1 files changed, 70 insertions, 0 deletions
diff --git a/lib/cookies/lru_cache.c b/lib/cookies/lru_cache.c
new file mode 100644
index 0000000..8ea97ab
--- /dev/null
+++ b/lib/cookies/lru_cache.c
@@ -0,0 +1,70 @@
+/*  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();
+}