Add support for sockets that can listen and accept a connection.

ipc/ipc_channel_posix_unittest.cc

Index: ipc/ipc_channel_posix_unittest.cc
diff --git a/ipc/ipc_channel_posix_unittest.cc b/ipc/ipc_channel_posix_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..09c635fe53a793a4b042d55c6a1f8dc96791cd55
--- /dev/null
+++ b/ipc/ipc_channel_posix_unittest.cc
@@ -0,0 +1,355 @@
+// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// These tests are POSIX only.
+
+#include "ipc/ipc_channel_posix.h"
+
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+#include "base/basictypes.h"
+#include "base/eintr_wrapper.h"
+#include "base/file_path.h"
+#include "base/file_util.h"
+#include "base/message_loop.h"
+#include "base/scoped_ptr.h"
+#include "base/test/multiprocess_test.h"
+#include "base/test/test_timeouts.h"
+#include "testing/multiprocess_func_list.h"
+
+namespace {
+
+enum {
+  QUIT_MESSAGE = 47
+};
+
+class IPCChannelPosixTestListener : public IPC::Channel::Listener {
+ public:
+  enum STATUS {
+    DISCONNECTED,
+    MESSAGE_RECEIVED,
+    CHANNEL_ERROR,
+    CONNECTED,
+    DENIED,
+    LISTEN_ERROR
+  };
+
+  IPCChannelPosixTestListener(bool quit_only_on_message)
+      : status_(DISCONNECTED), quit_only_on_message_(quit_only_on_message) {}
+
+  virtual ~IPCChannelPosixTestListener() {}
+
+  virtual void OnMessageReceived(const IPC::Message& message) {
+    EXPECT_EQ(message.type(), QUIT_MESSAGE);
+    status_ = MESSAGE_RECEIVED;
+    QuitRunLoop();
+  }
+
+  virtual void OnChannelConnected(int32 peer_pid) {
+    status_ = CONNECTED;
+    if (!quit_only_on_message_) {
+      QuitRunLoop();
+    }
+  }
+
+  virtual void OnChannelError()  {
+    status_ = CHANNEL_ERROR;
+    if (!quit_only_on_message_) {
+      QuitRunLoop();
+    }
+  }
+
+  virtual void OnChannelDenied() {
+    status_ = DENIED;
+    if (!quit_only_on_message_) {
+      QuitRunLoop();
+    }
+  }
+
+  virtual void OnChannelListenError() {
+    status_ = LISTEN_ERROR;
+    if (!quit_only_on_message_) {
+      QuitRunLoop();
+    }
+  }
+
+  STATUS status() { return status_; }
+
+  void QuitRunLoop() {
+    MessageLoopForIO::current()->QuitNow();
+  }
+
+ private:
+  // The current status of the listener.
+  STATUS status_;
+  // If |quit_only_on_message_| then the listener will only break out of
+  // the run loop when the QUIT_MESSAGE is received.
+  bool quit_only_on_message_;
+};
+
+}  // namespace
+
+class IPCChannelPosixTest : public base::MultiProcessTest {
+ public:
+  static const char kConnectionSocketTestName[];
+  static void SetUpSocket(IPC::ChannelHandle *handle,
+                          IPC::Channel::Mode mode);
+  static void SpinRunLoop(int milliseconds);
+
+ protected:
+  virtual void SetUp();
+  virtual void TearDown();
+
+private:
+  scoped_ptr<MessageLoopForIO> message_loop_;
+};
+
+const char IPCChannelPosixTest::kConnectionSocketTestName[] =
+    "/var/tmp/chrome_IPCChannelPosixTest__ConnectionSocket";
+
+void IPCChannelPosixTest::SetUp() {
+  MultiProcessTest::SetUp();
+  // Construct a fresh IO Message loop for the duration of each test.
+  message_loop_.reset(new MessageLoopForIO());
+}
+
+void IPCChannelPosixTest::TearDown() {
+  message_loop_.reset(NULL);
+  MultiProcessTest::TearDown();
+}
+
+// Create up a socket and bind and listen to it, or connect it
+// depending on the |mode|.
