1 /*
2 * Copyright (C) 2016 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 <unistd.h>
18 #include <sys/capability.h>
19
20 #include <csignal>
21 #include <memory>
22
23 #include <android-base/logging.h>
24 #include <android-base/macros.h>
25 #include <binder/IPCThreadState.h>
26 #include <binder/IServiceManager.h>
27 #include <binder/ProcessState.h>
28 #include <cutils/properties.h>
29 #include <libminijail.h>
30 #include <utils/String16.h>
31 #include <wifi_system/interface_tool.h>
32
33 #include "wificond/ipc_constants.h"
34 #include "wificond/looper_backed_event_loop.h"
35 #include "wificond/net/netlink_manager.h"
36 #include "wificond/net/netlink_utils.h"
37 #include "wificond/scanning/scan_utils.h"
38 #include "wificond/server.h"
39 #include "wifi_keystore_hal_connector.h"
40
41 using android::net::wifi::nl80211::IWificond;
42 using android::wifi_system::InterfaceTool;
43 using android::wificond::ipc_constants::kServiceName;
44 using android::wificond::WifiKeystoreHalConnector;
45 using std::unique_ptr;
46
47 namespace {
48
49 class ScopedSignalHandler final {
50 public:
ScopedSignalHandler(android::wificond::LooperBackedEventLoop * event_loop)51 ScopedSignalHandler(android::wificond::LooperBackedEventLoop* event_loop) {
52 if (s_event_loop_ != nullptr) {
53 LOG(FATAL) << "Only instantiate one signal handler per process!";
54 }
55 s_event_loop_ = event_loop;
56 std::signal(SIGINT, &ScopedSignalHandler::LeaveLoop);
57 std::signal(SIGTERM, &ScopedSignalHandler::LeaveLoop);
58 }
59
~ScopedSignalHandler()60 ~ScopedSignalHandler() {
61 std::signal(SIGINT, SIG_DFL);
62 std::signal(SIGTERM, SIG_DFL);
63 s_event_loop_ = nullptr;
64 }
65
66 private:
67 static android::wificond::LooperBackedEventLoop* s_event_loop_;
LeaveLoop(int signal)68 static void LeaveLoop(int signal) {
69 if (s_event_loop_ != nullptr) {
70 s_event_loop_->TriggerExit();
71 }
72 }
73
74 DISALLOW_COPY_AND_ASSIGN(ScopedSignalHandler);
75 };
76
77 android::wificond::LooperBackedEventLoop*
78 ScopedSignalHandler::s_event_loop_ = nullptr;
79
80
81 // Setup our interface to the Binder driver or die trying.
SetupBinderOrCrash()82 int SetupBinderOrCrash() {
83 int binder_fd = -1;
84 android::ProcessState::self()->setThreadPoolMaxThreadCount(0);
85 android::IPCThreadState::self()->disableBackgroundScheduling(true);
86 int err = android::IPCThreadState::self()->setupPolling(&binder_fd);
87 CHECK_EQ(err, 0) << "Error setting up binder polling: " << strerror(-err);
88 CHECK_GE(binder_fd, 0) << "Invalid binder FD: " << binder_fd;
89 return binder_fd;
90 }
91
RegisterServiceOrCrash(const android::sp<android::IBinder> & service)92 void RegisterServiceOrCrash(const android::sp<android::IBinder>& service) {
93 android::sp<android::IServiceManager> sm = android::defaultServiceManager();
94 CHECK_EQ(sm != NULL, true) << "Could not obtain IServiceManager";
95
96 CHECK_EQ(sm->addService(android::String16(kServiceName), service),
97 android::NO_ERROR);
98 }
99
100 } // namespace
101
OnBinderReadReady(int fd)102 void OnBinderReadReady(int fd) {
103 android::IPCThreadState::self()->handlePolledCommands();
104 }
105
main(int argc,char ** argv)106 int main(int argc, char** argv) {
107 android::base::InitLogging(argv, android::base::LogdLogger(android::base::SYSTEM));
108 LOG(INFO) << "wificond is starting up...";
109
110 unique_ptr<android::wificond::LooperBackedEventLoop> event_dispatcher(
111 new android::wificond::LooperBackedEventLoop());
112 ScopedSignalHandler scoped_signal_handler(event_dispatcher.get());
113
114 int binder_fd = SetupBinderOrCrash();
115 CHECK(event_dispatcher->WatchFileDescriptor(
116 binder_fd,
117 android::wificond::EventLoop::kModeInput,
118 &OnBinderReadReady)) << "Failed to watch binder FD";
119
120 android::wificond::NetlinkManager netlink_manager(event_dispatcher.get());
121 if (!netlink_manager.Start()) {
122 LOG(ERROR) << "Failed to start netlink manager";
123 }
124 android::wificond::NetlinkUtils netlink_utils(&netlink_manager);
125 android::wificond::ScanUtils scan_utils(&netlink_manager);
126
127 android::sp<android::wificond::Server> server(new android::wificond::Server(
128 unique_ptr<InterfaceTool>(new InterfaceTool),
129 &netlink_utils,
130 &scan_utils));
131 RegisterServiceOrCrash(server);
132
133 WifiKeystoreHalConnector keystore_connector;
134 keystore_connector.start();
135
136 event_dispatcher->Poll();
137 LOG(INFO) << "wificond is about to exit";
138 return 0;
139 }
140