fix dns

src/dns_proxy/dns_resolver.erl

@@ -53,7 +53,7 @@ resolve(IpPacket) when is_binary(IpPacket) ->
 resolve0(QueryMsg = #dns_message{qc = 1, questions = [#dns_query{name = QName, type = QType, class = QClass}|_]}) ->
     %% 查找是否是内置的域名
     case sdlan_hostname_regedit:lookup(QName) of
-        {ok, Ip} ->
+        {ok, Ip} when QType =:= ?DNS_TYPE_A, QClass =:= ?DNS_CLASS_IN ->
             Answer = #dns_rr {
                 name = QName,
                 type = QType,
@@ -75,6 +75,8 @@ resolve0(QueryMsg = #dns_message{qc = 1, questions = [#dns_query{name = QName, t
             },
             logger:debug("[dns_resolver] punchnet inbuilt qnanme: ~p, ip: ~p", [QName, Ip]),
             {ok, dns:encode_message(RespMsg)};
+        {ok, _Ip} ->
+            {ok, dns:encode_message(build_empty_response(QueryMsg))};
         error ->
             case sdlan_domain_regedit:maybe_domain(QName) of
                 true ->
@@ -87,6 +89,21 @@ resolve0(QueryMsg = #dns_message{qc = 1, questions = [#dns_query{name = QName, t
 resolve0(Error) ->
     {error, Error}.
 
+-spec build_empty_response(QueryMsg :: #dns_message{}) -> EmptyResp :: #dns_message{}.
+build_empty_response(QueryMsg) ->
+    QueryMsg#dns_message{
+        qr = true,
+        aa = true,
+        ra = true,
+        rc = ?DNS_RCODE_NOERROR,
+        anc = 0,
+        auc = 0,
+        adc = 0,
+        answers = [],
+        authority = [],
+        additional = []
+    }.
+
 -spec build_nxdomain_response(QueryMsg :: #dns_message{}) -> EmptyResp :: #dns_message{}.
 build_nxdomain_response(QueryMsg) ->
     QueryMsg#dns_message{
@@ -127,4 +144,4 @@ build_ip_packet(SAddr, DAddr, SPort, DPort, UdpPayload) when is_integer(SPort),
     IpCheckSum = dns_utils:ip_checksum(IpPacket0),
     IpHeader = pkt:ipv4(IpPacket0#ipv4{sum = IpCheckSum}),
 
-    <<IpHeader/binary, IpPayload/binary>>.
+    <<IpHeader/binary, IpPayload/binary>>.