VolumeManager.cpp revision d9a4e358614a0c5f60cc76c0636ee4bb02004a32
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 <cutils/log.h> 31 32#include <sysutils/NetlinkEvent.h> 33 34#include "VolumeManager.h" 35#include "DirectVolume.h" 36#include "ResponseCode.h" 37#include "Loop.h" 38#include "Fat.h" 39#include "Devmapper.h" 40#include "Process.h" 41#include "Asec.h" 42#include "md5.h" 43 44VolumeManager *VolumeManager::sInstance = NULL; 45 46VolumeManager *VolumeManager::Instance() { 47 if (!sInstance) 48 sInstance = new VolumeManager(); 49 return sInstance; 50} 51 52VolumeManager::VolumeManager() { 53 mDebug = false; 54 mBlockDevices = new BlockDeviceCollection(); 55 mVolumes = new VolumeCollection(); 56 mActiveContainers = new AsecIdCollection(); 57 mBroadcaster = NULL; 58 mUsbMassStorageConnected = false; 59} 60 61VolumeManager::~VolumeManager() { 62 delete mBlockDevices; 63 delete mVolumes; 64 delete mActiveContainers; 65} 66 67char *VolumeManager::asecHash(const char *id, char *buffer, size_t len) { 68 MD5_CTX ctx; 69 unsigned char sig[16]; 70 71 if (len < 33) { 72 LOGE("Target hash buffer size < 33 bytes (%d)", len); 73 errno = ESPIPE; 74 return NULL; 75 } 76 MD5_Init(&ctx); 77 MD5_Update(&ctx, id, strlen(id)); 78 MD5_Final(sig, &ctx); 79 80 memset(buffer, 0, len); 81 82 for (int i = 0; i < 16; i++) { 83 char tmp[3]; 84 snprintf(tmp, 3, "%.02x", sig[i]); 85 strcat(buffer, tmp); 86 } 87 88 return buffer; 89} 90 91void VolumeManager::setDebug(bool enable) { 92 mDebug = enable; 93 VolumeCollection::iterator it; 94 for (it = mVolumes->begin(); it != mVolumes->end(); ++it) { 95 (*it)->setDebug(enable); 96 } 97} 98 99int VolumeManager::start() { 100 return 0; 101} 102 103int VolumeManager::stop() { 104 return 0; 105} 106 107int VolumeManager::addVolume(Volume *v) { 108 mVolumes->push_back(v); 109 return 0; 110} 111 112void VolumeManager::notifyUmsConnected(bool connected) { 113 char msg[255]; 114 115 if (connected) { 116 mUsbMassStorageConnected = true; 117 } else { 118 mUsbMassStorageConnected = false; 119 } 120 snprintf(msg, sizeof(msg), "Share method ums now %s", 121 (connected ? "available" : "unavailable")); 122 123 getBroadcaster()->sendBroadcast(ResponseCode::ShareAvailabilityChange, 124 msg, false); 125} 126 127void VolumeManager::handleSwitchEvent(NetlinkEvent *evt) { 128 const char *devpath = evt->findParam("DEVPATH"); 129 const char *name = evt->findParam("SWITCH_NAME"); 130 const char *state = evt->findParam("SWITCH_STATE"); 131 132 if (!name || !state) { 133 LOGW("Switch %s event missing name/state info", devpath); 134 return; 135 } 136 137 if (!strcmp(name, "usb_mass_storage")) { 138 139 if (!strcmp(state, "online")) { 140 notifyUmsConnected(true); 141 } else { 142 notifyUmsConnected(false); 143 } 144 } else { 145 LOGW("Ignoring unknown switch '%s'", name); 146 } 147} 148 149void VolumeManager::handleBlockEvent(NetlinkEvent *evt) { 150 const char *devpath = evt->findParam("DEVPATH"); 151 152 /* Lookup a volume to handle this device */ 153 VolumeCollection::iterator it; 154 bool hit = false; 155 for (it = mVolumes->begin(); it != mVolumes->end(); ++it) { 156 if (!