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 /* 121 * Now that we're up, we can respond to commands 122 */ 123 if (cl->startListener()) { 124 PLOG(ERROR) << "Unable to start CommandListener"; 125 exit(1); 126 } 127 128 if (ccl->startListener()) { 129 PLOG(ERROR) << "Unable to start CryptCommandListener"; 130 exit(1); 131 } 132 133 // This call should go after listeners are started to avoid 134 // a deadlock between vold and init (see b/34278978 for details) 135 property_set("vold.has_adoptable", has_adoptable ? "1" : "0"); 136 137 // Do coldboot here so it won't block booting, 138 // also the cold boot is needed in case we have flash drive 139 // connected before Vold launched 140 coldboot("/sys/block"); 141 // Eventually we'll become the monitoring thread 142 while(1) { 143 pause(); 144 } 145 146 LOG(ERROR) << "Vold exiting"; 147 exit(0); 148} 149 150static void parse_args(int argc, char** argv) { 151 static struct option opts[] = { 152 {"blkid_context", required_argument, 0, 'b' }, 153 {"blkid_untrusted_context", required_argument, 0, 'B' }, 154 {"fsck_context", required_argument, 0, 'f' }, 155 {"fsck_untrusted_context", required_argument, 0, 'F' }, 156 }; 157 158 int c; 159 while ((c = getopt_long(argc, argv, "", opts, nullptr)) != -1) { 160 switch (c) { 161 case 'b': android::vold::sBlkidContext = optarg; break; 162 case 'B': android::vold::sBlkidUntrustedContext = optarg; break; 163 case 'f': android::vold::sFsckContext = optarg; break; 164 case 'F': android::vold::sFsckUntrustedContext = optarg; break; 165 } 166 } 167 168 CHECK(android::vold::sBlkidContext != nullptr); 169 CHECK(android::vold::sBlkidUntrustedContext != nullptr); 170 CHECK(android::vold::sFsckContext != nullptr); 171 CHECK(android::vold::sFsckUntrustedContext != nullptr); 172} 173 174static void do_coldboot(DIR *d, int lvl) { 175 struct dirent *de; 176 int dfd, fd; 177 178 dfd = dirfd(d); 179 180 fd = openat(dfd, "uevent", O_WRONLY | O_CLOEXEC); 181 if(fd >= 0) { 182 write(fd, "add\n", 4); 183 close(fd); 184 } 185 186 while((de = readdir(d))) { 187 DIR *d2; 188 189 if (de->d_name[0] == '.') 190 continue; 191 192 if (de->d_type != DT_DIR && lvl > 0) 193 continue; 194 195 fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY | O_CLOEXEC); 196 if(fd < 0) 197 continue; 198 199 d2 = fdopendir(fd); 200 if(d2 == 0) 201 close(fd); 202 else { 203 do_coldboot(d2, lvl + 1); 204 closedir(d2); 205 } 206 } 207} 208 209static void coldboot(const char *path) { 210 DIR *d = opendir(path); 211 if(d) { 212 do_coldboot(d, 0); 213 closedir(d); 214 } 215} 216 217static int process_config(VolumeManager *vm, bool* has_adoptable) { 218 fstab = fs_mgr_read_fstab_default(); 219 if (!fstab) { 220 PLOG(ERROR) << "Failed to open default fstab"; 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