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/*
* Copyright 2015 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef RTC_BASE_NETWORK_MONITOR_H_
#define RTC_BASE_NETWORK_MONITOR_H_
#include <functional>
#include <utility>
#include "absl/strings/string_view.h"
#include "rtc_base/network_constants.h"
namespace rtc {
class IPAddress;
enum class NetworkBindingResult {
SUCCESS = 0, // No error
FAILURE = -1, // Generic error
NOT_IMPLEMENTED = -2,
ADDRESS_NOT_FOUND = -3,
NETWORK_CHANGED = -4
};
// NetworkPreference property set by operating system/firmware that has
// information about connection strength to e.g WIFI router or CELL base towers.
// GENERATED_JAVA_ENUM_PACKAGE: org.webrtc
enum class NetworkPreference {
NEUTRAL = 0,
NOT_PREFERRED = -1,
};
const char* NetworkPreferenceToString(NetworkPreference preference);
// This interface is set onto a socket server,
// where only the ip address is known at the time of binding.
class NetworkBinderInterface {
public:
// Binds a socket to the network that is attached to `address` so that all
// packets on the socket `socket_fd` will be sent via that network.
// This is needed because some operating systems (like Android) require a
// special bind call to put packets on a non-default network interface.
virtual NetworkBindingResult BindSocketToNetwork(
int socket_fd,
const IPAddress& address) = 0;
virtual ~NetworkBinderInterface() {}
};
/*
* Receives network-change events via `OnNetworksChanged` and signals the
* networks changed event.
*
* Threading consideration:
* It is expected that all upstream operations (from native to Java) are
* performed from the worker thread. This includes creating, starting and
* stopping the monitor. This avoids the potential race condition when creating
* the singleton Java NetworkMonitor class. Downstream operations can be from
* any thread, but this class will forward all the downstream operations onto
* the worker thread.
*
* Memory consideration:
* NetworkMonitor is owned by the caller (NetworkManager). The global network
* monitor factory is owned by the PeerConnectionFactory.
*/
// Generic network monitor interface. It starts and stops monitoring network
// changes, and fires the SignalNetworksChanged event when networks change.
class NetworkMonitorInterface {
public:
struct InterfaceInfo {
// The type of adapter if known.
AdapterType adapter_type;
// Is ADAPTER_TYPE_UNKNOWN unless adapter_type == ADAPTER_TYPE_VPN.
AdapterType underlying_type_for_vpn = ADAPTER_TYPE_UNKNOWN;
// The OS/firmware specific preference of this interface.
NetworkPreference network_preference = NetworkPreference::NEUTRAL;
// Is this interface available to use? WebRTC shouldn't attempt to use it if
// this returns false.
//
// It's possible for this status to change, in which case
// SignalNetworksChanged will be fired.
//
// The specific use case this was added for was a phone with two SIM
// cards, where attempting to use all interfaces returned from getifaddrs
// caused the connection to be dropped.
bool available = true;
};
NetworkMonitorInterface();
virtual ~NetworkMonitorInterface();
virtual void Start() = 0;
virtual void Stop() = 0;
// Get information about an interface.
// If the interface is not known, the return struct will have set
// `adapter_type` to ADAPTER_TYPE_UNKNOWN and `available` to false.
virtual InterfaceInfo GetInterfaceInfo(absl::string_view interface_name) = 0;
// Does `this` NetworkMonitorInterface implement BindSocketToNetwork?
// Only Android returns true.
virtual bool SupportsBindSocketToNetwork() const { return false; }
// Bind a socket to an interface specified by ip address and/or interface
// name. Only implemented on Android.
virtual NetworkBindingResult BindSocketToNetwork(
int socket_fd,
const IPAddress& address,
absl::string_view interface_name) {
return NetworkBindingResult::NOT_IMPLEMENTED;
}
void SetNetworksChangedCallback(std::function<void()> callback) {
networks_changed_callback_ = std::move(callback);
}
protected:
void InvokeNetworksChangedCallback() {
if (networks_changed_callback_) {
networks_changed_callback_();
}
}
private:
std::function<void()> networks_changed_callback_;
};
} // namespace rtc
#endif // RTC_BASE_NETWORK_MONITOR_H_
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