Introduce RegistrationServer.

handler/win/registration_server_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 "handler/win/registration_server.h"
+
+#include <windows.h>
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/strings/string16.h"
+#include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
+#include "client/crashpad_info.h"
+#include "client/registration_protocol_win.h"
+#include "gtest/gtest.h"
+#include "util/stdlib/pointer_container.h"
+#include "util/thread/thread.h"
+#include "util/win/address_types.h"
+#include "util/win/scoped_handle.h"
+
+namespace crashpad {
+namespace test {
+namespace {
+
+// Simulates a registrar to collect requests from and feed responses to the
+// RegistrationServer.
+class MockDelegate : public RegistrationServer::Delegate {
+ public:
+  // Records a single simulated client registration.
+  struct Entry {
+    Entry(ScopedKernelHANDLE client_process,
+          WinVMAddress crashpad_info_address,
+          HANDLE fake_request_dump_event,
+          HANDLE fake_dump_complete_event)
+        : client_process(client_process.Pass()),
+          crashpad_info_address(crashpad_info_address),
+          fake_request_dump_event_handle(fake_request_dump_event),
+          fake_dump_complete_event_handle(fake_dump_complete_event) {}
+
+    ScopedKernelHANDLE client_process;
+    WinVMAddress crashpad_info_address;
+    HANDLE fake_request_dump_event_handle;
+    HANDLE fake_dump_complete_event_handle;
+  };
+
+  MockDelegate()
+      : started_event_(CreateEvent(nullptr, true, false, nullptr)),
+        registered_processes_(),
+        next_fake_handle_(1),
+        fail_(false) {
+    EXPECT_TRUE(started_event_.is_valid());
+  }
+
+  ~MockDelegate() override {}
+
+  // Blocks until RegistrationServer::Delegate::OnStarted is invoked.
+  void WaitForStart() {
+    DWORD wait_result = WaitForSingleObject(started_event_.get(), INFINITE);
+    if (wait_result == WAIT_FAILED)
+      PLOG(ERROR);
+    ASSERT_EQ(wait_result, WAIT_OBJECT_0);
+  }
+
+  // RegistrationServer::Delegate:
+  void OnStarted() override {
+    EXPECT_EQ(WAIT_TIMEOUT, WaitForSingleObject(started_event_.get(), 0));
+    SetEvent(started_event_.get());
+  }
+
+  bool RegisterClient(ScopedKernelHANDLE client_process,
+                      WinVMAddress crashpad_info_address,
+                      HANDLE* request_dump_event,
+                      HANDLE* dump_complete_event) override {
+    if (fail_)
+      return false;
+
+    if (!request_dump_event || !dump_complete_event) {
+      ADD_FAILURE() << "NULL 'out' parameter.";
+      return false;
+    }
+    *request_dump_event = reinterpret_cast<HANDLE>(next_fake_handle_++);
+    *dump_complete_event = reinterpret_cast<HANDLE>(next_fake_handle_++);
+
+    registered_processes_.push_back(new Entry(client_process.Pass(),
+                                              crashpad_info_address,
+                                              *request_dump_event,
