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 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, &gCtls->trafficCtrl); 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 } 184 185 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 } 212 213 static void remove_pid_file() { 214 unlink(PID_FILE_PATH); 215 } 216
