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 mUsbMassStorageConnected = false; 59 } 60 61 VolumeManager::~VolumeManager() { 62 delete mVolumes; 63 delete mActiveContainers; 64 } 65 66 #define MD5_ASCII_LENGTH ((MD5_DIGEST_LENGTH*2)+1) 67 68 char *VolumeManager::asecHash(const char *id, char *buffer, size_t len) { 69 unsigned char sig[MD5_DIGEST_LENGTH]; 70 71 if (len < MD5_ASCII_LENGTH) { 72 SLOGE("Target hash buffer size < %d bytes (%d)", MD5_ASCII_LENGTH, len); 73 errno = ESPIPE; 74 return NULL; 75 } 76 77 MD5(reinterpret_cast<const unsigned char*>(id), strlen(id), sig); 78 79 memset(buffer, 0, len); 80 81 for (int i = 0; i < MD5_DIGEST_LENGTH; i++) { 82 char tmp[3]; 83 snprintf(tmp, 3, "%.02x", sig[i]); 84 strcat(buffer, tmp); 85 } 86 87 return buffer; 88 } 89 90 void VolumeManager::setDebug(bool enable) { 91 mDebug = enable; 92 VolumeCollection::iterator it; 93 for (it = mVolumes->begin(); it != mVolumes->end(); ++it) { 94 (*it)->setDebug(enable); 95 } 96 } 97 98 int VolumeManager::start() { 99 return 0; 100 } 101 102 int VolumeManager::stop() { 103 return 0; 104 } 105 106 int VolumeManager::addVolume(Volume *v) { 107 mVolumes->push_back(v); 108 return 0; 109 } 110 111 void VolumeManager::notifyUmsConnected(bool connected) { 112 char msg[255]; 113 114 if (connected) { 115 mUsbMassStorageConnected = true; 116 } else { 117 mUsbMassStorageConnected = false; 118 } 119 snprintf(msg, sizeof(msg), "Share method ums now %s", 120 (connected ? "available" : "unavailable")); 121 122 getBroadcaster()->sendBroadcast(ResponseCode::ShareAvailabilityChange, 123 msg, false); 124 } 125 126 void VolumeManager::handleSwitchEvent(NetlinkEvent *evt) { 127 const char *devpath = evt->findParam("DEVPATH"); 128 const char *name = evt->findParam("SWITCH_NAME"); 129 const char *state = evt->findParam("SWITCH_STATE"); 130 131 if (!name || !state) { 132 SLOGW("Switch %s event missing name/state info", devpath); 133 return; 134 } 135 136 if (!strcmp(name, "usb_mass_storage")) { 137 138 if (!strcmp(state, "online")) { 139 notifyUmsConnected(true); 140 } else { 141 notifyUmsConnected(false); 142 } 143 } else { 144 SLOGW("Ignoring unknown switch '%s'", name); 145 } 146 } 147 148 void VolumeManager::handleBlockEvent(NetlinkEvent *evt) { 149 const char *devpath = evt->findParam("DEVPATH"); 150 151 /* Lookup a volume to handle this device */ 152 VolumeCollection::iterator it; 153 bool hit = false; 154 for (it = mVolumes->begin(); it != mVolumes->end(); ++it) { 155 if (!(*it)->handleBlockEvent(evt)) { 156 #ifdef NETLINK_DEBUG 157 SLOGD("Device '%s' event handled by volume %s\n", devpath, (*it)->getLabel()); 158 #endif 159 hit = true; 160 break; 161 } 162 } 163 164 if (!hit) { 165 #ifdef NETLINK_DEBUG 166 SLOGW("No volumes handled block event for '%s'", devpath); 167 #endif 168 } 169 } 170 171 int VolumeManager::listVolumes(SocketClient *cli) { 172 VolumeCollection::iterator i; 173 174 for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { 175 char *buffer; 176 asprintf(&buffer, "%s %s %d", 177 (*i)->getLabel(), (*i)->getMountpoint(), 178 (*i)->getState()); 179 cli->sendMsg(ResponseCode::VolumeListResult, buffer, false); 180 free(buffer); 181 } 182 