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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_sender.h"
#include <memory>
#include <vector>
#include "discovery/mdns/mdns_records.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "platform/test/fake_udp_socket.h"
#include "platform/test/mock_udp_socket.h"
namespace openscreen {
namespace discovery {
using testing::_;
using testing::Args;
using testing::Return;
using testing::StrictMock;
using testing::WithArgs;
namespace {
ACTION_P(VoidPointerMatchesBytes, expected_data) {
const uint8_t* actual_data = static_cast<const uint8_t*>(arg0);
for (size_t i = 0; i < expected_data.size(); ++i) {
EXPECT_EQ(actual_data[i], expected_data[i]);
}
}
} // namespace
class MdnsSenderTest : public testing::Test {
public:
MdnsSenderTest()
: a_question_(DomainName{"testing", "local"},
DnsType::kA,
DnsClass::kIN,
ResponseType::kMulticast),
a_record_(DomainName{"testing", "local"},
DnsType::kA,
DnsClass::kIN,
RecordType::kShared,
std::chrono::seconds(120),
ARecordRdata(IPAddress{172, 0, 0, 1})),
query_message_(1, MessageType::Query),
response_message_(1, MessageType::Response),
ipv4_multicast_endpoint_{
.address = IPAddress(kDefaultMulticastGroupIPv4),
.port = kDefaultMulticastPort},
ipv6_multicast_endpoint_{
.address = IPAddress(kDefaultMulticastGroupIPv6),
.port = kDefaultMulticastPort} {
query_message_.AddQuestion(a_question_);
response_message_.AddAnswer(a_record_);
}
protected:
// clang-format off
const std::vector<uint8_t> kQueryBytes = {
0x00, 0x01, // ID = 1
0x00, 0x00, // FLAGS = None
0x00, 0x01, // Question count
0x00, 0x00, // Answer count
0x00, 0x00, // Authority count
0x00, 0x00, // Additional count
// Question
0x07, 't', 'e', 's', 't', 'i', 'n', 'g',
0x05, 'l', 'o', 'c', 'a', 'l',
0x00,
0x00, 0x01, // TYPE = A (1)
0x00, 0x01, // CLASS = IN (1)
};
const std::vector<uint8_t> kResponseBytes = {
0x00, 0x01, // ID = 1
0x84, 0x00, // FLAGS = AA | RESPONSE
0x00, 0x00, // Question count
0x00, 0x01, // Answer count
0x00, 0x00, // Authority count
0x00, 0x00, // Additional count
// Answer
0x07, 't', 'e', 's', 't', 'i', 'n', 'g',
0x05, 'l', 'o', 'c', 'a', 'l',
0x00,
0x00, 0x01, // TYPE = A (1)
0x00, 0x01, // CLASS = IN (1)
0x00, 0x00, 0x00, 0x78, // TTL = 120 seconds
0x00, 0x04, // RDLENGTH = 4 bytes
0xac, 0x00, 0x00, 0x01, // 172.0.0.1
};
// clang-format on
MdnsQuestion a_question_;
MdnsRecord a_record_;
MdnsMessage query_message_;
MdnsMessage response_message_;
IPEndpoint ipv4_multicast_endpoint_;
IPEndpoint ipv6_multicast_endpoint_;
};
TEST_F(MdnsSenderTest, SendMulticast) {
StrictMock<MockUdpSocket> socket;
EXPECT_CALL(socket, IsIPv4()).WillRepeatedly(Return(true));
EXPECT_CALL(socket, IsIPv6()).WillRepeatedly(Return(true));
MdnsSender sender(&socket);
EXPECT_CALL(socket, SendMessage(_, kQueryBytes.size(), _))
.WillOnce(WithArgs<0>(VoidPointerMatchesBytes(kQueryBytes)));
EXPECT_EQ(sender.SendMulticast(query_message_), Error::Code::kNone);
}
TEST_F(MdnsSenderTest, SendUnicastIPv4) {
IPEndpoint endpoint{.address = IPAddress{192, 168, 1, 1}, .port = 31337};
StrictMock<MockUdpSocket> socket;
MdnsSender sender(&socket);
EXPECT_CALL(socket, SendMessage(_, kResponseBytes.size(), _))
.WillOnce(WithArgs<0>(VoidPointerMatchesBytes(kResponseBytes)));
EXPECT_EQ(sender.SendMessage(response_message_, endpoint),
Error::Code::kNone);
}
TEST_F(MdnsSenderTest, SendUnicastIPv6) {
constexpr uint16_t kIPv6AddressHextets[] = {
0xfe80, 0x0000, 0x0000, 0x0000, 0x0202, 0xb3ff, 0xfe1e, 0x8329,
};
IPEndpoint endpoint{.address = IPAddress(kIPv6AddressHextets), .port = 31337};
StrictMock<MockUdpSocket> socket;
MdnsSender sender(&socket);
EXPECT_CALL(socket, SendMessage(_, kResponseBytes.size(), _))
.WillOnce(WithArgs<0>(VoidPointerMatchesBytes(kResponseBytes)));
EXPECT_EQ(sender.SendMessage(response_message_, endpoint),
Error::Code::kNone);
}
TEST_F(MdnsSenderTest, MessageTooBig) {
MdnsMessage big_message_(1, MessageType::Query);
for (size_t i = 0; i < 100; ++i) {
big_message_.AddQuestion(a_question_);
big_message_.AddAnswer(a_record_);
}
StrictMock<MockUdpSocket> socket;
EXPECT_CALL(socket, IsIPv4()).WillRepeatedly(Return(true));
EXPECT_CALL(socket, IsIPv6()).WillRepeatedly(Return(true));
MdnsSender sender(&socket);
EXPECT_EQ(sender.SendMulticast(big_message_),
Error::Code::kInsufficientBuffer);
}
TEST_F(MdnsSenderTest, ReturnsErrorOnSocketFailure) {
FakeUdpSocket::MockClient socket_client;
FakeUdpSocket socket(nullptr, &socket_client);
MdnsSender sender(&socket);
Error error = Error(Error::Code::kConnectionFailed, "error message");
socket.EnqueueSendResult(error);
EXPECT_CALL(socket_client, OnSendError(_, error)).Times(1);
EXPECT_EQ(sender.SendMulticast(query_message_), Error::Code::kNone);
EXPECT_EQ(socket.send_queue_size(), size_t{0});
}
} // namespace discovery
} // namespace openscreen
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