conf: add ddns-domain options

etc/smartdns/smartdns.conf

@@ -291,6 +291,9 @@ log-level info
 # nftset /www.example.com/-, ignore this domain
 # nftset /www.example.com/#6:-, ignore ipv6
 
+# set ddns domain
+# ddns-domain domain
+
 # set domain rules
 # domain-rules /domain/ [-speed-check-mode [...]]
 # rules:

src/dns_conf.c

@@ -2839,6 +2839,18 @@ errout:
 	return -1;
 }
 
+static int _conf_ddns_domain(void *data, int argc, char *argv[])
+{
+	if (argc <= 1) {
+		tlog(TLOG_ERROR, "invalid parameter.");
+		return -1;
+	}
+
+	const char *domain = argv[1];
+	_config_domain_rule_flag_set(domain, DOMAIN_FLAG_SMARTDNS_DOMAIN, 0);
+	return 0;
+}
+
 static int _conf_domain_rule_rr_ttl(const char *domain, int ttl, int ttl_min, int ttl_max)
 {
 	struct dns_ttl_rule *rr_ttl = NULL;
@@ -3582,6 +3594,7 @@ static struct config_item _config_item[] = {
 	CONF_CUSTOM("edns-client-subnet", _conf_edns_client_subnet, NULL),
 	CONF_CUSTOM("domain-rules", _conf_domain_rules, NULL),
 	CONF_CUSTOM("domain-set", _conf_domain_set, NULL),
+	CONF_CUSTOM("ddns-domain", _conf_ddns_domain, NULL),
 	CONF_CUSTOM("dnsmasq-lease-file", _conf_dhcp_lease_dnsmasq_file, NULL),
 	CONF_CUSTOM("hosts-file", _conf_hosts_file, NULL),
 	CONF_STRING("ca-file", (char *)&dns_conf_ca_file, DNS_MAX_PATH),

src/dns_server.c

@@ -3630,6 +3630,10 @@ static int _dns_server_get_inet_by_addr(struct sockaddr_storage *localaddr, stru
 		break;
 	}
 
+	if (ifa == NULL) {
+		goto errout;
+	}
+
 	freeifaddrs(ifaddr);
 	return 0;
 errout:
@@ -6175,7 +6179,9 @@ static int _dns_server_process_tls(struct dns_server_conn_tls_client *tls_client
 			} else {
 				unsigned long ssl_err = ERR_get_error();
 				int ssl_reason = ERR_GET_REASON(ssl_err);
-				tlog(TLOG_DEBUG, "Handshake with %s failed, error no: %s(%d, %d, %d)\n", "",
+				char name[DNS_MAX_CNAME_LEN];
+				tlog(TLOG_DEBUG, "Handshake with %s failed, error no: %s(%d, %d, %d)\n",
+					 get_host_by_addr(name, sizeof(name), (struct sockaddr *)&tls_client->addr),
 					 ERR_reason_error_string(ssl_err), ret, ssl_ret, ssl_reason);
 				ret = 0;
 				goto errout;

