1 /*
2 * Copyright (C) 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <sys/un.h>
18 #include <unistd.h>
19
20 #include <android-base/file.h>
21 #include <android-base/stringprintf.h>
22 #include <android-base/unique_fd.h>
23 #include <gtest/gtest.h>
24
25 using android::base::StringPrintf;
26 using android::base::unique_fd;
27
28 // logd_writer takes advantage of the fact that connect() can be called multiple times for a DGRAM
29 // socket. This tests for that behavior.
TEST(liblog,multi_connect_dgram_socket)30 TEST(liblog, multi_connect_dgram_socket) {
31 #ifdef __ANDROID__
32 if (getuid() != 0) {
33 GTEST_SKIP() << "Skipping test, must be run as root.";
34 return;
35 }
36 auto temp_dir = TemporaryDir();
37 auto socket_path = StringPrintf("%s/test_socket", temp_dir.path);
38
39 unique_fd server_socket;
40
41 auto open_server_socket = [&] {
42 server_socket.reset(TEMP_FAILURE_RETRY(socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0)));
43 ASSERT_TRUE(server_socket.ok());
44
45 sockaddr_un server_sockaddr = {};
46 server_sockaddr.sun_family = AF_UNIX;
47 strlcpy(server_sockaddr.sun_path, socket_path.c_str(), sizeof(server_sockaddr.sun_path));
48 ASSERT_EQ(0,
49 TEMP_FAILURE_RETRY(bind(server_socket, reinterpret_cast<sockaddr*>(&server_sockaddr),
50 sizeof(server_sockaddr))));
51 };
52
53 // Open the server socket.
54 open_server_socket();
55
56 // Open the client socket.
57 auto client_socket =
58 unique_fd{TEMP_FAILURE_RETRY(socket(AF_UNIX, SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0))};
59 ASSERT_TRUE(client_socket.ok());
60 sockaddr_un client_sockaddr = {};
61 client_sockaddr.sun_family = AF_UNIX;
62 strlcpy(client_sockaddr.sun_path, socket_path.c_str(), sizeof(client_sockaddr.sun_path));
63 ASSERT_EQ(0,
64 TEMP_FAILURE_RETRY(connect(client_socket, reinterpret_cast<sockaddr*>(&client_sockaddr),
65 sizeof(client_sockaddr))));
66
67 // Ensure that communication works.
68 constexpr static char kSmoke[] = "smoke test";
69 ssize_t smoke_len = sizeof(kSmoke);
70 ASSERT_EQ(smoke_len, TEMP_FAILURE_RETRY(write(client_socket, kSmoke, sizeof(kSmoke))));
71 char read_buf[512];
72 ASSERT_EQ(smoke_len, TEMP_FAILURE_RETRY(read(server_socket, read_buf, sizeof(read_buf))));
73 ASSERT_STREQ(kSmoke, read_buf);
74
75 // Close the server socket.
76 server_socket.reset();
77 ASSERT_EQ(0, unlink(socket_path.c_str())) << strerror(errno);
78
79 // Ensure that write() from the client returns an error since the server is closed.
80 ASSERT_EQ(-1, TEMP_FAILURE_RETRY(write(client_socket, kSmoke, sizeof(kSmoke))));
81 ASSERT_EQ(errno, ECONNREFUSED) << strerror(errno);
82
83 // Open the server socket again.
84 open_server_socket();
85
86 // Reconnect the same client socket.
87 ASSERT_EQ(0,
88 TEMP_FAILURE_RETRY(connect(client_socket, reinterpret_cast<sockaddr*>(&client_sockaddr),
89 sizeof(client_sockaddr))))
90 << strerror(errno);
91
92 // Ensure that communication works.
93 ASSERT_EQ(smoke_len, TEMP_FAILURE_RETRY(write(client_socket, kSmoke, sizeof(kSmoke))));
94 ASSERT_EQ(smoke_len, TEMP_FAILURE_RETRY(read(server_socket, read_buf, sizeof(read_buf))));
95 ASSERT_STREQ(kSmoke, read_buf);
96 #else
97 GTEST_LOG_(INFO) << "This test does nothing.\n";
98 #endif
99 }