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      1 /*
      2  *
      3  * Copyright 2016 gRPC authors.
      4  *
      5  * Licensed under the Apache License, Version 2.0 (the "License");
      6  * you may not use this file except in compliance with the License.
      7  * You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  *
     17  */
     18 
     19 #include <stdbool.h>
     20 
     21 #include <dirent.h>
     22 #include <gflags/gflags.h>
     23 #include <grpc/support/alloc.h>
     24 #include <grpc/support/log.h>
     25 #include <gtest/gtest.h>
     26 #include <stdio.h>
     27 #include <sys/types.h>
     28 
     29 #include "src/core/lib/gpr/env.h"
     30 #include "src/core/lib/iomgr/load_file.h"
     31 #include "test/core/util/test_config.h"
     32 
     33 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size);
     34 extern bool squelch;
     35 extern bool leak_check;
     36 
     37 // In some distros, gflags is in the namespace google, and in some others,
     38 // in gflags. This hack is enabling us to find both.
     39 namespace google {}
     40 namespace gflags {}
     41 using namespace google;
     42 using namespace gflags;
     43 
     44 DEFINE_string(file, "", "Use this file as test data");
     45 DEFINE_string(directory, "", "Use this directory as test data");
     46 
     47 class FuzzerCorpusTest : public ::testing::TestWithParam<std::string> {};
     48 
     49 TEST_P(FuzzerCorpusTest, RunOneExample) {
     50   gpr_log(GPR_DEBUG, "Example file: %s", GetParam().c_str());
     51   grpc_slice buffer;
     52   squelch = false;
     53   leak_check = false;
     54   GPR_ASSERT(GRPC_LOG_IF_ERROR("load_file",
     55                                grpc_load_file(GetParam().c_str(), 0, &buffer)));
     56   LLVMFuzzerTestOneInput(GRPC_SLICE_START_PTR(buffer),
     57                          GRPC_SLICE_LENGTH(buffer));
     58   grpc_slice_unref(buffer);
     59 }
     60 
     61 class ExampleGenerator
     62     : public ::testing::internal::ParamGeneratorInterface<std::string> {
     63  public:
     64   virtual ::testing::internal::ParamIteratorInterface<std::string>* Begin()
     65       const;
     66   virtual ::testing::internal::ParamIteratorInterface<std::string>* End() const;
     67 
     68  private:
     69   void Materialize() const {
     70     if (examples_.empty()) {
     71       if (!FLAGS_file.empty()) examples_.push_back(FLAGS_file);
     72       if (!FLAGS_directory.empty()) {
     73         char* test_srcdir = gpr_getenv("TEST_SRCDIR");
     74         if (test_srcdir != nullptr) {
     75           FLAGS_directory = test_srcdir +
     76                             std::string("/com_github_grpc_grpc/") +
     77                             FLAGS_directory;
     78         }
     79         DIR* dp;
     80         struct dirent* ep;
     81         dp = opendir(FLAGS_directory.c_str());
     82 
     83         if (dp != nullptr) {
     84           while ((ep = readdir(dp)) != nullptr) {
     85             if (ep->d_type == DT_REG) {
     86               examples_.push_back(FLAGS_directory + "/" + ep->d_name);
     87             }
     88           }
     89 
     90           (void)closedir(dp);
     91         } else {
     92           perror("Couldn't open the directory");
     93           abort();
     94         }
     95         gpr_free(test_srcdir);
     96       }
     97     }
     98   }
     99 
    100   mutable std::vector<std::string> examples_;
    101 };
    102 
    103 class ExampleIterator
    104     : public ::testing::internal::ParamIteratorInterface<std::string> {
    105  public:
    106   ExampleIterator(const ExampleGenerator& base_,
    107                   std::vector<std::string>::const_iterator begin)
    108       : base_(base_), begin_(begin), current_(begin) {}
    109 
    110   virtual const ExampleGenerator* BaseGenerator() const { return &base_; }
    111 
    112   virtual void Advance() { current_++; }
    113   virtual ExampleIterator* Clone() const { return new ExampleIterator(*this); }
    114   virtual const std::string* Current() const { return &*current_; }
    115 
    116   virtual bool Equals(const ParamIteratorInterface<std::string>& other) const {
    117     return &base_ == other.BaseGenerator() &&
    118            current_ == dynamic_cast<const ExampleIterator*>(&other)->current_;
    119   }
    120 
    121  private:
    122   ExampleIterator(const ExampleIterator& other)
    123       : base_(other.base_), begin_(other.begin_), current_(other.current_) {}
    124 
    125   const ExampleGenerator& base_;
    126   const std::vector<std::string>::const_iterator begin_;
    127   std::vector<std::string>::const_iterator current_;
    128 };
    129 
    130 ::testing::internal::ParamIteratorInterface<std::string>*
    131 ExampleGenerator::Begin() const {
    132   Materialize();
    133   return new ExampleIterator(*this, examples_.begin());
    134 }
    135 
    136 ::testing::internal::ParamIteratorInterface<std::string>*
    137 ExampleGenerator::End() const {
    138   Materialize();
    139   return new ExampleIterator(*this, examples_.end());
    140 }
    141 
    142 INSTANTIATE_TEST_CASE_P(
    143     CorpusExamples, FuzzerCorpusTest,
    144     ::testing::internal::ParamGenerator<std::string>(new ExampleGenerator));
    145 
    146 int main(int argc, char** argv) {
    147   grpc_test_init(argc, argv);
    148   ParseCommandLineFlags(&argc, &argv, true);
    149   ::testing::InitGoogleTest(&argc, argv);
    150 
    151   return RUN_ALL_TESTS();
    152 }
    153