(*it)->handleBlockEvent(evt)) { 157#ifdef NETLINK_DEBUG 158 LOGD("Device '%s' event handled by volume %s\n", devpath, (*it)->getLabel()); 159#endif 160 hit = true; 161 break; 162 } 163 } 164 165 if (!hit) { 166#ifdef NETLINK_DEBUG 167 LOGW("No volumes handled block event for '%s'", devpath); 168#endif 169 } 170} 171 172int VolumeManager::listVolumes(SocketClient *cli) { 173 VolumeCollection::iterator i; 174 175 for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { 176 char *buffer; 177 asprintf(&buffer, "%s %s %d", 178 (*i)->getLabel(), (*i)->getMountpoint(), 179 (*i)->getState()); 180 cli->sendMsg(ResponseCode::VolumeListResult, buffer, false); 181 free(buffer); 182 } 183 cli->sendMsg(ResponseCode::CommandOkay, "Volumes listed.", false); 184 return 0; 185} 186 187int VolumeManager::formatVolume(const char *label) { 188 Volume *v = lookupVolume(label); 189 190 if (!v) { 191 errno = ENOENT; 192 return -1; 193 } 194 195 return v->formatVol(); 196} 197 198int VolumeManager::getAsecMountPath(const char *id, char *buffer, int maxlen) { 199 200 snprintf(buffer, maxlen, "%s/%s", Volume::ASECDIR, id); 201 return 0; 202} 203 204int VolumeManager::createAsec(const char *id, unsigned int numSectors, 205 const char *fstype, const char *key, int ownerUid) { 206 struct asec_superblock sb; 207 memset(&sb, 0, sizeof(sb)); 208 209 sb.magic = ASEC_SB_MAGIC; 210 sb.ver = ASEC_SB_VER; 211 212 if (numSectors < ((1024*1024)/512)) { 213 LOGE("Invalid container size specified (%d sectors)", numSectors); 214 errno = EINVAL; 215 return -1; 216 } 217 218 if (lookupVolume(id)) { 219 LOGE("ASEC id '%s' currently exists", id); 220 errno = EADDRINUSE; 221 return -1; 222 } 223 224 char asecFileName[255]; 225 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 226 227 if (!access(asecFileName, F_OK)) { 228 LOGE("ASEC file '%s' currently exists - destroy it first! (%s)", 229 asecFileName, strerror(errno)); 230 errno = EADDRINUSE; 231 return -1; 232 } 233 234 /* 235 * Add some headroom 236 */ 237 unsigned fatSize = (((numSectors * 4) / 512) + 1) * 2; 238 unsigned numImgSectors = numSectors + fatSize + 2; 239 240 if (numImgSectors % 63) { 241 numImgSectors += (63 - (numImgSectors % 63)); 242 } 243 244 // Add +1 for our superblock which is at the end 245 if (Loop::createImageFile(asecFileName, numImgSectors + 1)) { 246 LOGE("ASEC image file creation failed (%s)", strerror(errno)); 247 return -1; 248 } 249 250 char idHash[33]; 251 if (!asecHash(id, idHash, sizeof(idHash))) { 252 LOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 253 unlink(asecFileName); 254 return -1; 255 } 256 257 char loopDevice[255]; 258 if (Loop::create(idHash, asecFileName, loopDevice, sizeof(loopDevice))) { 259 LOGE("ASEC loop device creation failed (%s)", strerror(errno)); 260 unlink(asecFileName); 261 return -1; 262 } 263 264 char dmDevice[255]; 265 bool cleanupDm = false; 266 267 if (strcmp(key, "none")) { 268 // XXX: This is all we support for now 269 sb.c_cipher = ASEC_SB_C_CIPHER_TWOFISH; 270 if (Devmapper::create(idHash, loopDevice, key, numImgSectors, dmDevice, 271 sizeof(dmDevice))) { 272 LOGE("ASEC device mapping failed (%s)", strerror(errno)); 273 Loop::destroyByDevice(loopDevice); 274 unlink(asecFileName); 275 return -1; 276 } 277 cleanupDm = true; 278 } else { 279 sb.c_cipher = ASEC_SB_C_CIPHER_NONE; 280 