cli->sendMsg(ResponseCode::CommandOkay, "Volumes listed.", false); 183 return 0; 184 } 185 186 int VolumeManager::formatVolume(const char *label) { 187 Volume *v = lookupVolume(label); 188 189 if (!v) { 190 errno = ENOENT; 191 return -1; 192 } 193 194 return v->formatVol(); 195 } 196 197 int VolumeManager::getAsecMountPath(const char *id, char *buffer, int maxlen) { 198 char asecFileName[255]; 199 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 200 201 memset(buffer, 0, maxlen); 202 if (access(asecFileName, F_OK)) { 203 errno = ENOENT; 204 return -1; 205 } 206 207 snprintf(buffer, maxlen, "%s/%s", Volume::ASECDIR, id); 208 return 0; 209 } 210 211 int VolumeManager::createAsec(const char *id, unsigned int numSectors, 212 const char *fstype, const char *key, int ownerUid) { 213 struct asec_superblock sb; 214 memset(&sb, 0, sizeof(sb)); 215 216 sb.magic = ASEC_SB_MAGIC; 217 sb.ver = ASEC_SB_VER; 218 219 if (numSectors < ((1024*1024)/512)) { 220 SLOGE("Invalid container size specified (%d sectors)", numSectors); 221 errno = EINVAL; 222 return -1; 223 } 224 225 if (lookupVolume(id)) { 226 SLOGE("ASEC id '%s' currently exists", id); 227 errno = EADDRINUSE; 228 return -1; 229 } 230 231 char asecFileName[255]; 232 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 233 234 if (!access(asecFileName, F_OK)) { 235 SLOGE("ASEC file '%s' currently exists - destroy it first! (%s)", 236 asecFileName, strerror(errno)); 237 errno = EADDRINUSE; 238 return -1; 239 } 240 241 /* 242 * Add some headroom 243 */ 244 unsigned fatSize = (((numSectors * 4) / 512) + 1) * 2; 245 unsigned numImgSectors = numSectors + fatSize + 2; 246 247 if (numImgSectors % 63) { 248 numImgSectors += (63 - (numImgSectors % 63)); 249 } 250 251 // Add +1 for our superblock which is at the end 252 if (Loop::createImageFile(asecFileName, numImgSectors + 1)) { 253 SLOGE("ASEC image file creation failed (%s)", strerror(errno)); 254 return -1; 255 } 256 257 char idHash[33]; 258 if (!asecHash(id, idHash, sizeof(idHash))) { 259 SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 260 unlink(asecFileName); 261 return -1; 262 } 263 264 char loopDevice[255]; 265 if (Loop::create(idHash, asecFileName, loopDevice, sizeof(loopDevice))) { 266 SLOGE("ASEC loop device creation failed (%s)", strerror(errno)); 267 unlink(asecFileName); 268 return -1; 269 } 270 271 char dmDevice[255]; 272 bool cleanupDm = false; 273 274 if (strcmp(key, "none")) { 275 // XXX: This is all we support for now 276 sb.c_cipher = ASEC_SB_C_CIPHER_TWOFISH; 277 if (Devmapper::create(idHash, loopDevice, key, numImgSectors, dmDevice, 278 sizeof(dmDevice))) { 279 SLOGE("ASEC device mapping failed (%s)", strerror(errno)); 280 Loop::destroyByDevice(loopDevice); 281 unlink(asecFileName); 282 return -1; 283 } 284 cleanupDm = true; 285 } else { 286 sb.c_cipher = ASEC_SB_C_CIPHER_NONE; 287 strcpy(dmDevice, loopDevice); 288 } 289 290 /* 291 * Drop down the superblock at the end of the file 292 */ 293 294 int sbfd = open(loopDevice, O_RDWR); 295 if (sbfd < 0) { 296 SLOGE("Failed to open new DM device for superblock write (%s)", strerror(errno)); 297 if (cleanupDm) { 298 Devmapper::destroy(idHash); 299 } 300 Loop::destroyByDevice(loopDevice); 301 