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// Copyright 2019 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 "discovery/mdns/mdns_service_impl.h"
#include <memory>
#include <utility>
#include <vector>
#include "discovery/common/reporting_client.h"
#include "discovery/mdns/mdns_records.h"
#include "discovery/mdns/public/mdns_constants.h"
namespace openscreen {
namespace discovery {
// static
std::unique_ptr<MdnsService> MdnsService::Create(
TaskRunner* task_runner,
ReportingClient* reporting_client,
const Config& config,
const Config::NetworkInfo& network_info) {
return std::make_unique<MdnsServiceImpl>(
task_runner, Clock::now, reporting_client, config, network_info);
}
MdnsServiceImpl::MdnsServiceImpl(TaskRunner* task_runner,
ClockNowFunctionPtr now_function,
ReportingClient* reporting_client,
const Config& config,
const Config::NetworkInfo& network_info)
: task_runner_(task_runner),
now_function_(now_function),
reporting_client_(reporting_client),
receiver_(config),
interface_(network_info.interface.index) {
OSP_DCHECK(task_runner_);
OSP_DCHECK(reporting_client_);
OSP_DCHECK(network_info.supported_address_families);
// Create all UDP sockets needed for this object. They should not yet be bound
// so that they do not send or receive data until the objects on which their
// callback depends is initialized.
// NOTE: we bind to the Any addresses here because traffic is filtered by
// the multicast join calls.
if (network_info.supported_address_families & Config::NetworkInfo::kUseIpV4) {
ErrorOr<std::unique_ptr<UdpSocket>> socket = UdpSocket::Create(
task_runner, this,
IPEndpoint{IPAddress::kAnyV4(), kDefaultMulticastPort});
OSP_DCHECK(!socket.is_error());
OSP_DCHECK(socket.value().get());
OSP_DCHECK(socket.value()->IsIPv4());
socket_v4_ = std::move(socket.value());
}
if (network_info.supported_address_families & Config::NetworkInfo::kUseIpV6) {
ErrorOr<std::unique_ptr<UdpSocket>> socket = UdpSocket::Create(
task_runner, this,
IPEndpoint{IPAddress::kAnyV6(), kDefaultMulticastPort});
OSP_DCHECK(!socket.is_error());
OSP_DCHECK(socket.value().get());
OSP_DCHECK(socket.value()->IsIPv6());
socket_v6_ = std::move(socket.value());
}
// Initialize objects which depend on the above sockets.
UdpSocket* socket_ptr =
socket_v4_.get() ? socket_v4_.get() : socket_v6_.get();
OSP_DCHECK(socket_ptr);
sender_ = std::make_unique<MdnsSender>(socket_ptr);
if (config.enable_querying) {
querier_ = std::make_unique<MdnsQuerier>(
sender_.get(), &receiver_, task_runner_, now_function_, &random_delay_,
reporting_client_, config);
}
if (config.enable_publication) {
probe_manager_ = std::make_unique<MdnsProbeManagerImpl>(
sender_.get(), &receiver_, &random_delay_, task_runner_, now_function_);
publisher_ =
std::make_unique<MdnsPublisher>(sender_.get(), probe_manager_.get(),
task_runner_, now_function_, config);
responder_ = std::make_unique<MdnsResponder>(
publisher_.get(), probe_manager_.get(), sender_.get(), &receiver_,
task_runner_, now_function_, &random_delay_, config);
}
receiver_.Start();
// Initialize all sockets to start sending/receiving data. Now that the above
// objects have all been created, it they should be able to safely do so.
// NOTE: Although only one of these sockets is used for sending, both will be
// used for reading on the mDNS v4 and v6 addresses and ports.
if (socket_v4_) {
socket_v4_->Bind();
}
if (socket_v6_) {
socket_v6_->Bind();
}
}
MdnsServiceImpl::~MdnsServiceImpl() = default;
void MdnsServiceImpl::StartQuery(const DomainName& name,
DnsType dns_type,
DnsClass dns_class,
MdnsRecordChangedCallback* callback) {
return querier_->StartQuery(name, dns_type, dns_class, callback);
}
void MdnsServiceImpl::StopQuery(const DomainName& name,
DnsType dns_type,
DnsClass dns_class,
MdnsRecordChangedCallback* callback) {
return querier_->StopQuery(name, dns_type, dns_class, callback);
}
void MdnsServiceImpl::ReinitializeQueries(const DomainName& name) {
querier_->ReinitializeQueries(name);
}
Error MdnsServiceImpl::StartProbe(MdnsDomainConfirmedProvider* callback,
DomainName requested_name,
IPAddress address) {
return probe_manager_->StartProbe(callback, std::move(requested_name),
std::move(address));
}
Error MdnsServiceImpl::RegisterRecord(const MdnsRecord& record) {
return publisher_->RegisterRecord(record);
}
Error MdnsServiceImpl::UpdateRegisteredRecord(const MdnsRecord& old_record,
const MdnsRecord& new_record) {
return publisher_->UpdateRegisteredRecord(old_record, new_record);
}
Error MdnsServiceImpl::UnregisterRecord(const MdnsRecord& record) {
return publisher_->UnregisterRecord(record);
}
void MdnsServiceImpl::OnError(UdpSocket* socket, Error error) {
reporting_client_->OnFatalError(error);
}
void MdnsServiceImpl::OnSendError(UdpSocket* socket, Error error) {
sender_->OnSendError(socket, error);
}
void MdnsServiceImpl::OnRead(UdpSocket* socket, ErrorOr<UdpPacket> packet) {
receiver_.OnRead(socket, std::move(packet));
}
void MdnsServiceImpl::OnBound(UdpSocket* socket) {
// Socket configuration must occur after the socket has been bound
// successfully.
if (socket == socket_v4_.get()) {
socket_v4_->SetMulticastOutboundInterface(interface_);
socket_v4_->JoinMulticastGroup(kDefaultMulticastGroupIPv4, interface_);
socket_v4_->JoinMulticastGroup(kDefaultSiteLocalGroupIPv4, interface_);
} else if (socket == socket_v6_.get()) {
socket_v6_->SetMulticastOutboundInterface(interface_);
socket_v6_->JoinMulticastGroup(kDefaultMulticastGroupIPv6, interface_);
socket_v6_->JoinMulticastGroup(kDefaultSiteLocalGroupIPv6, interface_);
} else {
// Sanity check: we shouldn't be called for sockets we haven't subscribed
// to.
OSP_NOTREACHED();
}
}
} // namespace discovery
} // namespace openscreen
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