[2521] DHCDID RDATA cannot be empty

src/lib/dns/rdata/in_1/dhcid_49.cc

@@ -48,10 +48,11 @@ DHCID::constructFromLexer(MasterLexer& lexer) {
     }
     lexer.ungetToken();
 
-    // missing digest data is okay
-    if (digest_txt.size() > 0) {
-        decodeBase64(digest_txt, digest_);
+    if (digest_txt.size() == 0) {
+        isc_throw(InvalidRdataText, "Missing DHCID RDATA");
     }
+
+    decodeBase64(digest_txt, digest_);
 }
 
 /// \brief Constructor from string.
@@ -89,7 +90,9 @@ DHCID::DHCID(const std::string& dhcid_str) {
 /// The \c lexer should point to the beginning of valid textual representation
 /// of a DHCID RDATA.
 ///
-/// \throw MasterLexer::LexerError General parsing error such as missing field.
+/// \throw InvalidRdataText on empty string.
+/// \throw BadValue if the text is not valid base-64.
+/// \throw MasterLexer::LexerError General parsing error.
 ///
 /// \param lexer A \c MasterLexer object parsing a master file for the
 /// RDATA to be created

src/lib/dns/tests/rdata_dhcid_unittest.cc

@@ -45,8 +45,8 @@ protected:
             rdata_str, rdata_dhcid, false, false);
     }
 
-    void checkFromText_InvalidLength(const string& rdata_str) {
-        checkFromText<in::DHCID, InvalidRdataLength, InvalidRdataLength>(
+    void checkFromText_InvalidText(const string& rdata_str) {
+        checkFromText<in::DHCID, InvalidRdataText, InvalidRdataText>(
             rdata_str, rdata_dhcid, true, true);
     }
 
@@ -74,9 +74,6 @@ protected:
 TEST_F(Rdata_DHCID_Test, fromText) {
     EXPECT_EQ(dhcid_txt, rdata_dhcid.toText());
 
-    // missing digest data is okay
-    EXPECT_NO_THROW(const in::DHCID digest(""));
-
     // Space in digest data is OK
     checkFromText_None(
             "0LIg0LvQtdGB0YMg 0YDQvtC00LjQu9Cw 0YHRjCDRkdC70L7R h9C60LA=");
@@ -95,6 +92,10 @@ TEST_F(Rdata_DHCID_Test, fromText) {
 }
 
 TEST_F(Rdata_DHCID_Test, badText) {
+    // missing digest data
+    checkFromText_InvalidText("");
+
+    // invalid base64
     checkFromText_BadValue("EEeeeeeeEEEeeeeeeGaaahAAAAAAAAHHHHHHHHHHH!=");
 
     // unterminated multi-line base64