[Chromecast] Reland "Ignore interfaces not used to connect to internet."

Add NetworkChangeNotifierFactoryCast to create instance of
NetworkChangeNotifierLinux that ignores interfaces that will not be
used to connect to internet.

BUG=469863
R=gunsch@chromium.org

Review URL: https://codereview.chromium.org/1138923002

Cr-Commit-Position: refs/heads/master@{#329445}

4 files changed, 104 insertions, 0 deletions

diff --git a/chromecast/net/net_util_cast.cc b/chromecast/net/net_util_cast.cc
new file mode 100644
index 0000000..6e68831
--- /dev/null
+++ b/chromecast/net/net_util_cast.cc
@@ -0,0 +1,33 @@
+// Copyright 2015 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 "chromecast/net/net_util_cast.h"
+
+#include "base/command_line.h"
+#include "base/strings/string_split.h"
+#include "chromecast/base/cast_sys_info_util.h"
+#include "chromecast/net/net_switches.h"
+#include "chromecast/public/cast_sys_info.h"
+
+namespace chromecast {
+
+base::hash_set<std::string> GetIgnoredInterfaces() {
+  base::hash_set<std::string> ignored_interfaces;
+  scoped_ptr<CastSysInfo> sys_info = CreateSysInfo();
+  if (!sys_info->GetApInterface().empty())
+    ignored_interfaces.insert(sys_info->GetApInterface());
+
+  // Add interfaces from "netif-to-ignore" switch.
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  base::CommandLine::StringType netifs_to_ignore_str =
+      command_line->GetSwitchValueNative(switches::kNetifsToIgnore);
+  base::CommandLine::StringVector netifs_to_ignore_vector;
+  base::SplitString(netifs_to_ignore_str, ',', &netifs_to_ignore_vector);
+  for (const auto& netif : netifs_to_ignore_vector)
+    ignored_interfaces.insert(netif);
+
+  return ignored_interfaces;
+}
+
+}  // namespace chromecast
diff --git a/chromecast/net/net_util_cast.h b/chromecast/net/net_util_cast.h
new file mode 100644
index 0000000..2ec95bb
--- /dev/null
+++ b/chromecast/net/net_util_cast.h
@@ -0,0 +1,20 @@
+// Copyright 2015 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.
+
+#ifndef CHROMECAST_NET_NET_UTIL_H_
+#define CHROMECAST_NET_NET_UTIL_H_
+
+#include <string>
+
+#include "base/containers/hash_tables.h"
+
+namespace chromecast {
+
+// Gets the list of interfaces that should be ignored. The interfaces returned
+// by this function will not be used to connect to the internet.
+base::hash_set<std::string> GetIgnoredInterfaces();
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_NET_NET_UTIL_CAST_H_
diff --git a/chromecast/net/network_change_notifier_factory_cast.cc b/chromecast/net/network_change_notifier_factory_cast.cc
new file mode 100644
index 0000000..4c1cd60
--- /dev/null
+++ b/chromecast/net/network_change_notifier_factory_cast.cc
@@ -0,0 +1,20 @@
+// Copyright 2015 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 "chromecast/net/network_change_notifier_factory_cast.h"
+
+#include "chromecast/net/net_util_cast.h"
+#include "net/base/network_change_notifier_linux.h"
+
+namespace chromecast {
+
+net::NetworkChangeNotifier* NetworkChangeNotifierFactoryCast::CreateInstance() {
+  // Caller assumes ownership.
+  return new net::NetworkChangeNotifierLinux(GetIgnoredInterfaces());
+}
+
+NetworkChangeNotifierFactoryCast::~NetworkChangeNotifierFactoryCast() {
+}
+
+}  // namespace chromecast
diff --git a/chromecast/net/network_change_notifier_factory_cast.h b/chromecast/net/network_change_notifier_factory_cast.h
new file mode 100644
index 0000000..058d5b9
--- /dev/null
+++ b/chromecast/net/network_change_notifier_factory_cast.h
@@ -0,0 +1,31 @@
+// Copyright 2015 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.
+
+#ifndef CHROMECAST_NET_NETWORK_CHANGE_NOTIFIER_FACTORY_CAST_H_
+#define CHROMECAST_NET_NETWORK_CHANGE_NOTIFIER_FACTORY_CAST_H_
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "net/base/network_change_notifier_factory.h"
+
+namespace chromecast {
+
+class NetworkChangeNotifierCast;
+
+class NetworkChangeNotifierFactoryCast
+    : public net::NetworkChangeNotifierFactory {
+ public:
+  NetworkChangeNotifierFactoryCast() {}
+  ~NetworkChangeNotifierFactoryCast() override;
+
+  // net::NetworkChangeNotifierFactory implementation:
+  net::NetworkChangeNotifier* CreateInstance() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierFactoryCast);
+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_NET_NETWORK_CHANGE_NOTIFIER_FACTORY_CAST_H_