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 "Disk.h" 18#include "VolumeManager.h" 19#include "CommandListener.h" 20#include "CryptCommandListener.h" 21#include "NetlinkManager.h" 22#include "cryptfs.h" 23#include "sehandle.h" 24 25#include <android-base/logging.h> 26#include <android-base/stringprintf.h> 27#include <cutils/klog.h> 28#include <cutils/properties.h> 29#include <cutils/sockets.h> 30 31#include <stdio.h> 32#include <stdlib.h> 33#include <errno.h> 34#include <string.h> 35#include <sys/stat.h> 36#include <sys/types.h> 37#include <getopt.h> 38#include <fcntl.h> 39#include <dirent.h> 40#include <fs_mgr.h> 41 42static int process_config(VolumeManager *vm, bool* has_adoptable); 43static void coldboot(const char *path); 44static void parse_args(int argc, char** argv); 45 46struct fstab *fstab; 47 48struct selabel_handle *sehandle; 49 50using android::base::StringPrintf; 51 52int main(int argc, char** argv) { 53 setenv("ANDROID_LOG_TAGS", "*:v", 1); 54 android::base::InitLogging(argv, android::base::LogdLogger(android::base::SYSTEM)); 55 56 LOG(INFO) << "Vold 3.0 (the awakening) firing up"; 57 58 LOG(VERBOSE) << "Detected support for:" 59 << (android::vold::IsFilesystemSupported("ext4") ? " ext4" : "") 60 << (android::vold::IsFilesystemSupported("f2fs") ? " f2fs" : "") 61 << (android::vold::IsFilesystemSupported("vfat") ? " vfat" : ""); 62 63 VolumeManager *vm; 64 CommandListener *cl; 65 CryptCommandListener *ccl; 66 NetlinkManager *nm; 67 68 parse_args(argc, argv); 69 70 sehandle = selinux_android_file_context_handle(); 71 if (sehandle) { 72 selinux_android_set_sehandle(sehandle); 73 } 74 75 // Quickly throw a CLOEXEC on the socket we just inherited from init 76 fcntl(android_get_control_socket("vold"), F_SETFD, FD_CLOEXEC); 77 fcntl(android_get_control_socket("cryptd"), F_SETFD, FD_CLOEXEC); 78 79 mkdir("/dev/block/vold", 0755); 80 81 /* For when cryptfs checks and mounts an encrypted filesystem */ 82 klog_set_level(6); 83 84 /* Create our singleton managers */ 85 if (!(vm = VolumeManager::Instance())) { 86 LOG(ERROR) << "Unable to create VolumeManager"; 87 exit(1); 88 } 89 90 if (!(nm = NetlinkManager::Instance())) { 91 LOG(ERROR) << "Unable to create NetlinkManager"; 92 exit(1); 93 } 94 95 if (property_get_bool("vold.debug", false)) { 96 vm->setDebug(true); 97 } 98 99 cl = new CommandListener(); 100 ccl = new CryptCommandListener(); 101 vm->setBroadcaster((SocketListener *) cl); 102 nm->setBroadcaster((SocketListener *) cl); 103 104 if (vm->start()) { 105 PLOG(ERROR) << "Unable to start VolumeManager"; 106 exit(1); 107 } 108 109 bool has_adoptable; 110 111 if (process_config(vm, &has_adoptable)) { 112 PLOG(ERROR) << "Error reading configuration... continuing anyways"; 113 } 114 115 if (nm->start()) { 116 PLOG(ERROR) << "Unable to start NetlinkManager"; 117 exit(1); 118 } 119 120 coldboot("/sys/block"); 121// coldboot("/sys/class/switch"); 122 123 /* 124 * Now that we're up, we can respond to commands 125 */ 126 if (cl->startListener()) { 127 PLOG(ERROR) << "Unable to start CommandListener"; 128 exit(1); 129 } 130 131 if (ccl->startListener()) { 132 PLOG(ERROR) << "Unable to start CryptCommandListener"; 133 exit(1); 134 } 135 136 // This call should go after