feature: support set ttl, ttl-min, ttl-max to domain.

src/dns_conf.h

@@ -75,6 +75,7 @@ enum domain_rule {
 	DOMAIN_RULE_NAMESERVER,
 	DOMAIN_RULE_CHECKSPEED,
 	DOMAIN_RULE_CNAME,
+	DOMAIN_RULE_TTL,
 	DOMAIN_RULE_MAX,
 };
 
@@ -164,6 +165,13 @@ struct dns_cname_rule {
 	char cname[DNS_MAX_CNAME_LEN];
 };
 
+struct dns_ttl_rule {
+	struct dns_rule head;
+	int ttl;
+	int ttl_max;
+	int ttl_min;
+};
+
 struct dns_nftset_name {
 	struct hlist_node node;
 	char nftfamilyname[DNS_MAX_NFTSET_FAMILYLEN];