implement HaveOnlyLoopbackAddresses() for android

BUG=132033
TEST=


Review URL: https://chromiumcodereview.appspot.com/10532080

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@142354 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 41 insertions, 0 deletions

diff --git a/net/android/java/org/chromium/net/AndroidNetworkLibrary.java b/net/android/java/org/chromium/net/AndroidNetworkLibrary.java
index 699a3a4..2de0854 100644
--- a/net/android/java/org/chromium/net/AndroidNetworkLibrary.java
+++ b/net/android/java/org/chromium/net/AndroidNetworkLibrary.java
@@ -13,6 +13,8 @@ import org.chromium.base.CalledByNative;
 import org.chromium.base.CalledByNativeUnchecked;
 
 import java.io.ByteArrayInputStream;
+import java.net.NetworkInterface;
+import java.net.SocketException;
 import java.net.URLConnection;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
@@ -21,6 +23,7 @@ import java.security.cert.CertificateException;
 import java.security.cert.CertificateFactory;
 import java.security.cert.X509Certificate;
 import java.util.concurrent.atomic.AtomicReference;
+import java.util.Enumeration;
 
 import javax.net.ssl.TrustManager;
 import javax.net.ssl.TrustManagerFactory;
@@ -58,6 +61,34 @@ class AndroidNetworkLibrary {
         return URLConnection.guessContentTypeFromName("foo." + extension);
     }
 
+    // Returns true if it can determine that only loopback addresses are configured.
+    // i.e. if only 127.0.0.1 and ::1 are routable.
+    // Also returns false if it cannot determine this.
+    @CalledByNative
+    static public boolean haveOnlyLoopbackAddresses() {
+        boolean result = true;
+        try {
+            Enumeration list = NetworkInterface.getNetworkInterfaces();
+            if (list == null) return false;
+
+            while (list.hasMoreElements()) {
+                NetworkInterface netIf = (NetworkInterface)list.nextElement();
+                try {
+                    if (!netIf.isUp() || netIf.isLoopback())
+                        continue;
+                    result = false;
+                    break;
+                } catch (SocketException e) {
+                    continue;
+                }
+            }
+        } catch (SocketException e) {
+            Log.w(TAG, "could not get network interfaces: " + e);
+            return false;
+        }
+        return result;
+    }
+
     /**
      * Validate the server's certificate chain is trusted.
      * @param certChain The ASN.1 DER encoded bytes for certificates.
diff --git a/net/android/network_library.cc b/net/android/network_library.cc
index 24a065e..57cf551 100644
--- a/net/android/network_library.cc
+++ b/net/android/network_library.cc
@@ -64,6 +64,11 @@ bool StoreKeyPair(const uint8* public_key,
   return ret;
 }
 
+bool HaveOnlyLoopbackAddresses() {
+  JNIEnv* env = AttachCurrentThread();
+  return Java_AndroidNetworkLibrary_haveOnlyLoopbackAddresses(env);
+}
+
 bool GetMimeTypeFromExtension(const std::string& extension,
                               std::string* result) {
   JNIEnv* env = AttachCurrentThread();
diff --git a/net/android/network_library.h b/net/android/network_library.h
index 5e2b8ec..a0a1913 100644
--- a/net/android/network_library.h
+++ b/net/android/network_library.h
@@ -40,6 +40,11 @@ bool StoreKeyPair(const uint8* public_key,
                   const uint8* private_key,
                   size_t private_len);
 
+// Returns true if it can determine that only loopback addresses are configured.
+// i.e. if only 127.0.0.1 and ::1 are routable.
+// Also returns false if it cannot determine this.
+bool HaveOnlyLoopbackAddresses();
+
 // Get the mime type (if any) that is associated with the file extension.
 // Returns true if a corresponding mime type exists.
 bool GetMimeTypeFromExtension(const std::string& extension,