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 <string.h> 20 #include <errno.h> 21 #include <fcntl.h> 22 #include <sys/stat.h> 23 #include <sys/types.h> 24 #include <sys/mount.h> 25 26 #include <linux/kdev_t.h> 27 28 #define LOG_TAG "Vold" 29 30 #include <openssl/md5.h> 31 32 #include <cutils/log.h> 33 34 #include <sysutils/NetlinkEvent.h> 35 36 #include "VolumeManager.h" 37 #include "DirectVolume.h" 38 #include "ResponseCode.h" 39 #include "Loop.h" 40 #include "Fat.h" 41 #include "Devmapper.h" 42 #include "Process.h" 43 #include "Asec.h" 44 45 VolumeManager *VolumeManager::sInstance = NULL; 46 47 VolumeManager *VolumeManager::Instance() { 48 if (!sInstance) 49 sInstance = new VolumeManager(); 50 return sInstance; 51 } 52 53 VolumeManager::VolumeManager() { 54 mDebug = false; 55 mVolumes = new VolumeCollection(); 56 mActiveContainers = new AsecIdCollection(); 57 mBroadcaster = NULL; 58 mUsbMassStorageEnabled = false; 59 mUsbConnected = false; 60 mUmsSharingCount = 0; 61 mSavedDirtyRatio = -1; 62 // set dirty ratio to 0 when UMS is active 63 mUmsDirtyRatio = 0; 64 65 readInitialState(); 66 } 67 68 void VolumeManager::readInitialState() { 69 FILE *fp; 70 char state[255]; 71 72 /* 73 * Read the initial mass storage enabled state 74 */ 75 if ((fp = fopen("/sys/devices/virtual/usb_composite/usb_mass_storage/enable", "r"))) { 76 if (fgets(state, sizeof(state), fp)) { 77 mUsbMassStorageEnabled = !strncmp(state, "1", 1); 78 } else { 79 SLOGE("Failed to read usb_mass_storage enabled state (%s)", strerror(errno)); 80 } 81 fclose(fp); 82 } else { 83 SLOGD("USB mass storage support is not enabled in the kernel"); 84 } 85 86 /* 87 * Read the initial USB connected state 88 */ 89 if ((fp = fopen("/sys/devices/virtual/switch/usb_configuration/state", "r"))) { 90 if (fgets(state, sizeof(state), fp)) { 91 mUsbConnected = !strncmp(state, "1", 1); 92 } else { 93 SLOGE("Failed to read usb_configuration switch (%s)", strerror(errno)); 94 } 95 fclose(fp); 96 } else { 97 SLOGD("usb_configuration switch is not enabled in the kernel"); 98 } 99 } 100 101 VolumeManager::~VolumeManager() { 102 delete mVolumes; 103 delete mActiveContainers; 104 } 105 106 char *VolumeManager::asecHash(const char *id, char *buffer, size_t len) { 107 static const char* digits = "0123456789abcdef"; 108 109 unsigned char sig[MD5_DIGEST_LENGTH]; 110 111 if (buffer == NULL) { 112 SLOGE("Destination buffer is NULL"); 113 errno = ESPIPE; 114 return NULL; 115 } else if (id == NULL) { 116 SLOGE("Source buffer is NULL"); 117 errno = ESPIPE; 118 return NULL; 119 } else if (len < MD5_ASCII_LENGTH_PLUS_NULL) { 120 SLOGE("Target hash buffer size < %d bytes (%d)", 121 MD5_ASCII_LENGTH_PLUS_NULL, len); 122 errno = ESPIPE; 123 return NULL; 124 } 125 126 MD5(reinterpret_cast<const unsigned char*>(id), strlen(id), sig); 127 128 char *p = buffer; 129 for (int i = 0; i < MD5_DIGEST_LENGTH; i++) { 130 *p++ = digits[sig[i] >> 4]; 131 *p++ = digits[sig[i] & 0x0F]; 132 } 133 *p = '\0'; 134 135 return buffer; 136 } 137 138 void VolumeManager::setDebug(bool enable) { 139 mDebug = enable; 140 VolumeCollection::iterator it; 141 for (it = mVolumes->begin(); it != mVolumes->end(); ++it) { 142 (*it)->setDebug(enable); 143 } 144 } 145 146 int VolumeManager::start() { 147 return 0; 148 } 149 150 int VolumeManager::stop() { 151 return 0; 152 } 153 154 int VolumeManager::addVolume(Volume *v) { 155 mVolumes->push_back(v); 156 return 0; 157 } 158 159 void VolumeManager::notifyUmsAvailable(bool available) { 160 char msg[255]; 161 162 snprintf(msg, sizeof(msg), "Share method ums now %s", 163 (available ? "available" : "unavailable")); 164 SLOGD(msg); 165 getBroadcaster()->sendBroadcast(ResponseCode::ShareAvailabilityChange, 166 msg, false); 167 } 168 169 void VolumeManager::handleSwitchEvent(NetlinkEvent *evt) { 170 const char *devpath = evt->findParam("DEVPATH"); 171 const char *name = evt->findParam("SWITCH_NAME"); 172 const char *state = evt->findParam("SWITCH_STATE"); 