unlink(asecFileName); 302 return -1; 303 } 304 305 if (lseek(sbfd, (numImgSectors * 512), SEEK_SET) < 0) { 306 close(sbfd); 307 SLOGE("Failed to lseek for superblock (%s)", strerror(errno)); 308 if (cleanupDm) { 309 Devmapper::destroy(idHash); 310 } 311 Loop::destroyByDevice(loopDevice); 312 unlink(asecFileName); 313 return -1; 314 } 315 316 if (write(sbfd, &sb, sizeof(sb)) != sizeof(sb)) { 317 close(sbfd); 318 SLOGE("Failed to write superblock (%s)", strerror(errno)); 319 if (cleanupDm) { 320 Devmapper::destroy(idHash); 321 } 322 Loop::destroyByDevice(loopDevice); 323 unlink(asecFileName); 324 return -1; 325 } 326 close(sbfd); 327 328 if (strcmp(fstype, "none")) { 329 if (strcmp(fstype, "fat")) { 330 SLOGW("Unknown fstype '%s' specified for container", fstype); 331 } 332 333 if (Fat::format(dmDevice, numImgSectors)) { 334 SLOGE("ASEC FAT format failed (%s)", strerror(errno)); 335 if (cleanupDm) { 336 Devmapper::destroy(idHash); 337 } 338 Loop::destroyByDevice(loopDevice); 339 unlink(asecFileName); 340 return -1; 341 } 342 char mountPoint[255]; 343 344 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 345 if (mkdir(mountPoint, 0777)) { 346 if (errno != EEXIST) { 347 SLOGE("Mountpoint creation failed (%s)", strerror(errno)); 348 if (cleanupDm) { 349 Devmapper::destroy(idHash); 350 } 351 Loop::destroyByDevice(loopDevice); 352 unlink(asecFileName); 353 return -1; 354 } 355 } 356 357 if (Fat::doMount(dmDevice, mountPoint, false, false, ownerUid, 358 0, 0000, false)) { 359 SLOGE("ASEC FAT mount failed (%s)", strerror(errno)); 360 if (cleanupDm) { 361 Devmapper::destroy(idHash); 362 } 363 Loop::destroyByDevice(loopDevice); 364 unlink(asecFileName); 365 return -1; 366 } 367 } else { 368 SLOGI("Created raw secure container %s (no filesystem)", id); 369 } 370 371 mActiveContainers->push_back(strdup(id)); 372 return 0; 373 } 374 375 int VolumeManager::finalizeAsec(const char *id) { 376 char asecFileName[255]; 377 char loopDevice[255]; 378 char mountPoint[255]; 379 380 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 381 382 char idHash[33]; 383 if (!asecHash(id, idHash, sizeof(idHash))) { 384 SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 385 return -1; 386 } 387 388 if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 389 SLOGE("Unable to finalize %s (%s)", id, strerror(errno)); 390 return -1; 391 } 392 393 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 394 // XXX: 395 if (Fat::doMount(loopDevice, mountPoint, true, true, 0, 0, 0227, false)) { 396 SLOGE("ASEC finalize mount failed (%s)", strerror(errno)); 397 return -1; 398 } 399 400 if (mDebug) { 401 SLOGD("ASEC %s finalized", id); 402 } 403 return 0; 404 } 405 406 int VolumeManager::renameAsec(const char *id1, const char *id2) { 407 char *asecFilename1; 408 char *asecFilename2; 409 char mountPoint[255]; 410 411 asprintf(&asecFilename1, "%s/%s.asec", Volume::SEC_ASECDIR, id1); 412 asprintf(&asecFilename2, "%s/%s.asec", Volume::SEC_ASECDIR, id2); 413 414 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id1); 415 if (isMountpointMounted(mountPoint)) { 416 SLOGW("Rename attempt when src mounted"); 417 errno = EBUSY; 418 goto out_err; 419 } 420 421 