+void IPCChannelPosixTest::SetUpSocket(IPC::ChannelHandle *handle,
+                                      IPC::Channel::Mode mode) {
+  const std::string& name = handle->name;
+
+  int socket_fd = socket(PF_UNIX, SOCK_STREAM, 0);
+  ASSERT_GE(socket_fd, 0) << name;
+  ASSERT_GE(fcntl(socket_fd, F_SETFL, O_NONBLOCK), 0);
+  struct sockaddr_un server_address = { 0 };
+  memset(&server_address, 0, sizeof(server_address));
+  server_address.sun_family = AF_UNIX;
+  int path_len = snprintf(server_address.sun_path, IPC::kMaxPipeNameLength,
+                          "%s", name.c_str());
+  DCHECK_EQ(static_cast<int>(name.length()), path_len);
+  size_t server_address_len = offsetof(struct sockaddr_un,
+                                       sun_path) + path_len + 1;
+
+  if (mode == IPC::Channel::MODE_NAMED_SERVER) {
+    // Only one server at a time. Cleanup garbage if it exists.
+    unlink(name.c_str());
+      // Make sure the path we need exists.
+    FilePath path(name);
+    FilePath dir_path = path.DirName();
+    ASSERT_TRUE(file_util::CreateDirectory(dir_path));
+    ASSERT_GE(bind(socket_fd,
+                   reinterpret_cast<struct sockaddr *>(&server_address),
+                   server_address_len), 0) << server_address.sun_path
+                                           << ": " << strerror(errno)
+                                           << "(" << errno << ")";
+    ASSERT_GE(listen(socket_fd, SOMAXCONN), 0) << server_address.sun_path
+                                               << ": " << strerror(errno)
+                                               << "(" << errno << ")";
+  } else if (mode == IPC::Channel::MODE_NAMED_CLIENT) {
+    ASSERT_GE(connect(socket_fd,
+                      reinterpret_cast<struct sockaddr *>(&server_address),
+                      server_address_len), 0) << server_address.sun_path
+                                              << ": " << strerror(errno)
+                                              << "(" << errno << ")";
+  } else {
+    FAIL() << "Unknown mode " << mode;
+  }
+  handle->socket.fd = socket_fd;
+}
+
+void IPCChannelPosixTest::SpinRunLoop(int milliseconds) {
+  MessageLoopForIO *loop = MessageLoopForIO::current();
+  // Post a quit task so that this loop eventually ends and we don't hang
+  // in the case of a bad test. Usually, the run loop will quit sooner than
+  // that because all tests use a IPCChannelPosixTestListener which quits the
+  // current run loop on any channel activity.
+  loop->PostDelayedTask(FROM_HERE, new MessageLoop::QuitTask(), milliseconds);
+  loop->Run();
+}
+
+TEST_F(IPCChannelPosixTest, BasicListen) {
+  // Test creating a socket that is listening.
+  IPC::ChannelHandle handle("/var/tmp/IPCChannelPosixTest_BasicListen");
+  SetUpSocket(&handle, IPC::Channel::MODE_NAMED_SERVER);
+  unlink(handle.name.c_str());
+  IPC::Channel channel(handle, IPC::Channel::MODE_NAMED_SERVER, NULL);
+  ASSERT_TRUE(channel.Connect());
+  ASSERT_TRUE(channel.AcceptsConnections());
+  ASSERT_FALSE(channel.HasAcceptedConnection());
+  channel.ResetToAcceptingConnectionState();
+  ASSERT_FALSE(channel.HasAcceptedConnection());
+}
+
+TEST_F(IPCChannelPosixTest, BasicConnected) {
+  // Test creating a socket that is connected.
+  int pipe_fds[2];
+  ASSERT_EQ(0, socketpair(AF_UNIX, SOCK_STREAM, 0, pipe_fds));
+  std::string socket_name("/var/tmp/IPCChannelPosixTest_BasicConnected");
+  ASSERT_GE(fcntl(pipe_fds[0], F_SETFL, O_NONBLOCK), 0);
+
+  base::FileDescriptor fd(pipe_fds[0], false);
+  IPC::ChannelHandle handle(socket_name, fd);
+  IPC::Channel channel(handle, IPC::Channel::MODE_SERVER, NULL);
+  ASSERT_TRUE(channel.Connect());
+  ASSERT_FALSE(channel.AcceptsConnections());
+  channel.Close();
+  ASSERT_TRUE(HANDLE_EINTR(close(pipe_fds[1])) == 0);
+
+  // Make sure that we can use the socket that is created for us by
+  // a standard channel.