173 174 if (!name || !state) { 175 SLOGW("Switch %s event missing name/state info", devpath); 176 return; 177 } 178 179 bool oldAvailable = massStorageAvailable(); 180 if (!strcmp(name, "usb_configuration")) { 181 mUsbConnected = !strcmp(state, "1"); 182 SLOGD("USB %s", mUsbConnected ? "connected" : "disconnected"); 183 bool newAvailable = massStorageAvailable(); 184 if (newAvailable != oldAvailable) { 185 notifyUmsAvailable(newAvailable); 186 } 187 } else { 188 SLOGW("Ignoring unknown switch '%s'", name); 189 } 190 } 191 void VolumeManager::handleUsbCompositeEvent(NetlinkEvent *evt) { 192 const char *function = evt->findParam("FUNCTION"); 193 const char *enabled = evt->findParam("ENABLED"); 194 195 if (!function || !enabled) { 196 SLOGW("usb_composite event missing function/enabled info"); 197 return; 198 } 199 200 if (!strcmp(function, "usb_mass_storage")) { 201 bool oldAvailable = massStorageAvailable(); 202 mUsbMassStorageEnabled = !strcmp(enabled, "1"); 203 SLOGD("usb_mass_storage function %s", mUsbMassStorageEnabled ? "enabled" : "disabled"); 204 bool newAvailable = massStorageAvailable(); 205 if (newAvailable != oldAvailable) { 206 notifyUmsAvailable(newAvailable); 207 } 208 } 209 } 210 211 void VolumeManager::handleBlockEvent(NetlinkEvent *evt) { 212 const char *devpath = evt->findParam("DEVPATH"); 213 214 /* Lookup a volume to handle this device */ 215 VolumeCollection::iterator it; 216 bool hit = false; 217 for (it = mVolumes->begin(); it != mVolumes->end(); ++it) { 218 if (!(*it)->handleBlockEvent(evt)) { 219 #ifdef NETLINK_DEBUG 220 SLOGD("Device '%s' event handled by volume %s\n", devpath, (*it)->getLabel()); 221 #endif 222 hit = true; 223 break; 224 } 225 } 226 227 if (!hit) { 228 #ifdef NETLINK_DEBUG 229 SLOGW("No volumes handled block event for '%s'", devpath); 230 #endif 231 } 232 } 233 234 int VolumeManager::listVolumes(SocketClient *cli) { 235 VolumeCollection::iterator i; 236 237 for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { 238 char *buffer; 239 asprintf(&buffer, "%s %s %d", 240 (*i)->getLabel(), (*i)->getMountpoint(), 241 (*i)->getState()); 242 cli->sendMsg(ResponseCode::VolumeListResult, buffer, false); 243 free(buffer); 244 } 245 cli->sendMsg(ResponseCode::CommandOkay, "Volumes listed.", false); 246 return 0; 247 } 248 249 int VolumeManager::formatVolume(const char *label) { 250 Volume *v = lookupVolume(label); 251 252 if (!v) { 253 errno = ENOENT; 254 return -1; 255 } 256 257 return v->formatVol(); 258 } 259 260 int VolumeManager::getObbMountPath(const char *sourceFile, char *mountPath, int mountPathLen) { 261 char idHash[33]; 262 if (!asecHash(sourceFile, idHash, sizeof(idHash))) { 263 SLOGE("Hash of '%s' failed (%s)", sourceFile, strerror(errno)); 264 return -1; 265 } 266 267 memset(mountPath, 0, mountPathLen); 268 snprintf(mountPath, mountPathLen, "%s/%s", Volume::LOOPDIR, idHash); 269 270 if (access(mountPath, F_OK)) { 271 errno = ENOENT; 272 return -1; 273 } 274 275 return 0; 276 } 277 278 int VolumeManager::getAsecMountPath(const char *id, char *buffer, int maxlen) { 279 char asecFileName[255]; 280 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 281 282 memset(buffer, 0, maxlen); 283 if (access(asecFileName, F_OK)) { 284 errno = ENOENT; 285 return -1; 286 } 287 288 snprintf(buffer, maxlen, "%s/%s", Volume::ASECDIR, id); 289 return 0; 290 } 291 292 int VolumeManager::createAsec(const char *id, unsigned int numSectors, 293 const char *fstype, const char *key, int ownerUid) { 294 struct asec_superblock sb; 295 memset(&sb, 0, sizeof(sb)); 296 297 sb.magic = ASEC_SB_MAGIC; 298 sb.ver = ASEC_SB_VER; 299 300 if (numSectors < ((1024*1024)/512)) { 301 SLOGE("Invalid container size specified (%d sectors)", numSectors); 302 errno = EINVAL; 303 return -1; 304 } 305 306 if (lookupVolume(id)) { 307 SLOGE("ASEC id '%s' currently exists", id); 308 errno = EADDRINUSE; 309 return -1; 310 } 311 312 char asecFileName[255]; 313 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 