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 <chrono>
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <signal.h>
21 #include <errno.h>
22 #include <string.h>
23 #include <mutex>
24 #include <sys/stat.h>
25 #include <sys/types.h>
26 #include <sys/wait.h>
27
28 #include <fcntl.h>
29 #include <dirent.h>
30
31 #define LOG_TAG "Netd"
32
33 #include "log/log.h"
34
35 #include <android-base/properties.h>
36 #include <binder/IPCThreadState.h>
37 #include <binder/IServiceManager.h>
38 #include <netdutils/Stopwatch.h>
39
40 #include "Controllers.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 "Process.h"
49
50 #include "netd_resolv/resolv.h"
51 #include "netd_resolv/resolv_stub.h"
52
53 using android::IPCThreadState;
54 using android::status_t;
55 using android::String16;
56 using android::net::FwmarkServer;
57 using android::net::gCtls;
58 using android::net::gLog;
59 using android::net::makeNFLogListener;
60 using android::net::NetdHwService;
61 using android::net::NetdNativeService;
62 using android::net::NetlinkManager;
63 using android::net::NFLogListener;
64 using android::netdutils::Stopwatch;
65
66 const char* const PID_FILE_PATH = "/data/misc/net/netd_pid";
67 constexpr const char DNSPROXYLISTENER_SOCKET_NAME[] = "dnsproxyd";
68
69 std::mutex android::net::gBigNetdLock;
70
71 namespace {
72
getNetworkContextCallback(uint32_t netId,uint32_t uid,android_net_context * netcontext)73 void getNetworkContextCallback(uint32_t netId, uint32_t uid, android_net_context* netcontext) {
74 gCtls->netCtrl.getNetworkContext(netId, uid, netcontext);
75 }
76
checkCallingPermissionCallback(const char * permission)77 bool checkCallingPermissionCallback(const char* permission) {
78 return checkCallingPermission(String16(permission));
79 }
80
logCallback(const char * msg)81 void logCallback(const char* msg) {
82 gLog.info(std::string(msg));
83 }
84
initDnsResolver()85 bool initDnsResolver() {
86 ResolverNetdCallbacks callbacks = {
87 .get_network_context = &getNetworkContextCallback,
88 .log = &logCallback,
89 .check_calling_permission = &checkCallingPermissionCallback,
90 };
91 return RESOLV_STUB.resolv_init(callbacks);
92 }
93
94 } // namespace
95
main()96 int main() {
97 Stopwatch s;
98 gLog.info("netd 1.0 starting");
99
100 android::net::process::removePidFile(PID_FILE_PATH);
101 android::net::process::blockSigPipe();
102
103 // Before we do anything that could fork, mark CLOEXEC the UNIX sockets that we get from init.
104 // FrameworkListener does this on initialization as well, but we only initialize these
105 // components after having initialized other subsystems that can fork.
106 for (const auto& sock :
107 {DNSPROXYLISTENER_SOCKET_NAME, FwmarkServer::SOCKET_NAME, MDnsSdListener::SOCKET_NAME}) {
108 setCloseOnExec(sock);
109 }
110
111 // Before we start any threads, populate the resolver stub pointers.
112 resolv_stub_init();
113
114 // Make sure BPF programs are loaded before doing anything
115 while (!android::base::WaitForProperty("bpf.progs_loaded", "1",
116 std::chrono::seconds(5))) {
117 ALOGD("netd waited 5s for bpf.progs_loaded, still waiting...");
118 }
119
120 NetlinkManager *nm = NetlinkManager::Instance();
121 if (nm == nullptr) {
122 ALOGE("Unable to create NetlinkManager");
123 exit(1);
124 };
125
126 gCtls = new android::net::Controllers();
127 gCtls->init();
128
129 if (nm->start()) {
130 ALOGE("Unable to start NetlinkManager (%s)", strerror(errno));
131 exit(1);
132 }
133
134 std::unique_ptr<NFLogListener> logListener;
135 {
136 auto result = makeNFLogListener();
137 if (!isOk(result)) {
138 ALOGE("Unable to create NFLogListener: %s", toString(result).c_str());
139 exit(1);
140 }
141 logListener = std::move(result.value());
142 auto status = gCtls->wakeupCtrl.init(logListener.get());
143 if (!isOk(result)) {
144 gLog.error("Unable to init WakeupController: %s", toString(result).c_str());
145 // We can still continue without wakeup packet logging.
146 }
147 }
148
149 // Set local DNS mode, to prevent bionic from proxying
150 // back to this service, recursively.
151 // TODO: Check if we could remove it since resolver cache no loger
152 // checks this environment variable after aosp/838050.
153 setenv("ANDROID_DNS_MODE", "local", 1);
154 // Note that only call initDnsResolver after gCtls initializing.
155 if (!initDnsResolver()) {
156 ALOGE("Unable to init resolver");
157 exit(1);
158 }
159
160 MDnsSdListener mdnsl;
161 if (mdnsl.startListener()) {
162 ALOGE("Unable to start MDnsSdListener (%s)", strerror(errno));
163 exit(1);
164 }
165
166 FwmarkServer fwmarkServer(&gCtls->netCtrl, &gCtls->eventReporter, &gCtls->trafficCtrl);
167 if (fwmarkServer.startListener()) {
168 ALOGE("Unable to start FwmarkServer (%s)", strerror(errno));
169 exit(1);
170 }
171
172 Stopwatch subTime;
173 status_t ret;
174 if ((ret = NetdNativeService::start()) != android::OK) {
175 ALOGE("Unable to start NetdNativeService: %d", ret);
176 exit(1);
177 }
178 gLog.info("Registering NetdNativeService: %.1fms", subTime.getTimeAndReset());
179
180 android::net::process::ScopedPidFile pidFile(PID_FILE_PATH);
181
182 // Now that netd is ready to process commands, advertise service
183 // availability for HAL clients.
184 NetdHwService mHwSvc;
185 if ((ret = mHwSvc.start()) != android::OK) {
186 ALOGE("Unable to start NetdHwService: %d", ret);
187 exit(1);
188 }
189 gLog.info("Registering NetdHwService: %.1fms", subTime.getTimeAndReset());
190
191 gLog.info("Netd started in %dms", static_cast<int>(s.timeTaken()));
192
193 IPCThreadState::self()->joinThreadPool();
194
195 gLog.info("netd exiting");
196
197 exit(0);
198 }
199