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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "base/posix/unix_domain_socket.h"
#include <stddef.h>
#include <stdint.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/location.h"
#include "base/pickle.h"
#include "base/synchronization/waitable_event.h"
#include "base/task/single_thread_task_runner.h"
#include "base/threading/thread.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
// Callers should use ASSERT_NO_FATAL_FAILURE with this function, to
// ensure that execution is aborted if the function has assertion failure.
void CreateSocketPair(int fds[2]) {
#if BUILDFLAG(IS_APPLE)
// Mac OS does not support SOCK_SEQPACKET.
int flags = SOCK_STREAM;
#else
int flags = SOCK_SEQPACKET;
#endif
ASSERT_EQ(0, socketpair(AF_UNIX, flags, 0, fds));
}
TEST(UnixDomainSocketTest, SendRecvMsgAbortOnReplyFDClose) {
Thread message_thread("UnixDomainSocketTest");
ASSERT_TRUE(message_thread.Start());
int fds[2];
ASSERT_NO_FATAL_FAILURE(CreateSocketPair(fds));
ScopedFD scoped_fd0(fds[0]);
ScopedFD scoped_fd1(fds[1]);
// Have the thread send a synchronous message via the socket.
Pickle request;
message_thread.task_runner()->PostTask(
FROM_HERE, BindOnce(IgnoreResult(&UnixDomainSocket::SendRecvMsg), fds[1],
nullptr, 0U, nullptr, request));
// Receive the message.
std::vector<ScopedFD> message_fds;
uint8_t buffer[16];
ASSERT_EQ(
static_cast<int>(request.size()),
UnixDomainSocket::RecvMsg(fds[0], buffer, sizeof(buffer), &message_fds));
ASSERT_EQ(1U, message_fds.size());
// Close the reply FD.
message_fds.clear();
// Check that the thread didn't get blocked.
WaitableEvent event(WaitableEvent::ResetPolicy::AUTOMATIC,
WaitableEvent::InitialState::NOT_SIGNALED);
message_thread.task_runner()->PostTask(
FROM_HERE, BindOnce(&WaitableEvent::Signal, Unretained(&event)));
ASSERT_TRUE(event.TimedWait(Milliseconds(5000)));
}
TEST(UnixDomainSocketTest, SendRecvMsgAvoidsSIGPIPE) {
// Make sure SIGPIPE isn't being ignored.
struct sigaction act = {}, oldact;
act.sa_handler = SIG_DFL;
ASSERT_EQ(0, sigaction(SIGPIPE, &act, &oldact));
int fds[2];
ASSERT_NO_FATAL_FAILURE(CreateSocketPair(fds));
ScopedFD scoped_fd1(fds[1]);
ASSERT_EQ(0, IGNORE_EINTR(close(fds[0])));
// Have the thread send a synchronous message via the socket. Unless the
// message is sent with MSG_NOSIGNAL, this shall result in SIGPIPE.
Pickle request;
ASSERT_EQ(
-1, UnixDomainSocket::SendRecvMsg(fds[1], nullptr, 0U, nullptr, request));
ASSERT_EQ(EPIPE, errno);
// Restore the SIGPIPE handler.
ASSERT_EQ(0, sigaction(SIGPIPE, &oldact, nullptr));
}
// Simple sanity check within a single process that receiving PIDs works.
TEST(UnixDomainSocketTest, RecvPid) {
int fds[2];
ASSERT_NO_FATAL_FAILURE(CreateSocketPair(fds));
ScopedFD recv_sock(fds[0]);
ScopedFD send_sock(fds[1]);
ASSERT_TRUE(UnixDomainSocket::EnableReceiveProcessId(recv_sock.get()));
static const char kHello[] = "hello";
ASSERT_TRUE(UnixDomainSocket::SendMsg(send_sock.get(), kHello, sizeof(kHello),
std::vector<int>()));
// Extra receiving buffer space to make sure we really received only
// sizeof(kHello) bytes and it wasn't just truncated to fit the buffer.
char buf[sizeof(kHello) + 1];
ProcessId sender_pid;
std::vector<ScopedFD> fd_vec;
const ssize_t nread = UnixDomainSocket::RecvMsgWithPid(
recv_sock.get(), buf, sizeof(buf), &fd_vec, &sender_pid);
ASSERT_EQ(sizeof(kHello), static_cast<size_t>(nread));
ASSERT_EQ(0, memcmp(buf, kHello, sizeof(kHello)));
ASSERT_EQ(0U, fd_vec.size());
ASSERT_EQ(getpid(), sender_pid);
}
// Same as above, but send the max number of file descriptors too.
TEST(UnixDomainSocketTest, RecvPidWithMaxDescriptors) {
int fds[2];
ASSERT_NO_FATAL_FAILURE(CreateSocketPair(fds));
ScopedFD recv_sock(fds[0]);
ScopedFD send_sock(fds[1]);
ASSERT_TRUE(UnixDomainSocket::EnableReceiveProcessId(recv_sock.get()));
static const char kHello[] = "hello";
std::vector<int> send_fds(UnixDomainSocket::kMaxFileDescriptors,
send_sock.get());
ASSERT_TRUE(UnixDomainSocket::SendMsg(send_sock.get(), kHello, sizeof(kHello),
send_fds));
// Extra receiving buffer space to make sure we really received only
// sizeof(kHello) bytes and it wasn't just truncated to fit the buffer.
char buf[sizeof(kHello) + 1];
ProcessId sender_pid;
std::vector<ScopedFD> recv_fds;
const ssize_t nread = UnixDomainSocket::RecvMsgWithPid(
recv_sock.get(), buf, sizeof(buf), &recv_fds, &sender_pid);
ASSERT_EQ(sizeof(kHello), static_cast<size_t>(nread));
ASSERT_EQ(0, memcmp(buf, kHello, sizeof(kHello)));
ASSERT_EQ(UnixDomainSocket::kMaxFileDescriptors, recv_fds.size());
ASSERT_EQ(getpid(), sender_pid);
}
// Check that RecvMsgWithPid doesn't DCHECK fail when reading EOF from a
// disconnected socket.
TEST(UnixDomianSocketTest, RecvPidDisconnectedSocket) {
int fds[2];
ASSERT_NO_FATAL_FAILURE(CreateSocketPair(fds));
ScopedFD recv_sock(fds[0]);
ScopedFD send_sock(fds[1]);
ASSERT_TRUE(UnixDomainSocket::EnableReceiveProcessId(recv_sock.get()));
send_sock.reset();
char ch;
ProcessId sender_pid;
std::vector<ScopedFD> recv_fds;
const ssize_t nread = UnixDomainSocket::RecvMsgWithPid(
recv_sock.get(), &ch, sizeof(ch), &recv_fds, &sender_pid);
ASSERT_EQ(0, nread);
ASSERT_EQ(-1, sender_pid);
ASSERT_EQ(0U, recv_fds.size());
}
} // namespace
} // namespace base
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