strcpy(dmDevice, loopDevice); 281 } 282 283 /* 284 * Drop down the superblock at the end of the file 285 */ 286 287 int sbfd = open(loopDevice, O_RDWR); 288 if (sbfd < 0) { 289 LOGE("Failed to open new DM device for superblock write (%s)", strerror(errno)); 290 if (cleanupDm) { 291 Devmapper::destroy(idHash); 292 } 293 Loop::destroyByDevice(loopDevice); 294 unlink(asecFileName); 295 return -1; 296 } 297 298 if (lseek(sbfd, (numImgSectors * 512), SEEK_SET) < 0) { 299 close(sbfd); 300 LOGE("Failed to lseek for superblock (%s)", strerror(errno)); 301 if (cleanupDm) { 302 Devmapper::destroy(idHash); 303 } 304 Loop::destroyByDevice(loopDevice); 305 unlink(asecFileName); 306 return -1; 307 } 308 309 if (write(sbfd, &sb, sizeof(sb)) != sizeof(sb)) { 310 close(sbfd); 311 LOGE("Failed to write superblock (%s)", strerror(errno)); 312 if (cleanupDm) { 313 Devmapper::destroy(idHash); 314 } 315 Loop::destroyByDevice(loopDevice); 316 unlink(asecFileName); 317 return -1; 318 } 319 close(sbfd); 320 321 if (strcmp(fstype, "none")) { 322 if (strcmp(fstype, "fat")) { 323 LOGW("Unknown fstype '%s' specified for container", fstype); 324 } 325 326 if (Fat::format(dmDevice, numImgSectors)) { 327 LOGE("ASEC FAT format failed (%s)", strerror(errno)); 328 if (cleanupDm) { 329 Devmapper::destroy(idHash); 330 } 331 Loop::destroyByDevice(loopDevice); 332 unlink(asecFileName); 333 return -1; 334 } 335 char mountPoint[255]; 336 337 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 338 if (mkdir(mountPoint, 0777)) { 339 if (errno != EEXIST) { 340 LOGE("Mountpoint creation failed (%s)", strerror(errno)); 341 if (cleanupDm) { 342 Devmapper::destroy(idHash); 343 } 344 Loop::destroyByDevice(loopDevice); 345 unlink(asecFileName); 346 return -1; 347 } 348 } 349 350 if (Fat::doMount(dmDevice, mountPoint, false, false, ownerUid, 351 0, 0000, false)) { 352 LOGE("ASEC FAT mount failed (%s)", strerror(errno)); 353 if (cleanupDm) { 354 Devmapper::destroy(idHash); 355 } 356 Loop::destroyByDevice(loopDevice); 357 unlink(asecFileName); 358 return -1; 359 } 360 } else { 361 LOGI("Created raw secure container %s (no filesystem)", id); 362 } 363 364 mActiveContainers->push_back(strdup(id)); 365 return 0; 366} 367 368int VolumeManager::finalizeAsec(const char *id) { 369 char asecFileName[255]; 370 char loopDevice[255]; 371 char mountPoint[255]; 372 373 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 374 375 char idHash[33]; 376 if (!asecHash(id, idHash, sizeof(idHash))) { 377 LOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 378 return -1; 379 } 380 381 if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 382 LOGE("Unable to finalize %s (%s)", id, strerror(errno)); 383 return -1; 384 } 385 386 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 387 // XXX: 388 if (Fat::doMount(loopDevice, mountPoint, true, true, 0, 0, 0227, false)) { 389 LOGE("ASEC finalize mount failed (%s)", strerror(errno)); 390 return -1; 391 } 392 393 if (mDebug) { 394 LOGD("ASEC %s finalized", id); 395 } 396 return 0; 397} 398 399int VolumeManager::renameAsec(const char *id1, const char *id2) { 400 char *asecFilename1; 401 char *asecFilename2; 402 char mountPoint[255]; 403 404 asprintf(&asecFilename1, "%s/%s.asec", Volume::SEC_ASECDIR, id1); 