1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*
* Copyright (C) 2008 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 <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <chrono>
#include <cinttypes>
#include <mutex>
#define LOG_TAG "Netd"
#include "log/log.h"
#include <android/binder_manager.h>
#include <android/binder_process.h>
#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <hidl/HidlTransportSupport.h>
#include <netdutils/Stopwatch.h>
#include <processgroup/processgroup.h>
#include "Controllers.h"
#include "FwmarkServer.h"
#include "MDnsSdListener.h"
#include "MDnsService.h"
#include "NFLogListener.h"
#include "NetdConstants.h"
#include "NetdHwAidlService.h"
#include "NetdHwService.h"
#include "NetdNativeService.h"
#include "NetlinkManager.h"
#include "Process.h"
#include "NetdUpdatablePublic.h"
#include "netd_resolv/resolv.h"
using android::IPCThreadState;
using android::sp;
using android::status_t;
using android::String16;
using android::net::FwmarkServer;
using android::net::gCtls;
using android::net::gLog;
using android::net::makeNFLogListener;
using android::net::MDnsService;
using android::net::NetdHwService;
using android::net::NetdNativeService;
using android::net::NetlinkManager;
using android::net::NFLogListener;
using android::net::aidl::NetdHwAidlService;
using android::netdutils::Stopwatch;
const char* const PID_FILE_PATH = "/data/misc/net/netd_pid";
constexpr const char DNSPROXYLISTENER_SOCKET_NAME[] = "dnsproxyd";
std::mutex android::net::gBigNetdLock;
namespace {
void getNetworkContextCallback(uint32_t netId, uint32_t uid, android_net_context* netcontext) {
gCtls->netCtrl.getNetworkContext(netId, uid, netcontext);
}
bool checkCallingPermissionCallback(const char* permission) {
return checkCallingPermission(String16(permission));
}
void logCallback(const char* msg) {
gLog.info(std::string(msg));
}
int tagSocketCallback(int sockFd, uint32_t tag, uid_t uid, pid_t) {
// Workaround for secureVPN with VpnIsolation enabled, refer to b/159994981 for details.
if (tag == TAG_SYSTEM_DNS) uid = AID_DNS;
return libnetd_updatable_tagSocket(sockFd, tag, uid, AID_DNS);
}
bool evaluateDomainNameCallback(const android_net_context&, const char* /*name*/) {
return true;
}
bool initDnsResolver() {
ResolverNetdCallbacks callbacks = {
.check_calling_permission = &checkCallingPermissionCallback,
.get_network_context = &getNetworkContextCallback,
.log = &logCallback,
.tagSocket = &tagSocketCallback,
.evaluate_domain_name = &evaluateDomainNameCallback,
};
return resolv_init(&callbacks);
}
} // namespace
int main() {
Stopwatch s;
gLog.info("netd 1.0 starting");
android::net::process::removePidFile(PID_FILE_PATH);
gLog.info("Pid file removed");
android::net::process::blockSigPipe();
gLog.info("SIGPIPE is blocked");
// Before we do anything that could fork, mark CLOEXEC the UNIX sockets that we get from init.
// FrameworkListener does this on initialization as well, but we only initialize these
// components after having initialized other subsystems that can fork.
for (const auto& sock :
{DNSPROXYLISTENER_SOCKET_NAME, FwmarkServer::SOCKET_NAME, MDnsSdListener::SOCKET_NAME}) {
setCloseOnExec(sock);
gLog.info("setCloseOnExec(%s)", sock);
}
std::string cg2_path;
if (!CgroupGetControllerPath(CGROUPV2_CONTROLLER_NAME, &cg2_path)) {
ALOGE("Failed to find cgroup v2 root %s", strerror(errno));
exit(1);
}
if (libnetd_updatable_init(cg2_path.c_str())) {
ALOGE("libnetd_updatable_init failed");
exit(1);
}
gLog.info("libnetd_updatable_init success");
NetlinkManager *nm = NetlinkManager::Instance();
if (nm == nullptr) {
ALOGE("Unable to create NetlinkManager");
exit(1);
};
gLog.info("NetlinkManager instanced");
gCtls = new android::net::Controllers();
gCtls->init();
if (nm->start()) {
ALOGE("Unable to start NetlinkManager (%s)", strerror(errno));
exit(1);
}
std::unique_ptr<NFLogListener> logListener;
{
auto result = makeNFLogListener();
if (!isOk(result)) {
ALOGE("Unable to create NFLogListener: %s", toString(result).c_str());
exit(1);
}
logListener = std::move(result.value());
auto status = gCtls->wakeupCtrl.init(logListener.get());
if (!isOk(status)) {
gLog.error("Unable to init WakeupController: %s", toString(status).c_str());
// We can still continue without wakeup packet logging.
}
}
// Set local DNS mode, to prevent bionic from proxying
// back to this service, recursively.
// TODO: Check if we could remove it since resolver cache no loger
// checks this environment variable after aosp/838050.
setenv("ANDROID_DNS_MODE", "local", 1);
// Note that only call initDnsResolver after gCtls initializing.
if (!initDnsResolver()) {
ALOGE("Unable to init resolver");
exit(1);
}
FwmarkServer fwmarkServer(&gCtls->netCtrl, &gCtls->eventReporter);
if (fwmarkServer.startListener()) {
ALOGE("Unable to start FwmarkServer (%s)", strerror(errno));
exit(1);
}
Stopwatch subTime;
status_t ret;
if ((ret = NetdNativeService::start()) != android::OK) {
ALOGE("Unable to start NetdNativeService: %d", ret);
exit(1);
}
gLog.info("Registering NetdNativeService: %" PRId64 "us", subTime.getTimeAndResetUs());
if ((ret = MDnsService::start()) != android::OK) {
ALOGE("Unable to start MDnsService: %d", ret);
exit(1);
}
gLog.info("Registering MDnsService: %" PRId64 "us", subTime.getTimeAndResetUs());
android::net::process::ScopedPidFile pidFile(PID_FILE_PATH);
// Now that netd is ready to process commands, advertise service availability for HAL clients.
// Usage of this HAL is anticipated to be thin; one thread per HAL service should suffice,
// AIDL and HIDL.
android::hardware::configureRpcThreadpool(2, true /* callerWillJoin */);
IPCThreadState::self()->disableBackgroundScheduling(true);
std::thread aidlService = std::thread(NetdHwAidlService::run);
sp<NetdHwService> mHwSvc(new NetdHwService());
bool startedHidlService = true;
if ((ret = mHwSvc->start()) != android::OK) {
ALOGE("Unable to start HIDL NetdHwService: %d", ret);
startedHidlService = false;
}
gLog.info("Registering NetdHwService: %" PRId64 "us", subTime.getTimeAndResetUs());
gLog.info("Netd started in %" PRId64 "us", s.timeTakenUs());
if (startedHidlService) {
IPCThreadState::self()->joinThreadPool();
}
aidlService.join();
gLog.info("netd exiting");
exit(0);
}
|
