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// 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 "third_party/blink/renderer/platform/p2p/filtering_network_manager.h"
#include <utility>
#include "base/location.h"
#include "base/logging.h"
#include "base/threading/thread_task_runner_handle.h"
#include "media/base/media_permission.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
namespace blink {
FilteringNetworkManager::FilteringNetworkManager(
rtc::NetworkManager* network_manager,
media::MediaPermission* media_permission,
bool allow_mdns_obfuscation)
: network_manager_(network_manager),
media_permission_(media_permission),
allow_mdns_obfuscation_(allow_mdns_obfuscation) {
DETACH_FROM_THREAD(thread_checker_);
set_enumeration_permission(ENUMERATION_BLOCKED);
// If the feature is not enabled, just return ALLOWED as it's requested.
if (!media_permission_) {
started_permission_check_ = true;
set_enumeration_permission(ENUMERATION_ALLOWED);
VLOG(3) << "media_permission is not passed, granting permission";
return;
}
}
FilteringNetworkManager::~FilteringNetworkManager() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
// This helps to catch the case if permission never comes back.
if (!start_updating_time_.is_null())
ReportMetrics(false);
}
base::WeakPtr<FilteringNetworkManager> FilteringNetworkManager::GetWeakPtr() {
return weak_ptr_factory_.GetWeakPtr();
}
void FilteringNetworkManager::Initialize() {
rtc::NetworkManagerBase::Initialize();
if (media_permission_)
CheckPermission();
}
void FilteringNetworkManager::StartUpdating() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(started_permission_check_);
if (start_updating_time_.is_null()) {
start_updating_time_ = base::TimeTicks::Now();
network_manager_->SignalNetworksChanged.connect(
this, &FilteringNetworkManager::OnNetworksChanged);
}
// Update |pending_network_update_| and |start_count_| before calling
// StartUpdating, in case the update signal is fired synchronously.
pending_network_update_ = true;
++start_count_;
network_manager_->StartUpdating();
// If we have not sent the first update, which implies we have not received
// the first network update from the base network manager, we wait until the
// base network manager signals a network change for us to populate the
// network information in |OnNetworksChanged| and fire the event there.
if (sent_first_update_) {
FireEventIfStarted();
}
}
void FilteringNetworkManager::StopUpdating() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
network_manager_->StopUpdating();
DCHECK_GT(start_count_, 0);
--start_count_;
}
void FilteringNetworkManager::GetNetworks(NetworkList* networks) const {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
networks->clear();
if (enumeration_permission() == ENUMERATION_ALLOWED)
NetworkManagerBase::GetNetworks(networks);
VLOG(3) << "GetNetworks() returns " << networks->size() << " networks.";
}
webrtc::MdnsResponderInterface* FilteringNetworkManager::GetMdnsResponder()
const {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
// mDNS responder is set to null if we have the enumeration permission or the
// mDNS obfuscation of IPs is disallowed.
if (enumeration_permission() == ENUMERATION_ALLOWED ||
!allow_mdns_obfuscation_)
return nullptr;
return network_manager_->GetMdnsResponder();
}
void FilteringNetworkManager::CheckPermission() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(!started_permission_check_);
started_permission_check_ = true;
pending_permission_checks_ = 2;
VLOG(1) << "FilteringNetworkManager checking permission status.";
// Request for media permission asynchronously.
media_permission_->HasPermission(
media::MediaPermission::AUDIO_CAPTURE,
WTF::Bind(&FilteringNetworkManager::OnPermissionStatus, GetWeakPtr()));
media_permission_->HasPermission(
media::MediaPermission::VIDEO_CAPTURE,
WTF::Bind(&FilteringNetworkManager::OnPermissionStatus, GetWeakPtr()));
}
void FilteringNetworkManager::OnPermissionStatus(bool granted) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK_GT(pending_permission_checks_, 0);
VLOG(1) << "FilteringNetworkManager received permission status: "
<< (granted ? "granted" : "denied");
blink::IPPermissionStatus old_status = GetIPPermissionStatus();
--pending_permission_checks_;
if (granted)
set_enumeration_permission(ENUMERATION_ALLOWED);
// If the IP permission status changed *and* we have an up-to-date network
// list, fire a network change event.
if (GetIPPermissionStatus() != old_status && !pending_network_update_)
FireEventIfStarted();
}
void FilteringNetworkManager::OnNetworksChanged() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
pending_network_update_ = false;
// Update the default local addresses.
rtc::IPAddress ipv4_default;
rtc::IPAddress ipv6_default;
network_manager_->GetDefaultLocalAddress(AF_INET, &ipv4_default);
network_manager_->GetDefaultLocalAddress(AF_INET6, &ipv6_default);
set_default_local_addresses(ipv4_default, ipv6_default);
// Copy and merge the networks. Fire a signal if the permission status is
// known.
NetworkList networks;
network_manager_->GetNetworks(&networks);
NetworkList copied_networks;
copied_networks.reserve(networks.size());
for (rtc::Network* network : networks) {
auto copied_network = std::make_unique<rtc::Network>(*network);
copied_network->set_default_local_address_provider(this);
copied_network->set_mdns_responder_provider(this);
copied_networks.push_back(copied_network.release());
}
bool changed;
MergeNetworkList(copied_networks, &changed);
// We wait until our permission status is known before firing a network
// change signal, so that the listener(s) don't miss out on receiving a
// full network list.
if (changed && GetIPPermissionStatus() != blink::PERMISSION_UNKNOWN)
FireEventIfStarted();
}
void FilteringNetworkManager::ReportMetrics(bool report_start_latency) {
if (report_start_latency) {
blink::ReportTimeToUpdateNetworkList(base::TimeTicks::Now() -
start_updating_time_);
}
ReportIPPermissionStatus(GetIPPermissionStatus());
}
blink::IPPermissionStatus FilteringNetworkManager::GetIPPermissionStatus()
const {
if (enumeration_permission() == ENUMERATION_ALLOWED) {
return media_permission_ ? blink::PERMISSION_GRANTED_WITH_CHECKING
: blink::PERMISSION_GRANTED_WITHOUT_CHECKING;
}
if (!pending_permission_checks_ &&
enumeration_permission() == ENUMERATION_BLOCKED) {
return blink::PERMISSION_DENIED;
}
return blink::PERMISSION_UNKNOWN;
}
void FilteringNetworkManager::FireEventIfStarted() {
if (!start_count_)
return;
if (!sent_first_update_)
ReportMetrics(true);
// Post a task to avoid reentrancy.
//
// TODO(crbug.com/787254): Use Frame-based TaskRunner here.
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, WTF::Bind(&FilteringNetworkManager::SendNetworksChangedSignal,
GetWeakPtr()));
sent_first_update_ = true;
}
void FilteringNetworkManager::SendNetworksChangedSignal() {
SignalNetworksChanged();
}
} // namespace blink
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