From 0e6eeefe5e378966dc86645f07a1f6a7cb714e54 Mon Sep 17 00:00:00 2001
From: Nick Peng <pymumu@gmail.com>
Date: Wed, 12 Apr 2023 23:14:10 +0800
Subject: [PATCH] dns_server: suppress error log

---
 src/dns_client.c |  8 +++++++-
 src/dns_conf.c   | 15 +++++++++++++++
 src/dns_server.c |  4 ++--
 3 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/src/dns_client.c b/src/dns_client.c
index 68e5b92..87b258c 100644
--- a/src/dns_client.c
+++ b/src/dns_client.c
@@ -3562,7 +3562,13 @@ static int _dns_client_send_packet(struct dns_query_struct *query, void *packet,
 	}
 
 	if (send_count <= 0) {
-		tlog(TLOG_WARN, "Send query to upstream server failed, total server number %d", total_server);
+		static time_t lastlog = 0;
+		time_t now = 0;
+		time(&now);
+		if (now - lastlog > 120) {
+			lastlog = now;
+			tlog(TLOG_WARN, "Send query %s to upstream server failed, total server number %d", query->domain, total_server);
+		}
 		return -1;
 	}
 
diff --git a/src/dns_conf.c b/src/dns_conf.c
index 9a9bb92..b6c331a 100644
--- a/src/dns_conf.c
+++ b/src/dns_conf.c
@@ -3393,6 +3393,19 @@ void dns_server_load_exit(void)
 	_config_proxy_table_destroy();
 
 	dns_conf_server_num = 0;
+	dns_conf_bind_ip_num = 0;
+}
+
+static int _config_add_default_server_if_needed(void)
+{
+	if (dns_conf_bind_ip_num > 0) {
+		return 0;
+	}
+
+	/* add default server */
+	char *argv[] = {"bind", "[::]:53", 0};
+	int argc = sizeof(argv) / sizeof(char *) - 1;
+	return _config_bind_ip(argc, argv, DNS_BIND_TYPE_UDP);
 }
 
 static int _dns_conf_speed_check_mode_verify(void)
@@ -3513,6 +3526,8 @@ static int _dns_conf_load_post(void)
 
 	_config_update_bootstrap_dns_rule();
 
+	_config_add_default_server_if_needed();
+
 	return 0;
 }
 
diff --git a/src/dns_server.c b/src/dns_server.c
index 77557cf..7e677e3 100644
--- a/src/dns_server.c
+++ b/src/dns_server.c
@@ -5293,7 +5293,7 @@ static int _dns_server_recv(struct dns_server_conn_head *conn, unsigned char *in
 
 	ret = _dns_server_do_query(request, 1);
 	if (ret != 0) {
-		tlog(TLOG_WARN, "do query %s failed.\n", request->domain);
+		tlog(TLOG_DEBUG, "do query %s failed.\n", request->domain);
 		goto errout;
 	}
 	_dns_server_request_release_complete(request, 0);
@@ -6168,7 +6168,7 @@ static void _dns_server_prefetch_expired_domain(struct dns_cache *dns_cache)
 	server_query_option.ecs_enable_flag = 0;
 
 	if (_dns_server_prefetch_request(dns_cache->info.domain, dns_cache->info.qtype, 1, &server_query_option) != 0) {
-		tlog(TLOG_WARN, "prefetch domain %s, qtype %d, failed.", dns_cache->info.domain, dns_cache->info.qtype);
+		tlog(TLOG_DEBUG, "prefetch domain %s, qtype %d, failed.", dns_cache->info.domain, dns_cache->info.qtype);
 	}
 }