+                                              *dump_complete_event));
+    return true;
+  }
+
+  // Provides access to the registered process data.
+  const std::vector<Entry*> registered_processes() {
+    return registered_processes_;
+  }
+
+  // If true, causes RegisterClient to simulate registration failure.
+  void set_fail_mode(bool fail) { fail_ = fail; }
+
+ private:
+  ScopedKernelHANDLE started_event_;
+  PointerVector<Entry> registered_processes_;
+  int next_fake_handle_;
+  bool fail_;
+
+  DISALLOW_COPY_AND_ASSIGN(MockDelegate);
+};
+
+// Verifies that the request and response match what was received and sent by
+// the MockDelegate.
+void VerifyRegistration(const MockDelegate::Entry& registered_process,
+                        const RegistrationRequest& request,
+                        const RegistrationResponse& response) {
+  EXPECT_EQ(request.crashpad_info_address,
+            registered_process.crashpad_info_address);
+  EXPECT_EQ(registered_process.fake_request_dump_event_handle,
+            response.request_report_event);
+  EXPECT_EQ(registered_process.fake_dump_complete_event_handle,
+            response.report_complete_event);
+  EXPECT_EQ(request.client_process_id,
+            GetProcessId(registered_process.client_process.get()));
+}
+
+// Runs the RegistrationServer on a background thread.
+class RunServerThread : public Thread {
+ public:
+  // Instantiates a thread which will invoke server->Run(pipe_name, delegate).
+  RunServerThread(RegistrationServer* server,
+                  const base::string16& pipe_name,
+                  RegistrationServer::Delegate* delegate)
+      : server_(server), pipe_name_(pipe_name), delegate_(delegate) {}
+  ~RunServerThread() override {}
+
+ private:
+  // Thread:
+  void ThreadMain() override { server_->Run(pipe_name_, delegate_); }
+
+  RegistrationServer* server_;
+  base::string16 pipe_name_;
+  RegistrationServer::Delegate* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(RunServerThread);
+};
+
+class RegistrationServerTest : public testing::Test {
+ public:
+  RegistrationServerTest()
+      : server_(),
+        pipe_name_(L"\\\\.\\pipe\\registration_server_test_pipe_" +
+                   base::UTF8ToUTF16(
+                       base::StringPrintf("%08x", GetCurrentProcessId()))),
+        delegate_(),
+        server_thread_(&server_, pipe_name_, &delegate_) {}
+
+  RegistrationServer& server() { return server_; }
+  MockDelegate& delegate() { return delegate_; }
+  Thread& server_thread() { return server_thread_; }
+
+  // Returns a pipe handle connected to the RegistrationServer.
+  ScopedFileHANDLE Connect() {
+    ScopedFileHANDLE pipe;
+    const int kMaxRetries = 5;
+    for (int retries = 0; !pipe.is_valid() && retries < kMaxRetries;
+         ++retries) {
+      if (!WaitNamedPipe(pipe_name_.c_str(), NMPWAIT_WAIT_FOREVER))
+        break;
+      pipe.reset(CreateFile(pipe_name_.c_str(),
+                              GENERIC_READ | GENERIC_WRITE,

