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/* Copyright (C) 2016-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <libknot/rrtype/opt.h>
#include <string.h>
#include "lib/cookies/lru_cache.h"
#include "lib/utils.h"
const uint8_t *kr_cookie_lru_get(kr_cookie_lru_t *cache,
const struct sockaddr *sa)
{
if (!cache || !sa) {
return NULL;
}
int addr_len = kr_inaddr_len(sa);
const char *addr = kr_inaddr(sa);
if (!addr || addr_len <= 0) {
return NULL;
}
struct cookie_opt_data *cached = lru_get_try(cache, addr, addr_len);
return cached ? cached->opt_data : NULL;
}
int kr_cookie_lru_set(kr_cookie_lru_t *cache, const struct sockaddr *sa,
uint8_t *opt)
{
if (!cache || !sa) {
return kr_error(EINVAL);
}
if (!opt) {
return kr_ok();
}
int addr_len = kr_inaddr_len(sa);
const char *addr = kr_inaddr(sa);
if (!addr || addr_len <= 0) {
return kr_error(EINVAL);
}
uint16_t opt_size = KNOT_EDNS_OPTION_HDRLEN +
knot_edns_opt_get_length(opt);
if (opt_size > KR_COOKIE_OPT_MAX_LEN) {
return kr_error(EINVAL);
}
struct cookie_opt_data *cached = lru_get_new(cache, addr, addr_len, NULL);
if (cached) {
memcpy(cached->opt_data, opt, opt_size);
}
return kr_ok();
}
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