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// Copyright (c) 2022 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 "quiche/quic/load_balancer/load_balancer_decoder.h"
#include "quiche/quic/load_balancer/load_balancer_server_id.h"
#include "quiche/quic/platform/api/quic_expect_bug.h"
#include "quiche/quic/platform/api/quic_test.h"
#include "quiche/quic/test_tools/quic_test_utils.h"
namespace quic {
namespace test {
namespace {
class LoadBalancerDecoderTest : public QuicTest {};
// Convenience function to shorten the code. Does not check if |array| is long
// enough or |length| is valid for a server ID.
inline LoadBalancerServerId MakeServerId(const uint8_t array[],
const uint8_t length) {
return *LoadBalancerServerId::Create(
absl::Span<const uint8_t>(array, length));
}
constexpr char kRawKey[] = {0x8f, 0x95, 0xf0, 0x92, 0x45, 0x76, 0x5f, 0x80,
0x25, 0x69, 0x34, 0xe5, 0x0c, 0x66, 0x20, 0x7f};
constexpr absl::string_view kKey(kRawKey, kLoadBalancerKeyLen);
constexpr uint8_t kServerId[] = {0xed, 0x79, 0x3a, 0x51, 0xd4, 0x9b, 0x8f, 0x5f,
0xab, 0x65, 0xba, 0x04, 0xc3, 0x33, 0x0a};
struct LoadBalancerDecoderTestCase {
LoadBalancerConfig config;
QuicConnectionId connection_id;
LoadBalancerServerId server_id;
};
TEST_F(LoadBalancerDecoderTest, UnencryptedConnectionIdTestVectors) {
const struct LoadBalancerDecoderTestCase test_vectors[2] = {
{
*LoadBalancerConfig::CreateUnencrypted(0, 3, 4),
QuicConnectionId({0x07, 0xed, 0x79, 0x3a, 0x80, 0x49, 0x71, 0x8a}),
MakeServerId(kServerId, 3),
},
{
*LoadBalancerConfig::CreateUnencrypted(1, 8, 5),
QuicConnectionId({0x4d, 0xed, 0x79, 0x3a, 0x51, 0xd4, 0x9b, 0x8f,
0x5f, 0xee, 0x15, 0xda, 0x27, 0xc4}),
MakeServerId(kServerId, 8),
}};
for (const auto& test : test_vectors) {
LoadBalancerDecoder decoder;
EXPECT_TRUE(decoder.AddConfig(test.config));
EXPECT_EQ(decoder.GetServerId(test.connection_id), test.server_id);
}
}
// Compare test vectors from Appendix B of draft-ietf-quic-load-balancers-12.
TEST_F(LoadBalancerDecoderTest, DecoderTestVectors) {
// Try (1) the "standard" CID length of 8
// (2) server_id_len > nonce_len, so there is a fourth decryption pass
// (3) the single-pass encryption case
// (4) An even total length.
const struct LoadBalancerDecoderTestCase test_vectors[4] = {
{
*LoadBalancerConfig::Create(0, 3, 4, kKey),
QuicConnectionId({0x07, 0xfb, 0xfe, 0x05, 0xf7, 0x31, 0xb4, 0x25}),
MakeServerId(kServerId, 3),
},
{
*LoadBalancerConfig::Create(1, 10, 5, kKey),
QuicConnectionId({0x4f, 0x01, 0x09, 0x56, 0xfb, 0x5c, 0x1d, 0x4d,
0x86, 0xe0, 0x10, 0x18, 0x3e, 0x0b, 0x7d, 0x1e}),
MakeServerId(kServerId, 10),
},
{
*LoadBalancerConfig::Create(2, 8, 8, kKey),
QuicConnectionId({0x90, 0x4d, 0xd2, 0xd0, 0x5a, 0x7b, 0x0d, 0xe9,
0xb2, 0xb9, 0x90, 0x7a, 0xfb, 0x5e, 0xcf, 0x8c,
0xc3}),
MakeServerId(kServerId, 8),
},
{
*LoadBalancerConfig::Create(0, 9, 9, kKey),
QuicConnectionId({0x12, 0x7a, 0x28, 0x5a, 0x09, 0xf8, 0x52, 0x80,
0xf4, 0xfd, 0x6a, 0xbb, 0x43, 0x4a, 0x71, 0x59,
0xe4, 0xd3, 0xeb}),
MakeServerId(kServerId, 9),
},
};
for (const auto& test : test_vectors) {
LoadBalancerDecoder decoder;
EXPECT_TRUE(decoder.AddConfig(test.config));
EXPECT_EQ(decoder.GetServerId(test.connection_id), test.server_id);
}
}
TEST_F(LoadBalancerDecoderTest, NoServerIdEntry) {
auto server_id = LoadBalancerServerId::Create({0x01, 0x02, 0x03});
EXPECT_TRUE(server_id.has_value());
LoadBalancerDecoder decoder;
EXPECT_TRUE(
decoder.AddConfig(*LoadBalancerConfig::CreateUnencrypted(0, 3, 4)));
QuicConnectionId no_server_id_entry(
{0x00, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08});
EXPECT_TRUE(decoder.GetServerId(no_server_id_entry).has_value());
}
TEST_F(LoadBalancerDecoderTest, InvalidConfigId) {
auto server_id = LoadBalancerServerId::Create({0x01, 0x02, 0x03});
EXPECT_TRUE(server_id.has_value());
LoadBalancerDecoder decoder;
