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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // RemovableDeviceNotificationsLinux implementation. | |
| 6 | |
| 7 #include "chrome/browser/storage_monitor/removable_device_notifications_linux.h" | |
| 8 | |
| 9 #include <mntent.h> | |
| 10 #include <stdio.h> | |
| 11 | |
| 12 #include <list> | |
| 13 | |
| 14 #include "base/basictypes.h" | |
| 15 #include "base/bind.h" | |
| 16 #include "base/files/file_path.h" | |
| 17 #include "base/metrics/histogram.h" | |
| 18 #include "base/stl_util.h" | |
| 19 #include "base/string_util.h" | |
| 20 #include "base/strings/string_number_conversions.h" | |
| 21 #include "base/utf_string_conversions.h" | |
| 22 #include "chrome/browser/storage_monitor/media_device_notifications_utils.h" | |
| 23 #include "chrome/browser/storage_monitor/media_storage_util.h" | |
| 24 #include "chrome/browser/storage_monitor/removable_device_constants.h" | |
| 25 #include "chrome/browser/storage_monitor/udev_util_linux.h" | |
| 26 | |
| 27 namespace chrome { | |
| 28 | |
| 29 using content::BrowserThread; | |
| 30 | |
| 31 namespace { | |
| 32 | |
| 33 // List of file systems we care about. | |
| 34 const char* const kKnownFileSystems[] = { | |
| 35 "ext2", | |
| 36 "ext3", | |
| 37 "ext4", | |
| 38 "fat", | |
| 39 "hfsplus", | |
| 40 "iso9660", | |
| 41 "msdos", | |
| 42 "ntfs", | |
| 43 "udf", | |
| 44 "vfat", | |
| 45 }; | |
| 46 | |
| 47 // udev device property constants. | |
| 48 const char kBlockSubsystemKey[] = "block"; | |
| 49 const char kDiskDeviceTypeKey[] = "disk"; | |
| 50 const char kFsUUID[] = "ID_FS_UUID"; | |
| 51 const char kLabel[] = "ID_FS_LABEL"; | |
| 52 const char kModel[] = "ID_MODEL"; | |
| 53 const char kModelID[] = "ID_MODEL_ID"; | |
| 54 const char kRemovableSysAttr[] = "removable"; | |
| 55 const char kSerialShort[] = "ID_SERIAL_SHORT"; | |
| 56 const char kSizeSysAttr[] = "size"; | |
| 57 const char kVendor[] = "ID_VENDOR"; | |
| 58 const char kVendorID[] = "ID_VENDOR_ID"; | |
| 59 | |
| 60 // (mount point, mount device) | |
| 61 // A mapping from mount point to mount device, as extracted from the mtab | |
| 62 // file. | |
| 63 typedef std::map<base::FilePath, base::FilePath> MountPointDeviceMap; | |
| 64 | |
| 65 // Reads mtab file entries into |mtab|. | |
| 66 void ReadMtab(const base::FilePath& mtab_path, | |
| 67 const std::set<std::string>& interesting_file_systems, | |
| 68 MountPointDeviceMap* mtab) { | |
| 69 mtab->clear(); | |
| 70 | |
| 71 FILE* fp = setmntent(mtab_path.value().c_str(), "r"); | |
| 72 if (!fp) | |
| 73 return; | |
| 74 | |
| 75 mntent entry; | |
| 76 char buf[512]; | |
| 77 | |
| 78 // We return the same device mounted to multiple locations, but hide | |
| 79 // devices that have been mounted over. | |
| 80 while (getmntent_r(fp, &entry, buf, sizeof(buf))) { | |
| 81 // We only care about real file systems. | |
| 82 if (!ContainsKey(interesting_file_systems, entry.mnt_type)) | |
| 83 continue; | |
| 84 | |
| 85 (*mtab)[base::FilePath(entry.mnt_dir)] = base::FilePath(entry.mnt_fsname); | |
| 86 } | |
| 87 endmntent(fp); | |
| 88 } | |
| 89 | |
| 90 // Construct a device id using label or manufacturer (vendor and model) details. | |
