diff options
Diffstat (limited to 'cast/sender/channel/cast_framer_unittest.cc')
| -rw-r--r-- | cast/sender/channel/cast_framer_unittest.cc | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/cast/sender/channel/cast_framer_unittest.cc b/cast/sender/channel/cast_framer_unittest.cc new file mode 100644 index 00000000..0cd10c71 --- /dev/null +++ b/cast/sender/channel/cast_framer_unittest.cc @@ -0,0 +1,179 @@ +// 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 "cast/sender/channel/cast_framer.h" + +#include <stddef.h> + +#include <algorithm> +#include <string> + +#include "cast/sender/channel/proto/cast_channel.pb.h" +#include "gtest/gtest.h" +#include "util/big_endian.h" +#include "util/std_util.h" + +namespace cast { +namespace channel { + +using ChannelError = openscreen::Error::Code; + +namespace { + +static constexpr size_t kHeaderSize = sizeof(uint32_t); + +// Cast specifies a max message body size of 64 KiB. +static constexpr size_t kMaxBodySize = 65536; + +} // namespace + +class CastFramerTest : public testing::Test { + public: + CastFramerTest() + : buffer_(kHeaderSize + kMaxBodySize), + framer_(absl::Span<uint8_t>(&buffer_[0], buffer_.size())) {} + + void SetUp() override { + cast_message_.set_protocol_version(CastMessage::CASTV2_1_0); + cast_message_.set_source_id("source"); + cast_message_.set_destination_id("destination"); + cast_message_.set_namespace_("namespace"); + cast_message_.set_payload_type(CastMessage::STRING); + cast_message_.set_payload_utf8("payload"); + ErrorOr<std::string> result = MessageFramer::Serialize(cast_message_); + ASSERT_TRUE(result.is_value()); + cast_message_str_ = std::move(result.value()); + } + + void WriteToBuffer(const std::string& data) { + memcpy(&buffer_[0], data.data(), data.size()); + } + + protected: + CastMessage cast_message_; + std::string cast_message_str_; + std::vector<uint8_t> buffer_; + MessageFramer framer_; +}; + +TEST_F(CastFramerTest, TestMessageFramerCompleteMessage) { + WriteToBuffer(cast_message_str_); + + // Receive 1 byte of the header, framer demands 3 more bytes. + EXPECT_EQ(4u, framer_.BytesRequested().value()); + ErrorOr<CastMessage> result = framer_.TryDeserialize(1); + EXPECT_FALSE(result); + EXPECT_EQ(ChannelError::kInsufficientBuffer, result.error().code()); + EXPECT_EQ(3u, framer_.BytesRequested().value()); + + // TryDeserialize remaining 3, expect that the framer has moved on to + // requesting the body contents. + result = framer_.TryDeserialize(3); + EXPECT_FALSE(result); + EXPECT_EQ(ChannelError::kInsufficientBuffer, result.error().code()); + EXPECT_EQ(cast_message_str_.size() - kHeaderSize, + framer_.BytesRequested().value()); + + // Remainder of packet sent over the wire. + result = framer_.TryDeserialize(framer_.BytesRequested().value()); + ASSERT_TRUE(result); + const CastMessage& message = result.value(); + EXPECT_EQ(message.SerializeAsString(), cast_message_.SerializeAsString()); + EXPECT_EQ(4u, framer_.BytesRequested().value()); +} + +TEST_F(CastFramerTest, BigEndianMessageHeader) { + WriteToBuffer(cast_message_str_); + + EXPECT_EQ(4u, framer_.BytesRequested().value()); + ErrorOr<CastMessage> result = framer_.TryDeserialize(4); + EXPECT_FALSE(result); + EXPECT_EQ(ChannelError::kInsufficientBuffer, result.error().code()); + + const uint32_t expected_size = + openscreen::ReadBigEndian<uint32_t>(openscreen::data(cast_message_str_)); + EXPECT_EQ(expected_size, framer_.BytesRequested().value()); +} + +TEST_F(CastFramerTest, TestSerializeErrorMessageTooLarge) { + CastMessage big_message; + big_message.CopyFrom(cast_message_); + std::string payload; + payload.append(kMaxBodySize + 1, 'x'); + big_message.set_payload_utf8(payload); + EXPECT_FALSE(MessageFramer::Serialize(big_message)); +} + +TEST_F(CastFramerTest, TestCompleteMessageAtOnce) { + WriteToBuffer(cast_message_str_); + + ErrorOr<CastMessage> result = + framer_.TryDeserialize(cast_message_str_.size()); + ASSERT_TRUE(result); + const CastMessage& message = result.value(); + EXPECT_EQ(message.SerializeAsString(), cast_message_.SerializeAsString()); + EXPECT_EQ(4u, framer_.BytesRequested().value()); +} + +TEST_F(CastFramerTest, TestTryDeserializeIllegalLargeMessage) { + std::string mangled_cast_message = cast_message_str_; + mangled_cast_message[0] = 88; + mangled_cast_message[1] = 88; + mangled_cast_message[2] = 88; + mangled_cast_message[3] = 88; + WriteToBuffer(mangled_cast_message); + + EXPECT_EQ(4u, framer_.BytesRequested().value()); + ErrorOr<CastMessage> result = framer_.TryDeserialize(4); + ASSERT_FALSE(result); + EXPECT_EQ(ChannelError::kCastV2InvalidMessage, result.error().code()); + ErrorOr<size_t> bytes_requested = framer_.BytesRequested(); + ASSERT_FALSE(bytes_requested); + EXPECT_EQ(ChannelError::kCastV2InvalidMessage, + bytes_requested.error().code()); +} + +TEST_F(CastFramerTest, TestTryDeserializeIllegalLargeMessage2) { + std::string mangled_cast_message = cast_message_str_; + // Header indicates body size is 0x00010001 = 65537 + mangled_cast_message[0] = 0; + mangled_cast_message[1] = 0x1; + mangled_cast_message[2] = 0; + mangled_cast_message[3] = 0x1; + WriteToBuffer(mangled_cast_message); + + EXPECT_EQ(4u, framer_.BytesRequested().value()); + ErrorOr<CastMessage> result = framer_.TryDeserialize(4); + ASSERT_FALSE(result); + EXPECT_EQ(ChannelError::kCastV2InvalidMessage, result.error().code()); + ErrorOr<size_t> bytes_requested = framer_.BytesRequested(); + ASSERT_FALSE(bytes_requested); + EXPECT_EQ(ChannelError::kCastV2InvalidMessage, + bytes_requested.error().code()); +} + +TEST_F(CastFramerTest, TestUnparsableBodyProto) { + // Message header is OK, but the body is replaced with "x"es. + std::string mangled_cast_message = cast_message_str_; + for (size_t i = kHeaderSize; i < mangled_cast_message.size(); ++i) { + std::fill(mangled_cast_message.begin() + kHeaderSize, + mangled_cast_message.end(), 'x'); + } + WriteToBuffer(mangled_cast_message); + + // Send header. + EXPECT_EQ(4u, framer_.BytesRequested().value()); + ErrorOr<CastMessage> result = framer_.TryDeserialize(4); + EXPECT_FALSE(result); + EXPECT_EQ(ChannelError::kInsufficientBuffer, result.error().code()); + EXPECT_EQ(cast_message_str_.size() - 4, framer_.BytesRequested().value()); + + // Send body, expect an error. + result = framer_.TryDeserialize(framer_.BytesRequested().value()); + ASSERT_FALSE(result); + EXPECT_EQ(ChannelError::kCastV2InvalidMessage, result.error().code()); +} + +} // namespace channel +} // namespace cast |