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/* $OpenBSD: rde_sets.c,v 1.10 2020/12/30 07:29:56 claudio Exp $ */
/*
* Copyright (c) 2018 Claudio Jeker <claudio@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "rde.h"
struct set_table {
void *set;
size_t nmemb;
size_t size;
size_t max;
};
struct as_set *
as_sets_new(struct as_set_head *as_sets, const char *name, size_t nmemb,
size_t size)
{
struct as_set *aset;
size_t len;
aset = calloc(1, sizeof(*aset));
if (aset == NULL)
return NULL;
len = strlcpy(aset->name, name, sizeof(aset->name));
assert(len < sizeof(aset->name));
aset->set = set_new(nmemb, size);
if (aset->set == NULL) {
free(aset);
return NULL;
}
SIMPLEQ_INSERT_TAIL(as_sets, aset, entry);
return aset;
}
struct as_set *
as_sets_lookup(struct as_set_head *as_sets, const char *name)
{
struct as_set *aset;
SIMPLEQ_FOREACH(aset, as_sets, entry) {
if (strcmp(aset->name, name) == 0)
return aset;
}
return NULL;
}
void
as_sets_free(struct as_set_head *as_sets)
{
struct as_set *aset;
if (as_sets == NULL)
return;
while (!SIMPLEQ_EMPTY(as_sets)) {
aset = SIMPLEQ_FIRST(as_sets);
SIMPLEQ_REMOVE_HEAD(as_sets, entry);
set_free(aset->set);
free(aset);
}
}
void
as_sets_mark_dirty(struct as_set_head *old, struct as_set_head *new)
{
struct as_set *n, *o;
SIMPLEQ_FOREACH(n, new, entry) {
if (old == NULL || (o = as_sets_lookup(old, n->name)) == NULL ||
!set_equal(n->set, o->set)) {
n->dirty = 1;
n->lastchange = getmonotime();
} else
n->lastchange = o->lastchange;
}
}
int
as_set_match(const struct as_set *aset, u_int32_t asnum)
{
return set_match(aset->set, asnum) != NULL;
}
struct set_table *
set_new(size_t nmemb, size_t size)
{
struct set_table *set;
set = calloc(1, sizeof(*set));
if (set == NULL)
return NULL;
if (nmemb == 0)
nmemb = 4;
set->size = size;
set->max = nmemb;
set->set = calloc(nmemb, set->size);
if (set->set == NULL) {
free(set);
return NULL;
}
rdemem.aset_cnt++;
rdemem.aset_size += sizeof(*set);
rdemem.aset_size += set->size * set->max;
return set;
}
void
set_free(struct set_table *set)
{
if (set == NULL)
return;
rdemem.aset_cnt--;
rdemem.aset_size -= sizeof(*set);
rdemem.aset_size -= set->size * set->max;
rdemem.aset_nmemb -= set->nmemb;
free(set->set);
free(set);
}
int
set_add(struct set_table *set, void *elms, size_t nelms)
{
if (set->max < nelms || set->max - nelms < set->nmemb) {
u_int32_t *s;
size_t new_size;
if (set->nmemb >= SIZE_MAX - 4096 - nelms) {
errno = ENOMEM;
return -1;
}
for (new_size = set->max; new_size < set->nmemb + nelms; )
new_size += (new_size < 4096 ? new_size : 4096);
s = reallocarray(set->set, new_size, set->size);
if (s == NULL)
return -1;
rdemem.aset_size += set->size * (new_size - set->max);
set->set = s;
set->max = new_size;
}
memcpy((u_int8_t *)set->set + set->nmemb * set->size, elms,
nelms * set->size);
set->nmemb += nelms;
rdemem.aset_nmemb += nelms;
return 0;
}
void *
set_get(struct set_table *set, size_t *nelms)
{
*nelms = set->nmemb;
return set->set;
}
static int
set_cmp(const void *ap, const void *bp)
{
const u_int32_t *a = ap;
const u_int32_t *b = bp;
if (*a > *b)
return 1;
else if (*a < *b)
return -1;
return 0;
}
void
set_prep(struct set_table *set)
{
if (set == NULL)
return;
qsort(set->set, set->nmemb, set->size, set_cmp);
}
void *
set_match(const struct set_table *a, u_int32_t asnum)
{
if (a == NULL)
return NULL;
return bsearch(&asnum, a->set, a->nmemb, a->size, set_cmp);
}
int
set_equal(const struct set_table *a, const struct set_table *b)
{
/* allow NULL pointers to be passed */
if (a == NULL && b == NULL)
return 1;
if (a == NULL || b == NULL)
return 0;
if (a->nmemb != b->nmemb)
return 0;
if (memcmp(a->set, b->set, a->nmemb * a->size) != 0)
return 0;
return 1;
}
size_t
set_nmemb(const struct set_table *set)
{
return set->nmemb;
}
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