| 91 std::string MakeDeviceUniqueId(struct udev_device* device) { | |
| 92 std::string uuid = GetUdevDevicePropertyValue(device, kFsUUID); | |
| 93 if (!uuid.empty()) | |
| 94 return kFSUniqueIdPrefix + uuid; | |
| 95 | |
| 96 // If one of the vendor, model, serial information is missing, its value | |
| 97 // in the string is empty. | |
| 98 // Format: VendorModelSerial:VendorInfo:ModelInfo:SerialShortInfo | |
| 99 // E.g.: VendorModelSerial:Kn:DataTravel_12.10:8000000000006CB02CDB | |
| 100 std::string vendor = GetUdevDevicePropertyValue(device, kVendorID); | |
| 101 std::string model = GetUdevDevicePropertyValue(device, kModelID); | |
| 102 std::string serial_short = GetUdevDevicePropertyValue(device, | |
| 103 kSerialShort); | |
| 104 if (vendor.empty() && model.empty() && serial_short.empty()) | |
| 105 return std::string(); | |
| 106 | |
| 107 return kVendorModelSerialPrefix + vendor + ":" + model + ":" + serial_short; | |
| 108 } | |
| 109 | |
| 110 // Records GetDeviceInfo result, to see how often we fail to get device details. | |
| 111 void RecordGetDeviceInfoResult(bool result) { | |
| 112 UMA_HISTOGRAM_BOOLEAN("MediaDeviceNotification.UdevRequestSuccess", result); | |
| 113 } | |
| 114 | |
| 115 // Returns the storage partition size of the device specified by |device_path|. | |
| 116 // If the requested information is unavailable, returns 0. | |
| 117 uint64 GetDeviceStorageSize(const base::FilePath& device_path, | |
| 118 struct udev_device* device) { | |
| 119 // sysfs provides the device size in units of 512-byte blocks. | |
| 120 const std::string partition_size = udev_device_get_sysattr_value( | |
| 121 device, kSizeSysAttr); | |
| 122 | |
| 123 // Keep track of device size, to see how often this information is | |
| 124 // unavailable. | |
| 125 UMA_HISTOGRAM_BOOLEAN( | |
| 126 "RemovableDeviceNotificationsLinux.device_partition_size_available", | |
| 127 !partition_size.empty()); | |
| 128 | |
| 129 uint64 total_size_in_bytes = 0; | |
| 130 if (!base::StringToUint64(partition_size, &total_size_in_bytes)) | |
| 131 return 0; | |
| 132 return (total_size_in_bytes <= kuint64max / 512) ? | |
| 133 total_size_in_bytes * 512 : 0; | |
| 134 } | |
| 135 | |
| 136 // Constructs the device name from the device properties. If the device details | |
| 137 // are unavailable, returns an empty string. | |
| 138 string16 GetDeviceName(struct udev_device* device) { | |
| 139 std::string device_label = GetUdevDevicePropertyValue(device, kLabel); | |
| 140 if (!device_label.empty() && IsStringUTF8(device_label)) | |
| 141 return UTF8ToUTF16(device_label); | |
| 142 | |
| 143 device_label = GetUdevDevicePropertyValue(device, kFsUUID); | |
| 144 // Keep track of device uuid, to see how often we receive empty uuid values. | |
| 145 UMA_HISTOGRAM_BOOLEAN( | |
| 146 "RemovableDeviceNotificationsLinux.device_file_system_uuid_available", | |
| 147 !device_label.empty()); | |
| 148 | |
| 149 const string16 name = GetFullProductName( | |
| 150 GetUdevDevicePropertyValue(device, kVendor), | |
| 151 GetUdevDevicePropertyValue(device, kModel)); | |
| 152 | |
| 153 const string16 device_label_utf16 = | |
| 154 (!device_label.empty() && IsStringUTF8(device_label)) ? | |
| 155 UTF8ToUTF16(device_label) : string16(); | |
