From: Karel Slany <karel.slany@nic.cz>
Date: Fri, 22 May 2015 10:46:22 +0000 (+0200)
Subject: lib/cache: RRSIG RRsets have a separate cache storing mechanism
X-Git-Tag: v1.0.0-beta1~53^2~182
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=557d4cf2a2bb5b29c9e5d41774cd48918079becb;p=thirdparty%2Fknot-resolver.git

lib/cache: RRSIG RRsets have a separate cache storing mechanism
---

diff --git a/lib/cache.c b/lib/cache.c
index afc3eba67..9c1102f75 100644
--- a/lib/cache.c
+++ b/lib/cache.c
@@ -320,3 +320,50 @@ int kr_cache_insert_rr(struct kr_cache_txn *txn, const knot_rrset_t *rr, uint32_
 	namedb_val_t data = { rr->rrs.data, knot_rdataset_size(&rr->rrs) };
 	return kr_cache_insert(txn, KR_CACHE_RR, rr->owner, rr->type, &header, data);
 }
+
+int kr_cache_peek_rrsig(struct kr_cache_txn *txn, knot_rrset_t *rr, uint32_t *timestamp)
+{
+	if (!txn || !rr || !timestamp) {
+		return kr_error(EINVAL);
+	}
+
+	/* Check if the RRSet is in the cache. */
+	struct kr_cache_entry *entry = kr_cache_peek(txn, KR_CACHE_RRSIG, rr->owner, rr->type, timestamp);
+	if (entry) {
+		rr->type = KNOT_RRTYPE_RRSIG;
+		rr->rrs.rr_count = entry->count;
+		rr->rrs.data = entry->data;
+		return kr_ok();
+	}
+
+	/* Not found. */
+	return kr_error(ENOENT);
+}
+
+int kr_cache_insert_rrsig(struct kr_cache_txn *txn, const knot_rrset_t *rr, uint16_t typec, uint32_t timestamp)
+{
+	if (!txn || !rr) {
+		return kr_error(EINVAL);
+	}
+
+	/* Ignore empty records */
+	if (knot_rrset_empty(rr)) {
+		return kr_ok();
+	}
+
+	/* Prepare header to write */
+	struct kr_cache_entry header = {
+		.timestamp = timestamp,
+		.ttl = 0,
+		.count = rr->rrs.rr_count
+	};
+	for (uint16_t i = 0; i < rr->rrs.rr_count; ++i) {
+		knot_rdata_t *rd = knot_rdataset_at(&rr->rrs, i);
+		if (knot_rdata_ttl(rd) > header.ttl) {
+			header.ttl = knot_rdata_ttl(rd);
+		}
+	}
+
+	namedb_val_t data = { rr->rrs.data, knot_rdataset_size(&rr->rrs) };
+	return kr_cache_insert(txn, KR_CACHE_RRSIG, rr->owner, typec, &header, data);
+}
diff --git a/lib/cache.h b/lib/cache.h
index c26ab150f..7edd42169 100644
--- a/lib/cache.h
+++ b/lib/cache.h
@@ -24,6 +24,7 @@ enum kr_cache_tag {
 	KR_CACHE_RR   = 'R',
 	KR_CACHE_PKT  = 'P',
 	KR_CACHE_SEC  = 'S',
+	KR_CACHE_RRSIG = 'G',
 	KR_CACHE_USER = 0x80
 };
 
@@ -173,3 +174,24 @@ int kr_cache_materialize(knot_rrset_t *dst, const knot_rrset_t *src, uint32_t dr
  * @return 0 or an errcode
  */
 int kr_cache_insert_rr(struct kr_cache_txn *txn, const knot_rrset_t *rr, uint32_t timestamp);
+
+/**
+ * Peek the cache for the given RRset signature (name, type)
+ * @note The RRset type must not be RRSIG but instead it must equal the type covered field of the sought RRSIG.
+ * @param txn transaction instance
+ * @param rr query RRSET (its rdataset and type may be changed depending on the result)
+ * @param timestamp current time (will be replaced with drift if successful)
+ * @return 0 or an errcode
+ */
+int kr_cache_peek_rrsig(struct kr_cache_txn *txn, knot_rrset_t *rr, uint32_t *timestamp);
+
+/**
+ * Insert the selected RRSIG RRSet of the selected type covered into cache, replacing any existing data.
+ * @note The RRSet must contain RRSIGS with only the specified type covered.
+ * @param txn transaction instance
+ * @param rr inserted RRSIG RRSet
+ * @param typec type covered of the RDATA
+ * @param timestamp current time
+ * @return 0 or an errcode
+ */
+int kr_cache_insert_rrsig(struct kr_cache_txn *txn, const knot_rrset_t *rr, uint16_t typec, uint32_t timestamp);