1 /*
2 * Copyright (C) 2008 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 <stdio.h>
18 #include <stdlib.h>
19 #include <signal.h>
20 #include <errno.h>
21 #include <string.h>
22 #include <sys/stat.h>
23 #include <sys/types.h>
24 #include <sys/wait.h>
25
26 #include <fcntl.h>
27 #include <dirent.h>
28
29 #define LOG_TAG "Netd"
30
31 #include "cutils/log.h"
32 #include "utils/RWLock.h"
33
34 #include <binder/IPCThreadState.h>
35 #include <binder/IServiceManager.h>
36 #include <binder/ProcessState.h>
37
38 #include "CommandListener.h"
39 #include "Controllers.h"
40 #include "DnsProxyListener.h"
41 #include "FwmarkServer.h"
42 #include "MDnsSdListener.h"
43 #include "NFLogListener.h"
44 #include "NetdConstants.h"
45 #include "NetdHwService.h"
46 #include "NetdNativeService.h"
47 #include "NetlinkManager.h"
48 #include "Stopwatch.h"
49
50 using android::status_t;
51 using android::sp;
52 using android::IPCThreadState;
53 using android::ProcessState;
54 using android::defaultServiceManager;
55 using android::net::CommandListener;
56 using android::net::DnsProxyListener;
57 using android::net::FwmarkServer;
58 using android::net::NetdHwService;
59 using android::net::NetdNativeService;
60 using android::net::NetlinkManager;
61 using android::net::NFLogListener;
62 using android::net::makeNFLogListener;
63
64 static void remove_pid_file();
65 static bool write_pid_file();
66
67 const char* const PID_FILE_PATH = "/data/misc/net/netd_pid";
68 const int PID_FILE_FLAGS = O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW | O_CLOEXEC;
69 const mode_t PID_FILE_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r--
70
71 android::RWLock android::net::gBigNetdLock;
72
main()73 int main() {
74 using android::net::gCtls;
75 Stopwatch s;
76
77 ALOGI("Netd 1.0 starting");
78 remove_pid_file();
79
80 blockSigpipe();
81
82 // Before we do anything that could fork, mark CLOEXEC the UNIX sockets that we get from init.
83 // FrameworkListener does this on initialization as well, but we only initialize these
84 // components after having initialized other subsystems that can fork.
85 for (const auto& sock : { CommandListener::SOCKET_NAME,
86 DnsProxyListener::SOCKET_NAME,
87 FwmarkServer::SOCKET_NAME,
88 MDnsSdListener::SOCKET_NAME }) {
89 setCloseOnExec(sock);
90 }
91
92 NetlinkManager *nm = NetlinkManager::Instance();
93 if (nm == nullptr) {
94 ALOGE("Unable to create NetlinkManager");
95 exit(1);
96 };
97
98 gCtls = new android::net::Controllers();
99 gCtls->init();
100
101 CommandListener cl;
102 nm->setBroadcaster((SocketListener *) &cl);
103
104 if (nm->start()) {
105 ALOGE("Unable to start NetlinkManager (%s)", strerror(errno));
106 exit(1);
107 }
108
109 std::unique_ptr<NFLogListener> logListener;
110 {
111 auto result = makeNFLogListener();
112 if (!isOk(result)) {
113 ALOGE("Unable to create NFLogListener: %s", toString(result).c_str());
114 exit(1);
115 }
116 logListener = std::move(result.value());
117 auto status = gCtls->wakeupCtrl.init(logListener.get());
118 if (!isOk(result)) {
119 ALOGE("Unable to init WakeupController: %s", toString(result).c_str());
120 // We can still continue without wakeup packet logging.
121 }
122 }
123
124 // Set local DNS mode, to prevent bionic from proxying
125 // back to this service, recursively.
126 setenv("ANDROID_DNS_MODE", "local", 1);
127 DnsProxyListener dpl(&gCtls->netCtrl, &gCtls->eventReporter);
128 if (dpl.startListener()) {
129 ALOGE("Unable to start DnsProxyListener (%s)", strerror(errno));
130 exit(1);
131 }
132
133 MDnsSdListener mdnsl;
134 if (mdnsl.startListener()) {
135 ALOGE("Unable to start MDnsSdListener (%s)", strerror(errno));
136 exit(1);
137 }
138
139 FwmarkServer fwmarkServer(&gCtls->netCtrl, &gCtls->eventReporter);
140 if (fwmarkServer.startListener()) {
141 ALOGE("Unable to start FwmarkServer (%s)", strerror(errno));
142 exit(1);
143 }
144
145 Stopwatch subTime;
146 status_t ret;
147 if ((ret = NetdNativeService::start()) != android::OK) {
148 ALOGE("Unable to start NetdNativeService: %d", ret);
149 exit(1);
150 }
151 ALOGI("Registering NetdNativeService: %.1fms", subTime.getTimeAndReset());
152
153 /*
154 * Now that we're up, we can respond to commands. Starting the listener also tells
155 * NetworkManagementService that we are up and that our binder interface is ready.
156 */
157 if (cl.startListener()) {
158 ALOGE("Unable to start CommandListener (%s)", strerror(errno));
159 exit(1);
160 }
161 ALOGI("Starting CommandListener: %.1fms", subTime.getTimeAndReset());
162
163 write_pid_file();
164
165 // Now that netd is ready to process commands, advertise service
166 // availability for HAL clients.
167 NetdHwService mHwSvc;
168 if ((ret = mHwSvc.start()) != android::OK) {
169 ALOGE("Unable to start NetdHwService: %d", ret);
170 exit(1);
171 }
172 ALOGI("Registering NetdHwService: %.1fms", subTime.getTimeAndReset());
173
174 ALOGI("Netd started in %dms", static_cast<int>(s.timeTaken()));
175
176 IPCThreadState::self()->joinThreadPool();
177
178 ALOGI("Netd exiting");
179
180 remove_pid_file();
181
182 exit(0);
183 }
184
write_pid_file()185 static bool write_pid_file() {
186 char pid_buf[INT32_STRLEN];
187 snprintf(pid_buf, sizeof(pid_buf), "%d\n", (int) getpid());
188
189 int fd = open(PID_FILE_PATH, PID_FILE_FLAGS, PID_FILE_MODE);
190 if (fd == -1) {
191 ALOGE("Unable to create pid file (%s)", strerror(errno));
192 return false;
193 }
194
195 // File creation is affected by umask, so make sure the right mode bits are set.
196 if (fchmod(fd, PID_FILE_MODE) == -1) {
197 ALOGE("failed to set mode 0%o on %s (%s)", PID_FILE_MODE, PID_FILE_PATH, strerror(errno));
198 close(fd);
199 remove_pid_file();
200 return false;
201 }
202
203 if (write(fd, pid_buf, strlen(pid_buf)) != (ssize_t)strlen(pid_buf)) {
204 ALOGE("Unable to write to pid file (%s)", strerror(errno));
205 close(fd);
206 remove_pid_file();
207 return false;
208 }
209 close(fd);
210 return true;
211 }
212
remove_pid_file()213 static void remove_pid_file() {
214 unlink(PID_FILE_PATH);
215 }
216