8056264: Multicast support improvements

Summary: avoid passing a null ifname string to GetStringUTFChars native fn calls within a NetworkInterface method call flows
Reviewed-by: chegar, alanb

src/share/classes/java/net/MulticastSocket.java

 /*
- * Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1995, 2014, Oracle and/or its affiliates. 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
@@ -569,7 +569,7 @@ class MulticastSocket extends DatagramSocket {
     public NetworkInterface getNetworkInterface() throws SocketException {
         NetworkInterface ni
             = (NetworkInterface)getImpl().getOption(SocketOptions.IP_MULTICAST_IF2);
-        if (ni.getIndex() == 0) {
+        if ((ni.getIndex() == 0) || (ni.getIndex() == -1)) {
             InetAddress[] addrs = new InetAddress[1];
             addrs[0] = InetAddress.anyLocalAddress();
             return new NetworkInterface(addrs[0].getHostName(), 0, addrs);

src/solaris/native/java/net/NetworkInterface.c

 /*
- * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2014, Oracle and/or its affiliates. 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
@@ -570,9 +570,14 @@ JNIEXPORT jint JNICALL Java_java_net_NetworkInterface_getMTU0(JNIEnv *env, jclas
     jboolean isCopy;
     int ret = -1;
     int sock;
-    const char* name_utf;
+    const char* name_utf = NULL;
 
-    name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
+    if (name != NULL) {
+        name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
+    } else {
+        JNU_ThrowNullPointerException(env, "network interface name is NULL");
+        return ret;
+    }
     if (name_utf == NULL) {
        if (!(*env)->ExceptionCheck(env))
            JNU_ThrowOutOfMemoryError(env, NULL);
@@ -600,7 +605,12 @@ static int getFlags0(JNIEnv *env, jstring name) {
     const char* name_utf;
     int flags = 0;
 
-    name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
+    if (name != NULL) {
+        name_utf = (*env)->GetStringUTFChars(env, name, &isCopy);
+    } else {
+        JNU_ThrowNullPointerException(env, "network interface name is NULL");
+        return -1;
+    }
     if (name_utf == NULL) {
        if (!(*env)->ExceptionCheck(env))
            JNU_ThrowOutOfMemoryError(env, NULL);
@@ -1474,7 +1484,12 @@ static int getMTU(JNIEnv *env, int sock,  const char *ifname) {
     struct ifreq if2;
 
     memset((char *) &if2, 0, sizeof(if2));
-    strcpy(if2.ifr_name, ifname);
+    if (ifname != NULL) {
+        strcpy(if2.ifr_name, ifname);
+    } else {
+        JNU_ThrowNullPointerException(env, "network interface name is NULL");
+        return -1;
+    }
 
     if (ioctl(sock, SIOCGIFMTU, (char *)&if2) < 0) {
         NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", "IOCTL SIOCGIFMTU failed");

src/solaris/native/java/net/PlainDatagramSocketImpl.c

 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2014, Oracle and/or its affiliates. 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
@@ -1474,10 +1474,12 @@ jobject getMulticastInterface(JNIEnv *env, jobject this, int fd, jint opt) {
         static jmethodID ni_ctrID;
         static jfieldID ni_indexID;
         static jfieldID ni_addrsID;
+        static jfieldID ni_nameID;
 
         jobjectArray addrArray;
         jobject addr;
         jobject ni;
+        jobject ni_name;
 
         struct in_addr in;
         struct in_addr *inP = ∈
@@ -1527,6 +1529,8 @@ jobject getMulticastInterface(JNIEnv *env, jobject this, int fd, jint opt) {
             ni_addrsID = (*env)->GetFieldID(env, c, "addrs",
                                             "[Ljava/net/InetAddress;");
             CHECK_NULL_RETURN(ni_addrsID, NULL);
+            ni_nameID = (*env)->GetFieldID(env, c,"name", "Ljava/lang/String;");
+            CHECK_NULL_RETURN(ni_nameID, NULL);
             ni_class = (*env)->NewGlobalRef(env, c);
             CHECK_NULL_RETURN(ni_class, NULL);
         }
@@ -1548,6 +1552,10 @@ jobject getMulticastInterface(JNIEnv *env, jobject this, int fd, jint opt) {
         CHECK_NULL_RETURN(addrArray, NULL);
         (*env)->SetObjectArrayElement(env, addrArray, 0, addr);
         (*env)->SetObjectField(env, ni, ni_addrsID, addrArray);
+        ni_name = (*env)->NewStringUTF(env, "");
+        if (ni_name != NULL) {
+            (*env)->SetObjectField(env, ni, ni_nameID, ni_name);
+        }
         return ni;
     }
 
@@ -1564,14 +1572,16 @@ jobject getMulticastInterface(JNIEnv *env, jobject this, int fd, jint opt) {
         static jfieldID ni_indexID;
         static jfieldID ni_addrsID;
         static jclass ia_class;
+        static jfieldID ni_nameID;
         static jmethodID ia_anyLocalAddressID;
 
-        int index;
+        int index = 0;
         int len = sizeof(index);
 
         jobjectArray addrArray;
         jobject addr;
         jobject ni;
+        jobject ni_name;
 
         if (JVM_GetSockOpt(fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
                            (char*)&index, &len) < 0) {
@@ -1600,6 +1610,8 @@ jobject getMulticastInterface(JNIEnv *env, jobject this, int fd, jint opt) {
                                                              "anyLocalAddress",
                                                              "()Ljava/net/InetAddress;");
             CHECK_NULL_RETURN(ia_anyLocalAddressID, NULL);
+            ni_nameID = (*env)->GetFieldID(env, c,"name", "Ljava/lang/String;");
+            CHECK_NULL_RETURN(ni_nameID, NULL);
             ni_class = (*env)->NewGlobalRef(env, c);
             CHECK_NULL_RETURN(ni_class, NULL);
         }
@@ -1660,6 +1672,10 @@ jobject getMulticastInterface(JNIEnv *env, jobject this, int fd, jint opt) {
         CHECK_NULL_RETURN(addrArray, NULL);
         (*env)->SetObjectArrayElement(env, addrArray, 0, addr);
         (*env)->SetObjectField(env, ni, ni_addrsID, addrArray);
+        ni_name = (*env)->NewStringUTF(env, "");
+        if (ni_name != NULL) {
+            (*env)->SetObjectField(env, ni, ni_nameID, ni_name);
+        }
         return ni;
     }
 #endif