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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "components/openscreen_platform/udp_socket.h"
#include <utility>
#include "base/containers/span.h"
#include "base/functional/bind.h"
#include "components/openscreen_platform/network_context.h"
#include "components/openscreen_platform/network_util.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "net/base/address_family.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_errors.h"
#include "services/network/public/mojom/network_context.mojom.h"
#include "third_party/openscreen/src/platform/base/udp_packet.h"
// Open Screen expects us to provide linked implementations of some of its
// static create methods, which have to be in their namespace.
namespace openscreen {
// static
ErrorOr<std::unique_ptr<UdpSocket>> UdpSocket::Create(
TaskRunner& task_runner,
Client* client,
const IPEndpoint& local_endpoint) {
network::mojom::NetworkContext* const network_context =
openscreen_platform::GetNetworkContext();
if (!network_context) {
return Error::Code::kInitializationFailure;
}
mojo::PendingRemote<network::mojom::UDPSocketListener> listener_remote;
mojo::PendingReceiver<network::mojom::UDPSocketListener> pending_listener =
listener_remote.InitWithNewPipeAndPassReceiver();
mojo::Remote<network::mojom::UDPSocket> socket;
network_context->CreateUDPSocket(socket.BindNewPipeAndPassReceiver(),
std::move(listener_remote));
return ErrorOr<std::unique_ptr<UdpSocket>>(
std::make_unique<openscreen_platform::UdpSocket>(
client, local_endpoint, std::move(socket),
std::move(pending_listener)));
}
} // namespace openscreen
namespace openscreen_platform {
namespace {
using openscreen::ByteView;
using openscreen::Error;
using openscreen::IPAddress;
using openscreen::IPEndpoint;
using openscreen::UdpPacket;
constexpr net::NetworkTrafficAnnotationTag kTrafficAnnotation =
net::DefineNetworkTrafficAnnotation("openscreen_message", R"(
semantics {
sender: "Open Screen"
description:
"Open Screen messages are used by the third_party Open Screen "
"library, in accordance to the specification defined by the Open "
"Screen protocol. The protocol is available publicly at: "
"https://github.com/webscreens/openscreenprotocol"
trigger:
"Any message that needs to be sent or received by the Open Screen "
"library."
data:
"Messages defined by the Open Screen Protocol specification."
destination: OTHER
destination_other:
"The connection is made to an Open Screen endpoint on the LAN "
"selected by the user, i.e. via a dialog."
}
policy {
cookies_allowed: NO
setting:
"This request cannot be disabled, but it would not be sent if user "
"does not connect to a Open Screen endpoint on the local network."
policy_exception_justification: "Not implemented."
})");
} // namespace
UdpSocket::UdpSocket(
Client* client,
const IPEndpoint& local_endpoint,
mojo::Remote<network::mojom::UDPSocket> udp_socket,
mojo::PendingReceiver<network::mojom::UDPSocketListener> pending_listener)
: client_(client),
local_endpoint_(local_endpoint),
udp_socket_(std::move(udp_socket)),
pending_listener_(std::move(pending_listener)) {
DCHECK(client_);
}
UdpSocket::~UdpSocket() = default;
bool UdpSocket::IsIPv4() const {
return local_endpoint_.address.IsV4();
}
bool UdpSocket::IsIPv6() const {
return local_endpoint_.address.IsV6();
}
IPEndpoint UdpSocket::GetLocalEndpoint() const {
return local_endpoint_;
}
void UdpSocket::Bind() {
udp_socket_->Bind(
openscreen_platform::ToNetEndPoint(local_endpoint_),
nullptr /* socket_options */,
base::BindOnce(&UdpSocket::BindCallback, weak_ptr_factory_.GetWeakPtr()));
}
// mojom::UDPSocket doesn't have a concept of network interface indices, so
// this is a noop.
void UdpSocket::SetMulticastOutboundInterface(
openscreen::NetworkInterfaceIndex ifindex) {}
// mojom::UDPSocket doesn't have a concept of network interface indices, so
// the ifindex argument is ignored here.
void UdpSocket::JoinMulticastGroup(const IPAddress& address,
openscreen::NetworkInterfaceIndex ifindex) {
const auto join_address = openscreen_platform::ToNetAddress(address);
udp_socket_->JoinGroup(join_address,
base::BindOnce(&UdpSocket::JoinGroupCallback,
weak_ptr_factory_.GetWeakPtr()));
}
void UdpSocket::SendMessage(ByteView data, const IPEndpoint& dest) {
const auto send_to_address = openscreen_platform::ToNetEndPoint(dest);
base::span<const uint8_t> data_span(data.data(), data.size());
udp_socket_->SendTo(
send_to_address, data_span,
net::MutableNetworkTrafficAnnotationTag(kTrafficAnnotation),
base::BindOnce(&UdpSocket::SendCallback, weak_ptr_factory_.GetWeakPtr()));
}
// mojom::UDPSocket doesn't have a concept of DSCP, so this is a noop.
void UdpSocket::SetDscp(openscreen::UdpSocket::DscpMode state) {}
void UdpSocket::OnReceived(
int32_t net_result,
const std::optional<net::IPEndPoint>& source_endpoint,
std::optional<base::span<const uint8_t>> data) {
if (net_result != net::OK) {
client_->OnRead(this, Error::Code::kSocketReadFailure);
} else if (data) {
UdpPacket packet(data->begin(), data->end());
if (source_endpoint) {
packet.set_source(
openscreen_platform::ToOpenScreenEndPoint(source_endpoint.value()));
}
client_->OnRead(this, std::move(packet));
}
udp_socket_->ReceiveMore(1);
}
void UdpSocket::BindCallback(int32_t result,
const std::optional<net::IPEndPoint>& address) {
if (result != net::OK) {
client_->OnError(this, Error(Error::Code::kSocketBindFailure,
net::ErrorToString(result)));
return;
}
// This is an approximate value for number of packets, and may need to be
// adjusted when we have real world data.
constexpr int kNumPacketsReadyFor = 30;
udp_socket_->ReceiveMore(kNumPacketsReadyFor);
if (address) {
local_endpoint_ =
openscreen_platform::ToOpenScreenEndPoint(address.value());
if (pending_listener_.is_valid()) {
listener_.Bind(std::move(pending_listener_));
}
}
client_->OnBound(this);
}
void UdpSocket::JoinGroupCallback(int32_t result) {
if (result != net::OK) {
client_->OnError(this, Error(Error::Code::kSocketOptionSettingFailure,
net::ErrorToString(result)));
}
}
void UdpSocket::SendCallback(int32_t result) {
if (result != net::OK) {
client_->OnSendError(this, Error(Error::Code::kSocketSendFailure,
net::ErrorToString(result)));
}
}
} // namespace openscreen_platform
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