[scottmg, 2015/05/21 02:32:36]

Wrong indent (fyi, there's a .clang-format in the project root)

[erikwright (departed), 2015/05/21 15:12:38]

Sorry, oversight from removing leading '::'.

+                              0,
+                              NULL,
+                              OPEN_EXISTING,
+                              SECURITY_SQOS_PRESENT | SECURITY_IDENTIFICATION,
+                              NULL));
+    }
+    EXPECT_TRUE(pipe.is_valid());
+    return pipe.Pass();
+  }
+
+  // Sends the provided request and receives a response via the provided pipe.
+  bool SendRequest(ScopedFileHANDLE pipe,
+                   const void* request_buffer,
+                   size_t request_size,
+                   RegistrationResponse* response) {
+    DWORD mode = PIPE_READMODE_MESSAGE;
+    SetNamedPipeHandleState(pipe.get(), &mode, NULL, NULL);
+    DWORD bytes_read = 0;
+    if (TransactNamedPipe(pipe.get(),
+                            const_cast<void*>(request_buffer),

[scottmg, 2015/05/21 02:32:37]

wrong indent

[erikwright (departed), 2015/05/21 15:12:38]

Done.

+                            static_cast<DWORD>(request_size),
+                            response,
+                            sizeof(*response),
+                            &bytes_read,
+                            NULL)) {
+      if (bytes_read == sizeof(*response))
+        return true;
+    }
+    return false;
+  }
+
+ private:
+  RegistrationServer server_;
+  base::string16 pipe_name_;
+  MockDelegate delegate_;
+  RunServerThread server_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(RegistrationServerTest);
+};
+
+// During destruction, ensures that the server is stopped and the background
+// thread joined.
+class ScopedStopServerAndJoinThread {
+ public:
+  explicit ScopedStopServerAndJoinThread(RegistrationServer* server,
+                                         Thread* thread)
+      : server_(server), thread_(thread) {}
+  ~ScopedStopServerAndJoinThread() {
+    server_->Stop();
+    thread_->Join();
+  }
+
+ private:
+  RegistrationServer* server_;
+  Thread* thread_;
+  DISALLOW_COPY_AND_ASSIGN(ScopedStopServerAndJoinThread);
+};
+
+TEST_F(RegistrationServerTest, Instantiate) {
+}
+
+TEST_F(RegistrationServerTest, StartAndStop) {
+  server_thread().Start();
+  ScopedStopServerAndJoinThread scoped_stop_server_and_join_thread(
+      &server(), &server_thread());
+  ASSERT_NO_FATAL_FAILURE(delegate().WaitForStart());
+}
+
+TEST_F(RegistrationServerTest, StopWhileConnected) {
+  ScopedFileHANDLE connection;
+  {
+    server_thread().Start();
+    ScopedStopServerAndJoinThread scoped_stop_server_and_join_thread(
+        &server(), &server_thread());
+    ASSERT_NO_FATAL_FAILURE(delegate().WaitForStart());
+    connection = Connect();
+    ASSERT_TRUE(connection.is_valid());
+    // Leaving this scope causes the server to be stopped, while the connection
+    // is still open.
+  }
+}
+
+TEST_F(RegistrationServerTest, Register) {
+  RegistrationRequest request = {0};
+  RegistrationResponse response = {0};
+  CrashpadInfo crashpad_info;
+  request.client_process_id = GetCurrentProcessId();
+  request.crashpad_info_address =
+      reinterpret_cast<WinVMAddress>(&crashpad_info);
+
+  server_thread().Start();
+  ScopedStopServerAndJoinThread scoped_stop_server_and_join_thread(
+      &server(), &server_thread());
+
+  ASSERT_NO_FATAL_FAILURE(delegate().WaitForStart());
+
+  ASSERT_TRUE(SendRequest(Connect(), &request, sizeof(request), &response));
+
+  ASSERT_EQ(1, delegate().registered_processes().size());
+  VerifyRegistration(*delegate().registered_processes()[0], request, response);
+}
+
+TEST_F(RegistrationServerTest, ForgedClientId) {
+  // Skip this test on pre-Vista as the forged PID detection is not supported
+  // there.
+  OSVERSIONINFO vi = {0};
+  vi.dwOSVersionInfoSize = sizeof(vi);
+  GetVersionEx(&vi);
+  if (vi.dwMajorVersion < 6)
+    return;
+
+  RegistrationRequest request = {0};
+  RegistrationResponse response = {0};
+  CrashpadInfo crashpad_info;
+  // Note that we forge the PID here.
+  request.client_process_id = GetCurrentProcessId() + 1;
+  request.crashpad_info_address =
+      reinterpret_cast<WinVMAddress>(&crashpad_info);
+
+  server_thread().Start();
+  ScopedStopServerAndJoinThread scoped_stop_server_and_join_thread(
+      &server(), &server_thread());
+
+  ASSERT_NO_FATAL_FAILURE(delegate().WaitForStart());