| 156 if (!name.empty() && !device_label_utf16.empty()) | |
| 157 return device_label_utf16 + ASCIIToUTF16(" ") + name; | |
| 158 return name.empty() ? device_label_utf16 : name; | |
| 159 } | |
| 160 | |
| 161 // Get the device information using udev library. | |
| 162 // On success, returns true and fill in |unique_id|, |name|, |removable| and | |
| 163 // |partition_size_in_bytes|. | |
| 164 void GetDeviceInfo(const base::FilePath& device_path, | |
| 165 std::string* unique_id, | |
| 166 string16* name, | |
| 167 bool* removable, | |
| 168 uint64* partition_size_in_bytes) { | |
| 169 DCHECK(!device_path.empty()); | |
| 170 ScopedUdevObject udev_obj(udev_new()); | |
| 171 if (!udev_obj.get()) { | |
| 172 RecordGetDeviceInfoResult(false); | |
| 173 return; | |
| 174 } | |
| 175 | |
| 176 struct stat device_stat; | |
| 177 if (stat(device_path.value().c_str(), &device_stat) < 0) { | |
| 178 RecordGetDeviceInfoResult(false); | |
| 179 return; | |
| 180 } | |
| 181 | |
| 182 char device_type; | |
| 183 if (S_ISCHR(device_stat.st_mode)) { | |
| 184 device_type = 'c'; | |
| 185 } else if (S_ISBLK(device_stat.st_mode)) { | |
| 186 device_type = 'b'; | |
| 187 } else { | |
| 188 RecordGetDeviceInfoResult(false); | |
| 189 return; // Not a supported type. | |
| 190 } | |
| 191 | |
| 192 ScopedUdevDeviceObject device( | |
| 193 udev_device_new_from_devnum(udev_obj, device_type, device_stat.st_rdev)); | |
| 194 if (!device.get()) { | |
| 195 RecordGetDeviceInfoResult(false); | |
| 196 return; | |
| 197 } | |
| 198 | |
| 199 if (name) | |
| 200 *name = GetDeviceName(device); | |
| 201 | |
| 202 if (unique_id) | |
| 203 *unique_id = MakeDeviceUniqueId(device); | |
| 204 | |
| 205 if (removable) { | |
| 206 const char* value = udev_device_get_sysattr_value(device, | |
| 207 kRemovableSysAttr); | |
| 208 if (!value) { | |
| 209 // |parent_device| is owned by |device| and does not need to be cleaned | |
| 210 // up. | |
| 211 struct udev_device* parent_device = | |
| 212 udev_device_get_parent_with_subsystem_devtype(device, | |
| 213 kBlockSubsystemKey, | |
| 214 kDiskDeviceTypeKey); | |
| 215 value = udev_device_get_sysattr_value(parent_device, kRemovableSysAttr); | |
| 216 } | |
| 217 *removable = (value && atoi(value) == 1); | |
| 218 } | |
| 219 | |
| 220 if (partition_size_in_bytes) | |
| 221 *partition_size_in_bytes = GetDeviceStorageSize(device_path, device); | |
| 222 RecordGetDeviceInfoResult(true); | |
| 223 } | |
| 224 | |
| 225 } // namespace | |
| 226 | |
| 227 RemovableDeviceNotificationsLinux::RemovableDeviceNotificationsLinux( | |
| 228 const base::FilePath& path) | |
| 229 : initialized_(false), | |
| 230 mtab_path_(path), | |
| 231 get_device_info_func_(&GetDeviceInfo) { | |
| 232 } | |
| 233 | |
| 234 RemovableDeviceNotificationsLinux::RemovableDeviceNotificationsLinux( | |
| 235 const base::FilePath& path, | |
| 236 GetDeviceInfoFunc get_device_info_func) | |
| 237 : initialized_(false), | |
| 238 mtab_path_(path), | |
| 239 get_device_info_func_(get_device_info_func) { | |
| 240 } | |
| 241 | |
| 242 RemovableDeviceNotificationsLinux::~RemovableDeviceNotificationsLinux() { | |
| 243 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); | |
| 244 } | |
| 245 | |
