Infer network connection type from network interface type.

net/base/network_change_notifier.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/network_change_notifier.h"
 
 #include "base/metrics/histogram.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #include "build/build_config.h"
@@ skipping 745 matching lines @@
 }
 
 // static
 void NetworkChangeNotifier::SetDnsConfig(const DnsConfig& config) {
   if (!g_network_change_notifier)
     return;
   g_network_change_notifier->network_state_->SetDnsConfig(config);
   NotifyObserversOfDNSChange();
 }
 
+// static
+NetworkChangeNotifier::ConnectionType
+NetworkChangeNotifier::ConnectionTypeFromInterfaces() {
+  NetworkInterfaceList interfaces;
+  if (!GetNetworkList(&interfaces, EXCLUDE_HOST_SCOPE_VIRTUAL_INTERFACES))
+    return CONNECTION_UNKNOWN;
+  return ConnectionTypeFromInterfaceList(interfaces);
+}
+
+//static
+NetworkChangeNotifier::ConnectionType
+NetworkChangeNotifier::ConnectionTypeFromInterfaceList(
+    const NetworkInterfaceList& interfaces) {
+  bool first = true;
+  ConnectionType result = CONNECTION_UNKNOWN;
+  for (size_t i = 0; i < interfaces.size(); ++i) {
+#if defined(OS_WIN)
+    if (interfaces[i].friendly_name == "Teredo Tunneling Pseudo-Interface")
+      continue;
+#endif
+    if (first) {
+      first = false;
+      result = interfaces[i].type;
+    } else if (result != interfaces[i].type) {
+      return CONNECTION_UNKNOWN;
+    }
+  }
+  return result;
+}
+
 void NetworkChangeNotifier::NotifyObserversOfConnectionTypeChange() {
   if (g_network_change_notifier) {
     g_network_change_notifier->connection_type_observer_list_->Notify(
         &ConnectionTypeObserver::OnConnectionTypeChanged,
         GetConnectionType());
   }
 }
 
 void NetworkChangeNotifier::NotifyObserversOfNetworkChange(
     ConnectionType type) {
   if (g_network_change_notifier) {
     g_network_change_notifier->network_change_observer_list_->Notify(
         &NetworkChangeObserver::OnNetworkChanged,
         type);
   }
 }
 
 NetworkChangeNotifier::DisableForTest::DisableForTest()
     : network_change_notifier_(g_network_change_notifier) {
   DCHECK(g_network_change_notifier);
   g_network_change_notifier = NULL;
 }
 
 NetworkChangeNotifier::DisableForTest::~DisableForTest() {
   DCHECK(!g_network_change_notifier);
   g_network_change_notifier = network_change_notifier_;
 }
 
 }  // namespace net