1    :  // Copyright 2011 Google Inc.
   2    :  //
   3    :  // Licensed under the Apache License, Version 2.0 (the "License");
   4    :  // you may not use this file except in compliance with the License.
   5    :  // You may obtain a copy of the License at
   6    :  //
   7    :  //     http://www.apache.org/licenses/LICENSE-2.0
   8    :  //
   9    :  // Unless required by applicable law or agreed to in writing, software
  10    :  // distributed under the License is distributed on an "AS IS" BASIS,
  11    :  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    :  // See the License for the specific language governing permissions and
  13    :  // limitations under the License.
  14    :  
  15    :  #include "syzygy/pe/pe_file_writer.h"
  16    :  
  17    :  #include "base/file_util.h"
  18    :  #include "base/path_service.h"
  19    :  #include "gtest/gtest.h"
  20    :  #include "gmock/gmock.h"
  21    :  #include "syzygy/core/unittest_util.h"
  22    :  #include "syzygy/pe/decomposer.h"
  23    :  #include "syzygy/pe/pe_file.h"
  24    :  #include "syzygy/pe/unittest_util.h"
  25    :  
  26    :  namespace pe {
  27    :  
  28    :  namespace {
  29    :  
  30    :  class PEFileWriterTest: public testing::PELibUnitTest {
  31    :    // Add customizations here.
  32    :  };
  33    :  
  34    :  }  // namespace
  35    :  
  36  E :  TEST_F(PEFileWriterTest, LoadOriginalImage) {
  37    :    // This test baselines the other test(s) that operate on mutated, copied
  38    :    // versions of the DLLs.
  39  E :    FilePath image_path(testing::GetExeRelativePath(kDllName));
  40  E :    ASSERT_NO_FATAL_FAILURE(CheckTestDll(image_path));
  41  E :  }
  42    :  
  43  E :  TEST_F(PEFileWriterTest, RewriteAndLoadImage) {
  44    :    // Create a temporary file we can write the new image to.
  45  E :    FilePath temp_dir;
  46  E :    ASSERT_NO_FATAL_FAILURE(CreateTemporaryDir(&temp_dir));
  47  E :    FilePath temp_file = temp_dir.Append(kDllName);
  48    :  
  49    :    // Decompose the original test image.
  50  E :    PEFile image_file;
  51  E :    FilePath image_path(testing::GetExeRelativePath(kDllName));
  52  E :    ASSERT_TRUE(image_file.Init(image_path));
  53    :  
  54  E :    Decomposer decomposer(image_file);
  55  E :    block_graph::BlockGraph block_graph;
  56  E :    pe::ImageLayout image_layout(&block_graph);
  57  E :    ASSERT_TRUE(decomposer.Decompose(&image_layout));
  58    :  
  59  E :    PEFileWriter writer(image_layout);
  60    :  
  61  E :    ASSERT_TRUE(writer.WriteImage(temp_file));
  62  E :    ASSERT_NO_FATAL_FAILURE(CheckTestDll(temp_file));
  63  E :  }
  64    :  
  65  E :  TEST_F(PEFileWriterTest, UpdateFileChecksum) {
  66  E :    FilePath temp_dir;
  67  E :    ASSERT_NO_FATAL_FAILURE(CreateTemporaryDir(&temp_dir));
  68    :  
  69    :    // Verify that the function fails on non-existent paths.
  70  E :    FilePath executable = temp_dir.Append(L"executable_file.exe");
  71  E :    EXPECT_FALSE(PEFileWriter::UpdateFileChecksum(executable));
  72    :  
  73    :    // Verify that the function fails for non-image files.
  74  E :    file_util::ScopedFILE file(file_util::OpenFile(executable, "wb"));
  75    :    // Grow the file to 16K.
  76  E :    ASSERT_EQ(0, fseek(file.get(), 16 * 1024, SEEK_SET));
  77  E :    file.reset();
  78  E :    EXPECT_FALSE(PEFileWriter::UpdateFileChecksum(executable));
  79    :  
  80    :    // Make a copy of our test DLL and check that we work on that.
  81  E :    FilePath input_path(testing::GetExeRelativePath(kDllName));
  82  E :    FilePath image_path(temp_dir.Append(kDllName));
  83  E :    EXPECT_TRUE(file_util::CopyFile(input_path, image_path));
  84  E :    EXPECT_TRUE(PEFileWriter::UpdateFileChecksum(image_path));
  85  E :  }
  86    :  
  87    :  }  // namespace pe