cmds/idmap2/tests/FileUtilsTests.cpp

/*
 * Copyright (C) 2018 The Android Open Source Project
 *
 * 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 <fcntl.h>

#include <set>
#include <string>

#include "TestHelpers.h"
#include "android-base/macros.h"
#include "android-base/stringprintf.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "idmap2/FileUtils.h"
#include "private/android_filesystem_config.h"

using ::testing::NotNull;

namespace android::idmap2::utils {

TEST(FileUtilsTests, FindFilesFindEverythingNonRecursive) {
  const auto& root = GetTestDataPath();
  auto v = utils::FindFiles(root, false,
                            [](unsigned char type ATTRIBUTE_UNUSED,
                               const std::string& path ATTRIBUTE_UNUSED) -> bool { return true; });
  ASSERT_THAT(v, NotNull());
  ASSERT_EQ(v->size(), 7U);
  ASSERT_EQ(std::set<std::string>(v->begin(), v->end()), std::set<std::string>({
                                                             root + "/.",
                                                             root + "/..",
                                                             root + "/overlay",
                                                             root + "/target",
                                                             root + "/signature-overlay",
                                                             root + "/system-overlay",
                                                             root + "/system-overlay-invalid",
                                                         }));
}

TEST(FileUtilsTests, FindFilesFindApkFilesRecursive) {
  const auto& root = GetTestDataPath();
  auto v = utils::FindFiles(root, true, [](unsigned char type, const std::string& path) -> bool {
    return type == DT_REG && path.size() > 4 && path.compare(path.size() - 4, 4, ".apk") == 0;
  });
  ASSERT_THAT(v, NotNull());
  ASSERT_EQ(v->size(), 11U);
  ASSERT_EQ(std::set<std::string>(v->begin(), v->end()),
            std::set<std::string>(
                {root + "/target/target.apk", root + "/target/target-no-overlayable.apk",
                 root + "/overlay/overlay.apk", root + "/overlay/overlay-no-name.apk",
                 root + "/overlay/overlay-no-name-static.apk", root + "/overlay/overlay-shared.apk",
                 root + "/overlay/overlay-static-1.apk", root + "/overlay/overlay-static-2.apk",
                 root + "/signature-overlay/signature-overlay.apk",
                 root + "/system-overlay/system-overlay.apk",
                 root + "/system-overlay-invalid/system-overlay-invalid.apk"}));
}

TEST(FileUtilsTests, ReadFile) {
  int pipefd[2];
  ASSERT_EQ(pipe2(pipefd, O_CLOEXEC), 0);

  ASSERT_EQ(write(pipefd[1], "foobar", 6), 6);
  close(pipefd[1]);

  auto data = ReadFile(pipefd[0]);
  ASSERT_THAT(data, NotNull());
  ASSERT_EQ(*data, "foobar");
  close(pipefd[0]);
}

#ifdef __ANDROID__
TEST(FileUtilsTests, UidHasWriteAccessToPath) {
  constexpr const char* tmp_path = "/data/local/tmp/test@idmap";
  const std::string cache_path(base::StringPrintf("%s/test@idmap", kIdmapCacheDir));
  const std::string sneaky_cache_path(base::StringPrintf("/data/../%s/test@idmap", kIdmapCacheDir));

  ASSERT_TRUE(UidHasWriteAccessToPath(AID_ROOT, tmp_path));
  ASSERT_TRUE(UidHasWriteAccessToPath(AID_ROOT, cache_path));
  ASSERT_TRUE(UidHasWriteAccessToPath(AID_ROOT, sneaky_cache_path));

  ASSERT_TRUE(UidHasWriteAccessToPath(AID_SYSTEM, tmp_path));
  ASSERT_TRUE(UidHasWriteAccessToPath(AID_SYSTEM, cache_path));
  ASSERT_TRUE(UidHasWriteAccessToPath(AID_SYSTEM, sneaky_cache_path));

  constexpr const uid_t AID_SOME_APP = AID_SYSTEM + 1;
  ASSERT_TRUE(UidHasWriteAccessToPath(AID_SOME_APP, tmp_path));
  ASSERT_FALSE(UidHasWriteAccessToPath(AID_SOME_APP, cache_path));
  ASSERT_FALSE(UidHasWriteAccessToPath(AID_SOME_APP, sneaky_cache_path));
}
#endif

}  // namespace android::idmap2::utils