feat(client): Add support for PTR DNS records (#886)

Co-authored-by: TwiN <[email protected]>

Author: d7415

client/client.go

@@ -321,6 +321,10 @@ func QueryDNS(queryType, queryName, url string) (connected bool, dnsRcode string
 			if ns, ok := rr.(*dns.NS); ok {
 				body = []byte(ns.Ns)
 			}
+		case dns.TypePTR:
+			if ptr, ok := rr.(*dns.PTR); ok {
+				body = []byte(ptr.Ptr)
+			}
 		default:
 			body = []byte("query type is not supported yet")
 		}

client/client_test.go

@@ -396,6 +396,16 @@ func TestQueryDNS(t *testing.T) {
 			expectedDNSCode: "NOERROR",
 			expectedBody:    "*.iana-servers.net.",
 		},
+		{
+			name: "test Config with type PTR",
+			inputDNS: dns.Config{
+				QueryType: "PTR",
+				QueryName: "8.8.8.8.in-addr.arpa.",
+			},
+			inputURL:        "8.8.8.8",
+			expectedDNSCode: "NOERROR",
+			expectedBody:    "dns.google.",
+		},
 		{
 			name: "test Config with fake type and retrieve error",
 			inputDNS: dns.Config{