listeners are started to avoid 137 // a deadlock between vold and init (see b/34278978 for details) 138 property_set("vold.has_adoptable", has_adoptable ? "1" : "0"); 139 140 // Eventually we'll become the monitoring thread 141 while(1) { 142 sleep(1000); 143 } 144 145 LOG(ERROR) << "Vold exiting"; 146 exit(0); 147} 148 149static void parse_args(int argc, char** argv) { 150 static struct option opts[] = { 151 {"blkid_context", required_argument, 0, 'b' }, 152 {"blkid_untrusted_context", required_argument, 0, 'B' }, 153 {"fsck_context", required_argument, 0, 'f' }, 154 {"fsck_untrusted_context", required_argument, 0, 'F' }, 155 }; 156 157 int c; 158 while ((c = getopt_long(argc, argv, "", opts, nullptr)) != -1) { 159 switch (c) { 160 case 'b': android::vold::sBlkidContext = optarg; break; 161 case 'B': android::vold::sBlkidUntrustedContext = optarg; break; 162 case 'f': android::vold::sFsckContext = optarg; break; 163 case 'F': android::vold::sFsckUntrustedContext = optarg; break; 164 } 165 } 166 167 CHECK(android::vold::sBlkidContext != nullptr); 168 CHECK(android::vold::sBlkidUntrustedContext != nullptr); 169 CHECK(android::vold::sFsckContext != nullptr); 170 CHECK(android::vold::sFsckUntrustedContext != nullptr); 171} 172 173static void do_coldboot(DIR *d, int lvl) { 174 struct dirent *de; 175 int dfd, fd; 176 177 dfd = dirfd(d); 178 179 fd = openat(dfd, "uevent", O_WRONLY | O_CLOEXEC); 180 if(fd >= 0) { 181 write(fd, "add\n", 4); 182 close(fd); 183 } 184 185 while((de = readdir(d))) { 186 DIR *d2; 187 188 if (de->d_name[0] == '.') 189 continue; 190 191 if (de->d_type != DT_DIR && lvl > 0) 192 continue; 193 194 fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY); 195 if(fd < 0) 196 continue; 197 198 d2 = fdopendir(fd); 199 if(d2 == 0) 200 close(fd); 201 else { 202 do_coldboot(d2, lvl + 1); 203 closedir(d2); 204 } 205 } 206} 207 208static void coldboot(const char *path) { 209 DIR *d = opendir(path); 210 if(d) { 211 do_coldboot(d, 0); 212 closedir(d); 213 } 214} 215 216static int process_config(VolumeManager *vm, bool* has_adoptable) { 217 std::string path(android::vold::DefaultFstabPath()); 218 fstab = fs_mgr_read_fstab(path.c_str()); 219 if (!fstab) { 220 PLOG(ERROR) << "Failed to open default fstab " << path; 221 return -1; 222 } 223 224 /* Loop through entries looking for ones that vold manages */ 225 *has_adoptable = false; 226 for (int i = 0; i < fstab->num_entries; i++) { 227 if (fs_mgr_is_voldmanaged(&fstab->recs[i])) { 228 if (fs_mgr_is_nonremovable(&fstab->recs[i])) { 229 LOG(WARNING) << "nonremovable no longer supported; ignoring volume"; 230 continue; 231 } 232 233 std::string sysPattern(fstab->recs[i].blk_device); 234 std::string nickname(fstab->recs[i].label); 235 int flags = 0; 236 237 if (fs_mgr_is_encryptable(&fstab->recs[i])) { 238 flags |= android::vold::Disk::Flags::kAdoptable; 239 *has_adoptable = true; 240 } 241 if (fs_mgr_is_noemulatedsd(&fstab->recs[i]) 242 || property_get_bool("vold.debug.default_primary", false)) { 243 flags |= android::vold::Disk::Flags::kDefaultPrimary; 244 } 245 246 vm->addDiskSource(std::shared_ptr<VolumeManager::DiskSource>( 247 new VolumeManager::DiskSource(sysPattern, nickname, flags))); 248 } 249 } 250 return 0; 251} 252