314 315 if (!access(asecFileName, F_OK)) { 316 SLOGE("ASEC file '%s' currently exists - destroy it first! (%s)", 317 asecFileName, strerror(errno)); 318 errno = EADDRINUSE; 319 return -1; 320 } 321 322 /* 323 * Add some headroom 324 */ 325 unsigned fatSize = (((numSectors * 4) / 512) + 1) * 2; 326 unsigned numImgSectors = numSectors + fatSize + 2; 327 328 if (numImgSectors % 63) { 329 numImgSectors += (63 - (numImgSectors % 63)); 330 } 331 332 // Add +1 for our superblock which is at the end 333 if (Loop::createImageFile(asecFileName, numImgSectors + 1)) { 334 SLOGE("ASEC image file creation failed (%s)", strerror(errno)); 335 return -1; 336 } 337 338 char idHash[33]; 339 if (!asecHash(id, idHash, sizeof(idHash))) { 340 SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 341 unlink(asecFileName); 342 return -1; 343 } 344 345 char loopDevice[255]; 346 if (Loop::create(idHash, asecFileName, loopDevice, sizeof(loopDevice))) { 347 SLOGE("ASEC loop device creation failed (%s)", strerror(errno)); 348 unlink(asecFileName); 349 return -1; 350 } 351 352 char dmDevice[255]; 353 bool cleanupDm = false; 354 355 if (strcmp(key, "none")) { 356 // XXX: This is all we support for now 357 sb.c_cipher = ASEC_SB_C_CIPHER_TWOFISH; 358 if (Devmapper::create(idHash, loopDevice, key, numImgSectors, dmDevice, 359 sizeof(dmDevice))) { 360 SLOGE("ASEC device mapping failed (%s)", strerror(errno)); 361 Loop::destroyByDevice(loopDevice); 362 unlink(asecFileName); 363 return -1; 364 } 365 cleanupDm = true; 366 } else { 367 sb.c_cipher = ASEC_SB_C_CIPHER_NONE; 368 strcpy(dmDevice, loopDevice); 369 } 370 371 /* 372 * Drop down the superblock at the end of the file 373 */ 374 375 int sbfd = open(loopDevice, O_RDWR); 376 if (sbfd < 0) { 377 SLOGE("Failed to open new DM device for superblock write (%s)", strerror(errno)); 378 if (cleanupDm) { 379 Devmapper::destroy(idHash); 380 } 381 Loop::destroyByDevice(loopDevice); 382 unlink(asecFileName); 383 return -1; 384 } 385 386 if (lseek(sbfd, (numImgSectors * 512), SEEK_SET) < 0) { 387 close(sbfd); 388 SLOGE("Failed to lseek for superblock (%s)", strerror(errno)); 389 if (cleanupDm) { 390 Devmapper::destroy(idHash); 391 } 392 Loop::destroyByDevice(loopDevice); 393 unlink(asecFileName); 394 return -1; 395 } 396 397 if (write(sbfd, &sb, sizeof(sb)) != sizeof(sb)) { 398 close(sbfd); 399 SLOGE("Failed to write superblock (%s)", strerror(errno)); 400 if (cleanupDm) { 401 Devmapper::destroy(idHash); 402 } 403 Loop::destroyByDevice(loopDevice); 404 unlink(asecFileName); 405 return -1; 406 } 407 close(sbfd); 408 409 if (strcmp(fstype, "none")) { 410 if (strcmp(fstype, "fat")) { 411 SLOGW("Unknown fstype '%s' specified for container", fstype); 412 } 413 414 if (Fat::format(dmDevice, numImgSectors)) { 415 SLOGE("ASEC FAT format failed (%s)", strerror(errno)); 416 if (cleanupDm) { 417 Devmapper::destroy(idHash); 418 } 419 Loop::destroyByDevice(loopDevice); 420 unlink(asecFileName); 421 return -1; 422 } 423 char mountPoint[255]; 424 425 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 426 if (mkdir(mountPoint, 0777)) { 427 if (errno != EEXIST) { 428 SLOGE("Mountpoint creation failed (%s)", strerror(errno)); 429 if (cleanupDm) { 430 Devmapper::destroy(idHash); 431 } 432 Loop::destroyByDevice(loopDevice); 433 unlink(asecFileName); 434 return -1; 435 } 436 } 437 438 if (Fat::doMount(dmDevice, mountPoint, false, false, false, ownerUid, 439 0, 0000, false)) { 440 SLOGE("ASEC FAT mount failed (%s)", strerror(errno)); 441 if (cleanupDm) { 442 Devmapper::destroy(idHash); 443 } 444 Loop::destroyByDevice(loopDevice); 445 unlink(asecFileName); 446 return -1; 447 } 448 } else { 449 SLOGI("Created raw secure container %s (no filesystem)", id); 450 } 451 452 mActiveContainers->push_back(new ContainerData(strdup(id), ASEC)); 453 return 0; 454 } 455 456 int VolumeManager::finalizeAsec(const char *id) { 457 char asecFileName[255]; 458 char loopDevice[255]; 459 char mountPoint[255]; 