405 asprintf(&asecFilename2, "%s/%s.asec", Volume::SEC_ASECDIR, id2); 406 407 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id1); 408 if (isMountpointMounted(mountPoint)) { 409 LOGW("Rename attempt when src mounted"); 410 errno = EBUSY; 411 goto out_err; 412 } 413 414 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id2); 415 if (isMountpointMounted(mountPoint)) { 416 LOGW("Rename attempt when dst mounted"); 417 errno = EBUSY; 418 goto out_err; 419 } 420 421 if (!access(asecFilename2, F_OK)) { 422 LOGE("Rename attempt when dst exists"); 423 errno = EADDRINUSE; 424 goto out_err; 425 } 426 427 if (rename(asecFilename1, asecFilename2)) { 428 LOGE("Rename of '%s' to '%s' failed (%s)", asecFilename1, asecFilename2, strerror(errno)); 429 goto out_err; 430 } 431 432 free(asecFilename1); 433 free(asecFilename2); 434 return 0; 435 436out_err: 437 free(asecFilename1); 438 free(asecFilename2); 439 return -1; 440} 441 442#define ASEC_UNMOUNT_RETRIES 5 443int VolumeManager::unmountAsec(const char *id, bool force) { 444 char asecFileName[255]; 445 char mountPoint[255]; 446 447 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 448 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 449 450 char idHash[33]; 451 if (!asecHash(id, idHash, sizeof(idHash))) { 452 LOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 453 return -1; 454 } 455 456 if (!isMountpointMounted(mountPoint)) { 457 LOGE("Unmount request for ASEC %s when not mounted", id); 458 errno = EINVAL; 459 return -1; 460 } 461 462 int i, rc; 463 for (i = 1; i <= ASEC_UNMOUNT_RETRIES; i++) { 464 rc = umount(mountPoint); 465 if (!rc) { 466 break; 467 } 468 if (rc && (errno == EINVAL || errno == ENOENT)) { 469 LOGI("Secure container %s unmounted OK", id); 470 rc = 0; 471 break; 472 } 473 LOGW("ASEC %s unmount attempt %d failed (%s)", 474 id, i, strerror(errno)); 475 476 int action = 0; // default is to just complain 477 478 if (force) { 479 if (i > (ASEC_UNMOUNT_RETRIES - 2)) 480 action = 2; // SIGKILL 481 else if (i > (ASEC_UNMOUNT_RETRIES - 3)) 482 action = 1; // SIGHUP 483 } 484 485 Process::killProcessesWithOpenFiles(mountPoint, action); 486 usleep(1000 * 1000); 487 } 488 489 if (rc) { 490 errno = EBUSY; 491 LOGE("Failed to unmount container %s (%s)", id, strerror(errno)); 492 return -1; 493 } 494 495 int retries = 10; 496 497 while(retries--) { 498 if (!rmdir(mountPoint)) { 499 break; 500 } 501 502 LOGW("Failed to rmdir %s (%s)", mountPoint, strerror(errno)); 503 usleep(1000 * 1000); 504 } 505 506 if (!retries) { 507 LOGE("Timed out trying to rmdir %s (%s)", mountPoint, strerror(errno)); 508 } 509 510 if (Devmapper::destroy(idHash) && errno != ENXIO) { 511 LOGE("Failed to destroy devmapper instance (%s)", strerror(errno)); 512 } 513 514 char loopDevice[255]; 515 if (!Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 516 Loop::destroyByDevice(loopDevice); 517 } else { 518 LOGW("Failed to find loop device for {%s} (%s)", asecFileName, strerror(errno)); 519 } 520 521 AsecIdCollection::iterator it; 522 for (it = mActiveContainers->begin(); it != mActiveContainers->end(); ++it) { 523 if (!strcmp(*it, id)) { 524 free(*it); 525 mActiveContainers->erase(it); 526 break; 527 } 528 } 529 if (it == mActiveContainers->end()) { 530 LOGW("mActiveContainers is inconsistent!"); 531 } 532 return 0; 533} 534 535int VolumeManager::destroyAsec(const char *id, bool force) { 536 char asecFileName[255]; 537 char mountPoint[255]; 538 539 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 540 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 541 542 if (isMountpointMounted(mountPoint)) { 543 if (mDebug) { 544 LOGD("Unmounting container before destroy"); 545 } 546 if (unmountAsec(id, force)) { 547 LOGE("Failed to unmount asec %s for destroy (%s)", id, strerror(errno)); 548 return -1; 549 } 550 } 551 552 if (unlink(asecFileName)) { 553 LOGE("Failed to unlink asec '%s' (%s)", asecFileName, strerror(errno)); 554 return -1; 555 } 556 557 if (mDebug) { 558 LOGD("ASEC %s destroyed", id); 559 } 560 return 0; 561} 562 563int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) { 564 char asecFileName[255]; 565 char mountPoint[255]; 566 567 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 568 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 569 570 if (isMountpointMounted(mountPoint)) { 571 LOGE("ASEC %s already mounted", id); 572 errno = EBUSY; 573 return -1; 574 } 575 576 char idHash[33]; 577 if (!asecHash(id, idHash, sizeof(idHash))) { 578 LOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 579 return -1; 580 } 581 char loopDevice[255]; 582 if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 583 if (Loop::create(idHash, asecFileName, loopDevice, sizeof(loopDevice))) { 584 LOGE("ASEC loop device creation failed (%s)", strerror(errno)); 585 return -1; 586 } 587 if (mDebug) { 588 LOGD("New loop device created at %s", loopDevice); 589 } 590 } else { 591 if (mDebug) { 592 LOGD("Found active loopback for %s at %s", asecFileName, loopDevice); 593 } 594 } 595 596 char dmDevice[255]; 597 bool cleanupDm = false; 598 int fd; 599 unsigned int nr_sec = 0; 600 601 if ((fd = open(loopDevice, O_RDWR)) < 0) { 602 LOGE("Failed to open loopdevice (%s)", strerror(errno)); 603 Loop::destroyByDevice(loopDevice); 604 return -1; 605 } 606 607 if (ioctl(fd, BLKGETSIZE, &nr_sec)) { 608 LOGE("Failed to get loop size (%s)", strerror(errno)); 609 Loop::destroyByDevice(loopDevice); 610 close(fd); 611 return -1; 612 } 613 614 /* 615 * Validate superblock 616 */ 617 struct asec_superblock sb; 618 memset(&sb, 0, sizeof(sb)); 619 if (lseek(fd, ((nr_sec-1) * 512), SEEK_SET) < 0) { 620 LOGE("lseek failed (%s)", strerror(errno)); 621 close(fd); 622 Loop::destroyByDevice(loopDevice); 623 return -1; 624 } 625 if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) { 626 LOGE("superblock read failed (%s)", strerror(errno)); 627 close(fd); 628 Loop::destroyByDevice(loopDevice); 629 return -1; 630 } 631 632 close(fd); 633 634 if (mDebug) { 635 LOGD("Container sb magic/ver (%.8x/%.2x)", sb.magic, sb.ver); 636 } 637 if (sb.magic != ASEC_SB_MAGIC || sb.ver != ASEC_SB_VER) { 638 LOGE("Bad container magic/version (%.8x/%.2x)", sb.magic, sb.ver); 639 Loop::destroyByDevice(loopDevice); 640 errno = EMEDIUMTYPE; 641 return -1; 642 } 643 nr_sec--; // We don't want the devmapping to extend onto our superblock 644 645 if (strcmp(key, "none")) { 646 if (Devmapper::lookupActive(idHash, dmDevice, sizeof(dmDevice))) { 