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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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 <sys/un.h>
#include <unistd.h>
#include <android-base/file.h>
#include <android-base/stringprintf.h>
#include <android-base/unique_fd.h>
#include <gtest/gtest.h>
using android::base::StringPrintf;
using android::base::unique_fd;
// logd_writer takes advantage of the fact that connect() can be called multiple times for a DGRAM
// socket. This tests for that behavior.
TEST(liblog, multi_connect_dgram_socket) {
#ifdef __ANDROID__
if (getuid() != 0) {
GTEST_SKIP() << "Skipping test, must be run as root.";
return;
}
auto temp_dir = TemporaryDir();
auto socket_path = StringPrintf("%s/test_socket", temp_dir.path);
unique_fd server_socket;
auto open_server_socket = [&] {
server_socket.reset(TEMP_FAILURE_RETRY(socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0)));
ASSERT_TRUE(server_socket.ok());
sockaddr_un server_sockaddr = {};
server_sockaddr.sun_family = AF_UNIX;
strlcpy(server_sockaddr.sun_path, socket_path.c_str(), sizeof(server_sockaddr.sun_path));
ASSERT_EQ(0,
TEMP_FAILURE_RETRY(bind(server_socket, reinterpret_cast<sockaddr*>(&server_sockaddr),
sizeof(server_sockaddr))));
};
// Open the server socket.
open_server_socket();
// Open the client socket.
auto client_socket =
unique_fd{TEMP_FAILURE_RETRY(socket(AF_UNIX, SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0))};
ASSERT_TRUE(client_socket.ok());
sockaddr_un client_sockaddr = {};
client_sockaddr.sun_family = AF_UNIX;
strlcpy(client_sockaddr.sun_path, socket_path.c_str(), sizeof(client_sockaddr.sun_path));
ASSERT_EQ(0,
TEMP_FAILURE_RETRY(connect(client_socket, reinterpret_cast<sockaddr*>(&client_sockaddr),
sizeof(client_sockaddr))));
// Ensure that communication works.
constexpr static char kSmoke[] = "smoke test";
ssize_t smoke_len = sizeof(kSmoke);
ASSERT_EQ(smoke_len, TEMP_FAILURE_RETRY(write(client_socket, kSmoke, sizeof(kSmoke))));
char read_buf[512];
ASSERT_EQ(smoke_len, TEMP_FAILURE_RETRY(read(server_socket, read_buf, sizeof(read_buf))));
ASSERT_STREQ(kSmoke, read_buf);
// Close the server socket.
server_socket.reset();
ASSERT_EQ(0, unlink(socket_path.c_str())) << strerror(errno);
// Ensure that write() from the client returns an error since the server is closed.
ASSERT_EQ(-1, TEMP_FAILURE_RETRY(write(client_socket, kSmoke, sizeof(kSmoke))));
ASSERT_EQ(errno, ECONNREFUSED) << strerror(errno);
// Open the server socket again.
open_server_socket();
// Reconnect the same client socket.
ASSERT_EQ(0,
TEMP_FAILURE_RETRY(connect(client_socket, reinterpret_cast<sockaddr*>(&client_sockaddr),
sizeof(client_sockaddr))))
<< strerror(errno);
// Ensure that communication works.
ASSERT_EQ(smoke_len, TEMP_FAILURE_RETRY(write(client_socket, kSmoke, sizeof(kSmoke))));
ASSERT_EQ(smoke_len, TEMP_FAILURE_RETRY(read(server_socket, read_buf, sizeof(read_buf))));
ASSERT_STREQ(kSmoke, read_buf);
#else
GTEST_LOG_(INFO) << "This test does nothing.\n";
#endif
}
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