460 461 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 462 463 char idHash[33]; 464 if (!asecHash(id, idHash, sizeof(idHash))) { 465 SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 466 return -1; 467 } 468 469 if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 470 SLOGE("Unable to finalize %s (%s)", id, strerror(errno)); 471 return -1; 472 } 473 474 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 475 // XXX: 476 if (Fat::doMount(loopDevice, mountPoint, true, true, true, 0, 0, 0227, false)) { 477 SLOGE("ASEC finalize mount failed (%s)", strerror(errno)); 478 return -1; 479 } 480 481 if (mDebug) { 482 SLOGD("ASEC %s finalized", id); 483 } 484 return 0; 485 } 486 487 int VolumeManager::renameAsec(const char *id1, const char *id2) { 488 char *asecFilename1; 489 char *asecFilename2; 490 char mountPoint[255]; 491 492 asprintf(&asecFilename1, "%s/%s.asec", Volume::SEC_ASECDIR, id1); 493 asprintf(&asecFilename2, "%s/%s.asec", Volume::SEC_ASECDIR, id2); 494 495 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id1); 496 if (isMountpointMounted(mountPoint)) { 497 SLOGW("Rename attempt when src mounted"); 498 errno = EBUSY; 499 goto out_err; 500 } 501 502 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id2); 503 if (isMountpointMounted(mountPoint)) { 504 SLOGW("Rename attempt when dst mounted"); 505 errno = EBUSY; 506 goto out_err; 507 } 508 509 if (!access(asecFilename2, F_OK)) { 510 SLOGE("Rename attempt when dst exists"); 511 errno = EADDRINUSE; 512 goto out_err; 513 } 514 515 if (rename(asecFilename1, asecFilename2)) { 516 SLOGE("Rename of '%s' to '%s' failed (%s)", asecFilename1, asecFilename2, strerror(errno)); 517 goto out_err; 518 } 519 520 free(asecFilename1); 521 free(asecFilename2); 522 return 0; 523 524 out_err: 525 free(asecFilename1); 526 free(asecFilename2); 527 return -1; 528 } 529 530 #define UNMOUNT_RETRIES 5 531 #define UNMOUNT_SLEEP_BETWEEN_RETRY_MS (1000 * 1000) 532 int VolumeManager::unmountAsec(const char *id, bool force) { 533 char asecFileName[255]; 534 char mountPoint[255]; 535 536 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 537 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 538 539 char idHash[33]; 540 if (!asecHash(id, idHash, sizeof(idHash))) { 541 SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 542 return -1; 543 } 544 545 return unmountLoopImage(id, idHash, asecFileName, mountPoint, force); 546 } 547 548 int VolumeManager::unmountObb(const char *fileName, bool force) { 549 char mountPoint[255]; 550 551 char idHash[33]; 552 if (!asecHash(fileName, idHash, sizeof(idHash))) { 553 SLOGE("Hash of '%s' failed (%s)", fileName, strerror(errno)); 554 return -1; 555 } 556 557 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::LOOPDIR, idHash); 558 559 return unmountLoopImage(fileName, idHash, fileName, mountPoint, force); 560 } 561 562 int VolumeManager::unmountLoopImage(const char *id, const char *idHash, 563 const char *fileName, const char *mountPoint, bool force) { 564 if (!isMountpointMounted(mountPoint)) { 565 SLOGE("Unmount request for %s when not mounted", id); 566 errno = ENOENT; 567 return -1; 568 } 569 570 int i, rc; 571 for (i = 1; i <= UNMOUNT_RETRIES; i++) { 572 rc = umount(mountPoint); 573 if (!rc) { 574 break; 575 } 576 if (rc && (errno == EINVAL || errno == ENOENT)) { 577 SLOGI("Container %s unmounted OK", id); 578 rc = 0; 579 break; 580 } 581 SLOGW("%s unmount attempt %d failed (%s)", 582 id, i, strerror(errno)); 583 584 int action = 0; // default is to just complain 585 586 if (force) { 587 if (i > (UNMOUNT_RETRIES - 2)) 588 action = 2; // SIGKILL 589 else if (i > (UNMOUNT_RETRIES - 3)) 590 action = 1; // SIGHUP 591 } 592 593 Process::killProcessesWithOpenFiles(mountPoint, action); 594 usleep(UNMOUNT_SLEEP_BETWEEN_RETRY_MS); 595 } 596 597 if (rc) { 598 errno = EBUSY; 599 SLOGE("Failed to unmount container %s (%s)", id, strerror(errno)); 600 return -1; 601 } 602 603 int retries = 10; 604 605 while(retries--) { 606 if (!rmdir(mountPoint)) { 607 break; 608 } 609 610 SLOGW("Failed to rmdir %s (%s)", mountPoint, strerror(errno)); 611 usleep(UNMOUNT_SLEEP_BETWEEN_RETRY_MS); 612 } 613 614 if (!retries) { 615 SLOGE("Timed out trying to rmdir %s (%s)", mountPoint, strerror(errno)); 616 } 617 618 if (Devmapper::destroy(idHash) && errno != ENXIO) { 619 SLOGE("Failed to destroy devmapper instance (%s)", strerror(errno)); 620 } 621 622 char loopDevice[255]; 623 if (!Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 624 Loop::destroyByDevice(loopDevice); 625 } else { 626 SLOGW("Failed to find loop device for {%s} (%s)", fileName, strerror(errno)); 627 } 628 629 AsecIdCollection::iterator it; 630 for (it = mActiveContainers->begin(); it != mActiveContainers->end(); ++it) { 631 ContainerData* cd = *it; 632 if (!strcmp(cd->id, id)) { 633 free(*it); 634 mActiveContainers->erase(it); 635 break; 636 } 637 } 638 if (it == mActiveContainers->end()) { 639 SLOGW("mActiveContainers is inconsistent!"); 640 } 641 return 0; 642 } 643 644 int VolumeManager::destroyAsec(const char *id, bool force) { 645 char asecFileName[255]; 646 char mountPoint[255]; 647 648 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 649 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 650 651 if (isMountpointMounted(mountPoint)) { 652 if (mDebug) { 653 SLOGD("Unmounting container before destroy"); 654 } 655 if (unmountAsec(id, force)) { 656 SLOGE("Failed to unmount asec %s for destroy (%s)", id, strerror(errno)); 657 return -1; 658 } 659 } 660 661 if (unlink(asecFileName)) { 662 SLOGE("Failed to unlink asec '%s' (%s)", asecFileName, strerror(errno)); 663 return -1; 664 } 665 666 if (mDebug) { 667 SLOGD("ASEC %s destroyed", id); 668 } 669 return 0; 670 } 671 672 int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) { 673 char asecFileName[255]; 674 char mountPoint[255]; 675 676 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 677 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 678 679 if (isMountpointMounted(mountPoint)) { 680 SLOGE("ASEC %s already mounted", id); 681 errno = EBUSY; 682 return -1; 683 } 684 685 char idHash[33]; 686 if (!asecHash(id, idHash, sizeof(idHash))) { 687 SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 688 return -1; 689 } 690 691 char loopDevice[255]; 692 if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 693 if (Loop::create(idHash, asecFileName, loopDevice, sizeof(loopDevice))) { 694 SLOGE("ASEC loop device creation failed (%s)", strerror(errno)); 695 return -1; 696 } 697 if (mDebug) { 698 SLOGD("New loop device created at %s", loopDevice); 699 } 700 } else { 701 if (mDebug) { 702 SLOGD("Found active loopback for %s at %s", asecFileName, loopDevice); 703 } 704 } 705 706 char dmDevice[255]; 707 bool cleanupDm = false; 708 int fd; 709 unsigned int nr_sec = 0; 710 711 if ((fd = open(loopDevice, O_RDWR)) < 0) { 712 SLOGE("Failed to open loopdevice (%s)", strerror(errno)); 713 Loop::destroyByDevice(loopDevice); 714 return -1; 715 } 716 717 if (ioctl(fd, BLKGETSIZE, &nr_sec)) { 718 SLOGE("Failed to get loop size (%s)", strerror(errno)); 719 Loop::destroyByDevice(loopDevice); 720 close(fd); 721 return -1; 722 } 723 724 /* 725 * Validate superblock 726 */ 727 struct asec_superblock sb; 728 memset(&sb, 0, sizeof(sb)); 729 if (lseek(fd, ((nr_sec-1) * 512), SEEK_SET) < 0) { 730 SLOGE("lseek failed (%s)", strerror(errno)); 731 close(fd); 732 Loop::destroyByDevice(loopDevice); 733 return -1; 734 } 735 if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) { 736 SLOGE("superblock read failed (%s)", strerror(errno)); 737 close(fd); 738 Loop::destroyByDevice(loopDevice); 739 return -1; 740 } 741 742 close(fd); 743 744 if (mDebug) { 745 SLOGD("Container sb magic/ver (%.8x/%.2x)", sb.magic, sb.ver); 746 } 747 if (sb.magic != ASEC_SB_MAGIC || sb.ver != ASEC_SB_VER) { 748 SLOGE("Bad container magic/version (%.8x/%.2x)", sb.magic, sb.ver); 749 Loop::destroyByDevice(loopDevice); 750 errno = EMEDIUMTYPE; 751 return -1; 752 } 753 nr_sec--; // We don't want the devmapping to extend onto our superblock 754 755 if (strcmp(key, "none")) { 756 if (Devmapper::lookupActive(idHash, dmDevice, sizeof(dmDevice))) { 757 if (Devmapper::create(idHash, loopDevice, key, nr_sec, 758 dmDevice, sizeof(dmDevice))) { 759 SLOGE("ASEC device mapping failed (%s)", strerror(errno)); 760 Loop::destroyByDevice(loopDevice); 761 return -1; 762 } 763 if (mDebug) { 764 SLOGD("New devmapper instance created at %s", dmDevice); 765 } 766 } else { 767 if (mDebug) { 768 SLOGD("Found active devmapper for %s at %s", asecFileName, dmDevice); 769 } 770 } 771 cleanupDm = true; 772 } else { 773 strcpy(dmDevice, loopDevice); 774 } 775 776 if (mkdir(mountPoint, 0777)) { 777 if (errno != EEXIST) { 778 SLOGE("Mountpoint creation failed (%s)", strerror(errno)); 779 if (cleanupDm) { 780 Devmapper::destroy(idHash); 781 } 782 Loop::destroyByDevice(loopDevice); 783 return -1; 784 } 785 } 786 787 if (Fat::doMount(dmDevice, mountPoint, true, false, true, ownerUid, 0, 788 0222, false)) { 789 // 0227, false)) { 790 SLOGE("ASEC mount failed (%s)", strerror(errno)); 791 if (cleanupDm) { 792 Devmapper::destroy(idHash); 793 } 794 Loop::destroyByDevice(loopDevice); 795 return -1; 796 } 797 798 mActiveContainers->push_back(new ContainerData(strdup(id), ASEC)); 799 if (mDebug) { 800 SLOGD("ASEC %s mounted", id); 801 } 802 return 0; 803 } 804 805 /** 806 * Mounts an image file <code>img</code>. 807 */ 808 int VolumeManager::mountObb(const char *img, const char *key, int ownerUid) { 809 char mountPoint[255]; 810 811 char idHash[33]; 812 if (!asecHash(img, idHash, sizeof(idHash))) { 813 SLOGE("Hash of '%s' failed (%s)", img, strerror(errno)); 814 return -1; 815 } 816 817 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::LOOPDIR, idHash); 818 819 if (isMountpointMounted(mountPoint)) { 820 SLOGE("Image %s already mounted", img); 821 errno = EBUSY; 822 return -1; 823 } 824 825 char loopDevice[255]; 826 if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 827 if (Loop::create(idHash, img, loopDevice, sizeof(loopDevice))) { 828 SLOGE("Image loop device creation failed (%s)", strerror(errno)); 829 return -1; 830 } 831 if (mDebug) { 832 SLOGD("New loop device created at %s", loopDevice); 833 } 834 } else { 835 if (mDebug) { 836 SLOGD("Found active loopback for %s at %s", img, loopDevice); 837 } 838 } 839 840 char dmDevice[255]; 841 bool cleanupDm = false; 842 int fd; 843 unsigned int nr_sec = 0; 844 845 if ((fd = open(loopDevice, O_RDWR)) < 0) { 846 SLOGE("Failed to open loopdevice (%s)", strerror(errno)); 847 Loop::destroyByDevice(loopDevice); 848 return -1; 849 } 850 851 if (ioctl(fd, BLKGETSIZE, &nr_sec)) { 852 SLOGE("Failed to get loop size (%s)", strerror(errno)); 853 Loop::destroyByDevice(loopDevice); 854 close(fd); 855 return -1; 856 } 857 858 close(fd); 859 860 if (strcmp(key, "none")) { 861 if (Devmapper::lookupActive(idHash, dmDevice, sizeof(dmDevice))) { 862 if (Devmapper::create(idHash, loopDevice, key, nr_sec, 863 dmDevice, sizeof(dmDevice))) { 864 SLOGE("ASEC device mapping failed (%s)", strerror(errno)); 865 Loop::destroyByDevice(loopDevice); 866 return -1; 867 } 868 if (mDebug) { 869 SLOGD("New devmapper instance created at %s", dmDevice); 870 } 871 } else { 872 if (mDebug) { 873 SLOGD("Found active devmapper for %s at %s", img, dmDevice); 874 } 875 } 876 cleanupDm = true; 877 } else { 878 strcpy(dmDevice, loopDevice); 879 } 880 881 if (mkdir(mountPoint, 0755)) { 882 if (errno != EEXIST) { 883 SLOGE("Mountpoint creation failed (%s)", strerror(errno)); 884 if (cleanupDm) { 885 Devmapper::destroy(idHash); 886 } 887 Loop::destroyByDevice(loopDevice); 888 return -1; 889 } 890 } 891 892 if (Fat::doMount(dmDevice, mountPoint, true, false, true, ownerUid, 0, 893 0227, false)) { 894 SLOGE("Image mount failed (%s)", strerror(errno)); 895 if (cleanupDm) { 896 Devmapper::destroy(idHash); 897 } 898 Loop::destroyByDevice(loopDevice); 899 return -1; 900 } 901 902 mActiveContainers->push_back(new ContainerData(strdup(img), OBB)); 903 if (mDebug) { 904 SLOGD("Image %s mounted", img); 905 } 906 return 0; 907 } 908 909 int VolumeManager::mountVolume(const char *label) { 910 Volume *v = lookupVolume(label); 911 912 if (!v) { 913 errno = ENOENT; 914 return -1; 915 } 916 917 return v->mountVol(); 918 } 919 920 int VolumeManager::listMountedObbs(SocketClient* cli) { 921 char device[256]; 922 char mount_path[256]; 923 char rest[256]; 924 FILE *fp; 925 char line[1024]; 926 927 if (!