ip-alias: add option -no-ipalias for domain-rules

etc/smartdns/smartdns.conf

@@ -310,6 +310,8 @@ log-level info
 #   [-d] -dualstack-ip-selection [yes|no]: same as dualstack-ip-selection option
 #   -no-serve-expired: ignore expired domain
 #   -delete: delete domain rule
+#   -no-ip-alias: ignore ip alias
+#   -no-cache: ignore cache
 
 # collection of domains 
 # the domain-set can be used with /domain/ for address, nameserver, ipset, etc.

src/dns_conf.c

@@ -3031,6 +3031,11 @@ static int _conf_domain_rule_no_cache(const char *domain)
 	return _config_domain_rule_flag_set(domain, DOMAIN_FLAG_NO_CACHE, 0);
 }
 
+static int _conf_domain_rule_no_ipalias(const char *domain)
+{
+	return _config_domain_rule_flag_set(domain, DOMAIN_FLAG_NO_IPALIAS, 0);
+}
+
 static int _conf_domain_rules(void *data, int argc, char *argv[])
 {
 	int opt = 0;
@@ -3056,6 +3061,7 @@ static int _conf_domain_rules(void *data, int argc, char *argv[])
 		{"no-serve-expired", no_argument, NULL, 254},
 		{"delete", no_argument, NULL, 255},
 		{"no-cache", no_argument, NULL, 256},
+		{"no-ip-alias", no_argument, NULL, 257},
 		{NULL, no_argument, NULL, 0}
 	};
 	/* clang-format on */
@@ -3211,6 +3217,14 @@ static int _conf_domain_rules(void *data, int argc, char *argv[])
 
 			break;
 		}
+		case 257: {
+			if (_conf_domain_rule_no_ipalias(domain) != 0) {
+				tlog(TLOG_ERROR, "set no-ipalias rule failed.");
+				goto errout;
+			}
+
+			break;
+		}
 		default:
 			break;
 		}

src/dns_conf.h

@@ -117,6 +117,7 @@ typedef enum {
 #define DOMAIN_FLAG_NO_SERVE_EXPIRED (1 << 15)
 #define DOMAIN_FLAG_CNAME_IGN (1 << 16)
 #define DOMAIN_FLAG_NO_CACHE (1 << 17)
+#define DOMAIN_FLAG_NO_IPALIAS (1 << 18)
 
 #define SERVER_FLAG_EXCLUDE_DEFAULT (1 << 0)
 #define SERVER_FLAG_HITCHHIKING (1 << 1)

src/dns_server.c

@@ -321,6 +321,7 @@ struct dns_request {
 	int no_select_possible_ip;
 	int no_cache_cname;
 	int no_cache;
+	int no_ipalias;
 
 	int has_cname_loop;
 };
@@ -2862,9 +2863,11 @@ static int _dns_server_process_ip_rule(struct dns_request *request, unsigned cha
 	}
 
 	if (rule->ip_alias_enable && alias != NULL) {
-		*alias = rule->ip_alias;
+		if (request->no_ipalias == 0) {
-		if (alias == NULL) {
+			*alias = rule->ip_alias;
-			return 0;
+			if (alias == NULL) {
+				return 0;
+			}
 		}
 
 		/* need process ip alias */
@@ -4137,6 +4140,10 @@ static int _dns_server_pre_process_rule_flags(struct dns_request *request)
 		request->no_cache = 1;
 	}
 
+	if (flags & DOMAIN_FLAG_NO_IPALIAS) {
+		request->no_ipalias = 1;
+	}
+
 	if (flags & DOMAIN_FLAG_ADDR_IGN) {
 		/* ignore this domain */
 		goto skip_soa_out;

test/cases/test-ip-alias.cc

@@ -246,3 +246,73 @@ cache-persist no)""");
 	EXPECT_EQ(client.GetAnswer()[0].GetName(), "a.com");
 	EXPECT_EQ(client.GetAnswer()[0].GetData(), "ffff::1");
 }
+
+TEST(IPAlias, no_ip_alias)
+{
+	smartdns::MockServer server_upstream;
+	smartdns::Server server;
+
+	server_upstream.Start("udp://0.0.0.0:61053", [](struct smartdns::ServerRequestContext *request) {
+		std::string domain = request->domain;
+		if (request->domain.length() == 0) {
+			return smartdns::SERVER_REQUEST_ERROR;
+		}
+
+		if (request->qtype == DNS_T_A) {
+			unsigned char addr[][4] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}};
+			dns_add_A(request->response_packet, DNS_RRS_AN, domain.c_str(), 61, addr[0]);
+			dns_add_A(request->response_packet, DNS_RRS_AN, domain.c_str(), 61, addr[1]);
+			dns_add_A(request->response_packet, DNS_RRS_AN, domain.c_str(), 61, addr[2]);
+		} else if (request->qtype == DNS_T_AAAA) {
+			unsigned char addr[][16] = {{1, 2, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+										{5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+										{10, 11, 12, 13, 14, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}};
+			dns_add_AAAA(request->response_packet, DNS_RRS_AN, domain.c_str(), 61, addr[0]);
+			dns_add_AAAA(request->response_packet, DNS_RRS_AN, domain.c_str(), 61, addr[1]);
+			dns_add_AAAA(request->response_packet, DNS_RRS_AN, domain.c_str(), 61, addr[2]);
+		} else {
+			return smartdns::SERVER_REQUEST_ERROR;
+		}
+
+		request->response_packet->head.rcode = DNS_RC_NOERROR;
+		return smartdns::SERVER_REQUEST_OK;
+	});
+
+	server.MockPing(PING_TYPE_ICMP, "1.2.3.4", 60, 100);
+	server.MockPing(PING_TYPE_ICMP, "5.6.7.8", 60, 110);
+	server.MockPing(PING_TYPE_ICMP, "9.10.11.12", 60, 140);
+	server.MockPing(PING_TYPE_ICMP, "10.10.10.10", 60, 120);
+	server.MockPing(PING_TYPE_ICMP, "11.11.11.11", 60, 150);
+	server.MockPing(PING_TYPE_ICMP, "0102:0304:0500::", 60, 100);
+	server.MockPing(PING_TYPE_ICMP, "0506:0708:0900::", 60, 110);
+	server.MockPing(PING_TYPE_ICMP, "0a0b:0c0d:0e00::", 60, 140);
+	server.MockPing(PING_TYPE_ICMP, "ffff::1", 60, 120);
+	server.MockPing(PING_TYPE_ICMP, "ffff::2", 60, 150);
+
+	server.Start(R"""(bind [::]:60053
+server 127.0.0.1:61053
+log-num 0
+log-console yes
+log-level debug
+dualstack-ip-selection no
+ip-alias 1.2.3.4 10.10.10.10
+ip-alias 5.6.7.8/32 11.11.11.11
+ip-alias 0102::/16 ffff::1
+ip-alias 0506::/16 ffff::2
+domain-rules /a.com/ -no-ip-alias
+cache-persist no)""");
+	smartdns::Client client;
+	ASSERT_TRUE(client.Query("a.com", 60053));
+	std::cout << client.GetResult() << std::endl;
+	ASSERT_EQ(client.GetAnswerNum(), 1);
+	EXPECT_EQ(client.GetStatus(), "NOERROR");
+	EXPECT_EQ(client.GetAnswer()[0].GetName(), "a.com");
+	EXPECT_EQ(client.GetAnswer()[0].GetData(), "1.2.3.4");
+
+	ASSERT_TRUE(client.Query("a.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(), "a.com");
+	EXPECT_EQ(client.GetAnswer()[0].GetData(), "102:304:500::");
+}