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id2); 422 if (isMountpointMounted(mountPoint)) { 423 SLOGW("Rename attempt when dst mounted"); 424 errno = EBUSY; 425 goto out_err; 426 } 427 428 if (!access(asecFilename2, F_OK)) { 429 SLOGE("Rename attempt when dst exists"); 430 errno = EADDRINUSE; 431 goto out_err; 432 } 433 434 if (rename(asecFilename1, asecFilename2)) { 435 SLOGE("Rename of '%s' to '%s' failed (%s)", asecFilename1, asecFilename2, strerror(errno)); 436 goto out_err; 437 } 438 439 free(asecFilename1); 440 free(asecFilename2); 441 return 0; 442 443 out_err: 444 free(asecFilename1); 445 free(asecFilename2); 446 return -1; 447 } 448 449 #define ASEC_UNMOUNT_RETRIES 5 450 int VolumeManager::unmountAsec(const char *id, bool force) { 451 char asecFileName[255]; 452 char mountPoint[255]; 453 454 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 455 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 456 457 char idHash[33]; 458 if (!asecHash(id, idHash, sizeof(idHash))) { 459 SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 460 return -1; 461 } 462 463 if (!isMountpointMounted(mountPoint)) { 464 SLOGE("Unmount request for ASEC %s when not mounted", id); 465 errno = EINVAL; 466 return -1; 467 } 468 469 int i, rc; 470 for (i = 1; i <= ASEC_UNMOUNT_RETRIES; i++) { 471 rc = umount(mountPoint); 472 if (!rc) { 473 break; 474 } 475 if (rc && (errno == EINVAL || errno == ENOENT)) { 476 SLOGI("Secure container %s unmounted OK", id); 477 rc = 0; 478 break; 479 } 480 SLOGW("ASEC %s unmount attempt %d failed (%s)", 481 id, i, strerror(errno)); 482 483 int action = 0; // default is to just complain 484 485 if (force) { 486 if (i > (ASEC_UNMOUNT_RETRIES - 2)) 487 action = 2; // SIGKILL 488 else if (i > (ASEC_UNMOUNT_RETRIES - 3)) 489 action = 1; // SIGHUP 490 } 491 492 Process::killProcessesWithOpenFiles(mountPoint, action); 493 usleep(1000 * 1000); 494 } 495 496 if (rc) { 497 errno = EBUSY; 498 SLOGE("Failed to unmount container %s (%s)", id, strerror(errno)); 499 return -1; 500 } 501 502 int retries = 10; 503 504 while(retries--) { 505 if (!rmdir(mountPoint)) { 506 break; 507 } 508 509 SLOGW("Failed to rmdir %s (%s)", mountPoint, strerror(errno)); 510 usleep(1000 * 1000); 511 } 512 513 if (!retries) { 514 SLOGE("Timed out trying to rmdir %s (%s)", mountPoint, strerror(errno)); 515 } 516 517 if (Devmapper::destroy(idHash) && errno != ENXIO) { 518 SLOGE("Failed to destroy devmapper instance (%s)", strerror(errno)); 519 } 520 521 char loopDevice[255]; 522 if (!Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 523 Loop::destroyByDevice(loopDevice); 524 } else { 525 SLOGW("Failed to find loop device for {%s} (%s)", asecFileName, strerror(errno)); 526 } 527 528 AsecIdCollection::iterator it; 529 for (it = mActiveContainers->begin(); it != mActiveContainers->end(); ++it) { 530 if (!strcmp(*it, id)) { 531 free(*it); 532 mActiveContainers->erase(it); 533 break; 534 } 535 } 536 if (it == mActiveContainers->end()) { 537 SLOGW("mActiveContainers is inconsistent!"); 538 } 539 return 0; 540 } 541 542 int VolumeManager::destroyAsec(const char *id, bool force) { 543 char asecFileName[255]; 544 char mountPoint[255]; 545 546 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 