test/cases/test-ddns.cc

@@ -0,0 +1,124 @@
+/*************************************************************************
+ *
+ * Copyright (C) 2018-2023 Ruilin Peng (Nick) <pymumu@gmail.com>.
+ *
+ * smartdns 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.
+ *
+ * smartdns 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "client.h"
+#include "dns.h"
+#include "include/utils.h"
+#include "server.h"
+#include "util.h"
+#include "gtest/gtest.h"
+#include <fstream>
+
+class DDNS : public ::testing::Test
+{
+  protected:
+	virtual void SetUp() {}
+	virtual void TearDown() {}
+};
+
+TEST_F(DDNS, smartdns)
+{
+	smartdns::MockServer server_upstream;
+	smartdns::Server server;
+
+	server_upstream.Start("udp://0.0.0.0:61053", [&](struct smartdns::ServerRequestContext *request) {
+		return smartdns::SERVER_REQUEST_SOA;
+	});
+
+	server.Start(R"""(bind [::]:60053
+server 127.0.0.1:61053
+log-num 0
+log-console yes
+dualstack-ip-selection no
+log-level debug
+cache-persist no)""");
+	smartdns::Client client;
+	ASSERT_TRUE(client.Query("smartdns A", 60053));
+	std::cout << client.GetResult() << std::endl;
+	ASSERT_EQ(client.GetAnswerNum(), 1);
+	EXPECT_EQ(client.GetStatus(), "NOERROR");
+	EXPECT_EQ(client.GetAnswer()[0].GetName(), "smartdns");
+	EXPECT_EQ(client.GetAnswer()[0].GetTTL(), 600);
+	EXPECT_EQ(client.GetAnswer()[0].GetType(), "A");
+	EXPECT_EQ(client.GetAnswer()[0].GetData(), "127.0.0.1");
+
+	ASSERT_TRUE(client.Query("smartdns AAAA", 60053));
+	std::cout << client.GetResult() << std::endl;
+	ASSERT_EQ(client.GetAnswerNum(), 1);
+	EXPECT_EQ(client.GetStatus(), "NOERROR");
+	EXPECT_EQ(client.GetAnswer()[0].GetName(), "smartdns");
+	EXPECT_EQ(client.GetAnswer()[0].GetTTL(), 600);
+	EXPECT_EQ(client.GetAnswer()[0].GetType(), "AAAA");
+	EXPECT_EQ(client.GetAnswer()[0].GetData(), "::1");
+}
+
+TEST_F(DDNS, ddns)
+{
+	smartdns::MockServer server_upstream;
+	smartdns::Server server;
+
+	server_upstream.Start("udp://0.0.0.0:61053", [&](struct smartdns::ServerRequestContext *request) {
+		return smartdns::SERVER_REQUEST_SOA;
+	});
+
+	server.Start(R"""(bind [::]:60053
+server 127.0.0.1:61053
+log-num 0
+ddns-domain test.ddns.com
+ddns-domain test.ddns.org
+log-console yes
+dualstack-ip-selection no
+log-level debug
+cache-persist no)""");
+	smartdns::Client client;
+	ASSERT_TRUE(client.Query("test.ddns.com A", 60053));
+	std::cout << client.GetResult() << std::endl;
+	ASSERT_EQ(client.GetAnswerNum(), 1);
+	EXPECT_EQ(client.GetStatus(), "NOERROR");
+	EXPECT_EQ(client.GetAnswer()[0].GetName(), "test.ddns.com");
+	EXPECT_EQ(client.GetAnswer()[0].GetTTL(), 600);
+	EXPECT_EQ(client.GetAnswer()[0].GetType(), "A");
+	EXPECT_EQ(client.GetAnswer()[0].GetData(), "127.0.0.1");
+
+	ASSERT_TRUE(client.Query("test.ddns.com AAAA", 60053));
+	std::cout << client.GetResult() << std::endl;
+	ASSERT_EQ(client.GetAnswerNum(), 1);
+	EXPECT_EQ(client.GetStatus(), "NOERROR");
+	EXPECT_EQ(client.GetAnswer()[0].GetName(), "test.ddns.com");
+	EXPECT_EQ(client.GetAnswer()[0].GetTTL(), 600);
+	EXPECT_EQ(client.GetAnswer()[0].GetType(), "AAAA");
+	EXPECT_EQ(client.GetAnswer()[0].GetData(), "::1");
+
+	ASSERT_TRUE(client.Query("test.ddns.org A", 60053));
+	std::cout << client.GetResult() << std::endl;
+	ASSERT_EQ(client.GetAnswerNum(), 1);
+	EXPECT_EQ(client.GetStatus(), "NOERROR");
+	EXPECT_EQ(client.GetAnswer()[0].GetName(), "test.ddns.org");
+	EXPECT_EQ(client.GetAnswer()[0].GetTTL(), 600);
+	EXPECT_EQ(client.GetAnswer()[0].GetType(), "A");
+	EXPECT_EQ(client.GetAnswer()[0].GetData(), "127.0.0.1");
+
+	ASSERT_TRUE(client.Query("test.ddns.org AAAA", 60053));
+	std::cout << client.GetResult() << std::endl;
+	ASSERT_EQ(client.GetAnswerNum(), 1);
+	EXPECT_EQ(client.GetStatus(), "NOERROR");
+	EXPECT_EQ(client.GetAnswer()[0].GetName(), "test.ddns.org");
+	EXPECT_EQ(client.GetAnswer()[0].GetTTL(), 600);
+	EXPECT_EQ(client.GetAnswer()[0].GetType(), "AAAA");
+	EXPECT_EQ(client.GetAnswer()[0].GetData(), "::1");
+}