Allow exception forwarding to the system’s native crash reporter to be disabled

snapshot/mac/crashpad_info_client_options_test.cc

+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// 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 "snapshot/mac/crashpad_info_client_options.h"
+
+#include <dlfcn.h>
+
+#include "base/files/file_path.h"
+#include "client/crashpad_info.h"
+#include "gtest/gtest.h"
+#include "snapshot/mac/process_snapshot_mac.h"
+#include "util/test/paths.h"
+
+namespace crashpad {
+namespace test {
+namespace {
+
+class ScopedSetCrashpadInfoOptionsToDefault {
+ public:
+  explicit ScopedSetCrashpadInfoOptionsToDefault(CrashpadInfo* crashpad_info)
+      : crashpad_info_(crashpad_info) {
+  }
+
+  ~ScopedSetCrashpadInfoOptionsToDefault() {
+    crashpad_info_->set_crashpad_handler_behavior(
+        CrashpadInfo::TriState::kDefault);
+    crashpad_info_->set_system_crash_reporter_forwarding(
+        CrashpadInfo::TriState::kDefault);
+  }
+
+ private:
+  CrashpadInfo* crashpad_info_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedSetCrashpadInfoOptionsToDefault);
+};
+
+TEST(CrashpadInfoClientOptions, OneModule) {
+  // Make sure that the initial state has all values at their defaults.
+  ProcessSnapshotMac process_snapshot;
+  ASSERT_TRUE(process_snapshot.Initialize(mach_task_self()));
+
+  CrashpadInfoClientOptions options;
+  process_snapshot.GetCrashpadOptions(&options);
+
+  EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDefault,
+            options.crashpad_handler_behavior);
+  EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDefault,
+            options.system_crash_reporter_forwarding);
+
+  CrashpadInfo* crashpad_info = CrashpadInfo::GetCrashpadInfo();
+  ASSERT_TRUE(crashpad_info);
+
+  {
+    ScopedSetCrashpadInfoOptionsToDefault restore_defaults(crashpad_info);
+
+    crashpad_info->set_crashpad_handler_behavior(
+        CrashpadInfo::TriState::kEnabled);
+
+    process_snapshot.GetCrashpadOptions(&options);
+    EXPECT_EQ(CrashpadInfoClientOptions::TriState::kEnabled,
+              options.crashpad_handler_behavior);
+    EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDefault,
+              options.system_crash_reporter_forwarding);
+  }
+
+  {
+    ScopedSetCrashpadInfoOptionsToDefault restore_defaults(crashpad_info);
+
+    crashpad_info->set_system_crash_reporter_forwarding(
+        CrashpadInfo::TriState::kDisabled);
+
+    process_snapshot.GetCrashpadOptions(&options);
+    EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDefault,
+              options.crashpad_handler_behavior);
+    EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDisabled,
+              options.system_crash_reporter_forwarding);
+  }
+}
+
+class ScopedDlHandle {
+ public:
+  explicit ScopedDlHandle(void* dl_handle)
+      : dl_handle_(dl_handle) {
+  }
+
+  ~ScopedDlHandle() {
+    if (dl_handle_) {
+      if (dlclose(dl_handle_) != 0) {
+        LOG(ERROR) << "dlclose: " << dlerror();
+      }
+    }
+  }
+
+  bool valid() const { return dl_handle_ != nullptr; }
+
+  template <typename T>
+  T LookUpSymbol(const char* symbol_name) {
+    return reinterpret_cast<T>(dlsym(dl_handle_, symbol_name));
+  }
+
+ private:
+  void* dl_handle_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedDlHandle);
+};
+
+TEST(CrashpadInfoClientOptions, TwoModules) {
+  // Open the module, which has its own CrashpadInfo structure.