547 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 548 549 if (isMountpointMounted(mountPoint)) { 550 if (mDebug) { 551 SLOGD("Unmounting container before destroy"); 552 } 553 if (unmountAsec(id, force)) { 554 SLOGE("Failed to unmount asec %s for destroy (%s)", id, strerror(errno)); 555 return -1; 556 } 557 } 558 559 if (unlink(asecFileName)) { 560 SLOGE("Failed to unlink asec '%s' (%s)", asecFileName, strerror(errno)); 561 return -1; 562 } 563 564 if (mDebug) { 565 SLOGD("ASEC %s destroyed", id); 566 } 567 return 0; 568 } 569 570 int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) { 571 char asecFileName[255]; 572 char mountPoint[255]; 573 574 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 575 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 576 577 if (isMountpointMounted(mountPoint)) { 578 SLOGE("ASEC %s already mounted", id); 579 errno = EBUSY; 580 return -1; 581 } 582 583 char idHash[33]; 584 if (!asecHash(id, idHash, sizeof(idHash))) { 585 SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 586 return -1; 587 } 588 589 char loopDevice[255]; 590 if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 591 if (Loop::create(idHash, asecFileName, loopDevice, sizeof(loopDevice))) { 592 SLOGE("ASEC loop device creation failed (%s)", strerror(errno)); 593 return -1; 594 } 595 if (mDebug) { 596 SLOGD("New loop device created at %s", loopDevice); 597 } 598 } else { 599 if (mDebug) { 600 SLOGD("Found active loopback for %s at %s", asecFileName, loopDevice); 601 } 602 } 603 604 char dmDevice[255]; 605 bool cleanupDm = false; 606 int fd; 607 unsigned int nr_sec = 0; 608 609 if ((fd = open(loopDevice, O_RDWR)) < 0) { 610 SLOGE("Failed to open loopdevice (%s)", strerror(errno)); 611 Loop::destroyByDevice(loopDevice); 612 return -1; 613 } 614 615 if (ioctl(fd, BLKGETSIZE, &nr_sec)) { 616 SLOGE("Failed to get loop size (%s)", strerror(errno)); 617 Loop::destroyByDevice(loopDevice); 618 close(fd); 619 return -1; 620 } 621 622 /* 623 * Validate superblock 624 */ 625 struct asec_superblock sb; 626 memset(&sb, 0, sizeof(sb)); 627 if (lseek(fd, ((nr_sec-1) * 512), SEEK_SET) < 0) { 628 SLOGE("lseek failed (%s)", strerror(errno)); 629 close(fd); 630 Loop::destroyByDevice(loopDevice); 631 return -1; 632 } 633 if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) { 634 SLOGE("superblock read failed (%s)", strerror(errno)); 635 close(fd); 636 Loop::destroyByDevice(loopDevice); 637 return -1; 638 } 639 640 close(fd); 641 642 if (mDebug) { 643 SLOGD("Container sb magic/ver (%.8x/%.2x)", sb.magic, sb.ver); 644 } 645 if (sb.magic != ASEC_SB_MAGIC || sb.ver != ASEC_SB_VER) { 646 SLOGE("Bad container magic/version (%.8x/%.2x)", sb.magic, sb.ver); 647 Loop::destroyByDevice(loopDevice); 648 errno = EMEDIUMTYPE; 649 return -1; 650 } 651 nr_sec--; // We don't want the devmapping to extend onto our superblock 652 653 if (strcmp(key, "none")) { 654 if (Devmapper::lookupActive(idHash, dmDevice, sizeof(dmDevice))) { 655 if (Devmapper::create(idHash, loopDevice, key, nr_sec, 656 dmDevice, sizeof(dmDevice))) { 657 SLOGE("ASEC device mapping failed (%s)", strerror(errno)); 658 Loop::destroyByDevice(loopDevice); 659 return -1; 