[2521] Handle space-separated base-64 digest in DHCID, per Jinmei's review.

Also added more DHCID base-64 unittest cases.

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

@@ -33,8 +33,15 @@ using namespace isc::util::encode;
 
 void
 DHCID::createFromLexer(MasterLexer& lexer) {
-    const string digest_txt =
-        lexer.getNextToken(MasterToken::STRING).getString();
+    string digest_txt = lexer.getNextToken(MasterToken::STRING).getString();
+    while (true) {
+        const MasterToken& token = lexer.getNextToken();
+        if (token.getType() != MasterToken::STRING) {
+            break;
+        }
+        digest_txt.append(token.getString());
+    }
+    lexer.ungetToken();
     decodeBase64(digest_txt, digest_);
 
     // RFC4701 states DNS software should consider the RDATA section to
@@ -67,13 +74,12 @@ DHCID::DHCID(const std::string& dhcid_str) {
         std::istringstream iss(dhcid_str);
         MasterLexer lexer;
         lexer.pushSource(iss);
-
-	createFromLexer(lexer);
-
-        if (lexer.getNextToken().getType() != MasterToken::END_OF_FILE) {
-            isc_throw(InvalidRdataText, "extra input text for DHCID: "
-                      << dhcid_str);
-        }
+        createFromLexer(lexer);
+        // RFC4701 says we have to support white-space-separated substrings,
+        // so we have to read to the end of input. Therefore, we can't detect
+        // extra input past the end of the digest. OTOH, extra text is likely
+        // to result in a base64 decoding error, so BadValue will be thrown in
+        // that case.
     } catch (const MasterLexer::LexerError& ex) {
         isc_throw(InvalidRdataText, "Failed to construct DHCID from '" <<
                   dhcid_str << "': " << ex.what());

src/lib/dns/tests/rdata_dhcid_unittest.cc

-// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+// Copyright (C) 2011-2013  Internet Systems Consortium, Inc. ("ISC")
 //
 // Permission to use, copy, modify, and/or distribute this software for any
 // purpose with or without fee is hereby granted, provided that the above
@@ -43,6 +43,24 @@ TEST_F(Rdata_DHCID_Test, createFromString) {
     EXPECT_EQ(0, rdata_dhcid2.compare(rdata_dhcid));
 }
 
+TEST_F(Rdata_DHCID_Test, spaceSeparatedBase64) {
+    const in::DHCID rdata_dhcid2(
+            "0LIg0LvQtdGB0YMg 0YDQvtC00LjQu9Cw 0YHRjCDRkdC70L7R h9C60LA=");
+    EXPECT_EQ(0, rdata_dhcid2.compare(rdata_dhcid));
+}
+
+TEST_F(Rdata_DHCID_Test, multiLineBase64) {
+    const in::DHCID rdata_dhcid2(
+            "( 0LIg0LvQtdGB0YMg0YDQvtC00LjQu9Cw\n0YHRjCDRkdC70L7R h9C60LA= )");
+    EXPECT_EQ(0, rdata_dhcid2.compare(rdata_dhcid));
+}
+
+TEST_F(Rdata_DHCID_Test, extraText) {
+    EXPECT_THROW(const in::DHCID rdata_dhcid2(
+            "0LIg0LvQtdGB0YMg 0YDQvtC00LjQu9Cw 0YHRjCDRkdC70L7R h9C60LA="
+            " superextrabogustext"), isc::BadValue);
+}
+
 TEST_F(Rdata_DHCID_Test, badBase64) {
     EXPECT_THROW(const in::DHCID rdata_dhcid_bad("00"), isc::BadValue);
 }