+
+  ASSERT_FALSE(SendRequest(Connect(), &request, sizeof(request), &response));
+  ASSERT_EQ(0, delegate().registered_processes().size());
+
+  // Correct the PID and verify that this was the only reason we failed.
+  request.client_process_id = GetCurrentProcessId();
+  ASSERT_TRUE(SendRequest(Connect(), &request, sizeof(request), &response));
+  ASSERT_EQ(1, delegate().registered_processes().size());
+  VerifyRegistration(*delegate().registered_processes()[0], request, response);
+}
+
+TEST_F(RegistrationServerTest, RegisterClientFails) {
+  RegistrationRequest request = {0};
+  RegistrationResponse response = {0};
+  CrashpadInfo crashpad_info;
+  request.client_process_id = GetCurrentProcessId();
+  request.crashpad_info_address =
+      reinterpret_cast<WinVMAddress>(&crashpad_info);
+
+  server_thread().Start();
+  ScopedStopServerAndJoinThread scoped_stop_server_and_join_thread(
+      &server(), &server_thread());
+
+  ASSERT_NO_FATAL_FAILURE(delegate().WaitForStart());
+
+  // Simulate some failures
+  delegate().set_fail_mode(true);
+  for (int i = 0; i < 10; ++i) {
+    ASSERT_FALSE(SendRequest(Connect(), &request, sizeof(request), &response));
+    ASSERT_EQ(0, delegate().registered_processes().size());
+  }
+
+  // Now verify that a valid response may still be processed.
+  delegate().set_fail_mode(false);
+  ASSERT_TRUE(SendRequest(Connect(), &request, sizeof(request), &response));
+
+  ASSERT_EQ(1, delegate().registered_processes().size());
+  VerifyRegistration(*delegate().registered_processes()[0], request, response);
+}
+
+TEST_F(RegistrationServerTest, BadRequests) {
+  server_thread().Start();
+  ScopedStopServerAndJoinThread scoped_stop_server_and_join_thread(
+      &server(), &server_thread());
+  ASSERT_NO_FATAL_FAILURE(delegate().WaitForStart());
+
+  RegistrationRequest request = {0};
+  RegistrationResponse response = {0};
+  CrashpadInfo crashpad_info;
+  request.client_process_id = GetCurrentProcessId();
+  request.crashpad_info_address =
+      reinterpret_cast<WinVMAddress>(&crashpad_info);
+
+  // Concatenate a valid request with a single byte of garbage.
+  std::vector<char> extra_long;
+  extra_long.insert(extra_long.begin(),
+                    reinterpret_cast<char*>(&request),
+                    reinterpret_cast<char*>(&request) + sizeof(request));
+  extra_long.push_back('x');
+
+  for (int i = 0; i < 10; ++i) {
+    ASSERT_FALSE(SendRequest(Connect(), "a", 1, &response));
+    ASSERT_FALSE(SendRequest(
+        Connect(), extra_long.data(), extra_long.size(), &response));
+    ASSERT_TRUE(Connect().is_valid());
+  }
+
+  // Now verify that a valid response may still be processed.
+
+  ASSERT_TRUE(SendRequest(Connect(), &request, sizeof(request), &response));
+
+  ASSERT_EQ(1, delegate().registered_processes().size());
+  VerifyRegistration(*delegate().registered_processes()[0], request, response);
+}
+
+TEST_F(RegistrationServerTest, OverlappingRequests) {
+  server_thread().Start();
+  ScopedStopServerAndJoinThread scoped_stop_server_and_join_thread(
+      &server(), &server_thread());
+  ASSERT_NO_FATAL_FAILURE(delegate().WaitForStart());
+
+  RegistrationRequest request = {0};
+  RegistrationResponse response_1 = {0};
+  RegistrationResponse response_2 = {0};
+  RegistrationResponse response_3 = {0};
+  CrashpadInfo crashpad_info;
+  request.client_process_id = GetCurrentProcessId();
+  request.crashpad_info_address =
+      reinterpret_cast<WinVMAddress>(&crashpad_info);
+
+  ScopedFileHANDLE connection_1 = Connect();
+  ASSERT_TRUE(connection_1.is_valid());
+  ScopedFileHANDLE connection_2 = Connect();
+  ASSERT_TRUE(connection_2.is_valid());
+  ScopedFileHANDLE connection_3 = Connect();
+  ASSERT_TRUE(connection_3.is_valid());
+
+  ASSERT_FALSE(SendRequest(connection_1.Pass(), "a", 1, &response_1));
+
+  ASSERT_TRUE(
+      SendRequest(connection_2.Pass(), &request, sizeof(request), &response_2));
+
+  ASSERT_TRUE(Connect().is_valid());
+
+  ASSERT_TRUE(
+      SendRequest(connection_3.Pass(), &request, sizeof(request), &response_3));
+
+  ASSERT_EQ(2, delegate().registered_processes().size());
+  VerifyRegistration(
+      *delegate().registered_processes()[0], request, response_2);
+  VerifyRegistration(
+      *delegate().registered_processes()[1], request, response_3);
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace crashpad