| 246 void RemovableDeviceNotificationsLinux::Init() { | |
| 247 DCHECK(!mtab_path_.empty()); | |
| 248 | |
| 249 // Put |kKnownFileSystems| in std::set to get O(log N) access time. | |
| 250 for (size_t i = 0; i < arraysize(kKnownFileSystems); ++i) | |
| 251 known_file_systems_.insert(kKnownFileSystems[i]); | |
| 252 | |
| 253 BrowserThread::PostTask( | |
| 254 BrowserThread::FILE, FROM_HERE, | |
| 255 base::Bind(&RemovableDeviceNotificationsLinux::InitOnFileThread, this)); | |
| 256 } | |
| 257 | |
| 258 bool RemovableDeviceNotificationsLinux::GetStorageInfoForPath( | |
| 259 const base::FilePath& path, | |
| 260 StorageInfo* device_info) const { | |
| 261 if (!path.IsAbsolute()) | |
| 262 return false; | |
| 263 | |
| 264 base::FilePath current = path; | |
| 265 while (!ContainsKey(mount_info_map_, current) && current != current.DirName()) | |
| 266 current = current.DirName(); | |
| 267 | |
| 268 MountMap::const_iterator mount_info = mount_info_map_.find(current); | |
| 269 if (mount_info == mount_info_map_.end()) | |
| 270 return false; | |
| 271 | |
| 272 if (device_info) { | |
| 273 device_info->device_id = mount_info->second.device_id; | |
| 274 device_info->name = mount_info->second.device_name; | |
| 275 device_info->location = current.value(); | |
| 276 } | |
| 277 return true; | |
| 278 } | |
| 279 | |
| 280 uint64 RemovableDeviceNotificationsLinux::GetStorageSize( | |
| 281 const std::string& location) const { | |
| 282 MountMap::const_iterator mount_info = mount_info_map_.find( | |
| 283 base::FilePath(location)); | |
| 284 return (mount_info != mount_info_map_.end()) ? | |
| 285 mount_info->second.partition_size_in_bytes : 0; | |
| 286 } | |
| 287 | |
| 288 void RemovableDeviceNotificationsLinux::OnFilePathChanged( | |
| 289 const base::FilePath& path, | |
| 290 bool error) { | |
| 291 if (path != mtab_path_) { | |
| 292 // This cannot happen unless FilePathWatcher is buggy. Just ignore this | |
| 293 // notification and do nothing. | |
| 294 NOTREACHED(); | |
| 295 return; | |
| 296 } | |
| 297 if (error) { | |
| 298 LOG(ERROR) << "Error watching " << mtab_path_.value(); | |
| 299 return; | |
| 300 } | |
| 301 | |
| 302 UpdateMtab(); | |
| 303 } | |
| 304 | |
| 305 RemovableDeviceNotificationsLinux::MountPointInfo::MountPointInfo() | |
| 306 : partition_size_in_bytes(0) { | |
| 307 } | |
| 308 | |
| 309 void RemovableDeviceNotificationsLinux::InitOnFileThread() { | |
| 310 DCHECK(!initialized_); | |
| 311 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); | |
| 312 initialized_ = true; | |
| 313 | |
| 314 // The callback passed to Watch() has to be unretained. Otherwise | |
| 315 // RemovableDeviceNotificationsLinux will live longer than expected, and | |
| 316 // FilePathWatcher will get in trouble at shutdown time. | |
| 317 bool ret = file_watcher_.Watch( | |
| 318 mtab_path_, false, | |
| 319 base::Bind(&RemovableDeviceNotificationsLinux::OnFilePathChanged, | |
| 320 base::Unretained(this))); | |
| 321 if (!ret) { | |
| 322 LOG(ERROR) << "Adding watch for " << mtab_path_.value() << " failed"; | |
| 323 return; | |
| 324 } | |
| 325 | |
| 326 UpdateMtab(); | |
| 327 } | |
| 328 | |
| 329 void RemovableDeviceNotificationsLinux::UpdateMtab() { | |
