8074761: Empty optional parameters of LDAP query are not interpreted as empty

Reviewed-by: vinnie
Contributed-by: NStanislav Baiduzhyi <sbaiduzh@redhat.com>

src/share/classes/com/sun/jndi/ldap/LdapURL.java

@@ -26,9 +26,6 @@
 package com.sun.jndi.ldap;
 
 import javax.naming.*;
-import javax.naming.directory.*;
-import javax.naming.spi.*;
-import java.net.URL;
 import java.net.MalformedURLException;
 import java.io.UnsupportedEncodingException;
 import java.util.StringTokenizer;
@@ -211,44 +208,53 @@ final public class LdapURL extends Uri {
 
         // query begins with a '?' or is null
 
-        if (query == null) {
+        if (query == null || query.length() < 2) {
             return;
         }
 
-        int qmark2 = query.indexOf('?', 1);
+        int currentIndex = 1;
+        int nextQmark;
+        int endIndex;
 
-        if (qmark2 < 0) {
-            attributes = query.substring(1);
+        // attributes:
+        nextQmark = query.indexOf('?', currentIndex);
+        endIndex = nextQmark == -1 ? query.length() : nextQmark;
+        if (endIndex - currentIndex > 0) {
+            attributes = query.substring(currentIndex, endIndex);
+        }
+        currentIndex = endIndex + 1;
+        if (currentIndex >= query.length()) {
             return;
-        } else if (qmark2 != 1) {
-            attributes = query.substring(1, qmark2);
         }
 
-        int qmark3 = query.indexOf('?', qmark2 + 1);
-
-        if (qmark3 < 0) {
-            scope = query.substring(qmark2 + 1);
+        // scope:
+        nextQmark = query.indexOf('?', currentIndex);
+        endIndex = nextQmark == -1 ? query.length() : nextQmark;
+        if (endIndex - currentIndex > 0) {
+            scope = query.substring(currentIndex, endIndex);
+        }
+        currentIndex = endIndex + 1;
+        if (currentIndex >= query.length()) {
             return;
-        } else if (qmark3 != qmark2 + 1) {
-            scope = query.substring(qmark2 + 1, qmark3);
         }
 
-        int qmark4 = query.indexOf('?', qmark3 + 1);
-
-        if (qmark4 < 0) {
-            filter = query.substring(qmark3 + 1);
-        } else {
-            if (qmark4 != qmark3 + 1) {
-                filter = query.substring(qmark3 + 1, qmark4);
-            }
-            extensions = query.substring(qmark4 + 1);
-            if (extensions.length() > 0) {
-                extensions = UrlUtil.decode(extensions, "UTF8");
-            }
-        }
-        if (filter != null && filter.length() > 0) {
+        // filter:
+        nextQmark = query.indexOf('?', currentIndex);
+        endIndex = nextQmark == -1 ? query.length() : nextQmark;
+        if (endIndex - currentIndex > 0) {
+            filter = query.substring(currentIndex, endIndex);
             filter = UrlUtil.decode(filter, "UTF8");
         }
+        currentIndex = endIndex + 1;
+        if (currentIndex >= query.length()) {
+            return;
+        }
+
+        // extensions:
+        if (query.length() - currentIndex > 0) {
+            extensions = query.substring(currentIndex);
+            extensions = UrlUtil.decode(extensions, "UTF8");
+        }
     }
 
 /*

test/com/sun/jndi/ldap/LdapURLOptionalFields.java

+/*
+ * Copyright (c) 2015, Red Hat, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test
+ * @bug 8074761
+ * @summary RFC-2255 allows attribute, scope and filter to be empty.
+ */
+
+import com.sun.jndi.ldap.LdapURL;
+
+public class LdapURLOptionalFields {
+
+    private static final String[] TEST_URLS = {
+        "ldap://localhost:10389/ou=RefPeople,dc=example,dc=com",
+        "ldap://localhost:10389/ou=RefPeople,dc=example,dc=com?",
+        "ldap://localhost:10389/ou=RefPeople,dc=example,dc=com??",
+        "ldap://localhost:10389/ou=RefPeople,dc=example,dc=com???",
+        "ldap://localhost:10389/ou=RefPeople,dc=example,dc=com????"
+    };
+
+    public static void main(String[] args) throws Exception {
+        for (int i = 0; i < TEST_URLS.length; i++) {
+            String url = TEST_URLS[i];
+            checkEmptyAttributes(url);
+        }
+    }
+
+    private static void checkEmptyAttributes(String urlString) throws Exception {
+        LdapURL url = new LdapURL(urlString);
+        if (url.getAttributes() != null) {
+            throw new Exception("Expected null attributes for url: '" + urlString + "'");
+        }
+        if (url.getScope() != null) {
+            throw new Exception("Expected null scope for url: '" + urlString + "'");
+        }
+        if (url.getFilter() != null) {
+            throw new Exception("Expected null filter for url: '" + urlString + "'");
+        }
+    }
+
+}