660 } 661 if (mDebug) { 662 SLOGD("New devmapper instance created at %s", dmDevice); 663 } 664 } else { 665 if (mDebug) { 666 SLOGD("Found active devmapper for %s at %s", asecFileName, dmDevice); 667 } 668 } 669 cleanupDm = true; 670 } else { 671 strcpy(dmDevice, loopDevice); 672 } 673 674 if (mkdir(mountPoint, 0777)) { 675 if (errno != EEXIST) { 676 SLOGE("Mountpoint creation failed (%s)", strerror(errno)); 677 if (cleanupDm) { 678 Devmapper::destroy(idHash); 679 } 680 Loop::destroyByDevice(loopDevice); 681 return -1; 682 } 683 } 684 685 if (Fat::doMount(dmDevice, mountPoint, true, false, ownerUid, 0, 686 0222, false)) { 687 // 0227, false)) { 688 SLOGE("ASEC mount failed (%s)", strerror(errno)); 689 if (cleanupDm) { 690 Devmapper::destroy(idHash); 691 } 692 Loop::destroyByDevice(loopDevice); 693 return -1; 694 } 695 696 mActiveContainers->push_back(strdup(id)); 697 if (mDebug) { 698 SLOGD("ASEC %s mounted", id); 699 } 700 return 0; 701 } 702 703 int VolumeManager::mountVolume(const char *label) { 704 Volume *v = lookupVolume(label); 705 706 if (!v) { 707 errno = ENOENT; 708 return -1; 709 } 710 711 return v->mountVol(); 712 } 713 714 int VolumeManager::shareAvailable(const char *method, bool *avail) { 715 716 if (strcmp(method, "ums")) { 717 errno = ENOSYS; 718 return -1; 719 } 720 721 if (mUsbMassStorageConnected) 722 *avail = true; 723 else 724 *avail = false; 725 return 0; 726 } 727 728 int VolumeManager::shareEnabled(const char *label, const char *method, bool *enabled) { 729 Volume *v = lookupVolume(label); 730 731 if (!v) { 732 errno = ENOENT; 733 return -1; 734 } 735 736 if (strcmp(method, "ums")) { 737 errno = ENOSYS; 738 return -1; 739 } 740 741 if (v->getState() != Volume::State_Shared) { 742 *enabled = false; 743 } else { 744 *enabled = true; 745 } 746 return 0; 747 } 748 749 int VolumeManager::simulate(const char *cmd, const char *arg) { 750 751 if (!strcmp(cmd, "ums")) { 752 if (!strcmp(arg, "connect")) { 753 notifyUmsConnected(true); 754 } else if (!strcmp(arg, "disconnect")) { 755 notifyUmsConnected(false); 756 } else { 757 errno = EINVAL; 758 return -1; 759 } 760 } else { 761 errno = EINVAL; 762 return -1; 763 } 764 return 0; 765 } 766 767 int VolumeManager::shareVolume(const char *label, const char *method) { 768 Volume *v = lookupVolume(label); 769 770 if (!v) { 771 errno = ENOENT; 772 return -1; 773 } 774 775 /* 776 * Eventually, we'll want to support additional share back-ends, 777 * some of which may work while the media is mounted. For now, 778 * we just support UMS 779 */ 780 if (strcmp(method, "ums")) { 781 errno = ENOSYS; 782 return -1; 783 } 784 785 if (v->getState() == Volume::State_NoMedia) { 786 errno = ENODEV; 787 return -1; 788 } 789 790 if (v->getState() != Volume::State_Idle) { 791 // You need to unmount manually befoe sharing 792 errno = EBUSY; 793 return -1; 794 } 795 796 dev_t d = v->getDiskDevice(); 797 if ((MAJOR(d) == 0) && (MINOR(d) == 0)) { 798 // This volume does not support raw disk access 799 errno = EINVAL; 800 return -1; 801 } 802 803 int fd; 804 char nodepath[255]; 805 snprintf(nodepath, 806 sizeof(nodepath), "/dev/block/vold/%d:%d", 807 MAJOR(d), MINOR(d)); 808 809 