id->id = val;
return avl_insert(tree, &id->avl) == 0;
}
do {
if (read(random_fd, &id->id, sizeof(id->id)) != sizeof(id->id))
return false;
if (id->id < UBUS_SYSTEM_OBJECT_MAX)
continue;
} while (avl_insert(tree, &id->avl) != 0);
return true;
}