647 if (Devmapper::create(idHash, loopDevice, key, nr_sec, 648 dmDevice, sizeof(dmDevice))) { 649 LOGE("ASEC device mapping failed (%s)", strerror(errno)); 650 Loop::destroyByDevice(loopDevice); 651 return -1; 652 } 653 if (mDebug) { 654 LOGD("New devmapper instance created at %s", dmDevice); 655 } 656 } else { 657 if (mDebug) { 658 LOGD("Found active devmapper for %s at %s", asecFileName, dmDevice); 659 } 660 } 661 cleanupDm = true; 662 } else { 663 strcpy(dmDevice, loopDevice); 664 } 665 666 if (mkdir(mountPoint, 0777)) { 667 if (errno != EEXIST) { 668 LOGE("Mountpoint creation failed (%s)", strerror(errno)); 669 if (cleanupDm) { 670 Devmapper::destroy(idHash); 671 } 672 Loop::destroyByDevice(loopDevice); 673 return -1; 674 } 675 } 676 677 if (Fat::doMount(dmDevice, mountPoint, true, false, ownerUid, 0, 678 0222, false)) { 679// 0227, false)) { 680 LOGE("ASEC mount failed (%s)", strerror(errno)); 681 if (cleanupDm) { 682 Devmapper::destroy(idHash); 683 } 684 Loop::destroyByDevice(loopDevice); 685 return -1; 686 } 687 688 mActiveContainers->push_back(strdup(id)); 689 if (mDebug) { 690 LOGD("ASEC %s mounted", id); 691 } 692 return 0; 693} 694 695int VolumeManager::mountVolume(const char *label) { 696 Volume *v = lookupVolume(label); 697 698 if (!v) { 699 errno = ENOENT; 700 return -1; 701 } 702 703 return v->mountVol(); 704} 705 706int VolumeManager::shareAvailable(const char *method, bool *avail) { 707 708 if (strcmp(method, "ums")) { 709 errno = ENOSYS; 710 return -1; 711 } 712 713 if (mUsbMassStorageConnected) 714 *avail = true; 715 else 716 *avail = false; 717 return 0; 718} 719 720int VolumeManager::shareEnabled(const char *label, const char *method, bool *enabled) { 721 Volume *v = lookupVolume(label); 722 723 if (!v) { 724 errno = ENOENT; 725 return -1; 726 } 727 728 if (strcmp(method, "ums")) { 729 errno = ENOSYS; 730 return -1; 731 } 732 733 if (v->getState() != Volume::State_Shared) { 734 *enabled = false; 735 } else { 736 *enabled = true; 737 } 738 return 0; 739} 740 741int VolumeManager::simulate(const char *cmd, const char *arg) { 742 743 if (!strcmp(cmd, "ums")) { 744 if (!strcmp(arg, "connect")) { 745 notifyUmsConnected(true); 746 } else if (!strcmp(arg, "disconnect")) { 747 notifyUmsConnected(false); 748 } else { 749 errno = EINVAL; 750 return -1; 751 } 752 } else { 753 errno = EINVAL; 754 return -1; 755 } 756 return 0; 757} 758 759int VolumeManager::shareVolume(const char *label, const char *method) { 760 Volume *v = lookupVolume(label); 761 762 if (!v) { 763 errno = ENOENT; 764 return -1; 765 } 766 767 /* 768 * Eventually, we'll want to support additional share back-ends, 769 * some of which may work while the media is mounted. For now, 770 * we just support UMS 771 */ 772 if (strcmp(method, "ums")) { 773 errno = ENOSYS; 774 return -1; 775 } 776 777 if (v->getState() == Volume::State_NoMedia) { 778 errno = ENODEV; 779 return -1; 780 } 781 782 if (v->getState() != Volume::State_Idle) { 783 // You need to unmount manually befoe sharing 784 errno = EBUSY; 785 return -1; 786 } 787 788 dev_t d = v->getDiskDevice(); 789 if ((MAJOR(d) == 0) && (MINOR(d) == 0)) { 790 // This volume does not support raw disk access 791 errno = EINVAL; 792 return -1; 793 } 794 795 