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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/spdy/fuzzing/hpack_fuzz_util.h"
#include <map>
#include "base/base_paths.h"
#include "base/files/file.h"
#include "base/files/file_util.h"
#include "base/path_service.h"
#include "net/base/hex_utils.h"
#include "net/third_party/quiche/src/quiche/common/http/http_header_block.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace spdy::test {
using quiche::HttpHeaderBlock;
using std::map;
TEST(HpackFuzzUtilTest, GeneratorContextInitialization) {
HpackFuzzUtil::GeneratorContext context;
HpackFuzzUtil::InitializeGeneratorContext(&context);
// Context was seeded with initial name & value fixtures.
EXPECT_LT(0u, context.names.size());
EXPECT_LT(0u, context.values.size());
}
TEST(HpackFuzzUtil, GeneratorContextExpansion) {
HpackFuzzUtil::GeneratorContext context;
HttpHeaderBlock headers = HpackFuzzUtil::NextGeneratedHeaderSet(&context);
// Headers were generated, and the generator context was expanded.
EXPECT_LT(0u, headers.size());
EXPECT_LT(0u, context.names.size());
EXPECT_LT(0u, context.values.size());
}
// TODO(jgraettinger): A better test would mock a random generator and
// evaluate SampleExponential along fixed points of the [0,1] domain.
TEST(HpackFuzzUtilTest, SampleExponentialRegression) {
// TODO(jgraettinger): Upstream uses a seeded random generator here to pin
// the behavior of SampleExponential. Chromium's random generation utilities
// are strongly secure, but provide no way to seed the generator.
for (size_t i = 0; i != 100; ++i) {
EXPECT_GE(30u, HpackFuzzUtil::SampleExponential(10, 30));
}
}
TEST(HpackFuzzUtilTest, ParsesSequenceOfHeaderBlocks) {
char fixture[] =
"\x00\x00\x00\x05"
"aaaaa"
"\x00\x00\x00\x04"
"bbbb"
"\x00\x00\x00\x03"
"ccc"
"\x00\x00\x00\x02"
"dd"
"\x00\x00\x00\x01"
"e"
"\x00\x00\x00\x00"
""
"\x00\x00\x00\x03"
"fin";
HpackFuzzUtil::Input input;
input.input.assign(fixture, std::size(fixture) - 1);
std::string_view block;
EXPECT_TRUE(HpackFuzzUtil::NextHeaderBlock(&input, &block));
EXPECT_EQ("aaaaa", block);
EXPECT_TRUE(HpackFuzzUtil::NextHeaderBlock(&input, &block));
EXPECT_EQ("bbbb", block);
EXPECT_TRUE(HpackFuzzUtil::NextHeaderBlock(&input, &block));
EXPECT_EQ("ccc", block);
EXPECT_TRUE(HpackFuzzUtil::NextHeaderBlock(&input, &block));
EXPECT_EQ("dd", block);
EXPECT_TRUE(HpackFuzzUtil::NextHeaderBlock(&input, &block));
EXPECT_EQ("e", block);
EXPECT_TRUE(HpackFuzzUtil::NextHeaderBlock(&input, &block));
EXPECT_EQ("", block);
EXPECT_TRUE(HpackFuzzUtil::NextHeaderBlock(&input, &block));
EXPECT_EQ("fin", block);
EXPECT_FALSE(HpackFuzzUtil::NextHeaderBlock(&input, &block));
}
TEST(HpackFuzzUtilTest, SerializedHeaderBlockPrefixes) {
EXPECT_EQ(std::string("\x00\x00\x00\x00", 4),
HpackFuzzUtil::HeaderBlockPrefix(0));
EXPECT_EQ(std::string("\x00\x00\x00\x05", 4),
HpackFuzzUtil::HeaderBlockPrefix(5));
EXPECT_EQ("\x4f\xb3\x0a\x91", HpackFuzzUtil::HeaderBlockPrefix(1337133713));
}
TEST(HpackFuzzUtilTest, PassValidInputThroughAllStages) {
// Example lifted from HpackDecoderTest.SectionD4RequestHuffmanExamples.
std::string input = net::HexDecode("828684418cf1e3c2e5f23a6ba0ab90f4ff");
HpackFuzzUtil::FuzzerContext context;
HpackFuzzUtil::InitializeFuzzerContext(&context);
EXPECT_TRUE(
HpackFuzzUtil::RunHeaderBlockThroughFuzzerStages(&context, input));
HttpHeaderBlock expect;
expect[":method"] = "GET";
expect[":scheme"] = "http";
expect[":path"] = "/";
expect[":authority"] = "www.example.com";
EXPECT_EQ(expect, context.third_stage_handler->decoded_block());
}
TEST(HpackFuzzUtilTest, ValidFuzzExamplesRegressionTest) {
base::FilePath source_root;
ASSERT_TRUE(
base::PathService::Get(base::DIR_SRC_TEST_DATA_ROOT, &source_root));
// Load the example fixtures versioned with the source tree.
HpackFuzzUtil::Input input;
ASSERT_TRUE(base::ReadFileToString(
source_root.Append(FILE_PATH_LITERAL("net"))
.Append(FILE_PATH_LITERAL("data"))
.Append(FILE_PATH_LITERAL("spdy_tests"))
.Append(FILE_PATH_LITERAL("examples_07.hpack")),
&input.input));
HpackFuzzUtil::FuzzerContext context;
HpackFuzzUtil::InitializeFuzzerContext(&context);
std::string_view block;
while (HpackFuzzUtil::NextHeaderBlock(&input, &block)) {
// As these are valid examples, all fuzz stages should succeed.
EXPECT_TRUE(
HpackFuzzUtil::RunHeaderBlockThroughFuzzerStages(&context, block));
}
}
TEST(HpackFuzzUtilTest, FlipBitsMutatesBuffer) {
char buffer[] = "testbuffer1234567890";
std::string unmodified(buffer, std::size(buffer) - 1);
EXPECT_EQ(unmodified, buffer);
HpackFuzzUtil::FlipBits(reinterpret_cast<uint8_t*>(buffer),
std::size(buffer) - 1, 1);
EXPECT_NE(unmodified, buffer);
}
} // namespace spdy::test
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