1 /*
2  * Copyright (C) 2019 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 "Utils.h"
18 
19 #ifdef __BIONIC__
20 #include <cutils/properties.h>
21 #endif  // __BIONIC__
22 
23 #include <getopt.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <sys/select.h>
27 #include <unistd.h>
28 #include <array>
29 #include <climits>
30 #include <iostream>
31 #include <sstream>
32 
33 using std::cerr;
34 using std::endl;
35 
36 namespace android {
37 namespace hardware {
38 namespace automotive {
39 namespace vehicle {
40 namespace V2_0 {
41 namespace impl {
42 
43 #ifdef __BIONIC__
44 std::string VirtualizedVhalServerInfo::getServerUri() const {
45     return vsock.str();
46 }
47 #else
48 std::string VirtualizedVhalServerInfo::getServerUri() const {
49     std::stringstream ss;
50 
51     ss << "vsock:" << vsock.cid << ":" << vsock.port;
52     return ss.str();
53 }
54 #endif
55 
56 bool WaitForReadWithTimeout(int fd, struct timeval&& timeout) {
57     fd_set read_fd_set;
58     FD_ZERO(&read_fd_set);
59     FD_SET(fd, &read_fd_set);
60     auto ready = select(FD_SETSIZE, &read_fd_set, nullptr, nullptr, &timeout);
61 
62     if (ready < 0) {
63         cerr << __func__ << ": fd: " << fd << ", errno: " << errno << ", " << strerror(errno)
64              << endl;
65         return false;
66     }
67     return ready > 0;
68 }
69 
70 static std::optional<unsigned> parseUnsignedIntFromString(const char* optarg, const char* name) {
71     auto v = strtoul(optarg, nullptr, 0);
72     if (((v == ULONG_MAX) && (errno == ERANGE)) || (v > UINT_MAX)) {
73         cerr << name << " value is out of range: " << optarg << endl;
74     } else if (v != 0) {
75         return v;
76     } else {
77         cerr << name << " value is invalid or missing: " << optarg << endl;
78     }
79 
80     return std::nullopt;
81 }
82 
83 std::optional<VirtualizedVhalServerInfo> VirtualizedVhalServerInfo::fromCommandLine(
84         int argc, char* argv[], std::string* error) {
85     // TODO(egranata): move command-line parsing into vsockinfo
86     std::optional<unsigned int> cid;
87     std::optional<unsigned int> port;
88     std::optional<std::string> powerStateMarkerFilePath;
89     std::optional<std::string> powerStateSocketPath;
90 
91     // unique values to identify the options
92     constexpr int OPT_VHAL_SERVER_CID = 1001;
93     constexpr int OPT_VHAL_SERVER_PORT_NUMBER = 1002;
94     constexpr int OPT_VHAL_SERVER_POWER_STATE_FILE = 1003;
95     constexpr int OPT_VHAL_SERVER_POWER_STATE_SOCKET = 1004;
96 
97     struct option longOptions[] = {
98             {"server_cid", 1, 0, OPT_VHAL_SERVER_CID},
99             {"server_port", 1, 0, OPT_VHAL_SERVER_PORT_NUMBER},
100             {"power_state_file", 1, 0, OPT_VHAL_SERVER_POWER_STATE_FILE},
101             {"power_state_socket", 1, 0, OPT_VHAL_SERVER_POWER_STATE_SOCKET},
102             {},
103     };
104 
105     int optValue;
106     while ((optValue = getopt_long_only(argc, argv, ":", longOptions, 0)) != -1) {
107         switch (optValue) {
108             case OPT_VHAL_SERVER_CID:
109                 cid = parseUnsignedIntFromString(optarg, "cid");
110                 break;
111             case OPT_VHAL_SERVER_PORT_NUMBER:
112                 port = parseUnsignedIntFromString(optarg, "port");
113                 break;
114             case OPT_VHAL_SERVER_POWER_STATE_FILE:
115                 powerStateMarkerFilePath = std::string(optarg);
116                 break;
117             case OPT_VHAL_SERVER_POWER_STATE_SOCKET:
118                 powerStateSocketPath = std::string(optarg);
119                 break;
120             default:
121                 // ignore other options
122                 break;
123         }
124     }
125 
126     if (!cid.has_value() && error) {
127         *error += "Missing server CID. ";
128     }
129     if (!port.has_value() && error) {
130         *error += "Missing server port number. ";
131     }
132     if (!powerStateMarkerFilePath.has_value() && error) {
133         *error += "Missing power state marker file path. ";
134     }
135     if (!powerStateSocketPath.has_value() && error) {
136         *error += "Missing power state socket path. ";
137     }
138 
139     if (cid && port && powerStateMarkerFilePath && powerStateSocketPath) {
140         return VirtualizedVhalServerInfo{
141                 {*cid, *port}, *powerStateMarkerFilePath, *powerStateSocketPath};
142     }
143     return std::nullopt;
144 }
145 
146 #ifdef __BIONIC__
147 std::optional<VirtualizedVhalServerInfo> VirtualizedVhalServerInfo::fromRoPropertyStore() {
148     auto vsock = android::hardware::automotive::utils::VsockConnectionInfo::fromRoPropertyStore(
149             {
150                     "ro.boot.vendor.vehiclehal.server.cid",
151                     "ro.vendor.vehiclehal.server.cid",
152             },
153             {
154                     "ro.boot.vendor.vehiclehal.server.port",
155                     "ro.vendor.vehiclehal.server.port",
156             });
157 
158     if (vsock) {
159         return VirtualizedVhalServerInfo{*vsock, "", ""};
160     }
161     return std::nullopt;
162 }
163 #endif  // __BIONIC__
164 
165 }  // namespace impl
166 }  // namespace V2_0
167 }  // namespace vehicle
168 }  // namespace automotive
169 }  // namespace hardware
170 }  // namespace android
171