6707289: InterfaceAddress.getNetworkPrefixLength() does not conform to Javadoc

Reviewed-by: michaelm

jdk/src/windows/native/java/net/NetworkInterface_winXP.c

@@ -172,7 +172,7 @@ int getAllInterfacesAndAddresses (JNIEnv *env, netif **netifPP)
     DWORD ret;
     IP_ADAPTER_ADDRESSES *ptr, *adapters=0;
     ULONG len=ipinflen, count=0;
-    netif *nif=0, *dup_nif, *last=0, *loopif=0;
+    netif *nif=0, *dup_nif, *last=0, *loopif=0, *curr;
     int tun=0, net=0;
 
     *netifPP = 0;
@@ -197,6 +197,20 @@ int getAllInterfacesAndAddresses (JNIEnv *env, netif **netifPP)
         last = nif;
     }
 
+    // Retrieve IPv4 addresses with the IP Helper API
+    curr = *netifPP;
+    while (curr != NULL) {
+        netaddr *netaddrP;
+        ret = enumAddresses_win(env, curr, &netaddrP);
+        if ((*env)->ExceptionOccurred(env)) {
+            free_netaddr(netaddrP);
+            return -1;
+        }
+        curr->addrs = netaddrP;
+        curr->naddrs += ret;
+        curr = curr->next;
+    }
+
     ret = getAdapters (env, &adapters);
     if (ret != ERROR_SUCCESS) {
         goto err;
@@ -350,6 +364,14 @@ static int getAddrsFromAdapter(IP_ADAPTER_ADDRESSES *ptr, netaddr **netaddrPP) {
         /* address is only usable if dad state is preferred or deprecated */
         if (uni_addr->DadState == IpDadStateDeprecated ||
                 uni_addr->DadState == IpDadStatePreferred) {
+            sock = uni_addr->Address.lpSockaddr;
+
+            // IPv4 addresses already retrieved with enumAddresses_win
+            if (sock->sa_family == AF_INET) {
+                uni_addr = uni_addr->Next;
+                continue;
+            }
+
             curr = (netaddr *)calloc (1, sizeof (netaddr));
             if (curr == 0) {
                 return -1;
@@ -361,15 +383,9 @@ static int getAddrsFromAdapter(IP_ADAPTER_ADDRESSES *ptr, netaddr **netaddrPP) {
                 prev->next = curr;
             }
             prev = curr;
-            sock = uni_addr->Address.lpSockaddr;
             SOCKETADDRESS_COPY (&curr->addr, sock);
             if (prefix != NULL) {
               curr->mask = (short)prefix->PrefixLength;
-              if (sock->sa_family == AF_INET) {
-                sock = prefix->Address.lpSockaddr;
-                SOCKETADDRESS_COPY(&curr->brdcast, sock);
-                curr->brdcast.him4.sin_addr.s_addr |= htonl((0xffffffff >> curr->mask));
-              }
               prefix = prefix->Next;
             }
             count ++;

jdk/test/java/net/InterfaceAddress/NetworkPrefixLength.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2010 Sun Microsystems, Inc.  All Rights Reserved.
+ * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/* @test
+ * @bug 6707289
+ * @summary InterfaceAddress.getNetworkPrefixLength() does not conform to Javadoc
+ */
+
+import java.net.InetAddress;
+import java.net.Inet4Address;
+import java.net.InterfaceAddress;
+import java.net.NetworkInterface;
+import java.util.Enumeration;
+import static java.lang.System.out;
+
+public class NetworkPrefixLength {
+    static boolean passed = true;
+
+    public static void main(String[] args) throws Exception {
+        Enumeration<NetworkInterface> nics = NetworkInterface.getNetworkInterfaces();
+
+        while (nics.hasMoreElements()) {
+            NetworkInterface nic = nics.nextElement();
+            for (InterfaceAddress iaddr : nic.getInterfaceAddresses()) {
+                boolean valid = checkPrefix(iaddr);
+                if (!valid) {
+                    passed = false;
+                    debug(nic.getName(), iaddr);
+                }
+            }
+        }
+
+        if (!passed)
+            throw new RuntimeException("Failed: some interfaces have invalid prefix lengths");
+    }
+
+    static boolean checkPrefix(InterfaceAddress iaddr) {
+        InetAddress addr = iaddr.getAddress();
+
+        if (addr instanceof Inet4Address)
+            return checkIPv4PrefixLength(iaddr.getNetworkPrefixLength());
+        else
+            return checkIPv6PrefixLength(iaddr.getNetworkPrefixLength());
+    }
+
+    static boolean checkIPv4PrefixLength(int prefix) {
+        if (prefix >=0 && prefix <= 32)
+            return true;
+
+        return false;
+    }
+
+    static boolean checkIPv6PrefixLength(int prefix) {
+        if (prefix >=0 && prefix <= 128)
+            return true;
+
+        return false;
+    }
+
+    static void debug(String nicName, InterfaceAddress iaddr) {
+        out.println("NIC " + nicName + " has an address with an invalid prefix length:\n" + iaddr);
+    }
+}
+