conf: add local-ttl option

ReadMe.md

@@ -563,6 +563,7 @@ rtt min/avg/max/mdev = 5.954/6.133/6.313/0.195 ms
 | rr-ttl-min | 允许的最小 TTL 值 | 远程查询结果 | 大于 0 的数字 | rr-ttl-min 60 |
 | rr-ttl-max | 允许的最大 TTL 值 | 远程查询结果 | 大于 0 的数字 | rr-ttl-max 600 |
 | rr-ttl-reply-max | 允许返回给客户端的最大 TTL 值 | 远程查询结果 | 大于 0 的数字 | rr-ttl-reply-max 60 |
+| local-ttl | 本地HOST，address的TTL值 | rr-ttl-min | 大于 0 的数字 | local-ttl  60 |
 | max-reply-ip-num | 允许返回给客户的最大IP数量 | IP数量 | 大于 0 的数字 | max-reply-ip-num 1 |
 | log-level | 设置日志级别 | error | fatal、error、warn、notice、info 或 debug | log-level error |
 | log-file | 日志文件路径 | /var/log/smartdns/smartdns.log | 合法路径字符串 | log-file /var/log/smartdns/smartdns.log |

ReadMe_en.md

@@ -497,6 +497,7 @@ Note: Merlin firmware is derived from ASUS firmware and can theoretically be use
 |tcp-idle-time|TCP connection idle timeout|120|integer|tcp-idle-time 120
 |rr-ttl|Domain name TTL|Remote query result|number greater than 0|rr-ttl 600
 |rr-ttl-min|Domain name Minimum TTL|Remote query result|number greater than 0|rr-ttl-min 60
+|local-ttl|ttl for address and host|rr-ttl-min|number greater than 0|local-ttl 600
 |rr-ttl-reply-max|Domain name Minimum Reply TTL|Remote query result|number greater than 0|rr-ttl-reply-max 60
 |rr-ttl-max|Domain name Maximum TTL|Remote query result|number greater than 0|rr-ttl-max 600
 |max-reply-ip-num|Maximum number of IPs returned to the client|8|number of IPs, 1~16 |max-reply-ip-num 1

src/dns_conf.c

@@ -124,6 +124,7 @@ int dns_conf_rr_ttl;
 int dns_conf_rr_ttl_reply_max;
 int dns_conf_rr_ttl_min = 600;
 int dns_conf_rr_ttl_max;
+int dns_conf_local_ttl;
 int dns_conf_force_AAAA_SOA;
 int dns_conf_force_no_cname;
 int dns_conf_ipset_timeout_enable;
@@ -1907,6 +1908,7 @@ static struct config_item _config_item[] = {
 	CONF_INT("rr-ttl-min", &dns_conf_rr_ttl_min, 0, CONF_INT_MAX),
 	CONF_INT("rr-ttl-max", &dns_conf_rr_ttl_max, 0, CONF_INT_MAX),
 	CONF_INT("rr-ttl-reply-max", &dns_conf_rr_ttl_reply_max, 0, CONF_INT_MAX),
+	CONF_INT("local-ttl", &dns_conf_local_ttl, 0, CONF_INT_MAX),
 	CONF_INT("max-reply-ip-num", &dns_conf_max_reply_ip_num, 1, CONF_INT_MAX),
 	CONF_ENUM("response-mode", &dns_conf_response_mode, &dns_conf_response_mode_enum),
 	CONF_YESNO("force-AAAA-SOA", &dns_conf_force_AAAA_SOA),
@@ -2091,6 +2093,10 @@ static int _dns_conf_load_post(void)
 			 dns_conf_response_mode_enum[dns_conf_response_mode].name);
 	}
 
+	if (dns_conf_local_ttl == 0) {
+		dns_conf_local_ttl = dns_conf_rr_ttl_min;
+	}
+
 	return 0;
 }
 

src/dns_conf.h

@@ -312,6 +312,7 @@ extern int dns_conf_rr_ttl_min;
 extern int dns_conf_rr_ttl_max;
 extern int dns_conf_force_AAAA_SOA;
 extern int dns_conf_ipset_timeout_enable;
+extern int dns_conf_local_ttl;
 
 extern int dns_conf_force_no_cname;
 

src/dns_server.c

@@ -3413,7 +3413,7 @@ static int _dns_server_process_address(struct dns_request *request)
 	}
 
 	request->rcode = DNS_RC_NOERROR;
-	request->ip_ttl = 600;
+	request->ip_ttl = dns_conf_local_ttl;
 	request->has_ip = 1;
 
 	struct dns_server_post_context context;
@@ -3934,7 +3934,7 @@ static int _dns_server_process_host(struct dns_request *request)
 	}
 
 	request->rcode = DNS_RC_NOERROR;
-	request->ip_ttl = 600;
+	request->ip_ttl = dns_conf_local_ttl;
 	request->has_ip = 1;
 
 	struct dns_server_post_context context;
@@ -4040,9 +4040,6 @@ static int _dns_server_do_query(struct dns_request *request)
 		safe_strncpy(request->dns_group_name, group_name, DNS_GROUP_NAME_LEN);
 	}
 
-	if (_dns_server_process_host(request) == 0) {
-		goto clean_exit;
-	}
 
 	_dns_server_set_dualstack_selection(request);
 
@@ -4060,6 +4057,10 @@ static int _dns_server_do_query(struct dns_request *request)
 		goto clean_exit;
 	}
 
+	if (_dns_server_process_host(request) == 0) {
+		goto clean_exit;
+	}
+
 	/* process qtype soa */
 	if (_dns_server_qtype_soa(request) == 0) {
 		goto clean_exit;