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/*
* Copyright (C) 2016, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cstddef>
#include <type_traits>
#include "gtest/gtest.h"
#include "wifilogd/protocol.h"
namespace android {
namespace wifilogd {
// The protocol tests aim to provide friction against changes that
// break byte-stream compatibility. Byte-stream compatibility is
// important for two reasons:
// 1. We need to support non-C++ clients. Those clients may use bindings
// that are implemented in their own language, rather than using a
// C or C++ client library.
// 2. We need to maintain compatibility with older clients talking to
// newer versions of wifilogd.
TEST(ProtocolTest, AsciiMessageLayoutIsUnchanged) {
using protocol::AsciiMessage;
ASSERT_TRUE(std::is_standard_layout<AsciiMessage>::value);
EXPECT_EQ(0U, offsetof(AsciiMessage, data_len));
EXPECT_EQ(2U, sizeof(AsciiMessage::data_len));
EXPECT_EQ(2U, offsetof(AsciiMessage, tag_len));
EXPECT_EQ(1U, sizeof(AsciiMessage::tag_len));
EXPECT_EQ(3U, offsetof(AsciiMessage, severity));
EXPECT_EQ(1U, sizeof(AsciiMessage::severity));
EXPECT_EQ(4U, sizeof(AsciiMessage));
}
TEST(ProtocolTest, CommandLayoutIsUnchanged) {
using protocol::Command;
ASSERT_TRUE(std::is_standard_layout<Command>::value);
EXPECT_EQ(0U, offsetof(Command, src_boottime_nsec));
EXPECT_EQ(8U, sizeof(Command::src_boottime_nsec));
EXPECT_EQ(8U, offsetof(Command, sequence_num));
EXPECT_EQ(2U, sizeof(Command::sequence_num));
EXPECT_EQ(10U, offsetof(Command, opcode));
EXPECT_EQ(2U, sizeof(Command::opcode));
EXPECT_EQ(12U, offsetof(Command, payload_len));
EXPECT_EQ(2U, sizeof(Command::payload_len));
// The |reserved| field fills out Command, in place of padding that
// would otherwise be added by the compiler.
EXPECT_EQ(14U, offsetof(Command, reserved));
EXPECT_EQ(2U, sizeof(Command::reserved));
EXPECT_EQ(16U, sizeof(Command));
}
TEST(ProtocolTest, MaxMessageSizeHasNotShrunk) {
EXPECT_GE(protocol::kMaxMessageSize, 4096U);
}
TEST(ProtocolTest, MessageSeveritiesAreUnchanged) {
using protocol::MessageSeverity;
EXPECT_EQ(0U, static_cast<uint8_t>(MessageSeverity::kError));
EXPECT_EQ(1U, static_cast<uint8_t>(MessageSeverity::kWarning));
EXPECT_EQ(2U, static_cast<uint8_t>(MessageSeverity::kInformational));
EXPECT_EQ(3U, static_cast<uint8_t>(MessageSeverity::kTrace));
EXPECT_EQ(4U, static_cast<uint8_t>(MessageSeverity::kDump));
}
TEST(ProtocolTest, OpcodesAreUnchanged) {
using protocol::Opcode;
EXPECT_EQ(2U, sizeof(Opcode));
EXPECT_EQ(0U, static_cast<uint16_t>(Opcode::kWriteAsciiMessage));
EXPECT_EQ(0x20U, static_cast<uint16_t>(Opcode::kDumpBuffers));
}
} // namespace wifilogd
} // namespace android
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