if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", 810 O_WRONLY)) < 0) { 811 SLOGE("Unable to open ums lunfile (%s)", strerror(errno)); 812 return -1; 813 } 814 815 if (write(fd, nodepath, strlen(nodepath)) < 0) { 816 SLOGE("Unable to write to ums lunfile (%s)", strerror(errno)); 817 close(fd); 818 return -1; 819 } 820 821 close(fd); 822 v->handleVolumeShared(); 823 return 0; 824 } 825 826 int VolumeManager::unshareVolume(const char *label, const char *method) { 827 Volume *v = lookupVolume(label); 828 829 if (!v) { 830 errno = ENOENT; 831 return -1; 832 } 833 834 if (strcmp(method, "ums")) { 835 errno = ENOSYS; 836 return -1; 837 } 838 839 if (v->getState() != Volume::State_Shared) { 840 errno = EINVAL; 841 return -1; 842 } 843 844 dev_t d = v->getDiskDevice(); 845 846 int fd; 847 char nodepath[255]; 848 snprintf(nodepath, 849 sizeof(nodepath), "/dev/block/vold/%d:%d", 850 MAJOR(d), MINOR(d)); 851 852 if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) { 853 SLOGE("Unable to open ums lunfile (%s)", strerror(errno)); 854 return -1; 855 } 856 857 char ch = 0; 858 if (write(fd, &ch, 1) < 0) { 859 SLOGE("Unable to write to ums lunfile (%s)", strerror(errno)); 860 close(fd); 861 return -1; 862 } 863 864 close(fd); 865 v->handleVolumeUnshared(); 866 return 0; 867 } 868 869 int VolumeManager::unmountVolume(const char *label, bool force) { 870 Volume *v = lookupVolume(label); 871 872 if (!v) { 873 errno = ENOENT; 874 return -1; 875 } 876 877 if (v->getState() == Volume::State_NoMedia) { 878 errno = ENODEV; 879 return -1; 880 } 881 882 if (v->getState() != Volume::State_Mounted) { 883 SLOGW("Attempt to unmount volume which isn't mounted (%d)\n", 884 v->getState()); 885 errno = EBUSY; 886 return -1; 887 } 888 889 cleanupAsec(v, force); 890 891 return v->unmountVol(force); 892 } 893 894 /* 895 * Looks up a volume by it's label or mount-point 896 */ 897 Volume *VolumeManager::lookupVolume(const char *label) { 898 VolumeCollection::iterator i; 899 900 for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { 901 if (label[0] == '/') { 902 if (!strcmp(label, (*i)->getMountpoint())) 903 return (*i); 904 } else { 905 if (!strcmp(label, (*i)->getLabel())) 906 return (*i); 907 } 908 } 909 return NULL; 910 } 911 912 bool VolumeManager::isMountpointMounted(const char *mp) 913 { 914 char device[256]; 915 char mount_path[256]; 916 char rest[256]; 917 FILE *fp; 918 char line[1024]; 919 920 if (!(fp = fopen("/proc/mounts", "r"))) { 921 SLOGE("Error opening /proc/mounts (%s)", strerror(errno)); 922 return false; 923 } 924 925 while(fgets(line, sizeof(line), fp)) { 926 line[strlen(line)-1] = '\0'; 927 sscanf(line, "%255s %255s %255s\n", device, mount_path, rest); 928 if (!strcmp(mount_path, mp)) { 929 fclose(fp); 930 return true; 931 } 932 } 933 934 fclose(fp); 935 return false; 936 } 937 938 int VolumeManager::cleanupAsec(Volume *v, bool force) { 939 while(mActiveContainers->size()) { 940 AsecIdCollection::iterator it = mActiveContainers->begin(); 941 SLOGI("Unmounting ASEC %s (dependant on %s)", *it, v->getMountpoint()); 942 if (unmountAsec(*it, force)) { 943 SLOGE("Failed to unmount ASEC %s (%s)", *it, strerror(errno)); 944 return -1; 945 } 946 } 947 return 0; 948 } 949 950