EXPECT_TRUE(
decoder.AddConfig(*LoadBalancerConfig::CreateUnencrypted(1, 3, 4)));
QuicConnectionId wrong_config_id(
{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07});
EXPECT_FALSE(decoder
.GetServerId(QuicConnectionId(
{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07}))
.has_value());
}
TEST_F(LoadBalancerDecoderTest, UnroutableCodepoint) {
auto server_id = LoadBalancerServerId::Create({0x01, 0x02, 0x03});
EXPECT_TRUE(server_id.has_value());
LoadBalancerDecoder decoder;
EXPECT_TRUE(
decoder.AddConfig(*LoadBalancerConfig::CreateUnencrypted(1, 3, 4)));
EXPECT_FALSE(decoder
.GetServerId(QuicConnectionId(
{0xc0, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07}))
.has_value());
}
TEST_F(LoadBalancerDecoderTest, UnroutableCodepointAnyLength) {
auto server_id = LoadBalancerServerId::Create({0x01, 0x02, 0x03});
EXPECT_TRUE(server_id.has_value());
LoadBalancerDecoder decoder;
EXPECT_TRUE(
decoder.AddConfig(*LoadBalancerConfig::CreateUnencrypted(1, 3, 4)));
EXPECT_FALSE(decoder.GetServerId(QuicConnectionId({0xff})).has_value());
}
TEST_F(LoadBalancerDecoderTest, ConnectionIdTooShort) {
auto server_id = LoadBalancerServerId::Create({0x01, 0x02, 0x03});
EXPECT_TRUE(server_id.has_value());
LoadBalancerDecoder decoder;
EXPECT_TRUE(
decoder.AddConfig(*LoadBalancerConfig::CreateUnencrypted(0, 3, 4)));
EXPECT_FALSE(decoder
.GetServerId(QuicConnectionId(
{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06}))
.has_value());
}
TEST_F(LoadBalancerDecoderTest, ConnectionIdTooLongIsOK) {
auto server_id = LoadBalancerServerId::Create({0x01, 0x02, 0x03});
LoadBalancerDecoder decoder;
EXPECT_TRUE(
decoder.AddConfig(*LoadBalancerConfig::CreateUnencrypted(0, 3, 4)));
auto server_id_result = decoder.GetServerId(
QuicConnectionId({0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08}));
EXPECT_TRUE(server_id_result.has_value());
EXPECT_EQ(server_id_result, server_id);
}
TEST_F(LoadBalancerDecoderTest, DeleteConfigBadId) {
LoadBalancerDecoder decoder;
decoder.AddConfig(*LoadBalancerConfig::CreateUnencrypted(2, 3, 4));
decoder.DeleteConfig(0);
EXPECT_QUIC_BUG(decoder.DeleteConfig(3),
"Decoder deleting config with invalid config_id 3");
EXPECT_TRUE(decoder
.GetServerId(QuicConnectionId(
{0x80, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07}))
.has_value());
}
TEST_F(LoadBalancerDecoderTest, DeleteConfigGoodId) {
LoadBalancerDecoder decoder;
decoder.AddConfig(*LoadBalancerConfig::CreateUnencrypted(2, 3, 4));
decoder.DeleteConfig(2);
EXPECT_FALSE(decoder
.GetServerId(QuicConnectionId(
{0x80, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07}))
.has_value());
}
// Create two server IDs and make sure the decoder decodes the correct one.
TEST_F(LoadBalancerDecoderTest, TwoServerIds) {
auto server_id1 = LoadBalancerServerId::Create({0x01, 0x02, 0x03});
EXPECT_TRUE(server_id1.has_value());
auto server_id2 = LoadBalancerServerId::Create({0x04, 0x05, 0x06});
LoadBalancerDecoder decoder;
EXPECT_TRUE(
decoder.AddConfig(*LoadBalancerConfig::CreateUnencrypted(0, 3, 4)));
EXPECT_EQ(decoder.GetServerId(QuicConnectionId(
{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07})),
server_id1);
EXPECT_EQ(decoder.GetServerId(QuicConnectionId(
{0x00, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a})),
server_id2);
}
TEST_F(LoadBalancerDecoderTest, GetConfigId) {
EXPECT_FALSE(
LoadBalancerDecoder::GetConfigId(QuicConnectionId()).has_value());
for (uint8_t i = 0; i < 3; i++) {
auto config_id = LoadBalancerDecoder::GetConfigId(
QuicConnectionId({static_cast<unsigned char>(i << 6)}));
EXPECT_TRUE(config_id.has_value());
EXPECT_EQ(*config_id, i);
}
EXPECT_FALSE(
LoadBalancerDecoder::GetConfigId(QuicConnectionId({0xc0})).has_value());
}
} // namespace
} // namespace test
} // namespace quic
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