int fd; 796 char nodepath[255]; 797 snprintf(nodepath, 798 sizeof(nodepath), "/dev/block/vold/%d:%d", 799 MAJOR(d), MINOR(d)); 800 801 if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", 802 O_WRONLY)) < 0) { 803 LOGE("Unable to open ums lunfile (%s)", strerror(errno)); 804 return -1; 805 } 806 807 if (write(fd, nodepath, strlen(nodepath)) < 0) { 808 LOGE("Unable to write to ums lunfile (%s)", strerror(errno)); 809 close(fd); 810 return -1; 811 } 812 813 close(fd); 814 v->handleVolumeShared(); 815 return 0; 816} 817 818int VolumeManager::unshareVolume(const char *label, const char *method) { 819 Volume *v = lookupVolume(label); 820 821 if (!v) { 822 errno = ENOENT; 823 return -1; 824 } 825 826 if (strcmp(method, "ums")) { 827 errno = ENOSYS; 828 return -1; 829 } 830 831 if (v->getState() != Volume::State_Shared) { 832 errno = EINVAL; 833 return -1; 834 } 835 836 dev_t d = v->getDiskDevice(); 837 838 int fd; 839 char nodepath[255]; 840 snprintf(nodepath, 841 sizeof(nodepath), "/dev/block/vold/%d:%d", 842 MAJOR(d), MINOR(d)); 843 844 if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) { 845 LOGE("Unable to open ums lunfile (%s)", strerror(errno)); 846 return -1; 847 } 848 849 char ch = 0; 850 if (write(fd, &ch, 1) < 0) { 851 LOGE("Unable to write to ums lunfile (%s)", strerror(errno)); 852 close(fd); 853 return -1; 854 } 855 856 close(fd); 857 v->handleVolumeUnshared(); 858 return 0; 859} 860 861int VolumeManager::unmountVolume(const char *label, bool force) { 862 Volume *v = lookupVolume(label); 863 864 if (!v) { 865 errno = ENOENT; 866 return -1; 867 } 868 869 if (v->getState() == Volume::State_NoMedia) { 870 errno = ENODEV; 871 return -1; 872 } 873 874 if (v->getState() != Volume::State_Mounted) { 875 LOGW("Attempt to unmount volume which isn't mounted (%d)\n", 876 v->getState()); 877 errno = EBUSY; 878 return -1; 879 } 880 881 while(mActiveContainers->size()) { 882 AsecIdCollection::iterator it = mActiveContainers->begin(); 883 LOGI("Unmounting ASEC %s (dependant on %s)", *it, v->getMountpoint()); 884 if (unmountAsec(*it, force)) { 885 LOGE("Failed to unmount ASEC %s (%s)", *it, strerror(errno)); 886 return -1; 887 } 888 } 889 890 return v->unmountVol(force); 891} 892 893/* 894 * Looks up a volume by it's label or mount-point 895 */ 896Volume *VolumeManager::lookupVolume(const char *label) { 897 VolumeCollection::iterator i; 898 899 for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { 900 if (label[0] == '/') { 901 if (!strcmp(label, (*i)->getMountpoint())) 902 return (*i); 903 } else { 904 if (!strcmp(label, (*i)->getLabel())) 905 return (*i); 906 } 907 } 908 return NULL; 909} 910 911bool VolumeManager::isMountpointMounted(const char *mp) 912{ 913 char device[256]; 914 char mount_path[256]; 915 char rest[256]; 916 FILE *fp; 917 char line[1024]; 918 919 if (!(fp = fopen("/proc/mounts", "r"))) { 920 LOGE("Error opening /proc/mounts (%s)", strerror(errno)); 921 return false; 922 } 923 924 while(fgets(line, sizeof(line), fp)) { 925 line[strlen(line)-1] = '\0'; 926 sscanf(line, "%255s %255s %255s\n", device, mount_path, rest); 927 if (!strcmp(mount_path, mp)) { 928 fclose(fp); 929 return true; 930 } 931 932 } 933 934 fclose(fp); 935 return false; 936} 937 938