+  IPC::Channel channel2(socket_name, IPC::Channel::MODE_SERVER, NULL);
+  ASSERT_TRUE(channel2.Connect());
+  ASSERT_FALSE(channel2.AcceptsConnections());
+}
+
+TEST_F(IPCChannelPosixTest, AdvancedConnected) {
+  // Test creating a connection to an external process.
+  IPCChannelPosixTestListener listener(false);
+  IPC::ChannelHandle chan_handle(kConnectionSocketTestName);
+  SetUpSocket(&chan_handle, IPC::Channel::MODE_NAMED_SERVER);
+  IPC::Channel channel(chan_handle, IPC::Channel::MODE_NAMED_SERVER, &listener);
+  ASSERT_TRUE(channel.Connect());
+  ASSERT_TRUE(channel.AcceptsConnections());
+  ASSERT_FALSE(channel.HasAcceptedConnection());
+
+  base::ProcessHandle handle = SpawnChild("IPCChannelPosixTestConnectionProc",
+                                          false);
+  ASSERT_TRUE(handle);
+  SpinRunLoop(TestTimeouts::action_max_timeout_ms());
+  ASSERT_EQ(IPCChannelPosixTestListener::CONNECTED, listener.status());
+  ASSERT_TRUE(channel.HasAcceptedConnection());
+  IPC::Message* message = new IPC::Message(0, // routing_id
+                                           QUIT_MESSAGE, // message type
+                                           IPC::Message::PRIORITY_NORMAL);
+  channel.Send(message);
+  SpinRunLoop(TestTimeouts::action_timeout_ms());
+  int exit_code = 0;
+  EXPECT_TRUE(base::WaitForExitCode(handle, &exit_code));
+  EXPECT_EQ(0, exit_code);
+  ASSERT_EQ(IPCChannelPosixTestListener::CHANNEL_ERROR, listener.status());
+  ASSERT_FALSE(channel.HasAcceptedConnection());
+}
+
+TEST_F(IPCChannelPosixTest, ResetState) {
+  // Test creating a connection to an external process. Close the connection,
+  // but continue to listen and make sure another external process can connect
+  // to us.
+  IPCChannelPosixTestListener listener(false);
+  IPC::ChannelHandle chan_handle(kConnectionSocketTestName);
+  SetUpSocket(&chan_handle, IPC::Channel::MODE_NAMED_SERVER);
+  IPC::Channel channel(chan_handle, IPC::Channel::MODE_NAMED_SERVER, &listener);
+  ASSERT_TRUE(channel.Connect());
+  ASSERT_TRUE(channel.AcceptsConnections());
+  ASSERT_FALSE(channel.HasAcceptedConnection());
+
+  base::ProcessHandle handle = SpawnChild("IPCChannelPosixTestConnectionProc",
+                                          false);
+  ASSERT_TRUE(handle);
+  SpinRunLoop(TestTimeouts::action_max_timeout_ms());
+  ASSERT_EQ(IPCChannelPosixTestListener::CONNECTED, listener.status());
+  ASSERT_TRUE(channel.HasAcceptedConnection());
+  channel.ResetToAcceptingConnectionState();
+  ASSERT_FALSE(channel.HasAcceptedConnection());
+
+  base::ProcessHandle handle2 = SpawnChild("IPCChannelPosixTestConnectionProc",
+                                          false);
+  ASSERT_TRUE(handle2);
+  SpinRunLoop(TestTimeouts::action_max_timeout_ms());
+  ASSERT_EQ(IPCChannelPosixTestListener::CONNECTED, listener.status());
+  ASSERT_TRUE(channel.HasAcceptedConnection());
+  IPC::Message* message = new IPC::Message(0, // routing_id
+                                           QUIT_MESSAGE, // message type
+                                           IPC::Message::PRIORITY_NORMAL);
+  channel.Send(message);
+  SpinRunLoop(TestTimeouts::action_timeout_ms());
+  EXPECT_TRUE(base::KillProcess(handle, 0, false));
+  int exit_code = 0;
+  EXPECT_TRUE(base::WaitForExitCode(handle2, &exit_code));
+  EXPECT_EQ(0, exit_code);
+  ASSERT_EQ(IPCChannelPosixTestListener::CHANNEL_ERROR, listener.status());
+  ASSERT_FALSE(channel.HasAcceptedConnection());
+}
+
+TEST_F(IPCChannelPosixTest, MultiConnection) {
+  // Test setting up a connection to an external process, and then have
+  // another external process attempt to connect to us.