(fp = fopen("/proc/mounts", "r"))) { 928 SLOGE("Error opening /proc/mounts (%s)", strerror(errno)); 929 return -1; 930 } 931 932 // Create a string to compare against that has a trailing slash 933 int loopDirLen = sizeof(Volume::LOOPDIR); 934 char loopDir[loopDirLen + 2]; 935 strcpy(loopDir, Volume::LOOPDIR); 936 loopDir[loopDirLen++] = '/'; 937 loopDir[loopDirLen] = '\0'; 938 939 while(fgets(line, sizeof(line), fp)) { 940 line[strlen(line)-1] = '\0'; 941 942 /* 943 * Should look like: 944 * /dev/block/loop0 /mnt/obb/fc99df1323fd36424f864dcb76b76d65 ... 945 */ 946 sscanf(line, "%255s %255s %255s\n", device, mount_path, rest); 947 948 if (!strncmp(mount_path, loopDir, loopDirLen)) { 949 int fd = open(device, O_RDONLY); 950 if (fd >= 0) { 951 struct loop_info64 li; 952 if (ioctl(fd, LOOP_GET_STATUS64, &li) >= 0) { 953 cli->sendMsg(ResponseCode::AsecListResult, 954 (const char*) li.lo_file_name, false); 955 } 956 close(fd); 957 } 958 } 959 } 960 961 fclose(fp); 962 return 0; 963 } 964 965 int VolumeManager::shareAvailable(const char *method, bool *avail) { 966 967 if (strcmp(method, "ums")) { 968 errno = ENOSYS; 969 return -1; 970 } 971 972 *avail = massStorageAvailable(); 973 return 0; 974 } 975 976 int VolumeManager::shareEnabled(const char *label, const char *method, bool *enabled) { 977 Volume *v = lookupVolume(label); 978 979 if (!v) { 980 errno = ENOENT; 981 return -1; 982 } 983 984 if (strcmp(method, "ums")) { 985 errno = ENOSYS; 986 return -1; 987 } 988 989 if (v->getState() != Volume::State_Shared) { 990 *enabled = false; 991 } else { 992 *enabled = true; 993 } 994 return 0; 995 } 996 997 int VolumeManager::simulate(const char *cmd, const char *arg) { 998 999 if (!strcmp(cmd, "ums")) { 1000 if (!strcmp(arg, "connect")) { 1001 notifyUmsAvailable(true); 1002 } else if (!strcmp(arg, "disconnect")) { 1003 notifyUmsAvailable(false); 1004 } else { 1005 errno = EINVAL; 1006 return -1; 1007 } 1008 } else { 1009 errno = EINVAL; 1010 return -1; 1011 } 1012 return 0; 1013 } 1014 1015 int VolumeManager::shareVolume(const char *label, const char *method) { 1016 Volume *v = lookupVolume(label); 1017 1018 if (!v) { 1019 errno = ENOENT; 1020 return -1; 1021 } 1022 1023 /* 1024 * Eventually, we'll want to support additional share back-ends, 1025 * some of which may work while the media is mounted. For now, 1026 * we just support UMS 1027 */ 1028 if (strcmp(method, "ums")) { 1029 errno = ENOSYS; 1030 return -1; 1031 } 1032 1033 if (v->getState() == Volume::State_NoMedia) { 1034 errno = ENODEV; 1035 return -1; 1036 } 1037 1038 if (v->getState() != Volume::State_Idle) { 1039 // You need to unmount manually befoe sharing 1040 errno = EBUSY; 1041 return -1; 1042 } 1043 1044 dev_t d = v->getShareDevice(); 1045 if ((MAJOR(d) == 0) && (MINOR(d) == 0)) { 1046 // This volume does not support raw disk access 1047 errno = EINVAL; 1048 return -1; 1049 } 1050 1051 int fd; 1052 char nodepath[255]; 1053 snprintf(nodepath, 1054 sizeof(nodepath), "/dev/block/vold/%d:%d", 1055 MAJOR(d), MINOR(d)); 1056 1057 if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", 1058 O_WRONLY)) < 0) { 1059 SLOGE("Unable to open ums lunfile (%s)", strerror(errno)); 1060 return -1; 1061 } 1062 1063 if (write(fd, nodepath, strlen(nodepath)) < 0) { 1064 SLOGE("Unable to write to ums lunfile (%s)", strerror(errno)); 1065 close(fd); 1066 return -1; 1067 } 1068 1069 close(fd); 1070 v->handleVolumeShared(); 1071 if (mUmsSharingCount++ == 0) { 1072 FILE* fp; 1073 mSavedDirtyRatio = -1; // in case we fail 1074 if ((fp = fopen("/proc/sys/vm/dirty_ratio", "r+"))) { 1075 char line[16]; 1076 if (fgets(line, sizeof(line), fp) && sscanf(line, "%d", &mSavedDirtyRatio)) { 1077 fprintf(fp, "%d\n", mUmsDirtyRatio); 1078 } else { 1079 SLOGE("Failed to read dirty_ratio (%s)", strerror(errno)); 1080 } 1081 fclose(fp); 1082 } else { 1083 SLOGE("Failed to open /proc/sys/vm/dirty_ratio (%s)", strerror(errno)); 1084 } 1085 } 1086 return 0; 1087 } 1088 1089 int VolumeManager::unshareVolume(const char *label, const char *method) { 1090 Volume *v = lookupVolume(label); 1091 1092 if (!v) { 1093 errno = ENOENT; 1094 return -1; 1095 } 1096 1097 if (strcmp(method, "ums")) { 1098 errno = ENOSYS; 1099 return -1; 1100 } 1101 1102 if (v->getState() != Volume::State_Shared) { 1103 errno = EINVAL; 1104 return -1; 1105 } 1106 1107 int fd; 1108 if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) { 1109 SLOGE("Unable to open ums lunfile (%s)", strerror(errno)); 1110 return -1; 1111 } 1112 1113 char ch = 0; 1114 if (write(fd, &ch, 1) < 0) { 1115 SLOGE("Unable to write to ums lunfile (%s)", strerror(errno)); 1116 close(fd); 1117 return -1; 1118 } 1119 1120 close(fd); 1121 v->handleVolumeUnshared(); 1122 if (--mUmsSharingCount == 0 && mSavedDirtyRatio != -1) { 1123 FILE* fp; 1124 if ((fp = fopen("/proc/sys/vm/dirty_ratio", "r+"))) { 1125 fprintf(fp, "%d\n", mSavedDirtyRatio); 1126 fclose(fp); 1127 } else { 1128 SLOGE("Failed to open /proc/sys/vm/dirty_ratio (%s)", strerror(errno)); 1129 } 1130 mSavedDirtyRatio = -1; 1131 } 1132 return 0; 1133 } 1134 1135 int VolumeManager::unmountVolume(const char *label, bool force) { 1136 Volume *v = lookupVolume(label); 1137 1138 if (!v) { 1139 errno = ENOENT; 1140 return -1; 1141 } 1142 1143 if (v->getState() == Volume::State_NoMedia) { 1144 errno = ENODEV; 1145 return -1; 1146 } 1147 1148 if (v->getState() != Volume::State_Mounted) { 1149 SLOGW("Attempt to unmount volume which isn't mounted (%d)\n", 1150 v->getState()); 1151 errno = EBUSY; 1152 return -1; 1153 } 1154 1155 cleanupAsec(v, force); 1156 1157 return v->unmountVol(force); 1158 } 1159 1160 /* 1161 * Looks up a volume by it's label or mount-point 1162 */ 1163 Volume *VolumeManager::lookupVolume(const char *label) { 1164 VolumeCollection::iterator i; 1165 1166 for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { 1167 if (label[0] == '/') { 1168 if (!strcmp(label, (*i)->getMountpoint())) 1169 return (*i); 1170 } else { 1171 if (!strcmp(label, (*i)->getLabel())) 1172 return (*i); 1173 } 1174 } 1175 return NULL; 1176 } 1177 1178 bool VolumeManager::isMountpointMounted(const char *mp) 1179 { 1180 char device[256]; 1181 char mount_path[256]; 1182 char rest[256]; 1183 FILE *fp; 1184 char line[1024]; 1185 1186 if (!(fp = fopen("/proc/mounts", "r"))) { 1187 SLOGE("Error opening /proc/mounts (%s)", strerror(errno)); 1188 return false; 1189 } 1190 1191 while(fgets(line, sizeof(line), fp)) { 1192 line[strlen(line)-1] = '\0'; 1193 sscanf(line, "%255s %255s %255s\n", device, mount_path, rest); 1194 if (!strcmp(mount_path, mp)) { 1195 fclose(fp); 1196 return true; 1197 } 1198 } 1199 1200 fclose(fp); 1201 return false; 1202 } 1203 1204 int VolumeManager::cleanupAsec(Volume *v, bool force) { 1205 while(mActiveContainers->size()) { 1206 AsecIdCollection::iterator it = mActiveContainers->begin(); 1207 ContainerData* cd = *it; 1208 SLOGI("Unmounting ASEC %s (dependant on %s)", cd->id, v->getMountpoint()); 1209 if (cd->type == ASEC) { 1210 if (unmountAsec(cd->id, force)) { 1211 SLOGE("Failed to unmount ASEC %s (%s)", cd->id, strerror(errno)); 1212 return -1; 1213 } 1214 } else if (cd->type == OBB) { 1215 if (unmountObb(cd->id, force)) { 1216 SLOGE("Failed to unmount OBB %s (%s)", cd->id, strerror(errno)); 1217 return -1; 1218 } 1219 } else { 1220 SLOGE("Unknown container type %d!", cd->type); 1221 return -1; 1222 } 1223 } 1224 return 0; 1225 } 1226 1227