| 330 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); | |
| 331 | |
| 332 MountPointDeviceMap new_mtab; | |
| 333 ReadMtab(mtab_path_, known_file_systems_, &new_mtab); | |
| 334 | |
| 335 // Check existing mtab entries for unaccounted mount points. | |
| 336 // These mount points must have been removed in the new mtab. | |
| 337 std::list<base::FilePath> mount_points_to_erase; | |
| 338 std::list<base::FilePath> multiple_mounted_devices_needing_reattachment; | |
| 339 for (MountMap::const_iterator old_iter = mount_info_map_.begin(); | |
| 340 old_iter != mount_info_map_.end(); ++old_iter) { | |
| 341 const base::FilePath& mount_point = old_iter->first; | |
| 342 const base::FilePath& mount_device = old_iter->second.mount_device; | |
| 343 MountPointDeviceMap::iterator new_iter = new_mtab.find(mount_point); | |
| 344 // |mount_point| not in |new_mtab| or |mount_device| is no longer mounted at | |
| 345 // |mount_point|. | |
| 346 if (new_iter == new_mtab.end() || (new_iter->second != mount_device)) { | |
| 347 MountPriorityMap::iterator priority = | |
| 348 mount_priority_map_.find(mount_device); | |
| 349 DCHECK(priority != mount_priority_map_.end()); | |
| 350 ReferencedMountPoint::const_iterator has_priority = | |
| 351 priority->second.find(mount_point); | |
| 352 if (MediaStorageUtil::IsRemovableDevice(old_iter->second.device_id)) { | |
| 353 DCHECK(has_priority != priority->second.end()); | |
| 354 if (has_priority->second) { | |
| 355 receiver()->ProcessDetach(old_iter->second.device_id); | |
| 356 } | |
| 357 if (priority->second.size() > 1) | |
| 358 multiple_mounted_devices_needing_reattachment.push_back(mount_device); | |
| 359 } | |
| 360 priority->second.erase(mount_point); | |
| 361 if (priority->second.empty()) | |
| 362 mount_priority_map_.erase(mount_device); | |
| 363 mount_points_to_erase.push_back(mount_point); | |
| 364 } | |
| 365 } | |
| 366 | |
| 367 // Erase the |mount_info_map_| entries afterwards. Erasing in the loop above | |
| 368 // using the iterator is slightly more efficient, but more tricky, since | |
| 369 // calling std::map::erase() on an iterator invalidates it. | |
| 370 for (std::list<base::FilePath>::const_iterator it = | |
| 371 mount_points_to_erase.begin(); | |
| 372 it != mount_points_to_erase.end(); | |
| 373 ++it) { | |
| 374 mount_info_map_.erase(*it); | |
| 375 } | |
| 376 | |
| 377 // For any multiply mounted device where the mount that we had notified | |
| 378 // got detached, send a notification of attachment for one of the other | |
| 379 // mount points. | |
| 380 for (std::list<base::FilePath>::const_iterator it = | |
| 381 multiple_mounted_devices_needing_reattachment.begin(); | |
| 382 it != multiple_mounted_devices_needing_reattachment.end(); | |
| 383 ++it) { | |
| 384 ReferencedMountPoint::iterator first_mount_point_info = | |
| 385 mount_priority_map_.find(*it)->second.begin(); | |
| 386 const base::FilePath& mount_point = first_mount_point_info->first; | |
| 387 first_mount_point_info->second = true; | |
| 388 | |
| 389 const MountPointInfo& mount_info = | |
| 390 mount_info_map_.find(mount_point)->second; | |
| 391 DCHECK(MediaStorageUtil::IsRemovableDevice(mount_info.device_id)); | |
| 392 receiver()->ProcessAttach(StorageInfo( | |
