static void ipv4_and_ipv6_dns_server(void) {
	struct addrinfo *ai;
	int timeout;
	endpoint_t *client;
	const char *nameservers[]={
		"8.8.8.8",
		"2a01:e00::2",
		NULL
	};
	
	if (!belle_sip_tester_ipv6_available()){
		belle_sip_warning("Test skipped, IPv6 connectivity not available.");
		return;
	}
	client = create_endpoint();
	CU_ASSERT_PTR_NOT_NULL_FATAL(client);
	timeout = belle_sip_stack_get_dns_timeout(client->stack);
	set_custom_resolv_conf(client->stack,nameservers);
	client->resolver_ctx = belle_sip_stack_resolve_a(client->stack, IPV4_SIP_DOMAIN, SIP_PORT, AF_INET, a_resolve_done, client);
	CU_ASSERT_NOT_EQUAL(client->resolver_ctx, NULL);
	CU_ASSERT_TRUE(wait_for(client->stack, &client->resolve_done, 1, timeout));
	CU_ASSERT_PTR_NOT_EQUAL(client->ai_list, NULL);
	if (client->ai_list) {
		struct sockaddr_in *sock_in = (struct sockaddr_in *)client->ai_list->ai_addr;
		CU_ASSERT_EQUAL(ntohs(sock_in->sin_port), SIP_PORT);
		ai = belle_sip_ip_address_to_addrinfo(AF_INET, IPV4_SIP_IP, SIP_PORT);
		if (ai) {
			CU_ASSERT_EQUAL(sock_in->sin_addr.s_addr, ((struct sockaddr_in *)ai->ai_addr)->sin_addr.s_addr);
			belle_sip_freeaddrinfo(ai);
		}
	}

	destroy_endpoint(client);
}
static void register_tcp_test_ipv6_to_ipv6_with_ipv6(void){
	if (!belle_sip_tester_ipv6_available()){
		belle_sip_warning("Test skipped, IPv6 connectivity not available.");
		return;
	}
	register_test_with_interfaces("tcp","::0","::0",AF_INET6);
}
static void register_tcp_test_ipv6_random_port(void){
	if (!belle_sip_tester_ipv6_available()){
		belle_sip_warning("Test skipped, IPv6 connectivity not available.");
		return;
	}
	register_test_with_random_port("tcp","::0","0.0.0.0",AF_INET);
}
/* Successful IPv6 AAAA query */
static void ipv6_aaaa_query(void) {
	struct addrinfo *ai;
	int timeout;
	endpoint_t *client;

	if (!belle_sip_tester_ipv6_available()){
		belle_sip_warning("Test skipped, IPv6 connectivity not available.");
		return;
	}

	client = create_endpoint();
	if (!BC_ASSERT_PTR_NOT_NULL(client)) return;
	timeout = belle_sip_stack_get_dns_timeout(client->stack);
	client->resolver_ctx = belle_sip_stack_resolve_a(client->stack, IPV6_SIP_DOMAIN, SIP_PORT, AF_INET6, a_resolve_done, client);
	BC_ASSERT_PTR_NOT_NULL(client->resolver_ctx);
	BC_ASSERT_TRUE(wait_for(client->stack, &client->resolve_done, 1, timeout));
	BC_ASSERT_PTR_NOT_EQUAL(client->ai_list, NULL);
	if (client->ai_list) {
		struct addrinfo *next;
		struct sockaddr_in6 *sock_in6 = (struct sockaddr_in6 *)client->ai_list->ai_addr;
		int ntohsi = ntohs(sock_in6->sin6_port);
		BC_ASSERT_EQUAL(ntohsi, SIP_PORT, int, "%d");
		/*the IPv6 address shall return first, and must be a real ipv6 address*/
		BC_ASSERT_EQUAL(client->ai_list->ai_family,AF_INET6,int,"%d");
		BC_ASSERT_FALSE(IN6_IS_ADDR_V4MAPPED(&sock_in6->sin6_addr));
		ai = bctbx_ip_address_to_addrinfo(AF_INET6, SOCK_STREAM, IPV6_SIP_IP, SIP_PORT);
		BC_ASSERT_PTR_NOT_NULL(ai);
		if (ai) {
			struct in6_addr *ipv6_address = &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr;
			int i;
			for (i = 0; i < 8; i++) {
				BC_ASSERT_EQUAL(sock_in6->sin6_addr.s6_addr[i], ipv6_address->s6_addr[i], int, "%d");
			}
			bctbx_freeaddrinfo(ai);
		}
		next=client->ai_list->ai_next;
		BC_ASSERT_PTR_NOT_NULL(next);
		if (next){
			int ntohsi = ntohs(sock_in6->sin6_port);
			sock_in6 = (struct sockaddr_in6 *)next->ai_addr;
			BC_ASSERT_EQUAL(next->ai_family,AF_INET6,int,"%d");
			BC_ASSERT_TRUE(IN6_IS_ADDR_V4MAPPED(&sock_in6->sin6_addr));
			BC_ASSERT_EQUAL(ntohsi, SIP_PORT, int, "%d");
			ai = bctbx_ip_address_to_addrinfo(AF_INET6, SOCK_STREAM, IPV6_SIP_IPV4, SIP_PORT);
			BC_ASSERT_PTR_NOT_NULL(ai);
			if (ai) {
				struct in6_addr *ipv6_address = &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr;
				int i;
				for (i = 0; i < 8; i++) {
					BC_ASSERT_EQUAL(sock_in6->sin6_addr.s6_addr[i], ipv6_address->s6_addr[i], int, "%d");
				}
				bctbx_freeaddrinfo(ai);
			}
		}
	}
	destroy_endpoint(client);
}
static void ipv4_a_query_with_v4mapped_results(void) {
	int timeout;
	endpoint_t *client;

	if (!belle_sip_tester_ipv6_available()){
		belle_sip_warning("Test skipped, IPv6 connectivity not available.");
		return;
	}

	client = create_endpoint();

	CU_ASSERT_PTR_NOT_NULL_FATAL(client);
	timeout = belle_sip_stack_get_dns_timeout(client->stack);
	client->resolver_ctx = belle_sip_stack_resolve_a(client->stack, IPV4_SIP_DOMAIN, SIP_PORT, AF_INET6, a_resolve_done, client);
	CU_ASSERT_NOT_EQUAL(client->resolver_ctx, NULL);
	CU_ASSERT_TRUE(wait_for(client->stack, &client->resolve_done, 1, timeout));
	CU_ASSERT_PTR_NOT_NULL(client->ai_list);

	destroy_endpoint(client);
}