ipc/ipc_send_fds_test.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "build/build_config.h"
   6
   7 #if defined(OS_POSIX)
   8 #if defined(OS_MACOSX)
   9 extern "C" {
  10 #include <sandbox.h>
  11 }
  12 #endif
  13 #include <fcntl.h>
  14 #include <sys/stat.h>
  15 #include <unistd.h>
  16
  17 #include "base/file_descriptor_posix.h"
  18 #include "base/message_loop.h"
  19 #include "base/pickle.h"
  20 #include "base/posix/eintr_wrapper.h"
  21 #include "ipc/ipc_message_utils.h"
  22 #include "ipc/ipc_test_base.h"
  23
  24 namespace {
  25
  26 const unsigned kNumFDsToSend = 20;
  27 const char* kDevZeroPath = "/dev/zero";
  28
  29 static void VerifyAndCloseDescriptor(int fd, ino_t inode_num) {
  30   // Check that we can read from the FD.
  31   char buf;
  32   ssize_t amt_read = read(fd, &buf, 1);
  33   ASSERT_EQ(amt_read, 1);
  34   ASSERT_EQ(buf, 0);  // /dev/zero always reads 0 bytes.
  35
  36   struct stat st;
  37   ASSERT_EQ(fstat(fd, &st), 0);
  38
  39   ASSERT_EQ(close(fd), 0);
  40
  41   // Compare inode numbers to check that the file sent over the wire is actually
  42   // the one expected.
  43   ASSERT_EQ(inode_num, st.st_ino);
  44 }
  45
  46 class MyChannelDescriptorListener : public IPC::Listener {
  47  public:
  48   explicit MyChannelDescriptorListener(ino_t expected_inode_num)
  49       : expected_inode_num_(expected_inode_num),
  50         num_fds_received_(0) {}
  51
  52   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
  53     PickleIterator iter(message);
  54
  55     ++num_fds_received_;
  56     base::FileDescriptor descriptor;
  57
  58     IPC::ParamTraits<base::FileDescriptor>::Read(&message, &iter, &descriptor);
  59
  60     VerifyAndCloseDescriptor(descriptor.fd, expected_inode_num_);
  61     if (num_fds_received_ == kNumFDsToSend)
  62       MessageLoop::current()->Quit();
  63
  64     return true;
  65   }
  66
  67   virtual void OnChannelError() OVERRIDE {
  68     MessageLoop::current()->Quit();
  69   }
  70
  71   bool GotExpectedNumberOfDescriptors() const {
  72     return num_fds_received_ == kNumFDsToSend;
  73   }
  74
  75  private:
  76   ino_t expected_inode_num_;
  77   unsigned num_fds_received_;
  78 };
  79
  80 class IPCSendFdsTest : public IPCTestBase {
  81  protected:
  82   void RunServer() {
  83     // Set up IPC channel and start client.
  84     MyChannelDescriptorListener listener(-1);
  85     CreateChannel(&listener);
  86     ASSERT_TRUE(ConnectChannel());
  87     ASSERT_TRUE(StartClient());
  88
  89     for (unsigned i = 0; i < kNumFDsToSend; ++i) {
  90       const int fd = open(kDevZeroPath, O_RDONLY);
  91       ASSERT_GE(fd, 0);
  92       base::FileDescriptor descriptor(fd, true);
  93
  94       IPC::Message* message =
  95           new IPC::Message(0, 3, IPC::Message::PRIORITY_NORMAL);
  96       IPC::ParamTraits<base::FileDescriptor>::Write(message, descriptor);
  97       ASSERT_TRUE(sender()->Send(message));
  98     }
  99
 100     // Run message loop.
 101     MessageLoop::current()->Run();
 102
 103     // Close the channel so the client's OnChannelError() gets fired.
 104     channel()->Close();
 105
 106     EXPECT_TRUE(WaitForClientShutdown());
 107     DestroyChannel();
 108   }
 109 };
 110
 111 TEST_F(IPCSendFdsTest, DescriptorTest) {
 112   Init("SendFdsClient");
 113   RunServer();
 114 }
 115
 116 int SendFdsClientCommon(const std::string& test_client_name,
 117                         ino_t expected_inode_num) {
 118   MessageLoopForIO main_message_loop;
 119   MyChannelDescriptorListener listener(expected_inode_num);
 120
 121   // Set up IPC channel.
 122   IPC::Channel channel(IPCTestBase::GetChannelName(test_client_name),
 123                        IPC::Channel::MODE_CLIENT,
 124                        &listener);
 125   CHECK(channel.Connect());
 126
 127   // Run message loop.
 128   MessageLoop::current()->Run();
 129
 130   // Verify that the message loop was exited due to getting the correct number
 131   // of descriptors, and not because of the channel closing unexpectedly.
 132   CHECK(listener.GotExpectedNumberOfDescriptors());
 133
 134   return 0;
 135 }
 136
 137 MULTIPROCESS_IPC_TEST_CLIENT_MAIN(SendFdsClient) {
 138   struct stat st;
 139   int fd = open(kDevZeroPath, O_RDONLY);
 140   fstat(fd, &st);
 141   EXPECT_GE(HANDLE_EINTR(close(fd)), 0);
 142   return SendFdsClientCommon("SendFdsClient", st.st_ino);
 143 }
 144
 145 #if defined(OS_MACOSX)
 146 // Test that FDs are correctly sent to a sandboxed process.
 147 // TODO(port): Make this test cross-platform.
 148 TEST_F(IPCSendFdsTest, DescriptorTestSandboxed) {
 149   Init("SendFdsSandboxedClient");
 150   RunServer();
 151 }
 152
 153 MULTIPROCESS_IPC_TEST_CLIENT_MAIN(SendFdsSandboxedClient) {
 154   struct stat st;
 155   const int fd = open(kDevZeroPath, O_RDONLY);
 156   fstat(fd, &st);
 157   if (HANDLE_EINTR(close(fd)) < 0)
 158     return -1;
 159
 160   // Enable the sandbox.
 161   char* error_buff = NULL;
 162   int error = sandbox_init(kSBXProfilePureComputation, SANDBOX_NAMED,
 163                            &error_buff);
 164   bool success = (error == 0 && error_buff == NULL);
 165   if (!success)
 166     return -1;
 167
 168   sandbox_free_error(error_buff);
 169
 170   // Make sure sandbox is really enabled.
 171   if (open(kDevZeroPath, O_RDONLY) != -1) {
 172     LOG(ERROR) << "Sandbox wasn't properly enabled";
 173     return -1;
 174   }
 175
 176   // See if we can receive a file descriptor.
 177   return SendFdsClientCommon("SendFdsSandboxedClient", st.st_ino);
 178 }
 179 #endif  // defined(OS_MACOSX)
 180
 181 }  // namespace
 182
 183 #endif  // defined(OS_POSIX)