| 393 mount_info.device_id, mount_info.device_name, mount_point.value())); | |
| 394 } | |
| 395 | |
| 396 // Check new mtab entries against existing ones. | |
| 397 for (MountPointDeviceMap::iterator new_iter = new_mtab.begin(); | |
| 398 new_iter != new_mtab.end(); ++new_iter) { | |
| 399 const base::FilePath& mount_point = new_iter->first; | |
| 400 const base::FilePath& mount_device = new_iter->second; | |
| 401 MountMap::iterator old_iter = mount_info_map_.find(mount_point); | |
| 402 if (old_iter == mount_info_map_.end() || | |
| 403 old_iter->second.mount_device != mount_device) { | |
| 404 // New mount point found or an existing mount point found with a new | |
| 405 // device. | |
| 406 AddNewMount(mount_device, mount_point); | |
| 407 } | |
| 408 } | |
| 409 } | |
| 410 | |
| 411 void RemovableDeviceNotificationsLinux::AddNewMount( | |
| 412 const base::FilePath& mount_device, const base::FilePath& mount_point) { | |
| 413 MountPriorityMap::iterator priority = | |
| 414 mount_priority_map_.find(mount_device); | |
| 415 if (priority != mount_priority_map_.end()) { | |
| 416 const base::FilePath& other_mount_point = priority->second.begin()->first; | |
| 417 priority->second[mount_point] = false; | |
| 418 mount_info_map_[mount_point] = | |
| 419 mount_info_map_.find(other_mount_point)->second; | |
| 420 return; | |
| 421 } | |
| 422 | |
| 423 std::string unique_id; | |
| 424 string16 name; | |
| 425 bool removable; | |
| 426 uint64 partition_size_in_bytes; | |
| 427 get_device_info_func_(mount_device, &unique_id, &name, &removable, | |
| 428 &partition_size_in_bytes); | |
| 429 | |
| 430 // Keep track of device info details to see how often we get invalid values. | |
| 431 MediaStorageUtil::RecordDeviceInfoHistogram(true, unique_id, name); | |
| 432 if (unique_id.empty() || name.empty()) | |
| 433 return; | |
| 434 | |
| 435 bool has_dcim = IsMediaDevice(mount_point.value()); | |
| 436 MediaStorageUtil::Type type; | |
| 437 if (removable) { | |
| 438 if (has_dcim) { | |
| 439 type = MediaStorageUtil::REMOVABLE_MASS_STORAGE_WITH_DCIM; | |
| 440 } else { | |
| 441 type = MediaStorageUtil::REMOVABLE_MASS_STORAGE_NO_DCIM; | |
| 442 } | |
| 443 } else { | |
| 444 type = MediaStorageUtil::FIXED_MASS_STORAGE; | |
| 445 } | |
| 446 std::string device_id = MediaStorageUtil::MakeDeviceId(type, unique_id); | |
| 447 | |
| 448 MountPointInfo mount_point_info; | |
| 449 mount_point_info.mount_device = mount_device; | |
| 450 mount_point_info.device_id = device_id; | |
| 451 mount_point_info.device_name = name; | |
| 452 mount_point_info.partition_size_in_bytes = partition_size_in_bytes; | |
| 453 | |
| 454 mount_info_map_[mount_point] = mount_point_info; | |
| 455 mount_priority_map_[mount_device][mount_point] = removable; | |
| 456 | |
| 457 if (removable) { | |
| 458 receiver()->ProcessAttach(StorageInfo( | |
| 459 device_id, GetDisplayNameForDevice(partition_size_in_bytes, name), | |
| 460 mount_point.value())); | |
| 461 } | |
| 462 } | |
| 463 | |
| 464 } // namespace chrome | |
| OLD | NEW |
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Chromium Code Reviews
Issue 12382005:
Rename RemovableDeviceNotifications=>StorageMonitor (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master