+  IPCChannelPosixTestListener listener(false);
+  IPC::ChannelHandle chan_handle(kConnectionSocketTestName);
+  SetUpSocket(&chan_handle, IPC::Channel::MODE_NAMED_SERVER);
+  IPC::Channel channel(chan_handle, IPC::Channel::MODE_NAMED_SERVER, &listener);
+  ASSERT_TRUE(channel.Connect());
+  ASSERT_TRUE(channel.AcceptsConnections());
+  ASSERT_FALSE(channel.HasAcceptedConnection());
+
+  base::ProcessHandle handle = SpawnChild("IPCChannelPosixTestConnectionProc",
+                                          false);
+  ASSERT_TRUE(handle);
+  SpinRunLoop(TestTimeouts::action_max_timeout_ms());
+  ASSERT_EQ(IPCChannelPosixTestListener::CONNECTED, listener.status());
+  ASSERT_TRUE(channel.HasAcceptedConnection());
+  base::ProcessHandle handle2 = SpawnChild("IPCChannelPosixFailConnectionProc",
+                                           false);
+  ASSERT_TRUE(handle2);
+  SpinRunLoop(TestTimeouts::action_max_timeout_ms());
+  int exit_code = 0;
+  EXPECT_TRUE(base::WaitForExitCode(handle2, &exit_code));
+  EXPECT_EQ(exit_code, 0);
+  ASSERT_EQ(IPCChannelPosixTestListener::DENIED, listener.status());
+  ASSERT_TRUE(channel.HasAcceptedConnection());
+  IPC::Message* message = new IPC::Message(0, // routing_id
+                                           QUIT_MESSAGE, // message type
+                                           IPC::Message::PRIORITY_NORMAL);
+  channel.Send(message);
+  SpinRunLoop(TestTimeouts::action_timeout_ms());
+  EXPECT_TRUE(base::WaitForExitCode(handle, &exit_code));
+  EXPECT_EQ(exit_code, 0);
+  ASSERT_EQ(IPCChannelPosixTestListener::CHANNEL_ERROR, listener.status());
+  ASSERT_FALSE(channel.HasAcceptedConnection());
+}
+
+// A long running process that connects to us
+MULTIPROCESS_TEST_MAIN(IPCChannelPosixTestConnectionProc) {
+  MessageLoopForIO message_loop;
+  IPCChannelPosixTestListener listener(true);
+  IPC::ChannelHandle handle(IPCChannelPosixTest::kConnectionSocketTestName);
+  IPCChannelPosixTest::SetUpSocket(&handle, IPC::Channel::MODE_NAMED_CLIENT);
+  IPC::Channel channel(handle, IPC::Channel::MODE_NAMED_CLIENT, &listener);
+  EXPECT_TRUE(channel.Connect());
+  IPCChannelPosixTest::SpinRunLoop(TestTimeouts::action_max_timeout_ms());
+  EXPECT_EQ(IPCChannelPosixTestListener::MESSAGE_RECEIVED, listener.status());
+  return 0;
+}
+
+// Simple external process that shouldn't be able to connect to us.
+MULTIPROCESS_TEST_MAIN(IPCChannelPosixFailConnectionProc) {
+  MessageLoopForIO message_loop;
+  IPCChannelPosixTestListener listener(false);
+  IPC::ChannelHandle handle(IPCChannelPosixTest::kConnectionSocketTestName);
+  IPCChannelPosixTest::SetUpSocket(&handle, IPC::Channel::MODE_NAMED_CLIENT);
+  IPC::Channel channel(handle, IPC::Channel::MODE_NAMED_CLIENT, &listener);
+
+  // In this case connect may succeed or fail depending on if the packet
+  // actually gets sent at sendmsg. Since we never delay on send, we may not
+  // see the error. However even if connect succeeds, eventually we will get an
+  // error back since the channel will be closed when we attempt to read from
+  // it.
+  bool connected = channel.Connect();
+  if (connected) {
+    IPCChannelPosixTest::SpinRunLoop(TestTimeouts::action_max_timeout_ms());
+    EXPECT_EQ(IPCChannelPosixTestListener::CHANNEL_ERROR, listener.status());
+  } else {
+    EXPECT_EQ(IPCChannelPosixTestListener::DISCONNECTED, listener.status());
+  }
+  return 0;
+}
+