+  base::FilePath module_path =
+      Paths::Executable().DirName().Append("crashpad_snapshot_test_module.so");
+  ScopedDlHandle dl_handle(
+      dlopen(module_path.value().c_str(), RTLD_LAZY | RTLD_LOCAL));
+  ASSERT_TRUE(dl_handle.valid()) << "dlopen " << module_path.value() << ": "
+                                 << dlerror();
+
+  // Get the function pointer from the module. This wraps GetCrashpadInfo(), but
+  // because it runs in the module, it returns the remote module’s CrashpadInfo
+  // structure.
+  CrashpadInfo* (*TestModule_GetCrashpadInfo)() =
+      dl_handle.LookUpSymbol<CrashpadInfo* (*)()>("TestModule_GetCrashpadInfo");
+  ASSERT_TRUE(TestModule_GetCrashpadInfo);
+
+  // Make sure that the initial state has all values at their defaults.
+  ProcessSnapshotMac process_snapshot;
+  ASSERT_TRUE(process_snapshot.Initialize(mach_task_self()));
+
+  CrashpadInfoClientOptions options;
+  process_snapshot.GetCrashpadOptions(&options);
+
+  EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDefault,
+            options.crashpad_handler_behavior);
+  EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDefault,
+            options.system_crash_reporter_forwarding);
+
+  // Get both CrashpadInfo structures.
+  CrashpadInfo* local_crashpad_info = CrashpadInfo::GetCrashpadInfo();
+  ASSERT_TRUE(local_crashpad_info);
+
+  CrashpadInfo* remote_crashpad_info = TestModule_GetCrashpadInfo();
+  ASSERT_TRUE(remote_crashpad_info);
+
+  {
+    ScopedSetCrashpadInfoOptionsToDefault restore_local(local_crashpad_info);
+    ScopedSetCrashpadInfoOptionsToDefault restore_remote(remote_crashpad_info);
+
+    // When only one module sets a non-default value, it applies to the entire
+    // process.
+    remote_crashpad_info->set_crashpad_handler_behavior(
+        CrashpadInfo::TriState::kEnabled);
+
+    process_snapshot.GetCrashpadOptions(&options);
+    EXPECT_EQ(CrashpadInfoClientOptions::TriState::kEnabled,
+              options.crashpad_handler_behavior);
+    EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDefault,
+              options.system_crash_reporter_forwarding);
+
+    // When more than one module sets a non-default value, the first one in the
+    // module list applies to the process. The local module should appear before
+    // the remote module, because the local module loaded the remote module.
+    local_crashpad_info->set_crashpad_handler_behavior(
+        CrashpadInfo::TriState::kDisabled);
+
+    process_snapshot.GetCrashpadOptions(&options);
+    EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDisabled,
+              options.crashpad_handler_behavior);
+    EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDefault,
+              options.system_crash_reporter_forwarding);
+  }
+
+  {
+    ScopedSetCrashpadInfoOptionsToDefault restore_local(local_crashpad_info);
+    ScopedSetCrashpadInfoOptionsToDefault restore_remote(remote_crashpad_info);
+
+    // When only one module sets a non-default value, it applies to the entire
+    // process.
+    remote_crashpad_info->set_system_crash_reporter_forwarding(
+        CrashpadInfo::TriState::kDisabled);
+
+    process_snapshot.GetCrashpadOptions(&options);
+    EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDefault,
+              options.crashpad_handler_behavior);
+    EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDisabled,
+              options.system_crash_reporter_forwarding);
+
+    // When more than one module sets a non-default value, the first one in the
+    // module list applies to the process. The local module should appear before
+    // the remote module, because the local module loaded the remote module.
+    local_crashpad_info->set_system_crash_reporter_forwarding(
+        CrashpadInfo::TriState::kEnabled);
+
+    process_snapshot.GetCrashpadOptions(&options);
+    EXPECT_EQ(CrashpadInfoClientOptions::TriState::kDefault,
+              options.crashpad_handler_behavior);
+    EXPECT_EQ(CrashpadInfoClientOptions::TriState::kEnabled,
+              options.system_crash_reporter_forwarding);
+  }
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace crashpad