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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "build/build_config.h"
#if BUILDFLAG(IS_MAC)
extern "C" {
#include <sandbox.h>
}
#endif
#include <fcntl.h>
#include <stddef.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <unistd.h>
#include <memory>
#include <queue>
#include "base/file_descriptor_posix.h"
#include "base/pickle.h"
#include "base/posix/eintr_wrapper.h"
#include "base/run_loop.h"
#include "base/synchronization/waitable_event.h"
#include "base/task/single_thread_task_runner.h"
#include "base/threading/thread.h"
#include "base/threading/thread_task_runner_handle.h"
#include "ipc/ipc_message_attachment_set.h"
#include "ipc/ipc_message_utils.h"
#include "ipc/ipc_test_base.h"
#if BUILDFLAG(IS_MAC)
#include "sandbox/mac/seatbelt.h"
#elif BUILDFLAG(IS_FUCHSIA)
#include "base/memory/scoped_refptr.h"
#include "base/test/scoped_dev_zero_fuchsia.h"
#endif
namespace {
const unsigned kNumFDsToSend = 7; // per message
const unsigned kNumMessages = 20;
const char* kDevZeroPath = "/dev/zero";
static_assert(kNumFDsToSend ==
IPC::MessageAttachmentSet::kMaxDescriptorsPerMessage,
"The number of FDs to send must be kMaxDescriptorsPerMessage.");
class MyChannelDescriptorListenerBase : public IPC::Listener {
public:
bool OnMessageReceived(const IPC::Message& message) override {
base::PickleIterator iter(message);
base::FileDescriptor descriptor;
while (IPC::ParamTraits<base::FileDescriptor>::Read(
&message, &iter, &descriptor)) {
HandleFD(descriptor.fd);
}
return true;
}
protected:
virtual void HandleFD(int fd) = 0;
};
class MyChannelDescriptorListener : public MyChannelDescriptorListenerBase {
public:
explicit MyChannelDescriptorListener(ino_t expected_inode_num)
: MyChannelDescriptorListenerBase(),
expected_inode_num_(expected_inode_num),
num_fds_received_(0) {
}
unsigned num_fds_received() const {
return num_fds_received_;
}
void OnChannelError() override {
base::RunLoop::QuitCurrentWhenIdleDeprecated();
}
protected:
void HandleFD(int fd) override {
ASSERT_GE(fd, 0);
// Check that we can read from the FD.
char buf;
ssize_t amt_read = read(fd, &buf, 1);
ASSERT_EQ(amt_read, 1);
ASSERT_EQ(buf, 0); // /dev/zero always reads 0 bytes.
struct stat st;
ASSERT_EQ(fstat(fd, &st), 0);
ASSERT_EQ(close(fd), 0);
// Compare inode numbers to check that the file sent over the wire is
// actually the one expected.
ASSERT_EQ(expected_inode_num_, st.st_ino);
++num_fds_received_;
if (num_fds_received_ == kNumFDsToSend * kNumMessages)
base::RunLoop::QuitCurrentWhenIdleDeprecated();
}
private:
ino_t expected_inode_num_;
unsigned num_fds_received_;
};
class IPCSendFdsTest : public IPCChannelMojoTestBase {
protected:
void SetUp() override {
#if BUILDFLAG(IS_FUCHSIA)
ASSERT_TRUE(dev_zero_);
#endif
}
void RunServer() {
// Set up IPC channel and start client.
MyChannelDescriptorListener listener(-1);
CreateChannel(&listener);
ASSERT_TRUE(ConnectChannel());
for (unsigned i = 0; i < kNumMessages; ++i) {
IPC::Message* message =
new IPC::Message(0, 3, IPC::Message::PRIORITY_NORMAL);
for (unsigned j = 0; j < kNumFDsToSend; ++j) {
const int fd = open(kDevZeroPath, O_RDONLY);
ASSERT_GE(fd, 0);
base::FileDescriptor descriptor(fd, true);
IPC::ParamTraits<base::FileDescriptor>::Write(message, descriptor);
}
ASSERT_TRUE(sender()->Send(message));
}
// Run message loop.
base::RunLoop().Run();
// Close the channel so the client's OnChannelError() gets fired.
channel()->Close();
EXPECT_TRUE(WaitForClientShutdown());
DestroyChannel();
}
private:
#if BUILDFLAG(IS_FUCHSIA)
scoped_refptr<base::ScopedDevZero> dev_zero_ = base::ScopedDevZero::Get();
#endif
};
// Disabled on Fuchsia due to failures; see https://crbug.com/1272424.
#if BUILDFLAG(IS_FUCHSIA)
#define MAYBE_DescriptorTest DISABLED_DescriptorTest
#else
#define MAYBE_DescriptorTest DescriptorTest
#endif
TEST_F(IPCSendFdsTest, MAYBE_DescriptorTest) {
Init("SendFdsClient");
RunServer();
}
class SendFdsTestClientFixture : public IpcChannelMojoTestClient {
protected:
void SendFdsClientCommon(const std::string& test_client_name,
ino_t expected_inode_num) {
MyChannelDescriptorListener listener(expected_inode_num);
// Set up IPC channel.
Connect(&listener);
// Run message loop.
base::RunLoop().Run();
// Verify that the message loop was exited due to getting the correct number
// of descriptors, and not because of the channel closing unexpectedly.
EXPECT_EQ(kNumFDsToSend * kNumMessages, listener.num_fds_received());
Close();
}
};
DEFINE_IPC_CHANNEL_MOJO_TEST_CLIENT_WITH_CUSTOM_FIXTURE(
SendFdsClient,
SendFdsTestClientFixture) {
struct stat st;
int fd = open(kDevZeroPath, O_RDONLY);
fstat(fd, &st);
EXPECT_GE(IGNORE_EINTR(close(fd)), 0);
SendFdsClientCommon("SendFdsClient", st.st_ino);
}
#if BUILDFLAG(IS_MAC)
// Test that FDs are correctly sent to a sandboxed process.
// TODO(port): Make this test cross-platform.
TEST_F(IPCSendFdsTest, DescriptorTestSandboxed) {
Init("SendFdsSandboxedClient");
RunServer();
}
DEFINE_IPC_CHANNEL_MOJO_TEST_CLIENT_WITH_CUSTOM_FIXTURE(
SendFdsSandboxedClient,
SendFdsTestClientFixture) {
struct stat st;
const int fd = open(kDevZeroPath, O_RDONLY);
fstat(fd, &st);
ASSERT_LE(0, IGNORE_EINTR(close(fd)));
// Enable the sandbox.
char* error_buff = NULL;
int error = sandbox::Seatbelt::Init(
sandbox::Seatbelt::kProfilePureComputation, SANDBOX_NAMED, &error_buff);
ASSERT_EQ(0, error);
ASSERT_FALSE(error_buff);
sandbox::Seatbelt::FreeError(error_buff);
// Make sure sandbox is really enabled.
ASSERT_EQ(-1, open(kDevZeroPath, O_RDONLY))
<< "Sandbox wasn't properly enabled";
// See if we can receive a file descriptor.
SendFdsClientCommon("SendFdsSandboxedClient", st.st_ino);
}
#endif // BUILDFLAG(IS_MAC)
} // namespace
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