1 // Copyright 2019 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "cast/common/public/cast_socket.h"
6
7 #include "cast/common/channel/message_framer.h"
8 #include "cast/common/channel/proto/cast_channel.pb.h"
9 #include "util/osp_logging.h"
10
11 namespace openscreen {
12 namespace cast {
13
14 using ::cast::channel::CastMessage;
15 using message_serialization::DeserializeResult;
16
17 CastSocket::Client::~Client() = default;
18
CastSocket(std::unique_ptr<TlsConnection> connection,Client * client)19 CastSocket::CastSocket(std::unique_ptr<TlsConnection> connection,
20 Client* client)
21 : connection_(std::move(connection)),
22 client_(client),
23 socket_id_(g_next_socket_id_++) {
24 OSP_DCHECK(client);
25 connection_->SetClient(this);
26 }
27
~CastSocket()28 CastSocket::~CastSocket() {
29 connection_->SetClient(nullptr);
30 }
31
Send(const CastMessage & message)32 Error CastSocket::Send(const CastMessage& message) {
33 if (state_ == State::kError) {
34 return Error::Code::kSocketClosedFailure;
35 }
36
37 const ErrorOr<std::vector<uint8_t>> out =
38 message_serialization::Serialize(message);
39 if (!out) {
40 return out.error();
41 }
42
43 if (!connection_->Send(out.value().data(), out.value().size())) {
44 return Error::Code::kAgain;
45 }
46 return Error::Code::kNone;
47 }
48
SetClient(Client * client)49 void CastSocket::SetClient(Client* client) {
50 OSP_DCHECK(client);
51 client_ = client;
52 }
53
GetSanitizedIpAddress()54 std::array<uint8_t, 2> CastSocket::GetSanitizedIpAddress() {
55 IPEndpoint remote = connection_->GetRemoteEndpoint();
56 std::array<uint8_t, 2> result;
57 uint8_t bytes[16];
58 if (remote.address.IsV4()) {
59 remote.address.CopyToV4(bytes);
60 result[0] = bytes[2];
61 result[1] = bytes[3];
62 } else {
63 remote.address.CopyToV6(bytes);
64 result[0] = bytes[14];
65 result[1] = bytes[15];
66 }
67 return result;
68 }
69
OnError(TlsConnection * connection,Error error)70 void CastSocket::OnError(TlsConnection* connection, Error error) {
71 state_ = State::kError;
72 client_->OnError(this, error);
73 }
74
OnRead(TlsConnection * connection,std::vector<uint8_t> block)75 void CastSocket::OnRead(TlsConnection* connection, std::vector<uint8_t> block) {
76 read_buffer_.insert(read_buffer_.end(), block.begin(), block.end());
77 // NOTE: Read as many messages as possible out of |read_buffer_| since we only
78 // get one callback opportunity for this.
79 do {
80 ErrorOr<DeserializeResult> message_or_error =
81 message_serialization::TryDeserialize(
82 absl::Span<uint8_t>(&read_buffer_[0], read_buffer_.size()));
83 if (!message_or_error) {
84 return;
85 }
86 read_buffer_.erase(read_buffer_.begin(),
87 read_buffer_.begin() + message_or_error.value().length);
88 client_->OnMessage(this, std::move(message_or_error.value().message));
89 } while (!read_buffer_.empty());
90 }
91
92 int CastSocket::g_next_socket_id_ = 1;
93
94 } // namespace cast
95 } // namespace openscreen
96