Display resolver ip in dnswatch detailed

Summary: It's useful information to have in detailed view

Reviewed By: abulimov

Differential Revision: D48227773

fbshipit-source-id: a2bf5e9cd4c7e980e61eccc0e27762a5613c6e97

dnswatch/snoop/printer.go

@@ -193,6 +193,7 @@ func (d *DisplayInfo) DetailedString() string {
 	s += ";; opcode: " + dnsPkt.OpCode.String()
 	s += ", status: " + dnsPkt.ResponseCode.String()
 	s += ", id: " + strconv.Itoa(int(dnsPkt.ID)) + "\n"
+	s += ";; resolver ip: " + d.responseAddr.String() + "\n"
 
 	s += ";; flags:"
 	if dnsPkt.QR {

dnswatch/snoop/printer_test.go

@@ -117,15 +117,15 @@ func TestDisplayInfoString(t *testing.T) {
 	require.Equal(t, "true,", res[8])
 	require.Equal(t, "V2Random", res[5])
 	require.Equal(t, "10", res[12])
-	require.Equal(t, "QUERY:", res[23])
-	require.Equal(t, "1,", res[24])
-	require.Equal(t, "ANSWER:", res[25])
-	require.Equal(t, "1,", res[26])
-	require.Equal(t, "AUTHORITY:", res[27])
-	require.Equal(t, "0,", res[28])
-	require.Equal(t, "ADDITIONAL:", res[29])
-	require.Equal(t, "0", res[30])
-	require.Equal(t, ";question.name", res[34])
+	require.Equal(t, "QUERY:", res[27])
+	require.Equal(t, "1,", res[28])
+	require.Equal(t, "ANSWER:", res[29])
+	require.Equal(t, "1,", res[30])
+	require.Equal(t, "AUTHORITY:", res[31])
+	require.Equal(t, "0,", res[32])
+	require.Equal(t, "ADDITIONAL:", res[33])
+	require.Equal(t, "0", res[34])
+	require.Equal(t, ";question.name", res[38])
 
 	d.query = nil
 	res = strings.Fields(d.DetailedString())