text: /*
   *
   * Copyright 2016 gRPC authors.
   *
   * 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 <dirent.h>
  #include <stdbool.h>
  #include <stdio.h>
  #include <sys/types.h>
  
  #include <gtest/gtest.h>
  
  #include "absl/flags/flag.h"
  
  #include <grpc/grpc.h>
  #include <grpc/support/alloc.h>
  #include <grpc/support/log.h>
  
  #include "src/core/lib/gpr/env.h"
  #include "src/core/lib/iomgr/load_file.h"
  #include "test/core/util/test_config.h"
  #include "test/cpp/util/test_config.h"
  
  extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size);
  extern bool squelch;
  extern bool leak_check;
  
  ABSL_FLAG(std::string, file, "", "Use this file as test data");
  ABSL_FLAG(std::string, directory, "", "Use this directory as test data");
  
  class FuzzerCorpusTest : public ::testing::TestWithParam<std::string> {};
  
  TEST_P(FuzzerCorpusTest, RunOneExample) {
    // Need to call grpc_init() here to use a slice, but need to shut it
    // down before calling LLVMFuzzerTestOneInput(), because most
    // implementations of that function will initialize and shutdown gRPC
    // internally.
    grpc_init();
    gpr_log(GPR_DEBUG, "Example file: %s", GetParam().c_str());
    grpc_slice buffer;
    squelch = false;
    leak_check = false;
    GPR_ASSERT(GRPC_LOG_IF_ERROR("load_file",
                                 grpc_load_file(GetParam().c_str(), 0, &buffer)));
    size_t length = GRPC_SLICE_LENGTH(buffer);
    void* data = gpr_malloc(length);
    memcpy(data, GPR_SLICE_START_PTR(buffer), length);
    grpc_slice_unref(buffer);
    grpc_shutdown();
    LLVMFuzzerTestOneInput(static_cast<uint8_t*>(data), length);
    gpr_free(data);
  }
  
  class ExampleGenerator
      : public ::testing::internal::ParamGeneratorInterface<std::string> {
   public:
    ::testing::internal::ParamIteratorInterface<std::string>* Begin()
        const override;
    ::testing::internal::ParamIteratorInterface<std::string>* End()
        const override;
  
   private:
    void Materialize() const {
      if (examples_.empty()) {
        if (!absl::GetFlag(FLAGS_file).empty()) {
          examples_.push_back(absl::GetFlag(FLAGS_file));
        }
        if (!absl::GetFlag(FLAGS_directory).empty()) {
          char* test_srcdir = gpr_getenv("TEST_SRCDIR");
          gpr_log(GPR_DEBUG, "test_srcdir=\"%s\"", test_srcdir);
          std::string directory = absl::GetFlag(FLAGS_directory);
          if (test_srcdir != nullptr) {
            directory =
                test_srcdir + std::string("/com_github_grpc_grpc/") + directory;
          }
          gpr_log(GPR_DEBUG, "Using corpus directory: %s", directory.c_str());
          DIR* dp;
          struct dirent* ep;
          dp = opendir(directory.c_str());
  
          if (dp != nullptr) {
            while ((ep = readdir(dp)) != nullptr) {
              if (strcmp(ep->d_name, ".") != 0 && strcmp(ep->d_name, "..") != 0) {
                examples_.push_back(directory + "/" + ep->d_name);
              }
            }
  
            (void)closedir(dp);
          } else {
            perror("Couldn't open the directory");
            abort();
          }
          gpr_free(test_srcdir);
        }
      }
      // Make sure we don't succeed without doing anything, which caused
      // us to be blind to our fuzzers not running for 9 months.
      GPR_ASSERT(!examples_.empty());
    }
  
    mutable std::vector<std::string> examples_;
  };
  
  class ExampleIterator
      : public ::testing::internal::ParamIteratorInterface<std::string> {
   public:
    ExampleIterator(const ExampleGenerator& base_,
                    std::vector<std::string>::const_iterator begin)
        : base_(base_), begin_(begin), current_(begin) {}
  
    const ExampleGenerator* BaseGenerator() const override { return &base_; }
  
    void Advance() override { current_++; }
    ExampleIterator* Clone() const override { return new ExampleIterator(*this); }
    const std::string* Current() const override { return &*current_; }
  
    bool Equals(const ParamIteratorInterface<std::string>& other) const override {
      return &base_ == other.BaseGenerator() &&
             current_ == dynamic_cast<const ExampleIterator*>(&other)->current_;
    }
  
   private:
    ExampleIterator(const ExampleIterator& other)
        : base_(other.base_), begin_(other.begin_), current_(other.current_) {}
  
    const ExampleGenerator& base_;
    const std::vector<std::string>::const_iterator begin_;
    std::vector<std::string>::const_iterator current_;
  };
  
  ::testing::internal::ParamIteratorInterface<std::string>*
  ExampleGenerator::Begin() const {
    Materialize();
    return new ExampleIterator(*this, examples_.begin());
  }
  
  ::testing::internal::ParamIteratorInterface<std::string>*
  ExampleGenerator::End() const {
    Materialize();
    return new ExampleIterator(*this, examples_.end());
  }
  
  INSTANTIATE_TEST_SUITE_P(
      CorpusExamples, FuzzerCorpusTest,
      ::testing::internal::ParamGenerator<std::string>(new ExampleGenerator));
  
  int main(int argc, char** argv) {
    grpc::testing::TestEnvironment env(argc, argv);
    grpc::testing::InitTest(&argc, &argv, true);
    ::testing::InitGoogleTest(&argc, argv);
  
    return RUN_ALL_TESTS();
  }
  